JP2762605B2 - 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 type 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, the compressor 1 having the compressor heater 2,
Four-way valve 3, outdoor heat exchanger 4, fan 5 for outdoor heat exchanger,
First solenoid valve 6, Capillary tube 7, Indoor heat exchanger 8, Indoor heat exchanger fan 9, Second solenoid valve 10, Check valve 1
1. In the configuration of the accumulator 12, the third solenoid valve, the refrigerant pump 14, the refrigerant heater 15, and the burner 16, the cooling of the compressor 1 is performed by using the outdoor heat exchanger 4 as a condenser and the indoor heat exchanger 8 as an evaporator. A cooling cycle by operation is constituted, and a heating operation is an evaporator by heating the refrigerant heater 15 with the burner 16, the indoor heat exchanger 8 is also a condenser, and a refrigerant pump is constituted by a refrigerant conveying means to constitute a heating cycle, In order to prevent the refrigerant from remaining in the compressor 1 and shorten the pump-down operation, the compressor 1 is heated by the compressor heater 2 to maintain a constant temperature.

With the above configuration, at the start of the heating operation, the first solenoid valve 6 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. , The compressor 1 performs a pump-down operation, then the refrigerant pump 14, the refrigerant heater 15, and the indoor heat exchanger fan 9 start operating, and the compressor 1 is stopped.

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,
Furthermore, in a state in which the refrigerant leaks frequently into the outdoor heat exchanger, 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 has been a problem that a phenomenon such as abnormal rise of the temperature occurs, and a normal heating operation cannot be performed.

The present invention is intended to solve such a conventional problem, and an object of the present invention is to sufficiently recover the refrigerant to the heating circuit side at the time of starting the heating operation, thereby enabling a stable heating operation.

Means for Solving the Problems A compressor, a first check valve, a four-way valve, an outdoor heat exchanger, a throttle device, a second solenoid valve, an indoor heat exchanger, the four-way valve, and a compressor are sequentially connected, A refrigerant heater, a gas-liquid separator, and refrigerant conveying means are connected between the second solenoid valve and the indoor heat exchanger, and the gas-liquid separator is connected to the first check valve via a fourth check valve. Connected during the cooling operation, the second solenoid valve is opened, and the four-way valve is switched so that the discharge gas of the compressor flows to the outdoor heat exchanger. With a refrigerant circuit configuration that closes the valve and switches the four-way valve in the opposite direction to the time of cooling, the temperature detection means for detecting the temperature of the compressor, the refrigerant in the outdoor heat exchanger is driven by driving the compressor to allow the refrigerant in the room. A refrigerant recovery means for recovering the refrigerant in the heat exchanger, an oil recovery means for recovering the refrigerating machine oil in the refrigerant heater, Collecting means, a control device for controlling the amount of combustion of a combustion burner for driving the oil recovery means and for heating the refrigerant heater, wherein the control device compares a detected temperature of the temperature detecting means with a predetermined temperature; A first timer, a second timer having a longer set time than the first timer, and a switching unit that switches to a first timer when the temperature is higher than a predetermined temperature and to a second timer when the temperature is lower than a predetermined temperature based on the comparison result of the comparing unit. A refrigerant recovery control unit that drives the refrigerant recovery unit until the first and second timers reach a set time; and a strong combustion control that drives the combustion burner with strong combustion when the first timer reaches a set time. A third timer that starts operating when a second timer reaches a set time; a weak combustion control unit that drives the combustion burner with weak combustion while the third timer is operating; a third timer Is activated when the set time is reached A fourth timer, an oil recovery control unit that drives the oil recovery unit while the fourth timer is operating, and a transition to start of operation of the first timer when the fourth timer reaches a set time. It is provided with control means.

Effect of the Invention With the above-described configuration, the present invention increases the cooling recovery operation time at the start of the heating operation when the temperature of the compressor is high and short when the temperature of the compressor is low, thereby reliably recovering the refrigerant required for the heating operation, and A stable heating operation is possible by quickly and reliably recovering a large amount of refrigerant oil taken out when the temperature of the air conditioner is low.

