JP6726360B2 - Refrigerant circulation device for motor - Google Patents

Description

The present invention relates to a refrigerant circulation device for a motor.

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

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

Therefore, it is an object of the present invention to provide a motor coolant circulation device that can circulate coolant through a motor without using an electric oil pump.

A motor coolant circulation device according to one aspect of the present invention is a motor coolant circulation device that circulates a coolant in a motor to cool it. This device is a mechanical pump mechanically connected to the motor, 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, and an introduction path for introducing the refrigerant discharged from the motor. , A discharge path for circulating the refrigerant discharged from the mechanical pump during the normal rotation of the motor and a suction path for flowing the refrigerant drawn by the mechanical pump during the forward rotation of the motor are connected, and discharge during the forward rotation of the motor A path switching mechanism that connects the path and the supply path to each other, connects the suction path and the introduction path to each other, and connects the suction path and the supply path to each other and the discharge path and the introduction path when the motor rotates in the reverse direction.

FIG. 1 is a schematic diagram of a motor coolant circulation device (in forward rotation) according to the first embodiment. FIG. 2 is a schematic diagram of the motor coolant circulation device (during reverse rotation) of the first embodiment. FIG. 3 is a schematic diagram of a path switching mechanism (during normal rotation) that constitutes the refrigerant circulation device for a motor of the first embodiment. FIG. 4 is a schematic diagram of a path switching mechanism (during reverse rotation) that constitutes the motor coolant circulation device of the first embodiment. FIG. 5 is a schematic diagram of the motor refrigerant circulation device (in the normal rotation) of the second embodiment. FIG. 6 is a schematic diagram of the motor coolant circulation device (during reverse rotation) of the second embodiment. FIG. 7 is a schematic diagram of a path switching mechanism (during normal rotation) that constitutes the motor coolant circulation device of the second embodiment. FIG. 8 is a schematic diagram of a path switching mechanism (during reverse rotation) that constitutes the refrigerant circulation device for a motor of the second embodiment. FIG. 9 is a schematic view of a motor refrigerant circulation device (in a normal rotation idling state) of the second embodiment. FIG. 10 is a schematic diagram of a motor refrigerant circulation device (in reverse rotation idling) of the second embodiment. FIG. 11 is a schematic diagram of a path switching mechanism that constitutes the motor coolant circulation device of the second embodiment, in which the solid arrow indicates the air flow direction when the mechanical pump is rotating normally, and the dashed arrow indicates the machine. The direction of air flow when the pump is rotated in the reverse direction is shown. FIG. 12 is a schematic diagram of a motor refrigerant circulation device (in the normal rotation idling state) of the third embodiment. FIG. 13 is a schematic diagram of the motor refrigerant circulation device (when the engine is running in reverse rotation idle) according to the third embodiment. FIG. 14 is a schematic diagram of a path switching mechanism (in the normal rotation idle mode) that constitutes the motor refrigerant circulation apparatus of the fourth embodiment. FIG. 15 is a schematic diagram of a path switching mechanism (in the reverse rotation idle state) that constitutes the motor coolant circulation device 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 diagram of a motor coolant circulation device 1 (during normal rotation) of the first embodiment. FIG. 2 is a schematic diagram of the motor coolant circulation device 1 (during reverse rotation) of the first embodiment.

The motor refrigerant circulation device 1 of the first embodiment serves as a circulation path for a refrigerant such as oil that cools the motor 7 (rotor 72). The motor coolant circulation device 1 includes a mechanical pump 2 mechanically connected to the shaft 721 of the rotor 72, and a path switching mechanism 3. The motor 7 (housing 71) and the path switching mechanism 3 are connected by a refrigerant supply path 56 and a refrigerant introduction path 57.

The motor 7 has a rotor 71 (and a stator) housed in a housing 71, 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 below 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 is mechanically connected to the shaft 721 via a gear (not shown) to rotate according to the rotational force of the rotor 72 and to follow the rotational direction of the rotor 72. The rotation direction 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 (rotor 72) via the supply path 56, and the refrigerant accumulated in the tank 711 is introduced into the introduction path 57 by the suction force of the mechanical pump 2. To be done.

