JP4665543B2 - Pump and liquid supply apparatus having the same - Google Patents

Description

  The present invention relates to a pump that is driven by a motor and sucks and discharges liquid, and a liquid supply apparatus that includes the pump.

  The pump mainly includes a stator that generates a magnetic field, a control unit that controls the stator, a rotor unit that is driven by the magnetic field generated by the stator, and an impeller that is magnetically coupled to or directly connected to the rotor unit. The pump part which sucks and discharges liquids, such as, and the partition which isolates a motor part and a pump part are comprised.

Among these, the resin-coated inner magnet driven by magnetic coupling has a structure in which the resin-coated layer and the inner magnet are protected by finishing the resin-coated layer into a cylindrical shape and providing a cylindrical sleeve on the outer peripheral portion. It has been proposed (see, for example, Patent Document 1).
JP-A-11-148482

  However, in the above-described conventional configuration, since the outer circumference of the inner magnet is covered with the resin and the cylindrical sleeve, the thickness of the resin and the cylindrical sleeve is necessary, which limits the outer diameter of the inner magnet, resulting in performance. There has been a problem of causing a decrease (a decrease in transmission torque due to a distance between the inner magnet and the outer magnet).

  In addition, since the cylindrical sleeve is fixed with a screw, the distance between the bulkhead and the cylindrical sleeve is required beyond the height of the screw head, and the performance is further reduced (transmission due to the distance between the inner magnet and the outer magnet being separated). There was a problem of incurring torque reduction.

  Furthermore, since the cylindrical sleeve is inserted into the resin-coated portion, a post-working operation on the outer periphery is required, and the cylindrical sleeve requires a resin portion, a screw, and a fixing operation, leading to an increase in cost.

  The present invention solves such a conventional problem, and since the outer diameter of the inner magnet is not limited by the resin, the performance is not deteriorated, and it is small and low-cost that does not require processing of the resin part or screw installation. The purpose is to provide a pump.

For the present invention to achieve the above object, it comprises a pump unit having an impeller for sucking and discharging liquid, and a motor unit for driving the pump unit, a rotor which is disposed a magnet connected to the impeller The rotor includes a case having a predetermined thickness for housing the magnet, a cover that covers an outer periphery of the magnet, and each of the magnet, the case, and the cover disposed between the magnet and the case. And a sealing member for preventing water from penetrating between them, and the magnet, the cover, and the sealing member are integrally molded with a resin forming the case .

  With this configuration, the effect that the inner magnet can be sealed from the fluid transferred by the pump can be achieved.

Since the outer diameter of the inner magnet is not limited, the present invention has an effect that the performance is not deteriorated, and a small and low-cost pump that does not require processing of the resin portion and screw attachment can be provided.

Embodiments of the present invention includes a pump unit having an impeller for sucking and discharging liquid, and a motor unit for driving the pump unit, a rotor which is disposed a magnet connected to said impeller, said rotor However, a case having a predetermined thickness for housing the magnet , a cover that covers the outer periphery of the magnet, and a magnet disposed between the magnet and the case and between each of the magnet, the case, and the cover. And a sealing member that prevents water from entering, and the magnet, the cover, and the sealing member are integrally molded with a resin that forms the case .

  As a result, the inner magnet can be sealed from the fluid transferred by the pump, and the outer diameter of the inner magnet is not limited, so it has high performance, and a compact and low-cost pump that does not require resin processing or screw installation. Can be provided.

The cover may be made of stainless steel.

  In this case, since the thickness of the case can be reduced, the outer diameter of the inner magnet is not limited, and a pump having high performance can be provided.

  And if the said pump is integrated in liquid supply apparatuses, such as a water supply apparatus, the usability of a liquid supply apparatus can be improved greatly.

  Embodiments of the present invention will be described below with reference to the drawings. 1 is an overall schematic diagram of a heat dissipation unit according to the first embodiment, FIG. 2 is a cross-sectional view of a pump according to the first and second embodiments, FIG. 3 is a cross-sectional view of a rotor according to the first and second embodiments, and FIG. FIG. 5 is a developed sectional view of the rotor according to the first embodiment, and FIG. 5 is a developed sectional view of the rotor according to the second embodiment.

