Cupping gun with multiple driving modes

Abstract

The utility model relates to the technical field of cupping devices, in particular to a cupping gun with multiple driving modes. Comprising a main body shell in which a mounting cavity and a negative pressure cavity are formed; an air suction port is formed in the front end of the negative pressure cavity, and the rear end of the negative pressure cavity communicates with the mounting cavity; the negative pressure device is mounted in the mounting cavity, is partially arranged in the negative pressure cavity and is used for enabling the air suction port to generate negative pressure; the negative pressure device is at least provided with a first negative pressure mechanism which is movably mounted in the negative pressure cavity, the rear end of a piston rod of the first negative pressure mechanism extends into the mounting cavity, and an exhaust passage is formed in the first negative pressure mechanism; the driving mechanism is mounted on the main body shell, is partially arranged in the mounting cavity and is used for driving the first negative pressure mechanism to move in the negative pressure cavity; the second negative pressure mechanism is mounted in the mounting cavity, and the air suction port is connected with the exhaust passage through a hose; the first negative pressure mechanism is driven by the driving mechanism to move in the negative pressure cavity, so that the air suction port generates negative pressure; or the second negative pressure mechanism works to enable the air suction port to generate negative pressure.

Description

Technical Field

[0001] The utility model relates to the technical field of cupping devices, in particular to a cupping gun with multiple driving modes. Background Art

[0002] There are many home cupping devices on the market now, which suck out the air in the cup to create negative pressure inside the cup, so that it can be adsorbed on the skin. Compared with the previous method of using fire to heat the air in the cup to make the density of the air inside the cup less than the density of the air outside, the method of sucking out the air in the cup by using a cupping gun is not only safer, but also easier to operate.

[0003] There are two main types of cupping devices on the market. The first type relies on human power to control the cupping device to remove the air in the cup. For example, Chinese patent CN200920233700.X discloses a cupping gun exhaust device, which describes a cupping device that exhausts the gas in the cup by pulling it manually.

[0004] The second type is an electric cupping device, such as Chinese patent CN201621086382.5 which discloses an electric vacuum cupping combination device, which describes a cupping device that performs vacuum by electric means.

[0005] The following deficiencies still exist in the current technology:

[0006] The current cupping device is usually operated in a single way, but the manual and electric operation modes have their own advantages and different hand feel when used, so they are favored by people of different ages and physical conditions. As a cupping device used at home by ordinary people, the frequency of use itself is relatively low, and the need to purchase an additional set of cupping devices just because of the different driving modes undoubtedly increases people's burden, so people need a cupping device that combines two driving modes. Utility Model Content

[0007] The purpose of the utility model is to provide a cupping gun with multiple driving modes, so that the same cupping device has multiple driving modes to match the use needs of different groups of people.

[0008] The purpose of this utility model is achieved in this way:

[0009] A cupping gun with multiple driving modes, including:

[0010] The main body shell has an installation cavity and a negative pressure cavity formed therein; an air inlet is formed at the front end of the negative pressure cavity, and the rear end of the negative pressure cavity is connected to the installation cavity;

[0011] A negative pressure device, which is installed in the installation cavity and partially placed in the negative pressure cavity, and is used to generate negative pressure at the air inlet;

[0012] Wherein, the negative pressure device at least has:

[0013] A first negative pressure mechanism is movably mounted in the negative pressure chamber, a rear end of a piston rod of the first negative pressure mechanism extends into the mounting chamber, and an exhaust passage is provided in the first negative pressure mechanism;

[0014] A driving mechanism, which is mounted on the main housing and partially disposed in the mounting cavity and connected to the first negative pressure mechanism, and is used to drive the first negative pressure mechanism to move in the negative pressure cavity;

[0015] A second negative pressure mechanism is installed in the installation cavity, and the air inlet is connected to the exhaust duct through a hose;

[0016] The driving mechanism drives the first negative pressure mechanism to move in the negative pressure chamber, so that negative pressure is generated at the air inlet; or

[0017] The second negative pressure mechanism works to generate negative pressure at the air inlet.

[0018] Preferably, a one-way valve is installed in the first negative pressure mechanism to block the front end of the exhaust duct;

[0019] When the first negative pressure mechanism is working, the one-way valve blocks the front end of the exhaust passage;

[0020] When the second negative pressure mechanism is in operation, the one-way valve is opened, so that outside air can enter the exhaust passage through the air inlet.

