Metallic hose connected to a rigid element

Abstract

The present application relates to the technical field of metal hose, especially to a metal hose connected with rigid elements, comprising a metal hose body, one end of the metal hose body is penetrated and abuts with an external lock sleeve, the inner arc surface of the external lock sleeve is sleeved with an internal joint, through the clamping and limiting design of flexible elastic sheets and embedding grooves, cooperating with the sliding fit of the external lock sleeve and the internal joint, the initial assembly does not need complex tools, and the fixed effect can be achieved by pushing, without repeated alignment and adjustment, compared with the traditional threaded connection, the assembly time is shortened, at the same time, through the structural design of adapting to various placement states such as vertical and horizontal, the effect of not being limited by the installation posture and wider adaptability is achieved, and cooperating with the flexible adaptation of the tongue-shaped pressing sheet and the penetrating type locking structure of the L-shaped inserting sheet, the effect of quickly realizing the alignment of the internal joint and the rigid element, without special tools, can achieve stable connection and disassembly, and the connection stability and operation convenience are considered.

Description

Technical Field

[0001] This invention relates to the field of metal hose technology, and more particularly to a metal hose that connects to a rigid element. Background Technology

[0002] In the connection scenarios of metal hoses and rigid components, especially in narrow spaces such as deep inside equipment, dense pipeline gaps, and enclosed cavities, there is often a need for blind assembly operations. That is, operators cannot visually align the connection interface, and the operating space is limited, making it difficult to carry auxiliary tools such as wrenches and screwdrivers. At present, the connection methods of metal hoses and rigid components are still mainly traditional threaded connections, welding connections, and conventional snap-fit ​​connections. These connection methods have many technical defects that are difficult to solve in blind assembly scenarios, which seriously affect assembly efficiency and connection reliability.

[0003] Traditional threaded connections are currently the most widely used connection method. They require operators to repeatedly align the threaded interface and tighten it by rotating. This is not only cumbersome, but also difficult to align accurately in blind assembly scenarios, requiring multiple adjustments and resulting in extremely low assembly efficiency. At the same time, threaded connections require tools such as wrenches to tighten and loosen, making them impossible to operate properly in confined blind assembly scenarios without tools. Even with customized extended tools, assembly costs and operational difficulties are significantly increased. Furthermore, after long-term use, the threads are susceptible to fluid corrosion and rust, which can cause them to become stuck, making disassembly impossible or the connection loose, and subsequent maintenance extremely inconvenient.

[0004] Chinese patent application CN202011127661.2 discloses a metal flexible hose connector structure, including a left connecting pipe and a right connecting pipe. The right connecting pipe is located at the right end of the left connecting pipe. Both the left and right connecting pipes have annular connecting grooves on their outer sides, and clamps are slidably connected to the upper and lower ends of the annular connecting grooves. Locking rods are threaded to the upper and lower ends of the left and right connecting pipes and located outside the annular connecting grooves. Several limiting blocks are fixedly connected to the inner side of each clamp. Several anti-slip grooves, the same number as the limiting blocks, are opened inside the annular connecting grooves and on the inner side of each clamp. Because the annular connecting grooves are inclined, it is easy to insert hoses of various diameters into the annular connecting grooves, ensuring the applicability range. The limiting blocks squeeze the elastic band and hose, and the hose and elastic band are pressed into the anti-slip grooves, making it difficult for the hose to separate from the left or right connecting pipe, thus ensuring the stability after installation.

[0005] However, the metal hose connector structure disclosed in this patent still has technical defects that make it unsuitable for blind installation scenarios. It cannot solve the blind installation needs in small, enclosed spaces without tools or visual inspection. The locking and fixing of this structure relies on the locking rod of the threaded connection. The operator needs to use tools to rotate the locking rod to drive the clamp to squeeze and fix the hose. It still does not get rid of the dependence on tools and cannot be operated normally in small, tool-free blind installation scenarios. It has the same tool dependence problem as traditional threaded connections. Secondly, the sealing depends on the fit between the hose and the annular connecting groove. There is no dedicated self-sealing structure. If the blind installation is not done properly, fluid leakage is likely to occur. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and to propose a flexible metal hose that connects to a rigid element.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: The device includes a flexible metal hose body, one end of which is connected to an external locking sleeve. An internal connector is fitted onto the inner arc surface of the external locking sleeve. A spring connects the internal connector and the external locking sleeve. A receiving arc element is provided at the edge of the inner arc surface of the internal connector. A water-carrying cavity is provided between the receiving arc element and the inner wall of the internal connector. An arc-shaped conical section is provided near the flexible metal hose body near the receiving arc element and the water-carrying cavity. The arc-shaped conical section and the water-carrying cavity are an integral structure. An extended protrusion is provided at one edge of the inner arc surface of the external locking sleeve. A stepped section is provided on the side of the inner arc surface of the external locking sleeve near the extended protrusion. A ratchet is provided on the outer arc surface of the stepped section.

