A linkage controlled gas-liquid two-phase nozzle, control method and spraying device

Abstract

The invention discloses a linkage control type gas-liquid two-phase nozzle, a control method and a spraying device; the nozzle comprises a nozzle body, a pneumatic control cavity and a gas-liquid mixed flow cavity; the nozzle body comprises a liquid inlet, a liquid flow control port and a liquid outlet flow channel; the pneumatic control cavity is installed at the liquid flow control port, and the gas-liquid mixed flow cavity is installed on the liquid outlet flow channel; the pneumatic control cavity comprises an air inlet pipe I, an air outlet pipe, a main flow channel, a branch flow channel and a pressure chamber; the air inlet pipe I, the main flow channel and the air outlet pipe are connected, a control plug and a guide sealing frame are installed in the pressure chamber, the guide sealing frame is fixed on the end face of the liquid flow control port, a spring is arranged between the guide sealing frame and the control plug, the control plug moves toward the liquid flow control port along the inner circle of the guide sealing frame under the action of gas pressure, and seals the liquid flow control port, and at the same time, the control plug can be reset under the action of the spring; the gas-liquid mixed flow cavity comprises a liquid flow chamber and an air inlet pipe II, the air inlet pipe II is connected to the air outlet pipe, and an electromagnetic on-off valve is arranged on the pipeline.

Description

Technical Field

[0001] The invention belongs to the technical field of atomizing nozzles, and in particular relates to a linkage-controlled gas-liquid two-phase nozzle, a control method and a spraying device. Background Art

[0002] In the spraying operation of industrial and agricultural production, the atomization effect and control accuracy of the nozzle are important indicators that determine the spraying quality and measure the technical level of the nozzle. The gas-liquid two-phase nozzle has obvious advantages over the ordinary nozzle atomization. However, the existing gas-liquid two-phase nozzle is to achieve independent control of a single nozzle. Therefore, the liquid flow channel and the gas flow channel are two independent pipelines before the gas-liquid mixing. The existing technology needs to set on-off valves in the liquid circuit and the gas circuit respectively, and synchronously control the two valves to achieve synchronous on-off control of the liquid flow channel and the gas flow channel. At the same time, the solenoid valve that controls the on-off of the liquid flow channel is mostly directly designed on the liquid flow channel, which increases the difficulty of maintenance of the solenoid valve and reduces its service life. Summary of the invention

[0003] In view of the shortcomings of the prior art, the present invention proposes a linkage-controlled gas-liquid two-phase nozzle, which can realize synchronous linkage control of the gas circuit and the liquid circuit through an electromagnetic on-off switch, thereby achieving better synchronous control accuracy and on-off response speed. At the same time, this invention prevents liquid from flowing through the solenoid valve, thereby increasing the service life of the solenoid valve.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0005] In a first aspect, the present invention discloses a linkage-controlled gas-liquid two-phase nozzle, comprising a nozzle body, a pneumatic control cavity, and a gas-liquid mixed flow cavity;

[0006] The nozzle body comprises a liquid inlet, a liquid flow control port, and a liquid outlet flow channel; the liquid inlet and the liquid outlet flow channel are coaxially arranged vertically, and a liquid flow control port is arranged between the liquid inlet and the liquid outlet flow channel; a pneumatic control cavity is installed at the liquid flow control port; and a gas-liquid mixed flow cavity is installed on the liquid outlet flow channel;

[0007] The pneumatic control cavity comprises an air inlet pipe I, an air outlet pipe, a connecting cap, a pressure relief hole, a pressure stabilizing buffer cavity, a main air flow channel, a branch air flow channel, and a pressure cavity; the air inlet pipe I, the main air flow channel, and the air outlet pipe are connected, and a pressure stabilizing buffer cavity is arranged between the air inlet pipe and the main air flow channel and between the air outlet pipe and the main air flow channel; the main air flow channel is connected with the branch air flow channel, the branch air flow channel is connected with the pressure cavity, the pressure cavity and the branch air flow channel are arranged on the connecting cap, and a pressure relief hole is also arranged on the connecting cap, and the pressure relief hole is connected with the pressure cavity; the connecting cap is connected with the outer ring of the liquid flow control port, and a control plug and a guide sealing frame are installed in the pressure cavity, the guide sealing frame is fixed on the end face of the liquid flow control port, and a spring is arranged between the guide sealing frame and the control plug, and the control plug can move toward the liquid flow control port along the inner ring of the guide sealing frame under the action of gas pressure to seal the liquid flow control port, and at the same time, the control plug can be reset under the action of the spring;

