CN210949890U

CN210949890U - Thermal expansion valve

Info

Publication number: CN210949890U
Application number: CN201921904799.1U
Authority: CN
Inventors: 不公告发明人
Original assignee: Zhejiang Sanhua Climate and Appliance Controls Group Co Ltd
Current assignee: Zhejiang Sanhua Commercial Refrigeration Co ltd
Priority date: 2019-11-07
Filing date: 2019-11-07
Publication date: 2020-07-07
Anticipated expiration: 2029-11-07

Abstract

The utility model discloses a thermal expansion valve, including air tank head subassembly, transfer line, valve body subassembly, case subassembly, air tank head subassembly includes the diaphragm, air tank head subassembly and valve body subassembly fixed connection, and the valve body subassembly includes case subassembly mounting hole, and the case subassembly is at least partly located case subassembly mounting hole, and the case subassembly includes case, case seat, elastic component and supporting seat, and the case seat includes the valve port portion, and valve port portion includes the valve port, and the case directly supports or indirectly supports with the transfer lineThe valve core can adjust the opening of the valve port, the upper end of the elastic part is directly or indirectly abutted against the valve core, the lower end of the elastic part is directly or indirectly abutted against the supporting seat, the supporting seat comprises a throttling channel, and the flow area of the throttling channel is defined as S₁The flow area of the valve port at the maximum opening is S₂Then S is₁Less than S₂The utility model discloses a thermostatic expansion valve can reduce the part number of case subassembly, simplifies the assembly process.

Description

Thermal expansion valve

Technical Field

The utility model relates to a fluid control technical field especially relates to a thermal expansion valve.

Background

Fig. 1 is a schematic diagram of a partial structure of a thermostatic expansion valve of the background art. Fig. 2 is a bottom view of the spring seat of fig. 1. As shown in the figure, the thermostatic expansion valve includes a valve core member 100, the valve core member 100 includes a spring 101, a spring seat 102, and a throttle seat 103 disposed below the spring seat 102, a throttle hole 104 is disposed in the center of the throttle seat 103, the spring seat 102 includes a central through hole 106, 3 recesses 105 are disposed at intervals on the outer peripheral portion of the spring seat 102 as flow passages, the flow areas of the central hole 106 and the recesses 105 are both larger than the flow area of the throttle hole 104, and the 3 flow passages 105 do not have a throttling function.

SUMMERY OF THE UTILITY MODEL

The application provides a thermal expansion valve, including air tank head subassembly, transfer line, valve body subassembly, case subassembly, air tank head subassembly includes the diaphragm, air tank head subassembly with valve body subassembly fixed connection, valve body subassembly includes case subassembly mounting hole, the case subassembly is located at least partially the case subassembly mounting hole, the case subassembly includes case, case seat, elastic component and supporting seat, the case seat includes the valve port portion, the valve port portion includes the valve port, the case with the transfer line is direct or indirect butt, the case can adjust the aperture of valve port, the upper end of elastic component with the case is direct or indirect butt, the lower extreme of elastic component with the supporting seat is direct or indirect butt, the supporting seat includes the throttle passageway, and the definition throttle passageway' S flow area is S₁The flow area of the valve port when the opening degree is maximum is S₂Then, S₁Less than S₂。

Compared with the thermostatic expansion valve in the background art, the thermostatic expansion valve reduces the number of parts of the valve core assembly and simplifies the assembly process.

Drawings

Fig. 1 is a partial schematic structural view of a thermostatic expansion valve of the background art;

FIG. 2 is a bottom view of the spring seat of FIG. 1;

FIG. 3 is a schematic structural diagram according to a first embodiment of the present application;

FIG. 4 is a schematic structural view of the valve spool assembly of FIG. 3;

FIG. 5 is a cross-sectional view of the support base of FIG. 4;

FIG. 6 is a bottom view of the support base of FIG. 5;

FIG. 7 is a schematic structural view of a second embodiment of the valve core assembly;

FIG. 8 is a cross-sectional view of the support base of FIG. 7;

FIG. 9 is a bottom view of the support base of FIG. 8;

FIG. 10 is a schematic structural view of a third embodiment of the valve core assembly;

fig. 11 is a schematic structural view of a fourth embodiment of the valve core assembly.

