JPH06159263A - Scroll compressor - Google Patents

Abstract

PURPOSE:To facilitate the assembly of a scroll compressor and to enhance the reliability by minimizing inclination and deformation of a frame shrinkage- fitted surface, a thrust surface and a reamered hole during press-fit fixing by a frame shrinkage-fitting, press-fitting or the like. CONSTITUTION:A stationary scroll 1 and a turnable scroll 2 having spiral parts formed on base plates which are combined with each other so as to define a compression chamber, and a frame 4 having a thrust surface 4g on which the stationary scroll 1 is positioned and fixed by means of a reamered hole 1c and the turnable scroll 2 is axially supported, and a shrinkage fitted surface which is fixed to a shell 5 by shrinkage-fitting, press fitting or the like at the outer peripheral part thereof. Further, the distance between the opening end face of the frame and the press-fitted seal surface is set between a maximum value at which the distance is smaller than the tolerable value for deformation and inclination of the reamered hole 1c on design, and a value at which the distance is smaller than a tolerable value for deformation of the thrust surface 4g on design.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor having a fixed scroll and an orbiting scroll, and more particularly to a scroll compressor having improved assembly accuracy.

[0002]

2. Description of the Related Art FIG. 4 is a vertical sectional view of a first conventional scroll compressor. In the figure, 1 is a base plate 1a and a spiral portion 1
b is a fixed scroll, 2 is a base plate 2a, and a spiral portion 2
The fixed scroll 1 and the orbiting scroll 2 are combined with each other to form a compression chamber 45. 3 is a fixed scroll 1
The discharge holes 4 provided in the base plate 1a of the
A frame having a thrust surface 4g for supporting the thrust direction force acting on the fixed scroll 1 which is positioned in the rotational direction by a reamer pin (not shown) or the like and fixedly arranged with bolts or the like, and 13 is the center of the frame 4. The main bearing located at the section, 6 is shared with the shaft of the motor rotor 8,
A crankshaft 5 rotatably supported by the main bearing 13 of the frame 4 is a shell for fixing the frame 4 by shrink fit at the upper end, and a shell for supporting the motor stator 9 in the middle part.
Reference numeral 1 denotes a subframe fixedly arranged at the lower end of the shell 5 and having a bearing 39 for supporting the lower end of the crankshaft 6 at the center thereof,
Reference numeral 12 is a base that seals the lower end of the shell 5 and is fixed to another member, and 20 is a discharge chamber provided on the back side of the fixed scroll 1. A lead wire connector 10 is connected to the electric motor stator 9 and supplies electric power. Also,
40 is a low pressure chamber, 41 is a high pressure chamber, the contact surface of the step portion 5a provided on the shell 5 and the step portion 4b provided on the frame 4, and the frame shrinkage step portion for fixing the shell 5 and the frame 4 to each other. The low-pressure chamber 40 and the high-pressure chamber 41 are separated by the outer peripheral portion 4a.

FIG. 5 is a partial sectional view of a second conventional scroll compressor disclosed in Japanese Patent Laid-Open No. 62-126205. In the figure, the same reference numerals and symbols as those of the conventional example indicate the same or corresponding components as those of the conventional example. In the figure, 401 is an orbiting scroll 2.
The thrust bearing 4d for supporting the thrust direction force, the main bearing 13, and the first frame having a reamed hole (not shown) for circumferentially positioning the fixed scroll 1;
The second frame 4 is fitted with the first frame 401 and fixedly arranged on the shell 5 by shrink fitting or the like.
03 is the outer periphery of the shrink fit of the second frame 402, 407
Is a relief portion provided on the first frame 401 side of the shrink fit outer peripheral portion 403 of the second frame 402.
Reference numeral 5 is a concave portion of the second frame 402, and 406 is an anchor portion of the second frame 402. The axial center of the shrink fit outer peripheral portion 403 is provided at a position away from the outer peripheral surface of the recess 405 of the second frame 402.

FIG. 6 is a sectional view of a third conventional rotary compressor shown in Japanese Patent Laid-Open No. 61-286597. In the drawing, the same reference numerals and symbols as those of the above-mentioned conventional examples indicate the same or corresponding components as those of the above-mentioned conventional examples. In the figure, reference numeral 404 is a cylinder block which is fixed to the inner wall of the cylindrical closed shell 5 by press fitting, shrink fitting, etc., forms a compression chamber in its center, and has a bearing for supporting the rotating shaft 6, It is positioned by a step portion 5a provided on the inner wall of the shell 5.

