JPH0592485U - Scroll compressor - Google Patents

Abstract

(57) [Abstract] [Purpose] To obtain a scroll compressor equipped with a scroll that does not leak or wear. [Structure] Inside a closed container 1 having a high-pressure chamber 2 inside, an end plate 3
Fixed scroll 3 in which spiral wrap 3b is erected on a
Is fixed, a spiral wrap 4b is erected on one side of the end plate 4a, and the orbiting scroll 4 provided with the orbiting scroll shaft 4c on the other side is made eccentric to face the wrap. Grooves 3d and 4d are provided at the tips of the wraps 3b and 4b, respectively, and the tip seal 12 is housed in the grooves. Fine holes 13 are formed at appropriate intervals on the bottom surfaces of the grooves 3d and 4d by penetrating the wrap and the end plate, and a large diameter portion 13a is provided at the groove side open end of the fine holes 13 so that the fixed through roll 3 is provided in the high pressure chamber 2. The orbiting scroll 4 communicates with the high pressure chamber 2 via the rear chamber 14.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a scroll compressor, and more particularly to a seal structure.

[0002]

[Prior Art]

 As a scroll compressor of this type according to the conventional example, there is a compressor of a gas body such as Freon shown in FIG. In the figure, in a closed container 1 having a high-pressure chamber 2 inside, a fixed scroll 3 is fixed in which a spiral wrap 3b is erected on an end plate 3a and a discharge hole 3c is formed substantially at the center. Similarly, a spiral wrap 4b is vertically provided on one surface of the end plate 4a, and an orbiting scroll 4 having an orbiting scroll shaft 4c on the other surface is eccentrically arranged by engaging the laps, and between the both wraps. A suction chamber 6 and a discharge chamber 7 are provided on the outer periphery and the center of the compression chamber 5 formed, respectively. On the other hand, a drive bearing 9 is provided at the center of the frame 8 fixed to the fixed scroll 3 at the outer periphery of the orbiting scroll 4 under the thrust load of the orbiting scroll 4, and is supported by the coaxial bearing 9. An eccentric bearing 11 is provided at the upper end of the crankshaft 10 driven by a motor not provided, and the orbiting scroll shaft 4c is inserted into the coaxial shaft 11. FIG. 3 is an enlarged view of a main part. A fixed scroll 3 in which a wrap 3b is erected on an end plate 3a and a revolving scroll 4 in which a wrap 4b is erected on an end plate 4a are arranged by meshing the laps, and the wraps 3b and 4b are provided. Are provided with grooves 3d and 4d at their tips, respectively, and the tip seal 12 is housed in the groove to seal between the facing end plates. An elastic material is used for the tip seal 12, but since it is not always sufficient, it is necessary to press it with a spring or the like. This has the drawbacks that the number of parts is increased and the manufacturing cost is increased, or the seal becomes incomplete due to fatigue of the spring.

[0003]

[Problems to be solved by the device]

 The present invention has been made in view of the above problems of the conventional example, and an object thereof is to provide a compressor including a scroll in which a tip seal is pressed against an end plate without increasing the number of parts.

[0004]

[Means for Solving the Problems]

 In order to solve the above problem, in the present invention, a fixed scroll having a spiral wrap standing on a mirror plate is fixed in a closed container having a high-pressure chamber, and a spiral wrap is also provided on one surface of the mirror plate. And the orbiting scroll with the orbiting scroll shaft on the other side, the orbiting scroll is eccentrically opposed by meshing the wraps, and the tip seal is provided at the wrap tip in a scroll compressor that has a tip seal at the wrap tip. It is characterized in that it is housed in a groove, and a fine hole penetrating the lap and the end plate is bored so that the fine groove communicates with the high-pressure chamber, and that the open end of the fine hole on the groove side has a large diameter.

[0005]

[Action]

 The tip seal is pressed against the end plate by the high pressure gas.

[0006]

