Low-noise injection pump set

Abstract

The utility model relates to the technical field of injection pumps, and discloses a low-noise injection pump set which comprises a motor, a pump head is fixedly installed on one side of the motor, and an output shaft of the motor is fixedly connected with the input end of the pump head. The protection structure is arranged outside the pump head and used for reducing noise, the multiple sound absorption plates are installed on the inner wall of the cover body, interference channels are formed through the extending parts on the two sides of the sound absorption plates, the uneven interference faces are formed on the inner wall of the cover body, sound waves generated when an impeller impacts liquid can be gradually absorbed by the interference faces, and propagation and diffusion of the sound waves are restrained; the split cover body facilitates later-stage additional installation of the protection structure, meanwhile, the acoustic board and the extension part are conveniently and independently replaced after being aged and damaged, the closed structure of the cover body prevents noise from directly leaking out, gaps of the acoustic board and the interference groove absorb energy through cavity resonance and surface reflection, and the noise reduction effect is achieved. Medium-high frequency noise is absorbed through reflection and cavity resonance.

Description

Technical Field

[0001] This utility model relates to the field of jet pump technology, and in particular to a low-noise jet pump set. Background Technology

[0002] Jet pumps are a new type of high-efficiency and energy-saving equipment. The working principle is that when the working fluid is ejected at high speed through the nozzle under high pressure, a low pressure is generated in the mixing chamber. The fluid to be transported is drawn into the mixing chamber, mixes with the working fluid, and enters the diffusion chamber together, thereby achieving the purpose of transporting fluid. However, jet pumps are very noisy when running. In order to reduce the noise during operation, low-noise jet pumps have emerged.

[0003] A search revealed a low-noise jet pump (publication number: CN203655730U). The key technical features include a pump body and a motor. One end of the pump body is connected to one end of the motor. The motor contains a main shaft that extends into the pump body. The pump body has an outlet at its upper end, an inlet at its front end, and a mounting base at its bottom. An impeller is located within the pump body and is mounted on the main shaft. The pump body consists of an outer shell and an inner shell, with a first sound-insulating cavity formed between them. This first sound-insulating cavity is filled with sound-absorbing cotton.

[0004] In existing technologies, noise is mainly suppressed by installing sound insulation cotton. Although basic noise reduction is achieved through double-layer sound insulation cavity and sound-absorbing cotton, it is essentially a passive sound absorption design. It has inherent defects such as weak low-frequency suppression, high risk of sound leakage, and narrow frequency band coverage. The noise reduction method is relatively simple. In particular, it needs to be optimized for high-frequency howling and low-frequency resonance of pump head. At the same time, the maintainability is poor. There is room for optimization in both acoustic performance and engineering practicality.

[0005] Therefore, we propose a low-noise jet pump set. Utility Model Content

[0006] The present invention aims to solve the technical problems existing in the prior art and provide a low-noise jet pump set.

[0007] To achieve the above objectives, this utility model adopts the following technical solution: a low-noise jet pump assembly, comprising:

[0008] An electric motor, wherein a pump head is fixedly mounted on one side of the motor, and the output shaft of the motor is fixedly connected to the input end of the pump head;

[0009] A protective structure is installed outside the pump head for noise reduction. The protective structure includes a cover, sound-absorbing panels, and an interference channel. The cover is fixedly installed outside the pump head, and several sound-absorbing panels are fixedly installed on the inner wall of the cover. An interference channel for interfering with sound waves is formed between two adjacent sound-absorbing panels.

[0010] In a preferred embodiment of this utility model, the cover is a cylindrical structure, and the end of the cover is provided with a window for the pump head to enter. The cover is divided into two separate shell structures along the radial direction, and the shell structures are locked and fixed to the pump head by bolts.

[0011] In a preferred embodiment of this utility model, the sound-absorbing plate is an arc-shaped plate, and the sound-absorbing plate is fixedly installed on the inner wall of the cover, with a gap between the sound-absorbing plate and the outer wall of the pump head.

