Pressure detection device for cyclone feeding pipe

Abstract

The utility model relates to the technical field of pressure detection, in particular to a pressure detection device for a cyclone feeding pipe. According to the utility model, the turbulent flow cover covers the outer side of the pressure measuring hole and filters the coal flow, so that coal particles in the coal flow can be effectively filtered out, the amount of the coal particles entering the pressure gauge in unit time is reduced, and the probability that the pressure measuring hole is blocked is reduced; meanwhile, the amount of coal particles attached to the pressure measuring elastic piece in unit time is reduced, and the single-time use time efficiency of the pressure gauge is prolonged. The incident flow surface of the turbulent flow cover is designed to be a non-permeable plate body, and the plate body is blocked at the front side of the pressure measuring hole, so that the speed of coal flow treated at the flow inlet of the pressure measuring hole is reduced, and the amount of coal particles entering the pressure gauge is further reduced. After the coal flow flows through the incident flow surface, the coal flow can flow along the back flow surface, and at the moment, some coal particles attached to the back flow surface can be separated from the back flow surface under the scouring action of the coal flow, so that the possibility that the filtering holes are blocked is reduced, the communication between the pressure gauge and the coal flow is kept, and the pressure measurement accuracy is kept.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure detection, in particular to a pressure detection device for a cyclone inlet pipe. Background Art

[0002] In the coal preparation process, it is usually necessary to detect the pressure of the cyclone feed pipe in real time to avoid the feed pipe from bursting due to excessive pressure. The commonly used detection method is to connect a pressure gauge to the feed pipe and use the pressure gauge to detect the pressure in the feed pipe in real time. Although the pressure in the feed pipe can be known by directly reading the value on the pressure gauge, there are still the following two problems in actual use:

[0003] 1. Larger coal particles in the coal flow will clog the pressure measuring hole of the pressure gauge, causing the detected pressure value to be smaller than the actual pressure.

[0004] 2. Smaller coal particles in the coal flow will enter the pressure gauge and adhere to the pressure measuring spring due to the viscosity of the coal flow, causing the hardness of the pressure measuring spring surface to increase, thereby reducing the sensitivity of the pressure measuring spring response, and ultimately causing the detected pressure value to be smaller than the actual pressure.

[0005] In summary, when one or two of the above problems occur, the pressure detected by the pressure gauge will have a large error; at the same time, due to blockage and adhesion, it is necessary to replace the pressure gauge in time, which reduces the single-use effectiveness of the pressure gauge. Therefore, the current method of using a pressure gauge to detect the pressure in the cyclone feed pipe needs further improvement. Utility Model Content

[0006] In order to avoid and overcome the technical problems existing in the prior art, the utility model provides a pressure detection device for a cyclone feed pipe, which can effectively reduce the amount of coal particles entering the pressure gauge and extend the single-use time of the pressure gauge.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] A pressure detection device for a cyclone feed pipe, a pressure gauge is installed on the feed pipe, a spoiler is provided on the outer side of the inlet of a pressure measuring hole opened on the wall of the feed pipe, the frontal surface of the spoiler is a flow-impermeable plate, and a filter hole for filtering coal flow is opened on the back surface of the spoiler.

[0009] As a further solution of the utility model: the upstream surface and the downstream surface of the spoiler are both streamlined, and the upstream surface and the downstream surface are symmetrically distributed along the plane where the boundary line between the two is located.

[0010] As a further solution of the utility model: the spoiler is hemispherical, and the symmetry axis of the spoiler coincides with the axis of the pressure measuring hole.

[0011] As a further solution of the utility model: the filter holes are evenly distributed on the back flow surface of the spoiler.

[0012] As a further solution of the utility model: the apertures of the filter holes are the same, and the apertures of the filter holes are smaller than the average diameter of the coal particles in the coal flow.

[0013] As a further solution of the present invention: the material of the spoiler is stainless steel.

