Automatically regulating reflux three-way valve and its mixing center

Abstract

The present invention discloses an automatic regulating reflux three-way valve and a water mixing center thereof, wherein the three-way valve comprises a valve body with a valve cavity therein, the valve body is provided with a water supply inlet, a water supply outlet and a return water inlet which are connected to the valve cavity, the water supply outlet, the water supply inlet and the return water inlet are sequentially arranged at intervals of 90° around the circumference of the valve body; a valve core is rotatably installed in the valve cavity, and the valve core is sealed and matched with the inner wall of the valve cavity; the valve core has a direct water supply level which completely blocks the return water inlet, a mixed water supply level which partially or not blocks the return water inlet, and a water-off level which completely blocks the supply water inlet. The automatic regulating reflux three-way valve of the present invention can adjust the degree of blocking of the return water inlet by the valve core by adjusting the rotation angle of the valve core, thereby controlling the mixing amount of low-temperature water and achieving the purpose of accurately adjusting the final water supply temperature.

Description

Technical Field

[0001] The invention belongs to the technical field of heating facilities, and in particular relates to an automatic regulating reflux three-way valve and a water mixing center thereof. Background Art

[0002] Floor heating is a widely used heating facility. Currently, the heat medium for floor heating is usually hot water. The temperature of the hot water output by the heating network is the same, but the requirements of the heating parameters for each heating user connected to the heating network are different. Therefore, it is necessary to be able to adjust the heating parameters at any time.

[0003] In order to solve the above problems, most existing residential heating systems require the installation of a constant temperature water mixing center that can achieve a constant water temperature function. For example, the Chinese utility model patent with the publication number CN203642300U also discloses a floor heating water mixing device, which is arranged between the high-temperature water inlet, the low-temperature water return port, the water distributor inlet, and the water collector outlet, and includes a circulation pump, a check valve, a water inlet four-way, and a water return three-way; wherein the water inlet four-way is respectively connected to the check valve outlet, the high-temperature water inlet, the water distributor inlet and the screw plug, and the water return three-way is respectively connected to the water collector outlet and the circulation pump inlet, and the floor heating water mixing device also includes a three-way water mixing valve driven by a thermoelectric valve, a temperature probe, a liquid crystal thermostat, and a temperature and pressure integrated meter, wherein the three-way water mixing valve is respectively connected to the low-temperature water return port, the check valve inlet and the circulation pump outlet, the temperature probe is arranged on the water inlet four-way, the liquid crystal thermostat is respectively electrically connected to the thermoelectric valve, the circulation pump start switch and the temperature probe, and the temperature and pressure integrated meter is connected to the water return three-way.

[0004] The three-way mixing valve used in the floor heating water mixing device includes a valve body, a first channel connected to the low-temperature return water port, a second channel connected to the circulation pump outlet, a third channel connected to the check valve inlet and a valve stem connected to the thermoelectric valve, a first through hole is provided between the first channel and the second channel, a second through hole is provided between the second channel and the third channel, a first step portion that can close the first through hole and a second step portion that can close the second through hole are provided on the valve stem, and when the first step portion closes the first through hole, the second through hole is connected, at this time the circulation pump outlet is connected to the check valve inlet, and the low-temperature water is completely mixed into the high-temperature inlet water; when the second step portion closes the second through hole, the first through hole is connected, at this time the circulation pump outlet is connected to the low-temperature return water port, and the low-temperature water is directly returned.

[0005] The shortcomings of this floor heating water mixing device are: the three-way water mixing valve can only realize the two functions of "using all low-temperature water for mixing water" and "returning all low-temperature water", and cannot adjust the proportion of low-temperature water mixed into high-temperature incoming water according to actual requirements; the entire water mixing device has a complex structure and high cost. Summary of the invention

[0006] The purpose of the invention is to provide an automatic regulating reflux three-way valve and a water mixing center thereof which can adjust the mixing ratio of low-temperature return water and accurately adjust the water supply temperature.

[0007] To achieve the above-mentioned object of the invention, the technical solution of the present invention is as follows:

[0008] An automatic regulating reflux three-way valve comprises a valve body with a valve cavity therein, the valve body is provided with a water supply inlet, a water supply outlet and a return water inlet which are connected to the valve cavity, and the water supply outlet, the water supply inlet and the return water inlet are sequentially arranged around the valve body at intervals of 90°;

[0009] A valve core is rotatably installed in the valve cavity, and the valve core is sealed with the inner wall of the valve cavity; the valve core has a direct water supply level that completely blocks the return water inlet, a mixed water supply level that partially or not blocks the return water inlet, and a water shut-off level that completely blocks the water supply inlet.

