Non-shaft seal type energy-saving centrifugal pump with flow dividing function

Abstract

The invention relates to the technical field of drainage pumps, in particular to a non-shaft seal type energy-saving centrifugal pump with a flow dividing function, which comprises a pump body, a volute, a water inlet and a water outlet, the water inlet is formed in the front end surface of the volute, the water outlet is formed in the circumferential surface of the volute, and the water inlet is communicated with the water outlet; the first backflow hole is formed in the volute; the impeller is arranged in the inner cavity of the volute, and a balance hole is formed in the impeller; the front end of the servo motor shaft is provided with an installation shaft head, and the installation shaft head and the impeller are installed and fixed in a threaded mode. Residual liquid does not leak like the rear portion, if leakage occurs, the residual liquid flows back to the interior of a low-pressure position through the backflow groove and the backflow hole, a set of auxiliary blades are arranged behind the backflow groove, the auxiliary blades rotate together with the shaft during starting, and it is further guaranteed that the residual liquid does not leak in the axial direction.

Description

Technical Field

[0001] The present invention relates to the technical field of drainage pumps, in particular to a non-shaft-sealed energy-saving centrifugal pump with a diversion function. Background Art

[0002] During the operation of the washing machine, the washed clothes need to be dehydrated, and the sewage generated after dehydration needs to be discharged promptly and quickly. Therefore, the drainage pump that quickly discharges the sewage is one of the important components of the washing machine.

[0003] Washing machine drain pumps typically don't use electromagnetic pumps or centrifugal pumps with shaft seals for the following reasons: 1. Electromagnetic pumps rely on electromagnetic coupling technology to achieve a sealless design. While these pumps offer leak-proofing advantages, their core components require customized magnets and a sophisticated control system, resulting in significantly higher manufacturing costs than traditional drain pumps. As a mass consumer product, washing machines prioritize overall cost control. As an auxiliary component, using an electromagnetic pump significantly increases the price.

[0004] 2. The cost of centrifugal pumps with mechanical shaft seals is still relatively high, and the sewage discharged by the washing machine drain pump often contains impurities such as fibers and hair, which can easily cause seal wear or jamming, thereby increasing the risk of failure.

[0005] 3. The cost of a centrifugal pump with a stuffing seal is lower, but the washing machine is a complete machine, and the drain pump is integrated into the sealed environment inside the washing machine. Users cannot replace the stuffing in time, and frequently seeking after-sales personnel to replace the stuffing seal ring is obviously unrealistic.

[0006] To avoid these issues, washing machine drain pumps typically use miniature shaded-pole pumps. These pumps feature a simple motor structure and high reliability, using electromagnetic induction to rotate the impeller to deliver liquid. However, these pumps still have significant limitations: poor sealing results in a short service life and a high failure rate.

[0007] Therefore, it is urgent to design a non-shaft-sealed energy-saving centrifugal pump with a diversion function to solve the current technical problems of short service life and high failure rate of the drainage pump sealing structure.

[0008] It should be noted that the above information disclosed in this Background section is only for understanding the background technology of the present application concept, and therefore, it may contain information that does not constitute prior art. Summary of the Invention

[0009] The embodiments of the present disclosure at least provide a non-shaft-sealed energy-saving centrifugal pump with a diversion function.

[0010] The present disclosure provides a non-shaft-sealed energy-saving centrifugal pump with a diversion function, comprising a pump body, a volute, a water inlet, and a water outlet, wherein the front end surface of the volute is provided with the water inlet, the circumferential surface of the volute is provided with the water outlet, the water inlet and the water outlet are connected, and further comprising: a first reflux hole, which is provided on the volute;

[0011] An impeller is arranged in the inner cavity of the volute, and a balancing hole is opened on the impeller;

[0012] A servo motor shaft, wherein a mounting shaft head is provided at the front end of the servo motor shaft, and the mounting shaft head is fixedly mounted on the impeller thread;

[0013] A sealing body is provided at the rear side of the impeller, wherein a mounting hole is provided at the axis of the sealing body, and the servo motor shaft is fixedly mounted in the mounting hole;

[0014] A rear cover plate is bolted to the rear side of the pump body, a reflux groove is provided in the rear cover plate, a second reflux hole is provided on the reflux groove, and the second reflux hole corresponds to the position of the volute, a plurality of fixing holes are provided on the rear end surface of the rear cover plate, and a stepped surface is also provided on the rear cover plate;

[0015] a bearing, mounted in the step surface;

[0016] A first sealing ring is placed at the interface between the volute and the rear cover;

[0017] The second sealing ring is placed on the interface between the sealing body and the bearing.

[0018] In an optional embodiment, a low-pressure chamber is provided on the front end surface of the sealing body.

