Integrated throttling one-way valve

Abstract

The integrated throttling one-way valve comprises a valve seat, a valve cavity is formed in the valve seat, the axial section of the valve cavity is of a streamline structure with the middle contracting in an arc shape and the two ends expanding in a horn shape, and a valve port part used for being matched with a valve element is arranged at one end of the valve cavity; the valve sleeve is fixedly arranged relative to the valve seat, an inner cavity of the valve sleeve can be communicated with a valve cavity of the valve seat, a diameter expanding section is arranged in the valve sleeve, and a liquid through hole is formed in the circumferential direction of the diameter expanding section; compared with a traditional straight-through hole structure, the streamline valve cavity structure with the arc-shaped shrinkage middle portion and the trumpet-shaped expansion two ends is arranged in the valve seat, fluid can be more stably transited in the valve cavity, turbulent flow and vortex caused by abrupt change of the section are avoided, flowing resistance is effectively reduced, fluid passing efficiency is improved, and the service life of the valve is prolonged. Meanwhile, by means of the structure, deviation impact of fluid on the valve element can be reduced, and the service life of the valve element is prolonged.

Description

Technical Field

[0001] This application relates to the field of valve technology, and in particular to an integrated throttling check valve. Background Technology

[0002] A throttle valve is a device that controls flow rate and pressure by adjusting the cross-section of fluid flow. It is widely used in various hydraulic, pneumatic, and air conditioning systems. A check valve, on the other hand, allows fluid to flow freely in one direction and automatically closes in the opposite direction. To save installation space, simplify piping structure, and improve system integration, some applications require integrating the functions of a throttle valve and a check valve into a single integrated throttle check valve. This type of integrated structure can provide a unidirectional flow check function while achieving flow control, and has the advantages of compact structure and multifunctional design.

[0003] However, existing integrated throttling check valves still have several structural defects. First, the valve seat typically uses a straight-through hole structure with only a flared valve port at one end. This structure cannot form an effective guiding surface during operation, causing the fluid to veer sharply in the valve cavity, easily forming turbulence and eddies. This not only increases flow resistance but also reduces the stability of the throttling effect. Second, traditional valve sleeves require circumferential holes for fluid passage. However, due to the sliding fit between the valve core and the valve sleeve, there is only a limited clearance. Burrs are easily generated during the machining of the passage holes, causing the valve core to jam. Furthermore, when the valve core is closed, the fluid action on the valve core can cause valve core shaking and unstable operation. Third, to achieve the throttling function, a spring is often installed inside the valve core to drive the valve needle to return to its original position. However, existing structures lack effective compression limits, causing the spring to be over-compressed during frequent operation, eventually leading to spring fatigue and damage, affecting the valve's service life and reliability. Utility Model Content

[0004] To address the problems mentioned in the background art, such as the formation of turbulent eddies in the valve cavity, easy jamming and shaking of the valve core, and damage to the spring due to excessive compression during throttling, this application provides an integrated throttling check valve.

[0005] The integrated throttling check valve provided in this application adopts the following technical solution:

[0006] An integrated throttling check valve includes:

[0007] The valve seat has a valve cavity inside. The axial cross-section of the valve cavity has a streamlined structure with an arc-shaped contraction in the middle and a trumpet-shaped expansion at both ends. One end is provided with a valve port for cooperating with the valve core.

[0008] A valve sleeve is fixed relative to the valve seat, and its inner cavity is connected to the valve cavity of the valve seat. The valve sleeve has an enlarged diameter section, and the enlarged diameter section has a liquid passage hole in the circumferential direction.

[0009] A throttling assembly includes a valve core that is axially movable within a valve sleeve cavity. When the valve core is axially moved to a position that fits against the valve port, the valve cavity is isolated from the liquid passage. When the valve core moves away from the valve port, the valve cavity communicates with the liquid passage.

[0010] There is a gap between the outer wall of the valve core and the inner wall of the expansion section, and the medium can enter the gap through the liquid passage.

[0011] By adopting the above technical solution, and by providing a streamlined valve cavity structure with a central arc-shaped contraction and two flared expansion ends inside the valve seat, compared with the traditional straight-through hole structure, the fluid can transition more smoothly in the valve cavity, avoiding turbulence and eddies caused by abrupt changes in cross-section, effectively reducing flow resistance, improving fluid throughput efficiency, and enhancing the stability and response speed of throttling control. At the same time, this structure can also reduce the deflection impact of the fluid on the valve core and extend the service life of the valve core.

[0012] An enlarged section is provided in the inner cavity of the valve sleeve at the position of the fluid passage hole, so that the valve core and the valve sleeve form a gap in this area. This is to prevent the valve core from getting stuck due to the machining burrs of the fluid passage hole during the axial movement of the valve core. Furthermore, the gap structure allows fluid to enter the gap when the valve is closed, thereby making the force on all positions in the circumferential direction of the valve core uniform and stable, avoiding the problem of valve core vibration, and improving the performance of the valve.

[0013] Optionally, the fluid passage and the enlarged diameter section are disposed on the valve sleeve in the direction close to the valve port.

[0014] By adopting the above technical solution, the fluid can quickly pass through the liquid passage and continue to flow forward during the valve core opening process, which can improve both the response speed of the valve core and the efficiency of fluid passage.

[0015] Optionally, the valve core has a reduced diameter section on its outer wall near the valve port, and the valve core has an opening at its end near the valve port.

[0016] By adopting the above technical solution, the reduced diameter section can be combined with the expanded diameter section of the valve sleeve inner wall to further increase the space of the gap area between the two, so as to balance the pressure around the valve core and prevent the valve core from shaking and generating noise; the opening is set so that the medium can flow from the inner cavity of the valve core to the inner cavity of the valve seat during the throttling operation, thereby achieving the throttling effect.

[0017] Optionally, the throttling component further includes:

[0018] The movable seat is axially movable and is disposed in the inner cavity of the valve core, and has a guide hole that runs through it along its axial direction.

[0019] A spring is installed inside the valve core cavity, with one end abutting against the movable seat and the other end abutting against the inner wall of the valve core end.

[0020] A fixed seat, which is sealed to the valve core, and has a throttling orifice extending through it along its axial direction;

[0021] The valve needle is mounted on a movable seat and is designed to cooperate with the throttling orifice to achieve a throttling effect.

[0022] By adopting the above technical solution, the integrated effect of throttle valve and check valve can be achieved. It has the characteristics of compact structure and is easy to realize the functions of throttling and check valve.

[0023] Optionally, the inner wall of the valve core is provided with a stepped portion extending towards its center. When the movable seat moves along its axial direction to the first limit position, it can abut against the stepped portion. When the movable seat moves along its axial direction to the second limit position, it can abut against the fixed seat.

[0024] By adopting the above technical solution, the movable seat moves back and forth between the step and the fixed seat, forming a reliable mechanical limiting structure. This can prevent the movable seat from overtravel and also protect the spring, preventing it from being overcompressed and deformed or damaged.

[0025] Optionally, the valve sleeve is provided with a limiting structure at one end away from the valve port to prevent the valve core from disengaging from the valve sleeve.

[0026] Optionally, the limiting structure is a constricted portion disposed at the end of the valve sleeve and folded inward, wherein the inner diameter of the constricted portion is smaller than the outer diameter of the valve core.

[0027] By adopting the above technical solution, the valve core is axially limited by directly setting a constriction at the end of the valve sleeve, which has the advantages of simple structure and low cost.

[0028] Optionally, it also includes a valve tube, which is sealed to the valve seat and the inner cavity of the valve tube is connected to the valve cavity of the valve seat. A flow passage is formed between the valve tube and the valve sleeve, and the flow passage is connected to the liquid passage.

[0029] By adopting the above technical solution and setting the valve pipe as a connector, external pipelines can be connected to form a complete fluid flow path, and the normal flow of fluid in the valve pipe can be achieved through the flow channel.

[0030] Optionally, it also includes a filter screen, which is disposed inside the valve tube, and there are two filter screens, with the valve seat and valve sleeve respectively disposed between the two filter screens.

[0031] By adopting the above technical solution, the dual-filter structure can filter impurities in both directions, improve fluid cleanliness, protect the throttling components from foreign matter, and extend their service life.

[0032] Optionally, the connection method between the valve seat and the valve sleeve includes, but is not limited to, the following:

[0033] The valve seat and valve sleeve are integrally formed;

[0034] The valve seat and valve sleeve are separate structures, and the valve sleeve is integrally stamped and formed, and the valve sleeve is fixed on the valve seat.

[0035] By adopting the above technical solutions, various connection forms of valve seats and valve sleeves are provided, enhancing the diversity and adaptability of assembly methods and facilitating rapid assembly and maintenance under different process requirements. Among them, the valve seat and valve sleeve are integrally formed, which can improve the stability of the connection structure between the two, while the valve sleeve is separately stamped into an integral form, which can improve its forming efficiency and is conducive to mass production and processing.

[0036] In summary, this application includes at least one of the following beneficial technical effects:

[0037] This invention features a streamlined valve cavity structure with a central arc-shaped contraction and two flared expansion ends. Compared to traditional straight-through hole structures, this design allows for a smoother fluid transition within the valve cavity, avoiding turbulence and eddies caused by abrupt changes in cross-section. This effectively reduces flow resistance, improves fluid throughput, and enhances the stability and response speed of throttling control. Furthermore, this structure reduces the eccentric impact of the fluid on the valve core, extending its service life.

[0038] This invention features an enlarged section within the valve sleeve cavity, located at the fluid passage hole. This creates a gap between the valve core and the valve sleeve within this area. This prevents the valve core from jamming due to machining burrs in the fluid passage hole during axial movement. Furthermore, the gap structure allows fluid to enter the gap when the valve is closed, resulting in uniform and stable force distribution across the circumference of the valve core. This prevents valve core vibration and improves the valve's performance.

[0039] This utility model has a stepped portion extending towards the center on the inner wall of the valve core, which can form a reliable mechanical limiting structure for the movable seat, thereby protecting the spring and preventing the spring from being deformed and damaged due to excessive compression. Attached Figure Description

[0040] Figure 1 This is a structural diagram of the first usage state of this utility model;

[0041] Figure 2This is a structural diagram of the second usage state of this utility model;

[0042] Figure 3 This is a utility model Figure 1 A magnified view of a portion of the view;

[0043] Figure 4 This is a structural diagram of the concealed valve tube and filter screen of this utility model;

[0044] Figure 5 This is a structural diagram of the connection between the valve seat and the valve sleeve of this utility model;

[0045] Figure 6 This is a structural diagram of the valve core of this utility model.

[0046] Explanation of reference numerals in the attached figures:

[0047] 1. Valve tube; 2. Valve seat; 201. Valve cavity; 202. Valve port; 3. Valve sleeve; 301. Expanded diameter section; 302. Liquid passage hole; 303. Narrowing section; 4. Valve core; 401. Narrowing diameter section; 402. Opening section; 403. Stepped section; 5. Spring; 6. Movable seat; 601. Guide hole; 7. Fixed seat; 701. Throttling hole; 8. Valve needle; 9. Flow passage; 10. Filter screen; 11. Gap. Detailed Implementation

[0048] The present application will be further described in detail below with reference to the accompanying drawings.

[0049] like Figure 1-6 As shown in the figure, this application discloses an integrated throttling check valve, comprising:

[0050] Valve seat 2, the valve seat 2 having a valve cavity 201 inside, the valve cavity 201 having a streamlined structure with an arc-shaped contraction in the middle and a flared expansion at both ends in an axial cross-section, one end of which has a valve port 202 for cooperating with the valve core 4; as Figure 1-5 As shown, when the valve seat 2 is cut open along the axis of the valve cavity 201, the internal structure of the valve cavity 201 gradually contracts from both ends towards the middle, reaching its narrowest point in the middle, and then gradually expands towards the other end. The narrowest point has an arc-shaped transition, forming an overall streamlined transition profile. The trumpet-shaped expansion structure at both ends can guide and buffer the fluid entering and exiting the valve cavity 201, making the pressure fluctuation of the fluid smaller when entering or leaving, reducing local impact and turbulence. This streamlined structure eliminates the sharp angle abrupt change and abrupt change in flow resistance problems in the traditional straight-through hole structure, thereby effectively reducing pressure loss and energy loss, and improving fluid throughput efficiency.

[0051] The valve sleeve 3 is fixedly disposed relative to the valve seat 2, and its inner cavity is connected to the valve cavity 201 of the valve seat 2. The valve sleeve 3 is provided with an enlarged diameter section 301, and the enlarged diameter section 301 is provided with liquid passage holes 302 in the circumferential direction. The number of liquid passage holes 302 can be set and evenly distributed around the center of the valve sleeve 3, so that when the fluid passes through the liquid passage holes 302, it forms an overall balanced flow path. In this example, the liquid passage holes 302 and the enlarged diameter section 301 are set on the valve sleeve 3 near the valve port 202, so that after the valve core 4 opens the valve, the fluid can quickly pass through the liquid passage holes 302 from the valve cavity 201 of the valve seat 2 and continue to flow.

[0052] In this example, the valve seat 2 and the valve sleeve 3 are integrally formed;

[0053] It is understandable that the valve seat 2 and the valve sleeve 3 can also be separate structures, and the valve sleeve 3 is integrally stamped and formed, and the valve sleeve 3 is fixed on the valve seat 2.

[0054] The throttling assembly includes a valve core 4 that is axially movable and disposed in the inner cavity of the valve sleeve 3. When the valve core 4 is axially moved to a state that fits against the valve port 202, the valve cavity 201 is isolated from the liquid passage 302. When the valve core 4 moves away from the valve port 202, the valve cavity 201 is connected to the liquid passage 302.

[0055] A gap 11 is formed between the outer wall of the valve core 4 and the inner wall of the expansion section 301, allowing the medium to enter the gap 11 through the liquid passage 302. In the closed state, some fluid can fill the gap 11, ensuring uniform force on the valve core 4 in the circumferential direction and preventing it from shaking.

[0056] Specifically, the valve core 4 has a reduced diameter section 401 formed on the outer wall near the valve port 202, and the end of the valve core 4 near the valve port 202 has an opening 402. The area where the reduced diameter section 401 is located is in the area that matches the expanded diameter section 301 of the valve sleeve 3, thereby further increasing the space of the gap 11 between the valve sleeve 3 and the valve core 4 and further preventing the valve core 4 from shaking. The opening 402 facilitates the flow of fluid from the inner cavity of the valve core 4 through the opening 402 into the valve cavity 201 during the throttling process. The opening 402 can be designed as a single circular hole structure or as multiple evenly distributed circular holes opened at the end of the valve core 4, which can play a role in multi-hole noise reduction.

[0057] Specifically, the throttling component further includes:

[0058] The movable seat 6 is axially movable and is disposed in the inner cavity of the valve core 4. It is provided with a guide hole 601 that is provided through it along its axial direction. There are multiple guide holes 601 and they are evenly distributed around the center of the movable seat 6. In the throttling state, the fluid passes through the movable seat 6 and continues to flow towards the valve port 202.

[0059] Spring 5 is installed in the inner cavity of valve core 4, with one end abutting against the movable seat 6 and the other end abutting against the inner wall of valve core 4.

[0060] The fixed seat 7 is sealed to the valve core 4 and has a throttling hole 701 that is provided through it along its axial direction. The fixed seat 7 can be connected to the end of the valve core 4 by welding or threaded connection. On the one hand, it can form a throttling hole 701 on it, and on the other hand, it can also play an axial limiting role for the movable seat 6.

[0061] The valve needle 8 is mounted on the movable seat 6 and is configured to cooperate with the throttling orifice 701 to achieve a throttling effect. The valve needle 8 can be integrally formed with the movable seat 6, or the valve core 4 can be fixedly connected and mounted on the movable seat 6. During operation, the valve needle 8 and the movable seat 6 move axially in sync.

[0062] Specifically, the inner wall of the valve core 4 is provided with a stepped portion 403 extending towards its center. When the movable seat 6 moves along its axial direction to its first limit position, it can abut against the stepped portion 403. When the movable seat 6 moves along its axial direction to its second limit position, it can abut against the fixed seat 7. More specifically, the stepped portion 403 can be formed simultaneously during the forming process of the reduced diameter section 401. The stepped portion 403 can mechanically limit the movable seat 6, avoiding the problem of spring 5 failure due to excessive compression.

[0063] Specifically, the valve sleeve 3 is provided with a limiting structure at the end away from the valve port 202 to prevent the valve core 4 from disengaging from the valve sleeve 3. More specifically, the limiting structure is a constricted portion 303 provided at the end of the valve sleeve 3 and folded inward. The inner diameter of the constricted portion 303 is smaller than the outer diameter of the valve core 4. When the valve core 4 moves to its limit position away from the valve port 202, it can contact the inner wall of the constricted portion 303 to achieve the effect of axial limiting.

[0064] Specifically, it also includes a valve pipe 1, which is sealed to the valve seat 2, and the inner cavity of the valve pipe 1 is connected to the valve cavity 201 of the valve seat 2. A flow passage 9 is formed between the valve pipe 1 and the valve sleeve 3, and the flow passage 9 is connected to the liquid passage 302. In this example, the valve pipe 1 and the valve seat 2 are specifically connected and fixed by welding or spinning. When the valve core 4 is in the open state, as... Figure 1 As shown, the fluid flows from top to bottom, passing through the liquid passage 302 into the flow channel 9, and then continues to flow downwards from the flow channel 9, maintaining the unobstructed flow of fluid inside the valve; when the valve core 4 is in the closed state, as... Figure 2As shown, the fluid flows from bottom to top, and some of the fluid can enter the gap 11 through the flow channel 9 and the liquid passage 302, so that the valve core 4 is subjected to uniform force in the circumferential direction and the valve core 4 is prevented from shaking. When the valve core 4 is closed (not shown in the figure), the fluid flows from bottom to top and the force is greater than the elastic force of the spring 5, which can push the valve needle 8 upward. The fluid can enter the interior of the valve core 4 through the throttling orifice 701 and continue to flow upward from the opening 402 above the valve core 4, which can achieve the throttling effect.

