Electronic expansion valve needle assembly and electronic expansion valve

Abstract

The embodiment of the utility model provides an electronic expansion valve needle assembly and an electronic expansion valve, and relates to the field of valves, and the electronic expansion valve needle assembly comprises a lead screw body, an elastic piece, a valve needle connector and a valve needle body. The lead screw body and the valve needle connector are matched in a sliding mode in the axial direction of the lead screw body and are matched in a rotating mode around the axis of the lead screw body. The elastic piece is arranged between the screw rod body and the valve needle connector and is used for enabling the screw rod body and the valve needle connector to have a trend of being far away from each other; the valve needle body and the valve needle connector are relatively fixed in the axial direction of the valve needle body and are rotatably matched around the axis of the valve needle body. Through the design of the valve needle assembly, noise generated by friction can be reduced, the abrasion speed is reduced, sealing failure is not prone to occurring, and the service life is long.

Description

TECHNICAL FIELD

[0001] The utility model relates to the valve field, specifically, relate to a kind of electronic expansion valve valve needle assembly and electronic expansion valve. BACKGROUND

[0002] Electronic expansion valve is the principle of using stepper motor, rotate by coil drive magnetic rotor, and the rotation of magnetic rotor is converted into the axial movement of valve stem, and the valve stem drives the valve needle connected therewith to rise or fall, controls the flow size of electronic expansion valve.

[0003] The inventor found in research that the electronic expansion valve valve needle assembly of prior art at least has the following shortcomings:

[0004] In prior art, valve stem is directly connected with valve needle, and elastic member is arranged between the valve stem and the valve needle, when the valve stem drives the valve needle to move, the valve stem will rotate itself, and the rotating torque will be directly transmitted to the valve needle through the elastic member, so that the valve needle rotates relative to valve port, friction noise is generated between the valve needle and the valve port, and long-term operation causes wear, leading to sealing failure. UTILITARY MODEL

[0005] The utility model aims to provide an electronic expansion valve valve needle assembly and electronic expansion valve, which can reduce the noise generated by friction, reduce the wear rate, is not prone to sealing failure, has long service life, and the length of the valve needle body is reduced, material is saved, and processing cost is reduced.

[0006] The embodiment of the utility model can be implemented as follows:

[0007] In a first aspect, the utility model provides an electronic expansion valve valve needle assembly, comprising:

[0008] screw rod body, elastic member, valve needle connector and valve needle body;The screw rod body and the valve needle connector are slidably matched in the axial direction of the screw rod body, and the two are rotatably matched around the axis of the screw rod body;The elastic member is arranged between the screw rod body and the valve needle connector, to make the screw rod body and the valve needle connector have the tendency of moving away from each other;The valve needle body and the valve needle connector are relatively fixed in the axial direction of the valve needle body, and the two are rotatably matched around the axis of the valve needle body.

[0009] In an optional embodiment, the valve needle connector is provided with a guide groove, one end of the screw rod body is inserted into the guide groove, and the screw rod body and the guide groove are slidably matched in the groove depth direction of the guide groove;The elastic member is located in the guide groove.

[0010] Based on the above scheme, the screw body slides in the guide groove, and the guide groove is positioned and guided, which facilitates the assembly of the screw body and the valve needle connector and improves the stability of the sliding of the screw body. Meanwhile, the elastic member is in the guide groove, the position of the elastic member is stable, and the elastic member generates elastic deformation in the groove depth direction of the guide groove, which can provide stable elastic force.

[0011] In an optional embodiment, the valve needle connector comprises a guide body and a limiting body, the guide groove is arranged at one end of the guide body, and the limiting body is mounted on the guide body and shields part of the slot of the guide groove; the outer circumferential surface of the screw body is provided with a limiting protrusion, the limiting protrusion is slidably inserted into the guide groove, and the limiting body is used to contact the limiting protrusion to limit the limiting protrusion from being pulled out of the slot of the guide groove.

