Liquid level early warning device, water pan formed by liquid level early warning device and air conditioner

Abstract

The utility model provides a liquid level early warning device and a water pan and an air conditioner formed thereof.The liquid level early warning device comprises a rotating rod, a buoy is arranged at the first end of the rotating rod, the second end of the rotating rod abuts against a metal pressing piece, a fixing point is arranged between the first end and the second end of the rotating rod, and the rotating rod is fixed in a container to be measured through the fixing point; the buoy is arranged on the liquid surface of a to-be-detected container; the rotating rod rotates around a fixed point due to the buoyancy of different liquid levels in the container to be measured on the buoy; the early warning circuit comprises an early warning switch, the early warning switch comprises a metal pressing piece and a contact, and the second end of the rotating rod drives the metal pressing piece to abut against or be disconnected from the contact. The state of the metal pressing piece and the state of the contact are driven by the rotating rod to change, so that connection and disconnection of the early warning circuit are achieved, the structure is simple, the occupied area is small, and the liquid level early warning device is suitable for being installed in a to-be-detected container with a small space to achieve liquid level early warning.

Description

Technical Field

[0001] This utility model relates to the technical field of liquid level warning devices, and in particular to a liquid level warning device and the water receiving tray and air conditioner formed therefrom. Background Technology

[0002] Drain trays in electrical appliances are used to collect condensate or other discharged liquids generated during operation. For example, air conditioner drain trays collect condensate from the evaporator and its duct components during cooling. The drain tray is generally a tray-like structure with a certain depth. Discharged liquid water drips into the tray along a pre-defined drainage channel. The bottom of the tray is tilted to one side to guide the water to a collection point, from which it drains through an opening below the collection point via a drain pipe. In actual use, due to factors such as blockage in the drain pipe, water in the drain tray cannot be effectively discharged, eventually causing the water level to overflow, leading to leaks in the appliance and electrical safety issues.

[0003] To prevent leaks caused by excessively high liquid levels in the drain pan, a warning water level needs to be set inside the drain pan. When a drainage problem causes the water level to rise to the warning level, an external warning will be issued. Since the drain pans are all built into the electrical components, the water level inside cannot be directly observed from the outside of the product. Therefore, monitoring the water level requires the installation of sensors or other equipment.

[0004] Existing liquid level warning devices include sensor-type warning devices and buoy-type warning devices. Among them, the water droplets that drip continuously during the operation of electrical appliances can cause electrical safety hazards. Electromagnetic sensors and pressure sensors are prone to current leakage and are not suitable for installation in water collection pans.

[0005] Existing buoy-type warning devices are bulky. For example, CN221260030U discloses an automatic water level monitoring and alarm device, which includes a fixed base plate, a water cup mounted on the rear end of the top of the fixed base plate, a first support rod mounted on the top of the fixed base plate in front of the water cup, a lever mounted on the top of the first support rod, a connecting rod mounted on the rear end of the lever, a float mounted at the bottom end of the connecting rod inside the water cup, a sensing rod mounted on the front end of the lever, a second support rod mounted on the front end of the top of the fixed base plate, a first water level stop and a second water level stop mounted on the top of the second support rod, a power supply mounted on the left side of the top of the fixed base plate, and a switch mounted on the top of the fixed base plate in front of the power supply. This automatic water level monitoring and alarm device has a complex structure and occupies a large area, making it only suitable for teaching demonstrations and unsuitable for spaces with high sealing requirements and small size. For example, the deepest part of the water tray is only 3-5cm, and the available installation space is extremely limited. Therefore, it is necessary to find a new liquid level warning device that can be installed in confined spaces. Summary of the Invention

[0006] To overcome the problems existing in related technologies, one of the objectives of this utility model is to provide a liquid level warning device. By rotating the rod, the state of the metal pressure plate and the contact point changes, thereby realizing the connection and disconnection of the warning circuit. The structure is simple and occupies a small area, making it suitable for installation in a small container to achieve liquid level warning. This avoids the shortcomings of existing warning devices, which have a large structure and can only be installed on the outside of the container to be tested.

[0007] A liquid level warning device, comprising:

[0008] A rotating rod is provided with a float at its first end and abuts against a metal pressure plate at its second end. A fixed point is provided between the first and second ends of the rotating rod, and the rotating rod is fixed in the container to be tested through the fixed point. The float is used to be placed on the liquid surface of the container to be tested. The buoyancy of the float on the different liquid levels in the container to be tested causes the rotating rod to rotate around the fixed point.

[0009] The warning circuit includes a warning switch, which includes a metal pressure plate and a contact. The second end of the rotating rod drives the metal pressure plate to abut or disconnect from the contact.

