Processing equipment and cleaning device and negative pressure spray head thereof

Abstract

The utility model discloses processing equipment and a cleaning device and a negative pressure spray head thereof, the processing equipment comprises a spray head main body, a plurality of gas channels arranged at intervals, a plurality of liquid channels arranged at intervals and a plurality of liquid spraying through holes arranged at intervals are formed in the spray head main body, and the plurality of gas channels are horizontally communicated with the plurality of liquid spraying through holes respectively; the liquid channels are obliquely communicated with the liquid spraying through holes respectively, one ends of the liquid channels are communicated with the outside for liquid feeding, and one ends of the gas channels are communicated with the outside for feeding compressed air to suck the liquid in the corresponding liquid channels to the liquid spraying through holes and spray the liquid out of the sprayer body. The negative-pressure spray head is high in cleaning capacity, chippings and impurities on the surface of a workpiece can be cleaned away, and residual cutting fluid on the surface of the workpiece can also be cleaned away; and the workpieces do not need to be repeatedly cleaned, the cleaning efficiency is high, meanwhile, chippings and impurities can be prevented from being secondarily sputtered to the workpieces, and the surfaces of the workpieces are prevented from being scratched.

Description

Technical Field

[0001] The present application relates to the technical field of nozzles, and in particular to a processing device and a cleaning device thereof and a negative pressure nozzle. Background Art

[0002] In the process of CNC machining, a nozzle is usually used to blow air on the processed workpiece to remove debris and impurities remaining on the surface of the workpiece. However, debris and impurities tend to adhere to the surface of the workpiece and cannot be completely removed by blowing air. In addition, the existing nozzle has a small cleaning area and needs to blow air back and forth on the workpiece, which not only reduces work efficiency, but also during the nozzle blowing back and forth, debris and impurities are easily splashed onto the workpiece for a second time, causing damage to the workpiece. Utility Model Content

[0003] In view of the above, it is necessary to propose a processing equipment and a cleaning device and a negative pressure nozzle thereof, which can achieve strong cleaning ability, high cleaning efficiency, and avoid damaging the workpiece during the cleaning process.

[0004] An embodiment of the present application provides a negative pressure nozzle, which includes a nozzle body, in which a plurality of spaced-apart gas channels, a plurality of spaced-apart liquid channels, and a plurality of spaced-apart liquid spraying holes are provided, the plurality of gas channels are horizontally connected to the plurality of liquid spraying holes, respectively, the plurality of liquid channels are obliquely connected to the plurality of liquid spraying holes, one end of the plurality of liquid channels is connected to the outside for liquid intake, and one end of the plurality of gas channels is connected to the outside for compressed air to suck the liquid in the corresponding liquid channels into the liquid spraying holes and spray out the nozzle body.

[0005] During operation, the negative pressure nozzle first introduces compressed air into multiple gas channels, and the air flows out from the liquid spray hole after passing through the gas channel. Since the pressure is low in places with fast flow rate, the pressure in the liquid spray hole is low at this time, and the pressure in the liquid channel is high. Since there is a pressure difference between the liquid spray hole and the liquid channel, the liquid flows from the outside into the liquid channel, and flows from the liquid channel into the liquid spray hole. When the compressed air and the liquid merge, the liquid is broken into water mist, and the water mist is discharged from the nozzle body with the air. At this time, the water mist can be used to clean the surface of the workpiece. Since the cleaning medium is water mist, the water mist can not only clean the debris and impurities on the surface of the workpiece, but also clean the cutting fluid remaining on the surface of the workpiece. The water mist cleaning has a stronger cleaning ability and cleans the workpiece more cleanly. Since the nozzle body is provided with multiple liquid spray holes, when cleaning the workpiece, each liquid spray hole will spray water mist and clean the workpiece at the same time. By setting multiple liquid spray holes, the cleaning area of ​​the negative pressure nozzle is increased, so that the workpiece only needs to be cleaned once, and there is no need to clean the workpiece back and forth multiple times, thereby improving the cleaning efficiency. Since the negative pressure nozzle does not need to clean the workpiece back and forth, it avoids secondary splashing of debris and impurities onto the workpiece, thereby avoiding scratches on the workpiece surface.

[0006] In some embodiments, the gas channel includes an intake channel and a boost air channel connected in sequence, the intake channel is connected to the outside, the liquid spray hole is horizontally connected to the boost air channel, and the cross-sectional area of ​​the boost air channel is smaller than the cross-sectional area of ​​the intake channel and the liquid spray hole.