Detailed Description

It should be noted that, if the directional terms such as "upper" and "lower" are used herein, they are defined with reference to the position shown in the drawings of the present specification, and it should be understood that the directional terms are used only for the clarity and convenience of describing the technical solutions and should not be construed as limiting the scope of protection.

In order to make the technical solutions of the present application better understood by those skilled in the art, the technical solutions of the present application are further described below with reference to the accompanying drawings and specific embodiments.

As shown in fig. 3, the thermal expansion valve includes a tank head assembly 10, a valve body assembly 20, a valve core assembly 30, and a transmission rod 40. The air box head assembly 10 includes an air cap 11, an air box base 12, and a diaphragm 13. The valve body assembly 20 comprises a valve body 21, and the gas tank seat 12 is welded and fixed with the valve body 21. The valve body 21 includes a spool assembly mounting bore 211, and the spool assembly 30 is partially located in the spool assembly mounting bore 211.

The valve core assembly 30 is specifically a replaceable valve core, that is, the valve core assembly 30 is detachably connected to the valve body assembly 20, so that the valve core assembly 30 can be conveniently replaced, and the valve port diameter of the valve core assembly 30 can be conveniently serialized under the condition that other parts such as the valve body assembly and the like are not changed. The valve core assembly 30 includes a valve core 31, a valve core seat 32, an elastic member 33, a support seat 34, a valve core sleeve 35, a filter member 36 and a limit head 37. After the valve core assembly 30 is installed in the valve core assembly installation hole 211, the head 371 of the limiting head 37 extends out of the valve body 21, and the nut 50 is in threaded connection with the valve body 21 to assemble the valve core assembly 30 with the valve body 21. When the valve core assembly 30 needs to be replaced, the nut 50 is only required to be unscrewed, and the valve core assembly 30 is taken out of the valve body 21 integrally, so that the replacement is very convenient.

The valve core sleeve 35 is substantially cylindrical, the valve core seat 32 is located in the valve core sleeve 35, the upper portion of the valve core seat 32 is fixedly connected with the valve core sleeve 35, the lower portion of the valve core sleeve 35 is fixedly connected with the limiting head 37, and the filter 36 is fixed on the limiting head 37. The cartridge seat 32 includes a valve port portion 321, and the valve port portion 321 includes a valve port 322.

The valve core seat 32 has a substantially cylindrical outer edge, includes a valve port 321, and further includes a cylindrical portion 323 located below the valve port 322, and the support seat 34 is welded to the cylindrical portion 323, which provides high fixing reliability. The support seat 34 and the valve seat 32 may also be connected by, for example, the inner wall of the cylindrical portion 323 includes a first stepped portion 3231 with a downward stepped surface, the lower end of the cylindrical portion 323 includes a riveting portion 3232, the outer edge of the support seat 34 is located between the stepped surface of the first stepped portion 3231 and the riveting portion 3232, and the support seat 34 and the valve seat 32 are fixed by the first stepped portion 3231 and the riveting portion 3232 through the matching riveting, which does not need welding. It will be appreciated that the seat 34 and the valve core seat 32 may also be fixedly connected by a combination of the aforementioned welding and riveting.

The valve core 31 is basically positioned in the valve core seat 32, the elastic piece 33 is positioned in the valve core seat 32, the upper end of the valve core 31 extends out of the valve port 322 and then is directly abutted against the transmission rod 40, and the valve core 31 can adjust the opening degree of the valve port 322. Of course, it is understood here that the upper end of the valve slide 31 can also indirectly abut against the transmission rod 40, i.e. that other parts can be provided between the upper end of the valve slide 31 and the transmission rod 40, which parts can achieve the abutment.

