CN217032680U - Non-contact water shortage detection device and electronic equipment - Google Patents

Abstract

The utility model discloses a non-contact water shortage detection device and electronic equipment, and belongs to the field of detection. The non-contact water shortage detection device comprises a PCBA, an induction chip, a detection circuit and an induction module; the response module welding is on PCBA for the tight sleeve is at the lateral wall with the drain pipe of flourishing water receptacle bottom intercommunication, a water flow state for acquireing the drain pipe, and produce corresponding current capacitance value according to the water flow state of drain pipe, the response chip is used for connecting response module and central processing unit respectively, the response chip still is used for detecting the current capacitance value of response module, current capacitance value that produces when having rivers and not having rivers according to the drain pipe changes the output detection signal and gives central processing unit with the water shortage state of confirming flourishing water receptacle. The non-contact water shortage detection device can output accurate detection signals through the induction chip to represent that the water container is in a water shortage state, and therefore the detection accuracy of the detection device for the water shortage state of the water container is improved.

Description

Non-contact type water shortage detection device and electronic equipment

Technical Field

The utility model relates to the field of detection, in particular to a non-contact type water shortage detection device and electronic equipment.

Background

At present, many electronic products (such as humidifiers and mopping machines) are provided with water containers, and most of the water containers are provided with water shortage detection devices. The water shortage detection device usually has two detection modes of a non-contact type and a contact type, the contact type water shortage detection device has the problem that the direct contact of an electrode and water can generate electrochemical electrode corrosion and scale, so that the detection sensitivity is influenced, and the non-contact type water shortage detection device is more widely applied because of the absence of the defects. Adopt the non-contact water shortage detection device that the electric capacity detected the principle and detect the water level, the majority is that the water tank glues shell outer wall and pastes the response piece that can lead electric conduction object such as copper foil or conductive cloth and make, then link to each other through the water level detection chip of wire and pick-up plate, when the water level in the flourishing water container is less than detection device, detection device can detect the difference change of the relative area (electric capacity) between water level and the response piece and output the voltage variation signal that flourishing water container lacked water and supply CPU detection discernment, but to products such as mopping machine that the water tank dress often can rock along with the handle random slope on the handle, relative area difference between water tank water level and the response piece is great when because of different inclination, produce the condition of lack of water misjudgement very easily during rocking. Therefore, how to provide an effective non-contact water shortage detection device to improve the accuracy of water shortage detection of water containers of mopping machines and other products is a problem to be solved urgently.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the utility model provides a non-contact water shortage detection device which can accurately detect the water shortage state of a water container, thereby improving the working stability of electronic equipment.

The utility model also provides electronic equipment with the non-contact type water shortage detection device.

According to the embodiment of the first aspect of the utility model, the non-contact water shortage detection device comprises a PCBA, an induction chip, a detection circuit and an induction module;

the PCBA is used for installing the induction chip and the detection circuit and fixing the induction module;

the induction module is used for being welded on the PCBA, is tightly sleeved on the outer side wall of a drain pipe communicated with the bottom of the water container, is used for acquiring the water flow state of the drain pipe and obtaining the current capacitance value according to the water flow state;

the sensing chip is used for being installed on the surface of the PCBA, the sensing chip is further used for being connected with the sensing module and the central processing unit respectively, and the sensing chip is further used for detecting the current capacitance value of the sensing module and outputting a detection signal to the central processing unit according to the current capacitance value so as to determine the water shortage state of the water container.

