JP2001342979A - Scroll compressor and method for manufacturing scroll member of the compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scroll compressor capable of increasing performance by preventing a leakage from a clearance part between scroll members and a method for manufacturing the scroll members thereof. SOLUTION: This scroll compressor comprises a fixed scroll member 120 and a movable scroll member 140, and compresses the fluid sucked into an operating chamber VC formed of both scroll members 120 and 140. The clearance part 160 of the operating chamber VC is formed on the surface of at least either of both scroll members 120 and 140, and filled with a surface treatment material 170 harder than the other scroll members 120 and 140. Also, the surface of at least either of both scroll members 120 and 140 is covered with the surface treatment material 170 by a thickness equal to or more than the maximum distance of the clearance part 160, and both scroll members 120 and 140 are operated to wear by sliding the surface treatment material 170 to a specified film thickness.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor suitable for use in, for example, a vehicle refrigeration cycle and a method of manufacturing a scroll member thereof.

[0002]

2. Description of the Related Art In a scroll member of a scroll compressor, in order to efficiently compress a fluid without leaking,
Very high dimensional accuracy is required. Japanese Unexamined Patent Publication No. Hei 9-88851 discloses a conventional technique for easily ensuring the dimensional accuracy of the scroll member. That is, as shown in FIG. 4, a pair of scroll members 120, 140
A fluorine-based resin film 174 is formed on at least one surface of the
0 and 140 are slid, and the fluororesin film 174 is slid and worn to a predetermined thickness.

As a result, the scroll members 120, 14
The precise dimensional accuracy of 0 can be easily adjusted by the thickness of the fluorine film 174 without requiring a complicated mechanical grinding process, thereby improving the manufacturing efficiency and the manufacturing cost.

[0004]

However, for example, in the machining of the scroll members 120 and 140, there is a gap in the gap between the combined scroll members 120 and 140 due to the escape of the machining and the restriction on the shape of the cutting tool. It is not possible to eliminate the gaps, especially at the corners thereof. In this regard, the invention described in the above-mentioned publication is a technology relating to easy adjustment of the dimensional accuracy of the main surfaces of the scroll members 120 and 140, and there is no technical idea to fill the gap as described above, and the gap is filled. There is no idea that the film thickness of the fluorine-based resin film 174 is set in consideration of the above. Therefore, in the abrasion treatment of the surface treatment film 174, gaps cannot be compensated for, so that fluid leakage therefrom cannot be prevented, and the performance as a compressor decreases. In particular, when operating in a supercritical refrigeration cycle in which the pressure difference between the suction side and the discharge side is very large and the discharge volume is small, such as a refrigeration cycle using a CO2 gas refrigerant, a CFC-based low-pressure refrigerant is used. In the refrigeration cycle, the performance degradation due to fluid leakage from the gap, which was hardly affected, cannot be ignored.

SUMMARY OF THE INVENTION In view of the above problems, it is an object of the present invention to provide a scroll compressor capable of preventing leakage from a gap between scroll members and improving performance even when using a refrigerant at a high pressure, and manufacturing the scroll member. It is to provide a method.

[0006]

The present invention employs the following technical means to achieve the above object.

According to the first aspect of the present invention, the fixed scroll member (120) and the movable scroll member (140) are provided.
A scroll type compressor that compresses and discharges fluid sucked into a working chamber (VC) formed by the two scroll members (120, 140). Is formed on at least one surface of both scroll members (120, 140) and is filled with a surface treatment material (170) having a lower hardness than the other scroll members (120, 140). .

As a result, the gap (160) between the scroll members (120, 140) which cannot be avoided by machining, ie, the gap (160) generated in the working chamber (VC), is treated with the surface treatment material (17).
0), the leakage of the fluid can be prevented, and the performance of the compressor can be improved (compression efficiency can be improved). In particular, when the fluid is used at a high pressure, the performance is more effectively improved because the performance is greatly affected by the gap (160).

According to the second and third aspects of the invention, the scroll members (120, 140) are made of a steel material or a non-ferrous metal material, and the surface treatment material (17,
0) is a resin material (171) or a composite material of resin and metal (172).

