JP2001165062A - Lubricating method of gear pump bearing part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problems in a conventional inconvenient and uneconomical method that two kinds of pumps different in lubricating methods are prepared to use them corresponding to the property of resin materials, and provided a lubricating method for a bearing part of a gear pump, capable of executing the both methods by one pump. SOLUTION: In this lubricating method of a bearing part rotatably supporting a shaft provided with plural gears of gear pump having a suction port and a discharge port, and rotating plural gears engaged with each other for discharging a resin material, an external leak method for discharging a resin material used in the lubrication of the bearing part to the outside of the pump, and an internal leak method for returning the resin material to the suction port side in the pump are switchably applied.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gear pump for discharging a resin material, and more particularly, to a method of lubricating a bearing for rotatably supporting a shaft on which a gear is mounted.

[0002]

2. Description of the Related Art When lubricating a bearing portion supporting a shaft on which a gear of a gear pump for discharging a resin material is mounted with lubricating oil or the like, lubricating oil or the like may be mixed into the discharged resin material.
Usually, it is performed by the resin material itself. As the lubrication method, there are an external leak method in which the resin material used for lubricating the bearing portion is discharged out of the pump, and an internal leak method in which the resin material is returned to the suction port side in the pump.

[0003] In the former case, it is necessary to treat the resin material discharged outside the machine body. In other words, the discharged resin material is oxidized and degraded and cannot be recycled, so it has to be disposed of. This is extremely troublesome, but has the advantage that the discharged resin does not burn into the discharge resin inside the machine. There is. On the other hand, in the latter, the resin material used for lubricating the bearing portion is returned to the resin material to be discharged again, so that the resin deteriorated due to the burn may be mixed in, and the quality of the product may be deteriorated. Are effective, and both of them have been used as resin materials capable of fully exhibiting advantages.

[0004]

However, the conventional lubrication methods for the gear pump bearings are only for the external leak type and the internal leak type, respectively, and one pump cannot use both types. Was very inconvenient and uneconomical because two types of pumps having different lubrication systems were prepared, and both types had to be used depending on the properties of the resin material.

An object of the present invention is to provide two types of pumps having different lubrication systems as in the prior art, and to use both of them according to the properties of the resin material, which is inconvenient and uneconomical. An object of the present invention is to provide a method of lubricating a bearing portion of a gear pump in which one type can be used for both types.

[0000]

According to the present invention, there is provided a gear pump having a suction port and a discharge port, wherein a plurality of gears mesh with each other and rotate to discharge a resin material. In the method of lubricating a bearing part that rotatably supports a shaft with a gear attached, an external leak method that discharges a resin material used for lubricating the bearing part out of the pump and an inside that returns the resin material to a suction port side in the pump A method of lubricating a gear pump bearing portion characterized in that the leak method can be switched.

As a result, since one gear pump is used for both types, it is possible to switch over each time depending on the properties of the resin material.

The external leak method and the internal leak method are preferable because the optimum operating conditions are selected if the amounts of the resin material discharged to the outside and the resin material returned to the suction port side in the pump can be changed.

Further, if the return port of the return resin material in the internal leak system is opened to the enlarged portion on the gear pump suction port side, if the inlet of the gear pump suction port is narrowed as described above, the vicinity of the gear is enlarged. Because the resin material introduced from the suction port moves from the narrow entrance to the enlarged part,
The return resin material in the internal leak method easily returns to the resin material introduced from the suction port.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS. Gear pump 1 is casing 2
A gear 7 and a gear 8 respectively mounted on shafts 5 and 6 rotatably supported by bushings 3 and 4 are inserted therein. Side plates 9 and 10 are attached to both ends of the casing 2 to seal the inside of the casing 2 and have an inlet 11 and an outlet 12 in which the inlet and outlet are narrow and the vicinity of the rear gear is enlarged. From the suction port 11 as indicated by the arrow a.
Introduced into the gear pump 1 controlled to a predetermined temperature,
The pressure is discharged from the discharge port 12 and discharged.

