CN213779189U - Liquid level detection device and water purification device - Google Patents

Abstract

The utility model discloses a liquid level detection device and a water purification device, wherein the liquid level detection device comprises a liquid level probe which is arranged on the top wall of a water tank, and the liquid level probe and the shell of the water tank are respectively connected with a liquid level detection circuit; the liquid level detection circuit comprises a divider resistor, and the divider resistor is connected in series with an equivalent resistor formed by the liquid level probe and the water tank shell and is grounded; and the alarm circuit comprises an alarm and a switching tube which are connected in series, a driving electrode of the switching tube is connected between a divider resistor and an equivalent resistor of the liquid level detection circuit, and when the voltage at two ends of the equivalent resistor is greater than the starting voltage of the switching tube, the alarm circuit is switched on to start the alarm. Liquid level detection device, realize single liquid level probe detection, reduce cost has liquid level probe corrosion degree and detects, leak and detect and remind the function, ensures that the complete machine normally works, possesses the liquid level probe of reminding and changes the function.

Description

Liquid level detection device and water purification device

Technical Field

The utility model relates to a clean quick-witted technical field of drink especially relates to a liquid level detection device and purifier.

Background

Along with the common application of water purifiers and water dispensers in public places, in order to meet the water demand of more people, water storage devices are often designed for the products. Liquid level detection modes applied to water storage equipment are many, such as ultrasonic, photoelectric, float type, probe type and the like, wherein the metal probe type is generally applied due to simple structure and low cost, but the metal probe scheme has corrosion hidden trouble (can be corroded in water or under the condition of water vapor and air), and the water level detection of the probe can be out of order after corrosion, thereby seriously causing the fault of the whole machine and causing great influence on users and after sales;

among the prior art, the water pitcher is equipped with liquid level detector, is equipped with the lid on the water pitcher, is equipped with the inlet tube on the lid, and the lid includes safety lid, water jar cover and inlet cover, and water pitcher lid lower part is equipped with water pitcher liquid level detector and cask liquid level detector, and water pitcher liquid level detector includes a plurality of water pitcher probes, utilizes the interior liquid level monitoring of liquid conductive contact realization water pitcher in each water pitcher probe and the water pitcher, and cask liquid level detector includes the cask probe, monitors the water state of depositing of cask through the voltage variation between the cask probe. The detection mode has the following defects: the implementation by voltage between the probes, not a single probe solution, results in increased cost; the accuracy of the detection result is influenced by the difference of the corrosion degree of the probe.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a liquid level detection device and purifier to easily take place electrochemical corrosion when adopting metal probe to detect the liquid level in solving current purifier, can't in time change the probe and lead to the technical problem that the liquid level detection precision is low.

In order to achieve the above object, the utility model discloses a liquid level detection device and purifier's concrete technical scheme as follows:

a liquid level detection device comprising:

the liquid level probe is arranged on the top wall of the water tank, the liquid level probe and the shell of the water tank are respectively connected with the liquid level detection circuit, and the liquid level probe and the shell of the water tank form an equivalent resistor R1;

the liquid level detection circuit comprises a voltage division resistor, and an equivalent resistor R1 is connected with the voltage division resistor R2 in series and is grounded;

the alarm circuit comprises a switch tube, a driving pole of the switch tube is connected between a divider resistor R2 and an equivalent resistor R1 of the liquid level detection circuit, the first pole of the switch tube is connected with an alarm in series, and when the voltage at two ends of the equivalent resistor R1 is greater than the starting voltage of the switch tube, the alarm circuit is switched on to start the alarm.

Furthermore, the liquid level detection circuit is provided with a plug terminal which is provided with a plurality of plug ports, the top end of the liquid level probe and the shell of the water tank are respectively connected with different plug ports of the plug terminal, so that the liquid level probe, the liquid level detection circuit and the shell of the water tank form a closed loop together through water in the water tank.

Further, the second pole of the switch is connected to the ground terminal of the equivalent resistor R1.

Further, inside the bottom of liquid level probe stretched into the water pitcher, the equivalent resistance between liquid level probe and the water pitcher was R1, and when liquid level detection circuit drive voltage was U1, the voltage U2 at equivalent resistance R1 both ends was: u2 ═ U1 × R1/(R1+ R2).

Furthermore, the water tank is kept in a full state all the time in the using process, and the length of the liquid level probe extending into the water tank is 10mm-20 mm.

Further, the bottom of water pitcher sets up the water inlet, and the top sets up the delivery port, and the water inlet intercommunication has the inlet tube, sets up the water pump on the inlet tube, and the delivery port intercommunication has the outlet pipe, sets up the outlet valve on the outlet pipe, when opening the outlet valve, opens the water pump and annotates water in to the water pitcher, relies on the pressure of intaking to realize going out water.

