JPS5914700B2 - Multi-room air conditioner - Google Patents

Description

Detailed Description of the Invention The present invention relates to a so-called multi-room air conditioner in which a plurality of indoor units are connected to one outdoor unit. One of its purposes is to enable heating operation.

In a conventional multi-room air conditioner, when the indoor unit is in heating operation with the compressor running,
When adding another indoor unit for heating operation, the gas-side solenoid valve and source-side solenoid valve that control the flow of refrigerant to the indoor heat exchanger of the indoor unit that is being operated for additional heating are opened at the same time. .

However, the indoor heat exchanger of the indoor unit subjected to this additional heating operation stopped the flow of refrigerant by closing the gas side solenoid valve and the source side solenoid valve before heating operation, and the low pressure The pressure was at a low level, almost the same as the suction pressure of the compressor.

Therefore, if the gas-side solenoid valve and the source-side solenoid valve are opened simultaneously, high-pressure gas will flow into the low-pressure indoor heat exchanger at high speed, and this flowing refrigerant may generate a loud impact noise or cause the gas-side solenoid valve to open. By rapidly moving the pilot valve, a clicking sound may be generated.

These impact noises and lunchbox noises are amplified by the indoor unit, creating a major problem in that they generate large noises and vibrations from the floors and walls to which the indoor unit is attached.

Further, these drawbacks similarly occur even when only the source-side solenoid valve is opened in the same state.

The present invention is intended to eliminate the above-mentioned drawbacks, and one embodiment thereof will be described below with reference to the drawings.

FIG. 1 is a refrigeration cycle diagram of an embodiment of a multi-room air conditioner according to the present invention, in which an outdoor unit 1 includes a pole conversion type compressor 2. Discharge muffler 3. Four-way valve 4% heat source side heat exchanger5. Liquid main pipe6. A source side branch pipe γa formed by branching the liquid side main pipe 6 at a branch point 13;
7b, 7c, and the same number of gas side branch pipes 8a, 7b, and 7c as the source side branch pipes 7a, 7b, and 7c.

Gas side main pipe 9 made by collecting 8b and 8c. Accumulator 10. A heating throttle mechanism 11 provided in the source side main pipe 6, and a check valve 12 provided in parallel with the heating throttle mechanism 11 to block the flow of refrigerant during heating operation. Heating throttle mechanism 11 of source side main pipe 6 and source side branch pipes 7a, 7b, 7c
A liquid receiver 14 provided between the branch part 13 and the branch part 13. Each source side branch pipe 7
Bidirectional aperture mechanism 22a in as 7 b x7c
, 22b.

Bidirectional flow solenoid valves 15a, 1 provided in series with 22c.
5b, 15c, each electromagnetic valve 15a, 15b.

15c and the connection ports 16a, 16b, 16c, and bypass pipes 23, 24. Bi-directional bypass solenoid valves 25, 26, which are provided in the bypass pipes 23, 24. A check valve 17a is provided in a direction that allows refrigerant to flow toward the low pressure circuit 20 during heating operation.

The electromagnetic valves 15a, 15b are formed by connecting the throttles 17b, 17c in series with the throttles 18a, 18b, 18c, respectively.

Source side branch pipe 7a between connection ports 16a, 16b, 16c between 15c and each indoor unit 30a, 30b, 30c
Bypass pipes 19a, 19b, 19C connecting t7b, 7c and the low pressure circuit 20 during heating operation, gas side branch pipe 8a
It consists of bidirectional flowable solenoid valves 21a, 21b, and 21c provided in tab and 8c, respectively.

Note that the outdoor unit 1 includes a blower that blows air from the heat source side heat exchanger 5VC.

Also indoor unit) 30a, 30b. 30c are user-side heat exchangers 31a and 31b, respectively.

31c and each user side heat exchanger 31a, 31b.

It consists of an indoor blower that sends the air heat exchanged at 31c into the room.

