CN217818936U - Liquid level detection device, liquid pump and laundry equipment - Google Patents

Abstract

The application provides a liquid level detection device, liquid pump and laundry device, liquid level detection device includes: the liquid level sensor comprises a guide rod, a floating device and an oscillating circuit, wherein the oscillating circuit and the guide rod can be fixedly arranged in a container, the guide rod and the floating device can be arranged in the container, the floating device is in sliding connection with the guide rod, and the oscillating circuit is used for sensing the position change of the floating device so as to determine the liquid level information of liquid in the container. The liquid level detection function of the liquid pump is realized, so that the washing equipment controls the liquid pump to work according to the liquid level of the liquid pump, and the drainage noise of the liquid pump in a water-gas mixing state can be reduced or eliminated.

Description

Liquid level detection device, liquid pump and laundry equipment

Technical Field

The application belongs to the technical field of liquid level detection, and especially relates to a liquid level detection device, a liquid pump and a washing device.

Background

Laundry equipment's use has generally been applied to people's life, but laundry equipment's noise problem is the problem that laundry equipment waited to solve urgently always, especially in laundry equipment drainage stage, because laundry equipment carries out the drainage through the liquid pump, in the drainage process, the liquid pump only works according to the procedure that the washing machine controller set for alone, the liquid pump can not make detection feedback to the water level condition in the pump chamber, if the wash tub in-water is few when being insufficient for full of the pump chamber, because the impeller of liquid pump is not totally submerged in the water, the pump chamber is in half water half gas state, the noise of this stage will be very big, user experience is relatively poor.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a liquid level detection device, a liquid pump and laundry equipment, can reduce or eliminate drainage noise under the liquid pump aqueous vapor mixing state.

The embodiment of the application provides a liquid level detection device, liquid level detection device includes: the liquid level sensor comprises a guide rod, a floating device and an oscillating circuit, wherein the oscillating circuit and the guide rod can be fixedly arranged in a container, the guide rod and the floating device can be arranged in the container, the floating device is in sliding connection with the guide rod, and the oscillating circuit is used for sensing the position change of the floating device so as to determine the liquid level information of liquid in the container.

Optionally, the floating device includes a floating member and a magnetic member, the floating member is fixedly connected to the magnetic member, and the floating member and/or the magnetic member are slidably connected to the guide rod.

Optionally, the oscillating circuit is disposed at an end of the guide bar.

Optionally, two ends of the guide rod are respectively connected with two inner walls of the container, which are oppositely arranged.

Optionally, the oscillating circuit includes an inductor and a capacitor, and the inductor is disposed around an end of the guide rod.

Alternatively, the oscillating circuit may be provided to the container by injection molding.

The application still provides a liquid pump, including the pump body, and as above liquid level detection device, the pump body has the pump chamber, oscillating circuit and guide arm fixed set up in the pump body, floating installation accept in the pump chamber.

Embodiments of the present application also provide a laundry device including the liquid pump as described above.

Optionally, the laundry appliance includes a processor, and the oscillating circuit is electrically connected to the processor.

Optionally, the oscillation circuit is electrically connected to the liquid pump.

The embodiment of the application provides a liquid level detection device, liquid pump and laundry equipment, liquid level detection device includes: the liquid level sensor comprises a guide rod, a floating device and an oscillating circuit, wherein the oscillating circuit and the guide rod can be fixedly arranged in a container, the guide rod and the floating device can be arranged in the container, the floating device is connected with the guide rod in a sliding mode, and the oscillating circuit is used for sensing the position change of the floating device so as to determine the liquid level information of liquid in the container. The liquid level detection function of the liquid pump is realized, so that the washing equipment controls the liquid pump to work according to the liquid level of the liquid pump, and the drainage noise of the liquid pump in a water-gas mixing state can be reduced or eliminated.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the application, and that other drawings can be derived from these drawings by a person skilled in the art without inventive effort.

For a more complete understanding of the present application and its advantages, reference is now made to the following descriptions taken in conjunction with the accompanying drawings. Wherein like reference numerals refer to like parts in the following description.

Fig. 1 is a schematic structural diagram of a liquid level detection apparatus provided in an embodiment of the present application.

Fig. 2 is a first schematic diagram of an oscillation circuit according to an embodiment of the present disclosure.

Fig. 3 is a second schematic diagram of an oscillation circuit according to an embodiment of the present disclosure.

