JP2010024835A - Hydraulically driving type motor, hydraulically driving type fan, and chiller of exothermic body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a small liquid drive type motor (liquid drive type fan) with low operation noise not generating electromagnetic waves. <P>SOLUTION: A liquid channel 11 and a pump chamber 12 connected to the channel 11 are formed in a body. A drive shaft 20 is rotatably supported by a body 10, an impeller 50 and a propeller 60 are fixed on the drive shaft 20 in such a manner that the same can rotate as one unit. The impeller 50 receives movement of liquid in the channel 11 and rotates. A piezoelectric/electrostrictive element 70 is fixed on an outer surface of a part 15 of an outer wall of the body 10 constructing the pump chamber 12. Liquid in the pump chamber 12 is pressure-fed toward the channel 11 by changing volume of the pump chamber 12 by deformation of the part 15 of the outer wall by drive of the piezoelectric/electrostrictive element 70. Consequently, the liquid drive type motor (fan) converting motion of pressure-fed liquid to rotary motion of the impeller 50 and driving and rotating the drive shaft 20 (propeller 60) is provided. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a motor (liquid drive motor) that drives a rotating shaft using the motion of liquid, a liquid drive fan using a liquid drive motor, and a cooling device for a heating element using a liquid drive fan. In particular, the present invention relates to an actuator in which a piezoelectric / electrostrictive element is used as an actuator for driving a liquid.

Patent Document 1 discloses a hydraulic motor-driven pump. In this pump, the motor impeller rotates using the flow of pressure water discharged by the rotational drive of a separate pressure feed water pump. When the motor impeller rotates, the rotation shaft integral with the motor impeller rotates, and as a result, the pump impeller integral with the rotation shaft rotates. The pump action is achieved by utilizing the rotation of the pump impeller. By this pump action, for example, water from a well can be pumped into a pressure tank or the like.
JP 2000-120575 A

  As described above, in the hydraulic motor-driven pump described in the above document, a pressure feed water pump is used as an actuator for driving liquid. By rotating the pressure water supply pump, the rotation shaft can be driven using the movement of the liquid. In other words, the hydraulic motor-driven pump can also function as a motor (that is, a liquid-driven motor) that drives the rotating shaft using the motion of the liquid.

  By the way, normally, the pressure feed water pump is rotationally driven using a DC brush motor or the like. Therefore, when a pressure feed water pump is used as an actuator for driving a liquid, electromagnetic waves are generated, and there is a problem that the operating noise is large due to the sliding of the brush. Further, when a pressure water supply pump is used as an actuator for driving liquid, there may be a problem that it is difficult to meet the demand for downsizing of a liquid drive motor. From the above, it is desired to provide a small liquid drive motor that does not generate electromagnetic waves, has a low operating noise, and is small.

  A liquid drive motor according to the present invention includes a main body having a liquid flow path therein, a drive shaft rotatably supported by the main body, and fixed to the drive shaft so as to rotate integrally with the drive shaft. An impeller that rotates in response to the movement of the liquid in the flow path, and a pump unit that pumps the liquid in the pump chamber connected to the flow path toward the flow path. The liquid drive motor converts the movement of the pumped liquid into a rotational movement of the impeller by the action of a pump unit, and rotationally drives the drive shaft.

  The liquid drive motor according to the present invention is characterized in that the pump unit is a piezoelectric / electrostrictive element fixed to a surface of a part of a wall constituting the pump chamber, and a drive for driving the piezoelectric / electrostrictive element. And the liquid in the pump chamber is pumped to the flow path by changing the volume of the pump chamber by deformation of a part of the wall by driving the piezoelectric / electrostrictive element. It is in. The pump chamber may be provided separately from the main body, but in order to reduce the size of the entire liquid drive motor, it is preferable that the pump chamber is disposed inside the main body. is there.

