Low noise explosion-proof motor

Abstract

This invention discloses a low-noise explosion-proof motor, relating to the field of motor technology. It includes a cylindrical body containing a motor, with a moving blade ring at the motor's output end. A support plate is also included on the inner wall of the cylindrical body. A stationary blade ring is located within the support plate, a fixed base is positioned at the front end of the moving blade ring, and an adjustment mechanism is located within the fixed base. The moving and stationary blade rings rotate in opposite directions to collaboratively reduce noise. Centrifugal force is used to automatically adjust the distance between them to reduce dynamic-static interference noise. A venturi structure is also incorporated to smoothly diffuse high-speed airflow. The combined effect of these three mechanisms effectively suppresses airflow noise during motor operation.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and more specifically, to a low-noise explosion-proof motor. Background Technology

[0002] As the core driving component of industrial equipment, the noise generated by the motor during operation is an important factor affecting the user experience. Motor noise mainly comes from electromagnetic noise, mechanical noise and aerodynamic noise. Among them, aerodynamic noise is mainly generated by airflow pulsation, eddies caused by the rotation of the cooling fan and interference between blades.

[0003] To reduce motor temperature rise, a fan is usually installed on the motor shaft for forced ventilation and heat dissipation. However, traditional fans have a simple structure and coarse airflow organization, which can easily generate significant broadband noise. In addition, the design of the fan and airflow guiding structure is relatively fixed and it is difficult to dynamically adjust according to airflow characteristics, resulting in prominent noise under certain operating conditions. Therefore, we provide a low-noise explosion-proof motor. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a low-noise explosion-proof motor.

[0005] To achieve the above objectives, the present invention provides the following technical solution: including a cylinder, a motor is disposed inside the cylinder, a moving blade ring is disposed at the output end of the motor, and a support plate is disposed on the inner wall of the cylinder; The stationary blade ring is set inside the support plate. The moving blade ring actively drives the airflow, while the stationary blade ring passively reverses the pre-rotation to reduce noise. The fixed base is located at the front end of the moving blade ring; The adjustment mechanism, located within the fixed base, is used to adjust the distance between the moving blade ring and the stationary blade ring by utilizing the centrifugal force generated when the moving blade ring rotates.

[0006] Preferably, the adjusting mechanism includes an abutment disposed on the outside of the fixed seat, an elastic element disposed on the inner wall of the cylinder, the abutment and the elastic element cooperating with each other, a rotating element disposed in the support plate, and a positioning element disposed in the stationary blade ring, the rotating element and the abutment cooperating with each other.

[0007] Preferably, the abutting element includes sleeves symmetrically arranged at both ends of the fixed base, each sleeve containing a movable spring, and each movable spring having an abutting pin at one end.

[0008] Preferably, the elastic element includes an annular ring disposed on the inner wall of the cylinder, a cavity is formed inside the annular ring, an air bladder is disposed inside the cavity, one end of the two abutting pins abuts against the inner wall of the air bladder, one end of the air bladder is connected to an air outlet pipe, and one end of the air outlet pipe is connected to a support plate.

[0009] Preferably, the rotating component includes a cavity disposed within a support plate, a piston block is slidably connected within the cavity, a compression spring is disposed on one side of the piston block, and one end of the compression spring is connected within the cavity.

[0010] Preferably, a circular plate is provided on one side of the cavity, and an oblique hole is provided on the upper surface of the circular plate. A positioning block is provided at one end of the piston block, and the positioning block is slidably connected in the oblique hole.

[0011] Preferably, a fixed shaft is provided on the upper surface of the circular plate, one end of the fixed shaft passes through the support plate, and a corrugated strip is provided on the outer wall of the fixed shaft.

[0012] Preferably, the positioning component includes an auxiliary cylinder disposed at the bottom end of the stationary blade ring, the inner wall of the auxiliary cylinder is provided with a limiting block, and the limiting block is slidably connected to the corrugated strip.