[0007] In some embodiments, the aperture of the air intake passage gradually decreases from one end away from the boost air duct to one end close to the boost air duct; the aperture of the liquid injection hole gradually decreases from one end away from the boost air duct to one end close to the boost air duct.

[0008] In some embodiments, the nozzle body is further provided with a gas collecting chamber spaced apart from the liquid channel, one end of the gas collecting chamber is connected to the outside, and the other end of the gas collecting chamber is obliquely connected to the air inlet channels of the plurality of gas channels.

[0009] In some embodiments, the nozzle body is further provided with an air supply channel, one end of which is connected to the outside, and the other end of which is connected to the liquid channel obliquely to the upper and lower side walls opposite to the liquid injection hole.

[0010] In some embodiments, the liquid channel includes an inlet channel and an outlet channel, one end of the inlet channel is connected to the outside, the other end of the inlet channel is connected to the outlet channel, and the end of the outlet channel away from the inlet channel is connected to the liquid injection hole.

[0011] In some embodiments, the nozzle body is further provided with a liquid storage channel spaced apart from the gas channel, one end of the liquid storage channel is connected to the outside, the other end of the liquid storage channel is respectively connected to a plurality of the liquid inlet channels, the liquid inlet channel is connected to the outside through the liquid storage channel, and the liquid storage channel is used to store liquid.

[0012] In some embodiments, the negative pressure nozzle also includes an anti-backflow component, which includes an anti-backflow valve, including a support ring body and a plurality of movable parts, the support ring body is arranged at one end of the liquid storage channel, one end of the plurality of movable parts is connected to the side of the support ring body facing the liquid inlet channel, and the other ends of the plurality of movable parts are gathered together to prevent the liquid in the liquid storage channel from flowing back, and can also move away from each other under the action of external force to allow external liquid to flow into the liquid storage channel; a gasket is arranged in the liquid storage channel and abuts against the side of the support ring body facing away from the plurality of movable parts.

[0013] A cleaning device comprises a liquid box, an air source and the above-mentioned negative pressure nozzle, wherein the liquid box is connected with the liquid channel, and the air source is connected with the air channel so that compressed air enters the air channel.

[0014] A processing equipment comprises a tool, a fixture and the above-mentioned cleaning device, wherein the fixture is used to clamp a product, the tool processes the product, and the negative pressure nozzle sprays the liquid to clean the processed product. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of the negative pressure nozzle provided in the embodiment of the present application.

[0016] Figure 2 yes Figure 1 The schematic cross-sectional view of the negative pressure nozzle along line II-II is shown.

[0017] Figure 3 yes Figure 1 The schematic cross-sectional view of the negative pressure nozzle along line III-III is shown.

[0018] Figure 4 yes Figure 1 The schematic cross-sectional view of the negative pressure nozzle along line IV-IV is shown.

[0019] Figure 5 yes Figure 2 A schematic diagram of the three-dimensional structure of the backflow prevention component in the negative pressure nozzle is shown.

[0020] Main component symbols

[0021] Negative pressure nozzle 100

[0022] Nozzle body 10

[0023] Gas channel 11

[0024] Intake channel 111

[0025] Pressurized airway 112

[0026] Liquid spraying hole 113

[0027] Liquid channel 12

[0028] Liquid inlet channel 121

[0029] Liquid outlet channel 122

[0030] Gas chamber 13

[0031] Air supply channel 14

[0032] Liquid storage channel 15

[0033] Liquid inlet 151

[0034] Liquid storage tank 152

[0035] Backflow prevention assembly 20

[0036] Backflow prevention valve 21

[0037] Support ring 211

[0038] Activities Department 212

[0039] Gasket 22 DETAILED DESCRIPTION

[0040] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0041] In the description of the present application, it should be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, in the description of the present application, it should be noted that the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0042] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication, it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0043] The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0044] See also Figure 1 The embodiment of the present application provides a negative pressure nozzle 100. The negative pressure nozzle 100 is used to clean the debris impurities remaining on the surface of the workpiece to prevent the debris impurities from scratching the surface of the workpiece.

