JPH0783483A - Separate type air conditioner - Google Patents

Abstract

PURPOSE:To prevent breakdown of a compressor by stopping the compressor when the temperature of an indoor heat exchanger detected by a temperature sensor does not meet a prescribed condition after the operation of an air conditioner is started. CONSTITUTION:When the operation of an air conditioner is started, a timer 21 starts counting, and when a prescribed time set for the timer 21 beforehand passes, the timer 21 outputs a command to a protecting means 22. According to this command, the protecting means 22 compares the temperature of an indoor heat exchanger inputted from a temperature sensor 23 with a set temperature inputted from a setting means 22. Then, a compressor 1 is stopped when the temperature of the indoor heat exchanger is lower than the set temperature at the time of a heating operation and when the temperature of the indoor heat exchanger is higher than the set temperature at the time of a cooling operation. According to this constitution, the breakdown of the compressor 1 due to a mistake in an operation or others can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a separation type air conditioner.

[0002]

2. Description of the Related Art A refrigerant circuit diagram of a conventional separation type air conditioner is shown in FIG. During the heating operation of the air conditioner, the high-temperature and high-pressure gas refrigerant discharged from the compressor 1 of the outdoor unit 16 has a four-way valve 2, a gas-side operation valve 3, a connecting gas pipe 4, and a pipe as shown by a solid arrow. It enters the indoor heat exchanger 6 of the indoor unit 17 through the joint 5 and radiates heat to the indoor air sent by the indoor fan 19 to be condensed and liquefied into a high-pressure liquid refrigerant. The liquid refrigerant is adiabatically expanded by being throttled by the throttling mechanism 7 to become a low-pressure liquid gas two-phase refrigerant.

This liquid gas two-phase refrigerant is connected to a pipe joint 9, a connecting liquid pipe.
After passing through 10, the liquid side operation valve 11 and the check valve 12 to enter the outdoor heat exchanger 14, heat is absorbed from the outside air sent by the outdoor fan 15 to be evaporated and vaporized into a low pressure gas refrigerant. Then, this gas refrigerant is sucked into the compressor 1 via the four-way valve 2 and the accumulator 18.

On the other hand, during the cooling operation, the gas refrigerant discharged from the compressor 1 passes through the four-way valve 2 and is condensed in the outdoor heat exchanger 14 to become a high-pressure liquid refrigerant, as shown by a dashed arrow, and the throttle mechanism 13 It becomes a low-pressure liquid gas two-phase refrigerant by being throttled by. Then, the liquid-gas two-phase refrigerant passes through the liquid-side operation valve 11, the connecting liquid pipe 10, the pipe joint 9, and the check valve 8 to evaporate in the indoor heat exchanger 6 to become a low-pressure gas refrigerant. This gas refrigerant returns to the compressor 1 through the pipe joint 5, the connecting gas pipe 4, the gas side operation valve 3, the four-way valve 2 and the accumulator 18.

The outdoor unit 16 of this separation type air conditioner is shipped from the factory with the required refrigerant sealed in the refrigerant circuit and the liquid side operation valve 11 and the gas side operation valve 3 closed, and an indoor unit 17 is provided. Is shipped from the factory with the connecting gas pipe 4 and the connecting liquid pipe 10 connected thereto.

The outdoor unit 16 and the outdoor unit 17 are installed at predetermined places, and then the connecting liquid pipe 10 is connected to the liquid side operation valve 11
And the connection gas pipe 4 is connected to the gas side operation valve 3.
Next, after slightly loosening the flare nut for connecting the connecting gas pipe 4 to the gas side operation valve 3, the liquid side operation valve 11 is opened.