FIG. 2 shows an embodiment of the electric circuit of the multi-room air conditioner according to the present invention, in which the coil 5Vja of the solenoid valve 15a and the solenoid valve 21
The circuit in which the coil 5VGa of a and the relay contact 46a are connected in series and the electromagnetic switch MRa are each an indoor unit)
The circuit connected in parallel to the power supply 45 via the operation switch 40a of 30a, and the circuit in which the coil 5VLb of the solenoid valve 15b, the coil 5VGb of the solenoid valve 21b, and the relay contact 46b are connected in series, and the solenoid switch MRb are each indoor units. The coil 5VLo of the solenoid valve 15c is connected in parallel to the power supply 45 via the operation switch 40b of the solenoid valve 15c.
and the coil 5vGo of the solenoid valve 21c and the relay contact 46c.
The circuit in which these are connected in series and the electromagnetic switch MR are each connected in parallel to the power source 45 via the operation switch 40c of the indoor unit 30c.

In addition, the 2-pole and 4-pole motor MC2 of the pole conversion type compressor 2
, MC, are connected in series with the relay contacts 47, 49, respectively, and are connected in parallel to the power source 45 via a circuit S in which the normally open contacts MR and MRbssMRos of the electromagnetic switches MRa, MJ, , MR, are connected in parallel. , and the coils Va, b and ■ of the bypass valves 25 and 26 connected in parallel.
The circuit consists of the relay 43 and the coil 41 of the four-way valve 4 connected in series with b~0.

The operation switch 40a is connected in parallel to the power supply 45 through the heating side contacts 48 of the cooling/heating changeover switch 42, and is composed of a microcomputer or the like.

A control device 44 that detects ON, OFF, etc. of 40b and 40c and controls relay contacts 43, 46a, 46b, 46c, and 47° 49 is connected to a power source 45, respectively.

Here, the operation of the multi-room air conditioner according to the present invention in the above configuration during heating operation will be explained.

Now, with the cooling/heating selector switch 42 set to the heating side contact 48 side, the operation switch 40 of the indoor unit 30a
Assuming that a is turned on, the control device 44 consisting of a microcomputer, etc., recognizes that the indoor unit 30a has issued the first signal to rotate the motor MC4 of the pole change type compressor 2, which had been stopped. To detect.

Accordingly, a voltage is applied to the coil 5Voa of the solenoid valve 15a through the coil 5VLa of the solenoid valve 21a, the solenoid switch MRa, and the relay contact 46a which is closed by the action of the control device 44, and the solenoid valves 15a and 21a are activated. At the same time, open the normally open contact MRa8 of the electromagnetic switch MRa, close the relay contact 49, and rotate the 4-pole motor MC4 of the pole converter compressor 2.

At this time, as mentioned earlier, the control device 44 is an indoor unit)
Motor MC of pole change type compressor 2 where 30a was stopped
Since it is detected that the first control signal for rotating the relay contact 43 has been issued, the normally open contact of the relay contact 43 is kept open, and the bypass solenoid valves 25 and 26 are
The coils Va, b, vb, and C are not energized.

Since the coil 41 of the four-way valve 4 is energized in this way, the refrigerant gas discharged from the pole change type compressor 2 passes through the four-way valve 4 and the gas side main pipe 9. The gas side branch pipe 8ab passes through the solenoid valve 21a and reaches the indoor heat exchanger 31a of the indoor unit) 30a, where it radiates heat and liquefies, and is further expanded to the connection port 16a, the solenoid valve 15a, the source side branch pipe 7a, and the throttle device 22a1, the branch point 13. It passes through the receiver 14, is depressurized by the heating throttle mechanism 11, passes through the low pressure circuit 20 during heating operation, evaporates in the heat source side heat exchanger 5, passes through the four-way valve 4 again, passes through the accumulator 10, and changes the number of poles. Returning to the mold compressor 2, a refrigeration cycle is formed, and the indoor unit 30a performs heating operation.

In addition. In this case, it goes without saying that the outdoor blower and the indoor blower in the indoor unit 30a are operating.

Also, when this indoor unit) 30a is in heating operation, the other indoor units) 30b and 30c are operated with operation switches 40b and 40c.
Because the contacts of the solenoid valves 15b, 21b, and 15c are open, heating operation is not performed.

