Extendable high-pressure nozzle and sensor assembly

Abstract

Extendable high-pressure nozzle, characterized in that it comprises a jacket tube assembly (1), a telescopic tube assembly (2) arranged telescopically in the jacket tube assembly (1) and a spray head (3) attached to the front end of the telescopic tube assembly (2); wherein the casing tube assembly (1) has a receiving chamber (11), wherein the casing tube assembly (1) comprises a central column (12) extending forward from the rear end of the receiving chamber (11), wherein the front end of the central column (12) has at least one passage chamber (121) through which washing liquid can flow; wherein the telescopic tube assembly (2) comprises a telescopic tube (21) and a double-sided self-locking piston (22) attached to the rear end of the telescopic tube (21); wherein the telescopic tube (21) includes an internal transition channel (211); the front end of the central column (12) penetrates the double-sided self-locking piston (22) and enters the transition channel (211); wherein the receiving chamber (11) is separated by the double-sided self-locking piston (22), thereby forming a rear liquid storage chamber (111); wherein, when the rear liquid storage chamber (111) is supplied with liquid, the water pressure via the double-sided self-locking piston (22) pushes the telescopic tube assembly (2) and the spray head (3) from the rear position to the front, thereby ejecting the spray head (3); wherein, when the double-sided self-locking piston (22) is pushed into the front position by the water pressure, the rear liquid storage chamber (111) connects to the transition channel (211) via the passage chamber (121) and the spray head (3) sprays out washing liquid.

Description

TECHNICAL AREA

[0001] The present invention relates to the field of nozzle technology and in particular relates to a retractable high-pressure nozzle and a sensor arrangement. STATE OF THE ART

[0002] Because extendable high-pressure nozzles emit high-pressure water jets when extended and can be concealed when retracted, they are frequently used in vehicles, for example, in cars with sensor modules. When extended, the high-pressure water jet cleans the surface of the sensor module to ensure its detection function. When retracted, the nozzle can be hidden within the vehicle, contributing to a more aesthetically pleasing appearance.

[0003] Existing retractable high-pressure washer nozzles typically have an end cap that forms a single unit with the vehicle's exterior to enhance its aesthetics. However, in practice, this end cap is often difficult to extend due to icing. If high-pressure washer fluid enters the nozzle's inlet and the end cap cannot be opened, the sealing ring or valve inside the nozzle, responsible for opening the nozzle, is forced open. The washer fluid then sprays into the vehicle's interior, resulting in water leakage at best, but at worst, causing an electrical short circuit or even spontaneous combustion.Furthermore, with the existing extendable high-pressure nozzle, the leakage of the washing fluid means that it cannot be sprayed onto the surface of the sensor module before the end cap is pushed on, which leads to the failure of the high-pressure function of the high-pressure nozzle and ultimately to an abnormal sensitivity of the sensor module. CONTENT OF THE PRESENT INVENTION

[0004] The problem to be solved by the present invention is: to provide an extendable high-pressure nozzle that is able to spray washing fluid only after the end cap has been pushed on, and that has a better cleaning function, as well as a sensor arrangement with such an extendable high-pressure nozzle.

[0005] The technical solution to the present problem according to the present invention is as follows: an extendable high-pressure nozzle comprising a jacket tube assembly, a telescopic tube assembly arranged telescopically in the jacket tube assembly, and a spray head attached to the front end of the telescopic tube assembly. wherein the casing tube assembly has a receiving chamber, wherein the casing tube assembly includes a central column extending forward from the rear end of the receiving chamber, wherein the front end of the central column has at least one passage through which washing liquid can flow; wherein the telescopic tube assembly comprises a telescopic tube and a double-sided self-locking piston attached to the rear end of the telescopic tube; wherein the telescopic tube includes an internal transition channel; the front end of the central column penetrates the double-sided self-locking piston and enters the transition channel; wherein the receiving chamber is separated by the double-sided self-locking piston, thereby forming a rear liquid storage chamber; wherein, when the rear liquid storage chamber is supplied with liquid, the water pressure via the double-sided self-locking piston pushes the telescopic tube assembly and the spray head from the rear position to the front, thereby ejecting the spray head; wherein, when the double-sided self-locking piston is pushed into the front position by the water pressure, the rear liquid storage chamber connects to the transition channel via the passage chamber and the spray head sprays washing fluid.

[0006] In contrast to the prior art, the sheathed tube assembly of the present invention has a receiving chamber and a central column, the central column having a through-chamber. The telescopic tube assembly comprises a telescopic tube and a self-locking piston on both sides, wherein the receiving chamber is separated by the self-locking piston, thereby forming a rear fluid storage chamber. When the rear fluid storage chamber is supplied with fluid, the hydraulic pressure pushes against the self-locking piston on both sides. This causes the piston to be advanced from its rear position and simultaneously performs a self-locking deformation towards the inner wall of the receiving chamber and the outer wall of the central column.This ensures that, even under high hydraulic pressure in the rear fluid reservoir, the piston can be stably pushed forward without leaking at the edges of the central column and the outer tube assembly. Thus, the hydraulic pressure acts as fully as possible on the telescopic tube assembly to ensure that it first ejects the spray head. When the self-locking piston is forced into the forward position by water pressure, its position corresponds to the passage. At this point, the spray head and end cap have already been ejected, and the rear fluid reservoir connects to the transition channel via the passage. Ultimately, this ensures that the washing fluid is only sprayed from the spray head after the spray head and end cap have been ejected.This prevents water from leaking into the vehicle interior due to premature spraying while the spray head is not extended, and simultaneously improves the cleaning effect.

