JP2006250066A - Pump and liquid supply device equipped with it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a convenient and inexpensive pump easily assembled, maintained and inspected, and a liquid supply device equipped with the pump. <P>SOLUTION: This pump has a pump part 13 housing two impellers 24, 25 for sucking/discharging liquid in series, a pump case 14 in which the pump part 13 is stored and a suction port 11 and discharge port 12 of the liquid are arranged, and a motor part 10 for driving the pump part 13. Projecting projections 32 of hollow projecting parts having predetermined inner diameter and length are provided in a central part in the side in which the impellers 24, 25 oppose to each other, and a shaft 30 penetrating through the projecting projections 32 of the projecting parts and the impellers 24, 25 and rotatably supporting the impellers 24, 25 is provided. Projecting fitting parts having predetermined width and length are provided on the surfaces of the projecting projections 32 of the projecting parts. A connection pipe 28 in which recessed fitting parts fitted into the projecting fitting parts are formed at the both end parts and which integrally rotates the impellers 24, 25 by connecting the opposing projections is arranged. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

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

  In pumps that are often circulated while maintaining a full water condition, liquid leakage may occur from the shaft seal part. For this reason, the water passage part where the impeller exists and the drive mechanism part where the motor exists For example, a canned motor pump without a shaft seal structure is used.

  In a canned motor pump, a rotor integrated with an impeller is housed in a partition, which is sealed with a partition without sealing the shaft, and rotational magnetic force generated by a stator provided outside is transmitted to the rotor via the partition. It is structured to be driven by acting on a magnet.

  In addition to this, a magnet coupling type electromagnetically driven pump is used in which a disk-shaped or cylindrical magnet is rotated by a motor and is rotationally driven by being magnetically coupled to a magnet of an internal rotor via a partition wall.

  These canned motor pumps and magnet coupling type electromagnetic drive pumps are called sealless pumps because they do not have a shaft seal structure by transmitting power to the impeller in the pump case by electromagnetic force.

  Among such sealless pumps, in recent years, the market demands a small pump with a high head and high reliability.

  As a pump for realizing this, there is a multi-stage sealless pump in which a shaft is fixed to a partition wall, and an impeller integrally formed with a rotor around which a permanent magnet is arranged rotates so that the shaft does not rotate. Although it is conceivable, since the shaft does not rotate, it is necessary to transmit the power of the impeller on the discharge port side to the impeller on the suction port side so that the shaft rotates integrally.

  However, in the case of a shaft rotation type magnet driven pump in which the transmission of the impeller is performed by the shaft, various structures that take into consideration the assemblability, workability, etc. are adopted depending on the structure of the shaft. A flat portion is formed in the hole, and a chamfered portion along the flat portion is provided on the outer peripheral surface of the shaft, and the shaft divided into three is inserted into the central hole of the impeller so as to rotate integrally. (For example, refer to Patent Document 1).

  Thereby, a long shaft can be formed by connecting relatively short shafts in series, and as a result, the cost of the pump itself can be reduced.

  On the other hand, in the case of a pump whose shaft does not rotate, two impellers are detachably coupled at an intermediate portion with a screw cap (see, for example, Patent Document 2).

As a result, disassembly can be facilitated, and convenience during maintenance and inspection can be improved.
Japanese Patent Laid-Open No. 10-231793 JP 52-149602 A

  However, in the case described in the prior art (Patent Document 1), a load is directly applied to the shaft and a rotational torque is required, so that vibration and noise may increase.

  Further, in the case described in (Patent Document 2) of the prior art, it is often applied only to a relatively large pump, and the structure becomes complicated to be adopted for a small pump, resulting in an increase in cost. It was.

  The present invention solves such a conventional problem, and an object of the present invention is to provide a low-cost pump that is easy to assemble and maintain and is highly convenient.

