WO2018235143A1

WO2018235143A1 - Refrigerant circulation device for motor

Info

Publication number: WO2018235143A1
Application number: PCT/JP2017/022577
Authority: WO
Inventors: 智之真鍋
Original assignee: 日産自動車株式会社
Priority date: 2017-06-19
Filing date: 2017-06-19
Publication date: 2018-12-27
Also published as: JP6726360B2; JPWO2018235143A1

Abstract

This refrigerant circulation device 1 for a motor cools the motor 7 by circulating a refrigerant in the motor 7, the refrigerant circulation device 1 comprising: a mechanical pump 2 connected mechanically to the motor 7 and configured so that the direction of discharge of the refrigerant is switched depending on the direction of rotation of the motor 7; and a passage switching mechanism 3 having connected thereto a supply passage 56 for supplying the refrigerant to the motor 7, the passage switching mechanism 3 also having connected thereto an introduction passage 57 into which the refrigerant discharged from the motor 7 is introduced, the passage switching mechanism 3 further having connected thereto a discharge passage 21 through which the refrigerant discharged from the mechanical pump 2 when the motor 7 is rotated in the forward direction flows, the passage switching mechanism 3 still further having connected thereto a suction passage 22 through which the refrigerant sucked in by the mechanical pump 2 when the motor 7 is rotated in the forward direction flows, the passage switching mechanism 3 being configured so that, when the motor 7 is rotated in the forward direction, the passage switching mechanism 3 connects the discharge passage 21 and the supply passage 56 and also connects the suction passage 22 and the introduction passage 57, and so that, when the motor 7 is rotated in the reverse direction, the passage switching mechanism 3 connects the suction passage 22 and the supply passage 56 and also connects the discharge passage 21 and the introduction passage 57.

Description

Motor coolant circulation system

The present invention relates to a refrigerant circulating apparatus for a motor.

In Japanese Patent No. 3211315, in a motor of an electric vehicle, in order to prevent the coil from generating heat and burning at high output, oil is forcibly circulated by an oil pump disposed in the wheel motor, A mechanism for cooling the inner coil is disclosed.

However, since the electric oil pump is expensive, mounting the oil pump increases the cost of the electric vehicle.

Then, an object of this invention is to provide the refrigerant | coolant circulation apparatus for motors which can circulate a refrigerant | coolant to a motor, without using an electrically-driven oil pump.

The motor refrigerant circulating apparatus according to one aspect of the present invention is a motor refrigerant circulating apparatus that causes a motor to circulate and cool a refrigerant. This device is mechanically connected to a motor, and has a mechanical pump that switches the discharge direction of the refrigerant according to the rotation direction of the motor, a supply path for supplying the refrigerant to the motor, and an introduction path for introducing the refrigerant discharged from the motor A discharge path for circulating the refrigerant discharged from the mechanical pump at the time of forward rotation of the motor and a suction path for circulating the refrigerant to be sucked by the mechanical pump at the time of forward rotation of the motor are connected. A path switching mechanism is provided, which connects the path and the supply path and communicates the suction path and the introduction path, and communicates the suction path and the supply path when the motor rotates in the reverse direction and connects the discharge path and the introduction path.

FIG. 1 is a schematic view of a motor refrigerant circulation device (during normal rotation) according to the first embodiment. FIG. 2 is a schematic view of the motor refrigerant circulation system (at the time of reverse rotation) according to the first embodiment. FIG. 3 is a schematic view of a path switching mechanism (in forward rotation) which constitutes the motor refrigerant circulation system of the first embodiment. FIG. 4 is a schematic view of a path switching mechanism (during reverse rotation) constituting the motor refrigerant circulation system of the first embodiment. FIG. 5 is a schematic view of a motor refrigerant circulation device (during normal rotation) according to the second embodiment. FIG. 6 is a schematic view of a motor coolant circulation system (during reverse rotation) according to the second embodiment. FIG. 7 is a schematic view of a path switching mechanism (during normal rotation) constituting the motor refrigerant circulation system of the second embodiment. FIG. 8 is a schematic view of a path switching mechanism (during reverse rotation) constituting the motor refrigerant circulation system of the second embodiment. FIG. 9 is a schematic view of a motor refrigerant circulation device (in normal rotation idle) according to the second embodiment. FIG. 10 is a schematic view of a motor refrigerant circulation device (in reverse rotation idle rotation) of the second embodiment. FIG. 11 is a schematic view of a path switching mechanism constituting the motor refrigerant circulating apparatus according to the second embodiment, wherein the solid line arrow indicates the flow direction of air when the mechanical pump is forward rotating, and the broken line arrow indicates the machine Shows the air flow direction at the time of reverse rotation. FIG. 12 is a schematic view of a motor coolant circulation system (in normal rotation idle) according to the third embodiment. FIG. 13 is a schematic view of a motor refrigerant circulation system (in reverse rotation idle rotation) of the third embodiment. FIG. 14 is a schematic view of a path switching mechanism (in forward rotation around the air) constituting the motor refrigerant circulation system of the fourth embodiment. FIG. 15 is a schematic view of a path switching mechanism (during reverse rotation around the air) that constitutes the motor refrigerant circulation system of the fourth embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Configuration of First Embodiment
FIG. 1 is a schematic view of a motor refrigerant circulation device 1 (during normal rotation) according to the first embodiment. FIG. 2 is a schematic view of the motor refrigerant circulation device 1 (during reverse rotation) according to the first embodiment.

The motor refrigerant circulation device 1 according to the first embodiment serves as a circulation path of a refrigerant such as oil for cooling the motor 7 (the rotor 72). The motor refrigerant circulating apparatus 1 is constituted by a mechanical pump 2 mechanically connected to a shaft 721 of a rotor 72 and a path switching mechanism 3. The motor 7 (housing 71) and the path switching mechanism 3 are connected by the supply path 56 and the introduction path 57 of the refrigerant.

The motor 7 has a housing 71 housing a rotor 72 (and a stator), and a refrigerant can circulate in the rotor 72. In the motor 7, the refrigerant supplied from the path switching mechanism 3 via the supply path 56 is supplied to the inside of the rotor 72, and the refrigerant discharged from the rotor 72 is stored in the tank 711 in the lower part of the housing 71. Then, the refrigerant stored in the tank 711 is introduced into the path switching mechanism 3 via the introduction path 57.

The mechanical pump 2 is directly connected to the shaft 721 of the rotor 72 or mechanically connected to the shaft 721 via a gear (not shown), and rotates according to the rotational force of the rotor 72, and follows the rotational direction of the rotor 72. The direction of rotation is switched. As the mechanical pump 2, a trochoid pump, a vane pump or the like can be applied. Then, the refrigerant discharged from the mechanical pump 2 is supplied to the motor 7 (the rotor 72) through the supply path 56, and the refrigerant stored in the tank 711 is introduced into the introduction path 57 by the suction force of the mechanical pump 2. Be done.

