Low-torque high-sealing gate valve

Abstract

The utility model relates to the technical field of gate valves, and discloses a low-torque high-sealing gate valve which comprises a valve body, a sealing assembly and a valve element assembly, the valve body is fixedly connected with a valve cover through a bolt, a valve rod is movably installed in the valve cover, the sealing assembly comprises a sealing gasket, and the valve element assembly is fixedly connected with the valve body through a bolt. The sealing gasket is arranged between the valve body and the valve cover, two spring bases are arranged on the two sides of the inner wall of the sealing gasket, supporting springs are arranged on the outer walls of the spring bases, connecting rods are fixedly connected to the outer walls of the supporting springs, bearings are fixedly connected to the outer walls of the connecting rods, and the bearings are movably installed on the outer wall of the valve rod. Through cooperation of the tension spring and the valve element, acting force is continuously provided for the valve element through elasticity of the tension spring, sealing strips on the two sides of the valve element are tightly attached to a partition plate in the valve body, leakage caused by the fact that water flow below enters the upper portion of the valve body is prevented, and the sealing performance is enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of gate valves, in particular to a low-torque high-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 difference in the gate plate, the gate valve is divided into a rigid gate valve and an elastic gate valve. The low-torque valve is a specially designed valve with a low torque value, which is usually used in occasions requiring a small torque. This valve uses special sealing materials and structural design, which can achieve good sealing effect at a low torque, while having high safety performance and service life.

[0003] For example, the Chinese patent "CN218992407U" discloses a low-torque soft-sealed gate valve, which proposes that: a hand wheel is installed on the end of the valve stem located outside the valve body, two partitions are provided on the left and right inner cavity walls of the valve body, and a guide wheel unit that can reduce torque is provided in the guide cavity between the two partitions, and the guide wheel unit is installed on the side end of the elastic valve disc. A partition and a guide wheel unit composed of a mounting shaft, a rolling ring, a baffle, a limit plate and a universal ball are provided, and the rolling friction between the two partitions is achieved by the rolling ring, and the rolling friction between the baffle and the inner cavity wall of the valve body is achieved by the universal ball, thereby reducing the friction between the elastic valve disc and the valve body, and finally reducing the torque required for the valve stem to rotate.

[0004] It can be seen from the above-mentioned device that although the above-mentioned device provides a method for reducing the friction between the valve disc and the valve body, the applicant believes that the following defects still exist:

[0005] During normal use, the existing low-torque sealing gate valve has low sealing performance when the valve is closed due to low torque and small force. After long-term use, it is easy to loosen, resulting in poor sealing and the valve cannot be closed tightly. The valve core is also easy to loosen during use, causing water to flow from the valve core into the top of the valve body and out from the valve cover or handle connection. Utility Model Content

[0006] 1. Technical issues to be solved

[0007] In view of the deficiencies in the prior art, the utility model provides a low-torque high-sealing gate valve, which has the advantages that the valve body can still maintain high sealing under low torque conditions, and the valve core is still firmly fixed to prevent water leakage during long-term use. This solves the problem that the existing low-torque sealing gate valve has low sealing performance when the valve is closed due to low torque and small force during normal use, and is prone to loosening after long-term use, resulting in poor sealing and the inability to close the valve tightly. The valve core is also prone to loosening during use, causing water to flow from the valve core into the top of the valve body and out from the valve cover or handle connection.

[0008] (II) Technical solution

[0009] To achieve the above object, the utility model provides the following technical solution: a low torque high sealing gate valve, comprising a valve body, a sealing assembly, and a valve core assembly, wherein the valve body is fixedly connected to a valve cover by bolts, and a valve stem is movably installed inside the valve cover;

[0010] The sealing assembly includes a sealing gasket, which is arranged between the valve body and the valve cover. Two spring bases are arranged on both sides of the inner wall of the sealing gasket. The outer wall of the spring base is provided with a supporting spring. The outer wall of the supporting spring is fixedly connected to a connecting rod. The outer wall of the connecting rod is fixedly connected to a bearing. The bearing is movably mounted on the outer wall of the valve stem.

[0011] Preferably, two connecting bases are fixedly provided on both sides of the outer wall of the bearing, a support rod is fixedly installed on the outer wall of the connecting base, a tension spring is fixedly connected to the outer wall of the support rod, and the tension spring is sleeved and installed on the outer wall of the spring sleeve column.

