A slow closing check valve

Abstract

The utility model provides a kind of slow closing check valve, including valve body, the two sides of the valve body are equipped with water inlet cavity and water outlet cavity, the valve body cavity is fixedly connected with partition, the middle part of the partition is penetrated and is equipped with through-hole, the through-hole makes water inlet cavity and water outlet cavity be communicated, buffer adjusting assembly is provided on the valve body, the inside top wall of the valve body cavity is fixedly connected with buffer cylinder, the circumferential side of the buffer cylinder is equipped with protective sleeve in water outlet cavity, the bottom of the protective sleeve is fixedly connected with the valve cover matched with through-hole. By buffer adjusting assembly, valve cover opening pressure and closing buffer force can be adjusted simultaneously, rotating adjusting rod can change the compression degree of second spring, so as to adjust the pressure required for valve cover opening;The alignment condition of adjusting orifice on piston cylinder and fixed cylinder is adjusted simultaneously, the hydraulic oil flow-out speed is changed, the adjustment of buffer force size is realized, and the working condition requirements of different medium flow rate, pressure and the like are adapted.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, specifically to a slow-closing check valve. Background Technology

[0002] A check valve is a valve whose opening and closing element is a valve disc or disc. It automatically opens and closes the valve disc based on the flow of the medium itself to prevent backflow of the medium. It is also called a non-return valve, one-way valve, backflow valve, and back pressure valve. A slow-closing check valve is based on a regular check valve with the addition of a slow-closing device, which enables the valve disc to close slowly and reduces the occurrence of water hammer. Most existing slow-closing check valves use a single buffering method. During use, the opening pressure and closing buffering force of the valve disc are fixed, which makes it inconvenient for personnel to effectively adjust the opening pressure and closing buffering force of the valve disc according to different working conditions. Utility Model Content

[0003] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a slow-closing check valve to solve the problems mentioned in the background art. This utility model has a novel structure. Through the buffer adjustment component, the valve cover opening pressure and closing buffer force can be adjusted simultaneously. Rotating the adjustment rod can change the compression degree of the second spring, thereby adjusting the pressure required for the valve cover to open. At the same time, adjusting the alignment of the throttling orifice on the piston cylinder and the fixed cylinder changes the hydraulic oil outflow speed, thereby adjusting the buffer force to adapt to different medium flow rates, pressures, and other working conditions.

[0004] To achieve the above objectives, this utility model is implemented through the following technical solution: a slow-closing check valve, comprising a valve body, wherein an inlet chamber and an outlet chamber are respectively provided on both sides of the valve body, a partition plate is fixedly connected inside the valve body cavity, the partition plate separates the inlet chamber and the outlet chamber in the vertical direction, and the outlet chamber is located above the inlet chamber, a through hole is provided through the middle of the partition plate, the through hole connects the inlet chamber and the outlet chamber, a buffer adjustment component is provided on the valve body, a buffer cylinder is fixedly connected to the top wall inside the valve body cavity, a protective sleeve located in the outlet chamber is sleeved around the periphery of the buffer cylinder, and a valve cover that matches the through hole is fixedly connected to the bottom of the protective sleeve.

[0005] Furthermore, the buffer adjustment assembly includes an adjustment cap that rotates and slides on the top plate of the valve body. The top plate of the valve body has a slot inside, and the bottom of the adjustment cap extends through the slot and is fixedly connected to a limiting ring plate that cooperates with it.

[0006] Furthermore, a first spring is provided between the bottom of the limiting ring plate and the bottom wall of the empty groove, and an adjusting rod is provided on the inner wall of the adjusting cap, extending into the valve body cavity.

[0007] Furthermore, an annular groove is formed on the inner circumference of the adjusting cap, and a limiting block located in the annular groove is fixedly connected to the top of the adjusting rod on the inner wall of the adjusting cap. A limiting groove is formed on the inner wall of the adjusting cap above and connected to the annular groove, and the limiting block slides in conjunction with the limiting groove.

[0008] Furthermore, a piston cylinder is fixedly connected to the end of the adjusting rod that extends into the buffer cylinder, and a piston rod located inside the protective sleeve is fixedly connected to the upper side of the middle part of the valve cover. A piston is fixedly connected to the end of the piston rod that extends into the buffer cylinder and is located inside the piston cylinder. The piston slides against the inner wall of the piston cylinder.

[0009] Furthermore, the bottom of the buffer cylinder is fixedly connected to two fixed rods, and displacement blocks are slidably fitted on the two fixed rods. The bottom of the piston cylinder is fixedly connected to an externally threaded cylinder that extends to the outside of the bottom of the buffer cylinder.

