Shield pump

Abstract

The invention provides a shield pump. The shield pump comprises a pump head; the shielding sleeve is matched with the pump head, and a main cavity is defined by the shielding sleeve and the pump head; the stator structure comprises a stator body and an injection molding layer, the injection molding layer wraps at least part of the stator body, and a rotor mounting hole penetrating through the stator structure in the preset direction is formed in the stator structure; the rotor structure is mounted in the rotor mounting hole, and the stator structure and the rotor structure are isolated by the shielding sleeve; the impeller is arranged in the main cavity, and the impeller is connected with the rotor structure; the control box is fixedly connected with the stator structure in the preset direction, and an electrical element in the control box is electrically connected with the stator body through a connecting terminal; and the first sealing element is arranged between the stator structure and the control box, and the first sealing element is used for sealing and isolating the connecting terminal. According to the embodiment of the shield pump, the technical problem that the fault rate of a shield pump in the related technology is high is solved.

Description

Technical Field

[0001] The present invention relates to the field of pumps, and in particular to a shielded pump. Background Art

[0002] Pumps are widely used in various fields of people's daily production operations. Among them, shielded pumps have excellent sealing properties due to their non-dynamic sealing structure. They are widely used in conveying corrosive, flammable, explosive, highly toxic, radioactive and precious liquids. They are also suitable for special occasions such as high temperature, high pressure and low temperature.

[0003] However, the applicant has found that the canned motor pumps in the related art have a high failure rate during use, especially when used in heating equipment such as floor heating and heat pumps in winter, the probability of failure is greater and maintenance operations are often required.

[0004] It can be seen that the canned motor pump in the related art has technical problems of high failure rate and poor reliability. No effective solution has been proposed so far. Summary of the invention

[0005] The main purpose of the present invention is to provide a canned pump to solve the technical problem of high failure rate of canned pumps in the related art.

[0006] In order to achieve the above-mentioned purpose, the present invention provides a shielded pump, which includes: a pump head, the pump head includes a first pump port and a second pump port; a shielding sleeve, the shielding sleeve cooperates with the pump head, and a main chamber is formed between the shielding sleeve and the pump head, and the first pump port and the second pump port are both connected to the main chamber; a stator structure, the stator structure includes a stator body and an injection molding layer, the injection molding layer wraps at least a part of the stator body, and the stator structure is provided with a rotor mounting hole that penetrates the stator structure along a preset direction; a rotor structure, the rotor structure is installed in the rotor mounting hole, the shielding sleeve isolates the stator structure from the rotor structure, and the rotor structure is located in the main chamber; an impeller, the impeller is arranged in the main chamber, the impeller is connected to the rotor structure, and the rotor structure drives the impeller to rotate; a control box, along the preset direction, the control box is located at one end of the stator structure, the control box is fixedly connected to the stator structure, and the electrical components in the control box are electrically connected to the stator body through the connecting terminal; a first seal, the first seal is arranged between the stator structure and the control box, and the first seal seals and isolates the connecting terminal.

[0007] Furthermore, there are multiple connecting terminals, and the multiple connecting terminals are arranged at intervals, wherein: the multiple connecting terminals are all located in the area surrounded by the first seal; or, there are multiple first seals, and the multiple first seals are arranged one-to-one corresponding to the multiple connecting terminals, and each connecting terminal is located in the area surrounded by the corresponding first seal.

[0008] Furthermore, the first seal includes a seal body, which is an annular structure and extends along the matching edges of the stator structure and the control box. The seal body is provided with a terminal avoidance hole, and the connecting terminal is inserted into the terminal avoidance hole.

[0009] Furthermore, there are a plurality of connection terminals, which are arranged at intervals, and there are a plurality of terminal avoidance holes, which are arranged in a one-to-one correspondence with the plurality of connection terminals.

[0010] Furthermore, the shielded pump comprises: a second seal, which is arranged between the shielding sleeve and the stator structure, and prevents liquid or gas from entering the rotor mounting hole through the gap between the shielding sleeve and the stator structure.

[0011] Furthermore, the stator body is exposed at a position corresponding to the inner wall surface of the rotor mounting hole.

[0012] Furthermore, a sealing ring installation groove is provided at the inner corner of one end of the rotor mounting hole close to the pump head. The sealing ring installation groove is an annular incision arranged around the rotor mounting hole, and the second sealing member is arranged in the sealing ring installation groove; the shielding sleeve includes a barrel body and a flange portion located at the barrel mouth, the flange portion is folded toward the outside of the barrel body, and both the barrel body and the flange portion are in extrusion contact with the second sealing member.

[0013] Furthermore, the connecting terminal includes: a first plug-in sheet, the first plug-in sheet is electrically connected to the stator winding in the stator structure, and a portion of the first plug-in sheet is embedded in the injection molding layer; a second plug-in sheet, the second plug-in sheet is fixedly arranged in the control box, and the second plug-in sheet is electrically connected to the electrical component; wherein the first plug-in sheet and the second plug-in sheet are both metal sheets, and the first plug-in sheet and the second plug-in sheet are plug-fitted.