Fig. 4 is a schematic structural diagram of a liquid pump according to an embodiment of the present application.

Fig. 5 is a schematic structural diagram of a laundry device according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a liquid level detection apparatus according to an embodiment of the present disclosure. The application provides a liquid level detection device 10, liquid level detection device 10 includes: the liquid level detection device comprises a guide rod 11, a floating device 12 and an oscillating circuit 13, wherein the oscillating circuit 13 and the guide rod 11 can be fixedly arranged in a container 14, the guide rod 11 and the floating device 12 can be arranged in the container 14, the floating device 12 is connected with the guide rod 11 in a sliding mode, and the oscillating circuit 13 is used for sensing and detecting the position change of the floating device 12 to determine the liquid level information of liquid in the container.

Liquid level detection device 10, can use in liquid level detection field, use and use liquid pump as an example, container 14 can be the pump body of liquid pump, can hold liquid in the pump body, floating installation 12 sets up in the pump chamber that the pump body formed, can set up the bottom at the pump chamber when there is not liquid in the pump chamber, will float along with liquid when having liquid, consequently when liquid level changes in the pump chamber, floating installation 12 slides along guide arm 11, thereby change and set up the distance at the oscillating circuit 13 of guide arm 11 tip, oscillating circuit 13 confirms the liquid level information of liquid in the pump chamber through the position change of response floating installation. The liquid level detection function of the liquid pump is realized, so that the liquid pump is controlled to work according to the liquid level of the liquid pump, for example, the liquid pump is started and stopped, and the drainage noise of the liquid pump in a water-gas mixed state can be reduced or eliminated.

In some embodiments, the floating device 12 may include a floating member 121 and a magnetic member 122, the floating member 121 is fixedly connected to the magnetic member 122, the floating member 121 and/or the magnetic member 122 may be slidably connected to the guide rod, for example, the floating member 121 is slidably connected to the guide rod 11, and the magnetic member 122 may be disposed on the floating member 121 or embedded inside the floating member; for another example, the magnetic member 122 is slidably connected to the guide bar 11, and the floating member 121 may be disposed on the magnetic member 122; for another example, the floating member 121 and the magnetic member 122 may be integrally formed, and the floating member 121 and the magnetic member 122 are slidably connected to the guide bar 11 at the same time.

Wherein, when the liquid level in the container 14 changes, because the effect of buoyancy, the floating part 121 can slide along guide arm 11 so that floating part 121 keeps floating on the liquid level all the time to change the distance with magnetic part 122 and oscillating circuit 13 of floating part 121 fixed connection, oscillating circuit 13 can sense the position change of magnetic part 122, and then generate the response information, and the external world detects the response information, thereby obtains the liquid level in the pump body and reaches the information of setting for the height, with the detection liquid level. Therefore, the water in the pump body is controlled to be discharged or discharged according to the liquid level so as to control the starting and stopping of the liquid pump. The water discharge noise in the water-gas mixed state of the liquid pump can be reduced or eliminated.

In order to improve the sensing accuracy of the oscillating circuit 13, the oscillating circuit 13 may be disposed at the end of the guide rod 11, so that the magnetic member 122 and the oscillating circuit 13 have the largest range, thereby improving the liquid level detection accuracy. The oscillating circuit 13 may be disposed on the inner wall of the container by injection molding.

In some embodiments, in order to improve the stability of the guide bar 11, both ends of the guide bar 11 may be fixedly connected to the inner wall of the container 14, respectively. It will be appreciated that the container 14 may include first and second oppositely disposed interior walls 141, 142, wherein the liquid level may reach the first interior wall 141 when the container 14 is filled with liquid, and wherein the liquid level may be drained from the container 14 when the container is submerged in the first interior wall 141 and the liquid level reaches the second interior wall 142. The liquid level in the container 14 can be detected by the liquid level detection device 10.

In particular, the oscillating circuit 13 may comprise an LC circuit comprising an inductor 131 and a capacitor 132, the inductor 131 may be arranged around the end of the conductor bar 11. When the liquid level in the container 14 changes, the floating member 121 drives the magnetic member 122 to slide, the position of the magnetic member 122 changes, and the inductance of the inductance coil 131 changes due to the effect of the magnetic member 122 on the inductance coil 131, so that the frequency of the oscillating circuit is changed, and the specific liquid level in the container is judged by detecting the change of the frequency.

