阅读说明：本技术 电子膨胀阀及制冷设备 (Electronic expansion valve and refrigeration equipment ) 是由 陈超 杨茂 于 2021-09-29 设计创作，主要内容包括：本发明公开一种电子膨胀阀及制冷设备。所述电子膨胀阀包括阀壳体、螺母、螺杆及阀针,所述阀壳体设有阀口；所述螺母安装于所述阀壳体内；所述螺杆部分插设于所述螺母内,并与所述螺母螺纹连接；所述阀针可移动地穿设于所述螺母和螺杆,所述阀针一端插设于所述阀口,所述阀针包括沿所述螺母轴向依次连接的主体段和贯穿段,所述主体段与所述螺母导向配合,所述贯穿段穿过所述螺杆设置；其中,所述主体段与所述螺母之间的配合间隙小于所述贯穿段与所述螺杆之间的配合间隙。本发明的电子膨胀阀能够避免阀针卡死,保证电子膨胀阀的可靠性。(The invention discloses an electronic expansion valve and refrigeration equipment. The electronic expansion valve comprises a valve shell, a nut, a screw and a valve needle, wherein the valve shell is provided with a valve port; the nut is arranged in the valve shell; the screw rod part is inserted in the nut and is in threaded connection with the nut; the valve needle is movably arranged in the nut and the screw in a penetrating mode, one end of the valve needle is inserted into the valve port, the valve needle comprises a main body section and a penetrating section which are sequentially connected along the axial direction of the nut, the main body section is matched with the nut in a guiding mode, and the penetrating section penetrates through the screw; wherein, the fit clearance between the main body section and the nut is smaller than the fit clearance between the penetrating section and the screw rod. The electronic expansion valve can avoid the valve needle from being stuck and ensure the reliability of the electronic expansion valve.)

1. An electronic expansion valve, comprising:

a valve housing provided with a valve port;

a nut mounted within the valve housing;

the screw rod is partially inserted into the nut and is in threaded connection with the nut; and the number of the first and second groups,

the valve needle is movably arranged in the nut and the screw in a penetrating mode, one end of the valve needle is inserted into the valve port, the valve needle comprises a main body section and a penetrating section which are sequentially connected along the axial direction of the nut, the main body section is matched with the nut in a guiding mode, and the penetrating section penetrates through the screw;

wherein, the fit clearance between the main body section and the nut is smaller than the fit clearance between the penetrating section and the screw rod.

2. The electronic expansion valve of claim 1, wherein a fit clearance between the body segment and the nut is less than a thread clearance between the screw and the nut.

3. The electronic expansion valve of claim 1, wherein the main body section has a diameter greater than a diameter of the through section.

4. The electronic expansion valve of claim 1, further comprising an elastic member disposed between an end of the screw facing the valve port and the body section.

5. The electronic expansion valve according to claim 1, wherein the valve needle further comprises a fixing section, the fixing section is disposed at an end of the penetrating section away from the main body section, the fixing section extends out of an end of the screw rod away from the nut, and the electronic expansion valve further comprises a positioning element, and the positioning element is disposed at the fixing section.

6. The electronic expansion valve of claim 5, further comprising a guide sleeve mounted within the valve housing, wherein the positioning member is movably inserted within the guide sleeve.

7. The electronic expansion valve of claim 6, wherein a fit clearance between the main body segment and the nut is smaller than a fit clearance between the positioning member and the guide sleeve.

8. The electronic expansion valve according to claim 6, wherein a fitting clearance between the positioning member and the guide sleeve is smaller than a fitting clearance between the penetrating section and the screw rod.

9. The electronic expansion valve of claim 6, wherein the guide sleeve is welded within the valve housing.

10. Refrigeration device, comprising an electronic expansion valve according to any of claims 1-9.

Technical Field

The invention relates to the field of household appliances, in particular to an electronic expansion valve and refrigeration equipment.

Background

In the related art, when the electronic expansion valve is used, the valve needle is easy to be stuck, so that the reliability of the electronic expansion valve is reduced.

Disclosure of Invention

The invention mainly aims to provide an electronic expansion valve, aiming at avoiding the valve needle from being stuck and ensuring the reliability of the electronic expansion valve.

In order to achieve the purpose, the electronic expansion valve provided by the invention comprises a valve shell, a nut, a screw and a valve needle, wherein the valve shell is provided with a valve port; the nut is arranged in the valve shell; the screw rod part is inserted in the nut and is in threaded connection with the nut; the valve needle is movably arranged in the nut and the screw in a penetrating mode, one end of the valve needle is inserted into the valve port, the valve needle comprises a main body section and a penetrating section which are sequentially connected along the axial direction of the nut, the main body section is matched with the nut in a guiding mode, and the penetrating section penetrates through the screw; wherein, the fit clearance between the main body section and the nut is smaller than the fit clearance between the penetrating section and the screw rod.

