Thermal expansion valve
By setting a rolling member between the second adjustment unit and the first adjustment unit of the thermal expansion valve, changing the contact method from rotating hard friction to rolling friction, solving the problem of serious wear of the adjustment bolt and the spring seat, and extending the thermal expansion valve service life.
Patent Information
- Application Number
- CN202421253579.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-04
- Publication Date
- 2025-01-10
- Estimated Expiration
- 2034-06-04
AI Technical Summary
The existing thermal expansion valve has severe wear between the adjustment bolts and the spring seat, resulting in a shortened service life.
A rolling member is provided between the second adjusting unit and the first adjusting unit to reduce the contact area and change the contact mode from rotating hard friction to rolling friction, reducing wear.
It extends the service life of the adjustment bolts and thermal expansion valves, and reduces the occurrence of structural damage.
Smart Images
Figure CN222334642U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of refrigeration systems, in particular to a thermal expansion valve. Background Art
[0002] Thermostatic expansion valve is a key component in controlling the superheat of the system in the refrigeration system. It is generally installed between the condenser and the evaporator to achieve the pressure drop from the condensing pressure to the evaporating pressure.
[0003] The thermal expansion valve usually includes a diaphragm. The thermal expansion valve usually senses the temperature change at the end of the evaporator through a temperature-sensing package. After sensing the temperature change, the filling in the temperature-sensing package will produce a pressure change provided to the diaphragm. The pressure change causes the diaphragm to deform and then drives the valve stem to move up and down through the transmission part set under the diaphragm, thereby adjusting the superheat of the system. Therefore, the actual movement stroke of the valve stem is changed by adjusting the position of the transmission part, thereby changing the ability of the thermal expansion valve to adjust the superheat. In the related art, the transmission part is generally connected to one end of the spring seat through a spring, and the other end of the spring seat is abutted against the adjusting bolt. The spring seat is pushed to move by turning the adjusting bolt, thereby changing the position of the transmission part. However, the adjusting bolt and the spring seat are severely worn, prone to breakage, and shortened in service life. Utility Model Content
[0004] Based on this, the utility model provides a thermal expansion valve to solve the above technical problems.
[0005] A thermal expansion valve comprises: a valve body assembly, comprising a valve body and an adjustment seat, the valve body and the adjustment seat are connected, the valve body has a first cavity, the adjustment seat has a second cavity, the first cavity and the second cavity are connected; an adjustment assembly, comprising a transmission part, a first adjustment unit and a second adjustment unit, one side of the transmission part abuts against the diaphragm of the thermal expansion valve, and the other side abuts against the first adjustment unit, an end of the second adjustment unit close to the first adjustment unit is provided with a rolling element, the rolling element abuts against the first adjustment unit, when the second adjustment unit is displaced along the axial direction of the second cavity, the second adjustment unit drives the first adjustment unit to be displaced in the axial direction of the first cavity, so as to push the transmission part and change the position of the diaphragm.
[0006] In this way, the first cavity in the valve body assembly and the second cavity in the adjustment seat are used to facilitate the arrangement of various internal components. One end of the second adjustment unit is in contact with the first adjustment unit. When the second adjustment unit moves, it can push the first adjustment unit to move synchronously. The first adjustment unit is connected to the transmission part, so when the first adjustment unit moves, it drives the transmission part to move, thereby playing a role in adjusting the diaphragm, increasing the pressure below the diaphragm, and thus playing a role in adjusting the superheat. In this process, since the second adjustment unit and the first adjustment unit are always subjected to hard friction through rotation, the two contact surfaces are prone to wear. In this application, a rolling element is arranged between the second adjustment unit and the first adjustment unit, and the rolling element makes the first adjustment unit and the second adjustment unit have rolling friction, thereby reducing the wear between the two, avoiding structural damage, and extending the service life of the second adjustment unit and the first adjustment unit and even the thermal expansion valve.
[0007] In one embodiment, the second adjustment unit is configured as an adjustment bolt, which is disposed in the second cavity and threadably engaged with a cavity wall of the second cavity so as to move along the second cavity.
[0008] In one embodiment, the rolling element is configured as a spherical structure or a cylindrical structure.
[0009] In one embodiment, a mounting groove is formed at one end of the adjusting bolt close to the first adjusting unit, and the rolling element is disposed in the mounting groove.
[0010] In one embodiment, the depth of the mounting groove is H, and the radius of the rolling element is R, satisfying: H≥R.
[0011] In one embodiment, the first adjustment unit includes a valve stem, a spring and a spring seat, the valve stem is connected to the transmission part, the spring is sleeved on the outer peripheral side of the valve stem, and one end of the spring abuts against the transmission part, and the other end abuts against the spring seat, and the side of the spring seat facing away from the spring abuts against the rolling element.
