JP2009013795A - Reciprocating compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reciprocating compressor provided with a lip ring capable of ensuring sealability even in significant power/high pressure specification. <P>SOLUTION: This reciprocating compressor includes: a cylinder; a piston reciprocating while swinging in the cylinder and defining a compression chamber in the cylinder; and the annular lip ring 30 provided in the piston and sealing a portion between the piston and the cylinder. The lip ring 30 is formed with a plurality of layers 30A, 30B which are different respectively on the side abutting on the inner peripheral surface of the cylinder and on the side not abutting thereon. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an oscillating lip ring reciprocating compressor suitably used for compressing a gas such as air.

A reciprocating compressor that compresses gas has a configuration in which a crank is eccentrically attached to a rotational drive shaft of a drive source such as a motor, and a connecting rod-integrated piston is rotatably connected to the crank via a bearing. is there. In this oscillating lip ring reciprocating compressor, an annular lip ring is attached to a piston so as to hermetically seal between the piston and the cylinder. Then, when the crank is eccentrically rotated by the rotation of the rotation drive shaft, the piston reciprocates while swinging in the cylinder, and sucks, compresses and discharges the gas (see, for example, Patent Document 1). .
JP 2003-161260 A

  In such a reciprocating compressor, when a high output / high pressure specification that generates a compressed gas with a high pressure (for example, 1.0 MPa or more) is used, the cylinder inner diameter is large and the stroke is large. The gap with the piston becomes large. In addition, since the stroke and the swing angle of the piston are increased and the piston is pushed by the high-pressure compressed gas, the lip ring is deformed and partially falls into the gap between the piston and the cylinder. For these reasons, there is a possibility that the sealing by the lip ring becomes insufficient. Further, since the swing angle becomes large, the lip ring is easily damaged by repeated bending. For this reason, it is difficult to put a large output and high pressure specification into practical use in a piston swing type reciprocating compressor using a lip ring, and to a product with a lower pressure level (for example, 0.7 to 0.8 MPa). Application is restricted. Further, when a lip ring is formed by blending a reinforcing material or the like so as to withstand high pressure, the lip ring is more aggressive against the inner surface of the cylinder and damages the cylinder. As a result, the sealing performance may still be insufficient.

  However, a piston swing type reciprocating compressor using a lip ring has various merits such as a small number of component parts, low cost manufacturing, low noise, and high reliability. Therefore, there is a demand for practical use of a high output and high pressure specification in a swinging lip ring reciprocating compressor using a lip ring.

  Therefore, an object of the present invention is to provide a reciprocating compressor provided with a lip ring capable of ensuring sealing performance even in a high output / high pressure specification.

  In order to achieve the above object, an invention according to claim 1 includes a cylinder, a piston that reciprocates while swinging in the cylinder, and defines a compression chamber in the cylinder, and the piston provided in the piston. And an annular lip ring that seals between the cylinder and the cylinder, the lip ring has different compositions on the contact side and the non-contact side with the inner peripheral surface of the cylinder. It is characterized by being formed in a plurality of layers.

  The invention according to claim 2 is the invention according to claim 1, wherein the lip ring has at least one of spherical carbon, graphite, bronze, and molybdenum disulfide as a layer on the contact side with the inner peripheral surface of the cylinder. It is made of a composite material made of polytetrafluoroethylene containing one, and the layer on the non-contact side with the inner peripheral surface of the cylinder is made of a composite material containing polytetrafluoroethylene containing at least high-strength fibers. It is characterized by that.

  The invention according to claim 3 is the invention according to claim 1 or 2, characterized in that the lip ring is integrally formed.

  According to a fourth aspect of the present invention, there is provided a cylinder, a piston that reciprocates while oscillating in the cylinder, defines a compression chamber in the cylinder, and seals between the piston and the cylinder provided in the piston. In the reciprocating compressor provided with an annular lip ring, the lip ring is integrally formed with a reinforcing material interposed therein.

