KR101153901B1 - Oil mist detecting apparatus - Google Patents

Abstract

The present invention is to detect the oil mist formed by the lubricating oil is heated under abnormal operating conditions in the internal combustion engine, more specifically, the scattering light generated by the light emitted from the light emitting means hit the oil mist in the light receiving means A light scattering oil mist detection device comprising: a control box having a main board assembly mounted therein; A first screw portion formed on an outer circumferential surface of the hollow cylindrical body as coupled to the control box, a second screw portion formed on an extension portion of the body, a core wall partitioning the hollow portion inside and outside the body, and as long as the core wall is formed. A barrel body comprising a pair of optical means insertion openings and a partition partition wall protruding toward a distal end from a core wall between the pair of optical means insertion openings; A barrel having an opening at one end thereof connected to the front end of the barrel body and having a barrel inlet formed at a protruding end stepped on the outer circumferential surface of the hollow cylindrical body, and having a barrel inlet formed on the opened one outer end surface; A barrel upper cover which has an arc-shaped body as coupled to the upper portion of the barrel, and an upper cover inlet hole is formed in a body portion which does not overlap the barrel inlet hole; A barrel lower cover having an arc-shaped body as coupled to a lower portion of the barrel, and having a lower cover inlet hole formed in a body portion which does not overlap the barrel inlet hole; It relates to an oil mist detection apparatus comprising a.

Description

Oil mist detecting apparatus

The present invention relates to an oil mist detecting apparatus capable of detecting an oil mist formed by heating lubricating oil under abnormal operating conditions in an internal combustion engine.

If the oil mist formed in the internal combustion engine increases rapidly, it may cause an accident that the engine will explode. Therefore, it is necessary to properly manage the amount of oil mist, and many oil mist detection devices have been proposed for this purpose.

Representatively there is a "oil mist detection device" of Korean Patent Registration No. 733255, attached to Figure 1 is a perspective view of the oil mist detection device according to it, Figure 2 is a cross-sectional view showing the internal structure and Figure 3 is a cross-sectional view showing the structure of the wall to be.

As shown, the prior art is to detect the oil mist in a light scattering manner, which is largely divided into a control unit and a detection unit, the detection unit is provided with a light emitting means and a light receiving means and the refraction means (41, 42) is disposed ahead of the Subsequently, the light transmission window W is formed.

In particular, in the prior art, the wall 62 into which the oil mist flows is characterized by a double wall structure of the inner wall 63 and the outer wall 64 having a gap. An inner wall through hole 8 and an outer wall through hole 7 for introducing an oil mist into different positions of the inner wall 63 and the outer wall 64 are formed.

In addition, in the prior art, an inflow preventing wall is further provided between the outer wall through hole 7 and the inner wall through hole 8 to prevent oil droplets intruding from the outer wall through hole from entering the inner wall through hole.

As described above, the conventional art has a problem in that the oil mist flows into a double wall structure, and an inflow preventing wall is formed in the complex structure.

In the related art, since the two refraction means 41 and 42 are integrally coupled with the light blocking member 44 interposed therebetween, there is a problem that no light is shielded against the outer surface of each refraction means. There is a problem that the assembly is also bad because the 44 and the refractive means to be bonded.

In addition, since the light transmission window W disposed in front of the refraction means is the same as one glass, part of the light generated from the light emitting means may affect the light receiving means, which may cause an error in the detection of the oil mist. there was.

In addition, there was a problem that the stable installation is not guaranteed even when the light emitting means and the light receiving means are installed in the detection unit, and there is a problem in assembly discomfort and structural stability even when connecting the detection unit to the control unit.

Registered Patent No. 073255 "Oil Mist Detection Device" Patent Publication No. 10-2008-0058181 "Oil Mist Detection Device"

Therefore, the present invention is to provide an oil mist detection apparatus that can solve the problems of the prior art as described above, having a simpler structure and does not cause a problem in the structural stability when installed in the engine generating a lot of vibration.

