CN217541102U - Water supply system - Google Patents

Abstract

The utility model provides a water supply system. The water supply system comprises a water heater, a water supply pipe, a water return pipe and a drainage component, wherein the water heater comprises a water heater body, a main pipeline, a heater and a water pump; the water supply pipe comprises a main water supply pipe and a branch water supply pipe which are communicated with each other; the water return pipe is communicated with the main pipeline and the water supply main pipeline; the drainage component comprises a drainage valve, the drainage valve is arranged at the joint of the water return pipe and the main pipeline, and the water return pipe is communicated with the external atmosphere when the drainage valve is opened; the water supply branch pipe returns residual water to the water return pipe when the drain valve is opened, and the water pump sends residual water in the water return pipe to the heater for heating and outputs the residual water to the water supply main pipe when the drain valve is closed. The utility model can not generate large uneven hot water temperature when the water supply system uses water, and the bathing water temperature is more comfortable.

Description

Water supply system

Technical Field

The utility model relates to the technical field of household appliances, in particular to water supply system.

Background

The water heater is a device which can increase the temperature of cold water into hot water in a certain time by various physical principles.

With the improvement of living standard of people, the zero-cold water gas water heater becomes an industrial trend of the water heater because the zero-cold water gas water heater can realize the instant use of hot water. The zero cold water is a technology that when the water heater is used, cold water is pumped into a main pipeline of the water heater to be circularly heated, and then heated hot water is released, so that a user is prevented from flowing out a large amount of cold water when the water heater is started.

In a specific application, the preheated water usually flows through the water supply main pipe, the water return pipe and the main pipeline and then returns to the water supply main pipe to realize circulation, however, because one end of the water supply branch pipe is closed, the other end of the water supply branch pipe is communicated with the water supply main pipe, and because of reasons such as water pressure, the water stored in the water supply branch pipe cannot be discharged to the water supply main pipe during preheating, that is, the circularly preheated hot water cannot flow into the water supply branch pipe, and therefore, in the preheating process, the water stored in the water supply branch pipe does not participate in the circular preheating. When the preheating is finished and the hot water faucet is opened (or the water point can be weighed), the water temperature of the water supply branch pipe is not heated, so that cold stored water which is not heated in the water supply branch pipe can be mixed with the preheated hot water of the water supply main pipe to form a section of warm water with the temperature lower than the preset temperature, the phenomenon of unstable water temperature is caused after the hot water faucet is opened, the longer the water supply branch pipe is, the larger the water supply air pressure is, the more cold water rushing into the water supply main pipe is, the more unstable water temperature is, and the comfort of the bath water temperature is directly influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a water supply system for make the temperature stable, promote the travelling comfort of bathing.

The above object of the present invention can be achieved by the following technical solutions:

the utility model provides a water supply system, include:

the water heater comprises a water heater body, a main pipeline, a heater and a water pump, wherein the main pipeline is arranged on the water heater body, and the heater and the water pump are arranged on the main pipeline;

a water supply pipe including a main water supply pipe and a branch water supply pipe which are communicated with each other;

the water return pipe is communicated with the main pipeline and the water supply main pipeline;

the drainage component comprises a drainage valve, the drainage valve is arranged at the joint of the water return pipe and the main pipeline, and the water return pipe is communicated with the external atmosphere when the drainage valve is opened;

the water supply branch pipe returns residual water to the water return pipe when the drain valve is opened, and the water pump sends residual water in the water return pipe to the heater for heating and outputs the residual water to the water supply main pipe when the drain valve is closed.

The utility model discloses an among the embodiment, the outlet has been seted up with the junction of main line to the wet return, and the wet return passes through outlet intercommunication outside atmosphere when the drain valve is opened, and the position of outlet is less than water supply branch's peak, and the atmospheric pressure that the position of outlet was configured into the outlet is less than the water pressure in the water supply branch.

The utility model discloses an among the embodiment, the position of outlet is greater than the water supply and is responsible for the junction with the water supply branch pipe, and the position of outlet is configured to the atmospheric pressure of outlet and is greater than or equal to the water pressure of the junction that the water supply is responsible for and is responsible for with the water supply branch pipe.

