JP2002147375A - Rotary compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain generation of an abnormal sound and abnormal abrasion, and to expand a service condition of a compressor by actively supplying oil to rocking bush clearance and blade clearance even when an oil level of an oil reservoir lowers. SOLUTION: An oil pocket 15 is arranged on a front head 9, the oil existing in a refrigerant delivery space 13b is gathered, and the oil gathered in the oil pocket 15 is supplied to a blade back part space 8 through an oiling passage 14 arranged on the front head 9. While, a blocking-up part for blocking up the lower end of the blade back part space 8 is arranged on a rear head 10 so that the oil supplied to the blade back part space 8 is gathered.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary compressor, and more particularly to a structure for refueling a blade or a swinging bush.

[0002]

2. Description of the Related Art FIGS. 10 to 12 show a conventional rotary compressor of a type in which a blade is fixed to a piston (hereinafter, referred to as a compressor).
2 shows a structural example of a “swing type compressor”.

As shown in FIGS. 10 and 11, a swing type compressor includes a casing 1, an oil reservoir 2, a motor 3
, A crankshaft 4, a cylinder 5, a roller 19,
Piston 6, bush 7, blade back space 8,
Front head 9, rear head 10, muffler 11
And a blade 12.

[0004] The crankshaft 4 is rotatably driven by a motor 3 and has an oil passage 4 a having an opening at an end for sucking oil in the oil reservoir 2.

The roller 19 is fitted around the eccentric part of the crankshaft 4 as shown in FIG. The roller 19 is integrated with the blade 12 to form the piston 6.

The cylinder 5 has a suction port for sucking the refrigerant, and forms a compression chamber 20 for compressing the refrigerant by housing the piston 6 and a suction chamber 21 for sucking the refrigerant.

[0007] The bush 7 holds the side surface of the blade 12. The cylinder 5 is provided with a bush hole for receiving the bush 7, and the bush 7 is swingably received in the bush hole. A blade back space 8 provided on the back surface of the blade 12 communicates with the oil reservoir 2.

The front head 9 and the rear head 10 are attached to the upper and lower ends of the cylinder 5, respectively. Muffler 1
1 is attached to the front head 9.

In the swing type compressor having the above structure, the rotation of the crankshaft 4 by the motor 3 causes the roller 19 to revolve in the cylinder 5 and the roller 19 to rotate.
The refrigerant is compressed in a compression chamber 20 formed by the cylinder 5. At this time, the blade 12 swings together with the bush 7 while sliding on the inner surface of the bush 7.

Next, FIGS. 13 to 15 show other structural examples of the conventional rotary compressor. In this type of rotary compressor, the blade 12 is not fixed to the roller 19.

[0013] As shown in FIG. 13, the back surface of the blade 12 is pressed against the roller 19 by the spring 16, and the blade 12 comes into contact with the outer peripheral surface of the roller 19 as shown in FIG. 15. Then, the rotation of the roller 19 causes the blade 12 to rotate.
Will slide on the outer peripheral surface of the roller 19.

Other configurations are shown in FIGS.
2 is almost the same as that of the swing type compressor shown in FIG.

[0013]

In the swing type compressor, as described above, the blade 12 slides on the inner surface of the bush 7 (the surface facing the side surface of the blade 12), and the bush 7 swings in the bush hole. Move. Therefore, the gap between the outer surface of the bush 7 (the surface facing the bush hole) and the surface of the bush hole, the inner surface of the bush 7 and the blade 12
The gap between the upper and lower end surfaces of the bush 7 and the face surfaces of the front head 9 and the rear head 10 (hereinafter, the above three gaps are collectively referred to as “oscillating bush gaps”) needs to be filled with oil. .

However, there is also an operation state in which the oil level tends to decrease, such as when the compressor is started, and when the oil level in the oil reservoir 2 decreases, oil does not exist in the above-mentioned swinging bush gap. . For this reason, the bush 7 causes chipping in the bush hole, which causes abnormal noise. At the same time, abnormal wear of the bush hole due to poor lubrication is caused.

[0015] Therefore, even when the compressor is started or under conditions where the capacity is originally required, the operating oil frequency is restricted so as to secure the specified oil level. As a result, the range of use has been limited.

The problem caused by the decrease in the oil level is the gap between the blade 12 and the cylinder 5 of the rotary compressor shown in FIGS.
Can also occur.

The present invention has been made to solve the above problems. An object of the present invention is to suppress abnormal noise generation and abnormal wear by actively supplying oil to the oscillating bush gap and blade gap even when the oil level of the oil reservoir is reduced, and to use the compressor. The condition is to expand.

