Blowing instrument measurement gas path system capable of preventing backflow

Abstract

The utility model relates to the technical field of air blowing instrument devices, and particularly discloses an anti-backflow air blowing instrument measuring air path system which comprises an integrated air blowing instrument and a plurality of diaphragm type one-way valves, the integrated air blowing instrument is fixedly installed at the upper ends of the diaphragm type one-way valves, and the diaphragm type one-way valves are fixedly installed on the integrated air blowing instrument. And air blowing pipes are mounted at the ends, away from the integrated air blowing instrument, of the diaphragm type one-way valves. According to the invention, the problem of inaccurate technological parameters of blowing measurement caused by backward flowing of a blowing measurement gas path system when the working conditions of a measurement medium of the blowing instrument are alternately switched among three working conditions of micro negative pressure, vacuum and positive pressure can be solved.

Description

A backflow-proof air-blowing instrument measuring air circuit system Technical Field

[0001] This application relates to the technical field of air blowing instruments, and in particular to an air blowing instrument measuring air circuit system that is designed to prevent backflow. Background Technology

[0002] Air-blowing instruments are commonly used liquid level measuring instruments in industrial production. Except for the air-blowing tube, other measuring elements do not contact the medium in the measured equipment. Air-blowing instruments can measure the liquid level parameters of the medium inside the measured equipment while keeping the measuring unit away from the equipment, giving them a unique market advantage. The air-blowing instrument consists of a measuring component and a pressure-tapping component. The pressure-tapping component outputs an adjustable and stable gas flow rate, which is evenly distributed to each air-blowing tube. Finally, the stable gas flow rate overflows from the lower end of the air-blowing tube inserted into the measured equipment, creating continuous, uniform, and stable bubbles. These bubbles are then discharged into the atmosphere in the measuring tank through the liquid. Because the number of bubbles at the lower end of the air-blowing tube is small and the gas velocity is low, the air loss along the way in the air-blowing tube can be ignored. Thus, the gas pressure in the air-blowing tube is almost equal to the static pressure of the liquid level. The differential pressure measurement unit in the measuring component of the air blowing instrument can detect the differential pressure signal between the air blowing tubes, and its output pressure can automatically change with the change of the outlet pressure of the air blowing tube. By inserting different numbers of air blowing tubes into the device under test, the liquid level, density, interface, column weight and other variable parameters of the measuring tank can be measured by measuring the pressure difference between the air blowing tubes.

[0003] Conventional air-blowing measurement media operate under relatively stable and singular conditions, such as positive pressure, slight negative pressure, and vacuum, with little alternation between these conditions. However, with the increasing market application of air-blowing instruments, particularly in situations where slight negative pressure, vacuum, and positive pressure conditions alternate, if the vertical installation distance between the air-blowing pipeline and the instrument is short, the sudden pressure change in the measured equipment during the switching between these three conditions can easily cause liquid to rapidly flow back into the air-blowing instrument. This can damage instrument components, result in inaccurate air-blowing process parameters, and severely impact the operation of the entire air-blowing measurement system.

[0004] In response to the aforementioned technologies, and to address the problem that backflow occurs in the gas path system of the gas blowing instrument when the measuring medium conditions are alternating between slight negative pressure, vacuum, and positive pressure, resulting in inaccurate process parameters, this application proposes a gas path system for the gas blowing instrument that can prevent backflow. Summary of the Invention

[0005] To address the problem of backflow in the gas path system of a gas blowing instrument when the measuring medium alternates between three operating conditions—slight negative pressure, vacuum, and positive pressure—leading to inaccurate process parameters, this application provides a gas path system for a gas blowing instrument that is designed to prevent backflow.

[0006] This application provides a backflow-preventable air-blowing instrument measuring gas path system, which adopts the following technical solution:

[0007] A backflow-proof air blowing instrument measuring air circuit system includes an integrated air blowing instrument and multiple diaphragm one-way valves. The integrated air blowing instrument is fixedly installed on the upper end of the multiple diaphragm one-way valves, and an air blowing pipe is installed on the end of the multiple diaphragm one-way valves away from the integrated air blowing instrument.

[0008] By adopting the above technical solution, the integrated air blowing instrument is used to measure variable parameters such as liquid level in the tested equipment. At the same time, the diaphragm check valve prevents liquid backflow, ensuring the normal operation of the integrated air blowing instrument.

[0009] Preferably, the integrated air blowing instrument includes a measuring component, a pressure tapping component, an air source interface, and multiple air blowing pipe connection joints. The measuring component is fixedly installed on the upper end of the pressure tapping component, the air source interface is fixedly installed on one side of the pressure tapping component, the air blowing pipe connection joints are fixedly installed on the bottom end of the pressure tapping component, and the end of the air blowing pipe connection joint away from the pressure tapping component is fixedly connected to the diaphragm one-way valve. The air blowing pipe connection joints and the diaphragm one-way valves correspond one-to-one.

