Ultrahigh pressure check valve

Abstract

The invention discloses an ultrahigh pressure check valve, and relates to the technical field of check valves. A flow guide assembly is arranged in the body assembly, a connecting assembly is arranged at one end of the body assembly, a fixing assembly is arranged at the bottom of the connecting assembly, and a non-return assembly is arranged in the fixing assembly. The flow guide assembly comprises a flow guide plate and a rotating shaft, the side face of the flow guide plate and the interior of the body assembly are fixedly installed, the side face of the rotating shaft and the interior of the body assembly are rotationally installed, the surface of the rotating shaft is sleeved with a torsional spring, the side face of the rotating shaft is fixedly connected with a connecting rod, and a valve clack is fixedly installed at one end of the connecting rod. The flow guide assembly is more stable in the preliminary reverse flow prevention process and more stable in use, the situation that the valve clack is broken when the valve clack is impacted by ultrahigh pressure is avoided, the non-return effect is better, double non-return is arranged, the non-return effect on high-pressure fluid is better, and non-return is more stable and reliable when the flow guide assembly is applied to ultrahigh pressure.

Description

Technical Field

[0001] The present invention relates to the technical field of check valves, and in particular to an ultra-high pressure check valve. Background Art

[0002] A check valve refers to a valve in which the opening and closing member is a circular valve flap and which blocks the reverse flow of the medium by its own weight and the action of the medium pressure. It belongs to the category of automatic valves and is also called a non-return valve, a one-way valve, a reflux valve or an isolation valve. The medium flows in from the inlet end and out from the outlet end. When the inlet pressure is greater than the sum of the valve flap weight and its flow resistance, the valve is opened. Conversely, when the medium flows backward, the valve closes. Usually, this kind of valve works automatically. Under the action of the fluid pressure flowing in one direction, the valve flap opens; when the fluid flows in the reverse direction, the valve flap and the self-weight of the valve flap act on the valve seat under the action of the fluid pressure, thereby cutting off the flow.

[0003] Chinese Patent Publication No. CN212657295U discloses an integrally forged ultra-high pressure full-bore swing check valve, which includes a straight-through valve body. A valve seat and a valve flap formed by forging are arranged in the valve body, and the valve seat is parallel to the flange; a valve core is placed in the inner cavity of the valve body, and a cover plate is fixed at the upper end of the valve body; a valve seat is arranged at the inlet of the inner cavity of the valve body, and a valve seat platform is arranged on the valve seat. The valve seat platform is fixedly connected with a hinge shaft through a set screw; one end of the hinge shaft is connected with a rocker, and the other end of the rocker is connected with the valve flap through a nut. The valve flap and the rocker can rotate around the hinge shaft, and the valve flap is opened and closed through the flow of the medium. The middle cavity of the check valve of the present invention adopts a self-sealing structure, and all other parts are installed from the middle cavity.

[0004] However, the existing device has the following problems:

[0005] During the reverse check through the cooperation of the rocker and the valve flap, the stability is poor during the reverse check process. Moreover, during the flow of ultra-high pressure fluid, the impact on the valve flap causes the valve flap to suddenly lift and impact the inside of the valve body, which easily causes the valve flap to break and be damaged. The stability during the reverse check process is poor, and the application effect for ultra-high pressure check is not good. Summary of the Invention

[0006] (1) Technical Problems to be Solved

[0007] Aiming at the deficiencies of the prior art, the present invention provides an ultra-high pressure check valve, which has advantages such as multiple reverse checks, and solves the problem of valve flap fracture caused by sudden high-pressure impact.

[0008] (2) Technical Solutions

[0009] To achieve the above object, the present invention provides the following technical solution: An ultra-high pressure check valve, including a body assembly;

[0010] Inside the body component, a flow guiding component is provided. One end of the body component is provided with a connecting component, the bottom of the connecting component is provided with a fixing component, and a check component is provided inside the fixing component;

[0011] The flow guiding component includes a flow guiding plate and a rotating shaft. The side of the flow guiding plate is fixedly installed inside the body component, the side of the rotating shaft is rotatably installed inside the body component, a torsion spring is sleeved on the surface of the rotating shaft, a connecting rod is fixedly connected to the side of the rotating shaft, a valve flap is fixedly installed at one end of the connecting rod, and through grooves are provided inside both the flow guiding plate and the valve flap;

[0012] The check component includes a check block. The top of the check block is in contact connection with the inside of the fixing component. A rubber pad is fitted on the side of the check block. A check rod is fixedly connected to the bottom of the check block. The side of the check rod is slidably connected to the inside of the fixing component. A spring is fixedly connected to the bottom of the check rod.