[0012] The guide body is connected with the valve needle body.

[0013] Based on the above scheme, the screw body is inserted into the guide groove, and when the screw body slides upward, the limiting body is contacted to drive the valve needle connector to rise, and the screw body will not be pulled out of the guide groove, which is safe and reliable to use.

[0014] In an optional embodiment, the limiting body and the guide body are detachably connected.

[0015] Based on the above scheme, the limiting body can be detached from the guide body, and the slot of the guide groove is completely opened, thereby facilitating the installation of the screw body into the guide groove or the pulling out of the screw body from the guide groove.

[0016] In an optional embodiment, the limiting body or the limiting protrusion is provided in a ring structure.

[0017] Based on the above scheme, by providing the ring structure, the limiting body and the limiting protrusion can contact the limiting at any position around, and the limiting effect is good; at the same time, the steps of aligning the limiting body and the limiting protrusion are omitted, the assembly difficulty is reduced, and the assembly efficiency is improved.

[0018] In an optional embodiment, the position of the limiting body relative to the guide body in the groove depth direction of the guide groove is adjustable.

[0019] Based on the above scheme, after the position of the limiting body is adjusted, the stroke of the screw body sliding in the guide groove is correspondingly adjusted, which adapts to different use scenarios and has a wide range of use.

[0020] In an optional embodiment, the electronic expansion valve valve needle assembly further comprises a support bearing, and the valve needle body and the valve needle connector are rotatably connected through the support bearing.

[0021] Based on the above scheme, the valve needle body and the valve needle connector are connected through the support bearing, the rotation resistance between the valve needle connector and the valve needle body is small, the relative rotation of the two is more flexible, the valve needle connector is not easy to drive the valve needle body to rotate even when the screw body is driven to rotate, the valve needle body is not easy to rub against the valve port, noise is not easy to be generated, and failure due to wear is not easy to occur.

[0022] In an optional embodiment, the valve needle body is provided with an assembly groove, the valve needle connector is arranged in the assembly groove, and the support bearing sleeve is arranged outside the valve needle connector and in the assembly groove.

[0023] Based on the above scheme, the internal space of the valve needle body is reasonably utilized, the compactness of the cooperation between the valve needle body and the valve needle connector is improved, the volume is small, the occupied space is small, and small and light design is facilitated.

[0024] In an optional embodiment, the screw body is provided with an integral smooth section and a threaded section, and the threaded section is used for screwing cooperation with the rotating nut.

[0025] Based on the above scheme, the threaded section of the screw body is processed, the processing difficulty of the screw body is low, the processing efficiency is high, and the processing manufacturing cost is low.

[0026] In a second aspect, the utility model provides a kind of electronic expansion valve, and the electronic expansion valve includes:

[0027] The electronic expansion valve needle assembly of any one of the preceding embodiments.

[0028] The beneficial effects of the embodiments of the utility model include, for example:

[0029] As described above, the electronic expansion valve needle assembly provided by the embodiment is connected between the screw body and the valve needle body through the valve needle connector, the screw body is not directly connected with the valve needle body, the torque generated when the screw body rotates is not directly transmitted to the valve needle body, and the valve needle body is not easy to rotate, so that the valve needle body is not easy to rotate relative to the valve port, thereby effectively improving the problem of noise and sealing failure caused by the rotation of the valve needle body relative to the valve port. And since the elastic member is arranged on the valve needle connector, there is no need to process space for positioning the elastic member on the valve needle body, the length of the valve needle body can be reduced, the material required for processing the valve needle body can be saved, the processing difficulty of the valve needle body can be reduced, and the processing manufacturing cost can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those skilled in the art, other related drawings can also be obtained from these drawings without creative labor.

[0031] Figure 1 Figure 1 is a schematic view of an electronic expansion valve needle assembly according to an embodiment of the present application;

[0032] Figure 2 Figure 2 is a sectional view of the electronic expansion valve needle assembly according to the embodiment of the present application;

[0033] Figure 3 Figure 3 is a partial enlarged view of the electronic expansion valve needle assembly according to the embodiment of the present application. Figure 2

[0034] Figure 4 is a schematic view of an icon.

