JP3287260B2 - Refrigeration apparatus and refrigerant charging method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigeration apparatus and a method for charging the refrigerant, and more particularly to charging a refrigerant circuit with a non-azeotropic refrigerant mixture.

[0002]

2. Description of the Related Art Conventionally, in a refrigeration system using a single refrigerant such as R22, filling of a refrigerant circuit into a refrigerant circuit is performed, for example, by referring to the "New Edition / Fourth Edition Refrigeration and Air Conditioning Handbook (Basic Edition)" edited by Japan Refrigeration Association As described on page 704 to page 705, the following was carried out.

[0003] First, a refrigerant cylinder is connected via a tube to a refrigerant charging valve of a refrigerant circuit which has been previously evacuated. Then, by opening the refrigerant charging valve, the refrigerant in the refrigerant cylinder flows into the refrigerant circuit due to the pressure difference between the refrigerant cylinder and the refrigerant circuit.

[0004] As the refrigerant is filled in the refrigerant circuit, the pressure of the refrigerant in the refrigerant circuit increases. for that reason,
The pressure difference between the inside of the refrigerant cylinder and the inside of the refrigerant circuit gradually decreases, and the charging speed of the refrigerant decreases. In particular, when the temperature of the air outside the room where the refrigerant cylinder is placed, that is, the outside air temperature is low, the pressure inside the refrigerant cylinder decreases, so that the pressure difference tends to decrease.

Therefore, the amount of refrigerant charged in the refrigerant circuit per unit time decreases. Then, the filling speed of the refrigerant becomes extremely slow. That is, although the pressure in the refrigerant cylinder is higher than the pressure in the refrigerant circuit, the refrigerant is substantially not substantially filled.

When such a situation occurs, the following measures are generally taken to increase the filling speed of the refrigerant.

That is, a refrigerant cylinder is connected to a valve on a suction side pipe of the compressor, and the refrigerant is supplied while the compressor is operated. By doing so, a large pressure difference between the refrigerant cylinder and the inside of the refrigerant cylinder can be ensured, and the charging speed of the refrigerant can be increased. However, in this case, if the liquid refrigerant is sucked into the compressor, the compressor may be damaged. Therefore, only the gas refrigerant must be supplied from the refrigerant cylinder. Therefore, for example, by setting the refrigerant cylinder upright so that the gas refrigerant is located in the upper part of the refrigerant cylinder and setting the gas refrigerant main valve upward, only the gas refrigerant is supplied, and the liquid refrigerant is supplied. Was prevented from flowing into the suction side piping.

[0008]

However, in recent years, in view of global environmental problems, use of non-azeotropic mixed refrigerants such as R407C has been promoted as alternative refrigerants. Non-azeotropic refrigerant mixture is
Due to the difference in the boiling point of each refrigerant, there is a characteristic that the composition ratio of the refrigerant is different between the case in the gas state and the case in the liquid state.

Usually, the composition of the non-azeotropic refrigerant mixture is adjusted in a liquid state, and the refrigerant is filled in a refrigerant cylinder. Therefore, when the refrigerant circuit is charged in a gas state as described above, there is a problem that the composition ratio of each refrigerant differs. That is, when charged in a gaseous state, the mixed refrigerant in the refrigerant cylinder and the mixed refrigerant charged in the refrigerant circuit have different composition ratios and have different properties. Therefore, when the refrigerant is charged with the gas refrigerant, the mixed refrigerant in the refrigerant circuit cannot exhibit the designed performance, and the performance of the refrigerating device such as the air conditioner is significantly reduced.

Therefore, for the non-azeotropic refrigerant mixture,
The conventional charging method of supplying the gas refrigerant from the suction pipe during the operation of the compressor cannot be used. For this reason, since the filling had to be performed while the compressor was stopped, much time was required for the filling.

The present invention has been made in view of the above points, and an object of the present invention is to quickly fill a non-azeotropic refrigerant mixture without changing its properties.

