JP3764516B2 - Compressor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a compressor used for an air conditioner for vehicles.
[0002]
[Prior art]
FIG. 3 is a longitudinal sectional view of a conventional scroll compressor. In the figure, reference numeral 1 denotes a hermetic housing comprising a cup-shaped main body 2, a cover 4 fastened to the cup-shaped main body 2 by a bolt 3, and a cylindrical member 6 fastened to the cup-shaped main body 2 by a bolt (not shown). A rotating shaft 7 passing through the cylindrical member 6 is rotatably supported by the housing 1 via bearings 8 and 9.
[0003]
A fixed scroll 10 and a turning scroll 14 are disposed in the housing 1. The fixed scroll 10 includes an end plate 11 and a spiral wrap 12 erected on the inner surface thereof, and the end plate 11 is fastened to the cup-shaped main body 2 by bolts 13. The housing 1 is partitioned by bringing the outer peripheral surface of the end plate 11 and the inner peripheral surface of the cup-shaped main body 2 into close contact, a high-pressure side 31 is formed on the outer side of the end plate 11, and a low-pressure side is formed on the inner side of the end plate 11. Side 28 is limited. On the other hand, a suction chamber 32 and a discharge chamber 33 are formed at the joint between the cover 4 and the cup-shaped body 2, the high pressure side 31 communicates with the discharge chamber 33 through a passage (not shown), and the low pressure side 28 directly connects to the suction chamber 32. Communicating with A discharge port 29 is formed in the center of the end plate 11, and the discharge port 29 is opened and closed by a discharge valve 30. The orbiting scroll 14 includes an end plate 15 and a spiral wrap 16 standing on the inner surface thereof, and the spiral wrap 16 has substantially the same shape as the spiral wrap 12 of the fixed scroll 10. ing.
[0004]
The orbiting scroll 14 and the fixed scroll 10 are engaged with each other as shown in the drawing while being eccentric with respect to each other by an orbiting radius and shifted by an angle of 180 °. Thus, the tip seal 17 embedded in the tip surface of the spiral wrap 12 is in close contact with the inner surface of the end plate 15, and the chip seal 18 embedded in the tip surface of the spiral wrap 16 is in close contact with the inner surface of the end plate 11. The side surfaces of the spiral wound wraps 12 and 16 are in line contact with each other at a plurality of locations to form a plurality of compression chambers 19a and 19b that are substantially point-symmetric with respect to the center of the spiral.
[0005]
A drive bush 21 is rotatably fitted in a cylindrical boss 20 projecting from the center of the outer surface of the end plate 15 via a swivel bearing 23, and inside a slide groove 24 formed in the drive bush 21. An eccentric drive pin 25 that is eccentrically projected from the inner end of the rotary shaft 7 is slidably fitted. The drive bush 21 is provided with a balance weight 27 for balancing the dynamic unbalance due to the orbiting motion of the orbiting scroll.
[0006]
Reference numeral 36 denotes a thrust bearing interposed between the outer peripheral edge of the end plate 15 and the inner surface of the cylindrical member 6, and reference numeral 26 denotes a rotation consisting of an Oldham joint that allows the orbiting scroll to rotate but prevents its rotation. A blocking mechanism 35 is a balance weight fixed to the rotating shaft 7. Thus, by joining the electromagnetic clutch 37, power from a travel engine (not shown) is transmitted to the rotary shaft 7 via the belt 38 and the electromagnetic clutch 37.
[0007]
When the rotary shaft 7 is rotated, the orbiting scroll 14 is driven via an orbiting drive mechanism including an eccentric pin 25, a drive bush 21, a boss 20 and the like, and the orbiting scroll 14 is prevented from rotating by the rotation preventing mechanism 26 while being turned. In other words, the rotary shaft 7 and the eccentric drive pin 25 make a turning motion on a circular orbit having a radius of eccentricity. Then, the line contact portions on the side surfaces of the spiral wraps 12 and 16 gradually move toward the center of the spiral, and as a result, the compression chambers 19a and 19b move toward the center of the spiral while reducing the volume. Along with this, gas flowing into the low pressure side chamber 28 from the suction port (not shown) through the suction chamber 32 is taken into the compression chambers 19a and 19b from the outer peripheral end openings of the spiral wraps 12 and 16 and compressed. It reaches the central chamber 22, passes through the discharge port 29, pushes and opens the discharge valve 30 to be discharged to the high pressure side 31, passes through the discharge chamber 33, and flows out from there through a discharge port (not shown).
[0008]
During the orbiting motion of the orbiting scroll 14, the orbiting scroll 14 is subjected to a centrifugal force directed in the eccentric direction and a gas force due to the compressed gas in the compression chambers 19 a and 19 b. The side surface of the wrap 16 is in close contact with the side surface of the wrap 12 of the fixed scroll 10 to prevent gas leakage in the compression chambers 19a and 19b. As the side surface of the wrap 12 and the side surface of the wrap 16 slide in close contact with each other, the turning radius of the orbiting scroll 14 automatically changes, and accordingly, the eccentric drive pin 25 moves in the slide groove 24. Slide along its longitudinal direction. 50 is a relief valve, and 55 is a cover.
[0009]
FIG. 4 is an enlarged two-side view of the relief valve, wherein (a) is a plan view and (b) is a side view. 5A and 5B are enlarged two-side views of the cover, in which FIG. 5A is a side view and FIG. 5B is a cross-sectional view taken along line BB in FIG. Reference numeral 50 denotes a relief valve, which discharges gas from the holes 51 and 54 to the outside of the compressor when the gas pressure in the discharge chamber 33 rises due to the force of the spring 53 pushing the valve body 52. During normal operation where the gas pressure is lower than the force of the spring 53, the valve body 52 is closed. Reference numeral 56 denotes an O-ring for connecting the relief valve 50 to the cover 4 without gas leakage. Reference numeral 55 denotes a cover for blocking the gas flow and diffusing in all directions when the gas pressure in the discharge chamber 33 rises abnormally, the valve body 52 opens, and the gas is ejected to the outside through the hole 54.
