Integrated throttle check valve

Abstract

This application relates to an integrated throttling check valve, comprising: a valve seat having a through cavity inside, one end of which is formed with a valve port; a valve sleeve connected to the end of the valve seat near the valve port, with its inner cavity communicating with the inner cavity of the valve seat, and a fluid passage hole provided in the circumferential direction of the valve sleeve; and a throttling assembly including a valve core axially movable and disposed in the inner cavity of the valve sleeve, wherein when the valve core is axially moved to fit the valve port; the present invention provides an enlarged diameter section 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, which is used to avoid the valve core from getting stuck due to the machining burrs of the fluid passage hole during the axial movement of the valve core, and because of the gap structure, fluid can enter into the gap in the closed state, 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 valve's performance.

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] Check valves and throttle valves are two common fluid control components. Check valves (also known as one-way valves) control fluid flow in only one direction to prevent backflow, and are commonly used in pressure maintenance and system protection applications. Throttle valves, on the other hand, control flow rate by adjusting the opening of the passage, and are typically used in applications with high control requirements such as speed regulation and flow limiting. To simplify system structure, reduce installation space, and improve integration, some existing technologies integrate the functions of check valves and throttle valves into the same valve body structure, giving it both flow regulation and check valve functions.

[0003] However, existing integrated throttling check valves still have some technical defects in their structural design. On the one hand, in order to achieve normal fluid flow, fluid passage holes are usually opened on the outer circumference of the valve sleeve. However, during the processing, burrs will be generated on the edges of these fluid passage holes, causing the valve core to be obstructed during axial movement. In severe cases, this may cause jamming, affecting the valve's response performance. Moreover, since the valve sleeve and valve core are in a sliding fit, the valve core is prone to vibration and increased noise under the force of the fluid when the valve is closed. On the other hand, the throttling component is often equipped with a spring to control the reset of the valve needle. However, in actual working conditions, the fluid will exert a large impact force on the moving component under high pressure or high flow rate conditions, which will cause the spring to be continuously and excessively compressed. Long-term use is prone to elastic failure or deformation, thereby losing the accuracy of throttling regulation and affecting the stability and reliability of the overall system. Utility Model Content

[0004] To address the issues of low precision and poor consistency in existing throttling valves mentioned in the background art, 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 through cavity inside, and a valve port is formed at one end of the cavity;

[0008] A valve sleeve is connected to one end of the valve seat near the valve port, and its inner cavity is connected to the inner cavity of the valve seat. A liquid passage hole is provided in the circumferential direction of the valve sleeve.

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

[0010] The valve sleeve has an enlarged section formed on the inner wall of the liquid passage hole, so that a gap is formed between the valve core and the valve sleeve at the position of the enlarged section, and the medium can enter the gap through the liquid passage hole.

[0011] By adopting the above technical solution, an expansion section is set in the inner cavity of the valve sleeve at the position of the liquid passage hole, so that a gap is formed between the valve core and the valve sleeve in this area. This is to avoid the valve core from getting stuck due to the machining burrs of the liquid passage hole during the axial movement of the valve core. Furthermore, due to the formation of the gap structure, fluid can 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 valve's performance.

[0012] Optionally, the fluid passage is located on the circumference of the valve sleeve near the valve port.

[0013] 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.

[0014] 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.

[0015] 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, so as to balance the pressure around the valve core and prevent the valve core from shaking and generating noise. The opening is designed 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.

[0016] Optionally, the throttling component further includes:

[0017] The movable seat is axially movable within the valve core cavity and has a second flow passage extending through it along its axial direction.

[0018] 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.

[0019] A fixed seat, which is sealed to the valve core, and has a throttling orifice extending through it along its axial direction;

[0020] The valve needle is mounted on a movable seat and is designed to cooperate with the throttling orifice to achieve a throttling effect.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] Optionally, one end of the outer wall of the fixing seat is provided with a tapered portion, and the inner wall of the constricted portion is a tapered structure that matches the tapered portion.

