阅读说明：本技术 一种电子膨胀阀 (Electronic expansion valve ) 是由 不公告发明人 于 2020-05-19 设计创作，主要内容包括：一种电子膨胀阀,其特征在于,包括阀体部件、螺母部件、丝杆以及阀针,所述阀体部件具有阀口部,所述丝杆包括丝杆螺纹部,所述螺母部件包括螺母螺纹部,所述丝杆螺纹部与所述螺母螺纹部螺纹配合,所述阀针包括阀针导向部,所述阀体部件还包括阀体导向部,所述阀针导向部与所述阀体导向部滑动配合,所述阀针能够接近或远离所述阀口部,所述丝杆包括支撑部,所述阀针还包括悬挂部,所述支撑部相对所述悬挂部更靠近所述阀口部,所述支撑部能够与所述悬挂部相抵。(The utility model provides an electronic expansion valve, its characterized in that, includes valve body part, nut part, lead screw and needle, the valve body part has the valve opening portion, the lead screw includes lead screw thread portion, nut part includes nut screw thread portion, lead screw thread portion with nut screw thread portion screw-thread fit, the needle includes the needle guide part, the valve body part still includes the valve body guide part, the needle guide part with valve body guide part sliding fit, the needle can be close or keep away from the valve opening portion, the lead screw includes the supporting part, the needle still includes the suspension portion, the supporting part is relative the suspension portion is closer to the valve opening portion, the supporting part can with the suspension portion offsets.)

1. The utility model provides an electronic expansion valve, its characterized in that, includes valve body part, nut part, lead screw and needle, the valve body part has the valve opening portion, the lead screw includes lead screw thread portion, nut part includes nut screw thread portion, lead screw thread portion with nut screw thread portion screw-thread fit, the needle includes the needle guide part, the valve body part still includes the valve body guide part, the needle guide part with valve body guide part sliding fit, the needle can be close or keep away from the valve opening portion, the lead screw includes the supporting part, the needle still includes the suspension portion, the supporting part is relative the suspension portion is closer to the valve opening portion, the supporting part can with the suspension portion offsets.

2. The electronic expansion valve according to claim 1, wherein the lead screw includes a lead screw guide portion closer to the valve port portion than the lead screw threaded portion, the nut includes a nut guide portion in sliding guide fit or clearance fit with the nut guide portion, the lead screw has a first accommodation portion and a lead screw notch, the valve needle is inserted into the first accommodation portion, the lead screw has a lead screw end surface, the support portion includes a first support portion, the valve needle includes a valve needle abutment portion and a valve needle recess portion, the suspension portion includes a first suspension portion, the valve needle recess portion is located between the valve needle guide portion and the first suspension portion, the valve needle is inserted into the first accommodation portion through the lead screw notch, the first suspension portion is capable of abutting against the first support portion in at least one radial direction, the screw rod and the valve needle are not provided with structures capable of preventing the screw rod and the valve needle from being separated from each other.

3. The electronic expansion valve according to claim 2, wherein the first supporting portion is closer to the valve opening portion than the first suspension portion, the valve needle has a valve needle receiving groove, the valve needle receiving groove is substantially recessed from an end surface of the first suspension portion, the electronic expansion valve further comprises a steel ball, a portion of the steel ball is located in the valve needle receiving groove, a diameter of the steel ball is smaller than a distance between a groove bottom of the valve needle receiving groove and the end surface of the screw rod, the steel ball is capable of rotating freely, and the valve needle receiving groove is provided with grease.

4. The electronic expansion valve according to claim 2 or 3, wherein the first supporting portion includes at least a protrusion extending radially from a lower end position of the screw rod toward the valve port portion, and the first suspension portion includes at least a protrusion extending radially from an upper end position of the valve needle toward the valve needle center axis, and the first supporting portion is integrated with the screw rod, or the first supporting portion is fixedly connected or position-limited with the screw rod, or the first suspension portion is integrated with the valve needle, or the first suspension portion is fixedly connected or position-limited with the valve needle.

5. The electronic expansion valve according to claim 1, wherein the valve needle portion comprises a second valve needle guide portion, the second valve needle guide portion is farther from the valve port portion than the valve needle guide portion, the nut comprises a nut guide portion, the second valve needle guide portion is in sliding guide fit or clearance fit with the nut guide portion, the valve needle has a second accommodation portion and a valve needle notch, the screw rod is inserted into the second accommodation portion, the screw rod further comprises a screw rod recess and a connection portion, the support portion comprises a second support portion, the screw rod recess is located between the second support portion and the connection portion, the suspension portion comprises a second suspension portion, the screw rod is inserted into the second accommodation portion through the valve needle notch, the second support portion is closer to the valve port portion than the second suspension portion, and the second support portion can abut against the second suspension portion, in at least one radial direction, the screw and the valve needle are not provided with structures capable of preventing the screw and the valve needle from being disengaged from each other.

6. The electronic expansion valve according to claim 5, wherein the second support portion comprises a lower support end surface and an upper support end surface, the electronic expansion valve comprises a steel ball, the lower support end surface has a gap with the steel ball when the valve needle is not abutted against the valve orifice portion, and the upper support end surface is abutted against the second suspension portion; when the lower support end face abuts against the steel ball, the valve needle abuts against the valve port, and a gap is formed between the upper support end face and the second suspension portion.

