Canned motor pump structure

Abstract

The present invention discloses a canned motor pump structure, which includes: a motor part and a pump part. The pump part is located at the front end of the motor part. The motor part includes a rotating shaft and a rotor provided on the rotating shaft. First flow channels and second flow channels 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. A third flow channel is formed by a depression on the circumferential surface of the rotor cooperating 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.

Description

Technical Field

[0001] The present invention belongs to the technical field of pump structures, and particularly relates to a canned motor pump structure. Background Art

[0002] A canned motor pump, also known as a hermetically sealed pump, can be regarded as a structure integrating a motor and a pump. Inside the canned motor pump, there is usually a liquid flow passage, and the liquid medium is circulated in the liquid flow passage to take away the excess heat inside the canned motor pump, so as to avoid the problem of excessive heat inside the canned motor pump. In the prior art, in order to form a liquid flow passage, a through hole axially penetrating through it is usually provided on the rotating shaft, and the rotating shaft bears the weights of the rotor, the impeller and the bearing assembly. The axially penetrating 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 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 canned motor pump structure that can ensure the structural strength of the rotating shaft.

[0004] To solve the above technical problem, the present invention provides a canned motor pump structure, including: a motor housing; a stator provided on the circumferential inner wall of the motor housing; a rotating shaft provided inside the motor housing and extending from a first end of the motor housing to the outside of the motor housing; a rotor provided on the rotating shaft, the rotor being located inside the motor housing and inside the stator, and the rotor cooperating with the stator; an isolation sleeve located inside the motor housing and sleeved on the outer periphery of the rotor, one end of the isolation sleeve being open; a pump housing provided at the first end of the motor housing and abutting against the open end of the isolation sleeve, the pump housing having a pump inlet and a pump outlet; an impeller provided on the rotating shaft and received in a pump chamber of the pump housing, the rotating shaft extending into the pump chamber;

[0005] Wherein, 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 axially penetrating through the rotating shaft, the axial through hole communicates the isolation sleeve and the pump chamber, and the middle bearing is further provided with a liquid inlet channel for allowing the liquid in the pump chamber to enter the isolation sleeve;

[0006] A guide sleeve is sleeved on the rotating shaft between the impeller and the rotor, the guide sleeve is located in the axial through hole and abuts against the rotor, and the guide sleeve is in clearance fit with the axial through hole;

[0007] 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;

[0008] 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.

[0009] 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.

[0010] 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.

[0011] 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;

[0012] 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;

[0013] 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.

[0014] 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;

[0015] 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.

[0016] 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.

[0017] Preferably, a rotary cutting notch is provided at an 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 outside the shaft through hole, and the spiral groove is located within the shaft through hole.

[0018] Preferably, the guide sleeve has a structure with a hollow interior, one end open and the other end closed. The end of the guide sleeve close to the impeller is the closed end, and the other end away from the impeller is the open end. A first through hole for the rotation shaft to pass through is provided at the closed end of the guide sleeve;

[0019] Wherein, a partition parallel to the closed end is provided in the hollow cavity of the guide sleeve. A second through hole for the rotation shaft to pass through, which is opposite to the first through hole, is provided on the partition. A plurality of third through holes are also provided on the partition, and the plurality of third through holes are equidistantly distributed in the circumferential direction on the outer periphery of the second through hole;

[0020] The partition is distributed close to the open end of the guide sleeve, and there is a first distance between the partition and the open end of the guide sleeve. The recessed space formed by the first distance is configured to converge the liquid flowing out through the third flow channel;

[0021] The space between the partition and the closed end of the guide sleeve is the inner cavity of the guide sleeve. The inner cavity, the third through hole and the recessed space constitute the fourth flow channel.

[0022] Preferably, the liquid inlet channel includes 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 rotation shaft, and the liquid inlet of the first liquid inlet channel is distributed close to the pump outlet;

[0023] The second liquid inlet channel is inclined and distributed at an acute angle with respect to the central axis of the rotation 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 through hole.

[0024] Preferably, the middle support includes a disc-shaped body abutting against the open end of the isolation sleeve and a frustum coaxial with the disc-shaped body and located within the isolation sleeve. The shaft through hole axially penetrates through the disc-shaped body and the frustum;

[0025] The shaft through hole is a stepped hole, including a first hole portion formed in the disc-shaped body and a second hole portion formed in the frustum. The diameter of the first hole portion is larger than the diameter of the second hole portion;

[0026] Among them, the liquid outlet of the second liquid inlet channel is located on the pore wall of the first pore part, at least part of the guide sleeve is located in the second pore part, and the guide sleeve and the second pore part are in clearance fit.