In addition, another object of the present invention is to provide an oil mist detection device having a characteristic of detaching a lens so as to more accurately detect the amount of oil mist, and shielding the outer surface of the lens and having excellent assembly properties.

In order to solve the above problems, in the present invention, in the light scattering type oil mist detection device for detecting the scattered light generated by the light emitting means hit the oil mist in the light receiving means, the control equipped with a main board assembly therein box; A first screw portion formed on an outer circumferential surface of the hollow cylindrical body as coupled to the control box, a second screw portion formed on an extension portion of the body, a core wall partitioning the hollow portion inside and outside the body, and as long as the core wall is formed. A barrel body comprising a pair of optical means insertion openings and a partition partition wall protruding toward a distal end from a core wall between the pair of optical means insertion openings; A barrel having an opening at one end thereof connected to the front end of the barrel body and having a barrel inlet formed at a protruding end stepped on the outer circumferential surface of the hollow cylindrical body, and having a barrel inlet formed on the opened one outer end surface; A barrel upper cover which has an arc-shaped body as coupled to the upper portion of the barrel, and an upper cover inlet hole is formed in a body portion which does not overlap the barrel inlet hole; A barrel lower cover having an arc-shaped body as coupled to a lower portion of the barrel, and having a lower cover inlet hole formed in a body portion which does not overlap the barrel inlet hole; Provided is an oil mist detection apparatus, characterized in that comprising a.

Here, the first lower cover inlet hole is preferably formed in an arc shape so as to have a length of an arc of a semicircle or more in the central portion of the barrel lower cover body.

In this case, a second lower cover inlet hole having a shorter length of the through hole than the first lower cover inlet hole is formed at the front end of the front lower barrel inlet hole of the first lower cover inlet hole, and is located behind the first lower cover inlet hole. In the side barrel lower cover, a third lower cover inlet hole having a shorter length of the through hole than the first lower cover inlet hole may be formed adjacent to the first lower cover inlet hole.

The upper cover inlet hole may be a pair of parallel arc-shaped through holes penetrating the outer peripheral surface of the body.

In addition, it is preferable that an oil stopper is formed on the outer circumferential surface between the protruding end of the barrel and the opening of the barrel-side opening.

A flange is integrally formed at the rear end side of the barrel body and a concave O-ring sheet is formed on the outer circumferential surface of the body between the flange and the first screw portion.

In addition, in the core wall of the inner diameter of the barrel body tip portion, the split lens is installed so that the opposing surfaces are blocked from each other by the partition partition wall, the shield cap surrounding the outer edge of the split lens, the protective window holder and the outer peripheral surface formed with the light emitting side and the light receiving side protection window Ensure that the protective window retainers, which are threaded, are inserted in sequence.

A protruding fixing pin is formed on the front surface of the blocking cap, and a pin hole to which the fixing pin is fitted is provided in the protective window holder to achieve an accurate coupling position, and to press the protective window holder in close contact with the blocking cap. It is preferable that a thread is formed on the inner diameter surface of the barrel body tip to allow the protective window retainer to be fastened.

The inside of the hollow cylindrical body of the barrel body, the sensor board assembly to be connected to the light emitting means and the light receiving means is formed at the front end, it is preferable that the sensor board assembly holder having a flange formed at the rear end is interpolated and fixed.

The oil mist detecting apparatus according to the present invention has an advantage of excellent structural stability even when installed in a place where vibration is severe, the structure of the barrel is relatively simple, and the oil mist and the light receiving side can be completely separated from each other. There is an effect to reduce the error of detection.

In addition, the oil mist detection device of the present invention is divided into a control box, a barrel body, a sensor board assembly holder, a barrel and a barrel top and bottom cover to assemble and separate the separate component parts to facilitate the installation, separation and maintenance of the product. There is an advantage.