[0014] As a further solution of the utility model: the edge of the spoiler is pressed against the tube wall of the feed pipe and is fixed to the tube wall of the feed pipe by welding.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] 1. The utility model uses a spoiler cover which is arranged on the outside of the pressure measuring hole and filters the coal flow, which can effectively filter out the coal particles in the coal flow, thereby reducing the amount of coal particles entering the pressure gauge per unit time and reducing the probability of the pressure measuring hole being blocked; at the same time, the amount of coal particles attached to the pressure measuring spring piece per unit time is reduced, so that the pressure measuring spring piece can maintain the pressure measuring sensitivity for a long time and extend the single use time of the pressure gauge. The frontal surface of the spoiler is designed as a flow-impermeable plate body, which blocks the front side of the pressure measuring hole, reduces the coal flow speed handled by the inlet of the pressure measuring hole, reduces the thrust of the coal particles at the inlet, and further reduces the amount of coal particles entering the pressure gauge. After the coal flow flows through the frontal surface of the spoiler, it will flow along the back flow surface. At this time, some coal particles attached to the back flow surface will be separated from the back flow surface under the scouring action of the coal flow, thereby reducing the possibility of the filter hole being blocked, thereby maintaining the connection between the pressure gauge and the coal flow, and maintaining the accuracy of the pressure measurement.

[0017] 2. The utility model adopts streamlined frontal surface and rear surface, which can effectively reduce flow resistance and reduce the influence of the spoiler on the flow of coal.

[0018] 3. The utility model adopts stainless steel material to make the spoiler, and uses the corrosion-resistant property of stainless steel to extend the service life of the spoiler. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the assembly structure of the feed pipe, the pressure gauge and the spoiler in the utility model.

[0020] Figure 2 It is a schematic diagram of the structure of the spoiler in the utility model.

[0021] Figure 3 It is a schematic diagram of the structure of the outside of the feed pipe in the utility model.

[0022] In the figure: 1, feed pipe; 11, pressure measuring hole; 2, pressure gauge; 3, spoiler; 31, upstream surface; 32, downstream surface; 321, filter hole. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] See also Figure 1 to Figure 3 In an embodiment of the utility model, a pressure detection device for a cyclone feed pipe is provided, wherein the spoiler 3 is hemispherical, and the axis of symmetry of the spoiler 3 coincides with the axis of the pressure measuring hole 11, and the streamlined upstream surface 31 and the downstream surface 32 can effectively reduce the flow resistance and reduce the influence of the spoiler 3 on the flow of coal.

[0025] The spoiler 3 is made of stainless steel, and the corrosion resistance of stainless steel is used to extend the service life of the spoiler 3. The spoiler 3 is installed at the corresponding pressure measuring hole 11 by welding, which improves the installation firmness. The welding can seal the matching gap between the spoiler 3 and the pipe wall to prevent the coal flow from flowing into the spoiler 3 from the matching gap. The apertures of each filter hole 321 are the same, and the aperture of the filter hole 321 is smaller than the average diameter of the coal particles in the coal flow. Such an aperture setting can effectively filter out coal particles of most particle sizes, and at the same time, it will not be easily blocked due to the small aperture.

[0026] The spoiler 3 is arranged on the outside of the pressure measuring hole 11 and filters the coal flow, which can effectively filter out the coal particles in the coal flow, thereby reducing the amount of coal particles entering the pressure gauge 2 per unit time and reducing the probability of the pressure measuring hole 11 being blocked; at the same time, it reduces the amount of coal particles attached to the pressure measuring spring piece per unit time, so that the pressure measuring spring piece can maintain the pressure measuring sensitivity for a long time, and prolong the single use time of the pressure gauge 2. The frontal surface 31 of the spoiler 3 is designed as a flow-impermeable plate body, which blocks the front side of the pressure measuring hole 11, reduces the coal flow velocity handled by the inlet of the pressure measuring hole 11, reduces the thrust on the coal particles at the inlet, and further reduces the amount of coal particles entering the pressure gauge 2. After the coal flow passes through the upstream surface 31 of the spoiler 3, it will flow along the downstream surface 32. At this time, some coal particles attached to the downstream surface 32 will be separated from the downstream surface 32 under the scouring effect of the coal flow, thereby reducing the possibility of the filter hole 321 being blocked, thereby maintaining the connection between the pressure gauge 2 and the coal flow, and maintaining the accuracy of the pressure measurement.