[0027] Preferably, the pump housing includes the middle bearing and a pump cover connected to the first end of the motor housing, and the middle bearing and the isolation sleeve are hermetically clamped between the motor housing and the pump cover.

[0028] The technical solution provided by the present invention has the following advantages:

[0029] In this embodiment, a first flow channel and a second flow channel are respectively provided on both ends of the rotating shaft. The rotating shaft has a solid section between the first flow channel and the second flow channel, and a third flow channel is provided on the circumferential surface of the rotor that cooperates with the rotating shaft. Thus, it is possible to avoid arranging axial through holes 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

[0030] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0031] Figure 1 It is a three-dimensional structure diagram of the canned motor pump structure provided by the present invention;

[0032] Figure 2 It is a sectional structure diagram of the canned motor pump structure provided by the present invention;

[0033] Figure 3 For Figure 2 The enlarged structure diagram of area A in

[0034] Figure 4 It is an exploded diagram of a part of the canned motor pump structure provided by the present invention;

[0035] Figure 5 It is a structure diagram of the middle bearing from the first perspective;

[0036] Figure 6 It is a structure diagram of the middle bearing from the second perspective;

[0037] Figure 7 It is a structure diagram of the middle bearing from the third perspective;

[0038] Figure 8 It is a sectional structure diagram of the middle bearing;

[0039] Figure 9 It is a three-dimensional structure schematic diagram of the pump cover;

[0040] Figure 10 It is a structure schematic diagram of the front end cover;

[0041] Figure 11 It is a cross-sectional structure schematic diagram of the isolation sleeve;

[0042] Figure 12 It is a schematic diagram of the rear end cover in the first direction;

[0043] Figure 13 It is a schematic diagram of the rear end cover in the second direction;

[0044] Figure 14 It is a three-dimensional structure schematic diagram of the guide sleeve;

[0045] Figure 15 It is a cross-sectional structure schematic diagram of the guide sleeve;

[0046] Figure 16 It is a three-dimensional structure schematic diagram of the rotating shaft;

[0047] Figure 17 It is a cross-sectional structure schematic diagram of the rotating shaft;

[0048] Figure 18 It is a structure schematic diagram of the rotor;

[0049] Figure 19 It is a structure schematic diagram of the impeller. Detailed implementation manners

[0050] Next, the technical solutions of the present invention will be clearly and completely described 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. Hereinafter, the present invention will be described in detail with reference to the drawings and in conjunction with the embodiments. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0051] 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 do not necessarily need to be used to describe a specific order or sequence.

[0052] In the present invention, unless otherwise stated, the orientation terms such as "upper, lower, top, bottom" are usually in the direction shown in the drawings, or in the vertical, perpendicular or gravitational direction of the component itself; similarly, for the convenience of understanding and description, "inner, outer" refer to the inner and outer of the contour of each component itself, but the above orientation terms do not limit the present invention.

[0053] The present invention provides a canned motor pump structure, and the canned motor pump structure includes: a motor part and a pump part. 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. As Figures 1 to 4 shown, the motor part includes a motor housing 130, a stator 120, a rotor 110, a rotating shaft 100, and a separating sleeve 140; the pump part includes a pump housing 200, an impeller 300, and a guide sleeve 400. The impeller 300 and the guide sleeve 400 are received in the pump housing 200. It should be noted that the axial direction and the circumferential direction mentioned below are based on the rotating shaft 100 as the 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.

[0054] The stator 120 is provided on the circumferential inner wall of the motor housing 130. The rotating shaft 100 is provided in the motor housing 130 and extends from the first end of the motor housing 130 to the outside of the motor housing 130. Among them, the above-mentioned "first end" is the front end of the motor housing 130. The rotor 110 is provided on the rotating shaft 100. The rotor 110 is located in the motor housing 130 and inside the stator 120. The rotor 110 cooperates with the stator 120. The separating sleeve 140 is located in the motor housing 130 and sleeved on the outer circumference of the rotor 110. Among them, one end of the separating sleeve 140 close to the first end of the motor housing 130 is open.

