JP3271365B2 - Scroll compressor and its tip seal - 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 used for an air conditioner, a refrigerator and the like, and more particularly to a tip seal attached to a scroll wrap.

[0002]

2. Description of the Related Art FIG. 5 shows the structure of a general scroll compressor. The compression principle is based on the principle that two members, the fixed scroll 2a and the movable scroll 2b, are combined to form a compression chamber 27a, and the refrigerant gas taken in from the outer periphery is gradually reduced in volume toward the inside to compress. . A tip seal is generally inserted at the top of the scroll wraps 28 and 29 forming the compression chamber for sealing. The tip seal has a generally rectangular cross section and is housed in a seal groove, and can be freely moved up and down. The plan view has a spiral shape similar to the scroll wrap as shown in FIG. In general, the materials used for chip seals are required to have good sealability and wear resistance, and therefore are often special resin materials. Since Teflon-based materials cannot be injection molded, they are stamped. However, because of the large area to be discarded, the cost is high. In view of this, although some injection molding materials are used, the injection molding gate is generally provided at a position indicated by an arrow C in FIG.

[0003]

At such a gate position, unless the gate portion is removed with high precision along the groove shape, the chip seal will not be able to function because it will be caught in the groove.
It does not enter the groove, and costs for removing burrs and the like at the gate portion are required.

Further, since the resin flows separately from the gate portion to the left and right, the flow of the resin is stagnant, and the strength of this portion is weakened, particularly in the case of a resin containing a filler.

[0005] Further, since the shape of the chip seal requires accuracy on the order of microns, it is necessary to design and process a die in consideration of shrinkage and deformation during resin molding.

In addition, since the correction amount is different between the vicinity of the gate and the position away from the gate, complicated correction is required, and it is difficult to obtain a chip seal having an accurate shape.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem.
The purpose is to obtain a high-precision one.

[0008]

In order to solve the above-mentioned problems, the present invention provides a chip sealing material made of a thermoplastic resin material,
The gate position of the injection molding is provided at the beginning or end of winding of the chip seal, and the groove at the end of the gate is elongated.

[0009]

According to the present invention, a thermoplastic resin material is used as a chip seal material, and a gate position for injection molding is provided at an end of the chip seal, so that a uniform resin flow is obtained, thereby eliminating strength defects. .

In addition, since the gate position is located at the end of the mold, which takes into account the shrinkage deformation during molding, it is sufficient to uniformly correct the winding angle, and a high-precision chip seal can be obtained relatively easily.

Further, by making the length of the groove slightly longer than that of the chip seal, even if some burrs or the like remain on the gate portion of the injection molding, they will not be caught. Therefore, the tip seal does not exhibit the sealing property. Further, the cost can be reduced because burrs and the like of the gate portion can be easily removed.

[0012]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 5 is a vertical sectional view of the scroll compressor, and FIG.
Shows a tip seal of one example of the present invention. Arrows A and B indicate the gate positions. FIG. 2 is a view showing an example of the chip seal of the present invention housed in a groove, FIG. 3 is an enlarged view of the vicinity of an end of a gate portion, and FIG. 4 is a longitudinal sectional view showing the chip seal of the present invention housed in a groove.

In FIG. 5, a compression mechanism 2 in which a fixed scroll 2a and a movable scroll 2b orbiting with respect to the fixed scroll 2a are meshed inside a closed container 1.
And a thrust bearing 3 for supporting the orbiting scroll 2b and a bearing component 4 for supporting the thrust bearing 3 are provided at the upper part.
Then, the shaft 2c of the orbiting scroll 2b is inserted into the eccentric bearing 6 of the hole 5b provided at the end 5a of the crankshaft 5, and the orbiting scroll 2b is rotated by the crankshaft 5. A rotor 7 b of an electric motor 7 is attached to the crankshaft 5, and the stator 7 shrink-fitted and fixed to the closed casing 1.
a is arranged at the lower part of the bearing component 4 together with a. The crankshaft 5 is supported by a main bearing 8 of the bearing component 4 and an auxiliary bearing 23 press-fitted and fixed to a bearing support component 25 fixed to the closed casing 1 below the electric motor. An oil sump 10 for storing a lubricating oil 9 is provided at a lower bottom portion of the closed container 1.
A gas suction pipe 11 is provided on the side of the sealed container 1. The gas pressure on the suction side acts on the oil sump 10. The bearing part 4 is provided with an oil discharge port 12 for lubricating the main bearing 8, the eccentric bearing 6, and the thrust bearing 3 and discharging the lubricating oil 9 cooled. Crankshaft 5
Lubricating oil 9 is applied to each bearing part, that is, main bearing 8, eccentric bearing 6,
A through-hole 13 for supplying to the thrust bearing 3 is provided, and an oil guide 14 is press-fitted or shrink-fitted and attached to the lower end of the crankshaft 5 to suck up the lubricating oil 9. Reference numeral 15 denotes a discharge chamber provided between the upper shell 1a, which is a part of the closed vessel 1, and the fixed scroll 2a, and serves as a discharge muffler for temporarily storing gas compressed by the compression mechanism 2. Reference numeral 16 denotes a discharge pipe for outputting a compressed gas to the outside of the closed container 1. A high-pressure gas in the discharge chamber 15 and a low-pressure gas acting on the oil sump 10 are spacers 17.
The fixed scroll 2a and the bearing component 4 are connected via a spacer 17 with bolts.
The entire circumference of the spacer 17 is fixed to the closed container 1 by welding. Reference numeral 18 denotes a notch provided in the stator 7a, and a lubricating oil 9 discharged from the oil discharge port 12
Return to Reference numeral 19 denotes a check valve for preventing the movable scroll 2b from rotating backward when stopped, reference numeral 20 denotes an Oldham ring for preventing rotation of the movable scroll 2b relative to the fixed scroll 2a, and reference numeral 21 denotes a low pressure to the compression mechanism 2. This is a suction port provided in the bearing component 4 for sucking gas. Here, the lower sub-bearing support part 25 serves as a support for the lower sub-bearing 23 and a lid for the oil reservoir 10, and a refrigerant (not shown) dissolved in the lubricating oil 9 in a transient state such as at the time of startup. ) Is effectively suppressed.

