JP2018124024A - Condenser - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress noise, in a condenser that includes: a guide part for guiding refrigerant introduced from the outside; and a heat exchange part into which refrigerant is introduced via the guide part.SOLUTION: A condenser includes: a guide part 27 for guiding refrigerant introduced from the outside; and a heat exchange part into which refrigerant is introduced via the guide part 27. The guide part 27 includes: a pair of plate parts 35 arranged while being separated apart from each other, at least one of the plate parts formed with a plurality of hole parts 36; and a sound absorptive material 37 disposed between the pair of plate parts 35.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a condenser.

  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 a refrigerator, a unit is known in which constituent devices 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 generated by a condenser among noises caused by fluid is generated due to pressure drop (pressure change) or flow instability in a place where a rectifying plate or the like exists. 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.
As a countermeasure against such noise, it is effective to reduce the excitation force before the acoustic impedance of the pipe or the like and the noise resonate, and the noise countermeasure near the sound source is effective.

  The present invention provides a condenser capable of suppressing noise in a condenser including a guide unit that guides a refrigerant introduced from the outside and a heat exchange unit that introduces the refrigerant via the guide unit. The purpose is to do.

  According to a first aspect of the present invention, the condenser includes a guide part that guides a refrigerant introduced from the outside, and a heat exchange part into which the refrigerant is introduced via the guide part, A pair of guide portions are disposed with a space between each other, and include a plate portion in which a plurality of holes are formed in at least one of the guide portions, and a sound absorbing material disposed between the pair of plate portions.

  According to such a structure, the noise level of a condenser can be reduced by making a guide part into a structure which has a sound absorption characteristic. That is, the excitation force can be reduced before the noise generated from the condenser reaches the resonance space provided in the subsequent stage of the condenser.

  The condenser may include a plurality of the guide portions, and an interval between the plate portions of one of the guide portions may be different from an interval between the plate portions of the other guide portion.

  According to such a configuration, by adopting a structure in which the distance between the pair of plate portions is made different, the guide portion can have a sound absorption characteristic that reduces mid-high frequency noise in a wide frequency band.

  In the condenser, the diameter of the hole portion of one of the guide portions may be different from the diameter of the hole portion of the other guide portion.

  According to such a configuration, by adopting a structure in which the diameter of the hole is made different, it is possible to make the guide part have a sound absorption characteristic that reduces noise of medium and high frequencies in a wide frequency band.

  According to this invention, the noise level of a condenser can be reduced by making a guide part into a structure which has a sound absorption characteristic. That is, the excitation force can be reduced before the noise generated from the condenser reaches the resonance space provided in the subsequent stage of the condenser.

It is a schematic block diagram of the refrigerator of embodiment of this invention. It is sectional drawing of the condenser of embodiment of this invention. It is detail drawing of the guide part of the condenser of embodiment of this invention. FIG. 4 is a side view of the guide portion of the condenser according to the embodiment of the present invention, as viewed from the direction of the arrow IV in FIG. 3. It is sectional drawing of the guide part of the condenser of embodiment of this invention. It is a top view of the board part of the guide part 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 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.

Next, the detailed structure of the condenser 3 of this embodiment is demonstrated.
As shown in FIG. 2, the condenser 3 of the present embodiment includes a bottomed cylindrical casing 14, a first tube plate 15 and a second tube plate 16 provided inside the casing 14, and a refrigerant W. 14, an introduction pipe 12 a that is introduced into the interior of the pipe 14, a discharge pipe 12 b that discharges the refrigerant W to the outside of the casing 14, a plurality of heat transfer tubes 19 (heat exchange portions) into which cooling water is introduced, and the outside. A plurality of upstream rectifying plates 27, downstream rectifying plates 28, and baffle plates 25 (baffle plates), which are guide portions for guiding the refrigerant W, are provided. The refrigerant W is introduced into the heat transfer tube 19 through the upstream rectifying plate 27, the downstream rectifying plate 28, and the baffle plate 25 which are guide portions.

  The casing 14 includes a cylindrical casing body 22 and a pair of lid portions 23 provided at one end and the other end in the longitudinal direction L of the casing body 22. The first tube sheet 15 is a plate-like member provided on one end side of the casing 14. The main surface of the first tube sheet 15 is parallel to the main surface of the lid portion 23. The space on the one end side of the first tube sheet 15 is a first header inner space S1.

The second tube sheet 16 is a plate-like member provided on the other end side of the casing 14. The main surface of the second tube sheet 16 is parallel to the main surface of the lid portion 23. The space on the other end side than the second tube sheet 16 is a second header inner space S2.
The first tube plate 15 and the second tube plate 16 are formed with a plurality of through holes 24 through which the heat transfer tubes 19 are inserted. A space surrounded by the casing 14, the first tube plate 15, and the second tube plate 16 is a casing internal space S3.

