JPH03156185A - Scroll type fluid machine - Google Patents

Abstract

PURPOSE:To readily manufacture a scroll type fluid machine while securing a sufficient degree of the accuracy of machining by forming both scroll members of moldings, and finishing at least end plates into almost the same configuration and the same size. CONSTITUTION:Since this scroll type fluid machine comprises both scroll members 30, 40 formed by plastic moldings, the time end cost for machining are both reduced and so its manufacture is facilitated. Both scroll members 30, 40 are set as the same configuration and the same size except spiral pieces 39, 49 and so both metal molds used for molding the scroll members 30, 40 can be formed with almost the same configuration and the same size and requirements for molding them can also be made equal, whereby both scroll members 30, 40 can be machined accurately. Since the spiral pieces 39, 49 are set as symmetrical configuration, both scroll members 30, 40 can be formed using a common metal mold by reversing metal molds for molding the spiral pieces 39, 49; which should further enhance the accuracy of machining.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a scroll-type fluid machine applicable to blower devices, compressors, vacuum pump devices, expanders, and the like.

(Prior Art) FIG. 6 is a sectional view showing a conventional scroll-type fluid machine such as a scroll-type compressor. As shown in the figure, on the spiral piece 3 of the fixed scroll member 2 fixed to the casing 1,
With the spiral pieces 5 of the orbiting scroll member 4 engaged,
The orbiting scroll member 4 is rotatably supported by the orbiting drive eccentric shaft 6. Then, when the rotary drive shaft 7 is driven by the drive of the motor M and the eccentric shaft 6 rotates eccentrically, the orbiting scroll member 4 makes an orbital movement around the axis of the rotary drive shaft 7 while being prevented from rotating by the Oldham ring 11. do. As a result, each sealed chamber 8 formed between the spiral pieces 3 and 5 of both scroll members 2.4 moves toward the spiral center while reducing its volume, and the fluid taken in from the suction port 9 is It is compressed and discharged from the discharge port 10.

(Problems to be Solved by the Invention) In such a scroll-type fluid machine, the scroll member 2.4 is manufactured by subjecting a metal material to NC processing. Therefore, there was a problem in that it required a large amount of processing time and cost and was difficult to manufacture.

Therefore, it has been proposed to form the scroll member 2.4 using a molding technique such as plastic molding, which is easy to manufacture. However, the processing accuracy of plastic molded bodies is generally lower than that of NC-processed products, especially when the scroll members 2 and 4 have different shapes and dimensions as in the conventional scroll-type fluid machine mentioned above. If so, the precision of the mold used for plastic molding and the molding conditions will differ depending on both scroll members 2.4, resulting in a problem of reduced processing precision.

In addition, molded bodies formed by plastic molding generally have low strength, and problems arise in terms of strength as well.

In addition, in plastic molding, it is generally difficult to form a thick molded product with a uniform thickness, and when forming an orbiting scroll 4 as shown in FIG. 6, a recess is formed on the back side of the orbiting scroll 4. There is a need. However, if the four portions are formed on the back side of the orbiting scroll 4, a problem arises in that lubricant such as grease placed on the Oldham ring 11 enters the recess and is dissipated.

(Objective of the Invention) The first object of the present invention is to provide a scroll-type fluid machine that can be easily manufactured while ensuring sufficient processing accuracy.

A second object of the present invention is to provide a scroll-type fluid machine that achieves the first object and further ensures sufficient strength.

A third object of the present invention is to provide a scroll-type fluid machine that achieves the first object and further prevents lubricant from dissipating.

(Means for Solving the Problem) The invention as set forth in claim 1 provides a pair of scroll members each having a spiral piece protruding from one surface side of an end plate, in a state where the respective spiral pieces are mutually engaged. A scroll type fluid machine in which a scroll member on one side orbits in such a manner that it does not apparently rotate relative to the scroll member on the other side, and in order to achieve the above first object, each of the pair of scroll members is made of a molded body. At least the end plates of the pair of scroll members are finished to have substantially the same shape and dimensions.

In order to achieve the above-mentioned second object, the invention according to claim 2 is the invention according to claim 1, wherein a reinforcing plate is fixed to the other side of each end plate of the pair of scroll members. ing.

In addition, in order to achieve the second object, the invention according to claim 3 provides the invention according to claim 2, wherein the reinforcing plate attached to the end plate of the scroll member on the -blade side is a thrust plate; A reinforcing plate attached to the end plate of the scroll member on the other side is constituted by a scroll cover.

According to a fourth aspect of the invention, in order to achieve the third object, in the first aspect of the invention, the entire other surface of the end plate of the one scroll member is covered with a sealing member.

