Check valve

Abstract

The present application provides a check valve, which belongs to the field of oil production technology. The check valve includes: a valve body, a valve seat, a valve disc, a guide rod, a guide sleeve, a valve stem, a sealing valve cover and a support cylinder; the top of the valve body is connected to the bottom of the support cylinder through the sealing valve cover, the guide sleeve passes through the sealing valve cover, and the top of the guide sleeve is connected to the top of the support cylinder through the valve stem, and the bottom of the guide sleeve is connected to the valve disc through the guide rod; a vertical channel is provided on the valve seat, the liquid inlet of the valve body is connected to the liquid outlet of the valve body through the channel, and the valve disc is horizontally arranged on the channel; the support cylinder is used to provide support force for the valve stem, and the valve stem is used to drive the valve disc to move up and down through the guide sleeve, thereby controlling the valve disc to open or block the channel. When a leakage accident occurs in the main pipeline, the oil in the main pipeline can flow back to the oil well through the check valve, thereby preventing the oil in the main pipeline from flowing out only from the leakage port, reducing environmental pollution.

Description

Technical Field

[0001] The present application relates to the technical field of oil production, and in particular to a check valve. Background Art

[0002] In the process of oilfield exploitation, in order to shorten the length of the trunk pipeline, multiple oil wells will share a trunk pipeline. When a certain oil well fails to produce oil, in order to prevent the oil from other oil wells from entering the oil well through the trunk pipeline and thus affecting the maintenance of the oil well, a check valve needs to be installed at the connection between the oil well and the trunk pipeline.

[0003] In the related art, the check valve includes a valve body, a valve seat and a valve flap, the valve seat and the valve flap are arranged in the valve body, a vertical channel is arranged on the valve seat, the liquid inlet of the valve body is connected with the liquid inlet at the bottom end of the channel, and the liquid outlet of the valve body is connected with the liquid outlet at the top end of the channel; the valve flap is arranged on the liquid outlet of the channel to block the liquid outlet of the channel. When an oil well fails, since the pressure of the oil in the oil well is lower than the pressure of the oil in the main pipeline, the valve flap is tightly covered on the liquid outlet of the channel by the downward pressure of the oil, thereby preventing the oil in the main pipeline from flowing back into the oil well.

[0004] However, when a leakage accident occurs in the main pipeline, the check valve prevents the oil in the main pipeline from flowing back into the oil well, so the oil in the main pipeline can only flow out from the leakage port, thereby causing environmental pollution. Summary of the invention

[0005] The embodiment of the present application provides a check valve, which can prevent the oil in the main pipeline from flowing out from the leakage port, thereby reducing environmental pollution. The technical solution is as follows:

[0006] The present application provides a check valve, which includes: a valve body, a valve seat, a valve disc, a guide rod, a guide sleeve, a valve stem, a sealing valve cover and a support cylinder;

[0007] The top end of the valve body is connected to the bottom end of the support cylinder through the sealing valve cover;

[0008] A valve seat is provided in the valve body, and a vertical channel is provided on the valve seat, the liquid inlet of the valve body is connected with the liquid outlet of the valve body through the channel, and the valve flap is horizontally arranged on the channel;

[0009] The valve flap is connected to the bottom end of the guide sleeve through the guide rod, the guide sleeve passes through the sealing valve cover, and the top end of the guide sleeve is connected to the top end of the support tube through the valve rod;

[0010] The sealing valve cover is used to seal the gap between the guide sleeve and the sealing valve cover, the support sleeve is used to provide support force for the valve stem, and the valve stem is used to drive the valve flap to move up and down through the guide sleeve, thereby controlling the valve flap to open or block the channel.

[0011] In a possible implementation, a first groove is provided at the top end of the guide sleeve, a first internal thread is provided in the first groove, and a first external thread is provided at the bottom end of the valve stem;

[0012] When the valve stem rotates forward, the bottom end of the valve stem gradually enters the first groove through the first external thread and the first internal thread, and the top end of the valve stem is supported by the upward support force provided by the support tube, and the guide sleeve is driven to move upward by the upward support force, thereby driving the valve disc to move upward, and controlling the valve disc to open the channel;

[0013] When the valve stem rotates in the opposite direction, the bottom end of the valve stem gradually withdraws from the first groove through the first external thread and the first internal thread, and the top end of the valve stem is supported by the downward support force provided by the support tube. The guide sleeve is driven downward by the downward support force, and the valve flap is further driven downward to control the valve flap to block the channel.

