Shield pump structure

Abstract

The shield pump structure comprises a motor part and a pump part, the pump part is located at the front end of the motor part, the motor part comprises a rotating shaft and a rotor arranged on the rotating shaft, the two end sides of the rotating shaft are provided with a first flow channel and a second flow channel correspondingly, and the rotating shaft is provided with a solid section located between the first flow channel and the second flow channel; the circumferential surface, matched with the rotating shaft, of the rotor is sunken to form a third flow channel, and the third flow channel extends in the axial direction of the rotating shaft and extends from one end of the rotor to the other end of the rotor.

Description

Technical Field

[0001] The invention belongs to the technical field of pump structures, and in particular relates to a shielded pump structure. Background Art

[0002] The canned pump is also called a sealed pump, which can be regarded as a structure that connects the motor and the pump into one. A liquid flow path is usually provided inside the canned pump, and the liquid medium circulates in the above liquid flow path to remove the excess heat inside the canned pump, so as to avoid the problem of excessive heat inside the canned pump. In the prior art, in order to form a liquid flow path, a through hole is usually provided on the rotating shaft that penetrates it axially, and the rotating shaft bears the weight of the rotor, impeller and bearing assembly. The axial through hole on the rotating shaft weakens the structural strength of the rotating shaft and affects the bearing effect of the rotating shaft. Therefore, it is necessary to improve the prior art to overcome the above defects in the prior art. Summary of the invention

[0003] Therefore, the technical problem to be solved by the present invention is to provide a shielded pump structure that can ensure the structural strength of the shaft.

[0004] In order to solve the above technical problems, the present invention provides a shielded pump structure, comprising: a motor housing; a stator, arranged on the circumferential inner wall of the motor housing; a rotating shaft, arranged in the motor housing and extending from the first end of the motor housing to the outside of the motor housing; a rotor, arranged on the rotating shaft, the rotor is located in the motor housing and on the inner side of the stator, and the rotor cooperates with the stator; an isolating sleeve, located in the motor housing and sleeved on the outer circumference of the rotor, one end of the isolating sleeve is open; a pump housing, arranged at the first end of the motor housing and abutting against the open end of the isolating sleeve, the pump housing having a pump inlet and a pump outlet; an impeller, arranged on the rotating shaft and accommodated in a pump cavity of the pump housing, the rotating shaft extending into the pump cavity; The pump housing includes a middle bearing abutting against the open end of the isolation sleeve, the impeller is located on a side of the middle bearing away from the isolation sleeve, the middle bearing is provided with an axial through-hole penetrating along the axial direction of the rotating shaft, the axial through-hole communicates with the isolation sleeve and the pump chamber, and the middle bearing is also provided with a liquid inlet channel for allowing the liquid in the pump chamber to enter the isolation sleeve; The rotating shaft is provided with a guide sleeve located between the impeller and the rotor, the guide sleeve is located in the shaft through hole and abuts against the rotor, and there is a clearance fit between the guide sleeve and the shaft through hole; The two end sides of the rotating shaft are respectively provided with a first flow channel and a second flow channel, the rotating shaft has a solid section located between the first flow channel and the second flow channel, the first flow channel is located at the end side of the rotating shaft away from the impeller, and the second flow channel is located at the end side of the rotating shaft close to the impeller; A third flow channel is formed on the circumferential surface of the rotor that cooperates with the rotating shaft. The third flow channel extends along the axial direction of the rotating shaft and extends from one end of the rotor to the other end. The first flow channel connects the isolation sleeve and the third flow channel, so that the liquid in the isolation sleeve enters the third flow channel through the first flow channel; a fourth flow channel connected to the third flow channel is provided in the guide sleeve; the second flow channel connects the fourth flow channel and the pump chamber, so that the liquid in the fourth flow channel enters the pump chamber through the second flow channel.

[0005] Preferably, the axial length of the solid section is L1, the axial length of the first flow channel is L3, and the axial length of the second flow channel is L2, wherein L1>L2+L3.

[0006] Preferably, the first flow channel is formed with a first liquid inlet port on the end of the rotating shaft away from the impeller, and at least one first liquid outlet port is formed on the circumferential wall of the rotating shaft; The second flow channel is formed with a second liquid inlet port on the end of the rotating shaft close to the impeller, and at least one second liquid outlet port is formed on the circumferential wall of the rotating shaft; The first liquid outlet port is located in the third flow channel, the second liquid outlet port is located in the fourth flow channel, and the axial distance between the first liquid outlet port and the second liquid outlet port is the axial length L1 of the solid segment.

