Dual-sealing valve

Abstract

The utility model discloses a dual-sealing valve, and belongs to the technical field of valves. The valve mainly comprises a valve body, an outer side sealing mechanism is arranged in the valve body through a bolt, the interior of the valve body is in threaded connection with a lead screw, and the lead screw is slidably connected to the interior of the valve body. According to the double-sealing-performance valve, the screw rod is rotated into the valve body, when the screw rod moves to the limit, one end of the sliding positioning pin is located in the through hole formed in the screw rod, guiding is provided for taking out of the sliding positioning pin, fixation between the sliding positioning pin and the fixing rod is relieved by means of an external shaft rod, namely, the valve plate, and therefore the double-sealing-performance valve exists as an individual; after the outer side sealing mechanism is detached, the valve plate can freely fall under the action of gravity, so that compared with a traditional double-sealing-performance valve detaching and replacing mode, only the outer side sealing mechanism needs to be detached in the mode, the whole double-sealing-performance valve does not need to be detached, and for a large-size double-sealing-performance valve, the maintenance efficiency is improved, and the maintenance cost is reduced. And the labor intensity of maintenance personnel can be reduced.

Description

Technical Field

[0001] The present application relates to the field of valve technology, and in particular to a double-sealing valve. Background Art

[0002] Valves are important devices in fluid control systems, used to control fluid flow direction, flow rate, pressure and other parameters. There are many types of valves, among which double-seal valves are valves with double sealing structures to provide higher sealing performance and safety.

[0003] This valve is designed with two sealing points. Even if one seal fails, the other seal can still prevent fluid leakage, thus ensuring the sealing performance of the valve and preventing medium leakage. It is particularly suitable for high-pressure, high-corrosion or high-purity working conditions. It is widely used in industries with strict sealing requirements such as chemical, petroleum, natural gas, and pharmaceuticals. However, there are still some shortcomings:

[0004] After long-term use, the sealing gasket at the valve plate of the current double-seal valve will age and deform, resulting in a decrease in sealing performance. When replacing the current double-seal valve, all the bolts fixing the flange need to be removed and the entire valve needs to be separated from the pipeline before replacement. The operation is relatively cumbersome. For larger double-seal valves, the above replacement method is inefficient, which not only prolongs the downtime of the pipeline system but also increases the labor intensity of maintenance personnel.

[0005] Therefore, it is necessary to provide a double sealing valve to solve the above problems.

[0006] It should be noted that the above information disclosed in this Background section is only for understanding the background technology of the present application concept, and therefore, it may contain information that does not constitute prior art. Summary of the Invention

[0007] Based on the above-mentioned problems existing in the prior art, the problem to be solved by the present application is: to provide a double-seal valve, which solves the problem mentioned in the above-mentioned background technology that the current double-seal valve will experience aging and deformation of the sealing gasket at the valve plate inside after long-term use, thereby resulting in a decrease in sealing performance. When replacing the current double-seal valve, all the bolts of the fixing flange need to be removed and the entire valve needs to be separated from the pipeline before replacement. The operation is relatively cumbersome. For larger double-seal valves, the above-mentioned replacement method has low working efficiency, which not only prolongs the downtime of the pipeline system, but also increases the labor intensity of maintenance personnel.

[0008] Described connecting rod is a hollow tube, and its upper end is provided with internal thread and can be spirally connected with the joint of lower sleeve lower end and is spirally connected several connecting rods and prolongs.

[0009] Furthermore, the outer sealing mechanism includes two sealing rings threadedly connected to the inside of the valve body, four sleeves are fixedly connected to the outer wall of the valve body, a spring 1 is fixedly connected to the inside of the sleeve, a sliding rod is slidably connected to the inside of the sleeve, one end of the spring 1 is fixedly connected to the sliding rod, the four sliding rods are grouped into two, and one end of the two groups of sliding rods are fixedly connected to a pressure plate by bolts, and a sealing gasket is fixedly installed on the side of the pressure plate close to the outer wall of the valve body, and the sealing gasket fits tightly against the outer wall of the valve body.

[0010] Furthermore, the inner walls of the two sealing rings are provided with sealing rings, the two sealing rings are in contact with the two valve plates respectively, and the two sealing rings are located inside the two pressure plates respectively.

