spray gun

Abstract

The present invention provides a spray gun, which includes: a body; a pneumatic chamber, the pneumatic chamber having an air inlet and an air outlet; a fan module, which is accommodated in the pneumatic chamber, the fan module having an air intake side, an exhaust side, and an air flow channel, the air intake side being arranged near the air intake, the exhaust side being arranged near the air outlet, the air flow channel supplying gas to flow from the air intake side to the exhaust side, the fan module including a fan and a motor, and the fan being arranged near the air intake side; wherein, the maximum inner diameter of the pneumatic chamber corresponding to the middle position of the air flow channel is A1, the maximum inner diameter of the pneumatic chamber between the exhaust side and the air outlet is A2, the longitudinal cross-section position of the air outlet of the pneumatic chamber is A3, and the inner diameter value of A2 is ≥ the inner diameter value of A1> the inner diameter value of A3. The technical solution provided by the present application can solve the problems of low air pressure in the pneumatic chamber and long air intake time in the spray gun of the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of spray guns, in particular to a spray gun. Background Art

[0002] like Figure 1 and Figure 2 As shown, the existing spray gun includes a body 1', a blower module, a nozzle 3', a paint container box 4' and a grip 5'. The body 1' has an air pressure chamber 13', and the two ends of the air pressure chamber 13' have an air inlet 11' and an air outlet 12'. Figure 1 As shown, in the prior art, fan modules often use low-speed motors, with speeds below 60,000 rpm. To meet the performance requirements of HVLP paint spray guns, fan modules use centrifugal fans with a linear diameter greater than 80 mm. As a result, the radial dimension of the air pressure chamber is larger near the rear end of the fan and smaller at the front.

[0003] As motors develop towards higher speeds, fan modules tend to develop towards high-speed and miniaturized fans, such as Figure 2 As shown in the figure, without affecting the performance of the fan module, the speed is increased, which reduces the linear diameter and volume of the fan.

[0004] from Figures 1 to 2 It can be seen from the figure that if the fan module using high-speed motor continues to use Figure 1 The illustrated air pressure chamber structure, while reducing the size of the fan module, leaves the structural dimensions of the two air pressure chambers unchanged, resulting in a significant amount of redundant space within the air pressure chambers. Given the same suction volume, the air pressure within the air pressure chambers is relatively low, requiring increased suction time to reach the desired pressure. Consequently, existing spray guns suffer from low air pressure in the air pressure chambers and long suction times. Summary of the Invention

[0005] The invention provides a spray gun to solve the problems of low air pressure in an air pressure chamber and long air suction time in the spray gun in the prior art.

[0006] The present invention provides a spray gun, which includes: a body; an air pressure chamber, the air pressure chamber having an air inlet and an air outlet; a fan module, which is accommodated in the air pressure chamber, the fan module having an air intake side, an exhaust side and an air flow channel, the air intake side is arranged close to the air intake, the exhaust side is arranged close to the air outlet, the air flow channel supplies gas from the air intake side to the exhaust side, the fan module includes a fan and a motor, and the fan is arranged close to the air intake side; wherein, the maximum inner diameter of the air pressure chamber at the middle position of the corresponding air flow channel is A1, the maximum inner diameter of the air pressure chamber between the exhaust side and the air outlet is A2, the longitudinal cross-section position of the air pressure chamber where the air outlet is located is A3, and the inner diameter value of A2 is ≥ the inner diameter value of A1> the inner diameter value of A3.

[0007] In one embodiment, the longitudinal cross-sectional position of the air inlet of the air pressure chamber is A4, and the ventilation area corresponding to the air pressure chamber at A4 is S4, and the value range of S4 is 350mm. 2 Up to 800mm 2 between.

[0008] In one embodiment, the ratio of the motor input power to S4 is between 0.25 and 1.15.

[0009] In one embodiment, the ventilation area of the air pressure chamber at position A1 is S1, S1 / S4≥1.5, and the value range of S1 is 525mm 2 Up to 1200mm 2 between.