The utility model discloses an in the embodiment, the drain part sets up on the water heater body to be located drain department.

In the embodiment of the utility model, the device also comprises a water inlet valve which is arranged at the water inlet of the main pipeline, the water inlet is used for connecting with a tap water pipeline, and the water inlet valve is used for opening or closing the water inlet;

the water supply branch pipe returns residual water to the water return pipe when the drain valve is opened and the water inlet valve is closed, and the water pump sends the residual water in the water return pipe to the heater for heating and outputting the residual water to the water supply main pipe when the drain valve is closed and the water inlet valve is closed.

The utility model discloses an among the embodiment, drain valve and water intaking valve are the solenoid valve, and the controller of water heater electric connection heater, drain valve and water intaking valve respectively.

The water pressure sensor is electrically connected with the controller and is used for detecting the water pressure in the water supply main pipe, the water supply branch pipe and/or the water return pipe; wherein the content of the first and second substances,

the controller opens the drain valve and closes the water inlet valve under the condition that the water pressure sensor detects that the water pressure in the water supply main pipe, the water supply branch pipe and/or the water return pipe is larger than or equal to a preset value, so that the water supply branch pipe returns residual water in the water supply branch pipe to the water return pipe;

and the controller closes the drain valve and closes the water inlet valve when the water pressure sensor detects that the water pressure in the water supply main pipe, the water supply branch pipe and/or the water return pipe is less than a preset value, so that the water pump sends the residual water in the water return pipe to the heater for heating and outputs the residual water to the water supply main pipe.

The utility model discloses an among the embodiment, still include the check valve, set up between outlet and the water inlet of intaking, the check valve is used for making the outlet towards the water inlet of intaking one-way conduction.

The utility model discloses an among the embodiment, still include the bypass pipe, the wet return is linked together through bypass pipe and main line, and drain valve and check valve all set up on the bypass pipe, and outlet and water inlet all set up on the bypass pipe.

The utility model discloses an among the embodiment, still include rivers induction system, set up on the main line to with controller electric connection, rivers induction system is used for detecting the discharge of main line, and the heater is opened to the controller under the state that rivers induction system detected the discharge of main line, and the controller closes the heater under the state that rivers induction system did not detect the discharge of main line.

The utility model discloses a characteristics and advantage are:

the utility model discloses a water supply system, the current mode of preheating has been improved, make the wet return can communicate outside atmosphere, because the water pressure in the wet return is greater than outside atmospheric pressure, therefore, discharge from the wet return earlier before preheating through making partly water in the wet return, because wet return and delivery pipe are linked together, therefore, when the water in the wet return is discharged, water in the delivery pipe (water supply is responsible for and water supply branch) also can follow the quilt and discharge, therefore, the water of water supply branch can reduce and do not exist even, the event is closed the drain valve and is circulated through water pump and heater and preheated again, make remaining water (not discharged and stay the water of wet return and delivery pipe) all heated basically, in concrete application, for example, when opening the hot water tap with water supply branch intercommunication, the remaining water that participates in circulation preheating can be pressed into the branch under the effect of the water of running water pipeline gushing into the water of water supply pipeline, therefore, the water that comes out from the hot water tap of water supply branch is the circulation heating is the water heating through the water temperature of circulation heating, therefore, the utility model discloses a more practical hot water supply branch is more practical more is got out from the water supply branch.

Drawings

The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.

FIG. 1 is a schematic view of a water supply system of the present invention;

fig. 2 is a schematic view of the water supply system of the present invention in a pressure relief state;

fig. 3 is a schematic view of the water supply system of the present invention in a preheating state;

fig. 4 is a schematic view of the water supply system of the present invention in a standby mode;

fig. 5 is a schematic view of the water supply system according to the present invention in a use state.

