JP2010007551A - Scroll fluid machine and its method for manufacturing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a scroll fluid machine capable of easily and surely preventing a pin from being corroded by an electrolyte by effectively preventing the electrolyte from intruding into a masking member during anodic oxide coating processing, and also to provide its method for manufacturing. <P>SOLUTION: In this scroll fluid machine 1, the pin 46 stopping the rotation of a movable scroll projects from the rear surface 22b of the movable scroll without obstructing the revolving motion of the movable scroll 22 relative to a fixed scroll 24. The movable scroll is subject to the anodic oxide coating processing after the pin is masked by the masking member 50 one end of which is open. An annular recess 52 for fitting the opening edge 50a of the masking member to the periphery of the pin is formed at the rear surface of the movable scroll. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a scroll type fluid machine and a method for manufacturing the same, and more particularly to a scroll type fluid machine suitable for being incorporated in a refrigeration air conditioner or a heat pump type water heater and a method for manufacturing the same.

This type of scroll type fluid machine, for example, a hermetic scroll compressor, includes a rotation prevention mechanism that prevents rotation of the movable scroll without interfering with the orbiting rotation of the movable scroll with respect to the fixed scroll, and includes a pin constituting the rotation prevention mechanism. The movable scroll is protruded from the back surface of the movable scroll, and after the pin is masked by the masking member, the movable scroll is anodized.
And in order to perform such masking reliably and easily, the technique which forms a masking member from an insertion part, a fixing | fixed part, and a handle is known (for example, refer patent document 1).
JP 2000-110746 A

However, masking members are generally consumables that are reused in the masking process of individual movable scrolls and are discarded after deterioration, and forming such consumables in a complicated manner is the manufacturing of the entire compressor. This is not preferable from the viewpoint of cost reduction.
The present invention has been made in view of such a problem, and can effectively prevent the electrolyte from penetrating into the masking member during the alumite treatment, facilitating and reliably corroding the pin by the electrolyte. It is an object of the present invention to provide a scroll type fluid machine and a method for manufacturing the same.

  In order to achieve the above object, a scroll type fluid machine according to claim 1 is provided with a pin protruding from the back of the movable scroll so as to prevent the movable scroll from rotating without disturbing the orbiting revolution of the movable scroll relative to the fixed scroll. A scroll type fluid machine in which a movable scroll is anodized after masking a pin with a masking member having one end opened, and the opening edge of the masking member is fitted around the pin on the back of the movable scroll. It is characterized by having an annular recess.

The invention according to claim 2 is characterized in that, in claim 1, the annular recess is formed at a position where the masking member can be in close contact with the outer peripheral surface of the pin.
Further, the invention described in claim 3 is characterized in that, in claim 2, the annular recess is formed by spotting a pin insertion hole formed on the back surface of the movable scroll.
Furthermore, the method of manufacturing the scroll type fluid machine according to claim 4 is a method of manufacturing the scroll type fluid machine having a pin that prevents the movable scroll from rotating without disturbing the revolution orbiting motion of the movable scroll with respect to the fixed scroll. An annular recess forming step for forming an annular recess on the back surface of the movable scroll, a pin projecting step for projecting a pin on the inner peripheral surface side of the annular recess formed in the annular recess forming step, A pin masking step for fitting the opening edge of the masking member having one end opened to the annular recess around the pin protruding in the setting step, and an alumite treatment of the movable scroll with the pin masked in the masking step It is characterized by comprising an alumite treatment process.

  According to the scroll type fluid machine of the first aspect of the present invention, the back surface of the movable scroll has the annular recess for fitting the opening edge of the masking member around the pin, thereby masking the back surface of the movable scroll. Since the contact area of the member can be increased, the penetration of the electrolyte into the masking member at the time of anodizing can be effectively prevented, and the corrosion of the pin by the electrolyte can be reliably prevented.

In addition, since the masking member can be easily detached without using an adhesive or the like, the pin masking process can be simplified.
According to the second aspect of the present invention, since the annular recess is formed at a position where the masking member can be in close contact with the outer peripheral surface of the pin, the space in the masking member can be reduced. Infiltration of the electrolyte into the masking member at the time can be further effectively prevented, and corrosion of the pin by the electrolyte can be further reliably prevented.

