JP2013253610A - Method for manufacturing water circulation pump and heat pump device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water circulation pump which is small in whirling of a rotor part of the pump, and has high efficiency and a long life.SOLUTION: S31 is the insert step. At S31, a shaft 27 and "a mold resin 16 in a state of trapping a stator 17a" are inserted into a molding die of a lower casing 15. S32 is the injection step of a thermoelastic resin. At S32, the thermoelastic resin is injected into the molding die into which an end of the shaft 27 and "the mold resin 16 in a state of trapping the stator 17a and being cured" are inserted to mold the lower casing 15. Thus, the shaft 27 and "the stator 17a molded with the mold resin 16" are inserted into the die to inject the thermoelastic resin for molding, thereby including the end of the shaft 27 and the mold resin 16 to mold the lower casing 15 integrally therewith. SPS (Syndiotactic PolyStyrene) is used as the thermoelastic resin.

Description

  The present invention relates to a method for manufacturing a water circulation pump.

  A pump used in a conventional heat pump device using water as a refrigerant includes a stator portion, a rotor portion, a pump portion, and a shaft. The shaft is fixed, and the rotor part freely rotates around the shaft. The stator portion is an iron core formed by laminating electromagnetic steel sheets, a winding wound around the slot of the iron core via an insulator (insulating member), a circuit board to which a lead wire is connected, and a hollow cylinder having a bottom portion And a substantially casing-shaped lower casing. The circuit board is disposed in the vicinity of the side opposite to the pump portion of the stator portion. The rotor portion is housed in the hollow cylindrical shape of the substantially casing-shaped lower casing. A shaft hole into which the shaft fits is formed at a substantially central portion of the bottom portion of the lower casing. The shaft is fitted in the shaft hole so as not to rotate. Therefore, a part of the circular shape of the shaft that fits into the shaft hole is cut away. The end of the shaft on the pump part side has the same shape. The shaft hole is also substantially the same shape as the shaft, and has a diameter that is slightly larger than the diameter of the shaft (for example, Patent Document 1 and Patent Document 2).

JP2003-114052A JP 2008-215738 A JP-A-10-220386 JP 2008-008222 A

  Since the water circulation pump used in the conventional heat pump device has only inserted the shaft into the shaft hole of the casing, there is a state where there is a gap between the shaft and the shaft hole in order to ensure insertability. For this reason, shaft blurring occurs when the rotor rotates, causing problems such as large vibrations due to the rotor swinging, uneven wear of the bearings, and shaft locking of the rotor.

  In addition, considering the runout of the rotor, it is necessary to reduce the outer diameter of the rotor so as not to touch the lower casing, and the gap between the rotor magnet and the iron core increases (the mutual magnetic attraction in proportion to the square of the distance). There was a problem that the efficiency of the pump was lowered.

  When resin is used for the casing, since the resin has a larger linear expansion coefficient than that of the mold resin or the metal stator stator, there are problems such as cracking of the resin due to stress or water pressure due to the thermal cycle.

  An object of the present invention is to provide a heat pump device that prevents damage to the bearings and casing of the pump and has high efficiency and long life.

The manufacturing method of the water circulation pump of the present invention is as follows:
The axis,
A pump unit having a first casing formed with a first recess that restrains rotation of the shaft and receives one end of the shaft;
A stator portion having a second casing formed with a second recess for receiving the other end of the shaft by restraining rotation of the shaft, and a stator for rotating the rotor by electromagnetic interaction;
A rotor portion that is a rotor that has a bearing rotatably attached to the shaft, and a magnet portion that is fixedly attached to the bearing, and that is rotated by electromagnetic interaction with the stator of the stator portion; In the manufacturing method of the water circulation pump provided with
The other end of the shaft at a position corresponding to the second recess in the molding die for molding the second casing capable of inserting the other end of the shaft into a position corresponding to the second recess. A first insert step of inserting
By injecting a thermoplastic resin into a molding die of the second casing in which the other end of the shaft is inserted, the outer peripheral surface of the other end of the shaft and the inner periphery of the second recess And an injection process for forming the second casing by integrating the surface with no gap,
The second casing is
A mold resin having a bottom and a hollow cylinder standing up from the bottom, the shaft and the rotor being housed in a space inside the hollow cylinder, and an outer side of the hollow cylinder confining the stator Form an interface between
The mold for molding the second casing is:
The mold resin enclosing the stator can be inserted,
The first insert step includes
Including the step of inserting the mold resin in which the stator is confined into the molding die of the second casing,
The injection process includes
Injecting the thermoplastic resin into the molding die in which the other end of the shaft and the mold resin confining the stator are inserted,
The thermoplastic resin is
It is SPS (syndiotactic polystyrene).

