Double-layer sealing gate valve

Abstract

The utility model relates to the technical field of valves, in particular to a double-layer sealing gate valve which comprises a lower shell, an upper shell, pipelines, a sealing assembly and a lubricating assembly, bolts are arranged on the lower portion of the upper shell, the lower portion of the upper shell is fixedly connected with the upper portion of the lower shell through the bolts, and the pipelines are fixedly connected to the two sides of the lower shell. The sealing assembly is arranged in the lower shell and used for dividing and sealing fluid when needed and adjusting the flow speed. And the lubricating assembly is arranged in the upper shell and used for lubricating the workpiece when the lubricating assembly is matched with the sealing assembly to work, normal work between parts is guaranteed, the service life is prolonged, and the rotating difficulty is reduced. Compared with the prior art, the problems that in the prior art, the sealing performance of a sealing gate is insufficient, and meanwhile self-lubricating cannot be conducted on a rotating structure are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a double-layer sealing gate valve. Background Art

[0002] The gate valve is a gate plate of an opening and closing part. The movement direction of the gate plate is perpendicular to the direction of the fluid. The gate valve can only be fully opened and fully closed, and cannot be adjusted or throttled. The gate valve is sealed by the contact between the valve seat and the gate plate. Usually, the sealing surface will be welded with metal materials to increase wear resistance, such as cladding 1Cr13, STL6, stainless steel, etc. The gate plate has a rigid gate plate and an elastic gate plate. According to the different gate plates, the gate valve is divided into a rigid gate valve and an elastic gate valve.

[0003] In the prior art, a Chinese patent document with publication number CN215059600U proposes a double-layer sealed gate valve that achieves a multi-layer sealing effect by using an end cover, a sealing steel sleeve, a bellows and a sealing packing in combination. The valve cover is threadedly connected to the inside of the inner thread groove of the valve column through an external threaded ring column, so that the valve column and the valve cover are more convenient to install and disassemble, thereby improving the sealing of the gate valve. However, in actual applications, single-layer valves often have insufficient sealing performance. At the same time, conventional valves will rust after long-term use, increasing friction and making it inconvenient to rotate the gate. Utility Model Content

[0004] In view of this, the purpose of the utility model is to provide a double-layer sealing gate valve to solve the problem that the sealing gate in the traditional technology has insufficient sealing performance and cannot self-lubricate the rotating structure.

[0005] Based on the above purpose, the utility model provides a double-layer sealing gate valve, including a lower shell, an upper shell, a pipeline, a sealing assembly and a lubrication assembly, wherein bolts are arranged below the upper shell, the lower part of the upper shell is fixedly connected with the upper part of the lower shell by the bolts, and the pipeline is fixedly connected to both sides of the lower shell;

[0006] A sealing assembly, which is arranged inside the lower housing and is used to divide and seal the fluid when necessary and to adjust the flow rate;

[0007] A lubrication component is arranged inside the upper shell and is used to lubricate the workpiece when working with the sealing component to ensure normal operation of the parts, extend the service life and reduce the difficulty of rotation.

[0008] Preferably, the sealing assembly includes a screw rod, a moving block is threadedly connected below the screw rod, fixed blocks are arranged on both sides of the moving block, a first sealing ring is arranged below the fixed block, a second sealing ring is arranged on one side of the first sealing ring, a fixing rod is arranged through the two first sealing rings, guide plates are fixedly connected on both sides of the first sealing ring, and an expansion hole is opened at the middle connection of the two first sealing rings.

[0009] Preferably, the lubrication assembly includes a rotating rod, a limit screw is sleeved at the bottom of the rotating rod, an oil storage chamber is provided on one side of the limit screw, an arc groove is opened at the bottom of one side of the oil storage chamber, an elastic block is provided inside the arc groove, and a compression body is fixedly connected to the rotating rod, and the compression body and the arc groove correspond to each other and are used in conjunction with each other.

[0010] Preferably, a rotating disk is fixedly connected to the top of the rotating rod, and the bottom of the rotating rod is fixedly connected to the screw rod.