[0008] Preferably, a ferromagnetic ring is engaged on the inner arc surface of the external locking sleeve away from the stepped section, and a flexible spring is provided on the outer arc surface of the internal connector near the arc cone section, with a ball bearing sleeved between the flexible spring and the outer arc surface of the internal connector.

[0009] Preferably, the surface of the built-in connector that contacts the ball has a flexible surface, and one end of the flexible spring is curved upwards and inserted into the ratchet groove.

[0010] Preferably, the lower surface of the extended protrusion abuts against the outer arc surface of the metal hose, the lower surface of the extended protrusion corresponds to the flexible spring, one end of the spring is connected to the stepped section, a connecting section is provided in the middle of the outer arc surface of the built-in connector, and the other end of the spring is connected to the connecting section.

[0011] Preferably, one side of the bottom surface of the connecting section is curved, and the outer arc surface of the receiving arc member is provided with a deformation section in the middle, and the deformation sections correspond to the water flow cavity.

[0012] Preferably, the end of the receiving arc member away from the arc cone segment is provided with an elastic arc surface, which is an arc-shaped folded edge structure and contacts the curved top.

[0013] Preferably, the curved outer arc surface is fitted with a half-shaped iron block, the half-shaped iron block is attracted and adapted to the ferromagnetic ring on the inner arc surface of the outer lock sleeve, and the outer arc surface of the built-in connector has a groove at its tail end.

[0014] Preferably, the outer arc surface of the built-in connector is fitted with a positioning ring platform, the bottom of the outer arc surface of the positioning ring platform is provided with a through groove, and an L-shaped insert is connected through the through groove on the surface of the positioning ring platform.

[0015] Preferably, tongue-shaped pressure plates are symmetrically provided on both sides of the inner arc surface of the positioning ring platform, and there is a gap between the outer wall of the tongue-shaped pressure plate and the L-shaped insert. The L-shaped insert and the receiving arc member are in the same plane, and the middle part of one side surface of the L-shaped insert is a through structure.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. Through the snap-fit ​​and limiting design of the flexible spring and the groove, combined with the sliding fit of the external locking sleeve and the internal connector, the initial assembly can be completed without complicated tools. It can be fixed by pushing, without repeated alignment and adjustment. Compared with the traditional threaded connection, the assembly time is shortened. At the same time, through the structural design that adapts to various placement states such as vertical and horizontal, it achieves the effect of not being restricted by the installation posture and having a wider range of adaptability. With the flexible adaptation of the tongue-shaped pressure plate and the through-type locking structure of the L-shaped insert, the internal connector and rigid component can be quickly aligned. The connection and disassembly can be completed without special tools, which balances the connection stability and the ease of operation. In addition, through the flexible deformation design of the tongue-shaped pressure plate, it can adapt to the small size deviation of the rigid component connection end, improve the connection versatility, and adapt to the connection requirements of rigid components of different specifications.

[0017] 2. Limiting is achieved through the engagement of the flexible spring and the grooved ratchet, and continuous pre-tightening force is provided by the energy storage of the spring compression. After water is introduced, the connection strength is enhanced by the magnetic adsorption of the semi-shaped iron block and the ferromagnetic ring. The three work together to effectively resist the risk of loosening caused by water flow impact, equipment vibration and long-term use, solving the pain points of loosening and failure of existing connection structures and ensuring the long-term stability of the connection. The fit design of the ferromagnetic ring and the outer arc surface of the built-in connector restricts the circumferential rotation of the built-in connector in the external locking sleeve, avoiding the locking loosening and sealing failure caused by circumferential rotation. The design of the ball sleeve between the flexible spring and the built-in connector reduces the friction between the two, ensuring the smooth deformation of the flexible spring and avoiding long-term fatigue failure of the flexible spring, further improving the reliability and service life of the connection.

