JPH08338383A - Fluid machine - Google Patents

Abstract

PURPOSE: To improve the sealing property of a closed space, and the processing performance, as well as to expand the compression volume without making the whole body of the device in a large size. CONSTITUTION: The first spiral 13 having an outer engaging surface 23 with a step form cross section rising in a spiral form from the outer periphery to the center; and the second spiral 15 having a spiral form inner engaging surface formed in a step form cross section, as well as carrying out a spiral movement relatively with the first spiral 13; are provided. The outer engaging surface 23 of the first spiral 13, and the inner engaging surface 17 of the second spiral 15 are engaged each other, and a compression mechanism 5 to form a compression chamber accompanying the reduction of the volume from the outer periphery to the center is provided. And between the step surface of the outer engaging surface 23 at the first spiral 13 side, and the step surface of the inner engaging surface 17 at the second spiral 15 side, a spiral form of closed space 33 is formed, and the closed space 33 is reduced by a seal member 35, or the area at the gas invasion side is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid machine suitable as a compressor or a pump.

[0002]

2. Description of the Related Art Conventionally, a scroll compressor is a typical example of a compressor closest to the present invention.

The outline of the scroll compressor is that the scroll on the fixed scroll side and the scroll on the orbiting scroll side are engaged with each other to cause the orbiting scroll to orbit, thereby performing compression with the volume gradually decreasing from the outer circumference to the center. The chamber is formed, and the compressed working fluid is discharged from the discharge port provided on the center side.

[0004]

Since the scroll compressor compresses radially from the outside toward the center, the compression volume is determined by the radius of the orbiting scroll. Therefore, the larger the compression volume, the larger the radius. As a result, the entire device becomes larger. In addition, since the inside and outside of each spiral body are the inner meshing surface and the outer meshing surface that are in contact with each other, it is necessary to accurately machine the inner meshing surface and the outer meshing surface of each spiral body. It was not desirable in terms of sex.

Therefore, an object of the present invention is to provide a fluid machine which is capable of expanding the compression volume without increasing the size thereof, suppressing the seal leakage to a small extent, and very preferable in terms of workability.

[0006]

In order to achieve the above object, firstly, there is provided a first spiral having an outer meshing surface having a stepwise cross-section which rises spirally from the outer periphery toward the center, and The first spiral includes a second spiral having a spiral inner meshing surface formed in a stepwise cross-section relative to the first spiral, and an outer meshing surface of the first spiral and a second spiral. A compression mechanism portion that meshes with the inner meshing surface and forms a compression chamber with a decrease in volume from the outer periphery toward the center is provided.
A spiral closed continuous space between the outer meshing surface of the spiral side and the inner meshing surface of the second spiral, and a seal member is provided in the closed space. Is thicker than the height change range of the spiral caused by the swirling motion in which each spiral relatively swivels.

Secondly, a closed space which is spirally continuous is formed between the step surface of the outer meshing surface on the first spiral side and the step surface of the inner meshing surface on the second spiral side,
A seal member is provided in the closed space, and the seal member is integrally provided with a sub-seal portion that reduces an invasion area where gas enters the closed space.

Thirdly, a closed space which is spirally continuous is formed between the step surface of the outer meshing surface on the first spiral side and the step surface of the inner meshing surface on the second spiral side,
A seal member that divides the closed space into small parts is provided in the closed space.

Fourthly, a closed space which is spirally continuous is formed between the step surface of the outer meshing surface on the first spiral side and the step surface of the inner meshing surface on the second spiral side,
A seal holding groove is provided on the step surface side of the meshing surface that is the fixed side that forms the closed space, and a seal member that divides the closed space into small parts is provided in the seal holding groove. The upper surface and the groove surface of the seal holding groove facing each other have the same contact surface shape capable of contacting each other.

The upper surface of the seal of the seal member has the same shape as the cutting surface for cutting the groove surface of the seal holding groove.

