Instant water shut-off structure and overhead shower head

Abstract

An instant water shut-off structure and an overhead shower head. The instant water shut-off structure comprises: a water passage cavity (31), a variable chamber (32), a water flow channel (33), water outlet nozzles (121) and a switch valve (34), wherein the water passage cavity (31) is arranged between the water outlet nozzles (121) and the water flow channel (33); when water is supplied, the switch valve (34) communicates, under the action of the water pressure, the water passage cavity (31) with the water flow channel (33); and when the water is shut off, the switch valve (34) resets to disconnect the communication between the water passage cavity (31) and the water flow channel (33). When water is supplied, the variable chamber generates negative pressure to decrease the volume thereof; when the water is shut off, the negative pressure disappears, and the volume of the variable chamber increases; upon the water being shut off, residual water in the water passage cavity is sucked into the variable chamber through the water flow channel; and after a valve core of the switch valve disconnects the communication between the water flow channel and the water passage cavity, negative pressure is formed in the water passage cavity.

Description

A structure and overhead shower head capable of stopping water immediately after turning it off Technical Field

[0001] The present invention relates to bathroom products, in particular to a water outlet device. Background Art

[0002] Some existing showerheads feature a movable plate within the showerhead body that moves up and down within the cavity and seals the water outlet. This creates a pressure chamber between the plate and the outlet panel. When the showerhead is running and the buoyancy of the water in the pressure chamber is sufficient to lift the movable plate, water begins to flow. When the showerhead is shut off, the buoyancy of the water in the pressure chamber rapidly decreases, causing the movable plate to seal the outlet again, stopping the showerhead from dripping and preventing water from flowing after showering. Because the movable plate is heavy and needs to be lifted, water needs to be held in the pressure chamber for a period of time before the showerhead is running and water actually flows. This results in high startup pressure and delayed water flow.

[0003] To this end, Chinese patent CN216631236U discloses a water outlet device that utilizes the connection between a variable chamber and the water outlet chamber to relieve negative pressure when the water is turned off. This causes the variable chamber to expand, forming a negative pressure chamber that draws residual water from the water outlet chamber into the negative pressure chamber, achieving an instant stop effect. However, due to the wide variety of overhead showerhead models, each with varying diameters or areas, the amount of residual water that the variable chamber needs to draw in varies from one showerhead to another. Therefore, it is necessary to design different variable chambers for each showerhead, which is quite cumbersome. Summary of the Invention

[0004] The main technical problem to be solved by the present invention is to provide a structure that stops when the water is turned off, which can control the amount of residual water sucked into the variable chamber, thereby changing the vacuum degree of the water chamber after the water is turned off.

[0005] In order to solve the above technical problems, the present invention provides a structure for stopping water when it is turned off, comprising: a water passage chamber, a variable chamber, a water passage, a water outlet, and a switch valve; the water passage chamber is arranged between the water outlet and the water passage;

[0006] When water is flowing, the switch valve is acted upon by water pressure to connect the water flow chamber with the water flow channel; when the water is turned off, the switch valve is reset to disconnect the connection between the water flow chamber and the water flow channel; when water is flowing, the variable chamber generates negative pressure to reduce the volume of the variable chamber, and when the water is turned off, the negative pressure disappears and the volume of the variable chamber increases, so that the residual water in the water flow chamber is sucked into the variable chamber through the water flow channel when the water is turned off, and after the valve core of the switch valve disconnects the connection between the water flow channel and the water flow chamber, negative pressure is formed in the water flow chamber.

[0007] In a preferred embodiment, the variable chamber increases in volume by a stroke S1 when the water is turned off, and the valve core of the switch valve returns to its original position by a stroke S2 ​​when the water is turned off, and S1>S2.

[0008] In a preferred embodiment, the water flow channel includes an accelerating flow channel whose cross section becomes smaller along the water flow direction, and the connection point between the water flow channel and the variable chamber is located downstream of the accelerating flow channel along the water flow direction.

[0009] In a preferred embodiment: the switch valve also includes an adjusting member, which is used to adjust the stroke of the valve core returning to its original position when the water is turned off, thereby changing the volume of residual water in the variable chamber that is sucked into the water passage chamber to adjust the vacuum degree of the water passage chamber after the water is turned off.

[0010] In a preferred embodiment, the adjusting member is used to adjust the position of the valve body along the movement direction of the valve core.

