Internal noise reduction type centrifugal pump

Abstract

The invention relates to the field of noise reduction of centrifugal pumps, and discloses an internal noise reduction type centrifugal pump which comprises a pump cover, the volute is arranged on one side of the pump cover, and an impeller is arranged in the volute; the noise reduction box body is arranged in the pump cover, and a motor is arranged in the noise reduction box body; through multiple noise reduction and vibration reduction structures, the noise reduction capacity of the centrifugal pump is improved, and the service life of the centrifugal pump is prolonged. The motor is packaged through the noise reduction box body, a first sound insulation barrier is formed, outward transmission of noise is reduced, meanwhile, the sound insulation cotton a is arranged in the noise reduction box body to wrap the motor, and high-frequency noise generated when the motor works can be effectively absorbed. In addition, a sound insulation cavity is formed in the pump cover and filled with sound insulation cotton b, so that propagation of low-frequency noise is reduced, and residual noise is further attenuated. The cushioning component is arranged between the motor and the noise reduction box body and can absorb mechanical vibration during operation of the motor and prevent the vibration from being directly transmitted to the noise reduction box body to cause a resonance amplification effect, so that noise enhancement and structural fatigue caused by resonance are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of noise reduction of centrifugal pumps, and in particular to an internal noise reduction type centrifugal pump. Background Art

[0002] Centrifugal pump is a commonly used fluid conveying equipment, which mainly introduces liquid from the pump inlet through the rotating impeller and accelerates it through the centrifugal force of the impeller, and finally discharges the fluid. Centrifugal pumps are widely used in various industrial, agricultural and municipal engineering projects, and are often used to convey fluids such as water, oil, chemical liquids, emulsions, suspensions, liquid metals, etc. They can also convey gas-liquid mixtures and liquids containing suspended solids.

[0003] However, the centrifugal pumps in the prior art still have some deficiencies during use. In particular, when the motor rotates at high speed, it often generates loud noise. The generation of noise is usually accompanied by the vibration of the pump body, which not only affects the normal operation of the pump, but also causes noise pollution to the surrounding environment. Long-term high noise and vibration will cause fatigue and wear of various components in the pump body, thereby shortening the service life of the pump and may affect the working efficiency and reliability of the pump. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides an internal noise reduction centrifugal pump, aiming to alleviate the above problems at least to a certain extent.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions: An internal noise reduction centrifugal pump, comprising: Pump cover; A volute is arranged on one side of the pump cover, and an impeller is arranged in the volute; A noise reduction box body is arranged in the pump cover, and a motor is arranged in the noise reduction box body; A driving shaft disposed between the motor and the noise reduction box body, connected to the motor; Sound insulation cotton a is arranged in the noise reduction box body, and the sound insulation cotton a is located between the noise reduction box body and the motor. A sound insulation cavity is opened in the pump cover, and sound insulation cotton b is arranged in the sound insulation cavity; A sealing member provided between the noise reduction box body and the volute, used to prevent the liquid in the volute from entering the noise reduction box body; A noise reduction component disposed between the driving shaft and the noise reduction box body, used to press the sound insulation cotton a onto the motor; A liquid conveying component provided between the driving shaft and the noise reduction box body, used for conveying the liquid outside the pump cover onto the sound insulation cotton a; The shock absorbing component arranged between the motor and the noise reduction box body is used to reduce the resonance between the motor and the noise reduction box body when the motor is working.

[0006] Preferably, the inner wall of the noise reduction box body is connected to a mounting frame, the sound insulation cotton a is connected to the mounting frame, the other end of the sound insulation cotton a is connected to the inner side of the noise reduction box body, the inner side of the noise reduction box body is also connected to a waterproof film, one end of the waterproof film passes over the mounting frame and is folded back to one end of the noise reduction box body, and one end of the noise reduction box body is connected to a cover plate.

[0007] Preferably, the seal includes a connecting pipe connected to one side of the mounting frame, one end of the connecting pipe is connected to the volute, the drive shaft is in the connecting pipe, a plurality of connecting rings are provided in the connecting pipe, and a sealing ring in contact with the drive shaft is provided on the inner wall of the connecting ring.

[0008] Preferably, a plurality of bearings connected to the drive shaft are provided in the connecting pipe.