[0018] 3. The external locking sleeve's extended protrusion tightly abuts against the outer wall of the metal hose, achieving a preliminary sealing and blocking of the connection gap. After water is introduced, the arc-shaped conical section expands under water pressure and tightly adheres to the inner arc surface of the metal hose, forming the first seal, filling the tiny depressions in the inner arc surface of the metal hose, and improving the sealing fit. The expansion of the flexible surface upon contact with water pushes the ball bearings, which in turn causes the flexible spring to deform, indirectly strengthening the fit between the extended protrusion and the metal hose body, forming the second seal. The multi-layered sealing works synergistically to effectively prevent water leakage from the connection gap.

[0019] 4. The buffer design of the water flow chamber buffers the water flow pressure and prevents excessive water flow pressure from causing seal failure. At the same time, the water flow circulation design of the water flow chamber reduces water stagnation and the risk of scaling, preventing scale from causing sealing gaps and further ensuring the long-term stability of sealing performance. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall connection structure of a metal flexible tube connected to a rigid element according to the present invention; Figure 2 This is a schematic diagram of an integral connector structure for a metal flexible hose connected to a rigid element, as proposed in this invention. Figure 3 This is a first-section side view of the built-in connector of a metal flexible hose connected to a rigid element according to the present invention. Figure 4 This is a partial view of a receiving arc member for a metal flexible tube connected to a rigid element according to the present invention; Figure 5 This is a cross-sectional view of the external locking sleeve and the connection between the external locking sleeve and a metal flexible tube connected to a rigid element, as proposed in this invention. Figure 6 This is a second sectional view of the built-in connector of a metal flexible hose connected to a rigid element according to the present invention. Figure 7 For the present invention Figure 5 Enlarged structural diagram at point A; Figure 8 This is a structural diagram of a positioning ring platform for a metal flexible tube connected to a rigid element, as proposed in this invention.

[0021] In the diagram: 1. Flexible metal hose body; 2. External locking sleeve; 21. Extended protrusion; 22. Stepped section; 221. Ratchet; 23. Ferromagnetic ring; 3. Built-in connector; 31. Accommodating arc component; 311. Circular arc conical section; 312. Deformation section; 313. Elastic arc surface; 32. Water flow cavity; 33. Flexible surface; 34. Curved arc shape; 35. Groove; 36. Flexible spring; 37. Connecting section; 4. Spring; 5. Ball bearing; 6. Half-shaped iron block; 7. Positioning ring platform; 71. Tongue-shaped pressure plate; 8. L-shaped insert. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0023] The terms used in this invention, such as "upper," "lower," "left," "right," "middle," and "one," are merely for clarity of description and are not intended to limit the scope of the invention. Any changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

[0024] Reference Figures 1-8 A flexible metal hose connected to a rigid element includes a flexible metal hose body 1. One end of the flexible metal hose body 1 is connected to an external locking sleeve 2. An internal connector 3 is sleeved on the inner arc surface of the external locking sleeve 2. A spring 4 is connected between the internal connector 3 and the external locking sleeve 2. An accommodating arc member 31 is provided at the edge of the inner arc surface of the internal connector 3. A water-carrying cavity 32 is provided between the accommodating arc member 31 and the inner wall of the internal connector 3. An arc-shaped conical section 311 is provided near the flexible metal hose body 1 near the accommodating arc member 31 and the water-carrying cavity 32. The arc-shaped conical section 311 and the water-carrying cavity 32 are an integrated structure. An extended protrusion 21 is provided at one edge of the inner arc surface of the external locking sleeve 2. A stepped section 22 is provided on the side of the inner arc surface of the external locking sleeve 2 near the extended protrusion 21. A ratchet 221 is provided on the outer arc surface of the stepped section 22.

[0025] In the embodiment of the above technical solution, the metal flexible tube 1 is first inserted between the external locking sleeve 2 and the internal connector 3, so that one end of the metal flexible tube 1 gradually extends into the cavity formed by the two until it contacts the stepped section 22 inside the external locking sleeve 2. Regardless of whether the metal flexible tube 1 is placed vertically or horizontally, the operator only needs to slowly push the external locking sleeve 2 in the direction of the metal flexible tube 1. The external locking sleeve 2 will move relative to the internal connector 3, thereby compressing the spring 4 connected between the stepped section 22 and the connecting section 37 of the internal connector 3, so that the spring 4 is in a compressed and stored energy state. The compressed and stored energy of the spring 4 can form a continuous preload force to prevent the external locking sleeve 2 and the internal connector 3 from loosening after initial assembly.