The mechanical pump 2 and the path switching mechanism 3 are connected via the discharge path 21 and the suction path 22. The discharge path 21 is a path through which the refrigerant discharged from the mechanical pump 2 flows when the mechanical pump 2 rotates forward, and the suction path 22 is the refrigerant drawn by the mechanical pump 2 when the mechanical pump 2 rotates forward. Is a route through which On the other hand, at the time of reverse rotation of the mechanical pump 2, the discharge path 21 is a path through which the refrigerant sucked by the mechanical pump 2 flows, and the suction path 22 is a path through which the refrigerant discharged by the mechanical pump 2 flows.

The path switching mechanism 3 includes a cylinder 4, a piston 5, and an actuator 6. The cylinder 4 is composed of a first cylinder 41 and a second cylinder 42. The first cylinder 41 and the second cylinder 42 are adjacent to each other, and the longitudinal direction and the direction of the opening match. Further, the first cylinder 41 and the second cylinder 42 are not in direct communication with each other, but are in communication with each other via the mechanical pump 2, the supply path 56, and the introduction path 57.

The supply path 56 branches into a first supply path 561 and a second supply path 562, the first supply path 561 is connected to the first cylinder 41, and the second supply path 562 is connected to the second cylinder 42.

The introduction path 57 branches into a first introduction path 571, a second introduction path 572, and a third introduction path 573. The first introduction path 571 is connected to the first cylinder 41, and the second introduction path 572 and the third introduction path 573 is connected to the second cylinder 42. The discharge path 21 is connected to the first cylinder 41, and the suction path 22 is connected to the second cylinder 42.

The piston 5 is supported by the actuator 6 and is movable in the cylinder 4 according to the drive of the actuator 6. The piston 5 is branched into a first piston 51 and a second piston 52 from an intermediate position in the longitudinal direction.
The first piston 51 and the second piston 52 are disposed parallel to each other, the first piston 51 is accommodated in the first cylinder 41, and the second piston 52 is accommodated in the second cylinder 42. Further, the second piston 52 is designed to be longer than the first piston 51.

A first partition plate 511 and a second partition plate 512 are attached to the first piston 51 in order of proximity to the actuator 6, and the second partition plate 512 is attached to the end of the first piston 51 in the longitudinal direction There is.

The fifth partition plate 523, the third partition plate 521, and the fourth partition plate 522 are attached to the second piston 52 in order of proximity to the actuator 6, and the fourth partition plate 522 is an end of the second piston 52 in the longitudinal direction Is attached to

In the first piston 51, a first internal space 411 is formed between the first partition plate 511 and the second partition plate 512, and on the opposite side of the first internal space 411 of the second partition plate 512, a second internal space 412 are formed.

In the second piston 52, a buffer space 423 is formed between the fifth partition plate 523 and the third partition plate 521, and a third internal space 421 is formed between the third partition plate 521 and the fourth partition plate 522. A buffer space 424 is formed on the opposite side of the third inner space 421 of the fourth partition plate 522. The buffer space 423 is an internal space communicated with the second supply path 562 instead of the third internal space 421 in the first communication state described later. Also, the buffer space 424 is an internal space for taking in and out the refrigerant in order to avoid locking of the piston 5.

As shown in FIGS. 1 and 2, the second partition plate 512, the third partition plate 521, and the fourth partition plate 522 are attached at mutually different positions in the longitudinal direction of the piston 5. The second partition plate 512 and the fourth partition plate 522 are attached at positions closer to the actuator 6 in this order.

The actuator 6 moves the piston 5 (the first piston 51 and the second piston 52) along its longitudinal direction (longitudinal direction of the cylinder 4). A rotational direction signal (+ θ, −θ) representing the rotational direction of the motor 7 is input to the actuator 6, and the stroke position of the piston 5 is switched according to the rotational direction signal.

In FIG. 1, the motor 7 is rotating forward, the rotation direction signal (+ θ) is input to the actuator 6, and the actuator 6 moves the first piston 51 and the second piston 52 to a stroke position away from the actuator 6. (The first communication state described later).

In FIG. 2, the motor 7 is reversely rotated, and the rotational direction signal (−θ) is input to the actuator 6, and the actuator 6 moves the first piston 51 and the second piston 52 to the stroke position closer to the actuator 6. (The second communication state described later).

As described above, the mechanical pump 2 switches the discharge direction of the refrigerant according to the rotation direction of the motor 7, so the path switching mechanism 3 communicates the inside of the first cylinder 41 and the inside of the second cylinder 42 according to the rotation direction of the motor 7. Partition plates (first to fifth partition plates 511 to 523) so that the refrigerant can be supplied from the supply path 56 regardless of the rotational direction of the motor 7 by switching the first communication state and the second communication state, respectively. Is attached.

As shown in FIGS. 1 and 2, the first internal space 411, the second internal space 412, the third internal space 421, the buffer space 423, and the buffer space 424 are independent of the first communication state and the second communication state. The following communication states are maintained. That is, the first inner space 411 communicates with the first supply path 561 and is separated from the first introduction path 571. The second inner space 412 communicates with the first introduction path 571 and is separated from the first supply path 561.

The buffer space 423 is separated from the second introduction path 572, the third introduction path 573, and the suction path 22. The third inner space 421 communicates with the suction path 22 and is separated from the third introduction path 573. The buffer space 424 is separated from the second supply path 562 and the suction path 22 and is in communication with the third introduction path 573.

In the first communication state shown in FIG. 1, the first internal space 411 communicates the discharge path 21 with the first supply path 561, and the second internal space 412 communicates with the first introduction path 571 and is separated from the discharge path 21. The buffer space 423 is in communication with the second supply path 562, the third inner space 421 is in communication with the suction path 22 and the second introduction path 572 and is separated from the second supply path 562, and the buffer space 424 is 2 separated from the introduction path 572

In the second communication state shown in FIG. 2, the first internal space 411 is separated from the discharge path 21, the second internal space 412 communicates the discharge path 21 with the first introduction path 571, and the buffer space 423 is the second supply. Separated from the path 562, the third internal space 421 communicates the suction path 22 with the second supply path 562 and separates from the second introduction path 572, and the buffer space 424 forms the second introduction path 572 and the third introduction path 573. It is in communication with

As described above, the second internal space 412 is always in communication with the first introduction path 571, and the buffer space 424 is always in communication with the third introduction path 573. As a result, when the actuator 6 moves the piston 5, the refrigerant can be taken in and out of the second internal space 412 and the buffer space 424, and locking of the piston 5 can be avoided.

FIG. 3 is a schematic view of the path switching mechanism 3 (during normal rotation) of the motor refrigerant circulating apparatus 1 of the first embodiment. FIG. 4 is a schematic view of the path switching mechanism 3 (during reverse rotation) of the motor refrigerant circulating apparatus 1 of the first embodiment. As shown in FIGS. 3 and 4, an O-ring 53 is attached to the side surface of the partition plate (the first partition plate 511 to the fifth partition plate 523), and the O-ring 53 is of the first cylinder 41 and the second cylinder 42. Internal spaces adjacent to each other are separated by being pressed by the inner wall.

