CN114198526A

CN114198526A - Water return valve, water supply system without water return pipe, water supply system with water return pipe and water heater

Info

Publication number: CN114198526A
Application number: CN202111268737.8A
Authority: CN
Inventors: 巴喜亮; 梁国荣
Original assignee: Midea Group Co Ltd; Wuhu Midea Kitchen and Bath Appliances Manufacturing Co Ltd
Current assignee: Midea Group Co Ltd; Wuhu Midea Kitchen and Bath Appliances Manufacturing Co Ltd
Priority date: 2021-10-29
Filing date: 2021-10-29
Publication date: 2022-03-18
Anticipated expiration: 2041-10-29
Also published as: CN114198526B

Abstract

The invention discloses a water return valve, a water supply system without a water return pipe, a water supply system with a water return pipe and a water heater, wherein the water return valve comprises a valve body and a one-way valve, the valve body comprises four connecting parts with the end parts crossed, the tail ends of the four connecting parts extending towards different directions are opened with a first water inlet and outlet, a second water inlet and outlet, a third water inlet and outlet and a fourth water inlet and outlet, the second water inlet and outlet is always communicated with the third water inlet and outlet, and the first water inlet and outlet is always communicated with the fourth water inlet and outlet. The one-way valve is arranged between the first water inlet and the second water inlet, and when the one-way valve is opened, water in the first water inlet and the second water inlet can flow to the second water inlet and the second water outlet in a one-way mode; when the one-way valve is closed, water in the first water inlet and outlet can flow to the fourth water inlet and outlet, and water in the second water inlet and outlet can flow to the third water inlet and outlet. The water return valve provided by the embodiment of the invention has the advantages that the structure is simple and small, the water inlet and outlet forms are various, and the functions of hot water circulation and zero cold water can be realized by opening the one-way valve; when the one-way valve is closed, water is normally used.

Description

Water return valve, water supply system without water return pipe, water supply system with water return pipe and water heater

Technical Field

The invention belongs to the technical field of water heaters, and particularly relates to a water return valve, a water supply system without a water return pipe, a water supply system with a water return pipe and a water heater.

Background

Zero cold water heater can realize opening the function of heating promptly with the water end, promotes convenience and the travelling comfort of user's water use.

In the related art, in a zero-cold-water supply system without a water return pipe, a circulation loop between a zero-cold-water heater and a water using end is realized by installing water return valves, the water return valves are usually arranged close to the water using end, when cold water is used at the water using end, the problem of false start of the zero-cold-water heater is easily caused, and the water return valves are usually complex in structure, large in occupied space and high in installation difficulty.

In a zero-cold-water supply system provided with a water return pipe, a water return valve is arranged close to a zero-cold-water heater, the water return valve is communicated with a water inlet pipe, a cold-water source and the water return pipe, and the water return pipe is connected with a hot-water pipe at a universal water end to form a circulation loop between the zero-cold-water heater and the water end. However, the water return valves have complex structures, large occupied space and insufficient hot water flow.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. To this end, the object of the first aspect of the invention is to provide a water return valve which is compact, easy to manufacture and suitable for use in a zero-cold water supply line.

The second aspect of the invention aims to provide a water supply system without a return pipe, which is provided with the return valve.

The third aspect of the invention aims to provide a water supply system with a water return pipe, which is provided with the water return valve.

The fourth aspect of the invention aims to provide a water heater with the water return valve.

According to an embodiment of the invention, the water return valve comprises: the valve body comprises four connecting ports with the ends meeting, and each connecting port extends towards different directions; the tail ends of the four connecting parts are open and respectively form a first water inlet and outlet, a second water inlet and outlet, a third water inlet and outlet and a fourth water inlet and outlet, the second water inlet and outlet is always communicated with the third water inlet and outlet, and the first water inlet and outlet is always communicated with the fourth water inlet and outlet; the one-way valve is arranged between the first water inlet and outlet and the second water inlet and outlet, and when the one-way valve is opened, water in the first water inlet and outlet can flow to the second water inlet and outlet in a one-way mode; when the one-way valve is closed, water in the first water inlet and outlet can flow to the fourth water inlet and outlet, and water in the second water inlet and outlet can flow to the third water inlet and outlet.

