JP7361177B1 - Vehicle temperature control system and temperature control method - Google Patents

Abstract

The present invention relates to an improvement of a system that includes a first circuit and a second circuit that can be separated as heat medium circuits, and also includes a mechanism that can respond to changes in volume due to changes in temperature of the heat medium. [Solution] The heat medium circuit can connect the high pressure side heat exchanger, the low pressure side heat exchanger, the outdoor heat exchanger, the temperature control device, and the suction parts of the first pump and the second pump. A connection that provides the configured reserve tank, the first pump, and the second pump with either a one-way connected state in which one is connected or a both-connected state in which both are connected. and a valve. The heat medium circuit is configured such that a first circuit including a low-pressure side heat exchanger and corresponding to the first pump and a second circuit including a high-pressure side heat exchanger and corresponding to the second pump can be set in parallel. The pump includes a low-pressure side heat exchanger and a high-pressure side heat exchanger arranged in series, and is configured to be able to set a series circuit corresponding to the first pump and the second pump. [Selection diagram] Figure 1

Description

The present disclosure relates to a temperature control system installed in a vehicle and a temperature control method using the same.

Vehicles such as electric vehicles and so-called hybrid vehicles that obtain driving power from engines and electric motors tend to lack heat sources, but in addition to air conditioning functions required for vehicles such as heating, cooling, dehumidification, and ventilation, Thermal management and waste heat utilization of in-vehicle equipment such as batteries is required. In order to meet these demands, in addition to heat pump systems, conventional systems include systems that include a chiller to cool the battery and a heater to warm the battery, or a system that uses a pump to transport water heated by the exhaust heat of a radiator to the temperature controlled target. A number of systems have been used, such as the

As a thermal management system for a vehicle, a system has been proposed that includes a primary loop in which a refrigerant circulates according to a refrigeration cycle, and a secondary loop in which a heat medium (water, etc.) is conveyed to an indoor air conditioning unit by a pump (for example, Patent Documents 1, 2).

The system described in Patent Document 1 discloses cooling electrical components and batteries using cooling water. Such a system includes a reserve tank that stores cooling water cooled by a radiator, a radiator and a reserve tank, and a cooling water line through which the cooling water supplied from the reserve tank to the electrical equipment circulates, and the same reserve tank. and another cooling water line through which the cooling water supplied from the reserve tank to the battery circulates. Each cooling water line is provided with a pump and a valve, and depending on whether the valve is opened or closed, either or both of the electrical components and the battery are cooled.
Note that the reserve tank has a function of accepting surplus heat medium when the volume of the heat medium increases due to a rise in temperature, and replenishing the heat medium into the piping when the temperature drops.

Moreover, the system described in Patent Document 2 discloses a configuration in which a heat medium can be supplied to a plurality of devices. Such a system includes a cold water circuit including a cooler core and a first pump, a hot water circuit including a heater core and a second pump, and a first switching valve and a second switching valve. Connected to the hot water circuit is a closed reserve tank that stores the heat medium and maintains the pressure of the heat medium within an appropriate range.

JP2021-37931A Patent No. 6064753

In the system described in Patent Document 1, a cooling water line including a radiator and other cooling water lines pass through the same reserve tank. Therefore, if the system is operated with both lines connected and a cooling water route that includes both lines set, the cooling water flowing through the route will follow its original route beyond the reserve tank. Instead of flowing, it flows in a short path through the tank. In other words, the cooling water flows through the reserve tank through a path with smaller pressure loss than the original path.

Furthermore, although the hot water circuit of the system described in Patent Document 2 is provided with a sealed reserve tank, the cold water circuit is not provided with a reserve tank. Therefore, when the system is operated with the hot water circuit and the cold water circuit separated, the pressure in the piping of the cold water circuit increases as the temperature of the heat medium in the cold water circuit increases. To avoid this, it is difficult to install a reserve tank in the chilled water circuit, considering the increased cost, the larger system, and the possibility of air being mixed in due to the imbalance in the amount of liquid stored in the two reserve tanks. .

As described above, the present disclosure relates to a system that includes a first circuit and a second circuit that are separable as heat medium circuits, and also includes a mechanism that can respond to changes in volume due to changes in temperature of the heat medium. The present disclosure makes it possible to ensure necessary performance by allowing the heat medium to flow through a predetermined path even when the first circuit and the second circuit are continuous, and furthermore, the first circuit and the second circuit are It is an object of the present invention to provide a temperature control system and a temperature control method for a vehicle that can avoid excessive pipe internal pressure even if the pipes are divided.

The present disclosure is a temperature control system for a vehicle, and includes a refrigerant circuit that includes a compressor, a high-pressure side heat exchanger, a pressure reduction section, and a low-pressure side heat exchanger, and is configured to allow refrigerant to circulate according to a refrigeration cycle; A heat medium circuit configured to allow circulation of a heat medium that transfers heat to and receives heat from the refrigerant.
The heat medium circuit includes a high pressure side heat exchanger that exchanges heat between the refrigerant and the heat medium, a low pressure side heat exchanger that exchanges heat between the refrigerant and the heat medium, a first pump configured to be able to pump the heat medium, and A second pump, an outdoor heat exchanger that exchanges heat between outside air and a heat medium, and a temperature control device that corresponds to a temperature control object heated or cooled by the heat medium or is used for heating or cooling a temperature control object. , a reserve tank capable of storing a heat medium and configured to be connected to the suction parts of the first pump and the second pump, and a state in which the first pump and the second pump are connected to the reserve tank. , a connection valve configured to be able to provide either a one-way connection state in which one side is connected or a both-way connection state in which both sides are connected.
The heat medium circuit is configured such that a first circuit including a low-pressure side heat exchanger and corresponding to the first pump and a second circuit including a high-pressure side heat exchanger and corresponding to the second pump can be set in parallel. The pump includes a low-pressure side heat exchanger and a high-pressure side heat exchanger arranged in series, and is configured to be able to set a series circuit corresponding to the first pump and the second pump.

Further, the present disclosure can be applied to a temperature control method for a vehicle.

Depending on the configuration of the circuit set in the heat medium circuit, the connection state of the suction parts of the first and second pumps to the reserve tank is a one-way connection state in which only one of the first and second pumps is connected; It is possible to select either a both-connected state in which both are connected, or a both-connected state using a connecting valve. In this case, even if the first circuit and the second circuit as heat medium circuits are separated, the internal pressure of the heat medium piping may become excessive or negative in both the first and second circuits. Pressure can be avoided. Furthermore, even if a series circuit is used, which corresponds to a state in which the first circuit and the second circuit are connected, the heat medium can flow through the path that communicates the suction parts of the first and second pumps with the reserve tank. The necessary capacity can be ensured by avoiding the occurrence of a flow that bypasses the heat exchanger.

It is a circuit diagram showing a temperature control system for vehicles concerning a 1st embodiment (air conditioning mode). FIG. 2 is a diagram showing an operating state of the system shown in FIG. 1 in a heat pump mode. FIG. 2 is a diagram showing an operating state of the system shown in FIG. 1 in a heater mode. It is a circuit diagram showing a temperature control system for vehicles concerning a 1st modification of a 1st embodiment (heater mode). It is a circuit diagram showing a temperature control system for vehicles concerning a 2nd modification of a 1st embodiment (heater mode). It is a circuit diagram showing a temperature control system for vehicles concerning a 3rd modification of a 1st embodiment (heater mode). It is a circuit diagram showing a temperature control system for vehicles concerning a 4th modification of a 1st embodiment (heater mode). It is a circuit diagram showing a temperature control system for vehicles concerning a 5th modification of a 1st embodiment (dehumidification heating). FIG. 2 is a circuit diagram showing a vehicle temperature control system according to a second embodiment (cooling mode). 10 is a diagram showing the operating state of the system shown in FIG. 9 when the pump fails (cooling mode); FIG.

