JP3769138B2 - Pump device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pump device, and more particularly to a pump device suitable for a bus pump in a washing machine.
[0002]
[Prior art]
In a conventional washing machine, for example, a fully automatic washing machine, as a fluid pump for pumping a cleaning fluid to a washing part, for example, there is provided a bath pump that pumps hot water from a bath and supplies it to the washing part. Such a bus pump conventionally constitutes a pump device by assembling pump parts to a DC brush motor. Such a conventional pump device is disclosed in, for example, Japanese Patent Application Laid-Open Nos. 8-135590 and 10-196582.
[0003]
[Problems to be solved by the invention]
The conventional pump device disclosed in Japanese Patent Application Laid-Open No. 8-135590 and the like has a structure in which a single motor is integrated into a pump case so that it is difficult to align the output shaft of the motor and the impeller. It has become a thing. Insufficient center alignment has drawbacks such as increased noise and shorter durability time. Further, since separate parts are required for holding the motor, the number of assembling steps is increased and the cost is increased.
[0004]
The conventional pump device uses a DC brush motor, but this motor has the following drawbacks.
[0005]
1) The brush is worn and the durability is not good.
2) Electric noise is generated by brush sparks.
3) If the brush is present, it cannot be completely sealed, so that there is a risk of water entering. If water enters, an electrical short circuit or the like occurs, which is dangerous.
4) Noise is generated from the brush and commutator.
[0006]
Therefore, an object of the present invention is to provide a pump device that is less likely to generate noise and that can improve durability. Another object of the present invention is to provide a pump device in which the number of parts and the number of assembly steps are reduced and the cost is reduced.
[0007]
[Means for Solving the Problems]
  In view of the above-described object, in the pump device of the present invention, an impeller is provided on the output shaft of the motor, and in the pump device that feeds fluid by rotationally driving the impeller, a casing constituting the pump portion of the pump deviceIs provided with an extension portion of one member extending in the axial direction when the output shaft is installed, and a pair of bearing devices are provided on the inner wall side of the extension portion. The rotating shaft is rotatably supported by the bearing device, and a stator core is supported on the outer wall side of the extending portion.This facilitates good alignment of the motor output shaft and the impeller system, and makes it difficult to generate noise. In addition, the pump device has good durability.
[0008]
  In other inventions,In a pump device in which an impeller is provided on an output shaft of a motor and fluid is delivered by rotationally driving the impeller, a bearing device that rotatably supports the output shaft by a part of a casing constituting a pump portion of the pump device And a seal member that seals around the output shaft and prevents the flow of fluid in the impeller chamber surrounding the impeller is supported coaxially with the output shaft and by a part of the casing. This facilitates good alignment of the motor output shaft and the impeller system, and makes it difficult to generate noise. In addition, the pump device has good durability. Further, since the seal member and the bearing device or stator core that supports the output shaft of the motor are fixed and held in the same casing, it is easy to secure the concentricity of each component. For this reason, generation | occurrence | production of noise reduces and durability improves.
[0009]
  In other inventions,In addition to the above-described invention, a seal member that seals around the output shaft and prevents fluid leakage in the impeller chamber surrounding the impeller, and prevents leakage of fluid leaking from the seal member to the motor drive side A draining plate is provided coaxially with the output shaft, and the outer diameter of the draining plate is made smaller than the inner diameter of the seal member. For this reason, it becomes possible to insert an output shaft in a sealing member in the state which attached the draining board to the output shaft, and an assembly property improves.
[0010]
Furthermore, in another invention, in addition to the above-mentioned invention, a draining plate that prevents fluid leaking from the seal member from flowing out to the motor drive side is provided coaxially with the output shaft, and the outer diameter of the draining plate is reduced. It is smaller than the inner diameter of the seal member. For this reason, it becomes possible to insert an output shaft in a sealing member in the state which attached the draining board to the output shaft, and an assembly property improves.