The lower portion of the valve body 31 is seated on the spring seat 38, and the lower end surface of the spring seat 38 abuts on the elastic member 33. That is, the valve body 31 indirectly abuts against the upper end of the elastic member 33 via the spring seat 30. The elastic member 33 is embodied as a compression spring. It is understood that the valve body 31 may directly abut against the elastic member 33 when the spring seat 30 is not provided. The lower end of the elastic element 33 directly abuts against the support seat 34, but it is understood that the lower end of the elastic element 33 may indirectly abut against the support seat 34, for example, a metal gasket is sleeved on the support seat 34, so that the metal gasket directly abuts against the elastic element 33.

The actuator rod 40 is capable of acting on the valve spool 31 under the pressure of the fluid in the tank head 10, causing the valve spool 31 to adjust the opening of the valve port 322 to adjust the flow rate of the fluid between the first fluid port a and the second fluid port B of the thermostatic expansion valve. Generally, it is only necessary to adjust the opening degree of the valve port 322 to control the flow rate between the first fluid port a and the second fluid port B of the thermostatic expansion valve. However, the thermal expansion valve has a problem that the opening degree of the valve port is too large, which results in too large maximum flow, especially in some thermal expansion valves with small valve port diameters, the diameter of the valve port 322 cannot be processed small enough to meet the use requirement due to the limitation of processing technology, and so on, therefore, as shown in fig. 1 of the background art, the throttle seat 103 is arranged below the spring seat 102, and the throttle seat 103 is provided with one throttle hole 104. However, in this case, the spring seat 102 and the throttle seat 103 are two separate parts, and need to be separately machined and fixed. A throttle passage is arranged on the support seat 34, and the flow area of the throttle passage is defined as S₁The flow area of the valve port at the maximum opening is S₂Then, S₁Less than S₂. (the maximum opening here means the opening of the valve port when the valve element 31 moves to the limit position by the diaphragm 13), the flow area of the valve port 322, i.e. the maximum flow between the first fluid port a and the second fluid port B of the thermal expansion valve, is determined by the flow area S of the throttle passage₁That is, after the valve body 31 moves downward by the driving force of the driving lever 40 to make the valve port 322 reach a certain opening degree, the flow rate between the first fluid port a and the second fluid port B is not increased even if the valve body 31 continues to move downward to make the opening degree of the valve port 322 continue to increase.

So design, supporting seat 34 has the function of supporting elastic component 33 and providing the throttle passageway concurrently, compares in the background art, and spare part reduces, and corresponding assembly process has also reduced, still the cost is reduced.

As shown in fig. 3-6, the supporting seat 34 is substantially in a shape of Chinese character 'tu', and includes an elastic member supporting portion 341 and an elastic member engaging portion 342 protruding upward from an upper end of the elastic member supporting portion 341, and an elastic memberThe member receiving portion 342 is located in the elastic member 33, the throttling passage is a first throttling passage 343 axially penetrating through the elastic member receiving portion 342, the first throttling passage 343 is specifically a circular hole, and a flow area of the first throttling passage 343 is the aforementioned flow area S₁. The lower end of the elastic member 33 abuts on the elastic member support portion 341. In this embodiment, the elastic member supporting portion 341 is not provided with other through holes, thereby simplifying the processing process. As shown in fig. 5 and 6, the outer edge of the support seat 34 is circular, and the upper surface and the lower surface of the shadow portion are not communicated, that is, only one throttling passage is provided in the support seat 34 of this structure, which is convenient for determining the flow area of the first throttling passage. Moreover, the processing difficulty of the supporting seat 34 is low. Further, the support seat 34 further includes a transition hole 344 at a lower side of the first throttling passage 343, and an inner diameter of the transition hole 344 is larger than that of the first throttling passage 343. The provision of the transition hole 344 facilitates the machining of the first throttling passage 343.

