Spray gun

Abstract

A spray gun. A coating storage chamber (13) is provided with a first cavity (11) for storing a coating; an air collection chamber (15) is provided with a second cavity (12) for storing air; a nozzle (3) can be sealingly communicated with the coating storage chamber (13), so that the coating can flow from the first cavity (11) to the nozzle (3); an air inlet channel (17) can be in communication with the air collection chamber (15); and a third cavity (22) is provided inside an air valve stem (2), a first air outlet hole is provided at a distal end of the air valve stem (2), a first air inlet hole (21) is provided at a proximal end of the air valve stem (2), the first air outlet hole of the air valve stem (2) is located inside the first cavity (11) or passes through the first cavity (11), and the proximal end of the air valve stem (2) is movably and sealingly connected to the air collection chamber (15). When the air valve stem moves forward, the first air inlet hole is located outside the second cavity, and when the air valve stem moves backward, the first air inlet hole is located inside the second cavity. A trigger is connected to the air valve stem and can drive the air valve stem to move forward and backward. An air passage and a gun nozzle can be sealed by means of the air valve stem, thereby reducing the sealing requirements and simplifying the structure.

Description

A spray gun TECHNICAL FIELD

[0001] The present application relates to the field of pneumatic tools, in particular to a spray gun. BACKGROUND

[0002] Air spraying is one of the most widely used coating processes, which mainly uses compressed air to spray paint from the nozzle to achieve atomization, and the paint flies in the form of paint mist to the surface of the coated object and adheres to it, finally forming a continuous paint film. The equipment of air spraying process includes spray gun and corresponding paint supply, compressed air supply, coated object conveying, coating operation environment condition control and purification, etc., among which the spray gun is the most important process equipment, and its technical performance has the greatest influence on the coating quality. The spray gun is generally composed of a nozzle, an air rod and a gun body, the nozzle is used to atomize and spray paint to the surface of the coated object; the air rod is a device for adjusting the amount of paint sprayed, the flow of compressed air and the shape of the spray; the gun body is provided with a trigger, a handle, a hopper and other various sealing elements for convenient operation.

[0003] Although the spray gun of the prior art can effectively atomize and spray paint to the surface of the coated object, the existing spray gun has a complex structure, the cooperation relationship of the multiple components inside the gun body is complex, and the machining precision of the components is high. At the same time, in order to ensure that the compressed air does not leak, reliable sealing between multiple devices is required, which puts higher requirements on the sealing between devices.

[0004] Therefore, the skilled in the art is committed to developing a spray gun. SUMMARY

[0005] In view of the above-mentioned defects of the prior art, one of the technical problems to be solved by the present application is that the existing spray gun has a complex structure, high sealing requirements and high manufacturing cost.

[0006] To achieve the above-mentioned purpose, the present application provides a spray gun, comprising:

[0007] a paint storage chamber, the paint storage chamber is arranged at the front of the spray gun, and the paint storage chamber has a first cavity inside for storing paint;

[0008] a plenum, the plenum is arranged at the rear of the spray gun, and the plenum has a second cavity inside for storing gas;

[0009] a nozzle, the nozzle is configured to be in airtight communication with the paint storage chamber, so that paint can flow from the first cavity of the paint storage chamber to the nozzle;

[0010] an air inlet channel configured to be in communication with the air collection chamber; an air rod having a third cavity inside for air flow, the air rod having opposite distal and proximal ends along the air flow direction, the distal end being located at the front of the air rod, the distal end being provided with a first air outlet hole in communication with the third cavity; and the proximal end being located at the rear of the air rod, the proximal end being provided with a first air inlet hole in communication with the third cavity;

[0011] wherein the distal end of the air rod is inserted into the paint storage chamber so that the first air outlet hole is located inside the first cavity or passes through the first cavity;

[0012] the proximal end of the air rod is movably and sealingly connected with the air collection chamber, and is configured to: when the air rod moves forward, the first air inlet hole is located outside the second cavity; and when the air rod moves backward, the first air inlet hole is located inside the second cavity;

[0013] a trigger connected with the air rod and configured to drive the air rod to move forward and backward.

[0014] Further comprising:

[0015] a nozzle cap installed at the front of the paint storage chamber, the nozzle being detachably connected with the paint storage chamber through the nozzle cap.

[0016] Further comprising:

[0017] a sealing assembly, the air rod and the air collection chamber being movably and sealingly connected through the sealing assembly.

[0018] Further, the air rod is an elongated hollow circular tube.

[0019] Further comprising:

[0020] a gun nozzle, the gun nozzle comprising an air inlet end and an air outlet end, the air inlet end being provided with a fourth air inlet hole;

[0021] wherein the air inlet end is connected with the distal end of the air rod;

[0022] the fourth air inlet hole and the first air outlet hole on the distal end of the air rod are in communication;

[0023] the air outlet end is configured to be located inside the nozzle when the air rod moves forward.

[0024] Further comprising:

[0025] a gun nozzle, the gun nozzle comprising an air inlet end and an air outlet end, the air inlet end being provided with a fourth air inlet hole;

[0026] wherein the air inlet end and the distal end of the air rod are connected;

[0027] the fourth air inlet hole and the first air outlet hole on the distal end of the air rod are in communication;

[0028] the air outlet end is configured to have a gap with the rear end of the nozzle when the air rod moves forward.

[0029] Further, a second air inlet hole is arranged on the air rod, and the second air inlet hole is arranged opposite to the first air inlet hole in the radial direction of the air rod.

[0030] Further, a boss is arranged on the air rod, the boss is located between the distal end and the proximal end, and a pad is mounted on the boss, and the trigger drives the air rod to move forward and backward through the pad.

[0031] Further, it further comprises:

[0032] a handle, and the air inlet channel is arranged inside the handle.

[0033] Further, it further comprises:

[0034] an air flow control valve, and the air flow control valve is arranged inside the handle.

[0035] Further, the air flow control valve comprises:

[0036] a valve body, and the valve body is arranged inside the handle and connected with the air inlet channel, and a third air inlet hole is arranged on the valve body, and the third air inlet hole is configured to be in communication or disconnected with the air inlet channel along with the rotation of the valve body;

[0037] a first dial switch, and the first dial switch is arranged outside the handle and connected with the valve body, and the first dial switch is configured to drive the valve body to rotate.

