Submersible pump capable of accurately detecting water level

Abstract

The utility model provides a submersible pump which can ensure that the water for pets is fully sterilized and disinfected and can accurately detect water level and fully intelligently control the start and stop of a water pump. The submersible pump comprises an impeller pump and a water level sensing sheet, and the working state of the impeller pump is determined by a main control circuit by collecting the rotating speed of the impeller of the impeller pump and the capacitance value of the water level sensing sheet. The submersible pump adopts a double-detection mode to effectively determine whether the impeller pump needs to operate, effectively solves the problem that the impeller pump produces noise or is damaged due to idling in the case that the water container is empty or has little water, and solves the problem that the impeller pump automatically starts when the water level in the water container rises to a set height, which can avoid misjudgment caused by differences in water quality or the impeller being wrapped by foreign matters. In addition, the added water inlet guide plate can also play a role in efficiently and fully sterilizing the water flowing into the submersible pump before conveying the water, solving the problem of incomplete sterilization of water in the circulating system, and making the user use more environmentally friendly, safe and worry-free.

Description

TECHNICAL FIELD

[0001] The present application relates to a submersible pump, in particular to a small submersible pump placed in a pet water bowl. BACKGROUND

[0002] Nowadays, more and more people like to raise small animals, such as cats and dogs, and in order to provide water for these pets, people have designed several pet water bowls or water basins with beautiful appearance and providing flowing clean water.

[0003] Generally, such water bowls or water basins are composed of a water storage chamber, a water outlet pipe and a flow guide plate. A submersible pump is placed in the water storage chamber. The submersible pump lifts the clean water in the water storage chamber to the water outlet pipe above the flow guide plate through a pipeline. The water outlet pipe provides water for pets to drink. The water falling into the flow guide plate from the water outlet pipe is returned to the water storage chamber, and the cycle is repeated, so that the drinking water is always in a flowing state, thereby ensuring a high oxygen content in the drinking water.

[0004] In the prior art, the detection of the water level height (hereinafter referred to as water level height) in the water storage chamber (hereinafter referred to as water storage container in other documents of the present application) in the submersible pump used in the pet water bowl or water basin is usually detected by a capacitive sensor (hereinafter also referred to as water level sensing sheet). When the water level height reaches the upper limit of the water level (the water level height corresponding to the start of the normal operation of the submersible pump), the water level sensing sheet outputs a low capacitance value to the main control circuit of the submersible pump, and at this time the submersible pump starts to work. When the water level height falls to the lower limit of the water level (the water level height corresponding to the stop of the submersible pump to avoid the damage of the submersible pump caused by idling), the water level sensing sheet outputs a high capacitance value, and at this time the submersible pump stops working, and at the same time the water storage chamber is filled with water through an external water supply device.

[0005] Although the above scheme can enable the submersible pump to automatically start or stop, the above scheme still has the following defects:

[0006] 1. Capacitive detection is carried out by changing the medium outside the sensor. Different media cause different capacitance value change signals of the sensing sheet. If the water quality and the environment are relatively stable, the water pump can work stably in this way, but often in the process of use, the water quality is determined according to the use environment and the habit of the consumer and the use time, and there are many uncontrollable factors that can cause the capacitance value change range of the sensing sheet to be large, resulting in misjudgment of the working mode of the water pump.

[0007] Among them, the most common one is that the signal output value of the sensor is quite different when the same water pump and the same water level are in pure water, mineral water, tap water or seawater, for example, the water pump can work normally in seawater, but it may not work in pure water.

[0008] 2. If part of the outer wall of the sensor is covered with an object floating with liquid, the sensor may not output a stop signal when the water level in the water tank drops to the level at which the pump should stop. This will cause the water pump to run dry, which will not only generate high friction noise, but also easily damage the water pump.

[0009] 3. In addition, in the existing technology, the UV lamp in the submersible pump is exposed outside the submersible pump, and it does not provide a highly efficient and sufficient sterilization and disinfection effect on the water entering the submersible pump through the flow. Summary of the Invention

[0010] The technical problem to be solved by the present invention is to provide a submersible pump that can ensure that pet drinking water is fully sterilized and disinfected, and can intelligently control the start and stop of the water pump and accurately detect the water level.

[0011] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0012] The present invention relates to a submersible pump capable of accurately detecting water levels, placed in a water-filled container. It includes a housing, a water inlet on the front face of the housing, and an impeller pump disposed within the housing. The impeller pump is located on the right side of the housing's bottom plate, and a water level sensor is located on the left side of the impeller pump within the housing. The operating state of the impeller pump is determined by the main control circuit through the following method, based on the impeller rotation speed and the capacitance value of the water level sensor:

[0013] 1) After each power-on and automatic operation of the impeller pump, if the main control circuit of the submersible pump detects that the impeller speed has not reached the constant speed rotation state within a specified time, the main control circuit will cause the impeller pump to enter the standby state and instruct the water supply device set outside the submersible pump to inject water into the water container; the impeller pump will restart after a set standby time when the capacitance value of the water level sensor gradually changes from high to low; when the impeller speed decreases from high to low to the constant speed state and maintains the set delay time, the main control circuit will use the capacitance value of the water level sensor collected in real time as the start signal for the impeller pump to start running again in the standby state.

