JP3802190B2 - Refrigeration equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a structure for eliminating bubbles (hereinafter referred to as flash gas) generated in a condenser in the condenser.
[0002]
[Prior art]
In a refrigeration apparatus such as an air conditioner, a fin / tube condenser is generally used. This type of condenser is integrally provided with a heat exchange section divided into a plurality of paths, a junction pipe connected to an outlet pipe of each heat exchange section, and a supercooling coil connected to the junction pipe. A gas refrigerant is supplied to each heat exchange unit, and the gas refrigerant is condensed in each heat exchange unit to become a liquid refrigerant. This liquid refrigerant flows into the supercooling coil through the junction pipe, and this supercooling coil is sufficient. After being supercooled, it is supplied to a decompression device such as a capillary tube located downstream.
[0003]
[Problems to be solved by the invention]
In the above-described condenser, when the supply amount of the gas refrigerant is small, the gas refrigerant cannot be completely condensed in the condenser, and there is a problem that a part of the refrigerant remains as flash gas in the liquid refrigerant. Even when supercooling is performed using a supercooling coil, there is a problem that the flash gas remains as it is when the flow of the liquid refrigerant is fast. When the flash gas flows into the capillary tube or the evaporator while being mixed in the liquid refrigerant, there is a problem that refrigerant noise (abnormal noise due to the refrigerant flow) is generated.
[0004]
Therefore, an object of the present invention is to provide a refrigeration apparatus that can effectively eliminate flash gas.
[0005]
[Means for Solving the Problems]
In order to solve the above problems, the invention of claim 1 is a refrigeration apparatus comprising a compressor, a condenser, a decompression device, and an evaporator, wherein the condenser is divided into a plurality of passes, and each heat exchange. A merging pipe connected to the outlet pipe of the unit and a supercooling coil connected to the merging pipe are integrally formed, and the pipe diameter of the merging pipe is larger than the pipe diameters of the outlet pipe and the supercooling coil And the distance between the connection position of the supercooling coil and the connection position of the outlet pipe closest to the supercooling coil is set to be not less than three times the tube diameter of the junction pipe. Is.
[0006]
According to the present invention, the flash gas stays in the junction pipe for a long time, and is cooled by the liquid refrigerant, whereby the condensation of the flash gas is promoted, and therefore the flash gas can flow into the decompression device and the evaporator. This eliminates the generation of refrigerant noise.
[0007]
According to a second aspect of the present invention, in the first aspect of the present invention , a mesh member is provided inside the junction pipe.
[0008]
According to the present invention, since the flash gas having a predetermined size or more is subdivided by the mesh member, the flash gas is likely to disappear.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
[0018]
FIG. 1 is a refrigerant circuit diagram according to an embodiment of the present invention. As shown in FIG. 1, the air conditioner includes an outdoor unit 1 and an indoor unit 2. The outdoor unit 1 includes an accumulator 11 that removes the liquid refrigerant from the gas refrigerant, a compressor 12 that compresses the refrigerant gas to a predetermined condensation pressure, and a condenser that cools and liquefies the high-temperature and high-pressure gas refrigerant (outdoor heat exchange). ) 13, an outdoor fan 14 that blows air to the condenser 13, and a supercooling coil 13 </ b> F that recools the liquid refrigerant.
[0019]
The indoor unit 2 accommodates a capillary tube (decompression device) 16 that depressurizes the liquid refrigerant, a flow divider 17 that diverts the liquid refrigerant, and an evaporator (indoor heat exchanger) 18 that evaporates the depressurized liquid refrigerant. Has been.
[0020]
In FIG. 1, when the compressor 12 is driven, as indicated by solid arrows, the refrigerant is a condenser 13, a supercooling coil 13 </ b> F, a capillary tube (decompression device) 16, a flow divider 17, and an indoor heat exchanger (evaporator) 18. And in the order of the accumulator 11. At this time, the outdoor heat exchanger 13 radiates heat and the indoor heat exchanger 18 absorbs heat to perform cooling operation.
