JP2018136080A - refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress noise in a refrigerator including a compressor, a condenser, an expander, an evaporator and a refrigerating cycle having a pipe for sequentially connecting them. SOLUTION: A refrigerating cycle having a compressor, a condenser, an expander, an evaporator and a pipe 12 for sequentially connecting these is provided on the outer peripheral side of the pipe 12 and inside between the outer peripheral surface of the pipe 12. A tubular body 14 that defines the space S, and a partition plate 15 that is provided in the cylinder 14 and divides the internal space S into a plurality of cavities 16 that are adjacent to each other in the circumferential direction and the radial direction. Provided is a refrigerator including a pipe-side communication portion 23 for communicating the cavity 16 in contact with the outer peripheral surface of the pipe 12 and the inside of the pipe 12, and a cavity-side communication portion 24 for communicating the cavities 16 adjacent to each other in the radial direction. [Selection diagram] Fig. 3

Description

  The present invention relates to a refrigerator.

  The refrigerator is a heat source device that is widely used in applications such as factory air conditioning having a clean room such as an electrical and electronic related factory, and district heating and cooling. As the refrigerator, a unit is known in which components such as a centrifugal compressor, a condenser, and an evaporator are arranged in the vicinity to be integrated (see, for example, Patent Document 1).

JP 2002-327700 A

  As the efficiency of refrigerators increases, the increase in noise generated from refrigerators has become an issue. The causes of noise generated from the refrigerator are roughly classified into two types: noise caused by mechanical causes and noise caused by fluid causes.

It is known that noise due to fluid causes is generated due to pressure drop (pressure change) or flow instability in locations where various valves, piping elbows, rectifying plates, and the like are present. Noise generated by fluid causes as described above has the property of becoming a wide frequency band noise (medium frequency band and high frequency band), resonating with the acoustic impedance of piping inside the refrigerator, etc. Is known to be amplified. It is effective to reduce the excitation force before the acoustic impedance of the pipe or the like and the noise resonate, and noise countermeasures near the sound source are effective.
In addition, a refrigerator that is integrated with components such as a centrifugal compressor, a condenser, and an evaporator is required to be smaller in size, so that the size of the acoustic device used for noise countermeasures is small. There is a problem that it is limited.

  An object of the present invention is to provide a refrigerator capable of suppressing noise in a refrigerator including a compressor, a condenser, an expander, an evaporator, and a refrigeration cycle having pipes that sequentially connect them. .

  According to the first aspect of the present invention, the refrigerator is provided on the outer peripheral side of the compressor, the condenser, the expander, the evaporator, and the refrigeration cycle having a pipe that sequentially connects these, A cylindrical body that defines an internal space between the pipe and an outer peripheral surface, and a plurality of cavities that are provided in the cylindrical body and that are adjacent to each other in the circumferential direction and the radial direction. A partition plate, a pipe-side communication portion that communicates the cavity in contact with the outer peripheral surface of the pipe, and the inside of the pipe, and a cavity-side communication portion that communicates the cavities adjacent in the radial direction.

According to such a configuration, noise generated from at least one of the compressor, condenser, expander, and evaporator constituting the refrigerator resonates with the resonance space of the other component via the pipe. Noise can be reduced before doing so.
In addition, a tubular cylinder is provided on the outer periphery of the pipe, and noise is reduced by a plurality of cavities (resonance spaces) formed in the internal space of the cylinder. Therefore, the size of each cavity is adjusted. Noise in a wide frequency band can be reduced.

  In the refrigerator, the cavities adjacent to each other may have different volumes.

  According to such a configuration, it is possible to reduce the noise in the middle frequency band with a large volume cavity and reduce the noise in the high frequency band with a small volume cavity. Thereby, a big effect can be acquired in a small space regarding noise reduction.

  In the refrigerator, a plurality of the cylinders may be provided so as to be adjacent to each other in the axial direction of the pipe.

  According to such a configuration, sound absorption characteristics can be ensured in a wider frequency band without increasing the size of the cylindrical body in the radial direction.

According to the present invention, before the noise generated from at least one of the compressor, condenser, expander, and evaporator constituting the refrigerator resonates with the resonance space of the other component via the pipe. In addition, noise can be reduced.
In addition, a tubular cylinder is provided on the outer periphery of the pipe, and noise is reduced by a plurality of cavities (resonance spaces) formed in the internal space of the cylinder. Therefore, the size of each cavity is adjusted. Noise in a wide frequency band can be reduced.