Resin reservoirs 14 and 15 and resin reservoirs 16 and 17 are provided on the inner surfaces of the side plates 9 and 10 on the inner surface of the casing side opposite to the end surfaces of the shafts 5 and 6, respectively, and the gears 7 and 8 are mounted thereon. Resin materials which have lubricated the inner diameter surfaces of the bushings 3 and 4 which rotatably support the shafts 5 and 6 and the coaxial shaft 5 and the shaft 6 are stored therein. As shown in FIGS. External leakage is performed from leak holes 18 and 19 communicating with 16 and 17 or resin reservoirs 14 and 15 and resin reservoirs 16 and 1
The internal resin leaks from the return holes 20 and 21 provided in the casing 2 communicating with the nozzle 7 and is returned to the resin material introduced into the gear pump on the suction port 11 side.

Adjustment plugs 22 and 23 are provided in the leak holes 18 and 19 so that the amount of the external leak resin can be adjusted from outside the machine body. Also, the side plates 9, 1
The resin reservoirs 14 and 15 and the resin reservoirs 16 and 17 provided on the inner surface of the casing 2 are communicated with each other by grooves 24 and 25, respectively (the resin reservoirs 16 and 17 are not shown). Return holes 20 and 2
1 is provided.

The intersection b of the grooves 24 and 25 of the side plates 9 and 10
Are provided with adjusting valves 26 and 27. The valves 26 and 27 are pushed and pulled by screws or the like from outside the fuselage to return holes 2 and 27.
The amount of resin for internal leakage can be adjusted by changing the cross-sectional area of 0 and 21 and the length of the flow path.

As shown in FIG. 5, bushes 3 and 4
A groove 28 is provided on the inner diameter surface of the member, and a groove 29 is provided on an end surface facing the side plates 9 and 10. The lubricating resin material is supplied between the bushes 3 and 4 and the shafts 5 and 6, and To reservoirs 16 and 17, or return holes 20 and 21
And the outlets 30 and 31 of the return holes 20 and 21 are opened to an enlarged portion in the suction port 11,
As the introduced resin material moves from the narrow entrance to the enlarged portion, the pressure rise due to the amount of the returned resin is reduced, and the returned resin material from the return holes 20 and 21 is easily returned to the introduced resin material.

Because of the structure described above, both plugs are used from the outside of the machine using the adjusting plugs 22 and 23 for the external leak system and the adjusting valves 26 and 27 for the internal leak system depending on the nature of the resin material. Among these, the flow of the resin of an unnecessary type can be stopped (the flow rate is set to 0).

[0016]

As described above, according to the present invention, 1
The external leak system and the internal leak system can be shared by two gear pumps, and the drawbacks that were initially fried can be eliminated.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a gear pump according to an embodiment of the present invention, as viewed from a side.

FIG. 2 is a cross-sectional view of the gear pump according to the embodiment of the present invention, as viewed from the front, and is a cross-sectional view taken along line AA of FIG.

FIG. 3 is a view of a side plate on a casing side showing an embodiment of the present invention, and is a cross-sectional view taken along line BB of FIG. 2;

FIG. 4 is a cross-sectional plan view of the gear pump showing one embodiment of the present invention, and is a cross-sectional view taken along line CC of FIG. 2;

5A is a cross-sectional view of a bush showing one embodiment of the present invention, FIG. 5B is a side view of the bush showing one embodiment of the present invention, and is a view taken in the direction of the arrow Z in FIG. .

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 gear pump 2 casing 3, 4 bush 5, 6 shaft 7, 8 gear 9, 10 side plate 11 suction port 12 discharge port 13 heater 14, 15, 16, 17 resin reservoir 18, 19 leak hole 20, 21 return for leak Holes 22, 23 Adjustment plugs 24, 25, 28, 29 Grooves 26, 27 Adjustment valves 30, 31 Return hole outlet

Claims (3)

[Claims] 1. A gear pump having a suction port and a discharge port, in which a plurality of gears are engaged with each other and rotated to rotatably support a shaft on which the plurality of gears of a gear pump for discharging and boosting a resin material are mounted. In the method of lubricating the bearing part, it is possible to switch between an external leak method in which the resin material used for lubricating the bearing part is discharged out of the pump and an internal leak method in which the resin material is returned to the suction port side in the pump. Method of lubricating the gear pump bearing part. 2. The gear pump according to claim 1, wherein the external leak system and the internal leak system are capable of adjusting the amounts of the resin material discharged to the outside and the resin material returned to the suction port side in the pump, respectively. Bearing lubrication method. 3. The lubrication method for a gear pump bearing according to claim 1, wherein the return port of the return resin material in the internal leak type is open to the gear pump suction port side.