Hydrogen storage tank

Abstract

The invention relates to the technical field of storage tanks, in particular to a hydrogen storage tank which comprises a tank body, a slow release assembly is arranged at the upper end of a conveying tank body, a pressurizing assembly is arranged in the tank body, a conveying assembly is arranged on the slow release assembly and the pressurizing assembly, a protection assembly is arranged outside the tank body, and the slow release assembly comprises a fixing ring. The fixing ring is embedded in the center of the outer wall of the upper end of the tank body and connected with the one-way air inlet pipe and the one-way exhaust pipe through the cylinder and the conveying cavity respectively, the two control valves are opened, and therefore it can be guaranteed that when the cylinder conveys hydrogen into the tank body, pressurized gas in the pressurized air bag can be exhausted through the conveying cavity; and when the conveying cavity injects pressurized gas into the pressurized air bag again, the cylinder can discharge hydrogen in the tank body, so that the situation that two kinds of gas are input into the tank body simultaneously due to errors of an operator can be prevented, and the situation that the tank body is damaged and leaks due to the fact that the pressure in the tank body is too large due to operation errors can be prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of storage tanks, in particular to a hydrogen storage tank. Background Art

[0002] Hydrogen storage tanks are equipment used to store hydrogen. They are widely used in all links of the hydrogen energy industry chain, including the production, storage, transportation and use of hydrogen. With the development of hydrogen energy technology, the design and technology of hydrogen storage tanks are also constantly improving to meet the needs of different application scenarios. Hydrogen is a flammable and explosive gas, so the design and manufacture of hydrogen storage tanks need to take safety into consideration. The storage tank should have good sealing and pressure resistance to prevent hydrogen leakage and explosion.

[0003] When the existing hydrogen storage tanks are charged and discharged, in order to completely discharge the hydrogen inside the tank, a boosting component needs to be set to assist the discharge of hydrogen. However, when the two stored materials are alternately charged and discharged, the flow speed of the two stored materials needs to be controlled. However, the existing hydrogen storage tanks control the flow direction of the gas through a control valve. If the control valve direction is wrong during charging and discharging, the pressure inside the tank will surge, which can easily cause the tank to be damaged and leak. Moreover, the existing hydrogen storage tanks are all high-pressure tanks. When the hydrogen is released, the pressure inside the tank is too high, which can easily impact the pipeline and cause pipeline leakage. Summary of the invention

[0004] In view of the problems in the prior art, the present invention provides a hydrogen storage tank.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a hydrogen storage tank comprises a tank body, a slow-release component is arranged on the upper end of the conveying tank body, a pressurizing component is arranged inside the tank body, a conveying component is arranged on the slow-release component and the pressurizing component, and a protective component is arranged outside the tank body; The slow-release assembly comprises a fixing ring, which is embedded in the center of the upper outer wall of the tank body, a cylinder is fixedly sleeved inside the fixing ring, a connecting pipe is fixedly connected to the outer wall of the cylinder, a rotating shaft is rotatably connected to the outer wall of the upper end of the cylinder, a cylinder cover is fixedly connected to the lower end of the rotating shaft, an arc-shaped opening is provided on the outer wall of the cylinder cover, an arc-shaped notch is provided on the outer wall of the lower end of the cylinder, a sealing ring is fixedly sleeved on the upper end surface of the rotating shaft, the sealing ring is clamped on the inner wall of the upper end of the cylinder, and a rotating rod is fixedly connected to the uppermost end of the rotating shaft; The booster assembly includes a plurality of connecting plates, which are symmetrically fixedly connected to the inner wall of the tank body, the other end of the connecting plate is fixedly connected to the same airbag column, the inner wall of the airbag column is fixedly connected to a booster airbag, the lower end of the airbag column is provided with a delivery cavity, the inner wall of the delivery cavity is provided with a plurality of air holes, an L-shaped tube is fixedly sleeved on the inner wall of the lower end of the delivery cavity, and the other end of the L-shaped tube passes through the outer wall of the tank body and extends to the outside; The conveying assembly includes two control valves, which are fixedly connected to the connecting pipe and the L-shaped pipe respectively, and the other ends of the control valves are fixedly connected to the conveying pipes, and a fixing seat is fixedly sleeved on the surface of the other end of the conveying pipes, a stabilizing shaft is rotatably connected to the center of the fixing seat, and a rotating cover is fixedly connected to the upper end of the stabilizing shaft, and a one-way air intake pipe and a one-way exhaust pipe are embedded in the rotating cover, a fixing block is fixedly connected to the outer wall of the fixing seat, and two clamping blocks are fixedly connected to the upper surface of the fixing block, and two side plates are symmetrically fixedly connected to the outer wall of the rotating cover, and the same round block is fixedly connected to the side plates, and a rotating block is rotatably connected to the surface of the round block, and the rotating block is clamped between the two clamping blocks.

