JP2020094556A - Fluid machine - Google Patents

Abstract

To provide a fluid machine reducing impact or vibrations in a rotation preventive mechanism portion.SOLUTION: A fluid machine 1 is equipped with a fixing scroll 33 that has a spiral fixing side tooth portion 331, and a swiveling scroll 20 that has a spiral swiveling side tooth portion 22. The fluid machine 1 is equipped with five rotation preventive mechanism portion 50 located around a center axis of the swiveling scroll 20 at generally equal intervals. The fixing side tooth portion 331 and the swiveling side tooth portion 22 have different winding angle range, and a compression chamber 38 for sucking, compressing, and discharging air is formed between them. The rotation preventive mechanism portion 50 has a recessed portion 51 that has a circular inner peripheral wall, and a pin 52 that swivels inside the recessed portion 51 while being regulated by an inner peripheral wall of the recessed portion 51.SELECTED DRAWING: Figure 1

Description

The disclosure herein relates to fluid machinery.

Patent Document 1 discloses a scroll type fluid machine. This fluid machine has a rotation preventing mechanism portion including a restraint member and a pin that is pivoted inside the restraint member while being restricted by the inner peripheral wall of the restraint member. In the fluid machine, the orbiting scroll orbits around the revolving center with respect to the fixed scroll while the rotation preventing mechanism section exerts its function. In this movement, the centrifugal torque acting on the orbiting scroll acts as a force for rotating the orbiting scroll, so that the rotation torque may be reversed in normal and reverse directions especially at high speed rotation.

JP, 2006-194127, A

When the rotation torque reverses in the normal and reverse directions, it is considered that when the rotation changes from the forward rotation to the reverse rotation, the transition does not occur in an instant, but the pin or the like shifts to the reverse rotation while vibrating by itself. It is considered that such behavior is caused by the clearance between the inner peripheral wall of the restraint member and the pin and the coefficient of restitution of the restraint member and the pin, which causes noise.

The object disclosed in this specification is to provide a fluid machine capable of reducing shock and vibration in the rotation preventing mechanism section.

The aspects disclosed in this specification employ different technical means to achieve their respective purposes. Further, the reference numerals in parentheses in the claims and this section are examples showing the correspondence with specific means described in the embodiments described later as one aspect, and limit the technical scope. is not.

One of the disclosed fluid machines has a fixed scroll (33) having a spiral fixed wrap (331), and a spiral angle asymmetrical with respect to the fixed wrap because the fixed scroll has a different winding angle range. And an orbiting scroll (20) having an orbiting side wrap (22) forming a fluid chamber (38) for sucking, compressing and discharging a fluid between the orbiting scroll and the fixed side wrap, and preventing the orbiting scroll from rotating. To this end, there are provided a restricting portion (51) having a circular inner peripheral wall and a projecting portion (52) which is restricted by the inner peripheral wall of the restricting portion and swirls inside the restricting portion, and is provided around the central axis of the orbiting scroll. And five rotation preventing mechanism parts (50) located at substantially equal intervals.

According to this fluid machine, with the structure having five rotation preventing mechanism portions, it is possible to disperse the impact force due to the collision load of the rotation preventing mechanism portion due to the acting force or inertial force acting on the orbiting scroll during compression. As a result, shocks and vibrations in the rotation preventing mechanism can be suppressed, so that noise can be suppressed when the rotation torque is reversed. In a fluid machine provided with a fixed scroll and a revolving scroll in which the fixed side wrap and the orbiting side wrap have an asymmetric spiral structure, it is possible to reduce impact and vibration in the rotation prevention mechanism section.

One of the disclosed fluid machines has a fixed scroll (33) having a spiral fixed side wrap (331) and a fluid chamber (38) for sucking, compressing and discharging air between the fixed scroll (33) and the fixed side wrap. An orbiting scroll (20) having a spiral orbiting side wrap (22) to form, a restricting portion (51) having a circular inner peripheral wall for preventing rotation of the orbiting scroll, and an inner peripheral wall of the restricting portion. And a rotation preventing mechanism portion (50) that is located at substantially equal intervals around the central axis of the orbiting scroll and that has a protruding portion (52) that rotates while being regulated by the inside of the regulating portion.

