A spray gun

Abstract

The application relates to the field of electric tools, and particularly discloses a spray gun which comprises a spray gun shell, a nozzle arranged at one end of the spray gun shell, an atomizing air cap sleeved outside the nozzle, a needle column assembly movably arranged in the spray gun shell, the spray gun shell being adapted to be connected with a liquid container, the spray gun shell being provided with a second mounting portion, a liquid flow guide pipe being adapted to be inserted into the second mounting portion, the liquid flow guide pipe comprising a first pipe section and a second pipe section, the first pipe section extending into the inner cavity of the liquid container, the second pipe section extending into the second mounting portion and being operable to drive the first pipe section to rotate in the liquid container, so that a dynamic adsorption area is formed, and the liquid can be effectively adsorbed regardless of the liquid level or the position (center or edge) of the liquid at the bottom of the container. This greatly reduces the liquid residue and the waste of high-viscosity or high-value liquid.

Description

Technical Field

[0001] This application relates to the field of power tools, and in particular to a spray gun. Background Technology

[0002] As a tool widely used in spraying, humidification, cleaning and other fields, the core function of a spray gun is to atomize and spray liquids (such as paint, coatings, cleaning agents, etc.). A traditional spray gun typically includes a spray gun housing, a nozzle, a needle column assembly for controlling the liquid flow, and a liquid container connected to the spray gun housing.

[0003] In existing technology, liquid containers are typically fixed to the bottom or side of the spray gun housing via threaded connections. This connection method has the following significant drawbacks:

[0004] Inconvenient liquid addition: When it is necessary to add liquid to the container or change the type of liquid, the entire container must be unscrewed. This process is not only cumbersome and time-consuming, increasing the user's workload, but also prone to wear and contamination of threaded connections during frequent disassembly, affecting subsequent sealing performance and potentially leading to leakage.

[0005] Fixed pipe angle leads to liquid residue: Liquid containers typically have a fixed guide tube (suction tube) inside, one end extending to the bottom of the container and the other end connecting to the liquid channel of the spray gun housing. The angle and position of this guide tube are fixed after installation and cannot be adjusted. Since the end of the guide tube is usually located near the center bottom of the container, when the liquid level in the container drops, especially near the bottom, the liquid located at the bottom edge of the container (especially in corners or recessed areas) is difficult to be effectively sucked away due to its distance from the suction port and the shape of the container bottom. This results in a significant portion of valuable liquid (especially high-viscosity or high-cost liquids) remaining unused, causing waste.

[0006] To reduce residue, users need to disassemble the container more frequently to add liquid or tilt and shake it to try to direct the liquid towards the suction nozzle, which further increases the operational burden and has limited effectiveness. When the suction nozzle cannot pick up liquid at the edges, the spray gun may draw in air, causing unstable, intermittent, or even interrupted spraying, affecting the continuity of the spraying operation and the final spray quality.

[0007] Therefore, the existing spray guns have shortcomings in the liquid container connection method and the design of the built-in guide tube, mainly in the two major problems of cumbersome liquid addition operation and inability to effectively adsorb residual liquid at the bottom edge of the container. Utility Model Content

[0008] The purpose of at least one specific embodiment of this utility model is to overcome the defects of the existing technology and provide a spray gun.

[0009] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0010] A spray gun, comprising:

[0011] The spray gun housing has a first mounting part, the inner cavity of which is configured as a liquid guiding cavity;

[0012] The nozzle is located at one end of the spray gun housing and is connected to the liquid guide chamber;

[0013] The needle column assembly moves within the cavity of the first mounting portion to control the opening or closing of the nozzle and the liquid guide cavity;

[0014] The spray gun housing is suitable for connecting to a liquid container, and the spray gun housing has a second mounting part, the inner cavity of the second mounting part being in communication with the inner cavity of the first mounting part;

[0015] The second mounting part is suitable for inserting a liquid guide tube, which includes a first tube section and a second tube section. The first tube section extends into the inner cavity of the liquid container, and the second tube section extends into the second mounting part. It can be operated to drive the first tube section to rotate inside the liquid container to form a dynamic adsorption area.

