Lance

Abstract

The application discloses a spray gun, comprising: a first housing; a fan module housed in the first housing for generating airflow, the fan module comprising a brushless motor and a fan; a nozzle assembly comprising a nozzle having a liquid outlet; a spray rod assembly configured to move relative to the nozzle along its longitudinal axis to open or close the liquid outlet; the fan module works to drive the airflow to the nozzle assembly and atomize and spray the liquid at the nozzle; wherein the power range of the brushless motor is between 250W-500W, the rotational speed range is between 60000rpm-120000rpm, and the longitudinal axis of the spray rod assembly is parallel or coincident with the rotational axis of the brushless motor. The spray gun provided by the application reduces the structural size of the fan module by adopting a high-speed brushless motor, thereby reducing the weight of the user when holding the device; and the longitudinal axis of the spray rod assembly is parallel or coincident with the rotational axis of the motor, a more ergonomic and more compact overall appearance is obtained, and the user experience is improved.

Description

Technical Field

[0001] This application relates to the field of handheld spraying equipment, and more particularly to a spray gun. Background Technology

[0002] In home decoration, painting work on surfaces such as walls and ceilings has always been a significant part, requiring considerable workload and skill. Therefore, as the core component for paint spraying, the processing capacity and user comfort of paint spraying equipment have always been a focus of industry attention and improvement. Spray painting equipment is a typical example of paint spraying equipment.

[0003] HVLP type paint spray guns use a centrifugal fan to blow air out of the duct, atomizing the paint at the nozzle through the Venturi principle. However, current HVLP type paint spray guns all use DC low-speed brushed motors, which are large and heavy, leading to high workload for users. Furthermore, the low speed of DC brushed motors requires a sufficiently large fan diameter to increase airflow, resulting in a large overall size and concentrated weight at the rear of the spray gun, making it difficult for users to hold.

[0004] Therefore, it is necessary to propose a new spray gun to solve the above problems. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, the technical problem to be solved by the present invention is to provide a spray gun that can reduce the overall weight and optimize the overall layout, thereby reducing the user's grip burden and improving the user's operating experience.

[0006] To solve the above problems, the technical solution of the present invention is: a spray gun, comprising: a first housing; a fan module housed within the first housing for generating airflow; the fan module including a brushless motor and a fan driven by the brushless motor; a sleeve formed or mounted on the first housing; a nozzle assembly disposed at one end of the sleeve away from the fan module, the nozzle assembly having a liquid outlet; and a spray bar assembly housed within the sleeve; the spray bar assembly is configured to move along its longitudinal axis to open or close the liquid outlet; wherein the rated power of the brushless motor is between 250W and 500W, the rotation speed is between 60,000 and 120,000 rpm, and the rotation axis of the brushless motor is parallel to or coincident with the longitudinal axis of the spray bar assembly.

[0007] In one possible implementation, the maximum outer diameter of the wind turbine module is defined as D1, where D1 is between 30-80 mm.

[0008] In one possible implementation, when 30mm ≤ maximum outer diameter D1 ≤ 45mm, the rotation axis of the brushless motor is aligned with the longitudinal axis of the spray bar assembly.

[0009] In one possible implementation, when 45 mm < maximum outer diameter D1 ≤ 80 mm, the rotation axis of the brushless motor is set parallel to the longitudinal axis of the spray bar assembly, and the distance L1 between them satisfies: (D1-45) / 2+2.5mm≤L1≤20mm.

[0010] In one possible implementation, the spray gun includes a handle for the operator to hold, and the axis of rotation of the brushless motor is further away from the handle than the longitudinal axis of the spray bar assembly in a direction perpendicular to the longitudinal axis.

[0011] In one possible implementation, the spray gun further includes a wind pressure chamber radially supported within the first housing, and the fan module is housed within the wind pressure chamber.

[0012] In one possible implementation, the fan module further includes a fan housing, in which the fan and brushless motor are arranged sequentially along the direction of airflow; the fan housing is provided with an air inlet ring cover and an air outlet; when the fan rotates, the airflow enters the fan housing from the air inlet ring cover and flows out from the air outlet to the air pressure chamber.

[0013] In one possible implementation, the fan is rotatably disposed within the air inlet ring cover, and the outer diameter of the air inlet ring cover corresponding to the axial position of the fan blades is the maximum outer diameter D1 of the fan module.

[0014] In one possible implementation, the fan module further includes a circuit board for controlling the operation of the brushless motor. The circuit board is fixedly connected to the fan housing and is arranged downstream of the brushless motor along the airflow direction.

[0015] In one possible implementation, the outer diameter of the fan housing corresponding to the axial position of the circuit board is D2, where D2≤D1.

