JP6382265B2 - Scroll fluid machinery - Google Patents

Description

  The present invention relates to a scroll fluid machine.

  In general, a scroll fluid machine is known in which a fixed scroll member provided with a spiral wall on an end plate and a orbiting scroll member are engaged with each other, and a revolving orbiting motion is performed to compress or expand a fluid.

  As such a scroll fluid machine, a so-called stepped scroll compressor as shown in Patent Document 1 is known. This stepped scroll compressor is provided with stepped portions at positions along the spiral direction of the tooth tip surface and the tooth bottom surface of the spiral wall body of the fixed scroll and the orbiting scroll, and the outer periphery of the wall body with each step portion as a boundary. The height on the side is higher than the height on the inner peripheral side. The stepped scroll compressor is compressed not only in the circumferential direction of the wall but also in the height direction (three-dimensional compression), so compared to a general scroll compressor (two-dimensional compression) that does not have a stepped portion. The displacement can be increased and the compressor capacity can be increased.

JP2015-55173A

  However, the stepped scroll compressor has a problem that fluid leakage at the stepped portion is large. In addition, there is a problem that the stress is concentrated due to the stress concentrated at the base of the stepped portion.

On the other hand, the inventors are considering providing a continuous inclined part instead of the step part provided in the wall body and the end plate.
However, even if the inclined portion is provided, it is desired to reduce fluid leakage due to the tip clearance between the tooth tip of the wall body and the tooth bottom of the end plate.

  The present invention has been made in view of such circumstances, and the wall body and the end plate that are capable of reducing the tip clearance between the tooth tip of the wall body and the bottom of the end plate are inclined portions. It is an object to provide a scroll fluid machine having the following.

  In order to solve the above problems, the scroll fluid machine of the present invention employs the following means.

That is, the scroll fluid machine according to the present invention includes a first scroll member in which a spiral first wall body is provided on a first end plate, and a second end plate disposed so as to face the first end plate. A spiral second wall body is provided on the first wall body, and the second wall body is provided with a second scroll member that engages with the first wall body by being offset by a turning radius and relatively revolves. It is a scroll fluid machine, Comprising: The distance between the opposing surfaces of the said 1st end plate and the said 2nd end plate which face each other is continuous toward the inner peripheral side from the outer peripheral side of the said 1st wall body and the said 2nd wall body. A slope portion that decreases in number is provided, and at least one of the first wall body and the second wall body is provided with a wall body flat portion that does not change in height at the outermost peripheral portion and the innermost peripheral portion. In at least one of the first end plate and the second end plate, Kikabetai flats end plate flat portion is provided corresponding to said at least one of the first wall and the second wall, wherein the innermost portion of the wall flat portion of the outermost peripheral portion A wall inclined portion in which the height of the wall continuously decreases from the outer peripheral side toward the inner peripheral side so as to form the inclined portion between the wall flat portion and the wall flat portion, At least one of the first end plate and the second end plate extends from the end plate flat portion of the outermost peripheral portion to the end plate flat portion of the innermost peripheral portion. The tooth base facing the tip has an end plate inclined portion that is inclined according to the inclination of the wall inclined portion, and the length of the wall inclined portion in the spiral direction is the wall flat portion of the outermost peripheral portion. Longer than the length in the spiral direction, and longer than the length in the spiral direction of the wall flat portion of the innermost periphery, The length of the end plate inclined portion in the spiral direction is longer than the length of the end plate flat portion of the outermost peripheral portion in the spiral direction, and the length of the end plate flat portion of the innermost peripheral portion in the spiral direction. The contour is formed in the end plate inclined portion in a direction orthogonal to the spiral direction of the wall body, and the inclined portions facing each other between the first scroll member and the second scroll member move away from each other. The phase is shifted in the direction by the turning radius.

Since the inclined portion in which the distance between the opposing surfaces of the first end plate and the second end plate continuously decreases from the outer peripheral side to the inner peripheral side of the wall body is provided, the fluid sucked from the outer peripheral side is As it goes to the inner peripheral side, it is compressed not only by the reduction of the compression chamber according to the spiral shape of the wall body, but also by the reduction of the distance between the opposing surfaces between the end plates.
Contour lines are formed in the end plate inclined portion, that is, the tooth bottom, in a direction perpendicular to the spiral direction of the wall body. In this case, if the first scroll member and the second scroll member are made to coincide at the turning center position in the spiral direction, the tooth bottom and the tooth tip may interfere when both scroll members make a turning motion. There is. Therefore, the first scroll member and the second scroll member are arranged with their phases shifted by the turning radius in the direction in which the inclined portions facing each other move away from each other. Thereby, it can avoid that a tooth base and a tooth tip interfere. Further, when the phase is advanced by the turning radius, the tip portions are meshed so that the positions of the inclined portions coincide with each other, so that the tip clearance between the tooth tip and the tooth bottom can be reduced.

Further, the scroll fluid machine according to the present invention, relative to prior Symbol end plate inclined portion and the end plate end plate inclined connecting portion and the flat portion are connected, and the wall inclined portion and said wall flats is The wall inclined connection portions to be connected are arranged with a phase delayed by the turning radius.

