CN210894188U

CN210894188U - Mounting structure and water detector of detecting electrode

Info

Publication number: CN210894188U
Application number: CN201921399174.4U
Authority: CN
Inventors: 施镇乾
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-08-23
Filing date: 2019-08-23
Publication date: 2020-06-30
Anticipated expiration: 2029-08-23

Abstract

The utility model discloses a detecting electrode's mounting structure and water detector belongs to the check out test set field. The water detector comprises an insulating shell, a battery, a circuit board and four detection electrodes, wherein the insulating shell comprises four detection surfaces, the four detection electrodes are respectively embedded on connecting edges between the four detection surfaces, the four detection electrodes are grouped in pairs and are used for respectively connecting a signal line electrode and a power supply electrode, and the two detection electrodes positioned at opposite angles are connected with the same electrode; the battery and the circuit board are both arranged in the insulating shell. When any one detection surface is positioned on the plane, two detection electrodes with different polarities are always positioned on the plane, once the plane is provided with water, an internal circuit can be triggered, the water detection function is realized, and the performance is reliable; the utility model discloses a battery provides the power to install battery and circuit board inside insulating casing, compact structure, small uses the place many. The utility model also discloses a detecting electrode's mounting structure.

Description

Mounting structure and water detector of detecting electrode

Technical Field

The utility model relates to a check out test set field especially relates to a mounting structure and water detector of detecting electrode.

Background

In the life and work scenes of modern people, water leakage often occurs. Such as water leakage of a water dispenser, water leakage of a water pipe, water leakage of a roof and the like, the water leakage brings inconvenience to life and work of people, and the occurrence rate of serious potential safety hazards is increased along with the continuous improvement of the popularization rate of electric appliances in various places. The water detector is used for detecting and alarming various water leakage conditions, and the arrival of the water detector provides a guarantee for the life and work of people.

However, the water detector in the prior art is generally too large in volume, so that the use place of the water detector is limited, and particularly, the water detector cannot be placed at a narrow angle; in addition, the water detector in the prior art can only detect single side, and the detector cannot work normally if the detector turns over carelessly or is not positioned on a horizontal plane.

In view of the above, a new technical solution is urgently needed to solve the above technical problems.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a mounting structure of a detection electrode and a water detector using the same, which have the characteristics of miniaturization and more use places; any one of the four detection surfaces is positioned on the plane, so that the function of water detection can be realized, and the performance is reliable.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides an installation structure of detecting electrode, its includes insulating housing and four detecting electrodes, insulating housing includes four detection faces, four detecting electrodes bury underground respectively on the connection arris between four detection faces, and two liang of a set of four detecting electrodes, two sets of detecting electrodes are used for connecting signal line electrode and power electrode respectively, and two detecting electrodes that are located diagonal position all connect same electrode.

A water detector comprises an insulating shell, a battery, a circuit board and four detection electrodes, wherein the insulating shell comprises four detection surfaces, the four detection electrodes are respectively embedded on connecting edges among the four detection surfaces, a detection circuit is arranged on the circuit board, and the detection circuit comprises a signal line electrode and a power supply electrode; the four detection electrodes are grouped in pairs, two groups of detection electrodes are used for being respectively connected with the signal line electrode and the power supply electrode, and the two detection electrodes positioned at the diagonal positions are both connected with the same electrode; the battery and the circuit board are both arranged in the insulating shell.

As a further improvement, the insulating shell comprises an upper shell, a lower shell and a connecting shell, wherein the upper shell and the lower shell are respectively and fixedly connected to two ends of the connecting shell; the end of the upper shell far away from the connecting shell is closed, the end of the lower shell far away from the connecting shell is provided with an opening, and the opening is covered with a battery cover in a sealing mode.