[0016] In one possible implementation, the size of D2 ranges from 40mm to 55mm.

[0017] In one possible implementation, the fan module is supported in the air pressure chamber by a shock-absorbing structure, so that the vibration generated by the high-speed motor is attenuated by the shock-absorbing structure before being transmitted to the first housing, thereby reducing the user's grip vibration.

[0018] Beneficial effects:

[0019] The spray gun provided in this application uses a high-speed brushless motor in its fan module, with a power range of 250-500W and a speed range of 60,000-120,000rpm. This allows for a reduction in the size of the fan module while maintaining the same working capacity, thereby reducing the overall weight of the machine and the burden on the user when holding the spray gun. Furthermore, with the significant reduction in the structural dimensions of the fan module, the longitudinal axis of the spray bar assembly can be set parallel to or coincide with the rotation axis of the motor, making the entire machine more compact and ergonomic.

[0020] Specific embodiments of the present invention are disclosed in detail with reference to the following description and accompanying drawings, indicating how the principles of the invention can be employed. It should be understood that the embodiments of the present invention are not limited in scope as a result.

[0021] Features described and / or illustrated for one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments.

[0022] It should be emphasized that the term "including / comprises" as used herein refers to the presence of a feature, whole, step, or component, but does not exclude the presence or addition of one or more other features, wholes, steps, or components. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the spray gun provided in the first embodiment of this application;

[0025] Figure 2 yes Figure 1 A cross-sectional view of the spray gun shown;

[0026] Figure 3a yes Figure 1 The exploded view of the spray gun shown involves the fan module; Figure 3b yes Figure 3a A schematic diagram of the wind turbine module shown from another perspective;

[0027] Figure 4 This is a cross-sectional view of the spray gun provided in the second embodiment of this application;

[0028] Figure 5 This is a cross-sectional view of the spray gun provided in the third embodiment of this application;

[0029] Figure 6 This is a cross-sectional view of the spray gun provided in the fourth embodiment of this application;

[0030] Figure 7 This is a cross-sectional view of the spray gun provided in the fifth embodiment of this application;

[0031] Figure 8a This is a schematic diagram of the structure of the brushless motor rotor in the spray gun of this application; Figure 8b This is a schematic diagram of the structure of the brushless motor rotor in the spray gun of this application. Detailed Implementation

[0032] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0033] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or may be interposed with another element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or may be interposed with another element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementations.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0035] Please see Figure 1-2 , Figure 3a , Figure 3b The first embodiment of this application provides a spray gun 100, which can be used for spraying paint, spraying water (e.g., watering plants), etc. Preferably, the spray gun 100 is a painting device, such as a paint spray gun. The spray gun 100 utilizes the Venturi principle to atomize and spray the paint supplied to the nozzle through a high-speed airflow.

[0036] The spray gun 100 mainly includes a power unit, a working head assembly, a liquid reservoir, and a DC power supply.

[0037] The power assembly includes a first housing 10 and a fan module 20. The fan module 20 is housed within the first housing 10 and is used to generate airflow. Specifically, the fan module 20 includes a brushless motor 202 and a fan 204 driven by the brushless motor 202.

[0038] like Figure 2 As shown, the brushless motor 202 of this embodiment has a rotating shaft 201 and a motor body 203. The motor rotor is mounted on the rotating shaft 201, partially extends out of the motor body 203, and is fitted by the fan 204. Figure 8a , Figure 8b As shown, the motor rotor 205 includes a two-pole magnet or a four-pole magnet fixedly mounted on the rotating shaft 201. The motor body 203 includes a stator, and the lamination thickness of the stator core is 0.2 mm.

[0039] In this embodiment, fan 204 is a centrifugal fan.

[0040] The first housing 10 also has a handle 12 for the operator to grip. Inside the handle 12, there may be a power switch 13 electrically connected to the brushless motor 202. The power switch 13 can cooperate with a switch trigger 38; when the switch trigger 38 is moved inward by the user, it contacts and pushes the power switch 13 to close, thereby starting the spray gun 100. The lower end of the handle 12 also has a mounting portion for connecting a DC power supply. In this embodiment, the DC power supply is a universal power tool battery pack 14.

[0041] In one possible implementation, the handle 12 may also be connected to the first housing 10 in a separable manner.