[0014] Alternatively, after each power-on of the submersible pump and automatic operation of the impeller pump, when the impeller speed decreases from high to low within a specified time to the aforementioned idle state and maintains the aforementioned delay time, the main control circuit uses the capacitance value of the water level sensor that is collected in real time as the start signal for the impeller pump to start running again when it is in standby mode.

[0015] 2) the impeller pump continuously runs, in the case that the capacitance value of the water level sensing sheet gradually changes from low to high, the main control circuit sends a stop working instruction to the impeller pump when the rotation speed of the impeller rises from the rotation speed corresponding to the idle rotation line to the set upper limit value of the rotation speed, the instruction is called the stop signal, and a signal of filling water into the water container is sent to the water supply device;

[0016] 3) in the process of water supply of the water supply device, when the capacitance value of the water level sensing sheet collected by the main control circuit is the same as the capacitance value corresponding to the start signal, a re-running signal is sent to the impeller pump;

[0017] 4) the impeller pump continuously runs, when the rotation speed of the impeller collected by the main control circuit rises to the rotation speed corresponding to the stop signal, a re-stop running signal is sent to the impeller pump, and the water supply device is instructed to fill water into the water container.

[0018] The housing is divided into a front cavity, a rear cavity and a rotor cavity located at the right side of the front cavity, the water inlet hole is communicated with the front cavity, the impeller of the impeller pump is installed in the impeller chamber of the rotor cavity, the impeller chamber and the rotor chamber of the rotor cavity are isolated by the water-tight front bearing, the rotating shaft of the rotor assembly arranged in the rotor chamber passes through the front bearing and is connected with the impeller, the water outlet hole of the submersible pump is arranged on the top plate of the housing and is communicated with the impeller chamber, and the stator assembly of the impeller pump and the circuit board carrying the main control circuit are installed in the rear cavity.

[0019] The UV lamp assembly is arranged in the space belonging to the rear cavity and located at the left side of the impeller chamber, the UV lamp assembly is composed of a light-transmitting partition plate, a sealing ring assembly, a UV lamp and a lamp holder arranged in sequence from front to back, a light-transmitting hole is arranged on the front wall plate of the rear cavity and corresponds to the UV lamp assembly, the light-transmitting partition plate is arranged at the rear side of the light-transmitting hole, and the sealing ring assembly water-tightly and sealingly isolates the light-transmitting hole, the light-transmitting partition plate and the UV lamp in sequence.

[0020] The housing comprises a front end cover, the water inlet hole is arranged on the front end cover, and a water inlet guide plate for completely irradiating the water entering the front cavity through the UV lamp and then flowing into the impeller chamber is arranged in the housing and is located behind the front end cover.

[0021] The water inlet guide plate is a multi-layer sandwich structure, which comprises a lamp cavity front baffle on the front side, a wheel cavity front baffle, a water guide groove, the front cavity formed behind the lamp cavity front baffle, a lamp-wheel water flow channel and a wheel cavity sealing plate arranged behind the wheel cavity front baffle; the lamp cavity front baffle is located in front of the light transmission hole, the front cavity is a gap formed between the lamp cavity front baffle and the light transmission hole through which the water must flow, the water guide groove is a vertical flow channel arranged between the lamp cavity front baffle and the wheel cavity front baffle for guiding the water into the front cavity, the wheel cavity sealing plate is arranged on the back side of the wheel cavity front baffle and tightly covers the impeller chamber, the lamp-wheel water flow channel is formed by the gap between the wheel cavity sealing plate and the wheel cavity front baffle and communicates with the front cavity, and a water passing hole is arranged on the wheel cavity sealing plate to communicate the lamp-wheel water flow channel with the impeller chamber.

[0022] A wireless charging receiving plate is arranged on the bottom plate in the shell and in the space belonging to the rear cavity below the rotor cavity.

[0023] A wireless transmitting module for supplying power to the wireless charging receiving plate is arranged outside the shell opposite to the wireless charging receiving plate.

[0024] An LED indicator light is arranged on the circuit board to indicate whether the submersible pump is powered on.

[0025] The front end cover comprises a front cover which can be buckled on the main body of the shell and a fence frame arranged in front of the front cover, the fence frame is filled with filter cotton, and a finger position for conveniently replacing the filter cotton is arranged on the top edge of the front side frame of the fence frame.

[0026] The stator assembly comprises a positioning support and separately arranged upper and lower stator windings, the positioning support is installed in the left space of the rear cavity, the upper and lower stator windings are wrapped on the outer peripheral wall of the rotor cavity in an opposite arrangement mode, and the rotor assembly installed in the rotor cavity is arranged in the magnetic field generated by the stator windings.

[0027] The submersible pump of the present application adopts a double detection mode to effectively determine whether the impeller pump needs to operate. It can effectively solve the problem of noise or damage caused by the impeller pump running empty in the case of no water or little water in the water container, and also solve the problem of automatic start of the impeller pump when the water level in the water container rises to a set height. It can avoid misjudgment caused by differences in water quality or impeller wrapped by foreign matters. In addition, the water inlet guide plate added in the present application can also play a role in efficiently and fully sterilizing the flowing water into the submersible pump before conveying it, solving the problem of incomplete sterilization of water quality in the circulating system, making the user use more environmentally friendly, safe and worry-free. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is a schematic diagram of the submersible pump of the present application.

