JP4954269B2 - Pump and heat pump type hot water supply device - Google Patents

Description

  The present invention relates to a pump manufactured by combining a mold stator and a pump unit, and a method for manufacturing the pump. Furthermore, it is related with the heat pump type hot water supply apparatus using the pump.

  A shielding member is provided in the middle of a return path that returns from the outer periphery of the impeller to the suction mouth mouse through the gap between the front shroud and the pump case, and the shielding member is attached to one of the opposing surfaces facing the gap. There has been proposed an impeller structure of a pump that includes a moving part and a sliding contact part that is attached to the other side and is in sliding contact with the sliding part in a close contact state (see, for example, Patent Document 1).

JP 2008-240655 A

  However, since the pump of Patent Document 1 supports the shaft support portion serving as the rotation center of the rotor with a plurality of ribs extending from the suction port of the casing, the space for housing the shaft support portion is on the rotor side. Required near the impeller blade installation surface. This space becomes a stagnation region of the fluid flowing from the suction port to the discharge port. Details will be described in the embodiment.

  Further, since the shaft support portion is supported by a plurality of ribs extending from the suction port of the casing, the flow of the fluid flowing into the impeller is disturbed by the plurality of ribs.

  In addition, due to restrictions on the mold structure of the casing, the shaft support portion formed integrally with the casing needs to be smaller in the radial direction than the suction port. When the shaft support portion is smaller than the water inlet, the fluid flowing into the “stagnation region” increases, which may reduce the pump performance.

  The present invention has been made to solve the above-described problems, and it is possible to improve pump performance by performing rectification in the vicinity of the impeller suction portion while ensuring stable operation of the impeller. Provide a pump.

  Moreover, the manufacturing method of the pump is provided.

  Furthermore, the heat pump type hot water supply apparatus which mounts the pump is provided.

In the pump according to the present invention, a coil is formed by winding around a plurality of teeth provided with an insulating portion of a stator core, and an electronic component is mounted and a lead wire lead-out component that feeds out a lead wire is attached. A mold stator formed by molding a stator assembly assembled with a substrate with a mold resin;
A rotor having a casing having a fluid inlet and outlet and an annular groove formed around the inside of the inlet, and a rotor and an impeller is housed inside, and the rotor is slidable. A pump part formed by assembling a bowl-shaped partition wall part having a bowl-shaped partition wall part and a bowl-shaped partition part having a collar part;
A shaft to which one end is fixed to the shaft support portion of the bowl-shaped partition wall portion,
The rotor is
A sleeve bearing provided at the center of the rotor portion and slidably fitted to the other end of the shaft;
A substantially conical protrusion that is provided at the center portion of the impeller installation surface formed at the axial end of the rotor portion on the impeller side and guides the fluid flowing from the suction port to the impeller,
The impeller includes a substantially donut-shaped sliding portion that is accommodated in an annular groove provided around the inside of the suction port of the casing.

  The pump according to the present invention has a substantially conical protrusion that guides the fluid flowing from the suction port to the impeller at the center of the impeller installation surface formed at the axial end of the rotor portion on the impeller side. And the impeller includes a substantially donut-shaped sliding portion that is housed in an annular groove provided around the inside of the suction port of the casing, so that the impeller suction portion can be secured while ensuring stable operation of the impeller. Pump performance can be improved by performing rectification in the vicinity.

FIG. 3 shows the first embodiment and is a configuration diagram of a heat pump hot water supply apparatus 300. FIG. FIG. 3 is an exploded perspective view of the pump 10 showing the first embodiment. FIG. 5 shows the first embodiment and is a perspective view of a mold stator 50. FIG. 5 shows the first embodiment and is a cross-sectional view of a mold stator 50. FIG. 5 shows the first embodiment and is an exploded perspective view of the stator assembly 49; FIG. 5 is a diagram illustrating the first embodiment and is a diagram illustrating a pilot hole part 81 ((a) is a side view and (b) is a plan view). FIG. 5 shows the first embodiment, and is a perspective view of a stator assembly 49; FIG. 5 shows the first embodiment, and is an exploded perspective view of the pump unit 40; FIG. 3 shows the first embodiment, and is a cross-sectional view of the pump 10. FIG. 5 shows the first embodiment, and is a perspective view of the casing 41 as viewed from the shaft support portion 46 side. FIG. 5 shows the first embodiment and shows the manufacturing process of the pump 10. FIG. 5 shows the second embodiment, and shows the flow of fluid in the pump unit 40 of the first embodiment. FIG. 5 shows the second embodiment and is an exploded perspective view of the pump 410. FIG. FIG. 6 shows the second embodiment and is an exploded perspective view of a pump unit 440. FIG. FIG. 5 shows the second embodiment and is a cross-sectional view of a pump 410; FIG. 5 shows the second embodiment, and is a perspective view of the casing 441 viewed from the rotor 460 side. FIG. 5 shows the second embodiment and is a cross-sectional view of a rotor portion 460a. FIG. 6 shows the second embodiment, and is an exploded perspective view of a rotor 460. FIG. FIG. 6 shows the second embodiment and is a perspective view of an impeller 460b. FIG. 6 shows the second embodiment and is a perspective view of a rotor 460. FIG. FIG. 9 shows the second embodiment and is a top perspective view of the sliding portion 460c. FIG. 6 is a diagram illustrating the second embodiment, and is a bottom perspective view of a sliding portion 460c. FIG. 6 shows the second embodiment and is a top perspective view of an impeller portion 460d. FIG. 10 shows the second embodiment and is a bottom perspective view of the impeller portion 460d. FIG. 6 shows the second embodiment and is a top perspective view of the impeller 460b. FIG. 6 shows the second embodiment and is a bottom perspective view of the impeller 460b. FIG. 10 shows the second embodiment, and is a top perspective view of an impeller 560b of a first modification. FIG. 9 is a diagram illustrating the second embodiment, and is a bottom perspective view of an impeller 560b according to a first modification. FIG. 9 shows the second embodiment, and is a top perspective view of the sliding portion 560c of the first modification. FIG. 9 shows the second embodiment and is a bottom perspective view of the sliding portion 560c of the first modification. FIG. 12 is a diagram showing the second embodiment, and is a top perspective view of an impeller 660b according to a second modification. FIG. 9 is a diagram illustrating the second embodiment, and is a bottom perspective view of an impeller 660b according to a second modification. FIG. 10 is a diagram showing the second embodiment, and is a top perspective view of an impeller portion 660d of a second modification. FIG. 10 is a diagram illustrating the second embodiment, and is a bottom perspective view of an impeller portion 660d of a second modification. FIG. 10 shows the second embodiment, and is a partial cross-sectional view of a bowl-shaped partition wall component 490 in which a shaft 570 of a modified example is integrally formed. FIG. 9 shows the second embodiment and shows the manufacturing process of the pump 410.

Embodiment 1 FIG.
In the present embodiment, the pilot hole part in which the mold stator is assembled to the stator is integrally formed with mold resin, and at this time, the pilot hole for the tapping screw in the foot part of the pilot hole part is exposed, and the pump part The pump portion and the mold stator are fastened and assembled to the pilot hole with a tapping screw through the screw holes formed in the screw hole, so that the pump portion and the mold stator are firmly assembled.

  1 to 11 show the first embodiment. FIG. 1 is a configuration diagram of a heat pump hot water supply apparatus 300, FIG. 2 is an exploded perspective view of the pump 10, FIG. 3 is a perspective view of a mold stator 50, and FIG. 5 is a sectional view of the mold stator 50, FIG. 5 is an exploded perspective view of the stator assembly 49, FIG. 6 is a view showing a pilot hole part 81 ((a) is a side view, (b) is a plan view), and FIG. FIG. 8 is an exploded perspective view of the pump unit 40, FIG. 9 is a sectional view of the pump 10, FIG. 10 is a perspective view of the casing 41 viewed from the shaft support unit 46 side, and FIG. It is a figure which shows the manufacturing process of this.

  First, an outline of a heat pump type hot water supply apparatus in which a pump is used will be briefly described.

  As shown in FIG. 1, it is a configuration diagram of a heat pump hot water supply apparatus 300. The heat pump hot water supply apparatus 300 includes a heat pump unit 100, a tank unit 200, and an operation unit 11 on which a user performs a driving operation.

  In FIG. 1, a heat pump unit 100 includes a compressor 1 that compresses refrigerant, a refrigerant-water heat exchanger 2 that exchanges heat between the refrigerant and water, a decompression device 3 that decompresses and expands high-pressure refrigerant, and a low-pressure two-phase refrigerant. A refrigerant circuit in which the evaporator 4 for evaporating the refrigerant is annularly connected by a refrigerant pipe 15, a pressure detection device 5 that detects the discharge pressure of the compressor 1, a fan 7 that blows air to the evaporator 4, and the fan 7 are driven. And a fan motor 6.

