Silencer for Roots blower with gas backflow prevention device

Abstract

The utility model provides a Roots blower silencer with a gas backflow prevention device, which is provided with an outer cylinder, the outer cylinder comprises an outer cylinder front end gas inlet section, a gas inlet pipe is fixedly arranged at the front end of the outer cylinder front end gas inlet section, the rear section of the gas inlet pipe is positioned in an inner cavity of the outer cylinder, and an inner cylinder is arranged in the inner cavity of the outer cylinder. A through hole is formed in the middle of the front end of the inner cylinder, the inner cylinder is fixedly connected with the portion, located in an inner cavity of the outer cylinder, of the outer circumference of the air inlet pipe through the through hole, a valve plate is arranged on the front section of the inner cavity of the air inlet pipe, and the valve plate and the inner cavity of the air inlet pipe are longitudinally arranged. The Roots blower solves the technical problems that in the operation process of the blower, when the blower is suddenly shut down due to factors such as power failure or faults, gas in a system pipeline can generate the condition of gas flow back blowing, so that gas flow impact is caused to the interior of the blower, and an impeller of the Roots blower is directly damaged to different degrees. The Roots blower can be widely applied to Roots blowers.

Description

Technical Field

[0001] The utility model relates to a muffler, in particular to a muffler for a Roots blower with a device for preventing gas backflow. Background Art

[0002] A Roots blower is a positive-displacement gas blower, which is widely used in ventilation and process gas transportation in fields such as environmental protection, sewage treatment, coal power, and chemical industry.

[0003] In order to increase the smoothness of the conveying gas entering the gas transmission system pipeline and reduce the noise generated during gas transportation, a muffler is usually connected between the air outlet of the blower and the gas transmission system pipeline, so as to achieve the smooth flow of gas and reduce the operating noise.

[0004] However, when the blower is suddenly stopped due to factors such as power failure or malfunction during operation, the gas in the system pipeline will have a situation of reverse air blowing, which will cause an air flow impact on the inside of the blower, directly resulting in varying degrees of damage to the impeller of the Roots blower and shortening the service life of the blower. Summary of the Utility Model

[0005] The utility model aims at the above technical problems and provides a muffler for a Roots blower with a device for preventing gas backflow. A valve plate is installed inside the muffler for a Roots blower with a device for preventing gas backflow. When the blower is suddenly stopped due to factors such as power failure or malfunction, the valve plate can prevent the reverse air flow from causing an air flow impact on the inside of the blower, thereby avoiding damage to the impeller inside the Roots blower and extending the service life of the blower.

[0006] Therefore, the technical solution of the utility model is a muffler for a Roots blower with a device for preventing gas backflow, which is provided with an outer cylinder. The outer cylinder includes an outer cylinder front-end intake section, an outer cylinder middle connection section, and an outer cylinder rear-end outlet section. The outer cylinder front-end intake section is located at the front end of the outer cylinder, the outer cylinder middle connection section is located in the middle of the outer cylinder, and the outer cylinder rear-end outlet section is located at the rear end of the outer cylinder;

[0007] The outer cylinder front-end intake section and the outer cylinder rear-end outlet section are arc-shaped structures;

[0008] An intake pipe is fixedly provided at the front end of the outer cylinder front-end intake section. The intake pipe is communicated with the inner cavity of the outer cylinder, and the rear section of the intake pipe is located in the inner cavity of the outer cylinder;

[0009] An exhaust pipe is fixedly provided at the rear end of the outer cylinder rear-end outlet section. The exhaust pipe is communicated with the inner cavity of the outer cylinder;

[0010] An inner cylinder is provided in the inner cavity of the outer cylinder. The inner cylinder includes a front-end guiding section and a rear-end connecting section of the inner cylinder. The front-end guiding section of the inner cylinder is an arc-shaped structure. The front-end guiding section of the inner cylinder is located at the front end of the inner cylinder, and the rear-end connecting section of the inner cylinder is located at the rear end of the inner cylinder. A blocking plate is fixedly provided at the rear end of the rear-end connecting section of the inner cylinder;

