JP2508758B2 - Freezing / heating control device mounted on the vehicle - Google Patents

Description

Description: [Industrial field of application] The present invention relates to a vehicle equipped with a storage room for transporting foods and the like.
The present invention relates to a refrigeration / heating control device mounted on a vehicle for performing heating control of a driver's cab.

[Prior Art] As a vehicle for transporting foods and the like, a refrigerating vehicle including a freezer for freezing a storage room thereof is generally known. In such a refrigeration vehicle, for example, in the winter in a cold region, when the outside air temperature is a very low temperature below the freezing point, the internal cold storage temperature drops significantly. Therefore, if milk is transported in such a state, the milk will freeze. Therefore, in a vehicle that carries such foods, it is required to control not only freezing but also heating as necessary.

In consideration of such a point, it has been considered to control not only freezing but also heating in a refrigerating car as disclosed in, for example, JP-A-55-31219.

However, a vehicle equipped with such a refrigerating and heating-controlled storage naturally requires a heating device for the cab for the winter season.

Generally, in a heating device for a driver's cab used in a vehicle, a hot water heater using engine cooling water is used.

[Problems to be Solved by the Invention] The present invention has been made in view of the above points, and particularly in a refrigeration vehicle in which a refrigeration cycle is set, the heating control of the refrigerator and the heating control of the freezer are efficient. It is intended to provide a refrigeration / warming control device mounted on a vehicle that is to be executed in a specific manner.

[Means for Solving Problems] That is, in the refrigeration / warming control device mounted on the vehicle according to the present invention, the compressed refrigerant from the refrigerant compressor is transferred to the internal heat exchanger via the expansion valve. To control the freezing of the inside of the refrigerator, and to bypass the expansion valve to supply the refrigerant to the heat exchanger of the inside of the refrigerator to control the heating of the inside of the refrigerator. To do. Then, during this internal heating control, the output refrigerant from the internal heat exchanger is returned to the compressor via the expansion valve and the cooling water heat exchanger. Cooling water warmed in the engine part is supplied to this cooling water heat exchanger part as a heat exchange medium via a heater core for heating the cab, and the cooling water passing through this heat exchanger part is supplied. Is returned to the engine section, and passages for selectively bypassing cooling water are set in parallel in the heater core section.

[Operation] In the refrigeration / warming control device as described above, the output refrigerant from the compressor is supplied to the expansion valve and is supplied to the internal heat exchanger, so that it is mounted on the vehicle. The stored storage will be used as a freezer. Also,
When the compressed refrigerant bypasses the expansion valve and is supplied to the internal heat exchanger, the storage is heated and controlled, in which case the refrigerant is heat-exchanged with the engine cooling water. By being returned to the compressor, efficient heating control can be executed. In this case, the cooling water that exchanges heat with the refrigerant has also passed through the heater core portion for heating the driver's cab, so that the heating in the driver's cab is also performed at the same time. Then, for example, when it is desired to rapidly heat the storage, the heater core is bypassed and cooling water is circulated so that the heating efficiency can be improved.

[Embodiment of the Invention] An embodiment of the present invention will be described below with reference to the drawings. The accompanying drawings show the structure, and although the refrigerant compressor 11 is not shown in detail in this figure, it is driven by an engine for vehicle running or an auxiliary engine for specially set refrigeration / heating control. .

The compressed refrigerant discharged from the refrigerant compressor 11 is supplied to the condenser 12 through the refrigerant passage. In the condenser 12, heat exchange is performed with the air supplied by the fan 121, and then the compressed refrigerant is supplied to the receiver 13. The output refrigerant from the receiver 13 is expanded by the expansion valve 14 into a low-temperature refrigerant, and is supplied to the in-compartment heat exchanger 15 that controls the temperature inside the storage installed in the vehicle.

Here, a bypass passage is set in the expansion valve 14, and the first heating valve 16 is provided in the bypass passage.
Is provided. The heating valve 16 is controlled by control circuit means (not shown) so as to be opened in the heating control state of the storage and closed in the refrigeration control state. Will be supplied to the internal heat exchanger 14 via the expansion valve 14.
Then, in the heating control state, the refrigerant from the receiver 13 is not expanded, and has heat of compression, and the internal heat exchanger 15
Will be supplied to.

