Electronic expansion valve

Abstract

The utility model relates to an electronic expansion valve which comprises a fixing base assembly, a valve body assembly and a valve body assembly. The bearing is mounted in the mounting hole; the screw rod is arranged on the bearing in a penetrating manner, and the screw rod can rotate around the axial direction of the screw rod; wherein the inner ring of the bearing is in clearance fit with the screw rod; and / or the outer ring of the bearing is in clearance fit with the inner wall of the mounting hole. According to the electronic expansion valve, the problem that the rotation friction force of the bearing and the rotation friction force of the screw are increased due to the fact that the bearing is prone to extrusion deformation is solved.

Description

Technical Field

[0001] The present application relates to the technical field of electronic expansion valves, and in particular to an electronic expansion valve. Background Art

[0002] The electronic expansion valve is installed in the air conditioning system to cut off or connect the circulation of the refrigerant. The electronic expansion valve usually includes a valve seat assembly, a valve core, a screw and a nut, wherein the valve seat assembly has a valve cavity, one end of the valve cavity is provided with a valve port, the motor drives the screw to rotate, the nut is sleeved on the outside of the screw and cooperates with the screw thread, thereby converting the rotation of the screw into axial movement, and the valve core is connected to the nut, so that the nut drives the valve core to move toward the valve port to block the valve port, or the nut drives the valve core to move away from the valve port to open the valve port.

[0003] The electronic expansion valve is usually also equipped with a bearing, the outer ring of the bearing is fixed to the valve seat assembly, and the inner ring of the bearing is fixed to the outer circumference of the screw, so that the rotation of the screw is more stable. However, since the inner ring and the outer ring of the bearing are both fixed, the bearing is easily squeezed and deformed as the screw rotates, the rotational friction of the bearing increases, and the rotational resistance of the screw increases. Utility Model Content

[0004] Based on this, it is necessary to provide an electronic expansion valve to solve the problem that the bearing is prone to extrusion deformation, which leads to an increase in the rotational friction of the bearing and further increases the rotational resistance of the screw.

[0005] An electronic expansion valve comprises: a fixed seat assembly, the fixed seat assembly is provided with a mounting hole; a bearing, the bearing is mounted in the mounting hole; a screw rod, the screw rod is passed through the bearing, and the screw rod can rotate around its own axis; wherein the inner ring of the bearing is in clearance with the screw rod; and / or the outer ring of the bearing is in clearance with the inner wall of the mounting hole.

[0006] In one embodiment, the outer circumference of the screw is formed with a first limiting step and a second limiting step spaced apart along the axial direction of the screw, and the first limiting step and the second limiting step are respectively used to stop at both ends of the bearing to limit the axial movement of the screw. It can be understood that such a setting can prevent the screw from axially moving relative to the bearing.

[0007] In one embodiment, the electronic expansion valve further comprises an elastic support member, one end of the elastic support member is connected to the first limit step, and the other end is connected to the side of the bearing away from the second limit step. It can be understood that due to the clearance fit between the inner ring of the bearing and the screw, the screw can move axially relative to the bearing to generate an axial gap, and the provision of the elastic support member can prevent the screw from moving axially relative to the bearing, thereby eliminating the axial gap between the screw and the bearing.

[0008] In one embodiment, the elastic support member is configured as a spring. It is understandable that such a configuration facilitates the assembly of the elastic support member and the screw rod.

[0009] In one embodiment, at least one of the first limiting step and the second limiting step is detachably connected to the screw rod. It is understandable that such a configuration facilitates the assembly of the screw rod and the bearing.

[0010] In one embodiment, the electronic expansion valve further includes a retaining ring, the first limiting step is configured as a retaining ring sleeved on the outer periphery of the screw, the outer peripheral wall of the screw is provided with a matching groove, the retaining ring is provided with an assembly groove corresponding to the matching groove, the retaining ring is at least partially received in the matching groove, and the other part is received in the assembly groove, and the elastic support has a tendency to push the retaining ring to move along the axial direction of the screw in a direction away from the bearing, so that the inner wall of the assembly groove and the inner wall of the matching groove cooperate to clamp the retaining ring. It can be understood that, in such a configuration, the retaining ring can be detachably installed on the outer periphery of the screw through the cooperation of the retaining ring and the elastic support, so that the retaining ring is convenient to disassemble and assemble.

[0011] In one embodiment, the first limiting step and / or the second limiting step are respectively annular. It is understandable that such an arrangement enables the screw rod to be subjected to a more uniform axial force around it.