The non-contact water shortage detection device provided by the embodiment of the utility model at least has the following beneficial effects: the non-contact water shortage detection device can acquire the water flow state of the drain pipe through the spring tightly sleeved on the outer side wall of the drain pipe, and can detect the change of the current capacitance value of the sensing module according to the current capacitance value of the drain pipe when different water flow states generate changes when water flow exists or does not exist, and output the correspondingly changed high and low levels to the central processing unit so as to determine the water shortage state of the water container. Because the drain pipe sets up in flourishing water receptacle's bottom and with flourishing water receptacle intercommunication, consequently when flourishing water receptacle takes place to rock, detection device's testing process and testing result can not receive the influence yet to solved in the use because flourishing water receptacle slope, rock the erroneous judgement problem that causes, improved detection device to flourishing water receptacle lack of water state's detection accuracy. Simultaneously, this kind of detection device comes the response to detect at the lateral wall of drain pipe through the spring lock sleeve, compares in using traditional PCB copper foil response module, has avoided in order to obtain necessary response area and response sensitivity and crowded bend department can have the residual water and lead to lack of water to detect the inflexible problem of drain pipe that the crowded drain pipe that causes is flattened the drain pipe and can have simple structure, response sensitivity, dependable performance, non-contact detection use safer advantage.

According to some embodiments of the utility model, the sensing module is a spring welded to the PCBA, the spring adapted to be tightly fitted over an outer sidewall of the drain pipe and further adapted to capture a flow condition of the drain pipe.

According to some embodiments of the utility model, the first pin of the sensing chip is grounded, and the PCBA is provided with:

and the first end of the first capacitor is connected with the second pin of the induction chip, and the second end of the first capacitor is grounded.

According to some embodiments of the utility model, the PCBA further comprises:

and a first end of the second capacitor is connected with the third pin of the induction chip, and a second end of the second capacitor is grounded.

According to some embodiments of the utility model, the PCBA further comprises:

a first end of the first resistor is connected with a fourth pin of the induction chip;

and the first end of the third capacitor is connected with the second end of the first resistor, and the second end of the third capacitor is grounded and used for comparing the capacitance value of the third capacitor with the current capacitance value of the sensing module and outputting a detection signal to determine the water shortage state of the water container.

According to some embodiments of the utility model, the PCBA further comprises:

and the first end of the second resistor is connected with the spring, and the second end of the second resistor is connected with the fifth pin of the induction chip.

According to some embodiments of the utility model, the PCBA further has disposed thereon:

and the first end of the third resistor is connected with an external power supply, and the second end of the third resistor is respectively connected with the sixth pin of the induction chip and the central processing unit.

According to some embodiments of the utility model, the PCBA further comprises:

a first end of the magnetic bead is connected with the external power supply, and a second end of the magnetic bead is connected with a seventh pin of the induction chip and an eighth pin of the induction chip;

a first end of the fourth capacitor is connected with the external power supply, and a second end of the fourth capacitor is grounded;

and a first end of the fifth capacitor is respectively connected with the second end of the magnetic bead, the seventh pin of the induction chip and the eighth pin of the induction chip, and a second end of the fifth capacitor is grounded.

According to some embodiments of the utility model, the sensing chip is an SC01 touch chip.

An electronic device according to an embodiment of a second aspect of the present invention includes a non-contact water shortage detection apparatus according to an embodiment of the first aspect.

According to the electronic equipment provided by the embodiment of the utility model, at least the following beneficial effects are achieved: the electronic equipment adopts the detection device to acquire the water flow state of the drain pipe through the spring tightly sleeved on the outer side wall of the drain pipe, and the sensing chip can detect the change of the current capacitance value of the sensing module according to the current capacitance value of the drain pipe when the water flow state and the current flow state are different when the water flow state does not exist, and output the correspondingly changed high and low levels to the central processing unit so as to determine the water shortage state of the water container. Because the drain pipe sets up in flourishing water receptacle's bottom and with flourishing water receptacle intercommunication, consequently when flourishing water receptacle takes place to rock, detection device's testing process and testing result can not receive the influence yet to solved in the use because flourishing water receptacle slope, rock the erroneous judgement problem that causes, improved detection device to flourishing water receptacle lack of water state's detection accuracy. Simultaneously, this kind of detection device establishes the lateral wall at the drain pipe through the spring housing and responds to the detection, compares in using traditional PCB copper foil response module, has avoided can having the residual water and lead to lacking water to detect the inflexible problem by crowded curved department can exist in the drain pipe that has avoided crowding flat the drain pipe and cause in order to acquire necessary response area and response sensitivity, has simple structure, response sensitivity, dependable performance, non-contact detection and uses safer advantage.