Reference numerals and description:

1. a water heater; 11. a water heater main body; 12. a main pipeline; 13. a heater; 14. a water pump; 15. a controller;

2. a water supply pipe; 21. a water supply main pipe; 22. a water supply branch pipe; 221. a branch pipe for bathing; 222. a kitchen branch pipe;

3. a water return pipe;

4. a drainage member; 41. a drain valve;

5. a water inlet valve;

6. a one-way valve;

7. a bypass pipe; 71. a water outlet; 72. a water inlet;

8. a water flow sensing device;

9. an effluent temperature sensor;

10. a backwater temperature sensor;

101. an operation display; 1011. a preheat bond;

102. and (4) guiding the rubber tube.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed description will be omitted.

The terms "a", "an", "the", "said" are used to indicate the presence of one or more elements/components/etc.; the terms "comprising" and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. other than the listed elements/components/etc.

As shown in fig. 1 to 5, the present invention provides a water supply system, which comprises a water heater 1, a water supply pipe 2, a water return pipe 3 and a water discharge component 4, wherein the water heater 1 comprises a water heater main body 11, a main pipeline 12, a heater 13 and a water pump 14, the main pipeline 12 is arranged on the water heater main body 11, and the heater 13 and the water pump 14 are both arranged on the main pipeline 12; the water supply pipe 2 includes a main water supply pipe 21 and a branch water supply pipe 22 which are communicated with each other; the water return pipe 3 is communicated with the main pipeline 12 and the water supply main pipeline 21; the water discharge part 4 comprises a water discharge valve 41, the water discharge valve 41 is arranged at the connection part of the water return pipe 3 and the main pipeline 12, and the water return pipe 3 is communicated with the external atmosphere when the water discharge valve 41 is opened; the water supply branch pipe 22 returns the water remaining in the water return pipe 3 to the water return pipe 3 when the drain valve 41 is opened, and the water pump 14 supplies the water remaining in the water return pipe 3 to the heater 13 to be heated and outputs the water to the water supply main pipe 21 when the drain valve 41 is closed.

The utility model discloses a water supply system, the current mode of preheating has been improved, make wet return 3 can communicate outside atmosphere, because the water pressure in wet return 3 is greater than outside atmospheric pressure, therefore, as shown in fig. 2, discharge from wet return 3 earlier before preheating through making some water in wet return 3, because wet return 3 and delivery pipe 2 are linked together, therefore, when the water in wet return 3 is discharged, the water in delivery pipe 2 (the bathing is responsible for 21 and delivery pipe 22) also can follow and is discharged, therefore, as shown in fig. 3, the water of water supply branch 22 can reduce or even do not exist, so close drain valve 41 and circulate through water pump 14 and heater 13 and preheat again, make the remaining water (not discharged and stay in wet return 3 and delivery pipe 2's water) also basically by the heating, in specific application, as shown in fig. 4 and fig. 5, for example, when opening the hot water tap that communicates with water supply branch 22, the remaining water of temperature of participation circulation preheating is also heated under the effect of the water of water piping water of water inflow main pipeline 12, also be heated by the effect of water pressure, the hot water supply branch is comparatively more practical water supply branch is heated by the hot water supply branch, therefore, the hot water branch 22 is more than the hot water supply branch is heated circulation is from the hot water supply branch 22, the hot water supply branch is more than the utility model, thereby, the hot water supply branch is more convenient, the hot water supply branch is more, the utility model, the hot water supply branch is more convenient.

Specifically, a water outlet 71 is formed at the connection position of the water return pipe 3 and the main pipeline 12, the water return pipe 3 is communicated with the outside atmosphere through the water outlet 71 when the drain valve 41 is opened, the position of the water outlet 71 is smaller than the highest point of the water supply branch pipe 22, and the position of the water outlet 71 is configured such that the atmospheric pressure of the water outlet 71 is smaller than the water pressure in the water supply branch pipe 22, so that the water in the water return pipe 3 can be discharged without using additional liquid conveying equipment such as a water pump 14, and the water in the water supply branch pipe 22 is discharged, and the structure is simple and the cost is low.