[0029] Figure 2 Fig. 1 is a perspective view of the submersible pump of the present application. Figure 1 Fig. 2 is a schematic view of the submersible pump of Fig. 1 with the front end cover removed.

[0030] Figure 3 Fig. 3 is a schematic view of the submersible pump of Fig. 1 with the front end cover, the water inlet guide plate and the main body of the housing separated. Figure 1 Fig. 4 is a schematic view of the submersible pump of Fig. 1 with the front end cover, the water inlet guide plate and the main body of the housing separated.

[0031] Figure 4 Fig. 5 is an exploded schematic view of the submersible pump of Fig. 1. Figure 1 Fig. 6 is a schematic view of the submersible pump of Fig. 1 in cross-section along the A-A axis.

[0032] Figure 5 Fig. 7 is a schematic view of the submersible pump of Fig. 1 in cross-section along the B-B axis. Figure 1 Fig. 8 is a schematic view of the submersible pump of Fig. 1 in cross-section along the C-C axis.

[0033] Figure 6 Fig. 9 is a schematic view of the submersible pump of Fig. 1 in cross-section along the D-D axis. Figure 1 Fig. 10 is a schematic view of the submersible pump of Fig. 1 in cross-section along the E-E axis.

[0034] Figure 7 Fig. 11 is a schematic view of the water inlet guide plate of the submersible pump of Fig. 1. Figure 2 Fig. 12 is a schematic view of the water inlet guide plate of the submersible pump of Fig. 1.

[0035] Figure 8 Fig. 13 is a schematic view of the water inlet guide plate of the submersible pump of Fig. 1. Figure 7 Fig. 14 is a schematic view of the water inlet guide plate of the submersible pump of Fig. 1.

[0036] Figure 9 Fig. 15 is a schematic view of the water inlet guide plate of the submersible pump of Fig. 1. Figure 7 Fig. 16 is a schematic view of the water inlet guide plate of the submersible pump of Fig. 1.

[0037] Figure 10 Fig. 17 is a schematic view of the water inlet guide plate of the submersible pump of Fig. 1. Figure 8 Fig. 18 is a schematic view of the water inlet guide plate of the submersible pump of Fig. 1.

[0038] Figure 11 Fig. 19 is a schematic view of the water inlet guide plate of the submersible pump of Fig. 1.

[0039] The reference signs are as follows:

[0040] The shell 1, the front end cover 11, the front cover 12, the fence frame 13, the filter cotton 14, the finger position 15, the water inlet hole 16, the main body 2, the front cavity 21, the rear cavity 22, the circuit board 23, the wireless charging module 24, the rotor cavity 25, the impeller chamber 251, the rotor chamber 252, the UV lamp assembly 3, the light transmission partition plate 31, the sealing ring assembly 32, the UV lamp 33, the lamp holder 34, the light transmission hole 35, the mounting position 36, the water inlet flow guide plate 4, the lamp cavity front baffle 41, the wheel cavity front baffle 42, the water guide groove 43, the groove wall plate 431, the water flow passage between the lamp wheel 44, the wheel cavity sealing plate 45, the water passing hole 46, the annular sealing rubber ring 47, the surrounding wall plate 48, the water outlet hole 5, the rear cover 6, the small transparent area 61, the LED indicator light 62, the impeller pump 7, the impeller 71, the stator assembly 72, the positioning support 721, the upper stator winding 722, the lower stator winding 723, the rotor assembly 73, the rotating shaft 731, the front bearing 732, the rear bearing 733, the rear bearing sleeve 734, the rotor 735, the water level sensor 8, the submersible pump 9. DETAILED DESCRIPTION

[0041] The submersible pump 9 of the application can accurately detect the water level. It is a small DC pump placed in the water storage container. It is particularly applied to the pet water dispenser with the appearance of an artware. The water storage can be pure water, tap water or mineral water. The function of the submersible pump 9 is to lift and pump out the water in the water storage container, so that the pet can easily drink the water. At the same time, it promotes the continuous circulation of the water storage to ensure a high oxygen content in the water.

[0042] The submersible pump 9 of the application is submerged in the water storage container of the pet water dispenser. After each power-on (each power-on refers to turning on the pet water dispenser again after turning off the pet water dispenser last time and connecting the power supply of the submersible pump 9), the main control circuit of the submersible pump 9 can automatically determine the water level in the water storage container according to the double-mode detection mode set in the submersible pump 9 and automatically send an opening or closing instruction to the impeller pump 7 of the submersible pump 9.

[0043] The double-mode detection mode is that the main control circuit judges according to the rotating speed of the impeller 71 of the impeller pump 7 and the capacitance value of the water level sensor 8 set in the water storage container. The advantage of this double-mode detection mode is that:

[0044] 1) Avoiding the main control circuit from making a false determination of the water level in the water storage container due to the change of water quality when only using the water level sensor 8.

[0045] The water level sensor 8 is used for detection, and its disadvantage is that the capacitance detection is based on the change of the medium outside the water level sensor 8 (referring to the change of TD value in the medium, TD refers to the ion concentration in water) to judge the change of the capacitance value of the sensing sheet inside the water level sensor 8 to output an electric signal. If the water quality and the environment (referring to the state of the surface of the water level sensing sheet, such as whether there are fungi or attachments, and the environment difference will affect the capacitance sensing value) are relatively stable, the submersible pump 9 works relatively stably by using this detection method, but in the use process, the water quality is related to the habit of the consumer and the use time, and there are many uncontrollable factors to make the capacitance value of the sensing sheet change in a large range, resulting in misjudgment of the water level height in the water container, and the submersible pump 9 cannot work normally in the submersible environment.