It is a schematic block diagram of the refrigerator of embodiment of this invention. It is a schematic block diagram of the compressor of the refrigerator of embodiment of this invention, a condenser, and piping which connects these. It is a partial cross section perspective view of the acoustic device of the refrigerator of the embodiment of the present invention. It is an expansion perspective view of the cavity of the acoustic device of the refrigerator of embodiment of this invention. It is a graph explaining the sound absorption performance of the acoustic device of the refrigerator of embodiment of this invention. It is a partial cross section perspective view of the acoustic device of the modification of embodiment of this invention.

Hereinafter, a refrigerator 1 according to an embodiment of the present invention will be described in detail with reference to the drawings.
As shown in FIG. 1, the refrigerator 1 of the present embodiment includes a compressor 2 that compresses a refrigerant W, a condenser 3 that condenses the refrigerant W compressed by the compressor 2 with cooling water, and a condenser 3. A first expansion valve 4 that is an expander that depressurizes the refrigerant W, and an economizer 6 (gas-liquid separator) that separates the refrigerant W from the first expansion valve 4 into a gas-liquid two-phase.

  The refrigerator 1 also includes an inflow path 8 that allows the gas phase W1 from the economizer 6 to flow into the compressor 2, a second expansion valve 5 that depressurizes the liquid phase from the economizer 6, and a second expansion. And an evaporator 7 for evaporating the refrigerant W from the valve 5.

  A hot gas bypass pipe 9 is provided between the vapor phase portion of the condenser 3 and the vapor phase portion of the evaporator 7. The hot gas bypass pipe 9 is provided with a hot gas bypass valve 10 for controlling the flow rate of the high-temperature refrigerant gas flowing through the hot gas bypass pipe 9.

The refrigerator 1 has a refrigeration cycle 11 having a pipe 12 that sequentially connects a compressor 2, a condenser 3, a first expansion valve 4, a second expansion valve 5, and an evaporator 7. Specifically, a pipe 12a that connects the compressor 2 and the condenser 3, a pipe 12b that connects the condenser 3 and the economizer 6, a pipe 12c that connects the economizer 6 and the evaporator 7, and an evaporator 7 and a pipe 12d for connecting the compressor 2 to each other.
As the refrigerant W, for example, alternative fluorocarbon R134a (hydrofluorocarbon) is used.
The piping 12 connecting the compressor 2 and the condenser 3 is provided with an acoustic device 13 that reduces noise generated in the compressor 2.

The compressor 2 is a centrifugal two-stage compressor, and is driven by an electric motor (not shown) whose rotational speed is controlled by an inverter that changes an input frequency from a power source.
The condenser 3 is a device that cools the refrigerant W compressed by the compressor 2 by heat exchange with cooling water or the like, and changes the state to a liquid state. For example, the condenser 3 is a shell and tube heat exchanger.

The first expansion valve 4 adiabatically expands and depressurizes the liquid refrigerant W from the condenser 3 to evaporate part of the liquid, thereby bringing the refrigerant W into a gas-liquid two-phase state.
The economizer 6 is a device that separates the refrigerant W, which is in a gas-liquid two-phase state in the first expansion valve 4, into a gas phase W1 and a liquid phase.

The inflow path 8 is a device that causes the gas phase W1 separated from the gas-liquid two-phase refrigerant W by the economizer 6 to flow into the compressor 2.
Similar to the first expansion valve 4, the second expansion valve 5 adiabatically expands and depressurizes the refrigerant W that is separated only by the economizer 6 and becomes only the liquid phase. In addition, in the refrigerator 1 of this embodiment, it is set as the structure which decompresses the refrigerant | coolant W using an expansion valve, However, It is not restricted to this, You may decompress the refrigerant | coolant W using another means.
The evaporator 7 evaporates the refrigerant W from the second expansion valve 5 by exchanging heat with water or the like to obtain a saturated vapor state.

  As shown in FIG. 2, the acoustic device 13 is provided in a pipe 12 a that connects the compressor 2 and the condenser 3. The acoustic device 13 is attached in the vicinity of the condenser 3 of the pipe 12a.