[0013] Preferably, the auxiliary cylinder sidewall is provided with a limiting rod, the support plate sidewall is provided with a limiting hole, the limiting rod is slidably connected in the limiting hole, and the stationary blade ring is rotatably connected in the auxiliary cylinder.

[0014] Preferably, the inner wall of the cylinder is provided with a noise reduction tube, the cross-sectional area of ​​which gradually decreases along the airflow direction to the minimum cross-section at the throat, and then gradually increases along the airflow direction. The upper surface of the support plate is provided with an air outlet, which is connected to the cavity.

[0015] Preferably, a sliding rod is provided inside the air outlet cylinder, an inclined block is provided at one end of the sliding rod that passes through the air outlet cylinder, and an annular plate is provided at the throat of the noise reduction tube in the cylinder body.

[0016] Preferably, the annular plate has a notch, the upper end of the inclined block abuts against the inner wall of the notch, a tension spring is provided in the notch, one end of the tension spring is provided in the inner wall of the cylinder, the upper surface of the annular plate has a circumferentially elongated hole, a pressing rod is slidably connected in the elongated hole, one end of multiple sets of pressing rods is provided at the throat of the noise reduction tube, and one end of the pressing rod is provided in the cylinder.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. In this invention, by setting a moving blade ring and a stationary blade ring, the stationary blade ring is driven to rotate in the opposite direction by the airflow from the moving blade ring when the motor is running. The two rotate in opposite directions. The moving blade ring actively drives the airflow, while the stationary blade ring passively reverses the pre-rotation to reduce noise. The two work together to effectively reduce airflow pulsation and eddy noise.

[0018] 2. In this invention, an adjustment mechanism is set up to automatically adjust the distance between the moving blade ring and the stationary blade ring by utilizing the centrifugal force generated when the moving blade ring rotates. Under high-speed conditions, the increased distance increases the wake attenuation distance, thereby reducing the interference noise between the moving and stationary blade rings and achieving an adaptive noise reduction effect based on the rotational speed.

[0019] 3. In this invention, a noise-reducing tube is installed inside the cylinder, and an annular plate and extrusion rods are installed at its throat position. The airflow drives the sliding rod to rotate the annular plate, so that multiple sets of extrusion rods extrude pressure at the throat position of the noise-reducing tube. The airflow velocity increases and the static pressure decreases at the throat, so that the high-speed airflow thrown out by the moving blade ring is smoothly diffused, thereby further suppressing noise. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure proposed in this invention; Figure 2 This is a schematic diagram of the motor proposed in this invention; Figure 3 This is a schematic diagram of the moving blade ring proposed in this invention; Figure 4 This is a cross-sectional schematic diagram of the cylindrical body proposed in this invention; Figure 5 This is a schematic diagram of the adjustment mechanism proposed in this invention; Figure 6 This is a bottom-view schematic diagram of the annular ring proposed in this invention; Figure 7 The present invention proposes Figure 6 Schematic diagram at point A; Figure 8 This is a bottom view of the support plate proposed in this invention.

