JPH03221762A - Air conditioner - Google Patents

Abstract

PURPOSE:To carry out stable air warming operation by providing a turn switch on an outdoor control base plate for switching control sequence of refrigerant purging means according to whether a room unit is positioned higher or lower than an outdoor unit. CONSTITUTION:A switch 44 is provided on an outdoor control base plate 45. In installation of an air conditioner, if a room unit 34 is positioned higher than an outdoor unit 35, a room thermostat is ON to switch immediately to control sequence side for driving a refrigerant heating means 11. On the other hand, if the room unit 34 is positioned lower than the outdoor unit 35, the thermostat is ON to switch to control sequence side for driving a refrigerant heating means 11 after driving a refrigerant collecting means 33 and a refrigerant purging means 24. In this constitution, as the refrigerant purging operation is conducted at the start of air warming operation, introduction of liquid refrigerant into a refrigerant heater 10 is very firm, and when the room unit 34 is positioned higher than the outdoor unit 35, the refrigerant purging operation can be minimized, whereby the duration of the device can be lengthened.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a control device for a heating/cooling machine that uses a compressor for cooling and uses a refrigerant conveying means other than the compressor and a refrigerant heater for heating. be.

2. Description of the Related Art Conventionally, this type of heating/cooling device has been disclosed, for example, in Japanese Patent Application Laid-open No. 57-1012.
As shown in Japanese Patent No. 63, it has a configuration as shown in FIG.

In other words, pressure! Compressor 1 equipped with 1111Ia heater 2, four-way valve 3, outdoor heat exchanger IA device 4, outdoor heat exchanger fan 5, first solenoid valve 6, capillary tube 7, indoor heat exchanger fan 9, second solenoid Valve lO1 check valve 11 accumulator 12, third solenoid valve 13, refrigerant pump 14,
In the configuration of the refrigerant heater 15 and burner 16, the outdoor heat exchanger 4 is used as a condenser, the indoor heat exchanger 8 is used as a generator, and the cooling cycle is controlled by the operation of the pressure E@ machine 1. In the heating operation, the cooling heater 15 is heated with the burner 16 to serve as an evaporator, and the indoor heat exchanger 8 is used as a condenser.
A heating cycle is configured as a refrigerant pump conveyance means, and a compressor heater 2 heats the compressor 1 to maintain a constant temperature in order to prevent refrigerant from accumulating in the compressor 1 and shorten pump down operation. .

With the above configuration, at the start of heating operation, the first solenoid valve 6 is closed, the four-way valve 3 is switched so that the refrigerant gas discharged from the compressor 1 flows to the indoor heat exchanger 8, and the indoor heat exchanger fan 9 is switched. After pump-down operation with pressure jIIIl is performed with the refrigerant pump 14 stopped, the refrigerant is heated! s15
The compressor 1 is also stopped when the indoor heat exchanger fan 90 starts operating.

Invention tries to solve! However, in the horizontal mode as described above, it is assumed that there is sufficient refrigerant liquid in the refrigerant heater 15 and refrigerant pump 14 at the start of heating operation.
When abnormal heating occurs in a part and the temperature reaches an abnormally high temperature, the refrigerant evaporates and no longer exists in liquid form. Especially indoor heat exchange 2
38 is installed at a lower position than the refrigerant heater 15 and refrigerant pump 14, most of the liquid refrigerant in the cycle is present on the indoor heat exchanger 8 side, and the refrigerant in the outdoor heat exchanger 4 is transferred to the compressor. Even if the pump is pumped down with l, it will simply move towards the indoor heat exchanger 8 and there will be no liquid in the refrigerant heater 15, and in this state, even if the refrigerant heater 115 is heated, it will immediately become overheated. , 1IlrAi! ! He had the problem of not being able to roll.

The present invention solves such conventional problems, and aims to enable stable heating operation by reliably securing liquid refrigerant to the refrigerant power I heater at the start of heating operation.

