Semi-buried deep well pump house limited space automatic control ventilation method

Abstract

The application discloses a semi-buried deep well pump house limited space self-control ventilation method, and has the characteristics that the method comprises the following steps: a door lock opening and closing sensing device detects the opening and closing state of a first door lock, sends an electric control signal to an electrical system main control box, controls the starting of a ventilation equipment, and waits for a gas detection device to detect the air condition of the lower limited space; after maintaining the ventilation state for 20 minutes, the ventilation equipment stops running, if the toxic and harmful gas in the limited space exceeds a fixed dangerous value, an alarm buzzer sounds an alarm sound and a warning light flashes, and the safety door cannot be opened, if no toxic and harmful gas is detected in the limited space, the safety door is automatically unlocked to allow workers to enter the limited space to work. The application has the beneficial effect of avoiding the danger that may be caused by manually carrying an air detection instrument into the limited space, and greatly improves the safety guarantee when workers enter the work site.

Description

Technical Field

[0001] This invention relates to the field of deep well pump rooms, and more particularly to a method for self-controlled ventilation in a confined space of a semi-buried deep well pump room. Background Technology

[0002] The original deep well pump room ventilation system was manually operated. When workers entered the confined space, they often neglected to turn on the fans in advance for ventilation or to detect toxic and harmful gases, which could easily lead to poisoning or suffocation accidents.

[0003] Chinese invention patent publication number CN110805988A discloses a ventilation device for improving air quality in a pumping station, including a pumping station and an automatic ventilation control system. The pumping station includes a pump house, a water pump, and a ventilation mechanism. The pump house has a maintenance platform inside, and the water pump is fixedly mounted on the surface of the maintenance platform. The ventilation mechanism includes an air inlet pipe, an air outlet pipe, and an air outlet plate. The air outlet plate has a cavity and several air outlet holes inside, and is fixedly mounted at the top of the pump house. The cavity on the surface of the air outlet plate is connected to the air inlet pipe. The air outlet pipe passes through the pump house and the air outlet plate, and its bottom end corresponds to the maintenance platform. This ventilation device requires separate air inlet and outlet pipes for air intake and exhaust, resulting in high construction costs. Toxic and harmful gases are generally lighter than air and float above the pump house; this ventilation device cannot effectively remove toxic and harmful gases from the pump house. Summary of the Invention

[0004] The technical problem to be solved by the present invention is that the existing ventilation equipment for semi-buried deep well pump rooms is not effective in expelling toxic and harmful gases, and personnel safety cannot be guaranteed. To this end, a self-controlled ventilation method for confined spaces in semi-buried deep well pump rooms is provided.

[0005] The technical solution of this invention is: a self-controlled ventilation method for a confined space in a semi-buried deep well pump room, comprising the following steps: a door lock opening and closing sensor detects the opening and closing status of the first door lock, sends an electrical control signal to the main control box of the electrical system, controls the ventilation equipment to start, and waits for the gas detection device to detect the air condition in the confined space below; after maintaining ventilation for 20 minutes, the fan stops running, and if the alarm does not sound, entry is permitted; if the toxic or harmful gas in the confined space exceeds a fixed danger value, the alarm buzzer sounds and the warning light flashes to remind the workers that the air condition in the confined space below is at a dangerous level, and the safety door cannot be opened; if no toxic or harmful gas is detected in the confined space, the safety door automatically unlocks, allowing workers to enter the confined space for work.

[0006] The ventilation equipment includes: a fan; an exhaust fan; an air supply duct, one end of which is connected in parallel with the fan and exhaust fan, and the other end of which extends downward along the wall of the confined space to the deepest part of the confined space; the air supply duct includes a vertical section and a horizontal section; a longitudinal opening, which is located on the vertical section; an air intake hood, which includes an opening and a base, the base of which is slidably fitted within the longitudinal opening; a lower stop block, which is fixedly connected within the vertical section and located below the longitudinal opening; a spring, which is fixedly connected between the bottom of the lower stop block and the base; a cavity, which extends vertically within the vertical section and is connected to the base on one side; an upper air intake, which is located at the top of the cavity; a lower air intake, which is located at the bottom of the cavity; and an upper stop block, which is fixedly connected within the vertical section and located opposite the longitudinal opening; the horizontal cross-section of the upper stop block is larger than the horizontal cross-section of the cavity, and the upper air intake is offset from the upper stop block.