[0012] As a preferred embodiment of the present invention, the protective structure further includes an extension portion, with one extension portion provided on each side of the sound-absorbing panel, and an interference channel formed between two adjacent extension portions.

[0013] In a preferred embodiment of this utility model, the extension is integrally formed with the sound-absorbing plate, the extension extends obliquely toward the center of the sound-absorbing plate, and an interference channel with a gradually narrowing opening and a funnel shape is formed between two adjacent extensions.

[0014] As a preferred embodiment of the present invention, the protective structure further includes a first interference groove and a dispersion hole. A plurality of first interference grooves are provided on one side of the sound-absorbing plate, and a plurality of dispersion holes are provided on one side of the extension. The sound-absorbing plate forms a reflective surface through the plurality of first interference grooves, and the extension forms a sawtooth surface through the plurality of dispersion holes.

[0015] In a preferred embodiment of this utility model, the first interference groove is a groove with a trapezoidal cross-section, extending from one end of the sound-absorbing plate to the other end, and the dispersion hole is a funnel-shaped groove, extending obliquely from the bottom to the top of the extension.

[0016] Beneficial effects

[0017] This invention provides a low-noise jet pump assembly. It has the following beneficial effects:

[0018] 1. This low-noise jet pump unit uses multiple sound-absorbing panels installed on the inner wall of the enclosure. The extensions on both sides of the sound-absorbing panels form interference channels, creating an uneven interference surface on the inner wall of the enclosure. The sound waves generated by the impeller impacting the liquid are gradually absorbed by the interference surface, suppressing the propagation and diffusion of the sound waves, thereby reducing the noise of the pump. The separate enclosure facilitates the later addition of protective structures, and allows for easy replacement of the sound-absorbing panels and extensions after aging or damage. The enclosed structure of the enclosure prevents noise from leaking out directly. The gaps between the sound-absorbing panels and the interference grooves absorb energy through cavity resonance and surface reflection. Mid-to-high frequency noise is absorbed through reflection and cavity resonance. Noise reduction is achieved through a multi-level cooperative approach of sound absorption, scattering, and interference.

[0019] 2. This low-noise jet pump unit, by opening several first interference grooves at the end of the sound-absorbing plate and several dispersion holes at the bottom of the extension, since the interference channel formed between the two extensions is funnel-shaped, the sound diffuses towards the outer circumference of the cover. The dispersion holes of the funnel make the edge of the extension form a sawtooth surface, so that the sound wave can be initially interfered and dispersed before entering the interference channel. Combined with the reflective surface formed by the multiple first interference grooves at the bottom of the sound-absorbing plate, the sound wave is further interfered and dispersed, consuming the propagation energy of the sound wave, and achieving the purpose of suppressing noise by continuously attenuating the sound wave. When transporting liquid, it reduces the sound of liquid squeezing and colliding with the pump head, and finally achieves the purpose of noise reduction. It disrupts the phase consistency of the sound wave, specifically suppresses high-frequency noise, and weakens low-frequency energy by extending the sound wave path and using interference and scattering. Attached Figure Description

[0020] Figure 1 This is one of the perspective views of the motor and pump head of this utility model;

[0021] Figure 2 This is the second perspective view of the motor and pump head of this utility model;

[0022] Figure 3 This is a perspective view of the entire utility model;

[0023] Figure 4 This is a perspective view of the protective structure of this utility model;

[0024] Figure 5 A perspective view of the cover body of this utility model with the sound-absorbing panel installed;

[0025] Figure 6 This is a 3D view of the sound-absorbing panel.