Drawings

The utility model is further described with reference to the following figures and examples, in which:

FIG. 1 is a schematic block diagram of a non-contact water shortage detection apparatus according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a non-contact water shortage detection apparatus according to another embodiment of the present invention;

fig. 3 is a circuit structure diagram of a non-contact water shortage detection apparatus according to another embodiment of the present invention.

Reference numerals are as follows: 100. a sensing module; 200. an induction chip; 300. a central processing unit; 400. and a water discharge pipe.

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 or similar 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 accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, the meaning of a plurality is one or more, the meaning of a plurality is two or more, and larger, smaller, larger, etc. are understood as excluding the present numbers, and larger, smaller, inner, etc. are understood as including the present numbers. If there is a description of first and second for the purpose of distinguishing technical features only, this is not to be understood as indicating or implying a relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of technical features indicated.

In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.

In the description of the present invention, reference to the description of "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples", etc., means 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 present invention. In this specification, the schematic representations of the terms used above do not necessarily 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.

In a first aspect, referring to fig. 1 and 2, a detection apparatus according to an embodiment of the present invention includes a PCBA, a sensing module 100, a sensing chip 200, a detection circuit, a central processing unit 300, and a drain pipe 400. The PCBA is used for installing the induction chip 200 and the detection circuit and fixing the induction module 100; the induction module 100 is welded on the PCBA, is tightly sleeved on the outer side wall of the drain pipe 400 communicated with the bottom of the water container, and is used for acquiring the water flow state of the drain pipe 400 and obtaining the current capacitance value according to the water flow state; the sensing chip 200 is mounted on the PCBA for connecting the sensing module 100 and the central processor 300, respectively, and the sensing chip 200 is further configured to detect a current capacitance value of the sensing module 100, and output a detection signal to the central processor 300 according to the current capacitance value to determine a water shortage state of the water container. Specifically, a drain pipe 400 is connected to the bottom of the water container, and water in the water container flows into the water consumption device of the electronic product through the drain pipe 400. The outer side wall of the drain pipe 400 is sleeved with the induction module 100, the PCBA adopts an FR-4 double-sided board with good moisture resistance, and the PCBA reserves three lines of a power supply terminal VCC, a grounding terminal GND and an output terminal OUT to be connected with the central processing unit 300. The sensing module 100 is welded on the PCBA for acquiring a water flow state of the drain pipe 400 and generating a corresponding current capacitance value according to the water flow state. Specifically, when the sensing module 100 detects that water flows into the drain pipe 400, the current capacitance value of the sensing module 100 is a first preset capacitance value; when the sensing module 100 detects that no water flows into the drain pipe 400, the current capacitance value changed by the sensing module 100 is the second preset capacitance value. The PCBA is provided with a sensing chip 200, the sensing chip 200 can detect the change of the current capacitance value of the sensing module 100 and output a detection signal to the central processing unit 300 to determine the water shortage state of the water container, and specifically, when the sensing chip 200 detects that the capacitance value of the sensing module 100 is a first preset capacitance value, the sensing chip 200 outputs a low level to the central processing unit 300 to represent that the water container is in the water state; when the sensing chip 200 detects that the capacitance of the sensing module 100 is the second predetermined capacitance, the sensing chip 200 outputs a high level to the central processing unit 300 to indicate that the water container is in a water-deficient state. Since the drain pipe 400 is disposed at the bottom of the water container and is communicated with the water container, the detection process of the detection device is not affected when the water container shakes. The detection device can output accurate detection signals to represent whether the water container is in a water shortage state or not, and the working reliability of the detection device is improved. Meanwhile, the detection device has the advantages of simple structure, lower cost and higher use safety.

