JP6552953B2 - Bypass valve and Rankine cycle device - Google Patents

Description

  The present invention relates to a bypass valve and a Rankine cycle device.

  For example, a bypass valve is known as a configuration for switching the flow path of fluid in an apparatus in which fluid flows in a pipe, such as a Rankine cycle apparatus. For example, Patent Document 1 listed below discloses a bypass valve including a spool moving in a cylinder and an electromagnetic actuator driving the spool. In this bypass valve, the output destination of the inflowing fluid is switched by moving the spool by the driving force of the electromagnetic actuator.

JP 2007-192260 A

  In the bypass valve as described in Patent Document 1 described above, even if a failure occurs in part of the bypass valve, it may be required to cause the fluid to flow out to a predetermined output destination. As a configuration for satisfying such a requirement, a strong return spring is provided on one end side of the cylinder, and even if the electromagnetic actuator fails, the spool is positioned on the other end side of the cylinder by the biasing force of the return spring. It is possible. However, in this case, since it is necessary to operate the electromagnetic actuator extra for the biasing force of the spring even under normal conditions, power consumption may increase.

  Then, an object of this invention is to provide the bypass valve and rankine cycle apparatus which can suppress power consumption, ensuring the operation | movement at the time of failure generation | occurrence | production.

  The bypass valve according to the present invention moves in a cylinder in a predetermined direction, and switches a connection destination of the input side flow path between the first output side flow path and the second output side flow path, and a predetermined direction in the cylinder. A return spring for biasing the spool toward the other end, a first flow path connected to the input flow path and one end of the cylinder, a second output flow path and one end of the cylinder The second flow path connected to the side, the input flow path, the third flow path connected to the other end of the cylinder, the second output flow path, and the fourth flow path connected to the other end of the cylinder And first to fourth solenoid valves provided in each of the first to fourth flow paths.

  In this bypass valve, by opening and closing the first to fourth solenoid valves, the relatively high pressure fluid flowing in the input side flow passage and the relatively low pressure fluid flowing in the second output side flow passage are divided into the first to fourth passage Can selectively flow into the Thereby, a pressure difference can be generated between one end side and the other end side of the cylinder, and the spool can be positioned on one end side or the other end side of the cylinder. Thus, by using the pressure difference between the input side and the output side as the operating force of the spool, it is possible to suppress power consumption. Further, in this bypass valve, the first to fourth flow paths and the first to fourth solenoid valves are independent on one end side and the other end side of the cylinder, and the spool is biased toward the other end side. A return spring is provided. As a result, even when problems occur, for example, when the first to fourth flow paths are clogged or the first to fourth solenoid valves fail, the spool of the cylinder can be used by utilizing the biasing force of the return spring. It can be positioned reliably on the end side. Therefore, according to this bypass valve, it is possible to suppress the power consumption while securing the operation at the time of occurrence of the failure.

  Further, the bypass valve of the present invention further includes a control unit that controls the opening and closing of the first to fourth solenoid valves, and the control unit is configured to connect the input side flow passage and the first output side flow passage with each other. When the first solenoid valve and the fourth solenoid valve are closed, the second solenoid valve and the third solenoid valve are opened, and the input side flow path and the second output side flow path are connected to each other, the first solenoid valve and the fourth solenoid valve The solenoid valve may be opened and the second solenoid valve and the third solenoid valve may be closed. According to this configuration, the connection destination of the input flow passage can be suitably switched between the first output flow passage and the second output flow passage, and the biasing force of the return spring can be used even when a failure occurs. The spool can be reliably positioned on the other end of the cylinder by utilizing it.

  In the bypass valve of the present invention, the flow area of the input side flow path may be smaller than the flow area of the second output side flow path. According to this configuration, since the difference between the pressure of the fluid flowing in the input side flow passage and the pressure of the fluid flowing in the second output side flow passage becomes large, the pressure difference between the one end side and the other end side of the cylinder It is easy to generate.

