CN214366681U - A booster pump subassembly for purifier - Google Patents

Abstract

The utility model discloses a booster pump subassembly for purifier, include the booster pump and wrap up in the outside pump case of booster pump, be equipped with a plurality of first concave parts and a plurality of first convex parts on the internal perisporium of pump case, it is a plurality of first concave part and first convex part set up along the circumference of pump case in turn, first concave part with all be equipped with between first convex part and the booster pump and fall the clearance of making an uproar, just fall the clearance of making an uproar between first convex part and the booster pump and be greater than fall the clearance of making an uproar between first concave part and the booster pump, the perisporium thickness of pump case is 2mm ~ 5 mm. The utility model provides a technical scheme is when the noise that the booster pump produced transmits the inner wall face to the pump case for acoustic energy constantly by reflection, refraction and consumed gradually in the not equidimension clearance of making an uproar of falling, and partial acoustic energy is absorbed in addition, thereby makes noise intensity show and reduces, and the noise of spreading to the pump case outside is showing and lowers down, has reduced the noise that the booster pump produced effectively, has promoted the noise reduction effect of pump case.

Description

A booster pump subassembly for purifier

Technical Field

The invention relates to the technical field of water purifying equipment, in particular to a booster pump assembly for a water purifier.

Background

Present anti-infiltration purifier all needs to use the booster pump to give the system water efficiency of running water pressure boost in order to improve the purifier, but the booster pump during operation can produce vibrations and produce the noise, and the flux of purifier is big more moreover, and the noise of booster pump is also big more, and this becomes the use pain point of current reverse osmosis water purifier. In order to solve the pain point, the pump casing is usually sleeved outside the booster pump to reduce noise transmission or the damping sleeve is sleeved on the booster pump to reduce vibration in the prior art, but the noise reduction effect is not good. In addition, when reverse osmosis water purification machine during operation, the business turn over water pipe of being connected with the booster pump also produces great noise because of rivers process, and the travelling comfort when seriously influencing the user and using.

Disclosure of Invention

The invention aims to provide a booster pump assembly for a water purifier, which can effectively reduce the noise of the booster pump.

In order to solve the technical problems, the invention is realized by the following technical scheme:

the utility model provides a booster pump subassembly for purifier, includes the booster pump and wraps up in the outside pump case of booster pump, be equipped with a plurality of first concave parts and a plurality of first convex parts on the internal perisporium of pump case, it is a plurality of first concave part and first convex part set up along the circumference of pump case in turn, first concave part with all be equipped with between first convex part and the booster pump and fall the clearance of making an uproar, just fall the clearance of making an uproar between first convex part and the booster pump and be greater than fall the clearance of making an uproar between first concave part and the booster pump, the perisporium thickness of pump case is 2mm ~ 5 mm.

Further, booster pump subassembly still includes inlet tube and outlet pipe, the inlet tube with the water inlet of booster pump is connected, the outlet pipe with the delivery port of booster pump is connected, inlet tube and outlet pipe at least one are the parcel and are in the pump case.

Furthermore, the position on the inner peripheral wall of the pump shell corresponding to the water inlet pipe and the water outlet pipe is the first convex part.

Further, the inner diameter of the water inlet pipe is not smaller than that of the water outlet pipe.

Furthermore, ribs extending along the length direction of the first concave part are arranged on the inner wall of the first concave part.

Further, booster pump subassembly still includes the shock attenuation cover, the shock attenuation cover is located the pump body periphery side of booster pump just is located between booster pump and the pump case, be equipped with a plurality of second recesses and a plurality of second convex part on the shock attenuation cover, at least one the second recess corresponds the setting with at least one first convex part, at least one the second convex part corresponds the setting with at least one first concave part.

Further, the plurality of second concave portions and the plurality of first convex portions are arranged in a one-to-one correspondence manner, and the plurality of second convex portions and the plurality of first concave portions are arranged in a one-to-one correspondence manner.

