JP3115349B2 - Fluid device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pump for pumping a liquid, a nozzle for ejecting the liquid pumped from the pump, a cock for opening and closing the nozzle, the pump and the cock. And an unloader disposed in a flow path between the fluid device and the fluid device.

[0002]

2. Description of the Related Art Fluid devices of the type described above are used, for example, in cleaning devices for cleaning articles with a liquid.
In such an apparatus, when the cock of the nozzle is closed to interrupt the cleaning, the load on the unloader is released, which greatly contributes to the durability of the pump. However, even if the pump is stopped, pressure remains in the flow path such as a hose between the unloader and the cock of the nozzle. Therefore, the cock of the nozzle is opened to release the pressure, thereby preventing an unexpected accident due to the residual high pressure. It was necessary to perform safe operation for.

[0003]

SUMMARY OF THE INVENTION According to the present invention, there is no need to open the nozzle cock artificially each time the pump is stopped.
When the pump is stopped, the flow in the flow path between the pump and the cock
Automatically operates by residual pressure to transfer residual liquid to tank
And automatically release the residual pressure in the flow path between the unloader and the cock of the nozzle, in particular, 200 kgf / cm ²
It is an object of the present invention to provide a fluid device of the type described above, which enhances safety when using a high-pressure pump that exceeds the pressure.

[0004]

That is, a pump for pumping liquid from a tank, a nozzle for ejecting liquid pumped from the pump, a cock for opening and closing the nozzle, and a pump for opening and closing the nozzle. the fluid device according to the type of the present invention including an arranged unloader in the flow path between the cock, after allowed stopped state <br/> the pump closing the cock so as to interrupt the liquid jet To the residual pressure in the flow path
Thus the automatically operating the remaining liquid, characterized in that allowed interposed between the extra Mizuguchi before SL channel of the automatic pressure release valve back to the tank the unloader.

[0005]

Next, the present invention will be described with reference to the drawings. FIG. 1 is a schematic partially cutaway system diagram of a first embodiment in which the present invention is applied to a cleaning apparatus, and FIG. 2 is a sectional view of a main part of a second embodiment of the present invention. First, as shown in FIG. 1, a cleaning apparatus according to a first embodiment includes a tank 1 for storing a cleaning liquid and a pump of a plunger type or the like for pumping the cleaning liquid from the tank 1 and pumping the same. 2, a prime mover 3 such as an internal combustion engine for driving the pump 2, and the pump 2
An unloader 5 connected to the water outlet 4, a nozzle 6 for injecting the cleaning liquid onto the article to be cleaned, and a trigger type or the like for interrupting the flow of the cleaning liquid injected from the nozzle 6. A cock 7 and an automatic pressure release valve 8 for automatically releasing pressure as described later, and a water outlet 9 of the unloader 5 is connected to the cock 7 and the nozzle 6 through a flow path 10 such as a hose, The spill port 11 of the unloader 5 is connected to the tank 1 by a spill return line 12, and the discharge-side pressure port 13 of the automatic pressure release valve 8 is connected to the flow path 10 through a branch 14, The unloader spill water side pressure port 15 of the release valve 8 communicates with the spill water return pipe 12.

[0006] The unloader 5 is provided with a water outlet 4 of the pump 2.
And a spill valve 17 provided in a valve path to the spill port 11 of the unloader 5 and a spill valve 17 provided in a valve path to the spill port 11. The valve 16 and the spill valve 17 are axially opposed to each other.
9 pressurizes the spill valves 17 in the axial direction so as to keep them normally in the closed position. The spout check valve 16
Includes a ball valve body 20 therein.
Allows the flow of water from the water discharge port 4 of the pump 2 to the water discharge port 9 of the unloader 5, but is biased by the compression coil spring 21 to act as a check valve for preventing the reverse flow. I have.