[0021] Preferably, the main body shell includes a main body portion and a handle portion;

[0022] The second negative pressure mechanism is installed in the installation cavity of the handle part, and the air inlet of the second negative pressure mechanism is connected to the air outlet of the first negative pressure mechanism disposed in the main body part through a hose.

[0023] Preferably, the second negative pressure mechanism comprises:

[0024] A motor, which is used to drive the fan to work, thereby forming a negative pressure environment;

[0025] A battery for supplying power to the motor;

[0026] A circuit board, used for controlling the operation of the motor;

[0027] The main body shell is provided with a control panel, through which corresponding signals can be sent to control the circuit board to change the working state of the motor.

[0028] Preferably, the front end of the piston rod is connected to a piston portion, and the piston portion is arranged in the negative pressure chamber;

[0029] When the piston rod moves, it can drive the piston part to move in the negative pressure chamber and inhale gas from the air inlet into the negative pressure chamber.

[0030] Preferably, the driving mechanism comprises:

[0031] A trigger, one end of which is hinged inside the main body shell and the other end of which extends out of the main body shell;

[0032] A transmission plate is fixed on the trigger, and an arc-shaped rack is formed on the transmission plate, and the arc-shaped rack is coaxial with the trigger.

[0033] When the said rotating, it can drive the said transmission plate to rotate together;

[0034] Gear 1, which is meshed with the arc-shaped rack, so that the gear 1 can be driven by the transmission disk;

[0035] Gear 2 is coaxial with the gear, and can drive gear 2 to rotate together when gear 1 rotates;

[0036] A rack portion is formed on the piston rod, and the rack portion is meshed with the fan gear.

[0037] Preferably, the gear one and the gear two are both fan gears.

[0038] Preferably, the gear one and the gear two are integrally formed.

[0039] Preferably, the one-way valve comprises:

[0040] an outer ring portion, which is used to abut against the peripheral side of the piston rod;

[0041] a shielding portion, the area of ​​which is larger than the exhaust duct;

[0042] A connecting portion, used to connect the outer ring portion and the shielding portion;

[0043] When the air pressure on one side of the one-way seal is greater than the air pressure on the other side, the shielding portion is pushed to move.

[0044] Preferably, the piston portion comprises:

[0045] A fixing part 1, on which a connecting groove is formed, so that the fixing part 1 can be connected to the end of the piston rod;

[0046] A second fixing part, which is sleeved on the outer side of the piston rod;

[0047] A sealing ring, which is clamped between the first fixing part and the second fixing part;

[0048] The one-way valve is installed in the connecting groove, and a through hole is opened in the connecting groove, and the through hole is used to conduct the air intake port and the exhaust duct;

[0049] When one end of the piston rod is placed into the bottom end of the connecting groove, the edge of the piston rod presses against the outer ring portion.

[0050] Compared with the prior art, the utility model has the following outstanding and beneficial technical effects:

[0051] 1. This technical solution opens a through hole inside the piston rod for the negative pressure component to absorb air, so that no matter it is driven manually or electrically, the air flow is sucked into the cupping device through a single inlet, and the working state is stable, thereby combining the manual and electric driving modes on the same cupping device, so as to meet the use needs of different groups of people and reduce people's expenses.

[0052] 2. The technical solution is also provided with a one-way seal for blocking the exhaust hole for the negative pressure component to inhale air, so that the gas now flows out of the negative pressure component to ensure that when the air is manually extracted, the air pressure in the suction chamber will not be reduced, thereby ensuring the stability of the manual suction state.

[0053] 3. The manual operation mode of this technical solution is driven by a manual control trigger, and the electric controller is set on the shell. It is simple and convenient, and easy for people to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 It is a structural diagram of the utility model.

[0055] Figure 2 It is a cross-sectional view of the utility model.

[0056] Figure 3 for Figure 2 Enlarged view of point A in the middle.

[0057] Figure 4 It is a partial diagram of the drive assembly of the utility model.

[0058] Figure 5 It is a structural schematic diagram of the one-way valve of the utility model.