[0011] In a preferred embodiment: the valve body is arranged in the mounting hole of the fixing seat to form the water flow chamber, and the adjusting member is a thread arranged on the side wall of the valve body and the inner wall of the mounting hole; the valve body is provided with a water inlet for connecting the water flow chamber and the water flow channel; when the water is turned off, the valve core is located in a first position so that the sealing member on the valve core disconnects the connection between the water inlet and the water flow chamber, and when the water is passed, the valve core is located in a second position so that the sealing member on the valve core opens the connection between the water inlet and the water flow chamber.

[0012] In a preferred embodiment: the switch valve also includes an operating member, which is used to drive the valve body to move relative to the mounting hole to adjust the height difference between the sealing member on the valve core and the connection point between the water inlet and the water flow chamber when the valve core is in the second position.

[0013] In a preferred embodiment, the switch valve further includes a first reset member, and when water flows, the valve core squeezes the first reset member to accumulate elastic reset force.

[0014] In a preferred embodiment: it also includes a cover, the water outlet is provided on the cover, and a plurality of first ribs are provided on the side of the cover facing the water outlet channel. The plurality of first ribs and the fixing seat enclose a plurality of independent areas, each of which is set as a water flow cavity, and each water flow cavity is correspondingly provided with a switch valve.

[0015] The present invention provides a top spray shower head, comprising a top spray shower head body and the above-mentioned structure for stopping the shower head when water is turned off.

[0016] In a preferred embodiment: an installation cavity is provided in the top spray shower body, and a piston is placed in the installation cavity to divide the installation cavity into the variable chamber and a chamber connected to the outside atmosphere; when water is passed through, the variable chamber forms a negative pressure so that the piston moves under the action of the outside atmosphere to reduce the volume of the variable chamber and squeeze the second reset member to accumulate elastic reset force.

[0017] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0018] 1. The present invention provides a water-stop mechanism that shuts off water. A water passage chamber is located at the junction between the water passage and the water outlet. The chamber opens when water is flowing and closes when the water is shut off. Since the chamber closes by resetting the on-off valve, the valve core of the on-off valve must travel a certain reset stroke after shutting off the water. During this reset stroke, residual water in the chamber is drawn away by a variable chamber, creating a negative pressure in the chamber. By designing different reset strokes, the amount of water drawn away from the chamber can be varied, resulting in chambers with varying degrees of vacuum. After shutting off the water, the vacuum in the chamber allows atmospheric pressure to seal any remaining water within it, achieving the water-stop effect. Because the vacuum can be adjusted, showerheads with varying diameters, areas, or swing angles can each meet their specific water-stop requirements by designing different reset strokes, thereby achieving modular water-stop functionality.

[0019] 2. The present invention provides a structure that stops the water flow immediately after turning it off. The reset stroke of the valve core can be adjusted after leaving the factory. For example, when the user is away from home for a long time and does not need to use the shower head, the reset stroke of the valve core can be adjusted to the shortest. In this way, the amount of residual water sucked away by the variable chamber can be ignored, the vacuum degree of the water flow chamber is very low, and the residual water in the water flow chamber will not accumulate in the water flow chamber, thereby preventing the residual water from staying in the water flow chamber for a long time and breeding bacteria.

[0020] 3. The present invention provides a structure that stops the flow of water when it is turned off. When the water is turned on, the water flow is accelerated through the accelerating flow channel with a smaller cross-sectional area. According to the Bernoulli equation, the pressure energy is reduced, thereby generating a negative pressure on the variable cross-sectional flow channel. The through hole on the variable cross-sectional flow channel is connected to the variable chamber, thereby sucking away the air in the variable chamber, so that the piston overcomes the spring force and moves inward under the action of the external atmospheric pressure.

[0021] When the water is turned off, the negative pressure at the through-hole disappears (restoring to a state close to atmospheric pressure). The piston, under the action of the spring force and the close atmospheric pressure, overcomes the external atmospheric pressure and moves outward. At this time, the air in the variable chamber generates negative pressure due to the increase in the volume of the variable chamber, which draws the residual water in the water passage into the variable chamber through the through-hole. This achieves the effect of quickly stopping the water. And because the variable chamber is independently arranged outside the water passage, the reduction in the volume of the variable chamber during water flow does not depend on the water pressure acting on the variable chamber. As a result, water can be discharged smoothly even when the water pressure is relatively low. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] FIG1 is a perspective view of the appearance of a shower head in a preferred embodiment of the present invention;

[0023] FIG2 is a perspective exploded view of the structure of a shower head in a preferred embodiment of the present invention;