  Further, as temperature detecting means, a boiling temperature detecting means 8 of the refrigerant-water heat exchanger 2, a feed water temperature detecting means 9 of the refrigerant-water heat exchanger 2, and an outside air temperature detecting means 17 are provided.

  Moreover, the heat pump unit control part 13 is provided. The heat pump unit controller 13 receives signals from the pressure detector 5, the boiling temperature detector 8, the feed water temperature detector 9, and the outside air temperature detector 17, and controls the rotation speed of the compressor 1 and the decompressor 3. The opening degree control and the rotation speed control of the fan motor 6 are performed.

  The tank unit 200 includes a hot water tank 14 that stores hot water heated by exchanging heat with a high-temperature and high-pressure refrigerant in the refrigerant-water heat exchanger 2, and a bath water reheating heat exchanger that replenishes the bath water. 31, bath water circulation device 32, pump 10 which is a hot water circulation device arranged between refrigerant-water heat exchanger 2 and hot water tank 14, hot water circulation pipe 16, refrigerant-water heat exchanger 2 and hot water. A mixing valve 33 connected to the tank 14 and the bath water reheating heat exchanger 31 and a bath water retreating pipe 37 for connecting the hot water tank 14 and the mixing valve 33 are provided.

  Further, as temperature detection means, a tank water temperature detection device 34, a water temperature detection device 35 for detecting the water temperature after passing through the bath water reheating heat exchanger, and a water temperature after passing through the mixing valve 33 are detected. A post-mixing water temperature detector 36 is provided.

  A tank unit controller 12 is also provided. The tank unit controller 12 receives signals from the in-tank water temperature detection device 34, the reheating water temperature detection device 35, and the mixed water temperature detection device 36, and controls the rotational speed of the pump 10, the opening and closing control of the mixing valve 33, In addition, signals are transmitted to and received from the operation unit 11.

  The operation unit 11 is a remote controller, an operation panel, or the like provided with a switch or the like for the user to perform hot water temperature setting, hot water instruction, and the like.

  In FIG. 1, a normal boiling operation operation in the heat pump type hot water supply apparatus configured as described above will be described. When the boiling operation instruction from the operation unit 11 or the tank unit 200 is transmitted to the heat pump unit control unit 13, the heat pump unit 100 performs the boiling operation.

  The heat pump unit controller 13 provided in the heat pump unit 100 controls the rotational speed of the compressor 1 and the decompression device 3 based on the detection values of the pressure detection device 5, the boiling temperature detection means 8, the feed water temperature detection means 9, and the like. The opening degree control and the rotation speed control of the fan motor 6 are performed.

  Further, the detection value of the boiling temperature detection means 8 is transmitted and received between the heat pump unit control unit 13 and the tank unit control unit 12, and the tank unit control unit 12 sets the temperature detected by the boiling temperature detection means 8 as the target. The rotation speed of the pump 10 is controlled so as to reach the boiling temperature.

  In the heat pump type hot water supply apparatus 300 controlled as described above, the temperature of the high-temperature and high-pressure refrigerant discharged from the compressor 1 decreases while dissipating heat to the water supply circuit side in the refrigerant-water heat exchanger 2. The high-pressure and low-temperature refrigerant that has radiated heat and passed through the refrigerant-water heat exchanger 2 is decompressed by the decompression device 3. The refrigerant that has passed through the decompression device 3 flows into the evaporator 4 where it absorbs heat from outside air. The low-pressure refrigerant exiting the evaporator 4 is sucked into the compressor 1 and circulates to form a refrigeration cycle.

  On the other hand, the water in the lower part of the hot water tank 14 is guided to the refrigerant-water heat exchanger 2 by driving the pump 10 which is a hot water circulation device. Here, water is heated by the heat radiation from the refrigerant-water heat exchanger 2, and the heated hot water is returned to the upper part of the hot water tank 14 through the hot water circulation pipe 16 and stored.

  As described above, in the heat pump hot water supply apparatus 300, the pump 10 is used as a hot water circulation apparatus that circulates hot water in the hot water circulation pipe 16 between the hot water tank 14 and the refrigerant-water heat exchanger 2.

  Next, the pump 10 used as a hot water circulation device will be described.

  As shown in FIG. 2, the pump 10 includes a pump unit 40 that sucks and discharges water by rotation of a rotor (described later), a mold stator 50 that drives the rotor, a pump unit 40, and a mold stator. And tapping screws 160 (four in the example of FIG. 2) that are fastening screws that fasten 50.

  In the pump 10 according to the present embodiment, four tapping screws 160 are prepared through the screw holes 44 a formed in the boss portion 44 of the pump portion 40, and the pilot holes 84 of the pilot hole component 81 embedded in the mold stator 50. The pump 10 is assembled by fastening to (refer FIG. 4).

  First, the configuration of the mold stator 50 will be described.

  As shown in FIGS. 3 and 4, the mold stator 50 is obtained by molding a stator assembly 49 (described later) with a mold resin 53.

  One end face (on the pump part 40 side) in the axial direction of the mold stator 50 is a flat pump part installation surface 63 along the outer peripheral edge part.

  A plurality of second grooves 64 are formed radially on the pump portion installation surface 63 in the radial direction. The second groove 64 is a relief groove for a reinforcing rib of a flange portion 90b (see FIG. 8) of the flange-shaped partition wall component 90 described later. In the example of FIG. 3, six second grooves 64 are formed at substantially equal intervals in the circumferential direction corresponding to reinforcing ribs of the flange portion 90 b of the flange-shaped partition wall component 90 described later.

  The pump portion installation surface 63 is provided with an annular third groove 65 that connects the outer end portions of the six second grooves 64. The annular third groove 65 corresponds to an annular rib formed in the flange portion 90 b of the flange-shaped partition wall component 90.

  Furthermore, foot portions 85 (see FIG. 6) of pilot hole parts 81 of substantially cylindrical resin molded products are embedded in the four corners of the pump portion installation surface 63 in the axial direction. At the time of molding with the mold resin 53, one end face (the pump part 40 side) of the foot part 85 of the pilot hole part 81 becomes a mold pressing part 82 (see FIG. 4) of the molding die. Therefore, the pilot hole part 81 is exposed in a form embedded inside the pump part installation surface 63 by a predetermined distance. What is exposed is a mold retainer 82 and a pilot hole 84 for the tapping screw 160.

  A lead wire 52 drawn from a stator assembly 49 to be described later is drawn to the outside from the vicinity of the axial end surface on the opposite side of the pump portion 40 of the mold stator 50.

  The axial positioning of the mold stator 50 during molding with the mold resin 53 (thermosetting resin) is performed on the axially outer end faces of the plurality of protrusions 95a formed on the substrate pressing component 95 (see FIG. 7). However, it becomes the upper mold holder. Therefore, the axially outer end surfaces (die pressing surfaces) of the plurality of protrusions 95a are exposed on the axial end surface of the mold stator 50 on the substrate 58 side (not shown).

  Further, a protrusion 56a (see FIGS. 5 and 7) extending further outward (in the axial direction) than the axial end face of the insulating portion 56 on the anti-connection side is a lower mold pressing portion. Therefore, a plurality of protrusions 56a are exposed on the axial end surface of the mold stator 50 opposite to the substrate 58 (not shown).

  The radial positioning of the mold stator 50 at the time of molding is performed by fitting the inner peripheral surface of the stator core 54 to the mold. Therefore, the tips of the teeth of the stator core 54 are exposed at the inner peripheral portion of the mold stator 50 shown in FIGS.

  Regarding the internal structure of the mold stator 50, that is, the stator assembly 49 (lead wire 52, stator core 54, insulating portion 56, coil 57, substrate 58, terminal 59, etc. shown in FIG. 4) and pilot hole component 81. Will be described later.

  Next, the stator assembly 49 will be described. As shown in FIGS. 5 and 7, the stator assembly 49 includes a stator 47 and a pilot hole part 81.

