A tee control valve with backflow function

Abstract

This utility model discloses a three-way control valve with a reflux function, comprising a first cylinder head mounted on the top of the valve body, a first valve stem and a second valve stem respectively slidably mounted at the two ends of the valve body, a quick-release seat mounted on the bottom of the valve body corresponding to the first valve stem, a discharge connector snapped onto the lower end of the quick-release seat, and a second cylinder head mounted on the bottom of the valve body corresponding to the second valve stem. This utility model enables automatic switching between externally supplied slurry and slurry recirculation, preventing slurry from accumulating and stratifying in the feed pipe and valve body during shutdown, thus avoiding slurry blockage. It eliminates the need to remove waste adhesive from the feed pipe and valve body before starting the next cycle of operation, preventing slurry waste and reduced efficiency. This solves the problems of inaccurate control, slurry waste, and low efficiency caused by traditional manual control of three-way valves for switching between externally supplied slurry and slurry recirculation.

Description

Technical Field

[0001] This utility model relates to the field of three-way control valves, and in particular to a three-way control valve with a reflux function. Background Technology

[0002] In the lithium battery manufacturing industry, burrs are typically generated during the tab cutting of electrode sheets. The formation of burrs during tab cutting is mainly related to equipment parameters, tool condition, material properties, and process control. Abnormal die clearance, tool wear, improper cutting methods, and deviations in the flatness or insufficient pressure of the die pressure plate can all lead to ineffective compaction of the cut edges. To reduce burrs at the electrode cutting edges, ceramic adhesive slurry can be applied to the cutting area. Automated tab cutting production lines are generally equipped with multiple adhesive application mechanisms, along with corresponding slurry containers. When the coating mechanism stops, the slurry in the channel between the coating mechanism and the slurry container is prone to sedimentation and stratification, which can lead to blockage of the channel. Furthermore, when restarting the coating mechanism to supply slurry, the sedimented slurry in the channel needs to be emptied, resulting in slurry waste. To address the waste caused by slurry sedimentation during shutdown, the traditional approach is to use a three-way valve to switch between external slurry supply and slurry recycling. Traditional three-way valves are mainly operated manually to switch the supply. In a multi-station spraying mechanism with a continuous flow operation, manually switching between external slurry supply and slurry recycling is extremely inconvenient, the switching control is inaccurate, and it still causes slurry waste and is inefficient. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a three-way control valve with a reflux function.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: The three-way control valve with reflux function includes a valve body, a first cylinder head, a second cylinder head, a first valve stem, a second valve stem, a quick-release seat, a discharge connector, a first air pipe connector, and a second air pipe connector. The first cylinder head is installed on the top of the valve body. The first valve stem is slidably mounted in one end of the valve body and is used to control the external supply of slurry. The second valve stem is slidably mounted in the other end of the valve body and is used to control the slurry reflux. The quick-release seat is installed at the bottom of the valve body and corresponds to the first valve stem. The quick-release seat is used to supply slurry. The discharge connector is snapped at the lower end of the quick-release seat and is used to connect to the material pipe for external slurry supply. The second cylinder head is installed at the bottom of the valve body and corresponds to the second valve stem. The second cylinder head is used for slurry reflux. The valve body has a first piston chamber and a first valve stem channel from top to bottom at one end. The first piston chamber extends through the top of the valve body, and the first valve stem channel extends through the bottom of the valve body. The first piston chamber and the first valve stem channel are connected. The valve body also has a second piston chamber and a second valve stem channel from top to bottom at the other end. The second piston chamber extends through the top of the valve body, and the second valve stem channel extends through the bottom of the valve body. The second piston chamber and the second valve stem channel are connected. The first cylinder head is provided with an upper cavity, which passes through the bottom of the first cylinder head corresponding to the first piston chamber and the second piston chamber, as well as one side of the first cylinder head. The upper cavity is connected to the first piston chamber and the second piston chamber. The upper end of the valve body is provided with a lower cavity, which is connected to the first valve stem channel and the second valve stem channel respectively, and the lower cavity penetrates one side of the valve body; The lower end of the valve body is provided with a feeding channel, which is connected to the first valve stem channel and the second valve stem channel respectively, and the feeding channel passes through one side of the valve body; The top of the first valve stem is integrally formed with a first piston, and the top of the second valve stem is integrally formed with a second piston; A first valve for blocking the passage of the first valve stem is sleeved on the lower end of the first valve stem; A second valve is installed at the bottom of the second valve stem passage. The second valve stem moves down to press against the inner hole of the second valve to block the second valve stem passage.

