JPH02150649A - Refrigerant heating type cooler/heater - Google Patents

Abstract

PURPOSE:To minimize a refrigerant recovering operation by providing a controller that switches a four-way valve to a corresponding heating or cooling position only when an operation mode is changed over from cooling to heating, and vice versa. CONSTITUTION:A controller 13 switches the cooling and heating positions of a four-way valve 2 only when the operation modes of cooling and heating are changed over by a remote controller 14. At the time t1 when the cooling operation mode is changed over to the heating operation mode by the remote controller 14 and an operation switch is turned ON, the controller 13 changes over the four-way valve 2 to the heating position to close a check valve 9 and recovers gas for about one minute thirty seconds and, thereafter, the refrigerant heating operation of a compressor 1 is carried out. At the time t2 during which a heating cycle position is kept, a remote control switch is turned OFF to stop a heating operation, and the controller 13 retains the four-way valve 2 in the state of the heating position because of an instruction different from a cooling/heating changeover instruction. That is, even if the operation switch is again turned ON while the operation mode is being kept in a heating condition, the gas recovering operation is not carried out and the refrigerant heating operation is immediately started, since the four-way valve is left in the heating position.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a refrigerant-heating type air-conditioning machine in which a refrigerant heater for heating is incorporated in a refrigeration cycle.

(Conventional technology) A conventional refrigerant heating type air conditioner will be explained with reference to FIG.

From the compression lla, the four-way valve b, the outdoor heat exchanger C1 pressure reducing device d, the check valve e, and the indoor heat exchanger f are connected in this order to form a cooling cycle g.

From compression 11a, four-way valve b, indoor heat exchanger f, two-way valve h
, refrigerant heater i are connected in order to form a heating cycle j.

First, during cooling, the refrigerant flows from the compressor a through the four-way valve to the outdoor heat exchanger C, as shown by the solid arrow in the figure, and after being condensed there, it is depressurized by the depressurizer d. The air flows through the check valve e to the indoor heat exchanger f, where it evaporates and cools the room, and then returns to the compressor a via the four-way valve k and the check valve k. In addition, the flow of refrigerant during heating is at a pressure of 11f, as shown by the dotted arrow in the figure.
It flows from the flllia to the indoor heat exchanger f via the four-way valve, where it is condensed to heat the room, and then flows through the three-way valve to the refrigerant heater i, where it is evaporated by heating by the burner 1 and sent to the compressor. It is designed to return to a.

In this refrigerant-heated air conditioner, heating and cooling are switched by a four-way valve, and the four-way valve is non-energized (OF).
In case F), the four-way valve becomes a cooling cycle g in which the air flows from the discharge side of the compressor a to the outdoor heat exchanger C, as shown by the solid line b1 in the figure. Also, excitation (ON) of the four-way valve
>Sometimes, as shown by the illustrated dotted line b2, the heating cycle j flows from the discharge side of the compressor a to the indoor exchanger f.
becomes.

As shown at times tl and t2 in Fig. 4, conventionally, when heating operation is started using the remote control switch, the four-way valve is always turned on (heating position).
Then, a refrigerant recovery operation is performed to pump the refrigerant from the outdoor heat exchanger C to the heating cycle j side. Further, this refrigerant recovery operation is always performed when the heating operation is interrupted by the remote control switch (remote control switch 0FF).

(Problem to be solved by the invention) However, when the heating operation is stopped during heating, the four-way valve is turned OFF, so the cooling cycle is switched to the cooling cycle g, and the high-temperature and high-pressure refrigerant of the compressor a immediately after the stop is A large amount of refrigerant flows into the outdoor heat exchange ac through the line b1 during cooling, and there is a problem that the amount of refrigerant circulating in the heating cycle j becomes insufficient at the time of restart.

For this reason, when heating operation starts, it is always necessary to wait a certain period of time (for example, 1
By closing the three-way valve on the inlet/outlet side of the refrigerant heater 1 for 30 seconds and operating the pressure alla, the refrigerant accumulated in the outdoor heat exchanger C is transferred to the pressure eJ via the four-way valve b and the check valve k. After returning to machine a and recovering the refrigerant, three-way valve i is opened to perform heating operation.

However, in this method, the heating start-up is delayed by the gas recovery operation time (approximately 1 minute and 30 seconds). Furthermore, when gas is recovered, the pressure may become negative or negative, and refrigerant recovery operation must be performed frequently each time heating is performed, making it difficult to ensure the durability and reliability of the compressor.

The present invention has been made in consideration of the above circumstances, and an object of the present invention is to provide a refrigerant-heating type air-conditioner/heater that can minimize the refrigerant recovery operation.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides a heating cycle in which a compressor, an indoor heat exchanger, and a refrigerant heater are sequentially connected, the compressor, an outdoor heat exchanger,
In a refrigerant-heated air conditioner/heater in which a four-way valve is used to switch between a cooling cycle in which a pressure reducing device and the indoor heat exchanger are sequentially connected, the four-way valve is switched only when the operation mode is switched from cooling to heating or vice versa. It is constructed by providing a control device for switching to the corresponding heating or cooling position.

