JP2010096116A - Casing of compressor - Google Patents

Abstract

A compressor casing having an extremely high pressure strength while being lightweight is provided.
SOLUTION: A metal inner shell member 1 and an outer shell member 2 composed of a fiber reinforcing layer covering the outer surface of the inner shell member 1 are used, and carbon fibers are used as reinforcing fibers. According to such a configuration, the light weight and high strength, which are the characteristics of the fiber reinforced layer, and the weight reduction by reducing the plate thickness of the inner shell member 1, combined with the light and high strength CO2 refrigerant. A casing that matches the required performance of the compressor casing applied to the refrigeration system to be used can be obtained, and the use of carbon fiber as the reinforcing fiber makes it possible to use glass fiber that is a general reinforcing fiber. In addition, a compressor casing having high strength and high reliability can be obtained.
[Selection] Figure 1

Description

  The present invention relates to a compressor casing applied to a refrigeration system using CO2 refrigerant as a refrigerant.

  Conventionally, a compressor casing applied to a refrigeration system is typically made of steel in the sense of ensuring its pressure resistance (see Patent Document 1).

  However, in recent years, against the background of increasing awareness of environmental protection, in the refrigeration system, it has been attempted to use a natural refrigerant, particularly a CO2 refrigerant, as a refrigerant instead of the conventionally used flon refrigerant (Patent Document). 2).

  However, when the CO2 refrigerant is used in this way, the CO2 refrigerant has a low critical temperature, and the refrigeration cycle operation is performed at a high pressure (about 10 MPa) where the high pressure exceeds the critical pressure of the refrigerant. The casing of the machine is required to have extremely high pressure strength.

  In such a case, if it is intended to cope with this extremely high pressure strength with a steel casing as in the prior art, the thickness of the steel plate forming the casing will increase, so that its weight increases, the compressor, The handling of a refrigeration apparatus equipped with this is extremely poor.

  Here, what is considered as the corresponding cable is the use of fiber reinforced plastic having both light weight and high strength. In other words, when manufacturing a sealed container-like casing, the thickness of the steel plate, which is the forming material, is made thinner than the required plate thickness in the case where the required pressure-resistant strength is ensured only with the steel plate to reduce its weight. At the same time, the outer surface side of this steel sheet is covered with a fiber reinforced layer to form a double structure, and the decrease in pressure strength accompanying the thinning of the steel sheet is compensated by the strength of the fiber reinforced layer, so a lightweight and high pressure strength compressor Is to get the casing. Although there is no prior example applied to the casing of the compressor of such a technique, a technique in which a technique for reducing weight and increasing strength using a fiber reinforced layer is applied to a gas cylinder has been proposed (see Patent Document 3). .

JP 2003-262192 A JP 2008-164227 A JP 2005-337272 A

  However, since the technique disclosed in Patent Document 3 is intended for a gas cylinder, the pressure strength required for this is not the ratio of the pressure strength required for the casing of the compressor using the CO2 refrigerant. The compressor casing has a unique structure different from that of the gas cylinder, for example, there are protrusions such as a refrigerant suction side connection pipe and a discharge side connection pipe, and stress concentration tends to occur particularly in the peripheral parts of these protrusions. From the viewpoint of ensuring safety, it is necessary to ensure the strength performance of the peripheral portion of the projection with high reliability. From these, the technology for the gas cylinder is applied to the CO2 refrigerant. It cannot be diverted as it is to the compressor casing.

  Accordingly, the present invention has been made for the purpose of providing a compressor casing having an extremely high pressure strength while being lightweight.

  In the present invention, the following configuration is adopted as a specific means for solving such a problem.

  In 1st invention of this application, in the casing of the compressor applied to the refrigerating system using a CO2 refrigerant | coolant, the outer shell member which consists of a metal inner shell member 1 and the fiber reinforcement layer which covers the outer surface of this inner shell member 1 It is characterized by comprising 2.

  In the second invention of the present application, in the casing of the compressor according to the first invention, the inner shell member 1 is provided with projections 3, 4, 5; It is characterized in that the layer thickness of the outer shell member 2 in the peripheral part is set larger than the layer thickness of the other part.

  According to a third invention of the present application, in the casing of the compressor according to the second invention, the protrusions 3, 4, and 5 are power supply terminals or connecting pipes on the refrigerant suction side and the discharge side. It is a feature.

  In the present invention, the following effects can be obtained.