7. The electronic expansion valve according to claim 5 or 6, wherein the second support portion is a radial protrusion extending from a lower end position of the screw rod toward a direction away from the central axis of the screw rod, the second suspension portion is a radial protrusion extending from an upper end position of the valve needle toward a direction toward the central axis of the valve needle, the second support portion is integrated with the screw rod, or the second support portion is fixedly or limitedly connected to the screw rod, the second suspension portion is integrated with the second valve needle, or the second suspension portion is fixedly or limitedly connected to the second valve needle.

8. The electronic expansion valve according to claim 2 or 5, wherein the screw has a screw-receiving groove, the screw has a screw end surface, the screw-receiving groove is recessed inward from the screw end surface, the electronic expansion valve further comprises a steel ball, a part of the steel ball is located in the screw-receiving groove, the screw clamps the steel ball by riveting deformation, and the steel ball can abut against the valve needle.

9. The electronic expansion valve according to claim 1, wherein the valve needle comprises a first abutting portion having a gap with the lead screw when the valve needle is not abutted against the valve port portion, and the support portion is abutted against the suspension portion; when the first abutting part abuts against the screw rod, the valve needle abuts against the valve port part, and a gap is formed between the supporting part and the hanging part;

or the screw rod comprises a second abutting part, when the valve needle is not abutted against the valve port part, a gap is formed between the second abutting part and the valve needle, and the supporting part is abutted against the suspension part; when the second abutting part abuts against the valve needle, the valve needle abuts against the valve port part, and the supporting part and the hanging part have a gap;

or the valve needle comprises the first abutting part, the screw rod comprises the second abutting part, when the valve needle abuts against the valve opening part, a gap is formed between the first abutting part and the second abutting part, and the supporting part abuts against the suspension part; when the first abutting part abuts against the second abutting part, the valve needle abuts against the valve port part, and the supporting part and the hanging part have a gap.

10. The electronic expansion valve according to claim 9, wherein the first abutting portion is integrated with the valve needle, or is fixedly connected or bonded to the valve needle, the first abutting portion is substantially convex in a direction away from the valve port, the first abutting portion is substantially hemispherical, arcuate, or angular, and the first abutting portion can abut against the screw rod.

11. The electronic expansion valve according to claim 9, wherein the second abutting portion is integrated with the lead screw, or is fixedly connected or bonded to the lead screw in a limiting manner, the second abutting portion is substantially convex from the lead screw toward the valve port, the second abutting portion is substantially hemispherical, arc-shaped or angular, and the second abutting portion can abut against the valve needle.

12. The electronic expansion valve of claim 1, wherein the lead screw has a first slot, the support comprises a first support, the suspension comprises a first suspension portion, the first suspension portion comprises an upper suspension end surface and a lower suspension end surface, the valve needle extends into the lead screw substantially radially through the first slot, the first support abuts the first suspension portion when the valve needle is not abutting the valve port portion, the lower suspension end surface has a gap with the first suspension portion when the valve needle is abutting the valve port portion, the upper suspension end surface has a gap with the lead screw; or the valve needle is provided with a second notch, the support part comprises a second support part, the suspension part comprises a second suspension part, the second support part comprises an upper support end surface and a lower support end surface, when the valve needle is not abutted to the valve port part, the second support part is abutted to the second suspension part, when the valve needle is abutted to the valve port part, the upper support end surface is provided with a gap with the second suspension part, and the lower support end surface is provided with a gap with the valve needle.

[ technical field ] A method for producing a semiconductor device

The invention relates to the technical field of refrigeration control, in particular to an electronic expansion valve.

[ background of the invention ]

The electronic expansion valve comprises a valve body, a nut component and a screw rod valve needle component, wherein the valve body is provided with a valve port, the nut component is fixedly connected with the valve body, the screw rod valve needle component comprises a screw rod and a valve needle, the screw rod is in threaded fit with the nut component, the valve needle can perform axial lifting motion to be close to or far away from the valve port under the action of coil excitation and thread fit transmission, the valve needle is affected by part processing deviation or actuation and the like, and when the screw rod is deflected, the valve needle can be affected by the screw rod to have the condition that the valve port is deflected relatively.

[ summary of the invention ]

The invention aims to provide an electronic expansion valve with a novel structure, which relatively reduces the influence of the actuation of a screw rod on a valve needle and the deflection of a valve port.

The invention provides an electronic expansion valve which comprises a valve body part, a nut part, a screw rod and a valve needle, wherein the valve body part is provided with a valve opening part, the screw rod comprises a screw rod thread part, the nut part comprises a nut thread part, the screw rod thread part is in thread fit with the screw nut thread part, the valve needle comprises a valve needle guide part, the valve body part further comprises a valve body guide part, the valve needle guide part is in sliding fit with the valve body guide part, the valve needle can approach or be far away from the valve opening part, the screw rod comprises a support part, the valve needle further comprises a suspension part, the support part is closer to the valve opening part relative to the suspension part, and the support part can abut against the suspension part.

According to the invention, through the optimized design of the structure of the electronic expansion valve, the screw rod comprises the supporting part, the valve needle comprises the valve needle guiding part and the hanging part, the valve needle guiding part is in sliding fit with the valve body guiding part, the support can be abutted against the hanging part, and the situation that the valve needle is influenced by the screw rod and the valve port is inclined can be relatively reduced.

