CN116906341A - Mute pipeline permanent magnet centrifugal pump - Google Patents

Abstract

The invention discloses a mute pipeline permanent magnet centrifugal pump which comprises a pump pipe, a water inlet connecting seat, a water outlet connecting seat, a centrifugal pump body and a submersible motor. The submersible motor comprises a rotor assembly, a stator assembly, a shielding assembly and a motor housing, wherein the shielding assembly comprises a shielding sleeve and a shielding cover. The shaft body passes through the shielding cover in a clearance fit manner and is fixedly connected with the impeller, the shielding cover is provided with a micro-filtration hole which is communicated with the sealing cavity and has the aperture of 0.2 to 0.4 mm, and the ratio of the aperture of the micro-filtration hole to the clearance size between the shaft body and the shielding cover is 1:1.1 to 1:1.2, a reflux channel with an inlet communicated with the sealing cavity and an outlet communicated with the working cavity is arranged in the shaft body; the permanent magnet centrifugal pump of the mute pipeline can filter water bodies which enter the sealing cavity and cool and lubricate the shaft body, the water bodies in the pump pipe enter the sealing cavity from the micro-filtration holes rapidly in a suction mode, and then are conveyed into a working cavity where an impeller of the centrifugal pump body is located along a backflow channel, and finally are sent out by a water outlet connecting seat.

Description

Mute pipeline permanent magnet centrifugal pump

Technical Field

The invention relates to a pump for liquid delivery, in particular to a mute pipeline permanent pump centrifugal pump.

Background

Pumps are widely known for use in various liquid delivery applications, such as underground tap water delivery to high levels.

In the canned motor pump in pipe disclosed in chinese patent application No. 202211416886.9, lubrication and cooling of both the lower bearing and the rotor are achieved by forming an internal and external circulation inflation channel of the motor together with a water inlet central hole, a water inlet channel and a water filtering hole of a lower sealing cover; meanwhile, the stator is fixedly arranged in a closed space surrounded by the upper end ring, the lower end ring, the motor shell and the non-magnetic shielding sleeve.

However, in the canned type pump in pipe disclosed in chinese patent application No. 202211416886.9, since lubrication and cooling of both the lower bearing and the rotor are achieved by forming the internal and external circulation air charging channels of the motor together by the water inlet central hole, the water inlet channel and the water filtering hole of the lower cover, the water inlet coupling seat enters the water inlet central hole, the water inlet central hole and the water inlet channel in the pump pipe in sequence, and then flows out from the water inlet channel to the water inlet central hole and the water filtering hole in sequence, so that the water flow speed is slow, resulting in poor cooling effect; meanwhile, the device can not effectively filter out tiny impurities such as sand and stone in the water body, so that friction between the bearing and the rotor is increased and the rotation of the rotor is influenced due to the entering of the tiny impurities; furthermore, the enclosed space is surrounded by the upper end ring, the lower end ring, the motor housing and the non-magnetic shielding sleeve, so that the structure is complex.

Accordingly, there is a great need for a silent pipe permanent magnet centrifugal pump that overcomes one or more of the above-described drawbacks.

Disclosure of Invention

The invention aims to provide a mute pipeline permanent magnet centrifugal pump which can filter a water body which enters a sealing cavity and cools and lubricates a shaft body so as to prevent tiny impurities such as sand and stone in the water body from entering the sealing cavity, realize that the water body in a pump pipe rapidly enters the sealing cavity through a micro-filtration hole in a suction mode, then is conveyed into a working cavity where an impeller of a centrifugal pump body is located along a backflow channel, and finally is sent out by a water outlet connecting seat.

