Spray gun with air volume adjusting structure
By introducing an air volume adjustment structure into the spray gun and precisely adjusting the air volume by using gears and ring gears to accurately control the air volume, the problem that existing spray guns cannot accurately control the air inlet volume is solved, and the uniform stability of the spraying effect is achieved.
Patent Information
- Application Number
- CN202422193255.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-07
- Publication Date
- 2025-08-15
- Estimated Expiration
- 2034-09-07
AI Technical Summary
When adjusting the spray web, existing spray guns cannot accurately control the air inlet volume at the side air inlet, resulting in uneven and unsatisfactory spraying effect.
The air volume adjustment structure is adopted, including the air volume adjustment disc and the driving mechanism. Through the coordination of gears and ring gears, the rotation angle of the air volume adjustment disc is accurately adjusted, and the overlap area of the side air inlet and the ventilation port are controlled to adjust the air inlet volume.
Accurate control of the spraying effect is achieved, the spraying effect is uniform and stable, and the ideal amplitude modulation effect is achieved.
Smart Images
Figure CN223221696U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to a spray gun, and in particular to a spray gun with an air volume adjustment structure. Background Art
[0002] A spray gun is a device that atomizes liquids. Commonly used as a paint sprayer, it sprays the surface of an object, creating a uniform, aesthetically pleasing finish. To meet diverse user requirements, spray guns can be adjusted in many ways, such as adjusting the spray pattern and the spray width (spray area).
[0003] In the prior art, a spray gun has a main air inlet and a side air inlet. Adjusting the spray width of the spray gun typically involves adjusting the air volume flowing into the side air inlet, thereby varying the spray width. There are two main principles for adjusting the side air inlet. First, the spray gun is equipped with a valve that connects or disconnects the side air inlet from the main air inlet, thereby adjusting the air volume flowing into the side air inlet. However, this adjustment method results in an uneven and unsatisfactory spraying effect. Second, the spray gun includes an air volume adjustment ring with a lever attached. Turning the lever rotates the air volume adjustment ring, thereby adjusting the overlap area between the air volume adjustment ring and the side air inlet to change the air volume flowing into the side air inlet. However, the lever cannot precisely adjust the rotation angle of the air volume adjustment ring, making it difficult to precisely adjust the air volume flowing into the side air inlet. Utility Model Content
[0004] To solve the above technical problems, the present invention provides a spray gun with an air volume adjustment structure. The spray gun comprises a gun body, a nozzle mounted on the gun body, and a wind cap disposed in front of the nozzle. The nozzle comprises a liquid spray port and a main air inlet and a side air inlet surrounding the liquid spray port. The wind cap is provided with a main air outlet and a side air outlet. The main air outlet is connected to the main air inlet, and the side air outlet is connected to the side air inlet.
[0005] The spray gun also includes an air volume adjustment structure rotatably mounted on the gun body, the air volume adjustment structure including an air volume adjustment disk arranged behind the nozzle and a driving mechanism for driving the air volume adjustment disk to rotate, the air volume adjustment disk is provided with a ventilation port, the overlapping area between the ventilation port and the side air inlet changes with the rotation of the air volume adjustment disk, and the rotation axis of the driving mechanism is perpendicular to the rotation axis of the air volume adjustment disk.
[0006] Furthermore, the air volume adjustment disk is provided with a gear ring, and the driving mechanism includes an adjustment knob arranged outside the gun body and a gear connected to the adjustment knob, and the gear is engaged with the gear ring to drive the air volume adjustment disk to rotate.
[0007] Furthermore, an inner peripheral wall is provided in the gun body, and the inner peripheral wall divides the interior of the gun body into an inner chamber and an outer chamber. The inner chamber accommodates a valve core, and the vent of the air volume regulating disk is connected to the outer chamber.
[0008] Furthermore, the air volume regulating disk has a through hole, and the air volume regulating disk is sleeved on the inner circumferential wall of the gun body through the through hole; the nozzle includes a nozzle, and the end of the nozzle is connected to the inner circumferential wall of the gun body through the through hole of the air volume regulating disk, and the nozzle is provided with the liquid spray port, and the end of the valve core extends into the liquid spray port; the wind cap is provided with a center hole, and the nozzle extends into the center hole of the wind cap, and the gap between the center hole and the nozzle forms the main air outlet, and the through hole of the air volume regulating disk, the main air inlet and the main air outlet are connected.
