JP6396090B2 - Oldham ring and scroll compressor - Google Patents

Description

  The present invention relates to an Oldham ring and a scroll compressor including the Oldham ring.

  A scroll compressor used for a refrigeration cycle of an air conditioner, etc. includes a fixed scroll having a spiral wrap and a orbiting scroll. The working gas introduced in is compressed.

  The orbiting scroll of such a scroll compressor compresses the working gas while forcibly reducing the volume of the sealed chamber formed between the fixed scroll and the rotating scroll so that it does not rotate while being orbited by the driving device. An anti-rotation mechanism is provided.

  As this anti-rotation mechanism, an Oldham ring that is usually interposed between the orbiting scroll and the frame (fixed member) is used. FIG. 6 is a perspective view showing an example of a conventional Oldham ring. The Oldham ring 100 includes a ring portion 101, a first key portion 102, and a second key portion 103, and is provided on the orbiting scroll and the frame. A configuration is employed in which the first key portion 102 and the second key portion 103 are engaged with the key groove to prevent rotation.

  However, when an Oldham ring is used as an anti-rotation mechanism, noise (collision noise) is generated by collision with surrounding members due to its own elastic vibration. Normally, collision noise due to high-frequency vibrations of 1,000 Hz or more can be easily reduced by attaching a soundproof cover or the like. However, vibrations with a low frequency of less than 1,000 Hz are also reduced by using the soundproof cover or the like. Therefore, it is necessary to develop an Oldham ring that can reduce such a low-frequency vibration.

  Under such circumstances, a technique for reducing the collision noise caused by the tilt of the Oldham ring by providing a notch or the like so that the center of gravity of the Oldham ring is shifted to the orbiting scroll side has been proposed (see, for example, Patent Document 1). .

JP-A-10-122164

  However, with the technology as described above, the Oldham ring itself can be structured to suppress collision noise caused by vibration of the Oldham ring during compressor operation by intentionally shifting the center of gravity of the Oldham ring. Since the notch or the like is provided in the shaft, the rigidity is lowered, which facilitates elastic vibration, and the vibration noise due to the collision with the surrounding members is not necessarily sufficient.

  The present invention has been made based on the circumstances as described above, and an object of the present invention is to provide an Oldham ring capable of sufficiently reducing vibration noise of less than 1,000 Hz due to a collision with another member, and the Oldham ring. It is in providing the scroll compressor provided.

The invention made to solve the above problems is
It is interposed between the orbiting scroll and the fixed member of the scroll compressor, and has an annular ring portion and a slit-like shape formed on the orbiting scroll so as to protrude from the end surface on the orbiting scroll side in the axial direction of the ring portion. A first key portion that can be inserted into the first key groove, and a second key portion that protrudes from an end surface of the ring portion on the fixing member side in the axial direction and can be inserted into a slit-like second key groove formed in the fixing member. An Oldham ring with a key part,
Ri Der natural frequency is more than 1,000Hz obtained by hitting test,
Rukoto wherein comprises a ring portion annular rib which projects from a portion of the shaft side of the ring portion in the end face of the second key portion side, is formed with the said second key portion ribs are continuously It is an Oldham ring characterized by.

Moreover, another invention made in order to solve the said subject is:
A scroll compressor that is interposed between the orbiting scroll and the frame, has a rotation preventing mechanism that allows orbiting movement of the orbiting scroll and prevents rotation, and the rotation preventing mechanism includes the Oldham ring. This is a scroll compressor.

  In the present specification, “natural frequency” includes both the natural frequency in the fundamental vibration and the natural frequency in the n-fold vibration (n is an integer of 2 or more).

  The present invention can provide an Oldham ring capable of sufficiently reducing vibration noise of less than 1,000 Hz due to a collision with another member, and a scroll compressor including the Oldham ring.

It is a schematic perspective view which shows 1st Embodiment of the Oldham ring of this invention. It is a schematic perspective view which shows 2nd Embodiment of the Oldham ring of this invention. It is a schematic perspective view which shows 3rd Embodiment of the Oldham ring of this invention. It is a schematic longitudinal cross-sectional view which shows the principal part of the scroll compressor equipped with the Oldham ring of FIG. It is a schematic plan view which shows the state which mounted | wore the fixing member with the Oldham ring of FIG. It is a schematic perspective view for demonstrating the conventional Oldham ring.

