Gas pipeline system and fault analysis and processing method

Abstract

The invention discloses a fuel gas pipeline system and a fault analysis and processing method, the fuel gas pipeline system comprises a gas transmission main pipe and a buffer tank, and is characterized in that the gas transmission main pipe is connected with the buffer tank through two branch units which are arranged in parallel; each branch unit comprises a branch pipe, an upstream valve, a filter, an emptying pipe, a downstream valve, a pressure difference sensor used for detecting the differential pressure between an inlet and an outlet of the filter and an air pressure sensor used for detecting the air pressure of an inner cavity of the filter, and the upstream valve, the filter, the emptying pipe and the downstream valve are sequentially arranged on the branch pipe; an emptying valve is arranged on the emptying pipe, and the differential pressure sensor and the air pressure sensor are both electrically connected with the controller. The method can be used for accurately judging blockage and gas leakage of the gas pipeline filter, can avoid misjudgment, can perform gas leakage repair and filter element replacement under the condition of continuous gas supply, and is very safe.

Description

Technical Field

[0001] The invention relates to a gas pipeline system and a fault analysis and processing method. Background Art

[0002] After the gas is mined from the gas source, it often contains a certain amount of solid impurities, such as sand, rust, rock fragments, etc. These solid particles have strong kinetic energy when the gas flows at high speed. When the gas directly enters the buffer tank, the solid impurities will wash the inner wall of the buffer tank with the airflow. Under long-term action, the inner wall of the buffer tank may be worn, especially near the gas inlet and the turning point in the tank. For example, if the buffer tank is made of metal, the washing of solid impurities may make the tank wall thinner, reducing the strength and service life of the buffer tank. After some solid impurities are deposited in the buffer tank, they may have an adverse effect on the normal operation of the buffer tank. In addition, if too much impurity accumulates in the buffer tank, it may also affect the gas distribution in the buffer tank, thereby affecting its buffering and stability; in severe cases, it may even wear through the tank wall, causing gas leakage and causing safety accidents. Therefore, the gas needs to be treated with a filter before entering the buffer tank from the transmission pipeline.

[0003] Previously, the gas delivery pipe was connected to the buffer tank through a single filter. However, the following deficiencies were found in actual use and are explained as follows:

[0004] First, the existing filter is to replace the filter element regularly (such as every three months). When replacing the filter element, it is necessary to open and take out the filter element to determine whether the filter element needs to be replaced and whether it is blocked. Normally, if the filter is partially blocked (especially slightly or moderately blocked), the pressure loss will not be large, and the air path is still connected, which makes it difficult to detect the blockage in time.

[0005] Second, since the pressure loss will not be large when the filter has a slight leak, there is no leakage sound, it is not easy to find, and the air path is still connected, there is also the problem that it is difficult to detect the leak in time.

[0006] Third, when a large pressure loss is detected in the pipeline, there is a problem of not being able to quickly determine whether it is caused by a blockage or a leak.

[0007] Fourth, since a single filter is connected to the buffer tank, when the filter element is replaced or the leak is repaired, the upstream and downstream air paths of the filter need to be closed at the same time, resulting in the buffer tank and downstream not being able to work normally. Summary of the invention

[0008] The present invention aims to provide a gas pipeline system and a fault analysis and processing method to solve the combined problems in the prior art of being unable to quickly and accurately judge when a filter in the gas pipeline has a slight blockage or a slight leak; and the gas circuit being closed when the filter is replaced or the leak is repaired, causing the buffer tank and downstream to be unable to work normally.

[0009] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a gas pipeline system, including a gas transmission main pipe and a buffer tank, characterized in that: the gas transmission main pipe is connected to the buffer tank through two branch units arranged in parallel; the two branch units each include a branch pipe, an upstream valve, a filter, a drain pipe, a downstream valve, a differential pressure sensor for detecting the differential pressure between the inlet and outlet of the filter, and an air pressure sensor for detecting the air pressure in the inner cavity of the filter, the upstream valve, the filter, the drain pipe and the downstream valve are arranged on the branch pipe in sequence, the drain pipe is provided with a drain valve, and the differential pressure sensor and the air pressure sensor are both electrically connected to the controller.

[0010] Preferably, the filter comprises a shell, a filter element, an air inlet pipe, an air outlet pipe, a top cover and a vertical pole; the top cover is detachably fixed to the upper end cover of the shell; the air inlet pipe and the air outlet pipe are arranged on the shell, the outer end of the air inlet pipe is connected to the upstream valve, the inner end of the air inlet pipe is provided with a positioning tube, and the lower end of the filter element is vertically inserted into the step hole of the positioning tube; the lower end of the vertical pole passes through the positioning tube and is fixedly connected to the inner wall of the air inlet pipe; the upper end of the vertical pole is detachably fixed with a pressure cap for pressing the filter element; the inner end of the air outlet pipe is connected to the inner cavity of the shell.

[0011] Furthermore, an external thread is provided at the upper end of the vertical rod; the upper end of the vertical rod passes through the center hole of the pressure cover upward and is connected with a nut.

[0012] Furthermore, a sewage pipe is externally connected to the bottom of the shell, and a sewage valve is arranged on the sewage pipe.

[0013] Furthermore, a collecting bucket is fixedly arranged on the vertical pole, the collecting bucket is located directly below the positioning tube and the outer diameter of the collecting bucket is smaller than the smallest inner diameter of the positioning tube; a connecting block is fixedly arranged on the inner wall of the air intake pipe, and the lower end of the vertical pole is threadedly connected to the connecting block and is detachably fixed.

