JP3925516B2 - Rotation prevention mechanism of scroll type fluid machine - Google Patents

Description

  The present invention relates to a rotation prevention mechanism for a scroll type fluid machine in which a ring body is provided with first key means for sliding on a stationary member and second key means for sliding on a movable scroll.

  Conventionally, as a mechanism for preventing rotation of a scroll type fluid machine in which a ring body is provided with a first key means that slides on a stationary member, for example, a housing, and a second key means that slides on a movable scroll, a rotation prevention mechanism for a scroll type fluid machine is disclosed in Japanese Patent Application Laid-Open No. Hei 3- What was described in 37080 gazette is known.

  As shown in FIG. 9, a thrust receiving surface provided on an upper portion of a housing B housed in a casing A as a rotation preventing mechanism including a first key means and a second key means in a ring body in a conventional scroll type fluid machine C supports the back surface of the movable scroll E meshing with the fixed scroll D, and slidably supports the ring main body G of the Oldham ring F constituting the rotation prevention mechanism outside the thrust receiving surface C in the housing B. An annular seat H is provided.

  A first key groove J extending in the radial direction is provided in the seat H of the housing B, and a second key groove K extending perpendicularly to the first key groove J is provided on the outer periphery of the movable scroll E. By forming a ring body G having first and second key means L, M engaged with the key grooves J, K in the seat H of the housing B, the drive shaft N The movable scroll E can rotate without rotating on the thrust receiving surface C by the rotation.

  By the way, in the above configuration, since the Oldham ring F is slidably disposed in the seat H, the Oldham ring F is likely to flutter during operation. In order to prevent the occurrence of this, the ring body G of the Oldham ring F is sandwiched between the seat H of the housing B and the back surface of the movable scroll E, but the movable scroll E is fixed to the thrust receiving surface C of the housing B and the fixed scroll D. The clearance that regulates the movement of the Oldham ring changed during operation, and the Oldham ring F moved along with the movement of the movable scroll E, and noise was still generated.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a rotation prevention mechanism for a scroll type fluid machine that can reliably reduce the flapping of the ring body of the rotation prevention mechanism.

  In order to achieve the above object, according to the first aspect of the present invention, the ring main body 61 is provided with first key means 62 and 62 sliding on the stationary member, and second key means 63 and 63 sliding on the movable scroll 3. In the rotation prevention mechanism of the scroll type fluid machine provided with the ring body 61, the one end face of the ring body 61 is brought into contact with the receiving seat 43 provided on the stationary member, and the ring body 61 is positioned below the rear surface of the end plate 31 of the movable scroll 3. Convex bodies 65, 65 are provided on the end surface of the ring body 61 on the side opposite to the seat, and the stationary member 24 facing the seat 43 has a stationary member 24 that is close to the contactable top surface 64 provided on the convex bodies 65, 65. And the axial movement of the ring body 61 within the range of the clearance between the receiving seat 43 and the opposed receiving seat 24 is regulated so that the ring body 61 is not in contact with the end plate 31 of the movable scroll 3. .

  According to the first aspect of the present invention, the ring main body 61 is brought into contact with the seat 43 of the stationary member so that the ring main body 61 is positioned below the rear surface of the end plate 31 of the movable scroll 3, and the convex provided on the ring main body 61 is provided. The contactable top surface 64 of the body 65 is brought close to the opposing receiving seat 24 of the stationary member, and the axial movement of the ring body 61 is restricted within the clearance between the receiving seat 43 and the opposing receiving seat 24, and the ring Since the main body 61 is not in contact with the end plate 31 of the movable scroll 3, the axial movement of the ring main body 61 is reliably restricted within a fixed clearance range in which there is no change between stationary members, and the movable scroll 3 is Even if it moves in the axial direction, flapping of the ring body 61 is suppressed, and noise can be reduced. In addition, since the ring body 61 is sandwiched between the receiving seat 43 and the opposed seat 24 using a stationary member that does not move, such as the movable scroll 3, the pinching tolerance can be reduced as much as possible. It is possible to reduce the twisting in the key grooves of the key means 62 and 63, and to improve the reliability.

  In the invention of claim 2, in the invention of claim 1, the convex body 65 is constituted by the first key means 62, 62, and the first key means 62, 62 is provided with the contactable top surface 64. .