[0007] In an extendable high-pressure nozzle according to the present invention, the self-locking piston on both sides comprises a press-fit section arranged near the rear end of the receiving chamber; wherein the press-fit section comprises an outer self-locking ring and an inner self-locking ring; wherein, when the rear liquid storage chamber is supplied with liquid, the outer self-locking ring deforms towards the inner wall of the receiving chamber and the inner self-locking ring deforms towards the outer wall of the central column.

[0008] In an extendable high-pressure nozzle according to the present invention, the self-locking piston on both sides has a play-pass section located away from the rear end of the receiving chamber; wherein the play-pass section is designed such that there is a first play between it and the inner wall of the receiving chamber and a second play between it and the outer wall of the central column; where there is a hook groove in the game pass section.

[0009] In an extendable high-pressure nozzle according to the present invention, the jacket tube assembly comprises a jacket tube main body, a jacket tube cover arranged at the front end of the jacket tube main body, and a liquid supply line arranged at the rear end of the jacket tube main body; wherein the receiving space is arranged between the main body of the casing tube and the tube closure cap; wherein the central column comprises a mounting section arranged at the rear end of the main body of the casing tube; wherein the mounting section has at least one liquid supply opening; wherein the liquid supply line supplies liquid through the liquid supply opening to the rear liquid storage chamber.

[0010] In an extendable high-pressure nozzle according to the present invention, the telescopic tube assembly comprises a stop disc arranged at the rear end of the telescopic tube and a hook section attached to the rear end of the stop disc; wherein the stop disc interacts with the front end face of the pass section; wherein the hook section interacts with the hook groove; wherein several stiffening ribs are arranged in the hook groove, which are designed to extend from the inner wall to the outer wall of the hook groove.

[0011] In a retractable high-pressure nozzle according to the present invention, it further comprises a return structure; wherein the jacket tube cover comprises a cover body, several locking lugs distributed along the circumference of the cover body and a plug connector attached to the rear end of the cover body, wherein the jacket tube main body comprises a mounting plate attached to the front end, the mounting plate having several locking grooves, wherein when the plug connector is inserted into the jacket tube main body, the locking lugs engage in the locking grooves; wherein the lid body comprises a front stop plate; wherein the return mechanism is arranged on the outside around the telescopic tube, wherein the rear end of the return mechanism rests against the stop disc and the front end rests against the front stop plate via the plug connector; wherein the telescopic tube includes a limiting disc; wherein the limiting disc is designed to interact with the front stop plate to create a limit; wherein the double-sided self-locking piston is in the forward position when the limiting disc comes into contact with the front stop plate.

[0012] In an extendable high-pressure nozzle according to the present invention, the passage space is designed as at least one fluid guide groove, which is arranged at the front end of the central column.

[0013] In an extendable high-pressure nozzle according to the present invention, the spray head comprises a spray head connection section, a spraying section arranged at the front end of the spray head connection section and a sealing ring arranged in the spray head connection section; wherein the spray head connection section has a mounting cavity; wherein the front end of the telescopic tube is inserted into the mounting cavity and rests against the sealing ring; wherein the spray section has a pre-pressure chamber connected to the assembly cavity, a secondary pressure chamber connected to the pre-pressure chamber and a water outlet channel connected to the secondary pressure chamber.

[0014] In an extendable high-pressure nozzle according to the present invention, it further comprises a heating structure; the heating structure comprising at least one heating element; the jacket tube assembly further comprising a heating housing arranged outside the rear liquid storage space; the heating element arranged in the heating housing to heat the washing liquid in the rear liquid storage space.