1 is a perspective view of an "oil mist detection apparatus" according to the prior art.
Figure 2 is a cross-sectional view showing the internal structure of the oil mist detection apparatus according to the prior art.
3 is a cross-sectional view showing the structure of the wall of the oil mist detection apparatus in the prior art.
4 is an external perspective view and a plan view of the oil mist detection apparatus of the present invention.
FIG. 5 is a longitudinal sectional view of the oil mist detection device according to the cutting line 'A-A' of FIG.
Figure 6 is a cross-sectional view of the oil mist detection device according to the cutting line 'B-B' of FIG.
7 is an exploded perspective view of the oil mist detection apparatus of the present invention.
8 is a side view and a front view of the barrel body of the present invention.
9 is an external perspective view of the barrel of the present invention.
Figure 10 is an external perspective view of the barrel top cover of the present invention.
Figure 11 is an external perspective view, a plan sectional view and a side sectional view of the barrel lower cover of the present invention.

The oil mist detection apparatus according to the present invention will be described in more detail, but with reference to the accompanying drawings as a means to help understand the technical idea of the present invention. The drawings presented show one possible example according to the spirit of the present invention.

The oil mist detecting apparatus according to the present invention is capable of detecting the amount of oil mist generated by being inserted into a crankcase of an engine used in a place such as a ship, thereby rapidly increasing the amount of oil mist and thus causing the engine to explode. You can prevent it in advance. And the oil mist detection apparatus of the present invention is configured to detect the amount of oil mist in a light scattering manner.

Hereinafter, with reference to the accompanying drawings will be described in detail with respect to the spirit of the present invention.

4 is an external perspective view and a plan view of the oil mist detecting apparatus of the present invention, FIG. 5 is a longitudinal sectional view of the oil mist detecting apparatus according to the cutting line 'A-A' of FIG. 4, and FIG. Fig. 7 is a cross sectional view of the oil mist detecting apparatus according to B-B ', and Fig. 7 is an exploded perspective view of the oil mist detecting apparatus according to the present invention.

As shown, the oil mist detecting apparatus according to the present invention is provided with a control box 100 and a barrel body 200 is connected to the front of the control box 100 and installed at the front end of the barrel body 200. 300 is coupled, the barrel upper cover 410 and the barrel lower cover 420 is coupled to the upper and lower portions of the barrel 300.

The control box 100 has a main board assembly 120 that is electrically connected to the sensor board assembly 520 is connected to the light emitting means 501 and the light receiving means 502 to be described later, the cable connector ( 115) is formed.

In FIG. 5 and FIG. 6, reference numeral 110 denotes a case constituting the control box 100, and 111 denotes a case cover. A gasket 113 is mounted between the case 110 and the case cover 111. Reference numerals 112a and 112b denote bolts, and 114 denote caps for fixing the gasket 113. Reference numeral 414a in FIG. 4 denotes a bolt for coupling the barrel upper cover 410 to the barrel 300, reference numeral 512 in FIG. 5 denotes a screw, 216 denotes a nut, and 217 denotes an adhesive seal washer. Indicates.

8 is a side view and a front view of the barrel body of the present invention. The rear end of the barrel body 200 is coupled to the control box 100 through. The barrel body 200 is composed of a body (210) forming a cylindrical shape as a whole and a flange 211 integrally formed at the rear end of the body (210). The tip extension portion of the body 210 is formed to have a smaller diameter. A first screw portion 210a is formed on the outer circumferential surface of the large body, and a second screw portion 210b is formed on the outer circumferential surface of the small tip extension portion. In the case of the tip extension portion, a thread is formed on the inner circumferential surface, which is to be coupled to the outer circumferential surface of the protective window retainer 260 described later.

The O-ring sheet 215 for mounting the O-ring 215a is formed on the outer circumferential surface between the body 210 and the flange 211 on which the first screw portion 210a is formed.

A core wall 214 is formed at the inner diameter of the front end of the barrel body 210 to divide and partition the inner space of the hollow cylindrical body 210 back and forth, and the light means insertion holes 213a and 213b are formed therethrough. One of the light means insertion holes is a light emitting means insertion hole 213a for the light emitting means 501, and the other is a light receiving means insertion hole 213b. A plate-shaped partition partition 212 is formed in the space between the light emitting and light receiving means insertion holes 213a and 213b to protrude from the core wall 214 to the front end side of the body. This is to prevent the light from interfering with the opposite surface of the split lens 230 to be described later.

