KR0173581B1 - Scroll type fluid machinery - Google Patents

Abstract

The present invention relates to a scroll type compressor, which simplifies the structure of the compressor and can be easily assembled and disassembled, and reduces the surface pressure generated between the fixed scroll member and the rotating scroll member during the axial bias of the fixed scroll member. Equipped with a spring and a check valve for preventing the back flow of high pressure fluid in the discharged high pressure tank, installed on the upper part of the high / low pressure separation plate adjacent to the discharge port to increase efficiency due to the prevention of recompression when the compressor is stopped during operation And prevent the damage of the device and the wear of the wrap due to the reverse rotation to increase the reliability of the product, and by assembling the upper and lower frames with a fastening mechanism on the same axis, it is structurally stable, thereby reducing the initial vibration Quiet driving is effective.

Description

Scroll Fluid Machine

1 is a vertical sectional view showing the configuration of a conventional scroll fluid machine.

2 is a vertical cross-sectional view showing the configuration of a scroll fluid machine according to the present invention.

(A) of FIG. 3 is an enlarged view of the upper part of FIG.

(b) is an enlarged view showing another embodiment of (a).

(A) of FIG. 4 is an enlarged side view of FIG.

(b) is an enlarged view showing another embodiment of (a).

5 is a plan sectional view showing an axial bias guide of the fixed scroll member.

(A) is a partially enlarged sectional view which shows the check valve open state of the upper discharge port.

(b) is a partially enlarged sectional view which shows the check valve closed state of the upper discharge port.

FIG. 7A is a cross-sectional view showing another embodiment of FIG. 6A.

(b) is sectional drawing which shows another Example of FIG. 6 (b).

8 is a plan sectional view of the upper discharge port according to the invention.

* Explanation of symbols for main parts of the drawings

A: Sealing shell 1: Fastening bolt

10: check valve 11: valve housing

12: valve plate 12a: discharge hole

12b: recess 13: stop ring

14: discharge port 20: compression chamber

30: fixed scroll member 31: wrap lower end

32: fixed scroll member protrusion 33: protrusion side

35: fixed scroll sealing surface 40: swinging scroll member

41a, 41b: groove 42: wrap upper portion

45: turning scroll sealing surface 50: upper frame

51: upper frame groove side surface 52: groove

60: high / low pressure separator 61: separator plate blocking surface

65 back pressure chamber 70 rotating shaft

71: rotating shaft coupling 80: old box coupling

90: intermediate chamber 100: upper chamber

111: high pressure tank 112: discharge piping

110: lower chamber 120: lower frame

121: wave spring 122: valve plate

122a: inclined hole 130: seal member

140: spring 150: flange

151: street setting 152: stator

153: fastening member 154: cap

The present invention relates to a scroll fluid machine, and more particularly, to a scroll fluid machine capable of optimizing the energy utilization efficiency by increasing the compression efficiency and compaction efficiency by compressing or expanding the fluid.

In general, scroll fluid machines have been applied in various fields such as expanders, mobile engines, fluid pumps, compressors, and the like.

Such a scroll fluid machine includes a circular end plate and one scroll member which forms a spiral or involute wrap, the two scroll members being fitted together with each other with 180 ° rotation of the scroll member relative to the other scroll member, thereby providing a plurality of spaces between the sides of each cover. Crescent-shaped line contact sealing surfaces are formed. Such a device works by pivoting one scroll member along a constant trajectory by an outer box coupling that functions as an eccentric shaft and an anti-rotation function with respect to the other scroll member. A moving line contact and a scroll member between the sides of each member form a sealing surface contact between the two scroll members by an axial bias so that a mobile sealed crescent sealing surface of fluid is created in the two members. Ideally, there is no rotation of the state between the two members in operation, i.e. purely curved translation. The fluid sealing surfaces include fluid that is processed from any one area of the scroll type device including the suction fluid to an area having any discharge port containing the discharge fluid. As the sealing surface moves toward the discharge port, the volume of the sealing surface changes. When there are at least one pair of sealing surfaces at a moment, and when there are several pairs of sealing surfaces at the same time, each pair of sealing surfaces has a different volume and pressure. Here, how much higher the pressure of the fluid in the discharge state than the pressure of the fluid in the suction state can be adjusted according to the size of the angle according to the shape of the involute wrap. The fluid pressure in the discharge port region in the scroll device is higher than the pressure in the region containing the suction fluid.