The stator assembly 49 is manufactured by the following procedure.
(1) An electromagnetic steel sheet having a thickness of about 0.1 to 0.7 mm is punched into a band shape, and a band-shaped stator core 54 laminated by caulking, welding, bonding or the like is manufactured. The strip-shaped stator core 54 includes a plurality of teeth. The tips of the teeth of the stator core 54 are exposed at the inner periphery of the mold stator 50 shown in FIG. Since the stator core 54 shown here has six teeth connected by thin-walled connecting portions, the tips of the teeth of the stator core are exposed at six locations also in FIG. However, only two locations are visible in FIG.
(2) An insulating portion 56 is applied to the teeth of the stator core 54. The insulating portion 56 is formed integrally with or separately from the stator core 54 using, for example, a thermoplastic resin such as PBT (polybutylene terephthalate).
(3) A concentrated coil is wound around the teeth provided with the insulating portion 56. Six concentrated winding coils 57 are connected to form a three-phase single Y-connection winding.
(4) Since it is a three-phase single Y connection, a terminal 59 (power supply) to which a coil 57 (see FIG. 4) of each phase (U phase, V phase, W phase) is connected on the connection side of the insulating portion 56 Power supply terminal and neutral point terminal) are assembled. There are three power terminals and one neutral point terminal.
(5) The board | substrate 58 is attached to the insulation part 56 (side in which the terminal 59 is assembled | attached) on the connection side. The substrate 58 is sandwiched between the insulating portion 56 by the substrate pressing component 95. On the substrate 58, an IC 58a (driving element) for driving an electric motor (brushless DC motor), a Hall element (position detecting element) for detecting the position of the rotor 60, and the like are mounted. The IC 58a and the Hall element are defined as electronic components. In addition, a lead wire lead-out component 61 that leads out the lead wire 52 to a notch near the outer peripheral edge portion is attached to the substrate 58.
(6) The board 58 to which the lead wire lead-out part 61 is attached is fixed to the insulating portion 56 by the board pressing part 95, and the pilot hole part 81 is assembled to the stator 47 to which the terminal 59 and the board 58 are soldered. Thus, the stator assembly 49 is completed.

  The configuration of the pilot hole part 81 will be described with reference to FIGS. The pilot hole part 81 is formed by molding a thermoplastic resin such as PBT (polybutylene terephthalate).

  As shown in FIG. 6, a plurality of substantially cylindrical foot portions 85 each having a pilot hole 84 for the tapping screw 160 are connected by a thin connecting portion 87. After the pilot hole part 81 is molded together with the stator 47, the substantially cylindrical leg part 85 is formed so that the pilot hole part 81 is prevented from coming off, and the exposed end surface (the mold presser part 82 and the protrusion) 83 end portion) is a taper shape that becomes thicker.

  In addition, the pilot hole part 81 includes a plurality of protrusions 85 a for preventing rotation of the pilot hole part 81 on the outer peripheral part of the foot part 85. The pilot hole part 81 can be set in a mold at once by connecting the substantially cylindrical foot 85 with a thin connecting part 87, so that the processing cost can be reduced.

  As shown in FIGS. 5 and 7, the connecting portion 87 of the pilot hole part 81 is provided with a plurality of claws 86 for assembling the pilot hole part 81 to the stator 47. In the example of FIG. 5, two claws 86 are provided.

  By fixing the claw 86 of the pilot hole part 81 in the groove 54a formed in the outer peripheral portion of the stator core 54 of the stator 47, the stator 47 and the pilot hole part 81 are set in the mold once. If possible, the processing cost can be reduced.

  When the stator assembly 49, in which the pilot hole part 81 is locked to the stator 47, is molded by the mold resin 53, the end face on the opening side of the pilot hole 84 for the tapping screw 160 of the pilot hole part 81 (die holding part 82) And the protrusion 83 (refer FIG. 4) with which the other end surface of the pilot hole part 81 is clamped with a molding die, and the axial direction positioning of the pilot hole part 81 is performed.

  The outer diameter of the mold pressing portion 82 on the opening side end face of the lower hole 84 for the tapping screw 160 of the lower hole part 81 is made smaller than the outer diameter of the end face on the opening side of the lower hole part 81. As a result, the end surface of the pilot hole part 81 is covered with the mold resin 53 except for the mold pressing portion 82. Therefore, since both end surfaces of the pilot hole component 81 are covered with the mold resin 53, it is possible to suppress the exposure of the pilot hole component 81 and improve the quality of the pump 10.

  In the mold stator 50, the pilot hole part 81 assembled to the stator 47 is integrally formed with the mold resin 53, and at this time, the pilot hole 84 for the tapping screw 160 of the foot portion 85 of the pilot hole part 81 is exposed. To do. The pump unit 40 and the mold stator 50 are fastened and assembled to the pilot hole 84 with the tapping screw 160 through the screw hole 44a formed in the pump unit 40, and the pump unit 40 and the mold stator 50 are assembled. It can be firmly assembled.

  In addition, although not shown in the drawings, in order to firmly attach the pump unit 40 and the mold stator 50, as an alternative to the pilot hole part 81, a metal made of protrusions for preventing slipping and rotation prevention on the outer periphery is provided. It is also possible to use an insert nut having a screw hole. Changes in the type and mounting position of the pilot hole part 81 or the insert nut can be handled by changing the mounting part of the mold. When using an insert nut having a screw hole, a tightening screw is used.

Next, the configuration of the pump unit 40 will be described. As shown in FIGS. 8 and 9, the pump unit includes the following elements.
(1) A casing 41 having a water suction port 42 and a discharge port 43 and housing the impeller 60b of the rotor 60 therein: The casing 41 is molded using a thermoplastic resin such as PPS (polyphenylene sulfide). Is done. The casing 41 is provided with four boss portions 44 having screw holes 44a used for assembling the pump portion 40 and the mold stator 50 at the end on the suction port 42 side. Moreover, the casing 41 is provided with the attachment leg 45 which has the hole 45a for fixing the pump 10 to the tank unit 200 of the heat pump type hot-water supply apparatus 300, for example in three places.
(2) First thrust bearing 71a: The material of the first thrust bearing 71a is, for example, ceramic such as alumina. Since the rotor 60 is pressed against the casing 41 via the first thrust bearing 71a by the pressure difference of water acting on the front and back of the impeller 60b of the rotor 60 during the operation of the pump 10, the first thrust bearing 71a The one made of ceramic is used to ensure wear resistance and slidability.
(3) Rotor 60: The rotor 60 includes a rotor portion 60a and an impeller 60b. The rotor portion 60a includes a ring-shaped (cylindrical) resin magnet 68 formed by pelletizing a magnetic powder such as ferrite and a resin, and a cylindrical sleeve bearing 66 (for example, carbon) provided inside the resin magnet 68. Are integrated with a resin 67 such as PPE (polyphenylene ether) (see FIG. 9). The impeller 60b is a resin molded product such as PPE (polyphenylene ether). The rotor part 60a and the impeller 60b are joined by ultrasonic welding or the like.
(4) Shaft 70: One end of the shaft 70 is inserted into the shaft support portion 94 of the bowl-shaped partition wall component 90, and the other end of the shaft 70 is inserted into the shaft support portion 46 of the casing 41. One end of the shaft 70 inserted into the shaft support portion 94 of the bowl-shaped partition wall component 90 is inserted so as not to rotate with respect to the shaft support portion 94. Therefore, one end of the shaft 70 is cut out of a part of a circle having a predetermined length (axial direction) (D-shape). The hole of the shaft support portion 94 is also shaped accordingly. The other end of the shaft 70 inserted into the shaft support portion 46 (see also FIG. 10) of the casing 41 is also cut out of a circular portion having a predetermined length (axial direction) (D-shape). That is, the axis 70 is symmetrical in the length direction. However, the other end of the shaft 70 is rotatably inserted into the shaft support portion 46 of the casing 41. The reason why the shaft 70 is symmetrical in the length direction is that when the shaft 70 is inserted into the shaft support portion 94 of the bowl-shaped partition wall component 90, assembly is possible without being aware of the vertical direction.
(5) Second thrust bearing 71b: The material of the second thrust bearing 71b is SUS. The rotor 60 is pressed against the casing 41 via the first thrust bearing 71a by the pressure difference of water acting on the front and back of the impeller 60b of the rotor 60 during the operation of the pump 10, but depending on the operation state, the rotor 60 may rotate. Since the case where the child 60 contacts the shaft support portion 94 of the bowl-shaped partition wall component 90 via the second thrust bearing 71b is also conceivable, the second thrust bearing 71b is used.
(6) O-ring 80: The O-ring 80 seals the casing 41 of the pump unit 40 and the bowl-shaped partition wall component 90.
(7) Cage-like partition wall part 90: Cage-like partition wall part 90 is molded using a thermoplastic resin such as PPE (polyphenylene ether). The bowl-shaped partition wall component 90 includes a bowl-shaped partition wall portion 90 a that is a fitting portion with the mold stator 50 and a flange portion 90 b. The bowl-shaped partition wall 90a is composed of a circular bottom and a cylindrical partition. A shaft support portion 94 into which one end of the shaft 70 is inserted is erected at a substantially central portion of the inner surface of the circular bottom portion. Ribs 91 extending in the axial direction are formed on the outer peripheral surface of the bowl-shaped partition wall 90a. The rib 91 is formed to have a predetermined length in the axial direction from the base of the flange-shaped partition wall portion 90a (the connection portion with the flange portion 90b). And the dimension of the radial direction of the rib 91 is a taper shape in which the base side of the bowl-shaped partition part 90a is large, and becomes small as it goes ahead. In the flange portion 90b, six reinforcing ribs (not shown) that reinforce the flange portion 90b are formed radially in the radial direction. The rib 91 of the bowl-shaped partition wall 90a is connected to any one of the reinforcing ribs. Thereby, manufacture of the shaping die of the bowl-shaped partition part 90 becomes easy. In addition, the flange portion 90 b includes an annular rib (not shown) that fits in an annular third groove 65 formed on the pump portion installation surface 63 of the pump portion 40 of the mold stator 50. In addition, holes 90d through which the tapping screw 160 passes are formed in the flange portion 90b at four locations. Furthermore, an annular O-ring storage groove 90c for storing the O-ring 80 is formed on the surface of the flange portion 90b on the casing 41 side.