More specifically, the position of the water outlet 71 is greater than the joint between the main water supply pipe 21 and the branch water supply pipe 22, and the position of the water outlet 71 is configured such that the atmospheric pressure of the water outlet 71 is greater than or equal to the water pressure at the joint between the main water supply pipe 21 and the branch water supply pipe 22, and through the above-mentioned structural arrangement, the internal and external pressure can be equalized, thereby, the water discharge of the main water supply pipe 21 itself can be avoided, that is, only the water of the branch water supply pipe 22 can be discharged, so as to reduce the waste of water resources, and in a specific application, if the water in the main water supply pipe 21 is not filled up, the technical problem that the water at the water taking point such as a hot water faucet or a shower head intermittently flows out or even is sprayed out exists in the using process, which affects the user experience.

The utility model discloses an in the embodiment, drainage component 4 sets up on water heater main part 11 to be located outlet 71 department, through the setting of above-mentioned structure, can make drainage component 4 connect on water heater main part 11, from this, be convenient for production, processing, installation and maintenance of registering one's residence.

Specifically, in a specific application, the water supply branch pipes 22 are usually plural, and two water supply branch pipes 22 are taken as an example, and for convenience of description, the two water supply branch pipes 22 are respectively configured as a shower branch pipe 221 and a kitchen branch pipe 222. In the prior art, if the water discharge part 4 is not provided, because the upper ends of the water supply branch pipes 22 are all closed, and the lower ends of the water supply branch pipes 22 are communicated with the water supply main pipe 21, the stored water of the water supply branch pipes 22 cannot be discharged during preheating due to reasons such as water pressure difference, so that the circulating hot water cannot flow into the water supply branch pipes 22, and the stored water of the water supply branch pipes 22 does not participate in circulating preheating during preheating. When the shower head (or the measurable water point) of the branch pipe 221 for taking a shower is opened after the preheating is finished, the water which is not circularly heated in the branch pipe 22 for supplying water is firstly sprayed, the water which is not circularly heated in the branch pipe 222 for kitchen is mixed with the water which is circularly heated in the main pipe 21 for supplying water, and a section of water with unstable water temperature is formed. In one embodiment, a check valve for guiding the water supply main pipe 21 toward the water supply branch pipe 22 may be provided at a lower end of the kitchen branch pipe 222, that is, the water of the kitchen branch pipe 222 may not flow from the lower end toward the upper end, thereby preventing the non-circularly heated water in the kitchen branch pipe 222 from being mixed with the circularly heated water in the water supply main pipe 21. Further, if there are three water supply branch pipes 22, a check valve may be disposed at each of the lower ends of the two water supply branch pipes 22 close to the water heater 1; if the number of the water supply branch pipes 22 is four, a check valve may be disposed at each of the lower ends of the three water supply branch pipes 22 adjacent to the water heater 1. Compared with the structure, the utility model arranges the water discharging component 4 on the water heater main body 11 and is positioned at the water outlet 71, and one or more one-way valves are not needed to be arranged at the lower end of the water supply branch pipe 22, thus the cost is lower; and, since the water supply branch pipe 22 is usually buried in the wall body, it is convenient to maintain, it is not necessary to detach the wall tiles, the wall body is damaged, and maintainability and maintenance efficiency are improved.

In an embodiment of the present invention, the water inlet valve 5 is further included and is disposed at the water inlet 72 of the main pipeline 12, the water inlet 72 is used for connecting to a tap water pipeline, and the water inlet valve 5 is used for opening or closing the water inlet 72; the water supply branch pipe 22 returns the residual water to the water return pipe 3 when the drain valve 41 is opened and the water inlet valve 5 is closed, so that the water in the water return pipe 3 is discharged only through the drain valve 41, the water pump 14 heats the residual water in the water return pipe 3 by the heater 13 and outputs the heated water to the water supply main pipe 21 when the drain valve 41 is closed and the water inlet valve 5 is closed, and therefore, the water in the tap water pipe does not participate in the circulation heating, the residual water is not discharged through the drain valve 41, the water resource can be saved, and the water quantity of the circularly heated water is fixed, so that the water is not pressed into the water supply branch pipe 22 and changed into cold water under the action of the water pressure.

Further, the drain valve 41 and the inlet valve 5 are both solenoid valves, and the controller 15 of the water heater 1 is electrically connected with the heater 13, the drain valve 41 and the inlet valve 5 respectively, so that the control is facilitated through the structural arrangement, and the manual operation of a user is not needed.

Furthermore, the water pressure sensor is electrically connected with the controller 15 and is used for detecting the water pressure in the water supply main pipe 21, the water supply branch pipe 22 and/or the water return pipe 3; wherein, the controller 15 opens the drain valve 41 and closes the water inlet valve 5 in a state that the water pressure sensor detects that the water pressure in the water supply main pipe 21, the water supply branch pipe 22 and/or the water return pipe 3 is greater than or equal to a preset value, so that the water supply branch pipe 22 returns the residual water therein to the water return pipe 3; the controller 15 detects the state that the water pressure in water supply main pipe 21, water supply branch pipe 22 and/or wet return 3 is less than the default at water pressure sensor and closes drain valve 41 and close water intaking valve 5, makes water pump 14 send remaining water to heater 13 heating and output to water supply main pipe 21 in with wet return 3, because water supply branch pipe 22 does not participate in the circulation and preheats mainly that water supply branch pipe 22's water pressure is less than water supply main pipe 21's water pressure, so water supply branch pipe 22's water can not flow into water supply main pipe 21, the utility model discloses the water flow direction between water supply branch pipe 22 and the delivery pipe 2 is confirmed to the hydraulic change of accessible, opens or closes drain valve 41 in real time according to hydraulic change, realizes accurate drainage pressure release, not only reducible water pressure influence because of water supply branch pipe 22, but also can reduce the waste of water resource.

Specifically, still include rivers induction system 8, set up on main pipeline 12 to with controller 15 electric connection, rivers induction system 8 is used for detecting the discharge of main pipeline 12, controller 15 opens heater 13 under the state that rivers induction system 8 detected the discharge of main pipeline 12, controller 15 does not close heater 13 under the state that rivers induction system 8 detected the discharge of main pipeline 12, from this, not only can prevent that heater 13 from burning futilely, but also can the energy saving.

In concrete application, if link to each other drain valve 41 with water supply branch pipe 22, then drain valve 41 (solenoid valve) not only exists far away with controller 15 distance, the two technical problem of being connected of being not convenient for, but also has the mistake and touches rivers induction system 8 and lead to heater 13 to be opened by the mistake, causes the technical problem that main line 12 burns futilely, the utility model discloses set up drain valve 41 in the junction of wet return 3 with main line 12, at drainage pressure release in-process, the water in the delivery pipe 2 gushes earlier to wet return 3, is discharged by drain valve 41 again, can hardly flow through the rivers induction system 8 in the water heater main part 11.

In one embodiment, a guide hose 102 may be further included, which may be connected to the water discharge opening 71 at an upper end thereof and may be communicated with the sewage at a lower end thereof, so that the water discharged from the water discharge opening 71 is directly introduced into the sewage, and the water pressure of the return pipe 3 and the water supply branch pipe 22 may be reduced to approximately zero water pressure.

Furthermore, the system also comprises an outlet water temperature sensor 9 (or a water outlet temperature probe), a return water temperature sensor 10 (or a water return temperature probe) and an operation display 101, wherein the outlet water temperature probe is arranged close to the outlet end of the main pipeline 12 and is electrically connected with the controller 15; the backwater temperature probe is arranged close to the water inlet end of the main pipeline 12 and is electrically connected with the controller 15; the operation display 101 is disposed on the water heater main body 11 and electrically connected to the controller 15, and the operation display 101 is provided with a preheating key 1011 for turning on a preheating function.

The utility model discloses an in an embodiment, still include check valve 6, set up between outlet 71 and the water inlet 72 of intaking, check valve 6 is used for making outlet 71 towards the one-way conduction of water inlet 72, from this, when water intaking valve 5 was opened, in the running water that gets into through water inlet 72 can directly flow into water heater 1, the running water that changes the entering can not follow outlet 71 and flow out, from this, can further reduce the waste of water resource.

