JP2017089491A - Scroll Type Fluid Machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scroll type fluid machine capable of improving a space efficiency when a spiral wall body is arranged on an end plate.SOLUTION: A wall body 1 has a shape defined by the following formula, i.e. xb=bcos(φ)+bωsinφ); yb=bsin(φ)+bωcos(φ); xf=bcos(φ)+(bφ-Tr)sin(φ); yf=bsin(φ)-(bφ-Tr)cos(φ), where ω=φ+αsin(nφ), Tr=πb-ρ and where xb, yb are coordinates at xy coordinate system; xf, yf are coordinates at xy coordinate system; b is a radius of base circle; φ is an involute angle; n is n-square parameter [n is a natural number of 2 or more]; α is a coefficient, Tr is a wall surface thickness of the wall body; ρ is a slewing radius.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a scroll type fluid machine.

The shape of the spiral wall used in the conventional scroll type fluid machine is defined using an involute curve or an Archimedes curve (for example, refer to Patent Document 1 for the case of using an involute curve). The outer shape of the scroll member having such a spiral wall is substantially circular.
On the other hand, in Patent Document 2, three spiral wall bodies are formed at equiangular intervals around the center of each end plate of the fixed scroll and the orbiting scroll, and three pairs of spiral wall bodies are formed. A three-cylinder scroll compressor is disclosed.

Japanese Patent No. 3377538 JP 2013-241886 A

  However, since the outer shape of the spiral wall body described in Patent Document 2 is substantially circular, if three spiral wall bodies are similarly arranged on a substantially circular end plate, FIG. It becomes like b). Since the outer shape of each spiral wall body 100 is circular, the region 101 of the end plate 103 where the spiral wall body 100 is not disposed becomes a useless space, resulting in poor space efficiency. This is an unavoidable configuration as long as the outer shape of the spiral wall body 100 is circular. Further, in the case where there are two spiral wall bodies 100 (FIG. 12A) and in the case where there are four spiral walls 100 (FIG. 12C), the space efficiency is similarly deteriorated.

  This invention is made in view of such a situation, Comprising: When arrange | positioning a spiral wall body on an end plate, it is providing the scroll type fluid machine which can improve space efficiency. Objective.

In order to solve the above problems, the scroll fluid machine of the present invention employs the following means.
That is, a scroll type fluid machine according to the present invention includes a scroll member having a spiral wall body standing on one side surface of an end plate, and the wall body is in an xy coordinate system defining a shape of an outer peripheral side. The coordinates are xb, yb, the coordinates in the xy coordinate system that defines the shape on the inner circumference side are xf, yf, b is the basic circle radius, φ is the expansion angle, n is the n-square parameter (n is a natural number of 2 or more) ), And α is a coefficient, Tr is the wall thickness of the wall body, and ρ is the turning radius, and the shape is defined by the following equation.
xb = bcos (φ) + bωsin (φ)
yb = bsin (φ) + bωcos (φ)
xf = bcos (φ) + (bφ−Tr) sin (φ)
yf = bsin (φ) − (bφ−Tr) cos (φ)
here,
ω = φ + αsin (nφ)
Tr = πb−ρ
It is.

When the shape of the spiral wall body is defined by the above formula using the n-gon parameter, the shape approximates a regular n-gon. Since a spiral wall body approximated to a regular n-gon can be formed, the wall body can be installed according to the arrangement space.
The other wall body meshed with the wall body defined by the above equation maps the shape of the wall body obtained by the above equation in a point-symmetric manner with respect to the origin of the xy coordinate system, and the origin is a circle with a turning radius ρ. It can be given in a shape that is translated upward.

  Furthermore, the scroll type fluid machine of the present invention is characterized in that the ω is positive and the α is 1 / n or more.