21c coil 5VLb, 5Vob, 5VLo, SVo
.

The solenoid valves 15a and 21b are not energized.

15c and 21c close the passage.

Therefore, the refrigeration circuit 32 that is closed by the solenoid valves 21b and 15b and includes the indoor heat exchanger 31b, and the refrigeration circuit 32c that is closed by the solenoid valves 21c and 15c and includes the indoor heat exchanger 31c are in a state in which no refrigerant flows. It is in.

However, in reality, the solenoid valves 21a, 21b, 21c, 15a
.

15b, 15c, etc. cannot completely stop the flow of refrigerant and there is some leakage, so indoor units 30b, 30 that are stopped
The refrigerant gradually accumulates inside the indoor heat exchangers 31b and 31c.

However, a large amount of refrigerant accumulates in the indoor heat exchangers 31b and 31c (and the amount of refrigerant flowing through the indoor heat exchanger 31a of the indoor unit 30a during operation decreases, causing a decrease in heating capacity and the compressor The problem arises that it may mimic the horizontal rule of 2.

Therefore, indoor heat exchangers 31c and 3
The refrigerant accumulated in Ib is extracted.

Therefore, the indoor heat exchangers 31b of the indoor units 30b, 30c are stopped.

The refrigerant pressure in 31c is in the same low pressure state as in the low pressure circuit 20 during heating operation.

Under these circumstances, when additionally operating another indoor unit 30b, the conventional control method
5b was open at the same time, so the indoor heat exchanger 3 was at low pressure.
Because high-pressure refrigerant gas flows into Ib at high speed due to the pressure difference, large refrigerant impact noises, vibrations, and intense valve punching noises of the solenoid valve 21b were generated.

Therefore, in the case of the present invention, as shown in the valve operation timing chart in FIG.
When b is turned on, the control device 44 consisting of a microcomputer or the like will turn on the operation switch 40b while the 4-pole motor MC4 of the pole change type compressor 2 is in operation since the operation switch 40a has already been turned on. detects that the relay contact 46b is open, closes the normally open contact of the relay contact 43, and closes the bypass solenoid valve 25.
26 coils V, ~b, V b, , o When a voltage is applied, the refrigeration circuit 32a, in which high-pressure liquid flows, and the refrigeration circuits 32b, 32c, which have been stopped and have been at low pressure, are connected to the bypass pipe 23. 24, and the pressure in the refrigeration circuits 32b and 32c gradually increases as the liquid refrigerant enters.

Here, since the refrigerant flowing into the refrigeration circuit 32b through the bypass pipe 24 is in liquid form, the inflow speed is slow and no impact noise or the like is generated.

In addition, the coils SVa~b, SVb~0 of the solenoid valves 25 and 26
At the same time as energizing.

Liquid solenoid valve 1 for additionally operated indoor unit) 30b
Since the coil 5VLb of 5b is also energized.

The high-pressure liquid refrigerant in the source main pipe 6 also flows into the indoor heat exchanger 31b through the refrigeration circuit 32b.

Therefore, the pressure inside the indoor heat exchanger 3ib can be rapidly increased.

Therefore, the pressure inside the indoor heat exchanger 3Ib can be rapidly increased without generating impact noise.

In this way, the pressure inside the refrigeration circuits 32b and 32c increases to a certain extent, and when the solenoid valve 21b is opened, the indoor heat exchanger 31b
When it is thought that there is no significant pressure difference between the refrigerant pressure and the refrigerant pressure flowing into the refrigerant, the control device 44 opens the relay contact 43 (
When the normally closed contact of relay 46b is closed, the indoor unit) 3
Solenoid valve 21b in refrigeration circuit 32b that supplies refrigerant to 0b
The coil 5VGb is energized and the passage of the solenoid valve 21b is opened.

Therefore, the refrigerant flowing through the electromagnetic valve 21b enters the refrigeration circuit 32b with a small pressure difference, so that no impact noise or vibration is generated.