[0016] The second pipe section is connected to the inner cavity of the second mounting part. Under the action of air pressure, the liquid in the liquid container is absorbed by the first pipe section and flows into the inner cavity of the second mounting part and the first mounting part.

[0017] Furthermore, one end of the second pipe section is connected to a flared injection port, which is located outside the second mounting part and is configured as an operating part to drive the first and second pipe sections to rotate.

[0018] Furthermore, the second pipe section has an upper sealing part and a lower sealing part, which are circumferentially supported on the inner wall of the second mounting part to form a liquid transition cavity. The second pipe section is provided with a first through hole, and the connection position of the first mounting part and the second mounting part is provided with a second through hole. The first through hole keeps the second pipe section connected to the liquid transition cavity, and the second through hole keeps the liquid transition cavity connected to the liquid guide cavity.

[0019] Furthermore, a sealing cap is connected to the flared injection section.

[0020] Furthermore, the first tube segment is inclined at an angle to the bottom surface of the inner cavity of the liquid container, and the port of the first tube segment faces the bottom edge of the inner cavity of the liquid container. When the first tube segment rotates inside the liquid container, the dynamic adsorption area includes the bottom area of ​​the inner cavity of the liquid container and the bottom edge area of ​​the inner cavity.

[0021] Furthermore, one end of the second pipe section has a threaded section, and the flared injection section is threadedly connected to the second pipe section.

[0022] Furthermore, the spray gun housing has a connecting part, and the liquid container has a connecting head. The liquid container is connected to the connecting part through the connecting head. After the connecting head and the connecting part are connected, they form a sealed cavity, which is connected to the inner cavity of the liquid container.

[0023] Furthermore, the spray gun also includes an atomizing cap, which is installed at one end of the spray gun housing and fitted over the outside of the nozzle;

[0024] The cavity between the first mounting part and the spray gun housing is constructed as a gas guiding cavity. The gas guiding cavity is connected to the gas source. The gas guiding cavity is connected to the sealed cavity through the first gas guiding channel. The gas guiding cavity is connected to the atomizing hole on the atomizing cap through the second gas guiding channel.

[0025] Furthermore, the needle post assembly includes:

[0026] The needle column is installed in the liquid guiding cavity;

[0027] The elastic element has one end connected to the end of the needle column and the other end abutting against the inner wall of the first mounting part;

[0028] A sealing element is fitted over the outside of the needle column, and the circumferential surface of the sealing element contacts the inner wall of the liquid guiding cavity.

[0029] Among them, the end of the needle column away from the elastic element is the sealing end. This sealing end faces the nozzle, and under the elastic force of the elastic element, the sealing end can seal the nozzle.

[0030] Furthermore, a trigger assembly is rotatably connected to the spray gun housing. The trigger assembly includes a trigger and a pin connected to the trigger. The pin passes through the needle post. The spray gun housing is provided with a movable groove that provides space for the pin to move back and forth.

[0031] Compared with the prior art, the beneficial technical effects of this application are as follows: 1. This application, by setting an independent second mounting part for inserting the liquid guide pipe and adding liquid directly into the liquid container through the flared liquid injection part set on the second pipe section, completely solves the problem in the prior art that the container must be frequently disassembled for adding liquid due to the threaded connection, greatly simplifies the operation process, saves time and manpower, and improves the user experience. At the same time, it avoids the risk of thread wear and seal failure caused by repeated disassembly, and extends the service life of the equipment.

[0032] 2. The first segment of the liquid guide tube in this application can be rotated within the liquid container. By rotating the second segment or the flared injection section connected to it, the user can drive the first segment to perform a circumferential sweep across the bottom of the container. This allows the port of the first segment to actively approach and cover the bottom area of ​​the liquid container's inner cavity, especially the bottom edge positions that are difficult to reach with traditional fixed pipettes. The formed "dynamic adsorption zone" ensures effective adsorption regardless of the liquid level or its location at the bottom of the container (center or edge). This greatly reduces liquid residue, especially the waste of high-viscosity or high-value liquids, significantly improves liquid utilization, and reduces usage costs.

