JPH01300166A - Air-conditioner equipped with refrigerant heater - Google Patents

Abstract

PURPOSE:To make the air conditioning comfortable and have failure of the fuel supply indicated by setting up a refrigeration cycle by using a refrigerant heater which is equipped with a means of detecting a failure of the fuel supply and, in the case of a failure of the fuel supply during the heating operation by heating the refrigerant, permitting the operation to be switched to heat pump heating. CONSTITUTION:A circular connection is set up using a compressor 1, a four-way valve 2, an outdoor heat exchanger 6, a pressure reducer 5, a two-way valve 4, and an indoor heat exchanger 3 in sequence. The inlet of the indoor heat exchanger and the suction side of the compressor 1 are connected by interposing a two-way valve 7 and a refrigerant heater 8 therebetween in such a way as to set up a refrigeration cycle and a detector for detecting a failure of the fuel supply 10 is provided to the refrigerant heater 8; with this setup, for example the selection of the heating of the refrigerant for the heating operation sets the four-way valve 2, two-way valve 7, compressor 1, a pump 9 and the refrigerant heater 8 all operative so that the flow of the refrigerant effects the heating operation; in the case of detection of a failure of the fuel supply by the detector 10 during this heating operation, the two-way valve 7 and the refrigerant heater 8 are stopped from operating, whereas the two-way valve 4 is turned on, enabling a heat pump to function for the heating simultaneously the failure of the fuel supply is indicated on the indoor unit. hus the heating operation can be continued even when the supply of the fuel fails.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an air conditioner equipped with a refrigerant heating device.

BACKGROUND OF THE INVENTION In recent years, air conditioners equipped with refrigerant heating devices using gas or kerosene have been put into practical use.

A conventional example will be described below with reference to the drawings.

FIG. 3 is a refrigeration cycle diagram of an air conditioner equipped with a conventional refrigerant heating device using kerosene.

In Figure 3, 1 is a compressor, 2 is a four-way valve that switches the flow of refrigerant, 3 is an indoor heat exchanger on the user side, 4 is a two-way valve that controls the flow of refrigerant, 5 is a pressure reducer, and 6 is an outdoor valve. A heat exchanger, 7 a two-way valve that is opened when performing refrigerant heating and heating, 8 a refrigerant heater using kerosene combustion, and 9 a pump for supplying kerosene.

The operation of the air conditioner equipped with the refrigerant heating device configured as described above will be explained according to the flowchart of FIG. 4.

When you first start driving, select the driving mode. This includes button selection and automatic selection based on outside temperature. First, when cooling is selected, two-way valve 4 and compressor 1 are turned on, and the refrigerant flows in the direction of the broken line in Figure 3. First, compressor 1
The high-temperature, high-pressure refrigerant passes through the four-way valve 2 and enters the outdoor heat exchanger 6, where it radiates heat and becomes a high-pressure liquid.Then it becomes a low-pressure liquid that easily evaporates through the pressure reducer 5, passes through the two-way valve 4, and enters the indoor heat exchanger. Enter. At this point, the refrigerant begins to evaporate, and the refrigerant vapor that absorbs heat from the indoor air passes through the four-way valve 2 and returns to the compressor 1. If this refrigeration cycle continues to operate, the temperature of the indoor heat exchanger becomes low and air conditioning is possible. Furthermore, when heat pump heating is selected, the four-way valve 2, the two-way valve 4, and the compressor 1 are turned on, and the refrigerant flows in the direction indicated by the φ mark. The refrigerant that has become high temperature and high pressure in the compressor 1 passes through the four-way valve 2, flows to the indoor heat exchanger 3, releases heat and becomes a liquid, passes through the two-way valve 4, and is reduced in pressure to be easily evaporated by the pressure reducer 5. Outdoor heat exchanger 6
to go into. Here, it absorbs heat from the outside air, evaporates, and returns to the compressor 1 through the four-way valve 2. Here, the indoor heat exchanger 3, which is the user side, has a high temperature and high pressure and can perform heating.

Also, when refrigerant heating heating is selected, four-way valve 2, two-way valve 7,
By turning on the compressor 1, pump 9, and refrigerant heating device 8, the refrigerant flows in the direction of the solid arrow. The high temperature refrigerant leaving the compressor 1 passes through a four-way valve 2, radiates heat in an indoor heat exchanger 3, passes through a two-way valve 7, is heated by kerosene combustion in a refrigerant heating device 8, and returns to the compression rii1 again. in this case,
The compressor 1 simply functions as a refrigerant pump.

