JPH11148471A - Scroll type fluid machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide intended energizing force by letting each tip seal energizing leach elastic body be formed out of a base which is roughly as wide as each tip seal groove while being extended to the longer direction of the tip seal groove, and of upper and lower projections in a fin shape each provided on the upper and lower surfaces of each base, and letting the upper and lower projections be overlapped with their parts at a position in a plane. SOLUTION: In this fluid machine, the spiral shaped scroll lap 1b of a turning scroll 1 and the spiral shaped scroll lap 2b of a stationary scroll 2, are fitted with each other so as to allow a compression space to be formed, and it is so constituted that each tip seal 3 and each elastic body 4 are fitted into the insides of tip seal grooves 1c and 2c at the tip ends of the respective scroll laps. In this case, the shape of each elastic body 4 is so constituted that an upper projection 4b and a lower projection 4c are provided on elastic body bases 4a so as to be overlapped with their parts.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elastic body for obtaining a biasing force of a tip seal in a scroll type fluid machine.

[0002]

2. Description of the Related Art In a conventional scroll type fluid machine,
The elastic body that urges the tip seal is described in JP-B-59-360.
No. 81, a rubber having a rectangular cross section,
Japanese Patent Application Laid-Open Nos. 60-30493 and 3-1
No. 49385, which is composed of a metal spring, and JP-A-64-24192 or JP-A-8-1.
There is one configured with a tube as disclosed in Japanese Patent Application Publication No. 0076.

[0003]

In a conventional scroll type fluid machine, if the elastic body for urging the tip seal is a rubber elastic body having a rectangular cross section, it is difficult to reduce the hardness of the rubber to a certain level or less. The biasing force of the tip seal has increased, leading to an increase in frictional force and wear. Further, the elastic body made of a metal spring cannot prevent the flow of the fluid in the chip seal groove, and thus has a problem that leakage occurs. Also, when a porous body is used, the surface area is large and the corrosion resistance is poor. Further, when the porous body is formed of an independent foam, the pressure difference between the pressure of the compressed fluid and the pressure inside the foam may cause a problem. There was a problem that the urging force could not be obtained. Further, in the case of the elastic body made of a tube, a pressure difference between the inside and the outside of the tube occurs during the operation of the scroll type fluid machine, a sufficient urging force cannot be obtained, and further, the flow of the compressed fluid in the longitudinal direction of the chip seal groove is prevented. There was a problem that can not be. Further, as another method for urging the tip seal against the surface of the other scroll end plate, a method of introducing a compressed fluid into the inside of the tip seal groove on the back surface of the tip seal as disclosed in Japanese Patent Publication No. 56-28240 has been adopted. However, in this method, when the scroll type fluid machine is used as a vacuum pump, no urging force is obtained because the pressure difference between the fluid pocket and the inside of the chip seal groove is small. There is a problem that can not be prevented.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems, reduce the urging force of the elastic body, reduce the frictional force and wear of the tip seal, suppress the required power and heat generation, and extend the life of the tip seal. And to reduce obstacles caused by wear powder.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an elastic body formed of a polymer material and a plate extending in the longitudinal direction of a chip seal groove, and upper and lower protrusions provided in a fin shape above and below the plate. And the upper projection and the lower projection are partially overlapped in the plane position of the plate.

The elastic member has a plate having a width substantially equal to the width of the chip seal groove and extending in the longitudinal direction of the chip seal groove, and upper and lower protrusions provided continuously in the form of fins above and below the plate. This is achieved by configuring to prevent flow in the groove of the tip seal.

