JP5098196B2 - Water cooling engine heat pump - Google Patents

Description

  The present invention relates to a water-cooled engine heat pump used as an outdoor unit such as an air conditioner.

A water-cooled engine heat pump that drives a compressor by a water-cooled engine has an advantage that the refrigerant can be heated using waste heat of the engine during heating operation. However, if heat is applied to the refrigerant too much than the cooling water, the cooling water may become too cold and the engine may be overcooled. As a result, problems such as a decrease in engine durability, an unstable combustion state, and an increase in loss horsepower are caused. The following documents are known as solutions for this.
Japanese Patent No. 2519409

In this document, a thermostat for stopping heat exchange in the waste heat recovery unit is provided in a low-temperature operation state where the engine coolant temperature is lower than a predetermined value.
In this conventional waste heat recovery device, when the engine coolant temperature is lower than a predetermined value, the waste heat of the engine is not utilized. For this reason, there has been a problem that the cooling water temperature does not reach a predetermined value for a while from the start of the engine, and the heat of the cooling water is not used and it takes time to start up in low temperature heating.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a water-cooled engine heat pump that solves the above-mentioned problems and that can use the heat of cooling water from the start of the engine and can quickly start up in low-temperature heating.

Means, actions and effects for solving the problems

The water-cooled engine heat pump of the present invention first has a water-cooled engine, a refrigerant compression compressor driven by the engine, a refrigerant heat exchanger, and a waste heat recovery device for transferring heat of the engine to the refrigerant. The waste heat recovery device is connected to a cooling water circuit for cooling the engine, a refrigerant circuit for circulating a refrigerant compressed by the compressor, the cooling water circuit, and the refrigerant circuit, and the heat of the cooling water is used as the refrigerant. A water-cooled engine heat pump having a waste heat recovery device for transmitting and a stop means for stopping the supply of the cooling water to the waste heat recovery device in a low temperature operation state where the temperature of the cooling water circulating through the cooling water circuit is lower than a predetermined value there, the cooling water circuit, that have a bypass circuit for water cooling water passing through the engine to the waste heat recovery unit to bypass the stop means.

  In the water-cooled engine heat pump of the present invention, since the bypass circuit is provided, the heat of the cooling water is transferred to the refrigerant even when the cooling water temperature is low when the engine is started and the heating is started. For this reason, it is possible to prevent the refrigerant low pressure (compressor suction side refrigerant pressure) from decreasing. If the compressor is rotated at a high speed when the refrigerant low pressure is too low, the system will stop abnormally at a low pressure. In order to avoid this, it is necessary to rotate the compressor at a low speed, so that the engine is rotated at the minimum speed. The operation when the refrigerant low pressure is excessively reduced is referred to as refrigerant low pressure avoidance. When the refrigerant is in a state of avoiding the low pressure, the engine is rotated at the minimum number of revolutions, so the rise in the coolant temperature is delayed. In the present invention, as described above, since the refrigerant low pressure can be prevented from being lowered, the refrigerant low pressure is not avoided, and the engine speed can be increased. As the engine speed increases, fuel consumption increases and the temperature of the cooling water rises quickly. When the temperature of the cooling water rises, the amount of heat transferred from the cooling water to the refrigerant increases, and the heating capacity increases. For this reason, the rise at the time of heating low temperature is good.

  The water-cooled engine heat pump of the present invention has a water-cooled engine, a refrigerant compression compressor driven by the engine, a refrigerant heat exchanger, and a waste heat recovery device for transferring the heat of the engine to the refrigerant.

  As the water-cooled engine, a water-cooled internal combustion engine, specifically, a water-cooled diesel engine, a water-cooled gasoline engine, a water-cooled gas engine, or the like is used. The internal combustion engine is controlled so that the rotation speed is kept low when the gas pressure of the refrigerant is equal to or lower than a predetermined value. The water-cooled engine may not only cool the cylinder block of the engine but also cool an exhaust gas heat exchanger and / or a manifold cooling device that takes the heat of the exhaust gas into the cooling water.

  The compressor for compressing the refrigerant corresponds to the heart of the heat pump. By adiabatically compressing the refrigerant, the gas pressure of the refrigerant increases and the temperature of the refrigerant increases. The heat exchanger for refrigerant transfers heat of the refrigerant to a room to be heated. During heating, the heat of the refrigerant that is adiabatically compressed by the compressor and becomes high temperature is radiated to the air in the room to be heated or the water to heat the air in the room.

  The waste heat recovery unit transfers the heat of the cooling water of the water-cooled internal combustion engine to the refrigerant. By this waste heat recovery device, the heat of the cooling water is transmitted to the refrigerant, and the temperature of the cooling water is lowered. Conversely, the temperature of the refrigerant that receives heat increases.

  The refrigerant heat exchanger may be used as an indoor heat exchanger used for heating a specific room or the like and for heating and cooling.

  In addition to the refrigerant heat exchanger, an external heat exchanger that exchanges heat between an external heat source and the refrigerant may be used.

  The waste heat recovery apparatus for a water-cooled engine heat pump according to the present invention includes a cooling water circuit for cooling an engine, a refrigerant circuit for circulating a refrigerant compressed by a compressor, and the above-described waste connected to the cooling water circuit and the refrigerant circuit. A heat recovery unit, and a stop unit for stopping the water supply to the waste heat recovery unit in a low temperature operation state where the temperature of the cooling water circulating in the cooling water circuit is lower than a predetermined value. Furthermore, the cooling water circuit has a bypass circuit that bypasses the stopping means and sends the cooling water to the waste heat recovery device.

  The stopping means is the same as that provided in the conventional water-cooled engine heat pump, and stops the cooling water flowing through the waste heat recovery unit when the temperature of the cooling water is low. As a result, heat transferred from the cooling water to the refrigerant is eliminated, and the function of the waste heat recovery unit is stopped. That is, the stop means stops the function of the waste heat recovery unit and functions to wait for the temperature of the cooling water to be warmed by driving the engine.

  As a means for stopping, as in the past, use a switching valve such as a thermostat valve that closes the cooling passage that flows to the waste heat recovery unit when the temperature of the cooling water is a predetermined low temperature, or an electromagnetic valve that has a cooling water sensor. Can do.

  The waste heat recovery apparatus for the water-cooled engine heat pump of the present invention has a bypass circuit that bypasses the stopping means. For this reason, the engine cooling water always flows to the waste heat recovery device by the bypass circuit. When the temperature of the cooling water reaches a predetermined value or more, the stopping means is released and a large amount of cooling water flows into the waste heat recovery device. Of course, the cooling water also flows from the bypass circuit to the waste heat recovery unit.

  The bypass circuit preferably bypasses a part of the cooling water. For this reason, it is preferable to have a channel resistance that regulates the amount of water so that a large amount of cooling water is not bypassed. As a result, the engine coolant can be prevented from becoming too cold and the engine from being overcooled. In that case, it is preferable to set the channel resistance so that the flow rate through the bypass circuit in the low temperature operation state in which the temperature of the cooling water is lower than a predetermined value is 2 to 50%, more preferably 5 to 5%. 30%, more preferably 5 to 15%.

  The stopping means according to the present invention is a low-temperature valve that opens and closes the valve at a predetermined low temperature, and the cooling water circuit according to the present invention further opens and closes the radiator and the supply of cooling water to the radiator at a predetermined high temperature higher than the predetermined low temperature. And a high temperature valve for opening and closing the valve.

  When the cooling water is lower than a predetermined low temperature, the low temperature valve serving as the stopping means of the present invention is closed, and the cooling water does not flow into the waste heat recovery device via the low temperature valve. However, a part of the cooling water flows into the waste heat recovery device through the bypass circuit. When the cooling water is lower than the predetermined low temperature, the cooling water is naturally lower than the predetermined high temperature, and the cooling water does not flow into the radiator.

  When the cooling water temperature is higher than the predetermined low temperature and lower than the predetermined high temperature, the cooling water flows into the waste heat recovery device from both the low temperature valve and the bypass circuit. In this case, the cooling water does not flow into the radiator.

  When the cooling water temperature is higher than a predetermined high temperature, both the low temperature valve and the high temperature valve are opened. In this case, the cooling water flows into the waste heat recovery unit through the bypass circuit and the low temperature valve, and the cooling water flows into the radiator through the high temperature valve.

  The low-temperature valve and the high-temperature valve according to the present invention do not mean specific individual on-off valves, and the low-temperature valve means valve means having a function of opening and closing cooling water flowing into the waste heat recovery device. Therefore, the cryogenic valve may actually be constituted by one on-off valve or may be constituted by two or more plural on-off valves. Similarly, the high temperature valve means a valve means having a function of opening and closing cooling water flowing into the radiator, and the high temperature valve is actually composed of two or more plural on / off valves even if it is composed of one on / off valve. It may be possible. Furthermore, the low temperature valve may be configured by a switching valve that switches a passage through which cooling water flows. For example, as a low-temperature valve, a full-volume intake port (suction port) that sucks the entire amount of cooling water, and a low-temperature discharge port (low-temperature port) that discharges the entire amount of cooling water drawn from the full-volume intake port at a temperature lower than the first temperature. And what has a high temperature discharge port (high temperature port) which discharges the whole quantity of the cooling water suck | inhaled from the whole amount suction port at the temperature more than 2nd temperature which is more than said 1st temperature is illustrated. Further, as a low temperature valve, a total discharge port (discharge port) that discharges the entire amount of cooling water, a low temperature intake port (cold port) that sucks the entire amount of cooling water discharged from the full discharge port at a temperature lower than the first temperature, and Examples include a high-temperature suction port (high-temperature port) that sucks the entire amount of cooling water discharged from the entire discharge port at a temperature equal to or higher than the second temperature that is equal to or higher than the first temperature. The first temperature and the second temperature may be the same temperature. In this case, the passage (cooling port side or high temperature port side) through which the cooling water flows is completely switched with the temperature as a boundary. A high temperature valve may also be comprised with the switching valve which switches the channel | path through which cooling water flows. In the case of a high temperature valve, the same thing as a low temperature valve is illustrated except that the third temperature corresponds to the first temperature of the low temperature valve and the fourth temperature corresponds to the second temperature of the low temperature valve. The The third temperature and the fourth temperature are set higher than any of the first temperature and the second temperature.