Means for Solving the Problems In order to solve the above problems, the heating/cooling device control device of the present invention uses a refrigerant conveying means other than a compressor, a refrigerant heater having a heating means, and an indoor heat exchanger during heating. The refrigerant circuit is configured horizontally or with separate indoor and outdoor units, and the control sequence of the refrigerant purge means is determined depending on whether the indoor unit is located higher or lower than the outdoor unit. A changeover switch for changing the temperature is provided on the outdoor unit control board.

Effect of the present invention With the above-described configuration, the liquid refrigerant of the refrigerant heater can be reliably introduced by performing the refrigerant purge operation at the start of heating, and when the indoor unit is higher than the outdoor unit, the refrigerant purge operation can be performed. It is possible to improve the durability of the device by keeping the amount to a minimum.

EXAMPLE Hereinafter, an example of the present invention will be described based on the accompanying drawings.

FIG. 1 shows a system block diagram of the present invention.

In Fig. 1, 1 is a compressor, 2 is a compressor heater provided at the bottom of the compressor 1, 3 is a first check valve provided in the discharge pipe of the compressor 1, and 4 is a four-way valve. , 5 is an outdoor heat exchanger, 6 is an outdoor heat exchanger blower, 7 is an indoor heat exchanger, 8
1 is a blower for an indoor heat exchanger, 9 is an accumulator, 10 is a refrigerant heater, 11 is a heating means such as a combustion burner for heating the refrigerant heater 10, 12 is a gas-liquid separator, 13 is a liquid receiver, and 14 is a third 1 of 1 is a magnetic valve located in the pipe 15 connecting the upper part of the gas-liquid separator 12 and the upper part of the liquid receiver 13, and 16 is a second check valve that connects the lower part of the liquid receiver 13 and the gas-liquid separator]2 located in the pipe 17 connecting the lower part of the
Reference numeral 18 indicates a third check valve, which is located in the piping connecting the indoor heat exchanger m7 and the upper part of the liquid receiver I3.20 indicates a fourth check valve, which connects the upper part of the gas-liquid separator 12 and the 2 is located in the pipe 22 connecting the check valve 3 of No. 1 and the pipe 21 connecting the four-way valve 4, 23 is the first capillary tube, and 24 is the second capillary tube.
This solenoid valve connects this first capillary tube 23 and the second capillary tube 23.
The solenoid valve 24 is located in series in the pipe 24 connecting the outdoor maturing heat exchanger 5 and the refrigerant heater lO, 26 is a third solenoid valve, 27 is a second capillary tube, and this third t
The m-valve 26 and the second capillary tube 27 are placed in series in a pipe 29 that connects the lower part of the gas-liquid separator 12 to the pipe 28 and pipe 19 that connect the lower part of the refrigerant heater. The upper part of the refrigerant heater 10 and the upper part of the gas-liquid separator 12 are connected to the piping 3.
Connected by 0. First solenoid valve 14 and second tuft valve 14
The second T4Ta valve 24 is connected to the valve 121. Further, the indoor unit 34 and the outdoor unit 35 are configured separately.

In the above refrigerant circuit configuration, cooling operation is performed by switching the four-way valve 4 so that the discharge gas of the compressor 1 flows to the outdoor heat exchanger 5, and opening the 2'N, magnetic valve 24, and the third solenoid valve 26. First capillary tube 23 and second capillary tube 2
7 constitutes a refrigerant circuit in which the indoor heat exchanger 7 acts as an evaporator, with 7 used as a throttle device. 9 During heating operation, the four-way valve 4 is switched in the opposite direction to that during cooling operation, and the refrigerant is removed by heating means 11 such as a combustion burner. By heating the heater 10, the refrigerant heater 10
The refrigerant inside is heated, and the refrigerant in a gas phase that reaches a high temperature in the gas-liquid separator 12 is transferred to the piping 22, the check valve 20, and the four-way valve 4.
The refrigerant liquid is pushed out to the indoor heat exchanger 7 through the indoor heat exchanger 7, heats the room by dissipating the heat, and the liquefied refrigerant liquid is passed through the pipe 19.
, and moves into the liquid receiver 13 via the check valve 18. Receiver 1
The refrigerant liquid accumulated in the liquid receiver I3 is transferred to the liquid receiver I3 by opening the first magnetic valve 14 and guiding the pressure of the gas-liquid separator 12.
The air is returned to the gas-liquid separator 12 via the second check valve 16 due to the head of the gas-liquid separator 12 . As described above, the opening and closing operations of the liquid receiver 13 and the first solenoid valve 14 and the third check valve 18 are explained.
The refrigerant, which is a heat transfer medium, can be heated without operating the compressor 1 due to the check action of .

