JPH027648Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a plunger structure of a power sprayer configured with a plunger pump.

(b) Prior Art In conventional plunger-type power sprayers, a water intake port was provided in the middle of the plunger on the outer periphery to prevent water from leaking from the seal to the crank part due to water pressure.

However, if the water inlet is provided on the outer periphery of the plunger, the passage for the chemical solution must be provided inside the plunger, so the liquid must be passed through the water inlet between the parent plunger and the child plunger, and then entered into the cylinder through the water intake valve at the head of the plunger. Discharge,
It was constructed so that it was discharged from the discharge port.

Therefore, the plunger requires two parent and child plungers in the front and back, and in order to install the child plunger, a fixed disk with honeycomb-like holes must be installed, and the valve must be attached to a spring or valve cap. Since the water intake valve, which consists of parts such as It is.

(c) Problems that the invention aims to solve In order to solve the above-mentioned problems, the invention reduces the number of parts by providing a child plunger outside the parent plunger and having a part of the child plunger function to open and close the valve. This aims to reduce the number of assembly steps, improve durability, and reduce costs compared to conventional products.

(d) Means for solving the problem The purpose of the present invention is as described above. Next, the configuration for achieving the purpose will be explained.

The main plunger 6a is attached to the conrod 3 that moves back and forth.
A child plunger 6b is arranged in a cylindrical shape on the outside of the main plunger 6a via a chemical passage, and a V-packet 12 is attached to the outer periphery of the child plunger 6b.
In the structure in which a valve 10 and a child plunger holder 19 are fixed before and after the main plunger 6a, the valve 10 and the child plunger holder 19 are fixed.
9, the child plunger 6b is shorter than the interval.
The valve 10 is composed of an edge 10a that comes into contact with the cylindrical end surface of the child plunger 6b, and a convex part 10b that has a notch that forms a liquid medicine passage, and the child plunger holder 19 is attached to the cylinder of the child plunger 6b, etc. It is composed of an edge 19a where the end faces come into contact and a notch forming a medicinal solution passage, and by moving the child plunger 6b back and forth with a delay with respect to the back and forth movement of the main plunger 6a, the gap between the child plunger 6b and the valve 10 is It is configured to open and close.

(E) Embodiment The purpose and structure of the present invention are as described above. Next, the structure of the embodiment shown in the attached drawings will be explained.

FIG. 1 is an overall side sectional view of the power sprayer. Second
The figure is an enlarged side sectional view of the plunger part of the present invention. FIG. 3 is a sectional view taken along the line AA in FIG. 2. FIG. 4 is also a BB sectional view.

As shown in FIG. 1, the power obtained by the engine or motor is transmitted to the crankshaft 2 via the pulley. A connecting rod 3 is pivotally supported on the crankshaft 2 within a crankcase 1, and the other end of the connecting rod 3 is pivotally supported on a parent plunger base 9 by a plunger pin 4.

Then, the plunger base 9 reciprocates within the guide metal 5. A parent plunger 6a is fixed to this plunger base 9 with a nut 8 and is reciprocated.

The water inlet 7 is opened by the reciprocating movement of the parent plunger 6a.
The chemical liquid flows in, passes between the parent plunger 6a and the child plunger 6b, and is force-fed to the water spout 14 by the discharge valve 13.

Reference numeral 15 is a pressure chamber, which functions to keep the discharge pressure constant, and reference numeral 16 is a safety valve reflex lever, which is used when it is desired to manually lower the water pressure.When the water pressure becomes excessive, the safety valve is activated and water is discharged from the overflow port 17.

Next, the structure of the parent-child plunger of the present invention was
This will be explained with reference to FIG. 3, FIG. 4, and FIG.

The main plunger 6a consists of one shaft, one end of which is fixed to the plunger base 9 with a nut 8, and the diameter is reduced from the middle part so that the child plunger 6b can be attached thereto. In this small diameter part, a valve 10, a collar 11, a child plunger 6b,
The sub-plunger holder 19 is inserted in sequence, fixed with a nut 22, and assembled.