[0012] In one embodiment, the portion where the spring seat abuts the adjusting bolt is a conical section, and the outer diameter of the conical section gradually increases along the direction approaching the transmission portion. The axis of the adjusting bolt is perpendicular to the outer peripheral wall of the conical section, and the rolling element abuts against the outer peripheral edge of the conical section close to one end of the spring.
[0013] In one embodiment, the spring seat further includes a connecting section, the connecting section is connected to the conical section, a step is provided on an outer peripheral side of the connecting section, and at least a portion of the spring abuts against the step.
[0014] In one embodiment, a guide column is constructed in the first cavity, a guide hole is axially opened in the guide column, the valve stem is inserted into the guide hole, and the spring seat is movably connected to the outer peripheral side of the guide column.
[0015] In one embodiment, the transmission part, the valve stem, the guide column and the spring seat are all coaxially arranged.
[0016] Compared with the prior art, the utility model sets a rolling member between the second adjusting unit and the first adjusting unit. By setting the rolling member, the rolling member can reduce the contact area between the second adjusting unit and the first adjusting unit. At the same time, the first adjusting unit and the second adjusting unit are converted into rolling friction, thereby reducing the wear between the two, avoiding structural damage, and extending the service life of the adjusting bolt, the first adjusting unit and even the thermal expansion valve. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 A cross-sectional view of one embodiment of the thermal expansion valve provided by the utility model;
[0018] Figure 2 This is a schematic structural diagram of one embodiment of the thermal expansion valve provided by the utility model.
[0019] The symbols in the figure mean the following:
[0020] 100. Thermal expansion valve; 10. Valve body assembly; 11. Valve body; 111. First cavity; 112. Guide column; 113. Guide hole; 114. Adjustment cavity; 12. Adjustment seat; 121. Second cavity; 20. Adjustment assembly; 21. Transmission unit; 22. First adjustment unit; 221. Valve stem; 222. Spring; 223. Spring seat; 2231. Conical section; 2232. Connecting section; 2233. Step; 23. Second adjustment unit; 231. Mounting groove; 24. Rolling element; 30. Diaphragm; 40. Temperature sensing package. 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 mechanism is referred to as being "fixed to" or "set on" another mechanism, it may be directly on the other mechanism or there may be a central mechanism. When a mechanism is considered to be "connected to" another mechanism, it may be directly connected to the other mechanism or there may be a central mechanism 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] The utility model provides a thermal expansion valve 100, which reduces the contact area between the second adjustment unit 23 and the spring seat 223 through the rolling element 24, thereby reducing the occurrence of wear.
[0027] See also Figure 1-2A regulating chamber 114 is provided in the thermal expansion valve 100, and a temperature sensing package 40 is connected to the regulating chamber 114. A diaphragm 30 is provided in the regulating chamber 114. The thermal expansion valve 100 senses the temperature change at the end of the evaporator through the temperature sensing package 40. After sensing the temperature change, the filling material in the temperature sensing package 40 will generate a pressure change provided to the diaphragm 30. The pressure change causes the diaphragm 30 to deform and then drives the valve stem 221 to move up and down through the transmission part 21 provided under the diaphragm 30, thereby adjusting the superheat of the system.
[0028] The thermal expansion valve 100 includes a valve body assembly 10 and an adjustment assembly 20. The valve body assembly 10 includes a valve body 11 and an adjustment seat 12. The valve body 11 and the adjustment seat 12 are connected. The valve body 11 has a first cavity 111, and the adjustment seat 12 has a second cavity 121. The first cavity 111 and the second cavity 121 are communicated. The adjustment assembly 20 includes a transmission part 21, a first adjustment unit 22, a second adjustment unit 23 and a rolling element 24. One side of the transmission part 21 abuts against the diaphragm 30 of the thermal expansion valve 100, and the other side is connected to the first adjustment unit 22. The second adjustment unit 23 is arranged in the second cavity 121 and is threadedly matched with the cavity wall of the second cavity 121 to move along the second cavity 121. A rolling element 24 is provided at one end of the second adjustment unit 23. The rolling element 24 abuts against the first adjustment unit 22 located in the first cavity 111, and pushes the first adjustment unit 22 to move along the axis of the first cavity 111, and drives the transmission part 21 to move synchronously.