[0038] Further, the air flow control valve further comprises:

[0039] a second dial switch, and the second dial switch is arranged on the handle on the other side opposite to the first dial switch, and the second dial switch is connected with the valve body, and the second dial switch is configured to drive the valve body to rotate.

[0040] Further, the second dial switch is further configured to be simultaneously driven by the first dial switch and to simultaneously drive the valve body and the first dial switch.

[0041] Further, it further comprises:

[0042] A funnel connector, an upper end of the funnel connector is provided with an opening, the funnel connector is installed at a front part of the spray gun, and a lower end of the funnel connector is in communication with the paint storage chamber.

[0043] Further, further comprising:

[0044] A funnel, the funnel comprising a funnel upper end and a funnel lower end, the funnel upper end is provided with a feeding port, and the funnel lower end is provided with a discharging port;

[0045] The funnel lower end is configured to be installed into the opening of the funnel connector upper end, and the discharging port is in communication with the paint storage chamber.

[0046] Further, the funnel upper end is provided with an internal thread, and the funnel lower end is provided with an external thread matched with the internal thread.

[0047] Further, the trigger comprises:

[0048] A first support, the first support is provided at an upper end of the trigger, and the first support is provided with a first mounting hole;

[0049] A second support, the second support is provided at the upper end of the trigger, and the second support is provided with a second mounting hole;

[0050] A connector, the connector is provided at a lower end of the trigger;

[0051] Wherein,

[0052] The first support and the connector are connected at a first position, and the first position is located at an upper part of the connector;

[0053] The second support and the connector are connected at the first position;

[0054] The trigger is hinged to the spray gun through a pivot pin, the first mounting hole and the second mounting hole.

[0055] Further, the first support and the second support are both connected with the pad block, and the first support and the second support drive the air rod to move forward and backward through the pad block.

[0056] Further, a front part of a lower part of the trigger is provided with a recess to facilitate finger gripping.

[0057] Further, a surface of the recess is provided with a coating, and the coating is made of soft and / or elastic material.

[0058] Further, the sealing assembly comprises:

[0059] A block is installed inside the proximal end of the third cavity of the air rod, and the other end of the block is located inside the gas collecting chamber.

[0060] A second sealing sleeve is installed on the outer side of the gas collecting chamber.

[0061] An adjustable block is installed on and passes through the second sealing sleeve, wherein one end of the adjustable block is located inside the gas collecting chamber, and the other end of the adjustable block is located outside the gas collecting chamber.

[0062] A spring is installed between the block and the second sealing sleeve.

[0063] A knob is installed at the rear end of the adjustable block, and the knob is configured to drive the adjustable block to move in the front-rear direction inside the second cavity by rotating.

[0064] Further, the first end of the block is installed inside the proximal end of the third cavity of the air rod, and the second end of the block is provided with a hole inside, and one end of the adjustable block is configured to move forward and backward in the hole of the second end of the block.

[0065] Further, the block is provided with a second groove, and a sealing ring is installed at the second groove.

[0066] Compared with the prior art, the spraying gun provided by the present application effectively improves the existing spraying gun, and has the following advantages Beneficial effects:

[0067] 1. One air rod can realize the air passage and the closure of the gun nozzle, which reduces the requirement for sealing, has a simple structure, low manufacturing cost, low product precision requirement, and is suitable for batch production.

[0068] 2. The present application is configured with a knob for controlling air intake on both sides of the spraying gun, which is convenient to operate.

[0069] 3. The funnel provided by the present application is a two-piece splicing structure, which can be disassembled during transportation through threaded connection, thereby reducing the transportation volume. BRIEF DESCRIPTION OF DRAWINGS

[0070] FIG. 1 is a schematic diagram of the overall structure of the spraying gun provided by the embodiment of the present application;

[0071] FIG. 2 is a schematic diagram of the overall sealing of the spraying gun provided by the embodiment of the present application;

[0072] FIG. 3 is a schematic diagram of the structure of the air rod and its sealing assembly of the spraying gun provided by the embodiment of the present application;

[0073] Fig. 4 is a schematic diagram of the hopper structure of the spray gun according to the embodiment of the present application;

[0074] Fig. 5 is a schematic diagram of the internal connection structure of the hopper according to the embodiment of the present application;

[0075] Fig. 6 is a schematic diagram of the air flow control valve structure of the spray gun according to the embodiment of the present application;

[0076] Fig. 7 is a schematic diagram of the sealing assembly structure according to the embodiment of the present application;

[0077] Fig. 8 is a schematic diagram of the packing block structure of the sealing assembly according to the embodiment of the present application;

[0078] Fig. 9 is a sectional view of the trigger pre-drawing state according to the embodiment of the present application;

[0079] Fig. 10 is a sectional view of the gun nozzle drawing state according to the embodiment of the present application;

[0080] Fig. 11 is a schematic diagram of the packing block structure of the sealing assembly according to another embodiment of the present application;

[0081] Fig. 12 is a sectional view of another embodiment of the present application.

[0082] The component numbers in the figures are as follows: 2 - air rod, 3 - nozzle, 4 - trigger, 5 - sealing assembly, 6 - air flow control valve, 7 - hopper; 11 - first cavity, 12 - second cavity, 13 - paint storage chamber, 14 - first sealing sleeve, 15 - air collection chamber, 16 - handle, 17 - air inlet, 18 - air inlet pipe, 19 - gun nozzle; 21 - first air inlet hole, 22 - third cavity, 23 - second air outlet hole, 24 - boss; 31 - nozzle cap; 41 - finger grip, 42 - pivot pin, 43 - first support; 51 - packing block, 52 - spring, 53 - adjustable stop block, 54 - second sealing sleeve, 55 - knob; 61 - valve body, 62 - first dial switch, 63 - second dial switch, 64 - third air inlet hole; 71 - hopper connecting piece, 72 - upper end of hopper, 73 - lower end of hopper. DETAILED DESCRIPTION

[0083] The preferred embodiments of the present application are described below with reference to the accompanying drawings, which provide a complete description of the present application to those skilled in the art, and make the technical content of the present application more clear and easy to understand. The present application can be embodied in many different forms of embodiments, and the protection scope of the present application is not limited to the embodiments mentioned herein.

[0084] In the drawings, identical or similar components are denoted by identical numbers throughout the figures. The size and thickness of each component shown in the drawings are arbitrarily shown for the purpose of making the drawings clear, and the size and thickness of each component are not limited to the size and thickness shown in the drawings. The thickness of some components is exaggerated in the drawings for the purpose of making the drawings clear.