  Furthermore, according to the invention described in claim 3, the masking member is brought into close contact with the pin to the insertion range by masking the pin insertion hole formed in the back surface of the movable scroll. Since the space in the member can be eliminated as much as possible, it is possible to more effectively prevent the electrolyte from penetrating into the masking member during anodizing, and the corrosion of the pin by the electrolyte can be prevented more reliably. can do.

  Furthermore, according to the method for manufacturing a scroll type fluid machine of the present invention as set forth in claim 4, the manufacturing method includes an annular recess forming step for forming an annular recess on the back surface of the movable scroll, and an annular recess forming step. A pin projecting step of projecting a pin on the back surface on the inner peripheral surface side of the annular recess, and an opening edge of the masking member having one end opened around the pin projecting in the pin projecting step A masking process for a pin to be fitted into the mask, and an alumite treatment process for anodizing a movable scroll whose pins are masked in the masking process. By forming the annular recess before the projecting of the pin in this way, it is possible to facilitate the formation of the annular recess, so that each step of pin masking and eventually the anodizing treatment of the movable scroll can be performed smoothly. The manufacturing process of the movable scroll and thus the scroll fluid machine can be further simplified.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a longitudinal sectional view of a hermetic scroll compressor as an example of a scroll type fluid machine according to the present embodiment. The compressor 1 is incorporated in a refrigeration circuit such as a refrigeration air conditioner or a heat pump type hot water heater. It is. The circuit includes a path through which a carbon dioxide refrigerant (hereinafter referred to as a refrigerant), which is an example of a working fluid, circulates. The compressor 1 sucks the refrigerant from the path, compresses the refrigerant, and discharges the refrigerant toward the path.

  The compressor 1 includes a shell 2. A center shell 4 that forms a cylindrical body of the shell 2 is hermetically fitted with a top shell 6 and a bottom shell 8 on the upper and lower sides thereof, and the inside of the center shell 4 is hermetically sealed. The discharge pressure of the refrigerant is acting. The center shell 4 is connected to a suction pipe 10 for sucking the refrigerant taken in from the circuit, and a discharge pipe 12 for sending the compressed refrigerant in the shell 2 to the circuit is connected to an appropriate position of the top shell 6. .

In the center shell 4, a scroll unit 14, an electric motor 16, and a pump unit 18 are accommodated in order from the top shell 6 side. A rotating shaft 20 is disposed in the electric motor 16, and the rotating shaft 20 is connected to the electric motor 16. It is rotationally driven by energization of.
The rotary shaft 20 has an upper end connected to the scroll unit 14 and a lower end connected to the pump unit 18, and the rotary shaft 20 is driven to rotate by the electric motor 16, whereby the scroll unit 14 sucks and compresses the refrigerant. And a series of discharge processes.

  Specifically, the scroll unit 14 includes a movable scroll 22 and a fixed scroll 24, and the movable scroll 22 includes an end plate 26. A spiral wrap extending toward the end plate 28 of the fixed scroll 24 is provided on the end plate surface 26 a of the end plate 26. On the other hand, a spiral wrap 32 extending toward the end plate 26 is also set up on the end plate surface 28 a of the end plate 28 of the fixed scroll 24.

The wraps 30 and 32 are arranged in pairs and cooperate with each other, so that the refrigerant is sucked from the refrigerant suction chamber formed in the end plate 28 through the suction pipe 10 and is interposed between the wraps 30 and 32. A compression chamber is formed, and the compression chamber moves toward the center of the end plates 26 and 28 while reducing its volume.
In order to give the orbiting scroll 22 a revolving orbiting motion, a boss 34 is formed on the back surface 26b side of the end plate 26, and the boss 34 is rotatable about an eccentric shaft 36 integrally formed on the upper end side of the rotary shaft 20 via a bearing. It is supported by.