[0013] Preferably, the body component includes a valve body. A cover plate is fixedly installed on the top of the valve body, and fixing bolts are fixedly installed inside the cover plate and the valve body.

[0014] Preferably, a limiting component is provided on the top of the body component, and a locking component is provided on the side of the body component.

[0015] Preferably, the limiting component includes a slider. The side of the slider is slidably connected to the inside of the cover plate. The top of the slider is rotatably connected to the top of a first threaded rod. The surface of the first threaded rod is threadedly connected to the inside of the cover plate.

[0016] Preferably, the locking component includes a locking ring. The inside of the locking ring is fixedly installed on the side of the valve body. One end of the locking ring is hinged to a second threaded rod. A locking block is threadedly connected to the surface of the second threaded rod.

[0017] Preferably, the connecting component includes a connecting body. One end of the connecting body is fixedly installed at one end of the valve body. Locking bolts are fixedly installed inside the connecting body and the valve body. A connecting cover is fixedly installed on the top of the connecting body. Connecting bolts are fixedly installed inside the connecting body and the connecting cover.

[0018] Preferably, a driving component is provided inside the connecting component, and a flow stopping component is provided at the bottom of the driving component.

[0019] Preferably, the driving component includes a third threaded rod. The surface of the third threaded rod is threadedly connected to the inside of the connecting cover. The top of the third threaded rod is fixedly connected to a turntable.

[0020] Preferably, the flow-stop assembly includes a flow-stop support and a flow-stop block. The side surface of the flow-stop support is fixedly connected to the inside of the connecting body, and the top of the flow-stop block is fixedly connected to the bottom of the third threaded rod.

[0021] Preferably, the fixing assembly includes a fixing body. The top of the fixing body is fixedly connected to the bottom of the connecting body. A fixing plate is fixedly installed at the bottom of the fixing body, and a flow-through hole is formed inside the fixing plate.

[0022] (III) Beneficial effects

[0023] Compared with the prior art, the present invention provides an ultra-high pressure check valve, which has the following beneficial effects:

[0024] 1. For this ultra-high pressure check valve, the flow guide plate is fixed inside the valve body. Since the holes and grooves of the valve flap and the flow guide plate are arranged in a staggered manner, when high-pressure fluid impacts the valve flap through the holes and grooves inside the flow guide plate, at this time, the valve flap drives the connecting rod to rotate, and the connecting rod drives the torsion spring to rotate along the rotation shaft, enabling the valve flap to open. Due to the relatively large pressure of the high-pressure fluid, while impacting the valve flap to open, the high-pressure fluid flows and relieves pressure in the holes and grooves inside the valve flap. Furthermore, the flow guide assembly is more stable in the initial process of preventing backflow, and is more stable during use, avoiding the fracture of the valve flap when impacted by ultra-high pressure, and having a better check effect.

[0025] 2. For this ultra-high pressure check valve, when high-pressure fluid impacts the check block inside the fixing body, the check block can drive the check rod to slide inside the fixing plate, and the check rod compresses the spring, enabling the fluid to flow on the side of the check block, so that the fluid flows through the fixing plate. When the high-pressure fluid flows backward, it impacts the check block in the reverse direction, causing the check block to cooperate with the rubber pad to move backward and block the fixing body, thereby achieving a stable check effect. Moreover, with double check settings, the check effect on high-pressure fluid is better, and it is more stable and reliable when applied to ultra-high pressure check. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic diagram of the overall structure of an ultra-high pressure check valve proposed by the present invention;

[0027] Figure 2 is a schematic diagram of the body assembly structure of an ultra-high pressure check valve proposed by the present invention;