The two types of contact portions are effective in terms of the stability of the balance between the inertia force and the inclination moment force generated by the radial centrifugal force at the lateral contact surfaces of the spiral surfaces of the two scroll members. Sealing surface formation is determined.

In addition, by providing the optimum restoring force to offset the axial separation force acting in the axial direction between the end portions of each member and the sealing surface to maintain the sealing surface of the wrap front end in an optimal state, which is in the crescent-shaped sealing surface of the high pressure part. It is important to ensure that the fluid does not flow back into the low pressure crescent seal surface. Therefore, how effectively the sealing state of the two forms (side contact sealing, lap tip sealing) sealing surfaces can be maintained is a necessary and sufficient condition for obtaining a fluid pressure of high efficiency.

The advantage of the scroll type fluid machine is that the re-expansion that occurs in the reciprocating compressor does not occur, and the gas leakage during compression is effective sealing by the two contact surfaces, so that the gas leakage is minimized to have high volumetric efficiency. Due to the simultaneous compression in many of these opposing sealing surfaces, the vibration caused by pressure generation is less because it is one-way, and the amount of torque required for normal operation and the required torque at start-up is about 10 minutes compared to the reciprocating compressor. Therefore, since the size is smaller than the reciprocating type and the number of parts used is remarkably small, it can be lighter and smaller than a predetermined capacity, and noise and vibration are small.

Many such scroll fluid machines have been proposed, for example, as disclosed in US Pat. Nos. 38,748,27 and 47,729,3, which push the fixed scroll member axially to extract a constant pressure in the compression chamber to seal the tip of the scroll wrap. A method of constructing a seal end surface of the wrap tip by axially pushing the fixed scroll member by constructing a separate pressure chamber (back pressure chamber) on the top of the fixed scroll member has been proposed. Also, US Patent Nos. 3884599, 3924977 and 4192152 have been proposed. As in the arc and the like, a separate back pressure chamber was formed by extracting pressure in a scroll compression chamber for making a pressure medium for biasing the fixed and swinging scroll members in the axial direction. At this time, the biasing in the axial direction of the fixed and swing scroll member by the pressure in the pressure chamber formed in a separate back pressure chamber, there was a problem that this movement is not stable.

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

1 shows a conventional scroll fluid machine, which is provided with a sealing shell A on the outermost side, which is divided into an upper chamber 100 and an intermediate chamber 90. An upper frame 50 is fixed in the sealing shell A, and a compression chamber for compressing a fluid between the fixed scroll member 30 and the turning scroll member 30 provided on the upper frame 50. Sealed and compressed to form a 20, the lower portion of the rotating scroll member 40 is provided with an upper frame 50 and a lower frame 120 for supporting the rotating shaft 70. The outer box coupling 80 is mounted on the groove 41 to be parallel to the lubrication surface of the upper frame 50 to convert the rotational movement of the rotary shaft 70 into a curved translation. According to the linear movement to the left / right, the fixed scroll member 30 is assembled to the upper frame 50 is assembled together with the fastening bolt (1) to the upper frame 50 by a certain distance in the axial direction / It is supposed to be a restraint sliding movement. The upper frame 50 has a cylindrical wall surface 4b extending integrally downward, and the wall surface 4b of the extended upper frame 50 and the lower frame 120 are fastened to each other by bolts 153a. Is assembled. A radial coupling 71 is provided on the outer circumferential surface of the rotary shaft 70 to allow stable absorption of the inertia force and the inclination moment in the axial direction that are generated during the curved translational movement. A high / low pressure separation plate 60 is installed on an upper portion of the fixed scroll member 30, and a back pressure chamber 65 is formed on an inner upper portion of the high / low pressure separation plate 60, and the fixed scroll member ( A plurality of discharge ports 14 having discharge paths are formed in the upper part of 30 to disperse and discharge the compressed fluid. In order to seal each of the discharge ports 14, the outer circumferential surface is press-sealed with the seal member 130, and a discharge pipe 112 for discharging the fluid discharged from the discharge port 14 to the outside of the compressor is provided in the upper chamber 100. It is provided on one side.

