Spray gun capable of adjusting target distance of cavitation nozzle

Abstract

The invention provides a spray gun capable of adjusting the target distance of a cavitation nozzle. The spray gun comprises a spray gun body; the spray gun body is provided with a water inlet and jet flow holes formed in the radial direction of the spray gun body. An elastic sealing gasket, a cavitation nozzle and an adjusting cap are arranged in the jet flow hole, the elastic sealing gasket, the cavitation nozzle and the adjusting cap are sequentially arranged from the position close to the axis of the spray gun body to the position away from the axis of the spray gun body, and the cavitation nozzle is clamped between the elastic sealing gasket and the adjusting cap; the adjusting cap is arranged in the jet flow hole in the radial direction of the spray gun body in the mode that the position can be adjusted. The adjusting cap is arranged in the jet hole in the radial direction of the spray gun body in a position adjusting mode, the cavitation nozzle can be limited, acting force can be applied to the cavitation nozzle, the position of the cavitation nozzle can be adjusted in the radial direction of the spray gun body, and therefore the jet target distance of the cavitation nozzle can be adjusted.

Description

Technical Field

[0001] The invention relates to the technical field of petroleum engineering, in particular to a spray gun with adjustable cavitation nozzle target distance. Background Art

[0002] During the drilling and completion process, near-wellbore formation blockage may occur due to blockage by foreign solid particles, drilling and completion fluid pollution, clay particle migration, etc., resulting in a decrease in oil production. Therefore, removing formation blockage is a crucial part of increasing oil and gas production. A commonly used method of removing blockage is to inject chemical solvents to remove blockage. Although this method has a good effect, it is easy to cause secondary pollution. In contrast, the impact oscillation of cavitation jets is used to remove formation blockage, which is low-cost, high-efficiency, and no secondary pollution.

[0003] The Chinese publication number is: CN 114320246A, which discloses an offshore oil field oil pipe type hydraulic jet fracturing spray gun, including a spray gun sliding sleeve, a sealing seat, a sealing sleeve, a shear sleeve, a sealing shaft and a nozzle assembly. The spray gun sliding sleeve body is provided with a through nozzle mounting hole, and the nozzle assembly is arranged in the nozzle mounting hole. The nozzle assembly is welded by a nozzle, a nozzle shell, and a hard alloy baffle. The nozzle assembly is detachable and easy to adjust. The hard alloy baffle can prevent the jet from splashing back and damaging the nozzle, and avoid the phenomenon that the nozzle aperture is enlarged during the operation and the perforating effect is reduced.

[0004] The offshore oil field tubing hydraulic jet fracturing spray gun provided by the above technical solution cannot adjust the jet target distance by changing the nozzle position because the nozzle assembly is welded as one. Summary of the invention

[0005] In view of this, the present invention proposes a spray gun with adjustable cavitation nozzle target distance, aiming to solve the problem that the existing nozzle is fixed and the jet target distance cannot be adjusted.

[0006] The present invention provides a spray gun with adjustable cavitation nozzle target distance, the spray gun comprising: a spray gun body; wherein the spray gun body is provided with a water inlet and jet holes arranged along the radial direction thereof; an elastic sealing pad, a cavitation nozzle and an adjusting cap are arranged in the jet hole, and the elastic sealing pad, the cavitation nozzle and the adjusting cap are arranged in sequence from the axis close to the spray gun body to the axis far away from the spray gun body, and the cavitation nozzle is clamped between the elastic sealing pad and the adjusting cap; the adjusting cap is arranged in the jet hole in a position-adjustable manner along the radial direction of the spray gun body, when the adjusting cap moves close to the axis of the spray gun body, the cavitation nozzle is pushed to move toward the axis of the spray gun body, so that the elastic sealing pad is elastically compressed; when the adjusting cap moves away from the axis of the spray gun body, the cavitation nozzle moves away from the axis of the spray gun body under the action of the restoring force of the elastic sealing pad, so as to realize the adjustment of the cavitation nozzle jet target distance.

[0007] Furthermore, in the above-mentioned spray gun with adjustable cavitation nozzle target distance, the jet hole comprises: a transition section and a nozzle mounting section; wherein the transition section is arranged close to the axis of the spray gun body, the nozzle mounting section is arranged on a side of the transition section away from the axis of the spray gun body, and the inner diameter of the nozzle mounting section is larger than the inner diameter of the transition section, and a positioning boss is formed between the nozzle mounting section and the transition section; the elastic sealing gasket is arranged at the positioning boss, one end of the cavitation nozzle abuts against the wall surface of the elastic sealing gasket away from the positioning boss, and the other end is clamped on the adjusting cap to adjust the jet target distance as the position of the adjusting cap is adjusted; the transition section is used to initially buffer the fluid flowing in and out of the spray gun body.

