JPH03994A - Closed type compressor and manufacture thereof and refregerator using same - Google Patents

Abstract

PURPOSE:To increase the heat radiation area of a closed case so as to improve the effect by coating the outer face of the case with a paint in which with heat discharge pieces are mixed to provide the heat discharge means comprising the coated film with uneveness. CONSTITUTION:A closed compressor has in its closed case 3 a motor element, a compression element driven thereby, and oil therefor. The outer surface of the case 3 is coated with a paint 5 mixed with metal chips 4 to make the sur face rough with uneveness. Namely, the heat radiating means comprising the coated film with the uneveness on the outer surface of the closed case 3. The coated paint 5 where the heat radiation chips 4 of 30 - 70 capacity % is mixed in as the heat radiation means is applied and hardened, thereby the film of which heat radiation chips protrude on the coated face is formed. It is thus possible for the chips 4 to serve as a radiation fin and increase the heat radia tion area of the case 3.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a hermetic compressor for use in refrigerators such as electric refrigerators and air conditioners, a manufacturing method thereof, and a refrigerator using the same.

[Conventional technology]

Refrigerator compressors have recently become smaller and hermetically sealed, and resolving the loss of efficiency due to temperature rise has become an important issue, and various proposals have been made to effectively release heat to the outside. . For example, applying paint with high heat radiation to the outer surface of the compressor case, covering it with other ceramics or porous coatings, or aiming at both soundproofing and heat dissipation effects is the first N. Covered with a vibration absorbing layer made of a melamine-based synthetic resin film, the second
The layer may be a double layer including a heat dissipation layer formed by laminating metal pieces in a random direction using an adhesive. As related to this type of compressor, for example, JP-A-60
-150487 and Utility Model Application Publication No. 53-113406.

[Problem to be solved by the invention]

By forming a coating layer with heat dissipation effect as described above on the surface of the compressor case, it is certainly effective to some extent, but it needs to be further improved in practical terms, and when forming the coating layer, rust prevention Countermeasures are also necessary.

In other words, when laminating and fixing metal pieces such as aluminum to the case surface with resin, the resin is generally applied to the case surface, the metal pieces are scattered while the coating is wet, and the metal pieces are left to adhere. By curing the film, the metal piece is fixed to the case surface.

Therefore, since the metal pieces are only partially fixed with resin, there is a problem that the adhesion is not strong enough and they tend to peel off, and since most of the metal pieces are exposed, they are prone to rust. Ta.

The present invention aims to solve such problems, and its first purpose is to provide an improved hermetic compressor with sufficient heat dissipation effect and high reliability, and its second purpose is to provide a method for manufacturing the compressor. A third object is to provide a refrigerator equipped with such a compressor.

[Means to solve the problem]

(1) A hermetic compressor comprising an electric element, a compression element driven by the electric element, and compressor oil housed in a hermetically sealed case, the outer surface of the hermetically sealed case being A heat dissipation means consisting of a coating film having an uneven shape is provided, and as the heat dissipation means, at least a part of the heat dissipation strips are coated on the coated film surface by applying and curing a paint mixed with 30 to 70% by volume of heat dissipation pieces. (2) The heat dissipating piece is made of at least one of metal, glass fiber, graphite, sand, and ceramics, and the paint constituting the coating film is Chijimi paint, Hammertone paint,
By the hermetic compressor according to (1) above, which is made of any one kind of paint selected from the group consisting of a leather tone paint and a urethane resin paint blended with resin beads or modified rubber beads, and (3) made of the metal mentioned above. This is achieved by the hermetic compressor described in (2) above, in which the heat dissipation piece includes at least one metal selected from the group consisting of copper, aluminum, and iron.

Note that the above-mentioned bubbly paint uses tung oil to make the painted surface uneven in the shape of chili peppers. In addition, hammer tone paints are mainly composed of melamine resin or styrenated alkyd resin, and create a hammer-marked painted surface.
Furthermore, the leather tone paint is one that provides a leather-like painted surface mainly made of vinyl resin.

(4) The hermetic compressor has an electric element, a compression element driven by the electric element, and compressor oil housed in the airtight case. 30 to 70% by volume of any type of paint selected from the group consisting of paint, hammer tone paint, leather tone paint, and urethane resin paint blended with resin beads or modified rubber beads.
A method for manufacturing a hermetic compressor comprising the steps of: applying a paint mixed with a heat dissipating piece; and curing the coating film formed by the application; and (5) containing the heat dissipating piece mixed in. This is achieved by the method for manufacturing a hermetic compressor described in (4) above, in which spray coating is performed as the step of applying the paint.