[0046] For example, for the same water pump and the same water level, when the water medium is pure water, mineral water, tap water or seawater, the difference of the related signal value detected by the water level sensor 8 is very large. In addition, when the water level in the water container drops to the water level at which the submersible pump 9 should stop (to avoid the water level drop to expose the impeller pump 7 of the submersible pump 9 to the outside and idle), the water level sensor 8 may be wrapped by an object with liquid floating on the outer wall to cause detection error, so that the submersible pump 9 cannot work in the submersible state and the impeller pump 7 idles to produce noise or is damaged.

[0047] 2) Avoid the defect that the main control circuit cannot automatically start when the water level in the water container rises to the normal state in the submersible pump 9 with the rotation speed detection protection device for preventing the impeller 71 from idling.

[0048] The submersible pump 9 with the rotation speed detection device is used for detection, and its disadvantage is that when the water level in the water container drops to the set height, the main control circuit of the submersible pump 9 detects that the rotation speed of the impeller 71 rises to the set value, and the main control circuit sends a command to stop the rotation of the impeller pump 7. At this time, new water is added to the water container, and when the water level in the water container rises to the normal operation water level (that is, the water level flows over the highest point of the impeller 71), the rotation speed detection device cannot detect the water level at this time. At this time, manual intervention or intermittent start of the impeller pump 7 after shutdown is required to obtain the rotation speed signal.

[0049] The manual intervention (that is, manual start) needs to configure a manual start circuit structure, and cannot be an intelligent product due to the inability to start intelligently.

[0050] The intermittent start method will make the impeller pump 7 frequently start and stop, and the impeller pump 7 will idle and produce noise when the water level does not reach the normal operation water level, and the submersible pump 9 will be damaged if the complete idling time is too long.

[0051] like Figure 1 As shown in Figure 6, the submersible pump 9 of the present invention includes a housing 1, an impeller pump 7 and a water level sensor 8 (also called a water level sensor plate) disposed in the housing 1, a UV lamp assembly 3 (also called an ultraviolet disinfection assembly) that can completely disinfect and sterilize the water entering the submersible pump 9, an inlet guide plate 4 that guides the incoming water through a set flow channel, is irradiated by the UV lamp assembly 3, and is pumped out by the impeller pump 7, a main control circuit mounted on a circuit board 23 that controls the operation or stop of the impeller pump 7, and a wireless charging module that increases the power of the main control circuit and the impeller pump 7.

[0052] I. Shell 1

[0053] It is assembled from a front cover 11, a main body 2, and a rear cover 6.

[0054] 1. Front cover 11

[0055] The front cover 11 includes a front cover 12 that can be snapped onto the front end face of the housing 1 body 2 and a grille frame 13 disposed on the front side of the front cover 12. Figure 1 Taking the paper orientation as an example (left front is front, right back is back, left top is left, right bottom is right, the same below), the fence frame 13 is filled with filter cotton 14 to purify the stored water. The top edge of the front frame of the fence frame 13 is provided with a finger position 15 for easy replacement of the filter cotton 14. The front cover 12 is provided with a water inlet hole 16 to introduce water from the water container into the main body 2. The stored water enters the main body 2 sequentially through the fence, the filter cotton 14 and the water inlet hole 16.

[0056] 2. Main body 2, impeller pump 7, water level sensor 8, and wireless charging module

[0057] It has a rectangular shape and is divided into multiple isolated spaces, namely the front cavity 21, the rear cavity 22 and the rotor cavity 25.

[0058] 1) Anterior cavity 21

[0059] Water entering the main body 2 through the water inlet 16 must pass through a cavity located on the front left side of the main body 2.

[0060] 2) Postcavity 22

[0061] Located after the front cavity 21, the UV lamp assembly 3, the stator assembly 72 of the impeller pump 7, the circuit board 23, and the wireless charging receiver board in the wireless charging module are installed in the rear cavity 22, which is water-sealed to separate the rear cavity 22 from the front cavity 21 and the rotor cavity 25.

[0062] The water level sensor 8 is installed in the rear cavity 22 at a position slightly to the left; the wireless charging receiver board is installed in the gap on the inner surface of the bottom plate of the main body 2 belonging to the rear cavity 22.

[0063] The wireless transmitting module for powering the wireless charging receiving plate is arranged under the bottom plate of the shell 1, which is fixed on the bottom plate of the shell 1 through a water-tight structure, and the wireless transmitting module and the wireless charging receiving plate are charged through electromagnetic coupling in the prior art. The working mode is that the wireless transmitting module is turned on at the same time when the submersible pump 9 is powered on each time.

[0064] 3) rotor cavity 25

[0065] The impeller pump 7 of the submersible pump 9 is installed in the rotor cavity 25 located on the right side of the front cavity 21 and extending backward to occupy part of the space of the rear cavity 22.