[0011] A through hole is provided at the middle position of the front-end guiding section of the inner cylinder. The inner cylinder is fixedly connected to the part of the outer circumference of the intake pipe located in the inner cavity of the outer cylinder through the through hole. The inner circumference of the outer cylinder is fixedly connected to the position of the outer circumference of the inner cylinder near the front-end guiding section through an inner cylinder support plate;

[0012] A valve plate is provided at the front section of the inner cavity of the intake pipe. The valve plate is longitudinally arranged between the inner cavity of the intake pipe;

[0013] A valve plate fixing seat is fixedly provided at the position near the upper end of the inner side of the valve plate. The valve plate fixing seat is a hollow structure. A valve plate fixing pin is provided in the inner cavity of the valve plate fixing seat. Both ends of the valve plate fixing pin are fixedly connected to both ends of the intake pipe. Under the supporting action of the valve plate fixing pin, the valve plate fixing seat realizes forward and backward swinging, and the valve plate fixing seat drives the valve plate to swing forward and backward synchronously while swinging forward and backward;

[0014] A second limiting block is fixedly provided at the position of the upper half part of the circumferential surface of the inner cavity of the intake pipe adjacent to the inner side of the valve plate, and a first limiting block is fixedly provided at the position of the lower half part of the circumferential surface of the inner cavity of the intake pipe adjacent to the outer side of the valve plate. In the free state of the valve plate, the upper half part of the valve plate is in close contact with the second limiting block, and the lower half part of the valve plate is in close contact with the first limiting block;

[0015] An intake pipe air outlet hole is provided at the circumferential position of the part of the intake pipe located in the inner cavity of the outer cylinder. The intake pipe air outlet hole is located at the position adjacent to the inner side of the through hole at the outermost side of the front-end guiding section of the inner cylinder;

[0016] A porous support partition is provided at the rear end position of the inner cavity of the outer cylinder. The outer circumference of the porous support partition is vertically fixedly connected to the inner circumference of the outer cylinder;

[0017] A plurality of through holes are respectively provided at the positions near the outer circumference of the blocking plate and the porous support partition. The plurality of through holes on the blocking plate and the porous support partition are symmetrically arranged horizontally. A shunt pipe is fixedly provided between each horizontally symmetrically arranged through hole. The front end of the shunt pipe passes through the blocking plate and is communicated with the inner cavity of the inner cylinder, and the rear end of the shunt pipe is communicated with the inner cavity of the outer cylinder.

[0018] Preferably, the number of the porous support partitions is two, and the two porous support partitions are respectively located at the positions near both ends of the shunt pipe.

[0019] Preferably, a counterweight block is fixedly provided at the position near the lowermost end of the inner side of the valve plate.

[0020] Preferably, after the upper half and the lower half of the valve plate are respectively in close contact with the second limit block and the first limit block, there is an inclination angle in the counterclockwise direction between the valve plate and the inner circumference of the intake pipe, and the inclination angle in the counterclockwise direction is 10° ± 1°.

[0021] Preferably, a flange is fixedly provided on the outermost side of the intake pipe, and a flange is fixedly provided on the outermost side of the exhaust pipe.

[0022] Preferably, a sealing ring groove is provided at the inner end of the first limit block, and a first sealing ring is fixedly provided in the sealing ring groove. The thickness of the first sealing ring is greater than the depth of the sealing ring groove;

[0023] A sealing ring groove is provided at the outer end of the second limit block, and a second sealing ring is fixedly provided in the sealing ring groove. The thickness of the second sealing ring is greater than the depth of the sealing ring groove.

[0024] Preferably, the number of air outlet holes of the intake pipe is multiple, and the multiple air outlet holes of the intake pipe are evenly distributed along the circumferential direction on the intake pipe.

[0025] Preferably, the multiple through holes on the blocking plate and the porous support partition are evenly distributed along the circumferential direction at positions close to the outer circumference of the blocking plate and the porous support partition respectively.