  As such an on-off valve, a conventionally known thermostat valve, an electromagnetic valve provided with a temperature sensor, or the like can be employed.

  A specific cooling water circuit can be shown in FIGS.

  The cooling water circuit shown in FIG. 1 includes a supply passage 11 that connects the cooling water discharge port 25 of the engine 2 and the total amount suction port 610 of the low temperature valve 61, the low temperature discharge port 614 of the low temperature valve 61, and the cooling water suction of the engine 2. The recovery passage 12 connecting the port 26, the second supply passage 110 connecting the high temperature discharge port 615 of the low temperature valve 61 and the full amount suction port 620 of the high temperature valve 62, and the low temperature exhaust of the high temperature valve 62 through the waste heat recovery device 64. The waste heat recovery passage 13 connecting the outlet 624 and the recovery passage 12, the radiator passage 14 passing through the radiator 63 and connecting the high temperature outlet 62 625 of the high temperature valve 62 and the recovery passage 12, the supply passage 11 and the waste heat recovery device 64. The bypass passage 15 is connected to the supply port 641.

  The low-temperature valve 61 includes a full-volume intake port 610 for sucking cooling water, a low-temperature discharge port 614 for discharging the total amount of cooling water drawn from the full-volume intake port 610 at a temperature lower than the first temperature, and a first temperature. A high-temperature discharge port 615 that discharges the entire amount of cooling water sucked from the entire amount intake port 610 at a temperature equal to or higher than the high second temperature, and the high-temperature valve 62 includes a total amount intake port 620 that intakes cooling water, A low temperature discharge port 624 that discharges the entire amount of cooling water sucked from the whole amount suction port 620 at a temperature lower than the third temperature, and a full amount sucked from the full amount suction port 620 at a temperature that is higher than the third temperature and equal to or higher than the fourth temperature. And a high-temperature discharge port 625 for discharging the entire amount of cooling water. Here, the third and fourth temperatures (predetermined high temperature) are set higher than the first and second temperatures (predetermined low temperature). That is, the third temperature is set higher than the second temperature.

  In the cooling water circuit, when the water pump 65 of the engine 2 is operating, the cooling water flows into the waste heat recovery device 64 through the bypass passage 15 regardless of the temperature of the cooling water. When the cooling water temperature is higher than a predetermined low temperature and lower than a predetermined high temperature (when higher than the second temperature and lower than the third temperature), the waste heat recovery passage 13 passes through the supply passage 11 and the second supply passage 110. The waste heat recovery unit 64 receives cooling water from both the bypass passage 15 and the waste heat recovery passage 13. However, the radiator passage 14 is closed by the high temperature valve 62, and the cooling water does not flow through the radiator 63. When the temperature of the cooling water is lower than a predetermined value (first temperature), the entire amount of the cooling water sucked into the suction port 610 of the low temperature valve 61 is discharged from the low temperature port 611 and the cooling water is bypassed (bypass circuit). ) It flows into the waste heat recovery unit 64 through only 15. That is, when there is no bypass passage 15, the water supply to the waste heat recovery device 64 is stopped. Therefore, the low-temperature valve 61 serves as a stopping means for stopping the water supply to the waste heat recovery unit 64 in a low-temperature operation state where the temperature of the cooling water is lower than a predetermined value (first temperature).

  The cooling water circuit shown in FIG. 2 includes a supply passage 11 that connects the cooling water discharge port 25 of the engine 2 and the total amount suction port 610 of the low temperature valve 61, a low temperature discharge port 614 of the low temperature valve 61, and a cooling water suction port of the engine 2. 26, the waste heat recovery passage 13 connecting the high temperature exhaust port 615 of the low temperature valve 61 and the low temperature intake port 621 of the high temperature valve 62 through the waste heat recovery device 64, and the low temperature valve 61 passing through the radiator 63. The radiator passage 14 connecting the high temperature discharge port 615 and the high temperature suction port 622 of the high temperature valve 62, the second recovery passage 120 connecting the total amount discharge port 623 of the high temperature valve 62 and the recovery passage 12, the supply passage 11 and the waste heat. The first bypass passage 15 connecting the supply port 641 of the recovery device 64, the outlet 642 of the waste heat recovery device 64, and the second bypass passage 150 connecting either the recovery passage 12 or the second recovery passage 120. .

  The low-temperature valve 61 includes a full-volume intake port 610 for sucking cooling water, a low-temperature discharge port 614 for discharging the total amount of cooling water drawn from the full-volume intake port 610 at a temperature lower than the first temperature, and a first temperature. A high-temperature discharge port 615 that discharges the entire amount of cooling water sucked from the entire amount intake port 610 at a temperature equal to or higher than the high second temperature, and the high-temperature valve 62 includes a total amount discharge port 623 that discharges the cooling water, A low-temperature suction port 621 that sucks the entire amount of cooling water discharged from the full amount discharge port 623 at a temperature lower than the third temperature, and a full amount discharge from the full amount discharge port 623 at a temperature equal to or higher than the fourth temperature that is equal to or higher than the third temperature. And a high-temperature suction port 622 for sucking the entire amount of cooling water. Here, the third and fourth temperatures (predetermined high temperature) are set higher than the first and second temperatures (predetermined low temperature). That is, the third temperature is set higher than the second temperature.

  The cooling water circuit of FIG. 2 differs from the cooling water circuit of FIG. 1 in the usage mode of the low temperature valve 61 and the high temperature valve 62. However, the flow of the cooling water flowing to the waste heat recovery unit 64 and the radiator 63 depending on the temperature of the cooling water is the same as that of the cooling water circuit of FIG. That is, in the cooling water circuit, when the water pump 65 of the engine 2 is operating, the cooling water passes through the first bypass passage (bypass circuit) 15 to recover waste heat regardless of the temperature of the cooling water. Flows into the vessel 64. When the cooling water temperature is higher than a predetermined low temperature and lower than a predetermined high temperature (when higher than the second temperature and lower than the third temperature), the waste heat recovery device 64 passes through the supply passage 11 and the waste heat recovery passage 13. Flow into. However, the radiator passage 14 is closed by the high temperature valve 62, and the cooling water does not flow through the radiator 63. When the temperature of the cooling water is lower than a predetermined value (first temperature), the entire amount of cooling water sucked into the entire amount suction port 610 of the low temperature valve 61 is discharged from the low temperature discharge port 614, and the cooling water is bypassed by the bypass passage 15. Only into the waste heat recovery unit 64. That is, when there is no bypass passage 15, the water supply to the waste heat recovery device 64 is stopped. Therefore, the low-temperature valve 61 serves as a stopping means for stopping the water supply to the waste heat recovery unit 64 in a low-temperature operation state where the temperature of the cooling water is lower than a predetermined value (first temperature).

  The cooling water circuit of FIG. 3 includes a supply passage 11 that connects the cooling water discharge port 25 of the engine 2 and the full amount intake port 620 of the high temperature valve 62, the low temperature discharge port 624 of the high temperature valve 62, and the full amount intake port 610 of the low temperature valve 61. , A recovery passage 12 connecting the low-temperature discharge port 614 of the low-temperature valve 61 and the cooling water intake port 26 of the engine 2, and the high-temperature discharge port 615 of the low-temperature valve 61 through the waste heat recovery device 64. Waste heat recovery passage 13 connecting the recovery passage 12 and the radiator passage 14 passing through the radiator 63 and connecting the high temperature discharge port 625 of the high temperature valve 62 and the recovery passage 12, and the supply passage 11 and the supply port of the waste heat recovery device 64 641 and a bypass passage 15 connecting to 641.

  The low-temperature valve 61 includes a total amount suction port 610 for sucking cooling water, a low temperature discharge port 614 for discharging the total amount of cooling water sucked from the full amount suction port 610 at a temperature lower than the first temperature, and a temperature equal to or higher than the first temperature. And a high temperature discharge port 615 that discharges the entire amount of cooling water sucked from the whole amount suction port 611 at a temperature equal to or higher than the second temperature, and the high temperature valve 62 includes a full amount suction port 620 that sucks the cooling water, and The low-temperature discharge port 624 that discharges the entire amount of cooling water sucked from the full amount intake port 620 at a temperature lower than the third temperature, and the full amount intake port 620 at a temperature equal to or higher than the fourth temperature that is equal to or higher than the third temperature. And a high-temperature discharge port 625 for discharging the entire amount of the sucked cooling water.

  The cooling water circuit of FIG. 3 differs from the cooling water circuit of FIGS. 1 and 2 in the usage mode of the low temperature valve 61 and the high temperature valve 62. However, the flow of the cooling water flowing through the waste heat recovery device 64 and the radiator 63 depending on the temperature of the cooling water is the same as that of the cooling water circuit of FIGS. That is, in the cooling water circuit, when the water pump 65 of the engine 2 is operating, the cooling water passes through the bypass passage (bypass circuit) 15 and the waste heat recovery unit 64 regardless of the temperature of the cooling water. Flow into. When the cooling water temperature is higher than a predetermined low temperature and lower than a predetermined high temperature (when higher than the second temperature and lower than the third temperature), the waste heat recovery passage 13 passes through the supply passage 11 and the second supply passage 110. The waste heat recovery unit 64 receives cooling water from both the bypass passage 15 and the waste heat recovery passage 13. However, the radiator passage 14 is closed by the high temperature valve 62, and the cooling water does not flow through the radiator 63. When the temperature of the cooling water is lower than a predetermined value (first temperature), the entire amount of cooling water sucked into the entire amount suction port 610 of the low temperature valve 61 is discharged from the low temperature discharge port 614, and the cooling water is bypassed by the bypass passage 15. Only into the waste heat recovery unit 64. That is, when there is no bypass passage 15, the water supply to the waste heat recovery device 64 is stopped. Therefore, the low-temperature valve 61 serves as a stopping means for stopping the water supply to the waste heat recovery unit 64 in a low-temperature operation state where the temperature of the cooling water is lower than a predetermined value (first temperature).