[ description of the drawings ]

Fig. 1 is a sectional view of the overall structure of a first embodiment of an electronic expansion valve provided by the present invention (the valve needle is relatively far away from the valve port);

FIG. 2 is a cross-sectional view of the nut member of FIG. 1 in cooperation with a lead screw and a valve pin;

fig. 3 is a schematic perspective view of a screw and a valve needle structure of a first embodiment of an electronic expansion valve provided in the present invention;

fig. 4 is a cross-sectional view of the overall structure of a first embodiment of the electronic expansion valve provided by the present invention (the valve needle is in contact with the valve port);

fig. 5 is a sectional view of a screw and valve needle matching structure of the first embodiment of the electronic expansion valve of fig. 4;

fig. 6 is another structural schematic view of the first abutment portion integrally formed with the valve needle according to the present invention;

fig. 7 is a schematic structural view of a second abutting portion provided on the screw rod according to the present invention;

fig. 8 is another schematic structural view of the second abutting portion integrally provided with the screw rod according to the present invention;

fig. 9 is a perspective view of a valve needle structure of a second embodiment of the electronic expansion valve provided by the present invention;

fig. 10 is a perspective view of a valve needle and screw rod matching structure of a second embodiment of the electronic expansion valve provided by the invention;

fig. 11 is a sectional view of a connection structure of a valve needle and a screw of a second embodiment of the electronic expansion valve provided in the present invention;

fig. 12 is a schematic view showing the overall structure of a second embodiment of an electronic expansion valve to which the structure of fig. 11 is applied (a state in which a valve needle is not abutted against a valve port portion);

fig. 13 is a schematic view showing the overall structure of a second embodiment of an electronic expansion valve to which the structure of fig. 11 is applied (a state in which a valve needle abuts a valve port);

fig. 14 is a schematic view of an overall structure of the electronic expansion valve provided by the present application, in which no steel ball is disposed between the screw rod and the valve needle (the valve needle is in contact with the valve port);

FIG. 15 is a perspective side view of the lead screw of FIG. 14, a perspective view of the lead screw and the valve pin structure;

FIG. 16 is another schematic structural diagram of an electronic expansion valve provided in the present application, in which no steel ball is disposed between the screw rod and the valve needle

[ detailed description ] embodiments

It should be noted that, the present invention emphasizes the connection relationship between the protective valve needle and the screw rod, and the matching relationship between the valve needle and the screw rod, the nut and the valve body, and the structure of other structures of the electronic expansion valve, such as the rotor component, the coil component, etc., can be adjusted according to the system or other needs and according to the occasion.

The application provides an electronic expansion valve, including valve body part 10, nut part 50, feed screw 60 and valve needle 70, valve body part 10 has valve port 11 and valve body guide part 13, valve port 11 has valve port 110, valve body part 10 can be integrated into one piece through lathing etc., can also make up fixed connection after valve port 11 and/or guide part 13 separate body arrangement, for example can make valve port 11 and valve body part 10 separate body arrangement and then make them fixed connection, valve port 11 refers to the part where valve port 110 locates, guide part 13 can be an integrated structure with valve body part 10, can separate body arrangement, as an independent spare part processing and then make fixed connection with valve body part 10, guide part 13 has a guide hole, when the electronic expansion valve is totally closed and has no flow regulation, can set valve needle 70 close to or far away from valve port 11, the valve needle can be abutted against the valve port 11, and the refrigerant can not flow out from the valve port 110 to the longitudinal connecting pipe after entering the valve cavity from the transverse connecting pipe.

The nut member 50 can be fixedly connected with the valve body member 10, the screw mandrel 60 comprises a screw mandrel thread part 61, the nut member 50 comprises a nut thread part 53 and a nut guide part 54, the screw mandrel thread part 61 is in threaded fit with the nut thread part 53, the screw mandrel 60 further comprises a support part 621, a suspension part 721 of the valve needle 70, the valve needle guide part 72 is in sliding fit with the valve body guide part 13 of the valve body member 10, the valve needle 70 can perform lifting movement in the axial direction to be close to or far away from the valve port 110, the support part 621 is closer to the valve port 11 than the suspension part 721, and the support part 621 can be abutted against the suspension part 721, the screw mandrel 60 can drive the valve needle 70 to move in the direction far away from the valve port 11, and through the optimized design of the valve needle and the screw mandrel structure and the matching structure, when the electronic expansion valve is actuated, the valve needle 70 can be self-guided to be in sliding fit with the valve body guide part 13 of the valve body member 10 as an independent component, the influence of the screw rod actuation is greatly reduced, the valve needle has larger relevance with the screw rod only when the screw rod is actuated upwards in the axial direction, when the screw rod deflects relative to the valve port 110 due to machining tolerance or actuation environment influence, the valve needle 70 is less influenced by the deflection of the screw rod to deflect relative to the valve port 110, the coaxiality of the valve needle 70 and the valve port 110 can be ensured, and the valve actuation reliability is relatively ensured.

It should be noted that the valve body guiding portion 13 stated in the present application indicates that the valve body component may include a guiding section capable of sliding fit with the valve needle to provide guiding function for the valve needle, and is not necessarily a complete solid guiding component formed on the inner peripheral portion of the valve body component; also, the valve needle guide portion may refer to a valve needle including a guide section capable of sliding engagement with the valve body guide portion, and may not necessarily be a complete solid guide member formed on the outer peripheral portion of the valve needle.

