JP3483688B2 - Refrigeration cycle device with dryer - 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 cycle apparatus with a drier, and more particularly to a highly reliable drier for a cooling / heating refrigeration cycle equipped with a drier to reduce water in the refrigeration cycle. It relates to a mounting structure.

[0002]

2. Description of the Related Art The structure of a refrigerating cycle in which a dryer is provided in the refrigerating cycle is, for example, Jikkou 55-2678.
As shown in the refrigeration cycle diagram described in the publication, a dryer is provided between the condenser and the pressure reducer (capillary tube),
Water in the refrigeration cycle was absorbed. As shown in the above known example, when the liquid refrigerant flows through the dryer, the flow velocity is slow,
It is extremely unlikely that the granular synthetic zeolite in the drier will flow and break, resulting in generation of powder and crushed pieces.

However, when the refrigerant flows into the dryer after passing through the decompressor, as in a cooling / heating type air conditioner refrigeration cycle, the refrigerant must flow into the dryer in a two-phase liquid-gas flow. Therefore, there is a problem that the flow velocity into the dryer becomes high and the synthetic zeolite is rubbed at the flow velocity to be powdered or move to be destroyed. The powder and crushed pieces of synthetic zeolite move in the refrigeration cycle and enter the compressor, causing damage to the moving parts and reducing the reliability of the compressor, or the controller of small diameter piping and four-way valve. However, there was a problem that the fluid adhered to the surface and deteriorated with time of fluid control.

[0004]

In the prior art, a refrigeration cycle with a drier, which changes the flow of the refrigerant and changes the direction of the refrigerant flowing to the drier, as in a refrigeration cycle for an air conditioner of a heating and cooling type. In the apparatus, the movement of the refrigerant flowing in the dryer may destroy the synthetic zeolite in the dryer, and the powdered material or crushed pieces may damage the moving parts in the compressor.

The present invention has been made in order to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide a refrigerating cycle in which the flow velocity of the refrigerant flowing through the dryer is reduced to thereby improve the internal temperature of the dryer. It is an object of the present invention to provide a refrigeration cycle device with a dryer, which prevents synthetic zeolite from being broken by the movement of a refrigerant and prevents the compressor from being damaged by the fragments thereof, and which can improve the reliability of the compressor.

[0006]

In order to achieve the above object, the structure of the refrigerating cycle apparatus with a dryer according to the present invention comprises a compressor, a four-way valve, an outdoor heat exchanger, a pressure reducer and an indoor heat exchanger. HFC consisting of a vessel and piping connecting them
In a refrigeration cycle using a system refrigerant, two flow paths are provided between the decompressor and the indoor heat exchanger, the flow paths being divided by a branching means so as to limit a predetermined length. , A dryer containing a synthetic zeolite containing potassium as a main metal cation is provided.

More specifically, the synthetic zeolite in the dryer has pores having an average pore diameter of 2.8Å <pore diameter <3.3Å. Further, by using a bifurcated pipe as a branching means, two flow paths for dividing the refrigerant into a liquid refrigerant and a gas refrigerant are provided, and a dryer provided with a synthetic zeolite containing potassium as a main metal cation is provided. As the liquid refrigerant mainly flows in the flow path,
The flow rate is adjusted by the two connecting pipes forming the two flow paths.

The idea of developing the above technical means can be realized by slowing the flow rate in the dryer to prevent the movement of the synthetic zeolite due to the flow in order to prevent the destruction of the synthetic zeolite in the dryer. In particular, when the refrigerant flows in a two-phase flow of liquid-gas, the flow velocity becomes faster, but by providing a dryer and a bypass flow passage, it is considered that the refrigerant always flows at a low flow velocity in the dryer. is there.

That is, the function of the above technical means is as follows. A flow path that bypasses the dryer is provided, and a flow path that regulates the flow rate ratio between the dryer side and the bypass, in other words, a flow with a resistance that allows the liquid refrigerant to flow through the dryer. By constructing the passage, the flow rate of the liquid flowing through the dryer when the liquid refrigerant before depressurization and when the refrigerant after depressurization is caused to flow is set to a low flow rate at which pulverization and destruction of the synthetic zeolite does not occur. As a result, the destruction of the synthetic zeolite in the dryer can be prevented, and the reliability of the compressor can be improved.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below in comparison with prior art. [Embodiment 1] FIG. 1 is a system diagram of a cooling / heating and refrigerating cycle with a dryer showing one embodiment of the present invention, FIG. 2 is a system diagram of a conventional cooling / heating and refrigerating cycle with a dryer, and FIG. It is a diagram showing the flow velocity of the refrigerant flowing inside the different dryer. In FIGS. 1 and 2, components having the same device configuration are designated by the same reference numerals. 1 and 2, solid arrows indicate the direction of the refrigerant flow during cooling, and broken arrows indicate the direction of the refrigerant flow during heating.

