JP2002357189A - Scroll type compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive scroll type compressor by reducing a cost of each scroll member. SOLUTION: In an inner peripheral side part of a spiral wall element 101b, chamfering (m) is formed in both of a front side and a back side. In an outer peripheral side part, the chamfering (m) is formed only in the back side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the shape of each scroll member of a scroll compressor provided in an air conditioner, a refrigeration system, or the like.

[0002]

2. Description of the Related Art FIGS. 6A and 6B show a fixed scroll member 1 which is a main component of a conventional scroll compressor.
And an example of the orbiting scroll member 2 are shown. The fixed scroll member 1 includes a fixed end plate 1a and a spiral wall 1b, and the orbiting scroll member 2 includes a orbiting end plate 2a.
And a spiral wall 2b. The spiral members 1b and 2b of the scroll members 1 and 2 are arranged in combination with a phase shift of 180 °, and the orbiting scroll member 2 is revolved orbitally with respect to the fixed scroll member 1 so that each of the scroll members 1b and 2b revolves. The volume of the compression chamber formed between the spiral wall bodies 1b and 2b is gradually reduced, and the fluid in the compression chamber is compressed, and finally from the discharge port 3 installed at the center of the fixed end plate 1a. It is configured to discharge the high-pressure compressed fluid.

[0003]

By the way, in the conventional scroll type compressor described above, each spiral wall 1
Each of the tips b and 2b is chamfered on both the back side and the abdomen side over the entire circumference of the spiral from the beginning of the center of the spiral to the end of the outer periphery of the spiral. That is, FIG.
In the fixed scroll member 1 shown in FIG.
b, both the shoulders 1b2 and 1b3 of the spiral surface 1b1 (tip) that is in sliding contact with the end plate 2a are chamfered. In addition, the chamfering is continuously performed over the entire circumference (full length) from the start end to the end. Similarly, in the orbiting scroll member 2 shown in FIG. 6B, both the shoulders 2b2 and 2b3 of the spiral wall 2b of the spiral surface 2b1 (tip) that slides on the end plate 1a are chamfered. It has been done. The chamfering is continuously performed over the entire circumference (full length) from the start end to the end.

[0004] These chamfers are indispensable for ensuring a smooth orbiting operation of the orbiting scroll member 2 with respect to the fixed scroll member 1, but they are formed over the entire circumference (total length) of the complicated spiral wall and at both corners thereof. Since processing is performed, there is a problem that the cost is inevitably higher than when a simple rectangular shape is left.

The present invention has been made in view of the above circumstances, and has as its object to provide an inexpensive scroll compressor by reducing the cost of each scroll member.

[0006]

The present invention employs the following means in order to solve the above-mentioned problems. That is, the scroll type compressor according to claim 1 has a spiral wall body erected on one side surface of an end plate, and a fixed scroll member fixed at a fixed position and one side surface of another end plate. And a revolving scroll member supported by the revolving scroll member, the other revolving wall member being erected on the rotatable member, the revolving revolving motion being supported while engaging the respective spiral wall members to prevent rotation. A chamfer is formed on both the abdominal side and the dorsal side of the inner peripheral portion of each of the spiral wall bodies, and a chamfer is formed only on the dorsal side of the outer peripheral portion of each of the spiral wall bodies. It is characterized by.

[0007] According to the scroll type compressor of the first aspect, the spiral wall is opposed to the inner peripheral portion where the temperature of the compressed gas is relatively high, because the tooth height of the spiral wall linearly expands. Although it comes into contact with the sliding contact surface of the end plate, since both back and abdominal shoulders are chamfered, even if the spiral wall slides in any direction with respect to the sliding contact surface. ,
It is possible to prevent the risk of abrasion, seizure, and power loss between them. In addition, since the orbiting scroll member falls down during the revolving orbiting motion, the outer peripheral portion that comes into contact with the sliding contact surface of the end plate that is facing is chamfered mainly on the back side that comes into contact. It is possible to prevent the risk of wear, seizure and power loss between them. Furthermore, in the outer peripheral side portion, even if the orbiting scroll member falls down, chamfering is not performed on the abdominal side where it does not contact, so that the processing cost of each scroll member can be reduced.