  The plurality of heat transfer tubes 19 extend in the longitudinal direction L of the casing 14 in the casing inner space S3. The plurality of heat transfer tubes 19 are positioned at predetermined positions by being inserted into the plurality of through holes 24 formed in the first tube plate 15 and the second tube plate 16.

  The introduction pipe 12a is a pipe for introducing the refrigerant W into the casing inner space S3. The introduction pipe 12 a is formed at the approximate center in the longitudinal direction L of the casing 14. The central axis of the introduction pipe 12 a is substantially orthogonal to the central axis A of the casing 14. That is, the flow direction of the refrigerant W introduced into the casing inner space S <b> 3 via the introduction pipe 12 a is substantially orthogonal to the extending direction of the heat transfer tube 19.

  The discharge pipe 12b is a pipe for discharging the refrigerant W from the casing inner space S3. The discharge pipe 12b is formed at the approximate center in the longitudinal direction L of the casing 14 and on the opposite side of the introduction pipe 12a. The central axis of the discharge pipe 12 b is substantially orthogonal to the central axis A of the casing 14.

  The baffle plate 25 is a guide portion that uniformly distributes the introduced refrigerant W into the condenser 3 body. The upstream rectifying plate 27 and the downstream rectifying plate 28 are guide portions that rectify the introduced refrigerant W and the refrigerant W that has collided with the baffle plate 25.

As shown in FIG. 3, the baffle plate 25 is a plate-like member, and is provided at a position where the refrigerant W introduced from the introduction pipe 12a collides. The baffle plate 25 is disposed between the introduction pipe 12 a and the plurality of heat transfer tubes 19 so that the main surface of the baffle plate 25 is parallel to the central axis A of the casing 14.
As shown in FIG. 4, the baffle plate 25 is disposed so as to be inclined with respect to the flow direction of the refrigerant W (the central axis of the introduction pipe 12a). The baffle plate 25 may be arranged such that the main surface of the baffle plate 25 is orthogonal to the flow direction of the refrigerant W.

  The plurality of upstream rectifying plates 27 and the downstream rectifying plates 28 are arranged on the upstream side of the baffle plate 25. The plurality of upstream rectifying plates 27 are arranged on the upstream side of the downstream rectifying plate 28.

The upstream rectifying plate 27 guides the refrigerant W flowing so as to be orthogonal to the central axis A of the casing 14 along the central axis A of the casing 14. The upstream rectifying plate 27 includes an upstream inclined portion 30 that is inclined so as to approach the end of the casing 14 toward the baffle plate 25, and an upstream rectifying plate main body portion 31 that is formed along the central axis A of the casing 14. ,have.
The condenser 3 of the present embodiment has four upstream rectifying plates 27. Hereinafter, of the four upstream rectifying plates 27, the two upstream rectifying plates 27 disposed on the upstream side are referred to as first upstream rectifying plates 27a, and the two upstream rectifying plates disposed on the downstream side of the first upstream rectifying plate 27a. 27 is referred to as a second upstream rectifying plate 27b.

  The downstream rectifying plate 28 has a main portion 32 along the flow direction of the refrigerant W introduced from the introduction pipe 12a, and a downstream inclined portion 33 connected to the downstream end of the main portion 32. The downstream inclined portion 33 is inclined so as to approach the end portion of the casing 14 toward the baffle plate 25. Specifically, the downstream inclined portion 33 includes a first inclined surface 33a inclined so as to approach one end of the heat transfer tube 19 toward the downstream side in the flow direction of the refrigerant W, and an upstream end portion of the first inclined surface 33a. A second inclined surface 33b that is connected to the upstream end portion and is inclined so as to approach the other end of the heat transfer tube 19 toward the downstream side in the flow direction of the refrigerant W. The downstream end of the downstream inclined portion 33 is connected to the baffle plate 25.

  As shown in FIG. 5, the baffle plate 25 and the rectifying plates (upstream rectifying plate 27 and downstream rectifying plate 28) that constitute the guide portion are disposed in pairs with a space therebetween, and at least one of the plurality of hole portions 36 is provided. And a sound absorbing material 37 disposed between the pair of plate portions 35. That is, the baffle plate 25 and the rectifying plates 27 and 28 have a structure in which the sound absorbing material 37 is sandwiched between a pair of perforated plates.

  The plurality of hole portions 36 formed in the plate portion 35 are circular. The hole portions 36 are irregularly arranged in the plate portion 35. The arrangement of the holes 36 is not limited to an irregular arrangement, and may be a regular arrangement. When the holes 36 are regularly arranged, a punching metal can be used as the plate part 35.