According to this fluid machine, since air is used as the working fluid, the rotating torque of the orbiting scroll is small irrespective of whether the spiral portion is symmetrical or asymmetrical, and therefore the forward and reverse rotation of the rotating torque is likely to occur. In such a fluid machine, the structure having the five rotation preventing mechanism portions can reduce the collision load of the rotation preventing mechanism portion due to the centrifugal force to disperse the impact and suppress the vibration. As described above, in the fluid machine in which the self-excited vibration of the rotation prevention mechanism is likely to occur and noise is likely to occur, the impact and vibration in the rotation prevention mechanism can be reduced, and the noise can be suppressed.

One of the disclosed fluid machines has a fixed scroll (33) having a spiral fixed side wrap (331) and a fluid chamber (38) for sucking, compressing and discharging a fluid between the fixed scroll (33). An orbiting scroll (20) which has a spiral orbiting side wrap (22) to be formed and is formed of a resin material, and a restricting portion having a circular inner peripheral wall for preventing rotation of the orbiting scroll ( 51) and five rotation preventing mechanisms each having a protruding portion (52) which is regulated by the inner peripheral wall of the regulating portion and swirls inside the regulating portion, and which are located at substantially equal intervals around the central axis of the orbiting scroll. A part (50).

According to this fluid machine, the self-weight of the orbiting scroll is relatively small, the moment of inertia of the orbiting scroll is small, and repulsion and vibration easily occur in the rotation prevention mechanism section. In such a fluid machine, the structure having the five rotation preventing mechanism portions can reduce the collision load of the rotation preventing mechanism portion due to the centrifugal force to disperse the impact and suppress the vibration. Therefore, in a fluid machine in which the moment of inertia of the orbiting scroll is relatively small, it is possible to reduce impact and vibration in the rotation prevention mechanism section.

It is a sectional view showing composition of a fluid machine of a 1st embodiment. FIG. 2 is a partial cross-sectional view taken along the line II-II in FIG. 1 of the fluid machine according to the first embodiment. FIG. 3 is a view showing a state in which the orbiting scroll is eccentrically rotated by 180 degrees with respect to the fixed scroll from the state of FIG. It is a figure for demonstrating the collision force which acts on a pin about the case where five rotation prevention mechanism parts are provided. It is a figure for demonstrating that a rotation prevention mechanism part self-excited vibrates, when a rotation torque reverses normally and reversely. It is a figure which shows the relationship between the number of rotation prevention mechanism parts, and angle (theta)s. It is an experimental result which shows the relationship between the number of rotation prevention mechanism parts and a noise level.

(First embodiment)
A first embodiment disclosing an example of a fluid machine will be described with reference to FIGS. 1 to 7. Fluid machines capable of achieving the objects disclosed herein include machines that compress fluids or devices that expand fluids. The fluid machine 1 disclosed in the first embodiment is capable of compressing or expanding a liquid, a gas, a gas-liquid mixed fluid, or the like adopted as a working fluid, and causing the liquid to flow to the outside. For example, the working fluid is air, water, various refrigerants, or the like.

The fluid machine 1 is a scroll type fluid machine including a fixed scroll 33 and an orbiting scroll 20. In the fluid machine 1, at least the orbiting scroll 20 is made of resin, and can be used without oil. Therefore, the fluid machine 1 does not require an auxiliary device such as an oil separator. The fluid machine 1 can be applied as an air pressure source that supplies clean air, such as medical air or factory air.

First, the configuration of the fluid machine 1 will be described with reference to FIG. As shown in FIG. 1, the fluid machine 1 includes a housing 30, a fixed scroll 33, an orbiting scroll 20, a motor unit 40, and the like. The housing 30 includes a first housing 31 and a second housing 32. Both the first housing 31 and the second housing 32 are formed of a metal having high thermal conductivity such as aluminum. The first housing 31 and the second housing 32 are fixed by bolting or welding. The first housing 31 and the second housing 32 are installed such that their outer walls are exposed to the atmosphere. At least a part of the first housing 31 and the second housing 32 may be made of metal. It is sufficient that the first housing 31 and the second housing 32 are configured so that at least a part thereof is exposed to the atmosphere.

