KR200307880Y1 - Raw material level detection device in confined space - Google Patents

Abstract

In the raw material level detection device is provided on the upper side of the one side of the raw material hopper 110 which is a sealed space that can receive and discharge the raw material 120,

A hollow body 10 having a vertical through hole 14 penetrated in a direction perpendicular to the lower wall 12; and

It is formed on the upper end of the support rod 20 is fitted to the vertical weight hole (14) by being fitted to the vertical through hole (14) to be pivotable at a lower end, and the lower surface is in close contact with the lower wall (12) And an air flow differential unit 30 which blocks the flow and forms an air purge hole 32 connecting the inner space of the body 10 and the inner surface side of the air purge hole 32.

The pressure detecting sensor 58 is mounted on the pressure supply pipe 50 provided with the non-return valve 52 and the opening / closing valve 54 to supply compressed air to the body 10 to detect the pressure and change the pressure. A raw material level detection device in an enclosed space, characterized by measuring the level of raw materials.

Description

Raw material level detection device in confined space

The present invention relates to a device for detecting a raw material level in a confined space in which dust, moisture, and toxic gas are present. More specifically, it is possible to remove the malfunction factors such as dust sticking and water penetration, thereby providing more accurate and stable level measurement. The present invention relates to a raw material level detection device in an enclosed space.

In general, a large amount of dust, moisture, and toxic gas are present in an airtight space such as a hopper, which is installed in a raw material plant, a coke plant, a pulverized coal facility, etc., to store raw materials therein. Maintaining below the set height is very important in terms of safety of facility accident prevention. For this purpose, the raw material level in the sealed space must be detected at all times, and the raw material level detecting device plays a role.

1 shows a schematic configuration in which a conventional raw material level detection device is mounted in a raw material hopper, and a conventional raw material hopper 110 forms a raw material inlet 112 for injecting raw materials to the upper side and supplies the raw materials to the lower side. A raw material outlet 114 for discharging is formed, and the raw material inlet 112 and the raw material outlet 114 are provided with seal valves 113 and 115, respectively, if necessary, the raw material inlet 112 and the raw material outlet ( 114) can be opened and closed. The level information of the raw material 120 which is put into and stacked in the raw material hopper 110 is an important factor in determining the raw material discharge and the raw material input time. Therefore, a detection device for detecting the raw material level is provided on one side of the raw material hopper 110. Is installed.

One prior art for the raw material level detection device is to use a capacitive sensor (Overflow Sensor) 200, which is the detection main body 210 is one side of the raw material hopper 110 as schematically shown in FIG. It is fixed to the upper portion, the upper end of the rotating rod 220 is rotatably connected to the detection main body 210, by mounting the weight 230 in the lower end of the rotating rod 220, the raw material 120 is constant By stacking the weight 230 by pushing the weight 230 to rotate the rotating rod 220 is to detect that the raw material is stacked up to the set height in the detection base body 210.

The other one of the prior art uses the electrode type sensor 300, which is the electrode 310, 320 having a different height of the lower detection end 312, 322, 332 as schematically shown in FIG. When a plurality of 330s are provided and the raw material level reaches the position of the solid line 341 and contacts the detection end 312 at the lower end of one electrode 310, no signal is generated, but the raw material level is one point. When the position of the dashed line 342 is reached to contact both the detection ends 312 and 322 at the lower ends of the two electrodes 310 and 320, a current flows between the electrodes 310 and 320 and the raw material level is increased. When a signal (for example, a signal at a LOW level) occurs between the detection stages 312 and 322 is generated, the first warning state occurs, and the raw material level is located at the position of the advantage chain line 343 in the same manner. Will also be detected.

Another one of the prior art is to use the torque detection sensor 400, which is equipped with a rotary blade 420 at the lower end of the support rod 410 extending from the raw material hopper 110 to a predetermined internal height, and thus the raw material When the level is higher than the position where the rotary blade 420 is mounted, the rotation of the rotary blade 420 is stopped, it can be seen that the raw material level has risen to the set position by detecting this.

However, these conventional methods do not consider the dust and moisture, etc., in the case of the capacitive sensor 200 is rotated by the dust is fixed to the connection portion of the detection base 210 and the rotating rod 220 Of course, there is a problem that the rotation of the rod 220 is not made properly, and the moisture penetrates into the detection main body 210 through the connection part and prevents the electrical contact from operating normally. In this case, the same problems as in the case of the capacitive sensor 200 are caused by moisture penetrating into the detection main body through the connection portions of the electrodes 310, 320, 330 and the detection main body (not shown). Even in the case of the detection sensor 400, the inoperable state is caused by the dust and moisture that is stuck around the rotary blade 420.

