Hidden water outlet constant temperature backrest and bathtub

Abstract

The application provides a hidden water outlet constant temperature backrest and a bathtub, which comprises a backrest body, an internal water flow channel, a lower water outlet part, a water inlet interface for connecting a constant temperature water supply pipeline, a height adjusting assembly comprising a support pipe and a locking part, the support pipe being axially movable to adjust the installation height of the backrest body and being locked by the locking part, an angle adjusting assembly comprising a transversely arranged connecting pipe and a one-way locking mechanism, the connecting pipe penetrating the backrest body and being connected with the one-way locking mechanism, so that the backrest body can rotate around the axis of the connecting pipe in a single direction to adjust the water outlet angle and the reverse rotation is prevented by the one-way locking mechanism, and a table top fixing assembly. The support pipe and the connecting pipe form a water inlet passage and are communicated with the internal water flow cavity of the backrest body, and water flows out through the water outlet part. The application solves the problem that the user is prone to chilling during the water injection period of a walk-in bathtub, realizes constant temperature heat preservation without electricity through a hidden waterway, and the height and angle are adjustable, which is suitable for different user needs.

Description

Technical Field

[0001] This invention relates to the field of bathroom equipment technology, and in particular to a concealed water outlet thermostatic pillow and bathtub. Background Technology

[0002] With the improvement of people's living standards and the acceleration of the aging process, bathing is no longer limited to cleaning the body, but also carries the functions of relaxing the mind and body and health care and therapy. Moreover, the requirements for safety and convenience are becoming increasingly prominent.

[0003] In terms of enhancing bathing comfort, existing technologies offer a variety of bathtubs with massage water jet functions. For example, patent document CN1886081B discloses a bathtub with interchangeable accessories, which uses a water pipe connector on the upper wall of the bathtub and detachable neck and shoulder water jet accessories to spray water onto the neck and shoulders of the bather to achieve a hydrotherapy massage effect. Patent document CN115282020A discloses a bathtub with an adjustable water jet headrest, whose water jet can move up and down along the backrest to accommodate bathers of different heights, providing spray and heat to the neck and shoulders. In addition, CN121059034A, CN215424298U, etc., also disclose backrest structures with integrated water jet functions or easy cleaning.

[0004] However, the water outlets of the aforementioned bathtubs or tubs with hydrotherapy or massage functions are directly or indirectly connected to the bathtub's water supply system. Typically, the tub needs to be filled with water or reach a certain water level before the spray is activated using a circulation pump or water supply line. For traditional one-piece elevated tubs, users must first fill the tub with water and then cross a high threshold to enter. This may not be difficult for younger people, but it poses a significant safety hazard to the elderly and people with mobility impairments.

[0005] To address the safety concerns of entering and exiting bathtubs, walk-in bathtubs (also known as door bathtubs) have emerged. For example, patent document CN201360982Y discloses a bathtub designed for convenient bathing. By providing an opening on one side of the tub and installing a door with a sealing strip, it allows users to step directly into the tub from the floor and sit down when the tub is empty, without requiring a dangerous stepping motion. This design greatly enhances the safety of people with mobility impairments entering and exiting the tub.

[0006] While walk-in bathtubs have solved the problem of difficulty in getting in and out, they introduce a fundamental contradiction in their structure: to ensure watertightness, the bathtub door must be tightly closed before water can be added. This forces users to sit in an empty, cold tub while waiting for the water to fill. Although current technology can reduce the filling time to about five minutes by improving the faucet structure to increase the flow rate (the so-called rapid filling technology), during this time, elderly users are easily exposed to the air after their skin becomes wet, making them highly susceptible to catching a cold due to heat absorption from evaporation, and even triggering cardiovascular stress.

[0007] To address the issue of catching a cold during the waiting period, the industry has explored solutions using electric heated seats or bathroom heaters for auxiliary heating. However, this introduces new and potentially fatal risks: the risk of electric shock in the humid bathroom environment and the risk of skin burns or fires caused by high temperatures. Furthermore, the efficiency of rapid water filling is highly dependent on the water pressure of the residential network and the power of the water heater. In older communities or when the inlet water temperature is extremely low in winter, the filling time can be significantly prolonged, leaving users still unable to avoid catching a cold. Summary of the Invention

[0008] In view of the shortcomings of the prior art described above, the technical problem to be solved by the present invention is to provide a concealed water outlet constant temperature backrest and bathtub, so that the elderly and people with mobility impairments can bathe safely and comfortably, and avoid physical injuries caused by falls, slips, or catching a cold.

