JPH09112463A - Swing compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make lubricating oil out of a feed passage positively feedable to a rocking bush without entailing any damage to the sealability. SOLUTION: A piston 9 is constituted so as to be evolved in a cylinder chamber 6a with a rocking bush as the fulcrum via a blade 31 with the rotation of a driving shaft 5. A lubricating oil passage 41 interconnecting an interval between an oil feeding passage 10 and a clearance is installed in space between a midway position of this oil feeding passage 10 and a clearance between an outer circumferential surface of the rocking bush and an inner circumferential surface of a bush hole to be opposed to each other only in time of revolution of the piston 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a swing compressor used in a refrigeration system or the like, and more particularly to a lubricating structure for a swing bush that swings in a bush hole of a cylinder.

[0002]

2. Description of the Related Art Conventionally, a swing compressor is provided with a compression element driven by a motor in a closed casing, as disclosed in, for example, Japanese Patent Laid-Open No. 7-27074. A cylinder having a cylinder chamber in which an intake port and a discharge port are opened, upper and lower bearings arranged to close the cylinder chamber on both upper and lower sides of the cylinder and rotatably supporting a drive shaft, and the cylinder chamber An annular piston whose inner peripheral portion is rotatably fitted to the eccentric shaft portion of the drive shaft, and a low pressure chamber which is connected to the outer peripheral portion of the piston in a protruding manner and communicates the cylinder chamber with the suction port. And a blade that divides the high-pressure chamber leading to the discharge port,
A bush hole provided between the suction port and the discharge port of the cylinder and having an opening opening to the cylinder chamber, and swingably provided in the bush hole, swinging the protruding tip side of the blade. A swinging bush that freely and forwardly and backwardly supports is provided, and as the drive shaft rotates, the piston revolves in the cylinder chamber with the swinging bush as a fulcrum via the blade, and the suction port is provided for each revolution of the piston. A fluid such as a refrigerant gas sucked from is compressed and discharged from a discharge port.

Further, in the above-mentioned swing compressor, a pump is provided at the lower end of the drive shaft extending to the lower end of the hermetic casing, and the lubricating oil stored at the lower end of the hermetic casing is axially moved in the drive shaft by the pump. The oil is supplied into the cylinder chamber through an oil supply passage extending to the.

[0004]

However, in the above swing compressor, although the lubricating oil is supplied into the cylinder chamber from the inside of the piston (drive shaft side) through an opening in the middle of the oil supply passage, It is difficult to supply the lubricating oil to the rocking bush on the cylinder chamber inner wall side away from the oil supply passage, and because the rocking bush is provided between the high pressure chamber and the low pressure chamber, the oil supply passage is lubricated. If the opening between the outer peripheral surface of the oscillating bush and the inner peripheral surface of the bush hole is bypassed via an oil passage or the like, the sealability of the outer peripheral surface of the oscillating bush to the bush hole will deteriorate. In particular, since the fluid pressure from the high pressure chamber acts on the oscillating bush on the low pressure chamber side of the blade via the blade, the outer peripheral surface of the oscillating bush on the low pressure chamber side and the inner periphery of the bush hole are While preventing problems such as seizure in the gap between the surface,
In order to smoothly oscillate the oscillating bush on the low pressure chamber side, there has been a demand for positively supplying lubricating oil to the oscillating bush.

The present invention has been made in view of the above points, and an object of the present invention is to provide a swing compressor capable of positively supplying the lubricating oil from the oil supply passage to the oscillating bush without impairing its sealing property. To provide.

[0006]

[Means for Solving the Problems] In order to achieve the above-mentioned object, a solution means of the invention according to claim 1 is a suction port (2
1) and a cylinder (6) having a cylinder chamber (6a) in which the discharge port (22) is opened, and the cylinder (6a) is arranged on both upper and lower sides of the cylinder (6) so as to close the cylinder chamber (6a). Upper bearing (7) and lower bearing (8) that rotatably support), and the inner peripheral part that rotates in the eccentric shaft part (5a) of the drive shaft (5). Annular pistons (9) with possible fitting
And a low pressure chamber (34) which is connected to the outer peripheral portion of the piston (9) in a protruding manner and which communicates the cylinder chamber (6a) with the suction port (21) and a high pressure chamber (35) which communicates with the discharge port (22). Blades to partition into (31)
And an opening (24) provided between the suction port (21) and the discharge port (22) of the cylinder (6) and opening to the cylinder chamber (6a).
a) a bush hole (24) having a) and a swinging bush (24) swingably provided in the bush hole (24) for supporting the protruding tip side of the blade (31) swingably and forward and backward. 32)
And a pump (11) which is provided at the lower end of the drive shaft (5) and supplies lubricating oil into the cylinder chamber (6a) through an oil supply passage (10) extending axially in the drive shaft (5). Assuming a swing compressor (1) equipped with and. And, a gap between the oil supply passage (10) and the outer peripheral surface of the swing bush (32) and the inner peripheral surface of the bush hole (24) facing each other only when the piston (9) revolves.
Lubricating oil passages (41) and (51) communicating between the oil supply passage (10) and the gap (36) are provided between the lubricating oil passages (41) and (36).

With this structure, in the invention according to claim 1, the gap (36) between the outer peripheral surface of the rocking bush (32) and the inner peripheral surface of the bush hole (24) is separated from the oil supply passage (10). Lubricating oil is positively supplied through the lubricating oil passages (41) and (51) to create a gap between the outer peripheral surface of the rocking bush (32) and the inner peripheral surface of the bush hole (24).
The rocking bush (32) can be smoothly rocked in the bush hole (24) without causing problems such as seizure in the (36). Moreover, the outer peripheral surface of the swing bush (32) and the bush hole which face each other only when the piston (9) revolves.
By supplying the lubricating oil to the gap (36) between the inner peripheral surface of (24), the seal between the outer peripheral surface of the rocking bush (32) and the inner peripheral surface of the bush hole (24) is damaged. There is no such thing.