[0008] The scroll type compressor according to claim 2 is
2. The scroll type compressor according to claim 1, wherein the chamfer of the outer peripheral portion is formed at least one or more rounds inward from the outer peripheral end of each of the spiral wall bodies. According to the scroll type compressor according to the second aspect, each spiral wall body is covered with a chamfer without leakage around its tooth tip. Even if it falls down in the direction, the part without the chamfer does not slide on the opposing sliding contact surface, and can always slide with the chamfered part in surface contact.

According to a third aspect of the present invention, in the scroll type compressor according to the second aspect, the chamfer of the inner peripheral side portion is at least outward from the inner peripheral end of each of the spiral wall bodies. It is characterized in that it is formed up to one or more turns. According to the scroll type compressor according to the third aspect, of the entire circumference of the spiral wall body, a portion where the blade length is relatively easily extended by heat input from the compressed gas, from the inner peripheral end toward the outer side. By chamfering both shoulders (both on the back side and on the abdomen side) of the portion up to one or more rounds, each spiral wall and the sliding surface of the end plate facing the spiral wall are formed. Risk of wear, seizure and power loss between
The prevention can be more reliably achieved.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the scroll compressor according to the present invention will be described below with reference to the drawings. . FIG. 1 is a cross-sectional view showing the overall configuration of the scroll compressor of the present embodiment. FIG. 2 is a front view when the fixed scroll member of the scroll compressor is viewed from the spiral wall side. FIG. 3 is a front view of the orbiting scroll member of the scroll type compressor when viewed from the spiral wall side. FIG. 4 is a view showing a sliding contact portion between an inner peripheral side portion of a spiral wall body of the scroll type compressor and a sliding contact surface of an end plate opposed thereto. AA in FIG.
It is a sectional enlarged view. FIG. 5 shows a sliding contact portion between the outer peripheral side portion of the spiral wall body of the scroll type compressor and a sliding contact surface of an end plate opposed thereto, and FIG. It is a B section enlarged view, (a) has shown before orbiting scroll member falling down, (b) has shown the orbiting scroll member falling state.

As shown in FIG. 1, a scroll type compressor according to the present embodiment comprises a housing 100 and a housing 10.
0, a revolving scroll member 102 rotatably supported in the housing 100, and a fixed scroll member 101 fixed to the opening end side of the housing 100 to support the thrust force of the revolving scroll member 102. It has a schematic configuration including a front case 105 (cover plate) and a shaft 103 that rotationally drives the orbiting scroll member 102.

The shaft 103 is provided with a crank pin 103a having an axis b eccentric with respect to the axis a of the shaft 103, and the crank pin 103a is moved with respect to a boss 102c formed at the center position of the orbiting scroll member 102. Connected. The fixed scroll member 101 includes a fixed end plate 101a (end plate) and a spiral wall body 101b erected on one side thereof.
Numeral 02 is composed of a swirling end plate 102a (end plate) and a spiral wall 102b erected on one side thereof.

The scroll members 101, 1
02 of the two spiral wall bodies 101b and 102b are 180
The phase is shifted and combined, and the orbiting scroll member 102 is revolved and orbited through the shaft 103 with respect to the fixed scroll member 101, so that the compression chamber C formed between the spiral wall bodies 101b and 102b is formed. Is gradually reduced, the fluid in the compression chamber C is compressed, and finally the high-pressure fluid is discharged from the discharge port 104 provided at the center of the fixed end plate 101a. I have. Further, between the spiral wall body 102b and the fixed end plate 101a, and between the spiral wall body 101b and the fixed end plate 102a.
A tip clearance (not shown) for ensuring a smooth revolving motion of the orbiting scroll member 102 with respect to the fixed scroll member 101 is formed in each of the areas a. The points described above are the same as those of the conventional scroll compressor.

