CN214961852U

CN214961852U - Self-cleaning and automatic water changing pet water dispenser

Info

Publication number: CN214961852U
Application number: CN202121287687.3U
Authority: CN
Inventors: 秦晟
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-06-09
Filing date: 2021-06-09
Publication date: 2021-12-03
Anticipated expiration: 2031-06-09

Abstract

The utility model provides a pet water dispenser of automatically cleaning and automatic water changing, including organism, automatically cleaning structure and the automatic water changing structure. The pet water dispenser capable of cleaning and automatically changing water has simple structure and simple and convenient installation. The water bowl cleaning device can automatically clean the water bowl, can also drain sewage containing dust, pet hair and food residues, and can inject new purified water into the water bowl.

Description

Self-cleaning and automatic water changing pet water dispenser

Technical Field

The utility model relates to a pet drinking water's technical field, in particular to pet water dispenser of automatically cleaning and automatic water changing.

Background

Along with the improvement of living standard of people, more and more families for raising pets, cats, dogs and other pets as good partners in life of people, and the problems in the aspect of diet and health are more and more valued by people. The water source is indispensable in food, and people need regularly change clean drinking water for the pet. With the development of economy and technology, automatic feeding machines and pet water dispensers are available to liberate manpower.

As a result of the discovery that a slippery mucous layer always exists on the wall of a pet water bowl, it is known that this is actually a Bacterial biofilm (or Bacterial biofilm) that is a mass of Bacterial aggregated membrane-like material formed by bacteria adhering to a contact surface, secreting polysaccharide matrix, fibrin, lipoprotein, etc., and wrapping themselves around them. The bacterial biofilm is a life phenomenon that bacteria adapt to natural environment and are beneficial to living, and can continuously attract, breed and differentiate more bacteria. The bacterial biofilm on the wall of the water bowl for the pet is mostly formed by dust in the environment and bacteria accumulated in the mouth when the pet drinks water, and the source cannot be eradicated. The higher the temperature, the faster the bacterial biofilm growth.

Therefore, the stainless steel pet drinking bowl needs to be cleaned at least every day, and is not simply added with water, otherwise the bacterial content in water can be greatly increased, the drinking desire of the pet is slightly influenced, and even the pet suffers from dyspepsia, urinary system diseases and the like.

One of the common pet water dispensers at present adopts an inverted bucket, and when the water level in a drinking bowl is lower than a certain value, drinking water is supplemented by utilizing the action of gravity and air pressure; the other is to adopt a water circulation structure, the water in the water tank flows out in a fountain-like mode, a 'living water' vision is created to attract the pet to drink, actually, the water circulation is not a new water source, and even if some filter screens are added in the water circulation tank, the filtered dirt is still soaked in the water to pollute the water. The structure has obvious defects, the water circulation structure is complex, the water circulation structure has a plurality of dead angles, the water circulation structure is a hotbed for bacterial reproduction, and even if the water circulation structure is manually cleaned, the water circulation structure cannot be thoroughly cleaned due to the complex structure.

The common pet water dispensers in the prior art mainly realize the functions of supplementing water or attracting pets, and do not have the functions of self-cleaning and automatic water changing. If the pet owner is busy or even goes on a business trip, the water dispenser can not meet the requirement of a healthy water source basically.

Disclosure of Invention

The utility model aims at:

aiming at the defects of the prior art, the pet water dispenser with the self-cleaning and automatic water changing functions is provided, and the pet water dispenser is simple in structure and simple and convenient to install. The water bowl cleaning device can automatically clean the water bowl, can also drain sewage containing dust, pet hair and food residues, and can inject new purified water into the water bowl.

The purpose of the utility model can be realized by the following technical scheme:

a pet drinking machine with self-cleaning and automatic water changing functions comprises a machine body, a self-cleaning structure and an automatic water changing structure; the machine body comprises a water purifying cavity, a sewage cavity, a stainless steel pet drinking bowl and a controller; the self-cleaning structure comprises an ultrasonic transducer attached to the bottom of the stainless steel pet drinking bowl; the automatic water changing structure comprises a purified water injection structure and a sewage discharge structure; the purified water injection structure comprises a water pipe, a water pump or an electromagnetic valve and a water injection faucet which are sequentially communicated with the purified water cavity; the sewage discharge structure comprises a water outlet arranged at the bottom of the stainless steel pet drinking bowl and a drain pipe connected with the water outlet and the sewage cavity, wherein the drain pipe is bent downwards below the water outlet to form a U shape, penetrates into the sewage cavity from the bottom of the sewage cavity and is vertically arranged in the sewage cavity from bottom to top); in a preferred scheme, the water discharge pipe can be bent downwards below the water discharge port to form a U shape and then bent upwards to form an inverted U shape, the top of the inverted U-shaped section is higher than the top of the stainless steel pet drinking bowl, and then the water discharge pipe is bent downwards to form a U shape, penetrates into the sewage cavity from the bottom of the sewage cavity and is vertically arranged in the sewage cavity from bottom to top. The inverted U-shaped section of the drain pipe is also provided with a water bowl induction liquid level sensor for monitoring the water level of the stainless steel pet drinking bowl. The starting point of the inverted U-shaped section needs to be higher than the highest water level designed for the stainless steel pet drinking bowl by more than 2cm, so that enough space is provided for placing the water bowl induction liquid level sensor.

The sewage discharge structure further comprises an exhaust port arranged on the upper portion or the top of the sewage cavity, a one-way exhaust valve which is arranged outside the exhaust port and enables gas in the sewage cavity to only flow out but not flow in, and a vertical exhaust pipe arranged in the sewage cavity, wherein one end of an exhaust opening of the exhaust pipe is arranged on the upper portion of the sewage cavity, and the other end of the exhaust pipe penetrates out of the bottom of the sewage cavity and is connected with an air pump arranged below a bottom plate of the sewage cavity. In a certain preferred scheme, one-way discharge valve is one and adds the flexible sheet structure who establishes at sewage chamber gas vent top, flexible sheet structure only one side is fixed on sewage chamber top and its fixed connection department does not shelter from the sewage chamber gas vent.

The machine body also comprises a vertical equipment cavity clamped between the water purifying cavity and the sewage cavity, and the vertical equipment cavity is used for accommodating components which are higher than the stainless steel pet drinking bowl of the water purifying injection structure and the sewage discharge structure and are not arranged in the water purifying cavity and the sewage cavity; the water injection faucet is arranged above the stainless steel pet drinking bowl outside the vertical equipment cavity.

The machine body further comprises a transverse equipment cavity arranged below the water purification cavity, the sewage cavity and the stainless steel pet drinking bowl, and the transverse equipment cavity is used for containing parts which are lower than the water purification cavity, the sewage cavity and the stainless steel pet drinking bowl and used for containing the water purification injection structure and the sewage discharge structure.

The purified water injection structure also comprises a flowmeter arranged between the water pump or the electromagnetic valve and the water injection faucet.

And a filtering device is also arranged in the water purifying cavity.

An air pump exhaust pipe is further arranged on the air pump.

Still be equipped with at least one ultraviolet ray disinfection lamp in the vertical equipment cavity, the wall that vertical equipment cavity meets with water purification chamber, sewage chamber is transparent wall.

The upper portion in the vertical equipment cavity is equipped with the high level response level sensor who is used for monitoring sewage chamber high water level, and the lower part in the equipment cavity is equipped with the low level response level sensor who is used for monitoring water purification chamber low water level.

The controller is used for controlling the ultrasonic transducer, the water pump or the electromagnetic valve, the air pump, the flowmeter, the water bowl induction liquid level sensor, the high induction liquid level sensor, the low induction liquid level sensor and the ultraviolet disinfection lamp.

The tail end of the drain pipe, which is positioned at the upper part of the sewage cavity, is provided with a detachable filter head.

The tail end of the upper portion of the sewage cavity, where the exhaust pipe is located, is provided with a section of inverted U-shaped pipe section and a buoyancy valve, the main structure of the buoyancy valve is a cylinder cavity with upper and lower openings, the upper end of the cylinder cavity is communicated with the inverted U-shaped pipe section at the tail end of the exhaust pipe, the upper portion of the side wall of the cylinder cavity is provided with a plurality of through holes, and a floater which can block the inverted U-shaped pipe section and has a diameter larger than the lower opening of the cylinder cavity is arranged in the cylinder cavity.

The utility model has the advantages that:

1. can self-cleaning stainless steel pet drinking bowl, get rid of the adnexed bacterium biofilm of drinking bowl wall through the ultrasonic wave, the clearance is very effective.