  The cooling water circuit shown in FIG. 4 includes a supply passage 11 that connects the cooling water discharge port 25 of the engine 2 and the full amount suction port 620 of the high temperature valve 62, a low temperature discharge port 624 of the high temperature valve 62, and a low temperature suction port of the low temperature valve 61. 611, the second supply passage 110 connecting 611, the recovery passage 12 connecting the total amount discharge port 613 of the low temperature valve 61 and the cooling water intake port 26 of the engine 2, the waste heat recovery device 64 and the second supply passage 110 and the low temperature. A waste heat recovery passage 13 connecting the high-temperature suction port 612 of the valve 61, a radiator passage 14 passing through the radiator 63 and connecting the high-temperature discharge port 625 of the high-temperature valve 62 and the high-temperature suction port 612 of the low-temperature valve 61, and the supply passage 11 The first bypass passage 15 is connected to the second supply passage 110, and the second bypass passage 150 is connected to the waste heat recovery passage 13 and the recovery passage 12 on the downstream side of the waste heat recovery device 64.

  The low temperature valve 61 includes a total amount discharge port 613 that discharges cooling water, a low temperature intake port 611 that sucks the entire amount of cooling water discharged from the full amount discharge port 613 at a temperature lower than the first temperature, and a temperature higher than the first temperature. A high temperature suction port 612 that sucks the entire amount of cooling water discharged from the full amount discharge port 613 at a temperature equal to or higher than a second temperature, and the high temperature valve 62 includes a full amount suction port 620 for sucking cooling water, A low temperature discharge port 624 that discharges the entire amount of cooling water sucked from the full amount suction port 620 at a temperature lower than the temperature 3, and a full amount sucked from the full amount suction port 620 at a temperature equal to or higher than the fourth temperature that is equal to or higher than the third temperature. And a high-temperature discharge port 625 for discharging the entire amount of cooling water.

  The cooling water circuit of FIG. 4 differs from the cooling water circuit of FIGS. 1 to 3 in the usage mode of the low temperature valve 61 and the high temperature valve 62. However, the flow of the cooling water flowing through the waste heat recovery device 64 and the radiator 63 depending on the temperature of the cooling water is the same as the cooling water circuit of FIGS. That is, in the cooling water circuit, when the water pump 65 of the engine 2 is operating, the cooling water is supplied to the first bypass passage 15 and the second bypass passage (bypass circuit) 150 regardless of the coolant temperature. Through the waste heat recovery unit 64. When the cooling water temperature is higher than a predetermined low temperature and lower than a predetermined high temperature (when higher than the second temperature and lower than the third temperature), the waste heat recovery device 64 passes through the supply passage 11 and the waste heat recovery passage 13. Flow into. However, the radiator passage 14 is closed by the high temperature valve 62, and the cooling water does not flow through the radiator 63. When the temperature of the cooling water is lower than a predetermined value (first temperature), the high-temperature intake port 612 of the low-temperature valve 61 is blocked, and only the second bypass passage 150 flows into the waste heat recovery passage 13. It is sent to the recovery passageway 12 through. That is, when there is no second bypass passage 150, the cooling water supply to the waste heat recovery unit 64 is stopped. Therefore, the low-temperature valve 61 serves as a stopping means for stopping the water supply to the waste heat recovery unit 64 in a low-temperature operation state where the temperature of the cooling water is lower than a predetermined value (first temperature).

  The cooling water circuit shown in FIG. 5 includes a supply passage 11 that connects the cooling water discharge port 25 of the engine 2 and the low temperature suction port 611 of the low temperature valve 61, the full amount discharge port 613 of the low temperature valve 61, and the cooling water suction port of the engine 2. 26, the waste heat recovery passage 13 connecting the supply passage 11 and the low temperature inlet 621 of the high temperature valve 62 through the waste heat recovery device 64, and the supply passage 11 and the high temperature valve 62 through the radiator 63. The radiator passage 14 connecting the high temperature intake port 622, the second recovery passage 120 connecting the total amount discharge port 623 of the high temperature valve 62 and the high temperature intake port 612 of the low temperature valve 61, and the waste heat downstream of the waste heat recovery device 64. The bypass passage 15 connects the recovery passage 13 and the recovery passage 12.

  The low temperature valve 61 includes a total amount discharge port 613 that discharges cooling water, a low temperature intake port 611 that sucks the entire amount of cooling water discharged from the full amount discharge port 613 at a temperature lower than the first temperature, and a temperature higher than the first temperature. A high temperature suction port 612 that sucks the entire amount of cooling water discharged from the total amount discharge port 613 at a temperature equal to or higher than a second temperature, and the high temperature valve 62 includes a total amount discharge port 623 for discharging the cooling water, A low-temperature suction port 621 for sucking the entire amount of cooling water discharged from the total amount discharge port 623 at a temperature lower than the temperature 3, and cooling discharged from the full amount discharge port 623 at a temperature equal to or higher than the fourth temperature which is equal to or higher than the third temperature. And a high-temperature suction port 622 for sucking the entire amount of water.

  The cooling water circuit of FIG. 5 differs from the cooling water circuit of FIGS. 1 to 4 in the usage mode of the low temperature valve 61 and the high temperature valve 62. However, the flow of the cooling water flowing through the waste heat recovery device 64 and the radiator 63 depending on the temperature of the cooling water is the same as the cooling water circuit of FIGS. That is, in the cooling water circuit, when the water pump 65 of the engine 2 is operating, the cooling water that has passed through the waste heat recovery device 64 is bypassed regardless of the temperature of the cooling water (bypass circuit). Flows through 15. When the cooling water temperature is higher than a predetermined low temperature and lower than a predetermined high temperature (when it is higher than the second temperature and lower than the third temperature), the cooling water that has passed through the waste heat recovery unit 64 passes through the waste heat recovery passage 13 and the It also flows through the second collection passage 120. However, the radiator passage 14 is closed by the high temperature valve 62, and the cooling water does not flow through the radiator 63. When the temperature of the cooling water is lower than a predetermined value (first temperature), the high temperature inlet 612 of the low temperature valve 61 is shut off, and the cooling water flowing into the waste heat recovery passage 13 passes only the bypass passage 15. To the recovery passageway 12. That is, when there is no bypass passage 15, the water supply to the waste heat recovery device 64 is stopped. Therefore, the low-temperature valve 61 serves as a stopping means for stopping the water supply to the waste heat recovery unit 64 in a low-temperature operation state where the temperature of the cooling water is lower than a predetermined value (first temperature).

  The cooling water circuit shown in FIG. 6 includes a supply passage 11 connecting the cooling water discharge port 25 of the engine 2 and the low temperature intake port 611 of the low temperature valve 61, and a first connection port 620 connecting the supply passage 11 and the full amount intake port 620 of the high temperature valve 62. The two supply passages 110, the recovery passage 12 connecting the entire discharge port 613 of the low temperature valve 61 and the cooling water intake port 26 of the engine 2, the low temperature discharge port 624 of the high temperature valve 62 and the low temperature valve 61 passing through the waste heat recovery device 64. The waste heat recovery passage 13 connecting the high temperature suction port 612, the radiator passage 14 passing through the radiator 63 and connecting the high temperature discharge port 625 of the high temperature valve 62 and the high temperature suction port 612 of the low temperature valve 61, and the supply passage 11 and the waste heat. The first bypass passage 15 connecting the waste heat recovery passage 13 upstream of the recovery device 64 and the second bypass passage 150 connecting the recovery heat passage 15 and the waste heat recovery passage 15 downstream of the waste heat recovery device 64. Has been.

  The low temperature valve 61 includes a total amount discharge port 613 that discharges cooling water, a low temperature intake port 611 that sucks the entire amount of cooling water discharged from the full amount discharge port 613 at a temperature lower than the first temperature, and a temperature higher than the first temperature. A high temperature suction port 612 that sucks the entire amount of cooling water discharged from the full amount discharge port 613 at a temperature equal to or higher than a second temperature, and the high temperature valve 62 includes a full amount suction port 620 for sucking cooling water, A low temperature discharge port 624 that discharges the entire amount of cooling water sucked from the full amount suction port 620 at a temperature lower than the temperature 3, and a full amount sucked from the full amount suction port 620 at a temperature equal to or higher than the fourth temperature that is equal to or higher than the third temperature. And a high-temperature discharge port 625 for discharging the entire amount of cooling water.

  The cooling water circuit of FIG. 6 differs from the cooling water circuit of FIGS. 1 to 5 in the usage mode of the low temperature valve 61 and the high temperature valve 62. However, the flow of the cooling water flowing through the waste heat recovery device 64 and the radiator 63 depending on the temperature of the cooling water is the same as the cooling water circuit of FIGS. That is, in the cooling water circuit, when the water pump 65 of the engine 2 is operating, the cooling water is supplied to the first bypass passage 15 and the second bypass passage (bypass circuit) 150 regardless of the coolant temperature. Through the waste heat recovery unit 64. When the cooling water temperature is higher than a predetermined low temperature and lower than a predetermined high temperature (when it is higher than the second temperature and lower than the third temperature), it passes through the second supply passage 110 and the waste heat recovery passage 13 to recover waste heat. Flows into the vessel 64. However, the radiator passage 14 is closed by the high temperature valve 62, and the cooling water does not flow through the radiator 63. When the temperature of the cooling water is lower than a predetermined value (first temperature), the high-temperature intake port 612 of the low-temperature valve 61 is blocked, and only the second bypass passage 150 flows into the waste heat recovery passage 13. It is sent to the recovery passageway 12 through. That is, when there is no second bypass passage 150, the cooling water supply to the waste heat recovery unit 64 is stopped. Therefore, the low-temperature valve 61 serves as a stopping means for stopping the water supply to the waste heat recovery unit 64 in a low-temperature operation state where the temperature of the cooling water is lower than a predetermined value (first temperature).

  The cooling water circuit shown in FIG. 7 includes a supply passage 11 that connects the cooling water discharge port 25 of the engine 2 and the low temperature suction port 611 of the low temperature valve 61, the total amount discharge port 613 of the low temperature valve 61, and the low temperature suction port of the high temperature valve 62. A second recovery passage 120 that connects 621, a recovery passage 12 that connects the total amount discharge port 623 of the high temperature valve 62 and the cooling water intake port 26 of the engine 2, a waste heat recovery device 64, and the supply passage 11 and the low temperature valve 61. Waste heat recovery passage 13 connecting the high temperature suction port 612, the radiator passage 14 passing through the radiator 63 and connecting the supply passage 11 and the high temperature suction port 622 of the high temperature valve 62, and waste heat downstream of the waste heat recovery device 64. The bypass passage 15 connects the recovery passage 13 and the recovery passage 12.