[0009] This invention proposes a concealed water-discharge thermostatic backrest pillow, comprising: a pillow body with an internal water flow channel, and a water outlet at the lower part of the pillow body communicating with the water flow channel; a water inlet for connecting to a thermostatic water supply pipeline; a height adjustment assembly connected between the water inlet and the pillow body; the height adjustment assembly includes at least one support pipe and a locking part cooperating with the support pipe, the support pipe moving axially relative to the locking part to adjust the installation height of the pillow body relative to the bathtub countertop, and the locking part locking the support pipe at the adjusted height position; an angle adjustment assembly including a horizontally arranged connecting pipe and a one-way locking mechanism, the one-way locking mechanism being embedded in the pillow body, and the connecting pipe passing through the pillow body and the one-way locking mechanism; and a countertop fixing assembly for fixing the entire backrest pillow to the bathtub countertop; wherein the support pipe and the connecting pipe together form a water inlet passage, and the water inlet passage communicates with a water passage cavity inside the pillow body.

[0010] Preferably, there are two support pipes, which are symmetrically arranged on the left and right sides of the pillow body; the two ends of the connecting pipe are respectively connected to the support pipes, one support pipe is fixedly connected to the connecting pipe, and the other support pipe is threadedly connected to the connecting pipe; wherein, the support pipe fixed to the connecting pipe is a water pipe, and its lower end is connected to the water inlet.

[0011] Preferably, the connecting pipe has an axially extending inner hole, one end of which is connected to the water pipe and the other end is a closed end; the pipe wall of the connecting pipe is provided with a water outlet hole that connects the inner hole to the water flow channel inside the pillow body.

[0012] Preferably, the one-way locking mechanism includes a ratchet fixed relative to the pillow body and a pawl that is circumferentially linked with the connecting tube. The pawl engages with the ratchet in one direction, so that when the pillow body is subjected to pressure from the user's neck, it rotates around the connecting tube in the single direction and is locked at the current angle, and the pawl prevents the pillow body from rotating in the opposite direction.

[0013] Preferably, the angle adjustment assembly further includes a positioning disk fixedly sleeved on the connecting pipe, and the positioning disk and the pawl achieve circumferential limiting through a non-circular mating structure.

[0014] Preferably, a flow guide is fixedly provided inside the pillow body. The flow guide is sleeved on the outer periphery of the connecting pipe and forms a water flow chamber communicating with the water outlet of the connecting pipe. The water outlet is connected to the inner cavity of the flow guide so that water flows out of the pillow body through the water outlet.

[0015] Preferably, the water outlet is a slit-like opening extending laterally or a plurality of water outlet holes arranged in a row.

[0016] Preferably, the cross-sectional area of ​​the water flow chamber gradually decreases along the water flow direction.

[0017] Preferably, the locking part includes a connector sleeved on the outer periphery of the support tube and a locking nut screwed onto the connector. The locking nut has an elastic clamping part that contracts radially when tightened to clamp the support tube.

[0018] Another invention proposes a bathtub, including a tub body and a concealed water outlet thermostatic pillow as described in any of the above embodiments, wherein the concealed water outlet thermostatic pillow is installed on the top surface of the tub body via the tabletop fixing assembly.

[0019] As described above, the concealed water outlet thermostatic pillow and bathtub of the present invention have the following beneficial effects:

[0020] This invention utilizes a concealed water inlet channel formed by a support pipe and a connecting pipe to directly introduce constant-temperature water into the internal water passage chamber of the pillow body and allow it to flow out from the lower outlet. When applied to a walk-in bathtub, the user can turn on the constant-temperature water source while waiting for the water to fill, using the waterfall-like water flow from the lower part of the pillow body to continuously rinse the neck, chest, and back. This process relies entirely on the physical insulation of hot water circulation, eliminating the need for electric heating seats or bathroom heaters, fundamentally preventing the potential risks of electric shock and fire in damp environments. It also effectively prevents the elderly and people with mobility impairments from catching colds or experiencing cardiovascular stress due to prolonged waiting for water to fill.