  In the pump 10, the O-ring 80 is installed in the bowl-shaped partition wall part 90, the casing 41 is assembled to the bowl-shaped partition wall part 90, the pump part 40 is assembled, the pump part 40 is assembled to the mold stator 50, and the tapping screw 160 or the like. Fixed and assembled.

  When the mold stator 50 and the pump unit 40 are assembled, the first groove 51 formed in the axial direction on the inner periphery of the mold stator 50 and the bowl-shaped partition wall 90 a of the bowl-shaped partition wall component 90 are formed. When the rib 91 extending in the axial direction is fitted to the outer peripheral surface, positioning in the rotational direction (circumferential direction) is performed (see FIG. 9).

  The mold stator 50 and the pump unit 40 are fitted as follows. Since the rib 91 is not provided on the part of the outer peripheral surface of the bowl-shaped partition wall part 90a opposite to the collar part 90b, the rib-shaped partition wall part 90a of the pump part 40 is provided on the inner periphery of the mold stator 50. The tip (portion without the rib 91) can be inserted at an arbitrary position.

  When the insertion progresses and the rib 91 of the bowl-shaped partition wall 90a of the pump unit 40 reaches the end on the opening side of the inner periphery of the mold stator 50, an axial direction is formed on the inner periphery of the mold stator 50. If the first groove 51 and the rib 91 extending in the axial direction are not aligned with the outer peripheral surface of the hook-shaped partition wall portion 90a of the hook-shaped partition wall component 90, further insertion is not possible. Since the bowl-shaped partition wall 90a of the pump unit 40 is inserted, the first groove 51 and the rib 91 can be easily aligned by rotating.

  If the positions of the first groove 51 and the rib 91 are aligned, the bowl-shaped partition wall portion 90 a of the pump unit 40 can be completely inserted into the inner periphery of the mold stator 50.

  On the inner periphery of the bowl-shaped partition wall portion 90 a of the bowl-shaped partition wall component 90, the rotor 60 is fitted and accommodated on the shaft 70 inserted into the shaft support portion 94 of the bowl-shaped partition wall component 90. Therefore, in order to ensure the coaxiality of the mold stator 50 and the rotor 60, the gap between the inner periphery of the mold stator 50 and the outer periphery of the bowl-shaped partition wall portion 90a of the bowl-shaped partition wall component 90 should be as small as possible. For example, the gap is selected to be about 0.02 to 0.06 mm.

  When the gap between the inner periphery of the mold stator 50 and the outer periphery of the bowl-shaped partition wall portion 90a of the bowl-shaped partition wall component 90 is reduced, the bowl-shaped partition wall portion 90a of the bowl-shaped partition wall component 90 is inserted into the inner periphery of the mold stator 50. In some cases, insertion is difficult if there is no way for air to escape.

  Therefore, the first groove 51 formed in the axial direction is provided in the inner peripheral portion of the mold stator 50, and the first groove 51 is used as an air escape path.

  Further, circumferential positioning of the bowl-shaped partition wall component 90 and the mold stator 50 is necessary.

  In order to position the bowl-shaped partition wall component 90 and the mold stator 50 in the circumferential direction, the ribs of the bowl-shaped partition wall section 90a are formed in the first groove 51 formed in the axial direction on the inner circumference of the mold stator 50. 91 is fitted.

  If the ribs 91 of the bowl-shaped partition wall portion 90a block the first groove 51 of the mold stator 50, which is an air escape path, it becomes difficult to insert the bowl-shaped partition wall component 90 into the mold stator 50. Therefore, in a state where the bowl-shaped partition wall component 90 is completely inserted into the mold stator 50, a gap is formed between the first groove 51 of the mold stator 50 and the rib 91 of the bowl-shaped partition wall portion 90a. Yes. The gap is about 1 mm at the narrowest place (where the radial dimension of the rib 91 is the largest).

  As described above, the gap between the inner periphery of the mold stator 50 and the outer periphery of the bowl-shaped partition wall portion 90a of the bowl-shaped partition wall component 90 is made as small as possible (for example, about 0.02 to 0.06 mm), and the mold stator 50 rotates. A first groove 51 serving as an air escape path formed in the axial direction is provided in the inner peripheral portion of the mold stator 50 while ensuring the coaxiality with the child 60, so that the inner periphery of the mold stator 50 is provided. It is easy to insert the bowl-shaped partition wall component 90. Further, a rib 91 having a predetermined length is formed in the bowl-shaped partition wall portion 90a in the axial direction from the root of the bowl-shaped partition wall portion 90a (the connecting portion with the flange portion 90b). The base portion 90a is large and has a tapered shape that decreases as it goes forward, and the rib 91 is fitted in the first groove 51 of the mold stator 50 with a predetermined radial gap (about 1 mm). Therefore, the mold stator 50 and the bowl-shaped partition wall component 90 can be positioned, and the mold stator 50 and the bowl-shaped partition wall component 90 can be easily assembled.

The manufacturing process of the pump 10 will be described with reference to FIG.
(1) Step 1: The stator 47 is manufactured. First, an electromagnetic steel plate having a thickness of about 0.1 to 0.7 mm is punched into a strip shape, laminated by caulking, welding, adhesion, or the like, and a strip-shaped stator core 54 connected by a thin connection portion is manufactured. The teeth are provided with an insulating portion 56 using a thermoplastic resin such as PBT (polybutylene terephthalate). A concentrated winding coil 57 is wound around the teeth provided with the insulating portion 56. For example, six concentrated winding coils 57 are connected to form a three-phase single Y-connection winding. Since it is a three-phase single Y connection, a terminal 59 (a power supply terminal to which power is supplied and a middle terminal) to which a coil 57 of each phase (U phase, V phase, W phase) is connected is connected to the connection side of the insulating portion 56 Sex point terminal) is assembled. In addition, the substrate 58 is manufactured. The board | substrate 58 is clamped between the insulation parts 56 by the board | substrate holding | suppressing component. On the substrate 58, an IC 58a for driving an electric motor (brushless DC motor), a hall element 58b for detecting the position of the rotor 60, and the like are mounted. In addition, a lead wire lead-out component 61 that leads out the lead wire 52 to a notch near the outer peripheral edge portion is attached to the substrate 58. In addition, the rotor part 60a is manufactured. The rotor portion 60a includes a ring-shaped (cylindrical) resin magnet 68 formed by pelletizing a magnetic powder such as ferrite and a resin, and a cylindrical sleeve bearing 66 (for example, carbon) provided inside the resin magnet 68. For example, PPE (polyphenylene ether). At the same time, the impeller 60b is formed. The impeller 60b is molded using a thermoplastic resin such as PPE (polyphenylene ether).
(2) Step 2: Assemble the substrate 58 to the stator 47. The substrate 58 to which the lead wire lead-out component 61 is attached is fixed to the insulating portion 56 by the substrate holding component. At the same time, the impeller 60b is assembled to the rotor portion 60a by ultrasonic welding or the like. In addition, the bowl-shaped partition wall component 90 is formed. In addition, the shaft 70, the first thrust bearing 71a, and the second thrust bearing 71b are manufactured. The shaft 70 is manufactured from SUS. The first thrust bearing 71a is made of ceramic. The second thrust bearing 71b is manufactured from SUS.
(3) Step 3: Solder the terminal 59 (the power supply terminal to which power is supplied and the neutral point terminal) and the substrate 58. By assembling the pilot hole part 81 to the stator 47, the stator assembly 49 is completed. The rotor 60 and the like are assembled to the bowl-shaped partition wall component 90. In addition, the casing 41 is molded together. The casing 41 is molded using a thermoplastic resin such as PPS (polyphenylene sulfide).
(4) Step 4: The stator assembly 49 is molded to manufacture the mold stator 50. In addition, the pump 41 is assembled by fixing the casing 41 to the bowl-shaped partition wall component 90. In addition, a tapping screw 160 is also manufactured.
(5) Step 5: The pump 10 is assembled. The pump unit 40 is assembled to the mold stator 50 and fixed with a tapping screw 160. When assembling the mold stator 50 and the pump unit 40, the first groove 51 provided on the inner diameter of the mold stator 50 and the bowl-shaped partition wall portion 90 a having the inner diameter of the mold stator 50 of the bowl-shaped partition wall component 90 are provided. When the rib 91 is fitted, positioning with respect to the rotation direction is performed.