[0010] The automatic regulating return three-way valve of the present invention has three working states, which can be switched among by rotating the valve core. Among them, when the valve core completely blocks the water supply inlet, the heating network does not supply water; when the valve core completely blocks the return water inlet, all the high-temperature water flowing into the valve cavity from the water supply inlet flows out from the water supply outlet; when the valve core partially or does not block the return water inlet, the low-temperature water flowing into the valve cavity from the return water inlet is also mixed with the high-temperature water and flows out from the water supply outlet; by adjusting the rotation angle of the valve core, the degree of blocking of the return water inlet by the valve core can be adjusted, thereby controlling the mixing amount of low-temperature water, and achieving the purpose of accurately adjusting the final water supply temperature.

[0011] In the above-mentioned automatic regulating reflux three-way valve, the valve cavity is cylindrical, and the valve core includes a columnar body that slides and seals with the inner wall of the valve cavity, and a water supply channel connecting the water supply inlet and the water supply outlet, and a mixed water channel connecting the return water inlet and the water supply outlet are formed on the columnar body. The advantage of the cylindrical valve cavity is that the structure is compact, and a water supply outlet, a water supply inlet and a return water inlet with larger openings can be opened in the circumference of the valve cavity, and at the same time, there will not be much more valve cavity space on the upper and lower sides of the water supply outlet, the water supply inlet and the return water inlet; the water flows in the valve cavity in a straight-in and straight-out state, which makes it almost impossible to have a slow-flow zone in the valve cavity, and it is not easy to deposit dirt, so there is no need to open a sewage outlet on the valve body.

[0012] In the above-mentioned automatic regulating reflux three-way valve, the columnar body includes a disc-shaped upper sealing end and a lower sealing end, and a shielding part connecting the upper sealing end and the lower sealing end. The upper sealing end, the lower sealing end and the shielding part enclose a water channel, and the water supply channel and the mixed water channel are both located in the water channel. When the columnar body rotates circumferentially in the valve cavity, the position of the shielding part determines the working state of the valve core; the upper sealing end located above the water channel slides and seals with the inner wall of the valve cavity, so that the water flow only flows through the water channel and does not overflow to the outside of the valve cavity, reducing the sealing connection requirements between the valve body and the valve cover. The lower sealing end located below the water channel also slides and seals with the inner wall of the valve cavity. On the one hand, it is set to maintain the structural stability of the entire valve core. On the other hand, a boss can be set on the lower sealing end, and a second countersunk hole matched with the boss is opened on the bottom surface of the valve cavity to realize the positioning of the valve core.

[0013] Since the water supply outlet and the return water inlet are arranged at an interval of 180°, in order to ensure that the water trough has a larger circumferential opening, in the above-mentioned automatic regulating reflux three-way valve, the shielding portion has a fan-shaped cross-section, and the central angle of the fan-shaped cross-section is not greater than 90 degrees.

[0014] The fan-shaped shielding part with a central angle of no more than 90 degrees makes the water channel in a swirling state, which is not conducive to the low-temperature water flowing from the return water inlet to the water supply outlet. Therefore, in the above-mentioned automatic regulating reflux three-way valve, the vertex of the shielding part deviates from the central axis of the columnar body to the side facing away from the water channel. In this way, the shielding part can reduce the obstruction of the water flow from the return water inlet to the water supply outlet.

[0015] At the same time, in the above-mentioned automatic regulating reflux three-way valve, a first diversion surface is provided at the vertex of the shielding part, and the first diversion surface is connected to the outer arc surface of the shielding part through the concave arc-shaped diversion surface. The first diversion surface replacing the vertex further reduces the obstruction of the shielding part to the water flow from the return water inlet to the water supply outlet. At the same time, the water flow can also flow to the water supply outlet along the arc-shaped diversion surface, the first diversion surface, and the arc-shaped diversion surface in sequence, and the diversion effect is good.