[0007] Preferably, an elastic member is disposed between the impeller and the guide sleeve, and the elastic member is configured to limit the freedom of translation of the impeller toward the guide sleeve; A first transition ring is fixed on the rotating shaft, and the first transition ring is located on the side of the impeller away from the elastic member. The impeller is provided with a first positioning pin that abuts against the first transition ring, and the first positioning pin is configured to limit the freedom of the impeller to translate toward the first transition ring.

[0008] Preferably, a spiral groove is provided on the outer peripheral wall of the guide sleeve, and the spiral groove is configured to accelerate the liquid in the shaft through-hole to flow toward the isolation sleeve.

[0009] Preferably, a rotary cutting notch is provided at the end of the guide sleeve close to the rotor, and the rotary cutting notch makes the outer diameter of the end of the guide sleeve close to the rotor smaller than the outer diameter of the outer peripheral wall of the guide sleeve provided with the spiral groove, wherein the rotary cutting notch is located on the outside of the shaft through hole, and the spiral groove is located inside the shaft through hole.

[0010] Preferably, the guide sleeve is hollow inside and has one end open and the other end closed. The end of the guide sleeve close to the impeller is a closed end, and the other end away from the impeller is an open end. The closed end of the guide sleeve is provided with a first through hole for the rotating shaft to pass through. Wherein, a partition plate parallel to the closed end is provided in the hollow cavity of the guide sleeve, a second through hole opposite to the first through hole for the shaft to pass through is provided on the partition plate, and a plurality of third through holes are also provided on the partition plate, and the plurality of third through holes are evenly spaced and distributed on the periphery of the second through hole in the circumferential direction; The partition is distributed close to the opening end of the guide sleeve and has a first spacing between the partition and the opening end of the guide sleeve, and the concave space formed by the first spacing is configured to gather the liquid flowing out through the third flow channel; The space between the partition plate and the closed end of the guide sleeve is the inner cavity of the guide sleeve, and the inner cavity, the third through hole and the recessed space constitute the fourth flow channel.

[0011] Preferably, the liquid inlet channel comprises a first liquid inlet channel and a second liquid inlet channel, the first liquid inlet channel is distributed parallel to the axial direction of the rotating shaft, and the liquid inlet of the first liquid inlet channel is distributed close to the pump outlet; The second liquid inlet channel is inclined and is distributed at an acute angle with the central axis of the rotating shaft. The liquid inlet of the second liquid inlet channel is distributed close to the pump inlet, and the liquid outlet of the second liquid inlet channel is located on the hole wall of the shaft perforation.

[0012] Preferably, the center bearing comprises a disc-shaped body abutting against the open end of the isolation sleeve, a frustum coaxially arranged with the disc-shaped body and located in the isolation sleeve, and the shaft through-hole axially penetrates the disc-shaped body and the frustum; The shaft through hole is a stepped hole, including a first hole portion formed on the disc-shaped body and a second hole portion formed on the frustum, wherein the diameter of the first hole portion is greater than the diameter of the second hole portion; The liquid outlet of the second liquid inlet channel is located on the hole wall of the first hole portion, the guide sleeve is at least partially located in the second hole portion, and there is a clearance fit between the guide sleeve and the second hole portion.

[0013] Preferably, the pump housing comprises the center bearing and a pump cover connected to the first end of the motor housing, and the center bearing and the isolation sleeve are sealed and sandwiched between the motor housing and the pump cover.

[0014] The technical solution provided by the present invention has the following advantages: In this embodiment, a first flow channel and a second flow channel are respectively provided on both end sides of the rotating shaft, the rotating shaft has a solid section located between the first flow channel and the second flow channel, and a third flow channel is provided on the circumferential surface where the rotor and the rotating shaft cooperate. Thus, it is possible to avoid providing an axial through hole on the entire rotating shaft, effectively improving the structural strength of the rotating shaft, so that the rotating shaft has a better load-bearing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 A schematic diagram of the three-dimensional structure of the canned motor pump structure provided by the present invention; Figure 2 A schematic cross-sectional view of the canned motor pump structure provided by the present invention; Figure 3 for Figure 2 Schematic diagram of the enlarged structure of the A area in the middle; Figure 4 An exploded schematic diagram of a part of the structure of the canned motor pump provided by the present invention; Figure 5 This is a schematic diagram of the structure of the middle bearing from the first perspective; Figure 6 This is a schematic diagram of the structure of the middle bearing at the second viewing angle; Figure 7 This is a schematic diagram of the structure of the middle bearing from the third perspective; Figure 8 It is a schematic diagram of the cross-sectional structure of the center bearing; Fig. 9 It is a schematic diagram of the three-dimensional structure of the pump cover; Fig.10 is a schematic diagram of the structure of the front end cover; Fig.11 It is a schematic diagram of the cross-sectional structure of the isolation sleeve; Fig.12 is a schematic diagram of the rear end cover in a first direction; Fig.13 is a schematic diagram of the rear end cover in the second direction; Fig.14 Schematic diagram of the three-dimensional structure of the guide sleeve; Fig.15 Schematic diagram of the cross-sectional structure of the guide sleeve; Fig.16 is a schematic diagram of the three-dimensional structure of the rotating shaft; Fig.17 is a schematic diagram of the cross-sectional structure of the rotating shaft; Fig.18 is a schematic diagram of the structure of the rotor; Fig.19 It is a schematic diagram of the structure of the impeller. DETAILED DESCRIPTION