In the first cylinder 41, an opening 561a of the first supply path 561, an opening 21a of the discharge path 21, and an opening 571a of the first introduction path 571 are formed. In the second cylinder 42, an opening 562a of the second supply path 562, an opening 22a of the suction path 22, an opening 572a of the second introduction path 572 and an opening 573a of the third introduction path 573 are formed. Among these, the opening 561a and the opening 562a communicate with each other through the supply path 56, and the opening 571a, the opening 572a, and the opening 573a communicate with each other through the introduction path 57.

In the first communication state shown in FIG. 3, the first internal space 411 communicates the opening 561a with the opening 21a, and the second internal space 412 communicates with the opening 571a and is separated from the opening 561a. 423 communicates with the opening 562a, the third internal space 421 connects the opening 22a with the opening 572a and is separated from the opening 562a, and the buffer space 424 communicates with the opening 573a and is separated from the opening 572a doing.

In the second communication state shown in FIG. 4, the first internal space 411 communicates with the opening 561a and is separated from the opening 21a, and the second internal space 412 communicates the opening 21a with the opening 571a, and the buffer space 423 separates from the opening 562a, the third inner space 421 connects the opening 562a and the opening 22a and separates from the opening 572a, and the buffer space 424 communicates with the opening 572a and the opening 573a .

Operation of First Embodiment
In the first communication state shown in FIG. 1 and FIG. 3, when the mechanical pump 2 rotates forward, the mechanical pump 2 sucks the refrigerant from the suction path 22 and discharges the refrigerant to the discharge path 21. At this time, the refrigerant stored in the tank 711 is introduced into the third inner space 421 through the second introduction path 572 in the path switching mechanism 3, flows from the opening 572 a to the opening 22 a, and is supplied to the suction path 22. Is pumped by the mechanical pump 2. Further, the refrigerant discharged from the mechanical pump 2 to the discharge path 21 flows from the opening 21a to the opening 561a in the first internal space 411, and the motor 7 (rotor 7 (the rotor) 72).

In the second communication state shown in FIGS. 2 and 4, when the mechanical pump 2 is reversely rotated, the mechanical pump 2 sucks the refrigerant from the discharge passage 21 and discharges the refrigerant to the suction passage 22. At this time, the refrigerant stored in the tank 711 is introduced into the second internal space 412 through the first introduction path 571 in the path switching mechanism 3, flows from the opening 571 a to the opening 21 a, and is introduced into the discharge path 21. It is sucked by the mechanical pump 2. Further, the refrigerant discharged from the mechanical pump 2 to the suction path 22 is introduced into the third inner space 421, flows from the opening 22a to the opening 562a, and is supplied to the motor via the second supply path 562 and the supply path 56. 7 (rotor 72).

As described above, regardless of the rotational direction of the motor 7 (the rotor 72) and the mechanical pump 2, the refrigerant stored in the tank 711 is transferred from the supply path 56 to the motor 7 by switching the flow path in the path switching mechanism 3. (Rotor 72) can be supplied, and the refrigerant can be reliably circulated.

Note that switching between the first communication state and the second communication state is performed by the actuator 6 receiving a rotation direction signal (+ θ, -θ) to thereby make the piston 5 a stroke position for realizing the first communication state, the second communication It is moved to the stroke position that realizes the state. At this time, since the second internal space 412 and the buffer space 424 are always in communication with the introduction path 57, the refrigerant can be taken in and out with the introduction path 57, and locking of the operation of the piston 5 can be avoided. it can.

[Effect of First Embodiment]
The motor refrigerant circulation device 1 according to the first embodiment is a motor refrigerant circulation device 1 for circulating and cooling the refrigerant to the motor 7. The motor refrigerant circulation device 1 is mechanically connected to the motor 7 and the refrigerant is It is discharged from the mechanical pump 2 at the time of normal rotation of the motor 7, the supply path 56 for supplying the refrigerant to the motor 7, the introduction path 57 for introducing the refrigerant discharged from the motor 7, and the mechanical pump 2 whose discharge direction changes. And the suction path 22 for circulating the refrigerant drawn by the mechanical pump 2 when the motor 7 rotates forward, and the discharge path 21 and the supply path 56 are rotated when the motor 7 rotates forward. The suction path 22 and the introduction path 57 are communicated with each other, and when the motor 7 rotates in the reverse direction, the suction path 22 and the supply path 56 are communicated and the discharge path 21 and the introduction path 57 are communicated. It includes a switching mechanism 3, a.

With the above configuration, even if the discharge direction of the refrigerant of the mechanical pump 2 is switched by switching the rotational direction of the motor 7, the path switching mechanism 3 can switch the communication destination of the mechanical pump 2 in conjunction with this. Therefore, regardless of the rotation direction of the motor 7 and the discharge direction of the mechanical pump 2, the refrigerant can be circulated in the forward direction, and the cost can be suppressed without using the electric oil pump to suppress the refrigerant in the motor 7. Can be circulated.

The path switching mechanism 3 divides the internal space of the cylinder 4 to which the supply path 56, the introduction path 57, the discharge path 21, and the suction path 22 are connected, and a partition plate (first partition plate 511 to A first communicating state in which a fifth partition plate 523) is attached, and the partition plate communicates the discharge path 21 with the supply path 56 at the normal rotation of the motor 7 and communicates the suction path 22 with the introduction path 57 And a piston 5 movable movably to a second communication state forming an internal space communicating the suction path 22 with the supply path 56 and communicating the discharge path 21 with the introduction path 57 when the motor 7 reversely rotates. , Moving the piston 5 in accordance with the rotational direction of the motor 7 to switch the internal space of the cylinder 4 to either the first communication state or the second communication state. It includes a eta 6, the.

With the above configuration, the communication destination of the discharge path 21 and the communication destination of the suction path 22 are switched with a simple configuration, and the forward circulation of the refrigerant is maintained regardless of the rotational direction of the mechanical pump 2, that is, the discharge direction of the refrigerant. Mechanisms can be built.

The cylinder 4 communicates with the first supply path 561 branched from the supply path 56, the first introduction path 571 branched from the introduction path 57, and the first cylinder 41 communicated with the discharge path 21 and separated from the suction path 22; A second supply path 562 branched from the supply path 56, a second introduction path 572 branched from the introduction path 57, and a second cylinder 42 communicating with the suction path 22 and separated from the discharge path 21 are provided.

The piston 5 is branched into a first piston 51 disposed in the first cylinder 41 and a second piston 52 disposed in the second cylinder 42.

The partition plates include a first partition plate 511 and a second partition plate 512 attached to the first piston 51 side by side, and a third partition plate 521 and a fourth partition plate 522 attached to the second piston 52 side by side; Equipped with

The first cylinder 41 is formed between the first partition plate 511 and the second partition plate 512, and is in communication with the first supply path 561. The first cylinder 41 is connected to the first inner space 411 of the second partition plate 512. And a second internal space 412 formed on the opposite side and in communication with the first introduction path 571.

The second cylinder 42 includes a third inner space 421 formed between the third partition plate 521 and the fourth partition plate 522 and in communication with the suction path 22.

In the first communication state, the first internal space 411 communicates the discharge path 21 with the first supply path 561, and the third internal space 421 communicates the suction path 22 with the second introduction path 572.

In the second communication state, the second internal space 412 communicates the discharge path 21 with the first introduction path 571, and the third internal space 421 communicates the suction path 22 with the second supply path 562.