[0008] The gas-liquid mixed flow cavity comprises a liquid flow cavity and an air inlet pipe II, the liquid flow cavity is communicated with a liquid outlet channel, the air inlet pipe II is connected with an air outlet pipe, and an electromagnetic on-off valve is arranged on the pipeline connecting the air inlet pipe II and the air outlet pipe.

[0009] As a further technical solution, the liquid flow control port is an annular control port, including an outer ring flow channel and an inner ring flow channel. The outer ring flow channel is connected to the liquid inlet, and the inner ring flow channel is connected to the liquid outlet. Whether the outer ring flow channel and the inner ring flow channel are connected is controlled by a control plug.

[0010] As a further technical solution, the control plug includes a guide rod and a rubber pad; the guide rod is T-shaped, with one end being a large area end and the other end being a small area end, wherein the small area end is clamped with a rubber pad and the large area end cooperates with the pressure chamber.

[0011] As a further technical solution, one end of the spring is press-fitted on the large-area end, and the other end is mounted on the guide seal frame.

[0012] As a further technical solution, the gas-liquid mixed flow cavity is connected to the liquid outlet channel via a snap-on connector.

[0013] As a further technical solution, a nozzle is installed in the liquid flow cavity.

[0014] As a further technical solution, a filter is installed in the liquid outlet channel.

[0015] As a further technical solution, the inner diameter of the inlet pipe is equal to the inner diameter of the outlet pipe, and the inner diameter of the pressure stabilizing buffer chamber is larger than the inner diameters of the inlet and outlet pipes; and the inner diameter of the main air flow channel is much smaller than the inner diameters of the inlet and outlet pipes, and the diameter of the main air flow channel is equal to the diameter of the branch air flow channel; the inner diameter of the pressure chamber is much larger than the inner diameter of the branch air flow channel.

[0016] In the second aspect, the present invention further provides a linkage control method based on the linkage control type gas-liquid two-phase nozzle, which is specifically as follows:

[0017] The liquid inlet on the nozzle body is connected to the main liquid pipeline, the air inlet pipe on the pneumatic control cavity is connected to the air pressure pipeline, the air outlet pipe on the pneumatic control cavity is connected to the air inlet pipe on the gas-liquid mixed flow cavity, and an electromagnetic on-off valve is designed and installed between them;

[0018] The pressurized liquid and gas enter from the liquid inlet on the nozzle body and the air inlet pipe on the pneumatic control cavity respectively;

[0019] When the electromagnetic on-off valve is in the open state, the gas coming from the air inlet pipe I directly enters the air inlet pipe II through the air outlet pipe and mixes with the liquid, so that the air pressure value of the pressure chamber in the pneumatic control chamber is reduced. At this time, the control plug is in the reset state under the action of the spring thrust, and the rubber pad on the control plug and the liquid flow control port on the nozzle body are in a non-closed state. At this time, both the air path and the liquid path are passages, and the nozzle is in a spraying state;

[0020] When the electromagnetic on-off valve is disconnected, the air pressure in the pneumatic control chamber increases. The air pressure in the pressure chamber will overcome the thrust of the spring to push the control plug to move. The rubber pad on the control plug and the liquid flow control port on the nozzle body will be in a closed state. At this time, both the air circuit and the liquid circuit are disconnected, and the nozzle is in a closed state.

[0021] As a further technical solution, the nozzle spray volume is changed by controlling the on-off time ratio and on-off frequency of the high-frequency solenoid valve.

[0022] In a third aspect, the present invention further discloses a spraying device, comprising the linkage-controlled gas-liquid two-phase nozzle.

