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 杨茂 陈超 黄龙华 江波 于 2020-12-14 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,其中,电子膨胀阀包括阀壳体、螺母、阀针、阀针套及阀杆；阀壳体设有阀腔及与阀腔连通的阀口；螺母安装于阀壳体内；阀针插设于阀口内,且与阀口间隙配合；阀针套与阀针连接,阀针套位于螺母的内腔,且与螺母的内壁面呈间隙设置；阀杆一端伸入阀针套的内腔并与阀针传动连接,阀杆与所述阀针套间隙配合；其中,阀针套与螺母的内壁面之间的间隙大于阀针与阀口的内壁面之间的最小配合间隙；阀杆与阀针套之间的配合间隙大于阀针与阀口的内壁面之间的最小配合间隙。本发明电子膨胀阀可有效避免阀针卡死,且同时还能够避免阀芯组件组装过程中同轴度偏差导致的偏心对阀针的影响。(The invention discloses an electronic expansion valve and refrigeration equipment, wherein the electronic expansion valve comprises a valve shell, a nut, a valve needle sleeve and a valve rod; the valve shell is provided with a valve cavity and a valve port communicated with the valve cavity; the nut is arranged in the valve shell; the valve needle is inserted in the valve port and is in clearance fit with the valve port; the valve needle sleeve is connected with the valve needle, the valve needle sleeve is positioned in the inner cavity of the nut and is arranged in a clearance with the inner wall surface of the nut; one end of the valve rod extends into the inner cavity of the valve needle sleeve and is in transmission connection with the valve needle, and the valve rod is in clearance fit with the valve needle sleeve; the clearance between the valve needle sleeve and the inner wall surface of the nut is larger than the minimum fit clearance between the valve needle and the inner wall surface of the valve port; the fit clearance between the valve rod and the valve needle sleeve is larger than the minimum fit clearance between the valve needle and the inner wall surface of the valve port. The electronic expansion valve can effectively avoid the valve needle from being stuck, and can also avoid the influence of eccentricity on the valve needle caused by coaxiality deviation in the assembling process of the valve core assembly.)

1. An electronic expansion valve, comprising:

the valve shell is provided with a valve cavity and a valve port communicated with the valve cavity;

a nut mounted within the valve housing;

the valve needle is inserted into the valve port and is in clearance fit with the valve port;

the valve needle sleeve is connected with the valve needle, is positioned in the inner cavity of the nut and is arranged in a clearance with the inner wall surface of the nut;

one end of the valve rod extends into the inner cavity of the valve needle sleeve and is in transmission connection with the valve needle, and the valve rod is in clearance fit with the valve needle sleeve;

wherein a gap between an outer wall surface of the valve needle sleeve and an inner wall surface of the nut is larger than a minimum fit gap between the valve needle and the inner wall surface of the valve port; the fit clearance between the valve rod and the valve needle sleeve is larger than the minimum fit clearance between the valve needle and the inner wall surface of the valve port.

2. The electronic expansion valve according to claim 1, wherein the valve needle sleeve has a first opening through which the valve stem passes, the valve stem having an actuating end, the actuating end of the valve stem being disposed within the valve needle sleeve;

the fit clearance between the valve rod and the valve needle sleeve is a clearance between the valve rod and the inner wall surface of the first opening.

3. The electronic expansion valve according to claim 2, wherein the valve needle sleeve comprises a cylinder body and a limiting ring disposed at an end of the cylinder body away from the valve port, the limiting ring is disposed to protrude from an inner wall surface of the cylinder body, and the first opening is formed in a middle portion of the limiting ring.

4. The electronic expansion valve according to claim 3, wherein the valve needle sleeve is separately connected to the valve needle, and a position-limiting flange is provided on a peripheral wall of the actuation end of the valve rod, the position-limiting flange being located in the cylinder body, the position-limiting flange being in position-limiting abutment with the position-limiting ring.

5. The electronic expansion valve according to any one of claims 1 to 4, wherein a fitting clearance between the valve stem and the valve needle sheath is larger than a clearance between the valve needle sheath and an inner wall surface of the nut.

6. The electronic expansion valve according to any of claims 1-4, wherein the valve needle comprises a connecting portion and a needle portion, the connecting portion is connected to the valve needle sleeve, and the needle portion is inserted into the valve port and is in clearance fit with the valve port.

7. The electronic expansion valve according to claim 6, wherein the needle-like portion is formed with a flat section at a position adjacent to the connecting portion, a flat section is formed at a side of the valve port adjacent to the valve needle cover, and a gap between an outer wall surface of the flat section and an inner wall surface of the flat section forms the minimum fitting gap.

8. The electronic expansion valve according to any of claim 6, wherein the end of the needle sleeve near the valve port has a second opening, the connecting portion is mounted at the second opening of the needle sleeve, and the connecting portion is in interference fit with the needle sleeve.

