JPS6143191Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a multi-room air conditioner that uses a capillary reach tube as a pressure reducing mechanism, and in particular, the pressure balance during stoppage can be quickly achieved with a simple mechanism.
The present invention relates to a multi-room air conditioner that allows smooth restarting of a compressor.

Most multi-room air conditioners are equipped with on-off valves such as solenoid valves in each branch piping line as controllers for starting and stopping each indoor unit, and each on-off valve is closed when the unit is stopped. Therefore, when all the indoor units stop, all on-off valves are closed and the high and low pressure circuits are cut off, and as a result, pressure equalization is no longer performed and the pressure difference remains for a considerable period of time. remains attached.

This condition is undesirable because it leads to overload operation in which the compressor has to be restarted.

Conventionally, compensation has been taken by providing a pressure balancing solenoid valve or using a motor with a large starting torque for the compressor.

However, the former means requires a complicated control circuit, while the latter means is expensive and larger than a general-purpose motor, and both are undesirable because they increase the cost of the device.

In response to the fact that conventional air conditioners of this type have their own drawbacks, the present invention attempts to provide a new multi-room air conditioner that can eliminate these defects with a simple structure. It has been accomplished.

Aspects of the present invention will be explained in detail below with reference to examples shown in the accompanying drawings.

In Fig. 1, 1 is an outdoor unit, 2a, 2b
is an indoor unit, and the outdoor unit 1 includes a compressor 3, a condenser 4, a pressure reducer 5, and an accumulator 6.
On the other hand, indoor units 2a and 2b
are each composed of evaporators 15a, 15b and an indoor fan (not shown).

The liquid flow section of the outdoor unit 1 has on-off valves 7a, 7b such as electromagnetic valves connected to branch liquid pipes 10a, 10b, which are formed by branching the liquid pipe 8 in accordance with the number of indoor units 2a, 2b.
are provided so that each outlet of each solenoid valve 7a, 7b is connected to the liquid pipe in the corresponding indoor unit 2a, 2b, and furthermore, the branch point 9 and the inlet of each solenoid valve 7a, 7b are connected to each other. Capillary reach tubes 5a, 5 as pressure reducers 5 are installed in the branch pipes connecting the
Bypass pipes 14 are provided to connect the low-pressure side liquid pipes, which are branch pipes 10a and 10b, which connect the capillary reach tubes 5a and 5b and the solenoid valves 7a and 7b, respectively, in parallel. It is set up.

On the other hand, a piping 12 via a capillary reach tube 13 is bridged between the bypass pipe 14 and the suction gas pipe 11 constituting a part of the low-pressure gas pipe.

In the cooling system configured as described above, each indoor unit 2a, 2b is operated/stopped by each solenoid valve 7a,
This is done by opening and closing 7b, and both units 2
When a and 2b are stopped, the compressor 3 is stopped by appropriate means.

Even if either indoor unit 2a or 2b is stopped, the solenoid valve 7a related to the other indoor unit
Alternatively, since 7b is open, the cooling operation is continued as a whole, and in this case, the pressure is low after the capillary reach tubes 5a and 5b, and since there is a capillary reach tube 13,
Almost no refrigerant flows through the pipe 12, and loss of capacity is extremely small.

If both indoor units 2a, 2b are stopped at the same time, both electromagnetic valves 7a, 7b are closed, and the compressor 3 is also stopped.

Immediately after the compressor 3 stops, the high pressure line and the low pressure line are cut off, so a considerable pressure difference exists between the two lines.

At this time, the capillary reach tubes 5a, 5b
Since the high-pressure refrigerant in front of the capillary reach tubes 5a, 5b flows in through the capillary reach tubes 5a, 5b, the refrigerant is at high pressure until the subsequent inlets of the electromagnetic valves 7a, 7b. Therefore, since there is a pressure difference between this high-pressure part and the suction gas pipe 12, high-pressure refrigerant flows into the suction gas pipe 12 via the pipe 12, and the high-pressure line and the low-pressure line are automatically connected. A pressure balance between

In this way, when the compressor 3 is restarted, the pressure balance between the high and low pressure lines is maintained, so the startup load becomes extremely small, so the load on the motor of the compressor 3 is small, and smooth startup is achieved. be.

After startup, the pressure immediately after the capillary reach tubes 5a, 5b becomes low, so the pressure balancing action of the piping 12 is completed, and stable cooling operation is achieved.

As described in detail above, the present invention provides a multi-room air conditioner in which the liquid pipe 8 of the outdoor unit 1 is branched into branch pipes 10a and 10b corresponding to the number of indoor units 2a and 2b. Branch pipes 10a, 10
Indoor units 2a, corresponding to b,
On-off valves 7a and 7b, such as electromagnetic valves, which are opened and closed when the indoor units 2b are operated and stopped, and closed when all the indoor units 2a and 2b are stopped, are provided, respectively. Open/close valve 7
Capillary reach tubes 5a, 5b are interposed in each branch pipe 10a, 10b between the capillary reach tubes 5a, 5b and each on-off valve 7.
A bypass pipe 14 is provided to connect the branch pipes 10a and 10b between the bypass pipes 10a and 7b.
4 and a low-pressure gas pipe 11 are connected by a pipe 12 via a capillary reach tube 13. During normal cooling operation, there is almost no pressure difference between both ends of the pipe 12, so that the refrigerant does not flow. Since no refrigerant bypass is performed, the loss of cooling capacity is minimized, and efficient and stable cooling operation is guaranteed. When the compressor 3 is completely stopped, the piping 12 plays a role in pressure balancing, so when the compressor 3 is restarted, there is almost no pressure difference between the discharge port and the suction port of the compressor 3, or even if there is, it is very small. Therefore, the inconvenience of overload startup can be solved.

In addition, the pressure balance mechanism has an extremely simple structure with the piping 12 having the capillary reach tube 13, so there is almost no risk of failure, and the cost increase required for this is minimal. It also has the advantage that it can be applied to other types of air conditioners without problems, and the air conditioner of the present invention has various excellent practical effects.

[Brief explanation of the drawing]

FIG. 1 is a piping system diagram according to one embodiment of the present invention. 1...Outdoor unit, 2a, 2b...Indoor unit, 5...Capillary reach tube, 7a, 7b
... Opening/closing valve, 8 ... Liquid pipe (outdoor side), 9 ... Branch point, 10a, 10b ... Branch pipe, 11 ... Low pressure gas pipe, 12 ... Piping, 13 ... Capillary reach tube, 14 ... ...bypass pipe.

Claims (1)

[Scope of utility model registration request] In a multi-room air conditioner in which a plurality of indoor units 2a, 2b are connected to one outdoor unit 1,
Connect the liquid pipe 8 of the outdoor unit 1 to the indoor unit 2.
Branch pipes 10a,
10b, and an indoor unit 2 corresponding to each branch pipe 10a, 10b for the branch pipes 10a, 10b.
On-off valves 7a and 7b, such as electromagnetic valves, which are opened and closed when the indoor units 2a and 2b are operated and stopped, and closed when all the indoor units 2a and 2b are stopped are provided, respectively, and a branch point 9 of the branch pipes 10a and 10b is provided. and each branch pipe 10a, 10b between each on-off valve 7a, 7b.
Capillary reach tubes 5a, 5b are interposed between the capillary reach tubes 5a, 5b, and bypass pipes 14 are provided to connect the branch tubes 10a, 10b between the capillary reach tubes 5a, 5b and the on-off valves 7a, 7b. A multi-room air conditioner characterized in that a pipe 14 is connected to a low pressure gas pipe 11 by a pipe 12 via a capillary reach tube 13.