JPS6346765Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a plunger pump used for injecting various liquids, such as cement milk and chemical solutions in grouting work, and for pumping other chemicals and granular materials.

Ceramic, which has recently attracted attention as a material for various mechanical parts, has also been applied to plunger pumps (see Japanese Patent Laid-Open No. 50-91004).

The object of the present invention is to provide a plunger pump in which the parts of the plunger head that are subject to significant wear are made of ceramic having various outstanding properties, and in which the plunger head can be replaced extremely easily. This is the purpose.

Next, an embodiment of the plunger pump of the present invention will be described below based on FIGS. 1 to 4.

That is, the plunger 1 of the present invention consists of a metal base 2 whose base end is pivotally connected to the crank arm of the applicable plunger pump, which will be described later, and a plunger head 3 that slides into contact with the cylinder of the plunger pump. By screwing the threaded portion 4 protruding from the distal end surface of the base 2 into the screw hole 5 formed at the proximal end of the plunger head 3, the base 2 and the plunger head 3 are coaxial with each other. are connected in a shape.

The plunger head 3 consists of a metal core 3a and a ceramic cylinder 3b, and further includes:
The core body 3a has a large-diameter connecting part 6 in which a hexagonal screw rotating part is formed on the outer periphery and the screw hole 5 corresponding to the threaded part 4 is formed, and a threaded part 7 protrudes from the distal end surface. and a small-diameter mounting shaft portion 8 are integrally molded coaxially. Further, the cylinder body 3b has a shaft portion 8 for attaching the core body 3a.
An annular elastic member 9 made of Teflon is formed on the threaded portion 7 which is formed to have an inner diameter substantially the same as the outer diameter of the cylinder body 3b, and which is inserted into the mounting shaft portion 8 to cover it. By screwing the cap nut 10 through the cylindrical body 3b, the cylindrical body 3b is fixed and the mounting shaft portion 8 is covered in a watertight manner. Reference numeral 11 in the figure indicates a presser concave portion formed on the side surface of the distal end of the base portion 2 to prevent rotation when the plunger head 3 is rotated.

Further, FIG. 4 shows a plunger pump to which the plunger 1 of the above embodiment is applied, and its operation will be described.
When gear 2 rotates, this rotation causes the meshing gear 1 to rotate.
3 and 14 to the crankshaft 15, which is connected to the crankshaft 15.
Eccentric wheel 16, eccentric wheel 1 integrally protruding from the surface of
The plunger 1 reciprocates through a ring 17 encircled by a bearing 6 and a crank arm 18 integrated with the ring 17, and in response to this reciprocation, the plunger head 3 at the tip of the plunger 1 The inside of the pump chamber 19 that exits is alternately brought into a negative pressure state and a pressurized state. Therefore, each valve spring 20,2
The corresponding valve seat bodies 22, 23 depending on the biasing elasticity of 1
A check valve 24 on the suction side and a check valve 25 on the discharge side that block the flow of liquid by blocking the valve springs 20 and 2
The pump chamber 1 is opened alternately against the biasing force of the pump chamber 1.
In the chamber 9 , suction of the chemical liquid or the like from the suction port 26 through the valve chamber 27 and extrusion of the chemical liquid or the like into the valve chamber 28 are alternately repeated, and the liquid is force-fed to the discharge port 29 .

In addition, 30 in the figure indicates a cylinder of the plunger 1, and a crank case 31 is connected to the base end of the cylinder, and a casing 32 is connected to the front end of the cylinder. 33
is a window hole opened on the upper surface of the middle part of the cylinder 30,
34 is a lid that can be opened and closed freely relative to the window hole 33; 35;
A through hole 36, 3 for discharging contaminants is formed in the lower surface of the cylinder 30 so as to face the window hole 33.
7 is a seal on the outer periphery of the plunger head 3 fitted into the annular recess of the cylinder 30, 38 is a retaining ring for fixing the seals 36 and 37, and 39 is a discharge port 29.
It is an air tank connected to the