[0012] Preferably, two connecting flanges are provided on both sides of the valve body, a handle is fixedly connected above the valve stem, and two isolation plates are provided on both sides of the inside of the valve body.

[0013] Preferably, the valve core assembly includes a valve core, and the two spring sleeve columns are fixedly installed on both sides above the valve core.

[0014] Preferably, a valve stem is movably installed inside the valve core, and a plurality of sealing strips are provided on the outer walls on both sides of the valve core, and the plurality of sealing strips are sealingly fitted to the outer wall of the isolation plate.

[0015] Preferably, a connector is fixedly mounted on the outer wall of the lower end of the valve stem, a valve plate is fixedly connected to the outer wall of the connector, and the valve plate is arranged in a water through hole opened by the valve core.

[0016] Preferably, a limit seat is fixedly mounted on the outer wall of the valve core, a limit rod is movably mounted inside the limit seat, and the limit rod is fixedly mounted on the outer wall of the valve core.

[0017] Preferably, a magnetic block is disposed on the outer wall of the valve core, and a limiting magnetic plate is disposed on the outer wall of the valve core, and the magnetic block and the limiting magnetic plate attract each other.

[0018] Preferably, a sealing ring is provided on the outer wall of the valve core, and a fixing plate is provided on the outer wall of the sealing ring. The fixing plate is fixedly mounted on the outer wall of the valve core via a fixing rod, and the sealing ring is sealingly fitted with the valve plate when the valve plate is in a closed state.

[0019] (III) Beneficial effects

[0020] Compared with the prior art, the utility model provides a low-torque high-sealing gate valve, which has the following beneficial effects:

[0021] 1. The low-torque high-sealing gate valve achieves the supporting force provided by the supporting spring through the cooperation between the sealing gasket and the supporting spring, so that the sealing gasket can fit firmly between the valve cover and the valve body. After long-term use, the elasticity of the sealing gasket decreases, and it can still maintain a tight fit without maintenance or replacement.

[0022] 2. The low-torque high-sealing gate valve achieves the goal of continuously providing force to the valve core through the elasticity of the tension spring through the cooperation between the tension spring and the valve core, so that the sealing strips on both sides of the valve core fit tightly with the isolation plate inside the valve body, preventing the water flow from below from entering the top of the valve body and causing leakage, thereby enhancing the sealing performance.

[0023] 3. The low-torque high-sealing gate valve uses a limit magnetic plate to adsorb the magnetic block on the outside of the valve plate. When the valve plate is closed, the limit magnetic plate limits the movement of the valve plate and adsorbs it magnetically, so that the valve plate and the sealing ring always maintain a sealed state to prevent water leakage, and when the valve plate is opened, the overall torque and friction are small. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0025] Figure 2 This is a schematic diagram of the internal structure of the valve body of the utility model;

[0026] Figure 3 This is a schematic diagram of the sealing component structure of the utility model;

[0027] Figure 4 This is a schematic diagram of the back structure of the valve core assembly of the utility model;

[0028] Figure 5 This is a schematic diagram of the front explosion structure of the valve core component of the utility model.

[0029] The numbers in the figure are:

[0030] 1. Valve body; 11. Connecting flange; 12. Valve cover; 13. Valve stem; 14. Handle; 15. Isolation plate; 2. Sealing assembly; 21. Sealing gasket; 22. Spring base; 23. Support spring; 24. Connecting rod; 25. Bearing; 26. Connecting base; 27. Support rod; 28. Tension spring; 29. ​​Spring sleeve; 3. Valve core assembly; 31. Valve core; 32. Connecting head; 33. Valve plate; 34. Limit seat; 35. Limit rod; 36. Magnetic block; 37. Limit magnetic plate; 38. Sealing ring; 39. Fixing plate; 310. Fixing rod; 311. Sealing strip. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] See also Figure 1-2 A low torque high sealing gate valve comprises a valve body 1, a sealing assembly 2 and a valve core assembly 3. The valve body 1 is fixedly connected with a valve cover 12 by bolts, a valve stem 13 is movably installed inside the valve cover 12, two connecting flanges 11 are arranged on both sides of the valve body 1, a handle 14 is fixedly connected above the valve stem 13, and two isolation plates 15 are arranged on both sides of the valve body 1.

