Gas blower with sealing structure

Abstract

The invention discloses a gas blower with a sealing structure, and relates to the technical field of gas blowers, the gas blower comprises a casing and an exhaust assembly, and the exhaust assembly is embedded in the rear end of the interior of the casing. In the using process, the exhaust assembly operates without external power supply, on one hand, a key protrusion in the middle of the main shaft drives the piston plate with the middle hole provided with a key groove to rotate synchronously, on the other hand, the piston plate moves on the inclined annular plate through a ball on the disc face at the rear end, and reciprocating telescopic movement is synchronously achieved while the piston plate rotates; the sleeve serves as a pump cylinder, pressure difference is generated in a pump cavity in the reciprocating stretching and retracting process of the piston plate, coal gas escaping from the buffer cavity is actively sucked into the pump cavity and directionally flows back into a gas cavity, the problem that the coal gas is detained and accumulated in the buffer cavity is effectively solved, design is novel, linkage is high, and operation is convenient. Through creative improvement on the technical scheme of the existing balance pipe, the problem of function failure caused by easy blockage of the external balance pipe in the prior art is more effectively solved.

Description

Technical Field

[0001] The invention relates to the technical field of gas blowers, in particular to a gas blower provided with a sealing structure. Background Art

[0002] In the recycling and purification workshop of the coking enterprise, a large gas blower is used in the condensing and blowing section. Its main function is to extract the gas from the coke oven and send it to the subsequent section for further processing. Since the coke oven gas contains about 5% carbon monoxide, which is harmful to the human body and is flammable and explosive, the sealing of the gas blower is very important as the main equipment for transporting coke oven gas.

[0003] The existing gas blower is a sealed device with an air inlet and an air outlet. An impeller fixed on the central main shaft is installed in the internal air cavity. The rotation of the impeller generates an air pressure difference to cause the blower to exhaust air. During use, due to the high pressure, the main shaft needs to rotate but is not fixedly connected to the casing, and it is inevitable that gas leaks from the place where the main shaft rotates. Therefore, for the purpose of sealing, this type of gas blower is provided with two sealing measures. The first is a front seal at the connection between the impeller and the shaft, and the second is a rear seal at the rotational contact between the main shaft and the rear side wall of the casing. A cavity is provided in the gap between the opposite surfaces of the front seal and the rear seal, which is called a buffer cavity in the industry. The prior art provides a balance pipe at the bottom of the buffer cavity to reintroduce the leaked gas into the air inlet. However, since the balance pipe needs to extend to the outside of the casing and return the leaked gas to the air inlet, there is a problem of functional failure due to easy blockage. At this time, the machine must be shut down and the entire blower must be disassembled for cleaning before it can be used again, which requires a lot of manpower and material resources.

[0004] Therefore, in view of this, the shortcomings of the existing structure are studied and improved, and a gas blower with a sealing structure is proposed. Summary of the invention

[0005] The object of the present invention is to provide a gas blower with a sealing structure to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a gas blower with a sealing structure, comprising a casing and an exhaust assembly, wherein the exhaust assembly is embedded in the rear end of the casing, and the exhaust assembly comprises a sleeve, a pump chamber, a one-way air inlet, a throat, a cross, a one-way diaphragm, a fixing pin, an inclined ring plate, a piston plate, a ball, a retaining frame and a steel ball, wherein the sleeve is fixed to the rear side wall of the casing, and an axially arranged pump chamber is provided inside the sleeve, and a one-way air inlet is provided on the side wall of the diffuser at the rear end of the pump chamber A throat is provided at the middle connection of the diffusers at the front and rear ends of the pump chamber, and a cross is fixed on the inner wall of the throat, and a one-way diaphragm that can only be folded toward the front end is connected to the end of the cross away from the diffuser at the rear end of the pump chamber, a fixing pin is protruding from the rear side wall of the pump chamber, and the fixing pin is fixed to the inclined ring plate, a piston plate is slidably installed inside the diffuser at the rear end of the pump chamber, and a ball is provided on the disk surface of the piston plate facing the inclined ring plate, a retaining frame is fixed on the inner wall of the diffuser at the front end of the pump chamber, and a steel ball is rollingly fitted in the recess in the middle of the retaining frame.