[0006] The protection assembly includes two clamping rings, which are respectively clamped on the outer walls of the upper and lower ends of the tank body, and the outer walls of the clamping rings are equidistantly fixed with fixing rods, the other end of the fixing rod located at the lower end of the tank body is fixedly connected to a protective tube, and the other end of the fixing rod located at the upper end of the tank body is fixedly connected to a clamping tube, the clamping tube is clamped inside the protective tube, the outer wall of the protective tube is provided with a clamping groove, the clamping groove is clamped on the surface of the L-shaped tube, a plurality of arc-shaped grooves are provided on the upper surface of the clamping tube, a first plug hole is symmetrically provided on the outer wall of the clamping tube, and a second plug hole is symmetrically provided on the outer wall of the tank body, the same L-shaped plug rod is inserted into the inside of the first plug hole and the second plug hole, and two L-shaped blocks are fixedly connected to the outer wall of the tank body, and the L-shaped plug rod is clamped inside the L-shaped block.

[0007] Specifically, the arc-shaped opening corresponds to the arc-shaped notch, and both the arc-shaped opening and the arc-shaped notch are arranged around the rotating shaft.

[0008] Specifically, the cylinder cover is clamped on the outer wall of the lower end of the cylinder, and the upper surface of the cylinder cover matches the inner wall of the upper end of the tank body.

[0009] Specifically, the sealing ring is located at the upper end of the connecting pipe, and the upper surface of the sealing ring and the inner wall of the upper end of the cylinder are pressed against each other.

[0010] Specifically, the one-way air intake pipe and the one-way exhaust pipe correspond to the two delivery pipes, and the one-way air intake pipe and the one-way exhaust pipe are tightly fitted with the two delivery pipes.

[0011] Beneficial effects of the present invention: (1) The hydrogen storage tank described in the present invention is connected to a one-way air inlet pipe and a one-way air exhaust pipe through a cylinder and a delivery chamber, respectively. By opening the two control valves, it is ensured that when the cylinder delivers hydrogen to the interior of the tank, the delivery chamber will discharge the pressurized gas in the pressurized airbag, and when the delivery chamber injects pressurized gas into the pressurized airbag, the cylinder will discharge the hydrogen in the tank. This can prevent the operator from making a mistake and causing two gases to be input into the tank at the same time, and can prevent the tank from being damaged and leaked due to excessive internal pressure caused by operating errors.

[0012] (2) The hydrogen storage tank described in the present invention drives the rotating shaft to rotate through the rotating rod, and the rotating shaft will drive the cylinder cover to rotate. When the cylinder cover rotates, the arc opening and the arc notch will correspond to each other. By controlling the overlap size of the arc opening and the arc notch, the flow rate of the hydrogen in the cylinder can be controlled, thereby reducing the pressure of the gas in the pipeline and preventing the pipeline from being damaged due to excessive pressure in the tank body pushing the gas to squeeze the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0014] Figure 1 A schematic diagram of the internal structure of the hydrogen storage tank provided by the present invention; Figure 2 A schematic diagram of the external structure of the hydrogen storage tank provided by the present invention; Figure 3 A schematic diagram of the protective tube structure of the hydrogen storage tank provided by the present invention; Figure 4 A schematic diagram of the structure of the pressurized airbag of the hydrogen storage tank provided by the present invention; Figure 5 A schematic diagram of the structure of the delivery assembly of the hydrogen storage tank provided by the present invention; Figure 6 A schematic diagram of the structure of a slow-release assembly of a hydrogen storage tank provided by the present invention; Figure 7 This is a schematic diagram of the rotating cover structure of the hydrogen storage tank provided by the present invention.

