JP3476586B2 - Belt guard set for belt driven reciprocating compressor - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the production of a full-cover type belt guard for safety of a belt drive type reciprocating compressor.

[0002]

2. Description of the Related Art A reciprocating compressor has a drive shaft provided with a flywheel pulley for reducing load fluctuations. To the flywheel pulley, a fan for cooling the heat of the compressor main body that rises due to the compression heat is sent to the compressor main body by making the arm portion of the flywheel into a blade shape. The flywheel pulley is driven by several V-belts from a motor pulley of a prime mover. For safety reasons, a belt cover is conventionally attached to these two rotating parts. However, the belt cover is the opposite side of the compressor body and the motor side and the cover of the outer periphery of the pulley and V belt,
The compressor itself and the motor side are in an open state, which does not provide a complete protective cover. In recent years, there has been an increasing need for a full-cover type belt guard because of the demand for higher machine safety.

FIG. 3 shows an example of a conventional belt cover. In the drawing, an outer frame 51 made of a U-shaped sheet metal
A metal mesh such as an expanded metal 52 is attached to one side of the above, and the one side open type belt cover 50 in which the opposite side of the compressor main body is in an open state. The mounting is carried out by attaching a plurality of stays 53 to an outer frame 51 made of sheet metal to the base of the compressor or the like so as to cover the two pulleys.

In addition, although there is a full-cover type belt cover, it is usually made of sheet metal, and a metal net is attached to the open surface of the belt cover 50. The full-cover type belt cover is made of sheet metal. Therefore, there are problems that it takes a lot of manufacturing man-hours and that removal of the belt during maintenance of the compressor is complicated and troublesome.

[0005]

SUMMARY OF THE INVENTION In the production of a full-cover type belt guard for covering two transmission pulleys and a belt of a belt drive type reciprocating compressor, a sheet metal product has a complicated shape.
There is a problem that the number of manufacturing and assembling steps is significantly increased and the cost is increased. Further, there is a problem in that removal of the belt during maintenance becomes complicated.

In consideration of the above-mentioned problems, the present invention is a device for manufacturing a belt guard set which is easy to manufacture and assemble and is easy to remove during maintenance by resin molding so as to reduce the mold cost required for resin molding. In addition to the above, it is an object of the present invention to obtain a full-cover type belt guard set which has been devised to enhance the cooling effect of the compressor main body, which was not taken into consideration in the conventional belt cover in resin molding.

[0007]

SUMMARY OF THE INVENTION The present invention relates to a belt guard set of a full cover type which surrounds a belt to be hung on a motor pulley and a flywheel pulley of a belt drive type reciprocating compressor, in which a belt guard fixing plate and a belt guard are respectively provided. A belt guard set that is divided into modules and is resin-molded, in which the cooling air holes opened in the belt guard fixing plate have a larger ventilation opening area than the intake holes opened in the belt guard, and the belt guard is It has a box shape with a depth that covers the belt grooves of both pulleys, and the box-shaped side plates are overlapped at the time of transportation etc. to reduce the volume,
It is a belt guard set of a reciprocating compressor that is formed in a tapered shape with an opening surface expanding.

In the belt guard set,
The belt guard set is characterized in that a guide wall that is as close as possible to the flywheel pulley is provided on the outer periphery of the cooling air hole opened in the belt guard fixing plate on the flywheel pulley side.

[0009]

The function and size of the reciprocating compressor differ depending on the output and the application, and the diameter of the flywheel pulley and the motor and the mounting interval differ. Therefore, the quantity of one model is very limited. When attempting to perform resin molding on a belt guard with a relatively large shape, which was conventionally done by sheet metal manufacturing, a large injection molding machine and its die manufacturing cost become enormous, and the number of reciprocating production per model is relatively small. Adaptation to the compressor was considered difficult due to the high cost. However, the need for a full-cover type belt guard increases, and the cost of manufacturing a full-cover type belt guard sheet metal becomes extremely high. Therefore, a manufacturing method by resin molding has been examined anew.