[0010]
[Problems to be solved by the invention]
In the conventional scroll type compressor described above, since the compressor is mounted on the engine, when the gas is ejected from the relief valve 50 at the time of inspection and service of the engine room, if the cover 55 is not present, the gas directly hits people. is there. In other words, from the viewpoint of safety, it is essential to equip the cover 55 for diffusing the flow during gas ejection in all directions. Further, since the relief valve 50 protrudes outward from the engine, when the compressor is mounted on the engine, it may come into contact with other components in the engine room and may be difficult to mount.
[0011]
The present invention seeks to provide a compact compressor that eliminates the above-mentioned drawbacks of the prior art, eliminates the cover for ensuring safety during gas ejection, and eliminates the protrusion of the relief valve.
[0012]
[Means for Solving the Problems]
The present invention solves the above-described problem, and provides a mounting leg portion having a bolt hole on the outer periphery of a housing in which a compression mechanism is incorporated, and the mounting leg portion is attached to an object to be installed via a mounting bolt. The compressor relates to a compressor having the following characteristics.
(1) to a relief valve for releasing the gas when the gas is abnormally high pressure within the housing to the outside, to a position where the emitted gases impinge on the mounting bolts, installed through the outer wall of the housing .
(2) The compressor according to (1), wherein the compressor is mounted on a traveling engine and driven by the engine.
(3) The compressor according to (1) or (2), wherein the compressor is a scroll-type compressor in which a discharge chamber is formed on one end side in the housing, and the relief valve is connected to the discharge chamber. in a position penetrating, and, that the released gas is installed at a position impinging on the mounting bolt.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a longitudinal sectional view of a scroll compressor according to an embodiment of the present invention, FIG. 2 is a two-side view of a relief valve used in the compressor, (a) is a plan view, and (b). Is a side view. In FIG. 1, reference numeral 50 </ b> A is a relief valve having a reduced height, and is connected to the housing 1 via an O-ring 56. Reference numeral 59 denotes a hole formed in the housing 1 for mounting the relief valve 50A, and opens to the high pressure side 31. Reference numeral 60 denotes a bolt hole for mounting the compressor on an engine (not shown) with four bolts. Although not shown, the four bolts pass through the hole 60 and are fastened over the relief valve 50. FIG. 2 shows a relief valve 50A having a low height, (a) showing the upper surface and (b) showing the side surface. 51 is a hole through which gas passes, 52 is a valve body, and 53 is a spring for pressing the valve body 52. 54 is a hole for discharging gas to the outside of the compressor, 57 is a gas passage around the valve body, and 58 is a gasket for sealing the valve body.
[0014]
The relief valve 50A shown in FIG. 2 is reduced in size by shortening the length of the gas inlet hole 51. The total length of the conventional relief valve 50 (FIG. 4) is about 30 mm, whereas the total length is about 30 mm. The height is reduced to 20 mm and the height is reduced by about 10 mm.
[0015]
In this embodiment, when the pressure of the gas on the high pressure side 31 becomes abnormally high, the gas pushes the valve body 52 shown in FIG. 2 and is ejected from the hole 54 to the outside of the compressor. The ejected gas collides with a bolt (not shown) that passes through the bolt hole 60, ie, a bolt hole 60, and fastens the compressor to the engine, and the jet flow is diffused. For this reason, it is safe for those who check and service the engine room. As a result, the conventionally used cover shown in FIG. 5 can be omitted. In addition, by placing the relief valve 50 with a low height in the dead space under the bolt, the relief valve does not protrude after the compressor is mounted on the engine. It became.
[0016]
【The invention's effect】
In the compressor of the present invention, when the gas in the housing is abnormally high in pressure, the relief valve that releases the gas to the outside is downsized, and the relief valve is placed at the position where the released gas collides with the mounting bolt. Since no outer cover is installed, no cover is required and the relief valve does not protrude, and the compressor can be made compact.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a scroll compressor according to an embodiment of the present invention.
FIG. 2 is a two-side view of a relief valve used in the embodiment, wherein (a) is a plan view and (b) is a side view.
FIG. 3 is a longitudinal sectional view of a conventional scroll compressor.
FIG. 4 is a two-side view of a relief valve used in the compressor, wherein (a) is a plan view and (b) is a side view.
FIG. 5 is a two-side view of a cover used in the relief valve, in which (a) is a side view and (b) is a cross-sectional view.
[Explanation of symbols]
50, 50A Relief valve 51 Hole 52 Valve body 53 Spring 54 Gas discharge hole 55 Cover 56 O-ring 57 Gas passage 58 Gasket

Claims (3)

In a compressor in which a mounting leg having a bolt hole is provided on the outer periphery of a housing in which a compression mechanism is incorporated, and the mounting leg is attached to an object to be installed via a mounting bolt, the gas in the housing has an abnormally high pressure. when compressor a relief valve for releasing the gas to the outside, to a position where the emitted gases impinge on the mounting bolts, characterized in that installed through the outer wall of the housing.   The compressor according to claim 1, wherein the compressor is a compressor for vehicle air conditioning that is mounted on a driving engine and driven by the engine. The compressor is a scroll type compressor in which a discharge chamber is formed on one end side in the housing , and the released gas collides with the mounting bolt at a position passing through the discharge valve through the discharge chamber. The compressor according to claim 1 or 2, wherein the compressor is installed at a position .

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