JPH03156257A - Air conditioning equipment - Google Patents

Abstract

PURPOSE:To reduce operating cost and improve the reliability in operation of a compressor by a method wherein when the heating operation is restarted, an opening or closing valve and a solenoid valve are opened, a compressor is driven for a specified period of time, new liquid refrigerant is kept in a liquid receiver and a heater and then the refrigerant is heated by a burner. CONSTITUTION:A timer is counted in concurrent with driving of a compressor 36. As the timer exceeds a specified period of time, an opening or closing valve 22 and a solenoid valve 41 are closed to suck up refrigerant accumulated in an outdoor heat exchanger 42. After this state, if the timer shows a specified time, the compressor 36 is stopped. After stopping of the compressor 36, the opening or closing valve 22 may perform an opening or closing operation, ignite a burner 26, the refrigerant is heated by a refrigerant heater 27 and then a normal heating operation is started. In this way, it is calculated that a temperature difference between one under a stopped heating operation and the refrigerant heater 27 is increased or decreased, a presence or absence of refrigerant in the refrigerant heater 27 is judged. Presence or absence of operation of the opening or closing valve 22, solenoid valve 41 and compressor 36 when the heating operation is started again is judged. With such an arrangement, a positive heating energization when a troublesome heating on-off operation such as a turning-on or -off of an indoor thermocouple 46, a driving time of the compressor 36 and the number of turning-on or turning-off operation can be reduced, an operation cost can be reduced and the reliability of the compressor 36 can be assured.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to an apparatus for heating and cooling by connecting indoor and outdoor units with refrigerant piping, in particular, heating the refrigerant with a burner or the like and transferring the heat to the indoor unit for heating. This relates to heating and cooling equipment.

2. Description of the Related Art Conventionally, as shown in FIG. 3, this type of air conditioning system heats a refrigerant heater 2 with a burner 1, and the heated and vaporized refrigerant passes through a pressure equalization pipe 3 and is transferred from a gas-liquid separator 4 to a fourth Check valve 5. The refrigerant is fed under pressure to the indoor heat exchanger 7 via the four-way valve 6, heats up and condenses to become a liquid refrigerant, and flows into the liquid receiver 9 via the second check valve 8. When the liquid refrigerant accumulates in the liquid receiver 9, the on-off valve 10 opens, and the liquid refrigerant flows under its own weight from the liquid receiver 9, which is disposed above the refrigerant heater 2, to the first check valve 11. It flows into the refrigerant heater 2 via the gas-liquid separator 4. At this time, the pressures of the refrigerant heater 2 and the liquid receiver 9 are equalized by the pressure equalizing pipe 3, and the second check valve 8 prevents the liquid refrigerant from flowing into the liquid receiver 9 from the indoor heat exchanger 7. When the liquid refrigerant in the liquid receiver 9 runs out, the on-off valve 10
is closed and condensed refrigerant accumulates in the liquid receiver 9 again.
At this time, the liquid refrigerant flowing into the liquid receiver 9 by the first check valve 11 is transferred to the gas-liquid separator 4. The refrigerant does not flow to the heater 2, and the
The third is a magnetic valve, and 12, 13, and 14 are in a closed state.

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

Also, when heating is started, when most of the refrigerant (mainly liquid refrigerant) is in the indoor heat exchanger H7 (for example, the indoor heat exchanger 7 is at a lower position than other components), or when the indoor heat exchanger 7 is at a lower position than other components. the temperature of the exchanger 7 is lower than the temperature of the other components) receiver 9. If there is no refrigerant in the gas-liquid bone M device 4 or refrigerant heater 2, or if gas refrigerant is present between the indoor heat exchanger 7 and the second check valve 8, the liquid refrigerant will not return to the liquid receiver 9. , takes time,
Refrigerant may not be replenished to the refrigerant heater 2, and the refrigerant temperature in the refrigerant heater 2 will rise abnormally, reducing the thermal stability of the refrigerant and thus the reliability of the system, or delaying the start of heating.