Furthermore, a step surface is arranged on the peripheral wall of the damping sleeve, ribs extending along the length direction of the first concave portion are arranged on the inner wall of the first concave portion, one end of each rib abuts against the step surface, and the end surface of the pump head of the booster pump abuts against the inner end surface of the pump shell.

Further, the inner end face of the pump shell is provided with a shock pad, and the end face of the pump head of the booster pump abuts against the shock pad.

Further, the booster pump assembly further comprises shock absorbing pads arranged between the pump head end surface of the booster pump and the inner end surface of the pump shell and between the pump tail end surface of the booster pump and the inner end surface of the pump shell.

Compared with the prior art, the invention has the beneficial effects that:

1. the inner peripheral wall of the pump shell is provided with a plurality of first concave parts and a plurality of first convex parts, the first concave parts and the first convex parts are alternately arranged along the circumferential direction of the pump shell, noise reduction gaps are arranged between the first concave parts and the first convex parts and the booster pump, the noise reduction gaps between the first convex parts and the booster pump are larger than the noise reduction gaps between the first concave parts and the booster pump, and the thickness of the peripheral wall of the pump shell is 2 mm-5 mm, so that when noise generated by the booster pump is transmitted to the inner wall surface of the pump shell, the noise reduction gaps between the first concave parts and the first convex parts and the booster pump are respectively arranged, the noise reduction gaps between the first convex parts and the booster pump are respectively larger than the noise reduction gaps between the first concave parts and the booster pump, and the sound wave energy is continuously reflected and refracted in the noise reduction gaps with different sizes and is gradually consumed, and part of the sound wave energy is absorbed, thereby make noise intensity show the reduction, the noise of spreading to the pump case outside is showing and is reducing, has reduced the noise that the booster pump produced effectively, has promoted the noise reduction effect of pump case. In addition, compared with the traditional sound-absorbing wedge structure, the pump shell structure is simple in structure, convenient to process and prepare and capable of improving the processing efficiency; when the thickness of the peripheral wall of the pump shell is less than 2mm, the pump shell has low processing forming rate and mechanical strength and poor sound insulation effect; when the thickness of the peripheral wall of the pump shell is larger than 5mm, when the booster pump is fixed on the machine body, the fixed connection part is easy to break due to the fact that the pump shell is too heavy, the weight of the whole machine is increased, and manufacturing cost is increased.

2. The booster pump subassembly still includes inlet tube and outlet pipe, the inlet tube with the water inlet of booster pump is connected, the outlet pipe with the delivery port of booster pump is connected, inlet tube and outlet pipe at least one are the parcel and are in the pump case, so, when the booster pump carries out the during operation, rivers can have certain impact and produce the noise to the pipe wall when flowing through inlet tube and outlet pipe, the acoustic wave frequency that the acoustic wave frequency of this noise and booster pump during operation produced is different and has certain phase difference, and the acoustic wave energy of two kinds of different acoustic wave frequency sound superposes in the confined pump case and offsets for propagate to the outer noise further reduction of pump case, promote the noise reduction of booster pump subassembly greatly.

3. The positions, corresponding to the water inlet pipe and the water outlet pipe, on the inner peripheral wall of the pump shell are the first convex parts, and the noise reduction effect of the pump shell on noise generated by the water inlet pipe and the water outlet pipe is improved.

4. The inner diameter of the water inlet pipe is not smaller than that of the water outlet pipe, so that the flow of the water inlet pipe can be ensured to increase the water inlet flow of the booster pump, the water outlet flow of the water purifier is ensured under the condition of smaller water inlet pressure, and the efficiency of the water purifier is improved; and when the internal diameter of outlet pipe is less than the internal diameter of inlet tube, can reduce the flow of outlet pipe for carry out the throttle step-down to rivers in the outlet pipe, thereby reduce the pressure pulsation in the outlet pipe, reduce the noise that rivers produced when flowing through the outlet pipe, reduce the noise of booster pump subassembly.

5. The inner wall of the first concave part is provided with ribs extending along the length direction of the first concave part, so that the sound wave energy is further reflected and refracted to be consumed and absorbed, and the purpose of secondary noise reduction is achieved.