When ω is positive and α is 1 / n or more, the shape is more approximate to a regular n-gon. Specifically, the larger α is, the closer to a regular n-gon. The shape approximated to a regular n-gon is represented by a regular n-square approximation, and the outer shape area of the spiral wall represented by the above formula, and the circumscribed positive n that circumscribes the outer shape on the inner side. It is defined by the ratio to the square area. Specifically, it is expressed by the following formula, and the closer to 1, the higher the degree of approximation.
{Regular n-gonal approximation} = {outer shape area} / {circumscribed regular n-gonal area}

  Further, in the scroll type fluid machine according to the present invention, the plurality of wall bodies are arranged at predetermined angular intervals around a predetermined point, and the adjacent walls have a larger radius of curvature than the other parts. It is characterized by.

By arranging a plurality of wall bodies around a predetermined point with a predetermined angular interval, a plurality of pairs of scroll compressors are realized in which the wall bodies mesh with each other in pairs. And the part where the curvature radius of an adjacent wall body is larger than another part is arrange | positioned facing each other. That is, since the curvature radius is larger than the other portions and the portions close to a straight line are adjacent to each other, it is possible to reduce the area where the spiral wall body does not exist. Thereby, a scroll member with high space efficiency can be realized, and a compact scroll type fluid machine can be provided.
The predetermined angular interval is preferably a substantially equiangular interval in which the angle error with respect to the equiangular interval is ± 10 °, more preferably ± 1 °.
As the predetermined point, preferably, the center of the end plate on which the wall body is erected is selected.

  When the shape of the spiral wall body is defined by the above formula using the n-gon parameter, the shape approximates a regular n-gon. Thereby, even when there is a space limitation, the space efficiency can be improved by arranging the spiral wall body approximated to a regular n-gon.

It is the top view which showed the 1st wall body which concerns on 1st Embodiment of this invention. It is the top view which showed the 2nd wall body meshed | engaged with the 1st wall body of FIG. It is the top view which showed the state which mesh | engaged the 1st wall body of FIG. 1, and the 2nd wall body of FIG. It is the top view which showed the case where n square parameter was set to 2. It is the top view which showed the case where n square parameter was set to 3. It is the top view which showed the case where n square parameter was set to 5. It is the top view which showed the case where n square parameter was set to 6. It is the top view which showed the 1st wall body and 2nd wall body which concern on 2nd Embodiment of this invention. It is the top view which showed the 1st wall body which enlarged the coefficient (alpha) with respect to FIG. 8, and the 2nd wall body. FIG. 10 is a plan view showing a first wall body and a second wall body having a coefficient α larger than that in FIG. 9. It is a top view which has arranged a plurality of wall bodies at equiangular intervals around a predetermined point. It is a top view showing typically the state where a plurality of wall bodies are arranged to an end plate.

Embodiments according to the present invention will be described below with reference to the drawings.
[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to FIG.
The scroll type compressor (scroll type fluid machine) of the present embodiment compresses or expands gas (fluid) and is not particularly limited. For example, it is used as a compressor of a vapor compression type refrigerator. In some cases, the refrigerant is compressed. A drive source for driving the scroll compressor is not particularly limited, and examples thereof include an electric motor and rotational power extracted from a vehicle engine.

FIG. 1 shows a spiral first wall 1 of the fixed scroll member, and FIG. 2 shows a spiral second wall 2 of the orbiting scroll member. In the present embodiment, the second wall 2 of the orbiting scroll is hatched to facilitate the distinction between the first wall 1 of the fixed scroll and the second wall 2 of the orbiting scroll.
Each of the walls 1 and 2 is made of an aluminum alloy or iron-based metal together with the end plate. Although the outline of the end plate is not drawn in the drawing, it is generally a disk shape formed larger than the diameter surrounding the entire wall. 1 and 2 show only the shapes 1a and 2a on the inner peripheral side and the shapes 1b and 2b on the outer peripheral side of the walls 1 and 2, and the winding start portion and the outer periphery on the central side of the spiral shape are shown. The shape of the winding end on the side is omitted. The shape of the winding start portion and the winding end portion is arbitrarily determined depending on the shape and strength of the discharge port. In the present embodiment, the shape of a portion mainly contributing to compression between the winding start portion and the winding end portion will be described.

