Double-gate-plate gate valve

Abstract

The utility model discloses a double-gate-plate gate valve which comprises a valve body, two valve seats arranged in the valve body, two gate plates, a valve element and an elastic reset assembly. Matched guide slopes are arranged between the valve element and the gate plates, the valve element can ascend and descend relative to the gate plates, the two gate plates are opened in a guide slope matching mode, and the two gate plates are driven to move oppositely and are attached to the sealing faces of the corresponding valve seats in a sealed mode. The elastic reset assembly is connected between the two gate plates, and the two gate plates moving oppositely are driven by elastic reset force to move oppositely so as to leave the corresponding sealing faces. According to the double-gate-plate gate valve, the valve element is matched with the gate plates through the guide slopes, the stress area between the valve element and the gate plates is increased, the gate plates are driven to move horizontally through lifting of the valve element so as to be attached to the valve seat in a sealed mode, and enough pressing force is formed between the gate plates and the valve seat to guarantee sealing reliability; the horizontal movement mode of the flashboard reduces friction with the valve seat and prolongs the service life of the flashboard and the valve seat.

Description

Technical Field

[0001] The utility model relates to the technical field of valves for reactor thermal hydraulic experiments, in particular to a double-disc gate valve. Background Art

[0002] A series of reactor thermal-hydraulic experimental studies are required during reactor R&D, safety review, optimization and improvement, and reactor safety analysis software development. During reactor R&D experiments, studies of LOCA, steam generator heat transfer tube rupture, steam line rupture, and water supply pipe rupture require valves that can operate in high-temperature and high-pressure environments, have low resistance coefficients, and can open quickly.

[0003] Existing valves include gate valves that rely on stored force springs to achieve rapid closing, double-cylinder pneumatic wedge-type gate valves with manual operation, and double-disc sealed gate valves that rely on T-shaped support frames for force transmission to achieve closing. However, the above-mentioned existing valves have shortcomings such as poor valve sealing reliability and stability and short service life. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a double-disc gate valve with high sealing reliability.

[0005] The technical solution adopted by the utility model to solve the technical problem is: to provide a double-disc gate valve, comprising a valve body, two valve seats arranged opposite to each other in the valve body, two gate plates arranged in parallel between the two valve seats, a valve core arranged between the two gate plates, and an elastic reset component;

[0006] A matching guide slope is provided between the valve core and the gate plate. The valve core can be raised and lowered relative to the gate plate and the two gate plates are spread apart by the matching guide slope, so that the two gate plates move away from each other and seal against the corresponding sealing surface of the valve seat.

[0007] The elastic restoring assembly is connected between the two gate plates, and drives the two gate plates to move toward each other after moving away from each other through the elastic restoring force so as to leave the corresponding sealing surfaces.

[0008] In some embodiments, a first guiding slope is provided on the surface of each gate plate facing the other gate plate, and second guiding slopes cooperating with the first guiding slope are respectively provided on two opposite sides of the valve core.

[0009] In some embodiments, the elastic reset assembly includes two positioning sleeves, a positioning pin, and two elastic members;

[0010] The two positioning sleeves are facing each other with their openings and are fixed on the two gate plates respectively. The positioning pin is parallel to the axial direction of the positioning sleeve and is passed through the two positioning sleeves. Each elastic member is connected between one end of the positioning pin and the corresponding positioning sleeve. The extension and contraction direction of the elastic member is parallel to the moving direction of the gate plate.

[0011] In some embodiments, the double-disc gate valve includes two sets of elastic reset assemblies; the two sets of elastic reset assemblies are respectively connected between the upper ends and between the lower ends of the two gates.

[0012] In some embodiments, the double-disc gate valve further includes a valve cover and a valve stem; the valve cover is sealed on the valve body, and the valve stem passes through the valve cover into the valve body and connects to the valve core; a through hole is provided on the valve cover for the valve stem to pass through.

[0013] In some embodiments, the double-disc gate valve further includes an actuator, which is disposed on the top of the valve cover and connects to and drives the valve stem and valve core to rise and fall.

[0014] In some embodiments, the double-disc gate valve further includes a packing pressing mechanism; the packing pressing mechanism includes a packing loaded between the through hole and the valve stem, and a pressing cover plate that presses the packing and is connected to the valve cover.

[0015] In some embodiments, the interior of the valve body includes a medium channel and a cavity vertically connected to the medium channel; the valve seat is detachably embedded in the channel wall of the medium channel.

[0016] In some embodiments, a positioning step is further provided in the valve body corresponding to the gate plate. The positioning step is located on the side of the gate plate facing away from the cavity and is used to support and position the gate plate.