Referring to fig. 2 and fig. 3, fig. 2 is a first schematic diagram of an oscillation circuit according to an embodiment of the present disclosure. Fig. 3 is a second schematic diagram of an oscillation circuit according to an embodiment of the present application. The oscillating circuit may be an LC oscillating circuit, may be a two-wire LC oscillating circuit as shown in fig. 2, may also be a three-wire LC oscillating circuit as shown in fig. 2, and may also be another LC oscillating circuit, and the LC oscillating circuit may include an LC circuit and a resonant circuit, and the LC circuit may be the LC circuit shown in the above figure, and when the inductance value changes, the resonant circuit may determine the oscillating frequency, so that the outside determines the liquid level information in the container according to the changed oscillating frequency.

Specifically, when liquid is injected into the container, as the liquid level increases, the floating member 121 is subjected to buoyancy and moves along the guide rod 11 toward the first inner wall 141 along with the rising of the liquid, and since the magnetic member 122 is fixedly connected with the floating member 121, the magnetic member 122 is far away from the inductance coil 131, so that the inductance in the inductance coil increases, according to the formula of the resonance frequency:

when the inductance L becomes larger, the resonant frequency determined by the resonant circuit decreases, and along with the continuous change of the position of the magnetic member 122, the resonant circuit may determine a plurality of frequency f values, each f value may correspond to a position of the magnetic member 122, similarly, when liquid is discharged from the container, along with the decrease of the liquid level, the floating member 121 moves along the guide rod 11 toward the second inner wall 142 along with the decrease of the liquid level, and when the magnetic member 122 is close to the inductance coil 131, the inductance in the inductance coil may be decreased, according to the resonant frequency formula:

as the inductance L becomes smaller, the resonant frequency determined by the resonant circuit becomes larger and the resonant circuit may determine a plurality of frequency f values, each of which may correspond to a location of the magnetic member 122. After the oscillating circuit obtains the frequency f value related to the liquid level, the outside can control the liquid pump to be started or stopped according to the frequency f.

Fig. 1 to 4 are shown, and fig. 4 is a schematic structural diagram of the liquid pump according to the embodiment of the present application. The liquid pump 20 includes a pump body 21 and the liquid level detection device 10, the pump body 21 has a pump cavity 22, the oscillation circuit 13 and the guide rod 11 are fixedly disposed in the pump body 21, and the float device 12 is accommodated in the pump cavity 22. The float means 12 will rest at the bottom of the pump chamber 22 when there is no liquid in the pump chamber 22 and will float with the liquid when there is liquid, so that when the liquid level in the pump chamber 22 changes, the float means 12 slides along the guide rod 11, thereby changing the distance from the oscillating circuit 13 arranged at the end of the guide rod 11, and the oscillating circuit 13 determines the information on the liquid level in the pump chamber 22 by sensing the change in position of the float means 12. The liquid level detection function of the liquid pump is realized, so that the liquid pump is controlled to work according to the liquid level of the liquid pump, for example, the liquid pump is started and stopped, and the drainage noise of the liquid pump in a water-gas mixed state can be reduced or eliminated.

The liquid pump 20 can be applied to a laundry device for water inlet or water outlet of the laundry device, the liquid pump 20 is provided with a water inlet 201 and a water outlet 202, the water inlet 201 can be connected with a drain pipe of the laundry device connected with an inner cylinder, the water outlet 202 can be connected with a drain pipe of the laundry device communicated with the outside, and the liquid pump 20 can drain the washing water in the inner cylinder of the laundry device out of the laundry device.

The liquid pump 20 may be an alternating current drain pump, and the liquid pump 20 may include an impeller assembly 23, the impeller assembly 23 may be driven by a motor, and the impeller assembly 23 may discharge water from an inner tub of the washing machine to the outside of the washing machine when rotating. Specifically, the principle of the ac drainage pump is that an ac permanent magnet motor is installed in a cavity and controlled by a computer-controlled device, when a 220V power supply is turned on, the impeller assembly 23 stops rotating, when the 220V power supply is turned off, if a large amount of washing water is in a washing drum, the pump cavity 22 of a liquid pump 20 connected with the washing drum is filled with the washing water, at this time, the impeller of the impeller assembly 23 is completely immersed in the washing water, the noise is low in the rotating process, when the washing water in the washing drum is about to be emptied or is emptied, the washing water in the pump cavity 22 of the liquid pump 20 connected with the washing drum is less than enough to fill the pump cavity 22, at this time, the impeller of the impeller assembly 23 cannot be completely immersed in the washing water, and is in a semi-water and semi-gas state, the impeller beats the water surface during the rotating process, and a large noise is easily generated, therefore, the starting and stopping timing of the liquid pump 20 is very important, by arranging the liquid level detection device 10 in the pump cavity 22 of the liquid pump 20, and when the liquid pump works in the drainage stage, the position relationship between the washing water level of the impeller of the cavity and the washing water level of the washing water obtained by the liquid level information obtained by the liquid level detection device is judged. And the liquid pump is electrically controlled to start and stop according to the position relation.