[0021] This invention includes a height adjustment component and an angle adjustment component. The height adjustment component, through the cooperation of a locking part and a support tube, allows for free adjustment of the pillow's installation height relative to the bathtub surface, based on the user's height and the actual height of the bath stool inside the bathtub. The angle adjustment component, through the cooperation of a one-way locking mechanism and a connecting tube, allows the pillow to rotate in one direction to conform to the curve of the user's neck, and automatically locks the angle when natural pressure is applied to the neck, ensuring that the water outlet is always accurately positioned at the back of the neck. This design allows the same product to be widely adaptable to users of different heights and different bathtub models.

[0022] This invention conceals the water supply pipes within the support pipe and pillow body, resulting in a sleek and sophisticated appearance. Temperature-controlled water flows gently out in a waterfall-like pattern from the lower part of the pillow body after passing through the water chamber. This water can be used to supplement shower water for rinsing the neck and shoulders, or as a temperature-controlled spa water flow to gently massage the back of the neck, greatly enhancing the comfort and relaxation of bathing in a regular bathtub. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of a concealed water-discharge thermostatic pillow according to an embodiment of the present invention.

[0024] Figure 2 for Figure 1 A bottom view.

[0025] Figure 3 An exploded view of a concealed water-discharge thermostatic pillow according to an embodiment of the present invention.

[0026] Figure 4 This is an assembly diagram of a concealed water-discharge thermostatic pillow provided in an embodiment of the present invention.

[0027] Figure 5 for Figure 4 Sectional view at AA.

[0028] Figure 6 for Figure 5 A magnified view of section I.

[0029] Figure 7 for Figure 5 A magnified view of section II.

[0030] Figure 8 This is a schematic diagram of the structure of a bathtub provided in an embodiment of the present invention.

[0031] Figure 9 This is a side view of a bathtub provided according to an embodiment of the present invention.

[0032] Figure 10 for Figure 9 Sectional view at BB.

[0033] Figure 11 for Figure 10 A magnified view of section III.

[0034] Figure 12 for Figure 9 Sectional view at DD.

[0035] Explanation of reference numerals in the attached figures:

[0036] 100. Pillow body; 110. Water outlet; 120. Flow guide; 130. Water flow chamber; 150. Water passage chamber; 200. Water inlet; 300. Height adjustment assembly; 310. Support pipe; 320. Locking part; 321. Connector; 322. Locking nut; 400. Angle adjustment assembly; 410. Connecting pipe; 411. Water outlet; 420. One-way locking mechanism; 421. Ratchet; 422. Pawl; 430. Positioning plate; 500. Cylinder body. Detailed Implementation

[0037] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0038] It should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying drawings of this specification are merely for illustrative purposes to aid those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to the size, without affecting the effects and objectives achieved by the invention, should still fall within the scope of the technical content disclosed herein. Furthermore, the terms used in this specification, such as "upper," "lower," "left," "right," and "middle," are merely for clarity of description and are not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0039] like Figures 1 to 7As shown, an embodiment of a concealed water-cooled thermostatic backrest is provided. The backrest includes a pillow body 100, a water inlet 200, a height adjustment component 300, an angle adjustment component 400, and a tabletop fixing component. The pillow body 100 is a component for the user's head and neck to lean against, and it has a water passage cavity 150 inside, which guides the water flow. The lower part of the pillow body 100 has a water outlet 110 communicating with the water passage cavity 150. The water outlet 110 can be specifically configured as a slit-like opening extending laterally (i.e., parallel to the width direction of the bathtub countertop), or it can be configured as multiple water outlets arranged in a row, so that the water flows out evenly in a waterfall or curtain shape, covering the user's back of the neck, chest, and back area. In one embodiment, the pillow body 100 adopts a double-layer structure, including a soft outer layer and a hard inner layer. The soft outer layer is made of soft, elastic materials such as EVA, PU foam, or silicone to improve leaning comfort; the hard inner layer may be made of engineering plastics to provide structural support and accommodate at least a portion of the water passage cavity 150 and the angle adjustment assembly 400. The water passage cavity 150 is formed inside the hard inner layer, and the water outlet 110 penetrates through the soft outer layer and the hard inner layer.