<Oldham Ring>
The Oldham ring of the present invention is interposed between the orbiting scroll and the fixed member of the scroll compressor, and is formed as an orbiting ring projecting from the annular ring portion and the end surface on the orbiting scroll side in the axial direction of the ring portion. The first key part that can be inserted into the slit-shaped first key groove and the slit-shaped second key groove formed on the fixing member that protrudes from the end surface of the ring part in the axial direction of the fixing member. An Oldham ring provided with a second key portion having a natural frequency of 1,000 Hz or more.

  Since the Oldham ring of the present invention has a natural frequency of 1,000 Hz or more, vibration with a small frequency of less than 1,000 Hz (hereinafter referred to as “low frequency vibration”) due to collision with other members such as a turning scroll and a fixed member. The noise caused by ")" can be sufficiently reduced. This is considered to be because even if the low frequency vibration is applied to the Oldham ring, the vibration is attenuated without resonating. As a result, it is possible to reduce the collision noise in the entire audible range in combination with the noise prevention ability of 1,000 Hz or more when the soundproof cover is attached.

  The natural frequency of the Oldham ring is preferably 1,200 Hz or more, and preferably 1,500 Hz or more, from the viewpoint of effectively reducing low-frequency vibration accompanying collision with other members in the scroll compressor. More preferably, it is 2,000 Hz or more.

  In addition, as a method of calculating | requiring the natural frequency of an Oldham ring, the method of calculating | requiring by numerical calculation, the method of calculating | requiring by a striking test, etc. are mentioned, for example. Among these, the method based on the impact test is preferable in that the natural frequency can be obtained accurately and reliably.

  The material constituting the Oldham ring is preferably a material that can withstand a temperature of at least a few hundreds of degrees Celsius for a long period of time from the viewpoint of the heat resistance of the Oldham ring during operation of the scroll compressor. Examples of the material include steel, aluminum, aluminum alloy, magnesium, and magnesium alloy, but are not limited to such examples.

  Hereinafter, specific embodiments effective for setting the natural frequency of the Oldham ring within the above range will be described with reference to the drawings. However, the present invention is limited to only first to third embodiments described later. Is not to be done.

[First embodiment]
FIG. 1 is a schematic perspective view showing a first embodiment of the Oldham ring of the present invention. The Oldham ring 10 according to the first embodiment of FIG. 1 includes a ring portion 11, a first key portion 12, and a second key portion 13.

  The ring portion 11 is an annular portion that integrally connects a first key portion 12 and a second key portion 13 described later in the Oldham ring 10.

  The 1st key part 12 is a site | part inserted in the slit-shaped 1st keyway formed in the turning scroll which is not shown in the Oldham ring 10. The first key portion 12 protrudes from the end surface 11 a on the orbiting scroll side of the ring portion 11 in the axial direction. Examples of the shape of the first key portion 12 in a plan view include a rectangular shape (see FIG. 1) and a circular shape, but are not limited to such examples.

  The 2nd key part 13 is a site | part inserted in the slit-like 2nd keyway formed in the fixing member which is not shown in the Oldham ring 10. FIG. The second key portion 13 protrudes from the end surface 11 b on the fixing member side in the axial direction of the ring portion 11. Examples of the shape of the second key portion 13 in a plan view include a rectangular shape and a circular shape, but are not limited to this example.

  In the first embodiment, as shown in FIG. 1, the inner peripheral end portion 11 c of the ring portion 11 is more ring-shaped than the inner end portion 12 a of the first key portion 12 and the inner end portion 13 a of the second key portion 13. 11 is projected to the shaft side.

  Thus, in the first embodiment, the inner peripheral end portion 11c of the ring portion 11 is closer to the axial side of the ring portion 11 than the inner end portion 12a of the first key portion 12 and the inner end portion 13a of the second key portion 13. Since the ring width (the width between the outer periphery and the inner periphery of the ring portion) is large, the rigidity of the ring portion 11 can be increased.

