JPH0395361A - Heating and cooling apparatus - Google Patents

Abstract

PURPOSE:To perform a stable heating operation by a method wherein the refrigerant recovery operation period of time in the start-up of heating operation is shortened when the temperature of a compressor is high, and extended when it is low, so as to surely recover the refrigerant and to quickly and surely recover the refrigerating machine oil that is taken out by a large amount when the temperature of the compressor is low. CONSTITUTION:The set temperature at a comparator 43 is set at a temperature a little lower than the set control temperature of a compressor heater 2. The refrigerant recovery operation time period t1 corresponding to the set temperature Ts is assigned to a first timer 40 as a set temperature, and the time period t2 corresponding to the temperature T1 near the lowest outside temperature during heating operation is assigned to a second timer 41 as a set temperature, so that the refrigerant is satisfactorily recovered. When the temperature of the compressor is low, a combustion burner 11 is operated at a low combustion rate for a specified time period after refrigerant recovery operation, so that temperature rise in a refrigerant heater 10 is controlled low, and a continuous operation becomes feasible. A second solenoid valve 24 as an oil recovery device is put in action after the refrigerating machine oil, that is taken out to a heating circuit side during this heating operation, is condensed in the heater 11, so that oil recovery is surely performed, allowing the succeeding heating operation to be stable.

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.

Conventional technology 1 This type of heating/cooling device has been proposed for example in Japanese Patent Application Laid-open No. 57-101.
As shown in Publication No. 263, it has a side effect as shown in Fig. 4.

That is, a compressor 1 equipped with a compressor heater 2, a four-way valve 3, an outdoor heat exchanger 4, an outdoor heat exchanger fan 5, a first electromagnetic valve 6, a capillary tube 7, an indoor heat exchanger 8,
Indoor heat exchanger fan 9, second solenoid valve 10, check valve l1
, accumulator l2, third solenoid valve l3, refrigerant bomb 1
4. In the configuration of the refrigerant heater 15 and the burner 16, a cooling cycle is configured by operating the compressor 1 with the outdoor heat exchanger 4 as the condenser and the indoor heat exchanger 8 as the evaporator,
In the heating operation, the refrigerant heater 15 is heated with the burner 16 to function as an evaporator, the indoor heat exchanger 8 is also used as a condenser, and the refrigerant bomb is used as a refrigerant transport means to configure a heating cycle.
In order to prevent refrigerant from accumulating in the compressor 1 and to shorten bomb-down operation, the compressor 1 is heated by a compressor heater 2 to maintain a constant temperature.

With the above configuration, when heating operation starts, the eleventh magnetic 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. The fJI command is to stop the compressor 1 at the same time as the refrigerant pump 4, the refrigerant heater 15, and the indoor heat exchanger fan 9 start operating after the compressor 1 performs bomb-down operation with the compressor 1 stopped.

However, in the above-mentioned case, at the start of heating operation,
It is assumed that the compressor has been sufficiently heated by the compressor heater. In situations where there is a lot of refrigerant leakage, the refrigerant cannot be sufficiently recovered to the heating circuit within the set pump-down time, and the temperature of the refrigerant heater may rise abnormally during heating operation. However, there was a problem in that the heating operation could not be performed normally due to the generation of heat.