[0018]

According to a first aspect of the present invention, there is provided a rotary compressor comprising: a cylinder having a roller internally fitted on an eccentric portion of a crankshaft; a blade which moves in conjunction with the revolving motion of the roller; A blade back space provided in the blade, and an oil reservoir that communicates with the blade back space and is immersed in the end of the crankshaft, and a closing portion that closes one end of the blade back space located on the oil reservoir side. And a communication path for communicating the refrigerant discharge space with the blade back space.

By closing the one end of the blade back space located on the oil reservoir side with the closing portion as described above, the communication between the blade back space and the refrigerant discharge space through the communication passage allows
For example, oil present in the refrigerant discharge space together with the compressed refrigerant can be guided into the blade back space, and the oil can be stored in the blade back space. As a result, oil can be supplied from the blade back space to the swinging bush gap and the blade gap, and even when the oil level of the oil reservoir is reduced, oil can be supplied to the swinging bush gap and the blade gap. Can be.

A rotary compressor according to a second aspect of the present invention includes a head attached to both ends of the cylinder, and one of the heads is located on the oil reservoir side and has a closing portion.

The closing portion may be provided by extending a part of one of the heads below the space behind the blade, or may be provided by attaching another member to the one of the heads. When a part of one of the heads is extended to provide the closing portion, it is not necessary to prepare another member, which is advantageous in cost.

A rotary compressor according to a third aspect includes a piston in which a roller and a blade are integrated, and a bush provided on a cylinder and provided on both sides of the blade.

When the present invention is applied to a so-called swing type compressor having a piston in which a roller and a blade are integrated as described above and a swinging bush, the oil level in the oil reservoir is reduced. Also, oil can be supplied to the swing bush gap. Thereby, generation of abnormal noise due to chipping of the bush in the bush hole, abnormal wear of the bush hole due to poor lubrication, and the like can be effectively suppressed.

According to a fourth aspect of the present invention, there is provided a rotary compressor including a muffler for forming a refrigerant discharge space between the cylinder and the other head attached to the other end of the cylinder, and the communication path is a refrigerant discharge space surrounded by the muffler. And the space behind the blade.

In the refrigerant discharge space located between the muffler and the other head, oil is discharged from the compression chamber together with the refrigerant. This oil collides with, for example, a muffler wall, flows down, and accumulates on the other head. Therefore, by providing the communication path as described above, the oil accumulated on the other head can be supplied to the blade back space through the communication path.

In the rotary compressor according to the fifth aspect, the other head closes the other end of the blade back space and has an oil pocket, and the communication passage penetrates the other head and connects the oil pocket and the blade. Open to the back space.

As described above, the oil pocket provided on the other head is for storing oil in the refrigerant discharge space and the oil on the other head, and is stored in the oil pocket by opening an oil passage in the oil pocket. Oil can be efficiently supplied to the blade back space. At this time, by closing the other end of the blade back space with the other head, both ends of the blade back space are closed, and the oil accumulated in the oil pocket provided in the other head by the respiratory effect due to the reciprocating motion of the piston is removed by the blade. It can be efficiently supplied to the back space.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

(Embodiment 1) First, Embodiment 1 of the present invention will be described with reference to FIGS. 1 and 2 show a swing type compressor according to Embodiment 1 of the present invention.

As shown in FIGS. 1 and 2, the swing type compressor of the present embodiment has a casing 1 and an oil sump 2.
A motor 3, a crankshaft 4, a cylinder 5, a roller 19, a piston 6, a bush 7, a blade back space 8, a front head 9, a rear head 10,
A muffler 11 and a blade 12 are provided.

An oil reservoir 2 is provided at one end of the casing 1. The crankshaft 4 is driven to rotate by the motor 3, and
Oil passage 4 having an opening at the end for sucking up oil in the oil passage 4
a. One end of the crankshaft 4 in the axial direction is immersed in the oil reservoir 2, and the oil in the oil reservoir 2 is sucked into the oil passage 4 a by the rotation of the crankshaft 4. Oil passage 4
The oil in a is supplied to each sliding point.

The roller 19 is fitted around the eccentric portion of the crankshaft 4 and revolves with the rotation of the crankshaft 4. The roller 19 is integrated with the blade 12 to form the piston 6.

The cylinder 5 has a suction port for sucking the refrigerant, and forms a compression chamber for compressing the refrigerant by incorporating the piston 6 therein and a suction chamber for sucking the refrigerant.