  From the viewpoint of improving the rigidity of the Oldham ring 10, the distance (length) L1 between the inner peripheral end portion 11c and the inner end portion 12a is the first key groove 115 (see FIGS. 4 and 5) of the first key portion 12. It is preferably 0.1 times or more of the length L2 along the longitudinal direction, and more preferably 0.5 times or more. Moreover, L1 is preferably 2 times or less, more preferably 1 time or less, from the viewpoint of avoiding interference with other members such as a turning scroll.

  L2 is not less than the length L3 in plan view in the direction orthogonal to the longitudinal direction of the first keyway 115, and the longitudinal direction of the second keyway 311 (see FIGS. 4 and 5) of the second key portion 13. Is preferably equal to or longer than the length (not shown) in plan view in the direction orthogonal to the longitudinal direction of the second keyway 311. Thereby, when the Oldham ring 10 is mounted on the scroll compressor, the support rigidity against the reaction force when contacting the second key groove 311 can be increased.

[Second Embodiment]
FIG. 2 is a schematic perspective view showing a second embodiment of the Oldham ring of the present invention. The Oldham ring 20 according to the second embodiment of FIG. 2 includes a ring portion 21, a first key portion 22, a second key portion 23, and a rib 24. The Oldham ring 20 is different from the first embodiment in that it includes a rib 24.

  The rib 24 is an annular part projecting from a part on the shaft side of the ring part 21 on the end surface 21 a on the second key part 23 side of the ring part 21. In the second embodiment, the rib 24 and the second key portion 23 are formed continuously.

  The height L4 of the rib 24 from the end surface 21a is 0.2 times or more the height L2 of the second key portion 23 (the height of the second key portion 23 from the end surface 21a) from the viewpoint of improving rigidity. Is preferably 0.5 times or more, and more preferably 0.8 times or more. Moreover, it is preferable that L4 is the same as the height L5 of the 2nd key part 23 from a viewpoint of manufacturability.

  From the viewpoint of securing the strength of the rib 24, the thickness L6 of the rib 24 is preferably at least 0.1 times the height L4 of the rib 24, and more preferably at least 0.2 times. Further, L6 is preferably 1.5 times or less, more preferably 1 time or less, from the viewpoint of design ease.

  The ring part 21, the first key part 22 and the second key part 23 are the same as the ring part 11, the first key part 12 and the second key part 13 of the Oldham ring 10 according to the first embodiment, respectively. Therefore, detailed description is omitted.

  Thus, in 2nd Embodiment, since the rib 24 is provided in the Oldham ring 20, the rigidity of the ring part 21 can be improved. In the second embodiment, since the rib 24 and the second key portion 23 are formed continuously, the rigidity of the ring portion 21 can be further increased, and the Oldham ring 20 is attached to the scroll compressor. In this case, it is possible to increase the support rigidity against the reaction force when contacting the second keyway 311 (see FIGS. 4 and 5).

[Third embodiment]
FIG. 3 is a schematic perspective view showing a third embodiment of the Oldham ring of the present invention. The Oldham ring 30 according to the third embodiment of FIG. 3 includes a ring portion 31, a first key portion 32, a second key portion 33, and a rib 34. The Oldham ring 30 is different from the second embodiment in the shape of the ring portion 31.

  The ring portion 31 has an outer peripheral end portion 31a that is retracted closer to the shaft side of the ring portion 31 than the outer end portion 32a of the first key portion 32 and the outer end portion 33a of the second key portion 33 (the outer peripheral end portion 31a). Is positioned on the axial side of the ring portion 31 with respect to the outer end portion 32a and the outer end portion 33a). Therefore, the outer peripheral end portion 31a and the outer end portion 32a, and the outer peripheral end portion 31a and the outer end portion 33a are discontinuous.

  The ring width L7 of the ring portion 31 is set so that the first key groove 115 (see FIGS. 4 and 5) of the first key portion 32 is secured from the viewpoint of securing the holding strength of the first key portion 32 and the second key portion 33 by the ring portion 31. The length along the longitudinal direction of the second key portion 33 and the length along the longitudinal direction of the second key groove 311 (see FIGS. 4 and 5) of the second key portion 33 (the second key portion 33 and the rib 34 are continuous). In this case, the distance (length) between the outer end portion 33a of the second key portion 33 and the inner peripheral end portion 34a of the rib 34) is preferably 0.2 times or more, and 0.4 times. More preferably. In addition, the ring width L7 of the ring portion 31 is preferably 0.8 times or less, and 0.6 times or less than L8, from the viewpoint of expressing the rigidity improvement effect (mass effect) by reducing the weight of the ring portion 31. More preferably.