9. The electronic expansion valve according to any of claims 1 to 4, wherein an end of the valve stem remote from the valve needle is threadedly connected to the nut.

10. The electronic expansion valve according to any one of claims 1 to 4, further comprising a buffer spring and a buffer slider, wherein the buffer spring and the buffer slider are disposed in an inner cavity of the valve needle sleeve, the buffer slider abuts against the valve needle, and the valve rod is connected to the buffer slider through the buffer spring.

11. The electronic expansion valve according to any one of claims 1 to 4, wherein the valve housing comprises a valve seat and a valve core seat, the valve seat is provided with a mounting opening, the valve core seat is mounted at the mounting opening, the valve core seat is provided with the valve port, and the nut is mounted on the valve seat.

12. The electronic expansion valve according to claim 11, further comprising a connecting sheet, wherein the valve seat has a positioning plane away from the valve port, the nut has a slot and a positioning portion, the connecting sheet is engaged with the slot and abuts against the positioning plane, and the positioning portion is in interference fit with an inner wall surface of the valve seat.

13. The electronic expansion valve of claim 1, wherein the needle sheath is integrally or separately attached to the valve needle.

14. A refrigeration device comprising an electronic expansion valve as claimed in any one of claims 1 to 13.

Technical Field

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

Background

In the refrigeration cycle system, an electronic expansion valve is generally provided between the outdoor heat exchanger and the indoor heat exchanger. When the outdoor heat exchanger is in a refrigeration mode, the electronic expansion valve throttles and reduces the pressure of the refrigerant from the outdoor heat exchanger and guides the refrigerant to the indoor heat exchanger; when the air conditioner is in a heating mode, the electronic expansion valve throttles and reduces the pressure of the refrigerant from the indoor heat exchanger and guides the refrigerant to the outdoor heat exchanger. However, fine foreign matters can inevitably enter the system in the use process of the electronic expansion valve, and if the foreign matters are clamped between the valve port and the valve needle, the valve needle can deflect to cause the valve needle to be clamped.

The above is only for the purpose of assisting understanding of the technical solutions of the present invention, and does not represent an admission that the above is the prior art.

Disclosure of Invention

The invention mainly aims to provide an electronic expansion valve and refrigeration equipment, and aims to solve the technical problem that the electronic expansion valve is easy to block.

In order to achieve the purpose, the electronic expansion valve provided by the invention comprises a valve shell, a nut, a valve needle sleeve and a valve rod;

the valve shell is provided with a valve cavity and a valve port communicated with the valve cavity;

the nut is arranged in the valve shell;

the valve needle is inserted into the valve port and is in clearance fit with the valve port;

the valve needle sleeve is connected with the valve needle, is positioned in the inner cavity of the nut and is arranged in a clearance with the inner wall surface of the nut;

one end of the valve rod extends into the inner cavity of the valve needle sleeve and is in transmission connection with the valve needle, and the valve rod is in clearance fit with the valve needle sleeve;

wherein a gap between an outer wall surface of the valve needle sleeve and an inner wall surface of the nut is larger than a minimum fit gap between the valve needle and the inner wall surface of the valve port; the fit clearance between the valve rod and the valve needle sleeve is larger than the minimum fit clearance between the valve needle and the inner wall surface of the valve port.

In one embodiment, the valve needle sleeve is provided with a first opening for the valve rod to pass through, the valve rod is provided with an action end, and the action end of the valve rod is arranged in the valve needle sleeve;

the fit clearance between the valve rod and the valve needle sleeve is a clearance between the valve rod and the inner wall surface of the first opening.

In one embodiment, the valve needle sleeve comprises a cylinder body and a limiting ring arranged at one end of the cylinder body far away from the valve port, the limiting ring is arranged by protruding the inner wall surface of the cylinder body, and the middle part of the limiting ring forms the first opening.

In one embodiment, the valve needle sleeve is connected with the valve needle in a split manner, a limiting flange is arranged on the peripheral wall of the action end of the valve rod, the limiting flange is positioned in the cylinder body, and the limiting flange is in limiting and abutting contact with the limiting ring.

In one embodiment, a fit clearance between the valve stem and the valve needle sleeve is greater than a clearance between the valve needle sleeve and an inner wall surface of the nut.

In one embodiment, the valve needle includes a connecting portion connected to the valve needle sleeve, and a needle portion inserted into the valve port and in clearance fit with the valve port.

In one embodiment, a straight section is formed at a position of the needle-shaped portion adjacent to the connecting portion, a flat section is formed at a side of the valve port close to the valve needle sleeve, and a gap between an outer wall surface of the straight section and an inner wall surface of the flat section forms the minimum fitting gap.

In one embodiment, one end of the needle sleeve close to the valve port has a second opening, the connecting portion is mounted at the second opening of the needle sleeve, and the connecting portion is in interference fit with the needle sleeve.

In one embodiment, an end of the valve stem remote from the valve needle is threadedly connected to the nut.