Referring to fig. 1-8 of the specification, a first embodiment provided in the present application will be described in detail, as shown in fig. 1, an electronic expansion valve includes a valve body 10, a connecting seat 20, and a housing 30, the connecting seat 20 is fixedly connected to the valve body 10, the housing 30 is fixedly connected to the connecting seat 20, the connecting seat 20 and the valve body 10 can be formed as an integral structure, the valve body 10, the connecting seat 20, and the housing 30 substantially define a valve cavity of the electronic expansion valve, the valve cavity accommodates a rotor component 40, a partial nut component 50, and a partial screw 60, the rotor component 40 includes a rotor and a rotor seat 42, the rotor and the rotor seat 42 are formed by injection molding, the screw 60 includes an external thread portion 61, a screw guide portion 62, and a screw abutting portion 63, the screw 60 rotates with the rotor, the screw abutting portion 63 is located above the external thread portion 61, the screw guide portion 62 is located below the external thread portion 61, the screw abutting portion 63 is substantially in a smooth section structure, an end portion of the screw abutting portion 63 can be arranged in a spherical structure to be capable of abutting against the housing 30, and the screw abutting portion 63 is in sliding fit with the rotor seat 42.

As shown in fig. 1 and 2, the nut member 50 includes a nut body 51 and a connecting portion 52, the nut body 51 has an internal thread portion 53, the internal thread portion 53 is screwed with the external thread portion 61, the external thread portion 61 of the lead screw 60 and the internal thread portion 53 of the nut are always in a full-thread state in both an open state and a closed state, when the valve is in the full-open state, teeth of a part of the external thread portion 61 are engaged with the internal thread portion 53, teeth of another part of the external thread portion 61 are positioned above the internal thread portion 53, teeth of another part of the external thread portion 61 are positioned below the internal thread portion 53, so that wear of the lead screw on the teeth of the nut member 50 during operation can be relatively reduced, the service life of the components can be prolonged, the nut member 50 can be an injection molded plastic member, the nut body 51 is a plastic member, the connecting portion 52 is a metal material, and the nut body 51 and the connecting portion 52 are insert molded, the connecting portion 52 is fixedly connected to the valve body 10 so that the nut member 50 is integrally fixed to the valve body 10, or the nut member 50 may be integrally formed of a metal material, the nut member 50 is directly fixedly connected to the valve body 10, the nut 50 has a nut guide hole, and further includes a nut guide portion 54, the nut guide portion 54 is located below a threaded portion of the nut, i.e., an internal threaded portion 53, an inner diameter of the nut guide hole is larger than an inner diameter of the internal threaded portion, the nut guide portion has a substantially smooth-segment structure, the spindle guide portion 62 and a portion of the needle 70 may be located in the nut guide hole, the spindle guide portion 62 is slidably guided or clearance-fitted to the nut guide portion 54, a portion of the needle 70 may be slidably fitted to the nut guide portion 54, the valve body 10 further includes a valve body guide portion 13, the needle guide portion 72 of the needle 70 is slidably fitted to the valve body guide portion 13, it should be noted that it is not excluded that the needle portion 70 may extend into the nut guide hole and the nut guide portion 54 to be slidably fitted to the nut guide portion 54 Close or clearance fit, for example, a part of the valve needle guide part 72 extends into the nut guide hole and can be in sliding guide fit or clearance fit with the nut guide part 54, the screw rod 60 can abut against the valve needle 70, through the excitation of the coil component, when the valve opening action is required, the screw rod 60 can lift the valve needle 70 axially upwards to gradually get away from the valve port 110, when the valve closing action is required, the screw rod 60 moves axially downwards together with the valve needle 70, and the valve needle 70 can approach or get away from the valve port 110 to regulate the flow rate of the refrigerant flowing through the valve port.

As shown in fig. 3, the screw 60 can be integrally formed by machining, and can be made of stainless steel material, so as to facilitate the assembly, the screw 60 includes a screw guide 62 and a support 621, the screw 60 has a first accommodating portion 623 and a screw notch 622, the support 621 of the first embodiment provided by the present application includes at least a protrusion extending from a lower end position of the screw in a direction close to the valve port portion 11 in a radial direction toward a central axis of the screw, specifically, the support 621 includes a first support 621a, the needle 70 is inserted into the first accommodating portion 623, the first support 621a is a hook-shaped portion extending from the screw guide 62 in a radial direction toward a central axis of the screw, the needle 70 includes a needle abutment portion capable of abutting against the valve port portion 11 and a needle recess 74, the suspension 721 of the first embodiment provided by the present application includes at least a protrusion extending from an upper end position of the needle in a radial direction away from the central axis of the needle in a direction away from the valve port portion 11, specifically, the suspension portion 721 includes a first suspension portion 721a, the valve needle recess 74 is located between the first suspension portion 721a and the valve needle guide portion 72, the valve needle can radially extend into the first accommodating portion 623 through the lead screw notch 622, the valve needle 70 can rotate freely with respect to the lead screw 60 as a whole, the first suspension portion 721a is located in the first accommodating portion, the first support portion 621a can abut against the first suspension portion 721a, the first support portion 621a and the lead screw guide portion 62 can be integrated into a whole, the first support portion 621a can be fixed or limited or bonded after being separately disposed with the lead screw guide portion 62, the first support portion 621a can be disposed in a retaining ring structure, for example, the retaining ring structure utilizes the expansion force of the retaining ring to achieve fixed or limited connection with the lead screw guide portion 62, or the first support portion 621 can be disposed in a snap spring or latch structure, a snap groove corresponding to the snap spring or a mounting hole corresponding to the latch is disposed on the lead screw guide portion 62, the clamp spring is clamped and limited with the clamp groove, the bolt is limited and connected with the mounting hole, the first supporting part 621a at least comprises a convex part which is approximately extended along the radial direction by the screw rod guide part 62, the whole first supporting part 621a can be approximately in a vertical intersection structure with the screw rod 60 or an included angle is formed between the first supporting part 621a and the screw rod 60 and is integrally in an inclined structure, the valve needle can be used as a relatively independent part through the optimized arrangement of the valve needle and the screw rod structure and the matching structure of the valve needle and the screw rod structure, the valve needle can be guided automatically, the valve needle has larger relevance with the screw rod only when moving axially upwards, when the valve needle is influenced by the processing tolerance or the actuating environment of the part, when the screw rod is actuated and relatively deflected, the valve needle is slightly influenced by the screw rod, the coaxiality of a valve port and the valve port can still be kept, and the actuating reliability of the valve is relatively ensured, .