  Contour lines are formed in the end plate inclined portion, that is, the tooth bottom, in a direction perpendicular to the spiral direction of the wall body. In this case, the end plate inclined connecting portion to which the end plate inclined portion and the end plate flat portion are connected and the wall inclined connecting portion to which the wall inclined portion and the wall flat portion are connected are swung in the spiral direction. If they are matched at the center position, there is a possibility that the tooth bottom and the tooth tip interfere with each other when both scroll members perform a turning motion. Therefore, the wall body inclined connection portion is arranged with the phase delayed by the turning radius with respect to the end plate inclined connection portion. Thereby, it can avoid that a tooth base and a tooth tip interfere. In addition, when the phase of the wall inclined connection portion advances by the turning radius with respect to the end plate inclined connection portion, the end plate inclined connection portion and the wall inclined connection portion are meshed so that the positions coincide with each other. The tip clearance between the tip and the root can be reduced.

The scroll fluid machine according to the present invention includes a first scroll member having a spiral first wall provided on a first end plate, and a second end plate disposed to face the first end plate. A spiral second wall body is provided on the first wall body, and the second wall body is provided with a second scroll member that engages with the first wall body by being offset by a turning radius and relatively revolves. It is a scroll fluid machine, Comprising: The distance between the opposing surfaces of the said 1st end plate and the said 2nd end plate which face each other is continuous toward the inner peripheral side from the outer peripheral side of the said 1st wall body and the said 2nd wall body. A slope portion that decreases in number is provided, and at least one of the first wall body and the second wall body is provided with a wall body flat portion that does not change in height at the outermost peripheral portion and the innermost peripheral portion. , At least one of the first end plate and the second end plate includes Body end plate flat portion corresponding to the flat portion is provided, said first wall and at least one of the second wall, the said innermost portion of said wall flats of the outermost peripheral portion A wall slope portion in which the height of the wall body continuously decreases from the outer peripheral side toward the inner circumference side so as to form the slope portion between the wall flat portion and the first end; At least one of the plate and the second end plate extends from the end plate flat portion of the outermost peripheral portion to the end plate flat portion of the innermost peripheral portion at the tooth tip of the wall inclined portion. The opposing tooth bottom surface has an end plate inclined portion that is inclined according to the inclination of the wall inclined portion, and the length of the wall inclined portion in the spiral direction is a spiral of the wall flat portion of the outermost peripheral portion. Longer than the length in the direction, and longer than the length in the spiral direction of the wall body flat portion of the innermost peripheral portion, The length of the plate inclined portion in the spiral direction is longer than the length of the end plate flat portion of the outermost peripheral portion in the spiral direction, and is longer than the length of the end plate flat portion of the innermost peripheral portion in the spiral direction. The end plate inclined portion is formed with one or a plurality of arcs having contours as intersections with the wall body, and the first scroll member and the second scroll member are moved during the turning motion. It arrange | positions so that it may become a phase which corresponds in the turning center position in a spiral direction.

Since the inclined portion in which the distance between the opposing surfaces of the first end plate and the second end plate continuously decreases from the outer peripheral side to the inner peripheral side of the wall body is provided, the fluid sucked from the outer peripheral side is As it goes to the inner peripheral side, it is compressed not only by the reduction of the compression chamber according to the spiral shape of the wall body, but also by the reduction of the distance between the opposing surfaces between the end plates.
In the end plate inclined portion, one or a plurality of arcs whose contact points are intersections with the wall are formed as contour lines. In this case, the first scroll member and the second scroll member have a phase coincident with each other at the turning center position in the spiral direction during the turning motion, that is, the first scroll member and the second scroll member are If they are arranged so as to have the same phase, the tooth tip and the tooth bottom do not interfere with each other during the turning motion, and the tip clearance between the tooth tip and the tooth bottom can be reduced.
In order to form one or more circular arcs having a contact point at the intersection with the wall as a contour line on the end plate inclined portion, an end mill having a diameter equal to or less than the root width of the end plate inclined portion is used. It is preferable to process.

Further, the scroll fluid machine according to the present invention, the prior SL end plate inclined portion, contacts the intersection of the end plate inclined connecting portion and said end plate inclined portion and the end plate flat portion is connected to the wall 1 or a plurality of arcs are formed as contour lines, and the wall body inclined connection portion, to which the wall body inclined portion and the wall body flat portion are connected, is connected to the end plate inclined connection portion during the turning motion. It arrange | positions so that it may correspond in the turning center position in the spiral direction of this.

In the end plate inclined portion, one or a plurality of arcs having a contact point at the intersection of the end plate inclined connecting portion to which the end plate inclined portion and the end plate flat portion are connected and the wall body are formed as contour lines. In this case, with respect to the end plate inclined connecting portion, the wall body inclined connecting portion is coincident at the turning center position in the spiral direction during the turning motion, that is, the end plate inclined connecting portion and the wall body inclined connecting portion. If they are arranged so as to have the same phase, the tooth tip and the tooth bottom do not interfere with each other during the turning motion, and the tip clearance between the tooth tip and the tooth bottom can be reduced.
To form one or more arcs as contour lines at the intersection of the end plate inclined connecting portion and the wall body on the end plate inclined portion, the diameter is equal to or smaller than the tooth bottom width of the end plate inclined portion. It is preferable to process using an end mill having

Furthermore, according to the scroll fluid machine of the present invention, when the diameter of the circular arc forming the contour line is De, the root width of the end plate inclined portion is Tg, and the turning radius of the turning motion is ρ,
{Tg ² + (2ρ) ² } / (2Tg) ≦ De ≦ Tg
It is said that it is said.