[0010] In one embodiment, the ventilation area of the air pressure chamber at A2 is S2, S2 / S4≥1.2, and the value range of S2 is 420mm 2 Up to 1000mm 2 between.

[0011] In one embodiment, the ventilation area of the air pressure chamber at position A3 is S3, S3 / S4≥1, and the value range of S3 is 350mm 2 Up to 800mm 2 between.

[0012] In one embodiment, the value range of S4 is 450 mm. 2 Up to 480mm 2 between.

[0013] In one embodiment, the value range of S1 is 1100 mm. 2 Up to 1200mm 2 between.

[0014] In one embodiment, the value range of S2 is 750 mm. 2 Up to 850mm 2 between.

[0015] In one embodiment, the value range of S3 is 675 mm. 2 Up to 720mm 2 between.

[0016] In one embodiment, the ventilation area corresponding to the air pressure chamber at A1 is S1, the ventilation area corresponding to the air pressure chamber at A2 is S2, and the ventilation area corresponding to the air pressure chamber at A3 is S3, S1>S2>S3>S4.

[0017] In one embodiment, the fan module further includes a control board, which is electrically connected to the motor. The control board is disposed in the air pressure chamber and is located on a side of the motor close to the air outlet.

[0018] In one embodiment, the inner diameter value of A2 is greater than the inner diameter value of A1 and greater than the inner diameter value of A3.

[0019] In one embodiment, the fan module further includes a control panel electrically connected to the motor, the spray gun further includes a grip connected to the body, and the control panel is disposed in the grip.

[0020] In one embodiment, the inner diameter value of A2 = the inner diameter value of A1 > the inner diameter value of A3.

[0021] In one embodiment, the spray gun further includes a vibration damper, which is disposed at both ends of the fan module, and the fan module is supported in the air pressure chamber by the vibration damper.

[0022] In one embodiment, the inner diameter of A1 is between 48 mm and 78 mm.

[0023] In one embodiment, the inner diameter of A2 is between 56 mm and 86 mm.

[0024] In one embodiment, the inner diameter of A3 is greater than or equal to 30 mm.

[0025] Applying the technical solution of the present invention, the spray gun includes a fuselage and a fan module. The fan is arranged near the air intake side, and when designing the air pressure chamber, the maximum inner diameter of the middle position of the corresponding air flow channel of the air pressure chamber is A1, the maximum inner diameter of the air pressure chamber between the exhaust side and the air outlet is A2, the longitudinal cross-sectional position of the air outlet of the air pressure chamber is A3, and the inner diameter value of A2 is ≥ the inner diameter value of A1 > the inner diameter value of A3. In this way, the radial dimension of the middle and rear part of the fan module corresponding to the air pressure chamber can be reduced, and the redundant space at this point in the existing design can be reduced, so that the fan module can quickly increase the air pressure of the air pressure chamber when working and reduce the suction time. By optimizing the design of the air pressure chamber, the problems caused by the unreasonable design of the air pressure chamber in the prior art can be solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0027] Figure 1 Shows a schematic structural diagram of a spray gun provided by the prior art;

[0028] Figure 2Shows a schematic structural diagram of a spray gun provided by the prior art;

[0029] Figure 3 It shows a schematic structural diagram of a spray gun provided according to the first embodiment of the present invention;

[0030] Figure 4 It shows a schematic structural diagram of a spray gun provided according to a second embodiment of the present invention;

[0031] Figure 5a Shown Figure 3 A cross-sectional view at A1, wherein the fuselage shell is not shown;

[0032] Figure 5b-1 Shown Figure 3 A sectional view at A2, wherein the fuselage shell is not shown;

[0033] Figure 5b-2 Shown Figure 4 A sectional view at A2, wherein the fuselage shell is not shown;

[0034] Figure 5c Shown Figure 3 A sectional view at A3, wherein the fuselage shell is not shown;

[0035] Figure 5d Shown Figure 3 A cross-sectional view at A4 in the figure, wherein the fuselage shell is not shown.

