JPH10169577A - Rotary compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To always press a blade against a rotating holding member regardless of a position of a piston, to slide the blade stably, and to improve performance by eliminating leakage of compressed gas. SOLUTION: A blade integrally protruded from a roller (20), inserted into a blade sliding groove (12d) of a cylinder (12), and slidably and slidably held by a rotation holding body (22). An inclined surface (21a) is formed on the side surface on the tip side of (21) so as to be inclined at a predetermined angle (α) with respect to the blade projecting direction. The inclined surface (21a) is connected to the piston (19).
Is projected from the rotating holding body (22) to the back side of the blade sliding groove (12d) in a state in which reaches the top dead center.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a rotary compressor provided with a piston having a blade integrally projecting from an eccentrically rotatable roller, and more particularly to a countermeasure for a gap around the blade.

[0002]

2. Description of the Related Art Generally, in a rotary compressor as disclosed in, for example, JP-A-7-27074,
As shown in FIGS. 4A and 4B, the piston (c) disposed in the cylinder chamber (b) of the cylinder (a) is an integral body of the roller (d) and the blade (e). A blade (e) integrally projecting from the roller (d) is inserted into a blade sliding groove (f) formed in the cylinder (a), and a rotary pinch disposed in the blade sliding groove (f). The body (g) is slidably and slidably held by two holding members (h) and (h) constituting the body (g).

The cylinder chamber (b) is partitioned by the blade (e) into a suction chamber (i) and a compression chamber (j).
Eccentric rotation of the roller (d) and the blade (e)
By the sliding and oscillating movement of the gas, the gas is transferred to the suction chamber (i)
While being compressed in the compression chamber (j). In FIG. 4B, the roller (d) is at the top dead center, and the entire cylinder chamber (b) is the suction chamber (i).

[0004]

By the way, FIG. 4 (a)
As shown in the figure, in the compression step immediately before the piston (c) reaches the top dead center, the pressure in the suction chamber (i), which divides the cylinder chamber (b) into two, and the pressure in the compression chamber (j) are compared. Since (j) has a higher pressure than the suction chamber (i),
The blade (e) is moved by the pressure difference (k) to the suction chamber (i).
Is pressed against the holding member (h) on the side, and slides between the two holding members (h), (h) in this state, so that the sliding behavior of the blade (e) is stabilized. Moreover, the blade (e)
Is pressed against the holding member (h) on the suction chamber (i) side, so that no gap is formed between the two, so that the blade passes through the gap between the holding member (h) and the blade (e) from the compression chamber (j). The compressed gas flowing into the sliding groove (f) does not leak to the suction chamber (i), and the performance does not decrease.

However, as shown in FIG. 4B, when the piston (c) reaches the top dead center, the compression chamber (j) disappears and the entire cylinder chamber (b) becomes the suction chamber (i). , The differential pressure (k) as described above does not occur, and therefore the blade (e)
No pressing force acts on the blade (e), and the blade (e) enters a free state, and its sliding behavior becomes unstable. Moreover, when the sliding behavior of the blade (e) becomes unstable,
A gap is formed between the blade (e) and the holding member (h) on the suction chamber (i) side, so that the compressed gas of the compression chamber (j) flowing into the blade sliding groove (f) is released from the suction chamber (i). ), Resulting in reduced performance.

[0006] The present invention has been made in view of such a point, the purpose is to always press the blade against the rotating holding body regardless of the position of the piston, to stably slide the blade, An object of the present invention is to improve performance by eliminating leakage of compressed gas.

[0007]

In order to achieve the above object, the present invention is characterized in that the shape of the blade is devised.

