Liquid level detection device for household appliances

Abstract

The utility model discloses a liquid level detection device for household appliances, and relates to the technical field of household appliances, the liquid level detection device comprises a household appliance body and a liquid level detection assembly used for detecting the liquid level in the household appliance body, a roller is integrally formed in the household appliance body, and through holes are uniformly distributed in the roller; the liquid level detection assembly comprises a first box body and a second box body, L-shaped rods inserted into the four adjacent through holes are connected to the periphery of the first box body and the periphery of the second box body in an inserted mode, and a capacitance sensor is installed on the inner wall of the second box body. According to the utility model, the second box body and the capacitive sensor and the second electrode on the second box body are arranged on the four adjacent through holes on the roller in the household appliance body through the four L-shaped rods, and the first box body and the first electrode on the first box body are arranged on the roller in a similar way and are far away from the second box body and the second electrode; the water contacts and covers the first electrode and the second electrode, so that the capacitance value between the first electrode and the second electrode is changed, and high-precision liquid level detection is facilitated.

Description

Technical Field

[0001] The utility model belongs to the technical field of household appliances, and in particular relates to a liquid level detection device for household appliances. Background Art

[0002] Traditional washing machine liquid level detection mostly relies on LC oscillation circuits or float switches. Although these methods are feasible to a certain extent, they have problems such as low accuracy, easy wear, and difficult maintenance. With the development of technology, a more advanced, stable and accurate liquid level detection device is needed to improve the performance and user experience of washing machines.

[0003] The Chinese patent with patent number CN202020207388.3 discloses a liquid level detection device for household appliances, including an upper cover, a sealing plate, a lower shell and a pressure sensor. The pressure sensor is fixed inside the lower shell, the top of the lower shell is connected to the sealing plate, and the top of the lower shell is also connected to the upper cover. The sealing plate is located between the lower shell and the upper cover. A closed cavity is provided between the upper cover and the sealing plate. The sealing plate is provided with a circulation pipe below the closed cavity. The circulation pipe corresponds to the stress area of ​​the pressure sensor, and an air inlet is provided on the closed cavity. During water level detection, the internal air pressure of the air hose increases, and the gas is blown to the stress area of ​​the pressure sensor through the closed cavity and the circulation pipe. The liquid level height of the washing machine can be obtained according to the electrical signal output by the pressure sensor.

[0004] However, in the implementation of relevant technologies, it was found that the above-designed liquid level detection device for household appliances has the following problems: pressure sensors are usually more complex and more expensive than capacitive sensors. Pressure sensors require precise mechanical structures and circuits to accurately measure pressure changes, and require a certain amount of time to respond to pressure changes, especially in the case of rapidly changing liquid levels. In contrast, capacitive sensing technology usually has a faster response speed and can capture liquid level changes more promptly. The accuracy of pressure sensors may be affected by environmental factors such as temperature and humidity, while capacitive sensing technology is usually more stable to these environmental factors and can maintain high measurement accuracy in different environments. In view of this, a liquid level detection device for household appliances is provided to overcome the above-mentioned defects. Utility Model Content

[0005] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a liquid level detection device for household appliances to achieve the purpose of high-precision liquid level detection.

[0006] In order to solve the above technical problems, the utility model provides a liquid level detection device for household appliances, comprising a household appliance body and a liquid level detection component for detecting the liquid level in the household appliance body, the interior of the household appliance body is integrally formed with a roller, and the roller is evenly distributed with through holes, the liquid level detection component comprises a first box body and a second box body, the first box body and the second box body are both surrounded by L-shaped rods inserted into four adjacent through holes, a capacitive sensor is installed on the inner wall of the second box body, the first box body and the second box body are respectively installed with a first electrode and a second electrode electrically connected to the capacitive sensor, and the first box body and the second box body are both provided with a positioning component for positioning the L-shaped rod.

[0007] Furthermore, the positioning assembly includes a ratchet rotatably connected to the top of the L-shaped rod, the top of the ratchet is provided with an arc-shaped guide groove in a circular array, the inner wall of the arc-shaped guide groove is slidably connected to a limiting cylinder connected to one end of the L-shaped rod, the inner bottom walls of the first box body and the second box body are both equipped with a rotating shaft, the top end of the rotating shaft is rotatably connected to a ratchet tooth meshing with the ratchet, the outer sleeve of the rotating shaft is provided with a torsion spring which makes the ratchet tooth and the ratchet wheel tightly attached in the initial state, and the two ends of the torsion spring are respectively connected to the rotating shaft and the ratchet tooth.

