JP5098463B2 - air compressor - Google Patents

Description

  The present invention relates to a buffer structure for a piston that reduces the noise during operation by buffering an impact when a compression piston of an air compressor reciprocates in a cylinder.

  In general, an air compressor is provided with a compression cylinder that slidably accommodates a compression piston in a side portion of a crankcase, and a rotary shaft is rotatably provided in the crankcase, and a connecting rod is provided on the rotary shaft via a crank. The tip of the connecting rod is connected to a compression piston in the compression cylinder, and the air introduced into the compression cylinder is compressed by reciprocating the compression piston in the compression cylinder. When attaching the compression cylinder to the side of the crankcase, an opening is cut out in the side of the crankcase, and a part of the opening is opened to one end of the crankcase, and the periphery of the opening A mounting base is formed on the base plate. And the rotating shaft which provided the crank inside the crankcase is attached. At that time, the connecting rod is attached to the crank and inserted into the crankcase from the open end of the opening, and the compression piston attached to the end of the connecting rod is fixed to the mounting base in a state of being fitted in the compression cylinder. .

In this way, the connecting rod has a structure in which one end is attached to the rotating shaft in the crankcase and the other end is attached to the compression piston outside the crankcase, so a part of the opening is open to the end of the crankcase, The connecting rod must be incorporated into the opening from the open end. And the thick attachment seat is formed in the peripheral part of an opening part, and a compression cylinder is fixed to this attachment seat (refer patent document 1).
No. 3-7590

  However, in the structure in which a part of the opening is opened, the crankcase is easily deformed continuously in the direction in which the periphery of the mounting seat of the compression cylinder and the opened side are expanded in each compression process. Therefore, along with the deformation, the amount of deformation becomes vibration and causes noise. Further, the base of the mounting seat has a problem that stress may be concentrated due to this deformation, leading to breakage.

  This invention makes it the subject to provide the air compressor which can suppress the deformation | transformation of an opening part and can reduce a noise by eliminating the said trouble and strengthening the circumference of a mounting seat.

That is, according to the first aspect of the present invention, a rotating shaft is rotatably provided in a crankcase, a compression cylinder is disposed outside the crankcase, a connecting rod is connected to the rotating shaft, and the connecting rod is An air compressor that compresses air introduced into a compression cylinder by connecting a tip to a compression piston in the compression cylinder and reciprocating the compression piston in the compression cylinder. The opening of the opening is attached to the end of the crankcase and covered with a crankcase cap, and the mounting seat for the compression cylinder is formed at the edge of the opening. On the extension of the seat's crankcase open side, a joint for receiving the fixing bolt for fixing the above crankcase cap is integrally formed. As well as,
On the outside of the mounting seat, a reinforcing rib having ribs bent at both side ends is formed in parallel with the axis of the crankcase, and one end side of each rib provided at the both side ends is formed integrally with the mounting seat. The other end is formed integrally with the joint.

  The invention according to claim 2 is characterized in that, in claim 1, a large thin portion is formed in the center portion of the crankcase and a small thin portion is formed on the end side.

  According to the first aspect of the present invention, the opening for attaching the compressor is cut out at the side of the crankcase, the end surface side of the crankcase of the opening is opened, and the edge of the opening is opened. Since the mounting seat of the compression cylinder is formed, a reinforcing rib is formed outside the mounting seat, and the end portion on the open side of the crankcase is covered with a crankcase cap, the periphery of the opening is reinforced by the reinforcing rib, Further, since the crankcase cap that covers the end portion of the crankcase on the open side is fixed to the crankcase with a fixing bolt or the like, the open end of the opening portion is also difficult to be deformed by fixing the crankcase cap. Therefore, the periphery of the mounting seat is strengthened, thereby suppressing the deformation of the opening and reducing the noise.

  In addition, since a joint portion with the crankcase cap is provided on the extension of the mounting seat on the open side, and the fixing bolt of the crankcase cap is screwed to the joint portion, both ends of the mounting seat are connected to the crankcase cap. It will be closed directly by the fixing bolt. Therefore, even when an external force is applied to the crankcase, the deformation of the opening together with the mounting seat is sufficiently prevented.

  According to the invention which concerns on Claim 2, since the big thin part was formed in the center part of the crankcase and the small thin part was formed in the edge part side, the whole can be reduced in weight.

  The structure of the air compressor of the present invention will be described with reference to FIGS.

  The air compressor A according to the present invention is of a reciprocating type, and includes a motor case 2 that houses the electric motor 1, a crankcase 4 having a rotating shaft 3, and two compressors 5 and 6.