[0011] Furthermore, a fixed disk is fixedly connected to the top of the valve body, and an adjusting disk is fixedly connected to the top of the screw rod.

[0012] Furthermore, a bidirectional water pump is installed on the outer wall of the valve body, and transmission pipe 1 and transmission pipe 2 are respectively connected to the two ends of the bidirectional water pump. Transmission pipe 1 is inserted into the interior of the valve body, and transmission pipe 1 is inserted into one side of one of the valve plates. One end of transmission pipe 2 is connected to a transmission pipe, and the transmission pipe is inserted between the two valve plates.

[0013] Furthermore, the four screw rods are grouped into two, and the two groups of screw rods correspond to two sliding positioning pins respectively. The interior of the screw rod can be slidably connected to an external shaft rod smaller than the caliber.

[0014] Furthermore, after the sliding positioning pin is separated from the valve plate and the fixing rod, the valve plate will move downward under the action of gravity.

[0015] Furthermore, when the valve plate is opened and closed, the inner cavity of the screw is never in communication with the inner cavity of the valve body.

[0016] The beneficial effects of this application are:

[0017] (1) The present application provides a double-sealed valve, which is rotated into the valve body by rotating the screw. When the movement reaches the limit, one end of the sliding locating pin will be located in the through hole opened inside the screw, providing a guide for the removal of the sliding locating pin. With the help of an external shaft, the shaft is pushed into the screw and pressure is applied to the sliding locating pin. Under the action of external force, the sliding locating pin will be separated from the limit of the limit block, that is, the valve plate will be released from the fixation with the fixed rod, and thus exist as an individual. After the outer sealing mechanism is disassembled, the valve plate can fall freely under the action of gravity, so that it can be more convenient to replace the double-sealed valve. Compared with the traditional disassembly method, the method of replacing the valve plate only replaces the valve plate, and there is no need to disassemble the entire valve plate. Only the outer sealing mechanism needs to be disassembled. This improves the maintenance efficiency for larger double-sealed valves and can also reduce the labor intensity of maintenance personnel.

[0018] (2) The present application provides a double-sealing valve. When the valve plate closes the valve body, the sealing ring on the sealing ring will fit with the valve plate to achieve a sealing effect. In addition, the pressure plate and the sliding rod are fixed by bolts. Under the action of spring 1, the sliding rod will drive the pressure plate to apply pressure to the sealing gasket, which serves as a backup to prevent leakage, thereby improving the sealing performance of the double-sealing valve.

[0019] In addition to the above-described purposes, features and advantages, the present application also has other purposes, features and advantages. The present application will be further described in detail below with reference to the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings in the specification, which constitute a part of this application, are used to provide further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute improper limitations on this application.

[0021] In the attached figure:

[0022] Figure 1 It is a schematic diagram of the overall structure of this application;

[0023] Figure 2 It is a cross-sectional view of the overall structure in this application;

[0024] Figure 3 This is a cross-sectional view of the overall structure in this application from another angle;

[0025] Figure 4 This is a schematic diagram of the overall structure in this application from another angle;

[0026] Figure 5 A cross-sectional view of the outer sealing mechanism portion of the present application;

[0027] Figure 6 Another angle sectional view of the outer sealing mechanism in this application;

[0028] Figure 7 Schematic diagram of the connection relationship between the fixing rod and the valve plate in this application;

[0029] Figure 8 In this application Figure 2 A in the enlarged view.

[0030] Among them, the reference numerals in the figures are:

[0031] 1. Valve body; 2. Outer sealing mechanism; 21. Pressure plate; 22. Bushing; 23. Spring 1; 24. Sliding rod; 25. Sealing gasket; 26. Sealing ring; 27. Sealing ring; 3. Bidirectional water pump; 31. Transmission pipe; 4. Fixed plate; 5. Adjusting plate; 6. Screw; 7. Screw; 8. Sliding locating pin; 9. Valve plate; 10. Limiting block; 11. Fixed rod; 12. Mounting seat; 13. Spring 2; 14. Guide rod. DETAILED DESCRIPTION