[0019] In an optional embodiment, the rear end surface of the sealing body is further provided with auxiliary blades.

[0020] In an optional embodiment, a thread groove is machined on the inner wall of the rear cover.

[0021] In an optional embodiment, the impeller includes blades and an impeller mounting seat, the blades are welded and fixed to the front end face of the impeller mounting seat, and the back blades are welded and fixed to the rear end face of the impeller mounting seat.

[0022] In an optional embodiment, the back blade and the blade have the same profile line but in opposite directions.

[0023] In an optional embodiment, a return pipe is installed at the first return hole, a water inlet pipe is installed at the water inlet, and the return pipe is connected to the water inlet pipe.

[0024] In an optional embodiment, a check valve is provided in the reflux pipe.

[0025] The beneficial effects of the present invention are: 1. A balancing hole is provided on the impeller, which can connect the liquid in the gap between the rear end face of the impeller and the front end face of the rear cover plate to the vacuum low-pressure area near the axis of the impeller through the balancing hole, thereby achieving axial force balance and greatly extending the service life of the impeller.

[0026] 2. A back blade is welded and fixed to the rear end of the impeller mounting seat. The back blade has the same profile as the blade but in the opposite direction. During drainage, the back blade can act as a small pump, assisting in the work, increasing the function of the blade, and helping the balance hole to complete internal recirculation.

[0027] 3. When the servo motor shaft drives the impeller to rotate, the sealing body is fixed on the servo motor shaft and rotates synchronously with the servo motor shaft, while the rear cover is in a stationary state. Therefore, there must be a gap between the outer circumference of the sealing body and the inner circumference of the rear cover. Some sewage will seep into the gap. Therefore, a reflow groove is provided on the rear cover. The reflow groove serves as a low-pressure area, which can store the sewage that has seeped into the space between the outer circumference of the sealing body and the inner circumference of the rear cover, and finally discharge it completely through the second reflow hole and the first reflow hole. If there is still a small amount of sewage that has not been extracted by the low-pressure area of ​​the reflow groove and falls into the step surface, it will be completely isolated by the second sealing ring, thereby achieving a complete sealing of the entire device and completely preventing sewage from entering the servo motor below.

[0028] 4. A low-pressure chamber is provided on the front end face of the sealing body. As an additional low-pressure area, the low-pressure chamber can temporarily store the liquid in the gap between the rear end face of the impeller and the front end face of the rear cover, further ensuring that the sewage in the gap flows to the balance hole.

[0029] 5. The rear end face of the sealing body is also provided with auxiliary blades, which rotate together with the servo motor shaft during drainage operation. Under the action of centrifugal force, the auxiliary blades further ensure that the small amount of residual liquid does not leak toward the servo motor axis. Even if there is a slight leakage, the second sealing ring can still achieve a sealing effect.

[0030] 6. The inner wall of the rear cover is processed with a thread groove. Since the thread groove and the outer wall of the sealing body can form a long spiral sealing groove, the high-pressure residual liquid in the gap is reduced in pressure and speed in the spiral sealing groove, which can further ensure that the residual liquid will directly enter the reflux groove when it leaks to the rear.

[0031] 7. A return pipe is installed at the first return hole, and a water inlet pipe is installed at the water inlet, the return pipe is connected to the water inlet pipe. A check valve is installed in the return pipe to prevent water at the water inlet pipe from flowing back into the water inlet.

[0032] 8. The present invention improves and processes traditional centrifugal pump components, and realizes non-shaft seal multi-stage sealing through the coordinated action of various components. The sealing performance is significantly improved compared with the micro shaded pole drainage pump. It is used as a washing machine drainage pump, with a longer service life and greatly reduced production costs. At the same time, the drainage performance is also significantly improved compared with the micro shaded pole drainage pump.

[0033] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or understood by practicing the present invention. The purposes and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description, claims and drawings.

[0034] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0036] Figure 1 A first structural schematic diagram of a non-shaft-sealed energy-saving centrifugal pump with a diversion function provided by an embodiment of the present disclosure;

[0037] Figure 2 An exploded diagram of a non-shaft-sealed energy-saving centrifugal pump with a diversion function provided by an embodiment of the present disclosure;

[0038] Figure 3 A schematic structural diagram of a rear cover provided in an embodiment of the present disclosure;

[0039] Figure 4 A first cross-sectional view of a non-shaft-sealed energy-saving centrifugal pump with a flow diversion function provided by an embodiment of the present disclosure;

[0040] Figure 5 for Figure 4 A partial enlarged view of part A;

[0041] Figure 6 A second cross-sectional view of a non-shaft-sealed energy-saving centrifugal pump with a flow diversion function provided by an embodiment of the present disclosure;

[0042] Figure 7 This is a second structural schematic diagram of a non-shaft-sealed energy-saving centrifugal pump with a diversion function provided in an embodiment of the present disclosure.

