JP2001304649A - Air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly restart heating operation. SOLUTION: In the control device of this air conditioner, that forms a refrigeration cycle by connecting an outdoor machine having a compressor for varying speed in multiple steps, a four-way valve, an outdoor heat exchanger, an outdoor control device, and the like, and an indoor machine having an indoor heat exchanger, a fan, an indoor control device, and the like using refrigerant piping and a tie electric wire, and provides a refrigerant-heating device that heats one portion of the refrigeration cycle in the outdoor machine, a delay operation means for operating the compressor at a low speed for a specific period of time when heating operation is stopped, and for inhibiting re-operation for a fixed period of time after the compressor is stopped, and a compressor operation judgment part for judging whether the compressor is operating are provided, and a heating re-operation function for judging whether the compressor is operating currently by a compressor operation judgment part, if a re- operation command is received from the indoor control room during the delay operation, for resuming the operation of the refrigerant-heating device by allowing the compressor to return to a high operation speed while the compressor is in operation, and for continuing the delay operation, if the compressor is stopped are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner in which an outdoor unit is provided with a refrigerant heating device using kerosene or the like as fuel, and a heating operation is performed by heating a part of a refrigeration cycle by a burner of the refrigerant heating device. It is about.

[0002]

2. Description of the Related Art Conventionally, in this type of air conditioner, the refrigeration circuit and the refrigerant temporarily become high in temperature due to residual heat when heating is stopped, and the heating operation is stopped in order to prevent the occurrence of failure due to deterioration of the refrigerant. At times, the compressor was stopped after the delayed operation of the compressor was performed until the refrigeration circuit cooled.

[0003]

However, in such a conventional air conditioner, when the user operates the operation unit such as the remote controller by mistake and does not want to stop the heating operation, the user can stop the heating operation. When the delay operation is started, the delay operation is continued even if the restart operation is performed immediately, the compressor is temporarily stopped, and then the compressor breaks down when restarting due to the residual pressure of the refrigeration circuit. Since restarting is started after the restart prohibition time after stopping the compressor for about 2.5 minutes, which is provided to prevent the indoor unit, it takes a considerable time for the indoor unit to return to normal heating operation. In the meantime, there is a problem that the room temperature is lowered and the user feels uncomfortable.

[0004]

In order to solve the above-mentioned drawbacks, the present invention focuses on this point. In particular, the present invention is made up of a compressor, a four-way valve, an outdoor heat exchanger, and an outdoor control capable of changing the rotational speed in multiple stages. A refrigeration cycle is formed by connecting an outdoor unit equipped with a device and an indoor unit equipped with an indoor heat exchanger, a fan, an indoor control device, and the like with a refrigerant pipe and a connecting wire, and heats a part of the refrigeration cycle. In the control device of the air conditioner in which the refrigerant heating device is provided in the outdoor unit, when the heating operation is stopped, the compressor is operated at a low speed for a predetermined time, and after a stop of the compressor, a delay for not performing the re-operation for a certain period of time. An operation means and a compressor operation determination unit for determining whether the compressor is operating are provided. If a re-operation command is issued from the indoor control device during the delayed operation, the compressor operation determination unit Is operating, and if the compressor is operating Compressor are those returning to the operating rotational speed of the high rotation and restarts the operation of the refrigerant heating apparatus, the compressor is provided with a heating operated again function to continue the delay operation if stopped.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. Reference numeral 1 denotes an indoor unit of an air conditioner, which is installed on a wall or the like in a room and has a fin tube type indoor heat exchange therein. The unit 2 is connected to the indoor fan 3 of the cross-flow type, the indoor motor 4 for rotating the indoor fan 3, the indoor motor 4, the display lamp 5, the receiving device 7 of the wireless remote controller 6 and the like, and controls the operation of the indoor unit 1. An indoor control device 8 is provided to adjust the temperature of indoor air by sucking indoor air and exchanging heat to return the indoor air.

Reference numeral 9 denotes an outdoor unit which is installed outdoors and is connected to the indoor unit 1 through a wall or the like by a connecting pipe 10 and a connecting wire 11, and has a four-way valve for switching between a compressor 12 and a refrigeration circuit inside. 13, a fin tube type outdoor heat exchanger 14, a pressure reducing device 15 such as a capillary tube, a refrigerant heating device 16, etc., and the compressor 12, the four-way valve 13, the outdoor heat exchanger 14, the pressure reducing device 15, the indoor heat A refrigeration circuit is formed by sequentially connecting the exchangers 2 with refrigerant pipes, and a bypass circuit 18 having the refrigerant heating device 16 and the two-way valve 17 is formed in parallel with the outdoor heat exchanger 14 and the pressure reducing device 15. I have.