However, the conventional scroll fluid machine configured as described above has the intermediate chamber 90 having an integrated structure, and when the internal structure is assembled or disassembled into the chamber, the entire structure has to be lifted, and the upper frame 50 and the lower part are integrated. In order to assemble the frame 120, an unnecessary loss occurs as the upper frame 50 is extended for a long time, and thus the upper frame 50 and the fixed scroll member 30 are firmly fixed to the fastening bolt 1. At this time, when the fixed scroll member 30 and the swinging scroll member 40 are assembled by 180 ° rotation by the thread spacing with the bolt 1, and when the fixed scroll member 30 is biased in the axial direction As the area of groove and slider surface formed to move stably is not enough, excessive surface pressure is applied, and the discharged fluid flows back into the compression chamber There are various problems such as structural contradiction and component wear caused by rotation.

Accordingly, the present invention has been made to solve the above problems, simplify the assembly and disassembly by simplifying the structure of the compressor, reducing the surface pressure generated during the axial bias of the fixed scroll member, discharged high pressure tank It is an object of the present invention to provide a scroll fluid machine capable of preventing the backflow of the high pressure fluid in the interior.

The present invention for achieving the above object is to be able to immediately mount the fixed scroll member and the rotating scroll member to the upper frame without a separate assembly means, between the fixed scroll member and the rotating scroll member during the axial bias of the fixed scroll member It is provided with a spring to reduce the surface pressure generated in the upper part, and the wall part of the upper frame is removed to fasten the upper frame and the lower frame with bolts or pins, and when the compressor is stopped during compression, By installing a check valve that can prevent the back flow in the upper portion of the high / low pressure separation plate adjacent to the discharge port, it is characterized in that the compressed fluid in the high pressure tank to prevent the back flow.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The same components as those of the prior art will be described with the same reference numerals.

Figure 2 shows an embodiment according to the present invention, the outermost there is a sealing shell (A), the sealing shell (A) is the upper chamber 100 is configured on the top, the upper chamber 100 It is separated into the intermediate chamber 90 and the lower chamber 110, the fixed scroll member 30 and the rotating scroll member 40 and the upper and lower frames 120 fixed in the sealing shell (A) The fixed scroll member 30 and the upper frame 50 are coupled to each other by fitting without a separate fastening member, and the upper frame 50 and the lower frame 120 are wall surfaces of the upper frame 50. 4b is removed and fixed by the fastening member 153. An upper portion of the fixed scroll member 30 is coupled by a high / low pressure separation plate 60, and a discharge port 14 for discharging the compressed fluid is formed in the upper center of the fixed scroll member 30, and the rotating scroll An outer box coupling 80 having an outer diameter reduced in the lower portion of the member 40 is disposed above the upper frame 50. In addition, as shown in FIG. 5, a plurality of protrusions 32 are formed at predetermined intervals along the circumferential direction of the fixed scroll member 30, and the formed protrusions 32 are formed on the upper frame 50. The groove portion 52 is formed at each corresponding position of the protrusion portion 32 so that the protrusion 32 is inserted and supported 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. The fixed scroll member 30 is suppressed by the blocking surface 61 of the high / low pressure separation plate 60 when the fixed scroll member 30 is moved upward by receiving the internal pressure, and is attached to the high / low pressure separation plate 60 to supply the high pressure tank. And a check valve 10 for preventing a back flow of the fluid from the 111. The leakage preventing seal member 130 is to be installed between the lower contact surface of the high / low pressure separation plate 60 and the upper contact surface of the fixed scroll member 30, and the seal member 130 is installed in a radial direction as in the prior art. Instead, they are installed in the axial direction. The old box coupling 80 is formed with four protrusions, two pairs of two are formed on the same plane, the pair of protrusions are inserted into the groove portion (41a) of the upper frame 50 The other pair of protrusions are inserted into the recess 41b formed in the bottom surface of the end plate of the turning scroll member 40 to reduce the outer diameter of the old box coupling 80.