Specifically, as shown in FIG. 1, according to the present invention, a piston (21) having a rectangular plate-shaped blade (21) integrally protruding radially outward from a roller (20) capable of eccentric rotation is provided. 19), and the roller (20) is connected to the cylinder (1).
2) While being disposed in the cylinder chamber (11), the blade (21) is inserted into a blade sliding groove (12d) formed in the cylinder (12) to rotate and hold the rotary holding body (22).
The roller (20) is eccentrically rotated in the cylinder chamber (11) while the blade (21) is slidably oscillated while sliding the cylinder (11). With a blade (21).
1a) and a compression chamber (11b), and a rotary compressor for sucking gas into the suction chamber (11a) and compressing it in the compression chamber (11b) has the following solution.

That is, the first solution of the present invention is to form an inclined surface (21a) on the side surface on the tip side of the blade (21) so as to be inclined at a predetermined angle (α) with respect to the blade projecting direction. . Then, the inclined surface (21a) is projected from the rotary holding body (22) to the back side of the blade sliding groove (12d) when the piston (19) reaches the top dead center. Features.

With the above arrangement, in the first solution of the present invention, the roller (20) is eccentrically rotated in the cylinder chamber (11), and the blade (21) is moved in the blade sliding groove (12d) by the eccentric rotation. ), It is held by the rotating holding body (22) and swings while sliding. Thus, the cylinder chamber (11) is moved by the blade (21) into the suction chamber (11a).
And a compression chamber (11b), and the gas sucked into the suction chamber (11a) is compressed in the compression chamber (11b).

In this case, when the piston (19) reaches the top dead center, the compression chamber (11b) disappears, the entire cylinder chamber (11) becomes the suction chamber (11a), and the compression pressure is applied to the blade (21). An external pressing force based on the pressure difference between the chamber (11b) and the suction chamber (11a) does not act, but the pressure difference between the blade sliding groove (12d) and the suction chamber (11a) causes the blade sliding groove ( 12d) The compressed gas at the back has a flow that flows into the suction chamber (11a) through the gap between the blade (21) and the rotary holding body (22), and this flow is inclined by the blade (21). It acts on the surface (21a) as a pressing force (F), and this pressing force (F) is a component force (f).
1) and (f2).
1) is a force for pressing the blade (21) against the sliding wall of the rotary holding member (22), and thereby the pressing force is secured.

Accordingly, the blade (21) is pressed against the sliding wall of the rotary holding body (22) to slide stably on the sliding wall, and no gap is formed between the two, so that the blade sliding groove ( The leakage of the compressed gas in 12d) to the suction chamber (11a) is prevented, and the performance is improved.

According to a second aspect of the present invention, in the first aspect, the rotary holding member (22) is constituted by two semicircular block-shaped holding members (23) and (23). An inclined surface (23a) is formed on the outer surface of the back side of the blade sliding groove (12d) of one of the holding members (23), (23) with respect to the blade sliding surface. And is formed to be inclined at a predetermined angle (β).

With the above arrangement, in the second solution of the present invention, the flow of the compressed gas at the back of the blade sliding groove (12d) is controlled by the inclined surface (2) formed on one of the holding members (23).
3a) as a pressing force (F), and the pressing force (F) is a resultant force obtained by combining the component forces (f1) and (f2), and the holding member (23) is moved by the blade ( 21) is pressed from the side, and the pressing force is secured.

Therefore, similarly to the above case, the blade (21) slides stably on the rotary holding member (22), and no gap is formed between them, so that the blade sliding groove (12) is formed.
The leakage of the compressed gas in d) to the suction chamber (11a) is prevented, and the performance is improved.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 2 and 3 show the overall structure of a rotary compressor according to an embodiment of the present invention. 2 and 3, reference numeral (1) denotes a casing. The casing (1) has an upper lid (3) at an upper end opening of a cylindrical intermediate cylinder (2) and a lower lid (3) at a lower end opening. A suction pipe (5) for introducing gas into the casing (1) is connected near the lower end of the intermediate cylindrical body (2) while being covered with the inner pipe (4). A discharge pipe (6) for discharging high-pressure compressed gas compressed in the casing (1) to the outside is connected to the upper lid (3).