[0011]
  In other inventions,A lead wire for supplying electric power to the motor is sandwiched and fixed by a part of the casing constituting the pump part of the pump device and the motor side casing covering the driving part of the motor. Thereby, fixation of a lead wire becomes reliable and easy.
[0013]
In another invention, in addition to the pump device of each of the above-described inventions, the casing is formed by mixing a resin with a member having better thermal conductivity than the resin alone. Thereby, the temperature rise of a motor can be prevented. Furthermore, in another invention, in addition to the pump device of each of the above-described inventions, the motor is a three-phase brushless motor and an outer rotor type. For this reason, the generation of noise is further reduced and the durability is further improved. In addition, since the portion that holds the stator core is in the center, it is easy to achieve a structure that can simultaneously hold both the output shaft of the motor and the stator core.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the pump device of the present invention will be described with reference to FIGS. 1 is a longitudinal sectional view of the pump device of the present invention, FIG. 2 is a plan view, FIG. 3 is a right side view, and FIG. 4 is a left side view.
[0015]
The pump device according to the present invention is not a structure in which a pump and a motor, which are separate parts, are assembled as in the prior art, but is characterized in that the pump and the motor are integrated.
[0016]
The pump device of the present invention is a bus pump as a fluid pump incorporated in the washing machine 1 described later, and is a self-priming pump device in the illustrated example. The pump device includes a pump-side casing 11, a check valve 12 locked to a part of the inner wall of the pump-side casing 11, a lid 13 fitted to the periphery of the inner wall 11 a of the pump-side casing 11, and the pump side An intermediate casing 14 coupled to the casing 11, a resin impeller 15, a blade portion 16 formed on the impeller 15, a pipe (sliding ring) 17, a rubber oil seal 18 as a seal member, A pump part is formed from the draining plate 19.
[0017]
The motor unit of the pump device includes radial bearings 20 and 21 as bearing devices, a thrust washer 22, a motor-side casing 23 coupled to the intermediate casing 14, a rotor magnet 24, a rotor case 25, The motor 26 is composed of a shaft 26, a stator core 27, a bobbin 28, a winding 29, a substrate 30, a Hall IC 31 and a lead wire 32.
[0018]
In the pump part surrounded by the pump side casing 11 and the intermediate casing 14, a suction hole 33 for sucking liquid or air into the impeller chamber 37, a water suction port 34 formed by the inner wall of the pump side casing 11, a water suction chamber 35, and A discharge chamber 36, an impeller chamber 37 formed by the inner wall of the intermediate casing 14 and the lid 13, a seal 38 for preventing liquid leakage, a discharge port 39, and a water injection port 40 for injecting water for self-priming. Is provided.
[0019]
The pump-side casing 11 and the intermediate casing 14 are tightened and integrated with screws 41, and the pump-side casing 11, the intermediate casing 14, and the motor-side casing 23 are tightened and integrated with screws 42.
[0020]
The intermediate casing 14 has a cylindrical extension 14a extending inwardly toward the pump-side casing 11, a cylindrical extension 14b extending outward from the extension 14a, and an extension 14b. And a cylindrical extending portion 14c having an outer diameter smaller than that of the extending portion 14b.
[0021]
Next, the detailed structure and assembly method of this pump apparatus will be described.
[0022]
First, each component which forms an outer rotor type motor is attached to the extension part 14c of the intermediate casing 14. That is, on the outer wall of the extending portion 14 c of the intermediate casing 14, there is a stator core group (stator core 27, bobbin 28, winding 29 wound around the bobbin 28, substrate 30 attached to the bobbin 28, and substrate 30. The connected Hall IC 31 and the lead wire 32 are inserted first from the lead wire 32 side, and the stator core 27 and the extending portion 14c are fixed by a joining means such as ultrasonic welding.
[0023]
Next, radial bearings 20 and 21 as bearing devices are fixed to both ends of the inner wall of the extending portion 14c by a joining method such as press fitting. Next, the oil seal 18 is assembled into the extending portion 14b.
