Fire fighting truck and water supply and drainage cantilever crane thereof

Abstract

The invention discloses a fire fighting truck and a water supply and drainage arm support thereof. The water supply and drainage arm support comprises a multi-stage telescopic pipe and a sealing assembly. The multi-stage telescopic pipe comprises an outer pipe and an inner pipe; the sealing assembly comprises a first end cover, a second end cover and an inflatable lip-shaped sealing ring, the first end cover is detachably connected with the second end cover, the second end cover is arranged on the outer pipe, the inflatable lip-shaped sealing ring comprises a sealing ring body, an air cavity is formed in the sealing ring body, an inflation opening protrudes outwards from the peripheral face or the end face of the other side of the sealing ring body, and the inflation opening is communicated with the air cavity. An inner sealing lip edge is arranged on the end face of one side of the sealing ring body, the inner sealing lip edge extends into a gap between the second end cover and the inner pipe, a concave-convex structure used for sealing is arranged on the inner circumferential face of the sealing ring body, and the concave-convex structure makes contact with the outer circumferential face of the inner pipe. According to the technical scheme, the inflatable lip-shaped sealing ring is adopted, the inner sealing lip edge and the concave-convex structure of the inner circumferential face are combined, a double-sealing mechanism is formed, and liquid in the multi-stage telescopic pipe is effectively prevented from leaking from a gap between the outer pipe and the inner pipe.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of emergency rescue, and in particular to a fire truck and a water supply and drainage boom thereof. BACKGROUND

[0002] With the acceleration of urbanization, special vehicles such as drainage vehicles and fire trucks play an increasingly important role in emergency rescue, municipal maintenance and disaster response. These vehicles are usually equipped with specially designed booms for efficient and flexible water supply or drainage operations.

[0003] The water supply and drainage boom is composed of multiple nested pipes, i.e., the outer pipe and the inner pipe are in sliding cooperation to form a telescopic fluid passage. In the working process, water or other liquids are transmitted through the inside of the boom under high pressure or self-flowing state, thus putting high requirements on the sealing performance between the sections of the boom. The O-ring is used between the outer pipe and the inner pipe of the existing boom, which is difficult to maintain long-term and stable sealing effect under the working environment of high water pressure. SUMMARY

[0004] Therefore, it is necessary to provide a fire truck and a water supply and drainage boom thereof to solve the problem of improving the sealing performance between the outer pipe and the inner pipe of the boom.

[0005] To achieve the above-mentioned purpose, the inventors provide a water supply and drainage boom, comprising: a multi-stage telescopic pipe and a sealing assembly.

[0006] The multi-stage telescopic pipe comprises an outer pipe and an inner pipe, and the inner pipe is slidingly sleeved in the outer pipe.

[0007] The sealing assembly comprises a first end cover, a second end cover and an inflatable lip seal, the first end cover and the second end cover are detachably connected, a containing space for containing the inflatable lip seal is formed between the first end cover and the second end cover, the second end cover is arranged on the outer pipe, the inflatable lip seal comprises a seal body, an air cavity is arranged in the inside of the seal body, an inflation port is protruded outwardly from the outer circumferential surface or the other side end surface of the seal body, the inflation port is communicated to the air cavity, the inflation port passes through the first end cover or the second end cover, an inner sealing lip is arranged on one side end surface of the seal body, the inner sealing lip extends into the gap between the second end cover and the inner pipe, a concave-convex structure for sealing is arranged on the inner circumferential surface of the seal body, and the concave-convex structure is in contact with the outer circumferential surface of the inner pipe.

[0008] Further, the second end cover comprises an end cover body and a first guide sleeve, the second end cover is detachably connected with the first end cover through the end cover body, an inner peripheral surface of the end cover body is provided with a second positioning groove, the first guide sleeve is sleeved in the second positioning groove, an inner peripheral surface of the first guide sleeve is provided with a first positioning groove, and the inner sealing lip of the inflatable lip-shaped sealing ring extends into a gap between the inner peripheral surface of the first guide sleeve and the inner tube.

[0009] The multi-stage telescopic pipe further comprises a first wear-resistant piece, a second guide sleeve and a second wear-resistant piece.

[0010] The first wear-resistant piece is sleeved in the first positioning groove and is in sliding connection with the inner tube.

[0011] The second guide sleeve is sleeved on an outer peripheral surface of the inner tube and is located in the outer tube, an outer peripheral surface of the second guide sleeve is provided with a third positioning groove, the second wear-resistant piece is arranged in the third positioning groove and is in sliding connection with an inner peripheral surface of the outer tube; or,

[0012] The second guide sleeve is sleeved on an inner peripheral surface of the outer tube and is located in the outer tube, an inner peripheral surface of the second guide sleeve is provided with a third positioning groove, and the second wear-resistant piece is arranged in the third positioning groove and is in sliding connection with an outer peripheral surface of the inner tube.

[0013] Further, the second end cover further comprises a transition ring, the transition ring is clamped between an end surface of the first end cover and an end surface of the end cover body, the first guide sleeve extends out of the end surface of the end cover body, the transition ring is sleeved on an outer periphery of the first guide sleeve, the transition ring and the first guide sleeve are in contact with an end surface where the inner sealing lip of the inflatable lip-shaped sealing ring is located, and a shape of the transition ring is matched with a shape of a part of the inflatable lip-shaped sealing ring except the inner sealing lip.

[0014] Further, one side end surface of the sealing ring body is further provided with an outer sealing lip, the outer sealing lip and the inner sealing lip are located on the same side end surface of the sealing ring body, the outer sealing lip is located outside the inner sealing lip, and the transition ring is provided with a groove accommodating the outer sealing lip of the inflatable lip-shaped sealing ring.

[0015] Further, a second sealing ring is further included, and the second sealing ring is arranged between the transition ring and the end surface of the end cover body.

[0016] Further, an end surface of the sealing ring body is provided with a positioning lip.

[0017] The positioning lip and the inner sealing lip are located on the same side end surface of the sealing ring body, and the positioning lip is located outside the inner sealing lip; or,

[0018] The positioning lip and the inner sealing lip are located at the opposite ends of the sealing ring body.

[0019] Further, the inner circumferential surface of the sealing ring body is concave to the outer circumferential surface of the sealing ring body before the inflatable lip-shaped sealing ring is inflated; and / or,

[0020] The concave-convex structure includes three annular convex rings arranged in sequence along the axial direction of the sealing ring body.