[0007] Furthermore, the rear end of the casing is fixed to the rear side plate, and an air cavity is opened inside the casing, the air inlet at the front end of the air cavity is connected to the coke oven through a flange, and the air outlet at the side end of the air cavity is connected to the gas pipeline through a flange.

[0008] Furthermore, a main shaft is rotatably mounted inside the housing, and the diameter of the main shaft is smaller than the diameter of the hole in the inclined ring plate.

[0009] Furthermore, the front end sleeve of the main shaft is provided with an impeller, and the middle sleeve of the impeller is rotatably matched with the retaining frame of the front end diffuser of the pump chamber through a steel ball, and the middle sleeve array of the impeller is provided with a vent hole connected to the front end diffuser of the pump chamber, and the impeller is fastened to the front end of the main shaft through a locking nut.

[0010] Furthermore, a key protrusion is fixed to the array of the side wall in the middle of the main shaft, and the key protrusion matches the key groove on the inner wall of the hole in the piston plate.

[0011] Furthermore, a fan blade is coaxially fixed to the rear end of the main shaft, and the main shaft is transmission-connected to the motor through a bearing box.

[0012] Furthermore, a buffer cavity is opened at the rear end of the air cavity, and the buffer cavity is located between the gap between the impeller and the rear side wall of the casing, and the buffer cavity is connected with the rear diffuser of the pump cavity through a one-way air inlet.

[0013] Furthermore, a sealing sleeve is fixed to the outer flange of the casing, and radial comb teeth are embedded inside the sealing sleeve, and concave labyrinth channels are provided between adjacent radial comb teeth.

[0014] Furthermore, a heat dissipation component is fixed to the flange of one end of the sealing sleeve facing away from the casing, and the heat dissipation component includes a sleeve, a guide cone and an air outlet groove. The inner wall of the front end of the sleeve is provided with a guide cone, and the end vertical surface of the guide cone corresponds to the outlet of the maze channel, and an air outlet groove is radially provided at the bottom end of the guide cone.

[0015] Furthermore, the heat dissipation component also includes a partition and a through hole. The partition is fixed to the inner wall of the middle end of the sleeve, and a through hole is axially opened at the top of the partition, and a fan blade is correspondingly arranged at the rear end of the seat hole in which the partition and the main shaft are clearance-matched.

[0016] The present invention provides a gas blower with a sealing structure, which has the following beneficial effects:

[0017] 1. During the use of the present invention, the present application allows the gas escaping from the buffer cavity to flow back directly to the air cavity through the exhaust assembly, without connecting a balance pipe to the outside of the casing, and avoids the existing technical shortcomings of gas retention or even escape caused by blockage of the external balance pipe by shortening the gas return stroke. In addition, the operation of the exhaust assembly does not rely on external power supply. On the one hand, the piston plate with a keyway in the middle hole is driven to rotate synchronously by the key convex in the middle of the main shaft, and on the other hand, the piston plate is located on the inclined ring plate through the movement of the rear end disk ball, and reciprocating telescopic motion is realized synchronously while the piston plate rotates. The sleeve is used as a pump cylinder, and a pressure difference is generated in the pump cavity during the reciprocating telescopic process of the piston plate, so that the gas escaping from the buffer cavity is actively sucked into the pump cavity and directed back to the inside of the air cavity, effectively solving the problem of gas retention and accumulation in the buffer cavity. The design is novel and has strong linkage. By making creative improvements on the existing balance pipe technical solution, it is more effective to solve the problem of functional failure of the external balance pipe in the prior art due to easy blockage.

