JPH0427557Y2 - - Google Patents

Description

[Detailed description of the device] (a) Industrial application field This device has a through hole for draining the liquid in a part of the connecting member connected to the pressure accumulating chamber housed in the chemical tank. When the pressure of the chemical liquid on the through-hole side exceeds a certain value, the liquid pressure in the pressure accumulator is reduced by pressing the sliding member that is slidably fitted to the connecting member and causing the chemical liquid to flow back into the chemical liquid tank. This invention relates to a pressure regulating device for a manual sprayer that can maintain constant pressure.

(b) Conventional technology Conventionally, as shown in FIG. 2, for example, as shown in FIG. A rack 5 is carved below a piston rod 4 that is tightly fitted in a freely accessible manner and is fixed and suspended from the center of the piston packing 3, and a pinion 6 that engages with the rack 5 is fixed to the tip of the horizontal portion of the operating handle 7. A check valve 9 is installed in the center of a pedestal 8 that is fixed in the pressure accumulation chamber 2 above the piston packing 3, while the upright parts of the
While the interior is openable and closable, the upper end of the discharge pipe 10 whose lower end is open above the pedestal 8 is connected to the pressure accumulation chamber 2.
The connecting member 11 fitted to the upper end reduced diameter portion 2' is passed through, and the hose 1 is inserted through the thumbscrew 12 to the tip of the connecting member 11.
One end of the hose 13 is connected to the other end of the hose 13, and a nozzle 16 is attached to the tip of the hose 13 via a nozzle 14 and a jet pipe 15.

By swinging the upright part of the operating handle 7 toward the front with respect to the plane of the drawing, the piston rod 4 moves up and down due to the engagement between the pinion 6 and the rack 5, thereby causing the chemical liquid 17 pressurized by the piston packing 3 to move up and down. passes through the check valve 9 and flows into the upper part of the pedestal 8, gradually compressing the air inside. After the chemical liquid 17 flows from the lower end of the discharge pipe 10 by this compressed air,
A spray is ejected from a nozzle 16 via a hose 13, a spout 14, and a jet pipe 15.

(c) Problems to be solved by the invention In the above-mentioned manual sprayer, the pressure of the air in the pressure accumulation chamber 2 varies depending on the operating force and the number of operations of the operating handle 7, and therefore the spray from the nozzle 16 Since the amount of spray differs, workers manually adjust the amount of spray, but in general, strong workers tend to increase the pressure in the pressure accumulation chamber 2 more than necessary.
For this reason, it is necessary to select in advance the strength of the piston seal 3, piston rod 4, pressure accumulation chamber 2, etc. to be larger than necessary, and therefore, the specified pressure must be set to a higher pressure than the working pressure required for spraying. From this point of view, the above-mentioned members have become strong and large, but on the other hand, it has become difficult for workers with normal strength to achieve the desired pressure, and there are problems such as difficulty in handling them. There is.

(d) Means for solving the problem This invention was made by paying attention to the above-mentioned problem, and the discharge pipe is fixed to the pressure accumulation chamber housed in the chemical liquid tank via a connecting member, and the discharge pipe is In the manual sprayer, the connecting member is provided with a through hole communicating with the liquid feeding hole near the upper end of the pressure accumulating chamber, and a sliding contact body for opening and closing the through hole with respect to the chemical liquid tank is connected to the connecting member. Fits slidably on the outer periphery of the member,
A support body that always springs and biases this sliding body toward the pressure accumulator side and holds the resilient body in a fixed position at the upper end is attached above the connecting member, and when the pressure inside the pressure accumulation chamber exceeds a certain value, By moving the sliding contact member, the through hole is opened to the chemical liquid tank, and the chemical liquid in the pressure accumulating chamber is allowed to flow back into the chemical liquid tank, thereby making it possible to adjust the pressure in the pressure accumulating chamber to a constant value.

(e) Effect In this device, the sliding body only slightly displaces the outer periphery of the connecting member due to the elastic force of the elastic body until the pressure of the chemical solution in the pressure accumulator reaches a predetermined constant value. When the pressure in the pressure accumulator rises and the pressure of the chemical liquid flowing into the discharge pipe exceeds the above-mentioned constant pressure, the pressure of the chemical liquid in the liquid sending hole and the through hole bored in the connecting member also increases. Therefore, the sliding body is pushed up against the elastic force of the elastic body, and the through hole is communicated with the chemical tank.
As the chemical liquid in the pressure accumulating chamber is returned to the chemical liquid tank through the through hole, the pressure of the chemical liquid in the pressure accumulating chamber automatically decreases and returns to the predetermined constant value. Therefore, the pressure of the chemical liquid in the pressure accumulator is automatically adjusted.

