JPH03172766A - Liquid flow detecting device for conduit - Google Patents

Abstract

PURPOSE:To detect the state of the flow of liquid in the conduit automatically by a simple method by composing a liquid flow detection switching element of a conduction seat and a movable contactor in the conduit. CONSTITUTION:When liquid flows in the conduit 21 under specific pressure, the movable contactor 14 is pressed out downstream with the dynamic pressure against a spring 13 to separate from the conduction seat 6, and the liquid flow is interposed between the conduction seat 6 and movable contactor 14 to make the electric resistance between the both infinite; and a liquid flow detection switch 1 turns off and a light emitting diode 25 does not emit light. If the liquid does not flow with the specific pressure owing to the blocking of the conduit 21, there is no force which pushes the movable contactor 14 out against the spring 13, and the conduction seat 6 and movable contactor 14 are connected electrically to close the liquid flow detection switching element. Consequently, the conduction seat 6 and a spring seat 8 are connected electrically through the liquid flow detection switch 1 and the light emitting diode 25 emits light to indicate abnormality occurrence to a driver's seat.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention is used for engine oil supply pipes in one-stroke two-stroke engines, oil supply pipes for various other machine tools, etc. The present invention relates to a liquid flow detection device for pipes that detects a state.

[Prior Art] In the engine oil supply pipe of a two-stroke engine with separate oil supply, the flow of oil may decrease due to clogging of the flow path or malfunction of the oil pump. There was no way to issue a warning to the driver or worker, and the problem could only be confirmed by directly visualizing the cause, such as checking the engine compartment.

[Problems to be Solved by the Invention] On the other hand, as a means for detecting the flow state of liquid in the pipe, a float moved by fluid is built into the pipe, and the position of the float can be confirmed from the outside. There is a means to check whether there is a flow in the pipe by checking the float.

However, such methods require inspection of the engine room as mentioned above, making it impossible to respond quickly to troubles that occur, and leading to secondary troubles such as engine seizure. There was a problem.

As a device for automatically detecting the liquid flow, means for magnetically or optically detecting the movement of the float may be considered, but this would pose problems in that the device would be complicated and large.

SUMMARY OF THE INVENTION An object of the present invention is to provide a liquid flow detection device that can automatically detect the state of liquid flow in a pipe with a simple means.

[Means for Solving the Problems] The present invention provides a spring seat on the downstream side and a conductive seat on the upstream side, spaced apart in the flow direction in a conduit, and a spring and a conductive movable contact between both seats. The springs are arranged sequentially from the downstream side, and the springs bias the movable contact so that it can come into contact with the upstream side conduction, and the spring constant of the spring is changed so that the movable contact is retracted by the generation of the required hydraulic pressure. By setting it so that it becomes a biasing force that releases contact with the upstream side outside the conduction, a liquid flow detection switching element is configured between the movable contact and the conduction seat, and the required force is applied to the movable contact and the conduction seat. This is a liquid flow detection device for pipes that is electrically connected.

[Function] When the liquid is flowing normally in the pipeline with the required dynamic pressure applied, the liquid pressure pushes the movable contact downstream against the spring, and the movable contact becomes upstream conductive. The movable contact and the conductive seat are separated from each other, and accordingly, a flowing liquid is interposed between the movable contact and the conductive seat.

Since this flowing liquid has an infinite resistance value, the movable contact and the conductive seat become electrically non-conductive.

On the other hand, if the flow of liquid in the pipe stops or its flow velocity decreases and the liquid pressure becomes less than the required value, the pressure on the downstream side that the movable contact receives will decrease, so a single biasing force will be applied to the liquid. The movable contact contacts the conductive seat on the downstream side. As a result, the movable contact and the conductive seat are electrically connected. As a result, a liquid flow detection switching element is constructed between the movable contact and the conduction seat. Therefore, a detection circuit is constructed by the required electrical connections for the movable contact and the conduction seat, respectively, and the liquid flow detection switching element is configured between the movable contact and the conduction seat. By closing the switching element, a warning lamp is turned on, or necessary control is performed via the central control unit CPU.

[Example] An embodiment of the present invention will be described with reference to FIGS. 1-3.

Reference numeral 1 denotes a liquid flow detection switch connected to a required pipe line, and this configuration will be described in detail.

Beak-shaped threaded parts 5a and 5b at the front and rear of the cylindrical synthetic resin base 3
An insulating holder 2 is constructed by screwing together the veneers 4a and 4b having A conductive seat 6 made of a conductive plate material is sandwiched between the two, and a spring seat 8 made of a similar conductive base material is sandwiched on the downstream side. This conduction seat 6
Liquid flow holes 7 and 9 are formed in the spring seat 8, respectively.

Further, on the inner peripheral surface of the insulating holder 2, as shown in FIG. A spring 13 and a spherical movable contact 1 are attached from the spring seat 8 III at the downstream position. Each of the protrusions 10 constituting the operating path 11 has its tip serving as a guide edge for the movable contact 1, and the circumferential gap between each protrusion 10 serves as a liquid flow path 15.

The movable contact 14 is urged by the spring 13 from the spring seat 8 side to the upstream side, and when the liquid does not flow within the liquid flow detection switch l, the movable contact 14 contacts the washer through +9;
The liquid flow hole 7 is shielded. Note that the spring constant of the I'iii retaining member 13 is selected in advance so that it will elastically contract only after the required dynamic pressure is generated to properly flow through the pipe, as will be described later.