Specifically, when liquid is injected into the container, as the liquid level increases, the floating member 121 is subjected to buoyancy and rises along the guide rod 11 along with the rise of the liquid, and since the magnetic member 122 is fixedly connected with the floating member 121, the magnetic member 122 is far away from the inductance coil of the oscillating circuit 13, so that the inductance in the inductance coil increases, according to the resonant frequency formula:

when inductance L becomes larger, the resonance frequency determined by the resonance circuit is reduced, along with the continuous change of the position of the magnetic member 122, the resonance circuit can determine a plurality of frequency f values, each f value can correspond to one position of the magnetic member 122, similarly, when liquid is discharged from the container, along with the reduction of the liquid level, the floating member 121 descends along the guide rod 11 along with the descending of the liquid, and when the magnetic member 122 is close to the inductance coil 131, the inductance in the inductance coil can be reduced, according to the resonance frequency formula:

as the inductance L becomes smaller, the resonant frequency determined by the resonant circuit becomes larger and the resonant circuit may determine a plurality of frequency f values, each of which may correspond to a location of the magnetic member 122. After the oscillating circuit obtains the frequency f value related to the liquid level, the processor of the laundry device can control the liquid pump to be started or stopped according to the frequency value f.

It should be noted that the number and the positions of the water inlets 201 and the water outlets 202 of the liquid pump 20 shown in fig. 4 are only exemplary, and a plurality of water inlets and/or a plurality of water outlets may also be provided according to actual requirements, and the positions of the water inlets 201 and the water outlets 202 may be adjusted according to actual requirements, so as to meet the requirements of different laundry devices on the liquid pump 20. It is understood that the structure of the impeller assembly 23 and the position relationship with the liquid level detection device 10 shown in fig. 4 are only exemplary and can be set according to actual requirements.

In some embodiments, the liquid level detecting device 10 may be disposed on the liquid pump 20 by injection molding, i.e. when the cavity of the liquid pump is injection molded, the oscillating circuit 13 is placed in an injection mold of the pump body 21 of the liquid pump 20, and then injection molding is performed.

An embodiment of the present application further provides a laundry device, please refer to fig. 4 and 5, and fig. 5 is a schematic structural diagram of the laundry device provided in the embodiment of the present application. The laundry device may be a household washing machine such as a drum washing machine, a pulsator washing machine, a duplex twin drum washing machine, etc. which requires washing using a liquid pump. Taking the laundry device 30 as an example of a drum washing machine, the laundry device includes a drum 310, when performing a washing function, water needs to be filled in the drum, when water in the drum needs to be drained out of the laundry device 30, the liquid pump 20 needs to drain the washing water in the drum out of the laundry device 30, for example, the water inlet 201 of the liquid pump is communicated with the drum 310 of the laundry device through a drain pipe 301, the water outlet 202 of the liquid pump is communicated with the outside of the laundry device 30 through a drain pipe 302, the laundry device 30 further includes a processor, the processor is electrically connected to the oscillation circuit 13 of the liquid pump 20, and the processor controls the operation of the liquid pump, in some embodiments, the oscillation circuit 13 may be electrically connected to the power circuit of the liquid pump 20, and the power circuit of the liquid pump 20 may provide power to the oscillation circuit 13.

