One-way valve

Abstract

A one-way valve (100) comprising a valve body (10) and a piston unit (20), the valve body (10) includes a valve chamber (11) and a valve port (12), the valve body (10) is provided with an inlet (13) and an outlet (14), the valve port (12) is located between the inlet (13) and the valve chamber (11), the outlet (14) is connected to the valve chamber (11), the piston unit (20) is movable in the axial direction of the valve body (10) within the valve chamber (11) to open and close the valve port (12), the valve chamber (11) includes an enlarged diameter portion (15), the flow area of ​​the enlarged diameter portion (15) is larger than the flow area of ​​the valve port (12). Such a one-way valve can avoid the risk of throttling and flow obstruction, and can further improve the flow capacity.

Description

[Technical field]

[0001] Related Applications This application claims priority to a Chinese patent application filed on May 26, 2021, bearing application number 202121151286.5 and titled "One-way Valve", the entire contents of which are incorporated herein by reference.

[0002] This application relates to the technical field of valves, and in particular to one-way valves. [Background technology]

[0003] A one-way valve is a valve that allows liquid to flow in only one direction and prevents flow in the reverse direction. Such one-way valves are installed in locations such as the piping of hydraulic circuits or cooling circulation systems to prevent the backflow of liquid.

[0004] A one-way valve in the related art includes a valve chamber and a piston within the valve chamber. When the piston moves toward / away from a valve orifice within the valve chamber, there is always a risk of throttling due to the expansion of the sealing member, which will impede the flow of refrigerant and affect the normal operation of the one-way valve. Summary of the Invention

[0005] According to each embodiment of the present application, there is provided a one-way valve including a valve body and a piston unit, the valve body including a valve chamber and a valve port, the valve body having an inlet and an outlet formed therein, the valve port being located between the inlet and the valve chamber, and the outlet being connected to the valve chamber, the piston unit being movable along the axial direction of the valve body within the valve chamber to open and close the valve port, the valve chamber including an enlarged portion, a flow area of ​​the enlarged portion being greater than a flow area of ​​the valve port.

[0006] In one embodiment, the one-way valve further includes a guide rod, the guide rod being fixed within the valve chamber, the piston unit including a piston rod and a seal member, one end of the piston rod being engaged with the guide rod and the other end being provided toward the valve orifice, the seal member being attached to the end of the piston rod toward the valve orifice, the piston rod being movable along the axis of the valve body by the guiding action of the guide rod, and linking the seal member to open and close the valve orifice.

[0007] In one embodiment, the flow area within the valve chamber at one end closer to the outlet of the valve orifice is greater than the flow area at the valve orifice.

[0008] In one embodiment, the diameter of the guide rod is D, the effective length of the guide rod for guiding the motion of the piston rod is H, and the relationship: 0.8D≦H≦3D is satisfied.

[0009] In one embodiment, the piston rod is provided with a first stop and a second stop at one end close to the inlet, and a groove is formed between the first stop and the second stop, the groove being used to position a seal member.

[0010] In one embodiment, the first stop portion includes a first peripheral wall portion, the enlarged diameter portion includes a second peripheral wall portion, and the included angle between an extension line of the first peripheral wall portion and the axis of the valve disc is defined as α, and the included angle between an extension line of the second peripheral wall portion and the axis of the valve disc is defined as β, where α and β satisfy the relationship: α>β, 0°<α<90°, 0°<β<90°.

[0011] In one embodiment, a first guide hole is drilled at one end of the piston rod close to the guide rod, and a second guide hole is drilled at one end of the guide rod close to the piston rod, the first guide hole and the second guide hole are communicated with each other, the one-way valve further includes an elastic member, both ends of the elastic member are respectively connected to the piston rod and the guide rod, and the elastic member is simultaneously located in the first guide hole and the second guide hole, the diameter of the first guide hole is defined as X, the diameter of the second guide hole is defined as Y, and the diameter of the elastic member is defined as Z, satisfying the relationship: X>Y>Z.

[0012] In one embodiment, an equalizing hole is formed at one end of the guide rod away from the piston rod. One end of the equalizing hole communicates with the second guide hole, and the other end of the equalizing hole communicates with the outlet.

[0013] In one embodiment, a third guide hole is further formed in the piston rod. The third guide hole communicates with the first guide hole, and the third guide hole is located at one end of the first guide hole away from the guide rod. If the aperture of the third guide hole is defined as W, the relational expression: Z < W < X is satisfied.