[0023] The beneficial effects of the present invention are as follows:

[0024] 1. The present invention connects the air outlet pipe of the pneumatic control cavity and the air inlet pipe II of the gas-liquid mixed flow cavity, so that the high-pressure gas coming in from the pneumatic control cavity can be mixed with the incoming liquid to achieve gas-liquid mixing, and on the other hand, due to the flow of liquid, the air pressure value of the pressure chamber in the pneumatic control cavity can be further reduced, thereby forming a non-closed state between the rubber pad on the control plug and the liquid flow control port on the nozzle body, that is, the switch of the nozzle body and the mixing of gas and liquid can be controlled simultaneously through one gas and one electromagnetic on-off valve, killing two birds with one stone, and can achieve better synchronous control accuracy and on-off response speed. At the same time, this invention avoids liquid flowing through the solenoid valve, which can increase the service life of the solenoid valve.

[0025] 2. The liquid flow control port in the present invention is an annular control port, and the axis of the annular control port is perpendicular to the axes of the liquid inlet and the liquid outlet; the liquid flow control port includes an outer ring channel and an inner ring channel, the outer ring channel is connected to the liquid inlet, and the inner ring channel is connected to the liquid outlet, and the connectivity between the outer ring channel and the inner ring channel is jointly controlled by the pneumatic control cavity and the control plug; at the same time, the present invention can also achieve changes in the nozzle spray volume by controlling the on-off time ratio and on-off frequency of the solenoid valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0027] Figure 1 is a side plan view of an embodiment of the present invention;

[0028] Figure 2 It is a front view of an embodiment of the present invention;

[0029] Figure 3 is a main cross-sectional view of an embodiment of the present invention;

[0030] Figure 4 is a top sectional view of an embodiment of the present invention;

[0031] Figure 5 A side plan view of a nozzle body according to an embodiment of the present invention;

[0032] Figure 6 A main cross-sectional view of a nozzle body according to an embodiment of the present invention;

[0033] Figure 7 It is a structural schematic diagram of a pneumatic control cavity according to an embodiment of the present invention;

[0034] Figure 8 is a cross-sectional view of a pneumatic control cavity according to an embodiment of the present invention;

[0035] Fig. 9 A schematic structural diagram of a guide sealing frame according to an embodiment of the present invention;

[0036] Fig.10 is a cross-sectional view of a guide sealing frame according to an embodiment of the present invention;

[0037] Fig.11 This is a schematic diagram of the structure of a control plug according to an embodiment of the present invention;

[0038] Fig.12 is a cross-sectional view of a control plug according to an embodiment of the present invention;

[0039] Fig.13 It is a structural schematic diagram of a gas-liquid mixed flow cavity;

[0040] In the figure: the distances or sizes between parts are exaggerated to show the positions of various parts, and the schematic diagram is for illustration only.

[0041] 1: Nozzle body; 2: Pneumatic control cavity; 3: Gas-liquid mixed flow cavity; 4: Nozzle cap; 5: Nozzle; 6: Sealing ring; 7: Sealing ring; 8: Spring; 9: Guide sealing frame; 10: Control plug; 11: Filter; 12: Sealing pad; 13: Sealing pad.

[0042] 1-1: liquid inlet; 1-2: liquid flow control port; 1-3: liquid outlet channel; 1-4: threaded connector; 1-5: snap-on connector.

[0043] 2-1: air inlet pipe I; 2-2: air outlet pipe; 2-3: connecting cap; 2-4: pressure relief hole; 2-5: pressure stabilizing buffer chamber; 2-6: main air flow channel; 2-7: branch air flow channel; 2-8: pressure chamber; 2-9: annular groove.

[0044] 3-1: air inlet pipe II, 3-2: liquid flow chamber;

[0045] 9-1: guide hole; 9-2: annular groove; 9-3: shaft shoulder.