  The Rankine cycle apparatus according to the present invention comprises an evaporator for evaporating a working medium, an expander for recovering power by expanding the working medium flowing out of the evaporator, and a condenser for condensing the working medium flowing out of the expander. The bypass valve provided between the evaporator and the expander, wherein the first output side flow path is connected to the main flow path connected to the expander, and the second output side The flow path is connected to a bypass flow path that bypasses the expander.

  In this Rankine cycle device, the supply of the working medium to the expander can be stopped by causing the working medium flowing into the bypass valve to flow out into the bypass flow path. Thus, it is possible to avoid a situation in which the working medium flows into the expander and failure or deterioration of the expander occurs, for example, when there is a problem in the expander. Further, since the bypass valve is provided, the pressure difference between the input side and the output side can be used as the operating force of the spool, and power consumption can be suppressed. Furthermore, even if a problem occurs in the bypass valve, the spool can be reliably positioned on the other end side of the cylinder by utilizing the biasing force of the return spring. Therefore, according to this Rankine cycle device, it is possible to suppress the power consumption while securing the operation at the time of occurrence of the failure.

  ADVANTAGE OF THE INVENTION According to this invention, the bypass valve and Rankine cycle apparatus which can suppress power consumption can be provided, ensuring the operation | movement at the time of malfunction occurrence.

It is a schematic block diagram of the Rankine-cycle apparatus which concerns on embodiment. It is a schematic block diagram of the bypass valve of FIG. It is a schematic block diagram of the bypass valve of FIG. It is a figure which shows the relationship between the state of the 1st-4th solenoid valve in the bypass valve of FIG. 1, and operation | movement of a spool.

  Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings. In the following description, the same or corresponding elements are denoted by the same reference numerals and redundant description will be omitted.

  The Rankine cycle device 1 shown in FIG. 1 is mounted, for example, on a vehicle and used to improve fuel consumption. As a vehicle mounted, commercial vehicles, such as a truck and a bus, are mentioned, for example. The vehicle is not particularly limited, and may be, for example, any of a large vehicle, a medium vehicle, a general passenger car, a small vehicle, and a light vehicle.

  The Rankine cycle device 1 uses, for example, waste heat of a vehicle engine as heat input, converts the heat energy of the waste heat into power, and outputs the power. The Rankine cycle apparatus 1 includes a flow path 11, and includes a pump 21, an evaporator 22, an expander 23, a condenser 24, and a bypass valve 25 on the flow path 11. The working medium M is circulated in the flow path 11. Various working media M can be used. Here, R134a which is a low boiling point medium is used.

  The pump 21 is provided between the condenser 24 and the evaporator 22, and pumps the working medium M flowing from the condenser 24 to the evaporator 22 side. The evaporator 22 is provided downstream of the pump 21 and heats and evaporates the working medium M compressed by the pump 21. The evaporator 22 heats the working medium M using, for example, the engine cooling water C as a heat source (high temperature side heat source).

  The evaporator 22 has a flow path 26 through which the engine cooling water C flows. In the evaporator 22, the working medium M is heated by heat exchange between the engine cooling water C heated by the engine and the working medium M flowing in the evaporator 22. In this example, the Rankine cycle device 1 is a heat exchanger (exhaust heat exchanger) provided across the flow path 31 through which the exhaust gas G flows, the upstream side of the evaporator 22 in the flow path 26, and the flow path 31. 27. In the heat exchanger 27, the engine cooling water C is heated by heat exchange with the exhaust gas G.

  A bypass valve 28 is provided upstream of the heat exchanger 27 in the flow path 31. The bypass valve 28 is a three-way valve having the same configuration as the bypass valve 25 described later, and selectively causes the inflowing exhaust gas G to flow out to the main flow passage 32 or the bypass flow passage 33. The main flow path 32 and the bypass flow path 33 are flow paths constituting the flow path 31, the main flow path 32 is connected to the heat exchanger 27, and the bypass flow path 33 bypasses the heat exchanger 27 and is a heat exchanger. It is connected to the downstream side of 27.