  According to the second aspect of the present invention, since the convex body 65 can be formed using the first key means 62, 62 without separately forming the ring body 61, a simple structure can be achieved without any significant structural change. The fluttering of the ring body 61 can be reduced.

  In the invention according to claim 3, the opposed seat 24 is an end face formed at the same height as the spiral body 23 of the fixed scroll 2.

  According to the third aspect of the invention, the counter seat 24 is an end surface formed at the same height as the spiral body 23 of the fixed scroll 2 so that the height adjustment and the mirror finishing can be easily performed. Can do.

  In the invention according to claim 4, the stealing portion 66 is provided at the inner edge portion of the convex body 65 facing the center side of the ring main body 61.

According to the invention of claim 4, the outer diameter of the ring main body 61 becomes too large by forming the stealing portion 66 on the convex body 65 according to the sliding amount of the ring main body 61 so as not to contact the movable scroll 3. The convex body 65 can be provided without.
According to the fifth aspect of the present invention, the scroll-type fluid machine is provided with the ring body 61 provided with the first key means 62 and 62 sliding on the stationary member and the second key means 63 and 63 sliding on the movable scroll 3. In this rotation prevention mechanism, one end face of the ring main body 61 is brought into contact with a receiving seat 43 provided on the stationary member so that the ring main body 61 is positioned below the rear surface of the end plate 31 of the movable scroll 3 and Convex bodies 65, 65 are provided on the end face on the seat side, and a stationary member that faces the receiving seat 43 is provided with an opposing receiving seat 24 that is close to the contactable top surface 64 provided on the convex bodies 65, 65. The clearance between the convex bodies 65 and 65 and the opposing receiving seat 24 when the one end face is brought into contact with the receiving seat 43 is made smaller than the clearance between the rear surface of the end plate 31 of the movable scroll 3 and the ring main body 61. By The ring body 61 while regulating the axial movement of the ring body 61 is to that the non-contact with the end plate 31 of orbiting scroll 3.

  A first embodiment of the present invention will be described with reference to FIGS. The scroll type fluid machine shown in FIGS. 1 and 2 is a low-pressure dome type scroll compressor, and includes a compression element CF in the upper part of the hermetic casing 1 and a motor M in the lower part of the casing 1. The compression element CF includes a fixed scroll 2 and a movable scroll 3 that are arranged in a vertically opposed manner, and fixes the fixed scroll 2 to a housing 4 that is a stationary member via a bolt B. The thrust receiving surface 41 provided on the movable scroll 3 supports the end face 31 of the movable scroll 3 in a freely rotating manner, and the movable scroll 3 is interlocked with the drive shaft 5 of the motor M, while the casing 1 On the upper side of the fixed scroll 2, a discharge port 21 formed in the fixed scroll 2 is opened, and an external discharge pipe 11 that discharges discharged refrigerant to the outside of the casing. The high-pressure chamber 13 to be opened is partitioned by the end plate 22 of the fixed scroll 2, and the suction pipe 12 is opened at the lower side of the fixed scroll 2, and the low-pressure chamber 14 in which the motor M is disposed is partitioned. .

  Accordingly, the movable scroll 3 revolves with respect to the fixed scroll 2 through the rotation prevention mechanism by the rotation of the drive shaft 5 accompanying the drive of the motor M, and the revolving drive causes the low pressure chamber to pass through the suction pipe 12. 14 is sucked into the compression chamber formed by the scrolls 2 and 3, the sucked gas is compressed, and the compressed gas is discharged from the discharge port 21 to the high pressure chamber 13. Then, it is discharged from the external discharge pipe 11 to the outside of the casing 1.

  In addition, on the upper surface side of the housing 4, an annular surface that contacts one end face of the ring main body 61 of the Oldham ring 6 in the rotation prevention mechanism located below the thrust receiving surface 41 and outward of the thrust receiving surface 41. And a pair of first key grooves 42 and 42 are provided opposite to each other in the diametrical direction, and the first key grooves 42 and 42 are connected to the outer peripheral portion of the movable scroll 3. A pair of second key grooves 32 are provided in the direction orthogonal to the line.