[0008] Furthermore, in the above-mentioned spray gun with adjustable cavitation nozzle target distance, an adjustment section is provided on the side of the nozzle mounting section away from the axis of the spray gun body, and the adjustment cap is arranged in the adjustment section along the radial direction of the spray gun body in a manner that allows position adjustment.

[0009] Furthermore, in the spray gun with adjustable cavitation nozzle target distance, the inner wall of the adjusting section is provided with an internal thread, and the outer wall of the adjusting cap is provided with an external thread matched with the internal thread.

[0010] Furthermore, in the spray gun with adjustable cavitation nozzle target distance, the inner diameter of the adjustment section is larger than the inner diameter of the nozzle installation section.

[0011] Furthermore, in the spray gun with adjustable cavitation nozzle target distance, a limiting boss is provided on the adjusting cap for limiting the end of the cavitation nozzle so that the cavitation nozzle is always clamped between the elastic sealing pad and the limiting boss.

[0012] Furthermore, in the spray gun with adjustable cavitation nozzle target distance, an outer wall of the cavitation nozzle and an inner wall of the jet hole are interference fit.

[0013] Furthermore, in the spray gun with adjustable cavitation nozzle target distance, the outer wall of the cavitation nozzle and the inner wall of the jet hole are fitted with each other by thermal expansion and contraction.

[0014] Furthermore, in the above-mentioned spray gun with adjustable cavitation nozzle target distance, the water inlet is arranged at the end of the spray gun body and along the axial direction of the spray gun body.

[0015] Furthermore, in the spray gun with adjustable cavitation nozzle target distance, the plurality of jet holes are arranged at intervals along the circumference of the spray gun body.

[0016] The spray gun with adjustable cavitation nozzle target distance provided by the present invention can realize the position limitation of the cavitation nozzle by providing a jet hole on the spray gun body and an adjustment cap arranged in the jet hole in a radial direction of the spray gun body in a position-adjustable manner, and can apply a force to the cavitation nozzle to push the cavitation nozzle to approach the side close to the axis of the spray gun body, and can elastically squeeze the elastic sealing pad to realize the movement of the cavitation nozzle to the side close to the axis of the spray gun body, and make the cavitation nozzle reset under the elastic reset force of the elastic sealing pad, thereby realizing the position adjustment of the cavitation nozzle along the radial direction of the spray gun body, thereby realizing the adjustment of the cavitation nozzle jet target distance, enhancing the cavitation effect of the cavitation nozzle, thereby improving the impact ability, using the high pressure generated by the collapse of the cavitation bubble, improving the drilling speed, solving the problem of near-well formation blockage, and reducing the cost while increasing the work efficiency. At the same time, the spray gun has a simple structure and low processing difficulty, and can adjust the jet target distance of the cavitation nozzle through thread matching, enhance the cavitation effect, make the cavitation nozzle have a very strong impact effect, and improve the work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings: Figure 1 A schematic structural diagram of a spray gun with adjustable cavitation nozzle target distance provided by an embodiment of the present invention; Figure 2 An axial cross-sectional view of a spray gun with adjustable cavitation nozzle target distance provided by an embodiment of the present invention; Figure 3 A tangential cross-sectional view of a spray gun jet orifice with adjustable cavitation nozzle target distance provided by an embodiment of the present invention; Figure 4 for Figure 2 A partial enlarged view of point A in the middle. DETAILED DESCRIPTION

[0018] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to be able to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features described in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0019] See also Figures 1 to 4, which shows the preferred structure of the spray gun with adjustable cavitation nozzle target distance provided by the embodiment of the present invention. As shown in the figure, the spray gun includes: a spray gun body 1, an elastic sealing pad 2, a cavitation nozzle 3 and an adjustment cap 4; wherein, The spray gun body 1 is provided with a water inlet 11 and jet holes 12 arranged radially thereof. Figure 1 The left end of the spray gun body 1 is provided with a water inlet 11 arranged along the axial direction of the spray gun body 1, so that the fluid flows from the water inlet 11 into the interior of the spray gun body 1. A jet hole 12 may be provided in the middle position of the spray gun body 1, and the jet hole 12 may be arranged along the radial direction of the spray gun body 1 to connect to the interior of the spray gun body 1, so that when the pressure inside the spray gun body 1 rises to a preset pressure, the fluid flows to the jet hole 12. In this embodiment, there are multiple jet holes 12, and the multiple jet holes 12 are arranged at intervals along the circumference of the spray gun body 1. The jet holes 12 may be arranged at intervals to complete the simultaneous operation of multiple nozzles. For example, there may be four jet holes 12 and any two of them are 90° apart, and the jet holes 12 are arranged throughout the spray gun body 1.

