JPS6176852A - Separation type air conditioner - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention connects a compressor and condenser provided in an outdoor unit and an evaporator 8 provided in an indoor unit by a connecting pipe. This invention relates to a separate air conditioner with a refrigerant circuit.

[Prior Art] The refrigerant circuit of a conventional separate air conditioner was constructed as shown in FIG. In this figure, an outdoor unit (4) is equipped with a compressed image (1), a condenser (2), and a cupillary tube (3), and an indoor unit (6) is equipped with an evaporator (5). Liquid side communication pipe (7) and gas side communication pipe (
8). And the compressor (1)
The high-temperature, high-pressure refrigerant discharged from the discharge side of the compressor reaches the condenser (2) via the compressor discharge gas pipe (9), where it is cooled by outside air and condensed and liquefied while maintaining high pressure. Capillary tube (3) through liquid outlet tube (10)
leading to. The low-pressure, low-temperature refrigerant liquid that has been depressurized in this capillary tube (3) and partially gasified is transferred to the ventral joint (11).
, the ventral communication pipe (7) and the ventral joint (12), and the evaporator liquid inlet pipe (13) to the evaporator (5). In this evaporator (5), the refrigerant liquid absorbs heat from the indoor air and vaporizes, thereby performing an indoor cooling action. The refrigerant gas vaporized in the evaporator (5) passes through the evaporator gas small pipe (14), the gas side joint (15), the gas side communication pipe (8), and the compressor (1) via the gas side joint (16). ) is sucked into the suction side.

The refrigeration cycle is formed as described above.

[Problems to be Solved by the Invention] In the conventional separated air conditioner shown in FIG. ), the capacity of the evaporator (5), and the correlation with the amount of refrigerant filled in the refrigeration cycle system, and is determined so as to obtain an appropriate cooling capacity. In this way, there is a correlation between the cooling capacity, the shape and dimensions of the capillary tube (3), and the amount of refrigerant charged, so if the ventral connecting tube (7) is made too long when installing a separate air conditioner, the amount of refrigerant charged will be There is a problem in that this increases the cooling capacity, leading to a decrease in cooling capacity and making it difficult to maintain an appropriate cooling capacity.

In addition, if the Ir compressor (1) is a completely hermetically sealed type that is suitable for hanging from the top to prevent refrigerant leaks, if the vent side connecting pipe (7) is lengthened and the amount of refrigerant charged increases, it will be possible for the Ir compressor (1) to leak together with the refrigerant during operation. Circulation V filtration pressure 5
There was a problem in that the lubricating oil in the compressor (1,) became difficult to return to the compressor (1), which could easily cause damage to the compressor (1).5 In order to prevent the above problems, conventional Side connecting pipe (7)
The length was regulated (for example, 15 m or less). Therefore, when the installation distance between the outdoor unit (4) and the indoor unit (6) becomes long, there is a problem that the above-mentioned problem cannot be prevented.

The present invention has been made to solve the above problems, and even if the installation distance between the outdoor unit and the indoor unit becomes long and the ventral communication pipe becomes long, the refrigeration effect will not deteriorate and the cooling effect will be maintained properly. The purpose is to use a separate air conditioner that maintains operation.

[Means for solving the problem] The conventional capillary tube installed in the outdoor unit was eliminated, the inner diameter of the ventral connecting tube was made smaller than before, and a gas-liquid separator was installed downstream of the ventral connecting tube. The liquid reservoir part and the gas reservoir part of this gas-liquid separator are respectively connected to the refrigerant inlet side and the refrigerant outlet side of the evaporator provided in the indoor unit, and the compressor, condenser, vent side A refrigerant circuit is formed by connecting a communication pipe, a gas-liquid separator, and an evaporator in a closed circuit.