FIG. 3 (a) is a detailed cross-sectional view showing the role of the upper stop when the fixed scroll member 30 in the upper portion of the frame moves in the axial direction by the axial bias in the lower portion of the high / low pressure separating plate 60. The lower surface of the high and low pressure separation plate 60 is formed in a structure that accurately maintains a predetermined distance. At this time, the initial state of the fixed scroll member 30 is supported by the bottom of the high / low pressure separation plate 60 by the spring 140 of the wrap upper end 42 and the fixed scroll member 30 of the rotating scroll member 40 The sealing surface 35 and the sealing surface 45 of the swing scroll member 40 and the wrap lower end portion 31 of the fixed scroll maintain a predetermined interval a to favor initial startup, and after completion of the initial startup, the back pressure chamber ( 65, the sealing lower surface 31 of the fixed scroll member 30 and the sealing surface 45 of the rotating scroll member 40, and the sealing surface 35 and the rotating scroll member 40 of the fixed scroll member 30 by the back pressure in the inside. The upper end of the wrap (42)) is to be able to play a role to increase the reliability of the product by preventing the leakage by the sliding motion in close contact to increase the efficiency. (B) of FIG. 3 shows another embodiment of (a) of FIG. 3, and shows the case where the seal member 130 is installed on the high / low pressure separating plate.

(A) of FIG. 4 shows that when the rotating shaft 70 is rotated by the power mechanism, the conventional upper frame 50 wall 4b is removed, and the upper and lower directions of the upper frame 50 and the lower frame 120 are removed. As a method of firmly connecting the supporting parts so that they can be located on the same axis, the flange 150 is firmly assembled to the intermediate chamber 90 and the upper frame 50 is defined based on the machined surface. After positioning to be on the same axis as the stator 152, the stator 152 and the lower frame 120 is connected to match the center of the upper frame 50 and the center of the lower frame 120 to drive smoothly. And, to eliminate vibrations to provide a quiet operation, the wave spring 121 inserted into the lower contact surface of the stator 152 and the lower frame 120 serves as a buffer between them to be smoothly started during initial startup To be able. Figure 4 (b) is to be able to perform the role of the fastening member 153 and the distance setting piece 151 at the same time.

On the other hand, (a) of FIG. 6 shows that the pressurized fluid passes through the discharge port 14 and pushes the valve plate 12 up to a certain amount of upward movement. Then, the compressed fluid passes the through portion of the valve plate 12 and passes through the high pressure tank. After being collected at the 111, it is discharged to the outside through the discharge pipe 112. (b) indicates that when the operation is stopped, some of the compressed fluid in the high pressure tank 111 moves downward in the downward direction at the moment of applying a concentrated force to the recessed portion 12b of the valve plate 12 to block the discharge port 14 so as to reverse the flow of the compressed fluid. It has a structure that can prevent.

FIG. 7A is a cross-sectional view showing another embodiment of FIG. 6A. The stop ring 13 is fixed and installed in the high / low pressure separation plate 60, and the stop ring 13 of FIG. The valve plate 122 that can be raised and lowered at a lower distance is provided. The valve plate 122 is formed with a plurality of inclined holes 122a inclined to be concentrated in the center at predetermined intervals along the circumferential direction. When discharging the compressed fluid from the compression chamber, as shown in FIG. 7A, the valve plate 122 is raised and stopped by the stop ring 13, and at this time, the inclined hole formed in the valve plate 122 Compressed fluid is discharged through 122a.