In an embodiment, the electronic expansion valve further includes a buffer spring and a buffer slide block, the buffer spring and the buffer slide block are disposed in the inner cavity of the valve needle sleeve, the buffer slide block abuts against the valve needle, and the valve rod is connected to the buffer slide block through the buffer spring.

In one embodiment, the valve housing includes a valve seat and a valve core seat, the valve seat is provided with a mounting opening, the valve core seat is mounted at the mounting opening, the valve port is formed on the valve core seat, and the nut is mounted on the valve seat.

In an embodiment, the electronic expansion valve further includes a connecting piece, the valve seat has a positioning plane away from the valve port, the nut is provided with a clamping groove and a positioning portion, the connecting piece is clamped in the clamping groove and abuts against the positioning plane, and the positioning portion is in interference fit with an inner wall surface of the valve seat.

In one embodiment, the valve needle sleeve is integrally or separately connected with the valve needle.

The invention also provides refrigeration equipment which comprises an electronic expansion valve, wherein the electronic expansion valve comprises a valve shell, a nut, a valve needle sleeve and a valve rod;

the valve shell is provided with a valve cavity and a valve port communicated with the valve cavity;

the nut is arranged in the valve shell;

the valve needle is inserted into the valve port and is in clearance fit with the valve port;

the valve needle sleeve is connected with the valve needle, is positioned in the inner cavity of the nut and is arranged in a clearance with the inner wall surface of the nut;

one end of the valve rod extends into the inner cavity of the valve needle sleeve and is in transmission connection with the valve needle, and the valve rod is in clearance fit with the valve needle sleeve;

wherein a gap between an outer wall surface of the valve needle sleeve and an inner wall surface of the nut is larger than a minimum fit gap between the valve needle and the inner wall surface of the valve port; the fit clearance between the valve rod and the valve needle sleeve is larger than the minimum fit clearance between the valve needle and the inner wall surface of the valve port.

The electronic expansion valve of the invention ensures that the clearance between the outer wall surface of the valve needle sleeve and the inner wall surface of the nut is larger than the minimum fit clearance between the valve needle and the inner wall surface of the valve port; and the fit clearance between the valve rod and the valve needle sleeve is larger than the minimum fit clearance between the valve needle and the inner wall surface of the valve port. When a foreign object is clamped between the valve port and the valve needle, even if the valve needle deflects, and the fit clearance between the valve rod and the valve needle sleeve is larger than the minimum fit clearance between the valve needle and the inner wall surface of the valve port, enough movable space is formed between the valve needle sleeve and the valve rod, the valve needle can drive the valve needle sleeve to incline towards one side of the inner wall surface of the nut relative to the valve rod integrally, the valve needle sleeve and the valve rod cannot be clamped mutually to influence the vertical movement of the valve needle, and when the valve needle drives the valve needle sleeve to incline towards one side of the inner wall surface of the nut relative to the valve rod integrally, because enough movable space is formed between the valve needle sleeve and the inner wall surface of the nut, the valve. And then guarantee to go into between needle and the valve port when going into the foreign matter, all have sufficient deviation activity space at valve rod and nut side when needle and the whole slope of needle cover, then can also make the needle smoothly move on the upper and lower side to can effectively avoid the needle card to die, and can also avoid the eccentric influence to the needle that the axiality deviation leads to in the valve core subassembly equipment process simultaneously.

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 sectional view of an embodiment of an electronic expansion valve of the present invention, wherein a valve needle is in a state of opening a valve port;

fig. 2 is a sectional view of the electronic expansion valve of fig. 1, wherein the valve needle is in a state of closing the valve port;

FIG. 3 is an enlarged view of a portion of FIG. 2 at A;

fig. 4 is a partially enlarged view of fig. 2 at B.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)
				100	Valve housing	320	Needle-shaped part
110	Valve seat	321	Straight section
				111	Valve cavity	400	Valve needle sleeve
112	Mounting port	410	First opening
				113	Location plane	420	Cartridge body
120	Valve core seat	430	Spacing ring
				121	Valve port	440	Second opening
1211	Flat mouth section	500	Valve rod
				130	Outer casing	510	Action end
200	Nut	520	Limit flange
				210	Clamping groove	600	Buffer spring
220	Positioning part	700	Buffer slide block
				300	Valve needle	800	Connecting sheet
310	Connecting part

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, 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, the meaning of "and/or" appearing throughout is to include three juxtapositions, exemplified by "A and/or B" including either scheme A, or scheme B, or a scheme in which both A and B are satisfied. 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 which is applied to refrigeration equipment. The refrigerating equipment can be an air conditioner, a refrigerator, a heat pump water heater or other refrigerating and heating equipment. The electronic expansion valve is able to control the refrigerant medium flow in the refrigeration system.