[0043] In the picture:

[0044] 1. Pump body; 11. Volute; 12. Water inlet; 13. Water outlet; 14. Water inlet pipe; 15. First return hole;

[0045] 2. Impeller; 21. Blades; 22. Impeller mounting seat; 23. Balancing hole; 24. Back blades;

[0046] 3. Servo motor shaft; 31. Install the shaft head;

[0047] 4. Sealing body; 41. Low-pressure chamber; 42. Mounting hole; 43. Auxiliary blade;

[0048] 5. Rear cover; 51. Reflux groove; 52. Threaded groove; 53. Second reflux hole; 54. Fixing hole; 55. Step surface; 56. Reflux pipe;

[0049] 6. Bearing; 7. First sealing ring; 8. Second sealing ring. DETAILED DESCRIPTION

[0050] To make the objectives, technical solutions, and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present disclosure, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present disclosure without making any creative efforts shall fall within the scope of protection of the present disclosure.

[0051] Research has found that washing machine drain pumps typically avoid electromagnetic pumps or centrifugal pumps with shaft seals. The reasons are as follows: 1. Electromagnetic pumps rely on electromagnetic coupling technology to achieve a sealless design. While these pumps offer leak-proofing advantages, their core components require customized magnets and a sophisticated control system, resulting in significantly higher manufacturing costs than traditional drain pumps. As a mass consumer product, washing machines prioritize overall cost control. As an auxiliary component, using an electromagnetic pump significantly increases the price.

[0052] 2. The cost of centrifugal pumps with mechanical shaft seals is still relatively high, and the sewage discharged by the washing machine drain pump often contains impurities such as fibers and hair, which can easily cause seal wear or jamming, thereby increasing the risk of failure.

[0053] 3. The cost of a centrifugal pump with a stuffing seal is lower, but the washing machine is a complete machine, and the drain pump is integrated into the sealed environment inside the washing machine. Users cannot replace the stuffing in time, and frequently seeking after-sales personnel to replace the stuffing seal ring is obviously unrealistic.

[0054] To avoid these issues, washing machine drain pumps typically use miniature shaded-pole pumps. These pumps feature a simple motor structure and high reliability, using electromagnetic induction to rotate the impeller to deliver liquid. However, these pumps still have significant limitations: poor sealing results in a short service life and a high failure rate.

[0055] Therefore, it is urgent to design a non-shaft-sealed energy-saving centrifugal pump with a diversion function to solve the current technical problems of short service life and high failure rate of the drainage pump sealing structure.

[0056] The defects in the above solutions are the results obtained by the inventors after practice and careful research. Therefore, the process of discovering the above problems and the solutions proposed by this disclosure for the above problems below should be the contributions made by the inventors to this disclosure during the disclosure process.

[0057] The following describes some embodiments of the present invention in detail with reference to the accompanying drawings. The following embodiments and features thereof may be combined with one another unless they conflict. Furthermore, in the accompanying drawings, the thickness of components may be exaggerated or reduced to effectively illustrate the technical content.

[0058] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0059] Based on the above research, please refer to Figures 1-4The embodiment of the present disclosure provides a non-shaft-sealed energy-saving centrifugal pump with a diversion function, comprising a pump body 1, a volute 11, a water inlet 12 and a water outlet 13. The front end surface of the volute 11 is provided with the water inlet 12, and the circumferential surface of the volute 11 is provided with the water outlet 13, and the water inlet 12 and the water outlet 13 are communicated; the pump also comprises: a first reflux hole 15, which is provided on the volute 11; an impeller 2, which is provided in the internal cavity of the volute 11, and a balancing hole 23 is provided on the impeller 2; a servo motor shaft 3, a mounting shaft head 31 is provided at the front end of the servo motor shaft 3, and the mounting shaft head 31 is threadedly mounted and fixed to the impeller 2; a sealing body 4, which is provided on the impeller 2, a mounting hole 42 is provided at the axis of the sealing body 4, and the servo motor shaft 3 is fixedly installed in the mounting hole 42; a rear cover plate 5 is bolted to the rear side of the pump body 1, a reflux groove 51 is provided in the rear cover plate 5, a second reflux hole 53 is provided on the reflux groove 51, and the second reflux hole 53 corresponds to the position of the volute 11, a plurality of fixing holes 54 are provided on the rear end surface of the rear cover plate 5, and a step surface 55 is also provided on the rear cover plate 5; a bearing 6 is installed in the step surface 55; a first sealing ring 7 is placed at the intersection of the volute 11 and the rear cover plate 5; a second sealing ring 8 is placed at the intersection of the sealing body 4 and the bearing 6.