[0009] Preferably, the noise reduction component includes an annular airbag arranged in the noise reduction box body, the outer wall of the annular airbag is connected to the inner wall of the noise reduction box body, and the annular airbag wraps the sound insulation cotton a.

[0010] Preferably, a conveying cavity is opened inside the connecting pipe, and a plurality of liquid tubes a are connected to the conveying cavity. One end of the liquid tube a extends to the outer wall of the noise reduction box body and is slidably connected to the liquid tube b. A plurality of channels are opened inside the sound insulation cotton a. The liquid tube b extends into the channel and passes through the noise reduction box body and is slidably connected to the liquid tube c. One end of the liquid tube c passes through the pump cover and the sound insulation cotton b and extends to the outside of the pump cover. A plurality of liquid ports connected to the channels are opened on the outer wall of the liquid tube b. Springs are provided between the liquid tube b and the liquid tube a, and between the liquid tube b and the liquid tube c.

[0011] Preferably, the liquid delivery component can deliver liquid to the sound insulation cotton a when the drive shaft rotates, and allow the liquid to flow on the sound insulation cotton a; The liquid conveying component includes a screw a arranged on the driving shaft, a guide ring is threadedly connected to the screw a, one side of one of the connecting rings is connected to a limit rod, the guide ring is slidably connected to the limit rod, one side of the guide ring is connected to a rack, the connecting pipe is rotatably connected to a screw b, the outer wall of the connecting pipe is connected to a liquid inlet pipe, the outer wall of the liquid inlet pipe is provided with a liquid inlet hole, a piston threadedly connected to the screw b is slidably connected in the liquid inlet pipe, a connecting port for connecting the conveying chamber and the liquid inlet pipe is provided on the connecting pipe, a one-way valve is provided on the liquid pipe b, the screw a is a reciprocating screw, and the bottom of the screw b is connected to a gear meshing with the rack.

[0012] Preferably, the noise reduction component can allow the sound insulation cotton a to press the motor when the drive shaft rotates; The noise reduction component also includes a separation tube connected to one side of one of the connecting rings, an air cavity is formed between the separation tube and the inner wall of the connecting pipe, the air cavity is connected to an air inlet pipe connected to the pump cover, the air cavity is also connected to an air outlet pipe connected to the annular airbag, a one-way valve is also provided on the air outlet pipe, a push ring is slidably connected in the air cavity, and is connected to the rack.

[0013] Preferably, a plurality of micro holes are provided on the inner wall of the annular airbag close to the sound insulation cotton a, and an air outlet is provided on the outer wall of the noise reduction box body.

[0014] Preferably, the shock-absorbing component includes a connecting plate connected to the two ends of the noise reduction box body, the connecting plate is connected with damping cotton, the damping cotton is provided with a connecting groove, the damping cotton is also provided with a fixing opening, the fixing opening is connected with a fixing frame connected to the connecting plate, the two ends of the motor are respectively connected with connecting frames, the connecting frames extend into the connecting plate and fit into the connecting groove.

[0015] In summary, the present invention mainly has the following beneficial effects: This application improves the noise reduction ability and service life of the centrifugal pump through multiple noise reduction and vibration reduction structures. The motor is encapsulated by a noise reduction box to form the first sound insulation barrier to reduce the outward propagation of noise. At the same time, a sound insulation cotton a is arranged inside the noise reduction box to wrap the motor, which can effectively absorb the high-frequency noise generated when the motor is working. In addition, a sound insulation cavity is provided inside the pump cover, and sound insulation cotton b is filled therein to reduce the propagation of low-frequency noise and further attenuate the residual noise. The shock-absorbing component is arranged between the motor and the noise reduction box, which can absorb the mechanical vibration when the motor is running, prevent the vibration from being directly transmitted to the noise reduction box, and cause the resonance amplification effect, thereby reducing the noise enhancement and structural fatigue caused by resonance. The noise reduction component rotates with the drive shaft, so that the sound insulation cotton a forms a stable fit on the surface of the motor, reduces the gap, avoids the noise from being transmitted through the air, and improves the noise reduction effect. The drive shaft is linked to the noise reduction component to ensure that the sound insulation cotton a always fits the surface of the motor. Compared with the traditional fixed noise reduction material, this design can adapt to the thermal expansion and vibration of the motor during operation, and improve the stability of the noise reduction effect. When the drive shaft rotates, the liquid conveying component conveys the liquid outside the pump cover to the sound insulation cotton a and forms a dynamic fluid film. The liquid has a good damping effect on the propagation of sound waves, which can reduce the noise intensity generated by the motor, especially the obvious attenuation effect on high-frequency noise. At the same time, the flow of liquid can absorb part of the vibration energy, so that the vibration of the motor will not directly act on the noise reduction box, thereby reducing the resonance phenomenon. The liquid layer not only has the dual noise reduction capabilities of fluid damping and sound wave absorption, but also takes into account the liquid heat dissipation of the motor, so that the motor maintains a stable temperature during long-term operation, avoiding performance degradation or shortened service life due to overheating. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 is a schematic cross-sectional view of the pump casing structure of the present invention; Figure 3 yes Figure 2 A schematic diagram of the enlarged local structure at a in the middle; Figure 4 is a cross-sectional schematic diagram of the noise reduction box structure of the present invention; Figure 5 yes Figure 4 A magnified schematic diagram of the local structure at point b in the middle; Figure 6 is a cross-sectional schematic diagram of the liquid inlet pipe structure of the present invention; Figure 7 It is a schematic diagram of the structure of the shock absorbing component of the present invention.

