JP2006348760A - Compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compressor enabling communization of a screw pin and preventing intrusion of a foreign matter into a screw groove. <P>SOLUTION: The compressor 10 is provided with a communication passage 25 establishing communication between an oil reservoir chamber 18 and a space m. The communication passage 25 is provided with an upstream part 38 arranged in an oil reservoir chamber 18 side and storing the screw pin 27 including screw groove 27c on an outer circumference surface and an upstream part 37 arranged in a space m side. The upstream part 38 is provided with a small diameter part 38a arranged in a downstream part 37 side and including an inner diameter roughly same as an outer diameter of the screw pin 27, and a large diameter part 38b arranged in the oil reservoir chamber 18 side and including an inner diameter larger than the inner diameter of the smaller diameter part 38a. A step part 38c is formed at a connection part of the large diameter part 38b and the small diameter part 38a. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a compressor applied to an air conditioner or the like.

As a compressor applied to an air conditioner or the like, a compressor having a communication path that communicates a bottom portion of an oil storage chamber and a suction side bottom portion of a sealed space at a lower end portion of a fixed scroll is known (for example, Patent Document 1).
Japanese Patent Laying-Open No. 2005-127250 (FIGS. 1 and 2)

In the communication passage of the compressor disclosed in Patent Document 1, a spiral pin having a spiral groove formed on the outer peripheral surface thereof is disposed. This spiral pin has a different standard for each compressor model (type), and a short spiral pin is used for a large capacity compressor, and a long spiral pin is used for a small capacity compressor. Therefore, it is necessary to prepare spiral pins having different lengths for each model of the compressor, which increases the management cost and the manufacturing cost, and there is a possibility of erroneous assembly during assembly work.
Further, the end surface of the spiral pin on the oil reservoir chamber side and the open end of the communication path (that is, the surface 43b on the discharge chamber 45 side of the first end plate portion 43) are positioned on the same plane. In addition, the upstream portion of the communication path that accommodates the spiral pin is configured to have the same inner diameter over substantially the entire length thereof. For this reason, foreign matter such as metal powder and solid lubricant collected in the oil sump chamber may directly enter the spiral groove of the spiral pin, and the spiral groove may be blocked by the foreign matter.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a compressor capable of sharing a spiral pin and preventing entry of foreign matter into the spiral groove. Yes.

The present invention employs the following means in order to solve the above problems.
A compressor according to the present invention includes a housing having a space therein, a compression mechanism disposed in the housing and compressing a fluid taken in the space, and disposed in the housing and discharged from the compression mechanism. An oil separation chamber that separates the lubricating oil mixed in the fluid from the fluid, an oil reservoir chamber that stores the lubricating oil separated by the oil separation chamber, and a communication path that connects the oil reservoir chamber and the space. The communication path is disposed on the oil reservoir chamber side, and is disposed on the space side, an upstream portion in which a spiral pin having a spiral groove on the outer peripheral surface is accommodated. A downstream portion, the upstream portion is disposed on the downstream portion side, a small diameter portion having an inner diameter substantially the same as the outer diameter of the spiral pin, and the small reservoir portion is disposed on the oil sump chamber side. A large-diameter portion having an inner diameter larger than the inner diameter of And, and the connection portions of these large-diameter portion and the small diameter portion is stepped portion formed.
According to such a compressor, even when a spiral pin having a predetermined (constant) standard is used, the stepped portion from the depth of the large diameter portion (for example, one end surface of the fixed scroll (the end surface on the oil reservoir chamber side) It is possible to adjust the amount of oil returning from the oil reservoir to the suction side bottom of the sealed space simply by changing the distance to the bottom. In other words, if only one type of spiral pin with a predetermined (constant) standard is prepared, the return amount of the lubricating oil can be adjusted as necessary depending on how much the large diameter portion is to be dug. Will be able to.
As a result, it is not necessary to prepare a spiral pin having a different standard for each model (model) of the compressor, management costs and manufacturing costs can be reduced, and erroneous assembly during assembly work can be prevented. be able to.
In addition, a large-diameter portion is provided at the inlet side end of the communication path, and a step portion is formed at the connecting portion between the small-diameter portion and the large-diameter portion. Metal particles that have flowed into the large-diameter part through the mesh part of the filtered filter, or foreign matter such as solid lubricant, or between the outer peripheral part of the filter and the inner peripheral part of the large-diameter part. Foreign matter such as metal powder and solid lubricant that has been trapped is captured at this step (that is, the stagnation part formed by the step) and does not reach the spiral groove of the spiral pin. .
This prevents foreign matter such as metal powder and solid lubricant from entering the spiral groove of the spiral pin and prevents the spiral groove from being blocked by the foreign matter. The life of the compressor can be extended, and the reliability and durability can be improved.