  Thus, in the present invention, a piezoelectric / electrostrictive element is used as an actuator for driving a liquid. When the piezoelectric / electrostrictive element is driven, no electromagnetic wave is generated. In addition, the operating noise is extremely small compared to a DC brush motor or the like. In addition, since the piezoelectric / electrostrictive element itself can be easily downsized, the liquid driven motor as a whole can be easily downsized. As described above, according to the above configuration, it is possible to provide a small-sized liquid drive motor that does not generate electromagnetic waves and that has a low operating noise.

  In the liquid drive motor according to the present invention, the pump unit includes one or a plurality of the piezoelectric / electrostrictive elements for each of the plurality of pump chambers, and each of the plurality of pump chambers includes It is preferable that the driving means connected to the flow path is configured to drive all of the plurality of piezoelectric / electrostrictive elements.

  According to this, each liquid pumped from each pump chamber by driving each piezoelectric / electrostrictive element joins and is led to the flow path to be used for rotational driving of the impeller. Thereby, compared with the case where there is one pump chamber, the flow rate (and hence the flow rate) of the liquid supplied into the flow path can be increased and the rotation speed of the impeller can be increased. As a result, a larger motor output can be obtained.

  In the liquid drive motor according to the present invention, when the propeller is disposed outside the main body so as to rotate integrally with the drive shaft, the liquid drive fan according to the present invention can be provided. This liquid-driven fan can function as a blower, for example.

  In the liquid drive type fan according to the present invention, all the portions of the drive shaft are disposed inside the main body, and the first permanent magnet fixed to the drive shaft so as to rotate integrally with the drive shaft; And a second permanent magnet disposed around the first permanent magnet outside the main body and rotating coaxially with the drive shaft as the first permanent magnet rotates, wherein the propeller is the second permanent magnet. It is preferable that the second permanent magnet is fixed so as to rotate integrally with the magnet.

  According to this, all the drive shafts are disposed inside the main body. In other words, one end of the drive shaft does not protrude from the outer wall of the main body. Accordingly, since there is no sliding portion between the outer wall of the main body and the drive shaft, a sealing mechanism for preventing leakage of liquid from the inside of the main body to the outside of the main body via the sliding portion becomes unnecessary. That is, according to the above configuration, the propeller can be disposed outside the main body so as to rotate integrally with the drive shaft while preventing leakage of the liquid without employing the sealing mechanism.

  In the liquid drive fan according to the present invention, an exhaust port is formed in a portion facing the propeller on the outer surface of the main body, and an intake port is formed in a portion not facing the propeller. In this case, a form in which a communication path that connects the intake port and the exhaust port is formed may be employed.

  According to this, when the rotation direction of the propeller is controlled so that the wind (airflow) by the propeller is formed in a direction away from the outer surface of the main body, the main body can be disposed even in the vicinity of the exhaust port formed in the portion facing the propeller. An air flow is formed in a direction away from the outer surface of the gas (that is, a direction in which air is discharged from the exhaust port). Due to the formation of this air flow, air is sucked from the intake port in the vicinity of the intake port communicating with the exhaust port via the communication path. That is, it is possible to suck air from the intake port and exhaust the air from the exhaust port. Therefore, in this configuration, for example, a liquid-driven fan of this form is sucked into the housing inside a part of an outer wall of a housing (for example, a main body of a personal computer) including a heating element (for example, CPU). By disposing air tightly so that the mouth is exposed and the exhaust port is exposed outside the housing, the heat inside the housing can be discharged to the outside (air cooling function).

  Further, in the liquid drive fan according to the present invention, a metal plate fixed to the outer surface of the main body, and a metal plate for cooling a heating element that contacts the outer surface of the metal plate, When the metal plate is arranged so that the inner surface of the metal plate faces the intake port and can take in outside air from the intake port, the metal plate can function as a cooler for a heating element.

  In other words, when the heat generating body cooler having the above structure is used in a state where the heat generating element is in contact with the outer surface of the metal plate, the air cooling function is exhibited and heat is generated through the metal plate having a low thermal conductivity. Heat exchange can be performed between the body and the main body (including liquid inside) (liquid cooling function). Therefore, the heating element can be effectively cooled by the air cooling function and the liquid cooling function.