Specifically, the resin material (171) is a Teflon resin, and a composite material (17
2) is characterized by being a composite material obtained by adding a nickel-phosphorus alloy to Teflon (registered trademark) resin or a composite material obtained by adding molybdenum disulfide to polyamideimide.

Thus, the gap (16) can be formed easily at low cost.
0) can be filled, and leakage of fluid can be prevented.

In the invention according to claims 4 and 5, the scroll members (120, 140) are made of a steel material or a non-ferrous metal material, and the surface treatment material (17
0) is a plating material (173).

Specifically, the plating material (173) is
It is characterized by being a tin or nickel-phosphorus alloy.

Thus, the plating material (173) is
Since it is metal-bonded to the scroll members (120, 140), the scroll members (120, 140) do not peel off and have excellent durability, and can more effectively prevent leakage from the gap (160).

[0015] According to the invention described in claim 6, in claims 1 to 5,
The scroll-type compressor according to any one of the above, wherein the scroll-type compressor is applied to a supercritical refrigeration cycle.

As a result, in a supercritical refrigeration cycle in which the pressure difference between the suction side and the discharge side is very large and the discharge volume is small, the performance deterioration of the compressor due to leakage of the fluid becomes extremely large, Performance can be improved effectively by preventing leakage.

According to a seventh aspect of the present invention, there is provided the method of manufacturing a scroll member for a scroll type compressor according to the first aspect, wherein at least one of the scroll walls of the scroll members (120, 140) has a surface. The gap (160) formed between the scroll members (120, 140).
, And the scroll members (120, 140) are pressed against each other in a state where the spiral walls are engaged with each other to cause an eccentric orbital motion, whereby the scroll members (120, 140) are eccentrically revolved. ) Is characterized by sliding wear to a predetermined film thickness.

Thus, the scroll member (12)
0, 140) The surface treatment material (170) applied to the surface is
After sliding of the two scroll members (120, 140), the gap portion (160) remains so as to fill the gap portion (160) without sliding abrasion. It can be a manufacturing method.

The reference numerals in parentheses of the above means indicate the correspondence with the specific means described in the embodiment described later.

[0020]

(First Embodiment) FIG. 1 shows a scroll type compressor (hereinafter abbreviated as a compressor) according to the present embodiment.
FIG. 1 is an axial cross-sectional view of FIG. In FIG. 1, 110 is a front housing,
Reference numeral 120 denotes a fixed scroll member fixed to the front housing, and reference numeral 130 denotes a rear housing fixed to the fixed scroll member 120.

As is well known, the fixed scroll member 120 includes a substantially disk-shaped fixed substrate 121 and a fixed substrate 121.
, And has a spiral fixed scroll 122 protruding toward the front housing 110 side.
Fixed scroll member 120 and front housing 110
A movable scroll member 140 that rotates (revolves) with respect to the fixed scroll 120 is provided in a space formed between the movable scroll member 140 and the fixed scroll 120.

The movable scroll member 140 is, like the fixed scroll member 120, also a substantially disk-shaped movable substrate 1.
41, and a scrollable movable scroll 142 protruding from the movable substrate 141 toward the fixed substrate 121. The scroll 122, 142 forms a working chamber VC for sucking and compressing a refrigerant (fluid). Have been.

A discharge port 123 for discharging the compressed refrigerant is formed substantially at the center of the fixed substrate 121, and a discharge chamber 131 is formed on the rear housing 130 side of the discharge port 123. Reference numeral 132 denotes a reed valve-shaped discharge valve for preventing the refrigerant from flowing backward from the discharge chamber 131 to the working chamber VC.
A stopper 134 regulates the maximum opening degree of the refrigerant outlet 2, and a discharge port 134 discharges the refrigerant to the outside of the compressor 100 (condenser side or the like).