[0008] The solution taken by the invention of claim 2 is as follows.
The lubricating oil passage (41) of the invention according to claim 1 is specified, and the cylinder
The side housing (8) and the cylinder (5) on the lower side of (6) in the axial direction are provided so as to straddle the side housing (8) and the cylinder (5).

With this structure, in the invention according to claim 2, the pump element (11) (at the lower end of the drive shaft (5) for further pressurizing the high-pressure lubricating oil exposed to the high-pressure atmosphere in the closed casing (2). The lubricating oil supplied into the gap (36) due to the differential pressure between the upstream end of the oil supply passage (10) and the downstream end (other end) of the lubricating oil passage (41) is closest to the pump (11). It can be efficiently guided from the lower side housing (8) through the cylinder (5) without overlying the lift of the pump (11).

[0010] The solution taken by the invention of claim 3 is as follows.
The lubricating oil passage (41) of the invention according to claim 1 or 2 is specified, and the lubricating oil passage (41) is opened to the inner peripheral surface of the bush hole (24) corresponding to the swing bush (32) through the gap (36). It is configured to be installed in.

With this structure, in the third aspect of the invention, the inside of the gap (36) is maintained without impairing the sealing property between the outer peripheral surface of the rocking bush (32) and the inner peripheral surface of the bush hole (24). The lubricating oil can be smoothly supplied in a short distance without overloading the pump (11).

The solution taken by the invention according to claim 4 is as follows:
From the blade (31) corresponding to the swing bush (32) through the gap (36), the lubricating oil passage (41) of the invention according to any one of claims 1 to 3 is specified. Also, it is configured such that it is provided so as to open only on the inner peripheral surface of the bush hole (24) on the low pressure chamber (34) side.

With this configuration, in the invention according to claim 4, the outer peripheral surface of the rocking bush on the side of the low pressure chamber (34) and the bush hole.
Lubricating oil is positively supplied to the gap (36) between the inner peripheral surface of (24), and in the gap (36) by fluid pressure acting from the high pressure chamber (35) through the blade (31). This prevents problems such as seizure of the rocking and smooth rocking of the rocking bush (32).

[0014] The solution means taken by the invention according to claim 5 is as follows.
Bush hole (24) corresponding to the rocking bush (32) through the gap (36) by specifying the lubricating oil passage (41) of the invention according to any one of claims 1 to 4. It is configured such that a single or a plurality of openings are provided on the inner peripheral surface of the above so as to straddle the swing bush (32) in the swing direction.

With this configuration, in the invention according to claim 5, the lubricating oil can be supplied into the clearance (36) all over the swinging direction of the swinging bush (32), and the swinging in the bush hole (24) can be prevented. The dynamic bush (32) can be swung more smoothly.

The means for solving the problems according to the invention of claim 6 is as follows.
In addition to the constituent features of the invention described in any one of claims 1 to 5, the gap (36) communicates with a portion of the cylinder (6) corresponding to the protruding tip side of the blade (31). And a swing bush (32) for supporting the outer peripheral surface of the blade (31) and the blade (31) which face each other only when the piston (9) revolves. The other gap (36) between it and the supporting surface is also communicated.

With this configuration, in the invention according to claim 6, the lubricating oil supplied to the clearance (36) is also supplied to the other clearance (37) through the communication space (38), and the swing bush (32). ) Is improved in lubricity.

The means for solving the problems according to the invention of claim 7 is as follows.
The lubricating oil passage (41) of the invention according to claim 6 is specified, and the communication space
The structure is provided so as to open at (38).

With this configuration, in the invention according to claim 7, the lubricating oil is evenly supplied from the communication space (38) to the gap (36) and the other gaps (37).

The means for solving the problems according to the invention of claim 8 is as follows.
The lubricating oil passage (51) of the invention according to claim 1 is specified, and the oil supply passage (1
0) and another clearance (36) between the outer peripheral surface of the blade (31) facing each other only when the piston (9) revolves and the supporting surface of the swinging bush (32) supporting the blade (31). It is provided in the blade (31) so as to communicate therewith. And other gaps
The lubricating oil supplied to the other gaps (37) is
The blade (31) is configured to communicate with the gap (36) from the protruding tip side thereof so as to be supplied also to (6).

With this structure, in the invention as set forth in claim 8, the lubricating oil flows through the lubricating oil passage (51) in the blade (31) extending from the pump (11) in a direction orthogonal to the oil supply passage (10). Through this, the gas can be efficiently guided to the other gap (37) without imposing the lift of the pump (11). Then, the lubricating oil supplied to the other gap (37) is passed through the gap (36) from the protruding tip side of the blade (31).
Also, the lubricity of the rocking bush (32) is dramatically improved, and the rocking of the rocking bush (32) becomes smoother. Moreover, by supplying the lubricating oil to the other gap (37) between the outer peripheral surface of the blade (31) and the supporting surface of the swing bush (32) which face each other only when the piston (9) revolves,
The seal between the outer peripheral surface of the blade (31) and the supporting surface of the swing bush (32) is not damaged.

The solution taken by the invention according to claim 9 is as follows.
The lubricating oil passage (51) of the invention according to claim 1, claim 6 or claim 8 is specified, and the swing bush (3) is provided through another gap (37).
The blade (31) corresponding to (2) is provided so as to open on the outer peripheral surface.