[0028] Figure 3 is a schematic diagram of the limit assembly structure of an ultra-high pressure check valve proposed by the present invention;

[0029] Figure 4 is a schematic diagram of the flow guide assembly structure of an ultra-high pressure check valve proposed by the present invention;

[0030] Figure 5 is a schematic diagram of the locking assembly structure of an ultra-high pressure check valve proposed by the present invention;

[0031] Figure 6 Schematic diagram of the flow - stopping component structure of a super - high - pressure check valve proposed by the present invention;

[0032] Figure 7 Schematic diagram of the fixing component structure of a super - high - pressure check valve proposed by the present invention;

[0033] Figure 8 Schematic diagram of the non - return component structure of a super - high - pressure check valve proposed by the present invention.

[0034] In the figure: 1. Body component; 101. Valve body; 102. Cover plate; 103. Fixing bolt; 2. Flow - guiding component; 201. Flow - guiding plate; 202. Rotating shaft; 203. Torsion spring; 204. Link; 205. Valve flap; 206. Hole groove; 3. Limiting component; 301. Slide block; 302. First threaded rod; 4. Locking component; 401. Locking ring; 402. Second threaded rod; 403. Locking block; 5. Connecting component; 501. Connecting body; 502. Locking bolt; 503. Connecting cover; 504. Connecting bolt; 6. Driving component; 601. Third threaded rod; 602. Turntable; 7. Flow - stopping component; 701. Flow - stopping support; 702. Flow - stopping block; 8. Fixing component; 801. Fixing body; 802. Fixing plate; 803. Flow - through hole; 9. Non - return component; 901. Non - return block; 902. Rubber pad; 903. Non - return rod; 904. Spring. Detailed implementation manners

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0036] Please refer to Figures 1 to 8 , the embodiments of the present invention provide a super - high - pressure check valve, which is applied to the scenario of using a one - way flow valve. In this embodiment, by improving the structure of the super - high - pressure check, it has the advantage of stable super - high - pressure check. Specifically, taking the super - high - pressure check as an example, as a preferred solution in this embodiment, the super - high - pressure check is specifically a super - high - pressure check valve, which can achieve multiple stable check effects on super - high - pressure.

[0037] Please refer to Figures 1 to 8 , the present invention provides a technical solution: a super - high - pressure check valve, which is mainly applied to the scenario of using a one - way flow valve.

[0038] Inside the body component 1, a flow guiding component 2 is provided. At the top of the body component 1, a limiting component 3 is provided. On the side of the body component 1, a locking component 4 is provided. At one end of the body component 1, a connecting component 5 is provided. Inside the connecting component 5, a driving component 6 is provided. At the bottom of the driving component 6, a flow stopping component 7 is provided. At the bottom of the connecting component 5, a fixing component 8 is provided. Inside the fixing component 8, a check component 9 is provided.

[0039] The body component 1 includes a valve body 101. At the top of the valve body 101, a cover plate 102 is fixedly installed. Inside the cover plate 102 and the valve body 101, fixing bolts 103 are fixedly installed. By allowing fluid to enter the inside of the valve body 101 at one end of the valve body 101, and fixing the cover plate 102 to the top of the valve body 101 through the fixing bolts 103, a sealed environment is formed inside the valve body 101.

[0040] The flow guiding component 2 includes a flow guiding plate 201 and a rotating shaft 202. The side of the flow guiding plate 201 is fixedly installed inside the valve body 101. The side of the rotating shaft 202 is rotatably installed inside the valve body 101. A torsion spring 203 is sleeved on the surface of the rotating shaft 202. The side of the rotating shaft 202 is fixedly connected to a connecting rod 204. One end of the connecting rod 204 is fixedly installed with a valve flap 205. Through holes 206 are opened inside both the flow guiding plate 201 and the valve flap 205. Since the flow guiding plate 201 is fixed inside the valve body 101, and the holes 206 of the valve flap 205 are misaligned with those of the flow guiding plate 201, when high-pressure fluid impacts the valve flap 205 through the holes 206 inside the flow guiding plate 201, at this time the valve flap 205 drives the connecting rod 204 to rotate, and the connecting rod 204 drives the torsion spring 203 to rotate along the rotating shaft 202, enabling the valve flap 205 to open. Due to the relatively large pressure of the high-pressure fluid, while the high-pressure fluid impacts the valve flap 205 to open, the high-pressure fluid flows and relieves pressure inside the holes 206 of the valve flap 205. Furthermore, the flow guiding component 2 is more stable in the initial process of preventing backflow, and is more stable during use, avoiding the fracture of the valve flap 205 when the valve flap 205 is impacted by ultra-high pressure, and having a better check effect.