6. The booster pump assembly further comprises a damping sleeve, the damping sleeve is sleeved on the outer peripheral side of a pump body of the booster pump and located between the booster pump and the pump shell, a plurality of second concave parts and a plurality of second convex parts are arranged on the damping sleeve, at least one second concave part is arranged corresponding to at least one first convex part, and at least one second convex part is arranged corresponding to at least one first concave part, so that when noise generated by the booster pump is firstly transmitted to the inner wall surface of the damping sleeve, sound wave energy is continuously reflected and refracted between the second concave parts and the second convex parts and is gradually consumed, part of sound wave energy is also absorbed, and then the rest sound wave energy is transmitted to a noise reduction gap formed between the pump shell and the damping sleeve, so that the sound wave energy is further reflected and refracted and is gradually consumed and absorbed to form the purpose of secondary noise reduction, the purpose of remarkably improving the noise reduction effect of the pump shell is achieved.

7. Be equipped with the step face on the perisporium of shock attenuation cover, be equipped with the rib that extends along first concave part length direction on the inner wall of first concave part, the one end butt of rib in the step face, just the pump head terminal surface butt of booster pump in the interior terminal surface of pump case for the booster pump is fixed in the pump case, prevents that the booster pump from shaking in the pump case and leading to the vibration frequency increase, effectively keeps apart the booster pump as the vibration source, has effectively reduced the complete machine vibrations of purifier, and then effectively reduces the noise of purifier during operation, promotes user's use and experiences.

8. The inner end face of the pump shell is provided with a shock pad, the end face of the pump head of the booster pump is abutted to the shock pad, the fixing reliability of the booster pump is further improved, and the transmission of vibration is reduced.

9. The booster pump subassembly is still including setting up between the pump head terminal surface of booster pump and the interior terminal surface of pump case and the shock pad between the pump tail terminal surface of booster pump and the interior terminal surface of pump case for the booster pump is fixed in the pump case, prevents that the booster pump from shaking in the pump case and leading to the vibration frequency increase, effectively keeps apart the booster pump as the vibration source, has effectively reduced the complete machine vibrations of purifier, and then effectively reduces the noise of purifier during operation, promotes user's use and experiences.

Drawings

Fig. 1 is a schematic structural diagram of a water purifier according to an embodiment;

FIG. 2 is a schematic diagram of an internal structure of a water purifier according to an embodiment;

FIG. 3 is a schematic diagram illustrating an exemplary booster pump assembly;

FIG. 4 is an exploded view of a booster pump assembly according to an embodiment;

FIG. 5 is a schematic view of a portion of a pump casing according to an embodiment;

FIG. 6 is a partial schematic view of another angular aspect of a pump casing according to an embodiment;

FIG. 7 is a schematic view of a shock-absorbing sleeve according to an embodiment;

FIG. 8 is a schematic diagram of the internal structure of a booster pump assembly according to an embodiment;

FIG. 9 is a schematic view of a portion of a pump casing according to another embodiment of the present invention;

FIG. 10 is an exploded view of a booster pump assembly of an embodiment two;

FIG. 11 is a schematic structural view of a damping sleeve according to a second embodiment;

FIG. 12 is a schematic illustration of the internal construction of a second booster pump assembly according to an embodiment;

reference numerals:

1, a shell; 2, a filter element; 3, a bracket; 4 booster pump component, 41 booster pump, 411 water inlet joint, 412 water outlet joint, 42 pump shell, 421 upper pump shell, 422 lower pump shell, 423 first concave part, 424 first convex part, 425 rib, 426 pump shell inner contour line; 43 damping sleeve, 431 second concave part, 432 second convex part, 433 step surface; 44 a water inlet pipe; 45, a water outlet pipe; 46 shock absorbing pad.

Detailed Description

The technical scheme of the application is further explained by the specific implementation mode in combination with the attached drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not limiting of the application.