Next, the operation of the conventional rotary compressor will be described with reference to FIG. The crankshaft 6 driven by the electric motor rotor 8 fixed to the intermediate portion of the electric motor stator 9 fixed to the intermediate portion of the shell 5 has a bearing 13 of the frame 4.
The orbiting scroll 2 which is supported by the bearing 39 of the subframe 11 and rotates, and the bearing 2c of which is eccentrically supported on the upper portion of the crankshaft 6 revolves to move between the fixed scroll 1 and the orbiting scroll 2 in the compression chamber. 45 is formed. The low-pressure refrigerant gas in the low-pressure chamber 40 is sucked into the compression chamber 45 by the compression action of the fixed scroll 1 and the orbiting scroll 2, compressed into the high-pressure refrigerant gas, and then discharged into the high-pressure chamber 41 from the discharge port 3. It The low-pressure refrigerant gas in the low-pressure chamber 40 and the high-pressure refrigerant gas in the high-pressure chamber 41 are partitioned by the step portion 5a and the step portion 4b which are the sealing surfaces between the frame 4 and the shell 5, and the frame shrink-fit step portion outer peripheral portion 4a. Airtightness is maintained. Also, frame 4
With respect to the bearing 13 of the frame 4, the anchoring portion 4c is guaranteed in terms of concentricity, squareness, roundness and flatness due to machining accuracy. Further, the anchor portion 11a of the sub-frame 11 is coaxial with the bearing 39 of the sub-frame 11,
The squareness, the roundness and the flatness are guaranteed by the machining accuracy, and the parallelism, the flatness and the roundness of the inner peripheral surface of the shell 5 are also guaranteed by the machining accuracy. Therefore, the coaxiality and squareness of the bearing 13 of the frame 4 and the bearing 39 of the sub-frame 11 are ensured, and the crankshaft 6
Rotates smoothly between both bearings 13 and 39.

In the compression process, the thrust direction force acting on the orbiting scroll 2 is supported by the thrust bearing 4d provided on the frame 4. In order to minimize axial movement (fluttering) of the orbiting scroll 2 that performs the orbiting movement, the thrust surface 4g of the frame 4 has a flatness,
Also, the parallelism with respect to the frame upper end surface 4e is ensured by the machining accuracy. Further, the flatness of the side face of the compression chamber of the base plate 1a of the fixed scroll 1 is guaranteed by the machining accuracy. Therefore, the parallelism and flatness of the thrust surface 4g and the base plate 1a of the fixed scroll 1 are guaranteed during assembly. As a method of axially positioning the frame 4 and the shell 5, as shown in FIG. 6, the shell 5 is provided with a step portion 5a, and the frame 4 is fixedly arranged at the step portion 5a.

[0007]

The conventional scroll compressor is constructed as described above, and since the frame 4 is shrink-fitted in the shell 5 and fixed by the press-fitting fixing means such as press-fitting, the burn-in is performed. The frame 4 is deformed by a fit, a press fit, or the like. FIG. 7 and FIG. 8 show examples of frame deformation due to conventional shrink fitting. FIG. 7 is a schematic explanatory diagram showing frame deformation before and after frame shrink fitting by an example of a conventional scroll compressor, and FIG. 8 is a schematic diagram showing frame deformation before and after frame shrink fitting by another example of a conventional scroll compressor. FIG. As shown in FIG. 7, the frame 4
When press-fitting or shrink-fitting is performed at the upper end of the frame 4, the reamed hole 4f of the frame 4 has a large inclination, and the reamed hole cannot be inserted into the reamed hole 4f of the fixed scroll 1 when the reamer pin is inserted, or as shown in FIG. When press fitting or shrink fitting is performed at the lower end of the frame 4, the thrust surface 4g is greatly deformed, and the performance and reliability are deteriorated. Therefore, with the frame alone, even if the inclination of the reamed hole 4f for positioning the fixed scroll 1 in the rotational direction and the flatness and parallelism of the thrust surface 4g are ensured by the mechanical precision, the deformation of the frame 4 due to shrink fit or the like. As a result, the accuracy is deteriorated, the reliability is lowered, the performance is deteriorated, and further, there is a problem that the reamed hole 4f has a large inclination and cannot be assembled.

