Portable integrated pipeline ventilation device and ventilation method

Abstract

The invention relates to the technical field of pipeline operation equipment, in particular to a portable integrated pipeline ventilation device and a ventilation method. The device comprises a fan moving supporting frame, an axial flow fan is fixedly connected to the middle of the fan moving supporting frame, and the fan moving supporting frame can carry the axial flow fan to move to the position above an inspection well and embed the axial flow fan into an inspection well shaft. The ventilation method comprises the steps of preparing a basic tool, checking the state of water flow in the pipeline, arranging the portable integrated pipeline ventilation device, checking the content of harmful gas and the concentration of oxygen in the pipeline, guarding by a specially-assigned person, and closing the inspection well farthest from the descending working well. The pressure-equalizing water supply characteristic of the'water segregator 'is reversely utilized, and it is guaranteed that fresh air preferentially enters the environment of operating personnel through negative pressure suction. The ventilation equipment is convenient to mount and move, can improve the operation efficiency, and is suitable for dredging and maintenance safety ventilation operation of continuous underground pipelines, pipe ditches and limited spaces.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline operation equipment, and particularly relates to a portable integrated pipeline ventilation device and a ventilation method. Background Art

[0002] In recent years, there have been many maintenance operations for underground pipelines. Due to the lack of the concept of safe ventilation, a certain number of casualties have occurred. Due to the limited space and relatively closed environment in underground pipelines, especially in drainage pipelines, a large amount of toxic and harmful gases are generated. The poor ventilation makes the environment in the well or pipeline operation extremely bad, affecting the safety of personnel.

[0003] With the increase in safety awareness, some places adopt ground ventilation facilities and ventilate in advance before operation, which can improve the safety of working in the well. However, the existing equipment has simple ventilation, non-standard operation, poor ventilation efficiency, and inconvenient movement, which affects its popularization and use.

[0004] Therefore, the present application designs a portable integrated pipeline ventilation device and a ventilation method to solve the above problems. Summary of the Invention

[0005] The present invention provides a portable integrated pipeline ventilation device and a ventilation method to make up for the deficiencies in the prior art.

[0006] A portable integrated pipeline ventilation device includes a fan mobile support frame, and is characterized in that: An axial flow fan is fixedly connected in the middle of the fan mobile support frame. The fan mobile support frame can carry the axial flow fan and move it above the inspection well, and embed the axial flow fan into the inspection wellbore.

[0007] Further, to better implement the present invention, an anti-slip handle is installed at the end of the fan mobile support frame, and a detachable roller is installed at the other end of the fan mobile support frame.

[0008] Further, to better implement the present invention, the lower part of the fan mobile support frame adopts a 4-point fixing method, which is realized by hinging two folding legs and fixing two fixed legs. The height after the folding legs are supported is less than the protruding height of the axial flow fan.

[0009] Further, to better implement the present invention, a diversion sealing cylinder is provided at the part where the bottom of the axial flow fan protrudes from the fan mobile support frame, and the diversion sealing cylinder is embedded into the inner wall of the inspection wellbore.

[0010] Based on the above portable integrated pipeline ventilation device, the specific ventilation method is as follows: S1, Prepare basic tools and continuously open 3 - 4 inspection wells near the adjacent manhole for workers along the water flow direction; S2. Check the water flow state and water depth in the pipeline, confirm the water flow state and water depth, and use a gas detector to detect the concentration, content of harmful gases and oxygen content in the underground pipeline; S3. Arrange a portable integrated pipeline ventilation device above the inspection well at the downstream of the water flow direction of the manhole. Connect the power supply and turn on the axial flow fan. Exhaust the harmful gases from this inspection well through negative pressure extraction, and fresh air enters from several inspection well openings at the upstream of the water flow direction and flows through the working position of the staff at the manhole; S4. After 30 minutes of ventilation, check the content of harmful gases and oxygen concentration in the pipeline. When the content of harmful gases is lower than the specified value and the oxygen concentration is higher than the minimum limit, personnel can enter the manhole for work. Otherwise, continue ventilation and air exchange; S5. During the work in the well, special personnel should be on duty at the personnel work well and the layout well of the portable integrated pipeline ventilation device to ensure continuous ventilation of the ventilation equipment without interruption; S6. During continuous pipeline ventilation operation, when adjusting the operation well, it should be adjusted continuously and sequentially. Close the inspection well farthest from the manhole, newly open the inspection well at the downstream of the water flow direction of the new manhole and repeat the ventilation operations of S3 - S5 to ensure sufficient fresh air volume and operation safety for the operators.

