Water-saving shower device

Abstract

The utility model provides a water-saving shower device which comprises a shell, a water inlet pipe, a water outlet pipe, a water outlet control mechanism, a water inlet pipe, a water outlet control mechanism, a water outlet control mechanism and a water outlet control mechanism, and the interior of the shell is divided into a pipe cavity and a water collecting cavity; the drainage structure comprises a drainage pipeline communicated with the water inlet pipeline and the water collecting cavity, and a drainage control mechanism used for controlling the water inlet pipeline to drain water to the water collecting cavity through the drainage pipeline; the water return structure comprises a water return pipeline communicated with the water inlet pipeline and the water collecting cavity, and a water return control mechanism used for controlling the water inlet pipeline to return water to the water inlet pipeline through the water return pipeline. Cooling water can be controlled by the drainage control mechanism to be pre-drained into the water collection cavity for storage through the drainage pipeline, and then the cooling water stored in the water collection cavity is controlled by the water return control mechanism to return to the water inlet pipeline through the water return pipeline, so that warm water is discharged from the water outlet device during showering, the user experience is improved, and excessive waste of water resources is avoided; and water is saved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a shower device field, specifically point to a kind of water-saving shower device. BACKGROUND

[0002] Shower device is used to be installed on bathroom wall as the connecting bridge between water heater and shower, top spray and other water outlet device, usually shower device is also connected with shower pole fixed on wall, to install top spray and shower and other water outlet device.

[0003] For the existing multi-room bathroom, there is often a long distance between the water heater and the shower device, which needs to be connected through a long conveying pipeline. This leads to the fact that after using hot water shower through the water outlet device, a certain amount of cooling water formed by the cooling of hot water will remain in the long conveying pipeline. When the valve of the corresponding water outlet device of the shower device is opened for the next shower, the hot water can only reach the cooling device to mix with cold water to form warm water with suitable temperature for showering after waiting for the cooling water in the long conveying pipeline to be completely discharged. This makes the temperature in the bathroom decrease while waiting for the cooling water to be discharged, greatly reducing the user experience, and causing a large amount of waste of water resources.

[0004] To solve the above problems of the prior art, the utility model provides a water-saving shower device. UTILITY MODEL CONTENT

[0005] To solve the above problems of the prior art, the utility model provides a water-saving shower device.

[0006] The technical scheme of the utility model is:

[0007] A water-saving shower device, comprising:

[0008] A housing is divided into a pipe cavity and a water collecting cavity, the side wall of the pipe cavity is provided with a water inlet pipeline, and the water inlet pipeline is connected with a shower pipeline through a water outlet control mechanism;

[0009] A drainage structure, comprising a drainage pipeline communicating with the water inlet pipeline and the water collecting cavity, and a drainage control mechanism for controlling the water inlet pipeline to drain through the drainage pipeline to the water collecting cavity;

[0010] A backwater structure, comprising a backwater pipeline communicating with the water inlet pipeline and the water collecting cavity, and a backwater control mechanism for controlling the water inlet pipeline to backwater through the backwater pipeline to the water inlet pipeline.

[0011] Further, the drainage control mechanism comprises a temperature sensing device for detecting the water temperature in the water inlet pipeline, a drainage electric control valve for controlling the on-off between the water inlet pipeline and the drainage pipeline, and a water level detection device for detecting the water level in the water collecting cavity.

[0012] Further, the backwater control mechanism comprises a water flow sensor for detecting the water flow in the water inlet pipe, and a backwater electric valve for controlling the opening and closing of the water inlet pipe and the backwater pipe.

[0013] Further, the tube cavity and the water collecting cavity are arranged in an up-down manner, the lower end of the backwater pipe extends downward to the bottom of the water collecting cavity, and the water inlet pipe is provided with a siphon passage through the upper port of the backwater pipe; when the water inlet pipe is filled with water and the water flows through the siphon passage, the backwater pipe sucks the cooling water in the water collecting cavity upward to the water inlet pipe.

[0014] Further, the inner diameter of the siphon passage corresponding to the upper port of the backwater pipe is smaller than the inner diameter of the water inlet pipe, and the inner diameter of the siphon passage gradually increases along the water inlet direction of the water inlet pipe.

