Flat gate valve

Abstract

The invention provides a flat gate valve which comprises a gate valve body, a valve cavity is formed in the gate valve body, and valve holes communicating with the valve cavity are formed in the two sides of the gate valve body; the two gate plates are arranged in the valve cavity at intervals; the opening and closing mechanism is connected with the two flashboards; the lifting driving mechanism is connected to the top of the gate valve body, the lifting driving mechanism is connected with the opening and closing mechanism, and the two gate plates can be opened at the positions of the valve holes and block the two valve holes correspondingly when the lifting driving mechanism drives the opening and closing mechanism to descend. The two gate plates can be folded at the positions of the valve holes and are far away from the two valve holes respectively when the lifting driving mechanism drives the opening and folding mechanism to rise. Through the design of the flat gate valve, the weight of the whole machine is reduced, meanwhile, abrasion of the first sealing ring is reduced, and the service life of the first sealing ring is prolonged.

Description

Technical Field

[0001] The present invention belongs to the technical field of self-closing valves, and more specifically, relates to a flat gate valve. Background Art

[0002] The gate plate of the existing flat gate valve is provided with a guide hole, resulting in that the existing gate plate size is relatively large. In order to prevent the gate valve body from limiting the lifting and lowering of the gate plate, a accommodating cavity for accommodating the gate plate is provided at the bottom of the gate valve body, which will cause the lower volume of the gate valve body to be too large, resulting in an increase in the overall weight of the flat gate valve, thereby reducing the performance of the flat gate valve. At the same time, during the opening or closing process of the existing flat gate valve, the gate plate moves against the valve hole at one end of the valve cavity, which will cause the soft seal between the gate plate and the valve hole to be easily worn, thereby reducing the service life of the soft seal. Summary of the invention

[0003] The purpose of the present invention is to provide a flat gate valve in view of the deficiencies in the existing technology, so as to solve the problem that the gate plate of the existing flat gate valve has a guide hole and is relatively large in size, resulting in an excessively large volume of the lower part of the gate valve body, causing an increase in the weight of the entire flat gate valve and reducing the performance of the flat gate valve. At the same time, it can also solve the problem that the gate plate of the existing flat gate valve is attached to the valve hole and is located at one end of the valve cavity for movement, which easily causes wear of the soft seal and reduces the service life of the soft seal.

[0004] In order to achieve the above object, the present invention provides a flat gate valve, which includes:

[0005] A gate valve body, wherein a valve cavity is provided inside the gate valve body, and valve holes communicating with the valve cavity are provided on both sides of the gate valve body;

[0006] Two gate plates, the two gate plates are arranged in the valve cavity at intervals;

[0007] An opening and closing mechanism, wherein the opening and closing mechanism is connected to the two gate plates;

[0008] A lifting drive mechanism, wherein the lifting drive mechanism is connected to the top of the gate valve body, and the lifting drive mechanism is connected to the expanding and closing mechanism. The two gate plates can be expanded at the valve hole position and respectively block the two valve holes when the lifting drive mechanism drives the expanding and closing mechanism to descend, and the two gate plates can be closed at the valve hole position and respectively stay away from the two valve holes when the lifting drive mechanism drives the expanding and closing mechanism to rise.

[0009] Preferably, the flat gate valve further comprises:

[0010] Two valve seat rings, the two valve seat rings are respectively connected to the inner sides of the ends of the two valve holes that are close to each other;

[0011] Two first sealing rings are respectively connected to the surfaces of the two gate plates that are away from each other. When the two gate plates respectively block the two valve holes, the two first sealing rings are respectively fitted with the two valve seat rings.

[0012] Preferably, the expansion and contraction mechanism comprises:

[0013] Two driven sliders, the two driven sliders are respectively connected to the surfaces of the two gate plates close to each other, the surfaces of the two driven sliders close to each other are inclined surfaces, and the distance between the two driven sliders gradually narrows from top to bottom;

[0014] An active slider, the top of which is connected to the lifting drive mechanism, the two sides of the active slider are inclined surfaces, the distance between the two sides of the active slider gradually narrows from top to bottom, and the active slider slides between the two driven sliders;

[0015] A baffle, the baffle being connected to the bottom of the active slider, and the baffle being able to fit together with the bottom of the driven slider;

[0016] Multiple elastic members are distributed between the two gate plates, and both ends of each elastic member are respectively connected to the surfaces of the two gate plates that are close to each other. The surfaces of the two driven sliders that are close to each other can be respectively attached to the two sides of the active slider when the elastic members shrink.