Based on the foregoing description, the valve core assembly in the thermostatic expansion valve shown in fig. 3 can be further designed as shown in fig. 7, fig. 7 is a schematic structural view of a second embodiment of the valve core assembly, fig. 8 is a sectional view of the support seat shown in fig. 7, and fig. 9 is a bottom view of the support seat shown in fig. 8. As shown, the support seat 34A of the valve core assembly 30A may further include a second throttling channel 345A on the elastic member support portion 341A in addition to the first throttling channel 342A, and in this embodiment, the first throttling channel 342A substantially penetrates through the elastic member support portion 341A and the elastic member sleeving portion 342A. In the radial direction of the support seat 34A, the second throttle passage 345A is spaced apart from the first throttle passage 342A, and the sum of the flow areas of the first throttle passage 342A and the second throttle passage 345A is the aforementioned flow area S₁. The advantages of the present invention can be understood by referring to the advantages of the supporting base of the embodiment, which will not be described repeatedly. It is understood that, in the present embodiment, the second throttling channel 345A may be an axially through notch located at the outer edge of the elastic member supporting portion 341A shown in fig. 9, or may be a through hole located at the elastic member supporting portion 341A.

Fig. 10 is a schematic structural view of a third embodiment of the valve core assembly. As shown, the valve core assembly 30B includesA support seat 34B, the support seat 34B includes an elastic member support portion 341B and an elastic member engaging portion 342B protruding upward from an upper end of the elastic member support portion 341B, the elastic member engaging portion 342B is located in the elastic member 33, a lower end of the elastic member 33 is abutted against the elastic member support portion 341B, the throttling channel is a third throttling channel 346B disposed on the elastic member support portion 341B, a flow area of the third throttling channel 346B is the flow area S₁. The advantages of the present invention can be understood by referring to the advantages of the supporting base of the embodiment, which will not be described repeatedly.

Fig. 11 is a schematic structural view of a fourth embodiment of the valve core assembly. As shown in the drawings, the valve core assembly 30C includes a support seat 34C, and the support seat 34C includes an elastic member support portion 341C, in this embodiment, the valve core seat 32C is different from the valve core seats in the previous embodiments, and thus, the fixing manner of the support seat 34C is also different from that in the previous embodiments. As shown in the figure, the valve core seat 32C is riveted and fixed with the valve core sleeve 35, and the support seat 34C is riveted and fixed with the valve core sleeve 35. Specifically, the wall portion of the spool case 35 includes a first annular groove portion 351 and a second annular groove portion 352 that are provided at intervals, and the support seat 34C is caulked between the first annular groove portion 351 and the second annular groove portion 352. The throttling channel of the support seat 34C can be arranged as described above with reference to the support seats of the embodiments. And will not be repeated here.

In one embodiment, the orifice diameter of the throttling channel is 0.5mm or 0.8mm, which allows machining error between (+0.05mm and-0.01 mm).

In this embodiment, provide the supporting seat not fixed with the case seat, and with the fixed new fixed mode of case cover, can realize the beneficial effect of this application equally. In addition, in the present embodiment, the length of the valve core seat 32C is greatly reduced, which saves material.

The present application is described above by way of example. The principles and embodiments of the present application are explained herein using specific examples, which are provided only to help understand the method and the core idea of the present application. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.

Claims

1. A thermostatic expansion valve comprises an air tank head component, a transmission rod, a valve body component and a valve core component, the air box head component comprises a diaphragm, the air box head component is fixedly connected with the valve body component, characterized in that the valve body assembly comprises a valve core assembly mounting hole, the valve core assembly is at least partially positioned in the valve core assembly mounting hole, the valve core assembly comprises a valve core, a valve core seat, an elastic piece and a supporting seat, the valve core seat comprises a valve port part, the valve port part comprises a valve port, the valve core is directly or indirectly abutted with the transmission rod, the valve core can adjust the opening degree of the valve port, the upper end of the elastic piece is directly or indirectly abutted with the valve core, the lower end of the elastic piece is directly or indirectly abutted with the supporting seat, the supporting seat comprises a throttling channel, and the flow area of the throttling channel is defined as S.₁The flow area of the valve port when the opening degree is maximum is S₂Then, S₁Less than S₂。