[0026] Legend: 10. Motor; 11. Pump head; 20. Cover; 21. Sound-absorbing plate; 22. Interference channel; 23. Extension; 24. First interference groove; 25. Dispersion hole. Detailed Implementation

[0027] A low-noise jet pump assembly, such as Figure 1 and Figure 2 As shown, it includes:

[0028] The motor 10 has a pump head 11 fixedly mounted on one side. The output shaft of the motor 10 is fixedly connected to the input end of the pump head 11. The top of the pump head 11 is provided with a water inlet and a suction hole, and the end of the pump head 11 is provided with a water outlet. The pump head 11 includes at least a housing, an impeller disposed inside the housing, and a rotating shaft fixedly connected to the impeller and rotatably connected to the housing. The rotating shaft is fixedly connected to the output shaft of the motor 10. The motor 10 drives the rotating shaft and the impeller to rotate to achieve the delivery and spraying of liquid. Since this is a mature existing technology, it will not be described in detail here.

[0029] like Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, a protective structure is installed outside the pump head 11 for noise reduction. The protective structure includes a cover 20, sound-absorbing panels 21, and an interference channel 22. The cover 20 is fixedly installed outside the pump head 11. Several sound-absorbing panels 21 are fixedly arranged on the inner wall of the cover 20. An interference channel 22 for interfering with sound waves is formed between two adjacent sound-absorbing panels 21. The cover 20 is a cylindrical structure. A window for the pump head 11 to enter is opened at the end of the cover 20. The cover 20 is radially divided into two separate shell structures. The shell structures are bolted to the pump head 11. 1. Locking and fixing: The sound-absorbing plate 21 is an arc-shaped plate. The sound-absorbing plate 21 is fixedly installed on the inner wall of the cover 20. A gap is left between the sound-absorbing plate 21 and the outer wall of the pump head 11. The protective structure also includes an extension 23. An extension 23 is provided on each side of the sound-absorbing plate 21. An interference channel 22 is formed between two adjacent extensions 23. The extension 23 is integrally formed with the sound-absorbing plate 21. The extension 23 extends obliquely towards the center of the sound-absorbing plate 21. An interference channel 22 with a gradually narrowing opening and a funnel shape is formed between two adjacent extensions 23.

[0030] In this solution, in order to suppress the propagation and diffusion of noise generated during the impeller's extrusion of liquid, multiple sound-absorbing panels 21 are installed on the inner wall of the cover 20. Interference channels 22 are formed by the extensions 23 on both sides of the sound-absorbing panels 21, so that the inner wall of the cover 20 forms an uneven interference surface. The sound waves generated by the impeller impacting the liquid can be gradually absorbed by the interference surface, suppressing the propagation and diffusion of sound waves, thereby reducing the conveying noise. The separate cover 20 facilitates the later addition of protective structures, and the sound-absorbing panels 21 and extensions 23 can be easily replaced individually after aging and damage.

[0031] like Figure 6 As shown, the protective structure also includes a first interference groove 24 and a dispersion hole 25. A plurality of first interference grooves 24 are opened on one side of the sound-absorbing plate 21, and a plurality of dispersion holes 25 are opened on one side of the extension 23. The sound-absorbing plate 21 forms a reflective surface through a plurality of first interference grooves 24, and the extension 23 forms a sawtooth surface through a plurality of dispersion holes 25. The first interference groove 24 is a groove with a trapezoidal cross section and extends from one end of the sound-absorbing plate 21 to the other end. The dispersion hole 25 is a funnel-shaped groove and extends obliquely from the bottom to the top of the extension 23.

[0032] As a supplementary explanation to the above solution, by opening several first interference grooves 24 at the end of the sound-absorbing plate 21 and several dispersion holes 25 at the bottom of the extension 23, since the interference channel 22 formed between the two extensions 23 is funnel-shaped, the sound diffuses towards the outer circumference of the cover 20. The dispersion holes 25 of the funnel make the edge of the extension 23 form a sawtooth surface, so that the sound wave can be initially interfered and dispersed before entering the interference channel 22. Combined with the reflective surface formed by the multiple first interference grooves 24 at the bottom of the sound-absorbing plate 21, the sound wave is further interfered and dispersed, consuming the propagation energy of the sound wave, and achieving the purpose of continuously attenuating the sound wave to suppress noise. When conveying liquid, the sound of liquid squeezing and colliding with the pump head 11 is reduced, and finally the purpose of noise reduction is achieved.