The barrel body 200 is coupled to the control box 100 by a bolt 117a through the fastening hole 211a of the flange 211.

As shown in FIGS. 4 and 5, the sensor board assembly holder 500 interpolates inside the barrel body 200. The sensor board assembly holder 500 is cylindrical, and a sensor board assembly 520 electrically connected to the light emitting means 501 and the light receiving means 502 is coupled to a front end thereof, and a flange 511 is formed at the rear end thereof. . In the drawings, reference numeral 512 denotes an electric wire cable.

The sensor board assembly holder 500 is coupled by a bolt 117b inside the rear end of the barrel body 200.

The light emitting means 501 and the light receiving means 502 are installed in the barrel body 200, and a part of the barrel body 200 and the barrel 300 are installed while being inserted into a crank case (not shown). As the light emitting means 501, light irradiation means such as an infrared LED is adopted, and as the light receiving means 502, a light receiving element such as a photo sensor may be selected.

As shown in FIG. 7, the split lens 230, the blocking cap 240, the protective window holder 250, and the protective window retainer 260 are inserted and mounted in the inner diameter of the front end of the barrel body 200.

9 is an external perspective view of the barrel of the present invention. The barrel 300 is screwed to the front end second screw portion 210b of the barrel body 200 by the barrel holder 320. The barrel holder 320 is fixed to the opening 310a side of the barrel 300. The thread is formed on the inner circumferential surface.

The barrel 300 has a plurality of barrel inlet holes (311, 312) is formed in the hollow cylindrical body 310 as a whole, the fastening hole for fastening the bolt with the upper and lower cover (410,420) to be described later on the outer peripheral surface of the body ) Is formed. On the outer circumferential surface biased toward the closed side end portion of the barrel body 310, the protruding end 315 is formed stepped, and a pair of elliptical barrel inlet holes 312 penetrating facing the protruding end 315 are formed. do. On the outer circumferential surface adjacent to the opening side of the body 310, a pair of circular barrel inlet holes 311 are formed to face each other. An oil barrier 314 is formed on an outer circumferential surface of the body 310 at the side of the circular barrel inlet hole 311. The oil blocking jaw 314 is to prevent the oil introduced on the outer circumferential surface of the barrel 300 from flowing into the barrel inlet hole 311. Reference numeral 313 denotes a locking step.

Since the barrel 300 has a plurality of barrel inlet holes 311 and 312, the oil mist generated inside the crankcase enters the barrel 300 through the barrel inlet holes 311 and 312 and in the light emitting means 501. The generated amount of the oil mist is measured by the amount of light generated by the light absorbing means 502 to absorb the light scattered by hitting the oil mist.

The barrel 300 has a cylindrical shape and has one open end connected to the front end of the barrel body 200 and the other end is closed. The barrel inlet holes 311 and 312 are holes penetrating the inside and the outside, and in this embodiment, the barrel inlet holes 311 and 312 are formed near the rear end and the front end of the barrel 300. Here, the rear end means the direction in which the opening is coupled to the barrel body and the front end means the closed end side.

The number or position of the inflow holes 311 and 312 in this embodiment is just one example, and the shape, size, and number of the inflow holes may be changed as much as possible.

The barrel inflow holes 311 and 312 provided in the barrel 300 exist so that the oil mist flows into the barrel to detect the amount of oil mist generated by the action of the light emitting means 501 and the light receiving means 502. . However, since the barrel inlet hole (311, 312) can enter not only fine oil mist particles but also oil droplets such as oil droplets other than the oil mist, it is necessary to block the flow into the barrel 300. If a substance other than oil mist enters the barrel, it will contaminate the barrel and reduce the accuracy of detection.

For this purpose, in the present invention, unlike the double wall structure adopted in the prior art, a plurality of covers 410 and 420 are prepared to cover each barrel inlet hole 311 and 312, and the oil mist is at least one direction in the barrel inlet hole 311 and 312. To be able to access

Fig. 10 is an external perspective view of the barrel upper cover of the present invention, and Fig. 11 is an external perspective view, a plan sectional view, and a side sectional view of the barrel lower cover of the present invention.