[0014] Furthermore, a plug-in installation portion is provided in the control box, and the plug-in installation portion has a plug-in installation slot, which connects the inside and outside of the control box, and the second plug-in is inserted in the plug-in installation slot, wherein: the second plug-in has a first snap-fitting portion, and the plug-in installation slot is provided with a second snap-fitting portion, and the first snap-fitting portion is snap-fitted with the second snap-fitting portion to prevent the second plug-in from escaping from the plug-in installation slot; and / or, the second plug-in has a first clamping portion and a second clamping portion, and when the first plug-in is inserted between the first clamping portion and the second clamping portion, the first clamping portion and the second clamping portion clamp the first plug-in; wherein, when the first plug-in is inserted between the first clamping portion and the second clamping portion, the first clamping portion and the second clamping portion are both in compression contact with the inner wall of the plug-in installation slot.

[0015] Further, the stator structure has a first guide matching portion, and the control box has a second guide matching portion. When the stator structure and the control box approach or move away from each other, the first guide matching portion and the second guide matching portion guide the relative movement of the stator structure and the control box so that the first plug-in piece and the second plug-in piece are matched or separated; and / or, the shielded pump includes a first connecting member, at least a portion of which is embedded in the injection molding layer, and the shielded pump also includes a second connecting member, which matches with the first connecting member to connect the stator structure to the control box through the first connecting member and the second connecting member.

[0016] A shielded pump using the technical solution of the present invention comprises: a pump head, the pump head comprises a first pump port and a second pump port; a shielding sleeve, the shielding sleeve cooperates with the pump head, a main chamber is formed between the shielding sleeve and the pump head, and the first pump port and the second pump port are both connected to the main chamber; a stator structure, the stator structure comprises a stator body and an injection molding layer, the injection molding layer wraps at least a part of the stator body, and the stator structure is provided with a rotor mounting hole that penetrates the stator structure along a preset direction; a rotor structure, the rotor structure is installed in the rotor mounting hole, the shielding sleeve isolates the stator structure from the rotor structure, and the rotor structure is located in the main chamber; an impeller, the impeller is arranged in the main chamber, the impeller is connected to the rotor structure, and the rotor structure drives the impeller to rotate; a control box, the control box is located at one end of the stator structure along a preset direction, the control box is fixedly connected to the stator structure, and the electrical components in the control box are electrically connected to the stator body through the connecting terminals; a first seal, the first seal is arranged between the stator structure and the control box, and the first seal seals and isolates the connecting terminals. The shielded pump of the embodiment of the present invention wraps at least part of the stator body through the injection molding layer, effectively improving the moisture resistance of the stator structure and reducing the risk of winding burning due to contact with condensed water. Based on the structure of the shielded pump, the applicant found that water or air in the environment around the shielded pump may enter the connection terminal through the gap between the stator structure and the control box, or finally enter the connection terminal through the gap between the stator structure and the shielding sleeve. When the temperature difference between the inside and outside of the pump is large, the water vapor in the air is easy to form condensed water. When the water or condensed water entering the external environment enters the connection terminal, it is easy to cause a short circuit failure of the shielded pump. The shielded pump of the embodiment of the present application is also designed with a first seal, which seals and isolates the connection terminal, so that the condensed water generated by the water or air in the external environment of the shielded pump cannot enter the connection terminal, thereby avoiding the situation where the shielded pump has a short circuit failure due to water entering the connection terminal. Therefore, both the stator structure and the connection terminal can effectively prevent condensed water from entering, thereby reducing the risk of failure, improving the safety and reliability of the shielded pump operation, and solving the technical problem of the high failure rate of the shielded pump in the related art. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1 It is a schematic diagram of an embodiment of a canned motor pump of the present invention at a first angle;

[0019] Figure 2 It is a schematic diagram of an embodiment of a canned motor pump of the present invention at a second angle;

[0020] Figure 3 It is a schematic cross-sectional structural diagram of an embodiment of a canned motor pump of the present invention;

[0021] Figure 4 for Figure 3 A partial enlarged schematic diagram of

[0022] Figure 5 A schematic diagram of a half-section structure of an embodiment of a canned motor pump of the present invention;

[0023] Figure 6 for Figure 5 A partial enlarged schematic diagram of

[0024] Figure 7 It is a structural schematic diagram of a first sealing member of an embodiment of a canned motor pump of the present invention;

[0025] Figure 8 It is a schematic cross-sectional structure diagram of a shielding sleeve of an embodiment of a shielded pump of the present invention;

[0026] Fig. 9 It is a partial structural schematic diagram of an embodiment of a canned motor pump of the present invention (the injection molding layer is removed in the figure);

[0027] Fig.10 It is a partial structural schematic diagram of an embodiment of the canned motor pump of the present invention (the pump head, injection molding layer, stator core, and stator winding are removed in the figure);

[0028] Fig.11 It is a structural schematic diagram of a control box of an embodiment of a canned motor pump of the present invention;

[0029] Fig.12 It is a schematic diagram of the structure of the control box of the embodiment of the canned motor pump of the present invention after the box cover is removed;

[0030] Fig.13 It is a schematic diagram of the structure inside the control box of an embodiment of the canned motor pump of the present invention;

[0031] Fig.14 A schematic structural diagram of a connection terminal of an embodiment of a canned motor pump of the present invention;

[0032] Fig.15 It is a schematic structural diagram of a second insert of another embodiment of the canned motor pump of the present invention.