[0005] Preferably, a nut is threaded onto the lower end of the first valve stem, and the nut secures the first valve to the lower end of the first valve stem.

[0006] Preferably, the quick-release card holder is provided with a card holder discharge hole, which extends longitudinally through the quick-release card holder and is connected to the first valve stem channel.

[0007] Specifically, the quick-release seat is provided with a limiting rod on its circumference, and the top of the discharge connector is provided with a fixing groove adapted to the limiting rod. The fixing groove is L-shaped, and the upper end of the fixing groove extends to the top of the discharge connector to provide a locking interface.

[0008] Preferably, the second cylinder head is provided with a discharge hole that extends through the top and one side of the second cylinder head, and the second cylinder head is connected to the inner hole of the second valve through the discharge hole.

[0009] Preferably, a first air pipe connector is installed on one side of the first cylinder head, and the first air pipe connector is connected to the upper cavity. A second air pipe connector is installed on one side of the valve body, and the second air pipe connector is connected to the lower cavity.

[0010] Preferably, a first valve stem annular groove is provided on the circumference of the first valve stem, and a first valve stem ring is installed on the first valve stem annular groove to provide a sealing effect between the first valve stem channel and the first valve stem; The second valve stem has a second valve stem annular groove on its circumference, and a second valve stem ring is installed on the second valve stem annular groove to provide a sealing effect between the second valve stem channel and the second valve stem.

[0011] Preferably, the first piston has a first piston ring groove on its circumference, and a first piston ring is installed on the first piston ring groove to provide a sealing effect for the first piston cavity and the first piston. The second piston has a second piston ring groove on its circumference, and a second piston ring is installed on the second piston ring groove to provide a sealing function for the second piston chamber and the second piston.

[0012] Specifically, the bottom of the first cylinder head is provided with a first annular groove and a second annular groove at positions corresponding to the first piston chamber and the second piston chamber, respectively, and the first annular groove and the second annular groove are respectively equipped with a first sealing ring and a second sealing ring. The top of the quick-release card holder is provided with a third annular groove, on which a third sealing ring is installed. The lower circumference of the quick-release card holder is provided with a fourth annular groove, on which a fourth sealing ring is installed.

[0013] Compared with existing technologies, the advantages of this utility model are as follows: its overall structural design uses high-pressure air supplied to the upper or lower chamber to drive the first and second valve rods to move up and down, thereby realizing the automatic switching between external slurry supply and slurry circulation. This prevents the slurry from accumulating and stratifying in the feeding pipe and valve body when the spraying mechanism stops working, avoiding slurry blockage in the feeding pipe and valve body. Furthermore, it eliminates the need to remove waste adhesive from the feeding pipe and valve body before starting the next cycle of work, and also eliminates the need for manual time-consuming control of the three-way valve to switch the supply. This avoids slurry waste, is simple and convenient to use, saves time and effort, greatly improves the control accuracy and work efficiency of the supply, and has the advantages of good sealing and strong versatility. It effectively solves the problems of inaccurate control, slurry waste, and low efficiency caused by the traditional method of manually controlling the three-way valve to switch between external slurry supply and slurry circulation. Attached Figure Description

[0014] For ease of explanation, the present invention will be described in detail below with reference to the preferred embodiments and accompanying drawings.

[0015] Figure 1 This is a perspective view of a three-way control valve with a reflux function according to this utility model.

[0016] Figure 2 This is a cross-sectional view of a three-way control valve with reflux function according to the present invention.

