High pressure flat gate valve

Abstract

The application provides a high-pressure flat gate valve, and relates to the field of gate valves, which comprises a high-pressure flat gate valve lower shell, the top end of the high-pressure flat gate valve lower shell is a semicircular structure, a hand wheel is rotationally installed at the center of the top end of the upper shell; a rectangular structure bottom cover plate is fixed on the opening at the bottom of the high-pressure flat gate valve lower shell through a screw, two inlet and outlet pipes are symmetrically welded on the front and rear sidewalls of the high-pressure flat gate valve lower shell, and two track strips are symmetrically arranged on the left and right inner walls of the high-pressure flat gate valve lower shell; two rectangular structure sealing plates are symmetrically and slidably installed on the front and rear of the rectangular sliding frame, two L-shaped sliding rods are symmetrically welded on the upper and lower ends of the two sealing plates, and the eight L-shaped sliding rods are slidably connected with the upper and lower rods of the rectangular sliding frame, the bottom cover plate can be directly disassembled and assembled with the gate plate after being disassembled and opened, and compared with the traditional gate valve, the gate plate can be directly disassembled and assembled without disassembling the valve shell.

Description

Technical Field

[0001] This invention relates to the field of gate valve technology, and in particular to a high-pressure flat gate valve. Background Technology

[0002] The valve body of a gate valve has fluid inlet and outlet at both ends, with flanges at the inlet and outlet. The valve body contains a accommodating space containing a closing element, which consists of a valve plate sleeve and two gates. Stops are located at both ends of the accommodating space, with valve seats welded to the stops. The closing element is threaded to the valve stem, and a handwheel is threaded onto the upper part of the valve stem. Turning the handwheel causes the closing element to rise or fall with the valve stem, opening or closing the gate valve. A flat gate valve is a type of gate valve whose closing element is a sliding valve with parallel gates. The closing element can be a single gate or a double gate with a spreading mechanism.

[0003] Most existing gate valves use a single gate that slides directly onto the inlet and outlet surfaces for sealing. When the gate slides up and down to open and close, it frequently squeezes and rubs against the inlet and outlet surfaces of the valve, causing wear and unevenness on the sealing surface. This affects the sealing performance, reduces the service life of the gate, increases the frequency of gate replacement, and raises the maintenance cost of the valve. In addition, the design of the connection and positioning components between the gate and the lifting switch assembly is not optimized, requiring additional tightening and loosening of the connection and positioning components when disassembling and assembling the gate, which is troublesome, laborious, and inconvenient. Summary of the Invention

[0004] In view of this, the present invention provides a high-pressure flat gate valve to solve the problem that most gate valves use a single gate plate to directly slide and seal with the mating surface on the inlet and outlet openings. When the gate plate slides up and down to open and close, it will frequently squeeze and rub against the mating surface of the valve's inlet and outlet, causing the sealing surface of the gate plate to be worn and uneven, which affects the sealing performance, is not conducive to extending the service life of the gate plate, and increases the frequency of gate plate replacement, thus raising the maintenance cost of the valve.

[0005] This invention provides a high-pressure flat gate valve, specifically comprising: a lower shell of the high-pressure flat gate valve, the lower shell having a rectangular hollow internal structure, and the top portion of the lower shell having a semi-elliptical structure; a semi-elliptical upper shell is screwed and fixed to the top opening of the lower shell, and a handwheel is rotatably installed at the center of the top of the upper shell; a rectangular bottom cover plate is screwed and fixed to the bottom opening of the lower shell; two inlet and outlet pipes are symmetrically welded to the front and rear side walls of the lower shell; and two track strips are symmetrically protruding from the left and right inner walls of the lower shell. A rectangular sliding frame is slidably installed on two track bars; two rectangular sealing plates are slidably installed on the rectangular sliding frame in a front-to-back orientation, and two L-shaped sliding rods are symmetrically welded to the upper and lower ends of the two sealing plates. The eight L-shaped sliding rods are slidably connected to the upper and lower side rods of the rectangular sliding frame in a front-to-back orientation; two strip-shaped sliding grooves are symmetrically opened on the left and right side rods of the rectangular sliding frame, and a support short column is welded and fixed at the middle of the top of the rectangular sliding frame. A lead screw is rotatably connected to the top of the support short column, and the lead screw is screwed through and screwed into the center of the handwheel; four vertical support limit rods are symmetrically welded to the semi-elliptical part at the top of the lower shell of the high-pressure flat gate valve.