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 a blower for an outdoor heat exchanger, 7 is an indoor heat exchanger, 8 is a blower for an outdoor heat exchanger, 9 is an accumulator, 10 is a refrigerant heater, and 11 is a combustion burner with a variable combustion amount for heating the refrigerant heater 10. , 12 is a gas-liquid separator, 13 is a liquid receiver, 14 is a first solenoid valve, which is located in a 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 A pipe 17 connecting the lower part of the receiver 13 and the lower part of the gas-liquid separator 12 with a valve
Let's position it inside. Reference numeral 18 denotes a third check valve which is the indoor heat exchanger 7
And the upper part of the receiver 13 in the pipe 19. Reference numeral 20 denotes a fourth check valve, which is located in a pipe 22 connecting the upper part of the gas-liquid separator 12 and a pipe 21 connecting the first check valve 3 and the four-way valve 4. 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 pipes connecting the outdoor heat exchanger 5 and the lower part of the refrigerant heater 10.
Positioned in series during 24. 26 is the third solenoid valve 26 and the second
The third solenoid valve 26 and the second capillary tube 27 are arranged in series in a pipe 29 connecting a pipe 28 connecting the lower part of the gas-liquid separator 12 and the lower part of the refrigerant heater and a pipe 29 connecting the pipe 19. Upper part of refrigerant heater 10 and gas-liquid separator
The upper part of 12 is 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-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 four-way valve 4 is switched in the direction opposite to that in the cooling operation, and the refrigerant in the refrigerant heater 10 is heated by heating the refrigerant heater 10 with the combustion burner 11 having a variable combustion amount, and the gas-liquid separator The refrigerant in the gas phase, which has become high temperature in 12, is pushed out to the indoor heat exchanger 7 through the pipe 22, the fourth check valve 20, and the four-way valve 4, and radiates heat in the indoor heat exchanger 7 to heat the room. The liquefied refrigerant liquid moves through the pipe 19 and the third check valve 18 into the liquid receiver 13. The refrigerant liquid accumulated in the liquid receiver 13 opens the first solenoid valve 14, and guides the pressure of the gas-liquid separator 12, thereby causing the liquid receiver 13 and the gas-liquid separator 12 to open.
Is returned to the gas-liquid separator 12 through the second check valve 16. As described above, the opening / closing operation of the liquid receiver 13 and the first solenoid valve 14 and the check operation of the third check valve 18 and the check valve 18 allow the refrigerant that is the heat transfer medium to operate without the compressor 1 operating. Can be done at That is, the liquid receiver 13, the first solenoid valve 14, and the third check valve
18 is the refrigerant conveying means 32.

Before performing the heating operation, a recovery operation of recovering the refrigerant in the outdoor heat exchanger 5, the accumulator 9, and the compressor 1 that is not a heating circuit to the heating circuit side is performed. With the four-way valve 4 in the same direction as during the heating operation, the compressor 1 is operated in a state where the outdoor heat exchanger 5 is in communication with the accumulator 9, and the outdoor heat exchanger 5, the accumulator 9 and the refrigerant of the compressor 1 are heated by the indoor heat. Collected in 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 return the liquid refrigerant from the pipe 19 to the receiver 13 easily. That is, the compressor 1, the first check valve 3, and the four-way valve 4 constitute the refrigerant recovery means 33. During the heating operation, the refrigerating machine oil taken out to the heating circuit side is supplied to the refrigerant heater 10.
When the refrigerant is condensed, the flow of the refrigerant in the refrigerant heater 10 deteriorates, and there is a risk of causing abnormal heating due to poor heat exchange. Therefore, it is necessary to recover oil early. When the second solenoid valve 24 is opened, the refrigerating machine oil condensed in the lower portion of the heater 10 flows out to the outdoor heat exchanger 5. The spilled oil can be collected in the compressor 1 by operating the compressor 1. That is, the second solenoid valve 24 is an oil collecting means. 34 is a temperature detecting means for detecting the temperature of the compressor 1; 35 is a control device for driving the refrigerant collecting means 33 and the oil collecting means (second electromagnetic valve) 24 and controlling the amount of combustion of the combustion burner 11; Is a recovery control unit that drives the recovery unit, 37 is a strong combustion control unit of the combustion burner 11, 38 is a weak combustion control unit of the combustion burner 11, 39 is an oil recovery control unit that drives the oil recovery unit 24, and 40 is a first recovery control unit. Timer,
41 is a second timer having a set time longer than the first timer, 42 is a switching unit for switching between the first timer 40 and the second timer 41, and 43 is a device for comparing the temperature detected by the temperature detecting means 34 with a predetermined temperature. When the detected temperature is higher than the predetermined temperature in the comparing unit, the switching unit 42 operates as if a first timer having a short set time is operated.
When the detected temperature is lower than the predetermined temperature, the switching unit 42 is switched so as to operate the second timer having a long set time, and either timer is started, and the collection control unit 36 is operated until the timer elapses the set time. Activated collection means
Drive 33. When the timer elapses the set time, the recovery means 33 is stopped, and when the set time of the first timer 40 elapses, the strong combustion control section 37 is operated to drive the combustion burner 11 by strong combustion. When the set time of the second timer 41 elapses, the second timer
44 is started, and the weak burn control unit 38 is operated until the third timer 44 elapses the set time to drive the burner 11 with weak burn. When the set time of the third timer 44 elapses, the weak combustion is stopped, the fourth timer 45 is started, and the oil recovery control unit 39 is operated until the fourth timer 45 elapses the set time to activate the oil recovery means. Drive, and when the set time of the fourth timer 45 has elapsed, the first timer 40 is started.
The collection control unit 36 is operated until the set time elapses to drive the collection unit 33, and at the time when the set time of the first timer 40 elapses, the strong combustion control unit 37 is operated to drive the combustion burner 11 by strong combustion. . As shown in FIG. 2, the refrigerant recovery time depends on the temperature of the compressor 1, and is shorter when the temperature is high and longer when the temperature is low. setting may be set slightly lower than the temperature, the refrigerant recovery duration t ₁ required at the time of the set temperature Ts and the set time of the first timer 40, the temperature T _L close to the minimum outside air temperature during the heating operation period the corresponding time t ₂ by a set time of the second timer 41, sufficiently refrigerant recovery is performed regardless of the temperature of the compressor 1, it is the heating operation. In addition, when the temperature of the compressor 1 is sufficiently high, a short refrigerant recovery operation can be performed, so that power consumption during refrigerant recovery can be reduced. When the temperature of the compressor 1 is low, a large amount of refrigerating machine oil is taken out as shown in FIG. 3, but the temperature rise in the refrigerant heater 10 is low because the combustion burner 11 is operated in weak combustion for a certain time after the refrigerant recovery operation. The heater is pressed to allow continuous operation, and during the heating operation in the weak combustion, the refrigerating machine oil taken out to the heating circuit side is condensed into the heater 11, and then the second solenoid valve 24 serving as oil recovery means is driven. As a result, the oil recovery can be reliably performed, and the next heating operation can be stabilized.

