A concealed pull head and a concealed pull faucet

Abstract

This invention relates to a concealed pull-out head and a concealed pull-out faucet. The pull-out head includes a T-shaped outer shell, an internal water channel, a valve core assembly, and a button assembly. The internal water channel includes a water inlet chamber, a switching chamber, and a first water outlet chamber that pass through it sequentially. The switching chamber has a switching guide hole. The internal water channel is installed inside the T-shaped outer shell and surrounds it to form a second water passage and a second water outlet chamber. The button assembly pushes the valve shaft to switch the water flow between the first water passage and the second water passage, wherein the second water passage can remain open under water pressure. The pull-out head participates in forming the water passage through the outer shell, reducing the number of independent internal water passage modules, thereby achieving structural miniaturization while ensuring that the water passage area meets the usage requirements. The pull-out head can retract and be hidden inside the front end of the faucet pipe, eliminating the need to thicken the front end of the faucet pipe, thus improving the product's aesthetics and expanding its application range.

Description

Technical Field

[0001] This invention relates to the field of bathroom water outlet technology, and in particular to a concealed pull-out head and a concealed pull-out faucet. Background Technology

[0002] Pull-out faucets are widely used in kitchens and bathrooms. They feature a retractable pull-out head that extends relative to the faucet hose, allowing the water outlet to be pulled out, thus expanding the rinsing range and increasing usability. In some products, to enhance the overall simplicity and seamless design, the pull-out head is designed to retract completely and be hidden inside the front of the faucet hose when not in use, only being pulled out when needed; this type of structure is commonly referred to as a concealed pull-out faucet.

[0003] However, as users demand a higher level of user experience, pull-out taps often need to offer more than just a single water output function; they also need to provide multiple water output modes, such as aerated water mode and shower spray mode. To achieve multi-mode water output, existing technologies typically incorporate a relatively independent water path module or switching module inside the pull-out tap. This module enables water path switching and distribution, while the outer shell of the pull-out tap primarily serves to enclose these modules and provide structural support.

[0004] While the above structure can achieve multiple water output functions, it has the following shortcomings: Because a complete independent water circuit module and valve core switching structure need to be installed inside the pull-out faucet's casing, the stacked arrangement of these components results in a large overall size, especially the front end, which is difficult to compress. This is particularly true in concealed pull-out faucets, where the pull-out head needs to retract into the front of the faucet pipe. Since the internal water flow area of ​​a concealed pull-out faucet must meet basic water output requirements, it cannot be arbitrarily reduced; otherwise, insufficient water flow and a poor user experience will result. To ensure the water flow area and multi-mode water output functionality, a large independent water circuit module must be installed inside the pull-out head. This typically requires designing a relatively large front end of the faucet pipe to accommodate the pull-out head, making the faucet appear bulky, reducing space utilization, and affecting overall aesthetics.

[0005] The design using independent water circuit modules requires the combination of many parts, which not only increases the assembly complexity but also hinders further miniaturization design.

[0006] Therefore, how to reduce the overall size of the pull-out head while ensuring that it has multiple water outlet functions and sufficient water flow capacity, so that it can be adapted to the front end of a smaller faucet pipe and improve the utilization rate of structural space, has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0007] The primary objective of this invention is to provide a concealed pull-out head and a concealed pull-out faucet that are smaller in size and do not require thickening of the faucet pipe.

[0008] The second objective of this invention is to provide a structural solution that utilizes the pull-out head housing to form a water channel. By constructing the space between the outer wall of the internal water channel and the inner wall of the housing guide cavity as a water passage, the setting of independent water channel modules is reduced, the number of parts is reduced, and the utilization rate of structural space is improved.

[0009] A third objective of this invention is to provide a water circuit switching solution that is simple in structure and reliable in switching. By pushing the valve shaft to move through the button assembly and combining the continuous action of the water flow on the valve shaft, stable switching and maintenance between different water output modes can be achieved, thereby realizing functional integration without adding a complex mechanical locking structure.

