JP3023571B2 - Scroll compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor for compressing air by a relative motion between a fixed scroll and an orbiting scroll.

[0002]

2. Description of the Related Art Conventionally, this kind of scroll compressor has a structure as shown in FIG. 6, for example. In the figure, 1
Is a casing composed of a main body 1a and a lid 1b covered by the main body 1a. Inside the casing 1, a fixed scroll 2 having spiral teeth 2a, 3a and an orbiting scroll 3 are mutually engaged. Are arranged in mesh with each other.
The fixed scroll 2 is formed integrally with the lid 1b in this case, while the orbiting scroll 3 is mounted on the eccentric shaft 6a of the input shaft 6 rotatably held by the bearings 4 and 5 on the main body 1a. 7 so as to be freely rotatable. The orbiting scroll 3 is also coupled to the casing 1 via an Oldham coupling (not shown), and performs a partial orbiting motion in accordance with the rotation of the input shaft 6. A pulley 8 is provided at one end of the input shaft 6 extending outside the casing 1.
And the rotation of a motor (not shown) is transmitted to the input shaft 6 via the pulley 8. The eccentric shaft portion 6a of the input shaft 6 is integrally provided with a balancer 6b for smoothing the rotation of the input shaft 6.

A suction port 9 is provided at an outer peripheral portion of a lid 1b constituting the casing 1, and a discharge port 10 is provided at a central portion thereof. The teeth 2a and 2a of the scrolls 2 and 3 are respectively provided.
3a is open to the meshing portion. With this configuration, when the input shaft 6 is rotated by the operation of the motor, the air introduced into the casing 1 from the suction port 9 is compressed into a crescent-shaped compression formed between the fixed scroll 2 and the orbiting scroll 3. It is taken into the chamber, and is continuously compressed from the outer peripheral portion to the central portion in accordance with the partial orbital movement of the orbiting scroll 3, and is discharged from the discharge port 10 to the outside.

In the above-mentioned scroll compressor, the compression performance is fixed and orbiting scrolls 2, 3
Greatly depends on the gaps (gaps) between the teeth 2a, 3a and the roots of the teeth, and it is necessary to reduce the gaps as much as possible in order to increase the compression efficiency. However,
Considering the thermal expansion of each tooth 2a, 3a or the processing accuracy thereof, there is a certain limit in reducing this gap. Therefore, conventionally, as shown in FIG. A spiral tip seal 11 'made of, for example, tetrafluoroethylene resin having a low coefficient of friction is embedded at the tip of each tooth 2a, 3a so as to supplement the gap. It should be noted that there is an oil-supply type scroll compressor, in which oil seals the gap, so that such a tip seal is not required.

[0004]

However, according to the scroll compressor in which the tip seal 11 'is buried in the tooth tip, the tip seal 11' has a high temperature and a high pressure. The portion located on the side is exposed to high heat and the amount of thermal expansion increases, so that it is worn out early, and the replacement must be performed frequently.

As a countermeasure against the abrasion, for example, it is conceivable to set the overall characteristics of the tip seal 11 'in accordance with the condition of the center of the scroll. In this case, however, the characteristics do not match on the outer periphery of the scroll. As a result, the sealing property is impaired, and a fundamental solution cannot be achieved. Further, for example, there is also a countermeasure in which the tip seal is divided into a plurality of pieces in the longitudinal direction and the material is changed between the outer peripheral side and the central side, or a countermeasure to change the shape (height) of the tip seal between the outer peripheral side and the inner peripheral side. Although it is conceivable, in the former case, it is unavoidable to generate a gap between the divided elements, and it becomes difficult to obtain a desired compression efficiency. In the latter case, the fixed and orbiting scrolls 2 and 3 are not provided. Since it is necessary to change the size of the groove for burying the chip seal formed on each tooth 2a, 3a,
The processing of the scroll becomes troublesome, and in any case, a new problem occurs.

The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a scroll compressor capable of securing sufficient heat resistance and sealability without dividing or changing the shape of a tip seal. I do.

[0007]

Means for Solving the Problems According to the present invention, in order to achieve the above object, a fixed scroll and an orbiting scroll are meshed and housed in a casing, and the fixed and orbiting scrolls are taken in from their outer peripheral portions by relative motion. In a scroll compressor in which compressed air is sent to the central portion and discharged to the outside from a discharge port provided in a casing, a gap between the tooth bottom of each of the scrolls and the tooth bottom of the other scroll is removed. The mixing ratio of the reinforcing material to the tetrafluoroethylene resin is adjusted such that heat resistance increases and the coefficient of thermal expansion decreases from the outer periphery of both scrolls toward the center.
And molded integrally .

[0008]

In the scroll compressor constructed as described above, the material of the tip seal is changed so that the heat resistance increases and the coefficient of thermal expansion decreases on the center side of the fixed and orbiting scrolls. Not only does the tip seal wear out early, but also the sealability does not change significantly inside and outside the scroll.
And the tip seal is integrally molded
Compressed through the tip seal
No air leaks out.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 and FIG. 2 show a main structure of a scroll compressor according to the present invention. Since the overall structure of the scroll compressor is the same as that shown in FIG. 6, the description of the overall structure is omitted here, and the same reference numerals are given to the same parts B. . In the present embodiment, a tip seal embedded at the tip of the teeth 2a of the fixed scroll 2 and the teeth 3a of the orbiting scroll 3
Reference numeral 11 changes the material of the fixed and orbiting scrolls 2, 3 from the outer periphery toward the center in three stages. The tip seal 11 is four which the glass fiber tetrafluoroethylene resin as a base material, carbon fiber, those obtained by mixing the reinforcing material such as graphite, the fixed and the orbiting scroll 2 and 3 the mixing ratio of the reinforcement By increasing the number on the center side of the scroll, heat resistance is increased and the coefficient of thermal expansion is further reduced on the center side of the scroll.

