Anti-overflow liquid level switch
By utilizing the principle of photoelectric reflection intensity and glass optical path probe, combined with infrared transmitter and receiver, the problem that traditional liquid level switches cannot effectively distinguish the liquid overflow state, and the accurate detection of colorless liquid overflow is achieved, and the safety and stability of the production process are improved.
Patent Information
- Application Number
- CN202421247939.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-03
- Publication Date
- 2025-02-28
- Estimated Expiration
- 2034-06-03
AI Technical Summary
Traditional liquid level switches cannot effectively distinguish the liquid overflow state, there is a risk of equipment failure or production accidents, and may be damaged or contaminated when exposed to liquid, which is relatively expensive to maintain.
The principle of photoelectric reflection intensity is adopted to determine whether the liquid is overflowing through the glass optical path probe and the photoelectric processing circuit. The infrared emitter and infrared receiver are used to emit and receive invisible infrared light, and an accurate electrical signal is output through the photoelectric processing circuit.
It realizes accurate judgment of colorless liquid overflow, improves detection accuracy and sensitivity, reduces equipment failure and maintenance costs, and ensures safety and stability of the production process.
Smart Images
Figure CN222544782U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of liquid level detection, in particular to an anti-overflow liquid level switch. Background Art
[0002] In the fields of industrial production, home environment and laboratory, accurate detection and control of liquids are very important. Liquid level detection is a key technology used to monitor the height or position of liquids in containers or pipes. Traditional liquid level detection methods usually include float level switches, capacitive level switches, and suspended level switches. However, these traditional liquid level switches often cannot effectively distinguish whether the liquid has overflowed, which may cause equipment failure or production accidents. There may also be problems of damage or contamination when in contact with liquids, and the maintenance cost is also high.
[0003] Therefore, there is an urgent need for a new type of liquid level switch that can accurately and reliably detect the overflow state of colorless liquid to ensure the safety and stability of the production process. Utility Model Content
[0004] In view of this, the purpose of the utility model is to propose an anti-overflow liquid level switch, which aims to solve the problem that traditional liquid level switches cannot effectively distinguish the liquid overflow state. The principle of photoelectric reflection intensity is used to determine whether the liquid has overflowed, and the photoelectric reflection signal is converted into an accurate output signal through precise circuit processing technology.
[0005] Based on the above purpose, the utility model provides an anti-overflow liquid level switch, including a glass optical path probe, a photoelectric processing circuit and a connecting cable; the glass optical path probe is a glass probe that induces refraction and reflection of the light path, the photoelectric processing circuit is provided with a photoelectric sensor, the photoelectric sensor is connected to the connecting cable through the photoelectric processing circuit, the glass optical path probe is fixed to the front end of the probe sheath body through the probe sheath seat, and the photoelectric sensor is placed in the glass probe and encapsulated inside the probe sheath body.
[0006] As a further solution of the utility model, the glass optical path probe is a conical transparent glass lens.
[0007] As a further solution of the utility model, a threaded interface connected to the probe sheath seat is provided at the front end of the probe sheath body, and an O-ring is provided at the connection between the probe sheath body and the probe sheath seat.
[0008] As a further solution of the utility model, the photoelectric sensor consists of a photoelectric processing circuit board and an infrared transmitter and an infrared receiver installed on both sides of the front end of the photoelectric processing circuit board. The infrared transmitter is used to emit invisible infrared light, and the infrared receiver receives reflected infrared light. The infrared transmitter and infrared receiver are connected to the photoelectric processing circuit board, and the photoelectric processing circuit board is used to output a set of electrical signals.
[0009] As a further solution of the utility model, the photoelectric processing circuit board of the photoelectric sensor is fixed in a photoelectric sensor fixing sleeve, the photoelectric sensor fixing sleeve is located in the probe sheath body, and a rubber seal is provided inside the probe sheath body.
[0010] As a further solution of the utility model, the photoelectric processing circuit board is connected to a connecting cable, and the connecting cable passes through the rubber seal and then comes out from the rear end of the probe sheath body.
[0011] As a further solution of the utility model, the outside of the probe sheath body is provided with knurling.
[0012] As a further solution of the utility model, when the glass optical path probe is not immersed in colorless liquid, the infrared light emitted by the infrared transmitter will be reflected onto the infrared receiver and generate a group of electrical signals in the photoelectric processing circuit to make the circuit output state I; when the glass optical path probe is immersed in colorless liquid, the infrared light emitted by the infrared transmitter is partially reflected on the contact surface between the optical path probe and the liquid and then reflected onto the infrared receiver and generate a group of electrical signals in the photoelectric processing circuit to make the circuit output state II; according to the "high" level and "low" level of the circuit output state I and the circuit output state II, it is judged whether the colorless liquid immerses the optical path probe and performs liquid level detection.
[0013] Compared with the prior art, the anti-overflow liquid level switch proposed by the utility model has the following beneficial effects:
[0014] 1. High accuracy: The anti-overflow liquid level switch of the utility model utilizes the principle of photoelectric reflection intensity to accurately determine whether the colorless liquid overflows, thus avoiding the inaccuracy of the traditional liquid level switch in this regard.
[0015] 2. High sensitivity: Through the photoelectric processing circuit, the anti-overflow level switch of the utility model can sensitively detect tiny light reflection signals to ensure timely detection of colorless liquid overflow. The tapered transparent glass probe structure can stably induce refraction and reflection of the light path, so that the performance of the light path probe remains consistent in different working environments.
[0016] 3. Strong reliability: After specific voltage comparison processing and transistor drive technology, the anti-overflow level switch of the utility model can stably output two states of "high" level and "low" level, thereby ensuring the reliability and stability of the signal. Moreover, it consists of three parts: glass optical path probe, photoelectric processing circuit and connecting cable, with a simple structure, easy to manufacture and install, reducing production and maintenance costs.
[0017] To sum up, the anti-overflow liquid level switch of the utility model has the beneficial effects of high accuracy, high sensitivity, good stability, strong reliability, simple structure and wide application. It can effectively meet the needs of liquid level monitoring in industrial production and laboratories, and provide users with a reliable liquid level detection solution.
[0018] These and other aspects of the present application will be more concise and understandable in the following description of the embodiments. It should be understood that the above general description and the following detailed description are only exemplary and explanatory and cannot limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model. For ordinary technicians in this field, other embodiments can be obtained based on these drawings without paying creative work.
[0020] In the figure:
[0021] Figure 1 It is a structural schematic diagram of the anti-overflow liquid level switch of the utility model.
[0022] Figure 2 It is the front view of the anti-overflow liquid level switch of the utility model.
[0023] Figure 3 The anti-overflow liquid level switch of the utility model corresponds to Figure 2 AA section view in.
[0024] Figure 4 It is a structural schematic diagram of the photoelectric sensor in the anti-overflow liquid level switch of the utility model.
[0025] Figure 5 It is a side schematic diagram of the photoelectric sensor in the anti-overflow liquid level switch of the utility model.
[0026] Figure 6 The utility model is a schematic diagram of the structure of the probe sheath body in the anti-overflow liquid level switch.
[0027] Figure 7The utility model is a schematic diagram of the interior of the probe sheath body in the anti-overflow liquid level switch.
[0028] Figure 8 It is a schematic diagram of the glass optical path probe of the anti-overflow liquid level switch of the utility model not immersed in colorless liquid.
[0029] Fig. 9 It is a schematic diagram of the glass optical path probe of the anti-overflow liquid level switch of the utility model immersed in colorless liquid.
[0030] Fig.10 The utility model is a circuit diagram of a photoelectric processing circuit in an anti-overflow liquid level switch.
[0031] Description of reference numerals in the figures:
[0032] 1-glass lens, 2-photoelectric sensor fixing sleeve, 3-probe sheath seat, 4-probe sheath body, 41-knurling, 5-photoelectric sensor, 51-photoelectric processing circuit board, 52-infrared transmitter, 53-infrared receiver, 6-sealing ring, 7-rubber sealing, 8-connecting cable. DETAILED DESCRIPTION
[0033] Below, the present application is further described in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment.
[0034] In order to make the purpose, technical solution and advantages of the utility model more clear, the following is a further detailed description of the utility model embodiments in combination with specific embodiments and with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.
[0035] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are intended to distinguish two non-identical entities or non-identical parameters with the same name. It can be seen that "first" and "second" are only for the convenience of expression and should not be understood as limitations on the embodiments of the present invention. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, other steps or units inherent to a process, method, device, product or equipment that includes a series of steps or units.