[0035] 100-screw body; 110-first smooth section; 120-threaded section; 130-second smooth section; 140-limiting protrusion; 200-elastic member; 300-valve needle connector; 310-guide body; 311-guide groove; 320-limiting body; 400-valve needle body; 410-assembly groove; 500-supporting bearing. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical scheme in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, but not all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of the present application.

[0038] It should be noted that: similar labels and letters represent similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0039] ​In the description of the utility model, it needs to explain, if the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawing, or the orientation or positional relationship of the product of the invention when it is usually placed, only for the convenience of describing the utility model and simplifying the description, and not indicating or implying that the device or element indicated must have a specific orientation, structure and operation, therefore, it cannot be understood as a limitation on the utility model.

[0040] In addition, if the terms "first", "second" and the like are only used for differentiation, and cannot be understood as indicating or implying relative importance.

[0041] It needs to be explained that the features in the embodiments of the utility model can be combined with each other without conflict.

[0042] In the prior art, the screw rod of the electronic expansion valve assembly is directly connected with the valve needle, a groove accommodating the spring is arranged on the valve needle, and the screw rod is inserted into the groove and contacts the spring. When the screw rod rotates, the valve needle is easily driven to rotate by the spring, which causes the valve needle to rotate relative to the valve port, friction is generated between the two, and problems such as noise and wear failure are easily generated.

[0043] In view of this, the designer provides an electronic expansion valve valve needle assembly which can improve the noise and sealing failure caused by the rotation of the valve needle body 400 relative to the valve port, and improve the operation stability and reliability.

[0044] Please refer to Figure 1 and Figure 2 The embodiment provides an electronic expansion valve valve needle assembly, which comprises a screw rod body 100, an elastic member 200, a valve needle connector 300 and a valve needle body 400. The screw rod body 100 and the valve needle connector 300 are slidably connected in the axial direction of the screw rod body 100, and the two are rotatably connected around the axis of the screw rod body 100; the elastic member 200 is arranged between the screw rod body 100 and the valve needle connector 300, and is used for making the screw rod body 100 and the valve needle connector 300 have a mutual far away tendency; the valve needle body 400 and the valve needle connector 300 are relatively fixed in the axial direction of the valve needle body 400, and the two are rotatably connected around the axis of the valve needle body 400.

[0045] As described above, the working principle of the electronic expansion valve valve needle assembly provided by the embodiment is as follows:

[0046] The screw rod body 100 rotates together under the driving of the magnet, the screw rod body 100 is screwed with the stationary nut, when the screw rod body rotates, the screw rod body 100 reciprocates linearly under the restriction of the nut, thereby driving the valve needle body 400 to reciprocate linearly through the valve needle connector 300 and the elastic member 200, and the valve needle body 400 is used to realize the state switching of the valve port opening and closing. Since the screw rod body 100 is connected with the valve needle body 400 through the valve needle connector 300, the screw rod body 100 is not directly connected with the valve needle body 400, the torque generated when the screw rod body 100 rotates will not be directly transmitted to the valve needle body 400, and the valve needle body 400 is not easy to rotate, so that the problem that the valve needle body 400 rotates relative to the valve port and causes noise and sealing failure is effectively improved. Moreover, since the elastic member 200 is arranged on the valve needle connector 300, the space for machining the positioning elastic member 200 on the valve needle body 400 is not needed, the length of the valve needle body 400 can be reduced, the material required for machining the valve needle body 400 is saved, the machining difficulty of the valve needle body 400 is reduced, and the machining manufacturing cost is reduced.

[0047] The following embodiments illustrate the details of the valve needle assembly of the electronic expansion valve of the application by way of example.