[0008] Furthermore, the first box body and the second box body are both made of carbon fiber, and slots are provided around the first box body and the second box body. Sealing rings are installed on the inner walls of the slots, and the inner walls of the sealing rings are in close contact with the outer walls of the L-shaped rods.

[0009] Furthermore, a door body is hinged on the front side of the home appliance body, an opening and closing lock is integrally formed on the door body, and an observation window is integrally formed on the front side of the door body.

[0010] Furthermore, a control panel is installed on the front side of the home appliance body, and a display panel close to the control panel is also installed on the front side of the home appliance body, and the display panel and the capacitive sensor are both electrically connected to the control panel.

[0011] Furthermore, a plurality of equally spaced anti-slip grooves are integrally formed on both sides of the home appliance body, a plurality of shock-absorbing bases are installed at the bottom of the home appliance body, and four of the shock-absorbing bases are respectively located at the four corners of the bottom of the home appliance body.

[0012] After adopting the above technical scheme, the utility model has the following beneficial effects compared with the prior art.

[0013] 1. In the utility model, the second box body and the capacitive sensor and the second electrode thereon are installed on four adjacent through holes on the drum in the home appliance body through four L-shaped rods. The first box body and the first electrode thereon are similarly installed on the drum and away from the second box body and the second electrode. When the water level in the drum rises, the water will contact and cover the first electrode and the second electrode, thereby changing the capacitance value between them for high-precision liquid level detection.

[0014] 2. In the utility model, four L-shaped rods are inserted into four adjacent through holes on the drum, and the four L-shaped rods on the first box body and the second box body are squeezed inward respectively. At the same time, the four L-shaped rods on the first box body and the second box body are linked by using the ratchet, the limiting cylinder and the arc-shaped guide groove, and the elasticity of the torsion spring is used to make the ratchet on the rotating shaft clamp the ratchet, and then the first box body and the second box body are fixed and prevented from falling off through the through holes and the L-shaped rods, and the linkage and coordination of the four L-shaped rods has a good fixing effect, ensuring the subsequent normal use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation on the present invention. Obviously, the accompanying drawings described below are only some embodiments. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work. In the accompanying drawings:

[0016] Figure 1 This is a schematic structural diagram of a household appliance body in a liquid level detection device for household appliances according to the utility model;

[0017] Figure 2 This is a structural schematic diagram of a liquid level detection component in a liquid level detection device for household appliances according to the utility model;

[0018] Figure 3 This is a schematic diagram of the internal structure of a second box body in a liquid level detection device for household appliances of the utility model;

[0019] Figure 4 for Figure 1 A magnified view of the structure at center.

[0020] Numbers in the figure:

[0021] 1. Appliance body; 2. Drum; 3. Through hole;

[0022] 4. Liquid level detection assembly; 401. First box body; 402. Second box body; 403. Capacitive sensor; 404. First electrode; 405. Second electrode; 406. L-shaped rod;

[0023] 5. Positioning assembly; 501. ratchet; 502. limiting cylinder; 503. arc guide groove; 504. rotating shaft; 505. ratchet; 506. torsion spring;

[0024] 6. Slot; 7. Door body; 8. Opening and closing lock; 9. Control panel; 10. Display panel; 11. Anti-slip groove; 12. Shock-absorbing base.

[0025] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but rather to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. The following embodiments are used to illustrate the utility model but are not used to limit the scope of the utility model.

[0027] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] An existing liquid level detection device for household appliances has the following problems: pressure sensors are usually more complex and more expensive than capacitive sensors. Pressure sensors require precise mechanical structures and circuits to accurately measure pressure changes, and require a certain amount of time to respond to pressure changes, especially in the case of rapidly changing liquid levels. In contrast, capacitive sensing technology usually has a faster response speed and can capture liquid level changes more promptly. The accuracy of pressure sensors may be affected by environmental factors such as temperature and humidity, while capacitive sensing technology is usually more stable to these environmental factors and can maintain high measurement accuracy in different environments.

[0030] Embodiment 1

[0031] Depend on Figure 1-Figure 4 The utility model provides a liquid level detection device for household appliances.

[0032] Specifically, by Figure 1 -

[0033] Figure 4 The invention provides a household appliance body 1 and a liquid level detection component 4 for detecting the liquid level in the household appliance body 1. A roller 2 is integrally formed inside the household appliance body 1, and through holes 3 are evenly distributed on the roller 2. The liquid level detection component 4 includes a first box body 401 and a second box body 402. L-shaped rods 406 inserted into four adjacent through holes 3 are inserted around the first box body 401 and the second box body 402. A capacitive sensor 403 is installed on the inner wall of the second box body 402. A first electrode 404 and a second electrode 405 electrically connected to the capacitive sensor 403 are installed on the first box body 401 and the second box body 402, respectively. A positioning component 5 for positioning the L-shaped rod 406 is arranged inside the first box body 401 and the second box body 402.

