CN110433072A - Traditional Chinese Medicine Fumigation Massage Device - Google Patents

Abstract

The invention relates to a traditional Chinese medicine fumigation massage device, which comprises a base body, a flat plate, a soft cushion and a gas gathering cover, wherein a water pool and a medicine pool are respectively arranged below the flat plate on the base body, the upper part of the medicine pool is communicated with the upper part of the water pool through a channel, a ball float valve for controlling the on-off of the channel is arranged on the base body, and the on-off of the ball float valve is controlled by the liquid level in the medicine pool; the flat plate is provided with a plurality of piston chambers arranged below the flat plate, the piston chambers are internally provided with pistons and piston rods which vertically slide, the upper ends of the piston rods penetrate through the flat plate in a sliding manner, the lower ends of the piston rods are connected with the pistons, springs are arranged above the pistons in the piston chambers, and two ends of the springs are respectively contacted with the flat plate and the pistons; the lower part of the piston chamber is communicated with the upper part of the water pool, a plurality of pressure release valves which are communicated with the piston chamber in a one-to-one correspondence mode are arranged on the flat plate, and the opening and closing of the pressure release valves are controlled by the vertical position of the piston rod; the flat plate is provided with a plurality of vertical air holes which are uniformly distributed along the outer edge of the soft pad, and the lower ends of the air holes are communicated with the upper part of the medicine pool; the invention can be used for fumigating and massaging and has convenient operation.

Description

Traditional Chinese Medicine Fumigation Massage Device

technical field

The invention relates to a traditional Chinese medicine massage device, in particular to a traditional Chinese medicine fumigation massage device.

Background technique

As a kind of traditional Chinese medicine external therapy, traditional Chinese medicine fumigation treatment has always been favored by the majority of medical staff and patients. With the continuous advancement of modern technology, this therapy has been widely used in many aspects such as leisure health care, rehabilitation and clinical treatment; In this case, the treatment equipment for traditional Chinese medicine fumigation is also constantly being updated, aiming to provide people with a more comfortable and healthy treatment experience; in the prior art, common traditional Chinese medicine fumigation equipment also includes More modern and intelligent electric steam fumigation equipment, traditional sitz bath equipment has single function, inconvenient use, and limited fumigation effect. Electric fumigation equipment is convenient to operate, but because the steam contains a lot of water vapor, it is easy to cause electric shock accidents, so there is a certain degree of safety Hidden dangers, and the cost of this type of equipment is relatively high, it depends on electric energy, has high requirements for external conditions and use environment, and is not universally applicable.

Contents of the invention

In view of the above situation, in order to make up for the technical deficiencies in the prior art, the present invention provides a traditional Chinese medicine fumigation and massage device to solve the problems of insufficient function, poor safety, limited use conditions and insufficient applicability of the existing device.

The technical solution is to include a base body, a flat plate placed horizontally on the base body, a soft cushion placed on the flat plate, and a gas gathering cover covered above the soft cushion. The base has water pools respectively placed under the flat plate And the medicine pool, the upper part of the medicine pool is connected with the upper part of the pool through the horizontal channel, the maximum effective liquid level in the pool is higher than the channel, and the maximum effective liquid level in the medicine pool is not higher than the maximum effective liquid level in the pool. Liquid level height; there is a floating ball valve on the substrate to control the opening and closing of the channel, and the opening and closing of the floating ball valve is controlled by the liquid level height in the medicine pool; there are multiple piston chambers placed under the flat plate on the said plate, and there are vertical valves in the piston chamber. The sliding piston and the piston rod placed vertically above the piston, the upper end of the piston rod slides upwards through the flat plate and contacts the lower end surface of the cushion, the lower end of the piston rod is connected with the piston, and the piston chamber is placed vertically above the piston. The two ends of the spring are in contact with the flat plate and the piston respectively. Under the elastic force of the spring, the piston drives the piston rod to slide downward at the same time; the lower part of the piston chamber is connected with the upper part of the pool through a hose to make the pool The steam enters the piston chamber through the hose, and the steam pressure pushes the piston to move upward. There are a plurality of pressure relief valves placed under the plate and connected with the piston chamber one by one on the plate. The opening and closing of the pressure relief valve is controlled by The vertical position of the piston rod is controlled, so that the pressure in the piston chamber is continuously accumulated and released, so that the piston drives the piston rod to reciprocate vertically; The several vertical air holes are placed inside the gas-gathering hood, and the lower end of the air hole communicates with the upper part of the drug pool through a conduit placed below the plate so that the liquid medicine vapor flows through the air holes to the inside of the gas-gathering hood above the plate.