[0010] This application has a simple structure and a small footprint, making it suitable for installation in a small container to achieve liquid level warning, thus avoiding the shortcomings of existing warning devices that have a large structure and can only be installed on the outside of the container to be tested.

[0011] In a preferred embodiment of this invention, the fixing point is located above the liquid surface of the container to be tested, and the fixing point does not coincide with the center of gravity of the rotating rod.

[0012] The advantages of having a fixed point that does not coincide with the center of gravity are as follows: In addition to being driven by the buoy, the rotating rod is also subject to gravity. Gravity can ensure that the rotating rod is reset better when the liquid level drops, thus ensuring the accuracy of the liquid level warning device.

[0013] In a preferred embodiment of this invention, the fixing point is located on the side of the rotating rod away from the buoy, where the center of gravity is located.

[0014] By setting the center of gravity of the fixed point and the rotating rod, this application can ensure that the rotating rod is always subjected to the effects of gravity and buoyancy. Through two opposing driving forces, the rotating rod keeps rotating clockwise and counterclockwise, thereby ensuring that the float is always level with the liquid surface and that the liquid level warning device can accurately reflect the position of the liquid surface.

[0015] In a preferred embodiment of this invention, an electrical box is also included. The warning circuit is located inside the electrical box. The electrical box is located at the end of the rotating rod away from the liquid surface of the container to be tested. The contact is fixed inside the electrical box. One end of the metal pressure plate is fixed inside the electrical box, and the other end of the metal pressure plate slides against the second end of the rotating rod.

[0016] In a preferred embodiment of this invention, the projection of the metal pressure plate onto a first plane inside the electrical box covers the contact point. The first plane refers to a plane in the electrical box that is parallel to the liquid surface of the container to be tested.

[0017] This application, through the contact pressing plate and the position setting of the contact, can ensure that the warning switch is adjacent to the rotating rod, thereby ensuring that the liquid level warning device has a minimal size, making it suitable for installation in narrow spaces.

[0018] In a preferred embodiment of this invention, a limiting member is further included. The limiting member is located on the outside of the rotating rod and is used to limit the second end of the rotating rod to always abut against the metal pressure plate.

[0019] In a preferred embodiment of this invention, the limiting member is a limiting through hole, the rotating rod passes through the limiting through hole, and the limiting through hole is located on the side of the fixing point closer to the buoy.

[0020] Since the rotating rod is located inside the limiting through hole, when the rotating rod rotates to the edge of the limiting through hole, it will be subjected to the force of the limiting through hole, which will prevent the rotating rod from rotating further. This will limit the rotation of the rotating rod to a certain range and ensure that the metal pressure plate always abuts against the second end of the rotating rod.

[0021] In a preferred embodiment of this utility model, a housing is also included. The housing includes a mounting base plate and at least one mounting side plate. The mounting base plate and the mounting side plate form a mounting cavity. The second end and the fixing point of the rotating rod are located inside the mounting cavity. The buoy is located outside the mounting cavity. A limit hole is provided in the mounting base plate.

[0022] This application utilizes a mounting base plate to form a limiting through hole, which can both limit the rotation range of the rotating rod and provide sealing protection for the warning switch and the second end of the rotating rod. The mounting base plate and the mounting side plate can be sealed with sealant to achieve sealing protection.

[0023] This application also provides a water receiving tray, including a liquid level warning device as described above.

[0024] This application also provides an air conditioner, including the water tray described above.

[0025] The beneficial effects of this utility model are as follows:

[0026] This utility model provides a liquid level warning device, in which a rotating rod is fixed in the container to be tested by a fixed point. The first end and the second end of the rotating rod are located on both sides of the fixed point. The first end of the rotating rod is equipped with a float, which is used to place on the liquid surface of the container to be tested. The second end of the rotating rod abuts against a metal pressure plate. When the liquid level in the container to be tested is different, the buoyancy of the liquid on the float causes the position of the float to change, thereby driving the rotating rod to rotate around the fixed point, causing the position of the second end of the rotating rod to rotate accordingly. Since the first end of the rotating rod is always in contact with the metal pressure plate, the position of the metal pressure plate also changes accordingly, so as to realize the opening or closing of the metal pressure plate and the contact. When the metal pressure plate is disconnected from the contact, the warning circuit is disconnected; when the metal pressure plate and the contact are in contact, the warning circuit is turned on. By checking whether the warning circuit is turned on or off, it can be determined whether the liquid level in the container to be tested has reached the preset height, thereby realizing the warning of liquid level height. This application uses a lever principle to control the warning switch. When the second end of the rotating rod rotates around a fixed point under the drive of the first end, the position of the metal pressure plate changes accordingly. The change in the position of the metal pressure plate changes its contact state with the contact point, thereby realizing the liquid level warning function. This application has a simple structure and a small footprint, making it suitable for installation in a small container to achieve liquid level warning. It avoids the shortcomings of existing warning devices, which have a large structure and can only be installed on the outside of the container to be tested.