[0066] The rotor cavity 25 is divided into an impeller chamber 251 and a rotor chamber 252 from front to back, the impeller 71 and the rotor assembly 73 of the impeller pump 7 are respectively installed in the impeller chamber 251 and the rotor chamber 252, the impeller chamber 251 and the rotor chamber 252 are isolated by a water-tight front bearing 732, the front end of the rotating shaft 731 of the rotor assembly 73 passes through the front bearing 732 and is connected with the impeller 71, and a rear bearing 733 and a rear bearing sleeve 734 are arranged at the rear part of the rotor chamber 252 to allow the rear end of the rotating shaft 731 to be arranged therein. The impeller chamber 251 and the rotor chamber 252 are sealed and separated, which can effectively prevent impurities in the water from entering the rotor chamber 252, prevent the phenomenon that the open rotor assembly 73 in the prior art is easily blocked by foreign matters, and effectively improve the operation reliability of the impeller pump 7.

[0067] The impeller chamber 251 is communicated with the front cavity 21 through a directional water flow passage arranged on the water inlet guide plate 4.

[0068] The stator assembly 72 includes a positioning support 721 and separately arranged upper and lower stator windings 722 and 723, the positioning support 721 is installed in the space on the left side of the rear cavity 22, the upper and lower stator windings 722 and 723 are wrapped on the outer peripheral wall of the rotor chamber 252 in an opposite manner, and the rotor assembly 73 installed in the rotor chamber 252 is arranged in the magnetic field generated by the stator windings.

[0069] The upper and lower stator windings 722 and 723 are respectively electrically connected with the main control circuit, are energized under the control of the main control circuit, and generate a magnetic field, the rotor assembly 73 with a permanent magnet rotates under the action of the magnetic field and drives the impeller 71 to rotate, so that the water in the impeller chamber 251 is sprayed out of the water outlet hole 5 arranged on the top plate of the main body 2.

[0070] 3、rear cover 6

[0071] A small transparent area 61 is provided on the rear cover 6 to transmit the light generated by the LED indicator lamp inserted on the circuit board 23 out of the rear cover 6. The advantage of this arrangement is that the indicator lamp is not exposed, the appearance is neat and the installation is convenient.

[0072] The LED indicator lamp has the following functions:

[0073] When the impeller pump 7 is stopped, the indicator lamp is red and the UV lamp 33 of the UV lamp assembly 3 is turned off. When water is added to the water container and the water level rises to the normal operation of the impeller pump 7, the indicator lamp changes from red to green and the UV lamp 33 is turned on. When the water is insufficient, the indicator lamp is red and flashes.

[0074] II. UV lamp assembly 3

[0075] The UV lamp assembly 3 is arranged in the space belonging to the rear cavity 22 on the left side of the impeller chamber 251 and is composed of a light-transmitting partition plate 31, a sealing ring assembly 32, a UV lamp 33 and a lamp holder 34 arranged in front of the rear.

[0076] A light-transmitting hole 35 is provided on the front wall plate of the rear cavity 22 which separates the front cavity 21 from the rear cavity 22. An installation position 36 for the light-transmitting partition plate 31 (the area of the light-transmitting partition plate 31 is larger than that of the light-transmitting hole 35 and is sealed on the light-transmitting hole 35) is provided on the rear side of the front wall plate and located at the periphery of the light-transmitting hole 35. A sealing ring assembly 32 is provided on the installation position 36 to prevent water in the front cavity 21 from entering the rear cavity 22 through the light-transmitting hole 35.

[0077] The lamp holder 34 is arranged behind the light-transmitting partition plate 31 and the UV lamp is installed on the lamp holder 34 and electrically connected with the main control circuit.

[0078] When the flowing water entering the main body 2 through the water inlet hole 16 flows into the front cavity 21 in front of the light-transmitting partition plate 31, the ultraviolet light generated by the UV lamp 33 transmits through the light-transmitting partition plate 31 to fully irradiate the flowing water.

[0079] III. Water inlet guide plate 4

[0080] Its function is to make the flowing water entering the main body 2 through the water inlet hole 16 first pass through the front cavity 21 directly opposite the UV lamp 33, and then enter the impeller chamber 251 of the rotor cavity 25 according to the set flowing water channel. It is installed in the housing 1 before the UV lamp assembly 3 and the rotor assembly 73.

[0081] As Figure 7As shown in Fig. 11, the water inlet guide plate 4 of the present application is preferably a multi-layered sandwich structure integrally formed. It comprises a front side of lamp cavity front baffle 41, wheel cavity front baffle 42, water guide groove 43, the front cavity 21 (also referred to as the lamp cavity) formed behind the lamp cavity front baffle 41, the water flow channel between the lamp and the wheel 44 (i.e. the aforementioned directional water flow channel) and a rear side of the wheel cavity sealing plate 45.

[0082] 1. The lamp cavity front baffle 41, the wheel cavity front baffle 42 and the water guide groove 43

[0083] The lamp cavity front baffle 41 and the wheel cavity front baffle 42 are in the same plane and are arranged separately, which is perpendicular to the bottom plate surface of the main body 2. The lamp cavity front baffle 41 is directly opposite the UV lamp assembly 3 (i.e. the lamp cavity front baffle 41 is located in front of the light transmission hole 35), and the wheel cavity front baffle 42 is directly opposite the rotor assembly 73. The two plates are arranged to avoid water sucked into the main body 2 through the water inlet hole 16 from directly entering the impeller chamber 251.