[0034] The first box body 401 and the second box body 402 are both made of carbon fiber. Slots 6 are provided around the first box body 401 and the second box body 402. A sealing ring is installed on the inner wall of the slot 6. The inner wall of the sealing ring is in close contact with the outer wall of the L-shaped rod 406. The carbon fiber material has light specific gravity, high strength, high temperature resistance, corrosion resistance and easy processing, thereby making the first box body 401 and the second box body 402 lighter and extending the service life of the two. A door body 7 is hinged on the front side of the home appliance body 1, and an opening and closing lock 8 is integrally formed on the door body 7. The front side of the home appliance body 7 is integrally formed with an observation window. By providing a door body 7 and an opening and closing lock 8, it is convenient to take and put clothes and install the liquid level detection component 4 and the positioning component 5. By providing an observation window, it is convenient to observe the internal situation of the home appliance body 1; a control panel 9 is installed on the front side of the home appliance body 1, and a display panel 10 close to the control panel 9 is also installed on the front side of the home appliance body 1. The display panel 10 and the capacitive sensor 403 are electrically connected to the control panel 9. The capacitive sensor 403 displays the digital height of the liquid level on the display panel 10 through the control panel 9, so that the relevant user can understand the liquid level situation in the home appliance body 1 at any time; both sides of the home appliance body 1 are integrally formed with a plurality of equally spaced anti-skid grooves 11, and a plurality of shock-absorbing bases 12 are installed at the bottom of the home appliance body 1. The four shock-absorbing bases 12 are respectively located at the four corners of the bottom of the home appliance body 1. By providing the anti-skid grooves 11, the friction between the human hand and the home appliance body 1 is increased, so as to facilitate the movement of the home appliance body 1. By providing the shock-absorbing base 12, the home appliance body 1 is damped during operation, the noise is reduced, and the home appliance body is extended. The service life of the body 1; the second box body 402 and the capacitive sensor 403 and the second electrode 405 thereon are installed on the four adjacent through holes 3 on the drum 2 in the home appliance body 1 through four L-shaped rods 406, and the first box body 401 and the first electrode 404 thereon are similarly installed on the drum 2 and away from the second box body 402 and the second electrode 405. When the water level in the drum 2 rises, the water will contact and cover the first electrode 404 and the second electrode 405, thereby changing the capacitance value between them for high-precision liquid level detection.

[0035] Embodiment 2

[0036] On the basis of the first embodiment, further, as a specific implementation of the present utility model, the present utility model provides a liquid level detection device for household appliances.

[0037] Specifically, by Figure 3It is given that the positioning assembly 5 includes a ratchet 501 rotatably connected to the top of the L-shaped rod 406, the top of the ratchet 501 is provided with an arc-shaped guide groove 503 in a ring array, the inner wall of the arc-shaped guide groove 503 is slidably connected with a limiting cylinder 502 connected to one end of the L-shaped rod 406, the inner bottom wall of the first box body 401 and the second box body 402 are both installed with a rotating shaft 504, the top of the rotating shaft 504 is rotatably connected with a ratchet 505 meshing with the ratchet 501, the outer sleeve of the rotating shaft 504 is provided with a torsion spring 506 which makes the ratchet 505 close to the ratchet 501 in the initial state, and the two ends of the torsion spring 506 are respectively connected to the rotating shaft 504 and the ratchet 505;

[0038] The four L-shaped rods 406 are inserted into the four adjacent through holes 3 on the drum 2, and the four L-shaped rods 406 on the first box body 401 and the second box body 402 are squeezed inward respectively, and the four L-shaped rods 406 on the first box body 401 and the second box body 402 are linked by using the ratchet 501, the limiting cylinder 502 and the arc guide groove 503, and the elasticity of the torsion spring 506 is used to make the ratchet 505 on the rotating shaft 504 clamp the ratchet 501, and then the first box body 401 and the second box body 402 are fixed and prevented from falling off through the through holes 3 and the L-shaped rods 406, and the linkage and coordination of the four L-shaped rods 406 has a good fixing effect, ensuring the subsequent normal use.