[0033] 3. Because the liquid guide tube can effectively draw in liquid from the bottom edge of the container, it avoids the situation where the spray gun draws in air due to insufficient liquid. This ensures the continuity and stability of the liquid supply, thereby guaranteeing the continuous and smooth operation of spraying (such as painting), effectively preventing problems such as spray interruption, unevenness, or the generation of bubbles, and ultimately improving the quality and effect of the spraying operation. Attached Figure Description

[0034] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of the spray gun structure of this application.

[0036] Figure 2 This is a top view of the present application.

[0037] Figure 3 for Figure 2 A schematic diagram of the cross section along line AA.

[0038] Figure 4 for Figure 2 A schematic diagram of the cross section along line BB.

[0039] Figure 5 for Figure 2 A schematic diagram of the cross section along the CC line.

[0040] Figure 6 This is a front view of the present application.

[0041] Figure 7 for Figure 6 A schematic diagram of the cross section along the DD line.

[0042] Figure 8This is an assembly diagram of this application.

[0043] Figure 9 This is a schematic diagram of the explosion of the spray gun in this application.

[0044] Figure 10 This is a schematic diagram of the spray width adjustment structure of this application.

[0045] Figure 11 This is an exploded schematic diagram of the spray width adjustment structure of this application.

[0046] Figure 12 for Figure 4 A partial structural diagram. Detailed Implementation

[0047] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0048] Reference Figures 1 to 5 A spray gun 100 includes a spray gun housing 10, a nozzle 20 disposed at one end of the spray gun housing 10, an atomizing cap 30 installed at one end of the spray gun housing 10 and sleeved on the outside of the nozzle 20, and a needle column assembly 40 movably installed inside the spray gun housing 10.

[0049] The spray gun housing 10 has a first mounting part 101 inside, and the needle column assembly 40 is installed in the inner cavity of the first mounting part 101. The inner cavity of the first mounting part 101 is constructed as a liquid guiding cavity 200, and the cavity between the first mounting part 101 and the spray gun housing 10 is constructed as a gas guiding cavity 300. The gas guiding cavity 300 is connected to an external gas source.

[0050] In addition, the spray gun housing 10 has a connecting part 102, at which a liquid container 400 is quickly connected. Specifically, the liquid container 400 has a connector 401, and the liquid container 400 is threadedly connected to the connecting part 102 through the connector 401. After the connector 401 and the connecting part 102 are connected, a sealed cavity 500 is formed. In addition, the bottom of the sealed cavity 500 has a partition 501, and the partition 501 has an opening 502, which keeps the sealed cavity 500 connected to the inner cavity of the liquid container 400.

[0051] Furthermore, the gas guiding cavity 300 is connected to the sealed cavity 500 through the first gas guiding channel 301, and the gas guiding cavity 300 is connected to the atomizing hole 30a on the atomizing cap 30 through the second gas guiding channel 302.

[0052] Moreover, refer to Figures 3 to 5 , Figure 8 The spray gun housing 10 has a separately provided second mounting part 103, the inner cavity of the second mounting part 103 is connected to the inner cavity of the first mounting part 101; a liquid guide tube 50 can be inserted into the second mounting part 103, the liquid guide tube 50 includes a first tube section 50a and a second tube section 50b. After the liquid guide tube 50 is inserted into the second mounting part 103, its first tube section 50a extends into the inner cavity of the liquid container 400, and the second tube section 50b extends into the second mounting part 103 and can rotate within the second mounting part 103. The second tube section 50b can be operated to drive the first tube section 50a to rotate within the liquid container 400, and the port of the first tube section 50a sweeps within the inner cavity of the liquid container 400 to form a dynamic adsorption area.