[0084] Part of the periphery of the lamp cavity front baffle 41 and the wheel cavity front baffle 42 is respectively provided with a rearwardly extending surrounding wall plate 48. The gap between the surrounding wall plate 48 of the lamp cavity front baffle 41 and the inner side and the front wall plate of the rear cavity 22 constitutes the front cavity 21.

[0085] The water guide groove 43 is vertically arranged and located between the lamp cavity front baffle 41 and the wheel cavity front baffle 42. The height of the upper edge of the groove wall plate 431 of the water guide groove 43, which is connected to the lamp cavity front baffle 41, is slightly lower than the height of the lamp cavity front baffle 41. The water flowing into the main body 2 spreads upward before the water inlet guide plate 4 and flows into the front cavity 21 through the top edge of the groove wall plate 431 of the water guide groove 43, which is connected to the lamp cavity front baffle 41. The water flowing into the front cavity 21 is irradiated by the UV lamp 33 and then enters the impeller chamber 251 through the water flow channel between the lamp and the wheel 44 (Note: The front cavity 21 constitutes a special cavity for fully and efficiently sterilizing and disinfecting the water flowing into it).

[0086] 2. The water flow channel between the lamp and the wheel 44 and the wheel cavity sealing plate 45

[0087] The wheel cavity sealing plate 45 is arranged opposite to the wheel cavity front baffle 42 and is spaced apart from it. The wheel cavity sealing plate 45 is rectangular. When the water inlet guide plate 4 is assembled on the main body 2, the wheel cavity sealing plate 45 will be buckled on the front end surface of the impeller chamber 251. An annular sealing rubber ring 47 is further arranged on the inner side of the wheel cavity sealing plate 45 to prevent water from seeping into the impeller chamber 251 through the periphery of the wheel cavity sealing plate 45. The outer diameter of the annular sealing rubber ring 47 is slightly larger than the inner diameter of the impeller chamber 251.

[0088] The water flow channel between the lamp and the wheel 44 is formed by the gap between the groove wall plate 431 of the water guide groove, the wheel cavity sealing plate 45 and the wheel cavity front baffle 42 and is located in the lower region of the inner side of the water inlet guide plate 4. The water flow channel between the lamp and the wheel 44 is communicated with the front cavity 21.

[0089] The water flow passage 44 between the light wheels and the impeller chamber 251 are communicated through the water passing hole 46 on the sealing wheel cavity plate 45, that is, the water flowing through the water flow passage 44 from the front cavity 21 enters the impeller chamber 251 through the water passing hole 46.

[0090] Four, the working state of the impeller pump 7 is determined by the main control circuit by collecting the rotating speed of the impeller 71 of the impeller pump 7 and the capacitance value of the water level sensing sheet according to the following method:

[0091] 1. After the submersible pump 9 is powered on and automatically runs the impeller pump 7 each time, whether the impeller pump 7 is on standby or continuously running, there are two determination methods:

[0092] 1) If the main control circuit of the submersible pump 9 monitors that the rotating speed of the impeller 71 does not reach the constant speed rotating state of the impeller line within a specified time (there are roughly two cases that do not reach: one is that the water container has no water or less water, and the rotating speed will be higher than the normal rotating speed of the impeller pump 7; the second is that when the impeller 71 is wrapped by some sundries, the rotating speed of the impeller 71 will be lower than the normal rotating speed), the main control circuit makes the impeller pump 7 enter the standby state and instructs the water supply device outside the submersible pump 9 to inject water into the water container.

[0093] After that, the impeller pump 7 is started to run again when the capacitance value of the water level sensing sheet gradually changes from high to low (which means that the water level is rising), and when the rotating speed of the impeller 71 reaches the rotating speed corresponding to the impeller line and maintains the set delay time, the impeller pump 7 does not stop, at this time, the main control circuit takes the capacitance value of the water level sensing sheet as the starting signal for the impeller pump 7 in standby state to run again.

[0094] The purpose of setting the above delay time is to make the water level in the water container slightly higher than the impeller line, and the specific height depends on the water level rising rate when the water supply device injects water into the water container. Because the water in the water container is not completely consumed at one time, it is easy to breed bacteria or larvae if the storage time is too long; if it is too low, it may cause the impeller pump 7 to repeatedly start or stop. That is, when there are many pets, the single water consumption is large, and the actual water level is higher than the impeller line. The difference is larger, and vice versa.

[0095] Note:

[0096] Constant speed: indicates the rotating speed of the impeller 71 corresponding to the moment when the water level in the water container just overflows the highest point of the impeller 71 of the impeller pump 7. Because the impeller 71 is completely immersed in water at this time, the resistance of the impeller 71 rotating in water is constant.

[0097] The full wheel line state refers to: the water level line corresponding to the highest point of the impeller 71 at a constant speed is called the full wheel line, and the rotating speed state of the impeller 71 at the full wheel line water level is called the full wheel line state, which means that the impeller pump 7 is not in the idling state.

[0098] The duration time: the change rate of the influence of the water level rising speed on the rotating speed of the impeller 71 determines, for example, if the water level rising speed is fast, the duration time can be short, and if the water level rising speed is slow, the duration time can be long.