With this configuration, in the invention according to claim 9, the inside of the other gap (37) is maintained without impairing the sealing property between the outer peripheral surface of the blade (31) and the supporting surface of the swing bush (32). The lubricating oil can be smoothly supplied in a short distance without overloading the pump (11).

The solution of the invention of claim 10 is to specify the lubricating oil passage (51) of the invention of claim 1, claim 6, claim 8 or claim 9 and to provide another clearance (37). ) Via the low pressure chamber (34) of the blade (31) corresponding to the swing bush (32)
The outer peripheral surface on the side is provided so as to be opened.

According to this invention, the lubricating oil is effectively supplied between the outer peripheral surface of the blade (32) on the low pressure chamber (34) side and the supporting surface of the swing bush. While the fluid pressure acting from the high-pressure chamber (35) through the blade (31) prevents problems such as seizure in the other gap (37), the forward and backward movement of the blade (32) can be performed smoothly without any trouble, The lubricating oil supplied to the other gap (37)
Swing bush (32) from the protruding tip side of (31) to the high pressure chamber (35) side
The swing bush (32) swings while being supplied to the gap (36) between the outer peripheral surface of the bush and the inner peripheral surface of the bush hole (24) to prevent problems such as seizure in the gap (36). Can be done smoothly without any trouble.

The solution means taken by the invention of claim 11 specifies the lubricating oil passage (51) according to any one of claims 1, 6, and 8 to 10. The outer peripheral surface of the blade (31) corresponding to the swing bush (32) is provided so as to extend through the other gap (37) in the advancing / retreating direction so as to form a single opening or a plurality of openings.

With this configuration, in the invention according to claim 11, the lubricating oil can be supplied into the other gap (37) in the entire area in the advancing and retracting direction of the blade (31), and the supporting surface of the swing bush (32). The blade (31) can be moved back and forth smoothly with respect to the blade.

According to a twelfth aspect of the present invention, in addition to the constituent features of the invention described in any one of the first to eleventh aspects, a solution corresponding to the gap (36) is oscillated. On the outer peripheral surface of the bush (32), oil storage grooves (71) to (73) for storing the lubricating oil supplied to the gap (36) are provided in a recessed manner.

With this structure, in the invention as set forth in claim 12, the lubricating oil supplied into the gap (36) contains the oil sump grooves (71) to (7).
The shortage of lubricating oil in the gap is avoided by being stored in 3), and an oil seal can be smoothly performed between the inner peripheral surface of the bush hole (24) and the outer peripheral surface of the rocking bush (32).

According to a thirteenth aspect of the present invention, a means for solving the problems is that the oil sump grooves (71) to (73) of the twelfth aspect of the invention correspond to the clearance (36) and the outer circumference of the rocking bush (32). A single surface or a plurality of surfaces are provided so as to be continuous in the rocking direction.

With this structure, in the invention according to claim 13, the oil seal between the inner peripheral surface of the bush hole (24) and the outer peripheral surface of the rocking bush (32) can be sufficiently performed without unevenness.

The solution means taken by the invention according to claim 14 corresponds to the other clearance (37) in addition to the constituent features of the invention according to any one of claims 1 to 13. Other oil sump grooves (74) to (78) for accumulating the lubricating oil supplied to the other gaps (37) are provided in the supporting surface of the swing bush (32).

With this configuration, in the invention as set forth in claim 14, the lubricating oil supplied into the other gap (37) is stored in the oil sump groove (74).
~ (78) is stored to avoid lack of lubricating oil in the other gaps (37), and the oil seal between the outer peripheral surface of the blade (31) and the supporting surface of the rocking bush (32) is smooth. You can do it.

Furthermore, the solution means taken by the invention of claim 15 is the other oil sump groove (74) of the invention of claim 14.
(78) is configured to provide a single or a plurality so as to be continuous in the advancing and retreating direction of the blade (31) on the supporting surface of the swing bush (32) corresponding to the blade (31) through the other gap (37). It is a thing.

With this configuration, in the invention of claim 15, the oil seal between the outer peripheral surface of the blade (31) and the supporting surface of the swing bush (32) can be sufficiently performed without unevenness.

[0036]

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

FIG. 3 shows the entire structure of the swing compressor according to the first embodiment of the present invention.
In (1), the motor (3) is installed in the upper inner part of the closed casing (2), and the compression element (4) is installed in the lower side of the motor (3). ) Drive shaft (5)
The compression element (4) is driven to rotate. The compression element (4) is arranged in contact with a cylinder (6) having a cylinder chamber (6a) inside and upper and lower open portions of the cylinder (6), and an upper portion for closing the upper and lower open portions. A front head (7) as a bearing, a rear head (8) as a lower bearing, and a piston (9) rotatably arranged in the cylinder chamber (6a) are provided, and each of the heads (7), ( 8)
The lower portion of the drive shaft (5) is supported by a bearing portion provided in the bearing.

As shown in FIG. 2, the cylinder chamber
The inner peripheral wall of (6a) is formed to have a substantially circular cross section, the piston (9) is formed in an annular shape, and the eccentric shaft portion (5a) is rotatably fitted to the inner peripheral side thereof. ing. Above eccentric shaft
The shaft center of (5a) is offset from the center point of the drive shaft (5) by a predetermined amount, and when the drive shaft (5) rotates, the piston (9) does not rotate but at one place on the outer peripheral surface of the cylinder chamber. (6a)
It revolves along the outer peripheral wall while coming into contact with or close to the outer peripheral wall. Further, on the center side of the drive shaft (5), an oil supply passage (10) opening to the bottom oil sump (2a) of the casing (2) is provided. This oil supply channel (10)
A pump (11) is provided on the inlet side, and an intermediate outlet is opened in the sliding contact surface between the eccentric shaft portion (5a) and the piston (9), that is, in the cylinder chamber (6a). (11)
The lubricating oil pumped from the bottom oil sump (2a) is supplied into the cylinder chamber (6a) from the intermediate outlet via the oil supply passage (10).