[0010] By adopting the above technical solution, the measuring component measures the liquid level, density, interface, column weight and other variable parameters in the tested equipment by measuring the pressure difference between the three air blowing pipes; the pressure tapping component receives a stable air source input from the air source interface and converts it into gas with an adjustable and stable flow rate. The gas is evenly distributed to the three air blowing pipes through the air blowing pipe connection joint and the diaphragm one-way valve. Continuous, uniform and stable bubbles overflow from the end of the air blowing pipe away from the diaphragm one-way valve, and the bubbles are discharged into the tested equipment through the liquid.

[0011] Preferably, the diaphragm-type one-way valve includes a first ferrule nut, a second ferrule nut, an air blowing pipe interface, an upper valve body, and a lower valve body. The first ferrule nut is fixedly connected to the upper valve body. The end of the upper valve body away from the first ferrule nut is fixedly connected to the lower valve body. The end of the lower valve body away from the upper valve body is fixedly connected to the second ferrule nut. The end of the second ferrule nut away from the lower valve body is detachably connected to the air blowing pipe interface.

[0012] By adopting the above technical solution, the ferrule connection facilitates the replacement of the air blowing pipe interface. The air blowing pipe interface is used to connect the air blowing pipe, which can effectively prevent liquid in the tested equipment from flowing back into the integrated air blowing instrument.

[0013] Preferably, it also includes an O-ring, which is sleeved on the outer periphery of the upper valve body near the lower valve body, and the end of the O-ring away from the upper valve body abuts against the end of the lower valve body near the upper valve body.

[0014] By adopting the above technical solution, the O-ring is used to enhance the sealing performance at the connection between the upper valve body and the lower valve body, and to prevent gas or liquid leakage.

[0015] Preferably, it also includes a diaphragm, and a cavity is provided between the upper valve body and the lower valve body, with the diaphragm disposed in the cavity near one end of the upper valve body.

[0016] By adopting the above technical solution, the diaphragm acts as a gas circuit switch, allowing gas to pass through under normal conditions and preventing liquid backflow.

[0017] Preferably, the thickness of the diaphragm is less than 0.5 mm.

[0018] By adopting the above technical solution, the diaphragm, as a gas circuit switch, is lightweight and requires very little force to open and close, thus resulting in very low pressure loss. Even if liquid backflow occurs during backflow prevention and the diaphragm in the diaphragm-type check valve comes into contact with the liquid in the tested equipment, the diaphragm can return to its original state in a very short time, ensuring the repeatability and hysteresis of the gas circuit system measured by the air blowing instrument, making the air blowing measurement more accurate.

[0019] Preferably, it also includes a filter screen, which is disposed in the cavity near one end of the lower valve body, and the filter screen has multiple holes.

[0020] By adopting the above technical solution, the filter screen can effectively prevent solid particles in the tested equipment from entering the integrated air blowing instrument.

[0021] Preferably, the size of the filter screen is larger than the size of the membrane.

[0022] By adopting the above technical solutions, the filter screen can block impurities and foreign objects, reduce the chance of the membrane coming into contact with impurities, thereby extending the service life of the membrane. Larger filter screens can also filter more impurities.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. The integrated air blowing instrument is used to measure variable parameters such as liquid level in the tested equipment, while the diaphragm check valve prevents liquid backflow, ensuring the normal operation of the integrated air blowing instrument;

[0025] 2. The measuring component measures the liquid level, density, interface, column weight, and other variable parameters in the tested equipment by measuring the pressure difference between the three air blowing pipes; the pressure tapping component receives a stable air source input from the air source interface and converts it into an adjustable and stable flow rate of gas. This gas is evenly distributed to the three air blowing pipes through the air blowing pipe connection joint and the diaphragm one-way valve. Continuous, uniform, and stable bubbles overflow from the end of the air blowing pipe away from the diaphragm one-way valve, and these bubbles are discharged into the tested equipment through the liquid.

[0026] 3. The diaphragm acts as a gas circuit switch, allowing gas to pass through under normal conditions and preventing liquid backflow; the filter screen can effectively prevent solid particles in the tested equipment from entering the integrated air blowing instrument. Attached Figure Description

[0027] Figure 1 is a schematic diagram of the overall structure of a backflow-proof air-blowing instrument measuring air circuit system according to this application;

[0028] Figure 2 is a schematic diagram of the structure of a backflow-proof air-blowing instrument measuring air circuit system of this application, highlighting the diaphragm-type check valve;

[0029] Figure 3 is a cross-sectional view of a diaphragm-type check valve of a backflow-proof air-blowing instrument measuring gas circuit system according to this application.

