A residual water drainage device and shower equipment

Abstract

This invention discloses a residual water drainage device and a shower device. The residual water drainage device includes a first connector, a second connector, a connecting pipe, and an on / off mechanism. The first connector is used to connect to the shower head outlet of the shower body, and a first water passage hole is opened in the inner wall of the first connector. The second connector is used to connect to the shower body, and a second water passage hole is provided on the second connector. The connecting pipe is connected between the first water passage hole and the second water passage hole. The on / off mechanism is located in the inner cavity or on the connecting pipe. After the first connector and the second connector of this invention are installed on the shower head body, the connecting pipe connects the water passage holes of the two connectors. After the shower head is turned off, the water stored in the internal flow channel and shower head pipe will be discharged to the ground from the connected second connector under the action of gravity, reducing the residual water inside the shower head pipe. The on / off mechanism ensures that water will not flow from the water passage hole to the second connector and cause water leakage when the shower head is in use.

Description

Technical Field

[0001] This invention relates to the field of shower equipment technology, and in particular to a residual water drainage device and a shower equipment. Background Technology

[0002] Currently, to achieve the "instant hot water" experience, shower systems generally incorporate a pre-drainage function in the piping between the water heater and the shower control valve. This function works by first draining the cold water from the water heater outlet to the shower control valve before switching back to normal flow, thus reducing the time users spend waiting for hot water.

[0003] However, most existing cooling systems only discharge cold water from the water supply section upstream of the distributor valve, failing to cover the outlet branches downstream. Even after the shower is turned off, a significant amount of water remains in the handheld showerhead, overhead showerhead, water hose, and the showerhead's internal flow channels. This residual water cannot be removed by existing cooling systems, leading to excessively low initial water temperature during the next use and potentially causing bacterial growth and unpleasant odors within the closed water channels. Furthermore, residual water after the showerhead is turned off tends to drip slowly from the nozzles, forming limescale and mold on surfaces such as countertops or floors, affecting cleanliness and extending the product's lifespan. Summary of the Invention

[0004] The present invention aims to at least partially solve one of the aforementioned technical problems in the related art. To this end, the present invention proposes a residual water discharge device.

[0005] To achieve the above objectives, the technical solution of the present invention is as follows:

[0006] The present invention also proposes a shower device having the above-mentioned residual water drainage device.

[0007] According to a first aspect of the present invention, a residual water discharge device includes:

[0008] The first connector has a first water inlet, a first water outlet, and an inner cavity located between the first water inlet and the first water outlet. The first water inlet is used to connect to the shower head outlet of the shower body, and the first water outlet is used to connect to the shower head pipe. The inner cavity wall has a first water passage hole.

[0009] The second connector is used to connect to the shower body, and the second connector is provided with a second water passage hole;

[0010] A connecting pipe is used to connect between the first water inlet and the second water inlet;

[0011] A switching mechanism is provided in the inner cavity or on the connecting pipe;

[0012] When the switching mechanism is located in the inner cavity, the inner cavity forms a first water inlet. The switching mechanism includes a first piston and a first elastic element. The first piston has a flow channel that connects the first water inlet and the first water outlet. The outer side of the first piston and the inner cavity define a drainage chamber. The first water passage is connected to the drainage chamber. The first elastic element provides a spring force to the first piston towards the first water inlet. The first piston has a first state of being disengaged from the first water inlet and a second state of blocking the first water inlet. In the first state, the drainage chamber is connected to the first water outlet through the first water inlet.

[0013] When the switching mechanism is installed on the connecting pipe, a second water outlet is formed on the connecting pipe. The switching mechanism includes a second piston and a second elastic member. The second elastic member provides elastic force to the second piston towards the first water outlet. The second piston has a third state of disengaging from the second water outlet and a fourth state of blocking the second water outlet. In the third state, the first water outlet is connected to the second water outlet through the second water outlet.

[0014] The residual water drainage device according to embodiments of the present invention has at least the following beneficial effects:

[0015] 1. After the first connector and the second connector of the present invention are installed on the shower head body, the connecting pipe connects the water holes of the two connectors. After the shower head is turned off, since the shower head is placed higher than the second water hole of the second connector, the water stored in the internal flow channel and the shower head pipe will be discharged from the connected second connector to the ground under the action of gravity. This greatly reduces the residual water inside the shower head pipe, prevents bacteria from growing in the residual water or causing the initial water temperature to be too low during the next use, and also reduces the amount of water dripping from the shower head rubber particle hole onto people or items on the shelf.