[0016] In the above-mentioned automatic regulating reflux three-way valve, the openings of the water supply outlet and the return water inlet are larger in the circumferential direction of the valve cavity; in the axial direction of the valve cavity, the openings of the water supply outlet and the return water inlet are smaller. In this way, when adjusting the mixed water temperature, the valve core has a larger rotation angle at the water supply outlet and the return water inlet, so that the adjustment accuracy of the mixed water temperature is higher.

[0017] In the above-mentioned automatic regulating reflux three-way valve, the openings of the water supply outlet and the return water inlet are both hexagonal. On the circumference of the valve cavity, a second drainage surface is provided at the vertex of the hexagonal opening, and the second drainage surface is connected to the two surfaces forming the vertex. Since the distance between the two vertexes on the circumference of the valve cavity is the largest, the space at the vertex is relatively small; when the water flows out of the valve cavity, it is very easy to form a vortex at the vertex. Cutting off the second drainage surface formed by the vertex is conducive to eliminating the vortex and maintaining the stability of the water flow.

[0018] The automatic regulating reflux three-way valve of the present invention also includes a valve cover sealed with the valve body, the valve core has a rotating shaft extending outside the valve body, the valve cover is provided with a through hole for the rotating shaft to pass through, and a driving mechanism for driving the rotating shaft to rotate is fixedly installed on the valve cover.

[0019] The water mixing center for automatically adjusting the backflow of the present invention comprises a water mixer, a water distributor and a water collector, wherein the water distributor is connected to the water supply outlet of the water mixer, and the water outlet of the water collector is respectively connected to the heat network and the water return inlet of the water mixer through a water return tee;

[0020] The water mixer is the above-mentioned automatic regulating reflux three-way valve. The water outlet end of the water collector is provided with a temperature sensor for detecting the return water temperature. The rotating shaft in the automatic regulating reflux four-way valve is connected to the driving mechanism, and the driving mechanism and the temperature sensor are both connected to the controller.

[0021] In the present invention, the water outlet end of the water collector is connected to the water mixer and the heat source respectively through the water return tee. When the water mixer does not allow the return water to enter, the return water returns to the heat source.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] The automatic regulating return three-way valve of the present invention has three working states, which can be switched among by rotating the valve core. Among them, when the valve core completely blocks the water supply inlet, the heating network does not supply water; when the valve core completely blocks the return water inlet, all the high-temperature water flowing into the valve cavity from the water supply inlet flows out from the water supply outlet; when the valve core partially or does not block the return water inlet, the low-temperature water flowing into the valve cavity from the return water inlet is also mixed with the high-temperature water and flows out from the water supply outlet; by adjusting the rotation angle of the valve core, the degree of blocking of the return water inlet by the valve core can be adjusted, thereby controlling the mixing amount of low-temperature water, and achieving the purpose of accurately adjusting the final water supply temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the structure of the automatic regulating reflux three-way valve of the present invention;

[0025] Figure 2It is a structural schematic diagram of the automatic regulating reflux three-way valve of the present invention from another perspective;

[0026] Figure 3 It is a schematic diagram of the explosion structure of the automatic regulating reflux three-way valve of the present invention;

[0027] Figure 4 It is a schematic diagram of the structure of the return water inlet side of the automatic regulating return three-way valve of the present invention;

[0028] Figure 5 for Figure 3 A schematic diagram of the structure of the middle valve core from another perspective;

[0029] Figure 6 It is a schematic diagram of the structure of the automatic adjustment of the reflux mixing water center of the present invention. DETAILED DESCRIPTION

[0030] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0031] Example 1

[0032] like Figure 1 , Figure 2 and Figure 3 As shown, the present embodiment is an automatic regulating reflux three-way valve, comprising a valve body 1 with a valve cavity 11 therein, the valve cavity 11 is cylindrical, and a water supply inlet 12, a water supply outlet 13 and a return water inlet 14 connected to the valve cavity 11 are arranged in sequence at intervals of 90 degrees around the outer circumference of the valve body 1. The water supply inlet 12 is also provided with a heat network 200 heat network 200 water supply pipe interface 15 for connecting to a heat source, the water supply outlet 13 is provided with a user water supply pipe interface 16 for connecting to a water distributor 300, and the return water inlet 14 is provided with a user return water pipe interface 17 for connecting to a water collector 500; the heat network 200 heat network 200 water supply pipe interface 15, the user water supply pipe interface 16 and the user return water pipe interface 17 are all integrally formed with the valve body 1.