  The low temperature valve 61 includes a total amount discharge port 613 that discharges cooling water, a low temperature intake port 611 that sucks the entire amount of cooling water discharged from the full amount discharge port 613 at a temperature lower than the first temperature, and a temperature higher than the first temperature. A high temperature suction port 612 that sucks the entire amount of cooling water discharged from the total amount discharge port 613 at a temperature equal to or higher than a second temperature, and the high temperature valve 62 includes a total amount discharge port 623 for discharging the cooling water, A low-temperature suction port 621 for sucking the entire amount of cooling water discharged from the total amount discharge port 623 at a temperature lower than the temperature 3, and cooling discharged from the full amount discharge port 623 at a temperature equal to or higher than the fourth temperature which is equal to or higher than the third temperature. And a high-temperature suction port 622 for sucking the entire amount of water.

  The cooling water circuit of FIG. 7 differs from the cooling water circuit of FIGS. 1 to 6 in the usage mode of the low temperature valve 61 and the high temperature valve 62. However, the flow of the cooling water flowing through the waste heat recovery device 64 and the radiator 63 depending on the temperature of the cooling water is the same as the cooling water circuit of FIGS. That is, in the cooling water circuit, when the water pump 65 of the engine 2 is operating, the cooling water is discarded through the supply passage 11 and the bypass passage (bypass circuit) 15 regardless of the temperature of the cooling water. It flows through the heat recovery unit 64. When the cooling water temperature is higher than a predetermined low temperature and lower than a predetermined high temperature (when it is higher than the second temperature and lower than the third temperature), it passes through the supply passage 11, the waste heat recovery passage 13, and the second recovery passage 120. And flows through the waste heat recovery unit 64. However, the radiator passage 14 is closed by the high temperature valve 62, and the cooling water does not flow through the radiator 63. When the temperature of the cooling water is lower than a predetermined value (first temperature), the high temperature inlet 612 of the low temperature valve 61 is shut off, and the cooling water flowing into the waste heat recovery passage 13 passes only the bypass passage 15. To the recovery passageway 12. That is, when there is no bypass passage 15, the water supply to the waste heat recovery device 64 is stopped. Therefore, the low-temperature valve 61 serves as a stopping means for stopping the water supply to the waste heat recovery unit 64 in a low-temperature operation state where the temperature of the cooling water is lower than a predetermined value (first temperature).

  The cooling water circuit shown in FIG. 8 includes a supply passage 11 that connects the cooling water discharge port 25 of the engine 2 and the total amount suction port 610 of the low temperature valve 61, a low temperature discharge port 614 of the low temperature valve 61, and a cooling water suction port of the engine 2. 26, the waste heat recovery passage 13 connecting the supply passage 11 and the low temperature inlet 621 of the high temperature valve 62 through the waste heat recovery device 64, and the supply passage 11 and the high temperature valve 62 through the radiator 63. The radiator passage 14 connecting the high temperature suction port 622, the second recovery passage 120 connecting the total discharge port 623 of the high temperature valve 62 and the recovery passage 12, the waste heat recovery upstream of the supply passage 11 and the waste heat recovery unit 64. The first bypass passage 15 connecting the passage 13 and the second bypass passage 150 connecting the waste heat recovery passage 13 and the recovery passage 12 on the downstream side of the waste heat recovery device 64 are configured.

  The low-temperature valve 61 includes a total amount suction port 610 for sucking cooling water, a low temperature discharge port 614 for discharging the total amount of cooling water sucked from the full amount suction port 610 at a temperature lower than the first temperature, and a temperature equal to or higher than the first temperature. A high temperature discharge port 615 that discharges the entire amount of cooling water sucked from the entire amount suction port 610 at a temperature equal to or higher than the second temperature, and the high temperature valve 62 includes a total amount discharge port 623 that discharges the cooling water, The low temperature suction port 621 for sucking the entire amount of cooling water discharged from the total amount discharge port 623 at a temperature lower than the third temperature, and the full amount discharge from the total amount discharge port 623 at a temperature equal to or higher than the fourth temperature which is equal to or higher than the third temperature. And a high-temperature suction port 622 for sucking the entire amount of cooling water.

  The cooling water circuit of FIG. 8 differs from the cooling water circuit of FIGS. 1 to 7 in the usage mode of the low temperature valve 61 and the high temperature valve 62. However, the flow of the cooling water flowing through the waste heat recovery device 64 and the radiator 63 depending on the temperature of the cooling water is the same as the cooling water circuit of FIGS. That is, in the cooling water circuit, when the water pump 65 of the engine 2 is operating, the cooling water passes through the supply passage 11 and the first bypass passage (bypass circuit) 15 regardless of the temperature of the cooling water. And flows into the waste heat recovery unit 64. When the cooling water temperature is higher than a predetermined low temperature and lower than a predetermined high temperature (when it is higher than the second temperature and lower than the third temperature), the waste heat recovery device 64 is passed through the supply passage 11 and the waste heat recovery passage 13. Flowing. However, the radiator passage 14 is closed by the high temperature valve 62, and the cooling water does not flow through the radiator 63. When the temperature of the cooling water is lower than the predetermined value (first temperature), the high temperature discharge port 615 of the low temperature valve 61 is shut off, and the cooling water flows into the waste heat recovery device 64 only through the bypass passage 15. . That is, when there is no bypass passage 15, the water supply to the waste heat recovery device 64 is stopped. Therefore, the low-temperature valve 61 serves as a stopping means for stopping the water supply to the waste heat recovery unit 64 in a low-temperature operation state where the temperature of the cooling water is lower than a predetermined value (first temperature).

  Examples of the water-cooled engine heat pump of the present invention will be described below.

  A basic configuration diagram of the water-cooled engine heat pump of the present embodiment is shown in FIG. The water-cooled engine heat pump includes a water-cooled gas engine 2, a cooling water circuit 1 that cools the engine 2, two compressors 3 driven by the engine 2, and a refrigerant circuit 4 through which refrigerant compressed by the compressor 3 flows. Consists of.

  The gas engine 2 uses natural gas having a cylinder volume of 950 cc as a fuel, and includes an output pulley 21, a manifold cooling device 22, an exhaust gas heat exchanger 23, and an exhaust pipe 24. The gas engine 2 has a control unit that lowers the rotational speed of the gas engine 2 when the temperature of the refrigerant in the refrigerant circuit 4 described later is low.

  The cooling water circuit 1 connects the low temperature valve 61, the high temperature valve 62, the radiator 63, the waste heat recovery device 64, the water pump 65, the pressure cap 67, the reserve 68, the manifold cooling device 22, and the exhaust gas heat exchanger 23. . The low-temperature valve 61 includes a full-volume intake port 610 for sucking cooling water, a low-temperature discharge port 614 for discharging the total amount of cooling water drawn from the full-volume intake port 610 at a temperature lower than the first temperature, and a first temperature. And a high-temperature discharge port 615 that discharges the entire amount of cooling water sucked from the whole amount suction port 610 at a temperature equal to or higher than the second high temperature. The high temperature valve 62 includes a total amount suction port 620 for sucking cooling water, a low temperature discharge port 624 for discharging the entire amount of cooling water sucked from the full amount suction port 620 at a temperature lower than the third temperature, and a third temperature. And a high-temperature discharge port 625 for discharging the entire amount of cooling water sucked from the entire amount suction port 620 at a temperature equal to or higher than the high fourth temperature. As a circuit, the supply passage 11 connecting the cooling water discharge port 25 of the gas engine 2 and the total amount suction port 610 of the low temperature valve 61, the low temperature discharge port 614 of the low temperature valve 61, and the cooling water suction port of the gas engine 2 (see FIG. (Not shown), the second supply passage 110 connecting the high-temperature discharge port 615 of the low-temperature valve 61 and the full-volume intake port 620 of the high-temperature valve 62, and the low temperature of the high-temperature valve 62 through the waste heat recovery device 64. The waste heat recovery passage 13 connecting the exhaust port 624 and the recovery passage 12, the radiator passage 14 connecting the high temperature exhaust port 625 of the high temperature valve 62 and the recovery passage 12 through the radiator 63, and the recovery passage 12 via the pressure cap 67. And the reserve passage 18 connecting the reserve 68 and the bypass passage 15 connecting the supply passage 11 and the supply port 641 of the waste heat recovery device 64. A water passage resistance 16 is provided in the bypass passage 15. The channel resistance 16 is configured so that the flow rate flowing through the bypass circuit 15 is the total flow rate (the flow rate sent from the cooling water discharge port 25 of the engine 2) in a low temperature operation state where the temperature of the cooling water is lower than a predetermined value (first temperature). ) To 10%.

  The low-temperature valve 61 and the high-temperature valve 62 are both thermostat valves, and the thermostat is heated or cooled by the temperature of the cooling water to thermally expand or contract to drive the valves. The first temperature is set to 60 ° C., the second temperature is set to 65 ° C., the third temperature is set to 70 ° C., and the fourth temperature is set to 75 ° C. That is, the third and fourth temperatures (predetermined high temperature) are set higher than the first and second temperatures (predetermined low temperature). That is, the third temperature is set higher than the second temperature.

  The low temperature valve 61 opens and communicates the full amount suction port 610 and the low temperature discharge port 614 at a cooling water temperature lower than 60 ° C., and closes the full amount suction port 610 and the high temperature discharge port 615. In this state, the entire amount of cooling water sucked from the entire amount suction port 610 flows to the low temperature discharge port 614. When the cooling water temperature reaches 60 ° C. or higher, conversely, the full amount suction port 610 and the low temperature discharge port 614 begin to close, and the full amount suction port 610 and the high temperature discharge port 615 are opened to establish communication. In this state, the cooling water sucked from the entire amount suction port 610 flows to the low temperature discharge port 614 and also flows to the high temperature discharge port 615. Further, at 65 ° C. or higher, all the full amount inlet 610 and the low temperature outlet 614 are closed, and the full amount inlet 610 and the high temperature outlet 615 are fully opened. In this state, the entire amount of cooling water sucked from the entire amount suction port 610 flows to the high temperature discharge port 615.