[0010] Furthermore, the external threaded sleeve is sleeved on the outside of the piston rod, the external threaded sleeve passes through the middle of the displacement block and is threadedly engaged with it, and a second spring is fixedly connected between the bottom of the displacement block and the upper side of the valve cover.

[0011] Furthermore, a fixed cylinder sleeved on the outside of the piston cylinder is fixedly connected between the upper and lower walls of the buffer cylinder. A throttling groove is formed between the outer wall of the fixed cylinder and the inner wall of the buffer cylinder. Multiple corresponding throttling holes are opened on the periphery of both the piston cylinder and the fixed cylinder.

[0012] The beneficial effects of this utility model are:

[0013] 1. This slow-closing check valve can simultaneously adjust the valve cover opening pressure and closing buffer force through a buffer adjustment component. Rotating the adjustment rod can change the compression degree of the second spring, thereby adjusting the pressure required for the valve cover to open; at the same time, it can adjust the alignment of the throttle orifice on the piston cylinder and the fixed cylinder, change the hydraulic oil outflow speed, and realize the adjustment of the buffer force to adapt to the working conditions of different media flow rates, pressures and other conditions.

[0014] 2. In the non-adjusting state, the limiting block of the adjusting cap of this slow-closing check valve is located in the annular groove. Rotating the adjusting cap will not drive the adjusting rod to rotate, effectively reducing the possibility of changes in the adjusting parameters due to accidental contact, and improving the stability and reliability of the valve. The protective sleeve protects the buffer cylinder and internal components, reducing the impact of the medium on the service life of the buffer assembly. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of a slow-closing check valve according to this utility model;

[0016] Figure 2This is a schematic diagram of the overall side sectional view of a slow-closing check valve according to the present invention;

[0017] Figure 3 This utility model Figure 2 -Enlarged structural diagram at point A;

[0018] Figure 4 This is a schematic diagram of the connection between the adjusting cap and the adjusting rod of this utility model;

[0019] Figure 5 This is a schematic diagram of the connection between the buffer cylinder and the valve cover of this utility model;

[0020] Figure 6 This utility model Figure 5 Enlarged structural diagram at point B;

[0021] Figure 7 This is a schematic diagram of the connection between the piston cylinder and the fixed cylinder of this utility model.

[0022] In the diagram: 1. Valve body; 2. Inlet chamber; 3. Outlet chamber; 4. Divider plate; 5. Through hole; 6. Buffer adjustment assembly; 601. Adjusting cap; 602. Empty groove; 603. Limiting ring plate; 604. First spring; 605. Adjusting rod; 606. Annular groove; 607. Limiting block; 608. Limiting groove; 609. Piston cylinder; 610. Piston rod; 611. Piston; 612. Fixed rod; 613. Displacement block; 614. External threaded cylinder; 615. Second spring; 616. Fixed cylinder; 617. Throttling groove; 618. Throttling orifice; 7. Buffer cylinder; 8. Protective sleeve; 9. Valve cover. Detailed Implementation

[0023] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0024] Please refer to Figures 1 to 7 This utility model provides a technical solution: a slow-closing check valve, including a valve body 1, with an inlet chamber 2 and an outlet chamber 3 respectively on both sides of the valve body 1. A partition plate 4 is fixedly connected inside the valve body 1, separating the inlet chamber 2 and the outlet chamber 3 in the vertical direction, with the outlet chamber 3 located above the inlet chamber 2. A through hole 5 is provided through the middle of the partition plate 4, connecting the inlet chamber 2 and the outlet chamber 3. A buffer adjustment assembly 6 is provided on the valve body 1. A buffer cylinder 7 is fixedly connected to the top wall inside the valve body 1. A protective sleeve 8 located inside the outlet chamber 3 is sleeved around the periphery of the buffer cylinder 7. A valve cover 9 that cooperates with the through hole 5 is fixedly connected to the bottom of the protective sleeve 8.

[0025] In this embodiment, the buffer adjustment assembly 6 includes an adjustment cap 601 that is rotatably and slidably fitted onto the top plate of the valve body 1. A slot 602 is formed inside the top plate of the valve body 1. The bottom of the adjustment cap 601 extends through the slot 602 and is fixedly connected to a limiting ring plate 603 that cooperates with it. A first spring 604 is provided between the bottom of the limiting ring plate 603 and the bottom wall of the slot 602. An adjustment rod 605 extends through the cavity of the valve body 1 onto the inner wall of the adjustment cap 601. An annular groove 606 is formed on the circumference of the inner wall of the adjustment cap 601. A limiting block 607 located within the annular groove 606 is fixedly connected to the top of the adjustment rod 605 on the inner wall of the adjustment cap 601. A limiting groove 608 is formed on the inner wall of the adjustment cap 601, located above and communicating with the annular groove 606. The limiting block 607 and the limiting groove 608 are slidably fitted together.

