JP4750623B2 - Pump device - Google Patents

Description

  The present invention relates to a pump device, and more particularly, to a pump device configured to convey a fluid from a fluid suction port formed in the pump chamber to a fluid discharge port by rotating an impeller accommodated in the pump chamber. .

For example, in a pump device for circulating an aqueous solution, such as an electric water pump for automobiles disclosed in Patent Document 1, when the operating atmosphere is below the freezing temperature of the aqueous solution, the aqueous solution in the pump chamber freezes and expands in volume. As a result, the case and the connecting pipe may be damaged.

  Here, in general, in a pump device to which a resin hose is connected, even if the aqueous solution in the pump chamber expands due to freezing, the pressure increased with the volume expansion escapes to the resin hose side. For this reason, there is little possibility that a case and connection piping will be damaged.

  However, when a metallic piping member is connected to the pump device or when the valve is arranged in the vicinity, the volume of the aqueous solution in the pump chamber increases when the volume expands due to freezing. I cannot expect pressure relief. Therefore, in order to prevent damage to the pump device, it is necessary to increase the strength of the component parts of the pump device. For this purpose, the component parts are generally made of metal.

  However, for example, in the electric water pump disclosed in Patent Document 1, if metal parts are used in a portion that becomes a magnetic gap (for example, a portion between the stator and the rotor or a magnetic coupling portion), iron loss occurs, and pump efficiency is increased. Cause it to worsen.

Further, in general, a rigid body fixing with an O-ring or a metal gasket is often employed for the seal portion of the pump device in order to improve airtightness. However, these structures respond to the increase in the internal pressure of the pump chamber during freezing with the strength of the parts. Therefore, in the case where the pump device is not provided with a pressure escape portion such as a resin hose, the pump device and High pressure is applied to all the piping members connected to the pump device.
JP 2004-162541 A

  The present invention has been made in view of the above problems, and its purpose is to suppress an abnormal increase in the internal pressure of the pump chamber and prevent damage to the pump device as a whole, piping members connected to the pump device, and the like. An object of the present invention is to provide a pump device that can do this.

The pump device according to claim 1 includes a stator housing chamber having a seal structure against a fluid in the pump chamber, and the motor chamber in which the stator is housed in the stator housing chamber and the motor case form the pump chamber. A pump case in which a rotor and an impeller are accommodated in the pump chamber, and a lower pressure resistance than the seal structure, and an internal pressure of the pump chamber provided between the motor case and the pump case. And a relief structure for escaping the fluid in the pump chamber to the outside when the value exceeds a predetermined value.

  In the pump device according to the first aspect, the stator is accommodated in the stator accommodating chamber of the motor case. The stator housing chamber is provided with a seal structure for the fluid in the pump chamber so that the stator housed therein does not come into contact with the fluid. A rotor and an impeller are housed in a pump chamber formed by the motor case and the pump case.

In this pump device, when the rotor is rotated by the magnetic action of the stator and the rotor, the impeller is rotated together with the rotor, and the fluid is conveyed from the fluid suction port formed in the pump chamber to the fluid discharge port by the rotation of the impeller. The Here, in the pump device according to claim 1, for example, when the fluid is an aqueous solution and the use atmosphere is equal to or lower than the freezing temperature of the aqueous solution, a part of the aqueous solution in the pump chamber is frozen to a volume. Inflate.

  However, in the pump device according to the first aspect, a relief structure is provided between the motor case and the pump case to allow the fluid in the pump chamber to escape to the outside when the internal pressure of the pump chamber exceeds a predetermined value. Therefore, as described above, even when a part of the aqueous solution in the pump chamber freezes and expands in volume, the aqueous solution in the pump chamber escapes and is discharged outside from the structure, and an abnormal increase in the internal pressure of the pump chamber is suppressed. This prevents damage to the pump device as a whole, piping members connected to the pump device, etc., even if a member capable of releasing pressure such as a resin hose is not connected to the pump device. Is possible.

