Temperature sensing type reversing valve

Abstract

The invention belongs to the technical field of reversing valves, and discloses a temperature sensing type reversing valve which comprises a temperature sensing reversing valve body, a valve element is arranged in the temperature sensing reversing valve body, and an input port is fixedly connected to the top of the temperature sensing reversing valve body. Through cooperation of a sealing assembly, a moving assembly, a moving plate and other structures, harm caused by water hammer benefits is reduced, a limiting block is extruded by pressure waves to move towards the sealing assembly, so that a protruding block slides in a first guide groove and drives a cylindrical cam to rotate, and after the cylindrical cam rotates by 90 degrees, the cylindrical cam is driven to rotate by 90 degrees. When the water hammer works, the air outlet is driven to release sealing of the air tank, then pressure waves extrude the movable plate to move towards the sealing assembly, air in the air tank is extruded to be discharged outwards through the circular groove, part of pressure energy is absorbed while the air is discharged, a certain buffering effect is achieved on the interior of the exhaust port, and then harm caused by water hammer benefits is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of reversing valves, in particular to a temperature-sensing reversing valve. Background Art

[0002] A reversing valve, also known as a directional control valve, is a valve used to control the flow direction of a fluid medium. It can realize various flow control functions such as forward, reverse, and stop of the fluid in the pipeline. Reversing valves are widely used in hydraulic systems, pneumatic systems, engineering machinery, heavy machinery, ships and other fields. It is one of the important components for realizing hydraulic transmission and pneumatic transmission.

[0003] For example, the utility model with the publication number CN216479063U provides a reversing valve, which includes a cylinder, a plurality of connecting pipes and a piston. The wall thickness of the cylinder is H1, H1=28mm~50mm; the plurality of connecting pipes are respectively connected to the cylinder, and the plurality of connecting pipes are used to connect with the pipeline outside the reversing valve, wherein the wall thickness of the connecting pipe with the thickest wall thickness is H2, H1≥2H2; the piston is slidably arranged in the cylinder to switch the connection state of different connecting pipes. In this scheme, the wall thickness of the cylinder is set to at least twice the wall thickness of the connecting pipe, and the value of H1 is limited to 28mm~50mm, so that the wall thickness of the cylinder is relatively thick. When the connecting pipe is welded to the external pipeline, when the welding stress acts on the cylinder, the cylinder has sufficient anti-deformation ability to ensure the internal size of the cylinder, which can effectively prevent the problem of the internal piston being stuck due to the tensile stress deformation of the cylinder;

[0004] When the above device is in use, the thickness of the cylinder and the connection of the pipeline are designed to prevent the internal piston from getting stuck due to deformation of the cylinder during use of the reversing valve. However, when the above device is in use, if the valve is suddenly closed, the water will continue to flow forward under the action of inertia, thereby forming a water hammer effect in the pipeline. Severe water hammer effect may cause pipeline rupture, deformation, and even cracks and leakage, thereby increasing energy costs. Therefore, a temperature-sensing reversing valve is proposed to solve the problems raised in the background technology. Summary of the invention

[0005] In order to solve the problem in the above background technology that the pressure wave caused by the water hammer effect cannot be buffered, thereby causing pipeline rupture or deformation, the present invention provides a temperature-sensitive reversing valve.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a temperature-sensing reversing valve, comprising a temperature-sensing reversing valve body, a valve core is arranged inside the temperature-sensing reversing valve body, an input port is fixedly connected to the top of the temperature-sensing reversing valve body, two exhaust ports are arranged at the bottom of the temperature-sensing reversing valve body, an air tank connected to the exhaust port is fixedly connected to the outer wall of the exhaust port, a sealing assembly is arranged at one end of the air tank away from the exhaust port, a moving assembly is arranged at an annular angle of 180 degrees inside the air tank, a spring rod is fixedly connected to the inside of the air tank, a moving plate is fixedly connected to one end of the spring rod away from the sealing assembly, a first connecting rod is hinged to one end of the moving plate away from the spring rod, a second connecting rod is hinged to the bottom of the first connecting rod, a limiting plate is fixedly connected to the bottom of the second connecting rod, a round rod is fixedly connected to the middle of the limiting plate, a pipeline assembly is fixedly connected to the bottom of the exhaust port, and a temperature sensor is arranged on the outer wall of the temperature-sensing reversing valve body;

[0007] Wherein, the sealing assembly comprises a cylindrical cam movably connected to the air tank, and a first guide groove is formed on the inner wall of the cylindrical cam at an angle of 180 degrees;

[0008] The moving assembly comprises a limit block, one end of the limit block away from the exhaust port is fixedly connected with a spring sheet, and the spring sheet is fixed in the air tank.