According to the above configuration, the first communication state and the second communication state can be formed in the cylinder 4 only by moving the piston 5, so that the path switching mechanism 3 can be miniaturized.

In the first embodiment (the same applies to the subsequent embodiments), the attachment positions of the supply path 56 and the introduction path 57 may be reversed. In this case, the communication states are mutually switched between the first communication state and the second communication state. Therefore, when the motor 7 and the mechanical pump 2 are rotating in the normal direction, the actuator 6 moves the piston 5 to the stroke position in the second communication state, and in the reverse direction, the piston 5 is (1) It may be moved to the stroke position in which the communication state is established. Further, in the first embodiment, the supply passage 56 is branched into the first supply passage 561 and the second supply passage 562, but the cylinders are connected so that the supply passage 56 communicates with the first cylinder 41 and the second cylinder 42. 4, a large opening that crosses the wall surface between the first cylinder 41 and the second cylinder 42 may be formed, and the supply path 56 may be connected to the opening. Similarly, although the introduction path 57 is branched into the first introduction path 571 and the second introduction path 572, the first cylinder in the cylinder 4 is in communication with the first cylinder 41 and the second cylinder 42. A large opening that crosses the wall surface between the cylinder 41 and the second cylinder 42 may be formed, and the introduction path 57 may be connected to this opening.

Configuration of Second Embodiment
FIG. 5 is a schematic view of the motor refrigerant circulating apparatus 1 (during normal rotation) according to the second embodiment. FIG. 6 is a schematic view of the motor refrigerant circulation device 1 (during reverse rotation) according to the second embodiment. In the motor refrigerant circulating apparatus 1 of the second embodiment, when the air introduction path 58 is connected to the path switching mechanism 3 and cooling of the rotor 72 is unnecessary, the mechanical pump 2 is idled to reduce torque of the motor 7. The loss of the mechanical pump 2 is reduced.

The introduction path 57 branches into a first introduction path 571 and a second introduction path 572. The first introduction path 571 is connected to the first cylinder 41, and the second introduction path 572 is connected to the second cylinder 42. The discharge path 21 is connected to the first cylinder 41, and the suction path 22 is connected to the second cylinder 42.

One of the air introduction paths 58 is connected to the housing 71 (tank 711) of the motor 7 at a position higher than the liquid level of the refrigerant, and the other is connected to the cylinder 4. Thereby, even if the refrigerant flows backward from the path switching mechanism 3 to the air introduction path 58, it is possible to prevent the refrigerant from leaking to the outside.

The other of the air introduction paths 58 is branched into a first air introduction path 581, a second air introduction path 582, and a third air introduction path 583. The first air introduction path 581 is connected to the first cylinder 41, and the second air The introduction path 582 and the third air introduction path 583 are connected to the second cylinder 42.

A first partition plate 541, a second partition plate 542, and a third partition plate 543 are attached to the first piston 54 in order of proximity to the actuator 6, and the third partition plate 543 is in the longitudinal direction of the first piston 54. Attached to the end.

A seventh partition plate 554, a fourth partition plate 551, a fifth partition plate 552, and a sixth partition plate 553 are attached to the second piston 55 in order of proximity from the actuator 6, and the sixth partition plate 553 is the second piston 55 Attached to the longitudinal end of the

In the first cylinder 41, a first internal space 411 is formed between the first partition plate 541 and the second partition plate 542, and a second internal space 412 is formed between the second partition plate 542 and the third partition plate 543. In the opposite side of the second inner space 412 of the third partition plate 543, there is formed a buffer space 413 for taking in and out air in order to avoid locking of the operation of the piston 5.

In the second cylinder 42, a buffer space 423 is formed between the seventh partition plate 554 and the fourth partition plate 551, and a third internal space 421 is formed between the fourth partition plate 551 and the fifth partition plate 552 The fourth inner space 422 is formed between the fifth partition plate 552 and the sixth partition plate 553, and on the opposite side of the fourth inner space 422 of the sixth partition plate 553, locking of the operation of the piston 5 is performed. A buffer space 424 for taking in and out air is formed to avoid the problem.

As shown in FIGS. 5 and 6, the first internal space 411 to the fourth internal space 422, the buffer space 413, the buffer space 423, and the buffer space 424 have a first communication state, a second communication state, and a second communication state described later. 3 The following communication state is maintained regardless of the communication state. That is, the first internal space 411 communicates with the first supply path 561 and is separated from the first introduction path 571 and the first air introduction path 581. The second internal space 412 communicates with the first introduction path 571 and is separated from the first supply path 561 and the first air introduction path 581. The buffer space 413 is separated from the first supply path 561, the first introduction path 571, and the discharge path 21 and is in communication with the first air introduction path 581. The buffer space 423 is separated from the second introduction path 572, the suction path 22, the second air introduction path 582, and the third air introduction path 583. The third internal space 421 communicates with the suction path 22 and is separated from the second air introduction path 582 and the third air introduction path 583. The fourth inner space 422 is separated from the second supply path 562, the suction path 22, and the third air introduction path 583. The buffer space 424 is separated from the second supply path 562, the second introduction path 572, and the suction path 22, and is in communication with the third air introduction path 583.

In the first communication state shown in FIG. 5, the first internal space 411 communicates the discharge path 21 with the first supply path 561, the second internal space 412 is separated from the discharge path 21, and the buffer space 423 is the second supply. The third internal space 421 is in communication with the suction path 22 and the second introduction path 572, and the fourth internal space 422 is in communication with the second air introduction path 582 and separated from the second introduction path 572. The buffer space 424 is separated from the second air introduction path 582.

In the second communication state shown in FIG. 6, the first internal space 411 is separated from the discharge path 21, the second internal space 412 communicates the discharge path 21 with the first introduction path 571 and the buffer space 423 is the second supply. The third internal space 421 communicates with the suction path 22 and the second supply path 562 and separates from the second introduction path 572, and the fourth internal space 422 communicates with the second introduction path 572. The buffer space 424 is in communication with the second air introduction path 582 separately from the second air introduction path 582.

As described above, the buffer space 413 is always in communication with the first air introduction path 581, and the buffer space 424 is always in communication with the third air introduction path 583. Thereby, when the actuator 6 moves the piston 5, air can be taken in and out of the buffer space 413 and the buffer space 424, and locking of the piston 5 can be avoided. Further, since the air in the motor 7 is introduced into the buffer space 413 and the buffer space 424, it is possible to prevent the leakage of the air including the vaporized oil in the motor 7.

FIG. 7 is a schematic view of a path switching mechanism 3 (during normal rotation) constituting the motor refrigerant circulating apparatus 1 of the second embodiment. FIG. 8 is a schematic view of a path switching mechanism 3 (during reverse rotation) constituting the motor refrigerant circulating apparatus 1 of the second embodiment.