[0014] In another possible implementation, a first annular boss is provided at the top end of the guide sleeve;

[0015] The first annular boss is used to limit the upward movement position of the guide sleeve.

[0016] In another possible implementation, the check valve further includes a first screw;

[0017] The side wall of the support cylinder is provided with a first pin hole, and the top end of the sealing valve cover is provided with a first threaded hole matching the first pin hole;

[0018] The first screw passes through the first pin hole and is used to connect the support cylinder and the sealing valve cover through the first threaded hole.

[0019] In another possible implementation, the support tube includes a support cavity and a support cover plate;

[0020] The top end of the support cavity is connected to the support cover plate, and the top end of the guide sleeve is connected to the top end of the support cavity through the valve stem.

[0021] In another possible implementation, a first protrusion is provided at the top of the valve stem, a second groove matching the first protrusion is provided at the top of the support cavity, and a valve stem hole is provided on the support cover plate;

[0022] The top end of the valve stem on the upper side of the first protrusion is arranged in the valve stem hole, the first protrusion is arranged in the second groove, and the upper surface of the first protrusion is in contact with the lower surface of the support cover plate, and the lower surface of the first protrusion is in contact with the bottom of the second groove;

[0023] The top end of the valve stem is connected to the support cavity through the first protrusion, the valve stem hole and the second groove.

[0024] In another possible implementation, the sealing valve cover includes a sealing cavity and a sealing packing;

[0025] A third groove is provided in the sealing cavity, the sealing packing is fixed in the third groove, the guide sleeve passes through the sealing packing, the top end of the valve body is connected to the bottom end of the support cylinder through the sealing cavity, and the sealing packing is used to seal the gap between the guide sleeve and the sealing cavity.

[0026] In another possible implementation, the check valve further includes a second screw;

[0027] A second annular boss is disposed on the top of the sealing packing, a second pin hole is disposed on the second annular boss, and a second threaded hole matching the second pin hole is disposed on the top of the sealing cavity;

[0028] The second screw passes through the second pin hole and is used to fix the sealing packing in the third groove through the second threaded hole.

[0029] In another possible implementation, a guide groove is provided at the bottom end of the guide sleeve;

[0030] A second protrusion is arranged at the top end of the guide rod, and the second protrusion is arranged in the guide groove; the guide rod and the guide sleeve are connected with the guide groove through the second protrusion.

[0031] In another possible implementation, a guide hole is provided at the top of the guide groove.

[0032] The beneficial effects of the technical solution provided by the embodiments of the present application include at least:

[0033] The present application provides a check valve capable of reverse flow. Since a guide sleeve is provided in the check valve, and the bottom end of the guide sleeve is connected to the valve disc through a guide rod, the guide sleeve can drive the valve disc to move up and down through the guide rod during the up and down movement of the guide sleeve, thereby controlling the valve disc to open or block the channel in the check valve. When a leakage accident occurs in the main pipeline, it is only necessary to control the valve disc to open the channel in the check valve, and the oil in the main pipeline can flow back to the oil well through the check valve, thereby preventing the oil in the main pipeline from flowing out from the leakage port, greatly reducing environmental pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0035] Figure 1 is a structural schematic diagram of a check valve provided according to an embodiment of the present application;

[0036] Figure 2 is a structural schematic diagram of a valve body provided according to an embodiment of the present application;

[0037] Figure 3 is a structural schematic diagram of a guide sleeve provided according to an embodiment of the present application;

[0038] Figure 4 is a schematic structural diagram of another guide sleeve provided according to an embodiment of the present application;

[0039] Figure 5 It is a schematic structural diagram of a sealing valve cover provided according to an embodiment of the present application.

[0040] Reference numerals:

[0041] 11 Valve body

[0042] 111 Inlet valve chamber

[0043] 112 Liquid outlet valve chamber

[0044] 12 Valve seat

[0045] 13 Valve disc

[0046] 14 Guide rod

[0047] 141 Second bulge

[0048] 142 Slide Rail

[0049] 15 Guide sleeve

[0050] 151 Guide groove

[0051] 152 Sliders

[0052] 153 diversion hole

[0053] 16 Valve stem

[0054] 17 Sealing bonnet

[0055] 171 Sealed cavity

[0056] 172 Sealing Packing

[0057] 18 Support tube DETAILED DESCRIPTION

[0058] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0059] Figure 1 Schematic diagram of the structure of a check valve provided in an embodiment of the present application. Figure 1 The check valve comprises: a valve body 11, a valve seat 12, a valve disc 13, a guide rod 14, a guide sleeve 15, a valve stem 16, a sealing valve cover 17 and a support cylinder 18;