As a further improvement, the cross sections of the upper shell and the lower shell are equal, the cross section of the connecting shell is smaller than that of the upper shell, and after assembly, a circle of siphon grooves are formed in the middle of the insulating shell. The siphon groove has the functions that: when one detection electrode senses water, a siphoning effect is generated, and the water is led to the other detection electrode on the same plane, so that the water detector is rapidly triggered to work; meanwhile, the inward-contracting structure of the siphon groove can prevent the detection electrode from touching other metals on the plane.

As a further improvement, the upper shell and the connecting shell, and the lower shell and the connecting shell are connected by an ultrasonic welding process; and a waterproof ring is arranged between the lower shell and the battery cover and is fixed through screws.

As a further improvement, the circuit board comprises a main circuit board and an auxiliary circuit board, and the main circuit board is electrically connected with the auxiliary circuit board; the main circuit board is installed in the upper shell, and the auxiliary circuit board is installed in the connecting shell.

As a further improvement, a negative spring is fixedly arranged on the inner side of the battery cover, the battery is arranged in the lower shell in an extruding way through the negative spring, the positive pole of the battery is connected to the auxiliary circuit board, and the negative pole of the battery is connected to the negative spring; the negative electrode spring is connected with one of the detection electrodes through a telescopic probe, so that the space is utilized to the maximum extent, the material consumption is saved, and the production cost is reduced; the four detection electrodes are all connected to the auxiliary circuit board.

As a further improvement, the four detection electrodes are four metal sheets, the connecting shell has four surfaces, and the four metal sheets are respectively embedded in connecting edges of any two surfaces.

As a further improvement, the circuit board includes an alarm module for issuing an alarm when water is detected.

As a further improvement, the alarm module is a buzzer.

As a further improvement, the circuit board further comprises a sending module, and the sending module is used for sending a control instruction to the water valve controller or sending detection information to a user.

Compared with the prior art, the utility model discloses following beneficial effect is brought:

the utility model discloses bury four detecting electrodes underground respectively on the connecting arris between four detection faces, when any detection face is located the plane, always have two not detecting electrodes of polarity to also be located this plane, once there is water in the plane can trigger circuit, realize the water detection function, the dependable performance; the utility model discloses a water detector adopts the battery to provide the power to install battery and circuit board inside insulating casing, compact structure, small uses the place to increase.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 shows an exploded perspective view of a preferred embodiment of the present invention;

fig. 2 shows a longitudinal cross-section of a preferred embodiment of the invention;

FIG. 3 shows a state diagram of the metal sheet of the present invention during the production process;

FIG. 4 shows a side view of the metal sheet of FIG. 3;

fig. 5 shows an electrical connection diagram of four metal sheets according to the present invention.

Description of the main element symbols:

1-upper shell; 2-a lower shell; 21-a wedge block; 3-connecting the shell; 31-a siphon groove; 4-a battery cover; 41-negative pole spring; 42-screw; 5-a battery; 61-main circuit board; 62-a secondary circuit board; 7-a metal sheet; 71-a welding column; 8-a probe; 10-waterproof ring.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

Examples

Referring to fig. 1 and 2, the present embodiment discloses a water detector, which includes an insulating housing, a battery 5, a circuit board and four detecting electrodes.

The insulation shell comprises four detection surfaces, the four detection electrodes are respectively embedded on connecting edges among the four detection surfaces, a detection circuit is arranged on the circuit board, and the detection circuit comprises a signal line electrode and a power supply electrode; the four detection electrodes are grouped in pairs, two groups of detection electrodes are used for being respectively connected with the signal line electrode and the power supply electrode, and the two detection electrodes positioned at diagonal positions are both connected with the same electrode, namely, one pair of detection electrodes positioned at the diagonal positions are connected, one pair of detection electrodes of the four detection electrodes is connected with the signal line electrode, and the other pair of detection electrodes is connected with the power supply electrode; the battery 5 and the circuit board are both arranged in the insulating shell.