Referring to fig. 2, in some embodiments, the sensor module 100 is a spring welded to the PCBA and tightly fitted over an outer sidewall of a drain tube 400 communicating with the bottom of the water container, for capturing a water flow state of the drain tube 400 and generating a current capacitance value according to the water flow state. In the working process of the detection device, when water flows into the water discharge pipe 400 from the water container, the capacitance of the spring is greater than the preset capacitance, and the sensing chip 200 detects that the capacitance of the spring is greater than the preset capacitance, so as to output a low level signal (i.e. a water signal from the water container) to the central processing unit 300; on the contrary, when no water flows into the drain pipe 400, the capacitance of the spring is smaller than the predetermined capacitance, and the sensing chip 200 detects that the capacitance of the spring is smaller than the predetermined capacitance, thereby outputting a high level signal (i.e., a water shortage signal) to the cpu 300. Because the spring is tightly sleeved on the outer side wall of the drain pipe 400, the induction sensitivity is high, and the problem that the residual water at the bent part cannot be drained to the greatest extent to cause water shortage detection is solved because the drain pipe 400 is not squeezed flat, and the working reliability of the detection device can be improved by adopting the spring as the induction module 100.

Referring to fig. 3, in some embodiments, the first pin of the sensing chip 200 is grounded, the PCBA is provided with a first capacitor C1, a first end of the first capacitor C1 is connected to the second pin of the sensing chip 200, and a second end of the first capacitor C1 is grounded.

Referring to fig. 3, in some embodiments, a second capacitor C2 is further disposed on the PCBA, a first terminal of the second capacitor C2 is connected to the third pin of the sense die 200, and a second terminal of the second capacitor C2 is grounded. The capacitance of the second capacitor C2 can be adjusted as required to adjust the detection sensitivity of the sensing module 100 and improve the applicability of the water shortage detection device. In some other embodiments, the second capacitor C2 is a capacitor having a capacitance of between 15PF and 20 PF.

Referring to fig. 3, in some embodiments, a first resistor R1 and a third capacitor C3 are also disposed on the PCBA; a first end of the first resistor R1 is connected to a fourth pin of the sensing chip 200; the first end of the third capacitor C3 is connected to the second end of the first resistor R1, and the second end of the third capacitor C3 is grounded, so as to output a detection signal to determine the water shortage state of the water container according to the comparison between the capacitance value of the third capacitor C3 and the current capacitance value of the sensing module 100. The third capacitor C3 is a preset reference capacitor, and the third capacitor C3 is adjusted such that the capacitance of the third capacitor C3 is close to that of the spring, and the detection sensitivity of the detection device is the highest at this time. When water flows into the drain pipe 400, the capacitance of the spring is greater than the preset reference capacitance value of 0.2PF, and the sensing chip 200 detects that the capacitance of the spring is greater than the preset reference capacitance value of 0.2PF, so as to output a low level signal (i.e., a water signal of the water container) to the cpu 300; on the contrary, when the water container has no water flowing into the drain pipe 400, the capacitance of the spring is smaller than the preset reference capacitance value of 0.2PF, and the sensing chip 200 detects that the capacitance of the spring is smaller than the preset reference capacitance value of 0.2PF, thereby outputting a high level signal (i.e., a water shortage signal of the water container) to the cpu 300. The sensing chip 200 determines the water flow state of the water discharge pipe 400 by detecting the difference between the spring capacity and the third capacitor C3, so as to output a corresponding high level or low level to the cpu 300 to determine the water shortage state of the water container.

In some embodiments, the third capacitor C3 is a high precision COG or NPO capacitor. During operation of the detection device, the third capacitor C3 may be tuned as follows: if no water flows into the water discharge pipe 400 and the sensing chip 200 outputs a low level signal (i.e., a water signal is present in the water container), it indicates that the capacitance of the third capacitor C3 is too small, and the sensing sensitivity of the sensing device is too high, so that the capacitance of the third capacitor C3 needs to be increased; when water flows into the water discharge pipe 400 and the sensor chip 200 outputs a high level signal (i.e., no water signal from the water container), it indicates that the capacitance of the third capacitor C3 is too large, and the detection sensitivity of the sensor device is too low, so that the capacitance of the third capacitor C3 needs to be reduced. In some other embodiments, the capacitance of the third capacitor C3 is selected to be about 0.2PF greater than the spring capacitance.