[0014] It can be understood that the installation of the third guide hole guides the elastic member, making it difficult for the elastic member to tilt when it expands, contracts and stretches, and enabling the piston rod to move more smoothly relative to the guide rod.

[0015] In one embodiment, a positioning member is further fixedly provided in the valve chamber. The positioning member is provided at one end of the guide rod away from the piston rod. A through hole is formed in the positioning member. The guide rod is inserted through the through hole and fixedly connected to the positioning member. The flow area of the positioning member is greater than or equal to the flow area of the valve port.

[0016] Details of one or more embodiments of the present application are described in the following drawings and description. Other features, objects and advantages of the present application will be apparent from the specification, drawings and claims.

Brief Description of the Drawings

[0017] To better describe and illustrate the embodiments and / or examples of those applications disclosed herein, one or more drawings can be referred to. Additional details or examples for describing the drawings should not be considered as limiting the scope of any of the disclosed applications, the embodiments and / or examples described herein, and the optimal models of these applications understood herein.

[0018] [Figure 1] FIG. 2 is a structural schematic diagram of a one-way valve in an open state according to one or more embodiments. [Diagram 2] FIG. 2 is a structural schematic diagram of a one-way valve in a closed state according to one or more embodiments. [Diagram 3] 1 is a structural schematic diagram of a valve disc according to one or more embodiments. [Figure 4] FIG. 2 is a structural schematic diagram of a piston rod according to one or more embodiments. [Diagram 5] FIG. 2 is a structural schematic diagram of a guide rod according to one or more embodiments.

[0019] The meanings of the symbols in the figure are as follows: 100 one-way valve, 10 valve body, 11 valve chamber, 12 valve port, 13 inlet, 14 outlet, 15 enlarged diameter portion, 151 second peripheral wall portion, 152 flare, 153 small diameter end, 20 piston unit, 21 piston rod, 211 first stop portion, 2111 first peripheral wall portion, 212 second stop portion, 213 groove, 214 first guide hole, 215 third guide hole, 216 limiting step, 22 sealing member, 30 guide rod, 31 second guide hole, 32 balancing hole, 40 elastic member, 50 positioning member, 51 through hole, 52 baffle, 53 circlip. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] Hereinafter, the technical aspects of the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, but it is clear that the described embodiments are merely some of the embodiments of the present application, and are not all of the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the scope of protection of the present application.

[0021] It should be noted that when an assembly is referred to as being "mounted" to another assembly, it may be mounted directly to the other assembly or there may be intervening assemblies. When an assembly is referred to as being "mounted" to another assembly, it may be mounted directly to the other assembly or there may be intervening assemblies. When an assembly is referred to as being "secured" to another assembly, it may be secured directly to the other assembly or there may be intervening assemblies.

[0022] All technical and scientific terms used in this application have the same meaning as commonly understood by those skilled in the art of the technical field of this application unless otherwise defined. The terms used in the specification of this application are merely for the purpose of describing specific embodiments and are not intended to limit the present application. The term "or" used in this application includes any and all combinations of one or more of the associated items listed.

[0023] Referring to FIG. 1 to FIG. 5, the one-way valve 100 provided in the present application can be applied to an air conditioner to prevent the reverse flow of refrigerant, and can also be used in a hydraulic system to prevent the reverse flow of oil, or in a pneumatic system to prevent the reverse flow of compressed air.

[0024] Specifically, the one-way valve 100 provided in the present application includes a valve body 10 and a piston unit 20, the valve body 10 includes a valve chamber 11 and a valve port 12, the valve body 10 is provided with an inlet 13 and an outlet 14, the valve port 12 is located between the inlet 13 and the valve chamber 11, and the outlet 14 is connected to the valve chamber 11, the piston unit 20 is movable along the axial direction of the valve body 10 in the valve chamber 11 to open and close the valve port 12, and the valve chamber 11 includes an enlarged diameter portion 15, the flow area of ​​which is greater than the flow area of ​​the valve port 12.

[0025] It should be noted that in the one-way valves of the related art, when the piston moves toward / away from the valve port in the valve chamber, there is always a risk of throttling caused by the expansion of the sealing member, which impedes the flow of refrigerant and affects the normal operation of the one-way valve. In this embodiment, the sealing member 22 is expanded by the refrigerant flowing through the valve chamber 11, which causes throttling during the operation stroke of the piston unit 20. Therefore, the one-way valve 100 provided in the present application provides an enlarged portion 15 in the valve body 10, so that the flow area in the valve chamber 11 is larger than the flow area of ​​the valve port 12, thereby avoiding the risk of throttling and improving the flow capacity.

