JP2009287630A - Fastening part structure in system using medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily and sufficiently secure sealability of a system, in fastening part structure using a bolt in a system using a medium. <P>SOLUTION: In bolt fastening part structure, a washer is interposed between the bolt and a fastened member, and plastically deformable interposing object is formed on a washer surface. Since a minute gap of a fastening part is sealed by plastic deformation of the interposing object in fastening the bolt, the sealability of a medium system is easily secured. The need of a step for sufficiently lowering surface roughness of the bolt, the washer, and the bolt fastening part before the bolt fastening is eliminated, so that processing steps are simplified. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a fastening part structure using a bolt in a system using a medium, and more particularly to a fastening part structure suitable for use in at least a part of a vehicle air conditioner.

  In a vehicle air conditioner, ensuring the airtightness of the medium system is an important issue. By maintaining the hermeticity of the system, it is possible not only to suppress the deterioration of the apparatus performance due to the loss of the medium, but also to prevent the adverse effects on the environmental load and global warming due to the leakage of the medium to the outside. In particular, in an air conditioner, since a medium is often used in a high pressure state, it is required to maintain high hermeticity even at a high pressure.

  In an air conditioner, since a large number of bolts are usually used not only for the equipment itself but also for piping and equipment connections, it is important to ensure the tightness of the bolt fastening portion. In the bolt fastening portion in the prior art, a method of ensuring the hermeticity of the system by using a washer is generally used. However, since both the bolt and the washer are rigid bodies, there are more or less minute gaps between the fastening surfaces depending on the surface roughness of the fastening surfaces, so that the system can be completely and sufficiently sealed. Difficult to wipe out the dangers. For this reason, conventionally, it is necessary to process the surfaces of bolts, washers, and bolt fastening portions in advance before fastening the bolts to sufficiently reduce the surface roughness of each component, which increases the processing man-hours and component costs. Was increasing.

To solve such a problem, a solution is conceivable in which a material suitable for sealing the medium system is used for a part or a part of the part to ensure the sealing of the system. For example, Patent Document 1 discloses a method for suppressing the generation of vibration and noise by using a plastically deformable material for a bolt or an interposed member in a piston reciprocating compressor. However, if the bolt or the intervening member itself is made of a plastically deformable material, the entire part is likely to be deformed, and the shape of the part will be lost from the target form, and the device will achieve the desired performance. There is a risk of not being able to fully demonstrate. Further, when the device is disassembled for repair or the like, there is a concern that the plastically deformed part does not return to its original shape and cannot be reused.
JP-A-8-261155

  Accordingly, an object of the present invention is to make it possible to easily and sufficiently ensure the sealing performance of a fastening portion structure using a bolt in a system using a medium.

  In order to solve the above problems, a bolt fastening part structure according to the present invention is a fastening part structure using a bolt in any part of a system that uses a medium, between the bolt and a member to be fastened. In addition, a washer is interposed, and a plastically deformable inclusion is formed on the washer surface.

  In such a bolt fastening portion structure, since an inclusion capable of plastic deformation is provided between the seat surface portion of the bolt and the washer or between the member to be fastened and the seat surface portion of the washer, the seat provided with the inclusion is provided. Between the surface portions, the inclusions are plastically deformed, so that the space between the seating surface portions is filled in and the generation of minute gaps is prevented, and higher sealing performance can be achieved compared with the conventional structure using only the washer. . In addition, the plastically deformable inclusion layer is a general-purpose part and can be easily replaced only on the surface of the washer. Therefore, the present invention can be implemented very easily.

  Further, in the present invention, since the plastically deformable part is only inclusions formed on the washer surface, the entire part such as the washer is not deformed, and there is a concern about performance deterioration due to shape change. There is no need to do. Further, when disassembling and reassembling the apparatus, only the washer with the inclusion formed on the surface is replaced with a new one, or the same washer is reused and the inclusion layer is provided again for plastic deformation. As a result, it is possible to reproduce the structure and hermeticity before disassembling, and to suppress an increase in parts cost during disassembling and assembling.

  In addition, in the present invention, the process of simplifying the processing process is eliminated because the surface of the bolt, washer, and bolt fastening portion is not processed in advance and the surface roughness of each component is sufficiently reduced before the bolt is fastened. Is possible.