  The operation of the bypass valve 28 is controlled by the controller 5. The control unit 5 is configured by a computer including, for example, a CPU, a ROM, a RAM, and the like. For example, when the temperature of the engine cooling water C is equal to or higher than a predetermined threshold, or when the waste heat recovery process by the Rankine cycle device 1 is stopped, the control unit 5 controls the exhaust gas G flowing into the bypass valve 28 The bypass valve 28 is controlled to flow out. Thus, excessive heating of engine cooling water C can be suppressed.

  The expander 23 is provided on the downstream side of the evaporator 22. The expander 23 rotates as the working medium M expands, and outputs power. For example, a turbine or the like is used as the expander 23. For example, a generator can be connected to recover the electric output. In this case, a rectifier and an inverter are further connected to the generator. Moreover, in the expander 23, mechanical output may be collect | recovered.

  The condenser 24 is provided downstream of the expander 23, and cools and condenses the working medium M. The condenser 24 cools the working medium M using, for example, the traveling wind W when the vehicle travels as a heat source (low temperature side heat source). That is, in the condenser 24, the working medium M is cooled by heat exchange between the traveling wind W and the working medium M flowing in the condenser 24.

  The bypass valve 25 is a three-way valve provided between the evaporator 22 and the expander 23 and selectively discharges the working medium M flowing from the evaporator 22 to the main flow passage 12 or the bypass flow passage 13 described later. Let Details of the bypass valve 25 will be described later.

  The flow path 11 is configured by, for example, a pipe or the like. The flow path 11 includes a main flow path 12 connected to a pump 21, an evaporator 22, an expander 23, a condenser 24, and a bypass valve 25, and a bypass flow path 13 that bypasses the expander 23. Yes. The bypass flow passage 13 is connected to the bypass valve 25 and a portion of the main flow passage 12 between the expander 23 and the condenser 24.

  Next, the configuration of the bypass valve 25 will be described with reference to FIGS. 2 and 3. The bypass valve 25 includes a case 41 that accommodates each component.

  In the case 41, a cylinder 42, an input flow passage 43, a first output flow passage 44, and a second output flow passage 45 are provided. The cylinder 42 is, for example, a cylindrical space extending in the predetermined direction D. The input side flow path 43, the first output side flow path 44, and the second output side flow path 45 are, for example, circular flow paths. The input-side flow passage 43 is connected to the outside of the case 41 and an intermediate portion of the cylinder 42 in the predetermined direction D. The first output side flow path 44 is connected to the outside of the case 41 and one end side (the upper side in FIGS. 2 and 3) 42 a in the predetermined direction D of the cylinder 42. The second output-side flow path 45 is connected to the outside of the case 41 and the other end side (the lower side in FIGS. 2 and 3) 42 b in the predetermined direction D of the cylinder 42.

  In this example, the inner diameter d <b> 1 of the input side flow path 43 is smaller than the inner diameter d <b> 2 of the second output side flow path 45. That is, the flow passage area of the input flow passage 43 is smaller than the flow passage area of the second output flow passage 45.

  The bypass valve 25 includes a spool 46 and a return spring 47 in the cylinder 42. The spool 46 includes first and second cylindrical portions 46a and 46b corresponding to the shape of the cylinder 42, and a connecting portion 46c that extends in the predetermined direction D and connects the first and second portions 46a and 46b. doing. The connecting portion 46c is formed in a columnar shape having a smaller diameter than the first portion 46a and the second portion 46b, for example. The spool 46 moves in the cylinder 42 in a predetermined direction D. At this time, the first portion 46 a and the second portion 46 b slide on the inner surface of the cylinder 42.