Then, the refrigerant enclosed in the refrigerant circuit of the outdoor unit 16 passes through the connecting liquid pipe 10 and the indoor unit 17
Of the connecting liquid pipe 10 and the air in the refrigerant circuit of the indoor unit 17 through the connecting gas pipe 4 to the outside through the loose flare nut gap of the gas side operation valve 3. Extruded. When a small amount of refrigerant leaks from the gap of the flare nut, the flare nut is tightened and the gas side operation valve 3 is fully opened, whereby the installation work of the separation type air conditioner is completed.

[0008]

In the above-described conventional air conditioner, if the air conditioner is operated without opening one or both of the liquid side operation valve 11 and the gas side operation valve 3 due to a construction error or the like, if the air conditioner is operated, compression will occur. There was a risk that the machine 1 would be overloaded and damaged.

[0009]

The present invention has been invented to solve the above-mentioned problems, and the gist of the first invention is to provide an indoor unit having at least an indoor heat exchanger, At least an outdoor heat exchanger, a compressor, and an outdoor unit equipped with an operation valve for pipe connection are connected through a connecting pipe, in a separation type air conditioner, after the start of operation, provided in the indoor heat exchanger When the detection state by the temperature sensor does not meet the preset conditions,
A separate type air conditioner comprising a protection means for stopping the compressor.

The above condition may be a case where the detected value does not change more than the set value even after a certain period of time.

The above condition may be a case where the detected value rises above a set temperature difference or falls below a set temperature difference.

The above condition can be set when the falling speed or the rising speed of the detected value is faster than the set value.

[0013]

In the present invention, after the start of operation of the air conditioner,
When the detection state of the indoor heat exchanger temperature by the temperature sensor does not satisfy the preset condition, the compressor stops.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention is shown in FIGS. 1 to 3, wherein FIG. 1 is a control block diagram, FIG. 2 is a control flow chart, and FIG. 3 is a temperature change of an indoor heat exchanger. It is a diagram. The refrigerant circuit of the air conditioner is the same as the conventional one shown in FIG.

When there is no abnormality in this air conditioner, when the operation is started, the temperature of the indoor heat exchanger 6 changes with the passage of time during heating operation, as shown by the curve a in FIG. During the cooling operation, the temperature of the indoor heat exchanger 6 changes as shown by the curve B.

However, if both the gas-side operation valve 3 and the liquid-side operation valve 11 are forgotten to be opened due to a mistake in installation work, etc., the refrigerant does not circulate in the indoor heat exchanger 6, so the temperature of the indoor heat exchanger 6 is almost zero. It does not change. Therefore, the temperature of the indoor heat exchanger 6 changes as shown by the curve C during the heating operation, and changes as shown by the curve D during the cooling operation.

As shown in FIGS. 1 and 2, the operation switch
When the operation of the air conditioner is started by turning on 20, the timer 21 starts counting, and when a predetermined time t ₁ preset in the timer 21 has elapsed, the timer 21 outputs a command to the protection means 22. To do.

When this command is input, the protection means 22 compares the temperature of the indoor heat exchanger 6 input from the temperature sensor 23 with the set temperature input from the setting means 24. During the heating operation, the temperature of the indoor heat exchanger 6 is set to the set temperature T.
When it is lower than ₁ , and when the temperature of the indoor heat exchanger 6 is higher than the set temperature T ₂ during the cooling operation, the compressor 1 is instructed and stopped.

Thus, the gas side operation valve 3 and the liquid side operation valve
It is possible to prevent damage to the compressor 1 due to continuing operation of the air conditioner without forgetting to open 11.

When only the gas-side control valve 3 is left open due to a construction error or the like, the temperature of the indoor heat exchanger 6 changes as shown by the curve E during heating operation, and during cooling operation as shown in FIG. Since it changes as shown in the curve, the timer
The predetermined time t ₂ is set in 21 and the temperature difference T ₃ for heating and the temperature difference T ₄ for cooling are set and set in the setting means 24.