  In the pump device according to the first aspect, as described above, since an abnormal increase in the internal pressure of the pump chamber can be suppressed, a metal part is formed in a portion that becomes a magnetic gap (for example, a portion between the stator and the rotor or a magnetic coupling portion). There is no need to use parts, and it is possible to use resin parts. Therefore, by using resin parts for the part that becomes the magnetic gap, it is possible to prevent iron loss from occurring in this part, and to improve the pump efficiency (motor efficiency).

  Furthermore, in the pump device according to the first aspect, as described above, the maximum value of the internal pressure of the pump chamber can be suppressed low by suppressing the abnormal increase in the internal pressure of the pump chamber. The maximum stress applied to the components can also be reduced. For this reason, the strength of each component can be lowered. Therefore, each component does not need to be made of metal, and can be made of resin, so that the weight of the entire pump device can be reduced. Further, the thickness of each part can be reduced without using a high-strength material for each component, and thus the material cost can be reduced.

In addition, in the pump device according to the first aspect , the relief structure for lowering the internal pressure of the pump chamber is set to have a lower pressure resistance than the seal structure provided in the stator housing chamber. Therefore, as described above, when the internal pressure of the pump chamber rises, the relief structure reaches the rated pressure before the seal structure and discharges the fluid in the pump chamber to the outside. This makes it possible to achieve both suppression of an abnormal increase in the internal pressure of the pump chamber and securing of the sealing performance of the stator housing chamber that houses the stator.

The pump device according to claim 2 is the pump device according to claim 1 , wherein the relief structure includes a seal member made of an elastic material, and the internal pressure of the pump chamber is a predetermined value or more. When it becomes, it is comprised so that elastic deformation is possible so that the fluid in the said pump chamber may escape outside.

In the pump device according to claim 2 , the above-described relief structure includes a seal member made of an elastic material, and this seal member allows fluid in the pump chamber to be externally supplied when the internal pressure of the pump chamber becomes a predetermined value or more. It is configured to be elastically deformable so as to escape. Therefore, when the internal pressure of the pump chamber becomes a predetermined value or more, the seal member is elastically deformed and the fluid in the pump chamber is automatically discharged to the outside. Further, when the fluid in the pump chamber is discharged to the outside in this way and the internal pressure of the pump chamber is reduced, the seal member is restored to the original shape, and the sealing performance of the pump chamber is automatically ensured again.

According to a third aspect of the present invention, there is provided a pump device including a stator housing chamber having a seal structure against a fluid in the pump chamber, and the motor chamber in which the stator is housed in the stator housing chamber and the motor case form the pump chamber. A pump case in which a rotor and an impeller are housed in the pump chamber, and a fluid that is provided between the motor case and the pump case when the internal pressure of the pump chamber exceeds a predetermined value. And a fixing structure for fixing the motor case and the pump case so as to be displaceable in a separating direction .