  The ribs 34 are the same as the ribs 24 according to the second embodiment, and thus detailed description thereof is omitted.

  As described above, in the third embodiment, the outer peripheral end portion 31 a recedes on the shaft side of the ring portion 31 from the outer end portion 32 a of the first key portion 32 and the outer end portion 33 a of the second key portion 33. Therefore, the ring portion 31 can be reduced in weight by the amount that the ring width is smaller than that of the second embodiment, and as a result, the rigidity of the Oldham ring 30 can be further increased by the mass effect. In the third embodiment, since the ribs 34 are provided on the Oldham ring 30, the rigidity of the ring portion 31 can be increased. In the third embodiment, since the rib 34 and the second key portion 33 are formed continuously, the rigidity of the ring portion 31 can be further increased, and the Oldham ring 30 is attached to the scroll compressor. In this case, it is possible to increase the support rigidity against the reaction force when contacting the second keyway 311 (see FIGS. 4 and 5).

<Scroll compressor>
The scroll compressor of the present invention is a scroll compressor that is interposed between the orbiting scroll and the fixed member, has a rotation prevention mechanism that allows the orbiting movement of the orbiting scroll and prevents rotation, and the rotation prevention mechanism includes: The Oldham ring is provided.

  Since the scroll compressor of the present invention includes the Oldham ring, it is possible to sufficiently reduce noise caused by low-frequency vibration accompanying a collision with another member such as a turning scroll or a fixed member.

  Hereinafter, embodiments of the scroll compressor of the present invention using the Oldham ring 10 according to the first embodiment described above will be described with reference to the drawings. However, the present invention is limited to the embodiments described in the drawings. It is not limited.

  FIG. 4 is a schematic longitudinal sectional view showing the main part of the scroll compressor equipped with the Oldham ring 10 of FIG. Note that the positional relationship between the Oldham ring 10 and the orbiting scroll 110 and the frame 310 shown in FIG. 4 is for convenience, and does not necessarily represent a cross section cut along the same plane. FIG. 5 is a schematic plan view showing a state in which the Oldham ring 10 of FIG. 1 is mounted on a frame 310 as a fixing member. In FIG. 5, the phantom line (one-dot chain line) represents the outer edge of the orbiting scroll 110.

  As shown in FIG. 4, the scroll compressor 2 of the present invention has a compression mechanism unit 100, and this compression mechanism unit 100 is connected to an electric motor (drive mechanism) (not shown) via a rotating shaft 200. . The compression mechanism unit 100, the rotating shaft 200, and the electric motor are stored in a sealed container 300.

  The compression mechanism unit 100 is driven by the rotation of the rotary shaft 200 by an electric motor, and compresses a working gas such as a refrigerant. The compression mechanism unit 100 includes a turning scroll 110 and a fixed scroll 120.

  The orbiting scroll 110 has a spiral wrap 112 standing on the surface of the base plate 111, and a boss 113 protruding from the opposite side (back side) of the wrap 112. A swivel bearing 114 is provided at 113.

  The fixed scroll 120 has a spiral wrap 122 standing on the plate surface of the base plate 121.

  On the back side of the base plate 111, an Oldham ring 10 is disposed as a rotation prevention mechanism. As shown in FIGS. 4 and 5, the first key portion 12 of the Oldham ring 10 is inserted so as to slide in the first key groove 115 provided in the orbiting scroll 110. Further, the second key portion 13 of the Oldham ring 10 is inserted so as to slide in a second key groove 311 provided in the frame 310.

  As shown in FIG. 4, the orbiting scroll 110 and the fixed scroll 120 described above are arranged such that a wrap 112 and a wrap 122 mesh with each other.

  A suction port 320 is provided on the outer peripheral side of the orbiting scroll 110 and the fixed scroll 120, and a discharge port 330 is provided at the center of the orbiting scroll 110 and the fixed scroll 120.

  The rotary shaft 200 is pivotally supported by a main bearing 312, and the main bearing 312 is fixed to the hermetic container 300 via a frame 310. A clamp pin 210 is attached to the end of the rotary shaft 200 opposite to the electric motor, and the clamp pin 210 is engaged with the swivel bearing 114.