As shown in FIGS. 7 and 8, in the first cylinder 41, the opening 561a of the first supply path 561, the opening 21a of the discharge path 21, the opening 571a of the first introduction path 571 and the first air introduction path An opening 581 a of 581 is formed. In the second cylinder 42, an opening 562a of the second supply path 562, an opening 22a of the suction path 22, an opening 572a of the second introduction path 572, an opening 582a of the second air introduction path 582, a third air introduction An opening 583a of the path 583 is formed. Among them, the opening 561a and the opening 562a communicate with each other through the supply path 56, the opening 571a and the opening 572a communicate with each other through the introduction path 57, and the opening 581a, the opening 582a, and the opening 583a are in communication with each other via the air introduction path 58. Although the air introduction path 58 is branched into the first air introduction path 581 and the second air introduction path 582, in the cylinder 4 so that the air introduction path 58 communicates with the first cylinder 41 and the second cylinder 42. A large opening that crosses the wall surface between the first cylinder 41 and the second cylinder 42 may be formed, and the air introduction path 58 may be connected to this opening.

In the first communication state shown in FIG. 7, the first internal space 411 communicates the opening 561a with the opening 21a, the second internal space 412 communicates with the opening 571a, and the buffer space 413 communicates with the opening 581a. The buffer space 423 communicates with the opening 562a, the third internal space 421 communicates the opening 22a with the opening 572a, the fourth internal space 422 communicates with the opening 582a, and the buffer space 424 is the opening It communicates with 583a.

In the second communication state shown in FIG. 8, the first internal space 411 communicates with the opening 561a, the second internal space 412 communicates between the opening 21a and the opening 571a, and the buffer space 413 communicates with the opening 581a. The buffer space 423 is separated from the opening 562a, the third inner space 421 connects the opening 22a and the opening 562a, and is separated from the opening 572a, and the fourth inner space 422 communicates with the opening 572a. And the buffer space 424 is in communication with the opening 582a and the opening 583a.

The actuator 6 can measure the temperature (T) of the motor 7 (rotor 72) by a temperature sensor (not shown) attached to the motor 7. When the temperature (T) is higher than a predetermined temperature (Tth), the piston 6 The stroke position 5 is moved to the stroke position forming the first communication state or the stroke position forming the second communication state based on the rotation direction signal (+ θ, −θ).

On the other hand, when the temperature (T) becomes lower than the predetermined temperature (Tth), the actuator 6 determines that cooling of the motor 7 (the rotor 72) is not necessary, and the rotation direction signal (+ θ, -θ) Regardless of the above, the stroke position of the piston 5 is moved to the stroke position in the third communication state described later, and the mechanical pump 2 idles.

FIG. 9 is a schematic view of a motor refrigerant circulation device 1 (in normal rotation idle) according to the second embodiment. FIG. 10 is a schematic view of a motor refrigerant circulation device 1 (during reverse rotation idle rotation) of the second embodiment. FIG. 11 is a schematic view of the route switching mechanism 3 constituting the motor refrigerant circulating apparatus 1 according to the second embodiment, and the solid line arrow indicates the flow direction of air when the mechanical pump 2 rotates forward. The arrows indicate the flow direction of air when the mechanical pump 2 reverses.

As shown in FIGS. 9 to 11, the third communication state is similar to the first communication state, but the second introduction path 572 is in communication with the third inner space 421 and the fourth inner space 422. It has become. That is, as shown in FIG. 11, the diameter of the opening 572a (first opening) of the second introduction path 572 is larger than the thickness of the fifth partition plate 552, and in the third communication state, the fifth partition The third inner space 421 and the fourth inner space 422 communicate with each other through the opening 572 a by the side of the fifth partition plate 552 facing the opening 572 a in a manner that the opening 572 a protrudes on both sides of the plate 552 It is in a state of

As shown in FIGS. 9 and 10, in the path switching mechanism 3, the stroke position of the piston 5 forming the third communication state is the stroke position of the piston 5 forming the first communication state, and the second communication state And the stroke position of the piston 5. Thereby, an increase in the stroke amount of the actuator 6 can be avoided.

As shown in FIGS. 9 and 10, the air introduction path 58 (second air introduction path 582) includes a fourth internal space 422, a second introduction path 572 (opening 572a), a third internal space 421, and a suction path 22. It communicates with the mechanical pump 2 via The mechanical pump 2 is in communication with the first supply path 561 via the discharge path 21 and the first internal space 411.

As shown in FIG. 9 and FIG. 11 (solid arrows), when the motor 7 and the mechanical pump 2 are normally rotating, the suction passage 22 has a negative pressure, so the air introduction passage 58 (second air) Air is introduced into the introduction path 582, and the air is sucked by the mechanical pump 2 through the fourth inner space 422, the opening 572 a, the third inner space 421, and the suction path 22. At this time, since air has a specific gravity smaller than that of the refrigerant, the air is drawn by the mechanical pump 2 preferentially to the refrigerant. Further, the air discharged from the mechanical pump 2 to the discharge path 21 is discharged from the first supply path 561 (supply path 56) to the motor 7 (housing 71) via the first internal space 411. As a result, the mechanical pump 2 starts rotating in the forward direction, and the air introduced from the motor 7 via the air introduction path 58 is returned to the motor 7 via the supply path 56, and the air is motor 7 (housing 71) And the route switching mechanism 3.

Further, as shown in FIG. 10 and FIG. 11 (broken line arrow), when the motor 7 and the mechanical pump 2 are reversely rotated, the discharge passage 21 has a negative pressure, so that the supply passage 56 (first supply Air is introduced into the path 561, and the air is drawn into the mechanical pump 2 via the first internal space 411 and the discharge path 21. Further, the air discharged from the mechanical pump 2 to the suction path 22 passes from the second air introduction path 582 (air introduction path 58) through the third internal space 421, the opening 572a, and the fourth internal space 422 to the motor 7. (Housing 71). As a result, the mechanical pump 2 starts rotating in reverse, and the air introduced from the motor 7 via the supply path 56 is returned to the motor 7 via the air introduction path 58, and the air is transferred to the motor 7 (housing 71). It circulates with the path switching mechanism 3.

Then, as shown in FIGS. 9 and 10, by maintaining the state where air is sucked by the mechanical pump 2 for a while, the inside of the mechanical pump 2 is filled with air, and the mechanical pump 2 idles. Become.

[Operation of Second Embodiment]
When the temperature (T) is higher than a predetermined temperature (Tth), the actuator 6 forms a first communication state based on the rotation direction signal (+ θ, −θ) of the stroke position of the piston 5, Or move to the stroke position that forms the second communication state.

In the first communication state shown in FIGS. 5 and 7, when the mechanical pump 2 rotates forward, the mechanical pump 2 sucks the refrigerant from the suction path 22 and discharges the refrigerant to the discharge path 21. At this time, the refrigerant stored in the tank 711 is introduced into the third internal space 421 through the second introduction path 572 in the path switching mechanism 3, and the refrigerant introduced into the third internal space 421 passes through the suction path 22. It is sucked by the mechanical pump 2. Further, the refrigerant discharged from the mechanical pump 2 to the discharge path 21 is supplied to the motor 7 (rotor 72) via the first inner space 411 and the first supply path 561 (supply path 56).