[0015] Further, the lower end of the backwater pipe extends laterally to form a water inlet end, and the backwater control mechanism comprises a one-way valve arranged in the upper end of the backwater pipe and corresponding to the siphon passage.

[0016] Further, the backwater control mechanism further comprises a backwater float ball valve, which comprises a first float ball hinged to the backwater pipe through a first connecting rod and a first plug connected to the bottom of the first connecting rod and arranged in the water inlet end; when the water level in the water collecting cavity rises, the first float ball rises and drives the first plug to rotate upward to separate from the water inlet end; when the water level in the water collecting cavity drops, the first float ball drops and drives the first plug to reset to block the water inlet end.

[0017] Further, the tube cavity and the water collecting cavity are arranged in an up-down manner, the lower end of the backwater pipe extends laterally to form a water inlet end, and the backwater control mechanism comprises a one-way valve arranged in the upper end of the backwater pipe and corresponding to the siphon passage.

[0018] Further, the water inlet pipe comprises a hot water pipe and a cold water pipe, the drain pipe is connected to the hot water pipe and the water collecting cavity, the backwater pipe is connected to the cold water pipe and the water collecting cavity, and the water outlet control mechanism is a mixing valve connected to the hot water pipe, the cold water pipe and the shower pipe.

[0019] Further, the water inlet pipeline comprises a warm water pipeline, the warm water pipeline, the water drainage pipeline, the water collecting cavity and the water return pipeline are sequentially connected in circulation, and the water outlet control mechanism is a water outlet control valve for controlling the on-off between the warm water pipeline and the shower pipeline.

[0020] Therefore, the utility model provides following effects and / or advantages:

[0021] 1、Through the increase of water collecting cavity, drainage structure and water return structure, when the user needs to take a shower, the cooling water in the long conveying pipeline between the water heater and the shower device water inlet pipeline can be controlled by the drainage control mechanism to be pre-discharged into the water collecting cavity for storage, and then the stored cooling water in the water collecting cavity is controlled by the water return control mechanism to return to the water inlet pipeline through the water return pipeline, mixed with the water in the long conveying pipeline to a corresponding temperature, and then sent out to the corresponding water outlet device through the shower pipeline to supply water for the user to take a shower, so that the water outlet device can output warm water when taking a shower, the waiting time of the user is shortened, the room temperature is prevented from being lowered due to the output of cooling water, the user experience is improved, the cooling water is recycled, and water resources are prevented from being wasted excessively.

[0022] 2、By arranging the water collecting cavity below, the cooling water can automatically fall under the action of gravity when being discharged, and by arranging the siphon channel, when the cooling water needs to be returned, the water return pipeline does not need to be provided with a water pump, and the cooling water in the water collecting cavity can be sucked into the cooling pipeline through the siphon effect, the convenience of the water drainage pipeline and the water return pipeline is improved, and the cost and noise of the shower device can be reduced by avoiding the arrangement of the water pump.

[0023] 3、In order to improve the stability of the siphon channel to the siphon effect of the water return pipeline, the inner diameter of the siphon channel corresponding to the upper port of the water return pipeline is smaller than the inner diameter of the water inlet pipeline, specifically smaller than the inner diameter of the cold water pipeline, so as to improve the water pressure strength of the water flow of the cold water pipeline when flowing into the upper port of the water return pipeline through the siphon channel, and improve the stability of the siphon effect, the inner diameter of the siphon channel gradually increases along the water inlet direction of the water inlet pipeline, so that the water pressure gradually decreases in the direction from the upper port of the water return pipeline to the water outlet control mechanism, so as to improve the tendency of the cooling water sucked by the water return pipeline to be output to the water outlet control mechanism after entering the siphon channel, and further improve the stability of the siphon effect.

[0024] 4. The shower device is characterized in that the water outlet electric control valve is replaced by a one-way valve, the water return float ball valve is arranged, the water inlet end of the water return pipeline is mechanically controlled to automatically open and close with the water level change in the water collecting cavity, and the water inlet end is blocked by the first sealing plug when the water level in the water collecting cavity drops to the low position, so that the air pressure in the water return pipeline is ensured, and the water level in the water collecting cavity is low, the water return pipeline is empty, and the water inlet pipeline makes the siphon pipeline and the water return pipeline produce a siphon effect, so that the air in the siphon water return pipeline causes abnormal noise, and the first sealing plug is automatically separated from the water inlet end when the water level in the water collecting cavity rises to a certain height, so that the water inlet end is opened, and the water return pipeline is filled with water; so as to ensure that the siphon effect is successfully carried out when the water level in the water collecting cavity rises to the water return pipeline, and the second sealing plug is used to block the water inlet end when the water level in the water collecting cavity drops to the water return pipeline, so as to avoid the siphon air from producing abnormal noise, and improve the stability of the shower device during use.

