Vacuum negative pressure device and pet hair clipper

Abstract

The first aspect of the present application discloses a vacuum negative pressure device, comprising: a machine body with an air duct; a valve seat with a communication cavity, the communication cavity being communicated with a first flow channel, a second flow channel and a third flow channel; a reversing valve rotatably installed in the communication cavity, the reversing valve having a first connection channel and a second connection channel which are independent of each other, when the reversing valve is in a first position, the first connection channel communicates the first flow channel and the second flow channel; when the reversing valve is in a second position, the second connection channel communicates the first flow channel and the third flow channel. By using the above, the vacuum negative pressure device of the present embodiment can be used for dust collection and blowing at the same time. The second aspect of the present application also discloses a pet hair clipper using the above vacuum negative pressure device. When the pet hair clipper of the present embodiment is used to trim the hair of a pet, the vacuum negative pressure device can absorb the hair, and when the pet has finished taking a bath, the vacuum negative pressure device can dry the hair of the pet, which is convenient to use.

Description

Technical Field

[0001] This invention relates to the field of household appliances, and in particular to a vacuum negative pressure device and a pet grooming machine having the above-mentioned vacuum negative pressure device. Background Technology

[0002] With social progress and improved living standards, more and more people enjoy keeping pets, with cats and dogs, especially those with thick fur, being particularly popular. To keep their pets clean and tidy, people often use electric clippers to trim their fur. However, during this process, shed fur scatters into the surrounding environment, requiring subsequent cleaning, which is extremely inconvenient. Therefore, some pet grooming and hair-vacuuming machines that integrate shaving and hair-vacuuming functions have appeared on the market, as detailed in patent publications such as CN202022250774.3 and CN200820093995.0. These pet grooming and hair-vacuuming machines all include a vacuum negative pressure device, and a clipper is installed at the free end of the vacuum cleaner's suction pipe, with a hair-vacuuming channel connected to the suction pipe. When in use, the vacuum negative pressure device starts working and generates negative pressure. At this time, the user uses the hair clipper to trim the pet's hair. The trimmed hair is sucked into the hair clipper's suction channel and collected in the vacuum cleaner's dust collection chamber through the suction pipe.

[0003] While the aforementioned pet hair trimmer and vacuum cleaner meets users' needs for trimming and removing pet hair, users usually bathe their pets after trimming their hair. After bathing, the pet's fur is still wet, requiring users to use a hairdryer to dry the fur, which is inconvenient. Summary of the Invention

[0004] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention provides a vacuum negative pressure device that can be used to generate negative pressure and also has a blower function. The present invention also provides a pet hair clipper with the above-mentioned vacuum negative pressure device, which makes it convenient for users to trim their pets' fur and also convenient for users to dry their pets' fur after bathing.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] According to certain embodiments of the first aspect of the present invention, a vacuum negative pressure device includes: a main body, wherein an air duct is provided inside the main body, one end of the air duct has an air inlet, and the other end of the air duct has an air outlet; a valve seat is disposed in the main body, wherein a communicating cavity is provided inside the valve seat, and a ventilation hole is opened on the side wall of the communicating cavity, the communicating cavity communicating with a first flow channel, a second flow channel, and a third flow channel that are independent of each other, the second flow channel communicating with the air inlet, and the third flow channel communicating with the air outlet; and a reversing valve is rotatably mounted in the communicating cavity, the reversing valve having a first connecting channel and a second connecting channel that are independent of each other, the reversing valve being rotatable relative to the valve seat to a first position or a second position; wherein, when the reversing valve is in the first position, the first connecting channel communicates with the first flow channel and the second flow channel; and when the reversing valve is in the second position, the second connecting channel communicates with the first flow channel and the third flow channel.