In the embodiment of the present invention, as shown in fig. 1 to 4, the electronic expansion valve includes a valve housing 100, a nut 200, a valve needle 300, a valve needle sleeve 400, and a valve stem 500. The valve housing 100 is provided with a valve cavity 111 and a valve port 121 communicated with the valve cavity 111; the nut 200 is installed in the valve housing 100. The valve needle 300 is inserted into the valve port 121 and is in clearance fit with the valve port 121. The needle sleeve 400 is connected with the needle 300, and the needle sleeve 400 is located in the inner cavity of the nut 200 and is arranged with a gap from the inner wall surface of the nut 200. One end of the valve rod 500 extends into the inner cavity of the valve needle sleeve 400 and is in transmission connection with the valve needle 300, and the valve rod 500 is in clearance fit with the valve needle sleeve 400. Wherein the clearance between the outer wall surface of the needle cover 400 and the inner wall surface of the nut 200 (D3-D4 shown in fig. 4) is larger than the minimum fitting clearance between the needle 300 and the inner wall surface of the valve port 121 (D1-D2 shown in fig. 3); the fit clearance between the valve stem 500 and the valve needle sleeve 400 (D5-D6 as shown in fig. 4) is greater than the minimum fit clearance between the valve needle 300 and the inner wall surface of the valve port 121 (D1-D2 as shown in fig. 3).

In this embodiment, the valve housing 100 may specifically include a valve seat 110 and a housing 130, and the housing 130 is connected to the valve seat 110 to seal the valve core assembly accommodated therein. The inner cavity of the valve seat 110 forms a valve cavity 111, and a valve port 121 can be formed on the valve seat 110. Of course, in some embodiments, the valve housing 100 further includes a valve seat 120, and the valve seat 120 is mounted on the valve seat 110, and the valve port 121 is formed on the valve seat 120. The nut 200 is installed in the valve housing 100, and the nut 200 may be specifically installed on the housing 130, may also be installed on the valve seat 110, and may also be installed on both the housing 130 and the valve seat 110. The nut 200 and the valve housing 100 can be connected to each other by a connector, interference fit, snap fit, etc. The nut 200 may be injection molded from an engineering plastic. The valve needle 300 is inserted into the valve port 121 and is in clearance fit with the valve port 121, and specifically, the needle-shaped portion 320 of the valve needle 300 is inserted into the valve port 121, and the outer wall surface of the needle-shaped portion 320 is in clearance fit with the inner wall surface of the valve port 121. As described above, when the needle 300 closes the valve port 121, the outer wall surface of the needle 320 and the inner wall surface of the valve port 121 have a certain gap therebetween. Thus, the friction between the valve needle 300 and the valve port 121 can be reduced, and the valve needle 300 is prevented from being stuck.

The valve needle 300 is connected to the valve needle sleeve 400, so that the valve needle 300 and the valve needle sleeve 400 can be integrally formed or can be separately formed. When the valve needle 300 and the valve needle sleeve 400 are formed separately, the two can be fixedly connected by interference fit, welding and the like. Of course, the valve needle 300 and the valve needle sleeve 400 may be directly connected, and an indirect connection via other structural members is also within the scope of the present application. The valve needle sleeve 400 is in clearance fit with the inner cavity of the nut 200, so that the valve needle sleeve 400 is guided and installed in the inner cavity of the nut 200, and meanwhile, the valve needle sleeve 400 is arranged in a clearance with the inner wall surface of the nut 200, so that the friction between the valve needle sleeve 400 and the inner wall surface of the nut 200 is reduced. In one embodiment, the end of the valve stem 500 away from the valve needle 300 is threadedly connected to the nut 200, and the end of the valve stem 500 close to the valve port 121 extends into the valve needle sleeve 400 to be drivingly connected to the valve needle 300. The end of the valve rod 500 away from the valve needle 300 is engaged with the nut 200 by screw threads, and the screw threads have a certain clearance in the radial direction, so that the actuating end 510 of the valve rod 500 close to the valve port 121 can have a certain displacement deviation in the radial direction relative to the nut 200, and the valve rod 500 and the nut 200 can further absorb the concentric deviation to improve the overall coaxiality. The electronic expansion valve further comprises a magnetic ring assembly arranged in the valve housing 100, the magnetic ring assembly comprises a magnetic ring, a fixing plate and a guide rod, the fixing plate is connected with the magnetic ring and the stop rod, and one end of the valve rod 500, which is far away from the valve port 121, penetrates through the middle of the fixing plate. After the electronic expansion valve is powered on, the magnetic ring assembly drives the valve rod 500 to rotate, the valve rod 500 is driven to move up and down through the threaded matching of the valve rod 500 and the nut 200, and the valve needle 300 opens and closes the valve port 121 through the guiding matching of the valve needle sleeve 400 and the inner cavity of the nut 200, so that the flow of the refrigerant is adjusted.