[0017] In some embodiments, the valve body is further provided with a sewage outlet connected to the medium channel, and a sewage valve is provided inside the sewage outlet.

[0018] The beneficial effects of the utility model are as follows: two parallel gate plates are used as closing parts, and the valve core located between the two gate plates cooperates with the gate plates through a guide slope, which increases the force-bearing area between the valve core and the gate plates, and the gate plates are driven to move horizontally by the lifting and lowering of the valve core to seal against the valve seat, and sufficient pressing force is formed between the gate plates and the valve seat to ensure sealing reliability; the horizontal movement of the gate plates reduces friction with the valve seat, thereby extending the service life of both. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0020] Figure 1This is a schematic cross-sectional view of a double-disc gate valve according to an embodiment of the present invention;

[0021] Figure 2 yes Figure 1 The schematic diagram of the structure of the valve body in the double-disc gate valve shown;

[0022] Figure 3 yes Figure 1 The figure shows the connection structure diagram of the valve core and actuator in the double-disc gate valve. DETAILED DESCRIPTION

[0023] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation methods of the present invention are now described in detail with reference to the accompanying drawings.

[0024] like Figure 1-Figure 3 As shown, a double-disc gate valve according to an embodiment of the present invention includes a valve body 10 , two valve seats 20 and two gate plates 30 disposed in the valve body 10 , a valve core 40 disposed in the valve body 10 , and an elastic reset assembly 50 .

[0025] Two valve seats 20 are spaced apart within the valve body 10. Two gates 30 are located between the two valve seats 20 and are horizontally movable, allowing them to engage with or move away from the sealing surfaces of their respective valve seats 20. A valve core 40 is located between the two gates 30 and engages with each gate 30, driving the two gates 30 to move horizontally through a lifting motion. An elastic return assembly 50 is connected between the two gates 30 and, through its elastic restoring force, forces the two gates 30, after moving away from each other, to move toward each other and away from their corresponding sealing surfaces.

[0026] Specifically, the valve body 10 is a hollow valve shell structure, internally containing a media channel 100 for the passage of media. The valve body 10 has two opposing ports communicating with the media channel 100, serving as the media inlet and outlet, respectively. Flanges 101 can be optionally provided on the media inlet and outlet to connect the entire gate valve to a pipeline. However, flanges 101 are not required when the gate valve is installed by welding.

[0027] The valve body 10 also has a third port located between the medium inlet and the medium outlet. The communication path between this port and the medium channel 100 is a cavity 110, which is vertically connected to the medium channel 100. The top of the cavity 110 is sealed by the installation of the valve cover 60.

[0028] In some embodiments, the valve body 10 is further provided with a drain port 120 connected to the medium channel 100, and a drain valve 130 is provided inside the drain port 120. The drain port 120 and the drain valve 130 can be provided depending on the use environment and whether the valve body 10 needs to drain sewage.

[0029] The two valve seats 20 are arranged at intervals relative to each other in the flow direction of the medium channel 10, and are detachably embedded in the channel wall of the medium channel 100 by fasteners (such as screws, etc.). Figure 2 In the illustrated embodiment, the valve seat 20 is located in the middle of the medium channel 100 and at a communication position between the medium channel 100 and the cavity 110 .

[0030] The detachable installation of the valve seat 20 makes inspection and maintenance more convenient. The valve seat 20 can be made of a rigid material, such as S32168 STL alloy with surfacing to increase wear resistance, or a flexible material, such as a metal C ring.

[0031] Two gate plates 30 are arranged parallel to each other between the two valve seats 20, with each gate plate 30 adjacent to one valve seat 20. In a gate valve, the two gate plates 30 can be opened and closed by moving toward or away from each other, sealing against or away from the corresponding valve seat 20. When the gate plates 30 are sealing against the valve seat 20, the media channel 100 is closed; when the gate plates 30 are away from the valve seat 20, the media channel 100 is opened.

[0032] In some embodiments, a positioning step 102 is further provided in the valve body 10 corresponding to the gate plate 30. The positioning step 102 is located on the side of the gate plate 30 facing away from the cavity 110 and is used to support and position the gate plate 30. The positioning step 102 can be integrally formed according to requirements.

