KR19980025468A - Scroll Fluid Machine - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll fluid machine configured to allow stable compression and low noise operation in an axial biasing method when a fluid is compressed by a pair of scroll members arranged in a sealing shell. It is provided with two guide devices to block the noise generated between the guide device and the fixed scroll member or the high / low pressure separating plate, which is a relative part, inside the closed space to block the transmission to the outside. It blocks the double by the sealing member to absorb the noise by itself, and the position setting pin is used to position the high / low pressure separator based on the upper frame to facilitate the assembly between the upper frame and the high / low pressure separator. Decisions can act as guide pins, so that the occurrence of failures by simplifying the parts as a whole By reducing the product's reliability and simplifying the assembly, it has the effect of quiet operation.

Description

Scroll Fluid Machine

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor, and more particularly, to a scroll fluid machine for maximizing the sealing property between a fixed scroll member and a swing scroll member of a scroll compressor.

In general, the basic principles of scrolls developed and applied in various fields such as compressors, vacuum pumps, expanders, engines, etc. were first proposed by Leon Creux, France, and patented in the United States in 1905, and then in 1974, Arther D in the United States. Developed by Little for helium compressors, especially scroll compressors for automotive air conditioners were developed by Sanden of Japan in 1981 and succeeded for the first time. In the case of air-conditioning scroll compressors, Hitachi of Japan It was commercialized in 1983. The biggest opportunity for the practical use of scroll compressors was the development of high precision CNC machining technology for the processing of scroll wraps, which improves the performance of the entire refrigeration system by improving the efficiency of the compressor. In terms of savings, the compressor has high efficiency, low noise and low vibration. Could.

The overall shape of the scroll device is a structure in which a circular end plate and a spiral or involute wrap are integrated, and the rotating scroll member is rotated by 180 ° with respect to the corresponding fixed scroll member, and the two scroll members are fitted together. A plurality of line contact portions are formed between the covers, and the swing scroll member is operated while pivoting along a predetermined track by an outer ring coupling functioning as an eccentric shaft and an anti-rotation function with respect to the fixed scroll member. A moving line contact portion is formed between the side surfaces of the respective members, and a sealing surface contact portion is formed between the two scroll members by an axial bias of the swing scroll member, wherein the movable sealed crescent pockets of the fluid are formed in the two members. There is no relative rotation, i.e., a curved translational movement, between the two formed and ideally operating members. At this time, a plurality of crescent-shaped fluid pockets are formed from any one region of the scroll compressor including the suction fluid to an region where any discharge port including the discharge pressure is formed. As the sealing pocket moves toward the discharge port, the volume of the sealing pocket changes, and each pair of pockets has a different volume even when there are several pairs of sealing pockets, as with at least one pair of sealing pockets at any one time. And the pressure of the discharge port region in the scroll device is higher than the pressure of the region containing the suction fluid.

At this time, the two types of contact portions are movable line contact portions caused by radial forces between the side surfaces or the spiral surfaces of the two scroll members, that is, tangential contact portions extending in the axial direction between the side surfaces of the scroll members, and the tip portions of each member. Expressed as a sealing surface contact caused by axially compliant stress between the sealing surfaces, the contacts form a movable sealed crescent fluid pocket between the scroll members. Thus, the effective sealing of the two types of contact surfaces is a necessary and sufficient condition for obtaining high compression efficiency.

In addition, in the scroll compressor, leakage of compressed gas and wear of the material are caused by a large or no gap generated between the fixed scroll member and the swing scroll member, and the shape of the gap is largely between the sides of the two scroll members. A radial clearance that occurs and an axial clearance that occurs between the bottom of the fixed scroll member and the top of the swing scroll member. In order to reduce the radial clearance, a method of using a compliance coupling between the rotating shaft and the turning scroll has been developed. In the axial clearance, a back pressure chamber is placed above or below each scroll member. The back pressure chamber structure is such that when the compressed gas in the compression chamber pushes the scroll member in the axial direction, the back pressure chamber pressure pushes the scroll member in a direction opposite to this direction to control the axial clearance.