In order to achieve the purpose, the mute pipeline permanent magnet centrifugal pump comprises a pump pipe, a water inlet connecting seat fixed at one end of the pump pipe, a water outlet connecting seat fixed at the other end of the pump pipe, a centrifugal pump body positioned in the pump pipe and adjacent to the water outlet connecting seat, and a submersible motor positioned in the pump pipe and adjacent to the water inlet connecting seat. The submersible motor comprises a rotor assembly, a stator assembly, a shielding assembly and a motor shell; the shielding assembly comprises a shielding sleeve and a shielding cover, wherein an inner space of the shielding sleeve forms a sealing cavity with a cavity opening facing the centrifugal pump body, the shielding cover is positioned between the shielding sleeve and the centrifugal pump body, and the shielding cover is also sealed and fixed with the shielding sleeve to seal the cavity opening; the rotor assembly is positioned in the sealing cavity, a shaft body in the rotor assembly passes through the shielding cover in a clearance fit manner and is fixedly connected with an impeller in the centrifugal pump body, the motor shell is sleeved on the shielding sleeve and is fixedly connected with the shielding sleeve in a sealing manner, and the stator assembly is fixedly positioned in a space defined by the motor shell and the shielding sleeve together; the shielding cover is provided with a micro-filtration hole which is communicated with the sealing cavity and has the aperture of 0.2 to 0.4 millimeter, and the ratio of the aperture of the micro-filtration hole to the gap size between the shaft body and the shielding cover is 1:1.1 to 1:1.2, a backflow channel is arranged in the shaft body, an inlet of the backflow channel is communicated with the sealing cavity, and an outlet of the backflow channel is communicated with a working cavity where an impeller in the centrifugal pump body is located.

Compared with the prior art, as the micro-filtration holes which are communicated with the sealing cavity and have the aperture of 0.2 to 0.4 millimeter are formed in the shielding cover, the ratio of the aperture of the micro-filtration holes to the gap size between the shaft body and the shielding cover is 1:1.1 to 1:1.2, a reflux channel is arranged in the shaft body, an inlet of the reflux channel is communicated with the sealing cavity, and an outlet of the reflux channel is communicated with a working cavity where an impeller in the centrifugal pump body is positioned; on one hand, the mute pipeline permanent magnet centrifugal pump can filter the water body which enters the sealing cavity and cools and lubricates the shaft body, so as to prevent tiny impurities such as sand and stone in the water body from entering the sealing cavity; on the other hand, the mute pipeline permanent magnet centrifugal pump can realize that the water body entering the pump pipe from the water inlet connecting seat flows into the sealing cavity from the micro-filtration hole rapidly in a suction mode, is conveyed into the working cavity where the impeller of the centrifugal pump body is positioned along the backflow channel, and is finally sent out from the water outlet connecting seat, so that the cooling effect is improved; meanwhile, the ratio of the aperture through the micro-filtration pores to the gap size between the shaft body and the shielding cover is 1:1.1 to 1:1.2, which is effectively used for controlling the water body in the pump pipe to mainly flow into the sealing cavity from the micro-filtration holes; in addition, because the submersible motor in the mute pipeline permanent magnet centrifugal pump is positioned in the pump pipe, the generated vibration is absorbed and taken away by the water in the pump pipe, and the purpose of mute is achieved.

Preferably, the rotor assembly comprises a shaft body and a rotor magnetic core, the shaft body axially penetrates through the rotor magnetic core from the center of the rotor magnetic core and protrudes out of the rotor magnetic core to form a first protruding end and a second protruding end, a first shaft sleeve is arranged at the center of the shielding cover, a second shaft sleeve positioned in the sealing cavity is arranged at the center of the shielding sleeve, which is far away from the shielding cover, the first protruding end penetrates through the first shaft sleeve in a clearance fit manner and is fixedly connected with the impeller, and the second protruding end penetrates through the second shaft sleeve in a clearance fit manner.

Preferably, the submersible motor further comprises a first stop assembly and a second stop assembly, the first stop assembly comprises a first rubber ring tightly sleeved on the first protruding end and a first stop ring embedded in and fixed to the first rubber ring, the first stop ring protrudes out of the first rubber ring axially and surrounds the first protruding end, the first stop ring also axially resists with the first shaft sleeve, and the first rubber ring axially resists with the rotor magnetic core; the second stop assembly comprises a second rubber ring tightly sleeved on the second protruding end and a second stop ring embedded in and fixed to the second rubber ring, the second stop ring protrudes axially out of the second rubber ring and surrounds the second protruding end, the second stop ring also axially resists the second sleeve, and the second rubber ring axially resists the rotor magnetic core.