[0018] 2. During the use of the present invention, on the other hand, by coaxially fixing the fan blades at the rear end of the main shaft, the high-speed airflow will form a wind curtain at the outlet of the maze channel, which can further prevent the escape of gas from the outlet of the maze channel, and further optimize the sealing effect on the basis of the existing maze sealing technical solution. When the high-speed airflow passes through the outer edge of the main shaft, it will take away the heat on the main shaft, isolate the heat transmitted to the bearing box by the high-temperature medium extracted from the coke oven, and ensure the long-term stable and safe operation of the fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the device of the present invention;

[0020] Figure 2 It is a schematic diagram of the explosion structure of the device of the present invention;

[0021] Figure 3 It is a schematic diagram of the cross-sectional structure of the device of the present invention;

[0022] Figure 4 It is a schematic diagram of the front view structure of the device of the present invention;

[0023] Figure 5 It is a schematic diagram of the exhaust assembly structure of the present invention;

[0024] Figure 6 This is a schematic diagram of the sealing sleeve structure of the present invention;

[0025] Figure 7 It is a schematic diagram of the structure of the heat dissipation component of the present invention.

[0026] In the figure: 1, casing; 2, rear side plate; 3, air cavity; 4, main shaft; 5, impeller; 6, vent hole; 7, locking nut; 8, key convex; 9, fan blade; 10, bearing box; 11, buffer cavity; 12, exhaust assembly; 1201, sleeve; 1202, pump cavity; 1203, one-way air inlet; 1204, throat; 1205, cross; 1206, one-way diaphragm; 1207, fixing pin; 1208, inclined ring plate; 1209, piston plate; 1210, ball; 1211, retaining frame; 1212, steel ball; 13, sealing sleeve; 14, radial comb teeth; 15, labyrinth passage; 16, heat dissipation assembly; 1601, sleeve; 1602, guide cone; 1603, air outlet groove; 1604, partition; 1605, through hole. DETAILED DESCRIPTION

[0027] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following embodiments are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0028] See also Figures 1 to 5The present invention provides a technical solution: a gas blower with a sealing structure, comprising a casing 1 and an exhaust assembly 12, wherein the rear end of the casing 1 is fixed to the rear side plate 2, and an air cavity 3 is opened inside the casing 1, the front air inlet of the air cavity 3 is connected to the coke oven through a flange, and the side air outlet of the air cavity 3 is connected to the gas pipeline through a flange, a main shaft 4 is rotatably installed inside the casing 1, and the diameter of the main shaft 4 is smaller than the hole diameter of the inclined ring plate 1208, an impeller 5 is sleeved at the front end of the main shaft 4, and the middle shaft sleeve of the impeller 5 is rotatably matched with the retaining frame 1211 of the front diffuser of the pump chamber 1202 through a steel ball 1212, and the middle shaft sleeve array of the impeller 5 A vent hole 6 is provided which is connected to the front diffuser of the pump chamber 1202. The impeller 5 is fastened to the front end of the main shaft 4 through a locking nut 7. A key convex 8 is fixed to the middle side wall array of the main shaft 4, and the key convex 8 cooperates with the key groove of the inner wall of the hole in the piston plate 1209. A fan blade 9 is coaxially fixed to the rear end of the main shaft 4, and the main shaft 4 is connected to the motor through a bearing box 10. A buffer cavity 11 is provided at the rear end of the air cavity 3, and the buffer cavity 11 is located between the gap between the impeller 5 and the rear side wall of the casing 1, and the buffer cavity 11 is connected to the rear diffuser of the pump chamber 1202 through a one-way air inlet 1203. An exhaust component 1 is embedded in the rear end of the casing 1. 2. The exhaust assembly 12 includes a sleeve 1201, a pump chamber 1202, a one-way air inlet 1203, a throat 1204, a cross 1205, a one-way diaphragm 1206, a fixing pin 1207, an inclined ring plate 1208, a piston plate 1209, a ball 1210, a retainer 1211 and a steel ball 1212. The sleeve 1201 is fixed to the rear side wall inside the housing 1, and the sleeve 1201 is provided with an axially arranged pump chamber 1202, and the side wall of the rear end diffuser of the pump chamber 1202 is provided with a one-way air inlet 1203, and the middle connection of the diffusers at the front and rear ends of the pump chamber 1202 is provided with a throat 1204, and the throat A cross 1205 is fixed to the inner wall of 1204, and the end of the cross 1205 away from the rear diffuser of the pump chamber 1202 is connected to a one-way diaphragm 1206 that can only be folded toward the front end, a fixing pin 1207 is protruding from the rear side wall of the pump chamber 1202, and the fixing pin 1207 is fixed to the inclined ring plate 1208, a piston plate 1209 is slidably installed inside the rear diffuser of the pump chamber 1202, and a ball 1210 is provided on the disk surface of the piston plate 1209 facing the side of the inclined ring plate 1208, a retainer 1211 is fixed to the inner wall of the front diffuser of the pump chamber 1202, and a steel ball 1212 is rollingly fitted in the middle recess of the retainer 1211;

