JPS6245086Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a hydraulic pump used, for example, as a power source for a hot extrusion device.

An example of a conventional water pressure pump will be explained with reference to FIGS. 1 and 2. In FIG. 1, 1 is a first gear fixed to the motor shaft 2, 3 is a second gear meshed with the first gear, 4 is a crankshaft fixed to the second gear 3, and 5 is a first gear fixed to the motor shaft 2. A connecting rod 6 is eccentrically connected to the crankshaft 4, and a crosshead 6 is connected to the connecting rod 5. The crosshead 6 has two tie rods 7 and a head 8 connected to the end of each tie rod. A plunger 9 is provided which is fixed to the head. Reference numerals 10 and 11 are cooling water intake and discharge valves attached to the valve block 12, both of which use check valves (not shown). A pump chamber 13 is provided surrounding the valve block 12.

FIG. 2 is an enlarged view of part A in FIG.
9. A gland packing 17 and an upper bushing 18 formed by stacking a plurality of disc-shaped packings for sealing the bushing 16 and the pump chamber 13 are fitted, and the upper part is fixed with a packing presser 20. 21 is a cooling water reservoir formed on the upper part of the packing presser 20, and 22 is a water supply pipe.

Next, the operation will be explained.

Each gear 1 is driven by a motor (not shown).
3 rotates in the direction of the arrow, the crosshead 6 moves up and down via the connecting rod 5. Along with this, the lower end of the plunger 9 moves up and down within the pump chamber 13. When the plunger 9 starts moving upward in the pump chamber 13, the suction valve 1
0 is opened and cooling water is introduced into the pump chamber 13. Next, when the plunger 9 begins to move downward, the suction valve 10 is closed and the lower end of the plunger 9 descends to the lower surface of the pump chamber 13, thereby pressurizing the cooling water. At this time, the discharge valve 11 is closed. When this step is completed, the discharge valve 11 is opened, and the pressurized cooling water is sent under pressure to, for example, an accumulator (not shown). A water pressure pump repeats this type of operation.

Incidentally, in the gland packing 17, frictional heat is generated by the vertical movement of the plunger 9, and in order to prevent this frictional heat, cooling water is supplied from the cooling water supply pipe 22 to cool the plunger 9.
The pressure inside the pump chamber is high, and the upper bush 18
The gap between the plunger 9 and the plunger 9 is so small that almost no cooling water reaches the lower part of the plunger 9.
For this reason, the gland packing 17 wears out in a short period of time, requiring frequent replacement, and also takes a long time to replace.

The present invention aims to extend the life of the gland packing, and is characterized by the provision of a spiral groove for circulating cooling fluid on the reciprocating sliding surface of the bushing with the plunger.

Hereinafter, the device of the present invention will be explained in detail based on the drawings.

In the device of the present invention, the parts corresponding to FIG. 2 are improved as shown in FIG. A packing 17 and an upper bush 18 are fitted.

FIG. 4 shows an enlarged view of the cooling bush 23.
Reference numerals 4 and 25 indicate upper and lower horizontal grooves provided horizontally on the inner circumferential surface of the bush, and reference numeral 26 indicates a spiral groove provided in a spiral manner to communicate between the horizontal grooves. Also the third
In the figure, 27 is a cooling water introduction hole that penetrates from the outside of the cooling bush 23 to the lower horizontal groove 25;
8 is a discharge hole, 29 is a collection reservoir for collecting sludge generated due to wear of the gland packing, 30
14 is a hole provided in the packing holder 33, 31 is a discharge pipe, and 32 is a drainage collecting pipe.

With this configuration, as the hydraulic pump is used, the cooling water introduction hole 27 of the cooling bush 23
A cooling liquid is introduced into the lower horizontal groove 2.
5. The plunger 9 is sufficiently cooled by passing through the spiral groove 26 and the upper horizontal groove 24 and being collected from the discharge hole 28 into the drainage collecting pipe 32. The cooled parts of the plunger 13 descend one after another and come into contact with the gland packing 17, thereby cooling the gland packing. In this way, the gland packing 7 is cooled every time the plunger 9 moves up and down.

In addition, the cooling water provides cooling and lubricating effects between the gland packing 17 and the plunger 9, and these effects provide the gland packing 17 with a cooling and lubricating effect.
wear can be significantly reduced.

On the other hand, sludge discharge water is introduced from the introduction pipe 30 into the collection reservoir 29 through the hole 41 of the packing presser 33, and the sludge in the collection reservoir 29 is collected from the discharge pipe 31 into the collecting pipe 32.

As described above, the present invention improves the cooling of the plunger by providing a spiral groove in the bushing, and the frequency of replacing the bushings has been reduced to 1/10 of the conventional one.

[Brief explanation of the drawing]

Figure 1 is an overall view of the conventional system, Figure 2 is an enlarged view of part A in Figure 1, Figure 3 is an enlarged view of the part corresponding to Figure 2 of the present invention, and Figure 4 is an enlarged view of the bushing. be. 1...First gear, 2...Motor shaft, 3...
Second gear, 4...Crankshaft, 5...Connecting rod, 6...Crosshead, 7...Tie rod, 8...Head, 9...Plunger, 10
...Suction valve, 11...Discharge valve, 12...
Valve block, 13... Pump chamber, 14...
Hole, 15... Stuffing box, 16... Bush, 17... Grand packing, 18... Upper bushing, 19... Lower bushing, 20... Packing holder, 21... Water reservoir, 22... Water supply pipe,
23... Cooling bush, 24... Upper horizontal groove, 2
5... lower horizontal groove, 26... spiral groove, 27... introduction hole, 28... discharge hole, 29... collection reservoir, 30...
...Introduction pipe, 31...Discharge pipe, 32...Drain collecting pipe, 33...Packing holder.

Claims (1)

[Scope of utility model registration request] In a water pressure pump in which a plunger 9 reciprocates through a lower bushing 19, a gland packing 17, and an upper bushing 18 fitted in a stuffing box 15, a cooling bush 23 is provided with a spiral groove 26 for circulating cooling water on its inner surface. A water pressure pump characterized in that the plunger 9 is fitted adjacent to the gland packing 17.