Before performing the heating operation, a recovery operation is performed in which the refrigerant in the outdoor heat exchanger 5, accumulator 9, and compressor 1, which are not part of the heating circuit, is recovered to the heating circuit side. Four directions'jr・1
is in the same direction as during heating operation, and with the outdoor heat exchanger 5 communicating with the accumulator 9, the compressor 41 is operated to exchange indoor heat with the refrigerant in the outdoor heat exchanger 5, accumulator 9, and compressor 1. At this time, the indoor heat exchanger blower 3 is operated to sufficiently liquefy the refrigerant in the indoor heat exchanger 7 and facilitate the return of the liquid refrigerant from the pipe 19 to the receiver 13.

In other words, pressure & I? dll, the first check valve 3, and the four-way valve 4 form a refrigerant recovery means 33. When the refrigerant recovery means 33 is operating, the pressure of the outdoor heat exchanger 5 is low, and the indoor heat exchanger 7, liquid receiver 13, separator 12, and refrigerant heater 10 on the heating circuit side are almost at a low pressure. When the second electromagnetic valve 24 is opened, the pressure inside the refrigerant heater 10, where the refrigerant in the single-medium heater 10 is purged to the outdoor heat exchanger 5, becomes the pressure of the indoor heat exchanger 7. By lowering the temperature further, the liquid refrigerant in the indoor heat exchanger 7 is transferred to the third check valve 18 and the liquid receiver 13.
, the refrigerant heater) through the second check valve 16. ■p, the second electromagnetic #24 is a refrigerant purge means; 336 is an indoor temperature detection means for detecting the indoor temperature;
7 is a refrigerant recovery means 33, a refrigerant purge means 24 (second
control sequence unit for controlling the drive of the ring 6R valve), 38
By detecting the indoor temperature, the room heater for heating operation also turns 0N-
The room server that controls OFF is also a control unit, 39 is a recovery control unit that drives the refrigerant recovery means, and 40 is the refrigerant purge means 24
41 is a first timer; 4
2 is a second timer, 43 is a heating control unit that drives the heating means 11, and 44 is a changeover switch, which is installed on the outdoor unit control P board 45, so that when the main heating/cooling unit is installed, the indoor unit 34 is turned on. When the indoor unit 34 is installed at a higher position than the outdoor unit 35, the room server is also turned on and immediately switches to the control sequence side that drives the refrigerant heating means 11, and when the indoor unit 34 is installed at a lower position than the outdoor unit 35, the room server is also turned on. Then, after driving the refrigerant recovery means 33 and the refrigerant purge means 24, the control sequence is switched to the side in which the refrigerant heating means 11 is driven. The changeover switch 44 is the indoor unit 34 or the outdoor unit 3.
It is installed on the control P board of No. 5, and the contact direction is set at the time of installation work. With the above control configuration, the indoor unit 3
4 is outside! If the room temperature is higher than 1!35, the room server is also OF 12. Since the refrigerant power n heat exists in LflO located at a lower position, the room server also starts heating the refrigerant immediately with No. If the indoor unit 34 is located at a lower position than the outdoor unit 35, and the heating operation is stopped due to the room heater being turned off, the heating operation is started using the liquid refrigerant in the separator 12 immediately after the room temperature is turned off. Although liquid refrigerant is secured in IO, the liquid refrigerant is evaporated by the residual heat of refrigerant heater IO, and the refrigerant liquid is concentrated in the indoor heat exchanger 7 located at a lower position, and the liquid refrigerant 2313, separator 12, The liquid refrigerant in the refrigerant heater IO becomes very low, and the liquid in the pipe 19 moves to the indoor heat exchanger 7 side due to the white light of the refrigerant, leaving only the gas refrigerant □
ζru.

