JPH0133182Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to an improvement of a plunger type power sprayer in which a cylinder and a crankcase are not directly connected, but a lubrication chamber is provided between them.

<Prior art> As seen in the sectional view of FIG. 1, a plunger type power sprayer has a crank case 2 on a base 1.
and the pump case 3 are arranged horizontally, and the cylinder 4 is
A water intake port 5, a water intake valve 6, a discharge valve 7, and a discharge port 8 are provided at the tip of the cylinder 4.
It is a structure that moves back and forth inside. There is a pressure regulating valve 12 above the delivery 11 above the discharge valve 7, and when the pressure exceeds a certain level, excess water passes through the valve box 13, flows into the lubrication chamber 14, and flows out from the excess water port 15. .

<Problems to be solved by the invention> If the excess water is communicated from the valve box 13 to the lubrication chamber 14 and an escape route for the excess water is not created from the lubrication chamber 14, the excess water will remain filling the lubrication chamber 14. It will stay there, and the next drawback will appear.

(a) The lubrication chamber 14 is always filled with excess water and never dries out, which increases the swelling of the packing and leads to early breakage of the packing.

(b) Every time the power sprayer is used, the chemical solution remaining in the lubrication chamber 14 mixes with the discharged solution (sprayed solution).
It will have a negative impact on the objects being sprayed.

In order to solve the above problem, the lubrication chamber 14 and the spillage port 15 are
It was necessary to contact the government and create an escape route for the spillage, and to solve this problem, we first filed patent application No. 58-125872 and Jitsugan Sho.
Proposed in No. 59-41017. however,
These conventional methods require an operation to drain excess water using a tool or the like after the sprayer is stopped.

<Means for solving the problem> The present invention provides a new means for draining excess water from the lubrication chamber when not in use, and its structural feature is that the lubrication chamber as described above In a plunger-type power sprayer, a bypass passage is provided from the communication passage in the upper part of the lubrication chamber to the spillway in the lower part of the lubrication chamber, and when the connection end fitting of the spillwater hose connected to the spillway is connected to the spillway, the lubrication The main feature is that the chamber and the spillway are cut off, and the bypass passage and the spillway are connected.

<Function> With this structure, when the sprayer is used, surplus water accumulates in the lubrication chamber and prevents seizure inside the cylinder, and when the surplus water hose is removed after using the sprayer, the interior of the lubrication chamber Excess water will drain naturally.

<Example> FIG. 1 is a longitudinal cross-sectional view showing an example.
The figure is a sectional view taken along line AA in FIG. FIGS. 3 and 4 are longitudinal cross-sectional views showing other connection examples of the spill water hose, and FIG. 5 is a vertical cross-sectional view of an example provided with a drainage pot.

As seen in these figures, a high-pressure packing 17 and a low-pressure packing 19 are inserted behind the water suction chamber 16 of the cylinder 4 of a plunger-type power sprayer, and a surplus water chamber 20 is formed between the high-pressure packing 17 and the low-pressure packing 19. A lubrication chamber 14 is provided which communicates with the lubrication chamber 14. Furthermore, in a plunger-type power sprayer in which the overflow port 15 and the lubrication chamber 14 are connected, a bypass passage 22 is provided from the communication passage 21 above the middle of the lubrication chamber to the overflow port 15 at the bottom of the lubrication chamber. Then, the connection end fitting 2 of the spill water hose 23 connected to the spill water port 15
4 is shaped so that when connected to the spillway port 15, the lubrication chamber 14 and the spillway port 15 are cut off, and only the bypass passage 22 and the spillway port 15 are in communication. The connecting end fitting 24 shown in FIG. 1 is an example of the connection end fitting 24, which has a closed end portion of a cylindrical body, a blind protrusion 26 at that portion, and a spill water passage hole 27 on the side. 24 is inserted into the spillway port 15, the blind protrusion 26 will fit into the passage 28 between the lubricating chamber 14 and the spillway port 15 and close it, and the bypass passage outlet 29 and the spillwater passage hole 27 will align and the bypass will be completed. The structure is such that the excess water passes from the passage to the spill outlet 15.

