CN115655414A - Non-contact liquid level detection device - Google Patents

Abstract

The invention relates to a non-contact liquid level detection device, which includes a transmitting module for emitting sensing rays, a receiving module for receiving sensing rays, a first reflection part and a second reflection part; the orientation and reception of the transmitting module The orientation of the modules is inconsistent, the transmitting module corresponds to the first reflecting part, and the receiving module corresponds to the second reflecting part; there is a passing part between the transmitting module and the receiving module; the first reflecting part and the second reflecting part cooperate with each other; when the liquid When the surface is lower than the set liquid level, the sensing ray is reflected by the first reflection part, passes through the passing part, and finally reaches the receiving module after being reflected by the second reflection part, and there is an electric signal on the receiving module; when the liquid level reaches or When the height is higher than the set liquid level, the sensing ray diffuses in the liquid, and there is no electrical signal on the receiving module. The non-contact liquid level detection device has the advantages of simple and reasonable structure, reliable performance, low manufacturing cost and high production efficiency.

Description

A non-contact liquid level detection device

technical field

The invention relates to a liquid level detector, in particular to a non-contact liquid level detection device.

Background technique

Existing non-contact water level sensors include:

The infrared water level sensor monitors the water level based on the reception of infrared rays; when there is no water body outside the reflective surface, the infrared rays are reflected by two mutually perpendicular reflective surfaces and finally received and generate corresponding electrical signals; when there is water body outside the reflective surface, most Or all the infrared rays are scattered into the water body, and a small part or no infrared rays are received, resulting in the disappearance of the electrical signal, and then the purpose of detecting the water level can be achieved; for example, a water detection system disclosed in Chinese patent document CN209204376U and a ventilator with the system, specifically It is disclosed 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 has a built-in beam emitting tube and a beam receiving tube", "the 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 light-transmitting materials", "the first surface The angle between the second 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 an infrared automatic The device for 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, and the light-transmitting The surface is wrapped on the liquid level detection surface of the sensor shell, the infrared emitting tube and the infrared receiving tube are respectively arranged on the left and right sides of the inside of the sensor shell, and the baffle is vertically arranged on the sides of the infrared emitting tube and the infrared receiving tube. Between", "the liquid level detection surface is a 90-degree prism structure, and the infrared rays emitted by the infrared emitting tube are reflected to the infrared receiving tube through the prism structure"; it can be seen that the existing infrared water level sensors rely on two reflective surfaces perpendicular to each other Reflecting infrared rays, in practical applications, the processing technology of the reflecting surface is relatively high (the two reflecting surfaces must be perpendicular to each other), and the direction of the transmitter is consistent with the direction of the receiver to ensure that the infrared rays can be reflected by two mutually perpendicular reflecting surfaces. Successfully received by the receiver, it can be seen that the installation position of the transmitter and receiver needs to be precise (the positional relationship with the reflective surface must be accurate), so the production and assembly are difficult and demanding, and the high-precision process requirements lead to high manufacturing costs .

The capacitive water level sensor detects the water level based on the monitoring of the capacitance value, that is, detects the water level according to the change of the capacitance value; however, there are many factors that affect the capacitance, including water quality (water quality affects conductivity), scale (scale affects capacitance value) ), current, voltage, etc., resulting in low reliability and accuracy of capacitive water level detection, and the need for complex and professional debugging in response to water quality in different areas during production, resulting in difficult production and low production efficiency.

Therefore, in view of the problems existing in the existing non-contact water level sensor, it is necessary to make further improvements.

Contents of the invention

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

The purpose of the present invention is achieved like this:

A non-contact liquid level detection device, comprising a transmitting module for emitting sensing rays, a receiving module for receiving sensing rays, a first reflecting part and a second reflecting part; the orientation of the transmitting module is the same as that of the The direction of the receiving module is not consistent, the transmitting module corresponds to the first reflecting part, and the receiving module corresponds to the second reflecting part; a passing part is arranged between the transmitting module and the receiving module; the The first reflective part and the second reflective part cooperate with each other; when the liquid level is lower than the set liquid level, the sensing rays are reflected by the first reflective part, pass through the passing part, and finally pass through the second reflective part After being reflected by the two reflectors, it reaches the receiving module, and there is an electrical signal on the receiving module; when the liquid level reaches or is higher than the set liquid level, the sensing ray diffuses in the liquid, and there is no signal on the receiving module. electric signal.

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 that of the receiving module.

As yet another specific solution, the non-contact liquid level detection device further includes a barrier body for blocking the sensing rays, the passing part is arranged on the barrier body, and the transmitting module is arranged on the On one side of the shielding body, the receiving module is arranged on the other side of the shielding body.

As yet another specific solution, the passing portion is a hollow structure and/or a notch structure on the barrier body.

As yet another specific solution, the non-contact liquid level detection device further includes a sleeve covering the outer side of the barrier body, and the barrier body separates the inner cavity of the sleeve tube into the first accommodating cavity and the second accommodating cavity. The transmitting module is arranged in the first accommodating cavity, the receiving module is arranged in the second accommodating cavity, and the passing part is arranged between the first accommodating cavity and the second accommodating cavity. Between the two accommodating cavities, the sensing rays in the first accommodating cavity enter the second accommodating cavity through the passing portion.

As yet another specific solution, the sleeve is made of transparent material; the first reflective part and the second reflective part are respectively the inner sidewall of the sleeve, and the first reflective part and the second reflective parts parallel to each other; when the liquid level reaches or is higher than the set liquid level, 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 low When the liquid level is set, the sensing rays are reflected by the first reflector and the second reflector and reach the receiving module.

As yet another specific solution, the transmitting module and the receiving module are arranged up and down; the transmitting module, the receiving module, the first reflecting part and the second reflecting part are respectively arranged on the in the reservoir chamber.

As yet another specific solution, the sensing rays are infrared rays or laser rays.

As yet another specific solution, the transmitting module and the receiving module jointly constitute a group of detection components, one or more than two groups of detection components are provided, and a sensor for intercepting the sensor is arranged between two adjacent groups of detection components. Radiation barrier.

As yet another specific solution, more than two transmitting modules are connected in parallel, and more than two receiving modules are connected in parallel; the receiving modules are electrically connected to corresponding indicator lights.

The beneficial effects of the present invention are as follows:

In this device, the direction of the transmitting module is not consistent with the direction of the receiving module, the transmitting module corresponds to the first reflecting part, the receiving module corresponds to the second reflecting part, a passing part is arranged between the transmitting module and the receiving module, the first reflecting part and the The second reflecting parts cooperate with each other; when the liquid level is lower than the set liquid level, the sensing rays are reflected by the first reflecting part, pass through the passing part, and finally reach the receiving module after being reflected by the second reflecting part, and the receiving module There is an electrical signal; when the liquid level reaches or is higher than the set liquid level, the sensing ray diffuses in the liquid, and there is no electrical signal on the receiving module. Compared with the prior art, the sensing rays in this application are reflected between two opposite reflectors (the two reflectors do not need to be perpendicular to each other), and the orientations of the transmitting module and the receiving module are inconsistent (the orientations of the transmitting module and the receiving module are different. Need to be consistent with each other), the passing part between the transmitting module and the receiving module plays the role of limiting the passage of part of the sensing rays; when the liquid level does not reach the set liquid level, the sensing rays after multiple reflections finally reach the receiving Module, so that the receiving module generates 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 sensing ray diffuses into the liquid, and the receiving module does not receive The sensing ray or the received sensing ray is insufficient, so that it cannot generate the corresponding electrical signal, and the system determines that the liquid level reaches or exceeds the set liquid level.

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 gap structure on the barrier body. In practical applications, the barrier body can be a circuit board, and related circuits are printed on the circuit board. The module and the receiving module are directly welded on the circuit board; in addition, the outer side of the shield body is covered with a sleeve, and the two reflection parts are the inner side walls of the sleeve (not a specific structure or shape). Protection and water isolation; during the overall assembly, the positional relationship between the transmitting module, the receiving module and the reflecting part is relatively low. On the one hand, it can improve assembly efficiency and production efficiency. On the other hand, it can effectively improve the yield rate and improve the stability of the device. In addition, long-term use is easy to generate scale and adhere to the outer wall of the casing, the scale becomes transparent when in contact with the liquid, and infrared rays can still diffuse into the liquid, so the scale has little effect on the detection performance of the device, and overcomes the capacitive liquid Insufficient defects of position sensors avoid the need for complicated and professional debugging due to differences in water quality and simplify the production process.

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 household appliances with liquid storage functions, etc. Fields, including water dispensers, electric kettles, coffee machines, atomizers, etc.

Description of drawings

Fig. 1 is an assembly diagram of the non-contact liquid level detection device in the first embodiment of the present invention.

Fig. 2 is an exploded view of the non-contact liquid level detection device in the first embodiment of the present invention.

Fig. 3 is a cross-sectional view of the non-contact liquid level detection device in the first embodiment of the present invention.

Fig. 4 is a partial cross-sectional schematic diagram of the non-contact liquid level detection device in the first embodiment of the present invention when it is not immersed in liquid.

Fig. 5 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 in the first embodiment of the present invention.

Fig. 6 is a partial cross-sectional schematic diagram of the non-contact liquid level detection device when the liquid level exceeds the set liquid level in the first embodiment of the present invention.

FIG. 7 is a cross-sectional view along the H-H direction in FIG. 3 .

Fig. 8 is a cross-sectional view along K-K direction in Fig. 7 .

Fig. 9 is a schematic circuit diagram of the non-contact liquid level detection device in the first embodiment of the present invention.

Fig. 10 is a partial cross-sectional view of the non-contact liquid level detection device in the second embodiment of the present invention.

Fig. 11 is an assembly diagram of the non-contact liquid level detection device in the third embodiment of the present invention.

Fig. 12 is an exploded view of the non-contact liquid level detection device in the third embodiment of the present invention.

Fig. 13 is a cross-sectional view of a non-contact liquid level detection device in a third embodiment of the present invention.

Fig. 14 is a partial cross-sectional schematic diagram of the non-contact liquid level detection device in the third embodiment of the present invention when it is not immersed in liquid.

Fig. 15 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 third embodiment of the present invention.

Fig. 16 is a partial cross-sectional schematic diagram of the non-contact liquid level detection device when the liquid level exceeds the set liquid level in the third embodiment of the present invention.

Fig. 17 is a schematic circuit diagram of the non-contact liquid level detection device in the third embodiment of the present invention.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

first embodiment

Referring to FIGS. 1-9 , the non-contact liquid level detection device involved in this embodiment includes a transmitting module 2 for emitting sensing rays a, a receiving module 4 for receiving sensing rays a, and a first reflecting part 101 and the second reflector 104; the orientation of the transmitter module 2 is inconsistent with the orientation of the receiver module 4, the transmitter module 2 corresponds to the first reflector 101, the receiver module 4 corresponds to the second reflector 104; the transmitter module 2 and the receiver module 4 There is a passing part 301 between them; the first reflecting part 101 and the second reflecting part 104 cooperate 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 part 101 and passes through Pass through the passing part 301, and finally reach the receiving module 4 after being reflected by the second reflecting part 104, and there is an electric signal 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 In Y (specifically referring to the water body), there is no electrical signal on the receiving module 4 . In the non-contact liquid level detection device in this embodiment, the sensing ray a is reflected between two opposite reflecting parts (the first reflecting part 101 and the second reflecting part 104) (the first reflecting part 101 and the second reflecting part 104) Reflecting part 104 is not vertical), the orientation of transmitting module 2 and receiving module 4 is inconsistent, and the passing part 301 between transmitting module 2 and receiving module 4 plays the role of limiting the passage of part of the sensing ray a; when the liquid surface Y1 is not When the set liquid level height b is reached, the sensing ray a after multiple reflections finally reaches the receiving module 4, so that the receiving module 4 generates 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 When reaching or exceeding the set liquid level height b, the sensing ray a diffuses into the liquid Y, and the receiving module 4 cannot generate the corresponding electrical signal because it does not receive the sensing ray a or the received sensing ray a is insufficient , the system judges that the liquid level reaches or exceeds 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. The method is not affected by external factors such as water quality and scale, so the detection performance of the device is reliable and adaptable, and there is no need for debugging during production, thereby improving production efficiency.

Further, the transmitting module 2 and the receiving module 4 are respectively arranged between the first reflecting part 101 and the second reflecting part 104. In this embodiment, the first reflecting part 101 and the second reflecting part 104 are parallel to each other, and the sensing ray a Multiple reflections can be realized between the first reflection part 101 and the second reflection part 104, and the direction is changed through reflection, so that several sensing rays a finally reach the receiving module 4 to be received by it; see Fig. 3-6, the transmitting module 2 The orientation of the receiving module 4 is opposite to that of the receiving module 4, that is, the transmitting end of the transmitting module 2 faces the first reflecting part 101, and the receiving end of the receiving module 4 faces the second reflecting part 104. The sensing ray a needs to be reflected through an effective reflecting surface. The height position of the liquid surface Y1 can directly affect the effectiveness of the emitting surface, thereby achieving the purpose of detecting the liquid level.

Further, the non-contact liquid level detection device also includes a barrier body 3 for blocking the sensing ray a, the passing part 301 is opened on the barrier body 3, and the transmitting module 2 is arranged on one side of the barrier body 3 (as described above side), the receiving module 4 is arranged on the other side (such as the rear side) of the barrier body 3 . Specifically, in practical applications, the barrier body 3 can be a circuit board (the material of the circuit board is selected to have a shielding and blocking effect on the sensing ray a), the relevant circuits are printed on the circuit board, and the transmitting module 2 and the receiving module 4 are respectively It is fixed on the circuit board by welding, and the passing part 301 is directly set on the circuit board. In order to further ensure the barrier performance of the circuit board, a metal diaphragm for shielding/reflecting the sensing ray a can be selectively added on the circuit board. ; The transmitting module 2 and the receiving module 4 are distributed up and down.

Further, referring to FIG. 7, the passing portion 301 in this embodiment is a circular hollow structure on the barrier body 3, and 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 not. regular shape.

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

Further, the sleeve 1 is made of a transparent material. The sleeve 1 in this embodiment is preferably made of glass material. The sleeve 1 in this embodiment is a circular glass tube with a closed top and an open bottom. ; The first reflector 101 and the second reflector 104 are respectively the inner wall of the sleeve 1, and the first reflector 101 and the second reflector 104 are parallel to each other; when the liquid level Y1 reaches or is higher than the set liquid level height b , the sensing ray a diffuses in the liquid Y through the first reflecting part 101 and/or the second reflecting part 104; when the liquid surface Y1 is lower than the set liquid level b, the sensing ray a passes through the first reflecting part 101 After being reflected by the second reflecting part 104, it reaches the receiving module 4 .

Further, the transmitting module 2 and the receiving module 4 are arranged up and down, and the transmitting module 2 is located above the receiving module 4 (or, the transmitting module 2 is located below the receiving module 4); the transmitting module 2, the receiving module 4, the first reflector 101 and the second The two reflectors 104 are respectively arranged in the liquid storage chamber e used to load the liquid Y; the receiving module 4 is electrically connected to the corresponding indicator light 6 to indicate the corresponding working conditions through the light, such as the liquid level Y1 does not reach the set liquid level height b , the corresponding indicator light 6 lights up, and 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 conditions can be displayed through the indicator lights 6 of different colors. Specifically, the upper part of the casing 1 extends into the liquid storage chamber e, and the transmitting module 2, the receiving module 4 and the passing part 301 enter into the liquid storage chamber e accordingly. The liquid level detection device is fixedly installed on the container through the fixing seat 5 .

Further, the sensing ray a in this embodiment is an infrared ray (laser ray, etc. can also be selected according to actual conditions).

Further, 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, and the position of the crossing part 301; when all parameters are fixed, the set liquid level can be determined by testing The actual position at height b.

second embodiment

Referring to FIG. 10 , the non-contact liquid level detection device involved in this embodiment is different from the first embodiment in that: the passing part 301 is a gap structure on the barrier body 3; A semicircular notch on one or both sides.

Other parts not described are basically consistent with the first embodiment, and will not be analyzed and described in detail here.

third embodiment

Referring to Fig. 11-Fig. 17, the non-contact liquid level detection device involved in this embodiment is different from the first embodiment in that: the transmitting module 2 and the receiving module 4 together form a group of detection components c, and a group of detection components c is set Or two or more groups, between adjacent two groups of detection components c is provided with a blocking part 302 for intercepting the sensing ray a, so as to prevent the sensing ray a from being received by the receiving module 4 in different detection components c, resulting in wrong generation of electrical signals. The non-contact liquid level detection device in this embodiment can realize multi-stage liquid level detection through multiple sets of detection components c.

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

Other parts not described are basically consistent with the first embodiment, and will not be analyzed and described in detail here.

The above is the preferred solution of the present invention, showing and describing 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 by the above-mentioned embodiments, and what described in the above-mentioned embodiments and the description only illustrates the principle of the present invention, and the present invention also has various aspects without departing from the spirit and scope of the present invention. Variations and improvements, which fall within the scope of the claimed invention. The protection scope of the present invention is defined by the appended claims and their equivalents.

Claims (10)

1. A non-contact liquid level detection device, comprising a transmitting module (2) for emitting sensing rays (a), and a receiving module (4) for receiving sensing rays (a); characterized in that: It also includes a first reflection part (101) and a second reflection part (104); the direction of the transmitting module (2) is inconsistent with the direction of the receiving module (4), and the direction of the transmitting module (2) and the second A reflecting part (101) corresponds, the receiving module (4) corresponds to the second reflecting part (104); a passing part (301) is arranged between the transmitting module (2) and the receiving module (4) ); the first reflection part (101) and the second reflection part (104) cooperate with 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 part (101), passes through the passing part (301), and finally reaches the receiving module (4) after being reflected by the second reflecting part (104). On the receiving module (4) There is an electrical signal; when the liquid level (Y1) reaches or exceeds the set liquid level height (b), the sensing ray (a) diffuses in the liquid (Y), and there is no electric signal on the receiving module (4) Signal. 2. The non-contact liquid level detection device according to claim 1, characterized in that: the transmitting module (2) and the receiving module (4) are respectively arranged on the first reflecting part (101) and the Between the second reflecting parts (104); the direction of the transmitting module (2) is opposite to that of the receiving module (4). 3. The non-contact liquid level detection device according to claim 1, characterized in that it further comprises a barrier body (3) for blocking the sensing ray (a), and the passing part (301) is set at 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) superior. 4. The non-contact liquid level detection device according to claim 3, characterized in that: the passing portion (301) is a hollow structure and/or a notch structure on the barrier body (3). 5. The non-contact liquid level detection device according to claim 3, characterized in that it further comprises a sleeve (1) covering the outside of the barrier body (3), and the barrier body (3) covers the The inner cavity of the sleeve (1) separates a first accommodating cavity (102) and a second accommodating cavity (103), the launch module (2) is arranged in the first accommodating cavity (102), the The receiving module (4) is arranged in the second accommodating cavity (103), and the passing part (301) is arranged between the first accommodating cavity (102) and the second accommodating cavity (103) During this time, the sensing ray (a) in the first accommodating cavity (102) enters the second accommodating cavity (103) through the passing portion (301). 6. The non-contact liquid level detection device according to claim 5, characterized in that: the sleeve (1) is made of transparent material; the first reflection part (101) and the second reflection part ( 104) are respectively the inner wall of the sleeve (1), the first reflector (101) and the second reflector (104) are parallel to each other; when the liquid level (Y1) reaches or exceeds the set liquid At height (b), the sensing ray (a) diffuses in the liquid (Y) through the first reflection part (101) and/or the second reflection part (104); when the liquid surface ( When Y1) is lower than the set liquid level height (b), the sensing ray (a) reaches the receiving module ( 4). 7. The non-contact liquid level detection device according to claim 1, characterized in that: the transmitting module (2) and the receiving module (4) are arranged up and down; the transmitting module (2), the receiving module The module (4), the first reflection part (101) and the second reflection part (104) are respectively arranged in a liquid storage chamber (e) for loading liquid (Y). 8. 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. 9. The non-contact liquid level detection device according to any one of claims 1-8, characterized in that: the transmitting module (2) and the receiving module (4) together form a set of detection components (c), The detection components (c) are arranged in one or more groups, and a blocking part (302) for intercepting the sensing ray (a) is arranged between two adjacent groups of detection components (c). 10. The non-contact liquid level detection device according to claim 9, characterized in that: 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 module (4) is electrically connected to the corresponding indicator light (6).

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