[0026] Specifically, when the adjusting cap 601 is not adjusted, the adjusting cap 601, through the force of the first spring 604, keeps the limiting ring plate 603 at the top of the empty groove 602, and the limiting block 607 of the adjusting rod 605 is located in the annular groove 606 on the inner wall of the adjusting cap 601. At this time, the adjusting cap 601 can be rotated at will without causing the adjusting rod 605 to rotate, reducing the possibility of accidentally touching the adjusting cap 601 and causing the adjusting rod 605 to rotate for adjustment. When it is necessary to adjust the adjusting rod 605 through the adjusting cap 601, the adjusting cap 601 is rotated so that its limiting groove 608 corresponds to the limiting block 607. At this time, the limiting block 607 is pressed down and slid into the limiting groove 608. The adjusting rod 605 can be rotated for adjustment by rotating the adjusting cap 601.

[0027] In this embodiment, the end of the adjusting rod 605 that penetrates into the buffer cylinder 7 is fixedly connected to a piston cylinder 609. A piston rod 610 located inside a protective sleeve 8 is fixedly connected to the upper side of the middle part of the valve cover 9. A piston 611 is fixedly connected to one end of the piston rod 610 that penetrates into the buffer cylinder 7 and is located inside the piston cylinder 609. The piston 611 is slidably fitted onto the inner wall of the piston cylinder 609. Two fixing rods 612 are fixedly connected to the bottom of the buffer cylinder 7, and displacement blocks 613 are slidably fitted onto the two fixing rods 612. A piston cylinder 609 is fixedly connected to the bottom of the piston cylinder 609 that penetrates into the buffer cylinder 7. A threaded cylinder 614 is located on the outer side of the bottom. The threaded cylinder 614 is sleeved on the outer side of the piston rod 610. The threaded cylinder 614 passes through the middle of the displacement block 613 and is threadedly engaged with it. A second spring 615 is fixedly connected between the bottom of the displacement block 613 and the upper side of the valve cover 9. A fixed cylinder 616 is fixedly connected between the upper and lower walls of the buffer cylinder 7 and is sleeved on the outer side of the piston cylinder 609. A throttling groove 617 is formed between the outer wall of the fixed cylinder 616 and the inner wall of the buffer cylinder 7. Multiple corresponding throttling holes 618 are opened on the periphery of both the piston cylinder 609 and the fixed cylinder 616.

[0028] Specifically, the rotation of the adjusting rod 605 drives the piston cylinder 609 to rotate, changing the alignment of the piston cylinder 609 with the throttle orifice 618 on the fixed cylinder 616, thereby adjusting the actual opening size of the throttle orifice 618, and thus changing the outflow speed of the hydraulic oil to adjust the magnitude of the buffer force. At the same time, the rotation of the piston cylinder 609 drives the external threaded cylinder 614 to rotate. Since the external threaded cylinder 614 is threadedly engaged with the displacement block 613, the displacement block 613 slides up and down on the fixed rod 612, changing the compression degree of the second spring 615, and thus adjusting the pressure required to open the valve cover 9.

[0029] When the device is in use, as the medium flows forward from the inlet chamber 2, the medium impacts the valve cover 9 upward through the through hole 5 in the middle of the partition plate 4, overcoming the elastic force of the second spring 615 and pushing the valve cover 9 upward. At this time, the valve opens. During the upward movement of the valve cover 9, the piston rod 610 moves upward synchronously. The piston 611 at the top of the piston rod 610 slides upward inside the piston cylinder 609. The hydraulic oil in the buffer cylinder 7 enters the throttling groove 617 between the piston cylinder 609 and the fixed cylinder 616 through the corresponding throttling holes 618 on the piston cylinder 609 and the fixed cylinder 616. Finally, the medium flows back to the area below the buffer cylinder 7, and smoothly enters the outlet chamber 3 through the through hole 5. When the medium stops flowing or reverses flow, the elastic force of the second spring 615 pushes the valve cover 9 downward to close the through hole 5. At the same time, the valve cover 9 drives the piston 611 to move downward in the piston cylinder 609 through the piston rod 610. The hydraulic oil in the buffer cylinder 7 is squeezed and flows through the throttling hole 618 and the throttling groove 617. The damping force generated, together with the elastic force of the second spring 615, causes the valve cover 9 to close slowly, achieving slow closure. To adjust the opening pressure and closing buffer force of valve cover 9, first rotate the adjusting cap 601 to align the limiting groove 608 with the limiting block 607 of the adjusting rod 605. Press the adjusting cap 601 down to allow the limiting block 607 to slide into the limiting groove 608. Rotating the adjusting cap 601 will drive the adjusting rod 605 to rotate. When the adjusting rod 605 rotates, it drives the piston cylinder 609 to rotate, changing the size of the alignment opening of the throttle orifice 618 and adjusting the hydraulic oil flow rate and buffer force. On the other hand, it connects the external threaded cylinder 614 with the displacement block 61. The threaded engagement of the 3 allows the displacement block 613 to slide on the fixed rod 612, changing the compression degree of the second spring 615 to adjust the opening pressure. After adjustment, the adjusting cap 601 is released, and the adjusting cap 601 is reset under the action of the first spring 604. The limiting block 607 returns to the annular groove 606. At this time, rotating the adjusting cap 601 will not drive the adjusting rod 605 to rotate, avoiding misoperation that may affect the adjustment parameters. Throughout the process, the protective sleeve 8 protects the buffer cylinder 7 and internal components, ensuring the stable operation of each component.

