JP2017013548A - Vehicle air-conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle air-conditioner including a hot-water heater provided in a hot water cycle separately from a heating section provided in a refrigeration cycle, and capable of performing a heating operation while achieving energy conservation.SOLUTION: A vehicle air-conditioner comprises: a heat pump type refrigeration cycle 1 including a refrigerant/hot-water heat exchanger 3; a hot water cycle 10 including a water pump 11 circulating hot water subjected to heat exchange by the refrigerant/hot-water heat exchanger 3, a heater core 12, and a hot-water heater 13; and route switching means 20 switching over between a refrigerant/hot-water heat exchange route in which the hot water passes through the refrigerant/hot-water heat exchanger 3 and a hot-water heating route in which the hot water passes through the hot-water heater 13. The vehicle air-conditioner is configured such that when a current water temperature in the hot water cycle 10 is lower than a heating source switch water temperature, a route of the hot water cycle 10 is switched to the refrigerant/hot-water heat exchange route and the refrigeration cycle 1 is driven, and when the current water temperature in the hot water cycle 10 is higher than the heating source switch water temperature, the route of the hot water cycle 10 is switched to the hot-water heating route and the hot-water heater 13 is turned on.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vehicle air conditioner including a refrigeration cycle and a hot water heater different from the refrigeration cycle as heating means for hot water in the hot water cycle.

  As this type of vehicle air conditioner, the one disclosed in Patent Document 1 has been proposed. The vehicle air conditioner includes a refrigeration cycle 100 and a hot water cycle 110 as shown in FIG. The refrigeration cycle 100 includes a compressor 101 that compresses refrigerant, a refrigerant passage portion 102a of a refrigerant / hot water heat exchanger 102 that exchanges heat between the refrigerant compressed by the compressor 101 and hot water, and refrigerant / hot water heat exchange. An outdoor heat exchanger 103 that exchanges heat between the refrigerant heat-exchanged in the vessel 102 and the outside air, and an indoor heat exchanger 104 that exchanges heat between the refrigerant and the air supplied to the vehicle interior.

  The hot water cycle 110 includes a pump 111 that circulates hot water, a hot water passage 102b of the refrigerant / hot water heat exchanger 102 that exchanges heat between the hot water circulated by the pump 111, the hot water circulated by the pump 111, and the vehicle interior. Heater core 112 that exchanges heat with supplied air and heats air, electric hot water heater (hot water heater) 113 that heats hot water circulated by pump 111, and exhaust heat heater that uses exhaust heat (Hot water heater) 114 and a combustion heater (hot water heater) 115 for cold regions.

  In the heating operation, the refrigeration cycle 100 uses a path for the refrigerant to bypass the indoor heat exchanger 104, and uses the outdoor heat exchanger 103 as an evaporator. The outdoor heat exchanger 103 absorbs heat from the outside air, and the refrigerant / hot water heat exchanger 102 radiates heat from the refrigerant to the hot water, thereby heating the hot water. If only the refrigeration cycle 100 does not have sufficient hot water heating capability, for example, the electric hot water heater 113 is turned on in addition to the refrigeration cycle 100 to ensure the necessary heating capability.

JP-A-8-197937

  However, in the conventional vehicle air conditioner, since the hot water cycle 110 includes the electric hot water heater 113 and the like together with the hot water passage portion 102b of the refrigerant / hot water heat exchanger 102, the hot water capacity in the hot water cycle 110 is small. Therefore, compared with an apparatus that uses only the refrigeration cycle 100 as a heating means, large energy is required for heating the hot water. In addition, since the heat radiation efficiency to the hot water of the refrigerant / hot water heat exchanger 102 of the refrigeration cycle 100 is not considered, the use of the refrigeration cycle 100 and the electric hot water heater 113 or the like is different. There was a problem that it was not efficient and could not save energy.

  Therefore, the present invention has been made to solve the above-described problems, and includes a warm water cycle equipped with another warm water heater together with a heating unit in a refrigeration cycle, and heating operation can be performed with energy saving. An object of the present invention is to provide a vehicle air conditioner that can be used.