[0042] The working head assembly includes a sleeve 30, a nozzle assembly 32, and a spray bar assembly 34. The sleeve 30 is connected to the aforementioned first housing 10 and has a cap for connecting a liquid reservoir 36 and a nozzle mounting portion. The nozzle assembly 32 is connected to the sleeve 30 via the nozzle mounting portion and is located at the end of the sleeve 30 furthest from the blower module 20. The nozzle assembly 32 includes a nozzle and a nozzle adjustment component. The nozzle has a liquid outlet, and the nozzle adjustment component is operated by the user to adjust the shape of the liquid to be sprayed. The spray bar assembly 34 is housed inside the sleeve 30 and is configured to move relative to the nozzle assembly 32 along its longitudinal axis X1, thereby opening or closing the liquid outlet.

[0043] The aforementioned switch trigger 38 is pivotally mounted on the sleeve 30. The user controls the movement of the switch trigger 38, thereby driving the spray bar assembly 34 to open the liquid outlet, thereby spraying paint from the spray gun 100.

[0044] In one possible implementation, the sleeve 30 can be directly formed on the first housing 10.

[0045] The reservoir 36 provides the fluid desired to be sprayed by the spray gun 100; for example, the reservoir 36 is filled with paint supplied to the nozzle assembly 32. When the mounting part is connected to the battery pack 14, the end of the battery pack 14 extends in the same plane as the bottom surface of the reservoir 36. Thus, the battery pack 14 and the reservoir 36 together form a support for securely mounting the spray gun 100.

[0046] The power assembly also includes a pressure chamber 16 radially supported within the first housing 10, in which the aforementioned fan module 20 is housed. Furthermore, the pressure chamber 16 and the sleeve 30 are connected by a separable connector, together forming a closed space for airflow. That is, the airflow generated by the fan module 20 is guided by the pressure chamber 16 and completely supplied to the sleeve 30. It should be noted that here, the pressure chamber 16 includes its own housing and the internal space defined by that housing.

[0047] In this embodiment, the air pressure chamber 16 is engaged with the first housing 10.

[0048] An air duct communicating with the air pressure chamber 16 is formed between the inner wall of the sleeve 30 and the outer surface of the spray bar assembly 34. The atomized airflow generated by the fan module 20 forms two gas components as it flows through the air pressure chamber 16, the air duct, and finally to the nozzle assembly 32:

[0049] A portion of the gas is ejected through the nozzle assembly 32, atomizing the sprayed paint using the Venturi principle. At the same time, a negative pressure is created at the mouth of the straw 35, drawing away the air inside the straw 35, thus creating a negative pressure inside the straw 35 connected to the liquid reservoir 36.

[0050] Another portion of the gas enters the reservoir 36 via a connecting structure, thereby creating high pressure above the liquid surface of the reservoir 36. In this way, a gas pressure difference is created inside and outside the suction tube 35, so that the paint is forced out of the reservoir 36 through the suction tube 35 and is finally supplied to the nozzle assembly 32.

[0051] It should be noted that, for reference Figure 1-2 As shown, the "front and back" direction described in this application can be parallel to the airflow direction generated by the fan 204 as a whole. For example, with the nozzle assembly 32 as the front end, the fan module 20 is located behind the nozzle assembly 32.

[0052] like Figure 2 , 3aAs shown in Figure 3b, the fan module 20 of the present invention also includes a fan housing 22, in which the aforementioned brushless motor 202 and fan 204 are housed. The fan housing 22 is provided with an air inlet ring cover 220. Specifically, the air inlet ring cover 220 is located upstream of the brushless motor 202 along the airflow direction, and the aforementioned fan 204 is rotatably supported inside it. The air inlet ring cover 220 is located near the rear end of the air pressure chamber 16, and its rear end has an air guide port 222 embedded in the rear end of the fan 204. When the fan 204 rotates, the airflow enters the fan housing 22 from the air guide port 222 and is driven radially towards the inner wall of the air inlet ring cover 220 by the centrifugal fan 204. The fan housing 22 also forms an air outlet 224, through which the airflow, after passing the brushless motor 202, flows out of the fan housing 22 from the air outlet 224 and enters the air pressure chamber 16.

[0053] The fan module 20 integrates bearing assemblies for supporting the brushless motor 202 and the fan 204. Specifically, the rear end of the fan module 20 has a rear bearing assembly for supporting the brushless motor 202 and the fan 204; the front end of the fan module 20 has a front bearing assembly for supporting the brushless motor 202 and the fan 204. Thus, before the brushless motor 202 and the fan 204 are placed in the air pressure chamber 16, the fan module 20 provides good support for the brushless motor 202 and the fan 204.

[0054] like Figure 2 As shown, the fan module 20 of this embodiment also integrates a circuit board 206 for controlling the operation of the brushless motor 202. The circuit board 206 is fixedly connected to the fan housing 22, housed by the fan housing 22, and located downstream of the brushless motor 202 along the airflow direction.