[0026] As the pushing action continues, the receiving arc member 31 at the edge of the inner arc surface of the built-in connector 3, and the arc-shaped conical segment 311 near the end of the metal hose body 1, will gradually conform to the inner arc surface of the metal hose body 1. Utilizing the arc-shaped structure of the arc-shaped conical segment 311, the initial positioning of the metal hose body 1 and the built-in connector 3 is achieved, preventing misalignment during assembly. Simultaneously, the arc-shaped fit of the arc-shaped conical segment 311 reduces stress concentration at the port of the metal hose body 1, preventing stress on the port of the metal hose body 1 during assembly. The pushing distance can be determined by the flexible spring piece 36 on the outer arc surface of the built-in connector 3. During the backward compression of the spring 4, the stepped segment 22 will first contact the upward-curved end of the flexible spring piece 36. Since the curved edge of the flexible spring piece 36 is higher than the surface of the stepped segment 22... The stepped section 22 exerts downward pressure on the flexible spring 36, causing the flexible spring 36 to temporarily deform. When the stepped section 22 moves to the groove 35 at the end of the outer arc surface of the corresponding built-in connector 3, the flexible spring 36 resets under its own elasticity, and its raised end quickly inserts into the groove 35, making a "click" sound. At this time, the flexible spring 36 and the groove 35 form a snap-fit ​​limit, restricting the outer locking sleeve 2 from continuing to move. The operator can stop pushing and release, completing the initial installation and fixation of the metal hose body 1, the outer locking sleeve 2, and the built-in connector 3. This snap-fit ​​limit structure can achieve rapid positioning and locking of the initial assembly without the need for any tools, improving assembly efficiency while avoiding potential connection problems caused by incomplete initial assembly.

[0027] At the same time, the extended protrusion 21 at one edge of the inner arc surface of the external locking sleeve 2 will tightly abut against the outer arc surface of the metal hose body 1. The extended protrusion 21 is made of flexible material, which can not only form a flexible clamping on the metal hose body 1 to avoid hard contact causing wear on the outer wall of the metal hose body 1, but also initially seal the gap between the metal hose body 1 and the external locking sleeve 2, playing a preliminary sealing role. The flexible clamping of the extended protrusion 21 can also adapt to the small dimensional deviations of the outer wall of the metal hose body 1, ensuring the fit during initial assembly and avoiding poor initial sealing due to dimensional deviations.

[0028] The preferred technical solution in this embodiment is: Reference Figure 2 and Figure 8 The outer arc surface of the built-in connector 3 is fitted with a positioning ring platform 7. A through groove is opened at the bottom of the outer arc surface of the positioning ring platform 7. An L-shaped insert 8 is connected through the through groove on the surface of the positioning ring platform 7. Tongue-shaped pressure plates 71 are symmetrically arranged on both sides of the inner arc surface of the positioning ring platform 7. There is a gap between the outer wall of the tongue-shaped pressure plate 71 and the L-shaped insert 8. The L-shaped insert 8 and the receiving arc part 31 are in the same plane. The middle part of one side surface of the L-shaped insert 8 is a through structure.

[0029] The connection between the built-in connector 3 and the rigid component is achieved through the synergistic action of the positioning ring 7 and the L-shaped insert 8, ensuring a stable connection and facilitating assembly and disassembly. Specifically, the positioning ring 7 is fixedly sleeved on the outer arc surface of the built-in connector 3. Its function is to provide a positioning reference for the connection between the built-in connector 3 and the rigid component, preventing misalignment during connection. The outer diameter of the positioning ring 7 matches the inner diameter of the connection port of the rigid component, enabling quick alignment of the built-in connector 3 and the rigid component, thus improving connection efficiency. A through groove is provided at the bottom of the outer arc surface of the positioning ring 7, and the L-shaped insert 8 is connected through this through groove. The L-shaped insert 8 and the receiving arc component 31 are in the same plane, ensuring uniform force during connection and preventing the built-in connector 3 from tilting during connection, thus ensuring coaxiality of the connection.

