JP2712589B2 - Air conditioning - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for performing cooling and heating by connecting an indoor / outdoor unit to a refrigerant pipe, and in particular, heats a refrigerant by a burner or the like and heat-transports to an indoor unit for heating. The present invention relates to a cooling and heating device.

2. Description of the Related Art Conventionally, as shown in FIG. 3, a cooling / heating apparatus of this type heats a refrigerant heater 2 with a burner 1, and a heated and vaporized refrigerant passes through a pressure equalizing pipe 3 and is transferred from a gas-liquid separator 4 to a fourth The air is pressure-fed to the indoor heat exchanger 7 via the check valve 5 and the four-way valve 6, radiated and condensed into a liquid refrigerant, and flows into the receiver 9 via the second check valve 8. When the liquid refrigerant accumulates in the liquid receiver 9, the on-off valve 10 is opened, and the liquid refrigerant by its own weight is supplied from the liquid receiver 9 disposed above the refrigerant heater 2 to the first check valve 11, gas-liquid The refrigerant flows into the refrigerant heater 2 via the separator 4. At this time, the refrigerant heater 2 and the liquid receiver 9
Is equalized by the equalizing pipe 3, and the liquid refrigerant from the indoor heat exchanger 7 does not flow into the receiver 9 by the second check valve 8. Next, when the liquid refrigerant in the liquid receiver 9 runs out, the on-off valve 10 is closed, and the condensed liquid refrigerant pools in the liquid receiver 9 again. At this time, the liquid refrigerant flowing into the liquid receiver 9 by the first check valve 11 does not flow to the gas-liquid separator 4 and the refrigerant heater 2. Further, the first to third solenoid valves 12, 13, and 14 are closed.

As described above, by repeatedly opening and closing the on-off valve 10, the liquid refrigerant is intermittently supplied from the liquid receiver 9 to the refrigerant heater 2 via the gas-liquid separator 4, and is vaporized by the refrigerant heater 2. The cycle in which the refrigerant is pressure-fed to the indoor heat exchanger 7 is repeated during the heating operation.

Also, most refrigerants (mainly liquid refrigerants) at the start of heating
Is in the indoor heat exchanger 7 (for example, the indoor heat exchanger 7
Is lower than the other components. Alternatively, the temperature of the indoor heat exchanger 7 during heating is lower than the temperatures of the other components. )
If there is no refrigerant in the receiver 9, the gas-liquid separator 4, and the refrigerant heater 2,
When the gas refrigerant exists between the indoor heat exchanger 7 and the second check valve 8, it takes time until the liquid refrigerant returns to the receiver 9, and the refrigerant may not be supplied to the refrigerant heater 2. As a result, the temperature of the refrigerant in the refrigerant heater 2 rises abnormally, and the thermal stability of the refrigerant and, consequently, the reliability of the system is reduced or the heating start is delayed.

In order to prevent such a problem, the applicant has proposed that the first and second solenoid valves be used before heating the refrigerant by the burner 1 at the time of starting heating.
By opening the compressors 12 and 13 and driving the compressor 15 for a certain period of time, the refrigerant in the receiver 9 is sucked into the compressor 15 via the outdoor heat exchanger 16 so that the liquid accumulated in the indoor heat exchanger 7 A cycle in which the refrigerant is sucked into the receiver 9 and the gas refrigerant between the indoor heat exchanger 7 and the second check valve 8 is removed, the liquid refrigerant is secured in the receiver 9 in a short time, and heating is started. Was proposed by Japanese Patent Application No. 63-133282.

Problems to be Solved by the Invention However, in the above-described configuration, the liquid refrigerant does not accumulate in the indoor heat exchanger 7 during frequent heating on / off (for example, on / off by indoor room thermo), or the indoor heat exchanger 7 Even when no gas refrigerant is accumulated between the second check valves 8, since the compressor 15 is driven at the time of starting heating, there are problems such as an increase in exercise cost and a decrease in the reliability of the compressor 15.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and has as its object to reduce the operating cost of the apparatus and improve the reliability of the compressor.