Preferably, a plurality of first notches are formed in the position, protruding axially out of the first rubber ring, of the first stop ring, the first notches are arranged along the circumferential direction of the first stop ring in a spaced mode, the first notches are arranged in a radial extending mode of the first stop ring, a plurality of second notches are formed in the position, protruding axially out of the first rubber ring, of the second stop ring, the second notches are arranged along the circumferential direction of the second stop ring in a spaced mode, and the second notches are arranged along the radial extending mode of the second stop ring.

Preferably, the shielding sleeve is provided with an annular body axially arched towards the direction away from the second sleeve at a position away from the shielding cover, an opening of a space surrounded by the annular body is closed by the second sleeve, the second protruding end is exposed in the space surrounded by the annular body, and an inlet of the backflow channel is communicated with the space surrounded by the annular body.

Preferably, the annular body is bowl-shaped.

Preferably, the backflow channel is a straight line channel penetrating through the shaft body along the axial direction of the shaft body, the backflow channel is located at the center of the shaft body, and the outer contour of the backflow channel is circular.

Preferably, the inlet of the return channel is located at the end face of the second protruding end, and the outlet of the return channel is located at the end face of the first protruding end.

Preferably, the shaft body, the first shaft sleeve, the second shaft sleeve, the first stop ring and the second stop ring are made of ceramics respectively.

Preferably, the shielding sleeve is of an integrated structure formed by stamping and stretching, the centrifugal pump body is a multistage centrifugal pump body, a water inlet in the centrifugal pump body faces the inner side wall of the pump pipe, a water outlet in the centrifugal pump body is connected to the water outlet connecting seat, an outlet of the backflow channel is adjacent to the water outlet of the centrifugal pump body, and the water inlet connecting seat is respectively in sealing connection with the motor shell and the shielding sleeve, so that a closed space is formed by a space defined by the motor shell and the shielding sleeve together.

Drawings

Fig. 1 is a plan view of a silent pipe permanent magnet centrifugal pump of the present invention.

Fig. 2 is an interior view of the silent pipe permanent magnet centrifugal pump shown in fig. 1, taken along line A-A.

Fig. 3 is an interior view of fig. 2 after concealing the pump tube, centrifugal pump body, and outlet coupling.

Fig. 4 is an internal view of fig. 3 after being hidden into the water coupling socket.

Fig. 5 is an interior view of fig. 4 after concealing the rotor assembly.

Fig. 6 is an interior view of fig. 5 after concealing the stator assembly.

Fig. 7 is an interior view of a rotor assembly in the silent pipe permanent magnet centrifugal pump shown in fig. 2.

Fig. 8 is a perspective view of a first stop assembly in a silent pipe permanent magnet centrifugal pump of the present invention.

Fig. 9 is a perspective view of a second stop assembly in a silent pipe permanent magnet centrifugal pump of the present invention.

Detailed Description

In order to describe the technical content and constructional features of the present invention in detail, the following description will be made with reference to the embodiments in conjunction with the accompanying drawings.

Referring to fig. 1 to 2, a mute pipeline permanent magnet centrifugal pump 100 of the present invention includes a pump pipe 10, a water inlet coupling seat 20 fixed at one end of the pump pipe 10, a water outlet coupling seat 30 fixed at the other end of the pump pipe 10, a centrifugal pump body 40 positioned in the pump pipe 10 and adjacent to the water outlet coupling seat 30, and a submersible motor 50 positioned in the pump pipe 10 and adjacent to the water inlet coupling seat 20, optionally, in fig. 1 and 2, the water inlet coupling seat 20 is fixedly connected with the lower end of the pump pipe 10 in a sealing manner as an example to prevent the risk of water leakage at the fixed connection position of the water inlet coupling seat 20 and the pump pipe 10; the water outlet connecting seat 30 is fixedly connected with the upper end of the pump pipe 10 in a sealing way, so that the risk of water leakage at the fixed connection position of the water outlet connecting seat 30 and the pump pipe 10 is prevented. In addition, the centrifugal pump body 40 is a two-stage centrifugal pump body, so as to achieve the purposes of two-stage supercharging and acceleration of the water body; of course, the centrifugal pump body 40 may be designed as a primary, tertiary or quaternary centrifugal pump body according to practical needs, so it is not limited to fig. 2; alternatively, in fig. 2, as an example, the centrifugal pump body 40 includes a pump housing 40c, a working chamber 40b formed in the pump housing 40c, an impeller 40a located in the working chamber 40b, and a water inlet 41 and a water outlet 42 respectively formed on the pump housing 40c and communicated with the working chamber 40b, it is understood that when the centrifugal pump body 40 is a two-stage or more centrifugal pump body 40, the working chambers 40b at this time are two or more sequentially axially connected on the pump housing 40c, and correspondingly, each working chamber 40b is correspondingly provided with one impeller 40a, and the water inlet 41 is connected with the working chamber 40b far from the water outlet connecting seat 30, and the water outlet 42 is connected with the working chamber 40b adjacent to the water outlet connecting seat 30, as shown in fig. 2.