[0060] The top end of the valve body 11 is connected to the bottom end of the support cylinder 18 through the sealing valve cover 17;

[0061] A valve seat 12 is provided in the valve body 11, and a vertical channel is provided on the valve seat 12. The liquid inlet of the valve body 11 is connected with the liquid outlet of the valve body 11 through the channel, and the valve flap 13 is horizontally arranged on the channel.

[0062] The valve flap 13 is connected to the bottom end of the guide sleeve 15 through the guide rod 14, the guide sleeve 15 passes through the sealing valve cover 17, and the top end of the guide sleeve 15 is connected to the top end of the support tube 18 through the valve stem 16;

[0063] The sealing valve cover 17 is used to seal the gap between the guide sleeve 15 and the sealing valve cover 17. The support cylinder 18 is used to provide support force for the valve stem 16. The valve stem 16 is used to drive the valve disc 13 to move up and down through the guide sleeve 15, thereby controlling the valve disc 13 to open or block the channel.

[0064] The present application provides a check valve capable of reverse flow. Since a guide sleeve 15 is provided in the check valve, and the bottom end of the guide sleeve 15 is connected to the valve flap 13 through a guide rod 14, during the up and down movement of the guide sleeve 15, the guide sleeve 15 can drive the valve flap 13 to move up and down through the guide rod 14, thereby controlling the valve flap 13 to open or block the channel in the check valve; when a leakage accident occurs in the main pipeline, it is only necessary to control the valve flap 13 to open the channel in the check valve, and the oil in the main pipeline can flow back to the oil well through the check valve, thereby preventing the oil in the main pipeline from flowing out from the leakage port, thereby reducing environmental pollution.

[0065] Introduction of the valve body 11: The liquid inlet of the valve body 11 is connected to the liquid outlet of the valve body 11 through the channel on the valve seat 12. The liquid inlet of the valve body 11 is used to connect to the oil well, and the liquid outlet of the valve body 11 is used to connect to the main pipeline.

[0066] In one possible implementation, see Figure 2 The valve body 11 includes an inlet valve cavity 111 and an outlet valve cavity 112; the inlet valve cavity 111 is communicated with the inlet of the valve body 11, and the outlet valve cavity 112 is communicated with the outlet of the valve body 11. The valve seat 12 is arranged between the inlet valve cavity 111 and the outlet valve cavity 112, and is used to separate the inlet valve cavity 111 and the outlet valve cavity 112; the inlet valve cavity 111 is communicated with the outlet valve cavity 112 through a channel arranged on the valve seat 12.

[0067] Optionally, the inlet valve cavity 111 is connected to the inlet at the bottom of the channel, and the outlet valve cavity 112 is connected to the outlet at the top of the channel. When the oil well is operating normally, oil flows from bottom to top through the channel, from the inlet valve cavity 111 to the outlet valve cavity 112.

[0068] In a possible implementation, the liquid inlet of the valve body 11 is provided with a first flange, and the liquid inlet of the valve body 11 is connected to the oil well through the first flange; the liquid outlet of the valve body 11 is provided with a second flange, and the liquid outlet of the valve body 11 is connected to the main pipeline through the second flange.

[0069] The shape of the valve body 11 is spherical, cylindrical, etc. The material of the valve body 11 can be metal, such as copper, iron, etc., or metal alloy, such as aluminum alloy, tungsten steel, etc. In the embodiment of the present application, the shape, size and material of the valve body 11 are not specifically limited and can be set and changed as needed.

[0070] Introduction to the valve seat 12: The valve seat 12 is disposed in the valve body 11, and a vertical channel is provided on the valve seat 12, through which the liquid inlet of the valve body 11 is communicated with the liquid outlet of the valve body 11.

[0071] The thickness of the valve seat 12 can be any value between 1 cm and 10 cm, for example, 4 cm, 5 cm, 6 cm, etc. The material of the valve seat 12 can be metal, for example, copper, iron, etc., or metal alloy, for example, aluminum alloy, tungsten steel, etc. In the embodiment of the present application, the shape, thickness and material of the valve seat 12 are not specifically limited and can be set and changed as needed.

