Shield pump and fuel cell using same

Abstract

The utility model discloses a shield pump and a fuel cell using the same. The shield pump comprises a pump shell assembly, a motor and a controller, the rear end cover comprises an annular outer side plate and an inner side plate, the inner side plate is installed in the middle of the annular outer side plate, the inner side plate is a metal plate, the annular outer side plate is a plastic plate, a rear bearing seat is arranged on the top end face of the inner side plate, a front bearing seat is arranged on the bottom end face of the front end cover, and a rear positioning spigot is arranged on the outer side edge of the rear bearing seat. The outer side edge of the front bearing seat is provided with a front positioning spigot, the two ends of the shielding sleeve are arranged on the front positioning spigot and the rear positioning spigot in a sleeving mode, the sleeve and the controller are installed on the two end faces of the annular outer side plate respectively, the annular outer side plate is located between the sleeve and the controller, and heat generated by the stator assembly is prevented from flowing into the controller. The upper limit of the use environment temperature of the product is greatly improved; in addition, the annular outer side plate made of plastic blocks conduction between the internal circulation fluid and the sleeve, the requirement for insulation between the internal circulation fluid and the controller and between the internal circulation fluid and the sleeve is met, the product structure is indirectly simplified, and the product cost is reduced.

Description

Technical Field

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

[0002] The shielded pump used in the fuel cell module system is one of the key parts, especially in the design and application of the shielded structure for the fuel cell system. The liquid area of ​​the shielded pump must be insulated from the metal shell, and the working environment temperature requirements of the shielded pump are getting higher and higher. The heat dissipation of the motor controller has become a key issue. As the power of the fuel cell system becomes higher and higher, the power of the shielded pump used for cooling is also getting higher and higher. In order to take into account the higher and higher working temperature environment of the controller, the industry generally uses the inner circulation fluid of the shielded pump to cool the controller. At the same time, in order to ensure the insulation requirements, various insulating partitions are added when the controller heatsinks and exchanges heat with the inner circulation fluid. The thermal conductivity of the multi-layer insulation board is low, which is not conducive to heat dissipation. The contradiction between insulation and heat dissipation is becoming more and more serious. Summary of the invention

[0003] The purpose of the utility model is to provide a canned pump and a fuel cell using the same, so as to solve the technical problem that the internal circulation fluid of the canned pump is used to dissipate heat and cool the controller in the prior art, and at the same time, in order to ensure the insulation requirements, various insulating partitions are added when the controller dissipates heat and exchanges heat with the internal circulation fluid. The thermal conductivity of the multi-layer insulating plate is low, which is not conducive to heat dissipation, and the contradiction between insulation and heat dissipation is becoming increasingly serious.

[0004] The technical solution of the utility model is achieved in this way:

[0005] The utility model provides a shielded pump, including a pump housing assembly, a motor and a controller;

[0006] Wherein: the motor comprises a rotating shaft, a sleeve, a stator assembly, a rotor assembly, a front cover, a rear cover and a shielding sleeve, the front cover and the rear cover are respectively mounted on both ends of the sleeve, the stator assembly is sleeved on the inner wall of the sleeve, the shielding sleeve 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 controller is mounted at the bottom of the rear cover;

[0007] The pump casing assembly includes a volute, an impeller and a cover plate; the cover plate is mounted on the front cover, the volute is mounted on the cover plate to form a cavity, a water inlet and a water outlet are arranged on the volute to communicate with the cavity, the impeller is mounted in the cavity and connected to the shaft extension end of the rotating shaft;

[0008] It is characterized in that: the rear end cover includes an annular outer plate and an inner plate, the inner plate is installed in the middle of the annular outer plate, the inner plate is a metal plate, and the annular outer plate is a plastic plate. The top end surface of the inner plate is provided with a rear bearing seat for installing the rear bearing, and the bottom end surface of the front end cover is provided with a front bearing seat for installing the front bearing. The outer edge of the rear bearing seat is provided with a rear positioning stop, and the outer edge of the front bearing seat is provided with a front positioning stop. The two ends of the shielding sleeve are sleeved on the front positioning stop and the rear positioning stop, and the sleeve and the controller are respectively installed on the two end surfaces of the annular outer plate.

[0009] The inner side plate is provided with a through hole for the lead wire of the stator assembly to pass through, and the lead wire of the stator assembly passes through the through hole and extends into the controller.