[0027] In the coal preparation process, the pressure gauge connected to the cyclone feed pipe will increase slightly and then drop sharply when the cyclone is blocked. When the feed pressure is 0.02Mpa lower than the lower limit of the effective separation pressure, the pressure monitoring system that detects the pressure in the pressure gauge in real time will issue a cyclone blockage alarm, and interlock and stop the clean coal product belt, clean coal centrifuge, belt or anchor chain of the clean coal slime recovery system, clean coal de-mediation screen and raw coal system, and automatically guide the unqualified clean coal that blocks the cyclone into the mixed coal bin to avoid contaminating the qualified clean coal products.

[0028] The pressure data transmitted in real time by the pressure monitoring system is highly accurate and has a fast transmission speed. It can promptly remind the heavy medium personnel to make various operational adjustments after the plugging cyclone. There are very few false alarms and misleading personnel, which improves the continuity of production and saves products. In addition, the pressure monitoring system has strong anti-interference ability and is not affected by other factors. It does not require additional equipment and material investment, and only needs to use the existing data signal to do transmission interlocking.

[0029] An example of the application of the pressure monitoring system: After the medium pump has been operating normally for 10 minutes, the cyclone reaches the sorting pressure: between 220-300Kpa. During the normal production process, the pressure in the pressure gauge 2 on the cyclone suddenly drops below 200Kpa, and an early warning appears on the pressure monitoring system interface. At the same time, the corresponding clean coal belt stops running, and the corresponding unloading chute flap is automatically moved from the clean coal bunker to the middle coal belt. The upstream equipment interlocked with the clean coal belt, such as the raw coal feeder, raw coal transfer belt, raw coal belt, desludging screen, clean coal de-mediation screen, clean coal centrifuge, clean coal slime centrifuge and flotation clean coal filter press, are all stopped. When the unloading chute flap is completely moved into the middle coal belt, the upstream equipment is restarted to complete the subsequent work.

[0030] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A pressure detection device for a cyclone inlet pipe, wherein a pressure gauge (2) is installed on the inlet pipe (1), characterized in that: A spoiler cover (3) is provided on the outer side of the inlet of a pressure measuring hole (11) provided on the wall of a feed pipe (1). The frontal surface (31) of the spoiler cover (3) is a flow-impermeable plate body, and the rear surface (32) of the spoiler cover (3) is provided with a filter hole (321) for filtering the coal flow.

2. A pressure detection device for a cyclone inlet pipe according to claim 1, characterized in that: The upstream surface (31) and the downstream surface (32) of the spoiler (3) are both streamlined, and the upstream surface (31) and the downstream surface (32) are symmetrically distributed along the plane where the boundary line between the upstream surface (31) and the downstream surface (32) is located.

3. A pressure detection device for a cyclone inlet pipe according to claim 1 or 2, characterized in that: The spoiler cover (3) is hemispherical, and the symmetry axis of the spoiler cover (3) coincides with the axis of the pressure measuring hole (11).

4. A pressure detection device for a cyclone inlet pipe according to claim 3, characterized in that: The filter holes (321) are evenly distributed on the back flow surface (32) of the spoiler (3).

5. A pressure detection device for a cyclone inlet pipe according to claim 4, characterized in that: The apertures of the filter holes (321) are all the same, and the apertures of the filter holes (321) are smaller than the average diameter of the coal particles in the coal flow.

6. A pressure detection device for a cyclone inlet pipe according to claim 5, characterized in that: The spoiler (3) is made of stainless steel.

7. A pressure detection device for a cyclone inlet pipe according to claim 6, characterized in that: The edge of the spoiler (3) is pressed against the wall of the feed pipe (1) and is fixed to the wall of the feed pipe (1) by welding.

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