Charging valve

Abstract

According to the filling valve, the peripheral wall part of a valve rod is in sliding contact with the inner wall of a valve cavity, so that the inner wall of the valve cavity can guide the axial reciprocating motion of the valve rod, and the problem that in the prior art, when an ejector pin is jacked in, a control component and a system connected to the filling valve cannot be conducted due to the fact that the ejector pin is prone to deviating and slipping is solved. And the circulation channel is arranged between the inner wall and the peripheral wall part of the valve cavity, and the cross section of the circulation channel can be relatively large, so that the flow is increased, the high-flow and high-pressure filling is met, and the filling efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigeration control, and in particular to a charging valve. Background Art

[0002] A typical charging valve structure, capable of opening and closing pipelines, is widely used in refrigeration systems and other piping systems. For example, during the manufacturing and maintenance of refrigeration systems, refrigerant charging and pipeline vacuuming are required. The charging valve, connected to a specific location in the refrigeration system pipeline, serves as the connection port for refrigerant charging and vacuuming operations, connecting and disconnecting these operating equipment and refrigeration system pipelines. Furthermore, some control components in the refrigeration system, such as pressure sensors and high and low pressure switches, are also connected to the system pipelines via the charging valve.

[0003] The opening stability and closing reliability of the filling valve directly affect the working performance of the system in which it is used. Therefore, the performance of the filling valve is one of the main issues that technicians in this field pay attention to when designing the filling valve. Summary of the Invention

[0004] The purpose of the present application is to provide a filling valve in which the ejector pin is not easily deflected when being inserted.

[0005] An embodiment of the present application provides a filling valve, including a valve body, a valve stem assembly and an elastic member, the valve body having a valve cavity, the valve stem assembly including a valve stem and a sealing body, the valve stem including a main body portion and a push rod portion connected to each other, the sealing body being arranged on a side of the main body portion close to the push rod portion, the valve cavity having a sealing surface portion that is sealed against the sealing body to cut off the valve cavity, one end of the elastic member directly or indirectly abuts against a side of the main body portion away from the push rod portion, and the other end directly or indirectly abuts against an inner wall of the valve cavity, the main body portion includes a circumferential wall portion, the circumferential wall portion is in axial sliding contact with the inner wall of the valve cavity, and a circulation channel is formed between the circumferential wall portion and the inner wall of the valve cavity, when the push rod portion is pushed open, the sealing body is disengaged from the sealing surface portion, and the valve cavity is connected through the circulation channel.

[0006] In the embodiment of the present application, the peripheral wall portion of the valve stem is in sliding contact with the inner wall of the valve cavity, so that the inner wall of the valve cavity can guide the axial reciprocating motion of the valve stem, overcoming the problem in the prior art that the ejector pin is easily deflected and slipped when inserted, resulting in the control components and systems connected to the filling valve being unable to conduct, and the flow channel is arranged between the inner wall of the valve cavity and the peripheral wall portion, and the cross-section of the flow channel can be relatively large, increasing the flow rate to meet large-flow and high-pressure filling, thereby improving the filling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1A schematic cross-sectional view of a filling valve according to an embodiment of the present invention;

[0008] Figure 2 for Figure 1 AA section view of the filling valve shown;

[0009] Figure 3 for Figure 1 3D schematic diagram of the valve stem in the charging valve shown.

[0010] in, Figures 1 to 3 middle:

[0011] 1. Valve body; 11. Valve cavity; 111. Matching shaft segment; 112. Valve cavity inner wall; 12. Valve port; 121. Sealing surface segment; 13. Connecting thread; 14. First end segment; 15. Second end segment; 2. Valve stem assembly; 21. Valve stem; 21. Main body; 21.1-1. Peripheral wall; 21.11. Sliding portion; 21.12. Concave portion; 21.13. Annular surface; 21.14. Notch; 21.15. End face; 21.16. Arc-shaped surface; 2.a. Flow channel; 21.2. Push rod; 21.21. First shaft segment; 21.21. Second shaft segment; 22. Sealing body; 3. Elastic member; 4. Retaining ring; 5. Connecting pipe. DETAILED DESCRIPTION

[0012] With regard to the filling valve mentioned in the background technology, the inventors of this application have conducted extensive research on the structure of the filling valve: Currently, the filling valve mainly includes a valve body and a valve core assembly installed inside the valve body, the valve core assembly includes a ejector pin, a spring and a hollow core body, and a sealing gasket is provided on the ejector pin to seal against one end of the hollow core body. When the ejector pin is pushed in, the ejector pin is separated from the hollow core body, and the filling valve is in a conducting state. When the external force is removed, under the action of the spring restoring force, the ejector pin is sealed against the hollow core body again, and the filling valve is in a cut-off state.