Here, the tip seal 11 in which the material is changed in three steps on the outer peripheral side and the inner peripheral side as described above can be manufactured, for example, through the steps shown in FIGS. That is, first, as shown in FIG.
And a thin inner cylinder 22 having a smaller diameter than the outer cylinder 21 and a thin intermediate cylinder 23 having an intermediate diameter between the outer cylinder 21 and the inner cylinder 22 are prepared, concentrically combined, and defined by each cylinder. Rooms A, B, C
The ratio of the reinforcing material to the ethylene tetrafluoride resin
Three kinds of mixtures 24a, 24b, 24 changed to 10%, 20%, 30%
c, and then the inner cylinder 22 and the intermediate cylinder 23 are extracted. Next, the outer cylinder 21 containing the three kinds of mixtures 24a, 24b, 24c is set in a press machine.
Press molding at a pressure of about 0 kg / cm ² to obtain a molded body 25 having three layers a, b, and c corresponding to the three kinds of mixtures 24a, 24b, and 24c, as shown in FIG. .

Next, the compact 25 is set on a lathe, and while rotating, a cutting tool is turned from the outer peripheral surface toward the center.
26 is abutted at a predetermined cutting depth to obtain a series of chips 27 having a rectangular cross section. The chips 27 are discharged in a curled shape, and different materials corresponding to the three layers a, b, and c are sequentially arranged from the outer peripheral side to the inner peripheral side. Next, as shown in FIG. 5, the tip 27 is inserted into the groove 28a of a mold 28 having a spiral groove 28a that matches the involute curve of the tip of the fixed and orbiting scrolls 2 and 3. , Heated to 150 to 200 ° C. and pressed by a mating mold (not shown), thereby providing a tip seal 11 having a desired cross-sectional shape and involute curve and changing the material in three stages on the outer peripheral side and the inner peripheral side. Can be obtained.

In the scroll compressor configured as described above, the air taken into the compression chamber formed between the fixed scroll 2 and the orbiting scroll 3 from the suction port 9 causes the orbiting scroll 3 to partially rotate. Accordingly, the air is continuously compressed from the outer periphery to the center and changes to high-temperature, high-pressure air.
a, the heat resistance of the tip seal 11 for sealing the gap between the teeth 3a and the roots thereof is improved toward the center of the fixed and orbiting scrolls 2, 3 by changing the mixing ratio of the reinforcing material . Therefore, it can withstand the high heat generated at the center of the scroll sufficiently and does not wear out early. Moreover, since the thermal expansion coefficient becomes smaller toward the center of the fixed and orbiting scroll 2 and 3, the thermal expansion amount of the tip seal 11 becomes Isuzu constant ho at inner and outer scroll thereon, the tip seal 11 is one
The body is molded and has no seams.
The compressed air does not leak through the
The sealing performance as a body is also improved.

In the above embodiment, the tip seal 11
The material is changed in three stages from the outer peripheral portion to the inner peripheral portion, but the material change may be changed in two or four or more stages.

[0015]

As described above in detail, according to the scroll compressor according to the present invention, the heat resistance increases and the coefficient of thermal expansion decreases at the center of the fixed and orbiting scrolls. So that the reinforcement of the tetrafluoroethylene resin
Using a tip seal integrally molded by changing the mixing ratio
So that sufficient heat resistance and sealing properties can be secured,
This has the effect of remarkably improving the durability reliability as well as the compression efficiency .

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a main structure of a scroll compressor according to the present invention.

FIG. 2 is a plan view showing a main structure of the scroll compressor.

FIG. 3 is a perspective view showing an initial process of manufacturing a tip seal used in the scroll compressor.

FIG. 4 is a perspective view showing an intermediate process of manufacturing a tip seal used in the scroll compressor.

FIG. 5 is a perspective view showing a final step of manufacturing a tip seal used in the scroll compressor.

FIG. 6 is a sectional view showing the overall structure of the scroll compressor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Casing 2 Fixed scroll 2a Fixed scroll tooth 3 Orbiting scroll 3a Orbiting scroll tooth 6 Input shaft 9 Suction port 10 Discharge port 11 Tip seal

Claims (1)

(57) [Claims] 1. A fixed scroll and an orbiting scroll are meshed and housed in a casing, and the air taken in from their outer peripheral portions is compressed and sent to a central portion by the relative movement of the fixed and orbiting scrolls, and is provided in the casing. A scroll tip seal that is embedded in each tooth tip of the fixed and orbiting scrolls and seals a gap with a mating tooth bottom in the scroll compressor. Reinforcement to ethylene tetrafluoride resin so that heat resistance increases and the coefficient of thermal expansion decreases from the outer periphery toward the center
A scroll compressor characterized by being integrally formed by changing the mixing ratio of materials .