  The present invention relates to a compressor for compressing refrigerant, a refrigerant / hot water heat exchanger for exchanging heat between the refrigerant compressed by the compressor and hot water, a refrigerant exchanged with the refrigerant / hot water heat exchanger, and the outside air. A refrigeration cycle having an outdoor heat exchanger for exchanging heat between the pump, a pump for circulating hot water exchanged by the refrigerant / hot water heat exchanger, hot water circulated by the pump and air supplied to the vehicle interior A hot water cycle that has a hot water heater that heats hot water circulated by the pump provided separately from the refrigerant core and the hot water heat exchanger, and the hot water of the hot water cycle is A path switching that bypasses the hot water heater and passes through the refrigerant / hot water heat exchanger and the hot water heating path that passes through the refrigerant / hot water heat exchanger and that passes through the refrigerant / hot water heat exchanger. Means and the hot water rhino If the current water temperature in the water is lower than the heat source switching water temperature, the path of the hot water cycle is switched to the refrigerant / warm water heat exchange path, and the refrigeration cycle is driven, and the current water temperature in the hot water cycle is When the temperature is higher than the heating source switching water temperature, the vehicle air conditioner is characterized in that the path of the warm water cycle is switched to the warm water heating path and the warm water heater is turned on.

  According to the present invention, the path is switched according to the water temperature in the hot water cycle, and the hot water is circulated through a path that does not pass through the heating part that is not driven, so that the capacity of the hot water heated by the refrigeration cycle or the hot water heater can be reduced.

  In the low-temperature water region where the refrigeration cycle can efficiently heat the hot water in the refrigerant / hot water heat exchanger, the refrigeration cycle can be driven and the refrigeration cycle can efficiently heat the hot water. However, in the hot water heater, the hot water heater is turned on in the high temperature water region where the heating efficiency to the hot water is not lowered. Therefore, the hot water temperature can be efficiently increased by the refrigeration cycle and the hot water heater. As described above, the warm water cycle is provided with another warm water heater together with the heating unit of the refrigeration cycle, and the heating operation can be performed with energy saving.

BRIEF DESCRIPTION OF THE DRAWINGS It is 1st Embodiment of this invention and is the whole schematic block diagram of the vehicle air conditioner. 1 is a schematic flowchart of a heating operation according to a first embodiment of the present invention. It is a flowchart at the time of transient operation which shows 1st Embodiment of this invention. It is a flowchart at the time of steady operation which shows 1st Embodiment of this invention. It is a flowchart at the time of a defrost driving | operation which shows 1st Embodiment of this invention. It is a whole schematic block diagram of the air conditioning apparatus for vehicles which shows 2nd Embodiment of this invention. (A) is a characteristic diagram of the target water temperature with respect to the room temperature difference, and (b) is a characteristic diagram of the heating source switching water temperature with respect to the outside air temperature. It is a whole schematic block diagram of the vehicle air conditioner of a prior art example.

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

(First embodiment)
1 to 5 show a first embodiment of the present invention. As shown in FIG. 1, the vehicle air conditioner includes a heat pump refrigeration cycle 1, a hot water cycle 10, path switching means 20 for switching the hot water path of the hot water cycle 10, and a control unit (not shown). )).

  The refrigeration cycle 1 includes a compressor 2 that compresses refrigerant, a refrigerant passage portion 3a of a refrigerant / hot water heat exchanger 3 that exchanges heat between the refrigerant compressed by the compressor 2 and hot water, and refrigerant / hot water heat exchange. The first refrigerant bypass passage 4a that bypasses the refrigerant passage portion 3a of the cooler 3, the first refrigerant on-off valve that opens and closes the first refrigerant bypass passage 4a, and the refrigerant heat-exchanged by the refrigerant / hot water heat exchanger 3 are decompressed. An outdoor heat exchanger 7 for exchanging heat between the first expansion valve 6a and the refrigerant heat exchanged by the refrigerant / hot water heat exchanger 3 or the refrigerant bypassed by the refrigerant / hot water heat exchanger 3 and the outside air; The second expansion valve 6b that decompresses the refrigerant that has exited the outdoor heat exchanger 7, and the indoor heat exchanger that exchanges heat between the refrigerant decompressed (expanded) by the second expansion valve 6b and the air supplied to the room 8, a second refrigerant bypass passage 4 b that bypasses the indoor heat exchanger 8, and a second expansion valve b and a second refrigerant on-off valve that opens and closes the refrigerant passage to the indoor heat exchanger 8, a third refrigerant on-off valve 5c that opens and closes the second refrigerant bypass passage 4b, and a function of separating the gas and liquid of the refrigerant, etc. And an accumulator 9 that sends only a gaseous refrigerant to the compressor 2.