[0060] In some embodiments, the impeller 2 is driven to rotate at high speed by the rotation of the servo motor shaft 3. At this time, the sewage at the impeller 2 is thrown out in the direction away from the servo motor shaft 3 under the action of centrifugal force. At this time, the area near the axis of the impeller 2 is a vacuum low-pressure area, while the edge of the impeller 2 is a high-pressure area. Since there is a gap between the rear end face of the impeller 2 and the front end face of the rear cover plate 5, the liquid in the high-pressure area at the edge of the impeller 2 will be squeezed into the gap, giving the impeller 2 an axial force in the direction of the water inlet 12. If the impeller 2 is in this axial force imbalance condition for a long time, it will cause frequent failures.

[0061] Since the balancing hole 23 is provided on the impeller 2, the liquid in the gap between the rear end face of the impeller 2 and the front end face of the rear cover plate 5 can be connected to the vacuum low-pressure area near the axis of the impeller 2 through the balancing hole 23, thereby achieving axial force balance and greatly extending the service life of the impeller 2.

[0062] While the servo motor shaft 3 drives the impeller 2 to rotate, the sealing body 4 is fixed on the servo motor shaft 3 and rotates synchronously with the servo motor shaft 3, while the rear cover plate 5 is in a stationary state. Therefore, there must be a gap between the outer circumference of the sealing body 4 and the inner circumference of the rear cover plate 5. Some sewage will seep into the gap. Therefore, a reflow groove 51 is provided on the rear cover plate 5. The reflow groove 51 serves as a low-pressure area, which can store the sewage that has seeped into the space between the outer circumference of the sealing body 4 and the inner circumference of the rear cover plate 5, and finally discharge it completely through the second reflow hole 53 and the first reflow hole 15. If there is still a small amount of sewage that has not been extracted by the low-pressure area of ​​the reflow groove 51 and falls into the step surface 55, it will be completely isolated by the second sealing ring 8, thereby achieving complete sealing of the entire device and completely preventing sewage from entering the servo motor below.

[0063] It should be noted that the rear side of the volute 11 is pre-welded with bolts (not shown in the figure) for installing the rear cover plate 5. By passing the bolts through the fixing holes 54 and then through the nuts (not shown in the figure), the rear cover plate 5 can be fixed to the rear side of the volute 11. At the same time, the pump body 1 and the rear cover plate 5 are provided with mounting grooves for placing the first sealing ring 7 to prevent sewage from leaking from between the pump body 1 and the rear cover plate 5. Since the pump body 1 and the rear cover plate 5 are fixed by bolts and are stationary, the pump body 1 and the rear cover plate 5 fit tightly together, and the first sealing ring 7 is sufficient to achieve a sealing effect. This is common technical knowledge in this field, so it will not be elaborated on.

[0064] As a further embodiment of the present invention, a low-pressure chamber 41 is provided on the front end face of the sealing body 4. The low-pressure chamber 41 serves as an additional low-pressure area, which can temporarily store the liquid in the gap between the rear end face of the impeller 2 and the front end face of the rear cover plate 5, further ensuring that the sewage in the gap flows to the balancing hole 23.

[0065] As a further implementation scheme of the present invention, the rear end face of the sealing body 4 is further provided with an auxiliary blade 43, which rotates together with the servo motor shaft 3 during drainage operation. Under the action of centrifugal force, it is further ensured that the small amount of residual liquid does not leak toward the servo motor shaft 3. Even if there is a slight leakage, the second sealing ring 8 can still achieve a sealing effect.

[0066] As a further implementation scheme of the present invention, the inner wall of the rear cover plate 5 is processed with a thread groove 52. Since the thread groove 52 and the outer wall of the sealing body 4 can form a long spiral sealing groove, the high-pressure residual liquid in the gap is reduced in pressure and speed in the spiral sealing groove, which can further ensure that the residual liquid will directly enter the reflux groove 51 when it leaks to the rear.

[0067] See also Figure 1-Figure 5In at least one embodiment, a non-shaft-sealed energy-saving centrifugal pump with a diversion function includes a pump body 1, a volute 11, a water inlet 12, and a water outlet 13. The front end surface of the volute 11 is provided with the water inlet 12, and the circumferential surface of the volute 11 is provided with the water outlet 13, and the water inlet 12 and the water outlet 13 are connected; it also includes: a first reflux hole 15, which is provided on the volute 11; an impeller 2, which is provided in the internal cavity of the volute 11, and a balancing hole 23 is provided on the impeller 2; a servo motor shaft 3, and a mounting shaft head is provided at the front end of the servo motor shaft 3. 31, the mounting shaft head 31 is threadedly mounted and fixed to the impeller 2; the sealing body 4 is arranged on the rear side of the impeller 2, and a mounting hole 42 is opened at the axis of the sealing body 4, and the servo motor shaft 3 is fixedly mounted in the mounting hole 42; the rear cover plate 5 is bolted to the rear side of the pump body 1, and a reflux groove 51 is opened in the rear cover plate 5, and a second reflux hole 53 is opened on the reflux groove 51, and the second reflux hole 53 corresponds to the position of the volute 11. The rear end surface of the rear cover plate 5 is opened with a plurality of fixing holes 54, and the rear cover plate 5 is also opened with a step surface 55;