[0030] During assembly, align the connecting end of the rigid element with the positioning ring platform 7, so that the connecting port of the rigid element is fitted onto the outside of the positioning ring platform 7. At this time, the tongue-shaped pressure plates 71 symmetrically arranged on both sides of the inner arc surface of the positioning ring platform 7 will shrink inward under the fitting pressure of the rigid element and fit tightly against the outer arc surface of the built-in connector 3, forming a preliminary clamping and positioning. The tongue-shaped pressure plates 71 are made of flexible elastic material, and their shrinkage deformation can adapt to the small dimensional deviation of the connecting port of the rigid element. At the same time, their tight fit can further improve the connection stability between the positioning ring platform 7 and the built-in connector 3, and prevent the positioning ring platform 7 from loosening. Then, push the L-shaped insert 8 so that it passes through the through groove of the positioning ring platform 7 and is inserted into the pre-set connecting hole of the rigid element. Since the middle of one side surface of the L-shaped insert 8 is a through structure, after insertion, simple parts such as bolts can be used to pass through the through structure to lock and fix the L-shaped insert 8 and the rigid element, thereby firmly connecting the built-in connector 3 and the rigid element. The bolt locking can further improve the connection strength and prevent the connection from loosening due to long-term use or vibration.

[0031] A gap is provided between the outer wall of the tongue-shaped pressure plate 71 and the L-shaped insert 8. This gap can reserve a certain deformation space to avoid interference between the L-shaped insert 8 and the tongue-shaped pressure plate 71 when the L-shaped insert 8 is inserted, ensuring smooth insertion of the L-shaped insert 8. At the same time, the flexible deformation of the tongue-shaped pressure plate 71 can adapt to the small dimensional deviations of the rigid component connection end, improving the versatility of the connection. When disassembling, simply remove and pull out the L-shaped insert 8. The tongue-shaped pressure plate 71 will reset under its own elasticity, which can quickly separate the built-in connector 3 from the rigid component without complicated tools. This balances connection stability and ease of operation, while avoiding the problem of loose connection caused by dimensional deviation in rigid connection. It also avoids the defects of traditional rigid connection disassembly being cumbersome and easy to damage components. Reference Figure 3 and Figure 4A ferromagnetic ring 23 is engaged on the inner arc surface of the external locking sleeve 2 away from the stepped section 22. A flexible spring piece 36 is provided on the outer arc surface of the internal connector 3 near the arc cone section 311. A ball 5 is sleeved between the flexible spring piece 36 and the outer arc surface of the internal connector 3. The surface of the internal connector 3 that contacts the ball 5 is provided with a flexible surface 33. One end of the flexible spring piece 36 is upturned and inserted into the ratchet groove 221. The lower surface of the extended protrusion 21 abuts against the outer arc surface of the metal hose body 1. The lower surface of the extended protrusion 21 corresponds to the flexible spring piece 36. One end of the spring 4 is connected to the stepped section 22. A connecting section 37 is provided in the middle of the outer arc surface of the internal connector 3. The other end of the spring 4 is connected to the connecting section 37.

[0032] When water flows from the rigid element into the built-in connector 3, it first contacts the elastic arc surface 313 at the end of the receiving arc member 31 away from the arc cone section 311. The elastic arc surface 313 has an arc-shaped folded edge structure, which can buffer and divert the water flow, preventing the water flow from directly impacting the port of the metal hose body 1, reducing the damage of the water flow impact to the connection part, and extending the service life of the metal hose body 1. The diverted water flow is divided into two parts: one part flows directly into the inner cavity of the metal hose body 1 through the through hole in the middle of the built-in connector 3 to achieve normal fluid transportation, and the other part flows into the water passage cavity 32 between the receiving arc member 31 and the inner wall of the built-in connector 3, providing power for the subsequent linkage reaction. At the same time, the water passage cavity 32 can buffer the water flow pressure and prevent the seal failure caused by excessive water flow pressure.

[0033] As water continues to flow into the water-carrying cavity 32, the water-carrying cavity 32 will gradually be filled with water. At this time, the flexible surface 33 on the built-in connector 3 that contacts the ball 5 will expand due to water. The flexible surface 33 is made of water-swellable material. After expansion, the flexible surface 33 will press the upper ball 5 upward. After being compressed, the ball 5 will push the flexible spring 36 upward, causing the originally linear flexible spring 36 to deform into an arched structure. The amount of water expansion of the flexible surface 33 can be adjusted according to the water pressure to ensure stable compression of the ball 5, thereby ensuring stable deformation of the flexible spring 36. (The flexible surface 33 is set on the outer surface of the built-in connector 3 and is made of water-swellable rubber material. After being exposed to water, it expands in volume. The expanded flexible surface 33 will press the ball 5 above it outward. The ball 5 will then push the flexible spring 36 upward, causing the originally linear flexible spring 36 to arch upward and form an arched structure.)