Further, the needle 70 has a needle receiving groove 73, the needle 70 includes a needle guide portion 72, a suspending portion 721, a needle abutting portion, and a needle recess 74, in this embodiment, the suspending portion 721 includes a first suspending portion 721a substantially in the form of a convex portion extending from the needle recess 74 in the radial direction toward the circumferential direction, the needle receiving groove 73 is formed by an end surface of the first suspending portion 721a being recessed inward, an outer diameter of the first suspending portion 721a is larger than an inner diameter of the first supporting portion 621a so that the first suspending portion 721a is supported on the first supporting portion 621a, the first supporting portion 621a is located below the first suspending portion 721a, and the first supporting portion 621a is closer to the valve opening portion 11 than the first suspending portion 721a, the first suspending portion 721a is integrated with the needle guide portion 72, or the first suspending portion 721a may be separately provided with the needle guide portion 72 and then be fixedly connected or bonded, referring to the arrangement of the first supporting portion 621a, the first hanging portion 721a may be configured as a retaining ring structure or a snap spring or a latch, for example, the first hanging portion 721a includes at least a protrusion extending from the valve needle recess 74 to the periphery in a radial direction, the first hanging portion 721a may be configured to form a substantially vertical intersection with the valve needle 70 or the first hanging portion 721a and the valve needle 70 may be configured to be inclined as a whole, only the first hanging portion 721a can be ensured to be abutted against the first supporting portion 621a, the valve needle receiving groove 73 is formed by an end surface of the first hanging portion 721a being recessed inwards, the valve needle 70 may be inserted into the first receiving portion 623 through the screw rod notch 622 in a free insertion manner as a whole, in at least one radial direction, the screw rod and the valve needle are not provided with a structure capable of preventing the screw rod from being disengaged from the valve needle, and the valve needle may be inserted into the first receiving portion 623 of the screw rod in a substantially radial direction, after the installation, the nut guide portion 54 of the nut member 50 roughly limits the screw and the valve needle in the radial direction, so that the valve needle can be prevented from being separated from the screw, the connection structure of the valve needle and the screw is relatively convenient and reliable, and the installation mode is simpler.

It should be noted that the radial direction stated in the specification of the present application includes a radial direction extending in a horizontal direction and also includes a radial direction extending in a substantially inclined direction, and it should be noted that the needle or the needle member stated in the present application may be an integral structure formed by machining or the like, or may be a needle assembly or a lead screw assembly formed by assembling a plurality of parts, for example, the lead screw guide portion 62 and the first support portion 621 of the lead screw 60 may be separately provided and processed, and then assembled to form the lead screw assembly 60.

The first suspension portion 721a is located in the first accommodating portion 623, the first suspension portion 721a can abut against the first supporting portion 621a, the screw 60 and the valve needle 70 are connected in a suspension and support manner similar to a hook manner, the position where the first suspension portion 721a abuts against the first supporting portion 621a is defined as a first abutting position a, the electronic expansion valve further includes a steel ball 80, the steel ball 80 is located in the valve needle accommodating groove 73, the overall shape of the valve needle accommodating groove 73 is adapted to the steel ball 80, the screw 60 further includes a screw end surface 64, the diameter of the steel ball 80 is smaller than the distance between the groove bottom of the valve needle accommodating groove 73 and the screw end surface 64, the steel ball 80 can be ensured to be freely rotated, the valve needle 70 can be freely rotated integrally relative to the screw 60, as shown in fig. 5, when the valve needle abutting portion of the valve needle 70 does not abut against the valve port 11, the distance between the screw end surface 64 and the first abutting position a is set as L1, the distance between the spherical end of the steel ball 80 and the first abutting position A is L2, wherein L1-L2 is more than 0, namely a gap L3 is arranged between the spherical end surface of the steel ball 80 and the end surface 64 of the screw rod, and L3 is more than 0.