[0013] Currently, the ejector pin is prone to deflection and slippage during insertion, making the control components and systems connected to the filling valve unable to conduct.

[0014] Furthermore, the current charging valve's port is located within the hollow core of the valve core assembly, meaning the valve's opening and closing are controlled by the valve core assembly. This significantly limits the refrigerant charging speed due to the narrow flow path in the valve core, making it unsuitable for refrigerant charging in larger units. When the charging speed is too fast or the charging pressure is too high, the gasket can deform or fall off. Once the valve core ejector pin is reset, the gasket and core assembly lose their seal, leading to leakage.

[0015] Therefore, how to overcome at least one of the above-mentioned defects is a technical problem that needs to be solved urgently by those skilled in the art.

[0016] In order to enable those skilled in the art to better understand the technical solution of the present application, the present application is further described in detail below. The filling valve provided in the embodiments of the present invention can be applied to refrigeration and heating devices or equipment such as air conditioners, heat pump water heaters, chillers, vending machines, ice makers, supermarket freezers, refrigerators, etc. The present invention mainly introduces the technical solution and technical effects by mainly using the filling valve applied to the refrigeration system as an example. Of course, those skilled in the art should understand that the filling valve described herein can also be applied to other systems.

[0017] Please refer to Figures 1 to 3 , Figure 1 A schematic cross-sectional view of a filling valve according to an embodiment of the present invention; Figure 2 for Figure 1 AA section view of the filling valve shown; Figure 3 for Figure 1 3D schematic diagram of the valve stem in the charging valve shown.

[0018] An embodiment of the present invention provides a filling valve, comprising a valve body 1 , a valve stem assembly 2 and an elastic member 3 .

[0019] The valve body 1 has a valve cavity 11, which runs through the valve body 1 axially. Figure 1 The center direction S is the axial direction of the valve cavity 11. The valve body 1 has a first end 14 and a second end 15, which are arranged along the axial direction. The valve cavity 11 is provided with a valve port 12. The valve stem assembly 2 is used to open or close the valve port 12. When the valve port 12 is opened, the first end 14 and the second end 15 of the valve cavity 11 are connected, and the fluid medium can flow from the second end 15 of the valve cavity 11 to the first end 14. When the valve port 12 is closed, the valve cavity 11 is blocked.

[0020] In the embodiment of the present application, the valve stem assembly 2 includes a valve stem 21 and a sealing body 22, and the valve stem 21 includes a main body portion 211 and a push rod portion 212 connected to each other, wherein the main body portion 211 and the push rod portion 212 can be fixedly connected, for example, they are fixed by threaded connection or welding. Of course, the main body portion 211 and the push rod portion 212 can also be integrally formed, for example, the main body portion 211 and the push rod portion 212 can be integrally formed by machining, or they can be formed by casting or other methods. In the embodiment of the present application, the valve body 1 and the valve stem 21 can be made of stainless steel, of course, they can also be made of copper or copper alloy, such as brass or copper. Of course, the valve body 1 and the valve stem 21 can also be made of other alloy materials, such as titanium alloy. The sealing body 22 can be an elastomer that can be deformed by compression, so that the sealing body 22 can fit and seal with the sealing surface portion 121 when compressed by force.

[0021] In the embodiment of the present application, the valve body 1 includes a first end 14 and a second end 15. A connecting pipe is fixed to the first end 14. The outer peripheral wall of the second end 15 is provided with a connecting thread 13. The push rod portion 212 is located at the second end 15. The connecting pipe is connected to the refrigeration system pipeline, and the second end 15 is connected to the external charging equipment.

[0022] In the embodiment of the present application, the sealing body 22 can be provided on a side of the main body 211 close to the push rod 212. The push rod 212 extends through the valve port 12 toward the second end 15. The end of the push rod 212 away from the main body 211 may not be exposed outside the valve body 1. Of course, a partial axial section of the push rod 212 may also be located outside the valve body 1. The main body 211 may be completely located inside the valve cavity 11. The valve cavity 11 has a sealing surface portion 121 that seals against the sealing body 22 to cut off the valve cavity 11. When the sealing body 22 abuts against the sealing surface portion 121, the valve cavity 11 is cut off.