Hereinafter, one embodiment of the present disclosure will be described with reference to the accompanying drawings.
[First embodiment]
The temperature control system 1 for a vehicle shown in FIG. 1 is applicable, for example, to an electric vehicle that does not have an engine and obtains driving force for running the vehicle from an electric motor for running, or for an electric vehicle that does not have an engine and receives driving force for running the vehicle from an engine and an electric motor. It is equipped on a vehicle (not shown) such as a so-called hybrid vehicle. The temperature control system 1 includes air conditioning such as heating and cooling, dehumidification, ventilation, etc. for the passenger compartment 8 in which passengers board, as well as in-vehicle devices such as a battery device (power supply device), a driving motor, and electronic devices that generate heat. Responsible for heat management, waste heat recovery, etc. The general term ``thermal management'' refers to air conditioning to the appropriate temperature and humidity, and controlling in-vehicle equipment to an appropriate temperature.
Electric power stored in an on-vehicle battery device is supplied to the temperature control system 1 and electric devices and electronic devices included in the on-vehicle device. An on-vehicle battery device is charged from an external power source when the vehicle is stopped.

〔overall structure〕
The temperature control system 1 includes a refrigerant circuit 10 configured to allow circulation of a refrigerant, a heat medium circuit 20 configured to allow circulation of a heat medium that transfers heat to and from the refrigerant, and a temperature control system 1 configured to operate the temperature control system 1 in a predetermined manner. mode, and a control device 5 that controls the operating state of the temperature control system 1 according to the operating mode.
The temperature control system 1 also includes sensors (not shown) such as a sensor that detects the outside temperature, a sensor that detects the temperature of the conditioned air blown into the vehicle interior 8, and the like.

The temperature control system 1 includes a plurality of operation modes selected by a passenger or by the control device 5. This embodiment exemplifies a cooling mode (FIG. 1), a heat pump mode (FIG. 2), and a heater mode (FIG. 3) as operating modes of the temperature control system 1.

[Refrigerant circuit configuration]
The refrigerant circuit 10 includes a compressor 11, a condenser 12, an expansion valve 13, and an evaporator 14, as an example of the configuration is shown in FIG. Refrigerant circulates in the refrigerant circuit 10 according to a refrigeration cycle.
As the refrigerant sealed in the refrigerant circuit 10, any known appropriate single refrigerant or mixed refrigerant can be used. For example, as the refrigerant of this embodiment, HFC (Hydro Fluoro Carbon) refrigerants such as R410A and R32, HFO (Hydro Fluoro Olefin) refrigerants such as R1234ze and R1234yf, or hydrocarbon (HC) refrigerants such as propane and isobutane are used. It is possible to use In particular, it is preferable to use R1234yf as the refrigerant in this embodiment.

When using the fluorocarbon-based or hydrocarbon-based refrigerants listed above, a subcritical refrigeration cycle is constructed in which the refrigerant pressure on the high-pressure side does not exceed the critical pressure of the refrigerant.
When carbon dioxide (CO ₂ ) is used as the refrigerant, a transcritical refrigeration cycle is configured in which the refrigerant pressure on the high pressure side exceeds the critical pressure of the refrigerant. Even in that case, the refrigerant can radiate heat by the high-pressure side heat exchanger like the condenser 12 of this embodiment, and the refrigerant can absorb heat by the low-pressure side heat exchanger like the evaporator 14 of this embodiment. A refrigerant constituting a transcritical refrigeration cycle, such as carbon dioxide refrigerant, can also be employed in the refrigerant circuit 10.

The compressor 11 corresponds to an electric compressor equipped with a motor (not shown). The compressor 11 uses a compression mechanism to adiabatically compress refrigerant sucked into a housing (not shown) and then discharges the refrigerant.

The condenser 12 exchanges heat between the refrigerant gas discharged from the compressor 11 and a heat medium.
The expansion valve 13 (pressure reducing section) reduces the pressure of the refrigerant flowing out from the condenser 12 to adiabatically expand the refrigerant. As the expansion valve 13, in addition to an electronic expansion valve whose opening degree can be controlled based on a command from the control device 5, a temperature-type expansion valve can be adopted. Alternatively, a capillary tube can be used instead of the expansion valve 13.

The evaporator 14 causes the refrigerant flowing out from the expansion valve 13 to exchange heat with a heat medium. The refrigerant evaporated by the evaporator 14 is sucked into the compressor 11.
An accumulator (gas-liquid separator), not shown, can be provided between the evaporator 14 and the compressor 11.

A relatively high refrigerant pressure (high pressure) is applied to the condenser 12, and a relatively low refrigerant pressure (low pressure) is applied to the evaporator 14. The refrigerant circulates through the refrigerant circuit 10 based on the pressure difference between high pressure and low pressure.
In FIG. 1, the flow of refrigerant on the low pressure side is shown by a thick solid line, and the flow of refrigerant on the high pressure side is shown by a thick broken line. The same applies to other figures.

The compressor 11, condenser 12, expansion valve 13, evaporator 14, and refrigerant piping connecting these elements can be installed outside the compartment 8.

[Configuration of heat medium circuit]
The heat medium circuit 20 is configured such that a heat medium capable of exchanging heat with a refrigerant can be circulated through the condenser 12 and the evaporator 14 . The heat medium is used for cooling or heating at least one temperature-controlled object. The temperature control target in this embodiment corresponds to the air inside the vehicle compartment 8.
The heat medium sealed in the heat medium circuit 20 is a liquid such as water or brine that circulates through the heat medium circuit 20 while maintaining a liquid phase state. Examples of the brine include a mixture of water and propylene glycol, or a mixture of water and ethylene glycol.

As an example of the configuration is shown in FIG. 1, the heat medium circuit 20 includes a condenser 12, an evaporator 14, a first pump 21 and a second pump 22, an outdoor heat exchanger 23, and an outdoor bypass path 24. , an indoor heat exchanger 25, a reserve tank 27, an on-off valve 28, and a first switching valve 31, a second switching valve 32, and a third switching valve 33 as a plurality of flow path switching valves.

In the example shown in FIGS. 1 and 2, the entire amount of the heat medium flowing from the first switching valve 31 toward the condenser 12 does not flow into the condenser bypass path 12A due to the flow rate adjustment by the condenser flow rate adjustment valve 12V. flows into the condenser 12. Further, by adjusting the flow rate by the evaporator flow rate adjustment valve 14V, the entire amount of the heat medium flowing from the first switching valve 31 toward the evaporator 14 flows into the evaporator 14 without flowing into the evaporator bypass path 14A. .

Both the first pump 21 and the second pump 22 correspond to electric pumps driven by a motor (not shown). The first pump 21 pumps the heat medium by sucking in and discharging the heat medium flowing out from at least one of the evaporator 14 and the evaporator bypass path 14A. The second pump 22 pumps the heat medium by sucking in and discharging the heat medium flowing out from at least one of the condenser 12 and the condenser bypass path 12A.

The outdoor heat exchanger 23 exchanges heat between the outside air outside the vehicle compartment 8 and the heat medium. The outdoor heat exchanger 23 corresponds to, for example, a radiator placed near an air inlet of a vehicle. The outside air supplied to the outdoor heat exchanger 23 due to the running of the vehicle and the operation of the outdoor blower 23A radiates or absorbs heat based on the temperature difference between the outside air and the heat medium.

The indoor heat exchanger 25 provides conditioned air into the vehicle interior 8 by exchanging heat between the air sent by the indoor blower 25A and a heat medium. The indoor blower 25A is driven by a motor and blows air (inside air) in the vehicle interior 8, outside air, or a mixed gas of inside air and outside air toward the indoor heat exchanger 25.
The HVAC (Heating, Ventilation, and Air Conditioning) unit U includes an indoor heat exchanger 25, an indoor blower 25A, and a duct (not shown) through which air sent by the indoor blower 25A flows.

Preferably, the heat medium circuit 20 includes an indoor bypass path 26 that detours the heat medium from the indoor heat exchanger 25.
When the temperature control system 1 is equipped with in-vehicle equipment such as a battery device 6 (FIG. 8) as a temperature control target, and when the vehicle interior 8 is not air-conditioned, the temperature control system 1 is detoured from the indoor heat exchanger 25 through the indoor bypass path 26. The heated heat medium can be supplied to the battery device 6.