The suction gas flowing into the closed container 1 from the suction officer 11 enters the compression space 27 through the suction hole 21. The compression space 27 includes the fixed scroll 2a and the movable scroll 2
“b” is formed by these scrolls, and gradually reduces and compresses the sucked refrigerant gas from the outside to the inside.
The compressed refrigerant is supplied to the tip seal 26 housed in the grooves 30 and 31 provided on the tip surfaces of the wraps 28 and 29.
a, 26b prevents leakage from the high-pressure side compression space 27a to the low-pressure side compression space 27b. And
The compressed refrigerant is discharged out of the closed vessel 1 through the discharge pipe 16 from the discharge hole 32 of the end plate 2d of the fixed scroll 2a.

The tip seals 26a and 26b are
The gas on the high-pressure side in the compression space 27 flows into this groove, floats by that force, and comes into close contact with the other end plates 2d, 2e. As a result, the tip seals 26a and 26b ensure the sealing property between the end plates 2d and 2e facing the wraps 28 and 29.
As described above, the tip seal quickly floats in the groove and acts to seal, so that high shape accuracy is required.

When a chip seal material is prepared by injection molding, a gate for injecting a resin material is required. In the present invention, as shown in FIG. 1, the tip seal is located at the winding start portion B or the winding end portion A. Here, the case where the gate is at B will be described. The molten resin raw material is injected into the product mold from B. The resin material to be selected is required to have a hot water flow property because it flows in an elongated mold in addition to the heat resistance and abrasion resistance which are the original functions. A typical resin material is based on PPS, liquid crystal polymer, PEEK, or the like, and contains various additives for improving abrasion resistance and increasing strength. In particular, when a filler such as SiC or carbon is added, the raw material injected from B flows uniformly toward A , so that the directions of the filler are evenly aligned and the strength is stable. Further solidification of the injected resin from B since different degrees of cooling from B to A, in microns that shrinkage is different. However, the value becomes almost uniform from B to A , and the value of the mold correction for obtaining the accuracy of the product becomes uniform from B to A , so that the correction is easy.

As shown in FIG. 1, the gate residue 26c tends to remain at the gate position of the formed chip seal. Even if there is some residual portion 26c, as shown in FIG.
If the length of the groove of the tip seal is made slightly longer than the end of the tip seal, the remaining portion 26c is accommodated in the groove, and does not hinder the storability of the tip seal and the vertical movement in the groove. Therefore, compared to having a gate on the side, there is no need to cut the gate with strict accuracy,
Chip seals can be made at low cost. Further, the pressure difference exists on both sides of the wall of the extension of the groove in which the gate remaining portion is stored, and the time during which the pressure difference exists is short, so that even if the sealing property is impaired, the performance is hardly affected. This is the same when the gate is placed at the winding start portion B.

[0019]

According to the present invention, as is apparent from the above description,
The tip seal material accommodated in the groove provided on the tip surface of the wrap is made of a thermoplastic material, and an injection molding gate is provided at the winding start end of the tip seal. Uniformity and easy mold correction make it possible to obtain a high-precision product, improve the sealing performance, and improve the strength and reliability of a resin containing a filler, especially. Furthermore, by making the groove corresponding to the gate longer, the function of the chip seal can be fully exhibited without cutting the gate with strict precision, so that a compressor with low cost and high performance reliability can be realized. The effect is exhibited.

[Brief description of the drawings]

FIG. 1 is a plan view of a chip seal showing an example of the present invention.

FIG. 2 is a plan view of a storage diagram of the chip seal of the present invention in a groove.

FIG. 3 is an enlarged plan view of a winding end portion in FIG. 2;

FIG. 4 is a longitudinal sectional view of a storage diagram of the chip seal of the present invention in a groove.

FIG. 5 is a longitudinal sectional view of a scroll compressor.

FIG. 6 is a plan view of a conventional tip seal.

[Explanation of symbols]

 2a Fixed scroll 2b Movable scroll 2c, 2b End plate 26a, b Tip seal 28, 29 Wrap 30, 31 Groove A, B, C Gate position

Continuation of the front page (56) References JP-A-6-137285 (JP, A) JP-A-4-26207 (JP, A) Measurement of molding processability of thermoplastic resin by spiral flow by Shosaburo Yamaguchi et al. , Kogakuin University research report, Japan, Kogakuin University, February 25, 1970, No. 27, pp. 79-92 (58) Fields investigated (Int. Cl. ⁷ , DB name) F04C 18/02 311

Claims (4)

(57) [Claims] A fixed scroll having a head plate and a spiral wrap; a movable scroll having a head plate and a spiral wrap meshing with the fixed scroll facing the fixed scroll; Of the scroll compressor housed in the groove
A tip seal made of a thermoplastic resin material , wherein a gate for injection molding is provided at a winding start end of the tip seal. 2. A method thermoplastic resin as a base, according to claim 1, characterized in that a filler as a reinforcing material
Of the chip seal. 3. The tip seal according to claim 1 or 2 is provided.
Scroll compressor. 4. A tip seal according to claim 1 or 2 is provided.
The scroll compressor according to claim 1, wherein
A scroll compressor, wherein a length of a groove provided on a tip end surface of a wrap corresponding to an end portion of a wrap portion is longer than a length of a tip seal.