[0017] Reference numerals: 100, pump cover; 101, volute; 102, impeller; 103, noise reduction box; 104, motor; 105, drive shaft; 106, sound insulation cotton a; 107, sound insulation cavity; 108, sound insulation cotton b; 200, mounting frame; 201, waterproof film; 202, cover plate; 203, connecting pipe; 204, bearing; 205, connecting ring; 206, sealing ring; 300, annular airbag; 301, separation tube; 302, air cavity; 303, air inlet pipe; 304, air outlet pipe; 305, push ring; 306, micropore; 400, delivery chamber; 401, liquid pipe a; 402, liquid pipe b; 403, channel; 404, liquid pipe c; 405, liquid port; 406, spring; 407, lead screw a; 408, limit rod; 409, rack; 410, lead screw b; 411, liquid inlet pipe; 412, liquid inlet hole; 413, piston; 414, connecting port; 415, one-way valve; 416, gear; 417, guide ring; 500, connecting plate; 501, damping cotton; 502, connecting groove; 503, fixing port; 504, fixing frame; 505, connecting frame. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] refer to Figure 1-Figure 7 , an internal noise reduction type centrifugal pump, comprising: Pump cover 100; A volute 101 is provided on one side of the pump housing 100, and an impeller 102 is provided in the volute 101; A noise reduction box body 103 is disposed in the pump cover 100, and a motor 104 is disposed in the noise reduction box body 103; A driving shaft 105 disposed between the motor 104 and the noise reduction box body 103 and connected to the motor 104; The sound insulation cotton a106 is arranged in the noise reduction box body 103, and the sound insulation cotton a106 is located between the noise reduction box body 103 and the motor 104. A sound insulation cavity 107 is opened in the pump cover 100, and sound insulation cotton b108 is arranged in the sound insulation cavity 107; The sealing member provided between the noise reduction box body 103 and the volute 101 is used to prevent the liquid in the volute 101 from entering the noise reduction box body 103; The noise reduction component disposed between the driving shaft 105 and the noise reduction box body 103 is used to press the sound insulation cotton a106 onto the motor 104; The liquid conveying component disposed between the driving shaft 105 and the noise reduction box body 103 is used to convey the liquid outside the pump cover 100 onto the sound insulation cotton a106; A shock absorbing component disposed between the motor 104 and the noise reduction box body 103, used to reduce the resonance between the motor 104 and the noise reduction box body 103 when the motor 104 is working; The noise reduction component can allow the sound insulation cotton a106 to press the motor 104 when the drive shaft 105 rotates; The liquid delivery component can deliver liquid to the sound insulation cotton a106 when the driving shaft 105 rotates, and allow the liquid to flow on the sound insulation cotton a106; By setting the motor 104, during the operation of the centrifugal pump, the motor 104 drives the drive shaft 105 to rotate, and then drives the impeller 102 in the volute 101 to rotate, so as to realize the fluid delivery. However, the motor 104 and the drive shaft 105 will generate noise and vibration when running at high speed. If not controlled, these noise and vibration will be transmitted outward through the pump cover 100, the volute 101 and other structures, affecting the surrounding environment, and may cause the resonance of the equipment itself to intensify, shortening the service life of the pump. To this end, the centrifugal pump adopts multiple noise reduction and vibration reduction structures. The motor 104 is installed in the noise reduction box body 103, and the noise reduction box body 103 acts as the first barrier to limit the transmission of the noise of the motor 104. Inside the noise reduction box body 103, the sound insulation cotton a106 is arranged around the motor 104 to further absorb the noise generated when the motor 104 is working, especially the high-frequency noise. In addition, a soundproof cavity 107 is provided inside the pump cover 100, which is filled with soundproof cotton b108. This structure can reduce the propagation of low-frequency noise and further attenuate the residual noise. Specifically, the noise reduction component is arranged between the drive shaft 105 and the noise reduction box body 103, and rotates with the drive shaft 105, so that the soundproof cotton a106 forms a stable fit on the surface of the motor 104, reduces the gap, and prevents the noise from being transmitted through the air, thereby improving the noise reduction effect. The role of the noise reduction component is equivalent to an "active fitting mechanism", which ensures that the soundproof cotton a106 can still fit tightly when the motor 104 vibrates, optimizes the sound absorption capacity, and at the same time, when the drive shaft 105 rotates, the liquid delivery component will deliver the liquid outside the pump cover 100 to the soundproof cotton a106 and let the liquid flow on the soundproof cotton a106. The liquid layer forms a dynamic fluid film on the outside of the motor 104. The liquid has a good damping effect on the propagation of sound waves, which can reduce the noise intensity generated by the motor 104, especially has a significant attenuation effect on high-frequency noise. The flow of the liquid can absorb part of the vibration energy, so that the vibration of the motor 104 will not directly act on the noise reduction box 103, thereby reducing the resonance phenomenon. In addition, the shock-absorbing component is arranged between the motor 104 and the noise reduction box 103, which is used to absorb the mechanical vibration of the motor 104 during operation, prevent the vibration from being directly transmitted to the noise reduction box 103, and induce the resonance amplification effect, so as to reduce the noise enhancement and structural fatigue caused by resonance. The present application adopts the drive shaft 105 to link the noise reduction component to ensure that the sound insulation cotton a106 can always be close to the surface of the motor 104, improve the noise absorption efficiency, and compared with the traditional fixed noise reduction material, the design can adapt to the dynamic changes such as thermal expansion and vibration of the motor 104 during operation, and improve the stability of the noise reduction effect. Through the liquid conveying component, a liquid layer is formed on the sound insulation cotton a106, so that it has the dual noise reduction capabilities of fluid damping + sound wave absorption, and at the same time it can also take into account the liquid heat dissipation of the motor 104, so that the motor 104 can maintain a stable temperature during long-term operation, avoiding performance degradation or shortened service life due to overheating.