Referring to fig. 3, in some embodiments, a second resistor R2 is further disposed on the PCBA, a first end of the second resistor R2 is connected to the spring, and a second end of the second resistor R2 is connected to the fifth pin of the sense die 200.

Referring to fig. 3, in some embodiments, a third resistor R3 is further disposed on the PCBA, a first end of the third resistor R3 is connected to the external power VCC, and a second end of the third resistor R3 is respectively connected to the sixth pin of the sense chip 200 and the central processor 300. In the operation process of the detection circuit, the third resistor R3 as a pull-up resistor can be used to convert the detection signal of the sensing chip 200 into a high-low level signal and output the signal to the central processing unit 300, so as to determine the water shortage state of the water container.

Referring to fig. 3, in some specific embodiments, a magnetic bead L1, a fourth capacitor C4, and a fifth capacitor C5 are further disposed on the PCBA; a first end of the magnetic bead L1 is connected with an external power supply VCC, and a second end of the magnetic bead L1 is connected with a seventh pin of the sensing chip 200 and an eighth pin of the sensing chip 200; a first end of the fourth capacitor C4 is connected with an external power supply VCC, and a second end of the fourth capacitor C4 is grounded; a first end of the fifth capacitor C5 is connected to the second end of the magnetic bead L1, the seventh pin of the sensing chip 200, and the eighth pin of the sensing chip 200, respectively, and a second end of the fifth capacitor C5 is grounded. In order to reduce the influence of electromagnetic interference on the detection circuit, the magnetic bead L1, the fourth capacitor C4 and the fifth capacitor C5 form an electromagnetic interference elimination circuit for reducing the electromagnetic interference in the detection circuit, so that the detection accuracy of the water shortage detection device is improved.

In some embodiments, the sensor chip 200 is an SC01 single bond capacitive touch chip. SC01 is SOP-8 paster encapsulation chip, and operating voltage is between 2.5V to 6.0V, and SC01 touches chip cost lower, and simultaneously, SC01 touches chip's detection sensitivity higher, can improve detection device's detection accuracy. It should be noted that, in some other embodiments, the sensing chip 200 may also be a touch chip of another type, which is not limited to this.

In some embodiments, the spring is selected from nickel-plated carbon steel wire with a wire diameter of 0.7mm wound 9 turns, the turn pitch is 1.3mm, the pin lengths at both ends are 3.5mm (for soldering on the PCBA), and the inner diameter of the wound spring is as large as the outer diameter of the drain pipe 400 to achieve a tight fit with the drain pipe 400 to ensure the necessary sensitivity. The capacitance of the third capacitor C3 is (2 PF-2.5 PF) ± 5%, specifically according to the practical condition, for the colloid drain pipe 400 with the inner diameter phi of 6.2mm, 2PF can be selected as the third capacitor C3; the capacitance of the second capacitor C2 is (15 PF-20 PF) ± 5%; the capacitance of the first capacitor C1 is 4.7 nF. The first resistor R1 adopts a resistor of 3 kiloohms; the second resistor R2 is a resistor of 3 kilo-ohms to 5.1 kilo-ohms, and is used to prevent external electrostatic breakdown from damaging the sensing chip 200. The third resistor R3 adopts a resistance of 4.7 kilo-ohms to 10 kilo-ohms; the magnetic bead L1 is 0603 or 0805 packaging patch magnetic beads with the ohm of 600 and the MHz of 100 MHz; the capacitance of the fourth capacitor C4 is 100 nF; the capacitance of the fifth capacitor C5 is 100 nF. It should be noted that in some other embodiments, other types of components may also be adopted, and the utility model is not limited to this.

In a second aspect, an embodiment of the present invention further provides an electronic device, which includes the non-contact water shortage detection apparatus shown in the first aspect.