[0017] Figure 3 This is a perspective view of the internal structure of a three-way control valve with reflux function according to this utility model. Detailed Implementation

[0018] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of this utility model. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0020] Reference Figures 1 to 3As shown, this utility model discloses a three-way control valve with a reflux function, comprising a valve body 1, a first cylinder head 21, a second cylinder head 22, a first valve stem 31, a second valve stem 32, a quick-release seat 4, a discharge connector 5, a first air pipe connector 61, and a second air pipe connector 62. The first cylinder head 21 is mounted on the top of the valve body 1. The first valve stem 31 is slidably mounted in one end of the valve body 1 and is used to control the external supply of slurry. The second valve stem 32 is slidably mounted in the other end of the valve body 1 and is used to control the slurry reflux. The quick-release seat 4 is mounted on the bottom of the valve body 1 and corresponds to the first valve stem 31. The quick-release seat 4 is used to control the slurry reflux. The external slurry supply is achieved by a discharge connector 5 snap-fitted onto the lower end of the quick-release seat 4 and used to connect to an external material pipe for external slurry supply. A second cylinder cover 22 is installed at the bottom of the valve body 1 and corresponds to the second valve stem 32. The second cylinder cover 22 is used for slurry return. One end of the valve body 1 has a first piston chamber 71 and a first valve stem channel 81 arranged from top to bottom. The first piston chamber 71 extends through the top of the valve body 1, and the first valve stem channel 81 extends through the bottom of the valve body 1, and the first piston chamber 71 and the first valve stem channel 81 are connected. The other end of the valve body 1 has a second piston chamber 72 and a second valve stem channel 82 arranged from top to bottom. The piston cavity 72 extends through the top of the valve body 1, the second valve stem channel 82 extends through the bottom of the valve body 1, and the second piston cavity 72 and the second valve stem channel 82 are connected; the first cylinder head 21 is provided with an upper cavity 10, which extends through the bottom of the first cylinder head 21 corresponding to the first piston cavity 71 and the second piston cavity 72, as well as one side of the first cylinder head 21, and is connected to the first piston cavity 71 and the second piston cavity 72; the upper end of the valve body 1 is provided with a lower cavity 11, which is connected to the first valve stem channel 81 and the second valve stem channel 82, and extends through one side of the valve body 1; The lower end of the valve body 1 is provided with a feed channel 12, which is connected to the first valve stem channel 81 and the second valve stem channel 82 respectively, and the feed channel 12 penetrates one side of the valve body 1; the top of the first valve stem 31 is integrally formed with a first piston 91, and the top of the second valve stem 32 is integrally formed with a second piston 92; the lower end of the first valve stem 31 is fitted with a first valve 13 for sealing the first valve stem channel 81; the bottom of the second valve stem channel 82 is fitted with a second valve 14, and the second valve stem 32 moves down to press the inner hole 141 of the second valve 14 to seal the second valve stem channel 82. The quick-release seat 4 is a functional description of a snap-fit ​​seat or clip seat that can be quickly installed. The container for storing slurry is connected to the feed channel 12 through a feed pipe, and a feed pipe connector 29 is provided at the connection between the feed pipe and the feed channel 12, and the feed pipe connector 29 is installed on one side of the valve body 1.

[0021] By adopting the above technical solution, the container storing slurry supplies slurry to the feed channel 12 through the feed pipe. The feed channel 12 supplies slurry to the first valve stem channel 81 and the second valve stem channel 82 respectively. When high-pressure air is supplied to the upper chamber 10, the high-pressure air in the upper chamber 10 enters the first piston chamber 71 and the second piston chamber 72 respectively. The high-pressure air in the first piston chamber 71 and the second piston chamber 72 pushes the first piston 91 and the second piston 92 downward respectively. The first piston 91 drives the first valve stem 31, which in turn drives the first valve 13 downward, so that the first valve 13 is separated from the lower port of the first valve stem channel 81. The slurry in the feed channel 12 is sent into the first valve stem channel 81 and output through the lower port of the first valve stem channel 81 to supply slurry to the spraying device. The second piston 92 drives the second valve stem 32, which in turn drives the second valve 14 downward, until the lower end of the second valve stem 32 is inserted into the inner hole 141 of the second valve 14 to block the slurry in the second valve stem channel 82. When high-pressure air is supplied to the lower chamber 11, the high-pressure air in the lower chamber 11 enters the first piston chamber 71 and the second piston chamber 72 respectively. The high-pressure air in the first piston chamber 71 and the second piston chamber 72 pushes the first piston 91 and the second piston 92 upward respectively. The first piston 91 drives the first valve stem 31, which in turn drives the first valve 13 to move upward. The first valve 13 closes with the lower port of the first valve stem channel 81 to block the slurry in the first valve stem channel 81. The second piston 92 drives the second valve stem 32 to move upward, and the lower end of the second valve stem 32 exits the inner hole of the second valve 14. 141 releases the slurry in the second valve stem channel 82. The slurry flows back to the slurry storage container through the lower port of the second valve stem channel 82, realizing the automatic switching between external slurry supply and slurry circulation. This prevents the slurry from staying in the feed pipe and valve body 1 for a long time when the spraying device stops working, thus avoiding the phenomenon of sedimentation and stratification. It also avoids the slurry clogging the feed pipe and valve body 1, and avoids the waste of slurry caused by the need to remove waste adhesive from the feed pipe and valve body 1 when starting the next round of work. This saves slurry and greatly improves work efficiency.