Example 1
In FIG. 1, there is a heat radiating unit 1 for radiating heat, a pump 3 for sucking and discharging the circulating fluid 2 inside the heat radiating unit 1, gas, electricity or kerosene for heating the circulating fluid 2, etc. The heating unit 4 using is installed.

  A circulation path 5 is connected between the heat dissipation unit 1 and the pump 3, a circulation path 6 is connected between the pump 3 and the heating unit 4, and a circulation return path 7 is connected between the heating unit 4 and the heat dissipation unit 1. The circulation path 5 and the circulation return path 7 are connected and are made of heat-resistant polyvinyl chloride (vinyl chloride), stainless steel, or the like.

  As shown in FIGS. 2 and 3, the casing 8 of the pump 3 has a suction port and a discharge port (not shown) for the circulating fluid 2, and a pump chamber 11 is formed by the casing 8, the separation plate 9 and the O-ring 10. Has been. A shaft 12, a bearing plate 13, and a bearing plate 14 are provided in the pump chamber 11, and the shaft 12 includes an impeller 15, a bearing 16, a magnet 17, a cover 18, a seal member a19, a seal member b20, a resin portion a21, and a resin. A rotor 23 including a part b22 is rotatably provided.

  A stator 25 press-fitted into the motor frame 24 is provided on the outer peripheral side of the magnet 17 through the separation plate 9, and the casing 8, the separation plate 9 and the motor frame 24 are provided with screws a 26 (not shown in FIG. 3 out of four). ). The stator 25 is provided with a sensor board 28 for detecting the rotational position, and the sensor board 28 transmits a rotational position detection signal to a control board 31 provided in the board case 30 via the relay connector 29. The substrate case 30 is attached to the motor frame 24 by a bracket 32.

  When an external power supply + control signal 33 is supplied to the pump 3, power is supplied from the control board 31 to the motor unit composed of the rotor 23 and the stator 25, the rotor 23 rotates and the sensor board 28 controls the rotation signal. By transmitting to the substrate 31, the control substrate 31 controls the rotation of the rotor 23, and the impeller 15 of the pump 3 operates as a pump that sucks and discharges the circulating fluid 2.

  In the above configuration, the magnet 17 provided on the rotor 23 is protected from the circulating fluid 2 by being sealed by the cover 18, the seal member a 19, the seal member b 20, and the resin portion a 21 provided on the outer periphery of the magnet 17. be able to.

  In addition, the cover 18 can be made thin by using a non-magnetic metal (austenite stainless steel, titanium, etc.), and the performance can be improved by making the distance between the magnet 17 and the stator closer. It is.

  As shown in FIG. 4, the magnet 17, the cover 18, the seal member a19, and the seal member b20 are inserted into the resin portion a21, and the resin portion b22 is welded to the resin portion a21, so that the rotor can be easily assembled. Thus, by welding the impeller 15 to the rotor, it is possible to provide a rotor-integrated impeller that is excellent in assembling and low in cost.

(Example 2)
As shown in FIGS. 2 and 3, the casing 8 has a suction port and a discharge port (not shown) for the circulating fluid 2, and a pump chamber 11 is formed by the casing 8, the separation plate 9 and the O-ring 10. .

  A shaft 12, a bearing plate 13, and a bearing plate 14 are provided in the pump chamber 11, and the shaft 12 includes an impeller 15, a bearing 16, a magnet 17, a cover 18, a seal member a 19, a seal member b 20, a resin portion a 21, and a resin. A rotor 23 including a part b22 is rotatably provided.

  A stator 25 press-fitted into the motor frame 24 is provided on the outer peripheral side of the magnet 17 through the separation plate 9, and the casing 8, the separation plate 9 and the motor frame 24 are provided with screws a 26 (not shown in FIG. 3 out of four). ).