Specifically, in this embodiment, the insulating housing includes an upper housing 1, a lower housing 2 and a connecting housing 3, where the upper housing 1 and the lower housing 2 are respectively and fixedly connected to two ends of the connecting housing 3; the end of the upper shell 1 far away from the connecting shell 3 is closed, and the end of the lower shell 2 far away from the connecting shell 3 is provided with an opening which is covered with a battery cover 4. The upper casing 1, the lower casing 2 and the connecting casing 3 are all internally provided with installation spaces for installing other components.

More specifically, the cross section of the upper shell 1, the cross section of the lower shell 2 and the cross section of the connecting shell 3 are square, the height of the upper shell 1 is equal to that of the lower shell 2, and the height of the connecting shell 3 is the minimum, so that the insulating shell formed by the upper shell 1 and the lower shell 2 is long and square, and the four side surfaces of the insulating shell are the four detection surfaces.

Preferably, in order to make the appearance of the whole water detector smoother and more beautiful, the connection edges between the surfaces of the insulating housing are rounded.

The insulating casing of this embodiment has four detection faces, even if touch the water detector carelessly and make it take place to roll, the water detector has always a detection face to paste in the plane for two detection electrodes that are located two different utmost points of this detection face are in the position that can normally work, and consequently, this water detector possesses the mechanism that the correspondence touches and rolls, and the fault-tolerant rate is higher.

Referring to fig. 2, as a preferred scheme, a circle of groove is formed in both the upper and lower end surfaces of the connecting shell 3, a circle of clamping edge is convexly formed on the end surface of the upper shell 1 connected to the connecting shell 3, and a circle of clamping edge is convexly formed on the end surface of the lower shell 2 connected to the connecting shell 3, when assembling, the clamping edges of the upper shell 1 and the lower shell 2 are respectively inserted into the groove of the connecting shell 3, so as to enhance the connection stability of the upper shell 1 and the lower shell, and enhance the waterproof performance of the insulating shell.

It should be noted that, in the present embodiment, the insulating housing is assembled by three parts along the longitudinal direction, but the insulating housing of the present invention is not limited thereto, and other assembling forms, for example, two parts are assembled along the longitudinal direction, or two parts are assembled along the transverse direction, may be adopted.

Referring to fig. 2, as a further improvement, the cross sections of the upper shell 1 and the lower shell 2 are equal, and the cross section of the connecting shell 3 is smaller than that of the upper shell 1, that is, the cross section of the connecting shell 3 is the smallest among the three shells, and the cross sections of the upper shell 1 and the lower shell 2 are equal. After assembly, a siphon groove 31 is formed in the middle of the insulating housing. The siphon groove 31 functions as: when one detection electrode senses water, a siphoning effect is generated, and the water is led to the other detection electrode on the same plane, so that the water detector is rapidly triggered to work; at the same time, the inward-contracting structure of siphon groove 31 can also prevent the detection electrode from touching other metals on the plane.

As a further improvement, the upper shell 1 and the connecting shell 3, and the lower shell 2 and the connecting shell 3 are connected by an ultrasonic welding process, and this connection is used to ensure that the whole insulating shell has excellent waterproof performance.

Specifically, in the present embodiment, the circuit board includes a main circuit board 61 and an auxiliary circuit board 62, and the main circuit board 61 and the auxiliary circuit board 62 are electrically connected; the main circuit board 61 is mounted in the upper case 1, and the sub circuit board 62 is mounted in the connection case 3. Specifically, the main circuit board 61 is inserted and fixed in the upper case 1, and the sub circuit board 62 is installed in the connection case 3 in a manner of being parallel to the cross section of the connection case 3, which maximizes the use of space, makes the entire water detector more compact, and is advantageous for miniaturization.