Embodiment 2. FIG.
In the present embodiment, a pump 410 obtained by further improving the pump 10 of the first embodiment will be described.

  12 to 36 are diagrams showing the second embodiment. FIG. 12 is a diagram showing the flow of fluid in the pump unit 40 of the first embodiment. FIG. 13 is an exploded perspective view of the pump 410. FIG. 15 is a sectional view of the pump 410, FIG. 16 is a perspective view of the casing 441 viewed from the rotor 460 side, FIG. 17 is a sectional view of the rotor portion 460a, and FIG. 18 is an exploded perspective view of the rotor 460. 19 is a perspective view of the impeller 460b, FIG. 20 is a perspective view of the rotor 460, FIG. 21 is a top perspective view of the sliding portion 460c, FIG. 22 is a bottom perspective view of the sliding portion 460c, and FIG. 24 is a top perspective view of the impeller portion 460d, FIG. 25 is a top perspective view of the impeller 460b, FIG. 26 is a bottom perspective view of the impeller 460b, and FIG. FIG. 28 is a top perspective view of the car 560b. 29 is a bottom perspective view of the impeller 560b of Example 1, FIG. 29 is a top perspective view of the sliding portion 560c of Modification 1, FIG. 30 is a bottom perspective view of the sliding portion 560c of Modification 1, and FIG. 32 is a top perspective view of the impeller 660b, FIG. 32 is a bottom perspective view of the impeller 660b of Modification 2, FIG. 33 is a top perspective view of the impeller 660d of Modification 2, and FIG. 34 is an impeller 660d of Modification 2. FIG. 35 is a partial cross-sectional view of a bowl-shaped partition wall part 490 integrally formed with a shaft 570 of a modified example, and FIG. 36 is a diagram showing a manufacturing process of the pump 410.

With reference to FIG. 12, the flow of fluid in the pump unit 40 of the first embodiment will be described. As shown by the arrows in FIG. 12, the fluid (for example, water) is sucked into the impeller 60 b (impeller) from the suction port 42 of the casing 41 and discharged from the discharge port 43 (see FIG. 9). At this time, when the following points are improved, the pump unit 40 according to the first embodiment further rectifies the vicinity of the suction unit of the impeller 60b while ensuring stable operation of the impeller 60b. The performance can be improved.
(1) Since a plurality of ribs 48 (see FIG. 10) extending from the suction port 42 of the casing 41 support the shaft support portion 46 of the shaft 70 that serves as the rotation center of the rotor 60, the shaft support portion 46 is accommodated. Space is required on the rotor 60 side. This space becomes a “stagnation region” of the fluid flowing from the suction port 42 to the discharge port 43, and there is a possibility that the pump performance may be reduced. The “stagnation area” is indicated by hatching in FIG.
(2) Since the shaft support portion 46 is supported by a plurality of ribs 48 (for example, three) extending from the suction port 42 of the casing 41, the flow of fluid flowing into the impeller 60b is disturbed by the plurality of ribs 48. Occurs.
(3) The shaft support portion 46 formed integrally with the casing 41 needs to be smaller than the suction port 42 due to restrictions on the mold structure at the time of resin molding of the casing 41. If the shaft support portion 46 is smaller than the suction port 42, the fluid flowing into the “stagnation region” increases, which may reduce the pump performance.
(4) Since there is a gap between the casing 41 and the annular convex portion 60d (see FIG. 8) protruding from the end of the impeller 60b on the casing 41 side, the fluid exiting the impeller 60b flows back through the gap. (Indicated by a narrow arrow in FIG. 12). As a result, the pump performance may be reduced.

  In this embodiment, by improving (1) to (4) of the first embodiment and ensuring stable operation of the impeller 60b, rectification in the vicinity of the suction portion of the impeller 60b is performed. Further, the pump performance is improved.

  As shown in FIG. 13, a pump 410 includes a pump unit 440 that sucks and discharges water by rotation of a rotor (described later), a mold stator 450 that drives the rotor, a pump unit 440, and a mold stator. Tapping screws 560 (four in the example of FIG. 13) that are fastening screws that fasten 450 are provided.

  In the pump 410 according to the present embodiment, four tapping screws 560 are prepared through pilot holes 481 formed in the boss portion 444 of the pump portion 440 through pilot holes 481 of the pilot hole component 481 embedded in the mold stator 450 ( The pump 410 is assembled by fastening to the same as the pilot hole 84 in FIG.

  The mold stator 450 and the tapping screw 560 are the same as the mold stator 50 and the tapping screw 160 of the first embodiment.

The configuration of the pump unit 440 is different from the pump unit 40 of the first embodiment. As shown in FIG. 14, the pump unit 440 includes the following elements.
(1) A casing 441 having a water suction port 442 and a discharge port 443 and housing the impeller 460b of the rotor 460 therein;
(2) Thrust bearing 471;
(3) Rotor 460;
(4) shaft 470;
(5) O-ring 480;
(6) A bowl-shaped partition wall part 490.

  Hereinafter, each element which comprises the pump part 440 of (1)-(6) is demonstrated in order.

  The casing 441 will be described with reference to FIGS. The casing 441 is generally rectangular in plan view, and a suction port 442 is formed at the center thereof, and a discharge port 443 is formed in the direction orthogonal to the suction port 442 near the corner of one side of the square.

  The casing 441 is molded using a thermoplastic resin such as PPE (polyphenylene ether). The casing 441 is provided with four boss portions 444 having screw holes 445a used when assembling the pump portion 440 and the mold stator 450 on the end surface on the suction port 442 side.

  The casing 441 includes mounting legs 445 having screw holes 445a for fixing the pump 410 to the tank unit 200 of the heat pump hot water supply apparatus 300, for example.

  As shown in FIGS. 15 and 16, the casing 441 is provided with an annular groove portion 448 that houses the thrust bearing 471 at the substantially central portion on the end surface opposite to the suction port 442.

  As shown in FIG. 14, the thrust bearing 471 has a substantially donut shape, is made of a material such as a thermoplastic resin obtained by adding carbon fiber or the like to PPS, or a ceramic such as alumina, and is provided inside the casing 441. It is installed in an annular groove 448 (see FIGS. 15 and 16).

  The thrust bearing 471 is a sliding portion of an impeller 460b assembled to a rotor 460 driven by the action of a rotating magnetic field generated by a current flowing in a mold stator 450 (not shown, the same as the mold stator 50). 460c (see FIGS. 14, 18, and 19) is in sliding contact. By doing so, while ensuring the stable rotation operation | movement of the impeller 460b, the recirculation | reflux path | route (refer FIG. 12) of the fluid between the impeller 460b and the casing 441 is shielded, and the circulation amount (short cycle) inside a pump chamber ) Can be reduced.

  The rotor 460 will be described with reference to FIGS. 14 to 34 (excluding FIG. 16). The rotor 460 includes a rotor part 460a and an impeller 460b, and the rotor part 460a and the impeller 460b are joined by ultrasonic welding or the like.

As shown in FIG. 17, the rotor part 460a includes at least the following elements.
(1) Resin magnet 468;
(2) sleeve bearing 466;
(3) Thermoplastic resin 467.

  The resin magnet 468 has a ring shape (cylindrical shape) and is formed of pellets obtained by kneading a magnetic powder such as ferrite and a resin.

  The sleeve bearing 466 (for example, made of carbon) is provided inside the resin magnet 468. The sleeve bearing 466 is provided with an opening 466a for inserting the shaft 470 on one end surface (the side opposite to the projection 460a-1 in FIG. 17), and the other end surface (the projection 460a-1 side in FIG. 17) is closed. It is cylindrical.

  For example, a resin magnet 468 and a sleeve bearing 466 (for example, made of carbon) are integrally formed with a thermoplastic resin 467 such as PPE (polyphenylene ether).

  The sleeve bearing 466 integrally formed with the thermoplastic resin 467 together with the resin magnet 468 has an end surface provided with an opening 466a for inserting the shaft 470 and an outer peripheral portion of the other end surface of the sleeve bearing 466 at the time of injection molding of the thermoplastic resin 467. It is possible to improve the quality of the pump 410 by clamping the sleeve bearing 466 in the axial direction by holding the plurality of places with a holding part provided in the molding die of the rotor part 460a. As shown in FIG. 17, in the rotor portion 460a, the pressing portion of the molding die remains as the hole 460a-3 on the other end surface side of the sleeve bearing 466.

