CN217714053U

CN217714053U - Medical gas connecting mechanism

Info

Publication number: CN217714053U
Application number: CN202221661833.9U
Authority: CN
Inventors: 李红强; 黎群华
Original assignee: Maquet Suzhou Co Ltd
Current assignee: Maquet Suzhou Co Ltd
Priority date: 2022-06-29
Filing date: 2022-06-29
Publication date: 2022-11-01
Anticipated expiration: 2032-06-29

Abstract

The utility model discloses a medical gas connecting mechanism, which comprises a gas inlet port connected with medical gas, a gas outlet port connected with a gas inlet interface of medical equipment and a connecting component connected with the gas inlet interface; the connecting assembly comprises a movable part, a fixed part, an air inlet part connected with the air inlet interface and an elastic part; the air inlet part is provided with a connecting groove; the movable part is connected with the air inlet part in a sliding way and is provided with an inclined plane and a reset inclined plane; the fixed part is movably arranged in the connecting groove in a penetrating way and is selectively connected with the inclined plane or the reset inclined plane; pressing the movable part, wherein the inclined surface of the movable part drives the fixing part to be separated from the air inlet interface, and the air inlet interface is in a movable state; and releasing the movable part, wherein the reset inclined plane of the movable part drives the fixing part to be connected with the air inlet interface again under the action of the elastic part, and the air inlet interface is fixed with the medical gas connecting mechanism. The utility model discloses can realize medical gas coupling mechanism and medical instrument's quick locking through the mode that elasticity was pressed.

Description

Medical gas connecting mechanism

Technical Field

The utility model relates to a medical gas connecting mechanism.

Background

Currently, in the medical field, a large number of medical gas connection mechanisms are often installed on walls of wards and operating rooms, and are connected with medical instruments to supply medical gas needed by the medical instruments. The medical gas comprises oxygen, laughing gas, anesthetic waste gas and the like, wherein some gases are combustion-supporting gases, and some gases have anesthetic action; and therefore have high requirements in terms of leakage prevention.

The existing connecting structure is basically connected in a manual tightening mode, but the manual tightening mode is inconvenient to operate and long in use, and gas is easy to leak in the tightening process.

SUMMERY OF THE UTILITY MODEL

The utility model provides a not enough to prior art, the utility model provides a medical gas coupling mechanism, its mode of pressing through elasticity realizes medical gas coupling mechanism and medical instrument's quick locking.

The utility model discloses a following technical scheme realizes:

a medical gas connecting mechanism comprises a gas inlet port connected with medical gas and a gas outlet port connected with a gas inlet interface of medical equipment, and further comprises a connecting assembly connected with the gas inlet interface; the connecting assembly comprises a movable part, a fixed part, an air inlet part connected with the air inlet interface and an elastic part; the air inlet part is provided with a connecting groove; the movable part is connected with the air inlet part in a sliding way and is provided with an inclined plane and a reset inclined plane; the fixing piece is movably arranged in the connecting groove in a penetrating way and is selectively connected with the inclined surface or the reset inclined surface; pressing the movable part, wherein the inclined surface of the movable part drives the fixed part to be separated from the air inlet interface, and the air inlet interface is in a movable state; and releasing the movable part, wherein the reset inclined plane of the movable part drives the fixing part to be connected with the air inlet interface again under the action of the elastic part, and the air inlet interface is fixed with the medical gas connecting mechanism.

Furthermore, the movable part comprises a front cover and a connecting piece, and the front cover is fixedly connected with the connecting piece.

Furthermore, the front cover and the connecting piece are respectively movably connected with the air inlet piece.

Further, the front cover is provided with an inclined plane; the connecting piece is provided with a reset inclined plane; the fixing piece can be selectively abutted with the inclined surface or the reset inclined surface.

Furthermore, the medical gas connecting mechanism comprises a pair of fixing pieces, and the fixing pieces are symmetrically arranged on two sides of the gas inlet interface.

Further, the fixing piece is a long round pin.

Furthermore, the connecting groove is a rectangular groove with the length direction perpendicular to the axial direction of the air inlet piece.

Further, it still includes the valve seat, the valve seat is provided with the air flue, air inlet portion and air flue intercommunication.

Furthermore, one end of the elastic piece is abutted against the air inlet part, and the other end of the elastic piece is elastically connected with the connecting piece.

