A non-contact liquid level detection device

Abstract

The present invention relates to a non-contact liquid level detection device, comprising a transmitting module for transmitting sensing radiation, a receiving module for receiving sensing radiation, a first reflecting portion, and a second reflecting portion. The transmitting module and the receiving module are oriented in different directions, the transmitting module corresponding to the first reflecting portion, and the receiving module corresponding to the second reflecting portion. A passing portion is provided between the transmitting module and the receiving module. The first reflecting portion and the second reflecting portion cooperate with each other. When the liquid level is below a set liquid level, the sensing radiation is reflected by the first reflecting portion, passes through the passing portion, and finally reflects by the second reflecting portion to reach the receiving module, generating an electrical signal on the receiving module. When the liquid level reaches or exceeds the set liquid level, the sensing radiation diffuses into the liquid, and no electrical signal is generated on the receiving module. This non-contact liquid level detection device has a simple and reasonable structure, reliable performance, low manufacturing cost, and high production efficiency.

Description

Technical Field

[0001] The invention relates to a liquid level detector, in particular to a non-contact liquid level detection device. Background Art

[0002] Existing non-contact water level sensors include:

[0003] Infrared water level sensor, which monitors water level based on the reception of infrared rays; when there is no water outside the reflecting surface, the infrared rays are reflected by two mutually perpendicular reflecting surfaces and finally received and generate corresponding electrical signals; when there is water outside the reflecting surface, most or all of the infrared rays are scattered into the water, and a small part or no infrared rays are received, causing the electrical signal to disappear, thereby achieving the purpose of detecting the water level; such as the water detection system and the ventilator with the system disclosed in Chinese patent document CN209204376U, which specifically discloses that "the optical liquid level sensor is electrically connected to the signal processing device, and the signal processing device is electrically connected to the controller; the optical liquid level sensor is built-in with a light beam emitting tube and a light beam receiving tube", "the liquid level detection functional component includes a first surface and a second surface at a certain angle, wherein the first surface and the second surface are made of a light-transmitting material", "the angle between the first surface and the second surface is 90°, and the size of the first surface is the same as the size of the second surface"; another example is a liquid level sensor with infrared The device for self-identifying liquid level control and ultra-low water level control specifically discloses that "the sensor hardware structure of the control device includes a sensor housing, a light-transmitting surface, an infrared emitting tube, an infrared receiving tube, and a baffle. The light-transmitting surface wraps around the liquid level detection surface of the sensor housing. The infrared emitting tube and the infrared receiving tube are respectively arranged on the left and right sides of the interior of the sensor housing. The baffle is vertically arranged between the infrared emitting tube and the infrared receiving tube." "The liquid level detection surface is a 90-degree prism structure. The infrared light emitted by the infrared emitting tube is reflected by the prism structure to the infrared receiving tube." It can be seen that existing infrared water level sensors all rely on two mutually perpendicular reflecting surfaces to reflect infrared light. In actual applications, the processing technology requirements for the reflecting surfaces are relatively high (the two reflecting surfaces must be ensured to be perpendicular to each other). The orientation of the transmitter and the receiver are consistent to ensure that the infrared light reflected by the two mutually perpendicular reflecting surfaces can be successfully received by the receiver. It can be seen that the installation position of the transmitter and receiver must be precise (the positional relationship between the reflective surfaces must be accurate). Therefore, the production and assembly are difficult and demanding. The high-precision process requirements lead to high manufacturing costs.

[0004] Capacitive water level sensors detect water levels based on capacitance changes. However, capacitance is affected by numerous factors, including water quality (which affects conductivity), scale (which affects capacitance), current, and voltage. This results in low reliability and accuracy for capacitive water level detection. Furthermore, complex and specialized debugging is required during production to tailor the water quality to specific areas, making production difficult and inefficient.

[0005] Therefore, there is a need to make further improvements to the problems existing in the existing non-contact water level sensors. Summary of the Invention

[0006] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art and to provide a non-contact liquid level detection device, which has a simple and reasonable structure, reliable performance, low manufacturing cost and high production efficiency.

