JP2016223338A - Compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compressor for securing its reliability while reducing its weight by solving such a problem on a conventional compressor that an increase in the inner pressure and a reduction in the size and weight are promoted for improving workability and reducing workloads, and market needs are satisfied in terms of the maximum pressure but a further reduction in the size and weight is required for improving the workability.SOLUTION: The compressor includes an integrated piston 32 having a low pressure side piston which is reciprocated in a cylinder 3 on the low pressure side and a high pressure side piston which is reciprocated in a cylinder 4 on the high pressure side, integrally formed, and a connecting rod 11 for reciprocating the integrated piston via the small end. On both the low pressure side piston and the high pressure side piston of the integrated piston, lip rings 33, 34 are provided by which the cylinders are subjected to sealing.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a compressor body structure of a compressor.

  Patent Document 1 describes the structure of a compression section using a lip ring in a reciprocating compressor having one compression section in one lens pot.

  In Patent Document 2, the lower surface of the base portion of the lip ring is in contact with the upper surface of the piston body from the portion that intersects at least the inner end portion of the curved surface of the inner corner portion where both inner surfaces of the base portion and the lip portion contact each other to the cylinder side. There is a facing description.

  Patent Document 3 describes a piston in which a low-pressure side and a high-pressure side compression portion are integrally molded.

JP 2008-297924 A JP 2013-253699 A US Patent Application Publication No. 2005/0238513

  Up to now, high pressure, small size and light weight have been promoted in order to improve workability and reduce work load in compressors. Although the market pressure has been satisfied at the highest pressure, there is a need to improve workability by further reducing the size and weight. In order to meet the needs for further miniaturization and weight reduction, a structure that uses two lancetsbows to perform two-stage compression in the past, a structure that has two compression parts in one lancetsubo and performs two-stage compression It was investigated. Originally, a ring that performs compression to prevent contact between the piston and cylinder ideally stops compression when the limit wear is reached and pressure does not increase. However, in this structure in which one compression rod has two compression parts, even if the ring provided in the compression part on one side reaches the limit wear and does not perform compression, the other ring continues to compress. The ring that has reached the limit wear is continuously affected by the compressive load. Therefore, there has been a problem that the ring that has reached the limit wear further performs frictional motion with the cylinder, and the compression portion such as a piston comes into contact with the cylinder.

    In the present invention, the low pressure side piston that reciprocates in the low pressure side cylinder and the high pressure side piston that reciprocates in the high pressure side cylinder are integrally formed, and the integrated piston is reciprocated via the small end. A connecting rod to be moved, and both the low-pressure side piston and the high-pressure side piston of the integral piston are provided with a lip ring that seals against the cylinder.

  According to the present invention, the compressor can be reduced in size and weight, and reliability can be ensured even when one of the rings reaches the limit wear.

Sectional drawing of the compressor main body of Example 1 which concerns on this invention The top view of the compressor main body of Example 1 which concerns on this invention The top view of the tank integrated air compressor of Example 1 which concerns on this invention Conventional piston compression unit Conventional piston compression unit FIG. 1 is a front view and a sectional view of an integrated piston according to a first embodiment of the present invention. Example 1 A lip ring fixing part according to the present invention The lip ring of Example 1 which concerns on this invention The figure which shows the damage of the lip ring in Example 1 which concerns on this invention Integrated piston front view and sectional view of Example 2 according to the present invention

  Hereinafter, a compressor main body structure of a compressor according to each embodiment of the present invention will be described in detail with reference to the drawings.

  First, the compressor main body structure and the operation of the compressor according to the first embodiment of the present invention will be described with reference to FIGS.

  In FIG. 1, reference numeral 1 denotes a compressor body that compresses air or the like. The compressor body 1 includes a crankcase 2 and cylinders 3 and 4 attached to the crankcase 2. A crank jig 6 that rotates by the operation of the motor 5 passes through the crankcase 2. A stator 7 and a main bearing 8 are directly fixed to one end side of the crankcase 2. Further, the side opposite to the attachment side of the stator 7 has a structure in which a side wall 9 with a main bearing 8 is fitted.

  The crank jig 6 penetrating the crankcase 2 is formed of a casting, and a balance for reducing vibration generated by the operation of the compressor body 1 is integrated. A crank rod (connecting rod) 11 fitted with a bearing 10 is inserted into the crank jig 6, and the crank jig 6 is supported from both ends by two main bearings 8 fitted to the crankcase 2 and the flange 9. The rotation axis center of the crank jig 6 in the bearing 10 mounting portion is designed to be different from the rotation axis center of the main bearing 8, and the rotation of the crank jig 6 due to the operation of the motor 5 causes the lens rod 11 to perform an eccentric motion. In the eccentric movement of the lancet bow, a structure using the crank jig 6 shown in the present embodiment may be used, or a structure using an eccentric part of another member may be used.

  A motor 5 drives the compressor body 1. The motor 5 includes a stator 7 and a rotor 12, and the rotor 12 is attached to the crank jig 6 via a key 13. The rotor 12 is fixed in the axial direction by a fan shaft 14 and a washer 15 for fixing the cooling fan 13.

  Reference numeral 13 denotes a cooling fan for cooling components of the air compressor such as the stator 7, the cylinders 3 and 4, and the cylinder heads 16 and 17. The cooling fan 13 is rotated by driving the motor 5 to cool each part.

  3 is a high-pressure side cylinder attached to the crankcase 2, and 4 is a low-pressure side cylinder attached to the crankcase 2. In this embodiment, the compressor body 1 is provided with two cylinders 3 and 4 of high pressure and low pressure, and the pair of cylinders 3 and 4 are attached so as to face each other with the crankcase 2 interposed therebetween. The crankcase 2 is provided with flanges 18 and 19, and cylinders 3 and 4, cylinder packings 20 and 21, kuukiben 22 and 23, head packings 24 and 25, and cylinder heads 16 and 17 are arranged to be stacked on the flanges 18 and 19. And the compression chambers 30 and 31 are formed by fixing with the through bolts 28 and 29 shown in FIG.

  32 is a piston provided with lip rings 33 and 34 for compressing air or the like. The piston 32 is fixed to the lens set 11 through a bearing 35 and a piston pin 36. Retainers 37 and 38 are fixed to both ends of the piston 32 so that the lip rings 33 and 34 are sandwiched by the tread screws 39 and 40. In this structure using the piston 32 in which the low pressure side compression part and the high pressure side compression part are integrated, the process (stroke) at the time of the compression process is the same for both low pressure and high pressure. By molding the outer diameters with different dimensions, a two-stage compression is performed by producing a process volume difference between a low pressure and a high pressure.

  Next, operation | movement of the compressor main body 1 in a present Example is demonstrated. In the compressor main body 1 in this embodiment, when the crank shaft 6 is rotated by driving the rotor 12, the piston 32 provided with the lip rings 33 and 34 reciprocates in the compression chambers 30 and 31 by the eccentric movement of the lens rod.

  In the suction process in which the lip ring 34 that performs the first-stage compression moves from the top dead center to the bottom dead center, the air is sucked into the compression chamber 31 through the crankcase 2 and the cylinder 4, and conversely the lip ring 34 heads to the top dead center. In the discharge process, the sucked air is compressed to about 0.7 MPa and discharged through the KUKUBEEN 23 and the cylinder head 17. The discharged compressed air is sent to the cylinder head 16 on the high pressure side through the pipe 43 shown in FIG. In the second stage compression, as in the first stage compression, the compressed air sent to the cylinder head 16 is compressed through the kuukiben 22 in the suction process of the lip ring 33 from the top dead center to the bottom dead center. It is sucked into the chamber 30 and compressed to 4.0 MPa or more in the discharge process from the bottom dead center to the top dead center. Here, the compressed air compressed to 4.0 MPa or more is sent to the air tank 45 through the kuukiben 22, the cylinder head 16, and the pipe 44 shown in FIG. The stored compressed air is taken out via the pressure reducing valve 46 and the air outlet 47 and used depending on the application. The above is the details about the operation of the compressor.