[0046] 10-1: guide rod; 10-2: rubber pad. DETAILED DESCRIPTION

[0047] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0048] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless otherwise explicitly stated in the present invention, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof;

[0049] For the convenience of description, if the words "up", "down", "left" and "right" appear in the present invention, they only indicate that they are consistent with the up, down, left and right directions of the drawings themselves, and do not limit the structure. They are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0050] like Figure 1-Figure 4As shown, this embodiment discloses a linkage control type gas-liquid two-phase nozzle and a spraying device, wherein the nozzle comprises a nozzle body 1, a pneumatic control cavity 2, a gas-liquid mixed flow cavity 3, a nozzle cap 4, a nozzle 5, a sealing ring 6, a sealing ring 7, a spring 8, a guide sealing frame 9, a control plug 10, a filter screen 11, a sealing gasket 12, and a sealing gasket 13;

[0051] The structure of the nozzle body 1 includes a liquid inlet 1-1, a liquid flow control port 1-2, and a liquid outlet channel 1-3; the liquid inlet 1-1 and the liquid outlet channel 1-3 are coaxially arranged up and down, and the liquid flow control port 1-2 is arranged between the liquid inlet 1-1 and the liquid outlet channel 1-3; the liquid flow control port 1-2 is installed with a pneumatic control cavity 2; a gas-liquid mixed flow cavity 3 is installed on the liquid outlet channel 1-3; and the air outlet pipe 2-2 on the pneumatic control cavity 2 is connected with the air inlet pipe II 3-1 on the gas-liquid mixed flow cavity 3, and an electromagnetic on-off valve is arranged on the connected pipeline; and the gas-liquid mixed flow cavity 3 is connected to the nozzle cap 4, and a nozzle 5 is installed in the nozzle cap 4; the present invention connects the air outlet pipe 2-2 of the pneumatic control cavity and the air inlet pipe II 3-1 of the gas-liquid mixed flow cavity 3-1 is connected, so that the high-pressure gas coming in from the pneumatic control cavity can, on the one hand, be mixed with the incoming liquid to achieve gas-liquid mixing, and on the other hand, due to the flow of liquid, the air pressure value of the pressure chamber in the pneumatic control cavity can be further reduced, thereby completing the formation of a non-closed state between the rubber pad on the control plug and the liquid flow control port on the nozzle body, that is, the switch of the nozzle body and the mixing of gas and liquid can be controlled simultaneously through one path of gas, killing two birds with one stone, and can achieve better synchronous control accuracy and on-off response speed. At the same time, this invention prevents liquid from flowing through the solenoid valve, which can increase the service life of the solenoid valve.

[0052] like Figure 5 , Figure 6 As shown, the structure of the nozzle body 1 includes a liquid inlet 1-1, a liquid flow control port 1-2, a liquid flow channel 1-3, a threaded connector 1-4, and a snap-on connector 1-5;

[0053] The liquid inlet 1-1 and the liquid outlet channel 1-3 are coaxially arranged vertically, and a liquid flow control port 1-2 is arranged between the liquid inlet 1-1 and the liquid outlet channel 1-3. The outer ring of the liquid flow control port 1-2 is a threaded connector 1-4; the outer ring of the liquid outlet channel 3 is a snap-on connector 1-5;

[0054] The threaded connector 1-4 is connected to the pneumatic control chamber 2, and the snap-on connector 1-5 is connected to the nozzle cap 3;

[0055] The liquid flow control port 1-2 is an annular control port, and the axis of the annular control port is perpendicular to the axes of the liquid inlet 1-1 and the liquid outlet channel 1-3; the liquid flow control port 1-2 includes an outer ring channel and an inner ring channel, the outer ring channel is connected to the liquid inlet 1-1, and the inner ring channel is connected to the liquid outlet channel 1-3, and the connection between the outer ring channel and the inner ring channel is jointly controlled by the pneumatic control cavity 2 and the control plug 10; when the control plug 10 moves toward the liquid flow control port 1-2 under the action of gas pressure, when the control plug 10 completely seals the liquid flow control port 1-2, the liquid inlet 1-1 is completely disconnected from the liquid outlet channel 1-3.

