JPH0341096Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a chemical pump that is attached as a sub-reciprocating pump to the tip of the main reciprocating pump and operates in conjunction with the main reciprocating pump.

[Conventional technology]

For example, Jitsugan No. 59-195394 (Jitsuhei 2-34473)
In the chemical pump disclosed in the above publication, a through hole communicating with the main pump chamber of the main reciprocating pump is formed at the tip of the main reciprocating pump, and a base end opening of the cylinder of the sub reciprocating pump is connected to the through hole. The auxiliary reciprocating pump is mated and communicated with the main pump chamber of the main reciprocating pump, with the resilient member biasing the sub-plunger of the sub-reciprocating pump toward the main plunger of the main reciprocating pump.

[Problem that the invention attempts to solve]

In such chemical pumps, as the time required for the sub-pump chamber to start suctioning liquid becomes long, the sub-plunger of the chemical pump and its Either a seal is required between the sliding surface and the sliding surface, or tolerances need to be reduced to eliminate gaps between the two.

The purpose of this invention is to provide a chemical pump that can shorten the time until the chemical pump starts sucking liquid, and that can reduce the degree of sealing on the outer periphery of the plunger of the chemical pump while maintaining the functions of the chemical pump. It is.

[Means to solve the problem]

According to this invention, the base end opening of the sub cylinder of the sub reciprocating pump is fitted into the through hole of the manifold that communicates with the main cylinder of the main reciprocating pump, and communicates with the main pump chamber of the main reciprocating pump, In a chemical pump in which an elastic member urges a sub-plunger of the sub-reciprocating pump toward a main plunger of the main reciprocating pump, the sub-plunger of the sub-reciprocating pump is provided with an elastic member of the main reciprocating pump and the sub-reciprocating pump A through hole is formed to communicate between the pump chambers.

[Effect]

Since the elastic member urges the sub plunger of the sub reciprocating pump toward the main plunger of the main reciprocating pump, the sub plunger of the sub reciprocating pump reciprocates in conjunction with the reciprocating movement of the main plunger of the main reciprocating pump.

Since the pump chambers of the main reciprocating pump and the sub-reciprocating pump communicate with each other through the through hole, the negative pressure generated in the main pump chamber as the volume of the main pump chamber of the main reciprocating pump increases is transferred through the through hole. is transmitted to the sub-pump chamber of the sub-reciprocating pump, thereby increasing the suction force of the sub-reciprocating pump.

[Effect of idea]

In this way, the negative pressure in the main pump chamber of the main reciprocating pump contributes to increasing the suction force of the chemical pump, so that the time required for the chemical pump to start sucking liquid can be shortened.

Since the pump chambers of the main reciprocating pump and the chemical pump do not need to be completely separated from each other, sealing of the outer circumference of the sub-plunger of the chemical pump can be omitted, or the tolerance of the sub-plunger and the inner circumferential surface of the sub-cylinder on which it slides can be omitted. can be made larger.

Furthermore, even if the chemical pump temporarily sucks air after the chemical pump sucks liquid and the pressure in the sub-pump chamber reaches the specified pressure, this air can be removed via the main reciprocating pump, so the chemical pump The inability to absorb liquid due to air suction can be avoided.

〔Example〕

This invention will be explained below with reference to the illustrated embodiment.

FIG. 1 is a sectional view showing a chemical pump according to this invention. In the figure, 1 is a main reciprocating pump as an existing reciprocating pump, and a cylinder ( A through hole 4 communicating with the inside of the cylinder (referred to as the "main cylinder") 3 is drilled into the through hole 4, and a cylinder (referred to as the "auxiliary cylinder") of a sub reciprocating pump 5 as a chemical pump is connected to the through hole 4.
A base end opening 7 of the main reciprocating pump 1 is connected to the main pump chamber 8 of the main reciprocating pump 1 through an O-ring 26 in an air-water tight manner. The main plunger 12 and the sub-plunger 13 are arranged so as to be able to slide inside the main cylinder 3 and the sub-cylinder 6, respectively, and the opening 7 of the sub-cylinder 6 has an increased inner diameter in order to insert an elastic member therein. A portion 14 is formed. The C-ring 15 is fastened to the base end of the sub-plunger 13, and is prevented from coming off with a washer 16. A compression coil spring 17, which is an elastic member, is compressed between the stepped portion of the increased inner diameter portion 14 and the washer 16, and surrounds the outer periphery of the sub-plunger 13. Water sucked into the main pump chamber 8 of the main reciprocating pump 1 is discharged from the main pump chamber 8 via the discharge valve 18, and in the sub-reciprocating pump 5, chemical liquid is sucked into the sub-pump chamber 22 via the suction valve 19. , is discharged from the sub-pump chamber 22 via the discharge valve 23. The through hole 24 extends along the central axis from the tip of the sub-plunger 13, bends radially outward in the vicinity of the C-ring 15, and reaches the increased inner diameter portion 14 where the compression coil spring 17 is disposed. .