[0024]
Thereafter, the shaft 26 of the rotor set is inserted through the radial bearings 20 and 21 so as to extend to the extending portion 14 b of the intermediate casing 14. At one end of the shaft 26, a thrust washer 22 and a rotor set (consisting of a rotor case 25 to which a magnet 24 is attached and a shaft 26) are inserted and fixed. From the side opposite to the insertion of the rotor assembly, the impeller assembly (impeller 15, impeller boss 15a integrally formed so as to extend from the impeller 15 in a tapered shape, a pipe 17, and the vicinity of the tip of the impeller boss 15a is press-fitted. Are inserted into the rotor assembly shaft 26 and fixed to the shaft 26 of the rotor set by press fitting or the like.
[0025]
The motor having the above structure constitutes a three-phase DC brushless motor. As shown in the connection diagram of FIG. 5, the winding 29 is composed of windings A, B, and C that are star-connected and supplied with a three-phase voltage. The three Hall ICs 31 are respectively arranged between the windings A, B and C and supplied with a DC power supply (for example, 5 volts).
[0026]
An oil seal 18 is fixed to the inner wall of the extended portion 14b of the intermediate casing 14 by a joining method such as press fitting. Further, the thrust washer 22 and the impeller set are press-fitted and fixed to the other end of the shaft 26, but a knurl for reinforcing press-fitting is formed in the portion of the shaft 26 to which the impeller boss 15a is fixed. ing.
[0027]
The pipe 17 is for preventing wear due to contact between the rubber oil seal 18 and the rotating resin impeller boss 15a, and a material having a certain degree of hardness difference from the material of the oil seal 18, for example, stainless steel is used in this example. The impeller 15 and the impeller boss 15a are integrated with each other by insert molding or the like.
[0028]
The oil seal 18 is a seal member that is coaxial with the shaft 26 and is held by the extending portion 14 b of the casing 14, and prevents fluid such as water from leaking from the pump side, that is, the impeller chamber 37, to the motor side. . Should a water leak occur, for example, the fluid transmitted from the pipe 17 to the tapered portion of the impeller boss 15a reaches the drain plate 19 press-fitted into the impeller boss 15a, and is blown away by centrifugal force by the rotation of the drain plate 19. It is.
[0029]
The outer diameter of the draining plate 19 is smaller than the inner diameter of the oil seal 18. This is to facilitate insertion of the impeller assembly when it is inserted through the central hole of the oil seal 18. Since the drain holes 14d and 23a are formed in the lower surfaces of the intermediate casing 14 and the motor side casing 23, the leaked water is discharged from the drain holes 14d and 23a.
[0030]
The motor side casing 23 covers the rotor portion of the outer rotor type motor. The motor-side casing 23 is screw-fixed by co-tightening that integrates the three when the pump-side casing 11 and the intermediate casing 14 are coupled. In this fixing, the lead wire 32 is pinched and fixed by the intermediate casing 14 and the motor side casing 23.
[0031]
In the above structure, the oil seal 18, the radial bearings 20 and 21 that rotatably support the shaft 26, and the stator core 27 are fixed and held on the extensions 14 b and 14 c of the intermediate casing 14. Ensuring concentricity of parts becomes easy.
[0032]
Next, the operation of the pump device having the above structure will be described.
[0033]
First, priming water is supplied from the water inlet 40, and the water absorption chamber 35, the discharge chamber 36, and the impeller chamber 37 are filled with priming water, or at least the impeller chamber 37 is filled with priming water. Next, a voltage is supplied to the lead wire 32 to start the motor, and the shaft 26 is rotated, whereby the impeller 15 is also rotationally driven to enter a self-priming operation state.
[0034]
Due to the rotation of the impeller 15, the water absorption chamber 35 becomes negative pressure, and air is first sucked from a water absorption hose (not shown) connected to the water inlet 34 by opening the check valve 12. Subsequently, the mixed air and water or air is sucked into the impeller 15 from the suction hole 33. Thereby, air and water are mixed and discharged to the discharge chamber 36 through the impeller chamber 37. At this time, light air accumulates in the upper part of the discharge chamber 36 and is then discharged from the discharge port 39. In this manner, only the air out of the priming water and the air discharged to the discharge chamber 36 by the impeller 15 is discharged from the discharge port 39. When air is discharged, water gradually rises in the water absorption hose.