[0056] like Figure 7 , Figure 8 As shown, the structure of the pneumatic control cavity 2 includes an air inlet pipe 2-1, an air outlet pipe 2-2, a connecting cap 2-3, a pressure relief hole 2-4, a pressure stabilizing buffer cavity 2-5, a main air channel 2-6, a branch air channel 2-7, a pressure cavity 2-8, and an annular groove 2-9;

[0057] The air inlet pipe 12-1 is connected to the pressure-stabilizing buffer chamber 2-5, the pressure-stabilizing buffer chamber 2-5 is connected to one end of the main air channel 2-6, the other end of the main air channel 2-6 is another pressure-stabilizing buffer chamber, and the pressure-stabilizing buffer chamber is connected to the air outlet pipe 2-2; the main air channel 2-6 is connected to the branch air channel 2-7, the branch air channel 2-7 is connected to the pressure chamber 2-8, the pressure chamber 2-8 and the branch air channel 2-7 are arranged in the connecting cap 2-3, and the connecting cap 2-3 is also provided with a pressure relief hole 2-4, and the pressure relief hole 2-4 is connected to the pressure chamber 2-8;

[0058] The air inlet pipe 2-1, the pressure stabilizing buffer chamber 2-5, the main air channel 2-6 and the air outlet pipe 2-2 are coaxially arranged; the branch air channel 2-7 is perpendicular to the axis of the main air channel 2-6;

[0059] A control plug 10, a guide sealing frame 9 and a spring 7 are installed in the pressure chamber 2-8. One end of the control plug 10 is installed in the guide sealing frame 9, and the other end is located outside the guide sealing frame 9 and cooperates with the inner wall of the pressure chamber 2-8. The upper end surface of the control plug 10 and the pressure chamber 2-8 form a relatively sealed pressure chamber space; the spring 7 is pressed between the guide sealing frame 9 and the control plug 10, mainly to realize the resetting of the control plug 10.

[0060] Further, such as Figure 8As shown, the inner diameter of the above-mentioned air inlet pipe I 2-1 is equal to the inner diameter of the air outlet pipe 2-2, and the inner diameter of the pressure stabilizing buffer chamber 2-4 is larger than the inner diameters of the air inlet pipe I 2-1 and the air outlet pipe 2-2; and the inner diameter of the main air flow channel 2-6 is much smaller than the inner diameters of the air inlet pipe I 2-1 and the air outlet pipe 2-2, so that the air flow can instantly form a high pressure at the position of the main air flow channel 2-6, and at the same time, the diameter of the main air flow channel 2-6 is equal to the diameter of the branch air flow channel 2-7, so that when the main air flow channel 2-6 forms a high pressure, a negative pressure can be formed at the position of the branch air flow channel 2-6, and in order to better drive the control plug 10, the inner diameter of the pressure chamber 2-8 is much larger than the inner diameter of the branch air flow channel 2-7.

[0061] like Fig. 9 , Fig.10 As shown, the guide seal frame 9 includes a body, on which a guide hole 9-1, an annular groove 9-2, and a shaft shoulder 9-3 are provided;

[0062] The body is a cylindrical sleeve, the center of which is a guide hole 9-1, one end of which is provided with a shaft shoulder 9-3, the inner ring of the guide hole 9-1 cooperates with the control plug 10, and two circles of annular grooves 9-2 are provided on the inner ring of the guide hole 9-1, and the two circles of annular grooves 9-2 are used to install the sealing ring 7; the sealing ring 6 is installed at the position of the shaft shoulder 9-3;

[0063] like Fig.11 , Fig.12 As shown, the control plug 10 includes a guide rod 10-1 and a rubber pad 10-2; the guide rod 10-1 is T-shaped, including a large-area end and a small-area end, wherein the small-area end is clamped with a rubber pad, and the large-area end cooperates with the pressure chamber. Specifically, a blind hole is arranged at the center of the guide rod 10-1, and a groove is arranged on the inner wall of the blind hole. A circle of bosses is arranged on the rubber pad 10-2, and the bosses are clamped in the grooves of the guide rod 10-1 to realize the connection between the rubber pad 10-2 and the guide rod 10-1.

[0064] One end of the spring 7 is pressed onto the large-area end, and the other end is mounted on the guide seal frame 9 .