[0015] In the figure: 1, tank body; 2, slow-release assembly; 21, fixing ring; 22, cylinder; 23, connecting pipe; 24, rotating shaft; 25, cylinder cover; 26, arc opening; 27, arc notch; 28, sealing ring; 29, rotating rod; 3, booster assembly; 31, connecting plate; 32, airbag column; 33, booster airbag; 34, conveying cavity; 35, air hole; 36, L-shaped pipe; 4, conveying assembly; 41, control valve; 42, conveying pipe; 43, fixed Fixed seat; 44, stabilizing shaft; 45, rotating cover; 46, one-way air inlet pipe; 47, one-way exhaust pipe; 48, fixing block; 49, clamping block; 410, side plate; 411, round block; 412, rotating block; 5, protection assembly; 51, clamping ring; 52, fixing rod; 53, protection tube; 54, clamping groove; 55, clamping tube; 56, arc-shaped groove; 57, first plug hole; 58, second plug hole; 59, L-shaped plug rod; 510, L-shaped clamping block. DETAILED DESCRIPTION

[0016] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0017] like Figure 1-Figure 7 As shown, the hydrogen storage tank of the present invention comprises a tank body 1, a slow-release assembly 2 is arranged at the upper end of the conveying tank body 1, a pressurizing assembly 3 is arranged inside the tank body 1, a conveying assembly 4 is arranged on the slow-release assembly 2 and the pressurizing assembly 3, and a protective assembly 5 is arranged outside the tank body 1; The slow-release assembly 2 includes a fixing ring 21, which is embedded in the center of the upper outer wall of the tank body 1. A cylinder 22 is fixedly sleeved inside the fixing ring 21. A connecting pipe 23 is fixedly connected to the outer wall of the cylinder 22. A rotating shaft 24 is rotatably connected to the outer wall of the upper end of the cylinder 22. A cylinder cover 25 is fixedly connected to the lower end of the rotating shaft 24. An arc-shaped opening 26 is opened on the outer wall of the cylinder cover 25. An arc-shaped notch 27 is opened on the outer wall of the lower end of the cylinder 22. The upper end surface of the rotating shaft 24 The upper fixed sleeve is provided with a sealing ring 28, which is clamped on the inner wall of the upper end of the cylinder 22. The uppermost end of the rotating shaft 24 is fixedly connected with a rotating rod 29. When hydrogen flows through the cylinder 22, the rotating shaft 24 is driven to rotate by the rotating rod 29. When the rotating shaft 24 rotates, the cylinder cover 25 is driven to rotate. When the cylinder cover 25 rotates, the arc-shaped opening 26 is driven to correspond to the arc-shaped notch 27. By controlling the size of the overlap between the arc-shaped opening 26 and the arc-shaped notch 27, the flow rate of hydrogen in the cylinder 22 can be controlled. The booster assembly 3 includes a plurality of connecting plates 31, which are symmetrically fixedly connected to the inner wall of the tank body 1, and the other end of the connecting plate 31 is fixedly connected to the same airbag column 32, and the inner wall of the airbag column 32 is fixedly connected to a booster airbag 33, and a delivery cavity 34 is provided at the lower end of the airbag column 32, and a plurality of air holes 35 are provided on the inner wall of the delivery cavity 34, and an L-shaped tube 36 is fixedly sleeved on the inner wall of the lower end of the delivery cavity 34, and the other end of the L-shaped tube 36 extends to the outside through the outer wall of the tank body 1, when gas is injected into the L-shaped tube 36, the gas is input into the delivery cavity 34 through the L-shaped tube 36, and then the gas is input into the booster airbag 33 through the air holes 35 in the delivery cavity 34, the booster airbag 33 is expanded by the gas, and the remaining hydrogen in the tank body 1 is pushed out by the booster airbag 33; The conveying assembly 4 includes two control valves 41, which are fixedly connected to the connecting pipe 23 and the L-shaped pipe 36 respectively. The other ends of the control valves 41 are fixedly connected to the conveying pipe 42. A fixed seat 43 is fixedly sleeved on the surface of the other end of the conveying pipe 42. A stabilizing shaft 44 is rotatably connected to the center of the fixed seat 43. A rotating cover 45 is fixedly connected to the upper end of the stabilizing shaft 44. A one-way air intake pipe 46 and a one-way air exhaust pipe 47 are embedded in the rotating cover 45. A fixed block 48 is fixedly connected to the outer wall of the fixed seat 43. Two clamping blocks 49 are fixedly connected to the upper surface of the fixed block 48. Two side plates 410 are symmetrically fixedly connected to the outer wall of the rotating cover 45. The same round block 411 is fixedly connected to the side plate 410. A rotating block 412 is rotatably connected to the surface of the round block 411. The rotating block 412 is clamped between the two clamping blocks 49, so that the two control valves 41 are respectively connected to the connecting pipe 23 and the L-shaped pipe. 36 are connected so that the two delivery pipes 42 are connected to the cylinder 22 and the delivery chamber 34 respectively, and then the rotating cover 45 is rotated according to the demand to make the one-way air inlet pipe 46 correspond to the delivery pipe 42 that needs to be injected with gas, and then the external charging and discharging joints are respectively connected to the one-way air inlet pipe 46 and the one-way exhaust pipe 47. At this time, the cylinder 22 and the delivery chamber 34 are respectively connected to the one-way air inlet pipe 46 and the one-way exhaust pipe 47, and the two control valves 41 are opened. In this way, it can be ensured that when the cylinder 22 delivers hydrogen to the inside of the tank body 1, the delivery chamber 34 will discharge the pressurized gas in the pressurized airbag 33, and when the delivery chamber 34 injects pressurized gas into the pressurized airbag 33, the cylinder 22 will discharge the hydrogen in the tank body 1, so that the operator can prevent the two gases from being input into the tank body 1 at the same time due to mistakes, and can prevent the tank body 1 from being damaged and leaked due to excessive pressure inside the tank body 1 due to operating errors.