2. Sewage containing dust, pet hair and food residues can be drained, the sewage is pumped by skillfully utilizing the principle of negative pressure, a water pump which is easy to block is not needed, the small water pump cannot treat the sewage with the hair, the food residues and possible solid particles, the internal structure of the water pump is complex, and bacteria are easy to breed; the design of the multi-section U-shaped section drain pipe is utilized, so that the water storage in the drain pipe is reduced as much as possible. Stainless steel pet water bowl adopts metal material, and induction type liquid level sensor can't be suitable for, and U type pipe installation induction type level sensor section is non-metal material, and because the linker principle, obtains the water level of water bowl through measuring U type pipe water level. Because the sewage outlet in the sewage cavity, namely the outlet of the drain pipe, is above the liquid level, sewage cannot flow back into the drinking bowl, the drinking bowl does not need complex water seal, and large-volume sewage is easier to drain away.

3. Fresh clean water can be poured into the drinking bowl instead of the traditional repeated circulation of "old water".

4. The water changing frequency and the cleaning frequency can be set by the controller. When the owner has high requirements on health, the water can be changed for cleaning every day for a plurality of times. When the owner goes on a business trip, the water can be changed for 1 time in a cleaning way every day, and the service time of one tank of purified water is prolonged.

5. Simple structure practices thrift the cost, and the installation is simple convenient, also is convenient for later stage maintenance and degree of depth washing, is convenient for produce, promote.

Drawings

Fig. 1 is a schematic view of the main structure of the present invention.

Fig. 2 is one of the schematic external views of the present invention.

Fig. 3 is a second external view of the present invention.

Fig. 4 is a schematic view of a partial structure of the present invention.

Fig. 5 is a second partial schematic view of the present invention.

Fig. 6 is a third schematic view of a partial structure of the present invention.

Fig. 7 is a fourth partial schematic view of the present invention.

Fig. 8 is a schematic view of a filter head according to the present invention.

Fig. 9 is a second schematic view of the filter head assembly of the present invention.

Figure 10 is a schematic view of one embodiment of the buoyancy valve assembly of the present invention.

Figure 11 is a second schematic view of the buoyancy valve member of the present invention.

Fig. 12 is a fifth partial schematic view of the present invention.

Wherein:

100. a body;

101. a water purifying cavity;

102. a sewage chamber;

103. stainless steel pet drinking bowl;

104. a controller;

105. a vertical equipment cavity;

106. a transverse equipment cavity;

107. a filtration device;

108. the water bowl senses the liquid level sensor;

109. an ultraviolet disinfection lamp;

110. a high level sensing level sensor;

111. a low level inductive level sensor;

112. an exhaust through hole;

201. an ultrasonic transducer;

311. a water pipe;

312. a water pump or a solenoid valve;

313. a water injection faucet;

314. a flow meter;

321. a water outlet;

322. a drain pipe;

323. an inverted U-shaped section;

324. an exhaust port;

325. a one-way exhaust valve;

326. an air exhaust pipe;

327. an air pump;

328. an air pump exhaust pipe;

329. a filter head;

330. an inverted U-shaped tube section;

331. a buoyancy valve;

332. a through hole;

333. a float.

Detailed Description

The invention will be further explained with reference to the drawings and the specific embodiments.

As shown in figure 1, the utility model provides a self-cleaning and automatic water-changing pet water dispenser, which comprises a body 100, a self-cleaning structure and an automatic water-changing structure. As shown in fig. 4, the body 100 includes a water purifying chamber 101, a sewage chamber 102, a stainless steel pet drinking bowl 103, and a controller 104. The self-cleaning structure includes an ultrasonic transducer 201 attached to the bottom of a stainless steel pet drinking bowl 103.

The automatic water changing structure comprises a purified water injection structure and a sewage discharge structure. As shown in fig. 4, the purified water injection structure includes a water pipe 311, a water pump or an electromagnetic valve 312, and a water injection faucet 313, which are sequentially connected to the purified water chamber 101. As shown in FIG. 6, the sewage draining structure comprises a draining port 321 arranged at the bottom of the stainless steel pet drinking bowl 103, and a draining pipe 322 connected with the draining port 321 and the sewage chamber 102.