[0024] FIG3 is a cross-sectional view of a shower head in a water-flowing state according to a preferred embodiment of the present invention;

[0025] FIG4 is a cross-sectional view of a shower head in a water-off state according to a preferred embodiment of the present invention;

[0026] FIG5 is a front view of the cover in a preferred embodiment of the present invention;

[0027] FIG6 is a schematic diagram of gravity and adsorption force in a tilted shower head according to a preferred embodiment of the present invention;

[0028] FIG7 is a partial enlarged view of the cover in a preferred embodiment of the present invention;

[0029] FIG8 is a partial enlarged view of FIG4 . DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0031] In the description of the present invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installed", "provided with", "set / connected", "connected", etc. should be understood in a broad sense. For example, "connection" can be a wall-mounted connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be a direct connection or an indirect connection through an intermediate medium. It can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] 1 to 4 , this embodiment provides a top-spray shower head, comprising a top-spray shower head body 1 and a structure for stopping water flow upon turning off the water. The structure for stopping water flow upon turning off the water flow is used to completely stop the top-spray shower head from dripping after the water flow is turned off.

[0034] In this embodiment, the overhead showerhead body 1 includes a decorative cover 11, a face cover 12, and a rear shell 13. The face cover 12 and rear shell 13 are assembled, with the decorative cover 11 positioned on the side of the face cover 12 facing away from the rear shell 13. A connecting seat 14 is disposed within the overhead showerhead body 1, and an opening is provided in the rear shell 13 to partially expose the connecting seat 14. This portion of the connecting seat 14, which is exposed outside the rear shell 13, is pivotally connected to the ball head 2.

[0035] In order to achieve the above-mentioned water-stopping effect, the water-stopping structure includes: a water flow chamber 31, a variable chamber 32, a water flow channel 33, and a switch valve 34; the water flow chamber 31 is arranged between the water outlet 121 of the face cover 12 and the water flow channel 33; the water flow channel 33 is used to introduce municipal water into the top spray shower body 1 through the ball head 2 and the connecting seat 14, and then divert it to each water flow chamber 31 through the water diversion body 15 in the top spray shower body 1, and then through the water outlet 121 connected to each water flow chamber 31, the normal water outlet of the top spray shower can be achieved.

[0036] To achieve the instantaneous stop effect when the water is turned off, the variable chamber 32 is designed to decrease in volume when water is flowing and increase in volume when the water is turned off. This creates suction when the water is turned off, drawing residual water from the water passage chamber 31 into the variable chamber 32. Furthermore, the on-off valve 34, under the action of water pressure, connects the water passage chamber 31 with the water passage 33 when water is flowing. The on-off valve 34 resets when the water is turned off, disconnecting the connection between the water passage chamber 31 and the water passage 33. Because the variable chamber 32 generates negative pressure when water is flowing, causing the variable chamber to decrease in volume, the negative pressure disappears when the water is turned off, allowing the variable chamber to increase in volume. During this process of volume expansion, a certain amount of air within the variable chamber regenerates negative pressure due to the increased volume. Consequently, when the water is turned off, residual water from the water passage chamber 31 is drawn into the variable chamber 32 through the water passage 33. After the valve core 341 of the on-off valve 34 disconnects the water passage 33 from the water passage chamber 31, negative pressure is generated within the water passage chamber 31.

[0037] Therefore, when the switch valve 34 is reset when the water is turned off and the connection between the water chamber 31 and the water flow channel 33 is disconnected, the variable chamber 32 will no longer be able to absorb residual water from the water chamber 31. Therefore, as long as the reset stroke of the valve core 341 of the switch valve 34 is controlled, the water absorption amount of the variable chamber 32 can be changed, thereby changing the vacuum degree of the negative pressure chamber formed by the water chamber 31 after the water is turned off.

[0038] As can be seen from the above description, to satisfy the above process, the water absorption time of the variable chamber 32 must be greater than the reset time of the valve core 341. Otherwise, if the valve core 341 is still in the process of resetting while the variable chamber 32 has already completed water absorption, no matter how much the reset stroke of the valve core 341 is adjusted, the water absorption amount of the variable chamber 32 will not change. Therefore, the stroke of the variable chamber 32 expanding when the water is turned off is S1, and the stroke of the valve core 341 of the on-off valve 34 returning when the water is turned off is S2. It is necessary to satisfy S1>S2.