[0065] like Figure 1 , Figure 5 , Figure 7 As shown, the pneumatic control chamber 2 is fixedly mounted on the threaded connector 1-4 on the nozzle body 1 through the connecting cap 2-3 thereon.

[0066] like Figure 1 , Figure 5As shown, the gas-liquid mixed flow cavity 3 is fixedly mounted on the snap-on connector 1-5 on the nozzle body 1; the nozzle cap 4 is fixedly mounted on the lower end of the gas-liquid mixed flow cavity 3, and the gas-liquid mixed flow cavity 3 includes an air inlet pipe II 3-1 and a liquid flow cavity 3-2, the air inlet pipe II 3-1 is connected to the liquid flow cavity 3-2, the liquid flow cavity 3-2 is connected to the liquid outlet channel, the air inlet pipe II 3-1 is connected to the front air outlet pipe 2-2, and the air inlet pipe II 3-1 is connected to the front air outlet pipe 2-2. An electromagnetic on-off valve is arranged on the pipeline connected to the air outlet pipe 2-2 via 3-1; when the electromagnetic on-off valve is in the open state, the high-pressure gas coming in from the air inlet pipe I directly enters the air inlet pipe II via the air outlet pipe, and mixes with the liquid coming in from the liquid flow chamber 3-2 to achieve gas-liquid mixing, and at the same time, the air pressure value of the pressure chamber in the pneumatic control chamber is reduced. At this time, both the air circuit and the liquid circuit are passages, and the nozzle is in the spraying state; when the electromagnetic on-off valve is in the disconnected state, the gas coming in from the air inlet pipe I cannot enter the air inlet pipe II via the air outlet pipe, and therefore, the air pressure value of the pressure chamber 2-8 in the pneumatic control chamber is increased. At this time, both the air circuit and the liquid circuit are disconnected, and the nozzle is in the closed state, that is, when the nozzle is closed, the gas-liquid mixing chamber also stops working, and the opening and closing control of the nozzle and the gas-liquid mixing control can be realized simultaneously through an electromagnetic on-off valve; better synchronous control accuracy and on-off response speed can be achieved, and at the same time, during the entire control process of this invention, the liquid does not flow through the electromagnetic valve, which can increase the service life of the electromagnetic valve.

[0067] like Figure 3 , Figure 4 , Figure 8 As shown, the pneumatic control cavity 2 is designed to be installed with a sealing ring 6, a sealing ring 7, a spring 8, a guide sealing frame 9, and a control plug 10;

[0068] The guide sealing frame 9 is installed in cooperation with the annular groove 2-9 of the pneumatic control chamber 2; the sealing ring 6 is installed on the axial shoulder 9-3 of the guide sealing frame 9, which can realize the fixed connection seal between the pneumatic control chamber 2 and the nozzle body 1; the control plug 10 is slidably installed in the pressure chamber 2-8 of the pneumatic control chamber 2, and the upper end surface of the control plug 10 and the pressure chamber 2-8 form a relatively sealed pressure chamber space; the guide rod 10-1 of the control plug 10 is slidably installed with the guide hole 9-1 of the guide sealing frame 9; the multiple sealing rings 7 are installed in the annular groove 9-2 of the guide sealing frame 9, which can realize the sliding connection seal between the control plug 10 and the guide sealing frame 9; a spring 8 is compressed and installed between the control plug 10 and the guide sealing frame 9, which can push the control plug 10 to achieve a quick reset response.

[0069] Furthermore, a filter screen 11 is designed and installed in the liquid outlet flow channel 1-3 of the nozzle body 1; a sealing gasket 12 is designed and installed at the fixed connection between the gas-liquid mixed flow cavity 3 and the nozzle body 1 to achieve the sealing of the flow channel. A nozzle 5 is installed between the lower end of the gas-liquid mixed flow cavity 3 and the nozzle cap 4; a sealing gasket 13 is designed and installed between the lower end of the gas-liquid mixed flow cavity 3 and the nozzle 5 to achieve the sealing of the flow channel.