[0029] In this way, the first cavity 111 in the valve body assembly 10 and the second cavity 121 in the adjustment seat 12 are used to facilitate the arrangement of various internal components. Since the second adjustment unit 23 is threadedly matched with the adjustment seat 12, the second adjustment unit 23 can move relative to the adjustment seat 12 by rotation. One end of the second adjustment unit 23 abuts against the first adjustment unit 22. When moving, the second adjustment unit 23 can push the first adjustment unit 22 to move synchronously. The first adjustment unit 22 is connected to the transmission part 21, so when the first adjustment unit 22 moves, it drives the transmission part 21 to move, thereby playing the role of adjusting the diaphragm 30. During this process, since the second adjusting unit 23 and the first adjusting unit 22 are always subjected to rotational hard friction, the two contact surfaces are prone to wear. In the present application, a rolling member 24 is arranged between the second adjusting unit 23 and the first adjusting unit 22, so that rolling friction is generated between the first adjusting unit 22 and the second adjusting unit 23 through the rolling member. In this way, the contact area between the second adjusting unit 23 and the first adjusting unit 22 can be reduced, thereby reducing the wear between the two, avoiding structural damage, and extending the service life of the second adjusting unit 23 and the first adjusting unit 22 and even the thermal expansion valve 100.
[0030] Preferably, in this embodiment, the second adjustment unit 23 is configured as an adjustment bolt, which is disposed in the second cavity 121 and is threadedly engaged with the cavity wall of the second cavity 121 to move along the second cavity 121. The bolt structure moves accurately and stably, with low cost, and accurate movement of the adjustment bolt can be achieved by rotation.
[0031] The rolling element 24 is configured as a spherical structure or a cylindrical structure, which can reduce the wear between the first adjusting unit 22 and the second adjusting unit 23 .
[0032] Further, taking the rolling element 24 as a spherical structure as an example, a mounting groove 231 is provided at one end of the second adjustment unit 23 close to the first adjustment unit 22, and the rolling element 24 is disposed in the mounting groove 231. The mounting groove 231 can accommodate the rolling element 24, and the groove wall of the mounting groove 231 can limit the rolling element 24 to prevent the rolling element 24 from escaping from the preset position, resulting in the problem that the movement of the second adjustment unit 23 cannot be smoothly transmitted to the first adjustment unit 22.
[0033] Furthermore, the depth of the installation groove 231 is H, and the radius of the rolling element 24 is R, which satisfies: H ≥ R. In this way, the limiting effect of the installation groove 231 on the rolling element 24 is ensured, and the rolling element 24 is further prevented from escaping from the installation groove 231 .
[0034] The first regulating unit 22 includes a valve stem 221, a spring 222 and a spring seat 223. The valve stem 221 is connected to the transmission part 21. The spring 222 is sleeved on the outer peripheral side of the valve stem 221. One end of the spring 222 abuts against the transmission part 21, and the other end abuts against the spring seat 223. The side of the spring seat 223 facing away from the spring 222 abuts against the rolling element 24. The spring 222 abuts against the transmission part 21, and can always give a preset pressure to the transmission part 21 and the diaphragm 30 connected to the transmission part 21. The rolling element 24 drives the spring 222 abutting against the spring seat 223 by pushing the spring seat 223, and moves the transmission part 21 through the spring 222. The transmission part 21 changes the pressure below the diaphragm, thereby playing a role in adjusting the superheat.
[0035] In other embodiments, the first adjustment unit 22 may also be configured as other structures, for example, the spring seat 223 is directly connected to the valve stem 221 , and the rolling element 24 can directly drive the valve stem 221 to move by pushing the spring seat 223 , and is not limited to the above embodiments.
[0036] The part where the spring seat 223 abuts against the second adjustment unit 23 is a tapered section 2231, and the outer diameter of the tapered section 2231 gradually increases in the direction close to the transmission part 21. In this way, the abutment between the tapered section 2231 and the spring 222 will be more stable, and the outer side wall of the tapered section 2231 is an inclined surface, which is convenient for abutting against the rolling element 24.
[0037] It can be understood that in other embodiments, the spring seat 223 can also be configured as a cylindrical structure, a truncated cone structure, a prismatic structure, etc., and is not limited to the above-mentioned conical structure.
[0038] Preferably, in this embodiment, the axis of the second adjustment unit 23 is perpendicular to the tapered section 2231. Thus, as the second adjustment unit 23 moves, its moving path is also perpendicular to the outer peripheral wall of the tapered section 2231, and its driving force can fully act on the tapered section 2231 without force bias, thereby improving the force transmission efficiency, reducing damage, and avoiding the deflection of the spring seat 223.
[0039] Furthermore, the rolling element 24 abuts against the outer peripheral edge of the conical section 2231 close to the end of the spring 222, thereby minimizing the contact area between the rolling element 24 and the spring seat 223, thereby reducing wear.
[0040] The spring seat 223 further includes a connecting section 2232, which is connected to the tapered section 2231. A step 2233 is provided on the outer peripheral side of the connecting section 2232, and at least part of the spring 222 abuts against the step 2233. In this way, the connection between the spring 222 and the connecting section 2232 is more tightly connected, and the position of the spring 222 is also more stable.
