JPH0547452U - Engine driven compressor - Google Patents

Abstract

(57) [Summary] [Purpose] High efficiency of the compressor by realizing rapid heat dissipation of the amount of heat generated by the compressor from the member to the outside, opening of the generated heat quantity retention space, and forced cooling by a fan inside and outside the open space. Provided is an engine-driven compressor having an operable cooling means. A drive shaft of an engine is directly connected to one end of a main shaft penetrating the inside of the crankcase, and the other end is protruded from the crankcase to connect a fan 24 to the side of the crankcase facing the fan. A suction opening is provided so that cooling air introduced into the crankcase through the opening can be discharged to the engine mounting side, and a piston and a cylinder that reciprocate by the drive of the main shaft are symmetrically arranged at the same time. A compression type opposed compressor structure and an oil-free structure in which the piston or piston ring is formed of a self-lubricating resin material are used.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a compressor which has a small and good cooling structure in which pistons are arranged on the left and right sides and are moved in opposition to each other to perform simultaneous compression, and which enables highly efficient operation, and particularly relates to an engine-driven compressor. .

[0002]

[Prior Art]

 BACKGROUND ART Conventionally, as shown in, for example, Japanese Patent Laid-Open No. 61-178575, a piston-opposed engine-driven compressor is known, which is configured to enable highly efficient operation by opposed movement of pistons. In this type of machine, it has been sought to operate the piston at high speed to improve the performance, and at the same time, reduce its size and preferably reduce its weight. The cylinder is made of aluminum to maintain a good heat dissipation effect in order to reduce its weight and to remove heat generated by piston movement. Therefore, in order to obtain a compressor that can operate at high speed and withstand highly efficient compression work for a long time, the generated heat is quickly and efficiently removed to ensure a good environment for the materials and structure used. However, in the conventional technology, the compression heat generated during operation in the cylinder is transmitted to the piston ring in the sliding part of the cylinder and the bearing attached to the connecting rod of the piston, which causes failure of seizure or malfunction. This will limit the operation to a range of low pressure and low rotation where it will not occur. As a structure that does not cause such an obstacle, there is a technique in which the operation of the prime mover is decelerated and the entire compressor is attached to the driven shaft of the compressor to send cold air by a cooling fan (Actual Publication No. Sho 49). 36243).

[0003]

[Problems to be solved by the device]

 However, the conventional cooling means by the attached fan for removing the generated heat quantity cannot efficiently cool the internal heat removal because it is closed to the outside such as the crankcase and the cylinder. To increase the cooling efficiency, the fan structure must be enlarged. Alternatively, when the fan rotation is increased, a vicious cycle is brought about, which results in increasing the compression heat. This increase in compression heat causes fatal phenomena such as the loss of grease in the grease-sealed bearing used for the internal structure, seizure in sliding parts, and play in the rotating eccentric disc. Therefore, it is difficult to simply secure the cooling performance. On the other hand, in recent years, there has been a wide demand for the development of a portable, non-power-supply type compressed air source device that uses a large amount of compressed air, is equipped with a lightweight, compact and small engine, and can be easily used. In order to solve the above-mentioned drawbacks and meet recent demands, a structure in which the amount of heat inside the compressor does not stay in a closed space, a structure that quickly removes the amount of heat generated, and a good heat transfer for the parts used It was necessary to solve problems such as improvement of members. In view of the drawbacks of the prior art, the object of the present invention is to solve the problem of rapid heat transfer / removal from the member of the generated heat amount, to achieve a reasonable structure of the generated heat amount space and the fan, and to meet the demand in recent years. It is an object of the present invention to provide a highly efficient engine-driven compressor that can comply.