In the pump device according to the third aspect, the stator is housed in the stator housing chamber of the motor case. The stator housing chamber is provided with a seal structure for the fluid in the pump chamber so that the stator housed therein does not come into contact with the fluid. A rotor and an impeller are housed in a pump chamber formed by the motor case and the pump case.
In this pump device, when the rotor is rotated by the magnetic action of the stator and the rotor, the impeller is rotated together with the rotor, and the fluid is conveyed from the fluid suction port formed in the pump chamber to the fluid discharge port by the rotation of the impeller. The Here, in the pump device according to claim 3, for example, when the fluid is an aqueous solution and the use atmosphere is equal to or higher than the freezing temperature of the aqueous solution, a part of the aqueous solution in the pump chamber is frozen to a volume. Inflate.
However, in the pump device according to the third aspect, a relief structure is provided between the motor case and the pump case to allow the fluid in the pump chamber to escape to the outside when the internal pressure of the pump chamber exceeds a predetermined value. Therefore, as described above, even when a part of the aqueous solution in the pump chamber freezes and expands in volume, the aqueous solution in the pump chamber escapes and is discharged outside from the structure, and an abnormal increase in the internal pressure of the pump chamber is suppressed. This prevents damage to the pump device as a whole, piping members connected to the pump device, etc., even if a member capable of releasing pressure such as a resin hose is not connected to the pump device. Is possible.
In the pump device according to the third aspect, as described above, since an abnormal increase in the internal pressure of the pump chamber can be suppressed, a metal part is formed in a portion that becomes a magnetic gap (for example, a portion between the stator and the rotor or a magnetic coupling portion). There is no need to use parts, and it is possible to use resin parts. Therefore, by using resin parts for the part that becomes the magnetic gap, it is possible to prevent iron loss from occurring in this part, and to improve the pump efficiency (motor efficiency).
Furthermore, in the pump device according to the third aspect, as described above, the maximum value of the internal pressure of the pump chamber can be kept low by suppressing the abnormal increase in the internal pressure of the pump chamber. The maximum stress applied to the components can also be reduced. For this reason, the strength of each component can be lowered. Therefore, each component does not need to be made of metal, and can be made of resin, thereby reducing the weight of the entire pump device. Further, the thickness of each part can be reduced without using a high-strength material for each component, and thus the material cost can be reduced.
Moreover, in the pump device according to the third aspect , the motor case and the pump case are fixed by a fixing structure. At this time, the fixing structure fixes the motor case and the pump case so as to be displaceable in a direction in which they are separated. Therefore, as described above, for example, even when the fluid is an aqueous solution and the usage atmosphere is below the freezing temperature of the aqueous solution, and a part of the aqueous solution in the pump chamber freezes and expands in volume, the motor case and the pump case are Separated by the fixed structure, the volume of the pump chamber is increased. Thereby, it is possible to suppress an abnormal increase in the internal pressure of the pump chamber.

The pump device according to claim 4 is the pump device according to claim 3 , wherein the pump chamber includes a fluid suction port at a radially inner portion and a fluid discharge port at a radially outer portion. The seal structure, the relief structure, and the fixing structure are formed in order from the radially inner side to the outer side.

In the pump device according to the fourth aspect , the fluid suction port is provided in the radially inner portion of the pump chamber, and the fluid discharge port is provided in the radially outer portion of the pump chamber. Therefore, when the impeller rotates, the pressure of the fluid is higher in the radially outer portion of the pump chamber than in the radially inner portion. And in the pump apparatus of Claim 4 , the above-mentioned escape structure is arrange | positioned in the radial direction outer side rather than the seal structure. Therefore, when the fluid is transferred from the fluid suction port in the pump chamber to the fluid discharge port by rotating the impeller, the pressure of the fluid in contact with the relief structure is higher than the fluid in contact with the seal structure, so the relief structure is sealed. The rated breakdown voltage can be reached before the structure. As a result, it is possible to reliably suppress the abnormal increase in the internal pressure of the pump chamber while ensuring the sealing performance of the stator housing chamber by the seal structure.

According to a fourth aspect of the present invention, the fixing structure for fixing the motor case and the pump case is arranged further radially outward than the sealing structure and the relief structure. Therefore, it is possible to secure a movable stroke in the direction in which the motor case and the pump case are separated from each other. For example, even when the aqueous solution in the pump chamber is frozen, the volume of the pump chamber can be further increased. Thereby, it becomes possible to more reliably suppress an abnormal increase in the internal pressure of the pump chamber.

  First, the structure of the pump apparatus 10 which concerns on one Embodiment of this invention is demonstrated.

  FIG. 1 is a side cross-sectional view showing an overall configuration of a pump device 10 according to an embodiment of the present invention, and FIG. 2 is an enlarged cross-sectional view of a main part of the pump device 10 according to an embodiment of the present invention. Has been. A pump device 10 according to an embodiment of the present invention is suitably used as an electric water pump for an automobile engine cooling device, for example, and includes a motor case 12 and a pump case 14.

  The motor case 12 includes a case body 16, a stator case 18, and a circuit case 20. The case body 16 includes a concave portion 22 having a circular shape in a plan view and provided coaxially with the rotation axis L. On the bottom surface of the concave portion 22, an annular portion 24 formed in an annular shape around the rotation axis L is projected along the axial direction.