[0016] 2. Since the first and second connectors are connected, to prevent water from flowing from the water inlet to the second connector and causing cross-contamination when the user is using the shower head normally, an on / off mechanism is installed in the first connector or on the connecting pipe. When the user turns on the shower head, the piston is subjected to the inlet water pressure, at which time the inlet water pressure F... 水 >F 弹 The piston compresses the elastic element until it blocks the water inlet, preventing water from flowing through to the second connector. When the user turns off the shower, the water pressure in the shower pipes returns to zero, and the inlet pressure F acting on the piston end face... 水 The pressure disappears, and at this point, the water in the shower pipe only generates a water column pressure F on the piston end face. 水柱 , making F 弹 >F 水柱 (F) 水柱The static pressure of the residual water in the shower pipe due to its own weight allows the piston to disengage from the water outlet under the action of the elastic element, opening the residual water discharge passage.

[0017] According to some embodiments of the present invention, the second connector has a second water inlet end, a second water outlet end, and a first water passage cavity communicating between the second water inlet end and the second water outlet end. The second water inlet end is used to connect to the lower water outlet or cold water outlet of the shower body, and the second water passage hole is formed in the cavity wall of the first water passage cavity.

[0018] According to some embodiments of the present invention, the second water inlet is used to connect to the lower water outlet of the shower body, and a partition is formed between the second water inlet and the first water passage cavity. The partition has spray holes, and water passing through the spray holes can create negative pressure in the first water passage cavity.

[0019] According to some embodiments of the present invention, the second water inlet is used to connect to the lower water outlet of the shower body, and the second water outlet is equipped with a lower water outlet rectifier.

[0020] According to some embodiments of the present invention, when the switching mechanism is disposed in the inner cavity, the switching mechanism further includes a first thermal element, the first thermal element having the characteristic of thermal expansion and contraction, the first thermal element being disposed on the side of the first piston near the first water inlet end, the first thermal element being able to expand when heated to drive the first piston to block the first water outlet; when the switching mechanism is disposed on the connecting pipe, the switching mechanism further includes a second thermal element, the second thermal element having the characteristic of thermal expansion and contraction, the second thermal element being disposed on the side of the second piston near the first water passage, the second thermal element being able to expand when heated to drive the second piston to block the second water outlet.

[0021] According to some embodiments of the present invention, a switching mechanism is further included. There are two first connectors for one-to-one connection with two showerhead outlets of the shower body. The connecting pipe includes a main pipe and two branch pipes. The switching mechanism includes a tee pipe and a sealing element. The first passage of the tee pipe is connected to the second water outlet through the main pipe. The second and third passages of the tee pipe are respectively connected to the two first water outlets through the two branch pipes. The sealing element is movably disposed at the junction of the tee pipes. The sealing element has a fifth, a sixth, and a seventh state. In the fifth state, the sealing element blocks the second passage, and the third passage is connected to the first passage. In the sixth state, the sealing element blocks the third passage, and the second passage is connected to the first passage. In the seventh state, the sealing element simultaneously disengages from both the second and third passages, and both the second and third passages are simultaneously connected to the first passage.

[0022] According to some embodiments of the present invention, the seal is spherical, and a first spherical surface is formed at one end of the second passage near the junction. In the fifth state, the seal cooperates with the first spherical surface to block the second passage, and a second spherical surface is formed at one end of the third passage near the junction. In the sixth state, the seal cooperates with the second spherical surface to block the third passage. In the seventh state, a water-permeable gap is left between the end of the first passage near the junction and the seal.

[0023] According to some embodiments of the present invention, the first piston has a pressure-bearing portion located on the side of the first piston near the first water inlet end. The pressure-bearing portion forms a dynamic seal with the cavity wall of the inner cavity. The cavity wall of the inner cavity is formed with an annular flange, which surrounds the first water outlet. The outer peripheral wall of the first piston, the pressure-bearing portion, the annular flange, and the cavity wall of the inner cavity surround the drainage cavity. The first elastic member is located in the drainage cavity, with one end of the first elastic member abutting against the first piston and the other end abutting against the annular flange.