  As shown in FIGS. 2 and 3, the Oldham ring 6 has the first key grooves 42, 42 of the housing 4 on one surface of the annular ring body 61 that is opposed to the housing 4. A pair of the first key means 62 and 62 slidably engaged with each other is provided so as to project, and as shown in FIGS. 1 and 3, the other of the ring main body 61 that is a surface facing the movable scroll 3. A pair of second key means 63 is slidably engaged with the second key grooves 32, 32 of the movable scroll 3 and is positioned in a direction perpendicular to the line connecting the first key means 62, 62. 63, and the ring main body 61 is positioned below the rear surface of the end plate 31 of the movable scroll 3 so as to be in non-contact with the end plate 31 of the movable scroll 3. , The Oldham ring 6 is used to Prevents rotation of roll 3, and a movable scroll 3 constitutes a rotation preventing mechanism for revolving driven relative to the fixed scroll 2.

  Thus, in the scroll compressor described above, the convex surface having the contactable top surface 64 adjacent to the opposite receiving seat 24 on the stationary member side facing the receiving seat 43 on the end surface on the opposite receiving seat side of the ring body 61. A body 65 is provided.

  Specifically, a pair of bifurcated second key grooves 32, 32 are formed on the outer peripheral portion of the end plate of the movable scroll 3, and the second key grooves 32, 32 are passed through in the axial direction. As shown in FIG. 4, the stationary receiving member 24 facing the receiving member 43 of the housing 4 protrudes on the spiral body 23 forming side of the end plate 22 of the fixed scroll 2 and faces the receiving member 43. And a pair having the same height as the spiral body 23, extending radially outward continuously from the outermost periphery of the spiral body 23 at a position facing the second key grooves 32, 32 of the movable scroll 3. The convex walls 25 and 25 are formed, and the end surfaces of the convex walls 25 and 25 are formed as the counter seats 24. At this time, since the counter seat 24 is continuous with the spiral body 23, height adjustment and mirror finishing can be easily performed.

  Then, as shown in FIG. 3, the convex body 65 is formed by the second key means 63, 63 protruding from the ring body 61, and the contactable top surface 64 is formed on the top surface of the second key means 63, 63. The height of the second key means 63, 63 from the end surface of the ring body 61 is such that the top surface 64 of the second key means 63, 63 is accessible when the ring body 61 is disposed in contact with the seat 43. Is close to the end face of the opposed seat 24 of the fixed scroll 2 through a slight gap that can slide.

  As described above, in the first embodiment, the ring body 61 is brought into contact with the receiving seat 43 of the housing 4 that is a stationary member, and the convex body formed by the second key means 63 and 63 provided on the ring body 61. Since the contactable top surface 64 of 65 is brought close to the opposing receiving seat 24 formed on the fixed scroll 2, when the ring body 61 moves in the axial direction, it touches the opposing receiving seat 24 with a slight movement, and the axial direction Movement is prevented.

  Accordingly, since the axial movement of the ring body 61 is reliably restricted within the range of the fixed clearance formed between the stationary members of the housing 4 and the fixed scroll 2, even if the movable scroll 3 moves in the axial direction, the ring Fluttering of the main body 61 is suppressed, and noise can be reduced.

  In addition, since the ring body 61 is sandwiched between the receiving seat 43 and the opposed receiving seat 24 by the stationary member of the housing 4 and the fixed scroll 2 that do not move like the movable scroll 3, the sandwiching intersection should be made as small as possible. In addition, it is possible to reduce the twisting in the key grooves of the key means 62 and 63 provided in the ring main body 61 and improve the reliability.

  Further, since the convex body 65 can be formed by using the second key means 63, 63 without forming the ring body 61 separately, the fluttering of the ring body 61 can be reduced with a simple structure without any significant structural change. it can.

  The convex body 65 may be provided by protruding the second key means 63, 63 separately from the ring body 61.

  Further, as in the second embodiment shown in FIG. 5, the convex body 65 may be provided with a stealing portion 66 made of a step at the inner edge portion facing the center side of the ring body 61 in the convex body 65. Good.

  That is, the ring body of the second key means 63, 63 serving as the convex body 65 is made to pass through the second key grooves 32, 32 provided in the movable scroll 3 only through a portion facing the counter seat 24 formed in the fixed scroll 2. A step portion is formed on the inner side edge portion facing the center side of 61 in accordance with the sliding amount of the ring main body 61 so as not to come into contact with the end plate 31 of the movable scroll 3. By forming the stealing portion 66, the convex body 65 can be provided without the outer diameter of the ring main body 61 becoming too large.