The present invention solves the conventional problem II, and aims to enable stable heating operation by sufficiently recovering refrigerant to the heating circuit side 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 includes a refrigerant conveying means other than the compressor, a refrigerant heater with a variable amount of heat, and an indoor heat exchanger during heating. +1 for the refrigerant circuit!
temperature detection means for detecting the temperature of the pressure I1 machine, refrigerant recovery means for recovering refrigerant from the outdoor heat exchanger to the indoor heat exchanger by driving a compressor, and refrigerant machine oil in the refrigerant heater. It has an oil recovery means for recovering, and a control device for controlling the drive of the refrigerant recovery means and the oil recovery means and the amount of heat of the refrigerant heater, and the control device compares the temperature detected by the temperature detection means with a predetermined temperature. a comparison section, a first timer, and a first
a second timer having a longer set time than the timer; a switching unit that switches to the first timer when the temperature is higher than a predetermined temperature and to the second timer when the temperature is lower than the predetermined temperature according to the comparison result of the comparison unit; A refrigerant recovery control section that drives the refrigerant recovery means until a timer reaches a set time; a high heat amount control section that drives the refrigerant heater with a high amount of heat when a first timer reaches a set time; and a second timer that drives a refrigerant recovery means for a set time. The third part starts operating when
a timer, a low heat amount control unit that drives the refrigerant heater with a low heat amount for a period of time during which a third timer is operating, a fourth timer that starts operating when the third timer reaches a set time; The apparatus further includes an oil recovery control section that drives the oil recovery means during the time that the timer is operating.

Effect of the present invention With the above-described structure, the refrigerant recovery operation time at the start of heating operation is shortened when the compressor temperature is high and lengthened when the compressor temperature is low, thereby reliably recovering the refrigerant necessary for heating operation and reducing the compression time. Stable heating operation is possible by quickly and reliably recovering refrigerant machine oil, which is taken out in large quantities when the machine temperature is low.

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 heater for heating the compressor provided at the bottom of the compressor ia1, 3 is a first check valve provided in the discharge pipe of the compressor 1, 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 is an outdoor heat exchanger blower, 9 is an accumulator, lO
1 is a refrigerant heater, 1l is a variable combustion amount combustion burner for heating the refrigerant jJa heater 10, 12 is a gas-liquid separator,
13 is a liquid receiver, and 14 is a first solenoid valve, which is a gas-liquid separator 1.
A second check valve 16 is located in the pipe 17 connecting the lower part of the liquid receiver 13 and the lower part of the gas-liquid separator 12. . l8 is a third check valve that connects the indoor heat exchanger 7 and the liquid receiver 13.
It is located in the pipe 19 that connects the upper part of the. 20 is a fourth check valve that connects the upper part of the gas-liquid separator 12 and the first check valve 3.
and a pipe 21 that connects the four-way valve 4. 23 is a first cavity tube, 24 is a second solenoid valve, and this first cavity tube 23 and second
The solenoid valve 24 is placed in series in a pipe 24 connecting the outdoor heat exchanger 5 and the lower part of the refrigerant heater IO.

26 is a third solenoid valve; 27 is a second cabillary tube; this third solenoid valve 26 and the second cabillary tube 2;
7 is placed in series in a pipe 29 that connects the pipe 19 with a pipe 28 that connects the lower part of the gas-liquid separator 12 and the lower part of the refrigerant heater. The upper part of the medium heater 10 and the upper part of the gas-liquid separator 12 are connected by a pipe 30. The first solenoid valve 14 and the second solenoid valve 24 are connected by a pipe 31.

In the above-mentioned refrigerant circuit horizontal command, the 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 second solenoid valve 24 and the third solenoid valve 26. Cabillary tube 23 and second cabillary tube 2
7 is used as a throttling device, and the indoor heat exchanger 7 is used to control the refrigerant circuit which acts as a moss generator. For heating operation, the four-way valve 4 is switched in the opposite direction to that for cooling operation, and the refrigerant heater 10 is heated by the combustion heater 11, which has a variable combustion zone.
The refrigerant in O is heated, and the refrigerant in a gas phase that reaches a high temperature in the gas-liquid separator 12 is pushed out to the indoor heat exchanger 7 through the piping 22, the check valve 20, and the four-way valve 4, where it undergoes indoor heat exchange. The liquefied refrigerant branch that heats the room by radiating heat in the container 7 passes through the pipe 19 and the check valve 18 and moves into the liquid receiver 13. Receipt
The refrigerant liquid accumulated in & B 13 is released by opening the first electromagnetic valve l4, and by guiding the pressure of the gas-liquid separator 12, the second check is caused by the head difference between the liquid receiver 13 and the gas-liquid separator 12. It is returned to the gas-liquid separator l2 via the valve 16.