FIG. 2 is a view taken in the direction of the arrow in FIG. A sub-reciprocating pump 5 as a chemical pump is attached to the tip of the manifold 2 of the existing main reciprocating pump 1. The main reciprocating pump 1 and the sub-reciprocating pump 5 are used to pump water and chemical liquid, respectively.

To explain the operation of the embodiment, the base end of the sub-plunger 13 is pressed against the distal end of the main plunger 12 by the biasing force of the compression coil spring 17.
Therefore, the sub plunger 13 is the main plunger 12.
It reciprocates in conjunction with the reciprocating movement of the main pump chamber 8 and the sub-pump chamber 22, and the volumes of the main pump chamber 8 and the sub-pump chamber 22 increase and decrease. Main pump room 8
As the volume of the main pump chamber 8 increases, negative pressure is generated in the main pump chamber 8, and this negative pressure is transmitted to the sub pump chamber 22 via the through hole 24. As a result, the suction force of the auxiliary reciprocating pump 5 increases, the liquid suction performance of the auxiliary reciprocating pump 5 improves, and the time until the start of liquid suction can be shortened. Further, even if the sub-reciprocating pump 5 temporarily sucks air after the sub-reciprocating pump 5 sucks liquid and the sub-pump chamber 22 reaches the specified pressure, this air is sucked by the negative pressure from the main pump chamber 8. can be removed via the main reciprocating pump 1.
Inability to suck liquid due to air suction by the sub-reciprocating pump 5 can be avoided. Note that, since the through hole 24 has a sufficiently small cross-sectional area, the chemical liquid in the sub-pump chamber 22 hardly reaches the main pump chamber 8.

Furthermore, since the main pump chamber 8 and the sub-pump chamber 22 do not need to be strictly separated from each other, the sub-plunger 1
3 can be omitted, and the intersection between the inner peripheral surfaces of the sub-plunger 13 and the sub-cylinder 6 on which it slides can be increased.

3 to 8 show other examples of the through hole 24. A is a vertical sectional view or a side view, and b is a view seen from the right side of a. In a, the left side shows the sub pump chamber 22 side, and the right side shows the main pump chamber 8 side.

In FIG. 3, the through hole 24a extends along the central axis and passes through it.

The through hole 24b in FIG. 4 extends along the central axis;
an increased inner diameter portion 14 extending radially outwardly and disposed with a helical compression spring 17;
It has led to.

In FIG. 5, both side surfaces of the sub-plunger 13 are cut, and a through hole 24c is formed therein.

In FIG. 6, a through hole 24d with a V-shaped cross section extending in the axial direction is formed on the surface of the sub-plunger 13.

In FIG. 7, the through hole 24e is formed as a groove with a rectangular cross section extending on the surface of the sub-plunger 13.

In FIG. 8, the sub-plunger 13 has one cut surface, and a through hole 24f is formed by this cut surface.

As described above, the purpose of this invention is to improve the liquid suction capacity of the sub-reciprocating pump by imparting part of the liquid suction capacity of the main reciprocating pump through the through hole provided in the sub-plunger. In the structure of the invention, the sub-plunger 13 is brought into contact with the main plunger 12 by the elastic member 17 to achieve interlocking, but it is also possible to interlock the sub-plunger 13 with the main plunger 12 by screwing or integrating it. belongs to the technical scope of

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a chemical pump according to this invention, Fig. 2 is a view shown in the direction of the arrow in Fig. 1,
FIGS. 3 to 8 are diagrams showing other examples of through holes. In the figure, 1... main reciprocating pump, 3...
Main cylinder, 4... Through hole, 5... Sub reciprocating pump (chemical pump), 6... Sub cylinder, 7... Opening, 8... Main pump chamber, 12... Main plunger, 13... Sub plunger , 17... Compression coil spring (elastic member), 22... Sub-pump chamber, 24,
24a to 24f are through holes.

Claims (1)

[Claims for Utility Model Registration] (1) The base end opening 7 of the sub cylinder 6 of the sub reciprocating pump 5 is fitted into the through hole 4 of the manifold 2 which communicates with the main cylinder 3 of the main reciprocating pump 1. The elastic member 17 is connected to the main pump chamber 8 of the main reciprocating pump 1, and the elastic member 17 is connected to the sub plunger 1 of the sub reciprocating pump 5.
3 toward the main plunger 12 of the main reciprocating pump 1, the sub-plunger 13 of the sub-reciprocating pump 5,
A chemical pump characterized in that a through hole 24 is formed to communicate between the pump chambers 8 and 22 of the main reciprocating pump 1 and the sub reciprocating pump 5. (2) The chemical pump according to claim 1, wherein one or more through holes 24 are formed on or inside the sub-plunger 13 of the sub-reciprocating pump 5.