Moreover, the said compressor WHEREIN: The longitudinal direction axis line of the said small diameter part can also be comprised so that it may be located above the longitudinal direction axis line of the said large diameter part.
According to such a compressor, it is possible to increase the distance in the vertical direction from the bottom (lowest point) of the oil sump chamber to the longitudinal axis of the small-diameter portion, and foreign matter accumulated at the bottom of the sump chamber , Can be prevented from flowing into the spiral groove of the spiral pin.

Further, in the above compressor, the upper part and the front of the opening end of the large diameter part are covered with the inflow part, and the lubricating oil stored in the oil sump chamber is connected to the opening end of the large diameter part and the inflow part. It can also comprise so that it may flow in into the said large diameter part via the flow path formed between the parts.
According to such a compressor, the upper part and the front of the opening end of the large-diameter part are covered with the inflow part, and the lubricating oil flows into the flow path from the bottom of the oil sump chamber. Therefore, it is possible to prevent the roughness (ripple) of the lubricating oil stored in the oil storage chamber from affecting the flow of the lubricating oil flowing into the large-diameter portion, and to apply the lubricating oil to each sliding portion. It can supply stably, can extend the lifetime of a compressor, and can improve reliability.

Furthermore, in the compressor, a value obtained by dividing a distance between a connection portion connecting the upstream portion and the downstream portion and an end surface on the space side of the communication path by a radius of the spiral pin. , 6 or more and 12 or less.
According to such a compressor, for example, when the communication path is provided in the fixed scroll, the depth of drilling from the other end face side of the fixed scroll can be reduced (shortened).
Accordingly, the fixed scroll can be easily processed, the time required for the processing can be shortened, and the manufacturing cost can be reduced.

  According to the compressor of the present invention, it is possible to share the spiral pin and to prevent the foreign matter from entering the spiral groove.

  Hereinafter, a first embodiment of a compressor according to the present invention (hereinafter referred to as a “scroll compressor”) will be described with reference to the drawings, but the present invention is of course not limited thereto. FIG. 1 is a view showing the scroll compressor 10 of the present embodiment, and is a cross-sectional structural view when seen in a cross section including the axis of the rotation axis. The discharge port 15a, the oil separation chamber 17, and It is the figure which cut the discharge chamber 36 in the part which is easy to understand. Refer to FIGS. 2 and 3 to be described later for the precise positional relationship among the discharge port 15b, the oil separation chamber 17, the oil reservoir chamber 18, and the discharge chamber. 4 is an enlarged view of the lower end portion of the fixed scroll 20 shown in FIG.

  As shown in FIG. 1, the scroll compressor 10 according to this embodiment includes a housing 11 having a sealed space m inside, and a refrigerant gas (fluid) that is disposed in the housing 11 and taken into the sealed space m. The main component is a scroll compression mechanism 12 for compression and a rotating shaft 13 for driving the scroll compression mechanism 12.