  The stator case 18 includes an annular disk portion 26 disposed around the rotation axis L, and a cylindrical portion 28 (can) protruding in the axial direction from a radially inner portion of the disk portion 26. It is configured. The outer peripheral portion of the disk portion 26 is fitted to the inner peripheral portion on the opening side of the concave portion 22 formed in the case main body 16, and the outer peripheral portion on the protruding end side of the cylindrical portion 28 protrudes from the case main body 16. The annular portion 24 is fitted to the inner peripheral portion.

  As described above, the case body 16 and the stator case 18 are assembled to the motor case 12 to form an annular stator housing chamber 30 surrounded by the case body 16 and the stator case 18. An annular stator 32 is accommodated in the stator accommodating chamber 30 along the inner peripheral surface thereof. The stator 32 is configured by winding a stator coil 36 around a laminated core 34.

  As described above, when the case main body 16 and the stator case 18 are assembled, the first O-ring is provided between the outer peripheral portion of the disk portion 26 and the inner peripheral portion on the opening side of the concave portion 22. 38 is interposed. A second O-ring 40 is interposed between the outer peripheral portion on the protruding end side of the cylindrical portion 28 and the inner peripheral portion of the annular portion 24 protruding from the case body 16. In this embodiment, the seal structure 42 having the first O-ring 38 and the seal structure 44 having the second O-ring 40 are used to prevent the stator housing chamber 30 from being fluidized in the pump chamber 50 to be described later. Sealability is ensured.

  A circuit case 20 is integrally fixed to the case body 16. In the motor case 12 of the present embodiment, a circuit housing chamber 46 is formed by the case body 16 and the circuit case 20, and the stator coil 36 provided in the stator 32 is sequentially energized in the circuit housing chamber 46. The circuit board 48 is accommodated.

  On the other hand, the pump case 14 is provided integrally with the motor case 12, and forms a pump chamber 50 with the motor case 12. The pump case 14 is provided with a fluid suction port 52 and a fluid discharge port 54 that communicate with the pump chamber 50. The fluid suction port 52 is disposed in the center of the pump chamber 50 and extends along the axial direction. Further, the fluid discharge port 54 is disposed at a radially outer portion of the pump chamber 50 and extends along the tangential direction.

  A rotor 56 is rotatably accommodated in the pump chamber 50. The rotor 56 includes a bearing member 58 on the rotation axis L. Then, by inserting the rotating shaft 60 into the bearing member 58, the entire rotor 56 is rotatable. The rotating shaft 60 is fixedly supported by a support portion 62 that projects from the center of the bottom surface of the recess 22 of the case body 16.

  The rotor 56 includes an annular magnet 64 around the rotating shaft 60. The rotor 56 is configured to rotate when the magnet 64 attracts and repels the magnetic force generated from the stator 32. An impeller 66 is integrally provided on the rotor 56. The impeller 66 has a plurality of blades 68 and is configured to convey fluid from the fluid suction port 52 formed in the pump chamber 50 to the fluid discharge port 54 by rotating integrally with the rotor 56. It is.

  Next, a characteristic configuration of the pump device 10 according to the present embodiment will be described in detail with reference to FIG. In the pump device 10 of the present embodiment, as will be described in detail later, a relief structure 70 is provided as a structure for allowing the fluid in the pump chamber 50 to escape to the outside when the internal pressure of the pump chamber 50 exceeds a predetermined value. . The configuration of the relief structure 70 will be described in detail. Between the motor case 12 and the pump case 14, an axial passage 72 and a radial passage 74 that are continuous with the pump chamber 50 are provided. The case body 16 of the motor case 12 is formed with an annular housing groove 76 at a position radially outside the stator housing chamber 30, and an annular gasket 78 is housed in the housing groove 76. .