[0009] Furthermore, the air volume regulating disk includes a coaxially arranged mounting shaft and an outer sleeve, the outer sleeve is sleeved and connected to the mounting shaft, and the mounting shaft is sleeved on the inner circumferential wall of the gun body so that the air volume regulating disk can rotate around the inner circumferential wall. The gear ring is provided on the edge of one end of the outer sleeve, and the other end has an end face, and the vent is provided on the end face.
[0010] Furthermore, the air volume regulating plate includes a fixed plate and a rotating plate, the fixed plate is installed between the rotating plate and the nozzle, the rotating plate is provided with a gear ring meshing with the gear, and multiple openings are respectively provided on the fixed plate and the rotating plate to form the vent.
[0011] Furthermore, the fixed plate has a hook, which passes through the rotating plate to limit the axial movement of the rotating plate, and the rotating plate can rotate around the hook.
[0012] Furthermore, a plurality of protrusions are provided on the edge of the fixing plate, and a plurality of grooves are provided on the outer shell of the gun body, and the protrusions are assembled into the grooves to fix the fixing plate.
[0013] Furthermore, the adjusting knob is fixedly connected to the gear via screws.
[0014] Furthermore, it also includes a locking nut, which is sleeved on the air hood and the nozzle, the locking nut has an internal thread, the gun body has an external thread, and the locking nut is screwed to the external thread of the gun body through the internal thread.
[0015] Beneficial Effects: The air volume adjustment structure of this spray gun is novel and easy to operate. The gear and gear ring cooperate to precisely adjust the rotation angle of the air volume adjustment disk, thereby accurately controlling the overlapping area of the side air inlet and the vent. This can achieve the desired amplitude modulation control for the spraying effect, and the spraying effect is uniform and stable. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a schematic diagram of the gun head of the spray gun in the embodiment of the present utility model.
[0017] Figure 2 It is an exploded schematic diagram of the gun head of the spray gun in the embodiment of the present utility model.
[0018] Figure 3 It is a schematic diagram of the assembly of the gun body and the air volume adjustment structure of the spray gun in the embodiment of the present utility model.
[0019] Figure 4 yes Figure 1 The cross-sectional view with AA as the section line is a schematic diagram of the nozzle with all side air inlets closed.
[0020] Figure 5 yes Figure 1 The cross-sectional view with AA as the section line is a schematic diagram showing that the side air inlet of the nozzle and the vent are completely overlapped.
[0021] Figure 6 It is a schematic diagram of the air volume regulating disk in the embodiment of the present utility model.
[0022] Figure 7 It is a schematic diagram of the air volume adjustment disk in another perspective in the embodiment of the present invention.
[0023] Figure 8 yes Figure 1 The sectional view with BB as the section line.
[0024] Figure 9 It is a schematic diagram of another air volume regulating disk in an embodiment of the present utility model.
[0025] Figure 10 yes Figure 9 Schematic diagram of the air volume adjustment dial from another perspective.
[0026] Figure 11 It is used in spray guns Figure 9 Schematic diagram of the exploded view of the air volume adjustment plate.
[0027] Figure 12 It is used in spray guns Figure 9 Cross-sectional view of the air volume adjustment disk in FIG.
[0028] Reference numerals: gun body-1; inner peripheral wall-11; inner chamber-12; outer chamber-13;
[0029] Nozzle-2; nozzle-21; liquid spray port-211; air inlet plate-22; main air inlet-221; side air inlet-222;
[0030] Hood-3; Center hole-31; Main air outlet-32; Side corner-33; Side air outlet-34;
[0031] Air volume adjustment plate 4; through hole 40; vent 41; gear ring 42; mounting shaft 43; outer sleeve 44; connecting rib 45; end face 46; main air flow channel 4a; side air flow channel 4b;
[0032] Air volume adjustment plate 5; through hole 50; vent 51; gear ring 52; fixed plate 53; rotating plate 54; hook 531; opening 532; protrusion 533; end surface 534; main airflow channel 5a; side airflow channel 5b;
[0033] Adjusting knob-61; gear-62; screw-63; washer-64; lock nut-7. DETAILED DESCRIPTION
[0034] Exemplary embodiments are described in detail herein, with examples illustrated in the accompanying drawings. When the following description refers to the drawings, identical numerals in different drawings represent identical or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with this application.
