Liquid level switch capable of inhibiting attachment of grease scale
By designing a level switch using foam plastic float ball and Hall components, the existing level switch is easily malfunctioning in harsh environments of the dishwasher, achieving higher durability and service life.
Patent Information
- Application Number
- CN202421860545.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-02
- Publication Date
- 2025-05-13
- Estimated Expiration
- 2034-08-02
AI Technical Summary
Existing liquid level switches are prone to failure in harsh environments of the dishwasher, including water leakage, oil-stained floating balls and reed tube ruptures.
A liquid level switch including a fixing rod, a PCB plate, a hall element, a limiting assembly and a float ball were designed. The float is made of foam plastic material, which has the advantages of high buoyancy and high temperature resistance, and avoids oil stains stuck. Hall elements conduct or close the circuit through a magnetic field to avoid burning out the mechanical contacts.
This level switch can effectively deal with oil and scale in the dishwasher, extends service life, and improves tolerance to harsh environments.
Smart Images
Figure CN222867540U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of liquid level switches, in particular to a liquid level switch capable of inhibiting the adhesion of grease and scale. Background Art
[0002] Among the internal parts of commercial dishwashers, the liquid level switch is very prone to failure. All types of liquid level switches on the market are prone to failure. The core reason lies in the water tank environment. The water in the main wash tank is recycled water, accompanied by high temperature, detergent corrosion, and oil pollution. Ordinary float level switches cannot cope with such harsh conditions. The traditional float level switch uses a float and a reed switch in conjunction with each other. The float is made of two hemispheres of stainless steel laser welded, which is expensive and prone to water leakage. It is also difficult to detect when leaking. The float will be contaminated with oil during cleaning, and the oil will jam the float. The reed switch is easy to break and the contacts are easy to burn out. Utility Model Content
[0003] The utility model aims to provide a liquid level switch capable of inhibiting the adhesion of grease and scale, so as to solve the problems raised in the above-mentioned background technology.
[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a liquid level switch capable of inhibiting the adhesion of grease and scale, comprising a fixed rod, the interior of the fixed rod being hollow, a PCB board being inserted into the interior of the fixed rod, the side ends of the PCB board being respectively provided with a first Hall element and a second Hall element, the lower end of the PCB board being connected to a connecting cable, a first limit assembly and a second limit assembly being fixedly connected to the outer wall of the fixed rod, a first float and a second float being slidingly connected to the middle of the fixed rod, a fixed cylinder being fixedly connected to the lower end of the fixed rod, the inner and outer walls of the fixed cylinder being provided with threads, a mounting head being threadedly connected to the inner wall of the fixed cylinder, and both ends of the connecting cable passing through the mounting head.
[0005] Preferably, the first limiting assembly is composed of two limiting plates, each of which is an arc-shaped structure; the second limiting assembly is composed of a limiting plate and a blocking platform, each of which is located at the side end of the fixed rod; the first floating ball is located in the middle of the first limiting assembly, and the second floating ball is located in the middle of the second limiting assembly.
[0006] Preferably, the limiting plate is an elastic structure, a clamping joint is fixedly connected to the inner wall of the limiting plate, and the top end of the clamping joint abuts against the side wall of the fixing rod.
[0007] Preferably, the first float and the second float are both annular structures, a first magnet ring is clamped in the middle of the first float, a second magnet ring is clamped in the middle of the second float, and the first magnet ring is embedded in the middle of the foamed first float while the first float is being foamed and injection molded.
[0008] Preferably, the first Hall element is located in the middle of the first limiting assembly, and the second Hall element is located in the middle of the second limiting assembly.
[0009] Preferably, the fixing rod is a nylon rod, and the first float and the second float are foamed plastics.
[0010] Preferably, an adhesive tape is wound between the connecting cable and the PCB board, and the upper end of the mounting head abuts against the lower end of the PCB board.