[0020] The jet hole 12 is provided with an elastic sealing pad 2, a cavitation nozzle 3 and an adjusting cap 4, and the elastic sealing pad 2, the cavitation nozzle 3 and the adjusting cap 4 are arranged in sequence from the axis close to the spray gun body 1 to the axis far away from the spray gun body 1, as shown in FIG. Figure 4 As shown, the elastic sealing pad 2, the cavitation nozzle 3 and the adjustment cap 4 are arranged from bottom to top, and the cavitation nozzle 3 is clamped between the elastic sealing pad 2 and the adjustment cap 4. Specifically, the elastic sealing pad 2, the cavitation nozzle 3 and the adjustment cap 4 are all arranged inside the jet hole 12, and a positioning boss 121 may be provided in the jet hole 12, and the installation positions of the elastic sealing pad 2 and the cavitation nozzle 3 can be positioned so that the elastic sealing pad 2 can be clamped at the positioning boss 121. On the one hand, the elastic sealing pad 2 prevents the leakage of the high-pressure fluid, and on the other hand, the position of the cavitation nozzle 3 is changed by elastic deformation, so that the cavitation nozzle 3 can be adjusted in position. The cavitation nozzle 3 is used to perform cavitation treatment on the fluid. Cavitation is the process of converting liquid into gas under local low pressure conditions. The cavitation jet is mainly generated by the cavitation nozzle, and the jet target distance of the cavitation nozzle 3 has a great influence on the impact effect of the cavitation jet. Therefore, it is beneficial to enhance the jet impact effect by reasonably controlling the jet target distance of the cavitation nozzle 3 according to different wellbore sizes.

[0021] The jet target distance of the cavitation nozzle 3 has a crucial influence on the impact of the cavitation jet. In order to improve the jet impact effect, the adjustment cap 4 is adjusted along the radial direction of the spray gun body 1 (such as Figure 2 The vertical direction shown in FIG. 1 is arranged in the jet hole 12 in a position-adjustable manner, and when the adjusting cap 4 moves close to the axis of the spray gun body 1 (as shown in FIG. 1 ), the adjusting cap 4 moves close to the axis of the spray gun body 1 (as shown in FIG. 1 ). Figure 4 ), pushing the cavitation nozzle 3 toward the axis of the spray gun body 1 (as shown in FIG. Figure 4 As shown in the figure, the elastic seal 2 is elastically compressed; when the adjusting cap 4 moves away from the axis of the spray gun body 1 (as shown in the figure, the elastic seal 2 is elastically compressed); Figure 4 The cavitation nozzle 3 moves upward as shown in the figure), and the cavitation nozzle 3 moves away from the axis of the spray gun body 1 under the restoring force of the elastic sealing pad 2, so as to adjust the jet target distance of the cavitation nozzle 3, thereby enhancing the jet impact effect. Specifically, the adjustment cap 4 and the cavitation nozzle 3 are both radially (as shown in the figure) of the spray gun body 1. Figure 2 In other words, the installation depth of the adjusting cap 4 installed in the jet hole 12 can be adjusted. When adjusting the installation depth of the adjusting cap 4, the elastic sealing pad 2 can be used to push the cavitation nozzle 3 along the radial direction of the spray gun body 1 (such as Figure 2 The position of the cavitation nozzle 3 is adjusted by adjusting the vertical direction (as shown), that is, the jet target distance of the cavitation nozzle 3 is adjusted. When the installation depth of the adjusting cap 4 in the jet hole 12 is increased, the adjusting cap 4 exerts the following force: Figure 4 The downward pressure is applied to the cavitation nozzle 3, and the cavitation nozzle 3 moves downward and compresses the elastic sealing pad 2, causing the elastic sealing pad 2 to deform and shrink, and finally the cavitation nozzle 3 moves to the side close to the axis of the spray gun body 1 (such as Figure 2 When the elastic sealing pad 2 is deformed and contracted, it will exert an upward restoring force on the cavitation nozzle 3. When the installation depth of the adjusting cap 4 in the jet hole 12 is reduced, the cavitation nozzle 3 moves upward under the restoring force of the elastic sealing pad 2, that is, the cavitation nozzle 3 moves to the side away from the axis of the spray gun body 1 (as shown in FIG. Figure 2 In this embodiment, the cavitation nozzle 3 is clamped between the elastic sealing pad 2 and the adjusting cap 4. Preferably, the adjusting cap 4 is provided with a limiting boss 41 for adjusting the end of the cavitation nozzle 3 (such as Figure 4 The top end shown in the figure is limited so that the cavitation nozzle 3 is always stuck between the elastic sealing pad 2 and the limiting boss 41, so that the cavitation nozzle 3 can be adjusted in position when the position of the adjusting cap 4 is adjusted, so as to achieve the purpose of adjusting the jet target distance.