[0022] Reference Figure 2 and Figure 3 As shown, a nut 15 is threadedly connected to the lower end of the first valve stem 31, and the nut 15 fixes the first valve 13 to the lower end of the first valve stem 31.

[0023] Reference Figure 3 As shown, the quick-release card holder 4 is provided with a card holder discharge hole 41, which extends longitudinally through the quick-release card holder 4 and is connected to the first valve stem channel 81.

[0024] By adopting the above technical solution, when the first valve stem 31 drives the first valve 13 to move downward, the first valve 13 separates from the lower port of the first valve stem channel 81, the first valve stem channel 81 supplies slurry to the card seat outlet hole 41 in the quick card seat 4, and the card seat outlet hole 41 supplies slurry to the outside.

[0025] Reference Figure 1 As shown, a limiting rod 42 is provided on the circumference of the quick-release seat 4, and a fixing groove 51 adapted to the limiting rod 42 is provided on the top of the discharge connector 5. The fixing groove 51 is L-shaped, and the upper end of the fixing groove 51 extends to the top of the discharge connector 5 to provide a card interface.

[0026] By adopting the above technical solution, the bottom of the discharge connector 5 is sleeved with the feeding pipe, the top of the discharge connector 5 is connected to the quick clamp seat 4, the clamping interface of the fixing groove 51 is aligned with the limiting rod 42, the discharge connector 5 is pushed upward to put the discharge connector 5 on the quick clamp seat 4, the discharge connector 5 is rotated and the discharge connector 5 is snapped onto the quick clamp seat 4, thus realizing the quick installation of the discharge connector 5.

[0027] Reference Figure 2 and Figure 3 As shown, the second cylinder head 22 is provided with a discharge hole 16, which penetrates the top and one side of the second cylinder head 22. The second cylinder head 22 is connected to the inner hole 141 of the second valve 14 through the discharge hole 16.

[0028] By adopting the above technical solution, when the second valve stem 32 moves upward, the lower end of the second valve stem 32 exits the inner hole 141 of the second valve 14 to unseal the slurry in the second valve stem channel 82. The slurry flows through the lower port of the second valve stem channel 82 to the discharge port 16 of the second cylinder head 22, and then flows back to the container for storing slurry through the lower port of the discharge port 16. This prevents the slurry from accumulating and stratifying in the feed pipe and valve body 1 when work stops, thus avoiding slurry blockage of the feed pipe and valve body 1. At the same time, it eliminates the need to remove waste adhesive from the feed pipe and valve body 1 when starting the next round of work, thereby improving work efficiency.

[0029] Reference Figure 1 and Figure 2 As shown, a first air pipe connector 61 is installed on one side of the first cylinder head 21, and the first air pipe connector 61 is connected to the upper cavity 10; a second air pipe connector 62 is installed on one side of the valve body 1, and the second air pipe connector 62 is connected to the lower cavity 11.

[0030] By adopting the above technical solution, the first air pipe connector 61 and the second air pipe connector 62 are connected to the external air supply system. The air supply system supplies high-pressure air to the upper chamber 10 and the lower chamber 11 through the first air pipe connector 61 and the second air pipe connector 62 respectively, so as to drive the first valve stem 31 and the second valve stem 32 to move up and down respectively, and finally realize the automatic switching between external slurry supply and slurry circulation return.

[0031] In this embodiment, a first interface 611 for installing a first air pipe connector 61 is provided on one side of the first cylinder head 21, and a second interface 621 for installing a second air pipe connector 62 is provided on one side of the valve body 1.