The third object is as follows: (6) A refrigerator in which a refrigeration cycle is constructed by sequentially connecting at least a condenser, a pressure reducing device, and an evaporator between a discharge pipe and a suction pipe of a hermetic compressor, More specifically, by a refrigerator in which the hermetic compressor is the hermetic compressor described in (1), (2), or (3) above.

(7) With the refrigerator equipped with the refrigerator described in (6) above,
and (8) achieved by an air conditioner equipped with the refrigerator described in (6) above.

[Effect]

The heat balance of the compressor is expressed by the following general formula.

G-h; + 0.86W = K5As(Ts-
Ta) 10-h o -(],) However, Ks is the heat transfer coefficient of the case surface (Kcal/m2h'C), As is the case surface area (m2), Ts is the case surface temperature ('C), T
a is the ambient outside temperature (℃), G is the refrigerant flow rate (kg/h),
h, is the enthalpy of the compressor suction gas (Kcal/kg
), ho is the enthalpy of the discharged refrigerant (Kcal/kg),
W indicates compressor input (w), respectively.

The left side of equation (1) is the amount of heat input, and the right side is the amount of heat released.

Generally, in natural cooling (when there is no forced cooling),
Ks is about 10 KcaL/m''h'C, but due to the fin effect of the heat dissipation piece fixed to the outer surface of the case with paint, the heat transfer coefficient Ks apparently increases by 2 to 3 times. Since the amount of heat does not change and is almost constant, the case surface temperature Ts decreases, the discharge gas enthalpy h0 also moves in the direction of decreasing, and the discharge gas temperature also decreases. It is possible to lower the temperature of the compressor, electric element, and even the refrigerating machine oil accumulated in the sealed case, and as a result, it is possible to prevent abnormal overheating of the compressor. As mentioned above, the amount is 30% by volume relative to the paint.
% to 70% is preferred. If it is less than 30%, a sufficient heat dissipation effect cannot be obtained, and if it is more than 70%, sufficient adhesive fixation cannot be obtained, which is not preferable.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic explanatory diagram of the device schematically showing a vertical section of the hermetic compressor 14 and the refrigeration cycle of the refrigerator connected to it, and FIG. 2(a) is a cross-sectional view of the compressor shown in FIG. 1. the face,
FIG. 2(b) shows an enlarged partial sectional view of section B of the closed case 3 of the compressor 14.

To explain the overall configuration with reference to FIG. 1, the hermetic compressor 14
The surface of the sealed case 3 is coated with paint 5 mixed with metal pieces 4.
is coated, and the surface has a roughened shape. Inside the closed case 3, an electric element 2 and a compression element 1 driven by the electric element 2 are housed.

The compressor configured as described above has a discharge pipe 9 connected to a condenser 11.
．． Together with the pressure reducing device 12 and the evaporator 13, it constitutes an annular refrigerator refrigeration cycle.

Referring to FIG. 2, we will explain in detail how the metal piece 4 is fixed to the sealed case 3 by the paint 5.The entire surface of the metal piece 4 is covered with resin paint, and a part of it protrudes outward and has a protrusion. This forms the unevenness on the surface of the case 3.

The other part is firmly adhered and fixed in the resin coating film 5. Therefore, since the metal pieces are stably planted on the case surface, there is no problem of peeling, and since the surfaces of the protrusions are covered with a coating film, the structure is resistant to rust. The coating surface having such a surface unevenness structure was formed by dispersing and mixing a predetermined amount of metal pieces into the coating liquid in advance, and spraying this coating onto the case surface.

Returning to FIG. 1 again, to explain the operation, the discharged refrigerant gas discharged from the compressor element 1 passes from the inside of the sealed case 3 through the discharge pipe 9 to the condenser 11, the pressure reducing device 12, and the evaporator 1.
3 and is sucked into the compression element 1 again. The inside of the sealed case 3 is filled with high temperature discharged refrigerant gas.
Furthermore, heat generated by the electric element 2 is added, and the surface temperature becomes high. In a sealed case with a smooth painted surface coated with conventional paint, the surface heat transfer coefficient Ks is as small as approximately 10 Kcal/m2h °C in the case of natural cooling, and the amount of heat dissipated from the sealed case surface is also 50 to 60 Kcal/h. Because of its small size, the surface temperature of the sealed case is as high as about 90 to 100°C.

On the other hand, in the sealed case 3 coated with the paint 5 mixed with the metal pieces 4 of the present invention, the painted surface is made uneven to increase the heat dissipation area, and since the individual metal pieces 4 play the role of heat dissipation fins, the sealed case 3 is sealed. The heat transfer coefficient Ks of the outer surface of case 3 is approximately 2~
The surface temperature of the sealed case 3 is reduced by about 5 to 10 deg because the temperature is significantly improved to about 20 to 30 Kcal/m''h'C, which is three times as much, and the amount of heat dissipated is also increased.