[0033] See also Figure 2-3 The sealing assembly 2 includes a sealing gasket 21, which is arranged between the valve body 1 and the valve cover 12 and is used to seal the internal space of the valve body to prevent medium leakage. Two spring bases 22 are arranged on both sides of the inner wall of the sealing gasket 21, and a supporting spring 23 is arranged on the outer wall of the spring base 22. The supporting spring 23 can provide a certain elastic force, so that the sealing gasket 21 fits the surface of the valve body and the valve cover 12 more closely, thereby improving the sealing effect. A connecting rod 24 is fixedly connected to the outer wall of the supporting spring 23, and a bearing 25 is fixedly connected to the outer wall of the connecting rod 24. The bearing 25 is movably installed on the outer wall of the valve stem 13. Two connecting bases 26 are fixedly arranged on both sides of the outer wall of the bearing 25, and a supporting rod 27 is fixedly installed on the outer wall of the connecting base 26. A tension spring 28 is fixedly connected to the outer wall of the support rod 27, and the tension spring 28 can provide a certain tension, so that the bearing always maintains a close contact with the valve stem 13, thereby improving the smoothness of the valve operation and the sealing performance. The tension spring 28 is sleeved and installed on the outer wall of the spring sleeve column 29, and the outer wall of the connecting base 26 is fixedly installed with a supporting rod 27. The support rod 27 can provide additional support force, so that the bearing can run more stably and reduce wear.

[0034] See also Figure 3-5The valve core assembly 3 includes a valve core 31, two spring sleeves 29 are fixedly installed on both sides above the valve core 31, a valve stem 13 is movably installed inside the valve core 31, a plurality of sealing strips 311 are arranged on the outer walls on both sides of the valve core 31, and the plurality of sealing strips 311 are sealed and attached to the outer wall of the isolation plate 15, a connector 32 is fixedly installed on the outer wall of the lower end of the valve stem 13, a valve plate 33 is fixedly connected to the outer wall of the connector 32, and the valve plate 33 is arranged in the water through hole opened in the valve core 31, a limit seat 34 is fixedly installed on the outer wall of the valve core 31, and the limit seat 34 is limited by the internal movably installed limit seat 34. A positioning rod 35 is provided, and a limiting rod 35 is fixedly installed on the outer wall of the valve core 31. A magnetic block 36 is provided on the outer wall of the valve core 31. A limiting magnetic plate 37 is provided on the outer wall of the valve core 31. The magnetic block 36 and the limiting magnetic plate 37 attract each other, thereby increasing the stability of the valve operation and preventing the valve core 31 from accidentally moving when it is disturbed by the outside. A sealing ring 38 is provided on the outer wall of the valve core 31. A fixing plate 39 is provided on the outer wall of the sealing ring 38. The fixing plate 39 is fixedly installed on the outer wall of the valve core 31 by a fixing rod 310. The sealing ring 38 is sealed and fitted with the valve plate 33 when the valve plate 33 is in a closed state.

[0035] Working principle: First, the valve body 1 is installed on the pipe to be connected through the connecting flanges 11 on both sides of the valve body 1. After the valve body 1 is installed, the connecting rod valve stem 13 can be driven to rotate through the handle 14, and the valve stem 13 drives the valve plate 33 to rotate to control the opening and closing of the valve. During the rotation of the valve stem 13, since the bearing 25 is arranged on the outer wall of the valve stem 13, the bearing 25 does not rotate with the valve stem 13. The two connecting rods 24 arranged on the outer wall of the bearing 25 are connected to the outer wall of the sealing gasket 21 through the supporting spring 23, so that the sealing gasket is always tightly fitted to the valve cover 12 and the inside of the valve body 1 to prevent the elasticity of the sealing gasket 21 from weakening due to long-term use. Leakage, and the support rod 27 is fixed by the connecting base 26 on both sides of the bearing 25. The support rod 27 is connected to the top of the valve core 31 through the tension spring 28, so that not only the stability of the bearing 25 can be guaranteed, but also the downward pressure on the valve core 31 can be provided through the tension spring 28, so that the valve core 31 is tightly fitted to the upper surface of the valve core 31 through the sealing strip 311, ensuring the overall sealing of the valve body 1.