In order to prevent such problems, the applicant has proposed that when starting heating, before heating the refrigerant with burner 1,
2.13 is opened, the constant 111.1 pressure m machine 15 is driven, and the refrigerant in the liquid receiver 9 is sucked into the compressor 15 via the outdoor heat exchanger 16, thereby transferring the refrigerant to the indoor heat exchanger 7. The accumulated liquid refrigerant is sucked into the liquid receiver 9 and the indoor heat exchanger 7
and the second check valve 8, and the liquid receiver 9 is removed in a short time.
Japanese Patent Application No. 63-133282 proposed a cycle in which heating is started by securing liquid refrigerant.

Problems to be Solved by the Invention However, with the above configuration, when heating is frequently turned on and off (for example, when turned on and off by an indoor room thermostat), there is a possibility that liquid refrigerant does not accumulate in the indoor heat exchanger 7 or that the indoor heat exchanger 7 Since the compressor 5 is driven when heating is started even when there is no gas refrigerant accumulated between the second check valves 8, there are problems such as an increase in operating costs and a decrease in the reliability of the compressor 15.

The present invention has solved these problems, and aims to reduce the operating cost of the device and improve the reliability of the compressor.

Means for Solving the Problems In order to solve the above-mentioned problems, the air-conditioning and heating apparatus of the present invention is such that after heating is stopped, the refrigerant in the refrigerant heater flows to the indoor heat exchanger due to the residual heat of the refrigerant heater. We focused on the fact that the temperature of the refrigerant heater rises when the refrigerant becomes low, and if this temperature rise occurs, when the heating is restarted, the compressor is driven for a certain period of time before heating the refrigerant with the burner, and the receiver The refrigerant heater is configured to have a control mechanism that pushes the refrigerant in the refrigerant heater to the indoor heat exchanger via an on-off valve, a solenoid valve, an outdoor heat exchanger, a four-way valve, and an accumulator.

Effect: With the above-described configuration, the present invention constantly monitors the temperature of the refrigerant heater from the previous heating stop, and if the temperature rises, the on-off valve and the tM1 valve are opened before heating the refrigerant with the burner when the heating is restarted. , the compressor is driven for a certain period of time, new liquid refrigerant is secured in the liquid receiver and the heater, and then the refrigerant is heated by the burner, and if it is within the predetermined time, the refrigerant is immediately heated by the burner. This ensures reliable heating start-up when heating is turned on and off, reduces the driving time of the compressor, and reduces the number of times the compressor is turned on and off, thereby reducing operating costs and ensuring the reliability of the compressor.

Embodiment Hereinafter, one embodiment of the present invention will be described based on the accompanying drawings.

FIG. 1 shows the overall configuration of a heating and cooling system according to the present invention, in which 17 is an outdoor unit, 18 is an indoor unit, 19.
20 is a refrigerant pipe connecting the outdoor unit 17 and the indoor unit 1B. Reference numeral 21 denotes a heat transfer heating block used during heating, which includes, in order from the top, an on-off valve 22, a liquid receiver 23.
First check valve 24. A gas-liquid separator 25 is provided, and a refrigerant heater 27 having a burner 26 is provided at the bottom. In addition, there is a suction pipe 28 that connects the refrigerant heater 27 and the lowest part of the gas-liquid separator 25, an outlet pipe 29 that connects the upper part of the gas-liquid separator 25 from the refrigerant heater 27, and an on-off valve 22 that connects the upper part of the gas-liquid separator 25. A pressure equalizing pipe 30 provided in the pressure equalizing pipe 30, a refrigerant extraction pipe 31 branched from the pressure equalizing pipe 30,
A vent pipe 32 branched from the refrigerant vent pipe 31 and connected to the refrigerant heating 830, a return pipe 33 provided so that the refrigerant flows from the upper part of the receiver 23, and a second check valve provided in the return pipe 33. 34, a cooling pressure reducing mechanism 35 provided in parallel with the second check valve 34 is configured as a main component. 36 is a compressor;
7 is a third check valve provided between the compression 8136 and the four-way valve 38, and 39 is a third check valve provided between the compression 8136 and the four-way valve 38. A fourth check valve 40 is provided in the middle of the heating pipe line extending between the third check valves 37. 41 is a connection from the refrigerant extraction pipe 31 to the outdoor heat exchanger 42
The outdoor heat exchanger 42 and the four-way valve 38 are in communication with each other.