Near the lower end of the casing (1), a compression mechanism (7) for sucking and compressing gas is arranged corresponding to the suction pipe (5), and above the compression mechanism (7). ) Is arranged so as to occupy substantially the entire area of the internal space. The space (lower lid (4)) at the lower end of the casing (1) is used as an oil reservoir (9) for storing lubricating oil (0), and the other space is used as a storage space (10) for storing compressed gas. ).

The compression mechanism (7) is provided with a cylinder (12) having a cylinder chamber (11) having a circular cross section. On both upper and lower surfaces of the cylinder (12), a boss-shaped bearing ( Front head (13) having 13a)
And a rear head (14) also having a boss-shaped bearing portion (14a) at the center, and a plurality of bolts (15), (1).
5), and are sealed in the cylinder chamber (11). The cylinder (12) is fixed to the inner wall of the intermediate cylinder (2) of the casing (1), and is horizontally and stably supported in the casing (1). In addition, around the bearing part (13a) of the front head (13),
A muffler member (16) is attached with an annular gap.

The cylinder (12) has a suction port (1).
2a) is opened, and the suction pipe (5) communicates with the cylinder chamber (11) through the suction port (12a).
Also, a discharge port (12b) is opened on the side of the suction port (12a) of the cylinder (12), and the discharge port (12b) communicates with a recess (12c) formed on the back side thereof. The recess (12c) is provided with the front head (1).
The through-hole (not shown) formed in 3) communicates with the storage space (10), whereby the cylinder chamber (11) communicates with the storage space (10).

In the recess (12c), a leaf spring-shaped discharge valve (17) is arranged supported by a pin (18) so as to open and close the discharge port (12b).
The compressed gas discharged to 0) is prevented from flowing back into the cylinder chamber (11).

The cylinder chamber (1) of the cylinder (12)
1) is provided with a piston (19).
9) An annular roller (20) having a circular insertion hole (20a), and a rectangular plate-shaped blade (21) integrally protruding radially outward on the side wall of the roller (20). The roller (20) is eccentrically arranged in the cylinder chamber (11) by a crankshaft (26) described later.

The suction port (12) of the cylinder (12)
a) and a protruding port (12b), a blade sliding groove (12d) extending outward in the cylinder radial direction is formed, and a perfect circular expansion is provided in front of the blade sliding groove (12d). A projecting recess (12e) is formed, and the bulging recess (12e) is formed.
In e), two semicircular block-shaped holding members (23), (23) constituting the rotating holding body (22) are arranged so as to be rotatable around the center of rotation (Q). Then, the blade (21) of the piston (19) is inserted into the blade sliding groove (12d) and the holding member (23),
In (23), it is slidably held in the cylinder radial direction from both sides, and swings around its rotation center (Q) by rotation of the rotation holding body (22).

On the other hand, the driving mechanism (8) includes an electric motor composed of a stator (24) and a rotor (25), and the stator (24) has a casing (1).
Is fixedly supported on the inner wall of the intermediate cylinder (2) of the rotor (2).
5) are arranged concentrically inside the stator (24) with a gap in the circumferential direction. Further, the rotor (2)
The upper half portion of the crankshaft (26) is integrally mounted on the inside of the crankshaft (2) so as to rotate about the axis (P).
6) The lower half portion is rotatably fitted and supported by both bearings (13a) and (14a) of the front head (13) and the rear head (14). An oil passage (26a) extending in the axial direction is formed in the crankshaft (26), and a centrifugal oil pump (27) is mounted at the lower end of the crankshaft (26). The oil pump (27) is constantly immersed in the lubricating oil (0) in the oil reservoir (9), and sucks the lubricating oil (0) into the oil passage (26a) in accordance with the rotation of the crankshaft (26). The pressure is supplied to each sliding portion of the compression mechanism (7) and the drive mechanism (8).