Each element of the heat medium circuit 20 except the indoor heat exchanger 25, that is, the condenser 12, the evaporator 14, the first pump 21, the second pump 22, the outdoor heat exchanger 23, the outdoor bypass path 24, and the first to The third switching valves 31 to 33 can be installed outside the vehicle compartment 8.

The reserve tank 27 is open to the atmosphere through an atmosphere opening (not shown), and stores the heat medium in and out. This reserve tank 27 corresponds to a mechanism capable of responding to volume changes due to temperature changes of the heat medium, and also maintains the suction portion of at least one of the first pump 21 and the second pump 22 connected to atmospheric pressure. play the role of maintaining The heat medium circuit 20 is provided with only one reserve tank 27.

When the heat medium enclosed in the heat medium circuit 20 expands as the temperature rises, the reserve tank 27 receives the heat medium that exceeds the volume of the piping of the heat medium circuit 20 inside the tank. Furthermore, when the volume of the heat medium decreases due to a decrease in temperature, the heat medium is replenished from the reserve tank 27 to the piping of the heat medium circuit 20, so that the inside of the pipe is maintained filled with the heat medium. . In other words, the reserve tank 27 can prevent the internal pressure of the piping from becoming excessive or the inside of the piping from becoming negative pressure. In order to obtain this effect, it is sufficient that the reserve tank 27 is connected to at least one location of the heat medium circuit 20.

The reserve tank 27 is configured to be connectable to both the suction portion 21A of the first pump 21 and the suction portion 22A of the second pump 22, either directly or via a communication pipe 403 or the like. The reserve tank 27 of this embodiment is arranged near the suction parts 21A, 22A of the pumps 21, 22, which are arranged close to each other.

Note that the evaporator 14 and the condenser 12 should be arranged symmetrically, taking into account ease of assembly of the members of the refrigerant circuit 10 and the heat medium circuit 20, fitting of the members in the installation space of the temperature control system 1, etc. is preferred. Following the evaporator 14 and condenser 12, the first pump 21 and the second pump 22 are also preferably arranged symmetrically and close to each other.

A liquid inlet/outlet 27A of the reserve tank 27 is connected to a communication pipe 403 that connects a pipe 401 between the evaporator 14 and the first pump 21 and a pipe 402 between the condenser 12 and the second pump 22. There is. The liquid inlet/outlet 27A is normally provided at the bottom of the reserve tank 27. An air opening (not shown) is formed above the maximum liquid level in the reserve tank 27, usually at the top of the reserve tank 27.

In this embodiment, the suction portion 21A of the first pump 21 is connected to the reserve tank 27 through the communication pipe 403 regardless of the operation mode. On the other hand, the suction portion 22A of the second pump 22 opens the on-off valve 28 provided in the communication pipe 403 only in a predetermined mode (M1, M2) based on the circuit configuration set in the heat medium circuit 20. It is connected to the reserve tank 27.

The on-off valve 28 corresponds to a solenoid valve that is opened and closed according to a control command issued by the control device 5. The on-off valve 28 of this embodiment is arranged between the reserve tank 27 and the second pump 22 in the communication pipe 403.

In the cooling mode M1 shown in FIG. 1 and the heat pump mode M2 shown in FIG. 2, the on-off valve 28 is open, so both the first pump 21 and second pump 22 are connected to the reserve tank 27 (both state S _Both ).
On the other hand, in the heater mode M3 shown in FIG. 3, the on-off valve 28 is closed, so the second pump 22 is not connected to the reserve tank 27. At this time, only the first pump 21 is connected to the reserve tank 27 (one-way connected state S _One ).

In other words, the on-off valve 28 corresponds to a connection valve that provides one connection state S _One or both connection state S _Both to the first pump 21 and the second pump 22 as connection states to the reserve tank 27 .
As shown in FIG. 3, the on-off valves 28 painted in black are closed. The same applies to other figures.

All of the first to third switching valves 31 to 33 are electrically operated valves that can be controlled to open and close based on commands from the control device 5, and are configured to be able to switch the heat medium flow path according to each operation mode. .
In this embodiment, the first switching valve 31 and the second switching valve 32 are four-way valves, and the third switching valve 33 corresponds to a three-way valve.
The first to third switching valves 31 to 33 can be replaced with an appropriate number of electric valves having an appropriate structure in order to set the paths necessary for realizing each operation mode in the heat medium circuit 20.

By switching the flow of the heat medium by at least one of the first to third switching valves 31, 32, and 33, the heat medium circuit 20 is configured such that the first circuit C1 and the second circuit C2 can be set in parallel. (FIG. 1 and FIG. 2), and is configured such that a series circuit CC can be set (FIG. 3).

A low-pressure side circuit C1 that flows out from the evaporator 14 and returns to the evaporator 14, and a second circuit C2 for the heat medium that flows out of the condenser 12 and returns to the condenser 12 are separated. Below, the first circuit C1 and the second circuit C2 may be referred to as parallel circuits C1 and C2.

1 and 2 showing the parallel circuits C1 and C2, the flow of a relatively low-temperature heat medium (low-temperature heat medium) pumped by the first pump 21 and circulated through the first circuit C1 is shown by a solid line; The flow of a relatively high temperature heat medium (high temperature heat medium) which is pumped by the second pump 22 and circulated through the second circuit C2 is shown by a dashed line. Paths in which neither the low-temperature heat medium nor the high-temperature heat medium is pumped (unused paths) are indicated by broken lines.

On the other hand, the series circuit CC corresponds to one continuous circuit including the evaporator 14 and the condenser 12 arranged in series. When the series circuit CC is set, for example, as shown in FIG. 3, the heat medium flowing out from the condenser 12 flows into the evaporator 14, and further flows out from the evaporator 14 into the condenser 12. At this time, the heat medium circulates through one continuous series circuit CC formed in the heat medium circuit 20, and the evaporator 14 and the condenser 12 are arranged in series with respect to the flow of the heat medium.

Also in FIG. 3 showing the series circuit CC, the flow of a relatively low-temperature heat medium is shown by a solid line, and the flow of a relatively high-temperature heat medium is shown by a dash-dotted line. Referring to FIG. 3, unlike the case where parallel circuits C1 and C2 are set, the flow of the heat medium from the evaporator 14 to the condenser 12 is shown by a solid line, and the heat medium flows from the condenser 12 to the condenser 12. However, the flow of the heat medium until it flows into the evaporator 14 is shown by a dashed-dotted line. This means that when the heat medium flows into the evaporator 14, the temperature of the heat medium decreases due to heat radiation to the refrigerant, and when the heat medium flows into the condenser 12, the temperature of the heat medium rises due to heat absorption from the refrigerant. represents something to do.

The temperature control system 1 includes a plurality of operation modes using parallel circuits C1, C2 or series circuit CC. At least in the operation mode using parallel circuits C1 and C2, both the first pump 21 and the second pump 22 are necessary. The temperature control system 1 of this embodiment operates both pumps 21 and 22 even when the series circuit CC is used. In this case, the first pump 21 and the second pump 22 are arranged in series.

[Effects of each operation mode]
Hereinafter, the effects of each operation mode of the temperature control system 1 will be explained.
Cooling mode M1 (Figure 1):
When cooling the interior of the vehicle compartment 8 in the cooling mode M1, the heat medium circuit 20 includes the evaporator 14, the first pump 21, and A first circuit C1 including an indoor heat exchanger 25 and a second circuit C2 including a condenser 12, a second pump 22, and an outdoor heat exchanger 23 are set.

The heat medium that has radiated heat to the refrigerant by the evaporator 14 is sucked in by the first pump 21 and discharged, then flows into the indoor heat exchanger 25 via the third switching valve 33 and flows into the passenger compartment 8. Cools the blown air. The heat medium flowing out of the indoor heat exchanger 25 returns to the evaporator 14 via the first switching valve 31.
On the other hand, when the heat medium that has absorbed heat from the refrigerant by the condenser 12 is sucked in by the second pump 22 and discharged, it flows into the outdoor heat exchanger 23 via the second switching valve 32 and is radiated to the outside air. Ru. The heat medium flowing out from the outdoor heat exchanger 23 returns to the condenser 12 via the first switching valve 31.