[0039] The aforementioned structure that stops water flow when the water is turned off has an additional water passage chamber 31 provided at the connection point between the water passage channel 33 and the water outlet 121. The water passage chamber 31 is open when water is flowing and closed when the water is turned off. Since the closure of the water passage chamber 31 is achieved by resetting the on-off valve 34, the valve core 341 of the on-off valve 34 needs to go through a certain reset stroke after the water is turned off before the water passage chamber 31 can be closed. During this reset stroke, the residual water in the water passage chamber 31 will be sucked away by the variable chamber 32, thereby forming a negative pressure in the water passage chamber 31. By designing different reset strokes, the amount of water sucked away from the water passage chamber 31 can be varied, thereby forming water passage chambers 31 with different degrees of vacuum. After the water is turned off, since the water passage chamber 31 has a vacuum degree, the external atmospheric pressure can seal the residual water in the water passage chamber 31 in the water passage chamber 31, thereby achieving the effect of stopping water flow when the water is turned off. Since the vacuum degree can be adjusted, different reset strokes can be designed to meet the requirements of different shower heads for shutting off the water and stopping the shower head, thereby realizing the modular shut-off and stopping requirements.

[0040] In this embodiment, the water flow channel 33 includes an acceleration flow channel 331 whose cross-section becomes smaller along the water flow direction. The connection point between the water flow channel 33 and the variable chamber 32 is located downstream of the acceleration flow channel 331 along the water flow direction, and the connection point is specifically a through hole 332.

[0041] In order to form the above-mentioned variable chamber 32, the left and right sides of the connecting seat 14 are respectively connected to a piston seat 321, an installation cavity is formed in the piston seat 321, and a piston 322 is placed in the installation cavity to divide the installation cavity into the variable chamber 32 and a chamber connected to the outside atmosphere.

[0042] When water flows, after the water flow is accelerated through the acceleration channel 331, according to the Bernoulli equation, the pressure can be reduced, so a negative pressure is generated on the through hole 332 on the variable cross-section channel. The through hole 332 on the variable cross-section channel is connected to the variable chamber 32, thereby sucking away the air in the variable chamber 32 so that a negative pressure is formed in the variable chamber 32, and further the piston 322 overcomes the elastic reset force of the second reset member 323 under the action of the external atmospheric pressure and moves inward, so that the volume of the variable chamber 32 becomes smaller.

[0043] When the water is turned off, the negative pressure at the through hole 332 disappears (restoring to a state close to atmospheric pressure), and the piston 322 moves outward under the elastic restoring force of the second restoring member 323 and the action of the close atmospheric pressure, overcoming the external atmospheric pressure. At this time, the air in the variable chamber 32 generates negative pressure due to the increase in the volume of the variable chamber 32, and the residual water in the water flow chamber 31 is sucked into the variable chamber 32 through the through hole 332. This achieves the effect of quickly stopping the water. In addition, because the variable chamber 32 is independently arranged outside the water flow channel 33, the reduction in the volume of the variable chamber 32 during water flow does not depend on the water pressure acting on the variable chamber 32. In this way, water can be discharged smoothly even when the water pressure is relatively low during water flow.

[0044] In this embodiment, the on-off valve 34 further includes an adjusting member 346 for adjusting the position of the valve body 342 along the direction of movement of the valve core 341, thereby adjusting the return stroke of the valve core 341 when the water is turned off, thereby changing the volume of residual water drawn into the variable chamber 32 by the water passage chamber 31, thereby adjusting the vacuum level of the water passage chamber 31 after the water is turned off. In this way, the return stroke of the valve core 341 can be adjusted even after leaving the factory via the adjusting member 346. For example, when a user is away from home for an extended period and does not need to use the showerhead, the return stroke of the valve core 341 can be adjusted to the minimum. This minimizes the amount of residual water drawn into the variable chamber 32, reduces the vacuum level of the water passage chamber 31, and prevents residual water from accumulating in the water passage chamber 31, thereby preventing the residual water from lingering in the water passage chamber 31 for a long period and breeding bacteria.

[0045] To achieve adjustment, in this embodiment, the fixed seat 343 and the face cover 12 form the water flow chamber 31, the fixed seat 343 is provided with a mounting hole, and the valve core 341 is movably arranged in the mounting hole; the adjusting member 346 is a thread arranged on the side wall of the valve body 342 and the inner wall of the mounting hole; in this way, the valve body 342 can be moved up and down along the axial direction in the fixed seat 343. The valve body 342 is provided with a water inlet 3421 and a sealing mating surface 3422. The water inlet 3421 is provided on the side of the valve body 342, and is used to connect the water cavity 31 and the water flow channel 33. The sealing mating surface 3422 is provided downstream of the water inlet 3421 along the water flow direction; when the water is turned off, the valve core 341 is located in the first position so that the sealing part 3411 on the valve core 341 is pressed against the sealing mating surface 3422, and the connection between the water inlet 3421 and the water flow cavity 31 is disconnected; when the water is passed, the valve core 341 is located in the second position so that the sealing part 3411 on the valve core 341 is away from the sealing mating surface 3422, and the connection between the water inlet 3421 and the water flow cavity 31 is opened.