  The warm water cycle 10 includes a water pump 11 that circulates warm water, warm water circulated by the water pump 11, and warm water passing section 3b of the coolant / warm water heat exchanger 3 in which the warm water passing therethrough is heated by the coolant. A water pump is provided separately from the heater core 12 that exchanges heat between the hot water circulated by the pump 11 and the air supplied to the passenger compartment, and heats the air, and the hot water passage 3b of the refrigerant / hot water heat exchanger 3. 11 and a sheathed heater 13 which is a hot water heater for heating the hot water circulated in the apparatus 11.

  In the hot water cycle 10, a hot water passage portion 3 b of the refrigerant / hot water heat exchanger 3 and a sheathed heater 13 are arranged in series with respect to the water pump 11.

  The path switching means 20 opens and closes a first hot water bypass path 21 that connects between the inlet of the hot water passage portion 3 b of the refrigerant / hot water heat exchanger 3 and the inlet of the sheathed heater 13, and the first hot water bypass path 21. The 1st warm water on-off valve 22, the 2nd warm water bypass path 23 which connects between the exit of the warm water passage part 3b of the refrigerant | coolant and warm water heat exchanger 3, and the exit of the sheathed heater 13 are opened and closed. A second hot water on-off valve 24 is provided.

  By opening and closing the first hot water on-off valve 22 and the second hot water on-off valve 24, the hot water bypasses the sheathed heater 13 and passes through the hot water passage part 3b of the refrigerant / hot water heat exchanger 3, and the hot water It is possible to switch to a hot water heating path that bypasses the hot water passage portion 3 b of the refrigerant / hot water heat exchanger 3 and passes through the sheathed heater 13.

  The blower 32 in the air conditioning unit is arranged in the order of the blower 32 from the upstream side, the indoor heat exchanger 8 described above, the mix door 33, and the heater core 12, and passes through the indoor heat exchanger 8 and the heater core 12. The temperature-controlled conditioned air is supplied into the passenger compartment.

  The control unit (not shown) includes the compressor 2 of the refrigeration cycle 1 based on the input information of the air conditioner operation unit (not shown), sensor information such as the vehicle room temperature sensor SE1, the outside air temperature sensor SE2, and the water temperature sensor SE3. The 1st-3rd refrigerant | coolant on-off valves 5a-5c, the water pump 11, the blower 32, the mix door 33, etc. of the warm water cycle 10 are controlled. The vehicle room temperature sensor SE1 detects the temperature in the vehicle interior. The outside air temperature sensor SE2 detects the temperature of the outside air. The water temperature sensor SE3 detects the hot water temperature of the hot water cycle 10. The control content of the control unit will be described in the following operation flow of the heating operation.

  Next, heating operation using the refrigeration cycle 1 as a heating source and heating operation using the sheathed heater 13 as a heating source will be described. In the heating operation using the refrigeration cycle 1 as a heating source, the first refrigerant on / off valve 5a is in the closed position, the second refrigerant on / off valve 5b is in the closed position, and the third refrigerant on / off valve 5c is in the open position. Thus, in the refrigeration cycle 1, the refrigerant passage 3a of the refrigerant / hot water heat exchanger 3 functions as a condenser (condenser), the first expansion valve 6a depressurizes the refrigerant, and the outdoor heat exchanger 7 is an evaporator ( Function as an evaporator). Then, the hot water of the hot water cycle 10 is circulated, and the refrigerant passage portion 3 a of the refrigerant / hot water heat exchanger 3 of the refrigeration cycle 1 heats the hot water of the hot water cycle 10 to heat the heater core 12. In the heating operation using the sheathed heater 13 as a heating source, the warm water of the warm water cycle 10 is circulated, and the sheathed heater 13 heats the warm water of the warm water cycle 10 to heat the heater core 12.