[0055] The pump housing 200 is provided at the first end of the motor housing 130 and abuts against the open end of the separating sleeve 140. The pump housing 200 has a pump chamber, a pump inlet 230, and a pump outlet 240. The pump inlet 230 and the pump outlet 240 are respectively communicated with the pump chamber. The impeller 300 is provided on the rotating shaft 100 and received in the pump chamber. Among them, the part of the rotating shaft 100 located outside the motor housing 130 extends into the pump chamber. Thus, the impeller 300 can be provided on the rotating shaft 100.

[0056] The pump housing 200 includes a middle bearing 220 that abuts against the open part of the separating sleeve 140, and a pump cover 210 that is connected to the first end of the motor housing 130. The middle bearing 220 and the separating sleeve 140 are hermetically clamped between the motor housing 130 and the pump cover 210. The impeller 300 is located on the side of the middle bearing 220 away from the separating sleeve 140.

[0057] As Figures 5 to 8 shown, the middle bearing 220 is provided with an axial through hole 221 that penetrates along the axial direction of the rotating shaft 100. The axial through hole 221 communicates the separating sleeve 140 and the pump chamber. The middle bearing 220 is further provided with a liquid inlet channel 150 that allows the liquid in the pump chamber to enter the separating sleeve 140. Thus, the liquid in the pump chamber can enter the separating sleeve 140.

[0058] Furthermore, as Figure 2As shown, a guide sleeve 400 is sleeved on the rotating shaft 100 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.

[0059] Specifically, as Figure 14 and Figure 15 shown, the guide sleeve 400 has a structure with a hollow interior, an open rear end, and a closed front end. That is to say, the end of the guide sleeve 400 close to the impeller 300 is the closed end, and the other end far from the impeller 300 is the 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.

[0060] A partition plate 450 parallel to the closed end is provided in the hollow cavity of the guide sleeve 400. The partition plate 450 is provided with a second through hole 451 opposite to the first through hole 440 for the rotating shaft 100 to pass through. The partition plate 450 is also provided with a plurality of third through holes 452, and the plurality of third through holes 452 are equally spaced in the circumferential direction on the outer periphery of the second through hole 451.

[0061] The partition plate 450 is distributed close to the open end of the guide sleeve 400, and there is a first distance H between the partition plate 450 and the open end of the guide sleeve 400. The above first distance H forms a recessed space 470. The space between the partition plate 450 and the closed end of the guide sleeve 400 is the inner cavity 460 of the guide sleeve 400.

[0062] The guide sleeve 400 and the shaft through hole 221 are in clearance fit. When the guide sleeve 400 rotates, there will be no frictional 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 a 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.

[0063] Furthermore, a spiral groove 420 is provided on the outer peripheral wall of the guide sleeve 400. The spiral groove 420 is used to accelerate the flow of the liquid in the shaft through hole 221 towards the inside of the isolation sleeve 140. When the guide sleeve 400 rotates together with the rotating shaft 100, it can further accelerate the flow rate of the liquid in the shaft through hole 221, which is more conducive to the liquid in the pump cavity entering the isolation sleeve 140.

[0064] The end of the guide sleeve 400 close to the rotor 110 is provided with a rotary cutting notch 430. The rotary 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. Among them, the rotary cutting notch 430 is located outside the shaft through hole 221, and the spiral groove 420 is located in the shaft through hole 221.

[0065] Since the guide sleeve 400 abuts against 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 to the liquid being discharged from the shaft through-hole 221 into the isolation sleeve 140 after being pressurized by the spiral groove 420, reducing the discharge resistance.

[0066] As Figure 2 , Figure 3 , Figure 5 and Figure 6 shown, the liquid inlet passage 150 includes a first liquid inlet passage 151 and a second liquid inlet passage 152. The first liquid inlet passage 151 is distributed parallel to the axial direction of the rotating shaft 100, and the liquid inlet of the first liquid inlet passage 151 is close to the pump outlet 240. The pressure at the pump outlet 240 is relatively high. Under the action of the relatively high pressure, the liquid in the pump chamber can quickly enter the isolation sleeve 140 through the first liquid inlet passage 151.

[0067] The second liquid inlet passage 152 is inclined and distributed at an acute angle with respect to the central axis of the rotating shaft 100. The liquid inlet of the second liquid inlet passage 152 is close to the pump inlet 230, and the liquid outlet M of the second liquid inlet passage 152 is located on the hole wall of the shaft through-hole 221. Since the second liquid inlet passage 152 is inclined, the liquid inlet of the second liquid inlet passage 152 is obliquely above the liquid outlet M of the second liquid inlet passage 152, which is beneficial to the liquid entering the shaft through-hole 221 from the pump chamber 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.