[0032] Reference Figure 2 and Figure 3 As shown, the first valve stem 31 has a first valve stem annular groove 171 on its circumference, and a first valve stem ring 181 is installed on the first valve stem annular groove 171 to provide a sealing function between the first valve stem channel 81 and the first valve stem 31; the second valve stem 32 has a second valve stem annular groove 172 on its circumference, and a second valve stem ring 182 is installed on the second valve stem annular groove 172 to provide a sealing function between the second valve stem channel 82 and the second valve stem 32.

[0033] By adopting the above technical solution, a first valve stem ring 181 and a second valve stem ring 182 are respectively sleeved on the first valve stem 31 and the second valve stem 32. The first valve stem ring 181 and the second valve stem ring 182 together seal and isolate the lower cavity 11 from the feed channel 12, preventing the slurry from entering the lower cavity 11 from the feed channel 12, thus ensuring good sealing performance.

[0034] Reference Figure 3 As shown, the first piston 91 has a first piston ring groove 911 on its circumference, and a first piston ring 912 is installed on the first piston ring groove 911 to provide a sealing function for the first piston cavity 71 and the first piston 91; the second piston 92 has a second piston ring groove 921 on its circumference, and a second piston ring 922 is installed on the second piston ring groove 921 to provide a sealing function for the second piston cavity 72 and the second piston 92.

[0035] By adopting the above technical solution, the upper cavity 10 is connected to the first piston cavity 71 and the second piston cavity 72, and the first piston cavity 71 and the second piston cavity 72 are respectively connected to the lower cavity 11. The first piston ring 912 and the second piston ring 922 are respectively sleeved on the first piston 91 and the second piston 92. The first piston ring 912 and the second piston ring 922 seal and isolate the upper cavity 10 and the lower cavity 11, preventing the high-pressure air in the upper cavity 10 and the lower cavity 11 from entering each other, ensuring that the lifting and lowering movement of the first valve stem 31 and the second valve stem 32 can be accurately controlled, thereby realizing the automatic switching of precise control of external slurry supply and slurry circulation return.

[0036] Reference Figure 2 As shown, the bottom of the first cylinder head 21 is provided with a first annular groove 19 and a second annular groove 20 at positions corresponding to the first piston chamber 71 and the second piston chamber 72, respectively. The first annular groove 19 and the second annular groove 20 are respectively equipped with a first sealing ring 23 and a second sealing ring 24. The top of the quick-release seat 4 is provided with a third annular groove 25, and a third sealing ring 26 is installed on the third annular groove 25. The lower circumference of the quick-release seat 4 is provided with a fourth annular groove 27, and a fourth sealing ring 28 is installed on the fourth annular groove 27.

[0037] By adopting the above technical solution, the first annular groove 19 and the second annular groove 20 of the first cylinder head 21 are respectively equipped with a first sealing ring 23 and a second sealing ring 24. The first sealing ring 23 and the second sealing ring 24 provide a sealing effect for the assembly of the first cylinder head 21 and the valve body 1. The third annular groove 25 at the top of the quick-release seat 4 is equipped with a third sealing ring 26. The third sealing ring 26 provides a sealing effect for the assembly of the valve body 1 and the quick-release seat 4. The fourth annular groove 27 on the lower circumference of the quick-release seat 4 is equipped with a fourth sealing ring 28. The fourth sealing ring 28 provides a sealing effect for the quick-release connector 5 to be quickly snapped onto the quick-release seat 4, thus achieving time-saving and labor-saving assembly and disassembly.

[0038] The above embodiments are merely examples of this utility model and are not intended to limit the implementation and scope of this utility model. All technical solutions that are the same as or equivalent to the contents described in the claims of this utility model should be included within the protection scope of this utility model.

