Passive quick-opening slow-closing check valve

Abstract

The passive quick-opening slow-closing check valve particularly relates to the technical field of valves and comprises a valve body, connecting blocks are fixedly connected to the left side and the right side of the upper portion of an inner cavity of the valve body, a valve assembly is rotatably connected to an inner cavity of the connecting block located on the left portion, and a hydraulic cavity is slidably connected to the upper portion of the inner cavity of the valve body. A pull rod device is slidably connected to an inner cavity of the hydraulic cavity, a valve deck is slidably connected to the edge of the upper portion of an inner cavity of the valve body, the lower portion of the connecting block located on the left portion is open, and a pin shaft is fixedly connected to an inner cavity of the connecting block. According to the passive quick-opening and slow-closing check valve provided by the utility model, the pull rod device can open the valve assembly through the circulation of a medium through the designed pull rod device, and when the medium flows back, the pull rod device can automatically close the valve assembly, so that the impact of a water hammer phenomenon on a pipeline and equipment is effectively reduced, and the integrity and safety of a system are protected; the whole process does not depend on an external power source, and the practicability of the device is effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to valve technical field, especially a kind of passive quick-opening slow-closing check valve. BACKGROUND

[0002] A nuclear power plant is a facility that converts nuclear energy into electrical energy through appropriate devices.

[0003] Passive quick-opening slow-closing check valve is a special check valve that combines passive (i.e., not dependent on external power source) and quick-opening slow-closing characteristics.

[0004] Passive quick-opening slow-closing check valve is a valve that can automatically block the backflow of medium, and its opening and closing member relies on the thrust of medium flow and its own weight to open or close, and realizes the function of quick-opening slow-closing without leakage through the structure of the valve itself.

[0005] In a special pipeline system, the conventional swing check valve does not have the function of slow-closing without leakage, and the check valve with this function needed by the nuclear power plant in operation is basically imported, so a passive quick-opening slow-closing check valve is needed. CONTENT OF THE UTILITY MODEL

[0006] The main purpose of the utility model is to provide a passive quick-opening slow-closing check valve, which can effectively solve the problems mentioned above.

[0007] To achieve the above purpose, the technical scheme adopted by the utility model is as follows:

[0008] A passive quick-opening slow-closing check valve, comprising a valve body, a connecting block is fixedly connected to the upper left and right sides of the inner cavity of the valve body, a valve assembly is rotatably connected to the inner cavity of the connecting block on the left, a hydraulic chamber is slidably connected to the upper part of the inner cavity of the valve body, a pull rod device is slidably connected to the middle part of the inner cavity of the hydraulic chamber, and a valve cover is slidably connected to the edge of the upper part of the inner cavity of the valve body.

[0009] Further, screws are installed at the lower end of the hydraulic chamber and the upper end of the two connecting blocks, and fixed bolts are installed at the outer circle of the upper end of the valve body and the outer circle of the lower end of the valve cover.

[0010] Further, the lower part of the connecting block on the left is open, and a pin shaft is fixedly connected to the inner cavity of the connecting block.

[0011] Further, the valve assembly comprises a rocker arm, the rocker arm is rotatably connected to the outer surface of the pin shaft, a limit rod is fixedly connected to the upper right side of the inner cavity of the rocker arm, a first threaded rod is slidably connected to the lower right end of the rocker arm, a nut is threadedly connected to the right part of the outer surface of the first threaded rod, a valve disc is fixedly connected to the left end of the first threaded rod, and a sealing ring is fixedly connected to the outer circle of the left end of the valve disc.

[0012] Further, the sealing ring is in contact with the lower left part of the inner cavity of the valve body.

[0013] Further, the pull rod device comprises a guide sleeve fixedly connected to the lower left side of the inner cavity of the hydraulic cavity, an inner cavity of the guide sleeve is slidably connected with a suspender, a lower end of the suspender is fixedly connected with an arc block, an outer surface of the upper part of the arc block is sleeved with a spring, a second threaded rod is fixedly connected to the upper end of the suspender, a screw sleeve is threadedly connected to the outer surface of the second threaded rod, a hydraulic plug is slidably connected to the outer surface of the screw sleeve, and a through hole is formed in the middle left and right sides of the bottom wall of the hydraulic cavity.