[0055] Compared to existing technologies that directly support the motor and fan within the air pressure chamber, the components inside the fan module 20 of this invention are fully integrated and centralized, thereby reducing and simplifying assembly processes and lowering assembly costs. Before being installed into the air pressure chamber 16, the fan module 20 can be assembled separately as a single component at the upstream workstation, saving numerous assembly procedures, significantly improving assembly efficiency, and reducing production costs.

[0056] We know that the HVLP paint spray gun 100 atomizes liquids through high-speed airflow, and its working capacity mainly depends on the air volume and air pressure generated by the rotation of the fan 204. The air volume and air pressure are positively correlated with the rotational speed of the fan 204 and the radial dimension of the fan 204.

[0057] In existing technologies, the DC brushed motor used as the drive source has a relatively low rotational speed, while in order to improve the working capacity of the spray gun, the radial dimension of the fan has to be increased. This results in a large tail volume and heavy weight for the spray gun.

[0058] When users hold the spray gun for spraying operations, their thumb and forefinger rest against the upper end of the handle, and their fingers are used to press the switch trigger. When the tail of the spray gun is large, especially when using the spray gun for upward spraying, the user's arm is very likely to interfere with the outer shell of the tail; and the center of gravity of the whole machine is concentrated at the tail, which is also inconvenient for the user to operate.

[0059] Therefore, existing technologies often employ a method of tilting the tail housing, which houses the motor and fan, upwards relative to the sleeve to avoid interference problems. That is, in existing spray guns, the rotation axis of the motor and the longitudinal axis of the spray bar assembly are arranged at an angle.

[0060] In this invention, the spray gun 100 uses a high-speed motor 202 as the driving source. The rated power of the motor 202 is between 250W and 500W, and the motor speed is as high as 60,000rpm to 120,000rpm. Thus, under the same working capacity, the radial dimension of the fan 204 can be reduced. Furthermore, the motor 202 is a brushless motor, which has a higher energy density than a brushed motor. That is, under the same working capacity, the radial dimension of the motor 202 can also be reduced.

[0061] Preferably, the power range of the brushless motor 202 is between 250W and 300W.

[0062] In this embodiment, the outer diameter of the motor body is 32 mm - 45 mm, and the radial dimension of the fan 204 is 38 mm - 55 mm.

[0063] The use of the high-speed brushless motor 202 reduces the structural size of the fan module, thereby reducing the overall weight of the spray gun 100. This means that the load on the user when holding the spray gun 100 is reduced, improving the user experience.

[0064] Furthermore, the overall size of the brushless motor 202 and the fan 204 is greatly reduced, which greatly reduces the overall size of the fan module 20. This improves the installation flexibility of the fan module 20 in the air pressure chamber 16 and makes it possible for the longitudinal axis X1 of the spray bar assembly 34 and the rotation axis X2 of the brushless motor 202 to be parallel or coincident.

[0065] Here, the maximum outer diameter of the fan module 20 is defined as D1. Typically, the outer diameter of the air inlet ring cover 220 corresponding to the axial position of the fan blades of the fan 204 is the maximum outer diameter D1 of the fan module 20.

[0066] like Figure 1-2 , Figure 3a , Figure 3bThe image shows the first embodiment of the present invention. In this embodiment, the maximum outer diameter D1 of the blower module 20 is between 30-45 mm. This small size range makes it possible for the longitudinal axis X1 of the spray bar assembly 34 to coincide with the rotation axis X2 of the brushless motor 202, thus making the structure of the spray gun 100 more compact and the center of gravity closer to the user's hand area, facilitating user operation.

[0067] like Figure 4 The image shows the second embodiment of the present invention. The spray gun 100a provided in this embodiment has the same functional structure as the spray gun 100 provided in the first embodiment, except that the maximum outer diameter of the fan module 20a is larger than the maximum outer diameter of the fan module 20 in the first embodiment, thus the layout of the fan module 20a is different.

[0068] Similar to the first embodiment, the fan module 20a in this embodiment includes: a fan housing 22a, a fan 204a, and a brushless motor 202a. The fan housing 22a is provided with an inlet ring cover 220a and an outlet 224a. When the fan 204a rotates, airflow flows into the fan housing 22a from the inlet ring cover 220a and flows out from the outlet 224a into the air pressure chamber 16a.

[0069] The fan module 20a also integrates front and rear bearing assemblies for supporting the motor shaft; thus, the brushless motor 202a and the fan 204a are well supported before being placed in the air pressure chamber 16a.

