JP2009036248A - Vacuum heat insulation material and compressor equipped with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simultaneously carry out not only heat insulation, but also sound insulation of a compressor with an accumulator covered by a vacuum heat insulation material 1, by adding sound insulating performance to the heat insulation material 1. <P>SOLUTION: In the vacuum heat insulation material 1, the degree of vacuum in a sealed space 3 is adjusted to be a value which can add the sound insulating performance with not less than 20 dBA of transmission loss of sound passing through the vacuum heat insulation material 1. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a vacuum heat insulating material and a compressor provided with the vacuum heat insulating material, and particularly to a technology for improving sound insulation by a vacuum heat insulating material.

  2. Description of the Related Art Conventionally, a heat insulating material that covers the outer surface of an object and prevents heat transfer between the object and its outer peripheral space is known. And in this heat insulating material, a vacuum heat insulating material is mentioned as a thing excellent in the heat insulating performance especially. (For example, refer to Patent Document 1).

  Generally, a vacuum heat insulating material is constituted by covering a core material such as glass wool with a laminate sheet, and sealing the interior by reducing the pressure to a pressure lower than atmospheric pressure. And in the said vacuum heat insulating material, the heat insulation performance is improved by keeping the sealed space in which the core material was enclosed in the state close | similar to a vacuum.

By the way, the compressor mounted in the refrigeration apparatus is generally housed in a casing together with other component devices constituting the refrigeration apparatus. Since this compressor becomes high temperature during the operation of the refrigeration apparatus, it is conceivable that the heat of the compressor is transmitted to other element devices and the efficiency of the refrigeration cycle is lowered. Therefore, unlike the conventional compressor, it is necessary to insulate the compressor so that not only the sound generated in the compressor does not propagate to the outside but also the efficiency of the refrigeration cycle does not decrease.
JP 2007-182991 A

  However, although the vacuum heat insulating material is superior in heat insulating performance as compared with the conventional heat insulating material, the inventors of the present application show that the sound insulation effect is low even though the sealed space of the vacuum heat insulating material is close to a vacuum. Has been confirmed by performance tests. Therefore, for example, when a vacuum heat insulating material is applied to the compressor, it is conceivable that a sound insulating material must be separately provided in addition to the vacuum heat insulating material.

  The present invention has been made in view of such a point, and the purpose thereof is to add not only the sound insulation performance to the vacuum heat insulating material, but also the heat insulation of the object covered by the vacuum heat insulating material as well as the sound insulation. It is to be able to do it.

  The first invention is a vacuum having a core material (4) made of a heat insulating material and an outer packet member (2) in which a sealed space (3) for sealing the core material (4) at a pressure lower than atmospheric pressure is formed. Insulation is assumed. And in the said vacuum heat insulating material, the transmission loss of the sound which passes from one surface of the outer packaging member (2) containing a core material (4) to the other surface is set to 20 dBA or more. Here, examples of setting parameters for setting a desired transmission loss in the vacuum heat insulating material include the degree of vacuum of the sealed space (3) and the filling rate of the core material (4) with respect to the sealed space (3). The above degree of vacuum may be rephrased as the degree of negative pressure with respect to atmospheric pressure.

  In the first invention, in the vacuum heat insulating material, by adjusting the value of the setting parameter, the sound transmission loss through the vacuum heat insulating material is improved, and the sound insulation loss of the vacuum heat insulating material is 20 dBA or more. Performance is added.

  The second invention is characterized in that, in the first invention, a transmission loss for a sound having a frequency of 3 kHz or more and 20 kHz or less is set to 20 dBA or more. Here, the sound having a frequency of 3 kHz or more and 20 kHz or less is a sound in a high frequency band that is unpleasant to the human body.

  In the second invention, in the vacuum heat insulating material, by adjusting the value of the setting parameter, the transmission loss with respect to the sound in the high frequency band passing through the vacuum heat insulating material is improved. Sound insulation performance with a transmission loss of 20 dBA or more for sound in the frequency band is added.