[0024] According to some embodiments of the present invention, when the switching mechanism is provided on the connecting pipeline, the switching mechanism further includes a housing, the housing is connected to the connecting pipeline, the housing forms a second water passage cavity, the second piston is located in the second water passage cavity, the second water outlet is formed in the second water passage cavity, the second elastic member is located on the side of the second piston facing away from the first water passage hole, and a water passage space is left between the outer peripheral wall of the second piston and the inner peripheral wall of the second water passage cavity.

[0025] A shower device according to a second aspect of the present invention includes the residual water draining device described in the first aspect of the present invention.

[0026] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0027] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0028] Figure 1 This is a schematic diagram of the installation of the residual water drainage device of the first embodiment of the present invention on the shower body;

[0029] Figure 2 This is a schematic diagram of the installation of the residual water drainage device on the shower body according to the second embodiment of the present invention;

[0030] Figure 3 This is a cross-sectional view (first state) of the residual water discharge device according to the first embodiment of the present invention.

[0031] Figure 4 This is a cross-sectional view of the residual water discharge device according to the second embodiment of the present invention;

[0032] Figure 5 This is a cross-sectional view (fourth state) of the switching mechanism according to the second embodiment of the present invention.

[0033] Figure 6 This is a schematic diagram of the installation of the switching mechanism of the present invention on the shower body;

[0034] Figure 7 This is a schematic diagram of the switching mechanism of the present invention in its fifth state;

[0035] Figure 8 This is a schematic diagram of the switching mechanism of the present invention in its seventh state.

[0036] Reference numerals: Shower body 100, shower head outlet 110, lower outlet 120, first connector 200, first inlet 210, first outlet 220, inner cavity 230, first water passage hole 231, first water outlet 232, drain cavity 233, annular flange 234, second connector 300, second water passage hole 310, second inlet 320, second outlet 330, first water passage cavity 340, baffle 350, spray hole 351, lower outlet rectifier 360, connecting pipe 400, main pipe 410, branch pipe 4 20. Switching mechanism 500, first piston 510, flow channel 511, pressure bearing part 512, first elastic element 520, housing 530, second water passage cavity 531, second water inlet 532, water passage space 533, second piston 540, second elastic element 550, second thermal element 560, switching mechanism 600, three-way pipe 610, first passage 611, second passage 612, third passage 613, junction 614, first spherical surface 615, second spherical surface 616, water passage gap 617, sealing element 620. Detailed Implementation

[0037] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0038] Reference Figure 1-5 A residual water discharge device, comprising:

[0039] The first connector 200 has a first water inlet 210, a first water outlet 220, and an inner cavity 230 located between the first water inlet 210 and the first water outlet 220. The first water inlet 210 is used to connect to the shower head outlet 110 of the shower body 100, and the first water outlet 220 is used to connect to the shower head pipe. The inner cavity 230 has a first water passage hole 231 on its cavity wall.

[0040] The second connector 300 is used to connect to the shower body 100, and the second connector 300 is provided with a second water passage hole 310; the first connector 200 and the second connector 300 can be directly threaded into the existing shower body 100 without changing the structure of the existing shower body 100, and have strong versatility; it is understood that the first connector 200 and the second connector 300 are not limited to a separate structure from the shower body 100, but can also be a structure integrally formed with the shower body 100;

[0041] The connecting pipe 400 is connected between the first water passage hole 231 and the second water passage hole 310;

[0042] The switching mechanism 500 is located in the inner cavity 230 or on the connecting pipe 400;

[0043] As a first embodiment of the present invention, such as Figure 3 As shown, when the switching mechanism 500 is disposed in the inner cavity 230, the inner cavity 230 forms a first water inlet 232. The switching mechanism 500 includes a first piston 510 and a first elastic member 520. The first piston 510 has a flow channel 511, which connects the first water inlet 210 and the first water outlet 220. The outer side of the first piston 510 and the inner cavity 230 define a drain cavity 233. The first water passage 231 is connected to the drain cavity 233. The first elastic member 520 provides the first piston 510 with an elastic force that tends towards the first water inlet 210. The first piston 510 has a first state of disengaging from the first water inlet 232 and a second state of blocking the first water inlet 232. In the first state, the drain cavity 233 is connected to the first water outlet 220 through the first water inlet 232.