The present invention can perform fumigation treatment and auxiliary massage at the same time or alternatively to meet the needs of different patients; the present invention uses steam to drive massage, which can avoid the hidden danger of electric leakage in the electric massage device and provide a safer medical experience; the pool can not only It provides steam power for massage, and can also replenish enough high-temperature hot water for the medicine pool in time, so that the generation process of medicine steam is more coherent. The water replenishment process of the medicine pool is automatically controlled by the float valve without manual intervention, reducing the burden on medical staff; The heating equipment required by the present invention can be flexibly selected according to actual conditions, and is widely applicable to different medical conditions and use environments.

Description of drawings

Fig. 1 is the front view of the present invention.

Figure 2 is an axonometric view of the present invention.

Fig. 3 is a cross-sectional view of the present invention.

Fig. 4 is an enlarged view of part A in Fig. 3 of the present invention.

Fig. 5 is an enlarged view of part B in Fig. 3 of the present invention.

Fig. 6 is an axonometric sectional view of the present invention after removing the gas collecting cover.

Detailed ways

The specific implementation manners of the present invention will be described in further detail below in conjunction with the accompanying drawings.

Given by Fig. 1 to Fig. 6, the present invention comprises base body 1, is placed on the plate 2 that is arranged horizontally on base body 1, is placed on the cushion 3 on plate 2 and is covered in the gas gathering cover 4 above cushion 3, described The substrate 1 has a pool 5 and a drug pool 6 respectively placed under the flat plate 2. The upper part of the drug pool 6 communicates with the upper part of the pool 5 through a horizontally arranged channel 7. The maximum effective liquid level in the pool 5 is high. In the channel 7, the maximum effective liquid level height of the medicine pool 6 is not higher than the maximum effective liquid level height in the pool 5; there is a float valve 8 for controlling the on-off of the channel 7 on the substrate 1, and the opening and closing of the float valve 8 passes through the medicine pool 6 Control the liquid level in the tank: add water to the pool 5 and the medicine pool 6 respectively and make the liquid level in the pool 5 higher than the passage 7, and the liquid level in the medicine pool 6 is not higher than the liquid level in the pool 5; When the liquid level in the medicine pool 6 drops to the set height, the float valve 8 is opened to make the channel 7 accessible, and the water in the pool 5 flows into the medicine pool 6 to realize automatic replenishment; when the water in the pool 5 enters the medicine pool 6, the medicine pool 6 After the liquid level inside rises to the set height, the float valve 8 is closed to block the channel 7, and the water in the pool 5 is blocked and cannot flow into the medicine pool 6; A piston chamber 9, there is a vertically sliding piston 10 and a piston rod 11 placed vertically above the piston 10 in the piston chamber 9, and the upper end of the piston rod 11 slides upwards through the flat plate 2 and meets the lower end surface of the cushion 3 contact, the lower end of the piston rod 11 is connected to the piston 10, and there is a spring 12 placed vertically above the piston 10 in the piston chamber 9. , the piston 10 drives the piston rod 11 to slide downward at the same time; the bottom of the piston chamber 9 communicates with the top of the pool 5 through the hose 13 so that the steam in the pool 5 enters the piston chamber 9 through the hose 13, and then the steam pressure Push the piston 10 to move upwards. There are a plurality of pressure relief valves 14 placed under the plate 2 and communicated with the piston chamber 9 one by one on the plate 2. The opening and closing of the pressure relief valve 14 is determined by the vertical position of the piston rod 11. Control the pressure in the piston chamber 9 to continuously accumulate and release, so that the piston 10 drives the piston rod 11 to reciprocate vertically; specifically: when the piston 10 drives the piston rod 11 to slide upward to the high point of the stroke, the pressure relief valve 14 The opening reduces the pressure in the piston chamber 9, and the spring 12 releases the compression potential energy to make the piston 10 drive the piston rod 11 to slide downward, so that the piston rod 11 leaves the high point of the stroke. At this time, the pressure relief valve 14 is closed to gradually increase the pressure in the piston chamber 9 again. High, for the next upward sliding energy storage of the piston 10, thereby realizing the vertical reciprocating slide of the piston rod 11, and then realizing the massage effect through the continuous jacking up of the cushion 3 part by the upper end of the piston rod 11; the flat plate 2 There are a number of vertical air holes 15 evenly distributed on the periphery of the soft pad 3 along the outer edge of the cushion 3. The air holes 15 are placed inside the gas gathering cover 4, and the lower ends of the air holes 15 and the upper part of the medicine pool 6 pass through The conduit 16 placed under the plate 2 communicates to allow the liquid medicine vapor to flow through the air holes 15 to the inside of the gas gathering hood 4 above the plate 2 .