[0011] The beneficial effects of the present invention are as follows: The present invention reversely utilizes the equal - pressure water supply characteristic of the "water distributor": by using negative pressure suction, it ensures that fresh air enters the operator's environment first. The ventilation equipment of the present invention is convenient to install and move, can improve the operation efficiency, and is applicable to continuous underground pipelines, pipe trenches, confined spaces, dredging, and maintenance safety ventilation operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is the first three - dimensional structure schematic diagram of the portable integrated pipeline ventilation device of the present invention; Figure 2 It is the second three - dimensional structure schematic diagram of the portable integrated pipeline ventilation device of the present invention; Figure 3 It is the schematic ventilation flow diagram of the present invention.

[0013] In the figure, 1. Fan mobile support frame, 2. Axial flow fan, 201. Flow - guiding sealing cylinder, 3. Roller, 4. Anti - slip handle, 5. Folding support leg, 6. Fixed support leg. DETAILED DESCRIPTION OF THE INVENTION

[0014] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Generally, the components of the embodiments of the present invention described and illustrated herein can be arranged and designed in various different configurations.

[0015] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0016] Figures 1 - 3 For a specific embodiment of the present invention, this embodiment draws on the characteristics of pipeline ventilation, uses an inspection well built into the ventilation equipment to improve ventilation efficiency, and reduce air volume loss. Most traditional ventilation equipment uses positive pressure air supply. Due to positive pressure air supply, the wind pressure loss is relatively fast, and fresh air does not preferentially pass through the maintenance management personnel, which is not conducive to providing an excellent ventilation environment. Affected by the special underground environment, this embodiment considers using negative pressure air supply. Using the principle of negative pressure suction, it diverts the clean air on the ground to preferentially enter the inspection well of the operators, and the dirty air is sucked out through the fan wellhead. The fresh air enters the pipeline to improve the pipeline ventilation efficiency, reduce the dead corners of air change, and at the same time, reversely utilize the principle of equal pressure water distribution of the "water distributor", and introduce fresh air with multi-point equal pressure into the pipeline, which can increase the proportion of fresh air in the underground pipeline, increase the oxygen content, and reduce the concentration of harmful gases.

[0017] As Figure 1 、 Figure 2 shown, the axial flow fan in this embodiment selects a traditional axial flow explosion-proof fan, and the hourly ventilation volume is not less than 12 times the air change rate of the underground pipeline space, and is not less than 3000 cubic meters per hour. The fan pressure is not less than 100 Pa, and the wind speed in the pipeline is not less than 1 m / s. Ensure sufficient flow of fresh air in the pipeline.

[0018] To facilitate the movement of the equipment, a detachable roller assembly is installed at the bottom of the device. The roller diameter is designed with rollers of 15 - 20 cm.

[0019] To facilitate operation and movement, the width of the device is designed to be 70 cm, and the length is 140 - 170 cm, which is matched with the size of the inspection well. The outer diameter of the axial flow fan is between 400 - 450 mm, which is convenient for being built into the inspection well.

[0020] To improve the ventilation efficiency and reduce the air leakage rate, the fan is fixed on the moving device eccentrically and built into the inspection well, which is convenient for reducing the air leakage rate of the fan and improving the fan efficiency during operation.

[0021] To facilitate the fixation of the ventilation device, the device adopts a 4-point fixation method. The distance between the same-side support points is 1000 cm, which is greater than the inspection wellhead. The bottom support points adopt foldable legs to facilitate the movement of the device without scratching or dragging.

[0022] To facilitate mobile operation, anti-slip handles are installed at the end of the device for easy pulling and pushing.

[0023] As Figure 3 shown, this embodiment adopts "four-point" ventilation. Along the water flow direction of the pipeline, 4 inspection wells are continuously opened. The negative pressure suction ventilation device is installed at the No. 4 wellhead. Wells 1, 2, and 3 are air inlet wells, and well 3 is the well for personnel to enter the well for operation. By using negative pressure suction, the existing air in the pipeline is diluted, fresh air is supplemented, and fresh air is preferentially guaranteed to enter the personnel operation area to ensure personnel safety and provide a good air environment.