[0033] The valve core 40 is located between the two gate plates 30. The two gate plates 30 have the same structure and are symmetrically located on opposite sides of the valve core 40. The valve core 40 can be raised and lowered relative to the gate plates 30, driving the two gate plates 30 to move toward or away from each other. Correspondingly, matching guide ramps are provided between the valve core 40 and the gate plates 30. The valve core 40 can be raised and lowered relative to the gate plates 30, and the guide ramps cooperate to propel the two gate plates 30 apart, driving the two gate plates 30 to move away from each other and seal against the corresponding sealing surfaces of the valve seat 20.

[0034] In an alternative embodiment, the guide slopes may include a first guide slope 31 and a second guide slope 41. Each gate plate 30 has a first guide slope 31 on its surface facing the other gate plate 30, and the valve core 40 has two opposing surfaces each having a second guide slope 41. The second guide slopes 41 on the opposing sides of the valve core 40 mate with the first guide slopes 31 on each gate plate 30.

[0035] by Figure 3Taking the example of a vertical arrangement of the gate plate 30 and valve core 40, the first and second guide slopes 31 and 41 are both inclined from bottom to top and outward. When the valve core 40 moves downward relative to the gate plate 30, the second guide slope 41 engages and moves downward along the first guide slope 31, spreading the two gate plates 30 apart and forcing them to move away from each other. When the valve core 40 moves upward relative to the gate plate 30, the second guide slope 41 engages and moves upward along the first guide slope 31, releasing the spreading action on the gate plates 30. The gate plates 30 can then move toward each other under the restoring force of the elastic return assembly 50.

[0036] Preferably, a set of guiding inclined surfaces is provided between the upper end of the valve core 40 and the gate plate 30 and between the lower end of the valve core 40 and the gate plate 30 to improve the parallelism of the relative movement of the two gate plates 30 and make the force more uniform.

[0037] refer to Figure 3 In some embodiments, the elastic return assembly 50 includes two positioning sleeves 51, a positioning pin 52, and two elastic members 53. The two positioning sleeves 51 are fixed to the two gate plates 30 with their openings facing each other. The positioning pins 52 are parallel to the axial direction of the positioning sleeves 51 and pass through the two positioning sleeves 51. Each elastic member 53 is connected between one end of the positioning pin 52 and the corresponding positioning sleeve 51. The elastic member 53 extends and contracts in a direction parallel to the movement direction of the gate plates 30. When the two gate plates 30 are forced apart by an external force and move away from each other, the positioning sleeves 51 are driven to move, thereby stretching the elastic members 53. When the external force is removed, the two gate plates 30 move toward each other under the restoring force (rebound force) of the elastic members 53.

[0038] Preferably, the double-disc gate valve includes two sets of elastic reset assemblies 50 ; the two sets of elastic reset assemblies 50 are respectively connected between the upper ends and between the lower ends of the two gates 30 .

[0039] Furthermore, the double-disc gate valve also includes a valve cover 60 and a valve stem 70. The valve cover 60 seals against the valve body 10, and the valve stem 70 passes through the valve cover 60 and enters the valve body 10, connecting to the valve core 40. When the valve stem 70 is a screw or is driven to rotate by a thread, the valve stem 70 is connected to the valve core 40 and can rotate relative to the valve core 40. The rotation of the valve stem 70 is converted into axial up and down movement, which drives the valve core 40 to rise and fall.

[0040] The valve cover 60 is connected to the valve body 10 through fasteners and seals. The valve cover 60 acts as a pressure-bearing boundary to prevent the medium in the valve body 10 from leaking out. The seal can be selected in the form of a graphite spiral wound gasket, an octagonal gasket, a flat gasket, etc. according to actual needs.

[0041] The valve cover 60 is provided with a through hole 61 for the valve stem 70 to pass through. A support ring 62 is also provided in the valve cover 60 for the valve stem 70 to pass through and to position and guide the valve stem 70. The upper and lower surfaces of the support ring 62 can be chamfered.

[0042] The double-disc gate valve further includes a packing pressing mechanism 80 disposed on the valve cover 60. The packing pressing mechanism 80 may further include a packing 81 loaded between the through hole 61 and the valve stem 70, and a pressing cover plate 82 that presses the packing 81 and is connected to the valve cover 60.

[0043] Multiple packings 81 are placed depending on the actual sealing requirements. Tightening the fasteners between the compression cover plate 82 and the valve cover 60 deforms the packing 81, ensuring a seal. To ensure the movement of the valve stem 70, the packing 81 is typically made of graphite, which ensures a good seal while also allowing for the movement of the valve stem 70.

[0044] Furthermore, the double-disc gate valve further includes an actuator 90 , which is disposed on the top of the valve cover 60 and is connected to and drives the valve stem 70 and the valve core 40 to rise and fall.