  Next, the heating operation of the vehicle air conditioner will be described. As shown in FIG. 2, when the air conditioner switch is turned on and the heating operation is selected (step S1), it is determined whether or not the outdoor heat exchanger 7 is frosted (step S2). If frost formation occurs, frost formation operation is performed (step S50). The frosting operation will be described below.

  If it is not frosted, it enters heating operation. In the heating operation, first, the current vehicle room temperature and the target vehicle room temperature are compared (step S3). The current vehicle room temperature is obtained from the vehicle room temperature sensor SE1. When the current vehicle room temperature is lower than (target vehicle room temperature −3 ° C.), transient operation is performed (step S10), and when the current vehicle room temperature is higher than (target vehicle room temperature −3 ° C.), steady operation is performed. Perform (step S30).

  First, transient operation will be described. In the transient operation, as shown in FIG. 3, first, the water pump 11 is driven (step S11). The current outside air temperature is measured by the outside air temperature sensor SW2 (step S12), and the target water temperature is calculated from the room temperature difference (temperature difference between the current vehicle room temperature and the target room temperature) (step S13). As shown by the characteristic line in FIG. 7A, the target water temperature is set to a high water temperature when the degree of room temperature difference is large, and to a low water temperature when it is small. That is, the larger the room temperature difference, the larger the heating power, and the smaller the room temperature difference, the smaller the heating power.

  Next, the current water temperature is measured from the water temperature sensor SE3 (step S14), and it is determined whether or not the current water temperature is within the target water temperature ± 2 ° C. (step S15). If the current water temperature is within the target water temperature ± 2 ° C., the refrigeration cycle 1 (compressor 2) or the sheathed heater 13 is operated with partial power that maintains the current vehicle room temperature (step S16).

  When the current water temperature has a temperature difference exceeding the target water temperature ± 2 ° C. (when it is low), the heating source switching water temperature is calculated (step S17). Here, the heating source switching water temperature is determined by the outside air temperature as shown by the characteristic line in FIG. 7B, and is set to a high temperature when the outside air temperature is high, and to a low temperature when the outside air temperature is low. That is, when the outside air temperature is high, the outdoor heat exchanger 7 can sufficiently absorb heat from the outside air, and the refrigerant / hot water heat exchanger 3 can sufficiently dissipate heat. On the other hand, when the outside air temperature is low, the outdoor heat exchanger 7 cannot sufficiently absorb heat from the outside air, and the refrigerant / hot water heat exchanger 3 cannot sufficiently radiate heat. The characteristic line in FIG. 7B is determined as being possible when the heat reception from the refrigerant to the hot water in the refrigerant / hot water heat exchanger 3 has a temperature difference of 7 degrees or more. Further, when the refrigeration cycle 1 has an outside air temperature (−10 ° C. or less) that cannot absorb heat from outside air, the heating source switching water temperature is set to the same temperature as the outside air temperature.

  Next, the current water temperature and the heat source switching water temperature are compared (step S18). When the current water temperature is lower than the heat source switching water temperature, the sheathed heater 13 is turned off and the refrigeration cycle 1 (compressor 2) is driven (step S19). The refrigeration cycle 1 (compressor 2) is driven at full power. The reason why the refrigeration cycle 1 is used when the current water temperature is low is that heat can be efficiently radiated from the refrigerant in the refrigerant / hot water heat exchanger 3 to the hot water.

  After driving the refrigeration cycle 1 (compressor 2), the timer is set to zero (step S20). Next, the first hot water on / off valve 22 is set to the closed position, and the second hot water on / off valve 24 is set to the open position (step S21). Thus, the path of the hot water cycle 10 is a refrigerant / hot water heat exchange path through which the hot water passes only through the refrigerant / hot water heat exchanger 3. And the air volume of the blower 32 is adjusted based on the temperature of warm water (step S22). When the water temperature is low, the air volume is adjusted to a low air volume, and when the water temperature is above a certain temperature, the air volume is adjusted to the maximum air volume.