The processor of the laundry device 30 may detect the frequency of the oscillation circuit 13 in real time, and determine the level of the liquid in the pump cavity of the liquid pump 20 according to the change of the frequency, so as to control the start and stop of the liquid pump 20. 1.3 after the washing machine is powered on and a program is selected to be started, in a specific application scenario, during the working process of the washing device 30, washing water in the drum 310 is in a direct connection relationship with the liquid pump 20, during the water filling process of the liquid pump 20, the floating member 121 and the magnetic member 122 in the pump chamber of the liquid pump move upwards along the guide rod 11 under the influence of self buoyancy, the processor can detect increasingly larger f1, f2 and f3 \8230, frequency values of \8230fNcan be stored in advance through experiments, the mapping relationship corresponding to each frequency value and the specific position relationship can be stored in advance, the specific position of the floating member 121 on the guide rod 11 can be determined through detecting the frequency values, and further liquid level information of the liquid pump can be obtained, similarly, during the outward water draining process of the liquid pump 20, the frequency values 121 and the magnetic member 122 in the pump chamber of the liquid pump move downwards along the guide rod 11 under the influence of self buoyancy, the processor can detect increasingly smaller fN \30, the frequency values of f3, f2 and the frequency values and the magnetic member 122 can be stored in advance, and further the liquid level information of the liquid pump can be obtained through the application of the liquid pump 30.

In order to avoid the impeller assembly 23 from generating large noise when rotating in the half-water half-gas state, a mapping relationship between the impeller assembly and the liquid level may be preset through experiments, for example, when the washing water in the pump chamber reaches a preset liquid level, the washing water in the pump chamber just submerges all the impellers of the impeller assembly 23, if the processor of the laundry device 30 detects that the frequency is gradually reduced, it indicates that the liquid level in the liquid pump 20 is reduced, and when a frequency value corresponding to the preset liquid level is detected, the impeller assembly 23 is controlled to stop rotating.

In some embodiments, in order to avoid time delay of the signal and inertia of the impeller after the command for controlling the impeller assembly 23 to stop rotating is sent, a command may be sent to the liquid pump when the impeller assembly 23 is about to expose out of the water surface, for example, the preset liquid level is not the liquid level at which the washing water just passes through the impeller of the impeller assembly 23, but the liquid level is a little higher than the liquid level at which the washing water just passes through the impeller assembly 23, the liquid level in the liquid pump 20 is dropping, and if a frequency value corresponding to the preset liquid level is detected, the impeller assembly 23 is controlled to stop rotating.

In some embodiments, predetermine the liquid level and still can be the liquid level of other positions, and the user can also include a plurality of liquid levels according to the impeller noise size setting of actual experiment predetermines the position of liquid level, predetermines the liquid level, for example first liquid level, second liquid level and third liquid level etc. each liquid level corresponds the relation of impeller and washing water, and the user can set up according to actual demand.

In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

In the description of the present application, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or as implying a number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features.

The liquid level detection device, the liquid pump and the laundry device provided in the embodiments of the present application are described in detail above, and specific examples are applied herein to explain the principles and embodiments of the present application, and the description of the embodiments is only used to help understand the method and the core idea of the present application; meanwhile, for those skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims (10)

1. A liquid level detection apparatus, characterized in that the liquid level detection apparatus comprises: the liquid level sensor comprises a guide rod, a floating device and an oscillating circuit, wherein the oscillating circuit and the guide rod can be fixedly arranged in a container, the guide rod and the floating device can be arranged in the container, the floating device is in sliding connection with the guide rod, and the oscillating circuit is used for sensing the position change of the floating device so as to determine the liquid level information of liquid in the container.

2. The liquid level detection device according to claim 1, wherein the float device comprises a float member and a magnetic member, the float member and the magnetic member are fixedly connected, and the float member and/or the magnetic member are/is slidably connected with the guide rod.

3. The fluid level detection apparatus of claim 1, wherein the tank circuit is disposed at an end of the guide bar.

4. The liquid level detection device according to claim 3, wherein two ends of the guide rod are respectively connected with two inner walls of the container, which are oppositely arranged.

5. A liquid level detection apparatus as claimed in claim 3 wherein the tank circuit comprises an inductor and a capacitor, the inductor being disposed around an end of the guide bar.

6. A liquid level detection device as claimed in any one of claims 1 to 5, wherein the tank is adapted to be provided by injection moulding.

7. A liquid pump comprising a pump body having a pump chamber, and the liquid level detection device as defined in any one of claims 1 to 6, wherein the oscillating circuit and the guide rod are fixedly disposed in the pump body, and the float device is accommodated in the pump chamber.

8. A laundry appliance comprising a liquid pump as claimed in claim 7.

9. A laundry appliance as claimed in claim 8, wherein the laundry appliance includes a processor, and the oscillating circuit is electrically connected to the processor.

10. A laundry appliance as claimed in claim 8, wherein the oscillating circuit is electrically connected to the liquid pump.

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