[0036] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.
[0037] The flowcharts shown in the accompanying drawings are only examples and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps may also be decomposed, combined or partially merged, so the actual execution order may change according to actual conditions.
[0038] In conjunction with the accompanying drawings, some embodiments of the present application are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.
[0039] See also Figures 1 to 7 As shown, the embodiment of the utility model provides an anti-overflow liquid level switch, including a glass optical path probe, a photoelectric processing circuit and a connecting cable 8. Among them, the glass optical path probe is a glass probe that causes refraction and reflection of the optical path, see Figure 1 and Figure 3 As shown, the glass optical path probe is a conical transparent glass lens 1. The photoelectric processing circuit is provided with a photoelectric sensor 5, and the photoelectric sensor 5 is connected to the connecting cable 8 through the photoelectric processing circuit. The glass optical path probe is fixed to the front end of the probe sheath body 4 through the probe sheath seat 3, and the photoelectric sensor 5 is placed in the glass probe and encapsulated inside the probe sheath body 4.
[0040] A threaded interface connected to the probe sheath seat 3 is provided at the front end of the probe sheath body 4 , and an O-ring 6 is provided at the connection between the probe sheath body 4 and the probe sheath seat 3 .
[0041] See also Figure 3 , Figure 4 and Figure 5 As shown, the photoelectric sensor 5 is composed of a photoelectric processing circuit board 51 and an infrared transmitter 52 and an infrared receiver 53 installed on both sides of the front end of the photoelectric processing circuit board 51. The infrared transmitter 52 is used to emit invisible infrared light, and the infrared receiver 53 receives the reflected infrared light. The infrared transmitter 52 and the infrared receiver 53 are connected to the photoelectric processing circuit board 51, and the photoelectric processing circuit board 51 is used to output a set of electrical signals.
[0042] In this embodiment, the photoelectric processing circuit board 51 of the photoelectric sensor 5 is fixed in the photoelectric sensor fixing sleeve 2, and the photoelectric sensor fixing sleeve 2 is located in the probe sheath body 4. The probe sheath body 4 is provided with a rubber plug 7. The photoelectric processing circuit board 51 is connected to the connecting cable 8, and the connecting cable 8 passes through the rubber plug 7 and then passes out from the tail of the probe sheath body 4. In this embodiment, the probe sheath body 4 is provided with a knurling 41 on the outside.
[0043] In the anti-overflow level switch of the utility model, the optical path probe is a conical transparent glass probe, which is used to induce refraction and reflection of the optical path. The photoelectric processing circuit part is used to emit invisible infrared light, receive the reflected infrared light, and process it by circuit, so as to finally output a set of electrical signals. When the anti-overflow level switch is used for liquid level detection, the immersion state of the glass optical path probe in the colorless liquid is distinguished by the photoelectric reflection intensity.
[0044] In this embodiment, see Figure 8 As shown, when the glass optical path probe is not immersed in colorless liquid, the infrared light emitted by the infrared transmitter 52 will be reflected by the infrared receiver 53 and generate a set of electrical signals in the photoelectric processing circuit to make the circuit output state I. Fig. 9 As shown, when the glass optical path probe is immersed in colorless liquid, the infrared light emitted by the infrared transmitter 52 is partially reflected at the contact surface between the optical path probe and the liquid, and only a small reflection is generated. Most of the infrared light beams will directly penetrate the contact surface and then be directly emitted by the infrared receiver 53, and a group of electrical signals will be generated in the photoelectric processing circuit to make the circuit output state II; according to the circuit output state I and the circuit output state II, through the preset voltage comparison processing and transistor driving, the final output signal shows two states of "high" level and "low" level, to judge whether the colorless liquid immerses the optical path probe, and perform liquid level detection.
[0045] Among them, see Fig.10 As shown, the resistance of the PN junction contact resistance of the infrared receiver D3 will gradually decrease as the intensity of the infrared light becomes stronger. Based on this principle, the infrared receiver D3 and the resistor R14 can be used for voltage division to generate a voltage value at the 3rd pin of U3A. The generated voltage value is then amplified by the U3A positive phase proportional amplifier circuit. The amplified voltage passes through the subsequent voltage comparator circuit and finally outputs 5V or 0V at the 7th pin of U3B. The output voltage passes through R12 to drive the transistor Q2, so that the signal output pin of J2 finally presents VCC or GND.
