JPH1047265A - Scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compressor, by which sealing performance can be maintained for a long time use, the reliability can be heightened, be surely floated to seal even if the chip seal peripheral pressure is small, and lowering of compression efficiency can be prevented, and which is not hard to be manufactured and suitable for mass production. SOLUTION: A chip seal 100 is disposed in a seal groove 4 having a U-shaped cross section, which is formed on the end part of a lap 9A of a revolving scroll 9, and divided into a chip seal upper member 2 and a chip seal lower member 1 along the scroll direction, and pressure chambers 5, 5' where pressure of compressed gas is introduced are provided between the members 1, 2. Rectangular projecting and recessed parts are formed on the lower surface of the chip seal upper member 2 and the upper surface of the chip seal lower member 1. Blow-by preventing projections are formed on the inside surfaces of the chip seal upper and lower members 1, 2. When a scroll compressor starts the operation, the chip seal upper member 2 is floated to come into sliding contact with a panel board, thereby preventing leakage.

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 supplying compressed gas,
In particular, the present invention relates to a scroll compressor having a tip seal for preventing leakage of compressed gas.

[0002]

2. Description of the Related Art Tip seals for scroll compressors are:
During prolonged operation, it wears due to the lapping head that slides in contact, reducing the thickness of the tip seal. Therefore, in order to maintain the reliability of the tip seal even during a long-term compressor operation, the tip seal needs to extend or float in the direction of the facing mirror plate. Known techniques relating to a scroll compressor tip seal designed to solve the above problem include, for example, the following.

[0003] In the tip seal according to this known technique, a fine notch is obliquely formed on the tip seal surface with respect to the surface. The high-pressure gas penetrates into the notch to form the notch, so that the tip seal floats and the sealing performance is improved.

[0004] Japanese Patent Application Laid-Open No. Hei 7-12064 discloses a known technique in which a pressure in a discharge chamber is guided to a groove formed on a wrap end surface of a fixed scroll, and a back pressure is applied to a tip seal fitted in the groove. It stably presses against the facing end plate.

[0005] Japanese Patent Application Laid-Open No. 6-288363 discloses a conventional technique in which a through hole is provided at the bottom of a chip seal groove near a tip seal end on a high-pressure side and in contact with the bottom of the chip seal in a radially inward direction. This is to improve the sealing performance between the head and the head.

[0006] Japanese Unexamined Patent Application Publication No. 6-49782 discloses a known technique in which a groove bottom in which a chip seal is fitted is provided with
This groove is provided with a pore communicating with the high-pressure chamber.

[0007]

However, the above-mentioned known technology has the following problems. In the known art,
Since the notch cut diagonally to the chip seal surface is small, the floating amount (extension amount) in the direction of the lap head plate is small. Therefore, it is difficult to make the tip seal float by compensating for the wear caused by long-term use, and it is difficult to improve the reliability for long-term use. In addition, due to the structure in which pressure is introduced into the oblique cut to float the entire tip seal, it is not possible to apply all of the introduced pressure in the floating direction.For example, a part of the introduced pressure goes downward to open the cut. The pressure is not sufficiently utilized for levitation. Therefore, as a result, the ambient pressure required for floating (elongation) needs to be large to some extent, and it is practically difficult to apply the chip pressure to the outer peripheral portion of the scroll where the atmospheric pressure is not structurally high. In addition, since a large number of diagonally cut notches are required, it is difficult to mass-produce them, which causes an increase in cost.

[0008] In each of the prior arts, the discharge pressure is used as the pressure used for floating the tip seal. That is, a part of the high pressure generated by the compression is wasted because the tip seal floats, so that it is difficult to suppress a decrease in the compression efficiency.

SUMMARY OF THE INVENTION The present invention has been devised to solve the above-mentioned problems of the conventional tip seal, and has an object to maintain the sealing performance even for a long-term use and to improve the reliability. It is an object of the present invention to provide a compressor that can be reliably floated and sealed even when the pressure is high and the peripheral pressure of the tip seal is small, and that is suitable for mass production without difficulty in manufacturing and that can prevent a decrease in compression efficiency. .

[0010]

According to the present invention, there is provided, in accordance with the present invention, an orbiting scroll member and a fixed scroll member having a substantially spiral shape, and a facing plate portion of the fixed scroll of the orbiting scroll member. And a portion of the fixed scroll member facing the end plate portion of the orbiting scroll, a chip seal insertion groove formed along the substantially spiral direction, and mounted on the chip seal insertion groove, A tip seal that prevents gas from leaking from the high pressure side to the low pressure side, and a scroll compressor comprising:
A scroll compressor comprising: a plurality of pressure chambers in which communication with each other is substantially prevented; and a high-pressure side pressure in a spiral direction position in which each of the pressure chambers is provided is introduced into the pressure chamber. Is provided. That is, a plurality of pressure chambers are provided in a substantially spiral direction of the chip seal, for example, between the inside of the chip seal and between the chip seal and the groove, and the high-pressure side pressure at the position in the spiral direction is introduced into the pressure chamber. The force of “high pressure side pressure × area” acts to lift the tip seal upward against the upper wall of the pressure chamber. On the other hand, at this time, at a certain spiral direction position of the pressure chamber, the force of pressure × area on the upper surface of the tip seal is:
It acts to push down the tip seal against the tip seal upper surface. However, the pressure on the upper surface of the tip seal becomes lower than the pressure on the high pressure side due to the pressure gradient caused by the pressure difference between the high pressure side and the low pressure side across the tip seal. Therefore, the force for pushing down the tip seal is smaller than the force for pushing up the tip seal. Therefore, at least the upper part of the tip seal above the pressure chamber, for example, the upper part when the tip seal has a two-part structure. The chip seal when forming irregularities in the member or the groove for inserting the chip seal, or the upper wall of the pressure chamber when penetrating the inside of the chip seal floats to seal. At this time, the structure and the floating method of the pressure chamber include a structure in which the tip seal is divided into two parts, a lower member and an upper member, a pressure chamber is formed between these members, and the upper member is floated, A pressure chamber is formed in a gap portion where the upper and lower surfaces of the groove for inserting the chip seal are formed to substantially fit each other, so that the entire chip seal is floated, and a pressure communicating in both wall directions of the groove for inserting the chip seal. There is a configuration in which the chamber is formed so that the inside of the chip seal is hollowed out, the lower wall having a relatively small wall thickness is deformed, and a part is brought into close contact with the chip seal insertion groove, and the upper wall is floated. In the case of
It is possible to obtain a larger flying height than the conventional structure in which the cut notch portion is floated. Therefore, even if the tip seal is worn by use over a long period of time, the tip seal can be largely floated so as to compensate for the abrasion, so that reliability for long-term use can be improved. In any of the above configurations, the high-pressure side pressure acts upward on the upper wall of the pressure chamber, so that this pressure can be effectively used for floating. Therefore, as compared with the conventional structure in which the cut portion is levitated, it is possible to reliably levitate even at a relatively small ambient pressure, thereby improving the levitating characteristics. Further, unlike the conventional structure in which a notch is inserted and the surface floats due to deformation due to a change in atmospheric pressure, any of the above structures floats due to the shape unique to the tip seal before operation. Therefore, any of the configurations allows the tip seal shape to be formed by a mold, so that there is no difficulty in manufacturing unlike the conventional structure, and it is suitable for mass production.