When the parallel circuits C1 and C2 are set, the on-off valve 28 is opened, thereby giving the first pump 21 and the second pump 22 a connection state S _Both .
At this time, the pressure of the heat medium in the first circuit C1 increases from the atmospheric pressure _P0 , which is the suction pressure, to the predetermined discharge pressure _P1 , due to the operation of the first pump 21. The pressure of the heat medium discharged from the first pump 21 gradually decreases due to the resistance of the piping, etc., and the flow rate increases accordingly. When the pressure of the heat medium in the first circuit C1 decreases to atmospheric pressure _P0 in the suction portion 21A of the first pump 21, it increases again to the discharge pressure _P1 due to the operation of the first pump 21.

Similar to the first circuit C1, the pressure of the heat medium in the second circuit C2 increases from atmospheric pressure _P0 , which is the suction pressure, to a predetermined discharge pressure _P2 due to the operation of the second pump 22, and then It gradually descends due to resistance. When the pressure of the heat medium decreases to atmospheric pressure P ₀ in the suction portion 21A of the second pump 22, it increases again to the discharge pressure P ₂ due to the operation of the second pump 22.

When the parallel circuits C1 and C2 are set, both the suction section 21A of the first pump 21 and the suction section 22A of the second pump 22 are maintained at atmospheric pressure. Therefore, a continuous flow of the heat medium from either end of the communication pipe 403 toward the other side does not occur.

Furthermore, even if the internal pressure of the piping changes due to a change in the temperature of the heat medium, since the divided first circuit C1 and second circuit C2 are each connected to the reserve tank 27, the heat medium It can flow into the reserve tank 27 from either the circuit C1 or the second circuit C2, and can flow out from the reserve tank 27 toward either the first circuit C1 or the second circuit C2. Therefore, the internal pressure of both the pipes of the first circuit C1 and the second circuit C2 is maintained at an appropriate value. In this case, for both the first circuit C1 and the first circuit C2, damage to piping members etc. due to excessive internal pressure in the piping, or damage to the heat medium due to air entering the piping from the joint etc. due to negative pressure in the piping. This can prevent bubbles from forming.

Heat pump mode M2 (Figure 2):
Heat pump mode M2 heats the interior of the vehicle compartment 8 by pumping heat from outside air as a heat source. In heat pump mode M2, the heat medium circuit 20 includes a first circuit C1 including an evaporator 14, a first pump 21, and an outdoor heat exchanger 23, a condenser 12, a second pump 22, and an indoor heat exchanger. A second circuit C2 including 25 is set.

When the heat medium that has radiated heat to the refrigerant by the evaporator 14 is sucked in by the first pump 21 and discharged, it absorbs heat from the outside air by the outdoor heat exchanger 23 and returns to the evaporator 14 .
On the other hand, when the heat medium that has absorbed heat from the refrigerant by the condenser 12 is sucked in by the second pump 22 and discharged, it flows into the indoor heat exchanger 25 and warms the air blown into the passenger compartment 8. . The heat medium flowing out from the indoor heat exchanger 25 returns to the condenser 12.

When the parallel circuits C1 and C2 are set, as described above, the on-off valve 28 is opened, thereby providing the first pump 21 and the second pump 22 with the connection state S _Both . In other words, since both the suction section 21A of the first pump 21 and the suction section 22A of the second pump 22 are maintained at atmospheric pressure _P0 , the continuity from either end of the communication pipe 403 to the other side is maintained. No flow of heat medium occurs.
Furthermore, since the first circuit C1 and the second circuit C2 are each connected to the reserve tank 27 based on the both connection state S _Both , the heat medium moves in and out of the reserve tank as the temperature changes. The internal pressures of the pipes in both the circuit C1 and the first circuit C2 are maintained at appropriate values.

Heater mode M3 (Figure 3):
Heater mode M3 is suitable for heating when heat cannot be absorbed from the outside air to the heat medium because the outside temperature is low. In the heater mode M3, an amount of heat corresponding to the power of the compressor 11 as a heat source is conveyed to the vehicle compartment 8 by the heat medium while avoiding heat radiation from the heat medium to the outside air. By doing so, heating capacity can be guaranteed even when the outside temperature is significantly below 0°C.

In the heater mode M3, a series circuit CC is set in the heat medium circuit 20, and the first circuit C1 and the second circuit C2 are connected without being separated. At this time, the evaporator 14 and the condenser 12 are arranged in series, and the on-off valve 28 is closed (one-way connected state S _One ).

When the heat medium that has absorbed heat from the refrigerant by the condenser 12 is sucked into the second pump 22 and discharged, it flows into the indoor heat exchanger 25 via the third switching valve 33 and is used to heat the vehicle interior 8. Served. The heat medium flowing out of the indoor heat exchanger 25 flows into the evaporator 14 via the first switching valve 31. When the heat medium that has radiated heat to the refrigerant by the evaporator 14 is sucked in by the first pump 21 and discharged, it flows from the second switching valve 32 through the outdoor bypass path 24 in order to avoid heat radiation to the outside air. The heat medium that has flowed through the outdoor bypass path 24 returns to the condenser 12.

When the series circuit CC is set, based on the connection state S _One , only the suction part 21A of the first pump 21 is connected to the reserve tank 27, and the heat medium is connected to the evaporator 14 of the heat medium circuit 20. and the condenser 12 side. In this series circuit CC, the evaporator 14 and the condenser 12 are arranged in series, and the first pump 21 and the second pump 22 are arranged in series.
Then, when the heat medium is sucked in by the first pump 21 at atmospheric pressure _P0 and discharged at a predetermined discharge pressure _P1 , the pressure decreases while flowing through the second switching valve 32 and the condenser 12. , is sucked in by the second pump 22 at a predetermined suction pressure _P3 . The heat medium discharged by the second pump 22 at a predetermined discharge pressure P ₄ passes through the third switching valve 33 , the indoor heat exchanger 25 , the first switching valve 31 , and the evaporator 14 to the atmospheric pressure P _{0 .} and is sucked into the first pump 21.

When using the series circuit CC, with the first pump 21 as a reference, a continuous flow is formed in which the heat medium discharged from the first pump 21 returns to the first pump 21 via the second pump 22. . At this time, if the on-off valve 28 is open, even if both the suction parts 21A and 22A of the first and second pumps 21 and 22 are connected to the reserve tank 27, the discharge part of the first pump 21 Since the pressure loss from the to the suction part 22A of the second pump 22 is different from the pressure loss from the discharge part of the second pump 22 to the suction part 21A of the first pump 21, the pressure of the suction part 21A of the first pump 21 is different. _P5 is different from the pressure _P6 of the suction portion 22A of the second pump 22.

In order to prevent the heat medium from moving due to such a pressure difference, only the suction portion 21A of the first pump 21, which is one of the first and second pumps 21 and 22, is connected to the reserve tank 27 by closing the on-off valve 28. There is. Then, since the first pump 21 side and the second pump 22 side are not in communication via the communication pipe 403, there is a pressure difference between the suction section 21A of the first pump 21 and the suction section 22A of the second pump 22. Even if there is, it is possible to prevent a part of the heat medium traveling from the condenser 12 to the second pump 22 from flowing out from the second pump 22 side to the first pump 21 side through the communication pipe 403.

Assuming that the on-off valve 28 is open when the series circuit CC is used, a part of the flow of the heat medium from the condenser 12 toward the second pump 22 will be routed through the communication piping where the pressure loss is smaller than the original route. It flows out to the first pump 21 side through 403. In this case, the heat medium detours from the indoor heat exchanger 25 and the evaporator 14 through the communication pipe 403 and is sucked into the first pump 21, resulting in a reduction in heating capacity.
By closing the on-off valve 28 and preventing the heat medium from bypassing the indoor heat exchanger 25 and the evaporator 14, the necessary heating capacity can be ensured.

When the on-off valve 28 is closed when the series circuit CC is set, only the suction portion 21A of the first pump 21, which is one of the first and second pumps 21 and 22, is connected to the reserve tank 27. Since the heat medium circulates through one series circuit CC, it is sufficient to connect it to the reserve tank 27 at one point on the series circuit CC. In the heater mode M3 of this embodiment, as the temperature of the heat medium changes, the heat medium may flow from the suction part 21A of the first pump 21 to the reserve tank 27, or from the reserve tank 27 to the suction part 21A of the first pump 21. The internal pressure of the piping is maintained at an appropriate value as the heat medium flows out.