[0017] Preferably, the spreading and closing mechanism further comprises two flat keys, the two flat keys are respectively connected to the two side surfaces of the active slider, and the surfaces of the two driven sliders close to each other are provided with key slots, and the two flat keys are respectively slidably connected in the two key slots.

[0018] Preferably, the expansion and contraction mechanism further comprises:

[0019] Two guide blocks, one end of each of the two guide blocks is relatively connected to the active slider, and the other end of each of the two guide blocks is provided with a guide groove;

[0020] Two guide rails are relatively connected to the inner side of the valve cavity, and the two guide grooves are respectively slidably connected to the two guide rails.

[0021] Preferably, the gate valve body comprises:

[0022] Valve body;

[0023] A valve cover is connected to the top of the valve body.

[0024] Preferably, the lifting drive mechanism comprises:

[0025] A valve stem, wherein the valve stem passes through the top of the gate valve body, and the bottom end of the valve stem is connected to the expansion and contraction mechanism;

[0026] A driving device is connected to the top of the gate valve body, and a driving end of the driving device is connected to the top of the valve stem.

[0027] Preferably, a support body is formed at the bottom of the valve cavity and below the two valve holes, and the two support bodies can respectively support the two gate plates so that the center of the gate plate can be on the axis of the valve hole and the bottom of the gate plate can slide on the support body.

[0028] Preferably, an annular groove is provided at one end of the two valve holes that are close to each other, and two valve seat rings are respectively arranged in the two annular grooves. The flat gate valve also includes two second sealing rings, and the two second sealing rings are respectively connected to the surfaces of the two valve seat rings that are away from each other, and the two second sealing rings are respectively attached to the inner sides of the two annular grooves.

[0029] Preferably, the surface of the valve seat ring is provided with an alloy layer.

[0030] The present invention provides a flat gate valve, which has the following beneficial effects: the two gate plates of the flat gate valve can be expanded at the valve hole position and respectively block the two valve holes when the lifting drive mechanism drives the expansion and contraction mechanism to descend, and the two gate plates can be contracted at the valve hole position and respectively away from the two valve holes when the lifting drive mechanism drives the expansion and contraction mechanism to rise, the flat gate valve cancels the design of the guide hole, the size of the gate plate does not need to be designed too large, and it only needs to be able to block the valve hole, and then the gate valve body no longer needs to accommodate the accommodating cavity for the gate plate to be lifted, so that the lower volume of the gate valve body can be removed, the weight of the whole machine will be greatly reduced, the energy consumption is reduced, and the performance of the flat gate valve is improved; at the same time, the flat gate valve is only in the moment of opening and closing, the gate plate and the valve hole are located at one end of the valve cavity are attached together, and in the process of opening and closing, the gate plate and the valve hole are located at one end of the valve cavity are separated, which reduces the wear of the soft seal and extends the service life of the soft seal.

[0031] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, wherein like reference numerals generally represent like components throughout the exemplary embodiments of the present invention.

[0033] Figure 1 A partial cross-sectional structural schematic diagram of a flat gate valve according to an embodiment of the present invention is shown;

[0034] Figure 2 Shows Figure 1 The enlarged structural diagram at A in the middle;

[0035] Figure 3 A schematic diagram of the three-dimensional structure of a flat gate valve according to an embodiment of the present invention is shown;

[0036] Figure 4 A schematic diagram of the three-dimensional structure of a valve body of a flat gate valve according to an embodiment of the present invention is shown;

[0037] Figure 5 A schematic diagram of a partial three-dimensional structure of a flat gate valve according to an embodiment of the present invention is shown. Figure 1 ;

[0038] Figure 6 A schematic diagram of a partial three-dimensional structure of a flat gate valve according to an embodiment of the present invention is shown. Figure 2 ;

[0039] Figure 7 A three-dimensional structural schematic diagram of an opening and closing mechanism of a flat gate valve according to an embodiment of the present invention is shown.