  (A) According to 1st invention of this application, since it comprises the outer shell member 2 which consists of a metal inner shell member 1 and the fiber reinforcement layer which covers the outer surface of this inner shell member 1, a fiber reinforcement layer The light weight and high strength, which are the characteristics of the above, and the weight reduction by reducing the plate thickness of the inner shell member 1 are combined, and the compressor is applied to a refrigeration system using a CO2 refrigerant that is lightweight and has high strength. A compressor casing that meets the required performance of the casing can be obtained.

  (B) In the second invention of the present application, in addition to the effects described in (a) above, the following specific effects can be obtained. That is, in the present invention, the inner shell member 1 is provided with the projections 3, 4, and 5, and the layer thickness of the outer shell member 2 in the peripheral portion of the projections 3, 4, and 5 is set to other values. Since the thickness is set to be larger than the layer thickness of the part, it is possible to ensure the strength performance of the peripheral portion of the projection, which is particularly prone to stress concentration, with high reliability only by the correspondence on the outer shell member 2 side. it can.

  In addition, in this case, as in the third invention of the present application, the power supply terminal 5, or the refrigerant suction side connection pipe 3 and the discharge side connection pipe 4 are used as the protrusions, and the strength performance improvement target portion By doing so, a compressor casing having high reliability in terms of strength can be obtained.

  Hereinafter, the present invention will be specifically described based on preferred embodiments.

  FIG. 1 shows a casing Z of a compressor according to an embodiment of the present invention. The casing Z constitutes a compressor used for refrigerant compression in an air conditioner using a CO2 refrigerant, and is connected to a body portion Za having a predetermined diameter and one end (upper end) of the body portion Za. An upper end plate portion Zb having a bowl-like shape and a lower end plate portion Zc having a bowl-like shape connected to the other end (lower end) of the body portion Za are provided, and a compressor 51 is provided therein. And the motor 52 are accommodated.

  The casing Z has a double structure including an inner shell member 1 and an outer shell member 2 described below.

"Inner shell member 1"
The inner shell member 1 is formed in a sealed container shape using a metal plate, for example, a steel plate or an aluminum alloy plate, and has an end corresponding to the upper end plate portion Zb at one end of the cylindrical member 11 corresponding to the body portion Za. And the flange member 13 corresponding to the lower end plate part Zc is welded and joined to the other end.

  The suction side connection pipe 3 to which the refrigerant suction pipe 53 is attached and the discharge side connection pipe 4 to which the refrigerant discharge pipe 54 is attached are respectively fixed to the outer peripheral surfaces of the cylindrical member 11 near the upper and lower ends. On the other hand, a power feeding terminal 5 is provided at the center of the top surface of the upper bowl-shaped member 12. Each of the suction side connection pipe 3, the discharge side connection pipe 4, and the terminal 5 corresponds to a “projection” in the claims.

  The cylindrical member 11 and the pair of upper and lower bowl-shaped members 12 and 13 are both thin plate members (in the case of a steel plate, a plate thickness of about 2.5 mm). It is made thinner than about 5 mm).

  1 and 3, the discharge side connecting pipe 4 has a tubular shape into which the discharge pipe 54 is fitted, and one end 4a thereof is welded and fixed to the opening 33 portion on the cylindrical member 11 side. As a result, the cylindrical member 11 is integrated.

  In addition, since the structure of the said suction side connection pipe 3 is the same as that of the said discharge side connection pipe 4, the corresponding description about this discharge side connection pipe 4 is used, and description here is abbreviate | omitted.

As shown in the enlarged view in FIGS. 1 and 2, the terminal 5 is inserted into the opening 31 provided at the central portion of the top of the bowl-shaped member 12, and a fixed portion 5a having a thick disk-like shape is inserted, And this fixing | fixed part 5a is integrated with this hook-shaped member 12 by welding and fixing to the said hook-shaped member 12 side.
"Outer shell member 2"
The outer shell member 2 is composed of a fiber reinforced layer, integrally covers the outer peripheral surface of the inner shell member 1, and constitutes the casing Z together with the inner shell member 1. As the reinforcing fiber yarn, carbon fiber yarn, glass fiber yarn, organic high modulus fiber (for example, polyamide fiber yarn) and the like can be widely applied. In particular, a high-strength carbon fiber yarn is suitable. The resin impregnated in the reinforcing fiber yarn includes thermosetting resins such as epoxy resin, unsaturated polyester resin, vinyl ester resin, phenol resin, polyamide resin, polyethylene terephthalate resin, ABS resin, polyether ketone resin. Thermoplastic resins such as polyphenylene sulfide resin, poly-4-methylpentene-1 resin, and polypropylene resin are preferred.