[0070] The fan module 20a also integrates a circuit board 206a for controlling the operation of the motor 202a. The circuit board 206a is fixedly connected to the fan housing 22a and is arranged downstream of the brushless motor 202a along the airflow direction. In this way, the components inside the fan module 20a can be fully integrated and concentrated, reducing and simplifying the assembly process and lowering assembly costs.

[0071] In this embodiment, the maximum outer diameter D1 of the fan module 20a is between 45-80mm. If, as in Embodiment 1, the longitudinal axis X1 of the spray bar assembly 34a coincides with the rotation axis X2 of the motor 202a, then when the user holds the handle 12a for spraying, especially during overhead spraying, the lowest point of the first housing 10a is prone to interfering with the user's arm.

[0072] Therefore, in this embodiment, when 45mm < maximum outer diameter D1 ≤ 80mm, the longitudinal axis X1 of the spray bar assembly 34a is arranged parallel to the rotation axis X2 of the motor 202a; and the rotation axis X2 of the brushless motor 202a is set further away from the handle 12a than the longitudinal axis X1 of the spray bar assembly 34a.

[0073] A better design for manipulating the spray gun 100 can be achieved by optimally selecting the ratio of the distance L1 between the longitudinal axis X1 of the spray bar assembly 34 and the rotation axis X2 of the brushless motor 202 to the maximum outer diameter D1 of the fan module 20. Here, the radial dimension of the sleeve 30 housing the spray bar assembly 34 is a conventional size, approximately 30mm-40mm. If the ratio of the distance L1 between the longitudinal axis X1 of the spray bar assembly 34 and the rotation axis X2 of the brushless motor 202 to the maximum outer diameter D1 of the fan module 20 is too large, then the fan module 20 will be positioned further away from the spray bar assembly 34, meaning the center of gravity of the spray gun 100 will be positioned higher. The consequence is that the spray gun 100 will be difficult to manipulate, and the overall structural size will be large. The optimal ratio of the distance L1 between the longitudinal axis X1 of the spray bar assembly 34 and the rotation axis X2 of the brushless motor 202 relative to the maximum outer diameter D1 of the fan module 20 also depends on the range of the maximum outer diameter D1, within which the spray gun 100 is arranged. When 30 ≤ maximum outer diameter D1 ≤ 45 mm, the longitudinal axis X1 of the spray bar assembly 34 coincides with the rotation axis X2 of the brushless motor 202; when 45 < maximum outer diameter D1 ≤ 80 mm, the distance L1 between the longitudinal axis X1 of the spray bar assembly 34 of the spray gun 100 and the rotation axis X2 of the brushless motor 202 satisfies: (D1-45) / 2+2.5 mm ≤ L1 ≤ 20 mm. Here, the maximum distance between the longitudinal axis X1 of the spray bar assembly 34 and the rotation axis X2 of the brushless motor 202 is limited to 20mm. When the distance L1 between the longitudinal axis X1 of the spray bar assembly 34 and the rotation axis X2 of the brushless motor 202 is greater than 20mm, the fan module is set away from the spray bar assembly, that is, the fan module is set away from the sleeve, which makes the overall structure large and the center of gravity high, which is not conducive to operation.

[0074] The distance between the longitudinal axis X1 of the spray bar assembly 34 and the rotation axis X2 of the brushless motor 202 along the direction perpendicular to the longitudinal axis X1 is between 2.5 and 20 mm. Preferably, the distance between the longitudinal axis X1 of the spray bar assembly 34a and the rotation axis X2 along the direction perpendicular to the longitudinal axis X1 is 10 mm.

[0075] In this invention, the maximum outer diameter D1 of the fan module is between 30-80mm, and the maximum outer diameter of the first housing at its tail is between 42mm-92mm.

[0076] Due to the use of a high-speed brushless motor, the fan module of the present invention has a smaller structural size, thereby improving the installation flexibility of the fan module in the air pressure chamber, and ultimately making it possible for the longitudinal axis X1 of the spray bar assembly and the rotation axis X2 of the brushless motor to be parallel or coincident, resulting in a more compact overall layout.

[0077] like Figure 2 As shown, after the gas passes through the air inlet cover 220, it will flow along the inner wall of the air inlet cover 220 towards the front end of the air pressure chamber 16, and the circuit board 206 will form a blockage at the air outlet of the air pressure chamber 16.

[0078] Correspondingly, the smaller the diameter of the circuit board 206 at the air outlet, or the smaller the outer diameter of the fan housing 22 corresponding to the axial position of the circuit board 206, the smaller the resistance encountered by the airflow driven by the fan 204, and the wind resistance and loss are reduced accordingly.