[0024] The specific working process is as follows: The first step: Prepare basic tools and continuously open 3-4 adjacent inspection wells along the water flow direction.

[0025] The second step: Check the water flow state and water depth in the pipeline, confirm the water flow state and water depth, and use a gas detector to detect the concentration and content of harmful gases and the oxygen content in the underground pipeline.

[0026] The third step: Arrange a mobile portable ventilation device at the No. 4 well, connect the power supply and turn on the negative pressure axial flow induced draft fan at the No. 4 well for ventilation and air change.

[0027] The fourth step: After 30 minutes of ventilation, check the content of harmful gases and the oxygen concentration in the pipeline. When the content of harmful gases is lower than the specified value and the oxygen concentration is higher than the minimum limit, the well No. 3 is operated for personnel to enter the well for work. Otherwise, continue ventilation and air change.

[0028] The fifth step: During the operation of entering the well, special personnel should be on duty at the personnel operation well and the well where the ventilation device is arranged. Ensure that the ventilation equipment continues to ventilate without interruption.

[0029] The sixth step: During continuous pipeline ventilation operations, when adjusting the operation wells, they should be adjusted continuously and sequentially. Close: Well No. 1, newly open "Well No. 4" and repeat the ventilation operations in the third to fifth steps to ensure sufficient fresh air and safe operation for the operators.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limitations. Other modifications or equivalent replacements made by those of ordinary skill in the art to the technical solutions of the present invention should be covered within the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solutions of the present invention.

Claims

1. A portable integrated pipeline ventilation device, comprising a fan mobile support frame (1), characterized in that: An axial flow fan (2) is fixedly connected in the middle of the fan mobile support frame (1). The fan mobile support frame (1) can carry the axial flow fan (2) and move it above the inspection well, and embed the axial flow fan (2) into the inspection wellbore.

2. The portable integrated pipeline ventilation device according to claim 1, characterized in that: An anti-slip handle (4) is installed at the end of the fan mobile support frame (1), and a detachable roller (3) is installed at the other end of the fan mobile support frame (1).

3. The portable integrated pipeline ventilation device according to claim 1, characterized in that: The lower part of the fan mobile support frame (1) adopts a 4-point fixing method, which is realized by hinging two folding legs (5) and fixing two fixed legs (6). The height after the folding legs (5) are supported is less than the protruding height of the axial flow fan (2).

4. The portable integrated pipeline ventilation device according to claim 1, characterized in that: A diversion sealing cylinder (201) is provided at the part where the bottom of the axial flow fan (2) protrudes from the fan mobile support frame (1), and the diversion sealing cylinder (201) is embedded into the inner wall of the inspection wellbore.

5. A ventilation method, based on the portable integrated pipeline ventilation device according to any one of claims 1-4, characterized in that Including the following steps: S1. Prepare basic tools and continuously open 3-4 inspection wells near the adjacent manhole working well along the water flow direction; S2. Check the water flow state and water depth in the pipeline, confirm the water flow state and water depth, and use a gas detector to detect the concentration and content of harmful gases and the oxygen content in the underground pipeline; S3. Arrange the portable integrated pipeline ventilation device above the inspection well at the downstream of the water flow direction of the manhole working well, connect the power supply and turn on the axial flow fan (2), and discharge the waste gas from this inspection well through negative pressure extraction. Fresh air enters from the inspection well openings of several inspection wells upstream in the water flow direction and flows through the working position of the staff at the manhole working well; S4. After 30 minutes of ventilation, check the content of harmful gases and the oxygen concentration in the pipeline. When the content of harmful gases is lower than the specified value and the oxygen concentration is higher than the minimum limit, the manhole working well can be entered for work, otherwise continue ventilation and air change; S5. During the work of entering the well, special personnel should be on duty at the personnel working well and the layout well of the portable integrated pipeline ventilation device to ensure continuous ventilation of the ventilation equipment without interruption; S6. During continuous pipeline ventilation operation, when adjusting the operation well, it should be adjusted continuously in sequence. Close the inspection well farthest from the manhole working well, newly open the inspection well at the downstream of the water flow direction of the new manhole working well and repeat the ventilation operations in S3-S5 to ensure sufficient fresh air volume and safe operation for the operators.

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