[0027] This application also provides a water receiving tray that includes the above-mentioned liquid level warning device. In this application, the liquid level warning device can be installed in a water receiving tray with limited space to warn of the water level in the water receiving tray and prevent liquid overflow caused by blockage of the drain outlet of the water receiving tray.

[0028] This application also provides an air conditioner including the above-mentioned water tray. When the liquid level in the water tray is too high, the warning circuit will issue a warning and conduct a fault check on the water tray to avoid liquid overflow from the water tray causing air conditioner electrical failure, thereby improving the service life and operational stability of the air conditioner. Attached Figure Description

[0029] Figure 1 This is an overall assembly drawing of the liquid level warning device of this application;

[0030] Figure 2 This is a schematic diagram of one side of the liquid level warning device in this application;

[0031] Figure 3 This is a schematic diagram of another side view of the liquid level warning device of this application;

[0032] Figure 4 This is a top view of the liquid level warning device of this application;

[0033] Figure 5 This is a schematic diagram showing the force on the rotating rod when the metal pressure plate and the contact point abut in this application;

[0034] Figure 6 This is a schematic diagram showing the forces acting on the rotating rod when the metal pressure plate and the contact separate in this application;

[0035] Figure 7 This is a circuit diagram of the early warning circuit of this application.

[0036] Reference numerals: 11. First mounting plate; 111. Mounting hole; 12. Second mounting plate; 13. Third mounting plate; 14. Fourth mounting plate; 15. Fifth mounting plate; 16. Mounting base plate; 161. Limiting through hole; 2. Electrical box; 20. Warning switch; 21. Metal pressure plate; 22. Contact; 23. Warning light; 24. Warning resistor; 25. Power supply; 3. Rotating rod; 31. Buoy; 32. Rotating shaft. Detailed Implementation

[0037] Preferred embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. While preferred embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention will be thorough and complete, and will fully convey the scope of the present invention to those skilled in the art.

[0038] The terminology used in this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular forms “a,” “the,” and “the” used in this invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0039] It should be understood that although the terms "first," "second," "third," etc., may be used in this invention to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this invention, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Thus, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0040] Example 1

[0041] like Figures 1-4As shown, the liquid level warning device provided in this application includes:

[0042] A rotating rod 3 has a float 31 at its first end and a metal pressure plate 21 at its second end. A fixed point is provided between the first and second ends of the rotating rod 3, and the rotating rod 3 is fixed in the container to be tested through the fixed point. The float 31 is used to be placed on the liquid surface of the container to be tested. The buoyancy of the float 31 caused by different liquid levels in the container to cause the rotating rod 3 to rotate around the fixed point.

[0043] The warning circuit includes a warning switch 20, which includes a metal pressure plate 21 and a contact 22. The second end of the rotating rod 3 drives the metal pressure plate 21 to abut or disconnect from the contact 22.

[0044] In this application, the density of the buoy 31 can be less than the density of the liquid in the container to be tested, ensuring that the buoy 31 always floats on the liquid surface.

[0045] In this application, the rotating rod 3 is preferably in an inclined state, so that the upward buoyancy force on the buoy 31 can cause the rotating rod 3 to rotate around the fixed point.

[0046] In this application, the container to be tested can be any container that needs to be tested for liquid level. Since this application only requires the rotation of the rotating rod 3 to achieve liquid level monitoring, it is especially suitable for monitoring inside small containers, such as the container that can be installed inside an air conditioner drip tray for liquid level monitoring.

[0047] To further reduce the size of the liquid level warning device, this application allows the rotating rod 3 to directly abut against the warning switch 20. The opening and closing of the warning switch 20 is achieved by changing the position of the rotating rod 3, thereby connecting or disconnecting the warning circuit. For example, when the second end of the rotating rod 3 causes the metal pressure plate 21 to separate from the contact 22, the warning switch 20 is open, and the warning circuit is disconnected. When the second end of the rotating rod 3 causes the metal pressure plate 21 to abut against the contact 22, the warning switch 20 is closed, and the warning circuit is connected. A warning device, such as a buzzer, can be installed in the warning circuit to make the status of the warning circuit visible.