The output refrigerant from the internal heat exchanger 15 is fed back to the compressor 11 via the refrigeration valve 18 in the first refrigerant passage 17. A second refrigerant passage for heating control is provided in parallel with the first refrigerant circuit 17 having the refrigeration valve 18.
In the second refrigerant passage 19, a second heating valve 20, an expansion valve 21, and a cooling water heat exchanger 22 are set in series in the second refrigerant passage 19. The output refrigerant from the water heat exchanger 22 is returned to the refrigerant compressor 11. Here, the second heating valve 20 is set to open in conjunction with the first heating valve 16 in a heating control state set by control circuit means not shown in the drawing. , It is closed in the refrigeration control state.

In the portion of the cooling water heat exchanger 22, there is a cooling water passage 221 through which engine cooling water, which is adapted to circulate between the engine 23 and the radiator 24, is circulated and supplied as indicated by an arrow. It is set so as to exchange heat with the cooling water that circulates in the cooling water passage 221. That is, the cooling water heated in the engine 23 part is
25 is supplied to the cooling water passage 221 via
The heat exchanger 22 exchanges heat with the refrigerant, and the cooling water that has passed through the cooling water passage 221 is returned to the engine 23 portion.

Here, a bypass passage 26 is formed in parallel in the cooling water passage in which the heater core 25 exists, and water valves 27 and 28 are provided in the passage of the heater core 25 and the bypass passage 26, respectively. It is supposed to be provided. Here, 29 is a thermostat which controls the cooling water flowing through the radiator 24 in accordance with its temperature.

That is, in the refrigeration / warming control device configured as described above, the refrigerant compressor 11 is driven in the refrigeration or heating control state. Then, the compressed refrigerant is discharged from the refrigerant compressor 11, and the compressed refrigerant is heat-exchanged with the atmosphere in the condenser 12 and supplied to the receiver 13.

Here, the freezing control state in which the storage mounted in the vehicle is set to the freezing temperature will be described as an example. In this state, the first and second heating valves 14 and 20 are closed, and the freezing valve 18 is It is set to open.

Therefore, the high temperature / high pressure refrigerant compressed by the refrigerant compressor 11 is heat-exchanged with the atmosphere in the condenser 12 to be stored as the high temperature / high pressure liquid refrigerant in the receiver 13,
Further, the liquid refrigerant from the receiver 13 is supplied to the expansion valve 14 to be a low temperature / low pressure gas-liquid mixed refrigerant, and the internal heat exchanger 15
Will be supplied to. That is, the storage mounted on the vehicle is frozen. Then, the refrigerant that has become a gas in the heat exchanger 15 is cooled by the freezing valve 18
It is returned to the refrigerant compressor 11 via and the refrigeration control is continued.

Here, in the case of heating the cab, the water valve 27 is set to be closed and the water valve 28 is set to be opened,
The cooling water of the engine 23 is supplied to the heater core 25 and circulated.

When the storage is heated, the first and second heating valves 16 and 18 are set to open, and the freezing valve 18 is closed. In this state, the high-temperature and high-pressure gas refrigerant compressed by the refrigerant compressor 11 passes through the condenser 12 and the receiver 13 and further to the first
It is supplied to the internal heat exchanger 15 via the heating valve 16. That is, since a high temperature refrigerant is supplied to the internal heat exchanger 15, heat is dissipated in the internal heat exchanger 15 and the inside of the storage is heated.

Here, while detecting the refrigerant pressure at the inlet portion of the internal heat exchanger 15, for example, when the refrigerant pressure at the inlet portion of the internal heat exchanger 15 is below the set value, the cooling air flow to the condenser 12 When the sending fan 121 is controlled to be stopped, the refrigerant maintained at a high temperature is supplied into the internal heat exchanger 15, so that the heating temperature control can be effectively executed.

When the refrigerant pressure is above the set value, the fan 12
1 should be set to the operating state.

In this way, the high-temperature, high-pressure refrigerant that has passed through the internal heat exchanger 15 has the refrigeration valve 18 closed and the second heating valve 20 opened, so the second refrigerant passage 19
Will be supplied to. That is, the high-temperature / high-pressure refrigerant supplied to the second refrigerant passage 19 is converted into a low-temperature / low-pressure gas-liquid mixed refrigerant by the expansion valve 21 and supplied to the cooling water heat exchanger 22. become.