Barrel upper cover 410 and the barrel lower cover 420 is to form a pair to wrap the barrel 300 from the outside, the oil mist of scattering fine particles are introduced into the interior of the barrel 300, particles Oil of a large size does not flow into the barrel inlet hole (311, 312) inside the barrel (300).

The barrel upper cover 410 has a pair of top cover inlets 412 and 413 formed side by side on the outer circumferential surface of the arc-shaped body 411 having a semicircle or arc. The upper cover inflow holes 412 and 413 are formed at positions not overlapping with the barrel inflow holes 311 and 312 of the barrel 300 coupled downward as semi-circular or arc-shaped through holes. In the drawings, reference numeral 414 denotes a fastening hole.

Each of the upper cover inflow holes 412 and 413 allows the oil mist inside the barrel 300 to escape from the barrel 300, and blocks oil droplets splashing from the crankcase into the barrel. .

The barrel lower cover 420 has a plurality of lower cover inlet holes 422, 423, 424 formed on the outer circumferential surface of the arc-shaped body 421 having a semicircle or arc. The outer circumferential surface of the central portion of the body 421 is formed with an arc-shaped first lower cover inlet hole 422 having an elongated semicircle or an arc shape longer than a semicircle, and on both sides of the first lower cover inlet hole 422. Second and third lower cover inflow holes 423 and 424 having a long length of less than a semicircle are formed. The second lower cover inlet hole 423 is formed through the front end of the barrel lower cover 420, the third lower cover inlet hole 424 is adjacent to the first lower cover inlet hole 422 and behind it Is formed. Here, the rear means a portion coupled to the barrel body 200.

When the upper and lower barrels 410 and 420 are configured as described above, large oils falling from above are prevented from being introduced into the barrel, and the oil mist is smoothly introduced from the lower side of the barrel 300.

That is, the first lower cover inlet hole 422 is formed by extending the length of the through hole (the length of the arc of the through hole) in a semicircle or more arc shape and placing it in the center of the barrel lower cover 420 so as to be inside the crankcase. The oil splashing from the oil does not form an oil film on the periphery of the inside and outside of the first lower cover inlet hole 422, and the oil mist (oil vapor) generated inside the crankcase is well guided to the first lower cover inlet hole 422 and is a barrel. (300) to be introduced into the interior.

The second lower cover inlet hole 423 accumulates in the gap space between the inner circumferential surface of the barrel lower cover 420 and the outer circumferential surface of the closed tip of the barrel 300 so that an oil film is not generated. When the fried oil particles enter the barrel 300 or when condensation is generated on the inner circumferential surface of the barrel lower cover 420 when used for a long time, the oil droplets are discharged out.

The third lower cover inlet 424 is formed to have a shorter length of the through hole than the first lower cover inlet 422 adjacent to the arc-shaped first lower cover inlet 422. As to assist the function of the cover inlet hole 422 serves to prevent the formation of an oil film on the first lower cover inlet hole 422 and to quickly discharge oil accumulated on the inner circumferential surface of the barrel lower cover 420.

As described above, the oil mist detecting apparatus of the present invention surrounds the barrel inlet holes 311 and 312 by using the upper and lower detachable covers 410 and 420 so that only the oil mist can enter the barrel 300. Furthermore, in the present invention, the light emitting means 501 and the light receiving means 502 are installed inside the barrel body 200, and the split lens is also installed. Unlike the conventional technology, the light emitting means 501 and the light receiving means 502 are installed. Has a feature.