[0059] Reference numerals:

[0060] 1. Main body shell; 11. Installation cavity; 12. Negative pressure cavity; 13. Main body; 14. Handle; 15. Cover; 16. Air inlet; 17. Control panel;

[0061] 2. first negative pressure mechanism; 21. piston rod; 22. exhaust passage; 23. piston portion; 24. sealing ring; 25. flange; 26. first fixing portion; 261. connecting groove; 262. through hole; 27. second fixing portion; 28. convex ring portion; 29. ​​rack portion;

[0062] 3. Second negative pressure mechanism; 31. Motor; 32. Battery; 33. Hose; 34. Circuit board;

[0063] 4. Driving mechanism; 41. Transmission plate; 42. Gear 1; 43. Gear 2; 44. Arc rack;

[0064] 5. One-way valve; 51. Outer ring portion; 52. Connecting portion; 53. Shielding portion;

[0065] 6. Trigger; 61. Articulated portion; 62. Hand lever portion; 63. Latch. DETAILED DESCRIPTION

[0066] The following are specific embodiments of the present invention, and the technical solution of the present invention is further described in conjunction with the accompanying drawings, but the present invention is not limited to these embodiments.

[0067] Embodiment 1:

[0068] like Figure 1 and Figure 2 A cupping gun with multiple driving modes is shown, including:

[0069] The main body shell 1 has a mounting cavity 11 and a negative pressure cavity 12. The front end of the negative pressure cavity 12 has an air inlet 16, and the rear end of the negative pressure cavity 12 is connected to the mounting cavity 11. When a negative pressure environment is formed in the negative pressure cavity 12, air is sucked into the negative pressure cavity 12 through the air inlet 16.

[0070] The negative pressure device is installed in the installation cavity 11 and is partially placed in the negative pressure cavity 12 . The negative pressure device is used to generate negative pressure at the air inlet 16 , thereby sucking external air into the negative pressure cavity 12 .

[0071] Wherein, the negative pressure device at least has:

[0072] The first negative pressure mechanism 2 is movably mounted in the negative pressure chamber 12, and the rear end of the piston rod 21 of the first negative pressure mechanism 2 extends into the mounting chamber 11, and an exhaust passage 22 is provided in the first negative pressure mechanism 2;

[0073] A driving mechanism 4, which is mounted on the main housing 1 and partially disposed in the mounting cavity 11 and connected to the first negative pressure mechanism 2, and is used to drive the first negative pressure mechanism 2 to move in the negative pressure cavity 12;

[0074] The second negative pressure mechanism 3 is installed in the installation cavity 11, and the air inlet 16 is connected to the exhaust duct 22 through a hose 33;

[0075] The driving mechanism 4 drives the first negative pressure mechanism 2 to move in the negative pressure chamber 12 so that the air inlet 16 generates negative pressure; or

[0076] The second negative pressure mechanism 3 operates to generate negative pressure in the air intake port 16 .

[0077] In the present embodiment, the first negative pressure mechanism 2 is manually operated to suck external air into the negative pressure chamber 12 through the air intake port 16, while the second negative pressure mechanism 3 is electrically operated to form negative pressure, and sucks away the air at the air intake port 16 through the hose 33 and the exhaust duct 22 connected to the hose 33, so that a negative pressure environment is formed at the air intake port 16, so that the gas outside the main shell 1 can enter the negative pressure chamber.

[0078] like Figure 1-Figure 3 As shown, a one-way valve 5 is installed in the first negative pressure mechanism 2 to block the front end of the exhaust passage 22 .

[0079] When the first negative pressure mechanism 2 is working, the one-way valve 5 blocks the front end of the exhaust passage 22;

[0080] When the second negative pressure mechanism 3 is in operation, the one-way valve 5 is opened, so that outside air can enter the exhaust passage 22 through the air inlet 16 .

[0081] Therefore, when the first negative pressure mechanism 2 is working, the airflow will not enter the exhaust duct 22. This ensures that the air pressure in the negative pressure chamber 12 can remain stable during manual operation, and prevents gas from entering the negative pressure chamber 12 to increase the air pressure in the negative pressure chamber 12, thereby maintaining a stable working state of the product.

[0082] When the second negative pressure mechanism 3 is working, the one-way valve 5 will open, allowing the airflow to enter the exhaust passage 22. By providing the one-way valve 5, the two different driving modes of the technical solution will not interfere with each other when working separately.

[0083] like Figure 1-Figure 3 As shown, the main housing 1 includes a main body portion 13 and a handle portion 14 .