[0033] In this embodiment, one end of the valve cavity 11 is closed, and at the other end of the valve cavity 11, the valve body 1 is fixedly connected to the valve cover 2 through the flange connection 3. The valve cover 2 has a protrusion 21 extending into the valve cavity 11. The protrusion 21 slides and seals with the inner wall of the valve cavity 11.

[0034] like Figure 3 Shown, combined Figure 1 and Figure 2It can be seen that the flange connector 3 includes a first flange 31 integrally formed with the valve body 1 and a second flange 32 integrally formed with the valve cover 2, wherein the second flange 32 is provided with a plurality of external threaded holes 32a, and the first flange 31 is provided with threaded grooves 31a corresponding to each external threaded hole 32a one by one, and the valve body 1 and the valve cover 2 can be fixedly connected by installing external fastening bolts (not shown in the figure) between the external threaded holes 32a and the threaded grooves 31a.

[0035] like Figure 3 Shown, combined Figure 1 and Figure 2 It can be seen that the automatic regulating reflux three-way valve of this embodiment also includes a valve core 4, which includes a columnar body 41 that rotates and seals with the valve cavity 11, and a rotating shaft 42 that is integrally formed with the columnar body 41, and the rotating shaft 42 extends from the valve cavity 11 to the outside of the valve cover 2; a through hole 22 for the rotating shaft 42 to pass through is opened in the center of the valve cover 2, and the through hole 22 passes through the first flange 31 and the boss 21, and the rotating shaft 42 rotates and seals with the through hole 22.

[0036] The part of the rotating shaft 42 located outside the valve cover 2 is connected to the power output end of the driving mechanism (not shown in the figure), and the driving mechanism is used to drive the rotating shaft 42 and the columnar body 41 to rotate; the second flange 32 is provided with a first countersunk hole 32b located on the outer periphery of the through hole 22, and a plurality of internal thread grooves 32c arranged along the circumference of the second flange 32, and the first countersunk hole 32b and the internal thread groove 32c are used to fix the driving mechanism on the valve cover 2.

[0037] Depend on Figure 3 and Figure 5 It can be seen that in this embodiment, the columnar body 41 includes a disc-shaped upper sealing end 41a and a lower sealing end 41b, and a shielding portion 41c connecting the upper sealing end 41a and the lower sealing end 41b. The upper sealing end 41a, the lower sealing end 41b and the shielding portion 41c surround the water channel 41d. The rotating shaft 42 is located at the center of the top surface of the upper sealing end 41a. Figure 5 As shown, the bottom surface of the lower sealing end 41b is also integrally formed with a boss 41e coaxially arranged with the rotating shaft 42, and a second countersunk hole 18 for accommodating the boss 41e is provided at the bottom surface of the valve cavity 11. The rotating mating boss 41e and the second countersunk hole 18 can further position the valve core.

[0038] The water passage 41d allows the water supply inlet 12 and the water supply outlet 13, and the return water inlet 14 and the water supply outlet 13 to be interconnected, while the shielding portion 41c is used to shield the water supply inlet 12, the water supply outlet 13 and / or the return water inlet 14, so that the valve core 4 switches between the three working states of the water-off position (the water supply inlet 12 is completely blocked), the direct water supply position (the return water inlet 14 is completely blocked) and the mixed water supply position (the return water inlet 14 is partially blocked or not blocked). In the mixed water supply position, the return water inlet 14 and the water supply outlet 13 are interconnected. Since the water supply outlet 13 and the return water inlet 14 are arranged at an interval of 180°, in order to ensure that the water passage 41d has a larger circumferential opening, the shielding portion 41c in this embodiment has a fan-shaped cross section, and the central angle of the fan-shaped cross section is not greater than 90 degrees.

[0039] The fan-shaped shielding portion 41c with a central angle of not more than 90 degrees makes the water channel 41d in a swirling state, which is not conducive to the low-temperature water flowing from the return water inlet 14 to the water supply outlet 13. Figure 3 and Figure 4 As shown, in this embodiment, the vertex of the shielding portion 41c is deviated from the central axis of the columnar body 41 to the side facing away from the water channel 41d, so that the shielding portion 41c is not exactly on the central axis of the return water inlet 14 and the water supply outlet 13; at the same time, the vertex of the fan-shaped shielding portion 41c is cut off and a first drainage surface 41f is formed at the original vertex position; in this way, the obstruction of the shielding portion 41c to the water flow from the return water inlet 14 to the water supply outlet 13 can be reduced.