[0068] In this embodiment, by providing two liquid inlet passages, the speed of the liquid in the pump chamber entering the isolation sleeve 140 can be effectively increased, and the liquid inlet efficiency is high, thereby avoiding the poor heat dissipation effect caused by the liquid volume in the isolation sleeve 140 not reaching the preset liquid volume after the above-mentioned motor part works for a period of time.

[0069] In this embodiment, the pump cover 210 is fixedly arranged at the first end of the motor housing 130 through a first fastener (not shown in the figure), and the first fastener is a bolt. After the pump cover 210 is connected to the motor housing 130, the positions of the middle bearing 220 and the isolation sleeve 140 are fixed, and no additional installation structure needs to be provided, which simplifies the structure of the isolation sleeve 140 and greatly simplifies the installation process.

[0070] As Figure 2 and Figure 9 shown, a front bearing chamber 211 is formed by the inner wall of the pump cover 210 being recessed axially. A 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. Among them, a front liquid passage 105 extending axially is formed by being recessed on the inner ring of the front bearing 104.

[0071] As Figure 7 andFigure 8 As shown, the middle bearing 220 includes a disc-shaped body 222 abutting against the open end of the isolation sleeve 140, and a frustum 223 coaxially arranged with the disc-shaped body 222 and located inside the isolation sleeve 140. The axial through-hole 221 axially penetrates through the disc-shaped body 222 and the frustum 223.

[0072] In this embodiment, there is a receiving space axially between the front end of the rotor 110 and the rear end face of the disc-shaped body 222, and the above-mentioned frustum 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 there is sufficient space at the front end of the isolation sleeve 140 to store liquid.

[0073] As Figure 8 shown, the axial through-hole 221 is a stepped hole, including a first hole portion 2211 formed in the disc-shaped body 222 and a second hole portion 2212 formed in the frustum 223. Among them, the diameter of the first hole portion 2211 is larger than the diameter of the second hole portion 2212.

[0074] It should be noted that, as Figure 2 , Figure 3 and Figure 8 shown, the liquid outlet M 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 inside the second hole portion 2212, and there is a clearance fit between the guide sleeve 400 and the second hole portion 2212. Preferably, the part of the guide sleeve 400 provided with the spiral groove 420 is located inside the second hole portion 2212, and the rotary cutting notch 430 is located outside the second hole portion 2212.

[0075] The motor housing 130 includes a main housing 133, a front end cover 131 provided at the front end of the main housing 133, and a rear end cover 132 provided at the rear end of the main housing 133. The main housing 133 is hollow inside and open at both ends, and the stator 120 and the rotor 110 are located inside the main housing 133.

[0076] The main housing 133, the front end cover 131 and the rear end cover 132 are connected by a second fastener (not shown in the figure); in one case, the second fastener is a long bolt, and the second fastener passes through the rear end cover 132, the main housing 133 and the front end cover 131 from back to front in sequence to connect the rear end cover 132, the main housing 133 and the front end cover 131 into a whole. The number of long bolts can be two or three, and they are equally spaced circumferentially; in another case, the second fastener is an ordinary bolt (shorter than the long bolt), the front end cover 131 and the main housing 133 are connected by the second fastener, and the rear end cover 132 and the main housing 133 are also connected by the second fastener.

[0077] As Figure 10 and Figure 11As shown, the front end cover 131 is annular. A limiting groove shoulder 1311 is recessed on the front end face of the front end cover 131. The front end of the isolation sleeve 140 is provided with a front flange 141 that abuts and cooperates with the limiting 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 support 220 is also located within the above-mentioned limiting groove shoulder 1311. Thus, when the pump cover 210 is connected to the front end cover 131, the positions of the middle support 220 and the isolation sleeve 140 are also fixed. During disassembly and assembly, only the first fastener needs to be operated, which has the advantage of being convenient for disassembly and assembly.

[0078] In this embodiment, the isolation sleeve 140 is made by a method of stretching or roll-plate welding with flanges at both ends. Specifically, the isolation sleeve 140 includes a cylindrical middle portion 143, the above-mentioned front flange 141 located at the front end of the middle portion 143, and the above-mentioned 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 an integral body. Among them, a fourth through-hole 1421 is provided on the rear flange 142.