[0044] As a second embodiment of the present invention, such as Figure 4-5 As shown, when the switching mechanism 500 is installed on the connecting pipe 400, the inner cavity 230 connects the first water inlet 210 and the first water outlet 220. A second water outlet 532 is formed on the connecting pipe 400. The switching mechanism 500 includes a second piston 540 and a second elastic member 550. The second elastic member 550 provides elastic force to the second piston 540 to tend towards the first water outlet 231. The second piston 540 has a third state of disengaging from the second water outlet 532 and a fourth state of blocking the second water outlet 532. In the third state, the first water outlet 231 is connected to the second water outlet 310 through the second water outlet 532.

[0045] Compared to the first embodiment, the second embodiment can reduce the fluid resistance within the first connector 200, thus ensuring the water flow rate of the shower head.

[0046] Working principle: When the user turns on the shower head, the piston is subjected to the inlet water pressure, at which time the inlet water pressure F 水 >F 弹 The piston compresses the elastic element until it blocks the water inlet, preventing water from flowing through to the second connector 300. When the user turns off the shower, the water pressure in the shower pipe returns to zero, and the inlet pressure F acting on the piston end face... 水 The pressure disappears, and at this point, the water in the shower pipe only generates a water column pressure F on the piston end face. 水柱 , making F 弹 >F 水柱 (F) 水柱 The static pressure of the residual water in the shower pipe due to its own weight allows the piston to disengage from the water outlet under the action of the elastic element, opening the residual water discharge passage. The water stored in the shower internal flow channel and shower pipe will be discharged to the ground from the second connector 300 under the action of gravity.

[0047] In some embodiments of the present invention, such as Figure 3 As shown, the second connector 300 has a second water inlet end 320, a second water outlet end 330, and a first water passage cavity 340 communicating between the second water inlet end 320 and the second water outlet end 330. The second water inlet end 320 is used to connect to the lower water outlet 120 or the cold water outlet of the shower body 100, and the second water passage hole 310 is opened in the cavity wall of the first water passage cavity 340.

[0048] In some embodiments of the present invention, such as Figure 3 As shown, the second water inlet 320 is connected to the lower water outlet 120 of the shower body 100. A partition 350 is formed between the second water inlet 320 and the first water passage chamber 340. A spray hole 351 is opened on the partition 350. Water passing through the spray hole 351 can create a negative pressure in the first water passage chamber 340. Multiple spray holes 351 can be provided. After the user finishes using the shower head and turns off the water, the piston is pushed back by the elastic element, opening the residual water drainage passage. At this time, the lower water outlet is opened, and water flows out at high speed through the spray hole 351. According to the Venturi principle, the first water passage chamber 340 forms a low-pressure area, generating suction, which quickly sucks out the water stored in the shower head and shower pipe, improving the residual water drainage efficiency.

[0049] It should be noted that opening the bottom drain will generate suction F in the residual water drainage path. 吸 The suction force acting on the piston end face will produce a force in the direction of F. 弹 Conversely, to ensure the residual water discharge passage remains open during the emptying process, the following mechanical condition must be met: F 弹 >F 水柱 +F吸 Under these conditions, the residual water drainage path remains open, and the negative pressure suction can quickly suck out the water stored in the shower head and shower head pipes.

[0050] In some embodiments of the present invention, the second water inlet 320 is used to connect to the lower water outlet 120 of the shower body 100, and the second water outlet 330 is equipped with a lower water outlet rectifier 360. The lower water outlet rectifier 360 can organize the chaotic and splashing water flow into a regular and stable water column, optimize the water flow pattern, and improve the water use experience.

[0051] In some embodiments of the present invention, when the switching mechanism 500 is disposed in the inner cavity 230, the switching mechanism 500 further includes a first thermal element. The first thermal element has the characteristic of thermal expansion and contraction. The first thermal element is disposed on the side of the first piston 510 near the first water inlet 210. The first thermal element can expand when heated to drive the first piston 510 to block the first water outlet 232 (the first thermal element is not shown in the figure). When the switching mechanism 500 is disposed on the connecting pipe 400, such as... Figure 5 As shown, the on / off mechanism 500 also includes a second thermistor 560. The second thermistor has the characteristic of thermal expansion and contraction. The second thermistor 560 is located on the side of the second piston 540 near the first water inlet 231. The second thermistor 560 can expand when heated to drive the second piston 540 to block the second water outlet 532. The first thermistor and the second thermistor 560 can be shape memory alloy springs or paraffin temperature sensing bulbs.