Optionally, a fit clearance between the main body segment and the nut is smaller than a thread clearance between the screw rod and the nut.

Optionally, the diameter of the main body section is larger than the diameter of the through section.

Optionally, the electronic expansion valve further includes an elastic member, and the elastic member is disposed between one end of the screw rod facing the valve port and the main body section.

Optionally, the valve needle further comprises a fixing section, the fixing section is arranged at one end, far away from the main body section, of the penetrating section, the fixing section extends out of one end, far away from the nut, of the screw rod, the electronic expansion valve further comprises a positioning piece, and the positioning piece is arranged at the fixing section.

Optionally, the electronic expansion valve further includes a guide sleeve installed in the valve housing, and the positioning element is movably inserted into the guide sleeve.

Optionally, a fit clearance between the main body segment and the nut is smaller than a fit clearance between the positioning piece and the guide sleeve.

Optionally, a fit clearance between the positioning element and the guide sleeve is smaller than a fit clearance between the penetrating section and the screw rod.

Optionally, the guide sleeve is welded into the valve housing.

The invention also proposes a refrigeration device comprising an electronic expansion valve as defined in any one of the above.

According to the electronic expansion valve, the main body section of the valve needle is matched with the nut in a guiding manner, namely the main body section of the valve needle is limited with the nut; one end of the screw rod is inserted into the nut and is in threaded connection with the nut, namely the nut and the screw rod are limited mutually; the penetration section of the valve needle penetrates through the screw rod, namely the penetration section of the valve needle and the screw rod are mutually limited, and the coaxiality of the valve needle and the valve port is ensured by limiting the main body section and the penetration section of the valve needle; when the fit clearance between the main body section and the nut is smaller than the fit clearance between the penetrating section and the screw rod, the coaxiality of the valve needle and the valve port is higher, the valve needle is prevented from deflecting, the valve needle is prevented from being clamped, and therefore the reliability of the electronic expansion valve is guaranteed.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic structural diagram of an electronic expansion valve according to an embodiment of the present invention;

fig. 2 is a schematic view illustrating a combined state of a valve needle and a positioning element of an embodiment of an electronic expansion valve according to the present invention;

FIG. 3 is a schematic structural diagram of a nut of an embodiment of an electronic expansion valve according to the present invention;

fig. 4 is a schematic structural diagram of a screw of an embodiment of the electronic expansion valve of the present invention.

The reference numbers illustrate:

the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

The invention provides an electronic expansion valve 100, which is applied to a refrigeration system. The refrigerating system can be a refrigerating system of an air conditioner, a refrigerator, a heat pump water heater or other refrigerating and heating equipment. The electronic expansion valve 100 is able to control the refrigerant medium flow in the refrigeration system.

In the embodiment of the present invention, as shown in fig. 1-4, the electronic expansion valve 100 includes a valve housing 10, a nut 20, a screw 30 and a valve needle 40, wherein the valve housing 10 is provided with a valve port 111; the nut 20 is mounted in the valve housing 10; the screw rod 30 is partially inserted into the nut 20 and is in threaded connection with the nut 20; the valve needle 40 is movably disposed through the nut 20 and the screw rod 30, one end of the valve needle 40 is inserted into the valve port 111, the valve needle 40 includes a main body section 41 and a penetrating section 42 sequentially connected along the axial direction of the nut 20, the main body section 41 is in guiding fit with the nut 20, and the penetrating section 42 is disposed through the screw rod 30; wherein the fit clearance between the main body section 41 and the nut 20 is smaller than the fit clearance between the through section 42 and the screw 30.

Specifically, the nut 20 has a threaded hole section 21 and a guide hole section 22 arranged in the axial direction in sequence, one end of the screw 30 is in threaded connection with the threaded hole section 21, and the main body section 41 of the needle 40 is in guiding fit with the guide hole section 22. The electronic expansion valve 100 further includes a stator assembly and a rotor assembly 80, the rotor assembly 80 is fixedly connected to the screw 30, the stator assembly is sleeved outside the valve housing 10, and the stator assembly is disposed at a position corresponding to the rotor assembly 80. One end of the screw 30 is reciprocally movable between a first position and a second position along the axial direction of the nut 20 and is arranged in the threaded hole section 21 of the nut 20, the screw 30 is provided with a through hole, the valve needle 40 is movably arranged through the through hole and the nut 20, and the valve needle 40 is in transmission connection with the screw 30.