[0014] Furthermore, a first ring baffle is fixedly provided at the upper end of the inner wall of the collection barrel, and the first ring baffle is radially inclined downwardly toward the center direction of the vertical pole; a first gap is provided between the inner edge of the first ring baffle and the outer wall of the vertical pole; a second ring baffle is fixedly provided on the vertical pole, and the second ring baffle is radially inclined downwardly toward the side wall of the collection barrel; the middle part of the second ring baffle is located directly below the inner edge of the first ring baffle and there is a second gap between them; a third gap is provided between the outer edge of the second ring baffle and the inner wall of the collection barrel;

[0015] Furthermore, a rotating sleeve is rotatably mounted on the vertical rod, and the rotating sleeve has blades; a frame is fixedly mounted on the rotating sleeve, and two strip brushes for cleaning the inside of the filter element are symmetrically mounted on both side ends of the frame.

[0016] Furthermore, two side ends of the frame are provided with two lugs which are symmetrical and spaced apart; two smooth rods are movably mounted on the two lugs; the inner ends of the two smooth rods are provided with a stopper with an enlarged shape; and the outer ends of the two smooth rods are fixedly connected to the strip brush.

[0017] Furthermore, it also includes a liner ring; the liner ring is arranged between the inner wall of the shell and the filter element and is limited and supported by the positioning tube; the cross-section of the liner ring is U-shaped, and the bottom wall of the liner ring is provided with mesh holes.

[0018] Furthermore, the mesh has a pore size of 1-2 mm.

[0019] An object of the present invention is to provide a fault analysis and processing method, characterized in that it comprises the following steps:

[0020] S1. The differential pressure value △P1 between the inlet and outlet of the filter is collected in real time through the differential pressure sensor. When the collected differential pressure value △P1 is greater than the preset differential pressure threshold △P0, a fault prompt is issued;

[0021] S2, first close the upstream valve and the downstream valve and obtain the first air pressure Pn1 of the filter cavity collected by the air pressure sensor at this time; then wait for a time T and then obtain the second air pressure Pn2 of the filter cavity collected by the air pressure sensor at this time;

[0022] S3. Fault diagnosis:

[0023] When the second air pressure Pn2 is less than the first air pressure Pn1, it is determined that the filter is leaking, and then processing is performed according to step S4;

[0024] When the second air pressure Pn2 is equal to or greater than the first air pressure Pn1, it is determined that the filter element is clogged, and then the process is performed according to step S5;

[0025] S4. When a leakage is detected in one of the branch units, the other branch unit still maintains normal operation. Only the following operations need to be performed on the branch unit with leakage:

[0026] First, close the upstream valve and the downstream valve on the branch pipe, then open the drain valve to drain the gas in the filter until the air pressure value collected by the air pressure sensor drops to the preset safety pressure value, then find the leaking part on the filter and repair it; when the treatment is completed, close the drain valve first, then open the upstream valve and the downstream valve;

[0027] S5. When it is detected that the filter element of one of the branch units is clogged, the other branch unit still maintains normal operation. Only the following operations need to be performed on the branch unit with the clogged filter element:

[0028] First, close the upstream valve and the downstream valve on the branch pipe; then open the drain valve to drain the gas in the filter until the air pressure value collected by the air pressure sensor drops to the preset safety pressure value, and then replace the filter element of the filter; when the filter element is replaced, close the drain valve first, and then open the upstream valve and the downstream valve.

[0029] Beneficial effects of the present invention:

[0030] First, in the normal state, the two branch units of the present invention work simultaneously, and dual-channel gas filtration can be realized. Due to the dual-channel design, the filtering effect is improved and the normal service life of a single filter can be extended; this can solve the problem of short maintenance cycle of the existing single filter; even if the filter on one of the branch units fails, the filter on the other branch unit can continue to work, which improves the reliability and stability of the entire filtration system, and thus solves the problem that the existing single filter cannot continue to work due to a failure;

[0031] Second, the present invention can monitor the real-time working status of the filter on the branch unit in real time, and automatically discover when the filter fails, and then close the upstream valve and the downstream valve, and combine the pressure values ​​of the filter cavity collected at different time points, so as to achieve accurate judgment of the fault problem, avoid misjudgment, and replace the cumbersome methods such as opening the filter and taking out the filter element for inspection. It is very efficient and safe. Even if the filter is partially blocked (especially slightly blocked or moderately blocked) and the filter has a slight air leak, it can be checked normally without being restricted by conditions. Therefore, this embodiment has the advantages of timely fault detection, unlimited conditions, accurate judgment, safe detection, and rapid processing;

[0032] Third, the present invention adopts inside-out filtering during filtering, and the gas flows from the inside of the filter element to the outside. In this process, impurities are blocked inside the filter element, and the filtered gas flows out through the large inner cavity space outside the outer layer of the filter element. Filtering from inside to outside can first intercept impurities inside the filter element, so that impurities will be blocked inside the filter element first, safely protecting the relatively fragile filter membrane and other structures of the outer layer of the filter element, thereby extending the service life of the filter element; because the inside-out filtering can form a better flow distribution of the gas inside the filter element; because the gas enters from the inside, it will diffuse evenly in all directions under the action of pressure, so that the gas can be more fully in contact with the filter medium of the filter element, thereby improving the filtering efficiency of tiny particle impurities and liquid impurities; because the impurities are collected inside the filter element, when the filter element is cleaned or replaced, these impurities are easier to be processed in a centralized manner; it is also convenient to reuse the filter element. When the inside-out filtering method is adopted, the impurities can be more effectively flushed out by reverse flushing (i.e., flushing the cleaning liquid from the outside into the filter element). And because the impurities are concentrated in a relatively small space inside the filter element, it is also easier to remove the impurities from the filter during the sewage discharge process;

[0033] Fourthly, the present invention collects particles dropped from the filter element through the collecting bucket, and the lower end of the vertical rod is threadedly connected and fixed to the connecting block on the inner wall of the air inlet pipe, which is a detachable connection. Therefore, when replacing the filter element, after taking out the old filter element, the vertical rod and the connecting block can be loosened and separated, and the vertical rod and the collecting bucket can be taken out of the housing as a whole. After the particles in the collecting bucket are poured out and cleaned outside, they can be reinstalled and continued to be used, and cleaning and maintenance are extremely simple.

