JPS593346Y2 - Pump-down device for multi-room air conditioners - Google Patents

Description

[Detailed description of the invention] The present invention relates to a multi-room air conditioner, and more specifically, to a pump-down device that allows one person to easily and reliably operate the pump-down operation on the outdoor unit side. .

In a multi-room air conditioner that uses two or more indoor units (2a, 2b, etc.) connected in parallel to one outdoor unit 1 as shown in Figure 1, once installed, Indoor units) 2a, 2b may be partially or completely relocated during renovation or remodeling, and the outdoor unit 1 installed outdoors may be similarly relocated.
In this case, immediately before disconnecting the piping connections between the outdoor unit 1 and the indoor units 2a and 2b, remove the refrigerant remaining in the indoor unit to be relocated and the connecting liquid pipes and connecting gas pipes to the outdoor unit. Conventional air conditioners of this type are equipped with an electric circuit as shown in Fig. 5, in which a solenoid valve for operation control is inserted in the connecting liquid pipe. 6 a and 6 b, and the compressor 3
When pumping down by energizing the operation switch 1 of one of the indoor units 2a or 2b,
5a or 15b to drive the compressor motor 12, and open the pump-down switch 19 to close the solenoid valves 6a and 6b.
(a, 6b are energized open type solenoid valves), therefore, a total of two people are required: the equipment to operate the operation switch 15a and the person to operate the switch 19 while checking the pressure outdoors. This was not easy to do, and the costs would inevitably increase.

On the other hand, if one person attempts to perform this pump-down operation, he or she will have to check the pressure on the outdoor unit 1 side, then go indoors and operate the operation switch. In other words, when a phenomenon occurs in which the pressure in the pipes on the indoor unit side and in the suction pipes in the outdoor unit drops extremely, and the pipe connections are disconnected, air may be sucked into the outdoor unit 1, which is therefore an undesirable task. I can say that.

In order to deal with such conventional problems, the present invention was developed in an attempt to provide a pump-down device that can fundamentally eliminate the above-mentioned defects, and it is an attempt to provide a pump-down device that can fundamentally eliminate the above-mentioned defects. It is characterized by a configuration in which pump-down operation can be performed by simply operating a pump-down switch provided on the outdoor unit side while the operation switch remains open.

Hereinafter, the specific configuration of the device of the present invention will be described in detail with reference to each side of the accompanying drawings.

FIG. 1 is a piping system diagram of a general multi-room air conditioner, in which an outdoor unit 1 includes a compressor 3. Condenser 4. On the other hand, the indoor unit h2a is constituted by the pressure reduction mechanism 5.

2b is composed of evaporators 11a, 11b and an indoor fan (not shown), respectively.

The pressure reducing mechanism 5 provided in the high pressure liquid pipe 8 of the indoor unit 1 branches the liquid pipe 8 into branch pipes 9 a and 9 b corresponding to the number of indoor units 2 a and 2 b, and each of these branches The tubes 9a, 9b are provided with energized open type solenoid valves 6a, 6b, respectively, and capillary tubes 5-, . 5-2 respectively, and each capillary tube 5-. , 5-2 and each on-off valve 6
A bypass pipe is provided between the branch pipes 9 a and 6 b to connect the branch pipes 9 a and 9 b in parallel, and a capillary tube 5 - 3 is interposed in this bypass pipe.

Reference numerals 7a and 7b refer to check valves respectively interposed in branch gas pipes branched from the suction pipe 10 of the outdoor unit 1, so that the refrigerant gas in the suction pipe 10, which is higher than the atmospheric pressure, is released from the indoor unit. This is a control valve designed to prevent leakage into the atmosphere when connected.

In the air conditioner configured as described above, the indoor units 2a and 2b are controlled to start and stop by opening and closing the solenoid valves 6a and 6b.
Three examples are shown in FIGS. 4 through 4, respectively.

In each of these circuits, 12 is a compressor motor, 13 is an outdoor fan motor, 14 a , 14 b is a fan motor for each of the indoor units 2 a and 2 b (7), 15 a ,
15 b is also the operation switch, 16 a, 16 b
Same as temperature setting thermostat, 17 a, 17
b is an auxiliary relay corresponding to each indoor unit 17a, 17b, each indoor unit 2a, 2b, 6a s, 6b s are electromagnetic coils of solenoid valves 6a, 6b, and 18 is a pump down operation It is a switch for

First, to explain the circuit shown in the second figure, in order to operate at least one of the indoor units 2a and 2b, for example 2a, by turning on the operation switch 15a, the thermostat 16 is closed at a temperature higher than the set temperature. The indoor fan motor 14b is energized via a, and the auxiliary relay 17
a is excited.

Thus, by closing the relay contact 17a, the compressor motor 1
2 and the outdoor fan motor 13 are activated.

At the same time, the electromagnetic coil 6a-6 of the electromagnetic valve 6a is excited and the electromagnetic valve 6a is opened, so that cooling operation is started.