[0011]

According to such a fluid machine, the first spiral and the second spiral relatively rotate while the inner meshing surface and the outer meshing surface mesh with each other, thereby reducing the volume toward the central portion. An accompanying compression chamber is formed.
As a result, the working gas taken in from the outside by the compression chamber is compressed and discharged while rising toward the central portion.

In this case, since the compression volume of the compression chamber is determined by the radial direction and the height direction, a large compression volume can be obtained without increasing the size of the entire apparatus. On the other hand, since the closed space between the compression chambers is partitioned into small parts by the seal member, even if a seal leak occurs, it can be minimized.
Efficient compression is obtained.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be specifically described below with reference to the drawings of FIGS.

In FIG. 4, reference numeral 1 denotes a hermetic case, and in the hermetic case 1, the drive motor 3 and the compression mechanism 5 are provided.
Is arranged.

The drive motor 3 has a rotor 9 fixed to the main shaft 7 and a stator 11 fixedly supported on the inner wall surface of the hermetically sealed case 1, and a current flows through the stator 11,
Rotational power is applied to the main shaft 7 via the rotor 9.

The compression mechanism section 5 comprises a fixed spiral 13 which serves as a second spiral and a revolving spiral 15 which serves as a first spiral, and a main shaft 29 which is continuous integrally with the main shaft 7 penetrates therethrough.

As shown in FIG. 6, in the fixed spiral 13, a spiral staircase-shaped spiral chamber 19 in which the radius of the spiral inner meshing surface 17 gradually decreases from the outer circumference to the center is formed. It is fixedly supported on the inner wall surface of the closed case 1.

The orbiting spiral 15 has, on the outside, a spiral body 21 which rises in a spiral stepwise shape from the outer circumference toward the central portion and whose radius gradually decreases toward the central portion, and the outer circumference of the spiral body 21 has an outer meshing surface 23. Has become.

The outer meshing surface 23 of the spiral body 21 meshes with the inner meshing surface 17 on the fixed spiral 13 side to form a compression chamber 25. Therefore,
As for the processing accuracy, the outer meshing surface 23 and the inner meshing surface 17
Only need to manage.

The compression chamber 25 is directly connected to a suction pipe 27a extended to the outside of the hermetically sealed case 1, and the suction port 2 is in communication therewith.
7, a discharge port 29 provided at the upper part of the closed case 1, and a discharge port 3 communicating with the internal space of the closed case 1
As shown in FIG. 8, the working gas from the suction port 27 is discharged toward the center from the discharge port 31 while being reduced in volume by communicating with 1 and the turning motion of the swirling spiral 15. It has become.

In this case, it is desirable to provide a check valve (not shown) at the suction port 27 or the discharge port 31. This makes it possible to prevent the reverse flow of gas when the rotation is stopped.

The discharge port 31 approaches the end edge 9a of the rotor 9, and the rotation of the rotor 9 causes the discharge port 3 to move.
It is possible to separate the oil in the discharge gas discharged from No. 1.

In addition to the radial direction of the spiral, the compression volume of the compression chamber 25 is determined by the stepped pitch H of the cross section, and the sealing member 35 disposed in the closed space 33 as shown in FIGS. 2 and 3. The seal is secured.

The closed space 33 is horizontal to the vertical portion 41 formed by spirally connecting the stepped surface 37 of the inner meshing surface 17 of the fixed spiral 13 and the stepped surface 39 of the outer meshing surface 23 of the orbiting spiral 15. It has an L-shaped cross section including the portion 43.

The seal member 35 is a sub seal portion 35a which faces the vertical portion 41 which forms the closed space 33 as shown in FIG. 3 (explanation explanatory view in which the stair surface 39 and the seal member 35 are separated).
And the seal portion main body 35b facing the horizontal portion 43 are formed into a spiral with an L-shaped cross section. The thickness t of the seal portion main body 35b and the thickness t1 of the sub-seal portion 35a are high and low generated by the swing movement of the swirling spiral 15. It is larger than the change width h1.

