JPH0350376Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a refrigeration system that connects one outdoor unit and a plurality of indoor units with inter-unit piping.

(b) Conventional technology As a refrigeration system in which multiple indoor units are connected to one outdoor unit with inter-unit piping, the
54607 has been disclosed.

According to this content, a valve and a service valve connected to the inter-unit piping are disposed in a branch pipe provided in the outdoor unit and which diverts refrigerant to each indoor unit.

In such a refrigeration system, when performing an air purge to exhaust the air inside the indoor unit, the valves are closed and cylinders are connected to the respective service valves, so that the refrigerant in the cylinders is allowed to flow from the service valves to the indoor unit.

(c) Problems to be solved by the invention As described above, a cylinder had to be prepared during air purge, making the air purge work cumbersome.

The purpose of the present invention is to easily perform air purging of a refrigeration system in which a plurality of indoor units are connected to one outdoor unit.

(d) Means for Solving the Problems In order to achieve this object, the present invention provides a branch pipe that is provided in the outdoor unit and diverts the refrigerant to the respective indoor units, so that the branch pipes are opened and stopped when the respective indoor units are operated. A container that is located on the outflow side of this valve and stores refrigerant for air purge of the indoor unit, and a service valve that is located on the outflow side of this container and is connected to the inter-unit piping. Bypassing this, the container and the outdoor heat exchanger are connected through auxiliary piping, and this piping is provided with a valve that opens during air purging.

(e) Function The refrigeration system of the present invention allows the refrigerant stored in the outdoor heat exchanger to flow into the container through the auxiliary piping when air purging the indoor unit, making it easier for the refrigerant stored in the container to flow to the indoor unit. It is something.

(f) Example In the drawings, 1 is an outdoor unit, 20, 50
are first and second indoor units, and these units are connected by inter-unit piping 21, 22, 51, 52. and the first and second indoor units 20,
Either one or both of the 50 can be operated at the same time.

The outdoor unit 1 includes a compressor 2, an outdoor heat exchanger 3 acting as a condenser, a main capillary tube 4, and an accumulator 5 connected to the suction side of the compressor 2. A branch pipe 6 is connected to the outflow side of the main capillary tube 4.
Reference numerals 23 and 53 indicate first and second capillary tubes disposed in the branch pipe 6, and reference numerals 24 and 54 indicate first and second solenoid valves connected to the outflow sides of the first and second capillary tubes 23 and 53. It is controlled to open when energized and close when not energized. It closes when the outdoor unit 1 is shipped from the factory and when the first and second indoor units 20 and 50 stop operating, and is closed when the units are in operation. 25,55 is the first,
A refrigerant reservoir connected to the outflow side of the second electromagnetic valve 24, 54, 26, 56 is a refrigerant inflow pipe, and the reservoir 2
5, 55 and extends downward from above. 27,5
Reference numeral 7 denotes a refrigerant outflow pipe, which is connected to the bottom walls of the reservoirs 25 and 55.

7 is an auxiliary pipe, one end 8 is connected to the outflow side pipe 9 of the main capillary tube 4, and the other end 28, 58
are connected to the upper part of the reservoirs 25 and 55, respectively. A third capillary tube 10 and a third solenoid valve 11 are arranged in this auxiliary pipe 7. This third solenoid valve 11 is controlled to close when energized and open when not energized. This third solenoid valve 1
The coil that operates compressor 1 is connected in parallel with the motor of compressor 2. The third solenoid valve 11 is opened when the outdoor unit 1 is shipped from the factory and when the first and second indoor units 20 and 50 are stopped (when the compressor 2 is stopped), and when these units are in operation (the compressor (during operation 2).

Reference numerals 29 and 59 indicate service valves (hereinafter referred to as "first and second two-way valves") located on the outflow side of the reservoirs 25 and 55. 30 and 60 are first and second three-way valves connected to the inflow side of the accumulator 5.

41 and 61 are indoor heat exchangers built into the first and second indoor heat exchange units 20 and 50, respectively;
It acts as an evaporator.

When injecting refrigerant into these devices and inspecting each device in the factory during the manufacture of this refrigeration system, the inter-unit piping 21, 51, 22, 52
After connecting each unit, refrigerant is injected from the service port 31 of the three-way valve 30 while the compressor 2 is operating. After injecting a predetermined amount of refrigerant into this device, first, the two-way valves 29 and 59 are closed, and after a certain period of time, the three-way valves 30 and 60 are closed to drain the refrigerant flowing into the indoor units 20 and 50 into the outdoor unit 1. Collect to. Next, the compressor 2 is stopped, the first and second solenoid valves 24 and 54 are closed, and the third solenoid valve 11 is opened. Therefore, even if there is a difference between the pressure of the refrigerant in the outdoor heat exchanger 3 and the pressure of the refrigerant in the storage containers 25, 55, the pressure of the refrigerant becomes approximately uniform through the third solenoid valve 11, and the pressure of the refrigerant in the storage container 25, 55 becomes approximately uniform. The containers 25 and 55 are filled with the amount of refrigerant necessary for air purging of the indoor units 20 and 50, respectively.