[0007] The beneficial effects of the vacuum negative pressure device according to certain embodiments of the first aspect of the present invention are as follows: A reversing valve, rotatably mounted within the valve seat and capable of rotating to a first or second position, is installed. When negative pressure is required, the reversing valve rotates to the first position, connecting the first flow channel and the second flow channel. At this time, the vacuum negative pressure device initiates suction, allowing air to be drawn into the air duct through the first and second flow channels. The air then flows from the air outlet to the connecting cavity and is discharged to the outside through the ventilation hole. Negative pressure is formed at the opening of the first flow channel. When blowing air is required, the reversing valve rotates to the second position, connecting the second connecting channel to the first and third flow channels. The vacuum negative pressure device initiates suction, allowing outside air to enter the connecting cavity through the ventilation hole, pass through the second flow channel into the air duct, flow through the air outlet to the third flow channel, then flow from the second connecting channel to the first flow channel, and finally be ejected from the first flow channel, thus forming blowing air. By employing the above, the vacuum negative pressure device of this embodiment can be used to generate negative pressure and also for blowing air, meeting different user needs.

[0008] In some embodiments of the first aspect of the present invention, the main body is provided with a fan housing, the fan housing having an installation cavity that is sealed and communicates with the air outlet, the installation cavity having a third connecting channel that communicates with the third flow channel, and a fan being installed inside the installation cavity.

[0009] In some embodiments of the first aspect of the present invention, the third connection channel is provided with a heating device that can generate heat when energized.

[0010] In some embodiments of the first aspect of the present invention, a heating device capable of generating heat when energized is provided in the second flow channel.

[0011] In some embodiments of the first aspect of the present invention, the first flow channel and the third flow channel are disposed one-to-one on opposite side walls of the valve seat along the horizontal direction, and the second flow channel is disposed on the upper side wall of the valve seat along the vertical direction.

[0012] In some embodiments of the first aspect of the present invention, a plurality of ventilation holes are provided on the sidewall of the communicating cavity, some of the ventilation holes being provided on the front sidewall of the communicating cavity and some of the ventilation holes being provided on the rear sidewall of the communicating cavity.

[0013] In some embodiments of the first aspect of the present invention, the air duct has at least one filter chamber, and a filter element or filter bag is disposed in the filter chamber.

[0014] In some embodiments of the first aspect of the present invention, a rotation drive device is further included, disposed on the machine body or the valve seat, the rotation drive device being rotatably connected to the reversing valve, and the rotation drive device being capable of driving the reversing valve to rotate relative to the valve seat to a first position or a second position.

[0015] In some embodiments of the first aspect of the present invention, the rotation drive device is a servo motor that mounts the main body or the valve seat, and further includes a control system electrically connected to the servo motor, wherein the control system is capable of controlling the servo motor to drive the reversing valve to rotate relative to the valve seat to a first position or a second position.

[0016] A pet grooming machine according to certain embodiments of the second aspect of the present invention includes a grooming clipper equipped with the aforementioned vacuum negative pressure device.

[0017] The beneficial effects of the pet grooming machine according to certain embodiments of the second aspect of the present invention are as follows: by employing the above-described vacuum negative pressure device, when the pet grooming machine of this embodiment is used to trim the fur of a pet, the vacuum negative pressure device can generate negative pressure and suck up the fur. After the pet has finished bathing, the vacuum negative pressure device can dry the pet's fur, making it convenient to use. Attached Figure Description

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0019] Figure 1 This is a schematic diagram of the structure of a vacuum negative pressure device according to certain embodiments of the first aspect of the present invention;

[0020] Figure 2 for Figure 1 The diagram shows the internal structure of the vacuum negative pressure device.

[0021] Figure 3 for Figure 1The diagram shows a cross-sectional view of the internal structure of the reversing valve in the vacuum negative pressure device when it is rotated to the first position.

[0022] Figure 4 for Figure 1 The diagram shows a cross-sectional view of the internal structure of the reversing valve in the vacuum negative pressure device when it is rotated to the second position.

[0023] Figure 5 for Figure 1 The diagram shows the assembly structure of the valve seat, reversing valve and fan housing in the vacuum negative pressure device.

[0024] Figure 6 for Figure 1 The diagram shows a partial assembly structure exploded view of the valve seat, reversing valve, and fan housing in the vacuum negative pressure device.

[0025] Figure 7 for Figure 1 The diagram shows the assembly structure of the valve seat, the reversing valve, and the fan housing in the vacuum negative pressure device when the reversing valve is rotated to the first position.