In addition, the solenoid valves 6a and 6b of the air conditioner related to the circuit shown in the second figure
Both are energized open type solenoid valves.

During cooling operation, when the room temperature drops to a predetermined temperature, the thermostat 16a is opened and the indoor fan stops, and the compressor 3 and outdoor fan also stop.

However, in the case of simultaneous operation of two rooms, only the indoor fan of the indoor unit whose room temperature has decreased stops, and the compressor 3, the outdoor fan, and the indoor fans of the other indoor units continue to operate.

Therefore, the pump-down switch 18 is the switch 18 for forced operation of the compressor, and the switch 18 for closing the solenoid valve.
-2, and is provided in the circuit on the outdoor unit 1 side, and the former switch 18-1 is the indoor unit)-
The latter switch 18-2 may be connected in parallel to the series circuit consisting of the operation switch 15a and thermostat H6a of 22 (indoor unit) 2b (indoor unit) 2b and the thermostat 16b). The electromagnetic wire rings 6a-8 and 6b-8 are inserted into the wiring for directly connecting them to the busbar of the control circuit, and both wire rings 6aS and 6bS are connected.
It is arranged so that it is in series relationship with.

The switch 18-1 is a normally open switch that is closed during pump down operation, and the - switch 18-2 is a normally closed switch that is opened in the opposite direction. 2 has an interlocking structure that is mechanically linked.

When the need for pump-down operation arises due to relocation of at least one of the outdoor unit 1 and indoor unit 2a, 2b, switching the switch 18 from the illustrated state causes the switch 18-1 to close. When the switch 18-2 is opened, the compressor 12 is energized via the auxiliary relay 17a, and at the same time, both the solenoid valves 6a and 6b are
is demagnetized and closed, so switch 1 for pump down operation.
It can be easily performed on the outdoor unit side by only the operation 8, regardless of the indoor units 2a and 2b.

Next, the circuit shown in Figure 3 is applied to an air conditioner in which one of the solenoid valves 6 a and 6 b is of the energized closed type, and the other solenoid valve 6 b is of the energized open type. In this circuit, the switch 18-2 for closing the solenoid valve is connected to the normally open switch 18-2a and the normally closed switch 1.
8-2b, and the switch 18 as a whole has a triple structure.

The switch 18-2J1 is connected in parallel to the normally closed contact of the auxiliary relay 17a connected in series to the electromagnetic coil 6a-6, and the switch 18-2b is connected in parallel to the normally closed contact of the auxiliary relay 17a connected in series to the electromagnetic coil 6b-6.
5 is connected in series in the same manner as the circuit shown in the second figure.

Switch 18 can be created by simply making some circuit changes like this.
Pump-down operation can be performed on the outdoor unit 1 side simply by operating .

Further, the circuit shown in the fourth country is an example of a circuit when both the solenoid valves 6 a and 6 b are for energization/closing, and
The switch 18-2 for closing the solenoid valve has a double structure consisting of a normally open switch 1828.18zb,
These are connected in parallel to the normally closed contacts of the corresponding auxiliary relays 17a and 17b, respectively.

In this circuit as well, pump-down operation can be easily performed by simply operating the triple switch 18 on the outdoor unit 1 side.

As described in detail above, the present invention has the operational solenoid valves 6a and 6b.
In a multi-room air conditioner, a manual switch 18-1 forcibly energizes the compressor 3 by a closing operation, and a manual switch 18-1 forcibly closing each solenoid valve 6a, 6b by a closing or opening operation. Manual switch 182 and outdoor unit 1
Because it is configured to be interlocked with the electric circuit of the outdoor unit 1, the pump can be easily and reliably brought down by a simple switch operation by only one worker on the outdoor unit 1 side, compared to the conventional method that required two workers. This can solve the problem of difficulty in performing proper pump down operation when one person is involved.

[Brief explanation of the drawing]

Figure 1 is a piping system diagram of a general multi-room air conditioner, Figures 2 to 4 are electrical circuit diagrams of air conditioners according to each embodiment of the device of the present invention, and Figure 5 is a diagram of a conventional air conditioner. It is an electrical circuit diagram. 1...Outdoor unit), 2a, 2b...
Indoor unit, 3...Compressor, 6a, 6b...
...Solenoid valve, 18-1...Manual switch,
18-2...Manual switch.

Claims (1)

[Scope of utility model registration request] Two or more indoor units) 2a... are connected to one outdoor unit 1, and the operation switch 15a...
. . . and a temperature controller 16a . . . . Each indoor unit) 2a .
In a multi-room air conditioner in which the electric circuit of the outdoor unit 1 that controls the operating solenoid valve 6a of each indoor unit) 2a is interconnected, a manual switch 1 that forcibly energizes the compressor 3 through a configuration operation;
8-1, each of the solenoid valves 6 by closing or opening operation.
Manual switch 18- for forcibly closing a...
2 in the electric circuit of the outdoor unit 1, thereby making it possible to perform pump-down operation only on the outdoor unit 1 side.