[0011] Preferably, the lower part of the screw is conical, and the diameter of the expansion hole is smaller than the diameter of the upper part of the screw.

[0012] Preferably, the two first sealing rings are limited by a fixing rod, and a spring is provided between the two first sealing rings to bring them closer to each other through the spring.

[0013] Preferably, the elastic block is an elastic block with slopes on both sides, and the bottom of the elastic block is connected to the inner wall of the oil storage cavity.

[0014] Preferably, a groove having the same size as the elastic block is provided on one side of the oil storage cavity below the elastic block.

[0015] Preferably, the first sealing ring is a shape memory alloy of nickel-titanium alloy, and the second sealing ring is a fluororubber material.

[0016] Beneficial effects of the utility model:

[0017] 1. This double-layer sealed gate valve is provided with a sealing component, so that the device can better seal the pipeline and control the flow during use. At the same time, the two sealing rings of different materials can ensure a better sealing effect. While providing good initial sealing performance, it can automatically adjust the sealing state under different operating conditions to provide additional sealing performance.

[0018] 2. This double-layer sealed gate valve is provided with a lubrication component, which produces a lubrication effect only when the valve is opened or closed, thereby reducing the wear between friction parts, extending the service life, and also reducing the waste of resources, further improving the practicality of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0021] Figure 2 This is a schematic diagram of the internal structure of the utility model;

[0022] Figure 3 This is a schematic diagram of the sealing assembly structure of the utility model from the first perspective;

[0023] Figure 4 This is a schematic diagram of the sealing assembly structure of the utility model from a second viewing angle;

[0024] Figure 5 This is a schematic diagram of the structure of the lubrication component of the utility model;

[0025] Figure 6 For this utility model Figure 3 A schematic diagram of the enlarged structure in the middle.

[0026] The markings in the figure are:

[0027] 1. Lower shell; 2. Upper shell; 3. Pipe; 4. Turntable; 5. Bolt; 6. Screw; 7. Limit screw; 8. Oil storage chamber; 9. Fixed block; 10. Moving block; 11. First sealing ring; 12. Second sealing ring; 13. Fixed rod; 14. Guide plate; 15. Rotating rod; 16. Expansion hole; 17. Elastic block; 18. Arc groove; 19. Compression body. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0029] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0030] like Figures 1 to 6 As shown, a double-layer sealing gate valve comprises a lower shell 1, an upper shell 2, a pipeline 3, a sealing assembly and a lubricating assembly. Bolts 5 are arranged below the upper shell 2. The lower part of the upper shell 2 is fixedly connected with the upper part of the lower shell 1 by the bolts 5. The pipeline 3 is fixedly connected to both sides of the lower shell 1.