[0035] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. Unless otherwise defined, technical or scientific terms used in this application should have the same ordinary meaning as those of ordinary skill in the art to which this invention belongs. The terms "first," "second," and similar terms used in this application do not denote any order, quantity, or importance, but are simply used to distinguish different components. Similarly, terms such as "a" or "an" do not denote a limitation of quantity, but rather indicate the presence of at least one. "Multiple" or "several" means two or more. Unless otherwise indicated, terms such as "front," "rear," "lower," and / or "upper" are for convenience only and are not intended to limit a position or spatial orientation. Terms such as "include" or "comprising" mean that the elements or objects listed before "include" or "comprising" include the elements or objects listed after "include" or "comprising" and their equivalents, and do not exclude other elements or objects. Terms such as "connected" or "connected" are not limited to physical or mechanical connections and can include electrical connections, whether direct or indirect. As used in this specification and the appended claims, the singular forms "a," "an," "said," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
[0036] The utility model discloses a spray gun with an air volume adjustment structure, such as Figure 1 and 2 As shown, the plane has mutually perpendicular X and Y axes. The spray gun includes a gun head, which comprises a gun body 1, a nozzle 2 mounted on the gun body 1, and a hood 3 located in front of the nozzle 2. The central axis of the gun body 1 extends along the X axis, and the nozzle 2 and hood 3 are also arranged along the X axis.
[0037] like Figure 2 As shown, the nozzle 2 includes a liquid spray port 211 and a main air inlet 221 and a side air inlet 222 surrounding the liquid spray port 211. The hood 3 is provided with a main air outlet 32 and a side air outlet 34. The main air outlet 32 is connected to the main air inlet 221, and the side air outlet 34 is connected to the side air inlet 222.
[0038] The spray gun further comprises an air volume regulating structure rotatably mounted on the gun body 1, the air volume regulating structure comprising an air volume regulating disk 4 arranged behind the nozzle 2 and a driving mechanism for driving the air volume regulating disk 4 to rotate. Figure 3As shown, the air volume adjustment disk 4 is provided with a vent 41. The overlapping area of the vent 41 and the side air inlet 222 changes as the air volume adjustment disk 4 rotates. The rotation axis of the drive mechanism is perpendicular to the rotation axis of the air volume adjustment disk 4. Specifically, the air volume adjustment disk 4 rotates along the X-axis, and the drive mechanism rotates along the Y-axis.
[0039] The spray gun further comprises a locking nut 7 which is sleeved on the air cap 3 and the nozzle 2 . The locking nut 7 has an internal thread and the gun body 1 has an external thread. The locking nut 7 is screwed to the external thread of the gun body 1 via the internal thread.
[0040] Specifically, in this embodiment, Figure 6 and 7 As shown, the air volume regulating plate 4 is provided with a gear ring 42. Figure 4 、 5 As shown, the driving mechanism includes an adjusting knob 61 arranged outside the gun body 1 and a gear 62 connected to the adjusting knob 61. The gear 62 is engaged with the ring gear 42 to drive the air volume adjusting disk 4 to rotate.
[0041] like Figure 2 As shown, the adjustment body of the adjustment knob 61 is disposed outside the gun body 1. The adjustment knob 61 also has a central axis that is perpendicular to the central axis of the gun body 1. The central axis of the adjustment knob 61 extends into the gun body 1. A gasket 64 is also sleeved on the central axis and disposed between the adjustment body of the adjustment knob 61 and the gun body 1. The gasket 64 is an elastomer that provides a damping effect during the rotation of the adjustment knob 61. The adjustment knob 61 is fixedly connected to the gear 62 via a screw 63. The gear 62 engages with the ring gear 42 of the air volume adjustment disk 4. Therefore, rotating the adjustment knob 61 causes the gear 62 to rotate. The engagement of the gear 62 with the ring gear 42 drives the air volume adjustment disk 4 to rotate, thereby controlling the overlapping area between the vent 41 of the air volume adjustment disk 4 and the side air inlet 222 of the nozzle 2. In other words, it adjusts the amount of gas flowing into the side air inlet 222, thereby adjusting the spraying area.