That is, from the point that each of the staircase surfaces 37, 39 is an inclined surface that rises upward, when looking at the point A where the seal member 35 is present during the turning motion of the turning spiral 15,
The point A is in contact with the point B of the sloping stair surface 39, and these contact points also move along with the turning movement of the turning spiral 15 and move from the point A. Observing this movement, another point B1 of the staircase surface 39 comes into contact with the point A, and the group of points B1 in contact with the point A is a closed curve obtained by projecting a circle having a turning diameter φd onto the slope of the staircase surface 39. Become. Since the point A is in contact with the sloped closed curve, the point A moves in the height dimension axial direction equivalent to the height difference h1 in the axial direction of the closed curve.

Therefore, by making the thickness t of the seal member 35 larger than the height difference h1, the side surface 45 of the seal portion main body 35b of the seal member 35 has the side wall 47 of the fixed spiral 13 and the lap region α of a predetermined width. Slide up and down. At this time, since the width of sliding contact and movement is h1, the side surface 45 of the seal member 35 set to be thicker than h1 secures a reliable sealed state against the side wall 47 of the fixed spiral 13 by the lap region. Like

The side surface 49 of the sub seal portion 35a is also
Similar to the seal portion main body 35b, it has a lap region with the side wall 51 of the vertical portion 41 and is in sliding contact in the vertical direction, so that a reliable sealed state is obtained.

The relationship between the seal member 35 and the closed space 33 is as follows.
As shown in FIG. 1, for example, when the turning motion is instantaneously stopped, the left side of the drawing is 90 ° with respect to the axis Y of the spindle 29, the right side is 180 °, the back side is 0 ° with respect to the axis Y, and the front side is 360 °.
Assuming that the closed space 33 is 0 °, the closed space 33 is in a close contact state in which the closed space 33 is zero as indicated by a chain line. Also, 360
The closed space 33 is in the maximum state at the position of ° as shown by the chain line.

As the material of the seal member 35, the refrigerant is R
32, R134 series, R125, R143 series, R152
For liquid, hydrocarbon, and ammonia refrigerants, liquid crystal polymers and polyethersulfone (PE
S), engineered plastics such as polyether ether ketone (PEEK), or Teflon-based resin is preferably contained as a main component. Further, by mixing any of carbon fiber, glass fiber, and molybdenum disulfide (MoS ₂ ) with the main component, abrasion resistance and lubricity can be improved while maintaining strength.

The material of the seal member 35 is
It is also possible to embed a material having a shape memory property such that the height dimension becomes low at a high temperature. As a result, the swirl spiral 15 can be easily assembled by adjusting it to the height of the step surface 39. In addition, since the temperature rises during operation, the height decreases and the spiral spiral 1
Adhesion with 5 is improved, and the sealing property can be improved.

On the other hand, the main shaft 2 passing through the compression mechanism 5
Reference numeral 9 has a shape that is continuous with the main shaft 7 of the drive motor 3 and is rotatable by the main bearing 53 of the fixed spiral 13 and the auxiliary bearing 57 of the support frame 55 that is fixed and supported on the inner wall surface of the closed case 1. Both ends are supported by.

The main shaft 29 is provided with an eccentric shaft portion 59 which is eccentric with respect to the central axis Y by a predetermined amount. Eccentric shaft part 5
The bearing portion 61 of the orbiting spiral 15 is rotatably fitted in the bearing 9, and the bearing portion 61 of the orbiting spiral 15 and the main bearing 53 and the sub bearing 57 are provided at the lower end of the main shaft 29. By 63, the lubricating oil is fed through the lubricating passage 65.

A rotation preventing mechanism 67 such as an Oldham ring and a thrust ring 69 are provided on the back side of the turning spiral 15 and between the support frame 55.

The rotation preventing mechanism 67 functions to suppress rotation of the turning spiral 15 when the eccentric shaft portion 59 rotates.
The swirling motion is given to the swirling spiral 15.

The thrust ring 69 is a means for partitioning the discharge gas inside and the suction gas outside through the gas passage 71, respectively.
It functions to balance the thrust force acting on 5 to the optimum value.

