KR930005077B1 - Scroll compressor - Google Patents

Abstract

The scroll compressor forms a closed clearance by rotating one spiral lap with radius r to another spiral lap. The rotation angle of basic curve determining the start point of involute curve is 0≰. The inner involute curve with radius R at the middle part of spiral lap is smoothly contact with the circular arc with radius C at the start part of spiral lap. A function to calculate the rotation angle of basic circle determining a point on the involute curve to contact the outer involute curve with the circular arc with radius C smoothly is derived.

Description

Scroll compressor

1 is an exemplary perspective view of a spiral wrap for use in the scroll compressor of the present invention.

2 is a cross-sectional view taken along line A-A 'in a state where the fixed spiral wrap and the idle spiral wrap used in the scroll compressor of the present invention overlap.

3 is a functional diagram showing a spiral wrap of a first embodiment of the present invention.

4 is a functional diagram showing a spiral wrap of a second embodiment of the present invention.

5 and 6 are functional diagrams showing the relative positional relationship of the two spiral wraps of the first and second embodiments during the compression and ejection processes.

7 and 8 are functional diagrams showing the relative positional relationship of both spiral wraps of the first and second embodiments when the discharging process is completed.

9 and 10 are functional diagrams showing a method of designing an arc of a tip end section of a spiral wrap point of time in the first and second embodiments.

11 and 12 are front views showing a fixed scroll and a revolving scroll produced according to the present invention.

* Explanation of symbols for main parts of the drawings

1: Spiral Lab 2: Space

The present invention relates to a scroll compressor widely used in automobiles, refrigerators and the like, and more particularly to a new shape function of the spiral wrap of the scroll compressor.

Scroll-type compressors are widely used for circulation or forced feeding in automobiles and refrigerators because of their excellent extrusion force and discharge efficiency. The scroll compressor has a second formed therebetween as two opposing interlocking vortices fixed and revolving spiral laps 1 interlock with each other as shown in FIG. The space 2 of FIG. 2 is expanded and contracted to achieve a desired extrusion and ejection.

The shape of the spiral wrap is very important so that the performance of the scroll compressor depends on the shape of the spiral wrap. A scroll compressor having a function for defining various kinds of spiral wraps has already been invented, but the present inventors have found a new function that can solve problems such as wear and noise, and deterioration in compression efficiency, which had the shape function of a conventional spiral wrap. Invented a scroll compressor having a.

The shape function of the conventional spiral wrap is designed to be connected to the inner and outer involute curves in the center of the spiral lab so that the process of compressing and discharging is completely performed. There is a possibility that wear may occur when the tip portions of two spiral wraps are near by the force applied in the revolution progress direction to the curved surface formed by the arc connected to the curve, and the curve is connected to the curve of the tip portion and the inner involute curve. Due to the two arcs, the volume of the residual space (Top Clearance) formed at the completion of the discharging process cannot be sufficiently reduced, causing a loss of compression.

In designing two circular arcs that form a curve connected to the spiral wrap tip and the inner involute curve, the two arcs are in close contact with each other while the two tips of the spiral wrap are close to each other. It is an object of the present invention to design cross-sectional curved portions of the centers of both spiral wraps so as to minimize the force applied to the curved surface of the spiral wrap starting point connected to the inner involute curve in the direction of revolution.

The invention is explained in more detail in conjunction with the accompanying figures below.

3 is a drawing showing the first embodiment of the present invention. The curves [A-B] which form the front end cross section at the spiral wrap point and the curves [B-C] connected to the inner involute curve are shown in FIG. Arcs of radius [R] and [C], angle [β], respectively, and curves [P] and curves [B to C] are connected at points [B, C] while the slopes of the two curves are the same at this point. Do. Therefore, the two curves [P] and [B ~ C] are smoothly connected, and the process of compressing and discharging the refrigerant proceeds, so that the curve of the cross-section of the tip of the spiral spiral point corresponding to the curve [A ~ B] is curved [B ~ During the phase C], the two curves maintain their relative position relative to each other.

The [y] coordinates [j] and [i] of [M] and [N], which are the centers of the arcs [AB] and [BC], are 0, so that the tip of the revolution spiral wrap point from the relationship between the two arcs is the point [B]. The next time you pass it, it will fall from the arc [B ~ C], so the force on the inner part of both spiral wraps is minimal.

4 is a diagram showing a second embodiment of the present invention, in which curves [P] and curves [C ~ D] are smoothly connected so that the tangent slopes are the same at points [C, D], and curves [C ~ D] And [A ~ B] are circular arcs with radius [R] and [C] and angle [β], respectively. The relative positional relationship between the two curves during the phase is the same as that of the two curves [B ~ C] and [A ~ B] of the first embodiment.