  Further, a substantially conical protrusion 460a-1 is formed at a substantially central portion of the impeller installation surface 460a-4 of the rotor portion 460a. The substantially conical protrusion 460a-1 smoothly bends the flow of the fluid suction portion (near the protrusion 460a-1) of the impeller 460b (FIGS. 18 to 20) in the radial direction of the impeller 460b ( FIG. 15 arrow (fluid flow)). Thereby, fluid loss due to collision or separation of the flow in the fluid suction portion (near the protrusion 460a-1) of the impeller 460b is reduced, and the efficiency of the pump 410 can be increased.

  Further, the rotor portion 460a is formed with a balancing hole 460a-2 inside the resin magnet 468 and outside the sleeve bearing 466. As shown in FIG. 18, two balance holes 460a-2 are formed at intervals of approximately 180 ° in the circumferential direction.

  As shown in FIG. 17, the balance hole 460a-2 has one end portion that opens and communicates with the vicinity of the protrusion 460a-1 (the fluid suction portion of the impeller 460b), and the other end portion that is the rotor portion 460a. Is opened and communicated with the inside (the opening 466a side of the sleeve bearing 466).

  The role of the balance hole 460a-2 will be described. In the pump 410, when the rotor 460 rotates, fluid (for example, water) flows from the suction port 442 into the fluid suction portion of the impeller 460b (near the protrusion 460a-1 of the rotor portion 460a). Then, the fluid is swirled by the rotation of the impeller 460b, and the fluid is sucked by the force and discharged from the discharge port 443.

  In the centrifugal impeller, since the suction portion into which the fluid flows is open, in the pump 410, a fluid higher in pressure than the suction portion side discharged from the impeller 460b exists on the back side of the rotor portion 460a. Therefore, the rotor 460 is pressed against the suction part side by a differential pressure from the suction part side with a low pressure. Specifically, since the sliding portion 460c (see FIG. 18 and the like) of the impeller 460b is pressed against the thrust bearing 471 by the force due to the differential pressure, the sliding portion 460c of the impeller 460b or the thrust bearing 471 is easily worn. .

  By providing the counter hole 460a-2 in the rotor portion 460a, the high pressure side of the rotor portion 460a communicates with the suction portion side having a low pressure, so that the pressure on the high pressure side of the rotor portion 460a is almost the same as that of the suction portion. can do. Accordingly, the thrust force that presses the sliding portion 460c of the impeller 460b against the thrust bearing 471 is reduced, and wear of the sliding portion 460c of the impeller 460b or the thrust bearing 471 is suppressed.

  The rotor 460 is supported by an annular groove 448 of the casing 441 while a sleeve bearing 466 is slidably supported by a shaft 470 described later, and a sliding portion 460 c is in contact with the thrust bearing 471.

  As shown in FIGS. 18 and 19, the impeller 460b includes an impeller portion 460d and a sliding portion 460c. The impeller portion 460d and the sliding portion 460c are manufactured by resin molding such as PPE (polyphenylene ether). The impeller portion 460d and the sliding portion 460c are joined by ultrasonic welding or the like.

  The substantially donut-shaped sliding portion 460c (see FIGS. 21 and 22) assembled to the sliding surface of the impeller 460b with the thrust bearing 471 is obtained by adding carbon fiber or the like to a thermoplastic resin such as PPS (polyphenylene sulfide). It is manufactured by injection molding a thermoplastic resin having excellent wear resistance and slidability.

  As shown in FIG. 21, one end surface of the sliding portion 460c is a sliding surface 460c-2 that contacts the thrust bearing 471.

  As shown in FIG. 22, the joint surface with the impeller portion 460d on the other end surface is provided with a plurality of substantially square-shaped protrusions 460c-1 that are used as the swivel of the sliding portion 460c (six in FIG. 22). . Ultrasonic welding ribs (portions that melt during ultrasonic welding) are provided on the surface of at least one of the substantially rectangular protrusion 460c-1 and the bonding surface.

  The protrusions 460c-1 of the sliding portion 460c are fitted into the notches 460d-1 (see FIG. 23) that are radially provided in the sliding portion assembly portion of the impeller 460b, and the sliding portion 460c is ultrasonically welded. Etc. to join the impeller part 460d (see FIGS. 25 and 26).

  By joining the sliding portion 460c and the impeller portion 460d, and the impeller 460b and the rotor portion 460a by ultrasonic welding or the like, the perpendicularity between the sleeve bearing 466 and the sliding surface 460c-2 is ensured. The quality of the pump 410 can be improved.

  As shown in FIG. 23, the impeller portion 460d includes a ring-shaped sliding portion assembly portion at a substantially central portion of the surface on the opposite side of the rotor portion 460a. A plurality of notches 460d-1 are formed at substantially equal intervals in the circumferential direction in the ring-shaped sliding portion assembly portion.

  As shown in FIG. 24, the impeller portion 460d has a plurality of (six in FIG. 24) arcuate blades 460d-2 formed on the surface on the rotor portion 460a side at substantially equal intervals in the circumferential direction. .

  Next, the impeller 560b of the modification 1 is demonstrated with reference to FIGS. The impeller 560b of Modification 1 is manufactured by inserting a substantially donut-shaped sliding portion 560c (see FIGS. 29 and 30) into a molding die of the impeller 560b and integrally molding with a thermoplastic resin such as PPS. Is done.

  The sliding portion 560c is a thermoplastic having improved wear resistance and friction resistance by adding carbon fiber to a thermoplastic resin such as PPS (polyphenylene sulfide) on the sliding surface 560c-2 with the thrust bearing 471. Manufactured using resin or ceramic such as alumina.

  In this case, the substantially donut-shaped sliding portion 560c to be insert-molded includes a flange portion 560c-3 (see FIGS. 29 and 30) at a predetermined position in the axial direction, and forms an impeller portion 560d at the time of integral molding. The thermoplastic resin grips the flange portion 560c-3 and prevents the sliding portion 560c from coming off, so that the quality of the pump 410 can be improved.

  The impeller 660b according to the second modification will be described with reference to FIGS. 31 to 34. The impeller 660b of the second modification includes a plurality (six in FIG. 33) of substantially rectangular notches 660d-1 on the inner diameter side that is the fluid suction port of the impeller portion 660d.

  Sliding part 660c with thrust bearing 471 is added to impeller part 660d, carbon fiber is added to PPS (polyphenylene sulfide), etc., and is integrally molded using a thermoplastic resin that has improved wear resistance and friction resistance. To do.

  At this time, since a plurality of substantially rectangular notches 660d-1 are provided on the inner diameter side which is the fluid suction port of the impeller portion 660d, the quality of the pump 410 can be prevented by preventing the sliding portion 660c from rotating and preventing it from coming off. It is possible to improve.

  The shaft 470 will be described with reference to FIGS. As shown in FIGS. 14 and 15, the shaft 470 includes two cylindrical portions having different diameters. The cylindrical portion having a small diameter is fixed to the shaft support portion 494 of the bowl-shaped partition wall component 490 by, for example, press-fitting.

  The thick cylindrical portion of the shaft 470 is free and cantilevered. The rotor 460 is slidably inserted from the opening 466a (see FIG. 17) of the sleeve bearing 466 into the thick cylindrical portion of the shaft 470.

  The rotor 460 rotates around a shaft 470 fixed to the shaft support portion 494 of the bowl-shaped partition wall component 490. As described above, the rotor 460 is supported by the annular groove 448 of the casing 441 while the sleeve bearing 466 is slidably supported by the shaft 470 and the sliding portion 460 c is in contact with the thrust bearing 471. .

  A shaft 570 of a modified example will be described with reference to FIG. The shaft 570 of the modified example is integrated with a thermoplastic resin when the bowl-shaped partition wall part 490 is molded. The shaft 570 includes a flange portion 570a that is gripped with a thermoplastic resin when the flange-shaped partition wall component 490 is molded.

  The O-ring 480 is the same as the O-ring 80 of the first embodiment. The O-ring 480 is installed in an annular O-ring housing groove 490c provided in a bowl-shaped partition wall component 490 described later. The casing 441 is assembled to the bowl-shaped partition wall part 490, and the O-ring 480 is crushed by a predetermined distance to seal the bowl-shaped partition wall part 490 and the casing 441.

  With reference to FIGS. 14 and 15, the bowl-shaped partition wall component 490 will be described. The bowl-shaped partition wall component 490 is the same as the bowl-shaped partition wall component 90 of the first embodiment.

  The saddle-shaped partition wall part 490 is molded using a thermoplastic resin such as PPE (polyphenylene ether). The saddle-shaped partition wall part 490 includes a flange-shaped partition wall portion 490a that is a fitting portion with the mold stator 450, and a flange portion 490b.

  The bowl-shaped partition wall portion 490a includes a circular bottom and a cylindrical partition wall. A shaft support portion 494 into which one end of the shaft is inserted is erected at a substantially central portion of the inner surface of the circular bottom portion.