[0025] 5. The shower device is characterized in that the water outlet electric control valve is replaced by a mechanical button and a mechanical control valve, and the water level detection device is replaced by a water outlet float ball valve, so that the cooling water discharge of the water outlet pipeline and the cooling water return of the water return pipeline are both mechanically controlled, so that the control of the shower device is replaced by a physical button control, which is suitable for old users, and the applicability of the shower device is improved.

[0026] It should be understood that the above summary and the following detailed description of the present application are exemplary and explanatory, and are intended to provide further explanation of the application as claimed. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the first embodiment.

[0028] Figure 2 It is a sectional view structural schematic diagram of the first embodiment after removing the shell top cover.

[0029] Figure 3 It is a sectional view structural schematic diagram of the first embodiment.

[0030] Figure 4 It is a sectional view structural schematic diagram of the second embodiment after removing the shell top cover. Figure 3

[0031] Figure 5 It is a sectional view structural schematic diagram of the second embodiment after removing the shell top cover.

[0032] Figure 6 It is a sectional view structural schematic diagram of the second embodiment after removing the shell top cover.

[0033] Figure 7 It is a sectional view structural schematic diagram of the third embodiment after removing the shell top cover.

[0034] ​Figure 8 A sectional structure schematic diagram of the embodiment three. DETAILED DESCRIPTION

[0035] In order to facilitate the understanding of those skilled in the art, the structure of the utility model will be further described in detail in combination with the drawings:

[0036] Embodiment one

[0037] Reference Figures 1-4 A water-saving shower device, comprising:

[0038] A shell 1 is internally partitioned into a pipe cavity 12 and a water collecting cavity 11, a water inlet pipeline 2 is provided through the side wall of the pipe cavity 12, and a shower pipeline 7 is connected to the water inlet pipeline 2 through a water outlet control mechanism 8; specifically, the pipe cavity 12 and the water collecting cavity 11 are arranged in an up-down distribution, and the water inlet pipeline 2 is connected to the water outlet end 31 of a water heater through a long conveying pipeline;

[0039] A drainage structure, comprising a drainage pipeline 3 communicating the water inlet pipeline 2 and the water collecting cavity 11, and a drainage control mechanism 4 for controlling the water inlet pipeline 2 to drain to the water collecting cavity 11 through the drainage pipeline 3;

[0040] A backwater structure, comprising a backwater pipeline 5 communicating the water inlet pipeline 2 and the water collecting cavity 11, and a backwater control mechanism 6 for controlling the water inlet pipeline 2 to backwater to the water inlet pipeline 2 through the backwater pipeline 5. Specifically, the water inlet pipeline 2 comprises a hot water pipeline 22 and a cold water pipeline 23, the drainage pipeline 3 communicates the hot water pipeline 22 and the water collecting cavity 11, the backwater pipeline 5 communicates the cold water pipeline 23 and the water collecting cavity 11, and the water outlet control mechanism 8 is a water mixing valve connected to the hot water pipeline 22, the cold water pipeline 23 and the shower pipeline 7.

[0041] The above structure is provided, and the water collecting cavity 11, the drainage structure and the backwater structure are additionally provided, so that when a user needs to take a shower, in the case that there is cooling water in the long conveying pipeline between the water heater and the water inlet pipeline 2 of the shower device, the cooling water can be controlled by the drainage control mechanism 4 to be pre-drained into the water collecting cavity 11 for storage through the drainage pipeline 3, and then the cooling water stored in the water collecting cavity 11 can be controlled by the backwater control mechanism 6 to backwater to the water inlet pipeline 2 through the backwater pipeline 5, mixed with the water sent by the long conveying pipeline to a corresponding temperature, and then sent out to the corresponding water outlet device through the shower pipeline 7 for a user to take a shower, so as to ensure that the water outlet device outputs warm water when taking a shower, shorten the waiting time of the user, avoid the output of cooling water to the bathroom to cause the room temperature to drop, improve the user experience, and recycle the cooling water, thereby avoiding excessive waste of water resources.