[0052] When a user temporarily turns off the water during a shower, the residual water drain passage will also open. Since the shower head is placed at a high position, the residual water in the shower head pipe will flow downwards and be discharged under gravity, which may result in a poor user experience. This invention solves the problem by adding a thermal element to the on / off mechanism 500.

[0053] When the shower head is turned on and water is flowing, the piston end face is subjected to water pressure, generating a downward inlet pressure F. 水 At the same time, the thermistor expands thermally due to the water temperature, creating a downward tension F. 热 At this time, the resultant force F 水 +F 热 > Elastic force F 弹 This pushes the piston downwards, closing the residual water drainage passage. In this state, the shower head continues to spray water normally, and water will not flow through the connecting pipe 400 to the lower outlet 120, thus preventing leakage. It should be noted that to ensure the residual water drainage passage is closed even when cold water is supplied to the shower head (i.e., the thermosensitive element does not expand), the elastic force of the elastic element must meet the inlet water pressure F. 水 >F 弹 >F 水柱 Therefore, based on this, the resultant force F after hot water is introduced... 水 +F 热It must also be greater than F 弹 .

[0054] When the user temporarily turns off the shower, the water pressure in the shower pipes drops to zero, and the inlet water pressure F acting on the piston end face... 水 The water disappears, and at this time, the water in the shower head and pipes generates a water column pressure F on the piston end face. 水柱 Because the thermal element is temporarily in an expanded state after the water is temporarily shut off, the piston end face is also subjected to the tension F of the thermal element. 热 At this time, the mechanical condition is F 弹 <F 水柱 +F 热 The residual water drain channel remains closed to resolve the issue of water leakage at the outlet 120 after the temporary water shut-off.

[0055] When the user finishes showering, the water temperature gradually decreases, causing the thermal element to contract, and its thermal expansion tension F 热 Gradually approaching 0, until F 弹 > F 水柱 +F 热 The elastic element pushes the piston to reset, thereby opening the drain passage for residual water.

[0056] In some embodiments of the present invention, reference is made to... Figure 6-8 It also includes a switching mechanism 600, two first connectors 200 for one-to-one connection with the two shower head outlets 110 of the shower body 100, a connecting pipe 400 including a main pipe 410 and two branch pipes 420, a switching mechanism 600 including a tee pipe 610 and a seal 620, the first passage 611 of the tee pipe 610 is connected to the second water inlet 310 through the main pipe 410, the second passage 612 and the third passage 613 of the tee pipe 610 are respectively connected to the two first water inlets 231 through the two branch pipes 420, and the seal 620. The sealing element 620, movably located at the junction 614 of the three-way pipe 610, has a fifth, sixth, and seventh state. In the fifth state, the sealing element 620 blocks the second passage 612, and the third passage 613 is connected to the first passage 611. In the sixth state, the sealing element 620 blocks the third passage 613, and the second passage 612 is connected to the first passage 611. In the seventh state, the sealing element 620 simultaneously disengages from both the second and third passages 612 and 613, and both the second and third passages 612 and 613 are simultaneously connected to the first passage 611. The two first connectors 200 can be connected to the water outlets of the handheld shower head and the overhead shower head on the shower body 100, respectively.

[0057] For the fifth state, such as Figure 7 As shown, when there is residual water in the shower pipe connected to the third passage 613, while there is no residual water in the shower pipe connected to the second passage 612, then F in the third passage 613... 空 +F 水柱F greater than the second pathway 612 空 (F) 空 (At atmospheric pressure), the sealing element 620, under the weight of the residual water in the third passage 613, seals the second passage 612, thus opening the residual water drainage passage corresponding to the third passage 613. The sixth state is similar. For the seventh state, as... Figure 8 As shown, when there is residual water in the shower pipes connected to the second passage 612 and the third passage 613 at the same time, the seal 620 automatically adjusts its position and distributes the opening degree of the corresponding passage according to the weight of the residual water in the two passages, and at the same time pumps out the residual water in the two passages. The more water there is, the larger the opening degree of the pipe.