[0007] An improvement to the above solution is that an opening groove is provided on the opposite side of the cavity from the root.

[0008] The air supply duct described in the above scheme is connected to the fan and exhaust fan via a tee.

[0009] The air intake hood described in the above scheme is a curved shape that tapers from the hood opening towards the base.

[0010] The beneficial effects of this invention are that it avoids the potential dangers of manually carrying air detection instruments into confined spaces, greatly improving the safety of workers entering the workplace; the ventilation equipment utilizes an air supply duct to integrate the functions of air supply and exhaust, and the air intake hood is located above the confined space, which can effectively extract toxic and harmful gases. At the same time, the fresh air supplied by the air supply duct spreads from the bottom to the top of the confined space, realizing vertical convection within the confined space and accelerating the gas renewal within the confined space. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the semi-buried deep well pump room confined space self-controlled ventilation device of the present invention;

[0012] Figure 2 yes Figure 1 A schematic diagram of the ventilation equipment in the diagram;

[0013] Figure 3 yes Figure 2 Schematic diagram of the cross-section of the middle vertical section;

[0014] Figure 4 yes Figure 2 Schematic diagram of the middle cavity;

[0015] In the diagram, 1. Alarm warning device, 2. Door lock opening and closing sensor, 3. Electrical system main control box, 4. Fan, 5. Gas detection device, 6. Air supply duct, 7. Suction hood, 8. Lower stop block, 9. Spring, 10. Cavity, 11. Upper air hole, 12. Upper stop block, 13. Opening slot. Implementation

[0016] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments implemented by those skilled in the art without creative effort are within the protection scope of the present invention.

[0017] like Figure 1 As shown, the confined space self-controlled ventilation method of the present invention differs from previous active, manually operated ventilation systems. The door lock opening / closing sensor 2 detects the opening / closing status of the first door lock and sends an electrical control signal to the main control box 3 of the electrical system to control the ventilation equipment to start. The ventilation equipment automatically stops operating after 20 minutes of ventilation. When the ventilation equipment starts, it ventilates the confined space. Simultaneously, the gas detection device 5 inside the confined space detects the air conditions. If the concentration of toxic or harmful gases in the confined space exceeds a fixed danger level, an alarm buzzer sounds and a warning light flashes to alert the workers. If the air conditions in the lower confined space are at a dangerous level, the safety door cannot be opened for entry. If no toxic or harmful gases are detected in the confined space, the safety door automatically unlocks, allowing workers to enter the confined space for operations.

[0018] like Figure 2-4 As shown, the ventilation equipment includes: a fan 4; an exhaust fan; an air supply duct 6, one end of which is connected in parallel with the fan and exhaust fan, and the other end of which extends downward along the wall of the confined space to the deepest part of the confined space; the air supply duct includes a vertical section and a horizontal section; a longitudinal opening, which is opened on the vertical section; an air intake hood 7, which includes an opening and a base, the base being slidably fitted within the longitudinal opening; a lower stop block 8, which is fixedly connected within the vertical section and located below the longitudinal opening; a spring 9, which is fixedly connected between the bottom of the lower stop block and the base; a cavity 10, which extends vertically within the vertical section and is connected to the base on one side; an upper air hole 11, which is opened at the top of the cavity; a lower air hole, which is opened at the bottom of the cavity; and an upper stop block 12, which is fixedly connected within the vertical section and located opposite the longitudinal opening; the horizontal cross-section of the upper stop block is larger than the horizontal cross-section of the cavity, and the upper air hole is offset from the upper stop block.