  Hereinafter, embodiments of a liquid drive motor (liquid drive fan) according to the present invention will be described with reference to the drawings.

(First embodiment)
A liquid-driven fan according to a first embodiment of the present invention will be described with reference to FIGS. 1A is a top view (plan view), FIG. 1B is a front view, FIG. 1C is a bottom view, and FIG. 2 is 2-2 in FIG. 3 is a cross-sectional view of the liquid-driven fan cut along a plane along the line, and FIG. 3 is a cross-sectional view of the liquid-driven fan cut along the plane 3-3 in FIG. 4 is a cross-sectional view of the liquid-driven fan cut along a plane along line 4-4 in FIG. 1 (b), and FIG. 5 is along line 5-5 in FIG. 1 (b). FIG. 6 is a cross-sectional view of the liquid drive fan cut along a plane, and FIG. 6 is a cross-sectional view of the liquid drive fan cut along a plane along line 6-6 in FIG.

  As can be understood from FIGS. 1 to 6, the first embodiment includes a rectangular parallelepiped (cubic) main body 10. A flow path 11, a pump chamber 12, and a tank 13 are formed inside the main body 10, and a liquid (for example, water) is pressurized and sealed therein. The reason why the liquid is sealed under pressure is to suppress the generation of bubbles in the liquid.

  The flow path 11 is connected to the discharge port 12a and the suction port 12b of the pump chamber 12, respectively. The liquid pumped from the pump chamber 12 through the discharge port 12a goes around the flow path 11 (single loop), and then flows back to the pump chamber 12 through the suction port 12b (particularly, FIG. 3). In addition, the tank 13 is connected to the flow path 11 in the vicinity of the suction port 12b, and stores a part of the liquid toward the suction port 12b.

  The drive shaft 20 is disposed on the main body 10 such that one end is exposed to the outside of the main body and the other end is located inside the main body (see particularly FIG. 2). The drive shaft 20 is supported so as to be immovable and rotatable in the axial direction by a support hole 14 formed in the outer wall of the main body 10 and a bearing 30 fixed inside the main body 10. An O-ring 40 is interposed between the support hole 14 and the drive shaft 20. This prevents the liquid from leaking from the flow path 11 to the outside of the main body 10 through the gap between the support hole 30 and the drive shaft 20.

  An impeller 50 is integrally fixed to the other end of the drive shaft 20 inside the main body (see particularly FIG. 2). The impeller 50 is disposed so as to rotate integrally with the drive shaft 20. A part of the impeller 50 is exposed to a part of the flow path 11 (see particularly FIG. 4). Thereby, the impeller 50 is rotated by receiving the movement of the liquid in the flow path 11. In this example, the impeller 50 is of a type that matches the inflow / outflow direction of the liquid.

  A propeller 60 is integrally fixed to one end side of the drive shaft 20 outside the main body (see particularly FIG. 2). The propeller 60 is disposed so as to be rotatable together with the drive shaft 20. Thus, when the impeller 50 rotates, the propeller 60 rotates via the drive shaft 20.

  A part of the outer wall of the main body 10 also serves as a wall constituting (partitioning) the pump chamber 12. This portion of the outer wall of the main body 10 is thinner than the other portions and is easily deformed. Hereinafter, this portion is referred to as “drive plate portion 15”.

  A thin plate-like piezoelectric / electrostrictive element 70 is fixed to the outer surface of the drive plate portion 15. The piezoelectric / electrostrictive element 70 is driven by the ECU 80. When the piezoelectric / electrostrictive element 70 is driven, the piezoelectric / electrostrictive element 70 expands and contracts in a predetermined direction parallel to its own plane. Along with this, the drive plate portion 15 (particularly, the central portion thereof) is deformed in a direction perpendicular to its own plane. Due to this deformation, the volume of the pump chamber 12 changes.

