Air pressure type liquid level detecting device

Abstract

The application discloses an air pressure type liquid level detection device and relates to the field of liquid level detection of washing machines. The device comprises a ring-shaped frame installed in a drum washing machine, a shell fixedly installed on the ring-shaped frame, a horizontal rod fixedly installed on the shell, a positioning frame fixedly installed on the horizontal rod, and a detection mechanism arranged on one side of the ring-shaped frame for detecting the liquid level in the drum washing machine. The device transports gas through a sealing ring connected with a first gas chamber by water pressure, transmits pressure to the inside of a connected sensor through a second gas chamber, a first air pipe and a second air pipe, and directly measures liquid pressure through a pressure transmitter. The cross comparison of data of the two can effectively avoid single sensor errors, ensure the accuracy of water level detection, for example, when one side detects abnormal data, the system will automatically calibrate or pause operation, reduce the risk of misjudgment, and improve the accuracy of detected water level, so that the liquid level can be accurately controlled.

Description

Technical Field

[0001] This application relates to the field of liquid level detection in washing machines, and more particularly to pneumatic liquid level detection devices. Background Technology

[0002] A drum washing machine is a washing device designed to mimic the principle of beating clothes with a stick.

[0003] In existing drum washing machines, the water level sensor is usually used to detect changes in the liquid level inside the drum to perform the water filling operation. Therefore, the accuracy of liquid level change detection is very important for the drum washing machine to complete its basic functions. Thus, a pneumatic liquid level detection device with high detection accuracy is needed. Utility Model Content

[0004] To improve the detection of changes in liquid level inside the drum, this application provides a pneumatic liquid level detection device.

[0005] The pneumatic liquid level detection device provided in this application adopts the following technical solution: The pneumatic liquid level detection device includes an annular frame installed inside a drum washing machine, a housing fixedly installed on the annular frame, a crossbar fixedly installed on the housing, a positioning frame fixedly installed on the crossbar, and a detection mechanism for detecting the liquid level inside the drum washing machine is provided on one side of the annular frame.

[0006] The detection mechanism includes a first gas chamber disposed on one side of a ring frame, a sealing tube installed on one side of the first gas chamber, an installation ring fixedly installed at one end of the sealing tube, a second gas chamber fixedly installed at one end of the installation ring, the second gas chamber and the sealing tube being installed in a through-hole configuration, a first gas pipe being sealed and installed through-hole on one side of the second gas chamber, an assembly pipe fixedly installed on the first gas pipe, a second gas pipe fixedly installed on the assembly pipe, a third gas pipe fixedly and through-hole installed on the second gas pipe, a regulating valve provided at one end of the second gas pipe, a pressure transmitter provided on the third gas pipe, a wire connected to the pressure transmitter, and a PLC connected to the wire.

[0007] By adopting the above technical solution, the pressure is transmitted to the connected sensor through the second gas chamber, the first gas pipe, and the second gas pipe. The liquid pressure can be directly measured through the pressure transmitter. Furthermore, by cross-comparing the data from both sensors, the error of a single sensor can be effectively avoided, ensuring the accuracy of water level detection. For example, when one of them detects abnormal data, the system will automatically calibrate or suspend operation, reducing the risk of misjudgment and improving the accuracy of water level detection. Therefore, the liquid level can be precisely controlled.

[0008] Preferably, a throttle valve is fitted onto the second air tube.

[0009] By adopting the above technical solution, the fluid flow rate can be controlled by changing the throttling cross section or throttling length through the throttling valve.

[0010] Preferably, a support plate is fixedly installed at the bottom of the first trachea, and the side of the support plate near the first trachea is U-shaped.

[0011] By adopting the above technical solution and setting up a support plate, the installation can be assisted.

[0012] Preferably, a plurality of first fixing brackets for positioning and installation are fixedly installed on one side of the first gas chamber.

[0013] By adopting the above technical solution and setting up the first fixing frame, the installation and positioning can be assisted.

[0014] Preferably, two connecting pipes are symmetrically and fixedly installed on one side of the first gas chamber, and the two connecting pipes are sealed. Multiple corresponding second fixing brackets are fixedly installed on the outer surface of the annular frame.

[0015] By adopting the above technical solution and setting a second fixing frame, the installation and positioning can be assisted, thereby improving the stability and firmness of the ring frame during use.