Specifically, in the present embodiment, a negative spring 41 is fixedly mounted on the inner side of the battery cover 4, the battery 5 is mounted in the lower case 2 by pressing the negative spring 41, the positive electrode of the battery 5 is connected to the auxiliary circuit board 62, and the negative electrode of the battery 5 is connected to the negative spring 41; the method comprises the following steps: the positive electrode of the battery 5 is inserted forward into the internal mounting space of the lower case 2, the negative electrode spring 41 of the battery cover 4 is pressed against the negative electrode of the battery 5, and the battery cover 4 is fixed to the end of the lower case 2 with two screws 42, thereby assembling the battery 5 in place.

The water detector is powered by the battery 5 without an external power supply, so that the use place of the water detector is greatly expanded and is not limited by a socket. Meanwhile, the battery 5, the main circuit board 61 and the auxiliary circuit board 62 are arranged in the insulating shell, and the water detector is compact in structure and small in size, so that the water detector can be placed in narrow places, and the application places of the water detector are enlarged.

More specifically, a wedge 21 is further provided in the lower case 2, the wedge 21 is fixedly mounted in a gap between the battery 5 and the lower case 2, and a through hole is provided in the wedge 21, the through hole extending in the longitudinal direction of the lower case 2. A telescopic probe 8 penetrates through the through hole, one end of the probe 8 is fixedly connected to one of the detection electrodes, and the other end of the probe 8 is elastically connected to the negative spring 41.

In the present embodiment, the negative electrode of the power supply is connected to one of the pair of probe electrodes, and the pair of probe electrodes is used as the power supply electrode; it is easily conceived that, in other embodiments, the positive electrode of the power supply may be connected to a pair of probe electrodes, and the pair of probe electrodes may be used as the power supply electrode.

Referring to fig. 3 and 4, in the present embodiment, the four detection electrodes are four metal sheets 7, the connecting shell 3 has four surfaces, and the four metal sheets 7 are respectively embedded on connecting edges of any two surfaces; the method comprises the following steps: four inserting holes are formed in four corners of the connecting shell 3, the size of each inserting hole is matched with the metal sheet 7, and the metal sheets 7 are inserted and fixed in the corresponding inserting holes. The four metal sheets 7 are coplanar with the plane of the connecting shell 3, and the four metal sheets 7 are exposed out of the outer surface of the connecting shell 3, and the exposed parts are flush with the outer surface of the connecting shell 3.

Referring to fig. 5, the four metal sheets 7 are respectively labeled as a detecting electrode a, a detecting electrode B, a detecting electrode C and a detecting electrode D, wherein the detecting electrode a and the detecting electrode C are connected to a power electrode, such as a negative electrode of a power supply; the detection electrode B is connected with the detection electrode D and is connected with the signal line electrode. Therefore, any two adjacent metal sheets 7 are different in polarity, when any detection surface is located on the plane, the two metal sheets 7 different in polarity are always located on the plane, once the plane is provided with water, a loop can be triggered, the water detection function is achieved, and the performance is reliable.

The specific implementation mode that the detection electrode A is connected with the detection electrode C and the detection electrode B is connected with the detection electrode D is as follows: the four metal sheets 7 are provided with welding posts 71, each welding post 71 extends towards one side of the auxiliary circuit board 62, and the welding posts 71 are welded on the auxiliary circuit board 62. Wherein, the welding post 71 of detecting electrode A and detecting electrode C is connected through the first line on the auxiliary circuit board 62, the welding post 71 of detecting electrode B and detecting electrode D is connected through the second line on the auxiliary circuit board 62, the first line is not connected with the second line, so far, four sheetmetals 7 realize the utility model discloses a special connection relation; wherein, the first circuit is connected with the base electrode of the PNP triode, and the base electrode through resistor is connected with a power supply (the positive electrode or the negative electrode of the power supply); the second line is connected with the signal line electrode.

Specifically, in this embodiment, the internal detection circuit of the water detector mainly utilizes the characteristic of the PNP triode to realize the detection of water leakage, specifically: when no water conducts the signal line electrode and the power supply electrode, the base electrode of the PNP triode is positioned at a high potential, and the triode is not triggered; when water is used as a medium to conduct the signal line electrode and the power supply electrode, the base electrode potential is pulled low, and the triode is triggered, so that the water detection function is realized. The above characteristics of the PNP transistor are conventional in the art, and the present embodiment will not be described in detail.