The bush 7 sandwiches both sides of the blade 12. The cylinder 5 is provided with a bush hole for receiving the bush 7, and the bush 7 is swingably received in the bush hole. The blade back space 8 provided on the back surface of the blade 12 communicates with the oil reservoir 2.

The front head 9 and the rear head 10 are attached to the upper and lower ends (both ends in the axial direction) of the cylinder 5, respectively. The front head 9 has a plurality of through holes 17 as shown in FIG.

The muffler 11 is attached to the front head 9. The compressed refrigerant is discharged from a discharge port 18 shown in FIG. 1 into a refrigerant discharge space between the muffler 11 and the front head 9, and the refrigerant flows through the muffler 11 and a boss of the front head 9 (a protrusion for receiving the crankshaft 4). Through the gap between the mufflers 11. Therefore, the discharged refrigerant also exists in the space outside the muffler 11, and this space also becomes the refrigerant discharge space 13a. In the refrigerant discharge space 13a, there are oil discharged from the oil passage 4a together with the compressed refrigerant, oil mixed in the refrigerant after compression, and the like.

The end (lower end) of the blade back space 8 provided on the back surface of the blade 12 on the oil reservoir 2 side is closed. In this case, the lower end of the blade back space 8 is closed by a closing portion 10 a formed by extending the rear head 10. Further, another member may be attached to the rear head 10 to close the lower end of the blade back space 8.

On the other hand, the upper end of the blade back space 8 is open, and a through hole (communication passage) formed in the front head 9 is provided.
17, the blade back space 8 becomes the refrigerant discharge space 13a.
Is in communication with

As described above, oil exists in the refrigerant discharge space 13a. The oil flows down, for example, along the surface of the muffler 11 and the surface of the front head 9, or falls along with the refrigerant on elements such as the motor 3. . This oil can be guided into the blade back space 8 through the through hole 17 as shown by the arrow in FIG. 2, and the oil can be stored in the blade back space 8.

The oil accumulated in the blade back space 8 in this way is supplied from the blade back space 8 to the swing bush gap. Therefore, even when the oil level of the oil reservoir 2 does not reach the height around the bush 7, oil can be supplied to the swinging bush gap, causing abnormal noise due to chipping of the bush 7 and abnormal wear of the cylinder 5. Can be suppressed. As a result, the prescribed oil level of the oil reservoir 2 can be reduced, and the operating conditions of the compressor can be expanded.

The swing type compressor uses rollers 19
The piston 6 is formed by integrating the piston 5 and the blade 12, and the inside of the cylinder 5 is partitioned into a compression chamber and a suction chamber by the piston 6.

(Embodiment 2) Next, Embodiment 2 of the present invention will be described with reference to FIGS. FIG.
4 and FIG. 4 show a rotary compressor according to the second embodiment.

In this embodiment, the first embodiment described above is used.
Is applied to a rotary compressor that is not a swing type.

As shown in FIGS. 3 and 4, also in the second embodiment, the rear head 10 is
The closing portion 10a is provided by extending to the lower side.
While closing the lower end of the blade back space 8, the blade back space 8 communicates with the refrigerant discharge space 13a.

As a result, oil can be supplied from the blade back space 8 to the blade gap, and the generation of abnormal noise and abnormal wear in the blade gap can be suppressed as in the first embodiment. Can be lowered, and the operating conditions of the compressor can be expanded.

In the rotary compressor according to the second embodiment, the roller 19 and the blade 12 are separate members, and the back surface of the blade 12 is pressed by a spring 16 so that the blade 12 is I'm pressing. Other configurations are the same as those in the first embodiment.
Duplicate description is omitted.

Third Embodiment Next, a third embodiment of the present invention will be described with reference to FIGS. 5, 6, and 9. 5 and 6 show a swing type compressor according to the third embodiment. FIG. 9 shows a front head 9 usable in the third embodiment and a fourth embodiment described later.
FIG.

As shown in FIGS. 5 and 6, in the third embodiment, the upper end of the blade back space 8 is closed by the front head 9, an oil supply passage 14 passing through the front head 9 is provided, and the front head 9 and the muffler The refrigerant discharge space 13b between the blades 11 and the blade back space 8 communicate with each other through an oil supply passage 14.

As the crankshaft 4 rotates, oil is sucked up from the oil reservoir 2 into the oil passage 4a, and this oil is supplied to the bearing of the crankshaft 4 through each oil supply hole. The oil after the bearing lubrication enters the suction chamber mainly through the upper and lower end surface gaps of the piston 6, and is discharged together with the refrigerant into the refrigerant discharge space 13b. The oil-containing refrigerant collides with the valve retainer, the wall surface of the muffler 11 and the like to become oil, and the front head 9
Collect on top.