FIG. 4 shows a flowchart in the case where the above processing flow is realized by a microcomputer. In FIG. 4, the numbers of the parts having functions are written horizontally.

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

(1) The refrigerant recovery operation time at the start of the heating operation is detected by detecting the temperature of the compressor. When the temperature is higher than a predetermined temperature, the time is shortened by the first timer, and when the temperature is low, the time is measured by the second timer. , The refrigerant required for the heating circuit is reliably recovered, and a stable heating operation can be obtained.

(2) When the recovery operation time may be short, the heating start-up is fast and the power consumption can be reduced.

(3) A large amount of refrigerating machine oil is taken out during the refrigerant recovery operation when the compressor temperature is low. However, the heating operation is performed by weak combustion for a certain period of time, and the reliable oil recovery is performed at an early stage. There is an effect that stabilization becomes possible.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a system block diagram of a control device of a heating / cooling device in one embodiment of the present invention, FIG. 2 is a characteristic diagram of a compressor temperature and a time required for refrigerant recovery, and FIG. FIG. 4 is a flow chart showing the flow of processing of the microcomputer, and FIG. 5 is a configuration 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, 11 ... combustion burner with variable combustion, 12 ... gas-liquid separator, 20 ... fourth check valve, 23 ... First capillary tube, 24 second solenoid valve, 27 second capillary tube, 32 refrigerant transfer means, 33 refrigerant recovery means, 34
Temperature detecting means, 35 ... Control device, 36 ... Refrigerant recovery control section, 37 ... Strong combustion control section, 38 ... 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.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-1-302076 (JP, A) JP-A-57-67759 (JP, A) JP-A-59-32759 (JP, A) (58) Field (Int.Cl. ⁶ , DB name) F25B 13/00 341 F24F 11/02 102

Claims (1)

(57) [Claims] 1. A compressor, a first check valve, a four-way valve, an outdoor heat exchanger, a throttle device, a second solenoid valve, an indoor heat exchanger, the four-way valve, and a compressor are sequentially connected to each other. A refrigerant heater, a gas-liquid separator, and a refrigerant conveying means are connected between the second electromagnetic valve and the indoor heat exchanger, and the gas-liquid separator is connected to the first check valve via a fourth check valve in all directions. Connected to the valve, open the second solenoid valve during the cooling operation, switch the four-way valve so that the discharge gas of the compressor flows to the outdoor heat exchanger, and switch the second solenoid valve during the heating operation A refrigerant circuit configuration that closes and switches the four-way valve to the direction opposite to that for cooling, temperature detection means for detecting the temperature of the compressor, and driving the compressor to exchange refrigerant in the outdoor heat exchanger with the indoor heat exchange. Refrigerant collecting means for collecting refrigerant oil in the refrigerant heater, oil collecting means for collecting refrigeration oil in the refrigerant heater, A control unit for controlling the driving of the means and controlling the combustion amount of the combustion burner for heating the refrigerant heater, the control unit comparing a detected temperature of the temperature detecting means with a predetermined temperature, and a first timer A second timer having a set time longer than the first timer; a switching unit for switching to a first timer when the temperature is higher than a predetermined temperature as a result of comparison by the comparing unit; A refrigerant recovery control unit that drives the refrigerant recovery unit until the second timer reaches a set time; a strong combustion control unit that drives the combustion burner with strong combustion when the first timer reaches a set time; A third timer that starts operating when the third timer reaches a set time, a weak combustion control unit that drives the combustion burner by weak combustion while the third timer is operating, and a third timer that starts operating when the third timer reaches a set time. Fourth tap to start operation An oil collection control unit that drives the oil collection unit during a period in which a fourth timer is operating; and a control unit that shifts to starting operation of the first timer when the fourth timer reaches a set time. Heating and cooling machine.