[0072] Optional, continue to see Figure 2 The valve seat 12 is horizontally arranged in the valve body 11, one end of the valve seat 12 is connected to the upper end of the liquid inlet of the valve body 11, and the other end of the valve seat 12 is connected to the lower end of the liquid outlet of the valve body 11. Optionally, one end of the valve seat 12 and the upper end of the liquid inlet of the valve body 11 can be integrally formed or connected together by welding; the other end of the valve seat 12 and the lower end of the liquid outlet of the valve body 11 can be integrally formed or connected together by welding.

[0073] The shape of the channel can be circular, square, oval, etc. Optionally, the channel is a circular channel, and the diameter of the circular channel can be any value between 5 cm and 15 cm, for example, 5 cm, 8 cm, 10 cm, etc. In the embodiment of the present application, the shape and size of the channel are not specifically limited and can be set and changed as needed.

[0074] Introduction to the valve flap 13: The valve flap 13 is horizontally arranged on the channel, and the valve flap 13 moves up and down to control the valve flap 13 to open or block the channel.

[0075] The shape of the valve flap 13 matches the shape of the channel, and the size of the valve flap 13 is larger than the size of the channel. When the valve flap 13 moves downward to fit the channel, the valve flap 13 can block the channel. Optionally, the shape of the channel is circular, and the shape of the valve flap 13 is also circular. The thickness of the valve flap 13 can be any value between 1 cm and 10 cm, for example, 4 cm, 5 cm, 6 cm, etc. The material of the valve flap 13 can be metal, such as copper, iron, etc., or it can be a metal alloy, such as aluminum alloy, tungsten steel, etc. In the embodiment of the present application, the shape, thickness and material of the valve flap 13 are not specifically limited, and can be set and changed as needed.

[0076] Introduction of the guide rod 14: The valve disc 13 is connected to the bottom end of the guide sleeve 15 through the guide rod 14. Optionally, the top end of the guide rod 14 is connected to the bottom end of the guide sleeve 15, and the bottom end of the guide rod 14 is connected to the valve disc 13. Optionally, the bottom end of the guide rod 14 and the valve disc 13 can be integrally formed or connected by welding; the top end of the guide rod 14 and the bottom end of the guide sleeve 15 are slidably connected.

[0077] In one possible implementation, see Figure 3The bottom end of the guide sleeve 15 is provided with a guide groove 151, and the top end of the guide rod 14 is provided with a second protrusion 141, which is arranged in the guide groove 151 and can slide in the guide groove 151. The guide rod 14 and the guide sleeve 15 are connected through the second protrusion 141 and the guide groove 151.

[0078] In another possible implementation, see Figure 4 The bottom end of the guide sleeve 15 is provided with a guide groove 151, and the bottom end of the guide groove 151 is provided with a slide bar 152; the top end of the guide rod 14 is provided with a slide rail 142, and the slide bar 152 is arranged in the slide rail 142, and the slide bar 152 can slide in the slide rail 142. The guide rod 14 and the guide sleeve 15 are connected to the slide rail 142 through the slide bar 152.

[0079] In one possible implementation, see Figure 3 A guide hole 153 is provided at the top of the guide groove 151 .

[0080] In the embodiment of the present application, since a guide hole 153 is provided at the top of the guide groove 151, when the guide rod 14 enters the guide groove 151 of the guide sleeve 15, the oil in the guide groove 151 can flow out through the guide hole 153, preventing the oil from blocking the guide rod 14 from entering the guide groove 151, thereby improving the stability of the operation of the check valve.

[0081] The shape of the guide rod 14 can be cylindrical or rectangular. The length of the guide rod 14 can be any value between 3 cm and 10 cm, for example, 4 cm, 5 cm, 6 cm, etc. The material of the guide rod 14 can be metal, for example, copper, iron, etc., or metal alloy, for example, aluminum alloy, tungsten steel, etc. In the embodiment of the present application, the shape, length and material of the guide rod 14 are not specifically limited and can be set and changed as needed.

[0082] Introduction to the guide sleeve 15: The guide sleeve 15 passes through the sealing valve cover 17, and the top end of the guide sleeve 15 is connected to the top end of the support tube 18 through the valve stem 16; the valve stem 16 is used to drive the valve flap 13 to move up and down through the guide sleeve 15, thereby controlling the valve flap 13 to open or block the channel.