The display lamp 5 includes an operation lamp 19 which lights up during operation, a refueling lamp 20 which lights up or blinks to indicate fuel shortage, a timer lamp 21 which lights up during timer operation, and the like. It informs the user.

The temperature of the wireless remote controller 6 can be raised and lowered by the operation switch 22 and the two buttons which start the operation by the first press and enter the stop operation by the second press.
A time setting switch 23, a course selection switch 24 for selecting an operation course such as a cooling / heating / dehumidifying operation, and the temperature / temperature
A timer switch 25 capable of stopping and operating the air conditioner after the time set by the time setting switch 23
It has.

The four-way valve 13 is for switching a refrigeration circuit between a cooling operation and a heating operation. When switching from cooling to heating, the two-way valve 17 is closed and the four-way valve 17 is opened. The valve 13 is switched, and the refrigerant is bypassed to the bypass circuit 18 without the refrigerant flowing to the outdoor heat exchanger 14 by the action of the check valve 26 provided between the outdoor heat exchanger 14 and the pressure reducing device 15. The kerosene is burned by the refrigerant heating device 16 provided in the bypass circuit 18 to heat the refrigerant, so that the insufficient heating capacity can be sufficiently ensured.

The refrigerant heating device 16 includes a heating heat exchanger 27 through which the refrigerant in the bypass circuit 18 passes, and the combustion chamber 2.
8, a burner 29 and a combustion fan 30 for heating the refrigerant in the heating heat exchanger 27 by the combustion of the burner 29 during the heating operation, and sending a high-temperature refrigerant to the indoor unit 1. The burner 29 includes a burner main body 29a made of aluminum die-cast, a burner head 29b for blowing out a flame made of stainless steel, and the like, and a temperature of about 250 to 300 ° C. is maintained by the burner main body 29a during combustion. Things.

A pump 31 pumps kerosene stored in a kerosene tank (not shown) provided separately from the air conditioner.
This is a leveler tank that is pumped up and temporarily stored in the refrigerant heating device 16. The leveler tank includes a float switch 33 for keeping the oil level of kerosene constant and an electromagnetic pump 34 that supplies the kerosene in the leveler tank 31 to the burner 29. 35
Is used for heating the burner 29 at the time of ignition with a heater provided in the burner 29 to vaporize the fuel kerosene,
It is used for controlling the temperature of the burner 29 during normal combustion. Reference numeral 36 denotes a temperature sensor for detecting the temperature of the burner 29, which detects the temperature of the surface of the burner main body 29a by a thermistor sensor or the like and issues a signal in accordance with the detected temperature. An electrode 37 generates a spark from the tip and ignites the burner 29. Reference numeral 38 denotes a frame rod for monitoring the combustion state of the burner 29.

The outdoor unit 9 includes an inverter device (not shown) for controlling the rotation of the compressor 12 and the like.
An outdoor control device that performs overall control. The outdoor control device is connected to the indoor control device 8 of the indoor unit 1 by a communication wire 11, exchanges signals with the indoor control device 8, and controls the indoor control device 8 through the communication wire 11. To the outdoor control device 39. Reference numeral 40 denotes an indoor temperature sensor which is provided at a suction port (not shown) of the indoor unit 1 and measures the temperature of the drawn indoor air. An indoor heat exchange sensor 41 measures the temperature of the indoor heat exchanger 2.

Reference numeral 42 denotes a discharge temperature sensor attached to the refrigerant pipe between the four-way valve 13 and the indoor heat exchanger 2 in the outdoor unit 9 to measure the temperature of the refrigerant. 43 is a heating temperature sensor provided in the refrigerant pipe of the bypass circuit 18 downstream of the refrigerant heating device 16.

Reference numeral 44 denotes a suction port of the outdoor unit 9 (not shown).
The outside air temperature sensor provided at the is used to measure the outdoor temperature. Reference numeral 45 denotes a propeller type outdoor fan which is rotated by an outdoor motor 46 and blows air to the outdoor heat exchanger 14. Reference numeral 47 denotes a seismic device which detects vibrations such as earthquakes and sends a signal to the outdoor control device 39 when a certain level of vibration is generated.