(Function) When operating a switch using a remote control, etc. of a refrigerant-heated air conditioner/heater, the position of the four-way valve will not change even if the operation switch is turned ON or OFF, unless the operation mode is changed from cooling to heating or vice versa. Therefore, when the remote control switch is in the heating operation mode position, the gas recovery operation is not performed even if the heating operation is turned on and off using the remote control switch. Therefore, the heating start-up speed becomes faster, and the durability and reliability of the compressor are improved.

(Example) An example of the present invention will be described below with reference to FIGS. 1 and 2.

Figure 1 shows the refrigeration cycle of a refrigerant-heated air conditioner. 1 is a compressor, 2 is a four-way valve, 3 is an outdoor heat exchanger, and 4 is a refrigeration cycle.
5 is an indoor heat exchanger, 5 is a refrigerant heater, and 6 is a pressure reducing device.

First, when the four-way valve 2 is not energized (OFF), it is in the switching position shown by the solid line 2a in the figure, and forms the cooling cycle 10 in which the compressor 111 flows from the discharge side to the outdoor heat exchanger 3. That is, an outdoor heat exchanger 3, a pressure reducing device 6, a check valve 11, and an indoor heat exchanger 4 are connected in this order through a four-way valve 2 from the discharge side of 1 fil of compression, and then through a four-way valve 2 and a check valve 7. The suction side of the compressor 1 is connected. Also, when the four-way valve 2 is excited (ON), the dotted line 2 shown in the figure
It is in the switching position indicated by b, forming a heating cycle 8 that flows from the discharge side of the compressor 1 to the indoor exchanger 4. That is, the indoor heat exchanger 4 is connected to the discharge side of the compressor 1 via the four-way valve 2, and further connected to the suction side of the compressor 1 via the three-way valve 9° refrigerant heater 5. The refrigerant heater 5 also includes a burner 12 for heating and evaporating the condensed refrigerant passing through the refrigerant heater 5.

13 is a control device which receives commands from the remote controller 14 to switch the operating modes of the air conditioner/heater, such as cooling, heating, and blowing air, and to control compression I! 1, ON/OFF of the four-way valve 2, opening/closing control of the two-way valve 9 during refrigerant recovery, etc.

Next, the operation of the above configuration will be explained.

The control device 13 cools the air conditioner using the remote control 14.

Only when the heating operation mode is switched, the cooling/heating position of the four-way valve 2 is switched.

FIG. 2 shows an example of this, and time t1 indicates the point in time when the remote controller 14 switches from cooling to heating operation mode and turns on the operation switch.

In response to this heating/cooling switching command, the control device 13 first switches the four-way valve 2 to the ONL heating position, closes the check valve 9, recovers gas for about 1 minute and 30 seconds, and then recovers the refrigerant in the compressed ja1. Perform heating operation.

Next, time t while in the heating cycle position
2, even if the heating operation is stopped by turning off the remote control switch, the control device 13 maintains the four-way valve 2 in the heating position because the command is different from the heating/cooling switching command. That is, even if the operation switch is turned ON again while the operation mode remains heating, the four-way valve remains in the heating position, so the gas recovery operation is not performed and the refrigerant heating operation is immediately started.

Note that if the operation mode is the refrigerant position, the four-way valve 2 remains in the cooling position as before.

In this way, the four-way valve 2 is configured to switch only when the operation mode of the remote controller 14 is switched from cooling to heating or from heating to cooling. Therefore, according to the above embodiment, the following effects can be obtained.

(1) If in heating mode, turn the operation switch on the remote control to 0.
Even if it is N-OFF, the gas recovery operation is not performed. Therefore, the rising speed becomes faster.

(2) Excess gas recovery is reduced, thus improving compressor reliability.

[Effects of the Invention] As described above, in the present invention, as long as the operating mode of the operation switch of the refrigerant heating type air conditioner is in the heating operation position, the four-way valve does not switch between the cooling position and the heating position. In addition to increasing the speed, the frequency of refrigerant recovery operations can be completely reduced, improving the durability and reliability of the compressor.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration of a refrigerant heating type air-conditioning machine of the present invention,
FIG. 2 is a diagram showing the switching operation of the four-way valve, FIG. 3 is a refrigeration cycle diagram of a conventional refrigerant heating type air-conditioning machine, and FIG. 4 is an operation diagram of the conventional four-way valve. In the figure, 1 is a compressor, 2 is a four-way valve, 3 is an outdoor heat exchanger, 4
is an indoor heat exchanger, 5 is a refrigerant heater, 8 is a heating cycle,
9 is a three-way valve, 10 is a cooling cycle, 11 is a check valve, 13
indicates a control device, and 14 indicates a remote control.

Claims (1)

[Claims] 1. A heating cycle in which a compressor, an indoor heat exchanger, and a refrigerant heater are connected in sequence, and a cooling cycle in which the compressor, an outdoor heat exchanger, a pressure reducing device, and the indoor heat exchanger are connected in sequence, are connected in four directions. A refrigerant-heating type air-conditioning machine that is switched by a valve, characterized in that it is equipped with a control device that switches a four-way valve to a corresponding heating or cooling position only when the operating mode is switched from cooling to heating or vice versa. Heating air conditioner.