  A stator 7 of the electric motor 1 is disposed in the motor case 2. The stator 7 is composed of a stator coil or the like, and surrounds the rotor 9 from the outer peripheral side. The rotor 9 is made of a permanent magnet or the like and is provided integrally with the rotary shaft 3. The rotor 9 rotates the rotary shaft 3 by electromagnetic force acting between the stator 7 and the rotary shaft 3 is extended and arranged in the crankcase 4. The crankcase 4 is rotatably supported by ball bearings 11 provided at the end wall of the crankcase 4 on the motor 1 side and the center of the crankcase cap 8, respectively.

  One end of the rotating shaft 3 protrudes outside the motor case 2 and a cooling fan (not shown) is fixed. A cooling air intake guide plate 13 is formed between the electric motor 1 and the cooling fan, and the electric motor 1 is cooled by the cooling air sent by the rotation of the cooling fan.

  In the crankcase 4, two connecting rods 14, 15 are connected to the rotary shaft 3 via an eccentric disk 10, one connecting rod 14 is connected to the compression piston 16 of the primary compressor 5, and the other connecting rod 15 is It is connected to a compression piston 18 of the next compressor 6.

  The compression piston 16 of the primary compressor 5 is a rocking piston and is slidably accommodated in a cylindrical compression cylinder 17. The compression piston 18 of the secondary compressor 6 is a general piston and is slidably accommodated in a cylindrical compression cylinder 19. The atmosphere is introduced into the compression cylinder 17 of the primary compressor 5. That is, the air is introduced into the crankcase 4 through an intake hole formed in the crankcase cap 8 of the crankcase 4 and further introduced into the compression piston 16 of the primary compressor 5 with a check valve (not shown). To the compression cylinder 17. The compression cylinder 19 of the secondary compressor 6 is configured to be supplied with primary pressure air discharged from the primary compressor 5, and the compressed air compressed by the secondary compressor 6 is supplied to an external air tank (not shown). It is supplied and stored.

  In the above configuration, when the electric motor 1 operates, the rotating shaft 3 rotates, so that the rotation is converted into reciprocating motion by the connecting rod 14 of the primary compressor 5, and the compression piston 16 reciprocates in the compression cylinder 17. When the compression piston 16 moves backward in the intake process, the space in the compression cylinder 17 suddenly expands, so that the inside becomes negative pressure, the introduction hole is opened, and the air in the crankcase 4 is introduced into the compression cylinder 17. . When the compression piston 16 moves forward in the compression step, the space in the crankcase 4 suddenly expands, so that air is taken into the crankcase 4 and at the same time the space in the compression cylinder 17 contracts. Thus, the introduction hole is closed, and a discharge port (not shown) formed in the compression cylinder is opened to discharge compressed air. Thereby, the atmosphere sent into the compression cylinder 17 is compressed in the compression cylinder 17 and discharged as primary pressure air. The primary pressure air is supplied from the air outlet pipe shown in the figure to the compression cylinder 19 of the secondary compressor 6 via the air introduction pipe of the secondary compressor 6. The primary pressure air in the compression cylinder 19 is further compressed by the compression piston 18 that reciprocates in the same manner, discharged as secondary pressure air, boosted, supplied to the air tank, and stored.

  By the way, as shown in FIGS. 3A and 3B, an opening 20 for attaching the compressors 5 and 6 is formed in the side portion of the crankcase 4 by notches. The end face side of the crankcase 4 of the opening 20 is open, and the inside of the opening 20 faces the inside of the crankcase 4 and the outside faces the outside of the crankcase 4.

  An inner peripheral surface of the opening 20 is formed in a substantially circular shape, and a mounting seat 21 for the compression cylinders 17 and 19 is formed upright on an edge thereof. A screw hole 22 for a fixing bolt is formed on the end surface of the mounting seat 21. The end face side of the crankcase 4 of the mounting seat 21 is also opened.

  As shown in FIG. 1, a joint portion 23 for receiving a bolt is integrally formed on the open side extension of the mounting seat 21 on the open side. The end face of the joint portion 23 is formed to be flush with the end face of the crankcase 4.

  Next, the crankcase 4 is formed with reinforcing ribs 24 a formed outside the mounting seat 21. The reinforcing ribs 24 are formed in parallel with the axis of the crankcase 4 and are formed at substantially the same height as the mounting seat 21. The ribs at both ends of the reinforcing rib 24 are bent, one rib is formed integrally with the mounting seat 21, and the other rib is formed integrally with the joint portion 23.