Further, the device also comprises a fixing sleeve; the medical gas connecting mechanism further comprises a second screw and a second fastening threaded sleeve, and the second screw sequentially penetrates through the gas inlet portion and the fixing sleeve and is fixedly connected with the second fastening threaded sleeve.

Compared with the prior art, the utility model has the advantages of:

1. through setting up coupling assembling for medical gas coupling mechanism can carry out the dismouting fast with the interface that admits air, convenient operation, and simple structure is reliable.

2. Through setting up movable part and elastic component, constitute elasticity and press the structure for the mounting can automatic re-setting, the improper situation that leads to the leakproofness not enough in the position that resets when having avoided personnel to operate.

3. Through setting up movable part and spread groove for the mounting can be followed the spread groove motion, and through the shape that changes the spread groove, can realize the mounting along the orbit motion of difference, satisfies the use under the multiple scene.

Drawings

Fig. 1 is a schematic structural view of a medical gas connection mechanism according to a preferred embodiment of the present invention;

FIG. 2 is a plan sectional view of the medical gas connection mechanism of FIG. 1 in a state of being connected to the gas inlet port;

FIG. 3 is a plan cross-sectional view of the medical gas connection mechanism of FIG. 1;

FIG. 4 is a schematic view of a portion of the gas connecting mechanism of FIG. 1;

FIG. 5 is another schematic structural view of a portion of the medical gas connection mechanism of FIG. 1;

FIG. 6 is a sectional plan view of a portion of the structure of the medical gas connection mechanism and the air inlet port of FIG. 1 in a fixed state;

FIG. 7 is a sectional plan view of a portion of the structure of FIG. 6 in a state where the gas connecting mechanism and the gas inlet port are separated from each other

FIG. 8 is an enlarged view of circle A in FIG. 2

FIG. 9 is an enlarged view of circle B in FIG. 3

Fig. 10 is a schematic view of another portion of the medical gas connection of fig. 1.

Detailed Description

As shown in fig. 1 to 3, a medical gas connection mechanism 1 according to a preferred embodiment of the present invention is provided. It includes the inlet port 18 connected with medical gas and the outlet port 19 connected with the inlet interface 2 of the medical equipment, and transmits the medical gas from the inlet port 18 to the outlet port 19, at the same time, supplies the medical gas to the medical equipment through the inlet interface 2 connected with the outlet port 19; wherein, the air inlet 2 is a gas connection secondary joint (which is the prior art and is not described herein), and the air inlet 2 is detachably mounted on a main body (not shown) of the medical device. Specifically, the inlet port 18 of the medical gas connection mechanism 1 is connected to a gas pump or a gas cylinder (not shown) for containing medical gas. The medical gas connecting mechanism 1 comprises a connecting component 11 connected with the gas inlet interface 2, a sealing component 12, an adjusting component 13, a pressure gauge 14, a valve seat 15, a threaded sleeve 16, a sealing sleeve 17, a fixing sleeve 22, a first screw 118 and a first fastening threaded sleeve 20. The valve seat 15 is provided with the gas passage 10 through which gas flows and a first step surface 152. The fixing sleeve 22 is fixedly connected to the panel of the medical tower crane or the bridge tower box through the first screw 118 and the first fastening threaded sleeve 20, and the fixing sleeve 22 is sleeved on the valve seat 15 and abuts against the first step surface 152. The air inlet port 2 is provided with a groove 21 which is matched with the connecting component 11.