  According to the present invention, it is possible to prevent damage to the bearing and casing of the water circulation pump, and it is possible to provide a highly efficient and long-life heat pump device.

1 is a configuration diagram of a heat pump device in Embodiment 1. FIG. Sectional drawing of the pump 2 in Embodiment 1. FIG. 3 is a flow showing main manufacturing steps of the pump 2 in the first embodiment. 9 is a flow showing main manufacturing steps of the pump 2 in the second embodiment. 9 is a flow showing main manufacturing steps of the pump 2 in the third embodiment. 10 is a flow showing main manufacturing steps of the pump 2 in the fifth embodiment. 9 is a flow showing main manufacturing steps of the pump 2 in the sixth embodiment.

Embodiment 1 FIG.
The first embodiment will be described with reference to FIGS. Embodiment 1 demonstrates the pump 2 (water circulation pump) which is used for the heat pump apparatus 100 and circulates water. The pump 2 according to the first embodiment is characterized in that a predetermined gap is provided in a gap between a shaft to which the rotor portion is attached and a case-side attachment portion (a first concave portion or a second concave portion to be described later). The resin or the predetermined adhesive is filled. By filling the gap with resin or the like, it is possible to reduce the whirling of the rotor portion when the rotor portion rotates. An example of the resin is PPS (polyphenylene sulfide). Examples of the adhesive include an epoxy adhesive and an acrylic adhesive.

  FIG. 1 is a configuration diagram of the heat pump apparatus 100. FIG. 2 is a sectional view of the pump 2.

(Heat pump device 100)
As shown in FIG. 1, the heat pump apparatus 100 includes a compressor (not shown), a heat exchanger 3, and the like. The heat pump apparatus 100 includes a refrigerant circuit 5 through which a refrigerant 9 flows, a tank 1, a pump 2, a heat exchanger 3, and the like. Further, the heat pump device 100 inputs the water circuit 4 through which the water 8 flows, the water temperature detecting means 6 for detecting the water temperature of the water circuit 4, the water temperature setting command signal 7a, and the water temperature information 6a from the water temperature detecting means 6. A water amount control unit 7 for outputting a speed command signal 2a to the pump 2;

(Configuration of pump 2)
The configuration of the pump 2 will be described with reference to FIG. As shown in FIG. 2, the pump 2 includes a stator portion 17, a rotor portion 21, a pump portion 26, and a shaft 27. The shaft 27 is fixed, and the rotor portion 21 rotates around the shaft 27.