If the refrigerant heater 10 is heated by the refrigerant heating means 1 in such a state, the small amount of liquid refrigerant in the refrigerant heater 10 will quickly evaporate, resulting in a dry firing state, and the refrigerant heater 10 will be in an abnormal heating state. Therefore, when both the room server and the room server receive an ON signal from the control unit 38 due to temperature detection by the indoor temperature detection means 36, the refrigerant recovery operation and the refrigerant purge operation are performed to reduce the pressure in the refrigerant heater lO. decreases, and the liquid refrigerant in the indoor heat exchanger 7 flows through the pipe 19 and liquid receiver 1.
3. The refrigerant recovery operation for recovering the refrigerant, which is supplied to the indoor heat exchanger 7 through the separator 12 and purged to the outdoor heat exchanger 5 after completion of refrigerant purging, is waited for a predetermined time. Then, the refrigerant heating means 11 is operated to heat the refrigerant in the refrigerant heater 10 and the heating operation is resumed. From now on
Most importantly, since refrigerant heating is started after reliably securing the refrigerant liquid in the refrigerant heater 10, stable heating operation can be obtained without causing an abnormal rise in the temperature of the refrigerant heater 10.

FIG. 2 shows a flowchart when the above processing flow is executed by a microcomputer. According to the heating/cooling machine of the present invention, the following effects can be obtained as described above: 9. Effects of the Invention In 2nd I21, numbers of functional parts are written next to each other.

(1) By providing a refrigerant recovery means, a refrigerant purge means, and a changeover switch that switches to a control sequence that starts refrigerant heating after performing refrigerant recovery and refrigerant purging when the indoor unit is lower than the outdoor unit when the room sensor is turned on. Since liquid refrigerant can be secured in each refrigerant heater at the start of heating operation, stable heating operation can be started without causing an abnormal rise in the refrigerant heater.

(2) Liquid refrigerant is definitely present in the refrigerant heater even when the room temperature sensor is turned on.If the indoor unit is located higher than the outdoor unit, the above switch allows you to operate refrigerant recovery operation or refrigerant purge operation. Since this is not necessary, the number of operations of the compressor and the second solenoid valve U can be greatly reduced, which leads to improved durability of the compressor and the second solenoid valve U, and also has the effect of reducing power consumption. be.

(3) By providing the above changeover switch on the outdoor unit P plate, the switch can be securely fixed and easy to operate during installation work.

[Brief explanation of drawings]

FIG. 1 is a system diagram of a control device for a heating/cooling device according to an embodiment of the present invention, FIG. 2 is a flowchart showing the flow of processing by a microcomputer, and FIG. 3 is a system diagram illustrating a conventional example. 1...Compressor, 5...Outdoor heat exchanger,
7... Indoor heat exchanger, 10... Refrigerant heater, 23... First capillary tube, 24
... Refrigerant purging means, 27 ... Second cabinet 11 tube, 32 ... Refrigerant conveying means,
33...refrigerant recovery means, 34...indoor unit, 35...outdoor unit, 37...control sequence section, 44...changeover switch , 45...
...Outdoor unit board.

Claims (1)

[Claims] During cooling, the refrigerant circuit is composed of a compressor, an indoor heat exchanger, an outdoor heat exchanger, and a throttle device, and during heating, the refrigerant circuit is composed of a refrigerant conveying means other than the compressor, a refrigerant heater, and an indoor heat exchanger. The indoor unit and the outdoor unit are separated, and the refrigerant purge means purges the refrigerant of the refrigerant heater, and the control sequence of the refrigerant purge means is changed depending on whether the indoor unit is located higher or lower than the outdoor unit. A heating/cooling machine with a switch mounted on the outdoor unit control board.