Air pressure type differential pressure liquid level meter

Abstract

The utility model relates to an air pressure type differential pressure liquid level meter which comprises a flange plate, one side of the flange plate is connected with an air holding barrel, the other end of the air holding barrel is open, the air holding barrel is vertically arranged when installed, the open end of the air holding barrel is downwards arranged and used for being communicated with a liquid level in a contact mode, and the air holding barrel and the flange plate are concentrically arranged. During use, when the liquid level in the container rises, liquid enters the suffocation barrel from the open end, the pressure difference of an inner cavity of the suffocation barrel is changed, the pressure difference is transmitted to the pressure difference induction switch, and the suffocation barrel is driven to rotate by the pressure difference induction switch. The pressure difference sensing switch is used for measuring a pressure difference change value in the suffocation barrel, converting the pressure difference change value into a liquid level value of an inner cavity of the suffocation barrel and displaying the liquid level in the suffocation barrel. According to the air pressure type differential pressure liquid level meter, the change of the detection liquid level is converted through the change of the differential pressure generated by the rising and falling of the liquid level in the air holding barrel, and the detection precision error caused by the adsorption of dirt on the inner wall is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid level detection, in particular to a pneumatic differential pressure liquid level gauge. Background Art

[0002] The waste transfer station is equipped with a transition tank that connects to the vacuum sewage tank and transfers wastewater into it. There are two types of transition tanks: one is installed in the pipeline and acts as a transition filter for large waste in the sewage. It is in a vacuum state during suction. The other is used to temporarily store sewage. The sewage flows directly into the transition tank before being sucked out. It is similar to a puddle and is under normal pressure during suction.

[0003] The water level in the transition tank is monitored by a level gauge. When the liquid level reaches the maximum level, the drain port must be opened promptly to drain the wastewater into the tank. Dirt in the wastewater often adheres to the surface of the level gauge, affecting its sensing accuracy. Even though the tank's liquid level has not yet reached the maximum discharge level, the level gauge's surface is clinging to dirt, often causing false level readings. This can cause the vacuum discharge line connected to the drain port to open inadvertently, or, if already opened, fail to close in time, leading to empty pumping and disrupted system operation, and even malfunctioning of the wastewater storage system. Utility Model Content

[0004] The utility model aims to solve the problem in the prior art that conventional liquid level detection devices in storage tanks are easily adhered to the surface of the detection device, which affects the detection sensitivity. The utility model provides a pneumatic differential pressure level gauge, which detects the change of the liquid level by the change of the pressure difference between the rising and falling liquid levels in the sealed cavity of the detection device, thereby reducing the detection accuracy error caused by the adsorption of dirt on the inner wall.

[0005] The purpose of the present utility model is achieved as follows: a pneumatic differential pressure level gauge includes a flange, one side of the flange is connected to a gas-holding barrel, one end of the gas-holding barrel is connected to the flange, and the other end of the gas-holding barrel is open. When installed, the gas-holding barrel is vertically arranged and the open end is downwardly arranged for contact and communication with the liquid level. The gas-holding barrel and the flange are arranged concentrically. A trachea joint connected to the gas-holding barrel is fixed at the center of the flange, and the trachea joint is connected to a conduit. The other end of the conduit is connected to a pressure differential sensing switch. When in use, when the liquid level in the container rises, liquid is introduced into the gas-holding barrel from the open end, causing the pressure differential in the gas-holding barrel to change and transmit it to the pressure differential sensing switch. The pressure differential sensing switch is used to measure the pressure differential change in the gas-holding barrel and convert it into a liquid level value in the gas-holding barrel for displaying the liquid level in the gas-holding barrel. To facilitate the detection of liquid fullness in the container and timely discharge, the pressure differential sensing switch is connected to the control component of the discharge pipeline of the detection container.

[0006] In order to prevent the liquid level from impacting the lower port and causing the air-holding barrel to shake axially when the liquid level rises to the lower port of the air-holding barrel, a plurality of lateral liquid holes are provided on the outer wall of the open end of the air-holding barrel.

[0007] In order to facilitate the fixed installation of the liquid level meter in the sewage tank, a plurality of mounting holes are provided around the disk surface of the flange for fixing the measuring components.

[0008] Furthermore, the conduit and the trachea connector are sealed and plugged together via a quick-insert structure, and the trachea connector is sealed and connected to the flange.