[0058] In some embodiments of the present invention, such as Figure 8 As shown, the seal 620 is spherical. The second passage 612 has a first spherical surface 615 formed at one end near the junction 614. In the fifth state, the seal 620 and the first spherical surface 615 cooperate to block the second passage 612. The third passage 613 has a second spherical surface 616 formed at one end near the junction 614. In the sixth state, the seal 620 and the second spherical surface 616 cooperate to block the third passage 613. In the seventh state, a water passage gap 617 is left between the first passage 611 and the seal 620 at one end near the junction 614. The water passage gap 617 ensures that the seal 620 will never block the first passage 611 no matter how it moves.

[0059] In some embodiments of the present invention, such as Figure 3 As shown, the first piston 510 has a pressure-bearing part 512, which is located on the side of the first piston 510 near the first water inlet end 210. The pressure-bearing part 512 forms a dynamic seal with the cavity wall of the inner cavity 230. The cavity wall of the inner cavity 230 has an annular flange 234, which forms a first water outlet 232. The outer peripheral wall of the first piston 510, the pressure-bearing part 512, the annular flange 234 and the cavity wall of the inner cavity 230 form a drainage cavity 233. The first elastic member 520 is located in the drainage cavity 233. One end of the first elastic member 520 abuts against the first piston 510 and the other end abuts against the annular flange 234.

[0060] In some embodiments of the present invention, such as Figure 5 As shown, when the switching mechanism 500 is installed on the connecting pipe 400, the switching mechanism 500 also includes a housing 530. The housing 530 is connected to the connecting pipe 400. The housing 530 forms a second water passage cavity 531. The second piston 540 is located in the second water passage cavity 531. The second water passage port 532 is formed in the second water passage cavity 531. The second elastic member 550 is located on the side of the second piston 540 facing away from the first water passage hole 231. A water passage space 533 is left between the outer peripheral wall of the second piston 540 and the inner peripheral wall of the second water passage cavity 531.

[0061] A shower device includes the aforementioned residual water drainage device.

[0062] In the description of this invention, it should be understood that the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0063] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0064] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A residual water discharge device, characterized in that, include: The first connector (200) has a first water inlet (210), a first water outlet (220) and an inner cavity (230) located between the first water inlet (210) and the first water outlet (220). The first water inlet (210) is used to connect to the shower head outlet (110) of the shower body (100), and the first water outlet (220) is used to connect to the shower head pipe. The inner cavity (230) has a first water passage hole (231) on its cavity wall. The second connector (300) is used to connect to the shower body (100), and the second connector (300) is provided with a second water passage hole (310); A connecting pipe (400) is connected between the first water inlet (231) and the second water inlet (310); A switching mechanism (500) is provided in the inner cavity (230) or on the connecting pipe (400); When the switching mechanism (500) is disposed in the inner cavity (230), the inner cavity (230) forms a first water inlet (232). The switching mechanism (500) includes a first piston (510) and a first elastic member (520). The first piston (510) has a flow passage (511) that connects the first water inlet (210) and the first water outlet (220). The outer side of the first piston (510) and the inner cavity (230) define a drain cavity (23). 3) The first water passage (231) is connected to the drain cavity (233), and the first elastic element (520) provides the first piston (510) with an elastic force that tends towards the first water inlet (210). The first piston (510) has a first state of being disengaged from the first water outlet (232) and a second state of blocking the first water outlet (232). In the first state, the drain cavity (233) is connected to the first water outlet (220) through the first water outlet (232). When the switching mechanism (500) is provided on the connecting pipe (400), a second water inlet (532) is formed on the connecting pipe (400). The switching mechanism (500) includes a second piston (540) and a second elastic member (550). The second elastic member (550) provides a spring force to the second piston (540) towards the first water inlet (231). The second piston (540) has a third state of disengaging from the second water inlet (532) and a fourth state of blocking the second water inlet (532). In the third state, the first water inlet (231) is connected to the second water inlet (310) through the second water inlet (532).

2. The residual water discharge device according to claim 1, characterized in that, The second connector (300) has a second water inlet (320), a second water outlet (330), and a first water passage cavity (340) communicating between the second water inlet (320) and the second water outlet (330). The second water inlet (320) is used to connect to the lower water outlet (120) or the cold water outlet of the shower body (100). The second water passage hole (310) is opened in the cavity wall of the first water passage cavity (340).