[0033] The working principle of this utility model is as follows: By installing multiple sound-absorbing panels 21 on the inner wall of the cover 20, and forming interference channels 22 through the extensions 23 on both sides of the sound-absorbing panels 21, the inner wall of the cover 20 forms an uneven interference surface. The sound waves generated by the impeller hitting the liquid can be gradually absorbed by the interference surface, suppressing the propagation and diffusion of the sound waves. Since the interference channel 22 formed between the two extensions 23 is funnel-shaped, the sound diffuses towards the outer circumference of the cover 20. The dispersion holes 25 of the funnel make the edge of the extension 23 form a sawtooth surface, so the sound waves can be initially interfered and dispersed before entering the interference channel 22. In conjunction with the reflective surface formed by the multiple first interference grooves 24 at the bottom of the sound-absorbing panels 21, the sound waves are further interfered and dispersed, consuming the propagation energy of the sound waves, and achieving the purpose of suppressing noise by continuously attenuating the sound waves, thereby reducing the noise during the liquid delivery and spraying process.

[0034] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A low noise eductor pump set, characterized by, include: A motor (10) is provided, and a pump head (11) is fixedly installed on one side of the motor (10). The output shaft of the motor (10) is fixedly connected to the input end of the pump head (11). A protective structure is set outside the pump head (11) for noise reduction. The protective structure includes a cover (20), a sound-absorbing plate (21), and an interference channel (22). The cover (20) is fixedly installed outside the pump head (11). Several sound-absorbing plates (21) are fixedly arranged on the inner wall of the cover (20). An interference channel (22) for interfering with sound waves is formed between two adjacent sound-absorbing plates (21).

2. The low noise eductor pump set of claim 1, wherein: The cover (20) is a cylindrical structure. The end of the cover (20) is provided with a window for the pump head (11) to enter. The cover (20) is cut open radially into two separate shell structures. The shell structures are locked and fixed to the pump head (11) by bolts.

3. The low noise eductor pump set of claim 1, wherein: The sound-absorbing plate (21) is an arc-shaped plate. The sound-absorbing plate (21) is fixedly installed on the inner wall of the cover (20). There is a gap between the sound-absorbing plate (21) and the outer wall of the pump head (11).

4. The low noise eductor pump set of claim 1, wherein: The protective structure also includes an extension (23), with an extension (23) on each side of the sound-absorbing panel (21), and an interference channel (22) is formed between two adjacent extensions (23).

5. The low noise eductor pump set of claim 4, wherein: The extension (23) is integrally formed with the sound-absorbing plate (21). The extension (23) extends obliquely toward the center of the sound-absorbing plate (21). An interference channel (22) with a gradually narrowing opening and a funnel shape is formed between two adjacent extensions (23).

6. The low noise eductor pump set of claim 1, wherein: The protective structure also includes a first interference groove (24) and a dispersion hole (25). A plurality of first interference grooves (24) are opened on one side of the sound-absorbing plate (21), and a plurality of dispersion holes (25) are opened on one side of the extension (23). The sound-absorbing plate (21) forms a reflective surface through a plurality of first interference grooves (24), and the extension (23) forms a sawtooth surface through a plurality of dispersion holes (25).

7. The low noise eductor pump set of claim 6, wherein: The first interference groove (24) is a groove with a trapezoidal cross section. The first interference groove (24) extends from one end of the sound-absorbing plate (21) to the other end. The dispersion hole (25) is a funnel-shaped groove. The dispersion hole (25) extends obliquely from the bottom of the extension (23) to the top.

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