[0021] Further, it further includes a lower support cylinder, a left water delivery pipe, a right water delivery pipe and a lifting mechanism.

[0022] The lower support cylinder is located below the outer pipe, the left water outlet of the lower support cylinder is connected with the water inlet of the left water delivery pipe, the water outlet of the left water delivery pipe is connected with the left water inlet of the outer pipe, the right water outlet of the lower support cylinder is connected with the water inlet of the right water delivery pipe, and the water outlet of the right water delivery pipe is connected with the right water inlet of the outer pipe.

[0023] The left water inlet of the outer pipe is rotatable relative to the water outlet of the left water delivery pipe, the right water inlet of the outer pipe is rotatable relative to the water outlet of the right water delivery pipe, and the third sealing ring is arranged between the left water inlet of the outer pipe and the water outlet of the left water delivery pipe and between the right water inlet of the outer pipe and the water outlet of the right water delivery pipe, respectively; or, the water inlet of the left water delivery pipe is rotatable relative to the left water outlet of the lower support cylinder, the water inlet of the right water delivery pipe is rotatable relative to the right water outlet of the lower support cylinder, and the third sealing ring is arranged between the water inlet of the left water delivery pipe and the left water outlet of the lower support cylinder and between the water inlet of the right water delivery pipe and the right water outlet of the lower support cylinder, respectively.

[0024] One end of the lifting mechanism is connected with the outer pipe, and the other end is directly or indirectly connected with the lower support cylinder, for adjusting the pitch of the outer pipe.

[0025] Further, the third sealing ring is a Glay ring.

[0026] Further, it further includes a fire monitor, the fire monitor is connected with the water outlet of the inner pipe, and the water outlet of the inner pipe extends out of the outer pipe.

[0027] To achieve the above-mentioned purpose, the inventor also provides a fire truck, comprising: a chassis, a fire pump and a water supply and discharge arm support.

[0028] The engine of the chassis provides power for the fire pump, the fire pump is connected with the outer pipe of the water supply and discharge arm support through a pipeline, and the water supply and discharge arm support is the water supply and discharge arm support described in the above-mentioned embodiments.

[0029] Different from the prior art, the technical scheme adopts the inflatable lip-shaped sealing ring, combines the concave-convex structure of the inner sealing lip edge and the inner peripheral surface, forms a double sealing mechanism, effectively prevents the liquid in the multi-stage telescopic pipe from leaking from the gap between the outer pipe and the inner pipe, and is especially suitable for high-pressure water supply harsh working conditions.

[0030] The above content is only a summary of the technical scheme of the present application. In order to enable those skilled in the art to more clearly understand the technical scheme of the present application, and then can be implemented according to the content of the description and the drawings, and in order to let the above-mentioned purpose and other purposes, characteristics and advantages of the present application can be more easily understood, the following is described in combination with the specific embodiments and the drawings of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0031] The drawings are only used to show the principles, implementation modes, applications, characteristics and effects of the specific embodiments of the present application and other related contents, and cannot be considered as a limitation of the present application.

[0032] Figure 1 is a schematic view of the water supply and drainage arm support in the present application;

[0033] Figure 2 is Figure 1 is an enlarged schematic view of part A in the present application;

[0034] Figure 3 is a schematic view of the inflatable lip-shaped sealing ring in the present application;

[0035] Figure 4 is Figure 3 is an enlarged schematic view of part B in the present application;

[0036] Figure 5 is a schematic view of the water supply and drainage arm support in the present application;

[0037] Figure 6 is Figure 5 is an enlarged schematic view of part C in the present application;

[0038] Figure 7 is Figure 5 is an enlarged schematic view of part D in the present application;

[0039] Figure 8 is a schematic view of the outer pipe, the lower support cylinder, the left water conveying pipe and the right water conveying pipe in the present application;

[0040] Figure 9 is Figure 8 is an enlarged schematic view of part E in the present application;

[0041] Figure 10 is a schematic view of the fire fighting truck and its water supply and drainage arm support in the present application.

[0042] BRIEF DESCRIPTION OF DRAWINGS:

[0043] 1. A sealing assembly;

[0044] 11. A first end cover;

[0045] 12. A second end cover; 121, an end cover body; 122, a first guide sleeve; 123, a transition ring; 124, a second positioning groove; 125, a fourth positioning groove;

[0046] 13. A sealing ring body; 131, an inflation port; 132, an air cavity; 133, an inner sealing lip; 134, an outer sealing lip; 135, a positioning lip; 136, an annular convex ring; 137, a sealing groove; 138, a positioning groove;

[0047] 14. A second sealing ring;

[0048] 15. A first wear-resistant piece; 151, a first positioning groove;

[0049] 16. A second guide sleeve;

[0050] 17. A second wear-resistant piece; 171, a third positioning groove;

[0051] 18. A third sealing ring; 181, a second O-ring; 182, a wear-resistant ring;

[0052] 19. A bearing;

[0053] 2. A multi-stage telescopic pipe; 21, an outer pipe; 22, an inner pipe; 23, a left water inlet; 24, a right water inlet;

[0054] 3. A fire monitor;

[0055] 4. A lower support cylinder; 41, a left water outlet; 42, a right water outlet;

[0056] 5. A left water delivery pipe;

[0057] 6. A right water delivery pipe; 61, a water outlet;

[0058] 7. A rotating mechanism;

[0059] 8. A base plate;

[0060] 9. A lifting mechanism;

[0061] 100. A fire pump. DETAILED DESCRIPTION

[0062] To explain possible application scenarios, technical principles, specific implementation schemes, and the purposes and effects of the present application in detail, the following embodiments are described in conjunction with the accompanying drawings. The embodiments described herein are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0063] In this paper, the term "embodiment" means that the specific features, structures or characteristics described in conjunction with the embodiment can be included in at least one embodiment of the present application. The term "embodiment" appearing at various places in the specification does not necessarily refer to the same embodiment, and does not particularly limit its independence or association with other embodiments. In principle, in the present application, as long as there is no technical contradiction or conflict, each technical feature mentioned in each embodiment can be combined in any way to form a corresponding implementable technical solution.

[0064] Unless otherwise defined, the meaning of the technical terms used herein is the same as that generally understood by those skilled in the art to which the present application belongs; the use of related terms herein is only for the purpose of describing specific embodiments, and is not intended to limit the present application.