Reference numeral 150 denotes a movable scroll member 1 which obtains a driving force from an external driving source (not shown) such as a vehicle driving engine.
40 is a shaft for rotating and driving the shaft 40.
0 is the front housing 1 via the rolling bearing 151
10 rotatably supported. Also, shaft 1
The shaft 15 is located on the movable scroll 140 side of the 50.
Key part (eccentric part) eccentric by a predetermined amount with respect to 0 axis
A bush 153 that slidably contacts the two surface widths 152a of the key portion 152 is fitted into the key portion 152. And the bush 153
Is rotatably connected to a boss 143 of the movable scroll member 140 (movable substrate 141) via a needle bearing 154.

An anti-rotation mechanism (not shown) is provided between the front housing 110 and the movable board 141 so that when the shaft 150 rotates, the movable scroll member 140 revolves without rotating.

Incidentally, the balancer 155 for canceling the centrifugal force (vibration) accompanying the revolution of the orbiting scroll 140 is press-fitted into the bush 153. Hereinafter, the space in which the balancer 155 is provided is referred to as a balancer chamber 156.

A suction passage 125 through which the refrigerant drawn into the working chamber VC is guided is formed on the radially outer side of the fixed scroll member 120, and a balancer chamber 156 is provided between the shaft 150 and the front housing 110. A shaft seal 157 that prevents refrigerant, lubricating oil, and the like leaking out of the compressor from flowing out of the compressor 100 is slidably disposed on the shaft 150.

Due to the overall structure of the compressor 100, the refrigerant flowing into the working chamber VC from the suction passage 125 is sequentially revolved by the movable scroll 140 due to the rotation of the shaft 150 driven by the external drive, so that the refrigerant is sequentially transferred to the center working chamber VC. When it is compressed while moving and reaches a predetermined pressure, the discharge valve 132 is opened, and flows out of the discharge port 134 through the discharge port 123 and the discharge chamber 131.

Next, the detailed structure of both scroll members 120 and 140, which are essential parts of the present invention, will be described.

The scroll members 120 and 140 are made of an aluminum alloy material as a non-ferrous metal material, and the substrates 121 and 141 and the scrolls 122 and 142 are integrally formed by die-casting. The precision of each part is determined by the processing. However, as shown in FIG. 2A, in machining, there are limitations on the escape of machining and the shape of the cutting tool.
A gap 160 is created between the tooth bottom and the tooth tip.
Both scrolls 122 and 14 forming the gap 160
Although the maximum distance A between the two varies depending on the processing tool and the processing method, it is about 5 to 15 μm.

Here, as shown in FIG. 2B, after the above-mentioned machining, the movable scroll 1 of the fixed scroll 120 is moved.
Considering the maximum distance A of the gap 160 on the surface on the 40 side,
The compressor 100 is formed by applying tin plating 173 having a film thickness (preferably 15 to 25 μm, preferably about 20 μm in the present embodiment) of the maximum distance A or more. Then, as an initial operation, a normal rotation speed region (3500 to 5000 rpm)
m). (30 minutes to 1 hour) As a result, since the tin plating 173 is made of a material having a lower hardness than the movable scroll member 120, as shown in FIG.
By the initial operation, the sliding portion between the two scroll members 120 and 140 is worn and remains in the portion not sliding with each other. In addition, there is a portion where the abrasion powder worn by the sliding portion is pushed out to the gap 160 and adheres and is pressed so as to close the gap 160. Therefore, the gap 160 between the scroll members 120 and 140, which cannot be avoided by machining, that is, the gap 160 generated in the working chamber VC is reliably filled with the tin plating 173 remaining without sliding, so that leakage of the refrigerant can be prevented. Compressor performance (compression efficiency) can be improved. In addition, it does not peel off due to metal bonding by plating and is excellent in durability.

The scroll members 120, 140
May be changed to an aluminum alloy material as a non-ferrous metal material, and a steel material (preferably cast iron for forming a scroll) may be used. As a plating material, the same effect as described above can be obtained. It may be a nickel-phosphorus alloy material.