  By satisfying the above relational expression, it is possible to avoid that the tooth tip and the tooth base approach each other and interfere with each other during the turning motion.

Furthermore, according to the scroll fluid machine of the present invention,
De = {Tg ² + (2ρ) ² } / (2Tg)
It is said that it is said.

  By setting De = {Tg2 + (2ρ) 2} / (2Tg), the tip clearance between the contour line and the wall inclined connection portion can be brought close to zero when the tooth tip and the tooth bottom are closest to each other during the turning motion. it can.

  When the contour line is formed in the end plate inclined portion, that is, the tooth bottom, in the direction orthogonal to the spiral direction, the wall inclined connection portion is arranged with a phase delayed by the turning radius with respect to the end plate inclined connection portion. I did it. Thereby, the tooth tip and the tooth bottom do not interfere with each other during the turning motion, and the tip clearance between the tooth tip and the tooth bottom can be reduced.

  When one or more arcs whose contact points are the intersections of the end plate inclined connection portion and the wall body are formed as contour lines on the end plate inclined portion, the wall body inclined connection is made to the end plate inclined connection portion. The parts are arranged so as to coincide with each other at the turning center position in the spiral direction during the turning motion. Thereby, the tooth tip and the tooth bottom do not interfere with each other during the turning motion, and the tip clearance between the tooth tip and the tooth bottom can be reduced.

The fixed scroll and the turning scroll of the scroll compressor concerning one Embodiment of this invention are shown, (a) is a longitudinal cross-sectional view, (b) is the top view seen from the wall body side of the fixed scroll. It is the perspective view which showed the turning scroll of FIG. It is the top view which showed the end plate flat part provided in the fixed scroll. It is the top view which showed the wall body flat part provided in the fixed scroll. It is a schematic diagram which shows the wall body extended and displayed in the spiral direction. It is the elements on larger scale which expanded and showed the field of the code Z of Drawing 1 (b). 6 shows the tip seal gap in the portion shown in FIG. 6, (a) is a side view showing a state where the tip seal gap is relatively small, and (b) shows a state where the tip seal gap is relatively large. It is a side view. It is the elements on larger scale which showed the end plate inclination connection part periphery. As a comparative example, a positional relationship between a tooth tip and a tooth bottom is shown, (a) is a contact position, (b) is a width center position, and (c) is a side view at a position advanced 180 ° from the width center position. The positional relationship between the tooth tip and the tooth bottom in the first embodiment is shown, (a) is a contact position, (b) is a width center position, and (c) is a side view at a position advanced 180 ° from the width center position. The processing method of the tooth bottom and wall body side surface concerning 2nd Embodiment is shown, (a) is the top view which planarly viewed the tooth bottom, (b) is a side view. It is the elements on larger scale which showed the end plate inclination connection part periphery. As a comparative example, a positional relationship between a tooth tip and a tooth bottom is shown, (a) is a width center position, (b) is a contact position, and (c) is a side view at a position advanced 180 ° from the width center position. The positional relationship between the tooth tip and the tooth bottom in the second embodiment is shown, (a) is a contact position, (b) is a width center position, and (c) is a side view at a position advanced 180 ° from the width center position. It is the elements on larger scale which expanded the chip clearance circumference. It is the top view which showed the processing method of the tooth base and wall surface which concern on 3rd Embodiment. It is the elements on larger scale which showed the end plate inclination connection part periphery. It is the schematic diagram showing the geometrical relationship of the contour line which concerns on 3rd Embodiment.

[First Embodiment]
A first embodiment according to the present invention will be described below with reference to the drawings.
FIG. 1 shows a fixed scroll (first scroll member) 3 and a turning scroll (second scroll member) 5 of a scroll compressor (scroll fluid machine) 1. The scroll compressor 1 is used as a compressor that compresses a gas refrigerant (fluid) that performs a refrigeration cycle such as an air conditioner.

  The fixed scroll 3 and the orbiting scroll 5 are made of a metal compression mechanism made of aluminum alloy or iron, and are housed in a housing (not shown). The fixed scroll 3 and the orbiting scroll 5 suck the fluid guided into the housing from the outer peripheral side, and discharge the compressed fluid from the central discharge port 3c of the fixed scroll 3 to the outside.

  The fixed scroll 3 is fixed to the housing and, as shown in FIG. 1A, stands on a substantially disc-shaped end plate (first end plate) 3a and one side surface of the end plate 3a. And a spiral wall body (first wall body) 3b. The orbiting scroll 5 includes a substantially disc-shaped end plate (second end plate) 5a and a spiral wall body (second wall body) 5b erected on one side surface of the end plate 5a. . The spiral shape of each wall 3b, 5b is defined using, for example, an involute curve or an Archimedean curve.

  The fixed scroll 3 and the orbiting scroll 5 are meshed with their centers separated by an orbiting radius ρ, with the phases of the wall bodies 3b and 5b shifted by 180 °, and between the tooth tips and the tooth bottoms of the wall bodies 3b and 5b of both scrolls. It is assembled so as to have a slight clearance in the height direction (chip clearance). Thus, a plurality of pairs of compression chambers formed between the scrolls 3 and 5 and surrounded by the end plates 3a and 5a and the walls 3b and 5b are formed symmetrically with respect to the scroll center. The orbiting scroll 5 revolves around the fixed scroll 3 by a rotation prevention mechanism such as an Oldham ring (not shown).

