Air collecting box and air pressure type liquid level detection device for dish washing machine

Abstract

The utility model discloses an air collecting box of an air pressure type liquid level detection device, which comprises a cup body with a hollow structure and an air collecting pipe connected with the cup body, a cup opening is arranged at the bottom of the cup body, the cup opening is a water inlet, the air collecting pipe is positioned at the upper part of the cup body, one end of the air collecting pipe is communicated with a cavity of the cup body, and the other end of the air collecting pipe is communicated with a water outlet of the cup body. One end of the gas collecting pipe is connected with the cup body, the other end of the gas collecting pipe is connected with a gas guide pipe of the air pressure type liquid level detection device, when the air pressure type liquid level detection device detects the liquid level of the container, the cup body is placed on the side wall in the container, the gas collecting pipe extends out of the container through the side wall of the container, and in the detection process, when the liquid level rises to the cup opening, the gas collecting pipe is connected with the cup body. A closed space is formed in the gas collecting box, and when the liquid level continues to rise, gas in the gas collecting box is compressed, so that gas pressure is formed.

Description

Technical Field

[0001] This utility model relates to the field of dishwasher technology, and in particular to a gas collection box and a pneumatic liquid level detection device for dishwashers. Background Technology

[0002] In the field of liquid level detection, accurate acquisition of liquid level information is crucial for many industrial and civilian applications. Traditional liquid level detection methods have many limitations. For example, float-type liquid level detection devices have a relatively simple structure, but are easily affected by impurities in the liquid, leading to a decrease in measurement accuracy, and may experience mechanical failures after long-term use. Capacitive liquid level detection devices have high requirements for the dielectric constant of the medium, have a relatively narrow range of applications, and lack stability in complex liquid environments. Although ultrasonic liquid level detection devices can achieve non-contact measurement, they are easily affected by liquid surface fluctuations and environmental noise, making it difficult to guarantee the accuracy and reliability of the measurement results, and the equipment cost is also high. In view of the shortcomings of the above-mentioned liquid level detection methods, pneumatic liquid level detection devices have emerged. However, in pneumatic liquid level detection devices, the design and performance of the gas collection box play a key role in the accuracy and reliability of the detection. Previous gas collection box designs may have problems such as unreasonable structure, poor sealing performance, and inconvenient connection with the detection device, affecting the overall performance and measurement accuracy of the pneumatic liquid level detection device. Therefore, improvements are needed. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a gas collection box for a pneumatic liquid level detection device.

[0004] The present invention provides a gas collection box for a pneumatic liquid level detection device, comprising a hollow cup body and a gas collection pipe connected to the cup body. The bottom of the cup body is provided with a cup opening, which is a water inlet. The gas collection pipe is located at the upper part of the cup body, with one end connected to the cavity of the cup body and the other end connected to the gas guide pipe of the pneumatic liquid level detection device. When the pneumatic liquid level detection device detects the liquid level of the container, the cup body is placed on the side wall inside the container, and the gas collection pipe extends through the side wall of the container to the outside of the container. During the detection process, when the liquid level rises to the cup opening, a sealed space is formed inside the gas collection box. When the liquid level continues to rise, the gas in the gas collection box is compressed, thereby forming gas pressure.

[0005] Furthermore, the gas collecting pipe extends in an upward inclined manner, and the angle between it and the horizontal direction is an acute angle.

[0006] Furthermore, the cup body and the gas collection tube are integrally formed.

[0007] Furthermore, the height of the cup is significantly greater than its width.

[0008] Furthermore, the rim of the cup is parallel to the horizontal plane.

[0009] The present invention also provides a pneumatic liquid level detection device for a dishwasher, comprising an air guide pipe, a pneumatic liquid level detection mechanism and the aforementioned air collection box, wherein one end of the air guide pipe is connected to the air collection box and the other end is connected to the pneumatic liquid level detection mechanism.

[0010] Furthermore, the pneumatic liquid level detection mechanism includes a housing, a silicone pressure sensing diaphragm, an elastic element, and contacts. The silicone pressure sensing diaphragm, elastic element, and contacts are disposed within the housing. When the air pressure within the air collection box changes, the silicone pressure sensing diaphragm is displaced towards the elastic element by the compressed air pressure, triggering deformation of the elastic element, which in turn actuates the contacts, thus opening and closing the switch and completing the liquid level detection. Furthermore, the pneumatic liquid level detection mechanism also includes an adjusting screw. By adjusting the adjusting screw, the preload of the elastic element can be changed, thereby adjusting the action threshold of the pneumatic liquid level detection mechanism.

