JP5938821B2 - Refrigeration equipment - Google Patents

Description

  The present invention relates to a refrigeration apparatus using a compressor, a condenser, a decompression apparatus, and an evaporator, and more particularly to a refrigeration apparatus with improved energy efficiency.

Conventionally, large commercial refrigeration and freezer used in refrigeration and freezing warehouses, etc., connected the heat source side unit containing the compressor, condenser, etc., and the use side unit equipped with an evaporator with inter-unit piping. A refrigeration system is used. For example, a heat source side unit is placed outdoors, a use side unit is placed on the ceiling or upper wall of a refrigerated or frozen warehouse, and each unit is connected by piping to circulate the refrigerant in the piping. Yes.
In this case, it is important to improve the energy efficiency of the refrigeration apparatus, and various technical innovations have been made conventionally.

However, the conventional technology described above has not been sufficient to improve energy efficiency.
Accordingly, an object of the present invention is to solve the above-described problems of the prior art and to provide a highly efficient refrigeration apparatus.

The present invention relates to a refrigerating apparatus in which a heat source side unit provided with a compressor and a condenser and a use side unit provided with an evaporator are connected by an inter-unit pipe, and the liquid pipe constituting the inter-unit pipe includes Before reaching the pressure reducing device, the refrigerant liquefied by the condenser is provided with a supercooling device having a spiral refrigerant flow path, and the supercooling device has a plurality of coils connected in series. The function of supercooling the refrigerant by making the inner diameter of the downstream coil smaller than the inner diameter of the upstream coil and making the inner diameter of the downstream coil 50% or more of the inner diameter of the upstream coil and increasing the flow rate of the refrigerant. equipped with, wherein the.
In the present invention, the refrigerant discharged from the compressor is liquefied by the condenser and flows into the supercooling device. This supercooling device has a spiral refrigerant flow path, and in the flow path, the refrigerant is subjected to spin rotation and flows at an increased flow velocity, thereby being supercooled.
As a result of conducting various verification tests, the present applicant has found that the refrigerant is spin-rotated and accelerated, and is subcooled and almost completely liquefied in the process of flowing through the supercooling device of this configuration. I found it. That is, it has been found that the refrigerant that has passed through the supercooling device is almost completely liquefied compared to the refrigerant that flows through the liquid pipe in a conventional cycle that does not include the supercooling device. The almost completely liquefied refrigerant is decompressed by the decompression device and flows into the evaporator. In the present invention, the refrigeration efficiency is remarkably improved as compared with the prior art by the amount that the refrigerant is supercooled and almost completely liquefied and decompressed. According to the demonstration test, energy savings of 16%, for example, were achieved compared to the conventional technology.

In this case, the supercooling device may be configured by winding a pipe having an inner diameter set in accordance with a discharge capacity of the compressor in a coil shape.
The supercooling device includes a coil for flowing the refrigerant from the bottom to the top in the spiral flow path, and has a function of supercooling the refrigerant by increasing the flow rate of the refrigerant while being influenced by gravity. Good.
The decompression device may be disposed in the usage side unit, and the supercooling device may be disposed in the vicinity of the usage side unit.

  In the present invention, the refrigeration efficiency is remarkably improved as compared with the prior art by the amount that the refrigerant is supercooled and liquefied almost completely before reaching the decompression device. According to the verification test, for example, energy saving of 16% can be achieved compared with the conventional technology.

  It is a block diagram which shows the large refrigeration apparatus for business by one embodiment of this invention.   It is a figure which shows the supercooling apparatus by one embodiment.   It is a figure which shows the supercooling apparatus by another embodiment.   It is a block diagram which shows the large refrigeration apparatus for business by another embodiment.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.
In FIG. 1, reference numeral 1 denotes a refrigeration / freezer warehouse. The warehouse 1 includes a machine room 100 and a freezer 200 and is partitioned by a partition wall 300. The inner wall of the freezer 200 and the partition wall 300 are covered with a heat insulating material (not shown).
In this warehouse 1, a large-scale commercial refrigeration apparatus 10 is installed. The refrigeration apparatus 10 includes a heat source side unit 20 and a use side unit 30, and the units 20 and 30 are connected by an inter-unit pipe 40 that circulates a refrigerant.
The heat source side unit 20 includes a compressor 21, a condenser 22, and an accumulator 23. These devices 21 to 23 are connected by a pipe 24, and each device 21 to 23 and the pipe 24 are arranged in a housing 24. Yes. The use side unit 30 includes an evaporator 31 and a decompression device 32, and these devices 31 and 32 are connected by a pipe 33, and these devices 31 and 32 and the pipe 33 are arranged in a housing 34.