[0012]

In order to achieve the above object, the present invention provides a refrigerant charging section (10) on the downstream side of an expansion valve (4) far from the suction side of a compressor (1). Provided, expansion valve (4)
The pressure of the refrigerant is reduced to reduce the pressure of the refrigerant charging portion (10), and the pressure difference between the refrigerant supply source (12) and the refrigerant charging portion (10) is sufficiently secured. did. Alternatively, a refrigerant charging passage (16) provided with a vaporizing means (17) is provided in the suction side pipe (15), and the liquid refrigerant is vaporized, and then the suction side pipe (1) is provided.
5).

Specifically, the invention according to claim 1 includes a compressor (1), a heat source side heat exchanger (3), a pressure reducing mechanism (4, 6), and a use side heat exchanger (7). In a refrigeration system including a refrigerant circuit (50) configured to be sequentially connected by a pipe (9), a refrigerant circuit is provided between the pressure reducing mechanism (4, 6) and the use-side heat exchanger (7).
A refrigerant charging section (10) connected to the refrigerant supply source (12) when charging the refrigerant into the (50) is provided, and the refrigerant charging section (10) and the refrigerant charging section (10) are used.
A liquid receiver (5) is provided between the water side heat exchanger (7).
The configuration is as follows.

According to the above-mentioned invention, the pressure reducing mechanism (4, 6)
The refrigerant flowing from the heat exchanger (7) toward the use side heat exchanger (7) is decompressed by the decompression mechanism (4, 6), so that the refrigerant
The pressure of the portion becomes lower than the pressure in the refrigerant supply source (12).
Then, the refrigerant in the refrigerant supply source (12) is quickly charged due to a large pressure difference between the refrigerant supply source (12) and the refrigerant charging portion (10). At this time, since the refrigerant charging section (10) is provided at a position far from the compressor (1) in the refrigerant circuit (50), even when the liquid refrigerant is charged, the liquid refrigerant is directly compressed. It is not inhaled by the machine (1). Therefore, the compressor (1) is prevented from being damaged by the liquid compression.

According to the invention , the liquid refrigerant flowing from the refrigerant charging section (10) into the refrigerant circuit (50) is supplied to the receiver.
Temporarily housed in (5). Therefore, the refrigerant filling section (10)
Even if a large amount of liquid refrigerant flows from the compressor, a large amount of liquid refrigerant is not directly sucked into the compressor (1). Therefore, the compressor
The risk of breakage of (1) is further reduced.

According to a second aspect of the present invention, in the refrigeration apparatus according to the first aspect, the pressure reducing mechanism comprises a heat source side expansion valve (4) and a use side expansion valve (6), and is provided with a compressor (1). The discharged high-pressure refrigerant is condensed in the heat source side heat exchanger (3), and the use side expansion valve
Decompress in (6), evaporate in the use side heat exchanger (7) and compressor (1)
Cooling operation that controls the opening of the usage-side expansion valve (6) so that it is sucked into the compressor, and high-pressure refrigerant discharged from the compressor (1) condenses in the heat-source-side heat exchanger (3), and the heat-source-side expansion valve The opening degree of the heat source side expansion valve (4) is controlled so that the pressure is reduced in (4) and becomes lower than the refrigerant pressure in the refrigerant supply source (12), and the liquid refrigerant of the refrigerant supply source (12) is charged with the refrigerant. An operation switching means (11) for switching between the refrigerant charging operation sucked from the section (10) and the refrigerant charging operation is provided.

According to the above-mentioned invention specific matter, at the time of charging the refrigerant,
The operation switching means (11) includes a heat source side expansion valve (4) and a use side expansion valve.
By controlling the opening degree of (6), a large pressure difference between the inside of the coolant supply source (12) and the portion of the coolant filling section (10) is ensured, and the coolant in the coolant supply source (12) is quickly filled. You.