The housing 11 includes a front housing 14 and a rear housing 15, which are combined and then coupled with a plurality of bolts (not shown) to form a sealed space m inside. ing. Reference numeral 16 denotes an O-ring that seals the joint portion between the front housing 14 and the rear housing 15 to keep the sealed space m sealed.
A suction port (not shown) for sucking refrigerant gas is formed in a side portion of the rear housing 15 so as to communicate with the sealed space m, and a scroll compression mechanism 12 is provided on an upper rear side of the rear housing 15. And a discharge port 15a for discharging the compressed refrigerant gas after the lubricating oil in the refrigerant gas is separated by the oil separation chamber 17 is formed. Further, the space formed on the lower rear side of the rear housing 15 is a lubricant separated by the oil separation chamber 17 (that is, the lubricant after the scroll compression mechanism 12 is lubricated and the compression chamber C is sealed) LO. It is an oil storage chamber 18 for storing oil.

The oil separation chamber 17 is a cylindrical space. In the oil separation chamber 17, an inner cylinder 19 having a hollow cylindrical shape and a substantially T-shape in cross section is disposed.
In addition, the oil separation chamber 17 is introduced at one end (the end on the discharge port 15a side) so as to guide the refrigerant gas (fluid) compressed by the scroll compression mechanism 12 in the tangential direction of the inner wall surface 17a. A hole 17b is provided. As a result, the refrigerant gas introduced into the oil separation chamber 17 swirls in the circumferential direction in the oil separation chamber 17, and the lubricating oil having a large specific gravity is brought into contact with the inner wall surface 17a by the centrifugal force caused by the swirling. Separated from refrigerant gas. The separated lubricating oil LO moves downward along the inner wall surface 17 a and is stored in the oil storage chamber 18.

The scroll compression mechanism 12 includes a fixed scroll 20 and a turning scroll 21.
The fixed scroll 20 includes a fixed end plate 20a and a spiral wall body 20b erected on the inner surface thereof, and a discharge port 22 is formed at the center of the fixed end plate 20a. The discharge port 22 is opened and closed by a discharge valve 24a attached to the rear surface (back surface) of the fixed end plate 20a via a bolt 23.

  A communication passage 25 that connects the bottom of the oil reservoir 18 and the suction side bottom of the sealed space m is formed at the lower end of the fixed scroll 20. The filter 26 and the spiral pin 27 for flow rate adjustment are arranged. This part will be described in more detail later.

The orbiting scroll 21 includes an orbiting end plate 21a and a spiral wall body 21b standing on the inner surface thereof. An eccentric bush 29 is rotatably fitted through a needle bearing 30 in a boss 28 erected on the outer surface of the turning end plate 21 a, and the rotary shaft 13 is inserted into a hole drilled in the eccentric bush 29. An eccentric pin 13a that protrudes from the end is fitted. A plurality of compression chambers C are formed by causing the fixed scroll 20 and the orbiting scroll 21 to be eccentric from each other by a predetermined distance and engaged with each other while shifting the angle by 180 degrees.
Further, an Oldham ring (spinning prevention mechanism) 31 is provided between the orbiting scroll 21 and the front housing 14, and the orbiting scroll 21 does not rotate around the eccentric bush 29 when the rotating shaft 13 is rotated. It is like that. Accordingly, when the rotary shaft 13 is rotated, the orbiting scroll 21 does not rotate but only performs a revolving orbiting motion. Further, the eccentric bush 29 is provided with a balance weight 32 so as to cancel out the centrifugal force accompanying the revolution of the orbiting scroll 21.

The rotating shaft 13 is a rotor shaft that rotates about its axis by a driving mechanism (not shown) such as an engine or an electric motor, and the above-described eccentric pin 13a having an eccentric axis is projected from the tip thereof. The rotating shaft 13 is supported by a first bearing 33 and a second bearing 34 provided on the front housing 14 side so as to be rotatable around the axis.
Further, for example, an electromagnetic clutch (not shown) is disposed at one end portion (left end portion in FIG. 1) of the rotating shaft 13, and thereby driving force from an engine, an electric motor, or the like (not shown) It is transmitted to the rotating shaft 13 or not transmitted.
In addition, the code | symbol 35 in a figure is an O-ring which seals the junction part between the fixed scroll 20 and the rear housing 15, and maintains the sealed state of the sealed space m.