As a further improvement, the circuit board includes an alarm module, specifically, the alarm module is a buzzer, and the buzzer is mounted on the main circuit board 61. When the water detector detects water, the buzzer will be triggered and beep to remind the user to pay attention.

It should be noted that the alarm module is not limited to the buzzer of the embodiment, and may be other mechanisms, such as an alarm, a flashing light, and the like.

As a further improvement, the circuit board further comprises a sending module, wherein the sending module is used for sending a control instruction to the water valve controller so as to control the water valve to be opened or closed; or send detection information to the user. Specifically, the water valve controller can control the opening and closing of a water faucet and can also control the opening and closing of other water consuming appliances.

As a further improvement, a waterproof ring 10 is arranged between the battery cover 4 and the lower shell 2. Specifically, a groove is formed in the end surface of the lower case 2, and the waterproof ring 10 is sealed in a space formed by the groove and the inner side surface of the battery cover 4 by extrusion. Of course, the groove may be formed on the inner side surface of the battery cover 4, or both the fitting surfaces of the lower case 2 and the battery cover 4 may be formed with grooves.

Referring to fig. 1 and 2, the four metal sheets 7 in the present embodiment are assembled to be located in the same plane, which is the most convenient structure for installation and manufacture. Specifically, in the present embodiment, the four metal sheets 7 can be manufactured and installed in the following manner:

referring to fig. 3 and 4, a piece of hardware is selected and punched to obtain an X-shaped hardware. This X shape five metals piece includes four thin slices on four connection limits of a center circle, connection center circle and four connection limits, and a side of every thin slice extends to center circle direction and forms an extension limit, the extension limit is buckled to the planar direction in perpendicular to five metals piece place again and is formed the bending part, will at last center circle and connection limit are amputated can. The thin sheet is the metal sheet 7, and the bent portion is the welding column 71. The manufacturing process can obtain four metal sheets 7 at one time, and is favorable for improving the production efficiency.

During assembly, the four metal sheets 7 are correspondingly inserted into the connecting shell 3 which is provided with the inserting holes in advance, and the assembly can be completed.

It should be noted that the detecting electrode in this embodiment is the metal sheet 7, but according to the gist of the present invention, the detecting electrode is not limited to the metal sheet 7, and may be a metal block, a metal column, or the like. Moreover, the positions of the four detection electrodes are not limited to be located in the same plane, and two detection electrodes may be located in the same plane while each detection surface is attached to the same plane.

The working principle and the process of the water detector are described as follows:

when the water detector is used for detecting water leakage, the water detector is horizontally placed on the ground, at the moment, one detection surface of the water detector is attached to the ground, and meanwhile, the detection electrodes positioned on the two connecting edges of the detection surface are also attached to the ground. When having subaerial when leaking, two detecting electrode realize connecting through water, trigger the inside detection circuitry of water detector simultaneously to reach the purpose that leaks and detect. It is easy to understand that the shape of the water detector is a long strip square, even if the water detector is touched carelessly, the water detector rolls around the axis of the length direction of the water detector, and finally, a detection surface is bound to be attached to the ground, so that two detection electrodes are ensured to be positioned at the position where water leakage can be detected. It should be noted that the water leak detection is not limited to placement on the ground, but may be in other locations, such as a table, a window sill, or other surface where water leaks may occur.

The water detector can also be used for detecting water level, taking water injection of a water tank as an example, and the specific use method is as follows:

1. vertically installing a water detector at a certain height of the wall of the water pool, and then opening a water valve to start water injection;

2. when the water injection amount reaches a certain degree, the water surface submerges the four detection electrodes of the water detector, once at least two detection electrodes of the water detector are conducted, an internal circuit of the water detector can be triggered, and then the buzzer is triggered to sound, so that a user is reminded to turn off the water valve.