[0026] Preferably, the through holes of the porous support partition and the outer circumference of the shunt pipe are fixed by welding;

[0027] The shunt pipe and the blocking plate are fixed by welding;

[0028] The intake pipe and the outer cylinder are fixed by welding;

[0029] The first limit block and the second limit block are respectively fixed to the inner circumference of the intake pipe by welding;

[0030] The flange is fixed to the intake pipe by welding, and the flange is fixed to the exhaust pipe by welding.

[0031] The beneficial effects of the present utility model are:

[0032] 1. By arranging a valve plate in the inner cavity of the intake pipe, when there is a situation of reverse air blowing, the air flow returns from the exhaust pipe direction towards the intake pipe direction. When the air flow enters the inner cavity of the intake pipe, the valve plate can block the air flow in the inner cavity of the intake pipe, preventing the air flow from flowing out of the intake pipe and causing impact damage to the internal components of the blower.

[0033] 2. By providing an inclination angle in the counterclockwise direction between the valve plate and the inner circumference of the intake pipe, when the swing sensitivity of the valve plate is reduced due to external factors, by setting the inclination angle, under the action of gravity inertia, the valve plate can be quickly attached to the first limit block and the second limit block, further avoiding the reverse flow of the air flow from the intake pipe. Description of the Drawings

[0034] Figure 1 is a structural sectional view of the utility model;

[0035] Figure 2 is the utility model Figure 1 schematic diagram in the B direction;

[0036] Figure 3 is the utility model Figure 1 schematic diagram in the C direction;

[0037] Figure 4 is the utility model Figure 1 enlarged view at A in the figure.

[0038] Explanation of symbols in the figure:

[0039] 1. Outer cylinder; 101. Front-end intake section of the outer cylinder; 102. Middle connection section of the outer cylinder; 103. Rear-end exhaust section of the outer cylinder; 2. Inner cylinder; 201. Front-end guiding section of the inner cylinder; 202. Rear-end connection section of the inner cylinder; 203. Plug plate; 3. Inner cylinder support plate; 4. Porous support partition; 5. Diverging pipe; 6. Intake pipe; 601. Air outlet hole of the intake pipe; 7. Valve plate; 8. Flange; 9. Exhaust pipe; 10. Counterweight; 11. Valve plate fixing seat; 12. Valve plate fixing pin; 13. Intake pipe plug plate; 14. First sealing ring; 15. Second sealing ring; 16. Second limiting block; 17. First limiting block. Specific embodiments

[0040] The following further describes the utility model in conjunction with embodiments.

[0041] Through Figures 1-4 It can be seen that the silencer for a Roots blower with a gas backflow prevention device is provided with an outer cylinder 1. The outer cylinder 1 includes a front-end intake section 101 of the outer cylinder, a middle connection section 102 of the outer cylinder, and a rear-end exhaust section 103 of the outer cylinder. The front-end intake section 101 of the outer cylinder is located at the front end of the outer cylinder 1, the middle connection section 102 of the outer cylinder is located at the middle position of the outer cylinder 1, and the rear-end exhaust section 103 of the outer cylinder is located at the rear end of the outer cylinder 1.

[0042] The front-end intake section 101 of the outer cylinder and the rear-end exhaust section 103 of the outer cylinder are of arc-shaped structures. The arc-shaped structures can increase the overall support strength of the outer cylinder 1 and prevent the outer cylinder 1 from deforming under long-term air flow impact.

[0043] It should be particularly noted that the rear-end exhaust section 103 of the outer cylinder is designed as an arc-shaped structure, which can play a role in guiding the gas flowing out of the diverging pipe 5 and smoothly guiding the gas into the exhaust pipe 9, preventing the gas from forming multi-directional turbulent flow in the inner cavity of the outer cylinder 1 and playing a certain noise reduction role.