[0031] like Figures 2 to 4As shown, the sealing assembly is arranged inside the lower housing 1, and is used to divide and seal the fluid when necessary, and to adjust the flow rate, including a screw 6, a moving block 10 is threadedly connected below the screw 6, fixed blocks 9 are arranged on both sides of the moving block 10, a first sealing ring 11 is arranged below the fixed block 9, a second sealing ring 12 is arranged on one side of the first sealing ring 11, a fixing rod 13 is arranged through the first sealing rings 11, guide plates 14 are fixedly connected on both sides of the first sealing rings 11, an expansion hole 16 is opened at the middle connection of the two first sealing rings 11, and the screw The bottom of the screw 6 is conical, and the diameter of the expansion hole 16 is smaller than the diameter of the top of the screw 6. The two first sealing rings 11 are limited by the fixing rod 13. At the same time, a spring is provided between the two first sealing rings 11, and the spring is used to approach each other. The first sealing ring 11 and the second sealing ring 12 can effectively divide and seal the fluid to prevent leakage. The screw 6 can be moved up and down by being threadedly connected with the moving block 10, so as to adjust the flow rate of the fluid. The bottom of the screw 6 is conical. When it moves downward, it will push the first sealing ring 11 through the expansion hole 16 to achieve expansion sealing. This design ensures that the sealing ring can fit tightly when needed to achieve a better sealing effect. The fixing rod 13 limits the maximum distance between the two first sealing rings 11 to prevent excessive expansion. At the same time, the setting of the spring enables the first sealing ring 11 to be close to and restored to its original position when the screw rod 6 moves downward, so that the sealing ring can be automatically reset. The guide plate 14 provides good stability and guidance to ensure that the sealing ring will not deviate during the expansion and recovery process, thereby ensuring the consistency of the sealing effect. In the initial state during use of the device, the screw rod 6 is in the upper position and the first sealing ring 11 is in the upper position. The screw 6 is close to the second sealing ring 12 to maintain the sealed state, and the fluid is divided and sealed. When the fluid flow rate needs to be adjusted, the screw 6 rotates downward and drives the moving block 10 upward through the threaded connection. As the screw 6 moves downward, the tapered part enters the expansion hole 16, so that the two first sealing rings 11 are limited by the maximum spacing through the fixed rod 13 and are pushed apart at the same time to achieve the expansion and sealing of the sealing rings. After the expansion and sealing, the flow rate of the fluid is adjusted according to the moving distance of the screw 6 and the expansion degree of the sealing ring. When it is necessary to close or restore the initial state, the screw 6 rotates upward and drives the moving block 10 downward through the threaded connection. The tapered part gradually withdraws from the expansion hole 16, and the spring force makes the two first sealing rings 11 close to each other and return to the initial position, and the sealing is realized again;

[0032] like Figures 5 and 6As shown, a lubrication component is arranged inside the upper shell 2, and is used to lubricate the workpiece when working with the sealing component, so as to ensure the normal operation of the parts, prolong the service life and reduce the difficulty of rotation. It includes a rotating rod 15, a limit screw 7 is sleeved below the rotating rod 15, an oil storage chamber 8 is arranged on one side of the limit screw 7, an arc groove 18 is opened below one side of the oil storage chamber 8, an elastic block 17 is arranged inside the arc groove 18, a pressing body 19 is fixedly connected to the rotating rod 15, the pressing body 19 and the arc groove 18 correspond to each other and are used in conjunction with each other, the elastic block 17 is an elastic block 17 with slopes on both sides, the bottom of the elastic block 17 is connected to the inner wall of the oil storage chamber 8, and a groove with the same size as the elastic block 17 is opened on one side of the oil storage chamber 8 below the elastic block 17. The lubrication component can lubricate the rotating rod 15 and the oil storage chamber 8 through the lubricating oil in the oil storage chamber 8 and the arc groove 18. Continuous lubrication is provided between other contact parts to reduce friction and wear and ensure smooth operation of parts. Effective lubrication can reduce wear between parts, extend the service life of equipment, and reduce maintenance frequency and cost. The combination of the compression body 19 and the arc groove 18 enables the lubricating oil to be automatically released during the rotation process to provide continuous lubrication without frequent manual addition of lubricating oil. When the device is in operation, in the initial state, the rotating rod 15 is fixed inside the upper shell 2, the limit screw 7 positions the rotating rod 15, and the oil storage chamber 8 stores lubricating oil. When the rotating rod 15 starts to rotate, the compression body 19 fixed on the rotating rod 15 also rotates accordingly. As the rotating rod 15 and the compression body 19 rotate, the compression body 19 gradually contacts the elastic block 17 in the arc groove 18, and the compression body 19 applies pressure to the elastic block 17 in the arc groove 18, so that the elastic block 17 compresses the lubricating oil in the oil storage chamber 8. Since the elastic block 17 has slopes on both sides, when it is subjected to the pressure of the pressure body 19, the lubricating oil will be squeezed out from the arc groove 18, and the lubricating oil will be transported to the parts that need lubrication through the arc groove 18. The lubricating oil flows through the arc groove 18 to lubricate the rotating rod 15 and other contact parts, reducing friction and wear and ensuring smooth operation of the parts. When the pressure body 19 rotates away from the elastic block 17, the elastic block 17 returns to its original state under the action of its own elasticity, and the pressure of the lubricating oil in the oil storage chamber 8 is also restored.