Referring to fig. 1 and 4, the operation principle of the electronic expansion valve according to the first embodiment of the present invention is described in detail, the rotor rotates under the influence of the excitation of the coil component, the rotor seat 42 and the lead screw 60 also rotate synchronously, the lead screw 60 moves axially and downwardly together with the valve needle 70 through the screw-thread cooperation action of the lead screw 60 and the nut 50, the valve needle 70 gradually approaches the valve port 110, when the valve needle 70 is not abutted against the valve port 11, the steel ball 80 has a gap L3 with the lead screw end surface 64 of the lead screw 60, and the first supporting portion 621a abuts against the first suspending portion 721a, because of the existence of the gap L3, the lead screw 60 can still continue to move downwardly, the lead screw 60 continues to move downwardly to eliminate the gap L3 between the steel ball 80 and the lead screw end surface 64, when the steel ball 80 abuts against the lead screw 60, the valve needle 70 is driven downwardly by the rotational driving force of the lead screw 60, and the valve needle 70 abuts against the valve port 11 and is in an abutting state, and the clearance L3 between the steel ball 80 and the end surface 64 of the screw rod is transferred between the first supporting part 621a and the first suspension part 721a, at this time, the first supporting part 621a and the first suspension part 721a have a clearance L3', and the screw rod 60 forms a stopping state under resistance due to the reverse acting force of the steel ball 80, and does not move downwards, so as to form a lower stopping structure of the electronic expansion valve, when the steel ball 80 abuts against the end surface 64 of the screw rod, the valve needle abuts against the valve port part and is in an abutting state due to the driving force of the screw rod, through the optimized arrangement of the screw rod and the valve needle structure of the electronic expansion valve, the valve needle directly abuts against the screw rod to realize suspension support connection, and the valve needle and the screw rod are associated through the rolling piece steel ball 80, when in actuation, even if the screw rod 60 rotates, the acting force applied to the valve needle 70 can be greatly reduced, and the torsion transmitted downwards when the screw rod rotates is reduced, thereby reducing the influence of the deflection of the screw rod on the valve needle, reducing the phenomena of heating and dry friction caused by the same point being stressed for a long time, greatly reducing the friction force, reducing the abrasion of the valve needle to the valve port caused by the rotation of the screw rod and reducing the loss of the driving force in the downward transmission process, further adding grease into the valve needle accommodating groove 73, reducing the hidden trouble of noise caused by the movement of the steel ball 80 caused by the adhesion of the grease in the actuation process of the electronic expansion valve, realizing the suspension support connection by directly abutting the valve needle and the screw rod, sliding matching of part of the valve needle 70 and the valve body part 10, enabling the valve needle to freely move in a certain clearance after the screw rod is assembled, having little influence of the assembly accumulated coaxiality of the screw rod 60, the nut 50 and other parts, and having good sealing effect with the valve port part 11, and the clearance between the steel ball 80 and the screw rod is small, the valve opening pulse deviation is extremely small, and the integral flow deviation of the electronic expansion valve is small.

As shown in fig. 7, the screw 60 may also be provided with a screw receiving groove 624, a part of the steel ball 80 is located in the screw receiving groove 624, the screw 60 may be provided with a deformation portion to clamp the steel ball 80 in a riveting deformation manner, when the valve needle 70 is not abutted to the valve port 11, a gap is formed between the steel ball 80 and the valve needle 70, when the steel ball 80 is abutted to the valve needle 70, the valve needle 70 is abutted to the valve port 11, and the technical effects of the present application can also be achieved.

Referring to fig. 9-13, a second embodiment of the electronic expansion valve provided in the present application will be briefly described, which is different from the first embodiment in that the valve needle and the lead screw are engaged, the lead screw 60 'in the present embodiment includes a support portion, a lead screw recess 622', and a connecting portion 623', the support portion in the present embodiment may be a second support portion 621', the lead screw recess 622 'is located between the second support portion 621' and the connecting portion 623', the second support portion 621' may be a substantially radial protrusion near the valve port 11 and extending from a lower end of the lead screw 60 'in a direction away from a central axis of the lead screw 60', specifically, the second support portion 621 'may be configured as a retaining ring, a snap spring, a latch, or the like to achieve a fixed connection or a limited connection with the lead screw recess 622' of the lead screw 60', and the valve needle 70' includes a second valve needle guide portion 72a A needle guide portion 72', a suspension portion and a needle abutting portion, wherein the second needle guide portion 72a ' is adapted to the nut guide hole, the second needle guide portion 72a ' is slidably engaged with the nut guide portion 54, the needle guide portion 72' is slidably engaged with the valve body guide portion 13, the needle 70' has a second accommodating portion 71' and a needle slot 73', the suspension portion may be a second suspension portion 721' in the present embodiment, the second suspension portion 621' can be abutted against the second suspension portion 721', the second suspension portion 621' is located below the second suspension portion 721', the second suspension portion 621' is closer to the valve port portion 11 than the second suspension portion 721', the second suspension portion 721' may be integrated with the second needle guide portion 72a ', and may be fixedly connected or position-limited connected with the second needle guide portion 72a ', and referring to the first needle arranging manner, the second suspension portion 721' may be substantially away from the upper end position of the valve port portion 11 toward the central axis 70' of the valve needle 70 A second hanging part 721' can be arranged to be connected with the second valve needle guiding part 72a ' by a retaining ring or a snap spring or a latch, the lead screw 60' can be inserted into the second accommodating part 71' through the valve needle notch 73', the second supporting part 621' is located in the second accommodating part 71', and the second supporting part 621' can abut against the second hanging part 721', the lead screw 60' can drive the valve needle 70' to move axially upwards, in at least one radial direction, the lead screw and the valve needle are not provided with a structure capable of preventing the lead screw and the valve needle from being separated from each other, the lead screw can be arranged into the second accommodating part of the valve needle through the valve needle notch in a radial direction, the nut guiding part 54 of the nut component 50 can substantially limit the lead screw and the valve needle in a radial direction after installation, the valve needle can be prevented from being separated from the lead screw, the connection structure of the valve needle and the lead screw is relatively convenient and reliable, and the installation method is simpler, it should be noted that the radial direction stated in the specification of the present application includes a radial direction extending in a horizontal direction and also includes a radial direction extending in a direction substantially inclined. The second support 621' includes a lower support end face 6211' and an upper support end face 6212', the electronic expansion valve includes a steel ball 80, the screw 60' may be provided with a screw receiving groove, the screw receiving groove is recessed inwards from the screw end face of the screw 60', part of the steel ball 80 is located in the screw receiving groove, the screw 60' may be provided with a deformation portion to clamp the steel ball 80 in a riveting deformation manner, when the valve needle 70 is not abutted against the valve port portion 11, the steel ball 80 has a gap with the valve needle 70', and the upper support end face 6212' is abutted against the second suspension portion 721 '; when the steel ball 80 abuts against the needle 70', the needle 70 abuts against the valve port portion 11, and the upper support end surface 6212' has a gap from the second hanging portion 721 '.