[0032] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0033] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0034] like Figures 1-8As shown, the present application provides a double-sealing valve, including a valve body 1, the interior of the valve body 1 is provided with an outer sealing mechanism 2 by bolts, the interior of the valve body 1 is threadedly connected to a screw rod 6, and the screw rod 6 is slidably connected to the interior of the valve body 1, the top of the valve body 1 is fixedly connected to a fixed disk 4, the top of the screw rod 6 is fixedly connected to an adjusting disk 5, the outer wall of the screw rod 6 is fixedly connected to two fixed rods 11, the interior of the fixed rod 11 is slidably connected to two guide rods 14, the top of the guide rod 14 is fixedly connected to a mounting seat 12, two springs 13 are fixedly installed inside the fixed rod 11, one end of the two springs 13 is fixedly connected to the mounting seat 12, and the bottom of the mounting seat 12 is fixedly connected to a limited inclined block 1 0, the internal sliding connection of the fixed rod 11 is provided with a sliding locating pin 8, and the internal sliding connection of the valve body 1 is provided with two valve plates 9, the sliding locating pin 8 passes through the valve plate 9 and the fixed rod 11, and the outer wall of the sliding locating pin 8 is provided with a V-shaped groove, and the limiting bevel 10 can fix the sliding locating pin 8 to the inside of the fixed rod 11 through the V-shaped groove, and the internal thread connection of the valve body 1 is provided with four screws 7, and the interior of the screw 7 is provided with a through hole for accommodating the sliding locating pin 8, and the four screws 7 are grouped in pairs, and the two groups of screws 7 correspond to two sliding locating pins 8 respectively. The interior of the screw 7 can be slidably connected to an external shaft rod smaller than the caliber. After the sliding locating pin 8 is separated from the valve plate 9 and the fixed rod 11, the valve plate 9 will move downward under the action of gravity.

[0035] In this embodiment, the screw rod 6 is driven to slide inside the valve body 1 by rotating the adjusting disk 5, thereby driving the two valve plates 9 to realize the closing and opening operations of the valve body 1. After a long period of use, the sealing components at the valve plates 9 inside thereof will age and deform, resulting in a decrease in the sealing performance. At this time, the valve body 1 is closed by rotating the adjusting disk 5. At this time, the central axis of the sliding locating pin 8 used to fix the valve plate 9 on the fixing rod 11 will coincide with the central axis of the screw rod 7. The screw rod 7 can then be rotated to rotate the screw rod 7 to rotate the screw rod 7 into the valve body 1. When the movement reaches the limit, one end of the sliding locating pin 8 will be located in the through hole opened inside the screw rod 7, providing a guide for the removal of the sliding locating pin 8. Afterwards, with the help of an external shaft rod, the shaft rod is pushed into the screw rod 7, and the sliding locating pin 8 is When pressure is applied, under the action of external force, the sliding positioning pin 8 will disengage from the limit of the limiting bevel 10, wherein the limiting bevel 10, when squeezed, will drive the mounting seat 12 to move upward, and the mounting seat 12 will stretch the spring 2 13 at the same time. After the sliding positioning pin 8 is pushed into the screw rod 7, the valve plate 9 will be released from the fixation with the fixing rod 11, and thus exist as an individual. After the outer sealing mechanism 2 is disassembled, the valve plate 9 can fall freely under the action of gravity, so that when replacing the double-sealing valve, it can be more convenient. Compared with the traditional disassembly method, the method of replacing the valve plate 9 only replaces the valve plate 9, and there is no need to disassemble the entirety. Only the outer sealing mechanism 2 needs to be disassembled. This improves the maintenance efficiency for larger double-sealing valves and can also reduce the labor intensity of maintenance personnel.

[0036] In this embodiment, when installing the replaced valve plate 9, the movement of the sliding positioning pin 8 is opposite to that during the above-mentioned disassembly process. Specifically, the sliding positioning pin 8 in the screw rod 7 is pushed back into the valve plate 9 and the fixed rod 11, and is fixed by the limiting bevel block 10.

