A small check valve for an air conditioner

Abstract

The utility model discloses a small check valve for air conditioner, include: pipeline, and the integrated limit structure is formed with recessed processing to pipeline export end, valve seat, valve seat and pipeline's inlet end pressure joint fixed connection, valve core, and the cavity between valve core is arranged in valve seat and limit structure and is slid with pipeline inner chamber cooperation, limit structure is used for blocking the position of valve core close to pipeline export end, avoids the valve core and separates from the pipeline, when the refrigerant positive flow, and valve core is pressed and is abutted on limit structure and has the flow gap between valve seat and limit structure, thereby allowing the refrigerant to flow through the pipeline, when the refrigerant reverse flow, valve core is pressed and seals and is pasted on valve seat, thereby preventing the refrigerant backflow in the pipeline, through above -mentioned mode, the utility model can no longer need separate valve limiter parts, avoid the valve core and fall off the risk, reduce the number of parts, reduce the cost.

Description

Technical Field

[0001] This utility model relates to the field of valve technology for refrigeration systems, and in particular to a small check valve for air conditioning. Background Technology

[0002] In air conditioning systems, check valves, as crucial functional components immediately following the compressor, play a vital role in preventing high-pressure refrigerant gas from flowing back to the compressor side, thus avoiding equipment damage. Traditional check valves typically consist of pipes, a valve body, a valve core, and a valve limiter. Specifically, during forward flow, the refrigerant passes through the side of the valve core, pushing it towards the limiter under refrigerant pressure; during reverse flow, the refrigerant pressure presses the valve core against the conical surface of the valve body, achieving a seal through compression. However, existing technology has significant drawbacks: the valve limiter and valve body are separate components, secured by riveting, posing a risk of detachment. If the limiter or valve core detaches and enters the refrigeration circuit, it may block the pipes or be drawn into the compressor, causing equipment failure. Furthermore, the reliance on independent parts for the limiter structure limits product miniaturization and process simplification. Utility Model Content

[0003] The main technical problem solved by this utility model is to provide a small check valve for air conditioners that eliminates the need for a separate valve limiter part, avoids the risk of valve core falling off, reduces the number of parts, and lowers costs.

[0004] To solve the above-mentioned technical problems, the present invention provides a small check valve for air conditioning, comprising: The pipe has an integrally formed limiting structure at its outlet end through an inward process. Valve seat, which is crimped and fixedly connected to the inlet end of the pipeline; The valve core is located in the cavity between the valve seat and the limiting structure and slides in cooperation with the inner cavity of the pipeline; The limiting structure is used to prevent the valve core from approaching the outlet end of the pipeline, thus preventing the valve core from detaching from the pipeline; When the refrigerant flows in the forward direction, the valve core is pressed against the limiting structure, and a flow gap is left between the valve seat and the limiting structure, thereby allowing the refrigerant to flow through the pipeline; When the refrigerant flows in the reverse direction, the valve core is pressurized and seals against the valve seat, thus preventing the refrigerant from flowing back into the pipeline.

[0005] Preferably, the valve seat has a tapered hole that allows refrigerant to pass through. The tapered hole includes a first tapered hole and a second tapered hole arranged symmetrically. The first tapered hole is located on the side of the valve seat near the inlet end, and the second tapered hole is located on the side of the valve seat near the outlet end. The diameter of the first tapered hole on the side near the inlet end is larger than the diameter of the first tapered hole on the side away from the inlet end, and the diameter of the second tapered hole on the side near the outlet end is larger than the diameter of the second tapered hole on the side away from the outlet end.

[0006] Preferably, the valve core includes an integrally formed sealing block and multiple guide plates. The multiple guide plates are evenly distributed on the sealing block. When the sealing block extends into the second conical hole, the sealing block seals the second conical hole. The end of the guide plate near the second conical hole is a conical surface, and the end of the guide plate away from the second conical hole is a flat surface. A flow gap is formed between the multiple guide plates to allow the refrigerant to flow.

[0007] Preferably, the valve core is made of PTFE or PFA resin.

[0008] Preferably, a limiting groove is formed on the circumference of the valve seat, and the valve seat is crimped to the pipeline through the limiting groove.

[0009] Preferably, the diameter of the sealing block near the second conical hole is greater than the minimum diameter of the second conical hole and less than the maximum diameter of the second conical hole.