In the second communication state shown in FIGS. 6 and 8, when the mechanical pump 2 reverses, the mechanical pump 2 sucks the refrigerant from the discharge passage 21 and discharges the refrigerant in the suction passage 22. At this time, the refrigerant stored in the tank 711 is introduced into the second internal space 412 through the first introduction path 571 in the path switching mechanism 3, and the refrigerant introduced into the second internal space 412 through the discharge path 21. It is sucked by the mechanical pump 2. The refrigerant discharged from the mechanical pump 2 to the suction path 22 is supplied to the motor 7 (rotor 72) via the third inner space 421 and the second supply path 562 (supply path 56).

As described above, also in the second embodiment, regardless of the rotational direction of the motor 7 (the rotor 72) and the mechanical pump 2, the refrigerant stored in the tank 711 is transmitted to the motor 7 (the rotor 7 72), and circulation of the refrigerant can be reliably performed.

On the other hand, when the temperature (T) becomes lower than the predetermined temperature (Tth), the actuator 6 sets the stroke position of the piston 5 to the stroke position where it is in the third communication state, as shown in FIGS. Move and make the mechanical pump 2 idle.

In addition, after the actuator 6 moves the piston 5 to the stroke position in the third communication state, a stroke position at which the first communication state is formed based on the rotation direction signal (+ θ, -θ) after a predetermined time has elapsed. Alternatively, the mechanical pump 2 may be temporarily moved to the stroke position where the second communication state is formed, and the refrigerant may be temporarily supplied to the inside of the mechanical pump 2 to prevent wear due to insufficient lubrication.

Thereafter, when the temperature (T) becomes equal to or higher than the predetermined temperature (Tth), the actuator 6 performs a stroke position for forming the first communication state based on the rotation direction signal (+ θ, −θ). Or, it is moved to the stroke position where the second communication state is formed, and the circulation of the refrigerant to the motor 7 (rotor 72) is restarted.

[Effect of Second Embodiment]
In the motor refrigerant circulating apparatus 1 according to the second embodiment, the cylinder 4 is connected to an air introduction path 58 for introducing air, and the partition plate (fifth partition plate 552) forms a first communication state. At a position between the position for forming the second communication state, the discharge path 21 communicates with the supply path 56 and the suction path 22 is connected to the air introduction path via the introduction path 57 (the opening 572a of the second introduction path 572). It is attached to the piston 5 so as to be switchable to a third communication state forming an internal space communicated with the valve 58. Then, the actuator 6 moves the piston 5 to be in the third communication state when the temperature of the refrigerant becomes lower than a predetermined temperature.

With the above configuration, when it is not necessary to cool the motor 7 (the rotor 72), air is supplied to the mechanical pump 2 to make it run idle, thereby reducing the loss of the torque (output) of the motor 7 due to the rotation of the mechanical pump 2. can do. In addition, since the stroke position forming the third communication state is set between the stroke position forming the first communication state and the stroke position forming the second communication state, the stroke length of the piston 5 needs to be increased. The load on the actuator 6 can be avoided.

The cylinder 4 communicates with the first supply path 561 branched from the supply path 56, the first introduction path 571 branched from the introduction path 57, and the first cylinder 41 communicated with the discharge path 21 and separated from the suction path 22; It communicates with the second supply path 562 branched from the supply path 56, the second introduction path 572 branched from the introduction path 57, the suction path 22 and the air introduction path 58 (second air introduction path 582) and is separated from the discharge path 21 And a second cylinder 42.

The piston 5 is branched into a first piston 54 disposed in the first cylinder 41 and a second piston 55 disposed in the second cylinder 42.

The partition plates are a first partition plate 541, a second partition plate 542, and a third partition plate 543 mounted side by side with the first piston 54, and a fourth partition plate 551 mounted side by side with the second piston 55, And a fifth partition plate 552 and a sixth partition plate 553.
Ru.

The first cylinder 41 is formed between the first partition plate 541 and the second partition plate 542, and includes the first internal space 411 communicating with the first supply path 561, the second partition plate 542, and the third partition plate 543. And a second internal space 412 communicating with the first introduction path 571 formed therebetween.

The second cylinder 42 is formed between the fourth partition 551 and the fifth partition 552, and is in communication between the third inner space 421 communicating with the suction path 22, and between the fifth partition 552 and the sixth partition 553. And a fourth internal space 422 formed in the

In the third communication state, the first internal space 411 communicates the discharge path 21 with the first supply path 561, the third internal space 421 communicates with the suction path 22, and the fourth internal space 422 is the second The third internal space 421 and the fourth internal space 422 are in communication with each other through the second introduction path 572 (opening 572a) in communication with the air introduction path 582 (the air introduction path 58).

According to the above configuration, the first communication state, the second communication state, and the third communication state can be formed in the cylinder 4 simply by moving the piston 5, so the path switching mechanism 3 can be miniaturized.

The diameter of the opening 572a (first opening) connected to the second cylinder 42 of the second introduction path 572 is larger than the thickness of the fifth partition plate 552, and in the third communication state, both surfaces of the fifth partition plate 552 The third inner space 421 and the fourth inner space 422 communicate with each other through the opening 572 a by the side surface of the fifth partition plate 552 facing the opening 572 a in a manner that the opening 572 a protrudes to the side. Thus, the third internal space 421 and the fourth internal space 422 can be communicated with each other in the third communication state with a simple configuration.

The actuator 6 may be temporarily returned to the first communication state or the second communication state according to the rotation direction of the motor 7 every predetermined time while the internal space of the cylinder 4 is in the third communication state. As a result, the refrigerant can be temporarily supplied to the inside of the mechanical pump 2 and wear due to insufficient lubrication of the mechanical pump 2 can be prevented.

The air introduction path 58 is in communication with the housing 71 of the motor 7. Thereby, even if the refrigerant flows backward from the path switching mechanism 3 to the air introduction path 58, it is possible to prevent the refrigerant from leaking to the outside. In the second embodiment, the bottom of the first cylinder 41 and the bottom of the second cylinder 42 are opened, and the first air introduction path 581 (buffer space 413) and the third air introduction path 583 (buffer space 424) are opened. Even if omitted, it is possible to form the first communication state, the second communication state, and the third communication state.

In the second embodiment (also in the first embodiment), the piston 5 is pulled out of the actuator 6 to form a first communication state, and the piston 5 is retracted to form a second communication state. However, for example, the mounting positions of the cylinder 4 of the discharge path 21, the suction path 22, the supply path 56, the introduction path 57, and the air introduction path 58 are reversed in the longitudinal direction of the cylinder 4 Also, the mounting positions of the first partition plate 511 to the fifth partition plate 523 of the first embodiment are reversed in the longitudinal direction of the piston 5. Thereby, it is possible to form the second communication state by drawing out the piston 5 from the actuator 6, and to form the first communication state by retracting the piston 5 on the contrary.

Third Embodiment
FIG. 12 is a schematic view of the motor refrigerant circulation device 1 (in normal rotation idle) according to the third embodiment. FIG. 13 is a schematic view of a motor refrigerant circulation device 1 (during reverse rotation idle rotation) of the third embodiment.