[0042] like Figure 4 As shown, the vent 41 of the air volume adjustment disk 4 does not overlap with the side air inlet 222 of the nozzle 2, that is, the air volume adjustment disk 4 completely blocks the side air inlet 222 of the nozzle 2, and the side air inlet 222 is completely closed and cannot let in air. In the process of turning the adjustment knob 61, the gear 62 drives the air volume adjustment disk 4 to rotate, gradually opening the side air inlet 222 until it is as shown in FIG. Figure 5 As shown, the ventilation opening 41 of the air volume regulating disk 4 completely overlaps with the side air inlet 222 of the nozzle 2 .
[0043] The spray gun has a novel air volume adjustment structure and is easy to operate. The gear 62 and the ring gear 42 cooperate to precisely adjust the rotation angle of the air volume adjustment disk 4, thereby precisely controlling the overlapping area between the side air inlet 222 and the vent 41. This allows for precise control of the air volume, achieving ideal amplitude modulation control for the spraying effect, and ensuring a uniform and stable spraying effect.
[0044] Specific, combined Figure 9 As shown, the gun body 1 is provided with an inner peripheral wall 11, which divides the interior of the gun body 1 into an inner chamber 12 and an outer chamber 13. The inner chamber 12 accommodates a valve core (not shown). The gun body 1 is connected to the spray bottle, which is connected to the inner chamber 12. The valve core is used to control the liquid inlet.
[0045] The air volume regulating plate 4 has a through hole 40, through which the air volume regulating plate 4 is sleeved on the inner peripheral wall 11 of the gun body 1. The vent 41 on the air volume regulating plate 4 is connected to the outer chamber 13 of the gun body 1, and the gas enters the vent 41 from the outer chamber 13 of the gun body 1.
[0046] Combine Figure 2 and 9 As shown, the nozzle 2 includes an integrally formed nozzle 21 and an air inlet disk 22. The nozzle 21 extends along the X-axis, and the air inlet disk 22 is sleeved on the nozzle 21. The distal end of the nozzle 21 passes through the through hole 40 of the air volume adjustment disk 4 and is snapped onto the inner circumferential wall 11 of the gun body 1 to be fixedly mounted to the gun body 1. The nozzle 21 is provided with a liquid spray port 211. The valve core extends into the nozzle 21, and its distal end extends into the liquid spray port 211. The liquid in the spray pot is sprayed out from the liquid spray port 211. A gap is formed between the nozzle 21 and the air inlet disk 22 to form a main air inlet 221. Several side air inlets 222 are provided on the air inlet disk 22.
[0047] The hood 3 is provided with a central hole 31, into which the nozzle 21 extends, and the gap between the central hole 31 of the hood 3 and the nozzle 21 forms a main air outlet 32. The hood 3 also includes two side corners 33, on which side air outlets 34 are provided.
[0048] The through hole 40 of the air volume adjustment disk 4, the main air inlet 221 of the nozzle 2, and the main air outlet 32 of the hood 3 are connected to form a main airflow channel 4a. The vent 41 of the air volume adjustment disk 4, the side air inlet 222 of the nozzle 2, and the side air outlet 34 of the hood 3 are connected to form a side airflow channel 4b.
[0049] In this embodiment, if Figure 6 and 7As shown, the air volume adjustment disk 4 includes a coaxially arranged mounting shaft 43 and an outer sleeve 44, with the outer sleeve 44 being sleeved and connected to the mounting shaft 43. The outer diameter of the mounting shaft 43 is smaller than the inner diameter of the outer sleeve 44, and the length of the mounting shaft 43 is smaller than the length of the outer sleeve 44. The mounting shaft 43 and the outer sleeve 44 are connected by a connecting rib 45. The mounting shaft 43 has a through hole 40, through which the mounting shaft 43 is sleeved on the inner circumferential wall 11 of the gun body 1, allowing the air volume adjustment disk 4 to rotate about the inner circumferential wall 11.