[0012] In one embodiment, a mounting groove is formed in the mounting hole, the bearing is mounted in the mounting groove, and the two ends of the bearing along its own axial direction respectively abut against the two side walls of the mounting groove that are arranged opposite to each other. It can be understood that, in this arrangement, the bearing can be axially limited in the mounting hole, and because the two ends of the bearing abut against the two side walls of the mounting groove respectively, there will be no axial gap between the bearing and the two side walls of the mounting groove, which is conducive to the stable installation of the screw.

[0013] In one embodiment, the electronic expansion valve further comprises a mounting seat, the mounting hole comprises a first section and a second section which are connected, the inner diameter of the first section is larger than the inner diameter of the second section, so that a stop step is formed at the connection between the first section and the second section, the mounting seat is fixedly connected to the inner wall of the first section, and a mounting groove is formed between the mounting seat and the stop step. It can be understood that such a configuration facilitates the assembly of the fixed seat assembly and the bearing.

[0014] In one embodiment, the screw is fixedly connected to the inner ring of the bearing, and the outer ring of the bearing is in clearance with the inner wall of the mounting hole. It is understandable that such a configuration enables the screw to drive the inner ring of the bearing to rotate without axially moving relative to the bearing, that is, without axially moving in the mounting hole.

[0015] Compared with the prior art, the electronic expansion valve provided in the present application has a bearing installed in a mounting hole and a screw rod passing through the bearing. Therefore, the bearing can limit the position of the screw rod, so that the screw rod rotates more smoothly.

[0016] Furthermore, due to the clearance fit between the inner ring of the bearing and the screw, and / or the clearance fit between the outer ring of the bearing and the inner wall of the mounting hole, an accommodating space is formed on at least one side of the inner wall or outer wall of the bearing, thereby preventing the screw and the mounting hole from clamping the bearing too tightly and causing deformation of the bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 A cross-sectional view of an electronic expansion valve according to an embodiment of the present application;

[0019] Figure 2 for Figure 1 A partial view of the .

[0020] Figure numerals: 10, fixed seat assembly; 19, mounting hole; 191, mounting groove; 192, first section; 193, second section; 194, stop step; 21, screw; 212, matching groove; 213, first limiting step; 214, second limiting step; 22, nut; 25, retaining ring; 261, assembly groove; 27, elastic support member; 30, valve core; 40, bearing; 50, mounting seat. DETAILED DESCRIPTION

[0021] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0022] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0023] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0024] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediate medium. Moreover, a first feature being “above”, “above” or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below” or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0025] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more related listed items.

[0026] See also Figure 1-Figure 2 The present application provides an electronic expansion valve, which includes: a fixed seat assembly 10, which is provided with a mounting hole 19; a bearing 40, which is installed in the mounting hole 19; a screw 21, which is passed through the bearing 40 and can rotate circumferentially around its own axis; wherein the inner ring of the bearing 40 is in clearance fit with the screw 21; and / or; the outer ring of the bearing 40 is in clearance fit with the inner wall of the mounting hole 19. The electronic expansion valve also includes a nut 22 and a valve core 30, wherein the nut 22 is sleeved on the end of the screw 21 and is threadedly matched with the screw 21, and the rotation of the screw 21 is converted into the axial movement of the nut 22. The nut 22 drives the valve core 30 to move. The movement stroke of the nut 22 is easier to control, thereby facilitating the control of the movement stroke of the valve core 30.

[0027] In the electronic expansion valve provided in the present application, since the bearing 40 is fixedly installed in the mounting hole 19 and the screw 21 passes through the bearing 40, the bearing 40 can limit the screw 21, so that the screw rotates more smoothly.

[0028] Furthermore, due to the clearance fit between the inner ring of the bearing 40 and the screw 21, and / or the clearance fit between the outer ring of the bearing 40 and the inner wall of the mounting hole 19, an accommodating space is formed on at least one side of the inner wall or the outer wall of the bearing, thereby preventing the screw 21 and the mounting hole 19 from clamping the bearing 40 too tightly and causing deformation of the bearing 40, thereby preventing an increase in the rotational friction of the bearing and the rotational friction of the screw.

[0029] In one embodiment, as shown in the figure, a mounting groove 191 is formed in the mounting hole 19 , and the bearing 40 is installed in the mounting groove 191 , and the two ends of the bearing 40 along its own axial direction respectively abut against the two side walls of the mounting groove 191 which are oppositely arranged.

[0030] By providing the mounting groove 191 , the bearing 40 can be axially limited in the mounting hole 19 .