On the other hand, the fixed scroll 24 is supported and fixed to a main frame 38 fixed to the inside of the center shell 4, and a discharge hole 40 communicating with the compression chamber is formed in the central portion of the fixed scroll 24. .
On the other hand, the pump unit 18 sucks the lubricating oil stored inside the bottom shell 8, and the sucked lubricating oil passes through an oil passage 42 formed in the rotating shaft 20 from the upper end of the rotating shaft 20 to the electric motor. 16 and the scroll unit 14 and the like, and contributes to the lubrication of each sliding part and bearing, and the sealing and lubrication of the sliding surface.

  According to the compressor 1 described above, the movable scroll 22 revolves without rotating on the pedestal surface 38 a of the main frame 38 as the rotary shaft 20 rotates, so that the scroll unit 14 is connected via the suction pipe 10. The refrigerant sucked into the compression chamber forms a compression chamber. The refrigerant in the compression chamber is compressed while being moved toward the center of the scroll unit 14, and then discharged into the shell 2 through the discharge hole 40 and circulated in the shell 2. It is sent out of the compressor 1 through the discharge pipe 12.

  By the way, the rotation of the movable scroll 22 is blocked by the rotation blocking mechanism 44. The rotation prevention mechanism 44 includes a pin 46 protruding from the back surface 22 b of the movable scroll 22 and a hole 48 recessed in the base surface 38 a of the main frame 38, and the pin 46 is loosely fitted into the hole 48. As a result, the rotation of the movable scroll 22 is prevented without disturbing the orbital revolving motion.

  The pin 46 is made of an iron-based material, while the movable scroll 22 is made of an aluminum alloy. The surface of the movable scroll 22 is improved in wear resistance and corrosion resistance by anodizing. The alumite treatment is a surface treatment in which an oxide film is formed on the surface of the aluminum alloy by immersing the movable scroll 22 in an acidic electrolyte and subjecting it to an anodic oxidation treatment.

Here, the manufacturing process of the movable scroll 22 incorporates a masking process of the pin 46 for preventing the corrosion of the pin 46 by the acidic electrolyte before the anodizing process.
FIG. 2 is a perspective view of a cap (masking member) 50 attached to the pin 46 in the masking process. The cap 50 is formed in a bottomed cylindrical shape made of rubber or resin, and is generally a consumable that is reused in the masking process of each movable scroll 22 and discarded after deterioration.

  As shown in the enlarged cross-sectional view of the main part of the movable scroll 22 in FIG. 3, the cap 50 is fitted in an annular groove (annular recess) 52 formed around the pin 46 on the back surface 22 b of the movable scroll 22. Worn. The groove height and groove width of the annular groove 52 are such that the opening edge of the cap 50, that is, the end surface 50a of the cap 50 and the inner and outer peripheral surfaces 50b and 50c are in close contact with the bottom surface 52a of the annular groove 52 and the inner and outer peripheral surfaces 52b and 52c, respectively. The cap 50 is formed in a size that can be easily attached and detached.

Further, the cap 50 has an elastic force that can be extended to some extent, and the inner diameter of the annular groove 52 is set to be slightly larger than the outer diameter of the pin 46. In other words, the annular groove 52 is an annular groove of the cap 50. At least a part of the inner peripheral surface 50 b of the cap 50 is formed at a position where it can be in close contact with the outer peripheral surface 46 a of the pin 46.
Hereinafter, the manufacturing process of the movable scroll 22 formed in this way will be described in detail.

First, in the annular groove forming step (annular recess forming step), the annular groove 52 is formed on the back surface 22 b of the movable scroll 22.
Next, in the pin projecting step, the pin 46 is projected from the back surface 22b on the inner peripheral surface 52b side of the annular groove 52 formed in the annular groove forming step.
Next, in the masking process of the pin 46, the end surface 50a of the cap 50 is fitted into the annular groove 52 around the pin 46 protruding in the pin protruding process.

Next, in the anodizing process, the movable scroll 22 with the pin 46 masked in the masking process is anodized.
As described above, in the present embodiment, the contact area of the cap 50 with respect to the back surface 22b is increased by providing the back surface 22b of the movable scroll 22 with the annular groove 52 for fitting the cap 50 around the pin 46. Therefore, infiltration of the electrolytic solution into the cap 50 during the anodizing treatment can be effectively prevented, and corrosion of the pin 46 by the electrolytic solution can be reliably prevented.