[0048] In this application, the rotating rod 3 is fixed in the container to be tested by a fixed point. The first end and the second end of the rotating rod 3 are located on both sides of the fixed point. The first end of the rotating rod 3 is provided with a float 31, which is used to place on the liquid surface of the container to be tested. The second end of the rotating rod 3 abuts against the metal pressure plate 21. When the liquid level in the container to be tested is different, the buoyancy of the liquid surface on the float 31 causes the position of the float 31 to change, thereby driving the rotating rod 3 to rotate around the fixed point, and causing the position of the second end of the rotating rod 3 to rotate accordingly. Since the first end of the rotating rod 3 is always in contact with the metal pressure plate 21, the position of the metal pressure plate 21 also changes accordingly, so as to realize the opening or closing of the metal pressure plate 21 and the contact 22. When the metal pressure plate 21 is disconnected from the contact 22, the warning circuit is disconnected. When the metal pressure plate 21 and the contact 22 are in contact, the warning circuit is turned on. By checking whether the warning circuit is turned on or off, it can be determined whether the liquid level in the container to be tested has reached the preset height, thereby realizing the warning of the liquid level height. In this application, the rotating rod 3 uses the lever principle to control the warning switch 20. When the second end of the rotating rod 3 rotates around the fixed point under the drive of the first end, the position of the metal pressure plate 21 changes accordingly. The change in the position of the metal pressure plate 21 causes a change in its contact state with the contact point 22, thereby realizing the liquid level warning function. This application has a simple structure and a small footprint, making it suitable for installation in a small container to achieve liquid level warning. It avoids the shortcomings of existing warning devices, which have a large structure and can only be installed on the outside of the container to be tested.

[0049] Example 2

[0050] like Figures 1-4 As shown, the liquid level warning device provided in this application includes a rotating rod 3 and a warning circuit. The warning circuit includes a warning switch 20, which includes a metal pressure plate 21 and a contact 22. The second end of the rotating rod 3 drives the metal pressure plate 21 to abut or disconnect from the contact 22.

[0051] The rotating rod 3 has a float 31 at its first end and a metal pressure plate 21 at its second end. A fixed point is provided between the first and second ends of the rotating rod 3. The rotating rod 3 is fixed in the container to be tested through the fixed point. The float 31 is used to be placed on the liquid surface of the container to be tested. The buoyancy of the float 31 on the different liquid levels in the container to be tested causes the rotating rod 3 to rotate around the fixed point.

[0052] Preferably, in this application, the fixing point is positioned above the liquid surface of the container to be tested. The fixing point can be hinged to the rotating shaft 32, and the rotating shaft is then fixed in the container to be tested via the rotating shaft 32. The rotating rod 3 is placed at an angle, and a float 31 is provided at the first end of the rotating rod 3, i.e., the bottom of the rotating rod 3. The float 31 is located on the liquid surface and rises and falls with the liquid level. The second end of the rotating rod 3, i.e., the top of the rotating rod 3, is always in contact with the metal pressure plate 21. When the float 31 rises and falls with the liquid level, the rotating rod 3 rotates around the fixing point, causing the second end of the rotating rod 3 to change the position of the metal pressure plate 21.

[0053] In this application, the fixed point is not aligned with the center of gravity of the rotating rod 3. The center of gravity of the rotating rod 3 is the point where gravity acts on the rotating rod 3. The fact that the fixed point is not aligned with the center of gravity has the following advantages: in addition to the driving force of the float 31, the rotating rod 3 is also subject to gravity. Gravity helps ensure that the rotating rod 3 returns to its original position better when the liquid level drops, thus ensuring the accuracy of the liquid level warning device.

[0054] Preferably, in this application, the fixing point is located on the side of the rotating rod 3 away from the center of gravity of the buoy 31. That is, when the rotating rod 3 is tilted, the buoy 31 is set at the first end of the rotating rod 3, that is, the bottom of the rotating rod 3. The second end of the rotating rod 3, that is, the top of the rotating rod 3, is always in contact with the metal pressure plate 21. Fixing points are provided at the first and second ends of the rotating rod 3, and the fixing points are located above the center of gravity. In this way, even if the buoy 31 is not in the liquid, the rotating rod 3 has a tendency to rotate vertically under the action of gravity. At the same time, the metal pressure plate 21 is fixed in the electrical box 2 above the rotating rod 3, and the tendency of the rotating rod 3 to rotate vertically ensures that the second end of the rotating rod 3 is always in contact with the metal pressure plate 21.

[0055] Furthermore, as the buoy 31 descends with the liquid level, the rotating rod 3, under its own gravity, ensures that the buoy 31 descends with the liquid level and remains level with the liquid level. This causes the rotating rod 3 to be subjected to forces in two different directions: gravity and buoyancy of the buoy 31. The rotating rod 3 rotates effectively clockwise and counterclockwise in the same position.

