JPH0223286A - Scroll compressor - Google Patents

Abstract

PURPOSE:To prevent abnormal wear of a seal member due to a fluid bypass hole, to improve performance, and to reduce a cost by a method wherein a gap regulating element is securely pressed in the portion, sliding the fluid bypass hole, of a seal means, and a vertically movable tip seal is mounted to the other part thereof. CONSTITUTION:A gap regulating element 301 is pressed in and secured to a recessed groove 201, a down force due to the pressure of a fluid bypass hole 14 is exerted on the gap regulating element even when the element is interfered with the bypass hole 14, and no force in the direction of the bypass direction 14 is exerted. As a result, the gas regulating element 301 is not deformed upward, and wear due to friction with the peripheral edge of the fluid bypass hole 14 is not produced. The portion, not positioned facing the fluid bypass hole 14, of a seal means employs a tip seal 202 vertically movable in the recessed groove 201 as in a conventional type. This is because easy and reliable axial seal is performed, and provided the whole of the seal part is securely pressed in the recessed groove 201, there is a need to regulate height to an uniform value throughout the whole surface and an assembly cost is increased.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a scroll compressor.

[Conventional technology]

FIG. 3 shows a scroll compressor consisting of a conventional totally hermetic refrigerant compressor proposed in, for example, the specification of Tokukai No. 61-283406. In the figure, 1 is a fixed scroll; A spiral projection 1b is provided on the lower surface, and a chip seal 102 is inserted into a groove 101 formed on the end surface of the spiral projection 1b.

2 is an oscillating scroll, and a spiral protrusion 2 is provided on the upper surface of the base plate portion 2a.
b is provided, and a chip seal 202 is inserted into a groove 201 formed on the end surface of this spiral protrusion 2b. Note that the tip seal 102.202 is made of PTFB with good self-lubricating properties.
Synthetic resin materials such as Further, a swing shaft portion 2C protrudes from the lower part of the center portion of the base plate portion 2a. 5 is each spiral protrusion 1b.

2b is a compression chamber formed by combining them, 3 is each scroll 1
, 2 is a suction port formed on the outer periphery of 2, 4 is a fixed scroll l
A discharge port 6 is a main shaft provided in the center of the base plate portion 1a, and an eccentric hole 6b is provided in the large diameter portion 6a at the upper end. Reference numeral 7 is a swing bearing that is fitted into the eccentric hole 6b and supports the swing shaft portion 2c in the radial direction; 8°; 9 is a motor rotor and motor stator that drive the main shaft 6; and 10 is a swing bearing that swings when the main shaft 6 is driven. An Oldham joint that restricts the scroll 2 to revolve without rotating; 11 is an airtight container that accommodates each component;
12 is a suction pipe fixed to the closed container 11, and 13 is a discharge pipe fixed to the fixed scroll 1, which sends the compressed gas from the discharge port 4 to the outside of the closed container 11. 25 supports the fixed scroll 1, and also supports the swinging scroll 2 in a recess 25a so as to swing freely, and is provided with an Oldham joint 10.
The bracket rotatably supports the large diameter portion 6a of the main shaft 6 via the bearing 26, and is used to connect the oil return hole 25b and the gas passage 2.
It has 5c. 27 is a bracket that supports the motor stator 9 and rotatably supports the main shaft 6, and includes an oil return hole 27a and gas passages 27b, 2
It has 7c. 6c is an eccentric oil supply hole provided eccentrically through the main shaft 6, 28 is an oil cap attached to the lower end of the main shaft 6, and 29 is lubricating oil.

In the conventional scroll compressor described above, when the motor rotor 9 rotates, the main shaft 6 rotates, and the oscillating scroll 2 rotates.
revolves while being prevented from rotating by Oldham's joint 10. As a result, the gas passage 27c from the suction pipe 12,
Suction gas is introduced into the compression chamber 5 through the suction ports 27 b and 25 c and the suction port 3 , is gradually compressed, and is discharged from the discharge port 4 into the discharge pipe 13 .