[0010] The beneficial effects of this utility model are as follows: By replacing the traditional split valve limiter with an integrated limiting structure at the pipe outlet, the risk of parts falling off is completely eliminated, preventing the limiter or valve core from clogging the refrigeration circuit or damaging the compressor. At the same time, the valve seat and the pipe adopt a press-fit fixation and double conical hole design. Combined with the integrated structure of the valve core's guide plate and sealing block, when the refrigerant flows in the forward direction, the flow velocity loss is reduced by the conical surface of the guide plate and a stable valve opening state is maintained. When the refrigerant flows in the reverse direction, the valve core moves quickly towards the valve seat through the plane of the guide plate, and the right-angle sealing surface of the sealing block and the second conical hole achieves rapid valve closing, significantly improving sealing reliability and response speed. In addition, the elimination of independent limiter parts and simplification of valve body functions reduce assembly processes, reduce material loss and production costs, and the double conical hole drainage structure of the valve seat effectively reduces fluid impact wear and extends product service life. Attached Figure Description

[0011] Figure 1 This is a perspective view of the overall structure of this utility model when the refrigerant is flowing in the forward direction; Figure 2 This is a perspective view of the overall structure of this utility model when the refrigerant is flowing in reverse. Figure 3 This is an exploded view of the valve core and valve seat of this utility model; Figure 4 This is an exploded view of the valve core and valve seat of this utility model from another perspective.

[0012] The components in the attached diagram are labeled as follows: 1. Pipeline; 11. Limiting structure; 2. Valve seat; 21. First conical hole; 22. Second conical hole; 23. Limiting groove; 3. Valve core; 31. Blocking block; 32. Guide plate; 321. Flow gap. Detailed Implementation

[0013] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0014] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0015] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0016] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0017] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0018] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0019] Unless otherwise specified, physical quantities in formulas should be understood as basic quantities of SI base units, or derived quantities derived from basic quantities through mathematical operations such as multiplication, division, differentiation, or integration.

[0020] Example: refer to Figures 1-4 A small check valve for use in air conditioning, comprising: Pipeline 1, the outlet end of pipeline 1 is formed with an integrally molded limiting structure 11 through concave processing; Valve seat 2 is crimped and fixedly connected to the inlet end of pipe 1; The valve core 3 is disposed within the cavity between the valve seat 2 and the limiting structure 11 and slides within the inner cavity of the pipe 1. A limiting groove 23 is formed on the circumference of the valve seat 2. The valve seat 2 is press-fitted to the pipe 1 through the limiting groove 23, meaning that during press-fitting, a portion of the pipe 1 is forced to recess, and this recessed portion is located within the limiting groove 23, thereby fixing the valve seat 2 in the designated position on the pipe 1. The limiting structure 11 is used to prevent the valve core 3 from approaching the outlet end of the pipe 1, preventing the valve core 3 from detaching from the pipe 1. The integrated limiting structure 11 eliminates the need for traditional independent limiting components, directly preventing the valve core 3 from detaching through the recessed forming of the pipe 1. When the refrigerant flows in the forward direction, the valve core 3 is pressurized against the limiting structure 11, leaving a flow gap 321 between the valve seat 2 and the limiting structure 11, thus allowing the refrigerant to flow through the pipe 1. When the refrigerant flows in the reverse direction, the valve core 3 is pressurized and seals against the valve seat 2, thus preventing the refrigerant from flowing back into the pipe 1.

[0021] refer to Figures 1-4The valve seat 2 has a tapered hole that allows refrigerant to pass through. The tapered hole includes a first tapered hole 21 and a second tapered hole 22 symmetrically opened at both ends of the valve seat 2. The first tapered hole 21 is opened on the side of the valve seat 2 near the inlet end, and the second tapered hole 22 is opened on the side of the valve seat 2 near the outlet end. The diameter of the first tapered hole 21 near the inlet end is larger than the diameter of the side of the first tapered hole 21 away from the inlet end, and the diameter of the second tapered hole 22 near the outlet end is larger than the diameter of the side of the second tapered hole 22 away from the outlet end. The valve core 3 includes an integrally formed sealing block 31 and multiple guide plates 32. The multiple guide plates 32 are evenly distributed on the sealing block 31. Under the action of refrigerant backflow, when the sealing block 31 extends into the second tapered hole 22, the sealing block 31 seals the second tapered hole 22, thereby preventing refrigerant backflow. The end of the guide plate 32 near the second conical hole 22 is a conical surface, and the end of the guide plate 32 away from the second conical hole 22 is a flat surface. Multiple guide plates 32 form flow gaps 321 that allow refrigerant flow. When the refrigerant flows in the forward direction, it contacts the conical surface of the guide plate 32. The conical surface reduces the impact cross-sectional area, thus lowering the refrigerant velocity. Simultaneously, it ensures sufficient force to slowly press the valve body against the limiting structure 11, ensuring the check valve is open. Conversely, when the refrigerant flows back in the reverse direction, the returning refrigerant directly impacts the flat surface of the guide plate 32, significantly reducing the refrigerant velocity and exerting a large impact force on the valve core 3. This forces the valve core 3 to move rapidly towards the valve seat 2 until the sealing block 31 seals with the conical sealing surface of the second conical hole 22, allowing the check valve to quickly close.

