Canned motor pump and fuel cell using same

Abstract

Disclosed in the present invention are a canned motor pump and a fuel cell using same. The canned motor pump comprises a pump casing assembly, an impeller and an electric motor. A casing sleeve is made of a metal material, a capacitor enclosure being provided at the position of the outer side wall of the casing sleeve close to a front end cover. An accommodating cavity is formed in the capacitor enclosure, a capacitor assembly being installed in the accommodating cavity. The top of the capacitor enclosure is provided with an opening, the opening leading to the accommodating cavity. The front end cover comprises a metal inner cover and a plastic outer cover, the plastic outer cover being located between a cover plate and the metal inner cover, and the plastic outer cover being used for covering the opening of the capacitor enclosure. Two pins are led out from the capacitor assembly, one pin being electrically connected to the casing sleeve, and the other pin being electrically connected to the metal inner cover of the front end cover. Such structural arrangement meets canned pump motor dielectric insulation requirements, ensures physical isolation and insulation between dielectrics and high-voltage components, and satisfies motor pump system requirements for the shielding of radiated emission signals, ensuring that the motor pump passes EMC test requirements.

Description

A shielded water pump and fuel cell using the same Technical Field

[0001] The invention relates to a shielded water pump and a fuel cell using the same. Background Art

[0002] The water pump used for fuel cell heat dissipation is usually a shielded pump. In order to achieve dielectric insulation, the front cover structure is usually made of insulating materials such as plastic to achieve the insulation effect between the pump head and the motor electronic control high-voltage components. The water pump designed with this solution cannot meet the requirements of shielding radiation emission signals because the front cover material cannot play a shielding role. As a result, it cannot meet the EMC test requirements of the fuel cell system for the water pump system.

[0003] Summary of the Invention

[0004] The purpose of the present invention is to provide a shielded water pump and a fuel cell used therein, so as to solve the technical problem that the existing water pump in the prior art cannot play a shielding role because the front end cover material is made of plastic, cannot meet the requirements of shielding radiation emission signals, and cannot meet the EMC test requirements of the fuel cell system for the water pump system.

[0005] The technical solution of the present invention is achieved as follows:

[0006] The present invention provides a shielded water pump, comprising a pump casing assembly, an impeller and a motor, wherein:

[0007] The motor includes a motor housing assembly, a stator assembly, a rotor assembly and a rotating shaft. The motor housing assembly includes a front cover, a housing sleeve and a rear cover. The front cover and the rear cover are respectively installed at both ends of the housing sleeve. The stator assembly is sleeved on the inner wall of the housing sleeve, and the rotor assembly is sleeved inside the stator assembly.

[0008] The pump casing assembly includes a volute and a cover plate. The cover plate is mounted on the front cover. The volute is mounted on the cover plate to form a second cavity. The volute is provided with a water inlet and a water outlet that are connected to the second cavity. The impeller is mounted in the second cavity and connected to the shaft extension end. The pump casing assembly is characterized by:

[0009] The casing sleeve is made of metal material. A capacitor box is provided on the outer wall of the casing sleeve near the front end cover. A accommodating cavity is provided in the capacitor box. A capacitor assembly is installed in the accommodating cavity. An opening is provided at the top of the capacitor box, which is connected to the accommodating cavity. The front end cover includes a metal inner cover and a plastic outer cover. The plastic outer cover is located between the cover plate and the metal inner cover. The plastic outer cover is used to cover the opening of the capacitor box. Two pins are led out from the capacitor assembly, one of which is electrically connected to the casing sleeve, and the other pin is electrically connected to the metal inner cover of the front end cover.

[0010] The capacitor assembly described above includes a Y capacitor, a circuit board and a metal shrapnel. The Y capacitor is fixedly mounted on the bottom surface of the circuit board, and the metal shrapnel is fixedly mounted on the top surface of the circuit board. The end of the metal shrapnel extends out of the opening of the capacitor box. When the front end cover is installed on the casing sleeve, the metal inner cover of the front end cover compresses the metal shrapnel and electrically connects it.

[0011] The two sides of the above-mentioned accommodating cavity are provided with mounting bosses for fixing the circuit board, the mounting bosses are provided with a first mounting hole, and the circuit board is provided with a second mounting hole corresponding to the first mounting hole. The circuit board is fixed on the mounting bosses by screws passing through the second mounting holes and connecting them with the first mounting holes.

[0012] The Y capacitor described above is welded and fixed on the circuit board, and the circuit board is fixed in the capacitor box by two screws. One end pin of the Y capacitor is electrically connected to the casing sleeve through the circuit board and the screw, and the other end pin is electrically connected to the metal inner cover of the front cover through the circuit board and the metal spring.