[0040] In this embodiment, the water inlet 200 is used to connect to an external thermostatic water supply line. The thermostatic water supply line can come from a thermostatic faucet in the bathtub or a separate thermostatic mixing valve to provide a constant and adjustable flow of water to the pillow. The water inlet 200 is located at the lower end of the height adjustment assembly 300.

[0041] In this embodiment, the height adjustment component 300 is connected between the water inlet 200 and the pillow body 100, and is used to adjust the installation height of the pillow body 100 relative to the bathtub countertop to accommodate different user heights and different heights of the bath stool inside the bathtub. The height adjustment component 300 includes two support tubes 310 and two sets of locking parts 320. The two support tubes 310 extend vertically and are symmetrically arranged on the left and right sides of the pillow body 100. The support tubes 310 are preferably made of stainless steel tubing with a smooth outer surface to facilitate smooth sliding during height adjustment. Users can adjust and lock the height of the pillow body 100 according to their needs before or after bathing by simply loosening, adjusting, and tightening the screws.

[0042] In this embodiment, the angle adjustment component 400 is embedded in the pillow body 100 to adjust the tilt angle of the pillow body 100 so that the water outlet 110 is always aligned with the back of the user's neck. The angle adjustment component 400 includes a horizontally arranged connecting pipe 410 and two sets of one-way locking mechanisms 420. The connecting pipe 410 passes through the pillow body 100 horizontally (i.e., parallel to the width direction of the bathtub countertop) and is rotatably engaged with the pillow body 100. The connecting pipe 410 is preferably made of stainless steel, and its two ends are fixedly connected to the upper ends of the left and right side support pipes 310, respectively.

[0043] Specifically, such as Figure 3 As shown, the connecting pipe 410 has a first end and a second end. The first end is fixedly connected to the upper end of the left support pipe 310 by welding to form a sealed connection, ensuring the reliability of the water passage seal. The second end is detachably connected to the upper end of the right support pipe 310 by thread; for example, the outer wall of the second end has an external thread, and the upper end of the right support pipe 310 has a matching internal thread. This connection method, with welding on one side and threading on the other, facilitates product assembly, disassembly, and maintenance, and avoids the problems of interference or slippage that may occur when tightening with a double-threaded design.

[0044] In this embodiment, the support pipe 310 and the connecting pipe 410 together form a water inlet passage, which communicates with the water passage 150 inside the pillow body, so that water from the water inlet interface flows out through the water passage 150 and then out through the water outlet 110. Specifically, the connecting pipe 410 has an axially extending inner hole. One end of the inner hole (corresponding to the welding side) is in fluid communication with the upper end of the left support pipe 310, which serves as a water passage pipe, and the other end (corresponding to the threaded side) is a closed end or is blocked by the end face of the right support pipe 310. At least one water outlet hole is provided on the pipe wall of the connecting pipe 410, which communicates the inner hole of the connecting pipe 410 with the water passage 150 inside the pillow body 100.

[0045] In this embodiment, two sets of one-way locking mechanisms 420 are provided, respectively embedded in the ends of the pillow body 100. The connecting pipe 410 passes through the pillow body 100 and forms a rotational engagement with the one-way locking mechanism 420, so that the pillow body 100 rotates in a single direction around the axis of the connecting pipe 410 to adjust the water outlet angle.