[0029] The specific operation is as follows: on the one hand, the main shaft 4 drives the front impeller 5 to rotate to create a pressure difference between the air inlet and the air outlet connected to the air cavity 3, so as to extract the gas from the coke oven and send it to the subsequent section for further processing through the gas pipeline. In the above process, it is inevitable that the gas leaks from the place where the impeller 5 rotates and further enters the buffer cavity 11 arranged around the main shaft 4 between the two seals. The present application fixes a sleeve 1201 on the rear side wall of the casing 1, and the front end opening of the sleeve 1201 is connected with the rotating impeller 5 sleeve through the steel ball 1212 to establish a reflux passage, and is installed on the rear side wall of the pump cavity 1202 through the fixing pin 1207. The inclined ring plate 1208 is installed. When in use, the main shaft 4 drives the piston plate 1209 to rotate synchronously through the cooperation between the middle key protrusion 8 and the key groove in the middle hole of the piston plate 1209. During the rotation of the piston plate 1209, the ball 1210 is located on the disk surface of the inclined ring plate 1208, so that the piston plate 1209 can be synchronously extended and retracted forward and backward during the rotation, and the gas stored in the buffer cavity 11 is sucked into the rear end of the pump cavity 1202. Under the action of the one-way diaphragm 1206 in the throat 1204 in the middle of the pump cavity 1202 that can only be folded toward the front end, the gas is directionally discharged into the front end of the pump cavity 1202 and passes through the retaining frame 1211 The gap between adjacent balls 1210 enters the air vent 6 set in the impeller 5 sleeve, and then the escaped gas is directly returned to the air cavity 3. The present application makes the gas escaping from the buffer cavity 11 return to the air cavity 3 directly through the exhaust component 12, without connecting a balance pipe to the outside of the casing 1. The gas reflux stroke is shortened to avoid the shortcomings of the prior art that the gas is retained or even escaped due to the blockage of the external balance pipe. In addition, the operation of the exhaust component 12 does not rely on external power supply. On the one hand, the key convex 8 in the middle of the main shaft 4 drives the piston plate 1209 with a key groove in the middle hole to rotate synchronously. On the other hand, the piston plate 1209 passes through the rear The end plate ball 1210 moves on the inclined ring plate 1208, and synchronously realizes reciprocating telescopic motion while the piston plate 1209 rotates. The sleeve 1201 is used as a pump cylinder, and a pressure difference is generated in the pump chamber 1202 during the reciprocating telescopic process of the piston plate 1209, so that the gas escaping from the buffer cavity 11 is actively sucked into the pump chamber 1202 and directed back to the inside of the gas cavity 3, effectively solving the problem of gas retention and accumulation in the buffer cavity 11. The design is novel and has strong linkage. By making creative improvements on the existing balance pipe technical solutions, it is more effective to solve the problem of functional failure of the external balance pipe in the existing technology due to easy blockage;