[0033] The above drawings include the following reference numerals:

[0034] 1. Pump head; 11. First pump port; 12. Second pump port; 13. Main chamber; 14. Reinforcement structure; 2. Shielding sleeve; 21. Barrel body; 22. Flanging; 23. Shielding cover; 3. Stator structure; 31. Stator body; 311. Stator core; 312. Insulation frame; 313. Terminal bracket; 32. Injection molding layer; 33. First guide matching part; 4. Rotor structure; 5. Impeller; 6. Control box; 61. Electrical component; 611. First target component; 612. Thermal conductive material; 613. Metal heat sink; 614. Insulation sheet; 62. Box body; 63. Box Cover; 64, plug-in installation portion; 65, second guide matching portion; 7, first sealing member; 71, sealing member body; 72, terminal avoidance hole; 73, connector avoidance hole; 81, second sealing member; 82, third sealing member; 83, fourth sealing member; 100, connecting terminal; 101, first plug-in member; 102, second plug-in member; 103, grounding terminal; 1021, first snap-fitting portion; 1022, first clamping portion; 1023, second clamping portion; 1024, limiting portion; 1025, plug-in portion; 201, first connector; 202, second connector mounting hole. DETAILED DESCRIPTION

[0035] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0036] As described in the background technology section, the failure rate of the shielded pump in the related art is high during use, especially when used in heating equipment such as floor heating and heat pumps in winter, the probability of failure is greater, and maintenance operations are often required. The applicant has found through research that when the shielded pump is used in an environment with a large temperature difference, some air will enter the shielded pump due to poor sealing, and then the water vapor in the air will easily form condensed water inside the shielded pump. When the condensed water contacts the stator winding, it is easy to cause the stator winding to burn. More importantly, when the condensed water enters the connection terminal between the stator and the control box, it will cause a short circuit, causing a short circuit failure of the shielded pump.

[0037] To solve the technical problem of high failure rate of canned motor pumps, please refer to Figures 1 to 15The present invention provides a shielded pump, which includes: a pump head 1, the pump head 1 includes a first pump port 11 and a second pump port 12; a shielding sleeve 2, the shielding sleeve 2 cooperates with the pump head 1, and a main chamber 13 is surrounded between the shielding sleeve 2 and the pump head 1, and the first pump port 11 and the second pump port 12 are both connected to the main chamber 13; a stator structure 3, the stator structure 3 includes a stator body 31 and an injection molding layer 32, the injection molding layer 32 wraps at least a part of the stator body 31, and the stator structure 3 is provided with a rotor mounting hole that runs through the stator structure 3 along a preset direction; a rotor structure 4, the rotor structure 4 is installed in the rotor mounting hole, and the shielding sleeve 2 isolates the stator structure 3 from the rotor structure 4, and the rotor structure 4 is located in the main chamber 13; the impeller 5, the impeller 5 is arranged in the main chamber 13, the impeller 5 is connected to the rotor structure 4, and the rotor structure 4 drives the impeller 5 to rotate; the control box 6, along the preset direction, the control box 6 is located at one end of the stator structure 3, the control box 6 is fixedly connected to the stator structure 3, and the electrical component 61 in the control box 6 is electrically connected to the stator body 31 through the connecting terminal 100; the first sealing member 7, the first sealing member 7 is arranged between the stator structure 3 and the control box 6, and the first sealing member 7 seals and isolates the connecting terminal 100.

[0038] The shielded pump of the embodiment of the present invention wraps at least part of the stator body 31 through the injection molding layer 32, which effectively improves the moisture resistance of the stator structure 3 and reduces the risk of winding burning due to contact with condensed water. Based on the structure of the shielded pump, the applicant found that water or air in the environment surrounding the shielded pump may enter the connection terminal 100 through the gap between the stator structure 3 and the control box 6, or finally enter the connection terminal 100 through the gap between the stator structure 3 and the shielding sleeve 2. When the temperature difference between the inside and outside of the pump is large, the water vapor in the air is easy to form condensed water. When the water or condensed water entering the external environment enters the connection terminal 100, it is easy to cause a short circuit failure of the shielded pump. The shielded pump in the embodiment of the present application is also designed with a first seal 7, which seals and isolates the connection terminal 100. Therefore, condensed water generated by water or air in the external environment of the shielded pump cannot enter the connection terminal 100, thereby avoiding short-circuit failure of the shielded pump caused by water entering the connection terminal 100. Therefore, both the stator structure 3 and the connection terminal 100 can effectively prevent condensed water from entering, thereby reducing the risk of failure, improving the safety and reliability of the shielded pump operation, and solving the technical problem of high failure rate of shielded pumps in related technologies.

[0039] Specifically, the specific form of the electrical component 61 can be various, as long as it can realize the power supply and / or control of the canned pump after being electrically connected to the stator structure 3. For example, in this embodiment, the electrical component 61 includes a main control circuit board, on which electrical components are arranged according to actual needs, and the stator body 31 of the stator structure 3 is electrically connected to realize the power supply and control of the canned pump.