As described in detail above, the plunger pump according to the present invention has a plunger head 3 that reciprocates within the cylinder 30 and a base 2 for connecting to the crank arm 18, which is provided with a base 2 projecting from the distal end surface of the base 2. By screwing the threaded portion 4 into a screw hole 5 formed at the base end of the plunger head 3, the two can be connected and separated coaxially. A presser recess 11 is formed to prevent rotation when the plunger head 3 is rotated, and the plunger head 3 is attached to the metal core 3a.
and a ceramic cylindrical body 3b, the metal core 3a has a hexagonal screw rotation part formed on its outer periphery, and a large-diameter connecting part 6 in which the screw hole 5 is formed, and It consists of a small-diameter mounting shaft part 8 integrally molded coaxially with the connecting part 6, and a threaded part 7 is formed on the distal end side of the mounting shaft part 8, and the ceramic cylinder body 3b has the metal core. The cap nut 10 is formed to have an inner diameter that is approximately the same as the outer diameter of the mounting shaft portion 8 of the body 3a, and the mounting shaft portion 8 is inserted through the threaded portion 7 of the mounting shaft portion 8. The retainer recess 11 and the mounting shaft 8 are configured to be screwed together via an annular elastic material 9 with a heat insulating air layer formed between the inner surface of the recess and the front end surface of the mounting shaft 8. A window hole 33 is provided in the upper surface of the intermediate portion of the cylinder 30 facing the screw rotating portion of the metal core 3a.
Since it is characterized by having the following features, it has the following unique effects.

Since the core body 3a can be formed from an inexpensive metal, the overall size of the plunger pump can be reduced.

The plunger 1 is not an integral part, but a plunger head 3 that is tightly fitted in a cylinder 30.
Since the base 2 for connecting to the crank arm 18 is formed separately, the plunger head 3
When the cylinder 3b deteriorates, only the plunger head 3 needs to be replaced with a new one.

The most distinctive and unique effect is that the pressing concave portion 11 and the screw rotating portion of the plunger 1 are connected to the window hole 3.
3, insert a tool such as a spanner through the window hole 33, fix the pressing recess 11 with the tool, turn the screw rotating part with the tool, and separate the plunger head 3 from the base. By removing the retainer ring 38, seal 36, and seal 37 and taking out the plunger head 3 from the window hole 33, it is possible to replace it with a new one.
2) Since there is no need to disassemble the plunger, the work of replacing the plunger has become much easier compared to plunger pumps equipped with plungers according to the prior art.

[Brief explanation of the drawing]

The drawings show an embodiment of the plunger pump according to the present invention; FIG. 1 is a vertical side view of the plunger, FIG. 2 is a sectional view taken along line A-A' in FIG. 1, and FIG. 3 is a left end view. The top view and FIG. 4 are longitudinal sectional side views showing the whole. Cylinder……30, plunger head……
3, Crank arm...18, Connection base...2,
Threaded part...4, Screw hole...5, Holder concave part...1
1. Metal core body...3a, Ceramic cylinder body...
3b, Large diameter connecting part... 6, Small diameter mounting shaft part...
8, Threaded portion...7, Cap nut...10, Annular elastic member...9, Window hole...33.

Claims (1)

[Scope of utility model registration request] A base 2 for connecting the plunger head 3 reciprocating within the cylinder 30 and the crank arm 18.
By screwing the screw portion 4 protruding from the distal end surface of the base 2 into the screw hole 5 formed at the base end of the plunger head 3, the two can be coaxially connected and separated. A presser concave portion 11 for preventing rotation when rotating the plunger head 3 is formed on the side surface of the distal end of the base portion 2, and the plunger head 3 is connected to a metal core body 3a and a ceramic cylinder body 3b. The metal core 3a has a hexagonal screw rotation part formed on its outer periphery, and a large diameter connecting part 6 in which the screw hole 5 is formed;
It consists of a small-diameter mounting shaft part 8 integrally molded coaxially with the connecting part 6, a threaded part 7 is formed on the distal end side of the mounting shaft part 8, and the ceramic cylindrical body 3b is made of metal. The cap nut 10 is formed to have an inner diameter that is approximately the same as the outer diameter of the mounting shaft portion 8 of the core body 3a, and the mounting shaft portion 8 is inserted through the threaded portion 7 of the mounting shaft portion 8. The presser recess 11 is configured to be screwed through an annular elastic material 9 with a heat insulating air layer formed between the inner surface of the recess 10 and the front end surface of the mounting shaft 8. and a plunger pump characterized in that a window hole 33 is formed in the upper surface of the intermediate portion of the cylinder 30 that faces the screw rotating portion of the metal core body 3a.