JPH0552447A - Freezing device - Google Patents

Abstract

PURPOSE:To reduce the generation of noise of a freezing device by a method wherein, in the freezing device in which a pressure reducer of which a part of a freezing cycle is composed is covered with a sound absorbing member, the sound absorbing member is composed of a plurality of sound absorbing materials being different in density. CONSTITUTION:A capillary tube 11, the part protruded from a heat-exchanger 15 to the capillary tube 11 side, of a heat-exchanger pipe 151, and the part protruded to the opposite side, thereof are covered with a sound absorbing member 3 being a composite substance formed of clay 33, galvanized sheet iron 32 and clay 31 being different in density. By previously processing the galvanized sheet iron in a given shape, mounting of it on a device body is facilitated. The galvanized sheet iron 32 (a sound absorbing member having high density) reduces the generation of noise from a pressure reducer, and the clay 31 and 33 (a sound absorbing member having low density) suppresses the generation of vibration of the pressure reducer. As a result, noise generated by the pressure reducer is absorbed by the sound absorbing member to reduce the generation of noise.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigeration system, and more particularly to a refrigeration system having a low noise level.

[0002]

BACKGROUND OF THE INVENTION Noise from refrigeration systems comes primarily from compressors and decompressors. Of these, the refrigerant decompressor, which rapidly expands the refrigerant to reduce the pressure, is a member that constitutes an indoor unit in a home-use separate air conditioner (hereinafter referred to as a refrigerating device), and therefore has a particular noise level. Is often a problem.

Therefore, a butyl rubber or the like having a sound absorbing effect is manually attached to a decompressor, for example, a capillary tube so as not to obstruct the exterior, or inserted between pipes and equipment for sound insulation. However, since this method requires a relatively large number of steps for mounting, it must be said that this is a problematic measure in view of the fact that the refrigerating apparatus is manufactured by the flow work method.

Further, Japanese Utility Model Publication No. 57-20971 proposes a device for covering the periphery of a capillary tube (pressure reducer) and an expansion tube with a soft putty or unvulcanized rubber as a sound absorbing member. However, even in this device, since it is necessary to mount the sound absorbing member in a narrow place where it is difficult to work, there are many manufacturing problems.

[0005]

Therefore, the development of a low-noise refrigerating apparatus which has a sound absorbing effect equal to or better than that of a conventionally used butyl rubber etc. and which is easy to manufacture has been awaited.

[0006]

The present invention has been made to solve the above-mentioned problems of the prior art. In a refrigeration system in which a decompressor constituting a part of a refrigeration cycle is covered with a sound absorbing member, The refrigeration apparatus is characterized in that the member is made of a plurality of sound absorbing materials having different densities.

[0007]

With the sound absorbing member having a low density (such as rubber), the vibration of the decompressor can be easily suppressed, and the noise from the decompressor can be suppressed to a low level by the sound absorbing member having a high density (such as galvanized iron).

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an example of the structure of a small refrigerating device (separate type) used for home use. This refrigeration system comprises an indoor unit 1 and an outdoor unit 2, and the indoor unit 1 is a pressure reducer, specifically, a capillary tube 1.
1, expansion tube 12, liquid side nipple 13L, flow divider 14, heat exchanger 1
5, the gas side nipple 13G, and the outdoor unit 2 includes a gas side closing valve 21, an accumulator 22, a compressor 23, a heat exchanger 24, and a liquid side closing valve 25. Then, at least the capillary tube 11 of the indoor unit 1
And the expansion tube 12 is covered by the sound absorbing member 3.

The indoor unit 1 is assembled into a compact shape in an actual device as shown in FIG. That is, the heat exchange pipe 151 is bent to reduce the size of the heat exchanger.
A drain pan 16 is provided under the drain pipe 15, and a drain hose 161 leads from the drain pan 16 to the outside together with a refrigerant pipe 152 that guides the liquid refrigerant and a refrigerant pipe 153 that sends the gasified refrigerant to the compressor 23. A front panel having an air intake port and an air discharge port on the front surface of the heat exchanger 15 (including the drain pan 16).
17 is attached, and a frame 19 is attached by arranging a cross flow fan 18 in the rear.

When the indoor unit 1 is compactly assembled as shown in FIG. 2, the sound absorbing member 3 is provided at the same time as the capillary tube 11 and the expansion tube 12 as well as the flow divider 14 and the protruding portion of the heat exchange pipe 151 on the capillary tube 11 side. Often covered. Such a large cover facilitates the work, and the effect is further enhanced in terms of noise reduction. further,
It is also possible to cover the heat exchange pipe 151 protruding to the opposite side of the capillary tube 11 with another sound absorbing member 3.

Table 1 shows the materials used for the sound absorbing member 3 and the structure thereof.