With further reference to fig. 4 to 7, the connecting assembly 11 is fixedly connected to the valve seat 15 and includes a movable portion 110, a fixed portion 111, an air inlet portion 112 connected to the air inlet port 2, an elastic member 113, a second screw 114, a second screw fastening sleeve 115, and a cover plate 116. The cover plate 116 has one end connected to the valve seat 15 and the other end connected to the air inlet 112. The first screw 118 is sequentially inserted through the air inlet 112, the cover plate 116 and the fixing sleeve 22 and is fixedly connected to the first fastening screw sleeve 115, so that the connecting assembly 11 is fixedly mounted on the fixing sleeve 22. The air inlet interface 2 is movably arranged through the air inlet part 112. The air inlet part 112 is communicated with the air passage 10 and comprises an air inlet part 1121 movably connected with the fixing part 111 and a metal air inlet part 1122 abutted with the sealing assembly 12, and the air inlet part 1121 is fixedly connected with the metal air inlet part 1122; the air inlet 2 is sequentially disposed through the air inlet 1121 and the metal air inlet 1122. The air inlet part 1121 is provided with a connecting groove 1124 adapted to the fixing part 111, and further, the connecting groove 1124 is a rectangular groove with a length direction perpendicular to the axial direction of the air inlet part 1121; the connecting groove 1124 may be formed in other shapes as desired. The metal inlet 1122 is provided with a second step surface 1123, and the seal assembly 12 abuts the second step surface 1123. The movable portion 110 is connected to the fixed portion 111 and slidably connected to the air inlet portion 112 to drive the fixed portion 111 to move. The movable portion 110 is provided with a slope 1103 and a return slope 1104 and includes a front cover 1101 and a connector 1102; the front cover 1101 is fixedly connected with the connector 1102, and the front cover 1101 and the connector 1102 are movably connected with the air inlet 112 respectively. Specifically, the front cover 1101 and the connection member 1102 are slidably connected to the air inlet 1121 respectively. The front cover 1101 is provided with a slope 1103. The connection member 1102 is provided with a reset slope 1104 and connected with the elastic member 113. The fixing member 111 is selectively connected to the inclined surface 1103 or the reset inclined surface 1104 and movably connected to the air inlet portion 112, and is selectively coupled to or separated from the air inlet port 2. Specifically, the fixing member 111 is installed between the front cover 1101 and the connection member 1102 and is inserted into a connection groove 1124 of the air inlet portion 112, so that the fixing member 111 can move along the connection groove 1124 in a direction perpendicular to the axis of the air inlet port 2. Further, the fixing pieces 111 are provided with a pair and the pair of fixing pieces 111 are symmetrically distributed on two sides of the air inlet interface 2; the fixing member 111 is a long cylindrical pin. When the front cover 1101 is pressed (as indicated by an arrow D), the inclined surface 1103 of the front cover 1101 abuts against the fixing member 111 and drives the fixing member 111 to move, and the fixing member 111 moves along the connecting groove 1124 in a direction away from the air inlet 2 to separate from the air inlet 2; meanwhile, the connection member 1102 fixedly coupled with the front cover 1101 moves together with the front cover 1101 and presses the elastic member 113. When the front cover 1101 is released, the elastic element 113 rebounds and drives the connecting element 1102 to move, the reset inclined plane 1104 of the connecting element 1102 abuts against the fixed element 111 and drives the fixed element 111 to move, and the fixed element 111 moves along the connecting groove 1124 in a direction close to the air inlet port 2, so that the fixed element 111 is matched and connected with the air inlet port 2. By arranging the connecting assembly 11, the medical gas connecting mechanism 1 and the gas inlet interface 2 can be quickly disassembled and assembled, and the operation is convenient; the movable part 110 and the elastic part 113 form an elastic pressing structure, so that the fixing part 111 can automatically reset, the improper installation of the air inlet interface 2 and the medical gas connecting mechanism 1 caused by the misoperation of personnel is avoided, the connecting component 11 is convenient to operate, and the structure is simple; through the cooperation of inclined plane 1103, reset inclined plane 1104 and connecting groove 1124, make mounting 111 remove along connecting groove 1124, and through the shape that changes connecting groove 1124, can realize mounting 111 along different orbit motion, satisfy the use under the multiple scene.