[0048] Please refer to Figure 1 and Figure 2 In the embodiment, optionally, the valve needle assembly of the electronic expansion valve comprises a screw rod body 100, an elastic member 200, a valve needle connector 300, a valve needle body 400 and a support bearing 500. The screw rod body 100 is connected with the valve needle connector 300, the elastic member 200 is arranged between the screw rod body 100 and the valve needle connector 300, the elastic member 200 is in a compressed state, and is used to make the screw rod body 100 and the valve needle connector 300 have a tendency to move away from each other, that is, in the process of the screw rod body 100 descending, the valve needle body 400 can be pressed tightly on the valve port through the elastic force of the elastic member 200, so as to achieve the effect of pre-tightening; at the same time, the design of the elastic member 200 can play a buffering role, so as to avoid damaging the mating threads of the screw rod body 100 and the nut. The valve needle body 400 is connected with the valve needle connector 300 through the support bearing 500. When in operation, the screw rod body 100 rotates and linearly extends and retracts, the screw rod body 100 drives the valve needle connector 300 to reciprocate linearly through the elastic member 200, thereby driving the valve needle body 400 to reciprocate linearly, and the valve needle body 400 is used to adjust the opening and closing of the valve port.

[0049] Please refer to Figure 2Optionally, the screw rod body 100 comprises a first smooth section 110, a threaded section 120 and a second smooth section 130 connected in sequence and in one piece. The outer circumferential surface of the threaded section 120 has a threaded groove for screwing with a nut. Meanwhile, the first smooth section 110 is used for connecting with a magnet, and the end of the second smooth section 130 is provided with a limiting protrusion 140 protruding radially outward. The limiting protrusion 140 can be in an annular structure. The limiting protrusion 140 and the second smooth section 130 are in an integral structure, which has high structural strength and is convenient for processing and manufacturing. Since part of the screw rod body 100 is processed into the threaded section 120, the entire screw rod body 100 does not need to be threaded, which reduces the processing difficulty and the processing cost.

[0050] Please refer to Figure 2 and Figure 3 Optionally, the valve needle connector 300 comprises a guide body 310 and a limiting body 320. The guide body 310 is provided as a stepped shaft. One end of the shaft section with a larger outer diameter of the guide body 310 is provided with a guide groove 311, which can be a circular groove. The end with a smaller outer diameter of the guide body 310 is rotatably connected with the valve needle body 400 through a support bearing 500. The groove circumferential wall of the guide groove 311 is provided with a threaded groove. The limiting body 320 can be in a circular ring structure. The outer circumferential surface of the limiting body 320 is provided with a threaded groove. The limiting body 320 is screwedly matched with the guide groove 311 and shields part of the slot opening of the guide groove 311. Since the limiting body 320 is screwedly matched with the guide groove 311, the connection mode is simple and has a self-locking function. The limiting body 320 and the guide groove 311 are not easy to slide freely in the groove depth direction of the guide groove 311. Meanwhile, the position of the limiting body 320 in the groove depth direction of the guide groove 311 can be adjusted when the limiting body 320 is rotated, which is flexible to use. Moreover, the limiting body 320 can be detached from the slot opening of the guide groove 311, so as to realize detachable cooperation with the guide body 310. When the limiting body 320 is detached, the limiting body 320 loses the shielding of the slot opening of the guide groove 311, which is convenient for inserting the screw rod body 100 into the guide groove 311 and also convenient for pulling out the screw rod body 100 from the guide groove 311.

[0051] When the screw body 100 is assembled with the valve needle connector 300, the limiting body 320 can be first separated from the guide body 310 and sleeved on the second smooth section 130, the limiting body 320 is in abutment with the limiting protrusion 140 and cannot be separated from the end of the second smooth section 130, then the end of the screw body 100 with the limiting protrusion 140 is inserted into the guide groove from the slot of the guide groove 311, the limiting protrusion 140 is located in the guide groove 311, and the limiting body 320 is screwed and fixed with the guide body 310. In this way, when the screw body 100 slides in the depth direction of the guide groove 311, the limiting protrusion 140 is close to the limiting body 320, the two are in abutment, and the limiting protrusion 140 cannot be separated from the guide groove 311. Moreover, the screw body 100 can rotate relative to the guide groove 311 in the guide groove 311.