[0017] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0018] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0019] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0020] The present invention provides a shielded pump structure, which comprises: a motor part and a pump part, wherein the pump part is located at the front end of the motor part and the motor part is located at the rear end of the pump part. Figures 1 to 4 As shown, the motor part includes a motor housing 130, a stator 120, a rotor 110, a rotating shaft 100 and a spacer sleeve 140; the pump part includes a pump housing 200, an impeller 300 and a guide sleeve 400, and the impeller 300 and the guide sleeve 400 are accommodated in the pump housing 200. It is worth noting that the axial direction and the circumferential direction appearing below are based on the rotating shaft 100 as a reference item, that is, the axial direction refers to the axial direction of the rotating shaft 100, and the circumferential direction refers to the circumferential direction of the rotating shaft 100.

[0021] The stator 120 is disposed on the circumferential inner wall of the motor housing 130. The rotating shaft 100 is disposed in the motor housing 130 and extends from the first end of the motor housing 130 to the outside of the motor housing 130, wherein the above-mentioned "first end" is the front end of the motor housing 130. The rotor 110 is disposed on the rotating shaft 100, and the rotor 110 is located in the motor housing 130 and on the inner side of the stator 120, and the rotor 110 cooperates with the stator 120. The isolation sleeve 140 is located in the motor housing 130 and is sleeved on the outer circumference of the rotor 110, wherein one end of the isolation sleeve 140 close to the first end of the motor housing 130 is open.

[0022] The pump housing 200 is disposed at the first end of the motor housing 130 and abuts against the open end of the isolation sleeve 140. The pump housing 200 has a pump cavity, a pump inlet 230 and a pump outlet 240, and the pump inlet 230 and the pump outlet 240 are respectively connected to the pump cavity. The impeller 300 is disposed on the rotating shaft 100 and accommodated in the pump cavity, wherein the portion of the rotating shaft 100 located outside the motor housing 130 extends into the pump cavity, thereby the impeller 300 can be disposed on the rotating shaft 100.

[0023] The pump housing 200 includes a center bearing 220 abutting against the open end of the isolation sleeve 140 and a pump cover 210 connected to the first end of the motor housing 130. The center bearing 220 and the isolation sleeve 140 are sealed and clamped between the motor housing 130 and the pump cover 210. The impeller 300 is located on the side of the center bearing 220 away from the isolation sleeve 140.

[0024] like Figures 5 to 8 As shown, the middle bearing 220 is provided with an axial through hole 221 which penetrates the axial direction of the rotating shaft 100, and the axial through hole 221 connects the isolation sleeve 140 and the pump chamber. The middle bearing 220 is also provided with a liquid inlet channel 150 which allows the liquid in the pump chamber to enter the isolation sleeve 140, thereby, the liquid in the pump chamber can enter the isolation sleeve 140.

[0025] Furthermore, if Figure 2 As shown, the rotating shaft 100 is provided with a guide sleeve 400 located between the impeller 300 and the rotor 110 . The guide sleeve 400 is located in the shaft through hole 221 and abuts against the rotor 110 . When the rotor 110 drives the rotating shaft 100 to rotate, the guide sleeve 400 rotates together with the rotating shaft 100 .

[0026] Specifically, Fig.14 and Fig.15 As shown, the guide sleeve 400 is hollow inside and has an open rear end and a closed front end, that is, the end of the guide sleeve 400 close to the impeller 300 is a closed end, and the other end away from the impeller 300 is an open end. The closed end of the guide sleeve 400 is provided with a first through hole 440 for the rotating shaft 100 to pass through.