In the cooling water heat exchanger 22, engine cooling water that exchanges heat with the refrigerant is circulated in the cooling water passage 221. Therefore, the refrigerant flowing through the heat exchanger 22 is in a high temperature state. It becomes a gas state by exchanging heat with the engine cooling water. Then, the refrigerant that has passed through the heat exchanger 22 is returned to the refrigerant compressor 11, and efficient heating control is performed.

In this case, when the water valve 27 is set to be closed and the water valve 28 is set to be opened, cooling water in a high temperature state from the engine 23 flows to the heater core 25 through the cooling water passage 221.
The cab will be heated.

Here, the cooling water heat exchanger 22 is set on the downstream side of the heater core 25 because the heating cycle by the internal heat exchanger 15 is more affected by the temperature drop of the cooling water in the warm water state. Because it is smaller than 25. When you want to stop the heating of the cab by this heater core 25,
The water valve 28 may be closed and the water valve 27 may be opened so that the cooling water is circulated through the water valve 27 that bypasses the heater core 25.

In addition, there is a case where the temperature of the storage is significantly lowered and it is desired to rapidly raise the temperature in the storage. In such a case, the first and second heating valves 16 and 20 and the freezing valve 18 are set so as to be in the above heating state, and the water valve 28 is closed and the water valve 27 is opened to cool the cooling water. Flow through the heater core 25 so that the ability of the heating cycle by the cooling water is maximized. In this case, of course, the condenser fan 121 is stopped.

In this way, after the rapid rising operation of the heating operation,
The water valve 27 may be closed and the water valve 28 may be opened to return to the normal heating operation mode.

In the above embodiment, the selection of whether to pass the engine cooling water through the heater core 25 or through the bypass passage 26 has been described by controlling the water valves 27 and 28 reciprocally. However, this control can also be implemented by installing, for example, a two-way switching valve in the branch portion between the direction of the heater core 25 and the bypass passage 26, and various other means are conceivable.

[Effects of the Invention] As described above, in the refrigeration / heating control device according to the present invention, particularly in the heating control mode, the heating cycle by the engine cooling water is set, and efficient heating control of the storage is performed. Can be executed. At the same time, heating of the operating room can also be controlled normally by the cooling water heating cycle. Further, when the rising ability of the heating operation of the storage temperature is emphasized, the cooling water is not passed through the heater core. By controlling, the rising characteristic of the storage warming operation can be improved.

[Brief description of drawings]

The accompanying drawings are diagrams showing a configuration of a refrigeration cycle for explaining a refrigeration / heating control device mounted on a vehicle according to an embodiment of the present invention. 11 ... Refrigeration compressor, 14 ... Expansion valve, 15 ... Internal heat exchanger, 16, 20 ... First and second heating valves, 17, 19 ...
... first and second refrigerant passages, 18 ... refrigeration valve, 21 ...
… Expansion valve, 22 …… Cooling water heat exchanger, 23 …… Engine, 25
...... Heater core, 27, 28 …… Water valve, 221 …… Cooling water passage.

Claims (1)

(57) [Claims] 1. An expansion valve to which compressed refrigerant is supplied from a refrigerant compressor, and a first heating valve which is set in parallel with the expansion valve and is controlled to be closed during a freezing operation and opened during a heating operation. A refrigerant bypass passage having a temperature valve, a refrigerant that has passed through the expansion valve or the heating bypass passage is supplied, and an internal heat exchanger for cooling or heating the storage installed in the vehicle, and the internal heat exchanger. The output refrigerant from the heat exchanger is returned to the compressor, and a first refrigerant passage having a refrigeration valve set to open during the refrigerating operation and closed during heating is arranged in parallel with the first refrigerant passage. And a second heating valve provided in the same and controlled in the same manner as the first heating valve, an expansion valve to which the refrigerant that has passed through the second heating valve is supplied, and an output refrigerant from the expansion valve. Of the cooling water heat exchanger A second coolant passage provided, a heater core to which cooling water from the engine portion is supplied and which controls heating of the vehicle cab by the temperature of the cooling water, and a cooling water heat exchanger portion set in the second coolant passage A means for supplying the engine cooling water that has passed through the heater core and exchanging heat with the refrigerant flowing in the heat exchanger, a cooling water bypass passage provided in parallel with the heater core, the heater core or the cooling water bypass passage. Valve means for controlling the cooling water to pass through to only one side, and the cooling water passing through the heater core or the cooling water bypass passage returns to the engine part in accordance with the setting state of the valve means. A freezing / warming control device mounted on a vehicle characterized by the above.