[0015] The above problem is also solved by a sensor arrangement comprising the aforementioned extendable high-pressure nozzle and further comprising a mounting cover and a sensor section arranged inside the mounting cover; wherein the mounting cover comprises a sensor section mounting frame, two wing plates attached to both sides of the sensor section mounting frame, and a nozzle mounting plate attached to the upper or lower end of the sensor section mounting frame; wherein the sensor section comprises a sensor surface; wherein the sensor section is arranged in the sensor section mounting frame, wherein the sensor surface protrudes from the sensor section mounting frame; the mounting plate is attached to the nozzle mounting plate, wherein, in the extended state of the spray head, the washing fluid sprayed from the water outlet channel is directed towards the sensor surface. BRIEF DESCRIPTION OF THE DRAWING Fig. Figure 1 shows a perspective view of the extendable high-pressure nozzle in the retracted state according to a preferred embodiment of the present invention. Fig. Figure 2 shows a schematic sectional view of the extendable high-pressure nozzle in the retracted state according to a preferred embodiment of the present invention. Fig. Figure 3 shows a perspective view of the extendable high-pressure nozzle in the extended state according to a preferred embodiment of the present invention. Fig. Figure 4 shows a schematic sectional view of the extendable high-pressure nozzle in the extended state according to a preferred embodiment of the present invention. Fig. Figure 5 shows a schematic sectional view of the extendable high-pressure nozzle in the extended state according to a preferred embodiment of the present invention. Fig. Figure 6 shows a schematic sectional view of the extendable high-pressure nozzle in the extended state according to a preferred embodiment of the present invention. Fig. Figure 7 shows a perspective view of the double-sided self-locking piston according to a preferred embodiment of the present invention. Fig. Figure 8 shows a schematic sectional view of the casing tube assembly according to a preferred embodiment of the present invention. Fig. Figure 9 shows a perspective view of the double-sided self-locking piston and the telescopic tube assembly according to a further preferred embodiment of the present invention. Fig. Figure 10 shows a perspective side view of the sensor arrangement according to a preferred embodiment of the present invention. Fig. Figure 11 shows a perspective view from another side of the sensor arrangement according to a preferred embodiment of the present invention. Fig. Figure 12 shows a schematic side view of the sensor arrangement according to a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0016] Before an embodiment of the present invention is described in detail, it should be understood that the invention is not limited in its application to the details of the design and arrangement of the components as set forth in the following description or illustrated in the accompanying drawings. The invention is also conceivable in other embodiments and can be implemented in various ways. Furthermore, the words and terms used herein are descriptive and not to be understood as limiting. The use of "comprise" or "feature" and their variants in this document is intended to cover the entries listed below and their equivalents, as well as additional entries.Unless otherwise specified or limited, the terms "assembly," "connection," "bracket," and "coupling," and their variants, are used broadly to encompass both direct and indirect installations, connections, brackets, and couplings. The terms "installation," "connection," "bracket," and "coupling," and their variants, are also used broadly to encompass both direct and indirect installations, connections, brackets, and couplings. Furthermore, the terms "connection" and "coupling" are not limited to physical or mechanical connections or couplings.

[0017] Firstly, in the disclosure of the present invention, the directional or positional relationship indicated by terms such as "longitudinal," "transverse," "above," "below," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outside," etc., refers to the directional or positional relationship as depicted in the accompanying drawings. This serves only to simplify the description of the invention and does not imply that the devices or elements so designated must have a particular orientation or be designed and operated in a particular direction. Therefore, the aforementioned terms are not to be understood as limiting the invention. Secondly, the term "one" is to be understood as "at least one" or "one or more," i.e., in one embodiment the number of an element may be one, while in other embodiments it may be several.The term "a" should not be understood as a restriction of the quantity.

[0018] Those skilled in the art should understand that the embodiments of the invention shown in the above description and in the figures serve only as examples and do not limit the invention. The purpose of the present invention has been fully and effectively achieved. The functions and structural principles of the present invention have been illustrated and explained in the exemplary embodiments. Without deviating from these principles, the embodiments of the invention may include any variations or modifications.

[0019] Embodiments of the present invention are described in more detail below in conjunction with the accompanying figures.

[0020] With reference to Fig. Figures 1-9 depict an extendable high-pressure nozzle comprising a jacket tube assembly 1, a telescopic tube assembly 2 arranged telescopically in the jacket tube assembly 1, and a spray head 3 attached to the front end of the telescopic tube assembly 2; wherein the jacket tube assembly 1 has a receiving chamber 11, the jacket tube assembly 1 comprising a central column 12 extending forward from the rear end of the receiving chamber 11, the front end of the central column 12 having at least one passage 121 through which washing fluid can flow; wherein the telescopic tube assembly 2 comprises a telescopic tube 21 and a self-locking piston 22 attached to the rear end of the telescopic tube 21; wherein the telescopic tube 21 includes an internal transition channel 211; the front end of the central column 12 penetrates the self-locking piston 22 and enters the transition channel 211;wherein the receiving chamber 11 is separated by the double-sided self-locking piston 22, thereby forming a rear liquid storage chamber 111; wherein, when the rear liquid storage chamber 111 is supplied with liquid, the water pressure via the double-sided self-locking piston 22 pushes the telescopic tube assembly 2 and the spray head 3 from the rear position to the front, thereby ejecting the spray head 3; wherein, when the double-sided self-locking piston 22 is pushed into the forward position by the water pressure, the rear liquid storage chamber 111 connects to the transition channel 211 via the passage chamber 121 and the spray head 3 sprays out washing liquid.