Means for Solving the Problems To solve the above problems, a cooling and heating device of the present invention includes a refrigerant heater provided with an on-off valve, a liquid receiver, a first check valve, a gas-liquid separator, and a burner provided in order from the top. A suction pipe communicating the refrigerant heater with the lowermost part of the gas-liquid separator, an outlet pipe communicating the upper part of the gas-liquid separator from the refrigerant heater, and an equalizing pipe communicating the upper part of the gas-liquid separator with the on-off valve inlet. A refrigerant drain pipe branched from the equalizing pipe, a drain pipe branched from the refrigerant drain pipe and communicated with the lower part of the refrigerant heater, a return pipe at the upper part of the liquid receiver, and a second check valve provided at the return pipe. A heat transfer and heating block including a pressure reducing mechanism provided in parallel with the second check valve, a refrigerant vent pipe in the heat transfer and heating block, a solenoid valve, an outdoor heat exchanger, a four-way valve, and an accumulator. , A compressor, a third check valve, a four-way valve, The indoor heat exchanger is connected to a return pipe via a second check valve and a pressure reducing mechanism, and further from the gas-liquid separator via a fourth check valve, between the four-way valve and the third check valve. Provide a heating pipe to connect,
During cooling, the refrigerant is supplied to the compressor, the third check valve, the four-way valve,
The circuit flows in the order of the outdoor heat exchanger and the solenoid valve, flows from the solenoid valve to the refrigerant vent pipe and the vent pipe, enters the refrigerant vent pipe to the on-off valve, and the refrigerant heater from the vent pipe to the outlet pipe, the suction pipe, and the air. It flows through two circuits: a liquid separator, a circuit that joins from the pressure equalizing pipe to the refrigerant drain pipe, and enters the on-off valve. From the on-off valve, the liquid receiver, decompression mechanism, indoor heat exchanger, four-way valve, accumulator, and compressor While being configured to circulate, during heating, the refrigerant is a refrigerant heater, a gas-liquid separator, a heating conduit, a four-way valve, an indoor heat exchanger, a liquid receiver, a first check valve, a gas-liquid separator, If it is configured to circulate to the refrigerant heater, and if the time from the stop of heating to the restart of heating is a predetermined time or more, the on-off valve and the solenoid valve are opened, and the refrigerant in the liquid receiver is opened and closed. , The refrigerant in the refrigerant heater is allowed to flow into the solenoid valve through the refrigerant drain pipe, and the refrigerant in the refrigerant heater is drained through the solenoid valve through the drain pipe. And allowed to flow, the inflow refrigerant from the electromagnetic valve, an outdoor heat exchanger, a four-way valve, through an accumulator, is a structure in which a control mechanism for operating a certain time of the compressor to push to the indoor heat exchanger. That is, focusing on the fact that it takes time for the refrigerant to accumulate in the indoor heat exchanger after the heating is stopped, counting the time from the previous heating stop to the heating restart, and within a predetermined time, without operating the compressor. If the burner is ignited and the heating is restarted and the heating is restarted for a predetermined time or longer, the compressor is driven for a certain time before heating the refrigerant by the burner when the heating is restarted, and the refrigerant in the receiver and the refrigerant heater is opened and closed. It has a control mechanism that pushes out to the indoor heat exchanger via a solenoid valve, an outdoor heat exchanger, a four-way valve, and an accumulator.

Action The present invention, by the above configuration, if the time from the previous heating stop to the heating restart is a predetermined time or more, at the time of heating restart, open the on-off valve, solenoid valve before heating the refrigerant by the burner, The compressor is driven for a certain period of time, a new liquid refrigerant is secured in the receiver and the heater, and then the refrigerant is heated by the burner. If it is within a predetermined time, the refrigerant is immediately heated by the burner. As a result, it is possible to guarantee a reliable heating start at the time of heating ON / OFF, reduce the drive time of the compressor, and reduce the number of times of ON / OFF, thereby reducing the operating cost and ensuring the reliability of the compressor.