[0022] In this embodiment, the outer wall of the cavitation nozzle 3 and the inner wall of the jet hole 12 are interference fit to avoid the self-movement of the cavitation nozzle 3, that is, when the adjustment cap 4 is not moving, the cavitation nozzle 3 automatically compresses the elastic sealing pad 2, and then through the interference fit between the outer wall of the cavitation nozzle 3 and the inner wall of the jet hole 12, the jet target distance of the cavitation nozzle 3 is fixed, and then the impact stability is ensured. Among them, the outer wall of the cavitation nozzle 3 and the inner wall of the jet hole 12 can be used to achieve interference fit by thermal expansion and contraction, that is, the spray gun body 1 can be heated first, and then the elastic sealing pad 2 and the cavitation nozzle 3 are installed in the jet hole 12 in sequence after heating, and after the spray gun body 1 is cooled, the outer wall of the cavitation nozzle 3 and the inner wall of the jet hole 12 can be tightly attached to achieve interference fit.

[0023] Continue to see Figure 4 The jet hole 12 includes: a transition section 122, a nozzle installation section 123 and an adjustment section 124; wherein the transition section 122 is arranged close to the axis of the spray gun body 1, and the nozzle installation section 123 is arranged on a side of the transition section 122 away from the axis of the spray gun body 1 (such as Figure 4 The upper side shown in the figure), and the inner diameter of the nozzle mounting section 123 is larger than the inner diameter of the transition section 122, and a positioning boss 121 is formed between the nozzle mounting section 123 and the transition section 122; the elastic sealing pad 2 is arranged at the positioning boss 121, and one end of the cavitation nozzle 3 (such as Figure 4 The lower end shown in FIG. 1 abuts against the wall surface of the elastic sealing pad 2 away from the positioning boss 121 (such as Figure 4 The top wall shown in the figure) and the other end (as shown in the figure) Figure 4 The upper end shown in the figure is clamped on the adjusting cap 4 to adjust the jet target distance as the position of the adjusting cap 4 is adjusted; the transition section 122 is used to initially buffer the fluid flowing inside and outside the spray gun body 1.

[0024] Specifically, the interior of the jet hole 12 is a cylindrical stepped structure, and can be divided into three sections from the position close to the axis of the spray gun body 1 to the position far from the axis of the spray gun body 1, namely the transition section 122, the nozzle installation section 123 and the adjustment section 124, and the inner diameters of the three gradually increase, especially the inner diameter of the nozzle installation section 123 is larger than the inner diameter of the transition section 122, so that a positioning boss 121 is formed between the nozzle installation section 123 and the transition section 122, which serves as an installation positioning platform for the elastic sealing gasket 2. A transition cavity 125 is formed inside the transition section 122, which can initially buffer the fluid flowing in and out of the spray gun body 1, reduce the initial impact force of the fluid on the cavitation nozzle 3, and increase the service life of the cavitation nozzle 3; the end of the transition section 122 (such as Figure 4 The elastic sealing pad 2 is arranged at the positioning boss 121, the cavitation nozzle 3 is partially arranged at the nozzle mounting section 123, and one end of the cavitation nozzle 3 (as shown in FIG. Figure 4The lower end shown in FIG. 1 abuts against the wall surface of the elastic sealing pad 2 away from the positioning boss 121 (such as Figure 4 The top wall shown in FIG. 1 ) and the other end (as shown in FIG. Figure 4 The nozzle mounting section 123 is provided with a plurality of nozzles, and the nozzles are provided with a plurality of nozzles, and the plurality of ... Figure 4 The upper side shown in FIG. 1 is provided with an adjustment section 124, and the adjustment cap 4 is adjusted along the radial direction of the spray gun body 1 (as shown in FIG. Figure 4 The vertical direction shown in the figure is arranged in the adjustment section 124 in a position-adjustable manner to promote the cavitation nozzle 3 to adjust its position, thereby adjusting the jet target distance of the cavitation nozzle 3. The fluid flows into the spray gun body 1 from the water inlet 11. When the jet reaches a certain pressure, the fluid enters the transition chamber 125 through the water outlet 126, and then forms a cavitation jet through the cavitation nozzle 3 to eject the jet hole 12, wherein the position of the cavitation nozzle 3 can be adjusted by means of the nozzle cap 4. Among them, the inner diameter of the adjustment section 124 is larger than the inner diameter of the nozzle installation section 123, so as to make way for the installation of the cavitation nozzle 3.