Further, the medicine pool 6 is screwed to the base body 1 so that the medicine pool 6 can be removed to fill with medicine or to be cleaned.

Further, the upper end of the medicine pool 6 is lower than the upper end of the pool 5, the base 1 has a vertical chute 17 placed above the medicine pool 6, and the upper part of the pool 5 and the vertical chute 17 are horizontally arranged passages 7 connected, the base 1 has an inner tube 18 sliding in the vertical chute 17, the upper end of the inner tube 18 is closed and provided with a horizontal water inlet 19 corresponding to the channel 7, the lower end of the inner tube 18 There is a floating ball 20 placed below the vertical chute 17 and a water outlet hole 21 placed between the vertical chute 17 and the floating ball 20, the vertical chute 17, the inner pipe 18, the water inlet hole 19, the floating The ball 20 and the water outlet hole 21 form a ball float valve 8. When the ball float 20 floats up and down, the inner tube 18 slides up and down accordingly so that the water inlet hole 19 corresponds to or staggers with the channel 7, thereby realizing the on-off control of the channel 7: to the pool 5 Add water respectively in the medicine pool 6 and make the liquid level height in the pool 5 higher than the passage 7, the liquid level height of the medicine pool 6 is lower than the lower end of the vertical chute 17; when the liquid level in the medicine pool 6 drops to the setting When the height is high, the floating ball 20 sinks so that the water inlet 19 corresponds to the passage 7, and now the passage 7 is a passage, and the water flow in the pool 5 enters the medicine pool 6 through the passage 7, the water inlet 19, the inner pipe 18 and the water outlet 21 successively. Realize automatic replenishment of water; when the water in the pool 5 enters the medicine pool 6 to make the liquid level in the medicine pool 6 rise to the set height, the float valve 20 floats up so that the water inlet hole 19 crosses the position of the channel 7 and is placed above the channel 7. At this time The channel 7 is blocked by the pipe wall of the inner pipe 18, and the water in the pool 5 is blocked and cannot flow into the medicine pool 6.

Further, the upper end of the inner tube 18 is a through opening and the through opening is a water inlet hole 19. When the upper end of the inner tube 18 is lower than the upper edge of the channel 7, the water in the pool 5 flows into the medicine pool 6. This arrangement Under certain conditions, the water inlet hole 19 can be used to directly add water to the medicine pool 6, without setting a separate water injection port.

Further, the piston 10 has a through hole 22 vertically penetrating the piston 10, and the piston rod 11 has a blind hole 23 with an opening facing downward corresponding to the through hole 22; the outer edge of the piston rod 11 The surface is provided with a vertical keyway 24, and there is an accommodating groove 25 corresponding to the keyway 24 on the flat plate 2. There is a vertically sliding flat key 26 in the keyway 24, and a part of the flat key 26 is placed in the keyway 24 and Slidingly connected with the keyway 24, the other part of the flat key 26 is placed in the accommodating groove 25 and is frictionally and slidably connected with the accommodating groove 25; the bottom of the keyway 24 is provided with a vertical straight groove 27 communicating with the blind hole 23 , there is a through hole 28 corresponding to the straight groove 27 on the flat key 26, the length of the straight groove 27 is greater than the sliding distance of the flat key 26 in the keyway 24, when the flat key 26 slides in the keyway 24, the through hole 28 slides thereupon And communicate with the straight groove 27 all the time; The groove bottom top of described accommodation groove 25 is provided with the pressure relief hole 29 that communicates with the space below plate 2, when flat key 26 slides to the upper end of accommodation groove 25, through hole 28 Corresponding to the pressure relief hole 29 coaxially, when the flat key 26 slides to the lower end of the accommodation groove 25, the through hole 28 and the pressure relief hole 29 are completely staggered; the through hole 22, the blind hole 23, the keyway 24, the accommodation The groove 25, the flat key 26, the straight groove 27, the through hole 28 and the pressure relief hole 29 form the pressure relief valve 14. During the vertical sliding process of the piston rod 11, the friction between the flat key 26 and the accommodation groove 25 makes the flat The key 26 remains motionless, and when the upper/lower end of the keyway 24 contacts the flat key 26, the flat key 26 moves synchronously with the piston rod 11, that is, the flat key 26 and the piston rod 11 have a delay synchronization effect; the flat key 26 piston After the rod 11 moves synchronously, the relative position of the through hole 28 and the pressure relief hole 29 changes, so as to realize the accumulation or release of the pressure in the piston chamber 9, so that the piston rod 11 will reciprocate vertically with the piston movement of the piston 19. , and then achieve the massage effect; and the delay synchronization between the flat key 26 and the piston rod 11 can effectively increase the time between the through hole 28 and the pressure relief hole 29 to keep relatively still, thereby increasing the vertical movement of the piston rod 11 The distance is conducive to increasing the massage force and improving the massage effect.