  Next, the operation mechanism of the scroll compressor 2 will be described. In the compression mechanism 100, when the crankpin 210 rotates eccentrically by the rotation of the rotating shaft 200 connected to the electric motor, the orbiting scroll 110 performs the orbiting motion without rotating with respect to the fixed scroll 120 by the Oldham ring 10. At this time, the working gas sucked from the suction port 320 is introduced into the sealed chamber (compression chamber) formed between the wrap 112 and the wrap 122 from the outer peripheral side of the wrap 112 and the wrap 122.

  Then, the closed chamber into which the working gas has been introduced moves while reducing its volume toward the center of the orbiting scroll 110 as the orbiting scroll 110 moves, and the working gas in the sealed chamber is reduced due to the decrease in the volume. The compressed working gas is discharged out of the scroll compressor 2 through a discharge port 330 provided in the fixed scroll 120 through a discharge chamber 340 and a discharge pipe 350.

  Thus, since the scroll compressor 2 is provided with the Oldham ring 10, the noise caused by the low-frequency vibration caused by the collision between the Oldham ring 10 and other members such as the orbiting scroll and the fixed member is sufficiently reduced. Can be possible.

  The Oldham ring and the scroll compressor according to the present invention are not limited to the configuration of the above-described embodiment, but are shown by the scope of claims, and all within the scope and meaning equivalent to the scope of claims. Is intended to be included.

  For example, in FIGS. 2 and 3, the Oldham rings 20 and 30 in which the rib 24 and the second key portion 23 and the rib 34 and the second key portion 33 are continuously formed have been described. The Oldham ring includes one in which the rib and the second key portion are separated from each other.

  Further, the shape of the first key portion and the second key portion in a plan view (the shape in which L2 is L3 or more) has been described in the first embodiment, but the shape is limited to the first embodiment. For example, the present invention may be applied to an Oldham ring provided with ribs shown in the second and third embodiments.

  4 and 5, the scroll compressor using the Oldham ring according to the first embodiment has been described. However, the scroll compressor according to the present invention is not limited to the second embodiment or the third embodiment. The Oldham ring may be used.

  4 and 5, the hermetic scroll compressor 2 has been described as an example of the scroll compressor. However, the scroll compressor of the present invention is not limited to the hermetic scroll compressor, and is open. A type scroll compressor may be used.

10, 20, 30 Oldham ring 11, 21, 31 Ring portion 12, 22, 32 First key portion 13, 23, 33 Second key portion 2 Scroll compressor 110 Orbiting scroll 115 First key groove 120 Fixed scroll 200 Rotating shaft 300 Sealed container 310 Frame

Claims (4)

It is interposed between the orbiting scroll and the fixed member of the scroll compressor, and has an annular ring portion and a slit-like shape formed on the orbiting scroll so as to protrude from the end surface on the orbiting scroll side in the axial direction of the ring portion. A first key portion that can be inserted into the first key groove, and a second key portion that protrudes from an end surface of the ring portion on the fixing member side in the axial direction and can be inserted into a slit-like second key groove formed in the fixing member. An Oldham ring with a key part,
Ri Der natural frequency is more than 1,000Hz obtained by hitting test,
Rukoto wherein comprises a ring portion annular rib which projects from a portion of the shaft side of the ring portion in the end face of the second key portion side, is formed with the said second key portion ribs are continuously Oldham ring characterized by. 2. The Oldham ring according to claim 1 , wherein an outer peripheral end portion of the ring portion recedes on an axial side of the ring portion with respect to an outer end portion of the first key portion and the second key portion. The length along the longitudinal direction of the first key groove of the first key portion is not less than the length in plan view in the direction orthogonal to the longitudinal direction of the first key groove, and the second key groove of the second key portion longitudinally length along the Oldham ring according to claim 1 or claim 2 is at least the length of the plan view in the direction perpendicular to the longitudinal direction of the second key groove. A scroll compressor having an anti-rotation mechanism that is interposed between the orbiting scroll and the fixed member and that allows orbiting movement of the orbiting scroll and prevents rotation, wherein the anti-rotation mechanism is from claim 1 to claim 2. scroll compressor, characterized in that it comprises an Oldham ring according to any one of 3.

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