[0040] Description of reference numerals:

[0041] 1. Gate; 2. Valve seat ring; 3. First sealing ring; 4. Driven slider; 5. Active slider; 6. Baffle; 7. Elastic member; 8. Flat key; 9. Keyway; 10. Guide block; 11. Guide groove; 12. Guide rail; 13. Valve body; 14. Valve cover; 15. Valve stem; 16. Support body; 17. Second sealing ring. DETAILED DESCRIPTION

[0042] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0043] like Figure 1-Figure 3 As shown, the present invention provides a flat gate valve, which includes:

[0044] The gate valve body has a valve cavity inside, and valve holes communicating with the valve cavity are provided on both sides of the gate valve body;

[0045] Two gate plates 1 are arranged in the valve cavity at intervals;

[0046] An opening and closing mechanism is connected to the two gate plates 1;

[0047] The lifting drive mechanism is connected to the top of the gate valve body, and the lifting drive mechanism is connected to the expansion and contraction mechanism. The two gate plates 1 can be expanded at the valve hole position and respectively block the two valve holes when the lifting drive mechanism drives the expansion and contraction mechanism to descend. The two gate plates 1 can be contracted at the valve hole position and respectively stay away from the two valve holes when the lifting drive mechanism drives the expansion and contraction mechanism to rise.

[0048] Specifically, in order to solve the problem that the gate plate of the existing flat gate valve has a guide hole and its size is relatively large, resulting in an excessively large volume of the lower part of the gate valve body, causing an increase in the overall weight of the flat gate valve and reducing the performance of the flat gate valve, and to solve the problem that the gate plate of the existing flat gate valve is attached to the valve hole and is located at one end of the valve cavity for movement, which easily causes wear of the soft seal and reduces the service life of the soft seal, the present application provides a flat gate valve, the two gate plates 1 of the flat gate valve can be opened at the valve hole position and respectively block the two valve holes when the lifting drive mechanism drives the opening and closing mechanism to descend, and the two gate plates 1 can be opened at the valve hole position and respectively block the two valve holes when the lifting drive mechanism drives the opening and closing mechanism to rise The hole positions are closed and away from the two valve holes respectively. The flat gate valve cancels the guide hole design. The size of the gate plate 1 does not need to be designed too large, and it only needs to be able to block the valve hole. Therefore, the gate valve body no longer needs to accommodate the accommodating cavity for the lifting of the gate plate 1, so that the lower volume of the gate valve body can be removed, the weight of the whole machine will be greatly reduced, the energy consumption is reduced, and the performance of the flat gate valve is improved; at the same time, the flat gate valve is only in the moment of opening and closing, the gate plate 1 and the valve hole are located at one end of the valve cavity are attached together, during the opening and closing process, the gate plate 1 and the valve hole are located at one end of the valve cavity are separated, which reduces the wear of the soft seal and extends the service life of the soft seal.

[0049] Preferably, the flat gate valve further comprises:

[0050] Two valve seat rings 2, the two valve seat rings 2 are respectively connected to the inner sides of the ends of the two valve holes that are close to each other;

[0051] The two first sealing rings 3 are respectively connected to the surfaces of the two gate plates 1 that are away from each other. When the two gate plates 1 respectively block the two valve holes, the two first sealing rings 3 are respectively fitted with the two valve seat rings 2.

[0052] Specifically, the first sealing ring 3 is a soft sealing RPTFE. When the flat gate valve is in the closing process, the first sealing ring 3 on the gate plate 1 first contacts with the corresponding valve seat ring 2, thereby improving the sealing performance. The first sealing ring 3 is installed on the gate plate 1 to reduce the direct erosion of the medium on the first sealing ring 3 when the flat gate valve is fully opened, reduce the damage to the first sealing ring 3, and extend the sealing performance of the flat gate valve.