  Here, the opening area of the discharge port 12a of the pump chamber 12 is formed larger than the opening area of the suction port 12b. As a result, when the volume of the pump chamber 12 changes as described above, the liquid in the pump chamber 12 is pumped from the discharge port 12a toward the flow path 11, and accordingly, the liquid is discharged from the suction port 12b. Is returned to the pump chamber 12. As described above, the piezoelectric / electrostrictive element 70, the ECU 80, the diaphragm portion 15, and the pump chamber 12 (the discharge port 12a and the suction port 12b) constitute a “pump unit”.

  As described above, in the first embodiment, when the piezoelectric / electrostrictive element 70 is driven by the ECU 80, the liquid is pumped from the pump chamber 12 toward the flow path 11, and a liquid flow is formed in the flow path 11. Is done. The impeller 50 rotates in response to the movement of the liquid. When the impeller 50 rotates, the drive shaft 20 rotates. From this viewpoint, the above-described embodiment functions as a motor. In addition, the propeller 60 rotates as the drive shaft 20 rotates. As a result, wind is formed. In this viewpoint, the above embodiment can function as a fan (blower).

  As described above, in the first embodiment, the piezoelectric / electrostrictive element 70 is used as an actuator for driving the liquid. The piezoelectric / electrostrictive element 70 does not generate electromagnetic waves due to driving. In addition, the operating noise is extremely small compared to a DC brush motor or the like. In addition, since the piezoelectric / electrostrictive element 70 itself can be easily downsized, the liquid driven motor as a whole can be easily downsized. That is, according to the first embodiment, it is possible to provide a small-sized liquid drive motor (liquid drive fan) that does not generate electromagnetic waves and that has a low operating noise.

  The present invention is not limited to the first embodiment, and various modifications can be employed within the scope of the present invention. For example, in the first embodiment, one pump chamber 12 and one piezoelectric / electrostrictive element 70 are provided for one pump chamber 12, but two for one pump chamber 12. The above piezoelectric / electrostrictive element 70 may be provided. Further, part or all of the wall of the pump chamber 12 may be formed of the piezoelectric / electrostrictive element 70.

  Also, as shown in FIG. 7 corresponding to FIG. 1 and FIG. 8 corresponding to FIG. 6, two pump chambers 12 are provided, and one piezoelectric / electrostrictive element 70 is provided for each of the two pump chambers 12. May be provided. Alternatively, one or more piezoelectric / electrostrictive elements 70 may be provided for each of the three or more pump chambers 12. In the following drawings, members that are the same as or equivalent to the members shown in the previous drawings are given the same reference numerals as those in the previous drawings, and the description thereof is substituted.

  In this case, as shown in FIG. 8, the communication path 11 a is formed so that all the liquids discharged from the respective pumps 12 (discharge ports 12 a) merge with the flow path 11. All the piezoelectric / electrostrictive elements 70 are driven by the ECU 80. Accordingly, the liquids pumped from the pump chambers 12 by driving the piezoelectric / electrostrictive elements 70 merge and are guided to the flow path 11 to be used for rotationally driving the impeller 50.

  As a result, the flow rate (and hence the flow rate) of the liquid supplied into the flow path 11 is increased and the rotational speed of the impeller 50 is increased as compared with the case where there is one pump chamber 12 (of the same size). it can. As a result, a larger motor output can be obtained.

  In the first embodiment, the propeller 60 is integrally fixed with the drive shaft 20 outside the main body. However, the propeller 60 is integrated with the drive shaft 20 using the configuration shown in FIG. 9 corresponding to FIG. You may arrange | position so that it may rotate.

  That is, in the configuration shown in FIG. 9, the bottomed cylindrical lid 16 (which constitutes a part of the main body 10) has a liquid-tight exterior to the support hole 14 in the vicinity of the support hole 14 on the outer wall of the main body 10. It is fixed in one piece so as to close from. In addition, all portions of the drive shaft 20 are disposed inside the main body 10.