(f) Examples This invention will be explained below based on examples with reference to FIG. 1. A presser piece q is superimposed on the inner surface of the bulge e at a proper upper end of the chemical tank T via a packing p, and the presser piece q is placed and fitted inside and outside the bulge e of the connecting member J. The connecting member J is integrally connected to the chemical liquid tank T by screwing the nut 21 and the support body 22 into the respective male threads, and the liquid is fed along the vertical axis y-y of the connecting member J. A hole 23 is bored, and the upper end of a discharge pipe 24 communicating with the lower end of the liquid feeding hole 23 is inserted and fixed under the connecting member J, while a lid body 25 is placed on the flange f at the lower end of the connecting member J. The upper end of the body 26 is fitted and fixed inside the bent piece k on the outer peripheral edge of the body 26, and the lid 25 and the body 26 form a pressure accumulation chamber A. In addition, a sliding contact body S having a gasket b attached to the lower end that can be brought into and out of contact with the center portion of the lid body 25 is attached to the connection member J.
A resilient body 27 in the form of a coil spring is slidably fitted to the outer peripheral edge of the sliding body S and stretched between the upper recess v of the sliding body S and the support body 22. always,
A through-hole 28 that is resiliently biased downward and opens into a space g formed below the sliding body S is perpendicular to the liquid feeding hole 23 and is intersected and drilled below the connecting member J. However, when the pressure of the chemical solution d in the pressure accumulation chamber A is within a predetermined constant value, the sliding body S is held at the solid line position in FIG. 1 by the resilient force of the resilient body 27, and the constant value is maintained. When the force is exceeded, the sliding body S is lifted along the connecting member J by overcoming the elastic force, so that the through hole 28 can be opened to the chemical tank T. Incidentally, a spraying means (not shown) such as a nozzle 9 is attached to the tip of a hose 30 connected to the upper end of the connecting member J by a thumbscrew 29, as in the prior art. In the figure, r is an "O" ring.

In this invention, the pressurizing means in the pressure accumulator A is the same as in the conventional one, but the chemical solution d in the pressure accumulator A is
flows through the discharge pipe 24, and then flows into the liquid feeding hole 23 and the through hole 28 in the connecting member J, and the pressure of the chemical solution d flowing within the discharge pipe 24 reaches a predetermined constant value. Up to this point, although the sliding body S was slightly displaced up and down from the position shown by the solid line in FIG. Therefore, the chemical solution d rises inside the liquid feeding hole 23, reaches the hose 30, and is further ejected from the nozzle via a not-shown tip. However, if the pressure in the pressure accumulation chamber A further increases and the chemical solution d flowing in the discharge pipe 24 exceeds the predetermined constant pressure, the pressures in the liquid feeding hole 23 and the through hole 28 will also become the same. Since it is a pressure, the downward elastic force of the elastic force 27 is overcome and the sliding body S is largely displaced toward the support body 22, and the through hole 28 is opened and communicated with the chemical tank T, so that the pressure is accumulated. The chemical solution d in the chamber A is returned to the chemical solution tank T through the through hole 28, and therefore the pressure of the chemical solution d in the pressure accumulating chamber A is automatically lowered and returned to a predetermined constant value. That is, pressure accumulation chamber A
The pressure of the chemical liquid inside is automatically adjusted, and the pressure is always maintained.
A chemical solution with a constant pressure can be sprayed from the nozzle.

(g) Effects As explained above, when the chemical liquid in the pressure accumulator is under pressure within a certain value, this invention allows the through hole and the chemical liquid tank to be separated without causing large displacement of the sliding contact body. Since the communication is cut off, the spray is sprayed from the nozzle via the hose, similar to conventional manual sprayers, but when the pressure of the chemical solution in the pressure accumulation chamber exceeds a certain value, the sliding contact body will be greatly displaced. The through hole communicates with the chemical tank, and the pressure is automatically lowered and adjusted to a certain value, and the chemical liquid can be maintained at a constant pressure at all times, so the strength of the pressure accumulation chamber, discharge pipe, operating handle, etc. is required. It is possible to always apply a constant pressure to the chemical solution without having to maintain it above a certain level, and regardless of the strength of the worker operating the operating handle.
Uniform spraying is possible, and the proposed product can be obtained by making minor modifications to existing products, so it has practical benefits such as convenience for users.

Furthermore, in this embodiment, the pressurized chemical solution in the pressure accumulation chamber is returned to the chemical solution tank, so that
There is no risk of unexpected injury due to the leakage of the chemical solution to the outside, and it is suitable from the standpoint of safety management.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway vertical sectional view of the main part of this invention, and FIG. 2 is a partially cutaway vertical sectional view of the main part of a conventional manual sprayer. A... Pressure accumulator, J... Connection member, S... Sliding body, T... Chemical solution tank, 22... Support body, 23...
...Liquid feeding hole, 24...Discharge pipe, 27...Bullet body, 2
8...Through hole.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A discharge pipe 24 is fixed to a pressure accumulation chamber A housed in a chemical tank T via a connecting member J, and the discharge pipe 2
In a manual sprayer that can connect a spraying means to 4,
A liquid feeding hole 2 is provided near the upper end of the pressure accumulating chamber A of the connecting member J.
A through hole 28 communicating with the through hole 2 is bored.
8 to open and close the chemical tank T,
A support body 22 that is slidably fitted to the outer peripheral edge of the connecting member J and that keeps an elastic body 27 in a fixed position at the upper end, which always springs and urges the sliding body S toward the pressure accumulating chamber A side. , the pressure regulation of the manual sprayer is mounted above the connection member J, and when the pressure in the pressure accumulation chamber A exceeds a certain value, the through hole 28 is opened to the chemical tank T by the movement of the sliding contact body S. Device. (2) The pressure regulating device for a manual sprayer according to claim 1, wherein the through hole 28 intersects and communicates with the liquid feeding hole 23 at a right angle.