[0009] Preferably, an air outlet hole is opened at the top of the cylindrical cam, the diameter of the air outlet hole is the same as the diameter of the circular groove, the cylindrical cam seals the circular groove in the initial state, and the arc of the first guide groove is ninety degrees.

[0010] Preferably, a protrusion is provided on the opposite side of the two limit blocks, and the protrusion is movably engaged inside the first guide groove. The spring sheet is used to squeeze the limit block and keep the limit block moving toward the exhaust port. The limit block is L-shaped, and the bottom end of the limit block passes through the inner wall of the air tank and extends into the cavity inside the air tank.

[0011] Preferably, when the limit block moves toward the sealing assembly, the protrusion slides along the track of the first guide groove. After the protrusion slides, it drives the cylindrical cam to rotate ninety degrees. After the cylindrical cam rotates ninety degrees, it drives the air outlet to coincide with the circular groove and releases the seal of the air tank.

[0012] Preferably, the spring rod is divided into a rod body and a spring sleeved outside the rod body, two ends of the spring are fixedly connected to the air tank and the movable plate respectively, and the outer wall of the movable plate is in contact with the inner wall of the air tank.

[0013] Preferably, the pipe assembly includes a first pipe fixedly connected to the exhaust port, a second pipe is fixedly connected to the interior of the first pipe, an outer wall of the second pipe fits with the inner wall of the exhaust port, and a baffle is provided at a 180-degree inner ring of the second pipe.

[0014] Preferably, a square groove is provided in a 180-degree circular shape on the surface of the second pipe, the baffle is in an arc shape, the baffle seals the square groove in an initial state, and a second guide groove is provided on the inner wall of the baffle.

[0015] Preferably, the inner wall of the second pipe is provided with a limiting groove cooperating with the limiting plate, the limiting groove is used for circumferentially limiting the limiting plate when the baffle rotates, the second guide groove is seventy degrees, and the two ends of the round rod are respectively clamped in the inside of the two second guide grooves.

[0016] Preferably, when the movable plate moves toward the sealing assembly, the first connecting rod drives the second connecting rod to move upward, and when the second connecting rod moves upward, the limiting plate drives the round rod to move upward.

[0017] Preferably, when the round rod moves upward, it drives the baffle to rotate seventy degrees clockwise through the second guide groove. After rotating seventy degrees, the baffle shrinks to the inside of the second pipe and releases the seal of the square groove on the surface of the second pipe.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The present invention reduces the harm caused by water hammer effect by arranging the cooperation of the sealing component, the moving component and the moving plate. The pressure wave squeezes the limit block to move toward the sealing component, so that the protrusion slides inside the first guide groove and drives the cylindrical cam to rotate. When the cylindrical cam rotates ninety degrees, it drives the air outlet to release the seal of the air tank. Then, the pressure wave squeezes the moving plate to move toward the sealing component, thereby squeezing the air inside the air tank to be discharged to the outside through the circular groove. While the air is discharged, a part of the pressure energy is absorbed, thereby playing a certain buffering role on the inside of the exhaust port, thereby reducing the harm caused by water hammer effect.