[0021]
FIG. 2 is a plan view of the outdoor unit 1 of FIG. Inside the outdoor unit 1, a compressor 12, a condenser 13, and an outdoor fan 14 are arranged. The condenser 13 is a so-called fin-tube heat exchanger, and as shown in FIG. 3A or 3C, five tubes (heat exchange portions) 13A to 13E each bent in a meandering manner, and a supercooling coil 13F. And a plurality of fins are integrally provided between the heat exchange units 13A to 13E and the supercooling coil 13F.
[0022]
The five inlet pipes b _{1 to} b ₅ of each of the heat exchange units 13A to 13E are connected to the inlet side merging pipe 21, and the merging pipe 21 is connected to the gas pipe 100. Further, as shown in FIG. 3B, the five outlet pipes c _{1 to} c ₅ of each heat exchange section 13A to 13E are connected to the outlet side junction pipe 22, and this junction pipe 22 is connected to the inlet of the supercooling coil 13F. The outlet of the supercooling coil 13F is connected to the liquid pipe 200. Five pipe diameters of the outlet pipe c ₁ to c ₅ of the heat exchange portion 13A-13E is smaller than the tube diameter of the tube of the heat exchange portion 13A-13E, in the outlet tube c ₁ to c ₅ passage Is narrowed once, and the flow path is configured to expand rapidly when entering the junction tube 22.
[0023]
In this embodiment, when setting the tube diameter D of the merging pipe 22, the refrigerant flow velocity v flowing in the merging pipe 21 is slower than the rising speed V of the bubbles in the merging pipe 22, as shown in FIG. (V> v) The tube diameter D of the merging tube 22 is set. Specifically, when the pipe diameter d1 of the outlet pipes c _{1 to} c ₅ is d1 = 7.92 mm, the pipe diameter D of the merge pipe 22 is set to D = 19.05 mm. The pipe diameter D of the collecting pipe 22 is larger than the tube diameter d2 of the supercooling coil 13F as well be larger than the tube diameter d1 of the outlet tube c ₁ to c _5. Specifically, d2 = 9.52 mm. Further the distance L between the connection position of the supercooling coil 13F and connection position of the outlet tube c ₅ closest to the supercooling coil 13F is set to be more than three times the pipe diameter D of the collecting pipe 22. In this embodiment, L is set to 58.95 mm or more.
[0024]
Next, the operation of this embodiment will be described.
[0025]
The high-temperature and high-pressure gas refrigerant discharged from the compressor 12 flows into the merging pipe 21 via the gas pipe 100 as shown in FIG. 3A, and is divided into five tubes 13A to 13E therefrom. The diverted gas refrigerant gradually liquefies and condenses into a liquid refrigerant while repeating meandering while dissipating heat in the tubes in contact with the fins. Thereafter, the liquid refrigerant liquefied condensation is substantially completed flowing into the collecting pipe 22 on the outlet side through the outlet pipe c ₁ to c ₅ of the heat exchange unit 13A~13E as shown in Figure 3B.
[0026]
In this embodiment, when the refrigerant is not completely condensed by the condenser 13 due to various conditions such as the refrigerant amount and temperature, the flash gas remains in the liquid refrigerant. This flush gas flows into the merging pipe 22 together with the liquid refrigerant. The merging pipe 22 has a diameter larger than that of the conventional merging pipe and is set to D = 19.65 mm. Therefore, as shown in FIG. Since the refrigerant flow velocity v flowing inside becomes slower than the rising speed V of the bubbles in the merging pipe 22, the flash gas rises in the merging pipe 22.
[0027]
Accordingly, after the flash gas is removed from the joining pipe 22, the liquid refrigerant joining the joining pipe 22 flows into the supercooling coil 13F, where it is sufficiently subcooled, and then from the outlet of the supercooling coil 13F. The liquid enters the liquid pipe 200 and is supplied to the capillary tube 16 and the evaporator 18 through the liquid pipe 200.