[0040] like Figure 3 As shown, the first guide surface 41f is connected to the outer arc surface 41h of the shielding portion 41c through the concave arc guide surface 41g. The water flowing into the water trough 41d from the return water inlet 14 will flow along the arc guide surface 41g, the first guide surface 41f, and the arc guide surface 41g to the water supply outlet 13 in sequence, and the guide effect is good.

[0041] like Figure 1 and Figure 3 As shown, on the valve body 1 of this embodiment, the opening of the water supply inlet 12 is circular, while the shapes of the water supply outlet 13 and the return water inlet 14 are different from the water supply inlet 12. Specifically, in the circumferential direction of the valve cavity 11, the openings of the water supply outlet 13 and the return water inlet 14 are larger; and in the axial direction of the valve cavity 11, the openings of the water supply outlet 13 and the return water inlet 14 are smaller. In this way, when adjusting the mixed water temperature, the valve core 4 has a larger rotation angle at the water supply outlet 13 and the return water inlet 14, so that the adjustment accuracy of the mixed water temperature is higher.

[0042] Depend on Figure 2 and Figure 4As shown, in this embodiment, the openings of the water supply outlet 13 and the return water inlet 14 are both hexagonal. On the circumference of the valve cavity 11, a second drainage surface 19 is provided at the vertex of the hexagonal opening, and the second drainage surface 19 is respectively connected to the two surfaces 20 forming the vertex. Since the distance between the two vertexes on the circumference of the valve cavity 11 is the largest, the space at the vertex is relatively small; when the water flows out of the valve cavity 11, it is very easy to form a vortex at the vertex. The second drainage surface 19 formed by cutting off the vertex is conducive to eliminating the vortex and maintaining the stability of the water flow.

[0043] The working principle of an automatic regulating reflux three-way valve in this embodiment is as follows:

[0044] When the blocking portion 41c of the valve core 4 completely blocks the water supply inlet 12, there is no water outflow from the water supply outlet 13 and no water return from the return water inlet 14, then the three-way valve is closed and no water is supplied; when the blocking portion 41c completely blocks the return water inlet 14, all the high-temperature water that flows into the valve cavity 11 from the water supply inlet 12 flows out from the water supply outlet 13 for heating the user; when the heating temperature is too high, the valve core 4 rotates to release the complete blocking of the return water inlet 14, allowing low-temperature water to enter the valve cavity 11 and flow out from the water supply outlet 13, thereby achieving the purpose of mixing water and lowering the heating temperature; according to the degree of reduction in the heating temperature, the degree of blocking of the return water inlet 14 by the valve core 4 is adjusted by rotating the valve core 4, and the return amount of low-temperature water is controlled, thereby achieving precise adjustment of the heating temperature.

[0045] Example 2

[0046] like Figure 6 As shown, the present embodiment is a water mixing center with automatic adjustment of reflux, comprising a water mixer 100, which is the automatic adjustment reflux three-way valve of Embodiment 1, wherein the water supply inlet 12 of the water mixer 100 is connected to the heating network 200, and the water supply outlet 13 is connected to the water distributor 300, and the water distributor 300 is connected to the water collector 500 through a plurality of water distribution pipes 400, and each water distribution pipe 400 is laid in each user's room; the water outlet end of the water collector 500 is respectively connected to the heating network 200 and the return water inlet 14 of the water mixer 100 through the return water tee 600.

[0047] The water outlet of the water collector 500 is also provided with a temperature sensor 700 for detecting the return water temperature. A driving mechanism (not shown in the figure) connected to the rotating shaft 42 is installed on the valve cover 2 of the water mixer 100. The driving mechanism and the temperature sensor 700 are both connected to a controller (not shown in the figure). The controller is used to receive the output signal of the temperature sensor 700, and send instructions to the driving mechanism according to the output signal, so as to drive the valve core 4 to rotate and adjust the position of the shielding portion 41c.