  A cylindrical first permanent magnet 90 is coaxially and integrally fixed to one end of the drive shaft 20 so as to rotate integrally with the drive shaft 20. A member 110 having a bottomed cylindrical portion 110 a and a shaft portion 110 b covers the outer periphery of the lid body 16 (ie, outside the main body 10) so as to cover the lid body 16 and be coaxially rotatable relative to the lid body 16. It is mated. A cylindrical second permanent magnet 120 is coaxially and integrally fixed to the tip of the bottomed cylindrical portion 110a. A propeller 60 is coaxially and integrally fixed to the tip of the shaft portion 110b.

  With the above configuration, when the drive shaft 20 rotates due to the rotation of the impeller 50, the first permanent magnet 90 rotates coaxially with the drive shaft 20. When the first permanent magnet 90 rotates, the second permanent magnet 120 also rotates coaxially with the drive shaft 20 following the rotation of the first permanent magnet 90 due to the magnetic action of the first and second permanent magnets 90, 120. To do. When the second permanent magnet 120 rotates, the propeller 60 rotates coaxially with the drive shaft 20 via the member 110. In this way, the propeller 60 rotates integrally with the drive shaft 20.

  In the configuration shown in FIG. 9, as described above, all of the drive shaft 20 is disposed inside the main body. In other words, one end of the drive shaft 20 does not protrude from the outer wall of the main body 10. Accordingly, since there is no sliding portion between the outer wall of the main body 10 and the drive shaft 20, a sealing mechanism for preventing leakage of liquid from the inside of the main body to the outside of the main body via the sliding portion becomes unnecessary. That is, it is not necessary to provide the O-ring 40 (seal mechanism) in the support hole 14 as in the first embodiment (see FIG. 2). Therefore, the O-ring 40 is omitted in the configuration shown in FIG. As described above, in the configuration shown in FIG. 9, the propeller 60 can be disposed outside the main body so as to rotate integrally with the drive shaft 20 while preventing leakage of liquid without using a sealing mechanism.

  When the driving of the piezoelectric / electrostrictive element 70 is stopped, a rotation transmission system between the drive shaft 20 and the propeller 60 is used in order to avoid the rotation braking torque being applied to the propeller 60 as the drive shaft 20 is decelerated. A one-way clutch may be interposed in the middle.

(Second Embodiment)
Next, a liquid drive fan according to a second embodiment of the present invention will be described with reference to FIGS. 10 (a) is a top view (plan view), FIG. 10 (b) is a front view, FIG. 10 (c) is a bottom view, and FIG. 11 is 11-11 in FIG. 10 (a). FIG. 12 is a cross-sectional view of the liquid-driven fan cut along a plane along the line, and FIG. 12 is a cross-sectional view of the liquid-driven fan cut along the plane along line 12-12 in FIG. .

  As can be understood from FIGS. 10 to 12, the second embodiment is different from the first embodiment in that two pump chambers 12 (and piezoelectric / electrostrictive elements 70) are provided. The type in which the outflow direction of the liquid is perpendicular to the inflow direction of the liquid is adopted, the configuration of the flow path 11 is changed accordingly (double loop), and the main body 10 is penetrated. The difference is that the holes 17 are formed. Therefore, also in the second embodiment, at least the same actions and effects as the first embodiment are exhibited. In the second embodiment, the tank 13 is omitted, but it goes without saying that the tank 13 may be provided.

  Two through-holes 17 are formed in parallel with the drive shaft 20 (see in particular FIG. 12). One end (exhaust ports 17 a, 17 a) of the through holes 17, 17 is formed at a position facing the propeller 60. Therefore, when the rotation direction of the propeller 60 is controlled so that the wind (airflow) by the propeller 60 is formed in a direction away from the outer surface of the main body 10 (upward in FIG. 12), even in the vicinity of the exhaust ports 17a and 17a, An air flow is formed in a direction away from the outer surface of the main body 10 (that is, a direction in which air is discharged from the exhaust ports 17a and 17a). Due to the formation of this air flow, air is sucked from the intake ports 17b and 17b in the vicinity of the other ends (intake ports 17b and 17b) of the through holes 17 and 17 communicating with the exhaust ports 17a and 17a via the through holes 17 and 17. The That is, it is possible to suck air from the intake ports 17b and 17b and exhaust the air from the exhaust ports 17a and 17a.