[0065] In the description of the present application, the phrase "and / or" is a description of the logical relationship between the objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases: A exists, B exists, and A and B exist at the same time. In addition, the character " / " in this paper generally represents that the associated objects before and after are a "or" logical relationship.

[0066] In the present application, terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual quantity, primary and secondary or order relationship between the entities or operations.

[0067] Without more limitations, in the present application, the phrases "include", "contain", "have" or other similar expressions used in the sentence are intended to cover non-exclusive inclusion, and these expressions do not exclude the presence of other elements in the process, method or product including the described elements, so that the process, method or product including a series of elements can not only include those limited elements, but also include other elements not explicitly listed, or also include elements inherent to such process, method or product.

[0068] In the present application, "greater than", "less than", "exceed" and the like are understood as not including the number; "above", "below", "within" and the like are understood as including the number. In addition, in the description of the embodiments of the present application, the meaning of "multiple" is more than two (including two), and similar expressions related to "multiple" are also understood in this way, for example, "multiple groups", "multiple times" and the like, unless otherwise explicitly specified.

[0069] In the description of the embodiments of the present application, the spatially related expressions used, such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "perpendicular", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiments or the drawings, and are only for the convenience of describing the specific embodiments of the present application or for the reader to understand, and do not indicate or imply that the indicated device or component must have a particular position, a particular orientation, or be constructed or operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0070] Unless otherwise explicitly specified or limited, in the description of the embodiments of the present application, the terms "mount", "connect", "connect", "fix", "set", and the like should be broadly understood. For example, the "connection" can be fixed connection, or detachable connection, or integral setting; it can be mechanical connection, or electrical connection, or communication connection; it can be directly connected, or indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art to which the present application belongs, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0071] Please refer to Figures 1 to 10 The present embodiment provides a water supply and drainage arm support, comprising: a multi-stage telescopic pipe 2 and a sealing assembly 1;

[0072] The multi-stage telescopic pipe 2 comprises an outer pipe 21 and an inner pipe 22, and the inner pipe 22 is slidingly sleeved in the outer pipe 21;

[0073] The sealing assembly 1 comprises a first end cover 11, a second end cover 12 and an inflatable lip seal. The first end cover 11 is detachably connected with the second end cover 12, and a containing space for containing the inflatable lip seal is formed between the first end cover 11 and the second end cover 12. The second end cover 12 is arranged on the outer tube 21. The inflatable lip seal comprises a seal body 13. An air cavity 132 is arranged in the interior of the seal body 13. An inflatable port 131 is outwardly protruded from the outer circumferential surface or the other side end surface of the seal body 13. The inflatable port 131 is communicated with the air cavity 132 and penetrates through the first end cover 11 or the second end cover 12. An inner sealing lip 133 is arranged on one side end surface of the seal body 13 and extends into the gap between the second end cover 12 and the inner tube 22. A concave-convex structure for sealing is arranged on the inner circumferential surface of the seal body 13 and is in contact with the outer circumferential surface of the inner tube 22.

[0074] The multi-stage telescopic tube 2 is a component composed of a plurality of nested tubes and generally comprises an outer tube 21 and an inner tube 22. Each tube can be slid and telescoped layer by layer to adapt to different working height or distance requirements. For the convenience of description, only a two-stage structure comprising the outer tube 21 and the inner tube 22 is taken as an example for description herein, but this does not mean that the multi-stage telescopic tube 2 is limited to two stages. In fact, according to actual application scenarios and performance requirements, the structure can be extended to a three-stage telescopic tube, a four-stage telescopic tube, a five-stage telescopic tube or even more stages, all of which belong to the protection scope and technical concept of the present application.

[0075] The inflatable lip seal is made of elastic material and has a whole annular structure. Compressed gas can be filled into the air cavity 132 through the inflatable port 131 by an external gas source (such as a small air pump or a vehicle-mounted gas supply system), so that the whole seal body is controllably inflated, the containing space between the first end cover 11 and the second end cover 12 is filled, and the annular gap between the outer tube 21 and the inner tube 22 is effectively blocked to prevent water leakage.

[0076] Specifically, the inner sealing lip 133 is located in the axial gap between the second end cover 12 and the inner tube 22 and faces the water flow direction. When water seeps along the outer wall of the inner tube 22 into this area, the water flow pressure acts on the inner sealing lip 133, so that the inner sealing lip 133 is more tightly attached to the outer circumferential surface of the inner tube 22, thereby enhancing the sealing effect. This structure utilizes the pressure of the leakage medium itself to achieve self-tightening sealing. The concave-convex structure, such as a plurality of annular ridges, sawtooth-like lines or wave-like undulating structures, is in contact with the outer circumferential surface of the inner tube 22 in the inflated state of the seal body, forming a multi-point or continuous contact seal to improve the sealing reliability.

[0077] In this way, the inflatable lip seal, in combination with the inner sealing lip 133 and the concave-convex structure of the inner circumferential surface, forms a double sealing mechanism, effectively preventing the liquid in the multi-stage telescopic tube 2 from leaking from the gap between the outer tube 21 and the inner tube 22, and is especially suitable for high-pressure water supply in harsh working conditions.

[0078] Referring to Figures 2 to 4 In some embodiments, the inner sealing lip 133 is located at the intersection of the side end face and the inner circumferential face of the sealing ring body 13, which is convenient for the inner sealing lip 133 to be formed. When inflated, the inner sealing lip 133 is quickly unfolded and adheres to the outer wall of the inner tube 22.

[0079] Referring to Figures 2 to 7 In some embodiments, the second end cover 12 includes an end cover body 121 and a first guide sleeve 122, the second end cover 12 is detachably connected with the first end cover 11 through the end cover body 121, the inner circumferential face of the end cover body 121 is provided with a second positioning groove 124, the first guide sleeve 122 is sleeved in the second positioning groove 124, the inner circumferential face of the first guide sleeve 122 is provided with a first positioning groove 151, and the inner sealing lip 133 of the inflatable lip-shaped sealing ring extends into the gap between the inner circumferential face of the first guide sleeve 122 and the inner tube 22.

[0080] The multi-stage telescopic tube further includes a first wear-resistant piece 15, a second guide sleeve 16 and a second wear-resistant piece 17.

[0081] The first wear-resistant piece 15 is sleeved in the first positioning groove 151 and is in sliding connection with the inner tube 22.