[0014] Further, the hydraulic plug is slidably connected to the inner cavity of the hydraulic cavity.

[0015] Further, the limiting rod is movably connected to the inner cavity of the arc block.

[0016] Compared with the prior art, the utility model has the advantages of:

[0017] The pull rod device can open the valve assembly through the flow of medium, and when the medium flows back, the pull rod device can automatically close the valve assembly, so that the impact of water hammer phenomenon on the pipeline and equipment is effectively reduced, the integrity and safety of the system are protected, and the practicability of the device is effectively improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is an overall structure schematic view of the utility model;

[0019] Figure 2 It is an overall structure sectional view of the utility model;

[0020] Figure 3 It is an overall structure plan view of the utility model;

[0021] Figure 4 It is a valve assembly structure schematic view of the utility model;

[0022] Figure 5 It is a pull rod device structure schematic view of the utility model.

[0023] In the drawing, 1 is a valve body, 2 is a connecting block, 3 is a fixed bolt, 4 is a valve cover, 5 is a pull rod device, 6 is a screw, 7 is a valve assembly, 8 is a hydraulic cavity, 71 is a sealing ring, 72 is a valve flap, 73 is a first threaded rod, 74 is a nut, 75 is a limiting rod, 76 is a rocker arm, 51 is an arc block, 52 is a suspender, 53 is a guide sleeve, 54 is a second threaded rod, 55 is a screw sleeve, 56 is a hydraulic plug, 58 is a spring, and 59 is a through hole. DETAILED DESCRIPTION

[0024] In order to make the technical means, creative features, purposes and effects of the utility model easy to understand, the utility model is further described below in combination with specific embodiments.

[0025] As shown in Figure 1 , Figure 2 and Figure 3 , a passive quick-opening slow-closing check valve comprises a valve body 1, a connecting block 2 is fixedly connected to the upper left side and the upper right side of the inner cavity of the valve body 1, a valve assembly 7 is rotatably connected to the inner cavity of the connecting block 2 on the left, a hydraulic cavity 8 is slidably connected to the upper part of the inner cavity of the valve body 1, a pull rod device 5 is slidably connected to the middle part of the inner cavity of the hydraulic cavity 8, and a valve cover 4 is slidably connected to the edge of the upper part of the inner cavity of the valve body 1.

[0026] Further, the lower end of the hydraulic cavity 8 and the upper end of the two connecting blocks 2 are both provided with a screw 6, and the outer circle of the upper end of the valve body 1 and the outer circle of the lower end of the valve cover 4 are both provided with a fixing bolt 3.

[0027] Further, the lower part of the connecting block 2 on the left is in an open shape, and a pin shaft is fixedly connected to the inner cavity of the connecting block 2.

[0028] The device is mainly used in nuclear power plants, and the main function realized is that the check valve can realize the functions of passive quick closing and slow closing, the valve does not increase the function of external leakage point, and the closing time of the valve is controlled according to the requirements of the nuclear power plant site.

[0029] In the above device, before the device is implemented, the valve assembly 7 is first installed on the connecting block 2 on the left, then the hydraulic cavity 8 is put into the valve body 1 and pressed on the two connecting blocks 2, the hydraulic cavity 8 and the connecting blocks 2 are connected through the screw 6, after the connection is completed, the pull rod device 5 is placed in the middle part of the inner cavity of the hydraulic cavity 8, and the lower part thereof is connected to the upper part of the valve assembly 7, then the valve cover 4 is covered on the hydraulic cavity 8 in sequence, and finally the fixing bolt 3 is fixed on the outer circle of the upper end of the valve body 1 through the fixing bolt 3, so that the installation of the device is completed.

[0030] In the above device, the left end and the rear end of the valve body 1 are connected to the medium pipe of the nuclear power plant, the medium under normal pressure is relatively large, when the medium flows into the valve body 1, the medium will enter the valve body 1, at the same time, the medium will also flow into the hydraulic cavity 8, push the pull rod device 5 to move upward, when the pull rod device 5 moves upward, it will drive the valve assembly 7 to rotate upward on the pin shaft connected to the connecting block 2 on the left, so that the medium flows out from the left part of the valve body 1, when the medium flows back, the pressure of the flowing medium will become smaller, at this time, the piston effect formed by the hydraulic cavity 8 and the pull rod device 5 will make the pull rod device 5 slowly move downward, so that the pull rod device 5 pushes the valve assembly 7 to rotate downward and close, closes the flow of the medium through the valve body 1, and ensures the safety of the nuclear power plant.

