JP2012215126A - Compressor and anticorrosion treatment method for compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compressor that is improved in corrosion resistance, and to provide an anticorrosion treatment method for the compressor.SOLUTION: The compressor includes: a housing that is constituted of metal members divided into at least two and in which each of the metal members mutually joins to form a space inside; a seal member 23 that is arranged in a joint where each of the metal members mutually joins to define the space as a sealed space S; a height adjusting member 5 that has a surface including sacrificial protection effect against a material of the housing and lies between the joints positioned opposite to the sealed space of the seal member 23; and a compression mechanism that is accommodated inside the housing and compresses fluid in the sealed space S.

Description

  The present invention relates to a compressor and a corrosion prevention method for the compressor.

  In a compressor used for an air conditioner, a compression mechanism is accommodated in a sealed space in a housing, and the refrigerant gas taken into the sealed space is compressed. The housing includes a front housing and a rear housing, and a combined space is formed by combining these and then connecting them with a plurality of bolts (see, for example, Patent Document 1). A joint portion between the front housing and the rear housing is configured to be sealed by an O-ring to keep the sealed space in a sealed state.

Japanese Patent Laying-Open No. 2005-244875 (paragraph [0013], FIG. 1)

  When a compressor such as that described in Patent Document 1 is used in a vehicle air conditioner, the corrosion resistance when the vehicle travels in a place where a snow melting agent (calcium chloride) is distributed or on the coast must be considered. Don't be. For example, if the housings 21 and 22 near the O-ring are corroded and dissolved as shown in the region X in FIG. 5, the sealed state by the O-seal cannot be maintained, and the refrigerant gas may leak and the compression capacity may be reduced. is there. For this reason, the compressor needs to withstand a predetermined test time in the salt spray durability test. In recent years, further improvement in corrosion resistance in the above test has been eagerly desired.

  This invention is made | formed in view of such a situation, Comprising: It aims at providing the corrosion prevention processing method of the compressor which can improve corrosion resistance, and a compressor.

  In order to solve the above-mentioned problems, the present invention is composed of a metal member divided into at least two parts, the metal members joining each other to form a space therein, and the metal members A sealing member that is disposed in a joining portion that joins the sealing member, and has a surface having a sacrificial anticorrosive action on the material of the housing, and is located on the opposite side to the space of the sealing member. Provided is a compressor comprising a height adjusting member interposed in the joint portion, and a compressor housed in the housing and capable of compressing a fluid in the sealed space.

According to the above invention, the surface of the height adjusting member has a sacrificial anticorrosive action on the material of the housing. Therefore, when dust or salt water enters the joint from the outside, the surface of the height adjusting member is preferentially corroded over the housing. Thereby, the progress of corrosion of the housing around the joint where the seal member is disposed can be delayed.
Further, the height adjusting member is located closer to the outer periphery of the housing than the seal member. That is, the height adjusting member is located closer to the entrance of dust or salt water than the seal member. With the above-described configuration, the preferentially corroded height adjusting member expands in volume, fills the gap near the entrance, and delays corrosion of the housing around the seal member.

  1 aspect of the said invention WHEREIN: It is preferable to further provide the elastic sealing member which an end part is connected to the edge part on the opposite side to the said sealing member of the said height adjustment member, and interposes in the said junction part.

  According to one aspect of the invention, the elastic seal member is disposed outside the height adjusting member. By sandwiching the elastic seal member between the metal members constituting the housing, the pressure can be uniformly distributed to the joint surface with each metal member. Accordingly, it is possible to prevent salt water and the like from entering the housing from the outside.

In one aspect of the invention, at least a surface of the joint located outside the seal member that contacts the height adjusting member is covered with a material having a sacrificial anticorrosive action on the material of the housing. Good.
In one aspect of the invention, at least a surface of the joint located outside the seal member that contacts the elastic seal member is covered with a film having a sacrificial anticorrosive action on the material of the housing. Also good.

  By adopting the above configuration, corrosion can be preferentially generated near the outer periphery of the housing of the joint, that is, on the inlet side of salt water or the like, so that the progress of corrosion of the housing around the seal member can be delayed. .

  In addition, the present invention includes a housing that is composed of members divided into at least two parts, the members are joined to each other, and a space is formed therein, and the fluid in the space is compressed in the housing. An anticorrosion treatment method for a compressor including a compression mechanism portion accommodated therein, wherein a sealing member is disposed in a joint portion where the respective members are joined to each other, and the space is a hermetically sealed space. An anticorrosion treatment method for a compressor is provided in which a height adjusting member having a surface having a sacrificial anticorrosive action is interposed in the joint portion outside the seal member.