[0027] A partition 450 parallel to the closed end is provided in the hollow cavity of the guide sleeve 400, and a second through hole 451 opposite to the first through hole 440 is provided on the partition 450 for the rotating shaft 100 to pass through. A plurality of third through holes 452 are also provided on the partition 450, and the plurality of third through holes 452 are evenly spaced and distributed on the periphery of the second through hole 451 in the circumferential direction.

[0028] The partition 450 is disposed near the open end of the guide sleeve 400 and has a first spacing H between the partition 450 and the open end of the guide sleeve 400 . The first spacing H forms a recessed space 470 . The space between the partition 450 and the closed end of the guide sleeve 400 is an inner cavity 460 of the guide sleeve 400 .

[0029] There is a clearance fit between the guide sleeve 400 and the shaft through hole 221. When the guide sleeve 400 rotates, there is no friction interference between the guide sleeve 400 and the hole wall of the shaft through hole 221. In addition, due to the clearance fit, there is space for liquid to flow between the outer peripheral wall of the guide sleeve 400 and the hole wall of the shaft through hole 221.

[0030] Furthermore, a spiral groove 420 is provided on the outer peripheral wall of the guide sleeve 400, and the spiral groove 420 is used to accelerate the liquid in the shaft through hole 221 to flow into the isolation sleeve 140. When the guide sleeve 400 rotates together with the rotating shaft 100, the flow speed of the liquid in the shaft through hole 221 can be further accelerated, which is more conducive to the liquid in the pump cavity entering the isolation sleeve 140.

[0031] A rotating cutting notch 430 is provided at the end of the guide sleeve 400 close to the rotor 110, and the rotating cutting notch 430 makes the outer diameter of the end of the guide sleeve 400 close to the rotor 110 smaller than the outer diameter of the outer peripheral wall of the guide sleeve 400 provided with the spiral groove 420, wherein the rotating cutting notch 430 is located on the outside of the shaft through hole 221, and the spiral groove 420 is located inside the shaft through hole 221.

[0032] Since the guide sleeve 400 is in contact with the rotor 110, after the rotary cutting notch 430 is provided, the space at the rear end of the spiral groove 420 can be increased, which is beneficial for the liquid to be discharged from the shaft perforation 221 after being pressurized by the spiral groove 420 and enter the isolation sleeve 140, thereby reducing the discharge resistance.

[0033] like Figure 2 , Figure 3 , Figure 5 and Figure 6 As shown, the liquid inlet channel 150 includes a first liquid inlet channel 151 and a second liquid inlet channel 152. The first liquid inlet channel 151 is parallel to the axial direction of the rotating shaft 100, and the liquid inlet of the first liquid inlet channel 151 is close to the pump outlet 240. The pressure of the pump outlet 240 is relatively high. Under the action of the relatively high pressure, the liquid in the pump cavity can quickly pass through the first liquid inlet channel 151 and enter the isolation sleeve 140.

[0034] The second liquid inlet channel 152 is arranged obliquely and is distributed at an acute angle with the central axis of the rotating shaft 100. The liquid inlet of the second liquid inlet channel 152 is distributed close to the pump inlet 230, and the liquid outlet M of the second liquid inlet channel 152 is located on the hole wall of the shaft through hole 221. Since the second liquid inlet channel 152 is arranged obliquely, the liquid inlet of the second liquid inlet channel 152 is located obliquely above the liquid outlet M of the second liquid inlet channel 152, which is conducive to the liquid entering the shaft through hole 221 from the pump cavity, and being quickly pumped into the isolation sleeve 140 under the action of the spiral groove 420 on the outer periphery of the guide sleeve 400.

[0035] In this embodiment, by setting up two liquid inlet channels, the speed at which the liquid in the pump chamber enters the isolation sleeve 140 can be effectively accelerated, and the liquid inlet efficiency is high, thereby avoiding the situation where the amount of liquid in the isolation sleeve 140 does not reach the preset liquid amount after the above-mentioned motor part has worked for a period of time, resulting in poor heat dissipation effect.

[0036] In this embodiment, the pump cover 210 is fixed to the first end of the motor housing 130 by a first fastener (not shown), and the first fastener is a bolt. After the pump cover 210 is connected to the motor housing 130, the positions of the center support 220 and the isolation sleeve 140 are fixed, and no additional installation structure is required, which simplifies the structure of the isolation sleeve 140 and greatly simplifies the installation process.