[0031] The valve cover 4 is mainly used for preventing medium leakage and ensuring the sealing of the device.

[0032] Further, in order to realize the purpose of making the medium flow in the valve body 1 when the valve assembly 7 is rotated, referring to Figure 4 The valve assembly 7 comprises a rocker arm 76 rotatably connected to the outer surface of the pin shaft, a limiting rod 75 fixedly connected to the upper right side of the inner cavity of the rocker arm 76, a first threaded rod 73 slidably connected to the lower right end of the rocker arm 76, a nut 74 threadedly connected to the right outer surface of the first threaded rod 73, a valve flap 72 fixedly connected to the left end of the first threaded rod 73, and a sealing ring 71 fixedly connected to the outer ring of the left end of the valve flap 72.

[0033] Further, the sealing ring 71 is in close contact with the lower left side of the inner cavity of the valve body 1.

[0034] In the device, the rocker arm 76 is first installed on the pin shaft, then the valve flap 72 is put into the lower right end of the rocker arm 76 through the first threaded rod 73, and after being placed, the nut 74 is screwed onto the first threaded rod 73 to fix the valve flap 72 on the rocker arm 76, and finally the sealing ring 71 is fixed on the left end of the valve flap 72.

[0035] In the device, the limiting rod 75 is connected to the pull rod device 5, when the pull rod device 5 moves upward, it drives the limiting rod 75 to move upward, when the limiting rod 75 moves upward, it drives the rocker arm 76 to rotate upward around the pin shaft installed on the connecting block 2, when the rocker arm 76 rotates upward, it rotates the valve flap 72 to make the medium flow.

[0036] Further, in order to realize the purpose of making the medium flow into the hydraulic cavity 8 when the medium enters the valve body 1, pushing the pull rod device 5 to move upward, and making the pull rod device 5 pull the valve assembly 7 to rotate, referring to Figure 5 The pull rod device 5 comprises a guide sleeve 53 fixedly connected to the middle and lower side of the inner cavity of the hydraulic cavity 8, a hanger rod 52 slidably connected to the inner cavity of the guide sleeve 53, an arc-shaped block 51 fixedly connected to the lower end of the hanger rod 52, a spring 58 sleeved on the upper surface of the arc-shaped block 51, a second threaded rod 54 fixedly connected to the upper middle part of the hanger rod 52, a screw sleeve 55 threadedly connected to the outer surface of the second threaded rod 54, a hydraulic plug 56 slidably connected to the outer surface of the screw sleeve 55, and a through hole 59 formed in the middle left and right sides of the bottom wall of the hydraulic cavity 8.

[0037] Further, the hydraulic plug 56 is slidably connected to the inner cavity of the hydraulic cavity 8.

[0038] Further, the limiting rod 75 is movably connected to the inner cavity of the arc-shaped block 51.

[0039] In the device, when the medium enters the inner cavity of the valve body 1, it will flow into the hydraulic cavity 8 through the through hole 59, and then the medium pushes the hydraulic plug 56 to move upward in the inner cavity of the hydraulic cavity 8. When the hydraulic plug 56 moves upward, it will pull the hanger rod 52 to move upward in the inner cavity of the guide sleeve 53. The hanger rod 52 will pull the limiting rod 75 to move through the arc block 51, so that the limiting rod 75 drives the valve flap 72 to rotate upward;

[0040] In the device, when the hydraulic plug 56 moves upward, it will pull the spring 58 to generate pressure. When the medium flows back, the hydraulic plug 56 slowly moves downward through the piston effect formed by the cooperation of the hydraulic cavity 8 and the hydraulic plug 56. The hydraulic plug 56 pushes the hanger rod 52 to move downward together, so that the hanger rod 52 pushes the valve assembly 7 to rotate downward through the arc block 51, closes the flow of the medium in the valve body 1, realizes passive closing, thereby effectively reducing the impact of water hammer phenomenon on the pipeline and equipment, reducing downtime and failure, and improving the reliability and safety of the nuclear power plant.