In a scroll compressor that performs compression from the compression chamber on the outer circumference toward the discharge port 4 on the inner circumference, in order to provide good compression efficiency, the end face of the scroll side plate is placed opposite to this end face. A sealing means is provided between the scroll end plate and the scroll end plate. Various types of sealing means have been known in the past, and among these, chip seals are often used because they have a self-compensating function against increases in gap changes due to wear, machining errors, or thermal deformation.

Conventionally, scroll compressors equipped with this type of chip seal have been disclosed in U.S. Pat.
It is disclosed in Japanese Patent Publication No. 201, Japanese Patent Publication No. 56-28240, etc.

Among these, the sealing means disclosed in U.S. Patent No. 801182 inserts a sealing member into a concave groove provided in the end face of a scroll side plate along the spiral direction, and this sealing member is moved in the axial direction by a spring. This seals the shaft in the axial direction.

Further, the sealing means disclosed in Japanese Patent Publication No. 56-28240 provides a concave groove in which the sealing member is fitted on the end face of the scroll side plate, and opens one end of this concave groove to the high pressure area at the center of the spiral. The seal member is urged in the axial direction by high pressure fluid introduced from the opening between the groove and the seal member to perform axial sealing.

Further, the sealing means disclosed in Japanese Utility Model Application Publication No. 62-76201 sets the groove width of the groove provided on the end face of the scroll side plate to be larger than the width of the sealing member, thereby sealing the groove and the groove. The high-pressure fluid being compressed flows into the groove from the gap formed between the members to achieve axial sealing.

Next, such sealing means will be described in FIGS. 6 and 7.
This will be explained using figures. In the same figure, the oscillating scroll 2
is a spiral protrusion 2 having a groove 201 extending in the spiral direction.
b and a scroll base plate portion 2a provided on the lower end surface of the spiral protrusion 2b. Reference numeral 202 denotes a chip seal that partially faces inside the groove 201, and its width is formed to be slightly smaller than the width of the groove. )
is provided in between. Further, 203 is a communication port that communicates with the inside of the groove 201 and the high pressure region at the center of the spiral. In the chip seal configured in this way, as shown in FIG. A high-pressure fluid (not shown) flows in to form the gap 204, and presses the tip seal 202 from below in the axial direction to obtain a seal.

Further, in FIG. 5, 14 is a fluid bypass hole provided in the base plate portion 1a of the fixed scroll 1, 15 is a valve seat formed around the fluid bypass hole 14, and 16 is a valve seat also provided in the base plate portion 1a. One end opens to the outside of the fixed scroll 1 communicating with the suction pressure space, and the other end communicates with a slit 23 formed concentrically around the fluid bypass hole 14.

Reference numeral 17 denotes a bypass valve, which is, for example, a circular plate-shaped valve made of hardened and polished steel plate used as a valve material for a refrigerant compressor. A valve seat plug 18 closes the upper part of the valve seat 15 and serves as a stopper for the bypass valve 17. 19 is a valve seat space between the valve seat 15 and the valve seat plug 18, 20 is a communication hole provided in the center of the valve seat plug 18, and 21 is a valve for guiding suction pressure and discharge pressure by switching a three-way solenoid valve (not shown) or the like. This is pressure piping, and is fixed to the conduction hole 20 of the valve seat plug 18 and the piping hole 22 of the closed container 11 by brazing or the like. In a scroll compressor, a fixed scroll 1 and an oscillating scroll 2 are combined to form a plurality of symmetrical pairs of compression chambers 5 at the same time, so the fluid bypass holes 14 are also symmetrical corresponding to at least one pair of compression chambers 5. It is necessary to install a pair at appropriate locations.

Furthermore, in FIG. 5, a slit 23 is formed concentrically on the outside of the fluid bypass hole 14, and the fluid bypass hole 14 and the discharge hole 1 are connected to each other via the slit 23 and the valve seat space 19.
6 should be connected.

In addition, a coil spring 24 is provided in the slit 23 so that when the pressure in the valve seat space 19 becomes low, the bypass valve 17 is smoothly pushed up and comes into close contact with the valve seat plug 18 to prevent the bypass valve 17 from flapping. to be placed.