[0025] In this embodiment, the inner wall of the adjustment section 124 is provided with an internal thread, the outer wall of the adjustment cap 4 is provided with an external thread matching the internal thread, and the adjustment cap 4 is screwed with the adjustment section 124 to achieve radial position adjustment, thereby adjusting the position of the cavitation nozzle 3. Of course, the position adjustment between the two can also be performed in other ways, which is not limited in this embodiment.

[0026] The working principle of the spray gun is as follows: the spray gun body 1 can be connected with other jet devices, the fluid flows from the external jet device into the water inlet 11 and into the spray gun body 1. As the fluid continues to flow in, the internal pressure of the spray gun body 1 continues to increase. When the pressure rises to a certain level, the fluid flows into the transition chamber 125 at the water outlet 126. The transition chamber 125 performs initial buffering on the water flow. The fluid flows into the cavitation nozzle 3 through the elastic sealing pad 2. The inner cavity structure of the cavitation nozzle 3 generates cavitation bubbles in the fluid, and the cavitation bubbles are ejected from the jet hole 12 with the jet. When the target distance of the cavitation nozzle 3 needs to be adjusted, the screwing depth of the adjusting cap 4 in the jet hole 12 can be changed. When the screwing depth of the adjusting cap 4 in the jet hole 12 increases, the convex limiting boss 41 of the adjusting cap 4 will generate pressure on the cavitation nozzle 3, and the cavitation nozzle 3 thereby compresses the elastic sealing pad 2, causing the elastic sealing pad 2 to deform and shrink. Finally, the cavitation nozzle 3 approaches the side close to the axis of the spray gun body 1, and the jet target distance of the cavitation nozzle 3 is changed. The elastic sealing pad 2 deforms and contracts, which applies an upward restoring force to the cavitation nozzle 3. When the installation depth of the adjusting cap 4 in the jet hole 12 decreases, the cavitation nozzle 3 moves upward under the restoring force of the elastic sealing pad 2, that is, the cavitation nozzle 3 moves away from the axis of the spray gun body 1 (such as Figure 2 As the cavitation nozzle 3 approaches (as shown above), the jet target distance of the cavitation nozzle 3 is changed.

[0027] The manufacturing method of the spray gun is as follows: a spray gun body 1 is provided with through jet holes 12 spaced 90 degrees apart, the internal shape of the jet holes 12 is a cylindrical stepped type, the jet holes 12 are processed by drilling straight holes-rough boring holes-fine boring holes, the manufacturing difficulty is low and the processing accuracy is high; for the cavitation nozzle 3, due to the irregularity of its inner cavity, it is first cast by a mold and then finely processed by a lathe; the jet hole 12 and the cavitation nozzle 3 are closely attached to each other by the form of thermal expansion and contraction, the through jet hole 12 and the cavitation nozzle 3 on the spray gun body 1 are processed separately, the spray gun body 1 is heated so that the elastic sealing pad 2 and the cavitation nozzle 3 can be placed in the jet hole 12, the elastic sealing pad 2 and the cavitation nozzle 3 are placed in the jet hole 12 in turn, the spray gun body 1 is waited for to cool down, and the interference fit of the cavitation nozzle 3 and the jet hole 12 is completed.