【Example】

 An embodiment of the compressor according to the present invention will be described below with reference to FIGS. FIG. 1 is a partial cross-sectional view of this machine, in which a fixed scroll 3 in which a spiral wrap 3b is erected on an end plate 3a is fixed in an airtight container 1 having a high pressure chamber 2 inside. A spiral wrap 4b is erected on one surface and an orbiting scroll 4 having an orbiting scroll shaft 4c on the other surface is eccentrically opposed by engaging the wraps with each other, and a compression formed between the two wraps. A suction chamber 6 and a discharge chamber 7 are provided at the outer periphery and the center of the chamber 5, respectively, a suction pipe 6a is connected to the suction chamber 6, and a discharge hole 3c is formed at substantially the center of the fixed scroll 3 so that the discharge chamber 7 has a high pressure. A flow path communicating with the chamber 2 and further provided with a discharge pipe 1a in the closed container 1 to reach the discharge pipe 1a from the suction pipe 6a through the suction chamber 6, the compression chamber 5, the discharge chamber 7, and the high pressure chamber 2. To form. On the other hand, a drive bearing 9 is provided at the center of the frame 8 fixed to the fixed scroll 3 at the outer peripheral portion thereof, which is located below the orbiting scroll 4 and receives the thrust load, and is supported by the bearing 9. An eccentric bearing 11 is provided at the upper end of a crank shaft 10 driven by a motor, and the orbiting scroll shaft 4c is inserted therein. An Oldham ring (not shown) is arranged between the frame 8 and the end plate 4a of the turning scroll 4. FIG. 2 is an enlarged view of a main part of FIG. And 4b are provided with grooves 3d and 4d at the tips thereof, respectively, and the chip seal 12 is housed in the groove to seal the gap between the facing end plates. On the bottom surfaces of the grooves 3d and 4d, fine holes 13 are formed at appropriate intervals through the wrap and the end plate, and the open end on the groove side has a large diameter portion 13a. The swirl scroll 4 communicates with the high-pressure chamber 2 via the rear chamber 14.

Next, the operation of this compressor will be described. Due to the rotation of the crankshaft 10 which is driven integrally with the rotating shaft of a motor (not shown), the orbiting scroll shaft 4c, which is eccentrically supported, turns in a circle having a radius of this eccentric distance. The orbiting scroll 4 is regulated by an Oldham ring (not shown) so that the orbiting scroll 4 orbits with respect to the fixed scroll 3 so as not to rotate apparently, and one point of each circle forming a wrap almost always comes into contact with the fixed scroll 3. While doing so, a turning motion is performed, and the contact point is continuously moved from the outer circumference to the center. As a result, the gas flowing between the scrolls from the suction pipe 6a through the suction chamber 6 is collected between the wraps of almost the outermost circumference, and the space volume decreases as it is sent to the center by the rotation, so that it is compressed. Then, the high pressure chamber 2 enters the high pressure chamber 2 through the discharge port 3c, and is supplied to an external device through the discharge pipe. A part of the high-pressure gas discharged from the discharge port 3c descends through a communication hole provided along the closed container 1, and passes through an oil hole formed in the crankshaft 10 or a fitting portion of the bearing. The rear chamber 14 at the bottom of the orbiting scroll 4 is reached, and the chamber is maintained at high pressure or medium pressure. Since the pores 13 connect the high-pressure chamber 2 or the back chamber 14 communicating with the high-pressure chamber 2 and the grooves 3d and 4d, the tip seal 12 presses the facing end plate by the pressure to complete the seal. At this time, since the pores 13 have the large diameter portions 13a on the sides of the grooves 3d and 4d, the tip seal 12 is pressed against the wide surface to complete the pressing. Further, this pressure changes in the same manner as the pressure in the compression chamber 5 when the compressor is operated under an overload or in response to a change in high pressure due to a change in operating conditions, so the tip seal 12 presses the end plate. The force is almost constant, a stable seal is obtained, and there is little wear.

[0008]

[Effect of the device]

 As described above, since the pores are provided and the groove is communicated with the high pressure chamber or the back chamber communicating with the same chamber, the large diameter portion is further provided on the groove side of the pore to press the tip seal against the facing end plate. It is possible to obtain the excellent effect of obtaining a highly efficient compressor in which the pressing force is almost constant, there is no leakage, and there is no wear.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a scroll compressor according to the present invention and a conventional example.

FIG. 2 is a sectional view of a main part of a scroll compressor according to the present invention.

FIG. 3 is a sectional view of a main part of a scroll compressor according to a conventional example.

[Explanation of symbols]

 1 Closed Container 2 High Pressure Chamber 3 Fixed Scroll 3a End Plate 3b Wrap 3c Discharge Hole 3d Groove 4 Orbiting Scroll 4a End Plate 4b Wrap 4c Orbiting Scroll Shaft 4d Groove 5 Compression Chamber 6 Suction Chamber 7 Discharge Chamber 9 Drive Bearing 10 Crankshaft 11 Eccentric Bearing 12 Tip seal 13 Pore 13a Large diameter part 14 Rear chamber

Claims (1)

[Scope of utility model registration request] 1. A fixed scroll in which a spiral wrap is erected on an end plate is fixed in a closed container having a high pressure chamber inside,
Similarly, a spiral wrap is erected on one surface of the end plate and an orbiting scroll provided with an orbiting scroll shaft on the other surface is eccentrically opposed by engaging the wraps and the tip end of the wrap is provided with a tip seal. In the machine, the chip seal is housed in a groove provided at the tip of the wrap, and a hole penetrating the wrap and the end plate is bored to communicate the groove with the high pressure chamber, and the groove side open end of the hole is enlarged. A scroll compressor characterized by having a diameter.