  In order to achieve the above-mentioned object, the present invention provides a pump part in which at least two impellers for sucking and discharging liquid are incorporated in series, a pump case in which the pump part is housed and a liquid inlet and outlet are arranged. A motor unit for driving the pump unit, and a hollow projection having a predetermined inner diameter and length at a center portion of the impeller facing each other, a projection and the impeller penetrating the impeller A concave fitting portion having a convex support portion having a predetermined width and length on the surface of the projection, and fitted with a convex fitting portion at both ends. The connection pipe which connects the protrusion which opposes and rotates an impeller integrally is arrange | positioned, It is characterized by the above-mentioned.

  With this configuration, since the impeller built in the pump unit rotates integrally, the power of the impeller on the discharge port side can be reliably transmitted to the impeller on the suction port side, and the same blade can be used. The effect | action that the space | interval of an impeller can be freely adjusted by changing the length of a connecting pipe can be achieved.

  The present invention is advantageous in that it is easy to assemble and maintain, and can provide a highly convenient and low-cost pump and a liquid supply apparatus including the pump.

  An embodiment of the present invention includes a pump unit in which at least two impellers for sucking and discharging liquid are built in series, a pump case in which the pump unit is housed and a liquid suction port and a discharge port are arranged, and a pump unit. A motor unit for driving, and a hollow projection having a predetermined inner diameter and length at the center of the impeller facing each other, and the impeller through the projection and the impeller to rotatably support the impeller Protrusions having a shaft, provided with a convex fitting portion having a predetermined width and length on the surface of the protrusion, and formed with a concave fitting portion that engages with the convex fitting portion at both ends. And connecting pipes for rotating the impeller integrally.

  As a result, since the impeller built in the pump unit rotates integrally, the power of the impeller on the discharge port side can be reliably transmitted to the impeller on the suction port side, and it can be connected even if the same blade is used. Since the interval between the impellers can be freely adjusted by changing the length of the tube, it is possible to provide a convenient and low-cost pump that is easy to assemble and maintain.

  In addition, between the impellers, the guide vanes for introducing the liquid discharged from the impeller on the suction port side into the adjacent impellers on the discharge port side, and the liquid discharged by the impeller on the discharge port side are on the suction port side. A partition plate that prevents backflow to the impeller may be provided, and an annular protrusion having a predetermined height for fixing the guide blade and the partition plate to the pump case may be disposed at a predetermined location inside the pump case. .

  Thereby, a screw etc. are not used for the connection of an impeller, but an assembly of a pump can be made easy.

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

  Embodiments of the present invention will be described below with reference to the drawings.

Example 1
As shown in the overall schematic diagram of the bathtub water circulation device shown in Embodiments 1 and 2 of FIG. 1, there is a bathtub 1 made of artificial marble, stainless steel, FRP (fiber reinforced plastic) or the like, and outside the bathtub 1. A pump 3 for sucking and discharging the bathtub water 2 in the bathtub 1 and a heating unit 4 using gas, electricity, kerosene or the like for heating the bathtub water 2 are installed.

  An outlet 5 for bath water 2 is attached to the lower side surface of the bathtub 1, and a circulation path 6 made of heat-resistant PVC (vinyl chloride), stainless steel or the like is connected to the outlet 5.

  A pump 3 is attached in the middle of the circulation path 6, and the circulation path 6 is further connected to the heating unit 4.

  A circulation return path 7 made of heat-resistant polyvinyl chloride (vinyl chloride), stainless steel or the like is connected to the heating unit 4, and the circulation return path 7 is an inflow port attached to the side of the bathtub 1 and above the outflow port 5. 8 is connected.

  As shown in the sectional view of the pump shown in Embodiments 1 and 2 in FIG. 2 and the simplified exploded perspective view of the pump shown in Embodiments 1 and 2 in FIG. A pump case 14 made of a plastic such as polyphenylene sulfide (PPS) or a metal such as stainless steel and having a pump portion 13 provided with a mouth 11 and a discharge port 12 for sucking and discharging the bathtub water 2 is disposed.

  On the lower side, a motor unit 10 serving as a driving source for the pump 3 is housed, and the motor unit 10 and the pump unit 13 are separated from each other to prevent the bath water 2 from entering the motor unit 10 from the pump unit 13. A waterproof partition 15 made of a metal, heat resistant plastic or the like is provided.

  The motor unit 10 includes a cylindrical stator 16 that generates a magnetic field, a control unit 17 that controls the stator 16, a resin 18 that is injected and cured to protect the stator 16 and the control unit 17, and the exposure of the resin 18. The stator 16 is attached to the inside of the waterproof partition 15 in a concave shape.

  A control unit 17 including electronic components 20 and 21 such as a transformer and a transistor is attached to the lower side of the stator 16.

  On the other hand, the pump unit 13 includes a cylindrical rotor 22 made of a permanent magnet and driven by a magnetic field generated by the stator 16, and a plurality of blades 23 attached to the surface integrally with the rotor 22 are formed. .

  The cylindrical discharge port side impeller 24 made of plastic such as PPS that sucks and discharges the bathtub water 2 by the plurality of blades 23 and the cylindrical intake port side impeller 25 also made of plastic such as PPS. Is attached.

  There is a disc-shaped partition plate 26 made of a metal such as stainless steel that partitions the impeller 24 on the discharge port side and the impeller 25 on the suction port side, and discharges water discharged from the impeller 25 on the suction port side in the peripheral direction. A guide vane 27 made of plastic such as PPS for guiding water to the central suction port of the side impeller 24 is disposed.

  Between the discharge-side impeller 24 and the suction-side impeller 25, a cylindrical connection made of plastic such as PPS that connects the discharge-side impeller 24 and the suction-side impeller 25. A tube 28 is arranged.

  A bearing 29 made of baked carbon or molded carbon is attached to the center of rotation of the impeller 24 on the discharge port side and the impeller 25 on the suction port side, and the rotor 22, the impeller 24 on the discharge port side, and the suction port. A cylindrical shaft 30 made of a metal such as stainless steel that rotatably supports the mouth-side impeller 25 is disposed.

  Further, on both sides of the shaft 30, a hollow disk-shaped bearing plate 31 made of ceramic or the like that is in sliding contact with the bearing 29 is attached.

  Further, the rotor 22 is installed so as to face the stator 16 through the waterproof partition 15.

  Here, as shown in the simplified exploded perspective view of the impeller and the connecting pipe shown in Embodiments 1 and 2 of FIG. 4, the connection of the impeller 24 on the discharge port side and the impeller 25 on the suction port side is performed on the discharge port side. A cross-shaped convex fitting portion is provided on the suction port side projection of the impeller 24 and the discharge port side projection of the suction port side impeller 25, and the connecting pipe 28 is matched to the shape of the convex fitting portion. The concave fitting part 33 of the connection pipe 28 is inserted into the convex fitting part 32 of the suction port side protrusion of the impeller 24 on the discharge port side, and the suction of the connection pipe 28 is taken. The convex fitting portion 32 of the discharge port side protrusion of the inlet side impeller 25 is inserted into the mouth side concave fitting portion 33.

  Therefore, the connecting pipe 28 is inserted between the impeller 24 on the discharge port side and the impeller 25 on the suction port side, and is connected, whereby the power of the impeller 24 on the discharge port side is transferred to the impeller 25 on the suction port side. The distance between the impellers can be freely adjusted by changing the length of the connecting pipe even if the same blade is used.

  In the above configuration, the operation of the pump in the first embodiment and the bathtub water circulation device including the pump will be described with reference to FIGS. 1 to 3.

  When the stator 16 controlled by the control unit 17 in the pump 3 generates a magnetic field, the rotor 22 is rotationally driven by the magnetic field.

  When the rotor 22 is rotationally driven, the discharge port side impeller 24 integrally formed with the rotor 22 is also rotationally driven, and the inlet tube side impeller 25 is rotationally driven by the connecting pipe 28 to thereby pump the pump. 3 is driven.

  When the pump 3 is driven, the bathtub water 2 flows into the circulation forward path 6 from the outlet 5 attached to the lower side surface of the bathtub 1, flows through the circulation forward path 6, and is an inlet 11 installed on the upper side surface of the pump 3. Then, the air is sucked into the impeller 25 on the suction port side in the pump 3.

  The sucked bathtub water 2 is pumped in the circumferential direction by a plurality of blades 23 formed on the surface of the rotating inlet side impeller 25 and is provided to the peripheral notch by the blades provided around the guide blades 27. Water is introduced, water is led from this notch to the suction chamber of the impeller 24 on the discharge port side separated by the guide vane 27 and the partition plate 26, and the discharge port pump is provided by the return vane provided on the discharge port side of the guide vane 27. The water is introduced into the central suction port and sucked into the impeller 24 on the discharge port side.

  The sucked bathtub water 2 is pumped in the circumferential direction by a plurality of blades 23 formed on the surface of the rotating discharge port side impeller 24 and discharged outside the pump 3 from the discharge port 12 arranged on the side surface. .

  The discharged bath water 2 is introduced into a heating unit 4 using gas, electricity, kerosene or the like through a circulation path 6 connected to a discharge port 12 and heated to a predetermined temperature, and then the heating unit 4 And flows into the bathtub 1 from the inlet 8 attached to the upper side of the outlet 5 on the side surface of the bathtub 1.

  In this way, the bathtub water 2 is circulated by using the pump 3 and heated to a predetermined temperature in the heating unit 4, thereby heating the bathtub water 2 in the bathtub 1 to a predetermined temperature, and the bathtub water after the heating. By continuing the circulation of 2, it becomes possible to always maintain the temperature of the bath water 2 at a predetermined temperature.

  As described above, according to the first embodiment, a cross-shaped convex fitting portion is provided on the suction port side projection of the discharge port side impeller 24 and the discharge port side projection of the suction port side impeller 25. In accordance with the shape of the convex fitting portion, both ends of the connecting pipe 28 are cut out, and the connecting pipe 28 is connected to the convex fitting portion 32 of the suction side protrusion of the impeller 24 on the discharge port side. The concave fitting portion 33 is inserted, and the convex fitting portion 32 of the discharge port side projection of the impeller 25 on the suction port side is inserted into the concave fitting portion 33 on the suction port side of the connection pipe 28. Thus, the discharge-side impeller 24 and the suction-side impeller 25 can be connected, and the power of the discharge-side impeller 24 can be transmitted to the suction-side impeller 25 so as to rotate integrally. Even if the same blade is used, the interval between the impellers can be freely adjusted by changing the length of the connecting pipe.

  Therefore, by inserting the connecting pipe 28 between the discharge-side impeller 24 and the suction-side impeller 25, it is possible to easily assemble and to facilitate maintenance and inspection. Can be provided.

(Example 2)
As shown in FIG. 1, there is a bathtub 1 made of artificial marble, stainless steel, FRP (fiber reinforced plastic) or the like, and a pump 3 for sucking and discharging bathtub water 2 in the bathtub 1 outside the bathtub 1. And the heating part 4 using the gas for heating the bathtub water 2, electricity, kerosene, etc. is installed.

  An outlet 5 for bath water 2 is attached to the lower side surface of the bathtub 1, and a circulation path 6 made of heat-resistant PVC (vinyl chloride), stainless steel or the like is connected to the outlet 5.

  A pump 3 is attached in the middle of the circulation path 6, and the circulation path 6 is further connected to the heating unit 4.

  A circulation return path 7 made of heat-resistant polyvinyl chloride (vinyl chloride), stainless steel or the like is connected to the heating unit 4, and the circulation return path 7 is an inflow port attached to the side of the bathtub 1 and above the outflow port 5. 8 is connected.