[0020] The present invention further reduces the impact of water hammer pressure by arranging the cooperation of structures such as round rods and pipeline components, thereby improving the overall stability of the device. Through the cooperation of the movable plate and the first connecting rod, the movable plate drives the second connecting rod and the limit plate at its bottom to move up when it moves. When the limit plate moves up, the two ends of the round rod are driven to slide along the trajectories of the two second guide grooves respectively, so that the baffle rotates seventy degrees clockwise, and then the baffle shrinks to the inside of the second pipe and releases the seal of the square groove. Subsequently, the water flow in the second pipe flows into the inside of the first pipe through the square groove, so that the pressure wave energy is dispersed more widely and the impact force on the exhaust port is reduced, thereby improving the overall stability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 It is a schematic diagram of the front cross-section structure of the present invention;

[0023] Figure 3 An exploded view of the sealing assembly of the present invention;

[0024] Figure 4 It is an enlarged cross-sectional view of the exhaust port of the present invention;

[0025] Figure 5 for Figure 4 Enlarged view of point A in the middle;

[0026] Figure 6 for Figure 4 Enlarged view of point B in the middle;

[0027] Figure 7 It is a schematic diagram of the top cross-sectional structure of the second pipeline of the present invention;

[0028] Figure 8 It is a schematic diagram of the positional relationship between the baffle and the round rod of the present invention.

[0029] In the figure: 1. temperature sensing reversing valve body; 2. valve core; 3. input port; 4. exhaust port; 5. air tank; 6. sealing assembly; 601. cylindrical cam; 602. first guide groove; 603. air outlet; 7. moving assembly; 701. limit block; 702. bump; 703. spring piece; 8. round groove; 9. spring rod; 10. moving plate; 11. first connecting rod; 12. second connecting rod; 13. limit plate; 14. round rod; 15. pipeline assembly; 1501. first pipeline; 1502. second pipeline; 1503. baffle; 1504. second guide groove; 1505. limit groove; 16. temperature sensor. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions 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 of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] like Figures 1 to 8 As shown, the present invention provides a temperature sensing reversing valve, comprising a temperature sensing reversing valve body 1, a valve core 2 is arranged inside the temperature sensing reversing valve body 1, an input port 3 is fixedly connected to the top of the temperature sensing reversing valve body 1, two exhaust ports 4 are arranged at the bottom of the temperature sensing reversing valve body 1, an air tank 5 connected to the exhaust port 4 is fixedly connected to the outer wall of the exhaust port 4, a sealing assembly 6 is arranged at one end of the air tank 5 away from the exhaust port 4, a moving assembly 7 is arranged in an annular manner of 180 degrees inside the air tank 5, a spring rod 9 is fixedly connected to the inside of the air tank 5, a moving plate 10 is fixedly connected to one end of the spring rod 9 away from the sealing assembly 6, a first connecting rod 11 is hinged to one end of the moving plate 10 away from the spring rod 9, a second connecting rod 12 is hinged to the bottom of the first connecting rod 11, a limiting plate 13 is fixedly connected to the bottom of the second connecting rod 12, a round rod 14 is fixedly connected to the middle of the limiting plate 13, a pipeline assembly 15 is fixedly connected to the bottom of the exhaust port 4, and a temperature sensor 16 is arranged on the outer wall of the temperature sensing reversing valve body 1;

[0032] The sealing assembly 6 comprises a cylindrical cam 601 movably connected to the air tank 5, and a first guide groove 602 is formed on the inner wall of the cylindrical cam 601 at an angle of 180 degrees.

[0033] The moving assembly 7 comprises a limit block 701 , and one end of the limit block 701 away from the exhaust port 4 is fixedly connected to a spring piece 703 , and the spring piece 703 is fixedly connected in the air tank 5 .

[0034] The above scheme is adopted: the pressure wave squeezes the limit block 701 to move toward the sealing component 6, so that the protrusion 702 slides inside the first guide groove 602 and drives the cylindrical cam 601 to rotate. When the cylindrical cam 601 rotates ninety degrees, it drives the air outlet 603 to release the seal of the air tank 5. Then the pressure wave squeezes the moving plate 10 to move toward the sealing component 6, thereby squeezing the air inside the air tank 5 to be discharged to the outside through the circular groove 8. While the air is discharged, a part of the pressure energy is absorbed, thereby playing a certain buffering role on the inside of the exhaust port 4, thereby reducing the harm caused by the water hammer effect.