[0034] Fifth, in the present invention, after the impurities dropped from the filter element fall onto the first ring baffle on the collection bucket, they first slide down to the first gap, then fall onto the second ring baffle, then slide down and pass through the second gap, and finally enter the collection bucket from the third gap to complete the collection and continuous accumulation. Since a special channel is formed between the first ring baffle and the second ring baffle, the pressure airflow entering the air intake pipe will not act on the inside of the collection bucket, ensuring that the impurities collected in the collection bucket will not be discharged upwards. It is especially suitable for smaller impurities, expanding the range that can be collected, and can effectively prevent the problem of dust interference from the airflow again;

[0035] Sixth, the present invention can realize internal cleaning because the airflow entering the filter element can automatically drive the two strip brushes to rotate along the inner wall of the filter element through the blades, and the fallen dust will fall into the collection bucket and be collected without running out, which can realize automatic cleaning and automatic collection, greatly prolonging the working life of the filter element, and also greatly reducing the clogging problem;

[0036] Seventh, the present invention can improve the cleaning ability because the strip brush can generate a certain contact pressure (i.e., brush force) on the inner wall of the filter element during centrifugal motion; in addition, when the strip brush rotates for cleaning, the brush force and rotation speed will increase in a positive correlation with the increase in the gas flow pressure and flow rate. When the air volume entering the filter element is larger, the filtering volume is larger, and the dust is more, the brush force and rotation speed generated by the strip brush will also be larger, and it can be automatically adjusted with the gas flow and air pressure. In addition, when the thickness of the dust attached to the inner wall of the filter element continues to increase, the radial position of the strip brush can also be adjusted to adapt to the change, thereby preventing the problem of conventional strip brushes being damaged by fixed radial positions.

[0037] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a structural schematic diagram of a gas pipeline system in Embodiment 1 of the present invention.

[0039] Figure 2 It is a schematic diagram of the structure of the filter in the third embodiment of the present invention.

[0040] Figure 3 It is a schematic diagram of the structure of the positioning tube in the third embodiment.

[0041] Figure 4 It is a schematic diagram of the structure of the filter in the fourth embodiment of the present invention.

[0042] Figure 5 yes Figure 4 Enlarged view of point A in the middle.

[0043] Figure 6 It is a three-dimensional diagram of the connection relationship between the collection bucket and the vertical pole in the fourth embodiment of the present invention.

[0044] Figure 7 It is a schematic diagram of the structure of the filter in the fifth embodiment of the present invention.

[0045] Figure 8 It is a structural schematic diagram of the connection relationship between the collection bucket, the vertical rod and the strip brush when they are taken out as a whole in the fifth embodiment of the present invention.

[0046] Fig. 9 yes Figure 8 Enlarged view of point B in the middle.

[0047] Fig.10 It is a three-dimensional diagram of the connection relationship between the upright pole, the rotating sleeve, the blades, the frame and the strip brush in the fifth embodiment of the present invention.

[0048] Fig.11It is a schematic diagram of the structure of the filter in the sixth embodiment of the present invention.

[0049] Fig.12 It is a schematic diagram of the structure of the liner ring in the sixth embodiment of the present invention. DETAILED DESCRIPTION

[0050] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0051] Example 1: See Figure 1 A gas pipeline system includes a gas transmission main pipe 1 and a buffer tank 3, wherein the gas transmission main pipe 1 is connected to the buffer tank 3 through two branch units arranged in parallel.

[0052] Among them, the two branch units each include a branch pipe 2-1, an upstream valve 2-2, a filter 2-3, a drain pipe 2-4, a downstream valve 2-5, a differential pressure sensor 2-7 for detecting the differential pressure between the inlet and outlet, and an air pressure sensor 2-8 for detecting the air pressure in the inner cavity of the filter 2-3. The upstream valve 2-2, the filter 2-3, the drain pipe 2-4 and the downstream valve 2-5 are sequentially arranged on the branch pipe 2-1, and the drain pipe 2-4 is provided with a drain valve 2-6. The differential pressure sensor 2-7 and the air pressure sensor 2-8 are both electrically connected to the controller 4.