[0053] The second pipe section 50b communicates with the inner cavity of the second mounting part 103. Specifically, the second pipe section 50b has an upper sealing part 50b1 and a lower sealing part 50b2. The upper sealing part 50b1 and the lower sealing part 50b2 are circumferentially supported on the inner wall of the second mounting part 103 to form an annular liquid transition cavity 600. The second pipe section 50b is provided with a first through hole 50c, and a second through hole 104 is provided at the junction of the first mounting part 101 and the second mounting part 103. The first through hole 50c keeps the inner cavity of the second pipe section 50b connected to the inner cavity of the second mounting part 103. The liquid transition chamber 600 is connected, and the second through hole 104 keeps the liquid transition chamber 600 connected to the liquid guide chamber 200. In addition, in order to ensure that the liquid transition chamber 600 has good sealing performance while the second pipe section 50b rotates in the second mounting part 103, a sealing ring can also be fitted on the second pipe section 50b. The sealing rings are on one side of the upper sealing part 50b1 and the lower sealing part 50b2, respectively, to prevent water in the liquid transition chamber 600 from overflowing from the gap between the second pipe section 50b and the inner wall of the second mounting part 103.

[0054] After the gas guide cavity 300 is connected to the gas source, the high-pressure gas supplied by the gas source enters the gas guide cavity 300. Part of the airflow in the gas guide cavity 300 enters the sealed cavity 300 through the first gas guide channel 301, and then enters the inner cavity of the liquid container 400 through the sealed cavity 300. This causes the liquid in the liquid container 400 to be forced into the first section 50a of the liquid guide pipe 50, and then enters the liquid transition cavity 600 along the first section 50a and the second section 50b, and further flows into the liquid guide cavity 200.

[0055] Another part of the airflow in the gas guide cavity 300 enters the atomizing cap 30 through the second gas guide channel 302 and is ejected at high speed from the atomizing hole 30a.

[0056] Furthermore, one end of the second pipe section 50b is connected to a flared injection port 60, through which liquid can be directly added to the liquid container 400. The flared injection port 60 is located outside the second mounting part 103 and is configured as an operating part to drive the first pipe section 50a and the second pipe section 50b to rotate. Since the size of the flared injection port 60 itself is larger than the diameter of the second pipe section 50b, the flared injection port 60 is easy for a person to hold. After holding the flared injection port 60, it can... To drive the entire liquid guide tube 50 to rotate, in this embodiment, the first tube segment 50a is inclined at an angle to the bottom surface of the inner cavity of the liquid container 400, and the port of the first tube segment 50a faces the bottom edge of the inner cavity of the liquid container 400. When the first tube segment 50a rotates inside the liquid container 400, the port of the first tube segment 50a sweeps circumferentially in the inner cavity of the liquid container 400 to form a dynamic adsorption area. The dynamic adsorption area includes the bottom area of ​​the inner cavity of the liquid container 400 and the bottom edge area of ​​the inner cavity.

[0057] In addition, a sealing cap 70 is threadedly connected to the flared injection section 60. The sealing cap 70 protects and seals the flared injection section 60. When no liquid needs to be added to the liquid container 400, the sealing cap 70 is in a closed and sealed state. Moreover, one end of the second pipe section 50b has a threaded section, and the flared injection section 60 is threadedly connected to the second pipe section 50b. This threaded connection facilitates the installation and removal of the flared injection section 60 at the end of the liquid guide pipe 50.

[0058] Furthermore, the needle post assembly 40 includes:

[0059] The needle column 410 is installed in the inner cavity (liquid guide cavity 200) of the first mounting part 101;

[0060] The elastic element 420 has one end connected to the end of the pin 410 and the other end abutting against the inner wall of the first mounting part 101. The elastic element 420 is preferably a spring.

[0061] A sealing element 430 is sleeved on the outside of the needle column 410, and the circumferential surface of the sealing element 410 contacts the inner wall of the liquid guiding cavity 200. The sealing element 430 is preferably a sealing ring.

[0062] Among them, the end of the needle column 410 away from the elastic element 420 is the sealing end 410a. The sealing end 410a faces the nozzle 20. Under the elastic force of the elastic element 420, the sealing end 410a can seal the nozzle 20.