In addition, a more detailed conventional example will be described in detail with reference to the accompanying drawings.

Figure 1 shows a conventional scroll fluid machine, the outermost of the upper chamber 100, the intermediate chamber 90 and the lower chamber 110, etc., separated from each other, welded shell (A) is formed, The high / low pressure separating plate 60 is welded to the sealing shell A to the inner top of the sealing shell A so as to suppress the fixed scroll member 30 from moving upward in response to the internal pressure. The fixed scroll member 30 is mounted to the lower portion of the low pressure separating plate 60, and the rotating scroll member 40 is sealed to the fixed scroll member 30 to form a spiral compression chamber 20 for compressing the fluid. It is compressed, the lower portion of the fixed scroll member 30 is seated on the upper end of the upper frame 50, the groove spring formed in the upper end of the upper frame 50 is inserted into the stop spring 140 fixed scroll at the initial startup To reduce the load generated between the member 30 and .

In addition, the upper frame 50 and the lower frame 120 supporting the rotating shaft 70 is firmly fastened by a fastening member 153 inserted between the flange 150 welded to the intermediate chamber 90.

In this case, an upper bearing 53 is press-fitted into the upper frame 50, and a center inside of the lower frame 120 is formed as a lower bearing 122, and the upper bearing 53 and the lower bearing 122 are formed. Is positioned on the same axis line, and the rotary shaft 70 is fitted therein, and the upper portion of the rotary shaft 70 is connected to the inside of the pivoting scroll member 40 and is fitted to the outer circumferential surface of the rotary shaft 70 to perform a curved translational motion. A radial coupling 71 is provided to allow a stable absorption of the inertia force and the inclination moment generated in the axial direction, and a rotation shaft 70 disposed between the upper frame 50 and the lower frame 120. The rotor 154 press-fitted by an interference fit is integrally formed in the central portion of the center, and a gap of a certain interval is maintained between the rotor 154 and the stator 152.

In addition, in the grooves 41a and 41b formed between the upper end of the upper frame 50 and the pivoting scroll member 40, the outer box coupling for converting the rotational movement of the rotary shaft 70 into a curved translational motion ( 80) will be mounted.

A back pressure chamber 65 is formed at an inner upper end of the high / low pressure separation plate 60, and a discharge port 14 is formed at the upper part of the fixed scroll member 30 to disperse and discharge the compressed fluid. The discharge pipe 112 for discharging the fluid discharged from the discharge port 14 to the outside of the compressor through the high pressure tank 111 of a predetermined space is provided on one side of the upper chamber 100, A check valve 10 for preventing a back flow of the fluid from the tank 111 is attached to the upper side of the discharge port 14, the lower contact surface of the high and low pressure separation plate 60 and the fixed scroll member 30 A leakage preventing seal member 130 is provided between the upper contact surfaces in the axial direction.

In addition, as shown in FIG. 2, a plurality of protrusions 32 are formed at predetermined intervals along the circumferential direction of the fixed scroll member 30, and the protrusions 32 formed on the upper frame 50. The groove portion 52 is formed at each corresponding position of the protrusion 32 so that the fixed scroll member 30 does not rotate by the centrifugal force during the pivoting movement of the swing scroll member 40. When the fixed scroll member 30 is axially biased, the fixed scroll member 30 is slid from the side surface of the protrusion portion 32 formed on the outer circumferential surface and the side surface 51 of the groove portion 52 of the upper frame 50. Allow up and down movement.

At this time, when the fixed scroll member 30 is fixed to the rotational force of the rotating shaft 70 is transmitted to the pivoting scroll member 40, the rotating scroll member by the outer box coupling 80 40 is a rotational movement rather than a rotational movement, which causes the fluid to be compressed.

Thus, the scroll compressor has no recompression and re-expansion as compared with the reciprocating compressor, and is effectively sealed by the contact surfaces, thereby minimizing leakage. Due to the simultaneous compression inside the plurality of opposing pockets, the fluid flow is unidirectional, so the pressure generation vibration is small, and the number of parts is small, so the production cost is 10-20% lower than the predetermined capacity. There is an advantage that can be manufactured in a light weight, compact.

