JP4533368B2 - Oil mist detection system - Google Patents

Description

  The present invention relates to a useful oil mist detection system capable of stably detecting oil mist (oil mist) without being affected by raw oil or dirt on the inner wall of a pipe part.

  Oil mist is generally used for oil mist lubrication and semi-dry processing. As an example of a method for detecting oil mist, oil mist passing through a translucent tube is irradiated with light. Scattered light is detected and measured.

Conventionally, as such an oil mist detection system, for example, a tubular body that becomes a spray-like oil mist conveyance line, an issuing element that illuminates the inside of the tubular body, a light receiving element that receives irradiation light, and a change in received light amount A sensor detection unit (light detection means) for detecting the presence or absence of oil mist, and a main body case for housing the tubular body and the sensor detection unit (light detection means). While supporting the translucent internal tube as the said tubular body, the said detection means has arrange | positioned the said light emitting element and a light receiving element outside this translucent internal tube (for example, refer patent document 1).
Japanese Patent Laid-Open No. 10-47591

  However, in the conventional oil mist detection system as described above, electrical processing such as re-adjusting the facing angle between the light-emitting element and the light-receiving element that applies light to the passing oil mist, and adjusting the threshold and sensitivity of the light amount However, if non-misted oil (raw oil) flows through the translucent tube (tube body) or the inner wall surface of the translucent tube is dirty, the sensor detection unit (light Detection by the detection means) becomes impossible, and as a result, detection may become impossible.

  In other words, when oil mist is caused to flow in the pipe, the oil mist is wetted (raw oil) in the pipe due to the flow rate in the pipe and the shape of the pipe. However, since it interferes with the sensor that detects oil mist in the piping, it cannot be detected normally, and it cannot be used for a long time. There is a problem that adjustment and work are time-consuming, for example, adjustment is required.

  The present invention has been made in view of such problems, and a useful oil mist detection system capable of stably detecting oil mist (oil mist) without being affected by raw oil or dirt on the inner wall of a pipe. It is intended to provide.

In order to achieve the above object, the gist of the oil mist detection system according to the present invention is to receive a tubular body of a translucent tube serving as an oil mist conveying line, a light emitting element for illuminating the tubular body, and receiving irradiation light. And an oil mist detection system for detecting the presence or absence of oil mist in the tube from the change in the amount of received light, and providing the sensor detection unit on the outlet side of the tube, In order to prevent the adverse effect of the raw oil from appearing on the sensor detection unit, a spiral protrusion or a spiral concave groove from which the raw oil flows out is provided on the inner peripheral wall surface of the tubular body.

  As described above, in the oil mist detection system of the present invention, an air inflow port is provided on the upstream side of the sensor detection unit, and compressed air having a high flow rate is detected by a pressure higher than the pressure of the wall of the tubular body. By supplying to, it is possible to flow the oil (raw oil) other than the dirt substance and oil mist in the detection section downstream or discharge it to the outside, so that the wall surface of the inside of the tube such as a translucent tube is prevented. As a result, the problem that the mist cannot be detected due to the inflow of raw oil as in the prior art can be solved.

  Furthermore, by providing a guide groove (or protrusion) of an oil flow path formed of a linear or spiral groove or protrusion on the inner wall surface of the tube constituting the sensor detection section, a tube such as a translucent tube is provided. Since the oil (raw oil) that has not been misted inside the body can be controlled to flow along the guide groove (or projection), the adverse effect of the raw oil can be prevented without using a bypass pipe. There is an effect.

  In the upstream oil mist conveyance process, an air inlet is provided upstream of the sensor detection unit, and compressed air having a high flow rate is supplied to the sensor detection unit by a pressure higher than the pressure of the tubular body wall. Equipped with a flushing mechanism to push the generated (wet-out) raw oil downstream from the sensor detection unit, or to provide a bypass pipe so as not to send unmisted oil (raw oil) to the sensor detection unit, As a result, oil (raw oil) that has not been misted by providing guide grooves or protrusions through which oil (raw oil) flows is provided on the inner wall surface of a tubular body such as a translucent tube that constitutes the sensor detection unit. It is good to control not to send to the detection part.

  Hereinafter, a first embodiment of the present invention will be described with reference to FIG. In the figure, A is an oil mist detection system according to the present invention, and this oil mist detection system A sends fog in series from the fog IN1 side to the OUT7 through the valve body 3, the sensor detection unit 4, and the valve body 5. It is communicated as possible.

  The valve bodies 3 and 5 are, for example, a flushing solenoid valve (three-way solenoid valve), and when the signal of the sensor detection unit 4 is unstable or when there is no pressure / flow rate on the fog IN1 side (when operation is stopped). When the electromagnetic valve is turned on, the high-pressure air passes through the sensor detection unit 4 and is flushed to the drain OUT7a (flushing mechanism).

  Further, a valve with a reverse check may be used as the valve body 3. In this case, the valve is opened when the pressure on the fog IN 1 side disappears, and high-pressure air is generated through the sensor detection unit 4 and the valve body 5. You may comprise so that oil can be flushed out of the system from drain OUT7a. Further, an exhaust cleaner (not shown) may be installed on the drain OUT7a to exhaust the air.