Further, the cylinder (6) is provided with a suction port (21) and a discharge port (22) which are opened on the outer peripheral wall of the cylinder chamber (6a), and the suction port (21) has a closed casing ( 2)
While the suction pipe (2b) is connected from the outside of the
Cylinder chamber (6a) in 2) (High pressure chamber (35) which will be described later in detail)
A discharge valve (23) is provided that opens when the internal pressure exceeds a predetermined value. Further, a cylinder-shaped bush hole (24) penetrating in the axial direction is formed in the cylinder (6) at a position between the suction port (21) and the discharge port (22), and the bush hole (24) is Opening (24a) that opens toward the cylinder chamber (6a) in part of the circumference
Having.

The piston (9) is integrally provided with a blade (31) extending radially from the outer peripheral surface of the piston (9). The blade (31) is integrally formed with the piston (9), or is made of a separate member and is formed by connecting the two with a concavo-convex fitting structure or an adhesive or the like. The protruding tip side of the blade (31) is inserted into the bush hole (24), while the bush hole (24) has a pair of split bushes (32), (32) having a substantially semicircular cross section. ) Is arranged, and between the flat opposing surfaces of the split bushes (32), (32), there is formed a receiving groove (33) for receiving the protruding tip side of the blade (31) so as to be able to move forward and backward. There is. As shown in FIG. 1, the outer peripheral surfaces of the split bushes (32), (32) and the inner peripheral surface of the bush hole (24) are in sliding contact with each other through a first gap (36) (gap). In addition, the outer peripheral surface on the protruding tip side of the blade (31) and the inner peripheral surface of the receiving groove portion (33) (the blade (31)
The support surface of the swing bush (30) that supports the second gap (3
7) They are in sliding contact with each other through (other clearances), and these split bushes (32), (32) are such that the blade (31) is sandwiched in the receiving groove (33) of the blade (31). It is provided so as to allow the projecting tip side of 31) to move forward and backward and to swing integrally with the blade (31) in the bush hole (24). Cylinder corresponding to the protruding tip side of the blade (31)
A communication space (38) for communicating the first gap (36) and the second gap (37) with each other is provided at the portion (6), that is, on the side opposite to the opening (24a) of the bush hole (24). The communication space (38) is configured to allow the protruding tip of the blade (31) to advance into the cylinder (36). Also, the blade (31)
Is a high pressure chamber that communicates the cylinder chamber (6a) between the inner peripheral surface of the cylinder (6) and the outer peripheral surface of the piston (9) to the suction port (21) and to the low pressure chamber (34) and the discharge port (22). (35) and in this state, the piston (9) revolves along the inner peripheral wall of the cylinder chamber (6a) so that the piston (9) swings via the blade (31) about the split bush (32) as a fulcrum. The fluid such as the refrigerant gas sucked from the suction port (21) is compressed and discharged from the discharge port (22) every revolution. Incidentally, (2b) in FIG. 1 is an external discharge pipe connected to the upper part of the closed casing (2).

As a characteristic part of the present invention, the rocking on the low pressure chamber (34) side of the midway position of the oil supply passage (10) and the blade (31) facing each other only when the piston (9) revolves. Between the outer peripheral surface of the bush (32) and the inner peripheral surface of the hole (24) corresponding to the outer peripheral surface, between the first gap (36) on the low pressure chamber (34) side, the oil supply passage (10 ) And the first gap (36) are provided with a lubricating oil passage (41). The lubricating oil passage (41) is an oil supply passage.
A first oil passage (42) connected to an intermediate position of (10) and extending in the rear head (8) toward the low pressure chamber (34) in the radial direction orthogonal to the axial direction of the cylinder (6); The upstream end is connected to the tip of the passage (42) and the low pressure chamber of the cylinder chamber (6a)
A second oil passage (43) extending upward substantially parallel to the drive shaft (5) along the peripheral wall on the (34) side is provided and is provided across the rear head (8) and the cylinder (6). ing. Lubricating oil passage
The downstream end of (41), that is, the downstream end of the second oil passage (43) is the first
On the inner peripheral surface of the bush hole (24) corresponding to the swing bush (32) on the low pressure chamber (34) side through the gap (36) (the swing range (m of the swing bush (32) shown in FIG. 2 (m )), The swing bush (32) is opened at a substantially central position in the swing direction.

Therefore, in the above embodiment, the intermediate position of the oil supply passage (10) corresponding to the rear head (8) and the piston
The first gap on the low pressure chamber (34) side between the outer peripheral surface of the swing bush (32) on the low pressure chamber (34) side and the inner peripheral surface of the bush hole (24) facing each other only when revolving in (9). Since the lubricating oil passageway (41) communicates with the (36), the oil feeding passageway (41) is formed between the outer peripheral surface of the rocking bush (32) on the low pressure chamber (34) side and the inner peripheral surface of the bush hole (24). Lubricating oil from 10) is positively supplied through the lubricating oil passage (41), and seizure occurs in the first gap (36) by the fluid pressure acting from the high pressure chamber (35) through the blade (31). It is possible to prevent such problems as described above and to smoothly rock the rocking bush (32) without causing any trouble due to fluid pressure.