In the structure shown in FIGS. 3 and 4 as an example of the connecting end fitting 24, a cylindrical valve 31 is inserted into a nipple 30 screwed into the spillway 15 so as to be movable forward and backward.
A protrusion is provided at the tip of the cylindrical valve 31, and a seal 3 is attached to the protrusion.
2 is installed. The tip of the cylindrical valve 31 is provided with a spill water passage hole 27 as in the above example,
Furthermore, a protrusion 33 is provided on the outer periphery, and a spring 34 is externally inserted to the tip of the protrusion 33, and elastically supported between the protrusion 33 and the inner wall of the spillway. When the spill water hose is connected as shown in FIG. The passage 28 between the lubrication chamber and the spillway is closed. This allows surplus water to be stored in the lubrication chamber 14. At this time, the outlet 29 of the bypass passage 22
and the surplus water passage hole 27 of the cylindrical valve 31 are aligned. After using the sprayer, when the spill water hose is removed, the spring force causes the gasket 32 to separate, opening the passage 28 between the lubrication chamber and the spill port, and the excess water in the lubrication chamber is drained from the spill port. It is excreted. As shown in FIG. 5, a stop 37 with a lever 36 may be provided in the passage 28 between the lubrication chamber and the spillway to drain excess water.

With this structure, liquid from the tank etc. enters from the water inlet 5 through the water intake valve 6 and the water suction chamber 16 when the plunger 9 retreats, and then is delivered from the discharge valve 7 when the plunger 9 moves forward. 11, and is guided from the discharge port 8 to the spout through the discharge pot 25. When the liquid pressure in the delivery 11 exceeds a predetermined level, the pressure regulating valve 12 opens and the surplus water flows from the valve box 13 through the communication passage 21 to the lubrication chamber 1.
4 and accumulates in the lubrication chamber. The lubrication chamber 14 has a high pressure packing 17 of the cylinder 4 and a packing plate 1.
A seal is formed between the low pressure gasket 19 in the plunger 8 and the plunger 9, and surplus water is always supplied to the plunger surface. When the lubrication chamber becomes full, surplus water overflows and is discharged from the bypass passage 22 to the surplus water port 15 and collected into the tank.

<Effects of the invention> With the above structure, when the pressure exceeds a predetermined value during operation, the pressure regulating valve 12 opens and excess water accumulates in the lubrication chamber 14, resulting in a good lubrication effect. In addition, even if the liquid in the chemical tank runs out during work and a state of dry operation occurs, the lubrication chamber is always filled with surplus water, so both the high-pressure gasket and low-pressure gasket are lubricated by the residual water, causing burning. There is no need to worry about sticking. Furthermore, by removing the spillage hose after work is completed, the lubrication chamber and spillway port are communicated, and the excess water that filled the lubrication chamber is discharged to the outside, preventing the swelling of the gaskets and the excess water from mixing with the water every time you work. There will be no more.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing the embodiment, and the second
The figure is a sectional view taken along line AA in FIG. FIGS. 3 and 4 are longitudinal cross-sectional views showing other connection examples of the spill water hose, and FIG. 5 is a vertical cross-sectional view of an example provided with a drainage pot. 4...Cylinder, 5...Water inlet, 8...Discharge port, 9...Plunger, 11...Delivery, 12
...Pressure regulating valve, 14...Lubrication chamber, 15...Spill water port,
16...Water absorption chamber, 17...High pressure gasket, 19...
...Low pressure gasket, 20...Left water chamber, 21...Communication passage, 22...Bypass passage, 23...Left water hose, 24...Connection end fitting, 26...Blind protrusion,
27...Leftwater passage hole, 28...Passage between the lubrication chamber and spillwater port, 29...Bypass passage outlet, 31...Cylindrical valve, 32...Puttle, 34...Spring.

Claims (1)

[Scope of utility model registration request] It has a crank case and a pump case at the other end, and a high pressure gasket 17 and a low pressure gasket 19 are inserted into the rear of the water suction chamber of the cylinder.
In a plunger-type power sprayer in which a lubrication chamber 14 is provided between the lubrication chamber 7 and the low-pressure gasket 19, and a spillage port is connected to the lubrication chamber, from the middle of the lubrication chamber 14 to the communication passage above the lubrication chamber 14 to the spillage port 15 at the bottom of the lubrication chamber. A plunger type power sprayer characterized by being provided with a bypass passage 22.