(Stator part 17)
First, the structure of the stator part 17 is demonstrated.
(1) The stator portion 17 includes a substantially donut-shaped iron core 10 formed by laminating a plurality of electromagnetic steel plates punched into a predetermined shape, and an insulator 12 (insulating member) in a slot (not shown) of the iron core 10. A circuit board 13 connected with a lead wire 14 and a lower casing 15 (second casing) having a substantially hook shape.
(2) The iron core 10 and the winding 11 inserted into the slot (not shown) of the iron core 10 via the insulator 12 (insulating member) are connected to the rotor portion 21 (rotation) by electromagnetic interaction with the rotor portion 21. The stator 17a (stator) is configured to rotate by generating a rotation moment in the child).
(3) The circuit board 13 is disposed in the vicinity of one axial end of the stator portion 17 (direction opposite to the pump portion 26).
(4) The rotor portion 21 is accommodated in the space inside the lower casing 15 having a substantially hook shape. As shown in FIG. 2, the lower casing 15 has a shape having a bottom portion 15b and a hollow cylinder 15c rising from the bottom portion 15b, and the shaft 27 and the rotor portion 21 are accommodated in a space inside the hollow cylinder 15c. . As will be described later, the lower casing 15 forms an interface with the mold resin in which the outer side of the hollow cylinder 15c confines the stator 17a. Further, a lower casing shaft hole 15 a into which the shaft 27 is fitted is formed at a substantially central portion of the bottom portion 15 b of the lower casing 15. The lower casing shaft hole 15 a receives the end of the shaft 27 by restraining the rotation of the shaft 27. The shaft 27 is inserted into the lower casing shaft hole 15a so as not to rotate. Therefore, a circular part of the shaft 27 inserted into the lower casing shaft hole 15a is cut out. The end portion of the shaft 27 on the pump portion 26 side has the same shape (the lower casing shaft hole 15a is also substantially the same shape as the shaft 27 and has a diameter slightly larger than the diameter of the shaft 27. The upper casing shaft hole 24a also has the same shape. The shape is the same as that of the lower casing shaft hole 15a.
(5) The minute gap between the shaft 27 and the lower casing shaft hole 15a is filled with a filler (filler) such as a water-resistant and heat-resistant adhesive or resin and firmly fixed without rattling.
(6) The stator portion 17 is integrally formed by using the mold resin 16 with the stator 17 a having the iron core 10 wound with the winding 11 and the circuit board 13. The outer portion of the stator portion 17 is formed of a mold resin 16. The bearing 18, the wheel 19, and the magnet unit 20 constitute a rotor unit 21 together.

(Rotor part 21)
The rotor portion 21 includes a bearing 18 at a substantially central portion. The rotor portion 21 (bearing 18) is rotatably attached to the shaft 27. A resin wheel 19 is disposed outside the bearing 18. Further, a magnet portion 20 is provided outside the wheel 19. The magnet portion 20 is formed by kneading and molding a magnetic powder such as ferrite and a resin.

(Brushless DC motor)
The stator unit 17 and the rotor unit 21 constitute, for example, a brushless DC motor.

(Pump unit 26)
The pump unit 26 includes an upper casing 24 (first casing) having a water suction port 22 and a discharge port 23, and an impeller 25. The upper casing 24 is formed with an upper casing shaft hole 24 a (first recess) that receives the end of the shaft 27 by restricting the rotation of the shaft 27. The impeller 25 is fixedly attached to the rotor unit 21 and rotates together with the rotor unit 21. The water circuit 4 is connected to the water suction port 22 and the discharge port 23.

(Example of manufacturing method of pump 2)
An example of an assembly process of the pump 2 according to the first embodiment will be described with reference to FIG.
(1) In S11, the end of the shaft 27 is inserted into the lower casing shaft hole 15a of the lower casing 15. As a result, the shaft 27 is fixed to the lower casing 15. And the bearing 18 of the rotor part 21 is inserted in the axis | shaft 27 fixed to the lower casing 15, and the hole part of the washer 28 is penetrated further in the upper part. The washer 28 and the end face of the bearing 18 come into contact with each other to form a thrust bearing. And the pump part 26 side edge part of the axis | shaft 27 which penetrated the washer 28 is inserted in the upper casing shaft hole 24a, and the pump part 26 enclosed by the upper and lower casings is comprised. The rotor portion 21 to which the impeller 25 is fixed is rotatable around the shaft 27.
(2) In S12, in the pump 2, the gap between the outer peripheral surface of the upper casing 24 side end of the shaft 27 and the inner peripheral surface of the upper casing shaft hole 24a, the outer peripheral surface of the end of the shaft 27, and the lower At least one of the gaps with the inner peripheral surface of the casing shaft hole 15a is filled with a filler (a predetermined resin or a predetermined adhesive) that fills the gap.