However, despite the excellent performance of the scroll compressor as described above, it is structurally unstable and inefficient with respect to the axial compliance, and the noise generated by the guide device during the axial bias is easily transmitted to the outside, and the noise is severe. There is a problem that there is an increase in the number of parts and a rise in manufacturing cost caused by the complex structure of.

Accordingly, the present invention has been made in order to solve the above problems, to prevent the rotation of the fixed scroll member made in the back pressure chamber and the axial direction by mounting a plurality of guide pins in the back pressure chamber for axial stability. The purpose of the present invention is to provide a scroll type fluid machine which blocks the internal and external sides of the back pressure chamber with a seal member so that noise is not transmitted to the outside and simplifies parts.

The present invention for achieving the above object is equipped with a plurality of guide pins between the high / low pressure separation plate and the fixed scroll member to stably perform the axial direction of the fixed scroll member in the axial direction, and the high / low pressure Between the separation plate and the upper frame is characterized in that the mounting position pins to accurately guide the position and direction of the fixed scroll member.

1 is a vertical sectional view showing a conventional scroll fluid machine

Figure 2 is a cross-sectional view taken along the line A-A of Figure 1 showing the axial bias guide portion of the fixed scroll member

3 is a vertical sectional view of a scroll fluid machine according to the present invention;

4 is an enlarged detail view of a portion B of FIG.

5 is an enlarged detail view showing another embodiment of FIG.

6 is an enlarged detail view showing still another embodiment of FIG.

FIG. 7 is an enlarged detail view of part C of FIG.

FIG. 8 is an enlarged detail view showing another embodiment of FIG. 7; FIG.

* Explanation of Signs of Major Parts of Drawings *

a, x: clearance 30a: edge of fixed scroll member

50a: upper frame protrusion 55: sliding part

160: position setting pin 170: guide pin

171: Information Home

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 and 4 show an embodiment according to the present invention, the guide pin 170 is inserted between the high / low pressure separation plate 60 and the fixed scroll member 30 to penetrate the back pressure chamber 65. However, one end of the guide pin 170 is fixed to the lower end of the high / low pressure separation plate 60, and a predetermined guide groove 171 is formed on the upper end of the fixed scroll member 30 to guide the pin. The other end of the 170 is inserted to be movable so that vertical movement of the fixed scroll member 30 is guided.

Figure 5 shows another embodiment of Figure 4, the guide groove 171 is formed in the lower end of the high / low pressure separation plate 60 to insert one end of the guide pin 170 to be movable, the other end Is inserted to be fixed to the upper end of the fixed scroll member (30).

6 illustrates another embodiment of FIG. 4, wherein the guide pin 170 is formed by forming a predetermined guide groove 171 at the lower end of the high / low pressure separation plate 60 and the upper end of the fixed scroll member 30. ) Is inserted to be movable.

FIG. 7 illustrates the upper frame 50 by inserting a plurality of positioning pins 160 between the upper protrusion 50a of the upper frame 50 which is in contact with the edge bottom surface of the high / low pressure separation plate 60. Since the high / low pressure separation plate 60 is fitted, it is easily assembled, and is defined between the outer edge portion 30a of the fixed scroll member 30 and the inner side of the upper protrusion 50a of the upper frame 50. It will be mounted at a distance.

FIG. 8 illustrates another embodiment of FIG. 7, wherein the sliding portion 55 contacts the edge portion 30a of the fixed scroll member 30 and the upper protrusion 50a of the upper frame 50 to slide together. It is to be guided to each other when moving up and down of the fixed scroll member (30).