As shown in fig. 1 to 12, the present invention provides a booster pump assembly for a water purifier, which includes a booster pump and a pump casing that is totally enclosed and wrapped outside the booster pump, wherein the inner peripheral wall of the pump casing is provided with a plurality of first recesses and a plurality of first protrusions, the plurality of first recesses and the plurality of first protrusions are alternately arranged along the circumferential direction of the pump casing, noise reduction gaps are respectively arranged between the first recesses and the first protrusions and the booster pump, the noise reduction gap between the first protrusions and the booster pump is larger than the noise reduction gap between the first recesses and the booster pump, and the thickness of the peripheral wall of the pump casing is 2mm to 5 mm. When the noise that the booster pump produced transmits the inner wall face to the pump case, the clearance of making an uproar that all is equipped with between first concave part and the booster pump, and the clearance of making an uproar that falls between first convex part and the booster pump is greater than the clearance of making an uproar that falls between first concave part and the booster pump, make sound wave energy constantly reflected in the clearance of making an uproar that falls of equidimension not, refract and be consumed gradually, and partial sound wave energy is absorbed in addition, thereby make noise intensity show to be reduced, the noise of spreading outside the pump case is showing to be reduced, the noise that the booster pump produced has been reduced effectively, the noise reduction effect of pump case has been promoted. In addition, compared with the traditional sound-absorbing wedge structure, the pump shell structure is simple in structure, convenient to process and prepare and capable of improving the processing efficiency; when the thickness of the peripheral wall of the pump shell is less than 2mm, the pump shell has low processing forming rate and mechanical strength and poor sound insulation effect; when the thickness of the peripheral wall of the pump shell is larger than 5mm, when the booster pump is fixed on the machine body, the fixed connection part is easy to break due to the fact that the pump shell is too heavy, the weight of the whole machine is increased, and manufacturing cost is increased.

The technical solution of the water purifier according to the exemplary embodiment of the present invention is described below with reference to the accompanying drawings.

Example one

As shown in fig. 1 to 5, the present invention provides a water purifier, the water purifier includes a casing 1, a bracket 2 sleeved in the casing 1, and a filter element 2 and a booster pump assembly 4 arranged in parallel in the bracket 3, the booster pump assembly 4 includes a booster pump 41 and a pump housing 42 fully enclosed outside the booster pump 41, the inner peripheral wall of the pump housing 42 is provided with a plurality of first recesses 423 and a plurality of first protrusions 424, the plurality of first recesses 423 and the plurality of first protrusions 424 are alternately arranged along the circumferential direction of the pump housing 42, noise reduction gaps are provided between the first recesses 423 and the first protrusions 424 and the booster pump 41, and the noise reduction gaps between the first protrusions 424 and the booster pump 41 are larger than the noise reduction gaps between the first recesses 423 and the booster pump 41. When the noise that the booster pump produced transmits the inner wall face to the pump case, the clearance of making an uproar that all is equipped with between first concave part and the booster pump, and the clearance of making an uproar that falls between first convex part and the booster pump is greater than the clearance of making an uproar that falls between first concave part and the booster pump, make sound wave energy constantly reflected in the clearance of making an uproar that falls of equidimension not, refract and be consumed gradually, and partial sound wave energy is absorbed in addition, thereby make noise intensity show to be reduced, the noise of spreading outside the pump case is showing to be reduced, the noise that the booster pump produced has been reduced effectively, the noise reduction effect of pump case has been promoted. In addition, traditional sound wedge structure of inhaling is compared to this pump case structure, simple structure, and the processing preparation of being convenient for improves machining efficiency.

In the present embodiment, the peripheral wall thickness of the pump case 42 is 2mm to 5mm, and when the peripheral wall thickness of the pump case is less than 2mm, the pump case has a low processing molding rate, low mechanical strength, and a poor sound insulation effect; when the thickness of the peripheral wall of the pump shell is larger than 5mm, when the booster pump is fixed on the machine body, the fixed connection part is easy to break due to the fact that the pump shell is too heavy, the weight of the whole machine is increased, and manufacturing cost is increased.