[0068] The bearing 6 is installed in the step surface 55; the first sealing ring 7 is placed on the interface between the volute 11 and the rear cover plate 5; the second sealing ring 8 is placed on the interface between the sealing body 4 and the bearing 6. In a specific implementation, the impeller 2 is driven to rotate at high speed by the rotation of the servo motor shaft 3. At this time, the sewage at the impeller 2 is thrown out in the direction away from the servo motor shaft 3 under the action of centrifugal force. At this time, the area near the axis of the impeller 2 is a vacuum low-pressure area, while the edge of the impeller 2 is a high-pressure area. Since there is a gap between the rear end face of the impeller 2 and the front end face of the rear cover plate 5, the liquid in the high-pressure area at the edge of the impeller 2 will be squeezed into the gap, giving the impeller 2 an axial force in the direction of the water inlet 12. If the impeller 2 is in this axial force imbalance condition for a long time, it will cause frequent failures.

[0069] Since the balancing hole 23 is provided on the impeller 2, the liquid in the gap between the rear end face of the impeller 2 and the front end face of the rear cover plate 5 can be connected to the vacuum low-pressure area near the axis of the impeller 2 through the balancing hole 23, thereby achieving axial force balance and greatly extending the service life of the impeller 2.

[0070] While the servo motor shaft 3 drives the impeller 2 to rotate, the sealing body 4 is fixed on the servo motor shaft 3 and rotates synchronously with the servo motor shaft 3, while the rear cover plate 5 is in a stationary state. Therefore, there must be a gap between the outer circumference of the sealing body 4 and the inner circumference of the rear cover plate 5. Some sewage will seep into the gap. Therefore, a reflow groove 51 is provided on the rear cover plate 5. The reflow groove 51 serves as a low-pressure area, which can store the sewage that has seeped into the space between the outer circumference of the sealing body 4 and the inner circumference of the rear cover plate 5, and finally discharge it completely through the second reflow hole 53 and the first reflow hole 15. If there is still a small amount of sewage that has not been extracted by the low-pressure area of ​​the reflow groove 51 and falls into the step surface 55, it will be completely isolated by the second sealing ring 8, thereby achieving complete sealing of the entire device and completely preventing sewage from entering the servo motor below.

[0071] It should be noted that the rear side of the volute 11 is pre-welded with bolts (not shown in the figure) for installing the rear cover plate 5. By passing the bolts through the fixing holes 54 and then through the nuts (not shown in the figure), the rear cover plate 5 can be fixed to the rear side of the volute 11. At the same time, the pump body 1 and the rear cover plate 5 are provided with mounting grooves for placing the first sealing ring 7 to prevent sewage from leaking from between the pump body 1 and the rear cover plate 5. Since the pump body 1 and the rear cover plate 5 are fixed by bolts and are stationary, the pump body 1 and the rear cover plate 5 fit tightly together, and the first sealing ring 7 is sufficient to achieve a sealing effect. This is common technical knowledge in this field, so it will not be elaborated on.

[0072] As a further embodiment of the present invention, a low-pressure chamber 41 is provided on the front end face of the sealing body 4. The low-pressure chamber 41 serves as an additional low-pressure area, which can temporarily store the liquid in the gap between the rear end face of the impeller 2 and the front end face of the rear cover plate 5, further ensuring that the sewage in the gap flows to the balancing hole 23.

[0073] As a further implementation scheme of the present invention, the rear end face of the sealing body 4 is further provided with an auxiliary blade 43, which rotates together with the servo motor shaft 3 during drainage operation. Under the action of centrifugal force, it is further ensured that the small amount of residual liquid does not leak toward the servo motor shaft 3. Even if there is a slight leakage, the second sealing ring 8 can still achieve a sealing effect.

[0074] As a further implementation scheme of the present invention, the inner wall of the rear cover plate 5 is processed with a thread groove 52. Since the thread groove 52 and the outer wall of the sealing body 4 can form a long spiral sealing groove, the high-pressure residual liquid in the gap is reduced in pressure and speed in the spiral sealing groove, which can further ensure that the residual liquid will directly enter the reflux groove 51 when it leaks to the rear.