[0023] In the embodiment of the present application, one end of the elastic member 3 directly or indirectly abuts against the side of the main body 211 away from the top rod portion 212, that is, one end of the elastic member 3 can directly abut against the end face 2115 of the main body 211, and the elastic member 3 can also indirectly abut against the main body 211 through an intermediate component. Figure 1 As shown in the figure, a retaining ring 4 is installed inside the valve cavity 11, one end of the elastic member 3 directly abuts against the main body 211, and the other end of the elastic member 3 abuts against the retaining ring 4, that is, the elastic member 3 indirectly abuts against the inner wall 112 of the valve cavity through the retaining ring 4.

[0024] In the embodiment of the present application, the main body 211 includes a peripheral wall portion 211-1, and the peripheral wall portion 211-1 is in axial sliding contact with the valve cavity inner wall 112. In one embodiment, the peripheral wall portion 211-1 is in clearance fit with the valve cavity 11, and the valve cavity 11 has an axial movement guiding function for the peripheral wall portion 211-1. A circulation channel 2a is formed between the peripheral wall portion 211-1 and the valve cavity inner wall 112. The circulation channel 2a can be processed only on the peripheral wall portion 211-1, and the peripheral wall portion 211-1 can be provided with an axially extending recess 2112, and the recess 2112 forms the circulation channel 2a. This processing method is relatively simple. The circulation channel 2a can also be processed only on the valve cavity inner wall 112, and the valve cavity inner wall 112 has a recess 2112, and the recess 2112 forms the circulation channel 2a. Of course, the recess 2112 can also be processed on the peripheral wall portion 211-1 and the valve cavity inner wall 112 at the same time, and the flow channel 2a can be formed on the peripheral wall portion 211-1 and the valve cavity inner wall 112 at the same time, so as to meet the large flow demand.

[0025] Under normal conditions, under the action of the elastic member 3, the sealing body 22 and the sealing surface 121 seal against each other, blocking the valve cavity 11. The two ends of the valve cavity 11 are disconnected, and the filling valve is in a closed state. When an external force pushes the outer end of the push rod portion 212 toward the first end 14, the sealing body 22 also moves toward the first end 14 along with the valve stem 21, separating the sealing body 22 from the sealing surface 121. The valve cavity 11 is connected through the circulation channel 2a. In this way, the fluid medium flowing into the valve cavity 11 from the second end 15 can flow through the valve port 12 and the circulation channel 2a to the first end 14 of the valve cavity 11, thereby completing the filling of the fluid using the filling valve.

[0026] In the embodiment of the present application, the peripheral wall portion 211-1 of the valve stem 21 is in sliding contact with the inner wall 112 of the valve cavity, so that the inner wall 112 of the valve cavity can guide the axial reciprocating motion of the valve stem 21, overcoming the problem that the ejector pin of the prior art is easily deflected and slipped when it is inserted, resulting in the control components and systems connected to the filling valve being unable to conduct, and the circulation channel 2a is arranged between the inner wall 112 of the valve cavity and the peripheral wall portion 211-1. The cross-section of the circulation channel 2a can be relatively large, increasing the flow rate to meet the needs of large-flow and high-pressure filling, thereby improving the filling efficiency.

[0027] In the embodiment of the present application, the peripheral wall portion 211-1 is provided with at least one inner recess 2112, and the inner recess 2112 and the valve cavity inner wall 112 form a flow channel 2a, and the inner recess 2112 can be substantially a plane extending in the axial direction, such as Figure 3 As shown, a flat surface is easy to machine. Of course, the inner recess 2112 can also be a curved surface, such as an arcuate surface. Machining the inner recess 2112 on the peripheral wall portion 211-1 is relatively simple and easy to implement. The structure of each inner recess 2112 can be exactly the same, or the structure of each inner recess 2112 can be different. For example, all inner recesses 2112 can be partially flat and partially curved, as long as the flow channel 2a can be formed.

[0028] In one embodiment, there are at least two inner recesses 2112, and each inner recess 2112 is arranged along the circumferential direction. Figure 2 and Figure 3The figure shows that there are four inner recesses 2112, which are evenly arranged along the circumference and opposite each other. To clearly and concisely describe the technical solution, this application defines the two oppositely arranged inner recesses 2112 as a first inner recess 2112' and a second inner recess 2112'. The peripheral wall portion 211-1 includes a sliding portion 2111 formed between adjacent inner recesses 2112, and the sliding portion 2111 is in axial sliding contact with the valve cavity inner wall 112. As shown in the figure, in this embodiment of the present application, there are four sliding portions 2111, respectively formed between the two first inner recesses 2112', between the first inner recess 2112' and the second inner recess 2112', and between the two second inner recesses 2112'. The four sliding portions 2111 are of the same shape and evenly distributed along the circumference, which facilitates the stable reciprocating motion of the peripheral wall portion 211-1 and the valve cavity inner wall 112.