The mechanical pump 2 and the path switching mechanism 3 are connected via a discharge path 21 and a 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 normally, and the suction path 22 sucks the refrigerant that the mechanical pump 2 sucks when the mechanical pump 2 rotates normally. Is a distribution route. On the other hand, when the mechanical pump 2 is rotated in the reverse direction, the discharge passage 21 serves as a passage through which the refrigerant sucked by the mechanical pump 2 flows, and the suction passage 22 serves as a passage 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 orientation of the opening are the same. 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 are provided. 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 arranged so as to be parallel to each other, the first piston 51 is housed in the first cylinder 41, and the second piston 52 is housed in the second cylinder 42. 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 from the actuator 6, and the second partition plate 512 is attached to an end portion of the first piston 51 in the longitudinal direction. There is.

A fifth partition plate 523, a third partition plate 521, and a fourth partition plate 522 are attached to the second piston 52 in the order closer to the actuator 6, and the fourth partition plate 522 is an end portion in the longitudinal direction of the second piston 52. 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 a second internal space is formed on the opposite side of the second partition plate 512 from the first internal space 411. 412 is 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 fourth partition plate 522 from the third internal space 421. The buffer space 423 is an internal space that communicates with the second supply path 562 instead of the third internal space 421 in a first communication state described later. The buffer space 424 is an internal space for taking in and out the refrigerant in order to avoid the lock 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 positions different from each other in the longitudinal direction of the piston 5, and the third partition plate 521, The second partition plate 512 and the fourth partition plate 522 are attached in this order at positions close to the actuator 6.

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

In FIG. 1, the motor 7 is rotating normally, 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 the stroke position away from the actuator 6. (First communication state described later).

In FIG. 2, the motor 7 is rotated in the reverse direction, 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 the stroke position where they are brought close to the actuator 6. (The second communication state described later).

As described above, since the mechanical pump 2 switches the discharge direction of the refrigerant according to the rotation direction of the motor 7, the path switching mechanism 3 causes the path switching mechanism 3 to communicate with the inside of the first cylinder 41 and the inside of the second cylinder 42 according to the rotation direction of the motor 7. The partition plates (the first partition plate 511 to the fifth partition plate 523) are switched so that the refrigerant can be supplied from the supply path 56 regardless of the rotation direction of the motor 7 by switching between the first communication state and the second communication state. 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 status is maintained. That is, the first internal space 411 communicates with the first supply path 561 and is separated from the first introduction path 571. The second internal 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 internal space 421 communicates with the suction passage 22 and is separated from the third introduction passage 573. The buffer space 424 is separated from the second supply path 562 and the suction path 22 and communicates 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 communicates with the second supply path 562, the third internal space 421 communicates 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 It is 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 and 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 has the second introduction path 572 and the third introduction path 573. 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. Thereby, 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 the piston 5 can be prevented from being locked.

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

The first cylinder 41 is formed with 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. The second cylinder 42 is formed with 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. Of these, the opening 561a and the opening 562a communicate with each other via the supply path 56, and the opening 571a, the opening 572a, and the opening 573a communicate with each other via 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, and the buffer space 423 communicates with the opening 562a, the third internal space 421 communicates the opening 22a and the opening 572a and separates from the opening 562a, and the buffer space 424 communicates with the opening 573a and separates 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 with the opening 21a and the opening 571a, so that the buffer space 423 is separated from the opening 562a, the third internal space 421 communicates the opening 562a with the opening 22a and is separated 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 FIGS. 1 and 3, when the mechanical pump 2 rotates in the normal direction, 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, circulates from the opening 572a to the opening 22a, and is supplied to the suction path 22. Is sucked by the mechanical pump 2. In addition, the refrigerant discharged from the mechanical pump 2 to the discharge path 21 flows from the opening 21 a to the opening 561 a in the first internal space 411, and passes through the first supply path 561 and the supply path 56 to the motor 7 (rotor). 72).