The fixed scroll 33 and the orbiting scroll 20 are provided inside the housing 30. The fixed scroll 33 is configured as a part of the first housing 31. That is, the fixed scroll 33 and the first housing 31 form one member. Hereinafter, the fixed scroll 33 and the orbiting scroll 20 may be collectively referred to as both scroll members. Both scroll members constitute a compression mechanism portion for sucking in, compressing, and discharging air, which is an example of a working fluid. The fixed scroll 33 includes a disk-shaped base portion 330 and a fixed-side tooth portion 331 protruding from the base portion 330. The fixed side tooth portion 331 is a fixed side wrap provided on the fixed scroll 33, and is formed in a spiral shape when the fixed scroll 33 is viewed in the axial direction. A cylindrical wall portion 332 that is coupled to the second housing 32 in the first housing 31 is provided on an outer peripheral edge portion of the base portion 330. As shown in FIGS. 1 and 2, the tubular wall portion 332 projects in the axial direction of the fluid machine 1 so as to surround the base portion 330 from the outer peripheral edge portion of the base portion 330.

The base portion 330 of the first housing 31 is provided with a suction port 34 that supplies air to the compression chamber 38 formed between the scroll members and a discharge port 35 that discharges air from the compression chamber 38. The orbiting scroll 20 has a disk-shaped base portion 21 and a turning-side tooth portion 22 provided on the base portion 21. The orbiting side tooth portion 22 is a orbiting side wrap provided on the orbiting scroll 20, and is formed in a spiral shape when the orbiting scroll 20 is viewed in the axial direction. The compression chamber 38 is a fluid chamber that sucks, compresses, and discharges fluid between the fixed-side wrap and the swirling-side wrap. As shown in FIGS. 2 and 3, the compression chamber 38 is formed in a crescent shape when viewed in the axial direction. A cylindrical boss portion 24 is provided on the side of the base portion 21 opposite to the compression chamber 38.

The fixed-side tooth portion 331 and the swivel-side tooth portion 22 are in a relationship of forming an asymmetric spiral structure having different winding angle ranges. The difference between the winding angle range of the fixed side tooth portion 331 and the winding angle range of the turning side tooth portion 22 is preferably 30 degrees or more. This is because when the scroll has an asymmetrical spiral structure, the inside and outside of the scroll can be effectively used, and the body size can be made smaller than the suction volume. As shown in FIGS. 2 and 3, the fixed-side tooth portion 331 has a spiral portion that is located further radially outward than the radially outer portion of the swivel-side tooth portion 22. The spiral portion of the fixed side tooth portion 331 is provided on the cylindrical wall portion 332. Due to the spiral portion provided on the cylindrical wall portion 332, the winding angle range of the stationary side tooth portion 331 is larger than the winding angle range of the turning side tooth portion 22 by the angle included in the range of 170 degrees to 190 degrees. Is preferred. The range of ±10 degrees with respect to 180 degrees may be replaced with a range corresponding to the dimensional tolerance.

When the fluid machine 1 is an expander that expands a fluid, it has a configuration in which the fluid chamber moves from the central portion of the fixed scroll 33 toward the outer end portion. In this case, the suction port 34 functions as a discharge port and the discharge port 35 functions as a suction port, so that the volume of the fluid chamber changes so as to increase, and the fluid is taken into the fluid chamber from the center side. The fluid will expand.

The orbiting scroll 20 is preferably made of a material having a specific gravity smaller than that of the material forming the fixed scroll 33. This is because this configuration can reduce the vibration of the orbiting scroll 20 due to the centrifugal force, which is advantageous in terms of vibration noise. The orbiting scroll 20 may be made of a material having a smaller specific gravity than the material of which the housing is made. When the fixed scroll 33 is made of aluminum or an alloy containing aluminum, the orbiting scroll 20 is made of a material having a smaller specific gravity than aluminum. The orbiting scroll 20 is made of, for example, a resin having a smaller specific gravity than aluminum. A swivel-side sliding surface 23 that slides on the housing-side sliding surface 36 of the first housing 31 is provided at a portion of the base portion 21 that is radially outward of the swivel-side tooth portion 22.