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

FIG. 1 shows the overall configuration of a cooling and heating apparatus according to the present invention, in which 17 is an outdoor unit, 18 is an indoor unit, and 19 and 20 are refrigerant pipes connecting the outdoor unit 17 and the indoor unit 18. 21 is a heat transfer heating block used for heating,
A refrigerant heater having an open / close valve 22, a liquid receiver 23, a first check valve 24, a gas-liquid separator 25, and a burner 26 at the lowermost part in order from the top.
There are 27. Also, a suction pipe 28 connecting the refrigerant heater 27 and the lowermost part of the gas-liquid separator 25, an outlet pipe 29 connecting the refrigerant heater 27 to the upper part of the gas-liquid separator 25, and an inlet / closing valve 22 inlet from the upper part of the gas-liquid separator 25. Equalizing tube 30 provided in the tank, Refrigerant drain tube 3 branched from equalizing tube 30
1, a drain pipe 32 branched from the refrigerant drain pipe 31 and connected to the refrigerant heater 27, a return pipe 33 provided so that the refrigerant flows in from the upper part of the liquid receiver 23, and a second reverse pipe provided in the return pipe 33. Stop valve 34, second
The pressure reducing mechanism 35 provided in parallel with the check valve 34 is configured as a main member. 36 is a compressor, 37 is a third check valve provided between the compressor 36 and the four-way valve 38, and 39 is a four-way valve from above the gas-liquid separator 25.
38, a fourth check valve 40 is provided in the middle of the heating pipe extending between the third check valve 37 and the heating pipe. 41 is an outdoor heat exchanger from the refrigerant vent pipe 31
This is an electromagnetic valve provided to reach 42, and the outdoor heat exchanger 42 and the four-way valve 38 are in communication.

Also, the second check valve 34 and the indoor heat exchanger in the indoor unit 18
43 is communicated with the refrigerant pipe 20. On the other hand, the four-way valve 38 and the indoor heat exchanger 43 in the indoor unit 18 are connected by the refrigerant pipe 19. Reference numeral 44 denotes an accumulator provided between the four-way valve 38 and the suction side of the compressor 36, and reference numeral 45 controls the on-off valve 22, the solenoid valve 41, the burner 26, and the compressor 36 by turning on / off (heating on / off) the indoor room thermo 46. It is a control mechanism, and the control flow is as shown in FIG.

In the above configuration, during the cooling operation, the four-way valve 38 is turned on (dotted line in the figure), the solenoid valve 41 and the on-off valve 22 are open, and the high-temperature and high-pressure gas refrigerant discharged from the compressor 36
The air enters the outdoor heat exchanger 42 through the check valve 37 and the four-way valve 38.

After being radiated and condensed in the outdoor heat exchanger 42, the refrigerant passes through the solenoid valve 41 and is diverted to the refrigerant vent pipe 31 and the vent pipe 32. The refrigerant diverted to the drain pipe 32 passes through the refrigerant heater 27, the outlet pipe 29, the suction pipe 28, enters the gas-liquid separator 25, passes through the pressure equalizing pipe 30, and passes through the refrigerant drain pipe 31.
To join. After merging, on-off valve 22, liquid receiver 23, return pipe 33
, And enters the pressure reducing mechanism 35. The refrigerant decompressed and expanded by the cooling decompression mechanism 35 enters the indoor heat exchanger 43 through the refrigerant pipe 20,
After being vaporized and gasified, the refrigerant returns to the compressor 36 via the refrigerant pipe 19, the four-way valve 38, and the accumulator 44. Cooling is performed by this cycle.

On the other hand, during the heating operation, the four-way valve 38 is in the off state (solid line in the figure), the solenoid valve 41 is in the closed state, and the on-off valve 22 repeats the opening / closing operation to start burning the burner 26.