[0063] Furthermore, refer to Figure 6 , Figure 7A trigger assembly 80 is rotatably connected to the spray gun housing 10. The trigger assembly 80 includes a trigger 810 and a pin 820 connected to the trigger 810. The pin 820 passes through the needle post 410. The spray gun housing 10 is provided with a movable groove 10a, which provides space for the pin 820 to move back and forth. One end of the trigger 810 is hinged to the spray gun housing 10.

[0064] When the trigger 810 is not pressed, the needle column assembly 40, under the elastic force of the elastic element 420, blocks the nozzle 20 with the sealing end 410a of the needle column 410, and the liquid in the liquid guide cavity 200 cannot be ejected.

[0065] When the trigger 810 is pressed, the trigger 810 drives the needle column 410 to move against the elastic force of the elastic element 420 through the pin 820, so that the sealing end 410a of the needle column 410 leaves the nozzle 20, and the liquid in the liquid guide chamber 200 is sprayed out from the nozzle 20 under the action of gas pressure. At the same time, the airflow sprayed out by the atomizing cap 30 atomizes the liquid sprayed out by the nozzle 20.

[0066] The working principle of the spray gun 100 is as follows: The high-pressure gas provided by the external gas source first enters the gas guide cavity 300 inside the spray gun housing 10. The airflow entering the gas guide cavity 300 is divided into two paths: the first path of gas (driving / pressurizing gas) flows to the sealed cavity 500 through the first gas guide channel 301.

[0067] The second gas (atomizing gas) flows through the second gas guide channel 302 to the atomizing hole 30a of the atomizing cap 30.

[0068] After the first gas enters the sealed cavity 500, since the sealed cavity 500 is connected to the inner cavity of the liquid container 400 through the opening 502 on the partition 501, the gas pressure will be transmitted to the liquid container 400, applying pressure to the liquid in the container. Driven by the gas pressure, the liquid in the liquid container 400 is forced into the first section 50a of the liquid guide pipe 50 that extends into it, and the liquid flows into the inner cavity of the second section 50b along the first section 50a.

[0069] Liquid flows from the inner cavity of the second pipe section 50b through the first through hole 50c into the liquid transition cavity 600. The liquid transition cavity 600 guides the liquid into the liquid guide cavity 200 (i.e., the inner cavity of the first mounting part 101) through the second through hole 104 at the junction of the second mounting part 103 and the first mounting part 101. When the trigger 810 is not pulled, the elastic force of the elastic element 420 (spring) pushes the needle column 410 towards the nozzle 20. The sealing end 410a at the front end of the needle column 410 tightly abuts against the outlet of the nozzle 20 under the action of the spring force, forming a seal and preventing the liquid in the liquid guide cavity 200 from spraying out.

[0070] When the user pulls the trigger 810, the trigger 810 drives the needle column 410 to move backward against the elastic force of the elastic element 420 via the pin 820. The sealing end 410a of the needle column 410 then leaves the outlet of the nozzle 20, forming a channel. The liquid in the liquid guide chamber 200 under gas pressure (this pressure originates from the gas pressure in the liquid container 400) is ejected at high speed through the opened nozzle 20. At the same time, the second gas (atomizing gas) flowing to the atomizing cap 30 is ejected at high speed from the atomizing hole 30a. This high-speed airflow interacts with the ejected liquid jet near the outlet of the nozzle 20, shearing and breaking the liquid into fine droplets, achieving the atomization effect.

[0071] When the liquid medium in the liquid container 400 is low, the user can rotate the entire liquid guide tube 50 by holding and rotating the flared injection part 60 (which is also the operating part) connected to the end of the second tube section 50b. Since the port of the first tube section 50a faces the bottom edge of the inner cavity of the liquid container 400, when the first tube section 50a rotates, its port sweeps circumferentially across the bottom and bottom edge areas of the inner cavity of the liquid container 400. This rotational sweeping forms a dynamic adsorption zone, allowing the port of the first tube section 50a to actively approach and cover the bottom area of ​​the inner cavity of the liquid container 400, especially the bottom edge positions that are difficult to reach with traditional fixed pipettes. The formed "dynamic adsorption zone" ensures effective adsorption regardless of the liquid level or its location at the bottom of the container (center or edge). This greatly reduces liquid residue, especially the waste of high-viscosity or high-value liquids, significantly improves liquid utilization, and reduces operating costs.