With further reference to fig. 8 and 9, the seal assembly 12 is disposed within the airway 10 and includes a first seal 121 and a second seal 122. The first sealing part 121 is selectively connected with the air inlet interface 2 or the connecting assembly 11; the second sealing portion 122 is selectively separated from or connected to the connecting member 11; when the first sealing part 121 is connected with the air inlet interface 2 and the second sealing part 122 is separated from the connecting assembly 11, the air passage 10 is dredged; when the first sealing portion 121 or the second sealing portion 122 is connected to the connection assembly 11, the air passage 10 is sealed. Specifically, the first seal portion 121 abuts against the second stepped surface 1123 of the metal intake 1122. The first seal portion 121 includes an intake post 1211 that abuts against a second stepped surface 1123 of the metal intake member 1122, a spring 1212, and a first seal ring 1213. The first sealing ring 1213 is sleeved on the air inlet 2 and connected to the metal air inlet 1122 to prevent air from leaking from the connection gap between the air inlet 2 and the metal air inlet 1122, so as to improve the sealing performance of the device. One end of the spring 1212 is connected to the intake cylinder 1211, and the other end is connected to the second sealing portion 122. When the fixing member 111 is separated from the air inlet port 2, the spring 1212 applies elastic force to the air inlet cylinder 1211 to make the air inlet cylinder 1211 abut against the second step surface 1123 of the metal air inlet member 1122 to block the air passage 10; therefore, when the air inlet interface 2 is taken out, the air inlet column 1211 automatically seals the air passage 10 under the action of the spring 1212, so that air is prevented from leaking from the air passage 10 when the air inlet interface 2 is taken out, and the sealing performance of the whole device is improved. The second sealing assembly 122 is disposed through the connecting assembly 11 and includes an inner spring 1221, a stopper 1222, a valve plate 1223, a sealing member 1224, and a clamp spring 1225. The stop 1222 is connected to the metal air inlet 1122 and abuts the inner spring 1221. Specifically, the valve plate 1223 is inserted through the metal air inlet 1122 and the end 1226 thereof abuts against the end face 1125 of the metal air inlet 1122. One end of the stopper 1222 abuts against the valve plate 1223, and the other end abuts against the inner spring 1221; the inner spring 1221 applies an elastic force to the stopper 1222 to make the stopper 1222 closely abut against the valve sheet 1223 to improve the airtightness of the apparatus. Preferably, the sealing member 1224 is disposed around the metal air inlet 1122 and abuts against the inner wall 151 of the valve seat 15 to improve the air tightness of the connection of the metal air inlet 1122 with the valve seat 15; a snap spring 1225 is coupled to the seal 1224 to secure the seal 1224 against rotation of the seal 1224. When the medical gas connecting mechanism 1 is not communicated with the medical gas, the stop 1222 is abutted with the valve plate 1223 under the action of the inner spring 1221, so that the air channel 10 is blocked; after the medical gas connecting mechanism 1 is communicated with medical gas, the pressure in the air passage 10 is increased, the stop 1222 is pushed open, and the air passage 10 is dredged. When the inlet port 18 of the medical gas connection mechanism 1 is communicated with medical gas and the outlet port 19 is connected with the inlet interface 2, the airway 10 is unblocked, and the medical gas flows through the sealing assembly 12 from the inlet port 18 (as shown by an arrow W) and then flows out from the outlet port 19. When the inlet port 18 of the medical gas connection mechanism 1 is disconnected from the medical gas, the stopper 1222 of the second sealing portion 122 abuts against the valve plate 1223, and the gas channel 10 is blocked. When the air outlet port 19 of the medical gas connection mechanism 1 is disconnected from the air inlet port 2, the air inlet 1211 of the first sealing component 121 abuts against the metal air inlet 1122 of the connection component 11, and the air channel 10 is blocked. Therefore, when the air inlet port 18 and the air outlet port 19 of the medical gas connecting mechanism 1 are both in a communicated state, the air passage 10 is in a dredging state; when any one end of the air inlet port 18 and the air outlet port 19 of the medical gas connecting mechanism 1 is not in a connected state, the air channel 10 is blocked. Can realize through first sealing 121 at the in-process of interface 2 plug that admits air, the shutoff or the mediation can be realized automatically to air flue 10, avoids gaseous in-process of interface 2 that admits air at the plug to leak, improves the leakproofness of device, and easy operation is convenient. By arranging the second sealing part 122, when the medical gas connecting mechanism 1 is communicated or disconnected with medical gas, the air passage 10 can also be automatically plugged or dredged, so that leakage in the process of connecting the gas and the medical gas is avoided, and the sealing performance of the device is further improved. By arranging the first sealing part 121 and the second sealing part 122, when any end of the medical gas connecting mechanism 1 is in an unconnected state, the gas channel 10 is in a blocking state, so that gas is prevented from leaking from the gas channel 10 when the medical gas connecting mechanism 1 is in an unused state, and the sealing performance of the device is improved.