[0037] The outer sealing mechanism 2 includes two sealing rings 26 threadedly connected to the inside of the valve body 1, and four shaft sleeves 22 are fixedly connected to the outer wall of the valve body 1. The inside of the shaft sleeve 22 is fixedly connected to a spring 23, and the inside of the shaft sleeve 22 is slidably connected to a slide rod 24. One end of the spring 23 is fixedly connected to the slide rod 24. The four slide rods 24 are grouped into two, and one end of the two groups of slide rods 24 are fixedly connected to a pressure plate 21 by bolts. A sealing gasket 25 is fixedly installed on the side of the pressure plate 21 close to the outer wall of the valve body 1. The sealing gasket 25 fits tightly with the outer wall of the valve body 1. The inner walls of the two sealing rings 26 are provided with sealing rings 27. The two sealing rings 27 are respectively in contact with the two valve plates 9. The two sealing rings 26 are respectively located inside the two pressure plates 21. When the valve plate 9 is opened and closed, the inner cavity of the screw 7 is always not connected to the inner cavity of the valve body 1.

[0038] In this embodiment, the establishment of the outer sealing mechanism 2 can ensure the sealing inside the valve body 1. Specifically, the sealing ring 27 on the sealing ring 26 will fit with the valve plate 9 when the valve plate 9 closes the valve body 1, thereby achieving a sealing effect. In addition, the pressure plate 21 and the slide rod 24 are fixed by bolts. Under the action of the spring 23, the slide rod 24 will drive the pressure plate 21 to apply pressure to the sealing gasket 25, which serves as a backup for leakage prevention, thereby improving the sealing performance of the double-sealing valve.

[0039] A two-way water pump 3 is installed on the outer wall of the valve body 1. The two ends of the two-way water pump 3 are respectively connected with transmission pipe 1 and transmission pipe 2. Transmission pipe 1 is inserted into the inside of the valve body 1, and transmission pipe 1 is inserted into one side of one of the valve plates 9. One end of transmission pipe 2 is connected with transmission pipe 31, and transmission pipe 31 is inserted between the two valve plates 9.

[0040] In this embodiment, after the two valve plates 9 are closed, the water source therebetween can be transported back to the original pipeline via the bidirectional water pump 3 , thereby facilitating subsequent disassembly and replacement operations.

[0041] Working principle:

[0042] When in use, the double-sealing valve is installed in the pipeline system through the connecting flange. The rotation of the adjusting disk 5 drives the screw rod 6 to slide inside the valve body 1, thereby driving the two valve plates 9 to realize the closing and opening operations of the valve body 1. After long-term use, the sealing components at the valve plates 9 inside will age and deform, resulting in a decrease in sealing performance. At this time, the valve body 1 is closed by rotating the adjusting disk 5. At this time, the central axis of the sliding locating pin 8 used to fix the valve plate 9 on the fixing rod 11 will coincide with the central axis of the screw rod 7. Subsequently, the screw rod 7 can be rotated to turn the screw rod 7 into the valve body 1. When the movement reaches the limit, One end of the sliding positioning pin 8 will be located in the through hole opened inside the screw rod 7, providing a guide for the removal of the sliding positioning pin 8. After that, with the help of an external shaft rod, the shaft rod is pushed into the screw rod 7 and pressure is applied to the sliding positioning pin 8. Under the action of the external force, the sliding positioning pin 8 will be separated from the limit of the limiting bevel 10. When the limiting bevel 10 is squeezed, it will drive the mounting seat 12 to move upward. The mounting seat 12 will stretch the spring 2 13 at the same time. After the sliding positioning pin 8 is pushed into the screw rod 7, the valve plate 9 will be released from the fixation with the fixing rod 11, so that it exists as an individual. After the outer sealing mechanism 2 is disassembled, it can fall freely under the action of gravity and thus be replaced.

[0043] When installing the replaced valve plate 9, the movement of the sliding positioning pin 8 is opposite to that during the above-mentioned disassembly process. Specifically, the sliding positioning pin 8 in the screw rod 7 is pushed back into the valve plate 9 and the fixing rod 11, and is fixed by the limiting bevel block 10.

[0044] Among them, the establishment of the outer sealing mechanism 2 can ensure the sealing inside the valve body 1. Specifically, the sealing ring 27 on the sealing ring 26 will fit with the valve plate 9 when the valve plate 9 closes the valve body 1, thereby achieving a sealing effect. In addition, the pressure plate 21 and the slide rod 24 are fixed by bolts. Under the action of the spring 23, the slide rod 24 will drive the pressure plate 21 to apply pressure to the sealing gasket 25, which serves as a backup for leakage prevention, thereby improving the sealing performance of the double-sealing valve. For the disassembly of the outer sealing mechanism 2, the pressure plate 21 and the sealing ring 26 can be disassembled in turn.