After starting the heating operation of the air conditioner, a predetermined time t
_{When 2 has} passed, the temperature of the indoor heat exchanger 6 is set to the set temperature difference T.
_{When the} temperature drops below ₃ and after the start of cooling operation, a predetermined time t
_{When 2 has} passed, the temperature of the indoor heat exchanger 6 becomes a set temperature difference T ₄
When the temperature rises above, the compressor 1 is stopped to prevent damage to the compressor 1. Other configurations and operations are first
It is similar to the embodiment of.

When the air conditioner is relocated, the gas side operation valve 3 is opened and the liquid side operation valve 11 is closed so that the refrigerant is placed in the outdoor unit 16.
Collect in. In this case, as shown in FIG. 5, the temperature of the indoor heat exchanger 6 changes during heating operation as indicated by the curve G and during cooling operation as indicated by the curve E, so that the timer 21 is set to the predetermined time t. ₃ is set, and the change rate ΔT ₅ for heating and the change rate ΔT ₆ for cooling are set and set in the setting means 24. The predetermined time t ₃ is selected to be a time necessary and sufficient for recovering the refrigerant, for example, 45 to 60 seconds.

When a predetermined time t ₃ has elapsed after the start of the operation of the air conditioner, the rate of change of the temperature of the indoor heat exchanger 6 during heating operation, that is, the rate of temperature rise is faster than the rate of change ΔT ₅ for heating. Also, during the cooling operation, if the rate of decrease of the temperature of the indoor heat exchanger ₆ is faster than the cooling change rate ΔT ₆ , the compressor 1 is stopped. Other configurations and operations are similar to those of the first embodiment.

In this way, the refrigerant can be sufficiently recovered and the compressor 1 can be prevented from being damaged due to the excessive refrigerant recovery operation time.

[0025]

According to the present invention, since the compressor is stopped when the detected state of the indoor heat exchanger temperature by the temperature sensor does not satisfy the preset condition after the operation of the air conditioner is started, the compressor of the air conditioner is stopped. It is possible to prevent damage to the compressor due to construction mistakes, operation mistakes, etc.

If the detected value does not change beyond the set value even after a certain time has passed under the above conditions, damage to the compressor due to forgetting to open the gas side operation valve and the liquid side operation valve can be prevented.

When the above condition is set such that the detected value rises above the set temperature difference or falls below the set temperature difference, damage to the compressor due to forgetting to open the gas side operation valve can be prevented.

Assuming that the above condition is that the falling speed or the rising speed of the detected value is faster than the set value, the compressor depends on continuing the refrigerant recovery operation with the gas side operation valve opened and the liquid side operation valve closed. It can prevent damage.

[Brief description of drawings]

FIG. 1 is a control block diagram of a first embodiment of the present invention.

FIG. 2 is a control flowchart of the above embodiment.

FIG. 3 is a diagram showing a temporal change in temperature of the indoor heat exchanger of the above embodiment.

FIG. 4 is a diagram showing a temporal change in temperature of the indoor heat exchanger according to the second embodiment of the present invention.

FIG. 5 is a diagram showing a temporal change in temperature of an indoor heat exchanger according to a third embodiment of the present invention.

FIG. 6 is a refrigerant circuit diagram of a conventional separation type air conditioner.

Claims (4)

[Claims] 1. Separated air obtained by connecting an indoor unit having at least an indoor heat exchanger and an outdoor unit having at least an outdoor heat exchanger, a compressor and a pipe connecting operation valve through a connecting pipe. In the harmony machine, after the start of operation, when the detection state by the temperature sensor provided in the indoor heat exchanger does not satisfy a preset condition, it is provided with a protection means for stopping the compressor. Separate air conditioner. 2. The separation type air conditioner according to claim 1, wherein the detected value does not change more than a set value even after a certain period of time passes under the condition. 3. The separation type air conditioner according to claim 1, wherein the condition is a case where the detected value rises above a set temperature difference or falls below a set temperature difference. 4. The separation type air conditioner according to claim 1, wherein the condition is that the falling speed or the rising speed of the detected value is faster than a set value.