Further, there is a hollow interlayer 30 arranged horizontally on the flat plate 2, the pressure relief valve 14 is placed in the interlayer 30, there is a drain hole 31 communicating with the interlayer 30 on the flat plate 2, and there is a drain hole 31 below the flat plate 2. 31 is connected to the drain pipe 32 .

Further, the flat plate 2 has an inner chamber 33 placed below the air holes 15 and arranged around the distribution direction of the air holes 15, the air holes 15 communicate with the inner chamber 33, and the upper part of the medicine pool 6 is connected to the inner chamber. Cavity 33 is communicated via a plurality of conduits 16 placed below plate 2; utilizing inner chamber 33 to connect several air holes 15 can significantly reduce the quantity of conduits 16 required when air holes 15 communicate with medicine pool 6, which is conducive to pipeline layout and facilitates post-maintenance.

Further, the base body 1 has a steam chamber 34 and a medicine gas chamber 35 placed above the water pool 5 and the medicine pool 6 respectively, and the lower end surfaces of the steam chamber 34 and the medicine gas chamber 35 respectively have a plurality of ventilation holes 36, and the water pool 5 The steam in the tank and the medicine gas in the medicine pool 6 enter the steam chamber 34 and the medicine gas chamber 35 respectively through the vent hole 36; It is connected through the conduit 16; under this setting condition, the hose 13 and the conduit 16 do not need to be directly connected with the water pool 5 and the medicine pool 6, so that the water pool 5 and the medicine pool 6 are relatively independent, and it is convenient to disassemble and manage the water pool 5 and the medicine pool 6 And maintenance.

Further, the flat plate 2 has a backflow groove 37 arranged around the outer edge of the cushion 3 and placed inside the gas collecting cover 4, and a plurality of vertically arranged backflow holes 38 communicated with the backflow groove 37, so that the steam condenses Afterwards, it gathers in the backflow groove 37 and flows down along the backflow hole 38 to the bottom of the plate 2 or the interlayer 30 .

Further, there is a water injection port 39 on the pool 5 .

Further, the left end of the gas-gathering hood 4 is a closed structure, and the right end of the gas-gathering hood 4 has a curtain 40, which is convenient for patients to enter and exit, and can effectively prevent internal steam from leaking out.

Further, there are electric heating devices in the water pool 5 and the medicine pool 6 .

When in use, put the medicine into the medicine pool 6 and pour water into the pool 5 and the medicine pool 6 respectively and heat them, so that the patient enters the gas gathering hood 4 and lies flat on the cushion 3. As the water temperature rises, Steam is generated in the water pool 5 and medicine pool 6 respectively; the steam in the water pool 5 enters the piston chamber 9 through the hose 13, and as the steam pressure in the piston chamber 9 continues to rise, the piston 10 is pushed to move up, and then leaks out. The pressure valve 14 is opened to release the pressure so that the piston 10 moves down under the elastic force of the spring 12, so that the vertical reciprocating sliding of the piston rod 11 is realized by reciprocating in this way, and then the corresponding part of the cushion 3 is continuously lifted and lowered by the piston rod 11 to realize Massage to the patient's body; the steam in the medicine pool 6 contains medicinal ingredients, and enters the gas-gathering hood 4 above the flat plate 2 through the conduit 16 and the air hole 15 in turn. With the continuous increase of the steam in the gas-gathering hood 4, the steam will The patient's body is completely surrounded, and the heat in the steam promotes the opening of the pores on the patient's body surface, and the medicinal ingredients in the steam enter the human body through the pores to achieve the therapeutic effect of fumigation.