[Function] The inner diameter of the ventral communicating tube is smaller than before (for example, half of the conventional one), so even if the length of the ventral communicating tube is doubled, the amount of refrigerant in the ventral communicating tube is only half that of the conventional one. Even if the amount of refrigerant in the gas side communication pipe is taken into account, the total amount of refrigerant charged is smaller than that of the conventional method. In addition, the high-pressure refrigerant liquid output from the condenser is connected to the liquid side with a small inner diameter! By passing through three pipes, the refrigerant changes to medium-pressure refrigerant liquid, and the flash gas generated at this time is separated by a gas-liquid separator and does not pass through the evaporator. Therefore, the pressure loss of the refrigerant in the evaporator is reduced, the evaporation pressure can be kept relatively low, and the ratio of refrigerant liquid to refrigerant gas in the evaporator is increased, so that the heat transfer coefficient is improved. Therefore, the amount of refrigerant circulated through the lip generator is smaller than that of the conventional ffi model by the amount of flash gas, but since this flash gas does not participate in the cooling effect, the refrigerating effect per unit of refrigerant @ ring volume is greater than before. Become.

[Embodiment] FIG. 1 shows an embodiment of the present invention, and the same parts as in FIG. 4 are given the same reference numerals. In Figure 1, (.1) is an outdoor unit, and inside this outdoor unit (4) there is pressure,
A compressor (1) (of a completely hermetic type, for example) (1) and a condenser (2) connected to the discharge side of the compressor (1) via a compressor discharge gas pipe (9) are provided. On the outlet side of the condenser (2), there is a condenser liquid outlet pipe (10), a ventral joint (11), and the inner diameter is smaller (for example, 8 mmφ) than the conventional one (for example, 8 mmφ).
For example, through the ventral connecting pipe (7) with a diameter of 4 mm, and the ventral joint (12), the gas-liquid components provided in the indoor units 1 to (6) are connected to (L jljl (j 7 )). The liquid reservoir (17a) formed at the lower part of the gas-liquid separator (17) is connected to the evaporator (5) through the capillary tube (18) and the evaporator liquid inlet pipe (]3). The gas reservoir (17b) formed at the upper part of the gas separator (17) is connected to the flash gas relief pipe (1).
9) to the output side of the evaporator (5). The outlet side of the evaporator (5) is connected to the evaporator gas small pipe (1).
4) is connected to the suction side of the compressor (1) via a gas side joint (15) and a gas side communication pipe (8), and via a gas side joint (16). In this way, a refrigerant circuit is formed.

Next, the operation of the above embodiment will be explained using FIG. 2.

FIG. 2 shows a refrigeration cycle in which state changes of the refrigerant are plotted on a Mollier diagram. In Figure 2, point a is the compressor (1
) shows the refrigerant gas drawn into the suction side of It becomes gas. The high-temperature, high-pressure refrigerant gas discharged from the discharge side of the compressor (1) reaches the condenser (2) via the compressor discharge gas pipe (9), where it is cooled by outside air and undergoes constant pressure change. It condenses and liquefies, resulting in high pressure as shown at point e (P3
) as a refrigerant liquid. In other words, from point b to point 0, which intersects the dry saturated vapor line ( °C), and at point d, liquefaction completes ',b and when it reaches point 0, ;a degree decreases slightly.The high pressure ( 1]・,) The refrigerant liquid passes through the /1 condenser liquid outlet pipe (10) and oil side joint (1F), and through the ventral side communication pipe (7) and ventral side e, (+2) G-. Medium pressure (P2
) and reaches the gas-liquid separator (17). That is, the ventral communication tube (7) has an inner diameter smaller than that of the conventional one (for example, 8 mmφ).
) is smaller (for example, 4 mmφ) and has a longer length (for example, 20 m) than the conventional one (for example, 10 m), so it does not have a pressure reducing function. For this reason, the ventral communicating canal (7
), the refrigerant liquid changes from high pressure (P3) to intermediate pressure (P2) and flash gas is generated. When such a gas-liquid mixture of refrigerant reaches the gas-liquid separator (17), its flow rate drops rapidly, so that the refrigerant accumulates in the liquid reservoir (17a) as shown at points g and h in Figure 2. Liquid and gas reservoir (+7
b) and the refrigerant gas that accumulates in the refrigerant gas. Gas-liquid separator (1
In 7), the refrigerant liquid shown at the 5g point expands with isentropic change through the capillary tube (18), and the medium pressure (
The refrigerant changes from P2) to low pressure (Pl) and becomes a low-pressure (Pl) low-temperature refrigerant as shown in (1) in the same figure.This low-pressure (P,) low-temperature refrigerant is transferred to the evaporator (5).
At this point, the heat in the room is absorbed and the refrigerant gas is completely vaporized, and the refrigerant gas exiting the evaporator (5) is frozen in the evaporator (5) until it reaches the state shown in Figure 2 (j). The effect q is given by the following equation.

q+=Ij-ri (1) Here, Tj represents the enthalpy at three points, and ■l represents the enthalpy at the i point.