  On the other hand, when the current water temperature is the same as or higher than the heat source switching water temperature, the sheathed heater 13 is turned on (step S23). The sheathed heater 13 is driven at full power. When the sheathed heater 13 is turned on, it is confirmed whether or not the refrigeration cycle 1 (compressor 2) is being driven (step S24). If the refrigeration cycle 1 (compressor 2) is being driven, a timer (not shown) starts counting (step S25), on condition that the timer count reaches a predetermined count (a predetermined time elapses) ( Step S26) If the refrigeration cycle 1 (compressor 2) is being driven, the refrigeration cycle 1 (compressor 2) is turned off (step S27). Then, the first hot water on / off valve 22 is set to the open position, and the second hot water on / off valve 24 is set to the closed position (step S28). Thus, the path of the hot water cycle 10 is a hot water heating path through which the hot water passes only through the sheathed heater 13. That is, when switching from heating by the refrigeration cycle 1 to heating by the sheathed heater 13, the sheathed heater 13 is turned on for a predetermined time and the water temperature in the sheathed heater 13 is warmed. Further, the reason why the sheathed heater 13 is used when the current water temperature is high is that the heating efficiency to the warm water does not decrease in the sheathed heater 13 even when the water temperature is high.

  When the refrigeration cycle 1 (compressor 2) is not driven when the sheath heater 13 is turned on, the first hot water on / off valve 22 is immediately set to the open position and the second hot water on / off valve 24 is set to the closed position (step S28). . And the air volume of the blower 32 is adjusted based on the temperature of warm water (step S22). When the water temperature is low, the air volume is adjusted to a low air volume, and when the water temperature is above a certain temperature, the air volume is adjusted to the maximum air volume.

  Next, steady operation will be described. In the steady operation, as shown in FIG. 4, first, the water pump 11 is driven (step S31), and it is determined whether or not the current water temperature is lower than the heating source switching water temperature (step S32). Here, the heat source switching water temperature is determined by the outside air temperature, and is set to a high temperature when the outside air temperature is high, and to a low temperature when the outside air temperature is low. That is, when the outside air temperature is high, the outdoor heat exchanger 7 can sufficiently absorb heat from the outside air, and the refrigerant / hot water heat exchanger 3 can sufficiently dissipate heat. On the contrary, when the outside air temperature is low, the outdoor heat exchanger 7 cannot sufficiently absorb heat from the outside air, and the refrigerant / hot water heat exchanger 3 cannot sufficiently radiate heat.

  If the current water temperature is lower than the heat source switching water temperature, the first hot water on / off valve 22 is closed and the second hot water on / off valve 24 is opened (step S33). Thus, the path of the hot water cycle 10 is a refrigerant / hot water heat exchange path through which the hot water passes only through the refrigerant / hot water heat exchanger 3. Then, the current water temperature is compared with the target water temperature (step S34). If the current water temperature is lower than the target water temperature, the sheathed heater 13 is turned off, and the refrigeration cycle 1 (compressor 2) is operated with partial power that maintains the current vehicle room temperature (step S35). The reason why the refrigeration cycle 1 is used when the current water temperature is lower than the heat source switching water temperature is that heat can be efficiently radiated from the refrigerant in the refrigerant / hot water heat exchanger 3 to the hot water. When the current water temperature is equal to or higher than the target water temperature, both the refrigeration cycle 1 (compressor 2) and the sheathed heater 13 are turned off (step S36).

  On the other hand, when the current water temperature is the same as or higher than the heat source switching water temperature, the first hot water on / off valve 22 is set to the open position and the second hot water on / off valve 24 is set to the closed position (step S37). Thus, the path of the hot water cycle 10 is a hot water heating path through which the hot water passes only through the sheathed heater 13. Then, the current water temperature is compared with the target water temperature (step S38). When the current water temperature is lower than the target water, the refrigeration cycle 1 (compressor 2) is turned off, and the sheathed heater 13 is operated with partial power that maintains the current vehicle room temperature (step S39). The reason why the sheathed heater 13 is used when the current water temperature is the same as or higher than the heating source switching water temperature is that the efficiency of heating to the warm water does not decrease even if the warm water is high. If the current water temperature is higher than the target vehicle room temperature, both the refrigeration cycle 1 (compressor 2) and the sheathed heater 13 are turned off (step S36).

  Then, the air volume of the blower 32 is adjusted based on the temperature of the hot water (step S40). Specifically, the air volume is gradually decreased in accordance with the decrease in the water temperature, and the state is changed to the steady air blowing state without changing the temperature at which the air is blown into the passenger compartment.