[0082] The second guide sleeve 16 is sleeved on the outer circumferential face of the inner tube 22 and is located in the outer tube 21, the outer circumferential face of the second guide sleeve 16 is provided with a third positioning groove 171, and the second wear-resistant piece 17 is arranged in the third positioning groove 171 and is in sliding connection with the inner circumferential face of the outer tube 21.

[0083] Generally, the end cover body 121 serves as the main body of the second end cover 12, the second end cover 12 is welded on the port of the outer tube 21 through the end cover body 121 and is assembled with the first end cover 11 through the end cover body 121. The second end cover 12 is internally provided with the second positioning groove 124, the first guide sleeve 122 can be inserted into the second positioning groove 124 and abut against the side wall of the second positioning groove 124, thereby achieving quick positioning and reliable installation.

[0084] The first guide sleeve 122 is arranged on the side of the end cover body 121 close to the first end cover 11 and is adjacent to the inflatable lip-shaped sealing ring, and the annular gap between the first guide sleeve 122 and the inner tube 22 is at the end of the liquid leakage path. The inner sealing lip 133 extending into the gap between the inner circumferential face of the first guide sleeve 122 and the inner tube 22 can form an effective seal.

[0085] The first guide sleeve 122 and the second guide sleeve 16 are used to fix the first wear-resistant part 15 and the second wear-resistant part 17. The first guide sleeve 122 is located at the position where the outer tube 21 is provided with the port for the inner tube 22 to extend into, and the second guide sleeve 16 is located in the inner tube 22. The first guide sleeve 122 and the second guide sleeve 16 are spaced apart at a certain distance to form a front-and-back double-support guiding structure. The first wear-resistant part 15 and the second wear-resistant part 17 are preferably made of polytetrafluoroethylene (PTFE), polyoxymethylene (POM), or copper-based self-lubricating material, which has a low friction coefficient and high wear resistance. The first wear-resistant part 15 and the second wear-resistant part 17 protrude from the first positioning groove 151 and the third positioning groove 171 to keep the wear-resistant part in effective contact with the inner and outer tubes 21, thereby realizing stable sliding fit. Through the guiding structure of the front-and-back double guide sleeves and wear-resistant parts, the inner tube 22 is coaxially arranged with the outer tube 21 as much as possible, so as to ensure that the inner tube 22 always moves horizontally along the axial direction and avoid sagging of the inner tube 22.

[0086] In some other embodiments, the second guide sleeve 16 and the second wear-resistant part 17 can be assembled in the following manner. The second guide sleeve 16 is sleeved on the inner circumferential surface of the outer tube 21 and located in the outer tube 21. The inner circumferential surface of the second guide sleeve 16 is provided with the third positioning groove 171, and the second wear-resistant part 17 is arranged in the third positioning groove 171 and in sliding connection with the outer circumferential surface of the inner tube 22.

[0087] Please refer to Figure 2 and Figure 6 In some embodiments, the second end cover 12 further comprises a transition ring 123 clamped between the end surface of the first end cover 11 and the end surface of the end cover body 121. The first guide sleeve 122 protrudes outward from the end surface of the end cover body 121. The transition ring 123 is sleeved on the outer periphery of the first guide sleeve 122. The transition ring 123 and the first guide sleeve 122 together contact the end surface where the inner sealing lip 133 of the inflatable lip-shaped sealing ring is located. The shape of the transition ring 123 is adapted to the shape of the part of the inflatable lip-shaped sealing ring except the inner sealing lip 133. The transition ring 123 is arranged to adapt to the inflatable lip-shaped sealing ring, which not only facilitates disassembly but also maintains good sealing effect.

[0088] Please refer to Figure 2 and Figure 6 Preferably, the outer circumferential surface of the first guide sleeve 122 is provided with a fourth positioning groove 125. The transition ring 123 can be inserted into the fourth positioning groove 125 and abut against the sidewall of the fourth positioning groove 125. Alternatively, the transition ring 123 can be directly sleeved on the outer periphery of the first guide sleeve 122 and limited by the end cover body 121.

[0089] Figure 2As shown, the inflatable lip seal is located on the left side, and the right end face of the inflatable lip seal has an inner sealing lip 133 extending downward to the right. The transition ring 123 and the first guide sleeve 122 are located on the right side, and the left end faces of both are in contact with the right end face of the inflatable lip seal. The first guide sleeve 122 is closer to the central axis of the outer tube 21, but its radial width is smaller than that of the transition ring 123, so it only contacts a small area of the right end face of the seal near the inner ring. The main body area of the right end face of the inflatable lip seal is in contact with and supported by the transition ring 123, achieving uniform pressure on a large area; while the local area near the inner ring is in contact with the end face of the first guide sleeve 122. The inner sealing lip 133 extends inward from this contact area into the annular gap between the first guide sleeve 122 and the inner tube 22, achieving axial sealing of the leakage path.

[0090] Referring to Figure 2 and Figure 6 In some embodiments, the end cover body 121 of the first end cover 11 and the second end cover 12 are connected by a flange. The transition ring 123 is clamped between the first end cover 11 and the second end cover 12 (end cover body 121) and extends to the bolt hole position of the flange connection. The transition ring 123 not only supports and positions the inflatable lip seal, but also serves as part of the flange connection, so that the bolts of the flange connection pass through the corresponding bolt holes of the end cover body 121, the transition ring 123, and the first end cover 11 in turn, achieving tight fixation of the three.

[0091] Referring to Figures 2 to 4 、 Figure 6 In some embodiments, the side end face of the seal body 13 is also provided with an outer sealing lip 134, and the outer sealing lip 134 and the inner sealing lip 133 are located on the same side end face of the seal body 13, with the outer sealing lip 134 located outside the inner sealing lip 133. The transition ring 123 is provided with a sealing groove 137 accommodating the outer sealing lip 134 of the inflatable lip seal. The outer sealing lip 134 and the inner sealing lip 133 are in a figure-eight shape, Figure 2 As shown, the right end face of the inflatable lip seal has an inner sealing lip 133 and an outer sealing lip 134, with the inner sealing lip 133 extending downward to the right and the outer sealing lip 134 extending upward to the right.