  In addition, when the flow resistance of the mist conveyance line on the downstream side of the sensor detection unit 4 is small and the flow rate of the flushing air passing through the sensor detection unit is sufficiently high, the flushing air is directly sent to the OUT 7 via the valve body 5. You can also.

  Next, a second embodiment of the present invention will be described with reference to the drawings. In order to facilitate understanding, the same parts as those in the first embodiment described above are denoted by the same reference numerals, and only parts having different configurations will be described with new numbers.

  In FIG. 2, a bypass pipe 8 is provided so that raw oil is not fed to the sensor detection unit 4. The bypass pipe 8 feeds raw oil from the part (I) 2 to the part (III) 6 through the part (II) 9, and the part (II) 9 includes a pump type, a differential pressure type, A self-falling type is exemplified, and raw oil is controlled and fed to the component (III) 6.

  The flushing mechanism may be incorporated in the component (I) 2, the component (III) 6 or the sensor detection unit 4 and integrated.

  Next, a third embodiment of the present invention will be described with reference to the drawings. In order to facilitate understanding, the same parts as those in the first and second embodiments described above are denoted by the same reference numerals, and only different parts having different configurations will be described with new numbers.

  In FIG. 3A, reference numeral 10 denotes a transparent tube body such as a glass tube. On the OUT side of the tube body 10, an LED 11 constituting the sensor detection unit 4 is provided outside in the radial direction of the tube body 10. ing.

  Further, a piston pipe 15 that is slidably moved in the pipe body 10 via a cylinder 12 is assembled on the IN side of the pipe body 10. A wiper ring 15 a is integrally disposed at the tip of the piston tube 15.

  Further, the piston tube 15 is provided with a permanent magnet 13 on the IN side, and an O-ring 14 is externally provided near the tip on the OUT side.

  In FIG. 3B, reference numeral 12 a denotes a motor that moves the piston tube 15 slidably with respect to the tube body 10 via a pinion 17 that meshes with the rack 16.

  In FIG. 3C, reference numeral 18 denotes a ball screw. The ball screw 18 is rotated in the forward and reverse directions by the motor 12a, so that the piston tube 15 is slidably moved with respect to the tube body 10.

  Next, a fourth embodiment of the present invention will be described with reference to the drawings. In order to facilitate understanding, the same parts as those in the above-described embodiment are denoted by the same reference numerals, and only parts having different configurations will be described with new numbers.

  In FIG. 4A, reference numeral 19 denotes a translucent tube (tubular body), and a spiral groove 20 is formed in the inner wall surface. The spiral groove 20 controls the flow of the raw oil 22 (see FIG. 4C) that flows along the inner wall surface of the translucent tube 19 of the sensor detection unit 4 of the oil mist. It is devised so that the part 4 is not affected.

  Further, as shown in FIG. 4B, a spiral protrusion 21 is provided in place of the groove 20 so that the flow of the raw oil 22 flowing along the inner wall surface of the translucent tube 19 can be controlled. You may comprise.

  Further, when the sensor detection unit 4 is installed and used in a horizontal state, as shown in FIG. 4D, the inner wall surface on the IN side of the translucent tube 19 in which the linear groove 23 is recessed. Alternatively, the guide tube 24 may be mounted so that the slit 25 of the guide tube 24 is positioned in the linear groove 23. In this case, it is necessary to attach and use the sensor detection unit 4 so that the linear groove 23 provided in the light transmissive tube 19 is positioned at the lowest point of the cross section of the light transmissive tube 19.

  In addition, this invention is not limited to a present Example, A design can be freely changed within the range of the objective of this invention, and this invention includes all of them.

  For example, in this embodiment, in order to remove dirt in the pipe body 10 due to raw oil, compressed air having a high flow rate is supplied to the sensor detection unit 4 by a pressure higher than the pressure of the inner wall portion. Without being limited thereto, the inside of the tube body 10 may be periodically cleaned with a wiper (not shown) or the like.

It is explanatory drawing which shows 1st Example of the oil mist detection system of this invention. It is explanatory drawing which shows 2nd Example of the oil mist detection system. It is explanatory drawing which shows 3rd Example of the oil mist detection system. It is explanatory drawing which shows 4th Example of the oil mist detection system.

Explanation of symbols

1 Fog IN
1a Air IN
2 Parts (I)
3 Valve body 4 Sensor detector
5 Disc
6 Parts (III)
7 OUT
7a Drain OUT
8 Bypass pipe 9 Parts (II)
10 Transparent tube 11 LED
12 cylinder 12a motor 13 permanent magnet 14 O-ring 15 piston pipe 15a wiper ring 16 rack 17 pinion 18 ball screw
19 Transparency tube (pipe)
20 Groove portion 21 Protrusion portion 22 Raw oil 23 Linear groove 24 Guide tube 25 Slit

Claims (1)

A translucent tube tube serving as an oil mist conveyance line, and a sensor detection unit having a light emitting element for illuminating the light tube and a light receiving element for receiving the irradiation light, and the tube body from the change in the amount of received light In the oil mist detection system that detects the presence or absence of oil mist,
A spiral projection that flows through the inner peripheral wall surface of the tube so that the sensor detection unit is provided on the outlet side of the tube and the sensor detection unit is not adversely affected by the raw oil, Or, provided a spiral concave groove,
Oil mist detection system characterized by

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