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

As described above, regardless of the rotation directions of the motor 7 (rotor 72) and the mechanical pump 2, the refrigerant accumulated in the tank 711 is switched from the supply path 56 to the motor 7 by switching the flow path in the path switching mechanism 3. It can be supplied to the (rotor 72), and the refrigerant can be circulated reliably.

The switching between the first communication state and the second communication state is performed by the actuator 6 receiving the rotation direction signal (+θ, −θ) so that the piston 5 is moved to the stroke position to realize the first communication state and the second communication state. It is moved to the stroke position that realizes the state. At that 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 of the introduction path 57, and the operation lock of the piston 5 can be avoided. it can.

[Effects of First Embodiment]
The motor coolant circulation device 1 according to the first embodiment is a motor coolant circulation device 1 that circulates a coolant in the motor 7 to cool it, and is mechanically connected to the motor 7 so that the coolant flows according to the rotation direction of the motor 7. The mechanical pump 2 that switches the discharge direction, the supply path 56 that supplies the refrigerant to the motor 7, the introduction path 57 that introduces the refrigerant discharged from the motor 7, and the discharge from the mechanical pump 2 when the motor 7 rotates normally. The discharge path 21 for circulating the refrigerant is connected to the suction path 22 for circulating the refrigerant sucked by the mechanical pump 2 when the motor 7 rotates normally, and the discharge path 21 and the supply path 56 are connected when the motor 7 rotates normally. There is provided a path switching mechanism 3 which makes the suction path 22 and the introduction path 57 communicate with each other and makes the suction path 22 and the supply path 56 communicate with each other and the discharge path 21 and the introduction path 57 communicate with each other when the motor 7 reversely rotates.

With the above configuration, even if the refrigerant discharge direction of the mechanical pump 2 is switched by switching the rotation 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, the refrigerant can be circulated in the forward direction regardless of the rotation direction of the motor 7 and the discharge direction of the mechanical pump 2, and the cost can be suppressed and the refrigerant can be supplied to the motor 7 without using an electric oil pump. Can be circulated.

The path switching mechanism 3 includes a 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 partition plate 511 to partition the internal space of the cylinder 4). A fifth partition plate 523) is attached, and the partition plate forms a first communication state in which the discharge path 21 and the supply path 56 are communicated with each other and the suction path 22 and the introduction path 57 are communicated with each other when the motor 7 is normally rotated. And a second communication state in which the suction passage 22 and the supply passage 56 are communicated with each other and the discharge passage 21 and the introduction passage 57 are communicated with each other when the motor 7 is rotated in the reverse direction. An actuator 6 that moves the piston 5 according to the rotation direction of the motor 7 and switches the internal space of the cylinder 4 to either one of the first communication state and the second communication state.

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

The cylinder 4 is connected to 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 communicating 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 arranged in the first cylinder 41 and a second piston 52 arranged in the second cylinder 42.

The partition plate includes a first partition plate 511 and a second partition plate 512 mounted side by side on the first piston 51, a third partition plate 521 and a fourth partition plate 522 mounted side by side on the second piston 52, Equipped with.

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

The second cylinder 42 includes a third internal space 421 formed between the third partition plate 521 and the fourth partition plate 522 and communicating 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 with the suction path 22 and the second introduction path 572.

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

With the above configuration, the first communication state and the second communication state can be formed in the cylinder 4 simply by moving the piston 5, so that the path switching mechanism 3 can be downsized.

In addition, 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 state is 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 where the second communication state is established. It may be moved to a stroke position where one communication state is established. Further, in the first embodiment, the supply path 56 is branched into the first supply path 561 and the second supply path 562. However, the cylinder is arranged so that the supply path 56 communicates with the first cylinder 41 and the second cylinder 42. 4, a large opening may be formed so as to straddle the wall surface between the first cylinder 41 and the second cylinder 42, and the supply path 56 may be connected to this 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 arranged so that the introduction path 57 communicates with the first cylinder 41 and the second cylinder 42. A large opening may be formed so as to straddle the wall surface between 41 and the second cylinder 42, and the introduction path 57 may be connected to this opening.