[0099] The specified time: a conservative limit time is set according to whether the impeller pump 7 idles without being damaged, which can be a second-level time or a minute-level time.

[0100] The machine setting time: it is determined according to the volume of the water container and the water supply flow rate of the water supply device per unit time.

[0101] 2) When the rotating speed of the impeller 71 reaches the full wheel line state within the specified time and maintains the delay time, the impeller pump 7 does not stop, and at this time, the main control circuit takes the capacitance value of the water level sensing sheet collected in real time as the start signal of the impeller pump 7 in the standby state.

[0102] 2, The continuously running impeller pump 7, in the case that the capacitance value of the water level sensing sheet gradually changes from low to high (the capacitance value of shallow water is high, and the capacitance value of full water is low), the main control circuit sends a stop working instruction to the impeller pump 7 when the rotating speed of the impeller 71 rises from the rotating speed corresponding to the full wheel line state to the set upper limit value of the speed, and at the same time, sends a signal to the water supply device to inject water into the water container.

[0103] The main control circuit takes the above-mentioned set upper limit value of the speed as the stop signal of the standby impeller pump 7.

[0104] 3, During the water supply process of the water supply device, when the capacitance value of the water level sensing sheet collected by the main control circuit is the same as the capacitance value corresponding to the start signal, a signal is sent to the impeller pump 7 to run again.

[0105] 4, The impeller pump 7 continuously runs, and when the rotating speed of the impeller 71 collected by the main control circuit rises to the rotating speed corresponding to the stop signal, a signal is sent to the impeller pump 7 to stop running again, and at the same time, the water supply device is instructed to inject water into the water container.

[0106] In the latter part of each running cycle of the submersible pump 9, the main control circuit sends a cyclic working instruction to the submersible pump 9 according to the above-mentioned working steps 2 to 4.

[0107] The above working mode of the present application, when the submersible pump 9 is powered on, the rotational speed of the impeller 71 reaches a constant value to obtain the corresponding capacitance value of the water level sensing sheet at this time, and this is used as the starting signal of the impeller pump 7 thereafter; when the rotational speed of the impeller 71 reaches the set upper limit value of the speed during the change of the capacitance value of the water level sensing sheet, the impeller pump 7 is stopped, and the upper limit value of the speed is set as the stop signal. The purpose of collecting the relevant parameters of the water level sensing sheet to start the impeller pump 7 and collecting the relevant parameters of the rotational speed of the impeller 71 to stop the impeller pump 7 is achieved.

[0108] The present application absorbs the advantages of the two detection methods, uses the capacitance type water level sensing sheet monitoring signal as the start-up instruction, so that the impeller pump 7 can automatically start when there is water, and uses the rotational speed monitoring signal of the impeller 71 to determine the stop of the impeller pump 7. In this way, false judgments caused by differences in water quality or foreign matter wrapping can be avoided.

[0109] The submersible pump 9 obtains power through the wireless charging module 14, the processor in the main control circuit confirms whether there is enough water in the water tank by monitoring the rotational speed and the capacitance value of the water level sensing sheet and through calculation, and then sends an instruction to the impeller pump 7 whether to continue working, and the UV lamp 33 works according to different working states of the impeller pump 7 (for example, the UV lamp 33 is on when the water pump is working normally, otherwise it is off).

[0110] When the impeller pump 7 is blocked and the rotational speed of the impeller 71 is lower than the set value, the main control circuit gives a stop instruction, and the LED indicator light gives an abnormal signal (such as red light display).

Claims

1. A submersible pump capable of accurately detecting water level, placed in a water container, comprising a housing (1), a water inlet (16) disposed on the front end face of the housing (1), and an impeller pump (7) disposed within the housing (1), characterized in that: The impeller pump (7) is located on the right side of the bottom plate of the housing (1); the housing (1) is divided into a front chamber (21), a rear chamber (22) and a rotor chamber (25) located to the right of the front chamber (21). The rear chamber (22) is water-sealed away from the front chamber (21) and the rotor chamber (25). A water level sensor is installed in the rear chamber (22). The working state of the impeller pump (7) is determined by the main control circuit by collecting the impeller speed of the impeller pump (7) and the capacitance value of the water level sensor according to the following method: 1) After each power-on of the submersible pump (9) and automatic operation of the impeller pump (7), if the main control circuit of the submersible pump (9) detects that the impeller speed has not reached the constant speed rotation state within a specified time, the main control circuit causes the impeller pump (7) to enter the standby state and instructs the water supply device set outside the submersible pump (9) to inject water into the water container; the impeller pump (7) restarts after a set standby time when the capacitance value of the water level sensor gradually changes from high to low. When the impeller speed decreases from high to low to the constant speed state and maintains the set delay time, the main control circuit uses the capacitance value of the water level sensor collected in real time as the start signal for the impeller pump (7) to start running again in the standby state. Alternatively, after each time the submersible pump (9) is powered on and the impeller pump (7) is automatically running, when the impeller speed decreases from high to low within a specified time to the aforementioned idle state and maintains the aforementioned delay time, the main control circuit will use the capacitance value of the water level sensor that is collected in real time as the start signal for the impeller pump (7) to start running again when it is in standby mode. 2) The impeller pump (7) continues to operate. When the capacitance value of the water level sensor gradually changes from low to high, the main control circuit sends a stop working command to the impeller pump (7) when the impeller speed rises from the speed corresponding to the idler state to the set upper speed limit. This command is called the stop signal. At the same time, it sends a signal to the water supply device to inject water into the water container. 3) During the water supply process of the water supply device, when the capacitance value of the water level sensor collected by the main control circuit is the same as the capacitance value corresponding to the start signal, a restart signal is sent to the impeller pump (7). 4) The impeller pump (7) continues to operate. When the impeller speed collected by the main control circuit rises to the speed corresponding to the stop signal, a signal to stop the operation of the impeller pump (7) is sent again, and at the same time, the water supply device is instructed to inject water into the water container.