8 is a plan view showing the configuration of the check valve 10 having a plurality of discharge holes 12a on the upper surface of the discharge port 14. In particular, in the conventional method, the position of the check valve 10 is changed to the discharge pipe ( 112) Compression fluid inside the high-pressure tank 111 flows backward when the operation stops, causing the reverse rotation of the rotating shaft 70 to generate a reverse current of the motor, thereby damaging the device and abrasion of the wrap. And there is a structural contradiction, the present invention is to prevent the back flow of the compressed fluid in the high-pressure tank 111 by installing a check valve 10 on the high / low pressure separation plate 60, which is close to the compression site. .

As described above, the scroll type fluid machine according to the present invention prevents damage to the device and wear of the wrap due to the increase in efficiency due to the recompression prevention and the reverse rotation when the machine stops during the operation of the machine, thereby increasing the reliability of the product. It is structurally stable by reducing the number, which has the effect of quiet operation.

Claims (9)

A sealing shell comprising an upper chamber and an intermediate chamber, and a fixed scroll member and a rotating scroll member fixed to the upper and lower frames to compress the fluid in the sealing shell, wherein the sealing shell comprises an upper chamber and an intermediate chamber; The intermediate chamber and the lower chamber are fitted into each other by fitting the lower chamber, the lower and the upper frame of the fixed scroll member is coupled to each other by fitting without a separate fastening member, and the upper surface and the high / The lower surface of the low pressure separation plate is spaced apart by a predetermined distance to be coupled to each other so that the upward movement of the fixed scroll member to maintain a predetermined distance, a check valve is mounted on the upper discharge port in the center of the high / low pressure separation plate, the fixed Fixed scroll member and pivoting scroll by a plurality of springs inserted into the groove formed between the scroll member and the upper frame The predetermined pressure is maintained to reduce friction between ashes, and the upper frame fixed by the flange assembled to the intermediate chamber and the lower frame coinciding with the center are fixed to each other by the fastening member, and the lower part of the lower frame and the stator are fixed. A scroll fluid machine, characterized in that the shock is buffered by a wave spring inserted between the contact surface. The scroll fluid machine of claim 1, wherein a plurality of protrusions are formed at predetermined intervals along the circumferential direction of the fixed scroll member. The fixed scroll member according to claim 1 or 2, wherein the upper frame is provided with a recess corresponding to each of the protrusion positions, and the protrusion is inserted into the recess to support the protrusion by the centrifugal force during the pivoting movement of the swing scroll member. The fixed scroll member is slid from each other at the side of the protrusion formed on the outer circumferential surface and the side of the groove portion of the upper frame when the fixed scroll member is prevented from rotating, so that the fixed scroll member can be moved up and down. Fluid machinery. 2. The scroll fluid machine of claim 1, wherein the check valve comprises a valve housing having a center hole and a valve plate provided at a lower portion of the valve housing and capable of lifting and lowering according to the flow of compressed fluid. . The method according to claim 4, wherein a plurality of discharge holes are formed at the edge of the valve plate to rapidly diffuse the flow of the fluid of the high pressure tank from the discharge port when discharged, and concentrate the flow of the fluid to the center of the valve plate when stopped. Scroll fluid machine, characterized in that made to close the check valve quickly. The scroll fluid machine of claim 4, wherein a recess is formed in the center of the valve plate. The scroll fluid machine of claim 1, wherein a distance setting piece is fitted to a flange assembled to the intermediate chamber, and a cap is fitted to one end of the distance setting piece so as to engage the upper and lower frames. The scroll fluid machine of claim 1, wherein the check valve includes a stop ring fixed in the high / low pressure separation plate and a valve plate capable of raising and lowering the stop ring. 10. The scroll fluid machine of claim 8, wherein a plurality of inclined holes inclined toward the center are formed to allow the compressed fluid to enter and exit the valve plate.