[0011] Furthermore, the pneumatic liquid level detection mechanism includes a housing, a silicone pneumatic pressure sensing diaphragm, an elastic element, and a magnetoresistive or silicon resistor or capacitor electrode. The silicone pneumatic pressure sensing diaphragm, elastic element, and magnetoresistive or silicon resistor or capacitor electrode are disposed within the housing. When the gas pressure within the gas collection box changes, the silicone pneumatic pressure sensing diaphragm displaces towards the elastic element, thereby changing the gap between the elastic element and the magnetoresistive or silicon resistor or capacitor electrode, achieving different voltage outputs, and thus obtaining output voltage values ​​corresponding to different liquid levels, thereby realizing liquid level detection. Furthermore, the other end of the gas collection pipe is connected to the gas guide pipe of the pneumatic liquid level detection device via a clamp.

[0012] The above technical solution has the following beneficial effects:

[0013] The gas collection box of this pneumatic liquid level detection device can improve detection accuracy and accurately sense changes in liquid level; enhance stability and reduce external interference; simplify installation and maintenance, reducing costs; have a wide range of applications and can be adapted to various containers; be highly responsive and provide data in a timely manner; and have a simple and reliable structure, reducing the probability of failure and extending service life, thus having significant advantages in many liquid level detection scenarios. Attached Figure Description

[0014] The disclosure of this utility model will become more readily understood by referring to the accompanying drawings. It should be understood that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. In the drawings:

[0015] Figure 1This is a perspective view of the gas collection box in one embodiment of the present invention;

[0016] Figure 2 This is a perspective view of the gas collecting box and container in one embodiment of the present invention;

[0017] Figure 3 This is a schematic diagram of the connection between the air guide tube and the air collecting tube in one embodiment of this utility model.

[0018] Reference table for attached figures:

[0019] 1. Gas collection box; 11. Cup body; 111. Cup mouth; 12. Gas collection pipe; 121. Thread; 2. Gas guide pipe; 3. Container; 4. Pneumatic liquid level detection mechanism; 5. Clamp. Detailed Implementation

[0020] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings.

[0021] It is readily understood that, based on the technical solution of this utility model, various structural and implementation methods can be interchanged by those skilled in the art without altering the essential spirit of this utility model. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative descriptions of the technical solution of this utility model and should not be considered as the entirety of this utility model or as limitations or restrictions on the technical solution of this utility model.

[0022] The directional terms such as up, down, left, right, front, back, front, back, top, and bottom mentioned or possibly used in this specification are defined relative to the structures shown in the accompanying drawings. These are relative concepts and may therefore vary depending on their location and usage. Therefore, these or other directional terms should not be interpreted as restrictive. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meanings of the above-mentioned components within this utility model according to the specific circumstances.

[0024] In some embodiments of this utility model, a hollow cup body and a gas collecting pipe connected to the cup body are included. The bottom of the cup body is provided with a cup opening, which is a water inlet. The gas collecting pipe is located at the upper part of the cup body, with one end connected to the cavity of the cup body and the other end connected to the gas guide pipe of the pneumatic liquid level detection device. When the pneumatic liquid level detection device detects the liquid level of the container, the cup body is placed on the side wall inside the container, and the gas collecting pipe extends out of the container through the side wall. During the detection process, when the liquid level rises to the cup opening, a sealed space is formed inside the gas collecting box. When the liquid level continues to rise, the gas in the gas collecting box is compressed, thereby forming gas pressure.

[0025] Specifically, both the cup body and the gas collecting tube are made of highly corrosion-resistant stainless steel. The cup body is formed by die stamping, followed by grinding and polishing to ensure a smooth inner wall. The gas collecting tube is made by cutting and bending stainless steel tubing. A spout is located at the bottom of the cup body, serving as the water inlet. The gas collecting tube is located at the top of the cup body, with one end welded to the cup body cavity to ensure a tight, leak-free connection. During installation, the cup body is placed on the side wall inside the container, and the gas collecting tube extends outside the container through a pre-drilled hole in the side wall. A rubber sealing ring is installed between the hole and one end of the gas collecting tube to prevent liquid leakage. A thread is provided on the outer wall adjacent to one end of the gas collecting tube, located outside the container. A nut is then used to lock the gas collecting box onto the container, ensuring the cup body's stability. The outer edge of one end of the gas collecting tube matches the shape of the pre-drilled hole on the side wall of the container, ensuring that the cup will not rotate when locked in place. This facilitates installation and ensures the cup opening is horizontally mounted. The other end of the gas collecting tube is connected to the air guide tube of the pneumatic liquid level detection device via a clamp. When the pneumatic liquid level detection device detects the liquid level in the container, the cup is placed on the side wall inside the container. As the liquid level rises, a sealed space is formed inside the gas collecting box when the liquid level reaches the cup opening. As the liquid level continues to rise, the gas in the gas collecting box is compressed, creating pressure. This pressure change is transmitted to the pneumatic liquid level detection device through the gas collecting tube, thus enabling liquid level detection. This gas collecting box design allows for more sensitive sensing of pressure changes caused by liquid level changes, providing more accurate liquid level measurement results. The formation of the sealed space and the selection of high-quality materials ensure stable operation during long-term use, unaffected by external interference. The simple structure and clear installation method reduce the difficulty and cost of installation and maintenance. It can adapt to containers of different types and sizes, as well as various complex working environments.