[0044] At the front end of the front-end air intake section 101 of the outer cylinder, an air inlet pipe 6 is fixedly provided. The air inlet pipe 6 is in communication with the inner cavity of the outer cylinder 1, and the rear section of the air inlet pipe 6 is partially located in the inner cavity of the outer cylinder 1.

[0045] At the rear end of the rear-end air outlet section 103 of the outer cylinder, an exhaust pipe 9 is fixedly provided. The exhaust pipe 9 is in communication with the inner cavity of the outer cylinder 1.

[0046] An inner cylinder 2 is provided in the inner cavity of the outer cylinder 1. The inner cylinder 2 includes an inner cylinder front-end guiding section 201 and an inner cylinder rear-end connecting section 202. The inner cylinder front-end guiding section 201 is located at the front end of the inner cylinder 2, and the inner cylinder rear-end connecting section 202 is located at the rear end of the inner cylinder 2. A plug plate 203 is fixedly provided at the rear end of the inner cylinder rear-end connecting section 202. The inner cylinder front-end guiding section 201 is of an arc-shaped structure, and the arc-shaped inner cylinder front-end guiding section 201 plays a role in guiding the gas.

[0047] A through hole is provided at the middle position of the inner cylinder front-end guiding section 201. The inner cylinder 2 is fixedly connected to the part of the outer circumference of the air inlet pipe 6 located in the inner cavity of the outer cylinder 1 through the through hole. The outer circumference of the inner cylinder 2 near the inner cylinder front-end guiding section 201 is fixedly connected to the inner circumference of the outer cylinder 1 through an inner cylinder support plate 3.

[0048] A valve plate 7 is provided at the front section position of the inner cavity of the air inlet pipe 6, and the valve plate 7 is longitudinally arranged with the inner cavity of the air inlet pipe 6.

[0049] A valve plate fixing seat 11 is fixedly provided at the position near the upper end on the inner side of the valve plate 7. The valve plate fixing seat 11 is of a hollow structure. A valve plate fixing pin 12 is provided in the inner cavity of the valve plate fixing seat 11. The two ends of the valve plate fixing pin 12 are fixedly connected to the two ends of the air inlet pipe 6. Under the supporting action of the valve plate fixing pin 12, the valve plate fixing seat 11 realizes forward and backward swinging, and while the valve plate fixing seat 11 swings forward and backward, it drives the valve plate 7 to swing forward and backward synchronously.

[0050] A second limiting block 16 is fixedly provided at the adjacent position on the inner side of the upper half part of the circumferential surface of the inner cavity of the air inlet pipe 6, and a first limiting block 17 is fixedly provided at the adjacent position on the outer side of the lower half part of the circumferential surface of the inner cavity of the air inlet pipe 6. In the free state of the valve plate 7, the upper half part of the valve plate 7 is in close fit with the second limiting block 16, and the lower half part of the valve plate 7 is in close fit with the first limiting block 17.

[0051] By providing the valve plate 7 in the inner cavity of the air inlet pipe 6, when the situation of air flow backwashing occurs, the air flow flows back from the direction of the exhaust pipe 9 towards the direction of the air inlet pipe 6. When the air flow enters the inner cavity of the air inlet pipe 6, the valve plate 7 can block the air flow in the inner cavity of the air inlet pipe 6, preventing the air flow from flowing out of the air inlet pipe 6 and causing impact damage to the internal components of the blower.

[0052] The air inlet pipe 6 is provided with air inlet pipe air outlet holes 601 at the circumferential position of the middle part of the inner cavity of the outer cylinder 1. The air inlet pipe air outlet holes 601 are located at the adjacent position inside the through holes on the outermost side of the front-end guiding section 201 of the inner cylinder. This position is designed such that when the gas is discharged from the air inlet pipe air outlet holes 601, through the drainage of the front-end guiding section 201 of the inner cylinder, the gas can be smoothly drained backward and enter the interior of the shunt pipe 5, preventing the gas from forming multi-directional turbulence in the inner cavity of the inner cylinder 2 and playing a certain role in noise reduction.