As described above, the sensor board assembly holder 500 in which the light emitting unit 501 and the light receiving unit 502 are installed is inserted into the hollow from the rear end of the barrel body 200. The light emitting means 501 and the light receiving means 502 are installed at the front end of the sensor board assembly holder 500. Preferably, the sensor board assembly 520 is formed on the front end of the sensor board assembly holder 500. The light emitting means 501 and the light receiving means 502 are directly connected to the sensor board assembly 520. Since the light emitting means 501 and the light receiving means 502 are installed while being coupled to the sensor board assembly holder 500 inserted into the barrel body 200, the light emitting means 501 and the light receiving means ( 502 can be stably held in place and also excellent in assembly. The light emitting means 501 and the light receiving means 502 may be utilized a variety of known LEDs and diodes, so that a detailed description thereof will be omitted.

The light generated by the light emitting means 501 enters the barrel 300 through the light emitting side protection window 240a through the light emitting side split lens 230a, and when the oil mist is present in the barrel 300. The light hits the oil mist and is scattered, and the scattered light enters the light receiving means 502 to detect the presence or absence of the oil mist through the amount of light received by the light receiving means.

In the present invention, a split lens 230 is used, each of which is divided into a light emitting side split lens 230a and a light receiving side split lens 230b. In the related art, two divided lenses are integrally bonded with an adhesive with a light blocking member interposed therebetween. However, in the present invention, the partition bulkhead 212 is formed at the inner center of the front end of the barrel body 200 so that the opposing surfaces of the two split lenses 230 may be blocked by the split partition wall 212. At the same time, each of the split lenses 230a and 230b is surrounded by the blocking cap 240 to prevent the light from leaking through the split lens outer part while holding the position of the split lens 230.

As will be described later, the protective window holder 250 is installed toward the front of the blocking cap 240, so that the mounting position of the protective window holder 250 can be easily determined while maintaining the position thereof. It is preferable to leave the fixing pin 241 to be. The pinhole 252 is formed in the opaque pad 251 to which the light emitting side and the light receiving side protection windows 250a and 250b are coupled to correspond to the fixing pin 241 of the blocking cap 240.

Since the two split lenses 230 are separated by the split partition 212 and the outer part is surrounded by the blocking cap 240 at the same time, the light incident on the two split lenses 230 does not affect any other split lenses. . That is, the light generated from the light emitting means 501 enters the light emitting side split lens 230a and then exits to the light emitting side protective window 250a installed in front of the blocking cap 240, and to the light receiving side split lens 230b. Light will not enter. In addition, the light entering the light-receiving side split lens 230b among the light scattered by the oil mist does not enter the light-emitting split lens 230a.

As mentioned above, the protective window holder 250 is positioned in front of the blocking cap 240 that surrounds the outer side of the split lens 230. The protective window holder 250 has an independent light emitting side unlike the prior art. The protective window 250a and the light receiving side protective window 250b are formed. More specifically, two holes are formed in the opaque pad 251 on the disc, and one protective window 250a or 250b is coupled to the hole. In addition, a pinhole 252 through which the fixing pin 241 may be inserted is provided at one surface of the opaque pad 251 in contact with the blocking cap 240 so that it is easier to find a position when assembling the protective windows 250a and 250b. After the assembly is made, the position of the protective window can be maintained without being disturbed.

Since the split lens 230, the blocking cap 240, and the protective window holder 250, which are installed in the barrel body 200, the inner diameter of the front end portion thereof, must maintain a constant position, in this embodiment, a ring-shaped screw for fixing them It is to use a protective window retainer (260). That is, to form a screw thread on the inner surface of the front end of the barrel body 200 and prepare and fasten the protective window retainer 260 corresponding thereto, the protective window retainer 260 is an opaque pad to which the protective windows 250a and 250b are coupled. In contact with the edge of the (251) is in a state to press, at the same time the protective window holder 250 is in a state to press the blocking cap 240 can be maintained a constant position. A thread is formed on the ring-shaped outer circumferential surface of the protective window retainer 260.

The sensor board assembly holder 500, the light emitting means 501, the light receiving means 502, the split lens 230, the protective windows 250a and 250b, and the protective window retainer 260 inside the barrel body 200. After coupling), etc., the barrel 300 is connected to the front end of the barrel body 200.