As described above, the opening/closing operations of the liquid receiver l3 and the first solenoid valve 14, and the check action of the third check valve 18 make it possible to release the refrigerant, which is a heat transfer medium, without operating the compressor 1. . That is, the liquid receiver 13, the first electromagnetic valve 14, and the third check valve 18 serve as the refrigerant conveying means 32.

Before performing the above 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. With the four-way valve 4 in the same direction as during heating operation, and with the outdoor heat exchanger 5 communicating with the accumulator 9, the compressor 1 is operated to transfer the refrigerant from the outdoor heat exchanger 5, accumulator 9, and compressor 1 into the room. It is recovered to the heat exchanger 7. At this time, the indoor heat exchanger blower 8 is operated to sufficiently divide the refrigerant in the indoor heat exchanger 7 to facilitate returning the liquid refrigerant from the pipe 19 to the liquid receiver 13. That is, compressor 1,
The first check valve 3 and the four-way valve 4 form a refrigerant recovery means 33.

When the refrigerating machine oil taken out to the heating circuit side during heating operation condenses into the refrigerant heater IO, the flow of refrigerant in the refrigerant heating 10 deteriorates, causing abnormal heating due to poor heat exchange. Due to the danger, it is necessary to collect the ura as early as possible. When the second electric valve 24 is opened, the refrigerating machine 401 which has been placed in the lower part of the force I1 force generator 10 flows out to the outdoor room 2 and the exchanger 5. This outflow can be recovered to the compressor 1 by operating the pressure generator 1. That is, the second electric valve 24 is the oil recovery means. 34 is compression 1
Temperature detection means 35 detects the temperature of ffll, 35 is the refrigerant recovery stage 33, oil recovery means (second ?Jil valve) 24
36 is a recovery control unit that drives the recovery means, 37 is a strong combustion control unit for the combustion burner 1l, 3B is a weak combustion control unit for the combustion burner 11, 39 40 is a first timer; 4l is a second timer with a longer setting than the first timer; 42 is the first timer 40 and the second timer. 41 is a switching section that switches the temperature, and 43 is a comparison section that compares the temperature detected by the temperature detection stage 34 with a predetermined temperature;! ! When the detected temperature is higher than a predetermined temperature, the switching unit 42 is switched to operate the first timer with a shorter set time, and when the detected temperature is lower than the predetermined temperature, the second timer with a longer set time is operated. The switching unit 42 is switched as shown in FIG. When the set time on the timer has elapsed, the recovery stage 33 is stopped, and when the set time on the first timer 37 has elapsed, the strong combustion control section 37 is activated to drive the combustion burner 1l with strong combustion.

When the set time of the second timer 41 has elapsed, the third timer 4
4 is started, and the weak combustion control section 38 is operated to drive the combustion burner 1l with weak combustion until the third timer 44 elapses the set time. When the set time of the third timer 44 has elapsed, the fourth timer 45 is started, and the fourth timer 45 is started.
5, the oil recovery control section 39 is operated to drive the oil recovery means until the set time of the fourth timer 45 has elapsed, and the first timer 40 is started when the set time of the fourth timer 45 has elapsed. compressor l
As shown in Figure 2, the refrigerant recovery time depends on the temperature of
Since it is short when the temperature is high and long when the temperature is low, the predetermined temperature of the comparison section 43 is set slightly lower than the control set temperature of the compressor heating heater 2, and the time required when the set temperature Ts is reached. Compression Sufficient refrigerant recovery is performed regardless of the temperature of the machine 1, and heating operation is possible. Further, when the temperature of the compressor 1 is sufficiently high, a short refrigerant recovery operation is required, so power consumption during refrigerant recovery can be reduced. When the temperature of the compressor 1 is low, as shown in Fig. 3, the refrigerant machine oil is taken out with a lot of mold, but since the combustion burner 11 is operated with weak combustion for a certain period of time after the refrigerant recovery operation, the refrigerant J
The temperature rise in the JII heater IO is suppressed to a low level, making continuous operation possible. During this heating operation, the refrigerating machine oil taken out to the heating circuit side is condensed into the heater 1L, and then the second oil recovery means is used. By driving the solenoid valve 24, oil can be recovered reliably and the next heating operation can be made stable.