In FIG. 1, 1 is a compressor, 2 is a four-way valve,
3 is an outdoor heat exchanger, 4 is a pressure reducer (expansion valve), 5, 9
Is a bifurcating pipe according to the branching means, 6, 7 are connecting pipes that form two flow paths that divide only between the bifurcating pipes 5 and 9, and 6a and 7a are connecting pipes. Capillary tube provided to reduce the pressure as necessary, 8,
Dryers 10a, 10 provided in the flow path on the side of the connection pipe 6
b, 11a and 11b are joints of the refrigerant piping system, 1
2 is an indoor heat exchanger. In addition, 13 is a synthetic zeolite in the dryer 8, which has an average pore diameter of 2.8Å <
It is of controlled porosity with small holes of pore size <3.3Å. Reference numeral 14 is a spring for filling the synthetic zeolite 13 between the porous plates.

FIG. 2 shows a conventional cooling / heating refrigeration cycle with a dryer, which does not have a connecting pipe 7 for bypassing the bifurcated pipes 5, 9 and the drying machine 8. Figure 3
Represents the flow rate of the refrigerant flowing through the cylindrical portion of the dryer 8. The horizontal axis represents the dryness x, the vertical axis represents the refrigerant flow rate v (m / s), and the refrigerant flow rate is 50 kg / h (refrigerant R -22) shows an example of the flow velocity when the inner diameter of the cylindrical portion of the dryer 8 is 25 mm.

First, the cooling operation state will be described with reference to FIG. The high-temperature and high-pressure refrigerant compressed by the compressor 1 flows as shown by a solid arrow, reaches the outdoor heat exchanger 3 through the four-way valve 2, and exchanges heat with outdoor air to be condensed and liquefied. The liquefied refrigerant is decompressed by the decompressor 4 to become a liquid-gas mixed refrigerant (dryness x = about 0.2), and the refrigerant branched by the bifurcated pipe 5 has an inner diameter d of the connecting pipes 6, 7 and a long length. By changing the flow rate and the like to change the flow resistance, the flow rate is adjusted by the connection pipes 6 and 7, and the flow is divided.

[0014] The connection pipe 6, the liquid - out of the refrigerant gas mixture, under the action of gravity when the slow flow, liquid - is adjusted so out liquid refrigerant in the refrigerant gas mixture is flow, the connecting pipe 6 The liquid refrigerant that has flowed flows between the synthetic zeolites 13 in the dryer 8 to remove water in the refrigeration cycle. On the other hand, a gas refrigerant of the liquid-gas mixed refrigerant flows through the connection pipe 7. The refrigerant in the connection pipe 6 passing through the dryer 8 merges with the gas refrigerant flowing in the connection pipe 7 in the bifurcated pipe 9, and the refrigerant reaches the indoor heat exchanger 12 to exchange heat with the indoor air. Evaporates. The latent heat of vaporization cools the room.

Here, in the case of the conventional refrigeration cycle shown in FIG. 2, the flow rate in the drier 8 is about 0.2 m / m because the dryness x is about 0.2 as can be read from FIG.
s. If the dryer 8 is placed in front of the decompressor 4, since the refrigerant is a liquid refrigerant (dryness x = 0), the flow velocity in the dryer 8 is about 0.025 m / s as seen in FIG. Becomes

By the way, in the refrigerating cycle of FIG. 1 in the present embodiment, the flow velocity of the refrigerant flowing in the dryer 8 is mainly determined by the resistance of the connecting pipes 6, 7. The flow rate flowing through the connecting pipes 6 and 7 is obtained by using the following equation (1). Dp = A · r · l / d ⁵ · G ² −−−−−−−−−−− (1) where Dp: Pressure difference A: Friction coefficient r: Specific gravity l: Pipe length d: Pipe inner diameter G: Flow rate

The flow rate of the refrigerant is 50 kg / h, the dryness (x) is 0.2, the liquid refrigerant is 40 kg / h in the connecting pipe 6, and the gas refrigerant is 10 kg / h in the connecting pipe 7. 1130kg / m ³ , specific gravity of gas refrigerant 66k
Assuming g / m ³ , the length ratio (l ₇ / l ₆ ) of the connecting pipes 6 and 7 is about 1/3 when the inner diameters of the pipes are the same and calculated from the equation (1). By doing this, the dryer 8
Liquid refrigerant can be flowed inside, and the flow velocity is 0.02m
/ S can be done very late.