According to the water return valve disclosed by the embodiment of the invention, the whole structure is small, the four connecting parts extending towards different directions can be respectively used for connecting different pipe sections, the pipe sections are not interfered with each other during installation, and the occupied installation space is small during installation. The pipe section connected to the interface part can be communicated with the corresponding water inlet and outlet. When the one-way valve is closed, one of the first water inlet/outlet and the fourth water inlet/outlet which are communicated with each other can be used for water inlet and the other can be used for water outlet, and likewise, one of the second water inlet/outlet and the third water inlet/outlet can be used for water inlet and the other can be used for water outlet, so that water in different connector parts can be communicated and the flow direction can be changed. When the one-way valve is opened, water in the first water inlet and outlet can flow into the second water inlet and outlet, and if the third water inlet and outlet does not discharge water, the second water inlet and outlet can discharge the water flowing in from the first water inlet and outlet outwards; if the third water inlet and outlet is used for water outlet, the second water inlet and outlet can further discharge the water flowing into the first water inlet and outlet towards the third water inlet and outlet, so that various water inlet and outlet modes of the water return valve are realized.

According to the water return valve of the embodiment of the invention, the first axis of the first water inlet and outlet is not parallel to the second axis of the second water inlet and outlet; a second axis of the second water inlet/outlet is coaxially arranged with a fourth axis of the fourth water inlet/outlet; an included angle exists between the first axis and the fourth axis.

According to the water return valve provided by some embodiments of the invention, a first flow passage communicated with the first water inlet and outlet, a second flow passage communicated with the second water inlet and outlet, a third flow passage communicated with the third water inlet and outlet, and a fourth flow passage communicated with the fourth water inlet and outlet are arranged in the valve body; the first flow passage and the fourth flow passage are intersected and communicated, and the second flow passage and the third flow passage are intersected and communicated; the valve body has a water return state and a water using state; the one-way valve is arranged on one side, close to the first flow channel, of the second flow channel, can be switched between a stop position and a flow position, and is closed when the one-way valve is in the stop position, and the one-way valve cuts off the first flow channel and the second flow channel; in the flow position the one-way valve is open, the one-way valve communicating the first flow passage with the second flow passage; when the valve body is switched from the water using state to the water returning state, the one-way valve is switched from the stop position to the circulation position, so that the water in the first flow channel flows into the second flow channel or the third flow channel.

Optionally, the check valve is disposed at a junction of the second flow channel and the third flow channel, when the valve body is in a water use state, the check valve blocks the first flow channel and the second flow channel, and when water flows between the second flow channel and the third flow channel, at least a part of the water passes through the check valve.

Optionally, a communication port of the third flow passage on the second flow passage at least partially overlaps with a valve body of the check valve, and the check valve is opened toward one end of the second water inlet/outlet.

Optionally, the one-way valve includes a blocking portion, an accommodating portion and an elastic member, the elastic member is sleeved between the blocking portion and the accommodating portion, so that the blocking portion is telescopically connected to the accommodating portion, and the accommodating portion is disposed toward the second water inlet and outlet.

Optionally, the maximum cross-sectional dimension of the accommodating part is smaller than that of the blocking part, the one-way valve is half-opened towards one side of the second water inlet and outlet, and water in the second water inlet and outlet can bypass the accommodating part to be communicated with water in the third water inlet and outlet.

According to some embodiments of the invention, the water return valve further comprises a flow stabilizing piece, the flow stabilizing piece is arranged in the interface part provided with the third water inlet and outlet, and the flow stabilizing piece comprises a flow stabilizing core with the flow rate of 6-8L/min.

Optionally, the backwater valve further comprises a blocking cover, and the blocking cover is arranged at the fourth water inlet and outlet.

According to the embodiment of the invention, the water supply system without the return pipe comprises: the water heater comprises a water inlet pipe and a water outlet pipe; the water using end is connected with a hot water using pipe and a cold water using pipe; in the water return valve with the flow stabilizing piece in each embodiment, the fourth water inlet and outlet is communicated with the hot water pipe, and the third water inlet and outlet is communicated with the cold water pipe; the first water inlet and outlet is communicated with the water outlet pipe through a hot water pipe, and the second water inlet and outlet is communicated with the water inlet pipe through a cold water pipe; the cold water source is respectively communicated with the water inlet pipe and the cold water pipe; when the water heater returns water, the one-way valve is opened, and hot water of the water outlet pipe flows from the first water inlet and outlet to the second water inlet and outlet and returns to the water inlet pipe through the cold water pipe.

According to the water supply system without the return pipe, when the water heater returns water, under the driving of relevant parts of the water heater, hot water in the water outlet pipe flows into the first water inlet and outlet through the hot water pipe, water in the fourth water inlet and outlet and water in the third water inlet and outlet do not flow outwards at the moment, the hot water flowing into the first water inlet and outlet can continuously flush towards the second water inlet and outlet, the generated pressure difference can enable the one-way valve to be switched from closing to opening, and the one-way valve is switched from the stop position to the circulation position, so that the hot water further flows back to the water inlet pipe through the cold water pipe through the second water inlet and outlet, a circulation loop is formed, and certain zero cold water storage is realized. When the water using end needs to use water, the water flows from the cold water pipe to the second water inlet and outlet, then flows to the cold water using pipe through the third water inlet and outlet and finally enters the water using end; water also enters the first water inlet and outlet from the hot water pipe, flows to the fourth water inlet and outlet from the first water inlet and outlet, then enters the hot water using pipe, and finally enters the water using end, so that the hot water at the water using end can be used immediately.