[0026] Figure 8 for Figure 1 The figure shows a cross-sectional view of the assembly structure of the valve seat, the reversing valve, and the fan housing in the vacuum negative pressure device when the reversing valve is rotated to the first position.

[0027] Figure 9 This is a schematic diagram of the assembly structure of the valve seat, reversing valve and fan housing in the vacuum negative pressure device according to the second embodiment of the first aspect of the present invention;

[0028] Figure 10 for Figure 9 The figure shows a cross-sectional view of the assembly structure of the valve seat, reversing valve and fan housing in the vacuum negative pressure device. Detailed Implementation

[0029] This section will describe in detail specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0030] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0031] In the description of this invention, "several" means one or more, "more than" means three or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of terms such as "first," "second," etc., is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the sequential relationship of the indicated technical features.

[0032] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0033] Reference Figures 1 to 8 The vacuum negative pressure device according to certain embodiments of the first aspect of the present invention includes a main body 100 with an internal air duct. One end of the air duct has an air inlet 120, and the other end has an air outlet 130. Therefore, air can flow through the air inlet 120 into the air duct, and then the air can leave the air duct through the air outlet 130. A valve seat 200 is provided on the main body 100. The valve seat 200 has a connecting cavity 201. The side wall of the connecting cavity 201 has a ventilation hole 202. That is, outside air can enter the connecting cavity 201 through the ventilation hole 202, or the air inside the connecting cavity 201 can be discharged to the outside of the valve seat 200 through the ventilation hole 202. The connecting cavity 201 is connected to three independent flow channels: a first flow channel 210, a second flow channel 220, and a third flow channel 230. The second flow channel 220 is connected to the air inlet 120, and the third flow channel 230 is connected to the air outlet 130. A reversing valve 300 is rotatably installed in the connecting cavity 201. The reversing valve 300 has two independent connecting channels: a first connecting channel 310 and a second connecting channel 320. The reversing valve 300 can rotate relative to the valve seat 200 to a first position or a second position. When the reversing valve 300 is in the first position, the first connecting channel 310 connects the first flow channel 210 and the second flow channel 220. When the reversing valve 300 is in the second position, the second connecting channel 320 connects the first flow channel 210 and the third flow channel 230.

[0034] Reference Figure 3 , Figure 5 and Figure 6 ( Figure 3 and Figure 5The direction of the arrow indicates the direction of air flow. The working principle of the vacuum negative pressure device in certain embodiments of the first aspect of the present invention when used to generate negative pressure is as follows: When the vacuum negative pressure device needs to be used to generate negative pressure, the reversing valve 300 rotates to the first position relative to the valve seat 200. At this time, the first connecting channel 310 of the reversing valve 300 connects the first flow channel 210 and the second flow channel 220 to form a complete channel. The main body 100 starts and performs suction. At this time, the outside air can be sucked in from the first flow channel 210 and flow through the second flow channel 220 and the air inlet 120. Then the air flows into the air duct. Then the air passes through the air outlet 130 of the air duct and flows through the third flow channel 230. Then it flows into the connecting cavity 201 of the valve seat 200. Finally, the air is discharged from the ventilation hole 202 on the side wall of the connecting cavity 201 to the outside of the valve seat 200. By adopting the above structure, a negative pressure is formed at the opening of the first flow channel 210 of the vacuum negative pressure device, so that the user can use the vacuum negative pressure device to vacuum or extract air.

[0035] Reference Figure 4 , Figure 7 and Figure 8 ( Figure 4 and Figure 8 The direction of the arrow indicates the direction of air flow. The working principle of the vacuum negative pressure device in certain embodiments of the first aspect of the present invention when used for blowing is as follows: When the vacuum negative pressure device needs to be used for blowing, the reversing valve 300 rotates to the second position relative to the valve seat 200. At this time, the second connecting channel 320 of the reversing valve 300 connects the first flow channel 210 and the third flow channel 230 to form a complete channel. The main body 100 starts and performs suction. The outside air enters the connecting cavity 201 through the air exchange hole 202, and then passes through the first flow channel 210 and the air inlet 120 to enter the filter cavity 110. The air then passes through the air outlet 130, the third flow channel 230 and the second connecting channel 320. Finally, the air is ejected from the first flow channel 210, thereby forming a blower. The first flow channel 210 can be connected to the external dust suction pipe or extension pipe. By adopting the above structure, the vacuum negative pressure device can blow air outward when needed. Therefore, users can use the vacuum negative pressure device to blow air to clean the ground, dry pets' fur, or inflate items, thus meeting users' needs.