[0007] The object of the present invention is achieved like this:

[0008] A non-contact liquid level detection device includes a transmitting module for transmitting sensing rays, a receiving module for receiving sensing rays, a first reflecting portion, and a second reflecting portion; the orientation of the transmitting module is inconsistent with the orientation of the receiving module, the transmitting module corresponds to the first reflecting portion, and the receiving module corresponds to the second reflecting portion; a passing portion is provided between the transmitting module and the receiving module; the first reflecting portion and the second reflecting portion cooperate with each other; when the liquid level is lower than a set liquid level, the sensing rays are reflected by the first reflecting portion, pass through the passing portion, and finally reflect by the second reflecting portion to reach the receiving module, and an electrical signal is generated on the receiving module; when the liquid level reaches or exceeds the set liquid level, the sensing rays diffuse in the liquid, and no electrical signal is generated on the receiving module.

[0009] As a specific solution, the transmitting module and the receiving module are respectively arranged between the first reflecting part and the second reflecting part; the direction of the transmitting module is opposite to the direction of the receiving module.

[0010] As another specific solution, the non-contact liquid level detection device also includes a barrier body for blocking the sensing rays, the passing portion is arranged on the barrier body, the transmitting module is arranged on one side of the barrier body, and the receiving module is arranged on the other side of the barrier body.

[0011] As another specific solution, the penetration portion is a hollow structure and / or a notch structure on the barrier body.

[0012] As another specific solution, the non-contact liquid level detection device also includes a sleeve covering the outside of the barrier body, the barrier body separates the inner cavity of the sleeve into a first accommodating chamber and a second accommodating chamber, the transmitting module is arranged in the first accommodating chamber, the receiving module is arranged in the second accommodating chamber, the crossing part is arranged between the first accommodating chamber and the second accommodating chamber, and the sensing rays in the first accommodating chamber pass through the crossing part and enter the second accommodating chamber.

[0013] As another specific scheme, the sleeve is made of a transparent material; the first reflecting part and the second reflecting part are respectively the inner side walls of the sleeve, and the first reflecting part and the second reflecting part are parallel to each other; when the liquid level reaches or exceeds the set liquid level height, the sensing ray passes through the first reflecting part and / or the second reflecting part and diffuses in the liquid; when the liquid level is lower than the set liquid level height, the sensing ray is reflected by the first reflecting part and the second reflecting part and reaches the receiving module.

[0014] As another specific solution, the transmitting module and the receiving module are arranged vertically; the transmitting module, the receiving module, the first reflecting part and the second reflecting part are respectively arranged in a liquid storage cavity for loading liquid.

[0015] As another specific solution, the sensing ray is infrared ray or laser ray.

[0016] As another specific solution, the transmitting module and the receiving module together constitute a group of detection components, and the detection components are provided in one group or more than two groups, and a barrier portion for intercepting the sensing rays is provided between two adjacent groups of detection components.

[0017] As another specific solution, two or more transmitting modules are connected in parallel with each other, and two or more receiving modules are connected in parallel with each other; the receiving modules are electrically connected to corresponding indicator lights.

[0018] The beneficial effects of the present invention are as follows:

[0019] In this device, the orientation of the transmitting module is inconsistent with that of the receiving module. The transmitting module corresponds to the first reflecting part, and the receiving module corresponds to the second reflecting part. A passing part is provided between the transmitting module and the receiving module, and the first reflecting part and the second reflecting part cooperate with each other. When the liquid level is lower than the set liquid level height, the sensing ray is reflected by the first reflecting part, passes through the passing part, and finally reaches the receiving module after being reflected by the second reflecting part, and an electrical signal is generated on the receiving module. When the liquid level reaches or exceeds the set liquid level height, the sensing ray diffuses in the liquid, and no electrical signal is generated on the receiving module. Compared with the prior art, the sensor rays in the present application are reflected between two opposite reflecting parts (the two reflecting parts do not need to be perpendicular to each other), the orientations of the transmitting module and the receiving module are inconsistent (the orientations of the transmitting module and the receiving module do not need to be consistent with each other), and the passing part between the transmitting module and the receiving module serves to limit the passage of part of the sensor rays; when the liquid level has not reached the set liquid level height, the sensor rays that have been reflected multiple times finally reach the receiving module, causing the receiving module to generate a corresponding electrical signal, and the system determines that the liquid level has not reached the set liquid level height; when the liquid level reaches or exceeds the set liquid level height, the sensor rays diffuse into the liquid, and the receiving module cannot generate a corresponding electrical signal because it does not receive the sensor rays or receives insufficient sensor rays, and the system determines that the liquid level has reached or exceeded the set liquid level height.