[0040] The rotor structure 4 drives the impeller 5 to rotate, and then the impeller 5 drives the fluid in the main chamber 13 to flow from the first pump port 11 to the second pump port 12 .

[0041] In actual use, the fluid in the shielded pump flows into the main chamber 13 from the first pump port 11 and flows out from the second pump port 12 under the drive of the impeller 5. The rotor structure 4 works in a liquid environment and has no dynamic sealing related structure. Therefore, the sealing performance is good. It is suitable for conveying corrosive, flammable, explosive, highly toxic, radioactive and extremely precious liquids, as well as for special occasions such as high temperature, high pressure and low temperature.

[0042] Preferably, the stator structure 3 has a body structure and a connecting flange formed by injection molding, and the pump head 1 is connected to the connecting flange by fasteners, wherein the shielded pump further comprises a reinforcing structure 14, and the reinforcing structure 14 connects the above-mentioned body structure and the connecting flange, thereby improving the structural strength of the stator structure 3 and ensuring the reliability of its connection with the pump head 1. Preferably, the reinforcing structure 14 is a reinforcing rib formed by injection molding.

[0043] In a preferred embodiment, the canned pump further includes a shielding cover 23, which is disposed between the rotor structure 4 and the impeller 5. The shielding cover 23 is disposed at the opening of the shielding sleeve 2. The shielding cover 23 is provided with a relief opening, and the shaft of the rotor structure 4 is disposed through the relief opening. By providing the shielding cover 23, impurities in the working medium can be prevented from entering the rotor structure 4, thereby ensuring the reliability of the operation of the rotor structure 4.

[0044] Specifically, there are multiple connecting terminals 100, and the multiple connecting terminals 100 are arranged at intervals, wherein: the multiple connecting terminals 100 are all located in the area surrounded by the first seal 7; or, there are multiple first seals 7, and the multiple first seals 7 are arranged one-to-one with the multiple connecting terminals 100, and each connecting terminal 100 is located in the area surrounded by the corresponding first seal 7.

[0045] That is to say, in an optional embodiment, the first seal 7 surrounds the multiple connection terminals 100, thereby surrounding the multiple connection terminals 100 and placing them in the same sealed area, preventing external water or condensed water from entering these connection terminals 100 and causing a short circuit fault. In another optional embodiment, multiple first seals 7 are designed corresponding to the multiple connection terminals 100, and the multiple first seals 7 correspond to the multiple connection terminals 100 one by one, and each connection terminal 100 is surrounded by a first seal 7, so that each connection terminal 100 is sealed and isolated by the corresponding first seal 7, so that water or condensed water in the external environment will not short-circuit adjacent connection terminals 100, and even if individual first seals 7 fail, adjacent connection terminals 100 will not short-circuit, effectively improving the safety and reliability of the shielded pump operation.

[0046] In a specific embodiment, there are three connection terminals 100, which are connected one by one to the three-phase windings of the stator structure 3. The shielded pump also includes a grounding terminal 103, which is connected to the stator core 311 of the stator structure 3, and is also connected to the electrical component 61 in the control box 6 to achieve grounding of the stator core 311 and improve the safety of the shielded pump.

[0047] In this embodiment, the electrical element 61 includes a first target element 611, and the shielded pump also includes a metal heat sink 613. The surface area of ​​the metal heat sink 613 is greater than the surface area of ​​the first target element 611. The first target element 611 and the metal heat sink 613 are spaced apart, and a heat conductive material 612 (such as heat conductive silicone) is filled between the first target element 611 and the metal heat sink 613. Preferably, in order to improve electrical safety and prevent the metal components in the electrical element 61 from contacting the metal heat sink 613 and thus causing a short circuit, an insulating sheet 614 is provided between the first target element 611 and the metal heat sink 613, and a heat conductive material avoidance port is provided on the insulating sheet 614, so that the heat conductive material 612 is avoided through the heat conductive material avoidance port. In actual implementation, the first target element 611 can be any component that generates a large amount of heat and thus has a heat dissipation requirement. For example, in this embodiment, the first target element 611 is a chip.

[0048] In a preferred embodiment, the electrical component 61 includes a second target element, and an avoidance groove is provided on the inner wall of the control box 6, and a part of the second target element is located in the avoidance groove. In this way, by designing the avoidance groove on the inner wall of the control box 6, the second target element can be avoided, so as to better accommodate components with excessive protrusions, which is conducive to reducing the size of the control box 6. In actual implementation, the second target element can be any component with a higher protrusion, such as a capacitor.

[0049] Specifically, the first seal 7 includes a seal body 71, which is an annular structure and extends along the mating edges of the stator structure 3 and the control box 6. The seal body 71 is provided with a terminal avoidance hole 72, and the connecting terminal 100 is inserted into the terminal avoidance hole 72.