[0045] See also Figures 1 to 4 The negative pressure nozzle 100 includes a nozzle body 10. A plurality of gas channels 11, liquid channels 12 and liquid injection holes 113 are provided in the nozzle body 10. The plurality of gas channels 11 correspond to the plurality of liquid injection holes 113 one by one and are connected horizontally. The plurality of liquid channels 12 correspond to the plurality of liquid injection holes 113 one by one and are connected obliquely. One end of the plurality of liquid channels 12 is connected to the outside for liquid inlet. The other end of the plurality of liquid channels 12 is connected to the plurality of liquid injection holes 113 so that liquid enters the liquid injection holes 113. Liquid in the plurality of liquid channels 12 can enter the corresponding gas channels 11. One end of the plurality of gas channels 11 is connected to the liquid injection holes 113, and the other end is connected to the outside, so that compressed air can be introduced into the gas channels 11 and the liquid injection holes 113 so that the liquid in the corresponding liquid channels 12 is sucked into the liquid injection holes 113 and sprayed out of the nozzle body 10.

[0046] During the operation of the negative pressure nozzle 100, compressed air is first introduced into one end of the multiple gas channels 11. After the air passes through the gas channels 11, it flows out from the liquid spray hole 113. Since the pressure is low where the flow rate is fast, the pressure in the liquid spray hole 113 is low at this time, and the pressure in the liquid channel 12 is high. Since there is a pressure difference between the liquid spray hole 113 and the liquid channel 12, the liquid flows from the outside into the liquid channel 12 and is introduced into the liquid spray hole 113 from the liquid channel 12. When the compressed air and the liquid merge, the liquid is broken into small particles of water mist, and the water mist is discharged from the nozzle body 10 with the air. At this time, the water mist can be used to clean the surface of the workpiece. In this way, since the cleaning medium is water mist, compared with the traditional method of air blowing cleaning, the water mist can not only clean the debris and impurities on the surface of the workpiece, but also clean the cutting fluid remaining on the surface of the workpiece. The water mist cleaning has a stronger cleaning ability and cleans the workpiece more cleanly. Since the nozzle body 10 is provided with a plurality of liquid spraying holes 113, when cleaning the workpiece, water mist will be sprayed out from each liquid spraying hole 113 and the workpiece will be cleaned at the same time. By providing a plurality of liquid spraying holes 113, the cleaning area of ​​the negative pressure nozzle 100 is increased, so that the water mist sprayed from the negative pressure nozzle 100 covers the surface of the workpiece, so that the workpiece only needs to be cleaned once, and there is no need to clean the workpiece back and forth multiple times, thereby improving work efficiency. Since the negative pressure nozzle 100 does not need to clean the workpiece back and forth, it avoids secondary splashing of debris and impurities onto the workpiece, thereby avoiding scratches on the surface of the workpiece. In addition, since the negative pressure nozzle 100 uses water mist for cleaning, the workpiece is cleaned while cleaning the debris and impurities, which is conducive to saving the processing procedures of the workpiece and improving work efficiency.

[0047] See also Figure 2 and Figure 4The gas channel 11 includes an air intake channel 111 and a pressurized air channel 112 arranged in sequence. The air intake channel 111 is connected to the outside and is used to introduce compressed air. The liquid spraying hole 113 is horizontally connected to the pressurized air channel 112. When the gas is discharged from the liquid spraying hole 113, the liquid in the liquid channel 12 flows into the liquid spraying hole 113 due to the fast air flow rate in the liquid spraying hole 113. The boost air duct 112 is located between the air intake channel 111 and the liquid spraying hole 113, and the boost air duct 112 is connected to the air intake channel 111 and the liquid spraying hole 113 respectively. The cross-sectional area of ​​the boost air duct 112 is smaller than the cross-sectional area of ​​the air intake channel 111 and the liquid spraying hole 113. In the present embodiment, the air intake channel 111, the boost air duct 112 and the liquid spraying hole 113 are all circular air ducts, that is, the aperture of the boost air duct 112 is smaller than the aperture of the air intake channel 111 and the liquid spraying hole 113. In this way, when compressed air flows from the air intake passage 111 into the boost air passage 112, due to the small cross-sectional area of ​​the boost air passage 112, when the gas flows from a space with a larger cross-sectional area into a space with a smaller cross-sectional area, the flow velocity of the gas in the boost air passage 112 will become faster. When the high-speed gas enters the liquid spraying hole 113 from the boost air passage 112, the air pressure is released and the instantaneous flow velocity of the air becomes larger, which is beneficial to increase the negative pressure in the liquid spraying hole 113.