The first wall 1 of the fixed scroll member shown in FIG. 1 has a spiral shape erected on one side surface of the end plate of the fixed scroll member, and is defined by the following equation.
That is, the first wall body 1 has xb and yb as coordinates in the xy coordinate system that defines the outer shape 1b, xf and yf as coordinates in the xy coordinate system that defines the inner shape 1a, and b The basic circle radius of the involute curve, φ is the expansion angle of the involute curve, n is an n-square parameter (n is a natural number of 2 or more), α is a coefficient, Tr is the wall thickness of the first wall 1, and ρ is orbiting scroll When the turning radius of the member is used, the shape is defined by the following formula.
xb = bcos (φ) + bωsin (φ) (1)
yb = bsin (φ) + bωcos (φ) (2)
xf = bcos (φ) + (bφ−Tr) sin (φ) (3)
yf = bsin (φ) − (bφ−Tr) cos (φ) (4)
here,
ω = φ + αsin (nφ) (5)
Tr = πb−ρ (6)
It is.

  In FIG. 1, the n-square parameter is 4, and the coefficient α is 1 / n (= 1/4). Since the n-square parameter is 4, the shape approximates a regular square. That is, there is a portion 1c having a relatively small radius of curvature and a portion 1d having a relatively large radius of curvature and a linear shape, which are not substantially circular as in a general scroll compressor, and the radius of curvature is relatively small. The small portion 1c corresponds to the corner of the regular square, and the portion 1d having a relatively large radius of curvature corresponds to the side of the regular square.

  As shown in FIG. 1, when the coefficient α is 1 / n or less, ω is always an increasing function with respect to the expansion angle φ, so that the shape of the wall body is established when the expansion angle φ> 0. .

  FIG. 2 shows a second wall 2 of the orbiting scroll member that meshes with the first wall 1 of FIG. The second wall 2 is given in a shape in which the shape of the first wall 1 is point-symmetrically mapped with respect to the origin of the xy coordinate system in FIG. 1, and the origin is translated on a circle having a turning radius ρ.

  FIG. 3 shows a state in which the first wall body 1 and the second wall body 2 described above are engaged with each other. When these wall bodies 1 and 2 relatively revolve, the compression space formed between the wall bodies 1 and 2 moves to the center and gradually shrinks to compress the gas inside. The compressed gas is discharged from a central discharge port (not shown) to the outside.

FIG. 4 shows a shape in which the n-square parameter is 2 and the coefficient α is 1 / n (= 1/2). When n = 2, the shape is close to an ellipse or an oval.
FIG. 5 shows a shape in which the n-square parameter is 3 and the coefficient α is 1 / n (1 = 3). When n = 3, the shape is close to an equilateral triangle.
FIG. 6 shows a shape in which the n-square parameter is 5 and the coefficient α is 1 / n (1 = 5). When n = 5, the shape is close to a regular pentagon.
FIG. 7 shows a shape in which the n-square parameter is 5 and the coefficient α is 1 / n (1 = 6). When n = 6, the shape is close to a regular hexagon.

As described above, according to the present embodiment, the following operational effects are obtained.
When the spiral wall shape is defined by the above formulas (1) to (6) using the n-gon parameter, the shape approximates a regular n-gon. Thereby, since the spiral wall body approximated to the regular n-gon can be formed, the wall body can be installed according to the arrangement space.

[Second Embodiment]
Next, a second embodiment of the present invention will be described.
The present embodiment is the same as the first embodiment in that the shapes of the spiral wall bodies 1 and 2 are defined by the equations (1) to (6) using the n-square parameter. Therefore, the components common to the first embodiment are denoted by the same reference numerals and the description thereof is omitted.