Here, the liquid refrigerant accumulated in the liquid receiver 23 passes through the first check valve 24 and the gas-liquid separator 25, and is supplied from the suction pipe 28 to the refrigerant heater 27. The refrigerant heated by the burner 26 in the refrigerant heater 27 is
Only the gas refrigerant from the outlet pipe 29 through the gas-liquid separator 25 is heated
After passing through 39, the refrigerant is pressure-fed from the refrigerant pipe 19 to the indoor heat exchanger 43 via the fourth check valve 40 and the four-way valve 38 to be condensed and liquefied. At this time, if the on-off valve 22 is in the closed state, the condensed and liquefied refrigerant flows into the receiver 23 through the refrigerant line 20, the return pipe 33, and the second check valve 34, and the receiver 23 When the liquid refrigerant accumulation is completed, the on-off valve
22 is opened, and the refrigerant in the receiver 23
Due to the pressure of 30, the gas flows from the first check valve 24 to the gas-liquid separator 25, and from the gas-liquid separator 25 to the refrigerant heater 27 by the suction pipe 28. When the on-off valve 22 is open, the condensed liquid refrigerant does not flow into the liquid receiver 23.

The above operation is repeated, the liquid refrigerant is intermittently supplied to the refrigerant heater 27, and the gas refrigerant is pressure-fed to the indoor heat exchanger 43.

On the other hand, during the heating operation and when the indoor room thermo 46 is turned on and off, as shown in the control flow of FIG. 2, the control mechanism 45 determines whether the temperature of the indoor room thermo 46 has reached the OFF set temperature. The combustion of 26 turns off and the timer count starts. After the timer count is started, it is determined whether or not the temperature of the room thermo 46 has reached the ON set temperature, and if so, it is determined whether or not the timer has reached a predetermined time at that time. If the timer has not reached the predetermined time, the on-off valve 22 opens and closes, ignites the burner 26, heats the refrigerant with the refrigerant heater 27, and enters a normal heating operation. On the other hand, if the timer has reached the predetermined time, first the on-off valve 22, the solenoid valve 41 is opened, the compressor 36 is driven, the refrigerant in the liquid receiver 23, via the on-off valve 22, the refrigerant drain pipe 31 A pipe that allows the refrigerant to flow into the solenoid valve 41 and drain the refrigerant in the refrigerant heater 27
The refrigerant flows into the electromagnetic valve 41 through the electromagnetic valve 41, and is sucked into the compressor 36 from the electromagnetic valve 41 through the outdoor heat exchanger 42, the four-way valve 38, and the accumulator 44. The refrigerant drawn into the compressor 36 passes through the third check valve 37 and the four-way valve 38 and is discharged to the indoor heat exchanger 43. When the refrigerant in the liquid receiver 23 is drained, the liquid refrigerant accumulated in the indoor heat exchanger 43 is discharged to the refrigerant pipe 20, the return pipe 33, the second pipe.
Through the check valve 34, it flows into the liquid receiver 23 and also into the refrigerant heater 27. Further, if there is a gas refrigerant in the refrigerant pipe 20 and the return pipe 33, the gas refrigerant is simultaneously drawn into the compressor 36 from the liquid receiver 23 and the refrigerant heater 27. The timer is counted at the same time as the compressor 36 is driven, and when the timer exceeds a certain time, the on-off valve 22 and the solenoid valve 41 are closed first, the refrigerant accumulated in the outdoor heat exchanger 42 is pumped, and the timer is later set to the set time. Then, the compressor 36 stops. After the compressor 36 is stopped, the on-off valve 22 performs an opening / closing operation, ignites the burner 26, heats the refrigerant by the refrigerant heater 27, and enters a normal heating operation. As described above, the presence or absence of the operation of the on-off valve 22, the solenoid valve 41, and the compressor 36 is determined based on the time from the previous heating stop to the heating restart. This ensures a reliable heating start during frequent heating on / off such as turning on / off the indoor room thermo 46, and reduces the driving time and the number of on / off times of the compressor 36 to reduce the operating cost and ensure the reliability of the compressor 36. it can.

