JPH0615804B2 - Scroll type fluid machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a scroll type fluid machine used for a compressor, a vacuum pump or the like, and more particularly to a sealing measure between a wrap and an end plate.

(Prior Art) Conventionally, there is one such as disclosed in Japanese Patent Application Laid-Open No. 58-192901 regarding the sealing property between the tip end surface of the wrap and the end surface of the end plate facing the wrap in the scroll type fluid machine. That is, as shown in FIG. 3, a fixed scroll 103 is installed inside the lid 102 coupled to the housing 101 so as to be movable only in the axial direction with respect to the lid 102. The orbiting scrolls 104 supported by the casing 101 are arranged to face each other. Then, in the scrolls 103 and 104, the spiral wraps 103a and 104a are respectively attached to the end plates 103b and 103b.
The wraps 1 formed on the front surface of the b
03a and 104a are meshed with each other.

Further, the orbiting scroll 104 is supported by inserting a shaft portion into an eccentric position of a rotating shaft 105 rotatably supported by the housing 101. Then, the orbiting scroll 104
Is configured to rotate only by the rotation of the rotating shaft 105 without rotating by an unillustrated rotation preventing mechanism.

Further, in FIG. 3, 106 and 107 are the end faces of the wraps 103a and 104a of the fixed scroll 103 and the orbiting scroll 104 and the end plates 103b and 1b.
04b is a plate-shaped member interposed between the plate-shaped members 106 and 107 and the wraps 10a and 10b, as shown in FIG.
3a, 104a through the spiral through groove 106a,
107a is formed. On both side surfaces of the through grooves 106a and 107a in the plate-like bodies 106 and 107, the concave groove 1 is formed.
06b and 107b are formed, and the concave grooves 106b and 107 are formed.
A seal member 108 is provided at b to seal between the wraps 103a and 104a. Further, between the plate-like bodies 106 and 107 and the end plates 103b and 104b of the fixed scroll 103 and the orbiting scroll 104,
An appropriate number of springs 109 are interposed and the plate-shaped body 10
6, 107 are always urged in a direction away from the end plates 103b, 104b.

(Problems to be Solved by the Invention) In the above-described conventional technique, each lap 103a, 10
4a and the end plates 103b, 104b between the plate-like body 106,
Although 107 is interposed, there is a problem that it is extremely difficult to perform a leak preventing process between the plate-shaped bodies 106 and 107 and the laps 103a and 104a. That is, the concave grooves 106b and 107 are formed on both side surfaces of the spiral through grooves 106a and 107a.
b, and the concave grooves 106b and 107 are formed.
Processing of b was extremely difficult.

Moreover, as shown in FIG. 4, the through grooves 106a, 10
In 7a, a groove-shaped space C is formed between the wraps 103a and 104a and the sealing material 108. The groove-shaped space C communicates from the high-pressure central portion (discharge port) to the low-pressure peripheral portion (suction port) through the lap meshing chamber, which is a major cause of performance degradation. It was. Further, when the sealing material 108 is not provided, the low pressure side and the high pressure side are communicated with each other by the space portion on the back surface of the plate-like bodies 106 and 107, which causes the performance deterioration similarly to the groove-like space C described above. It is a thing.

The present invention has been made in view of the above points, and it is an object of the present invention to facilitate the processing of a plate-like body and prevent performance deterioration.

(Means for Solving the Problems) In order to achieve the above object, the means grooved by the present invention are:
First, a fixed scroll in which a spiral wrap is erected on the front surface of the end plate, and a revolving scroll in which a spiral wrap is erected on the front surface of the end plate are arranged side by side by engaging the both wraps, It is premised on a scroll type fluid machine in which the orbiting scroll is revolved around the fixed scroll without rotating.

A spiral seal member made of an elastic material is provided on the tooth bottom surface of the end face of at least one scroll along the wrap and in close contact with the root side surface of the wrap. Further, a spiral groove is formed on the front surface of the seal member. In addition, in the groove of the seal member, a plate-like body made of a lubricating material having a spiral-shaped through-groove through which the wrap penetrates is formed, and the plate-like body rear surface and the side surface of the through-groove are covered with the seal member. In such a manner that the front end faces of the wraps facing each other are in sliding contact with the front surface of the plate-shaped body.