[0020] As a further solution of the present invention, the inner wall of the noise reduction box body 103 is connected to a mounting frame 200, the sound insulation cotton a106 is connected to the mounting frame 200, the other end of the sound insulation cotton a106 is connected to the inner side of the noise reduction box body 103, the inner side of the noise reduction box body 103 is also connected to a waterproof film 201, one end of the waterproof film 201 passes over the mounting frame 200 and is folded back to one end of the noise reduction box body 103, and one end of the noise reduction box body 103 is connected to a cover plate 202; By setting up the waterproof film 201, the sound insulation cotton a106 is separated from the motor 104 to form an independent barrier. When the noise reduction component rotates with the drive shaft 105, pressure is applied to the waterproof film 201 to make it tightly attached to the outer surface of the motor 104. The waterproof film 201 serves as an intermediate layer. While providing a waterproof function, it can also evenly distribute the pressure applied by the noise reduction component. The flexible characteristics of the waterproof film 201 enable it to adapt to its slight deformation when the motor 104 is running, thereby ensuring the stability of the noise reduction system. At the same time, its smooth surface can reduce the flow resistance that may be generated during the liquid transportation process, so that the liquid can evenly cover the sound insulation cotton a106 to form a stable fluid damping layer, further enhancing the noise reduction effect, and to a certain extent, improve the heat dissipation capacity of the motor 104 to prevent the temperature rise problem caused by long-term operation.