[0010] The inner side of the annular outer plate is provided with an annular groove, and the inner plate is embedded in the annular groove.

[0011] The inner plate mentioned above is made of 316L stainless steel or aluminum alloy; the annular outer plate is made of PA66+glass fiber plastic.

[0012] The controller described above includes a control box, a circuit board, several IGBT modules and capacitors. The circuit board is installed inside the control box, and the several IGBT modules and capacitors are respectively installed on the two end surfaces of the circuit board. The several IGBT modules are closely attached to the end surface of the inner plate.

[0013] A ceramic insulating sheet is provided between the aforementioned IGBT modules and the inner plate.

[0014] The bottom of the control box described above is also provided with a bottom plate cover, and a thermal conductive silicone pad is provided between the capacitor and the bottom plate.

[0015] The above-mentioned sleeve, annular outer plate, control box and circuit board are respectively provided with corresponding first mounting holes, second mounting holes, third mounting holes and fourth mounting holes, which are fixed together by screws passing through the fourth mounting holes, the third mounting holes, the second mounting holes and locking them with the first mounting holes.

[0016] A fuel cell includes a stack module, a hydrogen supply system, an air supply system and a cooling system. The cooling system includes a shielded pump, and the shielded pump is characterized in that the shielded pump is the shielded pump described above.

[0017] Compared with the prior art, the utility model has the following advantages:

[0018] 1. The shielded pump of the utility model comprises a pump casing assembly, a motor and a controller; wherein: the motor comprises a rotating shaft, a sleeve, a stator assembly, a rotor assembly, a front cover, a rear cover and a shielding sleeve, the front cover and the rear cover are respectively mounted at the two ends of the sleeve, the stator assembly is sleeved on the inner wall of the sleeve, the shielding sleeve is sleeved inside the stator assembly, the rotor assembly is placed inside the shielding cavity of the shielding sleeve, the shielding sleeve isolates the stator assembly from the rotor assembly, and the controller is mounted at the bottom of the rear cover; the pump casing assembly comprises a volute, an impeller and a cover plate; the cover plate is mounted on the front cover, the volute is mounted on the cover plate to form a cavity, a water inlet and a water outlet are arranged on the volute to communicate with the cavity, the impeller is mounted inside the cavity and connected to the shaft extension end of the rotating shaft; it is characterized in that: the rear cover comprises an annular outer plate and an inner plate, the inner plate is mounted In the middle of the annular outer plate, the inner plate is a metal plate, and the annular outer plate is a plastic plate. The top end surface of the inner plate is provided with a rear bearing seat, and the bottom end surface of the front end cover is provided with a front bearing seat. The outer edge of the rear bearing seat is provided with a rear positioning stop, and the outer edge of the front bearing seat is provided with a front positioning stop. The two ends of the shielding sleeve are sleeved on the front positioning stop and the rear positioning stop, and the sleeve and the controller are respectively installed on the two end surfaces of the annular outer plate. The annular outer plate is located between the sleeve and the controller, which blocks the heat generated by the stator assembly from flowing into the controller, thereby greatly improving the upper limit of the product's operating environment temperature. In addition, the plastic annular outer plate blocks the conduction between the inner circulating fluid and the sleeve, ensuring the insulation requirements of the inner circulating liquid and the controller and the sleeve, indirectly simplifying the product structure and reducing product costs.

[0019] 2. Other advantages of the utility model are described in detail in the embodiment section of the specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A stereogram provided for the utility model;

[0021] Figure 2 A partial exploded view provided for the utility model;

[0022] Figure 3 A schematic diagram of a local structure provided by the utility model;

[0023] Figure 4 A top view provided for the utility model;

[0024] Figure 5 for Figure 4 Sectional view of AA in the middle;

[0025] Figure 6 A schematic diagram of the rear end cover structure provided by the utility model;

[0026] Figure 7 This is an exploded view of the rear end cover provided by the utility model. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] Embodiment 1:

[0029] like Figures 1 to 7 As shown, this embodiment provides a canned pump, including a pump housing assembly 1, a motor 2 and a controller 3;

[0030] Wherein: the motor 2 comprises a rotating shaft 21, a sleeve 22, a stator assembly 23, a rotor assembly 24, a front end cover 25, a rear end cover 26 and a shielding sleeve 20, the front end cover 25 and the rear end cover 26 are respectively mounted on both ends of the sleeve 22, the stator assembly 23 is sleeved on the inner wall of the sleeve 22, the shielding sleeve 20 is sleeved inside the stator assembly 23, the rotor assembly 24 is placed in the shielding cavity 201 of the shielding sleeve 20, the shielding sleeve 20 isolates the stator assembly 23 from the rotor assembly 24, and the controller 3 is mounted at the bottom of the rear end cover 26;