An eccentric shaft portion (26b) is formed near the lower end of the crankshaft (26). The eccentric shaft portion (26b) is located in the cylinder chamber (11) and has a roller (20) of a piston (19). ), The roller (20) is eccentrically rotated in the cylinder chamber (11) by rotation about the axis (P) of the crankshaft (26), and the blade is rotated. (21) Cylinder chamber (11)
Is divided into a suction chamber (11a) and a compression chamber (11b). The suction chamber (11a) and the compression chamber (1
The volume of 1b) changes gradually relative to the eccentric rotation of the roller (20), and is located at the top dead center where the roller (20) simultaneously closes the suction port (12a) and the discharge port (12b). At this time, the entire cylinder chamber (11) becomes the suction chamber (11a), while if the roller (20) is located at a position of the bottom dead center 180 ° opposite thereto, the suction chamber (1
1a) and the compression chamber (11b) have a blade (21).
It becomes even after the border.

As shown in FIG. 1, as a feature of the present invention,
The side surface on the tip side of the blade (21) has an inclined surface (21).
a) is formed so as to be inclined at a predetermined angle (α) with respect to the blade projecting direction, and the inclined surface (21a) is in a state where the piston (19) has reached the top dead center (the state of FIG. 1). And from the rotary holding body (22) to the blade sliding groove (12d).
It protrudes to the back side.

Further, two semicircular block-shaped holding members (23), (23) constituting the above-mentioned rotating holding body (22).
One (left side in FIG. 1) of the holding member (23) has an inclined surface (23) on the outer surface on the back side of the blade sliding groove (12d).
a) is formed so as to be inclined at a predetermined angle (β) with respect to the blade sliding surface.

The rotary compressor configured as described above is used, for example, for compressing a refrigerant gas in a refrigerant circuit of an air conditioner. In this case, the refrigerant gas is sucked from the refrigerant gas evaporator into the suction chamber (11a) of the cylinder chamber (11) via the suction pipe (5), and the sucked refrigerant gas is moved by the eccentric rotation of the roller (20). ), And becomes a high pressure state, and is discharged from the protruding port (12b) to the storage space (10) through a gap between the bearing portion (13a) of the front head (13) and the muffler member (16). It is discharged to the condenser via the pipe (6). During this time,
In the compression chamber (11b), the refrigerant gas is compressed in the state of a mixed gas into which the lubricating oil (0) is mixed.
In (0), the lubricating oil (0) is scattered in a mist state, and the mist-state lubricating oil (0) is separated from the refrigerant gas and collected in the oil reservoir (9).

At this time, the blade (21) is
0), the rotary holding member (2) slides between the holding members (23) and (23) of the rotary holding member (22) with the eccentric rotation of (2).
It swings around the rotation center (Q) of 2).

In the compression step immediately before the piston (19) reaches the top dead center, the compression chamber (11) on the high pressure side is used.
b) and the pressure difference between the suction chamber (11a) on the low pressure side (FIG. 4).
(A)) to move the blade (21) into the suction chamber (11).
a) The pressing member is pressed against the holding member (23) on the side a), and the pressing force causes no gap between the blade and the blade (21).
Can be stably slid, and the performance can be improved by eliminating the leakage of the refrigerant gas from the blade sliding groove (12d).

When the piston (19) reaches the top dead center, the entire cylinder chamber (11) becomes a suction chamber (11a), so that the blade (21) has a compression chamber (11b) and a suction chamber (11a). ) Does not act on the side due to the pressure difference between the blade sliding groove (12d) and the suction chamber (11).
Due to the pressure difference between the blade (21) and the rotary holding body (22), a flow tends to flow into the suction chamber (11a) through the gap between the blade (21) and the rotation holding body (22). 21a) as a pressing force (F). The pressing force (F) is a resultant force obtained by combining the component forces (f1) and (f2), and the component force (f1) is the blade (21).
Is pressed against the sliding wall of the rotary holding body (22),
The pressing force can be secured by this component force (f1).