  In this embodiment, the degree of approximation of a shape approximated to a regular n-gon is increased. Specifically, in the above formulas (1) to (6), ω is positive and the coefficient α is 1 / n or more. The larger the coefficient α, the more the shape approximates a regular n-gon. When ω is negative, the above formulas (1) to (6) do not hold the shape. However, even if the coefficient α is larger than 1 / n, the shape is established in the region where ω is positive. The region where ω is positive is when φ / α> 1 (α> 0, φ> 0).

The shape approximated to the regular n-gon is represented by the degree of regular n-square approximation, and the outer shape area of the spiral wall bodies 1 and 2 represented by the above formulas (1) to (6) and the outer shape It is defined by the ratio to the area of a circumscribed regular n-gon that is located inside and circumscribed. Specifically, it is expressed by the following formula (7), and the closer to 1, the higher the degree of approximation.
{Regular n-square approximation} = {Outer shape area} / {Outer regular n-gon area} (7)

  8 to 10 show a case where the coefficient α is increased with n = 3. 8, the coefficient α is 0.3333 (similar to FIG. 5), the coefficient α is 0.7 in FIG. 9, and the coefficient α is 1.2 in FIG. As can be seen by comparing FIG. 8 to FIG. 10, the degree of equilateral triangle approximation increases as the coefficient α increases.

  FIG. 11 shows a state in which the wall bodies 1 and 2 shown in FIG. 10 are arranged with a pair of six wall bodies 1 and 2 around the predetermined point O at equiangular intervals. The adjacent walls 1 and 2 are disposed so that the portions having a radius of curvature larger than the other portions are opposed to each other. As the predetermined point O, preferably, the center of the end plate on which the walls 1 and 2 are erected is selected.

  As described above, by arranging the plurality of wall bodies 1 and 2 around the predetermined point O at equal angular intervals, a plurality of pairs of scroll compressors are realized in which the wall bodies 1 and 2 mesh with each other in pairs. . And the parts where the curvature radius of the adjacent wall bodies 1 and 2 is larger than another part are arrange | positioned facing each other. That is, since the curvature radius is larger than the other portions and the portions close to a straight line are adjacent to each other, it is possible to reduce the area where the spiral wall body does not exist. Thereby, a scroll member with high space efficiency can be realized, and a compact scroll type fluid machine can be provided.

  In each of the above-described embodiments, the first wall body 1 is described as the fixed scroll member side, and the second wall body 2 is described as the orbiting scroll side, but this may be reversed. The present invention can also be applied to a double-rotating scroll type fluid machine in which both scroll members rotate in synchronization.

1 First wall (wall)
1a Inner peripheral side shape 1b Outer peripheral side shape 2 Second wall (wall)
2a Inner circumference side shape 2b Outer circumference side shape

Claims (3)

A scroll member having a spiral wall provided upright on one side of the end plate;
The wall body has xb and yb coordinates in the xy coordinate system defining the outer peripheral shape, xf and yf coordinates in the xy coordinate system defining the inner peripheral shape, b is the basic circle radius, and φ is The shape is defined by the following equation when the expansion angle, n is an n-square parameter (n is a natural number of 2 or more), α is a coefficient, Tr is the wall thickness of the wall body, and ρ is a turning radius. A scroll type fluid machine characterized by the above.
xb = bcos (φ) + bωsin (φ)
yb = bsin (φ) + bωcos (φ)
xf = bcos (φ) + (bφ−Tr) sin (φ)
yf = bsin (φ) − (bφ−Tr) cos (φ)
here,
ω = φ + αsin (nφ)
Tr = πb−ρ
It is.   The scroll type fluid machine according to claim 1, wherein the ω is positive and the α is 1 / n or more.   The plurality of wall bodies are arranged around a predetermined point with a predetermined angular interval, and adjacent wall bodies are arranged such that portions having a radius of curvature larger than other portions are opposed to each other. The scroll type fluid machine according to 2.

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