[0036] The above drawings include the following reference numerals:

[0037] 10. Body; 11. Air inlet; 12. Air outlet; 13. Air pressure chamber; 13a. Chamber front shell; 13b. Chamber rear shell;

[0038] 20. Fan module; 21. Fan; 22. Motor; 23. Control board; 201. Intake side; 202. Exhaust side; 203. Airflow channel;

[0039] 30. Nozzle; 40. Paint container box; 50. Grip; 60. Vibration damper. DETAILED DESCRIPTION

[0040] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0041] like Figure 3 As shown, a first embodiment of the present invention provides a spray gun, which includes a body 10 and a fan module 20. The body 10 contains an air pressure chamber 13. The air pressure chamber 13 has an air inlet 11 and an air outlet. Air is sucked into the middle of the air pressure chamber 13 through the air inlet 11, and the air in the air pressure chamber 13 is sent into the nozzle 30 through the air outlet 12. The fan module 20 is contained in the air pressure chamber 13, and the fan module 20 includes a fan 21 and a motor 22. The fan 21 and the motor 22 are both arranged in the air pressure chamber 13, the fan 21 is arranged close to the air inlet 11, and the motor 22 is arranged close to the air outlet 12. The fan module 20 has an intake side 201, an exhaust side 202, and an airflow channel 203. The intake side 201 is located near the air inlet 11, and the exhaust side 202 is located near the air outlet 12. The airflow channel 203 allows air to flow from the intake side 201 to the exhaust side 202. Specifically, during operation of the spray gun, the motor 22 drives the fan 21 to rotate, so that air enters the intake side 201, the airflow channel 203, the exhaust side 202, and finally enters the spray head 30 through the air outlet 12.

[0042] In this embodiment, the air pressure chamber 13 is used to accommodate the blower module 20 and absorb and compress air to deliver it to the spray gun's nozzle and the paint container box 40. The air pressure chamber 13 is housed within the body 10 and has its own housing. The maximum inner diameter of the air pressure chamber 13, corresponding to the middle portion of the air flow channel 203, is A1. The maximum inner diameter of the air pressure chamber 13 between the exhaust side 202 and the air outlet 12 is A2. The longitudinal cross-sectional location of the air pressure chamber 13 where the air outlet 12 is located is A3. The inner diameter of A2 is ≥ the inner diameter of A1 and > the inner diameter of A3.

[0043] The above design reduces the inner diameter of the portion of the air pressure chamber 13 corresponding to the center of the blower module 20, thereby reducing unnecessary space within the air pressure chamber 13. With the same air intake volume, the air pressure in the air pressure chamber 13 designed in this application increases at a faster rate, and the time required to reach the preset pressure is shortened. Furthermore, by reducing the inner diameter of the portion of the air pressure chamber 13 corresponding to the center of the blower module 20, the overall size of the spray gun can be further reduced, making it easier for the user to operate.

[0044] Specifically, the inner diameter of A1 is between 48 mm and 78 mm, the inner diameter of A2 is between 56 mm and 86 mm, and the inner diameter of A3 is greater than or equal to 30 mm.

[0045] In this embodiment, the inner diameter of A1 is 63 mm, the inner diameter of A2 is 71 mm, and the inner diameter of A3 is 35 mm. Under these parameters, the air pressure chamber 13 can minimize redundant space while ensuring normal ventilation.

[0046] In this embodiment, the inner diameter of A2 is designed to be larger than the inner diameter of A1. This design can buffer the gas flowing out from the exhaust side 202 and reduce the turbulence caused by the gas being reflected back by the inner wall of the chamber.