[0020] Specifically, the transmitting module and the receiving module are respectively installed and fixed on the barrier body, and the passing part is a hollow structure and / or a notch structure on the barrier body. In actual applications, the barrier body can be a circuit board, and the relevant circuit is printed on the circuit board, and the transmitting module and the receiving module are directly soldered to the circuit board; in addition, the outside of the barrier body is covered with a sleeve, and the two reflecting parts are the inner walls (non-specific structure or shape) of the sleeve, and the sleeve also plays a protective and water-proof role; during the overall assembly, the positional relationship between the transmitting module and the receiving module and the reflecting part has low requirements, on the one hand, it can improve assembly efficiency and production efficiency, and on the other hand, it can effectively improve the yield rate and enhance the stability and effectiveness of the device; in addition, scale is easily generated and adhered to the outer wall of the sleeve after long-term use. The scale becomes transparent when it comes into contact with the liquid, and the infrared rays can still diffuse into the liquid, so the scale has little effect on the detection performance of the device, overcoming the shortcomings of the capacitive liquid level sensor, avoiding the need for complex and professional debugging due to differences in water quality, and simplifying the production process.

[0021] It can be seen that the device has the advantages of simple and reasonable structure, reliable performance, simple processing technology, convenient installation and assembly, low manufacturing cost, and high production efficiency; the non-contact liquid level detection device can be widely used in equipment and home appliances with liquid storage functions, including water dispensers, electric kettles, coffee machines, atomizers, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 11 is an assembly diagram of the non-contact liquid level detection device in the first embodiment of the present invention.

[0023] Figure 2 This is an exploded view of the non-contact liquid level detection device in the first embodiment of the present invention.

[0024] Figure 3 2 is a cross-sectional view of a non-contact liquid level detection device according to a first embodiment of the present invention.

[0025] Figure 4 This is a partial cross-sectional schematic diagram of the non-contact liquid level detection device in the first embodiment of the present invention when not immersed in liquid.

[0026] Figure 5 It is a partial cross-sectional schematic diagram of the non-contact liquid level detection device when the liquid level does not reach the set liquid level height in the first embodiment of the present invention.

[0027] Figure 6 It is a partial cross-sectional schematic diagram of the non-contact liquid level detection device when the liquid level exceeds the set liquid level height in the first embodiment of the present invention.

[0028] Figure 7 for Figure 3 Cross-sectional view in the HH direction.

[0029] Figure 8 for Figure 7 Cross-sectional view in the KK direction.

[0030] Figure 9 FIG. 1 is a schematic circuit diagram of a non-contact liquid level detection device according to a first embodiment of the present invention.

[0031] Figure 10 It is a partial cross-sectional view of a non-contact liquid level detection device in a second embodiment of the present invention.

[0032] Figure 11 1 is an assembly diagram of a non-contact liquid level detection device in a third embodiment of the present invention.

[0033] Figure 12 1 is an exploded view of a non-contact liquid level detection device in a third embodiment of the present invention.

[0034] Figure 13 2 is a cross-sectional view of a non-contact liquid level detection device according to a third embodiment of the present invention.

[0035] Figure 14 4 is a partial cross-sectional schematic diagram of the non-contact liquid level detection device in the third embodiment of the present invention when not immersed in liquid.

[0036] Figure 15 This is a partial cross-sectional schematic diagram of the non-contact liquid level detection device when the liquid level has not reached the set liquid level height in the third embodiment of the present invention.

[0037] Figure 16 It is a partial cross-sectional schematic diagram of the non-contact liquid level detection device when the liquid level exceeds the set liquid level height in the third embodiment of the present invention.

[0038] Figure 17 FIG. 4 is a schematic circuit diagram of a non-contact liquid level detection device according to a third embodiment of the present invention. DETAILED DESCRIPTION

[0039] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0040] First embodiment

[0041] See also Figures 1-9The non-contact liquid level detection device involved in this embodiment includes a transmitting module 2 for transmitting a sensing ray a, a receiving module 4 for receiving the sensing ray a, a first reflecting portion 101, and a second reflecting portion 104. The orientation of the transmitting module 2 is inconsistent with the orientation of the receiving module 4. The transmitting module 2 corresponds to the first reflecting portion 101, and the receiving module 4 corresponds to the second reflecting portion 104. A passing portion 301 is provided between the transmitting module 2 and the receiving module 4. The first reflecting portion 101 and the second reflecting portion 104 are opposite to each other. When the liquid level Y1 is lower than the set liquid level height b, the sensing ray a is reflected by the first reflecting portion 101, passes through the passing portion 301, and finally reflects by the second reflecting portion 104 to reach the receiving module 4, and an electrical signal is generated on the receiving module 4. When the liquid level Y1 reaches or exceeds the set liquid level height b, the sensing ray a diffuses in the liquid Y (specifically, water), and no electrical signal is generated on the receiving module 4. In the non-contact liquid level detection device of this embodiment, the sensor ray a is reflected between two opposing reflective portions (the first reflective portion 101 and the second reflective portion 104) (the first reflective portion 101 and the second reflective portion 104 are not perpendicular to each other). The transmitting module 2 and the receiving module 4 are oriented in different directions, and the passing portion 301 between the transmitting module 2 and the receiving module 4 serves to limit the portion of the sensor ray a that passes through. When the liquid level Y1 does not reach the set liquid level height b, the sensor ray a, after multiple reflections, eventually reaches the receiving module 4, causing the receiving module 4 to generate a corresponding electrical signal, and the system determines that the liquid level has not reached the set liquid level height. When the liquid level Y1 reaches or exceeds the set liquid level height b, the sensor ray a diffuses into the liquid Y. The receiving module 4 does not receive the sensor ray a or receives insufficient sensor ray a, resulting in it being unable to generate a corresponding electrical signal. The system determines that the liquid level has reached or exceeded the set liquid level height. In this device, there is no rigid angle requirement between the first reflecting part 101 and the second reflecting part 104, so the structure is simple and reasonable, the production process is simplified, and the manufacturing cost is low. This device detects the water level by reflecting the sensor ray a, which is not affected by external factors such as water quality and scale. Therefore, the detection performance of the device is reliable and adaptable, and no debugging is required during production, thereby improving production efficiency.

[0042] Furthermore, the transmitting module 2 and the receiving module 4 are respectively arranged between the first reflecting portion 101 and the second reflecting portion 104. In this embodiment, the first reflecting portion 101 and the second reflecting portion 104 are parallel to each other. The sensing ray a can be reflected multiple times between the first reflecting portion 101 and the second reflecting portion 104. The direction of the reflection is changed so that several sensing rays a finally reach the receiving module 4 and are received by it; see Figure 3-6It can be seen that the orientation of the transmitting module 2 is opposite to that of the receiving module 4, that is, the transmitting end of the transmitting module 2 is toward the first reflecting part 101, and the receiving end of the receiving module 4 is toward the second reflecting part 104. The sensing ray a needs to pass through an effective reflecting surface to be reflected, and the height position of the liquid level Y1 can directly affect the effectiveness of the transmitting surface, thereby achieving the purpose of detecting the liquid level.

[0043] Furthermore, the present non-contact liquid level detection device includes a barrier body 3 for blocking sensing radiation a. A penetration portion 301 is provided on the barrier body 3. The transmitter module 2 is disposed on one side (e.g., the front side) of the barrier body 3, and the receiver module 4 is disposed on another side (e.g., the rear side) of the barrier body 3. Specifically, in practical applications, the barrier body 3 may be a circuit board (the material of the circuit board is selected to provide shielding and blocking effects on sensing radiation a). The relevant circuitry is printed on the circuit board. The transmitter module 2 and receiver module 4 are respectively secured to the circuit board by soldering. The penetration portion 301 is directly provided on the circuit board. To further enhance the shielding performance of the circuit board, a metal diaphragm for shielding / reflecting sensing radiation a may optionally be added to the circuit board. The transmitter module 2 and receiver module 4 are arranged vertically.

[0044] Further, see Figure 7 In this embodiment, the passing portion 301 is a circular hollow structure on the barrier body 3. The specific shape of the passing portion 301 is not particularly limited, that is, the shape of the passing portion 301 can be any regular shape or irregular shape.

[0045] Furthermore, the non-contact liquid level detection device also includes a sleeve 1 covered on the outside of the barrier body 3, the barrier body 3 separates the inner cavity of the sleeve 1 into a first accommodating chamber 102 and a second accommodating chamber 103, the transmitting module 2 is arranged in the first accommodating chamber 102, the receiving module 4 is arranged in the second accommodating chamber 103, the passing portion 301 is arranged between the first accommodating chamber 102 and the second accommodating chamber 103, the sensing ray a in the first accommodating chamber 102 passes through the passing portion 301 and enters the second accommodating chamber 103; the sensing ray a is reflected more than once in the first accommodating chamber 102, and finally part of the sensing ray a passes through the passing portion 301 and enters the second accommodating chamber 103, the sensing ray a is reflected more than once in the second accommodating chamber 103, and finally reaches the receiving module 4.

[0046] Furthermore, the sleeve 1 is made of a transparent material. The sleeve 1 in this embodiment is preferably made of a glass material. The sleeve 1 in this embodiment is a circular glass tube with a closed top and an open bottom. The first reflecting portion 101 and the second reflecting portion 104 are respectively the inner walls of the sleeve 1, and the first reflecting portion 101 and the second reflecting portion 104 are parallel to each other. When the liquid level Y1 reaches or exceeds the set liquid level height b, the sensing ray a passes through the first reflecting portion 101 and / or the second reflecting portion 104 and diffuses in the liquid Y. When the liquid level Y1 is lower than the set liquid level height b, the sensing ray a is reflected by the first reflecting portion 101 and the second reflecting portion 104 and reaches the receiving module 4.

[0047] Furthermore, the transmitting module 2 and the receiving module 4 are arranged vertically, with the transmitting module 2 located above the receiving module 4 (or, the transmitting module 2 located below the receiving module 4); the transmitting module 2, the receiving module 4, the first reflecting portion 101, and the second reflecting portion 104 are respectively arranged in a liquid storage chamber e for loading liquid Y; the receiving module 4 is electrically connected to a corresponding indicator light 6 to indicate the corresponding working condition through light, such as when the liquid level Y1 does not reach the set liquid level height b, the corresponding indicator light 6 lights up; when the liquid level Y1 reaches or exceeds the set liquid level height b, the corresponding indicator light 6 lights up, and the corresponding working condition can be displayed by indicator lights 6 of different colors. Specifically, the upper portion of the sleeve 1 extends into the liquid storage chamber e, and the transmitting module 2, the receiving module 4, and the passing portion 301 then enter the liquid storage chamber e. A fixing seat 5 is provided at the bottom end of the sleeve 1, and the non-contact liquid level detection device is fixedly mounted on the vessel through the fixing seat 5.

[0048] Furthermore, the sensing ray a in this embodiment is an infrared ray (laser rays, etc. may also be used depending on actual conditions).

[0049] Furthermore, the actual position of the set liquid level height b is related to multiple parameters such as the position of the transmitting module 2, the position of the receiving module 4, the position of the crossing part 301, etc.; when various parameters are fixed, the actual position of the set liquid level height b can be determined by testing.

[0050] Second embodiment

[0051] See also Figure 10 The non-contact liquid level detection device of this embodiment is different from the first embodiment in that the penetration portion 301 is a notch structure on the barrier body 3; specifically, the penetration portion 301 is a semicircular notch provided on one side or both sides of the barrier body 3.

[0052] Other parts not described are basically the same as those in the first embodiment and will not be analyzed and described in detail here.

[0053] Third embodiment

[0054] See also Figures 11-17The non-contact liquid level detection device of this embodiment differs from the first embodiment in that the transmitting module 2 and the receiving module 4 together constitute a set of detection components c. One or more detection components c are provided, and a barrier 302 is provided between two adjacent detection components c to intercept the sensing radiation a. This prevents the sensing radiation a from being received by the receiving modules 4 in different detection components c, which could result in erroneous electrical signal generation. The non-contact liquid level detection device of this embodiment utilizes multiple detection components c to achieve multi-stage liquid level detection.

[0055] Furthermore, more than two transmitting modules 2 are connected in parallel with each other, and more than two receiving modules 4 are connected in parallel with each other; the receiving modules 4 are electrically connected to corresponding indicator lights 6 .

[0056] Other parts not described are basically the same as those in the first embodiment and will not be analyzed and described in detail here.

[0057] The above is a preferred embodiment of the present invention, which illustrates and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A non-contact liquid level detection device, comprising a transmitting module (2) for transmitting a sensing ray (a), and a receiving module (4) for receiving the sensing ray (a); characterized in that: The invention also includes a first reflecting portion (101) and a second reflecting portion (104); the transmitting module (2) corresponds to the first reflecting portion (101), and the receiving module (4) corresponds to the second reflecting portion (104); a passing portion (301) is provided between the transmitting module (2) and the receiving module (4); the first reflecting portion (101) and the second reflecting portion (104) are matched with each other; when the liquid surface (Y1) is lower than the set liquid level height (b), the sensing ray (a) is reflected by the first reflecting portion (101), passes through the passing portion (301), and finally reaches the receiving module (4) after being reflected by the second reflecting portion (104), and an electrical signal is generated on the receiving module (4); when the liquid surface (Y1) reaches or exceeds the set liquid level height (b), the sensing ray (a) diffuses in the liquid (Y), and no electrical signal is generated on the receiving module (4); The transmitting module (2) and the receiving module (4) are respectively arranged between the first reflecting portion (101) and the second reflecting portion (104); the orientation of the transmitting module (2) is opposite to that of the receiving module (4); The transmitting module (2) and the receiving module (4) are arranged vertically; the transmitting module (2), the receiving module (4), the first reflecting portion (101) and the second reflecting portion (104) are respectively arranged in a liquid storage cavity (e) for loading liquid (Y).

2. The non-contact liquid level detection device according to claim 1, characterized in that: It also includes a barrier body (3) for blocking the sensing ray (a), the passing portion (301) is arranged on the barrier body (3), the transmitting module (2) is arranged on one side of the barrier body (3), and the receiving module (4) is arranged on the other side of the barrier body (3).

3. The non-contact liquid level detection device according to claim 2, characterized in that: The passing portion (301) is a hollow structure and / or a notch structure on the barrier body (3).

4. The non-contact liquid level detection device according to claim 2, characterized in that: The invention also includes a sleeve (1) that is covered on the outside of the barrier body (3), the barrier body (3) separates the inner cavity of the sleeve (1) into a first accommodating cavity (102) and a second accommodating cavity (103), the transmitting module (2) is arranged in the first accommodating cavity (102), the receiving module (4) is arranged in the second accommodating cavity (103), the passing portion (301) is arranged between the first accommodating cavity (102) and the second accommodating cavity (103), and the sensing ray (a) in the first accommodating cavity (102) passes through the passing portion (301) and enters the second accommodating cavity (103).

5. The non-contact liquid level detection device according to claim 4, characterized in that: The sleeve (1) is made of a transparent material; the first reflecting portion (101) and the second reflecting portion (104) are respectively inner side walls of the sleeve (1), and the first reflecting portion (101) and the second reflecting portion (104) are parallel to each other; when the liquid surface (Y1) reaches or exceeds a set liquid level height (b), the sensing ray (a) passes through the first reflecting portion (101) and / or the second reflecting portion (104) and diffuses in the liquid (Y); when the liquid surface (Y1) is lower than the set liquid level height (b), the sensing ray (a) is reflected by the first reflecting portion (101) and the second reflecting portion (104) and reaches the receiving module (4).

6. The non-contact liquid level detection device according to claim 1, characterized in that: The sensing ray (a) is an infrared ray or a laser ray.

7. The non-contact liquid level detection device according to any one of claims 1 to 6, characterized in that: The transmitting module (2) and the receiving module (4) together constitute a group of detection components (c), wherein the detection components (c) are provided in one or more groups, and a blocking portion (302) for intercepting the sensing ray (a) is provided between two adjacent groups of detection components (c).

8. The non-contact liquid level detection device according to claim 7, characterized in that: Two or more transmitting modules (2) are connected in parallel with each other, and two or more receiving modules (4) are connected in parallel with each other; the receiving modules (4) are electrically connected to corresponding indicator lights (6).

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