3. The residual water discharge device according to claim 2, characterized in that, The second water inlet (320) is used to connect to the lower water outlet (120) of the shower body (100). A partition (350) is formed between the second water inlet (320) and the first water passage cavity (340). A spray hole (351) is opened on the partition (350). Water passing through the spray hole (351) can create a negative pressure in the first water passage cavity (340).

4. The residual water discharge device according to claim 2, characterized in that, The second water inlet (320) is used to connect to the lower water outlet (120) of the shower body (100), and the second water outlet (330) is equipped with a lower water outlet rectifier (360).

5. The residual water discharge device according to claim 1, characterized in that, When the switching mechanism (500) is located in the inner cavity (230), the switching mechanism (500) further includes a first thermal element. The first thermal element has the characteristic of thermal expansion and contraction. The first thermal element is located on the side of the first piston (510) near the first water inlet (210). The first thermal element can expand when heated to drive the first piston (510) to block the first water outlet (232). When the switching mechanism (500) is located on the connecting pipe (400), the switching mechanism (500) further includes a second thermal element (560). The second thermal element has the characteristic of thermal expansion and contraction. The second thermal element (560) is located on the side of the second piston (540) near the first water passage (231). The second thermal element (560) can expand when heated to drive the second piston (540) to block the second water outlet (532).

6. The residual water discharge device according to claim 1, characterized in that, It also includes a switching mechanism (600). There are two first connectors (200) for one-to-one connection with the two showerhead outlets (110) of the shower body (100). The connecting pipe (400) includes a main pipe (410) and two branch pipes (420). The switching mechanism (600) includes a three-way pipe (610) and a sealing element (620). The first passage (611) of the three-way pipe (610) is connected to the second water inlet (310) through the main pipe (410). The second passage (612) and the third passage (613) of the three-way pipe (610) are respectively connected to the two first water inlets (231) through the two branch pipes (420). The sealing element (620) is removable. The sealing element (620) is dynamically installed at the junction (614) of the three-way pipe (610). The sealing element (620) has a fifth state, a sixth state, and a seventh state. In the fifth state, the sealing element (620) blocks the second passage (612), and the third passage (613) is connected to the first passage (611). In the sixth state, the sealing element (620) blocks the third passage (613), and the second passage (612) is connected to the first passage (611). In the seventh state, the sealing element (620) is simultaneously disconnected from the second passage (612) and the third passage (613), and the second passage (612) and the third passage (613) are simultaneously connected to the first passage (611).

7. The residual water discharge device according to claim 6, characterized in that, The seal (620) is spherical, and the second passage (612) has a first spherical surface (615) formed at one end near the junction (614). In the fifth state, the seal (620) cooperates with the first spherical surface (615) to block the second passage (612). The third passage (613) has a second spherical surface (616) formed at one end near the junction (614). In the sixth state, the seal (620) cooperates with the second spherical surface (616) to block the third passage (613). In the seventh state, a water-permeable gap (617) is left between the first passage (611) near the junction (614) and the seal (620).

8. The residual water discharge device according to claim 1, characterized in that, The first piston (510) has a pressure-bearing part (512), which is located on the side of the first piston (510) near the first water inlet (210). The pressure-bearing part (512) forms a dynamic seal with the cavity wall of the inner cavity (230). The cavity wall of the inner cavity (230) has an annular flange (234), which surrounds the first water outlet (232). The outer peripheral wall of the first piston (510), the pressure-bearing part (512), the annular flange (234), and the cavity wall of the inner cavity (230) surround the drainage cavity (233). The first elastic member (520) is located in the drainage cavity (233). One end of the first elastic member (520) abuts against the first piston (510), and the other end abuts against the annular flange (234).

9. The residual water discharge device according to claim 1, characterized in that, When the switching mechanism (500) is provided on the connecting pipe (400), the switching mechanism (500) also includes a housing (530), the housing (530) is connected to the connecting pipe (400), the housing (530) forms a second water passage cavity (531), the second piston (540) is located in the second water passage cavity (531), the second water outlet (532) is formed in the second water passage cavity (531), the second elastic member (550) is located on the side of the second piston (540) facing away from the first water passage hole (231), and a water passage space (533) is left between the outer peripheral wall of the second piston (540) and the inner peripheral wall of the second water passage cavity (531).

10. A shower device, characterized in that, Includes the residual water discharge device as described in any one of claims 1-9.

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