The electronic device using the non-contact water shortage detection apparatus of the above embodiment can obtain the water flow state of the drain pipe 400 through the sensing module 100, and generate a corresponding current capacitance value according to the water flow state of the drain pipe 400, the sensing chip 200 can detect the current capacitance value of the sensing module 100, and output a detection signal to the central processing unit 300 according to the current capacitance values of the drain pipe 400 that are different when there is water flow and when there is no water flow, so as to determine the water containing state of the water container. Because the drain pipe 400 is communicated with the bottom of the water container, when the sensing module 100 detects that no water flows into the drain pipe 400, the sensing chip 200 can output an accurate detection signal to represent that the water container is in a water shortage state, so that the detection accuracy of the detection device on the water shortage state of the water container is improved. Meanwhile, the detection device has the advantages of simple structure, reliable performance and higher use safety.

The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention. Furthermore, the embodiments of the present invention and features of the embodiments may be combined with each other without conflict.

Claims (10)

1. A non-contact water shortage detection device, comprising: the device comprises a PCBA, an induction chip, a detection circuit and an induction module;

the PCBA is used for installing the induction chip and the detection circuit and fixing the induction module;

the induction module is used for being welded on the PCBA, is tightly sleeved on the outer side wall of a drain pipe communicated with the bottom of the water container, is used for acquiring the water flow state of the drain pipe and obtaining the current capacitance value according to the water flow state;

the sensing chip is used for being installed on the surface of the PCBA, the sensing chip is further used for being connected with the sensing module and the central processing unit respectively, the sensing chip is further used for detecting the current capacitance value of the sensing module, and outputting a detection signal to the central processing unit according to the current capacitance value so as to determine the water shortage state of the water container.

2. The non-contact water shortage detection device according to claim 1, wherein the sensing module is a spring welded to the PCBA, and the spring is used for tightly sleeving an outer side wall of the drain pipe and is also used for acquiring a water flow state of the drain pipe.

3. The non-contact water shortage detection device according to claim 2, wherein the first pin of the induction chip is grounded, and the PCBA is provided with:

and the first end of the first capacitor is connected with the second pin of the induction chip, and the second end of the first capacitor is grounded.

4. A non-contact water shortage detection apparatus as claimed in claim 3, wherein the PCBA is further provided with:

and a first end of the second capacitor is connected with the third pin of the induction chip, and a second end of the second capacitor is grounded.

5. A non-contact water shortage detection device according to claim 4, wherein the PCBA is further provided with:

a first end of the first resistor is connected with a fourth pin of the induction chip;

and the first end of the third capacitor is connected with the second end of the first resistor, and the second end of the third capacitor is grounded and used for comparing the capacitance value of the third capacitor with the current capacitance value of the sensing module and outputting a detection signal to determine the water shortage state of the water container.

6. A non-contact water shortage detection device according to claim 5, wherein the PCBA is further provided with:

and a first end of the second resistor is connected with the spring, and a second end of the second resistor is connected with a fifth pin of the induction chip.

7. A non-contact water shortage detection apparatus as claimed in claim 6, wherein the PCBA is further provided with:

and a first end of the third resistor is connected with an external power supply, and a second end of the third resistor is respectively connected with a sixth pin of the induction chip and the central processing unit.

8. A non-contact water shortage detection apparatus as claimed in claim 7, wherein the PCBA is further provided with:

a first end of the magnetic bead is connected with the external power supply, and a second end of the magnetic bead is connected with a seventh pin of the induction chip and an eighth pin of the induction chip;

a first end of the fourth capacitor is connected with the external power supply, and a second end of the fourth capacitor is grounded;

and a first end of the fifth capacitor is respectively connected with the second end of the magnetic bead, the seventh pin of the induction chip and the eighth pin of the induction chip, and a second end of the fifth capacitor is grounded.

9. The device according to any one of claims 1 to 8, wherein the sensor chip is an SC01 touch chip.

10. Electronic equipment, characterized in that it comprises a non-contact water shortage detection apparatus as claimed in any one of claims 1 to 9.

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