In other embodiments, when the water level reaches a preset value, the sending module of the water detector sends an action instruction to the water valve, the water valve is closed, and water injection is stopped; or the sending module of the water detector directly sends detection information to the mobile terminal of the user to remind the user that the water level reaches the preset value.

To sum up, the utility model discloses bury four detecting electrodes underground respectively on the connecting arris between four detection faces, when any detection face is located the plane, always have two not same polarity detecting electrodes to also be located this plane, once there is water in the plane can trigger circuit, realize the water detection function, the dependable performance; the water detector of the utility model adopts the battery to provide power supply, and the battery and the circuit board are arranged inside the insulating shell, so that the structure is compact, the volume is small, and the use places are more; the utility model discloses not only can be used as the hourglass water and detect, can also be used as water level detection, the stable performance is reliable.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.

Claims

1. A mounting structure of a detection electrode, characterized in that: the four detection electrodes are buried on connecting edges between the four detection surfaces respectively, the four detection electrodes are in a group in pairs, two groups of detection electrodes are used for being connected with a signal line electrode and a power supply electrode respectively, and the two detection electrodes located at opposite angles are connected with the same electrode.

2. A water detector, characterized by: the detection device comprises an insulating shell, a battery, a circuit board and four detection electrodes, wherein the insulating shell comprises four detection surfaces, the four detection electrodes are respectively embedded on connecting edges among the four detection surfaces, the circuit board is provided with a detection circuit, and the detection circuit comprises a signal line electrode and a power supply electrode; the four detection electrodes are grouped in pairs, two groups of detection electrodes are used for being respectively connected with the signal line electrode and the power supply electrode, and the two detection electrodes positioned at the diagonal positions are both connected with the same electrode; the battery and the circuit board are both arranged in the insulating shell.

3. The water detector of claim 2, wherein: the insulating shell comprises an upper shell, a lower shell and a connecting shell, wherein the upper shell and the lower shell are fixedly connected to two ends of the connecting shell respectively; the end of the upper shell far away from the connecting shell is closed, the end of the lower shell far away from the connecting shell is provided with an opening, and the opening is covered with a battery cover in a sealing mode.

4. The water detector of claim 3, wherein: the cross section of epitheca and inferior valve equals, the cross section of connecting the shell is less than the cross section of epitheca, after the assembly, form round siphon groove in the middle part of insulating housing.

5. The water detector of claim 3, wherein: the upper shell and the connecting shell, and the lower shell and the connecting shell are connected by an ultrasonic welding process; and a waterproof ring is arranged between the lower shell and the battery cover and is fixed through screws.

6. The water detector of claim 3, wherein: the circuit board comprises a main circuit board and an auxiliary circuit board, and the main circuit board is electrically connected with the auxiliary circuit board; the main circuit board is installed in the upper shell, and the auxiliary circuit board is installed in the connecting shell.

7. The water detector of claim 6, wherein: the inner side of the battery cover is fixedly provided with a negative spring, the battery is arranged in the lower shell in an extruding way through the negative spring, the positive pole of the battery is connected to the auxiliary circuit board, and the negative pole of the battery is connected to the negative spring; the negative electrode spring is connected with one of the detection electrodes through a telescopic probe; the four detection electrodes are all connected to the auxiliary circuit board.

8. The water detector of claim 3, wherein: the four detection electrodes are four metal sheets, the connecting shell is provided with four surfaces, and the four metal sheets are respectively embedded on connecting edges of any two surfaces.

9. The water detector of claim 2, wherein: the circuit board includes an alarm module for issuing an alarm when water is detected.

10. The water detector of claim 9, wherein: the circuit board further comprises a sending module, and the sending module is used for sending a control instruction to the water valve controller or sending detection information to a user.