[0021] In practical application, the sheathed tube assembly 1 of the present invention comprises a receiving chamber 11 and a central column 12, the central column 12 having a passage chamber 121. The telescopic tube assembly 2 includes a telescopic tube 21 and a self-locking piston 22, wherein the self-locking piston 22 separates a rear fluid storage chamber 111 from the receiving chamber 11. When the rear fluid storage chamber 111 is supplied with fluid, the hydraulic pressure pushes the self-locking piston 22. This causes the self-locking piston 22 to generate a self-locking deformation relative to the receiving chamber 11 and the central column 12 when moving from the rear position.This ensures that, even under high hydraulic pressure in the rear fluid reservoir 111, the self-locking piston 22 can be stably pushed forward without leaking at the edges of the central column 12 and the outer tube assembly 1. Thus, the hydraulic pressure acts as fully as possible on the telescopic tube assembly 2 to ensure that the telescopic tube assembly 2 first ejects the spray head 3. When the self-locking piston 22 is pushed into the forward position by water pressure, its position corresponds to the passage 121. At this point, the spray head 3 and the end cap have necessarily already been ejected. The rear fluid reservoir 111 and the transition channel 211 are then connected via the passage 121, ensuring that the washing fluid is only sprayed from the spray head 3 after the spray head 3 and the end cap have been ejected.This prevents water from leaking into the vehicle interior, which would occur if the washing fluid is sprayed without the spray head 3 being extended, and also improves the cleaning effect.

[0022] It is worth noting that difficulties in ejecting the end cap and spray head 3 can be caused not only by icing, but also by dirt and deposit buildup, as well as human factors. By using the aforementioned extendable high-pressure nozzle, both the spray head 3 and the end cap can be ejected first, after which the spray head 3 sprays washing fluid to address situations other than icing.

[0023] Please continue viewing Fig. 2 and Fig. 5, wherein the double-sided self-locking piston 22 comprises a press-fit section 221 near the rear end of the receiving chamber 11; the press-fit section 221 comprises an outer self-locking ring 2211 and an inner self-locking ring 2212; when the rear fluid storage chamber 111 is supplied with fluid, the outer self-locking ring 2211 deforms towards the inner wall of the receiving chamber 11, and the inner self-locking ring 2212 deforms towards the outer wall of the central column 12.

[0024] It is worth noting that the double-sided self-locking piston 22 has a piston bore through which the central column 12 passes. The inner self-locking ring 2212 is arranged at the inner edge of this piston bore, while the outer self-locking ring 2211 is positioned at the outer edge of the press-fit section 221.

[0025] More precisely, referring to the enlarged view in the lower right corner of Fig. 2. When the rear fluid reservoir 111 receives a fluid supply in direction A, the outer self-locking ring 2211 deforms in direction B. The higher the hydraulic pressure, the more firmly the outer self-locking ring 2211 presses against the inner wall of the receiving chamber 11, thus preventing leakage of the washing fluid towards the inner wall of the receiving chamber 11. The inner self-locking ring 2212 deforms in direction C, and the higher the hydraulic pressure, the more firmly it presses against the outer wall of the center column 12, thus preventing leakage of the washing fluid towards the outer wall of the center column 12. Due to the double-sided self-locking design, the rear fluid reservoir 111 can withstand high hydraulic pressure without leaking, thus ensuring stable extension of the telescopic tube assembly 2 and the spray head 3.

[0026] Furthermore, conventional pistons often form a seal through an interference fit between the outer wall of the piston and the inner wall of the rear fluid storage chamber 111. At excessively high operating temperatures, conventional pistons can deform and shrink, causing the interference fit to lose its effectiveness and leading to leaks. In contrast, the outer self-locking ring 2211 and the inner self-locking ring 2212 can be designed with more generous dimensional tolerances. Even if the self-locking rings 2211 and 2212 deform or shrink due to excessive operating temperatures, the specified dimensional tolerances ensure the sealing function.

[0027] Referring to Fig. 2 and Fig. 5 The double-sided self-locking piston 22 comprises a playing pass section 222 located from the rear end of the receiving chamber 11; wherein the playing pass section 222 is designed such that a first play exists between it and the inner wall of the receiving chamber 11 and a second play exists between it and the outer wall of the central column 12; wherein a hook groove 2221 is located in the playing pass section 222.

[0028] It is worth noting that the press-pass section 221 of the double-sided self-locking piston 22 is aligned with the rear fluid reservoir 111. Since the press-pass section 221 is self-locking on both sides under hydraulic pressure, a higher frictional force is generated when the rear fluid reservoir 111 is supplied with fluid. If the play-pass section 222 were to remain in contact with the inner wall of the receiving chamber 11 and the outer wall of the central column 12 in this case, the total friction of the double-sided self-locking piston 22 would be too great for movement. Therefore, the play-pass section 222 was designed with a first clearance to the inner wall of the receiving chamber 11 and a second clearance to the outer wall of the central column 12 in order to reduce the friction of the play-pass section 222.This ensures adequate overall friction when advancing the piston, so that both the double-sided self-locking is maintained and smooth movement is enabled.