On the other hand, the refrigerant scum separated by the gas-liquid separator (17) changes from medium pressure (P2) to low pressure (Pl) by passing through the flash gas relief pipe (19), as shown in Part 2 (k). The state is such that the gas is guided to the outlet side of the evaporator (5), joins with the refrigerant gas from the ring 93 (5), passes through the evaporator gas small pipe (14) and the gas side joint (15), and the gas Figure 2 (
In the state shown in a), it is sucked into the suction side of the compressor (1), and a refrigeration cycle is constructed.

Moreover, in the 21st m, the dotted line C shows the refrigeration cycle in the conventional example shown in FIG. 4, and its refrigeration effect q2 is
) is given by Here, IQ represents the enthalpy of the refrigerant on the inlet side of the conventional evaporator (5) shown in FIG.

As is clear from Figure 2, since IQ>1i (1
), From equation (2), ql〉C12, and evaporation a:y(s)a unit circulation scene of the refrigerant passing through! The refrigeration effect of 11 indicates that the present invention is greater than the conventional example. In other words, the high-pressure refrigerant liquid output from the I condenser (2) is transferred to the ventral communication pipe (7), which has a smaller inner diameter than before.
The flash gas generated at this time is passed through the gas-liquid separator (17), where it changes into medium-pressure refrigerant.
and does not pass through the evaporator (5). Therefore, the pressure loss of the refrigerant in the evaporator (5) is reduced, the evaporation pressure can be kept relatively low, and the ratio of refrigerant liquid to refrigerant gas in the evaporator (5) increases, so that the heat transfer coefficient will improve.

Therefore, the amount of refrigerant @ring that passes through the evaporator (5) is smaller than the conventional example by the amount of flash gas, but since this flash gas does not participate in the cooling effect, the refrigeration effect per unit circulating amount of refrigerant is greater than that of the conventional example. .

In the above embodiment, the inner diameter of the liquid communication pipe (7) is the conventional (8 m).
mφ) (4 mmφ), but the present invention is not limited to this, and any appropriate size smaller than the conventional one may be used.

In the above embodiment, the gas-liquid separator was provided within the indoor unit, but the present invention is not limited to this, and may be provided near the indoor unit. Furthermore, in the above embodiment,
Although the liquid reservoir of the gas-liquid separator is connected to the inlet side of the evaporator via a capillary tube, the present invention is not limited to this. If so, the outlet of this liquid reservoir may be directly connected to the inlet side of the evaporator. Figure 3 takes into consideration the above points,
It also shows a refrigerant circuit in which switching between the present invention and the conventional example can be performed using a switching section. That is, the first feature is that the gas-liquid separator (17) is provided in the gas-liquid separator (20) provided near the indoor unit (6), and one of the first switching parts (21) The on-off valve <210) is opened and the other on-off valve (21b) is closed,
When one of the 5) closing valves (22a) of the second switching part (22) is opened and the other opening/closing valve (22b) is closed, the 11th
This is a modification of the present invention shown in Figure 1, in which the on-off valves (21a) (21b), (21b), (
If the opening and closing of 22a) and (22b) are as described above, the fourth
The second feature is that it is similar to the conventional example shown in the figure. In FIG. 3, (7a) shows a liquid communication pipe with an inner diameter smaller than the conventional one (for example, 4 mmφ), and (7b) shows a liquid communication pipe with the same inner diameter as the conventional one (e.g., 8 mmφ).
(23) is the gas reservoir part (17) of the gas-liquid separator (17).
b) is a capillary tube inserted between the outlet of the evaporator (5) and the outlet side of the evaporator (5). The first advantage of FIG. 3 is that there is no need to install the gas-liquid separator (17) inside the indoor unit (6), so the indoor unit (6) can be made smaller and thinner. The second advantage is that in installation locations where the distance 1v between the outdoor unit (4) and the indoor unit (6) is short (for example, 15 m or less), the first and second switching parts (21) (22) A conventional refrigerant circuit using a liquid communication pipe (7b) with a large inner diameter is used, and in installation locations where the distance between the outdoor unit (4) and the indoor unit (6) is long (for example, 15 m or more), the first and second refrigerant circuits are used. Switching part (
21) By (22), a small internal diameter liquid communication pipe (7
) can be used as the refrigerant circuit of the present invention.