[0035]
Thereafter, when all the air in the water absorption hose is discharged and the water absorption hose is filled with water, the self-priming operation state is changed to a steady water supply operation state, and water from the water intake port 34 is continuously discharged from the discharge port 39. Is done.
[0036]
As described above, the embodiment of the present invention has been described, but the present invention is not limited to this, and various modifications and applications are possible. For example, although the self-priming pump is used in the embodiment, the present invention is not limited to this and can be applied to general pumps.
[0037]
In addition, as a material of each casing 11, 14, 23, a resin simple substance may be used, but in order to prevent a temperature rise of a glass-filled PBT resin mixed with glass which is a hard material or a motor part, it is more heated than a resin simple substance. A material having excellent conductivity, for example, a composite material such as PPS resin containing alumina mixed with alumina may be used. Further, by filling the stator core portion with a resin having a good thermal conductivity by potting to form a molded motor structure, the temperature rise can be reduced or the waterproof effect can be enhanced.
[0038]
Moreover, although the motor part has an outer rotor structure in this embodiment, it can also have an inner rotor structure. Moreover, it is good also as a sensorless motor using a back electromotive force etc. instead of the three-phase brushless motor using a Hall element. The present invention can also be applied to a brushed motor similar to the conventional one.
[0039]
Next, the washing machine 1 incorporating the pump device of the present invention described above will be described with reference to FIGS.
[0040]
FIG. 6 is an electrical block diagram of the washing machine. The washing machine 1 includes an inverter unit 3 connected to a DC power source 2, a control circuit 4 including a microcomputer, a main body motor 5 serving as a washing member motor, and a bus pump motor serving as a fluid pump motor (FIG. 1). To 6), a motor changeover switch 7 serving as a first switch means, and a position detection means changeover switch 8 serving as a second switch means. Here, the inverter unit 3 and the control circuit 4 form a control unit.
[0041]
The DC power supply 2 rectifies commercial AC power by a rectifier circuit (not shown) and supplies a DC voltage. The inverter unit 3 includes six motor control switches (elements) 3a, 3b, 3c, 3d, 3e and 3f connected to the DC power source 2. The two motor control switches 3a and 3b are connected in series between the DC power source 2 and the ground. Similarly, motor control switches 3c and 3d and motor control switches 3e and 3f are also connected in series between the DC power source 2 and the ground. The six motor control switches 3a, 3b, 3c, 3d, 3e and 3f are connected as described above to form a three-phase bridge configuration.
[0042]
The main body motor 5 is a three-phase DC brushless motor provided with rotor position detection means (not shown) such as a Hall IC (an integrated circuit including a Hall element as a position detection sensor) or the like. This is for driving a washing member (not shown) such as a washing tub. The Hall IC power supply is supplied to the Hall IC in the main body motor 5.
[0043]
The bus pump motor 6 is a motor having a configuration similar to that of the main body motor 5 and includes a rotor position detection means (not shown) such as a Hall IC (an integrated circuit including a Hall element as a position detection sensor). It consists of a phase DC brushless motor. This bus pump motor 6 is for driving a bus pump (not shown) which is a fluid pump that pumps up hot water or water from the bath and supplies it to the washing site. The Hall IC power supply is supplied to the Hall IC in the bus pump motor 6.
[0044]
The motor changeover switch 7 is composed of a triple switch, and has common terminals 7a, 7b and 7c and contacts 7d, 7e, 7f, 7g, 7h and 7i. The common terminals 7a, 7b and 7c of the motor changeover switch 7 are respectively connected to a connection point A of the motor control switches 3a and 3b, a connection point B of the motor control switches 3c and 3d, and a connection point C of the motor control switches 3e and 3f. It is connected to the. The contacts 7d, 7f and 7h of the motor changeover switch 7 are connected to three stator coils (not shown) of the main body motor 5, respectively. Similarly, the contacts 7e, 7g and 7i of the motor changeover switch 7 are connected to three stator coils (not shown) of the bus pump motor 6, respectively.