As mentioned above, cooling and heating, that is, heat pump heating and refrigerant heating, can be selected, but heat pump heating is efficient and has high capacity when the outside temperature is high, but when the outside temperature drops, the capacity decreases, and This has the disadvantage that frost builds up on the heat exchanger, requiring periodic defrosting work. On the other hand, refrigerant heating has the advantage that its capacity decreases depending on the outside temperature and does not require defrosting because it does not form frost, but it has the disadvantage that heating cannot be performed without kerosene as fuel.

Problems to be Solved by the Invention However, air conditioners equipped with a refrigerant heating device using kerosene, etc., as described above, have insufficient capacity for heat pump heating when the outside temperature becomes low, while refrigerant heating and heating using kerosene, etc. There was a problem that heating operations could not be performed if fuel such as kerosene ran out.

In view of the above-mentioned problems, the present invention provides a fuel exhaustion detector, and when fuel exhaustion is detected during refrigerant heating operation using fuel such as kerosene, the system switches to heat pump heating to continue heating operation and displays a fuel exhaustion display. It is something.

Means for Solving the Problems In order to solve the above problems, an air conditioner equipped with the refrigerant heating device of the present invention includes a compressor, a four-way valve, an outdoor heat exchanger, a pressure reducer, a two-way valve, and an indoor heat exchanger. are sequentially connected in an annular manner, and the inlet of the indoor heat exchanger and the suction side of the compressor are connected via a two-way valve and a refrigerant heating device to form a refrigeration cycle, and the refrigerant heating device is connected to detect fuel shortage. The heating device is characterized in that when the fuel shortage is detected during refrigerant heating and heating, the heating is switched to heat pump heating.

According to the above configuration, the present invention can provide a comfortable air conditioner in which the heating capacity does not decrease even when the outside temperature is low, and the heating operation is not interrupted even if the fuel runs out during refrigerant heating.

Embodiment An air conditioner equipped with a refrigerant heating device according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a refrigeration cycle diagram of this embodiment. Components that are the same as those in the conventional example are given the same numerals and explanations will be omitted. Numeral 10 is a fuel-out detector, and in the case of kerosene, various types such as a float switch type, a magnetic sensor type, and a level detection type are commercially available. FIG. 2 is a 70-chart of operations of the present invention. Here, since the cooling and heat pump heating are the same as in the conventional example, the explanation will be omitted. When refrigerant heating is selected, the four-way valve 4, the two-way valve 7, the compressor 1, the pump 9, and the refrigerant heating device 8 are all turned on, and the refrigerant flows in the direction of the solid arrow in Figure 1 to perform heating. This is the same as the conventional example. If fuel exhaustion is detected by the fuel exhaustion detector 10, the two-way valve 7 and the refrigerant heating device 8 are stopped, and the two-way valve 4 is turned on, so that the refrigerant flows in the direction indicated by the φ mark in FIG. Heat pump heating can be performed, and at the same time, a fuel exhaustion display is displayed indoors.

As described above, according to this embodiment, even when the fuel runs out, the heating operation is not stopped, and since the fuel runout is displayed, it is possible to notify the person quickly, and it is possible to replenish fuel such as kerosene. .

Effects of the Invention As described above, according to the present invention, even if a fuel shortage is detected during refrigerant heating operation using fuel such as kerosene, comfortable air conditioning can be achieved without stopping heating operation by quickly switching to heat pump heating. In addition, by displaying an indication that the fuel is out, it is possible to quickly inform the user that it is time to replenish fuel such as kerosene.

[Brief explanation of the drawing]

FIG. 1 is a refrigeration cycle diagram of this embodiment, FIG. 2 is an operation flowchart of this embodiment, and FIGS. 3 and 4 are a refrigeration cycle diagram and an operation flowchart of a conventional example, respectively. 1... Compressor, 2... Four-way valve, 3...
...Indoor heat exchanger, 4...Two-way valve, 5...
...Pressure reducer, 6...Outdoor heat exchanger, 7...
... Two-way valve, 8 ... Refrigerant heating device, 10.
... Fuel out detector. 1゛-Pressure 1@sign 2゛-°Four-way valve 3-Inside mold exchange path 4・-21 valve 5-Pressure reducing port 6-...Outdoor heat exchanger 7-Two-way valve 8-"°Refrigerant power # !Device lo-e p+cut detection Fig. 11 Fig. 2 Fig. 3r″I

Claims (1)

[Claims] A compressor, a four-way valve, an outdoor heat exchanger, a pressure reducer, a two-way valve, and an indoor heat exchanger are sequentially connected in a ring, and the inlet of the indoor heat exchanger and the suction side of the compressor are connected to the two-way valve and the refrigerant heating. The refrigerant heating device is connected through a device to form a refrigeration cycle, and the refrigerant heating device is equipped with a fuel exhaustion detector, and when the fuel exhaustion is detected during refrigerant heating and heating, the refrigerant heating device switches to heat pump heating. air conditioner.