One-way valve

Abstract

The utility model relates to a one-way valve which comprises a valve body, a support, a valve element and a valve seat, the support, the valve element and the valve seat are arranged in the valve body, the valve seat is fixedly arranged on the valve body and provided with a fluid channel penetrating through the axial direction of the valve seat, and a valve port matched with the valve element is formed at the outlet end of the fluid channel. The support is fixedly arranged on the valve body and comprises a guide portion formed on a body of the support, the valve element comprises a main body portion and a matching portion, the main body portion is connected with the matching portion, the sectional area of the main body portion is larger than that of the matching portion, and the matching portion is slidably arranged in the guide portion. The valve seat is provided with a conical sealing face matched with the spherical sealing face, and the conical sealing face forms at least part of the valve port wall of the valve port. According to the one-way valve, the dependence on the assembly process precision is reduced, and the local leakage risk caused by installation deviation is effectively avoided.

Description

Technical Field

[0001] This application relates to the field of fluid control technology, specifically to a one-way valve applied to an air conditioning system. Background Technology

[0002] In air conditioning systems, the one-way valve is a key component for controlling the flow of refrigerant, and its performance directly affects the system's energy efficiency and reliability.

[0003] In related technologies, a conical sealing structure is often used, where the valve core end is conical, which mates with the conical sealing surface of the valve seat to achieve a seal. However, this structure requires high machining accuracy and assembly coaxiality. Misalignment or angular deviation between the valve core and the valve seat can lead to seal failure. In addition, after long-term use, the sealing conical surface is prone to seal failure due to mechanical wear, resulting in leakage and affecting system performance. Utility Model Content

[0004] This application provides a one-way valve that is easy to manufacture and has stable and reliable operation.

[0005] A one-way valve includes a valve body and a support, a valve core, and a valve seat disposed within the valve body. The valve seat is fixedly disposed within the valve body and has a fluid passage extending through its axial direction. The outlet end of the fluid passage forms a valve port that mates with the valve core. The support is fixedly disposed within the valve body and includes a guide portion formed therein. The valve core includes a main body portion and a mating portion. The main body portion is connected to the mating portion. The cross-sectional area of ​​the main body portion is larger than the cross-sectional area of ​​the mating portion. The mating portion is slidably disposed within the guide portion. The main body portion has a spherical sealing surface. The valve seat has a conical sealing surface that mates with the spherical sealing surface. The conical sealing surface constitutes at least a portion of the valve port wall.

[0006] The one-way valve of this application utilizes a line contact between the spherical sealing portion at the end of the valve core and the conical inclined surface inside the valve seat. The mating portion of the valve core is slidably disposed within a guide portion, and the guide portion of the bracket guides the movement of the valve core. When the valve core deviates angularly from the valve seat axis due to installation errors or vibration impacts, the spherical sealing structure can autonomously adjust the contact area. Even under conditions of tilted installation or slight displacement during long-term operation, a stable and reliable sealing effect can be achieved, and the product structure is simple. This application reduces the reliance on assembly process precision and effectively avoids the risk of local leakage caused by installation deviations. Attached Figure Description

[0007] Figure 1 This is a schematic diagram of a one-way valve structure;

[0008] Figure 2 for Figure 1 A schematic diagram of the one-way valve core in the open state;

[0009] Figure 3 This is a schematic diagram of the valve core structure of a one-way valve;

[0010] Figure 4 This is a top view when the support structure is a split structure;

[0011] Figure 5 Top view of the support structure as a single unit;

[0012] Figure 6 A schematic diagram of a one-way valve structure when the support is an integral structure;

[0013] Figure 7 A schematic diagram of the annular welding groove located in the main body of the valve seat;

[0014] Figure 8 A schematic diagram of the structure where the annular welding groove is located at the end of the valve seat;

[0015] Figure 9 This is a schematic diagram of the structure of the valve core when it is installed at an angle and its interaction with the valve assembly.

[0016] Figure 10 This is a schematic diagram of the one-way valve seat structure when the annular welding groove is located at the end of the valve seat.

[0017] 100. One-way valve; 1. Valve body; 11. Valve seat mounting cavity; 111. Valve seat positioning step; 2. Bracket; 21. Guide part; 22. Support part; 221. Through hole; 222. Center positioning hole; 3. Valve core; 31. Main body; 32. Mating part; 321. Cylindrical guide section; 33. Spherical sealing surface; 34. Annular sealing surface; 4. Valve seat; 41. Fluid passage; 42. Valve port; 43. Conical sealing surface; 44. Valve seat main body; 45. End; 46. Annular welding groove; 5. Valve core cavity; 6. Outlet cavity. Detailed Implementation

[0018] To make this application clearer, specific embodiments are described below with reference to the accompanying drawings.

