Intelligent start-stop device for liquid level of pneumatic diaphragm pump

Abstract

The utility model discloses an intelligent liquid level start-stop device for a pneumatic diaphragm pump, and belongs to the technical field of fluid mechanical control. In order to solve the problems of poor explosive environment adaptability, complex control structure and the like of an existing pneumatic diaphragm pump adopting electrical control, a pure pneumatic control scheme based on air pressure interlocking is innovatively provided. The device structurally comprises a box body module, a main gas circuit control module, a liquid level sensing module and a gas pressure logic control module. The box body module is of an explosion-proof closed structure; the main gas circuit control module adopts a pneumatic control valve, a throttle valve and an operation handle extending out of the shell for control; the liquid level sensing module adopts a high-water-level floating ball assembly and a low-water-level floating ball assembly to realize water level sensing; the air pressure logic control module adopts a two-position five-way pneumatic control valve, a pipe fitting and other modules to realize air pressure logic control. Full-pneumatic elements are adopted to construct control logic, and liquid level interval self-adaptive control is achieved through an air pressure self-holding mechanism.

Description

Technical Field

[0001] This utility model relates to the field of pneumatic diaphragm pump control, specifically a pneumatic diaphragm pump liquid level intelligent start-stop device. Background Technology

[0002] Pneumatic diaphragm pumps are a new type of conveying machinery that uses compressed air as a power source. They can effectively pump out various corrosive liquids, liquids containing particles, and high-viscosity, volatile, flammable, and highly toxic liquids. As a novel type of pump, pneumatic diaphragm pumps are currently the most innovative pumps available in China. Powered by compressed air, they are suitable for various corrosive liquids. Due to their spark-free and corrosion-resistant characteristics, pneumatic diaphragm pumps are widely used in hazardous environments such as chemical and petroleum industries. Traditional liquid level control relies heavily on electrical components (such as solenoid valves and level sensors), which presents the following problems: insufficient explosion-proof performance: electrical components can easily pose safety hazards in flammable and explosive environments; complex control: additional controllers and circuit protection devices are required, resulting in low system integration; high energy consumption: frequent start-stop cycles lead to air pressure loss, and electrical components have a high failure rate over long-term operation. Therefore, there is an urgent need for a liquid level adaptive control scheme based on pure pneumatic components to solve these problems. Summary of the Invention

[0003] This invention addresses the shortcomings of existing technologies by proposing an intelligent start-stop device for a pneumatic diaphragm pump. Through mechanical displacement linkage with a pneumatically controlled valve assembly, it achieves liquid level range control and pump start-stop functionality. The specific solution is as follows:

[0004] System Composition: Box Module: Adopts explosion-proof enclosed structure, using four shell mounting holes and four box mounting holes for installation. The module includes an integrated aluminum alloy shell (1) and a detachable cover plate (2). The shell (1) is equipped with a standardized gas interface group, including a ball valve mounting hole (101) in the upper middle of the main view, a throttle valve mounting hole (102) on the lower right side of the ball valve mounting hole (101), and four holes on the bottom surface for quick-connect gas interfaces (103-106). The four holes on the bottom surface, from left to right, are the control system air inlet (103), the pump air control valve pilot interface (104), the high liquid level immersion pipe interface (105), and the low liquid level immersion pipe interface (106). Main air circuit control module: includes three-way ball valve (3), adjustable throttle valve (4), and air control valve (5); the three-way ball valve (3) is fixed inside the housing (1) by a narrow nut (7), and its operating handle extends to the outside, supporting manual start / stop and mode switching; the adjustable throttle valve (4) has its operating handle axially fixed inside and outside the housing (1) by a narrow nut (7), and the adjustment knob is used to adjust the main air circuit flow rate; the air control valve (5) is directly connected to the diaphragm pump main air circuit inlet through a quick-connect interface. Liquid level sensing module: It consists of a high-level float assembly (8), a low-level float assembly (9), and connecting pipes (11). The float is placed vertically in the liquid being measured. By detecting changes in the fluid level, it changes the on / off state of the air path. The normally open control signal port of the two-position five-way pneumatic control valve (6) detects the closed air pressure signal when the high-level float is closed through the air pipe assembly. The normally closed control signal port of the two-position five-way pneumatic control valve (6) detects the air path depressurization when the low-level float is opened through the air pipe assembly. Pneumatic pressure logic control module: The core is the two-position five-way pneumatic control valve (6). It is connected to the normally open control port to the output air path of the high-level float assembly through the air pipe connector assembly (12), and to the normally closed control port to the output air path of the low-level float assembly. The on / off state of the main air path is switched through the air pressure signal.

[0005] Working principle: Low level shutdown: When the liquid level is lower than the low level float assembly (9), its output air path is depressurized, the two-position five-way pneumatic control valve (6) switches to the normally closed position, the pneumatic control valve (5) is locked, and the pump stops running. High level start: When the liquid level rises to the high level float assembly (8), its air path is closed to form a pressure signal, which triggers the two-position five-way pneumatic control valve (6) to switch to the normally open position. The pneumatic control valve (5) opens and establishes working air pressure through the adjustable throttle valve (4), driving the diaphragm pump to run. Interval self-holding: When the liquid level is between the high and low levels, the two-position five-way pneumatic control valve (6) maintains the current state through air pressure self-holding to avoid frequent start and stop.