  Specifically, the spool 46 moves within the cylinder 42 between a first position shown in FIG. 2 and a second position shown in FIG. When the spool 46 is located at the first position, the second output flow passage 45 is closed by the second portion 46 b, and the input flow passage 43 and the first output flow passage 44 are connected. When the spool 46 is positioned at the second position, the first output flow path 44 is closed by the first portion 46 a, and the input flow path 43 and the second output flow path 45 are connected. That is, the spool 46 moves in the cylinder 42 in the predetermined direction D, and switches the connection destination of the input side flow path 43 between the first output side flow path 44 and the second output side flow path 45. The return spring 47 is provided on the one end side 42a in the predetermined direction D in the cylinder 42, and biases the spool 46 toward the other end side 42b.

  In the case 41, the first flow path 51 connected to the input side flow path 43 and the one end side 42a of the cylinder 42, the second output side flow path 45 and the second flow path connected to the one end side 42a of the cylinder 42 52, a third flow path 53 connected to the input side flow path 43 and the other end side 42b of the cylinder 42, and a fourth flow path 54 connected to the second output side flow path 45 and the other end side 42b of the cylinder 42. Is further provided.

  A first electromagnetic valve 55 is provided in the first flow path 51, a second electromagnetic valve 56 is provided in the second flow path 52, a third electromagnetic valve 57 is provided in the third flow path 53, and a fourth The flow path 54 is provided with a fourth solenoid valve 58. Here, each of the first to fourth electromagnetic valves 55 to 58 is provided at a bent portion of the first to fourth flow paths 51 to 54. The first to fourth electromagnetic valves 55 to 58 are, for example, solenoid valves using electromagnetic force. Opening and closing of the first to fourth solenoid valves 55 to 58 are controlled by the control unit 5.

  Subsequently, the operation of the bypass valve 25 will be described with reference to FIGS. 1 to 4. In the bypass valve 25, the input side flow passage 43 is connected to the downstream side of the evaporator 22 in the main flow passage 12. The first output flow passage 44 is connected to the main flow passage 12, and the second output flow passage 45 is connected to the bypass flow passage 13. Hereinafter, the pressure of the relatively high pressure working medium M flowing through the input side flow passage 43 is P1, and the pressure of the relatively low pressure working medium M flowing through the second output side flow passage 45 is P2. The pressure P1 is always greater than the pressure P2.

  When the working medium M that has flowed into the bypass valve 25 is caused to flow out to the first output-side flow path 44 (main flow path 12), the control unit 5 puts all of the first to fourth electromagnetic valves 55 to 58 in an energized state. Thus, the first electromagnetic valve 55 and the fourth electromagnetic valve 58 are closed, and the second electromagnetic valve 56 and the third electromagnetic valve 57 are opened. Thus, the first flow path 51 and the fourth flow path 54 are closed, while the second flow path 52 and the third flow path 53 are opened, and the pressure P2 is applied from the second flow path 52 to the one end side 42a of the cylinder 42. Is supplied from the third flow path 53 to the other end side 42b. As a result, the other end side 42b of the cylinder 42 has a higher pressure than the one end side 42a, and the spool 46 is positioned at the first position on the one end side 42a (FIG. 2). In this state, the working medium M that has flowed into the input side flow path 43 flows out to the first output side flow path 44 (main flow path 12). At this time, the spool 46 receives the urging force of the return spring 47, but the force pressed toward the one end side 42a by the pressure difference in the cylinder 42 (pressure difference in the cylinder 42 (P1-P2)). Is multiplied by the area of the end face of the second portion 46b in the predetermined direction D), and is therefore positioned at the first position on the one end side 42a.