[0050] In this embodiment, the first seal 7 includes an annular seal body 71, which is extended along the matching edge of the stator structure 3 and the control box 6. Therefore, the seal body 71 can seal the matching gap between the stator structure 3 and the control box 6, and can prevent external water, air and dust from entering the inside of the shielded pump through the gap between the stator structure 3 and the control box 6. On this basis, in this embodiment, a terminal avoidance hole 72 is also designed on the seal body 71, and the connecting terminal 100 is arranged through the terminal avoidance hole 72. In this way, the first seal 7 can not only seal the matching gap between the stator structure 3 and the control box 6, but also seal around the connecting terminal 100, so that the connecting terminal 100 is in a separate sealed environment, and water in the external environment or water formed by condensation of air inside the shielded pump is prevented from entering the vicinity of the connecting terminal 100 to cause a short circuit fault. By designing the structure of the first seal 7 in a targeted manner, two sealing functions are realized through one sealing structure, the number of seals is reduced, and the assembly operation can be convenient. On the basis of improving the safety and reliability of the shielded pump operation, the simplicity of the shielded pump structure is guaranteed.

[0051] Specifically, there are a plurality of connection terminals 100 , which are arranged at intervals, and there are a plurality of terminal avoidance holes 72 , which are arranged in a one-to-one correspondence with the plurality of connection terminals 100 .

[0052] In this embodiment, the terminal avoidance holes 72 are designed to be multiple and correspond one to one with the multiple connection terminals 100. Therefore, each connection terminal 100 is sealed as an independent area, which can prevent water in the external environment or water formed by condensation of air inside the shielded pump from entering the vicinity of the connection terminal 100 and causing a short circuit fault. In addition, when a single sealing area fails, water can only contact a single connection terminal 100, and a short circuit fault will not occur. Without increasing the structural complexity of the shielded pump, its working reliability and safety are effectively improved.

[0053] Specifically, the shielded pump includes: a second seal 81, which is arranged between the shielding sleeve 2 and the stator structure 3, and prevents liquid or gas from entering the rotor mounting hole through the gap between the shielding sleeve 2 and the stator structure 3.

[0054] In this embodiment, a second seal 81 is additionally designed between the stator structure 3 and the shielding sleeve 2. The second seal 81 can fill the gap between the two, which can prevent external water or air from entering the rotor mounting hole through the gap between the stator structure 3 and the shielding sleeve 2, further reducing the risk of water in the external environment and condensed water in the air flowing through the rotor mounting hole to the connection terminal 100. If the second seal 81 is not provided, air enters the rotor mounting hole through the gap between the stator structure 3 and the shielding sleeve 2, and forms condensed water under the action of the temperature difference. The condensed water further flows along the gap between the stator structure 3 and the control box 6 to the connection terminal 100, which is likely to cause a short circuit at the connection terminal 100, thereby causing a failure of the shielded pump.

[0055] Specifically, the stator body 31 is exposed and disposed at a position corresponding to the inner wall surface of the rotor mounting hole.

[0056] That is to say, in this embodiment, at least part of the inner circumference of the stator body 31 is not provided with the injection molding layer 32, but is directly exposed in the rotor mounting hole, thereby reducing the loss of magnetic force and ensuring the working efficiency of the pump. Since the second sealing member 81 is provided between the shielding sleeve 2 and the stator structure 3, the air outside the shielded pump will not enter the rotor mounting hole through the gap between the shielding sleeve 2 and the stator structure 3, so that condensed water will not be formed in the rotor mounting hole, thereby effectively avoiding the rust of the part of the stator body 31 exposed in the rotor mounting hole, and effectively extending the service life of the shielded pump.

[0057] In actual implementation, since the rotor mounting hole passes through the stator structure 3, external gas may enter from both ends thereof. A corresponding number of second sealing members 81 may be provided according to the sealing conditions at both ends of the rotor mounting hole, thereby sealing the position where gas may flow in, thereby preventing condensed water from forming in the rotor mounting hole after external gas flows in.

[0058] For example, in an optional embodiment, two second seals 81 are provided, which are respectively provided at the two ends of the rotor mounting hole, so that air can be prevented from flowing in from the two ends and condensed water can be prevented from forming in the rotor mounting hole. For another example, in another optional embodiment, the matching position between the stator structure 3 and the control box 6 is sealed (for example, a sealing gasket surrounding the rotor mounting hole is provided between the two, and for another example, the gap between the two is sealed by the seal body 71 of the annular structure of the above-mentioned first seal 7), so that external gas will not enter the rotor mounting hole through the gap between the two. At this time, it is only necessary to provide the second seal 81 on the side of the rotor mounting hole close to the pump head 1.

[0059] Specifically, a sealing ring mounting groove is provided at the inner corner of one end of the rotor mounting hole close to the pump head 1. The sealing ring mounting groove is an annular incision arranged around the rotor mounting hole, and the second sealing member 81 is arranged in the sealing ring mounting groove; the shielding sleeve 2 includes a barrel body portion 21 and a flange portion 22 located at the barrel mouth position, the flange portion 22 is folded toward the outside of the barrel body portion 21, and the barrel body portion 21 and the flange portion 22 are both in extrusion contact with the second sealing member 81.

[0060] In this embodiment, the second seal 81 is arranged in the annular cutout at the end of the rotor mounting hole. After installation, the second seal 81 is extruded by the barrel portion 21 and the flange portion 22 of the shielding sleeve 2. Therefore, for the stator structure 3 and the shielding sleeve 2, the second seal 81 can play an axial and radial extrusion sealing role, effectively improving the sealing effect of the second seal 81.