[Configuration of Second Embodiment]
FIG. 5 is a schematic diagram of a motor refrigerant circulation device 1 (during normal rotation) of the second embodiment. FIG. 6 is a schematic diagram of the motor refrigerant circulation device 1 (during reverse rotation) of the second embodiment. In the motor refrigerant circulation device 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 not required, the mechanical pump 2 is spun to reduce the torque of the motor 7. The loss related to the mechanical pump 2 is reduced.

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 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 back from the path switching mechanism 3 to the air introduction path 58, the refrigerant can be prevented from leaking to the outside.

The other side of the air introduction path 58 branches into a first air introduction path 581, a second air introduction path 582, and a third air introduction path 583, and the first air introduction path 581 is connected to the first cylinder 41 and the second air introduction path 581 is connected to the second air introduction path 581. 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 the order closer to the actuator 6, and the third partition plate 543 is arranged in the longitudinal direction of the first piston 54. It is 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 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. A buffer space 413 is formed on the opposite side of the second internal space 412 of the third partition plate 543 to let air in and out to avoid locking 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. A fourth internal space 422 is formed between the fifth partition plate 552 and the sixth partition plate 553, and the operation of the piston 5 is locked on the side of the sixth partition plate 553 opposite to the fourth internal space 422. A buffer space 424 for taking in and out air is formed to avoid it.

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 are in the first communication state, the second communication state, and the later-described first communication state. The following communication states are maintained regardless of the three communication states. 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 communicates 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 passage 22 and is separated from the second air introduction passage 582 and the third air introduction passage 583. The fourth internal 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 communicates with the third air introduction path 583.

In the first communication state shown in FIG. 5, the first internal space 411 communicates the discharge passage 21 with the first supply passage 561, the second internal space 412 is separated from the discharge passage 21, and the buffer space 423 is provided with the second supply. The third internal space 421 communicates with the suction passage 22 and the second introduction passage 572, and the fourth internal space 422 communicates with the second air introduction passage 582 and is separated from the second introduction passage 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 passage 21, the second internal space 412 communicates the discharge passage 21 and the first introduction passage 571, and the buffer space 423 is supplied by the second supply. Separated from the path 562, the third internal space 421 communicates the suction path 22 and the second supply path 562 and is separated from the second introduction path 572, and the fourth internal space 422 communicates with the second introduction path 572. Separated from the second air introduction path 582, the buffer space 424 communicates with 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. Accordingly, 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 the piston 5 can be prevented from being locked. 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 air containing the vaporized oil in the motor 7 from leaking.

FIG. 7 is a schematic diagram of the path switching mechanism 3 (during normal rotation) that configures the motor coolant circulation device 1 of the second embodiment. FIG. 8 is a schematic view of the path switching mechanism 3 (during reverse rotation) that constitutes the motor coolant circulation device 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 581a of 581 is formed. In the second cylinder 42, the opening 562a of the second supply path 562, the opening 22a of the suction path 22, the opening 572a of the second introduction path 572, the opening 582a of the second air introduction path 582, and the 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 communicates 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 may be formed so as to straddle the wall surface between the first cylinder 41 and the second cylinder 42, 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 and 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 with the opening 22a and the opening 572a, the fourth internal space 422 communicates with the opening 582a, and the buffer space 424 communicates with 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 with the opening 21a and the opening 571a, and the buffer space 413 communicates with the opening 581a. Then, the buffer space 423 is separated from the opening 562a, the third internal space 421 communicates the opening 22a and the opening 562a and is separated from the opening 572a, and the fourth internal space 422 communicates with the opening 572a. In addition, the buffer space 424 is separated from the opening 582a and communicates 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, and when the temperature (T) is higher than a predetermined temperature (Tth), the piston 6 The stroke position of No. 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 the cooling of the motor 7 (rotor 72) is unnecessary, and the rotation direction signal (+θ, −θ). Regardless of this, the stroke position of the piston 5 is moved to a stroke position that will be a third communication state described later, and the mechanical pump 2 is idled.