[0006] Furthermore, four top rods are symmetrically welded to the top of the bottom cover plate, and the top sections of the four top rods have a diagonal cross-section facing each other.

[0007] Furthermore, the bottom section of the supporting short column is symmetrically welded with two hexagonal positioning shafts, and two sliding plates are symmetrically mounted on the two hexagonal positioning shafts by spring push.

[0008] Furthermore, a connecting rod is rotatably connected to the top of each of the two slide plates, and a slip ring is rotatably connected to the first end of each connecting rod, with the slip ring slidingly engaging with the supporting short column.

[0009] Furthermore, the two strip grooves are slidably engaged with the two track strips, and the two sealing plates slide in opposite directions to abut against the tail openings of the two inlet and outlet pipes located inside the lower shell of the high-pressure flat gate valve.

[0010] Furthermore, a limiting stop shaft is inserted through the tail end of each of the four L-shaped slide rods on the upper front and rear sides, and a ball bearing is embedded in the left and right ends of each of the two limiting stop shafts.

[0011] Furthermore, the four balls abut against the left and right inner walls of the lower shell of the high-pressure flat gate valve, and when the rectangular sliding frame slides upward, the four balls abut against the four vertical support limit rods.

[0012] Furthermore, the two limiting stops are connected to the bottom sections of the two sliding plates through and interlocking.

[0013] Furthermore, a stress strip is welded to both sides of the two sealing plates, and the bottom sections of all four stress strips have an oblique cross-section.

[0014] Furthermore, when the two sealing plates slide close to each other, the four force-bearing strips abut against the front and rear sides of the left and right side rods of the rectangular sliding frame, and when the rectangular sliding frame slides downward, the four force-bearing strips abut against the inclined surfaces of the four top rods.

[0015] Beneficial effects:

[0016] 1. In this invention, two sealing plates can slide against each other and block the tail openings of the two inlet and outlet pipes to close the valve. The two sealing plates (similar to two gates) use an expanding and sliding method to open and close the valve. Compared with the traditional gate valve that uses a single gate to directly slide and seal the mating surface of the inlet and outlet openings, this invention avoids frequent squeezing and friction between the gate and the mating surface of the valve's inlet and outlet, which would cause the sealing surface of the gate to be worn and become uneven, affecting the sealing performance. This helps to extend the service life of the gate, reduce the frequency of gate replacement, and effectively reduce the maintenance cost of the valve.

[0017] 2. In this invention, after the bottom cover is removed, the reverse handwheel can directly push the lead screw and rectangular sliding frame downwards through the interference fit from the lower shell of the high-pressure flat gate valve. When the rectangular sliding frame is removed from the lower shell of the high-pressure flat gate valve, the two limit stops can slide down and disengage from the left and right inner walls of the lower shell of the high-pressure flat gate valve, losing their limit. This allows for direct sliding and extraction to disassemble, clean, repair, and maintain the two sealing plates. This eliminates the trouble of tightening and loosening the insertion positioning components when disassembling the gate, which helps to simplify the disassembly and assembly steps of the gate during cleaning and maintenance. It is time-saving, labor-saving, and efficient. Moreover, after the bottom cover is removed and opened, the gate can be directly disassembled and assembled, which saves the trouble of disassembling the valve body before disassembling and assembling the gate compared to traditional gate valves.

[0018] 3. In this invention, the four vertical support limiting rods, in conjunction with the left and right inner walls of the lower shell of the high-pressure flat gate valve, can block and limit the limiting shafts, ensuring that the two limiting shafts remain inserted into the four L-shaped sliding rods and the two sliding plates when sliding up and down with the rectangular sliding frame. This guarantees the insertion and positioning function of the two sealing plates. Furthermore, the ball bearings at both ends of the limiting shafts can reduce the wear between the limiting shafts and the lower shell of the high-pressure flat gate valve and the four vertical support limiting rods, which to some extent helps to extend the service life of the valve assembly. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly described below.