  The low temperature valve 61 opens and closes the low temperature outlet 614 and the high temperature outlet 615 at 60 ° C. to 65 ° C. The high temperature valve 62 opens and closes the low temperature outlet 624 and the high temperature outlet 625 at 70 to 75 ° C.

  The radiator 63 is for radiating the heat of the cooling water to the atmosphere, and is usually used in a water-cooled engine. The waste heat recovery unit 64 is a liquid-liquid heat exchanger that performs heat exchange between the cooling water and the refrigerant. The water pump 65 is a pump driven by the engine and circulates and drives the cooling water. The pressure cap 67 regulates the vapor pressure of the cooling water, and the reserve 68 is a device that replenishes the cooling water.

  In the recovery passage 12, a water pump 65, an exhaust gas heat exchanger 23, and a manifold cooling device 22 are provided, and cooling water is supplied and engine waste heat is recovered by the cooling water.

  The cooling water circuit 1 of the present embodiment has the same basic structure as the cooling water circuit shown in FIG.

  The flow of the cooling water in the cooling water circuit 1 of this embodiment will be described in relation to the temperature of the cooling water.

  When the water-cooled engine 2 is started, the water pump 65 is driven by the engine 2 to supply cooling water from the supply passage 11, and finally returns to the recovery passage 12 and flows through the cooling water circuit 1.

  When the cooling water is lower than 60 ° C., the low-temperature valve 61 communicates with the entire intake port 610 and the low-temperature discharge port 614 opened. For this reason, the cooling water in the supply passage 11 immediately returns to the recovery passage 12 through the low temperature valve 61. A part of the cooling water returns from the supply passage 11 to the recovery passage 12 through the bypass passage 15. For this reason, the cooling water flowing through the bypass passage 15 is supplied to the waste heat recovery unit 64. The recovery passage 12 is heated by exhaust gas through the exhaust gas heat exchanger 23 and the manifold cooling device 22, and further through the cylinder block (not shown) of the gas engine 2.

  Since the cooling water is lower than 60 ° C., the high temperature outlet 615 of the low temperature valve 61 is not open. For this reason, the cooling water is not supplied from the supply passage 11 to the second supply passage 110. Moreover, since the threshold temperature of the high temperature valve 62 is 70 ° C. to 75 ° C., the high temperature outlet 625 is closed. For this reason, the cooling water supplied from the bypass passage 15 is also not supplied to the radiator 63. Therefore, when the cooling water temperature is 60 ° C. or lower, the cooling water is not sent to the radiator 63, the cooling water is sent to the waste heat recovery device 64 via the bypass passage 15, and most of the cooling water is supplied to the supply passage 11. And then circulates in the recovery passageway 12. The cooling water flowing through the recovery passage 12 is heated by the exhaust gas heat exchanger 23, the manifold manifold cooling device 22, and the cylinder block.

  When the cooling water temperature reaches 60 ° C. or higher, the low temperature discharge port 614 of the low temperature valve 61 starts to close and the high temperature discharge port 615 starts to open. When the cooling water temperature is 65 ° C. or higher, the low temperature discharge port 614 of the low temperature valve 61 is fully closed and the high temperature discharge port 615 is fully opened. When the low temperature discharge port 614 is closed, there is no cooling water that returns directly from the supply passage 11 to the recovery passage 12. Then, the cooling water flows from the supply passage 11 to the second supply passage 110 through the high temperature discharge port 615 of the low temperature valve 61. In the high temperature valve 62, the low temperature discharge port 624 is opened, and the high temperature discharge port 625 is closed. For this reason, the cooling water in the second supply passage 110 passes through the low temperature outlet 624 of the high temperature valve 62 and flows into the waste heat recovery passage 13 passing through the waste heat recovery device 64. Finally, it returns to the collection passage 12. Also in this case, a part of the cooling water flows from the bypass passage 15 to the waste heat recovery unit 64. That is, all the cooling water passes through the waste heat recovery device 64.

  When the cooling water temperature reaches 70 ° C. or higher, the low temperature discharge port 624 of the high temperature valve 62 starts to close and the high temperature discharge port 625 starts to open. For this reason, the cooling water in the supply passage 11 flows into the second supply passage 110 through the high temperature outlet 615 of the low temperature valve 61, then enters the radiator passage 14 through the high temperature outlet 625 of the high temperature valve 62, and enters the radiator 63. Cooling water flows inside. Due to heat radiation by the radiator 64, the cooling water is cooled and its temperature is lowered. The cooling water whose temperature has decreased returns to the recovery passageway 12. When the cooling water temperature is 75 ° C. or higher, the low temperature discharge port 624 of the high temperature valve 62 is fully closed and the high temperature discharge port 625 is fully opened. Therefore, all the cooling water supplied to the second supply passage 110 enters the radiator passage 14 and does not flow to the waste heat recovery passage 13.

  The refrigerant circuit 4 includes two compressors 3 driven by the engine 2, an oil separator 71, a four-way switching valve 72, an indoor unit heat exchanger 73, an indoor unit expansion valve 74, an outdoor unit expansion valve 75, and an outdoor unit heat exchanger 76. And an accumulator 77, a sub liquid valve 78 and a waste heat recovery unit 64. The two compressors 3 are arranged in parallel and are driven by a driving belt 31 mounted on the output pulley 21 of the engine 2 to adiabatically compress the refrigerant gas into a high-temperature and high-pressure refrigerant gas.

  The refrigerant circuit 4 includes a supply passage 41 that connects the discharge port 31 of each compressor 3 and the inlet 720 of the four-way valve 72, and a recovery passage 42 that connects the outlet 723 of the four-way valve 72 and the suction port 32 of the compressor 3. The heat exchanger passage connecting the indoor unit heat exchanger 73, the indoor unit expansion valve 74, the outdoor unit expansion valve 75, and the outdoor unit heat exchanger 76 in series with the first opening 721 and the second opening 722 of the four-way valve 72 as both ends. 43 and a waste heat recovery passage 44 connecting the heat exchange passage 43 and the recovery passage 42 through the waste heat recovery device 64.

  An oil separator 71 is provided in the supply passage 41, and the separated oil is returned to the recovery passage 42 via the oil recovery passage 45. An accumulator 77 is provided in the collection passage 42. The accumulator 77 stores liquid refrigerant and returns gaseous refrigerant to the compressor 3.

  The heat exchange passage 43 includes a first heat exchange passage portion 431 connecting the first opening 721 of the four-way valve 72 and the indoor unit exchanger 73 via the spindle valve 78, an indoor unit expansion valve 74, a spindle valve 78, and an outdoor unit expansion valve. 75, a second heat exchange passage 432 that connects the indoor unit heat exchanger 73 and the outdoor unit heat exchanger 76, and a third heat that connects the outdoor unit heat exchanger 76 and the second opening 722 of the four-way valve 72. And an exchange passage portion 433. The indoor unit expansion valve 74 functions as an expansion valve when the refrigerant flows from the indoor unit heat exchanger 73 to the outdoor unit heat exchanger 76 through the second heat exchange passage portion 432. Conversely, the outdoor unit expansion valve 75 functions as an expansion valve when the refrigerant flows from the outdoor unit heat exchanger 76 to the indoor unit heat exchanger 73 through the second heat exchange passage 432.

  The waste heat recovery passage 44 includes a first waste heat recovery passage portion 441 that connects the second heat exchange passage portion 432 and the waste heat recovery device 64 via the sub liquid valve 79, the waste heat recovery device 64, and the recovery passage 42. And a second waste heat recovery passage portion 442 connecting the two. The sub liquid valve 79 is a valve that controls the flow rate of the liquid refrigerant flowing in the waste heat recovery passage 44. Here, when the outside air temperature is lower than the refrigerant temperature, the flow rate of the sub liquid valve 79 is increased, and when it is higher, the flow rate of the sub liquid valve 79 is decreased.

  The indoor unit heat exchanger 73 and the indoor unit expansion valve 74 of the water-cooled engine heat pump are normally disposed in a room to be air-conditioned, and other parts such as the engine 2 and the compressor 3 are disposed outside the room. The water-cooled engine heat pump of the present embodiment has the configuration described above.

  Next, the function of this water-cooled engine heat pump will be described.

  When this water-cooled heat pump is used for heating, the inlet of the four-way valve 72 communicates with the inlet 720 of the four-way valve 72 and the first opening 721, and the second opening 722 of the four-way valve 72 communicates with the outlet 723. Switch to let As a result, the high-pressure refrigerant adiabatically compressed by the compressor 3 passes through the oil separator 71 of the supply passage 41, flows to the first heat exchange passage portion 431 through the four-way valve 72, and enters the indoor unit heat exchanger 73. In the indoor unit heat exchanger 73, the heat of the refrigerant is transmitted to the indoor air, and the temperature of the refrigerant decreases. Conversely, the indoor air is heated and heated. The refrigerant exiting the indoor unit heat exchanger 73 passes through the indoor unit expansion valve 74 and is adiabatically expanded, whereby the temperature of the refrigerant is cooled and partially liquefied, and the temperature of the refrigerant decreases. The partially liquefied refrigerant enters the outdoor unit heat exchanger 76 through the second heat exchange passage 432. The outdoor unit heat exchanger 76 transfers the heat of the outside air to the refrigerant. As a result, the refrigerant is heated and the liquid refrigerant is vaporized into a gas. The refrigerant that has become gas enters the recovery passageway 42 via the four-way valve 72, is separated into gas and liquid by the accumulator 77, and only the gaseous refrigerant returns to the compressor 3. Further, the liquid refrigerant flowing in the second heat exchange passage portion 432 flows in the waste heat recovery passage 44. That is, a part of the liquid refrigerant in the second heat exchange passage portion 432 enters the waste heat recovery device 64 through the sub liquid valve 79 and flows into the recovery passage 42. In the waste heat recovery device 64, the liquid refrigerant is heated and vaporized to become a gaseous refrigerant.