[0046] When using, such as Figure 4 As shown, the user can rotate the pillow body 100 in one direction (upward) to a predetermined angle, aligning the water outlet 110 with the back of the user's neck. The user then rests their head and neck against the pillow body 100 and naturally applies pressure in the opposite direction of the pillow body's rotation (downward). Under the action of the one-way locking mechanism 420, the pillow body 100 is locked to ensure precise rinsing of the shoulders and neck. During the rinsing process, as... Figure 3 and Figure 5As shown, a constant-temperature water supply pipe is connected to the water inlet 200. The constant-temperature water flows through the water inlet 200 into the left-side support pipe 310, which serves as the water passage pipe. It then travels upwards along the support pipe 310 to the first end of the connecting pipe 410, entering the inner hole of the connecting pipe 410. The water flows laterally within the connecting pipe 410, exiting through the outlet holes on the pipe wall and entering the water passage cavity 150 inside the pillow body 100. The water passage cavity 150 is preferably wedge-shaped, meaning its cross-sectional area gradually decreases along the water flow direction (from top to bottom), creating a certain water pressure acceleration effect when the water flows out. Finally, the water flows outwards in a waterfall-like or curtain-like manner through the outlet 110 at the bottom of the pillow body 100, evenly sprinkling onto the user's neck, shoulders, and chest / back area. This embodiment can provide a safe, electricity-free, constant-temperature water flow while the walk-in bathtub is closed and waiting for water to be filled, effectively preventing the user from catching a cold; at the same time, its height and angle can be freely adjusted to suit users of different body shapes, combining excellent practicality and comfort.

[0047] It should be noted that, since the one-way locking mechanism 420 only allows rotation in one direction, the user cannot rotate the pillow body 100 back to its original position by directly turning it in the opposite direction. If the pillow body 100 needs to be adjusted back to its initial angle or a shallower angle, the user needs to use their hand to assist the pillow body 100 in continuing to rotate in that single direction. The pillow body 100 will rotate nearly one full turn (approximately 360°) around the connecting tube 410 before returning to its initial angle position.

[0048] The countertop mounting assembly is used to securely install the entire cushion onto the top countertop of the bathtub. This assembly is existing technology and will not be described in detail here.

[0049] In one embodiment, such as Figures 1 to 5 As shown, there are two support tubes 310, namely the first support tube and the second support tube. The two support tubes extend vertically and are symmetrically arranged on the left and right sides of the pillow body 100. The support tubes are preferably made of stainless steel round tubes, which have sufficient structural strength to support the pillow body 100 and the pressure on the user's head.

[0050] In this embodiment, the connecting pipe 410 extends laterally through the pillow body 100, and its two ends are respectively connected to the upper ends of the first support pipe and the second support pipe.

[0051] Specifically, the first support pipe and the connecting pipe 410 are fixedly connected. Preferably, the upper end of the first support pipe and the first end of the connecting pipe 410 are fixedly connected by welding. Welded connections have the advantages of high structural strength and reliable sealing performance, ensuring that the connection does not loosen or leak under long-term water pressure and mechanical vibration.

[0052] The second support tube and the connecting tube 410 are connected by a threaded detachable connection. Preferably, the inner wall of the second end of the connecting tube 410 is provided with an internal thread, and the upper end of the second support tube is provided with a matching external thread. The two are connected detachably by screwing them together. To facilitate tightening, the outer wall of the upper end of the second support tube may also be provided with knurling or a hexagonal wrench position.

[0053] In this embodiment, only the first support pipe serves as a water pipe, with its lower end connected to the water inlet 200 and its upper end in fluid communication with the inner hole of the connecting pipe 410. One end of the inner hole of the connecting pipe 410 (corresponding to the side of the first support pipe) is open and communicates with the interior of the first support pipe, while the other end (corresponding to the side of the second support pipe) is a closed end or is blocked by the upper end face of the second support pipe. The second support pipe serves only as a structural support component; its interior is either solid or hollow but closed at both ends, and it does not participate in water flow transportation.

[0054] During assembly, the first end of the connecting pipe 410 can be welded and fixed to the first support pipe to form a stable pre-assembled component; then, the pillow body 100 and the angle adjustment component 400 can be fitted onto the connecting pipe 410; finally, overcoming the elasticity of the soft outer layer of the pillow body 100, the second support pipe can be screwed into the second end thread of the connecting pipe 410, the pillow body 100 can be reset, and the overall assembly can be completed. This assembly sequence is clear and easy to operate, avoiding the problem of mutual interference or counter-rotation that may occur when tightening double-threaded connections, which may lead to difficulty in tightening.