Referring again to fig. 3-6, submersible motor 50 includes a rotor assembly 51, a stator assembly 52, a shield assembly 53, and a motor housing 54. The shielding assembly 53 comprises a shielding sleeve 53a and a shielding cover 53b, wherein the inner space of the shielding sleeve 53a forms a sealed cavity 531 of the cavity opening 5311 facing the centrifugal pump body 40, the shielding cover 53b is positioned between the shielding sleeve 53b and the centrifugal pump body 40, and the shielding cover 53b is also sealed and fixed with the shielding sleeve 53a so as to seal the cavity opening 5311, and the state is shown in fig. 4 to 6; alternatively, in fig. 4 to 6, as an example, a first gasket 60 is provided between the shield cover 53B and the shield sleeve 53a, and the first gasket 60 is axially clamped (in the direction indicated by the arrow B and in the opposite direction) between the shield cover 53B and the shield sleeve 53a, so as to achieve sealing between the shield cover 53B and the shield sleeve 53a by means of the first gasket 60; of course, the sealing between the shielding cover 53b and the shielding sleeve 53a may be other manners, and is not limited to the embodiments shown in fig. 4 to 6; in addition, the shielding cover 53b is provided with a micro-filtration hole 531 which is communicated with the sealing cavity 531 and has a pore diameter of 0.2 to 0.4 mm (i.e. the pore diameter of the micro-filtration hole 531 is within 0.2 to 0.4 mm and contains two end points), alternatively, as an example, the micro-filtration hole 531 may be 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm or 0.4 mm, and since the size of the micro-impurities in the water body is greater than 0.4 mm, the micro-filtration hole 531 can effectively prevent the micro-impurities in the water body from flowing into the sealing cavity 531.

Meanwhile, the rotor assembly 51 is located in the sealing cavity 531, and the shaft body 51a in the rotor assembly 51 passes through the shielding cover 53b in a clearance fit manner and is fixedly connected with the impeller 40a in the centrifugal pump body 40, so that the requirement that the rotor assembly 51 drives the impeller 40a to rotate is met; the ratio of the dimension P of the gap between the shaft body 51a and the shield cover 53b is 1:1.1 to 1:1.2 (i.e., the ratio is within the range of 1:1.1 to 1:1.2 and has two endpoints), alternatively, as an example, the ratio of the dimensions of the gap P between the shaft 51a and the shield cover 53b is 1:1.1, 1:1.15 or 1:1.2; the shaft body 51a is internally provided with a backflow channel 511, an inlet 5111 of the backflow channel 511 is communicated with the sealing cavity 531, an outlet 5112 of the backflow channel 511 is communicated with a working cavity 40b in the centrifugal pump body 40, and the working cavity 40b is a cavity where an impeller 40a in the centrifugal pump body 40 is located; in the process of rotating the impeller 40a, the rotating impeller 40a throws the water body in the working cavity 40b to the periphery, so that negative pressure is formed in the center of the working cavity 40b, and thus, on one hand, water in the pump pipe 10 can be sucked from the water inlet 41 of the pump housing 40c to the center of the working cavity 40b, and on the other hand, the water body entering the sealing cavity 531 can be sucked to the center of the working cavity 40b through the backflow channel 511.