The automatic pressure release valve 8 has a ball valve body 22 for opening and closing the discharge side pressure port 13 having a small opening area.
A plunger 23 having a relatively large pressure receiving area for receiving the residual pressure in the flow path 12 from the unloader residual pressure port 15 and pressing the ball valve body 22 in a direction to close the discharge pressure port 13 is provided. Also, the drain port 4 of the automatic pressure release valve 8
Numeral 2 is connected to the tank 1 by a flow path (not shown) so that high-pressure water remaining in the flow path 10 flowing from the discharge-side pressure port 13 through the ball valve body 22 to the tank 1 is returned to the tank 1 as described later. Has become. In FIG. 1, reference numeral 44 denotes a stopper for preventing the plunger 23 from falling off when the discharge-side pressure port 13 is opened.

With the above-described structure, the pump 2 is driven by the internal combustion engine 3 and the tank 1
When the washing liquid from the nozzle is discharged to the unloader 5, the discharged water pushes the ball valve body 20 of the water discharge check valve 16 of the unloader 5 to flow to the water discharge port 9, and further flows from the nozzle 6 through the flow path 10 and the cock 7. And wash the goods. At this time,
The pressure-adjusted residual water of the cleaning liquid that has entered the unloader 5 from the pump 2 pushes up the spill valve 17 against the spring 19 and returns to the tank 1 through the spill return line 12. During this time, the force for pushing up the plunger 23 of the automatic pressure release valve 8 due to the residual water residual pressure is greater than the force for pushing down the ball valve body 22 due to the internal pressure of the flow path 10, so the discharge side pressure port 13 is closed, The inside of the flow path 10 is maintained at a predetermined high pressure. When the cock 7 is closed to interrupt the cleaning operation, the flow path 10
The pressure inside rises rapidly, and this sudden rise in pressure raises the water discharge check valve 16 of the unloader 5 to push up the spill valve 17, so that excess pressure escapes to the spill port 11 side and is alleviated. . When the pump 2 is stopped in this state, a considerable fluid pressure remains in the flow path 10. The residual pressure in the flow path 10 is guided to the discharge-side pressure port 13 of the automatic pressure release valve 8 through the branch path 14, and the unloader spill-side pressure port 15 side of the automatic pressure release valve 8 is in a non-pressure state. Therefore, the ball valve body 22 is immediately pushed down, and the discharge-side pressure port 13 is opened. For this reason, the liquid in the flow path 10 is
Through the automatic pressure release valve 8, and further from there through the drain port 42 to the tank 1, thus automatically releasing the residual pressure in the flow path 10, Can be maintained. If the residual pressure on the unloader spillage side pressure port 15 during operation is too low and the automatic pressure release valve 8 is activated, the spillage return line 12
Then, a suitable back pressure may be applied by interposing a pinch cock 43 or the like.

Next, in another embodiment shown in FIG. 2, FIG.
An unloader 24 having a structure different from the structure of the unloader 5 in the embodiment of the present invention is provided.
5 is disposed between a pump (not shown) and the unloader 24, and the automatic pressure release valve 25 communicates between a water discharge port (not shown) of the pump and an inlet 26 of the unloader 24. And a water discharge passage 27 which is provided. Further, the unloader 24 has a water outlet 29 communicating with a cock (not shown) of a nozzle through a flow path 28 and a spill port 30 communicating with a tank (not shown). A spring biased check valve 31 is provided, and a spill port 30 is provided with a pressure regulating valve 33 biased to a closed position by a pressure regulating spring 32. A side of the pressure regulating spring 33 of the pressure regulating valve 33 is connected to a passage 34.
A pressure receiving chamber 35 that is communicated with the water discharge port 29 through the pressure receiving chamber 35 to receive the pressure from the flow path 28 side. When the pressure in the pressure receiving chamber 35 becomes higher than the spring force of the pressure adjusting spring 32, the pressure adjusting valve 33 The spill port 30 is lifted up to open.