[0045] The actuator 90 can be pneumatic, electric, or manual, depending on actual needs. When using a pneumatic actuator, a buffer spring can be installed in the actuator cylinder to reduce the impact on the valve core 40 when the valve closes. Using a pneumatic actuator can meet the need for rapid valve opening and closing.

[0046] When the double-disc gate valve of the present invention is in operation, after the actuator 90 is activated, the valve stem 70 moves up and down, driving the valve core 40 and the gate plate 30 to move up and down. When the valve stem 70 moves downward, the valve core 40 and the gate plate 30 move downward accordingly. When the gate plate 30 contacts the positioning step 102, the valve core 40 continues to move downward, squeezing the two gate plates 30 horizontally through the guide slope between the valve core 40 and the gate plate 30, thereby forming sufficient pressing force between the gate plate 30 and the valve seat 20. At the same time, the elastic member 53 of the elastic reset assembly 50 is stretched under force. At the same time, the use of the guide slope between the valve core 40 and the gate plate 30 increases the force-bearing area, makes the force on the valve core 40 and the gate plate 30 more uniform, and improves the sealing reliability. The spring (530) in the positioning assembly (520) is stretched under force. When the valve stem 70 moves upward, the valve core 40 and the gate plate 30 move upward accordingly. The two parallel gates 30 move toward each other under the action of gravity and the rebound force of the elastic member 53 , and then the gates 30 move horizontally and disengage from the valve seat 20 , thereby reducing friction between the gates 30 and the valve seat 20 and extending their service life.

[0047] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A double-disc gate valve, characterized in that: It includes a valve body, two valve seats arranged in the valve body with a spacing therebetween, two gate plates arranged in parallel between the two valve seats, a valve core arranged between the two gate plates, and an elastic reset component; A matching guide slope is provided between the valve core and the gate plate. The valve core can be raised and lowered relative to the gate plate and the two gate plates are spread apart by the matching guide slope, so that the two gate plates move away from each other and seal against the corresponding sealing surface of the valve seat. The elastic restoring assembly is connected between the two gate plates, and drives the two gate plates to move toward each other after moving away from each other through the elastic restoring force so as to leave the corresponding sealing surfaces.

2. The double-disc gate valve according to claim 1, characterized in that: A first guiding inclined surface is provided on the surface of each gate plate facing the other gate plate, and second guiding inclined surfaces cooperating with the first guiding inclined surface are respectively provided on two opposite sides of the valve core.

3. The double-disc gate valve according to claim 1, characterized in that: The elastic reset assembly includes two positioning sleeves, a positioning pin and two elastic members; The two positioning sleeves are facing each other with their openings and are fixed on the two gate plates respectively. The positioning pin is parallel to the axial direction of the positioning sleeve and is passed through the two positioning sleeves. Each elastic member is connected between one end of the positioning pin and the corresponding positioning sleeve. The extension and contraction direction of the elastic member is parallel to the moving direction of the gate plate.

4. The double-disc gate valve according to claim 1, characterized in that: The double-disc gate valve comprises two groups of elastic reset assemblies; the two groups of elastic reset assemblies are respectively connected between the upper ends and the lower ends of the two gate plates.

5. The double-disc gate valve according to any one of claims 1 to 4, characterized in that: The double-disc gate valve further includes a valve cover and a valve stem; the valve cover is sealed on the valve body, and the valve stem passes through the valve cover into the valve body and is connected to the valve core; a through hole is provided on the valve cover for the valve stem to pass through.

6. The double-disc gate valve according to claim 5, characterized in that: The double-disc gate valve further includes an actuator, which is disposed on the top of the valve cover and is connected to and drives the valve stem and valve core to rise and fall.

7. The double-disc gate valve according to claim 5, characterized in that: The double-disc gate valve further includes a packing pressing mechanism; the packing pressing mechanism includes a packing filled between the through hole and the valve stem, and a pressing cover plate that presses the packing and is connected to the valve cover.

8. The double-disc gate valve according to any one of claims 1 to 4, characterized in that: The valve body includes a medium channel and a cavity vertically connected to the medium channel; the valve seat is detachably embedded in the channel wall of the medium channel.

9. The double-disc gate valve according to claim 8, characterized in that: A positioning step is further provided in the valve body corresponding to the gate plate. The positioning step is located on the side of the gate plate facing away from the cavity and is used to support and position the gate plate.

10. The double-disc gate valve according to claim 8, characterized in that: The valve body is further provided with a sewage outlet communicated with the medium channel, and a sewage valve is provided inside the sewage outlet.

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