(Operation) With the above configuration, in the present invention, the seal member and the plate-like body can be assembled only by mounting them between the wraps, and it is necessary to form the concave groove on the side surface of the through groove as in the conventional case. Therefore, the workability of the plate-shaped body is improved. Further, the plate-like body is constantly pushed toward the tip of the wrap by the elastic force of the seal member, and even if the lap length is extended by thermal expansion, the extension of the wrap is caused by the elasticity of the seal member. Further, since the seal member closes the space between the side surface of the through groove and the wrap in the plate-shaped body, the communication groove of the groove-shaped space C unlike the conventional case is not formed. The fluid does not leak from the lap meshing chamber.

(Example) Hereinafter, the Example of this invention is described in detail based on drawing.

As shown in FIGS. 1 and 2, 1 is a fixed scroll in a scroll type fluid machine applied to a compressor, and the fixed scroll 1 also serves as a lid and an intermediate body 2.
Is connected to the housing 3 via. A rotary shaft 5 is supported by a bearing 4 on the housing 3, and the upper end of the rotary shaft 5 is
A crankshaft 5a is provided so as to be eccentric from the axis of the rotary shaft 5, and an orbiting scroll 7 is fitted on the crankshaft 5a via a bearing 6 so as to be movable in the axial direction. The scrolls 1 and 7 have spiral wraps 1a and 1a, respectively.
7a is formed upright on the front surfaces of the end plates 1b and 7b, and both laps 1a and 7a are meshed with each other.

The lower surface of the end plate 7b of the orbiting scroll 7, that is,
An unlubricated seal material 8 is fixed to the back surface, and the unlubricated seal material 8 forms a seal portion between the end plate 7b and the horizontal wall 2a of the intermediate body 2. Further, between the peripheral end of the end plate 7b of the orbiting scroll 7 and the fixed scroll 1, pin cranks 9 for preventing rotation are provided at a plurality of positions, and the orbiting scroll 7 rotates the rotating shaft 5. Thus, the fixed scroll 1 is only revolved around the pin crank 9 without rotating on its axis.

In FIG. 1 and FIG. 2, 10 and 11 are an upper plate-shaped member and a lower plate-shaped member made of a lubricating material, and each plate-shaped member 10, 11 corresponds to each lap 1a, 7a. A spiral through groove 20 is formed through which the laps 1a and 7a penetrate, and is located between the respective end plates 1b and 7b and the end faces of the wraps 1a and 7a facing the end plates 1b and 7b. Each end plate 1b, so that the tip surfaces of the laps 1a, 7a are in sliding contact with each other.
It is provided on the tooth bottom surface on the front surface of 7b.

Further, spiral seal members 12 and 13 made of an elastic material are provided between the plate-shaped bodies 10 and 11 and the tooth bottom surfaces on the front surfaces of the end plates 1b and 7b. The seal members 12 and 13 are fitted along the wraps 1a and 7a and closely to the root side surfaces of the wraps 1a and 7a.
Furthermore, spiral grooves 21 are formed on the front surfaces of the seal members 12 and 13. Then, the seal member 12,
The plate-shaped bodies 10 and 11 are fitted into the recessed grooves 21 of 13, and the back surfaces of the plate-shaped bodies 10 and 11 and both side surfaces of the through-groove 20 in the plate-shaped bodies 10 and 11 are sealed members 12 and 13. Is covered.

Further, the upper plate-shaped body 10 and the seal member 12 are provided with through holes 10a and 12a in the center thereof so that the discharge port 1c and the central lap engagement chamber can communicate with each other.

In addition, 14 is a balance weight and 15 is a bearing retainer.

Next, the compression action of the scroll type fluid machine will be described.

First, when the rotating shaft 5 is rotated, the orbiting scroll 7 revolves around the fixed scroll 1 without rotating due to the rotation of the rotating shaft 5, and is sucked from a suction port provided on the outer periphery of the orbiting scroll 7 (not shown). The fluid is each wrap 1a,
It flows into the lap meshing chamber due to the engagement of 7a, is compressed by the contraction of the lap meshing chamber, reaches the central portion, and becomes a high-pressure fluid, which is discharged from the discharge port 1c.

At the time of this compression operation, the plate-shaped bodies 10 and 11 are provided via the seal members 12 and 13 between the tip surfaces of the wraps 1a and 7a and the end plates 1b and 7b facing the tip surfaces. Therefore, the tooth bottom surface in each lap meshing chamber and the tooth bottom surface in the adjacent lap meshing chamber are blocked, and the fluid leakage from the tip surfaces of the laps 1a and 7a is reliably prevented.