According to the said invention, since the surface of a height adjustment member can be corroded preferentially rather than a housing, progress of corrosion of the housing around the junction part by which the sealing member is arrange | positioned can be delayed.
Further, the height adjusting member is positioned outside the seal member. That is, the height adjusting member is located closer to the entrance of dust or salt water than the seal member. By setting it as the said structure, the height adjustment member corroded preferentially volume-expands and it becomes possible to prevent intrusion of salt water etc. physically.

  1 aspect of the said invention WHEREIN: It is preferable to connect an elastic sealing member to the said sealing member side and the opposite end part of the said height adjustment member, and to interpose in the said junction part.

  According to one aspect of the invention, the elastic seal member can be uniformly distributed to the joint surface with each metal member by being sandwiched between the metal members constituting the housing. Accordingly, it is possible to prevent salt water and the like from entering the housing from the outside.

1 aspect of the said invention WHEREIN: When the surface which contacts the said height adjustment member of the said junction part located outside the said sealing member at least with the material which provided the sacrificial anti-corrosion action with respect to the material of the said housing is covered. good.
In one aspect of the invention, at least a surface of the joint located outside the seal member and contacting the elastic seal member is covered with a film having a sacrificial anticorrosive action on the material of the housing. Also good.

With this configuration, corrosion can be preferentially generated on the outside of the housing, that is, on the inlet side of salt water or the like, so that the progress of corrosion of the housing around the seal member portion can be delayed.

  According to the present invention, by disposing the height adjusting member having a sacrificial anticorrosive action at the joint portion of the housing, the height adjusting member is preferentially corroded and the corrosion of the housing member around the seal member can be delayed. it can. As a result, it becomes possible to maintain the hermeticity in the housing for a longer time, and it is possible to maintain the function of preventing the leakage of refrigerant gas to the outside and the entry of dust and the like into the housing.

It is sectional drawing of the compressor which concerns on 1st Embodiment. It is an enlarged view of the junction part of the front housing and rear housing of the compressor which concerns on 1st Embodiment. It is a figure which shows the example of arrangement | positioning of the elastic seal member integrated with the height adjustment member in 2nd Embodiment. It is a figure which illustrates the range which coat | covers the sacrificial anticorrosion film | membrane in 3rd Embodiment. It is an enlarged view of the junction part of the front housing and rear housing in the conventional compressor.

  Hereinafter, an embodiment according to the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited by this embodiment. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same.

(First embodiment)
As shown in FIG. 1, the compressor 1 of the present embodiment is configured as a scroll compressor. In the compressor 1, a compression mechanism 3 is accommodated in a sealed space S in a housing 2.

The housing 2 is made of, for example, an aluminum alloy for die casting mainly composed of aluminum, more specifically, an Al—Si—Cu-based aluminum alloy such as ADC12. The housing 2 is divided into a bottomed cylindrical front housing 21 and a rear housing 22 that closes an opening of the front housing 21. The front housing 21 and the rear housing 22 form a sealed space S by being joined together by tightening bolts or the like.
A joint portion between the front housing 21 and the rear housing 22 is configured to be sealed by a seal member (for example, an O-ring) 23 to keep the sealed space S sealed.

  The compression mechanism unit 3 is provided with a fixed scroll 31 fixed to the rear housing 22 and a turning scroll 32 that revolves around the housing 2 and the fixed scroll 31.

  The fixed scroll 31 includes a substantially disc-shaped end plate 311 and a spiral wall body 312 (hereinafter referred to as a fixed spiral body) standing on the end plate 311. The end plate 311 is fixed to the rear housing 22 by bolts 4. In addition, a discharge port 314 for discharging compressed air to the back side of the end plate 311 opposite to the orbiting scroll 32 is formed in the approximate center of the end plate 311. The fixed spiral body 312 protrudes perpendicularly from the surface of the end plate 311 facing the orbiting scroll 32, and is provided in a shape along a circular involute curve (stretching line). Further, a seal member 313 is provided on the protruding end surface of the fixed spiral body 312.

  Similar to the fixed scroll 31, the orbiting scroll 32 includes a substantially disc-shaped end plate 321 and a spiral wall body 322 erected on the end plate 321 (hereinafter referred to as an orbiting spiral body). Yes. The end plate 321 is supported so that the back surface opposite to the fixed scroll 31 faces the thrust surface 221 that is the inner surface of the front housing 21 so as to be slidable. The swirling spiral body 322 protrudes perpendicularly from the surface of the end plate 321 facing the fixed scroll 31, and is provided in a shape obtained by inverting the shape of the fixed spiral body 312 of the fixed scroll 31 by 180 °. Further, a seal member 323 is provided on the protruding end surface of the swirl spiral body 322.