[0029] Understandably, the playing section 222 is designed such that its outer diameter is smaller than the inner diameter of the receiving chamber 11, in order to create a first clearance between the playing section 222 and the inner wall of the receiving chamber 11. The piston bore of the playing section 222 is provided with a diameter that is larger than the outer diameter of the central column 12, in order to create a second clearance between the piston bore of the playing section 222 and the outer wall of the central column 12.

[0030] Furthermore, the game pass section 222 has a hook groove 2221 which is designed with an L-shaped cross-section to be adapted to the telescopic tube 21.

[0031] Please continue to refer to Fig. 2, Fig. 3 and Fig. 7, wherein the casing pipe assembly 1 comprises the casing pipe main body 13, the casing pipe cover 14 attached to the front end of the casing pipe main body 13, and the liquid supply line 15 attached to the rear end of the casing pipe main body 13; the liquid supply line 15 serves to connect to an external liquid storage tank in order to supply the extendable high-pressure nozzle with washing fluid; the receiving chamber 11 is arranged between the casing pipe main body 13 and the casing pipe cover 14; the central column 12 comprises a mounting part 122 attached to the rear end of the casing pipe main body 13; the mounting part 122 has at least one liquid supply opening 1221; the liquid supply line 15 supplies liquid to the rear liquid storage chamber 111 via the liquid supply opening 1221.

[0032] Refer further to Fig. 4, wherein the telescopic tube assembly 2 comprises a stop disc 23 arranged at the rear end of the telescopic tube 21 and a hook section 24 arranged on the stop disc 23; the stop disc 23 engages with the front end face of the playing pass section 222; the hook section 24 engages with the hook groove 2221.

[0033] Furthermore, the hook section 24 is designed with an L-shaped cross-section to engage with the similarly L-shaped hook groove 2221 and prevent the hook section 24 from detaching from the self-locking piston 22 on both sides. When the extendable high-pressure nozzle is required in the extended position, the front end face of the connecting piece section 222 presses against the stop disc 23, thereby pushing the entire telescopic tube assembly 2 and the spray head 3 forward. When the extendable high-pressure nozzle is required in the retracted position, the stop disc 23 presses against the front end face of the connecting piece section 222, thus returning the entire telescopic tube assembly 2 and the spray head 3 to their initial position.

[0034] With reference to Fig. In other embodiments, the hook groove 2221 has multiple ribs. These ribs are designed to connect the inner wall of the hook groove 2221 to the outer wall, thereby tightening the outer wall of the hook groove 2221. This prevents the play-pass section 222 from deforming towards the inner wall of the receiving chamber 11 under extreme conditions such as temperature fluctuations, uneven force application, or part wear, which would lead to a reduction or loss of the first play. This ensures that the play-pass section 222 retains its friction-reducing effect. Similarly, the hook section 24 is equipped with multiple clearance grooves to bypass the multiple ribs in the hook groove 2221, allowing the hook section 24 to be inserted smoothly into the hook groove 2221 and engage.

[0035] With reference to Fig. 2 and Fig. 4 further comprises a return structure 4, wherein the jacket tube cover 14 comprises a cover body 141, several locking lugs 142 distributed along the circumference of the cover body 141 and a plug connector 143 attached to the rear end of the cover body 141, wherein the jacket tube main body 13 comprises a mounting plate 131 attached to the front end, wherein the mounting plate 131 has several locking grooves 1311, wherein when the plug connector 143 is inserted into the jacket tube main body 13, the locking lugs 142 engage in the locking grooves 1311; wherein the lid body 141 comprises a front stop plate 1411; wherein the return device 4 is arranged on the outside around the telescopic tube 21, wherein the rear end of the return device 4 rests against the stop disc 23 and the front end rests against the front stop plate 1411 via the plug connector 143; wherein the telescopic tube 21 comprises a limiting disc 212; wherein the limiting disc 212 is designed to interact with the front stop plate 1411 to create a limit; wherein the double-sided self-locking piston 22 is in the forward position when the limiting disc 212 comes into contact with the front stop plate 1411.

[0036] Specifically, when a forward force is applied to the casing pipe cover 14, displacement is prevented by the interaction of the locking lug 142 with the locking groove 1311, while when a backward force is applied to the casing pipe cover 14, the movement is limited by the interaction of the cover body 141 with the mounting plate 131. The return mechanism 4 is located between the stop disc 23 and the front stop plate 1411. When the extendable high-pressure nozzle is to be operated in the extended position, the hydraulic thrust must overcome the frictional force of the self-locking piston 22 on both sides as well as the spring force of the return mechanism 4. Therefore, a reduction in the frictional force in the passage section 222 during the extension process promotes the smooth operation of the extendable high-pressure nozzle.When activated in the retracted position, the compressed return mechanism 4 unfolds to retract the telescopic tube assembly 2 and the spray head 3 via the stop disc 23. Consequently, reduced friction in the play section 222 during the retraction process facilitates the smooth retraction of the extendable high-pressure nozzle.