It is also achieved by forming the elastic body from a polymer material having chemical resistance such as fluorine or silicon.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. The structure of the scroll type fluid machine is omitted because it is not an important point of the present invention. 1 and 2 show one embodiment of the present invention. In FIG. 1, a spiral scroll wrap 1b is provided upright from a head plate 1a of an orbiting scroll 1, a tip seal groove 1c is provided at the tip of the spiral scroll wrap 1b, and a tip seal 3 and a bottom of the tip seal groove 1c are provided in the tip seal groove 1c. An elastic body 4 for urging the tip seal 3 against the surface of the end plate 2a of the fixed scroll 2 is fitted between the end plate 2 and the tip seal 3, and a spiral scroll wrap 2b stands upright from the end plate 2a of the fixed scroll 2. A tip seal groove 2c is provided at the tip of the spiral scroll wrap 2b, and the tip seal 3 is provided between the tip seal 3 and the bottom of the tip seal groove 2c in the tip seal groove 2c. An elastic body 4 for urging the surface is fitted in the tip seal groove 1c of the orbiting scroll 1 and the tip seal of the fixed scroll 2. Le groove 2c
The elastic bodies 4 respectively fitted in the inside bias the respective tip seals 3 against the surfaces of the other scroll end plates 1a and 2a. FIG. 2 shows the structure of the elastic body 4 in FIG.
FIG. 2 is a view of the elastic body 4 as viewed from the chip seal 3 side. The elastic body 4 is formed of a polymer material, and the elastic substrate 4a extending in the longitudinal direction of the chip seal grooves 1c and 2c is provided with the chip seal groove 1c. , 2c, and a fin-shaped upper projection 4b is provided upright on the elastic substrate 4a. Further, the shape shown by the broken line in the figure indicates the lower protrusion 4c erected in a fin shape below the elastic substrate 4a, and the upper protrusion 4b and the lower protrusion 4c are represented by a, a in the figure.
The tip seals 3 are urged toward the scroll head plates 1a and 2a at these positions, that is, at positions b, c, d and e. The elastic body 4 can urge the tip seal 3 to the surface of the scroll end plates 1a and 2a with a desired urging force by arbitrarily adjusting the intervals of a, b, c, d, and e. The frictional force and the amount of wear can be reduced, and a long life of the tip seal can be achieved. Further, by forming the elastic body 4 from a polymer material such as fluorine or silicon, a scroll-type fluid machine having chemical resistance can be provided.

FIGS. 3 to 6 show other embodiments of the present invention. 3 to 6, the elastic body 4 is attached to the tip seal 3
FIG. 5 is a view from the side, in which the elastic body 4 is formed of a polymer material, and the elastic substrate 4a extending in the longitudinal direction of the chip seal grooves 1c and 2c has a width substantially equal to the width of the chip seal grooves 1c and 2c. A fin-shaped upper projection 4b is provided upright on the body substrate 4a. 3 to 6, the shape shown by the broken line indicates a lower projection 4c erected in a fin shape below the elastic substrate 4a extending in the longitudinal direction of the chip seal grooves 1c and 2c. Lower projection 4c
Are configured to overlap at positions a, b, c, d, e,... In the figure, and urge the tip seal 3 toward the scroll end plates 1a and 2a at this position. With such a structure, the elastic body 4 can adjust the tip seal grooves 1c and 2c in the longitudinal direction of the upper protrusions 4b and the lower protrusions 4c arbitrarily so that the tip seals 3 have a desired urging force.
Can be urged to the scroll end plates 1a and 2a,
The frictional force and wear of the tip seal can be reduced, and the long life of the tip seal can be achieved. Further, both the upper protrusion 4b and the lower protrusion 4c
The scroll type fluid machine has a shape in which the widthwise and longitudinal directions of the passages c and 2c are blocked, and can prevent the flow of the fluid inside the chip seal grooves 1c and 2c, and has a high compression efficiency. it can. Further, by forming the elastic body 4 from a polymer material such as fluorine or silicon, a scroll type fluid machine having corrosion resistance can be provided. 7 to 9 show an embodiment of the prior art. FIG. 7 shows a case where the elastic body 4 is formed of a coil spring. Since the chip seal grooves 1c and 2c are not blocked in both the width direction and the longitudinal direction, the chip seal groove 1
The flow of the fluid inside c and 2c cannot be prevented, and a scroll-type fluid machine with good compression efficiency cannot be provided. FIG. 8 shows a case where the elastic body 4 is formed from a tube, and the chip seal grooves 1c and 2c are blocked in the width direction, but are not blocked in the longitudinal direction. The flow of the internal fluid cannot be prevented, and a scroll-type fluid machine with high compression efficiency cannot be provided. Further, FIG. 9 shows the elastic body 4 formed of rubber having a square cross section or a porous body.
Although c and 2c are blocked in both the width direction and the longitudinal direction, the contact area of the tip seal 3 is large and the spring constant of rubber is large, so that a desired urging force cannot be obtained.
Further, the elastic body 4 made of a porous body is provided in the chip seal groove 1.
Since c and 2c are blocked in both the width direction and the longitudinal direction, and the spring constant of the foam can be set arbitrarily, a desired urging force can be obtained. However, since the surface area is large, the corrosion resistance is poor, Further, when the porous body is formed of an independent foam, a pressure difference is generated between the inside of the fluid machine and the inside of the foam during the operation of the fluid machine, and the foam expands or contracts. There was a disadvantage that it could not be obtained. According to the present invention, it is possible to provide a scroll fluid machine that eliminates all of the above problems and has excellent compression efficiency.