[0010] To achieve the above objectives, the present invention designs a concealed pull-out head, comprising: A T-shaped housing, wherein the T-shaped housing is provided with a guide cavity and a branch cavity communicating with the guide cavity; An internal water channel includes an inlet chamber, a switching chamber, and a first outlet chamber that are connected in sequence. The switching chamber forms a valve core chamber. The side wall of the valve core chamber is provided with a switching guide hole. The outer wall of the inlet chamber is provided with a threaded structure for connecting with the outlet pipe of a pull-out faucet. A valve core assembly, the valve core assembly including a valve body, a valve shaft and a first elastic element, the valve shaft being movably engaged with the valve body and forming a first water passage under the action of the first elastic element; The valve core assembly is installed in the valve core cavity. When the first elastic element is in a stretched or basically stretched state, the valve shaft closes the switching guide hole. The first water passage connects the water inlet cavity and the first water outlet cavity to form a first water path. The internal water channel is installed in the guide cavity and forms a second water passage and a second water outlet cavity with the inner wall of the guide cavity. The switching guide hole is correspondingly provided with the branch cavity. The branch cavity is provided with a movable button assembly, which is used to push the valve shaft to open the switching guide hole and compress the first elastic element to close the first water passage, so that the water flows through the switching guide hole into the second water passage and is output from the second water outlet cavity to form a second water path; and the water flow in the second water passage applies pressure to the valve shaft to keep it open to maintain the switching guide hole.

[0011] Furthermore, the button assembly includes a button body, a second elastic element, and a limiting structure. The button body includes a front thin rod section, a middle sealing ring mounting section, and a rear thick rod section. The middle sealing ring mounting section is provided with a sealing ring. The second elastic element is sleeved on the outer periphery of the thin rod section and limited by the limiting structure. The thin rod section passes through the limiting structure. When the thick rod section is subjected to force and moves inward, it drives the thin rod section to push the valve shaft away from the switching guide hole and compress the second elastic element. After the external force is released, the second elastic element rebounds and drives the button body to move outward. During the entire process of the button body moving inward and outward, the sealing ring is always located in the branch cavity and remains sealed, and the thick rod section is always at least partially exposed in the branch cavity to form an operating part for the user to press.

[0012] Furthermore, the outer wall of the internal waterway is provided with an embedding groove and an axially extending groove next to the switching guide hole. The limiting structure is a retaining spring. The front end of the retaining spring is provided with an expansion portion, and the front end of the thin rod segment is provided with a flange. The lateral dimension of the flange is larger than the opening size of the expansion portion. The expansion portion is sleeved on the outer periphery of the thin rod segment, and the retaining spring is installed in the embedding groove and the groove so that the flange is limited by the retaining spring during the inward and outward movement of the button body.

[0013] Furthermore, the limiting structure includes an annular block and a pin. The annular block is provided at the connection between the branch cavity and the guide cavity. The annular block has a through hole in the middle that allows the thin rod section to pass through. A limiting section is provided between the thick rod section and the middle sealing ring mounting section. The pin passes through the cavity wall of the branch cavity and is located at the movement path of the limiting section to limit the inward and outward travel of the button body.

[0014] Furthermore, the inner water channel has a limiting protrusion on its outer periphery and a limiting step in the guide cavity. After the inner water channel is installed in the guide cavity, the limiting protrusion abuts against the limiting step to achieve axial positioning of the inner water channel relative to the T-shaped outer shell. The inner water channel also has at least one limiting protrusion on its outer periphery, which matches at least one positioning groove in the guide cavity to achieve circumferential positioning of the inner water channel relative to the T-shaped outer shell.

[0015] Furthermore, the first water outlet chamber is either connected or internally equipped with a bubble core to form a first water outlet mode.

[0016] Furthermore, the second water outlet chamber is an annular water outlet chamber, and an annular water outlet panel is provided inside the second water outlet chamber to form a second water outlet mode. The aerator is fastened at the center of the annular water outlet panel to form a composite water outlet surface.

[0017] Furthermore, the first elastic element is a first spring, and the valve body includes a base and a valve body. The valve body has an axially extending inner cavity, a water passage that passes through the middle of the inner cavity laterally, and a positioning rod extending upward from the middle of the inner cavity. The middle of the first water outlet cavity has a water passage notch that communicates with the water passage. The front end of the valve shaft has a hollow seat, and the positioning rod is inserted into the seat. The first spring is located in the inner cavity and sleeved on the valve shaft. There is a gap between the seat of the valve shaft and the inner cavity. When the first spring is in a fully extended or basically extended state, the end face of the valve shaft leaves the outer edge of the inner cavity, so that the gap is opened outward to form the first water passage. When the button assembly pushes the valve shaft to move, the valve shaft compresses the first spring and presses against the outer edge of the valve body to close the first water passage.

[0018] Furthermore, a check valve is provided inside the water inlet chamber.

[0019] A concealed pull-out faucet includes a faucet tube and the aforementioned concealed pull-out head, wherein the concealed pull-out head is retractably disposed inside the front end of the faucet tube and can be retracted and hidden inside the front end of the faucet tube when not in use.

[0020] Furthermore, the front end of the faucet tube has a notch in its wall, which corresponds to the branch cavity of the concealed pull-out head. When the concealed pull-out head is retracted into the front end of the faucet tube in a non-use state, the branch cavity is guided into the notch and serves as a handle for the user to remove the pull-out head.