  The amount of heat recovered by the waste heat recovery device 64 varies greatly with the cooling water temperature. In this embodiment, when the cooling water temperature is lower than 60 ° C., the cooling water is not supplied from the supply passage 11 to the second supply passage 110 by the low temperature valve 61. Therefore, only the cooling water passing through the bypass passage 15 is supplied to the waste heat recovery unit 64. When the cooling water temperature becomes 60 ° C. or higher, the high temperature outlet 615 of the low temperature valve 61 starts to open, and the cooling water starts to be supplied from the supply passage 11 to the second supply passage 110. When the cooling water temperature is 65 ° C. or higher and lower than 70 ° C., all the cooling water passes through the waste heat recovery device 64. When the cooling water temperature is 70 ° C. or higher, the cooling water in the second supply passage 110 starts to flow to the radiator 63 through the high temperature discharge port 625 of the high temperature valve 62, and the cooling water flowing to the waste heat recovery unit 64 starts to decrease. When the cooling water temperature is 75 ° C. or higher, the cooling water flowing through the waste heat recovery device 64 is only the cooling water flowing through the bypass passage 15.

  In the heating operation, the heat taken into the refrigerant from the outside air and the cooling water by the outdoor unit heat exchanger 76 and the waste heat recovery unit 64 is used to heat the indoor air by the indoor unit heat exchanger 73.

  Next, the case where it uses for cooling is demonstrated. First, the valve of the four-way valve 72 is switched so that the inlet 720 and the second opening 722 of the four-way valve 72 communicate with each other and the first opening 721 and the outlet 723 of the four-way valve 72 communicate with each other. Accordingly, the high-temperature and high-pressure refrigerant adiabatically compressed by the compressor 3 flows from the supply passage 41 through the four-way valve 72 to the third heat exchange passage portion 433 and enters the outdoor unit heat exchanger 76. In the outdoor unit heat exchanger 76, the heat of the refrigerant is transmitted to the outdoor air, and the temperature of the refrigerant decreases. The refrigerant leaving the outdoor unit heat exchanger 76 passes through the outdoor unit expansion valve 75 and is adiabatically expanded, whereby the temperature of the refrigerant is cooled and partially liquefied, and the temperature of the refrigerant is lowered. The partially liquefied refrigerant passes through the second heat exchange passage 432 and enters the indoor unit heat exchanger 73. The indoor unit heat exchanger 73 cools the indoor air, the refrigerant is heated in reverse, and the liquid refrigerant is vaporized into a gas. The refrigerant that has become gas enters the recovery passageway 42 via the four-way valve 72, is separated into gas and liquid by the accumulator 77, and only the gaseous refrigerant returns to the compressor 3. Further, the gaseous refrigerant flowing in the second heat exchange passage portion 432 is blocked by the sub liquid valve 79 and does not flow into the waste heat recovery passage 44.

  In this cooling circuit, cooling water always flows through the waste heat recovery unit 64. In the cooling operation in a state where the outside air temperature is low, if the temperature of the indoor unit heat exchanger 73 is too low, the indoor unit heat exchanger 73 must be intermittently operated by performing ON-OFF control to prevent the indoor unit heat exchanger 73 from freezing. . However, by opening the sub liquid valve 79, heat can be applied to the low pressure side of the refrigerant circuit 4, and the indoor unit heat exchanger 73 can be prevented from freezing, so that continuous operation is possible.

  In the cooling operation, the heat of the refrigerant is transmitted to the outside air by the outdoor unit heat exchanger 76, the indoor heat is transmitted to the refrigerant by the indoor unit heat exchanger 73, and the indoor temperature is lowered.

  Next, the water-cooled engine heat pump of this embodiment is started when the engine is started for heating in a state where the outside air temperature is −5 ° C. and the outdoor unit heat exchanger 76 cannot sufficiently pump the heat. The test results of the engine speed, the coolant temperature, and the refrigerant low pressure during the subsequent elapsed time of 0 to 10 minutes will be described.

  For comparison, a water-cooled engine heat pump of a comparative example in which only the bypass passage 15 is closed with the water-cooled engine heat pump of the embodiment is made, and the same outside air temperature is −5 ° C., and heat is pumped up by the outdoor unit heat exchanger 76. The test results of the engine speed, the coolant temperature, and the refrigerant low pressure during the elapsed time 0 to 10 minutes when the engine was started for heating in a state where it was not sufficiently obtained were obtained.

  The obtained results are shown in Table 1, FIG. 10, FIG. 11 and FIG. In addition, the value without a bypass is the value of the water-cooled engine heat pump of a comparative example, and the value with a bypass shows the value of the water-cooled engine heat pump of a present Example. 10 is a diagram showing the relationship between the elapsed time after startup and the engine speed, FIG. 11 is a diagram showing the relationship between the elapsed time after startup and the coolant temperature, and FIG. It is a diagram which shows the relationship between elapsed time and a refrigerant | coolant low pressure.

  In both the water-cooled engine heat pumps of the example and the comparative example, when the engine was started, the engine speed was 1000 rpm after 1 minute, and both refrigerant low pressures were reduced from 0.65 Mpa to 0.3 Mpa. The cooling water temperature is changed from −5 ° C. to 0 ° C. in the example and from −5 ° C. to 5 ° C. in the comparative example, and the cooling water temperature of the water-cooled engine heat pump of the comparative example is higher.

  When the elapsed time reaches 2 minutes, the engine speed starts to increase to 1100 rpm in the embodiment, and the engine speed continues to increase from 2 to 9 minutes in the embodiment, and becomes constant at 2300 rpm after 9 minutes. It was. On the other hand, in the comparative example, the low speed rotation was maintained at 1000 rpm from 2 minutes to 6 minutes, and the increase in the engine speed was observed after 6 minutes, and the engine speed after 10 minutes was 1800 rpm. It was.

  In the examples, the cooling water temperature was from 0 minutes to 5 minutes, the temperature rising speed of the cooling water was slow at the initial stage, and a rapid temperature increase was shown in the second half. The temperature became 60 ° C. after 5 minutes, and then maintained at 60 ° C.

  On the other hand, the comparative example showed a substantially constant temperature increase from 0 minutes to 7 minutes, became 60 ° C. after 7 minutes, and then maintained 60 ° C.

  Comparing the example and the comparative example, from 0 to 3 minutes, the temperature of the cooling water of the example is lower than the temperature of the cooling water of the comparative example, and after 3 minutes, both are equal to 25 ° C., and then from 3 minutes Up to 7 minutes, the temperature of the cooling water of the example was higher than the temperature of the cooling water of the comparative example.

  In the refrigerant low pressure, in both the example and the comparative example, the refrigerant low pressure is further lowered after 1 minute and is higher than the minimum, and when 10 minutes have elapsed, the refrigerant low pressure in the example is 0.66 Mpa, compared with that in the comparative example. The refrigerant low pressure is only 0.5 Mpa.

  When the refrigerant low pressure increases, the engine speed can be increased. The increase in engine speed in the embodiment of FIG. 10 corresponds to the increase in refrigerant low pressure in the embodiment of FIG.

  At the refrigerant low pressure, after 2 minutes, the refrigerant low pressure in the example is lower than the refrigerant low pressure in the comparative example. This means that the gas pressure of the refrigerant sent to the compressor 3 driven by the engine is high in the embodiment and low in the comparative example. That is, in the embodiment, a higher-pressure refrigerant gas is sent to the compressor and the engine speed is high, so that a larger amount of the refrigerant gas is adiabatically compressed by the compressor. Therefore, a larger amount of high-temperature and high-pressure refrigerant is sent to the indoor unit heat exchanger 73, and warm air is obtained from the indoor unit heat exchanger 73 in a short time after the engine is started.

  The reason for the low coolant temperature within 3 minutes after the engine is started is that the coolant flowing through the bypass passage 15 passes heat to the refrigerant at approximately −20 ° C. in the waste heat recovery unit 64. In the embodiment, the rise in the coolant temperature accompanying the start-up of the engine is temporarily lower than in the comparative example because of cooling by the refrigerant in the bypass passage. However, as is clear from FIG. 10, the engine speed of the example is higher than that of the comparative example. That is, the fuel of the embodiment consumes more fuel per unit time, and the cooling water of the embodiment per unit time is supplied with a larger amount of heat from the engine.

  In the embodiment, since a large amount of heat is supplied from the engine to the cooling water, the refrigerant low pressure is high, and a larger amount of refrigerant gas is adiabatically compressed by the compressor. Therefore, a larger amount of high-temperature and high-pressure refrigerant is sent to the indoor unit heat exchanger 73, and warm air is obtained from the indoor unit heat exchanger 73 in a short time after the engine is started.

  Therefore, as shown in the water-cooled engine heat pump of the present embodiment, when the outside air temperature is low and heat absorption by the outdoor unit heat exchanger 76 cannot be expected, the engine waste heat recovery by the engine drive becomes high, and the indoor unit is shortened in a shorter time. Heating by the heat exchanger 73 becomes possible.

  In the present embodiment, the specific cooling water circuit and the refrigerant circuit have been described. However, the present invention is not limited to this embodiment, and a conventionally known cooling water circuit is provided with a bypass passage or is conventionally known. The refrigerant circuit currently used can also be employ | adopted.

1 shows a cooling water circuit according to the present invention. 3 shows another cooling water circuit according to the present invention. 3 shows another cooling water circuit according to the present invention. 3 shows another cooling water circuit according to the present invention. 3 shows another cooling water circuit according to the present invention. 3 shows another cooling water circuit according to the present invention. 3 shows another cooling water circuit according to the present invention. 3 shows another cooling water circuit according to the present invention. It is a basic lineblock diagram of the water cooling engine heat pump of the example of the present invention. It is a diagram which shows the relationship between the elapsed time after engine starting of the water cooling engine heat pump of the Example of this invention, and the water cooling engine heat pump of a comparative example, and an engine speed. It is a diagram which shows the relationship between the elapsed time after engine starting of the water cooling engine heat pump of the Example of this invention, and the water cooling engine heat pump of a comparative example, and cooling water temperature. It is a diagram which shows the relationship between the elapsed time after engine starting of the water cooling engine heat pump of the Example of this invention, and the water cooling engine heat pump of a comparative example, and a refrigerant | coolant low pressure.