[0085] The terms such as "upper", "lower", "front", "rear", "left", "right", "inner", "outer", "side", etc. mentioned in the present application are only the directions in the drawings, and are used only for explanation and illustration of the present application, and are not used to limit the scope of protection of the present application.

[0086] When a component is described as "on" another component, the component can be directly on the other component, or there can be an intermediate component, and the component is on the intermediate component, and the intermediate component is on the other component. When a component is described as "mounted to" or "connected to" another component, it can be understood as being directly "mounted" or "connected", or the component is indirectly "mounted to" or "connected to" the other component through an intermediate component.

[0087] In view of the problems of the existing spray gun, such as complex matching relationship of multiple components inside the gun body, high machining precision requirement of parts, and reliable sealing requirement between multiple devices, the spray gun provided by the embodiment of the present application changes the air inlet mode inside the spray gun, simplifies the matching between the components, effectively reduces the sealing requirement of the entire gun body under the condition that the compressed air is not leaked, reduces the manufacturing cost, and is more suitable for mass production. In the present application, the forward direction in FIG. 1 is the direction of the paint ejection end of the spray gun, and the rearward direction is the direction of the other end relative to the forward direction; the distal end in FIG. 3 is the side of the air rod 2 close to the front end of the spray gun, and the proximal end is the side of the air rod 2 close to the rear end of the spray gun.

[0088] As shown in FIGS. 1-10, the spray gun provided by the embodiment of the present application comprises a paint storage chamber 13, a gas collecting chamber 15, a nozzle 3, an air inlet 17, an air rod 2, and a trigger 4, wherein,

[0089] The paint storage chamber 13 is arranged at the front of the spray gun, and the paint storage chamber 13 has a first cavity 11 inside for storing paint.

[0090] The gas collecting chamber 15 is arranged at the rear of the spray gun, and the gas collecting chamber 15 has a second cavity 12 inside for storing gas.

[0091] The nozzle 3 is configured to be in airtight communication with the paint storage chamber 13, so that paint can flow from the first cavity 11 of the paint storage chamber 13 to the nozzle 3 and be sprayed out by the nozzle 3.

[0092] The air inlet 17 is configured to be able to communicate with the air collecting chamber 15, and the external gas enters the air collecting chamber 15 through the air inlet 17.

[0093] The air rod 2 is internally provided with a third cavity 22 for gas flow, and the air rod 2 has opposite distal and proximal ends along the gas flow direction, the distal end is located at the front of the air rod 2, and the distal end is provided with a first air outlet hole communicating with the third cavity 22; and the proximal end is located at the rear of the air rod 2, and the proximal end is provided with a first air inlet hole 21 communicating with the third cavity 22;

[0094] The distal end of the air rod 2 is inserted into the paint storage chamber 13, so that the first air outlet hole is located inside the first cavity 11 or passes through the first cavity 11.

[0095] The proximal end of the air rod 2 is movably and sealingly connected with the air collecting chamber 15, and is configured to: when the air rod 2 moves forward, the first air inlet hole 21 is located outside the second cavity 12; and when the air rod 2 moves backward, the first air inlet hole 21 is located inside the second cavity 12.

[0096] In some embodiments, the air rod 2 can be provided as an elongated hollow circular tube, and the third cavity 22 for gas flow inside the air rod 2 penetrates the entire air rod 2, the working gas enters the first air inlet hole 21 at the proximal end of the air rod 2 from the air collecting chamber 15, and then enters the third cavity 22 and flows in the third cavity 22, and flows out from the first air outlet hole at the distal end of the air rod 2.

[0097] The trigger 4 is connected with the air rod 2, and is configured to be able to drive the air rod 2 to move forward and backward.

[0098] In the embodiment, the trigger 4 includes a first support 43, a second support (not shown in the figure) and a connecting piece, wherein,

[0099] The first support 43 and the second support are both arranged at the upper end of the trigger 4, the connecting piece is arranged at the lower end of the trigger 4, the first support 43 and the second support are connected with the connecting piece at the same position, and a structure similar to Y type or fork type is formed.

[0100] The first support 43 and the second support are both provided with mounting holes, and the upper end of the trigger 4 is pivotally hinged to the spraying gun through the pivot pin 42 and the mounting holes, and the trigger 4 can drive the air rod 2 to move forward and backward under the action of external force.

[0101] In some embodiments, the first support 43 and the second support are both connected with the pad, and the first support 43 and the second support drive the air rod 2 to move forward and backward through the pad under the action of external force.

[0102] The lower end of the trigger 4 is formed with a finger grip 41, which is in the shape of an elongated strip and extends downward. In order to facilitate the operation of the operator, a recess is formed on the front surface of the finger grip 41, which is convenient for the operator to hold. The front surface of the finger grip 41 is coated with a soft or elastic material.

[0103] As shown in FIG. 1, in the present embodiment, a plurality of support beams are arranged on the spray gun, and the paint storage chamber 13 and the air collecting chamber 15 are fixed together through the beams to form an integral body, which provides overall support for the spray gun.

[0104] In some embodiments of the present application, the spray gun further comprises a nozzle cap 31, which is installed at the front of the paint storage chamber 13. The nozzle 3 is detachably connected to the paint storage chamber 13 through the nozzle cap 31, which facilitates the maintenance and replacement of the nozzle 3.

[0105] As shown in FIG. 1, the spray gun is further provided with a handle 16, which is internally provided with an air inlet channel 17 (as shown in FIG. 9) and an air inlet pipe 18. External air enters the air collecting chamber 15 through the air inlet pipe 18 and the air inlet channel 17. The handle 16 is provided with a mounting hole (as shown in FIG. 2) on the side close to the air collecting chamber 15, which is a through hole and communicates with the air inlet channel 17. The handle 16 is installed with the airflow control valve 6 through the mounting hole. In order to better control the amount of external air entering, the handle 16 is provided with a knob switch, which is used to control the opening degree of the airflow control valve 6 and the air inlet channel 17, so as to control the amount of external air entering. In order to facilitate the operation, the knob switch can be arranged on both sides of the handle 16.

[0106] As shown in FIG. 1, the spray gun further comprises a funnel 7 (as shown in FIG. 4) and a funnel connecting piece 71, which is installed at the front end of the spray gun. Paint is poured into the paint storage chamber 13 through the funnel 7 and the funnel connecting piece 71.