[0056] This application, through the setting of the fixed point and the center of gravity position of the rotating rod 3, ensures that the rotating rod 3 is always subjected to the forces of gravity and buoyancy of the float 31. Two opposing driving forces cause the rotating rod 3 to rotate clockwise and counterclockwise, thereby ensuring that the float remains level with the liquid surface and that the liquid level warning device can accurately reflect the liquid level position. Furthermore, the rotating rod 3 and the warning switch 20 are arranged sequentially, and the rotating rod 3 can be partially submerged inside the container being tested, resulting in a smaller overall size, making it suitable for installation in confined spaces for liquid level monitoring.

[0057] Example 3

[0058] like Figures 1-4 As shown, this application provides a liquid level warning device, including a rotating rod 3 and a warning circuit. A float 31 is provided at the first end of the rotating rod 3, and the second end of the rotating rod 3 abuts against a metal pressure plate 21. A fixing point is provided between the first and second ends of the rotating rod 3. The rotating rod 3 is fixed in the container to be tested through the fixing point. The float 31 is used to be placed on the liquid surface of the container to be tested. The buoyancy of the float 31 due to different liquid levels in the container causes the rotating rod 3 to rotate around the fixing point.

[0059] The warning circuit includes a warning switch 20, which includes a metal pressure plate 21 and a contact 22. The second end of the rotating rod 3 drives the metal pressure plate 21 to abut or disconnect from the contact 22.

[0060] The warning circuit of this application is located inside the electrical box 2, which is situated at the end of the rotating rod 3 furthest from the liquid surface of the container to be tested, i.e., directly above the rotating rod 3. The contact 22 is fixed inside the electrical box 2, and one end of the metal pressure plate 21 is fixed inside the electrical box 2. The other end of the metal pressure plate 21 slides against the second end of the rotating rod 3. This sliding contact means that the metal pressure plate 21 and the rotating rod 3 are not fixed together, but are driven by the buoyancy of the float 31 and the gravity of the rotating rod 3, ensuring that the rotating rod 3 remains in contact with the metal pressure plate 21. If they separate, the position of the metal pressure plate 21 will not reflect the position of the rotating rod 3, and the liquid level warning device will fail.

[0061] In this application, the electrical box 2 is a container for housing the warning circuit. The electrical box 2 is fixed to the side of the rotating rod 3 away from the liquid surface to prevent liquid from entering the electrical box 2. The contact 22 inside the electrical box 2 is a fixed point. One end of the metal pressure plate 21 is fixed inside the electrical box 2, and the other end of the metal pressure plate 21 slides against the second end of the rotating rod 3. The projection of the metal pressure plate 21 on a first plane inside the electrical box 2 covers the contact 22. The first plane refers to the plane in the electrical box 2 that is parallel to the liquid surface of the container to be tested. In other words, the projection of the metal pressure plate 21 in the first plane can completely cover the contact 22. At the same time, the metal pressure plate 21 is a raised sheet structure relative to the contact 22. The end of the metal pressure plate 21 without a fixed end is slidably connected to the rotating rod 3. When the rotating rod 3 rotates, the position of the metal pressure plate 21 does not change. However, the rotation of the rotating rod 3 causes the contact position between the rotating rod 3 and the metal pressure plate 21 to change, and at the same time causes the height of the metal pressure plate 21 in the vertical direction to change. When the metal pressure plate 21 moves closer to the contact 22 under the action of the rotating rod 3 until it comes into contact with the contact 22, the warning circuit is closed. When the metal pressure plate 21 moves away from the contact 22 under the action of the rotating rod 3 until it separates from the contact 22, the warning circuit is disconnected.

[0062] By using the contact 22 pressing plate and the position setting of the contact 22, this application can ensure that the warning switch 20 is adjacent to the rotating rod 3, thereby ensuring that the liquid level warning device has the smallest size, making it suitable for installation in narrow spaces.

[0063] Example 4

[0064] like Figures 1-4 As shown, the liquid level warning device provided in this application includes a rotating rod 3 and a warning circuit. The warning circuit includes a warning switch 20, which includes a metal pressure plate 21 and a contact 22. The second end of the rotating rod 3 drives the metal pressure plate 21 to abut or disconnect from the contact 22.

[0065] The rotating rod 3 has a float 31 at its first end and a metal pressure plate 21 at its second end. A fixed point is provided between the first and second ends of the rotating rod 3. The rotating rod 3 is fixed in the container to be tested through the fixed point. The float 31 is used to be placed on the liquid surface of the container to be tested. The buoyancy of the float 31 on the different liquid levels in the container to be tested causes the rotating rod 3 to rotate around the fixed point.

