JP2669069B2 - Heating and cooling machine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a warming / cooling machine that uses a compressor during cooling and uses a refrigerant conveying means and a refrigerant heater other than the compressor during heating. is there.

2. Description of the Related Art Conventionally, this kind of heating / cooling machine has a configuration as shown in FIG. 4 as disclosed in, for example, Japanese Patent Application Laid-Open No. 57-101263.

That is, a compressor equipped with a compressor heater 2, a four-way valve 3, an outdoor heat exchanger 4, an outdoor heat exchanger fan 5, a first solenoid valve 6, a capillary tube 7, an indoor heat exchanger 8, an indoor heat exchanger Fan 9, second solenoid valve 10, check valve 11, accumulator 12,
In the configuration of the third solenoid valve 13, the refrigerant pump 14, the refrigerant heater 15, and the burner 16, during the cooling operation, the first solenoid valve 6 and the second solenoid valve
10 is opened, the third solenoid valve 13 is closed, the four-way valve 3 is switched so that the discharge of the compressor 2 is connected to the outdoor heat exchanger 4, the outdoor heat exchanger 4 is used as a condenser, and the indoor heat exchange is performed. The refrigerant cycle is constituted by the operation of the compressor 1 using the evaporator 8 as the evaporator, and the heating operation is performed by closing the first electromagnetic valve 6 and the second electromagnetic valve 10.
The third solenoid valve 13 is opened, the four-way valve 3 is switched so that the discharge of the compressor 2 is connected to the indoor heat exchanger 8, and the refrigerant heat exchanger 15 is heated by the burner 16 to be an evaporator. A heating cycle is configured by using the heat exchanger 8 as a condenser and a refrigerant pump as a refrigerant transporting means. In order to prevent refrigerant from accumulating in the compressor 1 and to shorten the pump down operation, the compressor heating heater 2 is used to compress the compressor 1. To maintain a constant temperature.

With the above configuration, when the heating operation is started, the first solenoid valve 6 and the second solenoid valve 10 are opened, the third solenoid valve 13 is closed, and 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 further, after the indoor heat exchanger fan 9 is stopped, the compressor 1 is pumped down, and then the refrigerant pump 14 and the refrigerant heating are performed. The compressor 1 is stopped when the operation of the container 15 and the indoor heat exchanger fan 9 is started.

Problems to be Solved by the Invention However, in the above configuration, at the time of starting the heating operation, it is assumed that the compressor is sufficiently heated by the compressor heater, but, for example, immediately after installing the unit or The power is turned off for a long time and the compressor is cold,
Further, in a state where the refrigerant leaks into the outdoor heat exchanger frequently, the refrigerant cannot be sufficiently recovered to the heating circuit side within the set predetermined pump down time, and the temperature of the refrigerant heater during the heating operation is reduced. However, there is a problem that a normal heating operation cannot be performed due to a phenomenon such as an abnormal rise.

SUMMARY OF THE INVENTION The present invention has been made to solve the conventional problem, and has as its object to perform stable heating operation by sufficiently recovering the refrigerant to the heating circuit side at the start of the heating operation.

Means for Solving the Problems In order to solve the above problems, the controller of the heating / cooling machine of the present invention separates the compressor and the outdoor heat exchanger by a valve during heating, and refrigerant conveying means other than the compressor, A refrigerant circuit is constituted by a refrigerant heater and an indoor heat exchanger, and temperature detection means for detecting the temperature of the compressor, and the refrigerant in the outdoor heat exchanger are recovered in the indoor heat exchanger by driving the compressor. And a control device for controlling the driving of the recovery device, the control device comparing the temperature detected by the temperature detection device with a predetermined temperature, a first timer, and a first timer. A second timer having a longer set time than the timer; a second timer when the comparison result of the comparison unit is lower than a predetermined temperature; and a switching unit which switches to the first timer when the temperature is higher than the predetermined temperature, and the first and second Until the timer reaches the set time It is configured to have a recovery control unit for driving the.