[0020] The accompanying drawings described below are only related to some embodiments of the invention and are not intended to limit the invention.

[0021] In the attached diagram:

[0022] Figure 1 This is a schematic diagram of the front structure of the lower shell of a high-pressure flat gate valve according to an embodiment of the present invention.

[0023] Figure 2 This is a schematic diagram of the bottom structure of the lower shell of a high-pressure flat gate valve according to an embodiment of the present invention.

[0024] Figure 3 This is a schematic diagram of the internal structure of the lower shell of a high-pressure flat gate valve according to an embodiment of the present invention.

[0025] Figure 4 This is a schematic diagram of the internal structure of the lower shell of a high-pressure flat gate valve according to an embodiment of the present invention.

[0026] Figure 5 This is a schematic diagram of the sealing plate structure according to an embodiment of the present invention.

[0027] Figure 6 This is a schematic diagram of a rectangular sliding frame structure according to an embodiment of the present invention.

[0028] Figure 7 This is a schematic diagram of the supporting short column structure according to an embodiment of the present invention.

[0029] Figure 8 This is a schematic diagram of the track bar structure according to an embodiment of the present invention.

[0030] Figure 9 This is a schematic diagram of the bottom cover structure according to an embodiment of the present invention.

[0031] Figure label:

[0032] 1. Lower shell of high-pressure flat gate valve; 101. Inlet / outlet pipe; 102. Vertical support limit rod; 103. Track bar; 2. Upper shell; 201. Handwheel; 3. Bottom cover plate; 301. Top rod; 4. Rectangular sliding frame; 401. Lead screw; 402. Support short column; 403. Hexagonal positioning shaft; 404. Slide plate; 405. Connecting rod; 406. Slip ring; 5. Sealing plate; 501. Force-bearing strip; 502. L-shaped slide bar; 503. Limit stop shaft. Detailed Implementation

[0033] To make the objectives, solutions, and advantages of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Unless otherwise stated, the terms used herein have their ordinary meanings in the art. The same reference numerals in the drawings represent the same parts.

[0034] Example: Please refer to Figures 1 to 9 As shown:

[0035] This invention provides a high-pressure flat gate valve, comprising a lower shell 1, which has a rectangular hollow structure and a semi-circular top. A semi-elliptical upper shell 2 is screwed and fixed to the top opening of the lower shell 1. A handwheel 201 is rotatably mounted at the center of the top of the upper shell 2. Rotating the handwheel 201 forwards and backwards drives a lead screw 401, a rectangular sliding frame 4, and two sealing plates 5 to slide up and down, opening and closing two inlet / outlet pipes 101. A rectangular bottom cover 3 is screwed and fixed to the bottom opening of the lower shell 1. Two inlet / outlet pipes 101 are symmetrically welded to the front and rear side walls of the lower shell 1. Two symmetrically protruding rails 103 are provided on the left and right inner walls of the lower shell 1, and a rectangular sliding frame 4 is slidably mounted on each rail 103. The rectangular sliding frame 4 slides in opposite directions. Two rectangular sealing plates 5 are installed, and two L-shaped sliding rods 502 are symmetrically welded to the upper and lower ends of the two sealing plates 5. The eight L-shaped sliding rods 502 are arranged in a front-to-back orientation and slide through the upper and lower side rods of the rectangular sliding frame 4. Two strip-shaped sliding grooves are symmetrically opened on the left and right side rods of the rectangular sliding frame 4. A support short column 402 is welded and fixed at the middle position of the top of the rectangular sliding frame 4. A screw 401 is rotatably connected to the top of the support short column 402. The screw 401 is screwed through the center of the handwheel 201. Four vertical support limit rods 102 are symmetrically welded to the semi-elliptical part at the top of the lower shell 1 of the high-pressure flat gate valve. Two hexagonal positioning shafts 403 are symmetrically welded to the bottom section of the support short column 402. Two sliding plates 404 are symmetrically mounted on the two hexagonal positioning shafts 403 by spring push. A force-bearing strip 501 is welded to the left and right sides of the two sealing plates 5. The bottom section of the four force-bearing strips 501 is obliquely cut.