Here, it is assumed that the liquid-gas mixed refrigerant (dryness x = about 0.2) is flown through the connecting pipes 6 and 7 without separating into the liquid refrigerant and the gas refrigerant by the bifurcated pipe 5. The flow velocity of the refrigerant flowing in the dryer 8 is about 0.
In order to obtain 025 m / s, the length ratio (l ₇ / l ₆ ) of the connecting pipes 6 and 7 is about 1/49 when calculated from the equation (1) with the inner diameters of the pipes being the same, which is not realistic.

Refrigerant during heating operation flows as indicated by the broken line arrow,
The refrigerant liquefied in the indoor heat exchanger 12 is the forked pipe 9
After being branched at, the flow rate is adjusted by the connecting pipes 6 and 7 to flow. The refrigerant flowing through the connection pipe 6 flows between the synthetic zeolites 13 of the dryer 8 to remove the water in the refrigeration cycle. The flow rate of the refrigerant flowing through the connection pipes 6 and 7 becomes the liquid refrigerant. When the length ratio (l ₇ / l ₆ ) of the connection pipes 6 and 7 is set to about 1/3, the flow ratio of the liquid refrigerant (G ₇ / G ₆ : G ₆ flow amount flowing in the connection pipe 6, G ₇ connection). The flow rate flowing through the pipe 7) is about 1.7 / 1. That is, G ₆ = 19 kg / h, G ₇ = 31 kg / h
The refrigerant flowing in the dryer 8 is a liquid refrigerant and the flow velocity can be very slow at 0.01 m / s.

According to the present embodiment, the flow velocity of 0.025 m / s when the liquid refrigerant flows in both the heating operation and the cooling operation.
It can be slowed down, the damage of the synthetic zeolite 13 of the dryer 8 can be prevented, and the reliability of the compressor 1 can be maintained.

Such a cooling / heating refrigeration cycle with a dryer has HFC refrigerants (HFC-32, HFC-2) which are considered as a substitute for the refrigerant R-22 (HCFC-22).
6, HFC-134a, etc.) is particularly effective in a refrigeration cycle. This is because an ester oil is considered as a refrigerating machine oil of the refrigeration cycle compressor 1 using an HFC refrigerant, and the ester oil causes hydrolysis when water enters and generates an acid. This acid has a problem that it corrodes mechanical parts and reduces the reliability of the compressor 1. Therefore, in order to remove water in the refrigeration cycle, the dryer 8 is provided with an HFC-based refrigerant (for example, HFC-32 has a molecular diameter of 3.2Å, HFC-125 has a molecular diameter of 4.2Å, HFC-125).
-134a does not mainly adsorb the molecular diameter of 4.2 Å, but adopts the synthetic zeolite 13 that mainly adsorbs water (molecular diameter of 2.8 Å).

It is particularly effective for the synthetic zeolite 13 to have a small hole diameter of 2.8Å <(pore diameter) <3.3Å as an average value of the pore diameters. The ones that come in are the most efficient. The basic chemical formula of synthetic zeolite can be represented as follows.

[Chemical 1] This synthetic zeolite contains potassium as a main component as a metal cation, and representative ones include Molecular Sieves XH-10C manufactured by Union Showa Co., Ltd.

[Embodiment 2] FIG. 4 shows a cooling and heating refrigeration cycle with a drier according to another embodiment of the present invention.
(A) is a main part systematic diagram, (b) is an expanded sectional view on arrow A of FIG. (A), and FIG. 4 mainly shows a distributor. In the figure, those having the same reference numerals as those in FIG. 1 are the same as those in the previous embodiment, and refrigeration cycle equipment not shown in FIG. 4 is the same as that in FIG. The distributor 15 is intended to realize the same operation and effect as those of the previous embodiment shown in FIG. 1 in a low cost and compact form with a reduced number of parts.

In the cooling / heating / refrigerating cycle with a dryer shown in FIG. 4, a distributor 15 is used as a branching means. The distributor 15 divides the inside of the distributor into upper and lower sections.
Two pieces 7P and 6P are provided, and these upper and lower pieces 7P
A connection port 15a connected to the pressure reducer 4 is provided between P and 6P, a connection port 15b communicating with the connection pipe 6 on the dryer 8 side is provided at the end on the side of the lower piece 6P, and the upper pipe is provided. The other end on the 7P side is provided with a connection port 15d leading to the refrigeration cycle pipe on the indoor heat exchanger 12 side, and the upper piece 7P and the connection port 1 are provided.
A merging port 15c with the connection pipe 6 on the dryer 8 side is provided in an intermediate portion with 5d. Then, these upper and lower two pieces 7P, 6P are provided with communication holes 7h, 6h capable of adjusting the flow rates of the respective connecting pipes.