  A space surrounded by the lower casing 15 and the upper casing 24 is filled with water (hot water) of the water circuit 4. Therefore, the rotor unit 21, the impeller 25, the shaft 27, and the washer 28 are configured to touch water (hot water) flowing through the pump 2. The pump 2 is a cand system in which water flowing inside the pump 2 is in contact with the rotor part 21 of the brushless DC motor.

  In the pump 2 of the first embodiment, the gap between the outer peripheral surface of the end on the upper casing 24 side of the shaft 27 and the inner peripheral surface of the upper casing shaft hole 24a, the outer peripheral surface of the end of the shaft 27, and the lower casing At least one of the gaps with the inner peripheral surface of the shaft hole 15a is filled with a filler (a predetermined resin or a predetermined adhesive) that fills the gap. For this reason, there is no backlash between the shaft 27 and the lower casing 15, and the gap between the rotor 21 and the iron core 10 can be narrowed. Therefore, knitted wear and damage of the bearing 18 can be prevented, and the pump efficiency can be increased.

Embodiment 2. FIG.
Next, the second embodiment will be described with reference to FIGS. The second embodiment is a method for manufacturing the pump 2 in which at least the lower casing 15 of the upper and lower casings is formed of a thermoplastic resin in FIG. The manufacturing method of the pump 2 according to the second embodiment is a manufacturing method in which the shaft 27 is inserted into a casing molding die, a thermoplastic resin is injection-molded, and the lower casing 15 is molded with the shaft 27 engaged. . Examples of the thermoplastic resin include PPS and SPS (syndiotactic polystyrene).

  With reference to FIG. 4, the case where the lower casing 15 is shape | molded with a thermoplastic resin is demonstrated.

(S21)
S21 is an insert process (first insert process) of the shaft 27. The molding die for the lower casing 15 used in this step can insert the end of the shaft 27 at a position corresponding to the lower casing shaft hole 15a (second recess). In S21, the end of the shaft 27 is inserted at a position corresponding to the lower casing shaft hole 15a in the molding die for the lower casing 15.

(S22)
S22 is a thermoplastic resin injection process. In S22, the thermoplastic resin is injected into the molding die of the lower casing 15 in which the end portion of the shaft 27 is inserted, so that the outer peripheral surface of the end portion of the shaft 27 and the shaft 27 of the lower casing shaft hole 15a are fitted. The lower casing 15 is formed by integrating with the peripheral surface 15d without any gap.

  As described above, the shaft 27 is formed integrally with the lower casing 15 while being inserted into the molding die for the lower casing, so that the backlash between the shaft 27 and the lower casing shaft hole 15a is eliminated. Damage can be prevented, and the pump 2 can be made highly efficient and have a long service life. Furthermore, compared to the first embodiment, it is easy to secure the fixing force between the shaft 27 and the lower casing 15 (lower casing shaft hole 15a), and the process is simplified, so that the productivity is excellent.

Embodiment 3 FIG.
Next, Embodiment 3 will be described with reference to FIGS. The third embodiment is a method of manufacturing the pump 2 in which the shaft 27 and the mold resin in a state where the stator is confined are inserted into a mold, and a thermoplastic resin is injected into the mold to mold the lower casing 15.

  In the molding die of the lower casing 15 of the third embodiment, the molding resin 16 in a state where the stator 17a is confined can be inserted into the molding die of the second embodiment.

  With reference to FIG. 5, the manufacturing method of the pump 2 of Embodiment 3 is demonstrated.

(S31)
S31 is an insert process. In S <b> 31, the shaft 27 and “the mold resin 16 in a state where the stator 17 a is confined” are inserted into a molding die of the lower casing 15.

(S32)
S32 is a thermoplastic resin injection process. In S32, the lower casing 15 is molded by injecting a thermoplastic resin into a molding die in which the end portion of the shaft 27 and the “cured mold resin 16 in which the stator 17a is confined” are inserted.