[0050] One end of the outer sleeve 44 is edged with a gear ring 42, and the other end has an end surface 46. This end surface 46 has a through hole coaxial with the mounting shaft 43, through which the nozzle head 21 of the nozzle 2 can be mounted to the inner circumferential wall 11 of the gun body 1. Preferably, the mounting shaft 43 can be simultaneously mounted on the inner circumferential wall 11 and the end of the nozzle head 21, and rotate around them. This end surface 46 is provided with a plurality of ventilation openings 41. Preferably, the ventilation openings 41 correspond one-to-one with the side air inlets 222 of the nozzle 2.
[0051] In this embodiment, if Figure 8 As shown, gas flows from the outer chamber 13 of the gun body 1 into the air volume adjustment disk 4. A portion of the gas flows through the gap between the mounting shaft 43 and the outer sleeve 44 of the air volume adjustment disk 4 into the through-hole 40 on the end face 46 of the air volume adjustment disk 4, then flows into the main air inlet 221 of the nozzle 2, and then flows out of the main air outlet 32 of the hood 3, forming the main air flow channel 4a. The remaining gas passes through the vent 41 on the end face 46 of the air volume adjustment disk 4, then passes through the side air outlet 34 of the nozzle 2, and then flows out of the side air outlet 34 of the hood 3, forming the side air flow channel 4b. Turning the adjustment knob 61 drives the gear 62 to rotate along the Y-axis. The gear 62 engages the ring gear 42 of the air volume adjustment disk 4, driving the air volume adjustment disk 4 to rotate along the X-axis. This adjusts the overlap between the vent 41 on the air volume adjustment disk 4 and the side air inlet 222 of the nozzle 2 to control the air intake of the side air flow channel 4b.
[0052] In another embodiment, Figure 11 As shown, the air volume adjustment disk in the spray gun is another split structure.
[0053] Specific, combined Figure 9 and 10As shown, the split air volume adjustment plate 5 includes a fixed plate 53 and a rotating plate 54. The fixed plate 53 is located between the rotating plate 54 and the nozzle 2. The fixed plate 53 and the rotating plate 54 are coaxially provided with a through hole 50. The inner wall of the through hole of the fixed plate 53 also extends along the X-axis and forms a hook 531 at its end. The hook 531 passes through the through hole 50 of the rotating plate 54, thereby mounting the rotating plate 54 on the fixed plate 53. The hook 531 can limit the movement of the rotating plate 54 along the X-axis, while the rotating plate 54 can rotate around the hook 531. The fixed plate 53 is also provided with multiple openings 532 corresponding one-to-one with the side air inlet 222 of the nozzle 2. The edge of the fixed plate 53 is provided with several protrusions 533, and the outer shell of the gun body 1 is provided with several grooves. The protrusions 533 fit into the grooves to mount the fixed plate 53 to the gun body 1. One end of the rotating plate 54 is provided with a gear ring 52 meshing with the gear 62 , and the other end has an end surface 534 . The end surface 534 is provided with a plurality of openings 532 to form the ventilation holes 51 .
[0054] In this embodiment, if Figure 12 As shown, gas flows from the outer chamber 13 of the gun body 1 into the air volume adjustment disk 5. A portion of the gas flows through the through hole 50 of the fixed plate 53 into the main air inlet 221 of the nozzle 2, and then flows out from the main air outlet 32 of the hood 3, forming the main air flow channel 5a. The other portion of the gas flows through the vent 51 on the rotating plate 54, flows into the opening 532 on the fixed plate 53, and then flows into the side air inlet 222 of the nozzle 2, and then flows out from the side air outlet 34 of the hood 3, forming the side air flow channel 5b. Turning the adjustment knob 61 drives the gear 62 to rotate along the Y axis. The gear 62 engages the ring gear 52 of the rotating plate 54 to drive the rotating plate 54 to rotate along the X axis, thereby adjusting the overlap between the vent 51 on the rotating plate 54 and the opening 532 on the fixed plate 53 to control the air intake of the side air flow channel 5b.