  According to a third invention, in the first or second invention, the outer member (2) including the core material (4) has a thermal conductivity of 0.1 W / mK or less and the transmission loss of 20 dBA or more. The degree of vacuum of the sealed space (3) is set so as to be a value.

  In the third invention, the degree of vacuum of the sealed space (3) is defined as the setting parameter, and by adjusting the degree of vacuum, the vacuum heat insulating material has a heat insulation performance of 0.1 W / mK or less. Sound insulation performance with a transmission loss of 20 dBA or more is added.

  4th invention presupposes the compressor by which the outer peripheral surface of the casing was covered with the heat insulating material. And the heat insulating material of the said compressor is comprised by the vacuum heat insulating material as described in any one of 1st-3rd invention, It is characterized by the above-mentioned.

  In 4th invention, by comprising the heat insulating material of the said compressor with the vacuum heat insulating material as described in any one of 1st to 3rd invention, heat insulation and sound insulation of this compressor can be performed simultaneously. .

  According to the present invention, in the above vacuum heat insulating material, by adjusting the values of setting parameters such as the degree of vacuum of the sealed space (3) and the filling rate of the core material (4) with respect to the sealed space (3), transmission loss Can add a sound insulation performance of 20 dBA or more. And the heat insulation and sound insulation of this target object can be performed simultaneously by covering the outer surface of a target object with the vacuum heat insulating material which added this sound insulation performance.

  According to the second invention, in the vacuum heat insulating material, the values of setting parameters such as the degree of vacuum of the sealed space (3) and the filling rate of the core material (4) with respect to the sealed space (3) are adjusted. Thus, it is possible to add sound insulation performance with a transmission loss of 20 dBA or more for the sound in the high frequency band. Thereby, in the said vacuum heat insulating material, it can limit to the sound of the area | region unpleasant with respect to a human body, and can insulate.

  Further, according to the third invention, in the vacuum heat insulating material, by adjusting the degree of vacuum of the sealed space (3), the heat insulation performance with a thermal conductivity of 0.1 W / mK or less and the transmission loss are 20 dBA or more. The sound insulation performance can be added. And the heat insulation and sound insulation of this target object can be reliably performed by covering the outer surface of a target object with the vacuum heat insulating material which added this heat insulation performance and sound insulation performance.

  According to the fourth aspect of the invention, the heat insulating material of the compressor is constituted by the vacuum heat insulating material according to any one of the first to third aspects of the invention, whereby the heat insulation and sound insulation of the compressor are achieved. Can be done simultaneously. Therefore, since it is not necessary to provide a heat insulating material and a sound insulating material separately, heat insulation and sound insulation of the compressor can be performed at a lower cost compared to the case where they are provided individually.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  The air conditioner (10) of the present embodiment includes a refrigerant circuit (20) that performs a vapor compression refrigeration cycle, and the compressor with an accumulator (21) provided in the refrigerant circuit (20) includes The characteristic vacuum insulation (1) is attached. First, the configuration of the air conditioner (10) will be described.

-Configuration of air conditioner-
FIG. 3 shows a refrigerant circuit diagram of the air conditioner (10). As shown in FIG. 1, the air conditioner (10) includes an outdoor unit (11) and an indoor unit (12). A compressor (22) with an accumulator, a four-way switching valve (23), an outdoor heat exchanger (24), and an expansion valve (25) are provided in the casing of the outdoor unit (11). On the other hand, the indoor heat exchanger (26) is accommodated in the casing of the indoor unit (12). Then, the compressor with accumulator (22), the four-way switching valve (23), the outdoor heat exchanger (24), the expansion valve (25) and the indoor heat exchanger (26) are connected by a refrigerant pipe, and a refrigerant circuit ( 20). The refrigerant circuit (20) is configured such that a vapor compression refrigeration cycle is performed by circulating the refrigerant.

  The compressor with accumulator (22) includes a hermetic high-pressure dome type compressor (21a) and an accumulator (21b) connected to the suction side of the compressor (21a). A suction pipe (22a) is connected to the suction side of the compressor (21a) via an accumulator (21b), and a discharge pipe (22b) is connected to the discharge side of the compressor (21a). The suction pipe (22a) is connected to the third port of the four-way switching valve (23), and the discharge pipe (22b) is connected to the first port of the four-way switching valve (23).