  Next, the defrosting operation will be described. In the defrosting operation, as shown in FIG. 5, the refrigeration cycle 1 is driven in a cooling operation (step S51). That is, the outdoor heat exchanger 7 is used as a condenser to remove the attached frost. Next, the water pump 11 is turned on (step S52), and it is determined whether or not the defrosting state is the first time (step S53). If the defrosting state is the first time, the sheathed heater 13 is turned on (step S54), and the timer is set to zero (step S55). The frost formation means that the hot water was heated using the refrigeration cycle 1, and therefore the refrigerant / hot water heat exchange path is operated until the water temperature in the sheathed heater 13 is warmed.

  If the detection of the defrosting state is not the first time, that is, if it is the second time or later, the timer count is started (step S56), on condition that the timer count reaches a predetermined count (a predetermined time elapses) ( In step S57), the first hot water on / off valve 22 is set to the open position, and the second hot water on / off valve 24 is set to the closed position (step S58). Thus, the path of the hot water cycle 10 is a hot water heating path through which hot water passes only through the sheathed heater 13, and the sheathed heater 13 is operated with partial power to maintain the current vehicle room temperature (step S59). Then, the air volume of the blower 32 is adjusted (step S60).

  As described above, the first embodiment has the following effects. When the current water temperature in the hot water cycle 10 is lower than the heating source switching water temperature, the path of the hot water cycle 10 is switched to the refrigerant / warm water heat exchange path, and the refrigeration cycle 1 is driven. When the water temperature is higher than the heating source switching water temperature, control is performed so that the path of the hot water cycle 10 is switched to the warm water heating path and the sheathed heater 13 is turned on.

  Therefore, since the path is switched according to the water temperature in the hot water cycle 10 and the hot water is circulated through a path that does not pass through the heating part that is not driven, the hot water capacity that the refrigeration cycle 1 or the sheathed heater 13 heats can be reduced.

  Further, in the low temperature water region where the refrigeration cycle 1 can efficiently heat the warm water in the refrigerant / hot water heat exchanger 3, the refrigeration cycle 1 is driven and the refrigeration cycle 1 efficiently heats the warm water. However, in the sheathed heater 13, in the high temperature water region where the heating efficiency to warm water does not decrease, the sheathed heater 13 is turned on, so that the warm water temperature is efficiently increased by the refrigeration cycle 1 and the sheathed heater 13. Can be made. As described above, the warm water cycle 10 is provided with another sheathed heater 13 together with the heating unit of the refrigeration cycle 1, and the heating operation can be performed with energy saving.

  The controller sets the heat source switching water temperature to a high temperature when the outside air temperature is high, and sets the heating source switching water temperature to a low temperature when the outside air temperature is low. Therefore, when the outside air temperature is high, the heat absorption efficiency from the outside air of the refrigeration cycle 1 and the heat dissipation efficiency to the hot water are high, and when the outside air temperature is low, the heat absorption efficiency from the outside air of the refrigeration cycle 1 and the heat dissipation to the hot water. Since the efficiency is low, the sheathed heater 13 is used only when the efficiency of the refrigeration cycle 1 due to the outside air temperature is considerably low, thereby further saving energy.

  When switching from the refrigerant / warm water heat exchange path to the warm water heating path, the control unit switches the path to the warm water heating path after turning on the sheathed heater 13 for a predetermined time. Therefore, by switching the path after the temperature of the hot water in the sheathed heater 13 is warmed, the temperature of the hot water in the warm water cycle 10 can be prevented from being lowered at the time of path switching, and the temperature of the air supplied to the vehicle interior is temporarily decreased. Can be prevented.

  In the hot water cycle 10, the refrigerant / hot water heat exchanger 3 and the sheathed heater 13 are arranged in series with respect to the water pump 11.

  When the current vehicle room temperature is lower than the target vehicle room temperature, the target water temperature of the hot water cycle 10 is set higher according to the temperature difference between the current vehicle room temperature and the target vehicle room temperature. Therefore, since it is operated so that the water temperature of the hot water cycle 10 becomes a high water temperature, the vehicle room temperature can be quickly raised, and the immediate warming property is improved.