[0037] Furthermore, the arrangement of the limiting disc 212 ensures that, when the telescopic tube 21 reaches its forward position, the limiting disc 212 makes contact with the front stop plate 1411. In this position, the self-locking piston 22 on both sides corresponds exactly with the passage 121, allowing the washing liquid to flow along the Fig. The spray is ejected along the path marked by arrows as soon as the spray head 3 is inevitably ejected.

[0038] It is worth noting that, in this arrangement, the double-sided self-locking piston 22, both in the rear position and during its movement from the rear to the front position, functions as a piston seal. Its purpose is to ensure that the washing fluid cannot be sprayed out before the spray head 3 is fully extended. When the double-sided self-locking piston 22 is in the forward position, it acts as an opening valve, allowing the passage chamber 121 to connect the rear fluid storage chamber 111 and the transition channel 211. The double-sided self-locking piston 22 integrates the functions of the piston seal and the opening valve into a single component, thus saving material costs and reducing the axial length of the entire extendable high-pressure nozzle.

[0039] With reference to Fig. 4 The passage space 121 is designed as at least one fluid guide groove at the front end of the central column 12. The guide groove has a specific length that is greater than the axial dimension of the double self-locking piston 22 to ensure that, when the double self-locking piston 22 is in its forward position, the passage space 121 can connect the rear fluid storage chamber 111 to the transition channel 211 without the double self-locking piston 22 protruding from the front end of the central column 12.

[0040] With reference to Fig. In this embodiment, the front fluid guide groove is provided to be formed multiple times and arranged circumferentially around the front end of the central column 12. This arrangement ensures, firstly, that the flow velocity of the multi-jet washing fluid, which enters the transition channel 211 from the rear fluid storage chamber 111 via the passage chamber 121, is uniform. Secondly, the guide slots are formed by hollowing out portions of the material, while the outer diameter of the front end of the central column 12 remains unchanged. This ensures that the inner self-locking ring 2212 remains in a state supported by the outer wall of the central column 12 in the forward position of the double-sided self-locking piston 22.Since the self-locking piston 22 does not extend from the front end of the central column 12 in its forward position, the inner self-locking ring 2212 is less likely to buckle during the piston's forward and backward movement. However, should the inner self-locking ring 2212 buckle, this could easily lead to leaks.

[0041] With reference to Fig. In further embodiments, the passage 121 is designed such that it is formed by the conical section of the front end of the central column 12. Since the dimensions of the conical section are smaller than those of the inner self-locking ring 2212, the inner self-locking ring 2212 disengages from the conical section when the double-sided self-locking piston 22 is in the forward position, so that the rear fluid storage chamber 111 is connected to the transition channel 211.

[0042] With reference to Fig. 6 In further embodiments, the passage space 121 is formed by offsetting the central column 12 and the self-locking piston 22 on both sides. This means that if the central column 12 is designed with a shorter length, the self-locking piston 22 at the front position disengages from the front end of the central column 12 in order to connect the rear fluid storage chamber 111 with the transition channel 211.

[0043] It is understandable that the passage space 121 can be realized in one or more ways of the aforementioned fluid guide groove, the conical section design or the offset arrangement.

[0044] With reference to Fig. 2 and Fig. 4 The spray head 3 comprises a spray head connection section 31, a spray outlet section 32 arranged at the front end of the spray head connection section 31, and a sealing ring 33 attached to the spray head connection section 31. The sealing ring 33 serves to prevent the washing liquid from escaping at this point, which would lead to a pressure drop during spraying. The spray head connection section 31 has a mounting cavity 311. The front end of the telescopic tube 21 is inserted into the mounting cavity 311 and is in contact with the sealing ring 33. The spray outlet section 32 has a pre-pressure chamber 321 connected to the mounting cavity 311, a secondary pressure chamber 322 connected to the pre-pressure chamber 321, and a water outlet channel 323 connected to the secondary pressure chamber 322.The arrangement of the pre-pressure chamber 321 allows the washing liquid coming from the transition channel 211 to flow in with minimal energy loss and undergoes an initial pressure increase. The arrangement of the secondary pressure chamber 322 subjects the washing liquid to a second pressure increase. The arrangement of the water outlet channel 323 adjusts the spray direction of the washing liquid, causing it to be sprayed in a fan-shaped pattern.

[0045] Furthermore, with reference to Fig. 9 continued, that the front end of the telescopic tube 21 also has several spray head locking elements. The spray head connection section 31 has several spray head locking grooves. The spray head locking elements engage in the spray head locking grooves to allow the spray head 3 to operate stably under high hydraulic pressure.

[0046] With reference to Fig. 2 and Fig. 4 further comprises a heating structure 5; the heating structure 5 comprises at least one heating element 51; the jacket tube assembly 1 further comprises a heating housing 16 which is arranged outside the rear liquid storage space 111; the heating element 51 is arranged in the heating housing 16 to heat the washing liquid in the rear liquid storage space 111.