[0030] Figure 4 is a schematic diagram of the structure of a backflow-proof air measuring instrument system with a prominent filter screen.

[0031] Reference numerals: 1. Integrated air blowing instrument; 11. Measuring component; 12. Pressure tapping component; 13. Air source interface; 14. Air blowing pipe connection joint; 2. Diaphragm type one-way valve; 21. First ferrule nut; 22. Second ferrule nut; 23. Air blowing pipe interface; 24. Upper valve body; 25. Lower valve body; 251. Cavity; 26. O-ring seal; 27. Diaphragm; 28. Filter screen; 281. Hole; 29. ​​Marking. Detailed Implementation

[0032] The present application will be further described in detail below with reference to Figures 1-4.

[0033] This application discloses a backflow-preventable air-blowing instrument measuring air circuit system.

[0034] Referring to Figure 1, a backflow-preventable air-blowing instrument measurement gas path system includes an integrated air-blowing instrument 1 and multiple diaphragm-type check valves 2. The integrated air-blowing instrument 1 is fixedly installed on the upper end of the diaphragm-type check valves 2 and is used to measure variable parameters such as liquid level, density, interface, and column weight in the tested equipment. Air-blowing pipes are installed at the ends of the multiple diaphragm-type check valves 2 away from the integrated air-blowing instrument 1. The diaphragm-type check valves 2 can prevent liquid from the tested equipment from flowing back into the integrated air-blowing instrument 1, ensuring the normal operation of the integrated air-blowing instrument 1. In this embodiment, three diaphragm-type check valves 2 are used.

[0035] The integrated air blowing instrument 1 is used to measure variable parameters such as liquid level in the tested equipment, while the diaphragm check valve 2 prevents liquid backflow and ensures the normal operation of the integrated air blowing instrument 1.

[0036] The integrated air blowing instrument 1 includes a measuring component 11, a pressure tapping component 12, an air source interface 13, and multiple air blowing pipe connection joints 14. The measuring component 11 is fixedly installed on the upper end of the pressure tapping component 12, and the air source interface 13 is fixedly installed on one side of the pressure tapping component 12. The air blowing pipe connection joints 14 are fixedly installed on the bottom end of the pressure tapping component 12, and the end of the air blowing pipe connection joint 14 away from the pressure tapping component 12 is fixedly connected to a diaphragm-type check valve 2. In this embodiment, three air blowing pipe connection joints 14 are provided corresponding to the diaphragm-type check valve 2. The measuring component 11 measures the liquid level, density, interface, column weight, and other variable parameters in the tested equipment by measuring the pressure difference between the three air blowing pipes. The pressure tapping component 12 receives a stable gas source from the gas source interface 13 and converts it into an adjustable and stable flow rate of gas. This gas is evenly distributed to three gas blowing pipes through the gas blowing pipe connector 14 and the diaphragm check valve 2. Continuous, uniform, and stable bubbles overflow from the end of the gas blowing pipe away from the diaphragm check valve 2, and these bubbles are discharged into the device under test through liquid. In this embodiment, the gas source interface 13 can be connected to devices such as a small air compressor and a gas cylinder.

[0037] Referring to Figures 2 and 3, the diaphragm-type check valve 2 includes a first ferrule nut 21, a second ferrule nut 22, an air-blowing pipe interface 23, an upper valve body 24, and a lower valve body 25. The first ferrule nut 21 and the upper valve body 24 are threaded together. The end of the upper valve body 24 away from the first ferrule nut 21 is threaded together with the lower valve body 25. The end of the lower valve body 25 away from the upper valve body 24 is threaded together with the second ferrule nut 22. The end of the second ferrule nut 22 away from the lower valve body 25 is connected to the air-blowing pipe interface 23 by a ferrule connection. The ferrule connection facilitates the replacement of the air-blowing pipe interface 23. The air-blowing pipe interface 23 is used to connect an air-blowing pipe.

[0038] An O-ring 26 is provided between the upper valve body 24 and the lower valve body 25. The O-ring 26 is sleeved on the outer periphery of the upper valve body 24 near the lower valve body 25. The end of the O-ring 26 away from the upper valve body 24 abuts against the end of the lower valve body 25 near the upper valve body 24.