The front head 9 has an oil pocket 15 as shown in FIGS. The oil pocket 15
As shown in FIG. 9, a concave shape is provided on the surface of the front head 9 near the discharge port 18.

Therefore, the above oil is accumulated in the oil pocket 15. Therefore, one end of the oil supply passage 14 is opened in the oil pocket 15 as shown in FIG. Thereby, the oil accumulated in the oil pocket 15 of the front head 9 can be efficiently supplied to the blade back space 8 through the oil supply passage 14.

At this time, since the upper end of the blade back space 8 is closed at the peripheral edge of the front head 9, both ends of the blade back space 8 are substantially closed, and the reciprocating motion of the piston 6 causes a respiration effect. The oil accumulated on the front head 9 can be efficiently supplied to the blade back space 8.

The configuration other than the above is substantially the same as that of the first embodiment, and a duplicate description will be omitted.

(Fourth Embodiment) Next, a fourth embodiment of the present invention will be described with reference to FIGS. FIG.
8 and FIG. 8 show a rotary compressor according to the fourth embodiment.

In this embodiment, the third embodiment described above is used.
Is applied to a rotary compressor that is not a swing type.

As shown in FIGS. 7 and 8, also in the fourth embodiment, the front head 9 closes the upper end of the blade back space 8, and an oil supply passage 14 penetrating the front head 9 is provided. The refrigerant discharge space 13b and the blade back space 8 between the oil supply passage 1 and the muffler 11
4 is used to communicate. Thereby, the same effect as in the third embodiment can be obtained.

In the rotary compressor according to the fourth embodiment, the roller 19 and the blade 12 are separate members, and the back surface of the blade 12 is pressed by the spring 16 so that the blade 12 is I'm pressing. Other configurations are the same as those of the third embodiment.
Duplicate description is omitted.

[0058]

According to the first aspect of the present invention, there is provided a rotary compressor including a closing portion for closing one end of a blade back space located on the oil reservoir side, and a communication passage for communicating the refrigerant discharge space with the blade back space. Structure. According to the above structure, the oil present in the refrigerant discharge space together with the compressed refrigerant can be guided into the blade back space, and can be stored in the blade back space. Therefore, the oil accumulated in the back space of the blade can be supplied to the swinging bush gap and the blade gap, and even when the oil level of the oil sump decreases, the oil is supplied to the swinging bush gap and the blade gap. Therefore, generation of abnormal noise due to chipping and abnormal wear of the cylinder and the like can be suppressed, and the prescribed oil level can be reduced. Thereby, the use conditions of the compressor can be expanded.

The rotary compressor according to the second aspect has heads attached to both ends of the cylinder, and one of the heads is located on the oil reservoir side and has a closed portion. It is possible to attach another member to one of the heads, or to extend a part of one of the heads to close one end of the blade back space, so that oil can be stored in the blade back space. Therefore, the oil accumulated in the back space of the blade can be supplied to the swinging bush gap and the blade gap, and even when the oil level of the oil sump decreases, the oil is supplied to the swinging bush gap and the blade gap. Therefore, generation of abnormal noise due to chipping and abnormal wear of the cylinder and the like can be suppressed, and the prescribed oil level can be reduced. Thereby, the use conditions of the compressor can be expanded.

The rotary compressor according to the third aspect has a structure in which a piston having rollers and blades integrated therewith is provided, and a bush provided on the cylinder and provided on both sides of the blade is provided. Even when the oil level in the oil reservoir is reduced, oil can be supplied to the swinging bush gap or blade gap. It is possible to effectively suppress abnormal wear and the like of the hole.

According to a fourth aspect of the present invention, there is provided a rotary compressor including a muffler which forms a refrigerant discharge space with the other head attached to the other end of the cylinder, and wherein the communication passage has a refrigerant discharge space surrounded by the muffler. And the space behind the blade. Thus, the oil discharged from the compression chamber into the refrigerant discharge space together with the compressed refrigerant flows against the muffler wall and flows down, and accumulates on the other head. Therefore, by providing a communication path in the other head, oil accumulated on the other head is supplied to the blade back space through the communication path. Therefore, the oil accumulated in the blade back space can be supplied to the swinging bush gap and the blade gap, and even when the oil level of the oil sump decreases,
Since oil can be supplied to the swing bush gap and the blade gap, generation of abnormal noise due to chipping and abnormal wear of the cylinder and the like can be suppressed, and the specified oil level can be reduced. Thereby, the use conditions of the compressor can be expanded.