It is understood that the valve needle 300 is inserted into the valve port 121 and is in clearance fit with the valve port 121, and the minimum fit clearance between the valve needle 300 and the inner wall surface of the valve port 121 refers to the minimum clearance between the outer wall surface of the needle portion 320 of the valve needle 300 and the inner wall surface of the valve port 121 when the valve needle 300 is inserted into the valve port 121. The valve rod 500 is in clearance fit with the valve needle sleeve 400, and the fit clearance between the valve rod 500 and the valve needle sleeve 400 refers to a clearance between a wall surface of the valve needle sleeve 400, which is in guiding fit with the valve rod 500, and an outer wall surface of the valve rod 500 when the valve rod 500 is installed in the valve needle sleeve 400.

As shown in fig. 2, the minimum inner diameter of the valve port 121 is set to D1, and the maximum diameter of the valve needle 300 inserted into the valve port 121 is set to D2. As shown in FIG. 4, the inner diameter of the inner cavity of the nut 200 is set to D3, the outer diameter of the needle hub 400 is set to D4, the inner diameter of the first opening 410 of the needle hub 400 is set to D5, and the outer diameter of the actuation end 510 of the valve stem 500 is set to D6. Namely, the minimum fit clearance L1 between the valve needle 300 and the inner wall surface of the valve port 121 is equal to D1-D2; the clearance L2 between the outer wall surface of the valve needle sleeve 400 and the inner wall surface of the nut 200 is equal to D3-D4; the fit clearance L3 between the valve stem 500 and the valve needle sleeve 400 is equal to D5-D6; wherein L2 is greater than L1, and L3 is greater than L1.

The electronic expansion valve of the present invention is configured such that the gap between the outer wall surface of the valve needle cover 400 and the inner wall surface of the nut 200 is larger than the minimum fit gap between the valve needle 300 and the inner wall surface of the valve port 121; and the fitting clearance between the valve stem 500 and the needle cover 400 is larger than the minimum fitting clearance between the needle 300 and the inner wall surface of the valve port 121. When foreign matter is caught between the valve port 121 and the needle 300, even if the needle 300 is deflected, since the fitting gap between the valve stem 500 and the needle cover 400 is larger than the minimum fitting gap between the valve stem 300 and the inner wall surface of the valve port 121, so that a sufficient moving space is provided between the needle cover 400 and the valve stem 500, the needle 300 can bring the entire needle cover 400 to tilt toward the inner wall surface side of the nut 200 with respect to the valve stem 500 without causing the needle cover 400 to be stuck with the valve stem 500 to affect the up-down movement of the needle 300, and when the entire needle cover 400 is brought to tilt toward the inner wall surface side of the nut 200 with respect to the valve stem 500 by the needle 300, the needle cover 400 is not stuck with the nut 200 due to the sufficient moving space provided between the needle cover 400 and the inner wall surface of the nut. When the foreign matter is clamped between the valve needle 300 and the valve port 121, the valve needle 300 can smoothly move in the vertical direction due to the sufficient deviation moving space on the valve rod 500 and the nut 200 side when the valve needle 300 and the valve needle sleeve 400 are wholly inclined, so that the valve needle 300 can be effectively prevented from being stuck, and the influence of eccentricity caused by coaxiality deviation in the valve core assembly assembling process on the valve needle 300 can be avoided.

Specifically, referring to fig. 1, fig. 2 and fig. 4, the valve needle sleeve 400 has a first opening 410 through which the valve rod 500 passes, the valve rod 500 has an action end 510, and the action end 510 of the valve rod 500 is disposed in the valve needle sleeve 400; the fitting clearance between the valve stem 500 and the needle cover 400 is a clearance between the valve stem 500 and the inner wall surface of the first opening 410.

In this embodiment, the actuating end 510 of the valve stem 500 extends into the valve needle sleeve 400 through the first opening 410 to be drivingly connected with the valve needle 300. It can be understood that the electronic expansion valve further comprises a buffer spring 600, the buffer spring 600 is sleeved on the periphery of the action end 510 of the valve rod 500, and the valve rod 500 is in transmission connection with the valve needle 300 through the buffer spring 600. Due to the provision of the buffer spring 600, it is necessary to make a gap between the outer wall surface of the action end 510 of the valve rod 500 and the inner wall surface of the inner cavity of the needle hub 400 large for the buffer spring 600 to be mounted. Therefore, by providing the first opening 410 on the valve needle sleeve 400, the fit clearance between the valve rod 500 and the valve needle sleeve 400 is the clearance between the valve rod 500 and the inner wall surface of the first opening 410, that is, the clearance between the valve rod 500 and the inner wall surface of the first opening 410 is larger than the minimum fit clearance between the valve needle 300 and the inner wall surface of the valve port 121, on one hand, the guide fit between the valve rod 500 and the valve needle sleeve 400 is ensured, and the radial large swing of the valve rod 500 is limited by the first opening 410, on the other hand, the inner wall surface of the first opening 410 of the valve needle sleeve 400 and the outer wall surface of the action end 510 of the valve rod 500 have a sufficient clearance, so that when a foreign object is clamped between the valve needle 300 and the valve port 121, the valve needle sleeve 400 can have a certain radial deviation relative to the valve. To facilitate the installation of the valve stem 500 and the buffer spring 600 into the valve needle sleeve 400, the valve needle 500 is optionally connected with the valve needle sleeve 400 separately.