More specifically, the upper piece 7P includes:
It has a communication hole 7h in its center, and the liquid-gas mixed refrigerant entering the distributor 15 from the connection port 15a via the expansion valve 4,
A flow resistance for sending the refrigerant gas is given to the merging port 15c and the connection port 15d in the distributor 15. On the other hand, the lower piece 6P has a communication hole 6h at the center thereof, and gives a flow resistance for sending the refrigerant liquid to the connection port 15b and the connection pipe 6 in the distributor 15. The refrigerant flowing through the connection pipe 6 flows between the synthetic zeolites 13 of the dryer 8 to remove water in the refrigeration cycle, as in the previous embodiment shown in FIG. In the refrigeration cycle shown in FIG. 4, the average value of the pore diameter of the synthetic zeolite 13, the flow of the liquid refrigerant into the dryer 8, the action and effects of the refrigeration cycle, etc. are all the same as those in the embodiment of FIG. Is.

[Third Embodiment] FIG. 5 is a system diagram of a cooling and heating refrigeration cycle with a drier, which shows still another embodiment of the present invention. In the figure, components having the same reference numerals as those in FIG. 1 are equivalent devices to the first embodiment described above, and therefore description thereof will be omitted. The embodiment shown in FIG. 5 is an example in which the dryer 8 is provided in the high pressure portion of the refrigeration cycle during the cooling operation. That is, between the decompressor 4 and the outdoor heat exchanger 3, two connecting pipes 6 and 7 for dividing the flow into a predetermined range are provided via the bifurcated pipes 5 and 9, and a dryer is provided on the connecting pipe 6 side. 8 are provided.

During the cooling operation, the refrigerant flows as shown by the solid arrow, and the refrigerant liquefied in the outdoor heat exchanger 3 is the two-forked pipe 5.
After being branched at, the flow rate is adjusted by the connection pipes 6 and 7 having high resistance to flow. At this time, since the liquid refrigerant flows through the dryer 8, the flow velocity is also slow. The refrigerant during the heating operation flows as indicated by the broken line arrow, and the refrigerant liquefied in the indoor heat exchanger 12 is decompressed by the decompressor (expansion valve) 4 to become a liquid-gas mixed refrigerant and branched by the two-way pipe 9. The refrigerant has resistance as described in the previous embodiment of FIG. 1 so that liquid refrigerant flows on the connection pipe 6 side and gas refrigerant flows on the connection pipe 7 side.

In the refrigerating cycle shown in FIG. 5, the average value of the pore diameter of the synthetic zeolite 13, the flow of the liquid refrigerant into the dryer 8, the action and effect of the refrigerating cycle, etc. It is similar to the form. Although not shown, it is also possible to reduce the cost by applying the distributor 15 of FIG. 4 in the example of FIG. 5 in which the dryer 8 is provided in the high pressure portion of the refrigeration cycle during the cooling operation. Needless to say.

[0029]

As described above in detail, according to the present invention, the refrigerating cycle is such that the flow rate of the refrigerant flowing through the dryer is reduced, whereby the synthetic zeolite in the dryer is It is possible to provide a refrigeration cycle device with a drier that can be broken by movement and can be prevented from damaging the compressor due to the fragments thereof, and that the reliability of the compressor can be improved.

[Brief description of drawings]

FIG. 1 is a system diagram of a cooling and heating refrigeration cycle with a dryer according to an embodiment of the present invention.

FIG. 2 is a system diagram of a conventional cooling / heating refrigeration cycle with a dryer.

FIG. 3 is a diagram showing a flow velocity of a refrigerant flowing inside a general dryer.

FIG. 4 is a main part system diagram of a cooling / heating and refrigerating cycle with a dryer according to another embodiment of the present invention.

FIG. 5 is a system diagram of a cooling and heating refrigeration cycle with a dryer according to still another embodiment of the present invention.

[Explanation of symbols]

1 ... Compressor, 2 ... Four-way valve, 3 ... Outdoor heat exchanger, 4 ... Decompressor (expansion valve), 5, 9 ... Forked pipe, 6, 7 ... Connection pipe, 6P, 7P ... Pace, 6h, 7h ... communication hole, 8 ...
Dryer, 10, 11 ... Joint, 12 ... Indoor heat exchanger, 13 ... Synthetic zeolite, 15 ... Distributor.