In the present embodiment, the heat source side unit 20 is arranged in the machine room 100, the use side unit 30 is arranged on the upper wall (or ceiling) 200 </ b> A of the freezer 200, and between the pipes 24 and 33 of these units 20 and 30. Are connected by the unit pipe 40 composed of the liquid pipe 41 and the gas pipe 42. Further, the liquid pipe 41 constituting the inter-unit pipe 40 is a supercooling device for supercooling the refrigerant liquefied by the condenser 22 in a pipe line located between the condenser 22 and the decompression device 32. 50 is interposed.
The supercooling device 50 has a function of supercooling the refrigerant by applying spin rotation to the refrigerant and increasing the flow velocity of the refrigerant. Therefore, it is only necessary to have a spiral refrigerant flow path as long as it is configured to impart spin rotation to the refrigerant and increase the flow rate of the refrigerant. For example, a block-like structure having a helical refrigerant flow path therein It may be.

In the present embodiment, the supercooling device 50 has a configuration in which two coils 51 and 53 are connected in series as shown in FIG.
In general, the thickness of the liquid pipe 41 is not greatly changed according to the discharge capacity (flow rate) of the compressor 21. However, the inner diameters of the two coils 51 and 53 are set according to the discharge capacity (flow rate) of the compressor 21.
In the case of the 600W compressor 21, for example, the inner diameter is 3 mm, and in the case of the 3-horsepower compressor 21, for example, the inner diameter is 8 mm. However, the inner diameter of the downstream coil 53 is smaller than the inner diameter of the upstream coil 51. The coils 51 and 53 are connected by a pipe line 55 having an inner diameter equivalent to that of the liquid pipe 41.
The total number of turns of the two coils 51 and 53 is 15 to 30 turns, and in this embodiment, 20 turns.
The winding inner diameters of the two coils 51 and 53 are set according to the inner diameters of the coils 51 and 53. For example, a coil with an inner diameter of 3 mm is about 20 mm, and a coil with an inner diameter of 8 mm is about 30 to 32 mm. In consideration of the spin rotation to the refrigerant and the speed increase, the thinner the winding inner diameter, the better. However, the winding inner diameter cannot be reduced if the inner diameters of the coils 51 and 53 are increased in terms of production technology.
The supercooling device 50 is not limited to two coils, and may be constituted by a single coil 150 as shown in FIG.

It is desirable that the spiral flow path of the supercooling device 50 is gradually formed to have a small diameter from upstream to downstream. The realization of this configuration is difficult in terms of production technology with the configuration of FIG. 3, and in order to approximate the best mode and make it easy to manufacture in terms of production technology, as shown in FIG. 51 and 53 are employed, and in this case, the downstream coil 53 is constituted by a coil having a diameter smaller than that of the upstream coil 51.
In this structure, the downstream coil 53 functions as a throttle and has a drawback of reducing the pressure of the refrigerant. Is known. Therefore, the inner diameter of the downstream coil 53 is desirably 50% or more of the inner diameter of the upstream coil 51.

In the present embodiment, the supercooling device 50 is disposed substantially vertically along the side wall surface of the machine room 100 outside the housing 24 of the heat source side unit 20 as shown in FIG. With this structure, the refrigerant that has passed through the condenser 22 has a structure in which the flow path of the two coils 51, 53 flows from the bottom to the top, and the refrigerant flows through the flow path of the two coils 51, 53 through gravity. It is affected by the spin rotation, increases the flow velocity and flows.
By arranging the supercooling device (two coils 51, 53) 50 substantially vertically, the refrigerant that has passed through the condenser 22 undergoes supercooling and becomes almost completely liquefied refrigerant, and the decompression device 32 is provided. Has been found to be sent to.
Further, if the supercooling device 50 is configured to be disposed along the side wall surface of the machine room 100 outside the housing 24 of the heat source side unit 20, a conventional refrigeration device is already installed. When retrofitting 50, the assembling work becomes easy.