  As shown in FIG. 1 (a), the distance L between the facing surfaces 3a and 5a facing each other is continuously decreased from the outer peripheral side to the inner peripheral side of the spiral wall bodies 3b and 5b. Is provided.

  As shown in FIG. 2, the wall body 5b of the orbiting scroll 5 is provided with a wall body inclined portion 5b1 whose height continuously decreases from the outer peripheral side toward the inner peripheral side. An end plate inclined portion 3a1 (see FIG. 1 (a)) that is inclined according to the inclination of the wall body inclined portion 5b1 is provided on the tooth bottom surface of the fixed scroll 3 where the tooth tips of the wall body inclined portion 5b1 face each other. Yes. These wall body inclination part 5b1 and end plate inclination part 3a1 comprise the continuous inclination part. Similarly, the wall body 3b of the fixed scroll 3 is also provided with a wall body inclined portion 3b1 whose height is continuously inclined from the outer peripheral side toward the inner peripheral side, and faces the tooth tip of the wall body inclined portion 3b1. An end plate inclined portion 5 a 1 is provided on the end plate 5 a of the orbiting scroll 5.

  Note that the meaning of “continuous in the inclined portion” in the present embodiment is not limited to the smoothly connected inclination, and small steps that are inevitably generated at the time of processing are connected in a staircase shape. If the part as a whole is included, it is continuously inclined. However, large steps such as so-called stepped scrolls are not included.

  The wall body inclined portions 3b1 and 5b1 and / or the end plate inclined portions 3a1 and 5a1 are coated. Examples of the coating include manganese phosphate treatment and nickel phosphorus plating.

As shown in FIG. 2, wall body flat portions 5b2 and 5b3 having a constant height are provided on the innermost circumferential side and the outermost circumferential side of the wall body 5b of the orbiting scroll 5, respectively. . These wall flat portions 5b2 and 5b3 are provided over a region of 180 ° around the center O2 (see FIG. 1A) of the orbiting scroll 5. Wall body inclined connection portions 5b4 and 5b5 serving as bent portions are respectively provided at positions where the wall body flat portions 5b2 and 5b3 and the wall body inclined portion 5b1 are connected.
Similarly, the bottom of the end plate 5a of the orbiting scroll 5 is provided with flat end plates 5a2 and 5a3 having a constant height. These end plate flat portions 5 a 2 and 5 a 3 are also provided over a 180 ° region around the center of the orbiting scroll 5. At the positions where the end plate flat portions 5a2 and 5a3 and the end plate inclined portion 5a1 are connected, end plate inclined connecting portions 5a4 and 5a5 serving as bent portions are provided, respectively.

  As shown by hatching in FIGS. 3 and 4, the fixed scroll 3 also has the end plate flat portions 3a2 and 3a3, the wall body flat portions 3b2 and 3b3, and the end plate inclined connection portions 3a4 and 3a5 in the same manner as the orbiting scroll 5. And wall body inclination connection part 3b4, 3b5 is provided.

FIG. 5 shows wall bodies 3b and 5b displayed in a spiral direction. As shown in the figure, the innermost wall flat portions 3b2 and 5b2 are provided over a distance D2, and the outermost wall flat portions 3b3 and 5b3 are provided over a distance D3. The distance D2 and the distance D3 are lengths corresponding to the regions 180 degrees around the centers O1 and O2 of the scrolls 3 and 5, respectively. Between the wall flats 3b3,5b3 of innermost wall flats 3b2,5b2 and the outermost side of the wall member inclined portion 3b1,5b1 are provided over a distance D 1. If the height difference between the innermost wall flat portions 3b2 and 5b2 and the outermost wall flat portions 3b3 and 5b3 is h, the inclination φ of the wall inclined portions 3b1 and 5b1 is given by the following equation.
φ = tan ^-1 (h / D1) (1)
Thus, the inclination φ in the inclined portion is constant with respect to the circumferential direction in which the spiral wall bodies 3b and 5b extend.

  FIG. 6 shows an enlarged view of the region indicated by the symbol Z in FIG. As shown in FIG. 6, a tip seal 7 is provided on the tooth tip of the wall 3 b of the fixed scroll 3. The tip seal 7 is made of resin and seals the fluid by contacting the tooth bottom of the end plate 5a of the orbiting scroll 5 facing the tip seal 7. The tip seal 7 is accommodated in a tip seal groove 3d formed in the tooth tip of the wall 3b over the circumferential direction. The compressed fluid enters the tip seal groove 3d, and the tip seal 7 is pressed from the back and pushed out toward the bottom of the tooth to be brought into contact with the opposing tooth bottom. A tip seal is similarly provided on the tooth tip of the wall 5b of the orbiting scroll 5.

  When the scrolls 3 and 5 relatively revolve, the positions of the tooth tip and the tooth bottom are relatively shifted by the turning diameter (turning radius ρ × 2). Due to the positional deviation between the tooth tip and the tooth bottom, the tip clearance between the tooth tip and the tooth bottom changes in the inclined portion. For example, FIG. 7A shows that the tip clearance T is small, and FIG. 7B shows that the tip clearance T is large. Even if the tip clearance T changes due to the swiveling motion, the tip seal 7 is pressed against the tooth bottom side of the end plate 5a by the compressed fluid from the back surface, so that it can be followed and sealed.