[0070] The working principle and usage of the above device are as follows:

[0071] When the nozzle is actually used, the liquid inlet 1-1 on the nozzle body 1 is connected to the main liquid pipeline, the air inlet pipe I 2-1 on the pneumatic control cavity 2 is connected to the air pressure pipeline, the air outlet pipe 2-2 on the pneumatic control cavity 2 is connected to the air inlet pipe II 3-1 on the gas-liquid mixed flow cavity 3, and an electromagnetic on-off valve is designed and installed between them;

[0072] The pressurized liquid and gas enter from the liquid inlet 1-1 on the nozzle body 1 and the air inlet pipe 2-1 on the pneumatic control chamber 2 respectively;

[0073] When the electromagnetic on-off valve is in the open state, the high-pressure gas coming from the air inlet pipe I directly enters the air inlet pipe II through the air outlet pipe, and mixes with the liquid coming from the liquid flow chamber 3-2 to achieve gas-liquid mixing. At the same time, the air pressure value of the pressure chamber in the pneumatic control chamber is reduced. Under the thrust of the spring 8, the control plug 10 is in a reset state, and the rubber pad 10-2 on the control plug 10 and the liquid flow control port 1-2 on the nozzle body 1 are in a non-closed state. At this time, both the air path and the liquid path are passages, and the nozzle is in a spraying state;

[0074] When the electromagnetic on-off valve is in the disconnected state, the gas coming in from the air inlet pipe I cannot enter the air inlet pipe II through the air outlet pipe. Therefore, the air pressure value of the pressure chamber 2-8 in the pneumatic control chamber increases, and the air pressure in the pressure chamber 2-8 will overcome the thrust of the spring 8 to push the control plug 10 to move. The rubber pad 10-2 on the control plug 10 and the liquid flow control port 1-2 on the nozzle body 1 will be in a closed state. At this time, both the air circuit and the liquid circuit are disconnected, and the nozzle is in a closed state, that is, when the nozzle is closed, the gas-liquid mixing chamber also stops working. The opening and closing control of the nozzle and the gas-liquid mixing control can be realized simultaneously through an electromagnetic on-off valve; better synchronous control accuracy and on-off response speed can be achieved. At the same time, during the entire control process of this invention, the liquid does not flow through the solenoid valve, which can increase the service life of the solenoid valve.

[0075] This embodiment also discloses a spraying device, which includes the linkage-controlled gas-liquid two-phase nozzle described above. Since the spraying device is provided with the linkage-controlled gas-liquid two-phase nozzle described above, the spraying device also has all the advantages described above.

[0076] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A linkage controlled gas-liquid two-phase nozzle, characterized in that: It includes a nozzle body, a pneumatic control cavity, and a gas-liquid mixed flow cavity; The nozzle body comprises a liquid inlet, a liquid flow control port, and a liquid outlet flow channel; the liquid inlet and the liquid outlet flow channel are coaxially arranged vertically, and a liquid flow control port is arranged between the liquid inlet and the liquid outlet flow channel; a pneumatic control cavity is installed at the liquid flow control port, and a gas-liquid mixed flow cavity is installed on the liquid outlet flow channel; The pneumatic control cavity comprises an air inlet pipe I, an air outlet pipe, a connecting cap, a pressure relief hole, a pressure stabilizing buffer cavity, a main air flow channel, a branch air flow channel, and a pressure cavity; the air inlet pipe I, the main air flow channel, and the air outlet pipe are connected, and a pressure stabilizing buffer cavity is arranged between the air inlet pipe and the main air flow channel and between the air outlet pipe and the main air flow channel; the main air flow channel is connected with the branch air flow channel, the branch air flow channel is connected with the pressure cavity, the pressure cavity and the branch air flow channel are arranged on the connecting cap, and a pressure relief hole is also arranged on the connecting cap, and the pressure relief hole is connected with the pressure cavity; the connecting cap is connected with the outer ring of the liquid flow control port, and a control plug and a guide sealing frame are installed in the pressure cavity, the guide sealing frame is fixed on the end face of the liquid flow control port, and a spring is arranged between the guide sealing frame and the control plug, and the control plug can move toward the liquid flow control port along the inner ring of the guide sealing frame under the action of gas pressure to seal the liquid flow control port, and at the same time, the control plug can be reset under the action of the spring; The gas-liquid mixed flow cavity comprises a liquid flow cavity and an air inlet pipe II, the liquid flow cavity is connected to the liquid outlet flow channel, the air inlet pipe II is connected to the air outlet pipe, and an electromagnetic on-off valve is arranged on the pipeline connecting the air inlet pipe II and the air outlet pipe, and the switch of the nozzle body and the mixing of gas and liquid can be controlled simultaneously through one gas and one electromagnetic on-off valve; The liquid flow control port is an annular control port, including an outer ring flow channel and an inner ring flow channel. The outer ring flow channel is connected to the liquid inlet, and the inner ring flow channel is connected to the liquid outlet flow channel. Whether the outer ring flow channel and the inner ring flow channel are connected is controlled by a control plug; the axis of the annular control port is perpendicular to the axis of the liquid inlet and the liquid outlet flow channel.