[0046] To further facilitate user adjustment of the position of the valve body 342, the on-off valve 34 also includes an operating member 345. The operating member 345 is used to drive the valve body 342 relative to the mounting hole to adjust the height difference between the sealing member 3411 on the valve core 341 and the sealing mating surface 3422 when the valve core 341 is in the second position. This height difference determines the travel required for the valve core 341 to move from the second position to the first position. In this embodiment, the operating member 345 is a slot or a cross slot provided on the end surface of the valve body 342 along one axial direction, which facilitates the user to rotate the valve body 342 with a screwdriver, thereby driving the valve body 342 to move up and down along the axial direction.

[0047] In order to allow the valve core 341 to automatically reset when the water is turned off, the switch valve 34 further includes a first reset member. When the water is turned on, the valve core 341 squeezes the first reset member 344 to accumulate elastic reset force.

[0048] In this embodiment, the first return member 344 and the second return member 323 are respectively return springs. Furthermore, since there are numerous water outlets 121 on the shower head, it is impractical and unnecessary to provide a water passage cavity 31 for each water outlet 121. Therefore, the water outlets 121 can be divided into multiple areas, each with a water passage cavity 31. Each water passage cavity corresponds to an on-off valve 34, and the water passage cavity 31 can be connected to all the water outlets 121 in the area.

[0049] With further reference to Figures 5 and 6, when the overhead showerhead is tilted, the residual water within the showerhead body 1 tends to collect in the lower area, resulting in a larger amount of residual water in this lower area. Consequently, the residual water in this lower area is also subject to a greater gravitational force. If the gravitational force on the residual water in this lower area exceeds the surface adsorption force between the water and the water outlet 21, the water cannot be turned off and stopped immediately. Therefore, to address this issue, either the surface adsorption force between the water outlet 21 and the residual water is increased, or the amount of residual water that can collect in this lower area is reduced.

[0050] In this embodiment, the inner side of the cover 12, i.e., the side facing the water outlet, has a bottom surface on which a first rib 122 and a second rib 123 are protruding. The first rib 122 and the fixing seat 343 enclose multiple independent areas, each of which is configured as a water passage cavity 31. This prevents residual water in different areas from converging. For example, in the case of Figure 6, only the residual water at a height of 1 / 3H will converge to the lower area due to the tilt. If the areas were separated, all the residual water would converge to the lower area. This greatly reduces the amount of residual water in the lower area, thereby reducing the gravity acting on the residual water in the lower area, thereby ensuring that the gravity of the residual water in the lower area does not exceed the surface adsorption force between the water outlet 21 and the residual water, allowing the water-off and stop function to be implemented normally when the overhead shower is tilted.

[0051] With further reference to FIG. 7 , the second rib 123 is used to form a flow channel, which can increase the adsorption force between the water and the second rib 123 , thereby preventing the water from flowing easily after the water is turned off, thereby ensuring the sealing of the water outlet 121 .

[0052] In addition, in Figure 8, there is a height difference H' between the face cover 12 and the fixing seat 343, and there is a gap S between the upper end surface of the water outlet 121 and the fixing seat. The water outlet 121 is set to be a long strip, and the aspect ratio of the water outlet 121 is increased. This is to increase the pipe resistance so that the residual water is not easy to flow after the water is turned off.

[0053] The above is only a preferred specific embodiment of the present invention, but the design concept of the present invention is not limited to this. Any technician familiar with this technical field who uses this concept to make non-substantial changes to the present invention within the technical scope disclosed by the present invention shall be deemed to infringe the scope of protection of the present invention. Industrial Applicability

[0054] The present invention provides a structure that stops the water flow as soon as it is turned off. A water passage chamber is additionally provided at the connection point between the water passage and the water outlet. The water passage chamber is opened when water is flowing and is closed when the water is turned off. By designing different reset strokes, the amount of water sucked out of the water passage chamber can be different, thereby forming water passage chambers with different vacuum degrees. After the water is turned off, since the water passage chamber has a vacuum degree, the external atmospheric pressure can seal the remaining residual water in the water passage chamber in the water passage chamber, thereby achieving the effect of stopping the water flow as soon as it is turned off. Since the vacuum degree can be adjusted, the present invention can meet the requirements of different shower heads with different diameters, different areas or different swing angles for stopping the water flow as soon as they are turned off by designing different reset strokes, thereby achieving the requirement of modular stopping the water flow as soon as they are turned off. The present invention has a wide range of applications and good industrial applicability.