The motor refrigerant circulation device 1 of the third embodiment is obtained by increasing the stroke length of the actuator 6 in the motor refrigerant circulation device 1 of the second embodiment. The actuator 6 (not shown in FIG. 12 and FIG. 13) has openings for connecting all the partition plates to the supply path 56, the discharge path 21, the suction path 22 and the cylinder 4 of the air introduction path 58. The piston 5 is movable so as to be positioned on one side of the piston 5 in the longitudinal direction.

That is, the actuator 6 is positioned closer to the actuator 6 than the respective openings where the third partition plate 543 is connected to the cylinder 4 of the first supply path 561, the discharge path 21, and the first air introduction path 581. , Move the piston 5 so that the sixth partition plate 553 is closer to the actuator 6 than the openings of the second introduction path 572, the suction path 22, and the cylinder 4 of the second air introduction path 582. It is possible. By moving the piston 5 in this manner, air is charged from the air introduction path 58 into the first cylinder 41 and the second cylinder 42.

As shown in FIG. 12, when the piston 5 is moved as described above in a state where the motor 7 and the mechanical pump 2 rotate forward, the suction path 22 becomes negative pressure, and the air introduction path 58 (second Air is introduced into the second cylinder 42 via the air introduction path 582 and the third air introduction path 583), and the air reaches the mechanical pump 2 via the suction path 22 communicated with the second cylinder 42. Further, the air discharged from the mechanical pump 2 to the discharge path 21 is discharged to the first cylinder 41, and the air is communicated via the first supply path 561 (supply path 56) in communication with the first cylinder 41 (motor 7). It is discharged into the housing 71). As a result, the mechanical pump 2 idles in normal rotation, and the air introduced from the motor 7 via the air introduction path 58 is returned to the motor 7 via the supply path 56, and the air is transferred to the motor 7 (housing 71). It circulates with the path switching mechanism 3.

In addition, when the air is circulated as described above, the air discharged to the first cylinder 41 may flow through the first air introduction path 581. In this case, the air is introduced into the second cylinder 42 through the second air introduction path 582 and introduced into the suction path 22 communicating with the second cylinder 42, and the air is introduced into the mechanical pump 2, the first cylinder 41, A circulation path in which the second cylinder 42 and the mechanical pump 2 circulate in this order is formed.

As shown in FIG. 13, when the piston 5 is moved as described above in a state where the motor 7 and the mechanical pump 2 are reversely rotated, the discharge passage 21 has a negative pressure, and the supply passage 56 (first supply passage Air is introduced into the first cylinder 41 via 561), and the air reaches the mechanical pump 2 via the discharge path 21 communicated with the first cylinder 41. Further, the air discharged from the mechanical pump 2 to the suction path 22 is discharged to the second cylinder 42, and the air is communicated via the second air introduction path 582 (air introduction path 58) in communication with the second cylinder 42. 7 (housing 71). As a result, the mechanical pump 2 rotates in the reverse direction and the air introduced from the motor 7 via the supply path 56 is returned to the motor 7 via the air introduction path 58, and the air and the path between the motor 7 (housing 71) It circulates with the switching mechanism 3.

In addition, when the air is circulated as described above, the air introduced into the second air introduction path 582 may be introduced into the first cylinder 41 via the first air introduction path 581. In this case, the air is introduced into the discharge path 21 communicating with the first cylinder 41, and a circulation path is formed in which the air circulates in the order of the mechanical pump 2, the second cylinder 42, the first cylinder 41, and the mechanical pump 2. Ru.

In the motor refrigerant circulating apparatus 1 of the third embodiment, although the stroke amount of the actuator 6 becomes long, since the inside of the cylinder 4 can be filled with air immediately, the loss of the output of the motor 7 due to the rotation of the mechanical pump 2 can be shortened. Can be reduced.

Fourth Embodiment
FIG. 14 is a schematic view of a path switching mechanism 3 (when rotating around a forward rotation air) constituting the motor refrigerant circulating apparatus 1 of the fourth embodiment. FIG. 15 is a schematic view of a path switching mechanism 3 (during reverse rotation around the air) which constitutes the motor refrigerant circulating apparatus 1 of the fourth embodiment. In the motor refrigerant circulating apparatus 1 of the fourth embodiment, the opening 572a (first opening) of the second introduction path 572 is the path switching mechanism 3 constituting the motor refrigerant circulating apparatus 1 of the second embodiment. It is in communication with the first cylinder 41. The diameter of the opening 21 a (second opening) connected to the first cylinder 41 of the discharge path 21 is designed to be larger than the thickness of the second partition plate 542.

Then, in the third communication state, the opening 572a (first opening) is in communication with the second internal space 412, and the opening 21a (second opening) protrudes on both sides of the second partition plate 542 In the aspect, the side surface of the second partition plate 542 is opposed to the opening 21a (second opening), so that the first internal space 411 and the second internal space 412 mutually communicate via the opening 21a (second opening). It is in communication.

As shown in FIG. 14, when the piston 5 is moved to the position where the third communication state is formed in a state in which the motor 7 and the mechanical pump 2 are rotated forward, air is introduced by the suction path 22 becoming negative pressure. The air is introduced into the fourth inner space 422 via the path 58 (the second air introduction path 582), and the air is given priority over the refrigerant for the above reason and the third via the opening 572a of the second introduction path 572 The air is sucked into the mechanical pump 2 by being introduced into the internal space 421 and further into the suction path 22 communicating with the third internal space 421.

Further, the air discharged from the mechanical pump 2 to the discharge path 21 is discharged to the first inner space 411, and the air is communicated via the first inner path 411 with the first supply path 561 (supply path 56). 7 (housing 71). As a result, the mechanical pump 2 idles in normal rotation, and the air introduced from the motor 7 via the air introduction path 58 is returned to the motor 7 via the supply path 56, and the air is transferred to the motor 7 (housing 71). It circulates with the path switching mechanism 3.

In the third communication state, the opening 21 a of the discharge path 21 and the opening 572 a of the second introduction path 572 communicate with each other in the second internal space 412. Therefore, when the air is circulated for a while as described above, the air discharged to the second inner space 412 may flow to the third inner space 421 through the opening 572 a of the second introduction path 572. In this case, the air is again introduced into the suction path 22 to form a circulation path in which the air circulates in the order of the mechanical pump 2, the second internal space 412, the third internal space 421, and the mechanical pump 2. .

As shown in FIG. 15, when the piston 5 is moved to the position where the third communication state is formed in a state where the motor 7 and the mechanical pump 2 are reversely rotated, the discharge path 21 has a negative pressure, and the supply path 56 The air is introduced into the first internal space 411 via the (first supply path 561), and the air is sucked into the mechanical pump 2 by the introduction of the air into the discharge path 21.

Further, the air discharged from the mechanical pump 2 to the suction path 22 is discharged to the third inner space 421, and the air is introduced into the fourth inner space 422 through the opening 572 a of the second introduction path 572. The air is introduced into the second air introduction path 582 (air introduction path 58) communicating with the internal space 422, and is discharged to the motor 7 (housing 71). As a result, the mechanical pump 2 rotates in the reverse direction and the air introduced from the motor 7 via the air introduction path 58 is returned to the motor 7 via the supply path 56, and the air and the path between the motor 7 (housing 71) It circulates with the switching mechanism 3.