  Therefore, as shown in FIG. 13, the second embodiment is configured such that a part of the outer wall of a casing (for example, a main body of a personal computer) including a heating element (for example, a CPU) is provided inside the casing. By disposing air tightly so that 17b and 17b are exposed and exhaust ports 17a and 17a are exposed to the outside of the housing, heat inside the housing can be discharged to the outside. Hereinafter, such a cooling function of the heating element is referred to as an “air cooling function”. That is, the liquid-driven fan according to the second embodiment can also function as a cooler for a heating element using an air cooling function.

  Furthermore, as shown in FIG. 14, the second embodiment can be modified. FIGS. 14A and 14B correspond to FIGS. 10B and 10C, respectively. 14 (a) and 14 (b), a rectangular groove 18 having a rectangular cross section is formed on the lower surface (bottom surface) of the rectangular parallelepiped body 10 so as to relate to the through holes 17 and 17. Yes. Air inlets 17b and 17b are formed at the intersections between the bottom surface of the groove 18 and the through holes 17 and 17, respectively.

  The form shown in FIG. 14 is used, for example, with a metal plate 130 fixed to the lower surface of the main body 10 as shown in FIG. When the metal plate 130 is fixed in this manner, the inner surface of the metal plate 130 faces the intake ports 17b and 17b. In addition, since both ends of the groove 18 are open, outside air can be taken in from the intake ports 17b and 17b via the groove 18.

  Then, when this cooler is operated in a state where a heating element such as a CPU is in contact with the outer surface of the metal plate 130, the heat of the heating element (CPU) is transmitted to the metal plate 130. Thereby, the metal plate 130 is warmed. When the metal plate 130 is warmed, the air existing near the inner surface of the metal plate 130 is also warmed. The air thus warmed is exhausted from the exhaust ports 17a and 17a through the through holes 17 and 17. That is, the air cooling function is exhibited.

  In addition, the heat transmitted from the heating element (CPU) to the metal plate 130 is transmitted to the liquid inside the main body through the outer wall of the main body 10 that contacts the metal plate 130. The heat transferred to the liquid is released to the outside of the main body through other portions of the outer wall of the main body 10 that are not in contact with the metal plate 130. Also by this, the heat of the heating element (CPU) can be discharged to the outside. Such a cooling function of the heating element is called a “liquid cooling function”.

  As described above, as shown in FIG. 15, the air cooling function and the liquid cooling function are exhibited by using the form shown in FIG. 14 in contact with a heating element such as a CPU via the metal plate 130. It is possible to cool the heating element (CPU) effectively.

  As the material of the metal plate 130, a material having a high thermal conductivity is preferably employed in order to increase the heat transfer efficiency from the heating element (CPU).

