JPH0212316Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a positive displacement fluid device, and in particular, the present invention relates to a positive displacement fluid device, in particular, in which two scroll members each having a spiral body fixed on a side plate are arranged such that both spiral bodies are angled with respect to each other. The fluid pockets formed between both spiral coils are moved from the center to the outer periphery or from the outer periphery to the center, and the volume is changed depending on the direction of movement. The present invention relates to a scroll type fluid device.

[Conventional technology]

For scroll-type fluidic devices, U.S. Pat.
It has been disclosed in many patent specifications including No. 801182, and its operating principle is well known.

The fluid pocket in a scroll-type fluid device is formed between a line of contact between the walls of a pair of spirals, which are formed by overlapping a pair of spirals with a 180° shift between them. There was a problem that unless the bodies were arranged so that they faced each other at a complete 180°, even line contact would not be formed between the opposing spiral body walls, and the fluid pocket would not be completely sealed, making fluid transfer impossible. .

Therefore, in the specification of US Pat. No. 3,924,977, the following invention is described. That is, a hole having a certain depth is bored at the end of the plate of the fixed scroll member opposite to the housing bottom (here, the bottom refers to the part to which the fixed scroll member is fixed), and the housing bottom A through hole penetrating from the inside of the housing to the outside of the housing is formed at a position facing the hole, and a bolt consisting of a small diameter shaft portion with a threaded tip and a large diameter head is inserted into the through hole. The bolt head is inserted through the housing so that the head is present inside the housing, and the bolt head is provided with a pin having an axis eccentric from the axis of the bolt, and the pin is inserted into the hole bored in the fixed scroll member. The position of the bottom of the housing and the fixed scroll member is adjusted by rotating the bolt, which is inserted into the housing, to determine an appropriate position, and then the nut is screwed into the threaded portion of the bolt that protrudes outside the housing. It twists and sticks.

[Problem that the invention attempts to solve]

However, in the invention of U.S. Patent No. 3,924,977, the single bolt serving as the relative angle adjusting means is used as a means for fixing the fixed scroll member to the housing (also referred to as relative angle maintaining means), so the fixed scroll If a large load is applied to the member, uneven wear will occur in the fitting and locking portion between the pin provided on the bolt and the hole, and the fitting gap between the locking portion will become larger, making it difficult to obtain an appropriate relative angle. This has resulted in problems such as the fluid pocket being unable to be maintained and the sealing performance of the fluid pocket being deteriorated.

[Means for solving problems]

According to the present invention, a cup-shaped case having an absorption port and a discharge port and having one end open, a front end plate disposed without deviation in the radial direction at one end opening of the cup-shaped case, and the front end plate and the cup-shaped case. a fixing means for fixing the cup-shaped case; a fixed scroll member having a first spiral body on one surface of the first plate; and a fixed scroll member fixedly disposed within the cup-shaped case; a movable scroll member having a second spiral body provided on one surface of a second plate body that meshes with the second spiral body, a main shaft penetrating the front end plate and rotatably supported; a drive mechanism that causes the movable scroll member to perform circular orbital motion while preventing rotation thereof, and the circular orbital motion of the movable scroll member causes the first spiral body and the second spiral body to In a scroll type fluid device capable of moving a closed fluid pocket formed between the spiral bodies from the outer periphery to the center or from the center to the outer periphery, the front end plate and the cup-shaped case Together, the fixing means constitute a relative angle maintaining means for maintaining the relative angle between the first spiral wound body and the second spiral wound body; A scroll-type fluid device is obtained, which is characterized in that it is provided with a relative angle adjusting means for making the relative angle adjustable from the outside.

[Effect]

The relative angle adjusting means adjusts the relative angle between the first spiral body and the second spiral body, and the relative angle maintaining means maintains the relative angle and sets the relative angle with high precision.

Note that if the axis of the angle adjustment rod inserted into the through hole of the front end plate and the axis of the tip of the angle adjustment rod inserted into the hole of the fixed scroll member are eccentric, the relative angle of both scroll members can be adjusted. Fine adjustments can be made and the relative angle between both scroll members can be set with high precision.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS As an embodiment of the present invention, a compressor of a scroll type fluid device will be described in detail with reference to the accompanying drawings.