As shown in FIGS. 1 and 4, the fluid machine 1 includes a rotation preventing mechanism portion 50 for preventing rotation of the orbiting scroll 20. The rotation preventing mechanism section 50 has a restricting section having a circular inner peripheral wall, and a projecting section that is swung inside the restricting section while being restricted by the inner peripheral wall of the restricting section. The fluid machine 1 includes five rotation preventing mechanism parts 50. The five rotation preventing mechanism parts 50 are located around the central axis of the orbiting scroll 20 at substantially equal intervals. The term “substantially evenly spaced” is meant to include a configuration that is evenly spaced and a configuration that is deviated with respect to the equally spaced within a predetermined dimensional tolerance. For example, the predetermined dimensional tolerance is about ±5 degrees.

The rotation prevention mechanism unit 50 includes a recessed portion 51 provided on the base portion 21 of the orbiting scroll 20 on the opposite side of the fixed scroll 33 as a restriction portion. The recess 51 faces an end surface of the second housing 32 that is orthogonal to the rotation axis CL1. The recessed portion 51 has a configuration having an inner peripheral wall having a circular opening end and a bottom portion closing the fixed scroll 33 side of the inner peripheral wall. The inner peripheral wall and the bottom are a part of the base 21 made of resin.

The pin 52 is a rod-shaped body having a holding portion held by the second housing 32 and a tip side portion protruding toward the bottom surface of the recess 51. The holding portion of the pin 52 is held in a state of being press-fitted in a cylindrical recess formed in the second housing 32. The pin 52 is held by the second housing 32 so that the tip of the pin 52 and the bottom surface of the recess 51 are separated from each other. The tip side portion of the pin 52 is displaced while drawing a circular shape along the inner peripheral wall of the recess 51 when the orbiting scroll 20 revolves.

The pin 52 is an example of a protrusion. The shape of the protruding portion is not limited to the rod shape as long as the protruding portion is configured to be pivotable inside the regulating portion while being regulated by the inner peripheral wall of the regulating portion. The protrusion may be, for example, a tubular body.

A motor portion 40 is integrally provided in the second housing 32 on the side opposite to the first housing 31. The motor unit 40 has a stator 42, a rotor 43, a shaft 44, and the like inside a motor case 41. As the motor unit 40, various motors such as a brush motor or a brushless motor can be adopted. The shaft 44 is rotatably provided by a bearing 45 and a bearing 46 provided inside the motor case 41.

The shaft 44 is rotationally driven by the motor unit 40. The end of the shaft 44 is inserted inside the second housing 32. An eccentric portion 47 is fixed to the end of the shaft 44. The central axis CL2 of the eccentric portion 47 is installed at a position eccentric to the rotation axis CL1 of the shaft 44. The eccentric portion 47 is provided inside the boss portion 24 provided on the base portion 21 of the orbiting scroll 20 via a bearing 48.

When the motor section 40 is energized, the shaft 44 rotates about the rotation axis CL1. At that time, the torque output by the motor unit 40 is transmitted to the boss portion 24 of the orbiting scroll 20 via the eccentric portion 47. The orbiting scroll 20 revolves around the rotation axis CL1 of the shaft 44 while being prevented from rotating by the rotation preventing mechanism section 50. The revolution radius is equal to the distance between the central axis CL2 and the rotation axis CL1. At this time, centrifugal force acts on the orbiting scroll 20 and the rotation preventing mechanism 50.

When the orbiting scroll 20 revolves, the compression chamber 38 formed between both scroll members orbits from the radially outer side to the radially inner side. The compression chamber 38 located on the suction port 34 side gradually changes its volume while approaching the rotation axis CL1 or the discharge port 35 while the rotation angle of the shaft 44 changes from 0 degree to 360 degrees. .. As a result, the air supplied from the outside of the fluid machine 1 to the compression chamber 38 through the suction port 34 is compressed, and this air is discharged from the discharge port 35 to the outside of the fluid machine 1. 2 and 3, the volume of the compression chamber 38 gradually increases while the compression chamber 38 approaches the discharge port 35 from the state of FIG. 2 in which the rotation angle of the shaft 44 is 0 degree to the state of FIG. 3 in which it is 180 degrees. It shows a shrinking change.