[0026] In some embodiments of this utility model, the gas collecting pipe extends in an upward inclined manner, and the angle between it and the horizontal direction is an acute angle.

[0027] Specifically, the upward-sloping design of the gas collecting pipe effectively reduces the possibility of liquid accumulation inside the pipe. Even after the test, any residual liquid in the pipe can flow back into the container more smoothly, preventing liquid buildup and ensuring the accuracy of subsequent tests. This sloping design facilitates faster and smoother gas transmission, reducing resistance and pressure loss during transmission, thereby reducing detection errors and improving the accuracy of liquid level detection. The upward slope also reduces the risk of external liquids or impurities entering the gas collecting box through the collecting pipe, providing better protection for the sealed space inside the gas collecting box. When the liquid level rises, the gas is compressed within the gas collecting box. Due to the upward slope of the collecting pipe, the compressed gas can be transmitted more smoothly along the collecting pipe to the gas guide tube of the pneumatic liquid level detection device, reducing obstacles during gas transmission. Simultaneously, when the liquid level drops, any residual liquid in the pipe can flow back along the slope under gravity, ensuring the unobstructed flow of the collecting pipe and preparing for the next liquid level test.

[0028] In some embodiments of this utility model, the cup body and the gas collecting tube are integrally formed.

[0029] Specifically, because the cup body and the gas collecting tube are molded as a single unit, potential gaps and leakage points at the connection points are reduced, greatly improving the overall sealing of the gas collecting box and thus ensuring the accuracy and stability of the test results. The one-piece molding design makes the gas collecting box more robust, able to withstand greater pressure and external impacts, extending its service life. It also reduces assembly steps for components, simplifying the production process and lowering manufacturing costs.

[0030] In some embodiments of this utility model, the height of the cup body is greater than its width.

[0031] Specifically, the taller cup can accommodate a wider range of liquid level changes, improving the device's detection capability under different liquid level conditions. This design makes the cup more stable within the container, less susceptible to water flow fluctuations and container vibrations, thus ensuring the accuracy of the detection results. In containers with limited space, a taller cup with a narrower width can more effectively utilize vertical space, facilitating installation and layout. When detecting liquid levels, because the cup's height is significantly greater than its width, there is more room for gas compression within the cup as the liquid level rises, allowing for a clearer reflection of subtle changes in the liquid level. Simultaneously, the taller cup has a lower center of gravity within the container, enhancing stability and reducing interference from external factors.

[0032] In some embodiments of this utility model, the cup opening is parallel to the horizontal plane.

[0033] Specifically, the parallel alignment of the cup opening with the horizontal plane ensures a more uniform seal as the liquid level rises to the opening, creating a well-sealed space and improving the accuracy and stability of the detection. The parallel cup opening design makes the determination of the liquid level upon reaching the opening clearer, reducing measurement errors caused by cup tilt. During liquid level detection, as the liquid level gradually rises, the parallel alignment of the cup opening with the horizontal plane allows the liquid level to simultaneously contact and seal the entire opening, rapidly and uniformly forming a sealed space inside the gas collection box. This uniform sealing ensures a more stable and predictable gas compression process, thus providing a reliable pressure signal for accurate liquid level detection.

[0034] In some embodiments of this utility model, a gas guide pipe, a pneumatic liquid level detection mechanism, and the aforementioned gas collection box are included. One end of the gas guide pipe is connected to the gas collection box, and the other end is connected to the pneumatic liquid level detection mechanism.

