Automatic flushing device based on piezoelectric ceramics

Abstract

The utility model provides an automatic flushing device based on piezoelectric ceramics, which comprises a water tank and a pit slot, the pit slot is arranged below the water tank, the bottom of the water tank is sequentially connected with an electromagnetic valve and the water inlet end of a water pipe, the water outlet end of the water pipe is connected with the pit slot, the pit slot is provided with a piezoelectric module, and the piezoelectric module is electrically connected with the electromagnetic valve. The piezoelectric module comprises an upper protective layer, piezoelectric ceramic and a lower protective layer which are sequentially arranged from top to bottom, the piezoelectric ceramic is electrically connected with the signal module, and the signal module is electrically connected with the electromagnetic valve through a signal transmission line. Through cooperation of all parts, piezoelectric signals generated when a toilet user stands on the piezoelectric module and the time difference between two piezoelectric signals generated when the toilet user squats down and stands up are obtained, the purpose of automatic flushing is achieved, the purpose of controlling the water amount is achieved according to the time needed for the two signals to appear, the use convenience is improved, and the practicability is high. Meanwhile, the waste of water resources is also avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of flushing devices, and in particular to an automatic flushing device based on piezoelectric ceramics. Background Art

[0002] Automatic toilet flushing primarily detects when a user leaves the toilet and automatically flushes the toilet, then shuts off after a period of time, eliminating the need for the user to manually trigger the flush. Traditional flushing systems primarily utilize infrared reflection. When a user uses the toilet, infrared light from an infrared transmitter is reflected by the body and reaches an infrared receiver. This signal is then processed and controls a solenoid valve to open and release the water. When the user leaves, the infrared light is no longer reflected, and the solenoid valve automatically closes.

[0003] In actual operation, infrared sensors may trigger falsely due to misjudging ambient heat. For example, this can cause unnecessary flushing when other heat sources pass by. Infrared reflection is easily affected by the color and roughness of clothing, which can prevent the infrared light from being reflected by the infrared receiver, thus preventing the intended effect. Because infrared sensors are sensitive to heat and motion, sensitivity adjustment can be relatively difficult and requires adjustment based on the specific usage environment to avoid false triggering or slow response. Most infrared sensors require batteries, and prolonged use may limit battery life, requiring regular battery replacement or charging. Infrared sensor sensors must be kept clean to prevent accumulation of dust and dirt that may affect the sensing effect, requiring regular maintenance and cleaning. Environmental conditions such as temperature and strong light can affect the sensing effect of infrared sensors, requiring consideration of environmental factors during design and installation. Therefore, the market urgently needs an automatic flushing device that is less sensitive to the environment and more energy-efficient to address the above issues. Summary of the Invention

[0004] To address the aforementioned technical issues of existing automatic flushing devices being prone to false triggering or slow response, an automatic flushing device based on piezoelectric ceramics is provided. This design utilizes the pressure changes generated by the user on the piezoelectric module to detect the piezoelectric signal generated when the user stands on the piezoelectric module, as well as the time difference between the two piezoelectric signals generated when the user squats and then stands up, thereby achieving automatic flushing.

[0005] The technical means adopted in the present invention are as follows:

[0006] An automatic flushing device based on piezoelectric ceramics includes a water tank and a pit. The pit is arranged below the water tank. The bottom of the water tank is connected to a solenoid valve and the water inlet end of a water pipe in sequence. The water outlet end of the water pipe is connected to the pit. A piezoelectric module is arranged on the pit, and the piezoelectric module is electrically connected to the solenoid valve.

[0007] Furthermore, the piezoelectric module includes an upper protective layer, a piezoelectric ceramic, and a lower protective layer sequentially arranged from top to bottom. The piezoelectric ceramic is electrically connected to the signal module, and the signal module is electrically connected to the solenoid valve via a signal transmission line.

[0008] Furthermore, a toothed anti-slip strip is provided on the upper portion of the upper protective layer.

[0009] Furthermore, the piezoelectric ceramic generates a voltage signal when it is subjected to pressure and sends it to the signal module. After receiving the voltage signal, the signal module sends a signal to the solenoid valve according to the high and low levels.

[0010] Furthermore, the signal module collects the voltage signal generated by the piezoelectric ceramic and the time difference t between two pressure fluctuations caused by the phenomenon of super-weightlessness when a person squats. When the pressure applied to the piezoelectric ceramic is zero, the voltage signal disappears, and the signal module processes it as a high level, transmits it to the signal input terminal P0 of the control circuit, and converts this high level to a low level after it lasts for t time.

[0011] Furthermore, the piezoelectric ceramic adopts the Thevenin voltage equivalent model.

[0012] Furthermore, a water level detection device is provided on the inner wall of the water tank.

[0013] Furthermore, a control circuit is provided in the solenoid valve, which includes a 5V DC power supply, a 24V DC power supply, a field effect tube, a transistor, a diode, a solenoid valve, a resistor, a signal input terminal P0 and a grounding device. When the P0 output is a high level, the solenoid valve opens; when the P0 output is a low level, the solenoid valve closes.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] The present invention achieves automatic flushing by obtaining the time difference between the piezoelectric signal generated when the user stands on the piezoelectric module and the piezoelectric signal generated when the user squats and stands up through the coordination of various components. The time required for the two signals to appear is used to control the water volume, thereby improving convenience and avoiding water waste.

[0016] The solenoid valve of the present invention is controlled by a signal generated by the positive piezoelectricity of the piezoelectric ceramic, which saves electric energy. At the same time, the piezoelectric ceramic is in a protective layer and is less affected by external interference, resulting in a more stable effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 Schematic diagram of the structure of the piezoelectric module of the present invention;

[0020] Figure 3 It is a schematic structural diagram of the pit of the present invention;

[0021] Figure 4 Schematic diagram of signal processing of the piezoelectric ceramic of the present invention;

[0022] Figure 5 This is the control circuit of the solenoid valve of the present invention.

[0023] Description of reference numerals:

[0024] 1. Water tank; 2. Water level detection device; 3. Solenoid valve; 4. Water pipe; 5. Groove; 6. Piezoelectric module; 601. Anti-slip strip; 602. Upper protective layer; 603. Piezoelectric ceramics; 604. Lower protective layer; 605 Signal module; 7. Signal transmission line. DETAILED DESCRIPTION

[0025] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0026] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0027] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0028] Unless otherwise specifically stated, the relative arrangement of the parts and steps, the numerical expressions and the numerical values ​​described in these embodiments do not limit the scope of the present invention. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The techniques, methods and equipment known to ordinary technicians in the relevant fields may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, so once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0029] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention: the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0030] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below their position devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0031] like Figure 1 and 3 As shown, a flushing device based on piezoelectric ceramics includes a water tank 1 for storing water. A signal-controlled solenoid valve 3 is vertically connected to the bottom of the water tank 1. The solenoid valve 3 serves as a switch for controlling water and connects the water tank 1 and a water pipe 4. Water flows from the water tank 1, passes through the solenoid valve 3 and the water pipe 4, and reaches a pit 5. A piezoelectric module 6 located above the pit 5 is connected to the solenoid valve via a signal transmission line 7. The piezoelectric module 5 is characterized in that it can transmit a signal to the solenoid valve 3 according to the user's situation. The solenoid valve 3 completes the opening and closing of the water tank through a control circuit, thereby realizing the entire automatic flushing process.

[0032] As a preferred embodiment, a water level detection device 2 is provided on the inner wall of the water tank 1 of the automatic flushing device for accurately monitoring the water level in the water tank so that the system can replenish water according to actual needs.

[0033] like Figure 2 As shown, the piezoelectric module 6 is provided with a toothed anti-slip strip 601 , an upper protective layer 602 and a lower protective layer 601 for protecting the piezoelectric ceramic 603 , and a signal module 605 for collecting and processing piezoelectric signals.

[0034] like Figure 4 As shown, the signal module 605 collects the voltage signal generated by the piezoelectric ceramic 603 and the time difference t between two pressure fluctuations caused by the super-weightlessness phenomenon when a person squats. When the pressure applied to the piezoelectric ceramic drops to zero, the voltage signal disappears. The signal module uses the falling edge to trigger a high level, which is transmitted to the signal input terminal P0 of the control circuit. This high level lasts for t seconds and then turns to a low level.

[0035] The piezoelectric ceramic 603 adopts the Thevenin voltage equivalent model.

[0036] like Figure 5As shown, the control circuit of solenoid valve 3 includes a 5V DC power supply, a 24V DC power supply, a field-effect transistor, a transistor, a diode, a solenoid valve, a resistor, a signal input terminal P0, and a grounding device. When the output of P0 is high, the solenoid valve opens; when the output of P0 is low, the solenoid valve closes.

[0037] The present invention provides an automatic flushing device based on piezoelectric ceramics. This device converts the pressure generated by a person standing on the piezoelectric ceramic into a pressure signal across the ceramic. The time difference between the pressure change and the voltage fluctuation generated when the person squats and stands up provides a driving signal for a solenoid valve, which controls the operation of the water tank switch and achieves the automatic flushing process. By utilizing the positive piezoelectricity of the piezoelectric ceramics to convert mechanical energy into electrical energy and use this electrical energy as a control signal, the present invention reduces the power cost of the automatic flushing device. Furthermore, the time difference between squatting and standing up is used to control the water flow, conserving water resources.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An automatic flushing device based on piezoelectric ceramics, characterized in that: The invention comprises a water tank (1) and a pit (5), wherein the pit (5) is arranged below the water tank (1), the bottom of the water tank (1) is connected to a solenoid valve (3) and a water inlet end of a water pipe (4) in sequence, the water outlet end of the water pipe (4) is connected to the pit (5), a piezoelectric module (6) is arranged on the pit (5), and the piezoelectric module (6) is electrically connected to the solenoid valve (3).

2. The automatic flushing device based on piezoelectric ceramics according to claim 1, characterized in that: The piezoelectric module (6) comprises an upper protective layer (602), a piezoelectric ceramic (603) and a lower protective layer (604) arranged in sequence from top to bottom; the piezoelectric ceramic (603) is electrically connected to a signal module (605); and the signal module (605) is electrically connected to a solenoid valve (3) via a signal transmission line (7).

3. The automatic flushing device based on piezoelectric ceramics according to claim 2, characterized in that: A toothed anti-slip strip (601) is provided on the upper portion of the upper protective layer (602).

4. The automatic flushing device based on piezoelectric ceramics according to claim 2, characterized in that: When the piezoelectric ceramic (603) is subjected to pressure, a voltage signal is generated and sent to the signal module (605). After receiving the voltage signal, the signal module (605) sends a signal to the solenoid valve (3) according to the high and low levels.

5. The automatic flushing device based on piezoelectric ceramics according to claim 4, characterized in that: The signal module (605) collects the voltage signal generated by the piezoelectric ceramic (603) and the time difference t between two pressure fluctuations generated by the super-weightlessness phenomenon when a person squats. When the pressure applied to the piezoelectric ceramic (603) is zero, the voltage signal disappears, and the signal module (605) processes it into a high level, transmits it to the signal input terminal P0 of the control circuit, and converts this high level to a low level after it lasts for t seconds.

6. The automatic flushing device based on piezoelectric ceramics according to claim 2, characterized in that: The piezoelectric ceramic (603) adopts the Thevenin voltage equivalent model.

7. The automatic flushing device based on piezoelectric ceramics according to claim 1, characterized in that: A water level detection device (2) is provided on the inner wall of the water tank (1).

8. The automatic flushing device based on piezoelectric ceramics according to claim 5, characterized in that: The solenoid valve (3) is provided with a control circuit, which comprises a 5V DC power supply, a 24V DC power supply, a field effect tube, a triode, a diode, a solenoid valve (3), a resistor, a signal input terminal P0 and a grounding device. When the output of P0 is a high level, the solenoid valve (3) opens; when the output of P0 is a low level, the solenoid valve (3) closes.

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