Claims

1. A structure that stops water immediately after turning it off, characterized in that include: A water passage cavity, a variable chamber, a water passage, a water outlet and a switch valve; the water passage cavity is arranged between the water outlet and the water passage; When water is flowing, the switch valve is acted upon by water pressure to connect the water flow chamber with the water flow channel; when the water is turned off, the switch valve is reset to disconnect the connection between the water flow chamber and the water flow channel; when water is flowing, the variable chamber generates negative pressure to reduce the volume of the variable chamber, and when the water is turned off, the negative pressure disappears and the volume of the variable chamber increases, so that the residual water in the water flow chamber is sucked into the variable chamber through the water flow channel when the water is turned off, and after the valve core of the switch valve disconnects the connection between the water outlet chamber and the water flow chamber, negative pressure is formed in the water flow chamber.

2. The water-off stop structure according to claim 1, characterized in that: The stroke of the variable chamber increasing in volume when the water is turned off is S1, and the stroke of the valve core of the switch valve returning to its original position when the water is turned off is S2, wherein S1>S2.

3. The water-off stop structure according to claim 1, characterized in that: The water flow channel includes an accelerating flow channel with a cross section that becomes smaller along the water flow direction. The connection point between the water flow channel and the variable chamber is located downstream of the accelerating flow channel along the water flow direction.

4. The water-off stop structure according to claim 1, characterized in that: The switch valve also includes an adjusting member, which is used to adjust the stroke of the valve core returning to its original position when the water is turned off, thereby changing the volume of residual water in the variable chamber that is sucked into the water passage chamber to adjust the vacuum degree of the water passage chamber after the water is turned off.

5. The water-off-stop structure according to claim 4, characterized in that: The adjusting member is used to adjust the position of the valve body along the movement direction of the valve core.

6. The water-off-stop structure according to claim 5, characterized in that: The valve body is provided with a water inlet for connecting the water cavity and the water flow channel; when the water is turned off, the valve core is located in a first position so that the sealing member on the valve core disconnects the connection between the water inlet and the water cavity; when the water is turned on, the valve core is located in a second position so that the sealing member on the valve core opens the connection between the water inlet and the water cavity.

7. The water-off-stop structure according to claim 6, characterized in that: The valve core is provided with a sealing mating surface, and the switch valve also includes an operating member, which is used to drive the valve body to move relative to the mounting hole to adjust the height difference between the sealing member on the valve core and the sealing mating surface when the valve core is in the second position.

8. The water-off stop structure according to claim 1, characterized in that: The switch valve further includes a first reset component. When water flows, the valve core squeezes the first reset component to accumulate elastic reset force.

9. The water-off stop structure according to claim 1, characterized in that: It also includes a cover and a fixing seat, the cover is provided with the water outlet, and a plurality of first ribs are provided on the side of the cover facing the water outlet channel. The plurality of first ribs and the fixing seat are enclosed to form a plurality of independent areas, each of which is set as a water flow cavity, and each water flow cavity is correspondingly provided with a switch valve.

10. A top spray shower, characterized in that The invention comprises a top spray shower body and a water-stopping structure as described in any one of claims 1 to 9.

11. The overhead shower head according to claim 10, characterized in that: An installation cavity is provided in the top spray shower body, and a piston is placed in the installation cavity to divide the installation cavity into the variable chamber and a chamber connected to the outside atmosphere; when water is passed, the variable chamber forms a negative pressure so that the piston moves under the action of the outside atmosphere to reduce the volume of the variable chamber and squeeze the second reset member to accumulate elastic reset force.

12. The overhead shower head according to claim 10 or 11, characterized in that: The water outlet is provided on the top spray shower head cover, and a plurality of first ribs and second ribs are provided on the side of the cover facing the water outlet flow channel. The plurality of first ribs and the fixing seat enclose a plurality of independent areas, each of which is set as a water flow cavity, and each water flow cavity is correspondingly provided with a switch valve; the second rib is used to form a flow channel to increase the adsorption force between water and the second rib.

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