[0045]
The position detection means changeover switch 8 is composed of a triple switch, and has common terminals 8a, 8b and 8c and contacts 8d, 8e, 8f, 8g, 8h and 8i. Common terminals 8 a, 8 b and 8 c of the position detection means changeover switch 8 are connected to the control circuit 4. The contacts 8d, 8f and 8h of the position detecting means changeover switch 8 are connected to the rotor position detecting means of the main body motor 5, respectively, and the contacts 8e, 8g and 8i are connected to the rotor position detecting means of the bus pump motor 6, respectively. Has been. The motor changeover switch 7 and the position detection means changeover switch 8 are only switches for switching the connection, and do not need to be turned on / off when energized, and thus are inexpensive switches.
[0046]
The control circuit 4 composed of a microcomputer or the like operates according to a washing program and a fluid pump operation program stored in advance in a built-in memory (not shown). The control circuit 4 receives position signals from the position detection means of the main body motor 5 and the bus pump motor 6 via the position signal changeover switch 8. In addition, the control circuit 4 supplies on / off control signals to the motor control switches 3a to 3f of the inverter unit 3, and supplies switching control signals to the motor changeover switch 7 and the position detection means changeover switch 8 to perform interlocking switching. I do.
[0047]
Next, the operation of the washing machine 1 will be described based on the flowcharts of FIGS.
[0048]
When the washing machine 1 is powered on (step S1), the motor changeover switch 7 and the position detection means signal changeover switch 8 are switched to the main body motor 5 side. The control circuit 4 operates a washing program in accordance with, for example, a water flow changeover switch operation or a dehydration switch operation of the washing machine and an operation time setting operation (step S2) of a timer set as appropriate, and an operation according to the program. Is started (step S3). And a control signal is supplied to the inverter part 3, and each motor control switch 3a-3f is controlled on / off (step S4). This washing program is designed to cause the washing machine 1 to automatically perform a series of operations such as water supply, washing and dehydration time control in addition to the on / off control of the inverter unit 3. You may make it perform only work.
[0049]
The motor control switches 3a to 3f of the inverter unit 3 are ON / OFF controlled by a control signal from the control circuit 4 to convert the DC voltage of the DC power source 2 into a waveform composed of three-phase frequencies / voltages. The converted voltages having respective waveforms are connected from the connection points A, B and C of the motor control switch to the motor changeover switch 7, respectively, from the common terminal 7a to the contact 7d, from the common terminal 7b to the contact 7f, and from the common terminal 7c to the contact. It is supplied to each stator coil of the main body motor 5 via 7h.
[0050]
Further, the position signal from the position detecting means of the main body motor 5 is supplied to the control circuit of the position detecting means changeover switch 8 via the contact 8d through the common terminal 8a, the contact 8f through the common terminal 8b, and the contact 8h through the common terminal 8c, respectively. 4 is input. The control circuit 4 supplies control signals for controlling the switching timing to the motor control switches 3a to 3f based on the input position signal.
[0051]
Thereby, the main body motor 5 rotates at a rotation speed depending on the three-phase voltage waveform (step S5). For example, the main body motor 5 turns on the motor control switches 3a and 3b of the inverter unit 3 according to the control signal of the control circuit 4, then turns on the motor control switches 3c and 3d, and turns on the motor control switches 3e and 3f. Thus, it is driven to rotate in the forward direction with the voltage obtained from each of the connection points A, B and C. Further, the main body motor 5 rotates in the reverse direction by switching the motor control switches 3a to 3f in the reverse order of the previous order by the control signal of the control circuit 4.