[0047] With the spray gun provided in this embodiment, the fan 21 is arranged near the air inlet 11, and the motor 22 is arranged near the air outlet 12. When designing the air pressure chamber 13, the maximum inner diameter of the middle position of the corresponding air flow channel 203 of the air pressure chamber 13 is A1, the maximum inner diameter of the air pressure chamber 13 between the exhaust side 202 and the air outlet 12 is A2, and the position of the air outlet 12 of the air pressure chamber 13 is A3, and the inner diameter value of A2 is ≥ the inner diameter value of A1 > the inner diameter value of A3. In this way, the radial dimension of the middle and rear part of the blower module 20 corresponding to the air pressure chamber 13 can be reduced, and the redundant space at this point in the existing design can be reduced, so that the blower module can quickly increase the air pressure of the air pressure chamber when working and reduce the suction time. By optimizing the design of the air pressure chamber, the problems caused by the unreasonable design of the air pressure chamber in the existing technology can be solved. In addition, the body volume can be reduced, which is convenient for users to use.

[0048] Specifically, the fan module 20 adopts a miniaturized fan module driven by a high-speed brushless motor, the diameter of the fan 21 is 38-45mm, and the input power of the fan is 200W-400W. This parameter can not only meet the suction demand, but also reduce the occupied volume of the fan module. The longitudinal cross-sectional position of the air inlet 11 of the air pressure chamber 13 is A4, and the ventilation area corresponding to the air pressure chamber 13 at A4 is S4, and the value range of S4 is 350mm. 2 Up to 800mm 2 The ventilation area of S4 is too small to allow the fan module 20 to absorb air. Based on the requirements of spray gun painting, S4 is set at 350mm. 2 Up to 800mm 2 The air suction volume can be guaranteed while reducing redundant space. In this embodiment, the value range of S4 is 450mm 2 Up to 480mm 2 Between. Combine Figure 3 and Figure 5d As shown, the ventilation area of S4 is Figure 5d The sum of the areas of all the through holes in the .

[0049] Furthermore, the ratio of the input power of the motor 22 to S4 is between 0.25 and 1.15. If the input power of the motor 22 is too small, its performance cannot meet the requirements of paint spraying. If the input power of the motor 22 is too large, it will cause power waste. By limiting the ratio of the input power of the motor 22 to S4, the design and selection of S4 and the motor 22 can be reasonable, while meeting the requirements of paint spraying, the power waste can be reduced as much as possible, so that the spray gun can achieve a good air suction effect. In this embodiment, the diameter of the fan 21 is 45mm, the ratio of the input power of the motor 22 to S4 is 0.66, the input power selected for the motor 22 is 300W, and the ventilation area of S4 is 450mm 2 .

[0050] Among them, the ventilation area corresponding to the air pressure chamber 13 at A1 is S1, the ventilation area corresponding to A2 is S2, and the ventilation area corresponding to A3 is S3, which need to be designed accordingly. If the above ventilation area values are too small, it will cause resistance to air suction and affect the air suction of the fan module 20. If the above ventilation area values are too large, it will cause space redundancy.

[0051] Specifically, S1 / S4≥1.5, S1 value range is 525mm 2 Up to 1200mm 2 In this way, the ventilation area of the air pressure chamber 13 at A1 can be matched with the ventilation area at the air inlet to ensure effective work when the gas is inhaled. In this embodiment, S1 / S4=2.5, and S1 is 1100mm 2 Up to 1200mm 2 Between. Combine Figure 3 and Figure 5a As shown, S1 is the ventilation area corresponding to A1, and the maximum inner diameter value of the middle position of the corresponding air flow channel 203 of the air pressure chamber 13 is d1.

[0052] Specifically, S2 / S4≥1.2, S2 value range is 420mm 2 Up to 1000mm 2 In this way, the ventilation area of the air pressure chamber 13 at A2 can be matched with the ventilation area at the air inlet to ensure effective work when the gas is inhaled. In this embodiment, S2 / S4=1.7, and S2 is 750mm 2 Up to 850mm 2 Between. Combine Figure 3 and Figure 5b-1 As shown, S2 is the ventilation area corresponding to A2, and the maximum inner diameter of the air pressure chamber 13 between the exhaust side 202 and the air outlet 12 is d2.