[0028]
According to this embodiment, the flash gas is removed in the junction tube 22, and almost no flash gas remains in the liquid refrigerant supplied to the capillary tube 16 and the evaporator 18. Therefore, the refrigerant caused by the flash gas Generation of sound or the like can be suppressed almost completely.
[0029]
Various results were repeated testing, the pipe diameter D of the (1) the collecting pipe 22 as described above is to remove efficiently flash gas in the collecting pipe 22 from the pipe diameter d1 of the outlet tube c ₁ to c ₅ (2) The position where the supercooling coil 13F is connected and the closest to the supercooling coil 13F (the closest) It has been found that it is desirable to set the distance L between the connection position of the outlet pipe c _{5 at} the lower part to be not less than three times the pipe diameter D of the merging pipe 22. In this case, the flash gas in the merging pipe 22 almost rises, this flash gas stays in the merging pipe 22 for a long time, condenses in contact with the liquid refrigerant in the meantime, liquefies and almost disappears in the merging pipe 22. I understood that
[0030]
As another embodiment, it has been found that a mesh member 23 may be provided inside the merging pipe 22 as shown in FIG. According to this, the flash gas larger than the mesh of the mesh member 23 is divided, and the reduced flash gas has a large surface area / volume, so that it becomes relatively easy to become a liquid refrigerant. Therefore, it was found that the flash gas quickly becomes a liquid refrigerant and disappears.
[0031]
As mentioned above, although this invention was demonstrated based on one Embodiment, it is clear that this invention is not limited to this. For example, in the present embodiment, the fin-tube condenser has been described. However, the present invention is not limited to this, and the present invention can be applied to other types of condensers.
[0032]
【The invention's effect】
As described above, according to the present invention, the flash gas stays in the merging pipe for a long time and contacts the liquid refrigerant during this time, whereby the flash gas is liquefied and disappears. As a result, the flash gas does not flow out into the liquid pipe, and it is possible to prevent generation of refrigerant noise in the decompression device or the evaporator due to the flash gas.
[0033]
Further, by providing the mesh member in the junction pipe, the flash gas can be subdivided and easily changed into a separated refrigerant, so that the flash gas can be effectively extinguished.
[Brief description of the drawings]
FIG. 1 is a refrigerant circuit diagram showing an embodiment of the present invention.
FIG. 2 is a plan view showing an outdoor unit.
FIG. 3A is a side view of a 5-pass condenser according to the present embodiment, FIG. 3B is a diagram illustrating a junction tube, and C is a plan view of the 5-pass condenser according to the present embodiment.
FIG. 4 is a diagram showing a state in which flash gas rises in a merge pipe.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Outdoor unit 2 Indoor unit 11 Accumulator 12 Compressor 13 Condenser (Outdoor heat exchanger)
14 Outdoor fan 15 Supercooling coil 16 Capillary tube (pressure reduction device)
17 Shunt 18 Evaporator (Indoor heat exchanger)
21 Inlet side merging pipe 22 Outlet side merging pipe 23 Mesh member

Claims (2)

  In a refrigeration apparatus including a compressor, a condenser, a decompression device, and an evaporator, the condenser is divided into a plurality of paths, a confluence pipe connected to an outlet pipe of each heat exchange section, and the confluence pipe And a supercooling coil connected to the subcooling coil, wherein the tube diameter of the merging pipe is larger than the pipe diameters of the outlet pipe and the supercooling coil, and the connection position of the supercooling coil and the supercooling coil The distance between the connection position of the outlet pipe nearest to the pipe is set to be three times or more the pipe diameter of the merge pipe. The refrigerating apparatus according to claim 1 , wherein a net-like member is provided inside the junction pipe.

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