CN210474367U

CN210474367U - Back connection type nozzle

Info

Publication number: CN210474367U
Application number: CN201920809828.XU
Authority: CN
Inventors: 聂海龙; 王院飞; 范志宏
Original assignee: Mideler Fog Systems Guangzhou Co ltd
Current assignee: Mideler Fog Systems Guangzhou Co ltd
Priority date: 2019-05-30
Filing date: 2019-05-30
Publication date: 2020-05-08
Anticipated expiration: 2029-05-30

Abstract

The utility model discloses a back connection type nozzle, including the support, set up the conveying subassembly that is used for leading-in gas and liquid on the support, be used for carrying out the leading-in gas of conveying subassembly and liquid and mixing assembly and be arranged in with gas and the liquid of mixing assembly with water smoke form spun spraying subassembly, conveying subassembly sets up the one end of support, spraying subassembly sets up in the support with the other end that conveying subassembly is relative. The utility model discloses a nozzle can dwindle radial dimension greatly through setting up air inlet and water inlet at the tip of this nozzle, can get into the more narrow and small position in space and carry out the operation to connect the easy airtight protection in position, avoid droplet and the dirty gathering of dirt and influence the spraying quality.

Description

Back connection type nozzle

Technical Field

The utility model relates to a atomizer, concretely relates to back connection formula nozzle.

Background

The spraying device is a spraying device which is a device for setting a predetermined pressure to a liquid and a gas so that the gas and the liquid are sufficiently mixed in a mixing chamber and spraying the mixed gas and liquid in the form of water mist. For example, the utility model patent publication No. CN205436087U discloses a "two-fluid spraying apparatus" comprising an air intake assembly, a water intake assembly, a mixing assembly, a breaking target nail and a spraying assembly; the mixing component is hollow to form a water-gas mixing cavity; outlets of the air inlet assembly and the water inlet assembly are communicated with a mixing cavity of the mixing assembly; the outlet of the mixing assembly is communicated with the spraying assembly; the part of the breaking target nail is inserted into the mixing assembly and is used for breaking water introduced by the water inlet assembly. This two-fluid atomizer adopts the two-fluid internal mixing design for gas-liquid mixture is more even, thereby improves the requirement of the particle diameter of aerial fog granule. For another example, the utility model patent of grant bulletin No. CN204320531U discloses "a spraying nozzle", spraying nozzle includes that shower nozzle base, liquid emit, back lid, jump ring and a plurality of sealing washer 15, liquid emits the setting and is in the front end of shower nozzle base, liquid emits and is provided with water jet and air jet, the back lid sets up the rear end of shower nozzle base, the jump ring sets up in the cavity of shower nozzle base, the rear end of shower nozzle base is connected and is provided with the pullback spring, the pullback spring is provided with the governing valve, the governing valve is connected and is set up the outside adjusting nut of shower nozzle base, the both ends of shower nozzle base are provided with water inlet and air inlet respectively. The spray nozzle is simple in structure, the spray amount can be adjusted through the adjusting nut, and a good spray effect is achieved through a good sealing effect.

However, the positions of the air inlet and the water inlet in the spraying device and the spraying nozzle are arranged on different sides, wherein the air inlet assembly of the spraying device in the first patent document is arranged on the end surface of the spraying device, and the water inlet assembly is arranged on the side surface of the spraying device; the water inlet in the second patent document is located at the upper side of the side surface of the spraying base, and the air inlet is located at the lower side of the side surface of the spraying base, and both the water inlet and the air inlet need to be provided with a joint at the side surface of the spraying device, so that the radial size of the spraying device is large, and thus, when the spraying device and the spraying nozzle need to penetrate through the through hole or the notch and then extend into a specific position for operation, such as pipeline spraying, the spraying device and the spraying nozzle cannot enter into a position with an excessively small space for operation, such as a pipe with an inner diameter within 80mm in the prior art cannot enter into; in addition, the joint part arranged on the side surface is in an exposed state, and fog is easy to generate and gather at the joint part to form water drops, and dust and dirt are easy to gather at the joint part, so that the spraying quality is influenced.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art not enough, provide a back connection formula nozzle, atomizer can reduce the radial dimension greatly through the tip with air inlet and water inlet setting at this atomizer, can get into the more narrow and small position in space and carry out the operation to connect the easy airtight protection in position, avoid droplet and dirt gathering and influence the spraying quality.