  On the other hand, when the working medium M having flowed into the bypass valve 25 is made to flow out to the second output flow path 45 (bypass flow path 13), the control unit 5 de-energizes all of the first to fourth solenoid valves 55-58. By setting the (shutdown) state, the first solenoid valve 55 and the fourth solenoid valve 58 are opened, and the second solenoid valve 56 and the third solenoid valve 57 are closed. Thereby, the second flow passage 52 and the third flow passage 53 are closed, and the first flow passage 51 and the fourth flow passage 54 are opened, and the pressure P1 from the first flow passage 51 to the one end side 42a of the cylinder 42 The working fluid M of the pressure P2 is supplied from the fourth flow passage 54 to the other end 42b. As a result, the one end 42a of the cylinder 42 has a higher pressure than the other end 42b, and the spool 46 is positioned at the second position of the other end 42b (FIG. 3). In this state, the working medium M that has flowed into the input side flow path 43 flows out to the second output side flow path 45 (bypass flow path 13). At this time, the spool 46 is also pressed toward the other end side 42 b by the urging force of the return spring 47.

  In the Rankine cycle apparatus 1, the working medium M that has flowed into the bypass valve 25 is caused to flow out into the first output side flow path 44 (main flow path 12) and flow into the expander 23 to recover power. On the other hand, for example, when there is a malfunction in the expander 23, if the working medium M is caused to flow into the expander 23, the expander 23 may break down or deteriorate. Therefore, the working medium M that has flowed into the bypass valve 25 is caused to flow out to the second output side passage 45 (bypass passage 13), and the supply of the working medium M to the expander 23 is stopped. Problems occurring in the expander 23 include a failure of a generator or an inverter for a power generation type, a failure of a power take-off shaft for a mechanical type, and the like. Further, when the evaporation in the evaporator 22 is insufficient, the liquid phase working medium M may flow into the expander 23, which may cause the expander 23 to break down or deteriorate. The supply of the working medium M to the machine 23 may be stopped.

  Furthermore, in the Rankine cycle device 1, when the malfunction of the expander 23 occurs as described above, the working fluid M that has flowed into the bypass valve 25 even if the malfunction occurs in part of the bypass valve 25. Is required to flow out to the second output flow passage 45. This is to avoid the failure or deterioration of the expander 23 caused by the working medium M flowing into the expander 23.

  In this respect, in the bypass valve 25 of the present embodiment, for example, when the first to fourth flow paths 51 to 54 are clogged, or any of the first to fourth solenoid valves 55 to 58 is broken, etc. Even when a malfunction occurs, the working medium M that has flowed in can flow out to the second output-side flow path 45. Hereinafter, this point will be described with reference to FIG. In addition, although the case where one of the 1st-4th solenoid valves 55-58 breaks down is mentioned as an example and demonstrated below, also when the clogging arises in the 1st-4th flow paths 51-54, It is similar to the case where the solenoid valve is broken and the place to be opened is closed.

  When all of the first to fourth solenoid valves 55 to 58 operate normally, as described above, one end of the cylinder 42 has a higher pressure than the other end, and one end 42a and the other end 42b of the cylinder 42 , And the biasing force of the return spring 47, the spool 46 is positioned at the second position.

  When the first solenoid valve 55 breaks down and the place to be opened is closed, the first flow path 51 is closed, and the working medium M of the pressure P1 is transferred from the first flow path 51 to the one end 42a of the cylinder 42 Not supplied. Therefore, when the pressure at one end side 42a of the cylinder 42 becomes relatively low and becomes lowest (for example, when the first solenoid valve 55 is not open at all, or when the first flow passage 51 is completely clogged) It is also conceivable to be equal to the pressure P2 on the other end 42b. Even in such a case, since the return spring 47 is provided in the bypass valve 25, the spool 46 is positioned at the second position by the urging force of the return spring 47.

  When the second solenoid valve 56 breaks down and the place to be closed is open, the second flow path 52 is opened, and the working medium M of the pressure P2 from the second flow path 52 to the one end side 42a of the cylinder 42 Supplied. Therefore, when the pressure at one end side 42a of the cylinder 42 becomes about halfway between the pressure P1 and the pressure P2 and becomes lowest (for example, when the second solenoid valve 56 is completely opened), the pressure at the other end side 42b It is also possible to be equal to P2. Even in such a case, since the return valve 47 is provided in the bypass valve 25, the spool 46 is positioned at the second position by the pressure difference in the cylinder 42 and the biasing force of the return spring 47.