  A rib 491 extending in the axial direction is formed on the outer peripheral surface of the bowl-shaped partition wall portion 490a. The rib 491 is formed to have a predetermined length in the axial direction from the base of the flange-shaped partition wall portion 490a (connecting portion with the flange portion 490b). And the dimension of the radial direction of the rib 491 is a taper shape in which the base side of the bowl-shaped partition part 490a is large, and becomes small as it goes ahead.

  In the flange portion 490b, six reinforcing ribs (not shown) that reinforce the flange portion 490b are formed radially in the radial direction. The rib 491 of the bowl-shaped partition wall portion 490a is connected to any one of the reinforcing ribs. Thereby, manufacture of the shaping die of the bowl-shaped partition part 490 becomes easy.

  The flange portion 490b includes an annular rib (not shown) that fits in an annular third groove (not shown) formed on the flange portion installation surface of the flange-shaped partition wall component of the mold stator 450.

  In addition, holes 490d (screw holes) through which the tapping screw 560 passes are formed in the flange portion 490b at four locations.

  Furthermore, an annular O-ring storage groove 490c for storing the O-ring 480 is formed on the surface of the flange portion 490b on the casing 441 side.

  The pump 410 first inserts the rotor 460 into the shaft 470 fixed or integrally formed with the bowl-shaped partition wall part 490. An O-ring 480 is installed in the O-ring storage groove 490 c of the flange 490 b of the flange-shaped partition wall component 490. And the casing 441 is assembled | attached to the bowl-shaped partition part 90, and the pump part 440 is assembled. Further, the pump 410 is assembled by assembling the pump portion 440 and the mold stator 450 with the tapping screw 560 through the screw holes 445a and the holes 490d provided in the pump portion 440.

  A rotor 460 that rotates about a shaft 470 that is fixed to or integrally molded with the bowl-shaped partition wall component 490 includes an annular groove 448 provided on the inner side of the casing 441 by a sliding portion 460c that is assembled to the rotor portion 460a, or a PPS. And the like, and is in sliding contact with a thrust bearing 471 made of a thermoplastic resin obtained by adding carbon fiber or the like or alumina ceramic.

  With such a configuration, while ensuring a stable rotational operation of the rotor 460, the return path (see FIG. 12) in the gap between the impeller 460b and the casing 441 is shut off, and the circulation loss inside the pump chamber is reduced. In addition, the efficiency of the pump 410 can be increased.

  Further, the flow in the vicinity of the impeller suction portion (substantially conical protrusion 460a-1) is caused by the substantially conical protrusion 460a-1 formed at the substantially central portion of the impeller installation surface 460a-4 of the rotor part 460a. Is smoothly bent in the radial direction of the impeller 460b (see FIG. 15), so that fluid loss due to flow collision and separation near the suction portion of the impeller 460b is reduced, and the efficiency of the pump 410 is improved. It becomes possible.

  As in the first embodiment, when the mold stator 450 and the pump portion 440 are assembled, the first groove 451 formed in the axial direction on the inner peripheral portion of the mold stator 450 and the bowl-shaped partition wall component The rib 491 extending in the axial direction is fitted to the outer peripheral surface of the 490-shaped partition wall portion 490a, thereby positioning in the rotational direction (circumferential direction) (see FIG. 15).

  The gap between the inner periphery of the mold stator 450 and the outer periphery of the bowl-shaped partition wall portion 490a of the bowl-shaped partition wall component 490 is made as small as possible (for example, about 0.02 to 0.06 mm), and the mold stator 450 and the rotor The first groove 451 serving as an air escape path formed in the axial direction is provided in the inner peripheral portion of the mold stator 450 while ensuring the same axis as the 460, and the flange to the inner periphery of the mold stator 450 is provided. The partition member 490 can be easily inserted.

  Further, a rib 491 having a predetermined length is formed in the hook-shaped partition wall portion 490a in the axial direction from the root of the hook-shaped partition wall portion 490a (the connecting portion with the flange portion 490b). The radial dimension of the rib 491 is tapered so that the base side of the bowl-shaped partition wall portion 490a is large and decreases toward the front, and the rib 491 has a predetermined radial gap (in the first groove 451 of the mold stator 450). It is made to fit in the state which can be performed about 1 mm. Accordingly, the mold stator 450 and the bowl-shaped partition wall part 490 can be positioned, and the mold stator 450 and the bowl-shaped partition wall part 490 can be easily assembled.

  The manufacturing process of the pump 410 will be described with reference to FIG.

(1) Step 1: A stator 447 (not shown, the same as the stator 47) is manufactured. First, an electromagnetic steel sheet having a thickness of about 0.1 to 0.7 mm is punched into a band shape, and is laminated by caulking, welding, bonding, etc., and a band-shaped stator core 454 (not shown) The same as the stator core 54). The teeth are provided with an insulating part 456 (not shown, the same as the insulating part 56) using a thermoplastic resin such as PBT (polybutylene terephthalate). Concentrated winding coil 457 (not shown, the same as coil 57) is wound around the teeth provided with insulating portion 456. For example, six concentrated winding coils 457 are connected to form a three-phase single Y-connection winding. Since it is a three-phase single Y connection, a terminal 459 (not shown, the same as the terminal 59) to which a coil 457 of each phase (U phase, V phase, W phase) is connected on the connection side of the insulating portion 456, A power supply terminal to which power is supplied and a neutral point terminal) are assembled. In addition, a substrate 458 (not shown, the same as the substrate 58) is manufactured. The substrate 458 is sandwiched between the insulating portion 456 by a substrate pressing component. On the substrate 458, an IC 458a (not shown, the same as the IC 58a) for driving an electric motor (brushless DC motor), a Hall element 458b (not shown, the same as the Hall element 58b) for detecting the position of the rotor 460, and the like are mounted. Has been. Also, the substrate 458 has a lead wire lead-out component 461 (not shown, lead wire lead-out component 61) that feeds a lead wire 452 (not shown, the same as the lead wire 52) into a notch near the outer peripheral edge thereof. The same) is attached. In addition, the rotor portion 460a is manufactured. The rotor portion 460a includes a ring-shaped (cylindrical) resin magnet 468 formed by pelletizing a magnetic powder such as ferrite and a resin, and a cylindrical sleeve bearing 466 (for example, carbon) provided inside the resin magnet 468. Made of a thermoplastic resin 467 such as PPE (polyphenylene ether). At the same time, the impeller 460b is formed. The impeller 460b is molded using a thermoplastic resin such as PPE (polyphenylene ether).
(2) Step 2: Assemble the substrate 458 to the stator 447. The substrate 458 to which the lead wire lead-out component 461 is attached is fixed to the insulating portion 456 by the substrate holding component. In addition, the impeller 460b is assembled to the rotor portion 460a by ultrasonic welding or the like. The shaft 470 is press-fitted into the shaft support portion 494 of the bowl-shaped partition wall component 490. In addition, the bowl-shaped partition wall component 90 is formed. In addition, the thrust bearing 471 is manufactured. The shaft 470 is manufactured from SUS. The thrust bearing 471 is made of ceramic.
(3) Step 3: Solder the terminal 459 of the stator 447 (the power supply terminal to which power is supplied and the neutral point terminal) and the substrate 458. By attaching a pilot hole part 481 (not shown, the same as the pilot hole part 81) to the stator 447, a stator assembly 449 (not shown, the same as the stator assembly 49) is completed. The shaft 470 is press-fitted into the shaft support portion 494 of the bowl-shaped partition wall component 490, and the rotor 460 and the like are assembled. In addition, the casing 441 is molded together. The casing 441 is molded using a thermoplastic resin such as PPS (polyphenylene sulfide).
(4) Step 4: The stator assembly 449 is molded to manufacture the mold stator 450. In addition, the pump 440 is assembled by fixing the casing 441 to the bowl-shaped partition wall part 490. In addition, a tapping screw 560 is also manufactured.
(5) Step 5: Assemble the pump 410. The pump unit 440 is assembled to the mold stator 450 and fixed with a tapping screw 560. When assembling the mold stator 450 and the pump unit 440, the first groove 451 provided in the inner diameter of the mold stator 450 and the bowl-shaped partition wall portion 490a having the inner diameter of the mold stator 450 of the bowl-shaped partition wall component 490 are provided. When the rib 491 is fitted, positioning with respect to the rotation direction is performed.