According to a third aspect of the present invention, there is provided a refrigerant charging method for charging a refrigerant in a refrigerant circuit (50) of a refrigeration apparatus according to the first aspect, wherein a refrigerant supply source (12) is provided in a refrigerant charging section (10). ), The step of starting the compressor (1), and the high-pressure refrigerant discharged from the compressor (1) and passed through the heat-source-side heat exchanger (3),
The pressure is reduced by the pressure reducing mechanism including the expansion valve (4), and the refrigerant supply source (1
2) adjusting the degree of opening of the expansion valve (4) so that the pressure becomes lower than the pressure of the refrigerant inside.

According to the present invention, the refrigerant supply source (12)
The pressure difference between the refrigerant and the refrigerant charging section (10) is large, and the refrigerant in the refrigerant supply source (12) is quickly charged.

According to a fourth aspect of the present invention, in the refrigerating apparatus according to the first aspect, the refrigerant is a non-azeotropic mixed refrigerant.

According to the above-mentioned invention, the non-azeotropic mixed refrigerant is charged into the refrigerant circuit in a liquid state, so that the composition thereof does not change at the time of charging. Therefore, the effect of the present invention of filling the refrigerant in a liquid state is more effectively exhibited.

[0022]

Embodiments of the present invention will be described below with reference to the drawings.

-Configuration of Air Conditioner (100)-The air conditioner (100) of the embodiment has a refrigerant circuit (50) as shown in FIG. The refrigerant circuit (50) is a compressor
(1), four-way switching valve (2), outdoor heat exchanger as heat source side heat exchanger (3), outdoor electronic expansion valve as heat source side expansion valve
(4), liquid receiver (5), indoor-side electronic expansion valve (6, 6, ...) as a use-side expansion valve, indoor-side heat exchanger as a use-side heat exchanger
, And an accumulator (8) are sequentially connected by a refrigerant pipe (9). Compressor (1), four-way switching valve (2), outdoor heat exchanger (3), outdoor electronic expansion valve (4),
The receiver (5) and the accumulator (8) are connected to the outdoor unit (U
It is stored in 1). A plurality of indoor-side electronic expansion valves (6, 6, ...) and indoor-side heat exchangers (7, 7, ...) are provided in parallel with each other, and each is housed in the indoor unit (U2).

In this embodiment, the refrigerant pipe between the outdoor electronic expansion valve (4) and the liquid receiver (5) is provided with a refrigerant charging valve (10) as a refrigerant charging section. . Further, a controller (11) for controlling the opening degree of the outdoor-side electronic expansion valve (4) and the indoor-side electronic expansion valve (6, 6,...) Is provided.

—Method of Filling Refrigerant of Air Conditioner (100) — A method of filling the refrigerant into the refrigerant circuit (50) of the air conditioner (100) will be described. In the present embodiment, the refrigerant charged into the refrigerant circuit (50) is R407C, which is a non-azeotropic mixed refrigerant.

First, prior to charging the refrigerant, the refrigerant circuit (50) is evacuated in advance to make the refrigerant circuit (50) vacuum.

Next, as shown in FIG. 1, a refrigerant cylinder (12), which is a refrigerant supply source filled with R407C, is connected to a main valve (13).
It is installed at an angle so that it is located below. By doing so, the liquid refrigerant is located at the lower part in the refrigerant cylinder (12), so that only the liquid refrigerant is present near the main valve (13) of the refrigerant cylinder (12). . A refrigerant hose (14) having one end connected to the main valve (13) of the refrigerant cylinder (12)
Is connected to the refrigerant charging valve (10) in an airtight manner. On this occasion,
To prevent air from entering the refrigerant circuit (50),
Perform the air purge of 4).

Then, the main valve (13) and the refrigerant charging valve (10) of the refrigerant cylinder (12) are opened. As a result, due to the pressure difference between the refrigerant cylinder (12) and the refrigerant circuit (50), the refrigerant in the refrigerant cylinder (12) passes through the refrigerant charging valve (10) and flows into the refrigerant circuit (50). In this way, the refrigerant circuit (50) is filled with a certain amount of refrigerant until the pressure difference becomes small.

After the pressure difference is reduced and the mass of the refrigerant charged per unit time, that is, the charging speed of the refrigerant is reduced, the compressor (1) is started and the following refrigerant charging is performed. Driving.