[0048] In this embodiment, the diameter of the air intake passage 111 gradually decreases from the end away from the supercharged air passage 112 to the end close to the supercharged air passage 112, and the diameter of the liquid spraying hole 113 gradually decreases from the end away from the supercharged air passage 112 to the end close to the supercharged air passage 112. In this way, since the air intake passage 111 gradually converges toward the end close to the supercharged air passage 112, the air is gradually accelerated when flowing from the air intake passage 111 to the supercharged air passage 112, so that the air flows more smoothly into the supercharged air passage 112. Since the liquid spraying hole 113 gradually radiates toward the end away from the supercharged air passage 112, when the water mist is sprayed from the liquid spraying hole 113, the water mist can be sprayed in an umbrella shape, thereby increasing the area covered by the workpiece.

[0049] The nozzle body 10 is also provided with a gas collecting chamber 13 spaced apart from the liquid channel 12, one end of the gas collecting chamber 13 is connected to the outside, and the other end of the gas collecting chamber 13 is obliquely connected to the air inlet channels 111 of the multiple gas channels 11. The external compressed air will first enter the gas collecting chamber 13, and then flow from the gas collecting chamber 13 into different air inlet channels 111 for diversion. At the same time, after the gas collecting chamber 13 is provided in the nozzle body 10, only one air pipe is needed to connect with the gas collecting chamber 13, instead of using multiple air pipes to connect with multiple gas channels 11, thereby reducing the number of pipelines.

[0050] See also Figure 4The nozzle body 10 is also provided with an air supply channel 14 spaced apart from the liquid channel 12. One end of the air supply channel 14 is connected to the outside, and the other end of the air supply channel 14 is connected to the liquid channel 12 at an angle to the upper and lower side walls opposite to the liquid injection through hole 113. In this embodiment, the air supply channel 14 is arranged at an angle, and the extension direction of the air supply channel 14 intersects with the extension direction of the liquid injection through hole 113, and the angle of intersection is an acute angle, such as Figure 4 When the air flows rapidly in the liquid spraying through hole 113, the pressure in the liquid spraying through hole 113 is small, and there is a pressure difference between the liquid spraying through hole 113 and the outside, so the air flows from the outside into the air replenishing channel 14 for air replenishment, thereby increasing the air flow in the liquid spraying through hole 113. Since the air flow rapidly flowing in the liquid spraying through hole 113 becomes larger, it is conducive to generating a greater negative pressure in the liquid spraying through hole 113, thereby sucking the liquid into the liquid spraying through hole 113.

[0051] See also Figure 3 and Figure 4 The liquid channel 12 includes an inlet channel 121 and an outlet channel 122. One end of the inlet channel 121 is connected to the outside, the other end of the inlet channel 121 is connected to the outlet channel 122, and the end of the outlet channel 122 away from the inlet channel 121 is connected to the liquid injection hole 113. Specifically, the inlet channel 121 and the outlet channel 122 are connected to form a V shape, and the angle between the extension direction of the outlet channel 122 and the extension direction of the liquid injection hole 113 is an acute angle, such as Figure 4 In this way, since the angle between the liquid injection through hole 113 and the liquid outlet flow channel 122 is an acute angle, it is beneficial for the negative pressure generated in the liquid injection through hole 113 to suck the liquid from the liquid outlet flow channel 122 into the liquid injection through hole 113.

[0052] The nozzle body 10 is also provided with a liquid storage channel 15 spaced apart from the gas channel 11. One end of the liquid storage channel 15 is connected to the outside, for example, to a water tank, and the other end of the liquid storage channel 15 is respectively connected to a plurality of liquid inlet channels 121. The liquid inlet channels 121 are connected to the outside through the liquid storage channel 15. The liquid storage channel 15 is used to store liquid. When the negative pressure nozzle 100 starts to clean the workpiece, since there is liquid stored in the liquid storage channel 15, the liquid can be immediately sprayed out from the liquid spraying through hole 113, thereby reducing the liquid discharge time of the negative pressure nozzle 100 and improving the working efficiency of the negative pressure nozzle 100.

[0053] Specifically, the nozzle body 10 is provided with a liquid inlet hole 151 and a liquid storage tank 152. One end of the liquid inlet hole 151 is connected to the outside, for example, to a water tank, and the other end of the liquid inlet hole 151 is connected to the liquid storage tank 152. One end of the liquid storage tank 152 away from the liquid inlet hole 151 is respectively connected to a plurality of liquid inlet channels 121, and the liquid inlet hole 151 and the liquid storage tank 152 are connected to form a liquid storage channel 15. The liquid storage tank 152 is used to store liquid. When the negative pressure nozzle 100 starts to clean the workpiece, since there is liquid stored in the liquid storage tank 152, the liquid can be sprayed out from the liquid spraying through hole 113 immediately.