[0047] Specifically, the heating element 5 of a conventional extendable high-pressure nozzle is usually positioned at the spray head 3. However, since the washing fluid is sprayed out of the spray head 3 at high velocity, the fluid is ejected before it can be heated, resulting in a reduced heating effect. Furthermore, this positioning of the heating element 5 causes problems such as an undesirable increase in the size of the spray head, poor aesthetics, and repeated stress on the heating element 5's lines due to stretching. When the rear fluid reservoir 111 is supplied with fluid, the washing fluid level rises only slowly because the fluid must overcome both the friction of the double-sided self-locking piston 22 and the spring force of the return element 4.This allows the heating structure 5, which is located outside the rear liquid storage chamber 111, a longer heating time, so that the washing fluid reaches a higher temperature. When the warmer washing fluid is sprayed through the spray head 3 in the rear liquid storage chamber 111, it not only heats the spray head 3 and helps to melt the ice on the outer end cap of the spray head 3 as well as the ice in the water outlet channel 323, but also achieves a stronger cleaning effect, thus improving the cleaning function. At the same time, the positioning of the heating structure 5 also solves problems such as the excessively large size of the spray head 3, its unattractive appearance, and the repeated stretching and pulling of the heating structure 5's lines.

[0048] It is worth noting that the heating housing 16 is ring-shaped and has an opening at its rear. The installation of the heating element 51 involves the following steps: Step 1: Stand the jacket tube assembly 1 upright so that the opening of the heating housing 16 points upwards; Step 2: Bend the connecting legs of several heating elements 51 and hang them evenly at the opening of the heating housing 16, so that the body of the heating element 51 lies inside the heating housing 16 and the connecting legs of the heating element 51 lie outside the heating housing 16. Step 3: Pouring thermally conductive adhesive into the heating housing 16. Step 4: Heat the jacket tube assembly 1 so that the thermally conductive adhesive in the heating housing 16 hardens.

[0049] With reference to Fig. 10-12 the sensor arrangement comprises the protruding extendable high-pressure nozzle and further a mounting cover 6 as well as a sensor section 7 arranged inside the mounting cover 6.

[0050] In practical use, the mounting cover 6 is connected to the vehicle. The sensor section 7 is installed in the mounting cover 6 for fixation, enabling it to perform its sensor function. The sensor assembly includes the aforementioned extendable high-pressure nozzle. When the spray head 3 lifts the end cap and is in the extended position, it can spray cleaning fluid and clean the sensor section 7.

[0051] Furthermore, sensor section 7 includes at least one of the following elements: lidar, sensor or camera.

[0052] With reference to Fig.10-12 the mounting cover 6 comprises a sensor section mounting frame 61, two wing plates 62 attached to both sides of the sensor section mounting frame 61 and a nozzle mounting plate 63 attached to the upper or lower end of the sensor section mounting frame 61; wherein the sensor section 7 comprises a sensor surface 71;

[0053] wherein the sensor section 7 is arranged in the sensor section mounting frame 61, wherein the sensor surface 71 protrudes from the sensor section mounting frame 61; the mounting plate 131 is attached to the nozzle mounting plate 63, wherein, in the extended state of the spray head 3, the washing fluid which is sprayed out of the water outlet channel 323 is directed towards the sensor surface 71.

[0054] The above statements refer only to the preferred embodiment of the present invention and should not be construed as limiting the patent claim. The present invention is not limited to the above-mentioned embodiments, the specific structure of which permits modifications. All modifications made within the scope of protection of the independent claims of this invention fall within the scope of protection of this invention.