Explanation of symbols

1: Cooling water circuit 2: Gas engine 3: Compressor 4: Refrigerant circuit 11: Supply passage 12: Recovery passage 13: Waste heat recovery passage 14: Radiator passage 15: Bypass passage (bypass circuit)
16: Water channel resistance 25: Cooling water discharge port 26: Cooling water suction port 110: Second supply passage 120: Second recovery passage 150: Second bypass passage (bypass circuit) 61: Low temperature valve 610: Full amount suction port 611: Low temperature Suction port 612: High temperature suction port 613: Total discharge port 614: Low temperature discharge port 615: High temperature discharge port 62: High temperature valve 620: Full volume suction port 621: Low temperature suction port 622: High temperature suction port 623: Full volume discharge port 624: Low temperature discharge port Outlet 625: High temperature outlet 63: Radiator 64: Waste heat recovery device 65: Water pump 73: Indoor unit heat exchanger 74: Indoor unit expansion valve 75: Outdoor unit expansion valve 76: Outdoor unit heat exchanger 77: Accumulator 79: Sub liquid valve

Claims (9)

A water-cooled engine, a refrigerant compression compressor driven by the engine, a refrigerant heat exchanger, and a waste heat recovery device for transferring heat of the engine to the refrigerant,
The waste heat recovery device is connected to a cooling water circuit for cooling the engine, a refrigerant circuit for circulating a refrigerant compressed by the compressor, the cooling water circuit, and the refrigerant circuit, and the heat of the cooling water is used as the refrigerant. A water-cooled engine heat pump having a waste heat recovery device for transmitting and a stop means for stopping the supply of the cooling water to the waste heat recovery device in a low temperature operation state where the temperature of the cooling water circulating through the cooling water circuit is lower than a predetermined value There,
The cooling water circuit has a bypass circuit that bypasses the stopping means and sends the cooling water that has passed through the engine to the waste heat recovery unit,
The stopping means is a low-temperature valve that opens and closes the valve at a predetermined low temperature, and the cooling water circuit further opens and closes the radiator and the supply of the cooling water to the radiator at a predetermined high temperature higher than the predetermined low temperature. With a high temperature valve that
The low temperature valve includes a suction port for sucking cooling water, a low temperature port for discharging the entire amount of cooling water sucked from the suction port at a temperature lower than the first temperature, and a second temperature that is equal to or higher than the first temperature. A high temperature outlet that discharges the entire amount of cooling water sucked from the inlet at a temperature equal to or higher than the temperature of
The high temperature valve has a suction port for sucking cooling water, a low temperature port for discharging the entire amount of cooling water sucked from the suction port at a temperature lower than a third temperature, and a fourth temperature not lower than the third temperature. A high temperature outlet that discharges the entire amount of cooling water sucked from the inlet at a temperature equal to or higher than the temperature of
The cooling water circuit includes a supply passage that connects a cooling water discharge port of the engine and a suction port of the low temperature valve, a recovery passage that connects a low temperature port of the low temperature valve and a cooling water suction port of the engine, and the low temperature valve A second supply passage connecting the high temperature port and the suction port of the high temperature valve, a waste heat recovery passage connecting the low temperature port of the high temperature valve and the recovery passage through the waste heat recovery device, and passing through the radiator. having a radiator passage connecting the high-temperature outlet and said recovery passage of the high temperature valve, the bypass circuit is a bypass passage der Ru water cooling engine heat pump connecting the said supply passage and said waste heat recovery unit of the supply port. A water-cooled engine, a refrigerant compression compressor driven by the engine, a refrigerant heat exchanger, and a waste heat recovery device for transferring heat of the engine to the refrigerant,
The waste heat recovery device is connected to a cooling water circuit for cooling the engine, a refrigerant circuit for circulating a refrigerant compressed by the compressor, the cooling water circuit, and the refrigerant circuit, and the heat of the cooling water is used as the refrigerant. A water-cooled engine heat pump having a waste heat recovery device for transmitting and a stop means for stopping the supply of the cooling water to the waste heat recovery device in a low temperature operation state where the temperature of the cooling water circulating through the cooling water circuit is lower than a predetermined value There,
The cooling water circuit has a bypass circuit that bypasses the stopping means and sends the cooling water that has passed through the engine to the waste heat recovery unit,
The stopping means is a low-temperature valve that opens and closes the valve at a predetermined low temperature, and the cooling water circuit further opens and closes the radiator and the supply of the cooling water to the radiator at a predetermined high temperature higher than the predetermined low temperature. With a high temperature valve that
The low temperature valve includes a suction port for sucking cooling water, a low temperature port for discharging the entire amount of cooling water sucked from the suction port at a temperature lower than the first temperature, and a second temperature that is equal to or higher than the first temperature. A high temperature outlet that discharges the entire amount of cooling water sucked from the inlet at a temperature equal to or higher than the temperature of
The high temperature valve includes a discharge port for discharging cooling water, a low temperature port for sucking the entire amount of cooling water discharged from the discharge port at a temperature lower than a third temperature, and a fourth temperature that is equal to or higher than the third temperature. A high-temperature port for sucking the entire amount of cooling water discharged from the discharge port at a temperature equal to or higher than the temperature,
The cooling water circuit includes a supply passage connecting the cooling water discharge port of the engine and the suction port of the low temperature valve, a recovery passage connecting the low temperature port of the low temperature valve and the cooling water suction port of the engine, and the waste heat. A waste heat recovery passage connecting the high temperature port of the low temperature valve and the low temperature port of the high temperature valve through a recovery device, a radiator passage connecting the high temperature port of the low temperature valve and the high temperature port of the high temperature valve through the radiator, A second recovery passage connecting the discharge port of the high temperature valve and the recovery passage, and the bypass circuit includes a first bypass passage connecting the supply passage and a supply port of the waste heat recovery device, and the waste heat recovery device outlet and the collection passage and said second recovery either and Ru water cooling engine heat pump name and a second bypass passage which connects the passageway. A water-cooled engine, a refrigerant compression compressor driven by the engine, a refrigerant heat exchanger, and a waste heat recovery device for transferring heat of the engine to the refrigerant,
The waste heat recovery device is connected to a cooling water circuit for cooling the engine, a refrigerant circuit for circulating a refrigerant compressed by the compressor, the cooling water circuit, and the refrigerant circuit, and the heat of the cooling water is used as the refrigerant. A water-cooled engine heat pump having a waste heat recovery device for transmitting and a stop means for stopping the supply of the cooling water to the waste heat recovery device in a low temperature operation state where the temperature of the cooling water circulating through the cooling water circuit is lower than a predetermined value There,
The cooling water circuit has a bypass circuit that bypasses the stopping means and sends the cooling water that has passed through the engine to the waste heat recovery unit,
The stopping means is a low-temperature valve that opens and closes the valve at a predetermined low temperature, and the cooling water circuit further opens and closes the radiator and the supply of the cooling water to the radiator at a predetermined high temperature higher than the predetermined low temperature. With a high temperature valve that
The low temperature valve includes a suction port for sucking cooling water, a low temperature port for discharging the entire amount of cooling water sucked from the suction port at a temperature lower than the first temperature, and a second temperature that is equal to or higher than the first temperature. A high temperature outlet that discharges the entire amount of cooling water sucked from the inlet at a temperature equal to or higher than the temperature of
The high temperature valve has a suction port for sucking cooling water, a low temperature port for discharging the entire amount of cooling water sucked from the suction port at a temperature lower than a third temperature, and a fourth temperature not lower than the third temperature. A high temperature outlet that discharges the entire amount of cooling water sucked from the inlet at a temperature equal to or higher than the temperature of
The cooling water circuit includes a supply passage connecting the cooling water discharge port of the engine and the suction port of the high temperature valve, a second supply passage connecting the low temperature port of the high temperature valve and the suction port of the low temperature valve, and the low temperature A recovery passage connecting the low temperature port of the valve and the cooling water intake port of the engine, a waste heat recovery passage connecting the high temperature port of the low temperature valve and the recovery passage through the waste heat recovery unit, and passing through the radiator having a radiator passage connecting the high-temperature outlet and said recovery passage of the high temperature valve, the bypass circuit is a bypass passage der Ru water cooling engine heat pump connecting the said supply passage and said waste heat recovery unit of the supply port. A water-cooled engine, a refrigerant compression compressor driven by the engine, a refrigerant heat exchanger, and a waste heat recovery device for transferring heat of the engine to the refrigerant,
The waste heat recovery device is connected to a cooling water circuit for cooling the engine, a refrigerant circuit for circulating a refrigerant compressed by the compressor, the cooling water circuit, and the refrigerant circuit, and the heat of the cooling water is used as the refrigerant. A water-cooled engine heat pump having a waste heat recovery device for transmitting and a stop means for stopping the supply of the cooling water to the waste heat recovery device in a low temperature operation state where the temperature of the cooling water circulating through the cooling water circuit is lower than a predetermined value There,
The cooling water circuit has a bypass circuit that bypasses the stopping means and sends the cooling water that has passed through the engine to the waste heat recovery unit,
The stopping means is a low-temperature valve that opens and closes the valve at a predetermined low temperature, and the cooling water circuit further opens and closes the radiator and the supply of the cooling water to the radiator at a predetermined high temperature higher than the predetermined low temperature. With a high temperature valve that
The low temperature valve includes a discharge port for discharging cooling water, a low temperature port for sucking the entire amount of cooling water discharged from the discharge port at a temperature lower than the first temperature, and a second temperature that is equal to or higher than the first temperature. A high-temperature port for sucking the entire amount of cooling water discharged from the discharge port at a temperature equal to or higher than the temperature,
The high temperature valve has a suction port for sucking cooling water, a low temperature port for discharging the entire amount of cooling water sucked from the suction port at a temperature lower than a third temperature, and a fourth temperature not lower than the third temperature. A high temperature outlet that discharges the entire amount of cooling water sucked from the inlet at a temperature equal to or higher than the temperature of
The cooling water circuit includes a supply passage that connects a cooling water discharge port of the engine and a suction port of the high temperature valve, a second supply passage that connects a low temperature port of the high temperature valve and a low temperature port of the low temperature valve, and the low temperature A recovery passage connecting the exhaust port of the valve and the cooling water intake port of the engine, a waste heat recovery passage connecting the second supply passage and the high temperature port of the low temperature valve through the waste heat recovery device, and the radiator And a radiator passage connecting the high temperature port of the high temperature valve and the high temperature port of the low temperature valve, and the bypass circuit includes a first bypass passage connecting the supply passage and the second supply passage, and a waste heat recovery unit. downstream of the waste heat recovery passage and said return passage and Ru water cooling engine heat pump name and a second bypass passage which connects the. A water-cooled engine, a refrigerant compression compressor driven by the engine, a refrigerant heat exchanger, and a waste heat recovery device for transferring heat of the engine to the refrigerant,