[0021] Furthermore, the outer diameter of the front end of the faucet pipe is smaller than the outer diameter of the front end of the faucet pipe of a similar pull-out faucet that uses a built-in independent water circuit module.

[0022] Compared with the prior art, the present invention has at least the following beneficial effects: Miniaturization of pull-out faucets is achieved while ensuring basic water flow area requirements: This invention does not rely solely on thinning parts or reducing the size of flow channels to achieve miniaturization. Instead, it optimizes the water path configuration by directly constructing a second water flow path through the space between the outer wall of the internal water channel and the inner wall of the T-shaped outer shell guide cavity. This allows the pull-out faucet shell to simultaneously participate in forming the water path, transforming the space originally used only for assembly into an effective water flow space. This fundamentally reduces the number of internal components and the amount of space superposition, thereby effectively reducing the overall size of the pull-out faucet. Therefore, while meeting the basic water flow area and water flow capacity requirements, the overall volume of the pull-out faucet can be further compressed. This is beneficial for the slimmer front design of concealed pull-out faucets, achieving a slimmer, simpler, and more aesthetically pleasing faucet front shape, and expanding the product's applicable scenarios.

[0023] Maintaining a compact structure under multi-mode water dispensing conditions: This invention not only needs to meet the miniaturization of the pull-out head, but also needs to accommodate the switching requirements between the first and second water dispensing modes. Through the composite layout of the central first water dispensing chamber and the peripheral second water dispensing chamber, combined with the reasonable arrangement of the button assembly, valve core assembly, and second water passage, the pull-out head can achieve at least two water dispensing modes in a small space, demonstrating good structural integration.

[0024] Achieving stable and reliable water circuit switching: A button assembly moves the valve shaft, and the continuous pressure exerted on the valve shaft end by the water flow in the second water circuit enables the second water circuit to maintain its open position. After water supply stops, the first elastic element drives the valve shaft to reset and restore the first water circuit. This switching method eliminates the need for complex mechanical locking structures, resulting in a simple and reliable design. It achieves at least two water output modes within a small space, meeting usage requirements while contributing to a compact overall structure. Attached Figure Description

[0025] Figure 1 This is an exploded view of Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the assembly of the internal waterway and the T-shaped outer shell in Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of the internal waterway and retaining spring assembly in Embodiment 1 of the present invention; Figure 4 This is a perspective sectional view of the internal waterway and T-shaped outer shell after assembly according to Embodiment 1 of the present invention; Figure 5 This is a cross-sectional view of the internal waterway in Embodiment 1 of the present invention; Figure 6 This is a schematic diagram of the assembly process according to Embodiment 1 of the present invention; Figure 7 This is a cross-sectional schematic diagram of the first water outlet state in Embodiment 1 of the present invention; Figure 8 This is a cross-sectional schematic diagram of the water outlet state switching process in Embodiment 1 of the present invention; Figure 9 This is a cross-sectional schematic diagram of the second water outlet state in Embodiment 1 of the present invention; Figure 10 This is an exploded view diagram of Embodiment 2 of the present invention; Figure 11 This is a cross-sectional schematic diagram of the first water outlet state in Embodiment 2 of the present invention; Figure 12 This is a cross-sectional schematic diagram of the second water outlet state in Embodiment 2 of the present invention; Figure 13 This is a schematic diagram illustrating the recovery of the hidden state in Embodiment 3 of the present invention; Figure 14 This is a schematic diagram of the water extraction method in Embodiment 3 of the present invention. Attached icon number

[0026] 10. Pull-out head; 1. T-shaped outer shell; 11. Guide cavity; 111. Limiting step; 112. Positioning groove; 12. Branch cavity; 2. Internal water channel; 21. Water inlet cavity; 211. Threaded structure; 22. Switching cavity; 221. Valve core cavity; 222. Switching guide hole; 23. First water outlet cavity; 231. First water passage; 232. First water path; 24. Second water passage; 25. Second water outlet cavity; 251. Water passage notch; 252. Second water path; 26. Limiting flange; 27. Limiting protrusion; 28. Embedded groove; 29. ​​Groove; 3. Valve core assembly; 31. Valve body; 311. Base; 312. Valve body; 313. Inner cavity; 314. Water passage; 315. Positioning rod; 32. Valve shaft; 321. Seat; 322. End face; 33. First spring; 4. Button assembly; 41. Button body; 411. Thin rod section; 412. Middle sealing ring mounting section; 413. Thick rod section; 414. Flange; 42. Second spring; 431. Snap ring; 4311. Expansion section; 432. Annular block; 4321. Perforation; 433. Pin; 44. Sealing ring; 415. Limiting section; 5. Aerator core; 6. Annular water outlet panel; 7. Check valve; 8. Pull-out faucet; 81. Faucet pipe; 811. Notch; 82. Water outlet pipe. Detailed Implementation

[0027] The present invention will now be described in further detail with reference to the accompanying drawings. It should be understood that the following embodiments are for illustrative purposes only and are not intended to limit the scope of protection of the present invention. All equivalent substitutions, improvements, or modifications made based on the concept of the present invention should fall within the scope of protection of the present invention.