[0041] The valve body 11 further includes a guide column 112, which is constructed in the first cavity 111 and extends toward the transmission part 21. A guide hole 113 is axially opened in the guide column 112, and the valve stem 221 is inserted into the guide hole 113. The spring seat 223 is movably connected to the outer peripheral side of the guide column 112. The guide column 112 makes the relative positions of the spring 222, the spring seat 223 and the valve stem 221 more fixed.
[0042] The guide post 112 is integrally formed with the valve body 11 , which is easy to process and has a more stable structure.
[0043] In this embodiment, the transmission part 21, the valve stem 221, the guide column 112 and the spring seat 223 are all coaxially arranged. In this way, the consistency of the four is better, and the movement of the four is more stable during the adjustment process.
[0044] Compared with the prior art, the utility model sets a rolling member 24 between the second adjusting unit 23 and the first adjusting unit 22, and the rolling member 24 greatly reduces the contact area between the second adjusting unit 23 and the first adjusting unit 22, thereby reducing the wear between the two, avoiding structural damage, and extending the service life of the second adjusting unit 23 and the first adjusting unit 22 and even the thermal expansion valve 100.
[0045] 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.
[0046] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.
Claims
1. A thermal expansion valve, characterized in that: include: A valve body assembly (10) comprises a valve body (11) and an adjusting seat (12), wherein the valve body (11) and the adjusting seat (12) are connected, the valve body (11) has a first cavity (111), the adjusting seat (12) has a second cavity (121), and the first cavity (111) and the second cavity (121) are arranged in communication; The regulating assembly (20) comprises a transmission part (21), a first regulating unit (22) and a second regulating unit (23); one side of the transmission part (21) is in contact with the diaphragm (30) of the thermal expansion valve, and the other side is in contact with the first regulating unit (22); an end of the second regulating unit (23) close to the first regulating unit (22) is provided with a rolling element (24); the rolling element (24) is in contact with the first regulating unit (22); when the second regulating unit (23) is displaced along the axial direction of the second chamber (121), the second regulating unit (23) drives the first regulating unit (22) to be displaced in the axial direction of the first chamber (111), so as to push the transmission part (21) and change the position of the diaphragm.
2. The thermal expansion valve according to claim 1, characterized in that: The second adjustment unit (23) is configured as an adjustment bolt, which is disposed in the second cavity (121) and is threadably engaged with a cavity wall of the second cavity (121) so as to move along the second cavity (121).
3. The thermal expansion valve according to claim 1, characterized in that: The rolling element (24) is configured as a spherical structure or a cylindrical structure.
4. The thermal expansion valve according to claim 1, characterized in that: An installation groove (231) is provided at one end of the second adjustment unit (23) close to the first adjustment unit (22), and the rolling element (24) is arranged in the installation groove (231).
5. The thermal expansion valve according to claim 4, characterized in that: The depth of the installation groove (231) is H, and the radius of the rolling element (24) is R, satisfying: H≥R.
6. The thermal expansion valve according to claim 1, characterized in that: The first regulating unit (22) comprises a valve stem (221), a spring (222) and a spring seat (223); the valve stem (221) is connected to the transmission part (21); the spring (222) is sleeved on the outer peripheral side of the valve stem (221); one end of the spring (222) abuts against the transmission part (21); the other end abuts against the spring seat (223); and the side of the spring seat (223 facing away from the spring (222) abuts against the rolling element (24).
7. The thermal expansion valve according to claim 6, characterized in that: The portion where the spring seat (223) abuts against the second adjustment unit (23) is a conical section (2231). Along the direction approaching the transmission part (21), the outer diameter of the conical section (2231) gradually increases, and the axis of the second adjustment unit (23) is perpendicular to the outer peripheral wall of the conical section (2231). The rolling element (24) abuts against the outer peripheral edge of the conical section (2231) close to one end of the spring (222).
8. The thermal expansion valve according to claim 7, characterized in that: The spring seat (223) also includes a connecting section (2232), the connecting section (2232) is connected to the conical section (2231), a step (2233) is provided on the outer peripheral side of the connecting section (2232), and at least a portion of the spring (222) abuts against the step (2233).
9. The thermal expansion valve according to claim 6, characterized in that: A guide column (112) is constructed in the first cavity (111), a guide hole (113) is axially opened in the guide column (112), the valve stem (221) is inserted into the guide hole (113), and the spring seat (223) is movably connected to the outer peripheral side of the guide column (112).
10. The thermal expansion valve according to claim 9, characterized in that: The transmission part (21), the valve stem (221), the guide column (112) and the spring seat (223) are all coaxially arranged.