[0019] like Figure 1As shown, this application provides a one-way valve, including a valve body 1 and a bracket 2, a valve core 3, and a valve seat 4 disposed within the valve body 1. The valve seat 4 is fixedly disposed within the valve body 1 and has a fluid passage 41 extending through its axial direction. The outlet end of the fluid passage 41 forms a valve port 42 that mates with the valve core. The bracket 2 is also fixedly disposed within the valve body 1 and includes a guide portion 21 formed within its body. The valve core 3 includes a main body portion 31 and a mating portion 32. The main body portion 31 connects to the mating portion 32. The cross-sectional area of ​​the main body portion 31 is larger than the cross-sectional area of ​​the mating portion 32. The mating portion 32 is slidably disposed within the guide portion 21. The main body portion 31 has a spherical sealing surface 33, and the valve seat 4 has a conical sealing surface 43 that mates with the spherical sealing surface 33. The conical sealing surface 43 forms at least a portion of the valve port wall of the valve port 42. When the one-way valve is in operation, the valve core 3 can slide along the guide portion 21 under the action of fluid pressure, thereby opening and closing the valve port 42. When the fluid flows in the forward direction, the valve core 3 is pushed against the valve seat 4, and the spherical sealing surface 33 and the conical sealing surface 43 are tightly fitted together to achieve a seal and prevent the fluid from flowing in the reverse direction. When the fluid flows in the reverse direction, the valve core 3 overcomes the fluid pressure and moves in the opposite direction, disengaging from the valve seat 4, allowing the fluid to flow through the valve port 42. Furthermore, the check valve of this application is designed with a spherical sealing surface on the valve core. This design differs from the planar or conical sealing structures commonly found in traditional check valves. The spherical sealing surface cooperates with the conical sealing surface on the valve seat. Even if the valve core and valve seat are not perfectly perpendicular due to installation errors or other reasons, the spherical sealing surface can automatically adapt to the conical sealing surface of the valve seat through its curved surface characteristics, thus ensuring a sealing effect. This structure gives the check valve a certain tolerance, improving its reliability and stability in practical applications. This check valve has advantages such as simple structure, good sealing performance, and fast response speed, and is suitable for various fluid control systems.

[0020] Further, please refer to Figure 2 In this application, the guide portion 21 is a cylindrical guide sleeve, fitted around the outer periphery of the mating portion 32. An axially extending mating section is formed between the inner peripheral wall of the guide sleeve and the outer peripheral wall of the mating portion 32, through which the mating portion 32 and the guide sleeve form a sliding fit. This cylindrical guide sleeve design provides stable guidance for the movement of the valve core 3, ensuring that the valve core 3 maintains linear movement during operation and avoiding poor sealing or jamming due to misalignment. The axial length of the mating section ensures that the two remain coaxial during the movement of the valve core 3, further improving the stability and accuracy of the valve core 3's movement. This guiding structure allows the valve core 3 to move quickly and accurately to the sealing position under fluid pressure, enhancing the sealing effect and operational reliability of the check valve, while also improving the working efficiency and response speed of the check valve.

[0021] Further, please refer to Figure 3The valve core 3's mating part 32 has a cylindrical guide section 321, and the mating clearance between the outer diameter of the cylindrical guide section 321 and the inner diameter of the guide part 21 is 0.05-0.15mm. The cylindrical guide section 321 provides the main support and guidance for the valve core 3. The small mating clearance between it and the guide part 21 effectively ensures the straightness and stability of the valve core 3's movement. Controlling the mating clearance within the range of 0.05-0.15mm ensures a good sliding fit between the valve core 3 and the guide part 21, while preventing assembly difficulties or jamming due to thermal expansion caused by excessively small clearance. This reduces the swaying and offset of the valve core 3 during movement, improves sealing performance, and enables stable operation under different working conditions, meeting the high-performance requirements of check valves in industrial production.