[0053] like Figure 5-Figure 7 As shown, preferably, the expansion and contraction mechanism includes:

[0054] Two driven sliders 4, the two driven sliders 4 are respectively connected to the surfaces of the two gate plates 1 close to each other, the surfaces of the two driven sliders 4 close to each other are inclined surfaces, and the distance between the two driven sliders 4 gradually narrows from top to bottom;

[0055] An active slider 5, the top of which is connected to the lifting drive mechanism, both sides of the active slider 5 are inclined surfaces, the distance between the two sides of the active slider 5 gradually narrows from top to bottom, and the active slider 5 slides between the two driven sliders 4;

[0056] The baffle plate 6 is connected to the bottom of the active slider 5, and the baffle plate 6 can be fitted together with the bottom of the driven slider 4;

[0057] Multiple elastic members 7 are distributed between the two gate plates 1, and both ends of each elastic member 7 are respectively connected to the surfaces of the two gate plates 1 that are close to each other. The surfaces of the two driven sliders 4 that are close to each other can be respectively attached to the two sides of the active slider 5 when the elastic members 7 are contracted.

[0058] Specifically, when the flat gate valve is in the closing process, the lifting drive mechanism drives the expansion and contraction mechanism to move downward. When the bottom of the gate plate 1 contacts the bottom of the valve cavity, the active slider 5 moves downward. Since the distance between the two driven sliders 4 gradually narrows from top to bottom, the distance between the two sides of the active slider 5 gradually narrows from top to bottom. Therefore, the active slider 5 can expand the two driven sliders 4. At this time, the two gate plates 1 move away from each other and respectively block the two valve holes to achieve the closing of the flat gate valve.

[0059] When the flat gate valve is in the opening process, the lifting drive mechanism drives the expansion and contraction mechanism to move upward. At this time, the active slider 5 moves upward first. Under the retraction of multiple elastic members 7 and the guiding action of the inclined surface, the two gate plates 1 can ensure the minimum spacing and respectively break away from the contact with the two valve seat rings 2. At this time, the two gate plates 1 move toward each other and open the two valve holes respectively to realize the opening of the flat gate valve. Then the lifting drive mechanism continues to drive the active slider 5 to move upward. At this time, the baffle 6 can support the two driven sliders 4, and the entire expansion and contraction mechanism will be moved above the valve hole to realize the full opening of the flat gate valve.

[0060] When the lifting drive mechanism of the flat gate valve is implemented in conjunction with the expansion and contraction mechanism, it can ensure that the gate plate 1 and the valve seat ring 2 are attached together only at the moment of opening and closing of the flat gate valve. During the opening and closing process, the gate plate 1 and the valve seat ring 2 are separated, which not only reduces the wear of the first sealing ring 3, but also extends the service life of the first sealing ring 3.

[0061] Preferably, the spreading and closing mechanism further comprises two flat keys 8, which are respectively connected to the two side surfaces of the active slider 5, and the surfaces of the two driven sliders 4 close to each other are provided with key slots 9, and the two flat keys 8 are respectively slidably connected in the two key slots 9.

[0062] Specifically, the slider 4 slides in the key slot 9 to guide the lifting and lowering of the active slider 5 .

[0063] Preferably, the expansion and contraction mechanism further comprises:

[0064] Two guide blocks 10, one end of each of the two guide blocks 10 is relatively connected to the active slider 5, and the other end of each of the two guide blocks 10 is provided with a guide groove 11;

[0065] Two guide rails 12 are relatively connected to the inner side of the valve cavity, and two guide grooves 11 are slidably connected to the two guide rails 12 respectively.

[0066] Specifically, the guide block 10 slides on the guide rail 12 to guide the lifting and lowering of the spreading and retracting mechanism.

[0067] Preferably, the gate valve body comprises:

[0068] Valve body 13;

[0069] The valve cover 14 is connected to the top of the valve body 13 .

[0070] Specifically, the valve body 13 and the valve cover 14 form a valve cavity.