The scroll compressor 1 described above operates as follows.
The orbiting scroll 5 performs a revolving orbiting motion around the fixed scroll 3 by a driving source such as an electric motor (not shown). Thereby, the fluid is sucked from the outer peripheral side of the scrolls 3 and 5, and the fluid is taken into the compression chambers surrounded by the walls 3b and 5b and the end plates 3a and 5a. The fluid in the compression chamber is sequentially compressed as it moves from the outer peripheral side to the inner peripheral side, and finally the compressed fluid is discharged from the discharge port 3 c formed in the fixed scroll 3. When the fluid is compressed, the inclined portions formed by the end plate inclined portions 3a1 and 5a1 and the wall body inclined portions 3b1 and 5b1 are also compressed in the height direction of the wall bodies 3b and 5b, and three-dimensional compression is performed. Is called.

  FIG. 8 is a partial enlarged plan view showing the periphery of the end plate inclined connection portion 3a5 of the fixed scroll 3. As shown in FIG. Since the other end plate inclined connection portions 3a4, 5a4, and 5a5 are also described in the same manner, the periphery of the end plate inclined connection portion 3a5 of the fixed scroll 3 will be described below.

  In the same figure, between the inner side 3b-in of the outer peripheral wall 3b of the fixed scroll 3 and the outer side 3b-out of the inner peripheral wall 3b, the outermost end plate flat portion 3a3 and the end plate inclination. Part 3a1 is provided. In addition, the wall 5b of the orbiting scroll 5 is shown in FIG. The wall body 5b is a dimension between the state located at the contact position P1 in contact with the inner side 3b-in of the wall body 3b on the outer peripheral side of the fixed scroll 3, and the inner side 3b-in and the outer side 3b-out of the wall body 3b. The state where it is located in the width center position P2 located in the center of the root width Tg direction is shown. The contact position P1 is the turning center position in the spiral direction (left-right direction in FIG. 8) during the turning motion. In addition, the code | symbol W1 is the centerline in the width direction of the wall 5b.

  A contour line Ct1 is shown at the position of the end plate inclined connecting portion 3a5. The contour line Ct1 is a line segment formed in a direction orthogonal to the spiral direction of the wall 3b. A turning trajectory Tr having a turning radius ρ is shown with an intermediate position in the direction of the tooth bottom width Tg of the contour line Ct1 as the center O3. The turning trajectory Tr is a trajectory of the intersection Cp where the contour line Ct1 and the center line W1 of the wall 5b intersect when the wall 5b is located at the contact position P1.

As can be seen from the contact position P1, the wall body inclined connection portion 5b5 of the wall body 5b is arranged with a phase delay relative to the end plate inclined connection portion 3a5 by the turning radius ρ. The reason is as follows.
If the wall inclined connection portion 5b5 ′ shown by the broken line is arranged so as to coincide with the contour line Ct1 at the contact position P1, in other words, the wall inclined connection portion 5b5 ′ and the end plate inclined connection portion 3a5 have the same phase. As shown in FIG. 9 (a), the shape of the tooth bottom (end plate 3a side) and the tooth tip (wall body 5b side) coincide with each other at the contact position P1. If it becomes position P2, as shown in FIG.9 (b), a tooth root and a tooth tip will interfere. FIG. 9C shows a position where the phase is further advanced by 180 ° from the width center position P2.
Therefore, when the contour line Ct1 is a line segment formed in a direction orthogonal to the spiral direction of the wall body 3b, the wall body inclined connection portion 5b5 ′ and the end plate inclined connection portion 3a5 are arranged in the same phase. I can't.

  Therefore, in the present embodiment, as shown in FIG. 8, the wall body inclined connection portion 5b5 is arranged with a phase delayed by the turning radius ρ with respect to the end plate inclined connection portion 3a5 at the contact position P1. . As a result, as shown in FIG. 10A, the contact position P1 is offset by the turning radius ρ, and the tip clearance T at the end plate inclined connecting portion 3a5 becomes (ρ × tanφ). As shown in FIG. 10B, the tip clearance can be minimized when the turn proceeds to the width center position P2. Note that φ is the inclination of the inclined portion (see FIG. 5).

According to this embodiment, there exist the following effects.
When the contour lines Ct1 are formed in the end plate inclined portions 3a1, 5a1, that is, in the tooth bottom, in the direction orthogonal to the spiral direction of the wall bodies 3b, 5b, the end plate inclined connection portions 3a4, 3a5, 5a4, 5a5 and the wall body If the inclined connecting portions 3b4, 3b5, 5b4, and 5b5 are made to coincide with each other at the turning center position (contact position P1) in the spiral direction, when the scrolls 3 and 5 perform the turning motion, There is a risk of interference. Therefore, the wall inclined connection portions 3b4, 3b5, 5b4, and 5b5 are arranged with the phase delayed by the turning radius ρ with respect to the end plate inclined connection portions 3a4, 3a5, 5a4, and 5a5. Thereby, it can avoid that a tooth base and a tooth tip interfere. Further, when the phase of the wall body inclined connection portions 3b4, 3b5, 5b4, 5b5 advances by the turning radius ρ with respect to the end plate inclined connection portions 3a4, 3a5, 5a4, 5a5, the end plate inclined connection portions 3a4, 3a5. , 5a4, 5a5 and the wall inclined connection portions 3b4, 3b5, 5b4, 5b5 are engaged with each other so that the tip clearance T between the tooth tip and the tooth bottom can be minimized.