Furthermore, an observation window is arranged on the side wall of the water tank, and the height of the observation window is kept level with the bottom end of the liquid level probe so as to distinguish the starting reason of the alarm in the use process of the water tank.

Further, the switching tube is a switching triode, an MOS tube or an effect transistor.

Furthermore, the alarm is an audible and visual alarm or an alarm lamp.

A water purifying device comprises a water tank, wherein the liquid level detection device is arranged in the water tank.

The utility model discloses a liquid level detection device and purifier have following advantage:

liquid level detection device, realize single liquid level probe detection, reduce cost has liquid level probe corrosion degree and detects, leak and detect and remind the function, ensures that the complete machine normally works, possesses and reminds liquid level probe change function, be convenient for maintain, change, the external alarm of water pitcher breaks away from the complete machine setting, the user of being convenient for control complete machine state, does not influence normal use.

Drawings

Fig. 1 is the structure schematic diagram of the liquid level detection device of the present invention.

The reference numbers in the figures illustrate: 1. a water tank; 2. a liquid level probe; 3. a liquid level detection circuit; 4. an alarm; 5. and a switch tube.

Detailed Description

In order to better understand the purpose, structure and function of the present invention, the following description is made in detail with reference to the accompanying drawings.

As shown in figure 1, the liquid level detection device of the utility model comprises a liquid level probe 2, a liquid level detection circuit 3 and an alarm circuit, wherein,

the liquid level probe 2 is arranged on the top wall of the water tank 1, the top end of the liquid level probe 2 and the shell of the water tank 1 are respectively connected with the liquid level detection circuit 3, and the liquid level probe 2 and the shell of the water tank 1 form an equivalent resistor R1;

the liquid level detection circuit 3 comprises a voltage division resistor R2, and an equivalent resistor R1 is connected with the voltage division resistor R2 in series and is grounded;

the alarm circuit comprises a switch tube 5, a driving pole of the switch tube 5 is connected between a voltage dividing resistor R2 and an equivalent resistor R1 of the liquid level detection circuit 3, a first pole of the switch tube 5 is connected with an alarm 4 in series, and when the voltage at two ends of the equivalent resistor R1 is greater than the starting voltage of the switch tube 5, the alarm circuit is connected to start the alarm 4. Through setting up alarm 4, can indicate the user in time to solve the abnormal conditions in the liquid level detection process.

Liquid level detection circuit 3 has plug terminals, plug terminals has a plurality of interfaces, the top of liquid level probe 2, the casing of water pitcher 1 is connected with plug terminals's different interface of tearing open respectively, so that liquid level probe 2 passes through the water in the water pitcher 1, with liquid level detection circuit 3, constitute closed circuit together with water pitcher 1 casing, liquid level detection circuit 3's output and switch tube 5 parallel connection, divider resistance R2 is used for the current-limiting, still include the earthing terminal, switch tube 5's second pole is connected with equivalent resistance R1's earthing terminal.

Inside liquid level probe 2's bottom stretched into water pitcher 1, the equivalent resistance between liquid level probe 2 and the water pitcher 1 was R1, and when liquid level detection circuit 3 driving voltage was U1, the voltage U2 at equivalent resistance R1 both ends was:

U2＝U1*R1/(R1+R2)

wherein, R2 is a divider resistor.

From the above formula, when U1 and R2 are fixed, the larger R1, the larger U2; the smaller R1, the smaller U2.

The starting voltage Uon of switch tube 5, and U1 is greater than Uon, and when U2 is greater than Uon, switch tube 5 switches on, and the alarm circuit switches on, starts alarm 4, and when U2 is less than Uon, switch tube 5 does not switch on, and alarm 4 does not work.

The bottom of water pitcher 1 sets up the water inlet, and the top sets up the delivery port, and the water inlet intercommunication has the inlet tube, sets up the water pump on the inlet tube, and the delivery port intercommunication has the outlet pipe, sets up the outlet valve on the outlet pipe. When the water outlet valve is opened, the water pump is opened to fill water into the water tank 1, and water outlet is realized by means of water inlet pressure.

Water pitcher 1 is in normal use, rely on water inlet pressure to realize going out water, water pitcher 1 keeps water full state always, the length that liquid level probe 2 stretched into water pitcher 1 inside is at 10mm-20mm, when water pitcher 1 appeared leaking, the liquid level in the water pitcher 1 reduces from full water level gradually, when the liquid level dropped to liquid level probe 2 lower extreme or liquid level probe 2 below, appear opening suddenly when alarm 4 appears in the use, show that water pitcher 1 leaks water, lead to the water level to liquid level probe 2 below, the suggestion user overhauls.