[0035] like Figures 1 to 5As shown, an air outlet hole 603 is provided at the top of the cylindrical cam 601, and the diameter of the air outlet hole 603 is the same as the diameter of the circular groove 8. The cylindrical cam 601 seals the circular groove 8 in the initial state. The arc of the first guide groove 602 is ninety degrees. The two limit blocks 701 are provided with protrusions 702 on the opposite sides. The protrusions 702 are movably connected to the inside of the first guide groove 602. The spring piece 703 is used to squeeze the limit block 701 and keep the limit block 701 moving toward the exhaust port 4. The limit block 701 is L-shaped, and the bottom end of the limit block 701 passes through the inner wall of the air tank 5 and extends into the cavity inside the air tank 5.

[0036] The above scheme is adopted: the limit block 701 is squeezed by the spring piece 703 to move toward the exhaust port 4. Its function is that when the water hammer effect is alleviated, the limit block 701 moves toward the exhaust port 4 under the action of the elastic force of the spring piece 703. While the limit block 701 moves, the protrusion 702 slides along the trajectory of the first guide groove 602, thereby driving the cylindrical cam 601 to rotate ninety degrees in the opposite direction, and then the cylindrical cam 601 seals the circular groove 8. At the same time, the limit block 701 is reset, which is convenient for the next operation, thereby ensuring the normal use of the device.

[0037] like Figures 1 to 5 As shown, when the limit block 701 moves toward the sealing assembly 6, the protrusion 702 slides along the trajectory of the first guide groove 602. After the protrusion 702 slides, it drives the cylindrical cam 601 to rotate ninety degrees. After the cylindrical cam 601 rotates ninety degrees, it drives the air outlet 603 to coincide with the circular groove 8, and releases the seal of the air tank 5. The spring rod 9 is divided into a rod body and a spring sleeved on the outside thereof. The two ends of the spring are fixedly connected to the air tank 5 and the movable plate 10 respectively, and the outer wall of the movable plate 10 fits with the inner wall of the air tank 5.

[0038] The above scheme is adopted: through the design of the spring rod 9, its function is that when the water hammer effect is alleviated, the movable plate 10 moves toward the exhaust port 4 under the action of the elastic force of the spring rod 9. When the movable plate 10 moves, the external air is sucked into the inner cavity of the air tank 5 through the circular groove 8, thereby ensuring the safe and stable operation of the device.

[0039] like Figure 2 , Figure 4 , Figures 6 to 8As shown, the pipeline assembly 15 includes a first pipeline 1501 fixedly connected to the exhaust port 4, a second pipeline 1502 is fixedly connected inside the first pipeline 1501, the outer wall of the second pipeline 1502 fits with the inner wall of the exhaust port 4, a baffle 1503 is provided in an inner ring of the second pipeline 1502 at an angle of 180 degrees, a square groove is provided in an inner ring of the second pipeline 1502 at an angle of 180 degrees, the baffle 1503 is in an arc shape, and the baffle 1503 seals the square groove in the initial state, a second guide groove 1504 is provided on the inner wall of the baffle 1503, and a limiting groove 1505 cooperating with the limiting plate 13 is provided on the inner wall of the second pipeline 1502, the limiting groove 1505 is used for the circumferential limitation of the limiting plate 13 by the baffle 1503 when rotating, the second guide groove 1504 is 70 degrees, and the two ends of the round rod 14 are respectively clamped in the inside of the two second guide grooves 1504.

[0040] The above scheme is adopted: the square groove is sealed by the baffle 1503 in the initial state. Its function is that when the valve is opened normally, the water flows normally inside the second pipe 1502, thereby meeting the water demand under normal working conditions. The resistance inside the second pipe 1502 is small, so a certain flow rate and flow velocity can be guaranteed.

[0041] like Figures 2 to 4 , Figures 6 to 8 As shown, when the movable plate 10 moves toward the sealing assembly 6, the second connecting rod 12 is driven to move upward through the first connecting rod 11. When the second connecting rod 12 moves upward, the round rod 14 is driven to move upward through the limiting plate 13. When the round rod 14 moves upward, the baffle 1503 is driven to rotate seventy degrees clockwise through the second guide groove 1504. After rotating seventy degrees, the baffle 1503 shrinks to the inside of the second pipe 1502 and releases the seal of the square groove on the surface of the second pipe 1502.