[0016] Preferably, the top of the first gas chamber is provided with an infrared sensor for use in conjunction with an external display terminal to monitor the operating status of the detection mechanism, and corresponding mounting bases are fixedly installed on both sides of the infrared sensor.

[0017] By adopting the above technical solution, infrared sensors can detect the health status of components, such as corrosion, and display alarms through a display terminal used in conjunction with the sensors. This improves the efficiency of maintenance and replacement by staff, thereby enhancing the safety and stability of the components during use.

[0018] Preferably, a plurality of fixed columns are fixedly installed on the top of the first gas chamber, and the same clamping plate is slidably sleeved on the plurality of fixed columns. A corresponding connecting frame is fixedly installed on each of the plurality of fixed columns. A spring is sleeved on the fixed column, and the two ends of the spring are respectively fixedly installed on the side of the connecting frame and the clamping plate that are close to each other. A positioning groove is opened on the mounting base, and a positioning block is provided in the positioning groove. The positioning block is fixedly installed with the clamping plate, and a handle is fixedly installed on the top of the clamping plate.

[0019] By adopting the above technical solution, pulling the handle upwards can move the clamping plate upwards as well, causing the positioning block to disengage from the positioning slot. At this point, the positioning installation of the infrared sensor can be released, making it easier to maintain and replace it later.

[0020] In summary, this application includes at least one of the following beneficial technical effects:

[0021] 1. This application employs a pressure transmitter and other similar devices. Gas is delivered through a sealing ring connected to the first gas chamber by water pressure, and the pressure is transmitted to the connected sensor through the second gas chamber, the first gas pipe, and the second gas pipe. The pressure transmitter can directly measure the liquid pressure, and cross-comparison of the two data can effectively avoid errors from a single sensor, ensuring the accuracy of water level detection. For example, when one of them detects abnormal data, the system will automatically calibrate or pause operation, reducing the risk of misjudgment and improving the accuracy of water level detection. Therefore, the liquid level can be precisely controlled.

[0022] 2. This application employs infrared sensors and other technologies. The infrared sensors can detect the corrosion and other health conditions of the component surface and display alarms through a display terminal used in conjunction with them. This improves the efficiency of maintenance and replacement by the staff and further enhances the safety and stability during use. By pulling the handle upward, the clamping plate can also be moved upward, causing the positioning block to disengage from the positioning slot. At this point, the positioning installation of the infrared sensor can be released, facilitating its maintenance and replacement in the future. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the pneumatic liquid level detection device according to an embodiment of this application;

[0024] Figure 2 This is a partial unfolded schematic diagram illustrating the main embodiment of the detection structure in this application;

[0025] Figure 3 This is a schematic diagram of the pneumatic pipeline that mainly illustrates the detection structure in the embodiments of this application;

[0026] Figure 4 This is a schematic diagram illustrating the main monitoring structure in the embodiments of this application;

[0027] Figure 5 This is a schematic diagram illustrating the disassembly and assembly of the monitoring structure, which is the main feature of this application embodiment.

[0028] Reference numerals: 1. Ring frame; 2. Housing; 3. Crossbar; 4. Positioning frame; 5. First gas chamber; 6. First fixing frame; 7. Connecting pipe; 8. Sealing pipe; 9. Mounting ring; 10. Second gas chamber; 11. First gas pipe; 12. Second fixing frame; 13. Support plate; 14. Assembly pipe; 15. Second gas pipe; 16. Third gas pipe; 17. Throttling valve; 18. Pressure transmitter; 19. Wire; 20. PLC; 21. Regulating valve; 22. Infrared sensor; 23. Connecting frame; 24. Mounting base; 25. Positioning groove; 26. Positioning block; 27. Fixing column; 28. Spring; 29. ​​Clamping plate; 30. Handle. Detailed Implementation

[0029] The following is in conjunction with the appendix Figures 1-5 This application will be described in further detail.

[0030] This application discloses a pneumatic liquid level detection device.

[0031] Reference Figure 1-3 The pneumatic liquid level detection device includes a ring frame 1 installed inside a drum washing machine, a housing 2 fixedly installed on the ring frame 1, a crossbar 3 fixedly installed on the housing 2, a positioning frame 4 fixedly installed on the crossbar 3, a detection mechanism set on one side of the ring frame 1 for detecting the liquid level inside the drum washing machine, a water level sensor in this application which is an existing technology product, so the specific installation method and connection and use process are not described in detail, and a monitoring mechanism set on the detection mechanism.