  The gasket 78 is configured such that the front end thereof is in contact with the flange portion 80 of the pump case 14 and closes the radial passage 74. Further, the relief structure 70 including the gasket 78 is set to have a lower pressure resistance than the seal structures 42 and 44 for sealing the stator accommodating chamber 30. That is, as will be described in detail later, the gasket 78 is configured to be elastically deformable so as to allow the fluid in the pump chamber 50 to escape to the outside when the internal pressure of the pump chamber 50 exceeds a predetermined value. As shown in FIG. 1, the relief structure 70 is provided at a position radially outside the seal structures 42 and 44 for sealing the stator housing chamber 30.

  Further, a fixing structure 82 that fixes the motor case 12 and the case main body 16 of the pump case 14 so as to be displaceable in a separating direction is provided at a position radially outward from the relief structure 70. The configuration of the fixing structure 82 will be described in detail. A flange portion 84 is formed integrally with the case main body 16, and a hole portion 86 is formed through the flange portion 84 in the plate thickness direction.

  The bush 88 is formed of an elastic material such as rubber, and is configured to include an umbrella-shaped flange portion 92 integrally with a cylindrical boss portion 90. The boss portion 90 is inserted into a hole portion 86 formed in the flange portion 84 of the motor case 12, and a tip portion thereof is separated from the flange portion 80 formed in the pump case 14. As described above, when the boss 90 is inserted into the hole 86 formed in the flange 84 of the motor case 12, the flange 92 is brought into contact with the opening peripheral edge of the hole 86 of the flange 84. It is in a state.

  The collar 96 is made of, for example, a material such as hard plastic, and is configured to include an umbrella-shaped flange portion 100 integrally with a cylindrical boss portion 98, similarly to the bush 88. The boss portion 98 is inserted into a hole portion 86 formed in the flange portion 84 of the motor case 12 through a hole portion 94 formed in the bush 88, and a tip portion thereof is connected to a flange portion 80 formed in the pump case 14. It is in contact. The flange portion 100 is brought into contact with the flange portion 92 formed in the bush 88 when the boss portion 98 is inserted into the hole portion 94 formed in the bush 88 as described above.

  The screw 104 is inserted into the hole portion 102 of the collar 96, and the tip portion thereof is screwed into the screw hole 106 formed in the flange portion 80 of the pump case 14. At this time, the head portion 108 of the screw 104 presses the flange portion 92 of the bush 88 against the flange portion 84 of the motor case 12 via the flange portion 100 of the collar 96. Therefore, the entire motor case 12 can be displaced in a direction away from the pump case 14 (Z direction) by the elastic deformation of the flange portion 92 of the bush 88.

  Next, the effect of the pump apparatus 10 which concerns on one Embodiment of this invention is demonstrated.

In the pump device 10 according to the present embodiment, when the rotor 56 rotates due to the magnetic action of the stator 32 and the rotor 56, the impeller 66 rotates integrally with the rotor 56, and an opening is formed in the pump chamber 50 by the rotation of the impeller 66. The fluid is transferred from the fluid suction port 52 to the fluid discharge port 54. Here, in the pump device 10 according to the present embodiment, for example, when the fluid is an aqueous solution such as engine cooling water and the use atmosphere is equal to or lower than the freezing temperature of the aqueous solution, the aqueous solution in the pump chamber 50 is reduced. Some freeze and expand in volume.

  However, in the pump device 10 according to the present embodiment, as described above, the motor case 12 and the pump case 14 are fixed so as to be displaceable in the direction away from each other by the fixing structure 82. That is, the entire motor case 12 can be displaced in the direction away from the pump case 14 (Z direction) by the elastic deformation of the flange portion 92 of the bush 88.

Therefore, as described above, for example, even when the fluid is an aqueous solution and the usage atmosphere is below the freezing temperature of the aqueous solution, and a part of the aqueous solution in the pump chamber 50 freezes and expands in volume, the motor case 12 and the pump The case 14 is separated by the fixing structure 82, and the volume of the pump chamber 50 is increased. Thereby, it is possible to suppress an abnormal increase in the internal pressure of the pump chamber 50.