Continuation of the front page (72) Inventor Ichiro Fujibayashi 800 Tomita, Ohira-machi, Shimotsuga-gun, Tochigi Inside Tochigi HQ, Hitachi, Ltd. Hitachi Co., Ltd. Tochigi Headquarters (72) Inventor Toru Iizuka No. 800 Tomita, Ohira-cho, Shimotsuga-gun, Tochigi Prefecture Hitachi Co., Ltd. Tochigi Headquarters (56) References JP-A-6-288662 ) Japanese Patent Laid-Open No. 7-159004 (JP, A) Actual Development Sho 61-195272 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) F25B 43/00

Claims (8)

(57) [Claims] 1. A refrigeration cycle using a HFC refrigerant comprising a compressor, a four-way valve, an outdoor heat exchanger, a pressure reducer, an indoor heat exchanger, and a pipe connecting these components, in the pressure reducer and the chamber. Liquid-gas mixture decompressed by the decompressor during cooling operation via a branching means between the inner heat exchanger and the inner heat exchanger.
Of the above refrigerant, the liquid refrigerant flows by being adjusted by the action of gravity.
A flow path and a flow path through which the gas refrigerant flows are provided, and the liquid refrigerant is
A refrigeration cycle apparatus with a dryer, characterized in that a dryer containing a synthetic zeolite containing potassium as a main metal cation is provided in a flowing channel. 2. The refrigeration cycle apparatus with a drier according to claim 1, wherein the synthetic zeolite has small holes with an average pore diameter of 2.8Å <Y pore diameter <3.3Å. 3. A bifurcating pipe is used as a branching means to provide two channels for dividing a refrigerant into a liquid refrigerant and a gas refrigerant, and a dryer containing a synthetic zeolite containing potassium as a main metal cation is provided. The refrigeration cycle apparatus with a drier according to claim 1, wherein the flow rate is adjusted by the two connecting pipes forming the two flow paths so that the liquid refrigerant mainly flows in the one flow path. 4. A distributor is used as the branching means,
This distributor is provided with two upper and lower pieces that partition the inside of the distributor so that they can communicate with each other, and a connection port connected to the pressure reducer is provided between the upper and lower pieces, and the end of the lower piece is provided. The upper pipe has a connection port communicating with the connection pipe on the dryer side, and the other end of the upper pipe has a connection port communicating with the connection pipe on the indoor heat exchanger side. The refrigeration cycle apparatus with a drier according to claim 1, wherein a communication hole capable of adjusting a flow rate flowing to the pipe is provided. 5. A refrigeration cycle using an HFC refrigerant comprising a compressor, a four-way valve, an outdoor heat exchanger, a pressure reducer, an indoor heat exchanger, and a pipe connecting these components, in the refrigeration cycle and the chamber. Liquid-gas mixture decompressed by the decompressor during heating operation via a branching means between the outer heat exchanger and the outer heat exchanger.
Of the above refrigerant, the liquid refrigerant flows by being adjusted by the action of gravity.
A flow path and a flow path through which the refrigerant flows are provided, and the liquid refrigerant flows
That the flow path, the dryer with the refrigeration cycle apparatus is characterized by providing the incoming ivy dryer synthetic zeolite potassium as a metal cation and the main ones. 6. The refrigerating cycle apparatus with a drier according to claim 5, wherein the synthetic zeolite has small holes having an average pore diameter of 2.8Å <pore diameter <3.3Å. 7. A bifurcating pipe is used as a branching means to provide two channels for dividing a refrigerant into a liquid refrigerant and a gas refrigerant, and a dryer containing a synthetic zeolite containing potassium as a main metal cation is provided. The refrigeration cycle apparatus with a dryer according to claim 5, wherein the flow rate is adjusted by the two connecting pipes forming the two flow paths so that the liquid refrigerant mainly flows in the one flow path. 8. A distributor is used as the branching means,
This distributor is provided with two upper and lower pieces that partition the inside of the distributor so that they can communicate with each other, and a connection port connected to the pressure reducer is provided between the upper and lower pieces, and the end of the lower piece is provided. A connection port leading to a connection pipe on the dryer side and a connection port leading to the connection pipe on the outdoor heat exchanger side are provided at the other end of the upper piece, and the upper and lower two pieces are respectively connected. The refrigeration cycle apparatus with a drier according to claim 5, wherein a communication hole capable of adjusting a flow rate flowing to the pipe is provided.