In this conventional scroll compressor, when the compressor is operated at maximum capacity without capacity control, a three-way solenoid valve (not shown) or the like is switched to guide the discharge pressure to the outer end of the pressure pipe 21. As a result, the pressure in the valve seat space 19 becomes the discharge pressure,
When the discharge pressure acts on the bypass valve 17, the bypass valve 17 is pressed downward and comes into close contact with the valve seat 15, and the discharge hole 16 communicating with the fluid bypass hole 14 and the slit 23 is simultaneously closed by the bypass valve 17, and the compression chamber is closed. The fluid No. 5 is discharged to the outside of the compressor via the discharge pressure 14 and the discharge pipe 13.

When controlling the capacity of the compressor, suction pressure is introduced to the outer end of the pressure pipe 21 by switching a three-way solenoid valve (not shown) or the like. Thereby, the pressure in the valve seat space 19 becomes the suction pressure. Since the fluid bypass hole 14 is provided in the middle of the compression process of the compression chamber 5, the compression chamber 5 communicating with the fluid bypass hole 14
pressure is higher than suction pressure. Further, as described above, the coil spring 24 is attached so as to push up the bypass valve 17. Therefore, the bypass valve 17 is pushed upward and held in contact with the valve seat plug 18, and the fluid bypass hole 14 and the discharge hole 16 communicate with each other, so that a part of the fluid in the compression chamber 5 is transferred to the fluid bypass hole 14 and the discharge hole 16. It is discharged through the discharge hole 16 to the outside of the fixed scroll 1 communicating with the suction space, and the compression capacity in the compression chamber 5 is controlled. The capacity of the fluid discharged to the outside of the fixed scroll 1 is determined by the fluid bypass hole 14.
diameter and number of slits, cross-sectional area and number of slits 23, diameter and number of discharge holes 16, and spiral protrusion 1b of fixed scroll 1.
It can be controlled by the position relative to the The position of the fluid bypass hole 14 is from the most upstream position where the compression chamber 5 is formed after fluid confinement is completed by the fixed scroll 1 and the oscillating scroll 2 to just before the compression chamber 5 communicates with the discharge port 4. It is possible to move within a range of positions.

[Intelligence R to be Solved by the Invention] By the way, in a conventional compressor having a fluid bypass hole on the fixed scroll, the fluid bypass hole 14a seen from the base plate of the fixed scroll as shown in FIG. 8(a), Φ) .

14b, the spiral protrusions 1b, 2b, the compression chambers 51, 52, and the chip seal 202. From figure (a) to figure (b1), the oscillating scroll 2 performs a revolution clockwise, and (rotation) ) In the figure, the compression stroke has progressed more than in figure (a).Here, we will particularly explain the left side fluid bypass hole 14a.In figure 8(b), the inner periphery of the tip seal 202 of the orbiting scroll 2 and the fluid Although the positional relationship is shown in which the bypass holes 14a touch at point A, the fluid bypass holes 14
The pressure in the compression chamber 51 on the discharge port 4 side is set to 52 ps.
Let the pressure be P. As is clear from this figure, the volume of the compression chamber Psi>Psi. Here, FIG. 9 shows the pressure distribution applied to the tip seal 202 of the oscillating scroll 2 in the IX-IX line cross section of FIG. 8(b), and FIG. 10 shows the XX cross section of FIG. Indicated. 9th
As shown in the figure, the chip seal 202 has pressure ps+ on the right side and bottom surface within the groove 201, P%R1 on the top surface, and groove 20 on the left side.
The protruding portion from 1 is under a pressure of Ps□, the upper end of the groove is under a pressure of psz, and the lower end is under a pressure of PSL, which changes linearly. Therefore, since P s+ > P sz, the chip seal 20
2 is pressed toward the upper fluid bypass hole 14 a and pressed against the left side surface of the groove 201 . Also in FIG. 10, the chip seal 202 is caused by the pressure PSL in the gap 204 of the groove 201 to increase the pressure in the fluid bypass hole 14 (pressure Psg).
is being pressed against.