[0053] The working characteristics of this embodiment are analyzed as follows:

[0054] (1) In normal conditions, the two branch units work simultaneously to achieve dual-channel gas filtration. Due to the dual-channel design, the filtration effect is improved and the normal service life of a single filter can be extended. This can solve the problem of short maintenance cycle of the existing single filter 2-3;

[0055] (2) Even if the filter 2-3 on one branch unit fails, the filter 2-3 on the other branch unit can continue to work, thereby improving the reliability and stability of the entire filtering system, thereby solving the problem that the existing single filter 2-3 cannot continue to work due to a failure;

[0056] (3) Since the upstream valve 2-2, the filter 2-3, the drain pipe 2-4 and the downstream valve 2-5 are sequentially arranged on each branch pipe 2-1, and the drain valve 2-6 is arranged on the drain pipe 2-4, when one of the branch units fails, such as when a blockage occurs, the upstream valve 2-2 and the downstream valve 2-5 on the failed branch unit are closed separately to stop the gas from flowing into the filter 2-3, and the gas in the filter 2-3 cannot enter the buffer tank 3. Then the drain valve 2-6 on the drain pipe 2-4 is opened to release the gas pressure in the filter to a safe range, and the gas in the filter 2-3 is discharged into the recovery tank (not shown) through the drain pipe 2-4, completing safe emptying and recovery; since the gas pressure in the filter 2-3 is reduced, there is no high pressure danger, and then the filter 2-3 can be opened to replace the filter element, ensuring the safety of replacement and maintenance. The other branch unit remains in normal working condition, so the filter element can be replaced or maintained without stopping gas delivery, ensuring the continuous supply of gas. It is particularly suitable for occasions with high requirements for gas supply continuity, and solves the problem that the buffer tank and downstream cannot work normally when the existing filter is replaced.

[0057] (4) Since the branch unit is provided with a differential pressure sensor 2-7 for detecting the differential pressure between the inlet and outlet and an air pressure sensor 2-8 for detecting the air pressure in the inner cavity of the filter 2-3, and the differential pressure sensor 2-7 and the air pressure sensor 2-8 are both electrically connected to the controller 4. The differential pressure signal collected by the differential pressure sensor 2-7 and the air pressure signal collected by the air pressure sensor 2-8 are sent to the controller, and the controller realizes real-time online monitoring, fault prompting and analysis and processing. Therefore, during operation, the differential pressure value △P1 between the inlet and outlet of the filter 2-3 is collected in real time through the differential pressure sensor 2-7, and a fault prompt is issued when the collected differential pressure value △P1 is greater than the preset differential pressure threshold △P0; then the upstream valve 2-2 and the downstream valve 2-3 are closed first, and the first air pressure Pn1 of the inner cavity of the filter 2-3 collected by the air pressure sensor 2-8 is obtained; then the second air pressure Pn2 of the inner cavity of the filter 2-3 collected by the air pressure sensor 2-8 is obtained after waiting for a time T (such as 30 minutes); and then the fault is judged: when the second air pressure Pn2 is less than the first air pressure Pn1, it is determined that the filter 2-3 has a leak, and then the leak is handled; when the second air pressure Pn2 is equal to or greater than the first air pressure Pn1, it is determined that the filter 2-3 has a filter element clogged, and then the filter element is replaced for processing.

[0058] Therefore, the present embodiment can monitor the real-time working status of the filter 2-3 on the branch unit in real time, and automatically detect when the filter 2-3 fails, and then close the upstream valve 2-2 and the downstream valve 2-5, and combine the pressure values ​​of the inner cavity of the filter 2-3 collected at different time points, so as to achieve accurate judgment of the fault problem and avoid misjudgment. It replaces the cumbersome methods of opening the filter and taking out the filter element for inspection, which is very efficient and safe. Even if the filter is partially blocked (especially slightly or moderately blocked) and the filter has a slight leak, it can be checked normally and is not restricted by conditions. Therefore, the present embodiment has the advantages of timely fault detection, unrestricted conditions, accurate judgment, safe detection, and rapid processing.

[0059] In summary, this embodiment can solve the combined problems in the prior art of being unable to quickly and accurately determine when a filter in the gas pipeline is slightly blocked or leaking; and the gas circuit being closed when the filter is replaced or the leak is repaired, causing the buffer tank and downstream to be unable to work normally.

[0060] Example 2: See Figure 1 Based on the gas pipeline system described in Embodiment 1 or other embodiments, this embodiment discloses a fault analysis and processing method, which includes the following steps:

[0061] S1, collecting the differential pressure value △P1 between the inlet and outlet of the filter 2-3 in real time through the differential pressure sensor 2-7, and issuing a fault prompt when the collected differential pressure value △P1 is greater than the preset differential pressure threshold △P0;

[0062] S2, first close the upstream valve 2-2 and the downstream valve 2-3 and obtain the first air pressure Pn1 of the inner cavity of the filter 2-3 collected by the air pressure sensor 2-8 at this time; then wait for a time T (30 minutes) and then obtain the second air pressure Pn2 of the inner cavity of the filter 2-3 collected by the air pressure sensor 2-8 at this time;

[0063] S3. Fault diagnosis:

[0064] When the second air pressure Pn2 is less than the first air pressure Pn1, it is determined that the filter 2-3 is leaking, and then the process is performed according to step S4;

[0065] When the second air pressure Pn2 is equal to or greater than the first air pressure Pn1, it is determined that the filter 2-3 is clogged, and then the process is performed according to step S5;

[0066] S4. When a leakage is detected in one of the branch units 2, the other branch unit 2 still maintains normal operation. It is only necessary to perform the following operations on the branch unit 2 with leakage:

[0067] First, close the upstream valve 2-2 and the downstream valve 2-5 on the branch pipe 2-1, and then open the drain valve 2-6 to drain the gas in the filter 2-3 until the collected air pressure value drops to the preset safety pressure value, and then find the leaking part on the filter 2-3 (the existing soap bubble detection method can be used) and repair it; when the treatment is completed, close the drain valve 2-6 first, and then open the upstream valve 2-2 and the downstream valve 2-5;

[0068] S5. When it is detected that the filter element of one of the branch units 2 is clogged, the other branch unit 2 still maintains normal operation. Only the following operations need to be performed on the branch unit 2 with the clogged filter element:

[0069] First, close the upstream valve 2-2 and the downstream valve 2-5 on the branch pipe 2-1; then open the drain valve 2-6 to drain the gas in the filter 2-3 until the air pressure value collected by the air pressure sensor 2-8 drops to the preset safety pressure value, and then replace the filter element 2-32 in the filter 2-3; when the filter element is replaced, first close the drain valve 2-6, and then open the upstream valve 2-2 and the downstream valve 2-5.