FIG. 4 shows a flowchart 1 when the above processing flow is realized by a microcomputer. In FIG. 4, the numbers of functional parts are written next to them.

Effects of the Invention As described above, the heating/cooling machine of the present invention provides the following effects.

(1) The refrigerant recovery operation time at the start of heating operation is determined by detecting the temperature of the compressor, and when the temperature is higher than a predetermined temperature, the first timer is used to shorten the time, and when the temperature is low, the second timer is used to shorten the time. By increasing the length of time, the refrigerant required for the heating circuit can be reliably recovered and stable heating operation can be achieved. It can be reduced.

(3) A large amount of refrigerating machine oil is taken out during refrigerant recovery operation when the compressor temperature is low, but by performing heating operation with weak combustion for a certain period of time and ensuring early oil recovery, heating operation can be started quickly. This has the effect of making stabilization possible.

[Brief explanation of drawings]

FIG. 1 is a system diagram of a control device for a heating/cooling machine according to an embodiment of the present invention, and FIG. Figure 3 is a characteristic diagram of compressor temperature and refrigerant recovery time, Figure 4 is a flowchart showing the flow of microcomputer processing, and Figure 5 explains a conventional example. This is a diagram of the composition. ■・・・Compressor, 5・・・Outdoor heat exchanger, 7
... Indoor heat exchanger, IO ... Refrigerant heater,
l1...L hana with variable combustion, 23...
- First cabillary tube, 27... Second cabillary tube, 32... Refrigerant transport means, 33
... Refrigerant recovery means, 34 ... Temperature detection means, 35 ... Control device, 36 ... Refrigerant recovery control section, 37 - Strong combustion control section, 3 Day: Weak combustion control section, 39... Oil recovery control section, 40...
...First timer, 41...Second timer, 42...Switching section, 43...Comparison section,
44...Third timer, 45...Fourth timer
timer.

Claims (1)

[Claims] During cooling, the refrigerant circuit is composed of a compressor, an indoor heat exchanger, an outdoor heat exchanger, and a throttling device, and during heating, a refrigerant circuit is constructed using a refrigerant transport means other than the compressor, a refrigerant heater with a variable amount of heat, and an indoor heat exchanger. Temperature detection means that constitutes a circuit and detects the temperature of the compressor, refrigerant recovery means that recovers refrigerant from the outdoor heat exchanger to the indoor heat exchanger by driving the compressor, and refrigerant machine oil in the refrigerant heater. and a control device for controlling the drive of the refrigerant recovery means and oil recovery means and the amount of heat of the refrigerant heater, and the control device compares the temperature detected by the temperature detection means with a predetermined temperature. a first timer, a second timer having a set time longer than the first timer, and a first timer when the temperature is higher than a predetermined temperature and a second timer when the temperature is lower than the predetermined temperature according to the comparison result of the comparison unit. a refrigerant recovery control unit that drives the refrigerant recovery means until the first and second timers reach a set time; a high heat amount control unit that is driven, a third timer that starts operating when a second timer reaches a set time, and a low heat amount control unit that drives the refrigerant heater with a low heat amount for the time that the third timer is operating. and a fourth timer that starts operating when the third timer reaches a set time; and an oil recovery control section that drives the oil recovery means during the period during which the fourth timer is operating.