When the scroll type fluid machine configured as described above is operated, the fixed scroll member 30 and the swinging scroll member 40 move relative to each other by the rotational force of the rotating shaft 70, thereby compressing the fluid. At this time, as shown in Figure 4, the internal pressure generated in the compression chamber 20 pushes the fixed scroll member 30 toward the high / low pressure separation plate 60, the gap (a) is 0 do. As the compression proceeds, the compressed fluid is supplied from the compression chamber 20 to the back pressure chamber 65 through the flow path 34, and the fixed scroll member 30 is driven by the pressure of the small amount of fluid. When pressing down), the gap (a) value is instantaneously maximized, and the leakage of fluid is completely blocked by the seal member 130, and the fixed scroll member until the balance between internal pressure and back pressure is balanced. The up / down rocking motion of 30 is in an unstable state.

At this time, since the plurality of guide pins 170 guide the fixed scroll member 30 along the high / low pressure separation plate 60, the fixed scroll member 30 can be stably executed in the axial direction. After the noise generated in the guide groove 171 sliding along the guide pin 170 is diffused through the back pressure chamber 65, it is blocked by the seal member 130 formed on the inside, the outside, respectively, Since the upper surface of the fixed scroll member 30 is in close contact with the bottom of the high / low pressure separation plate 60 during the axial bias, noise generated in the back pressure chamber 65 is not transmitted to the outside, thereby enabling low noise operation. .

In addition, another function of the guide pin 170 is a rotation prevention function of the fixed scroll member 30, so that the rotational force generated during the swinging motion of the swinging scroll member 40 is transmitted to the fixed scroll member 30 When the rotation of the fixed scroll member 170 generated by the rotational force is prevented by a plurality of guide pins 170, the position of the guide pins 170 is the high / low pressure separation plate 60 and the upper It is accurately maintained by the positioning pin 160 is firmly fastened to the frame 60.

As described above, the scroll-type fluid machine according to the present invention, after the noise generated in the guide groove sliding along the guide pin is diffused through the back pressure chamber, it is blocked by the seal member formed on the inside and the outside, so that low noise operation is possible. When the axial biasing, the upper surface of the fixed scroll member is in close contact with the bottom of the high / low pressure separation plate, so no separate stopper is required, and separate parts and guide devices necessary for maintaining a constant distance in the axial direction from the high / low pressure separation plate As the number of parts required for fixing is small, the manufacturing cost and the occurrence of trouble are reduced, and the quality and reliability of the product can be improved, and by reducing the outer diameter of the fixed scroll member, it can be manufactured in a small size, thereby reducing the weight and movement of the product. It is convenient and easy to connect to the post process, it is effective to reduce the size of the finished product Overloading will be effective as possible a structurally simple and reliable and economical and quiet operation.

Claims (4)

In the scroll type fluid machine in which the fixed scroll member 30 and the swing scroll member 40 compress the fluid while opposing movement on the upper frame 50 in the sealing shell A, the high / low pressure separation plate 60 Since a plurality of position setting pins 160 are inserted between the bottom edge of the edge and the upper protrusion 50a of the upper frame 50 so as to be mutually fitted to each other, they are assembled, but the outer edge portion 30a of the fixed scroll member 30 is outside. And a guide pin between the high / low pressure separation plate 60 and the fixed scroll member 30 to penetrate the inner side of the upper protrusion 50a of the upper frame 50 at a predetermined distance and penetrate the back pressure chamber 65. Insert the 170, but one end of the guide pin 170 is fixed to the lower end of the high / low pressure separation plate 60, a predetermined guide groove 171 on the upper end of the fixed scroll member (30) Formed so that the other end of the guide pin 170 is movable The scroll fluid machine, characterized in that the group so that the vertical movement of the fixed scroll member 30 is guided by the guide pin 170. The scroll fluid machine of claim 1, wherein the guide groove (171) is formed at a lower end of the high / low pressure separation plate (60). The scroll fluid machine of claim 1, wherein a predetermined guide groove (171) is formed in communication with a lower end of the high / low pressure separation plate (60) and an upper end of the fixed scroll member (30). According to claim 1, wherein the outer side between the edge portion 30a of the fixed scroll member 30 and the inner side of the upper protrusion 50a of the upper frame 50 in order to guide the vertical movement of the fixed scroll member 30 Scroll type fluid machine, characterized in that the contact, the sliding portion 55 is formed.