[0041] In the device, the spring 58 mainly plays an auxiliary role in slow closing.

[0042] In the device, the diameter of the hydraulic plug 56 can be adjusted to control the opening time of the valve assembly 7 and the closing time of the valve assembly 7. When the hydraulic plug 56 needs to be replaced, the knob sleeve 55 is rotated to move the sleeve 55 upward through the threaded connection between the sleeve 55 and the second threaded rod 54, so that the sleeve 55 is released from the fixing of the hydraulic plug 56 and the guide sleeve 53 through the sleeve 55. Then the hydraulic plug 56 is taken out, the diameter of the hydraulic plug 56 is replaced, the hydraulic plug 56 is installed on the second threaded rod 54 again, and the sleeve 55 is tightened.

[0043] The basic principles and main features of the present application and the advantages of the present application are shown and described. Those skilled in the art should understand that the present application is not limited to the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A passive quick-opening and slow-closing check valve, comprising a valve body (1), characterized in that: The valve body (1) has connecting blocks (2) fixedly connected to the upper left and right sides of the inner cavity. The valve assembly (7) is rotatably connected to the inner cavity of the connecting block (2) located on the left. The upper part of the inner cavity of the valve body (1) is slidably connected to a hydraulic chamber (8). The middle part of the inner cavity of the hydraulic chamber (8) is slidably connected to a pull rod device (5). The upper edge of the inner cavity of the valve body (1) is slidably connected to a valve cover (4).

2. The passive quick-opening and slow-closing check valve according to claim 1, characterized in that: The lower end of the hydraulic chamber (8) and the upper ends of the two connecting blocks (2) are both equipped with screws (6), and the upper outer ring of the valve body (1) and the lower outer ring of the valve cover (4) are both equipped with fixing bolts (3).

3. The passive quick-opening and slow-closing check valve according to claim 1, characterized in that: The lower part of the connecting block (2) located on the left is open, and a pin is fixedly connected to the inner cavity of the connecting block (2).

4. A passive quick-opening and slow-closing check valve according to claim 1, characterized in that: The valve assembly (7) includes a rocker arm (76), which is rotatably connected to the outer surface of a pin. A limit rod (75) is fixedly connected to the upper right side of the inner cavity of the rocker arm (76). A first threaded rod (73) is slidably connected to the lower right end of the rocker arm (76). A nut (74) is threadedly connected to the right side of the outer surface of the first threaded rod (73). A valve disc (72) is fixedly connected to the left end of the first threaded rod (73). A sealing ring (71) is fixedly connected to the outer ring of the left end of the valve disc (72).

5. A passive quick-opening and slow-closing check valve according to claim 4, characterized in that: The sealing ring (71) is attached to the lower left side of the inner cavity of the valve body (1).

6. A passive quick-opening and slow-closing check valve according to claim 4, characterized in that: The pull rod device (5) includes a guide sleeve (53), which is fixedly connected to the lower side of the inner cavity of the hydraulic chamber (8). A lifting rod (52) is slidably connected to the inner cavity of the guide sleeve (53). An arc-shaped block (51) is fixedly connected to the lower end of the lifting rod (52). A spring (58) is sleeved on the upper part of the outer surface of the arc-shaped block (51). A second threaded rod (54) is fixedly connected to the middle part of the upper end of the lifting rod (52). A threaded sleeve (55) is threadedly connected to the outer surface of the second threaded rod (54). A hydraulic plug (56) is slidably connected to the outer surface of the threaded sleeve (55). Through holes (59) are opened on the left and right sides of the middle part of the bottom wall of the hydraulic chamber (8).

7. A passive quick-opening and slow-closing check valve according to claim 6, characterized in that: The hydraulic plug (56) is slidably connected to the inner cavity of the hydraulic chamber (8).

8. A passive quick-opening and slow-closing check valve according to claim 6, characterized in that: The limiting rod (75) is movably connected to the inner cavity of the arc-shaped block (51).

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