Claims

[1] Extendable high-pressure nozzle, characterized by , comprising a jacket tube assembly (1), a telescopic tube assembly (2) arranged telescopically in the jacket tube assembly (1) and a spray head (3) attached to the front end of the telescopic tube assembly (2); wherein the casing tube assembly (1) has a receiving chamber (11), wherein the casing tube assembly (1) comprises a central column (12) extending forward from the rear end of the receiving chamber (11), wherein the front end of the central column (12) has at least one passage chamber (121) through which washing liquid can flow; wherein the telescopic tube assembly (2) comprises a telescopic tube (21) and a double-sided self-locking piston (22) attached to the rear end of the telescopic tube (21); wherein the telescopic tube (21) includes an internal transition channel (211); the front end of the central column (12) penetrates the double-sided self-locking piston (22) and enters the transition channel (211); wherein the receiving chamber (11) is separated by the double-sided self-locking piston (22), thereby forming a rear liquid storage chamber (111); wherein, when the rear liquid storage chamber (111) is supplied with liquid, the water pressure via the double-sided self-locking piston (22) pushes the telescopic tube assembly (2) and the spray head (3) from the rear position to the front, thereby ejecting the spray head (3); wherein, when the double-sided self-locking piston (22) is pushed into the front position by the water pressure, the rear liquid storage chamber (111) connects to the transition channel (211) via the passage chamber (121) and the spray head (3) sprays out washing liquid. [2] Extendable high-pressure nozzle according to claim 1, characterized by, that the double-sided self-locking piston (22) comprises a press-fit section (221) arranged near the rear end of the receiving chamber (11); wherein the press-fit section (221) comprises an outer self-locking ring (2211) and an inner self-locking ring (2212); wherein, when the rear liquid storage chamber (111) is supplied with liquid, the outer self-locking ring (2211) deforms towards the inner wall of the receiving chamber (11) and the inner self-locking ring (2212) deforms towards the outer wall of the central column (12). [3] Extendable high-pressure nozzle according to claim 2, characterized by, that the double-sided self-locking piston (22) has a play-pass section (222) located away from the rear end of the receiving space (11); wherein the play-pass section (222) is designed such that a first play exists between it and the inner wall of the receiving space (11) and a second play exists between it and the outer wall of the central column (12); wherein a hook groove (2221) is located in the play-pass section (222). [4] Extendable high-pressure nozzle according to claim 3, characterized bythat the casing pipe assembly (1) comprises a casing pipe main body (13), a casing pipe cover (14) arranged at the front end of the casing pipe main body (13), and a liquid supply line (15) arranged at the rear end of the casing pipe main body (13); wherein the receiving chamber (11) is arranged between the casing pipe main body (13) and the pipe cover (14); wherein the central column (12) comprises a mounting section (122) arranged at the rear end of the casing pipe main body (13); wherein the mounting section (122) has at least one liquid supply opening (1221); wherein the liquid supply line (15) supplies liquid through the liquid supply opening (1221) to the rear liquid storage chamber (111). [5] Extendable high-pressure nozzle according to claim 4, characterized by, that the telescopic tube assembly (2) comprises a stop disc (23) arranged at the rear end of the telescopic tube (21) and a hook section (24) attached to the rear end of the stop disc (23); wherein the stop disc (23) interacts with the front end face of the playing section (222); wherein the hook section (24) interacts with the hook groove (2221); wherein several stiffening ribs are arranged in the hook groove (2221) which are designed to extend from the inner wall to the outer wall of the hook groove (2221). [6] Extendable high-pressure nozzle according to claim 5, characterized by , that it continues to include a reserve structure (4); wherein the casing tube cover (14) comprises a cover body (141), several locking lugs (142) distributed along the circumference of the cover body (141) and a plug connector (143) attached to the rear end of the cover body (141), wherein the casing tube main body (13) comprises a mounting plate (131) attached to the front end, wherein the mounting plate (131) has several locking grooves (1311), wherein when the plug connector (143) is inserted into the casing tube main body (13), the locking lugs (142) engage in the locking grooves (1311); wherein the lid body (141) comprises a front stop plate (1411); wherein the return device (4) is arranged on the outside around the telescopic tube (21), wherein the rear end of the return device (4) rests against the stop disc (23) and the front end rests against the front stop plate (1411) via the plug connector (143). wherein the telescopic tube (21) includes a limiting disc (212); wherein the limiting disc (212) is designed to interact with the front stop plate (1411) to create a limit; wherein the double-sided self-locking piston (22) is in the forward position when the limiting disc (212) comes into contact with the front stop plate (1411). [7] Extendable high-pressure nozzle according to claim 1, characterized by , that the passage space (121) is designed as at least one fluid guide groove which is arranged at the front end of the central column (12). [8] Extendable high-pressure nozzle according to claim 1, characterized by , that the spray head (3) comprises a spray head connection section (31), a spraying section (32) arranged at the front end of the spray head connection section (31) and a sealing ring (33) arranged in the spray head connection section (31); wherein the spray head connection section (31) has a mounting cavity (311); wherein the front end of the telescopic tube (21) is inserted into the mounting cavity (311) and rests against the sealing ring (33); wherein the spray section (32) has a pre-pressure chamber (321) connected to the assembly cavity (311), a secondary pressure chamber (322) connected to the pre-pressure chamber (321) and a water outlet channel (323) connected to the secondary pressure chamber (322). [9] Extendable high-pressure nozzle according to claim 1, characterized by , that it further comprises a heating structure (5); the heating structure (5) comprises at least one heating element (51); the jacket tube assembly (1) further comprises a heating housing (16) arranged outside the rear liquid storage space (111); the heating element (51) is arranged in the heating housing (16) to heat the washing liquid in the rear liquid storage space (111). [10] Sensor arrangement comprising the extendable high-pressure nozzle according to any one of claims 1 to 9, characterized by that it has a mounting cover (6) and a sensor section (7) arranged inside the mounting cover (6); wherein the mounting cover (6) comprises a sensor section mounting frame (61), two wing plates (62) attached to both sides of the sensor section mounting frame (61) and a nozzle mounting plate (63) attached to the upper or lower end of the sensor section mounting frame (61); wherein the sensor section (7) comprises a sensor area (71); wherein the sensor section (7) is arranged in the sensor section mounting frame (61), wherein the sensor surface (71) projects out of the sensor section mounting frame (61); the mounting plate (131) is attached to the nozzle mounting plate (63), wherein, in the extended state of the spray head (3), the washing fluid sprayed from the water outlet channel (323) is directed towards the sensor surface (71).

Images