[0028] It should be noted that the directional relationships such as "front end", "rear end", "inner side", "outer side", "axial", "radial", and "lateral" mentioned below are all based on the structural state shown in the attached drawings and the conventional usage state in this field. Example 1

[0029] like Figures 1 to 7 As shown, this embodiment provides a concealed pull-out head 10, which includes a T-shaped outer shell 1, an internal water channel 2, a valve core assembly 3, a button assembly 4, an aerator core 5, an annular water outlet panel 6, and a check valve 7.

[0030] The T-shaped outer shell 1 has an overall T-shaped structure, and it has a guide cavity 11 extending along the water outlet direction of the pull-out head 10 and a branch cavity 12 communicating with the guide cavity 11. In this embodiment, the branch cavity 12 is perpendicularly connected to the guide cavity 11. The guide cavity 11 is used to install the internal water channel 2; the branch cavity 12 branches off laterally from the guide cavity 11 and is used to install the button assembly 4, forming an operating part that is convenient for finger pressure in actual use. Unlike the outer shell in the prior art, which is simply a covering, the T-shaped outer shell 1 in this embodiment not only serves the appearance and support functions, but also forms a second water passage 24 and a second water outlet cavity 25 together with the internal water channel 2. Thus, the outer shell 1 itself participates in forming part of the water channel, reducing the space occupied by the independent built-in water channel module, which is conducive to the overall miniaturization of the hidden pull-out head 10.

[0031] The internal water channel 2 is installed within the guide cavity 11 of the T-shaped outer shell 1 and extends axially along the guide cavity 11. The internal water channel 2 includes a water inlet cavity 21, a switching cavity 22, and a first water outlet cavity 23 that pass through it sequentially. The switching cavity 22 forms a transversely inserted valve core cavity 221 for installing the valve core assembly 3. The side wall corresponding to the end of the valve core cavity 221 is provided with a switching guide hole 222, which corresponds to the branch cavity 12 after assembly. The water inlet cavity 21 is located at the rear end of the internal water channel 2, and its outer wall is provided with a threaded structure 211 for connecting with the water outlet pipe 82 of the pull-out faucet 8, so as to realize the fixed connection and water flow between the pull-out head 10 and the faucet pipe 82 that can be flexibly pulled out inside the pull-out faucet 8. The first water outlet cavity 23 is located in the middle area of ​​the front end of the internal water channel 2 and is used to form a first water outlet mode.

[0032] The inner water channel 2 has a limiting flange 26 on its outer periphery, and a limiting step 111 is provided in the guide cavity 11. After the inner water channel 2 is installed in the guide cavity 11, the limiting flange 26 abuts against the limiting step 111 to achieve axial positioning of the inner water channel 2 relative to the T-shaped outer shell 1. Furthermore, the inner water channel 2 also has at least one limiting protrusion 27 on its outer periphery, and at least one matching positioning groove 112 is provided in the guide cavity 11. After the limiting protrusion 27 is embedded in the positioning groove 112, the inner water channel 2 can be circumferentially positioned relative to the T-shaped outer shell 1. Through the combined effect of axial positioning and circumferential positioning, it can be ensured that the inner water channel 2 is accurately assembled in the guide cavity 11 and the switching guide hole 222 is accurately oriented towards the branch cavity 12, so that the button assembly 4, the switching guide hole 222, and the valve shaft 32 are accurately aligned, thereby ensuring reliable switching action.

[0033] The valve core assembly 3 is installed in the valve core cavity 221 and includes a valve body 31, a valve shaft 32, and a first elastic element. The first elastic element is preferably a first spring 33. The valve body 31 includes a base 311 and a valve body 312. The valve body 312 has an axially extending inner cavity 313, a water passage 314 that passes through the middle of the inner cavity 313 laterally, and a positioning rod 315 that extends upward from the middle of the inner cavity 313. The middle of the first water outlet cavity 23 has a water passage notch 251 that communicates with the water passage 314. The front end of the valve shaft 32 has a hollow seat 321. The positioning rod 315 is inserted into the seat 321. The first spring 33 is located in the inner cavity 313 and is sleeved on the outside of the seat 321 of the valve shaft 32. A gap is left between the seat 321 and the inner cavity 313.