Referring to FIG. 1, the illustrated compressor has a compressor housing 10 consisting of a front end plate 11 made of aluminum or an aluminum alloy and a cup-shaped portion 12 installed therein.

The front end plate 11 is formed around a through hole 111 through which the main shaft 13 is inserted, and an annular projection 112 concentric with the through hole 111 is formed on the back surface. On the other hand, the cup-shaped part 1
2 is formed by drawing a steel plate or by aluminum die-casting, and has a flange portion 121 extending outward at its opening. The cup-shaped portion 12 has an opening that fits over the annular projection 112 of the front end plate, and the flange portion 12
1 is joined to the back surface of the front end plate 11 and fixed by a plurality of screws 45 or other suitable means. Note that an O-ring 14 is sandwiched between the joints to perform sealing.

A disk rotor 15 is fixed to the inner end of the main shaft 13, and this disk rotor 15 is rotatably supported within an annular projection 112 by a ball bearing 16.

The front end plate 11 also has a main shaft 1.
It has a sleeve 17 that extends forward so as to surround 3. The sleeve 17 may be formed integrally with the front end plate 11, but here it is formed of steel separately from the front end plate, and is attached to the front surface of the front end plate 11 with screws 18. There is. A ball bearing 19 is located at the front end inside the sleeve 17.
is installed and rotatably supports the main shaft 13. The shaft seal assembly 20 is attached to the main shaft 13 in the through hole 111 of the front end plate 11.
assembled on top. The rotation of an external drive source (for example, an automobile engine) is transmitted to the main shaft 13 via an electromagnetic clutch (not shown).

Inside the cup-shaped portion 12 whose opening is closed by the front end plate 11, a fixed scroll member 25, a movable scroll member 26, a movable scroll drive mechanism, and a movable scroll rotation prevention mechanism are provided.

The fixed scroll member 25 generally has a side plate 251
and a spiral body 252 fixed to one side, and the back side of the side plate 251 has several legs 2.
53 is formed to protrude in the axial direction. 2 legs each
53 is attached to the end plate portion 12 of the cup-shaped portion 12 with its tip surface in contact with the inner surface of the end plate portion 122 of the cup-shaped portion 12.
It is fixed to the cup-shaped part 12 by a screw 27 screwed into the leg 253 from the outside of the 2. Note that a seal ring 28 is sandwiched between the distal end surface of the leg 253 and the inner surface of the end plate portion 122 in order to prevent fluid leakage along the thread 27. Further, a seal ring 29 seals between the outer peripheral surface of the side plate 251 and the inner surface of the cup-shaped portion 12.
Therefore, the side plate 251 of the fixed scroll member 25 separates the inside of the cup-shaped portion into a rear chamber 30 where the legs 253 are present and a front chamber 31 where the spiral body 252 is disposed.

A movable scroll member 26 is arranged within the chamber 31 . The movable scroll member 26 has a side plate 26
1 and a spiral body 262 fixed to one side thereof, the spiral body 262 is engaged with the spiral body 252 with an angular deviation of 180° to form a fluid pocket between both spiral bodies. ing. The movable scroll member 26 is connected to a drive mechanism and a rotation prevention mechanism that will be described later, and is configured to revolve around a circular orbit having a radius Ro by the rotation of the main shaft 13. The compressed fluid is compressed.

The radius Ro of a circular orbit is generally (Pitch of the spiral body) - 2 x (Wall thickness of the spiral body)/2 is given by

Next, the drive mechanism of the movable scroll will be explained with reference to FIG. 2 as well as FIG. 1.

A drive pin 151 is provided on the end surface of the disk rotor 15, which is supported by the front end plate 11 by a ball bearing 16, at a position offset from the center so as to protrude in the axial direction.

On the other hand, the side plate 261 of the movable scroll member 26
An annular boss 263 is formed on the opposite surface of the spiral body 262 . In this embodiment, the center of the boss coincides with the center of the spiral of the spiral body 262. A bush 33 in the shape of a thick disk or short shaft is fitted into the boss 263 and rotatably supported via a needle bearing 34 . The bush 33 is integrated with a semicircular balance weight 3 extending in the radial direction.
It has 31. The bushing 33 also has an off-center axial or eccentric hole 332 in which the drive pin 151 is inserted.
are fitted and rotatably supported by needle bearings 32.