[0035] Specifically, the optimized design of the air collection box, working in conjunction with the air guide pipe and the pneumatic liquid level detection mechanism, accurately detects changes in the liquid level inside the dishwasher, ensuring that the dishwasher operates at the appropriate liquid level and preventing insufficient water or overflow. Accurate liquid level detection helps the dishwasher rationally control water usage, achieving a highly efficient and energy-saving washing process. All components of the entire device work together to maintain stable performance in the complex working environment of the dishwasher, reducing the probability of malfunctions. During dishwasher operation, the air collection box is positioned appropriately within the dishwasher. When the liquid level rises to the rim of the air collection box, a sealed space is formed inside. As the liquid level continues to rise, the gas is compressed, creating a pressure change. This pressure change is transmitted through the air guide pipe to the pneumatic liquid level detection mechanism. The pneumatic liquid level detection mechanism determines the liquid level based on the received pressure signal and controls the dishwasher's water inlet or outlet operations, thereby achieving accurate detection and control of the dishwasher's liquid level.

[0036] In some embodiments of this utility model, the pneumatic liquid level detection mechanism includes a housing, a silicone pneumatic pressure sensing diaphragm, an elastic element, and contacts. The silicone pneumatic pressure sensing diaphragm, the elastic element, and contacts are disposed inside the housing. When the silicone pneumatic pressure sensing diaphragm is displaced towards the elastic element by the compressed air pressure inside the housing, the elastic element is triggered to deform, which in turn drives the contacts to move, thus completing the detection of the liquid level.

[0037] Specifically, when the air pressure inside the air collection box changes, the silicone air pressure sensing diaphragm is displaced towards the elastic element under the pressure of compressed air, triggering the elastic element to deform rapidly. This causes the contacts to actuate, achieving rapid switching on and off, thus responding to and controlling the dishwasher's liquid level in a timely manner. Through the precise coordination of the elastic element and the contacts, the switch state can be accurately controlled according to air pressure changes, improving the accuracy of liquid level detection and control. This structural design ensures good stability and reliability of the pneumatic liquid level detection mechanism during long-term use, reducing the occurrence of misoperation and malfunctions. During the dishwasher's operation, the air pressure inside the air collection box changes with the liquid level. When the air pressure changes, the silicone air pressure sensing diaphragm is displaced towards the elastic element under the pressure of compressed air, causing the elastic element to deform. The deformation of the elastic element actuates the contacts. When the air pressure reaches a certain threshold, the contacts connect or disconnect, thereby controlling the dishwasher's water inlet or outlet, ensuring that the liquid level inside the dishwasher is always maintained within a suitable range.

[0038] Specifically, by precisely adjusting the preload of the elastic element, finer control of liquid level detection accuracy can be achieved to meet the liquid level control accuracy requirements of different dishwashers. The action threshold of the pneumatic liquid level detection mechanism can be adjusted according to the actual operating conditions inside the dishwasher, such as the quantity of items being washed and water pressure, optimizing the overall performance and efficiency of the dishwasher. During use, when it is necessary to adjust the action threshold of the pneumatic liquid level detection mechanism, the adjusting screw is rotated. The movement of the adjusting screw changes the initial compression degree of the elastic element, that is, it changes its preload. When the air pressure in the air collection box changes, the force acting on the elastic element and the preload together determine the degree of deformation of the elastic element and the timing of the contact action, thereby adjusting the action threshold of the pneumatic liquid level detection mechanism to adapt to different liquid level control needs.

[0039] In some embodiments of this utility model, the pneumatic liquid level detection mechanism includes a housing, a silicone pneumatic pressure sensing diaphragm, an elastic element, and a magnetoresistive or silicon resistor or capacitor electrode. The silicone pneumatic pressure sensing diaphragm, the elastic element, and the magnetoresistive or silicon resistor or capacitor electrode are disposed within the housing. When the gas pressure in the gas collection box changes, the silicone pneumatic pressure sensing diaphragm moves toward the elastic element, thereby changing the gap between the elastic element and the magnetoresistive or silicon resistor or capacitor electrode, achieving different voltage outputs, and thus obtaining output voltage values ​​corresponding to different liquid levels, thereby realizing liquid level detection.

[0040] Specifically, different components such as magnetoresistive elements, silicon resistors, or capacitive electrodes can be selected to work with silicone pressure sensing diaphragms for detection. These components all have high precision and stability, and can accurately convert physical quantities into electrical signals based on changes in the gap between the elastic element and them, thereby achieving accurate measurement of the liquid level and meeting the requirements for liquid level detection accuracy.

