JPH02254262A - Air conditioner - Google Patents

Abstract

PURPOSE:To enable execution of delicate heating operation having a reduced fluctuation in a room temperature by a method wherein a restarting delay time of a compressor during heating operation is set to a value lower than that during cooling operation. CONSTITUTION:A compressor restarting control means 12 restarts (ON) operation of a compressor 3 after operation of the compressor is temporarily stopped (OFF) according to a cooling and a heating load in an air conditioning room in which 8 indoor heat exchanger 6 is mounted, and sets a restarting delay time of the compressor 3 during heating operation to a value lower than that during cooling operation. The compressor restarting control means is linked to the compressor 3. As noted above, by setting a restarting delay time t2 of the compressor during heating operation of the compressor restarting control means 12 for controlling operation and the stop of the compressor 3 to a value lower than that during cooling operation, operation and the stop of the compressor 3 can be controlled at a short delay time during heating operation, and delicate heating having a reduced fluctuation in a room temperature can be achieved.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to an air conditioner using a refrigeration cycle, and particularly relates to an air conditioner using a refrigeration cycle, and particularly relates to a refrigerant flowing out from an indoor heat exchanger (condenser) during heating operation. is heated and vaporized and flows into the pressure M machine, reducing the pressure difference between the high pressure side pressure on the discharge side of the compressor and the low pressure side pressure on the suction side of the compressor, thereby reducing the delay during heating of the pressure A machine. The present invention relates to an air conditioner that performs heating with small fluctuations in room temperature by setting the time shorter than that for cooling.

(Prior Art) A heat pump type air conditioner that uses a refrigeration cycle is known as an air conditioner that cools and heats an air-conditioned room. As shown in Figure 3, this air conditioner consists of a compressor a that compresses refrigerant into high-temperature, high-pressure gas, and a condenser that condenses the refrigerant compressed into high-temperature, high-pressure gas. A constrictor C1 to evaporate and an evaporator d to evaporate the depressurized refrigerant are sequentially connected by refrigerant piping, and a four-way valve e controls the flow of refrigerant flowing through the piping during cooling operation and heating operation. During cooling operation, the evaporator is used as an indoor heat exchanger, and during heating operation, the above all
The air conditioner is used as an indoor heat exchanger to cool and heat the air conditioned room.The above air conditioner is equipped with a thermocut (not shown) to maintain the temperature inside the air conditioned room at a desired constant temperature. Compressor a was operated and stopped based on the set temperature of the thermostat.

That is, when the thermostat is turned off, the compression lla is stopped and cooling or heating in the air-conditioned room is stopped, and when the thermostat is restored, the compressor a is restarted and cooling or heating in the air-conditioned room is started.

Due to fluctuations in the air conditioner room temperature, the above thermostat may
When the operation is temporarily stopped (OFF) and restarted (ON), as shown in Fig. 4, the pressure Pd on the high pressure side, which is the discharge side of the compressor a, and the pressure Pd on the suction side, with the compressor a in between, are 2 minutes and 30 seconds to equilibrate the pressure Ps on the low pressure side.
A constant pressure m machine delay time 1+ of about 3 minutes was provided. This is due to the fact that if there is a pressure difference between the suction side and the discharge side of the pressure machine a, a large load is applied when starting the compression tlAa.

(Problems to be Solved by the Invention) Even with an inverter type compressor in which the compressor capacity is variable, the thermostat may be turned off to stop the pressure Mj machine due to fluctuations in the heating and cooling load in the air conditioned room. If the thermostat is turned off and the operation of compressor $1a is temporarily stopped, and the thermostat is restored to restart compressor a within the compressor delay time (tI: about 2 minutes and 30 seconds to 3 minutes), immediately The compression fia will not be operated and will be restarted after the remaining stop time.