The utility model provides a technical scheme of above-mentioned technical problem is:

a back connection type nozzle comprises a support, a conveying assembly, a mixing assembly and a spraying assembly, wherein the conveying assembly is arranged on the support and used for introducing gas and liquid, the mixing assembly is used for mixing the gas and the liquid introduced by the conveying assembly, the spraying assembly is used for spraying the gas and the liquid in the mixing assembly in a water mist mode, the conveying assembly is arranged at one end of the support, and the spraying assembly is arranged at the other end, opposite to the conveying assembly, in the support;

the conveying assembly comprises an air inlet assembly and a water inlet assembly, wherein the air inlet assembly is installed on the support and used for introducing air, the water inlet assembly is used for introducing liquid, and the air inlet connector of the air inlet assembly and the air inlet pipe and the water inlet connector of the water inlet assembly and the water inlet pipe are both positioned on the same end surface of the support; the air inlet assembly is communicated with the mixing assembly through an air inlet pipeline, and the water inlet assembly is communicated with the mixing assembly through a water inlet pipeline; the mixing assembly is in communication with the spray assembly.

Preferably, the spraying assembly comprises an air cap and a compression nut for mounting the air cap on the support, wherein the air cap is provided with a gas-liquid mixing cavity, and the gas-liquid mixing cavity forms the mixing assembly; the air cap is also provided with a spray nozzle communicated with the gas-liquid mixing cavity; the inlet of the gas-liquid mixing cavity is respectively connected with the outlets of the water inlet pipeline and the air inlet pipeline, and the outlet of the gas-liquid mixing cavity is communicated with the spray nozzle; the diameter of the gas-liquid mixing cavity is larger than that of the spray opening.

Preferably, the one end adapter sleeve who corresponds with connector and the water inlet connector of admitting air in the support, this sleeve pipe and support sealing connection, connector, intake pipe, water inlet connector and inlet tube all set up in the sleeve pipe. On one hand, the whole spraying device is fixed on the sleeve by connecting the sleeve with the support, so that the spraying device can be extended into a narrow space (such as a pipeline) by using the sleeve for operation, and the operation is quite convenient; on the other hand, because sleeve pipe and support sealing connection, and air inlet connector, intake pipe, water inlet connector and inlet tube all set up in the sleeve pipe, consequently air inlet connector and water inlet connector do not expose to the fog when with the operation separates, avoids fog gathering in joint department and influence the spraying quality.

Preferably, a liquid cap is arranged between the water inlet pipeline and the gas-liquid mixing cavity, the liquid cap is mounted on the support, a communication opening for communicating the water inlet pipeline and the gas-liquid mixing cavity is formed in the liquid cap, and the diameter of the communication opening is smaller than that of the water inlet pipeline and the gas-liquid mixing cavity.

Preferably, the water inlet assembly further comprises a thimble assembly arranged in the water inlet pipeline and used for automatically closing or opening the communication port, the thimble assembly comprises a thimble and a driving mechanism used for driving the thimble to do transverse movement so as to block or release the communication port, the thimble is horizontally arranged, and a blocking part matched with the communication port is arranged at a position corresponding to the communication port; the support with actuating mechanism's corresponding position department is provided with the mounting groove, actuating mechanism sets up in the mounting groove.

Preferably, the driving mechanism comprises a diaphragm, a diaphragm guard plate and a spring which are arranged on the end part of the thimble far away from the blocking part, wherein a shaft shoulder is arranged on the end part of the thimble far away from the blocking part, and the diameter of the shaft shoulder is larger than that of the thimble; the diaphragm sheet and the diaphragm sheet guard plate are sequentially sleeved on the ejector pin, the diaphragm sheet is in contact with the shaft shoulder, the diaphragm sheet and the diaphragm sheet guard plate are fixed on the ejector pin through a locking nut, and an external thread matched with the internal thread of the locking nut is arranged on the end part of the ejector pin far away from the plugging part; the diameter of the diaphragm is larger than the inner diameter of the mounting groove, and the upper end and the lower end of the diaphragm are respectively connected with the support; the spring is arranged in the mounting groove, one end of the spring acts on the support, the other end of the spring acts on the diaphragm sheet protective plate, and the elastic force of the spring enables the plugging portion of the thimble to extend into the communicating port to plug the communicating port.