[0055] In one embodiment, such as Figure 3 As shown, the connecting pipe 410 has an inner hole that extends or penetrates along its axial direction. One end of the inner hole (corresponding to the first end fixedly connected to the water pipe) is open and in fluid communication with the upper end of the first support pipe, which serves as the water pipe. The other end of the inner hole (corresponding to the second end connected to another support pipe) is closed.

[0056] In this embodiment, the closed end is formed in an optional implementation where the inner wall of the second end of the connecting pipe 410 is not through, but closed by the end wall surface of the pipe itself. In a preferred implementation, the inner wall of the second end of the connecting pipe 410 is provided with internal threads. When the upper external thread of the second support pipe 312 is screwed in, the end face of the second support pipe abuts against the bottom of the inner hole or the sealing gasket, forming an end face seal. This embodiment prefers the latter, that is, the inner hole is closed by using the end face of the threaded support pipe.

[0057] In this embodiment, at least one water outlet hole 411 is provided on the wall of the connecting pipe 410. The water outlet hole 411 penetrates the pipe wall radially along the connecting pipe 410, communicating with the inner hole 412 and the water passage cavity 150 inside the pillow body 100. The number of water outlet holes 411 can be one or more. When multiple outlet holes 411 are provided, they can be distributed at intervals along the axial and / or circumferential directions of the connecting pipe 410, so that water can enter each area of ​​the water passage cavity 150 evenly.

[0058] In use, the constant-temperature water from the inlet 200 flows upward through the first support pipe 311 and enters the inner hole from the first end of the connecting pipe 410. Since the other end of the inner hole is closed, the water flows outward through the outlet hole 411 on the pipe wall under pressure, enters the water passage cavity 150 inside the pillow body 100, and finally flows out from the outlet 110. This structure ensures that the water can only enter the pillow body through the outlet hole 411, avoiding the risk of water leakage from the other end of the connecting pipe 410, and at the same time simplifying the sealing structure design.

[0059] In one embodiment, such as Figures 3 to 7 As shown, the one-way locking mechanism 420 includes a ratchet 421, a pawl 422, and a positioning disc 423. The ratchet 421 is an internal gear ring structure, fixedly embedded in the mounting groove on the side wall of the pillow body 100, and circumferentially fixed with the pillow body 100. The pawl 422 is oscillatingly mounted inside the pillow body 100, and one end of it has a pawl portion that meshes with the internal teeth of the ratchet 421, and the pawl maintains a one-way meshing tendency with the internal teeth of the ratchet 421 through an elastic element. The positioning disc 423 is fixedly sleeved on the connecting pipe 410 and has a non-circular outer contour. The pawl 422 has a mounting hole that matches the outer contour, and the two are inserted and engaged to realize the circumferential linkage between the pawl 422 and the connecting pipe 410.

[0060] In use, the user first manually rotates the pillow body 100 around the connecting pipe 410 in one direction to a suitable water outlet angle. During this rotation, the pawl 422 slides along the teeth of the ratchet 421, allowing the pillow body 100 to rotate in one direction. When the user rests their head and neck on the pillow body 100 and applies downward pressure, this pressure causes the pawl 422 to engage tightly with the current tooth groove of the ratchet 421, thereby locking the pillow body 100 at the current angle position and preventing it from rotating in the opposite direction. To adjust the angle, the user must first lift their head and neck to release the pressure, and then continue to rotate the pillow body 100 in one direction by hand for adjustment; to reset, simply continue to rotate the pillow body 100 in that direction for approximately one full turn.

[0061] In one embodiment, such as Figure 3 and Figure 5As shown, a flow guide 120 is fixedly installed inside the pillow body 100. The flow guide 120 is preferably integrally formed with the rigid inner layer of the pillow body 100, or fixedly installed inside the rigid inner layer by means of clips, screws, etc. The flow guide 120 has a shell-like structure, with an internal receiving space opening towards the connecting pipe 410. The flow guide 120 is fitted around the outer periphery of the connecting pipe 410, and a certain gap is maintained between its inner wall and the outer wall of the connecting pipe 410; this gap constitutes the water flow chamber 130. The water outlet 411 of the connecting pipe 410 communicates with the inner hole of the connecting pipe 410 and the water flow chamber 130. The cross-sectional area of ​​the water flow chamber 130 gradually decreases along the water flow direction, i.e., it is wedge-shaped and narrows from top to bottom, so that the water flow generates a certain velocity increase effect when flowing through the water flow chamber 130. The lower end of the guide member 120 is provided with a guide outlet that communicates with the water flow chamber 130. The guide outlet is connected to the water outlet 110 at the lower part of the pillow body 100. The water outlet 110 is opened on the pillow body 100 and communicates with the inner cavity (i.e., the water flow chamber 130) of the guide member 120.