  The orbiting scroll 32 and the fixed scroll 31 are disposed in the sealed space S of the housing 2 such that the orbiting spiral body 322 faces and meshes with the fixed spiral body 312. In such a state, the seal member 323 of the orbiting scroll 322 is in contact with the surface of the end plate 311 of the fixed scroll 31, and the seal member 313 of the fixed volute 312 is in contact with the end plate 321 of the orbiting scroll 32. It touches the surface. Thus, a pair of compression chambers P defined by the end plate 321, the end plate 311, the orbiting spiral body 322, and the fixed spiral body 312 are formed between the orbiting scroll 32 and the fixed scroll 31.

  The orbiting scroll 32 is configured to revolve with respect to the fixed scroll 31 by a revolution mechanism. The revolution mechanism includes an input shaft 51, a drive pin 52, and a bush 53. The input shaft 51 is supported by a bearing 54 so as to be rotatable around an axis C with respect to the front housing 21 of the housing 2, a distal end 51 a is extended to the outside of the housing 2, and a base end 51 b is in the housing 2. It is arranged in the sealed space S. The input shaft 51 receives rotational power from the outside of the housing 2.

  When the orbiting scroll 32 revolves around the fixed scroll 31, the pair of compression chambers P becomes one at the center portion of the end plate 311 of the fixed scroll 31 while the volume gradually decreases. As a result, the pressure in the compression chamber P increases and the refrigerant gas (fluid) in the chamber is compressed. The compressed refrigerant gas is discharged from the discharge port 314 formed in the end plate 311 of the fixed scroll 31.

  The compressor 1 is not limited to the above-described scroll compressor, and may be a rotary compressor in which the compression mechanism compresses the refrigerant gas (fluid) by the eccentric rotation of the rotor. Further, the compressor 1 may be configured to perform both scroll compression and rotary compression. Furthermore, although the compressor 1 is the structure which inputs the rotational power from the exterior of the housing 2, you may have a drive part (motor etc.) inside the housing 2 (sealed space S).

  In the compressor 1, as shown in FIG. 2, a height adjusting member 5 is interposed between the joint portions of the front housing 21 and the rear housing 22 that constitute the housing 2. The height adjusting member 5 is disposed on the outer peripheral side of the housing 2 relative to the seal member 23, that is, on the side opposite to the sealed space S with respect to the seal member 23. The height adjusting member 5 is in contact with opposing surfaces of the front housing 21 and the rear housing 22.

  The height adjusting member 5 has a rigidity that does not deform when the front housing 21 and the rear housing 22 are joined to each other by fastening the bolts 6 or the like. The height adjusting member 5 is preferably about 10 μm to 500 μm thick. Further, the height adjusting member 5 has a surface having a sacrificial anticorrosive action with respect to the material of the housing 2. “Sacrificial anticorrosion” means that a metal having a higher ionization tendency than that of the base material is brought into contact with the base material, so that the metal having a high ionization tendency is corroded to suppress corrosion of the base material. In the present embodiment, the height adjustment member 5 having a sacrificial anticorrosive action on the housing is formed by configuring the surface of the height adjustment member 5 with a metal having a higher ionization tendency than the housing. For example, when the housing is made of an Al—Si—Cu based aluminum alloy, the surface of the height adjusting member 5 is made of zinc oxide or zinc hydroxide. In the present embodiment, the height adjusting member 5 is obtained by coating the surface 5B of the core material 5A such as SUS by galvanizing.

  Note that the coating method is not limited to the plating process, and may be vapor deposition. Further, the height adjusting member may be made of a single material.

  By providing the height adjusting member as described above on the outer peripheral side of the housing with respect to the seal member 23, the surface 5B of the height adjusting member 5 is sacrificed and the corrosion of the housing around the seal member 23 is delayed. be able to. Further, when the height adjusting member 5 corrodes, the volume expands, so that it is possible to physically suppress the entry of the corrosive elements from the outside. For this reason, it is possible to assist the retention of the sealing performance by the seal member 23 and to maintain the function of preventing leakage of refrigerant gas from the sealed space S in the housing 2 to the outside and intrusion of dust and the like into the housing 2. become.

(Second Embodiment)
The compressor in this embodiment has the same configuration as that of the first embodiment except that an elastic seal member is connected to the height adjustment member.