Operation The present invention, by the above-described configuration, makes the refrigerant recovery operation time at the start of the heating operation shorter when the temperature of the compressor is high and longer when the temperature of the compressor is low, so that the refrigerant recovery required for the heating operation is reliably performed. Stable heating operation is possible.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 shows a system block diagram of the present invention. First
In the figure, 1 is a compressor, 2 is a heater for compressor heating provided at a lower part of the compressor 1, 3 is a first check valve provided in a discharge pipe of the compressor 1, 4 is a four-way valve, 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, 10 is a refrigerant heater, 11 is a combustion burner for heating the refrigerant heater 10,
12 is a gas-liquid separator, 13 is a liquid receiver, and 14 is a first solenoid valve, which is a pipe 15 that connects the upper part of the gas-liquid separator 12 and the upper part of the liquid receiver 13
Let's position it inside. A second check valve 16 is located in a pipe 17 connecting the lower part of the liquid receiver 13 and the lower part of the gas-liquid separator 12. Reference numeral 18 denotes a third check valve which is located in a pipe 19 connecting the indoor heat exchanger 7 and the upper part of the liquid receiver 13. A fourth check valve 20 is located in the pipe 22 connecting the upper part of the gas-liquid separator 12 and the pipe 21 connecting the four-way valve 4 of the first check valve 3. Reference numeral 23 is a first capillary tube, 24 is a second solenoid valve, and the first capillary tube 23 and the second solenoid valve 24 are connected in series in a pipe 25 connecting the outdoor heat exchanger 5 and the lower portion of the refrigerant heater 10. Position it. 26 is a third solenoid valve, 27 is a second capillary tube, and the third solenoid valve 26 and the second capillary tube 27 are a pipe 28 and a pipe 19 connecting the lower part of the gas-liquid separator 12 and the lower part of the refrigerant heater. It is located in series in the pipe 29 that connects the two. The upper part of the refrigerant heater 10 and the upper part of the gas-liquid separator 12 are connected by a pipe 30. Piping the first solenoid valve 14 and the second solenoid valve 24
Tied at 31.

In the above-described refrigerant circuit configuration, 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.
A refrigerant circuit in which the capillary tube 23 and the second capillary tube 27 are used as expansion devices and the indoor heat exchanger 7 functions as an evaporator. In the heating operation, the second solenoid valve 24 and the third solenoid valve 26 are closed, the four-way valve 4 is switched to the direction opposite to that in the cooling operation, and the combustion heater 11 heats the refrigerant heater 10 to heat the refrigerant heater 10. The refrigerant inside is heated and the gas-liquid separator 12
The refrigerant in the gaseous state, which has become hot, is pushed out to the indoor heat exchanger 7 through the pipe 22, the check valve 20, and the four-way valve 4, and radiates heat in the indoor heat exchanger 7 to heat the room and liquefy the refrigerant. Liquid is piping
Move to the receiver 13 via the check valve 18. The refrigerant liquid accumulated in the liquid receiver 13 is guided to the pressure of the gas-liquid separator 12 by opening the first solenoid valve 14, and the second reverse flow due to the drop between the liquid receiver 13 and the gas-liquid separator 12. Gas-liquid separator via stop valve 16
Returned to 12. As described above, the first solenoid valve of the receiver 13
By the opening / closing operation of 14 and the check action of the third check valve 18, the refrigerant as the heat transfer medium can be performed without operating the compressor 1. That is, the liquid receiver 13, the first solenoid valve 14, and the third check valve 18
Serves as the refrigerant transporting means 32.