In the rotary compressor according to the fifth aspect, the other head closes the other end of the back space of the blade and has an oil pocket, and the communication passage penetrates the other head, and the oil pocket and the blade It is a structure that opens to the back space. Thus, the oil accumulated in the oil pocket can be efficiently supplied to the blade back space. At this time, by closing the other end of the blade back space with the other head, both ends of the blade back space are closed, and oil accumulated on the other head due to the respiratory effect by the reciprocating motion of the piston is efficiently transferred to the blade back space. Can be supplied to
Therefore, the oil accumulated in the back space of the blade can be supplied to the swinging bush gap and the blade gap, and even when the oil level of the oil sump decreases, the oil is supplied to the swinging bush gap and the blade gap. So you can
Generation of abnormal noise due to chipping and abnormal wear of cylinders and the like can be suppressed, and the specified oil level can be reduced. Thereby, the use conditions of the compressor can be expanded.

[Brief description of the drawings]

FIG. 1 is a plan view of a swing type compressor according to Embodiment 1 of the present invention as viewed from above a front head.

FIG. 2 is a sectional view of the swing type compressor shown in FIG.

FIG. 3 is a plan view of a rotary compressor according to Embodiment 2 of the present invention as viewed from above a front head.

FIG. 4 is a sectional view of the rotary compressor shown in FIG.

FIG. 5 is a plan view of a swing type compressor according to Embodiment 3 of the present invention as viewed from above a front head.

FIG. 6 is a sectional view of the swing type compressor shown in FIG.

FIG. 7 is a plan view of a rotary compressor according to Embodiment 4 of the present invention as viewed from above a front head.

8 is a cross-sectional view of the rotary compressor shown in FIG.

FIG. 9 is a perspective view showing a structural example of a front head in the rotary compressor of the present invention.

FIG. 10 is a plan view of a conventional swing type compressor as viewed from above a front head.

11 is a sectional view of the swing type compressor shown in FIG.

FIG. 12 is a diagram showing an internal structure of a cylinder of the swing type compressor shown in FIG.

FIG. 13 is a plan view of a conventional rotary compressor as viewed from above a front head.

FIG. 14 is a sectional view of the rotary compressor shown in FIG.

FIG. 15 is a diagram showing an internal structure of a cylinder of the rotary compressor shown in FIG.

[Explanation of symbols]

Reference Signs List 1 casing, 2 oil sump, 3 motor, 4 crankshaft, 4a oil passage, 5 cylinder, 6 piston, 7
Bush, 8 bush back space, 9 front head, 10 rear head, 10a closing portion, 11 muffler, 12 blade, 13a, 13b refrigerant discharge space,
14 oil supply passage, 15 oil pocket, 16 spring, 17
Through-hole, 18 discharge port, 19 roller, 20
Suction chamber, 21 Compression chamber, 22 Valve closing the discharge port.

Claims (5)

[Claims] 1. A cylinder (5) containing a roller (19) externally fitted to an eccentric part of a crankshaft (4), and a blade (1) that moves in conjunction with the revolving motion of the roller (19).
2), a blade back space (8) provided at the back of the blade (12), and an oil sump communicating with the blade back space (8) and immersed in the end of the crankshaft (4). (2) a rotary compressor comprising:
A closing portion (10a) for closing one end of the blade back space (8) located on the oil reservoir (2) side; a refrigerant discharge space (13a, 13b); and the blade back space (8).
And a communication path (14, 17) for communicating with the rotary compressor. 2. A head (9, 10) attached to both ends of the cylinder (5), and one of the heads (1) is provided.
0) is located on the oil reservoir (2) side, and the closed portion (1)
The rotary compressor according to claim 1, comprising 0a). And a piston (6) in which said roller (19) and said blade (12) are integrated, and said piston (1) is provided on said cylinder (5).
The rotary compressor according to claim 1 or 2, comprising a bush (7) installed on both sides of (2). 4. A refrigerant discharge space (13) between the cylinder (5) and another head (9) attached to the other end of the cylinder (5).
b) forming a muffler (11), wherein the communication passage (14) communicates the refrigerant discharge space (13b) surrounded by the muffler (11) with the blade back space (8). The rotary compressor according to any one of claims 1 to 3. 5. The other head (9) closes the other end of the blade back space (8) and has an oil pocket (15), and the communication path (14) is connected to the other head (9). The rotary compressor according to claim 4, wherein the rotary compressor penetrates through (9) and opens into the oil pocket (15) and the blade back space (8).