The oil mist detecting apparatus according to the present invention may be installed in various engines including ships, and thus may contribute to preventing explosion accidents caused by the surge of oil mist.

100: control box 120: motherboard assembly
200: barrel body 211: flange
212: partition bulkhead 214: core wall
230: split lens 240: blocking cap
250: protective window holder 250a, 250b: protective window
260: protective window retainer
300: barrel 311,312: barrel inlet
314: oil barrier 315: protrusion
410: barrel top cover 412,413: top cover inlet hole
420: barrel lower cover 422,423,424: lower cover inlet hole
500: sensor board assembly holder 501: light emitting means
502: light receiving means 520: sensor board assembly

Claims (9)

In the light scattering type oil mist detecting apparatus for detecting the scattered light generated by the light emitted from the light emitting means hit the oil mist,
A control box equipped with a main board assembly therein;
A first screw portion formed on an outer circumferential surface of the hollow cylindrical body as coupled to the control box, a second screw portion formed on an extension portion of the body, a core wall partitioning the hollow portion inside and outside the body, and as long as the core wall is formed. A barrel body comprising a pair of optical means insertion openings and a partition partition wall protruding toward a distal end from a core wall between the pair of optical means insertion openings;
A barrel having an opening at one end thereof connected to the front end of the barrel body and having a barrel inlet formed at a protruding end stepped on the outer circumferential surface of the hollow cylindrical body, and having a barrel inlet formed on the opened one outer end surface;
A barrel upper cover which has an arc-shaped body as coupled to the upper portion of the barrel, and an upper cover inlet hole is formed in a body portion which does not overlap the barrel inlet hole;
A barrel lower cover having an arc-shaped body as coupled to a lower portion of the barrel, and having a first lower cover inlet hole formed in a body portion which does not overlap with the barrel inlet hole;
Oil mist detection device, characterized in that comprising a. The method of claim 1,
The first lower cover inlet hole is an oil mist detection device, characterized in that formed in an arc shape so as to have a length of a semi-circle or more in the central portion of the barrel lower cover body. The method of claim 2,
A second lower cover inlet hole having a shorter length of the through hole than the first lower cover inlet hole is formed at the front end of the front lower barrel inlet hole of the first lower cover inlet hole, and a rear barrel of the first lower cover inlet hole is provided. The lower cover inlet hole having a shorter length of the through hole than the first lower cover inlet hole is formed in the lower cover adjacent to the first lower cover inlet hole. The method of claim 3,
The top cover inlet hole is an oil mist detection device, characterized in that a pair of parallel arc-shaped through hole penetrating the outer peripheral surface of the body. The method of claim 1,
Oil mist detection device, characterized in that the oil stopper is formed on the outer circumferential surface between the protruding end of the barrel and the opening of the barrel in the opening side. The method of claim 1,
An oil mist detecting apparatus according to claim 1, wherein a flange is integrally formed at a rear end of the barrel body, and a concave O-ring sheet is formed on an outer circumferential surface of the body between the flange and the first screw portion. 7. The method according to any one of claims 1 to 6,
In the core wall of the inner diameter of the barrel body tip, a split lens is formed so that the opposing surfaces are blocked from each other by a split partition wall, a blocking cap surrounding the outer portion of the split lens, a protective window holder and a protective window formed on the light emitting side and the light receiving side, and a screw thread on the outer peripheral surface. Oil mist detection device, characterized in that the protective window retainer is inserted in order to be formed. The method of claim 7, wherein
A protruding fixing pin is formed on the front surface of the blocking cap, and a pin hole to which the fixing pin is fitted is provided in the protective window holder to achieve an accurate coupling position, and to press the protective window holder in close contact with the blocking cap. Oil mist detection device, characterized in that the thread is formed on the inner diameter surface of the barrel body front end to the protective window retainer. The method of claim 1,
The oil mist detection, characterized in that the inside of the hollow cylindrical body of the barrel body, the sensor board assembly is connected to the light emitting means and the light receiving means at the front end, and the sensor board assembly holder is formed by inserting a flange at the rear end is inserted and fixed Device.

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