Therefore, as shown in FIG. 11, the tip seal 202 is deformed to fit into the fluid bypass hole 14a as described above.

Therefore, when the conventional chip seal 202 is used and the fluid bypass hole 14 is provided in the fixed scroll base plate portion 1a,
During the compression stroke, the chip seal 202 closes the fluid bypass hole 1.
48i, the tip seal 202 is bent into the fluid bypass hole 14 as shown in FIG. There is a problem in that the bent portion is scraped off at the edge surface of the fluid bypass hole 14 on the side communicating with the compression chamber when it is again pressed against the fixed scroll base plate portion 1a. In particular, when the tip seal 202 is made of self-lubricating PTFE-based synthetic resin, its elastic modulus is small and its deflection is large.
Wear of the portion that interferes with the fluid bypass hole 14 progresses quickly because the edge surface of the fluid bypass hole 14 is largely scraped off.

The part of the tip seal 202 that interferes with the fluid bypass hole 14 is abnormally worn by the edge surface of the fluid bypass hole 14 (and the tip seal 202 eventually loses its thickness and is cut off). , there was a risk of performance deterioration due to seal failure.

This invention was made to solve the above-mentioned problems, and aims to provide a scroll compressor that can eliminate abnormal wear of the tip seal and maintain performance for a long time.

[Means to solve the problem]

The scroll compressor according to the present invention includes a fixed scroll in which a spiral protrusion is provided at the lower part of the base plate part and a discharge port is provided in the center of the base plate part, and a fixed scroll in which the spiral protrusion is provided on the base plate part and the spiral protrusion is provided in the center of the base plate part. An oscillating scroll in which a protrusion is combined with a volute protrusion of a fixed scroll to form a compression chamber, an end face of the fixed scroll volute protrusion that abuts the oscillating scroll base plate portion and an end face of the oscillating scroll volute protrusion that abuts the oscillating scroll base plate portion; In a scroll compressor that compresses fluid in a compression chamber by swinging an oscillating scroll, a sealing means is provided in grooves formed on each end surface that abuts, and a sealing means is provided on the base plate of a fixed scroll to switch between suction pressure and discharge pressure. A fluid bypass hole that is provided in the base plate of the fixed scroll and communicates the compression chamber and the valve seat space before communicating with the discharge port, and a fluid bypass hole that is formed outside the fluid bypass hole. a discharge hole provided in a fixed scroll base plate communicating with a fluid bypass hole through a concentric slit and a valve seat space;
A bypass valve provided in the valve seat space that closes the fluid bypass hole and the discharge hole when discharge pressure is introduced and opens the fluid bypass hole when suction pressure is introduced, and a bypass valve installed in the slit. The seal means includes a push-up coil spring, and the sealing means has a gap adjustment element made of a synthetic resin material press-fitted into the groove in the part that slides on the fluid bypass hole, and a gap adjustment element made of a synthetic resin material in the part that does not come into contact with the fluid bypass hole. A chip seal is provided in a groove so that it can be moved upwards and upwards.

[Function] In this invention, the gap adjusting element press-fitted and fixed in the groove corresponding to the fluid bypass hole does not deform toward the fluid bypass hole, therefore, wear does not occur, and the gap adjustment element is fixed in the axial direction. The seal can be ensured.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings. 1st
The figure is a perspective view of the end face of the oscillating scroll spiral protrusion of the scroll compressor according to the present invention.
Reference numeral 1 denotes a gap adjustment element made of synthetic resin that is press-fitted into a groove 201 formed on the end surface of the spiral protrusion 2b of the orbiting scroll 2, and is provided in a portion that slides into the fluid bypass hole 14. In addition, the same chip seal 20 as before is installed in the groove 201 portion that does not correspond to the fluid bypass hole 14.
2 is a provision.

FIG. 2 shows a cross-sectional plan view of the sliding scroll, showing the relationship between the gap adjustment element 301 and the chip seal 202 and the fluid bypass hole 14, and FIG.
4 shows a sectional view taken along the line IV-mV in FIG. 3.