[0070] This method is different from conventional means. It uses differential pressure sensor 2-7 and differential pressure sensor 2-7 which are combined with each other and cannot be completed separately. It obtains corresponding key data, parameter comparison, logical analysis and other combined elements at a specific time, and realizes and completes fault analysis and problem handling in a comprehensive manner. It can also meet the advantages of timely fault discovery, unrestricted conditions, accurate judgment, safe detection, and rapid processing.

[0071] Embodiment 3: This embodiment is a further improvement on the embodiment 1, mainly in that the filter adopts a different structure, as follows:

[0072] See also Figure 2-3 The filter 2-3 includes a housing 2-31, a filter element 2-32, an air inlet pipe 2-33, an air outlet pipe 2-34, a top cover 2-35 and a vertical rod 2-36; the top cover 2-35 is detachably fixed to the upper cover of the housing 2-31; the air inlet pipe 2-33 and the air outlet pipe 2-34 are arranged on the housing 2-31, the outer end of the air inlet pipe 2-33 is connected to the upstream valve 2-2, and the inner end of the air inlet pipe 2-33 is connected to the upstream valve 2-2. A positioning tube 2-37 is provided, and the lower end of the filter element 2-32 is vertically inserted into the step hole 2-371 of the positioning tube 2-37; the lower end of the vertical rod 2-36 passes through the positioning tube 2-37 and is fixedly connected to the inner wall of the air inlet pipe 2-33; the upper end of the vertical rod 2-36 is detachably fixed with a pressure cover 2-38 for pressing the filter element 2-32; the inner end of the air outlet pipe 2-34 is connected to the inner cavity of the shell 2-31.

[0073] The working principle of this filter is as follows: the gas first enters through the air inlet pipe 2-33 and enters the interior of the filter element 2-32 through the positioning pipe 2-37, and then is filtered from the inside to the outside, and the filtered gas enters the inner cavity of the shell 2-3, and then goes out through the air outlet pipe 2-34, thereby completing the filtering process.

[0074] The working principle of this filter is different from that of conventional filters (i.e., prior art):

[0075] In the conventional filter of the prior art, the gas first enters the inner cavity of the shell 2-3, then is filtered from the outside to the inside through the filter element 2-32, and then is discharged from the internal pipe of the filter element 2-32. The prior art has the following problems: (1) the existing gas impurities can only be partially intercepted by the filter element, and cannot be completely intercepted and filtered; the rest of the gas will stay in the shell 2-3 and will continue to accumulate, which is inconvenient to clean; (2) the existing filtering is from the outside to the inside, the inner cavity space is large, the gas cannot be more fully in contact with the filter medium of the filter element, and there is a problem of low filtering efficiency.

[0076] By comparison, the filter of the present invention adopts a new structural design, the core point of which is that it works in an inside-out filtering mode, which has the following advantages:

[0077] (1) When filtering, the gas flows from the inside of the filter element to the outside. In this process, impurities are blocked inside the filter element, and the filtered gas flows out through the large inner cavity space outside the outer layer of the filter element. Filtering from the inside to the outside can first intercept impurities inside the filter element, so that impurities will be blocked inside the filter element first, safely protecting the relatively fragile filter membrane and other structures on the outer layer of the filter element, thereby extending the service life of the filter element;

[0078] (2) The inside-out filtration can form a better flow distribution of the gas inside the filter element; because the gas enters from the inside, it will diffuse evenly in all directions under the action of pressure, so that the gas can be more fully in contact with the filter medium of the filter element, thereby improving the filtration efficiency of tiny particle impurities and liquid impurities;

[0079] (3) Since the impurities are collected inside the filter element, they are easier to handle in a centralized manner when cleaning or replacing the filter element. It is also convenient to reuse the filter element. When the inside-out filtration method is adopted, the impurities can be more effectively flushed out by reverse flushing (i.e. flushing the cleaning fluid from the outside into the filter element). Moreover, since the impurities are concentrated in a relatively small space inside the filter element, it is also easier to discharge the impurities from the filter during the sewage discharge process.

[0080] Furthermore, an external thread is provided at the upper end of the vertical rod 2-36; the upper end of the vertical rod 2-36 passes through the center hole of the pressure cover 2-38 upward and is connected with the nut 2-39.

[0081] During assembly, the nut 2-39 rotates downward to allow the pressure cover 2-38 to press the upper end of the filter element 2-32. The lower end of the filter element 2-32 is vertically inserted into the step hole 2-371 of the positioning tube 2-37 and is supported and concentrically positioned, which can prevent the filter element 2-32 from shaking and loosening and ensure more stable operation.

[0082] When the filter element 2-32 is replaced, first close the upstream valve 2-2 and the downstream valve 2-5 on the branch pipe 2-1; then open the drain valve 2-6 to drain the gas in the filter 2-3 until the air pressure value collected by the air pressure sensor 2-8 drops to the preset safety pressure value, and then replace the filter element 2-32 in the filter 2-3;

[0083] Specifically, the filter element replacement method is as follows: first remove the top cover 2-35, then loosen and take out the nut 2-39, then take out the pressure cover 2-38, then pull out the old filter element 2-32 from the positioning tube 2-37, then install the new filter element 2-32, then install the pressure cover 2-38, and lock it with the nut 2-39, then seal and install the top cover 2-35 and lock it, and the filter element replacement is completed;

[0084] When the filter element is replaced, first close the drain valve 2-6, and then open the upstream valve 2-2 and the downstream valve 2-5.