Furthermore, the motor housing 54 is sleeved on the shielding sleeve 53a and is fixedly connected with the shielding sleeve 53a in a sealing manner, so that the fixed connection part of the motor housing 54 and the shielding sleeve 53a is ensured to be sealed. The stator assembly 52 is fixedly located in a space 55 defined by the motor housing 54 together with the shield sleeve 53a to ensure reliability of operation of the stator assembly 52; alternatively, in fig. 2 and 3, as an example, the water inlet coupling seat 20 is respectively connected with the motor housing 54 and the shielding sleeve 53a in a sealing manner, so that the space 55 defined by the motor housing 54 and the shielding sleeve 53a forms a closed space, which seals the stator assembly 52 from the water body, effectively ensuring the reliability of the operation of the stator assembly 52, and facilitating the assembly of the stator assembly 52 in the space 55. More specifically, the following is:

as shown in fig. 1, the pump housing 40c and the shielding component 53 are axially constrained by the water inlet coupling seat 20 and the water outlet coupling seat 30 to prevent axial movement of the pump housing 40c and the shielding component 53; in addition, the pump housing 40c is also radially constrained by the water outlet coupling seat 30, and the shield assembly 53 is radially constrained by the water inlet coupling seat 20; thus, the pump housing 40 and the shielding assembly 53 are reliably secured at the pump tube 10; of course, the relationship between the pump housing 40c and the shield assembly 53, the water outlet connection seat 30 and the pump pipe 10 may be other according to practical needs, and similarly, the relationship between the shield assembly 53 and the water inlet connection seat and the pump pipe 10 may be other, so the invention is not limited to the one shown in fig. 2. In addition, as shown in fig. 2 and 3, a second gasket 70 is axially interposed between the shielding sleeve 53a and the water inlet connector 20 to realize the sealing connection between the shielding sleeve 53a and the water inlet connector 20 by means of the second gasket 70, however, the sealing connection between the shielding sleeve 53a and the water inlet connector 20 can be other, and is not limited to the one shown in fig. 2 and 3.

As shown in fig. 2 to 4 and 7, the rotor assembly 51 includes the shaft body 51a and the rotor core 51b. The shaft body 51a axially passes through the rotor core 51b from the center of the rotor core 51b and protrudes from the rotor core 51b such that the position where the shaft body 51a protrudes from the rotor core 51b forms a first protruding end 512 and a second protruding end 513, in a state shown in fig. 7; at this time, a first shaft sleeve 53c is provided at the center of the shielding cover 53b, and a second shaft sleeve 53d is provided in the sealing cavity 531 at the center of the shielding sleeve 53a away from the shielding cover 53 b; the first protruding end 512 is inserted into the first shaft sleeve 53c in a clearance fit manner and is fixedly connected with the impeller 40a, and the second protruding end 513 is inserted into the second shaft sleeve 53d in a clearance fit manner; by means of the cooperation of the first shaft sleeve 53c and the second shaft sleeve 53d with the shaft body 51a, the stability and smoothness of rotation of the shaft body 51a are improved, and the use of rolling bearings is avoided. Specifically, in fig. 2, 3, 4, 8 and 9, as an example, the submersible motor 50 further includes a first stop assembly 56 and a second stop assembly 57, the first stop assembly 56 includes a first rubber ring 561 tightly sleeved on the first protruding end 512 and a first stop ring 562 embedded in and fixed to the first rubber ring 561, the first stop ring 562 axially protrudes the first rubber ring 561 and surrounds the first protruding end 512, the first stop ring 562 also axially abuts against the first shaft sleeve 53c, and the first rubber ring 561 axially abuts against the rotor core 51b, so that the wear-resistant first stop ring 562 is fixed on the first protruding end 512 by means of the elastic force of the first rubber ring 561, thereby ensuring the reliability that the shaft body 51a drives the first stop assembly 56 to rotate synchronously relative to the first shaft sleeve 53 c; in addition, the second stop assembly 57 includes a second rubber ring 571 tightly sleeved on the second protruding end 513 and a second stop ring 572 embedded in and fixed to the second rubber ring 571, the second stop ring 572 axially protrudes the second rubber ring 571 and surrounds the second protruding end 513, the second stop ring 572 also axially abuts against the second shaft 53d, and the second rubber ring 571 axially abuts against the rotor core 51 b; the wear-resistant second stop ring 572 is fixed on the second protruding end 513 by the elastic force of the second rubber ring 571, so as to ensure the reliability of the synchronous rotation of the shaft body 51a driving the second stop component 57 relative to the second shaft sleeve 53d; therefore, axial play of the shaft body 51a is effectively prevented. More specifically, in fig. 8 and 9, as an example, three first notches 5621 are formed at the position of the first rubber ring 561 protruding axially from the first stop ring 562 and arranged at intervals along the circumferential direction of the first stop ring 562, and the first notches 5621 are arranged along the radial direction of the first stop ring 562 in an extending manner, so that the contact area between the first stop ring 562 and the first sleeve shaft 53c is effectively reduced by means of the first notches 5621 to reduce the friction heat productivity, and on the other hand, the water in the sealing cavity 531 flows along the first notches 5621 to timely take away the heat generated by rotation at the first shaft sleeve 53c, the first stop ring 562 and the first protruding end 512, thereby further improving the cooling and lubrication effects; in addition, the position of the second stop ring 572 protruding from the first rubber ring 571 in the axial direction is provided with three second notches 5721 arranged along the circumferential direction of the second stop ring 572 at intervals, and the second notches 5721 are arranged along the radial direction of the second stop ring 572 in an extending manner, so that the contact area between the second stop ring 572 and the second sleeve shaft 53d is effectively reduced by means of the second notches 5721 to reduce the friction heating value, and on the other hand, the water in the sealing cavity 531 flows along the second notches 5721 to timely take away the heat generated by rotation at the positions of the second sleeve 53d, the second stop ring 572 and the second protruding end 513, thereby improving the cooling and lubricating effects. For example, the shaft body 51a, the first shaft sleeve 53c, the second shaft sleeve 53d, the first stop ring 562 and the second stop ring 572 are made of ceramics, so as to increase durability and lifetime. It is understood that the number of the first notches 5621 and the second notches 5721 may be one, two or four, according to actual needs, and thus is not limited to those shown in fig. 8 and 9.