[0062] When in use, water from the inner hole of the connecting pipe 410 enters the water flow chamber 130 through the water outlet 411. After gathering in the water flow chamber 130, it is guided by the guide outlet at the lower end of the guide member 120 to the water outlet 110 of the pillow body 100, and finally flows out of the pillow body 100 in a waterfall or curtain shape, evenly sprinkling on the back of the user's neck and shoulder area.

[0063] In one embodiment, the water outlet 110 is located at the lower part of the pillow body 100 and communicates with the inner cavity (i.e., water flow chamber 130) of the guide member 120. In an alternative embodiment, the water outlet 110 is a slit-like opening extending laterally (i.e., parallel to the width direction of the bathtub countertop). The lateral length of the slit-like opening is greater than its vertical width, so that the water flows out in a waterfall-like pattern, evenly covering the user's neck and shoulder area. In another alternative embodiment, the water outlet 110 is a plurality of water outlets arranged in a row. The water outlets are spaced apart laterally, and the water flows out dispersedly through each water outlet, forming multiple fine water streams, which can also achieve even spraying of the user's neck and shoulder area.

[0064] In one embodiment, the locking part 320 includes a connector 321 sleeved around the outer periphery of the support tube 310 and a locking nut 322 screwed onto the upper end of the connector 321. The lower end of the connector 321 passes through a mounting hole in the bathtub countertop and engages with the countertop fixing assembly. The locking nut 322 has an elastic clamping part inside, which can be an open-type conical sleeve or a rubber bushing. When the user tightens the locking nut 322, the locking nut 322 compresses the elastic clamping part axially, causing the elastic clamping part to undergo radial contraction deformation, thereby locking the support tube 310 at the current height position. When the height needs to be adjusted, simply loosen the locking nut 322 in the opposite direction, and the elastic clamping part returns to its original shape, releasing the support tube 310, which can then slide freely axially relative to the locking part 320.

[0065] like Figures 8 to 12 As shown, an embodiment of a bathtub includes a tub body 500 and a concealed thermostatic water-filled headrest as described in any of the above embodiments. The tub body 500 has a bathing cavity for accommodating bathing water and a countertop surrounding the top periphery of the bathing cavity. At least one mounting hole (not shown) is provided on the countertop for the support tube 310 and locking part 320 of the height adjustment assembly 300 to pass through. The concealed thermostatic water-filled headrest is mounted on the top countertop of the tub body 500 via a countertop fixing assembly.

[0066] Specifically, the lower end of the connector 321 of the height adjustment component 300 passes through the mounting hole on the table, so that the stepped surface of the connector 321 abuts against the upper surface of the table. The locking nut of the table fixing component is tightened from below the table to the lower end of the connector 321, and together with the stepped surface, clamps the table, thereby firmly fixing the entire pillow.

[0067] The pillow 100 is suspended above the bathing chamber of the tub 500 and tilted towards the inside of the tub 500, so that the water outlet 110 is aimed at the back of the user's neck and shoulders when leaning back. The water inlet 200 is hidden under the countertop and is connected to the bathtub's thermostatic water supply system via pipes.

[0068] The bathtub in this embodiment is particularly suitable for walk-in bathtubs. After entering the tub 500 and closing the tub door, the user can turn on the constant temperature water source while waiting for the water to fill. The water flows out in a waterfall-like manner through the water outlet 110 of the concealed water-spraying constant temperature backrest, continuously spraying warm water on the user's neck, shoulders, chest, and back to keep them warm, effectively preventing them from catching a cold during the waiting period. Furthermore, no electric heating devices are required throughout the process, making it safe and reliable. For ordinary bathtubs, this backrest can provide a neck spa massage water flow during bathing, enhancing bathing comfort.