Pressure drop in the path of the heat medium from being discharged from the first pump 21 to being sucked into the second pump 22; Pressure drop in the path of the heat medium from being discharged from the second pump 22 to being sucked into the first pump 21 Compared to The drop is large.
Based on this, when using the series circuit CC, among the pumps 21 and 22 arranged in series, by suppressing the pressure drop from the former pump whose suction part is exposed to the atmosphere to the latter pump, the suction part of the latter pump can be reduced. I want to avoid negative pressure. For this reason, it is preferable that the on-off valve 28 be provided closer to the second pump 22 than the reserve tank 27 in the communication pipe 403 . In this case, the front stage pump corresponds to the first pump 21 and the rear stage pump corresponds to the second pump 22.

Start-up heater mode:
The operation mode using the series circuit CC is not limited to the heater mode M3. The temperature control system 1 may include, for example, a startup heater mode (not shown) that is intended for starting the temperature control system 1 after the temperature control system 1 has been stopped for a long time when the outside temperature is low. Also in this start-up mode, the evaporator 14 and the condenser 12 are arranged in series with respect to the flow of the heat medium. Here, unlike heater mode M3, in order to give priority to heating the refrigerant over heating the interior of the vehicle compartment 8, the heat medium is not allowed to flow into the condenser 12 but is detoured to the condenser bypass path 12A. This prevents heat radiation of the refrigerant to the heat medium.

In the startup heater mode, the outdoor heat exchanger 23 causes the heat medium to absorb heat from the outside air, so that the heat medium flows into the outdoor heat exchanger 23 . Further, the heat medium flowing out from the indoor heat exchanger 25 is radiated to the refrigerant in the evaporator 14. Furthermore, in order to suppress heat exchange between the heat medium and air, it is preferable to detour the heat medium from the indoor heat exchanger 25 through the indoor bypass path 26 and to stop the operation of the indoor blower 25A.

Immediately after the temperature control system 1 is activated when the temperature of the heat medium is as low as the outside air temperature, which is significantly below 0°C, the low pressure in the refrigerant circuit 10 drops as the refrigerant cools the heat medium, and the refrigerant The evaporation temperature of will be lower than the outside temperature. However, according to the startup heater mode, by continuously transmitting the heat absorbed by the heat medium from the outside air to the refrigerant, the low pressure of the refrigerant circuit 10 is gradually increased, and the refrigerant circuit 10 is brought into steady operation quickly. It can be tightened. After starting the heater mode, it is preferable to shift to the heater mode M3.

Also in the start-up heater mode, the on-off valve 28 is closed similarly to the heater mode M3. Therefore, the internal pressure of the heat medium piping is maintained at an appropriate value, and the start-up of the refrigerant circuit 10 can be promoted by avoiding the flow of the heat medium bypassing through the communication pipe 403.

[Main effects of this embodiment]
As explained above, depending on the configuration set in the heat medium circuit 20, the connection state of the suction parts 21A, 22A of the first and second pumps 21, 22 to the reserve tank 27 can be selected by the on-off valve 28. It is. Therefore, in both the operation mode using the parallel circuits C1 and C2 and the operation mode using the series circuit CC, it is possible to avoid excessive internal pressure in the heat medium piping or negative pressure inside the piping. At the same time, when the series circuit CC is used, it is possible to avoid the occurrence of a flow that bypasses the heat exchangers 25 and 14 through the communication pipe 403, thereby ensuring the heating capacity.

[First modification of the first embodiment]
As shown in FIG. 4, the on-off valve 28 may be provided between the reserve tank 27 and the first pump 21, that is, closer to the first pump 21 than the reserve tank 27 in the communication pipe 403. When the on-off valve 28 is closed in the heater mode M3, the suction portion 22A of the second pump 22 is connected to the reserve tank 27, and the suction portion 21A of the first pump 21 is not connected to the reserve tank 27 (one-way connection state S _One ). .

In the heater mode M3, the suction pressure of the second pump 22 corresponds to atmospheric pressure _P0 , and the suction pressure of the first pump 21 corresponds to a pressure lowered from the discharge pressure of the second pump 22 due to piping resistance or the like. Even if there is a pressure difference between the suction section 21A of the first pump 21 and the suction section 22A of the second pump 22, the on-off valve 28 is closed, so the heat medium is transferred from the first pump 21 side through the communication pipe 403. It does not flow out to the second pump 22 side.
Furthermore, since the suction portion 22A of the second pump 22 is connected to the reserve tank 27, it is possible for the heat medium to enter and exit the reserve tank 27 as the temperature changes.

In other words, similarly to the first embodiment, when using the heater mode M3 or the start-up heater mode, etc., when using the series circuit CC, the necessary heating is avoided by bypassing the heat medium through the communication pipe 403 and reducing the heating capacity. The capacity can be guaranteed, and the internal pressure of the heat medium piping can be maintained at an appropriate value.

[Second modification of the first embodiment]
As shown in FIG. 5, the first pump 21 is connected to the reserve tank 27 via the first communication pipe 403A, and the second pump 22 is connected to the reserve tank 27 via the second communication pipe 403B. Good too. The reserve tank 27 is formed with liquid inlets and outlets to which the first and second communication pipes 403A and 403B are connected, respectively.

The on-off valve 28 is provided in the first communication pipe 403A located on the first pump 21 side, almost similarly to the first modification. However, almost similarly to the first embodiment, the on-off valve 28 may be provided in the second communication pipe 403B located on the second pump 22 side.

The second modification also provides the same effects and effects as those of the first embodiment.

[Third modification of first embodiment]
By using the three-way valve 28-3 as a connection valve shown in FIG. 6, it is also possible to give one connection state S _One or both connection state S _Both to the first and second pumps 21 and 22. As shown in FIG. 6, when the black port of the three-way valve 28-3 is closed, the suction portion of the first pump 21 is 21A is connected to the reserve tank 27, and the suction part 22A of the second pump 22 is not connected to the reserve tank 27.
By changing the closing port of the three-way valve 28-3, it is also possible to connect the suction portion 22A of the second pump 22 to the reserve tank 27 as in the first modification.

The third modification also provides the same effects and effects as those of the first embodiment.

[Fourth modification of the first embodiment]
As shown in FIG. 7, the positions of the first and second pumps 21 and 22 may be changed, and the positions of the reserve tank 27 and the on-off valve 28 may also be changed accordingly.
The first pump 21 is provided in a pipe 404 that connects the outdoor heat exchanger 23 and the first switching valve 31, and the second pump 22 is provided in a pipe 405 that connects the indoor heat exchanger 25 and the first switching valve 31. It is being It is preferable that the first pump 21 and the second pump 22 are arranged close to each other with the first switching valve 31 in between.

The reserve tank 27 is connected to a communication pipe 403 that connects the suction section 21A of the first pump 21 and the suction section 22A of the second pump 22. The on-off valve 28 is provided on the second pump 22 side or the first pump 21 side in the communication pipe 403.

Note that the first pump 21 is provided in a pipe 406 between the first switching valve 31 and the condenser 12, and the second pump 22 is provided in a pipe 407 between the first switching valve 31 and the evaporator 14. It's okay. In this case as well, it is preferable that the suction section 21A of the first pump 21 and the suction section 22A of the second pump 22 be communicated with each other through a communication pipe, and that a reserve tank 27 and an on-off valve 28 are provided in this communication pipe.

According to the fourth modification, even if the positions of the pumps 21, 22 and the reserve tank 27 are different, the same actions and effects as in the first embodiment can be obtained.

[Fifth modification of the first embodiment]
The temperature control system 1-5 shown in FIG. 8 includes a battery device 6 as a temperature control target, and two indoor heat exchangers 25-1 and 25-2 for dehumidifying and heating the interior of the vehicle compartment 8. ing. The first indoor heat exchanger 25-1 is placed upstream of the air flow, and the second indoor heat exchanger 25-2 is placed downstream of the air flow.