[0039] Working principle:

[0040] The second box body 402 and the capacitive sensor 403 and the second electrode 405 thereon are installed on the four adjacent through holes 3 on the drum 2 in the home appliance body 1 through four L-shaped rods 406. The first box body 401 and the first electrode 404 thereon are similarly installed on the drum 2 and away from the second box body 402 and the second electrode 405. When the water level in the drum 2 rises, the water will contact and cover the first electrode 404 and the second electrode 405, thereby changing the capacitance value between them for high-precision liquid level detection. Specifically, a capacitor and a frequency meter connected in parallel with the capacitive sensor 403 are provided in the first box body 401 to measure the resonant frequency or charging and discharging time of the parallel capacitor. The change in capacitance needs to be converted into a measurable current signal, and a capacitor-

[0041] The voltage converter is interpreted as water level information by the control panel 9, and the interpreted water level information is displayed on the display panel 10 of the home appliance body 1, and the operation of the home appliance body 1 is controlled accordingly, such as starting washing, adding detergent and draining.

[0042] The four L-shaped rods 406 are inserted into the four adjacent through holes 3 on the drum 2, and the four L-shaped rods 406 on the first box body 401 and the second box body 402 are squeezed inward respectively, and the four L-shaped rods 406 on the first box body 401 and the second box body 402 are linked by using the ratchet 501, the limiting cylinder 502 and the arc guide groove 503, and the elasticity of the torsion spring 506 is used to make the ratchet 505 on the rotating shaft 504 clamp the ratchet 501, and then the first box body 401 and the second box body 402 are fixed and prevented from falling off through the through holes 3 and the L-shaped rods 406, and the linkage and coordination of the four L-shaped rods 406 has a good fixing effect, ensuring the subsequent normal use.

[0043] The above is only a preferred embodiment of the present invention, and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with this patent can make some changes or modifications to equivalent embodiments of equivalent changes using the technical content suggested above without departing from the scope of the technical solution of the present invention. The implementation schemes in the above embodiments can also be further combined or replaced. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the present invention.

Claims

1. A liquid level detection device for household appliances, comprising: Home appliance body (1); A liquid level detection component (4) for detecting the liquid level in a household appliance body (1); The invention is characterized in that a roller (2) is integrally formed inside the home appliance body (1), and through holes (3) are evenly distributed on the roller (2); the liquid level detection component (4) comprises a first box body (401) and a second box body (402); L-shaped rods (406) inserted into four adjacent through holes (3) are inserted around the first box body (401) and the second box body (402); a capacitive sensor (403) is installed on the inner wall of the second box body (402); a first electrode (404) and a second electrode (405) electrically connected to the capacitive sensor (403) are installed on the first box body (401) and the second box body (402), respectively; and a positioning component (5) for positioning the L-shaped rod (406) is arranged inside the first box body (401) and the second box body (402).

2. A liquid level detection device for household appliances according to claim 1, characterized in that: The positioning assembly (5) comprises a ratchet (501) rotatably connected to the top of the L-shaped rod (406); the top of the ratchet (501) is provided with an arc-shaped guide groove (503) in a ring array; the inner wall of the arc-shaped guide groove (503) is slidably connected with a limiting cylinder (502) connected to one end of the L-shaped rod (406); the inner bottom walls of the first box body (401) and the second box body (402) are both provided with a rotating shaft (504); the top of the rotating shaft (504) is rotatably connected with a ratchet (505) meshing with the ratchet (501); the outer sleeve of the rotating shaft (504) is provided with a torsion spring (506) which makes the ratchet (505) and the ratchet (501) tightly attached in an initial state; the two ends of the torsion spring (506) are respectively connected to the rotating shaft (504) and the ratchet (505).

3. A liquid level detection device for household appliances according to claim 2, characterized in that: The first box body (401) and the second box body (402) are both made of carbon fiber. Slots (6) are provided around the first box body (401) and the second box body (402). A sealing ring is installed on the inner wall of the slot (6). The inner wall of the sealing ring is in close contact with the outer wall of the L-shaped rod (406).

4. A liquid level detection device for household appliances according to claim 3, characterized in that: A door body (7) is hingedly connected to the front side of the home appliance body (1); an opening and closing lock component (8) is integrally formed on the door body (7); and an observation window is integrally formed on the front side of the door body (7).

5. A liquid level detection device for household appliances according to claim 4, characterized in that: A control panel (9) is installed on the front side of the home appliance body (1), and a display panel (10) close to the control panel (9) is also installed on the front side of the home appliance body (1), and the display panel (10) and the capacitive sensor (403) are both electrically connected to the control panel (9).

6. A liquid level detection device for household appliances according to claim 5, characterized in that: Both sides of the home appliance body (1) are integrally formed with a plurality of anti-slip grooves (11) at equal intervals, and the bottom of the home appliance body (1) is provided with a plurality of shock-absorbing bases (12), wherein the four shock-absorbing bases (12) are respectively located at the four corners of the bottom of the home appliance body (1).

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