It should be noted that, after the electronic expansion valve 100 is powered on, the rotor assembly 80 rotates along the preset direction to drive the screw 30 to rotate, the screw 30 is in threaded fit with the nut 20, so that the screw 30 moves towards the valve port 111 along the axial direction of the nut 20, and the screw 30 moves the valve needle 40 towards the valve port 111 along the axial direction of the nut 20, thereby closing the valve port 111; the rotor assembly 80 rotates in a direction opposite to the predetermined direction to drive the screw 30 to rotate, so that the screw 30 moves in the axial direction of the nut 20 toward a direction away from the valve port 111, and the screw 30 moves the valve needle 40 in the axial direction of the nut 20 toward a direction away from the valve port 111, thereby opening the valve port 111 to adjust the flow rate of the refrigerant.

The valve housing 10 includes a valve seat 11 and a housing 12, the valve seat 11 is provided with a valve port 111, the housing 12 is connected to an end of the valve seat 11 away from the valve port 111, the housing 12 and the valve seat 11 are sealed to form a valve cavity, a side wall of the valve seat 11 is provided with a medium inlet, the valve cavity is communicated with the valve port 111 and a medium inlet, the medium inlet is connected with a medium inlet pipe, and the valve port 111 is connected with a medium outlet pipe. It can be understood that the refrigerant flows into the valve cavity from the medium inflow pipe, and flows to the medium outflow pipe through the valve port 111 when the valve needle 40 opens the valve port 111; of course, the refrigerant may also flow in the opposite direction, i.e., the refrigerant flows into the valve cavity from the medium flow pipe through the valve port 111 and flows out from the medium flow pipe.

In the electronic expansion valve 100 of the present invention, the valve needle 40 is guided and matched with the main body section 41 of the nut 20, that is, the nut 20 and the main body section 41 of the valve needle 40 are mutually limited; one end of the screw rod 30 is inserted into the nut 20 and is in threaded connection with the nut 20, namely the screw rod 30 and the nut 20 are limited mutually; the penetrating section 42 of the valve needle 40 penetrates through the screw rod 30, namely the screw rod 30 and the penetrating section 42 of the valve needle 40 are limited mutually, and the main body section 41 and the penetrating section 42 of the valve needle 40 are limited to limit the valve needle 40, so that the coaxiality of the valve needle 40 and the valve port 111 is ensured; the diameter of the guide hole section 22 is D1, the diameter of the main body section 41 is D1, the difference between D1 and D1 is the fit clearance between the nut 20 and the main body section 41, the diameter of the through hole of the screw 30 is D2, the diameter of the penetrating section 42 is D2, the difference between D2 and D2 is the fit clearance between the screw 30 and the penetrating section 42, and when the fit clearance between the nut 20 and the main body section 41 is smaller than the fit clearance between the screw 30 and the penetrating section 42, the coaxiality between the valve needle 40 and the valve port 111 is higher, so that the valve needle 40 is prevented from deflecting, the valve needle 40 is prevented from being stuck, and the reliability of the electronic expansion valve 100 is ensured.

In one embodiment, as shown in fig. 2-4, the fit clearance between the nut 20 and the body segment 41 is less than the thread clearance between the nut 20 and the threaded rod 30. Specifically, the thread clearance between the nut 20 and the screw 30 is a difference between a crest diameter of the external thread of the screw 30 and a root diameter of the internal thread of the threaded hole section 21 or a difference between a root diameter of the external thread of the screw 30 and a crest diameter of the internal thread of the threaded hole section 21. In this embodiment, the root diameter of the internal thread of the threaded hole section 21 is the internal diameter of the threaded hole section 21, the internal diameter of the threaded hole section 21 is D3, the crest diameter of the external thread of the screw 30 is the external diameter of the screw 30, the external diameter of the screw 30 is D3, and the difference between D3 and D3 is the thread clearance between the screw 30 and the nut 20. When the fit clearance between the nut 20 and the main body section 41 is smaller than the thread clearance between the nut 20 and the screw 30, the valve needle 40 and the valve port 111 are higher in coaxiality, the valve needle 40 is prevented from deflecting, the valve needle 40 is prevented from being stuck, the screw 30 can be prevented from deflecting, the problem that the screw 30 and the threaded hole section 21 are friction-stuck due to the fact that the fit clearance is too small is solved, friction damage between the screw 30 and the threaded hole section 21 of the nut 20 is reduced, and therefore the reliability of the electronic expansion valve 100 is guaranteed.

In one embodiment, as shown in fig. 1-2, the main body section 41 has a diameter greater than the diameter of the through section 42. Specifically, the diameter of the threaded hole section 21 is similar to that of the guide hole section 22, one end of the screw 30 is inserted into the threaded hole section 21 and is in threaded fit with the threaded hole section 21, and the diameter of the main body section 41 of the valve needle 40 is larger than that of the through section 42 of the valve needle 40, so that an escape space is formed between the threaded hole section 21 and the through section 42 for inserting one end of the screw 30.