[0021] As a further solution of the present invention, the sealing member includes a connecting pipe 203 connected to one side of the mounting frame 200, one end of the connecting pipe 203 is in communication with the volute 101, the drive shaft 105 is in the connecting pipe 203, a plurality of bearings 204 connected to the drive shaft 105 are provided in the connecting pipe 203, a plurality of connecting rings 205 are further provided in the connecting pipe 203, and a sealing ring 206 in contact with the drive shaft 105 is provided on the inner wall of the connecting ring 205; By setting a seal, it is ensured that the drive shaft 105 can maintain a stable sealing effect when rotating at high speed, and the fluid in the volute 101 is prevented from penetrating into the noise reduction box body 103, thereby avoiding the influence of the liquid on the motor 104 and the internal noise reduction components. One end of the connecting pipe 203 is connected to the volute 101, so that the drive shaft 105 can pass through it, and a plurality of bearings 204 are arranged inside to support the rotation of the drive shaft 105, reduce the rotation resistance, and ensure its smooth operation. The connecting ring 205 is arranged in the connecting pipe 203, and a sealing ring 206 is installed on its inner wall, so that the sealing ring 206 can fit tightly to the surface of the drive shaft 105, forming an efficient sealing barrier, which effectively prevents liquid leakage while ensuring the smooth rotation of the drive shaft 105, and prevents the noise reduction box body 103 from entering the water due to sealing failure.

[0022] As a further solution of the present invention, the noise reduction component includes an annular airbag 300 disposed in the noise reduction box body 103, the outer wall of the annular airbag 300 is connected to the inner wall of the noise reduction box body 103, and the annular airbag 300 wraps the sound insulation cotton a106; By setting up the annular airbag 300, gas can be injected into the annular airbag 300 during operation. When the annular airbag 300 expands, the sound insulation cotton a106 will be compressed and closely attached to the surface of the motor 104 through the waterproof film 201, forming a better sound wave isolation effect, thereby improving the noise reduction performance. This structure can effectively alleviate the impact of the vibration of the motor 104 on the sound insulation cotton a106 through the elastic effect of the annular airbag 300, avoid the failure of the sound insulation cotton a106 due to loosening or displacement due to vibration, and provide a more stable noise reduction capability. The annular airbag 300 wraps the sound insulation cotton a106, which not only enhances the noise reduction performance of the sound insulation cotton a106, but also effectively maintains its shape and density, avoiding the weakening of the noise reduction effect caused by compression or deformation of the sound insulation material during long-term operation. The elastic design of the annular airbag 300 provides a dynamic adjustment mechanism to adapt to the vibration changes of the motor 104 under different working conditions, so that the noise reduction effect can always be maintained in the best state. This design can ensure the long-term stable operation of the noise reduction material, and can also cope with the mechanical vibration and pressure changes that may be generated during the operation of the motor 104, thereby improving the reliability and effect of the overall noise reduction system.

[0023] As a further solution of the present invention, a delivery cavity 400 is provided inside the connecting pipe 203, and a plurality of liquid pipes a401 are connected to the delivery cavity 400, one end of the liquid pipe a401 extends to the outer wall of the noise reduction box body 103, and is slidably connected to the liquid pipe b402, a plurality of channels 403 are provided inside the sound insulation cotton a106, the liquid pipe b402 extends into the channel 403 and passes through the noise reduction box body 103 and is slidably connected to the liquid pipe c404, one end of the liquid pipe c404 passes through the pump cover 100 and the sound insulation cotton b108 and extends to the outside of the pump cover 100, a plurality of liquid ports 405 connected to the channel 403 are provided on the outer wall of the liquid pipe b402, and a spring 406 is provided between the liquid pipe b402 and the liquid pipe a401, and between the liquid pipe b402 and the liquid pipe c404; By setting the delivery chamber 400, the provided liquid delivery component can deliver the liquid outside the pump cover 100 into the delivery chamber 400, and the liquid can enter the liquid pipe a401, the liquid pipe b402 and the liquid pipe c404, and finally be discharged from the outside of the pump cover 100 through the liquid pipe c404. In this process, the liquid can reach the channel 403 through the liquid port 405, and the channel 403 disperses the liquid on the sound insulation cotton a106, ensuring that the liquid forms a stable liquid film on the sound insulation cotton a106, ensuring the noise reduction effect. By allowing the liquid pipe b402 to be slidably connected between the liquid pipe a401 and the liquid pipe c404, it can effectively adapt to the displacement changes that may occur in the sound insulation cotton a106 during the operation of the motor 104. Since the motor 104 may cause mechanical vibration and thermal expansion during operation, the sound insulation cotton a106 may undergo a slight displacement due to vibration or temperature changes, resulting in changes in the contact between it and the liquid pipe. The sliding connection design allows the liquid tube b402 to move freely to keep the liquid flow path unobstructed and ensure that the liquid can continue to evenly cover the sound insulation cotton a106.