FIG. 9 is a schematic diagram of the motor coolant circulation device 1 (in the normal rotation idling state) of the second embodiment. FIG. 10 is a schematic diagram of the motor coolant circulation device 1 (in the reverse rotation idle mode) of the second embodiment. FIG. 11 is a schematic diagram of the path switching mechanism 3 that constitutes the motor refrigerant circulation device 1 of the second embodiment, in which the solid line arrow indicates the air flow direction when the mechanical pump 2 is rotating normally, and the solid line arrow The arrow indicates the direction of air flow when the mechanical pump 2 rotates in the reverse direction.

As shown in FIGS. 9 to 11, the third communication state is similar to the first communication state, but the second introduction path 572 communicates with the third internal space 421 and the fourth internal space 422. 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 communicating state, the fifth partition Since the side surface of the fifth partition plate 552 faces the opening portion 572a in a manner that the opening portion 572a protrudes on both sides of the plate 552, the third internal space 421 and the fourth internal space 422 communicate with each other through the opening portion 572a. It is in the state of having done.

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 and the stroke position of the piston 5 forming the first communication state form the second communication state. It is located between the stroke position of the piston 5 and the piston 5. Accordingly, it is possible to avoid an increase in the stroke amount of the actuator 6.

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 will be connected to the mechanical pump 2 via. Further, the mechanical pump 2 communicates 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 line arrow), when the motor 7 and the mechanical pump 2 are rotating in the normal direction, the suction path 22 becomes negative pressure, so that the air introduction path 58 (second air). Air is introduced into the introduction path 582), and the air is sucked into the mechanical pump 2 through the fourth internal space 422, the opening 572a, the third internal space 421, and the suction path 22. At this time, since the specific gravity of air is lighter than that of the refrigerant, the air is sucked into the mechanical pump 2 with priority over 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 to rotate in the 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 supplied to the motor 7 (housing 71). And the path switching mechanism 3 are circulated.

In addition, as shown in FIGS. 10 and 11 (broken line arrow), when the motor 7 and the mechanical pump 2 are rotating in the reverse direction, 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 sucked into the mechanical pump 2 via the first internal space 411 and the discharge path 21. The air discharged from the mechanical pump 2 to the suction passage 22 passes through the third internal space 421, the opening 572a, and the fourth internal space 422 from the second air introduction passage 582 (air introduction passage 58) to the motor 7 It is discharged to (housing 71). As a result, the mechanical pump 2 starts idling 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 is exchanged with 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 in which the air is sucked by the mechanical pump 2 for a while, the inside of the mechanical pump 2 is filled with the air and the mechanical pump 2 spins idle. Become.

[Operation of Second Embodiment]
When the temperature (T) is higher than the predetermined temperature (Tth), the actuator 6 determines the stroke position of the piston 5 based on the rotation direction signal (+θ, −θ) to form the first communication state. Alternatively, it is moved 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 in the normal direction, 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. The refrigerant discharged from the mechanical pump 2 to the discharge path 21 is supplied to the motor 7 (rotor 72) via the first internal 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 reversely rotates, 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 passes 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 internal space 421 and the second supply path 562 (supply path 56).

As described above, also in the second embodiment, regardless of the rotation directions of the motor 7 (rotor 72) and the mechanical pump 2, the refrigerant stored in the tank 711 passes through the path switching mechanism 3 to the motor 7 (rotor 72) and the refrigerant can be circulated reliably.

On the other hand, when the temperature (T) becomes lower than the predetermined temperature (Tth), the actuator 6 changes the stroke position of the piston 5 to the stroke position where the third communication state is established as shown in FIGS. 9 to 11. It is moved and the mechanical pump 2 is spun.