[0010]

According to the present invention, the elastic body made of a polymer material is formed by a plate extending in the longitudinal direction of the chip seal groove, and upper and lower protrusions provided in the form of fins above and below the plate. However, by making the upper projection and the lower projection partially overlap each other in the plane position of the plate, the urging force of the elastic body can be reduced, the frictional force and wear of the chip seal can be reduced, and the required power and heat generation are reduced. Can be suppressed, and the life of the tip seal can be prolonged and obstacles due to abrasion powder can be reduced. Further, the elastic body has a width substantially equal to the width of the chip seal groove, and a plate extending in the longitudinal direction of the chip seal groove, and upper and lower protrusions provided continuously in the form of fins above and below the plate, respectively. Thus, a scroll-type fluid machine with good compression efficiency can be provided. Further, by using the elastic body for biasing the tip seal formed of a polymer material having chemical resistance such as fluorine or silicon, a scroll type fluid machine excellent in corrosion resistance can be provided.

[Brief description of the drawings]

FIG. 1 is a partial sectional view showing one embodiment of a scroll type fluid machine according to the present invention.

FIG. 2 is a partial view showing an embodiment of a tip seal urging elastic body according to the present invention.

FIG. 3 is a partial view showing an embodiment of a tip seal urging elastic body according to the present invention.

FIG. 4 is a partial view showing an embodiment of a tip seal urging elastic body according to the present invention.

FIG. 5 is a partial view showing an embodiment of a tip seal urging elastic body according to the present invention.

FIG. 6 is a partial view showing an embodiment of a tip seal urging elastic body according to the present invention.

FIG. 7 is a partial sectional view showing a conventional scroll type fluid machine.

FIG. 8 is a partial sectional view showing a conventional scroll type fluid machine.

FIG. 9 is a partial sectional view showing a conventional scroll type fluid machine.

[Explanation of symbols]

1 is an orbiting scroll, 1a is an end plate of an orbiting scroll, 1
b is the spiral scroll wrap of the orbiting scroll, 1c is the tip seal groove of the orbiting scroll, 2 is the fixed scroll, 2a is the end plate of the fixed scroll, 2b is the spiral scroll wrap of the fixed scroll, 2c is the tip seal groove of the fixed scroll, 3 is a chip seal, 4 is an elastic body, 4a
Is an elastic substrate, 4b is an upper projection of the elastic body, and 4c is a lower projection of the elastic body.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shinichi Haruki 1060 Takeda, Hitachinaka-shi, Ibaraki Prefecture Within Hitachi Koki Co., Ltd.

Claims (3)

[Claims] An orbiting scroll wrap so as to stand up from the end plate of the orbiting scroll; and a spiral scroll wrap so as to stand up from the end plate of the fixed scroll.
A tip seal groove is provided at the tip of the wrap of the orbiting scroll and the fixed scroll so as to fit the spiral scroll wrap of the fixed scroll, and a tip seal and the tip seal groove are provided in the tip seal groove. An elastic body for urging the tip seal against the other scroll head surface is fitted between the bottom and the tip seal, and the orbiting scroll is connected to a motor by a crankshaft, and the motor operates. In the scroll type fluid machine in which the orbiting scroll revolves without rotating, and sequentially compresses or expands a plurality of fluid pockets formed between the orbiting scroll and the fixed scroll, the elastic body is made of a polymer. A plate formed of a material and extending in the longitudinal direction of the chip seal groove; Constituted by upper protrusion and a lower protrusion provided on the fin-shaped upper and lower plate, upper protrusion and lower protrusion are scroll type fluid machine, characterized in that to overlap with a portion in the plane position of the plate. 2. The elastic body includes a plate having a width substantially equal to the width of the chip seal groove and extending in the longitudinal direction of the chip seal groove, and upper and lower protrusions provided in a fin shape above and below the plate. 2. The scroll-type fluid machine according to claim 1, wherein said upper projection and said lower projection have a shape for preventing flow of a fluid in said tip seal groove in a groove width direction and a longitudinal direction, respectively. 3. The scroll type fluid machine according to claim 1, wherein said elastic body is made of a polymer material having chemical resistance such as fluorine or silicon.