  Moreover, as shown in FIG.4 and FIG.5, the sound-absorbing material (7) comprised with the glass wool is provided in the outer peripheral surface of the said compressor (22) with an accumulator. The sound absorbing material (7) is formed by an outer cylinder part (8a) that covers the outer peripheral surface of the compressor with accumulator (22) and a lid part (8b) that covers the upper opening of the outer cylinder part (8a). ing. Here, a corrugated uneven shape is formed on the compressor-side surface of the sound absorbing material (7). Thereby, an air layer is formed between the sound-absorbing material (7) and the compressor with an accumulator (22). This air layer makes it difficult for the vibration of the compressor with accumulator (22) to be transmitted to the sound absorbing material (7). As described above, the vacuum heat insulating material (1) is provided so as to cover the outer peripheral surface of the sound absorbing material (7). The vacuum heat insulating material (1) will be described later in detail.

  The outdoor heat exchanger (24) and the indoor heat exchanger (26) are so-called cross fin type fin-and-tube heat exchangers. One end of the outdoor heat exchanger (24) is connected to the second port of the four-way switching valve (23) by the gas pipe (27), and the other end is connected to the expansion valve (25) by the liquid pipe (28). Yes. One end of the indoor heat exchanger (26) is connected to the fourth port of the four-way switching valve (23) by the gas pipe (27), and the other end is connected to the expansion valve (25) by the liquid pipe (28). Yes.

  An outdoor fan (29) and an indoor fan (30) are provided in the vicinity of the outdoor heat exchanger (24) and the indoor heat exchanger (26), respectively. The outdoor heat exchanger (24) is configured to exchange heat between the high-temperature refrigerant gas discharged from the compressor with accumulator (22) and outdoor air taken in by the outdoor fan (29). On the other hand, the indoor heat exchanger (26) is configured to exchange heat between the two-phase refrigerant decompressed by the expansion valve (25) and the indoor air taken in by the indoor fan (30).

  The expansion valve (25) is an electric expansion valve whose opening degree is adjustable. The four-way selector valve (23) includes a first state (state indicated by a solid line in FIG. 3) in which the first port and the second port communicate and the third port and the fourth port communicate, It is configured to switch to a second state (state indicated by a broken line in FIG. 3) in which the four ports communicate and the second port and the third port communicate. That is, in the refrigerant circuit (20), when the four-way switching valve (23) is in the first state, the refrigerant circulates in the cooling cycle (the direction indicated by the solid line arrow in FIG. 3), and the outdoor heat exchanger (24) As the condenser, the indoor heat exchanger (26) functions as an evaporator. In the refrigerant circuit (20), when the four-way selector valve (23) is in the second state, the refrigerant circulates in the heating cycle (in the direction indicated by the broken arrow in FIG. 3), and the outdoor heat exchanger (24) As the evaporator, the indoor heat exchanger (26) functions as a condenser.

-Composition of vacuum insulation-
Next, the structure of the vacuum heat insulating material (1) that is a feature of the present invention will be described. FIG. 1 shows a cross-sectional view of a vacuum heat insulating material (1) in the present embodiment, and FIG. 2 shows a cross-sectional view of a conventional vacuum heat insulating material (1). In addition, the arrow of FIG.1 and FIG.2 has shown the force pushed from the outside by atmospheric pressure.

  As shown in FIG. 1, the vacuum heat insulating material (1) of this embodiment includes glass wool (core material) (4) and a composite laminate film (outer packaging member) (2) of metal foil and resin. Glass wool (4) is enclosed in the sealed space (3) formed in (2). Here, the pressure in the sealed space (3) is kept lower than the atmospheric pressure.