In the present embodiment, the pump casing 42 includes an upper pump casing 421 and a lower pump casing 422, the upper pump casing 421 and the lower pump casing 422 together enclose a receiving cavity of the booster pump 41, and the upper pump casing 421 and the lower pump casing 422 are fixedly connected by a fastener. The inner peripheral walls of the upper pump shell 421 and the lower pump shell 422 are respectively provided with a plurality of first concave parts and a plurality of first convex parts, the first concave parts and the first convex parts are alternately arranged along the circumferential direction of the pump shell, noise reduction gaps are arranged between the first concave parts and the first convex parts and the booster pump, and the noise reduction gaps between the first convex parts and the booster pump are larger than the noise reduction gaps between the first concave parts and the booster pump.

As shown in fig. 6, in the present embodiment, an intersection line between an inner surface of a peripheral wall of the pump casing 42 and a cross section of the pump casing 42 is a pump casing inner contour line, a height difference between a most convex point and a most concave point on the pump casing inner contour line of the adjacent first convex portion 424 and first concave portion 423 is D1, and a thickness of the peripheral wall of the pump casing 42 is D2 and 1.6D2 ≤ D1 ≤ 8D2, so that noise generated by a vibration frequency between 100HZ and 500HZ can be significantly reduced, and a noise reduction effect of the pump casing can be improved.

The vibration frequency of a booster pump of the existing reverse osmosis water purifier is usually 500HZ to 225HZ, and when D1/D2 is 1.6-3.55, the noise reduction rate of the booster pump is more than 98%; when the vibration frequency of the booster pump is 225HZ, the D1/D2 is 3.55, and when the vibration frequency of the booster pump is 500HZ, the D1/D2 is 1.6; when the vibration frequency of the booster pump is 200HZ, D1/D2 is 4.

In this embodiment, the booster pump assembly 4 further comprises a water inlet pipe 44 and a water outlet pipe 45, the booster pump 41 has a water inlet joint 411 and a water outlet joint 412, the water inlet joint 411 and the water outlet joint 412 are respectively provided with a water inlet and a water outlet, the water inlet is connected with a water inlet pipe 44, the water outlet is connected with a water outlet pipe 45, at least one of the water inlet pipe 44 and the water outlet pipe 45 is wrapped in the pump shell 42, thus, when the booster pump works, water flow passes through the water inlet pipe and the water outlet pipe and has certain impact on the pipe wall to generate noise, the sound wave frequency of the noise is different from the sound wave frequency generated when the booster pump works and has a certain phase difference, the sound wave energy of the sound with two different sound wave frequencies is superposed and offset in the closed pump shell, the noise transmitted to the outside of the pump shell is further reduced, and the noise reduction effect of the booster pump assembly is greatly improved.

Preferably, the water inlet pipe 44 and the water outlet pipe 45 are both wrapped in the pump housing 42.

In this embodiment, the positions of the peripheral wall of the pump housing 42 corresponding to the water inlet pipe 44 and the water outlet pipe 45 are the first protrusions 424, and the back surfaces of the first protrusions 424 corresponding to the water inlet pipe 44 and the water outlet pipe 45 form a containing cavity for containing the water inlet pipe 44 and the water outlet pipe 45, so that the noise reduction effect of the pump housing 42 on the noise generated by the water inlet pipe and the water outlet pipe is improved.

In this embodiment, the inner diameter of the water inlet pipe 44 is not smaller than the inner diameter of the water outlet pipe 45, so that the flow of the water inlet pipe can be ensured to increase the water inlet flow of the booster pump, the water outlet flow of the water purifier can be ensured under the condition of smaller water inlet pressure, and the efficiency of the water purifier can be improved; and when the internal diameter of outlet pipe is less than the internal diameter of inlet tube, can reduce the flow of outlet pipe for carry out the throttle step-down to rivers in the outlet pipe, thereby reduce the pressure pulsation in the outlet pipe, reduce the noise that rivers produced when flowing through the outlet pipe, reduce the noise of booster pump subassembly.