[0079] Based on this consideration, the circuit board 206 is fixedly connected to the downstream of the motor body 203 along the airflow direction.

[0080] Here, the outer diameter of the fan housing 22 corresponding to the axial position of the circuit board 206 is defined as D2. Where D1 is not less than D2. Specifically, the value of D2 ranges from 40mm to 55mm.

[0081] Furthermore, to reduce wind resistance, the smaller the diameter of the circuit board 206, the better; the circuit board 206 preferably has a diameter of 40mm.

[0082] In this invention, the brushless motor has a speed of up to 60,000-120,000 rpm, which causes the fan module to vibrate significantly when the spray gun is performing spraying operations, affecting the user's grip comfort.

[0083] Therefore, the present invention utilizes a shock-absorbing structure to suspend the fan module in the first housing or air pressure chamber to attenuate the vibration generated by the fan module during high-speed rotation and reduce the vibration felt by the user when holding the spraying equipment.

[0084] Preferably, the shock-absorbing structure is a cushioning material, which can be a spring material, a sponge material, etc. More preferably, the shock-absorbing structure is made of rubber, especially polyurethane rubber.

[0085] like Figure 2 , Figure 4 As shown, the first and second embodiments of the present invention employ the same shock-absorbing structure, including a first shock absorber 8 and a second shock absorber 7 arranged along the airflow direction.

[0086] The following description uses the first embodiment as an example to illustrate the shock-absorbing structure. Figure 2 As shown in Figure 3, the first damping member 8 is disposed near the front end of the fan module 20, and the second damping member 7 is disposed near the rear end of the fan module 20; the fan module 20 is located axially between the first damping member 8 and the second damping member 7. The first damping member 8 and the second damping member 7 clamp the fan module 20 axially, thereby limiting the front and rear axial movement of the fan module 20, and the first damping member 8 or the second damping member 7 is used to loop around the fan module 20 to provide radial support and limit the movement of the fan module 20, thus buffering and attenuating vibrations in both the axial and radial directions.

[0087] Specifically, the fan module 20 is supported within the air pressure chamber 16 by a shock-absorbing structure. In this embodiment, the air pressure chamber 16 can be fixedly installed within the first housing 10.

[0088] Of course, this application does not limit the wind pressure chamber 16 to also adopt a damping structure (such as the damping structure in the following embodiments) in the first housing 10 to form a secondary damping.

[0089] To dampen the front end of the fan module 20, a mounting portion is provided in the air pressure chamber 16 downstream of the fan module 20 along the airflow direction. The first damping member 8 is axially sandwiched between the fan housing 22 and the mounting portion. The second damping member 7 is looped between the air inlet ring cover 220 and the air pressure chamber 16.

[0090] Specifically, such as Figure 2 As shown, the air pressure chamber 16 has a front air pressure shell 6 and a rear air pressure shell 5. The front end of the front air pressure shell 6 is fitted and fixed to the sleeve 30. The mounting part can be constructed as an air passage plate 9 provided at the front end of the air pressure chamber 16, which has ventilation holes. The air passage plate 9 and the circuit board 206 are axially opposite. The end face of the rear air pressure shell 5 is provided with an air inlet mesh. A filter screen 4 is arranged between the rear side of the rear air pressure shell 5 and the rear cover 3 of the first housing. After the external airflow flows through the rear cover 3 of the first housing and the sound-absorbing surface 4, it enters the fan housing 22 through the air inlet mesh of the rear air pressure shell 5.

[0091] The fan housing 22 has a first groove on the side facing the mounting portion 9. The mounting portion 9 has a second groove on the side facing the circuit board 206. The first shock absorber 8 is inserted into the first groove and the second groove at both ends along the axial direction, respectively; the first shock absorber 8 is clamped between the mounting portion 9 and the fan housing 22. The first shock absorber 8 and the second shock absorber 7 cooperate to clamp the fan module 20 axially.

[0092] The second shock absorber 7 can be a rubber ring sleeve that fits around the fan module 20. The air inlet cover 220 is fixedly sleeved inside the second shock absorber 7 and is fixedly connected to the motor body 203 of the fan module 20. An air guide structure 225 can be provided on the front side of the air inlet cover 220. The air guide structure 225 is fixedly sleeved around the motor body 203. The air guide structure 225 has air guide holes along the circumferential direction to guide the airflow generated by the rotation of the fan 204 and reduce the air resistance in the fan housing 22.

[0093] The second damping component 7 is fitted inside the rear air compressor housing 5, filling the space between the rear air compressor housing 5 and the air inlet ring cover 220. The rear wall of the air inlet ring cover 220 forms a front axial limiting platform, and the rear air compressor housing 5 is narrowed inward to form a rear axial limiting platform. At least part of the second damping component 7 is located between the front axial limiting platform and the rear axial limiting platform.