With further reference to fig. 10, the adjustment assembly 13 includes an inner sleeve 131, an adjustment portion 132, a seal 133, a second seal 134, a third seal 135, and a retaining block 136. The inner sleeve 131 penetrates through the valve seat 15 and is provided with a channel 1311 communicated with the air passage 10; the medical gas is communicated with the gas inlet port 2 through a passage 1311. The adjusting part 132 is connected with the inner sleeve 131; specifically, the adjusting portion 132 movably penetrates through the inner sleeve 131 and partially blocks the passage 1311, and the range of the blocked passage 1311 can be adjusted by adjusting the matching distance between the adjusting portion 132 and the inner sleeve 131. Therefore, an operator can change the requirements of different scenes by only adjusting the matching distance between the adjusting part 132 and the inner sleeve 131, and the device is convenient to operate and simple in structure. Specifically, the fixing block 136 is fixedly connected to the valve seat 15. The inner sleeve 131 is fixedly connected with the fixing block 136 to fix the adjusting component 13 and the valve body 15; a sealing gasket 133 is arranged between the bottom end of the inner sleeve 131 and the valve seat 15, specifically, one end of the sealing gasket 133 is abutted against the bottom end of the inner sleeve 131, and the other end is abutted against the inner wall 151 of the valve seat 15, so as to improve the sealing property of the connection of the inner sleeve 131 and the valve seat 15. The adjusting portion 132 includes a ventilation rod 1321 and a tightening head 1322. The tightening head 1322 is fixedly disposed through the vent rod 1321 and includes a head 1323 and a rod 1324. The parallel both sides face of axis of head 1323 and coupling assembling 1 is the cambered surface of indent, and the fillet is all carried out on each side of head 1323 to comfort level when improving the user and gripping. Preferably, head 1323 may be configured in other shapes to allow connection to other devices to allow for automatic control of head 1323. The stem 1324 is integrally formed with the head 1324 and is fixedly attached to the vent rod 1311. A second sealing ring 134 is disposed between the ventilation bar 1321 and the inner sleeve 131 to improve the sealing property of the connection between the two, and specifically, the second sealing ring 134 is sleeved on the tightening head 1322 and abuts against the ventilation bar 1321. The ventilation rod 1321 penetrates through the inner sleeve 131 and partially seals the channel 1311; the user can control the range of the vent lever 1321 for blocking the channel 1311 by pressing or pulling up the tightening head 1322; when the user presses the tightening head 1322, the passage area for gas circulation becomes smaller, the gas pressure increases, and the flow rate becomes smaller as the ventilation range of the passage 1311 becomes smaller; when the user pulls up the tightening head 1322, the passage area through which the gas flows becomes large as the ventilation range of the passage 1311 becomes large, the gas pressure decreases, and the flow rate becomes large. Preferably, a third sealing ring 135 is provided between the inner sleeve 131 and the valve seat 15 to improve the sealing property of the connection therebetween, and the third sealing ring 135 is fitted to the vent rod 1321 and abuts against the valve seat 15.

The pressure gauge 14 is fixedly connected with the valve seat 15 and is arranged at an air inlet port 18 of the medical gas connecting mechanism 1 to monitor the gas pressure in real time; the detection end 141 of the pressure gauge 14 is disposed in the air path 10. Through the cooperation of manometer 14 and adjusting part 13, the user can adjust gas pressure according to the needs of oneself, and can simply audio-visually observe the real-time change of pressure to realize more accurate regulated pressure.

A threaded sleeve 16 and a gland 17 are mounted on an inlet port 18 of the medical gas connection 1. The threaded sleeve 16 is connected to a corresponding gas pump or cylinder (not shown) containing a medical gas. The sealing sleeve 17 is arranged at the air inlet 18 of the medical gas connecting mechanism 1 and sleeved on the valve seat 15 to improve the sealing performance of the medical gas connecting mechanism 1 when being connected with medical gas.