[0034] The sealing boundary of the water-carrying cavity 32 is defined by the following structures: The interference fit between the inlet side elastic arc section 313 and the inner wall of the built-in connector 3 allows the diverted water flow to enter the water flow chamber 32 in one direction only, preventing backflow. The fit between the outlet side arc conical section 311 and the inner arc surface of the metal hose body 1, as well as the integral molding structure of the housing arc section 31 and the inner wall of the built-in connector 3, form a closed chamber, so that the water flow can only build up pressure inside and cannot leak out.

[0035] The pressure inside the water flow chamber 32 increases with the increase of water volume, forming a closed buffer chamber that is balanced with the external water pressure.

[0036] The arched flexible spring 36 further tightens itself within the ratchet 221 of the stepped section 22. After the arch deforms, the contact area between the spring and the ratchet 221 increases, and the contact pressure is enhanced, strengthening the locking effect between the external locking sleeve 2 and the internal connector 3. This prevents relative movement caused by water flow impact and equipment vibration, avoiding loose connections. The toothed structure of the ratchet 221 can engage with the arched flexible spring 36, further preventing relative slippage and improving the reliability of locking. On the other hand, the arched flexible spring 36 protrudes into the interior of the metal hose body 1, forming a double-layer clamping layer with the outer protruding end 21 of the external locking sleeve 2. This achieves bidirectional flexible clamping of the metal hose body 1, preventing displacement of the metal hose body 1 and buffering the stress caused by water flow impact and equipment vibration, reducing fatigue damage to the metal hose body 1 and extending its service life.

[0037] Meanwhile, after the water flow cavity 32 is filled with water, the water flow will exert outward pressure on the arc-shaped conical section 311, causing the arc-shaped conical section 311 to expand slightly. The arc-shaped conical section 311 is made of flexible material and can deform with pressure. After expansion, the arc-shaped conical section 311 will fit tightly with the inner arc surface of the metal hose body 1. This not only forms the first seal for the water flow inside the metal hose body 1, preventing water from leaking from the gap between the metal hose body 1 and the built-in connector 3, but also fills the tiny depressions on the inner arc surface of the metal hose body 1, further improving the sealing and stability of the connection, avoiding fluid leakage caused by poor sealing, and reducing the wear of the metal hose body 1 port caused by water flow impact, thus extending the service life of the metal hose body 1. In addition, the expansion deformation of the arc-shaped conical section 311 can adapt to the dimensional deviation of the inner arc surface of the metal hose body 1, ensuring that the sealing effect of metal hose bodies 1 of different specifications is consistent after assembly, and improving the versatility of the product.

[0038] Reference Figure 5 and Figure 6One side of the bottom surface of the connecting section 37 is provided with a curved arc 34. The middle of the outer arc surface of the receiving arc member 31 is provided with a deformation section 312. The deformation sections 312 correspond to the water flow cavity 32. The end of the receiving arc member 31 away from the arc cone section 311 is provided with an elastic arc surface 313. The elastic arc surface 313 is an arc-shaped folded edge structure and contacts the curved arc 34 at the top. The outer arc surface of the curved arc 34 is fitted with a half-shaped iron block 6. The half-shaped iron block 6 is attracted and matched with the ferromagnetic ring 23 on the inner arc surface of the external locking sleeve 2. The tail end of the outer arc surface of the built-in connector 3 is provided with a groove 35.

[0039] As the water flow cavity 32 is filled with water, some of the water flow in the water flow cavity 32 will flow back to the other side of the elastic arc-shaped surface 313 that is impacted by the water flow, generating a reverse impact force on the elastic arc-shaped surface 313. This causes the elastic arc-shaped surface 313 to undergo secondary deformation, with the end away from the receiving arc component 31 flipping upwards and pressing against the bottom side of the curved arc-shaped 34 connecting section 37 at the top. The secondary deformation of the elastic arc-shaped surface 313 can be adjusted according to the water flow pressure to ensure stable pressure against the curved arc-shaped 34, avoiding excessive pressure that could damage the component or insufficient pressure that could not trigger the subsequent magnetic adsorption linkage.

