JPS6242127Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a plunger pump having a reciprocating sleeve-shaped suction valve member. It performs reliable pump function from low speed to high speed, and reduces the fitting accuracy of the plunger and sleeve-shaped suction valve member.
This aims to reduce costs, prevent foreign matter from entering the sliding parts, and increase durability.

This idea consists of a plunger that reciprocates inside a housing with a water intake port formed on its side, a holding member fitted with a sealing material to keep the outer wall of the plunger airtight, and an axial center that follows the reciprocating movement of the plunger. a sleeve-shaped suction valve member that is fitted to be able to reciprocate in the direction of the housing and opens and closes a port provided on the end side of the housing; and a spring that urges the
A plunger pump is provided in which a plurality of labyrinth packings are provided on the inner wall surface of the tip end of a sleeve-shaped suction valve member, and an annular groove for collecting foreign matter is further formed at the tip end.

Next, this invention will be explained in more detail with reference to embodiments shown in the drawings.

FIG. 1 shows the main parts of an example of a plunger pump according to this invention. A driving part is provided at the base of the housing 1, and a crankshaft (not shown) is rotated in this driving part to drive the housing 1. A holding member 13 is provided between the housing 1 and the plunger 2 to allow the plunger 2 to reciprocate in an air-water tight manner.
The sealing material 3, impregnated felt 4, etc. fitted in the sealing material 3, impregnated felt 4, etc. are used to maintain air-water tightness as in the conventional case.

In this invention, on the outer periphery of such a plunger 2,
The sleeve-shaped suction valve member 6 reciprocates as a result of frictional contact therewith, and reciprocates slightly compared to the reciprocating movement of the plunger 2 due to the repulsive force of the spring 5 whose one end is locked to the holding member 13. It was established. Therefore, when the plunger 2 moves in the direction of the arrow F in FIG. Seat member B
When the plunger 2 is moved fully to the left in the figure, the sleeve-shaped suction valve member 6 in front of the plunger 2 closes the port 7 formed in the valve seat member B.
The liquid sucked into the interior is pushed out, the discharge valve is opened, and the liquid in the port 7 is discharged from the discharge port 9.

Next, as shown in FIG. 2, when the plunger 2 moves in the direction of arrow F' in this figure, the sleeve-shaped valve member 6 also moves to the right in the figure due to friction with the plunger 2.
It is braked by the repulsive force of the spring 5, and its movement is smaller than the movement of the plunger 2, so the port 7 is opened and liquid is sucked into the sleeve-shaped suction valve member 6 in front of the tip of the plunger 2. When the plunger 2 reciprocates left and right as in the conventional case,
The sleeve-shaped suction valve member 6 acts as a suction valve by limited reciprocating motion to open and close the port 7, and performs a pumping action between it and the discharge valve 10. 1
Reference numeral 1 denotes a plurality of labyrinth packings provided on the inner wall surface of the tip of the sleeve-shaped suction valve member 6,
Furthermore, an annular groove 12 for collecting foreign matter is formed at its tip. If foreign matter is inhaled, the annular groove 12
A step is provided between the front end of the sleeve-like suction valve member 6, and when the plunger 2 moves in the right direction F', the sleeve-like suction valve member 6 moves against the spring 5.
When the pumped liquid from the opening 8 flows into the sleeve-shaped suction valve member 6, the flow velocity changes and foreign matter enters the annular groove 12. Since it is discharged from the discharge port 9 in the next discharge stroke, it is useful for labyrinth packing and protection of the plunger 2.

According to this idea, the following effects can be obtained.
That is, (1) the sleeve-shaped suction valve member 6 fitted and attached to the outer wall surface of the plunger 2 provided in the housing 1;
The reciprocating motion of the plunger causes the plunger to slide in the axial direction to open and close the port 7, ensuring reliable pumping function from low to high speeds.

(2) By forming the labyrinth packing 11 on the inner wall surface of the tip end of the sleeve-shaped suction valve member 6, it is possible to reduce the fitting precision between the plunger 2 and the sleeve-shaped suction valve member 6, and to reduce the cost. .

(3) By forming the labyrinth packing 11 to reduce wear on the plunger 2 and the sleeve-shaped suction valve member 6, and by making the annular groove 12 formed on the distal side of the labyrinth packing 11 into a foreign matter trapping groove, The durability of the labyrinth packing 11 is improved because dirt and other foreign substances mixed in the liquid become a reservoir, and the dirt is captured in the annular groove 12 and is not caught between the labyrinth packing 11 and the plunger 2. It becomes possible to increase the

[Brief explanation of the drawing]

FIG. 1 is an explanatory view showing an example of the essential parts of the plunger pump of this invention, and FIG. 2 is an explanatory view showing the plunger of the plunger pump of this invention in a retracted state. In the drawings, 1...housing, 2...plunger, 5...spring, 6...sleeve-shaped suction valve member, 7...port.

Claims (1)

[Scope of utility model registration request] A plunger 2 that reciprocates within a housing 1 having a water suction port 8 formed on its side surface, and a holding member 1 fitted with a sealing material 3 for keeping the outer wall surface of the plunger air-tight.
3 is fitted to the outer periphery of the plunger 2 so as to be able to reciprocate in the axial direction following the reciprocating motion of the plunger 2, and the housing 1
It has a sleeve-shaped suction valve member 6 that opens and closes the port 7 provided on the end side of the valve, and a spring 5 that has one end engaged with the holding member 13 and biases the sleeve-shaped suction valve member 6 toward the port 7 side. A plunger pump is provided with a plurality of labyrinth packings 11 on the inner wall surface of the tip end of the sleeve-shaped suction valve member 6, and further formed with an annular groove 12 for collecting foreign matter at the tip end.