In addition, by using the pressure difference between the high pressure side and the low pressure side with the tip seal sandwiched therebetween, the tip seal is floated, so that the conventional structure in which the discharge pressure is used as the pressure used for floating the tip seal and high pressure is wasted. In comparison, a reduction in compression efficiency can be prevented.

Preferably, in the scroll compressor, the tip seal has two parts: a lower member mounted on a bottom side of the groove for inserting the tip seal, and an upper member mounted on the lower member. And the plurality of pressure chambers are formed between the lower member and the upper member.

More preferably, in the scroll compressor, substantially rectangular irregularities are formed on the lower surface of the upper member and the upper surface of the lower member, respectively, and these are substantially fitted to each other. A scroll compressor comprising the plurality of pressure chambers is provided.

Preferably, in the scroll compressor, substantially sawtooth-shaped irregularities are formed on the lower surface of the upper member and the upper surface of the lower member, respectively, and these are substantially fitted to each other. A scroll compressor comprising the plurality of pressure chambers is provided.

Preferably, in the scroll compressor, the lower surface of the tip seal and the upper surface of the groove for inserting the tip seal are respectively formed with irregularities, and these are substantially fitted to each other. A scroll compressor comprising a plurality of pressure chambers is provided.

[0016] More preferably, in the scroll compressor, the unevenness formed on the lower surface of the upper member and the upper surface of the lower member is substantially rectangular.

Preferably, in the scroll compressor, the unevenness formed on the lower surface of the upper member and the upper surface of the lower member is substantially saw-toothed.

Preferably, in the scroll compressor, the unevenness formed on the lower surface of the tip seal is:
The scroll compressor is provided, wherein the projections and depressions formed on the upper surface of the chip seal insertion groove are cylindrical holes into which the columnar projections are substantially fitted.

Preferably, in the scroll compressor, each of the plurality of pressure chambers is formed so as to communicate with both wall directions of the groove for inserting a tip seal and to hollow the inside of the tip seal. Further, a scroll compressor is provided, wherein the thickness of the lower wall is smaller than the thickness of the upper wall of the pressure chamber.

[0020] More preferably, in the scroll compressor, there is provided a scroll compressor in which a portion of a lower wall of the pressure chamber, which is in contact with the tip seal insertion groove, is cut off. You.

Preferably, in the scroll compressor, a linear projection along a depth direction of the chip seal insertion groove is provided on a side surface of the chip seal facing the high pressure side wall surface of the chip seal insertion groove. A scroll compressor is provided, wherein a plurality of pressure chambers are provided, and communication between the plurality of pressure chambers is substantially prevented by these projections.

Preferably, in the scroll compressor, a plurality of linear projections are provided on the high-pressure side wall surface of the groove for inserting the tip seal along a depth direction of the groove for inserting the tip seal. A scroll compressor is provided which substantially prevents communication between the plurality of pressure chambers.

Preferably, in the scroll compressor, the tip seal insertion groove is formed by casting.

[0024]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a first embodiment of the present invention.
This will be described with reference to FIG. FIG. 2 is a side sectional view showing the structure of the scroll compressor according to the present embodiment. In FIG.
A substantially spiral fixed scroll 8 is fixed to a frame 104 fixed to the closed container 101 via a plurality of bolts 114. The shaft 11 inserted into the main bearing 104a at the center of the frame 104 is
The substantially spiral orbiting scroll 9 driven by the eccentric boss portion 112a at the upper part of the second gear 2 engages to form the compression chamber 106. Then, the gas sucked from the suction pipe 109 is compressed in the compression chamber 106 by the swinging motion of the orbiting scroll 9 due to the rotational drive of the shaft 112, and is discharged to the upper portion of the fixed scroll 8 from the discharge hole 102k.
The gas once enters the motor chamber, cools the motor and separates the lubricating oil contained in the gas, and then flows out of the compression through the discharge pipe 122. Here, how to reduce the gap between the orbiting scroll 9 and the fixed scroll 8 is an issue for improving the compression performance of the scroll compressor. Particularly, in the case of a scroll compressor that compresses a dry gas in which lubricating oil such as air is not mixed, a liquid film of lubricating oil or the like is not formed in a gap formed by the orbiting scroll 9 and the fixed scroll 8, so that the gap is made as small as possible. Doing so leads to improved compressor performance. In particular, the gap between the end of the wrap 9A of the orbiting scroll 9 and the end plate 8B of the fixed scroll 8, the wrap 8A of the fixed scroll 8 and the end plate 9B of the orbiting scroll 9
In some cases, the pressure difference between the two sides may be about 0.3 MPa. Therefore, in order to seal this gap, a chip seal 10 as a sealing object is used.
0 is provided. The main part of the present embodiment lies in the structure of the tip seal 100.