  The invention according to claim 5 is characterized in that, in the invention according to claim 4, the reinforcing material is interposed on the non-contact side of the lip ring with the inner peripheral surface of the cylinder.

  According to the invention of claim 1, since the lip ring is formed in a plurality of layers having different compositions on the contact side and the non-contact side with the inner peripheral surface of the cylinder, for example, the inner peripheral surface of the cylinder It is possible to make the contact side with the layer excellent in slidability and the non-contact side into a high-strength layer. This prevents the lip ring from being deformed by being pressed by the high-pressure compressed gas with the high-strength non-contacting layer, while making the abutting layer excellent in slidability to attack the cylinder inner surface. It becomes possible to eliminate. As a result, it is possible to ensure the sealing performance of the lip ring even for high output and high pressure specifications. Therefore, even a high output / high pressure specification in which the stroke and the swing angle of the piston are increased can be put to practical use.

According to the invention of claim 2, the lip ring is a polytetrafluorocarbon in which the layer on the contact side with the inner peripheral surface of the cylinder contains at least one of spherical carbon, graphite, bronze, and molybdenum disulfide. Highly slidable layer made of a composite material made of ethylene, and the layer on the non-contact side with the inner peripheral surface of the cylinder is made of a composite material containing polytetrafluoroethylene containing at least high-strength fibers. Therefore, the high-strength non-contact layer prevents the lip ring from being deformed by being pressed by the high-pressure compressed gas, and the contact-side layer with excellent slidability is applied to the cylinder inner surface. Aggressiveness can be eliminated. As a result, the sealing performance of the lip ring can be secured even for high output and high pressure specifications.
In FIG. 4, the contact side 30A and the non-contact side 30B have the same thickness, but 30A and 30B have different dimensions depending on the specifications of the compressor to be applied (cylinder diameter, discharge pressure, etc.). It is also possible.

  According to the invention which concerns on Claim 3, since a lip ring is integrally molded, manufacture becomes easy and peeling of each layer can be prevented.

  According to the invention according to claim 4, since the lip ring is integrally formed with a reinforcing material interposed therein, for example, even if a portion other than the reinforcing material is formed of a material having excellent slidability, High strength can be achieved with the internal reinforcing material. As a result, the lip ring can be prevented from being deformed by being pressed by the high-pressure compressed gas, and the aggressiveness to the cylinder inner surface can be eliminated at a portion having excellent slidability other than the reinforcing material. . As a result, it is possible to ensure the sealing performance of the lip ring even for high output and high pressure specifications. Therefore, even a high output / high pressure specification in which the stroke and the swing angle of the piston are increased can be put to practical use.

  According to the fifth aspect of the present invention, since the reinforcing material is interposed on the non-contact side of the lip ring with the inner peripheral surface of the cylinder, the lip ring has a contact side with the inner peripheral surface of the cylinder. Even if wear occurs, the time until the reinforcing material is exposed becomes longer, and the service life can be extended. Therefore, the maintenance cycle for exchanging lip rings can be lengthened.

A reciprocating compressor 10 according to a first embodiment of the present invention will be described below with reference to FIGS.
In FIG. 1, reference numeral 11 denotes a cylindrical cylinder made of an aluminum alloy. A cylinder head 12 is provided on the upper end side of the cylinder 11, and a suction chamber A and a discharge chamber B are separated by a partition wall 13 in the cylinder head 12. Is defined.

  Reference numeral 14 denotes a valve plate provided between the cylinder 11 and the cylinder head 12. Gaskets (not shown) are provided between the valve plate 14 and the cylinder 11 and between the valve plate 14 and the cylinder head 12. Etc. are hermetically sealed. A compression chamber C is defined between a valve plate 14 in the cylinder 11 and a swing piston 19 described later via a lip ring 30 described later. Further, the space located on the opposite side of the lip ring 30 in the cylinder 11 is a connecting rod housing chamber D.

  Reference numeral 15 is a suction port provided in the valve plate 14, and this suction port 15 communicates the suction chamber A and the compression chamber C. Reference numeral 16 denotes a discharge port provided in the valve plate 14. The discharge port 16 communicates the discharge chamber B and the compression chamber C with each other.

  Reference numeral 17 is a suction valve provided on the valve plate 14 between the suction chamber A and the compression chamber C. The suction valve 17 has a swing piston 19 to be described later from the top dead center to the bottom dead center. Opens when moving, and closes when moving from bottom dead center to top dead center.

  Reference numeral 18 is a discharge valve provided on the valve plate 14 between the discharge chamber B and the compression chamber C. The discharge valve 18 moves the swing piston 19 from the bottom dead center to the top dead center. Sometimes it opens and closes when moving from top dead center to bottom dead center.

  Reference numeral 19 denotes a swinging piston provided in the cylinder 11 so as to be capable of reciprocating movement. The swinging piston 19 has one end side in the axial direction via a crankshaft and the like, such as an output shaft of a rotational drive source (both in FIG. 1). A connecting rod portion 20 connected to the connecting rod portion 20, a disc-shaped retainer 23 fastened by a plurality of bolts 22 to a disc portion 21 provided on the other end side of the connecting rod portion 20 in the axial direction; It is constituted by. The disc portion 21, the bolt 22 and the retainer 23 constitute a piston portion 24.

  Here, the disc portion 21 of the connecting rod portion 20 has a recess 25 at the center, and an annular edge 26 around the recess 25. Further, the retainer 23 has a fitting convex portion 27 fitted into the concave portion 25 of the connecting rod portion 20 at the center thereof, and an annular edge portion 28 around the fitting convex portion 27.

  Reference numeral 30 denotes a lip ring fixedly provided on the outer peripheral side of the piston portion 24. The lip ring 30 is formed in a bottomed cup shape as shown in FIG. The lip ring 30 is located on the inner peripheral side and is fixed to the piston portion 24 by being clamped between the annular edge portion 26 of the connecting rod portion 20 and the annular edge portion 28 of the retainer 23 by fastening the bolt 22. The plate-shaped annular mounting portion 31 and the annular lip portion 32 that protrudes radially outward from the annular mounting portion 31 and bends along the inner peripheral surface of the cylinder 11 so as to cover the outer peripheral side of the retainer 23. ing. The lip ring 30 is positioned on the retainer 23 by an inlay on the inner peripheral side of the annular mounting portion 31.

  The lip ring 30 hermetically seals between the cylinder 11 and the piston portion 24 by the annular lip portion 32 receiving the internal pressure of the cylinder 11 and slidingly contacting the inner peripheral surface of the cylinder 11 with a tightening margin.

  Such a oscillating lip ring reciprocating compressor 10, as schematically shown in FIG. 3, causes an eccentric rotational movement of the crankshaft 40 of the crank mechanism via a grease-filled ball bearing 41. The oscillating piston 19 and the lip ring 30 that are rotatably supported in the cylinder 11 reciprocate in the cylinder axial direction in the cylinder 11, and in the intake stroke, the piston portion 24 of the oscillating piston 19 and the cylinder head of the lip ring 30. The compression chamber C is expanded by the movement in the direction opposite to 12, and the suction valve 17 is opened while the discharge valve 18 is closed to introduce air into the compression chamber C from the suction chamber A. In the subsequent compression stroke, the compression chamber C is reduced by the movement of the piston portion 24 and the lip ring 30 in the direction of the cylinder head 12, and the discharge valve 18 is opened while the suction valve 17 is closed, and compressed air is discharged from the compression chamber C. Discharge into chamber B.

During the above operation, the piston portion 24 of the swing piston 19 reciprocates while swinging in the cylinder 11.
That is, when viewed along the crankshaft direction, the connecting rod portion 20 is located at the center in the left-right direction at the bottom dead center where the compression chamber C is expanded most, and the piston portion 24 is horizontal. When the crankshaft 40 is rotated to perform the compression stroke, the swinging piston 19 is raised, and the piston portion 24 is moved in a direction to reduce the compression chamber C, the connecting rod portion 20 reaches the middle between the top dead center and the bottom dead center. The lower part of the rod rises while moving to one side in the left-right direction, and the lower part of the connecting rod part 20 is located on the outer side of the middle between the top dead center and the bottom dead center (for example, a position rotated 90 degrees from the bottom dead center). To do. At this time, the piston portion 24 is most inclined with respect to the horizontal.

  Subsequently, the lower part of the connecting rod portion 20 returns to the center in the left-right direction as it goes to the top dead center, and the connecting rod portion 20 is located at the center in the left-right direction at the top dead center where the compression chamber C is most contracted. At the same time, the piston portion 24 becomes horizontal and the compression stroke is completed.

  When the crankshaft 40 is rotated to perform the suction stroke from the state where the piston portion 24 is at the top dead center, the swinging piston 19 moves the piston portion 24 in the direction in which the compression chamber C is expanded. The lower part of the connecting rod 20 moves down to the middle of the dead center while moving in the opposite direction to the left and right, and is the most connected in the middle of the top dead center and the bottom dead center (for example, a position rotated 90 degrees from the top dead center). The lower part of the rod part 20 is located on the other outer side. At this time, the piston part 24 is inclined in the direction opposite to the above with respect to the most horizontal.

  Subsequently, the lower part of the connecting rod part 20 returns to the center in the left-right direction as it goes to the bottom dead center, and the connecting rod part 20 is located at the center in the left-right direction at the bottom dead center where the compression chamber C is expanded most. At the same time, the piston portion 24 becomes horizontal and the suction stroke is completed.

  In the oscillating lip ring reciprocating compressor 10 according to the first embodiment, the lip ring 30 described above is in contact with the inner peripheral surface of the cylinder 11 as shown in FIG. 30 A of side layers and the non-contact side layer 30B used as the non-contact side which is not contact | abutted with the internal peripheral surface of the cylinder 11 are formed in two layers from which the property differs. Here, the contact side layer 30A is continuously formed from the side opposite to the annular lip portion 32 in the axial direction of the annular mounting portion 31 to the outer peripheral side of the annular lip portion 32, and the non-contact side layer 30B. Is formed continuously from the annular lip portion 32 side in the axial direction of the annular mounting portion 31 to the inner peripheral side of the annular lip portion 32.

  The abutting side layer 30A is made of polytetrafluoroethylene, which is a self-lubricating resin, as a base material, and spherical carbon, graphite, bronze for imparting a characteristic that the sliding resistance value is small and the slidability is excellent. , Composed of a composite material to which at least one of molybdenum disulfide is added as a filler (not including high-strength fibers having high hardness such as carbon fiber and glass fiber). In other words, the contact side layer 30A is intended to improve the slidability and has less aggressiveness against the cylinder 11 made of an aluminum alloy. That is, the alumite on the sliding surface of the cylinder 11 is polished or scratched. It consists of a self-lubricating composite material with a composition that does not stap.

  The non-contact side layer 30B is made of a composite material in which polytetrafluoroethylene is used as a base material and carbon fibers are added as a filler to the base material. That is, the non-contact side layer 30B receives the cylinder internal pressure, suppresses deformation against the cylinder internal pressure, and prevents the lip ring 30 from partially falling into the gap between the piston portion 24 and the cylinder 11 caused by swinging. In addition, the flexibility of the annular lip portion 32 by the swinging motion is improved, and a filler for the purpose of preventing damage to repeated bending is added, and a self-lubricating composition with excellent tensile strength and flexibility is added. Made of composite material. The carbon fiber of the non-contact side layer 30B may be a high-strength fiber, and may be glass fiber, aramid fiber, or the like having high hardness.