That is, by the command of the controller (11), the indoor electronic expansion valves (6, 6,...) Are set to slightly open or fully open, and the outdoor electronic expansion valve (4) is set to the outdoor electronic expansion valve.
The refrigerant pressure on the downstream side of (4), that is, on the indoor side, is
2) It is set to be slightly squeezed so as to be smaller than the pressure in 2). In such a state, the refrigerant flows into the refrigerant circuit (51).
Is circulated as follows.

The refrigerant discharged from the compressor (1) passes through the four-way switching valve (2) and condenses in the outdoor heat exchanger (3). The condensed refrigerant is reduced in pressure in the outdoor electronic expansion valve (4), and becomes a low-pressure refrigerant lower than the pressure in the refrigerant cylinder (12).

Therefore, the refrigerant charging valve (1) in the refrigerant circuit (50)
0), that is, the pressure of the refrigerant charging valve (10) is lower than the pressure in the refrigerant cylinder (12), and the pressure between the refrigerant cylinder (12) and the refrigerant charging valve (10) is lower. The pressure difference increases. As a result, this pressure difference causes the refrigerant cylinder (12)
The refrigerant inside flows into the refrigerant circuit (50).

Then, the refrigerant flowing from the inside of the refrigerant cylinder (12) merges with the refrigerant depressurized by the outdoor electronic expansion valve (4). The joined refrigerant flows into the liquid receiver (5), and a part of the liquid refrigerant stays. This prevents a large amount of liquid refrigerant flowing from the refrigerant cylinder (12) from flowing into the suction-side pipe (15) of the compressor (1).

The refrigerant in the liquid receiver (5) is supplied to each indoor unit (U
, U2,...), Passes through the indoor-side electronic expansion valves (6, 6,...), And flows into the indoor-side heat exchangers (7, 7,...). After the refrigerant evaporates in the indoor heat exchanger (7,7, ...), the four-way switching valve
It is sucked into the compressor (1) through (2) and the accumulator (8).

As described above, the refrigerant is supplied to the refrigerant charging valve (10).
The liquid is quickly charged into the refrigerant circuit (50) in the liquid state. After that, by measuring the capacity of the air conditioner (100), etc., it was confirmed that a predetermined amount of refrigerant was filled,
The filling operation ends.

-Cooling operation- In the present air conditioner (100), the controller (11) adjusts the opening degree of the outdoor electronic expansion valve (4) and the indoor electronic expansion valves (6, 6, ...). The above-mentioned refrigerant charging operation and the following cooling operation are switched. Next, the cooling operation will be described.

In the cooling operation, the outdoor electronic expansion valve
(4) is set to fully open, while the indoor electronic expansion valve (6, 6,
) Are controlled so that the outlet superheat or the compressor suction superheat of the indoor heat exchanger (7, 7,...) Has a predetermined value according to the indoor cooling load.

After passing through the four-way switching valve (2), the refrigerant discharged from the compressor (1) exchanges heat with outdoor air in the outdoor heat exchanger (3) and condenses. The condensed refrigerant passes through the outdoor-side electronic expansion valve (4), the refrigerant filling valve (10), and the liquid receiver (5), and is then diverted to each indoor unit (U2). 6,6, ...) are decompressed and expanded. The depressurized refrigerant exchanges heat with indoor air in the indoor heat exchangers (7, 7,...) And evaporates. At this time, the room air is cooled. The evaporated refrigerant passes through the four-way switching valve (2) and the accumulator (8), and is then sucked into the compressor (1).

-Effects of Air Conditioner (100)-In the air conditioner (100), a refrigerant charging valve (10) is provided downstream of the outdoor electronic expansion valve (4). During the refrigerant charging operation, the outdoor electronic expansion valve (4) is throttled to reduce the pressure of the refrigerant charging valve (10). Therefore, the pressure difference between the refrigerant cylinder (12) and the refrigerant charging valve (10) increases, and the refrigerant in the refrigerant cylinder (12) is quickly charged in a liquid state. Also, since the refrigerant is charged in a liquid state, R
The composition ratio of 407C does not change and the air conditioner
(100) can demonstrate the performance as designed.