Preferably, the support comprises first spraying main part and second spraying main part, air inlet connector and water inlet connector all set up in the first spraying main part, and spraying subassembly and mixing assembly then set up in second spraying main part, through a plurality of water conservancy diversion counter bore screwed connection between first spraying main part and the second spraying main part, the vertical setting of water conservancy diversion counter bore screw, and stretch into respectively in inlet channel and the inlet channel, wherein, the water conservancy diversion counter bore screw that stretches into in the inlet channel is first water conservancy diversion counter bore screw, and the water conservancy diversion counter bore screw that stretches into in the inlet channel is second water conservancy diversion counter bore screw.

Preferably, the water inlet pipeline comprises a first water inlet pipeline arranged on the first spraying main body, a second water inlet pipeline arranged on the second spraying main body and a third water inlet pipeline used for connecting the first water inlet pipeline and the second water inlet pipeline, wherein the third water inlet pipeline is arranged inside the first diversion counter bore screw and extends vertically downwards, the first diversion counter bore screw is respectively provided with a first communication hole at a position contacted with the first water inlet pipeline and the second water inlet pipeline, and the first communication hole is communicated with the third water inlet pipeline; the ejector pin assembly is arranged in the second water inlet pipeline.

Preferably, the air inlet pipeline comprises a first air inlet pipeline arranged on the first spraying main body, a second air inlet pipeline arranged on the second spraying main body and a third air inlet pipeline used for connecting the first air inlet pipeline and the second air inlet pipeline, wherein the third air inlet pipeline is arranged inside the second diversion counterbore screw and vertically extends downwards, the second diversion counterbore screw is respectively provided with a second communication hole at the position contacting with the first air inlet pipeline and the second air inlet pipeline, and the second communication hole is communicated with the third air inlet pipeline.

The utility model discloses a theory of operation of back connection type nozzle is:

because the utility model discloses a subassembly of intaking and the subassembly of admitting air of nozzle all set up on the same terminal surface of support (be located the back of nozzle promptly) and with the spraying subassembly sets up relatively, consequently, works as the utility model discloses a during external inlet tube of nozzle and intake pipe, this inlet tube and intake pipe can not be right the utility model discloses a diameter of nozzle has any influence, can not increase promptly the utility model discloses a nozzle's external diameter makes the utility model discloses a nozzle can carry out the spraying operation to particular position through-hole or incision smoothly. During the operation, external inlet tube with water inlet assembly connects, and the intake pipe then is connected with air inlet assembly, and wherein, the liquid of carrying in the inlet tube enters into mixing assembly through the inlet channel, and the gas in the intake pipe enters into mixing assembly through air inlet conduit, and the gas and the liquid that will mix through spraying assembly at last are with the form blowout of water smoke to accomplish the spraying operation.

Compared with the prior art, the utility model following beneficial effect has:

1. because the utility model discloses a water inlet connector and the air inlet connector of nozzle all set up the same one end of support and with the spraying subassembly sets up relatively, consequently, works as the utility model discloses a during external inlet tube of nozzle and intake pipe, this inlet tube and intake pipe can not be right the utility model discloses a diameter of nozzle has any influence, can not increase promptly the utility model discloses a nozzle's external diameter for the radial dimension of nozzle is less, consequently can get into the narrow and small position in space (like in the pipeline) and carry out the operation.

2. Because the utility model discloses a water inlet connector and the connector that admits air of nozzle all set up the same one end of support, consequently under the prerequisite that does not increase radial dimension, set up protection architecture at the tip of support easily and get up the protection of water inlet connector and the connector that admits air and make it not expose, avoid joint department droplet and dirt gathering and influence the spraying quality.

Drawings

Fig. 1 is a schematic structural diagram of a back-connected nozzle according to an embodiment of the present invention, in which fig. 1 is a front view and fig. 2 is a schematic perspective structural diagram.

Fig. 3 is a schematic diagram of the structure of the spray assembly and the mixing assembly.

FIG. 4 is a schematic structural view of the ejector pin assembly.

Fig. 5 is a diagram of the movement traces of the gas and the liquid of the back-coupled nozzle of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the following examples and drawings, but the present invention is not limited thereto.