  The elastic seal member has a dense structure that does not allow liquid to pass therethrough and has elasticity. For example, the elastic seal member is made of natural rubber or synthetic rubber. The elastic seal member is connected to one end of the height adjusting member via an adhesive or an anchor. The thickness of the elastic seal member is preferably about 10 to 30% thicker than the height adjusting member.

  FIG. 3 shows an arrangement example of the elastic seal member integrated with the height adjusting member. The elastic seal member 7 integrated with the height adjustment member 5 is directed so that the height adjustment member 5 faces the seal member 23 side, and the elastic seal member 7 is closer to the outer peripheral side of the housing 2 than the height adjustment member 5 is. It is interposed between the front housing 21 and the rear housing 22.

  The elastic seal member 7 contacts the mutually facing surfaces of the front housing 21 and the rear housing 22. The elastic seal member 7 joins the front housing 21 and the rear housing 22 by tightening the bolts 6 to distribute and seal the pressure uniformly on the joint surface with each housing. Can be suppressed. Even if a corrosive element enters from a gap between the elastic seal member 7 and each housing, the height adjusting member 5 is sacrificially corroded, so that the corrosion of the housing 2 around the seal member 23 is progressed. Can be delayed.

(Third embodiment)
The compressor in this embodiment has the same configuration as that of the first embodiment except that the housing is covered with a sacrificial anticorrosive film made of a material having a sacrificial anticorrosive action.

  The sacrificial anticorrosive film is made of a metal having a greater ionization tendency than the material of the housing 2. The thickness of the sacrificial anticorrosive film is preferably 3 μm to 300 μm. By doing so, it can be realistically formed by the current technology. FIG. 4 illustrates a range in which the sacrificial anticorrosion film 8 is covered. The sacrificial anticorrosive film 8 is provided so as to cover at least the surface that contacts the height adjusting member 5 at the joint between the front housing 21 and the rear housing 22.

  By setting it as the said structure, it becomes possible to delay the progress of corrosion of the housing around the sealing member 23 more.

  Note that this embodiment can also be implemented in combination with the second embodiment. Specifically, the sacrificial anticorrosive film 8 is formed so as to cover at least the elastic seal member at the joint between the front housing 21 and the rear housing 22 or the surface that contacts the integrated height adjusting member 5 and elastic seal member 7. Even if it provides, the same effect can be acquired.

DESCRIPTION OF SYMBOLS 1 Compressor 2 Housing 3 Compression mechanism part 4, 6 Bolt 5 Height adjustment member 5A Core material 5B Surface 7 Elastic seal member 8 Sacrificial anticorrosion film 21 Front housing 22 Rear housing 23 Seal member

Claims (8)

A housing formed of at least two metal members, each of which is joined to each other to form a space therein;
A seal member disposed in a joint portion of the metal members to be joined to each other, and the space being a sealed space;
A height adjusting member that has a surface having a sacrificial anticorrosive action on the material of the housing and is interposed in the joint located on the opposite side of the space of the seal member;
A compression mechanism housed in the housing and capable of compressing the fluid in the sealed space;
With compressor.   2. The compressor according to claim 1, further comprising an elastic seal member having one end connected to an end of the height adjusting member opposite to the seal member and interposed in the joint.   The surface of the joint located on the outer side of the seal member and at least the surface in contact with the height adjusting member is covered with a material having a sacrificial anticorrosive action with respect to the material of the housing. 2. The compressor according to 2.   4. The surface of the joint located outside the seal member, at least the surface that contacts the elastic seal member, is covered with a film having a sacrificial anticorrosive action on the material of the housing. The compressor described in 1. A compression unit comprising a housing divided into at least two parts, each of which is joined to each other to form a space therein, and in which the fluid in the space is compressively accommodated. An anticorrosion treatment method for a compressor provided with a mechanism part,
A seal member that makes the space a sealed space is disposed at a joint portion where the respective members are joined to each other,
An anticorrosion treatment method for a compressor, wherein a height adjusting member having a surface having a sacrificial anticorrosive action with respect to a material of the housing is interposed in the joint portion outside the seal member.   6. The anticorrosion treatment method for a compressor according to claim 5, wherein an elastic seal member is connected to an end portion opposite to the seal member side of the height adjusting member and interposed in the joint portion.   The surface of the joint located outside the seal member, which is in contact with at least the height adjusting member, is covered with a material having a sacrificial anticorrosive action with respect to the material of the housing. The anticorrosion treatment method of the compressor as described in 2.   The surface of the joint located outside the seal member, at least the surface in contact with the elastic seal member, is covered with a film having a sacrificial anticorrosive action on the material of the housing. The anticorrosion processing method of the compressor of description.

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