With respect to the tip seal 100, the end plate 8 of the fixed scroll 8 at the end of the wrap 9A of the orbiting scroll 9
1 and 3 will be described by taking an example provided at a portion facing B as an example. FIG. 1 is a perspective view showing the structure of the orbiting scroll 9 and the tip seal, and FIG.
It is a middle AA transverse sectional view. 1 and 3, the tip seal 100 is disposed in a seal groove 4 having a U-shaped cross section formed along the spiral direction at the end of the wrap 9A of the orbiting scroll 9, and moves from the high pressure side to the low pressure side. The tip seal upper member 2 and the tip seal lower member 1 are divided along the spiral direction of the wrap 9A of the orbiting scroll 9, and compressed gas is interposed between the members 1 and 2. Pressure chamber 5,5 'for introducing pressure
Is provided.

The chip seal lower member 1 is mounted on the bottom side of the seal groove 4, and the upper member 2 is placed on the lower member 1. Tip seal upper member 2
And the upper surface of the chip seal lower member 1 are formed with rectangular irregularities to be fitted to each other.
5 'is formed in a gap portion of the fitting. In addition, on the inner surfaces of the spirals of the upper and lower members 1 and 2 (side surfaces facing the high-pressure side wall surfaces of the seal grooves 4), linear blow-through prevention protrusions 3 along the depth direction of the seal grooves 4 are provided. Are formed, and 2 on both sides of the seal groove 4 are formed.
Of the two wall surfaces, ie, the inner seal wall 4i and the outer seal wall 4o, the outer seal wall 4o has a function of pressing the tip seal upper / lower members 1, 2, and the inner seal wall 4i and the tip seal upper / lower members 1, 2. It also has the effect of making it difficult for compressed gas to blow through the gap between the two. Further, the tip seal members 1 and 2 are provided with the wrap 9A of the orbiting scroll 9 and the tip seal 100 by operating the compressor.
When the temperature rises, thermal expansion occurs. In order to maintain a stable meshing state of the tip seal upper and lower members 1 and 2 at this time, both tip seal members 1 and 2
Preferably, they are made of the same material or made of a material having a similar linear expansion coefficient.

A plurality of pressure chambers 5, 5 'are arranged alternately in the spiral direction, and the gaps c, c' in the spiral direction are extremely small compared to their thicknesses d, d '. ing. Due to this and the provision of the above-described projections 3, the pressure chambers 5 and 5 'are almost in a state where communication with each other is substantially prevented, and gas on the high pressure side is supplied to the upper and lower members 1 and 2 of the tip seal. It does not blow through. In the above configuration, when the scroll compressor starts operating, the high-pressure side compressed gas passes through the gap between the inner seal wall 4 i formed by the blow-through prevention protrusion 3 and the tip seal lower member 2, and the compression chambers 5 and 5. While leaking through a gap between the upper surface 2a of the tip seal upper member 2 and the wrap end plate 8B of the fixed scroll 8. But,
Since there is a pressure difference between both sides of the tip seal upper and lower members 1 and 2, the upper surface 2a of the tip seal upper member 2
The pressure in the gap between the head plate 8B and the end plate 8B is slightly smaller than the high pressure side pressure. The sum of the areas of the pressures smaller than the high pressure side is a force for pushing down the tip seal upper member 2 downward (toward the groove bottom). On the other hand, the sum of the areas of the high pressures that have entered the pressure chambers 5 and 5 ′ pushes up the tip seal upper member 2. Therefore, the force for pushing up the tip seal upper member 2 is greater than the force for pushing down. The frictional force generated when the tip seal upper member 2 rises by rubbing the inside of the seal groove 4 is sufficiently reduced by setting the friction coefficient between the two to about 0.1 or less. According to such a principle, when the scroll compressor starts operating, the tip seal upper member 2 floats and comes into contact with and slides on the end plate 8B to prevent leakage. FIG. 1 shows this floating state.

According to the present embodiment configured as described above, the following operational effects can be obtained. That is, the plurality of pressure chambers 5, 5 'are formed in the substantially spiral direction of the tip seal 100.
The high pressure side pressure at the position in the spiral direction is introduced into these pressure chambers 5 and 5 ′ to float the tip seal upper member 2 and perform sealing. As a result, it is possible to obtain a larger flying height than a conventional structure in which a notch is formed by the cut and the surface is floated by deformation due to a change in the atmospheric pressure. Therefore, even if the upper surface 2a of the tip seal upper member 2 is worn by the use of the tip seal 100 for a long period of time, the tip seal upper member 2 always receives a force from the compressed gas and can float greatly so as to compensate for the wear. ,
Stable sealing performance can be exhibited without forming a gap between the mirror plate 8B. Therefore, reliability for long-term use can be improved. Further, since the high-pressure side pressure acts upward on the upper walls of the pressure chambers 5, 5 ', this pressure can be effectively used for floating. Therefore, as compared with the conventional structure in which the notch is formed diagonally, the floating is ensured even at a relatively small ambient pressure, and the floating characteristics can be improved. Furthermore, unlike the conventional structure in which the notch is cut diagonally, the tip seal 100 floats due to the shape unique to the tip seal 100 before operation. Therefore, since the shape of the tip seal 100 can be formed by a mold, there is no difficulty in manufacturing unlike the conventional structure, and it is suitable for mass production. In addition, by using the pressure difference between the high pressure side and the low pressure side with the tip seal 100 interposed therebetween, the tip seal 100 is floated, so that the discharge pressure is used as the pressure used when the tip seal 100 is floated, and a high pressure is wasted. However, a decrease in compression efficiency can be prevented.