[0022] The bracket 2 includes a support portion 22, which has at least two through holes 221. The through holes 221 are evenly distributed circumferentially around the axis of the check valve. The through holes 221 penetrate the axial end faces of the support portion 22 to connect the valve core cavity 5 and the outlet cavity 6. When fluid flows inside the check valve, it can pass through the through holes 221, reducing the interference of fluid on the movement of the valve core 3, while reducing the flow resistance of the fluid and improving the fluid throughput efficiency. The circumferentially evenly distributed through holes 221 ensure the uniformity and stability of fluid flow, avoiding lateral pressure on the valve core 3 caused by uneven fluid distribution, and further improving the smoothness of the valve core 3's movement. The arrangement of multiple through holes 221 also increases the structural strength of the bracket 2, making it less prone to deformation when subjected to fluid pressure and extending the service life of the bracket 2. The end of the main body 31 of the valve core 3 away from the spherical sealing surface 33 has an annular stepped surface 34. This annular stepped surface 34 can play a limiting and buffering role during the movement of the valve core 3, preventing damage caused by excessive movement of the valve core 3. The ratio of the maximum outer diameter D of the main body 31 to the outer diameter d of the mating part 32 is 2.0 < D / d ≤ 3.0. This ratio ensures that the valve core 3 has sufficient strength and stability without affecting fluid flow or causing assembly difficulties due to an excessively large main body 31. The ratio of the axial distance L from the lower end face of the guide part 21 to the valve port 42 to the thickness T of the main body 31 is 1.5 ≤ L / T ≤ 2.5. Controlling this ratio helps optimize the movement stroke and sealing performance of the valve core 3, ensuring that the valve core 3 can fit tightly against the valve seat 4 in the appropriate position to achieve a reliable sealing effect.

[0023] In one embodiment, please refer to Figure 4The guide part 21 and the support part 22 are separate structures. The support part 22 has a central positioning hole 222, and the guide part 21 is welded and fixed in the central positioning hole 222 of the bracket 2. The separate structure design allows the guide part 21 and the support part 22 to be manufactured separately according to different size requirements and performance indicators, and then assembled, which helps to improve the processing accuracy of each component and the overall assembly quality. The central positioning hole 222 provides positioning for the guide part 21, ensuring the installation accuracy and coaxiality of the guide part 21 in the bracket 2.

[0024] In another embodiment, please refer to Figure 5 and Figure 7 The guide section 21 and the support section 22 are integrally molded structures. This integral design eliminates potential problems such as loosening and leakage at the joints of separate structures, improving the structural strength and reliability of the entire support assembly. During manufacturing, integral molding reduces the number of parts and assembly steps, lowering production costs and assembly errors, and improving production efficiency and product consistency. Simultaneously, the integral structure ensures good coaxiality and fitting accuracy between the guide section 21 and the support section 22, which is beneficial for improving the movement accuracy and sealing performance of the valve core 3. In applications requiring high dimensional accuracy and structural strength, the integrally molded guide section 21 and support section 22 better meet the requirements, ensuring the check valve maintains stable performance and quality during long-term operation.

[0025] The cone angle of the conical sealing surface 43 is 60°-80°, while the surface roughness of the contact area between the spherical sealing surface 33 and the conical sealing surface 43 is controlled within the range of 0.4μm≤Ra≤0.8μm. The cone angle of the conical sealing surface 43 is selected between 60° and 80° to ensure the sealing performance between the valve core 3 and the valve seat 4 while also considering the flexibility of opening and closing. Within this cone angle range, the sealing surface can provide sufficient contact area and sealing specific pressure when the valve core 3 presses against the valve seat 4, effectively preventing fluid leakage. Simultaneously, under fluid pressure, the valve core 3 can relatively easily overcome the friction between the sealing surfaces, achieving rapid opening. Controlling the surface roughness of the contact area within 0.4μm≤Ra≤0.8μm ensures that the sealing surface has a certain micro-texture, storing lubricating oil, reducing friction and wear, and extending the service life of the sealing surface, without causing a decrease in sealing performance due to excessive surface roughness.

[0026] In the check valve of this application, the inner wall of the valve body 1 is provided with an axially extending valve seat mounting cavity 11, and the valve seat mounting cavity 11 is provided with a radially inwardly protruding valve seat positioning step 111. The left end face of the valve seat 4 forms an axial positioning fit with the valve seat positioning step 111, thereby stably installing the valve seat 4 in the valve body 1. This axial positioning method has a simple structure, is easy to install, and can quickly and accurately determine the axial position of the valve seat 4 in the valve body 1, ensuring the installation accuracy of the valve seat 4. The valve seat positioning step 111 provides effective support and limit for the valve seat 4, preventing the valve seat 4 from moving axially under fluid pressure, and ensuring the fitting accuracy and sealing performance between the valve seat 4 and the valve core 3. Through the design of the valve seat mounting cavity 11 and the valve seat positioning step 111 on the inner wall of the valve body 1, the installation structure of the valve seat 4 is optimized, improving the assembly efficiency and reliability of the check valve, and also facilitating the replacement and maintenance of the valve seat 4.

[0027] Please see Figure 7 The valve seat 4 includes a main body 44 and an end 45. The outer circumference of the main body 44 is provided with an annular welding groove 46, which extends continuously in the circumferential direction to form a closed-loop structure. The annular welding groove 46 provides good positioning and fixing for welding between the valve seat 4 and the valve body 1, firmly connecting the valve seat 4 to the valve body 1 through welding, enhancing the installation strength and sealing performance of the valve seat 4. The closed-loop structure of the annular welding groove 46 ensures the continuity and uniformity of the welding, making the welded valve seat 4 and valve body 1 form a whole, effectively preventing fluid leakage from the gap between the valve seat 4 and valve body 1, and improving the reliability of the check valve.