[0030] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It is obvious to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model.

[0031] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A slow-closing check valve, comprising a valve body (1), characterized in that: The valve body (1) has an inlet chamber (2) and an outlet chamber (3) on both sides. A partition plate (4) is fixedly connected inside the valve body (1). The partition plate (4) separates the inlet chamber (2) and the outlet chamber (3) in the vertical direction, and the outlet chamber (3) is located above the inlet chamber (2). A through hole (5) is opened through the middle of the partition plate (4), which connects the inlet chamber (2) and the outlet chamber (3). A buffer adjustment assembly (6) is provided on the valve body (1). A buffer cylinder (7) is fixedly connected to the top wall inside the valve body (1). A protective sleeve located inside the outlet chamber (3) is fitted around the buffer cylinder (7). 8) The bottom of the protective sleeve (8) is fixedly connected to a valve cover (9) that cooperates with the through hole (5). The buffer adjustment assembly (6) includes an adjustment cap (601) that rotates and slides on the top plate of the valve body (1). The top plate of the valve body (1) has a slot (602) inside. The bottom of the adjustment cap (601) passes through the slot (602) and is fixedly connected to a limiting ring plate (603) that cooperates with it. A first spring (604) is provided between the bottom of the limiting ring plate (603) and the bottom wall of the slot (602). An adjustment rod (605) that passes through the cavity of the valve body (1) is provided on the inner wall of the adjustment cap (601).

2. The slow-closing check valve according to claim 1, characterized in that: The inner wall of the adjusting cap (601) is provided with an annular groove (606). The adjusting rod (605) is fixedly connected to the top of the inner wall of the adjusting cap (601) with a limiting block (607) located in the annular groove (606). The inner wall of the adjusting cap (601) is provided with a limiting groove (608) located above and connected to the annular groove (606). The limiting block (607) and the limiting groove (608) are slidably engaged.

3. A slow-closing check valve according to claim 2, characterized in that: The end of the adjusting rod (605) that passes through the buffer cylinder (7) is fixedly connected to the piston cylinder (609). The upper side of the middle part of the valve cover (9) is fixedly connected to the piston rod (610) located in the protective sleeve (8). The end of the piston rod (610) that passes through the buffer cylinder (7) and is located in the piston cylinder (609) is fixedly connected to the piston (611). The piston (611) slides on the inner wall of the piston cylinder (609).

4. A slow-closing check valve according to claim 3, characterized in that: The bottom of the buffer cylinder (7) is fixedly connected to two fixed rods (612), and displacement blocks (613) are slidably fitted on the two fixed rods (612). The bottom of the piston cylinder (609) is fixedly connected to an external threaded cylinder (614) that extends to the outside of the bottom of the buffer cylinder (7).

5. A slow-closing check valve according to claim 4, characterized in that: The external threaded cylinder (614) is sleeved on the outside of the piston rod (610). The external threaded cylinder (614) passes through the middle of the displacement block (613) and is threadedly engaged with it. A second spring (615) is fixedly connected between the bottom of the displacement block (613) and the upper side of the valve cover (9).

6. A slow-closing check valve according to claim 5, characterized in that: A fixed cylinder (616) is fixedly connected between the upper and lower walls of the buffer cylinder (7) and sleeved on the outside of the piston cylinder (609). A throttling groove (617) is formed between the outer wall of the fixed cylinder (616) and the inner wall of the buffer cylinder (7). Multiple corresponding throttling holes (618) are opened on the periphery of both the piston cylinder (609) and the fixed cylinder (616).

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