[0013] After installation, the metal spring is about 1mm-5mm higher than the end surface of the housing sleeve. After the front cover is installed, the metal spring is compressed, so that the metal spring and the Y capacitor are electrically connected to the metal inner cover of the front cover.

[0014] The front end cover mentioned above also includes an insulating sleeve, which is arranged at the inner edge of the metal inner cover and the capacitor box.

[0015] The motor described above also includes a shielding sleeve, which is sleeved inside the stator assembly. The rotor assembly is placed in the shielding cavity of the shielding sleeve. The shielding sleeve isolates the stator assembly from the rotor assembly, and the bottom end of the shielding sleeve is in contact with the surface of the rear end cover.

[0016] The controller is installed at the bottom of the rear end cover.

[0017] The casing sleeve is made of aluminum alloy, the metal inner cover of the front end cover is made of aluminum alloy, and the volute is made of plastic.

[0018] A fuel cell includes a stack module, a hydrogen supply system, an air supply system and a cooling system. The cooling system includes a water pump, which is characterized in that the water pump is the shielded water pump described above.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] 1. A shielded water pump, comprising a pump casing assembly, an impeller and a motor, wherein: the motor comprises a motor casing assembly, a stator assembly, a rotor assembly and a rotating shaft, the motor casing assembly comprises a front end cover, a casing sleeve and a rear end cover, the front end cover and the rear end cover are respectively mounted at both ends of the casing sleeve, the stator assembly is sleeved on the inner wall of the casing sleeve, and the rotor assembly is sleeved inside the stator assembly; the pump casing assembly comprises a volute and a cover plate, the cover plate is mounted on the front end cover, the volute is mounted on the cover plate to form a second cavity, a water inlet and a water outlet are arranged on the volute to communicate with the second cavity, the impeller is mounted inside the second cavity and connected to the shaft extension end of the rotating shaft, characterized in that: the casing sleeve is made of metal material, the machine A capacitor box is provided on the outer side wall of the shell sleeve near the front end cover, and a accommodating cavity is provided in the capacitor box. A capacitor assembly is installed in the accommodating cavity. An opening is provided at the top of the capacitor box, and the opening is connected to the accommodating cavity. The front end cover includes a metal inner cover and a plastic outer cover. The plastic outer cover is located between the cover plate and the metal inner cover. The plastic outer cover is used to cover the opening of the capacitor box. Two pins are led out from the capacitor assembly, one of which is electrically connected to the shell sleeve, and the other pin is electrically connected to the metal inner cover of the front end cover. This structural arrangement meets the dielectric insulation requirements of the shielded water pump, ensuring physical isolation and insulation between the medium and the high-voltage components; at the same time, it realizes the radiation emission signal shielding requirements of the water pump system, ensuring that the water pump can pass the EMC test requirements.

[0021] 2. Other advantages of the present invention are described in detail in the embodiment section of the specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] FIG1 is a perspective view of the present invention;

[0023] FIG2 is an exploded view of the present invention;

[0024] FIG3 is a partial exploded view of the present invention;

[0025] FIG4 is a schematic diagram of a partial structure provided by the present invention;

[0026] FIG5 is a front view of the present invention;

[0027] FIG6 is a cross-sectional view taken along line AA in FIG5 ;

[0028] FIG7 is a partial enlarged view of B in FIG6 . DETAILED DESCRIPTION

[0029] To further clarify the objectives, technical solutions, and advantages of the embodiments of the present invention, the following will provide a clear and complete description of the technical solutions in the embodiments of the present invention, in conjunction with the accompanying drawings. It should be understood that the described embodiments are only a portion of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are intended to fall within the scope of protection of the present invention.

[0030] Example 1:

[0031] As shown in Figures 1 to 7, this embodiment provides a shielded water pump, including a pump casing assembly 1, an impeller 2, and a motor 3, wherein:

[0032] The motor 3 includes a motor housing assembly 31, a stator assembly 32, a rotor assembly 33, and a rotating shaft 34. The motor housing assembly 31 includes a front cover 311, a housing sleeve 312, and a rear cover 313. The front cover 311 and the rear cover 313 are respectively mounted on both ends of the housing sleeve 312. The stator assembly 32 is sleeved on the inner wall of the housing sleeve 312, and the rotor assembly 33 is sleeved inside the stator assembly 32.