Further, since the lubricating oil passage (41) is provided so as to straddle the side housing (8) and the cylinder (5) on the axially lower side of the cylinder (6), the inside of the closed casing (2). Between the pump (11) at the lower end of the drive shaft (5) (upstream end of the oil supply passage (10)) and the downstream end of the lubricating oil passage (41), which further pressurizes the high pressure lubricating oil exposed to the high pressure atmosphere in The lubricating oil supplied into the first gap (36) due to the differential pressure is efficiently delivered from the rear head (8) closest to the pump (11) through the cylinder (5) to the lift of the pump (11). I can guide you.

Furthermore, the downstream end of the lubricating oil passage (41) is located in the swing bush (32) on the side of the low pressure chamber (34) facing each other through the first gap (36) only when the piston (9) revolves. Since the outer peripheral surface and the inner peripheral surface of the bush hole (24) of the inner peripheral surface of the bush hole (24) are opened at a substantially central position in the rocking direction of the rocking bush (32), the first gap ( By supplying the lubricating oil to the (36), the sealing performance between the outer peripheral surface of the rocking bush (32) and the inner peripheral surface of the hole (24) can be smoothly ensured, and the first gap (3
6) It is possible to smoothly supply the lubricating oil to the inside in a short distance without overlying the lift of the pump (11).

The present invention is not limited to the above-described first embodiment, but includes various other modifications. For example, in the first embodiment, the downstream end of the lubricating oil passage (41) is opened to the inner peripheral surface of the bush hole (24) on the side of the low pressure chamber (34), but as shown in FIG. At the downstream end of the oil passage (41), the high and low pressure chambers (34), (35) of the bush hole (24), respectively.
May be opened to the inner peripheral surface on the side, in which case the first gap (36) between the outer peripheral surface of the rocking bush (32) and the inner peripheral surface of the bush hole (24) is lubricated. Oil is positively supplied, and the swing bush (32) can smoothly swing in the bush hole (24).

Further, in the first embodiment, the downstream end of the lubricating oil passage (41) is opened in the inner peripheral surface of the bush hole (24) substantially in the center of the swinging bush (32) in the swinging direction. However, the downstream end of the lubricating oil passage is formed by a slit-shaped opening extending in the axial direction of the cylinder at a substantially central position in the swinging direction of the swinging bush on the inner peripheral surface of the bushing hole corresponding to the swinging bush via the first gap. It may be configured. On the other hand, as shown in FIG. 5, it extends in the circumferential direction on the inner peripheral surface of the bush hole (24) corresponding to the swing bush (32) on the low pressure chamber (34) side through the first gap (36). The downstream end of the lubricating oil passage (41) may be configured by a slit-shaped opening that extends over the entire swing range (k) of the swing bush (32). Further, as shown in FIG. 6, the downstream end of the lubricating oil passage (41) may be opened to the communication space (38). In this case, the first gap (36) and the second gap (37). ) Will be supplied with lubricating oil evenly.

Next, a second embodiment of the present invention will be described with reference to FIGS.

In the second embodiment, the structure of the lubricating oil passage is changed.

That is, in the present embodiment, as shown in FIGS. 7 and 8, the lubricating oil passage (51) includes the oil supply passage (10) and the piston.
The blade (31) so as to communicate with the second gap (37) between the outer peripheral surface of the blade (31) and the inner peripheral surface of the bush hole (24) which face each other only when revolving in (9). It is provided inside. The lubricating oil passage (51) is formed so as to extend to the radial direction blade (31) side from a substantially central position in the axial direction of the piston (9), and the downstream end of the lubricating oil passage (51) has the second gap ( 37) via the outer peripheral surface of the blade (31) corresponding to the supporting surface of the swing bush (32) on the low pressure chamber (34) side (the blade shown in FIG. 8).
The blade (31) has an opening in the forward / backward direction substantially in the center in the forward / backward movement range (k) of (31). The rest of the configuration except the lubricating oil passage is the same as in the case of the first embodiment described above, and the same parts are assigned the same reference numerals and detailed explanations thereof are omitted.

Therefore, in this embodiment, the lubricating oil passes through the lubricating oil passage (51) in the blade (31) extending in the radial direction orthogonal to the axial direction of the cylinder (6) with respect to the oil supply passage (10). The low pressure chamber (34) is efficiently guided to the second gap (37) on the low pressure chamber (34) side,
The lubricating oil is effectively supplied between the outer peripheral surface of the blade (31) on the side and the supporting surface of the swing bush (32), and the fluid pressure acting from the high pressure chamber (35) through the blade (31) By the second gap
Prevents burn-in and other problems with (37), and uses the blade (31)
The forward / backward movement of can be smoothly performed without causing any trouble due to fluid pressure. On the other hand, the lubricating oil supplied to the second gap (37) on the low pressure chamber (34) side is connected to the communicating space (3) on the protruding tip side of the blade (31).
It is also supplied to the first gap (36) on the low pressure chamber (34) side via 8),
The rocking bush (32) rocks while securing the first gap (36).
It can be done smoothly without any trouble due to fluid pressure. Therefore, the lubricity of the rocking bush (32) is dramatically improved,
The swing bush (32) can swing more smoothly.

Also, the swinging bush is inserted through the second gap (37).
Since the downstream end of the lubricating oil passage (51) is open to the outer peripheral surface of the blade (31) corresponding to (32), the outer peripheral surface of the blade (31) and the supporting surface of the swing bush (32) are The lubricating oil is supplied to the second gap (37) by pumping (1
It can be done smoothly over a short distance without overdoing the lifting height of 1). Moreover, by supplying the lubricating oil to the second gap (37) between the outer peripheral surface of the blade (31) and the supporting surface of the swing bush (32) which face each other only when the piston (9) revolves,
The seal between the outer peripheral surface of the blade (31) and the supporting surface of the swing bush (32) is not impaired, and the sealing performance in the second gap (37) can be secured.