Due to this problem, the raw material level in the sealed space in which dust and moisture, etc. are not accurately detected, leading to a problem that the subsequent process is not normally performed because the timing of discharge and supply of raw materials is not properly understood.

The present invention has been devised to solve such a conventional problem, and its purpose is to provide a raw material in an enclosed space that can stably and accurately detect the level of a raw material filled in an enclosed space in which dust and moisture exist. It is to provide a level detection device.

1 is a schematic configuration diagram showing a raw material hopper equipped with one of the conventional raw material level detecting devices.

2 is a schematic configuration diagram showing another one of the conventional raw material level detection device;

Figure 3 is a schematic configuration diagram showing another one of the conventional raw material level detection device

4 is a schematic configuration diagram showing an apparatus for detecting a raw material level in an enclosed space according to the present invention;

Figure 5 is a main part of the present invention

Figure 6 is a cross-sectional view showing in detail the air purge hole portion of the subject innovation

7 is a detailed view of the main portion of the raw material level detection apparatus according to another embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

10 ... body

12 ... bottom wall

14 ... vertical through hole

20 ... support rod

22 ... weight

30 ... Airflow Vehicles

32 ... air purge hole

40 ... safety valve

The present invention as a technical configuration for achieving the above object,

In the raw material level detection device is provided on the upper side of the one side of the raw material hopper which is a sealed space that can receive and discharge the raw material,

A hollow body having a vertical through-hole penetrated in a direction perpendicular to the lower wall; and,

It is formed on the upper end of the support rod that is fitted to the vertical weight through the lower weight through the vertical through-hole, and the lower surface is in close contact with the lower wall to block the flow of air, the internal space and the purge of the body And an air flow difference unit forming an air purge hole for connecting the hole inner surface side.

The raw material level in the sealed space, characterized in that the pressure detection sensor is mounted on the pressure supply pipe to supply the compressed air to the body with the non-return valve and the on-off valve to detect the pressure and measure the level of the raw material by the pressure change. By providing a detection device.

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Figure 4 is a schematic view showing a raw material level detection device in a confined space according to the present invention, a hollow body (10) coupled via a bolt member and a packing member not shown on the upper side of the raw material inlet 112 ) And one or more vertical through holes 14 penetrating up and down are formed on the lower wall 12 of the body 10, and having a proper length through the vertical through holes 14. 20 is fitted, the air flow difference unit 30 having a size that can block the air flow through the vertical through hole 14 is integrally formed at the upper end of the support rod 20 of the lower wall 12 It is placed on the top surface.

In addition, the weight 22 having a proper size and mass is fixed to the lower end of the support rod 20 so that the weight of the weight 22 is applied to the air flow difference unit 30 through the support rod 20. The air flow difference unit 30 is kept in close contact with the upper surface of the lower wall 12 at the appropriate pressure.

In addition, the air purge hole 32 is formed in the central portion of the air flow difference unit 30 extends to the vertical through hole 14 side through the support rod 20, so that the outside of the inside of the body 10 Forming a pressure slightly larger than the pressure allows the internal air to be discharged to the vertical through hole 14 through the air purge hole 32.

The above structure is shown in more detail in FIG. 5, in which the size of the vertical through hole 14 is larger than that of the support rod 20 so that the rotation of the support rod 20 can be smoothly performed. It can be seen that, if the support rod 20 is in a vertical state in order to maintain a more stable sealing action between the air flow difference unit 30 and the lower wall 12, the vertical through hole 14 ) Is formed in the extension protrusions 13 which are bent upwards to the lower wall 12 and are formed. In this case, the air flow difference is provided in the receiving groove 34 in which the extension protrusions 13 can be accommodated. It is preferable to form in the lower surface of the single body 30. In addition, when the support rod 20 is rotated to be excessively rotated to install a safety plate 40 fixed to the body 10 by a suitable distance to the upper portion of the lower wall 12 in order to return to the initial position, The safety plate 40 is formed with a plurality of air passage holes 42 so as not to interfere with the up and down flow of the air inside the body (10). That is, since the safety plate 40 is installed in a position that may interfere with the rotational motion of the path formed by the air flow car body 30 as it rotates, the air flow car body 30 is no longer rotated to an appropriate angle. It may be made more stable to return to the initial position because it is not rotated.