2. The submersible pump capable of accurately detecting water level according to claim 1, characterized in that: The inlet hole (16) is connected to the front chamber (21). The impeller (71) of the impeller pump (7) is installed in the impeller chamber (251) of the rotor chamber (25). The impeller chamber (251) and the rotor chamber (252) of the rotor chamber (25) are isolated by a water-sealed front bearing (732). The shaft (731) of the rotor assembly (73) located in the rotor chamber (252) passes through the front bearing (732) and is connected to the impeller (71). The outlet hole (5) of the submersible pump (9) is located on the top plate of the housing (1) and is connected to the impeller chamber (251). The stator assembly (72) of the impeller pump (7) and the circuit board (23) carrying the main control circuit are installed in the rear chamber (22).

3. The submersible pump capable of accurately detecting water level according to claim 2, characterized in that: A UV lamp assembly (3) is provided in the space belonging to the rear cavity (22) on the left side of the impeller chamber (251). The UV lamp assembly (3) consists of a light-transmitting partition (31), a sealing ring assembly (32), a UV lamp (33), and a lamp holder (34) arranged sequentially from front to back. A light-transmitting hole (35) is provided on the front wall of the rear cavity (22) at a position corresponding to the UV lamp assembly (3). The light-transmitting partition (31) is located on the rear side of the light-transmitting hole (35). The sealing ring assembly (32) sequentially water-seals and isolates the light-transmitting hole (35), the light-transmitting partition (31), and the UV lamp (33).

4. The submersible pump capable of accurately detecting water level according to claim 3, characterized in that: The housing (1) includes a front cover (11), and the water inlet (16) is provided on the front cover (11). Inside the housing (1), after the front cover (11), there is a water inlet guide plate (4) that allows the water inlet sucked into the front cavity (21) through the water inlet (16) to be completely irradiated by a UV lamp (33) before flowing into the impeller chamber (251).

5. The submersible pump capable of accurately detecting water level according to claim 4, characterized in that: The water inlet guide plate (4) is a multi-layered sandwich structure, including a front lamp cavity baffle (41), a wheel cavity baffle (42), a water guide groove (43), a front cavity (21) formed after the front lamp cavity baffle (41), a water flow channel (44) between the lamp wheels, and a wheel sealing cavity plate (45) set after the wheel cavity baffle (42); the front lamp cavity baffle (41) is located in front of the light-transmitting hole (35), and the front cavity (21) is the gap through which the water must flow and is formed between the front lamp cavity baffle (41) and the light-transmitting hole (35); the water guide groove (43) 3) A vertical flow channel is set between the front baffle (41) of the lamp cavity and the front baffle (42) of the wheel cavity and is used to guide the water inlet to the front cavity (21); the sealing wheel cavity plate (45) is set behind the front baffle (42) of the wheel cavity and is sealed and covered on the impeller chamber (251); the water flow channel (44) between the lamp wheels is formed by the gap between the sealing wheel cavity plate (45) and the front baffle (42) of the wheel cavity and communicates with the front cavity (21); a water passage hole (46) is provided on the sealing wheel cavity plate (45) to communicate between the water flow channel (44) between the lamp wheels and the impeller chamber (251).

6. The submersible pump capable of accurately detecting water level according to claim 5, characterized in that: A wireless charging receiver board is provided on the bottom plate inside the housing (1) and in the space belonging to the rear cavity (22) below the rotor cavity (25).

7. The submersible pump capable of accurately detecting water level according to claim 6, characterized in that: A wireless transmitter module that can power the wireless charging receiver is provided outside the housing (1) opposite to the wireless charging receiver.

8. The submersible pump capable of accurately detecting water level according to claim 2, characterized in that: The circuit board (23) is provided with an LED indicator to show whether the submersible pump (9) is powered on.

9. The submersible pump capable of accurately detecting water level according to claim 7 or 8, characterized in that: The front cover (11) includes a front cover (12) that can be fastened to the main body (2) of the housing and a fence frame (13) disposed in front of the front cover (12). The fence frame (13) is filled with filter cotton (14), and a finger position (15) is provided on the top edge of the front side frame of the fence frame (13) for easy replacement of the filter cotton (14).

10. The submersible pump capable of accurately detecting water level according to claim 9, characterized in that: The stator assembly (72) includes a positioning bracket (721) and a separately arranged upper stator winding (722) and a lower stator winding (723). The positioning bracket (721) is installed in the left space of the rear cavity (22). The upper stator winding (722) and the lower stator winding (723) are arranged opposite to each other and wrapped around the outer peripheral wall of the rotor cavity (25). The rotor assembly (73) installed in the rotor cavity (25) is placed in the magnetic field generated by the stator winding.

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