Figure 3 shows the center Os of the main shaft 13, the center Oc of the bush 33, the center of the hole 332, and the center of the drive pin 151.
It shows the positional relationship of O _D. That is, in this state
The distance between Os and Oc is chosen as the orbital radius Ro mentioned above,
The eccentric distance ε ₁ of the drive pin 151 and the eccentric distance ε ₂ of the eccentric hole 332 are such that when the drive pin 151 is fitted into the eccentric hole 332, the center Od of both passes through Oc, and the center Od of both passes through Oc.
It is on the opposite side of Os with respect to the line perpendicular to the line connecting Os and Os, and is located at a position further along the rotational direction of the main shaft (in the direction of arrow A shown in Figure 3) than the line connecting Oc and Os. selected for assembly.

In such a configuration of the drive mechanism, the center Oc of the bush 33 can move on a circular arc having a radius ε ₂ centered on the drive pin 151, therefore, its center O _D. That is, when the main shaft 13 rotates, the bush 33 is pulled by the drive pin 151, and a force is exerted to move the center Oc of the bush 33 away from Os, causing the spiral body of the movable scroll to come into contact with the side wall of the spiral body of the fixed scroll. come into contact with Therefore, the center of the movable scroll member 26 orbits around the main shaft center Os with a radius Ro. Of course, at this time, the movable scroll member 26 is prevented from rotating by a rotation prevention mechanism, which will be described later, so it only makes an orbital motion and does not rotate. On the other hand, Butsuyu 3
3 rotates at the same speed as the rotation of the main shaft. This orbital movement of the movable scroll member 26 moves the fluid pockets and compresses the fluid as described above. At this time, a fluid suction port 3 is provided in the cup-shaped portion 12 to supply compressed fluid to the chamber 31.
5. On the other hand, in order to discharge the compressed fluid into the chamber 30, a discharge hole 254 is provided in the center of the side plate 251.
An evacuation port 36 is provided in the cup-shaped portion 12 to form a chamber 30 and to connect the chamber 30 to an external fluid circuit. Note that the line contact portion of the spiral bodies 252 and 262 is always on the plane on which the central axes Os and Oc lie.

A bush 33 having such an eccentric hole 332
When the movable scroll member 26 is driven using the fluid compression force, a pressing force is automatically obtained at the line contact portion of both spirals 262 and 252, thereby ensuring the sealing of the fluid pocket. Ru. Furthermore, since the center Oc of the eccentric bush 33 is rotatable around the center O _D of the drive pin 151,
For example, even if the pitch of the spiral wound body or the wall thickness of the spiral wound body changes due to dimensional errors in the spiral wound bodies 252 and 262, the distance between Oc and Os can be changed accordingly.
Therefore, even if there is such a dimensional error, the movable scroll member 26 can smoothly move.

The balance weight 331 is provided to cancel the centrifugal force F ₁ caused by the circular orbit movement of the movable scroll member 26, bearing 34, and bush 33, and the centrifugal force F ₂ of the balance weight 331
F ₁ cancels out.

FIG. 4 is an exploded perspective view of a rotation prevention mechanism for the movable scroll member, which includes a mechanism for thrust supporting the movable scroll member. This rotation prevention mechanism 3
7 has a fixing ring 371 disposed around the boss 263 of the movable scroll member 26. The fixing ring 371 is fixed to the front end plate 11 by fixing means such as a pin, and has a pair of key grooves 37 extending over one diameter on its axial end face facing the movable scroll member 26.
1a and 371b. Fixed ring 371
A sliding ring 372 is disposed between the movable scroll member 26 and the side plate 261 of the movable scroll member 26. This sliding ring 372 has a pair of keys 372a and 372b extending over one diameter on a surface facing the fixed ring 371.
These keys 372a, 372b
are the key grooves 371a and 371b of the fixing ring 371.
are mated to each other. As a result, the sliding ring 372 is prevented from rotating with respect to the fixed ring 371, but is able to slide in one direction perpendicular to the axis, ie, in the direction of extension of the keyways and keys 371a-372a.