[0092] When water flows out along the gap between the inner tube 22 and the outer tube 21 and reaches the position of the inflatable lip seal, the water flow pressure not only acts on the inner sealing lip 133, pushing it to fit more closely to the outer peripheral surface of the inner tube 22 and enhancing the sealing effect on the inner side; at the same time, the pressure also acts on the outer sealing lip 134, causing it to deform under pressure and tightly press against the inner wall of the sealing groove 137 of the transition ring 123 (i.e. allowing the outer sealing lip to contact and seal with the second end cover), forming an additional sealing barrier.

[0093] It should be noted that the structure of the one side end face of the sealing ring body 13 and its matching relationship with the matching components can be adjusted accordingly to optimize the sealing performance according to the specific design of the seal.

[0094] If the one side end face of the sealing ring body 13 is provided with only the inner sealing lip 133 without the outer sealing lip 134, the remaining area of the end face except the inner sealing lip 133 is preferably flat. Correspondingly, the part of the transition ring 123 in contact with the end face is also preferably designed as a flat surface to achieve uniform and large-area fitting and improve the sealing stability.

[0095] If the same side end face of the sealing ring body 13 is provided with both the inner sealing lip 133 and the outer sealing lip 134 located outside it, the corresponding area of the transition ring 123 needs to be provided with a sealing groove 137, which is shaped to match the profile of the outer sealing lip 134 in the inflated state, allowing the outer sealing lip 134 to be embedded therein to form a tight contact.

[0096] If the second end cover 12 is not provided with the transition ring 123, the sealing groove 137 described above for accommodating the outer sealing lip 134 can be directly provided on the corresponding end face of the end cover body 121 or the first guide sleeve 122 to achieve the same function. In a more simplified structure, if the second end cover 12 is neither provided with the transition ring 123 nor the first guide sleeve 122, the sealing groove 137 described above can be directly provided on the end cover body 121 for cooperation with the outer sealing lip 134 to ensure accurate positioning and effective sealing.

[0097] Please refer to Figure 2 and Figure 6 In some embodiments, the sealing assembly further comprises a second sealing ring 14 arranged between the transition ring 123 and the end face of the end cover body 121. Due to the presence of the first guide sleeve 122, the transition ring 123, and the end cover body 121 on the same side of the inflated sealing ring, there are inevitable assembly gaps between these components, such as the gap between the transition ring 123 and the end cover body 121, the gap between the first guide sleeve 122 and the transition ring 123, and the gap between the first guide sleeve 122, the transition ring 123, and the end cover body 121. When the water supply and drainage arm is operated under high pressure conditions, the internal water flow may first penetrate outward through the gap between the transition ring 123 and the end cover body 121, and then further leak through the cooperation gap between the first guide sleeve 122, the transition ring 123, and the end cover body 121, and finally leak to the outside of the sealing assembly 1 through the gap between the transition ring 123 and the end cover body 121. By arranging the second sealing ring 14, the end of this leakage path is effectively sealed.

[0098] Please refer to Figure 2 and Figure 6Preferably, the end face of the end cover body 121 is provided with an O-shaped groove accommodating the second sealing ring 14. The second sealing ring 14 is a first O-shaped ring, which can be made of nitrile rubber (NBR), fluororubber (FKM) or silicone rubber (VMQ), and has good elasticity, water resistance, pressure resistance and aging resistance. After the first O-shaped ring is embedded in the O-shaped groove, part of its outer surface protrudes from the end face of the end cover body 121. When the transition ring 123 is compressed, the first O-shaped ring is compressed to produce elastic deformation, filling the gap between the end face of the transition ring 123 and the end cover body 121. It should be noted that the position of the O-shaped groove is not unique, and the position of the O-shaped groove can be flexibly interchanged between the end cover body 121 and the transition ring 123.

[0099] Please refer to Figures 2 to 4 , Figure 6 In some embodiments, the end face of the sealing ring body 13 is provided with a positioning lip 135.

[0100] The positioning lip 135 and the inner sealing lip 133 are located on the same side end face of the sealing ring body 13, and the positioning lip 135 is located outside the inner sealing lip 133; or,

[0101] The positioning lip 135 and the inner sealing lip 133 are located on the opposite end faces of the sealing ring body 13.

[0102] The positioning lip 135 can be provided on the same side or opposite side of the end face of the inner sealing lip 133, forming various optional embodiments. Preferably, both sides of the sealing ring body 13 are provided with a positioning lip 135, which is close to the outer periphery of the sealing ring, as shown in Figure 4 .

[0103] The first end cover 11 and the second end cover 12 are provided with a positioning groove 138 matched with the positioning lip 135, which is adapted in shape and size to the positioning lip 135, so that it can be embedded and limited. In the installation process, first, the positioning lip 135 of the inflatable lip-shaped sealing ring is aligned and placed in the positioning groove 138 on the first end cover 11 and the second end cover 12 to achieve precise positioning; then the inflation operation is performed. This structure can effectively prevent the sealing ring from moving during inflation, and improve the assembly consistency.

[0104] Please refer to Figures 2 to 4 , Figure 6 In some embodiments, the positioning lip 135 is located at the junction of the end face and the outer peripheral surface of the sealing ring body 13, which is convenient to manufacture, and the positioning lip 135 first contacts the positioning groove hole of the first end cover 11 or the second end cover 12 during assembly, which is far away from the main sealing area and does not interfere with the deformation process of the inner sealing lip 133.

[0105] If the second end cover 12 is provided with the transition ring 123, and the same side end face of the sealing ring body 13 is provided with the positioning lip 135 and the inner sealing lip 133, a positioning groove 138 is arranged on the transition ring 123 corresponding to the position of the positioning lip 135. Since the positioning lip 135 is preferably located at the junction of the outer peripheral surface and the end face, the first end cover 11 contacts the outer peripheral surface of the sealing ring body 13, one side wall of the positioning groove 138 is formed by the inner end face of the first end cover 11, and the other side wall is formed by the end face of the transition ring 123. When the transition ring 123 is not provided, the positioning groove 138 can be arranged on the end cover body 121 corresponding to the position of the positioning lip 135.

[0106] If the sealing ring body 13 is provided with the positioning lip 135 on the end face opposite to the inner sealing lip 133, the positioning groove 138 is directly arranged on the corresponding end face of the first guide sleeve 122 for cooperation with the positioning lip 135.

[0107] Please refer to Figure 4 In some embodiments, the inner peripheral surface of the sealing ring body 13 is concave to the outer peripheral surface of the sealing ring body 13 before the inflatable lip seal is inflated, leaving a compensation allowance for inflation to provide deformation space for inflation. After the compressed gas is injected into the sealing ring through the inflation port 131, the sealing ring expands radially as a whole, the concave surface gradually flattens and finally tightly adheres to the outer peripheral surface of the inner tube 22, forming a circumferential seal.