[0036] The bottom cover plate 3 has four symmetrically welded top rods 301 on its top. The top sections of the four top rods 301 are obliquely cut in opposite directions. After the bottom cover plate 3 is removed, the reverse handwheel 201 can directly push the lead screw 401 and the rectangular sliding frame 4 downwards through the interference fit from the lower shell 1 of the high-pressure flat gate valve. When the rectangular sliding frame 4 is removed from the lower shell 1 of the high-pressure flat gate valve, the two limit stops 503 can slide down and disengage from the left and right inner walls of the lower shell 1 of the high-pressure flat gate valve, thus losing their limit. This allows for direct sliding and extraction to disassemble, clean, repair, and maintain the two sealing plates 5. This eliminates the trouble of tightening and loosening the plug-in positioning components when disassembling the gate, which helps to simplify the disassembly and assembly steps of the gate during cleaning and maintenance. It is time-saving, labor-saving, and efficient. Moreover, the bottom cover plate 3 can be removed and opened to directly disassemble and assemble the gate. Compared with traditional gate valves, it saves the trouble of disassembling the valve body before disassembling and assembling the gate.

[0037] Each of the two sliding plates 404 has a connecting rod 405 rotatably connected to its top end. The ends of the two connecting rods 405 are rotatably connected to a slip ring 406. The slip ring 406 slides against the supporting short column 402. The two connecting rods 405, the two limiting shafts 503, the two sliding plates 404, and the slip ring 406 together form two crank-slider mechanisms. These two mechanisms are connected to two sealing plates 5 via the two limiting shafts 503. When the two sealing plates 5 are guided by the inclined plane... When the valve is closed by the expansion and external sliding mechanism, the springs on the two hexagonal positioning shafts 403 are compressed and driven to slide toward the support column 402, and the slip ring 406 can be pushed and driven to slide upward. When the rectangular sliding frame 4 slides upward and the four force bars 501 and the four push rods 301 slide upward and separate, the springs on the two hexagonal positioning shafts 403 can rebound and push and drive the two sliding plates 404 and the two sealing plates 5 to slide inward toward the rectangular sliding frame 4 to reset and open the valve.

[0038] The two strip grooves slide in conjunction with the two track bars 103, and the two sealing plates 5 slide in opposite directions and abut against the tail openings of the two inlet and outlet pipes 101 located inside the lower shell 1 of the high-pressure flat gate valve. The two sealing plates 5 can slide in opposite directions and abut against the tail openings of the two inlet and outlet pipes 101 to close the valve. The two sealing plates 5 (similar to two gates) use an expanding and sliding form to open and close the valve. Compared with the traditional gate valve that uses a single gate to directly slide and seal the mating surface of the inlet and outlet opening, it can avoid frequent squeezing and friction between the gate and the mating surface of the valve's inlet and outlet, which would cause the sealing surface of the gate to be worn and become uneven, affecting the sealing performance. This helps to extend the service life of the gate, reduce the frequency of gate replacement, and effectively reduce the maintenance cost of the valve.

[0039] Among them, a limiting stop shaft 503 is inserted through the tail end of each of the four L-shaped slide rods 502 on the upper front and rear sides, and a ball is embedded in the left and right ends of the two limiting stop shafts 503. The ball at the left and right ends of the limiting stop shaft 503 can reduce the wear between the limiting stop shaft 503 and the lower shell 1 of the high-pressure flat gate valve and the four vertical support limiting rods 102, which helps to extend the service life of the valve assembly to a certain extent.