Reference numeral 48 denotes a safety device for the compressor 12, which prevents the internal winding from being broken due to the compressor 12 becoming hot due to an overload or an overcurrent flowing.
Reference numeral 49 denotes a safety thermostat attached to the outer wall of the combustion chamber 28, which is a bimetal switch and turns off at about 120 ° C. and automatically returns (ON) at about 100 ° C.

Numeral 50 denotes a delay operation means provided in the indoor control device 8 for preventing the refrigeration circuit and the refrigerant from being overheated by the residual heat when the heating operation is stopped. The apparatus 12 and the combustion fan 30 are continuously operated for about 3 minutes. Reference numeral 51 denotes a compressor operation determination unit provided in the indoor control device 8, which determines whether the compressor 12 is operating when a restart operation is performed during the delay operation. . 52 is a power cord for supplying power to the indoor control device 8.

The operation when the heating operation is stopped will be described with reference to FIGS. 4 to 6. If the operation switch 22 of the remote controller 6 is pressed during the heating operation, the burner 29 of the refrigerant heating device 16 is extinguished and the compressor 12 is turned off. High rotation speed (about 60H
In operation z), the temperature of the cooling fan 16 is reduced to a low speed (approximately 24 Hz). At this time, the combustion fan 30 continues to operate for cooling the refrigerant heating device 16 until the temperature of the refrigerant heating device 16 is sufficiently lowered. After continuing the delay operation for 3 minutes, the compressor 12,
The combustion fan 30 stops and the operation ends.

If the operation of the remote controller 6 is erroneously pressed during the heating operation and the operation switch 22 is pressed to perform the operation stop operation, if the operation switch 22 is pressed again to perform the operation operation, the above-described operation is performed once. Although the operation is delayed, the compressor operation determination unit 51 determines that the compressor 12 is in the low rotation operation state within about 3 minutes after the operation stop operation.
Immediately returns to high rotation without stopping and burner 29
Is re-ignited and the heating operation can be resumed quickly.

If the compressor operation determining unit 51 determines that the compressor 12 is in a stopped state after about three minutes have elapsed since the operation stop operation, the compressor restart operation is started after the elapse of the compressor restart prohibition time. Is what you do.

As described above, the start-up of the heating operation can be smoothly performed, and even if the remote controller 6 is operated incorrectly, the room temperature does not drop and the user does not feel uncomfortable.

[0021]

As described above, according to the present invention, it is possible to smoothly start up the operation when the heating operation is restarted.
Even if the remote controller 6 is operated incorrectly, the room temperature does not drop and the user does not feel uncomfortable.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a refrigeration circuit according to one embodiment of the present invention.

FIG. 2 is an explanatory diagram of the refrigerant heating device.

FIG. 3 is a system diagram of the control device.

FIG. 4 is a sequence diagram at the time of re-operation of the heating, in the case of re-operation during compressor operation.

FIG. 5 is a sequence diagram at the time of restarting the heating, in the case of restarting after stopping the compressor.

FIG. 6 is a flowchart of the same.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 indoor unit 8 indoor control device 9 outdoor unit 16 refrigerant heating device 29 burner 30 combustion fan 36 temperature sensor 39 outdoor control device

Claims (1)

[Claims] 1. An outdoor unit having a compressor, a four-way valve, an outdoor heat exchanger, an outdoor control device, etc., capable of varying the number of revolutions in multiple stages, and an indoor unit having an indoor heat exchanger, a fan, an indoor control device, etc. In the control device of the air conditioner provided in the outdoor unit, a refrigerant heating device for heating a part of the refrigeration cycle is formed by connecting the unit with a refrigerant pipe and a communication wire, and when the heating operation is stopped. The compressor is operated at a low speed for a predetermined time, and a predetermined time after the compressor is stopped is provided with a delay operation unit that does not perform re-operation and a compressor operation determination unit that determines whether the compressor is operating. If there is a re-operation command from the indoor control device, the compressor operation determination unit determines whether the compressor is currently operating, and if the compressor is operating, the compressor operates at a high rotational speed. And restarts the operation of the refrigerant heater, and the compressor is stopped. An air conditioner having a heating re-operation function for continuing the delayed operation, if any.