[0028] By adopting the above technical solution, when the valve core and the fixed seat move axially, the conical part can contact the conical structure of the inner wall of the constricted part to achieve conical surface contact, which can achieve precise positioning and reduce the problem of large noise caused by impact between parts.

[0029] Optionally, the limiting structure is a limiting ring installed at the end of the valve sleeve, wherein the inner diameter of the limiting ring is smaller than the outer diameter of the valve core.

[0030] By adopting the above technical solution, the valve core can also be axially limited by the setting of the limiting ring to prevent it from detaching from the valve sleeve. In addition, the setting of the limiting ring can also strengthen the overall structure of the valve sleeve and play a role in preventing the valve sleeve from deforming.

[0031] Optionally, one end of the outer wall of the fixing seat is provided with a tapered portion, and the inner wall of the limiting ring has a tapered structure that matches the tapered portion.

[0032] By adopting the above technical solution and using a conical surface contact method, the valve core can be accurately positioned, and the problem of excessive noise caused by impact between components can be reduced.

[0033] 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 inner cavity of the valve seat. A first flow passage is formed between the valve tube and the valve sleeve, and the first flow passage is connected to the liquid passage hole.

[0034] 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 first flow channel.

[0035] 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.

[0036] 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.

[0037] Optionally, one of the filters is installed at the end of the valve seat.

[0038] By adopting the above technical solution, the filter screen and valve seat can be installed as an integral structure inside the valve pipe, which has the advantages of easy assembly and disassembly.

[0039] Optionally, there are two valve seats, two valve sleeves, and two throttling components, and the valve ports of the valve seats are arranged facing each other.

[0040] By adopting the above technical solution and using a symmetrical dual-group structure design, bidirectional throttling and check flow control can be achieved, improving the application flexibility of the device and meeting the control requirements of different installation spaces and flow directions.

[0041] Optionally, the connection method between the valve seat and the valve sleeve includes, but is not limited to, the following:

[0042] The valve seat and valve sleeve are integrally formed;

[0043] 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.

[0044] 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.

[0045] In summary, this application includes at least one of the following beneficial technical effects:

[0046] 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.

[0047] 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

[0048] Figure 1 This is a structural diagram of the valve core opening mechanism according to Embodiment 1 of this utility model;

[0049] Figure 2 This is a structural diagram of the valve core closing valve according to Embodiment 1 of this utility model;

[0050] Figure 3 This is a partial schematic diagram of Embodiment 1 of the present utility model;

[0051] Figure 4 This is a partial schematic diagram of the hidden valve pipe and filter screen in Embodiment 1 of this utility model;

[0052] Figure 5 This is a structural diagram of the valve core according to Embodiment 1 of this utility model;

[0053] Figure 6 This is a partial schematic diagram of the concealed valve pipe and filter screen in Embodiment 2 of this utility model;

[0054] Figure 7 This is a partial schematic diagram of the concealed valve pipe and filter screen in Embodiment 3 of this utility model;

[0055] Figure 8 This is a structural diagram of the filter screen installed at the end of the valve seat in Embodiment 4 of this utility model;

[0056] Figure 9 This is a structural diagram of the bidirectional throttling check valve, which is an embodiment of this utility model.

[0057] Explanation of reference numerals in the attached figures:

[0058] 1. Valve tube; 2. Valve seat; 201. Valve port; 3. Spring; 4. Valve sleeve; 401. Liquid passage hole; 402. Narrowing section; 403. Expanding section; 5. Valve core; 501. Narrowing section; 502. Opening section; 503. Stepped section; 6. Movable seat; 7. Fixed seat; 701. Tapered section; 702. Throttling orifice; 8. First flow passage; 9. Second flow passage; 10. Valve needle; 11. Filter screen; 12. Limiting ring; 13. Clearance. Detailed Implementation

[0059] The present application will be further described in detail below with reference to the accompanying drawings.