Thus, the blade (21) is pressed against one of the holding members (23) (right side in FIG. 1), and the holding member (2) is pressed.
3) and (23) can be stably slid, and there is no gap between the two to prevent the refrigerant gas in the blade sliding groove (12d) from leaking into the suction chamber (11a). Performance can be improved.

The component force (f1) of the refrigerant gas in the blade sliding groove (12d) is determined by the slope (2) of the holding member (23).
3a), the component (f1) can press the blade (21) from the side by the holding member (23) to secure the pressing force.

Therefore, also in this case, similarly to the above case, the holding members (23), (2) of the blade (21) are provided.
3) It is possible to stabilize the sliding with respect to
By eliminating the gap between the two, it is possible to prevent the refrigerant gas from leaking into the suction chamber (11a) and improve the performance.

[0035]

As described above, according to the present invention,
An inclined surface (21a) is formed on a side surface on the tip side of the blade (21) so as to be inclined at a predetermined angle (α) with respect to the blade protruding direction, and the piston (19) is formed on the inclined surface (21a) by a top dead center. When the piston (19) reaches the top dead center, the blade sliding groove (12d) projects from the rotating holding body (22) to the back of the blade sliding groove (12d). A compressed gas flow is introduced into the blade (21) in 12d).
Acting as a pressing force (F) on the inclined surface (21a) of
The pressing force can be secured by the component force (f1). In addition, the blade (21) is pressed against the rotating holding body (22) on the absorption chamber (11a) side without a gap, and stable sliding and leakage of the compressed gas can be eliminated to improve the performance.

[Brief description of the drawings]

FIG. 1 is a plan view showing a mounted state of a blade on a rotary holding member when a piston reaches a top dead center in a rotary compressor according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing an entire configuration of the rotary compressor.

FIG. 3 is a sectional view taken along the line III-III in FIG. 2;

4A and 4B show a conventional example, in which FIG. 4A is a plan view showing a state in which a blade is mounted on a rotary holding member immediately before the piston reaches a top dead center, and FIG. It is a top view which shows the mounting state of the blade with respect to the rotation holding body.

[Explanation of symbols]

 (11) Cylinder chamber (11a) Suction chamber (11b) Compression chamber (12) Cylinder (12d) Blade sliding groove (19) Piston (20) Roller (21) Blade (22) Rotating holding body (23) Holding member (21a), (23a) Inclined surface

Claims (2)

[Claims] An eccentrically rotatable roller (20) is provided with a piston (19) in which a rectangular plate-shaped blade (21) is integrally protruded radially outward, and said roller (20) is connected to a cylinder (12). ) Is disposed in the cylinder chamber (11), and the blade (21) is arranged in the blade sliding groove (1) formed in the cylinder (12).
2d), and slidably and slidably hold the rotary holding body (22). The roller (20) is eccentrically rotated in the cylinder chamber (11) and the blade (21) is slid while sliding. By moving the cylinder chamber (11), the blade (21) partitions the cylinder chamber (11) into a suction chamber (11a) and a compression chamber (11b). The gas is sucked into the suction chamber (11a), while the compression chamber (11b) is moved. A rotary compressor that compresses at an inclined surface (21)
a) is formed so as to be inclined at a predetermined angle (α) with respect to the blade projecting direction, and the inclined surface (21a) is formed by the rotation holding body when the piston (19) reaches the top dead center. A rotary compressor characterized in that it protrudes from (22) to the inner side of the blade sliding groove (12d). 2. The rotary holding body (22) is composed of two semicircular block-shaped holding members (23), (23), and holds one of the holding members (23), (23). An inclined surface (23a) is formed on the outer surface of the member (23) on the back side of the blade sliding groove (12d) so as to be inclined at a predetermined angle (β) with respect to the blade sliding surface. The rotary compressor according to claim 1, wherein: