A microwave sensor

Abstract

The utility model relates to a microwave sensor, belonging to the technical field of microwave sensors, comprising a rotating shaft assembly, a sensing element and a controller, wherein the sensing element and the controller are placed on the rotating shaft assembly, the controller is electrically connected to the sensing element and the rotating shaft assembly respectively, the controller is provided with a standard level signal strength value, and when the strength value of the real-time level signal received by the controller is lower than the standard level signal strength value, the controller instructs the rotating shaft assembly to rotate; the beneficial effects of the utility model are as follows: the rotation of the rotating shaft assembly is controlled by the controller to drive the rotation of the sensing element, so as to achieve the effect of cleaning dust attached to the sensing element, thereby improving the sensitivity and service life of the sensor; in addition, the base and the shell made of copper material can effectively shield interference from objects above.

Description

Technical Field

[0001] The utility model belongs to the technical field of sensors, and in particular relates to a microwave sensor. Background Art

[0002] Microwave sensors are widely used in home products where automatic sensing control is required. They are also called microwave radars. They use the Doppler principle to transmit high-frequency electromagnetic waves through the transmitting antenna to detect objects within a certain range and feed back to the receiving antenna, thereby determining the existence and movement of objects within a certain coverage range.

[0003] Generally speaking, the environment in which microwave sensors exist changes in real time. Water vapor in rainy weather or humidity in the installation environment will cause short-circuit damage to the electronic components inside the sensor. Dust scattered in the air will affect the deviation of the microwave signals sent and received by the antenna on the sensor, thereby affecting the sensitivity of the sensor and the user experience. When the scattered dust encounters water vapor, its adhesion will increase, thereby increasing the difficulty of cleaning. In view of this problem, the present invention is proposed. Utility Model Content

[0004] The utility model provides a microwave sensor, which solves the problem that dust or water drops are easily adhered to the sensing element of the existing microwave sensor during use, thus affecting the sensitivity of the microwave sensor.

[0005] The purpose of the utility model can be achieved through the following technical solutions: a microwave sensor, comprising a rotating shaft assembly, a sensing element and a controller, wherein the sensing element and the controller are placed on the rotating shaft assembly, and the controller is electrically connected to the sensing element and the rotating shaft assembly respectively, the sensing element is used to receive a real-time level signal and upload it to the controller, the controller is provided with a standard level signal strength value, and the controller instructs the rotating shaft assembly to rotate when the strength value of the real-time level signal received by the controller is lower than the standard level signal strength value.

[0006] Preferably, the controller instructs the rotating shaft assembly to stop when the strength value of the real-time level signal received by the controller is equal to or higher than the strength value of the standard level signal.

[0007] Preferably, it also includes a base and a shell, wherein the base is installed on a building, and the sensor element and the controller are installed on the base through the rotating shaft assembly, and the shell is buckled on the base; the base and the shell are both made of copper, and the shell is provided with a microwave directional transceiver port.

[0008] Preferably, it also includes an outer cover, which is detachably buckled on the microwave directional transceiver port.

[0009] Preferably, the inner wall surface of the shell is covered with a sound-absorbing layer, and the sound-absorbing layer is made of sound-insulating cotton.

[0010] Preferably, the rotating shaft assembly includes a rotating part and a telescopic rod, the rotating part is connected to the base via the telescopic rod, the sensor element and the controller are both mounted on the rotating part; the telescopic rod and the rotating part are both electrically connected to the controller.

[0011] The beneficial effects of the utility model are:

[0012] The controller is electrically connected to the sensor element and the rotating shaft assembly respectively, that is, the controller can control the rotation of the rotating shaft assembly according to the intensity value of the level signal sent by the sensor element, so as to achieve the effect of cleaning dust and water droplets attached to the sensor element as needed. In addition, the base and the shell are made of copper material, and the setting of the telescopic rod can further improve the sensitivity of the sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to facilitate understanding by those skilled in the art, the present invention is further described below in conjunction with the accompanying drawings.

[0014] Figure 1 It is a schematic diagram of the structure of the utility model;

[0015] Description of main symbols:

[0016] In the figure: 1. base; 2. rotating shaft assembly; 3. telescopic rod; 4. housing; 5. sensor element; 6. outer cover. DETAILED DESCRIPTION

[0017] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose of the utility model, the specific implementation method, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0018] According to the technicians in this field, the rotation of the rotating shaft assembly, the extension and retraction of the telescopic rod and the control principles of the rotating shaft assembly and the telescopic rod by the controller in this case are all well-known means in the field and will not be repeated here. The following implementation only describes the principles and specific implementation processes.

[0019] See also Figure 1A microwave sensor in this embodiment includes a rotating shaft assembly 2, a sensing element 5 and a controller. The sensing element 5 and the controller are arranged on the rotating shaft assembly 2. The rotating shaft assembly 2 is used to drive the sensing element 5 and the controller to rotate. There are transmitting and receiving antennas in the sensing element 5. When the microwave sensor is working, the transmitting antenna on the sensing element 5 transmits microwave signals to a certain coverage range. When it encounters an object of a specific frequency, it will be reflected back to the receiving antenna. The sensing element 5 converts the received microwave signal into a level signal and uploads it to the controller. The working principle of the sensing element 5 is the working principle of a general microwave sensor. When a certain degree of dust is attached to the surface of the transmitting and receiving antennas, the reflected microwave signal received by the receiving antenna will be attenuated to a certain extent, which will affect the judgment of the subsequent controller.

[0020] Optionally, the rotating shaft assembly 2 includes a rotating shaft, which includes a rotating part and a supporting structure located on both sides of the rotating part. In this case, the rotating shaft can be driven by a motor, and the supporting structure is used to install the sensor element 5 and the controller. The rotating part can carry the supporting part and the sensor element 5 and the controller thereon to rotate in a horizontal plane around a fixed axis. The telescopic rod 3 is installed in the rotating shaft to adjust the longitudinal extension and retraction of the rotating shaft.

[0021] The level signal strength value is used to evaluate the strength of the level signal. The standard level signal strength value is the conversion value of the microwave signal value at which the sensor element 5 can work normally. The real-time level signal strength value is used to represent the latest level signal strength value received by the sensor. The controller compares the real-time level signal strength with the set standard level signal strength value to determine:

[0022] On the one hand, when the real-time level signal strength value is lower than the standard level signal strength value, that is, a certain degree of dust is attached to the surface of the sensor element 5, the controller determines that the sensor element 5 needs to be cleaned, and sends a rotation instruction to the rotating shaft assembly 2, and the rotating shaft assembly 2 then rotates to drive the rotation of the sensor element 5 and the controller, thereby achieving the function of cleaning the dust;

[0023] On the other hand, when the real-time level signal strength value is equal to or higher than the standard level signal strength value, that is, the microwave signal received by the receiving antenna on the sensor element 5 is at a normal operating frequency, the microwave sensor is in a normal working state, and the controller does not instruct the rotating shaft assembly 2 to rotate, and the rotating shaft assembly 2 stops rotating immediately.

[0024] Regarding the rotational speed of the rotating shaft assembly 2 in this case, a rotational speed experiment can be performed under a general experimental environment when the controller determines that the rotating shaft assembly 2 needs to rotate, and the rotational speed can be adjusted within a specified time, and repeated experiments can be performed until an optimal rotational speed is obtained as the rotational speed of the rotating shaft assembly 2 in this case.

[0025] Furthermore, in the above embodiment, when the rotating shaft assembly 2 rotates, the controller continuously receives the real-time level signal from the sensor element 5 and feeds it back to the rotating shaft assembly 2. In view of this, the present embodiment is proposed in consideration of energy consumption, environmental protection and the life of the sensor itself. That is, in the working mode of the above embodiment, the controller receives the real-time level signal from the sensor element 5 and determines whether it is necessary to send a rotation instruction to the rotating shaft assembly 2 again according to the strength of the real-time level signal:

[0026] If the controller continues to send a rotation instruction to the rotating shaft assembly 2, the rotating shaft assembly 2 continues to rotate until the next real-time level signal strength value is equal to or higher than the standard level signal strength value, so that the dust on the surface of the sensor element 5 can be cleaned;

[0027] If the controller does not send a rotation command to the rotating shaft component 2, the rotating shaft component 2 stops rotating, indicating that the dust and water droplets attached to the sensor element 5 have been cleaned up, until the next real-time level signal strength value is lower than the standard level signal strength value, and the controller sends a rotation command to the rotating shaft component 2 again;

[0028] In this way, the controller can control the rotating shaft assembly 2 to rotate when needed, that is, the sensor element 5 can start the rotation function when it is necessary to clean the attached dust and water droplets. This can not only save energy, but also reduce the loss of components of the rotating shaft assembly 2 itself due to excessive rotation time, thereby increasing the service life of the microwave sensor.

[0029] As a further preferred embodiment, the microwave sensor of the above embodiment further comprises a base 1 and a housing 4. Optionally, the housing 4 is a truncated cone-shaped structure with two ends connected to each other. The upper end of the truncated cone-shaped housing 4 is connected to the base 1 to form an opening connected to the inner cavity. The rotating shaft assembly 2, the sensor element 5 and the controller are all placed in the inner cavity.

[0030] Microwave sensors are usually installed above a certain space to detect objects within a certain coverage range below them, and the antenna on the sensor element 5 will generate high-frequency waves in the up and down directions, so objects above the installation point will also be detected, causing misjudgment of the sensor element 5 and affecting the user experience. Therefore, the base 1 and the shell 4, both made of copper material, can effectively regulate the signal transmission and reception range of the antenna on the sensor element 5, thereby shielding the interference from above the microwave sensor. The shell is provided with a microwave directional transceiver port, which can further improve the accuracy and detection efficiency of the microwave sensor.

[0031] As a preferred embodiment, the lower end of the above-mentioned shell 4 is detachably connected to an outer cover 6, and the outer cover 6 is detachably buckled on the microwave directional transceiver port. The lower end of the microwave directional transceiver port is provided with folded edges flush with it on both sides, and there are bolt holes on both sides for installation at specified positions. The outer cover 6 is provided with fixing holes that match the bolt holes. The detachable outer cover 6 can be covered during transportation or when the microwave sensor is idle, so as to protect internal components and prevent dust and water. Technical personnel in this field can restore the detachable connection method between the above-mentioned microwave directional transceiver port and the outer cover 6 during actual implementation, and this case will not be repeated in the example diagram.

[0032] Further as a preferred embodiment, the above-mentioned microwave sensor also includes a sound-absorbing layer made of sponge material, and the sound-absorbing layer is made of sound-insulating cotton, which can effectively absorb or attenuate the noise generated by the rotation of the rotating shaft assembly 2 on the microwave sensor, so that the noise of the microwave sensor during rotation is significantly reduced.

[0033] As a further preferred embodiment, the microwave sensor further comprises a telescopic rod 3, which is controlled by the controller and is used to connect the sensor element 5 and the rotating shaft assembly 2. Due to the influence of the installation height of the microwave sensor, the sensitivity of the sensor element 5 will also be affected. When used for the first time, according to the specific installation height, the controller determines whether the signal is weakened by comparing the real-time level signal strength value with the standard level signal strength value:

[0034] When the real-time level signal strength value is lower than the standard level signal strength value, it indicates that the signal is attenuated, and the controller controls the telescopic rod 3 to extend downward to a reasonable position;

[0035] Otherwise, the telescopic rod 3 is not adjusted downward.

[0036] The extension and retraction of the sensor element 5 is adjusted by adjusting the extension and retraction of the telescopic rod 3 , so as to improve the sensitivity of the sensor element 5 .

[0037] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A microwave sensor, characterized in that: The invention comprises a rotating shaft assembly (2), a sensing element (5) and a controller, wherein the sensing element (5) and the controller are placed on the rotating shaft assembly (2), the controller is electrically connected to the sensing element (5) and the rotating shaft assembly (2) respectively, the controller is provided with a standard level signal strength value, and when the strength value of the real-time level signal received by the controller is lower than the standard level signal strength value, the controller instructs the rotating shaft assembly (2) to rotate.

2. A microwave sensor according to claim 1, characterized in that: The controller instructs the rotating shaft assembly (2) to stop when the strength value of the real-time level signal received by the controller is equal to or higher than the standard level signal strength value.

3. A microwave sensor according to claim 2, characterized in that: It also comprises a base (1) and a shell (4), wherein the base (1) is mounted on a building, and the sensor element (5) and the controller are mounted on the base (1) via the rotating shaft assembly (2), and the shell (4) is buckled on the base (1); the base (1) and the shell (4) are both made of copper, and the shell (4) is provided with a microwave directional transceiver port.

4. A microwave sensor according to claim 3, characterized in that: It also includes an outer cover, which is detachably buckled on the microwave directional transceiver port.

5. A microwave sensor according to claim 3, characterized in that The inner wall surface of the outer shell (4) is covered with a sound-absorbing layer, and the sound-absorbing layer is made of sound-insulating cotton.

6. A microwave sensor according to claim 3, characterized in that The rotating shaft assembly (2) comprises a rotating part and a telescopic rod (3); the rotating part is connected to the base (1) via the telescopic rod (3); the sensor element (5) and the controller are both mounted on the rotating part; and the telescopic rod (3) and the rotating part are both electrically connected to the controller.

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