[0042] In order to improve the intelligent control effect of the shower device, the drainage control mechanism 4 comprises a temperature sensing device 41 for detecting the water temperature in the water inlet pipeline 2, a drainage electric control valve 42 for controlling the on-off between the water inlet pipeline 2 and the drainage pipeline 3, and a water level detection device 43 for detecting the water level in the water collecting cavity 11; the backwater control mechanism 6 comprises a water flow sensing device 61 for detecting the water flow in the water inlet pipeline 2, and a backwater electric control valve 62 for controlling the on-off between the water inlet pipeline 2 and the backwater pipeline 5; specifically, the drainage electric control valve 42 and the backwater electric control valve 62 are both electromagnetic valves and are respectively arranged on the hot water pipeline 22 and the cold water pipeline 23; the temperature sensing device 41 is a temperature sensor arranged in the hot water pipeline 22; the water level detection device 43 is a water level sensor arranged in the water collecting cavity 11 in an up-down sliding manner; the water flow sensing device 61 is a water flow sensor sleeved on the cold water pipeline 23; and the controller for electrically connecting the drainage electric control valve 42, the backwater electric control valve 62, the temperature sensing device 41 and the water level detection device 43 is arranged in the cavity 12.

[0043] Pre-drainage before showering: when the temperature sensing device 41 detects that the water temperature in the hot water pipeline 22 decreases to a set value, the drainage electric control valve 42 is opened, and the cooling water in the long conveying pipeline is discharged into the water collecting cavity 11 through the hot water pipeline 22 and the drainage pipeline 3 for storage, until the temperature sensing device 41 detects that the water temperature in the hot water pipeline 22 reaches 35℃ or the water level detection device 43 detects that the water level in the water collecting cavity 11 reaches the highest water level, the drainage electric control valve 42 is closed, and the drainage pipeline 3 stops draining.

[0044] Cooling water backflow and reuse when starting showering: when the water flow sensing device 61 in the cold water pipeline 23 senses water flow, the controller judges that the shower device is opened, controls the backwater electric control valve 62 to open, and returns the cooling water in the water collecting cavity 11 to the cold water pipeline 23 to mix with the cold water, then inputs the mixed water valve to mix with the hot water to form warm water, and then outputs the water through the shower pipeline 7 and the water outlet device.

[0045] In order to improve the convenience of the water drainage pipeline 3 and the water return pipeline 5, the pipe cavity 12 and the water collecting cavity 11 are arranged in an up-down manner, the lower end of the water return pipeline 5 extends downward to the bottom of the water collecting cavity 11, and the water inlet pipeline 2 is provided with a siphon passage 21 through which water flows to the upper end of the water return pipeline 5. When the water inlet pipeline 2 is filled with water and the water flows through the siphon passage 21, the water return pipeline 5 sucks the cooling water in the water collecting cavity 11 upward to the water inlet pipeline 2. Specifically, the siphon passage 21 is arranged in the cold water pipeline 23, and the water return pipeline 5 sucks the cooling water in the water collecting cavity 11 upward to the cold water pipeline 23. Thus, by arranging the water collecting cavity 11 at the lower side, the cooling water can automatically fall under the action of gravity when being discharged, and by additionally arranging the siphon passage 21, when the cooling water needs to be returned, the water return pipeline 5 can suck the cooling water in the water collecting cavity 11 into the cooling pipeline through the siphon effect without the need of a water pump, thereby improving the convenience of the water drainage pipeline 3 and the water return pipeline 5, and avoiding the arrangement of the water pump, which can reduce the cost and noise of the shower device.

[0046] In order to improve the stability of the siphon effect of the siphon passage 21 on the water return pipeline 5, the inner diameter of the siphon passage 21 corresponding to the upper end of the water return pipeline 5 is smaller than the inner diameter of the water inlet pipeline 2, specifically smaller than the inner diameter of the cold water pipeline 23, thereby improving the water pressure strength formed when the water flow in the cold water pipeline 23 flows into the upper end of the water return pipeline 5 through the siphon passage 21, so as to improve the stability of the siphon effect. The inner diameter of the siphon passage 21 gradually increases along the water inlet direction of the water inlet pipeline 2, so that the water pressure gradually decreases from the upper end of the water return pipeline 5 to the water outlet control mechanism 8, thereby improving the tendency of the cooling water sucked by the water return pipeline 5 to be output to the water outlet control mechanism 8 after entering the siphon passage 21, so as to further improve the stability of the siphon effect.