[0034] The valve core assembly 3 is installed in the valve core cavity 221 from the direction of the valve shaft 32. When the first spring 33 is in a fully extended or nearly fully extended state, the valve shaft 32 is in its initial position under the elastic force of the first spring 33, such as... Figure 7 As shown, at this time, the end face 322 of the valve shaft 32 closes the switching guide hole 222, and the end face 322 of the valve shaft 32 leaves the outer edge of the inner cavity 313, so that the gap is open to the outside to form the first water passage 231. Thus, the water flow in the inlet cavity 21 can flow forward along the first water passage 231 formed between the valve body 31 and the valve shaft 32, and enter the first outlet cavity 23 through the water passage 314 of the valve body 312 and the water passage notch 251 in the middle of the first outlet cavity 23, forming the first water path 232.

[0035] In this embodiment, the first water outlet chamber 23 is either conductively or internally configured with a foaming core 5 to form a first water outlet mode. Preferably, the foaming core 5 is located at the middle of the front end of the pull-out head 10 and is directly connected to the first water outlet chamber 23, so that the water flow corresponding to the first water path 232 forms a gentler bubbly water flow after passing through the foaming core 5, which serves as the default water outlet mode of the pull-out head 10.

[0036] After the internal water channel 2 is installed in the guide cavity 11 of the T-shaped outer shell 1, a second water passage 24 is formed between its outer wall and the inner wall of the guide cavity 11, and a second water outlet cavity 25 is formed at the front end. The second water outlet cavity 25 is preferably an annular water outlet cavity, arranged around the first water outlet cavity 23. An annular water outlet panel 6 is provided in the second water outlet cavity 25 to form a second water outlet mode. Preferably, the aerator 5 is fastened at the center of the annular water outlet panel 6, thereby forming a composite water outlet surface at the front end of the pull head 10, that is, the middle part is the first water outlet area corresponding to the aerator 5, and the outer part is the second water outlet area corresponding to the annular water outlet panel 6. In this way, two water outlet modes can be integrated in a small space at the front end of the pull head 10, which is beneficial to both functionality and miniaturization requirements.

[0037] The button assembly 4 is repositionably and sealed within the branch cavity 12. The button assembly 4 includes a button body 41, a second elastic element, and a limiting structure 43. The button body 41 includes a front thin rod section 411, a middle sealing ring mounting section 412, and a rear thick rod section 413. The middle sealing ring mounting section 412 is provided with a sealing ring 44. The second elastic element is preferably a second spring 42, which is sleeved on the outer periphery of the thin rod section 411 and limited by the limiting structure. The thin rod section 411 passes through the limiting structure and extends towards the valve shaft 32. The thick rod section 413 is located at the outer end of the button body 41, facilitating user finger pressing.

[0038] In this embodiment, the limiting structure is preferably a retaining spring 431. Correspondingly, the outer wall of the internal waterway 2 is provided with an embedding groove 28 and an axially extending groove 29 next to the switching guide hole 222, and the retaining spring 431 is installed in the embedding groove 28 and the groove 29. The front end of the retaining spring 431 is provided with an expansion portion 4311, and the front end of the thin rod segment 411 is provided with a flange 414, the lateral dimension of which is larger than the opening size of the expansion portion 4311. During assembly, the retaining spring 431 is installed in the embedding groove 28 and the groove 29, and the expansion portion 4311 is sleeved on the outer periphery of the thin rod segment 411, limiting the flange 414 at the front end of the thin rod segment 411. During the inward and outward movement of the button body 41, the flange 414 is limited by the retaining spring 431 to prevent the button body 41 from disengaging from the branch cavity 12.

[0039] The second spring 42 provides the elastic force for the button body 41 to return to its original position. When the user presses the thicker segment 413, the button body 41 moves as a whole toward the inside of the branch cavity 12, as... Figure 8 As shown, the second spring 42 is compressed in the branch cavity 12, and the front end of the thin rod segment 411 pushes the end face 322 of the valve shaft 32, causing the valve shaft 32 to leave the switching guide hole 222 and compress the first spring 33. At the same time, the end face 322 of the valve shaft 32 presses against and abuts the corresponding outer edge of the inner cavity 313 of the valve body 31, thereby closing the first water passage 231 originally formed between the valve shaft 32 and the valve body 31. At this time, the first water passage 232 is cut off, and the water in the inlet cavity 21 no longer flows to the first outlet cavity 23, but enters the second water passage 24 formed between the outer wall of the internal water channel 2 and the inner wall of the guide cavity 11 through the switching guide hole 222, and continues to flow to the second outlet cavity 25, and is discharged by the annular outlet panel 6, thereby forming the second water passage 252 and the second outlet mode. Since the second water outlet chamber 25 is an annular water outlet chamber and its front end is provided with an annular water outlet panel 6, the water flow output from the second water channel 252 can form a shower-like or spray-like water outlet effect.