[0071] Preferably, the lifting drive mechanism comprises:

[0072] A valve stem 15, the valve stem 15 passes through the top of the gate valve body, and the bottom end of the valve stem 15 is connected to the expansion and contraction mechanism;

[0073] A driving device is connected to the top of the gate valve body, and a driving end of the driving device is connected to the top of the valve stem 15.

[0074] Specifically, the driving device is used to drive the valve stem 15 to drive the expansion and contraction mechanism to perform lifting and lowering movements.

[0075] like Figure 4 As shown, preferably, a support body 16 is formed at the bottom of the valve cavity and below the two valve holes. The two support bodies 16 can respectively support the two gate plates 1 so that the center of the gate plate 1 can be on the axis of the valve hole and the bottom of the gate plate 1 can slide on the support body 15.

[0076] Specifically, the height of the support body 16 is designed according to the height of the valve hole, so as to support the gate plate 1 so that the gate plate 1 can accurately block the valve hole.

[0077] Preferably, an annular groove is provided at one end of the two valve holes close to each other, and the two valve seat rings 2 are respectively arranged in the two annular grooves. The flat gate valve also includes two second sealing rings 17, and the two second sealing rings 17 are respectively connected to the surfaces of the two valve seat rings 2 away from each other, and the two second sealing rings 17 are respectively fitted on the inner sides of the two annular grooves.

[0078] Specifically, the second sealing ring 17 is an O-type sealing ring, which realizes the sealing between the valve seat ring 2 and the ring groove.

[0079] Preferably, the surface of the valve seat ring 2 is provided with an alloy layer.

[0080] Specifically, the alloy layer is an STL alloy layer, and the alloy layer is welded on the surface of the valve seat 3, so that when the flat gate valve is fully opened, the alloy layer can effectively reduce the erosion of the medium on the sealing surface of the valve seat ring 2, thereby ensuring the sealing performance.

[0081] In summary, when the flat gate valve provided by the present invention is implemented, during the closing process of the flat gate valve, the lifting drive mechanism drives the expanding and contracting mechanism to move downward, and when the bottom of the gate plate 1 contacts the support body 16, due to the blocking effect of the support body 16, the active slider 5 will slide downward at this time, and since the distance between the two driven sliders 4 gradually narrows from top to bottom, the distance between the two sides of the active slider 5 gradually narrows from top to bottom, the sliding of the active slider 5 will expand the two driven sliders 4, and at this time the two gate plates 1 will slide on the two support bodies 16, and the two gate plates 1 will move away from each other until the first sealing rings 3 on the two gate plates 1 respectively contact the two valve seat rings 2, and at this time the two gate plates 1 will respectively block the two valve holes to achieve the closing of the flat gate valve.

[0082] When the flat gate valve is in the opening process, the lifting drive mechanism drives the expansion and contraction mechanism to move upward. At this time, the active slider 5 moves upward first. Under the retraction of multiple elastic members 7 and the guiding action of the inclined surface, the two driven sliders 4 will move toward each other. The two gate plates 1 can ensure the minimum spacing and respectively break away from the contact with the two valve seat rings 2. At this time, when the two gate plates 1 move toward each other, they open the two valve holes respectively to realize the opening of the flat gate valve, and then the lifting drive mechanism continues to drive the active slider 5 to move upward. At this time, the baffle 6 can support the two driven sliders 4, and the entire expansion and contraction mechanism will be moved above the valve hole to realize the full opening of the flat gate valve.

[0083] The flat gate valve cancels the guide hole design, the size of the gate plate 1 does not need to be designed to be too large, it only needs to be able to block the valve hole, and then the gate valve body no longer needs to accommodate the accommodating cavity for the gate plate 1 to be raised and lowered, so that the lower volume of the gate valve body can be removed, the weight of the whole machine will be greatly reduced, the energy consumption is reduced, and the performance of the flat gate valve is improved; at the same time, the flat gate valve is only in the moment of opening and closing, the gate plate 1 and the valve hole are located at one end of the valve cavity are attached together, during the opening and closing process, the gate plate 1 and the valve hole are located at one end of the valve cavity are separated, which reduces the wear of the first seal and extends the service life of the first seal.