[0018] The protection assembly 5 includes two clamping rings 51, which are respectively clamped on the outer walls of the upper and lower ends of the tank body 1. The outer walls of the clamping rings 51 are fixedly connected with fixing rods 52 at equal distances. The other end of the fixing rod 52 located at the lower end of the tank body 1 is fixedly connected with a protection tube 53. The other end of the fixing rod 52 located at the upper end of the tank body 1 is fixedly connected with a clamping tube 55. The clamping tube 55 is clamped inside the protection tube 53. The outer wall of the protection tube 53 is provided with a clamping groove 54, which is clamped on the surface of the L-shaped tube 36. The upper surface of the clamping tube 55 is provided with a plurality of arc-shaped pull-out holes. The outer wall of the slot 56 and the clamping tube 55 is symmetrically provided with a first plug hole 57, and the outer wall of the tank body 1 is symmetrically provided with a second plug hole 58. The first plug hole 57 and the second plug hole 58 are internally inserted with the same L-shaped plug rod 59. Two L-shaped clamping blocks 510 are fixedly connected to the outer wall of the tank body 1. The L-shaped plug rod 59 is clamped in the inside of the L-shaped clamping block 510. The tank body 1 is protected by the protective tube 53 to prevent the tank body 1 from being damaged by impact. The L-shaped plug rod 59 is inserted into the first plug hole 57 and the second plug hole 58, so that the tank body 1 is fixed by the two clamping rings 51.

[0019] Specifically, the arc-shaped opening 26 corresponds to the arc-shaped notch 27, and both the arc-shaped opening 26 and the arc-shaped notch 27 are arranged around the rotating shaft 24. When the arc-shaped opening 26 rotates, it can overlap with the arc-shaped notch 27. By controlling the size of the overlapping portion of the arc-shaped opening 26 and the arc-shaped notch 27, the hydrogen flow rate in the cylinder 22 is controlled.

[0020] Specifically, the cylinder cover 25 is clamped on the outer wall of the lower end of the cylinder 22, and the upper surface of the cylinder cover 25 matches the inner wall of the upper end of the tank body 1. The cylinder cover 25 blocks the lower end of the cylinder 22 to prevent hydrogen from entering the cylinder 22 under overpressure.