[0041] The limiting component 3 includes a slider 301. The side of the slider 301 is slidably connected to the inside of the cover plate 102. The top of the slider 301 is rotatably connected to the top of the first threaded rod 302. The surface of the first threaded rod 302 is threadedly connected to the inside of the cover plate 102. By rotating the first threaded rod 302, the first threaded rod 302 can drive the slider 301 to slide inside the cover plate 102 while rotating inside the cover plate 102, thereby restricting the moving range of the valve flap 205, and further restricting the high-pressure flow that impacts the valve flap 205.

[0042] The locking component 4 includes a locking ring 401. The interior of the locking ring 401 is fixedly installed on the side surface of the valve body 101. One end of the locking ring 401 is hingedly connected to a second threaded rod 402. A locking block 403 is threadedly connected to the surface of the second threaded rod 402. After fixedly installing one end of the assembled valve body 101 and the connecting body 501, and the valve body 101 and the connecting body 501 are protected by the locking ring 401. At this time, rotate the second threaded rod 402 to assemble the two locking rings 401, and rotate the locking block 403 to move along the second threaded rod 402, so that the locking block 403 is stably connected to the locking ring 401, making the connection between the valve body 101 and the connecting body 501 more stable.

[0043] The connecting component 5 includes a connecting body 501. One end of the connecting body 501 is fixedly installed on one end of the valve body 101. A locking bolt 502 is fixedly installed inside the connecting body 501 and the valve body 101. A connecting cover 503 is fixedly installed on the top of the connecting body 501. A connecting bolt 504 is fixedly installed inside the connecting body 501 and the connecting cover 503. The connecting cover 503 and the connecting body 501 are fixedly installed by using the connecting bolt 504, and one end of the valve body 101 and the connecting body 501 are fixedly installed by using the locking bolt 502. At this time, the high-pressure fluid enters the inside of the connecting body 501 through the inside of the valve body 101.

[0044] The driving component 6 includes a third threaded rod 601. The surface of the third threaded rod 601 is threadedly connected to the inside of the connecting cover 503. The top of the third threaded rod 601 is fixedly connected to a turntable 602. By rotating the turntable 602, the turntable 602 can drive the third threaded rod 601 fixed at the bottom to rotate. At this time, the third threaded rod 601 moves inside the connecting cover 503, thereby providing stable power for stopping the flow.

[0045] The flow-stopping component 7 includes a flow-stopping support 701 and a flow-stopping block 702. The side surface of the flow-stopping support 701 is fixedly connected to the inside of the connecting body 501. The top of the flow-stopping block 702 is fixedly connected to the bottom of the third threaded rod 601. The movement of the third threaded rod 601 drives the flow-stopping block 702 to rotate and move, so that the flow-stopping block 702 cooperates with the flow-stopping support 701 to control the on-off of the fluid, thereby blocking after high-pressure check valve, and avoiding damage to the high-pressure check valve device due to high-pressure impact.

[0046] The fixing component 8 includes a fixing body 801. The top of the fixing body 801 is fixedly connected to the bottom of the connecting body 501. A fixing disk 802 is fixedly installed at the bottom of the fixing body 801. A flow-through hole 803 is formed inside the fixing disk 802. The high-pressure fluid enters the inside of the fixing body 801 through the connecting body 501, and flows out of the check valve through the fixing body 801 and the fixing disk 802 in the flow-through hole 803.