[0053] A porous support partition plate 4 is provided at the rear end position of the plug plate 203 in the inner cavity of the outer cylinder 1. A perpendicular fixed connection is provided between the outer circumference of the porous support partition plate 4 and the inner circumference of the outer cylinder 1.

[0054] A plurality of through holes are respectively provided at the positions near the outer circumference of the plug plate 203 and the porous support partition plate 4. The plurality of through holes on the plug plate 203 and the porous support partition plate 4 are symmetrically arranged horizontally. A shunt pipe 5 is fixedly provided between each pair of horizontally symmetrically arranged through holes. The front end of the shunt pipe 5 passes through the plug plate 203 and is in communication with the inner cavity of the inner cylinder 2, and the rear end of the shunt pipe 5 is in communication with the inner cavity of the outer cylinder 1.

[0055] The number of the porous support partition plates 4 is two, and the two porous support partition plates 4 are respectively located at the positions near both ends of the shunt pipe 5.

[0056] The inner cylinder support plate 3 and the two porous support partition plates 4 support the overall structure formed by the inner cylinder 2 and the shunt pipe 5 from three positions of the front, middle, and rear, which can reduce the resonance amplitude between the inner cylinder 2 and the shunt pipe 5 and the outer cylinder 1 when the air flow passes through the inner cylinder 2 and the shunt pipe 5, and further reduce the generation of noise.

[0057] A counterweight block 10 is fixedly provided at the position near the lowermost end inside the valve plate 7, which can ensure the quick fitting of the valve plate 7 with the first limit block 17 and the second limit block 16.

[0058] After the upper half and the lower half of the valve plate 7 are respectively in close contact with the second limit block 16 and the first limit block 17, an inclined angle in the counterclockwise direction is provided between the valve plate 7 and the inner circumference of the air inlet pipe 6. The inclined angle in the counterclockwise direction is 10° ± 1°. When the swing sensitivity of the valve plate 7 is reduced due to external factors, by setting the inclined angle, under the action of gravity, the valve plate 7 can be quickly fitted with the first limit block 17 and the second limit block 16. It should be noted that if the inclined angle is too large, the reflux gas will form rotary turbulence in the inner cavity of the air inlet pipe 6, causing unnecessary impact on the inner cavity of the air inlet pipe 6. If the inclined angle is too small, the gravity inertia will be too small, making it difficult to achieve the quick fitting of the valve plate 7 with the first limit block 17 and the second limit block 16.

[0059] A flange 8 is fixedly provided on the outermost side of the intake pipe 6, and a flange 8 is fixedly provided on the outermost side of the exhaust pipe 9. Through the flange 8, the quick disassembly and assembly between the muffler and the adjacent device can be realized, and the operation is simple and fast.

[0060] A sealing ring groove is provided at the inner end of the first limiting block 17, and a first sealing ring 14 is fixedly provided in the sealing ring groove. The thickness of the first sealing ring 14 is greater than the depth of the sealing ring groove. A sealing ring groove is provided at the outer end of the second limiting block 16, and a second sealing ring 15 is fixedly provided in the sealing ring groove. The thickness of the second sealing ring 15 is greater than the depth of the sealing ring groove. Thus, the outermost sides of the first sealing ring 14 and the second sealing ring 15 respectively exceed the outermost end faces of the first limiting block 17 and the second limiting block 16. When the valve plate 7 quickly fits to the first limiting block 17 and the second limiting block 16, the two ends of the valve plate 7 respectively touch and closely fit with the first sealing ring 14 and the second sealing ring 15, which can avoid the two ends of the valve plate 7 directly colliding with the first limiting block 17 and the second limiting block 16 and causing damage to each other. At the same time, the first sealing ring 14 and the second sealing ring 15 can play a certain role in buffering and noise reduction.

[0061] The number of the intake pipe air outlet holes 601 is multiple, and the multiple intake pipe air outlet holes 601 are evenly distributed along the circumferential direction on the intake pipe 6. The gas can be discharged outward from the multiple intake pipe air outlet holes 601, and all can be drained through the front end guiding section 201 of the inner cylinder, which can not only ensure sufficient noise reduction but also increase the gas flow rate.