The above configuration, operation and effect are as follows.
Regarding the tip seal 100, the orbiting scroll 9 wrap 9
A description has been given of an example in which the tip A is provided at a portion facing the fixed scroll 8 end plate 8B.
The reference numeral 00 is also provided on a portion of the fixed scroll 8 wrap 8A at the distal end thereof facing the orbiting scroll 9 end plate 9B. Although not particularly described, they also perform the same operation with the same configuration, and have the same effect.

The configuration of the present embodiment is not limited to the above, and various modifications are possible. These modifications will be described with reference to FIGS. FIGS. 4 and 5 are perspective views showing the structure of the tip seal according to the two modified examples, respectively. FIGS. 4 and 5 correspond to the upper half of FIG. The same components as those in FIG. 1 are denoted by the same reference numerals. The configuration shown in FIG. 4 and FIG. 5 is such that the pressure chamber 5 or 5 ′ between the tip seal upper and lower members 1 and 2 can be formed stably before the operation of the compressor. That is, in FIG. 4, the height 1e of the rectangular projection of the tip seal lower member 1 and the height 2e of the rectangular projection of the tip seal upper member 2 are set to different values, so that the pressure is maintained even before the compressor is operated. A chamber 5 is formed to improve the floating characteristics of the tip seal upper member 2. Also, in FIG. 5, a spring mechanism 1 is provided between the rectangular uneven surfaces of the tip seal upper / lower members 1 and 2.
The pressure chambers 5 and 5 'can be positively configured even before the operation, and the floating characteristics of the tip seal upper member 2 can be improved by this method. In addition,
Even if a small projection or the like is used in addition to the spring mechanism 1f, the stable floating characteristics of the tip seal upper member 2 can be obtained, and the floating force can be increased.

A second embodiment of the present invention will be described with reference to FIG. FIG. 6 is a perspective view showing a structure of a tip seal 200 which is a main part structure of the scroll compressor according to the present embodiment. FIG. 6 is a diagram substantially corresponding to the upper half of FIG. 1 of the first embodiment. The same components as those in the first embodiment are denoted by the same reference numerals. In FIG. 6, the first
The difference from the first embodiment is that the tip seal member 1 of FIG.
That is, a large number of blow-through prevention protrusions 3 formed at 2 are formed at regular intervals. Other configurations are almost the same as those of the first embodiment.

According to the present embodiment, in addition to the same effects as in the first embodiment, the gap between the inner seal wall 4i on the high pressure side and the chip seal upper and lower members 1, 2 opposed thereto is swirled. Since the amount of compressed gas that blows through the air can be further reduced, the compression performance can be improved.

A third embodiment of the present invention will be described with reference to FIG. FIG. 7 is a perspective view showing the structure of the tip seal 300, which is the main structure of the scroll compressor according to the present embodiment. FIG. 6 is a diagram substantially corresponding to FIG. 6 of the first embodiment and FIG. 6 of the second embodiment. Components equivalent to those in the first and second embodiments are denoted by the same reference numerals. In FIG. 7, the main difference from the first embodiment is that serrated (triangular) projections 2 g and 1 g are provided on opposing surfaces of the tip seal upper and lower members 1 and 2.
That is, they are formed so as to mesh with each other. As a result, the pressure chambers 5 and 5 'provided between the upper and lower members 1 and 2 for introducing the high pressure side pressure are arranged in a lightning bolt.

The other points include that the blow-through preventing projection 3 is formed only on the surface of the chip seal members 1 and 2 facing the high pressure side inner seal wall 4i, which is almost the same as that of the first embodiment. The same is true.

According to this embodiment, as in the first embodiment, the high pressure side pressure can be introduced into the pressure chamber 5 at the same time as the operation of the compressor is started, so that the tip seal upper member 2 can be stably floated. it can. Further, the gap between the opposing surfaces 1h and 2h of both tip seal members 1 and 2 can be reduced, and there is also an effect that the amount of blow-by gas in the spiral direction can be reduced.

The configuration of the present embodiment is not limited to the above, and various modifications are possible. These modifications will be described with reference to FIGS. FIGS. 8 and 9 are perspective views showing the structure of the tip seal according to the two modified examples, respectively. FIGS. 8 and 9 are diagrams substantially corresponding to FIG. The same components as those in FIG. 7 are denoted by the same reference numerals.

First, in the configuration shown in FIG. 8, a spring mechanism 10 is provided in the pressure chamber 5 between the tip seal members 1 and 2 so that the two tip seal members 1 and 2 are displaced in the spiral direction. . With this configuration, a part of the spring force of the spring mechanism 10 can be used as the floating force of the tip seal upper member 2, so that more stable floating characteristics can be realized.

The configuration shown in FIG. 9 is different from the embodiment shown in FIG. 7 in that a large number of blow-through prevention protrusions 3 are formed at regular intervals. With this structure, the amount of compressed gas that flows through the gap between the inner seal wall 4i on the high-pressure side and the chip seal upper and lower members 1, 2 facing it in the spiral direction can be further reduced, so that the compression performance can be improved.

In each of the configurations shown in FIGS.
It is needless to say that using the same material for the upper and lower members 1 and 2 with the same coefficient of linear expansion, or using the same material, can maintain a good meshing state even when the temperature changes.