  In the present invention, the composition of inclusions is not particularly limited, but is preferably made of a metal-based material. In particular, it is more preferably made of at least one material of Cu—Sn—Ag, Cu—Sn—In, In—Sn, Cu—Sn, Sn—Ag, and Au. These metal-based materials have high plastic deformability and are easy to process. By using these materials as inclusions, it is possible to reduce the processing cost when the inclusions are provided. In addition, since these metal-based materials are relatively soft, it is possible to easily fill a minute gap that is to be generated between the fastening surfaces by using the fastening force.

  Further, the composition of the washer in the present invention is not particularly limited, but is preferably made of a metal material or an organic material. In any case, the layer of the metallic material capable of plastic deformation as described above can be easily formed.

  The arrangement of inclusions in the present invention is not particularly limited as long as it is a washer surface. For example, an inclusion may be formed in advance on the bolt side seat surface portion of the washer so that it is interposed between the seat surface portion of the bolt and the washer at the time of bolt fastening, or the seat surface portion of the bolt and the fastened member at the time of bolt fastening. Inclusions may be formed in advance on the to-be-fastened member side seating surface portion of the washer so as to be interposed therebetween. In addition, when the above inclusion is disposed at least between the bolt and washer seat surface and between the member to be fastened and the seat surface of the washer at the time of bolt fastening, the inclusion is the bolt side seat surface portion and the member to be fastened seat surface portion of the washer. Or may be formed in advance on the entire surface of the washer (for example, on the entire surface by dipping or the like).

  The scope of application of the bolt fastening portion structure in the present invention is not particularly limited, but in the fastening portion of at least a part of either the compressor in the vapor compression cycle, the connecting pipe to the compressor, or the connecting device. It is preferable to apply. Or it is preferable to apply to the fastening part which at least one part of either the expander in a Rankine cycle, connection piping to it, or a connection apparatus has. And it is preferable to use the volt | bolt fastening part structure in this invention for the at least partial position of a vehicle air conditioner. By using the bolt fastening portion structure of the present invention in a vehicle air conditioner, the airtightness of the medium system can be maintained. Particularly in an air conditioner using a flammable medium or a medium with a large environmental load, the medium is exposed to the outside. It is possible to prevent the environmental impact, the adverse effect on global warming, and the occurrence of problems from leaking.

  As described above, according to the bolt fastening portion structure according to the present invention, the gap between the bolt and the member to be fastened can be comprehensively filled with the plastically deformable inclusion provided on the surface of the washer, and only the washer is used. Compared to the conventional method, high sealing performance can be easily achieved. Moreover, the washer having the inclusions according to the present invention formed on the surface has high reusability, and can suppress an increase in the cost of parts at the time of disassembly and assembly. Furthermore, in the present invention, the processing steps required for reducing the surface roughness of each component in the conventional fastening portion can be eliminated, so that the processing steps can be simplified.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a schematic configuration of a bolt fastening portion according to an embodiment of the present invention. In particular, inclusions that can be plastically deformed are formed in advance on a bolt side seat surface portion and a fastened member side seat surface portion of a washer. In this case, a schematic configuration is shown. In FIG. 1, 1 is a bolt, 2 is a member to be fastened, 3 is a washer, and can be plastically deformed on both the bolt 1 side seating surface portion and the member to be fastened 2 side seating surface portion on the surface of the washer 3. Inclusions 4 are formed. As described above, the material of the inclusion 4 may be appropriately selected from metal materials such as Cu—Sn—Ag, Cu—Sn—In, In—Sn, Cu—Sn, Sn—Ag, and Au.

  FIG. 2 shows an example of a conventional general bolt fastening portion for comparison. Compared to FIG. 1, FIG. 2 is different in that the inclusion 4 that is plastically deformable is not formed. Other configurations are the same as those of the embodiment in FIG. 1, and therefore, the same reference numerals as those in FIG.