A back pressure chamber 39 is provided between the surface of the base portion 21 opposite to the fixed scroll 33 and the inner wall of the second housing 32 on the rotary shaft CL1 side. A part of the air compressed in the compression chamber 38 is supplied to the back pressure chamber 39 via the back pressure introduction passage 25 penetrating the base portion 21. The back pressure introducing passage 25 is a passage that connects the compression chamber 38 and the back pressure chamber 39. As a result, the orbiting scroll 20 is biased toward the fixed scroll 33 by the pressure of the air supplied to the back pressure chamber 39.

A housing-side sliding surface 36 that slides on the turning-side sliding surface 23 is provided at a portion of the first housing 31 that faces the turning-side sliding surface 23. When the orbiting scroll 20 revolves, the orbiting scroll 20 is biased toward the fixed scroll 33 by the pressure of air in the back pressure chamber 39. Therefore, the turning side sliding surface 23 and the housing side sliding surface 36 always slide in a state of being in contact with each other. The housing side sliding surface 36 functions as a thrust bearing portion for receiving the axial load of the orbiting scroll 20. The orbiting scroll 20 revolves while being supported by the housing side sliding surface 36 as a thrust bearing portion.

When a gap is created between the orbiting side sliding surface 23 and the housing side sliding surface 36, the high pressure air supplied from the compression chamber 38 to the back pressure chamber 39 passes through the gap and the low pressure inside the fixed scroll 33. It is possible that it leaks into the space. In this embodiment, the orbiting scroll 20 is urged toward the fixed scroll 33 by the pressure of the air in the back pressure chamber 39, so that the orbiting side sliding surface 23 and the housing side sliding surface 36 are reliably in contact with each other. Slide. Therefore, there is an effect of preventing high-pressure air in the back pressure chamber 39 from leaking into the low-pressure space inside the fixed scroll 33. According to this fluid machine 1, it is possible to prevent a decrease in the compression efficiency of air.

The housing side sliding surface 36 is preferably provided with a coating containing self-lubricating fluorine or molybdenum disulfide. As a result, the coefficient of friction of the housing side sliding surface 36 can be lowered. As the fluorine coating, coating with polytetrafluoroethylene is preferable. Further, since this coating is a thin film, it has an effect that heat transfer from the orbiting scroll 20 to the housing 30 is not easily obstructed. Therefore, even when the turning side sliding surface 23 and the housing side sliding surface 36 slide under a higher load, it is possible to suppress the temperature rise of the sliding portion.

The first housing 31 is provided with a recessed portion 37, which is recessed so as to be separated from the orbiting scroll 20, radially outside the housing-side sliding surface 36. The recess 37 is a portion that does not come into contact with the orbiting-side sliding surface 23 of the orbiting scroll 20.

A gap is provided between the tip of the fixed-side tooth portion 331 and the base portion 21 of the orbiting scroll 20. A gap is provided between the tip end of the orbiting side tooth portion 22 and the base portion 330 of the fixed scroll 33. Accordingly, the tip of the fixed-side tooth portion 331 is located closer to the base portion 330 side than the swivel-side sliding surface 23 and the housing-side sliding surface 36, so that the swivel-side sliding surface 23 and the housing-side sliding surface 36 are Slides while making sure contact. This has the effect of preventing high-pressure air in the back pressure chamber 39 from leaking into the low-pressure space inside the fixed scroll 33.

When the orbiting scroll 20 revolves due to the torque output from the motor unit 40, the orbiting side sliding surface 23 and the housing side sliding surface 36 slide. The heat generated by this sliding is diffused through the first housing 31 and the second housing 32 without being trapped in the place, and is radiated from the outer wall to the atmosphere. As a result, the temperature rise due to the sliding of the turning side sliding surface 23 and the housing side sliding surface 36 is suppressed, so that the abrasion resistance of the turning side sliding surface 23 is improved and the resin sliding surface is melted and coagulated. It has the effect of preventing wearing.