[0085] Furthermore, the bottom of the housing 2-31 is externally connected with a drain pipe 2-311, and a drain valve 2-312 is provided on the drain pipe 2-311. When replacing the filter element, the inside of the filter can also be cleaned, and the impurities at the bottom of the inner cavity of the housing 2-31 can be discharged by opening the drain valve 2-312.

[0086] Embodiment 4: This embodiment is a further improvement on the basis of embodiment 3, and is specifically as follows:

[0087] See also Figure 4-6 Furthermore, a collecting bucket 5-1 is fixedly arranged on the vertical pole 2-36, and the collecting bucket 5-1 is located directly below the positioning tube 2-37 and the outer diameter of the collecting bucket 5-1 is smaller than the smallest inner diameter of the positioning tube 2-37; a connecting block 2-331 is fixedly arranged on the inner wall of the air intake pipe 2-33, and the lower end of the vertical pole 2-36 is threadedly connected to the connecting block 2-331 and can be detachably fixed.

[0088] Specifically, a threaded section is provided at the lower end of the vertical rod 2-36, and a threaded hole is provided on the connecting block 2-331.

[0089] The collecting barrel 5-1 is used to collect particles dropped from the filter element 2-32 from below. Since the lower end of the vertical rod 2-36 is threadedly fixed to the connecting block 2-331 on the inner wall of the air inlet pipe 2-33, it is a detachable connection. Therefore, after taking out the old filter element when replacing the filter element, the vertical rod 2-36 and the connecting block 2-331 can be loosened and separated, and the vertical rod 2-36 and the collecting barrel 5-1 can be taken out of the shell 2-31 as a whole. After the particles in the collecting barrel 5-1 are poured out and cleaned externally, it can be reinstalled and continued to be used. Cleaning and maintenance are extremely simple (compared to the existing cleaning of the bottom of the shell).

[0090] Since the outer diameter of the collecting barrel 5-1 is smaller than the smallest inner diameter of the positioning tube 2-37, the collecting barrel 5-1 can move in and out freely when being taken out and put in again without being blocked, which is very smooth and can meet the rationality requirements.

[0091] Furthermore, a first ring baffle 5-2 is fixedly provided on the upper end of the inner wall of the collecting barrel 5-1, and the first ring baffle 5-2 is radially inclined downward toward the center direction of the vertical rod 2-36; a first gap H-1 is provided between the inner edge of the first ring baffle 5-2 and the outer wall of the vertical rod 2-36; a second ring baffle 5-3 is fixedly provided on the vertical rod 2-36, and the second ring baffle 5-3 is radially inclined downward toward the side wall of the collecting barrel 5-1; the middle part of the second ring baffle 5-3 is located directly below the inner edge of the first ring baffle 5-2 and there is a second gap H-2 between them; a third gap H-3 is provided between the outer edge of the second ring baffle 5-3 and the inner wall of the collecting barrel 5-1.

[0092] With the above-mentioned special structural design, the impurities falling from the filter element 2-32 fall onto the first ring baffle 5-2 on the collection barrel 5-1, and then slide down to the first gap H-1, then fall onto the second ring baffle 5-3, then slide down and pass through the second gap H-2, and finally enter the collection barrel 5-1 from the third gap H-3 to complete the collection and continuous accumulation. Since a special channel is formed between the first ring baffle 5-2 and the second ring baffle 5-3, the pressure airflow entering the intake pipe 2-33 will not act on the collection barrel 5-1, ensuring that the impurities collected in the collection barrel 5-1 will not be discharged upwards, especially for smaller impurities, expanding the range that can be collected, and effectively preventing the problem of dust interference of the airflow again.

[0093] Embodiment 5: This embodiment is a further improvement on the basis of embodiment 4, and is specifically as follows:

[0094] See also Figure 7-10Furthermore, a rotating sleeve 6-1 is rotatably mounted on the vertical pole 2-36, and the rotating sleeve 6-1 has blades 6-2; a frame 6-3 is fixedly mounted on the rotating sleeve 6-1, and two strip brushes 6-4 for cleaning the inside of the filter element 2-32 are symmetrically mounted on both sides of the frame 6-3. Since the gas enters from the lower end of the filter element 2-32 with a certain pressure, an upward airflow is generated, which drives the blades 6-2 to rotate. The rotating sleeve 6-1 will rotate on the vertical pole 2-36 and rotate through the frame 6-3 through the two strip brushes 6-4 symmetrical on both sides. The two strip brushes 6-4 rotate along the inner wall of the filter element 2-32 to clean the inside, and the fallen dust will fall into the collection bucket 5-1 and be collected without running out, which can realize automatic cleaning and automatic collection, greatly extending the working life of the filter element 2-32, and also greatly reducing the clogging problem.

[0095] Specifically, the rotating sleeve 6-1 is connected to the vertical rod 2-36 through a bearing 6-6 to achieve rotatable cooperation.

[0096] Furthermore, two lugs 6-31 are provided at both ends of the frame 6-3, which are symmetrical and spaced apart; two smooth rods 6-5 are movably mounted on the two lugs 6-31; the inner ends of the two smooth rods 6-5 are provided with a stopper 6-51 with an enlarged shape; the outer ends of the two smooth rods 6-5 are fixedly connected to the strip brush 6-4. Specifically, when the frame 6-3 rotates with the rotating sleeve 6-1 and the blade 6-2, the strip brush 6-4 and the frame 6-3 can be relatively slidably connected, and guided by the two smooth rods 6-5.