The automatic pressure release valve 25 is connected to the flow path 28
A discharge-side pressure port 37 having a small opening area for receiving the pressure in the flow path 28 and connected through the branch path 36, a cylindrical valve member 38 having an upper end for opening and closing the inner end of the discharge-side pressure port 37; A piston member 39 having a pressure receiving surface larger than the discharge-side pressure port 37 and slidably supporting a lower end of the valve member 38. The lower end of the piston member 39 communicates with the tank through a non-
Through the water discharge passage 27. Therefore,
During the operation of the pump, the reduced diameter opening 41 of the automatic pressure release valve 25
From the outlet side pressure port 37
Is closed, the pressure on the flow path 28 side is maintained at a predetermined value.

With the above-described structure, during the cleaning operation, the water discharged from the pump enters the unloader 24 through the water discharge passage 27, and the check valve 31 is opened by the pressure, and the water is discharged from the nozzle through the nozzle cock through the flow passage 28 through the nozzle cock. It is injected. During operation, the spill water is opened by opening the pressure regulating valve 33 according to the pressure on the discharge side acting on the pressure receiving chamber 35 of the unloader 24.
Is returned to the tank and the pressure is adjusted. When the cleaning operation is completed and the cock of the nozzle is closed, the pressure in the flow path 28 rapidly increases, so that the pressure in the pressure receiving chamber 35 of the unloader 24 rises, and the pressure regulating valve 33 is opened. From the spill port 30. When the pump is stopped in this state, the residual pressure in the flow path 28 is transmitted to the discharge-side pressure port 37 of the automatic pressure release valve 25 through the branch path 36, and the pressure in the water discharge path 27 is released. By pushing down the valve member 38 and the piston member 39 of the valve 25, the discharge side pressure port 37 is opened to the drainage passage 40, and the residual pressure in the flow passage 28 can be automatically released. In the embodiment of FIG. 2, since the pump discharge pressure can be used as the closing force of the valve member 38, the automatic pressure release valve 25 can be reduced in size and processing can be facilitated, which is preferable.

[0012]

As described above, according to the present invention, when the pump is stopped without artificially opening the cock of the nozzle , the residual pressure in the flow path between the pump and the cock increases.
It operates automatically to return the residual liquid to the tank, and automatically releases the residual pressure in the flow path between the unloader and the nozzle cock, improving safety when using the high-pressure pump. It is simple and easy to manufacture, and has effects such as being particularly advantageously applicable to a small fluid machine.

[Brief description of the drawings]

FIG. 1 is a schematic partially cutaway system diagram of a first embodiment in which the present invention is applied to a cleaning apparatus.

FIG. 2 is a sectional view of a main part of a second embodiment of the present invention.

[Explanation of symbols]

 2 Pump 5,24 Unloader 6 Nozzle 7 Cock 8,25 Automatic pressure release valve 10,28 Flow path

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Setsuo Hasegawa 1-7-2 Suehirocho, Ome-shi, Tokyo 2 Kyoritsunai Co., Ltd. (56) References JP-A-60-150489 (JP, A) JP-A-63 -104691 (JP, A) JP-A-2-35955 (JP, A) JP-A 1-118276 (JP, U) JP-A 56-35571 (JP, U) JP-A 62-16229 (JP, Y2) (58) Fields surveyed (Int.Cl. ⁷ , DB name) B67D 5/32-5/34 B05B 9/00-9/08 B08B 3/02

Claims (1)

(57) [Claims] Closing and 1. A liquid tank (1) for pumping from the pump (2), a nozzle (6) for injecting pressurized liquid from the pump (2), the nozzle (6) a cock (7) for, in type of fluid apparatus comprising a flow path and an unloader disposed (10, 28) (5 and 24), the between the said cock and pump (2) (7) and closing said cock (7) in order to interrupt the liquid jet
After the pump (2) is stopped in the state, the automatic pressure release valve () automatically operates by the residual pressure in the flow path (10, 28) and returns the residual liquid to the tank (1). 8,
25), more than Mizuguchi before Symbol unloader (5, 24) (1
A fluid device characterized by being interposed between the flow path (10, 28) and the flow path (10, 28).