  When the temperature difference between the current vehicle room temperature and the target vehicle room temperature is large, the refrigeration cycle 1 or the sheathed heater 13 to be operated is operated at full power. Therefore, the vehicle room temperature can be raised quickly, and the immediate warming property is improved.

  When there is no temperature difference between the current vehicle room temperature and the target vehicle room temperature, the refrigeration cycle 1 or the sheathed heater 13 to be operated is operated with partial power that maintains the current vehicle room temperature. Therefore, maintaining the vehicle room temperature at the target vehicle room temperature can be performed without using wasted energy, resulting in energy saving.

  When there is no temperature difference between the current vehicle room temperature and the target vehicle room temperature, when the water temperature of the hot water cycle 10 is lower than the target vehicle room temperature, the partial power that maintains the current vehicle room temperature for the refrigeration cycle 1 or the sheathed heater 13 to be operated. When the water temperature of the hot water cycle 10 is higher than the target vehicle room temperature, the refrigeration cycle 1 or the sheathed heater 13 that was operating is turned off. Therefore, unnecessary (unnecessary) heating of the hot water in the hot water cycle 10 is prevented and energy saving is achieved.

(Second Embodiment)
FIG. 6 shows a second embodiment of the present invention. As shown in FIG. 6, the vehicle air conditioner according to the second embodiment is different from the first embodiment only in the configuration of the hot water cycle 10A and the path switching means 20A.

  That is, in the hot water cycle 10 </ b> A, the hot water passage portion 3 b of the refrigerant / hot water heat exchanger 3 and the sheathed heater 13 are arranged in parallel to the water pump 11.

  The path switching means 20A includes a third hot water on / off valve 25 that opens and closes an inlet path to the hot water passage portion 3b of the refrigerant / hot water heat exchanger 3, and a fourth hot water on / off valve 26 that opens and closes the inlet path to the sheathed heater 13. It has.

  By opening and closing the third hot water on-off valve 25 and the fourth hot water on-off valve 26, the hot water bypasses the sheathed heater 13 and passes through the hot water passage section 3b of the refrigerant / hot water heat exchanger 3, and the hot water It is possible to switch to a hot water heating path that bypasses the hot water passage portion 3 b of the refrigerant / hot water heat exchanger 3 and passes through the sheathed heater 13.

  Since the other configuration is the same as that of the first embodiment, the same components are denoted by the same reference numerals, and redundant description is omitted.

  Even in the second embodiment, the heating operation can be performed similarly to the first embodiment. The opening / closing control of the third hot water on / off valve 25 and the fourth hot water on / off valve 26 at that time is shown in the flow of FIGS.

  Accordingly, in the second embodiment, similarly to the first embodiment, the hot water cycle 10 is provided with another heating water heater (seeds heater 13) together with the heating unit of the refrigeration cycle 1, and heating operation is performed with energy saving. be able to.

  In the hot water cycle 10, the refrigerant / hot water heat exchanger 3 and the hot water heater are arranged in parallel to the water pump 11. Therefore, since no bypass path is required unlike the series connection, the structure of the hot water cycle 10 can be simplified as much as possible.

(Modification, other)
In 1st Embodiment and 2nd Embodiment, although the hot water heater different from the heating part of the refrigerating cycle 1 was the sheathed heater (electric type) 13, it is not limited to this, Kind (combustion type) , Waste heat utilizing heater, etc.). Further, the number of hot water heaters is not limited.

  In the first embodiment and the second embodiment, two-way valves (first hot water on-off valves 22, 25, second hot water on-off valves 24, 25) that close or open a passage (hot water main passage, bypass passage) through which hot water passes are provided. 26) is used, but a three-way valve may be used. Using a three-way valve is more effective in stopping the flow of wasted hot water. The two-way valve and the three-way valve may be electrically opened and closed based on the output signal of the water temperature sensor SE3 as in the first and second embodiments, but may be mechanically opened and closed depending on the water temperature. good.

  The vehicle air conditioner of the present invention is a device suitable for being mounted on an electric vehicle that does not have an internal combustion engine as a drive source, or a hybrid vehicle that has an internal combustion engine but does not always use the internal combustion engine when the vehicle is running. However, it is of course applicable to a vehicle having an internal combustion engine.