[0053] Specifically, S3 / S4≥1, and the value range of S3 is 350mm 2Up to 800mm 2 In this way, the ventilation area of the air pressure chamber 13 at A3 can be matched with the ventilation area at the air inlet to ensure effective work when the gas is inhaled. In this embodiment, S3 / S4=1.5, and S3 is 675mm 2 Up to 720mm 2 Between. Combine Figure 3 and Figure 5c As shown, S3 is the ventilation area corresponding to A3, and the inner diameter of the air pressure chamber 13 at the air outlet 12 is d3.

[0054] Specifically, in this embodiment, S1>S2>S3>S4. By limiting and coordinating the ventilation areas, the loss of air drawn into the fan module 20 can be greatly reduced, thereby avoiding problems such as poor air flow and heating caused by wind resistance. Furthermore, the power requirement for the motor 22 can be reduced, significantly improving the performance of the spray gun.

[0055] In this embodiment, the spray gun further includes a spray head 30 and a paint container box 40. The spray head 30 is connected to the body 10, and the paint container box 40 is connected to the spray head 30. The paint container box 40 is used to hold paint. The spray head 30 uses the wind force generated by the fan module 20 to absorb the paint and atomize the paint at the nozzle of the spray head 30.

[0056] The fan module 20 also includes a control board 23, which is electrically connected to the motor 22 and is used to control the operation of the motor 22. In this embodiment, the control board 23 is disposed within the air pressure chamber 13 and is located on the side of the motor 22 near the air outlet 12. This arrangement allows the airflow from the air outlet 12 to cool the control board 23, reducing the possibility of damage to the control board 23 due to high temperatures. Furthermore, in this embodiment, the inner diameter of A2 is designed to be larger than the inner diameter of A1, providing sufficient space for the control board 23 and reducing turbulence caused by the narrow exhaust side 202.

[0057] like Figure 3 As shown, the spray gun further includes a vibration damper 60, which is provided at both ends of the fan module 20. The fan module 20 is supported in the air pressure chamber 13 by the vibration damper 60. The vibration damper 60 can be made of shock-absorbing rubber to reduce the vibration generated by the fan module 20 during operation and improve the structural stability.

[0058] Specifically, in this embodiment, a front chamber shell 13a and a rear chamber shell 13b are disposed within the body 10. The front chamber shell 13a and the rear chamber shell 13b are detachably connected and together constitute the air pressure chamber 13. This structure facilitates installation, production, and manufacturing, making the air pressure chamber 13 more flexible in design.

[0059] In this embodiment, the spray gun further includes a gripping portion 50 , which is connected to the body 10 .

[0060] like Figure 4 and Figure 5b-2 As shown, the second embodiment of the present invention provides a spray gun. The difference between the second embodiment and the first embodiment is that the control panel 23 is arranged in the gripping portion 50, and the inner diameter value of A2 = the inner diameter value of A1 > the inner diameter value of A3. Figure 5b-2 In the figure, S2 is the total area of the multiple ventilation holes corresponding to position A2, and the maximum inner diameter of the air pressure chamber 13 between the exhaust side 202 and the air outlet 12 is d2. This structure further reduces redundant space in the air pressure chamber, further improving the suction efficiency of the fan module 20 and reducing suction time. Placing the control panel 23 within the grip 50 fully utilizes the device space and makes the structural layout more rational and compact.

[0061] The spray gun provided in this embodiment can minimize the redundant space of the air pressure chamber, improve the air suction efficiency of the fan module, and enhance the spray performance of the spray gun. It can also further miniaturize the device and improve user comfort.