  Here, the outer shell member 2 is formed by a FW method (filament) in which the reinforcing fiber (carbon fiber) impregnated with resin is wound around the outer peripheral surface of the inner shell member 1 while applying tension.・ The winding method is adopted. Then, as shown by a two-dot chain line in FIG. 1, the periphery of the discharge side connecting pipe 4 is wound around the portion corresponding to the cylindrical member 11 of the inner shell member 1 as indicated by reference numerals 9A and 9B. However, a hoop layer is formed by hoop winding around the inner shell member 1 around which the reinforcing fiber is wound. In addition, as indicated by reference numeral 9C, the hook-shaped member 12 is wound around the fixed portion 5a of the terminal 5 while rotating around the axial direction with respect to the inner shell member 1 (that is, the above-described portion). A helical layer is formed by helical winding in which reinforcing fibers are wound so as to straddle the bowl-shaped member 12 and the bowl-shaped member 13 (in the axial direction of the inner shell member 1). Therefore, the cylindrical member 11 has a structure in which a hoop layer and a helical layer are formed in a polymerized state.

  And in this case, the peripheral part 2a of the terminal 5 of the outer shell member 2 has a layer thickness of the fiber reinforced layer by increasing the number of wrapping reinforcing fibers and the number of wrapping layers more than other parts. It is formed to be larger than the layer thickness of other portions.

  Further, also in the peripheral portion 2b of the discharge side connecting pipe 4 of the outer shell member 2, the number of reinforcing fibers wound around the peripheral portion 2b and the number of wound layers are larger than those in the other portions, similarly to the terminal 5 side. By doing so, the layer thickness of the fiber reinforced layer is formed to be larger than the layer thickness of other portions.

  In the peripheral portion 2c of the suction side connecting pipe 3 of the outer shell member 2 as well as the peripheral portion 2b of the discharge side connecting pipe 4, the thickness of the fiber reinforced layer is the other layer. It is formed to be larger than the thickness.

"Casing Z"
As described above, the casing Z composed of the inner shell member 1 and the outer shell member 2 covering the outer peripheral surface of the outer shell member 2 has a property of being lightweight and having high strength. Although the inner shell member 1 has a thin structure, it has both light weight and high pressure resistance.

  By the way, the suction side connecting pipe 3, the discharge side connecting pipe 4 and the terminal 5 are protrusions protruding from the inner shell member 1 and are portions where stress concentration is likely to occur. As described above, performance is required, and it is necessary to ensure this strength performance stably and with high reliability.

  In response to such a demand, in the casing Z of this embodiment, when the outer shell member 2 is formed on the outer peripheral side of the inner shell member 1, the suction side connection pipe 3 and the discharge side connection pipe 4 are formed as described above. And in the peripheral part of the terminal 5, the layer thickness of the fiber reinforced layer is made larger than the layer thickness of the other parts, thereby the peripheral part of the suction side connecting pipe 3, the discharge side connecting pipe 4 and the terminal 5 The strength performance at is higher than other parts.

  As a result, even if the peripheral portion of each of the portions 3, 4 and 5 is a portion where stress concentration is likely to occur, the periphery of the respective portions 3, 4 and 5 is improved by increasing the strength of the fiber reinforced layer. The strength performance of the part is reliably realized under high reliability, and as a result, a compressor casing having high reliability in terms of strength can be obtained.

It is sectional drawing which shows the structure of the casing of the compressor which concerns on embodiment of this invention. It is an enlarged view of the II section of FIG. It is an enlarged view of the III section of FIG.

Explanation of symbols

1 .. Inner shell member 2 .. Outer shell member 3 .. Suction side connection pipe 4 .. Discharge side connection pipe 5 .. Terminal 9A to 9E .. Carbon fiber 11 .. Cylindrical member 12.・ Compressor 52 ・ ・ Motor 53 ・ ・ Suction pipe 54 ・ ・ Discharge pipe Z ・ ・ Compressor casing

Claims (3)

A compressor casing applied to a refrigeration system using a CO2 refrigerant,
A compressor casing comprising a metal inner shell member (1) and an outer shell member (2) comprising a fiber reinforced layer covering the outer surface of the inner shell member (1). In claim 1,
The inner shell member (1) is provided with projections (3, 4, 5), and the layer thickness of the outer shell member (2) at the peripheral portion of the projections (3,4, 5). Is set to be larger than the layer thickness of the other part. In claim 2,
The compressor casing, wherein the protrusions (3, 4, 5) are power supply terminals or refrigerant suction side and discharge side connection pipes.

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