[0075] As a further embodiment of the present invention, the impeller 2 includes blades 21 and an impeller mounting seat 22 . The blades 21 are welded and fixed to the front end surface of the impeller mounting seat 22 , and a back blade 24 is welded and fixed to the rear end surface of the impeller mounting seat 22 .

[0076] In a specific implementation, the back blade 24 has the same profile as the blade 21 but in opposite directions. During drainage, the back blade 24 can act like a small pump to assist in doing work, increase the function of the blade 21, and help the balance hole 23 complete internal reflux.

[0077] See also Figure 1-Figure 7 In at least one embodiment, a non-shaft-sealed energy-saving centrifugal pump with a diversion function includes a pump body 1, a volute 11, a water inlet 12 and a water outlet 13. The front end surface of the volute 11 is provided with the water inlet 12, and the circumferential surface of the volute 11 is provided with the water outlet 13, and the water inlet 12 and the water outlet 13 are connected; it also includes: a first reflux hole 15, which is provided on the volute 11; an impeller 2, which is provided in the internal cavity of the volute 11, and a balancing hole 23 is provided on the impeller 2; a servo motor shaft 3, and a mounting shaft head 31 is provided at the front end of the servo motor shaft 3, and the mounting shaft head 31 is threadedly mounted and fixed to the impeller 2; a sealing body 4 is provided on the impeller On the rear side of the wheel 2, a mounting hole 42 is provided at the axis of the sealing body 4, and the servo motor shaft 3 is fixedly installed in the mounting hole 42; the rear cover plate 5 is bolted to the rear side of the pump body 1, and a reflow groove 51 is provided in the rear cover plate 5, and a second reflow hole 53 is provided on the reflow groove 51, and the second reflow hole 53 corresponds to the position of the volute 11. A plurality of fixing holes 54 are provided on the rear end face of the rear cover plate 5, and a step surface 55 is also provided on the rear cover plate 5; a bearing 6 is installed in the step surface 55; a first sealing ring 7 is placed at the intersection of the volute 11 and the rear cover plate 5; a second sealing ring 8 is placed at the intersection of the sealing body 4 and the bearing 6.

[0078] In a specific implementation, the rotation of the servo motor shaft 3 drives the impeller 2 to rotate at high speed. At this time, the sewage at the impeller 2 is thrown out in the direction away from the servo motor shaft 3 under the action of centrifugal force. At this time, the area near the axis of the impeller 2 is a vacuum low-pressure area, while the edge of the impeller 2 is a high-pressure area. Since there is a gap between the rear end face of the impeller 2 and the front end face of the rear cover plate 5, the liquid in the high-pressure area at the edge of the impeller 2 will be squeezed into the gap, giving the impeller 2 an axial force in the direction of the water inlet 12. If the impeller 2 is in this axial force imbalance condition for a long time, it will cause frequent failures.

[0079] Since the balancing hole 23 is provided on the impeller 2, the liquid in the gap between the rear end face of the impeller 2 and the front end face of the rear cover plate 5 can be connected to the vacuum low-pressure area near the axis of the impeller 2 through the balancing hole 23, thereby achieving axial force balance and greatly extending the service life of the impeller 2.

[0080] While the servo motor shaft 3 drives the impeller 2 to rotate, the sealing body 4 is fixed on the servo motor shaft 3 and rotates synchronously with the servo motor shaft 3, while the rear cover plate 5 is in a stationary state. Therefore, there must be a gap between the outer circumference of the sealing body 4 and the inner circumference of the rear cover plate 5. Some sewage will seep into the gap. Therefore, a reflow groove 51 is provided on the rear cover plate 5. The reflow groove 51 serves as a low-pressure area, which can store the sewage that has seeped into the space between the outer circumference of the sealing body 4 and the inner circumference of the rear cover plate 5, and finally discharge it completely through the second reflow hole 53 and the first reflow hole 15. If there is still a small amount of sewage that has not been extracted by the low-pressure area of ​​the reflow groove 51 and falls into the step surface 55, it will be completely isolated by the second sealing ring 8, thereby achieving complete sealing of the entire device and completely preventing sewage from entering the servo motor below.

[0081] It should be noted that the rear side of the volute 11 is pre-welded with bolts (not shown in the figure) for installing the rear cover plate 5. By passing the bolts through the fixing holes 54 and then through the nuts (not shown in the figure), the rear cover plate 5 can be fixed to the rear side of the volute 11. At the same time, the pump body 1 and the rear cover plate 5 are provided with mounting grooves for placing the first sealing ring 7 to prevent sewage from leaking from between the pump body 1 and the rear cover plate 5. Since the pump body 1 and the rear cover plate 5 are fixed by bolts and are stationary, the pump body 1 and the rear cover plate 5 fit tightly together, and the first sealing ring 7 is sufficient to achieve a sealing effect. This is common technical knowledge in this field, so it will not be elaborated on.