[0047] The check assembly 9 includes a check block 901. The top of the check block 901 is in contact connection with the inside of the fixed body 801. A rubber pad 902 is fitted and installed on the side of the check block 901. The bottom of the check block 901 is fixedly connected with a check rod 903. The side of the check rod 903 is slidably connected with the inside of the fixed disk 802. The bottom of the check rod 903 is fixedly connected with a spring 904. By the high-pressure fluid impacting the check block 901 inside the fixed body 801, the check block 901 can drive the check rod 903 to slide inside the fixed disk 802, and the check rod 903 compresses the spring 904, enabling the fluid to flow on the side of the check block 901, so that the fluid flows through the fixed disk 802. When the high-pressure fluid flows backward, it impacts the check block 901 in the reverse direction, causing the check block 901 to move backward in cooperation with the rubber pad 902 to block the fixed body 801, thereby achieving a stable check effect. And a double check is set, and the check effect for high-pressure fluid is better, and the check for ultra-high pressure is more stable and reliable.

[0048] In summary, when the ultra-high pressure check valve is in use:

[0049] 1. Rotate the first threaded rod 302. When the first threaded rod 302 rotates inside the cover plate 102, it can drive the slider 301 to slide inside the cover plate 102, thereby restricting the movement range of the valve flap 205, and further restricting the high-pressure flow that impacts the valve flap 205 under high pressure. When the fluid enters the inside of the valve body 101 at one end of the valve body 101, and the cover plate 102 is fixed on the top of the valve body 101 through the fixing bolts 103, a sealed environment is formed inside the valve body 101. After the assembled valve body 101 and one end of the connecting body 501 are fixedly installed, and the valve body 101 and the connecting body 501 are protected by the locking ring 401. At this time, rotate the second threaded rod 402 to assemble the two locking rings 401, and rotate the locking block 403 to move along the second threaded rod 402, so that the locking block 403 is stably connected with the locking ring 401, making the connection between the valve body 101 and the connecting body 501 more stable;

[0050] 2. The flow guide plate 201 is fixed inside the valve body 101. Since the valve flap 205 is misaligned with the hole groove 206 of the flow guide plate 201, when the high-pressure fluid impacts the valve flap 205 through the hole groove 206 inside the flow guide plate 201, at this time, the valve flap 205 drives the connecting rod 204 to rotate, and the connecting rod 204 drives the torsion spring 203 to rotate along the rotating shaft 202, enabling the valve flap 205 to open. Since the pressure of the high-pressure fluid is relatively large, while the valve flap 205 is impacted and opened, the high-pressure fluid flows and relieves pressure in the hole groove 206 inside the valve flap 205, making the flow guide assembly 2 more stable in the process of initially preventing backflow, and more stable during use, avoiding the fracture of the valve flap 205 when the ultra-high pressure impacts the valve flap 205, and having a better check effect;

[0051] 3. Use the connecting bolt 504 to fixedly install the connecting cover 503 and the connecting body 501, and use the locking bolt 502 to fixedly install one end of the valve body 101 and the connecting body 501. At this time, the high-pressure fluid enters the inside of the connecting body 501 through the inside of the valve body 101. The high-pressure fluid enters the inside of the fixed body 801 through the connecting body 501, and flows out of the check valve through the fixed body 801 and the fixed disk 802 at the flow-through hole 803.

[0052] 4. The high-pressure fluid impacts the check block 901 inside the fixed body 801, which can cause the check block 901 to drive the check rod 903 to slide inside the fixed disk 802, and the check rod 903 compresses the spring 904, so that the fluid flows on the side of the check block 901. Thus, the fluid flows through the fixed disk 802. When the high-pressure fluid flows backward, it impacts the check block 901 in the reverse direction, so that the check block 901 cooperates with the rubber pad 902 to move backward to block the fixed body 801, thereby achieving a stable check effect. And a double check is set, which has a better check effect on the high-pressure fluid, and is more stable and reliable for the check of ultra-high pressure.

[0053] 5. Rotate the turntable 602, which can cause the turntable 602 to drive the third threaded rod 601 fixed at the bottom to rotate. At this time, the third threaded rod 601 moves inside the connecting cover 503, thereby providing stable power for stopping the flow. The movement of the third threaded rod 601 drives the flow-stop block 702 to rotate and move, so that the flow-stop block 702 cooperates with the flow-stop support 701 to control the on-off of the fluid, and thus blocks the fluid after the high-pressure check, avoiding damage to the check device caused by high-pressure impact.