The present invention is not limited to the above-mentioned respective embodiments, but includes various modifications. For example, in the second embodiment, the lubricating oil passage
Although the downstream end of (61) was opened to the support surface of the blade (31) on the low pressure chamber (34) side, as shown in FIG. 9, the downstream ends of the lubricating oil passages (51) and (51) were 31) High and low pressure chambers (34), (35)
It may be opened on the side supporting surface. In this case, such as seizure in the second gap (37) between the outer peripheral surface of the blade (31) and the supporting surface of the swing bush (32), It is possible to smoothly move the blade (31) back and forth within the receiving groove (33) while preventing problems.

Further, in the second embodiment, the downstream end of the lubricating oil passage (51) is opened substantially at the center of the advancing / retreating range (k) in the advancing / retreating direction on the outer peripheral surface of the blade (31). Figure 10
As shown in FIG. 5, the blade (31) is supported on the supporting surface of the swing bush (32) corresponding to the blade (31) through the second gap (37).
A single long hole opening (61) extending diagonally so as to be continuous within the forward / backward movement range (k) of (31), or a plurality of (four in the figure) arranged diagonally as shown in FIG. A perfect circular opening (62), ... Or a plurality (two in the figure) of long hole openings (6 in the figure) arranged in parallel in a diagonal direction as shown in FIG.
The downstream end of the lubricating oil passage (51) may be constituted by 3) and (63).

Further, the rocking bush (32) described in each of the above-mentioned embodiments is provided with the outer peripheral surface and the supporting surface as shown in FIGS.
As shown in 0, oil sump grooves (71) to (78) may be provided. That is, on the outer peripheral surface of the swing bush (32), the swing range of the swing bush (32) as shown in FIG.
(m) A single elongated hole-shaped oil sump groove extending in the diagonal direction so as to be continuous in (m), or a plurality of (three in the figure) elongated holes arranged in parallel in the diagonal direction as shown in FIG. Oil sump groove
(72), ... Or a plurality of (4 in the figure) perfectly circular oil sump grooves (73) arranged in a diagonal direction as shown in FIG.
, Or a singular number extending diagonally on the supporting surface of the rocking bush (32) so as to be continuous within the rocking range (m) of the rocking bush (32) as shown in FIG. Or a long hole-shaped oil sump groove (74), or a plurality of (three in the figure) long hole-shaped oil sump grooves (75), arranged in parallel in a diagonal direction as shown in FIG. A plurality of (4 in the figure) perfect circular oil sump grooves (7
6), ..., or a single oil sump groove (77) having a substantially semi-circular cross section extending axially in the center of the supporting surface of the swing bush (32) as shown in FIG. 19, or FIG. A plurality of (3 in the figure) oil sump grooves having a substantially semi-circular cross section extending in the axial direction parallel to the supporting surface of the swinging bush (32) as shown in FIG.
(78), ... May be provided. In this case, the oil sump grooves (71) to (78) are provided on either one or both of the outer peripheral surface and the supporting surface of the swing bush (32).

[0055]

As described above, according to the swing compressor of the first aspect of the present invention, the oil supply passage, the outer peripheral surface of the rocking bush and the inner peripheral surface of the bush hole which face each other only when the piston revolves. Since a lubricating oil passage communicating with the gap is provided, the lubricating oil can be positively supplied from the oil supply passage through the lubricating oil passage, and problems such as seizure in the gap can be reliably prevented and the bush The swinging bush can be smoothly swung in the hole, and the sealing between the outer circumferential surface of the swinging bush and the inner circumferential surface of the bush hole can be smoothly performed.

According to the swing compressor of the second aspect of the present invention, since the lubricating oil passage is provided over the side housing on the axial lower side of the cylinder and the cylinder, the lower side housing closest to the pump is provided. It is possible to efficiently supply the lubricating oil into the clearance through the cylinder through the cylinder without overloading the pump head.

According to the swing compressor of the third aspect of the invention, since the lubricating oil passage is opened on the inner peripheral surface of the bush hole corresponding to the gap, the inside of the gap is ensured while the sealability in the gap is secured. It is possible to smoothly supply the lubricating oil to the pump in a short distance without overwhelming the pump head.

According to the swing compressor of the fourth aspect of the present invention, the lubricating oil passage is opened only on the inner peripheral surface of the bush hole on the low pressure chamber side. Lubricating oil can be effectively supplied to the inner peripheral surface of the hole, and the rocking bush can be smoothly rocked without causing any trouble due to fluid pressure.

According to the swing compressor of the fifth aspect of the invention, the lubricating oil passage is opened in the inner peripheral surface of the bush hole corresponding to the gap so as to extend in the swinging direction of the swinging bush. The lubricating oil can be supplied to the entire area of the swinging bush in the swinging direction, and the swinging of the swinging bush can be performed more smoothly.

According to the swing compressor of the sixth aspect of the present invention, the cylinder on the tip end side of the blade is provided with the communication space that communicates with the clearance and the other clearances respectively. Therefore, the lubricating oil supplied to the clearance is communicated with the communication space. Can be supplied to other gaps to improve the lubricity of the rocking bush.

According to the swing compressor of the seventh aspect of the invention, since the lubricating oil passage is opened in the communication space, the lubricating oil can be evenly supplied from the communication space to the gaps and other gaps.