Claims

1. A three-way control valve with reflux function, characterized in that: The device includes a valve body, a first cylinder head, a second cylinder head, a first valve stem, a second valve stem, a quick-release bracket, a discharge connector, a first air pipe connector, and a second air pipe connector. The first cylinder head is installed on the top of the valve body. The first valve stem is slidably mounted in one end of the valve body and is used to control the external supply of slurry. The second valve stem is slidably mounted in the other end of the valve body and is used to control the slurry backflow. The quick-release bracket is installed at the bottom of the valve body and corresponds to the first valve stem. The quick-release bracket is used to supply slurry externally. The discharge connector is snapped at the lower end of the quick-release bracket and is used to connect to the material pipe for external slurry supply. The second cylinder head is installed at the bottom of the valve body and corresponds to the second valve stem. The second cylinder head is used for slurry backflow. The valve body has a first piston chamber and a first valve stem channel from top to bottom at one end. The first piston chamber extends through the top of the valve body, and the first valve stem channel extends through the bottom of the valve body. The first piston chamber and the first valve stem channel are connected. The valve body also has a second piston chamber and a second valve stem channel from top to bottom at the other end. The second piston chamber extends through the top of the valve body, and the second valve stem channel extends through the bottom of the valve body. The second piston chamber and the second valve stem channel are connected. The first cylinder head is provided with an upper cavity, which passes through the bottom of the first cylinder head corresponding to the first piston chamber and the second piston chamber, as well as one side of the first cylinder head. The upper cavity is connected to the first piston chamber and the second piston chamber. The upper end of the valve body is provided with a lower cavity, which is connected to the first valve stem channel and the second valve stem channel respectively, and the lower cavity penetrates one side of the valve body; The lower end of the valve body is provided with a feeding channel, which is connected to the first valve stem channel and the second valve stem channel respectively, and the feeding channel passes through one side of the valve body; The top of the first valve stem is integrally formed with a first piston, and the top of the second valve stem is integrally formed with a second piston; A first valve for blocking the passage of the first valve stem is sleeved on the lower end of the first valve stem; A second valve is installed at the bottom of the second valve stem passage. The second valve stem moves down to press against the inner hole of the second valve to block the second valve stem passage.

2. A three-way control valve with reflux function according to claim 1, characterized in that: A nut is threaded onto the lower end of the first valve stem, and the nut secures the first valve to the lower end of the first valve stem.

3. A three-way control valve with reflux function according to claim 1, characterized in that: The quick-release seat is provided with a seat discharge hole, which extends longitudinally through the quick-release seat and is connected to the first valve stem channel.

4. A three-way control valve with reflux function according to claim 2, characterized in that: The quick-release seat has a limiting rod on its circumference, and the top of the discharge connector has a fixing groove that is adapted to the limiting rod. The fixing groove is L-shaped, and the upper end of the fixing groove extends to the top of the discharge connector to provide a locking interface.

5. A three-way control valve with reflux function according to claim 1, characterized in that: The second cylinder head is provided with a discharge hole, which extends through the top and one side of the second cylinder head. The second cylinder head is connected to the inner hole of the second valve through the discharge hole.

6. A three-way control valve with reflux function according to claim 1, characterized in that: A first air pipe connector is installed on one side of the first cylinder head, and the first air pipe connector is connected to the upper cavity; A second air pipe connector is installed on one side of the valve body, and the second air pipe connector is connected to the lower cavity.

7. A three-way control valve with reflux function according to claim 1, characterized in that: The first valve stem has a first valve stem annular groove on its circumference, and a first valve stem ring is installed on the first valve stem annular groove to provide a sealing effect between the first valve stem channel and the first valve stem; The second valve stem has a second valve stem annular groove on its circumference, and a second valve stem ring is installed on the second valve stem annular groove to provide a sealing effect between the second valve stem channel and the second valve stem.

8. A three-way control valve with reflux function according to claim 1, characterized in that: The first piston has a first piston ring groove on its circumference, and a first piston ring is installed on the first piston ring groove to provide a sealing function for the first piston chamber and the first piston. The second piston has a second piston ring groove on its circumference, and a second piston ring is installed on the second piston ring groove to provide a sealing function for the second piston chamber and the second piston.

9. A three-way control valve with reflux function according to claim 4, characterized in that: The bottom of the first cylinder head is provided with a first annular groove and a second annular groove at positions corresponding to the first piston chamber and the second piston chamber, respectively. The first annular groove and the second annular groove are respectively equipped with a first sealing ring and a second sealing ring. The top of the quick-release card holder is provided with a third annular groove, on which a third sealing ring is installed. The lower circumference of the quick-release card holder is provided with a fourth annular groove, on which a fourth sealing ring is installed.

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