Referring to fig. 1 to 5, the back connection type nozzle of the present invention includes a support, a delivery assembly disposed on the support for introducing gas and liquid, a mixing assembly for mixing the gas and liquid introduced by the delivery assembly, and a spraying assembly for spraying the gas and liquid in the mixing assembly in the form of water mist, wherein the delivery assembly is disposed at one end of the support, and the spraying assembly is disposed at the other end of the spraying body opposite to the delivery assembly;

the conveying assembly comprises an air inlet assembly and a water inlet assembly, wherein the air inlet assembly is installed on the support and used for introducing air, the water inlet assembly is used for introducing liquid, and the air inlet assembly and an air inlet connector 1-1 of an air inlet pipe and a water inlet connector 1-2 of a water inlet pipe are both located on the same end face of the support; the air inlet assembly is communicated with the mixing assembly through an air inlet pipeline, and the water inlet assembly is communicated with the mixing assembly through a water inlet pipeline; the mixing assembly is in communication with the spray assembly.

Referring to fig. 1-5, one end of the support corresponding to the air inlet connector 1-1 and the water inlet connector 1-2 is connected with a sleeve (not shown in the drawings of the specification), the sleeve is mounted on the support through a locking screw, and the support is provided with a mounting hole 8 at a position corresponding to the locking screw; the sleeve is connected with the support in a sealing mode, and the air inlet connector 1-1, the air inlet pipe, the water inlet connector 1-2 and the water inlet pipe are all arranged in the sleeve. The nozzle has the advantages that on one hand, the whole nozzle is fixed on the sleeve by connecting the sleeve with the support, so that the nozzle can extend into a long and narrow space (such as a pipeline) to operate by using the sleeve, and the operation is quite convenient; on the other hand, the sleeve is hermetically connected with the support, and the air inlet connector 1-1, the air inlet pipe, the water inlet connector 1-2 and the water inlet pipe are all arranged in the sleeve, so that the air inlet connector 1-1 and the water inlet connector 1-2 are not exposed, and are separated from mist during operation, and the mist is prevented from gathering at the connector to influence the spraying quality.

Referring to fig. 1-5, the spray assembly comprises an air cap 6 and a gland nut 7 for mounting the air cap 6 on the support, wherein an air-liquid mixing chamber 6-1 is arranged on the air cap 6, and the air-liquid mixing chamber 6-1 forms the mixing assembly; the air cap 6 is also provided with a spray nozzle 6-2 communicated with the gas-liquid mixing cavity 6-1; wherein, the inlet of the gas-liquid mixing cavity 6-1 is respectively connected with the outlets of the water inlet pipeline and the air inlet pipeline, and the outlet of the gas-liquid mixing cavity 6-1 is communicated with the spray opening 6-2; the diameter of the gas-liquid mixing cavity 6-1 is larger than that of the spray opening 6-2. Thus, when the gas and liquid in the gas-liquid mixing chamber 6-1 enter the spray opening 6-2, the speed of the mixed gas and liquid increases but the pressure decreases, so that the liquid and gas are mixed more uniformly, and the particle size of the spray particles can be controlled effectively.

Referring to fig. 1-5, the air inlet connector 1-1 and the water inlet connector 1-2 are both internally threaded holes formed in the support. Thus, the connection between the water inlet pipe and the water inlet connector 1-2 on the support is realized in a threaded connection mode, and the air inlet pipe is connected with the air inlet connector 1-1 on the support.

Referring to fig. 1-5, a liquid cap 5 is arranged between the water inlet pipeline and the gas-liquid mixing chamber 6-1, the liquid cap 5 is mounted on the support, a communication port 5-1 for communicating the water inlet pipeline and the gas-liquid mixing chamber 6-1 is arranged on the liquid cap 5, and the diameter of the communication port 5-1 is smaller than that of the water inlet pipeline and the gas-liquid mixing chamber 6-1. The purpose is that when the liquid enters the communication opening 5-1 from the water inlet pipeline, the speed of the liquid is increased but the pressure is reduced, and when the liquid enters the gas-liquid mixing cavity 6-1 from the communication opening 5-1, the speed of the liquid is reduced but the pressure is increased, so that the liquid and the gas are fully mixed in the gas-liquid mixing cavity 6-1, and the spraying effect is further enhanced.