In order to achieve the third object, the invention according to claim 5 provides a thrust plate disposed on the outer periphery of the other surface of the end plate, and a thrust plate disposed on the outer periphery of the other surface of the end plate. It consists of a sliding plate placed on the inner periphery.

The invention according to claim 6 is the invention according to claim 1,
A hole having the same =j method is formed in the center of each end plate of the pair of scroll members, and a hole formed on the one side of the scroll member among the holes is configured to connect an eccentric shaft for rotational drive. In addition to being used as a bearing hole for holding, a hole formed on the other side of the scroll member is used as a fluid passage port.

(Embodiment) FIG. 1 is a sectional view showing a scroll type fluid machine which is an embodiment of the present invention. As shown in the figure, a motor 21 is housed in a substantially cylindrical motor case 20, and an opening on one end side of the motor case 20 is provided with a motor shaft 22.
is occluded by Further, the opening on the other end side of the motor case 20 is closed by a seal bracket 23, and a rotary drive shaft 24 of the motor 21 is disposed through the center of the seal bracket 23. In addition, the rotation drive shaft 24
An eccentric shaft 25 is fixed to the tip of the eccentric shaft 2.
5 is configured to eccentrically rotate in conjunction with the rotation of the rotary drive shaft 24.

FIGS. 2 and 3 show a fixed scroll member 30, respectively.
Figure 4 is the front view and back view showing IV-I of Figure 3.
It is a sectional view taken along the V line. As shown in these figures, the fixed scroll member 30 is made of a molded body formed by plastic molding such as injection molding. That is, the substantially disk-shaped end plate 31 is finished thin and uniformly, and a through hole 32 is formed in the center. Furthermore, the back side of the end plate 31 (
A plurality of reinforcing ribs 33 are protruded along the radial direction and the circumferential direction on the other surface side, respectively, and a plurality of four parts are formed so as to be surrounded by the respective ribs 33.

Further, first to fourth mounting holes 34 to 37 are formed in this order from the inner circumference to the outer circumference on the back side of the end plate 31. Moreover, a spiral piece 39 finished in an involute or a curved shape similar to the involute is integrally provided on the front surface side (-side) of the end plate 31 in a protruding manner. Note that the dimensions of the fixed scroll member 30 are set to the minimum within a range that satisfies required fluid performance such as discharge pressure.

On the other hand, the orbiting scroll member 40 has the same shape and dimensions as the fixed scroll member 30 except for the spiral piece 39. That is, the spiral piece 49 of the orbiting scroll member 40 is finished in a bilaterally symmetrical shape so that the spiral direction is opposite to that of the spiral piece 39 of the fixed scroll member 30. The rest of the structure of the orbiting scroll member 40 is the same as that of the fixed scroll member 30 described above, so corresponding parts are shown in parentheses in FIGS. 2 to 4, and their explanation will be omitted.

As shown in FIG. 1, a substantially cylindrical bearing case 50 is fitted into the through hole 32 of the orbiting scroll member 40, and a fixing member 51 penetrated through the flange of the bearing case 50 is attached to the end plate 32. The bearing case 5o is fixed to the orbiting scroll member 40 by being fastened to the first mounting hole 44 (see FIG. 3).

Furthermore, one end side opening of the bearing case 50 is provided with a bearing cover 52.
is occluded by

In addition, a substantially disk-shaped sliding plate 53 with high strength is disposed in the inner circumferential area on the back side of the end plate 41 of the orbiting scroll member 4o, and a fixing member 54 passing through the sliding plate 53 is attached to the end plate. 41 (see FIG. 3), and the sliding plate 53 is fixed to the end plate 41. Furthermore, a substantially disk-shaped thrust plate 55 with high strength is disposed in the outer peripheral area on the back side of the end plate 41, and a fixing member 56 that penetrates the thrust plate 55 is disposed.
is fastened to the fourth attachment hole 47 of the end plate 41, and the thrust plate 55 is fixed to the end plate 41.

In this way, the sliding plate 53 and the thrust plate 55
The entire back surface side of the end plate 41 is covered with this.

The bearing case 50 attached to the orbiting scroll member 40 is rotatably attached to the eccentric shaft 25 via a bearing 26.