[0030] See also Figure 6 to Figure 7A sealing sleeve 13 is fixed to the outer flange of the casing 1, and radial comb teeth 14 are inlaid inside the sealing sleeve 13, and a concave labyrinth channel 15 is provided between adjacent radial comb teeth 14. A heat dissipation component 16 is fixed to the flange of the sealing sleeve 13 at one end away from the casing 1. The heat dissipation component 16 includes a sleeve 1601, a guide cone 1602 and an air outlet groove 1603. A guide cone 1602 is provided on the inner wall of the front end of the sleeve 1601, and the end vertical surface of the guide cone 1602 corresponds to the outlet of the labyrinth channel 15, and an air outlet groove 1603 is radially provided at the bottom end of the guide cone 1602. The heat dissipation component 16 also includes a partition 1604 and a through hole 1605. A partition 1604 is fixed to the inner wall of the middle end of the sleeve 1601, and a through hole 1605 is axially provided at the top end of the partition 1604, and a fan blade 9 is correspondingly provided at the rear end of the seat hole in which the partition 1604 and the main shaft 4 are clearance-matched;

[0031] The specific operation is as follows. During use, it is inevitable that gas will escape from the rear seal where the main shaft 4 rotates and contacts with the rear side wall of the casing 1. Therefore, the present application is connected with a sealing sleeve 13 on the outside of the rear side plate 2 through a flange. An inwardly concave labyrinth channel 15 is provided between adjacent radial comb teeth 14 in the sealing sleeve 13. When the gas passes through the labyrinth channel 15, a throttling effect will be generated to achieve the purpose of preventing leakage. On the other hand, the present application fixes a fan blade 9 coaxially at the rear end of the main shaft 4. When the main shaft 4 rotates, the fan blade 9 rotates synchronously and outputs the wind through the top of the partition 1604. The axially opened through hole 1605 leads to the front end of the sleeve 1601, and finally passes through the air outlet groove 1603 under the action of the guide cone 1602. The high-speed airflow here will form a wind curtain at the outlet of the maze channel 15, which can further prevent the escape of coal gas from the outlet of the maze channel 15, and further optimize the sealing effect on the basis of the existing maze sealing technical solution. When the high-speed airflow passes through the outer edge of the main shaft 4, it will take away the heat on the main shaft 4, and isolate the heat transmitted from the high-temperature medium extracted from the coke oven to the bearing box 10, thereby ensuring the long-term stable and safe operation of the fan.