[0021] Specifically, the sealing ring 28 is located at the upper end of the connecting pipe 23, and the upper surface of the sealing ring 28 and the inner wall of the upper end of the cylinder 22 are pressed against each other, so that the sealing ring 28 blocks the upper end of the cylinder 22 to prevent hydrogen leakage.

[0022] Specifically, the one-way air intake pipe 46 and the one-way exhaust pipe 47 correspond to the two delivery pipes 42, and the one-way air intake pipe 46 and the one-way exhaust pipe 47 are tightly fitted with the two delivery pipes 42, so that the one-way air intake pipe 46 and the one-way exhaust pipe 47 are interconnected and spliced ​​with the two delivery pipes 4 to prevent gas leakage.

[0023] When in use, first put the tank body 1 into the protective cylinder 53, so that the lower end of the tank body 1 is clamped with the clamping ring 51, then clamp the clamping cylinder 55 into the protective cylinder 53, so that the upper end of the tank body 1 is clamped with the clamping ring 51, and then insert the L-shaped plug rod 59 into the first plug hole 57 and the second plug hole 58, so that the tank body 1 is fixed by the two clamping rings 51, and then connect the two control valves 41 to the connecting pipe 23 and the L-shaped pipe 36 respectively, so that the two delivery pipes 42 are connected to the cylinder 22 and the delivery chamber 34 respectively, and then rotate the rotary knob according to the needs. The cover 45 is moved to make the one-way air inlet pipe 46 correspond to the delivery pipe 42 that needs to be injected with gas, and then the external charging and discharging joints are respectively connected to the one-way air inlet pipe 46 and the one-way exhaust pipe 47. At this time, the cylinder 22 and the delivery chamber 34 are respectively connected to the one-way air inlet pipe 46 and the one-way exhaust pipe 47, and the two control valves 41 are opened. In this way, it can be ensured that when the cylinder 22 delivers hydrogen to the inside of the tank body 1, the delivery chamber 34 will discharge the pressurized gas in the pressurized airbag 33, and the delivery chamber 34 will then inject the pressurized gas into the pressurized airbag 33. When the hydrogen flows through the cylinder 22, the rotating shaft 24 is driven to rotate by the rotating rod 29, and the rotating shaft 24 drives the cylinder cover 25 to rotate. When the cylinder cover 25 rotates, the arc opening 26 is driven to correspond to the arc notch 27. By controlling the size of the overlap between the arc opening 26 and the arc notch 27, the cylinder 22 can be controlled. The flow rate of hydrogen in the cylinder 22 can reduce the pressure of the gas in the pipeline and prevent the pipeline from being damaged due to the excessive pressure in the tank body 1 pushing the gas to squeeze the pipeline. When gas is injected into the L-shaped tube 36, the gas is input into the delivery chamber 34 through the L-shaped tube 36, and then the gas is input into the booster airbag 33 through the air hole 35 in the delivery chamber 34. The booster airbag 33 is expanded by the gas, and the remaining hydrogen in the tank body 1 is pushed out by the booster airbag 33 to prevent the situation where the hydrogen pressure in the tank body 1 is too low and the hydrogen cannot be discharged.