[0040] Furthermore, since the water flowing through the second water passage 24 continuously applies pressure to the end face 322 of the valve shaft 32, this pressure keeps the valve shaft 32 in the position of compressing the first spring 33 and opening the switching guide hole 222, thereby keeping the second water passage 252 continuously open. In other words, even if the user releases the button assembly 4 while the faucet is supplying water, the valve shaft 32 can still maintain the state of the second water passage 252 under the action of water pressure. After the upstream water supply is turned off, the pressure in the second water passage 24 disappears, the first spring 33 rebounds and drives the valve shaft 32 to reset, the end face 322 of the valve shaft 32 re-closes the switching guide hole 222, and at the same time, the first water passage 231 is re-formed between the valve shaft 32 and the valve body 31, so that the pull head 10 returns to the initial state corresponding to the first water passage 232.

[0041] The button body 41 is designed such that, throughout the entire process of the button body 41 moving inward and outward, the sealing ring 44 on the middle sealing ring mounting section 412 is always located inside the branch cavity 12 and maintains a sealing fit with the inner wall of the branch cavity 12, thereby preventing water from leaking out along the button assembly 4 and ensuring the sealing of the branch cavity 12 and the stability of the button action; the thick rod section 413 is always at least partially or completely exposed in the branch cavity 12 to form an operating part for the user to press, so that the pressing force applied by the user can be stably transmitted to the thin rod section and further act on the valve shaft, thereby improving the responsiveness of the valve core switching action.

[0042] Furthermore, a check valve 7 is provided inside the water inlet chamber 21. The check valve 7 allows water to flow from the outlet pipe 82 of the faucet pipe 8 into the pull-out head 10, while preventing the water inside the pull-out head 10 from flowing back. This not only improves the stability and safety of the water circuit, but also helps maintain a stable water flow direction during the switching process, reducing the adverse effects of abnormal backflow on the valve core switching logic.

[0043] Therefore, this embodiment uses the T-shaped outer shell 1 and the internal water channel 2 to jointly enclose the second water passage 24 and the second water outlet chamber 25, avoiding the traditional pull-out head 10 structure that requires an independent water channel module to be stuffed inside the outer shell, thus significantly reducing the number of internal parts and space occupied by the pull-out head 10. Furthermore, by combining the button assembly 4 to switch the valve shaft 32, maintaining continuous water pressure in the second water channel 252, and a combined central aerator and peripheral showerhead water outlet design, the pull-out head 10 maintains two water outlet functions and sufficient water passage capacity while reducing the overall front-end size, making it particularly suitable for miniaturized designs of concealed pull-out faucets. Example 2

[0044] In another embodiment, such as Figure 10-12 As shown, the limiting structure includes an annular block 432 and a pin 433.

[0045] Specifically, an annular block 432 is provided at the connection between the branch cavity 12 and the guide cavity 11. The annular block 432 has a through hole 4321 in the middle to allow a thin rod segment 411 to pass through. The annular block 432 can be integrally formed on the inner wall of the branch cavity, or it can be fixedly installed in the branch cavity as a separate part. The thin rod segment 411 of the button body 41 extends towards the valve shaft 32 after passing through the through hole 4321.

[0046] A limiting section 415 is provided between the thick rod section 413 and the central sealing ring. The pin 433 passes through the cavity wall of the branch cavity 12 and is located at the movement path of the limiting section 415. When the button body 41 moves inward, the cooperation between the limiting section 415 and the pin 433 can limit its maximum inward movement stroke, preventing excessive internal pressure on the button body 41 and damage to the thin rod section, valve shaft, or first elastic element; when the button body 41 moves outward, the cooperation between the limiting section 415 and the pin 433 in the other direction can limit its maximum outward movement stroke, preventing the button body 41 from disengaging from the branch cavity. Example 3

[0047] like Figure 13-14 As shown, this embodiment provides a concealed pull-out faucet 8, which includes a faucet tube 8 and a concealed pull-out head 10 as described in Embodiment 1 or Embodiment 2. The concealed pull-out head 10 is retractably disposed inside the front end of the faucet tube 8 and can retract and hide inside the front end of the faucet tube 8 when not in use.