[0065] Specifically, it also includes a filter screen 10, which is disposed inside the valve pipe 1, and there are two of them. The valve seat 2 and the valve sleeve 3 are respectively disposed between the two filter screens 10.

[0066] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An integrated throttling check valve, characterized in that, include: Valve seat (2), the valve seat (2) has a valve cavity (201) inside, the axial section of the valve cavity (201) is a streamlined structure with a central arc-shaped contraction and two ends flared expansion, one end of which is provided with a valve port (202) for cooperating with the valve core (4). The valve sleeve (3) is fixedly set relative to the valve seat (2), and its inner cavity is connected to the valve cavity (201) of the valve seat (2). The valve sleeve (3) is provided with an expansion section (301), and the expansion section (301) is provided with a liquid passage hole (302) in the circumferential direction. The throttling assembly includes a valve core (4) that is axially movable and disposed in the inner cavity of the valve sleeve (3). When the valve core (4) is axially moved to a position that fits against the valve port (202), the valve cavity (201) is isolated from the liquid passage (302); when the valve core (4) moves away from the valve port (202), the valve cavity (201) communicates with the liquid passage (302). Among them, a gap (11) is formed between the outer wall of the valve core (4) and the inner wall of the expansion section (301), and the medium can enter the gap (11) through the liquid passage (302).

2. The integrated throttling check valve according to claim 1, characterized in that, The liquid passage (302) and the enlarged diameter section (301) are located on the valve sleeve (3) in the direction close to the valve port (202).

3. The integrated throttling check valve according to claim 1, characterized in that, The valve core (4) has a reduced diameter section (401) formed on the outer wall near the valve port (202), and the valve core (4) has an opening (402) at the end near the valve port (202).

4. An integrated throttling check valve according to claim 1, characterized in that, The throttling component also includes: The movable seat (6) is axially movable in the inner cavity of the valve core (4) and has a guide hole (601) that runs through it along its axial direction. Spring (5) is installed in the inner cavity of valve core (4), with one end abutting against the movable seat (6) and the other end abutting against the inner wall of valve core (4). The fixed seat (7) is sealed to the valve core (4) and has a throttling hole (701) that runs through it along its axial direction. The valve needle (8) is mounted on the movable seat (6) and is configured to cooperate with the throttling orifice (701) to achieve the throttling effect.

5. An integrated throttling check valve according to claim 4, characterized in that, The valve core (4) has a stepped portion (403) extending towards its center on its inner wall. When the movable seat (6) moves along its axis to the first limit position, it can abut against the stepped portion (403). When the movable seat (6) moves along its axis to the second limit position, it can abut against the fixed seat (7).

6. An integrated throttling check valve according to claim 4, characterized in that, The valve sleeve (3) is provided with a limiting structure at one end away from the valve port (202) to prevent the valve core (4) from disengaging from the valve sleeve (3).

7. An integrated throttling check valve according to claim 6, characterized in that, The limiting structure is a constricted portion (303) set at the end of the valve sleeve (3) and folded inward, the inner diameter of the constricted portion (303) being smaller than the outer diameter of the valve core (4).

8. An integrated throttling check valve according to claim 1, characterized in that, It also includes a valve tube (1), which is sealed to the valve seat (2), and the inner cavity of the valve tube (1) is connected to the valve cavity (201) of the valve seat (2). A flow passage (9) is formed between the valve tube (1) and the valve sleeve (3), and the flow passage (9) is connected to the liquid passage (302).

9. An integrated throttling check valve according to claim 8, characterized in that, It also includes a filter screen (10), which is set inside the valve tube (1) and there are two of them. The valve seat (2) and valve sleeve (3) are respectively set between the two filter screens (10).

10. An integrated throttling check valve according to any one of claims 1-9, characterized in that, The connection between the valve seat (2) and the valve sleeve (3) includes, but is not limited to, the following methods: The valve seat (2) and the valve sleeve (3) are integrally formed; The valve seat (2) and the valve sleeve (3) are separate structures, and the valve sleeve (3) is integrally stamped and formed, and the valve sleeve (3) is fixed on the valve seat (2).

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