Further, since the solenoid valve 21b does not suddenly open the lunch box 9, the valve will not be damaged.

Bypass solenoid valve 25 provided in this refrigeration circuit.
26, since it is not known which indoor unit is being operated and which indoor unit will be additionally operated, 1. For example, in the bypass pipe 24, from the refrigeration circuit 32a side to the refrigeration circuit 3
2b side, or sometimes from the refrigeration circuit 32b side to the refrigeration circuit 3
Since it may flow to the 2a side, it is necessary to use a solenoid valve with bidirectional flow capability.

The above explanation is based on the control device 4 when the operation switch 40b is turned on.
4 changes the motor of the compressor 2 from 4 pole MC4 to 2 pole M
This is a case where the signal for switching to C2 is not issued, that is, when the load condition is sufficiently covered by the capacity of the four-pole motor MC4.

On the other hand, when the operation switch 40b of the indoor unit 30b is turned on while the indoor unit) 30a is in operation, the load detected by the control device 44 is large, so the control device 440 uses a control signal to switch the pole change type compressor 2 to high capacity. That is, when it becomes necessary to operate with two poles, the pole number converting type compressor 2 is temporarily stopped.

This is the solenoid valve for the indoor unit 30b, which increases the pressure on the high pressure side (increases when the pole number converter compressor 2 instantly switches from 4-pole operation to 2-pole operation, so the indoor unit is additionally operated at this time). 1
5b and the bypass solenoid valves 25 and 26, the refrigerant in the source main pipe 6 and in the refrigeration circuit 32a, which has increased in pressure, is guided into the refrigeration circuit 32b in a low pressure state. The pressure difference between the circuit 32a and the refrigeration circuit 32b is the same as the pressure inside the refrigeration circuit 32a when the solenoid valve 15b and the bypass solenoid valves 25 and 26 are opened while the pole converter compressor 2 is still operating at 4 poles. This is because the pressure difference between the refrigeration circuit 32b and the inside of the refrigeration circuit 32b is much greater than the pressure difference between the refrigeration circuit 32b and the solenoid valve 15b and the bypass solenoid valves 25 and 26.

Further, in this embodiment, only two bypass pipes 23 and 24 are provided, but if necessary, refrigeration circuits 32b and 32c may be used.
A third bypass pipe may be provided to connect the two, and a bidirectional solenoid valve may be interposed in this bypass pipe.

Also, the positions of the bypass pipes are the solenoid valves i5a and 15b.

The liquid branch pipes 7a, 7b, and 7c between 15c and the connection ports 16a, 16b, and 16c are connected to each other.

Solenoid valves 15a, 15b, 15c and bypass solenoid valve 25
．． When the flow resistance of 26 is small, the diaphragm 9 devices 22a, 2
2b, 22c and solenoid valves 15a, 15b.

It goes without saying that the same effect can be expected even if the liquid branch pipes 7a, 7b, and 7c are tied between the tubes 15c.

Furthermore, in this embodiment, when operating the indoor unit 30c while the indoor unit 30a is operating, the bypass solenoid valve 25.
It is necessary to open both of 26, but indoor unit) 30
When operating the indoor unit 30b during operation a, the electric circuit may be configured such that only the bypass solenoid valve 25 is opened.

Furthermore, in the electric circuit of FIG. 2, the operation switch 40a
, 40b, 40c are installed in series, and other indoor units are operating and pole number conversion type compression operation is in progress. If the same control is performed when the operation switch is turned on and the temperature regulator returns, the problem will be completely eliminated. Needless to say, similar effects can be obtained.

Furthermore, the opening time of the bypass solenoid valves 25, 26 may be calculated and determined each time by a microcomputer, taking various conditions into consideration.

That is, the various conditions include various factors such as the number of units in the operating room, thermostat temperature, and thermostat OFF time.

Alternatively, the bypass solenoid valve may be controlled by a pressure switch or the like.

As described above, the multi-chamber air conditioner according to the present invention is as follows.