In other words, when the pressure mata repeats operation and stop, the fourth
As shown in the figure, the high-pressure side pressure Pd on the discharge side and the low-pressure side pressure ps on the suction side of the pressure m machine that constitutes the refrigeration cycle.
In order to balance this, restarting cannot be performed unless there is a certain delay time t1 of at least 2 minutes and 30 seconds to 3 minutes between stopping and restarting, and during this time the air conditioner room temperature fluctuates greatly. There was a problem with it.

The purpose of the present invention, which was created to solve the above problems, is to
By heating the refrigerant that flows out of the indoor heat exchanger during heating operation and letting it flow into the compressor, the pressure difference between the high pressure side (the discharge side) and the low pressure side (the suction side) of the compressor is reduced.
Set the compressor stop time during heating to be shorter than during cooling,
The present invention provides an air conditioner that enables heating operation with less detailed room temperature fluctuations.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention sequentially connects a compressor, an outdoor heat exchanger, a diaphragm, and an indoor heat exchanger constituting a refrigeration cycle to refrigerant piping. In an air conditioner equipped with a refrigerant heater that reverses the flow of refrigerant during heating operation and heats and vaporizes the refrigerant flowing out from the indoor heat exchanger and flows into the compressor, the compressor during heating operation The compressor restart control means is provided to set the restart delay time of the compressor to be shorter than that during cooling operation.

(Function) During heating operation, the gas refrigerant heated and evaporated by the refrigerant heater flows into the pressure S machine, which reduces the pressure difference between the discharge side and the suction side of the compressor, causing the pressure A machine to stop. The pressure equilibration time within the refrigeration cycle is shortened.

Since we have provided a compressor restart control means that sets the compressor restart delay time during heating operation to be shorter than that during cooling operation in accordance with the pressure equilibrium time during heating operation, pressure It is possible to control the operation and stop of the machine a, and it is possible to achieve detailed heating with small room temperature fluctuations.

(Example) An embodiment of the present invention will be described with reference to the accompanying drawings.

As shown in FIG. 1, this air conditioner using a refrigeration cycle is mainly composed of a cooling circuit 1 shown by a broken line that performs cooling, and a heating circuit 2 shown by a solid line that performs heating.

The cooling circuit 1 shown by the broken line includes a compressor 3 that compresses the refrigerant into high-temperature, high-pressure gas along the flow of the refrigerant, and an outdoor heat exchanger 4 as a cooling condenser that condenses the compressed refrigerant.
A capillary tube 5 that depressurizes the condensed refrigerant and an indoor heat exchanger 6 that serves as an evaporator that evaporates the depressurized refrigerant are sequentially connected by refrigerant piping.

In addition, the heating circuit 2 shown by the solid line follows the flow of the refrigerant.
The compressor 3, the indoor heat exchanger 6 as a heating AHA device, and the refrigerant heater 7 that heats the refrigerant flowing out from the indoor heat exchanger 6 and causes it to flow into the compressor 3 are sequentially connected to refrigerant piping. are connected and configured.

The indoor heat exchanger 6 is used as an evaporator in the cooling circuit 1, and is also used as a condenser in the heating circuit 2.

Further, a four-way valve 8 is provided in the middle of the refrigerant piping to switch between the cooling circuit 1 and the heating circuit 2 by reversing the flow of the refrigerant, and the cooling circuit 1 and the heating circuit 2 are connected to each other. Check valves 9,10 and two-way valves 11 are provided to prevent interference.

In addition, depending on the heating and cooling load in the air-conditioned room in which the indoor heat exchanger 6 is installed, the operation of the compressor 3 is stopped (OFF) for a certain period of time and then started (ON) again, and the operation of the compressor 3 during heating operation is stopped (OFF) and then restarted (ON). Compressor restart control means 12 that sets the restart delay time to be shorter than that during cooling operation is provided in link with the pressure BR3.

The operation of this embodiment having the above configuration will be described.

During heating operation, the four-way valve 8 shown in FIG. 1 is switched to the state shown by the solid line, and the two-way valve J1 is opened to cause the refrigerant to flow in the heating circuit 2 shown by the solid line in the figure.