[0079] As Figure 12 and Figure 13 shown, a first boss 1321 is provided on the front end face of the rear end cover 132. A second boss 1322 is provided on the front end face of the first boss 1321. A rear bearing chamber 1323 is recessed on the front end face of the second boss 1322. A rear bearing 103 is provided in the rear bearing chamber 1323. The rear bearing 103 is sleeved on the rotating shaft 100 and is used to support the rotating shaft 100 from the rear end. As Figure 2 shown, a rear liquid passage 106 extending axially is recessed on the inner ring of the rear bearing 103.

[0080] The outer diameter of the first boss 1321 is larger than the outer diameter of the second boss 1322 to form a stepped structure. Among them, the first boss 1321 abuts against the rear end of the isolation sleeve 140, and the second boss 1322 passes through the fourth through-hole 1421 of the rear flange 142.

[0081] A sealing structure is provided between the rear end cover 132 and the isolation sleeve 140 to prevent the liquid in the isolation sleeve 140 from leaking out. A liquid leakage detection channel 1324 is also provided on the rear end cover 132. The liquid leakage detection channel 1324 axially penetrates the rear end cover 132, and the liquid leakage detection channel 1324 is located on the outer periphery of the rear bearing chamber 1323.

[0082] In order to enable the liquid to circulate between the motor part and the pump part, a liquid flow channel is provided on the rotating shaft 100. Specifically, as Figure 16 and Figure 17As shown, a first flow channel 101 and a second flow channel 102 are respectively provided on both end sides of the rotating shaft 100. Among them, the first flow channel 101 is located on the rear end side of the rotating shaft 100 away from the impeller 300, and the second flow channel 102 is located on the front end side of the rotating shaft 100 close to the impeller 300.

[0083] As Figure 18 shown, a third flow channel 111 is formed by a depression on the circumferential surface of the rotor 110 that mates 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 (front end) to the other end (rear end) of the rotor 110.

[0084] As Figure 2 and Figure 3 shown, the first flow channel 101 communicates with the third flow channel 111 through the isolation sleeve 140, 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 communicates with the rear bearing chamber 1323, and the rear bearing chamber 1323 communicates with the isolation sleeve 140 through the rear liquid passing channel 106. Thus, the liquid in the isolation sleeve 140 enters the rear bearing chamber 1323 through the rear liquid passing channel 106, and the liquid in the rear bearing chamber 1323 enters the third flow channel 111 through the first flow channel 101.

[0085] A fourth flow channel 410 communicating with the third flow channel 111 is further provided in the guide sleeve 400. Among them, 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 converge the liquid flowing out of the third flow channel 111, and the liquid in the recessed space 470 enters the inner cavity 460 through a plurality of third through holes 452.

[0086] The second flow channel 102 communicates the fourth flow channel 410 with 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, and the second flow channel 102 communicates with the front bearing chamber 211. The front bearing chamber 211 communicates with the pump chamber through the front liquid passing channel 105.

[0087] In this embodiment, as Figure 17 shown, the rotating shaft 100 has a solid section between the first flow channel 101 and the second flow channel 102. Among them, 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, where L1 > L2 + L3. Thus, it is ensured that the rotating shaft 100 has sufficient structural strength and good load-bearing effect.

[0088] 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.

[0089] 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.

[0090] like Figure 2 As 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.

[0091] like Figure 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.

[0092] 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: A motor housing (130), a stator (120), a rotating shaft (100), a rotor (110), a spacer sleeve (140), a pump housing (200), and an impeller (300); The pump housing (200) comprises a middle support (220) abutting against an open portion of the isolation sleeve (140); the middle support (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 middle support (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); 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); The end of the guide sleeve (400) close to the rotor (110) is provided with a rotary cutting notch (430), and the rotary 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 rotary cutting notch (430) is located outside the shaft through hole (221), and the spiral groove (420) is located inside the shaft through hole (221); 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).

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 freedom of the impeller (300) to translate toward the guide sleeve (400); a first transition ring (510) is fixedly disposed on the rotating shaft (100), and the first transition ring (510) is located on a 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), and the first positioning pin (520) is configured to limit the freedom of the impeller (300) to translate toward the first transition ring (510).

5. 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 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 of the second liquid inlet channel (152) is located on the hole wall of the shaft through hole (221).

6. The canned motor pump structure according to claim 5, 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).

7. 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).

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