[0036] Reference Figures 3 to 8In order to enable the vacuum negative pressure device to filter air or collect debris when generating negative pressure, in some embodiments of the first aspect of the present invention, the air duct inside the main body 100 has at least one filter chamber 110, and a filter element or filter bag is disposed inside the filter chamber 110. Specifically, the main body 100 has a filter chamber 110, an air inlet 120 is opened on the side wall of the filter chamber 110, and an air outlet 130 is opened on the bottom wall of the filter chamber 110. In this case, the filter chamber 110 constitutes the aforementioned air duct. Depending on the actual needs of use, a filter element or a filter bag for collecting and filtering waste can be installed inside the filter chamber 110. The aforementioned filter element can be a filter screen or a filter sponge, etc., depending on the actual situation.

[0037] It should be noted that in some embodiments of the first aspect of the present invention, a filter chamber 110 may be provided at a certain section of the air duct, or a filter chamber 110 may be provided at different locations in the air duct, depending on actual needs.

[0038] Reference Figure 3 , Figure 5 and Figure 6 ( Figure 3 and Figure 5 The direction of the arrow indicates the direction of air flow. The working principle of the vacuum negative pressure device in certain embodiments of the first aspect of the present invention when used for dust collection is as follows: When the vacuum negative pressure device needs to be used for dust collection, the reversing valve 300 rotates to the first position relative to the valve seat 200. At this time, the first connecting channel 310 of the reversing valve 300 connects the first flow channel 210 and the second flow channel 220 to form a complete channel. The main body 100 starts and performs suction. At this time, the outside air and garbage such as hair and dust can be sucked in from the first flow channel 210 and flow through the second flow channel 220 and the air inlet 120, and finally delivered to the filter chamber 110. The hair, dust and other garbage are collected in the filter chamber 110, and the filtered air passes through the air outlet 130 and flows through the third flow channel 230, and then flows into the connecting cavity 201 of the valve seat 200. Finally, the air is discharged to the outside of the valve seat 200 from the ventilation hole 202 on the side wall of the connecting cavity 201. By adopting the above structure, the vacuum negative pressure device can smoothly suck hair, dust and other garbage into the filter chamber 110, and at the same time filter the air. At this time, the vacuum negative pressure device can be used to clean the environment.

[0039] Reference Figure 4 , Figure 7 and Figure 8 ( Figure 4 and Figure 8The direction of the arrow indicates the direction of air flow. The working principle of the vacuum negative pressure device in certain embodiments of the first aspect of the present invention when used for blowing is as follows: When the vacuum negative pressure device needs to be used for blowing, the reversing valve 300 rotates to the second position relative to the valve seat 200. At this time, the second connecting channel 320 of the reversing valve 300 connects the first flow channel 210 and the third flow channel 230 to form a complete channel. The main body 100 starts and performs suction. The outside air enters the connecting cavity 201 through the air exchange hole 202, and then passes through the first flow channel 210 and the air inlet 120 to enter the filter cavity 110. The filtered air then passes through the air outlet 130, the third flow channel 230 and the second connecting channel 320. Finally, the air is ejected from the first flow channel 210, thereby forming a blower. The first flow channel 210 can be connected to the external suction pipe or extension pipe. By adopting the above structure, the vacuum negative pressure device can blow air outward when needed, allowing users to use the vacuum negative pressure device to clean the ground or dry the pet's fur, thus meeting the user's needs.