An observation window is arranged on the side wall of the water tank 1, the height of the observation window is equal to the bottom end of the liquid level probe 2, so that the reason for starting the alarm 4 of the water tank 1 in the using process is confirmed, and water leakage alarm or serious corrosion alarm of the liquid level probe 2 is distinguished. When water is added into the water tank 1, the liquid level passes through the liquid level probe 2, so that the liquid level detection circuit 3 is conducted, if the liquid level probe 2 is not corroded or the corrosion degree is light, namely the equivalent resistance R1 is small, at the moment, the U2 is small and is smaller than the starting voltage Uon of the switch tube 5, the switch tube 5 is not conducted, the alarm 4 does not work, and the liquid level probe 2 is normal; if liquid level probe 2 corrodes seriously after, equivalent resistance R1 grow, when U2 is greater than switching tube 5's opening voltage Uon, switching tube 5 switches on, and alarm 4 starts to the suggestion user overhauls, changes liquid level probe 2.

In general, the switching tube 5 may adopt a switching transistor, a MOS tube, an effect transistor, or the like. The alarm 4 can be an audible and visual alarm, an alarm lamp, etc.

The application still provides a purifier, including water pitcher 1, be equipped with foretell liquid level detection device in the water pitcher 1. Through setting up foretell liquid level detection device, realize single liquid level probe 2 and detect, reduce cost has 2 corrosion degree of liquid level probe and detects, leak and detect and remind the function, ensures that the complete machine normally works, possesses and reminds 2 change functions of liquid level probe, be convenient for maintain, change, water pitcher 1 external alarm 4 breaks away from the complete machine setting, and the user of being convenient for monitors the complete machine state, does not influence normal use.

It is to be understood that the present invention has been described with reference to certain embodiments, and that various changes or equivalents may be substituted for elements thereof by those skilled in the art without departing from the spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of the present application are intended to be covered by the present invention.

Claims (10)

1. A liquid level detection device, comprising:

the liquid level probe (2) is arranged on the top wall of the water tank (1), the shells of the liquid level probe (2) and the water tank (1) are respectively connected with the liquid level detection circuit (3), and the shells of the liquid level probe (2) and the water tank (1) form an equivalent resistor R1;

the liquid level detection circuit (3) comprises a voltage division resistor R2, and an equivalent resistor R1 is connected with the voltage division resistor R2 in series and is grounded;

the alarm circuit comprises a switch tube (5), wherein a driving pole of the switch tube (5) is connected between a divider resistor R2 and an equivalent resistor R1 of a liquid level detection circuit (3), a first pole of the switch tube (5) is connected with an alarm (4) in series, and when the voltage at two ends of the equivalent resistor R1 is greater than the starting voltage of the switch tube (5), the alarm circuit is connected to start the alarm (4).

2. The liquid level detection device according to claim 1, wherein the liquid level detection circuit (3) has a plug terminal having a plurality of plug ports, and the top end of the liquid level probe (2) and the housing of the water tank (1) are respectively connected with different plug ports of the plug terminal, so that the liquid level probe (2) forms a closed loop together with the liquid level detection circuit (3) and the housing of the water tank (1) through the water in the water tank (1).

3. The liquid level detection device according to claim 2, wherein the second pole of the switching tube (5) is connected to the ground terminal of the equivalent resistor R1.

4. The liquid level detecting device according to claim 2, wherein the bottom end of the liquid level probe (2) extends into the water tank (1), the equivalent resistance between the liquid level probe (2) and the water tank (1) is R1, and when the driving voltage of the liquid level detecting circuit (3) is U1, the voltage U2 across the equivalent resistance R1 is: u2 ═ U1 × R1/(R1+ R2).

5. A liquid level detection device according to claim 4, characterized in that the water tank (1) is kept full of water during use, and the length of the liquid level probe (2) extending into the interior of the water tank (1) is 10mm-20 mm.

6. The liquid level detection device according to claim 5, wherein the water tank (1) is provided with a water inlet at the bottom, a water outlet at the top, a water inlet communicated with a water inlet pipe, a water pump arranged on the water inlet pipe, a water outlet communicated with a water outlet pipe, and a water outlet valve arranged on the water outlet pipe, when the water outlet valve is opened, the water pump is opened to fill water into the water tank (1), and water outlet is realized by water inlet pressure.

7. The liquid level detection device according to claim 5, wherein an observation window is arranged on the side wall of the water tank (1), and the height of the observation window is equal to the bottom end of the liquid level probe (2) so as to distinguish the starting reason of the alarm (4) in the use process of the water tank (1).

8. The liquid level detection device according to claim 1, wherein the switching tube (5) is a switching transistor, a MOS tube or an effect transistor.

9. The liquid level detection device according to claim 1, characterized in that the alarm (4) is an audible and visual alarm or an alarm lamp.

10. A water purification device comprising a water tank (1), characterized in that the water tank (1) is provided with a liquid level detection device according to any one of claims 1-9.

Images