[0041] In some embodiments of this utility model, the other end of the gas collecting pipe is connected to the gas guiding pipe by a clamp.

[0042] Specifically, the gas collecting pipe and the gas guiding pipe are connected by clamps, which facilitates disassembly and reassembly when the pneumatic liquid level detection device or the gas guiding pipe needs to be replaced or repaired. The clamps also lock the pneumatic liquid level detection device and the gas guiding pipe together, achieving quick connection and fixation.

[0043] The gas collection box of this pneumatic liquid level detection device can improve detection accuracy and accurately sense changes in liquid level; enhance stability and reduce external interference; simplify installation and maintenance, reducing costs; have a wide range of applications and can be adapted to various containers; be highly responsive and provide data in a timely manner; and have a simple and reliable structure, reducing the probability of failure and extending service life, thus having significant advantages in many liquid level detection scenarios.

[0044] The above are merely the principles and preferred embodiments of this utility model. It should be noted that, for those skilled in the art, several other modifications can be made based on the principles of this utility model, and these modifications should also be considered within the scope of protection of this utility model.

Claims

1. A gas collection box for a pneumatic liquid level detection device, characterized in that, The device includes a hollow cup body and a gas collecting pipe connected to the cup body. The bottom of the cup body has a cup opening, which is a water inlet. The gas collecting pipe is located at the top of the cup body, with one end connected to the cavity of the cup body and the other end connected to the gas guide pipe of the pneumatic liquid level detection device. When the pneumatic liquid level detection device detects the liquid level in the container, the cup body is placed on the side wall inside the container, and the gas collecting pipe extends out of the container through the side wall. During the detection process, when the liquid level rises to the cup opening, a sealed space is formed inside the gas collecting box. When the liquid level continues to rise, the gas in the gas collecting box is compressed, thereby forming gas pressure.

2. The gas collection box of the pneumatic liquid level detection device according to claim 1, characterized in that, The gas collecting pipe extends upward at an acute angle to the horizontal.

3. The gas collection box of the pneumatic liquid level detection device according to claim 1, characterized in that, The cup body and the gas collection tube are integrally formed.

4. The gas collection box of the pneumatic liquid level detection device according to claim 1, characterized in that, The height of the cup is greater than its width.

5. The gas collection box of the pneumatic liquid level detection device according to claim 1, characterized in that, The rim of the cup is parallel to the horizontal plane.

6. A pneumatic liquid level detection device for a dishwasher, characterized in that, It includes a vent pipe, a pneumatic liquid level detection mechanism, and a gas collection box as described in any one of claims 1-5, wherein one end of the vent pipe is connected to the gas collection box and the other end is connected to the pneumatic liquid level detection mechanism.

7. The pneumatic liquid level detection device for a dishwasher according to claim 6, characterized in that, The pneumatic liquid level detection mechanism includes a housing, a silicone pneumatic pressure sensing diaphragm, an elastic element, and contacts. The silicone pneumatic pressure sensing diaphragm, the elastic element, and the contacts are disposed inside the housing. When the air pressure in the air collection box changes, the silicone pneumatic pressure sensing diaphragm is displaced towards the elastic element by the compressed air pressure, thereby triggering the elastic element to deform and causing the contacts to move, realizing the switching on and off, and completing the detection of the liquid level.

8. The pneumatic liquid level detection device for a dishwasher according to claim 7, characterized in that, The pneumatic liquid level detection mechanism also includes an adjusting screw. By adjusting the adjusting screw, the preload of the elastic element can be changed, thereby adjusting the action threshold of the pneumatic liquid level detection mechanism.

9. The pneumatic liquid level detection device for a dishwasher according to claim 6, characterized in that, The pneumatic liquid level detection mechanism includes a housing, a silicone pneumatic pressure sensing diaphragm, an elastic element, and a magnetoresistive or silicon resistor or capacitor electrode. The silicone pneumatic pressure sensing diaphragm, the elastic element, and the magnetoresistive or silicon resistor or capacitor electrode are disposed inside the housing. When the air pressure in the gas collection box changes, the silicone pneumatic pressure sensing diaphragm moves toward the elastic element, thereby changing the gap between the elastic element and the magnetoresistive or silicon resistor or capacitor electrode, realizing different voltage outputs, and thus obtaining output voltage values ​​corresponding to different liquid levels, thereby realizing liquid level detection.

10. The pneumatic liquid level detection device for a dishwasher according to claim 7, characterized in that, The other end of the gas collecting pipe is connected to the gas guiding pipe by a clamp.

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