  Here, the lip ring 30 having a two-layer structure including the contact side layer 30A and the non-contact side layer 30B is integrally formed. That is, as shown in FIG. 5, it comprises a cylindrical main mold 50, a columnar upper mold 51 fitted inside the main mold 50, and a columnar lower mold 52 fitted inside the main mold 50. The compounded powder PA constituting the composite material of the abutting side layer 30A and the blended powder PB constituting the composite material of the non-contacting side layer 30B are stacked and filled in the mold 53 as shown in FIG. As shown in FIG. 4, the upper mold 51 and the lower mold 52 are integrated by applying a necessary load and performing pressure molding.

  At this time, the blended powders PA and PB to be stacked are stacked and filled in the mold 53 with a mass determined by the specific gravity and dimensions at the time of completion. As a result, a sheet-like lip ring material 30 ′ having two layers having different functions (properties) in the thickness direction is obtained. The lip ring material 30 ′ thus integrated is formed into a shape having the annular mounting portion 31 and the annular lip portion 32 by performing a punching process and a drawing process. In addition, the center hole of the lip ring 30 may be formed by a die at the time of integral molding instead of punching.

  The lip ring 30 in which the contact-side layer 30A and the non-contact-side layer 30B are integrated as described above does not peel off the contact-side layer 30A and the non-contact-side layer 30B later by an external force, and is in a compressed state. The same applies to. In addition, although the member which made the polytetrafluoroethylene a base material is difficult to integrate after shaping | molding, it can be easily and reliably made into a two-layer integrated structure by manufacturing as mentioned above. Further, the lip ring 30 may have a structure of three or more layers, and in any case, it can be similarly formed.

  According to the reciprocating compressor 10 of the first embodiment described above, the lip ring 30 is formed in two layers 30A and 30B that are different on the contact side and the non-contact side with the inner peripheral surface of the cylinder 11. The contact side layer 30A on the contact side with the inner peripheral surface of the cylinder 11 is made of a composite material made of polytetrafluoroethylene containing at least one of spherical carbon, graphite, bronze, and molybdenum disulfide. The self-lubricating resin layer having excellent slidability is obtained, and the non-contacting side layer 30B on the non-contacting side with the inner peripheral surface of the cylinder 11 is a composite containing polytetrafluoroethylene containing at least high-strength fibers. Since the high-strength layer is made of a material, the lip ring 30 is prevented from being deformed by being pressed by a high-pressure compressed gas, while the high-strength non-contact side layer 30B suppresses the lip ring 30 and is excellent in slidability. 30A It is possible to eliminate the attack of the internal surface of Sunda 11. As a result, the sealing performance of the lip ring 30 can be ensured even with high output and high pressure specifications. Therefore, even if the stroke and the swing angle of the swing piston 19 are large, this can be put into practical use.

  In other words, with conventional lip rings made of a single material, when slidability is pursued, there is a problem in strength and flexibility, and sealing performance cannot be secured, so it is impossible to increase the output and pressure of a reciprocating compressor. On the other hand, when emphasis is placed on strength and flexibility, it is necessary to fill with high-hardness fillers such as high-strength fibers, so that the inner surface of the cylinder is attacked and wear and scratches on the sliding surface occur. Although the life of the lip ring is significantly shortened and a problem occurs in the sealing performance, the lip ring 30 according to the first embodiment satisfies both the slidability and the conflicting properties of strength and flexibility at the same time. It will be possible.

  As described above, the advantage of the piston swinging type using the lip ring can be obtained even when the output is increased and the pressure is increased. That is, since expensive components such as piston rings, rider rings, pistons, needle bearings, piston pins, and oil seals can be significantly reduced, the number of components can be reduced and manufacturing can be made at low cost. In addition, the need for a needle bearing between them, which is necessary in the case of a so-called piston type in which the piston swings separately from the connecting rod with no oil supply, increases reliability and lengthens the maintenance cycle. it can. There is no bearing impact noise due to piston slapping noise and needle bearing clearance, and noise can be reduced.