[0029] In the embodiment of the present application, the sliding portion 2111 is an arcuate surface, and the inner wall 112 of the valve cavity and the sliding portion 2111 cooperate with the arcuate surface of the shaft section 111, sliding smoothly, and the formed flow channel 2a has little resistance to the fluid, which is conducive to the smooth flow of the fluid medium.

[0030] In the embodiment of the present application, the section of the inner recess 2112 away from the sealing body 22 is further provided with a notch 2114. The notch 2114 extends radially and has a notch on the side facing the elastic member 3. Thus, after the fluid medium flows along the circulation channel 2a to the notch 2114, the fluid flows through the notch 2114 into the valve chamber 11 where the spring is located. This increases the cross-sectional area of ​​the circulating medium, further increasing the flow rate and the filling speed, making it suitable for high-flow units.

[0031] In the embodiment of the present application, the notch 2114 of the opposed first inner recess 2112 penetrates the second inner recess 2112 to form the notch 2114 of the second inner recess 2112. The opposed first inner recess 2114 and second inner recess 2114 have a symmetry plane, and the projections of the notch 2114 of the first inner recess 2112 and the notch 2114 of the second inner recess 2112 on the symmetry plane completely overlap.

[0032] In this embodiment, the processing technology of the notches 2114 of the two oppositely disposed inner recesses 2112 is relatively low.

[0033] Of course, the structures of the recess 2114 of the first inner recess 2112 and the recess 2114 of the second inner recess 2112 that are arranged opposite to each other may also be different, as long as they do not affect the flow of the fluid medium.

[0034] In the embodiment of the present application, the end surface of the main body 211 facing the top rod 212 has an annular surface 2113. The annular surface 2113 is located on the periphery of the top rod 212. The sealing body 22 is mounted on the annular surface 2113 and is sleeved over a portion of the shaft of the top rod 212. The sealing body 22 may be a rubber ring or a silicone ring. The sealing body 22 may be fixedly coupled to the valve stem 21 through a vulcanization process. Alternatively, the sealing body 22 may be mounted to the valve stem 21 through bonding or an interference fit.

[0035] When the valve chamber 11 is cut off, under the action of the elastic member 3, the sealing body 22 is compressed between the annular surface 2113 and the sealing surface portion 121. The annular surface 2113 has the function of limiting the end face of the sealing body 22 away from the top rod portion 212, which is beneficial to the installation of the sealing body 22 and improves the installation reliability of the sealing body 22 and the valve stem 21.

[0036] The annular surface 2113 may also be connected to the peripheral wall portion 211 - 1 via the arc surface 2116 to reduce resistance to the fluid.

[0037] In one embodiment, the top rod portion 212 includes a first shaft segment 2121 and a second shaft segment 2122 connected to each other, the diameter of the first shaft segment 2121 is larger than the diameter of the second shaft segment 2122, the first shaft segment 2121 is connected to the main body portion 211, and the sealing body 22 is sleeved on the outer periphery of the first shaft segment 2121.

[0038] In the embodiment of the present application, the sealing surface portion 121 is a tapered surface. The radial dimension of the tapered surface gradually increases along the direction from the push rod portion 212 to the arrangement of the elastic member 3. The sealing body 22 has a tapered sealing surface that cooperates with the tapered surface to form a seal. In this embodiment, the sealing body 22 has a compact tapered structure, which can reduce the space occupied by the valve cavity 11. The tapered surface also has a relatively high sealing effect.

[0039] Of course, the sealing surface 121 may also be of other structural forms. For example, the sealing surface 121 may be a plane perpendicular to the axial direction, and the sealing body 22 may be a columnar structure accordingly, and the two planes may abut against each other.

[0040] In the embodiment of the present application, the valve cavity 11 has a mating hole section that circumferentially slides with the elastic member 3. In other words, the inner wall of the mating hole section of the valve cavity 11 can guide the axial movement of the elastic member 3, preventing the elastic member 3 from being twisted by force during compression, and preventing the push rod portion 212 from deflecting and slipping when it is pushed in.