The plate part 35 can be formed from a metal such as SUS304, for example. The shape of the hole 36 is not limited to a circular shape, and may be a rectangular shape or a slit shape. The material of the plate portion 35 is not limited to metal, and may be plastic such as polyacetal resin, for example.
Further, the hole 36 may not be formed in both the pair of plate portions 35. In other words, at least one of the pair of plate portions 35 may be provided with the hole 36.

  The sound absorbing material 37 is made of a sound absorbing material specified by JIS. The sound absorbing material 37 is made of, for example, rock wool, glass wool, urethane foam, or the like.

  The guide unit of the present embodiment has a sound absorption characteristic that reduces noise in a wide frequency band (medium frequency band and high frequency band). Here, the medium and high frequency noise in the wide frequency band of the wide frequency band is noise having a spectrum in which acoustic energy is distributed in a relatively wide frequency band.

In order to realize the above sound absorption characteristics, the guide portion of the present embodiment changes the interval between the pair of plate portions 35 for each guide portion. The interval between the pair of plate portions 35 of the first upstream rectifying plate 27a is G1, the interval between the pair of plate portions 35 of the second upstream rectifying plate 27b is G2, and the interval between the pair of plate portions 35 of the baffle plate 25 is G3. Then, the guide part of this embodiment is formed so that it may become G1 <G2 <G3.
The setting of the interval between the pair of plate portions 35 is not limited to the above setting. For example, the interval G3 may be set to be the largest, or the interval G2 may be set to be the largest.

  Moreover, the guide part of this embodiment changes the diameter of the hole part 36 formed in the board part 35 for every guide part. The diameter of the hole portion 36 of the plate portion 35 of the first upstream rectifying plate 27a is D1, the diameter of the hole portion 36 of the plate portion 35 of the second upstream rectifying plate 27b is D2, and the diameter of the hole portion 36 of the plate portion 35 of the baffle plate 25. When the diameter is D3, the guide portion of the present embodiment is formed so that the diameter D1, the diameter D2, and the diameter D3 are different.

  According to the said embodiment, the noise level of the condenser 3 can be reduced by making a guide part into the structure which has a sound absorption characteristic. That is, the noise can be reduced before the noise generated from the condenser 3 resonates with the space in the pipe 12 between the condenser 3 and the evaporator 7. In other words, the excitation force can be reduced before the noise generated from the condenser 3 reaches the resonance space provided in the subsequent stage of the condenser 3.

Moreover, since the guide part diverts the conventional structure, it can be realized in a small remodeling range. Thereby, the guide part which enables noise reduction can be formed at low cost.
Further, by adopting a structure in which the distance between the pair of plate portions 35 is made different and a structure in which the diameter of the hole portion 36 is made different, the guide portion can have a sound absorption characteristic that reduces noise in a wide frequency band. .

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 diameter of the hole 36 formed in the plate portion 35 is the same in the same plate portion 35, but is not limited thereto. For example, as shown in FIG. 4, the diameter of the hole 36 may be made different with the same plate portion 35.
If the performance is satisfactory, the distance between the pair of plate portions 35 of the guide portion and the diameter of the hole portion 36 may all be the same.

1 Refrigerator 2 Compressor 3 Condenser 4 First expansion valve (expander)
5 Second expansion valve (expander)
Reference Signs List 6 economizer 7 evaporator 8 inflow path 9 hot gas bypass pipe 10 hot gas bypass valve 11 refrigeration cycle 12 piping 14 casing 15 first tube plate 16 second tube plate 19 heat transfer tube 22 casing body 23 lid portion 24 through hole 25 obstruction Board (guide section)
27 Upstream rectifier (guide)
28 Downstream rectifier (guide)
30 upstream inclined portion 31 upstream rectifying plate main body portion 32 main portion 33 downstream inclined portion 35 plate portion 36 hole portion 37 sound absorbing material L longitudinal direction S1 first header inner space S2 second header inner space S3 casing inner space W refrigerant

Claims (3)

A guide for guiding refrigerant introduced from the outside;
A heat exchange part into which the refrigerant is introduced via the guide part,
The guide part is
A pair of plates that are spaced apart from each other, and at least one plate portion having a plurality of holes formed therein,
A condenser having a sound absorbing material disposed between the pair of plate portions. A plurality of the guide portions;
The condenser according to claim 1, wherein an interval between the plate portions of one guide portion is different from an interval between the plate portions of another guide portion.   The condenser according to claim 1 or 2, wherein a diameter of the hole portion of one of the guide portions is different from a diameter of the hole portion of the other guide portion.

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