  In addition to the above, since the lip ring 30 is integrally formed, manufacturing is facilitated and peeling of the layers 30A and 30B can be prevented.

  A specific composition of the contact side layer 30A is illustrated below.

  The specific composition of the non-contact side layer 30B is illustrated below.

  Next, a reciprocating compressor according to a second embodiment of the present invention will be described below with reference mainly to FIGS. 7 to 10 and focusing on differences from the first embodiment.

  In the second embodiment, the lip ring 30 is different from the first embodiment. That is, the lip ring 30 of the second embodiment is shaped like a bottomed cup having an annular mounting portion 31 and an annular lip portion 32 in the same manner as in the first embodiment, but the main configuration The reinforcing member 56 is interposed inside the portion 55 and is integrally formed.

  The main component 55 of the lip ring 30 of the second embodiment is made of polytetrafluoroethylene, which is a self-lubricating resin, as a base material, all of which have a small sliding resistance value and excellent slidability. It consists of a composite material with at least one of spherical carbon, graphite, bronze, and molybdenum disulfide added as a filler (not including high-strength fibers with high hardness such as carbon fiber and glass fiber) . In other words, the main component 55 is intended to improve the slidability and is less aggressive against the cylinder 11 made of an aluminum alloy, that is, the alumite on the sliding surface of the cylinder 11 is polished or scratched. It consists of a self-lubricating composite material with a composition that does not loosen.

  A reinforcing material 56 is interposed at the intermediate position in the thickness direction of the main component 55. The reinforcing material 56 is made of carbon fiber, glass fiber, or aramid fiber having excellent tensile strength and flexibility, and has a net shape. That is, the reinforcing member 56 also suppresses deformation of the lip ring 30 with respect to the cylinder internal pressure, prevents the lip ring 30 from partially falling into the gap between the piston portion 24 and the cylinder 11, and an annular shape caused by a swinging motion. It is embedded in the lip ring 30 for the purpose of improving the flexibility of the lip portion 32.

  Here, also in the lip ring 30 of the second embodiment, the main component 55 and the reinforcing material 56 are integrally formed. That is, as shown in FIG. 8, the mixed powder P of the main component 56, which is about half of the main mold 50, the upper mold 51, and the lower mold 52, as in the first embodiment, The reinforcing material 56 and the blended powder P of about half of the main component 56 are stacked and filled in this order, and as shown in FIG. 9, the upper mold 51 and the lower mold 52 are subjected to pressure molding by applying a necessary load. Turn into. As a result, a sheet-like lip in which main components 55 of self-lubricating resin excellent in slidability are integrated on both sides of the net-like reinforcing material 56 via the mesh of the net of the reinforcing material 56. A ring material 30 'is obtained. The lip ring material 30 ′ thus integrated is formed into a shape having the annular mounting portion 31 and the annular lip portion 32 by punching and drawing to obtain the lip ring 30.

  According to the second embodiment described above, since the lip ring 30 is integrally formed with the reinforcing material 56 interposed therein, the main component 55 other than the reinforcing material 56 is made of spherical carbon, graphite, Even if it is made of a self-lubricating resin material that is made of a composite material made of polytetrafluoroethylene containing at least one of bronze and molybdenum disulfide, it has high strength with the internal reinforcing material 56. Can do. This prevents the lip ring 30 from being pushed by the high-pressure compressed gas and deformed by the reinforcing material 56, and eliminates the aggressiveness to the cylinder inner surface by the main component 55 having excellent slidability other than the reinforcing material 56. can do. As a result, the sealing performance of the lip ring 30 can be ensured even with high output and high pressure specifications. Therefore, even if the stroke and the swing angle of the swing piston 19 are large, this can be put into practical use.