[0066] This application requires ensuring that the rotating rod 3 remains in contact with the metal pressure plate 21 at all times, preventing them from separating. If they separate, the position of the metal pressure plate 21 will not reflect the position of the rotating rod 3, rendering the liquid level warning device ineffective. Simultaneously, during rotation, the rotating rod 3 is driven by the buoyancy of the float 31, and the direction of this buoyancy is directly related to the liquid level. To ensure that the second end of the rotating rod 3 remains in contact with the metal pressure plate 21, a limiting component is needed to limit the rotation angle of the rotating rod 3, ensuring that it rotates within a certain range. When this range is exceeded, liquid level monitoring fails; monitoring is only effective within this range. This structure is suitable for installation in applications where only the warning liquid level is monitored, such as in an air conditioning drip tray, where a warning is issued when the liquid level in the drip tray exceeds a preset range.

[0067] Specifically, the limiting member is located on the outside of the rotating rod 3, and is used to ensure that the second end of the rotating rod 3 always abuts against the metal pressure plate 21. The limiting space of the limiting member needs to be set according to the abutment between the metal pressure plate 21 and the second end of the rotating rod 3. If the area of ​​the metal pressure plate 21 is large, the rotating rod 3 can abut against the metal pressure plate 21 within a large range during rotation, and the limiting space of the limiting member on the rotating rod 3 is relatively large. Conversely, if the area of ​​the metal pressure plate 21 is small, the limiting space of the limiting member on the rotating rod 3 is relatively small.

[0068] In this application, the limiting element can be disposed on the rotating rod 3 or disposed in the metal pressure plate 21. As a specific embodiment, the limiting element can be two protruding structures located on the side of the metal pressure plate 21 near the rotating rod 3, with the second end of the rotating rod 3 located between the two protruding structures. The rotating rod 3 can only rotate between the two protruding structures and cannot rotate beyond the protruding structures. This restricts the rotation of the rotating rod 3 within a certain range, ensuring that the metal pressure plate 21 always abuts against the second end of the rotating rod 3.

[0069] In another specific embodiment, the limiting component is a limiting through hole 161, through which the rotating rod 3 passes, and the limiting through hole 161 is located on the side of the fixing point closer to the buoy 31. Since the rotating rod 3 is located inside the limiting through hole 161, when the rotating rod 3 rotates to the edge of the limiting through hole 161, it will be subjected to the force of the limiting through hole 161, preventing the rotating rod 3 from rotating further. This restricts the rotation of the rotating rod 3 to a certain range, ensuring that the metal pressure plate 21 always abuts against the second end of the rotating rod 3.

[0070] Preferably, this application may include a housing to protect the second end of the rotating rod 3. The second end of the rotating rod 3 is away from the liquid surface and needs to be adjacent to the warning switch 20. To ensure that the warning switch 20 is not disturbed by liquid, a housing can be provided to protect it. Specifically, the housing includes a mounting base plate 16 and at least one mounting side plate. The mounting base plate 16 and the mounting side plate form a mounting chamber. The second end and fixing point of the rotating rod 3 are located inside the mounting chamber, and the float 31 is located outside the mounting chamber. A limit hole 161 is provided in the mounting base plate 16.

[0071] This application utilizes the mounting base plate 16 to form a limiting through hole 161, which can both limit the rotation range of the rotating rod 3 and provide sealing protection for the warning switch 20 and the second end of the rotating rod 3. The mounting base plate 16 and the mounting side plate can be sealed with sealant to achieve sealing protection.

[0072] As a specific embodiment, the mounting side plate in this application includes a first mounting plate 11, a second mounting plate 12, a third mounting plate 13, a fourth mounting plate 14, and a fifth mounting plate 15. The fifth mounting plate 15 is located directly above the mounting base plate 16. The first mounting plate 11, second mounting plate 12, third mounting plate 13, and fourth mounting plate 14 are sequentially arranged between the fifth mounting plate 15 and the mounting base plate 16, collectively forming a mounting chamber. The first mounting plate 11 has a larger area and is provided with mounting holes 111, which can be threaded holes through which screws pass to fix the housing in the container to be tested. The mounting base plate 16 is provided with a limiting through hole 161 through which the rotating rod 3 passes. The first end of the rotating rod 3 is located outside the mounting chamber and has a float 31, while the second end of the rotating rod 3 is located inside the mounting chamber and abuts against the metal pressure plate 21. The electrical box 2 is mounted on the top of the fifth mounting plate 15.

[0073] This application enables the installation of the liquid level warning device using the housing, while also providing sealing protection for the second end of the rotating rod 3 and the metal pressure plate 21. The limiting through hole 161 on the mounting base plate 16 also limits the rotation rod 3, ensuring that the rotating rod 3 always abuts against the metal pressure plate 21.