[0037] like Figure 2 and Fig. 9 As shown, the inner wall of the pump cover 210 is recessed along the axial direction to form a front bearing chamber 211, and the front bearing 104 is arranged in the front bearing chamber 211. The front bearing 104 is sleeved on the rotating shaft 100, and the front bearing 104 supports the rotating shaft 100 from the front end. The inner ring of the front bearing 104 is recessed to form a front liquid passage 105 extending along the axial direction.

[0038] like Figure 7 and Figure 8 As shown, the center bearing 220 includes a disc-shaped body 222 abutting against the open portion of the isolation sleeve 140, a frustum 223 coaxially arranged with the disc-shaped body 222 and located in the isolation sleeve 140, and an axial through hole 221 axially penetrates the disc-shaped body 222 and the frustum 223.

[0039] In this embodiment, there is a receiving space in the axial direction between the front end of the rotor 110 and the rear end surface of the disc-shaped body 222, and the above-mentioned cone 223 is received in the receiving space. The ratio of the axial length of the receiving space to the axial length of the disc-shaped body 222 is 2.6. Thus, it is ensured that the front end of the isolation sleeve 140 has enough space to store liquid.

[0040] like Figure 8 As shown, the shaft through hole 221 is a stepped hole, including a first hole portion 2211 formed on the disc-shaped body 222 and a second hole portion 2212 formed on the cone 223 , wherein the diameter of the first hole portion 2211 is greater than the diameter of the second hole portion 2212 .

[0041] It is worth noting that Figure 2 , Figure 3 and Figure 8As shown, the liquid outlet M of the second liquid inlet channel 152 is located on the hole wall of the first hole portion 2211, and the guide sleeve 400 is at least partially located in the second hole portion 2212, and there is a clearance fit between the guide sleeve 400 and the second hole portion 2212. Preferably, the portion of the guide sleeve 400 provided with the spiral groove 420 is located in the second hole portion 2212, and the rotary cutting notch 430 is located outside the second hole portion 2212.

[0042] The motor housing 130 includes a main housing 133, a front cover 131 disposed at the front end of the main housing 133, and a rear cover 132 disposed at the rear end of the main housing 133. The main housing 133 is hollow inside with openings at both ends. The stator 120 and the rotor 110 are located in the main housing 133.

[0043] The main shell 133, the front end cover 131 and the rear end cover 132 are connected by a second fastener (not shown); in one case, the second fastener is a long bolt, which passes through the rear end cover 132, the main shell 133 and the front end cover 131 from back to front in sequence to connect the rear end cover 132, the main shell 133 and the front end cover 131 as a whole, and the number of the long bolts can be two or three, which are evenly spaced in the circumferential direction; in another case, the second fastener is an ordinary bolt (longer bolt and shorter bolt), the front end cover 131 and the main shell 133 are connected by the second fastener, and the rear end cover 132 and the main shell 133 are also connected by the second fastener.

[0044] like Fig.10 and Fig.11 As shown, the front end cover 131 is annular, and the front end surface of the front end cover 131 is recessed to form a limited groove shoulder 1311. The front end of the isolation sleeve 140 is provided with a front flange 141 that abuts and cooperates with the limited groove shoulder 1311, and the rear end of the isolation sleeve 140 is provided with a rear flange 142 that abuts and cooperates with the rear end cover 132. The rear end of the disc-shaped body 222 of the middle bearing 220 is also located in the above-mentioned limited groove shoulder 1311. Therefore, when the pump cover 210 is connected to the front end cover 131, the positions of the middle bearing 220 and the isolation sleeve 140 are also fixed. When disassembling, only the first fastener needs to be operated, which has the advantage of convenient disassembly and assembly.

[0045] In this embodiment, the isolation sleeve 140 is made by stretching or rolling plate welding with flanges at both ends. Specifically, the isolation sleeve 140 includes a cylindrical middle portion 143, the front flange 141 located at the front end of the middle portion 143, and the rear flange 142 located at the rear end of the middle portion 143. The front flange 141, the middle portion 143 and the rear flange 142 are fixedly connected to form a whole, wherein the rear flange 142 is provided with a fourth through hole 1421.

[0046] like Fig.12 and Fig.13As shown, a first boss 1321 is provided on the front end surface of the rear end cover 132, a second boss 1322 is provided on the front end surface of the first boss 1321, a rear bearing chamber 1323 is formed on the front end surface of the second boss 1322, a rear bearing 103 is provided in the rear bearing chamber 1323, and the rear bearing 103 is sleeved on the rotating shaft 100 for supporting the rotating shaft 100 from the rear end. Figure 2 As shown, a rear fluid passage 106 extending in the axial direction is formed in a recess on the inner ring of the rear bearing 103 .