[0048] Specifically, the rear end of the concealed pull-out head 10 is connected to the internal connection structure of the front end of the flexibly movable water outlet pipe 82 inside the faucet pipe 8 via a threaded structure 211 on the outer wall of the water inlet cavity 21. This achieves both mechanical fixation and water supply continuity between the pull-out head 10 and the faucet pipe 8. When in use, the pull-out head 10 can be pulled outwards from the front end of the faucet pipe 8 to expand the rinsing range; when not in use, it can retract and hide along the inner cavity of the front end of the faucet pipe 8. Because the concealed pull-out head 10 of this invention uses a design where the outer shell participates in forming part of the water channel, it reduces the space occupied by traditional independent built-in water channel modules. Therefore, the overall size of the pull-out head 10 is smaller, especially the front end size, which is effectively reduced, allowing the front end of the faucet pipe 8 to accommodate the pull-out head 10 in its retracted state without significant thickening.

[0049] In this embodiment, the front wall of the faucet tube 8 is provided with a notch 811, which corresponds to the branch cavity 12 of the concealed pull-out head 10. When the pull-out head 10 retracts into the front end of the faucet tube 8, the branch cavity 12 of the pull-out head 10 is guided into the notch 811. Thus, on the one hand, the notch 811 provides clearance and guidance space for the branch cavity 12, so that the branch cavity 12 of the T-shaped housing 1 can be adapted to the shape of the front end of the faucet tube 8 in the retracted state; on the other hand, when the pull-out head 10 needs to be used, the branch cavity 12 can become a handle end, and the user can directly pull the branch cavity 12 to make the pull-out head 10 quickly and accurately pulled out from the front end of the faucet tube 8. Since the branch cavity 12 itself is the lateral protrusion where the button assembly 4 is located, there is no need to set up an additional special exposed handle structure, which helps to keep the appearance of the front end of the faucet tube 8 simple.

[0050] Furthermore, the notch 811 can also guide the retraction posture of the branch cavity 12, so that the pull head 10 maintains a predetermined angle and position when it retracts and hides inside the front end of the faucet tube 8, thereby facilitating subsequent extraction and improving the overall consistency of the machine.

[0051] Because the pull-out head 10 itself has a miniaturized structure, the outer diameter of the front end of the faucet pipe 8 can be smaller than the outer diameter of the front end of the faucet pipe of a similar pull-out faucet that uses a built-in independent water circuit module. In other words, while ensuring that the pull-out head 10 has a first water outlet mode and a second water outlet mode, and can be retracted for concealed storage, this invention allows for a slimmer and more compact structural design at the front end of the faucet pipe 8. Compared to the existing technology where the front end has to be made thicker to accommodate a larger pull-out head 10, this invention is more conducive to achieving a thinner, more refined, and space-appropriate product appearance, and can meet more installation environments and aesthetic needs.

[0052] In summary, the concealed pull-out faucet 8 described in this embodiment utilizes the miniaturized concealed pull-out head 10 structure in Embodiment 1, allowing the pull-out head 10 to retract and hide inside the front end of the faucet pipe 8 with a smaller outer diameter when not in use. The convenience of extraction is improved through the cooperation of the notch 811 and the branch cavity 12, ultimately achieving a concealment effect, an aesthetic effect, and a multi-mode water dispensing function.

[0053] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A concealed pull-out head, characterized in that, include: A T-shaped housing, wherein the T-shaped housing is provided with a guide cavity and a branch cavity communicating with the guide cavity; An internal water channel includes an inlet chamber, a switching chamber, and a first outlet chamber that are connected in sequence. The switching chamber forms a valve core chamber. The side wall of the valve core chamber is provided with a switching guide hole. The outer wall of the inlet chamber is provided with a threaded structure for connecting with the outlet pipe of a pull-out faucet. A valve core assembly, the valve core assembly including a valve body, a valve shaft and a first elastic element, the valve shaft being movably engaged with the valve body and forming a first water passage under the action of the first elastic element; The valve core assembly is installed in the valve core cavity. When the first elastic element is in a stretched or basically stretched state, the valve shaft closes the switching guide hole. The first water passage connects the water inlet cavity and the first water outlet cavity to form a first water path. The internal water channel is installed in the guide cavity and forms a second water passage and a second water outlet cavity with the inner wall of the guide cavity. The switching guide hole is correspondingly provided with the branch cavity. The branch cavity is provided with a movable button assembly, which is used to push the valve shaft to open the switching guide hole and compress the first elastic element to close the first water passage, so that the water flows through the switching guide hole into the second water passage and is output from the second water outlet cavity to form a second water path; and the water flow in the second water passage is used to apply a force to the valve shaft to keep it open to the switching guide hole.