[0028] In summary, the spray gun with adjustable cavitation nozzle target distance provided in the present embodiment can limit the cavitation nozzle 3 by providing a jet hole 12 on the spray gun body 1 and an adjusting cap 4 arranged in the jet hole in a position-adjustable manner along the radial direction of the spray gun body 1, and can apply a force to the cavitation nozzle 3 to push the cavitation nozzle 3 toward the side close to the axis of the spray gun body 1, and can elastically squeeze the elastic sealing pad 2 to achieve the movement of the cavitation nozzle 3 toward the side close to the axis of the spray gun body 1, and the cavitation nozzle 3 can be reset under the elastic reset force of the elastic sealing pad 2, thereby achieving the radial position adjustment of the cavitation nozzle 3 along the spray gun body 1, thereby achieving the adjustment of the jet target distance of the cavitation nozzle 3, enhancing the cavitation effect of the cavitation nozzle 3, thereby improving the impact ability, and utilizing the high pressure generated by the collapse of cavitation bubbles to increase the drilling speed, solve the problem of blockage of the near-wellbore formation, and reduce costs while increasing work efficiency. At the same time, the spray gun has a simple structure and low processing difficulty. The jet target distance of the cavitation nozzle 3 can be adjusted through thread matching to enhance the cavitation effect, so that the cavitation nozzle 3 has a very strong impact effect and improves work efficiency.

[0029] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0030] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A spray gun with adjustable cavitation nozzle target distance, characterized in that: include: Spray gun body; wherein, The spray gun body is provided with a water inlet and jet holes arranged along its radial direction; An elastic sealing pad, a cavitation nozzle and an adjusting cap are arranged in the jet hole, and the elastic sealing pad, the cavitation nozzle and the adjusting cap are arranged in sequence from the axis close to the spray gun body to the axis far away from the spray gun body, and the cavitation nozzle is clamped between the elastic sealing pad and the adjusting cap; The adjusting cap is arranged in the jet hole along the radial direction of the spray gun body in a position-adjustable manner. When the adjusting cap moves close to the axis of the spray gun body, the cavitation nozzle is pushed to move toward the axis of the spray gun body, so that the elastic sealing pad is elastically compressed; when the adjusting cap moves away from the axis of the spray gun body, the cavitation nozzle moves away from the axis of the spray gun body under the action of the restoring force of the elastic sealing pad, thereby realizing the adjustment of the cavitation nozzle jet target distance.

2. The spray gun with adjustable cavitation nozzle target distance according to claim 1, characterized in that: The jet hole includes: a transition section and a nozzle installation section; wherein, The transition section is arranged close to the axis of the spray gun body, the nozzle installation section is arranged on a side of the transition section away from the axis of the spray gun body, and the inner diameter of the nozzle installation section is larger than the inner diameter of the transition section, and a positioning boss is formed between the nozzle installation section and the transition section; The elastic sealing pad is arranged at the positioning boss, one end of the cavitation nozzle abuts against the wall surface of the elastic sealing pad away from the positioning boss, and the other end is clamped on the adjustment cap to adjust the jet target distance as the position of the adjustment cap is adjusted; The transition section is used to initially buffer the fluid flowing in and out of the spray gun body.

3. The spray gun with adjustable cavitation nozzle target distance according to claim 2, characterized in that: An adjustment section is provided on one side of the nozzle installation section away from the axis of the spray gun body, and the adjustment cap is arranged in the adjustment section along the radial direction of the spray gun body in a manner that the position can be adjusted.

4. The spray gun with adjustable cavitation nozzle target distance according to claim 3, characterized in that: The inner wall of the adjusting section is provided with an internal thread, and the outer wall of the adjusting cap is provided with an external thread matched with the internal thread.

5. The spray gun with adjustable cavitation nozzle target distance according to claim 3, characterized in that: The inner diameter of the adjusting section is larger than the inner diameter of the nozzle mounting section.

6. The spray gun with adjustable cavitation nozzle target distance according to any one of claims 1 to 5, characterized in that: The adjusting cap is provided with a limiting boss for limiting the end of the cavitation nozzle so that the cavitation nozzle is always clamped between the elastic sealing pad and the limiting boss.

7. The spray gun with adjustable cavitation nozzle target distance according to any one of claims 1 to 5, characterized in that: The outer wall of the cavitation nozzle and the inner wall of the jet hole are interference fit.

8. The spray gun with adjustable cavitation nozzle target distance according to claim 7, characterized in that: The outer wall of the cavitation nozzle and the inner wall of the jet hole are fitted with each other by thermal expansion and contraction.

9. The spray gun with adjustable cavitation nozzle target distance according to any one of claims 1 to 5, characterized in that: The water inlet is arranged at the end of the spray gun body and along the axial direction of the spray gun body.

10. The spray gun with adjustable cavitation nozzle target distance according to any one of claims 1 to 5, characterized in that: There are a plurality of the jet holes, and the plurality of the jet holes are arranged at intervals along the circumference of the spray gun body.

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