In an embodiment, as shown in fig. 1, the electronic expansion valve 100 further includes an elastic member 50, and the elastic member 50 is disposed between an end of the screw 30 facing the valve port 111 and the main body section 41. Specifically, the elastic element 50 is a spring, the spring is sleeved on the penetrating section 42, one end of the spring abuts against one end of the screw 30 facing the valve port 111, and the other end of the spring abuts against the main body section 41. When the electronic expansion valve 100 is powered on, the rotor assembly 80 rotates in the predetermined direction to drive the screw 30 to rotate, the screw 30 is in threaded engagement with the nut 20, so that the screw 30 moves toward the valve port 111 along the axial direction of the nut 20, and the screw 30 abuts against the spring to move the valve needle 40 toward the valve port 111 along the axial direction of the nut 20, thereby closing the valve port 111.

In an embodiment, as shown in fig. 1 and fig. 2, the valve needle 40 further includes a fixing section 43, the fixing section 43 is disposed at an end of the penetrating section 42 away from the main body section 41, the fixing section 43 extends out of an end of the screw 30 away from the nut 20, and the electronic expansion valve 100 further includes a positioning element 60, and the positioning element 60 is disposed at the fixing section 43. Specifically, the positioning element 60 is cylindrical, the positioning element 60 is sleeved on the fixing section 43, and the positioning element 60 and the fixing section 43 are welded or press-fitted in an interference manner. The rotor assembly 80 rotates in a direction opposite to the predetermined direction to drive the screw 30 to rotate, so that the screw 30 moves in a direction away from the valve port 111 along the axial direction of the nut 20, and the screw 30 abuts against the positioning member 60 towards one end of the valve port 111, so that the valve needle 40 moves in the direction away from the valve port 111 along the axial direction of the nut 20, thereby opening the valve port 111.

In one embodiment, as shown in fig. 1, the electronic expansion valve 100 further includes a guide sleeve 70 installed in the valve housing 10, and the positioning member 60 is movably inserted in the guide sleeve 70. Specifically, the guide sleeve 70 includes a guide portion 71 and a mounting portion 72 connected to one axial end of the guide portion 71, the guide portion 71 is disposed in a cylindrical shape, the guide portion 71 is disposed coaxially with the valve port 111, the positioning member 60 is movably inserted into the guide portion 71, and the positioning member 60 is in clearance fit with an inner peripheral wall of the guide portion 71.

In one embodiment, as shown in fig. 1-2, the fit clearance between the main body segment 41 and the nut 20 is smaller than the fit clearance between the positioning member 60 and the guide sleeve 70. It can be understood that the guide sleeve 70 is in guiding fit with the positioning member 60, that is, the guide sleeve 70 and the positioning member 60 are mutually limited, and the positioning member 60 is disposed on the fixing section 43 of the valve needle 40, that is, the guide sleeve 70 and the positioning member 60 are matched to limit the position of the valve needle 40, so as to improve the coaxiality of the valve needle 40 and the valve port 111. The inner diameter of the guide sleeve 70 is D4, the outer diameter of the positioning element 60 is D4, and the difference between D4 and D4 is the fit clearance between the positioning element 60 and the guide sleeve 70. When the fit clearance between the main body segment 41 and the nut 20 is smaller than the fit clearance between the positioning member 60 and the guide sleeve 70, the valve needle 40 and the valve port 111 are more coaxial, so that the valve needle 40 is prevented from deflecting, the valve needle 40 is prevented from being stuck, and the reliability of the electronic expansion valve 100 is ensured.

In an embodiment, as shown in fig. 1 to 4, a fitting clearance between the positioning element 60 and the guide sleeve 70 is smaller than a fitting clearance between the through section 42 and the screw 30, so that the valve needle 40 is more coaxial with the valve port 111, the valve needle 40 is prevented from deflecting, the valve needle 40 is prevented from being stuck, and reliability of the electronic expansion valve 100 is ensured.

In one embodiment, as shown in FIG. 1, the guide sleeve 70 is welded into the valve housing 10. Specifically, the guide sleeve 70 is welded to the inner wall of the housing 12 via the mounting portion 72 by laser penetration welding or spot welding.

The present invention further provides a refrigeration device, which includes an electronic expansion valve 100, and the specific structure of the electronic expansion valve 100 refers to the above embodiments, and since the refrigeration device adopts all technical solutions of all the above embodiments, at least all beneficial effects brought by the technical solutions of the above embodiments are achieved, and are not described in detail herein. The refrigeration equipment can be an air conditioner, a refrigerator, a heat pump water heater and the like.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.