  As described above, the shaft 27 and the “stator 17a molded with the mold resin 16” are inserted into the mold and the thermoplastic resin is injected and molded. The lower casing 15 is molded integrally with these. As a result, rattling between the shaft 27 and the lower casing shaft hole 15a is eliminated, and uneven wear and breakage of the bearing 18 are prevented, thereby achieving high efficiency and a long life. Further, as shown in FIG. 2, the lower casing 15 formed integrally with the stator 17a confined in the mold resin 16 is in contact with the inner diameter of the mold resin confining the stator 17a without any gap. For this reason, compared with the case where the lower casing 15 molded by resin alone is inserted, there are effects such as “higher strength” and “practical damage to the pump portion 26 due to water pressure”. Further, the thickness can be further reduced while maintaining the same strength as that of the resin alone. For this reason, the clearance gap between the rotor part 21 and the iron core 10 can be narrowed, and efficiency can be improved.

Embodiment 4 FIG.
Next, a fourth embodiment will be described. The fourth embodiment is an embodiment in which at least the lower casing 15 of the upper casing 24 and the lower casing 15 is formed of a nonmagnetic metal.

  That is, in FIG. 2, at least the lower casing 15 of the upper and lower casings is formed by plastic working of a nonmagnetic metal that is superior in strength to resin. As a result, the casing can be made thinner. By using a non-magnetic metal, the casing can be made thinner than the resin. For this reason, since the clearance gap between the rotor part 21 and the iron core 10 can be narrowed, pump efficiency can be improved. Further, when the lower casing 15 is made of a nonmagnetic metal, there is no adverse effect such as a decrease in the magnetic attractive force between the rotor portion 21 and the iron core 10. As the nonmagnetic metal, austenitic stainless steel, aluminum, copper, or the like can be used. Further, since metal has a higher thermal conductivity than resin, it has a high cooling effect and can prevent damage to bearing 18 due to temperature rise.

Embodiment 5 FIG.
Next, the fifth embodiment will be described with reference to FIGS. The first embodiment is similar to the first embodiment except that a nonmagnetic metal is used for the lower casing 15. Hereinafter, a description will be given with reference to FIG.

  In S51, the lower casing 15 is formed of a nonmagnetic metal. That is, the lower casing 15 is formed by plastic working using a nonmagnetic metal as a raw material. In S52, the shaft 27 is inserted into the lower casing shaft hole 15a. In S53, the gap between the shaft 27 and the lower casing shaft hole 15a is injection-molded with a thermoplastic resin, or filled with an adhesive, so that the gap is eliminated and the molding is performed integrally.

  Through the above steps, the backlash between the shaft 27 and the lower casing shaft hole 15a can be eliminated, the uneven wear and breakage of the bearing 18 can be prevented, and the efficiency and life of the pump 2 can be improved. Further, when the thermoplastic resin is injection-molded, an effect is obtained that it is easier to secure the fixing force between the shaft 27 and the lower casing 15 than the adhesion. Further, the material of the lower casing 15 is aluminum, an alumite treatment is performed to form fine holes on the surface around the lower casing shaft hole 15a, the shaft 27 is inserted into the lower casing shaft hole 15a, and then melted in this portion. The resin is injection molded. At this time, the anchor effect that the melted resin enters into the fine holes enables further strong bonding, the bonding strength between the shaft 27 and the lower casing 15 is further increased, and the high-power pump having a large inertial mass of the rotor portion 21 or the like. Can also be used.

Embodiment 6 FIG.
Next, the manufacturing method of the pump 2 of Embodiment 6 is demonstrated. FIG. 6 is a flow showing the main part of this manufacturing method.

(S61)
S61 is an insert process (second insert process). In S61, the lower casing 15 and the stator 17a, in which the outer peripheral surface of the shaft 27 and the inner peripheral surface of the lower casing shaft hole 15a are integrated with no gap, are inserted into a mold for molding.

(S62)
S62 is a molding process. In S62, by using the mold resin, the stator 17a inserted in the mold for molding is confined by the mold resin and the outer side of the hollow cylinder 15c of the lower casing 15 inserted in the mold for molding is An interface is formed with the mold resin.