[0061] In order to ensure the sealing of the shielded pump and reduce the risk of leakage or air intake, as a preferred embodiment, the shielded pump also includes a third seal 82, and the third seal 82 is arranged at the matching position of the pump head 1 and the shielding sleeve 2 to seal the matching position of the pump head 1 and the shielding sleeve 2 to prevent the water in the main chamber 13 from flowing out to the outside of the shielded pump under pressure, or the external air is sucked into the inside of the shielded pump.

[0062] Specifically, the connecting terminal 100 includes: a first plug-in piece 101, the first plug-in piece 101 is electrically connected to the stator winding in the stator structure 3, and a portion of the first plug-in piece 101 is embedded in the injection molding layer 32; a second plug-in piece 102, the second plug-in piece 102 is fixedly arranged on the control box 6, and the second plug-in piece 102 is electrically connected to the electrical component 61; wherein, the first plug-in piece 101 and the second plug-in piece 102 are both metal sheets, and the first plug-in piece 101 and the second plug-in piece 102 are plug-fitted.

[0063] A portion of the first plug 101 is embedded in the injection molding layer 32 , that is, after the first plug 101 is conductively connected to the stator winding, it is fixed to the stator structure 3 as a whole through injection molding, and the first plug 101 is fixed through the injection molding layer 32 .

[0064] In this embodiment, the canned pump includes a terminal bracket 313 , and the first plug 101 is fixed by the terminal bracket 313 . After the injection molding is completed, the terminal bracket 313 is embedded in the injection molding layer 32 .

[0065] In this embodiment, the stator body 31 includes: a stator core 311, an insulating frame 312, and a stator winding, wherein the insulating frame 312 is mounted on the stator core 311, and the enameled wire is wound on the insulating frame 312 to form the stator winding. Preferably, there are two insulating frames 312, and along a preset direction, the two insulating frames 312 are inserted on the stator core 311 from both sides, thereby forming a stable structure to support the stator winding.

[0066] Specifically, the control box 6 is provided with a plug-in installation portion 64, the plug-in installation portion 64 has a plug-in installation slot, the plug-in installation slot connects the inside and outside of the control box 6, and the second plug-in 102 is inserted in the plug-in installation slot, wherein: the second plug-in 102 has a first snap-fitting portion 1021, and the plug-in installation slot is provided with a second snap-fitting portion, and the first snap-fitting portion 1021 snaps with the second snap-fitting portion to prevent the second plug-in 102 from coming out of the plug-in installation slot; and / or, the second plug-in 102 has a first clamping portion 1022 and a second clamping portion 1023. When the first plug-in sheet 101 is inserted between the first clamping portion 1022 and the second clamping portion 1023, the first clamping portion 1022 and the second clamping portion 1023 clamp the first plug-in sheet 101; wherein, when the first plug-in sheet 101 is inserted between the first clamping portion 1022 and the second clamping portion 1023, the first clamping portion 1022 and the second clamping portion 1023 are both in compression contact with the inner wall of the plug-in sheet mounting groove.

[0067] In a specific embodiment, the second plug-in sheet 102 also has a limiting portion 1024. When the second plug-in sheet 102 is inserted into the plug-in installation slot, the limiting portion 1024 abuts against the plug-in installation portion 64 to limit the insertion depth of the second plug-in sheet 102, so that it can be conveniently and accurately installed in place. The second plug-in sheet 102 also has a plug-in portion 1025, which is used to plug and match with the electrical component 61, so that the second plug-in sheet 102 is conductively connected to the electrical component 61. In a preferred embodiment, the electrical component 61 is provided with a socket, and the plug-in portion 1025 of the second plug-in sheet 102 is inserted into the socket to achieve electrical connection. In this embodiment, the plug-in portion 1025 includes a main structure and a slot provided on the main structure, and the slot is arranged through the main structure, so that the structural rigidity of the plug-in portion 1025 is weakened, so that it has a certain elasticity, and can better contact with the inner wall of the socket when inserted into the socket, thereby improving the reliability of the electrical connection. In a specific implementation, the slot may extend to the edge of the main structure, or may be located within the range of the main structure, that is, not extend to the edge of the main structure.

[0068] Specifically, the stator structure 3 has a first guide matching portion 33, and the control box 6 has a second guide matching portion 65. When the stator structure 3 and the control box 6 approach or move away from each other, the first guide matching portion 33 and the second guide matching portion 65 guide the relative movement of the stator structure 3 and the control box 6 to make the first plug 101 and the second plug 102 match or separate; and / or, the shielded pump includes a first connecting member 201, at least part of which is embedded in the injection molding layer 32, and the shielded pump also includes a second connecting member, which matches with the first connecting member 201 to connect the stator structure 3 with the control box 6 through the first connecting member 201 and the second connecting member.