  1 compressor, 2 refrigerant-water heat exchanger, 3 decompression device, 4 evaporator, 5 pressure detection device, 6 fan motor, 7 fan, 8 boiling temperature detection means, 9 feed water temperature detection means, 10 pump, 11 operation Part, 12 tank unit control part, 13 heat pump unit control part, 14 hot water tank, 15 refrigerant pipe, 16 hot water circulation pipe, 17 outside air temperature detection means, 31 bath water reheating heat exchanger, 32 bath water circulation apparatus, 33 mixing valve , 34 Water temperature detecting device in tank, 35 Water temperature detecting device after reheating, 36 Water temperature detecting device after mixing, 37 Bath water reheating piping, 40 Pump part, 41 Casing, 42 Suction port, 43 Discharge port, 44 Boss part, 44a Screw hole, 45 Mounting leg, 45a hole, 46 Shaft support, 47 Stator, 48 Rib, 49 Stator assembly, 50 Mold Stator, 51 First groove, 52 Lead wire, 53 Mold resin, 54 Stator core, 56 Insulating part, 57 Coil, 58 Substrate, 58a IC, 59 terminal, 60 rotor, 60a rotor part, 60b Impeller, 61 Lead wire lead part, 63 Pump portion installation surface, 64 Second groove, 65 Third groove, 66 Sleeve bearing, 67 Resin, 68 Resin magnet, 70 shaft, 71a First thrust bearing, 71b Second thrust Bearing, 80 O-ring, 81 Pilot hole part, 82 Mold holding part, 83 Protrusion, 84 Pilot hole, 85 Foot part, 85a Protrusion, 86 Claw, 87 Connecting part, 90 Hook-shaped partition part, 90a Hook-shaped partition wall part, 90b collar part, 90c O-ring storage groove, 90d hole, 91 rib, 93 annular rib, 94 shaft support part, 95 substrate holding part, 100 heat pump unit , 160 tapping screw, 200 tank unit, 300 heat pump type hot water supply device, 410 pump, 440 pump part, 441 casing, 442 suction port, 443 discharge port, 444 boss part, 444a screw hole, 445 mounting leg, 445a screw hole, 447 Stator, 448 Groove, 449 Stator Assembly, 450 Mold Stator, 451 First Groove, 454 Stator Core, 456 Insulator, 457 Coil, 458 Substrate, 458a IC, 458b Hall Element, 459 Terminal, 460 Rotation 460a rotor part, 460a-1 protrusion, 460a-2 balancing hole, 460a-3 hole, 460a-4 impeller installation surface, 460b impeller, 460c sliding part, 460d-1 notch, 460c-2 sliding Moving surface, 460d Impeller part, 460d-1 Notch, 460d-2 blade, 466 sleeve bearing, 466a opening, 467 thermoplastic resin, 468 resin magnet, 470 shaft, 471 thrust bearing, 480 O-ring, 481 pilot hole part, 490 bowl shaped partition part, 490a bowl shape Bulkhead part, 490b collar part, 490c O-ring storage groove, 490d hole, 494 shaft support part, 491 rib, 560 tapping screw, 560b impeller, 560c sliding part, 560c-2 sliding surface, 560c-3 flange part, 560d impeller part, 570 shaft, 570a collar part, 660b impeller, 660c sliding part, 660d impeller part, 660d-1 Notch.

Claims (8)

A stator assembled with a board on which a coil is formed by winding around a plurality of teeth provided with an insulating portion of a stator core, an electronic component is mounted, and a lead wire lead-out component that leads a lead wire is attached A mold stator formed by molding a mold resin;
A rotor having a casing having a fluid inlet and outlet, an annular groove formed around the inside of the inlet, and a rotor and an impeller is housed inside, and the rotor slides. A pump unit formed by assembling a bowl-shaped partition wall part having a bowl-shaped partition wall part that fits freely and a collar part;
A shaft on which one end is fixed to the shaft support portion of the bowl-shaped partition wall portion,
The rotor part is
A sleeve bearing provided at the center of the rotor and slidably fitted to the other end of the shaft;
A substantially conical protrusion that is provided at a central portion of an impeller installation surface formed at an axial end of the rotor portion on the impeller side and guides the fluid flowing from the suction port to the impeller; Have
The impeller includes a substantially donut-shaped sliding portion that is housed in the annular groove of the casing .
The annular groove portion of the casing is provided with a substantially donut-shaped thrust bearing,
The impeller includes an impeller part and a sliding part,
The impeller portion is manufactured by injection molding a thermoplastic resin, and has a plurality of square notches at an end portion on the side in sliding contact with the thrust bearing,
The sliding portion is manufactured by injection molding a thermoplastic resin in which carbon fiber or the like is added to PPS or the like, a sliding surface in sliding contact with the annular groove portion or the thrust bearing of the casing, and the impeller portion side A plurality of protrusions that serve as a detent for the sliding part at the time of joining to the impeller part on the end surface of the
Pump the sliding portion and the projection is fitted into the sliding portion in the notch of the impeller portion is characterized Rukoto bonded to the impeller portion. The thrust bearing is a thermoplastic resin was added and carbon fibers such as PPS or pump according to claim 1, characterized in that it is manufactured of alumina ceramic. At least one hand of the projection or joint surface of the sliding portion, pump according to claim 1 or claim 2, characterized in that it comprises an ultrasonic welding ribs. Any of claims 1 to 3, characterized in that the projection is the sliding portion write or which are fitted in the sliding portion to the notch of the impeller portion is joined to the impeller portion by ultrasonic welding pump according to any. A stator assembled with a board on which a coil is formed by winding around a plurality of teeth provided with an insulating portion of a stator core, an electronic component is mounted, and a lead wire lead-out component that leads a lead wire is attached A mold stator formed by molding a mold resin;
A rotor having a casing having a fluid inlet and outlet, an annular groove formed around the inside of the inlet, and a rotor and an impeller is housed inside, and the rotor slides. A pump unit formed by assembling a bowl-shaped partition wall part having a bowl-shaped partition wall part that fits freely and a collar part;
A shaft on which one end is fixed to the shaft support portion of the bowl-shaped partition wall portion,
The rotor part is
A sleeve bearing provided at the center of the rotor and slidably fitted to the other end of the shaft;
A substantially conical protrusion that is provided at a central portion of an impeller installation surface formed at an axial end of the rotor portion on the impeller side and guides the fluid flowing from the suction port to the impeller; Have
The impeller includes a substantially donut-shaped sliding portion that is housed in the annular groove of the casing .
The impeller includes an impeller part and a sliding part,
The impeller is a substantially donut-shaped sliding portion manufactured by injection molding a thermoplastic resin in which carbon fiber or the like is added to PPS or the like, or a substantially donut-shaped sliding portion manufactured by alumina ceramic. Is inserted into a molding die and integrally molded with a thermoplastic resin.
The sliding portion has a flange portion at a predetermined position in the axial direction, and the thermoplastic resin forming the impeller portion at the time of integral molding holds the flange portion to prevent the sliding portion from coming off. A pump characterized by that. A stator assembled with a board on which a coil is formed by winding around a plurality of teeth provided with an insulating portion of a stator core, an electronic component is mounted, and a lead wire lead-out component that leads a lead wire is attached A mold stator formed by molding a mold resin;
A rotor having a casing having a fluid inlet and outlet, an annular groove formed around the inside of the inlet, and a rotor and an impeller is housed inside, and the rotor slides. A pump unit formed by assembling a bowl-shaped partition wall part having a bowl-shaped partition wall part that fits freely and a collar part;
A shaft on which one end is fixed to the shaft support portion of the bowl-shaped partition wall portion,
The rotor part is
A sleeve bearing provided at the center of the rotor and slidably fitted to the other end of the shaft;
A substantially conical protrusion that is provided at a central portion of an impeller installation surface formed at an axial end of the rotor portion on the impeller side and guides the fluid flowing from the suction port to the impeller; Have
The impeller includes a substantially donut-shaped sliding portion that is housed in the annular groove of the casing .
The impeller includes an impeller part and a sliding part,
The impeller is formed by inserting the impeller portion manufactured by injection molding of a thermoplastic resin into a molding die and integrally molding a thermoplastic resin in which carbon fiber or the like is added to PPS or the like. Formed,
A plurality of angular notches are radially provided on the inner diameter side of the fluid suction port of the impeller portion, and the thermoplastic resin forming the sliding portion flows into the notches when the sliding portion is integrally formed. By doing so, the periphery of the sliding part is prevented and the pump is prevented from coming off . In the rotor portion, a ring-shaped resin magnet formed by pelletizing a magnetic powder such as ferrite and a resin and a cylindrical sleeve bearing provided inside the resin magnet are integrated with a thermoplastic resin. Become
The sleeve bearing sandwiches one end surface of the sleeve bearing and the other end surface of the sleeve bearing with a molding die of the rotor portion during injection molding of the thermoplastic resin, and the shaft of the sleeve bearing The pump according to any one of claims 1 to 6 , wherein positioning in a direction is performed. A heat pump type hot water supply apparatus, wherein the pump according to any one of claims 1 to 7 is mounted.

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