[0072] Furthermore, because the liquid guide tube 50 can effectively absorb the liquid at the bottom edge of the liquid container 400, it avoids the situation where the spray gun draws in air due to insufficient liquid intake. This ensures the continuity and stability of the liquid supply, thereby guaranteeing the continuous and smooth operation of spraying (such as painting), effectively preventing problems such as spray interruption, unevenness, or the generation of bubbles, and ultimately improving the quality and effect of the painting operation.

[0073] When liquid needs to be added to the liquid container 400, the sealing cap 70 can be unscrewed, and the liquid can be poured directly into the liquid container 400 through the flared injection section 60. This completely solves the problem in the prior art where the threaded connection requires frequent disassembly of the container to add liquid, greatly simplifying the operation process, saving time and manpower, and improving the user experience. At the same time, it avoids the risk of thread wear and seal failure caused by repeated disassembly, extending the service life of the equipment. After adding liquid, tighten the sealing cap 70 to ensure the container is airtight.

[0074] Furthermore, refer to Figures 9 to 12In some embodiments, the spray gun housing 10 is equipped with a spray width adjustment structure 700. The spray width adjustment structure 700 specifically includes a width adjustment knob 701 rotatably mounted on one side of the spray gun housing 10, a gear 702 mounted on the end of the width adjustment knob 701, a rotating adjustment seat 703 disposed inside the spray gun housing 10 and sleeved on the outside of the first mounting part 101, and a fixed adjustment seat 704 disposed between the rotating adjustment seat 703 and the atomizing cap 30. The rotating adjustment seat 703 has a toothed part 7031 on one side, the plane of the toothed part 7031 is perpendicular to the plane of the gear 702, and the two are in a meshing state. The rotating adjustment seat 703 has a plurality of first adjustment holes 7032, and the fixed adjustment seat 704 has a plurality of second adjustment holes 7041 corresponding to the first adjustment holes 7032. The atomizing cap 30 has an air outlet chamber 30b on one side, the air outlet chamber 30b corresponds to the second adjustment holes 7041 and communicates with the atomizing hole 30a.

[0075] In addition, the rotating adjustment seat 703 is annular, and its inner wall forms an annular guide port 705 between the outer wall of the first mounting part 101. Moreover, in this embodiment, the fixed adjustment seat 704 is integrally formed with the nozzle 20. The inner wall of the fixed adjustment seat 704, the inner wall of the atomizing wind cap 30, and the outer wall of the nozzle 20 form an annular atomizing guide cavity 706. The atomizing guide cavity 706 is connected to the guide port 705 and surrounds the outer side of the nozzle 20.

[0076] Furthermore, a cover 707 is threadedly connected to the end of the spray gun housing 10. After the cover 707 is threadedly connected to the end of the spray gun housing 10, it can axially limit the atomizing cap 30, the fixed adjustment seat 704, and the rotating adjustment seat 703 after installation, preventing axial displacement among the three. Moreover, in order to limit the rotation angle of the rotating adjustment seat 703 relative to the fixed adjustment seat 704, a rotation limiting groove 7033 is provided on the circumferential surface of the rotating adjustment seat 703, and a limiting rib 101a is provided on the inner wall of the port of the spray gun housing 10. The rotation angle of the rotating adjustment seat 703 relative to the fixed adjustment seat 704 is the arc angle of the rotation limiting groove 7033.

[0077] The spray width adjustment principle of the spray gun 100 will be explained in detail below, taking into account the structure of the spray width adjustment structure 700.

[0078] The high-pressure gas supplied by the external gas source first enters the gas guide cavity 300 inside the spray gun housing 10. The airflow entering the gas guide cavity 300 is divided into two paths: the first path of gas (driving / pressurizing gas) flows to the sealed cavity 500 through the first gas guide channel 301.