  When the aqueous solution in the pump chamber 50 is frozen and the volume of the frozen aqueous solution further expands, and the internal pressure of the pump chamber 50 exceeds a predetermined value, the relief structure 70 is activated. That is, the pressure of the fluid acts on the gasket 78 from the pump chamber 50 through the axial passage 72 and the radial passage 74, and when this pressure exceeds a predetermined value, the gasket 78 moves the fluid in the pump chamber 50. It is elastically deformed so as to actively escape to the outside. Therefore, when the internal pressure of the pump chamber 50 becomes a predetermined value or more, the fluid in the pump chamber 50 is automatically discharged to the outside due to the elastic deformation of the gasket 78.

  As described above, in the pump device 10 according to this embodiment, even when the aqueous solution in the pump chamber 50 is frozen and the volume of the frozen aqueous solution further expands, the aqueous solution in the pump chamber 50 escapes from the release structure 70. It is discharged to the outside, and an abnormal increase in the internal pressure of the pump chamber 50 is suppressed. As a result, even if a member capable of releasing pressure, such as a resin hose, is not connected to the pump device 10, damage to the pump device 10 as a whole, damage to a piping member connected to the pump device 10, etc. It becomes possible to prevent.

  Further, in the pump device 10 according to the present embodiment, the relief structure 70 for reducing the internal pressure of the pump chamber 50 described above is set to have a lower pressure resistance than the seal structures 42 and 44 provided in the stator housing chamber 30. Has been. Therefore, as described above, when the internal pressure of the pump chamber 50 rises, the relief structure 70 reaches the rated pressure before the seal structures 42 and 44 and discharges the fluid in the pump chamber 50 to the outside. This makes it possible to achieve both suppression of an abnormal increase in the internal pressure of the pump chamber 50 and securing of the sealing performance of the stator housing chamber 30 that houses the stator 32.

  Further, in the pump device 10 according to the present embodiment, the fluid suction port 52 is provided in the radially inner portion of the pump chamber 50, and the fluid discharge port 54 is provided in the radially outer portion of the pump chamber 50. Therefore, when the impeller 66 rotates, the pressure of the fluid is higher in the radially outer portion of the pump chamber 50 than in the radially inner portion.

  And in the pump apparatus 10 which concerns on this embodiment, the above-mentioned escape structure 70 is arrange | positioned in the radial direction outer side rather than the seal structures 42 and 44. FIG. Therefore, when the impeller 66 is rotated to convey the fluid from the fluid suction port 52 in the pump chamber 50 to the fluid discharge port 54, the fluid in contact with the relief structure 70 is more than the fluid in contact with the seal structures 42 and 44. Since the pressure is high, the relief structure 70 can reach the rated pressure before the seal structures 42 and 44. Accordingly, it is possible to reliably suppress the abnormal increase in the internal pressure of the pump chamber 50 while ensuring the sealing performance of the stator housing chamber 30 by the seal structures 42 and 44.

  In the pump device 10 according to the present embodiment, the fixing structure 82 for fixing the motor case 12 and the pump case 14 is more radially outward than the sealing structures 42 and 44 and the relief structure 70 described above. Has been placed. Therefore, it is possible to ensure a movable stroke in the direction in which the motor case 12 and the pump case 14 are separated from each other (Z direction). For example, even when the aqueous solution in the pump chamber 50 is frozen, the volume of the pump chamber 50 is further increased. Can do. Thereby, it becomes possible to more reliably suppress an abnormal increase in the internal pressure of the pump chamber 50.

  In the pump device 10 according to the present embodiment, the above-described gasket 78 is made of an elastic material. Therefore, as described above, when the fluid in the pump chamber 50 is discharged to the outside and the internal pressure of the pump chamber 50 decreases, the gasket 78 is restored to its original shape, and the sealing performance of the pump chamber 50 is automatically secured again. Is done.

  Further, in the pump device 10 according to the present embodiment, as described above, an abnormal increase in the internal pressure of the pump chamber 50 can be suppressed. It is not necessary to use metal parts for the outer periphery around the magnet 64), and resin parts can be used. Therefore, by using resin parts for the part that becomes the magnetic gap, it is possible to prevent iron loss from occurring in this part, and to improve the pump efficiency (motor efficiency).