  According to the manufacturing method shown in FIG. 7, since the adhesion between the lower casing 15 and the “mold resin 16 in a state where the stator 17a is confined” is improved, the lower casing 15 is prevented from being damaged due to stress such as a thermal cycle or water pressure. can do.

  In addition, by adopting PPS (polyphenylene sulfide) containing elastomer as the thermoplastic resin in the above first to sixth embodiments, the toughness is increased, the resin is prevented from cracking due to the thermal cycle or water pressure, and the life is increased. It becomes possible. Moreover, in above Embodiment 1-6, unsaturated polyester, an epoxy resin, etc. can be used as mold resin.

  In the above embodiment, the example of the pump 2 used when transporting and circulating the water in the heat pump apparatus 100 has been shown, but it can of course be used for home pumps and the like.

In the said Embodiment 1-6, the manufacturing method of the water circulation pump characterized by the following things, the water circulation pump, and the heat pump apparatus were demonstrated.
The axis,
A pump unit having a first casing formed with a first recess that restrains rotation of the shaft and receives one end of the shaft;
A stator portion having a second casing formed with a second recess for receiving the other end of the shaft by restraining rotation of the shaft, and a stator for rotating the rotor by electromagnetic interaction;
A rotor portion that is a rotor that has a bearing rotatably attached to the shaft, and a magnet portion that is fixedly attached to the bearing, and that is rotated by electromagnetic interaction with the stator of the stator portion; With
A gap between the outer peripheral surface of one end of the shaft and the inner peripheral surface of the first recess, and between the outer peripheral surface of the other end of the shaft and the inner peripheral surface of the second recess A water circulation pump, wherein at least one of the gaps is filled with a filler filling the gap.

The filler is classified as follows:
A water circulation pump comprising a predetermined resin and a predetermined adhesive.

At least one of the first casing and the second casing is:
A water circulation pump made of non-magnetic metal.

The axis,
A pump unit having a first casing formed with a first recess that restrains rotation of the shaft and receives one end of the shaft;
A stator portion having a second casing formed with a second recess for receiving the other end of the shaft by restraining rotation of the shaft, and a stator for rotating the rotor by electromagnetic interaction;
A rotor portion that is a rotor that has a bearing rotatably attached to the shaft, and a magnet portion that is fixedly attached to the bearing, and that is rotated by electromagnetic interaction with the stator of the stator portion; In the manufacturing method of the water circulation pump provided with
The other end of the shaft at a position corresponding to the second recess in the molding die for molding the second casing capable of inserting the other end of the shaft into a position corresponding to the second recess. A first insert step of inserting
By injecting a thermoplastic resin into a molding die of the second casing in which the other end of the shaft is inserted, the outer peripheral surface of the other end of the shaft and the inner periphery of the second recess A method of manufacturing a water circulation pump, comprising: an injection step of forming the second casing by integrating the surface with no gap.

The second casing is
A mold resin having a bottom and a hollow cylinder standing up from the bottom, the shaft and the rotor being housed in a space inside the hollow cylinder, and an outer side of the hollow cylinder confining the stator Form an interface between
The mold for molding the second casing is:
The mold resin enclosing the stator can be inserted,
The insert step is
Including the step of inserting the mold resin in which the stator is confined into the molding die of the second casing,
The injection process includes
A method for producing a water circulation pump, comprising: injecting the thermoplastic resin into the molding die in which the other end of the shaft and the mold resin confining the stator are inserted.

The second casing is
A mold resin having a bottom and a hollow cylinder standing up from the bottom, the shaft and the rotor being housed in a space inside the hollow cylinder, and an outer side of the hollow cylinder confining the stator Form an interface between
The method for manufacturing the water circulation pump further includes:
The second casing and the stator in which the outer peripheral surface of the other end of the shaft and the inner peripheral surface of the second recess are integrated without a gap are inserted into a mold for molding. A second insert step;
By using the molding resin, the stator inserted in the molding die is confined with molding resin, and the outside of the hollow cylinder of the second casing inserted in the molding die. The manufacturing method of the water circulation pump characterized by including the formation process which forms an interface between the side and said mold resin.