In the scroll compressor configured as described above, as shown in FIGS. 3 and 4, the gap I'Jl adjustment element 301
is press-fitted and fixed in the groove 201. Therefore, even if the gap adjustment element 301 interferes with the fluid bypass hole 14, it mainly receives a downward force due to the pressure of the bypass hole, and no force acts in the direction of the bypass hole. As a result, the gap adjustment element 301 is not deformed upward, and wear due to friction with the periphery of the fluid bypass hole 14 does not occur. Similarly, a chip seal 202 that is movable in the vertical direction within the groove 201 is used. This is because axial sealing can be performed easily and reliably, and if the entire seal member is press-fitted and fixed into the groove 201, it is necessary to adjust the entire surface of the seal member to a uniform height, which increases the assembly cost. Therefore, the above configuration is adopted.

〔Effect of the invention〕

As explained above, according to the present invention, among the sealing means inserted into the concave groove formed on the end face of the spiral protrusion of the oscillating scroll, the gap adjustment element is press-fitted and fixed in the part that slides in the fluid bypass hole, and the other part is press-fitted and fixed. A tip seal that can move upward and downward is installed in the section, which prevents abnormal wear of the seal member due to the fluid bypass hole.This allows for improved performance and low-cost scroll compression. You can get a chance.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the end face of the oscillating scroll volute protrusion of a scroll compressor according to an embodiment of the present invention, and FIG. 2 shows the compression chamber formed by the volute protrusion, the fluid bypass hole, the clearance adjustment element, and the chip seal. A cross-sectional plan view showing the positional relationship, Figure 3 is a sectional view taken along the line ■-■ in Figure 2, and Figure 4 is a cross-sectional view of Figure 3.
5 is a sectional view of a conventional scroll compressor, FIGS. 6 and 7 are a plan view and a sectional view of a conventional oscillating scroll, and FIGS. bl is an operational explanatory diagram showing the relationship between the compression chamber and the fluid bypass hole by the conventional fixed and oscillating scroll Q spiral protrusions, FIG. 9 is a sectional view taken along the line IX-IX in FIG. 8, and FIG. 10 is FIG. FIG. 11 is a cross-sectional view similar to FIG. 10 showing the deformation of the conventional chip seal that interferes with the fluid bypass hole. 1...Fixed scroll, 1a...Bed plate Part, 1b...
- Spiral protrusion, 2... Oscillating scroll, 2a... Base plate portion, 2b... Spiral protrusion, 3... Suction port, 4... Discharge port, 5... Compression chamber, 14. ...Fluid bypass hole, 1
6... Discharge hole, 17... Bypass valve, 19... Valve seat space, 23... Slit, 24... Coil spring,
101, 201...Concave groove, 102°202...Chip seal, 301...Gap adjustment element. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] A fixed scroll in which a spiral protrusion is provided at the bottom of the base plate part and a discharge port in the center of the base plate part; and an oscillating scroll that forms a compression chamber in combination with the oscillating scroll. In a scroll compressor in which a sealing means is provided in a concave groove and fluid in a compression chamber is compressed by the oscillation of an oscillating scroll, a valve seat is provided on the base plate of a fixed scroll and introduced to be able to switch between suction pressure and discharge pressure. A fluid bypass hole that communicates between the space and the valve seat space and a compression chamber that is provided in the base plate of the fixed scroll and communicates with the discharge port, and a concentric slit and the valve seat that are formed on the outside of the fluid bypass hole. A discharge hole provided in the fixed scroll base plate that communicates with the fluid bypass hole through a space and a discharge hole provided in the valve seat space close the fluid bypass hole and the discharge hole when the discharge pressure is introduced, and reduce the suction pressure. The sealing means includes a bypass valve that opens the fluid bypass hole when the fluid bypass hole is introduced, and a coil spring that pushes the bypass valve into the slit, and the portion of the sealing means that slides over the fluid bypass hole is made of a synthetic resin material. A scroll compressor characterized in that a gap adjustment element is press-fitted into a groove, and a chip seal made of synthetic resin is provided in a portion not in contact with a fluid bypass hole so as to be movable upward and downward within the groove.