[0024] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A hydrogen storage tank, comprising a tank body (1), a slow-release component (2) being arranged at the upper end of the transport tank body (1), a pressurizing component (3) being arranged inside the tank body (1), a transport component (4) being arranged on the slow-release component (2) and the pressurizing component (3), and a protective component (5) being arranged outside the tank body (1); Features: The slow-release assembly (2) comprises a fixing ring (21), the fixing ring (21) being embedded in the center of the upper outer wall of the tank body (1), a cylinder (22) being fixedly sleeved inside the fixing ring (21), a connecting pipe (23) being fixedly connected to the outer wall of the cylinder (22), a rotating shaft (24) being rotatably connected to the upper outer wall of the cylinder (22), a cylinder cover (25) being fixedly connected to the lower end of the rotating shaft (24), an arc-shaped opening (26) being provided on the outer wall of the cylinder cover (25), an arc-shaped notch (27) being provided on the lower outer wall of the cylinder (22), a sealing ring (28) being fixedly sleeved on the upper end surface of the rotating shaft (24), the sealing ring (28) being clamped on the upper inner wall of the cylinder (22), and a rotating rod (29) being fixedly connected to the uppermost end of the rotating shaft (24); The booster assembly (3) comprises a plurality of connecting plates (31), wherein the plurality of connecting plates (31) are symmetrically fixedly connected to the inner wall of the tank body (1), the other end of the connecting plate (31) is fixedly connected to the same airbag column (32), the inner wall of the airbag column (32) is fixedly connected to a booster airbag (33), the lower end of the airbag column (32) is provided with a delivery cavity (34), the inner wall of the delivery cavity (34) is provided with a plurality of air holes (35), an L-shaped tube (36) is fixedly sleeved on the inner wall of the lower end of the delivery cavity (34), and the other end of the L-shaped tube (36) penetrates the outer wall of the tank body (1) and extends to the outside; The delivery assembly (4) comprises two control valves (41), the control valves (41) being fixedly connected to the connecting pipe (23) and the L-shaped pipe (36) respectively, the other ends of the control valves (41) being fixedly connected to the delivery pipe (42), the other end surface of the delivery pipe (42) being fixedly sleeved with a fixing seat (43), the center of the fixing seat (43) being rotatably connected to a stabilizing shaft (44), the upper end of the stabilizing shaft (44) being fixedly connected to a rotating cover (45), the interior of the rotating cover (45) being embedded with a single To the air intake pipe (46) and the one-way exhaust pipe (47), a fixing block (48) is fixedly connected to the outer wall of the fixing seat (43), two clamping blocks (49) are fixedly connected to the upper surface of the fixing block (48), two side plates (410) are symmetrically fixedly connected to the outer wall of the rotating cover (45), the side plates (410) are fixedly connected to the same round block (411), a rotating block (412) is rotatably connected to the surface of the round block (411), and the rotating block (412) is clamped between the two clamping blocks (49).

2. The hydrogen storage tank according to claim 1, characterized in that: The protection assembly (5) comprises two clamping rings (51), the clamping rings (51) being clamped to the outer walls of the upper and lower ends of the tank body (1) respectively, the outer walls of the clamping rings (51) being fixedly connected with fixing rods (52) at equal distances, the other end of the fixing rod (52) located at the lower end of the tank body (1) being fixedly connected to a protection tube (53), the other end of the fixing rod (52) located at the upper end of the tank body (1) being fixedly connected to a clamping tube (55), the clamping tube (55) being clamped to the inside of the protection tube (53), and the outer wall of the protection tube (53) being provided with a clamping groove (54) The clamping groove (54) is clamped on the surface of the L-shaped tube (36); a plurality of arc-shaped grooves (56) are provided on the upper surface of the clamping tube (55); a first plug hole (57) is symmetrically provided on the outer wall of the clamping tube (55); a second plug hole (58) is symmetrically provided on the outer wall of the tank body (1); the same L-shaped plug rod (59) is inserted into the interior of the first plug hole (57) and the second plug hole (58); two L-shaped clamping blocks (510) are fixedly connected to the outer wall of the tank body (1); and the L-shaped plug rod (59) is clamped into the interior of the L-shaped clamping block (510).

3. The hydrogen storage tank according to claim 1, characterized in that: The arc-shaped opening (26) and the arc-shaped notch (27) correspond to each other, and the arc-shaped opening (26) and the arc-shaped notch (27) are both arranged around the rotating shaft (24).

4. The hydrogen storage tank according to claim 1, characterized in that: The cylinder cover (25) is clamped on the outer wall of the lower end of the cylinder (22), and the upper surface of the cylinder cover (25) matches the inner wall of the upper end of the tank body (1).

5. The hydrogen storage tank according to claim 1, characterized in that: The sealing ring (28) is located at the upper end of the connecting pipe (23), and the upper surface of the sealing ring (28) and the inner wall of the upper end of the cylinder (22) are pressed against each other.

6. The hydrogen storage tank according to claim 1, characterized in that: The one-way air intake pipe (46) and the one-way exhaust pipe (47) correspond to the two delivery pipes (42), and the one-way air intake pipe (46) and the one-way exhaust pipe (47) are tightly fitted with the two delivery pipes (42).

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