[0083] In one possible implementation, a first groove is provided at the top end of the guide sleeve 15, a first internal thread is provided in the first groove, and a first external thread is provided at the bottom end of the valve stem 16; the top end of the guide sleeve 15 and the bottom end of the valve stem 16 are connected through the first internal thread and the first external thread.

[0084] When the valve stem 16 rotates forward, the bottom end of the valve stem 16 gradually enters the first groove through the first external thread and the first internal thread, and the top end of the valve stem 16 is provided with an upward supporting force by the support tube 18, and the guide sleeve 15 is driven to move upward by the upward supporting force, thereby driving the valve flap 13 to move upward, and controlling the valve flap 13 to open the channel; when the valve stem 16 rotates reversely, the bottom end of the valve stem 16 gradually withdraws from the first groove through the first external thread and the first internal thread, and the top end of the valve stem 16 is provided with a downward supporting force by the support tube 18, and the guide sleeve 15 is driven to move downward by the downward supporting force, thereby driving the valve flap 13 to move downward, and controlling the valve flap 13 to block the channel.

[0085] It should be noted that the length of the guide sleeve 15 is greater than the length of the sealing valve cover 17. Optionally, the length of the guide sleeve 15 can be any value between 3 cm and 10 cm, for example, 4 cm, 5 cm, 6 cm, etc. The shape of the guide sleeve 15 can be cylindrical or rectangular. The material of the guide sleeve 15 can be metal, for example, copper, iron, etc., or metal alloy, for example, aluminum alloy, tungsten steel, etc. In the embodiment of the present application, the shape, length and material of the guide sleeve 15 are not specifically limited and can be set and changed as needed.

[0086] In a possible implementation, a first annular boss is provided at the top of the guide sleeve 15 ; the first annular boss is used to limit the upward movement position of the guide sleeve 15 .

[0087] In the embodiment of the present application, since the upward movement position of the guide sleeve 15 is limited by the first annular boss, the valve flap 13 can be prevented from colliding with the bottom end of the sealing valve cover 17 and deforming, thereby affecting the sealing effect of the valve flap 13 on the channel, thereby improving the working stability of the check valve.

[0088] Introduction of the valve stem 16: The top end of the guide sleeve 15 is connected to the top end of the support tube 18 through the valve stem 16.

[0089] In one possible implementation, a first protrusion is provided at the top end of the valve stem 16, a second groove matching the first protrusion is provided at the top end of the support tube 18, and a valve stem hole is provided on the support cover plate; the top end of the valve stem 16 on the upper side of the first protrusion is arranged in the valve stem hole, the first protrusion is arranged in the second groove, and the upper surface of the first protrusion is fitted with the lower surface of the support cover plate, and the lower surface of the first protrusion is fitted with the bottom of the second groove; the top end of the valve stem 16 and the support tube 18 are connected through the first protrusion, the valve stem hole and the second groove.

[0090] In a possible implementation, the check valve further includes a driving component, which is connected to the top end of the valve stem 16 and is used to drive the valve stem 16 to rotate.

[0091] In one possible implementation, the driving component is a hexagonal wrench, and a hexagonal groove is provided at the top of the valve stem 16, and the hexagonal wrench matches the hexagonal groove; wherein the hexagonal wrench is connected to the hexagonal groove to drive the valve stem 16 to rotate. In another possible implementation, the driving component is a motor, and a driving shaft of the motor is connected to the top of the valve stem 16 to drive the valve stem 16 to rotate.

[0092] In a possible implementation, the check valve further includes a bearing, which is disposed at the top end of the sealing valve cover 17 , and the top end of the valve stem 16 passes through the bearing and is connected to the top end of the sealing valve cover 17 via the bearing.

[0093] In the embodiment of the present application, the top end of the valve stem 16 is arranged in a bearing. When the valve stem 16 needs to be rotated, the bearing can reduce the friction resistance between the valve stem 16 and the top end of the sealing valve cover 17, thereby increasing the speed of rotating the valve stem 16, and thereby improving the efficiency of moving the valve disc 13 of the check valve.

[0094] The length of the valve stem 16 can be any value between 3 cm and 10 cm, for example, 4 cm, 5 cm, 6 cm, etc. The shape of the valve stem 16 can be cylindrical or rectangular. The material of the valve stem 16 can be metal, for example, copper, iron, etc., or metal alloy, for example, aluminum alloy, tungsten steel, etc. In the embodiment of the present application, the shape, length and material of the valve stem 16 are not specifically limited and can be set and changed as needed.