  Next, when the compression cylinders 17 and 19 and the compression pistons 16 and 18 are installed in the crankcase 4, the connecting rod is inserted from the open end of the crankcase 4 into one opening 20 as indicated by the arrow in FIG. The compression piston 16 with 14 is pushed in. Then, the compression piston 16 is slidably fitted into the casing 25 including the compression cylinder 17 and the cylinder cap, and the casing 25 is disposed on the mounting seat 21 as shown in FIGS. Then, it is screwed and fixed to the screw hole 22 (see FIG. 3A) of the mounting seat 21. Further, the crankcase cap 8 is brought into contact with the open end of the crankcase 4, and the fixing bolt 12 of the crankcase cap 8 is screwed and fixed to the joint portion 23 of the mounting seat 21.

  The same applies to the case where the compression piston 18 and the compression cylinder 19 of the secondary compressor 6 are attached to the other opening.

  By the way, as shown in FIG. 1, a middle thin portion 27b is formed at the center of the crankcase 4, a large thin portion 27a is formed on the electric motor 1 side, and a small thin portion 27c is formed on the open end side. Yes. The thin portions 27a, 27b, and 27c are formed based on the amount of deformation of the crankcase 4 during operation, and the thin portion 27a is formed large in the portion on the electric motor 1 side where the amount of deformation is small. Yes.

  The crankcase cap 8 is formed with reinforcing ribs 28 in a radial manner, so that sufficient strength is ensured.

  According to the above configuration, the opening 20 for attaching the compressors 5, 6 is cut out at the side of the crankcase 4, the end surface side of the crankcase 4 of the opening 20 is opened, and the opening 20 A mounting seat 21 for the compression cylinders 17 and 19 is formed on the edge of the mounting cylinder 21, a reinforcing rib 24 is formed on the outside of the mounting seat 21, and an end on the open side of the crankcase 4 is covered with a crankcase cap 8. Therefore, the periphery of the opening 20 is reinforced by the reinforcing rib 24, and the crankcase cap 8 that covers the end of the crankcase 4 on the open side is fixed to the crankcase 4 with the fixing bolt 12 or the like. The open end is also hardly deformed by fixing the crankcase cap 8. Therefore, the periphery of the mounting seat 21 is strengthened, whereby the deformation of the opening 20 can be suppressed and noise can be reduced.

  In addition, a joint 23 with the crankcase cap 8 is provided on the extension of the mounting seat 21 on the open side, and the fixing bolt 12 of the crankcase cap 8 is screwed to the joint 23 so that the mounting seat 21 is opened. Both ends are directly closed by the crankcase cap 8 and its fixing bolt 12. Therefore, even if an external force is applied to the crankcase 4, the deformation of the opening 20 together with the mounting seat 21 is sufficiently prevented.

  Further, since the large thin portion 27a is formed in the center portion of the crankcase 4 and the small thin portions 27b and 27c are formed on the end side, the entire weight can be reduced.

The perspective view of the principal part of the air compressor concerning the present invention. Vertical sectional view of the air compressor (A) and (b) are the top view and front view of the state which removed the crankcase cap (A) and (b) are a plan view and a front view of a state in which a crankcase cap is attached.

A Air compressor 4 Crankcase 14, 15 Connecting rod 16, 18 Compression piston 17, 19 Compression cylinder 21 Mounting seat 24 Reinforcement rib

Claims (2)

A rotating shaft is rotatably provided in the crankcase, a compression cylinder is disposed outside the crankcase, a connecting rod is connected to the rotating shaft, and a tip of the connecting rod is connected to a compression piston in the compression cylinder. In an air compressor for compressing air introduced into a compression cylinder by reciprocating a compression piston in the compression cylinder,
An opening for attaching a compressor is formed in a side portion of the crankcase, and an end surface side of the opening of the crankcase is opened and covered with a crankcase cap, and the compression cylinder is provided at an edge of the opening. Forming the mounting seat
A joint for receiving a fixing bolt for fixing the crankcase cap is integrally formed on an extension of the mounting seat on the crankcase opening side, and
On the outside of the mounting seat, a reinforcing rib having ribs bent at both side ends is formed in parallel with the axis of the crankcase, and one end side of each rib provided at the both side ends is formed integrally with the mounting seat. And the other end side was formed integrally with the junction part, The air compressor characterized by the above-mentioned.   2. The air compressor according to claim 1, wherein a large thin portion is formed at a center portion of the crankcase and a small thin portion is formed at an end side.

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