[0094] like Figure 2 As shown, the longitudinal section of the second damping component 7 of the ring structure is generally L-shaped. In this way, the second damping component 7 provides axial restraint and radial support for the fan module 20.

[0095] The longitudinal section of the first damping component 8 is generally in the shape of a cross. The first damping component 8 can be a three-cylinder structure, with the outer diameter of the middle cylindrical section being larger than the outer diameter of the front and rear cylindrical sections. The front cylindrical section is inserted into the first groove with an interference fit, and the rear cylindrical section is inserted into the second groove with an interference fit.

[0096] like Figure 5 The image shows a spray gun 100b according to the third embodiment of the present invention. In this embodiment, the first shock absorber 8b can also be sleeved between the fan housing 22b and the air pressure chamber 16b. The fan housing 22b has an outer annular groove on its outer circumferential side wall, and the first shock absorber 8b can be sleeved and embedded in this outer annular groove. Correspondingly, the air pressure chamber 16b also has an inner annular groove at the corresponding position in the axial direction, and the first shock absorber 8b is also embedded in this inner annular groove, thus achieving axial positioning of the first shock absorber 8b and the fan module 20b. The first shock absorber 8b has a through hole in the axial direction for airflow to pass through. Multiple through holes are evenly distributed in the circumferential direction on the first shock absorber 8b, thereby forming a uniform airflow in the circumferential direction.

[0097] The second damping component 7b in this embodiment can be referred to as the second damping component 7 in the above embodiment, and will not be described again in this embodiment.

[0098] like Figure 6The image shows a spray gun 100c according to the fourth embodiment of the present invention. In this embodiment, the blower housing 22c is fixedly connected to the air pressure chamber 16c, and the air pressure chamber 16c is installed in the first housing 10c through a shock-absorbing structure. Therefore, the vibration generated by the blower module 20c is transmitted to the air pressure chamber 16c first, and then attenuated by the shock-absorbing structure before being transmitted to the first housing 10c. As a result, the vibration experienced by the first housing 10c is weaker, improving the user's grip and operation experience.

[0099] Of course, in this embodiment, the fan module 20c can also adopt the solution of the above embodiment, that is, the fan module 20c is installed in the wind pressure chamber 16c through the shock absorption structure to form a secondary shock absorption. This application does not limit this.

[0100] In this embodiment, the first shock absorber 8c and the second shock absorber 7c are fixedly fitted onto the outer wall of the wind pressure chamber 16c. The first shock absorber 8c and the second shock absorber 7c are respectively positioned near the front end (e.g., circuit board 206c) and the rear end (e.g., air inlet ring cover 220c) of the fan module 20c. The outer wall of the wind pressure chamber 16c has a front groove (not shown) and a rear groove (not shown), and the first shock absorber 8c and the second shock absorber 7c are rubber rings embedded in the front groove and the rear groove, respectively. The front groove and the rear groove respectively provide axial restraint for the first shock absorber 8c and the second shock absorber 7c, preventing axial displacement during rotation. The first shock absorber 8c and the second shock absorber 7c partially protrude from their respective grooves and contact the inner wall of the first housing 10c, forming a buffer for shock absorption.

[0101] like Figure 7 The image shows a spray gun 100d according to the fifth embodiment of the present invention. In this embodiment, the blower housing 22d is fixedly connected to the air pressure chamber 16d, and the air pressure chamber 16d is installed in the first housing 10d through a shock-absorbing structure. Furthermore, the circuit board 206d for controlling the operation of the motor 202d is located inside the handle 12d, rather than in the air pressure chamber 16d.

[0102] Of course, in this embodiment, the fan module 20d can also be supported in the wind pressure chamber 16d by a shock absorption mechanism, and this application does not limit this.

[0103] Any numerical values ​​cited herein include all values ​​ranging from a lower limit to an upper limit, increasing by one unit, with at least two units between any lower and any higher value. For example, if the quantity of a component or the value of a process variable (e.g., temperature, pressure, time, etc.) is described as being from 1 to 90, preferably from 20 to 80, more preferably from 30 to 70, the purpose is to illustrate that values ​​such as 15 to 85, 22 to 68, 43 to 51, 30 to 32 are also explicitly listed in this specification. For values ​​less than 1, a unit is appropriately considered to be 0.0001, 0.001, 0.01, 0.1, etc. These are merely examples intended for explicit expression, and it can be assumed that all possible combinations of values ​​listed between the minimum and maximum values ​​are explicitly described in this specification in a similar manner.