[0026] Alternatively, the valve body 10 may be formed as a long cylinder having a hollow structure. In this embodiment, the valve body 10 is made of a copper casting. However, in other embodiments, the valve body 10 may be made of other materials such as cast iron, and this is not a limitation.

[0027] As shown in Figures 1 to 3, the flow area within the valve chamber 11 at one end close to the outlet 14 of the valve orifice 12 is larger than the flow area at the valve orifice 12, so there is no risk of throttling as the refrigerant flows from the valve orifice 12 to the outlet 14, which avoids flow obstruction and improves flow capacity.

[0028] Specifically, the inner wall of the enlarged diameter section 15 is a tapered surface, and this tapered surface flares toward the outlet 14, and the small diameter end of the enlarged diameter section 15 and the valve port 12 are connected to each other, so that the flow area gradually increases as the refrigerant flows from the inlet 13 through the valve port 12 and then from the enlarged diameter section 15 to the outlet 14. The advantage of providing the enlarged diameter section 15 as a tapered surface is that it provides a process in which the flow area of ​​the refrigerant gradually increases, so that a sudden increase in the flow area does not cause the refrigerant to exert too great an impact force in the valve chamber 11, damaging the valve body structure and ultimately affecting the normal operation of the one-way valve 100.

[0029] Furthermore, the one-way valve 100 further includes a guide rod 30, which is fixed within the valve chamber 11; the piston unit 20 includes a piston rod 21 and a seal member 22, one end of the piston rod 21 is engaged with the guide rod 30 and the other end is provided toward the valve orifice 12; the seal member 22 is attached to one end of the piston rod 21 toward the valve orifice 12; the piston rod 21 is movable along the axis of the valve body 10 by the guiding action of the guide rod 30, and opens and closes the valve orifice 12 by engaging the seal member 22.

[0030] As shown in FIG. 4, a first retaining portion 211 and a second retaining portion 212 are provided at one end of the piston rod 21 close to the inlet 13. A groove 213 is formed between the first retaining portion 211 and the second retaining portion 212. The groove 213 is used for positioning the sealing member 22. The first retaining portion 211 and the second retaining portion 212 retain the sealing member 22 at the front and rear, making the sealing member 22 less likely to fall off in different operating states of the one-way valve 100, which is helpful in improving the service life of the one-way valve 100 and ensuring stable sealing performance.

[0031] Alternatively, in this embodiment, the seal member 22 is made of rubber or plastic material, but it is understood that in other embodiments, the seal member 22 may be made of other materials, which are not limited herein.

[0032] Furthermore, the first stop portion 211 includes a first peripheral wall portion 2111, and the expanded diameter portion 15 includes a second peripheral wall portion 151. The angle between the extension line of the first peripheral wall portion 2111 and the axis of the valve body 10 is defined as α, and the angle between the extension line of the second peripheral wall portion 151 and the axis of the valve body 10 is defined as β. Then, α and β satisfy the following relations: α>β, 0°<α<90°, 0°<β<90°. In this way, when the piston rod 21 moves along the axis of the valve body 10 and abuts against the valve port 12, the first stop portion 211 and the expanded diameter portion 15 abut against each other to form a line seal, thereby enhancing the sealing performance and reducing the leakage rate.

[0033] It should be noted that the first peripheral wall portion 2111 is a tapered surface, and the maximum outer diameter of the first stop portion 211 is defined as D1, the maximum outer diameter of the second stop portion 212 is defined as D2, and the maximum outer diameter of the seal member 22 is defined as D3. D1, D2, and D3 satisfy the relation: D3>D2>D1. Thus, when the piston rod 21 moves along the axis of the valve body 10 and abuts against the valve port 12, the seal member 22 and the second peripheral wall portion 151 first abut against each other to form a first contact. As the pressure difference in the valve chamber 11 continues to increase, the piston rod 21 is pushed further towards the valve port 12, at which point the first stopper 211 comes into contact with the second peripheral wall portion 151, and since α>β, the first stopper 211 and the second peripheral wall portion 151 form a second line seal. By providing this in this manner, a reliable seal can be achieved regardless of the pressure value in the valve chamber 11, improving the sealing performance. 1, 2 and 5, the piston rod 21 has a first guide hole 214 at one end close to the guide rod 30, and the guide rod 30 has a second guide hole 31 at one end close to the piston rod 21, and the first guide hole 214 and the second guide hole 31 are communicated with each other. The one-way valve 100 further includes an elastic member 40, and the piston rod 21 and the guide rod 30 are respectively connected to both ends of the elastic member 40, and the elastic member 40 is simultaneously located in the first guide hole 214 and the second guide hole 31. The diameter of the first guide hole 214 is defined as X, the diameter of the second guide hole 31 is defined as Y, and the diameter of the elastic member 40 is defined as Z, which satisfies the relationship: X>Y>Z, so that the piston rod 21, the guide rod 30, and the elastic member 40 can be assembled more conveniently and quickly.