Effect of the Invention As described above, according to the cooling / heating device of the present invention, at the time of heating restart, the time from the previous heating stop to the time of heating restart is counted, and if it is within a predetermined time, the compressor is not operated. When the burner is ignited, the refrigerant is heated and the heating is restarted. If it is longer than a predetermined time, the compressor is driven for a certain time before the refrigerant is heated by the burner, and the refrigerant in the liquid receiver and the refrigerant heater is opened and closed. By providing a control mechanism for extruding to the indoor heat exchanger via the solenoid valve, outdoor heat exchanger, four-way valve, and accumulator, and then restarting the burner ignition heating, reliable heating against frequent heating on / off The start-up guarantee, the start-up time of the compressor, and the number of on / off times can be minimized to reduce the operating cost and ensure the reliability of the compressor.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a refrigerant circuit of a cooling and heating device according to an embodiment of the present invention, FIG. 2 is a control flowchart of a control mechanism of the present invention, and FIG. 3 is a configuration diagram of a refrigerant circuit of a conventional cooling and heating device. 21 heat transfer heating block, 22 on-off valve, 23 liquid receiver, 24 first check valve, 25 gas-liquid separator, 26 burner, 27 refrigerant heater, 34 second check valve, 35 pressure reducing mechanism, 36 compressor, 37 third check valve, 38 four-way valve, 41 solenoid valve, 42 outdoor heat exchanger, 43 ... indoor heat exchanger, 44 ... accumulator, 45 ... control mechanism.

Claims (1)

(57) [Claims] An on-off valve, a liquid receiver, and a first valve provided in this order from the top.
A check valve, a gas-liquid separator, a refrigerant heater equipped with a burner,
A suction pipe communicating the refrigerant heater with the lowermost part of the gas-liquid separator, an outlet pipe communicating the refrigerant heater with the upper part of the gas-liquid separator, an equalizing pipe communicating the upper part of the gas-liquid separator with the on-off valve inlet, A refrigerant drain pipe branched from the pressure pipe, a drain pipe branched from the refrigerant drain pipe and communicating with the lower part of the refrigerant heater, a return pipe at the upper part of the receiver, and a second check valve provided in the return pipe, A heat transfer and heating block including a pressure reducing mechanism provided in parallel with the second check valve, a refrigerant vent pipe in the heat transfer and heating block, an electromagnetic valve, an outdoor heat exchanger, a four-way valve, an accumulator,
Connecting a compressor, connecting the compressor, a third check valve, a four-way valve, an indoor heat exchanger, a return pipe via a second check valve and a pressure reducing mechanism, A heating pipe line is provided between the gas-liquid separator and the fourth check valve via the fourth check valve, and is connected between the four-way valve and the third check valve.
A third check valve, a four-way valve, an outdoor heat exchanger, and a solenoid valve flow in this order, the refrigerant is diverted from the solenoid valve to a refrigerant vent pipe and a vent pipe, and a circuit enters the on-off valve from the refrigerant vent pipe, and the refrigerant is heated from the vent pipe. Flow from the on-off valve, the outlet pipe, the suction pipe, the gas-liquid separator, and the circuit that joins the equalizing pipe to the refrigerant vent pipe and enters the on-off valve.
A receiver, a decompression mechanism, an indoor heat exchanger, a four-way valve, an accumulator, and a configuration to circulate to the compressor,
At the time of heating, the refrigerant circulates to the refrigerant heater, the gas-liquid separator, the heating conduit, the four-way valve, the indoor heat exchanger, the receiver, the first check valve, the gas-liquid separator, and the refrigerant heater. If the time from when the heating is stopped to when the heating is restarted is equal to or longer than a predetermined time, the on-off valve and the solenoid valve are opened, and the refrigerant in the receiver is supplied to the solenoid valve via the on-off valve and the refrigerant vent pipe. , And the refrigerant in the refrigerant heater flows into the solenoid valve through the drain pipe,
A cooling and heating device provided with a control mechanism for operating a compressor for a certain period of time so as to push the inflow refrigerant from an electromagnetic valve to an indoor heat exchanger via an outdoor heat exchanger, a four-way valve, and an accumulator.