[0062] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0063] Unless otherwise specifically stated, the relative arrangement of the parts and steps, the numerical expressions and the numerical values set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values should be interpreted as being merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0064] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0065] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0066] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0067] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A spray gun, characterized in that: The spray gun comprises: fuselage (10); a pneumatic chamber (13), the pneumatic chamber having an air inlet (11) and an air outlet (12); A fan module (20) is housed in the air pressure chamber (13), the fan module (20) having an air intake side (201), an air exhaust side (202), and an air flow channel (203), the air intake side (201) being arranged close to the air inlet (11), the air exhaust side (202) being arranged close to the air outlet (12), the air flow channel (203) allowing air to flow from the air intake side (201) to the air exhaust side (202), the fan module (20) comprising a fan (21) and a motor (22), the fan (21) being arranged close to the air intake side (201); The maximum inner diameter of the air pressure chamber (13) corresponding to the middle position of the air flow channel (203) is A1, the maximum inner diameter of the air pressure chamber (13) between the exhaust side (202) and the air outlet (12) is A2, the longitudinal cross-sectional position of the air outlet (12) of the air pressure chamber (13) is A3, and the inner diameter value of A2 is ≥ the inner diameter value of A1 and is greater than the inner diameter value of A3.

2. The spray gun according to claim 1, characterized in that The longitudinal cross-sectional position of the air inlet (11) of the air pressure chamber (13) is A4, and the ventilation area corresponding to the air pressure chamber (13) at A4 is S4, and the value range of S4 is 350mm 2 Up to 800mm 2 between.

3. The spray gun according to claim 2, characterized in that The ratio of the input power of the motor (22) to S4 is between 0.25 and 1.

15.

4. The spray gun according to claim 2, characterized in that The ventilation area corresponding to the air pressure chamber (13) at position A1 is S1, S1 / S4≥1.5, and the value range of S1 is 525mm 2 Up to 1200mm 2 between.

5. The spray gun according to claim 2, characterized in that The ventilation area corresponding to the air pressure chamber (13) at position A2 is S2, S2 / S4≥1.2, and the value range of S2 is 420mm 2 Up to 1000mm 2 between.

6. The spray gun according to claim 2, characterized in that The ventilation area corresponding to the air pressure chamber (13) at position A3 is S3, S3 / S4≥1, and the value range of S3 is 350mm 2 Up to 800mm 2 between.

7. The spray gun according to claim 2, characterized in that The value range of S4 is 450mm 2 Up to 480mm 2 between.

8. The spray gun according to claim 4, characterized in that The value range of S1 is 1100mm 2 Up to 1200mm 2 between.

9. The spray gun according to claim 5, characterized in that The value range of S2 is 750mm 2 Up to 850mm 2 between.

10. The spray gun according to claim 6, characterized in that The value range of S3 is 675mm 2 Up to 720mm 2 between.

11. The spray gun according to claim 2, characterized in that The ventilation area corresponding to the air pressure chamber (13) at A1 is S1, the ventilation area corresponding to the air pressure chamber (13) at A2 is S2, and the ventilation area corresponding to the air pressure chamber (13) at A3 is S3, S1>S2>S3>S4.

12. The spray gun according to claim 1, wherein The fan module (20) further includes a control panel (23), the control panel (23) being electrically connected to the motor (22), and the control panel (23) being disposed in the air pressure chamber (13) and located on a side of the motor (22) close to the air outlet (12).

13. The spray gun according to claim 12, characterized in that The inner diameter value of A2>the inner diameter value of A1>the inner diameter value of A3.

14. The spray gun according to claim 1, wherein The fan module (20) further includes a control panel (23), the control panel (23) being electrically connected to the motor (22), and the spray gun further includes a gripping portion (50), the gripping portion (50) being connected to the body (10), and the control panel (23) being disposed within the gripping portion (50).

15. The spray gun according to claim 14, characterized in that The inner diameter value of A2 = the inner diameter value of A1 > the inner diameter value of A3.

16. The spray gun according to claim 1, wherein The spray gun further comprises a vibration damping member (60), wherein the vibration damping member (60) is arranged at both ends of the fan module (20), and the fan module (20) is supported in the air pressure chamber (13) through the vibration damping member (60).

17. The spray gun according to claim 1, wherein The inner diameter of A1 is between 48mm and 78mm.

18. The spray gun according to claim 1, wherein The inner diameter of A2 is between 56mm and 86mm.

19. The spray gun according to claim 1, wherein The inner diameter of A3 is greater than or equal to 30mm.

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