[0036] Secondly, when rotating the handle 14 to adjust the opening and closing of the valve plate 33, due to the setting of the limiting magnetic plate 37, the valve plate 33 can only be rotated in a single direction to control the opening and closing, and when opening the valve plate 33, the overall force is only through the adsorption force of the magnetic block 36 and the limiting magnetic plate 37, and the friction force of the sealing ring 38 on the valve plate 33. The overall torque is small, and while maintaining a small torque, a two-way pressure of 25 kg can be achieved through the mutual adsorption of the magnetic block 36 and the limiting magnetic plate 37. When closing the valve, the handle 14 can be rotated in the opposite direction. When the valve plate 33 is closed, the limiting magnetic plate 37 is used to keep the valve plate 33 and the sealing ring 38 always in a sealed fit, thereby achieving the effect of overall sealing of the valve body 1.

[0037] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0038] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A low-torque high-sealing gate valve, comprising a valve body (1), a sealing assembly (2), and a valve core assembly (3), characterized in that: The valve body (1) is fixedly connected to a valve cover (12) by means of bolts, and a valve stem (13) is movably mounted inside the valve cover (12); The sealing assembly (2) comprises a sealing gasket (21), wherein the sealing gasket (21) is arranged between the valve body (1) and the valve cover (12), two spring bases (22) are arranged on both sides of the inner wall of the sealing gasket (21), and a supporting spring (23) is arranged on the outer wall of the spring base (22), and the outer wall of the supporting spring (23) is fixedly connected to a connecting rod (24), and the outer wall of the connecting rod (24) is fixedly connected to a bearing (25), and the bearing (25) is movably mounted on the outer wall of the valve stem (13).

2. The low torque high sealing gate valve according to claim 1, characterized in that: Two connecting bases (26) are fixedly arranged on both sides of the outer wall of the bearing (25); a support rod (27) is fixedly installed on the outer wall of the connecting base (26); a tension spring (28) is fixedly connected to the outer wall of the support rod (27); and the tension spring (28) is sleeved and installed on the outer wall of the spring sleeve column (29).

3. The low torque high sealing gate valve according to claim 1, characterized in that: Two connecting flanges (11) are arranged on both sides of the valve body (1), a handle (14) is fixedly connected to the top of the valve stem (13), and two isolation plates (15) are arranged on both sides of the inside of the valve body (1).

4. The low torque high sealing gate valve according to claim 2, characterized in that: The valve core assembly (3) comprises a valve core (31), and the two spring sleeve columns (29) are fixedly mounted on both sides above the valve core (31).

5. The low torque high sealing gate valve according to claim 4, characterized in that: A valve stem (13) is movably mounted inside the valve core (31), and a plurality of sealing strips (311) are provided on the outer walls on both sides of the valve core (31), and the plurality of sealing strips (311) are sealed against the outer wall of the isolation plate (15).

6. The low torque high sealing gate valve according to claim 5, characterized in that: A connector (32) is fixedly mounted on the outer wall of the lower end of the valve stem (13), a valve plate (33) is fixedly connected to the outer wall of the connector (32), and the valve plate (33) is arranged in a water through hole opened in the valve core (31).

7. The low torque high sealing gate valve according to claim 6, characterized in that: A limit seat (34) is fixedly mounted on the outer wall of the valve core (31), a limit rod (35) is movably mounted inside the limit seat (34), and the limit rod (35) is fixedly mounted on the outer wall of the valve core (31).

8. The low torque high sealing gate valve according to claim 7, characterized in that: The outer wall of the valve core (31) is provided with a magnetic block (36), and the outer wall of the valve core (31) is provided with a limiting magnetic plate (37), and the magnetic block (36) and the limiting magnetic plate (37) attract each other.

9. The low torque high sealing gate valve according to claim 8, characterized in that: The outer wall of the valve core (31) is provided with a sealing ring (38), and the outer wall of the sealing ring (38) is provided with a fixing plate (39). The fixing plate (39) is fixedly mounted on the outer wall of the valve core (31) via a fixing rod (310), and the sealing ring (38) is in sealing contact with the valve plate (33) when the valve plate (33) is in a closed state.

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