The shrink-fitted surface of the frame 4 has a high pressure chamber 4
Since 1 and the low-pressure chamber 40 are separated and sealed between them, if the shrink-fitted surface of the frame 4 is inclined and shrink-fitted by press-fitting, shrink-fitting, etc., the seal length becomes shorter, which is necessary. There has been a problem that a sufficient seal length cannot be obtained, gas leaks from the high pressure chamber 41 to the low pressure chamber 40, and performance and reliability are reduced. And frame 4
As to the deformation prevention of the thrust surface 4g provided in, the relief portion 407 is provided at the side end of the first frame 401 of the shrink fit outer peripheral portion 403 provided in the second frame 402, as shown in FIG. By providing the axial center of the shrink fit outer peripheral portion 403 at a position deviated from the outer peripheral surface of the concave portion 405 of the second frame 402, deformation of the anchor portion of the second frame 402 is prevented, and thereby fitting is performed. By reducing the deformation of the combined first frame 401, the deformation of the thrust surface 4g provided on the first frame 401 is prevented. In this case, structurally, the second frame 402
Although it is not necessary to seal the high pressure side and the low pressure side by the shrink fit outer peripheral portion 403 of the second frame 402, even if the shrink fit outer peripheral portion 403 of the second frame 402 is inclined.
If the deformation of the ingot part of 02 is small, and the shrink fit outer peripheral part 403 is inclined, the length of the shrink fit outer peripheral part 403 of the second frame 402 is shortened and a necessary and sufficient seal length can be obtained. Can not.

Therefore, the present invention has been made to solve the above-mentioned problems, and the amount of deformation of the thrust surface, the inclination of the reamed hole, and the shrink fit surface caused by press fit fixation such as shrink fit or press fit. It is an object of the present invention to provide a scroll compressor which has a small inclination as much as possible, high assemblability, high reliability, and high performance.

[0010]

A scroll compressor according to the present invention is mounted with a reamed hole for positioning a fixed scroll in a radial direction, and a thrust surface and a central portion for restricting axial movement of the orbiting scroll. A frame having a bearing on its outer periphery and a press-fitting and sticking seal surface fixed to the shell on its outer periphery, and the press-fitting and sticking seal surface separating the high-pressure chamber and the low-pressure chamber is a press-fit seal from the opening end surface of the frame. The distance to the surface is set between a minimum value that is less than or equal to the deformation allowable value of the reamed hole inclination in design and a value that is less than or equal to the deformation allowable value of the thrust surface in design. .

[0011]

According to the present invention, the distance from the opening end face of the frame to the press-fitting seal face is set to the minimum value which is equal to or less than the design allowable deformation value of the reamed hole inclination, and the design deformation degree of the thrust surface. By setting it between the minimum value that is less than or equal to the allowable value, the high pressure side and the low pressure side are sealed by the press-fitted fixing part such as shrink fit of the frame and shell, and the space between the frame upper end surface and the thrust surface is Since the reamer hole does not tilt even after press-fitting and fixing such as by shrink fitting and deforms in parallel, the deformation of the thrust surface of the frame is suppressed to a minimum, and the tilting of the reamer hole and the press-fitting fixing sealing surface is minimized. It can be made as small as possible.

[0012]

Embodiments of the present invention will be described below. FIG. 1 is a cross-sectional view of essential parts of a scroll compressor according to an embodiment of the present invention, and FIG. 2 is a frame compressor shrink fit position of a scroll compressor according to an embodiment of the present invention, an inclination of a reamed hole, and a degree of deformation of a thrust surface. It is a characteristic view showing the relationship of. FIG. 3 is a schematic explanatory view showing the deformation of the frame before and after the shrink fitting when the upper shrinkage is provided in the frame shrink fitting step portion according to the embodiment of the present invention. In the drawing, the same reference numerals and symbols as those of the above-mentioned conventional examples indicate the same or corresponding components as those of the above-mentioned conventional examples.

In FIG. 1, reference numeral 1c is a reamed hole provided in the fixed scroll 1. Further, 4a is an outer peripheral portion of the frame shrink-fitting step portion, 4b is a step portion serving as a positioning end of the shrink-fitting step portion provided on the frame 4, 4e is a frame upper end surface, and 4f.
Is a reamed hole provided in the frame 4, 5a is a step portion for shrink fit positioning provided as a sealing surface in the shell 5, and 15 is a reamer pin. Further, the distance L from the opening end of the frame 4, that is, the upper end to be opened, to the position of the shrink fit press-fitting fixed sealing surface, that is, the upper end of the frame shrink fit step portion outer peripheral portion 4a is L, and the distance L is changed. From the results of the experiment, it was confirmed that the deformation degree of the thrust surface 4g and the inclination of the reamed hole 4f change with the characteristics shown in FIG.