  In realizing the present embodiment, a problem that has not occurred in a structure in which one conventional lancet bow has one compression section will be described. In the conventional structure having one compression portion for one lotus bow shown in FIG. 4, a piston-type compression portion having a small end bearing is generally known. The piston-type compression section includes a piston ring 49 and a piston 51 that holds a rider ring 50 fixed to a lens set 54 through a piston pin 52 and a small end bearing 53. The large end bearing 55 of the lens set bow 54 has the crankshaft and By using an eccentric mechanism such as an eccentric member 56, the cylinder reciprocates. In the compression movement, as shown in FIG. 5, the piston load 57 at the time of compression is applied to the upper surface of the piston, but depending on the swing angle determined by the specifications of the small end bearing 53, the process amount (stroke), etc. It is a well-known fact that a side pressure 58 is generated as a component force of the load 57.

  On the other hand, in this structure having two compression parts with respect to one lancet bow of this embodiment, even if one compression ring reaches the limit wear, the other ring continues to compress, so the piston load The side pressure, which is a component force, continues to be received by the ring on the side where the limit wear has been reached, and in the worst case, there is a problem that the piston and cylinder formed of metal contact each other. If the piston and cylinder come into contact, not only will the parts need to be changed significantly during recovery, but other parts may be damaged.

  Next, the form of the present embodiment will be described. As shown in FIG. 6, in this embodiment, in a structure in which low pressure and high pressure pistons are integrated and two-stage compression is performed with one single lens set 73, lip rings 59 and 60 are provided at both ends of the piston 61, respectively. It is fixed. As shown in FIG. 7, the end portion 65 at the outer corner where the outer surfaces of the base portion 63 and the lip portion 64 of the lip rings 59 and 60 are in contact is the lip ring of the piston 61 where the base portion 63 of the lip ring is in contact. The configuration is such that it is located closer to the cylinder 66 than the outer diameter of the support surface 42.

  FIG. 8 shows a lip ring. The lip ring includes a base portion 63 and a lip portion 64 that are fixed to the piston. By mounting such an integrated piston, it is possible to reduce the number of lancet bows that have conventionally been used by two, thereby reducing parts such as lancet bows and large end bearings and reducing the weight. In addition, the axial dimension of the compressor can be shortened by the amount of the single lotus bow, and the compressor body can be downsized. Further, shortening the axial dimension of the compressor leads to a reduction in the distance between the main bearings, so that the stress generated in the crank jig by the force received by the crank jig from the lancet bow during the operation of the air compressor can be reduced. . Thereby, since the shaft diameter of a crank jig can be designed thinner than before, the weight of the compressor body can be reduced.

  As another effect, the integral piston 61 is provided with lip rings 59 and 60 at both ends, and the end portion 65 of the outer corner portion where the outer surfaces of the base portion 63 and the lip portion 64 of the lip ring are in contact with the lip ring. By adopting a configuration in which the base portion 63 is in contact with the cylinder 66 with respect to the outermost diameter of the lip ring support surface 42 of the piston 61, one of the compression rings (for example, 59) reaches the limit wear. However, when the other ring (for example, 60) continues to be compressed, the piston 61 and the cylinder 66 are prevented from contacting when the ring (for example, 59) that has reached the limit wear continues to receive the side pressure. be able to. This is because the lip ring failure mode occurs in the order of lip portion 64 failure and base portion 63 failure, so that even if the lip portion 64 is completely dropped as shown in FIG. Because. If the operation is continued even if the lip portion 64 of one lip ring (for example, 59) is damaged, the wear of the base portion 63 is accelerated, and eventually the piston 61 and the cylinder 66 come into contact with each other. However, if the compression is continued so that the lip portion 64 of one lip ring (for example 59) falls off, the air filling time in the air tank is extremely delayed, so that the user can notice abnormally. As a result, it is possible to eliminate the rider ring that has been installed to prevent contact between the cylinder and the piston and to receive side pressure, and to improve the assemblability and reduce the cost.