[0021] In the picture: 1. Cylinder; 2. Motor; 3. Moving blade ring; 4. Support plate; 5. Stationary blade ring; 6. Fixed seat; 7. Adjusting mechanism; 8. Abutting component; 9. Elastic component; 10. Rotating component; 11. Positioning component; 12. Sleeve; 13. Movable spring; 14. Abutting pin; 15. Annular ring; 16. Cavity; 17. Airbag; 18. Air outlet pipe; 19. Hole; 20. Piston block; 21. Compression spring; 22. Circular plate; 23. Inclined hole; 24. Positioning block; 25. Fixed shaft; 26. Corrugated strip; 27. Auxiliary cylinder; 28. Limiting block; 29. ​​Limiting rod; 30. Limiting hole; 31. Noise reduction tube; 32. Air outlet pipe; 33. Sliding rod; 34. Inclined block; 35. Annular plate; 36. Notch; 37. Tension spring; 38. Long strip hole; 39. Extrusion rod. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this specification are for illustrative purposes only and do not represent the only possible implementation.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0025] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0026] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0027] Example 1 further illustrates the low-noise explosion-proof motor 2 proposed in this invention, which includes a cylinder 1, a motor 2 detachably installed inside the cylinder 1, a moving blade ring 3 fixed at the output end of the motor 2, a support plate 4 fixedly connected to the inner wall of the cylinder 1, a stationary blade ring 5 disposed inside the support plate 4, the moving blade ring 3 actively drives the air to swing, the stationary blade ring 5 passively reverses the pre-rotation to reduce noise, and a fixing seat 6 disposed at the front end of the moving blade ring 3. Depend on Figures 1 to 4 It can be seen that the cylinder 1 is cylindrical, and a motor 2 is detachably installed inside the cylinder 1. A moving blade ring 3 is fixedly installed on the non-shaft extension end of the motor 2. The moving blade ring 3 is directly driven by the motor 2 and rotates synchronously with the shaft of the motor 2 to generate cooling airflow. A support plate 4 is fixed on the inner wall of the cylinder 1. The support plate 4 has a long strip structure. An auxiliary cylinder 27 moves vertically inside the support plate 4. A stationary blade ring 5 is installed inside the auxiliary cylinder 27 through a silicone oil damper.

[0028] The stationary blade ring 5 has six sets of blades fixed on it. The inlet and outlet angles of the blades are optimized so that the stationary blade ring 5 is driven to rotate in the opposite direction by the airflow from the moving blade ring 3 when the motor 2 is running. The rotation direction is opposite to that of the moving blade ring 3. In this way, the moving blade ring 3 actively drives the wind to swing, and the stationary blade ring 5 passively reverses the pre-rotation to reduce noise. The two work together to reduce airflow pulsation and vortex noise. Meanwhile, the device is equipped with an adjustment mechanism 7 in the fixed base 6. The adjustment mechanism 7 includes a contacting element 8, an elastic element 9 is provided on the inner wall of the cylinder 1, the contacting element 8 and the elastic element 9 cooperate, a rotating element 10 is provided in the support plate 4, and a positioning element 11 is provided in the stationary blade ring 5. The rotating element 10 and the contacting element 8 cooperate to adjust the distance between the moving blade ring 3 and the stationary blade ring 5 by using the centrifugal force generated when the moving blade ring 3 rotates. In this way, the adjustment mechanism 7 automatically adjusts the distance between the moving blade ring 3 and the stationary blade ring 5 by using the centrifugal force generated when the moving blade ring 3 rotates. Working principle: This device sets up a moving blade ring 3 and a stationary blade ring 5, so that the stationary blade ring 5 is driven to rotate in the opposite direction by the airflow from the moving blade ring 3 when the motor 2 is running. In this way, the moving blade ring 3 actively drives the airflow, and the stationary blade ring 5 passively reverses and pre-rotates to reduce noise. The two work together to reduce airflow pulsation and eddy noise. When the moving blade ring 3 rotates to a certain speed, the centrifugal force generated by the rotation of the moving blade ring 3 automatically adjusts the distance between the moving blade ring 3 and the stationary blade ring 5: under high-speed conditions, the distance increases to increase the wake attenuation distance and reduce dynamic and static interference noise.