[0047] The outer diameter of the first boss 1321 is greater than the outer diameter of the second boss 1322 to form a step structure. The first boss 1321 abuts against the rear end of the isolation sleeve 140 , and the second boss 1322 is inserted into the fourth through hole 1421 of the rear flange 142 .

[0048] A sealing structure is provided between the rear end cover 132 and the isolation sleeve 140 to prevent leakage of the liquid in the isolation sleeve 140. The rear end cover 132 is also provided with a leakage detection channel 1324, which penetrates the rear end cover 132 axially and is located at the periphery of the rear bearing chamber 1323.

[0049] In order to allow the liquid to circulate between the motor part and the pump part, a flow channel for the liquid to flow is provided on the rotating shaft 100, specifically, as shown in FIG. Fig.16 and Fig.17 As shown, the first flow channel 101 and the second flow channel 102 are respectively provided at both ends of the rotating shaft 100. The first flow channel 101 is located at the rear end side of the rotating shaft 100 away from the impeller 300, and the second flow channel 102 is located at the front end side of the rotating shaft 100 close to the impeller 300.

[0050] like Fig.18 As shown, a third flow channel 111 is formed on the circumferential surface of the rotor 110 and the shaft 100 , and the third flow channel 111 extends along the axial direction of the shaft 100 and extends from one end (front end) of the rotor 110 to the other end (rear end).

[0051] like Figure 2 and Figure 3 As shown, the first flow channel 101 is connected to the isolation sleeve 140 and the third flow channel 111, so that the liquid in the isolation sleeve 140 enters the third flow channel 111 through the first flow channel 101. Specifically, the first flow channel 101 is connected to the rear bearing chamber 1323, and the rear bearing chamber 1323 is connected to the isolation sleeve 140 through the rear liquid passage 106, so that the liquid in the isolation sleeve 140 enters the rear bearing chamber 1323 through the rear liquid passage 106, and the liquid in the rear bearing chamber 1323 enters the third flow channel 111 through the first flow channel 101.

[0052] The guide sleeve 400 is further provided with a fourth flow channel 410 connected to the third flow channel 111, wherein the inner cavity 460, the third through hole 452 and the recessed space 470 constitute the fourth flow channel 410. The recessed space 470 is used to gather the liquid flowing out through the third flow channel 111, and the liquid in the recessed space 470 enters the inner cavity 460 through the plurality of third through holes 452.

[0053] The second flow channel 102 communicates with the fourth flow channel 410 and the pump chamber, so that the liquid in the fourth flow channel 410 enters the pump chamber through the second flow channel 102. Specifically, the inner cavity 460 of the fourth flow channel 410 communicates with the second flow channel 102, the second flow channel 102 communicates with the front bearing chamber 211, and the front bearing chamber 211 communicates with the pump chamber through the front liquid passage 105.

[0054] In this embodiment, if Fig.17 As shown, the rotating shaft 100 has a solid section located between the first flow channel 101 and the second flow channel 102, wherein the axial length of the solid section is L1, the axial length of the first flow channel 101 is L3, and the axial length of the second flow channel 102 is L2, wherein L1>L2+L3. Thus, the rotating shaft 100 is ensured to have sufficient structural strength and good bearing effect.

[0055] The first flow channel 101 is formed with a first liquid inlet port 1011 on the end of the rotating shaft 100 away from the impeller 300, and at least one first liquid outlet port 1012 is formed on the circumferential wall of the rotating shaft 100. The second flow channel 102 is formed with a second liquid inlet port 1021 on the end of the rotating shaft 100 close to the impeller 300, and at least one second liquid outlet port 1022 is formed on the circumferential wall of the rotating shaft 100.

[0056] The first liquid outlet port 1012 is located in the third flow channel 111, the second liquid outlet port 1022 is located in the fourth flow channel 410, and the axial distance between the first liquid outlet port 1012 and the second liquid outlet port 1022 is the axial length L1 of the solid section. The first liquid outlet port 1012 is distributed close to the rear end of the rotor 110, so that most of the rotor 110 is located on the solid section, which better supports the rotor 110.