  As shown in FIGS. 2 and 3, a polyphenylene sulfide (PPS) in which a suction port 11 and a discharge port 12 for bath water 2 are provided on the upper side of the main body 9 of the pump 3 and a pump unit 13 that sucks and discharges bath water 2 is built in. A pump case 14 made of metal such as plastic or stainless steel is disposed.

  On the lower side, a motor unit 10 serving as a driving source for the pump 3 is housed, and the motor unit 10 and the pump unit 13 are separated from each other to prevent the bath water 2 from entering the motor unit 10 from the pump unit 13. A waterproof partition 15 made of a metal, heat resistant plastic or the like is provided.

  The motor unit 10 includes a cylindrical stator 16 that generates a magnetic field, a control unit 17 that controls the stator 16, a resin 18 that is injected and cured to protect the stator 16 and the control unit 17, and the exposure of the resin 18. The stator 16 is attached to the inside of the waterproof partition 15 in a concave shape.

  A control unit 17 including electronic components 20 and 21 such as a transformer and a transistor is attached to the lower side of the stator 16.

  On the other hand, the pump unit 13 includes a cylindrical rotor 22 made of a permanent magnet and driven by a magnetic field generated by the stator 16, and a plurality of blades 23 attached to the surface integrally with the rotor 22 are formed. .

  The cylindrical discharge port side impeller 24 made of plastic such as PPS that sucks and discharges the bathtub water 2 by the plurality of blades 23 and the cylindrical intake port side impeller 25 also made of plastic such as PPS. Is attached.

  There is a disc-shaped partition plate 26 made of a metal such as stainless steel that partitions the impeller 24 on the discharge port side and the impeller 25 on the suction port side, and discharges water discharged from the impeller 25 on the suction port side in the peripheral direction. A guide vane 27 made of plastic such as PPS for guiding water to the central suction port of the side impeller 24 is disposed.

  Between the discharge-side impeller 24 and the suction-side impeller 25, a cylindrical connection made of plastic such as PPS that connects the discharge-side impeller 24 and the suction-side impeller 25. A tube 28 is arranged.

  A bearing 29 made of baked carbon or molded carbon is attached to the center of rotation of the impeller 24 on the discharge port side and the impeller 25 on the suction port side, and the rotor 22, the impeller 24 on the discharge port side, and the suction port. A cylindrical shaft 30 made of a metal such as stainless steel that rotatably supports the mouth-side impeller 25 is disposed.

  Further, on both sides of the shaft 30, a hollow disk-shaped bearing plate 31 made of ceramic or the like that is in sliding contact with the bearing 29 is attached.

  Further, the rotor 22 is installed so as to face the stator 16 through the waterproof partition 15.

  Here, as shown in FIG. 4, the discharge-side impeller 24 and the suction-side impeller 25 are joined to the suction-side protrusion of the discharge-side impeller 24 and the suction-side impeller 25. A cross-shaped convex fitting portion is provided on the discharge port side protrusion, and both ends of the connection pipe 28 are cut out in accordance with the shape of the convex fitting portion, and the suction of the impeller 24 on the discharge port side The concave fitting portion 33 of the connection pipe 28 is inserted into the convex fitting portion 32 of the mouth side protrusion, and the discharge of the impeller 25 on the suction side is inserted into the suction side concave fitting portion 33 of the connection pipe 28. The convex fitting portion 32 of the outlet side protrusion is inserted.

  Therefore, the connecting pipe 28 is inserted between the impeller 24 on the discharge port side and the impeller 25 on the suction port side, and is connected, whereby the power of the impeller 24 on the discharge port side is transferred to the impeller 25 on the suction port side. The distance between the impellers can be freely adjusted by changing the length of the connecting pipe even if the same blade is used.