[0006] Beneficial effects: Intrinsically safe and explosion-proof: All pneumatic components eliminate the risk of electrical sparks, making it suitable for hazardous areas. Simplified structure: The elimination of the electrical controller and the implementation of logic control through mechanical-pneumatic linkage reduce the failure rate. Energy-efficient: The self-holding pneumatic mechanism reduces no-load air consumption, resulting in lower energy consumption compared to traditional solutions. Convenient maintenance: The modular design supports quick assembly and disassembly, and the quick-connect interfaces and standardized housing enhance compatibility. Attached Figure Description

[0007] Figure 1 This is a schematic diagram of the external structure of this utility model; Figure 2 This is a logic diagram of the gas path connection; Figure 3 This is the main view of the enclosure module; Figure 4 For the main view of the connection structure; Figure 5 The attached figure is for the abstract; the following are the labels: 1-shell, 2-removable cover plate, 3-three-way ball valve, 4-adjustable throttle valve, 5-pneumatic control valve, 6-two-position five-way pneumatic control valve, 7-narrow nut, 8-high water level float assembly, 9-low water level float assembly, 11-pipe fitting, 12-pneumatic pipe connector assembly, P0-connects to the control module air source, P1-connects to the pump air source, A-control module and output module air path, M-high water level air path, N-low water level air path. Detailed Implementation

[0008] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0009] Installation configuration: Fix the shell (1) near the pump body, and install the high water level float assembly (8) and the low water level float assembly (9) vertically in the tank through the immersion pipe. Set the high water level to 80% of the tank body and the low water level to 20%.

[0010] Gas connection: gas source is connected to the air inlet (103) of the control system; the pilot interface (104) of the pump control valve is connected to the control end of the control valve (5); the high / low liquid level immersion pipe interface (105 / 106) is connected to the gas path of the float assembly respectively.

[0011] Parameter adjustment: Adjust the working air pressure of the pump body to 0.4Mpa by turning the adjustable throttle valve (4).

[0012] Mode switching: When the handle of the three-way ball valve (3) is in the "automatic" position, the system enters the liquid level adaptive control state. When the liquid level reaches the high level, the pump body automatically starts to drain the liquid; after the liquid level drops to the low level, the pump body stops and remains in standby until the next high level signal is triggered.

[0013] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. This utility model is not limited to the above examples; all technical solutions formed by equivalent substitutions or equivalent transformations fall within the protection scope of this utility model.

Claims

1. A pneumatic diaphragm pump intelligent start / stop device for liquid level control, characterized in that: It includes a housing module, a main air circuit control module, a liquid level sensing module, and a pneumatic logic control module; the housing module adopts an explosion-proof enclosed structure, including an integrated aluminum alloy shell (1) and a detachable cover plate (2). The shell is provided with a standardized air circuit interface group, including a ball valve mounting hole (101), a throttle valve mounting hole (102), and multiple quick-connect air circuit connection ports (103-106). The main air circuit control module includes a three-way ball valve (3), an adjustable throttle valve (4), a pneumatic control valve (5), and fittings (11) and a pneumatic pipe connector assembly (12). The three-way ball valve (3) is installed inside the housing (1), and its operating handle extends to the outside of the housing and is fixed by a narrow nut (7). The adjustable throttle valve (4) is installed inside the housing (1), and its adjustment knob extends to the outside of the housing (1) and is fixed axially with the housing (1) by a narrow nut (7). The pneumatic control valve (5) is normally closed and is directly integrated into the main air circuit inlet of the diaphragm pump through a quick-connect interface. The liquid level sensing module includes a high water level float assembly (8), a low water level float assembly (9), and a pipe fitting (11). The high water level float assembly (8) and the low water level float assembly (9) are placed externally through the pipe fitting (11) to detect the liquid level of the fluid being measured. The pneumatic logic control module includes a two-position five-way pneumatic control valve (6). The normally open control signal port of the two-position five-way pneumatic control valve (6) is connected to the output air path of the high water level float assembly (8), and the normally closed control signal port is connected to the output air path of the low water level float assembly (9).

2. The intelligent start / stop device for a pneumatic diaphragm pump according to claim 1, characterized in that: The upper center hole of the main view of the housing module is the ball valve mounting hole (101), the lower right side of the ball valve mounting hole (101) is the throttle valve mounting hole (102), and the four holes on the bottom are quick-connect air circuit ports (103-106).

3. The intelligent start-stop device for liquid level control of a pneumatic diaphragm pump according to claim 1, characterized in that: The main air circuit control module is connected through a pipe fitting (11), and there is one narrow nut (7) inside and outside the housing (1) to form an axial fixation.

4. The intelligent start / stop device for liquid level control of a pneumatic diaphragm pump according to claim 1, characterized in that: The detachable cover plate (2) includes four housing mounting holes and four box mounting holes.

5. The intelligent start / stop device for a pneumatic diaphragm pump according to claim 2, characterized in that: The four quick-connect air circuit ports (103-106) are, from left to right, the pneumatic control system air inlet (103), the pump air control valve pilot interface (104), the high liquid level immersion pipe interface (105), and the low liquid level immersion pipe interface (106).

6. The intelligent start-stop device for liquid level control of a pneumatic diaphragm pump according to claim 1, characterized in that: The float is vertically placed into the liquid being measured, and the pneumatic pump is started and stopped by the pressure difference formed by the surface contact.

7. The intelligent start-stop device for liquid level control of a pneumatic diaphragm pump according to claim 1, characterized in that: The logic control module is connected to a three-way ball valve (3) via a gas pipe. Its operating handle can be used to manually start, stop, and automatically start the pump.

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