In addition, if the air is circulated for a while as described above, the air discharged to the third inner space 421 may flow to the second inner space 412 through the opening 572 a of the second introduction path 572. In this case, the air is introduced into the discharge path 21 from the opening 21a, so that the circulation path in which the air circulates in the order of the mechanical pump 2, the third internal space 421, the second internal space 412, and the mechanical pump 2 is It is formed.

In the motor refrigerant circulating apparatus 1 of the fourth embodiment, a plurality of air flow paths can be formed without lengthening the stroke amount of the actuator 6, and therefore, the mechanical resistance of the air can be reduced to reduce the mechanical resistance of the motor 7. The loss due to the rotation of the pump 2 can be further reduced, and the load on the actuator 6 can be reduced.

As mentioned above, although the embodiment of the present invention was described, the above-mentioned embodiment showed only a part of application example of the present invention, and in the meaning of limiting the technical scope of the present invention to the concrete composition of the above-mentioned embodiment. Absent.

Claims

A refrigerant circulating apparatus for a motor, which circulates a refrigerant through a motor for cooling,
A mechanical pump mechanically connected to the motor and the discharge direction of the refrigerant is switched according to the rotation direction of the motor;
A supply path for supplying the refrigerant to the motor, an introduction path for introducing the refrigerant discharged from the motor, and a discharge path for circulating the refrigerant discharged from the mechanical pump when the motor rotates forward; A suction path for circulating the refrigerant drawn by the mechanical pump at the time of normal rotation of the motor is connected, and the discharge path and the supply path are communicated at the time of normal rotation of the motor and the suction path and the introduction path And a path switching mechanism for establishing communication between the suction path and the supply path at the time of reverse rotation of the motor and connecting the discharge path and the introduction path.
The path switching mechanism is
A cylinder to which the supply path, the introduction path, the discharge path, and the suction path are connected;
A partition plate for partitioning the internal space of the cylinder is attached, and the partition plate communicates the discharge path with the supply path when the motor rotates in the normal direction, and forms an internal space communicating the suction path with the introduction path. Movable so as to be switchable between a first communication state and a second communication state in which the suction path and the supply path are communicated and the discharge path and the introduction path are communicated when the motor reversely rotates. The piston to
The motor refrigerant circulation according to claim 1, further comprising: an actuator that moves the piston in accordance with the rotation direction of the motor, and switches the internal space of the cylinder to any one of the first communication state and the second communication state. apparatus.
The cylinder is
A first supply path branched from the supply path, a first introduction path branched from the introduction path, and a first cylinder in communication with the discharge path and separated from the suction path;
And a second supply path branched from the supply path, a second introduction path branched from the introduction path, and a second cylinder communicating with the suction path and separated from the discharge path.
The piston is
A first piston disposed in the first cylinder;
Branched into a second piston disposed in the second cylinder,
The partition plate is
A first partition plate and a second partition plate mounted side by side with the first piston;
And a third partition plate and a fourth partition plate mounted side by side with the second piston,
The first cylinder is
A first internal space formed between the first partition and the second partition and in communication with the first supply path;
And a second internal space formed on the opposite side of the first internal space of the second partition plate and in communication with the first introduction path,
The second cylinder is
A third internal space formed between the third partition plate and the fourth partition plate and in communication with the suction path;
In the first communication state,
The first internal space communicates the discharge path with the first supply path,
The third internal space communicates the suction path with the second introduction path,
In the second communication state,
The second internal space communicates the discharge path with the first introduction path,
The motor refrigerant circulating apparatus according to claim 2, wherein the third internal space communicates the suction path and the second supply path.
An air introduction path for introducing air is connected to the cylinder,
The partition plate communicates the discharge path with the supply path at a position between the position for forming the first communication state and the position for forming the second communication state, and the suction via the introduction path. The piston is attached to the piston so as to be switchable to a third communication state forming an internal space communicating the path with the air introduction path,
The motor refrigerant circulating apparatus according to claim 2, wherein the actuator moves the piston to be in the third communication state when the temperature of the refrigerant becomes lower than a predetermined temperature.
The cylinder is
A first supply path branched from the supply path, a first introduction path branched from the introduction path, and a first cylinder in communication with the discharge path and separated from the suction path;
And a second supply path branched from the supply path, a second introduction path branched from the introduction path, the suction path, and a second cylinder communicated with the air introduction path and separated from the discharge path. ,
The piston is
A first piston disposed in the first cylinder;
Branched into a second piston disposed in the second cylinder,
The partition plate is
A first partition plate mounted in parallel to the first piston, a second partition plate, and a third partition plate;
And a fourth partition plate, a fifth partition plate, and a sixth partition plate, which are attached side by side to the second piston,
The first cylinder is
A first internal space formed between the first partition and the second partition and in communication with the first supply path;
And a second internal space formed between the second partition plate and the third partition plate and in communication with the first introduction path,
The second cylinder is
A third internal space formed between the fourth partition plate and the fifth partition plate and in communication with the suction path;
And a fourth internal space formed between the fifth partition plate and the sixth partition plate,
In the first communication state,
The first internal space communicates the discharge path with the first supply path,
The third internal space communicates the suction path with the second introduction path,
In the second communication state,
The second internal space communicates the discharge path with the first introduction path,
The third internal space communicates the suction path with the second supply path,
In the third communication state,
The first internal space communicates the discharge path with the first supply path,
The third internal space communicates with the suction path,
The fourth internal space is in communication with the air introduction path,
The motor refrigerant circulating apparatus according to claim 4, wherein the third internal space and the fourth internal space are in communication with each other via the second introduction path.
The diameter of the first opening connected to the second cylinder of the second introduction path is larger than the thickness of the fifth partition plate,
In the third communication state, the side surface of the fifth partition plate faces the first opening portion in a mode in which the first opening portion protrudes on both sides of the fifth partition plate, and the third internal space The motor refrigerant circulating apparatus according to claim 5, wherein the fourth inner spaces communicate with each other through the first opening.
The first opening communicates with the first cylinder,
The diameter of the second opening connected to the first cylinder of the discharge path is larger than the thickness of the second partition plate,
In the third communication state,
The first opening communicates with the second internal space, and the side surface of the second partition is in the second opening in a mode in which the second opening protrudes on both sides of the second partition. The motor refrigerant circulating apparatus according to claim 6, wherein the first internal space and the second internal space communicate with each other through the second opening by facing each other.
4. The actuator according to claim 4, wherein the actuator temporarily returns the first communication state or the second communication state according to the rotation direction of the motor every predetermined time while the internal space of the cylinder is in the third communication state. The refrigerant | coolant circulation apparatus for motors of any one of 7.
An air introduction path for introducing air is connected to the cylinder,
The actuator is located on one side in the longitudinal direction of the piston than an opening of each of the partition plates connected to the supply path, the discharge path, the suction path, and the cylinder of the air introduction path. The motor refrigerant circulating apparatus according to claim 2, wherein the piston is movable to be positioned.
The motor refrigerant circulating apparatus according to any one of claims 4 to 9, wherein the air introduction path is in communication with a housing of the motor.