[Second Embodiment]
Next, a second embodiment of the present invention will be described. This embodiment is different from the first embodiment in the shape around the end plate inclined connecting portion 3a5 shown in FIG. 8, and the other configurations are the same as those in the first embodiment. Therefore, differences from the first embodiment will be described, and the same reference numerals are given to the same configurations, and the description thereof will be omitted.

  In the first embodiment, the contour line Ct1 is a line segment formed in a direction perpendicular to the spiral direction of the wall body 3b. However, the present embodiment is different in that the contour line is an arc.

  In order to form the contour lines formed as arcs on the end plate inclined portions 3a1 and 5a1, as shown in FIG. With the diameter De of the end mill 10 equal to the root width Tg, the root and the wall side surface are processed in one pass in the upward direction. Processing is performed so that the rotation axis of the end mill 10 is positioned perpendicular to the flat surfaces of the end plate flat portions 3a2, 3a3, 5a2, and 5a3. Thereby, the contour line which becomes a semicircular arc as shown to Fig.11 (a) is formed.

FIG. 12 shows a contour line Ct2 which is a circular arc obtained by the above-described processing method. This figure corresponds to FIG. 8 of the first embodiment.
As shown in FIG. 12, the contour line Ct2 is a semicircular arc having a root width Tg as a diameter and convex toward the end plate inclined portion 3a1 side (left side in FIG. 12). That is, the radius of the contour line Ct2 is Tg / 2. The contour line Ct2 has an intersection Cp0 between the inner side 3b-in of the wall body 3b and the end plate inclined connection portion 3a5, and an intersection point Cp0 between the outer side 3b-out of the wall body 3b and the end plate inclined connection portion 3a5.

The wall body inclined connection portion 5b5 of the wall body 5b is arranged at the contact position P1 so as to coincide with the turning center position in the spiral direction (left-right direction in FIG. 12) during the turning motion. That is, the wall body inclined connection portion 5b5 and the end plate inclined connection portion 3a5 have the same phase. The reason is as follows.
If the wall inclined connection portion 5b5 ′ indicated by the broken line is arranged so as to coincide with the contour line Ct2 at the width center position P2, as shown in FIG. Only the phase is advanced. However, when the turning proceeds and reaches the width center position P2, the tooth bottom and the tooth tip interfere with each other as shown in FIG. FIG. 13C shows a position where the phase is further advanced by 180 ° from the width center position P2.
Therefore, when the contour line Ct2 is a semicircular arc having a diameter equivalent to the root width Tg, the phase of the wall inclined connection portion 5b5 ′ cannot be advanced more than that of the end plate inclined connection portion 3a5.

  Therefore, in the present embodiment, as shown in FIG. 14, the wall body inclined connection portion 5b5 is arranged so as to be in phase with the end plate inclined connection portion 3a5 at the contact position P1. Thereby, as shown to Fig.14 (a), in the contact position P1, it will become the position where the side surface shape of the tooth tip and the side surface shape of the tooth root corresponded. When the phase advances due to the turning motion, the tip clearance T at the width center of the contour line Ct2 becomes {(Tg / 2−ρ) × tanφ} at the width center position P2, as shown in FIG.

According to this embodiment, there exist the following effects.
In the end plate inclined portion 3a1, one semicircular arc having a contact point at the intersection Cp0 between the end plate inclined connecting portion 3a5 and the wall body 3b is formed as a contour line Ct2. Then, the wall inclined connection portion 5b5 is arranged so as to coincide with the end position of the inclined connection portion 3a5 at the turning center position (contact position P1) in the spiral direction during the turning motion, that is, in the same phase. Thus, the tip clearance and the tooth bottom do not interfere with each other during the turning motion, and the tip clearance can be made as small as possible.
Further, since the tip clearance T between the tooth tip and the tooth bottom becomes the smallest between the contacting wall bodies 3b and 5b when in the contact position P1, leakage in the spiral direction of the wall body 3b can be reduced. That is, as shown in FIG. 15, a region A surrounded by the tooth tip of the wall 5b, the tip seal 7, the tooth bottom of the end plate 3a, and the side surface of the wall 3b is a leakage gap in the spiral direction. However, since the tip clearance T can be minimized, leakage in the spiral direction of the wall 3b can be reduced. Reference numeral 5d denotes a tip seal groove formed at the tip of the wall 5b.

[Third Embodiment]
Next, a third embodiment of the present invention will be described. The present embodiment differs from the second embodiment in the shape around the end plate inclined connection portion 3a5 shown in FIG. 12, and the other configurations are the same as those in the second embodiment. Accordingly, differences from the second embodiment will be described, and the same reference numerals are given to the same configurations, and the description thereof will be omitted.

  In the second embodiment, the contour line Ct2 is one semicircular arc. However, in the present embodiment, the contour line Ct2 is different in that the contour lines are two arcs having the same diameter.