Or the valve needle 70 'may also be provided with a valve needle accommodating groove 74', a part of the steel ball is located in the valve needle accommodating groove 74', and the valve needle accommodating groove 74' is added with grease to adhere the steel ball to prevent the steel ball from moving in motion, when the valve needle 70 'is relatively far away from the valve port 11 or contacts the valve port 11, that is, when the valve needle 70' does not abut against the valve port 11, the lower support end face 6211 'of the second support portion 621' has a gap L3 with the steel ball 80, and when the lower support end face 6211 'abuts against the steel ball, the valve needle 70' abuts against the valve port 11, and the gap L3 moves between the upper support end face 6212 'and the second suspension portion 721'.

Referring to fig. 10-13, the actuating method of the electronic expansion valve according to the second embodiment provided by the present application is briefly described, wherein the rotor rotates under the influence of the excitation of the coil component, the rotor seat 42 and the lead screw 60 'also rotate synchronously, the lead screw 60' moves axially downward together with the valve needle 70 'through the screw-thread cooperation between the lead screw 60' and the nut 50, the valve needle 70 'gradually approaches the valve port 110, when the valve needle 70' is not abutted against the valve port 11, a gap L3 exists between the steel ball 80 and the lower supporting end face 6211 'of the second supporting portion 621', the second supporting portion 621 'abuts against the second suspending portion 721', the lead screw 60 can still move downward due to the existence of the gap, the lead screw 60 'continues to move downward to eliminate the gap L3 between the steel ball and the lower supporting end face 6211', when the gap between the steel ball 80 and the lower supporting end face 6211 'disappears to form the steel ball 80 abutted against the second supporting portion 621', the valve needle 70 abuts against the valve port 11, a gap L3 between the steel ball 80 and the lower supporting end face 6211 'of the second supporting portion 621' is transferred to a gap between the upper supporting end face 6212 'and the second suspension portion 721', at this time, a gap L3 'is formed between the second supporting portion 621' and the second suspension portion 721', the screw rod 60' is no longer displaced downward due to the reverse acting force of the steel ball 80, the valve needle 70 'and the valve port 11 are in an abutting state to form a lower stop structure of the electronic expansion valve, as shown in fig. 15, the valve needle abuts against the valve port 11, and the gap L3 is moved to a gap L3' formed between the second supporting portion 621 'and the second suspension portion 721', and corresponding technical effects are described in detail in the first embodiment and are not described herein.

The valve needle 70 may include a first abutting portion 81, the first abutting portion and the valve needle 70 are integrated into a whole structure, or the first abutting portion and the valve needle 70 may be separately provided and then fixedly connected or bonded, as shown in the figure/drawing, the first abutting portion is a substantially hemispherical portion protruding from the valve needle recess 74 of the valve needle 70 in a direction away from the valve port, or an arc portion or an angular portion may be allowed to abut against the screw needle 60, and a substantially point contact state may be achieved, where the substantially point contact state refers to a state including a point contact state and a smaller plane processed at the end of the hemispherical portion or the steel ball, and when the screw needle abuts against the steel ball or the first abutting portion, the screw needle receives a smaller or negligible transmission torque, and when the valve needle does not abut against the valve port, the screw rod has a gap with the first abutting portion, the first supporting portion 621 abuts against the first hanging portion 721, when the screw rod abuts against the first abutting portion, the valve needle 70 abuts against the valve port portion 11, and the first supporting portion 621 has a gap with the first hanging portion 721.

Alternatively, in the first embodiment, as shown in fig. 8, the screw rod may include a second abutting portion 81', the second abutting portion and the screw rod are integrated, or the second abutting portion and the valve needle 70 may be separately disposed and then fixedly connected or connected in a limited manner or bonded. The second abutting portion is a substantially hemispherical portion protruding from the screw guide 62 of the screw in a direction approaching the valve port 11, or the second abutting portion may be an arc-shaped portion or an angular portion, and the second abutting portion can be abutted against the valve needle 70 to form a substantially point contact state, where the substantially point contact state includes a point contact state and a smaller plane is processed at an end of the hemispherical portion or the steel ball, a screw transmission torsion force received by the valve needle when the screw abuts against the steel ball or the first abutting portion is small or negligible, when the valve needle does not abut against the valve port, the valve needle has a gap with the second abutting portion 81', the first supporting portion 621 abuts against the first suspending portion 721, when the valve needle abuts against the second abutting portion, the valve needle 70 abuts against the valve port 11, and the first supporting portion 621 has a gap with the first suspending portion 721.

In the second embodiment, the valve needle 70' may include a first abutting portion, which may be a hemispherical portion that is projected in a direction away from the valve port portion by the second valve needle guide portion 72a ', the first abutting portion being integrally formed with the valve needle 70', or the first abutting part and the valve needle 70 'can be arranged separately and then fixed, limited or bonded, or can be an arc part or an angular part, which can realize the abutting with the screw rod 60', when the valve needle is not abutted against the valve port portion, the lower support end face 6211 'of the second support portion 621' of the screw rod 60 'has a gap with the first abutment portion, the upper support end face 6212' of the second support portion 621 'is abutted against the second suspension portion 721', when the lower support end surface 6211' abuts against the first abutment portion, the needle 70' abuts against the valve port portion 11, and the upper support end surface 6212' of the second support portion 621' has a gap from the second suspending portion 721 '.

