Passive quick-opening slow-closing check valve

Abstract

The passive quick-opening and slow-closing check valve 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 rotationally 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, through the designed pull rod device, the pull rod device can open the valve assembly through circulation of a medium, 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 relieved, 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 invention relates to the technical field of valves, and in particular to a passive fast-opening and slow-closing check valve. Background Art

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

[0003] The passive fast opening slow closing check valve is a special check valve that combines the characteristics of passive (i.e. not dependent on external power source) and fast opening slow closing.

[0004] The passive quick-opening and slow-closing check valve is a valve that can automatically block the backflow of the medium. Its opening and closing parts rely on the thrust of the medium flow and the weight of the valve disc to open or close, and the valve structure itself realizes a leakage-free quick-opening and slow-closing function.

[0005] In special piping systems, conventional swing check valves do not have a non-leakage slow-closing function. The check valves with this function needed in operating nuclear power plants are basically imported valves, so a non-passive quick-opening slow-closing check valve is needed. Summary of the invention

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

[0007] To achieve the above object, the technical solution adopted by the present invention is:

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

[0009] Furthermore, the lower end of the hydraulic chamber and the upper ends of the two connecting blocks are both installed with screws, and the outer ring of the upper end of the valve body and the left and right parts of the outer ring of the lower end of the valve cover are both installed with fixing bolts.

[0010] Furthermore, the lower portion of the connection block located on the left is open, and a pin is fixedly connected to the inner cavity of the connection block.

[0011] Further, the valve assembly includes a rocker arm, which is rotatably connected to the outer surface of the pin shaft, a limiting rod is fixedly connected to the right side of the upper 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 ring of the left end of the valve disc.

[0012] Furthermore, the sealing ring is fitted to the left side of the lower part of the inner cavity of the valve body.

[0013] Furthermore, the pulling rod device includes a guide sleeve, which is fixedly connected to the lower side of the inner cavity of the hydraulic chamber, and a suspension rod is slidably connected to the inner cavity of the guide sleeve, and an arc block is fixedly connected to the lower end of the suspension rod, and a spring is sleeved on the upper part of the outer surface of the arc block, and a second threaded rod is fixedly connected to the middle part of the upper end of the suspension rod, and a screw sleeve is threadedly connected to the outer surface of the second threaded rod, and a hydraulic plug is slidably connected to the outer surface of the screw sleeve, and through holes are opened on the left and right sides of the middle part of the bottom wall of the hydraulic chamber.

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

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

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The device is designed with a pull rod device, which can open the valve assembly through the flow of the medium. When the medium flows back, the pull rod device will automatically close the valve assembly, thereby effectively reducing the impact of water hammer on pipelines and equipment and protecting the integrity and safety of the system. This entire process does not rely on external power sources, effectively improving the practicality of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 It is a cross-sectional view of the overall structure of the present invention;

[0020] Figure 3 It is a plan view of the overall structure of the present invention;

[0021] Figure 4 It is a schematic diagram of the structure of the valve assembly of the present invention;

[0022] Figure 5 It is a schematic structural diagram of the pull rod device of the present invention.

[0023] The markings in the figure are: 1. valve body; 2. connecting block; 3. fixing bolt; 4. valve cover; 5. pull rod device; 6. screw; 7. valve assembly; 8. hydraulic chamber; 71. sealing ring; 72. valve disc; 73. first threaded rod; 74. nut; 75. limit rod; 76. rocker arm; 51. arc block; 52. suspension rod; 53. guide sleeve; 54. second threaded rod; 55. screw sleeve; 56. hydraulic plug; 58. spring; 59. through hole. DETAILED DESCRIPTION

[0024] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

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

[0026] Furthermore, the lower end of the hydraulic chamber 8 and the upper ends of the two connecting blocks 2 are both installed with screws 6, and the upper outer ring of the valve body 1 and the left and right parts of the lower outer ring of the valve cover 4 are both installed with fixing bolts 3;

[0027] Furthermore, the lower portion of the connection block 2 located on the left is open, and a pin is fixedly connected to the inner cavity of the connection block 2.

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

[0029] In the above device, before the device is implemented, the valve assembly 7 is first installed on the connecting block 2 located on the left, and then the hydraulic chamber 8 is placed in the valve body 1 and pressed on the two connecting blocks 2, and the hydraulic chamber 8 and the connecting block 2 are connected by screws 6. After the connection, the pull rod device 5 is placed in the middle of the inner cavity of the hydraulic chamber 8, and its lower part is connected to the upper part of the valve assembly 7, and then the valve cover 4 is covered on the hydraulic chamber 8 in turn, and finally the fixing bolt 3 is fixed to the outer ring of the upper end of the valve body 1 by the fixing bolt 3, and the installation of the device is completed.