As shown in fig. 12, in an embodiment of the present invention, the drainage pipe 322 is bent downward below the drainage port 321 to form a U shape, penetrates into the sewage chamber 102 from the bottom of the sewage chamber 102, and is vertically disposed in the sewage chamber 102 from bottom to top.

As shown in fig. 7 and fig. 1, in an embodiment of the present invention, the drain pipe 322 is bent downward below the water outlet 321 to form a U-shape, and then bent upward to form an inverted U-shape, and the top of the inverted U-shaped section 323 is higher than the top of the stainless steel pet drinking bowl 103, and then bent downward to form a U-shape, penetrates into the sewage cavity 102 from the bottom of the sewage cavity 102, and is vertically disposed in the sewage cavity 102 from bottom to top. As shown in fig. 7, the starting point of inverted U-shaped section 323 needs to be more than 2cm above the maximum water level for which stainless steel pet drinking bowl 103 is designed in order to have enough room for water bowl sensing level sensor 108. The inverted U-shaped section 323 of the drain pipe 322 is also provided with a water bowl sensing level sensor 108 for monitoring the water level of the stainless steel pet drinking bowl 103. As shown in fig. 1, the end of the drain pipe 322 at the upper portion of the soil chamber 102 is provided with a detachable filter head 329 for collecting debris, catching hairs, and the like. A slow release antiseptic patch may be placed in the sewage chamber 102 for inhibiting bacteria in the sewage chamber. As shown in fig. 8 and 9, the filter head 329 has a hollow structure with a plurality of through holes.

As shown in fig. 2, the sewage draining structure further includes an exhaust port 324 opened at the upper portion or top of the sewage chamber 102, a one-way exhaust valve 325 installed outside the exhaust port 324 to prevent the gas in the sewage chamber 102 from entering and exiting, and an exhaust pipe 326 vertically disposed inside the sewage chamber 102. As shown in fig. 1, one end of the air exhaust opening of the air exhaust pipe 326 is disposed at the upper portion of the sewage chamber 102, and the other end of the air exhaust pipe 326 extends out from the bottom of the sewage chamber 102 and is connected to an air pump 327 disposed below the bottom plate of the sewage chamber 102. As shown in fig. 4, the air pump 327 further has an air pump exhaust pipe 328, where the air pump exhaust pipe 328 is a component of the air pump, and is used for finally exhausting air.

As shown in fig. 1, the end of the exhaust pipe 326 located at the upper portion of the sewage chamber 102 is provided with an inverted U-shaped pipe section 330 and a buoyancy valve 331. As shown in fig. 10, the main structure of the buoyancy valve 331 is a cylindrical cavity with openings at upper and lower ends, the upper end of the cylindrical cavity is communicated with the inverted U-shaped pipe section 330 at the end of the air exhaust pipe 326, and a plurality of through holes 332 are formed at the upper part of the sidewall of the cylindrical cavity. As shown in fig. 11, the inside of the cylindrical cavity is provided with a float 333 which can block the mouth of the inverted U-shaped pipe section 330 and has a diameter larger than the lower end opening of the cylindrical cavity. The buoyancy valve 331 prevents water from entering the air pump 327 when full, and the buoyancy valve 331 provides a second level of security when the sensing level sensor fails or otherwise becomes accidentally defective.

As shown in fig. 1, the machine body 100 further includes a vertical equipment cavity 105 sandwiched between the clean water chamber 101 and the foul water chamber 102. As shown in fig. 5 and 6, the vertical device cavity 105 is used for accommodating components of the purified water filling structure and the sewage draining structure which are higher than the stainless steel pet drinking bowl 103 and are not arranged in the purified water cavity 101 and the sewage cavity 102; water fill tap 313 is disposed above stainless steel pet drinking bowl 103 outside vertical equipment cavity 105.

As shown in fig. 1, the housing 100 further includes a transverse equipment cavity 106 disposed below the clean water chamber 101, the dirty water chamber 102, and the stainless steel pet drinking bowl 103. Fig. 4 is a schematic view of the bottom view of the transverse equipment cavity 106 with its panel removed, as shown in fig. 4, wherein the transverse equipment cavity 106 is configured to accommodate components below the clean water chamber 101, the dirty water chamber 102 and the stainless steel pet drinking bowl 103 that house the clean water injection structure and the dirty water discharge structure. As shown in FIG. 3, a through hole 112 for air discharge may be additionally formed in the rear wall of the transverse equipment cavity 106 in communication with the air pump exhaust pipe 328.