[0062] The plurality of through holes on the blocking plate 203 and the porous support partition plate 4 are respectively evenly distributed along the circumferential direction at positions close to the outer circumference of the blocking plate 203 and the porous support partition plate 4, which can ensure that when the gas flows from the plurality of shunt pipes 5 to the inner cavity of the outer cylinder 1, it forms a uniform airflow contact with the inner circumference of the outer cylinder 1, and can reduce the vibration amplitude of the muffler and further reduce the generation of noise.

[0063] The through holes of the porous support partition plate 4 and the outer circumference of the shunt pipe 5 are fixed by welding, the shunt pipe 5 and the blocking plate 203 are fixed by welding, the intake pipe 6 and the outer cylinder 1 are fixed by welding, the first limiting block 17 and the second limiting block 16 are respectively fixed by welding with the inner circumference of the intake pipe 6, the flange 8 and the intake pipe 6 are fixed by welding, and the flange 8 and the exhaust pipe 9 are fixed by welding, which can increase the fixing strength between the corresponding components on the muffler, thereby increasing the overall support strength of the muffler.

[0064] However, the above are only specific embodiments of the present invention, and the scope of implementation of the present invention cannot be limited thereby. Therefore, the replacement of equivalent components or the equivalent changes and modifications made according to the scope of the patent protection of the present invention should still fall within the scope covered by the claims of the present invention.

Claims

1. A muffler for a Roots blower with a gas backflow prevention device, characterized in that: An outer cylinder is provided, the outer cylinder comprising an air inlet section at the front end of the outer cylinder, a middle connecting section of the outer cylinder, and an air outlet section at the rear end of the outer cylinder, the air inlet section at the front end of the outer cylinder is located at the front end of the outer cylinder, the middle connecting section of the outer cylinder is located at the middle of the outer cylinder, and the air outlet section at the rear end of the outer cylinder is located at the rear end of the outer cylinder; The air inlet section at the front end of the outer cylinder and the air outlet section at the rear end of the outer cylinder are arc-shaped structures; An air intake pipe is fixedly provided at the front end of the air intake section at the front end of the outer tube, the air intake pipe is communicated with the inner cavity of the outer tube, and the rear section of the air intake pipe is located in the inner cavity of the outer tube; An exhaust pipe is fixedly provided at the rear end of the rear end air outlet section of the outer tube, and the exhaust pipe is communicated with the inner cavity of the outer tube; An inner cylinder is arranged in the inner cavity of the outer cylinder, and the inner cylinder comprises a front end guide section of the inner cylinder and a rear end connecting section of the inner cylinder. The front end guide section of the inner cylinder is an arc-shaped structure, the front end guide section of the inner cylinder is located at the front end position of the inner cylinder, the rear end connecting section of the inner cylinder is located at the rear end position of the inner cylinder, and a blocking plate is fixedly arranged at the rear end of the rear end connecting section of the inner cylinder; A through hole is provided in the middle of the front end guide section of the inner cylinder, and the inner cylinder is fixedly connected to the portion of the outer circumference of the air inlet pipe located in the inner cavity of the outer cylinder through the through hole, and the position of the outer circumference of the inner cylinder close to the front end guide section of the inner cylinder and the inner circumference of the outer cylinder are fixedly connected through an inner cylinder support plate; A valve plate is provided at the front section of the inner cavity of the air intake pipe, and is longitudinally arranged between the valve plate and the inner cavity of the air intake pipe; A valve plate fixing seat is fixedly provided on the inner side of the valve plate near the upper end. The valve plate fixing seat is a hollow structure. A valve plate fixing pin is provided in the inner cavity of the valve plate fixing seat. The two ends of the valve plate fixing pin are fixedly connected to the two ends of the intake pipe. The valve plate fixing seat is supported by the valve plate fixing pin to swing back and forth. The valve plate fixing seat swings back and forth and drives the valve plate to swing back and forth synchronously. The upper half of the circumferential surface of the inner cavity of the air intake pipe is located at an inner side adjacent to the valve plate and fixedly provided with a second limit block, and the lower half of the circumferential surface of the inner cavity of the air intake pipe is located at an outer side adjacent to the valve plate and fixedly provided with a first limit block, and when the valve plate is in a free state, the upper half of the valve plate is tightly fitted with the second limit block, and the lower half of the valve plate is tightly fitted with the first limit block; An air inlet pipe outlet hole is provided at a circumferential position of the air inlet pipe located in the inner cavity of the outer tube, and the air inlet pipe outlet hole is located at an inner side adjacent to the outermost through hole of the guide section at the front end of the inner tube; A porous support baffle is provided in the inner cavity of the outer cylinder at the rear end of the blocking plate, and the outer circumference of the porous support baffle is vertically fixedly connected to the inner circumference of the outer cylinder; The blocking plate and the porous support baffle are respectively provided with a plurality of through holes at positions close to the outer circumference, and the plurality of through holes on the blocking plate and the porous support baffle are arranged transversely symmetrically, and a shunt pipe is fixed between each of the transversely symmetrically arranged through holes, and the front end of the shunt pipe passes through the blocking plate and the inner cavity of the inner tube and is connected to each other, and the rear end of the shunt pipe is connected to the inner cavity of the outer tube.