In resin molding, a belt guard having a large shape is divided into modules to reduce the shape.
Belt guard fixing plate (1, 1a) and belt guard (2,
2a), and further, the belt guard fixing plate and the belt guard are respectively (1), (1a) and (2),
It is divided into two parts in (2a) at the center, and (1), (1a) and (2), (2a) have the same shape. The size at the time of molding is halved, and the number is doubled. The effect of becoming. Then, at the time of assembly, the same shape (1),
One of (1a) and (2), (2a)
It is assembled symmetrically by changing the direction by 80 °.

The belt guard (2, 2a) is provided with an intake hole (3, 3a) for taking in cooling air to the pulley surface, and the belt guard fixing plate (1, 1a) facing the belt is provided with cooling air. The cooling air holes (4, 4a) for opening are opened. For safety, the intake holes and the cooling air holes are fine mesh holes that do not allow human fingers to enter. In both of the ventilation holes, the hole area of the cooling air holes (4, 4a) opened in the belt guard fixing plate is larger than the hole area of the intake holes (3, 3a), that is, the mesh is larger than the suction side, and cooling is performed. The wind resistance is minimized to enhance the cooling effect of the compressor body. No fan is attached to the motor pulley. Therefore, the cooling air holes (4a) and the ventilation holes for the cooling air such as the intake holes (3a) are not required on the motor side. It is arranged from.

Further, since the belt guard (2, 2a) formed in a box shape has a depth that covers the belt grooves of both pulleys, only the belt guard (2, 2a) at the time of maintenance of the reciprocating compressor is provided. By removing the belt, it is possible to change the belt easily. The box-shaped side plate has a tapered shape in which the opening surface expands, so that it can be combined and stacked at the time of shipping as a belt guard set part or when assembling the compressor. The space required for shipping is reduced and the volume for shipping is reduced.

A guide wall is provided on the outer periphery of the cooling air holes (4, 4a) of the belt guard fixing plate on the pulley side so that the cooling air generated by the flywheel pulley is It is provided in order to prevent the diffused air in 1a) from escaping to the outer periphery and guide the cooling air to the cooling air hole side. As a result, the cooling air can be sent in a concentrated manner compared to the conventional belt cover, so that the cooling effect can be further enhanced.

[0014]

Embodiments of the present invention will be specifically described with reference to the drawings. FIG. 1 is an exploded perspective view in which the belt guard fixing plates 1 and 1a of the belt guard set and the belt guards 2 and 2a are set on a transmission belt that is hung on both pulleys.
In the figure, the belt guard fixing plates 1 and 1a consist of two parts and are divided at the center. The 1 and 1a
Are molded in the same shape and in the same mold, and are turned 180 ° and connected symmetrically. The connection is fixed by bolts at the upper and lower connecting plates 8. Then, the belt guard fixing plates 1 and 1a are attached to the base or the like on which the compressor main body is loaded by several attaching stays 9. Reference numeral 6 denotes a flywheel pulley, and an arm portion of the flywheel pulley 6 is provided with a fan for generating cooling air. Reference numeral 7 is a motor pulley. The motor pulley 7 does not have a fan and therefore does not need a ventilation hole, but is open for molding in the same mold. The V belts 5 and 5a are hung on both pulleys 6 and 7. The number of V-belts may be one or three depending on the output of the compressor, and is not limited to two. The belt guards 2 and 2a are in the same state as the belt guard fixing plates 1 and 1a, which are divided at the center and resin-molded in the same mold and are symmetrically assembled. Belt guards 2, 2a assembled in a box shape
Has a depth corresponding to the width of a pulley for hanging two belts, and when the belt guards 2 and 2a are removed,
The belt is exposed over the entire circumference, making it easy to perform maintenance such as belt replacement. The belt guards 2 and 2a are attached to the belt guard fixing plates 1 and 1a with several bolts 10. The resin used for this belt guard set is not limited to this invention, but a resin such as polypropylene that is easy to mold and recyclable is used.

In the above basic structure, the intake hole 3 opened in the belt guard 2 has a diameter corresponding to the diameter of the fan of the flywheel pulley 6 and is formed in a mesh shape for safety so that human fingers cannot enter it. Has been done. The central portion is a groove for accommodating a nut (not shown) for fixing the pulley to the shaft. Also, belt guards 2, 2a
Has a side plate of a tapered shape that spreads toward the pulleys 6 and 7, and the belt guard 2,
2a can be superposed on each other. The cooling air hole 4 of the belt guard fixing plate is opened with a diameter corresponding to the diameter of the flywheel pulley 6 like the intake hole 3, but the ventilation hole area is larger than the ventilation area of the intake hole 3 by a mesh size. By increasing the height, it has a large area to reduce the resistance of the cooling air.