  The vacuum degree (degree of negative pressure) in the sealed space (3) of the vacuum heat insulating material (1) in the present embodiment is set lower than that of the conventional vacuum heat insulating material (1). Therefore, as can be seen from FIGS. 1 and 2, the vacuum heat insulating material (1) of the present embodiment has a smaller force pushed from the outside at atmospheric pressure than the conventional one. It is wider than the conventional vacuum heat insulating material (1), and the thickness of the vacuum heat insulating material (1) is thicker. Moreover, since the sealed space (3) is wider than the conventional vacuum heat insulating material (1), the contact area between the glass wool (4) and the composite laminate film (2) is reduced, and the vacuum heat insulating material (1) It is softer than.

  Note that the degree of vacuum in the sealed space (3) of the vacuum heat insulating material (1) in this embodiment can add a sound insulation performance with a transmission loss of 20 dBA or more to the vacuum heat insulating material (1). The value has been adjusted.

-Operation of air conditioner-
Next, the operation of the air conditioner (10) will be described. The air conditioner (10) is configured to be switchable between a cooling operation and a heating operation.

  First, in the cooling operation, the four-way switching valve (23) is set to the first state in the refrigerant circuit (20). When the compressor with accumulator (22) is driven, the high-temperature and high-pressure refrigerant discharged from the compressor with accumulator (22) into the discharge pipe (22b) flows to the outdoor heat exchanger (24) to the outdoor air. It dissipates heat and condenses. The condensed refrigerant is decompressed by the expansion valve (25), then flows into the indoor heat exchanger (26), absorbs heat from the indoor air, and evaporates. The evaporated refrigerant is sucked into the accumulator-equipped compressor (22) through the suction pipe (22a), and this circulation is repeated.

  In the heating operation, the four-way switching valve (23) is set to the second state in the refrigerant circuit (20). When the compressor with accumulator (22) is driven, the high-temperature and high-pressure refrigerant of the compressor with accumulator (22) flows to the indoor heat exchanger (26), dissipates heat to the indoor air, and condenses. The condensed refrigerant is depressurized by the expansion valve (25), then flows to the outdoor heat exchanger (24), absorbs heat from the outdoor air, and evaporates. The evaporated refrigerant is sucked into the accumulator-equipped compressor (22) through the accumulator (21b) and the suction pipe (22a), and this circulation is repeated.

-Action by vacuum insulation-
In the operation described above, the compressor (21a) constituting the compressor with accumulator (22) emits an operation sound from the inside, and the compressor (21a) itself is in a high temperature state, and the compressor (21a) Dissipate heat from the surface.

  Heat generated from the surface of the compressor (21a) passes through the sound absorbing material (7) and is insulated by the vacuum heat insulating material (1). On the other hand, the operation sound emitted by the compressor (21a) is absorbed by the sound absorbing material (7). And the sound which was not absorbed by the said sound-absorbing material (7) is sound-insulated by the said vacuum heat insulating material (1). Here, in the vacuum heat insulating material (1), by adjusting the degree of vacuum in the sealed space (3), a sound insulation performance of sound transmission loss of 20 dBA or more passing through the vacuum heat insulating material (1) is added. Therefore, the sound that has not been absorbed by the sound absorbing material (7) is reliably insulated.

-Effect of the embodiment-
According to this embodiment, in the said vacuum heat insulating material (1), the sound insulation performance whose transmission loss is 20 dBA or more can be added by adjusting the vacuum degree of sealed space (3). Then, by covering the outer surface of the compressor with accumulator (22) with the vacuum heat insulating material (1) to which the sound insulation performance is added, the compressor with accumulator (22) can be reliably insulated and sound-insulated simultaneously.

<< Other Embodiments >>
About the said embodiment, it is good also as following structures.

  In the said embodiment, although the vacuum heat insulating material (1) and the soundproof material (7) are provided with respect to the compressor (22) with an accumulator, sound insulation performance is added to this vacuum heat insulating material (1). Therefore, the sound insulating material (7) may be omitted and only the vacuum heat insulating material (1) may be provided.