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

After that, when the temperature (T) becomes equal to or higher than the predetermined temperature (Tth), the actuator 6 moves the piston 5 to the stroke position that forms the first communication state based on the rotation direction signal (+θ, −θ). , Or to the stroke position forming the second communication state, and the circulation of the refrigerant to the motor 7 (rotor 72) is restarted.

[Effects of Second Embodiment]
In the motor refrigerant circulation device 1 of the second embodiment, the air introduction path 58 for introducing air is connected to the cylinder 4, and the partition plate (fifth partition plate 552) is located at a position where the first communication state is formed. At a position between the position forming the second communication state and the position forming the second communication state, the discharge path 21 is communicated 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 in which an internal space communicating with 58 is formed. Then, the actuator 6 moves the piston 5 so as to be in the third communication state when the temperature of the refrigerant becomes lower than the predetermined temperature.

With the above configuration, when cooling of the motor 7 (rotor 72) is not necessary, the loss of torque (output) of the motor 7 due to rotation of the mechanical pump 2 is reduced by supplying air to the mechanical pump 2 to idle it. can do. Moreover, 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, it is necessary to increase the stroke length of the piston 5. The load on the actuator 6 can be avoided.

The cylinder 4 is connected to 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 communicating with the discharge path 21 and separated from the suction path 22. 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) communicate with and are separated from the discharge path 21. And a second cylinder 42 that operates.

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

The partition plate includes a first partition plate 541, a second partition plate 542, and a third partition plate 543 that are mounted side by side on the first piston 54, and a fourth partition plate 551 that is mounted side by side on the second piston 55. A fifth partition plate 552 and a sixth partition plate 553 are provided.
It

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 that communicates with the first supply path 561 and the second partition plate 542 and the third partition plate 543. And a second internal space 412 that is formed therebetween and communicates with the first introduction path 571.

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

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 with the suction path 22 and the second introduction path 572.

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

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 communicates with the second. The third internal space 421 and the fourth internal space 422 communicate with each other via the second introduction path 572 (opening 572a), which communicates with the air introduction path 582 (air introduction path 58).

With 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 that the path switching mechanism 3 can be downsized.

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 both surfaces of the fifth partition plate 552 are in the third communication state. The third internal space 421 and the fourth internal space 422 communicate with each other through the opening 572a because the side surface of the fifth partition plate 552 faces the opening 572a with the opening 572a protruding to the side. This allows the third internal space 421 and the fourth internal space 422 to communicate with each other in the third communication state with a simple configuration.

The actuator 6 may temporarily return to the first communication state or the second communication state according to the rotation direction of the motor 7 at predetermined intervals while the internal space of the cylinder 4 is in the third communication state. As a result, the coolant can be temporarily supplied to the inside of the mechanical pump 2 to prevent wear due to insufficient lubrication of the mechanical pump 2.

The air introduction path 58 communicates with the housing 71 of the motor 7. Thereby, even if the refrigerant flows back from the path switching mechanism 3 to the air introduction path 58, the refrigerant can be prevented 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 formed. 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 (the same applies to the first embodiment), the piston 5 is extended from the actuator 6 to form a first communication state, and conversely, the piston 5 is retracted to form a second communication state. However, for example, the attachment 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, and the first partition plate 541 to the seventh partition plate The mounting positions of 554 (the first partition plate 511 to the fifth partition plate 523 of the first embodiment) are also reversed in the longitudinal direction of the piston 5. As a result, it is possible to form the second communication state by feeding the piston 5 out of the actuator 6 and conversely to form the first communication state by retracting the piston 5.

[Third Embodiment]
FIG. 12 is a schematic diagram of a motor coolant circulation device 1 (in the normal rotation idling state) of the third embodiment. FIG. 13 is a schematic diagram of the motor coolant circulation device 1 (in the reverse rotation idle mode) of the third embodiment.

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

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

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 are normally rotated, the suction path 22 becomes negative pressure, and thus 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 reaches the mechanical pump 2 via the suction path 22 communicating 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 passes through the first supply path 561 (supply path 56) communicating with the first cylinder 41 and the motor 7 ( It is discharged to the housing 71). As a result, the mechanical pump 2 idles in the 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 exchanged with the motor 7 (housing 71). It circulates with the path switching mechanism 3.