[0042] The above scheme is adopted: through the cooperation between the movable plate 10 and the first connecting rod 11, the movable plate 10 drives the second connecting rod 12 and the limit plate 13 at the bottom thereof to move upward when it moves. When the limit plate 13 moves upward, the two ends of the round rod 14 are driven to slide along the trajectories of the two second guide grooves 1504 respectively, so that the baffle 1503 rotates seventy degrees clockwise, and then the baffle 1503 shrinks to the inside of the second pipe 1502, and the seal of the square groove is released. Then the water flow inside the second pipe 1502 flows into the inside of the first pipe 1501 through the square groove, so that the pressure wave energy is dispersed more widely, and the impact force on the exhaust port 4 is reduced, thereby improving the overall stability of the device.

[0043] The working principle and use process of the present invention are as follows: when the valve is suddenly closed, the water flow inside the exhaust port 4 continues to flow under the action of inertia, thereby generating a water hammer effect, and then the water hammer pressure wave is transmitted to the inside of the air tank 5, so that the air tank 5 squeezes the limit block 701 to move in the direction of the sealing component 6. While the limit block 701 moves, it drives the protrusion 702 to slide along the trajectory of the first guide groove 602, so that the cylindrical cam 601 rotates. When the protrusion 702 slides to the top of the first guide groove 602, the cylindrical cam 601 rotates ninety degrees, thereby driving the air outlet 603 to overlap with the circular groove 8, thereby releasing the seal on the top of the air tank 5, and then the water hammer pressure wave pushes the moving plate 10 to move in the direction of the sealing component 6. While the moving plate 10 moves, the air squeezed inside the air tank 5 is discharged to the outside through the circular groove 8. While the air is discharged, it absorbs part of the pressure energy brought by the water hammer effect, thereby reducing the intensity of the pressure wave, thereby playing a buffering role for the exhaust port 4.

[0044] When the movable plate 10 moves toward the sealing assembly 6, the second connecting rod 12 and the limiting plate 13 at the bottom thereof are driven to move upward through the first connecting rod 11. When the limiting plate 13 moves upward, the two ends of the round rod 14 are driven to slide along the trajectories of the two second guide grooves 1504 respectively, so that the baffle 1503 rotates clockwise. When the round rod 14 slides to the top of the second guide groove 1504, the baffle 1503 rotates seventy degrees, thereby shrinking to the inside of the second pipe 1502, thereby releasing the seal of the square groove on the second pipe 1502, and then the water flow inside the second pipe 1502 flows into the inside of the first pipe 1501 through the square groove, thereby increasing the space for water flow, so that the energy of the pressure wave is dispersed more widely during the propagation process, thereby reducing the impact force on the exhaust port 4 and effectively alleviating the harm caused by the water hammer effect.

[0045] 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.

[0046] 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 temperature-sensitive reversing valve, comprising a temperature-sensitive reversing valve body (1), characterized in that: The temperature sensing reversing valve body (1) is provided with a valve core (2) inside, the top of the temperature sensing reversing valve body (1) is fixedly connected with an input port (3), the bottom of the temperature sensing reversing valve body (1) is provided with two exhaust ports (4), the outer wall of the exhaust port (4) is fixedly connected with an air tank (5) connected with the exhaust port (4), the end of the air tank (5) away from the exhaust port (4) is provided with a sealing component (6), the inner ring of the air tank (5) is provided with a moving component (7) at an angle of 180 degrees, and the inner part of the air tank (5) is fixedly connected with a spring rod ( 9), one end of the spring rod (9) away from the sealing assembly (6) is fixedly connected to a movable plate (10), one end of the movable plate (10) away from the spring rod (9) is hinged to a first connecting rod (11), the bottom end of the first connecting rod (11) is hinged to a second connecting rod (12), the bottom of the second connecting rod (12) is fixedly connected to a limiting plate (13), the middle of the limiting plate (13) is fixedly connected to a round rod (14), the bottom of the exhaust port (4) is fixedly connected to a pipeline assembly (15), and the outer wall of the temperature sensing reversing valve body (1) is provided with a temperature sensor (16); The sealing assembly (6) comprises a cylindrical cam (601) movably connected to the air tank (5), and a first guide groove (602) is formed on the inner wall of the cylindrical cam (601) at an angle of 180 degrees; The moving assembly (7) comprises a limit block (701), one end of the limit block (701) away from the exhaust port (4) is fixedly connected to a spring sheet (703), and the spring sheet (703) is fixedly connected to the inside of the air tank (5).