[0052] It should be understood that, in order to facilitate the sleeving of the limiting body 320 on the second smooth section 130, the limiting body 320 can be provided in a split structure; or the limiting protrusion 140 and the second smooth section 130 are provided in a split structure, and the limiting body 320 is sleeved on the second smooth section 130, and then the limiting protrusion 140 is fixedly connected with the second smooth section 130 by welding or the like.

[0053] It should be understood that, in order to facilitate the sleeving of the limiting body 320 on the second smooth section 130, the limiting body 320 can be provided in a split structure; or the limiting protrusion 140 and the second smooth section 130 are provided in a split structure, and the limiting body 320 is sleeved on the second smooth section 130, and then the limiting protrusion 140 is fixedly connected with the second smooth section 130 by welding or the like.

[0054] It should be understood that, in order to facilitate the sleeving of the limiting body 320 on the second smooth section 130, the limiting body 320 can be provided in a split structure; or the limiting protrusion 140 and the second smooth section 130 are provided in a split structure, and the limiting body 320 is sleeved on the second smooth section 130, and then the limiting protrusion 140 is fixedly connected with the second smooth section 130 by welding or the like.

[0055] It should be understood that, in order to facilitate the sleeving of the limiting body 320 on the second smooth section 130, the limiting body 320 can be provided in a split structure; or the limiting protrusion 140 and the second smooth section 130 are provided in a split structure, and the limiting body 320 is sleeved on the second smooth section 130, and then the limiting protrusion 140 is fixedly connected with the second smooth section 130 by welding or the like. Figure 2 It should be understood that, in order to facilitate the sleeving of the limiting body 320 on the second smooth section 130, the limiting body 320 can be provided in a split structure; or the limiting protrusion 140 and the second smooth section 130 are provided in a split structure, and the limiting body 320 is sleeved on the second smooth section 130, and then the limiting protrusion 140 is fixedly connected with the second smooth section 130 by welding or the like.

[0056] Since the valve needle body 400 and the valve needle connector 300 are connected through the support bearing 500, the rotation resistance between the valve needle connector 300 and the valve needle body 400 is small, the relative rotation of the two is more flexible, the valve needle connector 300 is not easy to drive the valve needle body 400 to rotate even if it rotates under the driving of the screw body 100, the valve needle body 400 is not easy to rub against the valve port, is not easy to produce noise, and is not easy to fail due to wear. In addition, the valve needle connector 300 is inserted into the assembly groove 410, reducing the overall axial size.

[0057] It should be understood that in other embodiments, one of the limiting body 320 and the limiting protrusion 140 can be provided as a ring structure, and the other can be provided as a non-ring structure, and the same can achieve the limiting effect. Alternatively, the limiting body 320 and the limiting protrusion 140 can both be provided as non-ring structures, and the limiting protrusion 140 can contact the limiting body 320 when it leaves the guide groove 311, and the limiting effect can be achieved.

[0058] The electronic expansion valve valve needle assembly provided in the embodiment is characterized in that the screw body 100 and the valve needle body 400 are connected through the valve needle connector 300, and the valve needle connector 300 and the valve needle body 400 are connected through the support bearing 500. When the screw body 100 rotates, the torque generated by the screw body 100 is not directly transmitted to the valve needle body 400, and the valve needle body 400 is not easy to rotate. Even if the torque is transmitted to the valve needle connector 300 to make it rotate, since the rotation resistance between the valve needle connector 300 and the valve needle body 400 is small, the valve needle connector 300 is not easy to drive the valve needle body 400 to rotate when it rotates. In this way, the valve needle body 400 is not easy to rotate relative to the valve port, thereby effectively improving the problem that the noise and sealing failure caused by the rotation of the valve needle body 400 relative to the valve port. At the same time, the elastic member 200 is located in the valve needle connector 300, and there is no need to process a space for positioning the elastic member 200 on the valve needle body 400, which can reduce the length of the valve needle body 400, save the material required for processing the valve needle body 400, reduce the processing difficulty of the valve needle body 400, and reduce the processing manufacturing cost.