As described above, the intake holes 3a and the cooling air holes 4
Since a is attached to the motor pulley 7 side, there is no need for an air vent, but it is attached because of the molding relationship with the same mold. Therefore, the motor pulley 7 side may be a plate without an air vent, which limits the present invention. Not something to do. Further, although the belt guard fixing plates 1 and 1a are formed as flat plates in the drawing, they may be formed in a shallow box shape that does not hinder the maintenance of the V-belt, and are not limited to flat plates.

FIG. 2 is a half cross-sectional view taken along the center of the belt guard fixing plate 1. The cooling air holes 4 are opened with a diameter corresponding to the diameter of the fan of the flywheel pulley 6.
A guide wall 11 is provided on the outer periphery of the cooling air hole 4. The guide wall 11 is for preventing cooling air from escaping from the gap between the side surface of the V groove of the flywheel pulley 6 and the belt guard fixing plate 1. The height of the guide wall 11 is equal to that of the flywheel pulley 6. The height of the side part is as close as possible to the range where it does not touch. The cooling air generated by the fan due to the effect of the guide wall can effectively send the cooling air to the compressor body through the holes of the cooling air holes 4.

[0018]

As described above, in the belt guard set of the belt drive type reciprocating compressor, the belt guard set is divided into modules and resin-molded to reduce the unit cost of parts and the number of assembling steps. Manufacturing cost is reduced.

Further, the mesh of the cooling air holes of the belt guard fixing plate is made larger than the air intake holes of the belt guard, and a guide wall is provided on the outer periphery of the cooling air holes on the flywheel pulley side to provide the cooling air to the cooling air holes. By effectively guiding the compressor, the cooling effect of the compressor main body is further enhanced.

Further, by making the box-shaped belt guard side plates tapered so that they can be overlapped with each other, the working space at the time of assembling can be reduced and the volume at the time of carrying the parts can be reduced.

Further, since the belt guard (2, 2a) formed in a box shape has a depth that covers the belt grooves of both pulleys, only the belt guard (2, 2a) at the time of maintenance of the reciprocating compressor is provided. By removing the belt, it is possible to easily change the belt.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a method of attaching a belt guard set to a transmission belt according to the present invention.

FIG. 2 is a half cross-sectional view of the belt guard fixing plate of the present invention taken along the center line.

FIG. 3 is a perspective view showing a belt cover of a conventional example.

[Explanation of symbols]

1,1a Belt guard fixing plate 2,2a Belt guard 3,3a Intake hole 4,4a Cooling air holes 5,5a V belt 6 flywheel pulley 7 motor pulley 8 connection board 11 information wall

Claims (3)

(57) [Claims] 1. A belt guard fixing plate (1, 1a) for a full-cover type belt guard set which surrounds a belt (5) hung on a motor pulley (7) and a flywheel pulley (6) of a belt drive type reciprocating compressor. ) And the belt guard (2, 2a) are divided into modules and molded by resin, and the cooling air hole (4) opened in the belt guard fixing plate (1) is provided in the belt guard (2). A belt guard set for a reciprocating compressor that has a larger ventilation opening area than the open intake hole (3). 2. In a belt guard set in which a belt guard fixing plate (1, 1a) and a belt guard (2, 2a) are divided into modules and molded by resin, the belt guard (2, 2a) is replaced by a pulley (6, 6). 7) It has a box-like shape having a depth that covers the belt groove, and the box-like side plate is formed in a taper shape in which the opening surface is widened in order to reduce the volume by stacking it at the time of conveyance. A belt guard set for a reciprocating compressor according to claim 1. 3. A belt guard set in which a belt guard fixing plate (1, 1a) and a belt guard (2, 2a) are divided into modules and molded by resin, and a cooling air hole opened in the belt guard fixing plate (2). The belt guard set for a reciprocating compressor according to claim 1, wherein a guide wall is provided on the outer periphery of the flywheel pulley (6) side of (4), as close as possible to the flywheel pulley.