FIG. 10 and FIG. 1 show a fourth embodiment of the present invention.
1 will be described. FIG. 10 is a perspective view showing a structure of a tip seal 400 which is a main part structure of the scroll compressor according to the present embodiment, and FIG.
Shown in FIGS. 10 and 11 correspond to the upper half of FIG. 1 and FIG. 3 of the first embodiment, respectively. The same components as those in the first to third embodiments are denoted by the same reference numerals. 10 and 11, the difference from the first embodiment is that the width W of the chip seal lower member 1 in the groove width direction is the same as the groove width in the seal groove 4 to prevent blow-through from the side surface of the chip seal lower member. That is, the protrusion 3 is eliminated. Other points are almost the same as those of the first embodiment. In this structure, it is preferable that the material is selected so that the linear expansion coefficients of the upper and lower tip seal members 1 and 2 are substantially the same.

According to this embodiment, the same effects as those of the first embodiment can be obtained. In addition, since the amount of compressed gas that blows through the gap between the inner seal groove wall 4i on the high pressure side and the chip seal upper and lower members 1 and 2 facing the inner seal groove wall 4i in the spiral direction can be further reduced, the compression performance is improved. Can be Further, since the chip seal lower member 1 mounted in the seal groove 4 does not come off, there is an effect that the mounting operation of the seal member is facilitated.

The configuration of the present embodiment is not limited to the above, and various modifications are possible. These modifications will be described with reference to FIGS. The perspective views showing the structure of the tip seal according to the three modified examples are shown in FIGS.
As shown in FIG. 12 to 14 are diagrams substantially corresponding to FIG. The same components as those in FIG. 12 are denoted by the same reference numerals.

The structure shown in FIG. 12 is different from the structure shown in FIG. 10 in that a large number of blow-through prevention protrusions 3 are formed at regular intervals on the surface of the tip seal upper member 2 facing the high pressure side inner seal wall 4i. It was done. With this configuration, the amount of blow-through of the compressed gas along the spiral direction in the gap between the inner seal wall 4i and the opposing tip seal upper / lower members 1 and 2 can be further reduced, so that the compression performance can be improved.

The configuration shown in FIG. 13 is obtained by applying the basic concept of this embodiment to the configuration of the third embodiment.
In the tip seal 300 of the third embodiment shown in FIG. 7, the width of the tip seal lower member 1 is made the same as the groove width in the seal groove 4, and the blow-through prevention projection 3 of the tip seal lower member 1 is omitted. Structure. FIG.
In the configuration shown in FIG. 13, a large number of blow-through prevention protrusions 3 are formed at regular intervals in the configuration shown in FIG. 13 and 14, the amount of blow-by gas in the spiral direction between the high pressure side inner seal wall 4i and the seal upper member 2 facing the inner seal wall 4i can be reduced, so that the performance of the compressor can be improved. In addition, since the chip seal lower member 1 mounted in the seal groove 4 does not come off, the mounting operation of the seal lower member 1 is facilitated.

FIGS. 15 and 1 show a fifth embodiment of the present invention.
6 will be described. FIG. 15 is an exploded perspective view showing the structure of a tip seal 500, which is a main part structure of the scroll compressor according to the present embodiment, and FIG. 16 is a cross-sectional view taken along the line DD in FIG. FIGS. 15 and 16 respectively show the first
FIG. 4 is a view substantially corresponding to FIG. 3 and FIG. 3 of the embodiment of FIG. The same components as those in the first to fourth embodiments are denoted by the same reference numerals. 15 and FIG.
The main points of difference from the first embodiment are that the tip seal lower member 1 is omitted, and that the rectangular irregularities 11 are fitted into the seal grooves 4 so as to substantially fit the rectangular irregularities on the lower surface of the tip seal upper member 2. Are formed to have the same width as the seal groove 4, and pressure chambers 5, 5 ′ for introducing a compressed gas are provided between the rectangular irregularities 11 and the chip seal upper member 2. The projection 3 for preventing the compressed gas from escaping in the spiral direction only on the surface opposing the inner seal wall 4i.
Is provided. The rectangular irregularities 11 of the seal groove 4 can be easily formed by using a method such as casting.

Other configurations are almost the same as those of the first embodiment.

According to this embodiment, as in the first embodiment, the tip seal upper member 2
, And stable sealing characteristics can be obtained.

In the fifth embodiment, if the orbiting / fixed scrolls 9 and 8 are made of aluminum or other metal material and the material of the tip seal upper / lower members 1 and 2 is made of a resin material, the temperature may be lowered. The gaps c and c ′ (see FIG. 15) need to be slightly increased because there is a possibility that the rectangular unevenness may not be engaged due to the thermal expansion difference due to the change. However, when the wraps 8A, 9A are formed of a resin material, the linear expansion coefficients of the chip seal upper member 2 and the rectangular irregularities 11 are substantially the same, so that the gaps c, c 'need not be increased. Further, similarly to the first embodiment, thicknesses d and d ′ and gaps c and c ′ in the spiral direction are determined,
A configuration in which a slight gap is provided between the tip seal upper member 2 and the rectangular unevenness 11 may be employed.

The configuration of the present embodiment is not limited to the above, and various modifications are possible. These modifications will be described with reference to FIGS. FIGS. 17 to 17 are perspective views showing the structure of the tip seal according to the three modifications.
As shown in FIG. 17 to 19 are diagrams substantially corresponding to FIG. The same components as those in FIGS. 15 and 16 are denoted by the same reference numerals.

The structure shown in FIG. 17 is different from the structure shown in FIG. 15 in that the blow-through preventing projection 3 provided on the surface of the tip seal upper member 2 which faces the inner seal wall 4i on the high pressure side.
Are formed at regular intervals. With this configuration, the amount of blow-through of the compressed gas along the spiral direction in the gap between the inner seal wall 4i and the tip seal upper member 2 facing the inner seal wall 4i can be further reduced, so that the compression performance can be improved.