2. The concealed pull-out head according to claim 1, characterized in that: The button assembly includes a button body, a second elastic element, and a limiting structure. The button body includes a front thin rod section, a middle sealing ring mounting section, and a rear thick rod section. The middle sealing ring mounting section is provided with a sealing ring. The second elastic element is sleeved on the outer periphery of the thin rod section and limited by the limiting structure. The thin rod section passes through the limiting structure. When the thick rod section is subjected to force and moves inward, it drives the thin rod section to push the valve shaft away from the switching guide hole and compress the second elastic element. After the external force is released, the second elastic element rebounds and drives the button body to move outward. During the entire process of the button body moving inward and outward, the sealing ring is always located in the branch cavity and remains sealed, and the thick rod section is always at least partially exposed in the branch cavity to form an operating part for the user to press.

3. The concealed pull-out head according to claim 2, characterized in that: The outer wall of the internal waterway is provided with an embedding groove and an axially extending groove next to the switching guide hole. The limiting structure is a retaining spring. The front end of the retaining spring is provided with an expansion portion. The front end of the thin rod segment is provided with a flange. The lateral dimension of the flange is larger than the opening size of the expansion portion. The expansion portion is sleeved on the outer periphery of the thin rod segment. The retaining spring is installed in the embedding groove and the groove so that the flange is limited by the retaining spring during the inward and outward movement of the button body.

4. The concealed pull-out head according to claim 2, characterized in that: The limiting structure includes an annular block and a pin. The annular block is provided at the connection between the branch cavity and the guide cavity. The annular block has a through hole in the middle that allows the thin rod section to pass through. A limiting section is provided between the thick rod section and the middle sealing ring mounting section. The pin passes through the cavity wall of the branch cavity and is located at the movement path of the limiting section to limit the inward and outward travel of the button body.

5. The concealed pull-out head according to claim 1, characterized in that: The inner water channel has a limiting protrusion on its outer periphery and a limiting step in the guide cavity. After the inner water channel is installed in the guide cavity, the limiting protrusion abuts against the limiting step to achieve axial positioning of the inner water channel relative to the T-shaped outer shell. The inner water channel also has at least one limiting protrusion on its outer periphery, which matches at least one positioning groove in the guide cavity to achieve circumferential positioning of the inner water channel relative to the T-shaped outer shell.

6. The concealed pull-out head according to claim 1, characterized in that: The first water outlet chamber is either connected or has a built-in bubble core to form the first water outlet mode.

7. The concealed pull-out head according to claim 6, characterized in that: The second water outlet chamber is an annular water outlet chamber, and an annular water outlet panel is provided inside the second water outlet chamber to form a second water outlet mode. The aerator is fastened at the center of the annular water outlet panel to form a composite water outlet surface.

8. The concealed pull-out head according to claim 1, characterized in that: The first elastic element is a first spring. The valve body includes a base and a valve body. The valve body has an axially extending inner cavity, a water passage that passes through the middle of the inner cavity laterally, and a positioning rod extending upward from the middle of the inner cavity. The middle of the first water outlet cavity has a water passage notch that communicates with the water passage. The front end of the valve shaft has a hollow seat. The positioning rod is inserted into the seat. The first spring is located in the inner cavity and sleeved on the valve shaft. There is a gap between the seat of the valve shaft and the inner cavity. When the first spring is in a fully extended or nearly fully extended state, the end face of the valve shaft leaves the outer edge of the inner cavity, so that the gap opens outward to form the first water passage. When the button assembly pushes the valve shaft to move, the valve shaft compresses the first spring and presses against the outer edge of the valve body to close the first water passage.

9. The concealed pull-out head according to claim 1, characterized in that: The inlet chamber is equipped with a check valve.

10. A concealed pull-out faucet, characterized in that, It includes a faucet tube and a concealed pull-out head as described in any one of claims 1 to 9, wherein the concealed pull-out head is retractably disposed inside the front end of the faucet tube and can be retracted and hidden inside the front end of the faucet tube when not in use.

11. The concealed pull-out faucet according to claim 10, characterized in that: The front end of the faucet tube has a notch, which corresponds to the branch cavity of the concealed pull-out head. When the concealed pull-out head is retracted into the front end of the faucet tube in the non-use state, the branch cavity is guided into the notch and serves as a handle end for the user to remove the pull-out head.

12. The concealed pull-out faucet according to claim 10, characterized in that: The outer diameter of the front end of the faucet pipe is smaller than the outer diameter of the front end of the faucet pipe of a similar pull-out faucet that uses a built-in independent water circuit module.

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