In the second embodiment, the screw 60 'may include a second abutting portion, the second abutting portion may be a hemispherical portion protruding from the second supporting portion 621' of the screw in a direction approaching the valve port portion, the second abutting portion and the screw 60 'are integrated, or the second abutting portion and the screw 60' may be separately provided and then fixedly connected or connected in a limited manner or bonded thereto, or may be an arc portion or an angular portion, and may be capable of abutting against the valve needle 70', when the valve needle is not abutted against the valve port portion, the second valve needle guiding portion 72a' of the valve needle 70 'has a gap with the second abutting portion, the upper supporting end face 6212' of the second supporting portion 621 'of the screw 60' abuts against the second suspending portion 721', and when the second valve needle guiding portion 72a' abuts against the second abutting portion, the upper supporting end face 6212 'abuts against the second suspending portion 721'.

Alternatively, in the first and second embodiments, the valve needle may include a first abutting portion, the screw may include a second abutting portion, the first abutting portion and the second abutting portion may have a gap when the valve needle is not abutted against the valve port portion, the support portion may be abutted against the hanging portion, and the valve needle may be abutted against the valve port portion and the support portion may have a gap with the hanging portion when the first abutting portion is abutted against the second abutting portion.

It should be noted that the fact that the valve needle is abutted to the valve port means that the valve needle is abutted to the valve port by the acting force transmitted by the screw rod to form an abutting state; the state that the valve needle is relatively far away from the valve port part is indicated when the valve needle is not abutted against the valve port part, and the state that the valve needle is contacted with the valve port part but is not acted on the valve needle by the driving force of the screw rod so that the valve needle is abutted against the valve port part is also included.

In addition, the references stated in the present application do not only refer to direct mutual contact between the components, but also include indirect mutual contact between the components through a coating or through the additional arrangement of a third component.

A third embodiment of the electronic expansion valve structure provided by the present application is briefly described below with reference to fig. 14 to 16, and is different from the first two embodiments in that the electronic expansion valve in this embodiment may be a one-way flow structure in which refrigerant entering from a cross pipe flows out from a valve port 110 toward a vertical pipe, a steel ball or a first abutting portion or a second abutting portion is omitted between a screw rod and a valve needle, as shown in fig. 14 and 15, the screw rod 60 includes a first notch 622 and a first accommodating portion 623, and also includes a first supporting portion 621, the valve needle 70 includes a first suspension portion 721, the first suspension portion 721 extends into the screw rod 60 through the first notch 622 in a substantially radial direction, the first suspension portion 721 can abut against the first supporting portion 621, the first suspension portion 721 includes a lower suspension end surface and an upper suspension end surface, the screw rod 60 has a valve port end surface 64, when the valve needle does not abut against the first supporting portion 621, the first suspension 721 abuts against the first support 621; when the valve needle abuts against the valve port 11, a gap L4 is formed between the lower suspension end surface of the first suspension part 721 and the first support part 621, a gap L5 is formed between the upper suspension end surface and the end surface of the screw rod, the valve needle closes the valve port 11 by self gravity, and due to the excitation of the coil, the screw rod 60 rotates downward, compared with the structure provided with the steel ball, although more transmission torque force is applied to the valve needle, the valve can be closed smoothly.

As shown in fig. 16, the screw 60' includes a second support 621', the valve needle 70' includes a second suspension portion 721', and the valve needle 70' has a first accommodation portion 71' and a second slot 73', the screw 60' extends into the valve needle through the second slot 73' in a substantially radial direction, and the second suspension portion abuts against the second support when the valve needle does not abut against the valve port 11; when the valve needle abuts against the valve opening portion, the upper support end surface of the second support portion 621' and the second suspension portion 721' have a gap L4', and a gap L5' is formed between the lower support end surface of the second support portion 621' and the valve needle 70', and when the screw rod 60' rotates downward, due to the excitation of the coil, compared with the structure in which the steel ball is provided, although more transmission torque force is applied to the valve needle, the valve can be closed smoothly. The application provides an electronic expansion valve, including the valve body part, nut part, lead screw and needle, the valve body part includes valve opening portion and valve body guide part, the lead screw includes lead screw portion, nut part includes nut screw portion, lead screw portion and nut screw portion screw-thread fit, the lead screw includes the supporting part, the needle includes needle guide part and linkage, needle guide part and valve body guide part sliding fit, the valve opening portion can be close to or kept away from to the needle, the relative linkage of supporting part is more close to the valve opening portion, the supporting part can offset with the linkage, the lead screw can take the direction motion of needle towards keeping away from the valve opening portion.

Through the optimal design to needle and lead screw structure, and both cooperation structures, when electronic expansion valve actuates, the needle can become the direction and carry out sliding fit with the valve body guide part of valve body part by oneself as an independent spare part relatively, the influence of the lead screw actuation that has significantly reduced, only upwards actuate in the axial just have great relevance with the lead screw when actuating, when the lead screw because of machining tolerance or when actuating the relative valve port of environmental impact and taking place the skew, the needle less receives the skew condition of taking place relative valve port to take place to incline of lead screw skew influence, can guarantee the axiality of needle and valve port, guarantee the valve relatively and actuate the reliability.

It should be noted that the ordinal numbers of "first" and "second" and the directional terms of "upper" and "lower" are set forth in the specification and drawings, respectively, and are not intended to limit the structure or sequence of the components.

The present invention has been described in terms of specific embodiments, which are merely illustrative of the principles and concepts that can be employed to facilitate an understanding of the present invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.