[0054] See also Figure 2 and Figure 5 The negative pressure nozzle 100 also includes a backflow prevention component 20, which is arranged in the liquid inlet hole 151. The backflow prevention component 20 includes a backflow prevention valve 21 and a gasket 22. The backflow prevention valve 21 is made of silicone. The backflow prevention valve 21 includes a support ring body 211 and a plurality of movable parts 212. The support ring body 211 is annular and is clamped in the liquid inlet hole 151. One end of the plurality of movable parts 212 is connected to the side of the support ring body 211 facing the liquid inlet channel 121 and is connected to each other. The other ends of the plurality of movable parts 212 gather together to prevent the liquid in the liquid storage channel 15 from flowing back. The other ends of the plurality of movable parts 212 can also be separated under the action of external force to allow external liquid to flow into the liquid storage channel 15. When the negative pressure nozzle 100 is working, when the liquid flows into the liquid inlet hole 151 from the outside, it will flush the plurality of movable parts 212 and flow into the liquid storage tank 152. When the negative pressure nozzle 100 stops working, the multiple movable parts 212 are re-adapted together to prevent the liquid in the liquid storage tank 152 from flowing back. The gasket 22 is arranged in the liquid inlet hole 151 and abuts against the side of the support ring body 211 away from the multiple movable parts 212, and the gasket 22 supports the support ring body 211.

[0055] The working process of the negative pressure nozzle 100 provided in the embodiment of the present application is roughly as follows:

[0056] First, compressed air is introduced into the air collecting chamber 13. After passing through the air collecting chamber 13, the air enters multiple air inlet channels 111 respectively. The air is gradually accelerated along the air inlet channel 111 and flows into the boost air channel 112, and then flows into the liquid spray hole 113 from the boost air channel 112. Since the air flow rate in the liquid spray hole 113 is fast, the pressure in the liquid spray hole 113 is small at this time, and there will be a pressure difference between the liquid spray hole 113 and the liquid channel 12. The negative pressure in the liquid spray hole 113 will suck the liquid into the liquid storage channel 15 and the liquid channel 12, and then suck it into the liquid spray hole 113 from the liquid channel 12. At the same time, the negative pressure in the liquid spray hole 113 will suck the external air into the liquid spray hole 113 through the air replenishment channel 14 for air replenishment, thereby increasing the flow rate of gas in the liquid spray hole 113. When the liquid enters the spray hole 113, the liquid and air merge and break up the liquid into water mist. Since the spray hole 113 is radial from one end close to the boost air duct 112 to the end far from the boost air duct 112, the water mist is sprayed out from the nozzle body 10 in an umbrella shape to clean the workpiece.

[0057] Since a plurality of liquid spraying holes 113 are provided on the nozzle body 10, the cleaning area of ​​the negative pressure nozzle 100 is increased, so that the negative pressure nozzle 100 only needs to perform one cleaning operation to clean the debris and impurities on the surface of the workpiece, thereby improving the working efficiency of the negative pressure nozzle 100. Since the water mist is sprayed out in an umbrella shape, it is beneficial to increase the cleaning area of ​​the water mist, thereby covering the surface of the workpiece. Since the negative pressure nozzle 100 does not need to clean the workpiece back and forth, it avoids secondary splashing of debris and impurities onto the workpiece, thereby avoiding scratches on the surface of the workpiece. In addition, since the nozzle body 10 is provided with an air supply channel 14, the external air can supply air to the liquid spraying hole 113 through the air supply channel 14. Since the air flow rate of the fast-flowing air in the liquid spraying hole 113 becomes larger, it is beneficial to generate a greater negative pressure in the liquid spraying hole 113, thereby sucking the liquid into the liquid spraying hole 113. When the air enters the boost air duct 112, the air flow rate increases due to the small aperture of the boost air duct 112. When the air flows from the boost air duct 112 into the spray hole 113, the air pressure is released and the instantaneous flow rate of the air increases, which is beneficial to increase the negative pressure in the spray hole 113.

[0058] The present application also provides a cleaning device, which includes a liquid box, an air source and the above-mentioned negative pressure nozzle 100, wherein the liquid box is connected to the liquid channel 12 through a pipeline, and the air source is connected to the gas channel 11 through an air pipe to allow compressed air to enter the gas channel 11.