2. The thermostatic expansion valve of claim 1, wherein the support base is substantially "convex" and comprises a resilient member support portion and a resilient member engaging portion protruding upward from an upper end of the resilient member support portion, the resilient member engaging portion is disposed in the resilient member, a lower end of the resilient member is abutted against the resilient member support portion, the throttling passage comprises a first throttling passage axially passing through the resilient member engaging portion, and a flow area of the first throttling passage is S₁。

3. The thermal expansion valve of claim 2, wherein the elastic member support portion comprises a transition hole at a lower side of the first throttling passage, and an inner diameter of the transition hole is larger than an inner diameter of the first throttling passage.

4. A thermostatic expansion valve according to claim 3, which is a thermal expansion valveCharacterized in that the throttling channel also comprises a second throttling channel positioned on the supporting part of the elastic part, the second throttling channel and the first throttling channel are arranged at intervals in the radial direction of the supporting seat, and the sum of the flow area of the first throttling channel and the flow area of the second throttling channel is S₁。

5. The thermal expansion valve of claim 1, wherein the support base is substantially "convex" and comprises a resilient member support portion and a resilient member engaging portion protruding upward from an upper end of the resilient member support portion, the resilient member engaging portion is located in the resilient member, a lower end of the resilient member is abutted against the resilient member support portion, the throttling passage comprises a third throttling passage disposed on the resilient member support portion, and a flow area of the third throttling passage is S₁。

6. The thermostatic expansion valve of any of claims 1-5, wherein the valve core seat further comprises a cylindrical portion located on the underside of the valve port portion, and the support seat is welded to the cylindrical portion.

7. The thermal expansion valve according to any one of claims 1-5, wherein the valve core seat further comprises a cylindrical portion located on a lower side of the valve port portion, an inner wall of the cylindrical portion comprising a first step portion with a downward facing step; the lower end of the cylindrical part comprises a riveting part, and the supporting seat and the valve core seat are riveted and fixed through the first step part and the riveting part.

8. The thermostatic expansion valve of any of claims 1-5, wherein the valve core assembly further comprises a valve core sleeve, the valve core seat is riveted to the valve core sleeve, and the support seat is riveted to the valve core sleeve.

9. The thermostatic expansion valve of claim 8, wherein the wall of the valve core sleeve includes a first annular groove portion and a second annular groove portion spaced apart from each other, and the support seat is riveted between the first annular groove portion and the second annular groove portion.

10. The thermostatic expansion valve of claim 1, wherein the valve body assembly comprises a valve body, the valve body comprises the valve core assembly mounting hole, the valve core assembly further comprises a valve core sleeve and a limiting head, the valve core sleeve is fixedly connected with the limiting head, the head of the limiting head extends out of the valve body, the valve core assembly is connected with the valve body through a nut, the valve core assembly is partially positioned in the valve core sleeve, the valve core seat is fixedly connected with the valve core sleeve, the valve core sleeve is detachably connected with the valve body, the supporting seat is approximately in a shape of Chinese character 'tu', the supporting seat comprises an elastic piece supporting part and an elastic piece sleeving part protruding upwards from the upper end surface of the elastic piece supporting part, the elastic piece sleeving part is positioned in the elastic piece, and the lower end of the elastic piece is abutted against the elastic piece supporting part, the throttling channel comprises a first throttling channel arranged on the elastic piece sleeving part, the elastic piece supporting part comprises a transition hole positioned on the lower side of the first throttling channel, and the inner diameter of the transition hole is larger than that of the first throttling channel.

11. A thermal expansion valve according to any of claims 1-3, wherein the throttling passage is one, and the aperture of the throttling passage is 0.5mm or 0.8 mm.