When the orbiting scroll 20 orbits with respect to the fixed scroll 33 about the revolving center, the acting force or inertial force acting on the orbiting scroll 20 at the time of compression acts as a force for rotating the orbiting scroll 20. The rotation angle changes due to this action and the clearance between the pin and the inner peripheral wall of the restraint member that restrains the pin. It is considered that this fluctuation becomes smaller as the number of rotation prevention mechanism parts increases, and the behavior of the orbiting scroll becomes stable and contributes to noise suppression.

According to the earnest research, in the case of a fluid machine in which the fixed side wrap and the orbiting side wrap have an asymmetric spiral shape or a fluid machine in which air is used as the working fluid, the rotation torque is likely to be reversed. .. Especially under such conditions, it was confirmed that the number of rotation preventing mechanism parts and the noise suppressing effect are not necessarily proportional.

When the rotation torque is reversed in the normal and reverse directions, it is considered that the pin or the like shifts from the normal rotation to the reverse rotation while vibrating by itself, as shown in FIG. Such behavior is caused not only by the clearance between the inner peripheral wall of the restraint member and the pin, but also by the coefficient of restitution of the restraint member and the pin, and suppressing the reaction force received by the restraint member by the pin reduces vibration and noise. I focused on contributing to.

Therefore, as shown in FIG. 4, among the five rotation prevention mechanism parts 50 included in the fluid machine 1, the rotation prevention mechanism part 50 closest to the position rotated 180 degrees from the reference position is pinned when the rotation torque is reversed. Consider the collision load that 52 receives as a reaction force. Hereinafter, the rotation prevention mechanism unit 50 closest to the position rotated 180 degrees from the reference position will be described with the name "closest to 180 degrees".

Since the angle 52p shown in FIG. 4 is about 36 degrees, the pin 52 closest to 180 degrees collides with the inner peripheral wall of the recess 51 at a position displaced from the position closest to the inner peripheral wall of the recess 51 by centrifugal force. The pin 52 closest to 180 degrees gives a collision load Fp extending obliquely with respect to a common tangent line between the pin 52 and the inner peripheral wall of the recess 51 in FIG. The collision load Fs shown in FIG. 4 is a component force of the collision load Fp. The collision load Fs is smaller than the collision load Fp and is a load applied to the inner peripheral wall by the pin 52 at a position closest to the inner peripheral wall of the recess 51, and a reaction force of this load is a load received by the pin 52. As a result, the collision load Fs is a load in which the collision load Fp is dispersed, and is a load relaxed from Fp. By reducing the collision load Fs, the repulsive force between the pin 52 and the inner peripheral wall can be suppressed, which contributes to suppressing self-excited vibration of the rotation prevention mechanism unit 50.

On the other hand, in the case of a fluid machine having four or six rotation prevention mechanism sections, the rotation prevention mechanism section is present at a position rotated 180 degrees from the reference position. The pin located at 180 degrees gives a collision load Fp to the inner peripheral wall at a position closest to the inner peripheral wall of the recess. In this case, the reaction force of the collision load Fp becomes the load received by the pin 52. Therefore, in the case of a fluid machine having four or six rotation preventing mechanism portions, it is apparent that the reaction force in the circumferential direction received by the pin from the inner peripheral wall is larger than that in the case of having five.

The pin closest to 180 degrees comes closer to a position rotated from the reference position by 180 degrees as the angle θs shown in FIG. 4 increases, in other words, as the number of rotation preventing mechanism sections that are an odd number increases. FIG. 6 illustrates this. According to FIG. 6, the angle θs is the smallest when the number of rotation preventing mechanism parts is five, and as described above, the circumferential reaction force received from the inner peripheral wall by the pin closest to 180 degrees is considered to be the smallest. Be done.

FIG. 7 shows the relationship between the number of rotation prevention mechanism units and the noise level obtained by an experiment using an actual machine. As an actual machine, a working fluid was air, and a fluid machine having a resin-made orbiting scroll and an asymmetric spiral structure in which the orbiting side wrap and the fixed side wrap have different vortex angles is used. According to the result of the experiment using the actual machine shown in FIG. 7, it was found that the noise level was the lowest when the rotation preventing mechanism was five. The results of this experiment support the reduction of the collision load Fs, the reduction of the repulsive force between the pin 52 and the inner peripheral wall, and the reduction of the self-excited vibration of the rotation preventing mechanism 50 described above with reference to FIG.