[0011] Compared with the prior art, the utility model has the following beneficial effects: the float is made of foamed plastic, which has a large volume, large buoyancy and gravity, and can effectively deal with the common problem of oil stains getting stuck in the dishwasher. At the same time, it is not easy for scale to adhere to plastic products compared to metal floats; the float drives the strong magnet to move together when it moves, and the Hall element can use the magnetic field to act on the carriers in the current-carrying metal conductor and semiconductor when it is working, to generate a lateral potential difference. When the current passes through the Hall element, the free electrons are deflected by the Lorentz force under the action of the magnetic field, resulting in the accumulation of charges on both sides of the Hall element to form a potential difference. Therefore, the first Hall element and the second Hall element can turn on or off the circuit according to the strength of the magnetic field. The Hall element has no mechanical contacts when it is working, which greatly improves its service life. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 This is a schematic diagram of the external connection of the liquid level switch.
[0013] Figure 2 This is a schematic diagram of the internal connections of the liquid level switch.
[0014] In the figure: 1 fixing rod, 2 fixing cylinder, 3 limiting plate, 31 first limiting assembly, 32 second limiting assembly, 4 first float, 5 mounting head, 6 second float, 7 PCB board, 8 first Hall element, 9 second Hall element, 10 first magnet ring, 101 second magnet ring, 11 card connector, 12 connecting cable, 13 tape, 14 blocking platform. DETAILED DESCRIPTION
[0015] In order to deepen the understanding and recognition of the utility model, the technical solutions in the embodiments of the utility model will be clearly and completely described and introduced in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments, and are not intended to limit the embodiments in any form. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0016] See also Figure 1-2 The utility model provides a technical solution: a liquid level switch capable of inhibiting the adhesion of grease and scale, comprising a fixing rod 1, the interior of the fixing rod 1 is hollow, a PCB board 7 is inserted into the interior of the fixing rod 1, the side ends of the PCB board 7 are respectively provided with a first Hall element 8 and a second Hall element 9, a lower end of the PCB board 7 is connected with a connecting cable 12, a first limit assembly 31 and a second limit assembly 32 are fixedly connected to the outer wall of the fixing rod 1, a first float 4 and a second float 6 are slidably connected in the middle of the fixing rod 1, a fixing cylinder 2 is fixedly connected to the lower end of the fixing rod 1, the inner and outer walls of the fixing cylinder 2 are both provided with threads, a mounting head 5 is threadedly connected to the inner wall of the fixing cylinder 2, both ends of the connecting cable 12 pass through the mounting head 5, the first float 4 and the second float 6 are both plastic products, have the advantages of large gravity and large buoyancy, can resist oil pollution, avoid the float from getting stuck, and also have the advantages of scale resistance, which greatly increases the service life.
[0017] The first limit assembly 31 is composed of two limit pieces 3, and the limit pieces 3 are of an arc-shaped structure. The second limit assembly 32 is composed of a limit piece 3 and a blocking platform 14. The blocking platform 14 is located at the side end of the fixed rod 1. The first float 4 is located in the middle of the first limit assembly 31, and the second float 6 is located in the middle of the second limit assembly 32. The limit piece 3 is an elastic structure. A clamping joint 11 is fixedly connected to the inner wall of the limit piece 3, and the top of the clamping joint 11 abuts against the side wall of the fixed rod 1. The first limit assembly 31 limits the moving distance of the first float 4, and the second limit assembly 32 limits the moving distance of the second float 6. Pulling the two ends of the limit piece 3 can deform the limit piece 3, and the limit piece can be installed at different positions of the fixed rod 1 through the clamping joint 3, thereby controlling the moving distances of the first float 4 and the second float 6.
[0018] The first float 4 and the second float 6 are both annular structures, and the first magnet ring 10 is clamped in the middle of the first float 4, and the second magnet ring 101 is clamped in the middle of the second float 6. When the first float 4 is foamed and injected, the first magnet ring 10 is embedded in the middle of the foamed first float 4, the first Hall element 8 is located in the middle of the first limit component 31, and the second Hall element 9 is located in the middle of the second limit component 32. When the first magnet ring 10 and the second magnet ring 101 move with the first float 4 and the second float 6, the first magnet ring 10 approaches or moves away from the first Hall element 8, and the second magnet ring 101 approaches or moves away from the second Hall element 9, respectively, thereby changing the magnetic field strength near the first Hall element 8 and the second Hall element 9. According to the Hall effect, the first Hall element 8 and the second Hall element 9 can open or close the circuit according to the magnetic field strength. This method does not require mechanical contacts, has a more sensitive response, and can also avoid contact burning.