[0033] The pump casing assembly 1 includes a volute 11 and a cover plate 12. The cover plate 12 is mounted on the front end cover 311. The volute 11 is mounted on the cover plate 12 to form a second cavity 10. The volute 11 is provided with a water inlet 13 and a water outlet 14 that communicate with the second cavity 10. The impeller 2 is mounted in the second cavity 10 and connected to the shaft extension end of the rotating shaft 34. The pump casing assembly 1 is characterized by:

[0034] The casing sleeve 312 is made of metal material. A capacitor box 4 is provided on the outer wall of the casing sleeve 312 near the front end cover. A accommodating cavity 41 is provided in the capacitor box 4. A capacitor assembly 5 is installed in the accommodating cavity 41. An opening 42 is provided at the top of the capacitor box 4. The opening 42 is connected to the accommodating cavity 41. The front end cover 311 includes a metal inner cover 311b and a plastic outer cover 311a. The plastic outer cover 311a is located between the cover plate 12 and the metal inner cover 311b. The plastic outer cover 311a is used to cover the opening 42 of the capacitor box 4. Two pins are led out from the capacitor assembly 5, one of which is electrically connected to the casing sleeve 312, and the other pin is electrically connected to the metal inner cover 311b of the front end cover 311. This structural arrangement meets the dielectric insulation requirements of the shielded water pump, ensuring physical isolation and insulation between the dielectric and the high-voltage components; at the same time, it realizes the radiation emission signal shielding requirements of the water pump system, ensuring that the water pump can pass the EMC test requirements.

[0035] The above-mentioned capacitor assembly 5 includes a Y capacitor 51, a circuit board 52 and a metal spring 53. The Y capacitor 51 is fixedly mounted on the bottom surface of the circuit board 52, and the metal spring 53 is fixedly mounted on the top surface of the circuit board 52. The end of the metal spring 53 extends out of the opening 42 of the capacitor box 4. When the front end cover 311 is installed on the casing sleeve 312, the metal inner cover 311b of the front end cover 311 compresses the metal spring 53 and electrically connects it. The metal spring structure is arranged to ensure electrical connection with the metal inner cover 311b of the front end cover 311, ensuring that the water pump can pass the EMC test requirements.

[0036] Mounting bosses 411 for fixing the circuit board 52 are provided on both sides of the above-mentioned accommodating cavity 41. A first mounting hole 412 is provided on the mounting boss 411, and a second mounting hole 521 corresponding to the first mounting hole 412 is provided on the circuit board 52. The circuit board 52 is fixed on the mounting boss 411 by passing the screw 100 through the second mounting hole 521 and connecting it with the first mounting hole 412. The mounting structure is simple.

[0037] The above-mentioned Y capacitor 51 is welded and fixed on the circuit board 52, and the circuit board 52 is fixed in the capacitor box 4 by two screws 100. One end pin of the Y capacitor 51 is electrically connected to the casing sleeve 312 through the circuit board 52 and the screw 100, and the other end pin is electrically connected to the metal inner cover 311b of the front cover 311 through the circuit board 52 and the metal spring 53.

[0038] After installation, the metal spring 53 is about 1mm-5mm higher than the end surface of the casing sleeve 312. After the front cover 311 is installed, the metal spring 53 is compressed, so that the metal spring 53 and the Y capacitor 51 are electrically connected to the metal inner cover 311b of the front cover 311, ensuring that the water pump can pass the EMC test requirements.

[0039] The front end cover 311 further includes an insulating sleeve 311 c , which is arranged at the inner edge of the metal inner cover 311 b and the capacitor box 4 , and has good insulation effect and reasonable structural arrangement.

[0040] The above-mentioned motor 3 also includes a shielding sleeve 35, which is sleeved inside the stator assembly 32, and the rotor assembly 33 is placed in the shielding cavity 350 of the shielding sleeve 35. The shielding sleeve 35 isolates the stator assembly 32 from the rotor assembly 33, and the bottom end of the shielding sleeve 35 is in contact with the surface of the rear end cover 313.

[0041] The controller 6 is installed at the bottom of the rear end cover 313 .

[0042] The above-mentioned casing sleeve 312 is made of aluminum alloy material, the metal inner cover 311b of the front end cover 311 is made of aluminum alloy material, and the volute 11 is made of plastic, which meets the dielectric insulation requirements of the shielded water pump and ensures the physical isolation and insulation of the medium and high-voltage components; at the same time, it realizes the radiation emission signal shielding requirements of the water pump system and ensures that the water pump can pass the EMC test requirements.

[0043] Example 2:

[0044] A fuel cell includes a stack module, a hydrogen supply system, an air supply system and a cooling system. The cooling system includes a water pump, characterized in that the water pump is the shielded water pump described in Example 1.

[0045] The above embodiments are preferred implementations of the present invention, but the implementations of the present invention are not limited thereto. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention are equivalent replacement methods and are included in the scope of protection of the present invention.