As shown in FIG. 3, the acoustic device 13 includes a cylindrical body 14 and a partition plate 15 that partitions the internal space S of the cylindrical body 14. The inner space S of the cylindrical body 14 is partitioned into a plurality of cavities 16 by the partition plate 15.
The cylindrical body 14 is a cylindrical member provided on the outer peripheral side of the pipe 12a over the entire circumference in the circumferential direction. The cylindrical body 14 defines an internal space S between the outer peripheral surface of the pipe 12a. The cylindrical body 14 includes a pair of side wall portions 18 that are orthogonal to the piping axis Ad and are provided over the entire circumference of the piping 12a, and a cylindrical portion 19 that is coaxial with the outer peripheral surface of the piping 12a. ing.

  A partition plate 15 that forms a plurality of cavities 16 that are adjacent to each other in the circumferential direction and the radial direction in the inner space S is provided inside the cylindrical body 14. The partition plate 15 includes a radial partition plate 15 a that is parallel to the outer peripheral surface of the pipe 12 a and the cylindrical portion, and a circumferential partition plate 15 b that is orthogonal to the side wall portion 18.

In other words, the main surface of the radial partition plate 15a faces the radial direction. The radial partition plate 15 a is a radially inner wall surface and a radially outer wall surface of the substantially rectangular parallelepiped cavity 16.
The main surface of the circumferential partition plate 15b faces the circumferential direction. The circumferential partition plate 15 b is a wall surface on one circumferential side and a wall surface on the other circumferential side of the substantially rectangular parallelepiped cavity 16.

The partition plates 15 are arranged so that the volumes of the plurality of cavities 16 are different. For example, the first cavity 16a, the second cavity 16b, the third cavity 16c, and the fourth cavity 16d shown in FIG. 4 are all different in volume.
In addition, the volume of all the cavities 16 does not need to be different, and, for example, six cavities 16 having different volumes may be continuously arranged in the circumferential direction.

  A plurality of cavities 16 are stacked in the radial direction of the pipe 12. The acoustic device 13 has a two-stage cavity 16 in the radial direction of the pipe 12a. The number of cavities 16 is not limited to this, and may be three or more.

  The cavities 16 that are in contact with the pipe 12a communicate with the flow paths in the pipe 12, respectively. That is, among the cavities 16 that are stacked in a plurality of stages in the radial direction, the first through hole 23 (pipe-side communication portion) is formed in the pipe 12 that is the radially inner wall of the innermost cavity 16. Has been. The first through-hole 23 is a pipe-side communication portion that communicates the cavity 16 in contact with the outer peripheral surface of the pipe 12 and the inside of the pipe 12.

  The first through hole 23 is formed in the center of the cavity 16. The first through hole 23 is circular. The shape of the first through hole 23 is not limited to a circular shape, and may be a rectangular shape or a slit shape.

  The second-stage cavity 16 (the cavity 16 radially outside the cavity) communicates with the cavity 16 one stage before the radially inner side. A second through hole 24 (cavity side communication portion) is formed in the radially inner wall portion of the second-stage cavity 16.

  The volume of each cavity 16 and the diameters of the through holes 23 and 24 can be appropriately adjusted according to desired sound absorption characteristics. In other words, the sound absorption characteristics of the acoustic device 13 can be adjusted by adjusting the volume of each cavity 16 and the diameters of the through holes 23 and 24.

Next, the effect | action of the acoustic device 13 of the refrigerator 1 of this embodiment is demonstrated.
The noise generated in the compressor 2 is a wide frequency band noise (medium frequency band and high frequency band) generated due to fluid factors. Since the acoustic device 13 of the present embodiment includes the cavities 16 having different sizes, the sound absorption characteristics can be secured in a wide frequency band. For example, the NZ sound in the middle frequency band is reduced by the large cavity 16 (resonance space). That is, the gas in the cavity 16 serves as a spring and absorbs the kinetic energy of sound, thereby reducing noise.
Furthermore, high frequency band NZ sounds are reduced by the small cavities 16.
The refrigerator 1 of the present embodiment can adjust the sound absorption performance of the acoustic device 13 by adjusting the volume of the cavity 16 of the acoustic device 13 and the hole diameters of the through holes 23 and 24.

FIG. 5 is a graph comparing the sound absorption performance of the acoustic device 13 with the vertical axis representing sound absorption performance and the horizontal axis representing noise frequency (Hz). The comparison target is an acoustic device having the same cavity volume.
As shown in FIG. 5, the sound absorbing performance of the acoustic device 13 of the present embodiment can exhibit the sound absorbing performance with respect to noise in a wider frequency band as compared with an acoustic device having the same cavity volume. .