  Further, as shown in the simplified exploded perspective view of the guide vane and the partition plate shown in Embodiments 1 and 2 in FIG. 5, a groove 34 is formed in the periphery of the inner step portion of the waterproof partition 15, and the groove 34 is located at the position of the groove 34. In addition, a partition plate 26 having the same shape as that of the groove 34 and having a peripheral portion cut out is placed, and a guide blade 27 having a convex fitting portion 35 having the same shape as the groove 34 is provided on the partition plate 26. The convex fitting portion 35 is inserted, the circumferential positioning of the partition plate 26 is fixed, and an annular convex fitting portion 36 is provided in the peripheral portion of the pump case 14, and this convex fitting is provided. The step 37 provided in the peripheral part of the guide blade 27 is pressed by the part.

  Accordingly, the partition plate 26 and the guide vane 27 are fixed by sealing the pump case 14 and the waterproof partition 15 with an O-ring to prevent water leakage and fixing the periphery with screws or welding.

  In the above configuration, the operation of the pump in the second embodiment and the bathtub water circulation device including the pump will be described with reference to FIGS.

  When the stator 16 controlled by the control unit 17 in the pump 3 generates a magnetic field, the rotor 22 is rotationally driven by the magnetic field.

  When the rotor 22 is rotationally driven, the discharge port side impeller 24 integrally formed with the rotor 22 is also rotationally driven, and the inlet tube side impeller 25 is rotationally driven by the connecting pipe 28 to thereby pump the pump. 3 is driven.

  When the pump 3 is driven, the bathtub water 2 flows into the circulation forward path 6 from the outlet 5 attached to the lower side surface of the bathtub 1, flows through the circulation forward path 6, and is an inlet 11 installed on the upper side surface of the pump 3. Then, the air is sucked into the impeller 25 on the suction port side in the pump 3.

  The sucked bathtub water 2 is pumped in the circumferential direction by a plurality of blades 23 formed on the surface of the rotating inlet side impeller 25 and is provided to the peripheral notch by the blades provided around the guide blades 27. Water is introduced, water is led from this notch to the suction chamber of the impeller 24 on the discharge port side separated by the guide vane 27 and the partition plate 26, and the discharge port pump is provided by the return vane provided on the discharge port side of the guide vane 27. The water is introduced into the central suction port and sucked into the impeller 24 on the discharge port side.

  The sucked bathtub water 2 is pumped in the circumferential direction by a plurality of blades 23 formed on the surface of the rotating discharge port side impeller 24 and discharged outside the pump 3 from the discharge port 12 arranged on the side surface. .

  The discharged bath water 2 is introduced into a heating unit 4 using gas, electricity, kerosene or the like through a circulation path 6 connected to a discharge port 12 and heated to a predetermined temperature, and then the heating unit 4 And flows into the bathtub 1 from the inlet 8 attached to the upper side of the outlet 5 on the side surface of the bathtub 1.

  In this way, the bathtub water 2 is circulated by using the pump 3 and heated to a predetermined temperature in the heating unit 4, thereby heating the bathtub water 2 in the bathtub 1 to a predetermined temperature, and the bathtub water after the heating. By continuing the circulation of 2, it becomes possible to always maintain the temperature of the bath water 2 at a predetermined temperature.

  As described above, according to the second embodiment, a cross-shaped convex fitting portion is provided on the suction port side projection of the discharge port side impeller 24 and the discharge port side projection of the suction port side impeller 25. In accordance with the shape of the convex fitting portion, both ends of the connecting pipe 28 are cut out, and the connecting pipe 28 is connected to the convex fitting portion 32 of the suction side protrusion of the impeller 24 on the discharge port side. The concave fitting portion 33 is inserted, and the convex fitting portion 32 of the discharge port side projection of the impeller 25 on the suction port side is inserted into the concave fitting portion 33 on the suction port side of the connection pipe 28. Thus, the discharge-side impeller 24 and the suction-side impeller 25 can be connected, and the power of the discharge-side impeller 24 can be transmitted to the suction-side impeller 25 so as to rotate integrally. Even if the same blade is used, the interval between the impellers can be freely adjusted by changing the length of the connecting pipe.