As shown in fig. 1 to 6, the shielding sleeve 53a is provided with an annular body 53e axially arched in a direction away from the second sleeve 53d at a position away from the shielding cover 53b, the opening of a space 532 surrounded by the annular body 53e is closed by the second sleeve 53d, the second protruding end 513 is exposed in the space 532 surrounded by the annular body 53e, and the inlet 5111 of the backflow channel 511 is communicated with the space 532 surrounded by the annular body 53e, so that the water in the sealing cavity 531 enters the space 532 surrounded by the annular body 53e from the gap between the second protruding end 513 and the second sleeve 53d, and then flows back into the centrifugal pump body 40 along the backflow channel 511, thereby effectively cooling and lubricating the positions of the second protruding end 513 and the second sleeve 53 d. Specifically, in fig. 1 to 6, as an example, the annular body 53e is bowl-shaped (i.e. a rotating body), so as to facilitate the processing and manufacturing of the annular body 53e at the shielding sleeve 53 a. For example, the shielding sleeve 53a is an integral structure formed by stamping and stretching, so as to simplify the manufacturing process of the shielding sleeve 53 a. When the shielding sleeve 53a is formed as a single piece by press-drawing, the second sleeve 53d may be fixed to the shielding sleeve 53a by welding or the like.

As shown in fig. 1, the water inlet 41 in the centrifugal pump body 40 faces the inner side wall 11 of the pump pipe 10 so that the water body entering the pump pipe 10 from the water inlet coupling seat 20 enters the working chamber 40b from the side of the pump housing 40c of the centrifugal pump body 40; in addition, the water outlet 42 in the centrifugal pump body 40 is connected to the water outlet connection seat 30, so as to ensure that the water body conveyed by the water outlet 42 is conveyed to the outside along the water outlet connection seat 30.

As shown in fig. 2 to 4 and 7, the return passage 511 is a straight passage penetrating the shaft 51a in the axial direction of the shaft 51a, so as to facilitate the manufacture of the return passage 511 in the shaft 51 a. Specifically, in fig. 2 to 4 and 7, as an example, the return passage 511 is located at the center of the shaft body 51a to ensure structural strength of the shaft body 51 a; in addition, the outer contour of the backflow channel 511 is circular, which is more convenient for manufacturing and processing the backflow channel 511 on the shaft body 51a, and of course, the outer contour of the backflow channel 511 can be in other shapes according to actual needs; in addition, the inlet 5111 of the return channel 511 is located at the end face 5131 of the second protruding end 513, and the outlet 5112 of the return channel 511 is located at the end face 5121 of the first protruding end 512, so that the outlet 5112 of the return channel 511 is adjacent to the water outlet 42 of the centrifugal pump body 40, thereby more effectively increasing the suction effect of the return channel 511 on the sealed cavity 531.