Since the [y] coordinates of [M] and the point [D], which are the centers of the arcs [C to D], are the same, and the points [D] to the point [B] are connected by a vertical line, the tip of the spiral spiral wrap point is the point [D]. At the moment of contact with the circular arc [C ~ D], the linear part of the cross section of the central spiral section is theoretically superimposed as a straight line [B ~ D], and when the orbiting motion of the spiral spiral wrap proceeds to the next moment, The sites are separated from each other. Therefore, the force exerted on the inner portion of the spiral wrap by both spiral wrap points is minimized. In the first embodiment, when the front end portion of the center of the spiral wrap makes contact with the point [B] by the height of the spiral wrap, In contrast, the surface contact is made by the straight line [BD] and the spiral wrap height to prevent stress concentration at the contact portion and to minimize the remaining space that may be caused by the assembly and processing tolerances to prevent the loss during refrigerant discharge.

In the first and second embodiments,

R = r + c

r = π * b-t

0≤β <180 °

b: fundamental radius of involute curve

t: Wrap thickness of spiral wrap

r: idle radius of the spiral wrap

Becomes

5 and 6 show the relative positional relationship of the two spiral wraps of the first and second embodiments during the compression and discharge process, and FIGS. 7 and 8 show the first and second embodiments when the discharge process is completed. It is represented by the relative positional relationship of both spiral wraps.

9 and 10 are diagrams showing a method of designing an arc of the tip end section of the spiral wrap in the first and second embodiments, wherein the rotation angle [ø] of the involute is always 0 or more (0 ≦ ø) [B '] is the starting point of the involute curve, and the [x] coordinate of point [B] indicates that the fixed and idle involute curves are different from each other when the inner involute curve of the idle spiral wrap moves along the idle radius. It is determined by extending a certain distance [Δt] to meet.

In the case of the first embodiment, as shown in Fig. 9, the coordinate of the center of the circle which is in contact with the curve [Q] and the other one point through the point [B] and one point on the circumference through the point [B] are zero. And the radius [C] is determined to determine the arcs [A-B], which are smoothly connected to the outer involute curve [Q].

In the case of the second embodiment, the radius [C] of the arcs [A] to [B] is set smoothly so that the cross-sectional shape of the tip portion does not cause stress concentration. As shown in FIG. 10, one point on the circumference falls at the point [E]. When the arcs [A ~ B] are determined by obtaining the center coordinates of the circle that is in contact with the vertical line and the other point is in contact with the curve [Q], the arc is smoothly connected to the outer involute curve [Q].

In the first and second embodiments, the rotation angle [ø] of the involute for determining the contact point [A] of the curve [Q] and the arcs [A] to [B] is ° <° <90 ° and the first embodiment. In the example, the function f (ø) to find [ø] is

f (ø) = B + g (ø) * (1 + sinø) -x (ø)

g (ø) = b + t-b * tanø

x (ø) = (b * ø + t) * sinø + b * cosø

B: x coordinate of B point

In the second embodiment, the function f (ø) for obtaining [ø] is

f (ø) = B + C + C * cos ( ) -x (ø)

x (ø) = (b * ø + t) * sinø + b * cosø

B: [x] coordinate of point [B]

Characterized by being.

11 and 12 are front views of idle and fixed spiral wraps fabricated in this manner.

Claims (1)

In a scroll compressor in which two spiral wraps of the same shape are engaged with each other by 180 ° rotation, and one spiral wrap revolves about the other spiral wrap with an idle radius [r] to form a closed space. Forming a curve with a rotation angle of 0 ° of the basic circle; The inner involute curve of the central part of the spiral wrap is smoothly connected to the arc of radius [R] and smoothly connected to the arc of the tip of the spiral wrap point of radius [C]. A function f (ø) that calculates the rotation angle of the base circle that determines a point on the involute curve to smoothly connect the outer involute curve f (ø) = B + g (ø) * (1 + sinø) -x (ø) (0 <ø <90 °), g (ø) = b + t-b * tanø, x (ø) = (b * ø + t) * sinø + b * cosø, b: fundamental radius of involute curve t: Wrap thickness of spiral wrap B: [x] coordinate of the point extended by the micro distance from the spiral wrap viewpoint; The curve of the inner center of the spiral wrap is connected to the arc of the cross section of the center end of the spiral wrap in a vertical line, and the base circle is used to determine a point on the involute curve to smoothly connect the arc and the outer involute curve. The function f (ø) for calculating the rotation angle f (ø) = B + C + C * cos (ø- ) -x (ø) (0 <ø <90 °), C: Radius of arc at the cross section of the distal end of the spiral wrap (0 <C < ) Scroll type compressor characterized in that it has a spiral wrap having a curve defined as.