Since the refrigerant filling valve (10) is provided on the refrigerant circuit at a position far from the suction side of the compressor (1), the liquid refrigerant flowing from the refrigerant cylinder (12) receives the refrigerant (1) as it is. )
There is almost no danger of being sucked into. Further, since the liquid receiver (5) is provided on the downstream side of the refrigerant filling valve (10), even when a large amount of liquid refrigerant flows in from the refrigerant cylinder (12),
Excess liquid refrigerant is stored in the receiver (5), and the liquid refrigerant is supplied to the compressor.
The risk of inhalation in (1) is further reduced. Also, the indoor heat exchangers (7, 7,...) Also serve to store excess liquid refrigerant, similarly to the liquid receiver (5), so that the above risk is further reduced.

Further, since the refrigerant charging valve (10) is provided in the outdoor unit, the work of attaching and detaching the refrigerant cylinder (12) can be easily performed.

As described above, according to this embodiment, the non-azeotropic mixed refrigerant can be quickly and reliably charged without changing the composition ratio.

<Reference Example> The air conditioner (200) of the reference example shown in FIG. 2 is a device in which a liquid refrigerant is gasified and then filled from a suction side pipe (15) of a compressor (1).

-Configuration of the air conditioner (200)-The basic configuration of the refrigerant circuit (51) of the reference example is the same as that of the refrigerant circuit (50) of the embodiment. And a description thereof will be omitted.

In the refrigerant circuit (51), the outdoor electronic expansion valve
No refrigerant charging valve (10) is provided between (4) and the liquid receiver (5), and a refrigerant charging passage (16) is provided in the suction side pipe (15) of the compressor (1).

As shown in FIG. 3, the refrigerant charging passage (16)
It is composed of a capillary tube (17) fitted into a hole (19) for charging the refrigerant provided in the suction side pipe (15), and a joint (18) fixed to the tip of the capillary tube (17). I have. The joint (18) constitutes a connecting means for airtightly connecting the refrigerant cylinder (12) via an on-off valve (not shown) and a refrigerant hose (14). Capillary tube (1
7) constitutes vaporizing means for expanding and vaporizing the liquid refrigerant flowing from the refrigerant cylinder (12).

-Method of Filling Refrigerant of Air Conditioner (200)-A method of filling refrigerant of the air conditioner (200) will be described. First,
As in the embodiment, after the inside of the refrigerant circuit (51) is evacuated, a predetermined amount of refrigerant is charged while the compressor (1) is stopped. Then, when the pressure difference between the inside of the refrigerant cylinder (12) and the inside of the refrigerant circuit (51) decreases, the present air conditioner (200) performs the following refrigerant charging operation.

First, as in the embodiment, the compressor (1) is started, and the refrigerant is circulated in the refrigerant circuit (51). At this time,
The pressure inside the suction pipe (15) becomes low. Then, the refrigerant cylinder (1
2) Open the main valve (13) and the on-off valve (not shown) connected to the joint (18).

Due to the pressure difference between the refrigerant cylinder (12) and the suction side pipe (15), the refrigerant in the refrigerant cylinder (12) is cooled by a refrigerant hose.
The liquid flows into the capillary tube (17) through (14). When passing through the capillary tube (17), the liquid refrigerant is reduced in pressure and expanded to become a gas refrigerant. That is,
Vaporize. Then, the gas refrigerant merges with the gas refrigerant flowing through the suction-side pipe (15), and is sucked into the compressor (1).

Thus, the refrigerant is quickly charged into the refrigerant circuit (50) without changing the composition in the liquid state. Thereafter, it is confirmed that a predetermined amount of the refrigerant has been charged, for example, by measuring the capacity of the air conditioner (200), and the charging operation is terminated.