[0029] Example 2 Based on Embodiment 1, the following technical features are added: The abutting member 8 includes sleeves 12 symmetrically installed at both ends of the fixed base 6. Each sleeve 12 is fixedly connected with a movable spring 13. Each movable spring 13 has an abutting pin 14 fixed at one end. The elastic member 9 includes an annular ring 15 fixedly connected to the inner wall of the cylinder 1. A cavity 16 is formed inside the annular ring 15. An airbag 17 is installed inside the cavity 16. One end of the abutting pins 14 on both sides abuts against the inner wall of the airbag 17. One end of the airbag 17 is connected to an air outlet pipe 18. One end of the air outlet pipe 18 is connected to the support plate 4. Depend on Figures 3 to 6 It can be seen that sleeves 12 are fixed on both sides of the fixed seat 6. The sleeves 12 are fixed with abutting pins 14 through movable springs 13. When the moving blade ring 3 rotates, the fixed seat 6 drives the sleeves 12 to rotate synchronously. Its centrifugal force drives the abutting pins 14 to move outward. Since the inner wall of the cylinder 1 is fixed with an annular ring 15, and an air bag 17 is installed in the annular ring 15, when the moving blade ring 3 rotates to a certain speed, the centrifugal force it generates abuts the air bag 17, thereby allowing the gas in the air bag 17 to be transmitted outward through the air outlet pipe 18. The rotating component 10 includes a cavity 19 located within the support plate 4. A piston block 20 is slidably connected within the cavity 19. A compression spring 21 is fixedly connected to one side of the piston block 20. The compression spring 21 is a carbon spring. After the airbag stops compressing, the compression spring 21 can drive the device to reset. It has high strength and is convenient for daily use. One end of the compression spring 21 is connected to the inner wall of the cavity 19. A circular plate 22 is rotatably connected to one side of the cavity 19. An oblique hole 23 is provided on the upper surface of the circular plate 22. A positioning block 24 is fixed to one end of the piston block 20. The positioning block 24 is slidably connected within the oblique hole 23. Depend on Figures 4 to 8 It can be seen that a cavity 19 is formed inside the support plate 4. The cavity 19 is connected to the air bag 17 through the air outlet pipe 18. The piston block 20 is fixed to the inner wall of the cavity 19 by the compression spring 21. The gas pushes the piston block 20 to move towards the circular plate 22. The positioning block 24 at the end of the piston block 20 is slidably connected in the inclined hole 23, thereby driving the circular plate 22 to rotate. A fixed shaft 25 is installed on the upper surface of the circular plate 22. One end of the fixed shaft 25 passes through the support plate 4. A corrugated strip 26 is fixedly connected to the outer wall of the fixed shaft 25. The positioning component 11 includes an auxiliary cylinder 27 rotatably connected to the bottom end of the stationary blade ring 5. A limit block 28 is fixedly connected to the inner wall of the auxiliary cylinder 27. The limit block 28 is slidably connected to the corrugated strip 26. A limit rod 29 is fixedly connected to the side wall of the auxiliary cylinder 27. A limit hole 30 is provided on the side wall of the support plate 4. The limit rod 29 is slidably connected in the limit hole 30. The stationary blade ring 5 is rotatably connected in the auxiliary cylinder 27. The side wall of the support plate 4 is provided with a long strip-shaped limit hole 30. The limit rod 29 moves vertically within the limit hole 30. The limit rod 29 is L-shaped. The auxiliary cylinder 27 is fixed inside the limit rod 29. Depend on Figures 5 to 8It is known that the auxiliary cylinder 27 is equipped with a stationary blade ring 5 through a silicone oil damper. Since the stationary blade ring 5 is reversed by the airflow, a portion of the wind energy is consumed by the silicone oil damper. This portion of energy consumption does not exit from the main shaft, which is equivalent to a slight increase in the net output of the main shaft. The side wall of the auxiliary cylinder 27 is slidably connected to the support plate 4 through the limiting rod 29. Due to the limitation of the limiting hole 30, the auxiliary cylinder 27 can only move within the limiting hole 30. At the same time, the limiting block 28 on the inner wall of the auxiliary cylinder 27 is slidably connected to the corrugated strip 26. When the fixed shaft 25 rotates, the deflection force of the corrugated strip 26 drives the auxiliary cylinder 27 to move. Working principle: During use, the moving blade ring 3 drives the fixed seat 6 to rotate. At this time, the sleeve 12 rotates synchronously. Its centrifugal force drives the abutment pin 14 to move outward. When the moving blade ring 3 rotates to a certain speed, the centrifugal force it generates drives the abutment pin 14 to squeeze the air bag 17. The movable spring 13 deforms, so that the gas in the air bag 17 is transmitted outward through the air outlet pipe 18. The gas enters the cavity 19 and pushes the piston block 20 to move towards the circular plate 22. The positioning block 24 at the end of the piston block 20 is slidably connected in the inclined hole 23, thereby driving the circular plate 22 to rotate. The circular plate 22 drives the corrugated strip 26 on the fixed shaft 25 to rotate, and the limiting block 28 is slidably connected to the corrugated strip 26. Due to the deflection force of the corrugated strip 26, the limiting rod 29 on the side wall of the auxiliary cylinder 27 is slidably connected in the limiting hole 30, thus adjusting the distance between the moving blade ring 3 and the stationary blade ring 5.