Compared with the prior art, since the micro-filtration holes 533 which are communicated with the sealing cavity 531 and have the aperture of 0.2 to 0.4 mm are formed in the shielding cover 53b, the ratio of the aperture of the micro-filtration holes 533 to the size of the gap P between the shaft body 51a and the shielding cover 53b is 1:1.1 to 1:1.2, a reflux channel 511 is arranged in the shaft body 51a, an inlet 5111 of the reflux channel 511 is communicated with the sealing cavity 531, and an outlet 5112 of the reflux channel 511 is communicated with a working cavity 40b where an impeller 40a in the centrifugal pump body 40 is positioned; the design makes the mute pipeline permanent magnet centrifugal pump 100 of the invention filter the water body entering the seal cavity 531 for cooling and lubricating the shaft body 51a so as to prevent tiny impurities such as sand and stone in the water body from entering the seal cavity 531; on the other hand, the mute pipeline permanent magnet centrifugal pump 100 of the invention can realize that the water body entering the pump pipe 10 from the water inlet connecting seat 20 flows into the sealing cavity 531 from the micro-filtration hole 533 quickly in a suction mode, and then is conveyed into the working cavity 40b where the impeller 40a of the centrifugal pump body 40 is positioned along the backflow channel 511, and finally is sent out from the water outlet connecting seat 30, thereby improving the cooling effect; meanwhile, the ratio of the aperture through the micro-filtration pore 533 to the gap P size between the shaft body 51a and the shielding cover 53b is 1:1.1 to 1:1.2, which is effective for controlling the water in the pump tube 10 to flow mainly from the micro-filtration pores 533 into the sealed cavity 531; in addition, since the submersible motor 50 in the mute pipeline permanent magnet centrifugal pump 100 of the invention is positioned in the pump pipe 10, the generated vibration is absorbed and carried away by the water in the pump pipe 10, thereby achieving the purpose of mute.

It is to be noted that, the tight fitting of the first rubber ring 561 on the first protruding end 512 means that the first rubber ring 561 is in interference fit with the first protruding end 512, and similarly, the tight fitting of the second rubber ring 571 on the second protruding end 513 means that the second rubber ring 571 is in interference fit with the second protruding end 513; in addition, the first rubber ring 561 and the first stop ring 562 can be fixed together by a tight fit (i.e. interference mode), and the second rubber ring 571 and the second stop ring 572 can also be fixed together by a tight fit, but not limited thereto. In addition, the water inlet connecting seat 20 is in butt joint with an external water inlet pipe, and the water outlet connecting seat 30 is in butt joint with an external water outlet pipe. Finally, rotor core 51b is preferably a permanent magnet core.

The foregoing disclosure is only illustrative of the preferred embodiments of the present invention and is not to be construed as limiting the scope of the invention, which is defined by the appended claims.

Claims (10)

1. The utility model provides a silence pipeline permanent magnetism centrifugal pump, includes the pump line, is fixed in the water connecting seat of pump line one end, be fixed in the play water connecting seat of pump line other end, be located in the pump line and with play water connecting seat adjacent centrifugal pump body and be located in the pump line and go into the adjacent submersible motor of water connecting seat, submersible motor contains rotor subassembly, stator subassembly, shielding subassembly and motor housing, its characterized in that, the shielding subassembly contains shielding sleeve and shielding lid, the inner space of shielding sleeve forms the cavity towards the sealed chamber of centrifugal pump body, the shielding lid is located between shielding sleeve and the centrifugal pump body, the shielding lid still with the shielding sleeve seal is fixed in order to seal the cavity, rotor subassembly is located in the sealed chamber, the axis body in the rotor subassembly is clearance fit ground and passes the shielding lid and with impeller fixed connection in the centrifugal pump body, the motor housing in the shielding sleeve and with the fixed connection that the shielding sleeve is sealed, the motor housing is fixed in the shielding housing is located by the shielding housing the aperture is with the clearance between the clearance cover is equipped with the clearance between the clearance cover is 1 with the clearance between the clearance cover and the clearance is 1, and the clearance is 0 mm with the clearance is than the clearance cover is opened to the clearance between the micro-filtration pore 2.0 and the clearance cover and is sealed to the size between the clearance cover and the aperture of the 1.0 and the clearance. 1.1 to 1:1.2, a backflow channel is arranged in the shaft body, an inlet of the backflow channel is communicated with the sealing cavity, and an outlet of the backflow channel is communicated with a working cavity where an impeller in the centrifugal pump body is located.