[0108] Please refer to Figure 4 In some embodiments, the concave-convex structure includes three annular convex rings 136 arranged in sequence along the axial direction of the sealing ring body 13. The inflatable lip seal forms multiple-point contact with the outer peripheral surface of the inner tube 22 after inflation, achieving multiple sealing.

[0109] Please refer to Figure 4 Preferably, the end portions of each annular convex ring 136 near the inner peripheral surface of the sealing ring are located at the same axial position in the radial direction, and the multiple annular convex rings 136 can substantially simultaneously contact the surface of the inner tube 22 at the initial stage of expansion, achieving synchronous sealing. Although in the embodiment in which the inner peripheral surface of the sealing ring body 13 is concave to the outer peripheral surface of the sealing ring, the height of the convex portion of each annular convex ring 136 is adjusted to ensure that the end portions are flush. Of course, it is also allowed that the end portions of the multiple annular convex rings 136 near the inner peripheral surface have a difference in height, i.e., the end portions are not at the same radial height.

[0110] It should be noted that the number of annular convex rings 136 is not limited to three, but can be flexibly adjusted according to actual working conditions, and three or more annular convex rings (such as four or five) can be arranged to form multiple sealing bands, or one or two annular convex rings can also be arranged.

[0111] Please refer toFigure 5 、 Figure 8 and Figure 10 In some embodiments, the water supply and discharge arm support further comprises a lower support cylinder 4, a left water supply pipe 5, a right water supply pipe 6 and a lifting mechanism 9.

[0112] The lower support cylinder 4 is located below the outer pipe 21, the left water outlet 41 of the lower support cylinder 4 is connected with the water inlet of the left water supply pipe 5, the water outlet of the left water supply pipe 5 is connected with the left water inlet 23 of the outer pipe 21, the right water outlet 42 of the lower support cylinder 4 is connected with the water inlet of the right water supply pipe 6, and the water outlet of the right water supply pipe 6 is connected with the right water inlet 24 of the outer pipe 21.

[0113] The left water inlet 23 of the outer pipe 21 is rotatable relative to the water outlet of the left water supply pipe 5, the right water inlet 24 of the outer pipe 21 is rotatable relative to the water outlet of the right water supply pipe 6, and the third sealing ring 18 is arranged between the left water inlet 23 of the outer pipe 21 and the water outlet of the left water supply pipe 5, and between the right water inlet 24 of the outer pipe 21 and the water outlet of the right water supply pipe 6, respectively; or, the water inlet of the left water supply pipe 5 is rotatable relative to the left water outlet 41 of the lower support cylinder 4, the water inlet of the right water supply pipe 6 is rotatable relative to the right water outlet 42 of the lower support cylinder 4, and the third sealing ring 18 is arranged between the water inlet of the left water supply pipe 5 and the left water outlet 41 of the lower support cylinder 4, and between the water inlet of the right water supply pipe 6 and the right water outlet 42 of the lower support cylinder 4, respectively.

[0114] One end of the lifting mechanism 9 is connected with the outer pipe 21, and the other end is directly or indirectly connected with the lower support cylinder 4, for adjusting the pitch of the outer pipe 21.

[0115] The outer pipe 21 is located at the top, the left water supply pipe 5 and the right water supply pipe 6 are located in the middle and symmetrically arranged, and the lower support cylinder 4 is located at the bottom. The water flow is sent from the external water source into the water inlet of the lower support cylinder 4. Since the lower support cylinder 4 has two water outlets, one way of water flow flows out from the left water outlet 41 of the lower support cylinder 4 and enters the water inlet of the left water supply pipe 5, and the other way of water flow flows out from the right water outlet 42 of the lower support cylinder 4 and enters the water inlet of the right water supply pipe 6. The water flow is respectively conveyed to the left water inlet 23 and the right water inlet 24 of the outer pipe 21 through the left water supply pipe 5 and the right water supply pipe 6, and then flows into the inner part of the outer pipe 21. The water inlet of the inner pipe 22 can slide and stretch in the outer pipe 21. Finally, the water flow is transmitted to the distal end of the inner pipe 22 (i.e. the end away from the outer pipe 21) through the inner pipe 22, and discharged from the water outlet of the inner pipe 22, for water supply, water discharge or connection with the fire monitor 3.

[0116] The left water supply pipe 5 and the right water supply pipe 6 are respectively symmetrically arranged on the left side and the right side of the outer pipe 21. The symmetric double-pipe structure evenly distributes the support force that may be concentrated on one side to the left and right sides of the arm support, thereby reducing the probability of structural deformation.

[0117] As the outer tube 21 can rotate up and down, the water outlet of the multi-stage telescopic pipe 2 rotates up at the front end. There are two ways to rotate, one is that the left water inlet 23 of the outer tube 21 can rotate relative to the water outlet of the left water delivery pipe 5, and the right water inlet 24 of the outer tube 21 can rotate relative to the water outlet of the right water delivery pipe 6, and the other is that the water inlet of the left water delivery pipe 5 can rotate relative to the left water outlet 41 of the lower support cylinder 4, and the water inlet of the right water delivery pipe 6 can rotate relative to the right water outlet 42 of the lower support cylinder 4, so a third sealing ring 18 is arranged at the rotating position to prevent water leakage.

[0118] Direct connection between the lower support cylinder 4 and the lifting mechanism 9 means that one end of the lifting mechanism 9 is directly mounted on the mounting point provided on the lower support cylinder 4. Indirect connection means that the lifting mechanism 9 is connected through the mounting point on other components fixedly connected with the lower support cylinder 4. These components can be the rotating mechanism 7 for supporting and driving the lower support cylinder 4 to rotate, or the chassis 8, but not directly connected to the lower support cylinder 4. At this time, the lower support cylinder 4 is fixed to the rotating mechanism 7, and driving the rotating mechanism 7 can drive the multi-stage telescopic pipe 2, the lifting mechanism 9 and the lower support cylinder 4 to rotate together.