Next, the operation of the refrigeration apparatus 10 will be described.
In the present embodiment, the refrigerant discharged from the compressor 21 is liquefied by the condenser 22 and flows into the supercooling device 50 through the pipe 24. As shown in FIG. 2, the supercooling device 50 has a configuration in which two coils 51 and 53 are connected in series. The single coil 51 is subjected to spin rotation while being affected by gravity. Flow with increasing flow rate.
Next, it flows into the two-stage coil 53 having a diameter smaller than that of the one-stage coil 51, where it again receives the spin rotation while being influenced by gravity, and increases the flow velocity.

In this process, the refrigerant is spin-rotated and accelerated, and is supercooled.
As a result of various verification tests, the present applicant has found that the refrigerant is almost completely liquefied by being spin-rotated and accelerated and being supercooled in the process of flowing through the supercooling device 50 of this configuration. I found out. That is, it has been found that the refrigerant that has passed through the supercooling device 50 is almost completely liquefied compared to the refrigerant that flows through the liquid pipe 41 in a conventional cycle that does not include the supercooling device 50. The substantially completely liquefied refrigerant is decompressed by the decompression device 32, flows into the evaporator 31, and is used for cooling the freezer 200. In this configuration, the refrigeration efficiency is remarkably improved as compared with the prior art by the amount that the refrigerant is supercooled and almost completely liquefied and decompressed. According to the demonstration test, energy savings of 16% were achieved compared to the previous model.

FIG. 4 shows another embodiment.
In this embodiment, the decompression device 32 is disposed in the use side unit 30, and the supercooling device 50 is disposed substantially vertically along the inner wall surface of the freezer 200 in the vicinity of the use side unit 30. With this structure, since the two coils 51 and 53 are positioned in the vicinity of the decompression device 32, the distance between the downstream coil 53 and the decompression device 32 is shortened, and the refrigerant passing through the downstream coil 53 is evaporated. Since the gas immediately flows into the decompression device 32 in a completely liquefied state without being gasified, the refrigeration efficiency is further improved accordingly.

As described above, in each of the embodiments, it is only necessary to perform the construction of interposing the two coils 51 and 53 constituting the supercooling device 50 in the liquid pipe 41.
Therefore, even if it is the warehouse 1 in which the conventional refrigeration apparatus is already installed, there is an effect that it can be installed by a simple retrofitting work.

As mentioned above, although this invention was demonstrated based on one Embodiment, this invention is not limited to this, A various change implementation is possible. For example, the channel diameter of the supercooling device 50 is set to an inner diameter set according to the discharge capacity of the compressor, and if the supercooling effect by spin rotation and acceleration to the refrigerant is obtained, it is made thicker than the inner diameter of the liquid pipe 41. May be.
Moreover, this invention is not limited to application to the warehouse 1, For example, it can apply to all freezing apparatuses, such as an air conditioner, a cooling device, and a household refrigerator.

DESCRIPTION OF SYMBOLS 1 Refrigeration, refrigeration warehouse 10 Large commercial refrigeration equipment 20 Heat source side unit 21 Compressor 22 Condenser 23 Accumulator 24 Case 30 Use side unit 31 Evaporator 32 Decompression device 34 Case 40 Unit piping 41 Liquid pipe 50 Supercooling device 51, 53 Coil 100 Machine room 200 Freezer 300 Partition wall

Claims (4)

In a refrigeration apparatus in which a heat source side unit provided with a compressor and a condenser and a use side unit provided with an evaporator are connected by inter-unit piping.
The liquid pipe constituting the inter-unit piping is provided with a supercooling device having a spiral refrigerant flow path for supercooling the refrigerant liquefied by the condenser before reaching the decompression device ,
The supercooling device has a plurality of coils connected in series, the inner diameter of the downstream coil is smaller than the inner diameter of the upstream coil, and the inner diameter of the downstream coil is 50% or more of the inner diameter of the upstream coil. With the function of supercooling the refrigerant by increasing the flow rate of
A refrigeration apparatus characterized by that.   The refrigeration apparatus according to claim 1, wherein the supercooling device is configured by winding a pipe having an inner diameter set in accordance with a discharge capacity of the compressor in a coil shape. The supercooling device includes a coil for flowing a refrigerant from the bottom to the top in the spiral flow path, and has a function of supercooling the refrigerant by increasing the flow rate of the refrigerant while being influenced by gravity.
The refrigeration apparatus according to claim 1 or 2, wherein   The refrigeration apparatus according to any one of claims 1 to 3, wherein the decompression device is disposed in the use side unit, and the supercooling device is disposed in the vicinity of the use side unit. .

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