According to the fluid machine configured as described above,
The working gas taken in through the suction port 27 is compressed by the compression chamber 25 which gradually increases in volume from the outer periphery toward the center due to the swirling motion of the swirling spiral 15, and is discharged from the discharge port 31 into the sealed case 1. After being discharged to the outside, it is sent out from the discharge pipe 29.

During this operation, the turning spiral 15
Since the outer meshing surface 23 and the inner meshing surface 17 of the fixed spiral 13 mesh with each other, the accuracy of the meshing surface can be controlled by only two surfaces, and the compression volume of the compression chamber 25 is determined by the radial direction and the height direction. Therefore, a large compression volume can be obtained without increasing the size of the entire apparatus.

On the other hand, the closed space 33 which causes the seal leakage.
Is divided into two, and the inner side that leads to gas leakage on the high pressure side is only a small gap 41a formed in the upper portion of the vertical portion 41 as shown in FIG. 7, so gas leakage is minimized. It is possible to obtain efficient compression.

FIG. 9 shows another embodiment in which the closed space 33 is divided into a plurality of parts along the radial direction of the spiral.

In this embodiment, the seal holding groove 73 is provided in the central portion of the stepped surface 37 on the fixed spiral 13 side, while the seal holding groove 73 is provided in the central portion of the seal portion main body 35b of the seal member 35. Sub seal part 35 facing
a is integrally provided, the closed space 33 is divided into a plurality of parts, and the inner closed space 33 leading to seal leakage is made small.

According to this embodiment, in addition to the effect that the inner closed space 33 leading to gas leakage can be made small, the width D of the sub seal portion 35 can be made large, so the sub seal portion 3
5a functions as a reinforcing member, and the strength of the seal member 35 as a whole can be improved. Further, the staircase surface 39 of the orbiting spiral 15 has the seal portion main body 3 of the seal member 35.
In consideration of wear, it is sufficient to consider only the compatibility between the material of the orbiting spiral 15 and the seal member 35, so that there is an advantage that the range of material selection is expanded and the degree of freedom in design is expanded.

FIG. 10 shows an inner closed space 3 which leads to gas leakage.
3 shows an example in which 3 is reduced.

In this embodiment, a seal holding groove 75 having a predetermined width is provided on the stepped surface 37 forming the closed space 33 on the fixed spiral 13 side, and the seal member 35 is exposed in the seal holding groove 75. The shape is such that the closed space 33 on the left side in the drawing, which leads to seal leakage, is made smaller. Further, the seal upper surface 35c of the seal member 35 and the groove surface 75a of the seal holding groove 75 have substantially the same horizontal surface shape that allows contact.

According to this embodiment, the swirling spiral 15
The seal member 35 moves up and down in response to the swirling motion of the above and the small closed space 33 minimizes the seal leakage, so that efficient compression can be obtained. In addition, the seal member 3
Since the cross-sectional shape of 5 is a simple rectangular shape, processing becomes easy, and a merit in terms of cost is obtained.

As shown in FIG. 11, the seal upper surface 35c of the seal member 35 has the same contact surface as the arc-shaped cutting surface formed when the groove surface 75a of the seal holding groove 75 is cut by an end mill. It may have a shape.

Further, as shown in FIG. 12, the seal holding groove 7
A biasing spring 77 is provided between the groove surface 75a of No. 5 and the seal upper surface 35c of the seal member 35 to increase the contact surface pressure between the staircase surface 37 of the orbiting spiral 15 and the seal member 35b to improve the sealing performance. You may

Alternatively, as shown in FIGS. 13A and 13B, when the seal member 35 is removed, the height of the seal member 35 is previously set to be smaller than the height dimension E of the step portion of the swirling spiral 15. If the thickness E1 is machined, the seal member 35 can be brought into close contact with the step surface 37 of the swirling spiral 15 at the time of assembly, so that the sealability can be improved.