[0030] In the above device, the left and rear ends 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 chamber 8, pushing 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 with the pin shaft connected to the left connecting block 2, so that the medium flows out from the left part of the valve body 1. When the medium flows back, the pressure of the circulating medium will become smaller. At this time, the piston effect formed by the hydraulic chamber 8 and the pull rod device 5 will cause the pull rod device 5 to move slowly downward, so that the pull rod device 5 pushes the valve assembly 7 to rotate downward, closing the circulation of the medium through the valve body 1, thereby ensuring the safety of the nuclear power plant.

[0031] In the above device, the valve cover 4 is mainly used to prevent the medium from leaking out and ensure the sealing of the device.

[0032] Further, in order to achieve the purpose of allowing the medium to flow in the valve body 1 when the valve assembly 7 is swung, refer to Figure 4 The valve assembly 7 includes a rocker arm 76, which is rotatably connected to the outer surface of the pin shaft, a limit rod 75 is fixedly connected to the right side of the upper 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 part 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, and a sealing ring 71 is fixedly connected to the outer ring of the left end of the valve disc 72;

[0033] Furthermore, the sealing ring 71 is fitted to the left side of the lower inner cavity of the valve body 1 .

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

[0035] In the above device, the limit rod 75 is connected to the pull rod device 5. When the pull rod device 5 moves upward, it will drive the limit rod 75 to move upward. When the limit rod 75 moves upward, it will drive the rocker arm 76 to rotate upward with the pin shaft installed on the connecting block 2 as the center. When the rocker arm 76 rotates upward, it will swing the valve disc 72 to allow the medium to flow.

[0036] Further, in order to achieve the purpose that when the medium enters the valve body 1, the medium flows into the inner cavity of the hydraulic chamber 8, pushes the pull rod device 5 to move upward, so that the pull rod device 5 pulls the valve assembly 7 to swing open, refer to Figure 5 The pull rod device 5 includes a guide sleeve 53, which is fixedly connected to the middle and lower side of the inner cavity of the hydraulic chamber 8. A suspension rod 52 is slidably connected to the inner cavity of the guide sleeve 53. An arc block 51 is fixedly connected to the lower end of the suspension rod 52. A spring 58 is sleeved on the upper surface of the arc block 51. A second threaded rod 54 is fixedly connected to the middle part of the upper end of the suspension rod 52. A screw 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 screw 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.

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

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

[0039] In the above 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 suspension rod 52 to move upward in the inner cavity of the guide sleeve 53. The suspension rod 52 then passes through the arc block 51, and will pull the limit rod 75 to move, so that the limit rod 75 drives the valve disc 72 to rotate upward;

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

[0041] In the above device, the spring 58 mainly serves as an auxiliary function during slow closing.

[0042] In the above device, the opening time and closing time of the valve assembly 7 can be controlled by adjusting the diameter of the hydraulic plug 56. When the hydraulic plug 56 needs to be replaced, it is only necessary to turn the knob screw sleeve 55 so that the screw sleeve 55 is threadedly connected with the second threaded rod 54, and the screw sleeve 55 will move upward to release the fixation of the hydraulic plug 56 and the guide sleeve 53 through the screw sleeve 55. Then, the hydraulic plug 56 is taken out, the diameter of the hydraulic plug 56 is replaced, and the hydraulic plug 56 is installed back on the second threaded rod 54, and the screw sleeve 55 is tightened.

[0043] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

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

2. A passive quick-opening 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 installed with screws (6), and the upper outer ring of the valve body (1) and the left and right parts of the lower outer ring of the valve cover (4) are both installed with fixing bolts (3).

3. A passive quick-opening 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 slow-closing check valve according to claim 1, characterized in that: The valve assembly (7) comprises a rocker arm (76), wherein the rocker arm (76) is rotatably connected to the outer surface of the pin shaft, a limit rod (75) is fixedly connected to the right side of the upper 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 flap (72) is fixedly connected to the left end of the first threaded rod (73), and a sealing ring (71) is fixedly connected to the outer ring of the left end of the valve flap (72).

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

6. A passive quick-opening slow-closing check valve according to claim 4, characterized in that: The pull rod device (5) includes a guide sleeve (53), the guide sleeve (53) is fixedly connected to the lower middle side of the inner cavity of the hydraulic chamber (8), the inner cavity of the guide sleeve (53) is slidably connected to a suspension rod (52), the lower end of the suspension rod (52) is fixedly connected to an arc block (51), the upper part of the outer surface of the arc block (51) is sleeved with a spring (58), the middle part of the upper end of the suspension rod (52) is fixedly connected to a second threaded rod (54), the outer surface of the second threaded rod (54) is threadedly connected to a screw sleeve (55), the outer surface of the screw sleeve (55) is slidably connected to a hydraulic plug (56), and 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 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 cavity (8).

8. A passive quick-opening 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 block (51).

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