[Table 1]

As an example of the sound absorbing member 3, FIG.
9 shows a configuration of No. 9. 31 and 33 are clay containing calcium carbonate-paraffin as a main component, and 32 is galvanized iron having a plate thickness of 0.8 mm. If the sound absorbing member 3 has such a configuration, for example, the clay side of 31 is the capillary tube 11 and the expansion tube.
By pressing against the capillary tube 12, the clay portion with which the capillary tube 11 or the like abuts is reduced, and the work of covering the capillary tube 11 and the expansion tube 12 can be easily performed. If the galvanized iron 32 having a high rigidity, which is pressed into a predetermined shape, is provided with a screw hole or the like, the galvanized iron 32 can be easily and surely fixed to the heat exchanger 15 or the like.

The carbon fibers mentioned in Table 1 are coal pitch type carbon felts. Generally softening point 230 ° C
The isotropic pitch of ˜320 ° C. is spun-proof at 270 ° C. to 360 ° C. by the vortex method, and the fiber is carbonized and fired at 650 ° C. to 1300 ° C. to produce raw cotton having the following physical properties. .. Diameter: 10 to 18 μm Bulk density: 0.01 to 0.06 g / ml Length: 30 to 130 mm Tensile strength; 50 to 100 Kg / mm ² Tensile modulus; 2.7 to 5.0 Ton / mm ² elongation; 1.7 to 2.4%

When used in the refrigerating apparatus of the present invention, it is necessary to improve the thermal conductivity, reduce the surface relationship per unit weight, and reduce the density in order to improve heat resistance and molecular sound absorption. For this reason, in particular, an isotropic pitch having a softening point of 290 ° C. was spun at 340 ° C. by the vortex method, and then was subjected to 3
It was made infusible at 20 ° C., and carbonized and baked at 910 ° C. to obtain curled carbon fibers having the following physical properties. Shape; curled yarn diameter; about 13 μm bulk density; 0.05 g / ml true density; 1.6 g / ml porosity; 0.982 tensile strength; about 80 Kg / mm ² elongation; 2% softening point; 2000 ℃

The coal pitch-based carbon felt manufactured by adjusting as described above has the following characteristics. 1) High sound absorption effect in the mid-high range. 2) The silencer can be made lightweight and compact by taking advantage of its light weight. 3) It has excellent heat resistance, chemical resistance and water resistance.

The sound absorbing members shown in Table 1 above are attached to two left and right sides of the refrigerating apparatus illustrated in FIG.
A sound collecting microphone was installed at a position of cm to investigate the noise reduction effect of the sound absorbing member. The noise was measured when the evaporation pressure of the refrigeration cycle suddenly dropped and the condensation pressure increased several tens of seconds after the device was turned on.

From FIG. 3 showing the investigation result, the test No. of the comparative example in which the sound absorbing member was not attached at all. 1 noise is the maximum,
Test No. of comparative example using rubber alone. No. 2 of the comparative example using carbon fiber and carbon fiber alone. In comparison between the four, the use of rubber is more effective in reducing noise. However, in the test No. 1 in which the sound absorbing member was a rubber / carbon fiber / rubber composite.
3 and test No. 3 of galvanized iron / rubber / carbon fiber / rubber composite. It can be seen that No. 5 is more effective in reducing noise.

Further, from FIG. 4, the test No. of the comparative example in which the clay containing calcium carbonate-paraffin as the main component was used alone. Test No. 6 of a comparative example in which clay composed mainly of natural stone is used alone. Although the noise was considerably reduced in each of the samples, in this case as well, the test No. 7 used in combination with the galvanized iron having a thickness of 0.8 mm was used rather than the clay alone. 9 and the test No. used in combination with carbon fiber. It can be seen that 10 is more effective in reducing noise. It should be noted that the epoxy resin, when used alone, does not have the noise reducing effect as much as the clay, but since it is about the same as the carbon fiber, it does not prevent the epoxy resin from being used in combination with the clay.

[0019]

As described above, according to the present invention, it is possible to manufacture a refrigerating machine with less noise than the conventional refrigerating machine using butyl rubber or the like as a sound absorbing material. Moreover, the sound-absorbing member can be easily attached to the apparatus main body by pre-pressing a desired material having a high density, for example, a metal into a predetermined shape or molding carbon fiber, resin, or the like. Therefore, there is no particular problem in manufacturing by the flow work method. Therefore, the manufacturing cost can be reduced, and a low-priced refrigerating apparatus can be supplied, which is a great effect.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a configuration example of a refrigeration apparatus.

FIG. 2 is an exploded view of an indoor unit.

FIG. 3 is an explanatory diagram showing a noise measurement result.

FIG. 4 is an explanatory diagram showing another noise measurement result.

FIG. 5 is an explanatory diagram showing a configuration example of a sound absorbing member.

[Explanation of symbols]

 1 Indoor Unit 11 Capillary Tube 12 Expansion Tube 14 Flow Divider 15 Heat Exchanger 151 Heat Exchange Pipe 2 Outdoor Unit 3 Sound Absorbing Member

Claims (1)

[Claims] 1. A refrigerating apparatus in which a decompressor constituting a part of a refrigerating cycle is covered with a sound absorbing member, wherein the sound absorbing member is composed of a plurality of sound absorbing materials having different densities.