[0040] When the curved 34 is subjected to the pressure of the elastic curved surface 313, it will drive the half-shaped iron block 6 sleeved on its outer curved surface to move upward. When the half-shaped iron block 6 moves to the position corresponding to the ferromagnetic ring 23 on the inner wall of the outer locking sleeve 2, the two will generate a strong magnetic adsorption effect, realizing the tight adsorption and fixation of the half-shaped iron block 6 and the ferromagnetic ring 23. The adsorption surfaces of the half-shaped iron block 6 and the ferromagnetic ring 23 are polished to improve the tightness of adsorption and avoid positioning deviation caused by gaps after adsorption. This magnetic adsorption effect can produce two core effects. The connection stability between the external locking sleeve 2 and the internal connector 3 is further enhanced, forming a locking structure with flexible spring clip 36, spring 4 pre-tightening and magnetic adsorption. This avoids loosening of the connection due to water flow impact, equipment vibration and long-term use, and solves the pain points of easy loosening and failure of the existing connection structure. Among them, the flexible spring clip 36 achieves the limit, the spring 4 pre-tightening provides continuous pre-tightening force, and the magnetic adsorption strengthens the connection strength. They complement each other to ensure the long-term stability of the connection.

[0041] After the semi-shaped iron block 6 is attracted to the ferromagnetic ring 23, it will exert an upward pulling force on the built-in connector 3, making the fit between the built-in connector 3 and the external locking sleeve 2 tighter. At the same time, it will cause the deformation section 312 of the receiving arc part 31 to slightly contract. The deformation section 312 is located in the middle of the outer arc surface of the receiving arc part 31, corresponding to the water flow cavity 32. The contraction of the deformation section 312 will further squeeze the water flow in the water flow cavity 32, increasing the pressure of the water flow on the arc cone section 311, further improving the sealing effect, while reducing the water flow retention in the water flow cavity 32 and reducing the risk of scaling. The amount of contraction of the deformation section 312 can be automatically adjusted according to the magnetic attraction pulling force to avoid excessive contraction that could cause blockage of the water flow cavity 32, ensuring smooth water circulation.

[0042] When the water pressure in the water passage cavity 32 increases, the water pressure acts on the back of the elastic arc surface 313, causing it to deform upwards and press against the upper curved structure 34. The curved structure 34 moves upwards accordingly, causing the semi-shaped iron block 6 sleeved on its outside to move upwards synchronously. When the semi-shaped iron block 6 moves upwards and aligns with the position of the ferromagnetic ring 23 on the inner wall of the outer locking sleeve 2, the two generate a magnetic attraction force, achieving adsorption and fixation. This adsorption action further tightens the internal connector 3 and the outer locking sleeve 2, making the connection more stable. At the same time, it causes the deformation section 312 on the receiving arc part 31 to slightly contract, increasing the pressure in the water passage cavity 32 and further strengthening the sealing effect of the arc cone section 311.

[0043] Reference Figure 7 , The ferromagnetic ring 23 is engaged with the inner arc surface of the outer locking sleeve 2 away from the stepped section 22. In addition to forming magnetic adsorption with the semi-shaped iron block 6, it can also play an auxiliary positioning role for the inner connector 3. The inner arc surface of the ferromagnetic ring 23 is precisely fitted with the outer arc surface of the inner connector 3, which can restrict the circumferential rotation of the inner connector 3 in the outer locking sleeve 2, further improving the stability of the connection and avoiding sealing failure and locking loosening caused by circumferential rotation. At the same time, the ferromagnetic ring 23 is made of high-strength ferromagnetic material, which can withstand long-term magnetic adsorption and avoid deformation or damage, ensuring the long-term stability of the auxiliary positioning and magnetic adsorption effect.

[0044] The ball bearing 5 is sleeved between the flexible spring 36 and the outer arc surface of the built-in connector 3. In addition to transmitting the expansion and compression force of the flexible surface 33, it can also reduce the friction between the flexible spring 36 and the built-in connector 3, avoid fatigue failure caused by long-term deformation and friction of the flexible spring 36, extend the service life of the flexible spring 36, and ensure the smoothness of the deformation of the flexible spring 36, ensuring the stability of the locking effect. The ball bearing 5 is made of wear-resistant stainless steel and the surface is smoothed to further reduce the coefficient of friction. At the same time, it can prevent jamming caused by water corrosion and ensure its long-term smooth operation.