[0119] Please refer to Figure 9 In some embodiments, the third sealing ring 18 is a GORE-SEAL. The GORE-SEAL includes a wear-resistant ring 182 and a second O-ring 181 arranged on the outer circumferential surface of the wear-resistant ring 182. Generally, the second O-ring 181 is a rubber O-ring, which serves as an elastic support to apply a radial pre-tightening force to the wear-resistant ring 182. The wear-resistant ring 182 is a polytetrafluoroethylene ring, which can be arranged on the corresponding port by interference fit. Such a structure can significantly improve the sealing performance and reliability of the arm rotating part under high pressure and dynamic oscillation conditions.

[0120] The specific installation structure of the GORE-SEAL is described in the implementation mode that the left water inlet 23 of the outer tube 21 can rotate relative to the water outlet of the left water delivery pipe 5, and the right water inlet 24 of the outer tube 21 can rotate relative to the water outlet 61 of the right water delivery pipe 6. If the outer side wall of the left water inlet 23 of the outer tube 21 extends into the inner side wall of the water outlet of the left water delivery pipe 5, and the outer side wall of the right water inlet 24 of the outer tube 21 extends into the inner side wall of the water outlet 61 of the right water delivery pipe 6, in the GORE-SEAL on the left side, the wear-resistant ring 182 is in contact with the outer side wall of the left water inlet 23 of the outer tube 21, and the second O-ring 181 is in contact with the inner side wall of the water outlet of the left water delivery pipe 5, and in the GORE-SEAL on the right side, please refer to Figure 9 , the wear-resistant ring 182 is in contact with the outer side wall of the right water inlet 24 of the outer tube 21, and the second O-ring 181 is in contact with the inner side wall of the water outlet 61 of the right water delivery pipe 6.

[0121] In some embodiments, if the outer side wall of the left water inlet 23 of the outer pipe 21 extends into the inner side wall of the water outlet of the left water delivery pipe 5, and the outer side wall of the right water inlet 24 of the outer pipe 21 extends into the inner side wall of the water outlet of the right water delivery pipe 6, bearings 19 are arranged between the outer side wall of the left water inlet 23 of the outer pipe 21 and the inner side wall of the water outlet of the left water delivery pipe 5, and between the outer side wall of the right water inlet 24 of the outer pipe 21 and the inner side wall of the water outlet of the right water delivery pipe 6, respectively.

[0122] If the outer side wall of the water outlet of the left water delivery pipe extends into the inner side wall of the left water inlet of the outer pipe, and the outer side wall of the water outlet of the right water delivery pipe extends into the inner side wall of the right water inlet of the outer pipe, bearings are arranged between the outer side wall of the water outlet of the left water delivery pipe and the inner side wall of the left water inlet of the outer pipe, and between the outer side wall of the water outlet of the right water delivery pipe and the inner side wall of the right water inlet of the outer pipe, respectively.

[0123] Please refer to Figure 1 , Figure 5 and Figure 10 In some embodiments, the water supply and discharge arm support is a fire-fighting arm support, and the water supply and discharge arm support further comprises a fire monitor 3 connected to the water outlet of the inner pipe 22, which extends out of the outer pipe 21. Generally, the end of the inner pipe 22 extending out of the outer pipe 21 serves as the water outlet of the multi-stage telescopic pipe 2, and the water outlet of the inner pipe 22 is located at the end of the inner pipe 22 away from the outer pipe 21, while the water inlet of the inner pipe 22 is always located inside the outer pipe 21. The fire monitor 3 is used to spray high-pressure water flow or other fire extinguishing agents for fire extinguishing operations.

[0124] Since the fire monitor 3 needs to spray high-pressure water column during operation, the water flow generates a huge pressure inside the pipe, especially in the sliding sealing area between the inner pipe 22 and the outer pipe 21, which bears a combined working condition of continuous high pressure and dynamic telescoping. Therefore, the reliability of the sealing assembly 1 is highly required. To this end, the present application adopts an inflatable lip seal ring as the core sealing structure, and the design sealing water pressure is more than 1.2 times of the rated outlet pressure of the fire monitor 3, for example, the sealing water pressure of the inflatable lip seal ring can reach 1.2 times, 1.3 times or 1.4 times of the rated outlet pressure of the fire monitor 3. Preferably, the rated outlet pressure of the fire monitor 3 is 0.8-1.3 MPa (mega pascal, unit of pressure).

[0125] Please refer to Figure 5 and Figure 10In some embodiments, the lifting mechanism 9 comprises lifting telescopic rods, which can be oil cylinders, air cylinders or electric cylinders. One end of the lifting telescopic rods is hingedly connected, such as pin-connected, to the side wall of the outer pipe 21, and the other end is hingedly connected, directly or indirectly, to the lower support cylinder 4. The telescopic action of the lifting telescopic rods pushes the outer pipe 21 to lift or lower around the rotation center to adjust the inclination angle, so that the water outlet is aligned with the preset direction. Generally, there are two lifting telescopic rods, which are arranged on the left and right sides of the outer pipe 21 and synchronously telescoped to improve the stability of the arm movement and the structural stability. In other embodiments, the lifting mechanism 9 can lift the multi-stage telescopic pipe 2 to incline around the rotation point.

[0126] Referring to Figures 1 to 10 The embodiments also provide a fire truck, which comprises a chassis 8, a fire pump 100 and a water supply and discharge arm support. The engine of the chassis 8 provides power for the fire pump 100, and the fire pump 100 is connected to the outer pipe 21 of the water supply and discharge arm support through a pipeline. The water supply and discharge arm support is the water supply and discharge arm support according to any one of the above embodiments.

[0127] Referring to Figure 10 The fire truck further comprises a slewing mechanism 7, which is installed on the chassis 8 and generally comprises a slewing bearing and a slewing driving device, such as a reduction motor or a hydraulic motor. The slewing mechanism can drive the upper arm support and the lower support cylinder to rotate in the horizontal plane to realize multi-directional operation coverage.

[0128] Preferably, the lifting telescopic rods support the outer pipe 21 on the slewing mechanism 7, so that the multi-stage telescopic pipe 2 inclines around the rotation point (the water inlet or water outlet) of the water supply and discharge pipe. The end of the lifting telescopic rod away from the outer pipe 21 is hingedly connected to the lower support cylinder 4 directly, or the end of the lifting telescopic rod away from the outer pipe 21 is hingedly connected to the slewing mechanism 7 for supporting and installing the lower support cylinder 4, instead of being directly connected to the lower support cylinder 4. At this time, the lower support cylinder 4 is fixed to the slewing mechanism 7, and driving the slewing mechanism 7 can drive the multi-stage telescopic pipe 2, the lifting telescopic rod and the lower support cylinder 4 to rotate together.