[0030] Example 3 Based on Embodiment 2, the following technical features are added: a noise reduction pipe 31 is fixedly connected to the inner wall of the cylinder 1. The cross-sectional area of ​​the noise reduction pipe 31 gradually decreases along the airflow direction to the minimum cross-section at the throat, and then gradually increases along the airflow direction. An air outlet 32 ​​is fixed to the upper end face of the support plate 4. The air outlet 32 ​​is connected to the cavity 19. Figures 3 to 6 It can be seen that its noise reduction tube 31 adopts a venturi tube, which increases the airflow velocity and reduces the static pressure at the throat. A sliding rod 33 moves inside the air outlet 32. An inclined block 34 is fixedly connected to one end of the sliding rod 33 that passes through the air outlet 32. An annular plate 35 is rotatably connected to the cylinder 1 at the throat position of the noise reduction tube 31. A notch 36 is provided in the annular plate 35. The upper end of the inclined block 34 abuts against the inner wall of the notch 36. A tension spring 37 is fixedly connected in the notch 36. The tension spring 37 is a carbon spring with high strength. The tension spring 37 is used for device reset. One end of the tension spring 37 is fixedly connected to the inner wall of the cylinder 1. The upper surface of the annular plate 35 is provided with a long strip hole 38 in a circular shape. A pressing rod 39 is slidably connected in the long strip hole 38. One end of multiple pressing rods 39 abuts against the throat position of the noise reduction tube 31. One end of the pressing rod 39 is located inside the cylinder 1. Depend on Figures 3 to 8It can be seen that a sliding rod 33 moves vertically inside the air outlet 32. As gas enters the sliding rod 33, it causes the sliding rod 33 to move upward. Since the cylinder 1 is fixedly connected to the annular plate 35 by the tension spring 37, when the inclined block 34 on the sliding rod 33 abuts against the notch 36, it causes the annular plate 35 to rotate. Since the annular plate 35 has a circumferentially arranged elongated hole 38, and a squeezing rod 39 moves radially inside the elongated hole 38, and the squeezing rod 39 is movably connected inside the cylinder 1, it squeezes the throat of the noise reduction tube 31 to suppress airflow separation. Working principle: When the moving blade ring 3 rotates to a certain speed, as the gas enters the cavity 19, one side squeezes the piston block 20, and the other side squeezes out the sliding rod 33 in the air cylinder 32. This causes the sliding rod 33 to move upward. The inclined block 34 on the sliding rod 33 abuts against the notch 36, thereby causing the annular plate 35 to rotate. Since the squeezing rod 39 is movably connected in the cylinder 1 and its bottom end is slidably connected in the elongated hole 38, under the deflection force of the elongated hole 38, multiple sets of squeezing rods 39 squeeze the throat of the noise reduction tube 31. In this way, the airflow velocity increases and the static pressure decreases in the throat, so that the high-speed airflow thrown out by the moving blade ring 3 can be smoothly diffused, thereby suppressing noise.