In addition, it is preferable that the air purge hole 32 is divided into a plurality in the vertical through-hole 14 side, and the branch hole 33 is formed radially in the direction of the outside of the support rod 20. It is desirable to form a downward slope toward the surface portion. The branch holes 33 are formed in an arc shape as shown in FIG. 6 along the outer circumferential surface of the support rod 20 through the space between the outer surface of the support rod 20 and the vertical through hole 14. It is preferable to form a swirling flow that flows effectively to purge dust and moisture.

FIG. 7 shows that the air flow difference mechanism 30 'may be slightly deformed with respect to the air flow difference mechanism 30 as the first embodiment. In this air flow difference structure 30', the accommodation groove is shown. By forming a projection 36 which protrudes a predetermined length downward in a downward direction more than 34, and forming a groove 15 corresponding to the projection 36 on the upper surface of the lower wall 12 ', When the groove 20 rotates, the groove 15 can be a rotational center point.

The device of the present invention is provided with a means for supplying a pressure inside the body 10, as shown in Figure 4, the pressure supply pipe 50 is connected to the body 10, the pressure supply pipe 50 A check valve 52 for preventing the pressure inside the body 10 from flowing back through the pressure supply pipe 50 and an opening / closing valve capable of opening and closing the flow of air supplied through the pressure supply pipe 50 ( 54 is provided, the withdrawal pipe 56 withdrawn from the pressure supply pipe 50 is equipped with a pressure sensor 58 that can detect the pressure change of the pressure supply pipe (50). Of course, the outlet pipe 56 is provided with a shutoff valve (59).

Compressed air is supplied through the pressure supply pipe 50 to maintain a constant pressure at all times in the body 10 of the present invention having the above configuration, and the pressure inside the body 10 thus formed is a closed space, that is, the body ( It should be larger than the external pressure of 10).

When the raw material level in the confined space is below the set height, no external force is applied to the weight weight 22 so that the air flow difference unit 30 is kept in a horizontal state, and thus is appropriate to the upper surface of the lower wall 12. It is kept in close contact with pressure.

In this state, the air inside the body 10 is discharged into the space between the vertical through hole 14 and the support rod 20 through the air purge hole 32 and the branch hole 33 branched therefrom, and thus vertical through. Dust and moisture, which may exist in the space between the ball 14 and the support rod 20, may be purged to the outside, which may be minutely formed between the air flow difference unit 30 and the lower wall 12. It is possible to effectively prevent dust and moisture from being introduced into the body 10 through the gap, and at the same time, the dust and moisture are fixed around the space.

When the raw material level in the confined space rises above the set height, the external force is applied to the weight weight 22 by the raw material, possibly raising the weight weight 22 or turning as shown by the dashed-dotted line in FIG. I will. In all these cases, a relatively large air discharge space is formed between the air flow difference unit 30 and the lower wall 12 which are in close contact with each other, and thus the pressure inside the body 10 is rapidly increased. To be degraded.

This pressure change can be detected by the pressure sensor 58 through the pressure supply pipe 50 and the outlet pipe 56, so that the raw material level is measured.

Of course, when the raw material level in the closed space is discharged and the material level falls below the set value, the external force caused by the raw material applied to the weight weight 22 is removed, so that the weight weight 22 returns to the initial position and the air flows. The blocking body 30 is again in close contact with the lower wall 12 to wait for the next level detection operation while allowing only the discharge of air through the air purge hole 32.

As described above, according to the raw material level detection device in the sealed space according to the present invention, when the level of the raw material in the sealed space is measured, dust and water are effectively prevented from penetrating into the level measuring device and stuck to the periphery thereof, thereby reducing the operation performance of the device. To ensure.

Claims (1)

In the raw material level detection device is provided on the upper side of the one side of the raw material hopper 110 which is a sealed space that can receive and discharge the raw material 120, A hollow body 10 having a vertical through hole 14 penetrated in a direction perpendicular to the lower wall 12; and It is formed on the upper end of the support rod 20 is fitted to the vertical weight hole (14) by being fitted to the vertical through hole (14) to be pivotable at a lower end, and the lower surface is in close contact with the lower wall (12) And an air flow differential unit 30 which blocks the flow and forms an air purge hole 32 connecting the inner space of the body 10 and the inner surface side of the air purge hole 32. The pressure detecting sensor 58 is mounted on the pressure supply pipe 50 provided with the non-return valve 52 and the opening / closing valve 54 to supply compressed air to the body 10 to detect the pressure and change the pressure. A raw material level detection device in an enclosed space, characterized by measuring the level of raw materials.