[0060] Example 1

[0061] like Figure 1-5 As shown in the figure, this application discloses an integrated throttling check valve, comprising:

[0062] The valve seat 2 has a through cavity inside, and a valve port 201 is formed at one end of the cavity. In this embodiment, the valve port 201 has a conical flared structure, and the valve core 5 can abut against the inner wall of the valve port 201 to achieve the valve closing function. In addition, in other embodiments, the valve port 201 can also be designed as a straight hole structure, and the valve core 5 can abut against the end wall of the valve port 201 to achieve the same valve closing effect.

[0063] The valve sleeve 4 is connected to one end of the valve seat 2 near the valve port 201, and its inner cavity is connected to the inner cavity of the valve seat 2. The valve sleeve 4 has a liquid passage hole 401 in the circumferential direction. In this example, the valve seat 2 and the valve sleeve 4 are integrally formed. The liquid passage hole 401 is located on the circumference of the valve sleeve 4 near the valve port 201, and the number of liquid passage holes 401 is at least two. They are evenly distributed around the center of the valve sleeve 4 to achieve a uniform flow effect of fluid.

[0064] The throttling assembly includes a valve core 5 that is axially movable and disposed in the inner cavity of the valve sleeve 4. When the valve core 5 is axially moved to a state that fits against the valve port 201, the inner cavity of the valve seat 2 is isolated from the liquid passage 401. When the valve core 5 moves away from the valve port 201, the inner cavity of the valve seat 2 communicates with the liquid passage 401.

[0065] The valve sleeve 4 has an enlarged diameter section 403 formed in the inner wall of the liquid passage hole 401, so that a gap 13 is formed between the valve core 5 and the valve sleeve 4 at the position of the enlarged diameter section 403, and the medium can enter the gap 13 through the liquid passage hole 401.

[0066] In this example, the valve core 5 has a reduced diameter section 501 formed on the outer wall near the valve port 201. When the valve core 5 is closed, the reduced diameter section 501 is still in the position of the expanded diameter section 403 of the valve sleeve 4, which can further prevent the valve core 5 from contacting the burrs generated during the processing of the fluid passage 401, avoid jamming problems, and also expand the space of the gap 13, allowing more fluid to enter the gap 13, which is beneficial to improving the pressure balance around the valve core 5. The end of the valve core 5 near the valve port 201 is provided with an opening 502. The opening 502 can be designed as a single through hole or multiple evenly distributed small holes, etc., to facilitate fluid passage. The porous structure can reduce the noise when the fluid passes through, thus playing a noise reduction role.

[0067] In this example, the throttling component further includes:

[0068] The movable seat 6 is axially movable and is disposed in the inner cavity of the valve core 5. It is provided with a second flow channel 9 that is disposed through the axial direction. In this example, the second flow channel 9 is a circular hole and multiple channels are provided and evenly distributed around the center of the movable seat 6. In other embodiments, the second flow channel 9 can also be designed as a through groove structure in the circumferential direction of the movable seat 6.

[0069] Spring 3 is installed in the inner cavity of valve core 5, with one end abutting against the movable seat 6 and the other end abutting against the inner wall of valve core 5.

[0070] The fixed seat 7 is sealed to the valve core 5, and can be fixed by threaded connection, welding, spinning, etc., and has a throttling hole 702 that runs through it along its axial direction;

[0071] The valve needle 10 is mounted on the movable seat 6 and is configured to cooperate with the throttling orifice 702 to achieve a throttling effect.

[0072] In this example, the inner wall of the valve core 5 is provided with a stepped portion 503 extending towards its center. When the movable seat 6 moves along its axial direction to the first limit position, it can abut against the stepped portion 503. When the movable seat 6 moves along its axial direction to the second limit position, it can abut against the fixed seat 7. More specifically, the stepped portion 503 can be formed simultaneously during the forming process of the reduced diameter section 501. The stepped portion 503 can mechanically limit the movable seat 6, avoiding the problem of spring 3 failure due to excessive compression.