  In the scroll compressor 10 having such a structure, when an electromagnetic clutch is engaged, a driving force from an engine, an electric motor or the like is transmitted to the rotating shaft 13 and the rotating shaft 13 is rotated, and this rotation is eccentric pin 13a. Then, it is transmitted to the orbiting scroll 21 of the scroll compression mechanism 12 through the eccentric bush 29 and the boss 28. The orbiting scroll 21 is configured to perform a revolving orbiting motion on a circular orbit having a revolution orbiting radius as a radius while being prevented from rotating by the Oldham ring 31.

  Then, the refrigerant gas enters the sealed space m of the housing 11 through the suction port, and is sucked into the compression chamber C of the scroll compression mechanism 12 through a path not shown. Then, as the volume of the compression chamber C decreases due to the revolving orbiting motion of the orbiting scroll 21, the refrigerant gas reaches the center while being compressed, and the lubricating oil LO is discharged from the discharge port 22 through the discharge chamber 36 and the introduction hole 17b. The contained refrigerant is guided into the oil separation chamber 17 and swirled along the inner wall surface 17 a of the oil separation chamber 17. As a result, the lubricating oil LO mixed in the refrigerant falls while being swung along the inner wall surface 17a of the oil separation chamber 17 by the centrifugal separation action, and is stored in the oil reservoir chamber 18, while the lubricating oil LO The separated refrigerant is discharged to the outside of the scroll compressor 10 through the discharge port 15a of the rear housing 15.

Here, the structure in the lower end part of the fixed scroll 20 is demonstrated in detail using FIG. 2 and FIG.
As shown in FIG. 4, the communication passage 25 is provided at the lower end portion of the fixed scroll 20 as described above. The communication passage 25 communicates the bottom of the oil storage chamber 18 with the suction side bottom of the sealed space m, and uses the pressure difference between the pressure on the discharge side and the pressure on the suction side to store the oil sump chamber 18. This is a flow path for returning the lubricating oil LO accumulated inside to the suction side bottom of the sealed space m.

The communication path 25 includes a downstream portion 37 located on the downstream side (the suction side bottom portion side) and an upstream portion 38 located on the upstream side (the oil sump chamber 18 side). The upstream portion 38 is connected in a state in which the longitudinal axis (center axis) of the downstream portion 37 and the longitudinal axis (center axis) of the upstream portion 38 are offset.
The upstream portion 38 includes a small diameter portion 38a having an inner diameter substantially the same as the outer diameter of the spiral pin 27, and a large diameter portion 38b having an inner diameter larger than the inner diameter of the small diameter portion 38a. The small-diameter portion 38a and the large-diameter portion 38b are arranged on the upstream side so that their longitudinal axes substantially coincide (that is, the central axis of the small-diameter portion 38a and the central axis of the large-diameter portion 38b substantially coincide). The large diameter portion 38b and the small diameter portion 38a are formed in this order, and a step portion 38c is formed at the connecting portion between the small diameter portion 38a and the large diameter portion 38b. That is, as shown in FIG. 2, which is a cross-sectional view taken along the line II-II in FIG. 1, a small diameter portion 38a is formed at a substantially central portion of the large diameter portion 38b. The spiral pin 27 is press-fitted into the small diameter part 38a, and the filter 26 is press-fitted into the large diameter part 38b. In order to make the drawing easier to see, the bolt 23, the discharge valve 24a, the retainer 24, the filter 26, and the spiral pin 27 are not drawn in FIG.

  As shown in FIG. 4, the spiral pin 27 is a member having a substantially cylindrical shape. Tapered portions 27 a are formed at both ends, and a spiral is formed on the side surface of the main body portion 27 b excluding these tapered portions 27 a. A groove 27c (hereinafter referred to as "spiral groove") 27c is cut. The lubricating oil LO that has passed through the filter 26 once flows out into the downstream portion 37 located on the downstream side of the spiral pin 27 through the spiral groove 27c, and then passes through the downstream portion 37 to the suction side of the sealed space m. It is made to flow out to the bottom, and is stirred (raised up) by the orbiting scroll 21 and mixed into the refrigerant gas before compression, so that the compression mechanism 12 is lubricated and the sealed space m is sealed. It has become.