-Effect of Air Conditioner (200)-In the air conditioner (200), the liquid refrigerant is vaporized by the capillary tube (17) and then flows into the suction side pipe (15). Therefore, the liquid refrigerant is not sucked into the compressor (1), and the risk of damage to the compressor (1) due to liquid compression or the like is significantly reduced.

In particular, when the refrigerant circuit (51) is large-scale, merely providing the accumulator (8) in the suction pipe (15) cannot store all the refrigerant amount in the accumulator (8). It is not possible to eliminate the risk of sucking the liquid refrigerant into the compressor (1). Conversely, it is not practical to prepare an accumulator that can store all the amount of refrigerant in terms of cost and space. Therefore, simply providing an accumulator (8) is not enough.
By providing the refrigerant charging passage (16) as in the present embodiment, it is possible to reliably prevent the liquid refrigerant from being sucked into the compressor (1).

The inside of the suction side pipe (15) has a refrigerant circuit (50).
Among them, the pressure is the lowest, so that the pressure difference between the refrigerant cylinder (12) and the refrigerant cylinder (12) can be maximized. Therefore, the charging speed of the refrigerant is further increased, and the refrigerant can be charged more quickly.

Further, since the refrigerant charging passage (16) is provided in the outdoor unit, the work of attaching and detaching the refrigerant cylinder (12) can be easily performed.

As described above, according to the present embodiment, the non-azeotropic refrigerant mixture can be quickly and reliably charged without changing the composition ratio.

-Modifications- The expansion means is not limited to the capillary tube (17), but may be another expansion means such as an expansion valve, or may heat a refrigerant like a heater. For example, a means for vaporizing the gas may be used.

The refrigerant to be charged is not limited to R407C, but may be another non-azeotropic mixed refrigerant or a pseudo-azeotropic mixed refrigerant.

Further, as described in the above embodiment and the reference example , the present invention is particularly effective at the time of filling a non-azeotropic refrigerant mixture. Of course you can. Therefore, the refrigerant to be charged may be a single refrigerant or the like.

In the above embodiment and the reference example , as a method of supplying the liquid refrigerant, the method of tilting and installing the refrigerant cylinder has been described. However, of course, the supply of the liquid refrigerant may be performed by another method. For example, a so-called siphon-type cylinder may be used to supply the liquid refrigerant with the cylinder standing. In other words, for the liquid refrigerant located at the bottom of the cylinder with the cylinder standing, a straw-shaped hollow rod connected to the main valve extends, and the liquid refrigerant is discharged through the hollow rod using a cylinder. Is also good.

The refrigeration system according to the present invention comprises:
It is not limited to a refrigeration device in a narrow sense, but refers to a refrigeration device in a broad sense including a heat pump type air conditioner, a cooling only machine, a heating only machine, a refrigeration device, and the like.

[0061]

As described above, according to the present invention, the following effects are exhibited.

According to the first aspect of the present invention, the pressure difference between the inside of the coolant supply source and the portion charged with the coolant can be increased by reducing the pressure of the coolant circulating in the coolant circuit by the pressure reducing mechanism. The refrigerant in the supply source can be quickly charged. Since the refrigerant charging section is provided at a position far from the compressor on the refrigerant circuit, it is possible to reduce a risk that the refrigerant flowing in the liquid state from the refrigerant supply source is directly sucked into the compressor in the liquid state. . Therefore, the reliability of the refrigeration system can be improved.

Further, the surplus liquid refrigerant flowing into the refrigerant circuit from the refrigerant charging section can be stored in the receiver. Therefore, even if a large amount of liquid refrigerant flows, a large amount of liquid refrigerant is not sucked into the compressor as it is, and it is possible to further reduce the risk of damage to the compressor. Therefore, the reliability of the refrigeration system can be further improved.

According to the second aspect of the invention, when the refrigerant is charged, the operation switching means controls the opening degree of the heat source side expansion valve and the utilization side expansion valve, so that the pressure between the inside of the refrigerant supply source and the refrigerant charging portion is controlled. The difference can be easily secured, and the refrigerant in the refrigerant supply source can be quickly and easily charged.