[0009] In order to facilitate the timely discharge of liquid in the detection container when it is full, the pressure difference sensing switch is connected to the control component of the discharge pipeline of the detection container by signal.

[0010] Furthermore, the air-holding barrel is a seamless steel pipe with an inner diameter of 50-80 mm and a wall thickness of 2-3 mm, and the axial length of the air-holding barrel is greater than 80 cm.

[0011] In order to make the length of the breath-holding barrel compatible with the detection liquid level range, the height of the lower port of the breath-holding barrel is 50-60 cm lower than the maximum allowable liquid level of the detection container when it is installed.

[0012] The utility model of the pneumatic differential pressure level gauge has the following beneficial effects when used for sewage level detection: the air-holding barrel used for liquid level sensing is a tubular cavity with a certain diameter. When the liquid level reaches the lower end of the air-holding barrel, the inner cavity of the air-holding barrel forms a sealed pressure chamber. As the liquid level rises, the pressure of the inner cavity of the air-holding barrel increases due to compression, forming a pressure differential with the atmospheric pressure. The higher the liquid level, the greater the pressure differential. The liquid level height obtained by conversion changes with the pressure differential, which is reflected by the pressure differential sensing switch, thereby timely monitoring the change of the liquid level through the change of the pressure differential. The diameter of the inner cavity of the air-holding barrel is relatively large, and a certain amount of dirt adhering to the inner wall has little effect on the pressure differential change value, and does not affect the detection accuracy of the liquid level, which greatly improves the sensitivity of the liquid level detection and the stability of the detection value in the long sewage. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a three-dimensional diagram of the pneumatic differential pressure level gauge of the present utility model.

[0014] Figure 2 It is the front view of the pneumatic differential pressure level gauge of the utility model.

[0015] Among them, 1 is the air holding tank; 2 is the side liquid hole; 3 is the flange; 4 is the mounting hole; 5 is the air pipe joint; 6 is the catheter; 7 is the pressure difference sensing switch. DETAILED DESCRIPTION

[0016] The pneumatic differential pressure level gauge of the present utility model will be described in detail below with reference to the accompanying drawings.

[0017] like Figure 1 and Figure 2When the bottle is fully opened, the bottle 1 is in the airtight position, and the bottle 2 is in the airtight position, and the bottle 3 is in the airtight position. When the bottle is fully opened, the bottle 1 is in the airtight position, and the bottle 2 is in the airtight position, and the bottle 3 is in the airtight position. When the bottle is fully opened, the bottle 1 is in the airtight position, and the bottle 2 is in the airtight position, and the bottle 3 is in the airtight position, and the bottle 3 is in the airtight position, and the bottle 3 is in the airtight position, and the bottle 1 is in the airtight position, and the bottle 2 is in the airtight position, and the bottle 3 is in the airtight position, and the bottle 1 is in the airtight position, and the bottle 1 is in the airtight position, and the bottle 1 is in the airtight position, and the bottle 1 is in the airtight position, and the bottle

[0018] In order to prevent the liquid level from rising to the lower port of the breath-holding barrel 1 and the liquid surface from impacting the outer periphery of the lower port, causing axial shaking of the breath-holding barrel 1, a plurality of lateral liquid holes 2 are provided on the outer wall of the open end of the breath-holding barrel 1. Liquid flows into the barrel from the liquid holes and the lower port at the same time to balance the impact force of the liquid surface in various lateral directions on the lower end of the barrel, thereby avoiding axial shaking of the lower end of the barrel when it just contacts the liquid surface.

[0019] In order to facilitate the fixed installation of the liquid level meter in the sewage tank, a number of mounting holes 4 are provided around the surface of the flange 3 for the fixed installation of the breath holding barrel 1 in the detection container. To facilitate installation, a mounting bracket and other structures are provided on the upper side of the highest liquid level in the detection container to facilitate the installation of the flange.

[0020] The conduit 6 and the tracheal connector 5 are sealed and plugged together via a quick-connect structure, and the tracheal connector 5 is sealed and connected to the flange 3 to facilitate the connection between the conduit 5 and the air-holding barrel 1. Generally, the tracheal connector 5 and the flange 3 adopt a threaded sealing connection structure, with a threaded pipe hole provided on the flange, and the connecting end of the tracheal connector 5 is provided with a pipe thread. The pipe thread and the sealing ring are used to achieve a sealed connection, which not only facilitates the disassembly and replacement of the tracheal connector 5, but also facilitates the assembly and connection of the tracheal connector 5 and the conduit 6.