During heat pump mode M2 shown in FIG. 8, the low temperature heat medium flowing out from the evaporator 14 is supplied to the first indoor heat exchanger 25-1, and the high temperature heat medium flowing out from the condenser 12 is supplied to the second indoor heat exchanger 25-1. 2. Therefore, the air sent from the indoor fan 25A is dehumidified as it is cooled to below the dew point by heat exchange with the low-temperature heat medium by the first indoor heat exchanger 25-1, and then transferred to the second indoor heat exchanger 25-1. It is heated by heat exchange with the high-temperature heat medium by No. 2 and is blown out into the passenger compartment 8.

Although not shown in detail, the battery device 6 includes a battery main body which is a storage battery, and a battery heat exchanger and a heat radiating member provided in the battery main body as necessary.
The heat medium circuit 20 corresponds to heat exchange paths 414 and 415 configured to allow heat exchange between the battery device 6 and the heat medium directly or indirectly through air or the like, and heat exchange paths 414 and 415, respectively. It also includes battery switching valves 34 and 35 as four-way valves that switch between open and closed circuits.

In the heat pump mode M2, for example, the low-temperature heat medium flowing out from the first indoor heat exchanger 25-1 can be supplied to the battery device 6 from the first battery switching valve 34 through the first heat exchange path 414.
Although illustration of the heater mode M3 of the fifth modification is omitted, in the heater mode M3, the high temperature heat medium flowing out from the second indoor heat exchanger 25-2 is transferred from the first battery switching valve 34 to the first heat exchanger. The battery device 6 can be supplied through the path 414.

The fifth modification also provides the same functions and effects as those of the first embodiment.

[Second embodiment]
Next, a second embodiment of the present disclosure will be described with reference to FIGS. 9 and 10. The temperature control system 2 of the second embodiment includes a refrigerant heat exchanger 14-2 on the indoor side to which refrigerant circulating in the refrigerant circuit 10 is supplied.

Similar to the refrigerant circuit 10 of the first embodiment, the refrigerant circuit 10-2 of the temperature control system 2 includes a compressor 11, a condenser 12, a first expansion valve 13-1 as a first pressure reducing section, and an evaporator 14. A first refrigerant circuit R1 configured to allow refrigerant to circulate through -1, a compressor 11, a condenser 12, a second expansion valve 13-2 as a second pressure reducing section, and a refrigerant heat exchanger 14 as an evaporator. -2 and a second refrigerant circuit R2 configured to allow refrigerant to circulate. The refrigerant heat exchanger 14-2 exchanges heat between the refrigerant and air.

The first refrigerant circuit R1 and the second refrigerant circuit R2 can each independently form a refrigeration cycle. When both the first refrigerant circuit R1 and the second refrigerant circuit R2 are used simultaneously, the respective expansion valves and evaporators of the first refrigerant circuit R1 and the second refrigerant circuit R2 are connected in parallel.
The second refrigerant circuit R2 includes a pipe 501 connected to the refrigerant outlet side of the condenser 12 and a pipe 502 connected to the refrigerant discharge side of the evaporator 14.

According to the temperature control system 2, similarly to the temperature control systems of the first embodiment and its modifications, it is possible to realize a cooling mode, a dehumidifying heating mode, a heat pump mode, a heater mode, a startup heater mode, and the like. Here, the cooling mode M1 is illustrated.

The heat medium circuit 20 provided in the temperature control system 2 is configured in substantially the same manner as the heat medium circuit 20 of the first embodiment. However, the second switching valve 32 has been changed from a four-way valve to a three-way valve.

The refrigerant heat exchanger 14-2 is arranged on the upstream side of the airflow by the indoor blower 25A that sends air to the refrigerant heat exchanger 14-2 and the indoor heat exchanger 25. Indoor heat exchanger 25 is arranged on the downstream side of the air flow.

In the cooling mode M1 or the heat pump mode (not shown), the heat medium circuit 20 includes a first circuit C1 for the heat medium flowing into the evaporator 14 after flowing out from the evaporator 14, and a first circuit C1 for the heat medium flowing into the evaporator 14 after flowing out from the condenser 12; A second circuit C2 for the heat medium flowing into the heat transfer medium 12 is set. However, in some modes including the cooling mode M1, the first circuit C1 is not used. Therefore, the operation of the first pump 21 that pumps the heat medium of the first circuit C1 is stopped.

In a heater mode (not shown) or a start-up heater mode, a series circuit CC including a condenser 12 and an evaporator 14 arranged in series is set in the heat medium circuit 20.

Now, with reference to FIG. 9, the respective flows of the refrigerant and the heat medium will be explained.
The cooling mode M1 uses only the second refrigerant circuit R2 among the first refrigerant circuit R1 and the second refrigerant circuit R2. Therefore, the first expansion valve 13-1 of the first refrigerant circuit R1 is closed.
Further, in the cooling mode M1, only the second circuit C2 (used circuit) is used, and the first circuit C1 (unused circuit) is not used. Therefore, the operation of the first pump 21 that pumps the heat medium of the first circuit C1 is stopped.

Since parallel circuits C1 and C2 are set in the heat medium circuit 20, the on-off valve 28 is open. That is, the suction portion 21A of the first pump 21 and the suction portion 22A of the second pump 22 are connected to the reserve tank 27 (both connected state S _Both ). Regardless of whether or not the pumps 21 and 22 are operating, both the first and second circuits C1 and C2 are connected to the reserve tank 27, so the internal pressure of the heat medium piping is maintained at an appropriate value. . Further, since both the suction section 21A of the first pump 21 and the suction section 22A of the second pump 22 are maintained at atmospheric pressure, the heat medium does not flow through the communication pipe 403.

The flow of refrigerant in the second refrigerant circuit R2 will be explained. The refrigerant gas sucked into the compressor 11 is adiabatically compressed and discharged by the compressor 11, and is liquefied by heat exchange with the heat medium in the condenser 12. Further, the refrigerant flows into the second expansion valve 13-2 through the pipe 501 and expands adiabatically due to pressure reduction by the second expansion valve 13-2, so that the refrigerant whose temperature has decreased flows into the refrigerant heat exchanger 14-2. do. The air sent from the indoor blower 25A is cooled by the refrigerant flowing through the refrigerant heat exchanger 14-2, thereby cooling the interior of the vehicle compartment 8. The refrigerant leaving the refrigerant heat exchanger 14-2 flows through the pipe 502 and is sucked into the compressor 11.

As for the flow of the heat medium, the heat medium in the second circuit C2 transfers heat received from the refrigerant by the condenser 12 to the outdoor heat exchanger 23. The heat medium radiated to the outside air by the outdoor heat exchanger 23 returns to the condenser 12 via the first switching valve 31.

According to the cooling mode M1 of the temperature control system 2, the temperature control target can be directly cooled by the refrigerant supplied to the refrigerant heat exchanger 14-2, which is an evaporator that is a cold source, without using a heat medium. becomes possible. Therefore, the cooling capacity can be improved, and the followability of the control to temperature changes in the temperature control target and the outside air can also be improved.

FIG. 10 shows that when the second pump 22 corresponding to the second circuit C2 (used section) stops due to a failure, the first pump 21 corresponding to the first circuit C1 (unused circuit) is activated to cool the air conditioner. It shows how the operation in mode M1 is continued.
When the control device 5 detects that the second pump 22 has failed, for example from a measured refrigerant pressure value, the control device 5 operates the first pump 21 by a control command. Then, as shown in FIG. 10, the suction section 21A of the failed first pump 21 and the suction section 22A of the second pump 22 communicate with each other via the communication pipe 403, so that the heat medium pumped by the first pump 21 is circulated through the outdoor heat exchanger 23 and the condenser 12. At this time, the communication path 403 and a part of the first circuit C1 are incorporated into the second circuit C2.

As the means for pumping the heat medium in the cooling mode M1 of the second embodiment, the second pump 22 can be replaced with the first pump 21, and the first pump 21 can also be replaced with the second pump 22. In other words, if the first pump 21 fails while operating the first pump 21 to perform the cooling mode M1 as shown in FIG. 10, the second pump 22 is activated as shown in FIG. By doing so, the cooling mode M1 can be continued.