[0054] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one" does not exclude the presence of additional identical elements in the process, method, article or device including the element.

[0055] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A super high-pressure check valve, characterized in that, It includes a body component (1); Among them, a diversion component (2) is arranged inside the body component (1), a connection component (5) is arranged at one end of the body component (1), a fixing component (8) is arranged at the bottom of the connection component (5), and a check component (9) is arranged inside the fixing component (8); The diversion component (2) includes a diversion plate (201) and a rotating shaft (202). The side of the diversion plate (201) is fixedly installed inside the body component (1), the side of the rotating shaft (202) is rotatably installed inside the body component (1). A torsion spring (203) is sleeved on the surface of the rotating shaft (202). One side of the rotating shaft (202) is fixedly connected with a connecting rod (204), and a valve flap (205) is fixedly installed at one end of the connecting rod (204). Hole grooves (206) are formed inside both the diversion plate (201) and the valve flap (205); The check component (9) includes a check block (901). The top of the check block (901) is in contact connection with the inside of the fixing component (8). A rubber pad (902) is fitted on the side of the check block (901). The bottom of the check block (901) is fixedly connected with a check rod (903). The side of the check rod (903) is slidably connected with the inside of the fixing component (8). A spring (904) is fixedly connected to the bottom of the check rod (903).

2. The ultra-high pressure check valve according to claim 1, characterized in that: The body component (1) includes a valve body (101). A cover plate (102) is fixedly installed on the top of the valve body (101), and fixing bolts (103) are fixedly installed inside the cover plate (102) and the valve body (101).

3. The ultra-high pressure check valve according to claim 2, wherein: A limiting component (3) is arranged on the top of the body component (1), and a locking component (4) is arranged on the side of the body component (1).

4. The ultra-high pressure check valve according to claim 3, characterized in that: The limiting component (3) includes a slider (301). The side of the slider (301) is slidably connected with the inside of the cover plate (102). The top of the slider (301) is rotatably connected with the top of a first threaded rod (302). The surface of the first threaded rod (302) is threadedly connected with the inside of the cover plate (102).

5. The ultra-high pressure check valve according to claim 3, characterized in that: The locking component (4) includes a locking ring (401). The inside of the locking ring (401) is fixedly installed on the side of the valve body (101). One end of the locking ring (401) is hinge-connected with a second threaded rod (402). A locking block (403) is threadedly connected to the surface of the second threaded rod (402).

6. The ultra-high pressure check valve according to claim 2, wherein: The connection component (5) includes a connection body (501). One end of the connection body (501) is fixedly installed on one end of the valve body (101). Locking bolts (502) are fixedly installed inside the connection body (501) and the valve body (101). A connection cover (503) is fixedly installed on the top of the connection body (501). Connection bolts (504) are fixedly installed inside the connection body (501) and the connection cover (503).

7. The ultra-high pressure check valve according to claim 6, characterized in that: A driving component (6) is arranged inside the connection component (5), and a flow-stop component (7) is arranged at the bottom of the driving component (6).

8. The ultra-high pressure check valve according to claim 7, characterized in that: The driving component (6) includes a third threaded rod (601), the surface of the third threaded rod (601) is threadedly connected to the inside of the connection cover (503), and the top of the third threaded rod (601) is fixedly connected to a turntable (602).

9. The ultra-high pressure check valve according to claim 7, characterized in that: The flow-stopping component (7) includes a flow-stopping support (701) and a flow-stopping block (702). The side of the flow-stopping support (701) is fixedly connected to the inside of the connection body (501), and the top of the flow-stopping block (702) is fixedly connected to the bottom of the third threaded rod (601).

10. A super high-pressure check valve according to claim 6, characterized in that: The fixing component (8) includes a fixing body (801). The top of the fixing body (801) is fixedly connected to the bottom of the connection body (501). A fixing disk (802) is fixedly installed at the bottom of the fixing body (801), and a circulation hole (803) is formed inside the fixing disk (802).

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