FIG. 14 shows an embodiment in which the gas penetration area into the closed space 33 is made small to prevent the gas penetration into the closed space 33.

That is, the inclined surface 77 extending upward is provided inside the stepped surface 37 of the fixed spiral 3, while the sub-seal portion 35a is raised from the seal portion main body 35b of the sealing member 35 along the inclined surface 77. By expanding the seal area on the high-pressure side, which is the seal leak side, by the sub-seal portion 35a, a gas intrusion region 79 connected to the closed space 33 is formed.
Has a smaller shape.

Therefore, according to this embodiment, since the gas intrusion region 79 is suppressed to a small size, gas intrusion is prevented, and an efficient compressed state can be obtained.

FIGS. 15 to 17 show a modification of FIG. 14 for preventing gas invasion. In the embodiment shown in FIG. 15, the inside of the staircase surface 37 of the fixed spiral 13 is formed into a raised shape 81, while the sub-seal portion 35a is integrally formed along the rounded shape 81 from the seal portion main body 35b of the seal member 35. It has a shape to stand up. As a result, the sealing area of the sub-seal portion 35a is increased, and the small gas intrusion region 79 is used to suppress gas intrusion.

In the embodiment shown in FIG. 16, a vertical portion 83 is formed inside the staircase surface 37 of the fixed spiral 13, and the ceiling surface of the vertical portion 83 is formed as an inclined surface 85, while the sealing member is formed. A sub-seal portion 35a fitted to the vertical portion 83 is raised from the seal portion main body 35b of 35, and the upper surface of the sub-seal portion 35a has a shape of an inclined surface 87 facing the inclined surface 85 of the vertical portion 83. Is.

As a result, the sealing area by the sub-seal portion 35a is enlarged, and the small gas intrusion area 79 is used to suppress gas intrusion.

In the embodiment of FIG. 17, a stepwise vertical portion 89 is formed inside the step surface 37 of the fixed spiral 13, while the seal portion main body 35b of the seal member 35
A plurality of step-like sub-seal portions 35a corresponding to the step-like vertical portions 89 are formed in a raised shape.

As a result, the seal area of the sub-seal portion 35a is increased, and the small gas intrusion area 79 is used to suppress gas intrusion.

In this embodiment, the fluid mechanism has been described as a compressor, but it may be implemented as a pump.

[0058]

As described above, according to the fluid mechanism of the present invention, the gas leakage into the closed space can be suppressed to a small level by the seal member, so that efficient compression can be obtained. Further, since the compression volume can be determined along the radial direction and the height direction, a large compression volume can be obtained without increasing the size of the entire device, and the meshing surface is
Since the outer meshing surface of the spiral and the inner meshing surface of the second spiral suffice, the machining is easy and it is very preferable in terms of workability.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of a compression mechanism section according to the present invention.

FIG. 2 is a sectional view showing a part of a closed space.

FIG. 3 is an explanatory view showing a relationship among a seal member, a closed space, and a staircase surface on the side of a turning spiral.

FIG. 4 is a schematic sectional view of the entire fluid machine.

FIG. 5 is a plan view of a turning spiral.

FIG. 6 is an explanatory view showing a meshed state of a fixed spiral and a turning spiral.

FIG. 7 is an enlarged view of part X in FIG.

FIG. 8 is an operation explanatory view showing a compression process.

9 is an enlarged view similar to FIG. 7 showing a modified example of the sub seal portion.

FIG. 10 is an enlarged view similar to FIG. 7 in which a seal member is faced in a seal holding groove provided on a stepped surface on the fixed spiral side.

11 is an enlarged view similar to FIG. 10 in which the upper surface of the seal of the seal member has the same shape as an arcuate cutting surface formed when cutting the groove surface of the seal holding groove.

FIG. 12 is an enlarged view similar to FIG. 10 in which a biasing spring is provided in the seal holding groove.

FIG. 13 is an explanatory diagram in which the height dimension of the seal member is made smaller than the height dimension of the step portion of the orbiting spiral to improve the assembling property.