[0024] As a further solution of the present invention, the liquid conveying component includes a lead screw a407 arranged on the driving shaft 105, a guide ring 417 is threadedly connected to the lead screw a407, one side of one connecting ring 205 is connected to a limit rod 408, the guide ring 417 is slidably connected to the limit rod 408, one side of the guide ring 417 is connected to a rack 409, a lead screw b410 is rotatably connected to the connecting pipe 203, an outer wall of the connecting pipe 203 is connected to a liquid inlet pipe 411, an outer wall of the liquid inlet pipe 411 is provided with a liquid inlet hole 412, a piston 413 threadedly connected to the lead screw b410 is slidably connected in the liquid inlet pipe 411, a connecting port 414 for connecting the conveying cavity 400 and the liquid inlet pipe 411 is provided on the connecting pipe 203, a one-way valve 415 is provided on the liquid pipe b402, the lead screw a407 is a reciprocating lead screw, and the bottom of the lead screw b410 is connected to a gear 416 meshing with the rack 409; By setting the lead screw a407, when the motor 104 drives the driving shaft 105 to rotate, the lead screw a407 thereon can rotate, and the guide ring 417 can be reciprocated along a predetermined path through the force of the thread. During the movement of the guide ring 417, the rack 409 can be displaced and the gear 416 and the lead screw b410 can be rotated, thereby allowing the piston 413 to slide up and down in the liquid inlet pipe 411. The external liquid can enter the liquid inlet pipe 411 through the liquid inlet hole 412. When the piston 413 moves downward, the liquid can be pressed into the delivery chamber 400. Under the guidance of the delivery chamber 400, the liquid can enter the liquid pipe a401, the liquid pipe b402 and the liquid pipe c404. When the piston 413 moves upward, a negative pressure can be formed in the liquid pipe a401, the liquid pipe c404 and the delivery chamber 400. At this time, the one-way valve 415 is closed to block the backflow of the liquid. After the piston 413 moves back to the position of the liquid inlet hole 412, the liquid can enter the liquid inlet pipe 411 again. In this way, when the drive shaft 105 is continuously driven by the motor 104 to rotate, the liquid can be effectively guided to flow on the sound insulation cotton a106. It is worth noting that the one-way valve 415 is a valve that only allows the liquid to flow in one direction. In the liquid delivery component, its function is to prevent the liquid from flowing back and ensure the stable delivery of the liquid in the predetermined direction. The one-way valve 415 in the prior art usually adopts an elastic member or a gravity self-reset structure. When the fluid flows in the forward direction, the valve flap is opened to overcome the force of the elastic member or gravity to allow the liquid to pass through; when the fluid stops or there is a tendency to flow back, the valve flap is automatically closed under the action of the elastic member or gravity to prevent backflow. This is the prior art and will not be described in detail here.

[0025] As a further solution of the present invention, the noise reduction component also includes a separation tube 301 connected to one side of one of the connection rings 205, an air cavity 302 is formed between the separation tube 301 and the inner wall of the connection pipe 203, the air cavity 302 is connected to an air inlet pipe 303 connected to the pump cover 100, the air cavity 302 is also connected to an air outlet pipe 304 connected to the annular airbag 300, a one-way valve 415 is also provided on the air outlet pipe 304, a push ring 305 is slidably connected in the air cavity 302, and is connected to the rack 409; By setting the air inlet pipe 303, the function of the air inlet pipe 303 is to introduce the gas outside the pump cover 100 into the air cavity 302, and the air outlet pipe 304 is used to transport the gas in the air cavity 302 to the annular airbag 300. The establishment of the one-way valve 415 can ensure the one-way flow of air and prevent the gas backflow from affecting the inflation effect of the annular airbag 300. In addition, the push ring 305 in the air cavity 302 is connected to the rack 409, and the push ring 305 can be driven to slide during the displacement of the rack 409, so that the gas in the air cavity 302 is squeezed and then transported to the annular airbag 300 through the air outlet pipe 304. The annular airbag 300 applies pressure to the sound insulation cotton a106, so that it is always close to the outer wall of the motor 104, thereby optimizing the noise reduction effect, and the gas flow in the air cavity 302 can form a certain buffering effect, reduce the transmission of vibration, and improve the overall stability of the equipment.