[0084] The motor 31 of the second negative pressure mechanism 3 is installed in the installation cavity 11 of the handle portion 14, which effectively utilizes the space inside the main housing 1 so that the overall volume is not too large and is suitable for human grip.

[0085] The motor 31 is used to drive the fan blades to work, thereby sucking away the air inside the hose 33 to form a negative pressure, and through the hose 33, a negative pressure is also formed at the air inlet 16 to facilitate the inhalation of air.

[0086] The air inlet 16 of the second negative pressure mechanism 3 is connected to the exhaust passage 22 of the first negative pressure mechanism 2 disposed in the main body 13 via a hose 33 .

[0087] like Figure 1-Figure 3 As shown, the second negative pressure mechanism 3 includes:

[0088] The motor 31 is used to drive the fan to work, thereby forming a negative pressure environment;

[0089] A battery 32 for supplying power to the motor 31;

[0090] A circuit board 34, which is used to control the operation of the motor 31;

[0091] A control panel 17 is disposed on the main housing 1 , and a corresponding signal can be sent to the control circuit board 34 through the control panel 17 to change the working state of the motor 31 .

[0092] like Figure 1-Figure 3 As shown, the front end of the piston rod 21 is connected to a piston portion 23, and the piston portion 23 is disposed in the negative pressure chamber 12;

[0093] When the piston rod 21 moves, it can drive the piston part 23 to move in the negative pressure chamber 12, so that the space between the piston part 23 and the air intake port 16 becomes larger and the air pressure decreases, thereby achieving the purpose of sucking gas from the air intake port 16 into the negative pressure chamber 12.

[0094] like Figure 1-Figure 4 As shown, the driving mechanism 4 includes:

[0095] The trigger 6 comprises a hinged portion 61 and a hand button portion 62, wherein the hinged portion 61 is hinged inside the main housing 1 through a latch 63, and the hand button portion 62 extends out of the main housing 1;

[0096] The transmission plate 41 is sleeved on the latch 63 and fixed on the trigger 6. The transmission plate 41 is formed with an arc-shaped rack 44, and when the trigger 6 rotates, the transmission plate 41 can be driven to rotate together;

[0097] Gear 1 42, which meshes with the arc-shaped rack 44, so that gear 1 42 can be driven by the transmission plate 41;

[0098] Gear 2 43 is coaxial with gear 1 42 , and when gear 1 42 rotates, it can drive gear 2 43 to rotate together, thereby transmitting the movement trend generated by gear 1 42 to gear 2 43 , so that gear 2 43 can rotate the same angle as gear 1 42 .

[0099] A rack portion 29 is formed on the piston rod 21 , and the rack portion 29 meshes with the second gear 43 .

[0100] When the user holds the handle 14 , the finger can extend from the hand button 62 of the trigger 6 and drive the trigger 6 to rotate, thereby driving the piston rod 21 to move in the horizontal direction through the transmission plate 41 , gear 1 42 and gear 2 43 .

[0101] Furthermore, the hand buckle 62 is formed into a closed ring. Therefore, when the user holds the handle 14 and passes the fingers through the inner side of the hand buckle 62, the fingers can apply force to the hand buckle 62 from two directions, thereby achieving the purpose of driving the piston rod 21 to reciprocate.

[0102] Specific as Figure 2 and Figure 4 As shown, both the gear 1 42 and the gear 2 43 are fan gears, so that the space occupied by the gear 1 42 and the gear 2 43 can be further reduced, and the volume of the main housing 1 can be reduced.

[0103] As another preferred embodiment, gear one 42 and gear two 43 are integrally formed, thereby ensuring that gear one 42 and gear two 43 can rotate through the same angle, thereby improving the accuracy of the working state.

[0104] like Figure 1-Figure 5 As shown, in this embodiment, the one-way valve 5 is a one-way baffle, and the one-way valve 5 includes:

[0105] An outer ring portion 51, which is used to abut against the peripheral side of the piston rod 21;

[0106] The shielding portion 53 has an area larger than the exhaust duct 22;

[0107] The connecting portion 52 is used to connect the outer ring portion 51 and the shielding portion 53 .

[0108] When the air pressure on one side of the one-way valve 5 is greater than the air pressure on the other side, the shielding portion 53 is pushed to move, thereby connecting or blocking the air inlet 16 and the exhaust duct 22 .