[0107] As shown in Fig. 2 and Fig. 3, the present application simplifies the sealing of the gun body by changing the way of air inlet in the air rod 2. Specifically, in the present embodiment, the air for the operation of the spray gun first enters the air inlet channel 17 in the handle 16 through the air inlet pipe 18 on the handle 16, and then enters the air collecting chamber 15. The air in the air collecting chamber 15 enters the third cavity 22 in the air rod 2 through the first air inlet hole 21 at the proximal end of the air rod 2, and flows in the third cavity 22. In the present embodiment, when the spray gun is not in operation, the air rod 2 is in the initial state, in which the first air inlet hole 21 at the proximal end of the air rod 2 is located outside the second cavity 12, and the air in the air collecting chamber 15 cannot enter the third cavity 22 in the air rod 2. When the spray gun starts to operate, the operator pulls the trigger 4, which drives the air rod 2 to move backward in the second cavity 12. When the air rod 2 moves a certain distance, the first air inlet hole 21 at the proximal end of the air rod 2 is located inside the second cavity 12, and the air in the air collecting chamber 15 starts to enter the third cavity 22 in the air rod 2, and then flows in the third cavity 22.

[0108] Since the present application realizes air inlet through the air inlet hole at the proximal end of the air rod 2, the control valve and its supporting bushing and other components for controlling the air inlet in the air rod are no longer needed, thereby effectively reducing the sealing requirement for the entire gun body and the manufacturing cost.

[0109] In the present embodiment, the following scheme is adopted to realize the sealing: the sealing assembly 5 is used to prevent the air from leaking from the air collecting chamber 15 and the air rod 2.

[0110] Specifically, it comprises:

[0111] The sealing assembly 5 comprises a plug 51, a second sealing sleeve 54 and an adjustable stopper 53. The second sealing sleeve 54 is installed on the outer side of the air collecting chamber 15, and the adjustable stopper 53 passes through the second sealing sleeve 54. One end of the adjustable stopper 53 is inside the air collecting chamber 15, and the other end is outside the air collecting chamber 15. The adjustable stopper 53 and the second sealing sleeve 54 cooperate to seal the rear part of the air collecting chamber 15.

[0112] On the other hand, one end of the plug 51 is installed inside the proximal end of the third cavity 22 in the air rod 2, which seals the proximal end of the third cavity 22 in the air rod 2, so that the air in the third cavity 22 in the air rod 2 cannot leak from the proximal end of the air rod 2. One or more (for example, two) recesses can also be provided in the middle part of the air rod 2 between the first air inlet hole 21 and the boss 24 to install sealing washers, so as to seal the middle part of the air rod 2, so that the air in the third cavity 22 in the air rod 2 cannot leak from the middle part of the air rod 2.

[0113] In order to better ensure the sealing effect, in some embodiments, sealing washers can also be installed on the second sealing sleeve 54 and the adjustable stopper 53 to provide better sealing effect.

[0114] In some embodiments, a groove can also be provided on the stopper 51 to install a sealing washer to further seal the proximal end of the air rod 2.

[0115] In some other embodiments, the sealing assembly 5 further comprises a spring 52 installed between the stopper 51 and the second sealing sleeve 54. When the air rod 2 moves backward and starts to intake air, the spring 52 is compressed to generate a spring force, which acts on the stopper 51 to reduce the pressure of the air inside the air rod 2 on the stopper 51, thereby preventing the stopper 51 from exiting the proximal end of the air rod 2 and ensuring the sealing effect of the proximal end of the air rod 2.

[0116] As shown in FIG. 2, in the present embodiment, a nozzle cap 31 is installed at the front end of the paint storage chamber 13, and a first sealing sleeve 14 is installed at the rear end of the paint storage chamber 13. The paint storage chamber 13 is sealed by the cooperation of the nozzle cap 31 and the first sealing sleeve 14. In order to achieve better sealing effect, sealing washers can also be designed on the nozzle cap 31 and the first sealing sleeve 14.

[0117] As shown in FIG. 3, the air rod 2 is designed as an elongated hollow circular tube, and a third cavity 22 (as shown in FIG. 9) for air flow is provided inside the air rod 2, which can pass through the entire air rod. The air rod 2 has opposite distal and proximal ends along the direction of air flow. The distal end is located at the front of the air rod 2, and a first air outlet (not shown in the figure) is provided on the distal end to communicate with the third cavity 22. The proximal end is located at the rear of the air rod 2, and an air inlet is provided on the proximal end to communicate with the third cavity 22.

[0118] In some embodiments, two air inlets are provided on the air rod 2 in the radial direction to increase the air intake amount.

[0119] The distal end of the air rod 2 is inserted into the paint storage chamber 13, so that the first air outlet is located inside the first cavity 11 or passes through the first cavity 11.

[0120] The proximal end of the air rod 2 is movably sealed with the air collecting chamber 15. When the air rod 2 moves forward, the first air inlet 21 is located outside the second cavity 12; and when the air rod 2 moves backward, the first air inlet 21 is located inside the second cavity 12.

[0121] In some embodiments, a boss 24 is provided between the distal end of the air rod 2 and the proximal end of the air rod 2, and a pad is installed on the boss 24, through which the trigger 4 drives the air rod 2 to move forward and backward.

[0122] In some preferred embodiments, the length of the boss 24 can be set as required, the pad on the boss 24 can also be a circular pad, and a locking piece is arranged on the air rod 2 to fix the circular pad, so that the circular pad is fixed on one side of the boss 24.

[0123] In some embodiments, the distal end of the air rod 2 is also provided with a gun nozzle 19, through which the air rod 2 can extend into the nozzle 3 or have a predetermined gap with the nozzle 3.

[0124] The gun nozzle 19 comprises an air inlet end and an air outlet end, the air inlet end is connected with the distal end of the air rod 2, and the air outlet end can be outside the nozzle 3 or extend into the nozzle 3. When the air outlet end of the gun nozzle 19 extends into the nozzle 3, the paint in the paint storage chamber 13 cannot enter the nozzle 3.

[0125] The air inlet end is further provided with a fourth air inlet hole, and the air outlet end is provided with a second air outlet hole 23. The fourth air inlet hole is in communication with the first air outlet hole at the distal end of the air rod 2, and the gas in the air rod 2 enters the fourth air inlet hole of the gun nozzle 19 through the first air outlet hole, and then flows out through the second air outlet hole 23.

[0126] Compared with the prior art, the spraying gun provided by the application can realize air passage and gun nozzle sealing by optimizing the air inlet mode and using one air rod, which not only reduces the requirement for sealing, but also has simple structure, low manufacturing cost, low product precision requirement and is suitable for batch production; and the knobs for controlling air inlet are arranged on both sides of the spraying gun, which is more convenient to operate.

[0127] The application will be described in detail below with reference to the preferred embodiments of the application.

[0128] As shown in FIGS. 1-10, the preferred embodiment provides a spraying gun, which comprises a paint storage chamber 13, a gas collecting chamber 15, an air rod 2, a nozzle 3, a trigger 4 and a sealing assembly 5. The air rod 2 is installed inside the spraying gun and penetrates through the entire gun body. The spraying gun is connected as a whole by a plurality of cross beams arranged in the middle. The paint storage chamber 13 is installed at the front of the spraying gun, the gas collecting chamber 15 is installed at the rear of the spraying gun, the nozzle 3 is installed at the discharge port at the front end of the paint storage chamber 13, the trigger 4 is hinged to the spraying gun through a pivot pin 42, the trigger 4 can rotate around the pivot pin 42 to the front and rear of the spraying gun, and the rotation of the trigger 4 can drive the air rod 2 to move forward and backward in the gas collecting chamber 15.

[0129] In the embodiment, a funnel connector 71 is arranged on the spray gun, the paint to be sprayed is poured into the paint storage chamber 13 through the funnel connector 71, and sprayed out through the nozzle 3. The funnel connector 71 is installed at the front end of the spray gun and connected with the paint storage chamber 13. The nozzle 3, the nozzle cap 31 and the first sealing sleeve 14 are matched (as shown in FIG. 2), so as to form a closed first cavity 11 inside the paint storage chamber 13. The paint to be sprayed is poured into the first cavity 11 through the funnel 7 and the funnel connector 71. The shape of the funnel 7 is shown in FIG. 4.

[0130] As shown in FIG. 1, in the embodiment, the air rod 2 is installed inside the spray gun. The distal end of the air rod 2 extends into the paint storage chamber 13 through the first sealing sleeve 14. The distal end of the air rod 2 is provided with a gun nozzle 19. The gun nozzle 19 can extend into the nozzle 3 of the discharge port. Under the action of the gas in the gas collecting chamber 15, the gun nozzle 19 is matched with the nozzle 3 to complete the spraying of the paint.

[0131] In the embodiment, the external gas enters the air inlet 17 arranged inside the handle 16 through the air inlet pipe 18, and enters the gas collecting chamber 15 through the air flow control valve 6 arranged inside the handle 16 (as shown in FIG. 6). The second cavity 12 is arranged inside the gas collecting chamber 15. The second cavity 12 is a closed space formed by the cooperation of the air rod 2 and the sealing assembly 5 (as shown in FIG. 2), which can store the external entering gas. The gas can be compressed air or other gas.

[0132] As shown in FIG. 1, in the embodiment, the forward and backward movement of the air rod 2 is realized by the trigger 4 installed on the spray gun. The trigger 4 is designed as Y-shaped or fork-shaped. The upper part of the trigger 4 can be designed as a symmetrical structure. The trigger 4 includes a first support 43, a second support and a connecting piece. The first support 43 and the second support are arranged at the upper end of the trigger 4, and the connecting piece is arranged at the lower end of the trigger 4. The first support 43 and the second support are connected with the connecting piece. The connection position can be located at the same position of the connecting piece, forming a Y-shaped or fork-shaped structure. The first support 43 and the second support are both provided with mounting holes. The upper end of the trigger 4 is pivotally hinged to the spray gun through the pivot pin 42 and the mounting holes, and can rotate forward and backward around the pivot pin 42, so as to drive the air rod 2 to move forward and backward.

[0133] In some embodiments, the first support 43 and the second support are connected with the pad block arranged on the boss 24 of the air rod 2. Under the action of external force, the first support 43 and the second support drive the air rod 2 to move forward and backward through the pad block.

[0134] In order to better drive the front and back movement of the air rod 2, the first support 43 and the second support are composed of two parts: a first part and a second part. The top end of the first part is provided with a mounting hole. Through the mounting hole and the pivot pin 42, the first support 43 and the second support are pivotally hinged to the spray gun and can rotate forward and backward around the pivot pin 42. The second part is fixedly connected to the side surface of the first part near the paint storage chamber 13. The first part of the first support 43 and the second support is near the side surface of the pad, and the second part of the first support 43 and the second support is near the front surface of the pad. When the operator tightens the trigger 4, the trigger 4 rotates to the rear end around the pivot pin 42, and drives the first support 43 and the second support to press the front surface of the pad on the air rod 2, thereby pushing the air rod 2 to move to the rear end and compressing the spring 52 in the sealing assembly 5; after the operator releases the trigger 4, the spring 52 begins to recover and reversely pushes the air rod 2 to move to the front end. Through the boss 24 on the air rod 2, the pad is driven to move to the front end, and the pad drives the trigger 4 to rotate reversely, so that the trigger 4 gradually recovers to the original state, and the air rod 2 also gradually stops moving.

[0135] The lower part of the trigger 4 is provided with a finger grip 41 which is elongated and extends downward. In order to facilitate the operation of the operator, a recess for gripping is arranged on the front surface of the finger grip 41, which is convenient for the operator to hold with multiple fingers. Considering that the working time is relatively long during spraying, a coating layer made of soft or elastic material can be covered on the front surface of the finger grip 41. These coating layers can also be a separate component which can be easily installed and removed from the finger grip 41.

[0136] As shown in FIG. 3, the air rod 2 provided by the embodiment is a whole elongated circular tube, and other shapes can also be adopted. However, the air rod 2 needs to be provided with a third cavity 22 which can be a through hole. In this way, the gas in the gas collecting chamber 15 can enter the inside of the air rod 2, and under the driving of pressure, the gas can enter the gun nozzle 19 at the far end of the air rod 2 and cooperate with the spray nozzle 3 to realize the spraying of paint. The near end of the third cavity 22 is sealed by the plug 51 of the sealing assembly 5 to avoid the gas entering the inside of the air rod 2 from leaking out. In order to ensure the sealing effect, a corresponding sealing gasket can also be arranged on the plug 51.