  Furthermore, in the pump device 10 according to the present embodiment, as described above, the maximum value of the internal pressure of the pump chamber 50 can be kept low by suppressing the abnormal increase in the internal pressure of the pump chamber 50, and thus the pump device. The maximum stress applied to each of the ten components can also be reduced. For this reason, the strength of each component can be lowered. Therefore, each component does not need to be made of metal, and can be made of resin, so that the weight of the entire pump device 10 can be reduced. Further, the thickness of each part can be reduced without using a high-strength material for each component, and thus the material cost can be reduced.

  In the above embodiment, when the fluid in the pump chamber 50 is an aqueous solution such as engine cooling water and the internal pressure of the pump chamber 50 becomes a predetermined value or more due to volume expansion accompanying freezing of the aqueous solution, the pump chamber 50 Although it has been described that the fluid in 50 is released to the outside, the present invention is not limited to this. In other words, for example, the fluid in the pump chamber 50 is thermally expanded, so that the fluid in the pump chamber 50 is allowed to escape to the outside when the internal pressure of the pump chamber 50 exceeds a predetermined value. Of course it is good.

It is side surface sectional drawing which shows the whole structure of the pump apparatus which concerns on one Embodiment of this invention. It is a principal part expanded sectional view of the pump apparatus which concerns on one Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Pump apparatus, 12 ... Motor case, 14 ... Pump case, 16 ... Case main body, 18 ... Stator case, 20 ... Circuit case, 22 ... Recessed part, 24 ... Ring part, 26 ... Disk part, 28 ... Cylindrical part, DESCRIPTION OF SYMBOLS 30 ... Stator accommodation chamber, 32 ... Stator, 34 ... Laminated core, 36 ... Stator coil, 38, 40 ... O-ring, 42, 44 ... Seal structure, 46 ... Circuit accommodation chamber, 48 ... Circuit board, 50 ... Pump chamber, 52 ... Fluid suction port, 54 ... Fluid discharge port, 56 ... Rotor, 58 ... Bearing member, 60 ... Rotating shaft, 62 ... Supporting part, 64 ... Magnet, 66 ... Impeller, 68 ... Blade, 70 ... Relief structure, 72 ... Axial passage, 74 ... radial passage, 76 ... receiving groove, 78 ... gasket (seal member), 80, 84, 92, 100 ... flange, 82 ... fixing structure, 86, 94, 102 ... hole , 88 ... bush, 90, 98 ... boss part, 96 ... color, 104 ... screw, 106 ... screw hole, 108 ... head

Claims (4)

A motor housing including a stator housing chamber having a seal structure for a fluid in the pump chamber, and a stator housed in the stator housing chamber;
The pump case is formed with the motor case, and a pump case in which a rotor and an impeller are accommodated in the pump chamber;
The pressure resistance is set lower than that of the seal structure, and the fluid in the pump chamber is externally provided when the internal pressure of the pump chamber, which is provided between the motor case and the pump case, exceeds a predetermined value. Escape structure to escape,
A pump device comprising: The relief structure includes a seal member made of an elastic material,
2. The pump device according to claim 1 , wherein the seal member is configured to be elastically deformable so as to allow fluid in the pump chamber to escape to the outside when an internal pressure of the pump chamber reaches a predetermined value or more. . A motor housing including a stator housing chamber having a seal structure for a fluid in the pump chamber, and a stator housed in the stator housing chamber;
  The pump case is formed with the motor case, and a pump case in which a rotor and an impeller are accommodated in the pump chamber;
  A relief structure that is provided between the motor case and the pump case and allows the fluid in the pump chamber to escape to the outside when the internal pressure of the pump chamber becomes a predetermined value or more;
  A fixing structure for fixing the motor case and the pump case so as to be displaceable in a separating direction;
  A pump device comprising: The pump chamber includes a fluid suction port at a radially inner portion and a fluid discharge port at a radially outer portion,
The pump device according to claim 3 , wherein the seal structure, the relief structure, and the fixing structure are formed in order from the radially inner side to the outer side .

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