Then, the high temperature and high pressure gas refrigerant flowing out from the compressor 3 is
Indoor heat exchanger 6 which is a heating condenser via four-way valve 8
It flows into the air conditioner, exchanges heat with the air in the air conditioned room, and is condensed and liquefied.

At this time, the air conditioned room will be heated. This condensed and liquefied refrigerant flows into the refrigerant heater 7 via the two-way valve 11, is heated and evaporated by the burner 13, stores heat that is insufficient by the capacity of the compressor 3, and returns to compression tR3.

Since the refrigerant flowing into the pressure am is heated and evaporated by the refrigerant heater 7, as shown in FIG. The pressure difference with the refrigerant pressure ps is smaller than the pressure difference of the straight bomb type shown in FIG.

Therefore, the pressure equilibrium time of the refrigerant in the heating circuit 2 after the compression fi3 is stopped is shortened. In line with this shortened pressure equilibrium time, the compressor restart control means 12 that controls the operation and stop of the compressor 3 sets the restart delay time t2 of the compressor m machine during heating operation to be shorter than during cooling operation. Since this is set, compression tl can be achieved with a short delay time during heating operation! 13 can be controlled, and heating with small room temperature fluctuations can be achieved.

That is, when comparing the compressor delay time t2 according to this embodiment shown in FIG. 2 and the restart delay time of the heat pump type pressure 1a machine shown in FIG. This shortened compressor delay time makes it possible to provide comfortable heating with small temperature fluctuations6.
On the other hand, during cooling operation, the west valve 8 shown in FIG. 1 is switched to the state shown by the broken line, and the two-way valve 11 is closed, so that the refrigerant flows through the cooling circuit 1 shown by the broken line in the figure.

Then, the high-temperature, high-pressure gas refrigerant flowing out from the compression 1f%3 flows into the outdoor heat exchanger 4 as a cooling condenser via the four-way valve 8, becomes an a-ray source, passes through the capillary tube 5, and is depressurized. Indoor heat exchanger 6 as an evaporator for cooling
The air flows into the room, where it exchanges heat with the indoor air and cools the air-conditioned room. The refrigerant flowing out from the indoor heat exchanger 6 returns to the four-way valve 8.
Return to pressure 1a machine 3 via .

[Effects of the Invention] As explained above, according to the present invention, the following excellent effects can be exhibited.

(1) Comfortable heating with small temperature fluctuations can be achieved.

(2) It has a simple structure, exhibits excellent effects, can be easily adopted in existing air conditioners of this type, and is highly versatile.

[Brief explanation of drawings]

Fig. 1 is a schematic circuit diagram of an air conditioner showing an embodiment of the present invention, and Fig. 2 shows the high-pressure side refrigerant pressure and low-pressure side refrigerant pressure of the air conditioner shown in Fig. 1, and the restart delay of the pressure a machine. A pressure-time graph showing the relationship with time, Fig. 3 is a schematic circuit diagram of a conventional air conditioner, and Fig. 4 shows the high-pressure side refrigerant pressure and low-pressure side refrigerant pressure of the air conditioner shown in Fig. 3. It is a pressure-time graph showing the relationship with the restart delay time of the compressor. In the figure, 6 is the indoor heat exchanger, 3 is the compressor, 7 is the refrigerant heater, t2 is the restart delay time of pressure #1 machine during heating operation, 12
is the compressor restart control means. Patent applicant: Toshiba Corporation Patent attorney: Nobuo Kinutani

Claims (1)

[Claims] 1. Connect the compressor, outdoor heat exchanger, diaphragm, and indoor heat exchanger that make up the refrigeration cycle through refrigerant piping, and reverse the flow of the refrigerant during heating operation so that the refrigerant flows out from the indoor heat exchanger. In an air conditioner equipped with a refrigerant heater that heats and vaporizes refrigerant and flows into the compressor, the air conditioner is equipped with a compressor restart control means that sets a compressor restart delay time during heating operation to be shorter than during cooling operation. An air conditioner characterized by: