Non-contact automatic water supply control induction device
By using Doppler microwave and dual-antenna structures in the automatic water supply control system, the problems of infrared sensor contamination and radar sensing system malfunction are solved, and the induction control with high signal-to-noise ratio is realized, which improves the The practicality and maintenance of the system.
Patent Information
- Application Number
- CN202420849271.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-23
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-04-23
AI Technical Summary
The existing automatic water supply control system has a reduced sensitivity when infrared sensors are contaminated or environmentally disturbed, which is prone to identification errors. Moreover, the radar sensing system is difficult to control the sensing distance due to the multi-point and multi-path reflection characteristics, resulting in malfunction and difficulty in maintaining.
Using parallel arrangement of patch antennas and metasurface conformal antennas, Doppler microwaves are used for induction, and signal is enhanced through dual antenna structure, combined with microcontrollers and buzzers to achieve high signal-to-noise ratio induction control to avoid the environment Frequency interference.
It improves induction accuracy and practicality, reduces false alarms and malfunctions, is suitable for humid environments, and the device is easy to disassemble and install and maintain.
Smart Images
Figure CN222255255U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of induction control, in particular to a non-contact automatic water supply control induction device. Background Art
[0002] In the past, users had to manually operate the faucet switch to open or close the faucet. However, in public places, the above operation method is easy to cause germs to spread, and there are also cases where people forget to close the faucet after leaving or the faucet is not closed tightly, which not only wastes water resources but also reduces the user experience. For this reason, the automatic water supply control system came into being.
[0003] Traditional automatic water supply control systems mostly use infrared emission and reception to identify whether a hand is close to the faucet. This method has the advantages of low power consumption and battery power. However, when the window of the infrared sensor is contaminated by scale, soap, etc., or when there is interference such as special light in the environment, the sensitivity of the induction will be significantly reduced, and it is easy to have problems such as recognition errors or difficulty in recognition. At the same time, infrared sensors are mostly integrated into the faucet. Once the infrared sensor fails, it is difficult to disassemble and there is a problem of difficulty in maintenance.
[0004] The existing technology has also improved the automatic water supply control system based on radar sensing signals, such as the solutions disclosed in Chinese utility model patents CN203836341U, CN204512633U, CN206929406U, etc. These solutions all propose to place the radar antenna inside or on the surface of the faucet and use radar sensing to control the water flow of the faucet. However, due to the multi-point and multi-path reflection characteristics of radar signals, it is difficult to actually control the sensing distance in the above patents, and it is also easy to be disturbed and cause malfunctions, and the effect is not good in actual use.
[0005] Therefore, it is necessary to make improvements to the problems in the prior art. Utility Model Content
[0006] The utility model aims to provide a non-contact automatic water supply control sensing device, aiming to solve the problems in the prior art.
[0007] In order to achieve the above-mentioned purpose, the utility model provides a contactless automatic water supply control sensing device, which includes a patch antenna and a metasurface conformal antenna arranged in parallel; the patch antenna includes a floor layer and a radar transceiver antenna and a radar circuit board respectively arranged on two sides of the floor layer, the radar transceiver antenna is electrically connected to the radar circuit board, and the microwaves received and transmitted by the radar transceiver antenna are Doppler microwaves; a conductive patch array layer is arranged on one side of the metasurface conformal antenna; the side where the radar transceiver antenna is located is opposite to the side where the conductive patch array layer is located, and the distance D between the conductive patch array layer of the metasurface conformal antenna and the floor layer of the patch antenna is 1 / 4 to 1 / 32 of the wavelength emitted by the radar transceiver antenna.
[0008] Furthermore, the length L of the conductive patch is 3.6-6 mm, the width H1 is 2-3.5 mm, and the gap width H2 between the conductive patches is 0.2-0.8 mm.
[0009] Furthermore, the distance D between the patch antenna and the metasurface conformal antenna is 1.7-1.8 mm.
[0010] Furthermore, the microwaves transmitted and received by the radar transceiver antenna are X-band Doppler microwaves with a transmission power less than -10dBm.
[0011] Furthermore, the sensing action distance of the sensing device in the back direction and the surrounding direction is less than 20% of the sensing action distance in the forward direction.
[0012] Furthermore, the patch antenna is surrounded by a metal shielding ring.
[0013] Furthermore, the sensing device also includes a micro control unit, which is electrically connected to the radar circuit board and installed on the radar circuit board.
[0014] Furthermore, the patch antenna, the metasurface conformal antenna and the microcontroller unit are encapsulated in a high-frequency potting agent with low dielectric constant and low loss angle.
[0015] Furthermore, the potting body is installed in an injection-molded shell made of PPT material, and the shell is affixed with 3M VHB double-sided tape.
[0016] Furthermore, the sensing device also includes a buzzer, which is controlled by a microcontroller unit and integrated into a radar circuit board; the radar circuit board is also integrated with an external interface, which is one or more of a pulse control output interface, a power supply interface, and a sensing distance adjustment interface.
[0017] The utility model provides a non-contact automatic water supply control sensing device, which uses Doppler microwaves to achieve sensing, is not easily disturbed by environmental frequencies, and meets the needs of sensing control; in order to improve the sensing accuracy, it adopts a dual antenna structure, and when the microwaves emitted by the radar transceiver antenna encounter the metasurface conformal antenna, part of the microwaves are reflected, and reflected again at the floor layer of the patch antenna, resulting in superposition enhancement, and then transmitted outward through the gap of the metasurface conformal antenna to enhance the emitted signal; similarly, the reflected signal enters the radar transceiver antenna after being enhanced by the above structure, which improves the signal-to-noise ratio and is beneficial to subsequent signal processing. The above makes the non-contact automatic water supply control sensing device of the utility model practical. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 This is a simplified structural diagram of the non-contact automatic water supply control sensing device of the utility model;
[0019] Figure 2 It is a structural diagram when the patch antenna and the metasurface conformal antenna are placed relative to each other;
[0020] Figure 3 is a side view of the patch antenna;
[0021] Figure 4 is a side view of the metasurface conformal antenna;
[0022] Figure 5 This is a partial enlarged view of point A in the figure.
[0023] Description of reference numerals:
[0024] 1. Patch antenna; 11. Floor layer; 12. Radar transceiver antenna; 13. Radar circuit board; 14. Metal shielding ring;
[0025] 2. Metasurface conformal antenna; 21. Conductive patch;
[0026] 3. Micro control unit;
[0027] 4. Buzzer;
[0028] 5. External interface. DETAILED DESCRIPTION
[0029] The following is a detailed description of the embodiments of the present utility model.
[0030] In this embodiment, unless otherwise clearly specified and limited, when terms such as "set on", "connected", and "connected" appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or connected through one or more intermediate media. For those skilled in the art, the specific meanings of the above terms in this embodiment can be understood according to the specific circumstances. The directional words that appear in this embodiment are to better illustrate the characteristics of the features and the relationship between the features. It should be understood that when the placement direction of this embodiment changes, the characteristics of the features and the direction of the relationship between the features also change accordingly. Therefore, the directional words do not constitute an absolute limitation on the characteristics of the features and the relationship between the features in space, but only play a relative limitation role.
[0031] The utility model provides a non-contact automatic water supply control sensing device, such as Figures 1 to 5 As shown, it includes a patch antenna 1 and a metasurface conformal antenna 2 arranged in parallel.
[0032] The patch antenna 1 includes a floor layer 11 and a radar transceiver antenna 12 and a radar circuit board 13 respectively arranged on both sides of the floor layer 11. The radar transceiver antenna 12 is electrically connected to the radar circuit board 13. The microwaves received and transmitted by the radar transceiver antenna 12 are Doppler microwaves; preferably, the microwaves received and transmitted by the radar transceiver antenna 12 are X-band Doppler microwaves with a transmission power less than -10dBm; further preferably, less than -15dBm. The preferred frequency point of this embodiment avoids the crowded 5-6GHz (common mobile phone and WIFI frequency points), is not easily interfered by environmental frequencies, and meets the needs of induction control. A conductive patch 21 array layer is provided on one side of the metasurface conformal antenna 2; the side where the radar transceiver antenna 12 is located is opposite to the side where the conductive patch 21 array layer is located, and the distance D between the conductive patch 21 array layer of the metasurface conformal antenna 2 and the floor layer 11 of the patch antenna 1 is 1 / 4 to 1 / 32 of the wavelength emitted by the radar transceiver antenna 12.
[0033] When in use, the induction device is installed outside the side wall of the ceramic water tank. The microwaves emitted by the induction device pass through the side wall of the ceramic water tank and then head toward the water flow direction of the faucet to achieve induction.
[0034] Based on the above structural setting, this non-contact automatic water supply control sensing device uses Doppler microwaves to achieve sensing, which is not easily disturbed by environmental frequencies and meets the needs of sensing control; in order to improve the sensing accuracy, it adopts a dual antenna structure. When the microwaves emitted by the radar transceiver antenna 12 encounter the metasurface conformal antenna 2, part of it is reflected and reflected again at the floor layer 11 of the patch antenna 1, resulting in superposition enhancement, and then transmitted outward through the gap of the metasurface conformal antenna 2 to enhance the emitted signal; similarly, the reflected signal enters the radar transceiver antenna 12 after being enhanced by the above structure, which improves the signal-to-noise ratio and is beneficial to subsequent signal processing. Through the above principle, the transmission and reception signals are provided with gain, the signal attenuation generated by penetrating the ceramic water tank (including the attached water film and soap foam) is compensated, the signal strength of the antenna back lobe and side lobe is suppressed, and the back-reflected signal error is eliminated.
[0035] In this embodiment, the length L of the conductive patch 21 is 3.6 to 6 mm, the width H1 is 2 to 3.5 mm, and the gap width H2 between the conductive patches 21 is 0.2 to 0.8 mm. The distance D between the patch antenna 1 and the metasurface conformal antenna 2 is 1.7 to 1.8 mm. Preferably, the sensing device uses a frequency of 10.525 GHz and a wavelength of 28.5 mm. The distance H3 between the array layer of the conductive patch 21 of the metasurface conformal antenna 2 and the floor layer 11 of the patch antenna 1 is 1 / 16 of the wavelength emitted by the radar transceiver antenna 12, which is about 1.8 mm. According to experiments, the sensing device in the above size range has a better sensing effect when used for water supply control.
[0036] In this embodiment, the sensing action distance of the sensing device in the back direction and the surrounding direction is less than 20% of the sensing action distance in the forward direction, so as to compress the radar sidelobe signal and reduce false alarms and malfunctions.
[0037] In this embodiment, the patch antenna 1 is surrounded by a metal shielding ring 14, which can reflect the surrounding microwaves so that the microwaves return to between the metasurface conformal antenna 2 and the patch antenna 1 and generate superposition increase, thereby further amplifying the transmitted and received signals.
[0038] In this embodiment, the sensing device further includes a micro control unit 3, which is electrically connected to and mounted on the radar circuit board 13. The micro control unit 3 uses the sensed situation as a basis for judgment and outputs a signal to the outside to control the faucet.
[0039] In this embodiment, the patch antenna 1, the metasurface conformal antenna 2 and the microcontroller unit 3 are encapsulated in a high-frequency potting compound with a low dielectric constant and a low loss angle, with a protection level of IP66 or above; preferably, the high-frequency potting compound preferably uses a polyurethane resin. The above arrangement enables the sensing device to be used for a long time in a humid washing environment, and the potting structure does not affect the performance of the sensing device. Further preferably, the potting body is mounted in an injection-molded shell of PPT material to further protect the sensing device. In addition, the shell is affixed with 3M VHB double-sided tape, and the shell (that is, the sensing device) is adhered to the outside of the side wall of the ceramic sink with the help of VHB double-sided tape, which is very convenient for disassembly and assembly.
[0040] In this embodiment, the sensing device further includes a buzzer 4, which is controlled by the microcontroller unit 3 and integrated in the radar circuit board 13. The buzzer 4 is used for operation reminder or fault alarm. The radar circuit board 13 is also integrated with an external interface 5, which is one or more of a pulse control output interface, a power supply interface, and a sensing distance adjustment interface to connect other components required for faucet control.
[0041] In summary, this non-contact automatic water supply control sensing device has good practicability.
[0042] In the absence of conflict, the above-mentioned embodiments and features thereof may be combined with each other.
[0043] Finally, it should be noted that the above embodiments are only used to illustrate the preferred technical solutions of the utility model, rather than to limit the protection scope of the utility model. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solutions of the utility model can be modified or replaced by equivalents without departing from the essence and scope of the utility model.
Claims
1. A non-contact automatic water supply control sensing device, characterized in that: It includes a patch antenna (1) and a metasurface conformal antenna (2) arranged in parallel; The patch antenna (1) comprises a floor layer (11) and a radar transceiver antenna (12) and a radar circuit board (13) respectively arranged on two sides of the floor layer (11); the radar transceiver antenna (12) is electrically connected to the radar circuit board (13); and the microwaves transmitted and received by the radar transceiver antenna (12) are Doppler microwaves; A conductive patch (21) array layer is provided on one side of the metasurface conformal antenna (2); The side where the radar transceiver antenna (12) is located is opposite to the side where the conductive patch (21) array layer is located, and the distance D between the conductive patch (21) array layer of the metasurface conformal antenna (2) and the floor layer (11) of the patch antenna (1) is 1 / 4 to 1 / 32 of the wavelength emitted by the radar transceiver antenna (12).
2. The non-contact automatic water supply control sensing device according to claim 1 is characterized in that: The length L of the conductive patch (21) is 3.6 to 6 mm, the width H1 is 2 to 3.5 mm, and the width H2 of the gap between the conductive patches (21) is 0.2 to 0.8 mm.
3. The non-contact automatic water supply control sensing device according to claim 1, characterized in that: The distance D between the patch antenna (1) and the metasurface conformal antenna (2) is 1.7 to 1.8 mm.
4. The non-contact automatic water supply control sensing device according to claim 1, characterized in that: The microwaves received and transmitted by the radar transceiver antenna (12) are Doppler microwaves in the X-band and with a transmission power less than -10 dBm.
5. The non-contact automatic water supply control sensing device according to any one of claims 1 to 4, characterized in that: The sensing action distance of the sensing device in the back direction and the surrounding direction is less than 20% of the sensing action distance in the forward direction.
6. The non-contact automatic water supply control sensing device according to claim 5, characterized in that: The patch antenna (1) is surrounded by a metal shielding ring (14).
7. The non-contact automatic water supply control sensing device according to claim 1, characterized in that: The sensing device also includes a micro control unit (3), which is electrically connected to the radar circuit board (13) and mounted on the radar circuit board (13).
8. The non-contact automatic water supply control sensing device according to claim 7, characterized in that: The patch antenna (1), the metasurface conformal antenna (2) and the microcontroller unit (3) are packaged in a high-frequency potting glue with a low dielectric constant and a low loss angle.
9. The non-contact automatic water supply control sensing device according to claim 8, characterized in that: The potting body is installed in an injection-molded shell made of PPT material, and the shell is affixed with 3M VHB double-sided tape.
10. The non-contact automatic water supply control sensing device according to claim 7, characterized in that: The sensing device also includes a buzzer (4), the buzzer (4) is controlled by a micro control unit (3), and the buzzer (4) is integrated on a radar circuit board (13); The radar circuit board (13) is also integrated with an external interface (5), and the external interface (5) is one or more of a pulse control output interface, a power supply interface, and a sensing distance adjustment interface.