As shown in FIGS. 2 and 3, the scroll type compressor of this embodiment has
In the inner peripheral side portions of b and 102b, chamfers m are formed on both the ventral side and the dorsal side, and each of the spiral wall bodies 101b and 102b is formed.
Is characterized in that the chamfer m is formed only on the back side in the outer peripheral side portion of. In the present invention, the “ventral side” refers to each of the spiral wall bodies 101b and 102b.
Of the inner peripheral surface n facing the center of the spiral, and the term "back" refers to the outer peripheral surface g corresponding to the back surface of the abdomen. That is, each of the spiral wall bodies 101b and 102b
If the abdominal side of the spiral wall is chamfered, both shoulders of the spiral wall bodies 101b and 102b (the spiral wall bodies 101b and
Of the tooth tip 102b in a cross section perpendicular to the extending direction of the tooth tip 102b) indicates that the corner on the inner peripheral surface n side is chamfered. Conversely, when the chamfer m is formed on the back side of each of the spiral wall bodies 101b and 102b, the corners on the outer peripheral surface g side of the shoulder portions of the spiral wall bodies 101b and 102b are provided. Indicates that chamfering m has been performed.

Further, the "inner peripheral portion" referred to in the present invention refers to the inner peripheral end s of the spiral center when each of the spiral wall bodies 101b and 102b is viewed from the opposite side as shown in FIGS. As a starting point, 1 turn to 1.5 turns (1
(Up to 1.5 turns). The “outer peripheral side portion” referred to in the present invention means that at least one or more turns toward the inner peripheral side of the spiral from the outer peripheral end e of the spiral when the spiral wall bodies 101b and 102b are viewed in opposition. It indicates the range up to the winding position (one or more rounds).

That is, each spiral wall 10 of this embodiment is
As shown in FIG. 2 to FIG. 4, 1b and 102b each include one turn from the inner peripheral end s of the center of the spiral toward the outer periphery of the spiral.
In the 1.5-turn inner peripheral side portion, chamfers m are machined on the back side and the abdomen side, respectively, and the plane excluding these chamfers m comes into sliding contact with the opposed turning end plate 102a and fixed end plate 101a. It is a sliding contact surface y. Further, as shown in FIGS. 2, 3 and 5A, each of the spiral wall bodies 101b and 102b of the present embodiment has at least one or more turns from the outer peripheral end e of the spiral toward the center of the spiral. Is chamfered only on the back side, and the belly side remains angular without chamfering. And
The plane excluding the chamfer m on the back side is the opposite turning end plate 10.
2a, the sliding contact surface y slidingly contacting the fixed end plate 101a
It has become.

When the scroll-type compressor having the above-described configuration is operated, the fluid that is taken into the compression chamber C formed between the fixed scroll member 101 and the orbiting scroll member 102 and undergoes compression toward the center of the spiral is Since the temperature gradually rises due to the compression action, thermal expansion of the spiral wall bodies 101b and 102b tends to occur in the inner peripheral portion where the temperature becomes relatively high. Thereby, each spiral wall body 101
b, 102b are linearly expanded in the α direction (parallel to the axis a) shown in FIG. 4 and the tooth height is extended, so that they come into strong contact with the end plates 102a, 101a facing each other (FIG. 4). , Before contact). When the orbiting scroll member 102 is caused to perform the orbital operation indicated by the reference symbol β in this contact state, if the orbiting scroll member 102 has an angular shape having no chamfered m at both corners, these abut against the sliding contact surfaces of the end plates 101a and 102a, causing wear and tear. Cause seizure, or
Power loss may occur. However, in each of the spiral wall bodies 101b and 102b of the present embodiment, since the chamfer m is applied to both the back side and the abdomen side of the inner peripheral side portion, the above-described problem can be avoided.