Not only in the cooling mode M1, but also when either the first or second pump 21 or 22 is arranged in an unused section of the heat medium circuit 20, that is, when only one of the first circuits C1 and C2 is used. , the same pump replacement as above is possible.

In addition to the above, it is possible to select the configurations mentioned in the above embodiments or to change them to other configurations as appropriate.

[Additional notes]
From the above disclosure, the configuration described below can be understood.
[1] A temperature control system for vehicles,
A refrigerant circuit (10) including a compressor (11), a high-pressure side heat exchanger (12), a pressure reducing section (13), and a low-pressure side heat exchanger (14), and configured to allow refrigerant to circulate according to a refrigeration cycle; ,
a heat medium circuit (20) configured to allow circulation of a heat medium that transfers heat to and receives heat from the refrigerant;
The heat medium circuit (20) includes:
the high-pressure side heat exchanger (12) for exchanging heat between the refrigerant and the heat medium;
the low pressure side heat exchanger (14) for exchanging heat between the refrigerant and the heat medium;
A first pump (21) and a second pump (22) configured to be able to pump the heat medium;
an outdoor heat exchanger (23) that exchanges heat between outside air and the heat medium;
A temperature control device (25) corresponding to a temperature control object heated or cooled by the heat medium or used for heating or cooling a temperature control object;
a reserve tank (27) capable of storing the heat medium and configured to be connectable to the suction portions (21A, 22A) of the first pump (21) and the second pump (22);
The first pump (21) and the second pump (22) can be connected to the reserve tank (27) in a one-way connected state (S One ) in which one is connected, and in a both-connected state (S _One ) in which both are connected. a connection valve (28) configured to be able to provide either a connection state ( _SBot );
The heat medium circuit (20) includes:
A first circuit (C1) including the low pressure side heat exchanger (14) and corresponding to the first pump (21), and a first circuit (C1) including the high pressure side heat exchanger (12) and corresponding to the second pump (22). The second circuit (C2) is configured to be able to be set in parallel with the corresponding second circuit (C2), and includes the low pressure side heat exchanger (14) and the high pressure side heat exchanger (12) arranged in series. A series circuit (CC) corresponding to the first pump (21) and the second pump (22) can be set. Vehicle temperature control system.

[2] When the first circuit (C1) and the second circuit (C2) are set for the first pump (21) and the second pump (22), the connection valve (28) It is configured to be able to provide the both connection state (S _Both ) and to provide the one connection state (S _One ) when the series circuit (CC) is set;
[1] The vehicle temperature control system according to item [1].

[3] An outdoor bypass path (24) for detouring the heat medium from the outdoor heat exchanger is provided, and
As an operation mode using the series circuit (CC),
The heat medium flowing out from the high pressure side heat exchanger (12) flows into the low pressure side heat exchanger (14) via the temperature control device (25), and further flows through the outdoor bypass path (24). and a compressor heat source mode (M3) flowing into the high pressure side heat exchanger (12);
The vehicle temperature control system according to [1] or [2].

[4] The connection valve (28) is an on-off valve (28) provided between the suction part (22A) of the second pump (22) and the liquid inlet/outlet part (27A) of the reserve tank (27). Equivalent to,
The vehicle temperature control system according to any one of [1] to [3].

[5] The connection valve (28) is an on-off valve (28) provided between the suction part (21A) of the first pump (21) and the liquid inlet/outlet part (27A) of the reserve tank (27). Equivalent to,
The vehicle temperature control system according to any one of [1] to [3].

[6] The connection valve (28-3) connects the suction part (21A) of the first pump (21), the suction part (22A) of the second pump (22), and the reserve tank (27). Corresponding to the three-way valve (28-3) corresponding to the liquid inlet/outlet part (27A),
The vehicle temperature control system according to any one of [1] to [3].

[7] An operation mode using only one of the first circuit (C1) and the second circuit (C2),
In the operation mode, one of the first circuit (C1) and the second circuit (C2) is a used circuit, the other is an unused circuit, and the first pump (21) and the second pump ( 22), the both connection state (S _Both ) is given,
During the operation mode, if one of the first pump (21) and the second pump (22) corresponding to the used circuit fails, the other pump corresponding to the unused circuit is activated. By doing so, the usage circuit includes a communication path (403) that connects the suction portions (21A, 22A) of the first pump (21) and the second pump (22) to the reserve tank (27). ) and a part of the unused circuit are incorporated,
The vehicle temperature control system according to any one of [1] to [6].

[8] A temperature control method using a vehicle temperature control system, comprising:
The temperature control system is
A refrigerant circuit (10) including a compressor (11), a high-pressure side heat exchanger (12), a pressure reducing section (13), and a low-pressure side heat exchanger (14), and configured to allow refrigerant to circulate according to a refrigeration cycle; ,
a heat medium circuit (20) configured to allow circulation of a heat medium that transfers heat to and receives heat from the refrigerant;
The heat medium circuit (20) includes:
the high-pressure side heat exchanger (12) for exchanging heat between the refrigerant and the heat medium;
the low pressure side heat exchanger (14) for exchanging heat between the refrigerant and the heat medium;
A first pump (21) and a second pump (22) configured to be able to pump the heat medium;
an outdoor heat exchanger that exchanges heat between outside air and the heat medium;
A temperature control device (25) corresponding to a temperature control object heated or cooled by the heat medium or used for heating or cooling a temperature control object;
a reserve tank (27) capable of storing the heat medium and configured to be connectable to the suction portions (21A, 22A) of the first pump (21) and the second pump (22);
The first pump (21) and the second pump (22) can be connected to the reserve tank (27) in a one-way connected state (S One ) in which one is connected, and in a both-connected state (S _One ) in which both are connected. a connection valve (28) configured to be able to provide either a connection state ( _SBot );
The heat medium circuit (20) includes:
A first circuit (C1) including the low pressure side heat exchanger (14) and corresponding to the first pump (21), and a first circuit (C1) including the high pressure side heat exchanger (12) and corresponding to the second pump (22). The second circuit (C2) is configured to be able to be set in parallel with the corresponding second circuit (C2), and includes the low pressure side heat exchanger (14) and the high pressure side heat exchanger (12) arranged in series. A series circuit (CC) corresponding to the first pump (21) and the second pump (22) can be set.
The temperature control method is
When the first circuit (C1) and the second circuit (C2) are set, the connection valve (28) connects both the first pump (21) and the second pump (22). state (S _Both ), and when the series circuit (CC) is set, the connection valve (28) connects the first pump (21) and the second pump (22) to the one-way connection state. give (S _One ),
Vehicle temperature control method.

1,1-5,2 Temperature control system (vehicle temperature control system)
5 Control device 6 Battery device 8 Compartment 10, 10-2 Refrigerant circuit 11 Compressor 12 Condenser (high pressure side heat exchanger)
12A Condenser bypass path 12V Condenser flow rate adjustment valve 13 Expansion valve (pressure reducing part)
14,14-1 Evaporator (low pressure side heat exchanger)
14-2 Refrigerant heat exchanger 14A Evaporator bypass path 14V Evaporator flow rate adjustment valve 20 Heat medium circuit 21 First pump 21A Suction section 22 Second pump 22A Suction section 23 Outdoor heat exchanger 23A Outdoor blower 24 Outdoor bypass path 25 Indoor Heat exchanger 25A Indoor blower 26 Indoor bypass path 27 Reserve tank 27A Liquid inlet/outlet (liquid inlet/outlet)
28 On-off valve (connection valve)
28-3 Three-way valve (connection valve)
31 First switching valve 32 Second switching valve 33 Third switching valve 34 First battery switching valve 35 Second battery switching valve 401, 402, 404 to 407 Piping 403 Communication piping (communication route)
403A First communication pipe 403B Second communication pipe 414 First heat exchange path 415 Second heat exchange path 501, 502 Piping C1 First circuit C2 Second circuit CC Series circuit M1 Cooling mode M2 Heat pump mode M3 Heater mode R1 First refrigerant Circuit R2 Second refrigerant circuit S _One one connection state S _Both both connection state U HVAC unit

Claims (8)