  Another advantage is that the low pressure and high pressure are integrally molded with a piston 61 at both ends, and the lip ring is fixed to the retainer 72, so that the piston 61 and the cylinder can be easily centered. Can be done. If the piston ring is used for the compression ring, the piston ring needs to form the cylinder and the sealing surface with back pressure, so the piston ring becomes loose with respect to the piston, and the jig is used to center the cylinder and piston. Or a guide ring such as a rider ring must be used. On the other hand, since the lip ring is fixed to the piston 61 by the retainer 72, when assembling the cylinder, the cylinder can be assembled following the outer diameter of the lip ring, so that the assembly can be simplified. .

Next, a compressor main body structure according to a second embodiment of the present invention will be described below with reference to FIG.
The present embodiment is characterized in that a guide ring 68, 69 serving as a guide for a cylinder is provided below the lip ring in a piston 67 configured integrally with low pressure and high pressure as compared with the first embodiment. The guide ring may be provided only on one side of the low pressure side or on the high pressure side, or on both sides. In addition, the number of guide rings may be one or plural.

  In the first embodiment, the side pressure due to the piston load is received only by the lip ring. However, in the second embodiment, since the guide rings 68 and 69 can also receive the side pressure, the compression rings 70 and 71 on either the low pressure side or the high pressure side are provided. When the limit wear is reached and the compression movement is continued, the possibility of contact between the piston and the cylinder can be further reduced.

DESCRIPTION OF SYMBOLS 1 Compressor body 2 Crankcase 3, 4 Cylinder 5 Motor 6 Crank jig 7 Stator 8 Main bearing 9 Dikebaco 10 Bearing 11 Rensetubo 12 Rotor 13 Cooling fan 16, 17 Cylinder head 18, 19 Flange 22, 23 Through bolt 28, 29 Through bolt 30 , 31 Compression chamber 32 Piston 33, 34 Lip ring 35 Bearing 36 Piston pin 37, 38 Retainer 45 Air tank 46 Pressure reducing valve 51 Piston 57 Piston load 58 Side pressure 59, 60 Lip ring 63 Base portion 64 Lip portion 68, 69 Guide ring 73 Rensetsubo

Claims (7)

In a compressor that has a low pressure side compression section and a high pressure side compression section and performs two-stage compression,
A low pressure cylinder,
A high pressure side cylinder,
An integrated piston in which a low pressure side piston that reciprocates in the low pressure side cylinder and a high pressure side piston that reciprocates in the high pressure side cylinder; and
A connecting rod for reciprocating the integral piston through a small end,
A compressor characterized in that both of the low-pressure side piston and the high-pressure side piston in the integral piston are provided with a lip ring that seals against the cylinder.   The end portion of the outer corner where the base portion of the lip ring contacts the lip portion is located on the cylinder side with respect to the outer diameter of the lip ring support surface of the piston with which the base portion of the lip ring is in contact. The compressor according to claim 1.   2. The compressor according to claim 1, wherein the integrated piston receives a side pressure from the cylinder only by the lip ring without using a rider ring.   The compressor according to claim 1, wherein the integral piston includes a guide ring in addition to the lip ring.   2. The compressor according to claim 1, wherein even when the lip ring reaches a limit wear, a side pressure can be further received by the lip ring. 3.   The compressor according to claim 1, wherein the integral piston swings in a reciprocating motion by an eccentric mechanism used in the connecting rod.   The compressor according to claim 6, wherein a crank jig is inserted into the connecting rod, and the crank jig is rotated by operation of a motor.

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