[0055] The above description is merely a preferred embodiment of the present application and does not constitute any form of limitation to the present application. Although the present application has been disclosed as above with preferred embodiments, it is not intended to limit the present application. Any technician familiar with this profession can make slight changes or modifications to equivalent embodiments with equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present application. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.
Claims
1. A spray gun with an air volume adjustment structure, characterized in that: The invention comprises a gun body, a nozzle mounted on the gun body, and a hood provided in front of the nozzle, wherein the nozzle comprises a liquid spraying port and a main air inlet and a side air inlet surrounding the liquid spraying port, and the hood is provided with a main air outlet and a side air outlet, wherein the main air outlet is connected to the main air inlet, and the side air outlet is connected to the side air inlet; The spray gun also includes an air volume adjustment structure rotatably mounted on the gun body, the air volume adjustment structure including an air volume adjustment disk arranged behind the nozzle and a driving mechanism for driving the air volume adjustment disk to rotate, the air volume adjustment disk is provided with a ventilation port, the overlapping area between the ventilation port and the side air inlet changes with the rotation of the air volume adjustment disk, and the rotation axis of the driving mechanism is perpendicular to the rotation axis of the air volume adjustment disk.
2. The spray gun with air volume adjustment structure according to claim 1, characterized in that: The air volume adjustment disk is provided with a gear ring, and the driving mechanism includes an adjustment knob arranged outside the gun body and a gear connected to the adjustment knob. The gear is engaged with the gear ring to drive the air volume adjustment disk to rotate.
3. The spray gun with air volume adjustment structure according to claim 2, characterized in that: An inner peripheral wall is provided in the gun body, and the inner peripheral wall divides the interior of the gun body into an inner chamber and an outer chamber. The inner chamber accommodates a valve core, and the vent of the air volume adjustment disk is communicated with the outer chamber.
4. The spray gun with an air volume adjustment structure according to claim 3, characterized in that: The air volume regulating disk has a through hole, and the air volume regulating disk is sleeved on the inner circumferential wall of the gun body through the through hole; the nozzle includes a nozzle, and the end of the nozzle passes through the through hole of the air volume regulating disk and is connected to the inner circumferential wall of the gun body, the nozzle is provided with the liquid spray port, and the end of the valve core extends into the liquid spray port; the wind cap is provided with a center hole, and the nozzle extends into the center hole of the wind cap, and the gap between the center hole and the nozzle forms the main air outlet, and the through hole of the air volume regulating disk, the main air inlet and the main air outlet are connected.
5. The spray gun with air volume adjustment structure according to claim 4, characterized in that: The air volume regulating disk includes a coaxially arranged mounting shaft and an outer sleeve, the outer sleeve is sleeved and connected to the mounting shaft, and the mounting shaft is sleeved on the inner circumferential wall of the gun body so that the air volume regulating disk can rotate around the inner circumferential wall. The gear ring is provided on the edge of one end of the outer sleeve, and the other end has an end surface, and the vent is provided on the end surface.
6. The spray gun with an air volume adjustment structure according to claim 4, characterized in that: The air volume adjustment plate includes a fixed plate and a rotating plate, the fixed plate is installed between the rotating plate and the nozzle, the rotating plate is provided with a gear ring meshed with the gear, and multiple openings are respectively provided on the fixed plate and the rotating plate to form the vent.
7. The spray gun with an air volume adjustment structure according to claim 6, characterized in that: The fixed plate has a hook, and the hook passes through the rotating plate to limit the axial movement of the rotating plate. The rotating plate can rotate around the hook.
8. The spray gun with an air volume adjustment structure according to claim 7, characterized in that: The edge of the fixing plate is provided with a plurality of protrusions, the outer shell of the gun body is provided with a plurality of grooves, and the protrusions are assembled into the grooves to fix the fixing plate.
9. The spray gun with an air volume adjustment structure according to claim 2, characterized in that: The adjusting knob is fixedly connected to the gear via screws.
10. The spray gun with an air volume adjustment structure according to claim 1, characterized in that: It also includes a locking nut, which is sleeved on the air hood and the nozzle. The locking nut has an internal thread, and the gun body has an external thread. The locking nut is screwed to the external thread of the gun body through the internal thread.