[0057] like Figure 2As shown, an elastic member 500 is disposed between the impeller 300 and the guide sleeve 400. The elastic member 500 may be a spring, a silicone pad, etc. The elastic member 500 is used to limit the freedom of the impeller 300 to translate toward the guide sleeve 400. A first transition ring 510 is fixed on the rotating shaft 100. The first transition ring 510 is located on the side of the impeller 300 away from the elastic member 500. The impeller 300 is provided with a first positioning pin 520 that is abutted against the first transition ring 510. The first positioning pin 520 is used to limit the freedom of the impeller 300 to translate toward the first transition ring 510. As a result, the position of the impeller 300 in the pump chamber is fixed to avoid friction between the impeller 300 and the wall of the pump chamber.

[0058] like Fig.19 As shown, the impeller 300 is provided with a through hole 310 that penetrates the impeller 300 in the axial direction, and the through hole 310 can make the spaces on both sides of the impeller 300 communicate. The impeller 300 is also provided with a pin hole 320 for inserting the first positioning pin 520.

[0059] Obviously, the embodiments described above are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, ordinary technicians in this field can make other different forms of changes or modifications without creative work, which should fall within the scope of protection of the present invention.

Claims

1. A canned motor pump structure, characterized in that: include: Motor housing (130); A stator (120) is arranged on the circumferential inner wall of the motor housing (130); A rotating shaft (100) is disposed in the motor housing (130) and extends from a first end of the motor housing (130) to an outer side of the motor housing (130); A rotor (110) is disposed on the rotating shaft (100); the rotor (110) is located inside the motor housing (130) and inside the stator (120); the rotor (110) cooperates with the stator (120); An isolation sleeve (140) is located in the motor housing (130) and sleeved on the outer circumference of the rotor (110); one end of the isolation sleeve (140) is open; A pump housing (200) is disposed at a first end of the motor housing (130) and abuts against an open end of the isolation sleeve (140); the pump housing (200) has a pump inlet (230) and a pump outlet (240); an impeller (300) disposed on the rotating shaft (100) and accommodated in a pump cavity of the pump housing (200), wherein the rotating shaft (100) extends into the pump cavity; The pump housing (200) comprises a center bearing (220) abutting against an open portion of the isolation sleeve (140); the impeller (300) is located on a side of the center bearing (220) away from the isolation sleeve (140); the center bearing (220) is provided with an axial through hole (221) penetrating along the axial direction of the rotating shaft (100); the axial through hole (221) communicates with the isolation sleeve (140) and the pump chamber; the center bearing (220) is also provided with a liquid inlet channel (150) for allowing liquid in the pump chamber to enter the isolation sleeve (140); The rotating shaft (100) is sleeved with a guide sleeve (400) located between the impeller (300) and the rotor (110); the guide sleeve (400) is located in the shaft through hole (221) and abuts against the rotor (110); and a clearance fit is formed between the guide sleeve (400) and the shaft through hole (221); A first flow channel (101) and a second flow channel (102) are respectively provided at both ends of the rotating shaft (100); the rotating shaft (100) has a solid section located between the first flow channel (101) and the second flow channel (102); the first flow channel (101) is located at an end of the rotating shaft (100) away from the impeller (300), and the second flow channel (102) is located at an end of the rotating shaft (100) close to the impeller (300); A third flow channel (111) is formed in a recessed manner on the circumferential surface of the rotor (110) that cooperates with the rotating shaft (100); the third flow channel (111) extends along the axial direction of the rotating shaft (100) and extends from one end of the rotor (110) to the other end; The first flow channel (101) is connected to the isolation sleeve (140) and the third flow channel (111), so that the liquid in the isolation sleeve (140) enters the third flow channel (111) through the first flow channel (101); the guide sleeve (400) is provided with a fourth flow channel (410) connected to the third flow channel (111); The second flow channel (102) is connected to the fourth flow channel (410) and the pump chamber, so that the liquid in the fourth flow channel (410) enters the pump chamber through the second flow channel (102).

2. The canned motor pump structure according to claim 1, characterized in that: The axial length of the solid section is L1, the axial length of the first flow channel (101) is L3, and the axial length of the second flow channel (102) is L2, wherein L1>L2+L3.

3. The canned motor pump structure according to claim 1, characterized in that: The first flow channel (101) is formed with a first liquid inlet port (1011) on the end of the rotating shaft (100) away from the impeller (300), and at least one first liquid outlet port (1012) is formed on the circumferential wall of the rotating shaft (100); The second flow channel (102) is formed with a second liquid inlet port (1021) on the end of the rotating shaft (100) close to the impeller (300), and at least one second liquid outlet port (1022) is formed on the circumferential wall of the rotating shaft (100); The first liquid outlet port (1012) is located in the third flow channel (111), the second liquid outlet port (1022) is located in the fourth flow channel (410), and the axial distance between the first liquid outlet port (1012) and the second liquid outlet port (1022) is the axial length L1 of the solid section.