  Therefore, by inserting the connecting pipe 28 between the discharge-side impeller 24 and the suction-side impeller 25, it is possible to easily assemble and to facilitate maintenance and inspection. Can be provided.

  Further, a groove 34 is formed in the peripheral portion of the inner stepped portion of the waterproof partition wall 15, and a partition plate 26 having a peripheral portion cut out in the same shape as the groove 34 is placed in accordance with the position of the groove 34. A guide blade 27 having a convex fitting portion 35 having the same shape as the groove 34 is provided in the peripheral portion, the convex fitting portion 35 is inserted, and the circumferential positioning of the partition plate 26 is fixed. Further, an annular convex fitting portion 36 is provided in the peripheral portion of the pump case 14, and the step portion 37 provided in the peripheral portion of the guide vane 27 is pressed by the convex fitting portion so that the pump case 14 and the waterproof partition 15 are provided. The O-ring is sealed to prevent water leakage, and the periphery is fixed with screws or welding, whereby the partition plate 26 and the guide vane 27 can be fixed.

  Therefore, it is possible to easily assemble the guide vane and the partition plate without using screws, and to provide a convenient and low-cost pump that can be easily maintained and inspected.

  In the above embodiment, the shape of the convex fitting portion 32 of the suction port side projection of the discharge port side impeller 24 into which the connection pipe 28 is inserted and the discharge port side projection of the suction port side impeller 25 is formed. However, the same effect can be obtained by providing Y-shaped, I-shaped, or a large number of convex fitting portions.

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

  The pump of the present invention can be expected to be applied to various pumps used in, for example, a fuel cell device and a heat pump device, and a liquid supply device including the pump.

Overall schematic diagram of a bath water circulation device shown in Examples 1 and 2 Sectional drawing of the pump shown in Examples 1 and 2 Simplified exploded perspective view of the pump shown in Examples 1 and 2 Simplified exploded perspective view of impeller and connecting pipe shown in Examples 1 and 2 Simplified exploded perspective view of guide vanes and partition plate shown in Examples 1 and 2

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bathtub 2 Bath water 3 Pump 4 Heating part 9 Main body 10 Motor part 13 Pump part 14 Pump case 15 Waterproof partition 16 Stator 17 Control part 22 Rotor 24 Impeller on discharge side 25 Impeller on suction side 26 Partition plate 27 Guide Blade 28 Connection pipe 29 Bearing 30 Shaft 31 Bearing plate 32 Convex fitting part of projection part 36 Ring convex fitting part

Claims (3)

A pump unit including at least two impellers for sucking and discharging liquid in series; a pump case in which the pump unit is housed and a liquid suction port and a discharge port are disposed; and a motor unit for driving the pump unit A hollow protrusion having a predetermined inner diameter and length at a center portion of the impeller facing each other, and a shaft that penetrates the protrusion and the impeller to rotatably support the impeller, A convex fitting portion having a predetermined width and length is provided on the surface of the blade, and a concave fitting portion for fitting with the convex fitting portion is formed at both ends, and the opposing protrusions are connected to each other to connect the impeller A pump characterized in that a connecting pipe for integrally rotating the is arranged. Between the impeller, a guide vane that introduces the liquid discharged from the impeller on the suction port side into an adjacent impeller on the discharge port side, and the liquid discharged from the impeller on the discharge port side is a vane on the suction port side. A partition plate that prevents backflow to the vehicle is provided, and an annular protrusion having a predetermined height for fixing the guide vane and the partition plate to the pump case is disposed at a predetermined position inside the pump case. The pump according to claim 1. A liquid supply apparatus comprising the pump according to claim 1.

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