A backwash filter for a tunnel spray dust suppression device

Abstract

A backwash filter for a tunnel spray dust suppression device comprises a shell with a flange connected to the top, the flange is provided with opening one and opening two, a filter element is provided inside the shell, the filter element is fixed on the flange, and a sewage outlet is provided at the bottom of the shell; the filter also comprises a three-way valve, one port of the three-way valve is a filtered water outlet, the second port is connected to the opening two, the third port is connected to a three-way flexible joint, and the other two ports of the three-way flexible joint are respectively connected to opening one and a sewage inlet. The present invention solves the problems of low precision, easy clogging, cumbersome maintenance and cleaning, and poor filtering effect existing in the current water quality filtering method.

Description

Technical Field

[0001] The invention relates to the field of underground supporting devices in coal mines, and in particular to a backwashing filter for a tunnel spray dust suppression device. Background Art

[0002] Coal is a basic energy source. During the mining process, various tunnels need to be opened underground for personnel access, equipment transportation, coal transfer and transportation, return air tunnels, and communication tunnels. Therefore, there are many complicated tunnels in the coal mine, and some main tunnels are very long, stretching for several kilometers or even more than ten kilometers. At the same time, in addition to the tunnels for personnel access, other tunnels also have dust reduction requirements and need to be unmanned to achieve automatic spray dust reduction, such as coal transportation and transfer tunnels. Therefore, each coal mine has a great demand for underground tunnel dust reduction equipment.

[0003] The working environment in coal mines is harsh, and a large amount of dust poses a great threat to the health of workers. In addition, dust also poses an explosion risk. As the country has attached great importance to the health and safety of coal miners in recent years, the requirements for dust reduction in tunnels have received more and more attention. However, due to the poor water quality in coal mines, the current tunnel spray dust reduction devices generally have problems such as easy nozzle clogging, spray failure, frequent maintenance, and short equipment life. In order to meet the complex working environment and strict dust reduction requirements underground, and to maximize the reliability of existing tunnel spray dust reduction devices, major manufacturers at home and abroad are seeking more effective methods.

[0004] At present, the water filtration methods mostly used in domestic tunnel dust suppression spray devices are as follows:

[0005] A one-way Y-type filter is installed on the main water inlet line, but the filtration accuracy is low and it is easy to get clogged. In addition, the cleaning and maintenance of the filter requires disassembling the pipeline, which is inconvenient. The connecting pipe threads are often rusted and difficult to unscrew, and repeated disassembly and assembly can easily cause leakage at the connection.

[0006] There is also a water quality filter that comes with the underground water source clean water pump. Because the underground water source is generally coarsely filtered with an accuracy of less than 20 meshes, the nozzle aperture of the tunnel spray dust reduction device is very small (less than 1.0mm), the filtering effect cannot meet the requirements, and the nozzle is easily blocked, causing the entire dust reduction system to fail frequently. Summary of the invention

[0007] The purpose of the present invention is to provide a backwash filter for a tunnel spray dust suppression device to solve the problems of low precision, easy clogging, complicated maintenance and cleaning, and poor filtering effect existing in the above-mentioned water quality filtering methods.

[0008] The technical solution adopted by the present invention is:

[0009] A backwash filter for a tunnel spray dust suppression device comprises a shell with a flange connected to the top, the flange is provided with an opening 1 and an opening 2, a filter element is provided inside the shell, the filter element is fixed on the flange, and a sewage outlet is provided at the bottom of the shell;

[0010] The filter also includes a three-way valve, one port of which is a filtered water outlet, a second port is connected to the second opening, and a third port is connected to a three-way union joint, and the other two ports of the three-way union joint are respectively connected to the first opening and the sewage inlet.

[0011] Furthermore, the ratio of the diameters of the opening 1 to the opening 2 is 1:1.5-3.0.

[0012] Furthermore, the three-way valve is a three-way ball valve.

[0013] Furthermore, the three-way valve is a pneumatic or hydraulically controlled three-way ball valve to achieve remote automatic control of filtering or backwashing procedures.

[0014] Furthermore, the diameter ratio of the shell and the filter element is 1:0.7-0.9.

[0015] Furthermore, pressure gauges are provided on both opening one and opening two.

[0016] Beneficial effects of the present invention:

[0017] This device is designed with water inlet and outlet joints on the connecting flange. Especially during backwashing, the amount of water flowing through the filter element is increased and the amount of water at the original water inlet is reduced, so that the water inlet of the main pipeline is divided into two routes. Through the throttling effect of different apertures, backwashing is mainly achieved and forward flushing is auxiliary, so that the backwashing function also has the forward flushing effect, which improves the cleaning efficiency. No additional piping is added, the device has a small size, light weight, low cost, no need to connect to electricity, easy installation, simple operation and maintenance, and long service life of the system, which largely solves the shortcomings of the existing backwashing filter used in the spray dust suppression device in the coal mine tunnel.