[Effects of the Invention] As described above, the present invention eliminates the capillary tube conventionally provided in the outdoor unit, forms the inner diameter of the liquid communication pipe smaller (for example, 1/2) than the conventional one, and reduces the output of this liquid communication pipe. A gas-liquid separator is connected to the side, and the liquid reservoir and gas reservoir of the gas-liquid separator are connected to the inlet and outlet sides of the evaporator, respectively. Cold JJ even if it is longer (for example, twice as long)! tc1 can be made smaller than before. Therefore, it has the following specific effects.

(b) Since the liquid communication pipe can be made longer than before, it is possible to install a separate air conditioner in a location such as Door C (for example, overseas) to increase the distance between the outdoor unit and the indoor unit. It is a pilgrimage.

(b) Even if the liquid connection V is lengthened, the amount of refrigerant does not increase compared to the conventional one, and when the refrigerant liquid changes from high pressure to medium pressure in the liquid connection pipe, flash gas that does not participate in the cooling effect is generated, and this flash Since the gas is separated by the gas-liquid separator and does not pass through the evaporator, the pressure loss of the refrigerant in the evaporator can be reduced, and the evaporation pressure can be kept relatively low.
And the ratio of refrigerant liquid to refrigerant gas in the evaporator increases and evaporates; (the heat transfer coefficient at K improves. Therefore,
Refrigerant! The refrigeration effect per 1'L1 circulation increases,
Cooling capacity will not decrease.

In addition, since the amount of refrigerant charged does not increase even if the liquid communication pipe is lengthened, if the compressor is a fully enclosed type that is suitable for mounting the refrigerant on top to prevent refrigerant leakage, the refrigerant will circulate together with the refrigerant during cooling operation. The lubricating oil of the compressor does not become difficult to return to the compressor. Therefore, damage to the compressor is not caused.

Also, Ki f4! , i-divider is provided not within the indoor unit but near it, the indoor unit can be made smaller and thinner.

[Brief explanation of the drawing]

Fig. 1 is a refrigerant circuit diagram in an embodiment of a separate air conditioner according to the present invention, and Fig. 2 is a refrigeration cycle diagram showing the changing state of the refrigerant on a Mollier diagram to explain the action of Fig. 1. , FIG. 3 is a refrigerant circuit diagram in another embodiment of the present invention, and FIG. 4 is a refrigerant circuit diagram in a conventional example. (1) Compressor, (2) Condenser, (4) Outdoor unit, (5) Evaporator, (6) Indoor unit, (7
) (7a) (7b)... Oil side communication pipe, (8)... Gas side communication pipe, (17)... Gas-liquid separator, (17a) - Liquid reservoir of gas-liquid separator (17) , (17b) Gas-liquid separator (
17) gas reservoir section, (18)...cupillary tube, (19)...flash gas relief pipe, (20)...gas-liquid separation device, (21,)(22)...switching section. 1 "-- Agent Patent Attorney Shun Furusawa Saku 115
Patent Attorney Kano - Male

Claims (3)

[Claims] (1) A compressor and a condenser connected to the discharge side of the compressor are provided in the outdoor unit, and a gas-liquid separator is connected to the outlet side of the condenser via a liquid side communication pipe with a small inner diameter. The liquid reservoir section and the gas reservoir section of the gas-liquid separator are connected to the inlet side and the outlet side of the evaporator in the indoor unit, respectively, and the outlet side of the evaporator is connected to the A separate air conditioner characterized by being connected to the suction side of a compressor to form a refrigerant circuit. (2) The separated air conditioner according to claim 1, wherein the gas-liquid separator is provided in the indoor unit, and its liquid reservoir is connected to the inlet side of the evaporator via a capillary tube. Machine. (3) The separated air according to claim 1, wherein the gas-liquid separator is provided near the indoor unit, and its gas reservoir is connected to the outlet side of the evaporator via a capillary tube. harmonizer.