FIG. 14 is an enlarged explanatory view similar to FIG. 7, in which the seal area is enlarged by the sub-seal portion of the seal member, and the gas intrusion region is reduced.

FIG. 15 is a view showing a second modified example of the sub seal portion.
FIG.

FIG. 16 is a view showing a third modified example of the sub seal portion.
FIG.

FIG. 17 is a view showing a fourth modified example of the sub seal portion.
FIG.

[Explanation of symbols]

 5 Compression Mechanism Section 13 First Spiral (Swirl Spiral) 15 Second Spiral (Fixed Spiral) 17 Inner Interlocking Surface 23 Outer Interlocking Surface 25 Compression Chamber 33 Closed Space 35 Sealing Member 37 Staircase Surface 39 Staircase Surface

Claims (5)

[Claims] 1. A first spiral having an outer meshing surface having a stepwise cross-section that rises spirally from the outer periphery toward the center, and is spirally moved relative to the first spiral and is formed in a stepwise cross-section. And a second spiral having a spiral inner meshing surface that meshes with the outer meshing surface of the first spiral and the inner meshing surface of the second spiral to reduce the volume from the outer circumference toward the center. A compression mechanism portion that forms a compression chamber to accompany the first compression mechanism is provided.
A spiral closed continuous space between the outer meshing surface on the spiral side and the second meshing surface on the inner spiral side, and a sealing member is provided in the closed space to seal the space. A fluid machine characterized in that a member is made thicker than a height change range of a spiral generated by a swirling motion in which each spiral relatively swirls. 2. A first spiral having an outer meshing surface having a stepwise cross-section that rises spirally from the outer circumference toward the center, and spirally moves relative to the first spiral and is formed in a stepwise cross-section. And a second spiral having a spiral inner meshing surface that meshes with the outer meshing surface of the first spiral and the inner meshing surface of the second spiral to reduce the volume from the outer circumference toward the center. A compression mechanism portion that forms a compression chamber to accompany the first compression mechanism is provided.
A spiral closed space is formed between the stepped surface of the outer meshing surface on the spiral side and the stepped surface of the inner meshing surface on the second spiral side, and a seal member is provided in the closed space. A fluid machine characterized in that a sub-seal portion is integrally provided to reduce an invasion area into which the gas enters the closed space. 3. A first spiral having an outer meshing surface having a stepped cross-section that rises spirally from the outer periphery toward the center, and spirally moves relative to the first spiral and is formed in a stepped cross-section. And a second spiral having a spiral inner meshing surface that meshes with the outer meshing surface of the first spiral and the inner meshing surface of the second spiral to reduce the volume from the outer circumference toward the center. A compression mechanism portion for forming an accompanying compression chamber is provided, and the first
A spiral closed space is formed between the stepped surface of the outer meshing surface on the spiral side and the stepped surface of the inner meshing surface on the second spiral side, and a seal member for partitioning the closed space is provided. Characteristic fluid machinery. 4. A first spiral having an outer meshing surface having a stepwise cross-section that rises spirally from the outer periphery toward the center, and is formed in a stepwise cross-section while spiraling relative to the first spiral. And a second spiral having a spiral inner meshing surface that meshes with the outer meshing surface of the first spiral and the inner meshing surface of the second spiral to reduce the volume from the outer circumference toward the center. A compression mechanism portion that forms a compression chamber to accompany the first compression mechanism is provided.
A spirally continuous closed space is formed between the step surface of the outer meshing surface on the spiral side and the step surface of the inner meshing surface on the second spiral side, and the meshing surface on the fixed side that forms the closed space. A seal holding groove is provided on the side of the staircase surface, and a seal member for partitioning the closed space into a small space is provided in the seal holding groove, and a seal upper surface of the seal member and a groove surface of the seal holding groove facing the seal upper surface. A fluid machine having the same contact surface shape capable of contacting with. 5. The fluid machine according to claim 4, wherein the seal upper surface of the seal member has the same shape as a cutting surface at the time of cutting the groove surface of the seal holding groove.