  When the third solenoid valve 57 breaks down and the place to be closed is open, the third flow path 53 is opened, and the working medium M of the pressure P1 from the third flow path 53 to the other end 42 b of the cylinder 42 Is supplied. Therefore, when the pressure at the other end 42b of the cylinder 42 becomes about halfway between the pressure P1 and the pressure P2 and becomes the highest (when the third solenoid valve 57 is completely open, etc.), the pressure at the one end 42a It is also possible to be equal to P1. Even in such a case, since the return valve 47 is provided in the bypass valve 25, the spool 46 is positioned at the second position by the pressure difference in the cylinder 42 and the biasing force of the return spring 47.

  When the fourth solenoid valve 58 fails and the place to be opened is closed, the fourth flow path 54 is closed, and the working medium M having the pressure P2 is transferred from the fourth flow path 54 to the other end side 42b of the cylinder 42. Is not supplied. Therefore, when the pressure at the other end side 42b of the cylinder 42 becomes relatively high and becomes the highest (when the fourth solenoid valve 58 is not open at all, the fourth channel 54 is completely clogged, etc.) Is considered to be equal to the pressure P1 at one end 42a. Even in such a case, since the return spring 47 is provided in the bypass valve 25, the spool 46 is positioned at the second position by the urging force of the return spring 47.

  As described above, in the bypass valve 25, the relatively high pressure (pressure P1) working medium M and the second output side flow path that flow through the input side flow path 43 by opening and closing the first to fourth electromagnetic valves 55 to 58. The working medium M of relatively low pressure (pressure P2) flowing through 45 can be selectively introduced into the first to fourth flow paths 51 to 54. As a result, a pressure difference is generated between one end 42a and the other end 42b of the cylinder 42, and the spool 46 is positioned at one end 42a (first position) or the other end 42b (second position) of the cylinder 42. be able to. Thus, by utilizing the pressure difference between the input side and the output side as the operating force of the spool 46, it is possible to suppress power consumption.

  Furthermore, in the bypass valve 25, the first to fourth flow paths 51 to 54 and the first to fourth solenoid valves 55 to 58 are independent at the one end 42 a and the other end 42 b of the cylinder 42, and the spool 46 Is biased toward the other end 42b. Thus, even when problems occur, for example, when the first to fourth flow paths 51 to 54 are clogged or the first to fourth solenoid valves 55 to 58 fail, the biasing force of the return spring 47 is used. Thus, the spool 46 can be reliably positioned on the other end 42 b of the cylinder 42. Therefore, according to the bypass valve 25, it is possible to suppress the power consumption while securing the operation at the time of occurrence of the failure.

  In the bypass valve 25, when the input side flow path 43 and the first output side flow path 44 are connected to each other, the control unit 5 closes the first electromagnetic valve 55 and the fourth electromagnetic valve 58, and closes the second electromagnetic valve. When the valve 56 and the third electromagnetic valve 57 are opened and the input side flow path 43 and the second output side flow path 45 are connected to each other, the first electromagnetic valve 55 and the fourth electromagnetic valve 58 are opened and the second electromagnetic valve is opened. The valve 56 and the third solenoid valve 57 are closed. As a result, the connection destination of the input side flow path 43 can be suitably switched between the first output side flow path 44 and the second output side flow path 45, and the biasing force of the return spring 47 even when a failure occurs. Can be used to reliably position the spool 46 on the other end 42 b of the cylinder 42.

  In the bypass valve 25, the flow area of the input side flow path 43 is smaller than the flow area of the second output side flow path 45. As a result, the difference between the pressure P1 of the working medium M flowing through the input-side flow path 43 and the pressure P2 of the working medium M flowing through the second output-side flow path 45 increases, so that a pressure difference is easily generated in the cylinder 42. Become.