[0082] As a further embodiment of the present invention, a low-pressure chamber 41 is provided on the front end face of the sealing body 4. The low-pressure chamber 41 serves as an additional low-pressure area, which can temporarily store the liquid in the gap between the rear end face of the impeller 2 and the front end face of the rear cover plate 5, further ensuring that the sewage in the gap flows to the balancing hole 23.

[0083] As a further implementation scheme of the present invention, the rear end face of the sealing body 4 is further provided with an auxiliary blade 43, which rotates together with the servo motor shaft 3 during drainage operation. Under the action of centrifugal force, it is further ensured that the small amount of residual liquid does not leak toward the servo motor shaft 3. Even if there is a slight leakage, the second sealing ring 8 can still achieve a sealing effect.

[0084] As a further implementation scheme of the present invention, the inner wall of the rear cover plate 5 is processed with a thread groove 52. Since the thread groove 52 and the outer wall of the sealing body 4 can form a long spiral sealing groove, the high-pressure residual liquid in the gap is reduced in pressure and speed in the spiral sealing groove, which can further ensure that the residual liquid will directly enter the reflux groove 51 when it leaks to the rear.

[0085] As a further embodiment of the present invention, the impeller 2 includes blades 21 and an impeller mounting seat 22 . The blades 21 are welded and fixed to the front end surface of the impeller mounting seat 22 , and a back blade 24 is welded and fixed to the rear end surface of the impeller mounting seat 22 .

[0086] In a specific implementation, the back blade 24 has the same profile as the blade 21 but in opposite directions. During drainage, the back blade 24 can act like a small pump to assist in doing work, increase the function of the blade 21, and help the balance hole 23 complete internal reflux.

[0087] As a further embodiment of the present invention, a return pipe 56 is installed at the first return hole 15 , and a water inlet pipe 14 is installed at the water inlet 12 , and the return pipe 56 is in communication with the water inlet pipe 14 .

[0088] Furthermore, a check valve is provided in the return pipe 56 to prevent water in the water inlet pipe 14 from flowing back into 56 .

[0089] The working principle of the present invention is as follows:

[0090] The rotation of the servo motor shaft 3 drives the impeller 2 to rotate at high speed. At this time, the sewage at the impeller 2 is thrown out in the direction away from the servo motor shaft 3 under the action of centrifugal force. At this time, the area near the axis of the impeller 2 is a vacuum low-pressure area, while the edge of the impeller 2 is a high-pressure area. Since there is a gap between the rear end face of the impeller 2 and the front end face of the rear cover plate 5, the liquid in the high-pressure area at the edge of the impeller 2 will be squeezed into the gap, giving the impeller 2 an axial force in the direction of the water inlet 12. If the impeller 2 is in this axial force imbalance condition for a long time, it will cause frequent failures.

[0091] Since the balancing hole 23 is provided on the impeller 2, the liquid in the gap between the rear end face of the impeller 2 and the front end face of the rear cover plate 5 can be connected to the vacuum low-pressure area near the axis of the impeller 2 through the balancing hole 23, thereby achieving axial force balance and greatly extending the service life of the impeller 2.

[0092] The impeller 2 includes blades 21 and an impeller mounting seat 22. The blades 21 are welded to the front end of the impeller mounting seat 22, and a back blade 24 is welded to the rear end of the impeller mounting seat 22. The back blade 24 has the same profile as the blade 21 but is oriented in opposite directions. During drainage, the back blade 24 acts like a small pump, assisting in the work, increasing the function of the blade 21, and helping the balancing hole 23 to complete internal recirculation.

[0093] While the servo motor shaft 3 drives the impeller 2 to rotate, the sealing body 4 is fixed on the servo motor shaft 3 and rotates synchronously with the servo motor shaft 3, while the rear cover plate 5 is in a stationary state. Therefore, there must be a gap between the outer circumference of the sealing body 4 and the inner circumference of the rear cover plate 5. Some sewage will seep into the gap. Therefore, a reflow groove 51 is provided on the rear cover plate 5. The reflow groove 51 serves as a low-pressure area, which can store the sewage that has seeped into the space between the outer circumference of the sealing body 4 and the inner circumference of the rear cover plate 5, and finally discharge it completely through the second reflow hole 53 and the first reflow hole 15. If there is still a small amount of sewage that has not been extracted by the low-pressure area of ​​the reflow groove 51 and falls into the step surface 55, it will be completely isolated by the second sealing ring 8, thereby achieving complete sealing of the entire device and completely preventing sewage from entering the servo motor below.