The waste heat recovery device is connected to a cooling water circuit for cooling the engine, a refrigerant circuit for circulating a refrigerant compressed by the compressor, the cooling water circuit, and the refrigerant circuit, and the heat of the cooling water is used as the refrigerant. A water-cooled engine heat pump having a waste heat recovery device for transmitting and a stop means for stopping the supply of the cooling water to the waste heat recovery device in a low temperature operation state where the temperature of the cooling water circulating through the cooling water circuit is lower than a predetermined value There,
The cooling water circuit has a bypass circuit that bypasses the stopping means and sends the cooling water that has passed through the engine to the waste heat recovery unit,
The stopping means is a low-temperature valve that opens and closes the valve at a predetermined low temperature, and the cooling water circuit further opens and closes the radiator and the supply of the cooling water to the radiator at a predetermined high temperature higher than the predetermined low temperature. With a high temperature valve that
The low temperature valve includes a discharge port for discharging cooling water, a low temperature port for sucking the entire amount of cooling water discharged from the discharge port at a temperature lower than the first temperature, and a second temperature that is equal to or higher than the first temperature. A high-temperature port for sucking the entire amount of cooling water discharged from the discharge port at a temperature equal to or higher than the temperature,
The high temperature valve includes a discharge port for discharging cooling water, a low temperature port for sucking the entire amount of cooling water discharged from the discharge port at a temperature lower than a third temperature, and a fourth temperature that is equal to or higher than the third temperature. A high-temperature port for sucking the entire amount of cooling water discharged from the discharge port at a temperature equal to or higher than the temperature,
The cooling water circuit includes a supply passage connecting the cooling water discharge port of the engine and the low temperature port of the low temperature valve, a recovery passage connecting the discharge port of the low temperature valve and the cooling water suction port of the engine, and the waste heat. A waste heat recovery passage connecting the supply passage and the low temperature port of the high temperature valve through the recovery unit, a radiator passage connecting the supply passage and the high temperature port of the high temperature valve through the radiator, and an exhaust port of the high temperature valve having a second recovery passage connecting the high-temperature outlet of the low temperature valve, the bypass circuit is Ru bypass der connecting the downstream waste heat recovery passage and said collecting passage of the waste heat recovery device water-cooling Engine heat pump. A water-cooled engine, a refrigerant compression compressor driven by the engine, a refrigerant heat exchanger, and a waste heat recovery device for transferring heat of the engine to the refrigerant,
The waste heat recovery device is connected to a cooling water circuit for cooling the engine, a refrigerant circuit for circulating a refrigerant compressed by the compressor, the cooling water circuit, and the refrigerant circuit, and the heat of the cooling water is used as the refrigerant. A water-cooled engine heat pump having a waste heat recovery device for transmitting and a stop means for stopping the supply of the cooling water to the waste heat recovery device in a low temperature operation state where the temperature of the cooling water circulating through the cooling water circuit is lower than a predetermined value There,
The cooling water circuit has a bypass circuit that bypasses the stopping means and sends the cooling water that has passed through the engine to the waste heat recovery unit,
The stopping means is a low-temperature valve that opens and closes the valve at a predetermined low temperature, and the cooling water circuit further opens and closes the radiator and the supply of the cooling water to the radiator at a predetermined high temperature higher than the predetermined low temperature. With a high temperature valve that
The low temperature valve includes a discharge port for discharging cooling water, a low temperature port for sucking the entire amount of cooling water discharged from the discharge port at a temperature lower than the first temperature, and a second temperature that is equal to or higher than the first temperature. A high-temperature port for sucking the entire amount of cooling water discharged from the discharge port at a temperature equal to or higher than the temperature,
The high temperature valve has a suction port for sucking cooling water, a low temperature port for discharging the entire amount of cooling water sucked from the suction port at a temperature lower than a third temperature, and a fourth temperature not lower than the third temperature. A high temperature outlet that discharges the entire amount of cooling water sucked from the inlet at a temperature equal to or higher than the temperature of
The cooling water circuit includes a supply passage that connects a cooling water discharge port of the engine and a low temperature port of the low temperature valve, a second supply passage that connects the supply passage and a suction port of the high temperature valve, and a discharge of the low temperature valve. A recovery passage connecting the outlet and the cooling water intake port of the engine, a waste heat recovery passage connecting the low temperature port of the high temperature valve and the high temperature port of the low temperature valve through the waste heat recovery unit, and passing through the radiator A first bypass passage connecting a high temperature port of the high temperature valve and a radiator passage connecting the high temperature port of the low temperature valve, the bypass circuit connecting the supply passage and the waste heat recovery passage upstream of the waste heat recovery unit; a waste heat recovery device downstream of the waste heat recovery passage and said return passage and Ru water cooling engine heat pump name and a second bypass passage which connects the. A water-cooled engine, a refrigerant compression compressor driven by the engine, a refrigerant heat exchanger, and a waste heat recovery device for transferring heat of the engine to the refrigerant,
The waste heat recovery device is connected to a cooling water circuit for cooling the engine, a refrigerant circuit for circulating a refrigerant compressed by the compressor, the cooling water circuit, and the refrigerant circuit, and the heat of the cooling water is used as the refrigerant. A water-cooled engine heat pump having a waste heat recovery device for transmitting and a stop means for stopping the supply of the cooling water to the waste heat recovery device in a low temperature operation state where the temperature of the cooling water circulating through the cooling water circuit is lower than a predetermined value There,
The cooling water circuit has a bypass circuit that bypasses the stopping means and sends the cooling water that has passed through the engine to the waste heat recovery unit,
The stopping means is a low-temperature valve that opens and closes the valve at a predetermined low temperature, and the cooling water circuit further opens and closes the radiator and the supply of the cooling water to the radiator at a predetermined high temperature higher than the predetermined low temperature. With a high temperature valve that
The low temperature valve includes a discharge port for discharging cooling water, a low temperature port for sucking the entire amount of cooling water discharged from the discharge port at a temperature lower than the first temperature, and a second temperature that is equal to or higher than the first temperature. A high-temperature port for sucking the entire amount of cooling water discharged from the discharge port at a temperature equal to or higher than the temperature,
The high temperature valve includes a discharge port for discharging cooling water, a low temperature port for sucking the entire amount of cooling water discharged from the discharge port at a temperature lower than a third temperature, and a fourth temperature that is equal to or higher than the third temperature. A high-temperature port for sucking the entire amount of cooling water discharged from the discharge port at a temperature equal to or higher than the temperature,
The cooling water circuit includes a supply passage connecting the cooling water discharge port of the engine and the low temperature port of the low temperature valve, a second recovery passage connecting the discharge port of the low temperature valve and the low temperature port of the high temperature valve, and the high temperature A recovery passage connecting the exhaust port of the valve and the cooling water intake port of the engine, a waste heat recovery passage connecting the supply passage and the high temperature port of the low temperature valve through the waste heat recovery unit, and passing through the radiator. having a radiator passage connecting the hot port of the supply passage and the high temperature valve, the bypass circuit is Ru bypass der connecting the waste heat recovery passage and said collecting passage downstream of the waste heat recovery device water-cooling Engine heat pump. A water-cooled engine, a refrigerant compression compressor driven by the engine, a refrigerant heat exchanger, and a waste heat recovery device for transferring heat of the engine to the refrigerant,
The waste heat recovery device is connected to a cooling water circuit for cooling the engine, a refrigerant circuit for circulating a refrigerant compressed by the compressor, the cooling water circuit, and the refrigerant circuit, and the heat of the cooling water is used as the refrigerant. A water-cooled engine heat pump having a waste heat recovery device for transmitting and a stop means for stopping the supply of the cooling water to the waste heat recovery device in a low temperature operation state where the temperature of the cooling water circulating through the cooling water circuit is lower than a predetermined value There,
The cooling water circuit has a bypass circuit that bypasses the stopping means and sends the cooling water that has passed through the engine to the waste heat recovery unit,
The stopping means is a low-temperature valve that opens and closes the valve at a predetermined low temperature, and the cooling water circuit further opens and closes the radiator and the supply of the cooling water to the radiator at a predetermined high temperature higher than the predetermined low temperature. With a high temperature valve that
The low temperature valve includes a suction port for sucking cooling water, a low temperature port for discharging the entire amount of cooling water sucked from the suction port at a temperature lower than the first temperature, and a second temperature that is equal to or higher than the first temperature. A high temperature outlet that discharges the entire amount of cooling water sucked from the inlet at a temperature equal to or higher than the temperature of
The high temperature valve includes a discharge port for discharging cooling water, a low temperature port for sucking the entire amount of cooling water discharged from the discharge port at a temperature lower than a third temperature, and a fourth temperature that is equal to or higher than the third temperature. A high-temperature port for sucking the entire amount of cooling water discharged from the discharge port at a temperature equal to or higher than the temperature,
The cooling water circuit includes a supply passage that connects a cooling water discharge port of the engine and a suction port of the low temperature valve, a recovery passage that connects a low temperature port of the low temperature valve and the cooling water suction port of the engine, and the waste heat. A waste heat recovery passage connecting the supply passage and the low temperature port of the high temperature valve through the recovery unit, a radiator passage connecting the supply passage and the high temperature port of the high temperature valve through the radiator, and an exhaust port of the high temperature valve And a second recovery passage that connects the recovery passage, and the bypass circuit includes a first bypass passage that connects the supply passage and the waste heat recovery passage on the upstream side of the waste heat recovery device, and the waste heat recovery device, downstream of the waste heat recovery passage and said return passage and Ru water cooling engine heat pump name and a second bypass passage connecting the.   The water-cooled engine heat pump according to any one of claims 1 to 8, wherein the bypass circuit is provided with a channel resistance that regulates an amount of water flowing through the bypass circuit.

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