  Moreover, in the said embodiment, the vacuum degree of the sealed space (3) in a vacuum heat insulating material (1) can add the sound insulation performance whose transmission loss is 20 dBA or more with respect to this vacuum heat insulating material (1). Although it is set to a value, it is particularly preferable to adjust to a value that can add sound insulation performance with a transmission loss of 20 dBA or more for a sound having a frequency of 3 kHz or more and 20 kHz or less. In this case, it is possible to perform sound insulation by limiting to sounds in a region uncomfortable with the human body.

  In addition, the degree of vacuum of the sealed space (3) in the vacuum heat insulating material (1) is the heat insulating performance with a thermal conductivity of 0.1 W / mK or less, and a transmission loss of 20 dBA or higher. The sound insulation performance may be adjusted to a value that can be added. In this case, the sound insulation performance can be improved while ensuring the heat insulation performance of the vacuum heat insulating material (1).

  Moreover, in the said embodiment, although the vacuum degree of sealed space (3) is prescribed | regulated as a setting parameter which sets the desired permeation | transmission loss to the said vacuum heat insulating material (1), it does not restrict to this but sealed space (3 The filling rate of the core material (4) relative to In short, any setting parameter may be used as long as the transmission loss of the vacuum heat insulating material (1) can be changed.

  Moreover, in the said embodiment, although glass wool (4) is used as a core material (4) of a vacuum heat insulating material (1), it is not necessary to be limited to this, For example, a silica, a polystyrene, or a polyurethane may be sufficient. . Further, the outer packaging member (2) of the vacuum heat insulating material (1) is not limited to the composite laminate film (2) of metal foil and resin.

  Moreover, although the said embodiment demonstrated the case where the vacuum heat insulating material (1) was used for the compressor (22) with an accumulator, it does not restrict to this but emits a sound and heat | fever-generates to comparatively high temperature (for example, engine) Thus, any sound insulation and heat insulation may be applied. In addition, the present invention is not limited to use in the compressor (22) with an accumulator of the air conditioner (10), but may be used in a compressor of another refrigeration apparatus (for example, a refrigerator).

  In addition, the above embodiment is an essentially preferable illustration, Comprising: It does not intend restrict | limiting the range of this invention, its application thing, or its use.

  As described above, the present invention is useful for the vacuum heat insulating material and the compressor provided with the vacuum heat insulating material.

Sectional drawing of the vacuum heat insulating material which concerns on this embodiment is shown. The sectional view of the conventional vacuum heat insulating material is shown. The refrigerant circuit diagram of an air conditioning apparatus is shown. It is a longitudinal cross-sectional view of the compressor with an accumulator provided with the vacuum heat insulating material which concerns on this embodiment. It is a cross-sectional view of the compressor with an accumulator provided with the vacuum heat insulating material which concerns on this embodiment.

Explanation of symbols

1 Vacuum insulation
2 Composite laminate film (outer packaging)
3 Sealed space
4 Glass wool (core material)
8a Outer tube
8b Lid
10 Air conditioner
20 Refrigerant circuit
21a scroll compressor
21b Accumulator
22 Compressor with accumulator

Claims (4)

A vacuum heat insulating material having a core material (4) made of a heat insulating material and an outer packaging member (2) in which a sealed space (3) for sealing the core material (4) at a pressure lower than atmospheric pressure is formed,
A vacuum heat insulating material, wherein transmission loss of sound passing from one surface of the outer packaging member (2) including the core material (4) to the other surface is set to 20 dBA or more. In claim 1,
A vacuum heat insulating material characterized in that a transmission loss for a sound having a frequency of 3 kHz or more and 20 kHz or less is set to 20 dBA or more. In claim 1 or 2,
The degree of vacuum of the sealed space (3) so that the outer casing member (2) including the core material (4) has a thermal conductivity of 0.1 W / mK or less and the transmission loss is 20 dBA or more. The vacuum heat insulating material characterized by being set. A compressor in which the outer peripheral surface of the casing is covered with a heat insulating material,
The said heat insulating material is comprised with the vacuum heat insulating material as described in any one of Claim 1 to 3, The compressor characterized by the above-mentioned.

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