With this configuration, the conduction seat 6 and the movable contact 14 constitute a switching element that performs an electrical switching function, which will be described later, and the movable contact 14 is electrically connected to the spring seat 8 via the spring 13. do.

The liquid flow detection switch l having such a configuration has screw parts 5a and 5b.
The tubes 20a and 20b are screwed together and inserted into the conduit 21. Then, necessary connections are made to the guide washer 6 and the spring seat 8. For example, as shown in FIG. 1, the spring washer 8 is connected to the ground via the lead wire 22, the other conductive seat 6 is set as the output side, and the resistor 24 and the light emitting diode are connected to the special washer 6 via the lead wire 23. 25 or 7 reporting devices such as buzzers and relays are connected. Alternatively, as shown in FIG. 2, it may be connected to a central control unit CPU or the like to operate various crisis management mechanisms or control devices in response to an abnormal occurrence of liquid flow.

With this configuration, when there is a flow of liquid at a predetermined pressure in the pipe 21, the dynamic pressure causes the movable contact 1 to move as shown in FIG.
4 is pushed downstream against the spring 13, the liquid flow hole 7 is opened, the liquid bypasses the movable contact 14, flows through the liquid flow path 15, and flows through the liquid flow hole 9 of the spring seat 8. pass through. In this state, the movable contact 14 is separated from the conduction seat 6, a flowing liquid is interposed between the conduction seat 6 and the movable contact 14, the electrical resistance between them becomes infinite, and the liquid flow detection switch l is turned off. state, and one light emitting diode 25 does not emit light.

On the other hand, the liquid may not flow at the predetermined pressure due to blockage of the pipe line or malfunction of the pump. In such a case, the liquid has no force to push out the movable contact 14 against the spring 13, and the movable contact 14 comes into contact with the conductive seat 6, as shown in FIG. and the movable contact 14 are electrically connected, and the liquid flow detection switching element is closed. Therefore, conduction is established between the conduction seat 6 and the spring seat 8 via the liquid flow detection switch 1, and the light emitting diode 25 emits light.
The occurrence of an abnormal situation will be notified from the driver's seat, etc. Alternatively, the central control unit CPU will generate various control signals in response to such a situation.

In the embodiment described above, the movable contact 14 also controls the opening and closing of the liquid flow hole 7, and when a dynamic pressure greater than the biasing pressure of the spring 13 is not applied, the liquid flow is cut off, thereby also serving as a pressure control valve. This is why it is highly useful.

On the other hand, since the present invention controls the electrical connection and disconnection of the conductive seat 6 and the spring seat 8 by the dynamic pressure of the liquid, the movable contact 14 is separated from the conductive seat 6 by receiving the dynamic pressure of the liquid. Even if the movable contact 14 is connected to the conduction seat 6, if the liquid flow does not need to be interrupted, for example, the structure around the conduction seat 6 may be used to ensure the flow of the liquid. A flow hole may be formed in the bypass pipe, or a liquid flow detection switch l may be provided in the bypass pipe.

Furthermore, the movable contactor 14 can have various shapes such as a conical shape, a cylindrical shape, a rectangular parallelepiped shape, etc. in addition to a spherical shape.

Further, in the above configuration, the spring seat 8 is made conductive, and the spring 13
electrically connected to the movable contactor 14 via the spring seat 8
However, as shown in Figure 4, the pipe 2
A spring seat 30 consisting of a locking step may be provided on the downstream side of 1, and the leads i and 'i31 may be connected to the conductive spring 13. Furthermore, if the spring is made of an insulating material, , a lead wire connection may be made directly to the movable contactor 14.

[Effects of the Invention] As described above, the present invention configures a liquid flow detection switching element with a conduction seat and a movable contact in a conduit, and drives a reporting device etc. by the action of the liquid flow detection switching element. or f! ! Since it is designed to trigger various control functions, it has a simple mechanical configuration and is simple in structure, and can prepare for abnormal situations without visually inspecting the liquid path. By being used for engine oil supply pipes in engines and oil supply pipes for various other machine tools, it has excellent effects such as ensuring smooth operation and work.

[Brief explanation of the drawing]

The accompanying drawings show embodiments of the present invention, in which FIG. 1 is a vertical side view in a normal state, FIG. 2 is a vertical side view in an abnormal state, FIG. 3 is a cross-sectional view taken along line A-A in FIG. The figure is a longitudinal sectional side view of a modified example. l...Liquid flow detection switch 2...Insulating holder 6...Conduction seat 8...Spring seat 7.9...Liquid flow hole 13...Spring 14...Movable contact 15.・Liquid flow path 21 ・Pipe line 25 ・Light emitting guide 30 ・Spring seat diagram 1 5 3 5 0 3 4

Claims (1)

[Claims] A spring seat is arranged on the downstream side and a conductive seat is arranged on the upstream side, spaced apart in the flow direction in the pipe, and a spring and a conductive movable contact are sequentially arranged from the downstream side between the seats. The spring urges the movable contact so that it can come into contact with the upstream conductive seat, and the spring constant of the spring is changed so that the movable contact is retracted by the generation of the required hydraulic pressure and the contact with the upstream conductive seat is released. A liquid flow detection switching element for conduits is constructed by setting the movable contact and the conductive seat to act as a biasing force, and a liquid flow detection switching element is formed between the movable contact and the conductive seat, and the required electrical connection is made between the movable contact and the conductive seat. Device.