The vertical equipment cavity 105 and the horizontal equipment cavity 106 mainly have the function of hiding components, so that the drinking water machine is more concise to view outside, the components are protected while being hidden, and the service life is prolonged.

As shown in fig. 5 or fig. 6, at least one ultraviolet disinfection lamp 109 is further disposed in the vertical equipment cavity 105, and the wall surface of the vertical equipment cavity 105, which is connected with the water purification cavity 101 and the sewage cavity 102, is a transparent wall surface. The transparent wall is arranged to allow ultraviolet rays to pass through, and the plate made of acrylic materials is preferably adopted.

As shown in fig. 6, a high level sensing liquid level sensor 110 for monitoring the high water level of the sewage chamber is arranged at the upper part in the vertical equipment cavity 105, and as shown in fig. 5, a low level sensing liquid level sensor 111 for monitoring the low water level of the purified water chamber is arranged at the lower part in the equipment cavity.

As shown in fig. 5, the purified water injection structure further includes a flow meter 314 disposed between the water pump or solenoid valve 312 and the water injection tap 313.

As shown in fig. 1, the inside of the water purification chamber 101 is further provided with a filtering device 107, fig. 1 is a schematic structural diagram of an embodiment of the present invention, in fig. 1, the filtering device 107 is composed of a panel transversely disposed in the water purification chamber 101, wherein the panel is hollow in the middle and can have a slot, and a filtering core clamped in the hollow in the middle of the panel. The filter element of the filter device 107 can be water filter elements which are easily purchased and produced in the market, such as activated carbon filter elements, and the filter elements are replaced by pet owners regularly.

As shown in fig. 2, the one-way exhaust valve 325 is a flexible sheet structure added on the top end of the exhaust port 324 of the sewage chamber, only one side of the flexible sheet structure is fixed on the top end of the sewage chamber 102, and the fixed connection position of the flexible sheet structure does not block the exhaust port 324 of the sewage chamber. The flexible sheet structure can adopt a rubber sheet.

The controller 104 is used for controlling the ultrasonic transducer 201, the water pump or the electromagnetic valve 312, the air pump 327, the flow meter 314, the water bowl sensing liquid level sensor 108, the high sensing liquid level sensor 110, the low sensing liquid level sensor 111 and the ultraviolet disinfection lamp 109. The control ultrasonic transducer 201, the water pump or solenoid valve 312, the air pump 327, the flow meter 314, and the inductive level sensor are all available in the art and are commercially available. The connection between the controller 104 and the above components may be in the form of circuit connection, etc., and the connection lines thereof are not shown in the schematic diagram. The ultrasonic transducer 201 can be made of an ultrasonic transducer ceramic plate (specification: 43kHz, 35W, diameter 50mm × 2.6mm) produced by Jielite ultrasonic cleaning equipment Limited of Shenzhen. The water pump 312 may be a "Yangxing" brand 6-12V-PC model pump manufactured by Anqingyanxi model technologies, Inc. The air pump 327 may be a 12V micro vacuum air pump (model 3035A) manufactured by wilez electronic technology ltd, mountain; or a 12v air pump (model 555) produced by a Huangjunda motor. The flow meter 314 may be a "di jiang" brand small water flow sensor (model YF-S401) manufactured by energy-saving electronics ltd. The water bowl induction liquid level sensor 108, the high-level induction liquid level sensor 110 and the low-level induction liquid level sensor 111 can be non-contact liquid level sensors (model: XKC-Y26-NPN (5-12V)) produced by Shenzhen Spacek science and technology Limited. The controller 104 is a programmable controller for controlling the above components, the driving of the above components can be integrated on a circuit board, the monitoring of the water level and the flow can be realized through simple programming, and the time for automatically changing water and automatically adding new purified water can be set. The driving of the above-mentioned components is provided by the manufacturer, and the programming is also achieved by the prior art.