According to the swing compressor of the eighth aspect of the invention, the lubricating oil passage is provided in the blade, and another gap for supplying the lubricating oil through the lubricating oil passage is provided from the protruding tip side of the blade to the gap. Since they are communicated with each other, the lubricating oil can be efficiently supplied to the other gaps via the lubricating oil passage without overwhelming the pump head while ensuring the sealing performance in the gap, and the gap from the protruding tip side of the blade Also, by supplying the lubricating oil, the lubricity of the swing bush can be dramatically improved, and the swing bush can swing more smoothly.

According to the swing compressor of the ninth aspect of the invention, since the lubricating oil passage is opened in the outer peripheral surface of the blade corresponding to the other clearance, the pump is pumped in a state where the sealability of the other clearance is secured. It is possible to smoothly supply the lubricating oil into the other gaps in a short distance without overlying the lifting height of.

According to the swing compressor of the tenth aspect of the invention, since the lubricating oil passage is opened only on the outer peripheral surface of the blade corresponding to the other clearance on the low pressure chamber side, the lubricating oil to the other clearance can be prevented. The effective supply allows the blade to move forward and backward smoothly without causing any trouble due to fluid pressure, and also effectively supplies the lubricating oil to other gaps without causing any trouble due to fluid pressure. The rocking bush can be rocked smoothly.

According to the swing compressor of the eleventh aspect of the invention, since the lubricating oil passage is opened so as to extend in the advancing / retreating direction on the outer peripheral surface of the blade which is specified and corresponds to the other clearance, The lubricating oil can be supplied to the entire area in the advancing / retreating direction, and the advancing / retreating movement of the blade can be performed more smoothly.

According to the swing compressor of the twelfth aspect of the present invention, since the oil sump groove is provided on the outer peripheral surface of the swing bush corresponding to the gap, the lubricating oil stored in the oil sump groove allows the oil to be stored in the gap. It is possible to reliably perform the oil seal while avoiding the lack of lubricating oil.

According to the swing compressor of the thirteenth aspect of the invention, since the oil sump groove is provided so as to be continuous in the swinging direction of the swinging bush, the inner peripheral surface of the bush hole and the outer peripheral surface of the swinging bush are formed. The oil seal between them can be sufficiently performed without unevenness.

According to the swing compressor in the fourteenth aspect of the present invention, since another oil sump groove is provided on the supporting surface of the swing bush corresponding to the other gap, the lubricating oil stored in the other gap is used. Therefore, the lack of lubricating oil in other gaps can be avoided and the oil seal can be smoothly performed.

Further, according to the swing compressor in the fifteenth aspect of the invention, since the other oil sump groove is provided so as to be continuous in the swing direction of the swing bush, the outer peripheral surface of the blade and the support of the swing bush are supported. The oil can be sufficiently sealed between the surface and the surface.

[Brief description of the drawings]

FIG. 1 is a vertical sectional side view of a swing compressor according to a first embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional plan view of the vicinity of the swing bush.

FIG. 3 is a cross-sectional plan view of the compression element, which is also cut in the vicinity of the eccentric shaft portion.

FIG. 4 is a view corresponding to FIG. 2 according to a first modified example of the first embodiment.

FIG. 5 is a view corresponding to FIG. 2 according to a second modified example of the first embodiment.

FIG. 6 is a view corresponding to FIG. 2 according to a third modified example of the first embodiment.

FIG. 7 is a view corresponding to FIG. 1 according to a second embodiment of the present invention.

FIG. 8 is a view equivalent to FIG.

FIG. 9 is a view corresponding to FIG. 2 according to a first modification example of the second embodiment.

FIG. 10 is a perspective view around a blade according to a second modification of the second embodiment.

FIG. 11 is a view showing a third modification of the second embodiment shown in FIG.
FIG.

FIG. 12 is a diagram showing a fourth modification of the second embodiment.
FIG.

FIG. 13 is a perspective view of a swing bush according to a first modification of each embodiment.

FIG. 14 is a view corresponding to FIG. 13 according to a second modified example of each embodiment.

FIG. 15 is a view corresponding to FIG. 13 according to a third modified example of each embodiment.

FIG. 16 is a view corresponding to FIG. 13 according to a fourth modified example of each embodiment.

FIG. 17 is a view corresponding to FIG. 13 according to a fifth modified example of each embodiment.

FIG. 18 is a view corresponding to FIG. 13 according to a sixth modified example of each embodiment.

FIG. 19 is a view corresponding to FIG. 13 according to a seventh modified example of each embodiment.

FIG. 20 is a view corresponding to FIG. 13 according to an eighth modification of each embodiment.

[Explanation of symbols]

 (1) Swing compressor (5) Drive shaft (5a) Eccentric shaft (6) Cylinder (6a) Cylinder chamber (9) Piston (10) Lubrication passage (11) Pump (21) Suction port (22) Discharge port ( 24) Bush hole (24a) Opening (30) Swing bush (31) Blade (34) Low pressure chamber (35) High pressure chamber (36) First void (void) (37) Second void (other void) ( 41), (51) Lubricating oil passage (71) ~ (78) Oil sump groove

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Katsumi Kato 1304 Kanaoka-machi, Sakai City, Osaka Daikin Industry Co., Ltd.Kanaoka Plant, Sakai Factory (72) Katsumi Kawahara 1304, Kanaoka-machi, Sakai City, Osaka Daikin Industry Co., Ltd. Sakai Works Kanaoka Factory (72) Inventor Kenichi Saito 1304 Kanaoka-cho, Sakai City, Osaka Prefecture Daikin Industries, Ltd.Kanaoka Factory Sakai Factory (72) Takashi Hirouchi 1304, Kanaoka-cho, Sakai City, Osaka Prefecture Daikin Industries Co., Ltd. (72) Inventor, founder, 1304 Kanaoka-machi, Sakai City, Osaka Prefecture Daikin Industries, Ltd. Kanaoka Factory, Sakai Plant