[0034] Furthermore, as shown in FIG. 4, a third guide hole 215 is further formed in the piston rod 21. The third guide hole 215 communicates with the first guide hole 214. The third guide hole 215 is located at one end of the first guide hole 214 away from the guide rod 30. Defining the aperture diameter of the third guide hole 215 as W, the relational expression: Z < W < X is satisfied. By providing the third guide hole 215, a guiding effect is exerted on the elastic member 40, making it difficult for the elastic member 40 to tilt when stretching and extending, and enabling the piston rod 21 to move more smoothly with respect to the guide rod 30.

[0035] It should be noted that if the third guide hole 215 with an aperture diameter smaller than that of the first guide hole 214 is not provided, when the piston rod 21 moves with respect to the guide rod 30 and the elastic member 40 extends or contracts along with the movement of the piston rod 21, the elastic member 40 is likely to tilt left and right, the elastic member 40 gets stuck inside the first guide hole 214, and the piston rod 21 cannot continue to move with respect to the guide rod 30, affecting the normal operation of the one-way valve 100. To solve such a problem, a third guide hole 215 with an aperture diameter slightly larger than the outer diameter of the elastic member 40 is formed in the piston rod 21, so that the elastic member 40 cannot swing left and right when stretching or compressing, improving the smoothness of the movement of the piston rod 21. Furthermore, by providing the third guide hole 215, a limiting step 216 is formed between the first guide hole 214 and the third guide hole 215, enabling the guide rod 30 to abut against the limiting step 216 when moving inside the first guide hole 214, thereby realizing the limiting effect on the guide rod 30.

[0036] Optionally, in this embodiment, the elastic member 40 is selected as a spring. However, naturally, in other embodiments, the elastic member 40 may be selected as other members, which is not limited herein.

[0037] In addition, as shown in FIG. 5, a balancing hole 32 is drilled at one end of the guide rod 30 away from the piston rod 21, one end of the balancing hole 32 is connected to the second guide hole 31, and the other end of the balancing hole 32 is connected to the outlet 14, thereby reducing the resistance to the piston rod 21, making it easier for the piston rod 21 to move between the inlet 13 and the outlet 14, reducing the fluid resistance, and improving the flow capacity of the refrigerant in the valve chamber 11.

[0038] Specifically, the diameter of the guide rod 30 is D, the effective length of the guide rod 30 for guiding the movement of the piston rod 21 is defined as H, and the relational formula: 0.8D≦H≦3D is satisfied. If the guide length H is too short, the piston rod 21 is likely to stop during its guiding movement on the guide rod 30, which will affect the normal operation of the one-way valve 100. If the guide length H is too long, it will increase the material costs. Therefore, the guide length H is limited to 0.8D≦H≦3D, so as to avoid the obstruction of the flow of the refrigerant in the valve chamber 11 and improve the flow performance of the refrigerant, on the premise of saving the material costs.

[0039] The first guide hole 214 of the piston rod 21 is provided with a communication hole (not shown) that extends radially and connects the first guide hole 214 to the outside of the piston rod 21. The communication hole is provided on one side of the first guide hole 214 away from the guide rod 30. At least one communication hole may be provided, and when multiple communication holes are provided, the multiple communication holes are provided at intervals in the circumferential direction of the first guide hole.

[0040] Furthermore, a positioning member 50 is fixedly provided within the valve chamber 11. The positioning member 50 is provided at one end of the guide rod 30 remote from the piston rod 21. A through hole 51 is drilled in the positioning member 50. The guide rod 30 is inserted through the through hole 51 and fixedly connected to the positioning member 50.

[0041] Specifically, the positioning member 50 includes a baffle 52 and a circlip 53, and the baffle 52 is fixed between the guide rod 30 and the circlip 53, so that after the baffle 52 is restricted by the circlip 53, there is no movement space in the axial direction of the valve body 10.

[0042] The technical features of the above embodiments can be combined in any manner, and for the sake of brevity, not all possible combinations of the technical features in the above embodiments are described; however, as long as there is no contradiction in the combination of these technical features, all of them should be considered within the scope described in this specification.