According to the scroll compressor 10 according to the present embodiment, even when the spiral pin 27 having a predetermined (constant) standard is used, when the fixed scroll 20 is manufactured, the depth of the large-diameter portion 38b (the fixed scroll 20 It is possible to adjust the amount of oil returning from the oil reservoir chamber 18 to the suction side bottom of the sealed space m only by changing the one end surface (the distance from the end surface on the oil reservoir chamber 18 side) to the stepped portion 38c. That is, for example, if only one type of spiral pin 27 having a predetermined (constant) standard is prepared, the amount of return of the lubricating oil is appropriately determined depending on how much the large diameter portion 38b is dug. Can be adjusted.
As a result, it is not necessary to prepare a spiral pin having a different standard for each model (model) of the compressor, management costs and manufacturing costs can be reduced, and erroneous assembly during assembly work can be prevented. be able to.

Further, since the large diameter portion 38b is provided at the inlet side end portion of the communication passage 25 and the step portion 38c is formed at the connecting portion between the small diameter portion 38a and the large diameter portion 38b, the filter 26 is temporarily provided. The large-diameter portion 38b from the outer periphery of the filter 26 and the inner peripheral portion of the large-diameter portion 38b or foreign matter such as metal powder or solid lubricant that has flowed into the large-diameter portion 38b through the mesh portion. Foreign matter such as metal powder or solid lubricant that has flowed into the inside is captured at this step portion 38c (that is, the stagnation portion formed by the step portion 38c), and until the spiral groove 27c of the spiral pin 27 is reached. Not to reach.
As a result, it is possible to prevent foreign matter such as metal powder and solid lubricant from entering the spiral groove 27c of the spiral pin 27 and blocking the spiral groove 27c with the foreign matter, and lubricate each sliding portion. The oil LO can be reliably supplied, the life of the compressor can be extended, and the reliability and durability can be improved.

Further, by providing the large diameter portion 38b at the inlet side end portion of the communication passage 25, the small diameter portion 38a and the large diameter portion from the other end surface (end surface on the suction side) of the fixed scroll 20 are obtained. A value obtained by dividing the length L to the connection portion with the portion 38b by the radius d of the spiral pin 27 can be reduced (for example, 6 or more and 12 or less) (see FIG. 4). In other words, when manufacturing the fixed scroll 20, the depth of drilling from the other end surface side of the fixed scroll 20 can be reduced (shortened).
Thereby, the processing of the fixed scroll 20 becomes easy, the time required for the processing can be shortened, and the manufacturing cost can be reduced.

A second embodiment of the scroll compressor according to the present invention will be described with reference to FIG.
The scroll compressor according to the present embodiment is different from that of the first embodiment described above in that an inflow portion 39 is provided on the upstream side of the large diameter portion 38b. Since other components are the same as those in the above-described embodiment, description of these components is omitted here.
In addition, the same code | symbol is attached | subjected to the member same as 1st Embodiment mentioned above.

  As shown in FIG. 3, the inflow portion 39 includes a flow path 39 a for guiding the lubricating oil LO stored in the oil storage chamber 18 to the opening end of the large diameter portion 38 b, and is integrated with the rear housing 15. Is formed. The end surface 39b of the inflow portion 39 comes into contact with an end surface (one end surface) in which the open end of the large diameter portion 38b is formed in a state where the fixed scroll 20 is incorporated in the rear housing 15. That is, the shape is such that the upper part and the front (right side in FIG. 1) of the open end of the large diameter part 38 b are covered with the inflow part 39. In other words, the lubricating oil LO stored in the oil storage chamber 18 is guided through the flow path 39 to the large diameter portion 38b.

  According to the scroll compressor according to the present embodiment, the upper part and the front of the opening end of the large-diameter part 38b are covered by the inflow part 39, and the lubricating oil LO enters the flow path 39a from the bottom of the oil sump chamber 18. Since the oil flows in, the roughening of the oil surface of the lubricating oil LO stored in the oil storage chamber 18 is prevented from affecting the flow of the lubricating oil LO flowing into the large diameter portion 38b. Thus, the lubricating oil LO can be stably supplied to each sliding portion, the life of the compressor can be extended, and the reliability can be improved.