[0097] Since the shape of the stopper 6-51 becomes larger, the smooth rod 6-5 will be limited in travel when it is mounted on the lug 6-31 and will not fall off each other, thereby ensuring normal movement. Specifically, the lug 6-31 is provided with a sliding hole that slides with the smooth rod 6-5. However, the stopper 6-51 is too large to pass through the sliding hole.

[0098] Compared with the conventional strip brush 6-4 which is fixed and can only just contact (the matching state is consistent), the above-mentioned structural design is adopted. Since the strip brush 6-4 is slidably matched with the two lugs 6-31 on the frame 6-3 through two smooth rods 6-5, and the strip brush 6-4 will be subjected to the centrifugal force when the frame 6-3 rotates, the two smooth rods 6-5 automatically radially toward the inner wall of the filter element 2-32 and slide centrifugally outward relative to the frame 6-3, so that the strip brush 6-4 produces a certain contact pressure (i.e., brush force) on the inner wall of the filter element 2-32, thereby improving the cleaning ability; in addition, when the strip brush 6-4 rotates for cleaning, the brush force and speed will increase in positive correlation with the increase of the gas flow pressure and flow rate. The greater the ventilation volume entering the filter element, the greater the filtration volume, and the more dust, the greater the brush force and speed generated by the strip brush 6-4. Therefore, through the above-mentioned structure, automatic adjustment with the gas flow rate and air pressure can be achieved.

[0099] In addition, when the thickness of dust attached to the inner wall of the filter element 2-32 increases continuously, the radial position of the strip brush 6-4 can also be adjusted to adapt to the change, thereby preventing the problem of damage caused by the conventional strip brush 6-4 being fixed in radial position.

[0100] Embodiment 6: This embodiment is a further improvement on the above embodiments 3-5, and is specifically as follows:

[0101] See also Figure 11-12 , further, it also includes a liner ring 7; the liner ring 7 is arranged between the inner wall of the housing 2-31 and the filter element 2-32 and is limitedly supported by the positioning tube 2-37; the cross section of the liner ring 7 is U-shaped, and the bottom wall of the liner ring 7 is provided with a mesh 7-1. When the broken pieces falling from the outside of the filter element 2-32 will fall into the filter element 2-32 and be collected, when the filter element is replaced, the liner ring 7 can also be taken out, cleaned and then reinstalled, and there is no need to clean the bottom of the housing 2-31, which is more convenient.

[0102] Furthermore, the aperture of the mesh 7-1 is 1-2 mm.

[0103] Embodiment 7: This embodiment is further improved on the basis of the above embodiments 3-6, and is specifically as follows:

[0104] See also Figure 2A bent rod 8-1 is fixedly provided on the outside of the shell 2-31, and the upper section of the bent rod 8-2 extends horizontally to the top of the top cover 2-35. A threaded rod 8-2 is vertically installed on the upper section of the bent rod 8-2. A hand wheel 8-3 is fixedly provided on the upper end of the threaded rod 8-2, and a hook 8-4 is fixedly provided on the lower end of the threaded rod 8-2. A lifting ring 8-5 is provided at the center of the top surface of the top cover 2-35; the lifting hook 8-4 hooks the lifting ring 8-5. When the top cover 2-35 needs to be opened, first loosen the fixing bolt 3-51 on the top cover 2-35, and then rotate the hand wheel 8-3 to make the threaded rod 8-2 rotate upward, and the lifting hook 8-4 will drive the lifting ring 8-5 to move upward, thereby safely opening the top cover 2-35 upward.

[0105] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A gas pipeline system, comprising a gas transmission main pipe (1) and a buffer tank (3), characterized in that: The gas transmission main pipe (1) is connected to the buffer tank (3) via two branch units arranged in parallel; The two branch units each comprise a branch pipe (2-1), an upstream valve (2-2), a filter (2-3), an exhaust pipe (2-4), a downstream valve (2-5), a differential pressure sensor (2-7) for detecting the differential pressure between the inlet and outlet of the filter (2-3), and an air pressure sensor (2-8) for detecting the air pressure in the inner cavity of the filter (2-3); the upstream valve (2-2), the filter (2-3), the exhaust pipe (2-4) and the downstream valve (2-5) are sequentially arranged on the branch pipe (2-1); the exhaust pipe (2-4) is provided with an exhaust valve (2-6); and the differential pressure sensor (2-7) and the air pressure sensor (2-8) are both electrically connected to a controller (4).

2. A gas pipeline system according to claim 1, characterized in that: The filter (2-3) comprises a housing (2-31), a filter element (2-32), an air inlet pipe (2-33), an air outlet pipe (2-34), a top cover (2-35) and a vertical rod (2-36); the top cover (2-35) is detachably fixed to the upper cover of the housing (2-31); the air inlet pipe (2-33) and the air outlet pipe (2-34) are arranged on the housing (2-31); the outer end of the air inlet pipe (2-33) is connected to the upstream valve (2-2); ... ) is provided with a positioning tube (2-37) at the inner end, and the lower end of the filter element (2-32) is vertically inserted into the step hole (2-371) of the positioning tube (2-37); the lower end of the vertical rod (2-36) passes through the positioning tube (2-37) and is fixedly connected to the inner wall of the air inlet pipe (2-33); the upper end of the vertical rod (2-36) is detachably fixed with a pressure cover (2-38) for pressing the filter element (2-32); the inner end of the air outlet pipe (2-34) is connected to the inner cavity of the shell (2-31).