When installing each unit and connecting these units with piping, first connect the two-way valves 29, 59 of the outdoor unit 1 and the first and second indoor units 2.
Connect the connecting ports 32, 62 of one of the units 0, 50 with one of the inter-unit piping 21, 51, and also connect the three-way valve 30, 60 of the outdoor unit 1 with the other connection port of the The connection ports 33 and 63 are connected by the other inter-unit piping 22 and 52.

Thereafter, during an air purge to remove the air in the first indoor unit 20, the three-way valve 30 is operated so that the service port 31 of the three-way valve 30 and the other inter-unit piping 22 are in communication, and the two-way valve 29 is opened. In this way, the refrigerant in the reservoir 25 flows through the inter-unit piping 21 on one side to the indoor heat exchanger 41 and the inter-unit piping 22 on the other side, is discharged from the service port 31 of the three-way valve 30, and is discharged from the service port 31 of the three-way valve 30. Air inside the indoor unit 20 is removed. At this time, an outdoor heat exchanger 3 is connected to the reservoir 25 via an auxiliary pipe 7.
The refrigerant in the reservoir 25 is quickly sent to the first indoor unit 20. Further, when air purging the second indoor unit 50, the same operation as described above may be performed.

When the first and second indoor units 20 and 50 are in operation, the third solenoid valve 11 is closed and the first and second solenoid valves 24 and 54 are opened, respectively. At this time, since the refrigerant once flows into the reservoir 25, 55, the refrigerant sound generated when passing through the capillary tubes 4, 23, 53 and the solenoid valves 24, 54 is
55, making it difficult for the signal to be transmitted to the indoor units 20, 50.

Further, when the operation of either indoor unit 20, 50 is stopped, the third solenoid valve 11 is opened. Therefore, the pressure of the refrigerant in the refrigerant pipe is quickly balanced.

(g) Effects of the device As detailed above, the present invention provides a valve that is closed when the indoor unit is stopped in the branch pipe of the outdoor unit, and a service valve that is connected to the inter-unit piping, and connects the indoor unit between the two. Since a container was provided to store refrigerant for air purge of the unit, air purge can be performed by closing the valve and opening the service valve. Therefore, this work can be easily performed without using conventional cylinders. or,
A valve is installed on the inflow side of the container that stores the refrigerant, so
This container can soften the refrigerant noise generated when the refrigerant passes through the valve, making it difficult for this refrigerant noise to be transmitted to the indoor unit.

Also, connect the container and the outdoor heat exchanger with piping,
During air purge, the refrigerant from this outdoor heat exchanger is poured into this container, so the refrigerant stored in this container is quickly sent to the indoor unit.
Air purge can be performed reliably. Furthermore,
The valve provided in this piping was kept open after the outdoor unit was manufactured, so a pressure difference was created between the pressure of the refrigerant in the outdoor heat exchanger and the pressure of the refrigerant in the container during manufacture. However, this pressure difference can be eliminated through this valve, and the amount of refrigerant required for air purge can be stored in the container.

[Brief explanation of the drawing]

The drawing is a refrigerant circuit diagram showing an embodiment of the refrigeration system of the present invention. 1...Outdoor unit, 3...Outdoor heat exchanger, 6
... Branch pipe, 11, 24, 54 ... Solenoid valve, 2
0,50...indoor unit, 21,22,51,
52... Inter-unit piping, 25, 55... Reservoir.

Claims (1)

[Scope of utility model registration request] One outdoor unit equipped with an outdoor heat exchanger,
In a refrigeration system that connects multiple indoor units with inter-unit piping, the outdoor unit is provided with a branch pipe that diverts the refrigerant to each indoor unit.
The branch pipe has a valve that is opened when each indoor unit is in operation and closed when it is stopped, a container located on the outflow side of this valve that stores refrigerant for air purge of the indoor unit, and a container that stores refrigerant for air purge of the indoor unit on the outflow side of this container. A refrigeration system comprising: a service valve connected to a pipe; the container and the outdoor heat exchanger are connected by a pipe; and the pipe is provided with a valve that opens during the air purge.