JPS6199068A - Heat pump device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention brings at least a portion of an internal combustion engine into contact with a heating medium in a heating medium, and drives a compressor of a refrigeration circuit in the internal combustion engine. The present invention relates to a heat pump device.

[Conventional technology]

Conventionally, this type of heat pump device accommodates a heat medium 2 in a heat medium tank 1, as shown in FIG.

A part of the internal combustion engine 3 is brought into contact with the heating medium 2, and the heating medium 2 is heated by the heat generated by the internal combustion engine 3 during operation. Further, the shaft of the internal combustion engine 3 is directly connected to the shaft of the compressor 4 constituting the refrigeration circuit by a coupling method, etc.
The internal combustion engine 3 drives the υ compressor 4.

The refrigeration circuit includes a condenser 5 immersed in the lower part of the heat medium tank 1 in order to condense the high-temperature high-pressure refrigerant discharged from the compressor 4 and heat the heat medium 2, and a refrigerant sent out from the condenser 5. a first refrigerant circuit including a first solenoid valve 7 and a first expansion valve 8 for guiding the refrigerant to the outdoor heat exchanger 9; A second solenoid valve 11 and a second solenoid valve for guiding the refrigerant.
The second refrigerant circuit includes an expansion valve 12 , and a third refrigerant circuit that sends saturated vapor evaporated in the double-tube heat exchanger 15 to the compressor 4 . Also, 6°10 is a liquid receiver, and 14 is a capillary tube.

13.17 is a solenoid valve. Reference numeral 16 denotes a pump for circulating the heat medium in the outer tube, which has undergone heat exchange with the refrigerant flowing in the inner tube, to a fan coil unit (not shown) in the double tube heat exchanger 15.

A temperature sensor 18 is provided in the internal combustion engine 3 and the heat medium 2, and its detection signal is sent to a controller 19 for managing the internal combustion engine. The internal combustion engine management controller 19 receives the detection signal and the control signal from the system controller 20, and controls starting and stopping of the internal combustion engine 3 via the signal line 21.

Therefore, when the temperature in the heat medium 2 becomes too high or when the temperature of the internal combustion engine 3 becomes too high, the internal combustion engine management controller 19 sends out a stop signal via the signal line 21, and The internal combustion engine 3 then stops. At this time, the compressor 4 is also stopped because it is directly connected to the internal combustion engine 3.

Also, although not shown, it is used to protect the refrigeration circuit.

Protects the refrigeration circuit.

[Problem that the invention seeks to solve]

According to such a configuration, every time an abnormality occurs in the refrigeration circuit, not only the compressor 9 but also the internal combustion engine must be stopped. This increase in the number of times the internal combustion engine is turned on and off is undesirable because it shortens the life of the internal combustion engine. Furthermore, since a large amount of electric power is consumed when starting the internal combustion engine, the life of the battery for the internal combustion engine is also shortened.

[Means and effects for solving the problems] The heat pump device according to the present invention has a power transmission device such as an electromagnetic suction clutch device interposed between the shaft of the internal combustion engine and the shaft of the compressor, and is connected to the refrigeration circuit. A temperature sensor and a pressure sensor are provided to detect the state temperature and state pressure of the refrigeration circuit, and the behavior of the refrigerant in the refrigeration circuit is managed based on detection signals from the temperature sensor and pressure sensor, and an abnormality is determined. At the same time, means is provided for sending a stop signal to the power transmission device, and when the power transmission device receives the stop signal, the power transmission device can cancel the power transmission and stop the operation of the compressor while the internal combustion engine is being operated. It is characterized by what it did.

〔Example〕

The present invention will be described in detail below with reference to two drawings.

FIG. 1 is a diagram showing the configuration of an embodiment of a heat pump device according to the present invention, and parts having the same functions as those in FIG. 3 are given the same reference numerals. The difference from Fig. 3 is that the compressor 4
A power transmission device 26 such as an electromagnetic suction clutch device is interposed between the shaft of the internal combustion engine 3 and the shaft of the internal combustion engine 3. Further, a pressure/temperature sensor 24 for detecting the pressure P1 and temperature T1 is provided at the discharge port of the compressor 4, and a pressure/temperature sensor 24 is provided at the outlet of the double tube heat exchanger 15.

A temperature sensor that detects that temperature T2? 25 are provided. Detection signals detected by the pressure temperature sensor 24 and temperature sensor 25 are sent to the refrigeration circuit management controller 23. The refrigeration circuit management controller 23 receives these detection signals and the control signal from the system controller 20, and turns on/off the power transmission device 26 via the signal line 22.
Control off.

FIG. 2 is a flowchart showing an example of the processing operation of the refrigeration circuit management controller 23.

That is, the refrigeration circuit management controller 23 determines that the pressure Pl at the discharge port of the compressor 4 is 23 kf7'cm 2 ·G or more,
The same quality Tl is 120℃ or more or double tube type heat exchanger 1
When the output temperature T2 of No. 5 becomes 117° C. or less, an off signal is sent to the power transmission device 26 via the signal line 22. When the power transmission device 26 receives the off signal, the compressor 4
The power transmission between the shaft of the internal combustion engine 3 and the shaft of the internal combustion engine 3 is canceled, only the compressor 4 is stopped without stopping the operation of the internal combustion B-mechanism 3, and the cycle operation of the refrigeration circuit is stopped.

Note that by increasing the number of temperature centimeters and pressure sensors provided in the refrigeration circuit, the behavior of the refrigerant in the refrigeration circuit can be managed in detail, and the safety of the refrigeration circuit can be improved.

Furthermore, it is not just a problem with the refrigeration circuit, but also an excess or shortage of refrigerant flowing through the refrigeration circuit.

Occurs due to overfilling, refrigerant leakage, etc. It is also possible to prevent failures due to abnormal operation of the compressor and internal combustion engine.

Furthermore, it goes without saying that the controllers 19, 20, and 23 may be constituted by one controller, for example, a one-chip microcomputer.

〔Effect of the invention〕

According to one aspect of the present invention, as is clear from the above description.

Since the drive of the compressor can be controlled independently of the internal combustion engine, the refrigeration circuit can be protected without stopping the internal combustion engine. Therefore, once installed, the internal combustion engine can be used for a long period of time.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing the configuration of an embodiment of a heat pump device according to the present invention, and FIG. 2 is a 70-chart showing an example of the processing operation of the refrigeration circuit management controller of FIG. 1.
FIG. 4 is a circuit diagram showing the configuration of a conventional heat pump device. 1... Heat medium tank, 2... Heat medium, 3... Internal combustion engine, 4
...Compressor, 18...Temperature sensor for internal combustion engine management,
19... Controller for internal combustion engine management, 20... System controller, 21... Signal line for internal combustion engine management, 22... Signal line for refrigeration circuit management, 23... Controller for refrigeration circuit management, 24 ...Pressure temperature sensor, 2
5...Temperature sensor, 26...Power transmission device Fig. 2 Fig. 3

Claims (1)

[Claims] 1. In a heat pump device in which at least a portion of an internal combustion engine is brought into contact with a heating medium in a heating medium tank, and a compressor of a refrigeration circuit is driven by the internal combustion engine, a shaft of the internal combustion engine and a shaft of the compressor are connected. A power transmission device is interposed between the refrigeration circuit, and the refrigeration circuit is provided with a temperature sensor and a pressure sensor for detecting the state temperature and pressure of the refrigeration circuit. A heat pump device comprising means for managing the behavior of refrigerant in the circuit and sending a stop signal to the power transmission device when an abnormality is determined.