The plating (173) portion may be formed on the surface of the fixed substrate 121 of the fixed scroll member 120 or the fixed scroll 122, as shown in FIG. May be partially applied to the tip of the tooth. As shown in FIG. 3B, the scrolls 122 and 142 may be provided on the respective tooth tips. Further, the surface of the movable scroll member 140 on the fixed scroll member 120 side may be plated.

(Other Embodiments) As another embodiment, instead of the plating material described in the first embodiment,
The resin material may be a low-cost, easily surface-treated resin material, and specific materials include a Teflon material, a composite material of Teflon + nickel-phosphorus, and a composite material of polyamideimide + molybdenum disulfide.

Further, in a supercritical refrigeration cycle in which the pressure difference between the suction side and the discharge side is very large and the discharge volume is small, the performance of the compressor due to leakage of the fluid is greatly reduced. Then, the performance can be effectively improved by preventing the leakage of the fluid.

[Brief description of the drawings]

FIG. 1 is an axial cross-sectional view showing an overall configuration of a scroll compressor of the present invention.

2 (a) is an enlarged view showing a state before surface treatment, FIG. 2 (b) is a state after surface treatment, and FIG. 2 (c) is a state after operation between scroll members.

3A and 3B are enlarged views of a scroll member according to a first modification and a second modification, respectively, showing a portion of another surface treatment.

FIG. 4 is a cross-sectional view showing a conventional scroll member.

[Explanation of symbols]

 Reference Signs List 120 fixed scroll member 121 fixed substrate 122 fixed scroll 140 movable scroll member 141 movable substrate 142 movable scroll 160 gap 170 surface treatment material 173 plating VC working chamber

Continued on the front page (72) Inventor Takeshi Sakai 1-1-1, Showa-cho, Kariya-shi, Aichi, Japan Denso Co., Ltd. (72) Inventor Takashi Kado 1-1-1, Showa-cho, Kariya-shi, Aichi pref. ) Inventor Toshinobu Takasaki 1-1-1, Showa-cho, Kariya-shi, Aichi F-term in DENSO Corporation (Reference) 3H029 AA02 AA16 AB03 BB16 BB31 CC05 CC19 CC38 CC39 3H039 AA02 AA12 BB07 BB15 CC02 CC03 CC05 CC35 CC36

Claims (7)

[Claims] An operating chamber (V) provided with a fixed scroll member (120) and a movable scroll member (140), and formed by the two scroll members (120, 140).
C) In a scroll type compressor that compresses and discharges fluid sucked into the scroll chamber, a gap (160) of the working chamber (VC) is formed on at least one surface of both of the scroll members (120, 140). , The other scroll member (120, 140)
A scroll type compressor which is filled with a surface treatment material (170) having a lower hardness than that of the scroll type compressor. 2. The two scroll members (120, 14).
0) is a steel material or a non-ferrous metal material, and the surface treatment material (170) is a resin material (171) or a composite material of a resin and a metal (172). The scroll-type compressor as described. 3. The resin material (171) is a Teflon resin, and the resin-metal composite material (172) is a composite material obtained by adding a nickel-phosphorus alloy to a Teflon resin or molybdenum disulfide to a polyamideimide. The scroll type compressor according to claim 2, wherein the scroll type compressor is an added composite material. 4. The scroll members (120, 14)
The scroll compressor according to claim 1, wherein 0) is a steel material or a non-ferrous metal material, and the surface treatment material (170) is a plating material (173). 5. The plating material (173) is made of tin or a nickel-phosphorus alloy.
2. The scroll compressor according to item 1. 6. The scroll type compressor according to claim 1, wherein the scroll type compressor is applied to a supercritical refrigeration cycle. 7. The method for manufacturing a scroll member of a scroll compressor according to claim 1, wherein said scroll members (120, 140) are provided on a surface of at least one spiral wall of said scroll members (120, 140). , 140) is coated with the surface treatment material (170) to a thickness not less than the maximum distance of the gap portion (160), and the two scroll members (120, 140) are pressed against each other with the spiral walls meshing with each other. Eccentric orbital motion, and the surface treatment material (17
A method of manufacturing a scroll member of a scroll compressor, wherein the method of (1) is slidably worn to a predetermined thickness.