[0074] Example 5

[0075] like Figures 1-4As shown, this application provides a liquid level warning device, including a housing, a rotating rod 3, and an electrical box 2. The housing includes a mounting base plate 16 and five mounting side plates, including a first mounting plate 11, a second mounting plate 12, a third mounting plate 13, a fourth mounting plate 14, and a fifth mounting plate 15. The fifth mounting plate 15 is located directly above the mounting base plate 16. The first mounting plate 11, second mounting plate 12, third mounting plate 13, and fourth mounting plate 14 are sequentially arranged between the fifth mounting plate 15 and the mounting base plate 16, together forming a mounting chamber. The first mounting plate 11 has a larger area and is provided with mounting holes 111. The mounting holes 111 can be threaded holes, through which screws pass to fix the housing in the container to be tested. The electrical box 2 is located on the outer side of the fifth mounting plate 15.

[0076] Electrical box 2 is equipped with a warning circuit, such as Figure 7 As shown, the warning circuit includes a power supply 25, a warning resistor 24, a warning light 23, and a warning switch 20. When the warning switch 20 is open, the warning light 23 and the warning resistor 24 are connected in series across the power supply 25, and the warning light 23 illuminates. When the warning switch 20 is closed, the warning light 23 is short-circuited, and the warning light 23 goes out.

[0077] The warning switch 20 includes a metal pressure plate 21 and a contact 22. The contact 22 is fixed inside the electrical box 2. The metal pressure plate 21 is located inside the mounting chamber, with one end fixed inside the electrical box 2 and the other end slidingly abutting against the second end of the rotating rod 3. The projection of the metal pressure plate 21 onto a first plane inside the electrical box 2 covers the contact 22. The first plane refers to a plane in the electrical box 2 parallel to the liquid surface of the container to be tested. When the metal pressure plate 21 abuts against the contact 22, the warning switch 20 is closed. When the metal pressure plate 21 separates from the contact 22, the warning switch 20 is open.

[0078] The first end of the rotating rod 3 in this application is provided with a float 31, and the second end of the rotating rod 3 abuts against the metal pressure plate 21. A fixing point is provided between the first end and the second end of the rotating rod 3. The rotating rod 3 is hinged to a rotating shaft 32 at the fixing point. The rotating shaft 32 is fixed inside the mounting chamber and is set perpendicular to the rotating rod 3. The float 31 is located outside the mounting chamber and is used to be placed on the liquid surface of the container to be tested.

[0079] The fixed point is not located at the center of gravity of the rotating rod 3, and the fixed point is located on the side of the center of gravity of the rotating rod 3 that is far away from the buoy 31, that is, the fixed point is located at a position slightly above the center of gravity of the rotating shaft.

[0080] like Figure 5As shown, when the liquid level in the container is low, the float 31 is at a low position, and the force F provided by the rotating shaft 32 to the rotating rod 3 through the fixed point is... 轴 The limiting through hole 161 in the mounting base plate 16 provides a support force F for the rotating rod 3. 支 The force of gravity acting on the rotating rod 3 is G. Of the forces acting on it, gravity G is the largest. Under the influence of gravity, the rotating rod 3 rotates to the left side of the limiting through hole 161. At this point, the second end of the rotating rod 3 exerts an upward pushing force on the metal pressure plate 21, causing the metal pressure plate 21 to abut against the contact point 22. The supporting force generated by the metal pressure plate 21 and contact point 22 on the rotating rod 3 is F. 金属 The supporting force F on the left side of the limiting through hole 161 on the rotating rod 3 支 The supporting force F generated by the metal pressure plate 21 on the rotating rod 3 金属 When the rotating rod 3 is restricted from rotating, the warning switch 20 is closed, and the warning light 23 is short-circuited and turned off. This can be interpreted as the liquid level in the container being tested being low, and the liquid level warning device being in its initial state.

[0081] like Figure 6 As shown, as the liquid level inside the container to be tested gradually rises, the position of the float 31 also rises. When the liquid level rises to the preset height, the supporting force F of the float 31 on the rotating rod 3... 浮 Under the influence of buoyancy, the rotating rod 3 rotates counterclockwise around the pivot 32 at the fixed point, and rotates to the right side of the limiting through hole 161. At this time, the force F provided by the pivot 32 through the fixed point to the rotating rod 3 is... 轴 The limiting through hole 161 in the mounting base plate 16 provides a support force F for the rotating rod 3. 支 The force of gravity acting on the rotating rod 3 is G. At this time, the metal pressure plate 21 at the upper end of the rotating rod 3 is not under pressure. Due to its own weight, the metal pressure plate 21 shifts downward and disconnects from the contact 22. At this time, the warning switch 20 is turned off, and the warning resistor 24 and the warning light 23 are connected in series on both sides of the power supply 25 to remind that the liquid level has reached the preset height.