2. The temperature-sensitive reversing valve according to claim 1, characterized in that: An air outlet hole (603) is provided at the top of the cylindrical cam (601), and the diameter of the air outlet hole (603) is the same as the diameter of the circular groove (8). In the initial state, the cylindrical cam (601) seals the circular groove (8), and the arc of the first guide groove (602) is ninety degrees.

3. The temperature-sensitive reversing valve according to claim 1, characterized in that: A protrusion (702) is provided on opposite sides of the two limit blocks (701), and the protrusion (702) is movably engaged in the interior of the first guide groove (602). The spring sheet (703) is used to squeeze the limit block (701) and keep the limit block (701) moving toward the exhaust port (4). The limit block (701) is L-shaped, and the bottom end of the limit block (701) passes through the inner wall of the air tank (5) and extends into the cavity inside the air tank (5).

4. The temperature-sensitive reversing valve according to claim 2, characterized in that: When the limit block (701) moves toward the sealing assembly (6), the protrusion (702) slides along the track of the first guide groove (602). After the protrusion (702) slides, it drives the cylindrical cam (601) to rotate ninety degrees. After the cylindrical cam (601) rotates ninety degrees, it drives the air outlet (603) to overlap with the circular groove (8), thereby releasing the seal of the air tank (5).

5. The temperature-sensitive reversing valve according to claim 1, characterized in that: The spring rod (9) is divided into a rod body and a spring sleeved on the outside thereof, and the two ends of the spring are respectively fixedly connected to the air tank (5) and the movable plate (10), and the outer wall of the movable plate (10) is in contact with the inner wall of the air tank (5).

6. The temperature-sensitive reversing valve according to claim 1, characterized in that: The pipeline assembly (15) comprises a first pipeline (1501) fixedly connected to the exhaust port (4); a second pipeline (1502) is fixedly connected inside the first pipeline (1501); the outer wall of the second pipeline (1502) is in contact with the inner wall of the exhaust port (4); and a baffle (1503) is provided inside the second pipeline (1502) in an annular shape at 180 degrees.

7. The temperature-sensitive reversing valve according to claim 6, characterized in that: The surface of the second pipe (1502) is provided with a square groove in an annular shape of 180 degrees. The baffle (1503) is in an arc shape. The baffle (1503) seals the square groove in an initial state. The inner wall of the baffle (1503) is provided with a second guide groove (1504).

8. The temperature-sensitive reversing valve according to claim 7, characterized in that: The inner wall of the second pipe (1502) is provided with a limiting groove (1505) which cooperates with the limiting plate (13). The limiting groove (1505) is used for the baffle plate (1503) to limit the circumferential position of the limiting plate (13) when rotating. The second guide groove (1504) is seventy degrees, and the two ends of the round rod (14) are respectively clamped in the inside of the two second guide grooves (1504).

9. The temperature-sensitive reversing valve according to claim 1, characterized in that: When the movable plate (10) moves toward the sealing assembly (6), the first connecting rod (11) drives the second connecting rod (12) to move upwards; when the second connecting rod (12) moves upwards, the limiting plate (13) drives the round rod (14) to move upwards.

10. The temperature-sensitive reversing valve according to claim 7, characterized in that: When the round rod (14) moves upward, it drives the baffle (1503) to rotate seventy degrees clockwise through the second guide groove (1504). After rotating seventy degrees, the baffle (1503) shrinks to the inside of the second pipe (1502) and releases the seal of the square groove on the surface of the second pipe (1502).

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