Further, referring to fig. 1, fig. 2 and fig. 4 again, the valve needle sleeve 400 includes a cylinder body 420 and a limiting ring 430 disposed at an end of the cylinder body 420 away from the valve port 121, the limiting ring 430 is disposed to protrude from an inner wall surface of the cylinder body 420, and a first opening 410 is formed in a middle portion of the limiting ring 430. The retainer ring 430 may be disposed on an end surface of the cartridge body 420 away from the valve port 121. The first opening 410 is formed by the middle of the spacing ring 430 by disposing the spacing ring 430 to protrude from the inner wall surface of the cartridge body 420. Thus, the action end 510 of the valve rod 500 is in clearance fit with the limit ring 430, and the limit ring 430 can limit the valve rod 500 in the radial direction, so that the valve rod 500 can be prevented from greatly shaking in the radial direction, and the running precision of the valve rod 500 is improved; meanwhile, the limiting ring 430 is arranged to provide a sufficient space between the outer wall surface of the actuating end 510 of the valve rod 500 and the inner wall surface of the cylinder body 420 for accommodating the buffer spring 600. Therefore, by ensuring that the clearance between the retainer ring 430 and the actuating end 510 of the valve rod 500 is greater than the minimum fit clearance between the valve needle 300 and the inner wall surface of the valve port 121, the valve needle 300 can smoothly move in the vertical direction while the control accuracy of the valve rod 500 can be ensured, and the valve needle 300 is effectively prevented from being stuck.

In connection with the above-mentioned embodiment in which the valve needle sleeve 400 is provided with the cylinder body 420 and the limit ring 430, further, as shown in fig. 4, the valve needle sleeve 400 is separately connected to the valve needle 300, the peripheral wall of the operation end 510 of the valve rod 500 is provided with the limit flange 520, the limit flange 520 is located in the cylinder body 420, and the limit flange 520 is in limit abutment with the limit ring 430.

In this embodiment, the position-limiting flange 520 is annularly disposed. Of course, it is understood that in other embodiments, the position-limiting flange 520 may be disposed in an arc shape or a block shape, and is not limited specifically. The stop flange 520 may serve to secure the damping spring 600, and may also abut against the stop ring 430 to prevent the actuation end 510 of the valve stem 500 from escaping the valve needle hub 400. In addition, in the present embodiment, the cross-sectional diameter of the needle hub 400 is larger than the cross-sectional diameter of the position-limiting flange 520, so that the friction between the position-limiting flange 520 and the inner wall surface of the needle hub 400 can be reduced, and the valve rod 500 can move smoothly relative to the needle hub 400. When the valve needle sleeve 400 is separated from the valve needle 300, the valve rod 500 can be installed into the cylinder body 420 from the end opposite to the first opening 410, and the position-limiting flange 520 abuts against the position-limiting ring 430, and finally the valve needle sleeve 400 is fixedly connected with the valve needle 300.

In one embodiment, referring again to fig. 4, the fit clearance between the valve stem 500 and the needle hub 400 is greater than the clearance between the needle hub 400 and the inner wall surface of the nut 200. I.e., L3 is greater than L2. When foreign matter is caught between the needle 300 and the valve port 121, the concentric deviation can be absorbed by the gap between the needle 300 and the needle sleeve 400, and the guiding effect between the needle sleeve 400 and the inner wall surface of the nut 200 can be ensured, that is, the accuracy of the whole assembly of the needle 300 can be ensured while preventing the needle 300 from being stuck. Of course, in other embodiments, the fitting clearance between the valve stem 500 and the needle cover 400 may be smaller than the clearance between the needle cover 400 and the inner wall surface of the nut 200. That is, the nut 200 does not guide the needle hub 400, and the nut 200 and the needle hub 400 do not substantially contact with each other, so that even if a concentric deviation occurs between the needle hub 400 and the nut 200 at the time of assembly, the gap between the nut 200 and the needle hub 400 can absorb the concentric deviation.

In fact, as shown in fig. 1 to 3, the valve needle 300 includes a connecting portion 310 and a needle portion 320, the connecting portion 310 is connected with the valve needle sleeve 400, and the needle portion 320 is inserted into the valve port 121 and is in clearance fit with the valve port 121. Further, one end of the needle sleeve 400 close to the valve port 121 is provided with a second opening 440, the connecting portion 310 is installed at the second opening 440 of the needle sleeve 400, and the connecting portion 310 is in interference fit with the needle sleeve 400. In this way, the stability of the connection between the needle hub 400 and the needle 300 can be ensured. In addition, the valve needle sleeve 400 and the valve needle 300 are of two separated structures, so that the injection molding of the valve needle 300 is facilitated, the top surface of the connecting portion 310 can be molded more smoothly, and the friction force between the valve needle 300 and the buffer slide block 700 can be reduced. The needle 300 is inserted into the valve port 121 through the needle portion 320 and is in clearance fit with the valve port 121, and thus a minimum fit clearance between the needle 300 and an inner wall surface of the valve port 121 is a minimum fit clearance between an outer wall surface of the needle portion 320 and an inner wall surface of the valve port 121. The system stability of the whole electronic expansion valve is ensured, and the flow of the refrigerant is easier to adjust.