The utility model discloses a working process and principle are:

firstly, regarding the function of automatically cleaning the stainless steel pet drinking bowl, the bacteria biofilm attached to the wall of the drinking bowl is removed by ultrasonic waves, and the cleaning is very effective. The utility model discloses a pet water dispenser is at stainless steel pet water bowl 103 bottom attached ultrasonic transducer 201, and direct, indirect effect to water and filth through cavitation, acceleration effect and the direct current effect of the ultrasonic wave of production in aqueous makes the filth layer dispersed, emulsify, peel off and reach the washing purpose. The scheme has the advantages of no need of complex mechanical structure, simplicity, reliability and safety, and no injury to people and pets in work.

Secondly, regarding the function of draining away sewage, the pet water dispenser of the present invention utilizes the one-way exhaust valve 325 to perform the one-way sealing design on the sewage cavity 102, and air can only go out but can not enter. The ports of the drain pipe 322 and the suction pipe 326 in the sewage chamber 102 are both above the design liquid level. By drawing off air from the interior of the sewage chamber 102, a negative pressure is created, and atmospheric pressure will force sewage from the stainless steel pet drinking bowl 103 into the sewage chamber 102. The utility model discloses a pet water dispenser has designed a plurality of U-shaped sections near stainless steel pet water bowl 103's drain pipe 322, reduces the deposit water in the pipeline as far as possible like this, and these U-shaped sections are near water bowl, can be arrived by ultrasonic cleaning. The advantage of this scheme is, does not need the water pump, and small-size water pump can't handle and has hair, food waste and possible solid particle, and water pump inner structure is complicated, breeds the bacterium easily. In addition, because the sewage outlet in the sewage cavity 102 is above the designed liquid level, the sewage cannot flow back into the stainless steel pet drinking bowl 103, the stainless steel pet drinking bowl 103 does not need to pass through complicated water seal, and the large-volume sewage is easier to drain.

Thirdly, regarding the function of injecting new water, the pet water dispenser of the utility model stores the water in the water purification chamber 101, and the water injection tap 313 is connected through the water pipe 311, and the water is injected into the stainless steel pet water bowl 103 through the water pipe 311 and the water injection tap 313. The water source in the water purifying cavity 101 is previously stored purified water or tap water and the like. A filter device 107 can be added to the clean water chamber 101, in particular when tap water is used, which filters out harmful substances. A water pump or a solenoid valve 312 is arranged in the middle of the water pipe 311, and a food grade water pump or a food grade solenoid valve is adopted in the preferred scheme to control the water flow. Attached to the drain pipe U-shaped section is a water bowl sensing level sensor 108 for monitoring the water level in the water bowl. The controller 104 monitors the water bowl sensing level sensor 108 and presets time-related control functions such as timing water change and the like to ensure that water does not overflow when purified water is injected. A flow meter 314 is further arranged in the middle of the clean water pipeline, namely the water pipe 311, and is used for monitoring the water quantity injected each time.

Although the invention has been described and illustrated herein with reference to a particular arrangement or configurations, it is not intended to be limited to the details shown, since various modifications and structural changes may be made therein without departing from the spirit of the invention.

The utility model relates to a part all is the same with prior art or can adopt prior art to realize.

Claims

1. The utility model provides a pet water dispenser of automatically cleaning and automatic water changing which characterized in that: comprises a machine body (100), a self-cleaning structure and an automatic water changing structure; the machine body (100) comprises a water purifying cavity (101), a sewage cavity (102), a stainless steel pet drinking bowl (103) and a controller (104); the self-cleaning structure comprises an ultrasonic transducer (201) attached to the bottom of a stainless steel pet drinking bowl (103); the automatic water changing structure comprises a purified water injection structure and a sewage discharge structure; the purified water injection structure comprises a water pipe (311), a water pump or an electromagnetic valve (312) and a water injection faucet (313), which are sequentially communicated with the purified water cavity (101); the sewage discharge structure comprises a water discharge port (321) arranged at the bottom of the stainless steel pet drinking bowl (103), and a water discharge pipe (322) connected with the water discharge port (321) and the sewage cavity (102), wherein the water discharge pipe (322) is bent downwards below the water discharge port (321) to form a U shape, penetrates into the sewage cavity (102) from the bottom of the sewage cavity (102), is vertically arranged in the sewage cavity (102) from bottom to top, and the top end of the water discharge pipe reaches the upper part of the sewage cavity (102); the sewage discharge structure further comprises an air pumping pipe (326) vertically arranged inside the sewage cavity (102), one end of an air pumping hole of the air pumping pipe (326) is arranged on the upper portion of the sewage cavity (102), and the other end of the air pumping pipe (326) penetrates out of the bottom of the sewage cavity (102) and is connected with an air pump (327) arranged below the bottom plate of the sewage cavity (102).