In the revolving operation of the orbiting scroll member 102, the tip clearance exists between the spiral wall bodies 101b and 102b and the end plates 102a and 101a. The lateral gas force Fg due to the gas pressure and the scroll driving force Fd by the crank pin 103a act, and the orbiting scroll member 102 falls over (the orbiting scroll member 102).
(A slight inclination of the tip clearance), and the tip actually falls over as much as the tip clearance allows. At this time, the transverse gas force Fg
Is caused by the fluid pressure in the compression chamber C.
The scroll driving force Fd is a force that causes the crankpin 103a rotating around the axis a to move away from the boss 102b.
This is the rotational driving force applied to c.

As described above, when the orbiting scroll member 102 is overturned, the spiral wall 102
5B also falls in the sign γ direction as shown in FIG. 5B, and in this inclined state, the chamfered portion m comes into sliding contact with the opposed fixed end plate 101a by surface contact (similarly, The chamfer m of the spiral wall 101b is also changed
2a).

In this case, if each spiral wall 101b,
If the shoulder on the back side of 102b has a square shape without chamfer m, these may hit the sliding contact surfaces of the end plates 101a and 102a, causing abrasion, seizure, or power loss. However, in the spiral wall bodies 101b and 102b of the present embodiment, since the chamfer m is formed on the back side of the outer peripheral side portion, the above-described problem can be avoided. Moreover, since the chamfer m is provided only on the back side which is actually in sliding contact, instead of providing the chamfer m on both the back side and the abdomen side as in the conventional case, the chamfering processing on the abdomen side is unnecessary, and the processing cost is reduced. Is achievable. That is, since it takes time and labor to accurately perform an appropriate chamfering process on a complicated spiral wall, it is possible to reduce the chamfering process of a portion that does not actually need to be chamfered. The compressor has succeeded in reducing the cost.

As described above, the scroll-type compressor according to the present embodiment forms the chamfer m on both the abdominal side and the back side at the inner peripheral side of each of the spiral wall bodies 101b and 102b, and forms the outer peripheral side. In the part, a configuration in which the chamfer m was formed only on the back side was adopted. According to this configuration, unlike the related art, it is not necessary to perform chamfering on the entire circumference of both the abdominal side and the back side of each of the spiral wall bodies 101b and 102b, so that the processing cost of each of the scroll members 101 and 102 can be reduced. Thus, an inexpensive scroll compressor can be provided.

Further, in the scroll type compressor according to the present embodiment, the chamfer m of the outer peripheral side portion is changed to each of the spiral wall bodies 101b,
A configuration was adopted in which at least one round or more was formed inward from the outer peripheral end e of 102b. According to this configuration, regardless of the direction in which the orbiting scroll member 102 falls during the orbital orbiting motion, each of the spiral wall bodies 101b, 1b.
02b, the end plate 102 opposing at any one point in the outer peripheral portion of one or more chamfered portions forming the outer periphery of the tip end
The sliding contact surfaces a and 101a come into sliding contact with each other by surface contact. Therefore, it is possible to more reliably prevent abrasion, burning or power loss between the end plates 102a, 101a facing the spiral wall bodies 101b, 102b.

Further, in the scroll type compressor of the present embodiment, the chamfer m of the inner peripheral side portion is changed to each of the spiral wall bodies 101b,
A configuration was adopted in which at least one round or more was formed outward from the inner peripheral end s of the 102b. According to this configuration, the edge length of the inner peripheral portion linearly expands and the end plate
When sliding with respect to the sliding contact surfaces 2a, 101a, the spiral wall bodies 101b, 102
Even if b slides, it is possible to more reliably prevent wear, seizure, and power loss between them.

In this embodiment, the case where the fixed scroll member 101 and the orbiting scroll member 102 are stepless scroll compressors having no steps has been described as an example. However, the present invention is not limited to this. Needless to say, the present invention may be applied to a scroll compressor of the type.