[0047] Embodiment Two

[0048] Reference Figures 5-6 In order to meet different user needs, the control of the water return control mechanism 6 is replaced by pure mechanical control to reduce the overall cost of the shower device. The difference between this embodiment and the first embodiment is that:

[0049] The lower end of the water return pipeline 5 extends laterally to form a water inlet end 51, and the water return control mechanism 6 includes a one-way valve 63 arranged in the upper end of the water return pipeline 5 and corresponding to the siphon passage 21 on the water outlet side. Thus, by replacing the water drainage electric control valve 42 with the one-way valve 63, the cold water in the cold water pipeline 23 can be prevented from entering the water collecting cavity 11 while ensuring that the siphon effect of the siphon passage 21 on the water return pipeline 5 can be achieved under the premise of reducing the cost of the electric control of the shower device.

[0050] In order to improve the stability of the shower device during use, the backwater control mechanism 6 further comprises a backwater float ball valve 64, which comprises a first float ball 642 hinged to the backwater pipeline 5 through a first connecting rod 641, and a first plug 643 connected to the bottom of the first connecting rod 641 and blocked in the water inlet end 51; when the water level in the water collecting cavity 11 rises, the first float ball 642 rises and drives the first plug 643 to rotate upward to disengage from the water inlet end 51, and when the water level in the water collecting cavity 11 drops, the first float ball 642 drops and drives the first plug 643 to reset to block the water inlet end 51. Therefore, by providing the backwater float ball valve 64, the water inlet end 51 of the backwater pipeline 5 is mechanically controlled to automatically open and close with the change of the water level in the water collecting cavity 11 without increasing the cost of electric control. Specifically, when the water level in the water collecting cavity 11 drops to a low position, the first plug 643 blocks the water inlet end 51 to ensure the air pressure in the backwater pipeline 5, so as to avoid the situation that the water level in the water collecting cavity 11 is low, there is no water in the backwater pipeline 5, and the water inlet pipeline 2 inlet makes the siphon pipeline and the backwater pipeline 5 produce siphon effect, and the air in the siphon backwater pipeline 5 causes abnormal noise. After the water level in the water collecting cavity 11 rises to a certain height, the first plug 643 automatically disengages to open the water inlet end 51, and the backwater pipeline 5 inlet; thereby ensuring that the siphon effect is successfully performed when the water level in the water collecting cavity 11 rises to sufficient water in the backwater pipeline 5, and the second plug 463 blocks the water inlet end 51 when the water level in the water collecting cavity 11 drops to less or no water in the backwater pipeline 5, so as to avoid the siphon air producing abnormal noise and improve the stability of the shower device during use.

[0051] It should be noted that the implementation principle and technical effects of the present embodiment are the same as those of embodiment one. For brevity, the present embodiment is not mentioned in the corresponding content of embodiment one.

[0052] Embodiment three

[0053] Reference Figures 7-8 In order to meet the different needs of users, the control of the drainage control mechanism 4 is also replaced by a physical button control, so that the shower device can be suitable for elderly users who are more difficult to operate intelligent control. The difference between the present embodiment and embodiment two is that:

[0054] The lower end of the drain pipeline 3 extends laterally to one side to form a water outlet end 31 at the top of the water collecting cavity 11. The drain control mechanism 4 includes a mechanical control valve 44 for controlling the on-off between the water inlet pipeline 2 and the drain pipeline 3, a mechanical button 45 arranged on the side wall of the pipe cavity 12 and used for controlling the opening and closing of the mechanical control valve 44, and a drain float ball valve 46 arranged at the water outlet end 31 of the drain pipeline 3. The drain float ball valve 46 includes a second float ball 462 hinged to the drain pipeline 3 through a second connecting rod 461 and a second plug 463 connected to the top of the second connecting rod 461. Specifically, the control of the mechanical button 45 on the mechanical control valve 44 can refer to the prior application with the title of a mechanical drain shower device and the application number of 202421294272.2. When the water flowing into the second water inlet is cold water, the temperature memory spring retracts to drive the drain plug to separate from the inner cylinder to open the drain passage for drainage. When the water temperature flowing into the second water inlet rises to a set temperature, the temperature memory spring retracts to drive the drain plug to block the water inlet end of the drain cylinder to close the drain passage and stop drainage. The water outlet button drives the driving member to swing to achieve the blocking or separation of the water outlet valve from the water outlet hole to close or open the water outlet passage, thereby achieving the opening of the water outlet passage by simple mechanical operation of the water outlet button after the drain valve closes the drain passage to stop the drainage of the drain outlet, and the discharge of warm water from the drain outlet. Correspondingly, in the present embodiment, when the water in the water inlet pipeline 2 is cold water, the drain outlet of the mechanical control valve 44 is automatically opened to discharge cold water into the water collecting cavity 11 until the temperature memory spring retracts to close.

[0055] When the water level in the water collecting cavity 11 rises, the second float ball 462 rises and drives the second plug 463 to rotate upward to block the water outlet end 31. When the water level in the water collecting cavity 11 drops, the second float ball 462 drops and drives the second plug 463 to rotate downward to separate from the water outlet end 31. Thus, the mechanical button 45 and the mechanical control valve 44 replace the drain electric control valve 42, and the drain float ball valve 46 replaces the water level detection device 43, so that the discharge of cooling water from the drain pipeline 3 and the return of cooling water from the return pipeline 5 are both mechanically controlled, thereby replacing the control of the shower device with physical button control, which is suitable for old users and improves the applicability of the shower device.

[0056] It should be noted that the implementation principle and the technical effects of the present embodiment and embodiment two are the same. For brevity, the present embodiment is not mentioned, and the corresponding content in embodiment one can be referred to.

[0057] Embodiment Four

[0058] In order to further meet the different shower needs of users, the difference between the present embodiment and embodiment one or embodiment two is that:

[0059] The water inlet pipeline 2 comprises a warm water pipeline, the warm water pipeline, the water outlet pipeline 3, the water collecting cavity 11 and the water return pipeline 5 are sequentially connected in circulation, the water outlet control mechanism 8 is a water outlet control valve for controlling the on-off between the warm water pipeline and the shower pipeline 7, specifically, the water outlet control valve can be an electromagnetic valve, the opening and closing of the water outlet control valve is controlled by the detection result of the temperature sensing device 41, when the shower device starts to be used, the water inlet of the warm water pipeline and the water return pipeline 5 return water to the warm water pipeline through the siphon passage 21, when the temperature sensing device 41 detects that the water temperature in the warm water pipeline is low, the water flow will continuously circulate in the warm water pipeline, the water outlet pipeline 3, the water collecting cavity 11 and the water return pipeline 5, until the temperature sensing device 41 detects that the water temperature in the warm water pipeline reaches the set temperature, the water outlet control mechanism 8 opens the water outlet, so as to meet the set requirement of the user on the water outlet temperature of the water outlet device on the basis of saving the cooling water.

[0060] It should be pointed out that the implementation principle and the technical effects of the embodiment are the same as those of the first embodiment or the second embodiment, for brief description, the embodiment is not mentioned, and the corresponding content in the first embodiment can be referred to.

[0061] The above only describes the preferred embodiments of the utility model, and is not used to limit the utility model, for the person skilled in the art, the utility model can have various changes and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A water saving shower device, characterised in that, The application relates to a shower device, which comprises a shell (1) divided into a pipe cavity (12) and a water collecting cavity (11), a water inlet pipe (2) penetrating through the side wall of the pipe cavity (12), a shower pipe (7) connected with the water inlet pipe (2) through a water outlet control mechanism (8), a water drainage structure comprising a water drainage pipe (3) connecting the water inlet pipe (2) and the water collecting cavity (11), a water drainage control mechanism (4) for controlling the water inlet pipe (2) to drain water to the water collecting cavity (11) through the water drainage pipe (3), a water return structure comprising a water return pipe (5) connecting the water inlet pipe (2) and the water collecting cavity (11), and a water return control mechanism (6) for controlling the water inlet pipe (2) to return water to the water inlet pipe (2) through the water return pipe (5). The water drainage control mechanism (4) comprises a temperature sensing device (41) for detecting the water temperature in the water inlet pipe (2), a water drainage electric control valve (42) for controlling the on-off connection between the water inlet pipe (2) and the water drainage pipe (3), and a water level detecting device (43) for detecting the water level in the water collecting cavity (11). The water return control mechanism (6) comprises a water flow sensing device (61) for detecting the water flow in the water inlet pipe (2), and a water return electric control valve (62) for controlling the on-off connection between the water inlet pipe (2) and the water return pipe (5). The pipe cavity (12) and the water collecting cavity (11) are arranged in a vertical manner, the lower end of the water return pipe (5) extends downward to the bottom of the water collecting cavity (11), and a siphon passage (21) is arranged in the water inlet pipe (2) and passes through the upper end of the water return pipe (5); when water flows through the siphon passage (21) in the water inlet pipe (2), the water return pipe (5) sucks the cooling water in the water collecting cavity (11) upward to the water inlet pipe (2).