[0026] As a further solution of the present invention, a plurality of micro holes 306 are provided on the inner wall of the annular air bag 300 close to the sound insulation cotton a106, and an air outlet is provided on the outer wall of the noise reduction box body 103; By setting the micropores 306, as the drive shaft 105 rotates, due to the reciprocating movement of the lead screw a407, the push ring 305 will reciprocate in the air cavity 302, and then the annular airbag 300 can be continuously supplied with air, so that the air pressure in the annular airbag 300 continues to increase. When the air pressure in the annular airbag 300 reaches a preset value, the air will be discharged from the micropores 306 and blown to the sound insulation cotton a106 with liquid. On the one hand, the airflow can blow the liquid on the sound insulation cotton a106 that heats up due to the absorption of the heat of the motor 104, promoting the evaporation and heat dissipation of the liquid. On the other hand, the impact of the airflow can accelerate the flow of the liquid, so that the liquid is more evenly distributed on the surface of the sound insulation cotton a106, forming a stable fluid film structure, thereby further optimizing the noise reduction effect. In addition, the flow of the airflow can also effectively reduce the local saturation phenomenon that may occur in the sound insulation cotton a106 after the liquid is absorbed, maintain its good sound absorption and buffering performance, and ensure that the motor 104 can still maintain a stable noise reduction and vibration reduction effect during long-term operation. The diameter of the microhole 306 can be set between 0.05 mm and 0.2 mm.

[0027] As a further solution of the present invention, the shock absorbing component includes a connecting plate 500 connected to both ends of the noise reduction box body 103, a damping cotton 501 is connected to the connecting plate 500, a connecting groove 502 is provided on the damping cotton 501, a fixing port 503 is also provided on the damping cotton 501, a fixing frame 504 connected to the connecting plate 500 is connected to the fixing port 503, and connecting frames 505 are respectively connected to both ends of the motor 104, and the connecting frames 505 extend into the connecting plate 500 and fit into the connecting groove 502; By setting the fixing frame 504, the damping cotton 501 is positioned in the connecting plate 500 through the fixing port 503 and the fixing frame 504, and the motor 104 is matched with the damping cotton 501 through the connecting frame 505, which can allow the motor 104 to maintain a certain degree of light displacement during operation, so that the vibration of the motor 104 will not be completely transmitted to the noise reduction box 103, but will be buffered and absorbed by the damping cotton 501, thereby effectively slowing down the vibration and reducing the noise amplification effect caused by resonance. The damping cotton 501 can be made of high-density polyurethane foam, composite rubber or memory cotton materials, which have good elastic recovery characteristics and can effectively absorb the impact energy generated by mechanical vibration, reducing the impact of vibration on the motor 104 and surrounding structures.

[0028] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An internal noise reduction centrifugal pump, characterized in that: include: Pump cover; A volute is arranged on one side of the pump cover, and an impeller is arranged in the volute; A noise reduction box body is arranged in the pump cover, and a motor is arranged in the noise reduction box body; A driving shaft disposed between the motor and the noise reduction box body, connected to the motor; Sound insulation cotton a is arranged in the noise reduction box body, and the sound insulation cotton a is located between the noise reduction box body and the motor. A sound insulation cavity is opened in the pump cover, and sound insulation cotton b is arranged in the sound insulation cavity; A sealing member provided between the noise reduction box body and the volute, used to prevent the liquid in the volute from entering the noise reduction box body; A noise reduction component disposed between the driving shaft and the noise reduction box body, used to press the sound insulation cotton a onto the motor; A liquid conveying component provided between the driving shaft and the noise reduction box body, used for conveying the liquid outside the pump cover onto the sound insulation cotton a; The shock absorbing component arranged between the motor and the noise reduction box body is used to reduce the resonance between the motor and the noise reduction box body when the motor is working.