[0019] When using ventilation equipment, first connect the fan to the air supply duct. Fresh air enters the vertical section, blowing the cavity downwards along the longitudinal opening, gradually moving away from the upper baffle. Fresh air enters the horizontal section between the upper baffle and the cavity, and finally exits from the end of the air supply duct into the deepest part of the confined space, gradually spreading upwards. After the fan has been running for 10 minutes, stop the fan and connect the exhaust fan to the air supply duct. The exhaust fan will then operate, with the spring providing an upward thrust to the cavity. Simultaneously, an upward negative pressure is generated in the vertical section, causing the cavity to contact the upper baffle, exposing the upper air vent. This upper air vent connects to the suction hood, sucking in toxic and harmful gases from above the confined space. This process can be repeated multiple times until the gas detection device detects no toxic or harmful gases, and the alarm and buzzer stop working and the warning lights do not flash. Only then can the work area be entered for operation. After all work is completed and all personnel have evacuated the confined space, the on-site safety officer will count the number of workers to ensure that all personnel have evacuated the confined space. Closing the gate triggers the shutdown of the ventilation system, alarm, and gas detection device, completing the entire operation process.

[0020] In a preferred embodiment of the present invention, an opening groove 13 is provided on the opposite side of the cavity from the root. The design of the opening groove can increase the contact area between the fresh air and the cavity when it passes through, thereby increasing the suction volume.

[0021] The air supply duct is connected to the fan and exhaust fan via a tee. Alternatively, it can be connected via a Y-shaped duct.

[0022] To enhance the suction effect, the suction hood is curved, tapering from the opening towards the base.

[0023] The semi-buried deep well pump house confined space self-controlled ventilation system includes an alarm and warning device, a door lock opening and closing sensor, an electrical system main control box, a fan, air supply ducts, and a gas detection device. The alarm and warning device is installed on the ground floor, the door lock opening and closing sensor is installed on the door at ground level, the fan and the electrical system main control box are installed on the wall at ground level, and the air supply duct extends downwards from the wall at ground level to the deepest point of the underground section. The gas detection device is installed on the ceiling wall of the underground section.

Claims

1. A method for self-control ventilation of a limited space of a semi-buried deep-well pump house, characterized in that: The method comprises the following steps: The door lock opening and closing sensing device detects the first door lock opening and closing state, sends an electric control signal to the electrical system main control box, controls the ventilation equipment to start, and waits for the gas detection device to detect the air condition of the lower limited space; after maintaining the ventilation state for 20 minutes, the ventilation equipment stops running, the alarm does not alarm, and the personnel can enter, if the toxic and harmful gas in the limited space exceeds the fixed dangerous value, the alarm buzzer sounds the alarm sound and the warning light flashes to remind the personnel, the air condition of the lower limited space is in the dangerous value, and the safety door cannot be opened, if the toxic and harmful gas in the limited space is not detected, the safety door is automatically unlocked to allow the personnel to enter the limited space to work; The ventilation equipment comprises a fan, an air extractor, and an air supply pipeline, one end of the air supply pipeline is connected with the fan and the air extractor in parallel, the other end of the fan extends downward along the wall of the limited space to the deepest part of the limited space, the air supply pipeline comprises a vertical section and a horizontal section, a longitudinal opening is arranged on the vertical section, an air suction cover comprises a cover opening and a root, the root is slidingly fitted in the longitudinal opening, a lower stop block is fixedly connected in the vertical section and located below the longitudinal opening, a spring is fixedly connected between the lower stop block and the bottom of the root, a cavity extends in the vertical direction in the vertical section and communicates with the root on one side, an upper air hole is arranged on the top of the cavity, a lower air hole is arranged on the bottom of the cavity, an upper stop block is fixedly connected in the vertical section and located on the opposite side of the longitudinal opening, the horizontal section of the upper stop block is larger than that of the cavity, and the upper air hole is staggered with the upper stop block.

2. The semi-buried deep-well pump house limited space automatic control ventilation method according to claim 1, characterized in that: The other side of the cavity opposite to the root is provided with an opening groove.

3. The semi-buried deep-well pump house limited space automatic control ventilation method according to claim 1, characterized in that: The air supply pipeline is communicated with the fan and the air extractor through a tee joint.

4. The semi-buried deep-well pump house limited space automatic control ventilation method according to claim 1, characterized in that: The air suction cover is in a curve type which is contracted from the cover opening to the root.

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