[0052]
As the main body motor 5 rotates, a washing member such as a washing wing or a washing tub connected to the rotor of the main body motor 5 is driven so as to have a desired water flow speed during washing or a rotation speed for dehydration (step S6). ). The rotation of the main body motor 5 at the time of washing is several tens to several hundred times / minute, and at the time of dehydration, it is several hundred times / minute. When the washing program ends (step S7), a predetermined series of operations ends.
[0053]
Next, when it is desired to use the bus pump, after the power is turned on (step S1), an operation switch (not shown) for driving the bus pump is turned on (step S11). In response to the ON operation, the control circuit 4 operates the fluid pump operation program, supplies a switching signal to the motor changeover switch 7 and the position detection means changeover switch 8, and both the switches 7 and 8 are connected from the main body motor 5 side to the bus. Switch to the pump motor 6 side (step S12).
[0054]
Next, the control circuit 4 starts the operation of the fluid pump operation program (step S13). Note that this fluid pump operation program gives the inverter unit 3 control suitable for the operation of the bus pump motor 6. The control circuit 4 supplies a control signal suitable for driving the bus pump to the inverter unit 3 so as to turn on / off the motor control switches 3a to 3f (step S4).
[0055]
The motor control switches 3a to 3f of the inverter unit 3 are ON / OFF controlled by a control signal from the control circuit 4 so that the DC voltage of the DC power source 2 is changed to a three-phase voltage having a frequency / voltage suitable for bus pump driving. Convert. The converted three-phase voltages are obtained from the connection points A, B and C of the motor control switch to the motor changeover switch 7, respectively, from the common terminal 7a to the contact 7e, from the common terminal 7b to the contact 7g, and from the common terminal 7c to the contact 7i. Is supplied to each stator coil of the bus pump motor 6.
[0056]
Further, the position signal from the position detection means of the bus pump motor 6 is controlled by the position detection means changeover switch 8 via the contact 8e through the common terminal 8a, the contact 8g through the common terminal 8b, and the contact 8i through the common terminal 8c, respectively. Input to the circuit 4.
[0057]
Thereby, the bus pump motor 6 rotates at a rotation speed depending on the three-phase voltage (step S15). The rotational speed of the bus pump motor 6 is much higher than the rotational speed of the main body motor 5 and is about 7,000 to 10,000 times / minute. At this time, the bus pump motor 6 receives the same control as the control of the main body motor 5 by the motor control switches 3a to 3f of the inverter unit 3 according to the control signal of the control circuit 4, and rotates forward or reverse. Since the bus pump motor 6 performs a water absorption operation, the bus pump motor 6 does not need to be driven to rotate in both directions, and is driven so as to rotate only in one direction, that is, only one of forward rotation and reverse rotation. As the control signal from the control circuit 4 is supplied to the inverter unit 3 by high-speed switching, the rotational speed of the bus pump motor 6 is considerably higher than the rotational speed of the main body motor 5 as described above.
[0058]
The bus pump connected to the rotor of the bus pump motor 6 is driven by the rotation of the bus pump motor 6 (step S16). Thereby, hot water in the bath is drawn up and supplied to the washing tub for washing the laundry (step S17).
[0059]
Thereafter, when it is desired to stop the bus pump, the operation switch for driving the bus pump is turned off (step S18), and accordingly, the control circuit 4 turns the motor changeover switch 7 and the position detection means changeover switch 8 on. Switch again to the main body motor 5 side (step S19). Thereby, the bus pump motor 6 is not supplied with the three-phase voltage from the inverter unit 3 and stops (step S20). Accordingly, the bus pump is also stopped, and the hot water or water supply to the washing tub is stopped.
[0060]
At this time, the control circuit 4 does not supply a control signal to the inverter unit 3 and waits for instructions by operating various operation switches for the next washing operation.
[0061]
As mentioned above, although embodiment of the pump apparatus of this invention and the application example of the said pump apparatus were demonstrated, this invention is not limited to this, A various deformation | transformation implementation is possible in the range which does not deviate from the summary. For example, as shown in FIG. 9, the casing may be composed of two pump side casings 11 and a motor side casing 51, and the bottom of the motor side casing 51 may be closed with a lid 52. 9, the same reference numerals as those shown in FIGS. 1 to 4 denote the same members.