  In the conventional bolt fastening portion shown in FIG. 2, the gaps between the bolt 1 and the washer 3 and between the fastened member 2 and the washer 3 are closed by physical contact between the respective surfaces. That is, only when the surface roughness of all the components of the bolt 1, the washer 3, and the fastened member 2 is sufficiently low, the tightness of the system is kept high by physical adhesion between the components. If the surface roughness of any one component of the bolt 1, washer 3, and fastened member 2 is relatively large, a minute gap due to the surface roughness is formed between the fastening surfaces, and the medium leaks through the minute gap. It is impossible to eliminate the risk of occurrence. Therefore, in the bolt fastening portion shown in FIG. 2, it is necessary to sufficiently reduce the surface roughness in advance in all parts of the bolt 1, the washer 3, and the member 2 to be fastened in order to ensure the sealing performance of the system. There is an increase in processing man-hours and costs.

  On the other hand, in the bolt fastening part according to the present invention, as shown in FIG. 1, the sealing between the bolt 1 and the washer 3 and between the fastened member 2 and the washer 3 is ensured by the inclusions 4. Since the inclusion 4 can be plastically deformed, the gap between the bolt 1 and the washer 3 and the gap between the fastened member 2 and the washer 3 are both filled and sealed by the plastic deformation of the inclusion 4 when the bolt is fastened. , No medium leakage occurs. Therefore, in the structure of the bolt fastening portion according to the present invention, it is possible to easily ensure the sealing performance of the medium system, and to prevent adverse effects on the environmental load and global warming due to leakage of the medium to the outside, occurrence of defects, etc. It can be prevented in advance. In addition, in the present invention, the process of simplifying the processing steps is not required because it is not necessary to process the surfaces of the bolts, washers, and bolt fastening portions in advance and sufficiently reduce the surface roughness of each component before fastening the bolts. It is possible.

  The present invention can be used in a system that uses all kinds of media, and is particularly suitable for a bolt fastening portion that requires high refrigerant leakage prevention in a vehicle air conditioner.

It is a schematic block diagram of the bolt fastening part which concerns on one embodiment of this invention. It is a schematic block diagram which shows an example of the conventional bolt fastening part.

Explanation of symbols

1 bolt 2 member to be fastened 3 washer 4 inclusion capable of plastic deformation

Claims (12)

  In a fastening part structure using a bolt in any part of a system using a medium, a washer is interposed between the bolt and a member to be fastened, and an inclusion capable of plastic deformation is formed on the washer surface. The fastening part structure characterized by having done.   The fastening part structure according to claim 1, wherein the inclusion is made of a metal-based material.   The fastening part structure according to claim 2, wherein the metal material is made of at least one material selected from Cu-Sn-Ag, Cu-Sn-In, In-Sn, Cu-Sn, Sn-Ag, and Au. .   The fastening part structure according to any one of claims 1 to 3, wherein the inclusion is formed in advance on a bolt-side seating surface portion of the washer and is interposed between the bolt and the seating surface portion of the washer when the bolt is fastened.   The fastening according to any one of claims 1 to 3, wherein the inclusion is formed in advance on a fastened member side seating surface portion of the washer and is interposed between the fastened member and the seating surface portion of the washer at the time of bolt fastening. Part structure.   The inclusions are formed in advance on the bolt side seat surface portion and the fastening member side seat surface portion of the washer, and are interposed between the bolt and the washer seat surface portion and between the fastening member and the washer seat surface portion when the bolt is fastened. The fastening part structure according to claim 1.   The said inclusion is formed in advance on the entire surface of the washer, and is interposed at least between the seat surface portion of the bolt and the washer and between the member to be fastened and the seat surface portion of the washer when the bolt is fastened. The fastening part structure of crab.   The fastening part structure according to claim 1, wherein the washer is made of a metal material.   The fastening part structure according to claim 1, wherein the washer is made of an organic material.   A system using the medium is composed of a vapor compression cycle, and at least a part of the compressor in the vapor compression cycle, a connection pipe to the compressor, or a connection device has the inclusion in the fastening portion. The fastening part structure according to any one of claims 1 to 9, wherein:   The system using the medium is composed of a Rankine cycle, and the inclusion is provided in a fastening portion of at least one part of an expander in the Rankine cycle, a connection pipe to the expander, or a connection device. The fastening part structure according to any one of claims 1 to 9. The fastening part structure according to any one of claims 1 to 11, which is used in at least a part of a vehicle air conditioner.

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