[0019] The fixed rod 1 is a nylon rod, and the first float 4 and the second float 6 are foamed plastics. The fixed rod, the first float 4 and the second float 6 are all resistant to high temperatures. The first float 4 and the second float 6 can control the volume. The large volume means large buoyancy and gravity, which can effectively deal with the common problem of the float being stuck by oil stains in the dishwasher.
[0020] An adhesive tape 13 is wrapped between the connecting cable 12 and the PCB board 7. The upper end of the mounting head 5 rests against the lower end of the PCB board 7. The adhesive tape can wrap and fix the connecting cable 12. The mounting head 5 can support the PCB board 7. The mounting head 5 cooperates with the fixing tube 2 to limit and fix the PCB board 7 to prevent it from shifting.
[0021] Although the embodiments of the utility model have been shown and described, it should be emphasized that the above description is only an introduction and description of the use of the embodiments of the utility model, and does not limit the utility model in any form. For those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the utility model, and the scope of the utility model is defined by the attached claims and their equivalents.
Claims
1. A liquid level switch capable of inhibiting the adhesion of grease and scale, comprising a fixing rod (1), characterized in that: The interior of the fixing rod (1) is hollow, a PCB board (7) is inserted into the interior of the fixing rod (1), the side ends of the PCB board (7) are respectively provided with a first Hall element (8) and a second Hall element (9), the lower end of the PCB board (7) is connected to a connecting cable (12), the outer wall of the fixing rod (1) is fixedly connected to a first limit assembly (31) and a second limit assembly (32), the middle of the fixing rod (1) is slidably connected to a first float (4) and a second float (6), the lower end of the fixing rod (1) is fixedly connected to a fixing cylinder (2), the inner wall and the outer wall of the fixing cylinder (2) are both provided with threads, the inner wall of the fixing cylinder (2) is threadedly connected to a mounting head (5), and both ends of the connecting cable (12) pass through the mounting head (5).
2. A liquid level switch capable of inhibiting the adhesion of grease and scale according to claim 1, characterized in that: The first limiting assembly (31) is composed of two limiting pieces (3), the limiting pieces (3) are arc-shaped structures, the second limiting assembly (32) is composed of a limiting piece (3) and a blocking platform (14), the blocking platform (14) is located at the side end of the fixing rod (1), the first floating ball (4) is located in the middle of the first limiting assembly (31), and the second floating ball (6) is located in the middle of the second limiting assembly (32).
3. A liquid level switch capable of inhibiting the adhesion of grease and scale according to claim 2, characterized in that: The limiting plate (3) is an elastic structure, and a clamping joint (11) is fixedly connected to the inner wall of the limiting plate (3), and the top end of the clamping joint (11) abuts against the side wall of the fixing rod (1).
4. A liquid level switch capable of inhibiting the adhesion of grease and scale according to claim 1, characterized in that: The first float (4) and the second float (6) are both annular structures, a first magnet ring (10) is clamped in the middle of the first float (4), and a second magnet ring (101) is clamped in the middle of the second float (6), and the first magnet ring (10) is embedded in the middle of the foamed first float (4) while the first float (4) is being foamed and injection-molded.
5. A liquid level switch capable of inhibiting the adhesion of grease and scale according to claim 1, characterized in that: The first Hall element (8) is located in the middle of the first limit assembly (31), and the second Hall element (9) is located in the middle of the second limit assembly (32).
6. A liquid level switch capable of inhibiting the adhesion of grease and scale according to claim 1, characterized in that: The fixing rod (1) is a nylon rod, and the first floating ball (4) and the second floating ball (6) are foamed plastics.
7. A liquid level switch capable of inhibiting the adhesion of grease and scale according to claim 1, characterized in that: An adhesive tape (13) is wound between the connecting cable (12) and the PCB board (7), and the upper end of the mounting head (5) abuts against the lower end of the PCB board (7).