The configuration shown in FIG. 18 is obtained by applying the basic concept of this embodiment to the configuration of the third embodiment.
In the tip seal 300 of the third embodiment shown in FIG. 7, the width of the tip seal upper member 2 is made equal to the groove width in the seal groove 4, the tip seal lower member 1 is omitted, and On the other hand, saw-toothed irregularities 21 are formed so as to substantially fit with the serrated (triangular) projections 2g of the tip seal upper member 2, and compressed gas is injected between the saw-tooth irregularities 21 and the tip seal upper member 2. Pressure chamber 5,5 'to be introduced
It is a structure provided with. Further, the configuration shown in FIG.
In the configuration shown in FIG. 8, a large number of blow-by prevention protrusions 3 are formed at regular intervals. 18 and 19
In both structures, the amount of blow-through gas in the spiral direction between the inner seal wall 4i on the high pressure side and the seal upper member 2 facing the same can be reduced, so that the performance of the compressor can be improved. In addition,
By adjusting the coefficient of linear expansion by, for example, using the same material for the tip seal upper member 2 and the scroll wrap, the meshing of the saw-tooth irregularities when the temperature rises can always be maintained in a good state.

The sixth embodiment of the present invention will be described with reference to FIGS.
1 will be described. FIG. 20 is a perspective view showing a structure of a tip seal 600, which is a main part structure of the scroll compressor according to the present embodiment, and FIG.
Shown in FIGS. 20 and 21 are diagrams substantially corresponding to the upper half of FIG. 1 and FIG. 3 of the first embodiment, respectively. The same components as those in the first to fifth embodiments are denoted by the same reference numerals. 20 and 21, the main difference from the first embodiment is that the tip seal upper member 2
A cylindrical projection 33 formed on the lower surface of the chip seal, the chip seal lower member 1 is omitted, and a cylinder that fits substantially in the seal groove 4 with the cylindrical projection 33 on the lower surface of the chip seal upper member 2. A pressure chamber 5 for introducing a compressed gas between the seal upper member 2 and the seal groove 4.
5 'is provided, the protrusion 3 for preventing the compressed gas from flowing in the spiral direction is provided only on the surface of the tip seal upper member 2 (including the cylindrical protrusion 33) facing the inner seal wall 4i. That is. At this time, the diameter d of the columnar projection 33 is made substantially equal to the width of the tip seal upper member 2. Other configurations are almost the same as those of the first embodiment. According to the present embodiment, as in the first embodiment, a compression chamber is formed between the tip seal upper member 2 and the seal groove 4, and gas on the high pressure side is introduced into the compression chamber to stabilize the seal member. Surface. The cylindrical hole 31 formed at the bottom of the seal groove 4 is formed by intermittently changing the axial direction (the depth direction of the seal groove 4) of the end mill when the seal groove 4 is processed by the end mill. It can be easily processed. Alternatively, the cylindrical hole 31 of the seal groove 4 can be easily formed by casting when forming the wrap 9A of the scroll.

In the sixth embodiment as well, the scroll wrap 9A and the tip seal are formed by making the linear expansion coefficients of the members approximately the same or by increasing the radial gap between the cylindrical hole 31 and the cylindrical projection 33. The engagement between the cylindrical hole 31 and the cylindrical projection 33 can be prevented from being disturbed by the difference in thermal expansion due to the temperature rise of 600.

A seventh embodiment of the present invention will be described with reference to FIG. FIG. 22 is a perspective view showing the structure of the tip seal 700, which is a main structure of the scroll compressor according to the present embodiment, and FIG. This FIG.
FIG. 4 is a view substantially corresponding to FIG. 3 and FIG. 3 of the embodiment of FIG. The same components as those in the first to sixth embodiments are denoted by the same reference numerals. In FIG. 22, the main difference from the first embodiment is that a chip seal member 42 that is not divided into upper and lower parts is inserted into the seal groove 4, and the inside of the chip seal member 42 has a high pressure side of the chip seal member 42. The pressure chamber 41, which is a plurality of rectangular cylindrical spaces, is formed so as to communicate with the low pressure side and penetrate the tip seal member 42, and the lower wall portion 4 is thicker than the pressure chamber upper wall portion 42U.
This is to reduce the thickness of 2L. A plurality of blow-through prevention protrusions 3 are formed on the surface of the chip seal member 42 facing the inner seal wall 4i on the high pressure side. Other configurations are almost the same as those of the first embodiment.

According to the present embodiment, similarly to the first embodiment, the tip seal member 42 is pressed against the outer seal wall 4o on the low pressure side by the projection 3, and the high pressure gas enters the pressure chamber 41 when the compressor starts operating. Penetration, chip seal member 4
2, the lower wall portion 42L having a small thickness is deformed and the upper wall portion 42U is floated while a part of the lower wall portion 42L is brought into close contact with the bottom of the seal groove 4, so that good sealing characteristics can be achieved.

The configuration of the present embodiment is not limited to the above, and various modifications are possible. These modifications will be described with reference to FIGS. FIGS. 23, 24, 25, 26, and 2 respectively show perspective views (including partial cross-sectional views) showing the structure of the tip seal according to the five modified examples.
FIG. These are all diagrams substantially corresponding to FIG. The same components as those in FIG. 22 are denoted by the same reference numerals. The configuration shown in FIG. 23 is a configuration in which the shape of the pressure chamber 41 in FIG. 22 is cylindrical, and this configuration can also achieve stable floating of the tip seal and good sealing performance.

The configurations shown in FIGS. 24 and 25 are the same as those shown in FIGS. 22 and 23, respectively.
A large number of protrusions 3 for preventing blow-through on the side surfaces of the two are provided at predetermined intervals. As a result, the amount of compressed gas blow-through in the scroll spiral direction is reduced, and the performance of the compressor can be further improved.