[0069] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A concealed water-discharge thermostatic pillow, characterized in that, include: The pillow body (100) has a water flow channel inside, and the lower part of the pillow body has a water outlet (110) that communicates with the water flow channel. Water inlet (200) is used to connect to a constant temperature water supply pipeline; A height adjustment assembly (300) is connected between the water inlet (200) and the pillow body (100); the height adjustment assembly (300) includes at least one support tube (310) and a locking part (320) that cooperates with the support tube. The support tube (310) moves axially relative to the locking part (320) to adjust the installation height of the pillow body (100) relative to the bathtub countertop. The locking part (320) can lock the support tube (310) at the adjusted height position. Angle adjustment assembly (400) includes a horizontally arranged connecting tube (410) and a one-way locking mechanism (420). The one-way locking mechanism (420) is embedded in the pillow body (100), and the connecting tube (410) passes through the pillow body (100) and the one-way locking mechanism (420). And a countertop fixing assembly for fixing the pillow to the bathtub countertop; The support pipe (310) and the connecting pipe (410) together form a water inlet passage, which is connected to the water passage cavity (150) inside the pillow body.

2. The concealed water-discharge thermostatic pillow according to claim 1, characterized in that, There are two support pipes (310), which are symmetrically arranged on the left and right sides of the pillow body (100); the two ends of the connecting pipe (410) are respectively connected to the support pipe (310), one support pipe (310) is fixedly connected to the connecting pipe, and the other support pipe is threadedly connected to the connecting pipe; wherein, the support pipe (310) fixed to the connecting pipe (410) is a water pipe, and its lower end is connected to the water inlet (200).

3. The concealed water-discharge thermostatic pillow according to claim 2, characterized in that, The connecting pipe (410) has an axially extending inner hole, one end of which is connected to the water pipe and the other end is a closed end; the pipe wall of the connecting pipe (410) is provided with a water outlet (411) that connects the inner hole to the water flow channel inside the pillow body.

4. The concealed water-discharge thermostatic pillow according to claim 1, characterized in that, The one-way locking mechanism (420) includes a ratchet (421) fixed relative to the pillow body and a pawl (422) circumferentially linked with the connecting tube. The pawl (422) engages with the ratchet (421) in one direction, causing the pillow body (100) to rotate around the connecting tube (410) in the one-way direction and be locked at the current angle when pressure is applied by the user's neck. The pawl (422) prevents the pillow body (100) from rotating in the opposite direction.

5. The concealed water-discharge thermostatic pillow according to claim 4, characterized in that, The angle adjustment assembly (400) also includes a positioning disk (430) fixedly sleeved on the connecting pipe (410), and the positioning disk (430) and the pawl (422) achieve circumferential limiting through a non-circular mating structure.

6. The concealed water-discharge thermostatic pillow according to claim 1, characterized in that, A flow guide (120) is fixedly installed inside the pillow body (100). The flow guide (120) is sleeved on the outer periphery of the connecting pipe (410) and forms a water flow chamber (130) communicating with the water outlet (140) of the connecting pipe. The water outlet (110) is connected to the inner cavity of the flow guide (120) so that water flows through the water outlet (110) to the outside of the pillow body (100).

7. The concealed water-discharge thermostatic pillow according to claim 6, characterized in that, The water outlet (110) is a slit-like opening extending laterally or a plurality of water outlet holes arranged in a row.

8. The concealed water-discharge thermostatic pillow according to claim 6, characterized in that, The cross-sectional area of ​​the water flow chamber gradually decreases along the direction of water flow.

9. The concealed water-discharge thermostatic pillow according to claim 1, characterized in that, The locking part (320) includes a connector (321) sleeved on the outer periphery of the support tube (310) and a locking nut (322) screwed onto the connector (321). The locking nut (322) is provided with an elastic clamping part that contracts radially when tightened to clamp the support tube.

10. A bathtub, characterized in that, It includes a cylinder (500) and a concealed water outlet thermostatic pillow as described in any one of claims 1 to 9, the concealed water outlet thermostatic pillow being mounted on the top surface of the cylinder (500) via the tabletop fixing assembly.

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