[0095] Introduction of sealing valve cover 17: In a possible implementation, see Figure 5 The sealing valve cover 17 includes a sealing cavity 171 and a sealing packing 172; a third groove is provided in the sealing cavity 171, and the sealing packing 172 is fixed in the third groove. The guide sleeve 15 passes through the sealing packing 172, and the top end of the valve body 11 is connected to the bottom end of the support cylinder 18 through the sealing cavity 171. The sealing packing 172 is used to seal the gap between the guide sleeve 15 and the sealing cavity 171.

[0096] In the embodiment of the present application, since the gap between the guide sleeve 15 and the sealing cavity 171 is sealed by the sealing packing 172, it is possible to prevent oil from overflowing the valve body 11, thereby improving the air tightness of the check valve.

[0097] In another possible implementation, the check valve also includes a second screw; a second annular boss is provided at the top of the sealing packing 172, a second pin hole is provided on the second annular boss, and a second threaded hole matching the second pin hole is provided at the top of the sealing cavity 171; the second screw passes through the second pin hole, and is used to fix the sealing packing 172 in the third groove through the second threaded hole.

[0098] The number of the second screws, the second pin holes, and the second threaded holes is the same. Optionally, the number of the second screws can be any value between 1 and 8, for example, 3, 4, 6, etc. In the embodiment of the present application, the number of the second screws, the second pin holes, and the second threaded holes is not specifically limited and can be set and changed as needed.

[0099] Introduction of the support cylinder 18: The top end of the guide sleeve 15 is connected to the top end of the support cylinder 18 through the valve stem 16. The support cylinder 18 is used to provide support force for the valve stem 16.

[0100] The height of the support tube 18 matches the length of the valve stem 16. Optionally, the height of the support tube 18 can be any value between 3 cm and 10 cm, for example, 4 cm, 5 cm, 6 cm, etc. The shape of the support tube 18 can be cylindrical or rectangular. The material of the support tube 18 can be metal, such as copper, iron, etc., or metal alloy, such as aluminum alloy, tungsten steel, etc. In the embodiment of the present application, the shape, length and material of the support tube 18 are not specifically limited and can be set and changed as needed.

[0101] In one possible implementation, the check valve also includes a first screw; a first pin hole is provided on the side wall of the support cylinder 18, and a first threaded hole matching the first pin hole is provided on the top of the sealing valve cover 17; the first screw passes through the first pin hole and is used to connect the support cylinder 18 and the sealing valve cover 17 through the first threaded hole.

[0102] In the embodiment of the present application, the support cylinder 18 and the sealing valve cover 17 are fixed together by the first screw, which facilitates the installation and disassembly of the support cylinder 18 and the sealing valve cover 17, reduces the production cost of the check valve, and improves the practicality of the check valve.

[0103] The number of the first screws, the first pin holes, and the first threaded holes is the same. Optionally, the number of the first screws can be any value between 1 and 8, for example, 3, 4, 6, etc. In the embodiment of the present application, the number of the first screws, the first pin holes, and the first threaded holes is not specifically limited and can be set and changed as needed.

[0104] In a possible implementation, the support tube 18 includes a support cavity and a support cover plate; the top end of the support cavity is connected to the support cover plate, and the top end of the guide sleeve 15 is connected to the top end of the support tube 18 through the valve stem 16 .

[0105] Optionally, a first pin hole is provided on the side wall of the support cavity, and a third pin hole is provided on the support cover plate at a position opposite to the side wall of the support cavity; a first screw passes through the first pin hole and the third pin hole, and is used to connect the support cover plate, the support cavity and the sealing valve cover 17 through the first threaded hole.

[0106] In the embodiment of the present application, the support cover plate, the support cavity and the sealing valve cover 17 are fixed together by the first screw, which facilitates the installation and disassembly of the support cover plate, the support cavity and the sealing valve cover 17, reduces the production cost of the check valve, and improves the practicality of the check valve.