The sliding ring 372 also has a key 3 on the shaft end surface facing the side plate 261 of the movable scroll member 26.
Keys 372c and 372d extend on one diameter 90 degrees apart from the extending direction of keys 72a and 372b. On the other hand, the side plate 26 of the movable scroll member 26
1 is a boss 2 on the surface facing the sliding ring 372.
63 has a pair of key grooves (only one key groove 261a is shown in FIG. 4, and the other extends on the same diameter as the key groove 261a) for receiving keys 372c and 372d. As a result, the movable scroll member 26 is prevented from rotating with respect to the sliding ring 372, but the key and keyway 372c
-261a is slidable in the extending direction.

In this configuration of the rotation prevention mechanism 37, the movable scroll member 26 is slidable in one diameter direction together with the sliding ring 372, and is also slidable alone in another orthogonal diameter direction. Therefore, although the movable scroll member 26 is prevented from rotating, that is, rotating on its own axis, it is allowed to move in two orthogonal directions, so that the above-mentioned circular orbital movement is allowed.

The sliding ring 372 has a plurality of axially perforated pockets 38 arranged at equal angular intervals (however, the key 372a
-372d is excluded), and a bearing ball 39 is held in each pocket 38. The bearing ball 39 has a diameter larger than the thickness of the sliding ring 372 and contacts the opposing surface of the fixed ring 371 and the opposing surface of the side plate 261. Therefore, the movable scroll member 26 is thrust supported on the fixed ring 371 via the balls 39.

Note that the diameter of the pocket 38 only needs to be larger than the diameter of the ball 39. However, since the ball always rolls following the movement of the movable scroll member 26, the diameter dp of the pocket 38 is equal to or greater than the sum of the radius Ro of the circular orbital motion of the movable scroll member and the diameter dp of the ball. A large value (ie, dp≧Ro+d _b ) is selected. If the ball is smaller than this, the ball will not roll and may slide on the contact point with the fixed ring or movable scroll, potentially damaging them.

Moreover, if it is too large, the ball position may not be constant and there is a risk of wobbling.

Next, relative angle adjustment of both scroll members will be explained.

A relative angle setting hole 255 having a certain depth in the axial direction is formed near the outer periphery of the spiral body 252 of the fixed scroll member 25. Further, an angle reference hole 113 passing through the front end plate 11 is bored at a position opposite to the relative angle setting hole 255 of the front end plate 11 . The relative angle setting hole 255 and the angle reference hole 113 together function as relative angle adjustment means that allows the relative angle between the spiral bodies 252 and 262 to be adjusted from the outside.
Note that the angle reference hole 113 has a threaded portion 11 at its outer end.
3a, and a counterbore portion 113b is formed at the outer end opening.

The angle adjustment is performed as follows. Cup-shaped portion 12 to which fixed scroll member 25 is fixed
After arranging the movable scroll member 26, the movable scroll member drive mechanism, and the rotation prevention mechanism 37 inside, the front end plate 11 is disposed to close the opening of the cup-shaped portion 12. After that, attach the angle adjustment rod 40 to the front end plate 1 as shown in FIG.
1 into the angle reference hole 113 from the outside so that the tip of the angle adjustment rod 40 is fully inserted into the relative angle setting hole 255 of the fixed scroll member 25, and in this state, insert the front end plate 11 into the cup-shaped part. 12 with a plurality of screws 45 as in the conventional case. Thereafter, the angle adjustment rod 40 is pulled out, and the plug 41 is screwed into the threaded portion formed at the outer end of the angle reference hole 113 via the sealing member 42 to close and seal the angle reference hole 113. In this way, the relative angle adjustment work of both scroll members is completed, and the relative angle of both scroll members is maintained.
Here, the end plate 11, the cup-shaped portion 12,
and the screw 45 together, the spiral bodies 252 and 2
It functions as a relative angle maintaining means for maintaining a relative angle of 62.

Furthermore, when used as a compressor, small angular deviations during machining accuracy or assembly will greatly affect performance, so it is necessary to prepare an angle adjustment rod that can adjust even this small angular deviation. be. Since FIG. 5 also shows an angle adjustment rod that can adjust this slight angular deviation, we will explain the angle adjustment rod 40 with reference to FIG. The adjustment will be explained next.