According to the said embodiment, before the NZ sound (noise of a wide frequency band) of the compressor 2 which comprises the refrigerator 1 resonates with resonance space, NZ sound can be reduced.
Moreover, since the cylinder 14 was provided in the outer periphery of the piping 12, and it was set as the structure which reduces NZ sound by the several cavity 16 formed in the internal space S of the cylinder 14, the magnitude | size of each cavity 16 was adjusted. Noise in a wide frequency band can be reduced.

Specifically, the NZ sound in the middle frequency band can be reduced with the cavity 16 having the large volume, and the NZ sound in the high frequency band can be reduced with the cavity 16 having the small volume. Thereby, a big effect can be acquired in a small space regarding noise reduction.
In particular, in the case of the refrigerator 1 having the compressor 2, the condenser 3, the expansion valves 4 and 5, the evaporator 7, and the refrigeration cycle 11 having the pipe 12 that sequentially connects these, the acoustic device that can be attached to the pipe 12. The size of 13 is limited. Since the acoustic device 13 of the present embodiment has a cylindrical shape provided on the outer peripheral side of the pipe 12, it can be attached to a narrow portion around the pipe 12.

  Moreover, the sound absorption performance of the acoustic device 13 can be adjusted by adjusting the volume of the cavity 16 of the acoustic device 13 and the hole diameters of the through holes 23 and 24.

Next, an acoustic device according to a modification of the embodiment of the present invention will be described.
As shown in FIG. 6, the acoustic device 13 </ b> B according to the modification of the embodiment of the present invention is provided with a plurality of cylinders 14 so as to be adjacent in the axial direction of the pipe 12 a. That is, the other cylinder body 14 is provided on one axial direction side of the one cylinder body 14. The side wall 18 on one side in the axial direction of one cylindrical body 14 and the side wall 18 on the other side in the axial direction of the other cylindrical body 14 may be common. Further, the cylindrical portion 19 of one cylindrical body 14 and the cylindrical portion 19 of the other cylindrical body 14 may be common.

According to this modification, sound absorption characteristics can be secured in a wider frequency band without increasing the size of the cylindrical body 14 in the radial direction.
Further, by providing a plurality of cylinders 14 adjacent to each other in the axial direction of the pipe 12, the sound absorption performance of the acoustic device 13 can be adjusted by increasing or decreasing the number of the cylinders 14.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes design changes and the like within a scope not departing from the gist of the present invention. .

  In the above embodiment, the acoustic device 13 is installed in the pipe 12a between the compressor 2 and the condenser 3. However, the present invention is not limited to this. For example, the acoustic device 13 may be disposed in the pipes 12 b and 12 c between the condenser 3 and the evaporator 7, the pipe 12 d between the evaporator 7 and the compressor 2, and the hot gas bypass pipe 9. Furthermore, the number of acoustic devices 13 is not limited to one. For example, the acoustic devices 13 may be attached to all the pipes 12 or two may be attached to one pipe 12.

DESCRIPTION OF SYMBOLS 1 Refrigerator 2 Compressor 3 Condenser 4 1st expansion valve 5 2nd expansion valve 6 Economizer 7 Evaporator 8 Inflow path 9 Hot gas bypass pipe 10 Hot gas bypass valve 11 Refrigeration cycle 12 Piping 13 Acoustic device 14 Cylinder 15 Section Plate 15a Radial partition plate 15b Circumferential partition plate 16 Cavity 18 Side wall portion 19 Cylindrical portion 23 First through hole (pipe side communication portion)
24 Second through hole (cavity side communication part)
S Internal space W Refrigerant

Claims (3)

A compressor, a condenser, an expander, an evaporator, and a refrigeration cycle having a pipe for sequentially connecting them;
A cylindrical body that is provided on the outer peripheral side of the pipe and forms a cylindrical shape that defines an internal space with the outer peripheral surface of the pipe;
A partition plate provided in the cylindrical body and partitioning the internal space into a plurality of cavities adjacent to each other in a circumferential direction and a radial direction;
A pipe-side communication section for communicating the cavity in contact with the outer peripheral surface of the pipe and the inside of the pipe;
A refrigerator having a cavity side communication portion for communicating cavities adjacent in the radial direction.   The refrigerator according to claim 1, wherein the cavities adjacent to each other have different volumes.   The refrigerator according to claim 1 or 2, wherein a plurality of the cylindrical bodies are provided so as to be adjacent to each other in the axial direction of the pipe.

Images