Generally, the frequency of the water inlet pipe 44 and the water outlet pipe 45, which is caused by the water flow, is generally 300HZ to 100HZ, the height difference between the most convex point and the most concave point on the pump casing inner contour line of the first convex part 424 and the first concave part 423 adjacent to the first convex part 424 corresponding to the water inlet pipe 44 and the water outlet pipe 45 is D1, the thickness of the peripheral wall of the pump casing 42 is D2, and the thickness of D1/D2 is 2.66-8, so that the noise generated by the pump casing on the water inlet pipeline and the water outlet pipeline can be obviously reduced.

As shown in fig. 7 and 8, in the present embodiment, the booster pump assembly 4 further includes a damper sleeve 43, the damper sleeve 43 is sleeved on the outer periphery of the pump body of the booster pump 41 and is located between the booster pump 41 and the pump housing 42, a plurality of second concave portions 431 and a plurality of second convex portions 432 are provided on the damper sleeve 43, at least one of the second concave portions 431 is provided corresponding to at least one of the first convex portions 424, and at least one of the second convex portions 432 is provided corresponding to at least one of the first concave portions 423. When noise generated by the booster pump is transmitted to the inner wall surface of the damping sleeve firstly, sound wave energy is continuously reflected and refracted between the second concave parts and the second convex parts and is gradually consumed, part of sound wave energy is absorbed, and then the rest sound wave energy is transmitted to a noise reduction gap formed between the pump shell and the damping sleeve, so that the sound wave energy is further reflected and refracted and is gradually consumed and absorbed, the purpose of secondary noise reduction is achieved, and the purpose of remarkably improving the noise reduction effect of the pump shell is achieved.

Preferably, the plurality of second recesses 431 are arranged in one-to-one correspondence with the plurality of first recesses 424, and the plurality of second protrusions 432 are arranged in one-to-one correspondence with the plurality of first recesses 423, so that an annular sound deadening space formed between the pump housing and the damper sleeve can be further enlarged, and the sound wave energy transmitted through the damper sleeve is sufficiently reflected and refracted in the annular sound deadening space to be gradually consumed and absorbed, thereby improving the secondary noise reduction effect and better realizing the noise reduction effect of the pump housing.

In this embodiment, booster pump subassembly 4 is still including setting up between the pump head terminal surface of booster pump 41 and the interior terminal surface of pump case 42 and shock pad 46 (not shown in the figure) between the pump tail terminal surface of booster pump 41 and the interior terminal surface of pump case 42 for the booster pump is fixed in the pump case, prevents that the booster pump from shaking in the pump case and leading to the vibration frequency increase, effectively keeps apart the booster pump as the vibration source, has effectively reduced the complete machine vibrations of purifier, and then effectively reduces the noise of purifier during operation, and the promotion user uses experience.

It will be appreciated that the shock absorbing pad is provided on the inner end surface of the pump housing 42 by means of adhesive.

As shown in fig. 9, in another embodiment of the present embodiment, ribs extending along the longitudinal direction of the first concave part 423 are provided on the inner wall of the first concave part 423, and further the acoustic energy is reflected, refracted, consumed and absorbed, thereby achieving the purpose of secondary noise reduction.

It is understood that the ribs are provided on the inner wall of the first recess 423 of the lower pump case 422 and/or the upper pump case 421.

It is understood that the shock-absorbing sheath 43 and the shock-absorbing pad 46 are made of an elastic material, such as a silicone material; preferably, the shock-absorbing sheath 43 and the shock-absorbing pad 46 are both made of SEBS-based TPE thermoplastic elastomer.

Example two

As shown in fig. 10 to 12, in the second embodiment of the present invention, different from the first embodiment, in the second embodiment, a step surface 433 is disposed on a circumferential wall of the damping sleeve 43, a rib 425 extending along a length direction of the first concave portion 423 is disposed on an inner wall of the first concave portion 423, one end of the rib 425 abuts against the step surface 433, and a pump head end surface of the booster pump 41 abuts against an inner end surface of the pump housing 42, so that the booster pump is fixed in the pump housing, the booster pump is prevented from vibrating in the pump housing to increase a vibration frequency, the booster pump serving as a vibration source is effectively isolated, vibrations of the entire water purifier are effectively reduced, noises generated when the water purifier operates are effectively reduced, and user experience is improved.