2. An internal noise reduction centrifugal pump according to claim 1, characterized in that: The inner wall of the noise reduction box body is connected to a mounting frame, the sound insulation cotton a is connected to the mounting frame, the other end of the sound insulation cotton a is connected to the inner side of the noise reduction box body, the inner side of the noise reduction box body is also connected to a waterproof film, one end of the waterproof film passes over the mounting frame and is folded back to one end of the noise reduction box body, and a cover plate is connected to one end of the noise reduction box body.

3. An internal noise reduction centrifugal pump according to claim 2, characterized in that: The sealing member comprises a connecting pipe connected to one side of the mounting frame, one end of the connecting pipe is communicated with the volute, the driving shaft is in the connecting pipe, a plurality of connecting rings are arranged in the connecting pipe, and a sealing ring in contact with the driving shaft is arranged on the inner wall of the connecting ring.

4. An internal noise reduction centrifugal pump according to claim 3, characterized in that: A plurality of bearings connected with the driving shaft are arranged in the connecting pipe.

5. An internal noise reduction centrifugal pump according to claim 3, characterized in that: The noise reduction component includes an annular airbag arranged in the noise reduction box body, the outer wall of the annular airbag is connected to the inner wall of the noise reduction box body, and the annular airbag wraps the sound insulation cotton a.

6. An internal noise reduction centrifugal pump according to claim 5, characterized in that: A conveying cavity is provided inside the connecting pipe, and a plurality of liquid pipes a are connected to the conveying cavity. One end of the liquid pipe a extends to the outer wall of the noise reduction box body and is slidably connected to a liquid pipe b. A plurality of channels are provided inside the sound insulation cotton a. The liquid pipe b extends into the channels and passes through the noise reduction box body and is slidably connected to a liquid pipe c. One end of the liquid pipe c passes through the pump cover and the sound insulation cotton b and extends to the outside of the pump cover. A plurality of liquid ports connected to the channels are provided on the outer wall of the liquid pipe b. Springs are provided between the liquid pipe b and the liquid pipe a, and between the liquid pipe b and the liquid pipe c.

7. An internal noise reduction centrifugal pump according to claim 6, characterized in that: The liquid conveying component can convey liquid to the sound insulation cotton a when the driving shaft rotates, and allow the liquid to flow on the sound insulation cotton a; The liquid conveying component includes a screw a arranged on the driving shaft, a guide ring is threadedly connected to the screw a, one side of one of the connecting rings is connected to a limit rod, the guide ring is slidably connected to the limit rod, one side of the guide ring is connected to a rack, the connecting pipe is rotatably connected to a screw b, the outer wall of the connecting pipe is connected to a liquid inlet pipe, the outer wall of the liquid inlet pipe is provided with a liquid inlet hole, a piston threadedly connected to the screw b is slidably connected in the liquid inlet pipe, a connecting port for connecting the conveying chamber and the liquid inlet pipe is provided on the connecting pipe, a one-way valve is provided on the liquid pipe b, the screw a is a reciprocating screw, and the bottom of the screw b is connected to a gear meshing with the rack.

8. An internal noise reduction centrifugal pump according to claim 7, characterized in that: The noise reduction component can allow the sound insulation cotton a to press the motor when the drive shaft rotates; The noise reduction component also includes a separation tube connected to one side of one of the connecting rings, an air cavity is formed between the separation tube and the inner wall of the connecting pipe, the air cavity is connected to an air inlet pipe connected to the pump cover, the air cavity is also connected to an air outlet pipe connected to the annular airbag, a one-way valve is also provided on the air outlet pipe, a push ring is slidably connected in the air cavity, and is connected to the rack.

9. An internal noise reduction centrifugal pump according to claim 5, characterized in that: The inner wall of the annular airbag close to the sound insulation cotton a is provided with a plurality of micro holes, and the outer wall of the noise reduction box body is provided with an air outlet.

10. An internal noise reduction centrifugal pump according to claim 1, characterized in that: The shock absorbing component includes a connecting plate connected to the two ends of the noise reduction box body, the connecting plate is connected with damping cotton, the damping cotton is provided with a connecting groove, the damping cotton is also provided with a fixing opening, the fixing opening is connected with a fixing frame connected to the connecting plate, the two ends of the motor are respectively connected with connecting frames, the connecting frames extend into the connecting plate and fit into the connecting groove.

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