[0069] By embedding the first connector 201 in the injection molding layer 32, and then connecting the stator structure 3 to the control box 6 through the first connector 201 and the second connector, the structural strength of the connection between the stator structure 3 and the control box 6 is effectively improved, thereby ensuring the reliability of the connection between the stator structure 3 and the control box 6, and avoiding the situation where the reliability of the connection between the stator structure 3 and the control box 6 is poor due to insufficient injection molding strength of the stator structure 3. As mentioned above, the first connector 201 is embedded in the injection molding layer 32 to improve the structural strength of the connection. In actual implementation, the specific forms of the first connector 201 and the second connector can be various, as long as the stator structure 3 can be connected to the control box 6. In this embodiment, the first connector 201 is an insert nut, the second connector is a screw, and the control box 6 is provided with a second connector mounting hole 202. The screw is inserted into the second connector mounting hole 202 and connected to the insert nut, so that the stator structure is connected to the control box 6 through the fastening effect between the screw and the insert nut. In a preferred embodiment, a protrusion is provided on the side of the control box 6 facing the stator structure 3, and the position of the protrusion corresponds to the position of the insert nut. When the stator structure 3 is connected to the control box 6, the protrusion contacts the end face of the insert nut, thereby supporting the insert nut through the protrusion, so that the tightening force is applied to the protrusion and the insert nut, preventing the insert nut from being suspended and pulled out.

[0070] In an optional embodiment, the shielded pump includes a connector sealing structure, which is arranged between the stator structure 3 and the control box 6. The connector sealing structure is arranged around the first connector 201, so that the first connector 201 is placed in a closed environment to prevent water or condensed water from the external environment from flowing to the first connector 201 to cause rust and cause the connection between the stator structure 3 and the control box 6 to fail. As a preferred embodiment, a connector avoidance hole 73 is provided on the sealing body 71 of the first sealing member 7, and the first connector 201 is inserted into the connector avoidance hole 73. In this way, the first sealing member 7 can be used to achieve sealing protection of the first connector 201, effectively reducing the number of seals, thereby ensuring the simplicity of the shielded pump structure and the convenience of assembly. In actual implementation, the specific shape of the first seal 7 can be flexibly set according to actual conditions. For example, in order to design the terminal avoidance hole 72, the seal body 71 can be set wider at a position close to the connecting terminal 100. In order to design the connector avoidance hole 73, a lug can be set at a position close to the first connector 201, so that the connector avoidance hole 73 is designed on the lug. In this embodiment, in order to improve the sealing effect of the first seal 7, a strip protrusion and / or a strip groove are provided on the seal body 71 of the first seal 7, which is located on the side of the seal body 71 close to the stator structure 3. The strip protrusion and / or the strip groove are extended along the circumference of the seal body 71, and a matching structure corresponding to the strip protrusion and / or the strip groove is provided on the stator structure 3, so that the matching effect between the first seal 7 and the stator structure 3 is better, thereby improving the sealing effect of the first seal 7.

[0071] In a specific embodiment, the control box 6 includes a box body 62 and a box cover 63, and the box cover 63 is detachably connected to the box body 62, so as to facilitate the installation and maintenance of the internal electrical components 61. In order to improve the sealing performance of the control box 6 and prevent water, dust, humid air, etc. from entering the control box 6 and affecting the operation of the electrical components 61, the canned pump of this embodiment also includes a fourth sealing member 83, which is arranged between the box body 62 and the box cover 63, so as to seal the gap between the two.

[0072] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0073] The shielded pump of the embodiment of the present invention wraps at least part of the stator body 31 through the injection molding layer 32, which effectively improves the moisture resistance of the stator structure 3 and reduces the risk of winding burning due to contact with condensed water. Based on the structure of the shielded pump, the applicant found that water or air in the environment surrounding the shielded pump may enter the connection terminal 100 through the gap between the stator structure 3 and the control box 6, or finally enter the connection terminal 100 through the gap between the stator structure 3 and the shielding sleeve 2. When the temperature difference between the inside and outside of the pump is large, the water vapor in the air is easy to form condensed water. When the water or condensed water entering the external environment enters the connection terminal 100, it is easy to cause a short circuit failure of the shielded pump. The shielded pump in the embodiment of the present application is also designed with a first seal 7, which seals and isolates the connection terminal 100. Therefore, condensed water generated by water or air in the external environment of the shielded pump cannot enter the connection terminal 100, thereby avoiding short-circuit failure of the shielded pump caused by water entering the connection terminal 100. Therefore, both the stator structure 3 and the connection terminal 100 can effectively prevent condensed water from entering, thereby reducing the risk of failure, improving the safety and reliability of the shielded pump operation, and solving the technical problem of high failure rate of shielded pumps in related technologies.

[0074] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0075] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0076] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0077] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A canned motor pump, characterized in that: include: A pump head (1), the pump head (1) comprising a first pump port (11) and a second pump port (12); A shielding sleeve (2), the shielding sleeve (2) cooperates with the pump head (1), a main chamber (13) is enclosed between the shielding sleeve (2) and the pump head (1), and the first pump port (11) and the second pump port (12) are both connected to the main chamber (13); A stator structure (3), the stator structure (3) comprising a stator body (31) and an injection molding layer (32), the injection molding layer (32) wrapping at least a portion of the stator body (31), the stator structure (3) being provided with a rotor mounting hole which passes through the stator structure (3) along a preset direction; a rotor structure (4), the rotor structure (4) being mounted in the rotor mounting hole, the shielding sleeve (2) isolating the stator structure (3) from the rotor structure (4), and the rotor structure (4) being located in the main chamber (13); An impeller (5), the impeller (5) being disposed in the main chamber (13), the impeller (5) being connected to the rotor structure (4), and the rotor structure (4) driving the impeller (5) to rotate; A control box (6), wherein the control box (6) is located at one end of the stator structure (3) along the preset direction, the control box (6) is fixedly connected to the stator structure (3), and the electrical component (61) in the control box (6) is electrically connected to the stator body (31) via a connecting terminal (100); A first sealing member (7), wherein the first sealing member (7) is arranged between the stator structure (3) and the control box (6), and the first sealing member (7) seals and isolates the connection terminal (100).