[0109] like Figure 1-Figure 5 As shown, the piston portion 23 includes:

[0110] The fixing part 26 has a connecting groove 261 formed thereon, so that the fixing part 26 can be connected to the end of the piston rod 21 and can move together with the piston rod 21;

[0111] The second fixing portion 27 is sleeved on the outer side of the piston rod 21;

[0112] The sealing ring 24 is clamped between the first fixing portion 26 and the second fixing portion 27 , and its peripheral side forms a flange 25 , and the flange 25 abuts against the inner wall of the negative pressure chamber 12 .

[0113] The one-way valve 5 is installed in the connecting groove 261 . A through hole 262 is opened in the connecting groove 261 . The through hole 262 is used to connect the air intake port and the air exhaust passage 22 .

[0114] When one end of the piston rod 21 is inserted into the bottom end of the connecting groove 261 , the edge of the piston rod 21 presses against the outer ring portion 51 , and the movement of the shielding portion 53 is not hindered.

[0115] In this embodiment, the one-way valve 5 is arranged on the side of the through hole 262 facing the piston rod 21. Figure 2 As shown in the figure, the direction of the through hole 262 toward the air inlet 16 is called the left side of the through hole 262, and the side of the through hole 262 toward the piston rod 21 is called the right side of the through hole 262. This is only to facilitate readers to understand the content of the technical solution, and does not further limit the protection scope of this embodiment.

[0116] When the first negative pressure mechanism 2 is working, the piston portion 23 moves with the piston rod 21 in the negative pressure chamber 12 and moves away from the air inlet 16, causing the air pressure in the negative pressure chamber 12 to be lower than the external air pressure, and the external air is sucked into the negative pressure chamber 12 through the air inlet 16. Since the air pressure on the left side of the through hole 262 is lower than the air pressure on the right side of the through hole at this time, the shielding portion 53 of the one-way valve 5 is adsorbed and attached to the peripheral side of the through hole 262, thereby achieving the purpose of closing the through hole 262.

[0117] When the second negative pressure mechanism 3 is working, negative pressure is formed in the exhaust passage 22 because the motor 31 is working. At this time, the air pressure on the right side of the through hole 262 is lower than the air pressure on the left side of the through hole 262, so the airflow will pass through the through hole 262 to push open the shielding portion 53 and enter the exhaust passage 22, so that the air inlet 16 and the exhaust passage 22 are connected.

[0118] Embodiment 2:

[0119] This embodiment is basically the same as the first embodiment, except that a convex ring portion 28 is formed on the circumferential side of the piston rod 21. When the first fixing portion 26 and the second fixing portion 27 are sleeved on the end of the piston rod 21, the second fixing portion 27 will be clamped between the first fixing portion 26 and the convex ring portion 28 to achieve fixation.

[0120] An elastic member, which may be a spring, is disposed in the connecting groove 261. One end of the elastic member abuts against the bottom of the connecting groove 261, and the other end abuts against the convex ring portion 28 or the second fixing portion 27, thereby being able to drive the piston rod 21 to reset in time.

[0121] Embodiment three:

[0122] This embodiment is basically the same as the first embodiment, except that the main housing 1 includes a cover 15, and the air inlet 16 is provided on the cover 15. The cover 15 and the handle 14 are detachably connected to form the main housing 1, and when the cover 15 is connected to the handle 14, a negative pressure chamber 12 is formed inside the cover 15, so that the piston rod 21 and the piston 23 of the first negative pressure mechanism 2 are easily installed.

[0123] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A cupping gun with multiple driving modes, characterized in that: include: A main body shell (1) is provided with a mounting cavity (11) and a negative pressure cavity (12); a suction port (16) is provided at the front end of the negative pressure cavity (12), and a rear end of the negative pressure cavity (12) is connected to the mounting cavity (11); A negative pressure device, which is installed in the installation cavity (11) and partially disposed in the negative pressure cavity (12), and is used to generate negative pressure at the air inlet (16); Wherein, the negative pressure device at least has: A first negative pressure mechanism (2) is movably mounted in the negative pressure chamber (12), and a rear end of a piston rod (21) of the first negative pressure mechanism (2) extends into the mounting chamber (11), and an exhaust passage (22) is provided in the first negative pressure mechanism (2); A driving mechanism (4), which is mounted on the main housing (1) and partially disposed in the mounting cavity (11), and is connected to the first negative pressure mechanism (2), and is used to drive the first negative pressure mechanism (2) to move in the negative pressure cavity (12); A second negative pressure mechanism (3) is installed in the installation cavity (11), and the air intake port (16) is connected to the air exhaust duct (22) via a hose (33); The driving mechanism (4) drives the first negative pressure mechanism (2) to move in the negative pressure chamber (12), so that the air inlet (16) generates negative pressure; or The second negative pressure mechanism (3) operates to generate negative pressure at the air intake port (16).