Referring to fig. 1-5, the water inlet assembly further includes a thimble assembly disposed in the water inlet pipe and used for automatically closing or opening the communication port 5-1, the thimble assembly includes a thimble 2 and a driving mechanism for driving the thimble 2 to move transversely to block or release the communication port 5-1, wherein the thimble 2 is disposed horizontally, and a blocking portion matched with the communication port 5-1 is disposed at a position corresponding to the communication port 5-1; the support with actuating mechanism's corresponding position department is provided with the mounting groove, actuating mechanism sets up in the mounting groove. Therefore, when spraying operation is required, the driving mechanism drives the thimble 2 to move, so that the blocking part of the thimble 2 is separated from the communication opening 5-1, and liquid in the water inlet pipeline can enter the gas-liquid mixing cavity 6-1 through the communication opening 5-1 to be mixed with gas to form water mist and be sprayed out. After the spraying operation is finished, the driving mechanism drives the thimble 2 to move, so that the plugging part of the thimble 2 is matched with the communication port 5-1, the communication port 5-1 is closed, and the liquid in the water inlet pipeline cannot pass through the communication port 5-1 to enter the gas-liquid mixing cavity 6-1, thereby realizing the closing of the nozzle of the utility model.

Referring to fig. 1-5, the driving mechanism comprises a diaphragm 12, a diaphragm guard 13 and a spring 10, which are arranged on the end of the thimble 2 far away from the plugging portion, wherein the thimble 2 is provided with a shoulder 2-1 at the end far away from the plugging portion, and the diameter of the shoulder 2-1 is larger than that of the thimble 2; the diaphragm sheet 12 and the diaphragm sheet guard plate 13 are sequentially sleeved on the ejector pin 2, the diaphragm sheet 12 is in contact with the shaft shoulder 2-1, the diaphragm sheet 12 and the diaphragm sheet guard plate 13 are fixed on the ejector pin 2 through a locking nut 14, and an external thread matched with the internal thread of the locking nut 14 is arranged on the end part, far away from the plugging part, of the ejector pin 2; the diameter of the diaphragm 12 is larger than the inner diameter of the mounting groove, and the upper end and the lower end of the diaphragm 12 are respectively connected with the support; the spring 10 is arranged in the mounting groove, one end of the spring 10 acts on the support, the other end of the spring 10 acts on the diaphragm sheet protective plate 13, and the elastic force of the spring 10 enables the blocking part of the thimble 2 to extend into the communication opening 5-1 to block the communication opening 5-1. When the nozzle of the present invention is not in operation, the plugging portion of the thimble 2 is tightly pressed against the communicating opening 5-1 of the liquid cap 5 under the elastic force of the spring 10, so that the communicating opening 5-1 is in a closed state. When the utility model discloses a nozzle during operation, the liquid of input enters into the inlet channel in the external inlet tube, and along with the increase of the liquid in the inlet channel, its inside pressure also increases gradually to make diaphragm 12 take place to warp and make thimble 2 overcome the elastic movement of spring 10, and then make the shutoff portion of thimble 2 with the intercommunication mouth 5-1 separation of liquid cap 5, like this, liquid in the inlet channel just can enter into in the gas-liquid mixing chamber 6-1 through this intercommunication mouth 5-1. When the utility model discloses a nozzle accomplishes the during operation, the inlet tube stops to inlet channel output liquid, makes pressure in the inlet channel diminishes, and is less than spring 10's elasticity for compression state's spring 10 reconversion gradually makes diaphragm 12 reconversion, and at this in-process, thimble 2 is also in horizontal motion is done under spring 10 and diaphragm 12's the spring action for this thimble 2's shutoff portion supports tightly again intercommunication mouth 5-1 department of liquid cap 5, thereby closes intercommunication mouth 5-1, realizes the utility model discloses a closing of nozzle.

Referring to fig. 1-5, the support is composed of a first spraying main body 1 and a second spraying main body 3, the air inlet connector 1-1 and the water inlet connector 1-2 are both arranged on the first spraying main body 1, the spraying assembly and the mixing assembly are arranged on the second spraying main body 3, the first spraying main body 1 and the second spraying main body 3 are connected through a plurality of diversion counter bore screws, the diversion counter bore screws are vertically arranged and respectively extend into the water inlet pipeline and the air inlet pipeline, wherein the diversion counter bore screws extending into the water inlet pipeline are first diversion counter bore screws 4, and the diversion counter bore screws extending into the air inlet pipeline are second diversion counter bore screws 11. The purpose of setting up above-mentioned structure lies in making things convenient for the inside thimble assembly's of support installation and maintenance.