[0045] The deformation section 312 is a flexible transition section that accommodates the arc member 31. In addition to contracting in conjunction with the adsorption action of the semi-shaped iron block 6, it can also buffer the stress caused by the water flow impact, preventing the arc member 31 from breaking due to long-term water flow impact. At the same time, it can adapt to the slight displacement of the metal hose body 1, further improving the adaptability of the connection. The deformation section 312 is made of flexible elastic material, and its deformation range can be automatically adjusted according to the water flow pressure and displacement, which not only ensures the buffering effect, but also avoids structural damage caused by excessive deformation, and extends the service life of the arc member 31.

[0046] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A flexible metal hose for connection to a rigid element, comprising: The metal flexible hose body (1) is characterized in that an external locking sleeve (2) is connected to one end of the metal flexible hose body (1), an internal connector (3) is sleeved on the inner arc surface of the external locking sleeve (2), and a spring (4) is connected between the internal connector (3) and the external locking sleeve (2). The inner arc surface edge of the built-in connector (3) is provided with a receiving arc member (31), and a water flow cavity (32) is provided between the receiving arc member (31) and the inner wall of the built-in connector (3). The receiving arc member (31) and the water flow cavity (32) are provided with a circular arc cone section (311) near the metal hose body (1). The circular arc cone section (311) and the water flow cavity (32) are an integrated structure. The outer locking sleeve (2) has an extended protrusion (21) at one edge of the inner arc surface, and a stepped section (22) is provided on the side of the inner arc surface of the outer locking sleeve (2) near the extended protrusion (21). The outer arc surface of the stepped section (22) has a ratchet (221).

2. The flexible metal hose for connection with a rigid element according to claim 1, characterized in that, A ferromagnetic ring (23) is engaged on the inner arc surface of the external locking sleeve (2) away from the stepped section (22). A flexible spring piece (36) is provided on the outer arc surface of the internal connector (3) near the arc cone section (311). A ball bearing (5) is sleeved between the flexible spring piece (36) and the outer arc surface of the internal connector (3).

3. A flexible metal hose for connection with a rigid element according to claim 2, characterized in that, The surface of the built-in connector (3) that contacts the ball (5) is provided with a flexible surface (33). One end of the flexible spring (36) is raised upwards and inserted into the ratchet groove (221).

4. A flexible metal hose for connection with a rigid element according to claim 2, characterized in that, The lower surface of the extended protrusion (21) abuts against the outer arc surface of the metal hose body (1). The lower surface of the extended protrusion (21) corresponds to the flexible spring (36). One end of the spring (4) is connected to the stepped section (22). The middle part of the outer arc surface of the built-in connector (3) is provided with a connecting section (37). The other end of the spring (4) is connected to the connecting section (37).

5. A flexible metal hose for connection with a rigid element according to claim 4, characterized in that, The bottom surface of one side of the connecting section (37) is provided with a curved shape (34), and the middle part of the outer arc surface of the receiving arc member (31) is provided with a deformation section (312), and the deformation sections (312) correspond to the water flow cavity (32).

6. A flexible metal hose for connection with a rigid element according to claim 5, characterized in that, The end of the receiving arc member (31) away from the arc cone section (311) is provided with an elastic arc surface (313), the elastic arc surface (313) is an arc-shaped folded edge structure, and it contacts the top curved arc (34).

7. A flexible metal hose for connection with a rigid element according to claim 6, characterized in that, The outer arc surface of the curved (34) is fitted with a half-shaped iron block (6), and the half-shaped iron block (6) is attracted and matched with the ferromagnetic ring (23) on the inner arc surface of the external lock sleeve (2). The outer arc surface of the built-in connector (3) is provided with a groove (35).

8. A flexible metal hose for connection with a rigid element according to claim 1, characterized in that, The outer arc surface of the built-in connector (3) is fitted with a positioning ring platform (7), and a through groove is provided at the bottom of the outer arc surface of the positioning ring platform (7). An L-shaped insert (8) is connected through the through groove on the surface of the positioning ring platform (7).

9. A flexible metal hose for connection with a rigid element according to claim 8, characterized in that, The positioning ring platform (7) has tongue-shaped pressure plates (71) symmetrically arranged on both sides of the inner arc surface. There is a gap between the outer wall of the tongue-shaped pressure plate (71) and the L-shaped insert (8). The L-shaped insert (8) and the receiving arc member (31) are in the same plane. The middle part of one side surface of the L-shaped insert (8) is a through structure.

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