  The stator 25 is provided with a sensor board 28 for detecting the rotational position, and the sensor board 28 transmits a rotational position detection signal to a control board 31 provided in the board case 30 via the relay connector 29. The substrate case 30 is attached to the motor frame 24 by a bracket 32.

  When an external power supply + control signal 33 is supplied to the pump 3, power is supplied from the control board 31 to the motor unit composed of the rotor 23 and the stator 25, the rotor 23 rotates and the sensor board 28 controls the rotation signal. By transmitting to the substrate 31, the control substrate 31 controls the rotation of the rotor 23, and the impeller 15 of the pump 3 operates as a pump that sucks and discharges the circulating fluid 2.

  In the above configuration, the magnet 17 provided on the rotor 23 is protected from the circulating fluid 2 by being sealed by the cover 18, the seal member a 19, the seal member b 20, and the resin portion a 21 provided on the outer periphery of the magnet 17. be able to.

  Further, the cover 18 is made of a non-magnetic metal (such as austenitic stainless steel or titanium), so that the cover 18 can be thinned, and the performance can be improved by bringing the distance between the magnet 17 and the stator closer. .

  In FIG. 5, by inserting the bearing 16, the magnet 17, the cover 18, the seal member a19, and the seal member b20 into a mold for resin molding and integrally molding the resin portion c34, the assembly work of the rotor becomes unnecessary. By welding the impeller 15 to the rotor, it is possible to provide a rotor-integrated impeller that is excellent in assembling and low in cost.

  In the first embodiment, the resin part b22 is welded to the resin part a21. However, the resin part b22 may be attached to the resin part b22 with a screw or the like.

  In the first and second embodiments, the impeller 15 is welded to the rotor 23. However, the impeller may be an open blade, and the impeller may be formed at the same time as the integral molding.

  In the second embodiment, the bearing 16, the magnet 17, the cover 18, the seal member a19, and the seal member b20 are inserted into a resin molding die and integrally molded by the resin portion c34. It may be inserted into a mold and integrally molded with the plastic magnet 35, or the impeller may be an open vane, and the impeller may be molded simultaneously with the integral molding.

  In this embodiment, a fluid circulation device is shown as an embodiment of the liquid supply device. However, any liquid supply device such as a well pump device, a hot water supply device, or a drainage supply device may be used.

  The pump of the present invention can be expected to be applied to various pumps used in, for example, fuel cell devices and heat pump devices.

Overall schematic diagram of heat dissipation unit according to Example 1 Cross-sectional view of pumps according to Example 1 and Example 2 Sectional view of rotor according to Example 1 and Example 2 Development sectional view of rotor according to embodiment 1 Development sectional view of rotor according to embodiment 2

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heat radiation unit 2 Circulating fluid 3 Pump 4 Heating part 5 Circulation forward path 6 Circulation path 7 Circulation return path 8 Casing 9 Separation plate 10 O-ring 11 Pump chamber 12 Shaft 13 Bearing plate 14 Bearing plate 15 Impeller 16 Bearing 17 Magnet 18 Cover 19 Seal 19 Member a
20 Seal member b
21 Resin part a
22 Resin part b
23 Rotor 24 Motor frame 25 Stator 26 Screw a
27 screw b
28 Sensor Board 29 Relay Connector 30 Board Case 31 Control Board 32 Bracket 33 Power Supply + Control Signal 34 Resin C
35 Plastic Magnet

Claims (3)

A pump unit having an impeller for sucking and discharging liquid; and a motor unit for driving the pump unit, the rotor having a magnet connected to the impeller and provided with a magnet, wherein the rotor stores the magnet A case having a thickness of: a cover that covers the outer periphery of the magnet; and a seal member that is disposed between the magnet and the case to prevent water from entering between each of the magnet, the case, and the cover The pump is characterized in that the magnet, the cover, and the seal member are integrally molded with a resin that forms the case . The pump according to claim 1, wherein the cover is made of stainless steel. A liquid supply apparatus comprising the pump according to claim 1.

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