[0046] Therefore, when the probe is not immersed in liquid, the resistance of D3 is large, so the voltage generated at pin 3 of U3A is relatively low. Conversely, when the probe is immersed in liquid, the voltage generated is relatively high. The lower voltage (unimmersed state) is lower than 3V after amplification, and will output 0V at pin 7 of U3B, and transistor Q2 is not turned on, so the external output signal is VCC; conversely, the higher voltage (immersed state) is higher than 3V after amplification, and will output 5V at pin 7 of U3B, making transistor Q2 turned on, so the external output signal is GND.
[0047] To sum up, the anti-overflow liquid level switch of the utility model has the beneficial effects of high accuracy, high sensitivity, good stability, strong reliability, simple structure and wide application. It can effectively meet the needs of liquid level monitoring in industrial production and laboratories, and provide users with a reliable liquid level detection solution.
[0048] It should be understood that, as used herein, the singular form "a" or "an" is intended to include the plural form, unless the context clearly supports an exception. It should also be understood that, as used herein, "and / or" refers to any and all possible combinations of one or more of the items listed in association. The serial numbers of the embodiments disclosed in the above-mentioned embodiments of the utility model are only for description and do not represent the advantages and disadvantages of the embodiments.
[0049] Those skilled in the art should understand that the discussion of any of the above embodiments is only exemplary and is not intended to imply that the scope of the disclosure of the embodiments of the present invention (including the claims) is limited to these examples; under the concept of the embodiments of the present invention, the technical features in the above embodiments or different embodiments can also be combined, and there are many other changes in different aspects of the above embodiments of the present invention, which are not provided in detail for the sake of simplicity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present invention should be included in the protection scope of the embodiments of the present invention.
Claims
1. An anti-overflow level switch, characterized in that: The invention comprises a glass optical path probe, a photoelectric processing circuit and a connecting cable (8); the glass optical path probe is a glass probe that triggers refraction and reflection of the optical path; the photoelectric processing circuit is provided with a photoelectric sensor (5); the photoelectric sensor (5) is connected to the connecting cable (8) via the photoelectric processing circuit; the glass optical path probe is fixed to the front end of a probe sheath body (4) via a probe sheath seat (3); the photoelectric sensor (5) is placed in the glass probe and encapsulated in the probe sheath body (4).
2. The anti-overflow liquid level switch according to claim 1, characterized in that: The glass optical path probe is a conical transparent glass lens (1).
3. The anti-overflow liquid level switch according to claim 2, characterized in that: The front end of the probe sheath body (4) is provided with a threaded interface connected to the probe sheath seat (3), and an O-type sealing ring (6) is provided at the connection between the probe sheath body (4) and the probe sheath seat (3).
4. The anti-overflow liquid level switch according to claim 3, characterized in that: The photoelectric sensor (5) is composed of a photoelectric processing circuit board (51) and an infrared transmitter (52) and an infrared receiver (53) installed on both sides of the front end of the photoelectric processing circuit board (51); the infrared transmitter (52) is used to emit invisible infrared light, and the infrared receiver (53) receives the reflected infrared light. The infrared transmitter (52) and the infrared receiver (53) are connected to the photoelectric processing circuit board (51); and the photoelectric processing circuit board (51) is used to output a set of electrical signals.
5. The anti-overflow liquid level switch according to claim 4, characterized in that: The photoelectric processing circuit board (51) of the photoelectric sensor (5) is fixed in the photoelectric sensor fixing sleeve (2), the photoelectric sensor fixing sleeve (2) is located in the probe sheath body (4), and a rubber seal (7) is provided inside the probe sheath body (4).
6. The anti-overflow liquid level switch according to claim 5, characterized in that: The photoelectric processing circuit board (51) is connected to a connecting cable (8), and the connecting cable (8) passes through the rubber seal (7) and then exits from the rear end of the probe sheath body (4).
7. The anti-overflow liquid level switch according to claim 6, characterized in that: The probe sheath body (4) is provided with knurling (41) on the outside.