Further, when the air circulation is performed as described above, the air discharged to the first cylinder 41 may flow to the first air introduction path 581. In this case, the air is introduced into the second cylinder 42 via the second air introduction path 582, which is introduced into the suction path 22 communicating with the second cylinder 42, and the air is supplied to the mechanical pump 2, the first cylinder 41, A circulation path that circulates in the order of the second cylinder 42 and the mechanical pump 2 is formed.

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

Further, when the air circulation is performed 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 passage 21 communicating with the first cylinder 41, and a circulation passage 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. It

In the motor refrigerant circulation device 1 of the third embodiment, the stroke amount of the actuator 6 becomes long, but the cylinder 4 can be immediately filled with air, so 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 diagram of the path switching mechanism 3 (in the normal rotation idle mode) that constitutes the motor refrigerant circulation device 1 of the fourth embodiment. FIG. 15 is a schematic diagram of the path switching mechanism 3 (when the engine is in the reverse rotation idle state) which constitutes the motor coolant circulation device 1 of the fourth embodiment. In the motor coolant circulation device 1 of the fourth embodiment, in the route switching mechanism 3 that constitutes the motor coolant circulation device 1 of the second embodiment, the opening 572a (first opening) of the second introduction route 572 is It communicates with the first cylinder 41. Further, 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) communicates with the second internal space 412, and the opening 21a (second opening) protrudes on both surface sides of the second partition plate 542. Since the side surface of the second partition plate 542 faces the opening portion 21a (second opening portion) in the aspect, the first internal space 411 and the second internal space 412 mutually face each other through the opening portion 21a (second opening portion). It is in communication.

As shown in FIG. 14, when the piston 5 is moved to a position that forms the third communication state in a state where the motor 7 and the mechanical pump 2 are normally rotated, the suction path 22 becomes a negative pressure, so that the air is introduced. Air is introduced into the fourth internal space 422 via the path 58 (second air introduction path 582), and due to the above reason, the air takes precedence over the refrigerant and passes through the opening 572a of the second introduction path 572 to the third side. 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 internal space 411, and the air is supplied to the motor via the first supply path 561 (supply path 56) communicating with the first internal space 411. 7 (housing 71) is discharged. As a result, the mechanical pump 2 idles in the 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 exchanged with the motor 7 (housing 71). It circulates with the path switching mechanism 3.

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

As shown in FIG. 15, when the piston 5 is moved to a position forming the third communication state while the motor 7 and the mechanical pump 2 are rotated in the reverse direction, the discharge passage 21 becomes a negative pressure, so that the supply passage 56 is formed. 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 being introduced into the discharge path 21.

Further, the air discharged from the mechanical pump 2 to the suction passage 22 is discharged to the third internal space 421, and the air is introduced into the fourth internal space 422 via the opening 572a of the second introduction passage 572, 4 is introduced into the second air introduction path 582 (air introduction path 58) communicating with the internal space 422 and discharged to the motor 7 (housing 71). As a result, the mechanical pump 2 spins 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 flows to the motor 7 (housing 71) and the path. It circulates with the switching mechanism 3.

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

In the motor refrigerant circulation device 1 of the fourth embodiment, since a plurality of air circulation paths can be formed without increasing the stroke amount of the actuator 6, the mechanical resistance of the output of the motor 7 can be reduced by reducing the air circulation resistance. It is possible to further reduce the loss due to the rotation of the pump 2 and reduce the load on the actuator 6.

Although the embodiment of the present invention has been described above, the above embodiment merely shows a part of the application example of the present invention, and the technical scope of the present invention is limited to the specific configuration of the above embodiment. Absent.