Further, the second check valve 34 and the indoor heat exchanger 43 in the indoor unit 18 are communicated through a refrigerant pipe 20. On the other hand, the four-way valve 38 and the indoor heat exchanger 43 in the indoor unit 8 are communicated through a refrigerant pipe 19. 44 is a four-way valve 38 and a compressor 36
45 is a temperature detector provided in the refrigerant heater 27, and 46 is an accumulator provided between the suction side of the refrigerant heater 27, and 46 is an on/off valve 22. Solenoid valve 41, burner 26
．． This is a control mechanism that controls compression 8136, and its control flow is as shown in FIG.

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

After heat dissipation and condensation in the outdoor heat exchanger 42, the refrigerant passes through the solenoid valve 41.
The refrigerant is divided into a refrigerant extraction pipe 31 and a extraction pipe 32 through the refrigerant.

The refrigerant diverted to the extraction pipe 32 is sent to the refrigerant heater 27. Outlet pipe 29. After passing through the suction pipe 28, entering the gas-liquid separator 25, passing through the pressure equalization pipe 30, and merging with the refrigerant extraction pipe 31,
Open/close valve 22. Receiver 23. It passes through the return pipe 33 and enters the cooling pressure reduction mechanism 35. The refrigerant that has been decompressed and expanded by the cooling pressure reducing mechanism 35 enters the indoor heat exchanger 43 from the refrigerant pipe 20, and after being evaporated and gasified, the refrigerant is transferred to the refrigerant pipe 19. It returns to the compressor 36 via a four-way valve 38° accumulator 44. Cooling is performed through this cycle.

On the other hand, during heating operation, the four-way valve 38 is in an off state (solid line in the figure), the solenoid valve 41 is in a closed state, and the on-off valve 22 repeats opening and closing operations, and combustion in the burner 26 is started.

Here, the liquid refrigerant accumulated in the liquid receiver 23 is transferred to the first check valve 24,
It passes through the gas-liquid separator 25 and is supplied to the refrigerant heater 27 from the suction pipe 28. The refrigerant heated by the burner 26 in the refrigerant heater 27 passes through the gas-liquid separator 25 from the outlet pipe 29, only the gas refrigerant passes through the heating pipe line 39, passes through the fourth check valve 40, the four-way valve 38, and then enters the refrigerant pipe line. 19 to the indoor heat exchanger 43 where it is condensed and liquefied. If the on-off valve 22 is in the closed state at this time, the condensed and liquefied refrigerant is transferred to the refrigerant pipe 20. Return pipe 33
．． The liquid refrigerant flows into the liquid receiver 23 through the second check valve 34, and when the liquid refrigerant is completely stored in the liquid receiver 23, the on-off valve 22 is opened, and the refrigerant in the liquid receiver 23 is removed by its own weight and pressure equalization pipe. 30, the refrigerant 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 via the suction pipe 28. When the on-off valve 22 is open, the liquid receiver 2
No condensed liquid refrigerant flows into 3.

By repeating the above operations, liquid refrigerant is intermittently supplied to the refrigerant heater 27, and gas refrigerant is pressure-fed to the indoor heat exchanger 43.

On the other hand, during heating operation and when the indoor room thermostat 47 is turned on and off, the control mechanism 46
It is determined whether the temperature of the indoor room thermostat 47 has reached the off set temperature, and if it has reached the off setting temperature, the combustion of the burner 26 is turned off, and the initial temperature Ta of the refrigerant heater 27 is determined by the temperature detector 45.
+ is detected. After that, the current temperature T of the refrigerant heater 27 is again
Detect a, Ta.

Calculate the temperature difference ΔTa between and Tat. After calculating ΔTa, the current temperature Ta is replaced with the initial temperature Ta+, and it is determined whether the temperature of the indoor room thermostat 47 has reached the ON set temperature.

If the current temperature Ta has not been reached, the process starts by detecting the current temperature Ta, calculating ΔTa, replacing Ta with Tal, and determining whether the room thermometer 47 is turned on.

Conversely, if the temperature of the room thermometer 47 has reached the ON set temperature, it is determined whether ΔTa increases or decreases. If ΔTa is O
If it is an increase (+), the on-off valve 22 performs an opening/closing operation, ignites the burner 26, heats the refrigerant in the refrigerant heater 27, and enters normal heating operation.