Further, referring to fig. 3, a straight section 321 is formed at a position of the needle 320 adjacent to the connecting portion 310, a flat section 1211 is formed at a side of the valve port 121 close to the valve needle sleeve 400, and a gap between an outer wall surface of the straight section 321 and an inner wall surface of the flat section 1211 forms a minimum fitting gap. In this way, the gap between the straight section 321 of the valve needle 300 and the flat section 1211 of the valve port 121 is small, and the refrigerant is uniform when flowing through the gap, so that the electronic expansion valve is easier to control the small flow area. So that the gap between the outer wall surface of the straight section 321 and the inner wall surface of the flat section 1211 forms a minimum fit gap, that is, the gap between the outer wall surface of the valve needle sleeve 400 and the inner wall surface of the nut 200 is larger than the gap between the outer wall surface of the straight section 321 and the inner wall surface of the flat section 1211; the fitting clearance between the valve stem 500 and the needle cover 400 is larger than the clearance between the outer wall surface of the straight section 321 and the inner wall surface of the flat-mouth section 1211. The situation that the valve needle 300 moves up and down unsmoothly due to the deflection of the valve needle sleeve 400 when the valve needle 300 is clamped into a foreign object with the minimum gap between the valve port 121 can be avoided, and the operation stability of the electronic expansion valve is further ensured.

In an embodiment, referring to fig. 1, fig. 2 and fig. 4, the electronic expansion valve further includes a buffer spring 600 and a buffer slider 700, the buffer spring 600 and the buffer slider 700 are disposed in an inner cavity of the valve needle sleeve 400, the buffer slider 700 abuts against the valve needle 300, and the valve rod 500 is connected to the buffer slider 700 through the buffer spring 600.

Specifically, the nut 200 is provided with an installation hole extending along the axial direction thereof, and the valve rod 500 is inserted into the installation hole and rotatably connected to the nut 200. The valve rod 500 comprises a guide rod section and a threaded rod section, the mounting hole comprises a guide hole section matched with the guide rod section and a threaded hole section matched with the threaded rod section, interference fit or clearance fit is formed between the guide rod section and the guide hole section, and thread fit is formed between the threaded rod section and the threaded hole section.

The valve needle 300 assembly may be composed of only the valve needle sleeve 400, the valve rod 500, the valve needle 300, the buffer slide 700 and the buffer spring 600, so that the valve needle 300 assembly has fewer parts, thereby achieving a cost saving effect, but is not limited thereto. The valve stem 500, the nut 200 and the valve needle 300 are coaxially arranged. The buffer spring 600 and the buffer slider 700 are both located in the valve needle sleeve 400, the buffer slider 700 is opposite to and spaced from the action end 510 of the valve rod 500, and the buffer spring 600 is located between the buffer slider 700 and the action end 510 of the valve rod 500 to connect the buffer slider 700 and the action end 510 of the valve rod 500. Specifically, the buffer spring 600 is a compression spring. Thus, when the valve rod 500 moves axially relative to the valve needle sleeve 400, the valve rod 500 can drive the buffer slide block 700 to rotate through the buffer spring 600, and the valve needle 300 remains stationary, thereby preventing the valve needle 300 from rotating relative to the valve port 121 to cause abrasion. After the valve rod 500 moves along the axial direction to abut against the valve needle sleeve 400, the valve rod 500 can drive the valve needle 300 to move together through the valve needle sleeve 400, so as to control the opening degree of the valve port 121, that is, control the flow rate of the electronic expansion valve. Optionally, the valve rod 500, the buffer spring 600, the buffer slide 700 and the valve needle sleeve 400 are coaxially arranged, so that good coaxiality of the valve core assembly can be ensured.

In fact, in order to facilitate the installation of the valve rod 300, the buffer spring 600 and the buffer slider 700 into the valve needle sleeve 400, the valve needle sleeve 400 is connected with the valve needle 300 separately. Thus, when the valve needle sleeve 400 and the valve needle 300 are installed, the buffer spring 600, the buffer slide block 700 and the valve rod 500 are installed in the valve needle sleeve 400 from an opening at one end of the valve needle sleeve 400 close to the valve needle 300, and finally the valve needle 300 is fixedly connected with the valve needle sleeve 400.