2. The linkage-controlled gas-liquid two-phase nozzle according to claim 1, characterized in that: The control plug comprises a guide rod and a rubber pad; the guide rod is T-shaped, with one end being a large-area end and the other end being a small-area end, wherein the small-area end is clamped with a rubber pad and the large-area end cooperates with the pressure chamber.

3. The linkage controlled gas-liquid two-phase nozzle according to claim 2, characterized in that: One end of the spring is pressed onto the large-area end, and the other end is mounted on the guide seal frame.

4. The linkage controlled gas-liquid two-phase nozzle according to claim 1, characterized in that: The gas-liquid mixed flow cavity is connected to the liquid outlet channel via a snap-on connector.

5. The linkage-controlled gas-liquid two-phase nozzle according to claim 1, characterized in that: The inner diameter of the air inlet pipe is equal to the inner diameter of the air outlet pipe, and the inner diameter of the pressure stabilizing buffer chamber is larger than the inner diameters of the air inlet and outlet pipes; and the inner diameter of the main air flow channel is much smaller than the inner diameters of the air inlet and outlet pipes, and the diameter of the main air flow channel is equal to the diameter of the branch air flow channel; the inner diameter of the pressure chamber is much larger than the inner diameter of the branch air flow channel.

6. The linkage-controlled gas-liquid two-phase nozzle according to claim 1, characterized in that: A nozzle is installed in the liquid flow cavity; a filter is installed in the liquid outlet channel.

7. The linkage control method of the linkage control type gas-liquid two-phase nozzle according to any one of claims 1 to 6, characterized in that: The liquid inlet on the nozzle body is connected to the main liquid pipeline, the air inlet pipe on the pneumatic control cavity is connected to the air pressure pipeline, the air outlet pipe on the pneumatic control cavity is connected to the air inlet pipe on the gas-liquid mixed flow cavity, and an electromagnetic on-off valve is designed and installed between them; The pressurized liquid and gas enter from the liquid inlet on the nozzle body and the air inlet pipe on the pneumatic control cavity respectively; When the electromagnetic on-off valve is in the open state, the gas coming from the air inlet pipe I directly enters the air inlet pipe II through the air outlet pipe and mixes with the liquid, so that the air pressure value of the pressure chamber in the pneumatic control chamber is reduced. At this time, the control plug is in the reset state under the action of the spring thrust, and the rubber pad on the control plug and the liquid flow control port on the nozzle body are in a non-closed state. At this time, both the air path and the liquid path are passages, and the nozzle is in a spraying state; When the electromagnetic on-off valve is disconnected, the air pressure in the pneumatic control chamber increases. The air pressure in the pressure chamber will overcome the thrust of the spring to push the control plug to move. The rubber pad on the control plug and the liquid flow control port on the nozzle body will be in a closed state. At this time, both the air circuit and the liquid circuit are disconnected, and the nozzle is in a closed state.

8. The control method of the linkage control type gas-liquid two-phase nozzle according to claim 7, characterized in that: The nozzle spray volume is changed by controlling the on-off time ratio and on-off frequency of the high-frequency solenoid valve.

9. A spraying device, characterized in that: It comprises the linkage-controlled gas-liquid two-phase nozzle as described in any one of claims 1-6.

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