Further, the device also comprises a bypass pipe 7, the bypass pipe 7 can be a four-way pipe, the return pipe 3 is communicated with the main pipeline 12 through the bypass pipe 7, the drain valve 41 and the one-way valve 6 are both arranged on the bypass pipe 7, the drain port 71 and the water inlet 72 are both arranged on the bypass pipe 7, namely, one of four ports of the four-way pipe can be connected with the main pipeline 12, one can be the drain port 71, one can be the water inlet 72, and one can be connected with the other end of the return pipe 3,

the working process is as follows:

clicking a preheat key 1011 on the operation display 101 to start a preheat function;

as shown in fig. 2, the water may be drained and depressurized first, that is, the controller 15 may close the water inlet valve 5 and open the water drain valve 41, so that the water return pipe 3 communicates with the external atmosphere, so as to drain the water from the water supply branch pipe 22 through the water return pipe 3;

as shown in fig. 3, when the pressure relief time (for example, 5 seconds to 10 seconds) is reached, the controller 15 closes the drain valve 41, and opens the water pump 14 and the heater 13, so that the water remaining in the return pipe 3 is sent to the heater 13 to be heated and then discharged to the water supply main pipe 21 for cyclic preheating;

as shown in fig. 4, when the water temperature of the return pipe 3 is greater than or equal to the preset water temperature, and/or when the on time of the heater 13 is greater than the preset time, the water pump 14 and the heater 13 are turned off, the preheating function is completed, and the standby mode is entered;

as shown in fig. 5, when the hot water tap of the water branch pipe 22 is opened, the controller 15 opens the water inlet valve 5, and the tap water flowing from the water inlet 72 presses the water of the water main pipe 21 into the water branch pipe 22 to flow out of the hot water tap.

To sum up, the utility model discloses a water supply system has following effect:

because the water is heated for the water of depositing in the upper portion of water supply branch pipe 22, and cold water among the non-prior art, therefore the temperature fluctuation of the water that hot tap flows is little or undulant basically, and the mode of preheating is compared with the zero cold water of conventionality, the utility model discloses a water supply system can not appear the uneven phenomenon of hot water temperature by a wide margin when terminal (can weigh the water spot) water, and the bathing temperature is more comfortable.

In the embodiments of the present invention, the term "plurality" means two or more unless explicitly defined otherwise. The terms "mounted," "fixed," "connected," and the like are to be construed broadly and include, for example, fixed connections, removable connections, and integral connections. The specific meaning of the above terms in the embodiments of the present invention can be understood by those skilled in the art according to specific situations.

In the description of the embodiments of the present invention, it should be understood that the terms "upper" and "lower" are used for indicating the position or the positional relationship based on the position or the positional relationship shown in the drawings, and are only for convenience of describing the embodiments of the present invention and simplifying the description, but not for indicating or implying that the indicated device or unit must have a specific direction, be constructed and operated in a specific position, and thus, should not be construed as limiting the embodiments of the present invention.

In the description herein, the description of the terms "one embodiment," "a preferred embodiment," etc. means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the embodiments of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made to the embodiment of the present invention by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the embodiments of the present invention should be included in the protection scope of the embodiments of the present invention.

Claims (10)

1. A water supply system, comprising:

the water heater comprises a water heater body (11), a main pipeline (12), a heater (13) and a water pump (14), wherein the main pipeline (12) is arranged on the water heater body (11), and the heater (13) and the water pump (14) are both arranged on the main pipeline (12);

a water supply pipe (2) including a main water supply pipe (21) and a branch water supply pipe (22) which are communicated with each other;

a return pipe (3) communicating the main pipe (12) and the main water supply pipe (21);

a drainage part (4) including a drainage valve (41), the drainage valve (41) being disposed at a connection of the return pipe (3) and the main pipeline (12), the return pipe (3) being communicated with the outside atmosphere when the drainage valve (41) is opened;

the water supply branch pipe (22) returns residual water to the water return pipe (3) when the drain valve (41) is opened, and the water pump (14) sends residual water in the water return pipe (3) to the heater (13) to be heated and outputs the residual water to the water supply main pipe (21) when the drain valve (41) is closed.