[0040] To simplify the structure of the vacuum negative pressure device, specifically, a fan housing 400 is provided inside the main body 100. The fan housing 400 has an installation cavity 410 that is sealed and connected to the air outlet 130. That is, the fan housing 400 is sealed and connected to the air outlet 130. A fan 430 is installed inside the installation cavity 410, and a third connecting channel 420 that communicates with the third flow channel 230 is provided on the side wall of the installation cavity 410. By adopting the above structure, when the vacuum negative pressure device needs to generate negative pressure or blow air, it is only necessary to start the fan 430 to draw air, which is simple in structure.

[0041] Furthermore, in order to enable the vacuum negative pressure device to blow out hot air, in some embodiments of the first aspect of the present invention, referring to Figure 4 , Figure 7 and Figure 8 The second flow channel 220 is equipped with a heating device 500 that can generate heat when energized. Specifically, the heating device 500 can be an electrically energized resistance heating wire or a ceramic heating element, depending on the actual needs. When the vacuum negative pressure device is used for blowing air, the heating device 500 is energized and generates heat. At this time, when air passes through the air outlet 130, the mounting cavity 410, the third flow channel 230, and flows through the second connecting channel 320, the air is heated into hot air by the heating device 500. The hot air is finally ejected from the first flow channel 210, thus forming hot air. By adopting the above structure, the vacuum negative pressure device can blow hot air out when needed, allowing users to use hot air to dry pets' fur in cold weather, or to use the vacuum negative pressure device to blow hot air to dry items, etc.

[0042] It should be noted that the heating device 500 can be installed in other locations besides the second flow channel 220; please refer to the following for details. Figure 9 and Figure 10 In the second embodiment of the vacuum negative pressure device of the first aspect of the present invention, the heating device 500 is installed in the third connecting channel 420 of the fan housing 400. When the vacuum negative pressure device is used for blowing air, the heating device 500 is energized and heats up. At this time, air flows through the air outlet 130 to the mounting cavity 410 and flows through the third flow channel 230. The air is heated into hot air by the heating device 500 in the third flow channel 230. The hot air flows through the second connecting channel 320 and is ejected from the first flow channel 210, thereby forming hot air.

[0043] Reference Figures 2 to 8 To facilitate better connection and assembly between the valve seat 200 and the air duct, in some embodiments of the first aspect of the present invention, the first flow channel 210 and the third flow channel 230 are arranged in a horizontal direction on opposite side walls of the valve seat 200, and the second flow channel 220 is arranged in a vertical direction on the upper side wall of the valve seat 200. By adopting the above structure, the valve seat 200 becomes more compact and its arrangement more rational, while also facilitating connection and assembly between the valve seat 200 and the air duct.

[0044] Furthermore, to facilitate better air exchange between the connecting cavity 201 and the outside environment, in some embodiments of the first aspect of the present invention, a plurality of ventilation holes 202 are provided on the side wall of the connecting cavity 201. Specifically, some ventilation holes 202 are located on the front side wall of the connecting cavity 201, and some ventilation holes 202 are located on the rear side wall of the connecting cavity 201. By adopting the above structure, the air inside the connecting cavity 201 of the valve seat 200 can be exchanged with the outside environment more smoothly, facilitating the intake or exhaust of air by the valve seat 200.

[0045] Furthermore, to better drive the directional valve 300 to rotate, in some embodiments of the first aspect of the present invention, the vacuum negative pressure device further includes a rotation drive device. The rotation drive device is disposed on the main body 100 or the valve seat 200, and is rotatably connected to the directional valve 300. The rotation drive device can drive the directional valve 300 to rotate relative to the valve seat 200 to a first position or a second position. Specifically, the rotation drive device is a servo motor disposed on the main body 100 or the valve seat 200, and the servo motor is electrically connected to a control system. The control system can control the servo motor to drive the directional valve 300 to rotate relative to the valve seat 200 to the first position or the second position.

[0046] It should be noted that, in addition to the structure described above, the rotary drive device can also adopt other structures, such as a rotary handwheel located outside the main body 100. This rotary handwheel is connected to the reversing valve 300 via a transmission shaft. Therefore, by holding the rotary handwheel and driving it to rotate, the rotary handwheel can drive the reversing valve 300 to rotate to the first position or the second position.