[0022] refer to Figures 1-4 The conical surface of the second conical hole 22, when it meets the right angle at the contact point between the sealing block 31 and the second conical hole 22, serves a sealing function. The diameter of the sealing block 31 near the second conical hole 22 is larger than the minimum diameter of the second conical hole 22 but smaller than its maximum diameter, thus ensuring that the sealing block 31 can extend into the second conical hole 22, thereby guaranteeing the sealing performance when the sealing block 31 and the second conical hole 22 are fitted together. The valve core 3 is made of PTFE or PFA resin, and the pressing of the valve core 3 against the conical surface of the second conical hole 22 further ensures the sealing effect and prevents refrigerant backflow.

[0023] refer to Figures 1-4 When the refrigerant flows into the first conical hole 21 in the forward direction, it flows from the larger pipe diameter into the smaller pipe diameter. If the conical surface of the first conical hole 21 is not treated, a flat section will be left that will be continuously affected by the impact force of the refrigerant fluid, resulting in wear. In addition, the valve seat 2, which was originally fixed in position by the indentation generated by the internal crimping of the copper pipe 1, is difficult to guarantee that it will not be pushed out after long-term continuous operation. Furthermore, the conical surface has a flow-guiding effect, which can reduce the flow rate loss of the fluid itself.

[0024] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A small check valve for air conditioning, characterized in that, include: Pipe (1), the outlet end of the pipe (1) is formed with an integrally molded limiting structure (11) by the concave processing; A valve seat (2) is crimped and fixedly connected to the inlet end of the pipe (1); the valve seat (2) is provided with a conical hole that allows refrigerant to pass through, the conical hole including a first conical hole (21) and a second conical hole (22) symmetrically arranged, the first conical hole (21) is located on the side of the valve seat (2) near the inlet end, the second conical hole (22) is located on the side of the valve seat (2) near the outlet end, the diameter of the first conical hole (21) near the inlet end is larger than the diameter of the first conical hole (21) away from the inlet end, and the diameter of the second conical hole (22) near the outlet end is larger than the diameter of the second conical hole (22) away from the outlet end; The valve core (3) is disposed in the cavity between the valve seat (2) and the limiting structure (11) and slides in cooperation with the inner cavity of the pipe (1); the valve core (3) includes an integrally formed sealing block (31) and multiple guide plates (32), the multiple guide plates (32) are evenly distributed on the sealing block (31), when the sealing block (31) extends into the second conical hole (22), the sealing block (31) seals the second conical hole (22), the end of the guide plate (32) near the second conical hole (22) is a conical surface, the end of the guide plate (32) away from the second conical hole (22) is a flat surface, and a flow gap (321) is formed between the multiple guide plates (32) to allow the refrigerant to flow; the diameter of the sealing block (31) near the second conical hole (22) is greater than the minimum diameter of the second conical hole (22) and less than the maximum diameter of the second conical hole (22); The limiting structure (11) is used to block the valve core (3) from approaching the outlet end of the pipe (1) to prevent the valve core (3) from detaching from the pipe (1); When the refrigerant flows in the forward direction, the valve core (3) is pressed against the limiting structure (11) and a flow gap (321) is left between the valve seat (2) and the limiting structure (11), thereby allowing the refrigerant to flow through the pipe (1); When the refrigerant flows in the reverse direction, the valve core (3) is pressurized and sealed against the valve seat (2), thereby preventing the refrigerant from flowing back in the pipeline (1).

2. A miniature check valve for air conditioning according to claim 1, characterized in that: The valve core (3) is made of PTFE or PFA resin.

3. A miniature check valve for air conditioning according to claim 1, characterized in that: The valve seat (2) has a limiting groove (23) on its circumference, and the valve seat (2) is press-fitted to the pipe (1) through the limiting groove (23).

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