2. A water saving shower unit as claimed in claim 1 wherein, The inner diameter of the siphon passage (21) corresponding to the upper end of the water return pipe (5) is smaller than the inner diameter of the water inlet pipe (2), and the inner diameter of the siphon passage (21) gradually increases along the water inlet direction of the water inlet pipe (2).

3. A water saving shower unit as claimed in claim 1 wherein, The lower end of the water return pipe (5) extends laterally to form a water inlet end (51), and the water return control mechanism (6) comprises a one-way valve (63) arranged in the upper end of the water return pipe (5) and corresponding to the siphon passage (21) on the water outlet side.

4. A water saving shower unit as claimed in claim 1 wherein, The water return control mechanism (6) further comprises a water return float ball valve (64), which comprises a first float ball (642) hinged to the water return pipe (5) through a first connecting rod (641), and a first plug (643) connected to the bottom of the first connecting rod (641) and arranged in the water inlet end (51); when the water level in the water collecting cavity (11) rises, the first float ball (642) floats up and drives the first plug (643) to rotate upward and separate from the water inlet end (51); when the water level in the water collecting cavity (11) drops, the first float ball (642) drops and drives the first plug (643) to reset and block the water inlet end (51).

5. A water saving shower unit as claimed in claim 4 wherein, ​ 6. A water saving shower unit as claimed in claim 4 wherein, ​ 7. A water saving shower unit as claimed in claim 6 wherein, ​ 8. A water saving shower unit as claimed in claim 1 wherein, The pipe cavity (12) and the water collecting cavity (11) are distributed up and down, the lower end of the drain pipeline (3) extends laterally to form a water outlet end (31) on the top of the water collecting cavity (11), the drain control mechanism (4) includes a mechanical control valve (44) for controlling the on-off between the water inlet pipeline (2) and the drain pipeline (3), a mechanical button (45) arranged on the side wall of the pipe cavity (12) and used for controlling the opening and closing of the mechanical control valve (44), a drain float ball valve (46) arranged at the water outlet end (31) of the drain pipeline (3), the drain float ball valve (46) includes a second float ball (462) hinged to the drain pipeline (3) through a second connecting rod (461), and a second plug (463) connected to the top of the second connecting rod (461); when the water level in the water collecting cavity (11) rises, the second float ball (462) rises and drives the second plug (463) to rotate upward to block the water outlet end (31), when the water level in the water collecting cavity (11) drops, the second float ball (462) drops and drives the second plug (463) to rotate downward to separate from the water outlet end (31).

9. A water saving shower unit as claimed in claim 1 wherein, The water inlet pipeline (2) includes a hot water pipeline (22) and a cold water pipeline (23), the drain pipeline (3) communicates the hot water pipeline (22) and the water collecting cavity (11), the backwater pipeline (5) communicates the cold water pipeline (23) and the water collecting cavity (11), and the water outlet control mechanism (8) is a mixing valve connected with the hot water pipeline (22), the cold water pipeline (23) and the shower pipeline (7).

10. A water saving shower unit as claimed in claim 1 wherein, The water inlet pipeline (2) includes a warm water pipeline, the warm water pipeline, the drain pipeline (3), the water collecting cavity (11) and the backwater pipeline (5) are connected in sequence, and the water outlet control mechanism (8) is a water outlet control valve for controlling the on-off between the warm water pipeline and the shower pipeline (7).

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