As a result, the compression element 1 and the electric element 2 inside the closed case 3
, Furthermore, the temperature of the discharged refrigerant gas in the sealed case 3 is also 1.
It decreases by about 5 degrees. Therefore, during refrigerant compression, heating from the compression element 1 to the refrigerant is suppressed, which has the effect of approaching the most efficient isothermal compression and reduces the amount of work required for refrigerant gas compression. Moreover, when the above-mentioned refrigeration cycle is used as an air conditioner, the compression element 1
As the temperature decreases, the weight of refrigerant sucked will increase, and an increase in cooling capacity is expected. As a result, the efficiency of the compressor is
This will increase by approximately 3%. At the same time, the refrigerating machine oil 6 itself is also prevented from becoming high temperature, and stable lubrication performance can be obtained.

In this embodiment, a metal piece is used as a heat dissipation piece, but it goes without saying that other materials such as glass fiber, graphite, sand, ceramics, etc. may be mixed into the paint.

〔effect〕

As described above, according to the present invention, by applying a paint mixed with heat dissipation pieces to the case of a hermetic compressor, the surface can be roughened into an uneven shape, and the convex portions can serve as heat dissipation fins. Moreover, since the heat dissipating pieces forming the convex portions are firmly adhered to the coating film, there is no problem of peeling, and a hermetic compressor with high reliability and a large heat dissipation effect can be realized. As described above, according to the present invention, the heat dissipation ability of the case is greatly improved, so the temperature rise of the compression element, the moving element, and the refrigerating machine oil is suppressed, the compression work in the compressor is reduced, and the weight of the refrigerant sucked is reduced. It brings about an excellent effect of preventing deterioration of refrigerating machine oil due to high temperatures.

[Brief explanation of drawings]

FIG. 1 is a schematic explanatory diagram of a refrigerator, schematically showing the longitudinal cross-sectional structure of a hermetic compressor and the refrigeration cycle connected thereto, showing one embodiment of the present invention, and FIG. The cross-sectional structure of the machine is shown, and FIG. 2(b) is an enlarged sectional view of section B in FIG. 2(a). 1... Compression element 3... Sealed case 5... Paint 9... Discharge pipe 11... Condenser 13... Evaporator

Claims (1)

[Claims] 1. A hermetic compressor comprising an electric element, a compression element driven by the electric element, and compressor oil housed in a hermetically sealed case, wherein the external surface of the hermetically sealed case is uneven. A heat dissipation means consisting of a paint film having a shape is provided, and as the heat dissipation means, at least a part of the heat dissipation pieces protrudes from the coating surface by applying and curing a paint mixed with 30 to 70% by volume of heat dissipation pieces. A hermetic compressor made by forming a coating film. 2. The heat dissipating piece is made of at least one of metal, glass fiber, graphite, sand, and ceramics, and the paint that makes up the coating film is a combination of buoyant paint, hammer tone paint, leather tone paint, and resin beads or modified rubber beads. 2. The hermetic compressor according to claim 1, wherein the hermetic compressor is made of any one kind of paint selected from the group consisting of urethane resin paints. 3. The hermetic compressor according to claim 2, wherein the heat dissipation piece made of metal contains at least one metal selected from the group consisting of copper, aluminum, and iron. 4. A hermetic compressor comprising an electric element, a compression element driven by the electric element, and compressor oil housed in a hermetically sealed case, and the outer surface of the hermetically sealed case is coated with buoyant paint, hammer tone paint, or leather tone paint. A step of applying a paint in which 30 to 70% by volume of a heat dissipating piece is mixed into any one kind of paint selected from the group consisting of a paint and a urethane resin paint blended with resin beads or modified rubber beads; A method for manufacturing a hermetic compressor, comprising a step of curing a coating film. 5. As a step of applying the paint mixed with the heat dissipation piece,
5. The method for manufacturing a hermetic compressor according to claim 4, wherein spray coating is performed. 6. A refrigerating machine in which a refrigeration cycle is constructed by sequentially connecting at least a condenser, a pressure reducing device, and an evaporator between a discharge pipe and a suction pipe of the hermetic compressor, wherein the hermetic compressor according to claim 1 A refrigerator comprising the hermetic compressor according to , 2 or 3. 7. A refrigerator comprising the refrigerator according to claim 6. 8. An air conditioner comprising the refrigerator according to claim 6.