2. The water supply system of claim 1,

a water outlet (71) is formed in the connection position of the water return pipe (3) and the main pipeline (12), the water return pipe (3) is communicated with the outside atmosphere through the water outlet (71) when the drain valve (41) is opened, the position of the water outlet (71) is smaller than the highest point of the water supply branch pipe (22), and the position of the water outlet (71) is configured in such a way that the atmospheric pressure of the water outlet (71) is smaller than the water pressure in the water supply branch pipe (22).

3. Water supply system according to claim 2,

the position of the water outlet (71) is larger than the joint of the main water supply pipe (21) and the branch water supply pipe (22), and the position of the water outlet (71) is configured in such a way that the atmospheric pressure of the water outlet (71) is larger than or equal to the water pressure of the joint of the main water supply pipe (21) and the branch water supply pipe (22).

4. Water supply system according to claim 2,

the drainage component (4) is arranged on the water heater main body (11) and is positioned at the drainage port (71).

5. Water supply system according to claim 2,

further comprising a water inlet valve (5) arranged at a water inlet (72) of the main pipeline (12), the water inlet (72) being used for connecting a tap water pipeline, the water inlet valve (5) being used for opening or closing the water inlet (72);

the water supply branch pipe (22) returns the residual water to the water return pipe (3) when the drain valve (41) is opened and the water inlet valve (5) is closed, and the water pump (14) sends the residual water in the water return pipe (3) to the heater (13) to be heated and outputs the residual water to the water supply main pipe (21) when the drain valve (41) is closed and the water inlet valve (5) is closed.

6. The water supply system of claim 5,

the drain valve (41) and the water inlet valve (5) are both electromagnetic valves, and the controller (15) of the water heater (1) is respectively and electrically connected with the heater (13), the drain valve (41) and the water inlet valve (5).

7. The water supply system of claim 6,

the water pressure sensor is electrically connected with the controller (15) and is used for detecting the water pressure in the water supply main pipe (21), the water supply branch pipe (22) and/or the water return pipe (3); wherein the content of the first and second substances,

the controller (15) opens the drain valve (41) and closes the water inlet valve (5) when the water pressure sensor detects that the water pressure in the main water supply pipe (21), the branch water supply pipe (22) and/or the water return pipe (3) is greater than or equal to a preset value, so that the branch water supply pipe (22) returns the residual water to the water return pipe (3);

the controller (15) closes the drain valve (41) and closes the water inlet valve (5) when the water pressure sensor detects that the water pressure in the water supply main pipe (21), the water supply branch pipe (22) and/or the water return pipe (3) is smaller than the preset value, so that the water pump (14) sends the residual water in the water return pipe (3) to the heater (13) for heating and outputting to the water supply main pipe (21).

8. Water supply system according to claim 7,

the water inlet and outlet device further comprises a one-way valve (6) arranged between the water outlet (71) and the water inlet and outlet (72), and the one-way valve (6) is used for enabling the water outlet (71) to conduct towards the water inlet and outlet (72) in a one-way mode.

9. Water supply system according to claim 8,

the water return pipe (3) is communicated with the main pipeline (12) through the bypass pipe (7), the drain valve (41) and the one-way valve (6) are arranged on the bypass pipe (7), and the drain port (71) and the water inlet (72) are arranged on the bypass pipe (7).

10. Water supply system according to claim 6,

the water heater is characterized by further comprising a water flow sensing device (8) arranged on the main pipeline (12) and electrically connected with the controller (15), wherein the water flow sensing device (8) is used for detecting the water flow of the main pipeline (12), the heater (13) is turned on by the controller (15) in a state that the water flow sensing device (8) detects the water flow of the main pipeline (12), and the heater (13) is turned off by the controller (15) in a state that the water flow sensing device (8) does not detect the water flow of the main pipeline (12).

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