At the same time, the steam discharged through the pressure relief valve 14 gathers under the flat plate 2 or in the interlayer 30, so that the flat plate 2 is heated. On the one hand, it is beneficial to improve the comfort of the patient, and on the other hand, it can slow down the steam in the gas-gathering hood 4 to a certain extent. The condensation speed is fast, so that the steam containing the drug ingredients can fully contact the patient's body, and improve the drug absorption effect.

With the continuous evaporation of water in the medicine pool 6, the liquid level in the medicine pool 6 gradually drops, and the dissolution efficiency of the medicine decreases. Therefore, the float valve 8 is used in the present invention to realize the automatic replenishment of water in the medicine pool 6, and the supplemented water comes from the pool 5, and the water in the pool 5 is also in a high temperature state, which can effectively avoid the weakening and interruption of the drug vapor in the reheating process after replenishing water, making the fumigation and massage process more consistent; when the water in the pool 5 is insufficient, directly through the water injection port 39 It is enough to inject an appropriate amount of water, and this process does not directly affect the temperature and steam concentration in the medicine pool 6.

In addition, part of the steam discharged through the pressure relief valve 14 will enter the gas-gathering hood 4 through the return hole 38. This part of the steam can further increase the temperature and concentration of the steam in the gas-gathering hood 4, and slow down the pressure in the gas-gathering hood 4. The condensation rate of the steam; when the concentration of steam in the gas-gathering hood 4 reaches a saturated state, the steam continuously entering it increases the internal pressure of the gas-gathering hood 4. At this time, the excess steam can flow downward through the return hole 38, so that Normal, stable pressure is maintained in the gas-gathering hood 4.

The liquid formed after steam condensation in the gas gathering hood 4 accumulates in the reflux tank 37 and flows into the bottom of the plate 2 or the interlayer 30 through the reflux hole 38; for the plate 2 provided with the interlayer 30, the steam in the interlayer 30 condenses and gathers in the interlayer 30 bottom and flow out through drain hole 31 and drain pipe 32.

The present invention has perfect function and convenient operation, and auxiliary massage can be performed at the same time during the fumigation treatment process, and the two treatments can be carried out simultaneously or independently, which can meet the needs of different patients; the present invention adopts steam-driven massage, It can avoid the hidden danger of electric leakage in the electric massage device and provide a safer medical experience; the pool independent of the medicine pool can not only provide steam power for massage, but also replenish enough hot water for the medicine pool in time, so that the generation process of medicine steam is more efficient. Coherent; the float valve automatically controls the water replenishment process of the medicine pool, without manual intervention, reducing the burden on medical staff; when in use, it is only necessary to heat the water pool and the medicine pool, and the choice of heating equipment and energy is more flexible and can be widely used It is suitable for different medical conditions and usage environments.

Claims (10)