The valve 10 has an edge 10a;
is equal to the cylindrical bottom surface of the child plunger 6b,
As shown in the sectional view of FIG. 4, the convex portion 10b has a semicircular notch on the left and right sides, and the notch serves as a passage for the chemical solution when the valve 10 is opened.

As shown in FIG. 3, the sub-plunger holder 19 has a half-moon shape cut out from the left and right sides up to the edge of the valve 10, and the cutout portion serves as a flow path for the chemical solution.
Valve edge 10a and child plunger holder 19
The front and rear end surfaces of the child plunger 6b are in contact with the edge 19a of the valve, and the collar 11 is such that the child plunger 6b is in contact with the edge 10a of the valve and the child plunger presser 19.
It serves as a spacer to provide a sliding gap between the edges 19a of the.

A V-packet 12 for preventing water leakage is fitted between the child plunger 6b and the cylinder 18, and the spring 2
1, and a water stop seal 20 is installed to prevent water leakage between the cylinder and the crankcase.
is fitted.

In such a configuration, when the parent plunger 6a slides in the direction of the discharge port due to crank movement,
When the bottom surface of the sub-plunger 6b hits the valve edge 10a and stops the inflow, pushes out the medicinal liquid into the discharge valve 13, and slides in the opposite direction, the sub-plunger 6b
The top surface hits the edge 19a of the sub-plunger holder, the space between the bottom of the sub-plunger 6b and the valve 10 is opened, and the chemical solution passes from the notch in the valve, between the sub-plunger 6b and the collar 11, and through the notch in the sub-plunger holder. , flows into the cylinder,
Spraying work is performed by repeating the above operations.

(f) Effects of the invention Since the present invention is constructed as described above, it has the following effects.

First, the child plunger 6b is provided on the outside of the parent plunger 6a so as to be able to slide back and forth with a delay with respect to the back and forth movement of the parent plunger 6a, and the child plunger 6b is also used as the opening/closing part of the valve 10. As shown in the figure, it is possible to reduce the number of parts such as the fixed disk connecting the main plunger and the child plunger, the water intake valve, and the springs and caps attached to the water intake valve.

Second, by arranging the child plunger 6b outside the parent plunger 6a, the structure of the plunger is simple, making it easy to assemble, and the plunger can be configured with a reduced number of parts, making it more durable than before. This makes it possible to obtain a plunger with improved properties and reduced costs.

[Brief explanation of the drawing]

FIG. 1 is an overall side sectional view of the power sprayer. Second
The figure is an enlarged side sectional view of the plunger part of the present invention. FIG. 3 is a sectional view taken along the line AA in FIG. 2. FIG. 4 is also a BB sectional view. 6a... Parent plunger, 6b... Child plunger.

Claims (1)

[Scope of utility model registration request] The main plunger 6a is attached to the conrod 3 that moves back and forth.
A child plunger 6b is arranged in a cylindrical shape on the outside of the parent plunger 6a via a chemical passage, and a V-packet 12 is attached to the outer periphery of the child plunger 6b.
In the structure in which a valve 10 and a child plunger presser 19 are fixed before and after the main plunger 6a, the valve 10 and the child plunger presser 19 are fixed.
9, the child plunger 6b is shorter than the interval.
The valve 10 is composed of an edge 10a that comes into contact with the cylindrical end surface of the child plunger 6b, and a convex part 10b that has a notch that forms a liquid medicine passage, and the child plunger holder 19 is attached to the cylinder of the child plunger 6b, etc. It is composed of an edge 19a where the end faces come into contact and a notch forming a medicinal solution passage, and by moving the child plunger 6b back and forth with a delay with respect to the back and forth movement of the main plunger 6a, the gap between the child plunger 6b and the valve 10 is A power sprayer characterized in that it is configured to open and close.