[0025]

According to the scroll compressor of the first aspect of the present invention, the inner peripheral portion of each spiral wall has chamfers on both the abdominal side and the back side, and the outer peripheral portion has chamfers. A configuration in which the chamfer is formed only on the back side is adopted. According to this configuration,
Unlike the conventional case, it is not necessary to perform chamfering on the entire circumference of both the abdominal side and the back side of each spiral wall body, so that the processing cost of each scroll member can be reduced, and an inexpensive scroll type compressor can be manufactured. Can be provided.

Further, the scroll type compressor according to the second aspect of the invention employs a configuration in which the chamfer of the outer peripheral side portion is formed from the outer peripheral end of each spiral wall to at least one inward position. According to this configuration, no matter in which direction the orbiting scroll member falls during the revolving orbiting motion, at any one point of one or more chamfered outer peripheral portions forming the outer periphery of the tip of each spiral wall body. Then, the end plate comes into sliding contact with the sliding surface of the facing end plate by surface contact. Therefore, it is possible to more reliably prevent abrasion, burning and power loss between the end plates facing the spiral wall bodies.

Further, the scroll type compressor according to the third aspect employs a configuration in which the chamfer of the inner peripheral portion is formed at least one or more rounds from the inner peripheral end of each spiral wall to the outer side. did. According to this configuration, when the blade length of the inner peripheral side portion linearly expands and slides on the sliding contact surface of the end plate opposed thereto, the spiral wall body in any direction with respect to the sliding contact surface. Even if they slide, it is possible to more reliably prevent wear, seizure, and power loss between them.

[Brief description of the drawings]

FIG. 1 is a view showing one embodiment of a scroll compressor of the present invention, and is a cross-sectional view showing an entire configuration.

FIG. 2 is a front view when a fixed scroll member of the scroll compressor is viewed from the spiral wall side.

FIG. 3 is a front view of the orbiting scroll member of the scroll type compressor when viewed from the side of the spiral wall.

FIG. 4 is a view showing a sliding contact portion between an inner peripheral side portion of a spiral wall body of the scroll compressor and a sliding contact surface of an end plate opposed thereto; FIG. 3 is an enlarged cross-sectional view taken along line AA of FIG.

FIG. 5 is a sectional view taken along the line BB in FIGS. 2 and 3, showing a sliding contact portion between the outer peripheral side portion of the spiral wall body of the scroll type compressor and a sliding contact surface of an end plate opposed thereto; It is an enlarged view, (a)
Shows a state before the orbiting scroll member has fallen, and (b) shows a state where the orbiting scroll member has fallen.

FIG. 6 is a perspective view showing each scroll member of the conventional scroll compressor, wherein (a) shows a fixed scroll member and (b) shows a orbiting scroll member.

[Explanation of symbols]

 101: fixed scroll member 101a: fixed end plate (end plate) 101b: spiral wall member 102: turning scroll member 102a: turning end plate (other end plate) 102b: Spiral wall (other spiral wall) e: outer peripheral end m: chamfer s: inner peripheral end

Claims (3)

[Claims] 1. A fixed scroll member fixed to a fixed position and having a spiral wall provided on one side of an end plate, and another spiral formed on one side of another end plate. A revolving scroll member having a wall body, the revolving scroll member being supported to be capable of revolving orbiting while being prevented from rotating by engaging the respective spiral wall bodies with each other. A scroll-type compression, wherein a chamfer is formed on both the abdominal side and the dorsal side on the circumferential side portion, and a chamfer is formed only on the dorsal side on the outer peripheral side portion of each of the spiral wall bodies. Machine. 2. The scroll-type compressor according to claim 1, wherein the chamfer of the outer peripheral portion is formed at least one or more rounds inward from the outer peripheral end of each of the spiral wall bodies. A scroll type compressor characterized by the following. 3. The scroll-type compressor according to claim 2, wherein the chamfer of the inner peripheral portion is formed to at least one or more turns from the inner peripheral end of each spiral wall body to the outer side. A scroll compressor.