2. A cupping gun with multiple driving modes according to claim 1, characterized in that: A one-way valve (5) is installed in the first negative pressure mechanism (2) for blocking the front end of the exhaust passage (22); When the first negative pressure mechanism (2) is in operation, the one-way valve (5) blocks the front end of the exhaust passage (22); When the second negative pressure mechanism (3) is in operation, the one-way valve (5) is opened, allowing outside air to enter the exhaust passage (22) through the air intake port (16).

3. A cupping gun with multiple driving modes according to claim 2, characterized in that: The main housing (1) comprises a main body portion (13) and a handle portion (14); The second negative pressure mechanism (3) is installed in the installation cavity (11) of the handle portion (14), and the air inlet (16) of the second negative pressure mechanism (3) is connected to the exhaust passage (22) of the first negative pressure mechanism (2) disposed in the main body portion (13) via a hose (33).

4. A cupping gun with multiple driving modes according to claim 3, characterized in that: The second negative pressure mechanism (3) comprises: A motor (31) is used to drive the fan to work, thereby forming a negative pressure environment; A battery (32) for supplying power to the motor (31); A circuit board (34) for controlling the operation of the motor (31); The main body shell (1) is provided with a control panel (17), through which a corresponding signal can be sent to control the circuit board (34) to change the working state of the motor (31).

5. A cupping gun with multiple driving modes according to claim 3 or 4, characterized in that: The front end of the piston rod (21) is connected to a piston portion (23), and the piston portion (23) is arranged in the negative pressure chamber (12); When the piston rod (21) moves, it can drive the piston portion (23) to move in the negative pressure chamber (12), and inhale gas from the air inlet (16) into the negative pressure chamber (12).

6. A cupping gun with multiple driving modes according to claim 5, characterized in that: The driving mechanism (4) comprises: a trigger (6), one end of which is hinged inside the main housing (1) and the other end of which protrudes out of the main housing (1); a transmission plate (41) fixed on the trigger (6); an arc-shaped rack (44) is formed on the transmission plate (41); the arc-shaped rack (44) is coaxial with the trigger (6), and when the trigger (6) rotates, the transmission plate (41) can be driven to rotate together; Gear 1 (42), which is meshed with the arc-shaped rack (44), so that the gear 1 (42) can be driven by the transmission plate (41); Gear 2 (43), which is coaxial with gear 1 (42), and can drive gear 2 (43) to rotate together when gear 1 (42) rotates; A rack portion is formed on the piston rod (21), and the rack portion is meshed with the second gear (43).

7. A cupping gun with multiple driving modes according to claim 6, characterized in that: The gear one (42) and the gear two (43) are both fan gears.

8. A cupping gun with multiple driving modes according to claim 6 or 7, characterized in that: The gear one (42) and the gear two (43) are integrally formed.

9. The cupping gun with multiple driving modes according to claim 5, characterized in that: The one-way valve (5) comprises: An outer ring portion (51) for abutting against the peripheral side of the piston rod (21); A shielding portion (53) having an area larger than the exhaust duct (22); A connecting portion (52) used to connect the outer ring portion (51) and the shielding portion (53); When the air pressure on one side of the one-way valve (5) is greater than the air pressure on the other side, the shielding portion (53) is pushed to move.

10. A cupping gun with multiple driving modes according to claim 9, characterized in that: The piston part (23) comprises: A fixing portion (26) having a connecting groove (261) formed thereon so that the fixing portion (26) can be connected to the end of the piston rod (21); A second fixing portion (27) which is sleeved on the outer side of the piston rod (21); A sealing ring (24) which is clamped between the first fixing portion (26) and the second fixing portion (27); The one-way valve (5) is installed in the connecting groove (261), a through hole (262) is opened in the connecting groove (261), and the through hole (262) is used to connect the air intake port and the exhaust duct (22); When one end of the piston rod (21) is inserted into the bottom end of the connecting groove (261), the edge of the piston rod (21) presses against the outer ring portion (51).

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