[0041] The elastic member 3 in the embodiment of the present application can be a spring, such as a cylindrical spring or a conical spring, as long as it can provide a restoring force to the valve stem 21 and achieve a reliable seal between the sealing body 22 and the sealing surface 121. The spring has a simple structure and occupies a small space, minimizing the space occupied by the internal space of the valve cavity 11, which is conducive to increasing the flow rate of the filling valve.

[0042] In the embodiment of the present application, the valve body 11 is further provided with a filling opening portion 12A and a valve mouth portion 12B provided with a valve port 12. The valve mouth portion 12B is located between the sealing surface portion 121 and the filling opening portion 12A, and part of the push rod portion 212 is located at the valve port 12 for easy filling.

[0043] For other structures of the filling valve, please refer to the prior art and will not be described in detail in this article.

[0044] The directional terms mentioned in the embodiments of the present application, such as "inside" and "outside", etc., are only references to the directions in the drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of the present invention, rather than indicating or implying that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present invention.

[0045] In the description of the embodiments of the present application, the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0046] In the embodiments of the present application, "or / and" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0047] The above is only a preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A filling valve, characterized in that:

14. The closure of the claimed invention comprises a valve body, a valve stem assembly and an elastic member, wherein the valve body has a valve cavity, the valve stem assembly comprises a valve stem and a sealing body, the valve stem comprises a main body portion and a push rod portion connected to each other, the sealing body is arranged on a side of the main body portion close to the push rod portion, the valve cavity has a sealing surface portion which is sealed against the sealing body to cut off the valve cavity, one end of the elastic member is directly or indirectly against a side of the main body portion away from the push rod portion, and the other end is directly or indirectly against an inner wall of the valve cavity, the main body portion comprises a circumferential wall portion, the circumferential wall portion is in axial sliding contact with the inner wall of the valve cavity, and a circulation channel is formed between the circumferential wall portion and the inner wall of the valve cavity, when the push rod portion is pushed open, the sealing body is disengaged from the sealing surface portion, and the valve cavity is connected through the circulation channel.

2. The filling valve according to claim 1, characterized in that The peripheral wall portion is provided with at least one inner recess, and the inner recess and the inner wall of the valve cavity form the flow channel.

3. The filling valve according to claim 2, characterized in that There are at least two inner recesses, each of which is arranged along the circumferential direction. The peripheral wall portion further includes a sliding portion located between adjacent inner recesses, and the sliding portion is in axial sliding contact with the inner wall of the valve cavity.

4. The filling valve according to claim 3, characterized in that The section of the inner concave portion away from the sealing body is further provided with a notch, which extends radially and has a gap toward the elastic member.

5. The filling valve according to claim 4, characterized in that The inner recesses are arranged in pairs radially opposite to each other, and the two oppositely arranged inner recesses are respectively defined as a first inner recess and a second inner recess. The notch of the first inner recess radially penetrates the second inner recess to form a notch of the second inner recess.

6. The filling valve according to any one of claims 1 to 5, characterized in that: The valve stem is an integrated structure; Alternatively / and, the end face of the main body facing the push rod has an annular surface, the annular surface is located at the periphery of the push rod, the sealing body is installed on the annular surface, and the sealing body is sleeved on a partial shaft section of the push rod.

7. The filling valve according to claim 6, characterized in that The push rod portion includes a first shaft segment and a second shaft segment connected to each other. The diameter of the first shaft segment is larger than the diameter of the second shaft segment. The first shaft segment is connected to the main body portion, and the sealing body is sleeved on the outer periphery of the first shaft segment.

8. The filling valve according to any one of claims 1 to 5, characterized in that: The sealing surface portion is a conical surface, and the radial dimension of the conical surface gradually increases along the arrangement direction from the push rod portion to the elastic member. The sealing body has a conical sealing surface that cooperates with the conical surface for sealing.

9. The filling valve according to any one of claims 1 to 5, characterized in that: The valve cavity is provided with a retaining ring, and one end of the elastic member away from the main body abuts against the retaining ring; Alternatively or alternatively, the valve cavity has a matching hole section that is circumferentially slidably matched with the elastic member.

10. The filling valve according to any one of claims 1 to 5, characterized in that: The valve body includes a first end and a second end. The first end is fixed with a connecting pipe. The outer peripheral wall of the second end is provided with a connecting thread. The push rod is located at the second end.

11. The filling valve according to any one of claims 1 to 5, characterized in that: The valve body is further provided with a filling opening and a valve mouth portion provided with a valve port, the valve mouth portion is located between the sealing surface portion and the filling opening, and a portion of the push rod portion is located at the valve port.

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