[0028] Please see Figure 8 In this embodiment, an annular welding groove 46 is provided on the outer circumference of the end 45 of the valve seat 4 away from the valve core 3, and the opening direction of the welding groove 46 faces the inner wall of the valve body 1. This design allows the welding ring to be directly assembled onto the valve seat, resulting in higher assembly efficiency. In addition, the welding ring can also be assembled at both ends of the valve seat 4.

[0029] The above examples illustrate the principles and implementation methods of this application. The descriptions of the embodiments are merely for the purpose of helping to understand the methods and core ideas of this application. It should be noted that those skilled in the art can make various improvements and modifications to this application without departing from its principles, and these improvements and modifications also fall within the protection scope of this application.

Claims

1. A one-way valve, characterized in that, The valve includes a valve body (1) and a bracket (2), a valve core (3), and a valve seat (4) disposed within the valve body (1). The valve seat (4) is fixedly disposed on the valve body (1) and has a fluid channel (41) extending through it along its axial direction. The outlet end of the fluid channel (41) forms a valve port (42) that mates with the valve core. The bracket (2) is fixedly disposed on the valve body (1) and includes a guide portion (21) formed in the body. The valve core (3) includes a main body portion (31) and a mating portion. Part (32), the main body part (31) is connected to the mating part (32), the cross-sectional area of ​​the main body part (31) is larger than the cross-sectional area of ​​the mating part (32), the mating part (32) is slidably disposed in the guide part (21), the main body part (31) has a spherical sealing surface (33), the valve seat (4) is provided with a conical sealing surface (43) that mates with the spherical sealing surface (33), the conical sealing surface (43) constitutes at least part of the valve port wall of the valve port (42).

2. The one-way valve according to claim 1, characterized in that, The guide part (21) is a cylindrical guide sleeve, which is sleeved on the outer periphery of the mating part (32). The mating part (32) and the guide part (21) are slidably fitted. An axially extending mating section is formed between the inner peripheral wall of the guide sleeve and the outer peripheral wall of the mating part (32). The mating part (32) and the guide sleeve are slidably fitted through the mating section.

3. The one-way valve according to claim 2, characterized in that, The mating part (32) has a cylindrical guide section (321), and the mating clearance between the outer diameter of the cylindrical guide section (321) and the inner diameter of the guide part (21) is 0.05-0.15mm.

4. The one-way valve according to claim 3, characterized in that, The bracket (2) includes a support part (22), which has at least two through holes (221). The through holes (221) are evenly distributed around the axis of the one-way valve. The through holes (221) pass through the two axial end faces of the support part (22) to connect the valve core cavity (5) and the outlet cavity (6). The end of the main body part (31) of the valve core away from the spherical sealing surface (33) has an annular stepped surface (34). The ratio of the maximum outer diameter D of the main body part (31) to the outer diameter d of the mating part (32) is 2.0 < D / d ≤ 3.

0. The ratio of the axial distance L from the lower end face of the guide part (21) to the valve port (42) to the thickness T of the main body part (31) is 1.5 ≤ L / T ≤ 2.

5.

5. The one-way valve according to claim 4, characterized in that, The guide part (21) and the support part (22) are separate structures. The support part (22) has a central positioning hole (222). The guide part (21) is welded and fixed in the central positioning hole (222) of the bracket (2).

6. The one-way valve according to claim 4, characterized in that, The guide part (21) and the support part (22) are integrally formed structures.

7. The one-way valve according to any one of claims 1-6, characterized in that, The cone angle of the conical sealing surface (43) is 60°~80°; the surface roughness of the contact area of ​​the spherical sealing surface (33) is 0.4μm≤Ra≤0.8μm.

8. The one-way valve according to claim 7, characterized in that, The valve body (1) has an axially extending valve seat mounting cavity (11) on its inner wall. The valve seat mounting cavity (11) has a radially inwardly protruding valve seat positioning step (111). The left end face of the valve seat (4) forms an axial positioning fit with the valve seat positioning step (111).

9. The one-way valve according to claim 8, characterized in that, The valve seat (4) includes a valve seat body (44) and an end (45). The outer circumference of the valve seat body (44) is provided with an annular welding groove (46), which extends continuously in the circumferential direction to form a closed loop structure.

10. The one-way valve according to claim 8, characterized in that, The valve seat (4) has an annular welding groove (46) on the outer circumference of the end (45) away from the valve core (3), and the opening direction of the welding groove (46) is towards the inner wall of the valve body (1).

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