The thermoplastic resin is
A method for producing a water circulation pump, wherein the resin is PPS (polyphenylene sulfide) containing an elastomer.

A heat exchanger that exchanges heat between the refrigerant and water, or between water, a tank that stores water, and a water circulation pump that circulates water,
The water circulation pump is
The axis,
A pump unit having a first casing formed with a first recess that restrains rotation of the shaft and receives one end of the shaft;
A stator portion having a second casing formed with a second recess for receiving the other end of the shaft by restraining rotation of the shaft, and a stator for rotating the rotor by electromagnetic interaction;
A rotor portion that is a rotor that has a bearing rotatably attached to the shaft, and a magnet portion that is fixedly attached to the bearing, and that is rotated by electromagnetic interaction with the stator of the stator portion; With
A gap between the outer peripheral surface of one end of the shaft and the inner peripheral surface of the first recess, and between the outer peripheral surface of the other end of the shaft and the inner peripheral surface of the second recess A heat pump device characterized in that at least one of the gaps is filled with a filler that fills the gap.

  1 tank, 2 pump, 2a speed command signal, 3 heat exchanger, 4 water circuit, 5 refrigerant circuit, 6 water temperature detection means, 6a water temperature information, 7 water quantity control unit, 7a water temperature setting command signal, 8 water, 9 refrigerant, DESCRIPTION OF SYMBOLS 10 Iron core, 11 Winding, 12 Insulator, 13 Circuit board, 14 Lead wire, 15 Lower casing, 15a Lower casing shaft hole, 15b Bottom part, 15c Hollow cylinder, 15d Inner peripheral surface, 16 Mold resin, 17 Stator part, 17a Stator , 18 Bearing, 19 Wheel, 20 Magnet part, 21 Rotor part, 22 Water inlet, 23 Discharge port, 24 Upper casing, 24a Upper casing shaft hole, 25 Impeller, 26 Pump part, 27 Shaft, 28 Washer, 100 Heat pump device .

Claims (2)

The axis,
A pump unit having a first casing formed with a first recess that restrains rotation of the shaft and receives one end of the shaft;
A stator portion having a second casing formed with a second recess for receiving the other end of the shaft by restraining rotation of the shaft, and a stator for rotating the rotor by electromagnetic interaction;
A rotor portion that is a rotor that has a bearing rotatably attached to the shaft, and a magnet portion that is fixedly attached to the bearing, and that is rotated by electromagnetic interaction with the stator of the stator portion; In the manufacturing method of the water circulation pump provided with
The other end of the shaft at a position corresponding to the second recess in the molding die for molding the second casing capable of inserting the other end of the shaft into a position corresponding to the second recess. A first insert step of inserting
By injecting a thermoplastic resin into a molding die of the second casing in which the other end of the shaft is inserted, the outer peripheral surface of the other end of the shaft and the inner periphery of the second recess And an injection process for forming the second casing by integrating the surface with no gap,
The second casing is
A mold resin having a bottom and a hollow cylinder standing up from the bottom, the shaft and the rotor being housed in a space inside the hollow cylinder, and an outer side of the hollow cylinder confining the stator Form an interface between
The mold for molding the second casing is:
The mold resin enclosing the stator can be inserted,
The first insert step includes
Including the step of inserting the mold resin in which the stator is confined into the molding die of the second casing,
The injection process includes
Injecting the thermoplastic resin into the molding die in which the other end of the shaft and the mold resin confining the stator are inserted,
The thermoplastic resin is
A method for producing a water circulation pump, which is SPS (syndiotactic polystyrene). A heat pump device having a water circuit in which a tank, a water circulation pump, and a heat exchanger are arranged in the middle, and circulating water stored in the tank to the water circuit with the water circulation pump,
The water circulation pump is
A heat pump device manufactured by the method for manufacturing a water circulation pump according to claim 1.

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