[0079] The second gas (atomizing gas): part of it flows through the second gas guide channel 302 (first adjustment hole 7032) to the atomizing hole 30a of the atomizing cap 30, and part of it flows through the guide port 705 and the atomizing guide cavity 706 to the outside of the nozzle 20.

[0080] After the first gas enters the sealed cavity 500, since the sealed cavity 500 is connected to the inner cavity of the liquid container 400 through the opening 502 on the partition 501, the gas pressure will be transmitted to the liquid container 400, applying pressure to the liquid in the container. Driven by the gas pressure, the liquid in the liquid container 400 is forced into the first section 50a of the liquid guide pipe 50 that extends into it, and the liquid flows into the inner cavity of the second section 50b along the first section 50a.

[0081] Liquid flows from the inner cavity of the second pipe section 50b through the first through hole 50c into the liquid transition cavity 600. The liquid transition cavity 600 guides the liquid into the liquid guide cavity 200 (i.e., the inner cavity of the first mounting part 101) through the second through hole 104 at the junction of the second mounting part 103 and the first mounting part 101. When the trigger 810 is not pulled, the elastic force of the elastic element 420 (spring) pushes the needle column 410 towards the nozzle 20. The sealing end 410a at the front end of the needle column 410 tightly abuts against the outlet of the nozzle 20 under the spring force, forming a seal and preventing the liquid in the liquid guide cavity 200 from spraying out. When the user pulls the trigger 810, the trigger 810 drives the needle column 410 to move backward against the elastic force of the elastic element 420 via the pin 820. The sealing end 410a of the needle column 410 moves backward accordingly. The liquid exiting the nozzle 20 forms a channel. The liquid in the liquid guide chamber 200, under the action of gas pressure (the pressure originates from the gas pressure in the liquid container 400), is ejected at high speed through the opened nozzle 20. The airflow ejected from the atomizing guide chamber 706 surrounds the outside of the nozzle 20 port, which can atomize the liquid ejected from the nozzle 20. At the same time, the high-speed airflow ejected from the atomizing hole 30a of the atomizing wind cap 30 shears the atomized liquid, thereby increasing the width of the spray.

[0082] It should be noted that the spray width is directly related to the airflow size emitted from the atomizing hole 30a. When adjusting the airflow size, the operator can rotate the width adjustment knob 701. The width adjustment knob 701 drives the gear 702 to rotate. The gear 702 drives the rotating adjustment seat 703 to rotate through the meshing teeth 7031. When the first adjustment hole 7032 on the rotating adjustment seat 703 coincides with the second adjustment hole 7041 on the fixed adjustment seat 704, the airflow in this path is at its maximum. The airflow in the gas guide cavity 300 flows directly through the first adjustment hole 7032 and the second adjustment hole 7041 to the air outlet cavity 30b and the atomizing hole 30a, thereby maximizing the spray width.

[0083] When the width adjustment knob 701 is rotated further, the first adjustment hole 7032 on the rotating adjustment base 703 and the second adjustment hole 7041 on the fixed adjustment base 704 will partially overlap. At this time, the opening of the overlapping part of the first adjustment hole 7032 and the second adjustment hole 7041 is smaller than both adjustment holes. At this time, the airflow from the atomizing hole 30a will decrease, and the width of the spray will also decrease. When the width adjustment knob 701 is rotated further, until the first adjustment hole 7032 and the second adjustment hole 7041 are misaligned, the atomizing hole... When the airflow from 30a is at its minimum and the spray width is at its lowest, the wall of the rotation limiting groove 7033 on the rotation adjustment seat 703 will also abut against the limiting rib 101a, which can prevent the rotation adjustment seat 703 from rotating further. The cooperation between the rotation limiting groove 7033 and the limiting rib 101a can limit the rotation angle of the rotation adjustment seat 703, ensuring that the first adjustment hole 7032 and the second adjustment hole 7041 can be aligned and staggered smoothly within the rotation range of the rotation adjustment seat 703.

[0084] In summary, the spray width adjustment structure 700 of this application achieves linear control of the atomization width adjustment airflow from 0% to 100% through the continuous change of the overlap between the first adjustment hole 7032 and the second adjustment hole 7041, realizing stepless amplitude adjustment of atomization, and the width can be dynamically adjusted by rotating the knob 701 with a finger.