[0137] In order to facilitate the gas in the gas collecting chamber 15 to enter the cavity inside the air rod 2, the near end of the air rod 2 is designed with an air inlet hole. When the air inlet hole enters the inside of the gas collecting chamber 15, the air inlet hole is in communication with the gas collecting chamber 15, and the gas in the gas collecting chamber 15 will enter the third cavity 22 inside the air rod 2. In the embodiment, under the action of the trigger 4, the air rod 2 moves to the rear end of the spray gun. When the air inlet hole is in communication with the gas collecting chamber 15, the gas will quickly enter the air rod 2.

[0138] As shown in Fig. 3, the air inlet holes are arranged on the proximal end of the air rod 2 along the outer circumferential surface of the air rod 2. According to actual needs, multiple air inlet holes can be arranged on the same circumference of the air rod 2 to increase the air inlet amount and increase the spraying pressure. These air inlet holes can be uniformly distributed along the same outer circumferential surface of the air rod 2. In the embodiment, two air inlet holes are arranged, i.e., a first air inlet hole 21 and a second air inlet hole (not shown in the figure), which are oppositely arranged on the same circumference close to the proximal end of the air rod 2.

[0139] As shown in Figs. 3 and 7, the proximal end of the air rod 2 is further provided with a sealing device, which is a sealing assembly 5 in the embodiment. As shown in Fig. 7, the sealing assembly 5 includes a plug 51, a spring 52, an adjustable stopper 53, a second sealing sleeve 54, and a knob 55. The plug 51 is installed on the proximal end of the third cavity 22 of the air rod 2 to seal the proximal end of the air rod 2 and prevent the gas in the third cavity 22 from leaking. The second sealing sleeve 54 is installed on the outer surface of the air collecting chamber 15 to seal the air collecting chamber 15 and prevent the gas in the air collecting chamber 15 from leaking. The adjustable stopper 53 passes through the second sealing sleeve 54 at one end and is provided with the knob 55 at the other end. The adjustable stopper 53 can move forward and backward under the operation of the knob 55 to affect the movement distance of the air rod 2. The spring 52 can restore the air rod 2 to the initial position when there is no external force, thereby cutting off the communication between the air inlet hole of the air rod 2 and the air collecting chamber 15, preventing the external gas from entering the air rod 2, and stopping the spraying work of the paint. In addition, the spring 52 can also apply a counterforce to the plug 51 when it is under pressure, thereby preventing the plug 51 from being pushed out of the air rod 2 by the gas in the air rod 2.

[0140] As shown in Fig. 7, in order to increase the sealing performance of the sealing assembly 5 and better seal the air collecting chamber 15, the second sealing sleeve 54 can be matched with an O-ring or other sealing devices. As shown in Fig. 8, the plug 51 can be designed with a groove in the middle, and a sealing device such as an O-ring can be installed on the groove to improve the sealing effect of the proximal end of the air rod 2. In the embodiment, one end of the plug 51 is a solid cylinder, and the other end is a hollow cylinder. The inner hole of the hollow cylinder can have any shape such as a circular, quadrilateral, pentagonal, and hexagonal shape, which can be matched with one end of the adjustable stopper 53. In order to provide better adjustment operation, recesses can be provided on the outer surface of the knob 55, which can increase the friction.

[0141] As shown in Fig. 4, the funnel 7 is provided with an opening at the top for easy pouring of paint. The lower end is conical in shape and the size of the cone matches the inner diameter of the top of the funnel connector 71. The lowest end of the funnel 7 is provided with a funnel opening. In order to facilitate operation, a handle is provided at the top end of the funnel 7, and a cover plate with a hole is provided at the top opening to prevent paint from splashing when pouring.

[0142] In order to facilitate transportation and reduce the transportation volume, the funnel 7 is designed as a two-piece splicing structure, which is divided into a funnel upper end 72 and a funnel lower end 73. The funnel upper end 72 is in a hollow cylindrical shape, and the funnel lower end 73 is in a conical shape. The funnel upper end 72 and the funnel lower end 73 are connected through threads. The funnel upper end 72 is provided with internal threads, and the funnel lower end 73 is provided with matching external threads, as shown in FIG. 5. Through this two-piece splicing structure, the funnel 7 can be assembled or disassembled according to different use scenarios. For example, in a transportation environment, the funnel 7 can be disassembled, and the funnel lower end 73 can be placed inside the funnel upper end 72, thereby reducing the occupied space of the entire funnel 7. In particular, in the process of large-scale transportation, this structure is more space-saving in packaging, and it is more convenient for transportation.

[0143] As shown in FIG. 1, in this embodiment, in order to provide working gas for the spray gun, a handle 16 is provided on the spray gun. An air inlet and an air inlet channel 17 are also provided inside the handle 16. The air inlet can be externally connected to an air inlet pipe 18. External gas enters the air inlet channel 17 inside the handle 16 through the air inlet pipe 18, and then enters the gas collecting chamber 15 through the air inlet channel 17, thereby providing working gas for the entire spray gun.

[0144] In order to better control the amount of external gas entering, the handle 16 is provided with a mounting hole on the side close to the gas collecting chamber 15. The mounting hole is a through hole and is in communication with the air inlet channel 17. A gas flow control valve 6 is installed through the mounting hole to control the amount of external gas entering. In this embodiment, a knob switch is provided on the handle 16 to control the opening of the gas flow control valve 6, adjust the opening and closing degree of the gas flow control valve 6 and the air inlet channel 17, and thereby control the amount of external gas entering. In order to facilitate operation, the knob switch can be provided on both sides of the handle 16.

[0145] As shown in FIG. 6, the gas flow control valve 6 includes a valve body 61 and a knob switch. The knob switch is installed at both ends of the valve body 61 and is attached to the outer surface of the mounting hole of the handle 16. The valve body 61 is provided with a third air inlet hole 64 in the middle. The third air inlet hole 64 can be in communication or disconnected with the air inlet channel 17 to control the gas entering the gas collecting chamber 15 through the third air inlet hole 64. The knob switch includes a first knob switch 62 installed at one end of the valve body 61. The first knob switch 62 can be rotated and rotate the valve body 61 in the process of rotation, thereby changing the opening and closing degree of the third air inlet hole 64 and the air inlet channel 17 and controlling the amount of gas entering. In this embodiment, a second knob switch 63 is also provided, which is installed at the other end of the valve body 61. The second knob switch 63 can also be rotated and rotate the valve body 61 in the process of rotation, thereby changing the opening and closing degree of the third air inlet hole 64 and the air inlet channel 17 and controlling the amount of gas entering.