[0031] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A low-noise explosion-proof motor, comprising a cylinder, wherein a motor is disposed within the cylinder, and a moving blade ring is disposed at the output end of the motor, characterized in that, It also includes, A support plate is disposed on the inner wall of the cylinder; The stationary blade ring is set inside the support plate. The moving blade ring actively drives the airflow, while the stationary blade ring passively reverses and pre-rotates to reduce noise. The fixed base is located at the front end of the moving blade ring; The adjustment mechanism, located within the fixed base, is used to adjust the distance between the moving blade ring and the stationary blade ring by utilizing the centrifugal force generated when the moving blade ring rotates.

2. The low-noise explosion-proof motor according to claim 1, characterized in that, The adjustment mechanism includes an abutment disposed on the outside of the fixed seat, an elastic element disposed on the inner wall of the cylinder, the abutment and the elastic element cooperating with each other, a rotating element disposed in the support plate, and a positioning element disposed in the stationary blade ring, the rotating element and the abutment cooperating with each other.

3. The low-noise explosion-proof motor according to claim 2, characterized in that, The abutting component includes sleeves symmetrically arranged at both ends of the fixed base, each sleeve containing a movable spring, and each movable spring having an abutting pin at one end.

4. A low-noise explosion-proof motor according to claim 3, characterized in that, The elastic element includes an annular ring disposed on the inner wall of the cylinder, a cavity is formed inside the annular ring, an air bladder is disposed inside the cavity, one end of the two abutting pins abuts against the inner wall of the air bladder, one end of the air bladder is connected to an air outlet pipe, and one end of the air outlet pipe is connected to a support plate.

5. A low-noise explosion-proof motor according to claim 4, characterized in that, The rotating component includes a cavity disposed within a support plate, a piston block slidably connected within the cavity, a compression spring disposed on one side of the piston block, and one end of the compression spring being connected to the inner wall of the cavity.

6. A low-noise explosion-proof motor according to claim 5, characterized in that, A circular plate is provided on one side of the cavity, and an oblique hole is provided on the upper surface of the circular plate. A positioning block is provided at one end of the piston block, and the positioning block is slidably connected in the oblique hole.

7. A low-noise explosion-proof motor according to claim 6, characterized in that, A fixed shaft is provided on the upper surface of the circular plate, one end of which passes through the support plate, and a corrugated strip is provided on the outer wall of the fixed shaft.

8. A low-noise explosion-proof motor according to claim 7, characterized in that, The positioning component includes an auxiliary cylinder disposed at the bottom end of the stationary blade ring, and a limiting block is provided on the inner wall of the auxiliary cylinder, the limiting block being slidably connected to the corrugated strip.

9. A low-noise explosion-proof motor according to claim 8, characterized in that, The auxiliary cylinder is provided with a limiting rod on its side wall, and the support plate is provided with a limiting hole on its side wall. The limiting rod is slidably connected in the limiting hole, and the stationary blade ring is rotatably connected in the auxiliary cylinder.

10. A low-noise explosion-proof motor according to claim 5, characterized in that, The inner wall of the cylinder is provided with a noise reduction tube. The cross-sectional area of ​​the noise reduction tube gradually decreases along the airflow direction to the minimum cross-section at the throat, and then gradually increases along the airflow direction. An air outlet is provided on the upper surface of the support plate, and the air outlet is connected to the cavity.

11. A low-noise explosion-proof motor according to claim 10, characterized in that, A sliding rod is provided inside the air outlet cylinder, and an inclined block is provided at one end of the sliding rod that passes through the air outlet cylinder. An annular plate is provided at the throat of the noise reduction tube in the cylinder body.

12. A low-noise explosion-proof motor according to claim 11, characterized in that, The annular plate has a notch, the upper end of the inclined block abuts against the inner wall of the notch, a tension spring is installed in the notch, one end of the tension spring is installed on the inner wall of the cylinder, the upper surface of the annular plate has a circumferentially elongated hole, a pressing rod is slidably connected in the elongated hole, one end of multiple sets of the pressing rods is installed at the throat of the noise reduction tube, and the other end of the pressing rod is installed inside the cylinder.

Images