The effects of the fluid machine 1 of the first embodiment will be described. The fluid machine 1 includes an orbiting scroll 20 having an orbiting side wrap that is in a spiral shape asymmetric with respect to a fixed side wrap, and five rotation preventing mechanism portions that are positioned around the central axis of the orbiting scroll 20 at substantially equal intervals. And 50.

According to the fluid machine 1, with the configuration including the five rotation preventing mechanism portions 50, as described above, the circumferential collision load in the rotation preventing mechanism portions 50 can be reduced and the impact force can be dispersed. As a result, shocks and vibrations in the rotation prevention mechanism unit 50 are suppressed, so that noise can be suppressed when the rotation torque is reversed. The fluid machine 1 including the fixed scroll 33 and the orbiting scroll 20 having an asymmetric spiral structure can reduce impact and vibration in the rotation prevention mechanism section 50.

Further, in the fluid machine 1, the winding angle range of the fixed side wrap is about 180±10 degrees larger than the winding angle range of the turning side wrap. The fluid machine 1 including the fixed scroll 33 and the orbiting scroll 20 having the asymmetric spiral structure having such a relationship can reduce impact and vibration in the rotation prevention mechanism unit 50.

Further, in the fluid machine 1, the fluid chamber between the fixed side wrap and the swirling side wrap sucks, compresses, and discharges air. According to this, in the fluid machine 1 in which air is used as the working fluid and the self-excited vibration of the rotation prevention mechanism section 50 is more likely to occur and the noise is more likely to occur, the impact and vibration in the rotation prevention mechanism section 50 are reduced to reduce the noise. A remarkable effect of suppressing can be provided.

The fluid machine 1 sucks, compresses, and discharges air into the fluid chamber between the fixed-side wrap of the fixed scroll 33 and the orbiting-side wrap of the orbiting scroll 20. The fluid machine 1 includes five rotation preventing mechanism parts 50 that are positioned around the center axis of the orbiting scroll 20 at substantially equal intervals.

According to the fluid machine 1, since air is used as the working fluid, the rotation torque of the orbiting scroll 20 is small even in a symmetrical scroll, and the rotation torque is easily reversed. In the fluid machine 1 having such a configuration including the five rotation preventing mechanism portions 50, the collision load of the rotation preventing mechanism portion 50 due to the centrifugal force can be reduced and the impact force can be dispersed, and the vibration can be suppressed. As described above, in the fluid machine 1 in which the self-excited vibration of the rotation prevention mechanism section 50 is likely to occur and noise is likely to occur, the impact and vibration in the rotation prevention mechanism section 50 can be reduced, and the noise can be suppressed.

Further, the orbiting scroll 20 included in the fluid machine 1 is made of a resin material. According to this, in the fluid machine 1 in which repulsion and vibration are likely to occur in the rotation prevention mechanism unit 50, it is possible to reduce vibration in the rotation prevention mechanism unit 50 and provide a remarkable effect of suppressing noise.

The fluid machine 1 includes an orbiting scroll 20 formed of a resin material, and five rotation preventing mechanism portions 50 located around the center axis of the orbiting scroll 20 at substantially equal intervals.

According to the fluid machine 1, the orbiting scroll 20 has a relatively small self-weight, the orbiting scroll 20 has a small moment of inertia, and repulsion and vibration are likely to occur in the rotation prevention mechanism section 50. In the fluid machine 1 having such a configuration including the five rotation preventing mechanism portions 50, the collision load of the rotation preventing mechanism portion 50 due to the centrifugal force can be reduced, the impact can be dispersed, and the vibration can be suppressed. As described above, in the fluid machine 1 in which the orbiting scroll 20 has a relatively small moment of inertia, it is possible to reduce impact and vibration in the rotation preventing mechanism 50.