[0032] In summary, when the gas blower with a sealing structure is used, the main shaft 4 drives the front impeller 5 to rotate, causing a pressure difference between the air inlet and the air outlet connected to the air cavity 3, so as to extract the gas from the coke oven and send it to the subsequent section for further processing through the gas pipeline. In the above process, it is inevitable that the gas leaks from the place where the impeller 5 rotates and further enters the buffer cavity 11 arranged around the main shaft 4 between the two seals. The present application fixes a sleeve 1201 on the rear side wall of the casing 1, and the front end opening of the sleeve 1201 is connected with the rotating impeller 5 sleeve through the steel ball 1212 to establish a reflux passage, and an inclined ring plate 1208 is installed on the rear side wall of the pump cavity 1202 through the fixing pin 1207. When in use, the main shaft 4, on the other hand, passes through the middle The cooperation between the key protrusion 8 and the keyway in the hole of the piston plate 1209 drives the piston plate 1209 to rotate synchronously. During the rotation of the piston plate 1209, the ball 1210 moves on the surface of the inclined ring plate 1208, so that the piston plate 1209 can synchronously extend and retract forward and backward during the rotation, and the gas stored in the buffer cavity 11 is sucked into the rear end of the pump cavity 1202. Under the action of the one-way diaphragm 1206 that can only be folded toward the front end at the throat 1204 in the middle of the pump cavity 1202, the gas is directionally discharged into the front end of the pump cavity 1202 and enters the air vent 6 set in the impeller 5 sleeve through the gap between the adjacent balls 1210 in the retaining frame 1211, thereby directly returning the escaped gas to the air cavity 3. The gas directly flows back to the air cavity 3 through the exhaust component 12, and there is no need to connect a balance pipe to the outside of the casing 1. The gas return stroke is shortened to avoid the shortcomings of the existing technology that the gas is retained or even escaped due to the blockage of the external balance pipe. In addition, the operation of the exhaust component 12 does not rely on external power supply. On the one hand, the key convex 8 in the middle of the main shaft 4 drives the piston plate 1209 with a key groove in the middle hole to rotate synchronously. On the other hand, the piston plate 1209 moves on the inclined ring plate 1208 through the rear end disk ball 1210. While the piston plate 1209 rotates, it realizes reciprocating telescopic motion synchronously. The sleeve 1201 is used as a pump cylinder. During the reciprocating telescopic process of the piston plate 1209, a pressure difference is generated in the pump cavity 1202, so that the gas escaping from the buffer cavity 11 is actively sucked in. The pump cavity 1202 is directed to flow back to the inside of the air cavity 3, which effectively solves the problem of gas accumulation in the buffer cavity 11. The design is novel and has strong linkage. By making creative improvements on the existing balance pipe technical solutions, it is more effective to solve the problem of the external balance pipe in the prior art being easily blocked and causing functional failure. During use, it is inevitable that gas will escape from the rear seal at the rotational contact between the main shaft 4 and the rear side wall of the casing 1. Therefore, the present application is connected to the outside of the rear side plate 2 by a flange with a sealing sleeve 13, and an inwardly concave labyrinth channel 15 is provided between adjacent radial comb teeth 14 in the sealing sleeve 13. When the gas passes through the labyrinth channel 15, a throttling effect will be generated, thereby achieving the purpose of preventing leakage. On the other hand, the present application fixes a fan blade 9 coaxially at the rear end of the main shaft 4.When the main shaft 4 rotates, the fan blades 9 rotate synchronously and transmit the output wind force to the front end of the sheath 1601 through the through hole 1605 axially opened at the top of the partition 1604, and finally pass through the air outlet groove 1603 under the action of the guide cone 1602. The high-speed airflow will form a wind curtain at the outlet of the labyrinth channel 15, which can further prevent the gas from escaping from the outlet of the labyrinth channel 15. The sealing effect is further optimized on the existing labyrinth sealing technical solution, and the high-speed airflow will take away the heat on the main shaft 4 when passing through the outer edge of the main shaft 4, isolating the heat transmitted from the high-temperature medium extracted from the coke oven to the bearing box 10, ensuring the long-term stable and safe operation of the fan.

[0033] The embodiments of the present invention are given for the purpose of illustration and description, and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention and to enable those of ordinary skill in the art to understand the present invention and thereby design various implementations with various modifications suitable for specific uses.

Claims

1. A gas blower with a sealing structure, characterized in that: The invention comprises a casing (1) and an exhaust assembly (12), wherein the casing (1) is embedded with an exhaust assembly (12) at the rear end thereof, wherein the exhaust assembly (12) comprises a sleeve (1201), a pump chamber (1202), a one-way air inlet (1203), a throat (1204), a cross (1205), a one-way diaphragm (1206), a fixing pin (1207), an inclined ring plate (1208), a piston plate (1209), a ball (1210), a retaining frame (1211) and a steel ball (1212), wherein the sleeve (1201) is fixed to the rear side wall of the casing (1), and an axially arranged pump chamber (1202) is provided inside the sleeve (1201), and a one-way air inlet (1203) is provided on the side wall of the rear diffuser of the pump chamber (1202), and the front and rear ends of the pump chamber (1202 diffuser are provided with a one-way air inlet (1203). A throat (1204) is provided at the middle connection of the diffuser, and a cross (1205) is fixed on the inner wall of the throat (1204), and one end of the cross (1205) away from the rear diffuser of the pump chamber (1202) is connected to a one-way diaphragm (1206) that can only be folded toward the front end, a fixing pin (1207) protrudes from the rear side wall of the pump chamber (1202), and the fixing pin (1207) is fixed to the inclined ring plate (1208), a piston plate (1209) is slidably installed inside the rear diffuser of the pump chamber (1202), and a ball (1210) is provided on the disk surface of the piston plate (1209) facing the inclined ring plate (1208), a retaining frame (1211) is fixed on the inner wall of the front diffuser of the pump chamber (1202), and a steel ball (1212) is rollingly fitted in the middle recess of the retaining frame (1211).