Claims (10)

A refrigerant circulation device for a motor that circulates and cools a refrigerant in a motor,
A mechanical pump that is mechanically connected to the motor and 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, an introduction path for introducing the refrigerant discharged from the motor, and a discharge path for circulating the refrigerant discharged from the mechanical pump during forward rotation of the motor, A suction path for circulating the refrigerant sucked by the mechanical pump during normal rotation of the motor is connected, and the discharge path and the supply path are connected regardless of the discharge pressure of the mechanical pump during normal rotation of the motor. The suction path and the introduction path communicate with each other, and the suction path and the supply path communicate with each other regardless of the discharge pressure of the mechanical pump when the motor rotates in the reverse direction and the discharge path and the introduction path communicate with each other. A refrigerant circulation device for a motor, comprising a path switching mechanism. The route switching mechanism,
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 forms an internal space that allows the discharge path and the supply path to communicate with each other and the suction path and the introduction path to communicate when the motor rotates normally. Movable to be switchable between a first communication state and a second communication state in which the suction path and the supply path are communicated with each other when the motor is rotated in the reverse direction and an internal space is formed that communicates the discharge path and the introduction path. A piston to
The refrigerant circulation for a motor according to claim 1, further comprising: an actuator that moves the piston in accordance with a rotation direction of the motor to switch the internal space of the cylinder to 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 communicating with the discharge path and separated from the suction path;
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 arranged in the first cylinder;
And a second piston arranged in the second cylinder,
The partition plate,
A first partition plate and a second partition plate mounted side by side with the first piston;
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 plate and the second partition plate and communicating with the first supply path;
A second internal space formed on the opposite side of the first internal space of the second partition plate and communicating 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 communicating 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 and the second introduction path,
In the second communication state,
The second internal space connects the discharge path and the first introduction path,
The refrigerant circulation device for a motor 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 and sucks the suction path through the introduction path at a position between a position where the first communication state is formed and a position where the second communication state is formed. Attached to the piston such that the passage can be switched to a third communication state that forms an internal space that communicates with the air introduction path,
The refrigerant circulation device for a motor according to claim 2, wherein the actuator moves the piston so as 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 communicating with the discharge path and separated from the suction path;
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 communicating with the air introduction path and separated from the discharge path. ,
The piston is
A first piston arranged in the first cylinder;
And a second piston arranged in the second cylinder,
The partition plate,
A first partition plate, a second partition plate, and a third partition plate mounted side by side with the first piston;
A fourth partition plate mounted side by side with the second piston, a fifth partition plate, and a sixth partition plate,
The first cylinder is
A first internal space formed between the first partition plate and the second partition plate and communicating with the first supply path;
A second internal space formed between the second partition plate and the third partition plate and communicating 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 communicating with the suction path;
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 and the second introduction path,
In the second communication state,
The second internal space connects the discharge path and the first introduction path,
The third internal space connects the suction path and 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 communicates with the air introduction path,
The refrigerant circulation device for a motor according to claim 4, wherein the third internal space and the fourth internal space communicate 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 manner that the first opening portion protrudes on both surface sides of the fifth partition plate, whereby the third internal space and The refrigerant circulation device for a motor according to claim 5, wherein the fourth internal spaces communicate with each other through the first opening. The first opening communicates with the first cylinder,
The diameter of the second opening portion 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 plate is the second opening part in a manner that the second opening part protrudes from both surface sides of the second partition plate. The refrigerant circulation device for a motor 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. 5. The actuator temporarily returns to the first communication state or the second communication state according to a rotation direction of the motor at predetermined time intervals while the internal space of the cylinder is in the third communication state. 7. The refrigerant circulation device for a motor according to any one of 7 above. An air introduction path for introducing air is connected to the cylinder,
In the actuator, any one of the partition plates is located on one side in the longitudinal direction of the piston with respect to each of the supply path, the discharge path, the suction path, and the respective opening portions connected to the cylinder of the air introduction path. The refrigerant circulation device for a motor according to claim 2, wherein the piston is movable so as to be positioned. The refrigerant circulation device for a motor according to claim 4, wherein the air introduction path communicates with a housing of the motor.

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