3. A gas pipeline system according to claim 2, characterized in that: The upper end of the vertical rod (2-36) is provided with an external thread; the upper end of the vertical rod (2-36) passes through the center hole of the pressure cover (2-38) upwards and is connected with the nut (2-39).

4. A gas pipeline system according to claim 2, characterized in that: The bottom of the shell (2-31) is externally connected to a sewage discharge pipe (2-311), and a sewage discharge valve (2-312) is arranged on the sewage discharge pipe (2-311).

5. A gas pipeline system according to claim 2, characterized in that: A collecting bucket (5-1) is fixedly arranged on the vertical pole (2-36), the collecting bucket (5-1) is located directly below the positioning tube (2-37), and the outer diameter of the collecting bucket (5-1) is smaller than the smallest inner diameter of the positioning tube (2-37); The inner wall of the air inlet pipe (2-33) is fixedly provided with a connecting block (2-331), and the lower end of the vertical rod (2-36) is threadedly connected to the connecting block (2-331) so as to be detachably fixed.

6. A gas pipeline system according to claim 5, characterized in that: A first ring baffle (5-2) is fixedly disposed at the upper end of the inner wall of the collecting barrel (5-1), and the first ring baffle (5-2) is arranged to be inclined downwardly toward the center direction of the vertical rod (2-36) in the radial direction; a first gap (H-1) is provided between the inner edge of the first ring baffle (5-2) and the outer wall of the vertical rod (2-36); A second ring baffle (5-3) is fixedly provided on the vertical rod (2-36), and the second ring baffle (5-3) is arranged to be tilted downward in the radial direction toward the side wall of the collecting barrel (5-1); the middle part of the second ring baffle (5-3) is located directly below the inner edge of the first ring baffle (5-2) and there is a second gap (H-2) between them; and there is a third gap (H-3) between the outer edge of the second ring baffle (5-3) and the inner wall of the collecting barrel (5-1).

7. A gas pipeline system according to claim 5 or 6, characterized in that: A rotating sleeve (6-1) is rotatably mounted on the vertical rod (2-36), and the rotating sleeve (6-1) has blades (6-2); a frame (6-3) is fixedly mounted on the rotating sleeve (6-1), and two strip brushes (6-4) for cleaning the inside of the filter element (2-32) are symmetrically mounted on both side ends of the frame (6-3).

8. A gas pipeline system according to claim 7, characterized in that: Two lugs (6-31) are provided at both side ends of the frame (6-3) and are symmetrical up and down and spaced apart. Two smooth rods (6-5) are movably mounted on the two lugs (6-31); the inner ends of the two smooth rods (6-5) are provided with a stopper (6-51) with an enlarged shape; and the outer ends of the two smooth rods (6-5) are fixedly connected to the strip brush (6-4).

9. A gas pipeline system according to any one of claims 2 to 7, characterized in that: It also includes a liner ring (7); the liner ring (7) is arranged between the inner wall of the shell (2-31) and the filter element (2-32) and is limitedly supported by the positioning tube (2-37); the cross-section of the liner ring (7) is U-shaped, and the bottom wall of the liner ring (7) is provided with a mesh (7-1).

10. A gas pipeline system according to claim 9, characterized in that: The aperture of the mesh (7-1) is 1-2 mm.

11. A fault analysis and processing method, characterized in that: The steps include: S1, collecting the differential pressure value △P1 between the inlet and outlet of the filter (2-3) in real time through the differential pressure sensor (2-7), and issuing a fault prompt when the collected differential pressure value △P1 is greater than a preset differential pressure threshold △P0; S2, first close the upstream valve (2-2) and the downstream valve (2-3) and obtain the first air pressure Pn1 of the inner cavity of the filter (2-3) collected by the air pressure sensor (2-8) at this time; then wait for a time T and then obtain the second air pressure Pn2 of the inner cavity of the filter (2-3) collected by the air pressure sensor (2-8) at this time; S3. Fault diagnosis: When the second air pressure Pn2 is less than the first air pressure Pn1, it is determined that the filter (2-3) is leaking, and then processing is performed according to step S4; When the second air pressure Pn2 is equal to or greater than the first air pressure Pn1, it is determined that the filter (2-3) is clogged, and then processing is performed according to step S5; S4. When a gas leak is detected in one of the branch units (2), the other branch unit (2) still maintains normal operation. The following operations only need to be performed on the branch unit (2) with the gas leak: First, close the upstream valve (2-2) and the downstream valve (2-5) on the branch pipe (2-1), then open the drain valve (2-6) to drain the gas in the filter (2-3), until the gas pressure value collected by the gas pressure sensor (2-8) drops to a preset safety pressure value, then find the gas leakage location on the filter (2-3) and repair it; when the treatment is completed, close the drain valve (2-6), then open the upstream valve (2-2) and the downstream valve (2-5); S5. When it is detected that the filter element of one of the branch units (2) is clogged, the other branch unit (2) still maintains normal operation. Only the following operations need to be performed on the branch unit (2) with the clogged filter element: First, the upstream valve (2-2) and the downstream valve (2-5) on the branch pipe (2-1) are closed; then, the drain valve (2-6) is opened to drain the gas in the filter (2-3) until the air pressure value collected by the air pressure sensor (2-8) drops to a preset safety air pressure value, and then the filter element (2-32) in the filter (2-3) is replaced; when the filter element is replaced, the drain valve (2-6) is closed first, and then the upstream valve (2-2) and the downstream valve (2-5) are opened.

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