  The above embodiment corresponds to a low pressure dome type scroll type fluid machine, but a third example of the high pressure dome type scroll type fluid machine will be described with reference to FIGS.

  In the third embodiment, the external discharge pipe 11 and the discharge port 21 of the fixed scroll 2 are opened in the casing 1 so that the inside of the casing 1 is in a high pressure state, and the suction is isolated from the high pressure atmosphere by the fixed scroll 2 and the housing 4. The chamber 15 is formed, and the suction pipe 12 is directly connected to the fixed scroll 2.

  The discharge chamber 16 formed above the fixed scroll 2 and having the discharge port 21 opened therein and the motor M are internally provided, and the communication path 18 communicating with the motor chamber 17 having the external discharge pipe 11 opened therein is provided with the fixed scroll 2 and the housing. 4 and formed.

  Accordingly, the movable scroll 3 revolves with respect to the fixed scroll 2 through the rotation prevention mechanism by the rotation of the drive shaft 5 accompanying the drive of the motor M, and the revolving drive causes the suction chamber to pass through the suction chamber 12. 15 is sucked into the compression chamber formed by the scrolls 2, 3, the sucked gas is compressed, and the compressed gas is discharged from the discharge port 21 to the discharge chamber 16. Then, it is sent to the motor chamber 17 through the communication path 18 and discharged from the external discharge pipe 11 to the outside of the casing 1.

  Also, in the third embodiment, one of the ring main bodies 61 of the Oldham ring 6 in the rotation preventing mechanism located on the upper surface side of the housing 4 and outside the thrust receiving surface 41 and below the thrust receiving surface 41. An annular receiving seat 43 is provided to contact the side end surface, and a pair of first key grooves 42 and 42 are provided in the receiving seat 43 so as to face each other in the diametrical direction. A pair of second key grooves 32, 32 are provided in a direction orthogonal to the line connecting the grooves 42, 42, respectively.

  And, like the Oldham ring 6 of FIG. 3 shown in the first embodiment, the Oldham ring 6 has a first key of the housing 4 on one surface of the ring body 61 which is the surface facing the housing 4. A pair of the first key means 62 and 62 that slidably engage with the grooves 42 and 42 are provided so as to project on the other surface of the ring body 61 that faces the movable scroll 3. A pair of second key means 63 and 63 project from the second key grooves 32 and 32 so as to be slidably engaged with each other and positioned in a direction orthogonal to the line connecting the first key means 62 and 62. 6 and 7, the ring body 61 is positioned below the rear surface of the end plate 31 of the movable scroll 3 and is disposed in the seat 43 so as not to contact the movable scroll 3. And the Oldham ring 6 Prevents rotation of the moving scroll 3, and a movable scroll 3 constitutes a rotation preventing mechanism for revolving driven relative to the fixed scroll 2.

  Further, a pair of second key grooves 32, 32 are formed on the outer peripheral portion of the end plate of the movable scroll 3, and the second key grooves 32, 32 are penetrated in the axial direction. As shown, a stationary member-side opposing seat 24 facing the seat 43 of the housing 4 projects from the spiral body 23 forming side over the entire outer periphery of the end plate 22 of the fixed scroll 2, and the spiral body. 23 is formed with a cylindrical convex wall 25 that is in contact with the housing 4 and is opposed to the second key means 63, 63 of the Oldham ring 6 on the end surfaces of the convex walls 25, 25 ( The diagonally shaded portion in FIG.

  At this time, since the opposing receiving seat 24 uses the convex wall 25 that is brought into contact with the housing 4, the opposing receiving seat 24 can be formed without changing the design of the fixed scroll 2.

  And the said convex body 65 is formed by each 2nd key means 63,63 protrudingly provided in the ring main body 61, and the contactable top surface 64 is provided in the top surface of the 2nd key means 63,63, The 2nd key The height of the means 63, 63 from the end surface of the ring body 61 is such that the contactable top surface 64 of the second key means 63, 63 is opposed to the fixed scroll 2 when the ring body 61 is placed in contact with the seat 43. The height is close to the end face of the seat 24 through a slight gap that can slide.