[0047] Reference Figures 1 to 10 According to certain embodiments of the second aspect of the present invention, a pet grooming machine includes a grooming clipper configured with the aforementioned vacuum negative pressure device. Specifically, the pet grooming machine includes a grooming clipper and the aforementioned vacuum negative pressure device. A suction pipe is connected to the first flow channel 210 of the vacuum negative pressure device. The end of the suction pipe is detachably connected to the grooming clipper. When the vacuum negative pressure device is activated to generate negative pressure, the grooming clipper can trim the pet's fur. At this time, the vacuum negative pressure device can suck away the pet's shed fur through the suction pipe. When it is necessary to dry the pet's fur, the grooming clipper can be detached from the end of the suction pipe, and then the vacuum negative pressure device can be activated to blow-dry the pet's fur.

[0048] It should be noted that in some embodiments of the second aspect of the present invention, the hair clipper and the above-mentioned vacuum tube can also be configured as an integrated structure, which can be determined according to actual needs.

[0049] The pet grooming machine of this embodiment uses the aforementioned vacuum negative pressure device, which allows it to absorb the loose hair when trimming a pet's fur. After the pet has finished bathing, the vacuum negative pressure device can dry the pet's fur, making it convenient to use.

[0050] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A vacuum negative pressure device, characterized in that, include: The main body (100) is provided with an air duct, one end of which has an air inlet (120) and the other end of which has an air outlet (130). A valve seat (200) is disposed in the main body (100). A connecting cavity (201) is provided in the valve seat (200). A ventilation hole (202) is opened on the side wall of the connecting cavity (201). The connecting cavity (201) is connected to a first flow channel (210), a second flow channel (220) and a third flow channel (230) that are independent of each other. The second flow channel (220) is connected to the air inlet (120), and the third flow channel (230) is connected to the air outlet (130). A reversing valve (300) is rotatably mounted in the communicating cavity (201). The reversing valve (300) has a first connecting channel (310) and a second connecting channel (320) that are independent of each other. The reversing valve (300) can rotate relative to the valve seat (200) to a first position or a second position. When the reversing valve (300) is in the first position, the first connecting channel (310) connects the first flow channel (210) and the second flow channel (220). When the reversing valve (300) is in the second position, the second connecting channel (320) connects the first flow channel (210) and the third flow channel (230). The main body (100) is provided with a fan housing (400), the fan housing (400) has an installation cavity (410) that is sealed and connected to the air outlet (130), the installation cavity (410) has a third connecting channel (420) that is connected to the third flow channel (230), and a fan (430) is installed inside the installation cavity (410). The third connecting channel (420) or the second flow channel (220) is provided with a heating device (500) that can generate heat when powered on. The first flow channel (210) and the third flow channel (230) are arranged one-to-one on opposite side walls of the valve seat (200) in the horizontal direction, and the second flow channel (220) is arranged on the upper side wall of the valve seat (200) in the vertical direction.

2. The vacuum negative pressure device according to claim 1, characterized in that: The sidewall of the connecting cavity (201) is provided with a plurality of ventilation holes (202), some of which are located on the front sidewall of the connecting cavity (201) and some of which are located on the rear sidewall of the connecting cavity (201).

3. The vacuum negative pressure device according to claim 1, characterized in that: The air duct has at least one filter chamber (110), and a filter element or filter bag is provided in the filter chamber (110).

4. The vacuum negative pressure device according to claim 1, characterized in that: It also includes a rotation drive device, which is disposed on the main body (100) or the valve seat (200). The rotation drive device is rotatably connected to the reversing valve (300). The rotation drive device can drive the reversing valve (300) to rotate relative to the valve seat (200) to a first position or a second position.

5. The vacuum negative pressure device according to claim 4, characterized in that: The rotation drive device is a servo motor installed on the machine body (100) or the valve seat (200). It also includes a control system electrically connected to the servo motor, wherein the control system is capable of controlling the servo motor to drive the directional valve (300) to rotate relative to the valve seat (200) to a first position or a second position.

6. A pet grooming machine, characterized in that, Includes a hair clipper, the hair clipper being configured with a vacuum negative pressure device as described in any one of claims 1 to 5.

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