[0107] The above description is only an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A check valve, characterized in that: The check valve comprises: a valve body (11), a valve seat (12), a valve flap (13), a guide rod (14), a guide sleeve (15), a valve stem (16), a sealing valve cover (17) and a support cylinder (18); The top end of the valve body (11) is connected to the bottom end of the support cylinder (18) through the sealing valve cover (17); A valve seat (12) is provided in the valve body (11), and a vertical channel is provided on the valve seat (12); a liquid inlet of the valve body (11) is connected to a liquid outlet of the valve body (11) through the channel, and the valve flap (13) is horizontally arranged on the channel; The valve flap (13) is connected to the bottom end of the guide sleeve (15) through the guide rod (14); the guide sleeve (15) passes through the sealing valve cover (17); and the top end of the guide sleeve (15) is connected to the top end of the support tube (18) through the valve rod (16); the guide sleeve (15) is in the shape of a rectangular parallelepiped; The sealing valve cover (17) is used to seal the gap between the guide sleeve (15) and the sealing valve cover (17); the support sleeve (18) is used to provide a supporting force for the valve stem (16); the valve stem (16) is used to drive the valve flap (13) to move up and down through the guide sleeve (15), thereby controlling the valve flap (13) to open or block the channel; The top end of the guide sleeve (15) is provided with a first groove, the first groove has a first internal thread, the bottom end of the valve stem (16) is provided with a first external thread, and the top end of the valve stem (16) is provided with a hexagonal groove; When the valve stem (16) rotates forward, the bottom end of the valve stem (16) gradually enters the first groove through the first external thread and the first internal thread, and the top end of the valve stem (16) is supported by the upward support force provided by the support tube (18), and the guide sleeve (15) is driven to move upward by the upward support force, thereby driving the valve flap (13) to move upward, thereby controlling the valve flap (13) to open the channel; When the valve stem (16) rotates in the reverse direction, the bottom end of the valve stem (16) gradually withdraws from the first groove through the first external thread and the first internal thread, and the top end of the valve stem (16) is supported downward by the support tube (18), and the guide sleeve (15) is driven downward by the downward support force, thereby driving the valve flap (13) to move downward, thereby controlling the valve flap (13) to block the channel; The support tube (18) comprises a support cavity and a support cover plate, the top end of the support cavity is connected to the support cover plate, and the top end of the guide sleeve (15) is connected to the top end of the support cavity through the valve stem (16), the top end of the valve stem (16) is provided with a first protrusion, the top end of the support cavity is provided with a second groove matching the first protrusion, a valve stem hole is provided on the support cover plate, the top end of the valve stem (16) on the upper side of the first protrusion is arranged in the valve stem hole, the first protrusion is arranged in the second groove, and the upper surface of the first protrusion is in contact with the lower surface of the support cover plate, and the lower surface of the first protrusion is in contact with the bottom of the second groove, and the top end of the valve stem (16) is connected to the support cavity through the first protrusion, the valve stem hole and the second groove; The bottom end of the guide sleeve (15) is provided with a guide groove (151), the bottom end of the guide groove (151) is provided with a slide rod (152), the top end of the guide rod (14) is provided with a slide rail (142), the slide rod (152) is arranged in the slide rail (142), and the slide rod (152) can slide in the slide rail (142).

2. The check valve according to claim 1, characterized in that: The top end of the guide sleeve (15) is provided with a first annular boss; The first annular boss is used to limit the upward movement position of the guide sleeve (15).

3. The check valve according to claim 1, characterized in that: The check valve further includes a first screw; A first pin hole is provided on the side wall of the support cylinder (18), and a first threaded hole matching the first pin hole is provided on the top end of the sealing valve cover (17); The first screw passes through the first pin hole and is used to connect the support cylinder (18) and the sealing valve cover (17) through the first threaded hole.

4. The check valve according to claim 1, characterized in that: The sealing valve cover (17) comprises a sealing cavity (171) and a sealing packing (172); A third groove is provided in the sealing cavity (171), the sealing packing (172) is fixed in the third groove, and the guide sleeve (15) passes through the sealing packing (172); The top end of the valve body (11) is connected to the bottom end of the support tube (18) through the sealing cavity (171), and the sealing packing (172) is used to seal the gap between the guide sleeve (15) and the sealing cavity (171).

5. The check valve according to claim 4, characterized in that: The check valve further includes a second screw; A second annular boss is provided at the top end of the sealing packing (172), a second pin hole is provided on the second annular boss, and a second threaded hole matching the second pin hole is provided at the top end of the sealing cavity (171); The second screw passes through the second pin hole and is used to fix the sealing packing (172) in the third groove through the second threaded hole.

6. The check valve according to claim 1, characterized in that: A guide hole (153) is provided at the top end of the guide groove (151).

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