[0021] To accurately detect liquid levels and maintain a clear inner cavity during long-term use, allowing for monitoring within a certain liquid level range, the inner diameter of the tank 1 is 50-80mm, and the wall thickness is 2-3mm. The axial length of the tank 1 is greater than 80cm. To ensure that the length of the tank 1 matches the detection range, the lower end of the tank 1 is installed 50-60cm below the maximum allowable liquid level of the detection container. When the liquid reaches the maximum level, a pressure differential cavity of a certain height is maintained within the tank 1 to ensure accurate liquid level detection.

[0022] The pneumatic differential pressure level gauge of the present invention is installed within the container to be tested. It is particularly suitable for detecting liquid levels in containers with high contaminant content, such as transition tanks or sewage tanks at garbage transfer stations. A bracket-like connection structure is typically provided within the test container for fixed connection to a flange 3. Once connected, the flange 3 is horizontal, and the air-holding container 1 is vertically downward. During installation, the lower port is positioned 50 cm below the maximum allowable liquid level. A differential pressure sensor 7 is sealed to the air pipe connector 5 via a conduit 8. The pressure sensor 7 can be installed at a suitable location outside the test container and is signal-connected to the suction or drain valve in the test container's discharge line to control the valve's opening and closing. When the liquid level reaches the maximum level, a trigger signal is generated, causing the suction or drain valve to open and initiate discharge. Thus, changes in the differential pressure within the sealed chamber of the air-holding container 1 measure changes in the liquid level within the chamber. The larger inner diameter of the air-holding container 1 ensures stability and accuracy in converting pressure differential changes into liquid level changes over long-term use. Even if there is dirt adhering to the inner wall of the breath-holding barrel 1, the accuracy of the detection can be ensured.

[0023] The pneumatic differential pressure level detector of the present invention is not limited to the water level detection of the above-mentioned sewage tank and transition tank, but is also applicable to the liquid level detection of other containers. It has wide applicability, high stability of detection data, and strong environmental adaptability.

Claims

1. A pneumatic differential pressure level gauge, characterized in that: It includes a flange, one side of which is connected to a breath-holding barrel, one end of which is connected to the flange, and the other end of which is open. The breath-holding barrel is vertically arranged when installed, and the open end is downwardly arranged for contact and communication with the liquid level. The breath-holding barrel and the flange are arranged concentrically, and a trachea joint connected to the breath-holding barrel is fixed at the center of the flange, and the trachea joint is connected to a catheter, and the other end of the catheter is connected to a pressure differential sensing switch. When in use, when the liquid level in the container rises, liquid is introduced into the breath-holding barrel from the open end, causing the pressure difference in the inner cavity of the breath-holding barrel to change and transmit it to the pressure differential sensing switch. The pressure differential sensing switch is used to measure the pressure difference change value in the breath-holding barrel and convert it into a liquid level value in the inner cavity of the breath-holding barrel, so as to display the liquid level in the breath-holding barrel.

2. The pneumatic differential pressure level gauge according to claim 1, characterized in that: The outer wall of the open end of the breath-holding barrel is provided with a plurality of lateral liquid holes.

3. The pneumatic differential pressure level gauge according to claim 1, characterized in that: The flange is provided with a plurality of mounting holes around its surface for fixing the air-holding barrel in the detection container.

4. The pneumatic differential pressure level gauge according to claim 1, characterized in that: The conduit and the trachea connector are sealed and plugged together via a quick-insert structure, and the trachea connector is sealed and communicated with the flange.

5. The pneumatic differential pressure level gauge according to claim 1, characterized in that: The pressure difference sensing switch is connected to the control component of the discharge pipeline of the detection container by signal.

6. The pneumatic differential pressure level gauge according to claim 1, characterized in that: The air-holding barrel is a seamless steel pipe with an inner diameter of 50-80 mm and a wall thickness of 2-3 mm. The axial length of the air-holding barrel is greater than 80 cm.

7. The pneumatic differential pressure level gauge according to claim 6, characterized in that: When the air-holding barrel is installed, the height of the lower port is 50-60 cm lower than the maximum allowable liquid level of the detection container.

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