DESCRIPTION OF SYMBOLS 1 Refrigeration cycle 2 Compressor 3 Refrigerant / hot water heat exchanger 3a Refrigerant passage part 3b Hot water passage part 7 Outdoor heat exchanger 10, 10A Hot water cycle 11 Water pump 12 Heater core 13 Sheath heater (hot water heater)
20, 20A route switching means

Claims (9)

A compressor (2) that compresses the refrigerant, a refrigerant / hot water heat exchanger (3) that exchanges heat between the refrigerant compressed by the compressor (2) and hot water, and heat exchange using the refrigerant / hot water heat exchanger 3 A refrigeration cycle (1) having an outdoor heat exchanger (7) for exchanging heat between the generated refrigerant and the outside air;
A water pump (11) that circulates hot water heat-exchanged by the refrigerant / hot-water heat exchanger (3), and heat exchange between hot water circulated by the water pump (11) and air supplied to the passenger compartment. , A hot water cycle (12), which is provided separately from the heater core (12) for heating air and the refrigerant / hot water heat exchanger (3), and has a hot water heater (13) for heating hot water circulated by the water pump (11). 10), (10A),
The hot water of the hot water cycle (10), (10A) bypasses the hot water heater (13) and passes through the refrigerant / hot water heat exchanger (3), and the hot water is the refrigerant / hot water. Path switching means (20), (20A) for switching to a hot water heating path that bypasses the heat exchanger (3) and passes through the hot water heater (13);
If the current water temperature in the hot water cycle (10), (10A) is lower than the heat source switching water temperature, the route of the hot water cycle (10), (10A) is switched to the refrigerant / warm water heat exchange route; and When the refrigeration cycle (1) is driven and the current water temperature in the hot water cycle (10), (10A) is higher than the heating source switching water temperature, the path of the hot water cycle (10), (10A) is heated. Switching to a heating path and turning on the warm water heater (13). The vehicle air conditioner according to claim 1,
A vehicle air conditioner characterized in that when the outside air temperature is high, the heating source switching water temperature is set to a high temperature, and when the outside air temperature is low, the heating source switching water temperature is set to a low temperature. The vehicle air conditioner according to claim 1 or 2,
When switching from a refrigerant / warm water heat exchange path to a warm water heating path, the path is switched to the warm water heating path after the warm water heater (13) is turned on for a predetermined time. The vehicle air conditioner according to any one of claims 1 to 3,
The hot water cycle (10) is characterized in that the refrigerant / hot water heat exchanger (3) and the hot water heater (13) are arranged in series with the water pump (11). Air conditioner. The vehicle air conditioner according to any one of claims 1 to 3,
The warm water cycle (10A) is characterized in that the refrigerant / warm water heat exchanger (3) and the warm water heater (13) are arranged in parallel to the water pump (11). Air conditioner. The vehicle air conditioner according to any one of claims 1 to 5,
When the current vehicle room temperature is lower than the target vehicle room temperature, the target water temperature of the hot water cycle (10), (10A) is set high according to the magnitude of the temperature difference between the current vehicle room temperature and the target vehicle room temperature. A vehicle air conditioner. The vehicle air conditioner according to any one of claims 1 to 6,
An air conditioning apparatus for a vehicle, wherein when the temperature difference between the current vehicle room temperature and the target vehicle room temperature is large, the refrigeration cycle (1) or hot water heater (13) to be operated is operated at full power. The vehicle air conditioner according to any one of claims 1 to 6,
When there is no temperature difference between the current vehicle room temperature and the target vehicle room temperature, the refrigeration cycle (1) or hot water heater (13) to be operated is operated with partial power to maintain the current vehicle room temperature. Air conditioning equipment. The vehicle air conditioner according to any one of claims 1 to 6,
When there is no temperature difference between the current vehicle room temperature and the target vehicle room temperature, when the water temperature of the hot water cycle (10), (10A) is lower than the target vehicle room temperature, the refrigeration cycle (1) or hot water heater (13 ) Is operated with partial power to maintain the current vehicle room temperature, and when the water temperature of the hot water cycle (10), (10A) is higher than the target vehicle room temperature, the refrigeration cycle (1) or hot water heater (13) A vehicle air conditioner.

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