[0045] Before the above-mentioned disassembly of the outer sealing mechanism 2, after the two valve plates 9 are closed, the water source between them can be transported back to the original pipeline through the two-way water pump 3, thereby facilitating subsequent disassembly and replacement operations.

[0046] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A double-sealing valve, comprising a valve body (1), characterized in that: The interior of the valve body (1) is provided with an outer sealing mechanism (2) by means of bolts, the interior of the valve body (1) is connected to a screw rod (6) by means of a threaded connection, and the screw rod (6) is slidably connected to the interior of the valve body (1), the outer wall of the screw rod (6) is fixedly connected to two fixing rods (11), the interior of the fixing rod (11) is slidably connected to two guide rods (14), the top of the guide rod (14) is fixedly connected to a mounting seat (12), the interior of the fixing rod (11) is fixedly installed with two springs (13), one end of each of the two springs (13) is fixedly connected to the mounting seat (12), and the mounting seat The bottom of (12) is fixedly connected with a limiting inclined block (10), the interior of the fixed rod (11) is slidably connected with a sliding positioning pin (8), the interior of the valve body (1) is slidably connected with two valve plates (9), the sliding positioning pin (8) passes through the valve plate (9) and the fixed rod (11), the outer wall of the sliding positioning pin (8) is provided with a V-shaped groove, the limiting inclined block (10) can fix the sliding positioning pin (8) to the interior of the fixed rod (11) through the V-shaped groove, the interior of the valve body (1) is threadedly connected with four screw rods (7), and the interior of the screw rods (7) is provided with a through hole for accommodating the sliding positioning pin (8).

2. A double sealing valve according to claim 1, characterized in that: The outer sealing mechanism (2) includes two sealing rings (26) threadedly connected to the inside of the valve body (1), the outer wall of the valve body (1) is fixedly connected with four shaft sleeves (22), the inside of the shaft sleeve (22) is fixedly connected with a spring (23), the inside of the shaft sleeve (22) is slidably connected with a slide rod (24), one end of the spring (23) is fixedly connected to the slide rod (24), the four slide rods (24) are grouped into two, and one end of the two groups of slide rods (24) are fixedly connected to a pressure plate (21) by bolts, and a sealing gasket (25) is fixedly installed on the side of the pressure plate (21) close to the outer wall of the valve body (1), and the sealing gasket (25) is tightly fitted with the outer wall of the valve body (1).

3. A double sealing valve according to claim 2, characterized in that: The inner walls of the two sealing rings (26) are provided with sealing rings (27), the two sealing rings (27) are in contact with the two valve plates (9) respectively, and the two sealing rings (26) are located inside the two pressure plates (21) respectively.

4. The double-sealing valve according to claim 1, characterized in that: The top of the valve body (1) is fixedly connected to a fixed disk (4), and the top of the screw rod (6) is fixedly connected to an adjusting disk (5).

5. The double sealing valve according to claim 1, characterized in that: A bidirectional water pump (3) is installed on the outer wall of the valve body (1), and a transmission pipe 1 and a transmission pipe 2 are respectively connected to the two ends of the bidirectional water pump (3). The transmission pipe 1 is inserted into the interior of the valve body (1), and the transmission pipe 1 is inserted into one side of one of the valve plates (9). A transmission pipe (31) is inserted into one end of the transmission pipe 2, and the transmission pipe (31) is inserted between the two valve plates (9).

6. The double sealing valve according to claim 1, characterized in that: The four screw rods (7) are grouped into two groups, and the two groups of screw rods (7) correspond to two sliding positioning pins (8). The inside of the screw rods (7) is provided with a caliber corresponding to the sliding positioning pins (8), and the inside of the caliber can be slidably connected to an external shaft rod smaller than the caliber.

7. The double-sealing valve according to claim 1, characterized in that: After the sliding positioning pin (8) is separated from the valve plate (9) and the fixing rod (11), the valve plate (9) will move downward under the action of gravity.

8. The double-sealing valve according to claim 1, characterized in that: When the valve plate (9) is opened and closed, the inner cavity of the screw (7) is never in communication with the inner cavity of the valve body (1).

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