1. Traditional Chinese medicine fumigation and massage device, including a base (1), a flat plate (2), a soft cushion (3) and a gas gathering cover (4), characterized in that the base (1) is respectively placed on The water pool (5) and medicine pool (6) under the plate (2), the upper part of the medicine pool (6) communicates with the upper part of the water pool (5) through the channel (7), and the control channel (7) is provided on the substrate (1). The floating ball valve (8) is disconnected, and the opening and closing of the floating ball valve (8) is controlled by the liquid level in the medicine pool (6); the plate (2) has a plurality of piston chambers ( 9), the piston chamber (9) has a vertically sliding piston (10) and piston rod (11), the upper end of the piston rod (11) slides through the plate (2), and the lower end of the piston rod (11) is connected to the The piston (10) is connected, and there is a spring (12) placed above the piston (10) in the piston chamber (9). The two ends of the spring (12) are respectively in contact with the plate (2) and the piston (10). Under the action of elastic force, the piston (10) drives the piston rod (11) to slide downward at the same time; the lower part of the piston chamber (9) communicates with the upper part of the pool (5) through the hose (13), and the flat plate ( 2) There are multiple pressure relief valves (14) connected to the piston chamber (9) in one-to-one correspondence. The opening and closing of the pressure relief valve (14) is controlled by the vertical position of the piston rod (11), so that the piston chamber ( 9) The pressure inside is continuously accumulated and released, so that the piston (10) drives the piston rod (11) to reciprocate vertically; There are several vertical air holes (15) on the periphery of the cushion (3), and the lower end of the air holes (15) communicates with the top of the medicine pool (6) via a conduit (16). 2. The traditional Chinese medicine fumigation and massage device according to claim 1, characterized in that the medicinal pool (6) is connected to the base (1) via threads. 3. The traditional Chinese medicine fumigation massage device according to claim 1, characterized in that there is a vertical chute (17) placed above the medicine pool (6) on the base (1), and the upper part of the pool (5) and the vertical The chute (17) communicates with the passage (7), and the inner tube (18) sliding in the vertical chute (17) is arranged on the base (1), and the upper end of the inner tube (18) is closed and provided with The channel (7) corresponds to the matching water inlet hole (19). The lower end of the inner pipe (18) has a floating ball (20) placed below the vertical chute (17) and a ball placed between the vertical chute (17) and the floating ball. (20) between the outlet holes (21). 4. The traditional Chinese medicine fumigation massage device according to claim 1, characterized in that, there is a through hole (22) vertically penetrating the piston (10) on the piston (10), and there is a through hole (22) on the piston rod (11). ) connected blind hole (23); the piston rod (11) is provided with a vertically arranged keyway (24), and the plate (2) has an accommodating groove (25) corresponding to the keyway (24). There is a vertically sliding flat key (26) in the keyway (24), and a part of the flat key (26) is placed in the accommodation groove (25) and is frictionally and slidably connected with the accommodation groove (25); the keyway The groove bottom of (24) is provided with the vertical straight groove (27) that communicates with blind hole (23), and the through hole (28) corresponding with straight groove (27) is arranged on the flat key (26), and straight groove (27) The length is greater than the sliding distance of the flat key (26) in the keyway (24); the upper part of the groove bottom of the accommodating groove (25) is provided with a pressure relief hole (29) communicating with the space below the flat plate (2). 5. The traditional Chinese medicine fumigation and massage device according to claim 1, characterized in that there is a hollow interlayer (30) arranged horizontally on the flat plate (2), and the pressure relief valve (14) is placed in the interlayer (30). There is a drain hole (31) connected to the interlayer (30) on the flat plate (2), and a drain pipe (32) connected to the drain hole (31) is arranged under the flat plate (2). 6. The traditional Chinese medicine fumigation and massage device according to claim 1, characterized in that there is an inner cavity (33) placed below the air holes (15) on the flat plate (2) and arranged around along the distribution direction of the air holes (15), so that The air hole (15) communicates with the inner cavity (33), and the upper part of the drug pool (6) communicates with the inner cavity (33) through a plurality of conduits (16). 7. The traditional Chinese medicine fumigation and massage device according to claim 1, characterized in that the base (1) has a steam chamber (34) and a medicine gas chamber (35) respectively placed above the water pool (5) and medicine pool (6). ), the lower end surfaces of the steam chamber (34) and the medicine gas chamber (35) respectively have a number of ventilation holes (36), and the steam in the water pool (5) and the medicine gas in the medicine pool (6) pass through the ventilation holes (36) respectively. Enter the steam chamber (34) and the medicine gas chamber (35); the piston chamber (9) communicates with the steam chamber (34) through the hose (13), the air hole (15) and the medicine gas chamber (35) through the catheter (16) CONNECTED. 8. The traditional Chinese medicine fumigation and massage device according to claim 1, characterized in that there is a backflow tank (37) arranged around the outer edge of the cushion (3) on the flat plate (2) and a backflow tank (37) communicating with the backflow tank (37). A plurality of return holes (38) arranged vertically. 9. The traditional Chinese medicine fumigation massage device according to claim 1, characterized in that there is a water injection port (39) on the pool (5). 10. The traditional Chinese medicine fumigation and massage device according to claim 1, characterized in that the left end of the gas gathering hood (4) is a closed structure, and the right end of the gas gathering hood (4) has a curtain (40).