  In the second embodiment, the mold 53 is laminated and filled with more than half of the mixed powder P of the main component 56, the net-like reinforcing material 56, and less than half of the mixed powder P of the main component 56 in this order. When the upper mold 51 and the lower mold 52 are integrally formed by applying a necessary load and press-molding, and punching and drawing are performed, the reinforcing material 56 is attached to the lip ring 30 as shown in FIG. The cylinder 11 can be disposed so as to be biased toward the non-contact side with the inner peripheral surface of the cylinder 11.

  By configuring in this way, the resistance force during the drawing process by the reinforcing material 56 can be reduced, so that the moldability of the drawing process is improved.

  Further, even if wear occurs on the contact side of the lip ring 30 with the inner peripheral surface of the cylinder 11, the time until the reinforcing material 56 is exposed becomes longer, and the life can be extended. Therefore, the maintenance cycle for exchanging lip rings can be lengthened.

It is sectional drawing which shows the principal part of the reciprocating compressor of 1st Embodiment of this invention. It is the top view (a) and sectional drawing (b) which show the lip ring of the reciprocating compressor of 1st Embodiment of this invention. It is a mimetic diagram showing roughly the reciprocating compressor of a 1st embodiment of the present invention. It is a partial expanded sectional view which shows the lip ring of the reciprocating compressor of 1st Embodiment of this invention. It is the top view (a) and sectional drawing (b) of the metal mold | die which manufactures the lip ring of the reciprocating compressor of 1st Embodiment of this invention. It is the top view (a) and sectional drawing (b) of the metal mold | die which manufactures the lip ring of the reciprocating compressor of 1st Embodiment of this invention. It is a partial expanded sectional view which shows the lip ring of the reciprocating compressor of 2nd Embodiment of this invention. It is the top view (a) and sectional drawing (b) of the metal mold | die which manufactures the lip ring of the reciprocating compressor of 2nd Embodiment of this invention. It is the top view (a) and sectional drawing (b) of the metal mold | die which manufactures the lip ring of the reciprocating compressor of 2nd Embodiment of this invention. It is a partial expanded sectional view which shows the modification of the lip ring of the reciprocating compressor of 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Reciprocating compressor 11 Cylinder 24 Piston 30 Lip ring 30A Contact side layer 30B Non-contact side layer 31 Annular attachment part 32 Annular lip part 56 Reinforcement material C Compression chamber

Claims (5)

A cylinder,
A piston that reciprocates while swinging in the cylinder and defines a compression chamber in the cylinder;
An annular lip ring provided on the piston and sealing between the piston and the cylinder;
In the reciprocating compressor provided with the reciprocating compressor, the lip ring is formed in a plurality of layers having different compositions on a contact side and a non-contact side with the inner peripheral surface of the cylinder. Machine.   The lip ring is made of a composite material made of polytetrafluoroethylene in which the layer on the contact side with the inner peripheral surface of the cylinder contains at least one of spherical carbon, graphite, bronze, and molybdenum disulfide, The reciprocating compressor according to claim 1, wherein the layer on the non-contact side with the inner peripheral surface of the cylinder is made of a composite material containing polytetrafluoroethylene containing at least high-strength fibers.   The reciprocating compressor according to claim 1, wherein the lip ring is integrally formed. A cylinder,
A piston that reciprocates while swinging in the cylinder and defines a compression chamber in the cylinder;
An annular lip ring provided on the piston and sealing between the piston and the cylinder;
In a reciprocating compressor equipped with
2. The reciprocating compressor according to claim 1, wherein the lip ring is integrally formed with a reinforcing material interposed therein.   The reciprocating compressor according to claim 4, wherein the reinforcing member is interposed on a non-contact side of the lip ring with the inner peripheral surface of the cylinder.

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