When the pole change type compressor is running and the load is small (when one indoor unit is in heating operation and the other indoor unit is in additional heating operation or restarted by thermostat etc., the load is small and the pole number change type compressor is running) If there is no need to change the number of poles, bypass the source branch pipe on the indoor unit side of the throttle device.

In addition, the source side solenoid valve of the additional heating operation room is opened to increase the pressure in the indoor heat exchanger of the indoor unit that has been inactive, and then the gas side solenoid valve is opened, so that the gas side solenoid valve is opened. It allows for quiet heating operation that does not produce refrigerant impact noise or vibrations, and it also eliminates the occurrence of severe gas side solenoid valve bending, which extends the life of the gas side solenoid valve, and allows for the addition of other indoor units. When the motor speed of the pole change type compressor is changed (especially when speeding up) when returning to operation due to heating operation or thermostat, etc., the pole number change type compressor is temporarily stopped, so it is not necessary to add or restore it. This has great effects such as not generating large refrigerant noise even if the source side solenoid valve or bypass solenoid valve of the room is opened.

[Brief explanation of the drawing]

Fig. 1 is a refrigeration cycle diagram of an embodiment of the multi-chamber air conditioner according to the present invention, Fig. 2 is an electric circuit diagram of an embodiment of the multi-chamber air conditioner, and Fig. 3 is the operation of the solenoid valve. It is a timing chart figure. 1...Outdoor unit, 7a, 7b, 7c...
... Source side branch pipe, 15a, 15b, 15c"" solenoid valve. 19a, 19b, 19c... Bypass pipe (liquid drain pipe), 21 a, 2 l b, 21 c"・
·solenoid valve. 22a, 22b, 22c"" Squeezing device, 23, 2416
．． 50. Bypass pipe, 25, 26. -9-Bypass solenoid valve, 30a, 30b, 30c...Indoor unit, 44...Control device, 43.46a, 46
b, 46c=...Relay contact, MC...Compressor motor. SVI, a, 5VLb, 5VL (""" Solenoid valve 15a,
15b. 15c coil, 5VGa, 5VGb, 5Voo...
... Coils of solenoid valves 21a, 21b, 21c, va-
b... Coil of solenoid valve 25, ■...
... Coil of solenoid valve b ” = c 26.

Claims (1)

[Claims] In a multi-room air conditioner in which a plurality of indoor units are connected to 11 outdoor units by connection piping, a pole change type compressor is provided, and the source side main pipe of the outdoor unit is connected to the indoor unit. A source side solenoid valve is installed in each source side branch pipe created by branching into a number of units. Each of the source side branch pipes between each of the source side solenoid valves and each of the indoor heat exchangers of the plurality of indoor units is connected by at least a number of bypass pipes that can communicate with each other, and the bypass pipes are A bypass solenoid valve is installed in the
A gas side solenoid valve is provided in each of the gas side branch pipes created by branching the gas side main pipe to the number of indoor units, and further between each of the source side solenoid valves and each of the indoor heat exchangers of each of the indoor units. A drain pipe is connected from each of the source side branch pipes to a pipe line that has low pressure during heating operation, and when one or more indoor units is in heating operation, other indoor units can be restarted or restarted using a temperature controller, etc. When additional heating operation is performed, at the same time, if the load condition is not within the range for pole number change of the pole change type compressor, the source side electromagnetic in the source side branch pipe connected to the other indoor unit At the same time as the valve is opened, another source-side branch pipe that connects at least one source-side branch pipe supplying refrigerant to the certain indoor unit in the heating operation and the other indoor unit in which the temperature controller is restored or the additional heating operation is performed. (After the bypass solenoid valve is opened for a certain period of time, the gas side solenoid valve in the gas side branch pipe connected to the front distribution indoor unit is opened, and one or more indoor units is in heating operation.) When a return operation or additional heating operation is performed on another indoor unit using a temperature controller, etc., if there is a request to change the number of poles of the above-mentioned pole-changeable compressor at the same time, one set of the above-mentioned pole-number-changeable compressor is A multi-room air conditioner that can be stopped.