As can be seen from the characteristics of FIG. 2, if the shrink-fitting position of the frame 4 is set to the upper end side of the frame 4, the deformation of the thrust surface 4g is small but the reamed hole 4f is largely inclined, resulting in a large inclination. , Reamer pin 15 inserted there
Also tilts and cannot be fixed by being inserted into the reamed hole 1c provided in the fixed scroll 1, and the fixed scroll 1 cannot be assembled to the opening side of the frame 4. Further, when the position of the frame shrink fit step outer peripheral portion 4a is separated from the upper end surface of the frame 4 and the distance L is increased so as to be located near the thrust surface 4g, the inclination of the thrust surface 4g becomes large.

Therefore, the position of the outer peripheral portion 4a of the frame shrink-fitting step is between the upper end of the frame 4 and the thrust surface 4g, and the inclination of the reamed hole 4f and the deformation of the thrust surface 4g are both within the calculation allowable value. That is, the minimum value L1 of the distance L that is less than or equal to the allowable deformation value of the reamed hole inclination in design, and the value L2 of the distance L that is less than or equal to the allowable deformation value of the thrust surface 4g in design. In relation to, the distance L is between the minimum value L1 and the value L2 (L1-L2 = ΔL)
Set to be the area of.

As described above, in the scroll compressor of this embodiment, the fixed scroll 1 forming the compression chamber 45 between both spirals by combining the spiral parts 1b, 2b formed on the base plates 1a, 2a and the rocking motion. The scroll 2 and the fixed scroll 1 are mounted using a reamed hole 4f for positioning in the radial direction, and have a thrust surface 4g for restricting axial movement of the orbiting scroll 2 and a main bearing 13 in the central portion, and The frame 4 has an outer peripheral portion 4a of a frame shrink-fitting step portion fixed to the shell 5, and the frame 4 separates the high-pressure chamber 41 and the low-pressure chamber 40 by the outer peripheral portion 4a of the frame shrink-fitting step portion; A crankshaft 6 which is rotatably supported by the main bearing 13 provided on the motor shaft 8 and which transmits the rotational force of the electric motor rotor 8 to the orbiting scroll 2, and an electric motor stator 9.
A distance L from the opening end surface of the frame 4 to the outer peripheral portion 4a of the frame shrink-fitting step, and a distance L that is less than or equal to the allowable deformation value of the inclination of the reamed hole 4 in design. Minimum value L1 of the thrust surface 4 in design
The relationship with the value L2 of the distance L that is equal to or less than the allowable deformation degree of g is set to L1≤L≤L2.

The position of the outer peripheral portion 4a of the frame shrink-fitting step is set from the minimum value L1 of the distance L which is equal to or less than the allowable deformation value of the reamed hole inclination in the design to the thrust surface 4g in the design.
Of the value of the distance L that is less than the allowable deformation degree of
The change of the reamed hole 4f when it is set to L) results in the deformation as shown in FIG. Compared to the shape before shrink fitting, after shrink fitting, the shrink fitting position is set to the designed value of the thrust surface 4g from the minimum value L1 of the distance L that is equal to or less than the design allowable deformation value of the reamed hole inclination. By setting the range of the value L2 of the distance L to be less than the allowable deformation degree, the inclination of the reamed hole 4f is improved, and the reamed hole 4f is deformed so as to move in parallel to the axial direction. Similarly, for the shrink fit surface, the inclination of the shrink fit surface is
It transforms to move in parallel.

Therefore, by setting the pitch of the reamed holes 1c provided in the fixed scroll 1 smaller than the pitch of the reamed holes 4f of the frame 4 by the deformation degree portion in advance, even if the frame 4 is deformed by shrink fitting, The reamer pin 15 can be inserted and the fixed scroll 1 can be assembled while being positioned. Also, the high pressure chamber 40
Shrink-fitting step outer peripheral portion 4 for shutting off the low pressure chamber 41 and the low pressure chamber 41
Since a is deformed and shrink-fitted so as to move in parallel even if it is deformed by shrink-fitting, the frame shrink-fit press-fitted fixed sealing surface 4g is not inclined and the seal length is not shortened. Therefore, a predetermined seal length can be obtained. Further, since the shrink fit position is located above the thrust surface 4g, the deformation of the thrust surface 4g can be suppressed to a minimum.

By the way, the outer peripheral portion 4a of the frame shrink-fitting step portion, which is fixed to the shell 5 at the outer peripheral portion of the frame 4 for separating the high-pressure chamber 41 and the low-pressure chamber 40 of the above embodiment, is premised on press-fitting and fixing by shrink-fitting. However, when the present invention is carried out, the present invention is not limited to shrink-fitting, and it may be forcibly press-fitted and fixed by pressure. Therefore, the frame shrink-fitting step portion outer peripheral portion 4a fixed to the shell 5 in the case of implementing the present invention may be a press-fitting and sticking sealing surface that is press-fitted from the opening end surface of the frame 4, and is fixed and sealed.