On the other hand, the orbiting scroll member 40 and the seal bracket 23
An anti-rotation mechanism including an Oldham ring 60 is disposed between the two. In the anti-rotation mechanism, a linear groove 53a is formed on the surface of the 1n moving plate 53 facing the seal bracket 23 along the vertical direction toward the paper surface of FIG. A straight groove (not shown) is formed on the opposing surface along a direction perpendicular to the straight groove 53a. Also,
An Oldham ring 60 disposed between the seal bracket 23 and the sliding plate 53 has Oldham keys 61 (only one side shown in FIG. 1) protruding from both sides corresponding to the linear grooves 53a, respectively. has been done. The Oldham key 61 on the blade side is slidably housed in the linear groove 53a of the seal bracket 23, while the Oldham key on the other side (not shown) is inserted into the linear groove 53a of the seal bracket 23.
(not shown). In this way, the orbiting scroll member 40 is configured to rotate around the axis of the rotary drive shaft 24 in conjunction with the eccentric rotation of the eccentric shaft 25 while being prevented from rotating by the Oldham key 61.

On the other hand, a substantially cylindrical scroll casing 62 is fixed to the motor case 20 so as to house the orbiting scroll member 40 therein, and the scroll casing 6
A through hole 63 is formed in the body portion of 2.

On the back side of the fixed scroll member 30, a strong, substantially disk-shaped scroll cover 64 is provided with a through hole 64 in the center thereof.
The end plate 31 is arranged with the end a facing the through hole 32 of the end plate 31. Further, a positioning pin (not shown) passing through the scroll cover 64 is inserted into the third mounting hole 36 (see FIG. 3) of the end plate 31 to position the fixed scroll member 30 and the scroll cover 64, and A fastener 66 passing through the outer circumference of the cover 64 is fastened to the fourth mounting hole 37 (see FIG. 3) of the end plate 31.
Fixed scroll member 30 is fixed to scroll cover 64. And the spiral piece 39 of the fixed scroll member 30
The outer peripheral edge of the scroll cover 64 is fixed to the scroll casing 62 in a state in which the scroll cover 64 is engaged with the spiral piece 49 of the orbiting scroll member 40.

When used as a blower device or compressor in this scroll type fluid machine, the scroll casing 6
The through hole 63 of No. 2 becomes the suction port, and the fixed scroll member 3
0 through hole 32 and through hole 6 of scroll cover 64
4a serves as a discharge port (fluid passage port).

That is, when the eccentric shaft 25 rotates eccentrically via the rotary drive shaft 24 due to the drive of the motor 21, the orbiting scroll member 40 moves toward the fixed scroll member 3 as shown in FIG. 5A.
It rotates clockwise in the figure without changing its attitude with respect to 0 (apparently not rotating). As a result, each sealed chamber formed between the spiral pieces 39, 49 of both scroll members 30, 40 moves in the same direction while reducing its volume, and gradually moves to the center of both scroll members 30, 40. be guided.

As a result, as shown in FIG. 5B, the gas taken in from the through hole (intake port) 63 of the scroll casing 62 is gradually compressed, and then the gas is gradually compressed.
It is discharged from a.

When used as a vacuum pump device, the same operation as described above may be performed with the through holes 32.64a open to the atmosphere to cause suction through the through holes 63. In addition, when used as an expander, the through hole 32.64a
The orbiting scroll member 40 may be rotated in the opposite direction (counterclockwise in FIG. 5A) by using the through hole 63 as an inlet port and the through hole 63 as an outlet port.

According to this scroll-type fluid machine, since both scroll members 30 and 40 are each made of a plastic molded body, the processing time and cost are reduced and manufacturing becomes easy.

Also, both scroll members 30, 40 have their spiral pieces 39
．． Since they are set to have the same shape and the same dimensions except for 49, the shapes and dimensions of both molds can be formed to be almost the same when molding both scroll members 30 and 40, and the molding conditions can also be made the same. Both scroll members 30
．． 40 can be processed with high precision. In this case, since the spiral pieces 39 and 49 are set to have a symmetrical shape,
By inverting and using the mold for forming the spiral piece 39.49, both scroll members 30.40 can be formed using a common mold. In this case, processing accuracy will further improve.

Furthermore, since the dimensions of both scroll members 30 and 40 are set to the minimum necessary within the range that satisfies the required fluid performance, the deterioration of processing accuracy, which decreases as the dimensions increase, is prevented. .

Moreover, since the highly rigid sliding plate 53 and thrust plate 55 are fixed to the orbiting scroll member 40, and the fixed scroll member 30 is fixed to the highly rigid scroll cover 64, both scroll members 30, which are molded bodies. 40 is sufficiently ensured, and deformation such as warping of both scroll members 30 and 40 can be prevented.

In addition, since the entire back side of the end plate 41 of the orbiting scroll member 40 is covered with the sliding plate 53 and the thrust plate 55, all four parts formed between the ribs 33 of the end plate 41 are closed, and the Oldham ring A lubricant such as grease disposed around the periphery of the lubricant 60 does not enter the recess, thereby preventing the lubricant from dissipating. Moreover, since the peripheral edge of the through hole 42 of the orbiting scroll member 40 is also covered by the bearing case 50, the lubricant does not enter the through hole 42, and dissipation of the lubricant is also prevented in this respect.