  In the Rankine cycle device 1, the supply of the working medium M to the expander 23 can be stopped by causing the working medium M that has flowed into the bypass valve 25 to flow out to the bypass flow path 13. Accordingly, it is possible to avoid the situation where the working medium M flows into the expander 23 and the expander 23 is broken or deteriorated, for example, when the expander 23 has a problem. Further, since the bypass valve 25 is provided, the pressure difference between the input side and the output side can be used as the operation force of the spool 46, and power consumption can be suppressed. Furthermore, even when a malfunction occurs in the bypass valve 25, the spool 46 can be reliably positioned on the other end side 42b of the cylinder 42 by using the biasing force of the return spring 47. Therefore, according to the Rankine-cycle apparatus 1, power consumption can be suppressed, ensuring the operation | movement at the time of failure generation | occurrence | production.

  As mentioned above, although the suitable embodiment of the present invention was described, the present invention is not limited to the above-mentioned embodiment.

  For example, in the above embodiment, the first electromagnetic valve 55 and the fourth electromagnetic valve 58 may be configured integrally, and similarly, the second electromagnetic valve 56 and the third electromagnetic valve 57 are configured integrally. May be. Further, all of the first to fourth solenoid valves 55 to 58 may be integrally configured. The evaporator 22 may heat the working medium M using EGR gas, and the heat exchanger 27, the bypass valve 28, and the flow path 31 may not be provided. The flow area of the input side flow path 43 may be equal to or smaller than the flow area of the second output side flow path 45. The control unit that controls the bypass valve 25 and the control unit that controls the bypass valve 28 may be separate. In addition, the bypass valve of the present invention may be used to switch the fluid flow path in devices other than the Rankine cycle device 1, and may be applied to, for example, a hydraulic circuit or the like.

DESCRIPTION OF SYMBOLS 1 ... Rankine cycle apparatus, 5 ... Control part, 12 ... Main flow path, 13 ... Bypass flow path, 22 ... Evaporator, 23 ... Expansion machine, 24 ... Condenser, 25, 28 ... Bypass valve, 42 ... Cylinder, 42a ... One end side of cylinder, 42b ... Other end side of cylinder, 43 ... Input side flow path, 44 ... First output side flow path, 45 ... Second output side flow path, 46 ... Spool, 47 ... Return spring, 51- 54: first to fourth flow paths, 55 to 58: first to fourth solenoid valves, D: predetermined direction, M: working medium.

Claims (4)

A spool that moves in a cylinder in a predetermined direction and switches the connection destination of the input flow passage between the first output flow passage and the second output flow passage;
A return spring provided on one end side in the predetermined direction in the cylinder and biasing the spool toward the other end side;
A first flow path connected to the input side flow path and the one end side of the cylinder; a second output side flow path; a second flow path connected to the one end side of the cylinder; the input side flow path; A third flow passage connected to the other end of the cylinder, and a fourth flow passage connected to the second output flow passage and the other end of the cylinder;
A bypass valve comprising: first to fourth electromagnetic valves provided in each of the first to fourth flow paths. It further comprises a control unit that controls the opening and closing of the first to fourth solenoid valves,
The control unit closes the first solenoid valve and the fourth solenoid valve when the input side channel and the first output side channel are connected to each other, and the second solenoid valve and the third solenoid are closed. Open the valve,
When the input flow passage and the second output flow passage are connected to each other, the first solenoid valve and the fourth solenoid valve are opened, and the second solenoid valve and the third solenoid valve are closed. The bypass valve according to claim 1.   The bypass valve according to claim 1 or 2, wherein a flow path area of the input side flow path is smaller than a flow path area of the second output side flow path. An evaporator for evaporating the working medium; an expander for recovering power by expanding the working medium flowing out of the evaporator; a condenser for condensing the working medium flowing out of the expander; and the evaporator And the bypass valve according to any one of claims 1 to 3 provided between the expander and the expander,
In the bypass valve,
The first output side flow path is connected to a main flow path connected to the expander,
The second output side flow path is a Rankine cycle device connected to a bypass flow path that bypasses the expander.

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