2. The muffler for Roots blower with a gas backflow prevention device according to claim 1, characterized in that: The number of the porous support baffles is two, and the two porous support baffles are respectively located near the two ends of the diversion pipe.

3. The muffler for Roots blower with a gas backflow prevention device according to claim 1, characterized in that: A counterweight is fixedly provided at a position near the lower end of the inner side of the valve plate.

4. The muffler for Roots blower with a gas backflow prevention device according to claim 1, characterized in that: After the upper and lower parts of the valve plate are tightly fitted with the second limit block and the first limit block respectively, a counterclockwise inclination angle is provided between the valve plate and the inner circumference of the intake pipe, and the counterclockwise inclination angle is 10°±1°.

5. The muffler for Roots blower with a gas backflow prevention device according to claim 1, characterized in that: A sealing ring groove is provided at the inner end of the first limiting block, a first sealing ring is fixedly provided in the sealing ring groove, and the thickness of the first sealing ring is greater than the depth of the sealing ring groove; A sealing ring groove is provided at the outer end of the second limiting block, a second sealing ring is fixedly provided in the sealing ring groove, and the thickness of the second sealing ring is greater than the depth of the sealing ring groove.

6. The muffler for Roots blower with a gas backflow prevention device according to claim 1, characterized in that: The number of the air outlet holes of the air intake pipe is multiple, and the multiple air outlet holes of the air intake pipe are evenly distributed along the circumferential direction on the air intake pipe.

7. The muffler for Roots blower with a gas backflow prevention device according to claim 1, characterized in that: The plurality of through holes on the blocking plate and the porous supporting partition are evenly distributed along the circumferential direction at positions of the blocking plate and the porous supporting partition close to the outer circumference.

8. The muffler for Roots blower with a gas backflow prevention device according to claim 1, characterized in that: The outermost side of the air inlet pipe is fixedly provided with a flange, and the outermost side of the exhaust pipe is fixedly provided with a flange.

9. The muffler for Roots blower with a gas backflow prevention device according to any one of claims 1 to 7, characterized in that: The through holes of the porous support baffle and the outer circumference of the diverter pipe are fixed by welding; The shunt pipe and the blocking plate are fixed by welding; The air inlet pipe and the outer cylinder are fixed by welding; The first limiting block and the second limiting block are respectively fixed to the inner circumference of the air intake pipe by welding.

10. The muffler for Roots blower with a gas backflow prevention device according to claim 8, characterized in that: The flange is fixed to the air inlet pipe by welding, and the flange is fixed to the exhaust pipe by welding.

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