[0018] Working principle of the present invention:

[0019] Normal use principle Figure 2 As shown, the device is connected to the water pipeline system of the tunnel spray dust suppression device, the drain valve is closed, and the three-way ball valve is adjusted. The water flow path is shown by the arrow. Water enters the filter element from the outer wall of the filter element, and impurities are filtered on the outer wall by the filter element. The filtered water inside the filter element passes through the open two-way and three-way ball valve outlets in turn and enters the main water pipeline.

[0020] Backwashing Figure 3As shown, open the drain valve, close the outlet of the three-way ball valve, and the water path is divided into two paths, entering the housing from opening one and opening two respectively. Since the diameter of opening two is larger than that of the opening, most of the water enters the interior of the filter element, and then passes through the outer wall of the filter element in the reverse direction to wash away the impurities attached to the outer wall of the filter element. A small part of the water enters the annulus between the housing and the filter element through opening one (the water inlet during the original filtration), and directly washes the outer wall of the filter element along the axial direction of the filter element. By dividing the water inlet of the main line into two paths, the throttling effect of different apertures is used, so that backwashing is the main direction and forward flushing is the auxiliary direction, and the inside and outside of the filter element are flushed at the same time to improve the cleaning efficiency.

[0021] This solution is the first case in China to combine forward and backwashing methods in the field of backwashing filters. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the device of the present invention;

[0023] Figure 2 This is a filtering principle diagram of the present invention when it is used normally;

[0024] Figure 3 This is the backwash principle diagram of the present invention;

[0025] In the figure, 1, sewage inlet, 2, three-way union joint, 3, three-way valve, 4, filtered water outlet, 5, opening one, 6, shell, 7, filter element, 8, sewage outlet, 9, opening two, 10, flange. DETAILED DESCRIPTION

[0026] The structure of the present invention is further described below in conjunction with the accompanying drawings.

[0027] Example 1

[0028] like Figures 1 to 3 As shown, a backwash filter for a tunnel spray dust suppression device includes a shell 6 with a flange 10 connected to the top, and the flange 10 is provided with an opening 1 5 and an opening 2 9, and the ratio of the diameters of the opening 1 5 and the opening 2 9 is 1:1.5.

[0029] A filter element 7 is arranged inside the housing 6, and the diameter ratio of the housing 6 to the filter element 7 is 1:0.7.

[0030] The filter element 7 is fixed on the flange 10 (the top of the filter element is not directly connected to the two holes on the flange, so that the sewage flows in from the entire side wall of the filter element), and a sewage outlet 8 is provided at the bottom of the shell;

[0031] The filter also includes a hydraulically controlled three-way ball valve 3 to realize remote automatic control of filtering or backwashing procedures. One port of the three-way ball valve 3 is the filtered water outlet 4, the second port (when filtering, it is used as the filtered water inlet, and enters the filtered water outlet from this port, and when backwashing, it is used as the main water inlet of the flushing water) is connected to the second opening 9, and the third port is connected to the three-way union 2, and the other two ports of the three-way union 2 are respectively connected to the first opening 5 and the sewage inlet 1;

[0032] Both opening 1 5 and opening 2 9 are provided with pressure gauges (which can read the pressure values ​​on the water inlet and outlet pipes in real time, and timely understand the clogging of the filter element according to the change of the pressure difference between the two)

[0033] Example 2

[0034] The difference from the first embodiment is that the ratio of the diameters of the first opening 5 and the second opening 9 is 1:3, and the ratio of the diameters of the housing 6 and the filter element 7 is 1:0.8.

Claims

1. A backwash filter for a tunnel spray dust suppression device, characterized in that: The invention comprises a housing (6) having a flange (10) connected to the top thereof, the flange (10) being provided with an opening 1 (5) and an opening 2 (9), a filter element (7) being provided inside the housing (6), the filter element (7) being fixed to the flange (10), and a sewage outlet (8) being provided at the bottom of the housing; the opening 1 (5) and The ratio of the diameters of the second opening (9) is 1:1.5~3.0; The filter further comprises a three-way valve (3), one port of the three-way valve (3) being a filtered water outlet (4), a second port being connected to the second opening (9), a third port being connected to a three-way union joint (2), and the other two ports of the three-way union joint (2) being connected to the first opening (5) and the water inlet (1) respectively; The three-way valve (3) is a pneumatically or hydraulically controlled three-way ball valve.

2. A backwash filter for a tunnel spray dust suppression device as claimed in claim 1, characterized in that: The diameter ratio of the housing (6) to the filter element (7) is 1:0.7-0.

9.

3. A backwash filter for a tunnel spray dust suppression device as claimed in claim 1, characterized in that: Pressure gauges are provided on both opening 1 (5) and opening 2 (9).

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