[0004]

[Means for Solving the Problems]

 According to the present invention, the drive shaft 12 of the engine 11 is directly connected to one end of a main shaft 23 of the compressor 2 which penetrates the inside of the crankcase 21, and the other end is projected from the crankcase 21 so that a fan is provided at the projecting end. 24 is connected, and a suction opening 20 is provided on the side of the crankcase 21 facing the fan 24, and the cooling air F introduced into the crankcase 21 through the opening 20 is supplied to the engine mounting side. The engine-driven compressor is characterized by being provided with an exhaust port 26 at a main part of the crankcase 21 and having a cooling structure capable of discharging. Further, the engine-driven compressor having the above-described cooling structure has a simultaneous compression type opposed compressor structure in which a piston 29 and a cylinder 30 that reciprocate by the drive of the main shaft 23 are symmetrically arranged. is there. Further, the piston 29 and / or the piston ring 32, which forms a sealed space in which expansion and contraction are repeated with the cylinder 30, is constituted by an oil-free structure made of a self-lubricating resin material. As shown in FIG. 2, it may be preferable to set the opening by opening the mounting surface of the mounting bolt 22 for mounting the engine 1 and the crankcase 21.

Claims 1, 2, and 3 are illustrated in FIGS. 1 and 3, respectively.

[0006]

[Action]

 According to such a technical means, the heat generated in the driving part of the compressor 2 is partly generated by the piston 29 by the adoption of the self-circulating resin material having a heat insulating effect as compared with the piston made of aluminum and the piston ring made of cast iron. The heat transfer to the space on the main shaft 23 side is suppressed by the piston ring 32, and the rate at which the heat is trapped in the space is reduced, and as shown by the cooling air flow F in FIG. 1, the heat is transferred to the opening 20 of the crankcase 21. The transferred heat can be quickly removed by the fan 24. As a result, it is possible to reduce the structural size of the hermetically sealed portion of the compressor 2 which is required for heat dissipation or heat removal, and the forced ventilation effect of the fan 24 enables the internal ventilation of the cylinder 30. In addition, due to the effect of multiplication with the external cooling that is also performed, the rotation of the main shaft 23 can be sped up and the fan 24 can be operated at a high rotation speed, so that its blowing capacity is proportional to the rotation speed. Therefore, the cooling capacity is improved, and the improvement of the temperature environment of the compressor 2 thereby brings about the effect of realizing high-speed operation and weight reduction of the compressor 2 and long-term operation. It is possible to realize highly efficient miniaturization.

[0007]

【Example】

 Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative positions, etc. of the components described in this embodiment are not intended to limit the scope of the present invention to them, unless otherwise specified. It's just an example. FIG. 1 is an embodiment showing the basic configuration of the present invention, and is a cross-sectional view of the essential parts showing an outline of a compressor 2 and an embodiment of an engine driven compressor of the present invention. FIG. 3 is a sectional view taken along the line B-B ′ in FIG. 1, showing a main part of the crankcase 21. The engine part 1 is provided with a ventilation port 13 for the engine 11 through a hole 14, and a tip engaging part of a drive shaft 12 thereof is projected to the compressor 2 side. The crankcase 21 of the compressor 2 is fixedly connected to the engine portion 1 by a mounting bolt 22, and the opposite side thereof is formed into an opening 20 of the crankcase 21. Further, one end of the main shaft 23 is engaged with and fixed to the drive shaft 12 of the engine 11, and the main shaft 23 is provided at a substantially central position of the mounting surface of the crankcase 21 to be housed with the engine unit 1. It is rotatably fitted in a cantilever shape. Inside the cylinders 30 arranged on the left and right sides of the crankcase 21, one end of the connecting rod 33, which is reciprocally movable, that is, a small end portion 36, through an eccentric disk 38 disposed in the central portion of the main shaft 23, respectively. A piston ring 32, which is slidably disposed on the abutting surface thereof via a needle type bearing 37, is disposed at a tip end portion thereof, and a piston 29 for holding the piston ring 32 is attached. The eccentric disc 38 is rotatably connected to the connecting rod 33 via a large end 34 thereof and a ball type bearing 35. The other end of the main shaft 23 projects outward from the opening 20 of the crankcase 21 and a stopper 25 is screwed to the tip of the main shaft 23 so that the fan 24 can be attached thereto. The attached fan 24 is sized to allow external cooling of the crank case 21, and is fixed to the main shaft 23 by the stopper 25 so as to be drivable. The crankcase 21 is provided with an exhaust port 26 through which the cooling air from the fan 24 flows from the inside to the outside. The air exhaust port 26 can be used for mounting work of the crankcase 21 with the engine unit 1. 2 is a view showing the main part of the exhaust port 26 taken along the line AA ′ in FIG. 1, and as shown in the drawing, a part of the exhaust port 26 can pass through the engine unit 1 to It may be preferable to arrange the holes for the mounting bolts 22 side by side. The self-lubricating resin material used for the piston 29 and / or the piston ring 32 is preferably a heat insulating type. In addition, the arrangement of the compressor cylinders has a symmetrically opposed structure so that the engine exhaust heat does not directly hit the compressor cylinders. Also, the exhaust heat from the engine cooling was designed not to interfere with the exhaust heat after cooling the compressor.