[0094] A low-pressure chamber 41 is provided on the front end face of the sealing body 4. The low-pressure chamber 41 serves as an additional low-pressure area and can temporarily store the liquid in the gap between the rear end face of the impeller 2 and the front end face of the rear cover plate 5, further ensuring that the sewage in the gap flows to the balancing hole 23.

[0095] The rear end face of the sealing body 4 is further provided with an auxiliary blade 43, which rotates together with the servo motor shaft 3 during drainage operation. Under the action of centrifugal force, it further ensures that the small amount of residual liquid does not leak toward the servo motor shaft 3. Even if there is a slight leakage, the second sealing ring 8 can still achieve a sealing effect.

[0096] The inner wall of the rear cover plate 5 is processed with a thread groove 52. Since the thread groove 52 and the outer wall of the sealing body 4 can form a long spiral sealing groove, the high-pressure residual liquid in the gap is reduced in pressure and speed in the spiral sealing groove, which can further ensure that the residual liquid will directly enter the reflux groove 51 when it leaks to the rear.

[0097] A return pipe 56 is installed at the first return hole 15 , and a water inlet pipe 14 is installed at the water inlet 12 . The return pipe 56 is in communication with the water inlet pipe 14 .

[0098] Furthermore, a check valve is provided in the return pipe 56 to prevent water in the water inlet pipe 14 from flowing back into 56 .

[0099] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. There may be other division methods in actual implementation. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. With the above-mentioned ideal embodiment of the present invention as inspiration, through the above-mentioned description, relevant staff can make various changes and modifications without departing from the scope of the technical idea of ​​the disclosed embodiment. The technical scope of the disclosed embodiment is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A non-shaft-sealed energy-saving centrifugal pump with a diversion function, comprising a pump body (1), a volute (11), a water inlet (12) and a water outlet (13), wherein the front end surface of the volute (11) is provided with the water inlet (12), the circumferential surface of the volute (11) is provided with the water outlet (13), the water inlet (12) and the water outlet (13) are communicated, and the pump is characterized in that: Also includes: A first reflux hole (15) is provided on the volute (11); An impeller (2) is arranged in the internal cavity of the volute (11), and a balancing hole (23) is opened on the impeller (2); A servo motor shaft (3), wherein a mounting shaft head (31) is provided at the front end of the servo motor shaft (3), and the mounting shaft head (31) is threadedly mounted and fixed to the impeller (2); A sealing body (4) is arranged on the rear side of the impeller (2); a mounting hole (42) is provided at the axis of the sealing body (4); and the servo motor shaft (3) is fixedly mounted in the mounting hole (42); A rear cover plate (5) is bolted to the rear side of the pump body (1), a reflux groove (51) is provided in the rear cover plate (5), a second reflux hole (53) is provided on the reflux groove (51), and the second reflux hole (53) corresponds to the position of the volute (11), a plurality of fixing holes (54) are provided on the rear end surface of the rear cover plate (5), and a step surface (55) is also provided on the rear cover plate (5); A bearing (6) is mounted in the step surface (55); A first sealing ring (7) is placed on the interface between the volute (11) and the rear cover (5); The second sealing ring (8) is placed on the interface between the sealing body (4) and the bearing (6).

2. The non-shaft-sealed energy-saving centrifugal pump with diversion function according to claim 1, characterized in that: A low-pressure chamber (41) is provided on the front end surface of the sealing body (4).

3. The non-shaft-sealed energy-saving centrifugal pump with diversion function according to claim 1, characterized in that: The rear end surface of the sealing body (4) is further provided with an auxiliary blade (43).

4. The non-shaft-sealed energy-saving centrifugal pump with diversion function according to claim 1, characterized in that: The inner wall of the rear cover plate (5) is processed with a thread groove (52).

5. The non-shaft-sealed energy-saving centrifugal pump with diversion function according to claim 1, characterized in that: The impeller (2) comprises blades (21) and an impeller mounting seat (22), wherein the blades (21) are welded and fixed to the front end face of the impeller mounting seat (22), and a back blade (24) is welded and fixed to the rear end face of the impeller mounting seat (22).

6. The non-shaft-sealed energy-saving centrifugal pump with diversion function according to claim 5, characterized in that: The back blade (24) and the blade (21) have the same profile but are in opposite directions.

7. The non-shaft-sealed energy-saving centrifugal pump with diversion function according to any one of claims 1 to 6, characterized in that: A return pipe (56) is installed at the first return hole (15), a water inlet pipe (14) is installed at the water inlet (12), and the return pipe (56) is in communication with the water inlet pipe (14).

8. The non-shaft-sealed energy-saving centrifugal pump with diversion function according to claim 7, characterized in that: A check valve is provided in the return pipe (56).

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