When in use, the air inlet port 18 of the medical gas connecting mechanism 1 is communicated with the medical gas, the gas pressure in the air passage 10 of the medical gas connecting mechanism 1 is increased, and the stop block 1222 is pushed open; the outlet port 19 of the medical gas connection mechanism 1 is connected to the inlet port 2, and the inlet port 2 pushes the inlet stem 1211 to move and separate from the second step surface 1123 of the metal inlet 1122. At this time, the airway 10 is unblocked and medical gas flows into the inlet port 2. When the pressure or the flow of the gas needs to be adjusted, the tightening head 1322 is pressed or pulled up to control the area of the channel for the gas to circulate, and when the area of the channel for the gas to circulate becomes smaller, the pressure of the gas is increased, and the flow is decreased; when the area of the channel for gas circulation is increased, the gas pressure is reduced, and the flow is increased; and the gas pressure can be monitored in real time by the pressure gauge 14. Therefore, the medical gas connecting mechanism 1 and the gas inlet interface 2 can be quickly disassembled and assembled by arranging the connecting component 11, and the operation is convenient; the movable part 110 and the elastic part 113 form an elastic pressing structure, so that the fixing part 111 can automatically reset, the situation that the sealing performance is insufficient due to improper resetting position during operation of personnel is avoided, and the structure is simple; the first sealing part 121 can be used for automatically plugging or dredging the air passage 10 in the process of plugging and unplugging the air inlet interface 2, so that the air is prevented from leaking in the process of plugging and unplugging the air inlet interface 2, the sealing performance of the device is improved, and the operation is simple and convenient; by arranging the second sealing part 122, when the medical gas connecting mechanism 1 is connected with or disconnected from medical gas, the gas passage 10 can also be automatically plugged or dredged, so that gas is prevented from leaking from the gas passage 10, and the sealing performance of the device is further improved. Through setting up adjusting part 13, realize can adjusting gas pressure and flow with the mode of pressing and pulling up tightening head 1322, the simple operation, simple structure is reliable. By providing the pressure gauge 14, the gas pressure can be monitored in real time. By providing a plurality of sealing members, the sealing performance of the entire device is improved.

Claims

1. A medical gas connection mechanism comprises an air inlet port (18) connected with medical gas and an air outlet port (19) connected with an air inlet interface (2) of medical equipment, and is characterized in that the medical gas connection mechanism (1) further comprises a connection assembly (11) connected with the air inlet interface (2); the connecting component (11) comprises a movable part (110), a fixed part (111), an air inlet part (112) connected with the air inlet interface (2) and an elastic part (113); the air inlet part (112) is provided with a connecting groove (1124); the movable part (110) is connected with the air inlet part (112) in a sliding way and is provided with an inclined plane (1103) and a reset inclined plane (1104); the fixing piece (111) is movably arranged in the connecting groove (1124) in a penetrating way and is selectively connected with the inclined surface (1103) or the reset inclined surface (1104); pressing the movable part (110), wherein the inclined plane (1103) of the movable part (110) drives the fixing part (111) to be separated from the air inlet interface (2), and the air inlet interface (2) is in a movable state; the movable part (110) is released, the reset inclined plane (1104) of the movable part (110) drives the fixing part (111) to be matched and connected with the air inlet interface (2) again under the action of the elastic part (113), and the air inlet interface (2) is fixed with the medical gas connecting mechanism (1).

2. The medical gas connection according to claim 1, wherein the movable part (110) comprises a front cover (1101) and a connecting member (1102), the front cover (1101) being fixedly connected to the connecting member (1102).

3. Medical gas connection according to claim 2, wherein the front cover (1101) is provided with a bevel (1103); the connecting piece (1102) is provided with a reset inclined plane (1104); the fixing piece (111) can be selectively abutted with the inclined surface (1103) or the reset inclined surface (1104).

4. The medical gas connection according to claim 2, wherein the front cover (1101) and the connecting member (1102) are movably connected to the gas inlet portion (112), respectively.

5. The medical gas connection according to claim 1, wherein the medical gas connection (1) comprises a pair of fixing members (111), and the pair of fixing members (111) are symmetrically arranged on two sides of the gas inlet port (2).

6. Medical gas connection according to claim 5, wherein the fixing element (111) is an oblong peg.

7. The medical gas connection according to claim 1, wherein the connection groove (1124) is a rectangular groove having a length direction perpendicular to the axial direction of the gas inlet member (1121).

8. Medical gas connection according to claim 1, characterized in that it further comprises a valve seat (15), the valve seat (15) being provided with an air passage (10), the air inlet (112) communicating with the air passage (10).

9. The medical gas connection according to any of claims 1 to 8, wherein one end of the elastic member (113) abuts against the gas inlet portion (112) and the other end is elastically connected to the connection member (1102).

10. Medical gas connection according to claim 1, characterized in that it further comprises a harness (22); the medical gas connecting mechanism further comprises a second screw (114) and a second fastening threaded sleeve (115), wherein the second screw (114) sequentially penetrates through the gas inlet part (112) and the fixing sleeve (22) and is fixedly connected with the second fastening threaded sleeve (115).