  As described above, also in the high-pressure dome type scroll type fluid machine of the third embodiment, the axial direction of the ring main body 61 by the receiving seat 43 of the housing 4 and the opposing receiving seat 24 formed on the convex wall 25 of the fixed scroll 2. The movement can be restricted, and in the case of a high-pressure dome, since the cylindrical convex wall 25 of the fixed scroll 2 can be used as the counter seat 24, the manufacturing can be facilitated accordingly.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The present invention is defined by the terms of the claims, rather than the scope described above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

1 is a partially cutaway longitudinal sectional view of a scroll type fluid machine having a rotation prevention mechanism of the scroll type fluid machine in the first embodiment of the present invention. Sectional view on the AA line in FIG. 1 of the 1st Example. The top view, side view, and bottom view of the Oldham ring of the rotation prevention mechanism of the present invention are shown. The figure which looked at the fixed scroll in the same 1st Example from the spiral body formation side. Sectional drawing of the principal part of the rotation prevention mechanism of a scroll type fluid machine in 2nd Example of this invention. FIG. 10 is a partially cutaway longitudinal sectional view of a scroll type fluid machine having a rotation prevention mechanism of the scroll type fluid machine in a third embodiment of the present invention. BB sectional drawing in FIG. 6 of the same 3rd Example. The figure which looked at the fixed scroll in the 3rd Example from the spiral body formation side. The fragmentary sectional view which shows the conventional scroll type fluid machine.

Explanation of symbols

  3 movable scroll, 24 counter seat, 43 seat, 61 ring body, 62 first key means, 63 second key means, 64 accessible top surface, 65 convex body, 66 stealing part.

Claims (5)

A scroll type in which a ring body (61) is provided with first key means (62) (62) that slides on a stationary member and second key means (63) (63) that slides on a movable scroll (3). In the anti-rotation mechanism of fluid machinery,
One end surface of the ring body (61) is brought into contact with a seat (43) provided on a stationary member, and the ring body (61) is positioned below the rear surface of the end plate (31) of the movable scroll (3). ,
Protruding bodies (65) and (65) are provided on the end surface of the ring body (61) on the opposite seat side,
A stationary member facing the seat (43) is provided with an opposing seat (24) close to the contactable top surface (64) provided on the convex bodies (65) (65),
By restricting the axial movement of the ring body (61) within the clearance between the seat (43) and the counter seat (24), the ring body (61) is moved to the movable scroll ( 3) A mechanism for preventing rotation of a scroll type fluid machine, wherein the end plate (31) is not in contact with the scroll plate.   The convex body (65) comprises the first key means (62) (62), and the first key means (62) (62) is provided with the accessible top surface (64). The rotation prevention mechanism of the scroll type fluid machine according to claim 1.   The scroll type fluid machine according to claim 1 or 2, wherein the counter seat (24) is an end face formed at the same height as the spiral body (23) of the fixed scroll (2). Anti-rotation mechanism.   The scroll type fluid machine according to any one of claims 1 to 3, wherein a stealing portion (66) is provided at an inward edge portion facing the center side of the ring body (61) in the convex body (65). Anti-rotation mechanism. The ring body (61) has a first key means (62) (62) that slides on the stationary member, and a movable slider.
In the rotation prevention mechanism of the scroll type fluid machine provided with the second key means (63) (63) sliding on the crawl (3),
One end surface of the ring body (61) is brought into contact with a seat (43) provided on a stationary member, and the ring body (61) is positioned below the rear surface of the end plate (31) of the movable scroll (3). ,
Protruding bodies (65) and (65) are provided on the end surface of the ring body (61) on the opposite seat side,
A stationary member facing the seat (43) is provided with an opposing seat (24) close to the contactable top surface (64) provided on the convex bodies (65) (65),
A clearance between the convex bodies (65) and (65) and the counter seat (24) when one side end surface of the ring body (61) is brought into contact with the seat (43) is defined as the movable scroll. By making the clearance smaller than the clearance between the back surface of the end plate (31) and the ring main body (61) of (3), the ring main body (61) is moved while restricting the axial movement of the ring main body (61). A mechanism for preventing rotation of a scroll type fluid machine, wherein the end plate (31) of the movable scroll (3) is not in contact with the end plate (31).

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