[0085] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A spray gun, comprising: A spray gun housing having a first mounting portion, the inner cavity of which is configured as a liquid guiding cavity; A nozzle is disposed at one end of the spray gun housing and communicates with the liquid guide chamber; The needle column assembly is movable within the inner cavity of the first mounting portion to control the opening or closing of the nozzle and the liquid guiding cavity; The spray gun housing is characterized in that it is adapted to connect to a liquid container, and the spray gun housing has a second mounting part, the inner cavity of the second mounting part communicating with the inner cavity of the first mounting part; The second mounting portion is adapted to insert a liquid guide tube, which includes a first tube segment and a second tube segment. The first tube segment extends into the inner cavity of the liquid container, and the second tube segment extends into the second mounting portion. It can be operated to drive the first tube segment to rotate within the liquid container to form a dynamic adsorption area. The second pipe section is connected to the inner cavity of the second mounting part. Under the action of air pressure, the liquid in the liquid container is absorbed by the first pipe section and flows into the second mounting part and the inner cavity of the first mounting part.

2. The spray gun according to claim 1, characterized in that, One end of the second pipe section is connected to a flared injection port, which is located outside the second mounting part and is configured as an operating part to drive the first pipe section and the second pipe section to rotate.

3. The spray gun according to claim 1, characterized in that, The second pipe section has an upper sealing part and a lower sealing part, which are circumferentially supported on the inner wall of the second mounting part to form a liquid transition cavity. The second pipe section is provided with a first through hole, and a second through hole is provided at the connection position of the first mounting part and the second mounting part. The first through hole keeps the second pipe section in communication with the liquid transition cavity, and the second through hole keeps the liquid transition cavity in communication with the liquid guide cavity.

4. The spray gun according to claim 2, characterized in that, A sealing cap is connected to the flared injection section.

5. The spray gun according to claim 1, characterized in that, The first tube segment is inclined at an angle to the bottom surface of the inner cavity of the liquid container, and the port of the first tube segment faces the bottom edge of the inner cavity of the liquid container. When the first tube segment rotates inside the liquid container, the dynamic adsorption area includes the bottom area of ​​the inner cavity of the liquid container and the bottom edge area of ​​the inner cavity.

6. The spray gun according to claim 2, characterized in that, One end of the second pipe section has a threaded section, and the flared injection section is threadedly connected to the second pipe section.

7. The spray gun according to claim 1, characterized in that, The spray gun housing has a connecting part, and the liquid container has a connecting head. The liquid container is connected to the connecting part through the connecting head. After the connecting head and the connecting part are connected, they form a sealed cavity, which is in communication with the inner cavity of the liquid container.

8. The spray gun according to claim 7, characterized in that, It also includes an atomizing cap, which is installed at one end of the spray gun housing and sleeved on the outside of the nozzle; The cavity between the first mounting part and the spray gun housing is configured as a gas guiding cavity. The gas guiding cavity is connected to a gas source. The gas guiding cavity is connected to the sealed cavity through a first gas guiding channel. The gas guiding cavity is connected to the atomizing hole on the atomizing cap through a second gas guiding channel.

9. The spray gun according to claim 1, characterized in that, The needle column assembly includes: A needle column, which is installed in the liquid guiding cavity; An elastic element, one end of which is connected to the end of the needle post, and the other end of which abuts against the inner wall of the first mounting part; A sealing element is fitted over the outside of the needle column, and the circumferential surface of the sealing element contacts the inner wall of the liquid guiding cavity; The end of the needle column away from the elastic element is the sealing end, which faces the nozzle. Under the elastic force of the elastic element, the sealing end can seal the nozzle.

10. The spray gun according to claim 9, characterized in that, A trigger assembly is rotatably connected to the spray gun housing. The trigger assembly includes a trigger and a pin connected to the trigger. The pin passes through the needle post. The spray gun housing is provided with a movable groove, which provides space for the pin to move back and forth.

Images