Referring to fig. 1 to 5, the water inlet pipe includes a first water inlet pipe 1-3 provided on a first spray body 1, a second water inlet pipe 3-1 provided on a second spray body 3, and a third water inlet pipe 4-2 for connecting the first water inlet pipe 1-3 and the second water inlet pipe 3-1, wherein the third water inlet pipe 4-2 is provided in the first guide counterbore screw 4, and the first guide counterbore screw 4 is provided with 4-1 at a position contacting the first water inlet pipe 1-3 and the second water inlet pipe 3-1, respectively; the ejector pin assembly is arranged in the second water inlet pipeline 3-1. Thus, liquid enters from the water inlet connector 1-2 and then sequentially enters the gas-liquid mixing cavity 6-1 through the first water inlet pipeline 1-3, the third water inlet pipeline 4-2 and the second water inlet pipeline 3-1. And the first water conservancy diversion counter bore screw 4 not only is as the connecting piece of connecting first spraying main part 1 and second spraying main part 3, but also acts as the third inlet channel 4-2 that is used for connecting first inlet channel 1-3 and second inlet channel 3-1, makes designer can rationally arrange the position between water inlet assembly, air inlet assembly and the spraying subassembly on the support, so that reduce as far as possible the utility model discloses a nozzle's volume.

Referring to fig. 1 to 5, the air inlet pipe includes a first air inlet pipe 1-4 disposed on the first spray main body 1, a second air inlet pipe 3-2 disposed on the second spray main body 3, and a third air inlet pipe 11-2 for connecting the first air inlet pipe 1-4 and the second air inlet pipe 3-2, wherein the third air inlet pipe 11-2 is disposed in the second flow guide counterbore screw 11, and the second flow guide counterbore screw 11 is provided with a second communication hole 11-1 at a position contacting the first air inlet pipe 1-4 and the second air inlet pipe 3-2, respectively.

Referring to fig. 1-5, sealing rings 9 are disposed between the liquid cap 5, the first flow guiding counter bore screw 4, the second flow guiding counter bore screw 11 and the support. Therefore, sealing can be realized, liquid and gas in the water inlet pipeline and the gas inlet pipeline are prevented from leaking, and meanwhile, in order to ensure the pressure in the support, the gas and the liquid are mixed more uniformly in the gas-liquid mixing cavity 6-1.

Referring to fig. 1-5, the back connection nozzle of the present invention has the following working principle:

because the utility model discloses a subassembly of intaking and the subassembly of admitting air of nozzle all set up the support with one side and with the spraying subassembly sets up relatively, consequently, work as the utility model discloses a during external inlet tube of nozzle and intake pipe, this inlet tube and intake pipe can not be right the utility model discloses a diameter of nozzle has any influence, can not increase promptly the utility model discloses a nozzle's external diameter makes the utility model discloses a nozzle can carry out the spraying operation to particular position through-hole or incision smoothly. During the operation, external inlet tube with water inlet assembly connects, and the intake pipe then is connected with air inlet assembly, and wherein, the liquid of carrying in the inlet tube enters into mixing assembly through the inlet channel, and the gas in the intake pipe enters into mixing assembly through air inlet conduit, and the gas and the liquid that will mix through spraying assembly at last are with the form blowout of water smoke to accomplish the spraying operation.

The above is the preferred embodiment of the present invention, but the embodiment of the present invention is not limited by the above, and any other changes, modifications, substitutions, blocks, and simplifications which do not depart from the spirit and principle of the present invention should be equivalent replacement modes, and all are included in the scope of the present invention.

Claims

1. A back-connected nozzle comprising a support, a delivery assembly arranged on the support for introducing gas and liquid, a mixing assembly for mixing the gas and liquid introduced by the delivery assembly, and a spray assembly for spraying the gas and liquid in the mixing assembly in the form of a mist, wherein the delivery assembly is arranged at one end of the support and the spray assembly is arranged at the other end of the support opposite to the delivery assembly;

2. The back-attachment nozzle of claim 1, wherein the spray assembly comprises an air cap and a compression nut mounting the air cap on the support, wherein the air cap is provided with a gas-liquid mixing chamber that forms the mixing assembly; the air cap is also provided with a spray nozzle communicated with the gas-liquid mixing cavity; the inlet of the gas-liquid mixing cavity is respectively connected with the outlets of the water inlet pipeline and the air inlet pipeline, and the outlet of the gas-liquid mixing cavity is communicated with the spray nozzle; the diameter of the gas-liquid mixing cavity is larger than that of the spray opening.