2. A gas blower with a sealing structure according to claim 1, characterized in that: The rear end of the casing (1) is fixed to the rear side plate (2), and an air cavity (3) is provided inside the casing (1). The front air inlet of the air cavity (3) is connected to the coke oven via a flange, and the side air outlet of the air cavity (3) is connected to the gas pipeline via a flange.

3. A gas blower with a sealing structure according to claim 1, characterized in that: A main shaft (4) is rotatably mounted inside the housing (1), and the diameter of the main shaft (4) is smaller than the diameter of the hole in the inclined ring plate (1208).

4. A gas blower with a sealing structure according to claim 3, characterized in that: The front end of the main shaft (4) is sleeved with an impeller (5), and the middle sleeve of the impeller (5) is rotatably matched with a retaining frame (1211) of the front diffuser of the pump chamber (1202) through a steel ball (1212), and the middle sleeve array of the impeller (5) is provided with a vent hole (6) connected to the front diffuser of the pump chamber (1202), and the impeller (5) is fastened to the front end of the main shaft (4) through a locking nut (7).

5. A gas blower with a sealing structure according to claim 3, characterized in that: A key protrusion (8) is fixed to the array of the middle side walls of the main shaft (4), and the key protrusion (8) matches the key groove on the inner wall of the hole in the piston plate (1209).

6. A gas blower with a sealing structure according to claim 3, characterized in that: A fan blade (9) is coaxially fixed to the rear end of the main shaft (4), and the main shaft (4) is transmission-connected to the motor via a bearing box (10).

7. A gas blower with a sealing structure according to claim 2, characterized in that: A buffer cavity (11) is provided at the rear end of the air cavity (3), and the buffer cavity (11) is located between the gap between the impeller (5) and the rear side wall of the casing (1), and the buffer cavity (11) is connected to the rear end diffusion channel of the pump cavity (1202) through a one-way air inlet (1203).

8. The gas blower with a sealing structure according to claim 1, characterized in that: A sealing sleeve (13) is fixed to the outer flange of the casing (1), radial comb teeth (14) are embedded inside the sealing sleeve (13), and concave labyrinth channels (15) are provided between adjacent radial comb teeth (14).

9. A gas blower with a sealing structure according to claim 8, characterized in that: A heat dissipation component (16) is fixed to a flange at one end of the sealing sleeve (13) facing away from the housing (1), and the heat dissipation component (16) comprises a sleeve (1601), a guide cone (1602) and an air outlet groove (1603). The inner wall of the front end of the sleeve (1601) is provided with a guide cone (1602), and the end vertical surface of the guide cone (1602) corresponds to the outlet of the labyrinth channel (15), and the bottom end of the guide cone (1602) is provided with an air outlet groove (1603) in a radial direction.

10. A gas blower with a sealing structure according to claim 9, characterized in that: The heat dissipation component (16) further comprises a partition (1604) and a through hole (1605); the partition (1604) is fixed to the inner wall of the middle end of the sleeve (1601); the through hole (1605) is axially provided at the top end of the partition (1604); and a fan blade (9) is correspondingly provided at the rear end of the seat hole in which the partition (1604) and the main shaft (4) are clearance-matched.

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