[0032] The detection mechanism includes a first gas chamber 5 located on one side of the ring frame 1. A sealing tube 8 is installed on one side of the first gas chamber 5. An installation ring 9 is fixedly installed at one end of the sealing tube 8. A second gas chamber 10 is fixedly installed at one end of the installation ring 9. The second gas chamber 10 and the sealing tube 8 are connected. A first gas pipe 11 is sealed and connected to one side of the second gas chamber 10. An assembly pipe 14 is fixedly installed on the first gas pipe 11. A second gas pipe 15 is fixedly installed on the assembly pipe 14. A third gas pipe 16 is fixedly connected to the second gas pipe 15. A regulating valve 21 is provided at one end of the second gas pipe 15. A pressure transmitter 18 is provided on the third gas pipe 16.

[0033] Among them, the pressure transmitter 18 is connected to the wire 19, the wire 19 is connected to the PLC 20, the second air pipe 15 is fitted with a throttle valve 17, the bottom of the first air pipe 11 is fixedly installed with a support plate 13, the side of the support plate 13 near the first air pipe 11 is U-shaped, a number of first fixing brackets 6 are fixedly installed on one side of the first gas chamber 5 for positioning, two connecting pipes 7 are symmetrically fixedly installed through one side of the first gas chamber 5, the two connecting pipes 7 are sealed, and a number of corresponding second fixing brackets 12 are fixedly installed on the outer surface of the ring frame 1.

[0034] When in use, as the washing machine begins to fill with water, the water level in the tub gradually rises. The water pressure is transmitted to the gas through a sealing ring connected to the first gas chamber 5, and then transmitted to the connected sensor through the second gas chamber 10, the first gas pipe 11, and the second gas pipe 15. The liquid pressure can be directly measured through the pressure transmitter 18. By cross-comparing the data from both sensors, errors from a single sensor can be effectively avoided, ensuring the accuracy of water level detection. For example, if one sensor detects abnormal data, the system will automatically calibrate or pause operation, reducing the risk of misjudgment and improving the accuracy of water level detection. Therefore, the liquid level can be precisely controlled.

[0035] Reference Figure 1-3 The monitoring mechanism includes an infrared sensor 22 installed on the top of the first gas chamber 5 for use with an external display terminal and to monitor the operation of the detection mechanism. The infrared sensor 22 has corresponding mounting bases 24 fixedly installed on both sides. Multiple fixing columns 27 are fixedly installed on the top of the first gas chamber 5. The same clamping plate 29 is slidably fitted on the multiple fixing columns 27. The multiple fixing columns 27 are fixedly installed with corresponding connecting frames 23. Springs 28 are fitted on the fixing columns 27. The two ends of the springs 28 are respectively fixedly installed on the side of the connecting frame 23 and the clamping plate 29 that are close to each other. The mounting base 24 has a positioning groove 25. The positioning groove 25 has a positioning block 26. The positioning block 26 is fixedly installed with the clamping plate 29. The top of the clamping plate 29 is fixedly installed with a handle 30.

[0036] In use, the infrared sensor 22 can sense the corrosion and other health conditions of the component surface and display an alarm through the display terminal used in conjunction with it, thereby improving the maintenance and replacement capabilities of the staff and further enhancing the safety and stability during use. By pulling the handle 30 upward, the clamping plate 29 can also be moved upward, causing the positioning block 26 to disengage from the positioning groove 25. At this time, the positioning installation of the infrared sensor 22 can be released, making it easier to maintain and replace it later.

[0037] The flow rate and pressure of the gas can be adjusted by regulating valve 21; the flow rate of the fluid can be controlled by changing the throttling cross section or throttling length by using throttling valve 17.

[0038] The implementation principle of the pneumatic liquid level detection device in this application embodiment is as follows: When the washing machine starts to fill with water, the water level in the drum gradually rises. The water pressure is transmitted to the gas through the sealing ring connected to the first gas chamber 5, and the pressure is transmitted to the connected sensor through the second gas chamber 10, the first air pipe 11 and the second air pipe 15. The liquid pressure can be directly measured through the pressure transmitter 18. By cross-comparing the data of the two, the error of a single sensor can be effectively avoided, ensuring the accuracy of water level detection. For example, when one of them detects abnormal data, the system will automatically calibrate or suspend operation to reduce the risk of misjudgment and improve the accuracy of water level detection. Therefore, the liquid level can be precisely controlled.