The configurations shown in FIGS. 26 and 27 are different from the configurations shown in FIGS. 24 and 25, respectively, in that a cut portion 43 is formed at the bottom of the tip seal member 42 in a direction perpendicular to the spiral direction. With this configuration, the lower wall 42L of the pressure chamber of the chip seal member 42 is easily deformed, so that there is an effect that the floating characteristics of the chip seal member 42 are further improved and the seal characteristics are further improved.

An eighth embodiment of the present invention will be described with reference to FIG. FIG. 28 is a perspective view illustrating a structure of a tip seal 800, which is a main part structure of the scroll compressor according to the present embodiment. This embodiment corresponds to a further modification of the configuration of the modification of the seventh tip seal 700 shown in FIG. The same components as those in the first to seventh embodiments are denoted by the same reference numerals. In FIG. 28, the main points different from the configuration of FIG. 23 are as follows. That is, a substantially cylindrical pressure chamber 41 formed so as to communicate in a direction perpendicular to the scroll spiral direction is provided inside the tip seal member 42, and the lower wall 4 below the pressure chamber 41 is provided.
Of the 2L, a portion near the bottom surface of the seal groove 4 has an arc shape with a reduced wall thickness so as to surround the outer periphery of the pressure chamber 41, and a notch 42La is provided near a portion in contact with the bottom surface of the seal groove 4. Are formed. In the tip seal member 42, on the side surface facing the high pressure side inner seal wall 4i, a projection 3 for preventing blow-through of pressure gas in the spiral direction of the scroll wrap is provided as in FIG. The blow-through prevention projection 3 is formed continuously from the upper end of the tip seal member 42 to the tip of the pressure chamber lower wall 42L, so as to further reduce the blow-through of the pressure gas in the spiral direction. Other configurations are shown in FIG.
The configuration is almost the same as that of FIG.

According to this embodiment, the same effects as those of the first embodiment can be obtained. In addition, when the tip seal member 42 is mounted in the seal groove 4, by bending the arc-shaped portion of the lower wall 42 </ b> L forming the pressure space 41, the elastic restoring force can be used as a floating force of the tip seal. Therefore, the sealing performance is further improved.

In the first to eighth embodiments described above, the protrusions 3 for preventing compressed gas blow-through in the spiral direction are formed on the side surfaces of the chip seal upper / lower members 1 and 2 and the chip seal member 42. A configuration in which this blow-by is prevented by another configuration without providing is also conceivable. This modification is shown in FIG.
9 will be described. The same reference numerals are given to the same components as those in the already described figures. FIG. 29 is a perspective view showing the structure of the orbiting scroll 9 and the tip seal according to this modification. The inner surface of the seal groove 4 of the scroll wrap 9A on the high pressure side inside the seal wall 4i extends along the depth direction of the groove 4. A plurality of linear projections 83 are formed. Note that blow-through prevention projections 83 formed on the inner walls of these seal grooves 4.
Can be manufactured while shaking the cutting tool when forming the seal groove 4 by machining, or can be integrally formed when the seal groove 4 is formed by casting or the like.

According to this configuration, the protrusion 3 for preventing blow-through on the tip seal side (described above) becomes unnecessary. In FIG. 29, the seal groove 4 at the tip of the wrap 9A of the orbiting scroll 9A has been described as an example, but it goes without saying that the same configuration can be applied to the seal groove provided at the tip of the fixed scroll 8 wrap 8A.

[0063]

According to the present invention, at least a portion above the pressure chamber of the chip seal floats and seals, so that a larger floating amount can be obtained than in the conventional structure in which the cut notch portion is floated. it can. Therefore, reliability for long-term use can be improved. In addition, since the high pressure side pressure can be effectively used for floating, floating can be ensured even at a relatively small ambient pressure, and the floating characteristics can be improved. Further, since the tip seal shape can be formed by a mold, it is suitable for mass production. In addition, since the floating is performed using the pressure difference between the high pressure side and the low pressure side with the tip seal interposed therebetween, it is possible to prevent a decrease in compression efficiency.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating a structure of an orbiting scroll and a tip seal provided in a scroll compressor according to a first embodiment of the present invention.

FIG. 2 is a side sectional view illustrating a structure of a scroll compressor.

FIG. 3 is a cross-sectional view taken along a line AA in FIG.

FIG. 4 is a perspective view illustrating a structure of a tip seal according to a modification.

FIG. 5 is a perspective view illustrating a structure of a tip seal according to a modification.

FIG. 6 is a perspective view illustrating a structure of a tip seal, which is a main part structure of a scroll compressor according to a second embodiment of the present invention.

FIG. 7 is a perspective view illustrating a structure of a tip seal, which is a main part structure of a scroll compressor according to a third embodiment of the present invention.

FIG. 8 is a perspective view illustrating a structure of a tip seal according to a modification.

FIG. 9 is a perspective view illustrating a structure of a tip seal according to a modification.

FIG. 10 is a perspective view illustrating a structure of a tip seal, which is a main part structure of a scroll compressor according to a fourth embodiment of the present invention.

11 is a cross-sectional view taken along the line BB in FIG.

FIG. 12 is a perspective view illustrating a structure of a tip seal according to a modification.

FIG. 13 is a perspective view illustrating a structure of a tip seal according to a modification.

FIG. 14 is a perspective view illustrating a structure of a tip seal according to a modification.

FIG. 15 is an exploded perspective view showing a structure of a tip seal, which is a main part structure of a scroll compressor according to a fifth embodiment of the present invention.

16 is a cross-sectional view taken along the line DD in FIG.

FIG. 17 is a perspective view illustrating a structure of a tip seal according to a modification.

FIG. 18 is a perspective view illustrating a structure of a tip seal according to a modification.

FIG. 19 is a perspective view illustrating a structure of a tip seal according to a modification.