[0031] Specifically, the electronic expansion valve also includes a mounting seat 50, and the mounting hole 19 includes a first section 192 and a second section 193 that are connected. The inner diameter of the first section 192 is larger than the inner diameter of the second section 193, so that a stop step 194 is formed at the connection between the first section 192 and the second section 193, and the mounting seat 50 is fixedly connected to the inner wall of the first section 192, and a mounting groove 191 is formed between the mounting seat 50 and the stop step 194.

[0032] When assembling the fixed seat assembly 10 and the bearing 40 , the bearing 40 can be first inserted from the first section 192 with a larger inner diameter and stopped at the stop step 194 ; then the mounting seat 50 is installed into the first section 192 and fixedly connected to the inner wall of the first section 192 .

[0033] There are two embodiments of the axial limiting form of the screw rod 21 relative to the bearing 40 as follows.

[0034] Embodiment 1:

[0035] like Figure 1 and Figure 2 As shown, the outer periphery of the screw 21 is formed with a first limiting step 213 and a second limiting step 214 spaced apart along the axial direction of the screw 21 . The first limiting step 213 and the second limiting step 214 are respectively stopped at both ends of the bearing 40 to limit the axial movement of the screw 21 .

[0036] By providing the first limiting step 213 and the second limiting step 214 , the screw rod 21 can only rotate circumferentially around its own axis, but cannot move along its own axis relative to the bearing 40 .

[0037] Furthermore, the electronic expansion valve further comprises an elastic support member 27 , one end of the elastic support member 27 is connected to the first limiting step 213 , and the other end is connected to a side of the bearing 40 away from the second limiting step 214 .

[0038] By setting the elastic support member 27, the elastic support member 27 is compressed between the first limiting step 213 and the bearing 40, so that it has an elastic force, and the elastic force acts on the bearing 40 and points to the second limiting step 214, so that the bearing 40 can be close to the second limiting step 214, so that the axial clearance between the screw 21 and the bearing 40 can be eliminated, and at the same time, the elastic force acts on the first limiting step 213 and points to the first limiting step 213, so as to provide an upward supporting force for the screw 21, so as to play a role in axially limiting the screw 21 downward, and prevent the screw 21 from moving axially downward. The electronic expansion valve of this embodiment is provided with a coil and a rotor, the rotor is connected to the screw 21, and the coil drives the rotor to rotate when the screw 21 is driven to rotate, and the elastic support member 27 is set as a compression spring, and its elastic force is greater than the driving force of the coil, so that under the drive of the coil, the screw will not overcome the elastic force of the elastic support member 27 and move axially downward.

[0039] The elastic support member 27 is configured as a spring, and the spring is sleeved on the outer periphery of the screw rod 21. This facilitates the assembly of the elastic support member 27 and the screw rod 21.

[0040] The first limiting step 213 and the second limiting step are respectively annular, so that the contact area between the first limiting step and the spring can be increased, so that the surrounding of the screw rod 21 is subjected to a more uniform axial force.

[0041] Furthermore, at least one of the first limiting step 213 and the second limiting step 214 is detachably connected to the screw rod 21 .

[0042] Since the screw rod 21 needs to pass through the bearing 40, the first limiting step 213 is made to be detachably connected to the screw rod 21. When the screw rod and the bearing 40 are assembled, one end of the screw rod 21 used to install the first limiting step 213 can be passed through the bearing 40 first, and then the first limiting step 213 can be installed on the screw rod 21.

[0043] Similarly, the second limiting step 214 is made to be detachably connected to the screw rod 21. When the screw rod 21 and the bearing 40 are assembled, the end of the screw rod 21 used to install the second limiting step 214 can be passed through the bearing 40 first, and then the second limiting step 214 can be installed on the screw rod 21.

[0044] That is, in this way, it is convenient to assemble the screw rod 21 and the bearing 40 .

[0045] Furthermore, the electronic expansion valve also includes a retaining ring 25, and the first limiting step 213 is configured as a limiting ring sleeved on the outer periphery of the screw 21. The outer peripheral wall of the screw 21 is provided with a matching groove 212, and the first limiting step 213 is provided with an assembly groove 261 corresponding to the matching groove 212. The retaining ring 25 is at least partially received in the matching groove 212, and the other part is received in the assembly groove 261. The elastic support member 27 has a tendency to push the limiting ring to move along the axial direction of the screw 21 away from the bearing 40, so that the inner wall of the assembly groove 261 cooperates with the inner wall of the matching groove 212 to clamp the retaining ring 25.