3. The back-connected nozzle of claim 1, wherein an end of the support corresponding to the air inlet connector and the water inlet connector is connected to a sleeve, the sleeve is hermetically connected to the support, and the air inlet connector, the air inlet pipe, the water inlet connector and the water inlet pipe are all disposed in the sleeve.

4. The back-connection nozzle of claim 2, wherein a liquid cap is disposed between the inlet conduit and the gas-liquid mixing chamber, the liquid cap being mounted on the support and having a communication opening communicating the inlet conduit with the gas-liquid mixing chamber, the communication opening having a diameter less than the diameters of the inlet conduit and the gas-liquid mixing chamber.

5. The back-connected nozzle according to claim 4, wherein the water inlet assembly further comprises a thimble assembly disposed in the water inlet pipe for automatically closing or opening the communication port, the thimble assembly comprises a thimble and a driving mechanism for driving the thimble to move laterally to block or release the communication port, wherein the thimble is disposed horizontally, and a blocking portion engaged with the communication port is disposed at a position corresponding to the communication port; the support with actuating mechanism's corresponding position department is provided with the mounting groove, actuating mechanism sets up in the mounting groove.

6. The back-attachment nozzle of claim 5, wherein the actuating mechanism comprises a diaphragm, a diaphragm guard, and a spring disposed on an end of the thimble distal from the blocking portion, wherein the thimble is provided with a shoulder at the end distal from the blocking portion, the shoulder having a diameter greater than a diameter of the thimble; the diaphragm sheet and the diaphragm sheet guard plate are sequentially sleeved on the ejector pin, the diaphragm sheet is in contact with the shaft shoulder, the diaphragm sheet and the diaphragm sheet guard plate are fixed on the ejector pin through a locking nut, and an external thread matched with the internal thread of the locking nut is arranged on the end part of the ejector pin far away from the plugging part; the diameter of the diaphragm is larger than the inner diameter of the mounting groove, and the upper end and the lower end of the diaphragm are respectively connected with the support; the spring is arranged in the mounting groove, one end of the spring acts on the support, the other end of the spring acts on the diaphragm sheet protective plate, and the elastic force of the spring enables the plugging portion of the thimble to extend into the communicating port to plug the communicating port.

7. The back-connected nozzle of claim 6, wherein the support comprises a first spray body and a second spray body, the air inlet connector and the water inlet connector are both disposed on the first spray body, the spray assembly and the mixing assembly are disposed on the second spray body, the first spray body and the second spray body are connected by a plurality of diversion counter bore screws, the diversion counter bore screws are vertically disposed and respectively extend into the water inlet pipeline and the air inlet pipeline, wherein the diversion counter bore screws extending into the water inlet pipeline are first diversion counter bore screws, and the diversion counter bore screws extending into the air inlet pipeline are second diversion counter bore screws.

8. The back-connection nozzle according to claim 7, wherein the water inlet pipe comprises a first water inlet pipe provided on the first spray body, a second water inlet pipe provided on the second spray body, and a third water inlet pipe for connecting the first water inlet pipe and the second water inlet pipe, wherein the third water inlet pipe is provided inside the first deflector counter bore screw and extends vertically downward, the first deflector counter bore screw is provided with first communication holes at positions contacting the first water inlet pipe and the second water inlet pipe, respectively, the first communication holes being communicated with the third water inlet pipe; the ejector pin assembly is arranged in the second water inlet pipeline.

9. The back-connection nozzle according to claim 7, wherein the air inlet duct comprises a first air inlet duct provided on the first spray body, a second air inlet duct provided on the second spray body, and a third air inlet duct for connecting the first air inlet duct and the second air inlet duct, wherein the third air inlet duct is provided inside the second deflector counterbore screw and extends vertically downward, the second deflector counterbore screw is provided with a second communication hole at a position contacting the first air inlet duct and the second air inlet duct, respectively, and the second communication hole communicates with the third air inlet duct.

10. The back-connection nozzle of claim 7, wherein sealing rings are disposed between the liquid cap, the first and second flow-directing counter-bore screws, and the support.