Furthermore, through holes 32 and 42 of the same size are formed in the fixed scroll member 30 and the orbiting scroll member 40, respectively, and the through holes 32 and 42 are used as fluid passage ports and as bearing holes, respectively, so that both scrolls Member 30.
There is no need to perform different types of drilling on each of the scroll members 30 and 40, and both scroll members 30 and 40 can be manufactured easily in this respect as well. Similarly, the mounting holes 34 to 37 formed in both end plates 31 and 41 are selectively used on the fixed scroll side and the orbiting scroll side as necessary, so that common parts are achieved and this point is also improved. Manufacturing becomes easier.

Note that in the above embodiment, both scroll members 30.
40 is formed by injection molding, but it may be formed by other molding processes, for example, by aluminum die casting.

(Effects of the Invention) As described above, according to the scroll type fluid machine according to claim 1, since both scroll members are constructed of molded bodies and at least the end plates are finished to have substantially the same shape and dimensions, The first effect is that it can be manufactured easily and that sufficient machining accuracy can be ensured.

According to the scroll type fluid machine according to claim 2 or 3, a reinforcing plate such as a sliding plate and a thrust plate is fixed to the other side of the end plate of the scroll member on one side, and Since a reinforcing plate such as a scroll cover is fixed to the other surface side, in addition to achieving the above-mentioned first effect, the second effect of ensuring sufficient strength can be obtained.

According to the scroll type fluid machine according to claim 4 or 5, sealing members such as a sliding plate and a thrust plate are attached to the entire area on the other surface of the end plate of one scroll member, so that the first In addition to achieving the above effect, a third effect is obtained in that the recess formed on the other side of the end plate is closed, the lubricant does not enter the recess, and the lubricant is prevented from dissipating. .

According to the scroll type fluid machine according to claim 6, holes of the same size are formed in the center portions of the end plates of both scroll members, and one side is used as a bearing hole, and the other side is used as a fluid passage port. Therefore, in addition to achieving the first effect described above, a fourth effect can be obtained in that members can be made common and manufacturing is further facilitated.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing a scroll-type fluid machine which is an embodiment of the present invention, FIGS. 2 and 3 are front and back views showing a fixed (orbiting) scroll member, respectively, and FIG. FIG. 3 is a sectional view taken along the line IV-rV, FIG. 5A and FIG. 5B are sectional views for explaining the operation of the scroll-type fluid machine of the above embodiment, respectively, and FIG. 6 shows a conventional scroll-type fluid machine. FIG. 30... Fixed scroll member, 31... End plate, 3
2... Through hole, 39... Spiral piece, 4
0... Orbiting scroll member, 41... End plate, 42
...Through hole, 49...Spiral piece 53...
Sliding plate, 55...Thrust plate, 64...Scroll cover

Claims (1)

[Scope of Claims] (1) In a pair of scroll members each having a spiral piece protruding from one side of the end plate, the scroll members on one side are engaged with each other, and the scroll member on one side is connected to the scroll member on the other side. In a scroll-type fluid machine that orbits with respect to a scroll member so as not to apparently rotate, each of the pair of scroll members is formed of a molded body, and at least the end plates of the pair of scroll members are made of substantially the same shape as each other. A scroll-type fluid machine characterized by its finished shape and dimensions. (2) The scroll type fluid machine according to claim 1, wherein a reinforcing plate is fixed to the other side of each end plate of the pair of scroll members. (3) The reinforcing plate attached to the end plate of the scroll member on one side is composed of a thrust plate and a sliding plate, and the reinforcing plate attached to the end plate of the scroll member on the other side is configured to 3. The scroll type fluid machine according to claim 2, comprising a cover. (4) The scroll-type fluid machine according to claim 1, wherein the entire other surface of the end plate of the one scroll member is covered with a sealing member. (5) The scroll type fluid machine according to claim 4, wherein the sealing member includes a thrust plate arranged on the outer periphery of the other surface of the end plate, and a sliding plate arranged on the inner periphery of the other surface. . (8) A hole of the same size is formed in the center of each end plate of the pair of scroll members, and the hole formed on the one side of the scroll member among the holes is an eccentric shaft for rotational drive. 2. The scroll-type fluid machine according to claim 1, wherein the hole formed on the other side of the scroll member is used as a bearing hole for holding the scroll member, and the hole formed on the other side of the scroll member is finished as a fluid passage port.