[0039] Referring to Figures 3 and 4, a cavity 251 is provided between the upper valve body 24 and the lower valve body 25. A diaphragm 27 and a filter screen 28 are disposed within the cavity 251. Both the diaphragm 27 and the filter screen 28 are circular, with the filter screen 28 being larger than the diaphragm 27. The diaphragm 27 is located at the end of the cavity 251 closest to the upper valve body 24, and its thickness is less than 0.5 mm. As a pneumatic switch, the diaphragm 27 is lightweight, requiring very little force to open and close, resulting in minimal pressure loss. Even if liquid backflow occurs during backflow prevention, causing the diaphragm 27 to come into contact with the liquid in the tested device, the diaphragm 27 can quickly return to its original shape, making the air blowing measurement more accurate. The design of the cavity 251 effectively protects the diaphragm 27 and extends its service life. The filter screen 28 is located at the end of the cavity 251 closest to the lower valve body 25, and the filter screen 28 has evenly distributed holes 281. The filter screen 28 can effectively prevent solid particles in the tested equipment from entering the integrated air blowing instrument 1, ensuring the cleanliness of the air blowing instrument's air circuit system.

[0040] Referring to Figures 1 and 2, the diaphragm check valve 2 has a medium flow direction mark 29 engraved on its surface, with the mark 29 pointing from the pressure tapping component 12 to the air blowing pipe.

[0041] The implementation principle of this application embodiment is as follows: The gas source is connected to the pressure tapping component 12 through the gas source interface 13. The pressure tapping component 12 converts the gas into a stable flow gas. The gas flows through the air blowing pipe connection joint 14 and into the diaphragm one-way valve 2 corresponding to the air blowing pipe connection joint 14, and then enters the air blowing pipe. Through the coordinated operation of the integrated air blowing instrument 1 and the diaphragm one-way valve 2, the variable parameters such as liquid level, density, interface, and column weight in the tested equipment are obtained, and liquid backflow is prevented.

[0042] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A blow-through instrument measuring gas path system capable of preventing backflow, characterized in that, It includes an integrated air blowing instrument (1) and multiple diaphragm one-way valves (2). The integrated air blowing instrument (1) is fixedly installed on the upper end of the multiple diaphragm one-way valves (2). An air blowing pipe is installed on the end of the multiple diaphragm one-way valves (2) away from the integrated air blowing instrument (1).

2. The backflow-proof air-blowing instrument measuring air circuit system according to claim 1, characterized in that, The integrated air blowing instrument (1) includes a measuring component (11), a pressure tapping component (12), an air source interface (13), and multiple air blowing pipe connection joints (14). The measuring component (11) is fixedly installed on the upper end of the pressure tapping component (12), the air source interface (13) is fixedly installed on one side of the pressure tapping component (12), and the air blowing pipe connection joints (14) are fixedly installed on the bottom end of the pressure tapping component (12). The end of the air blowing pipe connection joint (14) away from the pressure tapping component (12) is fixedly connected to the diaphragm one-way valve (2). The air blowing pipe connection joints (14) and the diaphragm one-way valve (2) correspond one-to-one.

3. The backflow-proof air-blowing instrument measuring air circuit system according to claim 1, characterized in that, The diaphragm-type one-way valve (2) includes a first ferrule nut (21), a second ferrule nut (22), an air blowing pipe interface (23), an upper valve body (24), and a lower valve body (25). The first ferrule nut (21) and the upper valve body (24) are fixedly connected. The end of the upper valve body (24) away from the first ferrule nut (21) is fixedly connected to the lower valve body (25). The end of the lower valve body (25) away from the upper valve body (24) is fixedly connected to the second ferrule nut (22). The end of the second ferrule nut (22) away from the lower valve body (25) is detachably connected to the air blowing pipe interface (23).

4. The backflow-proof air-blowing instrument measuring air circuit system according to claim 3, characterized in that, It also includes an O-ring (26O), which is sleeved on the outer periphery of the upper valve body (24) near the lower valve body (25), and the end of the O-ring (26O) away from the upper valve body (24) and the end of the lower valve body (25) near the upper valve body (24) abut against each other.

5. The backflow-proof air-blowing instrument measuring air circuit system according to claim 3, characterized in that, It also includes a diaphragm (27), and a cavity (251) is provided between the upper valve body (24) and the lower valve body (25), and the diaphragm (27) is disposed in the cavity (251) near one end of the upper valve body (24).

6. The backflow-proof air-blowing instrument measuring air circuit system according to claim 5, characterized in that, The thickness of the diaphragm (27) is less than 0.5 mm.

7. The backflow resistant, gas blown meter measuring gas path system according to claim 5, wherein, It also includes a filter screen (28), which is disposed in the cavity (251) at one end near the lower valve body (25), and the filter screen (28) has a plurality of holes (281).

8. The backflow resistant, gas blown meter measuring gas path system according to claim 7, wherein, The size of the filter screen (28) is larger than the size of the membrane (27).

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