[0073] In this example, the end of the valve sleeve 4 away from the valve port 201 is provided with a limiting structure to prevent the valve core 5 from disengaging from the valve sleeve 4. Specifically, the limiting structure is a constricted portion 402 located at the end of the valve sleeve 4 and folded inward. The inner diameter of the constricted portion 402 is smaller than the outer diameter of the valve core 5. When the valve core 5 moves to its limit position away from the valve port 201, it can contact the inner wall of the constricted portion 402 to achieve the effect of axial limiting.

[0074] In this example, it also includes a valve tube 1, which is sealed to the valve seat 2. The connection is achieved through welding or spinning, and the inner cavity of the valve tube 1 communicates with the inner cavity of the valve seat 2. A first flow channel 8 is formed between the valve tube 1 and the valve sleeve 4, and the first flow channel 8 communicates with the liquid passage 401. When the valve core 5 is in the open state, as... Figure 1 As shown, the fluid flows from top to bottom, passing through the liquid passage 401 into the first flow channel 8, and then continues to flow downwards from the first flow channel 8, maintaining the unobstructed flow of fluid inside the valve; when the valve core 5 is in the closed state, as... Figure 2 As shown, the fluid flows from bottom to top, and some of the fluid can enter the gap 13 through the first flow channel 8 and the liquid passage 401, so that the valve core 5 is subjected to uniform force in the circumferential direction and avoids the valve core 5 from shaking. When the valve core 5 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 3, which can push the valve needle 10 upward. The fluid can enter the interior of the valve core 5 through the throttling hole 702 and continue to flow upward from the opening 502 above the valve core 5, which can achieve the throttling effect.

[0075] In this example, a filter screen 11 is also included. The filter screen 11 is disposed inside the valve tube 1, and there are two of them. The valve seat 2 and the valve sleeve 4 are respectively disposed between the two filter screens 11.

[0076] Example 2

[0077] like Figure 6 As shown, the difference between this embodiment and the first embodiment above is only that: the limiting structure is a limiting ring 12 installed at the end of the valve sleeve 4. The inner diameter of the limiting ring 12 is smaller than the outer diameter of the valve core 5. The valve core 5 can abut against the end of the limiting ring 12 to achieve the axial limiting effect of the valve core 5 and prevent it from detaching from the valve sleeve 4.

[0078] Example 3

[0079] like Figure 7 As shown, this embodiment is based on the above embodiment 2. One end of the outer wall of the fixed seat 7 is provided with a tapered part 701. The inner wall of the limiting ring 12 has a tapered structure that matches the tapered part 701. When the valve core 5 moves to the limit position, the tapered part 701 of the fixed seat 7 can abut against the tapered inner wall of the limiting ring 12 to achieve precise positioning and reduce collision noise.

[0080] Example 4

[0081] like Figure 8As shown, the difference between this embodiment and embodiment one is only that: one of the filter screens 11 is installed at the end of the valve seat 2, which is used to assemble the valve seat 2 and the filter screen 11 into an integral structure before installing it into the valve pipe 1.

[0082] Example 5

[0083] like Figure 9 As shown, the only difference between this embodiment and the first embodiment described above is that: there are two valve seats 2, two valve sleeves 4, and two throttling components, and the valve ports 201 of the valve seats 2 are arranged facing each other. This is to form a bidirectional throttling check valve to meet the needs of working applications requiring bidirectional throttling check.

[0084] 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 by, include: The valve seat (2) has a through cavity inside, and a valve port (201) is formed at one end of the cavity. The valve sleeve (4) is integrally connected to one end of the valve seat (2) near the valve port (201), and its inner cavity is connected to the inner cavity of the valve seat (2). The valve sleeve (4) has a liquid passage hole (401) in the circumferential direction. The throttling assembly includes a valve core (5) that is axially movable and disposed in the inner cavity of the valve sleeve (4). When the valve core (5) is axially moved to a position that fits against the valve port (201), the inner cavity of the valve seat (2) is isolated from the liquid passage (401). When the valve core (5) moves away from the valve port (201), the inner cavity of the valve seat (2) communicates with the liquid passage (401). The valve sleeve (4) has an enlarged diameter section (403) formed in the inner wall of the liquid passage hole (401) so that a gap (13) is formed between the valve core (5) and the valve sleeve (4) at the position of the enlarged diameter section (403), and the medium can enter the gap (13) through the liquid passage hole (401); The valve core (5) has a stepped portion (503) 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 (503). When the movable seat (6) moves along its axis to the second limit position, it can abut against the fixed seat (7).