[0062]
In addition to the washing machine, the pump device of the present invention can be applied to a simple pump for a bus, can be used to pump water from a pond or a river, and can be applied to various uses and devices.
[0063]
【The invention's effect】
In the pump device of the present invention, since the bearing device for the output shaft of the motor is held in the casing constituting the pump unit, it is easy to ensure concentricity between the output shaft of the motor and the impeller. In the pump device of another invention, since the stator core is held by the casing constituting the pump portion, the number of parts is reduced, and an inexpensive pump is possible. Further, the total assembly including the motor portion is facilitated, and the accuracy is easily obtained.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an embodiment of a pump device of the present invention.
FIG. 2 is a plan view showing an embodiment of the pump device of the present invention.
FIG. 3 is a right side view showing an embodiment of the pump device of the present invention.
FIG. 4 is a left side view showing an embodiment of the pump device of the present invention.
FIG. 5 is a connection diagram of a motor unit of the pump device of the present invention.
FIG. 6 is an electrical block diagram of a washing machine incorporating the pump device of the present invention.
7 is a flowchart when a washing operation (including dehydration) is performed by the washing machine of FIG. 6. FIG.
FIG. 8 is a flowchart when pump driving is performed by the washing machine of FIG. 6;
FIG. 9 is a longitudinal sectional view showing a modified example of the pump device of the present invention.
[Explanation of symbols]
1 Washing machine
4 Control circuit
5 Main body motor (motor for washing member)
6 Bus pump motor (pump device)
11 Pump-side casing (casing constituting the pump part)
12 Check valve
13 Lid
14 Intermediate casing (casing constituting the pump part)
15 Impeller
16 feathers
17 Pipe (sliding ring)
18 Oil seal (seal member)
19 Draining board
20,21 Radial bearing (bearing device)
23 Motor casing
26 Shaft (Output shaft)
27 Stator core
31 Hall IC
33 Suction hole
34 Water intake
35 Water absorption room
36 Discharge chamber
37 Impeller room
39 Discharge port

Claims (7)

In the pump device in which an impeller is provided on the output shaft of the motor, and fluid is sent by rotationally driving the impeller,
The casing constituting the pump part of the pump device is provided with an extension part of one member extending in the axial direction when the output shaft is installed,
A pair of bearing devices are provided on the inner wall side of the extending portion, and the rotary shaft is rotatably supported by the pair of bearing devices,
A stator core is supported on the outer wall side of the extending portion.
A pump device characterized by that.   In the pump device that includes an impeller on the output shaft of the motor and sends out fluid by rotationally driving the impeller,
  While supporting a bearing device that rotatably supports the output shaft by a part of a casing constituting a pump portion of the pump device,
  A pump device characterized in that a seal member that seals around the output shaft and prevents the flow of fluid in an impeller chamber surrounding the impeller is supported coaxially with the output shaft and by a part of the casing.   The output includes a seal member that seals around the output shaft and prevents leakage of fluid in an impeller chamber that surrounds the impeller, and a draining plate that prevents fluid leaking from the seal member from flowing out to the motor drive side. The pump device according to claim 1, wherein the pump device is provided coaxially with the shaft and has an outer diameter smaller than an inner diameter of the seal member.   A draining plate for preventing fluid leaking from the sealing member from flowing out to the motor drive side is provided coaxially with the output shaft, and the outer diameter of the draining plate is made smaller than the inner diameter of the sealing member. The pump device according to claim 2.   The lead wire for supplying electric power to the motor is sandwiched and fixed between a part of a casing constituting the pump part of the pump device and a motor side casing covering the driving part of the motor. The pump device according to any one of 1 to 4. The pump device according to any one of claims 1 to 5 , wherein the casing is formed by mixing a resin with a member having higher thermal conductivity than a resin carrier. The pump device according to any one of claims 1 to 6 , wherein the motor is a three-phase brushless motor and an outer rotor type.

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