2. The canned motor pump according to claim 1, characterized in that: There are a plurality of connection terminals (100), and the plurality of connection terminals (100) are arranged at intervals, wherein: The plurality of connecting terminals (100) are all located within the area enclosed by the first seal (7); or, there are a plurality of first seals (7), and the plurality of first seals (7) are arranged in one-to-one correspondence with the plurality of connecting terminals (100), and each connecting terminal (100) is located within the area enclosed by the corresponding first seal (7).

3. The canned motor pump according to claim 1, characterized in that: The first seal (7) comprises a seal body (71), the seal body (71) is an annular structure, the seal body (71) is extended along the matching edges of the stator structure (3) and the control box (6), the seal body (71) is provided with a terminal avoidance hole (72), and the connecting terminal (100) is inserted into the terminal avoidance hole (72).

4. The canned motor pump according to claim 3, characterized in that: There are a plurality of connection terminals (100), and the plurality of connection terminals (100) are arranged at intervals; there are a plurality of terminal avoidance holes (72), and the plurality of terminal avoidance holes (72) are arranged in a one-to-one correspondence with the plurality of connection terminals (100).

5. The canned motor pump according to claim 1, characterized in that: The canned motor pump comprises: A second sealing member (81), wherein the second sealing member (81) is arranged between the shielding sleeve (2) and the stator structure (3), and the second sealing member (81) prevents liquid or gas from entering the rotor mounting hole through a gap between the shielding sleeve (2) and the stator structure (3).

6. The canned motor pump according to claim 5, characterized in that: The stator body (31) is exposed and arranged at a position corresponding to the inner wall surface of the rotor installation hole.

7. The canned motor pump according to claim 5, characterized in that: A sealing ring installation groove is provided at the inner corner of one end of the rotor installation hole close to the pump head (1); the sealing ring installation groove is an annular incision arranged around the rotor installation hole; the second sealing member (81) is arranged in the sealing ring installation groove; the shielding sleeve (2) comprises a barrel body (21) and a flange portion (22) located at the barrel mouth; the flange portion (22) is folded toward the outside of the barrel body (21); the barrel body (21) and the flange portion (22) are both in extrusion contact with the second sealing member (81).

8. The canned motor pump according to any one of claims 1 to 7, characterized in that: The connecting terminal (100) comprises: A first plug-in sheet (101), the first plug-in sheet (101) being electrically connected to the stator winding in the stator structure (3), and a portion of the first plug-in sheet (101) being embedded in the injection molding layer (32); A second plug-in piece (102), the second plug-in piece (102) being fixedly disposed on the control box (6), and the second plug-in piece (102) being electrically connected to the electrical element (61); Wherein, the first plug-in sheet (101) and the second plug-in sheet (102) are both metal sheets, and the first plug-in sheet (101) and the second plug-in sheet (102) are plug-fitted.

9. The canned motor pump according to claim 8, characterized in that: The control box (6) is provided with a plug-in installation portion (64), the plug-in installation portion (64) having a plug-in installation slot, the plug-in installation slot connects the inside and the outside of the control box (6), and the second plug-in (102) is inserted into the plug-in installation slot, wherein: The second plug sheet (102) has a first snap-fitting portion (1021), a second snap-fitting portion is provided in the plug sheet installation slot, the first snap-fitting portion (1021) is snap-fitted with the second snap-fitting portion to prevent the second plug sheet (102) from falling out of the plug sheet installation slot; and / or, The second plug sheet (102) has a first clamping portion (1022) and a second clamping portion (1023); when the first plug sheet (101) is inserted between the first clamping portion (1022) and the second clamping portion (1023), the first clamping portion (1022) and the second clamping portion (1023) clamp the first plug sheet (101); wherein, when the first plug sheet (101) is inserted between the first clamping portion (1022) and the second clamping portion (1023), the first clamping portion (1022) and the second clamping portion (1023) are both in compression contact with the inner wall of the plug sheet installation slot.

10. The canned motor pump according to claim 8, characterized in that: The stator structure (3) has a first guide fitting portion (33), and the control box (6) has a second guide fitting portion (65), and when the stator structure (3) and the control box (6) approach or move away from each other, the first guide fitting portion (33) and the second guide fitting portion (65) guide the relative movement of the stator structure (3) and the control box (6) so as to enable the first plug-in piece (101) and the second plug-in piece (102) to fit or separate; and / or, The shielded pump comprises a first connecting member (201), at least a portion of which is embedded in the injection molding layer (32), and the shielded pump further comprises a second connecting member, which cooperates with the first connecting member (201) to connect the stator structure (3) to the control box (6) via the first connecting member (201) and the second connecting member.

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