[0046] Since at least part of the retaining ring 25 is received in the matching groove 212, and the other part is received in the assembly groove 261, the elastic support member 27 can apply elastic force to the limiting ring, so that the limiting ring pushes the retaining ring 25 to abut against one side edge of the matching groove 212 through the inner wall of the assembly groove 261, so that the retaining ring is limited between the screw rod 21 and the retaining ring along the axial direction of the screw rod 21. When the retaining ring needs to be removed from the screw rod 21, it is only necessary to move the retaining ring toward the elastic support member 27, so that the retaining ring is separated from the retaining ring 25. That is, in this embodiment, the retaining ring is detachably mounted on the outer periphery of the screw rod 21 through the cooperation of the retaining ring 25 and the elastic support member 27. This makes it convenient to disassemble and assemble the retaining ring.

[0047] Embodiment 2:

[0048] The screw rod 21 is fixedly connected to the inner ring of the bearing 40 , and the outer ring of the bearing 40 is clearance-matched with the inner wall of the mounting hole 19 .

[0049] Since the bearing 40 is installed in the mounting hole 19, by fixing the screw 21 to the inner ring of the bearing 40, the screw 21 can drive the inner ring of the bearing 40 to rotate without axially moving relative to the bearing 40, that is, without axially moving in the mounting hole 19.

[0050] Specifically, the screw rod 21 may be connected to the inner ring of the bearing 40 by snapping, or may be connected to the inner ring of the bearing 40 by screws.

[0051] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0052] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the scope of patent protection of the present application shall be subject to the attached claims.

Claims

1. An electronic expansion valve, It is characterized in that The electronic expansion valve comprises: A fixing seat assembly (10), wherein the fixing seat assembly (10) is provided with a mounting hole (19); A bearing (40), wherein the bearing (40) is installed in the installation hole (19); A screw (21), wherein the screw (21) is inserted into the bearing (40) and is capable of rotating circumferentially around its own axis; The inner ring of the bearing (40) is in clearance fit with the screw (21); and / or the outer ring of the bearing (40) is in clearance fit with the inner wall of the mounting hole (19).

2. The electronic expansion valve according to claim 1, It is characterized in that The outer periphery of the screw rod (21) is formed with a first limiting step (213) and a second limiting step (214) which are arranged at intervals along the axial direction of the screw rod (21); the first limiting step (213) and the second limiting step (214) are respectively used to stop at two ends of the bearing (40) to limit the axial movement of the screw rod (21).

3. The electronic expansion valve according to claim 2, It is characterized in that The electronic expansion valve further comprises an elastic support member (27), one end of the elastic support member (27) being connected to the first limiting step (213), and the other end being connected to a side of the bearing (40) facing away from the second limiting step (214).

4. The electronic expansion valve according to claim 3, It is characterized in that The elastic support member (27) is configured as a spring.

5. The electronic expansion valve according to claim 3, It is characterized in that The electronic expansion valve further comprises a retaining ring (25); the first limiting step (213) is configured as a retaining ring sleeved on the outer circumference of the screw rod (21); a matching groove (212) is provided on the outer circumferential wall of the screw rod (21); the retaining ring is provided with an assembly groove (261) corresponding to the matching groove (212); the retaining ring (25) is at least partially received in the matching groove (212), and the other part is received in the assembly groove (261); The elastic support member (27) has a tendency to push the limiting ring to move along the axial direction of the screw rod (21) in a direction away from the bearing (40), so that the inner wall of the assembly groove (261) cooperates with the inner wall of the matching groove (212) to clamp the retaining ring (25).

6. The electronic expansion valve according to claim 2, It is characterized in that At least one of the first limiting step (213) and the second limiting step (214) is detachably connected to the screw rod (21).

7. The electronic expansion valve according to claim 2, It is characterized in that The first limiting step (213) and / or the second limiting step (214) are respectively ring-shaped.

8. The electronic expansion valve according to claim 1, It is characterized in that A mounting groove (191) is formed in the mounting hole (19), the bearing (40) is mounted in the mounting groove (191), and the two ends of the bearing (40) along its own axial direction respectively abut against two side walls of the mounting groove (191) that are arranged opposite to each other.

9. The electronic expansion valve according to claim 8, It is characterized in that The electronic expansion valve also includes a mounting seat (50), the mounting hole (19) includes a first section (192) and a second section (193) that are connected to each other, the inner diameter of the first section (192) is larger than the inner diameter of the second section (193), so that a stop step (194) is formed at the connection between the first section (192) and the second section (193), the mounting seat (50) is fixedly connected to the inner wall of the first section (192), and the mounting groove (191) is formed between the mounting seat (50) and the stop step (194).

10. The electronic expansion valve according to claim 1, It is characterized in that The screw rod (21) is fixedly connected to the inner ring of the bearing (40), and the outer ring of the bearing (40) is clearance-matched with the inner wall of the mounting hole (19).

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