[0104] Unless otherwise stated, all ranges include the endpoints and all numbers between them. The terms "approximately" or "about" used with ranges apply to both endpoints of the range. Thus, "approximately 20 to 30" is intended to cover "approximately 20 to approximately 30," including at least the specified endpoints.

[0105] All articles and references disclosed herein, including patent applications and publications, are incorporated herein by reference for various purposes. The term “substantially constitutes…” used to describe a combination should include the identified elements, components, parts, or steps, as well as other elements, components, parts, or steps that do not substantially affect the essential novelty of the combination. The use of the terms “comprising” or “including” to describe combinations of elements, components, parts, or steps herein also contemplates embodiments substantially constituted by such elements, components, parts, or steps. The use of the term “may” herein is intended to indicate that any described attribute included by “may” is optional.

[0106] Multiple elements, components, parts, or steps can be provided by a single integrated element, component, part, or step. Alternatively, a single integrated element, component, part, or step can be divided into multiple separate elements, components, parts, or steps. The use of "a" or "an" to describe an element, component, part, or step does not imply the exclusion of other elements, components, parts, or steps.

[0107] It should be understood that the above description is for illustrative purposes and not for limitation. Many embodiments and applications beyond the provided examples will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of this teaching should not be determined by reference to the above description, but rather by reference to the appended claims and the full scope of their equivalents. For purposes of completeness, all articles and references, including patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the preceding claims is not intended as a waiver of that subject matter, nor should it be construed as an indication that the inventors have not considered that subject matter as part of the disclosed inventive subject matter.

Claims

1. A spray gun that atomizes liquid using airflow, comprising: First shell; A fan module, housed within the first housing, is used to generate airflow; The fan module includes a brushless motor and a fan driven by the brushless motor. A sleeve, formed or mounted on the first housing; A nozzle assembly is disposed at one end of the sleeve away from the fan module, the nozzle assembly having a liquid outlet; A spray bar assembly is housed within the sleeve; the spray bar assembly is configured to move along its longitudinal axis to open or close the liquid outlet. The brushless motor is characterized in that its rated power is between 250W and 500W, its speed range is between 60,000 rpm and 120,000 rpm, and the rotation axis of the brushless motor is parallel to or coincides with the longitudinal axis of the spray bar assembly.

2. The spray gun as described in claim 1, characterized in that, The maximum outer diameter of the fan module is defined as D1. When 30mm ≤ maximum outer diameter D1 ≤ 45mm, the rotation axis of the brushless motor is set to coincide with the longitudinal axis of the spray bar assembly.

3. The spray gun as described in claim 1, characterized in that, The maximum outer diameter of the fan module is defined as D1. When 45 mm < maximum outer diameter D1 ≤ 80 mm, the rotation axis of the brushless motor is set parallel to the longitudinal axis of the spray bar assembly, and the distance L1 between them satisfies: (D1-45) / 2+2.5mm≤L1≤20mm.

4. The spray gun as described in claim 3, characterized in that, The spray gun includes a handle for the operator to hold, and the axis of rotation of the brushless motor is further away from the handle than the longitudinal axis of the spray bar assembly in a direction perpendicular to the longitudinal axis.

5. The spray gun as described in claim 1, characterized in that, The spray gun also includes a wind pressure chamber radially supported within the first housing, and the fan module is housed within the wind pressure chamber.

6. The spray gun as described in claim 5, characterized in that, The fan module also includes a fan housing. Along the direction of airflow, the fan and the brushless motor are arranged sequentially inside the fan housing. The fan housing is provided with an air inlet ring cover and an air outlet. When the fan rotates, the airflow enters the fan housing from the air inlet ring cover and flows out from the air outlet to the air pressure chamber.

7. The spray gun as described in claim 6, characterized in that, The fan is rotatably mounted inside the air inlet ring cover, and the outer diameter of the air inlet ring cover corresponding to the position of the fan blades on the axis is the maximum outer diameter D1 of the fan module.

8. The spray gun as described in claim 6, characterized in that, The fan module also includes a circuit board for controlling the operation of the brushless motor. The circuit board is fixedly connected to the fan housing and is arranged downstream of the brushless motor along the airflow direction.

9. The spray gun as described in claim 8, characterized in that, The outer diameter of the fan housing corresponding to the axial position of the circuit board is D2, where D2≤D1.

10. The spray gun as described in claim 9, characterized in that, The D2 size ranges from 40mm to 55mm.

11. The spray gun as described in claim 6, characterized in that, The fan module is supported in the air pressure chamber by a shock-absorbing structure.

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