2. The silent pipe permanent pump centrifugal pump according to claim 1, wherein said rotor assembly comprises said shaft body and a rotor core, said shaft body axially passing through and protruding from a center of said rotor core to form a first protruding end and a second protruding end, a first sleeve is provided at a center of said shield cover, a second sleeve is provided at a center of said shield cover away from said shield cover, said first protruding end is inserted in said first sleeve in a clearance fit and fixedly connected to said impeller, and said second protruding end is inserted in said second sleeve in a clearance fit.

3. The silent pipe permanent pump centrifugal pump of claim 2, wherein said submersible motor further comprises a first stop assembly and a second stop assembly, said first stop assembly comprising a first rubber ring that is tightly sleeved on said first protruding end and a first stop ring that is embedded in and fixed to said first rubber ring, said first stop ring axially protruding said first rubber ring and surrounding said first protruding end, said first stop ring also axially abutting said first sleeve, said first rubber ring axially abutting said rotor core; the second stop assembly comprises a second rubber ring tightly sleeved on the second protruding end and a second stop ring embedded in and fixed to the second rubber ring, the second stop ring protrudes axially out of the second rubber ring and surrounds the second protruding end, the second stop ring also axially resists the second sleeve, and the second rubber ring axially resists the rotor magnetic core.

4. The silent pipe permanent magnet centrifugal pump according to claim 3, wherein a plurality of first notches are formed in the position, protruding from the first rubber ring, of the first stop ring in the axial direction, the first notches are arranged in a spaced manner along the circumferential direction of the first stop ring, the first notches are arranged in a radial extension manner of the first stop ring, a plurality of second notches are formed in the position, protruding from the first rubber ring, of the second stop ring in the axial direction, the second notches are arranged in a spaced manner along the circumferential direction of the second stop ring, and the second notches are arranged in a radial extension manner of the second stop ring.

5. The silent pipe permanent magnet centrifugal pump according to claim 2, wherein said shielding sleeve has an annular body axially arched away from said second sleeve at a position away from said shielding cover, an opening of a space surrounded by said annular body is closed by said second sleeve, said second protruding end is exposed in the space surrounded by said annular body, and an inlet of said return passage communicates with the space surrounded by said annular body.

6. The silent pipe permanent magnet centrifugal pump according to claim 5, wherein said ring body is bowl-shaped.

7. The silent pipe permanent magnet centrifugal pump according to claim 2, wherein said return channel is a straight channel penetrating said shaft body in an axial direction of said shaft body, said return channel being located at a center of said shaft body, an outer contour of said return channel being circular.

8. The silent pipe permanent magnet centrifugal pump according to claim 2, wherein the inlet of said return channel is located at the end face of said second male end and the outlet of said return channel is located at the end face of said first male end.

9. The silent pipe permanent magnet centrifugal pump according to claim 3, wherein the shaft body, the first shaft sleeve, the second shaft sleeve, the first stop ring and the second stop ring are each made of ceramic.

10. The mute pipeline permanent magnet centrifugal pump according to claim 1, wherein the shielding sleeve is of an integrated structure formed by stamping and stretching, the centrifugal pump body is a multistage centrifugal pump body, a water inlet in the centrifugal pump body faces the inner side wall of the pump pipe, a water outlet in the centrifugal pump body is connected to the water outlet connecting seat, an outlet of the backflow channel is adjacent to the water outlet of the centrifugal pump body, and the water inlet connecting seat is respectively connected with the motor shell and the shielding sleeve in a sealing manner, so that a space defined by the motor shell and the shielding sleeve together forms a closed space.