Further, by continuing the compression action, the temperature gradually rises, and both laps 1a and 7a slightly expand. At this time,
Only the sealing members 12, 13 having a cushioning force are compressed through the plate-shaped bodies 10, 11, and the sealing members 12,
The cushioning force of 13 absorbs the extension of wraps 1a and 7a,
The leakage of fluid from the tip surfaces of the wraps 1a and 7a is still prevented, and the frictional force between the tip surfaces of the laps 1a and 7a and the plate-like bodies 10 and 11 is alleviated.

Although the upper plate 10 and the lower plate 11 and the seal members 12 and 13 are provided in the present embodiment, in the present invention, only the fixed scroll 1 side or the orbiting scroll 7 side is provided. You may make it provide a plate-shaped body and a sealing member.

Further, although the scroll type fluid machine is used as the compressor in the present embodiment, the present invention may be applied to various scroll type fluid machines such as a vacuum pump and an expander.

(Effects of the Invention) As described above, according to the present invention, the plate-like member is located between the tip surface of the wrap and the tooth bottom surface on the front surface of the end plate, and the back surface and the side surface of the through groove are covered with the seal member. Since the body is provided, it is possible to reliably prevent a gap from being formed on the tip end surface side of the wrap. As a result, it is possible to reliably prevent the fluid from leaking, so that the performance can be improved.

Further, since the seal member made of the elastic material is provided, it is possible to always prevent a gap between the tip surface of the lap and the end plate facing the tip surface regardless of whether or not the temperature rises. As described above, it is not necessary to provide an extra gap at the tip of the wrap at the time of assembly, pressure leakage can be reliably prevented, and performance can be further improved.

In addition, since the sliding frictional force between the tip surface of the wrap and the plate-shaped body can be alleviated by the seal member made of an elastic material, coating of the wrap and the like can be eliminated, and the productivity of each scroll can be improved. Since it can be improved, the cost can be reduced and the reliability can be improved.

Furthermore, since the plate-like body is fixedly supported by the seal member, the plate-like body does not rattle when the orbiting scroll turns, and it is possible to prevent interference between the plate-like body and the wrap. As a result, it is possible to prevent the generation of vibration and noise, and also to prevent the burr at the edge portion of the through groove due to the interference between the plate-shaped body and the wrap, thereby preventing seizure of the wrap and improving reliability. Can be improved.

Moreover, unlike the conventional case, it is not necessary to form the concave groove on the side surface of the through groove, so that the plate-shaped body can be easily processed.

[Brief description of drawings]

1 and 2 show an embodiment of the present invention. FIG. 1 is a vertical sectional view of a scroll type fluid machine, and FIG.
It is an expanded sectional view of the A section in a figure. 3 and 4 show a conventional example, FIG. 3 is a vertical sectional view of a scroll type fluid machine, and FIG. 4 is an enlarged sectional view of a B portion in FIG. 1 ... Fixed scroll, 1a, 7a ... Wrap, 1b,
7b ... End plate, 7 ... Orbiting scroll, 10 ... Upper plate, 11 ... Lower plate, 12, 13 ... Seal member, 20 ... Through groove, 21 ... Recessed groove.

Front page continuation (72) Inventor Nobukatsu Arai 502 Jinritsu-machi, Institute of Mechanical Engineering, Tsuchiura-shi, Ibaraki Pref., Institute of Mechanical Research, Inc. (56) References Japanese Patent Publication Sho 58-23516 (JP, B1)

Claims (1)

[Claims] 1. A fixed scroll in which a spiral wrap is erected on the front surface of an end plate and a revolving scroll in which a spiral wrap is erected on the front surface of an end plate are arranged in parallel with each other by meshing the both wraps. In a scroll type fluid machine which is installed and revolves with respect to a fixed scroll without revolving around itself, a spiral seal member made of an elastic material is provided on the tooth bottom surface of the end face of at least one scroll. A spiral groove is formed on the front surface of the sealing member along the wrap and in close contact with the root side surface of the wrap, while a spiral through which the wrap penetrates is formed in the groove of the sealing member. A plate-shaped body made of a lubricating material having a through-groove formed in a shape is provided such that the back surface of the plate-shaped body and the side surface of the through-groove are covered with the sealing member and the tip end surfaces of the wraps facing each other are the front surface of the plate-shaped body. Scroll type fluid machine, characterized in that provided in contact.