4. The canned motor pump structure according to claim 1, characterized in that: An elastic member (500) is disposed between the impeller (300) and the guide sleeve (400), and the elastic member (500) is configured to limit the degree of freedom of translation of the impeller (300) toward the guide sleeve (400); A first transition ring (510) is fixedly provided on the rotating shaft (100), the first transition ring (510) being located on a side of the impeller (300) away from the elastic member (500), the impeller (300) being provided with a first positioning pin (520) abutting against the first transition ring (510), the first positioning pin (520) being configured to limit the degree of freedom of translation of the impeller (300) towards the first transition ring (510).

5. The canned motor pump structure according to claim 1, characterized in that: A spiral groove (420) is provided on the outer peripheral wall of the guide sleeve (400), and the spiral groove (420) is configured to accelerate the liquid in the shaft through hole (221) to flow toward the isolation sleeve (140).

6. The canned motor pump structure according to claim 5, characterized in that: The guide sleeve (400) is provided with a rotating cutting notch (430) at the end close to the rotor (110), and the rotating cutting notch (430) makes the outer diameter of the end of the guide sleeve (400) close to the rotor (110) smaller than the outer diameter of the outer peripheral wall of the guide sleeve (400) provided with the spiral groove (420), wherein the rotating cutting notch (430) is located outside the shaft through hole (221), and the spiral groove (420) is located inside the shaft through hole (221).

7. The canned motor pump structure according to claim 1, characterized in that: The guide sleeve (400) is hollow inside and has an open end and a closed end. The end of the guide sleeve (400) close to the impeller (300) is a closed end, and the other end away from the impeller (300) is an open end. The closed end of the guide sleeve (400) is provided with a first through hole (440) for the rotating shaft (100) to pass through. A partition (450) parallel to the closed end is provided in the hollow cavity of the guide sleeve (400); a second through hole (451) opposite to the first through hole (440) and for the rotation shaft (100) to pass through is provided on the partition (450); a plurality of third through holes (452) are also provided on the partition (450); the plurality of third through holes (452) are distributed at equal intervals on the periphery of the second through hole (451) in the circumferential direction; The partition plate (450) is distributed close to the opening end of the guide sleeve (400), and there is a first distance between the partition plate and the opening end of the guide sleeve (400), and the recessed space (470) formed by the first distance is configured to gather liquid flowing out through the third flow channel (111); The space between the partition plate (450) and the closed end of the guide sleeve (400) is an inner cavity (460) of the guide sleeve (400), and the inner cavity (460), the third through hole (452) and the recessed space (470) constitute the fourth flow channel (410).

8. The canned motor pump structure according to claim 1, characterized in that: The liquid inlet channel (150) comprises a first liquid inlet channel (151) and a second liquid inlet channel (152); the first liquid inlet channel (151) is arranged parallel to the axial direction of the rotating shaft (100), and the liquid inlet of the first liquid inlet channel (151) is arranged close to the pump outlet (240); The second liquid inlet channel (152) is arranged at an inclined angle and is distributed at an acute angle with the central axis of the rotating shaft (100); the liquid inlet of the second liquid inlet channel (152) is distributed close to the pump inlet (230); and the liquid outlet of the second liquid inlet channel (152) is located on the hole wall of the shaft through hole (221).

9. The canned motor pump structure according to claim 8, characterized in that: The center bearing (220) comprises a disc-shaped body (222) abutting against the open end of the isolation sleeve (140), a frustum (223) coaxially arranged with the disc-shaped body (222) and located inside the isolation sleeve (140), and the axial through hole (221) axially penetrates the disc-shaped body (222) and the frustum (223); The shaft through hole (221) is a stepped hole, comprising a first hole portion (2211) formed on the disc-shaped body (222) and a second hole portion (2212) formed on the frustum (223), wherein the diameter of the first hole portion (2211) is greater than the diameter of the second hole portion (2212); The liquid outlet of the second liquid inlet channel (152) is located on the hole wall of the first hole portion (2211), the guide sleeve (400) is at least partially located in the second hole portion (2212), and there is a clearance fit between the guide sleeve (400) and the second hole portion (2212).

10. The canned motor pump structure according to claim 1, characterized in that: The pump housing (200) comprises the center support (220) and a pump cover (210) connected to a first end of the motor housing (130); the center support (220) and the isolation sleeve (140) are sealed and clamped between the motor housing (130) and the pump cover (210).

Images