In order to form the contour lines formed as two circular arcs in the end plate inclined portions 3a1 and 5a1, as shown in FIG. FIG. 16 is a view corresponding to FIG. 11A, and the end mill 10 is machined by cutting twice (two passes) so as to be inclined in the spiral direction of the wall bodies 3b and 5b. That is, the side wall of one wall 3b and the tooth bottom connected thereto are processed by the first cutting, and the side wall of the other wall 3b and the tooth bottom connected thereto are processed by the second cutting. Thereby, a shape in which two semicircular arcs are connected at the center of the width is a contour line Ct3.
Therefore, in the present embodiment, the relationship is (end mill diameter De <bottom width Tg).

FIG. 17 shows a contour line Ct3 that is an arc obtained by the above-described processing method. This figure corresponds to FIG. 12 of the second embodiment.
As shown in FIG. 17, the contour line Ct3 has a shape in which two arcs having the end mill diameter De as a diameter are connected at the center of the width of the root, and each arc has an end plate inclined portion 3a1 side ( It is convex on the left side in the figure. The contour line Ct3 has an intersection Cp0 between the inner side 3b-in of the wall body 3b and the end plate inclined connection portion 3a5 and an intersection point Cp0 between the outer side 3b-out of the wall body 3b and the end plate inclined connection portion 3a5.

  The wall body inclined connection portion 5b5 of the wall body 5b is arranged at the contact position P1 so as to coincide with the turning center position in the spiral direction (left-right direction in FIG. 17) during the turning motion. That is, the wall body inclined connection portion 5b5 and the end plate inclined connection portion 3a5 have the same phase. The reason is that, as described in the second embodiment, the tooth tip does not contact the tooth bottom and the tip clearance is made as small as possible.

If the distance R from the center O3 of the turning trajectory Tr to the contour line Ct3 in the spiral direction and in the direction of the inclined portion 3a1 becomes smaller than the turning radius ρ, the tooth bottom and the tooth tip interfere with each other. is necessary.
{Tg ² + (2ρ) ² } / (2Tg) ≦ De ≦ Tg (2)
Note that the distance R is represented by the following equation with reference to the geometrical relationship in FIG.
R = (1/2) × {De ² − (Tg−De) ² } ^1/2 (3)

  Moreover, in this embodiment, compared with 2nd Embodiment, since the tip clearance when the wall 5b advances to the width center position P2 becomes small, it is advantageous. This is because the distance R from the center O3 of the turning locus Tr to the contour line Ct3 is shorter than the corresponding distance Tg / 2 (see FIG. 12) of the second embodiment, as is apparent from FIG. .

In order to minimize the tip clearance, the distance R is made equal to the turning radius ρ. Substituting R = ρ into the above equation (3) to solve, the following equation is derived.
De = {Tg ² + (2ρ) ² } / (2Tg) (4)
That is, the contour line Ct3 formed with the end mill diameter De may be used so as to satisfy the above equation.

According to this embodiment, in addition to the effect of 2nd Embodiment, there exist the following effects.
Since the contour line Ct3 is composed of two arcs, the distance R can be made shorter than Tg / 2, so that the chip clearance can be reduced and leakage can be reduced as compared with the second embodiment.

  Further, by forming the contour line Ct3 by two arcs having an end mill diameter De satisfying the expression (4), the contour line Ct3 and the wall inclined connection portion 5b5 when the tooth tip and the tooth bottom are closest to each other during the turning motion. The tip clearance between and can be brought close to zero.

  In the present embodiment, the contour line Ct3 is composed of two arcs having the same diameter, but may be a contour line composed of three or more arcs.

  Moreover, in each embodiment mentioned above, although it was set as the structure which has flat part 3a2, 3a3, 3b2, 3b3, 5a2, 5a3, 5b2, 5b3, the flat part is not provided in the outermost periphery side and / or the innermost periphery side. It can also be applied to configurations. For example, in the case of the first embodiment, the fixed scroll 3 and the orbiting scroll 5 are arranged with their phases shifted by the amount of the orbiting radius in the direction in which the inclined portions facing each other move away. In the case of the second embodiment or the third embodiment, the fixed scroll 3 and the orbiting scroll 5 are arranged so that the phases coincide with each other at the orbital center position in the spiral direction during the orbiting motion.

  Moreover, in each embodiment mentioned above, although demonstrated as a scroll compressor, this invention is applicable also to the scroll expander used as an expander.

1 Scroll compressor (scroll fluid machine)
3 Fixed scroll (first scroll member)
3a End plate (first end plate)
3a1 End plate inclined part 3a2 End plate flat part (inner peripheral side)
3a3 Flat end plate (outside)
3a4 End plate inclined connection (inner circumference side)
3a5 End plate inclined connection (outer side)
3b Wall (first wall)
3b1 Wall body inclined part 3b2 Wall body flat part (inner circumference side)
3b3 Wall flat part (outside)
3b4 Wall inclined connection (inner circumference side)
3b5 Inclined wall connection (outside)
3c Discharge port 5 Orbiting scroll (second scroll member)
5a End plate (second end plate)
5a1 End plate inclined part 5a2 End plate flat part (inner peripheral side)
5a3 Flat end plate (outside)
5b Wall body (second wall body)
5b1 Wall body inclined part 5b2 Wall body flat part (inner circumference side)
5b3 Wall flat part (outside)
5b4 Wall body inclined connection (inner circumference side)
5b5 Wall body inclined connection (outside)
5d Tip seal groove 7 Tip seal 10 End mill Ct1, Ct2, Ct3 Contour line L Distance between opposing surfaces T Tip clearance Tg Bottom width Tr Turning trajectory W1 Wall centerline φ Inclination