Further, the distance L from the opening end face of the frame 4 to the press-fitting fixed seal face is the upper end of the frame shrink-fitting stepped portion outer peripheral portion 4a. In some cases, the center of the width of the frame shrink fit step outer peripheral portion 4a is adopted. However, as a normal flange portion that satisfies press-fitting, fixing, and sealing, a distance L at which the upper end portion of the frame shrink-fit stepped portion outer peripheral portion 4a is equal to or less than the allowable deformation value of the inclination of the reamed hole 4 in design. The influence that influences the minimum value L1 is large, and the influence that influences the value L2 of the distance L at which the lower end of the outer periphery 4a of the frame shrink fit step portion is less than or equal to the allowable deformation value of the thrust surface 4g in design. As a result, the distance can be calculated by the distance between the upper end portion, the lower end portion or the middle portion of the frame shrink fit step outer peripheral portion 4a.

[0021]

As described above, according to the scroll compressor of the present invention, the fixed scroll and the oscillating scroll which form the compression chamber by combining the spiral portions formed on the base plate with each other, and the fixed scroll by the reamed holes. In a scroll compressor including a frame having a thrust surface for positioning and fixing and supporting an orbiting scroll in an axial direction, and a sealing surface press-fitted and fixed to a shell by shrink fitting, press fitting or the like on an outer peripheral portion thereof , A distance L from the opening end surface of the frame to the press-fitting fixed sealing surface, a minimum value that is less than or equal to the design allowable value of the reamed hole inclination, and a value that is less than or equal to the design allowable value of the thrust surface deformation degree. It was set between and. Therefore, due to the press-fitting fixation between the frame upper end surface and the thrust surface, the press-fitting sticking seal surface becomes a position where the reamer hole is deformed in parallel without tilting. Since the reduction of the length can be eliminated and the deformation of the thrust surface and the inclination of the reamed hole can be minimized, it is possible to assemble, the high pressure chamber and the low pressure chamber are reliably sealed, and the performance and reliability are high. A compressor is obtained.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of a scroll compressor according to an embodiment of the present invention.

FIG. 2 is a characteristic diagram showing a relationship between a frame shrink fit position of a scroll compressor according to an embodiment of the present invention, an inclination of a reamed hole, and a degree of deformation of a thrust surface.

FIG. 3 is a schematic explanatory view showing frame deformation before and after shrink fitting when a frame shrink fitting step portion is provided with an upper end relief according to an embodiment of the present invention.

FIG. 4 is a sectional view showing a first conventional scroll compressor.

FIG. 5 is a partial cross-sectional view of a second conventional scroll compressor.

FIG. 6 is a sectional view of a third conventional rotary compressor.

FIG. 7 is a schematic explanatory diagram showing frame deformation before and after frame shrink fitting by an example of a conventional scroll compressor.

FIG. 8 is a schematic explanatory diagram showing frame deformation before and after frame shrink fitting by another example of the conventional scroll compressor.

[Explanation of symbols]

1 Fixed scroll 1c Reamer hole 2 Oscillating scroll 4 Frame 4e Frame upper end surface 4f Reamer hole 4g Thrust surface 5 Shell 15 Reamer pin L Distance from the opening end surface of the frame to the press-fitted sticky seal surface L1 Deformation degree of the reamed hole inclination in the design Minimum value of distance L below allowable value L2 Value of distance L below allowable deformation degree of thrust surface in design

Claims (1)

[Claims] 1. A fixed scroll and an orbiting scroll that form a compression chamber between both spirals by combining spiral parts formed on a base plate, and a reamed hole that positions the fixed scroll in a radial direction. A thrust surface for restricting axial movement of the orbiting scroll and a bearing in the central portion, and a press-fitting and sticking seal surface fixed to the shell on the outer peripheral portion thereof, the press-fitting and sticking seal surface is used for the high-pressure chamber. And a frame for separating the low-pressure chamber, a crank shaft that is rotatably supported by bearings of the frame and that transmits the rotational force of the electric motor rotor to the orbiting scroll, and a shell to which the electric motor stator is fixed. In the compressor, the distance from the opening end face of the frame to the press-fitting fixed seal face is set to the maximum allowable value of the deformation degree of the reamed hole inclination in design or less. Value and, the scroll compressor being characterized in that set between the deformation degree allowable value or less become the value of the thrust surface of the design.