Before performing the above heating operation, a recovery operation for recovering the refrigerant in the outdoor heat exchanger 5, the accumulator 9, and the compressor 1 which are not in the heating circuit to the heating circuit side is performed. In the heating operation, the compressor 1 is operated with the second electromagnetic valve 24 and the third electromagnetic valve 26 closed, the four-way valve 4 in the same direction as in the heating operation, and the outdoor heat exchanger 5 connected to the accumulator 9. The refrigerant of the outdoor heat exchanger 5, the accumulator 9 and the compressor 1 is recovered in the indoor heat exchanger 7. At this time, the indoor heat exchanger blower 8 is operated to sufficiently liquefy the refrigerant in the indoor heat exchanger 7, and the pipe 19 receives the liquid receiver 13
To facilitate the return of the liquid refrigerant. That is, the compressor 1, the first check valve 3, and the four-way valve 4 constitute the refrigerant recovery means 33. Further, each valve of the first check valve 3, the four-way valve 4, and the second solenoid valve 24 serves to isolate the compressor 1 and the outdoor heat exchanger 5 from the heating circuit. 34 is a temperature detecting means for detecting the temperature of the compressor 1, 35 is an electricity recovery means 33
Controller for controlling the driving of the combustion burner 11 and 36, a recovery control unit for driving the recovery means 33, 37 a combustion control unit for driving the combustion burner 11, 38 a first timer, 39 a first A second timer having a longer set time than the timer, 40 is a switching unit that switches between the first timer 38 and the second timer 39, and 41 is a comparison unit that compares the temperature detected by the temperature detection means 34 with a predetermined temperature. When the detected temperature is higher than the predetermined temperature, the switching unit 40 is switched as if the first timer having a short set time is operated,
When the detected temperature is lower than the predetermined temperature, the second time is long.
The switching unit 40 is switched every time the timer is activated, either one is started, and the recovery control unit 36 is operated to drive the recovery means 33 until the timer elapses a set time. When the timer has passed the set time, the recovery means 33 is stopped, the combustion control section 37 is operated, and the combustion burner 11 is driven. As shown in FIG. 2, depending on the temperature of the compressor 1, the recovery time of the refrigerant is short when the temperature is high and long when the temperature is low. Therefore, the predetermined temperature of the comparison section 41 is set to the control temperature of the heater 2 for heating the compressor. may be set slightly lower than the temperature, the refrigerant recovery duration t ₁ required at the time of the set temperature T _S and the set time of the first timer 38, the temperature T _L close to the minimum outside air temperature during the heating operation period The corresponding time t ₂ to the second timer
By setting the set time to 39, there is an effect that the refrigerant can be sufficiently recovered regardless of the temperature of the compressor 1 and a stable heating operation can be obtained. Further, when the temperature of the compressor 1 is sufficiently high, there is an effect that the recovery operation can be completed in a short time. FIG. 3 shows a flowchart in the case where the above processing flow is realized by a microcomputer. In FIG. 3, the numbers of parts having functions are shown on the side.

Effects of the Invention As described above, according to the heating / cooling device of the present invention, the following effects can be obtained.

(1) At the start of the heating operation, the refrigerant recovery operation time is detected by detecting the temperature of the compressor. When the temperature is higher than a predetermined temperature, the first timer shortens the time, and when the temperature is low, the second timer reduces the time. By lengthening the length, it is possible to reliably collect the refrigerant required for the heating circuit and to obtain stable heating operation.

(2) Especially, the recovery operation time may be short. When the temperature of the compressor is high, the recovery operation time is shortened so that the heating starts up quickly and the power consumption of the compressor during the recovery operation is reduced. There is.

[Brief description of the drawings]

FIG. 1 is a system block diagram of a controller for a heating / cooling machine according to an embodiment of the present invention, FIG. 2 is a characteristic diagram of compressor temperature and refrigerant recovery required time, and FIG. 3 is a processing flow of a microcomputer. A flow chart, FIG. 4 is a block diagram for explaining a conventional example. 1 ... Compressor, 3 ... First check valve, 4 ... Four-way valve, 5 ...
... outdoor heat exchanger, 7 ... indoor heat exchanger, 10 ... refrigerant heater, 23 ... first capillary tube, 24 ... second solenoid valve, 27 ... second capillary tube, 32 ... refrigerant transfer Means, 33 ... Recovery means, 34 ... Temperature detection means, 35 ... Control device, 36 ... Recovery control section, 38 ... First timer, 39 ...
2nd timer, 40 ...... Switching part, 41 ...... Comparison part.

Claims (1)

(57) [Claims] 1. During cooling, a refrigerant circuit is constituted by a compressor, an indoor heat exchanger, an outdoor heat exchanger, and a throttling device. During heating, the compressor and the outdoor heat exchanger are separated by a valve. Refrigerant transport means, a refrigerant heater, an indoor heat exchanger to form a refrigerant circuit, compressor temperature detection means for detecting the temperature of the compressor, by driving the compressor the refrigerant of the outdoor heat exchanger A first comparison unit that compares the temperature detected by the temperature detection unit with a predetermined temperature; and a recovery unit that recovers the indoor heat exchanger and a controller that controls the drive of the recovery unit. A timer, a second timer having a set time longer than that of the first timer, a switching unit for switching to a second timer when the comparison result of the comparison unit is lower than a predetermined temperature, and a first timer when the temperature is higher than the predetermined temperature; Until the first and second timers reach the specified time Heating and cooling apparatus having a recovery control unit which drives the recovery means.