Claims

1. A shielded water pump, comprising a pump casing assembly (1), an impeller (2) and a motor (3), wherein: The motor (3) includes a motor housing assembly (31), a stator assembly (32), a rotor assembly (33) and a rotating shaft (34); the motor housing assembly (31) includes a front end cover (311), a housing sleeve (312) and a rear end cover (313); the front end cover (311) and the rear end cover (313) are respectively mounted on two ends of the housing sleeve (312); the stator assembly (32) is sleeved on the inner wall of the housing sleeve (312); and the rotor assembly (33) is sleeved inside the stator assembly (32); The pump casing assembly (1) includes a volute (11) and a cover plate (12), the cover plate (12) being mounted on the front end cover (311), the volute (11) being mounted on the cover plate (12) to form a second cavity (10), the volute (11) being provided with a water inlet (13) and a water outlet (14) communicating with the second cavity (10), the impeller (2) being mounted in the second cavity (10) and connected to the shaft extension end of the rotating shaft (34), and characterized in that: The casing sleeve (312) is made of metal material. A capacitor box (4) is provided on the outer side wall of the casing sleeve (312) near the front end cover. A receiving cavity (41) is provided in the capacitor box (4). A capacitor assembly (5) is installed in the receiving cavity (41). An opening (42) is provided at the top of the capacitor box (4). The opening (42) is communicated with the receiving cavity (41). The front end cover (311) includes a metal inner cover (311b) and a plastic outer cover (311a). The plastic outer cover (311a) is located between the cover plate (12) and the metal inner cover (311b). The plastic outer cover (311a) is used to cover the opening (42) of the capacitor box (4). Two pins are led out from the capacitor assembly (5), one of which is electrically connected to the casing sleeve (312) and the other is electrically connected to the metal inner cover (311b) of the front end cover (311).

2. A shielded water pump according to claim 1, characterized in that: The capacitor assembly (5) comprises a Y capacitor (51), a circuit board (52) and a metal spring (53). The Y capacitor (51) is fixedly mounted on the bottom surface of the circuit board (52), and the metal spring (53) is fixedly mounted on the top surface of the circuit board (52). The end of the metal spring (53) extends out of the opening (42) of the capacitor box (4). When the front end cover (311) is mounted on the housing sleeve (312), the metal inner cover (311b) of the front end cover (311) compresses the metal spring (53) and electrically connects and conducts.

3. A shielded water pump according to claim 2, characterized in that: Mounting bosses (411) for fixing the circuit board (52) are provided on both sides of the accommodating cavity (41), a first mounting hole (412) is provided on the mounting bosses (411), and a second mounting hole (521) corresponding to the first mounting hole (412) is provided on the circuit board (52), and the circuit board (52) is fixed on the mounting bosses (411) by screws (100) passing through the second mounting holes (521) and connecting with the first mounting holes (412).

4. A shielded water pump according to claim 3, characterized in that: The Y capacitor (51) is welded and fixed on the circuit board (52), and the circuit board (52) is fixed in the capacitor box (4) by two screws (100). One end pin of the Y capacitor (51) is electrically connected to the casing sleeve (312) through the circuit board (52) and the screw (100), and the other end pin is electrically connected to the metal inner cover (311b) of the front cover (311) through the circuit board (52) and the metal spring (53).

5. A shielded water pump according to claim 4, characterized in that: After the metal spring (53) is installed, it is higher than the end surface of the housing sleeve (312) by about 1 mm to 5 mm. After the front end cover (311) is installed, the metal spring (53) is compressed, so that the metal spring (53) and the Y capacitor (51) are electrically connected to the metal inner cover (311b) of the front end cover (311).

6. A shielded water pump according to claim 5, characterized in that: The front end cover (311) further includes an insulating sleeve (311c), which is arranged at the inner edge of the metal inner cover (311b) and the capacitor box (4).

7. A shielded water pump according to claim 1 or 2 or 3 or 4 or 5 or 6, characterized in that: The motor (3) further comprises a shielding sleeve (35), the shielding sleeve (35) being sleeved inside the stator assembly (32), the rotor assembly (33) being placed inside a shielding cavity (350) of the shielding sleeve (35), the shielding sleeve (35) isolating the stator assembly (32) from the rotor assembly (33), and the bottom end of the shielding sleeve (35) is in contact with the surface of the rear end cover (313).

8. The shielded water pump according to claim 7, characterized in that: The controller (6) is installed at the bottom of the rear end cover (313).

9. The shielded water pump according to claim 8, characterized in that: The casing sleeve (312) is made of aluminum alloy material, the metal inner cover (311b) of the front end cover (311) is made of aluminum alloy material, and the volute (11) is made of plastic.

10. A fuel cell comprising a stack module, a hydrogen supply system, an air supply system, and a cooling system, wherein the cooling system comprises a water pump, and wherein: The water pump is a shielded water pump according to any one of claims 1 to 9.

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