In the embodiment of the present invention, the cushioning slide 700 abuts against the valve needle 300, so that the cushioning slide 700 is rotatable relative to the valve needle 300, which can prevent the valve needle 300 from rotating relative to the valve port 121 and the valve needle sleeve 400 from rotating relative to the mounting hole of the nut 200, thereby preventing the valve needle 300 and the valve needle sleeve 400 from being worn. The cushion slider 700 may be made of a material having high lubricity, which may reduce the friction between the cushion slider 700 and the valve needle 300, thereby reducing the wear caused by the rotation of the cushion slider 700 relative to the valve needle 300. Alternatively, the bumper slider 700 is made of a non-metallic material, such as, but not limited to, a plastic material for the bumper slider 700. By adopting the non-metallic buffer slider 700, the friction between the buffer slider 700 and the metal valve needle 300 can be reduced, and the abrasion caused by the rotation of the buffer slider 700 relative to the valve needle 300 can be reduced.

In one embodiment, as shown in fig. 1 and 2, the valve housing 100 includes a valve seat 110 and a valve seat 120, the valve seat 110 is provided with a mounting opening 112, the valve seat 120 is mounted at the mounting opening 112, a valve port 121 is formed on the valve seat 120, and a nut 200 is mounted on the valve seat 110. The valve core seat 120 and the valve seat 110 can be connected by welding, so that the sealing reliability of the valve core seat 120 and the valve seat 110 is ensured. In other embodiments, the valve seat 110 may be integrally formed with the valve core seat 120. Through making the nut 200 install in the one side that the installing port 112 was kept away from to the disk seat 110, then compare in installing the nut 200 on shell 130, make the side installation that the nut 200 is close to the valve port 121 more firm, can effectively avoid the nut 200 towards the rocking of the barrel of valve port 121 one side, thereby can avoid appearing eccentric and frictional problem between nut 200 and the case subassembly, and then can avoid the case subassembly to take place the card dead phenomenon because of the axiality when moving in the nut 200, and can effectively reduce electronic expansion valve's whole noise, promote holistic life.

Further, referring to fig. 2 and fig. 4, the electronic expansion valve further includes a connecting piece 800, the valve seat 110 has a positioning plane 113 away from the valve port 121, the nut 200 has a clamping groove 210 and a positioning portion 220, the connecting piece 800 is clamped in the clamping groove 210 and abuts against the positioning plane 113, and the positioning portion 220 is in interference fit with an inner wall surface of the valve seat 110. The connecting piece 800 may be specifically a ring-shaped metal connecting piece 800. The annular metal connecting piece 800 is embedded in the slot 210. The nut 200 may be made of plastic, and may be formed integrally with the annular metal connecting piece 800 by injection molding using engineering resin. The nut 200 is fixed to the positioning plane 113 of the valve seat 110 away from the valve port 121 by the annular metal connecting piece 800, and is in interference fit with the inner wall surface of the valve seat 110 by the positioning part 220. In this way, the annular metal connecting piece 800 limits the axial movement of the nut 200, and the interference fit of the positioning portion 220 limits the circumferential rotation of the nut 200, so that the connection between the nut 200 and the valve seat 110 is more stable, and the nut 200 is prevented from shaking or deflecting due to vibration or coaxial deviation.

In one embodiment, as shown in fig. 1, 2 and 4, the nut 200 has an extension portion extending toward the valve port 121, the extension portion extends to abut against or be close to the valve port 121, and the extension portion is sleeved on the periphery of the needle sleeve 400 and is in guiding fit with the needle sleeve 400 and the needle 300. By making the extension part sleeve locate the periphery of the valve needle sleeve 400 and guiding and matching with the valve needle sleeve 400 and the valve needle 300, the valve needle 300 assembly can be guided by the extension part, so that it is not necessary to additionally provide a guide sleeve or make the valve core seat 120 extend upwards to form a guide sleeve, and then the parts can be reduced, and the whole structure can be simplified. And due to the wall shielding effect of the extension part, the refrigerant can be prevented from directly impacting the valve needle 300, and the noise is reduced. In addition, because the nut 200 is connected the steadiness height, lead to needle 300 through the extension of nut 200, and because valve rod 500 also leads through nut 200, then can be better guarantee valve rod 500, needle cover 400, the axiality of nut 200 three, make holistic axiality high, and then make whole electronic expansion valve's operation precision higher, use more smoothly, further reduce needle 300 card probability of dying.

The present invention further provides a refrigeration device, which includes an electronic expansion valve, and the specific structure of the electronic expansion valve refers to the above embodiments, and since the refrigeration device adopts all the technical solutions of all the above embodiments, the refrigeration device at least has all the beneficial effects brought by the technical solutions of the above embodiments, and details are not repeated herein. The refrigerating equipment can be an air conditioner, a refrigerator, a heat pump water heater or other refrigerating and heating equipment. The electronic expansion valve is able to control the refrigerant medium flow in the refrigeration system.

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.