[0048] The working principle of a water mixing center for automatically adjusting reflux in this embodiment is as follows:

[0049] When heating starts, all high-temperature water enters the water distributor 300, and the water mixer 100 is at the direct water supply position. When the return water temperature detected by the temperature sensor 700 is below the threshold, the return water inlet 14 is not opened, and all low-temperature water returns to the heating network 200. When the temperature sensor 700 detects that the return water temperature is higher than the threshold, the controller starts the driving mechanism to drive the water mixer 100 to switch from the direct water supply position to the mixed water supply position, open the return water inlet 14, and the low-temperature water enters the water mixer 100 for mixing, thereby reducing the temperature of the water flow entering the water distributor 300.

Claims

1. An automatic regulating reflux three-way valve, comprising a valve body (1) having a valve chamber (11) therein, characterized in that: The valve body (1) is provided with a water supply inlet (12), a water supply outlet (13) and a return water inlet (14) which are connected to the valve cavity (11); the water supply outlet (13), the water supply inlet (12) and the return water inlet (14) are sequentially arranged at intervals of 90° around the valve body (1); A valve core (4) is rotatably mounted in the valve cavity (11), and the valve core (4) is in sealing cooperation with the inner wall of the valve cavity (11); the valve core (4) has a direct water supply level that completely blocks the return water inlet (14), a mixed water supply level that partially or not blocks the return water inlet (14), and a water shut-off level that completely blocks the water supply inlet (12); The valve cavity (11) is cylindrical, and the valve core (4) comprises a columnar body (41) that slides and seals with the inner wall of the valve cavity (11), and a water supply flow channel connecting the water supply inlet (12) and the water supply outlet (13) and a water mixing flow channel connecting the return water inlet (14) and the water supply outlet (13) are formed on the columnar body (41); The columnar body (41) comprises a disc-shaped upper sealing end (41a) and a lower sealing end (41b), and a shielding portion (41c) connecting the upper sealing end (41a) and the lower sealing end (41b); the upper sealing end (41a), the lower sealing end (41b) and the shielding portion (41c) form a water channel (41d); and the water supply flow channel and the water mixing flow channel are both located in the water channel (41d); The shielding portion (41c) has a fan-shaped cross section, and the central angle of the fan-shaped cross section is not greater than 90 degrees; The apex of the shielding portion (41c) deviates from the central axis of the columnar body (41) toward a side facing away from the water channel (41d); A first drainage surface (41f) is provided at the vertex of the shielding portion (41c), and the first drainage surface (41f) is connected to the outer arc surface (41h) of the shielding portion (41c) via an inwardly concave arc-shaped flow-guiding surface (41g).

2. The automatic regulating reflux three-way valve according to claim 1, characterized in that: In the circumferential direction of the valve cavity (11), the openings of the water supply outlet (13) and the return water inlet (14) are relatively large; in the axial direction of the valve cavity (11), the openings of the water supply outlet (13) and the return water inlet (14) are relatively small.

3. The automatic regulating reflux three-way valve according to claim 2, characterized in that: The openings of the water supply outlet (13) and the water return inlet (14) are both hexagonal, and in the circumferential direction of the valve chamber (11), a second drainage surface (19) is provided at the vertex of the hexagonal opening, and the second drainage surface (19) is respectively connected to the two surfaces forming the vertex.

4. The automatic regulating reflux three-way valve according to any one of claims 1 to 3, characterized in that: It also comprises a valve cover (2) sealedly connected to the valve body (1), the valve core (4) having a rotating shaft (42) extending outside the valve body (1), the valve cover (2) being provided with a through hole (22) for the rotating shaft (42) to pass through, and a driving mechanism for driving the rotating shaft (42) to rotate being fixedly mounted on the valve cover (2).

5. A water mixing center with automatic backflow regulation, comprising a water mixer (100), a water distributor (300) and a water collector (500), wherein the water distributor (300) is connected to a water supply outlet (13) of the water mixer (100), and the water outlet of the water collector (500) is respectively connected to a heating network (200) and a water return inlet (14) of the water mixer (100) via a water return tee (600); It is characterized in that The water mixer (100) is an automatic regulating reflux three-way valve as claimed in any one of claims 1 to 4, a temperature sensor (700) for detecting return water temperature is provided at the water outlet of the water collector (500), a rotating shaft (42) in the automatic regulating reflux three-way valve is connected to a driving mechanism, and the driving mechanism and the temperature sensor (700) are both connected to a controller.

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