[0146] The two dials are arranged on both sides of the spraying gun, mainly for the convenience of operation. The two dials on both sides drive the valve body 61 to rotate, that is, the second dial switch 63 is driven by the first dial switch 62, and the second dial switch 63 can also drive the valve body 61 and the first dial switch 62.

[0147] The first dial switch 62 and the second dial switch 63 can be arranged in a rotating range, for example, 0°-90°. When rotating 0°, the third air inlet hole 64 and the air inlet channel 17 are completely disconnected, and the gas cannot enter the gas collecting chamber 15 through the third air inlet hole 64;

[0148] When rotating 90°, the third air inlet hole 64 and the air inlet channel 17 are completely connected, and the gas flow entering the gas collecting chamber 15 through the third air inlet hole 64 is the largest.

[0149] As shown in FIGS. 9-10, the specific operation steps of the spraying gun provided in the embodiment when performing spraying work include (the solid arrow in FIGS. 9 and 10 indicates the gas flow direction, and the dashed arrow in FIG. 10 indicates the paint flow direction):

[0150] Step 1: Connect external gas.

[0151] Connect the external gas source through the air inlet pipe 18, and the external gas enters the air inlet pipe 18 and the air inlet channel 17.

[0152] Step 2: Rotate the dial switch to ventilate.

[0153] Rotate the first dial switch 62 or the second dial switch 63, and the external gas enters the gas collecting chamber 15 through the third air inlet hole 64. At this time, since the air rod 2 is in the initial position, the first air inlet hole 21 and the second air inlet hole of the air rod 2 are still outside the gas collecting chamber 15, and cannot be connected with the gas collecting chamber 15, and the gas cannot enter the third cavity 22 inside the air rod 2.

[0154] Step 3: Pour the paint.

[0155] Pour the paint to be sprayed into the paint storage chamber 13 of the spraying gun through the funnel 7 and the funnel connecting piece 71. At this time, since the air rod 2 is in the initial position, the spraying gun has not started spraying work.

[0156] Step 4: Pull the trigger to ventilate first.

[0157] Pull the trigger 4 to rotate about 5°, and the air rod 2 retreats about 1.5 mm to realize ventilation. The gas in the gas collecting chamber 15 enters the air rod 2 through the first air inlet hole 21 and the second air inlet hole, and blows out the residue in the discharge port through the gun nozzle 19 first, as shown in FIG. 9.

[0158] Step 5: Start spraying.

[0159] Continue to press the trigger 4, the paint in the paint storage chamber 13 is sprayed from the nozzle 3 under the action of the gas sprayed from the nozzle 3, and the spraying work of the paint is started, as shown in Fig. 10.

[0160] Step 6: end of spraying.

[0161] When the spraying of the paint to be sprayed is completed or the spraying work needs to be stopped in the middle, the trigger 4 is released, and the compressed spring 52 starts to push the air rod 2 to move forward, and the air rod 2 gradually returns to the initial position, and the first air inlet hole 21 and the second air inlet hole gradually exit to the outside of the gas collecting chamber 15, so that the gas supply of the air rod 2 is cut off, and the spraying work is stopped.

[0162] In the above working steps, the first three steps have no absolute operation sequence, and the operator can adjust according to his own working habit, and the sequence does not affect the normal work of the spraying gun.

[0163] The spraying gun provided by the embodiment changes the air inlet mode, the air inlet channel at the movable proximal end of the air rod is used for air inlet, the distal end of the air rod extends into the nozzle of the discharge port to realize the closure of the nozzle, so that the air inlet gas path and the closure of the nozzle can be realized by one air rod, compared with the prior art, the requirement for sealing is reduced, the structure is simple, the manufacturing cost is low, the product precision requirement is not high, and batch production is suitable. Meanwhile, the knob switches are arranged on both sides of the spraying gun, which is convenient for operation; the funnel of the embodiment adopts a two-piece splicing structure and can be detachably installed together, thereby effectively reducing the transportation volume.

[0164] In other embodiments of the present application, a groove is designed in the middle of the plug 51 of the sealing assembly 5 shown in Fig. 8. Considering that this design is relatively complex, the machining difficulty of the plug 51 is increased, thereby increasing the machining cost of the whole spraying gun. The structure of the plug 51 in the sealing assembly 5 is optimized to facilitate machining and simplify the machining process and cost.

[0165] As shown in Fig. 11, the plug 51 provided by another embodiment of the present application can adopt a cylindrical or conical shape, and no groove is designed in the middle. One end of the plug 51 is solid and is inserted into the through hole at the proximal end of the air rod 2 to seal the air rod 2 by interference fit or threaded mode; the other end of the plug 51 is internally provided with a hole, so that one end of the adjustable stop block 53 is inserted into the hole of the plug 51.

[0166] The technical effect of the embodiment is that the spraying gun provided by the embodiment is designed as a cylindrical or conical shape as a whole, and no groove is designed in the middle, which is more convenient for machining and reduces the machining cost.

[0167] In some other embodiments of the present application, considering that the gun nozzle 19 installed at the distal end of the air rod 2 extends into the nozzle 3 of the discharge port, when performing the spraying operation, it is necessary to first ventilate and then spray the material. First, ventilate to blow out the residue of the discharge port, and continue to press the trigger 4 to make the gun nozzle 19 continuously spray the material. This operation affects the spraying efficiency, especially in the scenario of continuous spraying operation in a short time.

[0168] Therefore, another embodiment of the present application provides another technical solution, as shown in FIG. 12. The gun nozzle 19 installed at the distal end of the air rod 2 does not extend into the nozzle 3, but has a predetermined gap with the nozzle 3. In this structure, the air rod 2 can ventilate and discharge the material, thereby improving the spraying efficiency and reducing the waste of paint.

[0169] The spraying gun provided in the embodiment does not extend the distal end of the air rod into the nozzle, ventilates and discharges the material, improves the operation efficiency, and can be applied to the conventional nozzle structure on the market.

[0170] The above is only the preferred embodiment of the present application. Those skilled in the art can make some improvements and refinements to the above technical solutions without departing from the principles of the present application. These improvements and refinements should also be considered within the protection scope of the present application.