[0084] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A flat gate valve, characterized in that: The flat gate valve includes: A gate valve body, wherein a valve cavity is provided inside the gate valve body, and valve holes communicating with the valve cavity are provided on both sides of the gate valve body; Two gate plates, the two gate plates are arranged in the valve cavity at intervals; An opening and closing mechanism, wherein the opening and closing mechanism is connected to the two gate plates; A lifting drive mechanism, wherein the lifting drive mechanism is connected to the top of the gate valve body, and the lifting drive mechanism is connected to the expanding and closing mechanism. The two gate plates can be expanded at the valve hole position and respectively block the two valve holes when the lifting drive mechanism drives the expanding and closing mechanism to descend, and the two gate plates can be closed at the valve hole position and respectively stay away from the two valve holes when the lifting drive mechanism drives the expanding and closing mechanism to rise.

2. A flat gate valve according to claim 1, characterized in that: The flat gate valve also includes: Two valve seat rings, the two valve seat rings are respectively connected to the inner sides of the ends of the two valve holes that are close to each other; Two first sealing rings are respectively connected to the surfaces of the two gate plates that are away from each other. When the two gate plates respectively block the two valve holes, the two first sealing rings are respectively fitted with the two valve seat rings.

3. A flat gate valve according to claim 1, characterized in that: The expansion and contraction mechanism comprises: Two driven sliders, the two driven sliders are respectively connected to the surfaces of the two gate plates close to each other, the surfaces of the two driven sliders close to each other are inclined surfaces, and the distance between the two driven sliders gradually narrows from top to bottom; An active slider, the top of which is connected to the lifting drive mechanism, the two sides of the active slider are inclined surfaces, the distance between the two sides of the active slider gradually narrows from top to bottom, and the active slider slides between the two driven sliders; A baffle, the baffle being connected to the bottom of the active slider, and the baffle being able to fit together with the bottom of the driven slider; Multiple elastic members are distributed between the two gate plates, and both ends of each elastic member are respectively connected to the surfaces of the two gate plates that are close to each other. The surfaces of the two driven sliders that are close to each other can be respectively attached to the two sides of the active slider when the elastic members shrink.

4. A flat gate valve according to claim 3, characterized in that: The spreading and closing mechanism also includes two flat keys, which are respectively connected to the two side surfaces of the active slider, and the surfaces of the two driven sliders close to each other are provided with key slots, and the two flat keys are respectively slidably connected in the two key slots.

5. A flat gate valve according to claim 3, characterized in that: The expansion and contraction mechanism also includes: Two guide blocks, one end of each of the two guide blocks is relatively connected to the active slider, and the other end of each of the two guide blocks is provided with a guide groove; Two guide rails are relatively connected to the inner side of the valve cavity, and the two guide grooves are respectively slidably connected to the two guide rails.

6. A flat gate valve according to claim 1, characterized in that: The gate valve body comprises: Valve body; A valve cover is connected to the top of the valve body.

7. A flat gate valve according to claim 1, characterized in that: The lifting drive mechanism comprises: A valve stem, wherein the valve stem passes through the top of the gate valve body, and the bottom end of the valve stem is connected to the expansion and contraction mechanism; A driving device is connected to the top of the gate valve body, and a driving end of the driving device is connected to the top of the valve stem.

8. A flat gate valve according to claim 1, characterized in that: A support body is formed at the bottom of the valve cavity and below the two valve holes. The two support bodies can respectively support the two gate plates so that the center of the gate plate can be on the axis of the valve hole and the bottom of the gate plate can slide on the support body.

9. A flat gate valve according to claim 2, characterized in that: An annular groove is provided at one end of the two valve holes that are close to each other, and two valve seat rings are respectively arranged in the two annular grooves. The flat gate valve also includes two second sealing rings, and the two second sealing rings are respectively connected to the surfaces of the two valve seat rings that are away from each other, and the two second sealing rings are respectively attached to the inner sides of the two annular grooves.

10. A flat gate valve according to claim 2, characterized in that: The surface of the valve seat ring is provided with an alloy layer.

Images