Further, in the fluid machine 1, the material of the orbiting scroll 20 is resin. According to this, in the fluid machine 1 in which the orbiting scroll 20, which is lighter in weight, tends to repel and vibrate, it is possible to reduce vibration in the rotation preventing mechanism portion 50 and provide a remarkable effect of suppressing noise. Since the orbiting scroll 20 made of resin has a low surface hardness with respect to metal, it contributes to reducing the repulsive force at the time of collision. Since the resin orbiting scroll 20 is lighter in weight than metal, the self-excited vibration of the rotation preventing mechanism 50 is likely to occur. Then, the fluid machine 1 which can solve the problem of a vibration surface by the structure which has five rotation prevention mechanism parts 50 can be provided.

(Other embodiments)
The disclosure of this specification is not limited to the illustrated embodiments. The disclosure encompasses the illustrated embodiments and variations on them based on them. For example, the disclosure is not limited to the combination of parts and elements shown in the embodiments, and various modifications can be implemented. The disclosure can be implemented in various combinations. The disclosure may have additional parts that may be added to the embodiments. The disclosure includes parts and elements of the embodiments that are omitted. The disclosure includes replacements or combinations of parts, elements between one embodiment and another. The disclosed technical scope is not limited to the description of the embodiments. The disclosed technical scope is shown by the description of the claims, and should be understood to include meaning equivalent to the description of the claims and all modifications within the scope.

Although the fixed scroll 33 is a part of the first housing 31 in the above-described embodiment, it may be configured by a member separate from the first housing 31. The fixed scroll 33, which is a separate member, is integrated with the first housing 31 by being fixed to the first housing 31. Further, although the fixed scroll 33 is described as being formed of a metal such as aluminum in the above-described embodiment, it may be formed of a resin material. In this case, the fixed scroll 33 may be a part of the first housing 31 or a separate member fixed to the first housing 31.

20... Orbiting scroll, 22... Orbiting side teeth (orbiting side wrap)
33... Fixed scroll, 38... Compression chamber (fluid chamber)
50... Rotation prevention mechanism part, 51... Recessed part (regulating part), 52... Pin (protruding part)
331... Fixed-side tooth portion (fixed-side wrap)

Claims (6)

A fixed scroll (33) having a spiral fixed side wrap (331);
The winding angle range is different from that of the fixed side wrap, and the spiral shape is asymmetric with respect to the fixed side wrap to form a fluid chamber (38) for sucking, compressing and discharging fluid with the fixed side wrap. An orbiting scroll (20) having an orbiting side wrap (22),
In order to prevent the orbiting scroll from rotating, a restricting portion (51) having a circular inner peripheral wall and a protruding portion (52) restricted by the inner peripheral wall of the restricting portion and revolving inside the restricting portion (52) are provided. Five rotation preventing mechanism parts (50) each of which is located at substantially equal intervals around the central axis of the orbiting scroll,
A fluid machine comprising: The fluid machine according to claim 1, wherein the winding angle range of the fixed-side wrap is larger than the winding angle range of the turning-side wrap by about 180±10 degrees. The fluid machine according to claim 1 or 2, wherein the fluid chamber sucks, compresses, and discharges air. A fixed scroll (33) having a spiral fixed side wrap (331);
An orbiting scroll (20) having a spiral orbiting side wrap (22) forming a fluid chamber (38) for sucking, compressing and discharging air between the fixed side wrap;
In order to prevent the orbiting scroll from rotating, a restricting portion (51) having a circular inner peripheral wall and a protruding portion (52) restricted by the inner peripheral wall of the restricting portion and revolving inside the restricting portion (52) are provided. Five rotation preventing mechanism parts (50) each of which is located at substantially equal intervals around the central axis of the orbiting scroll,
A fluid machine comprising: The fluid machine according to any one of claims 1 to 4, wherein a material of the orbiting scroll is resin. A fixed scroll (33) having a spiral fixed side wrap (331);
An orbiting scroll (20) made of a resin material, which has a spiral orbiting side wrap (22) forming a fluid chamber (38) for sucking, compressing and discharging a fluid between the fixed side wrap and the fixed side wrap. ,
In order to prevent the orbiting scroll from rotating, a restricting portion (51) having a circular inner peripheral wall and a protruding portion (52) restricted by the inner peripheral wall of the restricting portion and revolving inside the restricting portion (52) are provided. Five rotation preventing mechanism parts (50) each of which is located at substantially equal intervals around the central axis of the orbiting scroll,
A fluid machine comprising:

Images