Conversely, if ΔTa decreases (-), the refrigerant in the refrigerant heater 27 is low, so the on-off valve 22 and solenoid valve 41 are first opened, the compression 1136 is driven, and the liquid receiver 23 and refrigerant heater Open/close valve 22.1tm valve 41° outdoor heat exchanger 42. Four-way valve 38. It is sucked into the compressor 36 via the accumulator 44. The refrigerant sucked into the compressor 36 passes through the third check valve 37. It passes through the four-way valve 38 and is discharged to the indoor heat exchanger 43. When the refrigerant in the liquid receiver 23 is removed, the liquid refrigerant accumulated in the indoor heat exchanger 43 is removed from the refrigerant pipe 20. Return pipe 33. It passes through the second check valve 34, flows into the receiver 23, and also enters the refrigerant heater 27. Also, refrigerant piping 20. Return pipe 3
If there is a gas refrigerant in the liquid receiver 23. Refrigerant heater 2
7 to compression 41136.

A timer is counted at the same time as the compressor 36 is driven, and when the timer has elapsed for a certain period of time, the on-off valve 22.
i! The magnetic valve 41 closes, the refrigerant accumulated in the outdoor heat exchanger 42 is pumped up, and later, when the timer reaches the set time, the compressor 3
6 stops. After the compressor 36 is stopped, the on-off valve 22 performs an opening/closing operation, the burner 26 is ignited, the refrigerant is heated by the refrigerant heater 27, and normal heating operation begins. In this way, it is calculated whether the temperature difference ΔTa of the refrigerant heater 27 increases or decreases after the heating stops, and the presence or absence of refrigerant in the refrigerant heater 27 is determined, and the on-off valve 22tm valve 41. It is determined whether the compressor 36 is operating or not. This guarantees reliable heating start-up when frequent heating is turned on and off, such as when the indoor room thermostat 46 is turned on and off, and reduces the drive time and number of times the compression 1136 is turned on and off, reducing operating costs and ensuring reliability of the compressor 36. can.

Effects of the Invention As described above, according to the air conditioning system of the present invention, the temperature of the refrigerant heater is constantly monitored from the time heating is stopped, and if the temperature is low or stable, the compressor is not operated when heating is restarted. The burner is ignited to heat the refrigerant and heating operation begins. Conversely, if the temperature of the refrigerant heater rises, the compressor is driven for a certain period of time before the refrigerant is heated by the burner, and the refrigerant in the receiver and refrigerant heater is controlled by the on-off valve.

After being pushed out to the indoor heat exchanger via the solenoid valve, outdoor heat exchanger, four-way valve, and accumulator, the burner ignition starts heating again. Above system 4B41! By providing a side wall, it is possible to ensure heating start-up even when heating is frequently turned on and off, to minimize the driving time of the compressor, and to minimize the number of times the compressor is turned on and off, thereby reducing operating costs and ensuring reliability of the compressor.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a refrigerant circuit of a heating and cooling apparatus according to an embodiment of the present invention, FIG. 2 is a control flowchart of the same control mechanism, and FIG. 3 is a block diagram of a refrigerant circuit of a conventional heating and cooling apparatus. 21... Heat transfer heating block, 22...
・Opening/closing valve, 23...Liquid receiver, 24...
First check valve, 25... Gas-liquid separator, 26...
...Burner, 27...Refrigerant heater, 34...
...Second check valve, 35...Pressure reduction mechanism, 36
...Compressor, 37...Third check valve, 3
8...Four-way valve, 41...1 is a magnetic valve, 4
2...Outdoor heat exchanger, 43...Indoor heat exchanger, 44...Akinimureta, 45...
...Temperature detector, 46...Control mechanism.

Claims (1)

[Claims] A heat transfer block consisting of an on-off valve, a liquid receiver, a first check valve, a gas-liquid separator, a burner, a refrigerant heater, a second check valve, and a pressure reduction mechanism provided in parallel with the second check valve; The solenoid valve, outdoor heat exchanger, four-way valve, compressor, accumulator, third check valve, and indoor heat exchanger are connected in sequence through a refrigerant pipe, and if the temperature of the refrigerant heater rises after the heating stops, the heating starts. When restarting, the compressor is operated for a certain period of time to push the refrigerant in the liquid receiver and refrigerant heater to the indoor heat exchanger via the on-off valve, solenoid valve, outdoor heat exchanger, four-way valve, and accumulator. A heating and cooling system equipped with a control mechanism.