Preferably, the inner end surface of the pump housing 42 is provided with a shock pad 46, and the end surface of the pump head of the booster pump 41 abuts against the shock pad 46, so as to further improve the fixing reliability of the booster pump and reduce the transmission of vibration.

It will be appreciated that the shock absorbing pad 46 is adhesively disposed on the inner end surface of the pump housing 42.

Other undescribed features and technical effects in this embodiment are the same as those in the first embodiment, and are not described herein again.

In the description of the embodiments of the present application, unless otherwise explicitly stated or limited, the terms "connected," "fixedly connected," "mounted," and "assembled" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; the terms "mounted," "connected," and "fixedly connected" may be directly connected or indirectly connected through intervening elements, or may be connected through the interconnection between two elements. Specific meanings of the above terms in the embodiments of the present application can be understood in specific cases by those of ordinary skill in the art.

Claims (10)

1. The utility model provides a booster pump subassembly for purifier, includes the booster pump and wraps up in the outside pump case of booster pump, its characterized in that, be equipped with a plurality of first recesses and a plurality of first convex part on the internal perisporium of pump case, it is a plurality of first recess and first convex part set up along the circumference of pump case in turn, first recess with all be equipped with between first convex part and the booster pump and fall the clearance of making an uproar, just fall the clearance of making an uproar between first convex part and the booster pump and be greater than fall the clearance of making an uproar between first recess and the booster pump, the perisporium thickness of pump case is 2mm ~ 5 mm.

2. The booster pump assembly for a water purifier as recited in claim 1, further comprising a water inlet pipe and a water outlet pipe, said water inlet pipe being connected to a water inlet of said booster pump, said water outlet pipe being connected to a water outlet of said booster pump, at least one of said water inlet pipe and said water outlet pipe being enclosed within said pump housing.

3. The booster pump assembly for a water purifier as recited in claim 2, wherein the first protrusion is formed on the inner circumferential wall of the pump housing at a position corresponding to the water inlet pipe and the water outlet pipe.

4. The booster pump assembly for a water purifier as recited in claim 2, wherein an inner diameter of the water inlet pipe is not less than an inner diameter of the water outlet pipe.

5. The booster pump assembly for a water purifier as recited in claim 1, wherein ribs extending along a length of the first recess are provided on an inner wall of the first recess.

6. The booster pump assembly for the water purifier as recited in claim 1, further comprising a damping sleeve, wherein the damping sleeve is disposed on an outer peripheral side of a pump body of the booster pump and located between the booster pump and the pump casing, the damping sleeve is provided with a plurality of second recesses and a plurality of second protrusions, at least one of the second recesses corresponds to at least one of the first protrusions, and at least one of the second protrusions corresponds to at least one of the first recesses.

7. The booster pump assembly for a water purifier as recited in claim 6, wherein a plurality of said second recesses are provided in one-to-one correspondence with a plurality of said first protrusions, and a plurality of said second protrusions are provided in one-to-one correspondence with a plurality of said first recesses.

8. A booster pump assembly for a water purifier as defined in claim 6, wherein a step surface is provided on a circumferential wall of the damping sleeve, a rib extending along a length direction of the first recess is provided on an inner wall of the first recess, one end of the rib abuts against the step surface, and a pump head end surface of the booster pump abuts against an inner end surface of the pump housing.

9. A booster pump assembly for a water purifier as recited in claim 8, wherein said pump housing has a shock pad at an inner end surface thereof, said booster pump having a pump head end surface abutting against said shock pad.

10. The booster pump assembly for a water purifier as recited in any one of claims 1 to 7, further comprising shock absorbing pads disposed between a head end surface of the booster pump and an inner end surface of the pump housing and between a tail end surface of the booster pump and the inner end surface of the pump housing.

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