Moreover, since the cap 50 can be easily detached without using an adhesive or the like, the masking process of the pin 46 can be simplified.
Further, since the annular groove 52 is formed at a position where the cap 50 can be in close contact with the pin 46, particularly the outer peripheral surface 46a of the pin 46, the space in the cap 50 can be reduced. Infiltration of the electrolyte into the inside can be prevented more effectively, and corrosion of the pin 46 by the electrolyte can be prevented more reliably.

Further, in the manufacturing process of the movable scroll 22 as described above, the annular groove 52 can be easily formed by forming the annular groove 52 before the pin 46 protrudes. As a result, each process of anodizing the movable scroll 22 can be performed smoothly, and the manufacturing process of the movable scroll 22 and thus the compressor 1 can be further simplified.
The description of one embodiment of the present invention is finished above, but the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

  For example, in the above embodiment, the annular groove 52 is formed on the back surface 22b of the movable scroll 22. However, the present invention is not limited to this. For example, as shown in FIG. 4, the insertion hole 54 of the pin 46 formed on the back surface 22b. The cap 50 may be fitted into the spotted portion (annular recess) 56 that has been spotted. In this case, since the inner peripheral surface 50b of the cap 50 is brought into close contact with the outer peripheral surface 46a of the pin 46 up to the insertion range of the pin 46 with respect to the insertion hole 54, the space in the cap 50 can be eliminated as much as possible. It is possible to more effectively prevent the electrolyte solution from penetrating into the cap 50 and to prevent the pin 46 from being corroded by the electrolyte solution.

  Moreover, although the said embodiment and modification have demonstrated the hermetic scroll compressor using the carbon dioxide refrigerant incorporated in refrigeration circuits, such as a refrigerating air conditioner and a heat pump type water heater, and its manufacturing method, the present invention is The present invention is not limited to this, and can be applied to a scroll type fluid machine such as a compressor or an expander in various fields using various working fluids and a manufacturing method thereof.

1 is a longitudinal sectional view showing a hermetic scroll compressor according to an embodiment of the present invention. It is a perspective view of the cap with which a pin is mounted | worn at the masking process of the movable scroll of FIG. It is the figure which showed the state in which the cap was mounted | worn with the pin in the masking process of the movable scroll of FIG. It is the figure which showed the state by which the cap which concerns on the modification of this invention was mounted | worn with the pin in the masking process of the movable scroll of FIG.

Explanation of symbols

1 Hermetic scroll compressor (scroll type fluid machine)
22 movable scroll 22b back surface 24 fixed scroll 46 pin 46a outer peripheral surface 50 cap (masking member)
50a End face (opening edge)
52 Annular groove (annular recess)
54 Insertion hole 56 Counterbore (annular recess)

Claims (4)

A pin that prevents the movable scroll from rotating without interfering with the revolving orbiting movement of the movable scroll with respect to the fixed scroll is projected on the back surface of the movable scroll, and the pin is masked by a masking member having an open end, and then the movable scroll is anodized. A scroll type fluid machine obtained by processing,
A scroll type fluid machine having an annular recess for fitting an opening edge of the masking member around the pin on a back surface of the movable scroll.   The scroll type fluid machine according to claim 1, wherein the annular recess is formed at a position where the masking member can be in close contact with an outer peripheral surface of the pin.   The scroll-type fluid machine according to claim 2, wherein the annular recess is formed by spotting a pin insertion hole formed on a back surface of the movable scroll. A method of manufacturing a scroll type fluid machine having a pin that prevents the rotation of the movable scroll without interfering with the revolving orbiting motion of the movable scroll with respect to the fixed scroll,
An annular recess forming step for forming an annular recess on the back of the movable scroll;
A pin projecting step of projecting the pin on the back surface on the inner peripheral surface side of the annular recess formed in the annular recess forming step;
Around the pin protruding in the pin protruding step, the pin masking step of fitting the opening edge of the masking member having one end opened into the annular recess;
A method of manufacturing a scroll type fluid machine comprising: an alumite treatment step of anodizing the movable scroll whose pins are masked in the masking step.

Images