A cooling effect was measured to confirm the effect of the engine-driven compressor of the present invention. Here, both the piston 29 and the piston ring 32 are made of a self-lubricating resin material. Table 1 shows temperature reduction effect data showing the results. This Table 1 shows that the bearing temperatures in the crankcase 21 and the small end 36 of the piston 29 part have dropped by 10 ° C. or more due to the presence or absence of the ventilation hole. It can be seen that the adverse effect of the hermetically sealed structure inside the crankcase 21 is completely removed, and the atmosphere is at room temperature. Further, it was found that the temperature effect in the bearing was 5.5 ° C. at the large end portion 34 of the connecting rod and 15.5 ° C. at the small end portion, showing that remarkable results were obtained. It is also shown that the effect of the small end bearing is due to the self-lubricating resin material.

[0009]

[Effect of the device]

 As described above, according to the present invention, the sliding effect is improved while ensuring the overall cooling effect of the improvement of the cooling structure of the compressor with respect to the constituent materials, the internal structure and the external structure. Prevents problems such as seizure in parts and rattling of the rotating eccentric disc, resulting in a shorter life of the compressor and, in turn, a high-speed drive, that is, a highly efficient engine drive. Type compressor can be provided. Only with the present invention, which has various advantages, it is possible to provide a portable compressor that is simple, lightweight, and has no power supply, and a simultaneous compression oil-free opposed compressor that enables rational operation. Has completed the engine drive format of, and its practical value is extremely large. Further, in the above-mentioned embodiment, the simultaneous compression oil-free opposed engine driven compressor having a novel cooling structure has been described in detail. Is also applicable.

[Brief description of drawings]

FIG. 1 shows an embodiment of an engine-driven compressor of the present invention,
FIG.

FIG. 2 is a view taken along the line AA ′ in FIG. 1 showing a main part of an exhaust port.

FIG. 3 is a BB ′ of FIG. 1, showing a main part of a crankcase.
It is an arrow view. (It is an explanatory view of prior art)

FIG. 4 is temperature reduction effect data showing effects of the engine-driven compressor of the present invention.

[Explanation of symbols]

 2 compressor 11 engine 12 drive shaft 20 opening 21 crankcase 23 main shaft 24 fan 29 piston 30 cylinder 32 piston ring

Claims (3)

[Scope of utility model registration request] 1. A main shaft 2 penetrating the inside of a crankcase 21.
The drive shaft 12 of the engine 11 is directly connected to one end of the crankshaft 3, the other end of the crankcase 21 is projected from the crankcase 21, and the fan 24 is connected to the projected end of the crankcase 21. The opening 20 is provided in the
The engine-driven compressor is characterized in that the cooling air introduced into the crankcase 21 from 0 can be discharged to the engine mounting side. 2. The engine-driven compressor according to claim 1, wherein the piston 29 and the cylinder 30 that reciprocate by the driving of the main shaft 23 are arranged symmetrically in the left and right directions so as to have a simultaneous compression type opposed compressor structure. 3. The engine-driven compressor according to claim 1, wherein the piston 29 and / or the piston ring 32 has an oil-free structure formed of a self-lubricating resin material.