FIG. 20 is a perspective view illustrating a structure of a tip seal, which is a main part structure of a scroll compressor according to a sixth embodiment of the present invention.

21 is a cross-sectional view taken along the line EE in FIG.

FIG. 22 is a perspective view showing a structure of a tip seal, which is a main structure of a scroll compressor according to a seventh embodiment of the present invention, and a cross-sectional view taken along a line FF.

FIG. 23 is a perspective view and a GG transverse sectional view showing a structure of a tip seal according to a modification.

FIG. 24 is a perspective view and a cross-sectional view taken along the line HH showing the structure of a tip seal according to a modification.

FIG. 25 is a perspective view and a JJ transverse sectional view showing a structure of a tip seal according to a modification.

FIG. 26 is a perspective view illustrating a structure of a tip seal according to a modification.

FIG. 27 is a perspective view illustrating a structure of a tip seal according to a modification.

FIG. 28 is a perspective view illustrating a structure of a tip seal, which is a main part structure of a scroll compressor according to an eighth embodiment of the present invention.

FIG. 29 is a perspective view illustrating a structure of a turning scroll and a tip seal according to a modification.

[Explanation of symbols]

 Reference Signs List 1 Chip seal lower member 1f Spring mechanism 1g Serrated protrusion 1h Chip seal lower member facing surface 2 Chip seal upper member 2a Chip seal upper member upper surface 2g Serrated protrusion 2h Chip seal upper member facing surface 3 Blow-out prevention protrusion 4 Seal groove 4i Inner seal wall 4o Outer seal wall 5, 5 'Pressure chamber 8 Fixed scroll 8A Scroll wrap 8B End plate 9 Orbiting scroll 9A Scroll wrap 9B End plate 10 Spring mechanism 11 Rectangular unevenness 21 Serrated unevenness 31 Cylindrical hole 33 Cylindrical projection 41 Pressure Chamber 42 Chip seal member 43 Cut part 63A Wall 83 Protrusion 100 Chip seal 200 Chip seal 300 Chip seal 400 Chip seal 500 Chip seal 600 Chip seal 700 Chip seal 800 Chip seal

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kazuaki Shiiki 390 Muramatsu, Shimizu-shi, Shizuoka Prefecture Inside Air Conditioning Systems Division, Hitachi, Ltd. (72) Inventor Isamu Kawano 390 Muramatsu, Shimizu-shi, Shizuoka Prefecture Air Conditioning System, Hitachi, Ltd. Within the business division

Claims (13)

[Claims] An orbiting scroll member and a fixed scroll member having a substantially spiral shape; a portion of the orbiting scroll member facing the end plate of the fixed scroll; and a portion of the fixed scroll member facing the end plate of the orbiting scroll. A chip seal insertion groove formed substantially along the spiral direction, and a chip seal attached to the chip seal insertion groove to prevent gas leakage from the high pressure side to the low pressure side. In the scroll compressor provided, a plurality of pressure chambers that are substantially prevented from communicating with each other in the substantially spiral direction of the tip seal, and a high-pressure side in a spiral direction position where each of the pressure chambers is provided. A scroll compressor for introducing pressure into the pressure chamber. 2. The scroll compressor according to claim 1, wherein said tip seal comprises a lower member mounted on a bottom side of said tip seal insertion groove, and an upper member mounted on said lower member. Wherein the plurality of pressure chambers are formed between the lower member and the upper member. 3. The scroll compressor according to claim 2, wherein substantially rectangular irregularities are formed on the lower surface of said upper member and the upper surface of said lower member, respectively, and these are substantially fitted to each other. A scroll compressor, wherein the plurality of pressure chambers are formed in a portion. 4. The scroll compressor according to claim 2, wherein substantially sawtooth-shaped irregularities are formed on the lower surface of said upper member and the upper surface of said lower member, respectively, and these are substantially fitted to each other. A scroll compressor, wherein the plurality of pressure chambers are formed in a portion. 5. The scroll compressor according to claim 1, wherein the lower surface of said tip seal and the upper surface of said groove for inserting a chip seal are respectively formed with irregularities and are substantially fitted to each other. Wherein the plurality of pressure chambers are configured. 6. The scroll compressor according to claim 5, wherein the irregularities formed on the lower surface of said upper member and the upper surface of said lower member, respectively, are substantially rectangular. 7. The scroll compressor according to claim 5, wherein the irregularities formed on the lower surface of the upper member and the upper surface of the lower member are substantially saw-toothed. 8. The scroll compressor according to claim 5, wherein the irregularities formed on the lower surface of said tip seal are cylindrical projections, and the irregularities formed on the upper surface of said groove for inserting a chip seal are circular. A scroll compressor having a cylindrical hole into which a columnar projection is substantially fitted. 9. The scroll compressor according to claim 1, wherein each of the plurality of pressure chambers is formed so as to communicate with both wall directions of the chip seal insertion groove and to hollow out the inside of the chip seal. And a thickness of the lower wall is smaller than a thickness of an upper wall of the pressure chamber. 10. The scroll compressor according to claim 9, wherein a portion of a lower wall of said pressure chamber which is in contact with said tip seal insertion groove is cut off. 11. The scroll compressor according to claim 1, wherein a side surface of the tip seal facing the high pressure side wall surface of the tip seal insertion groove has a linear shape along a depth direction of the tip seal insertion groove. A scroll compressor, wherein a plurality of projections are provided, and these projections substantially prevent communication between the plurality of pressure chambers. 12. The scroll compressor according to claim 1, wherein a plurality of linear projections are provided on the high-pressure side wall surface of the tip seal insertion groove along a depth direction of the tip seal insertion groove. A scroll compressor, wherein communication between the plurality of pressure chambers is substantially prevented by a projection. 13. The scroll compressor according to claim 1, wherein said groove for inserting a tip seal is formed by casting.