[0031] The pump housing assembly 1 includes a volute 11, an impeller 12 and a cover plate 13; the cover plate 13 is mounted on the front cover 25, the volute 11 is mounted on the cover plate 13 to form a cavity 10, the volute 11 is provided with a water inlet 11a and a water outlet 11b which are connected to the cavity 10, the impeller 12 is installed in the cavity 10 and connected to the shaft extension end of the rotating shaft 21;

[0032] The rear end cover 26 comprises an annular outer plate 261 and an inner plate 262, the inner plate 262 is installed in the middle of the annular outer plate 261, the inner plate 262 is a metal plate, the annular outer plate 261 is a plastic plate, the top end surface of the inner plate 262 is provided with a rear bearing seat 2621, the bottom end surface of the front end cover 25 is provided with a front bearing seat 251, the outer edge of the rear bearing seat 2621 is provided with a rear positioning stop 2622, the outer edge of the front bearing seat 251 is provided with a front positioning stop 252, and the two ends of the shielding sleeve 20 are sleeved It is arranged on the front positioning stop 252 and the rear positioning stop 2622, and the sleeve 22 and the controller 3 are respectively installed on the two end surfaces of the annular outer plate 261. The annular outer plate is located between the sleeve and the controller, which blocks the heat generated by the stator assembly from flowing into the controller, thereby greatly improving the upper limit of the product's operating environment temperature. In addition, the plastic annular outer plate blocks the conduction between the inner circulating fluid and the sleeve, ensuring the insulation requirements of the inner circulating liquid and the controller and the sleeve, indirectly simplifying the product structure and reducing product costs.

[0033] The inner plate 262 is provided with a through hole 2623 for the lead wire of the stator assembly 23 to pass through. The lead wire of the stator assembly 23 passes through the through hole 2623 and extends into the controller 3. The structure is reasonably arranged and convenient for the lead wire connection.

[0034] An annular groove 2611 is provided on the inner side of the annular outer plate 261 , and the inner plate 262 is embedded in the annular groove 2611 . The installation structure is simple and the fixing effect is good.

[0035] The inner plate 262 is made of 316L stainless steel or aluminum alloy; the annular outer plate 261 is made of PA66+glass fiber plastic.

[0036] The above-mentioned controller 3 includes a control box 31, a circuit board 32, a plurality of IGBT modules 33 and capacitors 34. The circuit board 32 is installed inside the control box 31. The plurality of IGBT modules 33 and capacitors 34 are respectively installed on the two end surfaces of the circuit board 32. The plurality of IGBT modules 33 are tightly attached to the end surface of the inner plate 262. In the process of heat transfer from the IGBT module to the inner circulation liquid, a method of shortening the heat transfer path is adopted. The heat of the IGBT module is transferred to the inner circulation fluid through the inner plate made of metal material, thereby reducing the thermal resistance of the heat transfer path, making the IGBT module dissipate more heat, and improving the working environment temperature of the IGBT module.

[0037] A ceramic insulating sheet 30 is disposed between the aforementioned plurality of IGBT modules 33 and the inner plate 262 , and the structure is reasonably arranged to improve the heat dissipation effect.

[0038] The bottom of the control box 31 is also provided with a bottom plate 35 cover, and a thermal conductive silicone pad 36 is provided between the capacitor 34 and the bottom plate 35. The capacitor transfers heat to the bottom plate 35 through natural cooling and dissipation, thereby increasing the working environment temperature of the capacitor by blocking the path for the stator heat to diffuse.

[0039] The above-mentioned sleeve 22, annular outer plate 261, control box 31 and circuit board 32 are respectively provided with corresponding first mounting hole 221, second mounting hole 2612, third mounting hole 311 and fourth mounting hole 321. The sleeve 22, annular outer plate 261, control box 31 and circuit board 32 are fixed together by screws 100 passing through the fourth mounting hole 321, the third mounting hole 311, the second mounting hole 2612 and lockingly connected with the first mounting hole 221, so that the sleeve 22, the annular outer plate 261, the control box 31 and the circuit board 32 are simple in installation structure.