2. An integrated throttling check valve according to claim 1, wherein The liquid passage (401) is located on the circumference of the valve sleeve (4) in the direction close to the valve port (201).

3. An integrated throttling check valve according to claim 1, wherein The valve core (5) has a reduced diameter section (501) formed on the outer wall near the valve port (201), and the valve core (5) has an opening (502) at the end near the valve port (201).

4. The integrated throttling check valve of claim 1, wherein, The throttling component also includes: The movable seat (6) is axially movable in the inner cavity of the valve core (5) and has a second flow passage (9) that runs through it along its axial direction. Spring (3) is installed in the inner cavity of valve core (5), with one end abutting against the movable seat (6) and the other end abutting against the inner wall of valve core (5). The fixed seat (7) is sealed to the valve core (5) and has a throttling hole (702) that runs through it along its axial direction. The valve needle (10) is mounted on the movable seat (6) and is configured to cooperate with the throttling orifice (702) to achieve a throttling effect.

5. An integrated throttling check valve according to claim 4, wherein The valve sleeve (4) is provided with a limiting structure at one end away from the valve port (201) to prevent the valve core (5) from disengaging from the valve sleeve (4).

6. An integrated throttling check valve according to claim 5, wherein, The limiting structure is a constricted portion (402) provided at the end of the valve sleeve (4) and folded inward, the inner diameter of the constricted portion (402) being smaller than the outer diameter of the valve core (5).

7. An integrated throttling check valve according to claim 6, wherein The outer wall of one end of the fixed base (7) is provided with a tapered part (701), and the inner wall of the constricted part (402) is a tapered structure that matches the tapered part (701).

8. An integrated throttling check valve according to claim 5, characterized in that, The limiting structure is a limiting ring (12) installed at the end of the valve sleeve (4), and the inner diameter of the limiting ring (12) is smaller than the outer diameter of the valve core (5).

9. An integrated throttling check valve according to claim 8, wherein, The outer wall of one end of the fixed seat (7) is provided with a tapered part (701), and the inner wall of the limiting ring (12) has a tapered structure that matches the tapered part (701).

10. An integrated throttling check valve according to claim 9, wherein, It also includes a valve tube (1), which is sealed to a valve seat (2), and the inner cavity of the valve tube (1) is connected to the inner cavity of the valve seat (2). A first flow passage (8) is formed between the valve tube (1) and the valve sleeve (4), and the first flow passage (8) is connected to the liquid passage (401).

11. An integrated throttling check valve according to claim 10, wherein, It also includes a filter screen (11), which is located inside the valve tube (1) and there are two of them. The valve seat (2) and valve sleeve (4) are respectively located between the two filter screens (11).

12. An integrated throttling check valve according to claim 11, wherein, One of the filters (11) is installed at the end of the valve seat (2).

13. An integrated throttling check valve according to claim 10, wherein, The valve seat (2), valve sleeve (4), and throttling assembly are all provided in two quantities, and the valve port (201) of the valve seat (2) is arranged facing each other.

14. An integrated throttling check valve according to any one of claims 1-13, wherein, The connection between the valve seat (2) and the valve sleeve (4) includes, but is not limited to, the following methods: The valve seat (2) and the valve sleeve (4) are integrally formed; The valve seat (2) and the valve sleeve (4) are separate structures, and the valve sleeve (4) is integrally stamped and formed, and the valve sleeve (4) is fixed on the valve seat (2).

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