[0082] When the liquid level drops again, the rotating rod 3 returns to its initial state under the action of gravity.

[0083] This application features a limiting through-hole 161, which effectively restricts the movement range of the rotating rod 3, ensuring that the rod can contact the metal pressure plate 21 within the rotation range, preventing malfunctions caused by separation. The liquid level warning device of this application has a simple structure, is easy to install, and occupies little space, making it suitable for installation in confined spaces. Simultaneously, the pressure plate-type mechanical switch ensures electrical safety, and the outlet of the electrical box 2 can be sealed with sealant to prevent moisture ingress.

[0084] Example 6

[0085] This application also provides a water receiving tray that includes the above-mentioned liquid level warning device. In this application, the liquid level warning device can be installed in a water receiving tray with limited space to warn of the water level in the water receiving tray and prevent liquid overflow caused by blockage of the drain outlet of the water receiving tray.

[0086] Overall, the equipment in this application has a simple structure, is easy to install, occupies a small space, and meets the installation requirements of cabinet air conditioners. At the same time, the pressure plate mechanical structure of the switch ensures electrical safety, and the outlet of the electrical box 2 above can be blocked with sealant to prevent water vapor from entering. The structure meets the requirements of lean production design and solves the functional requirements of water level blockage warning.

[0087] Example 7

[0088] This application also provides an air conditioner including the above-mentioned water tray. When the liquid level in the water tray is too high, the warning circuit will issue a warning and conduct a fault check on the water tray to avoid liquid overflow from the water tray causing air conditioner electrical failure, thereby improving the service life and operational stability of the air conditioner.

[0089] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings. In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0090] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0091] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, these terms have no special meaning and therefore should not be construed as limiting the scope of protection of this application. The above description is only a preferred embodiment of this utility model and is not intended to limit this utility model. For those skilled in the art, this utility model can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A liquid level alarm, characterized by, include: A rotating rod (3) is provided with a float (31) at its first end and a metal pressure plate (21) at its second end. A fixed point is provided between the first and second ends of the rotating rod (3). The rotating rod (3) is fixed in the container to be tested through the fixed point. The float (31) is used to be placed on the liquid surface of the container to be tested. The buoyancy of the float (31) on the different liquid levels in the container to be tested causes the rotating rod (3) to rotate around the fixed point. The warning circuit includes a warning switch (20), which includes the metal pressure plate (21) and a contact (22). The second end of the rotating rod (3) drives the metal pressure plate (21) to abut or disconnect from the contact (22).

2. A liquid level alarm according to claim 1, wherein The fixed point is located above the liquid surface of the container to be tested, and the fixed point does not coincide with the center of gravity of the rotating rod (3).

3. A liquid level alarm according to claim 2, wherein The fixed point is located on the side of the rotating rod (3) away from the center of gravity of the buoy (31).

4. The liquid level alarm of claim 1, wherein It also includes an electrical box (2), the warning circuit is located inside the electrical box (2), the electrical box (2) is located at the end of the rotating rod (3) away from the liquid surface of the container to be tested, the contact (22) is fixed inside the electrical box (2), one end of the metal pressure plate (21) is fixed inside the electrical box (2), and the other end of the metal pressure plate (21) slides against the second end of the rotating rod (3).

5. A liquid level alarm according to claim 4, wherein The projection of the metal pressure plate (21) onto the first plane inside the electrical box (2) covers the contact point (22), where the first plane refers to the plane in the electrical box (2) that is parallel to the liquid surface of the container to be tested.

6. The liquid level alarm of claim 1, wherein It also includes a limiting member located outside the rotating rod (3) to limit the second end of the rotating rod (3) to always abut against the metal pressure plate (21).

7. A liquid level alarm according to claim 6, wherein The limiting component is a limiting through hole (161), the rotating rod (3) passes through the limiting through hole (161), and the limiting through hole (161) is located on the side of the fixing point near the buoy (31).

8. A liquid level alarm according to claim 7, wherein It also includes a housing, which includes a mounting base plate (16) and at least one mounting side plate. The mounting base plate (16) and the mounting side plate form a mounting chamber. The second end and the fixing point of the rotating rod (3) are located inside the mounting chamber. The buoy (31) is located outside the mounting chamber. The mounting base plate (16) is provided with the limiting through hole (161).

9. A water receptacle, characterized in that Includes a liquid level warning device as described in any one of claims 1-8.

10. An air conditioner characterized by comprising: Includes the water receiving tray as described in claim 9.

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