[0040] Embodiment 2:

[0041] A fuel cell includes a stack module, a hydrogen supply system, an air supply system and a cooling system, wherein the cooling system includes a shielded pump, and wherein the shielded pump is the shielded pump described in the first embodiment.

[0042] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited thereto. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present invention are equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A canned motor pump, comprising a pump housing assembly (1), a motor (2) and a controller (3); in: The motor (2) comprises a rotating shaft (21), a sleeve (22), a stator assembly (23), a rotor assembly (24), a front end cover (25), a rear end cover (26) and a shielding sleeve (20), wherein the front end cover (25) and the rear end cover (26) are respectively mounted on two ends of the sleeve (22), the stator assembly (23) is sleeved on the inner wall of the sleeve (22), the shielding sleeve (20) is sleeved inside the stator assembly (23), the rotor assembly (24) is placed inside a shielding cavity (201) of the shielding sleeve (20), the shielding sleeve (20) isolates the stator assembly (23) from the rotor assembly (24), and the controller (3) is mounted at the bottom of the rear end cover (26); The pump casing assembly (1) comprises a volute (11), an impeller (12) and a cover plate (13); the cover plate (13) is mounted on a front end cover (25), the volute (11) is mounted on the cover plate (13) to form a cavity (10), a water inlet (11a) and a water outlet (11b) are arranged on the volute (11) and communicate with the cavity (10), the impeller (12) is mounted inside the cavity (10) and connected to the shaft extension end of the rotating shaft (21); The invention is characterized in that: the rear end cover (26) comprises an annular outer plate (261) and an inner plate (262), the inner plate (262) is installed in the middle of the annular outer plate (261), the inner plate (262) is a metal plate, and the annular outer plate (261) is a plastic plate, the top end surface of the inner plate (262) is provided with a rear bearing seat (2621) for installing the rear bearing (260), the bottom end surface of the front end cover (25) is provided with a front bearing seat (251) for installing the front bearing (250), the outer edge of the rear bearing seat (2621) is provided with a rear positioning stop (2622), the outer edge of the front bearing seat (251) is provided with a front positioning stop (252), the two ends of the shielding sleeve (20) are sleeved on the front positioning stop (252) and the rear positioning stop (2622), and the sleeve (22) and the controller (3) are respectively installed on the two end surfaces of the annular outer plate (261).

2. A canned motor pump according to claim 1, characterized in that: The inner plate (262) is provided with a through hole (2623) for the lead wire of the stator assembly (23) to pass through, and the lead wire of the stator assembly (23) passes through the through hole (2623) and extends into the controller (3).

3. A canned motor pump according to claim 2, characterized in that: An annular clamping groove (2611) is provided on the inner side of the annular outer plate (261), and the inner plate (262) is embedded in the annular clamping groove (2611).

4. A canned motor pump according to claim 1, characterized in that: The inner plate (262) is made of 316L stainless steel or aluminum alloy; the annular outer plate (261) is made of PA66+glass fiber plastic.

5. A canned motor pump according to claim 1, 2, 3 or 4, characterized in that: The controller (3) comprises a control box (31), a circuit board (32), a plurality of IGBT modules (33) and a capacitor (34); the circuit board (32) is installed inside the control box (31); the plurality of IGBT modules (33) and the capacitor (34) are installed on both end surfaces of the circuit board (32) respectively; and the plurality of IGBT modules (33) are closely attached to the end surface of the inner plate (262).

6. A canned motor pump according to claim 5, characterized in that: A ceramic insulating sheet (30) is provided between the plurality of IGBT modules (33) and the inner plate (262).

7. A canned motor pump according to claim 6, characterized in that: A bottom plate (35) is also provided at the bottom of the control box (31) to seal the bottom, and a heat-conducting silicone pad (36) is provided between the capacitor (34) and the bottom plate (35).

8. A canned motor pump according to claim 7, characterized in that: The sleeve (22), the annular outer plate (261), the control box (31) and the circuit board (32) are respectively provided with a first mounting hole (221), a second mounting hole (2612), a third mounting hole (311) and a fourth mounting hole (321) corresponding thereto, and the sleeve (22), the annular outer plate (261), the control box (31) and the circuit board (32) are fixed together by screws (100) passing through the fourth mounting hole (321), the third mounting hole (311) and the second mounting hole (2612) and lockingly connected with the first mounting hole (221).

9. 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 canned pump, characterized in that: The canned motor pump is a canned motor pump as described in any one of claims 1 to 8.

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