[0043] The above examples merely show some embodiments of the present application, and although the description is relatively specific and detailed, it should not be understood as limiting the scope of the claims of the present application. It should be pointed out that those skilled in the art can make some modifications and improvements without departing from the spirit of the present application, and all of these are included in the scope of protection of the present application. Therefore, the scope of protection of the patent of the present application should be according to the scope of the attached claims.

Claims

1. a valve body and a piston unit, the valve body including a valve chamber and a valve port, the valve body having an inlet and an outlet, the valve port being located between the inlet and the valve chamber, the outlet being connected to the valve chamber, the piston unit being movable in the valve chamber along an axial direction of the valve body to open and close the valve port, the valve chamber includes an expanded diameter portion, the flow area of ​​the expanded diameter portion being greater than the flow area of ​​the valve port; a guide rod fixed within the valve chamber, the piston unit including a piston rod and a seal member; A first guide hole is formed in one end of the piston rod close to the guide rod, A one-way valve, wherein a first guide hole of the piston rod is provided with a communication hole extending in a radial direction and communicating the first guide hole with an outside of the piston rod.

2. 2. The one-way valve according to claim 1, wherein an inner wall of the expanded diameter portion is a tapered surface, the tapered surface is a flare toward the outlet, and the small diameter end of the expanded diameter portion and the valve port are in communication with each other.

3. A one-way valve as described in claim 1, wherein one end of the piston rod is engaged with the guide rod and the other end is disposed toward the valve orifice, the sealing member is attached to the end of the piston rod toward the valve orifice, the piston rod is movable along the axis of the valve body by the guiding action of the guide rod, and the sealing member is linked to open and close the valve orifice.

4. 2. The one-way valve of claim 1, wherein a flow area within the valve chamber at one end of the valve port closer to the outlet is greater than a flow area at the valve port.

5. 4. The one-way valve according to claim 3, wherein the diameter of the guide rod is D, the effective length of the guide rod for guiding the movement of the piston rod is H, and the relationship: 0.8D≦H≦3D is satisfied.

6. 4. The one-way valve according to claim 3, wherein the piston rod is provided with a first stop portion and a second stop portion at one end close to the inlet, and a groove is formed between the first stop portion and the second stop portion, and the groove is used to position the seal member.

7. 7. The one-way valve according to claim 6, wherein a maximum outer diameter of the first stop portion is defined as D1, a maximum outer diameter of the second stop portion is defined as D2, and a maximum outer diameter of the sealing member is defined as D3, and D1, D2, and D3 satisfy a relationship: D3 > D2 > D1.

8. 7. The one-way valve according to claim 6, wherein the first stop portion includes a first circumferential wall portion, the enlarged diameter portion includes a second circumferential wall portion, an included angle between an extension line of the first circumferential wall portion and an axis of the valve disc is defined as α, and an included angle between an extension line of the second circumferential wall portion and the axis of the valve disc is defined as β, where α and β satisfy the following relationship: α > β, 0° < α < 90°, 0° < β < 90°.

9. A second guide hole is drilled in one end of the guide rod close to the piston rod, the first guide hole and the second guide hole are connected to each other, the one-way valve further includes an elastic member, the piston rod and the guide rod are connected to both ends of the elastic member, and the elastic member is simultaneously located in the first guide hole and the second guide hole, 4. The one-way valve according to claim 3, wherein a diameter of the first guide hole is defined as X, a diameter of the second guide hole is defined as Y, and a diameter of the elastic member is defined as Z, satisfying a relational formula: X>Y>Z.

10. 10. The one-way valve according to claim 9, wherein a balancing hole is drilled in one end of the guide rod remote from the piston rod, one end of the balancing hole is connected to the second guide hole, and the other end of the balancing hole is connected to the outlet.

11. a third guide hole is further formed in the piston rod, the third guide hole and the first guide hole are connected to each other, and the third guide hole is located at one end of the first guide hole away from the guide rod, The one-way valve according to claim 9 , wherein, when a hole diameter of the third guide hole is defined as W, a relational expression: Z<W<X is satisfied.

12. 4. The one-way valve according to claim 3, further comprising a positioning member fixedly provided within the valve chamber, the positioning member being provided at one end of the guide rod remote from the piston rod, the positioning member having a through hole, the guide rod being inserted through the through hole and fixedly connected to the positioning member, and a flow area of ​​the positioning member being equal to or larger than a flow area of ​​the valve port.

13. 13. The one-way valve of claim 12, wherein the positioning member includes a baffle and a circlip, the baffle being secured between the guide rod and the circlip.

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