[0059] The present application also provides a processing equipment, which includes a tool, a fixture and the above-mentioned cleaning device, the fixture is used to clamp the product, the tool processes the product, and the negative pressure nozzle 100 sprays liquid to the processed product for cleaning.

[0060] It is obvious to those skilled in the art that the present application is not limited to the details of the exemplary embodiments described above, and that the present application can be implemented in other specific forms without departing from the spirit or essential features of the present application. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present application is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present application.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present application and are not intended to limit it. Although the present application has been described in detail with reference to the preferred embodiments, a person of ordinary skill in the art should understand that the technical solution of the present application may be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present application.

Claims

1. A negative pressure nozzle, characterized in that: The invention comprises a nozzle body, in which a plurality of spaced-apart gas channels, a plurality of spaced-apart liquid channels and a plurality of spaced-apart liquid spraying holes are provided, the plurality of gas channels are horizontally connected with the plurality of liquid spraying holes respectively, the plurality of liquid channels are obliquely connected with the plurality of liquid spraying holes respectively, one end of the plurality of liquid channels is connected with the outside for liquid intake, one end of the plurality of gas channels is connected with the outside for compressed air to suck the liquid in the corresponding liquid channels into the liquid spraying holes and spray out the nozzle body.

2. The negative pressure nozzle according to claim 1, characterized in that: The gas channel includes an intake channel and a boost channel connected in sequence, the intake channel is connected to the outside, the liquid injection through hole is horizontally connected to the boost channel, and the cross-sectional area of ​​the boost channel is smaller than the cross-sectional areas of the intake channel and the liquid injection through hole.

3. The negative pressure nozzle according to claim 2, characterized in that: The aperture of the air intake passage gradually decreases from one end away from the supercharged air passage to one end close to the supercharged air passage; the aperture of the liquid injection through hole gradually decreases from one end away from the supercharged air passage to one end close to the supercharged air passage.

4. The negative pressure nozzle according to claim 2, characterized in that: The nozzle body is further provided with a gas collecting chamber spaced apart from the liquid channel, one end of the gas collecting chamber is communicated with the outside, and the other end of the gas collecting chamber is respectively connected with the gas inlet channels of the plurality of gas channels at an angle.

5. The negative pressure nozzle according to claim 2, characterized in that: The nozzle body is further provided with an air supply channel, one end of which is connected to the outside, and the other end of which is connected to the liquid channel at an angle to the upper and lower side walls opposite to the liquid spraying through hole.

6. The negative pressure nozzle according to claim 2, characterized in that: The liquid channel includes an inlet channel and an outlet channel, one end of the inlet channel is connected to the outside, the other end of the inlet channel is connected to the outlet channel, and the end of the outlet channel away from the inlet channel is connected to the liquid injection hole.

7. The negative pressure nozzle according to claim 6, characterized in that: The nozzle body is also provided with a liquid storage channel spaced apart from the gas channel, one end of the liquid storage channel is connected to the outside, the other end of the liquid storage channel is connected to a plurality of liquid inlet channels respectively, the liquid inlet channel is connected to the outside through the liquid storage channel, and the liquid storage channel is used to store liquid.

8. The negative pressure nozzle according to claim 7, characterized in that: The negative pressure nozzle also includes an anti-backflow component, and the anti-backflow component includes: The anti-backflow valve comprises a support ring body and a plurality of movable parts, wherein the support ring body is arranged at one end of the liquid storage channel, one end of the plurality of movable parts is connected to a side of the support ring body facing the liquid inlet channel, and the other ends of the plurality of movable parts gather together to prevent the liquid in the liquid storage channel from flowing back, and can also move away from each other under the action of an external force to allow external liquid to flow into the liquid storage channel; The gasket is arranged in the liquid storage channel and abuts against a side of the support ring body away from the plurality of movable parts.

9. A cleaning device, characterized in that: It comprises a liquid box, an air source and the negative pressure nozzle according to any one of claims 1 to 8, wherein the liquid box is connected to the liquid channel, and the air source is connected to the gas channel so that compressed air enters the gas channel.

10. A processing equipment, characterized in that: It comprises a tool, a fixture and the cleaning device as claimed in claim 9, wherein the fixture is used to clamp the product, the tool processes the product, and the negative pressure nozzle sprays the liquid to clean the processed product.

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