The angle adjustment rod 40 is the front end plate 11
The diameter B passing through the angle reference hole 113 drilled in
The base 40a is made up of a base 40a having a diameter A and a tip 40b having a diameter A that is inserted into a relative angle setting hole 255 formed in the fixed scroll member 25.
and the tip portion 40b have a stepped shape with different diameters, and the axes of both portions 40a and 40b are eccentric (shown as eccentricity B-A/2=C in FIG. 5). ing. This tip 40b and base 40a
By assembling the angle adjusting rod 40 eccentrically by the eccentric amount C, the relative angle setting hole 255 can be moved in the circumferential direction by the eccentric amount C of the angle adjusting rod 40 with respect to the angle reference hole 113. . Therefore, if the assembly work is performed using the angle adjustment rod 40 having an eccentricity C that matches the width of the relative angle deviation between both scroll members, a highly accurate combination can be easily achieved.

The embodiments in which the present invention is applied to a compressor equipped with a drive mechanism and a rotation prevention mechanism of a specific structure have been described above, but these are not intended to limit the present invention, and the present invention can be applied to various other configurations. Applicable to scroll type fluid devices.

[Effect of the invention] As described above, in the present invention, the relative angle adjusting means and the relative angle maintaining means for both the spiral bodies are separate, so even if a large load is applied to the fixed scroll member, the relative angle between the two spiral bodies can be maintained. The angle is maintained properly without compromising the seal of the fluid pocket.

In addition, if an angle adjustment rod is used in which the axis of the angle adjustment rod inserted into the through hole of the front end plate and the axis of the tip of the angle adjustment rod inserted into the hole of the fixed scroll member are eccentric, it is possible to The relative angle of both scroll members can be set with high precision. An additional advantage is that even if it becomes necessary to adjust the relative angle of both scroll members after assembly, readjustment can be made simply by releasing the fixation of the front end plate.

[Brief explanation of the drawing]

FIG. 1 is a central longitudinal sectional view of a compressor embodying the present invention, and FIG. 2 is an exploded perspective view of a drive mechanism for a movable scroll member in the compressor of FIG.
Fig. 3 is a diagram showing the arrangement of parts of the drive mechanism, Fig. 4 is a perspective view showing the rotation prevention mechanism in the compressor of Fig. 1, and Fig. 5 is a general view of the angle adjustment rod. . 10...Compressor housing, 11...Front end plate, 113...Angle reference hole, 113
a...Threaded part, 113b...Spotted part, 12...
Cup-shaped portion, 13...Main shaft, 20...Shaft seal assembly, 25...Fixed scroll member, 2
51... Side plate, 252... Spiral body, 255...
Relative angle setting hole, 26...movable scroll member,
261... Side plate, 262... Spiral body, 40...
Angle adjustment rod, 40a... base, 40b... tip.

Claims (1)

[Scope of utility model registration request] A cup-shaped case having an absorption port and a discharge port and opened at one end, a front end plate disposed without shifting in the radial direction at the opening at one end of the cup-shaped case, and fixing the front end plate and the cup-shaped case. a fixed scroll member having a first spiral body provided on one surface of the first plate body and fixedly disposed within the cup-shaped case; and a second scroll member that meshes with the first spiral body at a shifted angle.
a movable scroll member having a spiral body provided on one surface of a second plate; a main shaft penetrating the front end plate and rotatably supported; and rotation of the movable scroll member by rotation of the main shaft. and a drive mechanism for performing circular orbital motion while blocking the movable scroll member, and a blockage formed between the first spiral body and the second spiral body by the circular orbital motion of the movable scroll member. In a scroll-type fluid device capable of moving a fluid pocket from the outer periphery to the center or from the center to the outer periphery of both spiral bodies, the front end plate, the cup-shaped case, and the fixing means are combined. , constitutes a relative angle maintaining means for maintaining a relative angle between the first spiral wound body and the second spiral wound body, and further includes, separately from the relative angle maintaining means,
Relative angle adjustment means is provided to enable the relative angle to be adjusted from the outside, and the relative angle adjustment means opens toward the front end plate near the outer periphery of the first spiral body of the fixed scroll member, A scroll-type fluid device comprising: a relative angle setting hole extending in the direction; and an angle reference hole penetrating in the axial direction at a position facing the relative angle setting hole of the front end plate.