Claims (6)

A first scroll member provided with a spiral first wall on the first end plate;
A spiral second wall body is provided on a second end plate disposed so as to face the first end plate, and the second wall body is offset from the first wall body by a turning radius and meshes with the first wall plate. A second scroll member that relatively revolves, and
A scroll fluid machine comprising:
There is an inclined portion in which the distance between the opposing surfaces of the first end plate and the second end plate facing each other continuously decreases from the outer peripheral side to the inner peripheral side of the first wall body and the second wall body. Provided,
The outermost peripheral part and the innermost peripheral part of at least one of the first wall body and the second wall body are provided with a wall body flat part whose height does not change,
At least one of the first end plate and the second end plate is provided with an end plate flat portion corresponding to the wall body flat portion,
At least one of the first wall body and the second wall body forms the inclined part between the wall body flat part of the outermost peripheral part and the wall body flat part of the innermost peripheral part. So as to have a wall inclined portion in which the height of the wall continuously decreases from the outer peripheral side toward the inner peripheral side,
At least one of the first end plate and the second end plate extends from the end plate flat portion of the outermost peripheral portion to the end plate flat portion of the innermost peripheral portion, and the wall body inclined portion. The bottom surface of the tooth surface opposite the tooth tip has an end plate inclined portion inclined according to the inclination of the wall inclined portion,
The length of the wall body inclined portion in the spiral direction is longer than the length of the wall body flat portion in the outermost peripheral portion in the spiral direction, and the length in the spiral direction of the wall flat portion in the innermost peripheral portion. Longer than
The length of the end plate inclined portion in the spiral direction is longer than the length of the end plate flat portion of the outermost peripheral portion in the spiral direction, and the length of the end plate flat portion of the innermost peripheral portion in the spiral direction. Longer than
Contour lines are formed in the end plate inclined portion in a direction perpendicular to the spiral direction of the wall body,
The scroll fluid machine, wherein the first scroll member and the second scroll member are arranged with a phase shifted by an amount corresponding to the turning radius in a direction in which the inclined portions facing each other move away from each other.   In contrast to the end plate inclined connection portion to which the end plate inclined portion and the end plate flat portion are connected, the wall body inclined connection portion to which the wall body inclined portion and the wall body flat portion are connected is the swivel. The scroll fluid machine according to claim 1, wherein the scroll fluid machine is arranged with a phase delayed by a radius. A first scroll member provided with a spiral first wall on the first end plate;
A spiral second wall body is provided on a second end plate disposed so as to face the first end plate, and the second wall body is offset from the first wall body by a turning radius and meshes with the first wall plate. A second scroll member that relatively revolves, and
A scroll fluid machine comprising:
There is an inclined portion in which the distance between the opposing surfaces of the first end plate and the second end plate facing each other continuously decreases from the outer peripheral side to the inner peripheral side of the first wall body and the second wall body. Provided,
The outermost peripheral part and the innermost peripheral part of at least one of the first wall body and the second wall body are provided with a wall body flat part whose height does not change,
At least one of the first end plate and the second end plate is provided with an end plate flat portion corresponding to the wall body flat portion,
At least one of the first wall body and the second wall body forms the inclined part between the wall body flat part of the outermost peripheral part and the wall body flat part of the innermost peripheral part. So as to have a wall inclined portion in which the height of the wall continuously decreases from the outer peripheral side toward the inner peripheral side,
At least one of the first end plate and the second end plate extends from the end plate flat portion of the outermost peripheral portion to the end plate flat portion of the innermost peripheral portion, and the wall body inclined portion. The bottom surface of the tooth surface opposite the tooth tip has an end plate inclined portion inclined according to the inclination of the wall inclined portion,
The length of the wall body inclined portion in the spiral direction is longer than the length of the wall body flat portion in the outermost peripheral portion in the spiral direction, and the length in the spiral direction of the wall flat portion in the innermost peripheral portion. Longer than
The length of the end plate inclined portion in the spiral direction is longer than the length of the end plate flat portion of the outermost peripheral portion in the spiral direction, and the length of the end plate flat portion of the innermost peripheral portion in the spiral direction. Longer than
In the end plate inclined portion, one or a plurality of arcs having a contact point at the intersection with the wall body are formed as contour lines,
The scroll fluid machine, wherein the first scroll member and the second scroll member are arranged so as to have a phase coincident with each other at a turning center position in a spiral direction during the turning motion. In the end plate inclined portion, one or a plurality of circular arcs having a contact point at the intersection of the end plate inclined connecting portion to which the end plate inclined portion and the end plate flat portion are connected and the wall body are formed as contour lines. ,
Arranged so that the wall body inclined connection portion where the wall body inclined portion and the wall body flat portion are connected to the end plate inclined connection portion coincides with the swivel center position in the spiral direction during the revolving motion. The scroll fluid machine according to claim 3, wherein the scroll fluid machine is provided. When the diameter of the arc forming the contour line is De, the root width of the inclined end plate portion is Tg, and the turning radius of the turning motion is ρ,
{Tg2 + (2ρ) 2} / (2Tg) ≦ De ≦ Tg
The scroll fluid machine according to claim 3 or 4, wherein   The scroll fluid machine according to claim 5, wherein De = {Tg2 + (2ρ) 2} / (2Tg).

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