[0033] Further, such as Figure 2 As shown, the top of the rotating rod 15 is fixedly connected to the turntable 4, and the bottom of the rotating rod 15 is fixedly connected to the screw 6. The fixedly connected rotating rod 15, the turntable 4 and the screw 6 can ensure stable power transmission and timely response, so that when the turntable 4 is controlled, other structures also respond in the same way.

[0034] Further, such as Figure 3As shown, the first sealing ring 11 is a shape memory alloy of nickel-titanium alloy, and the second sealing ring 12 is a fluororubber material. By adopting a double sealing design of nickel-titanium alloy shape memory alloy and fluororubber material, the sealing assembly can provide a stable and reliable sealing effect under a variety of harsh working conditions, thereby enhancing the overall performance and reliability of the device.

[0035] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples. Under the concept of the present invention, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity.

[0036] The utility model is intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the scope of protection of the utility model.

Claims

1. A double-layer sealing gate valve, characterized in that: include: A lower shell (1), an upper shell (2), a pipeline (3), a sealing assembly and a lubrication assembly, wherein a bolt (5) is provided below the upper shell (2), the lower part of the upper shell (2) and the upper part of the lower shell (1) are fixedly connected via the bolt (5), and the pipeline (3) is fixedly connected to both sides of the lower shell (1); A sealing assembly, which is arranged inside the lower housing (1) and is used to divide and seal the fluid when necessary, and to adjust the flow rate; A lubrication component is arranged inside the upper shell (2) and is used to lubricate the workpiece when working with the sealing component, thereby ensuring normal operation of parts, extending service life and reducing rotation difficulty.

2. A double-layer sealing gate valve according to claim 1, characterized in that: The sealing assembly comprises a screw rod (6), a moving block (10) is threadedly connected below the screw rod (6), fixed blocks (9) are arranged on both sides of the moving block (10), a first sealing ring (11) is arranged below the fixed block (9), a second sealing ring (12) is arranged on one side of the first sealing ring (11), a fixing rod (13) is arranged through the first sealing rings (11), guide plates (14) are fixedly connected to the two sides of the first sealing ring (11), and an expansion hole (16) is opened at the middle connection of the two first sealing rings (11).

3. A double-layer sealing gate valve according to claim 2, characterized in that: The utility model comprises a rotating rod (15), a limit screw (7) is sleeved below the rotating rod (15), an oil storage chamber (8) is arranged on one side of the limit screw (7), an arc groove (18) is opened below one side of the oil storage chamber (8), an elastic block (17) is arranged inside the arc groove (18), a compression body (19) is fixedly connected to the rotating rod (15), and the compression body (19) and the arc groove (18) correspond to each other and are used in combination.

4. A double-layer sealing gate valve according to claim 3, characterized in that: The top of the rotating rod (15) is fixedly connected to a rotating disk (4), and the bottom of the rotating rod (15) is fixedly connected to the screw rod (6).

5. A double-layer sealing gate valve according to claim 2, characterized in that: The lower part of the screw (6) is conical, and the diameter of the expansion hole (16) is smaller than the diameter of the upper part of the screw (6).

6. A double-layer sealing gate valve according to claim 2, characterized in that: The two first sealing rings (11) are limited in position by a fixing rod (13), and a spring is provided between the two first sealing rings (11), and the two first sealing rings (11) are brought closer to each other by the spring.

7. A double-layer sealing gate valve according to claim 3, characterized in that: The elastic block (17) is an elastic block with slopes on both sides, and the bottom of the elastic block (17) is connected to the inner wall of the oil storage cavity (8).

8. A double-layer sealing gate valve according to claim 3, characterized in that: A groove having the same size as the elastic block (17) is provided on one side of the oil storage cavity (8) below the elastic block (17).

9. A double-layer sealing gate valve according to claim 2, characterized in that: The first sealing ring (11) is a nickel-titanium shape memory alloy, and the second sealing ring (12) is made of a fluororubber material.

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