A temperature control system for a vehicle,
A refrigerant circuit including a compressor, a high-pressure side heat exchanger, a pressure reduction section, and a low-pressure side heat exchanger, and configured to allow refrigerant to circulate according to a refrigeration cycle;
a heat medium circuit configured to allow circulation of a heat medium that transfers heat to and receives heat from the refrigerant;
The heat medium circuit is
the high-pressure side heat exchanger that exchanges heat between the refrigerant and the heat medium;
the low-pressure side heat exchanger that exchanges heat between the refrigerant and the heat medium;
a first pump and a second pump configured to be able to pump the heat medium;
an outdoor heat exchanger that exchanges heat between outside air and the heat medium;
A temperature control device that corresponds to a temperature control object heated or cooled by the heat medium or is used for heating or cooling a temperature control object;
a reserve tank capable of storing the heat medium and configured to be connectable to suction portions of the first pump and the second pump;
The first pump and the second pump are configured to be connected to the reserve tank in either a one-way connected state in which one is connected or a both-connected state in which both are connected. a connecting valve;
The heat medium circuit is
A first circuit including the low pressure side heat exchanger and corresponding to the first pump and a second circuit including the high pressure side heat exchanger and corresponding to the second pump can be set in parallel. Along with
It includes the low pressure side heat exchanger and the high pressure side heat exchanger arranged in series, and is configured to be able to set a series circuit corresponding to the first pump and the second pump ,
The connection valve corresponds to an on-off valve provided between the suction part of the second pump and the liquid inlet/outlet part of the reserve tank.
Vehicle temperature control system. A temperature control system for a vehicle,
A refrigerant circuit including a compressor, a high-pressure side heat exchanger, a pressure reduction section, and a low-pressure side heat exchanger, and configured to allow refrigerant to circulate according to a refrigeration cycle;
a heat medium circuit configured to allow circulation of a heat medium that transfers heat to and receives heat from the refrigerant;
The heat medium circuit is
the high-pressure side heat exchanger that exchanges heat between the refrigerant and the heat medium;
the low-pressure side heat exchanger that exchanges heat between the refrigerant and the heat medium;
a first pump and a second pump configured to be able to pump the heat medium;
an outdoor heat exchanger that exchanges heat between outside air and the heat medium;
A temperature control device that corresponds to a temperature control object heated or cooled by the heat medium or is used for heating or cooling a temperature control object;
a reserve tank capable of storing the heat medium and configured to be connectable to suction portions of the first pump and the second pump;
The first pump and the second pump are configured to be connected to the reserve tank in either a one-way connected state in which one is connected or a both-connected state in which both are connected. a connecting valve;
The heat medium circuit is
A first circuit including the low pressure side heat exchanger and corresponding to the first pump and a second circuit including the high pressure side heat exchanger and corresponding to the second pump can be set in parallel. Along with
It includes the low pressure side heat exchanger and the high pressure side heat exchanger arranged in series, and is configured to be able to set a series circuit corresponding to the first pump and the second pump,
The connection valve corresponds to an on-off valve provided between the suction part of the first pump and the liquid inlet/outlet part of the reserve tank.
Vehicle temperature control system. The connection valve provides the first pump and the second pump with the connection state when the first circuit and the second circuit are set, and provides the connection state with the first pump and the second pump when the series circuit is set. configured to be able to provide connection status,
The vehicle temperature control system according to claim 1 or 2 . and an outdoor bypass path that detours the heat medium from the outdoor heat exchanger,
As an operation mode using the series circuit,
The heat medium flowing out from the high-pressure side heat exchanger flows into the low-pressure side heat exchanger via the temperature control device, and further passes through the outdoor bypass path and flows into the high-pressure side heat exchanger. Equipped with machine heat source mode,
The vehicle temperature control system according to claim 1 or 2. The connection valve corresponds to a three-way valve corresponding to a suction part of the first pump, a suction part of the second pump, and a liquid inlet/outlet part of the reserve tank.
The vehicle temperature control system according to claim 1 or 2. comprising an operation mode using only one of the first circuit and the second circuit,
In the operation mode, one of the first circuit and the second circuit is a used circuit, the other is an unused circuit, and the first pump and the second pump are both connected. ,
During the operation mode, if one of the first pump and the second pump corresponding to the used circuit breaks down, the other pump corresponding to the unused circuit is operated, and the unused circuit is activated. The circuit includes a communication path connecting the suction portion of each of the first pump and the second pump to the reserve tank, and a part of the unused circuit.
The vehicle temperature control system according to claim 1 or 2. A temperature control method using a vehicle temperature control system,
The temperature control system is
A refrigerant circuit including a compressor, a high-pressure side heat exchanger, a pressure reduction section, and a low-pressure side heat exchanger, and configured to allow refrigerant to circulate according to a refrigeration cycle;
a heat medium circuit configured to allow circulation of a heat medium that transfers heat to and receives heat from the refrigerant;
The heat medium circuit is
the high-pressure side heat exchanger that exchanges heat between the refrigerant and the heat medium;
the low-pressure side heat exchanger that exchanges heat between the refrigerant and the heat medium;
a first pump and a second pump configured to be able to pump the heat medium;
an outdoor heat exchanger that exchanges heat between outside air and the heat medium;
A temperature control device that corresponds to a temperature control object heated or cooled by the heat medium or is used for heating or cooling a temperature control object;
a reserve tank capable of storing the heat medium and configured to be connectable to suction portions of the first pump and the second pump;
The first pump and the second pump are configured to be connected to the reserve tank in either a one-way connected state in which one is connected or a both-connected state in which both are connected. a connecting valve;
The heat medium circuit is
A first circuit including the low pressure side heat exchanger and corresponding to the first pump and a second circuit including the high pressure side heat exchanger and corresponding to the second pump can be set in parallel. Along with
It includes the low pressure side heat exchanger and the high pressure side heat exchanger arranged in series, and is configured to be able to set a series circuit corresponding to the first pump and the second pump,
The connection valve corresponds to an on-off valve provided between the suction part of the second pump and the liquid inlet/outlet part of the reserve tank,
The temperature control method is
When the first circuit and the second circuit are set, the connection valve provides the first pump and the second pump with the connection state, and when the series circuit is set, the connection valve provides the first pump and the second pump with the connection state. providing the one-way connection state to the first pump and the second pump by a connection valve;
Vehicle temperature control method. A temperature control method using a vehicle temperature control system,
The temperature control system is
A refrigerant circuit including a compressor, a high-pressure side heat exchanger, a pressure reduction section, and a low-pressure side heat exchanger, and configured to allow refrigerant to circulate according to a refrigeration cycle;
a heat medium circuit configured to allow circulation of a heat medium that transfers heat to and receives heat from the refrigerant;
The heat medium circuit is
the high-pressure side heat exchanger that exchanges heat between the refrigerant and the heat medium;
the low-pressure side heat exchanger that exchanges heat between the refrigerant and the heat medium;
a first pump and a second pump configured to be able to pump the heat medium;
an outdoor heat exchanger that exchanges heat between outside air and the heat medium;
A temperature control device that corresponds to a temperature control object heated or cooled by the heat medium or is used for heating or cooling a temperature control object;
a reserve tank capable of storing the heat medium and configured to be connectable to suction portions of the first pump and the second pump;
The first pump and the second pump are configured to be connected to the reserve tank in either a one-way connected state in which one is connected or a both-connected state in which both are connected. a connecting valve;
The heat medium circuit is
A first circuit including the low pressure side heat exchanger and corresponding to the first pump and a second circuit including the high pressure side heat exchanger and corresponding to the second pump can be set in parallel. Along with
It includes the low pressure side heat exchanger and the high pressure side heat exchanger arranged in series, and is configured to be able to set a series circuit corresponding to the first pump and the second pump,
The connection valve corresponds to an on-off valve provided between the suction part of the first pump and the liquid inlet/outlet part of the reserve tank,
The temperature control method is
When the first circuit and the second circuit are set, the connection valve provides the first pump and the second pump with the connection state, and when the series circuit is set, the connection valve applies the connection state to the first pump and the second pump. providing the one-way connection state to the first pump and the second pump by a connection valve;
Vehicle temperature control method.

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