Claims

1. A spray gun, characterized in that, The application relates to a paint spraying gun. The paint spraying gun comprises: a paint storage chamber arranged at the front of the paint spraying gun, the paint storage chamber having a first cavity inside for storing paint; a gas collecting chamber arranged at the rear of the paint spraying gun, the gas collecting chamber having a second cavity inside for storing gas; a nozzle configured to be in airtight communication with the paint storage chamber so that paint can flow from the first cavity of the paint storage chamber to the nozzle; a gas inlet channel configured to be in communication with the gas collecting chamber; a gas rod having a third cavity inside for gas flow, the gas rod having opposite distal and proximal ends along the direction of gas flow, the distal end being located at the front of the gas rod, the distal end being provided with a first gas outlet hole in communication with the third cavity, and the proximal end being located at the rear of the gas rod, the proximal end being provided with a first gas inlet hole in communication with the third cavity; wherein the distal end of the gas rod is inserted into the paint storage chamber so that the first gas outlet hole is located inside the first cavity or passes through the first cavity; the proximal end of the gas rod is movably and airtightly connected with the gas collecting chamber and is configured to: when the gas rod moves forward, the first gas inlet hole is located outside the second cavity; and when the gas rod moves backward, the first gas inlet hole is located inside the second cavity; 2. The spray gun of claim 1, wherein, a trigger connected with the gas rod and configured to drive the gas rod to move forward and backward. Further comprising:

3. The spray gun of claim 2, wherein, a nozzle cap mounted at the front of the paint storage chamber, the nozzle being detachably connected with the paint storage chamber through the nozzle cap. Further comprising:

4. The spray gun of claim 3, wherein, a sealing assembly by which the gas rod is movably and airtightly connected with the gas collecting chamber.

5. The spray gun of claim 4, wherein, The gas rod is an elongated hollow circular tube. Further comprising: a gun nozzle comprising a gas inlet end and a gas outlet end, the gas inlet end being provided with a fourth gas inlet hole; wherein the gas inlet end is connected with the distal end of the gas rod; the fourth gas inlet hole is in communication with the first gas outlet hole on the distal end of the gas rod; 6. The spray gun of claim 4, wherein, the gas outlet end is configured to be located inside the nozzle when the gas rod moves forward. Further comprising: a gun nozzle comprising a gas inlet end and a gas outlet end, the gas inlet end being provided with a fourth gas inlet hole; wherein the gas inlet end is connected with the distal end of the gas rod; the fourth gas inlet hole is in communication with the first gas outlet hole on the distal end of the gas rod; 7. The spray gun of claim 5 or 6, wherein, the gas outlet end is configured to have a gap with the rear end of the nozzle when the gas rod moves forward.

8. The spray gun of claim 7, wherein, A second gas inlet hole is further arranged on the gas rod, the second gas inlet hole being arranged opposite to the first gas inlet hole in the radial direction of the gas rod.

9. The spray gun of claim 8, wherein, A boss is arranged on the gas rod, the boss being located between the distal end and the proximal end, a pad being mounted on the boss, the trigger driving the gas rod to move forward and backward through the pad. Further comprising:

10. The spray gun of claim 9, wherein, a handle, the gas inlet channel being arranged inside the handle. Further comprising:

11. The spray gun of claim 10, wherein, a gas flow control valve arranged inside the handle. The gas flow control valve comprises: a valve body disposed inside the handle and connected with the air inlet channel, the valve body being provided with a third air inlet hole configured to be in communication with or disconnected from the air inlet channel as the valve body rotates; a first dial switch disposed outside the handle and connected with the valve body, the first dial switch being configured to drive the valve body to rotate.

12. The spray gun of claim 11, wherein, The air flow control valve further comprises: a second dial switch disposed on the handle at the other side opposite to the first dial switch, the second dial switch being connected with the valve body, the second dial switch being configured to drive the valve body to rotate.

13. The spray gun of claim 12, wherein: the second dial switch is further configured to be simultaneously driven by the first dial switch and to simultaneously drive the valve body and the first dial switch.

14. The spray gun of claims 5 or 6, wherein, Further comprising: a funnel connector having an opening at the upper end thereof, the funnel connector being mounted at the front of the spray gun, the lower end of the funnel connector being in communication with the paint storage chamber.

15. The spray gun of claim 14, wherein, Further comprising: a funnel comprising a funnel upper end and a funnel lower end, the funnel upper end being provided with an inlet, the funnel lower end being provided with an outlet; the funnel lower end being configured to be mounted into the opening of the funnel connector, and the outlet being in communication with the paint storage chamber.

16. The spray gun of claim 15, wherein, the funnel upper end being provided with an internal thread, the funnel lower end being provided with an external thread matched with the internal thread.

17. The spray gun of claim 8, wherein, The trigger comprises: a first bracket disposed at the upper end of the trigger, the first bracket being provided with a first mounting hole; a second bracket disposed at the upper end of the trigger, the second bracket being provided with a second mounting hole; a connector disposed at the lower end of the trigger; wherein, the first bracket is connected with the connector at a first position, the first position being located at the upper portion of the connector; the second bracket is connected with the connector at the first position; the trigger is hinged to the spray gun through a pivot pin, the first mounting hole and the second mounting hole.

18. The spray gun of claim 17, wherein, The first bracket and the second bracket are both connected with the pad block, and the first bracket and the second bracket drive the air rod to move forward and backward through the pad block.

19. The spray gun of claims 5 or 6, wherein, The sealing assembly comprises: a plug having one end mounted inside the proximal end of the third cavity of the air rod, and the other end located inside the air collection chamber; a second sealing sleeve mounted on the outer side of the air collection chamber; an adjustable stopper mounted on and penetrating through the second sealing sleeve, wherein one end of the adjustable stopper is located inside the air collection chamber, and the other end of the adjustable stopper is located outside the air collection chamber; a spring mounted between the plug and the second sealing sleeve; a knob mounted at the rear end of the adjustable stopper, the knob being configured to drive the adjustable stopper to move in the forward and backward directions inside the second cavity by rotating.

20. The spray gun of claim 19, wherein, The first end of the block is mounted inside the proximal end of the third cavity of the air rod, and the second end of the block is provided with a hole inside, and one end of the adjustable block is configured to move back and forth in the hole of the second end of the block.

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