In addition, this invention is not limited to the thing of embodiment mentioned above, For example, the central axis (longitudinal axis) of the small diameter part 38a is upwards rather than the central axis (longitudinal axis) of the large diameter part 38b. It is more preferable that it is configured to be positioned.
As a result, the distance in the vertical direction from the bottom (lowest point) of the oil reservoir chamber 18 to the central axis of the small diameter portion 38a can be increased, and the foreign matter accumulated in the bottom of the oil reservoir chamber 18 by the lubricating oil LO. It is possible to prevent the spiral pin 27 from flowing into the spiral groove 27c.

Further, it is more preferable that the entire communication path 25 is configured to be positioned above the above-described embodiment.
Thereby, the distance in the vertical direction from the bottom (lowest point) of the oil sump chamber 18 to the central axis of the small diameter portion 38a can be further increased, and the foreign matter accumulated at the bottom of the sump chamber 18 is spirally It is possible to more reliably prevent the pin 27 from flowing into the spiral groove 27c.

Furthermore, the scroll compressor described above can be not only a hermetic type as described above but also a semi-hermetic type or an open type scroll compressor.
In addition, the scroll compressor described above can be used not only for vehicle installation as described above but also for stationary installation.
Furthermore, the compressor is not limited to the scroll compressor as described above, and may be a swash plate compressor, a reciprocating compressor, or the like.
Furthermore, the compressor is not limited to the horizontal type as described above, but may be a vertical type.

It is a figure which shows 1st Embodiment of the compressor by this invention, Comprising: It is a cross-section figure at the time of seeing in the cross section containing the axis line of the rotating shaft. It is the II-II arrow sectional drawing of FIG. It is a figure which shows 2nd Embodiment of the compressor by this invention, Comprising: It is a figure corresponded in the III-III arrow sectional drawing of FIG. It is the principal part expanded sectional view which expanded the principal part of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Scroll compressor 11 Housing 12 Compression mechanism 17 Oil separation chamber 18 Oil sump chamber 25 Communication path 27 Spiral pin 27c Spiral groove 37 Downstream part 38 Upstream part 38a Small diameter part 38b Large diameter part 38c Step part 39 Inflow part 39a Flow path LO Lubrication Oil m sealed space

Claims (4)

A housing having a space inside;
A compression mechanism that is disposed within the housing and compresses a fluid taken into the space;
An oil separation chamber that is disposed in the housing and separates lubricating oil mixed in the fluid discharged from the compression mechanism from the fluid;
An oil sump chamber for storing lubricating oil separated by the oil separation chamber;
A compressor comprising a communication passage communicating the oil sump chamber and the space,
The communication path is disposed on the oil reservoir chamber side, and includes an upstream portion in which a spiral pin having a spiral groove on the outer peripheral surface is accommodated, and a downstream portion disposed on the space side,
The upstream portion is disposed on the downstream portion side, and has a small diameter portion having an inner diameter substantially the same as the outer diameter of the spiral pin, and is disposed on the oil sump chamber side, and has an inner diameter larger than the inner diameter of the small diameter portion. And a step portion is formed at a connecting portion between the large diameter portion and the small diameter portion.   2. The compressor according to claim 1, wherein a longitudinal axis of the small diameter portion is configured to be located above a longitudinal axis of the large diameter portion.   The upper end and the front of the opening end of the large diameter portion are covered with an inflow portion, and the lubricating oil stored in the oil sump chamber is formed between the opening end of the large diameter portion and the inflow portion. The compressor according to claim 1 or 2, wherein the compressor flows into the large-diameter portion via a flow path.   A value obtained by dividing the distance between the connecting portion connecting the upstream portion and the downstream portion and the end surface of the communication path on the space side by the radius of the spiral pin is 6 or more and 12 or less. The compressor according to any one of claims 1 to 3, wherein the compressor is set.

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