[0040] Among them, the four rolling balls abut against the left and right inner walls of the lower shell 1 of the high-pressure flat gate valve, and when the rectangular sliding frame 4 slides upward, the four rolling balls abut against the four vertical support limit rods 102. The four vertical support limit rods 102, together with the left and right inner walls of the lower shell 1 of the high-pressure flat gate valve, can block and limit the limit shafts 503, so that the two limit shafts 503 can still be inserted into the four L-shaped slide rods 502 and the two slide plates 404 when they slide up and down with the rectangular sliding frame 4, thus ensuring the insertion and positioning function of the two sealing plates 5.

[0041] Among them, the two limiting shafts 503 are connected to the bottom sections of the two sliding plates 404. The two limiting shafts 503 connect the two sealing plates 5 and the two sliding plates 404 together. After the two limiting shafts 503 are removed, the sealing plates 5 can be removed to clean the scale on them and perform grinding and maintenance.

[0042] When the two sealing plates 5 slide close to each other, the four force-bearing strips 501 abut against the front and rear sides of the left and right side rods of the rectangular sliding frame 4. When the rectangular sliding frame 4 slides downward, the four force-bearing strips 501 abut against the inclined surfaces of the four top rods 301. Through the abutment between the four force-bearing strips 501 and the inclined surfaces of the four top rods 301, when the rectangular sliding frame 4 is driven to slide downward, the two sealing plates 5 can indirectly use the downward driving force of the rectangular sliding frame 4 to expand and slide forward and backward to seal the two inlet and outlet pipes 101.

[0043] The specific usage and function of this embodiment: In this invention, the forward and reverse rotation of the handwheel 201 can drive the lead screw 401, the rectangular sliding frame 4, and the two sealing plates 5 to slide up and down, thereby opening and closing the two inlet and outlet pipes 101. The four force-bearing bars 501 abut against the inclined surfaces of the four push rods 301. When the rectangular sliding frame 4 is driven to slide downwards, the two sealing plates 5 can indirectly utilize the downward driving force of the rectangular sliding frame 4 to expand and slide forward and backward to seal the two inlet and outlet pipes 101. The two connecting rods 405, the two limiting stop shafts 503, the two sliding plates 404, and the slip ring 406 are connected together to form two cranks. The slider mechanism is connected to the two sealing plates 5 via two limiting shafts 503. When the two sealing plates 5 are guided outward by the inclined plane to close the valve, the two sliding plates 404 can compress the springs on the two hexagonal positioning shafts 403 and are driven to slide toward the support short column 402. The slip ring 406 can be pushed and driven upward. When the rectangular sliding frame 4 slides upward and the four force bars 501 and the four push rods 301 slide upward and separate, the springs on the two hexagonal positioning shafts 403 can rebound and push and drive the two sliding plates 404 and the two sealing plates 5 to slide inward toward the rectangular sliding frame 4 to reset and open the valve.

[0044] The four vertical support limit rods 102, together with the left and right inner walls of the lower shell 1 of the high-pressure flat gate valve, can block and limit the limit shafts 503, so that the two limit shafts 503 can still be inserted into the four L-shaped slide rods 502 and the two slide plates 404 when sliding up and down with the rectangular sliding frame 4, ensuring the insertion and positioning function of the two sealing plates 5. In addition, the ball bearings at the left and right ends of the limit shafts 503 can reduce the wear between the limit shafts 503 and the lower shell 1 of the high-pressure flat gate valve and the four vertical support limit rods 102, which helps to extend the service life of the valve assembly to a certain extent.

[0045] Two limiting shafts 503 connect the two sealing plates 5 and the two sliding plates 404 through and through. After the two limiting shafts 503 are removed, the sealing plate 5 can be removed. The reverse handwheel 201 can directly push the lead screw 401 and the rectangular sliding frame 4 downward through interference to disengage them from the lower shell 1 of the high-pressure flat gate valve. After the rectangular sliding frame 4 disengages from the lower shell 1 of the high-pressure flat gate valve, the two limiting shafts 503 can slide down and disengage from the left and right inner walls of the lower shell 1 of the high-pressure flat gate valve, losing their limiting position. The two sealing plates 5 can be directly slid out for disassembly, cleaning, repair and maintenance.