1A, 1B, and 1C are a top view, a front view, and a bottom view, respectively, of a liquid drive motor (liquid drive fan) according to a first embodiment of the present invention. It is sectional drawing which cut | disconnected the liquid drive type fan in the plane along the 2-2 line of Fig.1 (a). It is sectional drawing which cut | disconnected the liquid drive type fan in the plane along the 3-3 line of Fig.1 (a). It is sectional drawing which cut | disconnected the liquid drive type fan in the plane in alignment with line 4-4 of FIG.1 (b). It is sectional drawing which cut | disconnected the liquid drive type fan in the plane along line 5-5 of FIG.1 (b). It is sectional drawing which cut | disconnected the liquid drive type fan in the plane along 6-6 line of Fig.1 (a). It is a figure corresponding to FIG. 1 about the liquid drive motor (liquid drive fan) which concerns on the modification of 1st Embodiment of this invention. FIG. 8 is a view corresponding to FIG. 6 for a liquid drive motor (liquid drive fan) according to the modification shown in FIG. 7. It is a figure corresponding to FIG. 2 about the liquid drive motor (liquid drive fan) which concerns on the other modification of 1st Embodiment of this invention. FIGS. 10A, 10B, and 10C are a top view, a front view, and a bottom view, respectively, of a liquid drive motor (liquid drive fan) according to a second embodiment of the present invention. It is sectional drawing which cut | disconnected the liquid drive type fan in the plane along the 11-11 line | wire of Fig.10 (a). It is sectional drawing which cut | disconnected the liquid drive type fan in the plane in alignment with line 12-12 of Fig.10 (a). It is the figure which showed an example of the usage type of the liquid drive motor (liquid drive fan) which concerns on 2nd Embodiment of this invention. FIGS. 14A and 14B are views corresponding to FIGS. 10B and 10C, respectively, for a liquid drive motor (liquid drive fan) according to a modification of the second embodiment of the present invention. It is the figure which showed an example of the usage pattern in the case of using it as a cooler of a heat generating body in the state contacted with the heat generating body via the metal plate 130 in the modification shown in FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Main body, 11 ... Flow path, 11a ... Communication path, 12 ... Pump chamber, 15 ... Drive plate part, 17 ... Through-hole, 17a ... Exhaust port, 17b ... Intake port, 20 ... Drive shaft, 50 ... Impeller, 60 ... propeller, 70 ... piezoelectric / electrostrictive element, 80 ... CPU, 90 ... first permanent magnet, 120 ... second permanent magnet, 130 ... metal plate

Claims (7)

A body having a liquid flow path therein;
A drive shaft rotatably supported by the body;
An impeller which is fixed to the drive shaft so as to rotate integrally with the drive shaft and rotates by receiving the movement of the liquid in the flow path;
A pump unit that pumps the liquid in the pump chamber connected to the flow path toward the flow path;
A liquid drive motor that converts the motion of the pumped liquid into a rotational motion of the impeller and rotationally drives the drive shaft;
The pump part is
A piezoelectric / electrostrictive element fixed to a surface of a part of a wall constituting the pump chamber;
Driving means for driving the piezoelectric / electrostrictive element;
And a liquid drive motor configured to pump the liquid in the pump chamber by changing the volume of the pump chamber by deformation of a part of the wall by driving the piezoelectric / electrostrictive element. The liquid drive motor according to claim 1,
The pump part is
One or more piezoelectric / electrostrictive elements are provided for each of the plurality of pump chambers,
Each of the plurality of pump chambers is connected to the flow path,
The drive means is a liquid drive motor configured to drive all of the plurality of piezoelectric / electrostrictive elements. In the liquid drive type motor according to claim 1 or 2,
A liquid drive motor in which the pump chamber is disposed inside the main body. A liquid drive motor according to any one of claims 1 to 3,
A propeller arranged to rotate integrally with the drive shaft outside the body;
Liquid-driven fan with The liquid-driven fan according to claim 4.
All parts of the drive shaft are disposed inside the main body,
A first permanent magnet fixed to the drive shaft so as to rotate integrally with the drive shaft;
A second permanent magnet that is disposed around the first permanent magnet outside the main body and rotates coaxially with the drive shaft as the first permanent magnet rotates.
With
A liquid-driven fan fixed to the second permanent magnet such that the propeller rotates integrally with the second permanent magnet. The liquid-driven fan according to claim 4 or 5,
On the outer surface of the main body, an exhaust port is formed in a portion facing the propeller, and an intake port is formed in a portion not facing the propeller.
A liquid-driven fan in which a communication path that communicates the intake port and the exhaust port is formed inside the main body. A liquid-driven fan according to claim 6;
A metal plate fixed to the outer surface of the main body, and a metal plate for cooling the heating element in contact with the outer surface of the metal plate;
With
A cooling device for a heating element, wherein the metal plate is arranged so that an inner surface of the metal plate faces the intake port and is capable of taking outside air from the intake port.

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