[0039] The infrared sensor 22 can detect the corrosion and other health conditions of the component surface and display an alarm through the display terminal used in conjunction with it, thereby improving the maintenance and replacement capabilities of the staff and further enhancing the safety and stability during use. By pulling the handle 30 upward, the clamping plate 29 can also be moved upward, causing the positioning block 26 to disengage from the positioning groove 25. At this time, the positioning installation of the infrared sensor 22 can be released, making it easier to maintain and replace it later.

[0040] The gas flow rate and pressure can be adjusted via regulating valve 21; the fluid flow rate can be controlled by changing the throttling cross-section or throttling length via throttling valve 17; in this application, the PLC 20 program calculates the average low value when the pressure fluctuates during the rotation of the silo, and the silo can only be turned over when the value is set at the turning point. After adding water to the silo to the turning point level, the water level in mm is checked. The water level measured in the tank must match the value displayed on the PLC. If they do not match, the PLC parameters need to be corrected; the lint in the pressure pipe is blown out by 0.08 MPa compressed air.

[0041] 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 pneumatic liquid level detection device, comprising a ring frame (1) installed inside a drum washing machine, characterized in that: A housing (2) is fixedly installed on the ring frame (1), a crossbar (3) is fixedly installed on the housing (2), a positioning frame (4) is fixedly installed on the crossbar (3), and a detection mechanism for detecting the liquid level inside the drum washing machine is provided on one side of the ring frame (1). The detection mechanism includes a first gas chamber (5) set on one side of the ring frame (1), a sealing tube (8) installed on one side of the first gas chamber (5), an installation ring (9) fixedly installed at one end of the sealing tube (8), a second gas chamber (10) fixedly installed at one end of the installation ring (9), the second gas chamber (10) and the sealing tube (8) are installed in a through connection, a first gas pipe (11) is sealed and installed in a through connection on one side of the second gas chamber (10), an assembly pipe (14) is fixedly installed on the first gas pipe (11), a second gas pipe (15) is fixedly installed on the assembly pipe (14), a third gas pipe (16) is fixedly installed in a through connection on the second gas pipe (15), a regulating valve (21) is provided at one end of the second gas pipe (15), a pressure transmitter (18) is provided on the third gas pipe (16), a wire (19) is connected to the pressure transmitter (18), and a PLC (20) is connected to the wire (19).

2. The pneumatic liquid level detection device according to claim 1, characterized in that: A throttle valve (17) is fitted onto the second air pipe (15).

3. The pneumatic liquid level detection device according to claim 1, characterized in that: A support plate (13) is fixedly installed at the bottom of the first trachea (11), and the support plate (13) is U-shaped on the side near the first trachea (11).

4. The pneumatic liquid level detection device according to claim 1, characterized in that: Multiple first fixing brackets (6) for positioning are fixedly installed on one side of the first gas chamber (5).

5. The pneumatic liquid level detection device according to claim 4, characterized in that: Two connecting pipes (7) are symmetrically fixed and installed on one side of the first gas chamber (5). The two connecting pipes (7) are sealed. Multiple corresponding second fixing brackets (12) are fixedly installed on the outer surface of the ring frame (1).

6. The pneumatic liquid level detection device according to claim 1, characterized in that: The top of the first gas chamber (5) is provided with an infrared sensor (22) for use in conjunction with an external display terminal and for monitoring the operation status of the detection mechanism. Corresponding mounting bases (24) are fixedly installed on both sides of the infrared sensor (22).

7. The pneumatic liquid level detection device according to claim 6, characterized in that: Multiple fixed columns (27) are fixedly installed on the top of the first gas chamber (5). The same clamping plate (29) is slidably sleeved on the multiple fixed columns (27). A corresponding connecting frame (23) is fixedly installed on each of the multiple fixed columns (27). A spring (28) is sleeved on the fixed column (27). The two ends of the spring (28) are respectively fixedly installed on the side of the connecting frame (23) and the clamping plate (29) that are close to each other. A positioning groove (25) is opened on the mounting base (24). A positioning block (26) is provided in the positioning groove (25). The positioning block (26) is fixedly installed with the clamping plate (29). A handle (30) is fixedly installed on the top of the clamping plate (29).

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