2. The self-cleaning and automatic water changing pet drinking machine of claim 1, characterized in that the machine body (100) further comprises a vertical equipment cavity (105) sandwiched between the clean water cavity (101) and the sewage cavity (102), the vertical equipment cavity (105) is used for accommodating components which are higher than the stainless steel pet drinking bowl (103) of the clean water filling structure and the sewage draining structure and are not arranged in the clean water cavity (101) and the sewage cavity (102); the water injection faucet (313) is arranged above the stainless steel pet drinking bowl (103) outside the vertical equipment cavity (105); the machine body (100) further comprises a transverse equipment cavity (106) arranged below the water purification cavity (101), the sewage cavity (102) and the stainless steel pet drinking bowl (103), and the transverse equipment cavity (106) is used for containing parts, lower than the water purification cavity (101), the sewage cavity (102) and the stainless steel pet drinking bowl (103), of the purified water injection structure and the sewage discharge structure.

3. The self-cleaning and automatic water changing pet drinking fountain according to claim 1, wherein the sewage draining structure further comprises an air outlet (324) provided at the upper part or top of the sewage chamber (102), the air outlet (324) is an air outlet hole with a diameter less than 2mm, or a one-way air outlet valve (325) is provided above the air outlet (324) for preventing air in the sewage chamber (102) from entering and exiting.

4. The self-cleaning and automatic water changing pet drinking machine as claimed in claim 1, characterized in that the inside of the water purifying chamber (101) is further provided with a filtering device (107).

5. The self-cleaning and automatic water changing pet drinking machine of claim 1, characterized in that the drain pipe (322) is bent downwards below the drain opening (321) to form a U shape and then bent upwards to form an inverted U shape, the top of the inverted U-shaped section (323) is higher than the top of the stainless steel pet drinking bowl (103), and then bent downwards to form a U shape and penetrate into the sewage cavity (102) from the bottom of the sewage cavity (102), and is vertically arranged in the sewage cavity (102) from bottom to top.

6. The self-cleaning and automatic water changing pet water dispenser of claim 2, characterized in that at least one ultraviolet disinfection lamp (109) is arranged in the vertical equipment cavity (105), and the wall surface of the vertical equipment cavity (105) connected with the water purification cavity (101) and the sewage cavity (102) is a transparent wall surface.

7. The self-cleaning and automatic water changing pet drinking machine as claimed in claim 2, characterized in that the upper part in the vertical equipment cavity (105) is provided with a high-level sensing liquid level sensor (110) for monitoring the high water level of the foul water tank, and the lower part in the equipment cavity is provided with a low-level sensing liquid level sensor (111) for monitoring the low water level of the clean water tank.

8. The self-cleaning and automatic water changing pet water dispenser of claim 1, 6 or 7, characterized in that the controller (104) is used for controlling the ultrasonic transducer (201), the water pump or the electromagnetic valve (312), the air pump (327), the high-level sensing liquid level sensor (110), the low-level sensing liquid level sensor (111) and the ultraviolet disinfection lamp (109).

9. A self-cleaning and automatic water changing pet water dispenser as claimed in claim 1, characterized in that the end of the drain pipe (322) located at the upper part of the sewage chamber (102) is provided with a detachable filter head (329).

10. The self-cleaning and automatic water changing pet drinking machine as claimed in claim 1, characterized in that the end of the air extraction pipe (326) located at the upper part of the sewage chamber (102) is provided with an inverted U-shaped pipe section (330) and a buoyancy valve (331), the main structure of the buoyancy valve (331) is a cylindrical cavity with openings at the upper and lower ends, the upper end of the cylindrical cavity is communicated with the inverted U-shaped pipe section (330) at the end of the air extraction pipe (326), the upper part of the side wall of the cylindrical cavity is provided with a plurality of through holes (332), and a float (333) capable of blocking the opening of the inverted U-shaped pipe section (330) of the through hole (332) and having a diameter larger than the opening at the lower end of the cylindrical cavity is arranged inside the cylindrical cavity.