[0059] The embodiment further provides an electronic expansion valve including the electronic expansion valve valve needle assembly. Obviously, the electronic expansion valve further includes other components for realizing basic functions, and other components and connection relationships of the electronic expansion valve are not described in detail in the embodiment to avoid repetitive and tedious description, and can be referred to the existing known structure.

[0060] The above merely describes specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An electronic expansion valve valve needle assembly, characterized by, The electronic expansion valve valve needle assembly comprises a screw rod body (100), an elastic member (200), a valve needle connector (300) and a valve needle body (400); the screw rod body (100) is slidably connected with the valve needle connector (300) in the axial direction of the screw rod body (100), and the two are rotatably connected around the axis of the screw rod body (100); the elastic member (200) is arranged between the screw rod body (100) and the valve needle connector (300) to make the screw rod body (100) and the valve needle connector (300) have a mutual far-away tendency; the valve needle body (400) is fixedly connected with the valve needle connector (300) in the axial direction of the valve needle body (400), and the two are rotatably connected around the axis of the valve needle body (400).

2. The electronic expansion valve valve needle assembly according to claim 1, wherein the valve needle connector (300) is provided with a guide groove (311), one end of the screw rod body (100) is inserted into the guide groove (311), the screw rod body (100) is slidably connected with the guide groove (311) in the depth direction of the guide groove (311), and the elastic member (200) is located in the guide groove (311).

3. The electronic expansion valve valve needle assembly according to claim 2, wherein the valve needle connector (300) comprises a guide body (310) and a limiting body (320), the guide groove (311) is arranged at one end of the guide body (310), the limiting body (320) is mounted on the guide body (310) and shields part of the slot of the guide groove (311), the outer circumferential surface of the screw rod body (100) is provided with a limiting protrusion (140), the limiting protrusion (140) is slidably inserted into the guide groove (311), and the limiting body (320) is used to contact the limiting protrusion (140) to limit the limiting protrusion (140) from being pulled out of the slot of the guide groove (311); the guide body (310) is connected with the valve needle body (400).

4. The electronic expansion valve valve needle assembly according to claim 3, wherein the limiting body (320) is detachably connected with the guide body (310).

5. The electronic expansion valve valve needle assembly according to claim 3, wherein the limiting body (320) or the limiting protrusion (140) is provided in the form of a ring structure.

6. The electronic expansion valve valve needle assembly according to claim 3, wherein the position of the limiting body (320) relative to the guide body (310) in the depth direction of the guide groove (311) is adjustable.

7. The electronic expansion valve valve needle assembly according to claim 1, further comprising a support bearing (500), and the valve needle body (400) and the valve needle connector (300) are rotatably connected through the support bearing (500).

8. The electronic expansion valve valve needle assembly according to claim 7, wherein the support bearing (500) is arranged between the valve needle body (400) and the valve needle connector (300). ​ ​ ​ ​ ​ ​ ​ ​ The valve needle body (400) is provided with a fitting groove (410), the valve needle connector (300) is arranged in the fitting groove (410), and the support bearing (500) is sleeved outside the valve needle connector (300) and arranged in the fitting groove (410).

9. The electronic expansion valve valve needle assembly of claim 1, wherein: The screw rod body (100) is provided with a smooth section and a threaded section (120) in one piece, and the threaded section (120) is used for screwing cooperation with a rotating nut.

10. An electronic expansion valve characterized by The electronic expansion valve comprises: The electronic expansion valve valve needle assembly of any one of claims 1-9.

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