[0046] Finally, it should be noted that when describing the position of each component and the mating relationship between them, the present invention usually uses one or a pair of components as examples. However, those skilled in the art should understand that such positions, mating relationships, etc., are also applicable to other components or other pairs of components.

[0047] The above are merely exemplary embodiments of the present invention and are not intended to limit the scope of protection of the present invention, which is determined by the appended claims.

Claims

1. A high-pressure flat gate valve, characterized in that, include: The high-pressure flat gate valve lower shell (1) has a rectangular hollow structure, and the top part of the high-pressure flat gate valve lower shell (1) is a semi-elliptical structure. A semi-elliptical upper shell (2) is fixed to the top opening of the high-pressure flat gate valve lower shell (1) by screws. A handwheel (201) is rotatably installed at the center of the top of the upper shell (2). A rectangular bottom cover plate (3) is fixed to the bottom opening of the high-pressure flat gate valve lower shell (1) by screws. Two inlet and outlet pipes (101) are symmetrically welded on the front and rear side walls of the high-pressure flat gate valve lower shell (1). Two rails (103) are symmetrically protruding on the left and right inner walls of the high-pressure flat gate valve lower shell (1). A rectangular sliding frame is slidably installed on the two rails (103). (4); Two rectangular sealing plates (5) are slidably installed on the rectangular sliding frame (4) in a front-to-back orientation, and two L-shaped sliding rods (502) are symmetrically welded to the upper and lower ends of the two sealing plates (5). The eight L-shaped sliding rods (502) are slidably connected to the upper and lower side rods of the rectangular sliding frame (4) in a front-to-back orientation. Two strip-shaped sliding grooves are symmetrically opened on the left and right side rods of the rectangular sliding frame (4), and a support short column (402) is welded and fixed at the middle position of the top of the rectangular sliding frame (4). A screw (401) is rotatably connected to the top of the support short column (402), and the screw (401) is screwed through and screwed into the center of the handwheel (201). Four vertical support limiting rods (102) are symmetrically welded in the semi-elliptical part at the top of the lower shell (1) of the high-pressure flat gate valve. The bottom section of the supporting short column (402) is symmetrically welded with two hexagonal positioning shafts (403). Two sliding plates (404) are symmetrically mounted on the two hexagonal positioning shafts (403) by spring push. The top of each of the two sliding plates (404) is rotatably connected to a connecting rod (405). The head of each connecting rod (405) is rotatably connected to a slip ring (406). The slip ring (406) is slidably engaged with the supporting short column (402). The two strip-shaped sliding grooves are slidably engaged with the two track bars (103). The two sealing plates (5) slide in opposite directions and abut against the tail openings of the two inlet and outlet pipes (101) located inside the lower shell (1) of the high-pressure flat gate valve. The tail ends of the four L-shaped sliding rods (502) on the upper side are all inserted with a limiting stop shaft (503). The two limiting stop shafts (503) are inserted into the bottom section of the two sliding plates (404).

2. The high-pressure flat gate valve as described in claim 1, characterized in that: The top of the bottom cover plate (3) is symmetrically welded with four top rods (301), and the top sections of the four top rods (301) are obliquely cut in opposite directions.

3. The high-pressure flat gate valve as described in claim 1, characterized in that: A ball bearing is embedded at both ends of the two limiting stops (503).

4. The high-pressure flat gate valve as described in claim 3, characterized in that: The four balls abut against the left and right inner walls of the lower shell (1) of the high-pressure flat gate valve, and when the rectangular sliding frame (4) slides upward, the four balls abut against the four vertical support limit rods (102).

5. The high-pressure flat gate valve as described in claim 2, characterized in that: Both of the sealing plates (5) have a stress strip (501) welded on their left and right sides, and the bottom sections of the four stress strips (501) are all obliquely shaped.

6. The high-pressure flat gate valve as described in claim 5, characterized in that: When the two sealing plates (5) slide close to each other, the four force strips (501) abut against the front and rear sides of the left and right side rods of the rectangular sliding frame (4), and when the rectangular sliding frame (4) slides down, the four force strips (501) abut against the inclined surfaces of the four top rods (301).

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