CN211042476U - Knocking detection device and household appliance with same - Google Patents

Abstract

The utility model relates to a strike detection device and a domestic appliance who has and strike detection device. An object of the utility model is to provide a detection device knocks that sensitivity is high, simple structure, easily make. According to the utility model discloses a strike detection device has: a piezoelectric sensor; the piezoelectric sensor is arranged on the side, which is open, of the shell, and the shell is closed by the piezoelectric sensor, so that the shell and the piezoelectric sensor form a cavity structure together, and one or more sound pickup holes are formed in the shell; and the signal processing unit is electrically connected with the piezoelectric sensor through a signal outgoing line. The utility model discloses still relate to one kind and include strike detection device's domestic appliance, strike detection device and be used for detecting to the domestic appliance panel strike and lean on arranging in with the face that has the sound pickup hole of its casing the dorsal part of domestic appliance panel. The sensitivity is improved while still maintaining the overall construction of the knock detection apparatus simple and easy to manufacture.

Description

Knocking detection device and household appliance with same

Technical Field

The utility model relates to a strike detection device and a domestic appliance who has and strike detection device.

Background

At present, household appliances are generally opened by a door handle. Along with the social development, people put higher demands on the aesthetic property and the usability of household appliances, and meanwhile, door handles of the household appliances such as refrigerators, washing machines and the like are parts contacted by users at high frequency, so that dirt is easily stored and contained, and the sanitation condition is poor. Further, the user may pull the door hard without knowing that the door cannot be opened, resulting in damage to the door structure. Meanwhile, the integrated appearance design is easier to realize under the condition of no door handle, so that the door handle is more attractive.

The door opening is informed by knocking as a daily action of people. It is then conceivable to open the door of the household appliance by means of a tap. A method of detecting a vibration signal on a surface of a measured object by attaching a piezoelectric sensor to the surface of the measured object is known, however, when a panel of a household appliance is knocked, deformation of a piezoelectric sheet caused by the influence of the thickness and material of the panel is generally small, and thus an electric signal generated by the deformation is weak, resulting in low knocking detection sensitivity.

Chinese utility model patent CN203259247U discloses a micro-vibration detector, micro-vibration detector includes leading sensor and dead lever, leading sensor improves detectivity through welding a little steel ball of taking the spring on the piezoelectric patch. However, in the process of production, transportation and transportation, the spring is easy to be pulled and damaged, and is not beneficial to production management and control and transportation. The sensitivity of the scheme is influenced by a spring, a steel ball and welding, the reliability is low, and the vibration characteristic is unstable.

Chinese patent application CN103674351A discloses an external force detection device for detecting an external force acting on a piezoelectric plate, which includes a container, a support portion, an excitation electrode, another excitation electrode, an oscillation circuit, a movable electrode, a fixed electrode, a frequency information detection unit, and a conductor. When an external force is applied to the piezoelectric plate to cause flexure of the piezoelectric plate or a change in the degree of flexure of the piezoelectric plate, the distance between the movable electrode on the piezoelectric plate side and the fixed electrode opposite to the movable electrode changes, which causes a change in capacitance therebetween. The capacitance change and the degree of deflection of the piezoelectric plate or slight deformation of the piezoelectric plate are collected as changes in the oscillation frequency of the piezoelectric plate, whereby the external force acting on the piezoelectric plate is detected. However, the excitation circuit and the detection system of the scheme are relatively complex and high in cost.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a sensitivity is high, simple structure, easily make strike detection device and a domestic appliance who has such detection device that strikes.

According to the utility model discloses an aspect provides a strike detection device, strike detection device has: a piezoelectric sensor; the piezoelectric sensor is arranged on the side of the shell, and the shell is provided with one or more sound pickup holes; and the signal processing unit is electrically connected with the piezoelectric sensor through a signal outgoing line.

The utility model discloses in, with the piezoelectric sensor among the prior art with wait to detect that surface direct contact detects the stress applied to it on different places, the utility model discloses detect the air vibration in cavity structures that arouses by knocking, this air vibration arouses the piezoelectric sensor signal. According to the utility model discloses a piezoelectric sensor does not with wait to detect surperficial direct contact, therefore does not receive the influence of waiting to detect the characteristic (for example thickness, material) of material self, also does not receive its humidity, presses pressure size etc. and influences, consequently strike detection device and can comparatively extensively be applicable to waiting of various materials and detect the surface.

According to the utility model discloses, semi-enclosed casing utilizes piezoelectric sensor to seal in its open one side, thereby casing and piezoelectric sensor constitute a cavity structures jointly. According to the utility model discloses, semi-enclosed expression the casing opens in one side. And the piezoelectric sensor is configured to close the open side. The housing and the piezoelectric sensor together form a cavity structure. According to the utility model discloses be equipped with one or more sound collecting hole on the casing. This means that the housing surface is provided with a sound pick-up hole in addition to the piezoelectric transducer. The pick-up hole is in direct or indirect contact with the surface to be detected when in use and is used for collecting knocking on the surface to be detected. The sound pick-up aperture is understood to be an opening provided in the housing for conducting sound. The pick-up hole may be located on a surface of the housing opposite and/or adjacent the piezoelectric transducer or in other positional relationship spaced from the piezoelectric transducer. When utilizing according to the utility model discloses a strike detection device and examine time measuring, strike the sound wave that produces and spread into cavity structures through the pickup hole in, arouse the air vibration in the cavity structures to can utilize piezoelectric sensor to detect air vibration. The chamber structure with the sound pickup opening can correspond to a helmholtz resonator. In order to optimize the detection effect, the natural frequency of the cavity structure can be adjusted by changing the shape and size of the sound pickup hole and/or the volume of the cavity structure, so that the air vibration caused by knocking generates resonance in the cavity structure, and the amplitude of the applied piezoelectric sensor surface is sharply increased, thereby increasing the amplitude of the piezoelectric signal generated by the piezoelectric sensor. This allows even a weak vibration to be detected, whereby the inspection sensitivity of the piezoelectric sensor is improved. And it can be said that the utility model discloses a strike detection device's unique structural design and amplify piezoelectric sensor's piezoelectric signal, can also save analog and/or digital amplifier circuit in the signal processing unit from this to further reduce the complexity of communication detection device and reduce manufacturing cost.

In the context of the present invention, the signal processing unit can be implemented not only as an analog circuit, for example a comparator circuit, an arithmetic circuit, etc., but also as a digital circuit, for example an integrated circuit, a system on a chip, a programmable logic element or a field programmable gate array with a microprocessor. The signal processing unit is electrically connected to the piezoelectric sensor via a signal outlet in order to evaluate the electrical signal of the piezoelectric sensor in the signal processing unit and preferably to detect whether a tap is present, on the basis of which a corresponding response, for example a corresponding operation, such as opening a door of the household appliance, can be carried out.

According to the utility model discloses a strike detection device detects the air vibration in cavity structures caused by strikeing with the help of piezoelectric sensor, can abandon from this and detect the deformation that detects the detection surface like utilizing piezoelectric sensor among the prior art. Through the utility model discloses a design, can realize knocking the detection with high sensitivity. Different material types of surfaces to be detected can be used due to the high sensitivity. Moreover, the sensitivity is improved while still keeping the overall structure of the tap detection device simple and easy to manufacture.

In particular, such a knock detection device can be designed modularly, mass-produced in a simple and low-cost manner, and installed as a module integrally into a household appliance, thereby having high consistency, stability and reliability. In this case, a plurality of modules formed by the impact detection device can also be combined with one another. For example, a plurality of the tap detection devices are arranged in a line, and thus configured as a unit that can detect taps at a plurality of different positions, respectively.

In addition, the circuit design of the signal processing unit can also realize the identification of the knocking with different strengths, thereby further improving the identification effect and the user experience. Optionally, the tap detection device may also identify at least one of the following taps on the household appliance panel on which it rests: single-contact tapping, multi-contact tapping, single tapping, multiple tapping, specific beat tapping.

Preferably, the housing is closed by the piezoelectric sensor, for example, by gluing, crimping, snapping, welding, etc., so that the two come into contact in an airtight manner, i.e., without an air gap to the outside environment.

According to an embodiment of the present invention, the piezoelectric sensor may be made of a sheet-shaped or film-shaped piezoelectric material such as a piezoelectric ceramic sheet or a piezoelectric film. Here, the piezoelectric sensor may be square, rectangular, parallelogram, circular, oval, triangular or irregular. Furthermore, the piezoelectric sensor has a corresponding shape and size to the cross section of the open side of the housing for jointly forming a cavity structure.

According to the utility model discloses an embodiment, the casing constitution is cylinder, oval cylinder, prism, cone, truncated cone, pyramid, truncated pyramid, square, cuboid or irregular spatial structure. The housing is shaped in such a way that at least one flat surface of the housing can be placed against the rear side of the surface to be examined. The shape of the housing can be adapted to the interior of the household appliance having the surface to be detected.

According to the utility model discloses an embodiment, the pick-up hole constitutes for square, rectangle, parallelogram, circular, oval, triangle-shaped or irregularly shaped. In addition, the dimensions of the pick-up holes can be selected differently, and the particular requirements for knock detection can be adapted by this flexible design.

Preferably, when there are multiple pick-up holes on the housing, the multiple pick-up holes are provided on the same surface or on different surfaces of the housing, so as to enable detection at different tapping positions.

According to the utility model discloses an embodiment, strike detection device and still have preceding interlayer, preceding interlayer is located the face that has the pickup hole of casing and has with the interlayer opening that pickup hole corresponds. The corresponding opening of the partition means that the opening of the front partition is approximately the same as the size and shape of the sound pickup hole and overlaps with each other in position, so that the sound waves pass through the sound pickup hole without attenuation and are transmitted into the cavity structure. On one hand, the front interlayer can isolate the noise of the external environment and the interference of the vibration of the surface to be detected on the sensor in a physical mode, so that the false recognition can be avoided, and the recognition accuracy is improved. It is emphasized that "ambient environment" is to be understood in the scope of the present application as the atmospheric environment, i.e. the sound field, in which the entire tap detection device is located. On the other hand, the front interlayer can reduce the physical damage to the knocking detection device caused by knocking exceeding the specified range.

Preferably, the front interlayer is made of foam or double-sided adhesive. The casing and the surface to be detected by knocking are generally made of rigid materials, in a direct contact connection mode, noise of the external environment may be captured by the sound pickup hole due to a gap between rigid bodies, and/or a knocking signal to be detected is lost or attenuated through a gap, and a collision may be caused by the gap, which may also cause interference noise, so that the casing and the surface to be detected preferably play a role in reducing sound leakage and isolating vibration between a surface with a sound pickup hole and the surface to be detected so as to guarantee the sensitivity and accuracy of detection. Particularly, the front interlayer formed by the double-sided adhesive tape can bond the shell and the surface to be detected together while insulating sound and vibration, so that other connecting measures between the knocking detection device and the surface to be detected can be omitted.

According to an embodiment of the invention, the housing and/or the front compartment has an air guide groove communicating the sound pickup hole with the atmosphere. When the surface to be detected is subjected to knocking detection, the knocking detection device is arranged on the back side of the surface to be detected, and the surface to be detected and the knocking detection device form an approximately closed cavity structure. However, thermal expansion of the air inside the closed cavity structure may be caused, for example, by temperature changes in the external environment or by temperature increases in the operation inside the household appliance, thereby changing the stress on the surface of the piezoelectric sensor, which may lead to a decrease in sensitivity. In order to prevent detection errors caused by the stress, an air guide groove can be arranged on the shell and/or the front interlayer of the knocking sensor, and the air guide groove is designed to enable the sound pickup hole to be communicated with the atmosphere, so that the detection errors caused by the change of the air pressure in the cavity structure are avoided. In this case, the air-guiding groove is preferably provided in the front baffle, and furthermore, an air-guiding groove can be provided on the chamber structure.

Furthermore, according to the utility model discloses an embodiment, strike detection device and still have the back interlayer, the back interlayer sets up on one side of piezoelectric sensor's the cavity structure that faces away from. The rear layer covers the piezoelectric sensor on the rear side (i.e. not the layer for detecting air vibrations) and is preferably connected to the housing. The rear partition may be an extension of the housing or an assembly of the signal processing unit, or may be a separate component. On one hand, the rear interlayer can isolate noise interference on the back side of the piezoelectric sensor, and detection accuracy is improved. On the other hand, the rear interlayer can be used as a rear cover of the knocking detection device, so that the pollution of dust in the external environment is avoided, and the protection effect is achieved. Preferably, the rear interlayer is made of pouring sealant, three-proofing paint or foam.

According to an embodiment of the present invention, the signal processing unit is located between the piezoelectric sensor and the rear partition layer or is separately located outside the rear partition layer from the housing. It goes without saying that the signal processing unit is arranged in connection with the housing on the side facing away from the cavity structure or outside the housing separately from the housing without the rear partition.

The utility model discloses an on the other hand still relates to one kind and includes above the household appliance who strikes detection device, strike detection device and be used for detecting the striking to the household appliance panel, strike detection device and lean on arranging in with the face that has the sound picking hole of its casing the dorsal part of household appliance panel. Wherein the area where the household appliance interacts with the user is defined as the front side of the household appliance panel and the side facing away from the user in use is defined as the back side of the household appliance panel.

According to the utility model discloses an embodiment, strike detection device with the dorsal part of domestic appliance panel is connected through pressing from both sides tight, buckle connection, threaded connection, bonding, riveting, welded mode. Preferably, the panel hugs closely in knocking the face that has the sound picking-up hole in the detection device to realize knocking the good leakproofness of detection device, this on the one hand can reduce the decay of the sound of knocking in the in-process that spreads into to knocking detection device, on the other hand can reach the effect of dampproofing, waterproof, dustproof, grease proofing and anticreep etc. from this.

According to the utility model discloses an embodiment, strike following at least one kind of hitting of domestic appliance panel of detection device discernment: single-contact tapping, multi-contact tapping, single tapping, multiple tapping, specific beat tapping.

It is to be noted that the touch object for performing the tapping is also of a wide variety of types, for example the touch object may relate to a plurality of different types of objects, for example a human body such as a finger (including a finger with a glove); non-conductive objects, such as plastic objects or wood products; or a conductive object such as a metal rod or the like. Wherein the single-contact tap represents that a touch object (a hand or other object) taps the face of the detection device with the sound pickup hole at one point on the panel. The multi-contact knocking represents that the touch body knocks the surface of the detection device with the sound pickup holes at a plurality of points on the panel. The single knocking represents that the touch body only knocks the surface, provided with the sound pickup hole, of the detection device once in a certain time period, and the multiple knocking represents that the touch body knocks the surface, provided with the sound pickup hole, of the detection device more than once in a certain time period. The specific beat strokes represent that the touch object strikes the surface of the detection device with the sound pickup aperture several times in a specific time interval within a certain time period, for example, first a short time interval and then a long time interval between three consecutive strokes. The above-described tapping modes may be implemented individually and/or in combination with one another for achieving different responses. The manufacturer or the user can define the corresponding response according to different tapping modes, for example, a single-contact tapping can realize opening the door of the household appliance, and a double single-contact tapping can realize re-closing the door of the household appliance. Thus, the home appliance does not need a door handle, thereby improving the aesthetic appearance and the ease of use of the home appliance.

According to the utility model discloses an implementation mode, domestic appliance is lampblack absorber, refrigerator, oven, food processor, washing machine, intelligent tap or intelligent closestool etc..

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention in which:

fig. 1 shows a cross-sectional view of a first embodiment of a strike detection device in accordance with the invention;

fig. 2 shows a cross-sectional view of a second embodiment of a tap detection device according to the invention;

fig. 3 shows a cross-sectional view of a third embodiment of a tap detection device according to the invention;

fig. 4 shows a cross-sectional view of a fourth embodiment of a tap detection device according to the invention;

fig. 5 shows a cross-sectional view of a fifth embodiment of a tap detection device according to the invention;

fig. 6 shows a cross-sectional view of a sixth embodiment of a tap detection device according to the invention;

fig. 7 shows a cross-sectional view of a seventh embodiment of a tap detection device according to the invention;

fig. 8 shows a cross-sectional view of an eighth embodiment of a tap detection device according to the invention;

FIG. 9 shows a top view of a front compartment for a tap detection apparatus;

FIG. 10 shows a top view of a housing of the tap detection apparatus;

fig. 11 shows a cross-sectional view of a ninth embodiment of a tap detection apparatus according to the invention;

fig. 12 shows a cross-sectional view of a tenth embodiment of a tap detection device according to the invention;

fig. 13 shows, in a sectional view, the application of a knock detection device to the panel of a household appliance.

Detailed Description

As an introduction, it is first explained that: in the various embodiments described in the different figures, identical components are provided with the same reference numerals or the same component names, wherein the disclosure contained throughout the description can be transferred in a meaningful manner to identical components provided with the same reference numerals or the same component names.

Fig. 1 shows a cross-sectional view of a first embodiment of a strike detection device in accordance with the invention. The tap detection device includes: a piezoelectric sensor 1; a semi-closed housing 2, wherein the housing 2 is closed at an open side thereof by the piezoelectric sensor 1, so that the housing 2 and the piezoelectric sensor 1 together form a cavity structure, wherein a sound pickup hole 21 is provided on the housing 2; and the signal processing unit 3 is electrically connected with the piezoelectric sensor 1 through a signal leading-out wire 11. As can be seen from fig. 1, the piezoelectric sensor 1 has a corresponding cross-sectional shape to the open side of the housing 2.

The housing 2 can be sealed by the piezoelectric sensor 1, for example, by gluing, crimping, clamping, welding, etc., so that they are in a gas-tight contact, i.e., there is no air gap to the outside environment. The piezoelectric sensor 1 may be made of a sheet-like or film-like piezoelectric material. The sound wave caused by the knocking is transmitted into the cavity structure through the sound pickup hole 21, so that the air in the cavity structure vibrates, and the air vibration can be detected by using the piezoelectric sensor 1, thereby realizing the detection of the knocking.

The piezoelectric sensor 1 shown in fig. 1 is circular, but it may also have other shapes, such as square, rectangular, parallelogram, oval, triangular or irregular. In the present embodiment, the sound pickup hole 21 is provided on a surface of the housing 2 opposite to the piezoelectric sensor 1, and the signal processing unit 3 is separated from the housing 2 and located outside the housing 2. In fig. 1, the size and position of the signal processing unit 3 are only schematically shown, but it may also be provided at any position, such as integrated into a lighting circuit of a panel or a control circuit of a household appliance. Although fig. 1 shows only one pickup hole 21, a plurality of pickup holes 21 may be provided, and these pickup holes 21 may be provided on the same surface or different surfaces of the housing 2.

Fig. 2 shows a sectional view of a second embodiment of the impact detection device, which differs from fig. 1 in that the signal processing unit 3 is arranged in connection with the housing 2 on the side facing away from the chamber structure. Preferably, the signal processing unit 3 has a cross-sectional shape corresponding to the opened side of the housing 2. In this case, the signal processing unit 3 additionally closes the rear side of the piezoelectric sensor 1, so that noise from the environment is reduced. Furthermore, the signal processing unit 3 is also integrated with the housing 2, so that the knock detection device is modularized. This is more advantageous for the assembly of the knock detection device in a household appliance.

Fig. 3 to 5 show sectional views of third to fifth embodiments of a strike detection device according to the invention, respectively. The pickup hole 21 in the tap detection device shown in fig. 3 has the same sectional size as the piezoelectric sensor 1. In this embodiment, a sound pickup aperture 21 is realized which is as large as possible. The sound pickup opening 21 can be designed in size and shape according to the specific detection requirements. For example, the sound pickup hole 21 may be formed in a square shape, a rectangular shape, a parallelogram shape, a circular shape, an oval shape, a triangular shape, or an irregular shape. Fig. 4 shows the sound pickup hole 21 in the tap detection device on the face of the housing 2 adjacent to the tap sensor 1. In the embodiment shown in fig. 5, the cavity structure formed by the housing 2 together with the piezoelectric sensor 1 has a triangular cross section. Here, the knock detection means may be a cone or a pyramid. The surface of the housing where the sound pickup hole 21 is located may be a flat surface or a curved surface. Alternatively, the housing 2 may also be configured as a cylinder, an elliptical cylinder, a prism, a truncated cone, a truncated pyramid, a cube, a cuboid or an irregular solid structure. Although only one pick-up hole 21 is shown here, it is also conceivable to provide a plurality of pick-up holes 21, which pick-up holes 21 can be provided on the same surface or on different surfaces of the housing 2.

Fig. 6 shows a sectional view of a sixth embodiment of the tap detection means. In contrast to the impact detection device shown in fig. 2, a front barrier layer 4 and a rear barrier layer 5 are additionally shown in fig. 6. The front partition 4 is located on the face of the housing 2 having the sound pickup aperture 21 and has a partition opening 41 corresponding to the sound pickup aperture 21. The opening 41 of the front partition 4 and the sound pickup hole 21 have substantially the same size and shape and overlap each other in position, so that the sound wave passes through the sound pickup hole 21 without attenuation and is transmitted into the cavity structure. On one hand, the front interlayer 4 can isolate the noise of the external environment in a physical mode, so that the false recognition can be avoided, and the recognition effect is improved. On the other hand, the front interlayer 4 can reduce physical damage to the knock detection device caused by a knock exceeding a specified range.

The front interlayer 4 is preferably made of foam or double-sided adhesive. The front interlayer 4 formed by foam or double faced adhesive tape can effectively reduce sound leakage and generate vibration isolation, thereby improving the sensitivity and accuracy of the knocking detection device. Particularly, the front interlayer 4 formed by the double-sided adhesive tape can bond the shell 2 and a panel to be knocked and detected together while insulating sound and vibration, so that other connecting measures between the knocking detection device and the surface to be detected can be omitted.

The rear interlayer 5 is arranged on one side of the piezoelectric sensor 1, which faces away from the cavity structure. The noise interference on the back side of the piezoelectric sensor 1 can be isolated by using the rear interlayer 5, and the sensitivity of the piezoelectric sensor 1 is improved. In addition, the rear interlayer 5 can play a role in moisture resistance, water resistance, dust resistance, oil resistance and electric leakage resistance as a rear cover of the knocking detection device. Preferably, the rear interlayer is made of pouring sealant, three-proofing paint or foam. In the present embodiment, the signal processing unit 3 is located between the piezoelectric sensor 2 and the rear barrier 5, thereby protecting the signal processing unit 3 while isolating sound and vibration.

Fig. 7 shows a sectional view of a seventh embodiment of the tap detection means similar to fig. 6. In contrast, the signal processing unit 3 is located outside the rear partition 5 separately from the housing 2.

Fig. 8 shows a sectional view of an eighth embodiment of a tap detection device according to the invention. In the case of the impact detection device shown in fig. 8, the rear wall 5 is no longer a separate component, but rather rests against the rear side of the signal processing unit 3, preferably as an assembly of the signal processing unit 3. In the present embodiment, the front barrier layer 4 is not provided. However, it is also possible to provide only the front barrier layer 4 and not the rear barrier layer 5 or to provide both the front barrier layer 4 and the rear barrier layer 5.

Fig. 9 shows a plan view of the front compartment 4 of the impact detection device. A compartment opening 41 is provided in the front compartment 4 corresponding to the pick-up aperture 21, i.e. both preferably have the same size and shape. The barrier openings 41 shown in fig. 9 have a circular shape, however other geometries such as square, rectangular, parallelogram, oval, triangular or irregular shapes may also be used. Here, the front partition 4 further has an air guide groove 42 for communicating the sound pickup hole with the atmosphere, thereby preventing detection errors due to changes in air pressure inside the cavity structure.

Fig. 10 shows a plan view of the housing 2 of the impact detection device. The housing 2 is also provided with air-guiding grooves 22, similar to those in the diaphragm openings 41, which air-guiding grooves 22 also prevent stresses in the piezoelectric sensor due to the expansion of air in the chamber structure caused by thermal expansion. The air-guiding groove 22 can also be designed as an air-guiding hole.

Fig. 11 shows a sectional view of a ninth embodiment of a tap detection device according to the invention. Fig. 11 shows a sectional view of a knocking detection device with air guide grooves 22 on the surface of the housing 2. In this case, alternatively or in addition to the air guide groove 42 in the front compartment 4, an air guide groove 22 is provided on the surface of the housing having the sound pickup opening 21, said air guide groove 42 serving to connect the sound pickup opening to the atmosphere.

Fig. 12 shows a cross-sectional view of a tenth embodiment of a tap detection device according to the invention. The housing 2 shown in fig. 12 is provided with three pick-up openings 21, 21', 21 ". These three pickup holes are provided on the surface of the case 2 opposed to the piezoelectric sensor 1, respectively. Here, fig. 12 shows that three pickup holes are sequentially arranged on one diameter of the housing 2. However, other numbers of pickup holes or other arrangements of pickup holes are also contemplated. It is also conceivable to combine a plurality of bridging detection means into one assembly. Furthermore, optionally, at least one of the following types of taps can also be identified by the tap detection device: single-contact tapping, multi-contact tapping, single tapping, multiple tapping, specific beat tapping, and the like.

Fig. 13 shows, in a sectional view, the application of a knock detection device to the panel of a household appliance. The striking detection device is arranged with the surface of its housing with the sound pickup opening 21 against the rear side of the household appliance panel 6 for detecting a striking on the household appliance panel 6. In the present embodiment, the front compartment 4 is in contact with the household appliance panel 6. The knocking detection device and the household appliance panel 6 can be connected in a clamping, buckling, spring, threaded, bonding, riveting and welding mode. The household appliance can be a range hood, a refrigerator, an oven, a food processor, a washing machine, an intelligent faucet or an intelligent closestool.

The present invention is not limited to the embodiments shown but includes or extends to all technical equivalents that may fall within the scope and spirit of the appended claims. The positional references selected in the description, such as, for example, upper, lower, left, right, etc., refer to the direct description and to the illustrated drawings and can be transferred to new positions in the event of a change in position.

The features disclosed in the present document can be essential for the implementation of the embodiments in terms of different embodiments and can be implemented both individually and in any combination.

Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make possible changes and modifications to the technical solution of the present invention by using the method and technical contents disclosed above without departing from the spirit and scope of the present invention, and therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention are within the protection scope of the technical solution of the present invention.

Claims (15)

1. Strike detection device, its characterized in that strikes detection device has:

-a piezoelectric sensor (1);

-a semi-enclosed housing (2), said housing (2) being enclosed on its open side by the piezoelectric transducer, whereby said housing (2) together with the piezoelectric transducer (1) forms a cavity structure, wherein one or more sound pick-up holes (21) are provided in said housing;

-a signal processing unit (3), the signal processing unit (3) being electrically connected with the piezoelectric sensor (1) by a signal outlet (11).

2. The impact detection device according to claim 1, characterized in that the piezoelectric sensor (1) is made of a sheet-like or film-like piezoelectric material and/or is configured as a square, a rectangle, a parallelogram, a circle, an ellipse or a triangle.

3. The impact detection device according to claim 1, wherein the housing (2) is configured as a cylinder, an elliptical cylinder, a prism, a cone, a truncated cone, a pyramid, a truncated pyramid, a cube or a cuboid.

4. Tap detection device according to claim 1, characterised in that the pick-up hole (21) is configured as a square, rectangle, parallelogram, circle, ellipse or triangle.

5. The tap detection apparatus of claim 1 wherein when a plurality of pick-up holes are present in the housing, the plurality of pick-up holes are disposed on the same surface or different surfaces of the housing.

6. Tap detection device according to one of claims 1 to 5, characterised in that it further has a front compartment (4), said front compartment (4) being located on the face of the housing having the pick-up aperture (21) and having a compartment opening (41) corresponding to said pick-up aperture (21).

7. Tap detection device according to claim 6, characterised in that the front compartment (4) consists of foam or double-sided adhesive.

8. Tap detection device according to claim 7, characterised in that the housing (2) and/or the front compartment (4) has/have an air guide groove (22, 42) for venting the sound pick-up opening to the atmosphere.

9. Tap detection device according to one of claims 1 to 5, characterised in that it further has a rear spacer (5), said rear spacer (5) being arranged on the side of the piezoelectric sensor (1) facing away from the cavity structure.

10. The knock detection device according to claim 9, wherein the rear barrier (5) is made of potting compound, three-proofing paint or foam.

11. Tap detection device according to claim 9, characterised in that the signal processing unit (3) is located between the piezoelectric sensor (1) and the rear compartment (5) or outside the rear compartment (5) separately from the housing (2).

12. Household appliance comprising a tap detection device according to one of claims 1 to 11 for detecting a tap on a panel of the household appliance, the tap detection device being placed with a face of its housing with a pick-up hole (21) against the back side of the panel of the household appliance.

13. Household appliance according to claim 12, characterized in that the tapping detection means are connected to the back side of the household appliance panel by clamping, snap-in connection, screwing, gluing, riveting or welding.

14. Household appliance according to claim 12 or 13, wherein said tapping detection means identify at least one of the following taps on the panel of the household appliance: single-contact tapping, multi-contact tapping, single tapping, multiple tapping, tapping with a beat.

15. The household appliance according to claim 12 or 13, wherein the household appliance is a range hood, a refrigerator, an oven, a food processor, a washing machine, an intelligent faucet or an intelligent toilet.

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