According to the third aspect of the invention, it is possible to ensure a large pressure difference between the refrigerant supply source and the refrigerant charging section, and to quickly fill the refrigerant in the refrigerant supply source. In addition, since the refrigerant is charged from the refrigerant charging portion located far from the compressor, even if the refrigerant is charged in a liquid state, there is little danger of being sucked into the compressor in a liquid state. Therefore, the refrigerant can be charged in a liquid state.

According to the fourth aspect of the present invention, since the non-azeotropic refrigerant mixture can be charged in a liquid state, its composition does not change at the time of charging. Therefore, it is possible to quickly charge the non-azeotropic refrigerant mixture without changing its properties.

[Brief description of the drawings]

FIG. 1 is a refrigerant circuit diagram of an air conditioner.

FIG. 2 is a refrigerant circuit diagram of the air conditioner.

FIG. 3 is a configuration diagram of a refrigerant charging passage.

[Explanation of symbols]

 (1) Compressor (3) Outdoor heat exchanger (4) Outdoor electronic expansion valve (5) Liquid receiver (6) Indoor electronic expansion valve (7) Indoor heat exchanger (10) Refrigerant filling valve ( 12) Refrigerant cylinder (13) Main valve (14) Refrigerant hose (15) Suction side piping (16) Refrigerant charging passage (17) Capillary tube (18) Joint

Continuation of the front page (72) Inventor Makoto Furuta 1304 Kanaokacho, Sakai City, Osaka Daikin Industries, Ltd. Sakai Works Kanaoka Factory (56) References JP-A-8-210736 (JP, A) JP-A-8-210 200899 (JP, A) JP-A-8-200897 (JP, A) JP-A-8-313120 (JP, A) Japanese Utility Model Application Sho 51-72952 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F25B 45/00 F25B 1/00 395 F25B 13/00

Claims (4)

(57) [Claims] A compressor (1), a heat source side heat exchanger (3), a pressure reducing mechanism (4, 6), and a use side heat exchanger (7) are connected in order by a pipe (9). In the refrigerating apparatus including the refrigerant circuit (50), the refrigerant supply between the pressure reducing mechanism (4, 6) and the use-side heat exchanger (7) when the refrigerant is charged into the refrigerant circuit (50). A refrigerant charging section (10) connected to the source (12) is provided, and between the refrigerant charging section (10) and the use side heat exchanger (7),
A refrigeration apparatus comprising a liquid receiver (5) . 2. The refrigeration apparatus according to claim 1, wherein the pressure reducing mechanism includes a heat source side expansion valve (4) and a utilization side expansion valve (6), and the high pressure refrigerant discharged from the compressor (1) is used as a heat source. Side heat exchanger (3)
And decompressed by the use side expansion valve (6).
Use side expansion valve so that it evaporates in (7) and is sucked into compressor (1)
Cooling operation to control the opening of (6), and high-pressure refrigerant discharged from the compressor (1) to the heat source side heat exchanger (3)
And the pressure is reduced by the heat source side expansion valve (4) and the refrigerant supply source (12).
The heat source side expansion valve (4) so that the pressure becomes lower than the refrigerant pressure in the inside.
The liquid refrigerant of the refrigerant supply source (12) is
A refrigeration system comprising an operation switching means (11) for switching between a refrigerant charging operation sucked from (10) and a refrigerant charging operation. 3. The refrigerant circuit (5) of the refrigeration apparatus according to claim 1,
0) a refrigerant charging method for charging a refrigerant, wherein a step of connecting a refrigerant supply source (12) to a refrigerant charging section (10), a step of starting the compressor (1), The high-pressure refrigerant discharged and passed through the heat-source-side heat exchanger (3) is decompressed by a decompression mechanism including an expansion valve (4) so that the pressure becomes lower than the refrigerant pressure in the refrigerant supply source (12). (4) A method of charging a refrigerant, the method comprising: adjusting the opening degree. 4. The refrigeration apparatus according to claim 1, wherein the refrigerant is a non-azeotropic mixed refrigerant.