Claims (15)

[Claims] 1. A cylinder (6) having a cylinder chamber (6a) in which an intake port (21) and a discharge port (22) are opened, and a cylinder chamber (6a) is closed on both upper and lower sides of the cylinder (6). The upper bearing (7) and the lower bearing (8) that rotatably support the drive shaft (5), and the inner peripheral portion of the drive shaft (5).
Annular piston rotatably fitted to the eccentric shaft part (5a) of
(9), a low pressure chamber (34) and a discharge port (2) that are connected to the outer periphery of the piston (9) in a protruding manner and communicate the cylinder chamber (6a) with the suction port (21).
It is provided between the blade (31) that divides the high pressure chamber (35) leading to 2) and the suction port (21) and discharge port (22) of the cylinder (6), and the cylinder chamber (6a) A bush hole (24) having an opening (24a) that is open, and a swing hole provided in the bush hole (24) to support the protruding tip side of the blade (31) swingably and forward and backward. The swinging bush (32) and the drive shaft (5) are provided at the lower end of the drive shaft (5), and a lubricating oil is introduced into the cylinder chamber (6a) through an oil supply passage (10) extending in the drive shaft (5) in the axial direction. Swing compressor with pump (11) for supplying
In (1), the oil supply passage (10) and the outer peripheral surface of the swing bush (32) and the bush hole (2) that face each other only when the piston (9) revolves.
Between the inner peripheral surface of 4) and the gap (36) between the inner peripheral surface of the oil supply passage (10)
The swing compressor is characterized in that lubricating oil passages (41) and (51) are provided to communicate between the clearance and the gap (36). 2. The lubricating oil passage (41) is provided in the cylinder (6).
Axial lower side housing (8) and cylinder
The swing compressor according to claim 1, wherein the swing compressor is provided so as to straddle (5). 3. The lubricating oil passage (41) is provided so as to open to the inner peripheral surface of the bush hole (24) corresponding to the swing bush (32) through the gap (36). The swing compressor according to claim 1 or 2. 4. The lubricating oil passage (41) is formed in the bush hole (24) closer to the low pressure chamber (35) than the blade (31) corresponding to the swing bush (32) via the gap (36). The swing compressor according to any one of claims 1 to 3, which is provided so as to open only on the inner peripheral surface. 5. The lubricating oil passageway (41) has a swinging bush (32) swingable on the inner peripheral surface of a bush hole (24) corresponding to the swinging bush (32) through the gap (36). The swing compressor according to any one of claims 1 to 4, wherein the swing compressor is provided so as to extend across the moving direction so as to have a single opening or a plurality of openings. 6. A communication space (38) communicating with the gap (36) is provided at a portion of the cylinder (6) corresponding to the protruding tip side of the blade (31), and the communication space (38) is The other gap (36) between the outer peripheral surface of the blade (31) facing each other only when the piston (9) revolves and the supporting surface of the swing bush (32) supporting the blade (31). The swing compressor according to any one of claims 1 to 5, which is in communication with each other. 7. The swing compressor according to claim 6, wherein the lubricating oil passage (41) is provided so as to communicate between the oil supply passage (10) and the communication space (38). 8. The lubricating oil passage (51) is the oil supply passage (10).
And another gap (36) between the outer peripheral surface of the blade (31) and the supporting surface of the swinging bush (32) supporting the blade (31) which correspond to each other only when the piston (9) revolves. It is provided in the blade (31) so as to communicate between them, the other gap (37), the lubricating oil supplied to the other gap (37) is also supplied to the gap (36). 2. The swing compressor according to claim 1, wherein the blade (31) communicates with the clearance (36) from the protruding tip side thereof. 9. The lubricating oil passage (51) is provided with the other gap (37).
The swing compressor according to claim 1, wherein the swing compressor (32) is provided so as to open to the outer peripheral surface of the blade (31) corresponding to the swing bush (32). 10. The lubricating oil passage (51) is provided with the other gap (3).
7. The blade is provided so as to be opened only on the outer peripheral surface of the blade (31) corresponding to the swing bush (32) via the low pressure chamber (35) side via the (7). The swing compressor according to claim 9. 11. The lubricating oil passage (51) is provided with the other gap (3).
7. A single or a plurality of openings are provided on the outer peripheral surface of the blade (31) corresponding to the swinging bush (32) via 7) so as to extend in the advancing and retreating direction. The swing compressor according to any one of claims 8 to 10. 12. The bush hole (24) through the gap (36).
On the outer peripheral surface of the rocking bush (32) corresponding to
The swing compressor according to any one of claims 1 to 11, wherein oil sump grooves (71) to (73) for storing the lubricating oil supplied to 6) are recessed. 13. The oil sump grooves (71) to (73) are provided in the gap.
The rocking bush (3) corresponding to the bush hole (24) through the (36)
13. The swing compressor according to claim 12, wherein the outer peripheral surface of 2) is provided singularly or plurally so as to be continuous in the swinging direction. 14. The blade (3) through the other gap (37).
On the supporting surface of the rocking bush (32) corresponding to (1), another oil sump groove (74) for accumulating the lubricating oil supplied to the other clearance (37).
The swing compressor according to any one of claims 1 to 13, wherein (78) are recessed. 15. The other oil sump grooves (74) to (78) are provided on the supporting surface of the rocking bush (32) corresponding to the blade (31) through the other gap (37), and the blade ( 31. A singular or plural number is provided so as to be continuous in the advancing and retracting direction of 31)
4. The swing compressor according to 4.