[0129] Finally, it should be noted that the above embodiments have been described in the specification and drawings of the present application, but this does not limit the patent protection scope of the present application. Any technical solutions obtained by replacing or modifying the equivalent structures or equivalent processes based on the essential concept of the present application, using the contents described in the specification and drawings of the present application, and directly or indirectly implementing the technical solutions of the above embodiments in other related technical fields, are all included in the patent protection scope of the present application.

Claims

1. A water supply and drainage boom, characterized in that, include: Multi-stage expansion joints and sealing components; The multi-stage telescopic tube includes an outer tube and an inner tube, with the inner tube slidably sleeved within the outer tube; The sealing assembly includes a first end cap, a second end cap, and an inflatable lip seal. The first end cap and the second end cap are detachably connected, forming an accommodating space for the inflatable lip seal. The second end cap is disposed on the outer tube. The inflatable lip seal includes a seal ring body with an internal air cavity. An inflation port protrudes outward from the outer circumferential surface or the other end face of the seal ring body, communicating with the air cavity and passing through the first end cap or the second end cap. An inner sealing lip is provided on one end face of the seal ring body, extending into the gap between the second end cap and the inner tube. The inner circumferential surface of the seal ring body has a concave-convex structure for sealing, which contacts the outer circumferential surface of the inner tube.

2. The water supply and drainage boom according to claim 1, characterized in that: The second end cap includes an end cap body and a first guide sleeve. The second end cap is detachably connected to the first end cap through the end cap body. A second positioning groove is provided on the inner circumferential surface of the end cap body. The first guide sleeve is fitted in the second positioning groove. A first positioning groove is provided on the inner circumferential surface of the first guide sleeve. The inner sealing lip of the inflatable lip seal ring extends into the gap between the inner circumferential surface of the first guide sleeve and the inner tube. The multi-stage telescopic pipe also includes a first wear-resistant component, a second guide sleeve, and a second wear-resistant component; The first wear-resistant component is fitted into the first positioning groove and is slidably connected to the inner tube; The second guide sleeve is fitted onto the outer circumferential surface of the inner tube and located inside the outer tube. A third positioning groove is provided on the outer circumferential surface of the second guide sleeve. The second wear-resistant component is disposed in the third positioning groove and is slidably connected to the inner circumferential surface of the outer tube; or... The second guide sleeve is fitted onto the inner circumferential surface of the outer tube and is located inside the outer tube. The inner circumferential surface of the second guide sleeve is provided with a third positioning groove. The second wear-resistant component is disposed in the third positioning groove and is slidably connected to the outer circumferential surface of the inner tube.

3. The water supply and drainage boom according to claim 2, characterized in that: The second end cap further includes a transition ring, which is sandwiched between the end face of the first end cap and the end face of the end cap body. The first guide sleeve extends beyond the end face of the end cap body, and the transition ring is sleeved on the outer periphery of the first guide sleeve. The transition ring and the first guide sleeve together contact the end face where the inner sealing lip of the inflatable lip seal is located. The shape of the transition ring is adapted to the shape of the part of the inflatable lip seal except for the inner sealing lip.

4. The water supply and drainage boom according to claim 3, characterized in that: The sealing ring body has an outer sealing lip on one side end face. The outer sealing lip and the inner sealing lip are located on the same side end face of the sealing ring body. The outer sealing lip is located outside the inner sealing lip. The transition ring has a channel for accommodating the outer sealing lip of the inflatable lip seal ring.

5. The water supply and drainage boom according to claim 3, characterized in that: It also includes a second sealing ring, which is disposed between the transition ring and the end face of the end cap body.

6. The water supply and drainage boom according to claim 1, 2, or 3, characterized in that: The end face of the sealing ring body is provided with a positioning lip; The positioning lip and the inner sealing lip are located on the same end face of the sealing ring body, and the positioning lip is located outside the inner sealing lip; or, The positioning lip and the inner sealing lip are located on opposite end faces of the sealing ring body.

7. The water supply and drainage boom according to claim 1, characterized in that: Before inflation, the inner circumferential surface of the inflatable lip seal is a concave surface that curves inward toward the outer circumferential surface of the seal body; and / or, The concave-convex structure includes three annular convex rings arranged sequentially along the axial direction of the sealing ring body.

8. The water supply and drainage boom according to claim 1, characterized in that: It also includes a lower support cylinder, a left water supply pipe, a right water supply pipe, and a lifting mechanism; The lower support cylinder is located below the outer pipe. The left outlet of the lower support cylinder is connected to the inlet of the left water supply pipe, the outlet of the left water supply pipe is connected to the left inlet of the outer pipe, the right outlet of the lower support cylinder is connected to the inlet of the right water supply pipe, and the outlet of the right water supply pipe is connected to the right inlet of the outer pipe. The left inlet of the outer pipe is rotatable relative to the outlet of the left water supply pipe, and the right inlet of the outer pipe is rotatable relative to the outlet of the right water supply pipe. A third sealing ring is provided between the left inlet of the outer pipe and the outlet of the left water supply pipe, and between the right inlet of the outer pipe and the outlet of the right water supply pipe. Alternatively, the inlet of the left water supply pipe is rotatable relative to the left outlet of the lower support cylinder, and the inlet of the right water supply pipe is rotatable relative to the right outlet of the lower support cylinder. A third sealing ring is provided between the inlet of the left water supply pipe and the left outlet of the lower support cylinder, and between the inlet of the right water supply pipe and the right outlet of the lower support cylinder. One end of the lifting mechanism is connected to the outer tube, and the other end is directly or indirectly connected to the lower support cylinder, for adjusting the pitch of the outer tube.

9. The water supply and drainage boom according to claim 8, characterized in that: The third sealing ring is a Glyd ring.

10. The water supply and drainage boom according to any one of claims 1 to 9, characterized in that: It also includes a fire monitor, which is connected to the outlet of the inner pipe, and the outlet of the inner pipe extends out of the outer pipe.

11. A fire truck, characterized in that, include: Chassis, fire pump, and water supply and drainage boom; The engine of the chassis provides power to the fire pump, and the fire pump is connected to the outer pipe of the water supply and drainage boom through a pipeline. The water supply and drainage boom is the water supply and drainage boom as described in claim 10.

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