According to the embodiment of the invention, the water supply system with the water return pipe comprises: the water heater comprises a water inlet pipe and a water outlet pipe; the water using end is connected with a hot water using pipe and a cold water using pipe, and the hot water using pipe is communicated with the water outlet pipe through a hot water pipe; in the water return valve of the embodiment including the blocking cover, the third water inlet and outlet is communicated with the water inlet pipe, and the first water inlet and outlet is communicated with the hot water pipe through a water return pipe; the cold water source is communicated with the second water inlet and outlet and is communicated with the cold water using pipe through a cold water pipe; when the water heater returns water, the water in the water return pipe flows to the third water inlet and outlet through the first water inlet and outlet.

According to the water supply system with the water return pipe, when the water heater returns water, under the driving of relevant parts of the water heater, hot water in the water outlet pipe enters the hot water pipe, flows into the water return pipe from the hot water pipe, then enters the first water inlet and outlet from the water return pipe, because water in the second water inlet and outlet does not flow outwards at the moment, and the third water inlet and outlet is communicated with the water inlet pipe, pressure difference can be generated among the first water inlet and outlet, the second water inlet and outlet and the third water inlet and outlet, the one-way valve is switched from closed to open, and then the cut-off position is switched to the circulation position, so that the hot water further enters the third water inlet and outlet through the second water inlet and outlet and flows back to the water inlet pipe, a circulation loop is formed, and certain zero cold water storage is realized. When the water using end needs to use water, the hot water with a certain temperature flows into the hot water using pipe from the hot water pipe and finally enters the water using end, so that the hot water at the water using end can be used immediately.

The water heater comprises the embodiment of the water return valve with the blocking cover.

According to the water heater provided by the embodiment of the invention, the water return valve with the blocking cover is arranged on a pipeline close to the water heater or the water return valve with the blocking cover is arranged in the water heater, so that large-flow water return of the water heater with the water return pipe can be realized, the sufficient hot water quantity is ensured, and the hot water can be immediately used after being opened.

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

Drawings

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

FIG. 1 is an exploded view of a water return valve according to some embodiments of the present invention.

FIG. 2 is a cross-sectional view of a water return valve according to some embodiments of the present invention.

Fig. 3 is a partially enlarged structural diagram of a region I in fig. 2.

FIG. 4 is a cross-sectional view of a trap with a cover in accordance with further embodiments of the present invention.

FIG. 5 is a schematic diagram of a water circulation path of a water return valve in a water supply system without a water return pipe according to some embodiments of the invention.

FIG. 6 is a schematic flow diagram illustrating a water return valve in a non-return water system in a water using state, according to some embodiments of the present invention.

FIG. 7 is a schematic diagram of a water circuit of a water return valve in a water supply system with a water return pipe according to some embodiments of the present invention.

FIG. 8 is a schematic illustration of a flow path in a wet return with a wet return valve in a wet return water system according to some embodiments of the present invention.

Reference numerals:

1000. a water return valve;

100. a valve body; 101. an interface section; 110. a first flow passage; 111. a first intersection port; 112. a first water inlet and outlet;

120. a second flow passage; 121. a second intersection port; 122. a second water inlet and outlet; 123. a second rib;

130. a third flow path; 131. a communication port; 132. a third water outlet; 133. a first rib;

140. a fourth flow path; 141. a third intersection port; 142. a fourth water inlet and outlet;

150. a transition chamber;

200. a one-way valve; 210. a plugging section; 211. a connecting rod; 220. a receptacle portion; 230. an elastic member;

300. a fastener; 400. a filter member; 500. a flow stabilizer; 600. blocking the cover;

2100. a water supply system without a return pipe; 2200. a water return pipe water supply system is arranged;

2010. a water heater; 2011. a water inlet pipe; 2012. a water outlet pipe; 2013. driving the pump;

2020. carrying out water end treatment; 2021. a hot water supply pipe; 2022. a water pipe for cold water; 2023. a water mixing valve;

2030. a cold water source; 2041. a hot water pipe; 2042. a cold water pipe; 2043. a water return pipe.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "top", "bottom", "inner", "outer", and the like, indicate orientations and positional relationships based on the orientations and positional relationships shown in the drawings, are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

The water return valve 1000 according to the embodiment of the present invention is described below with reference to the drawings of the specification, and the water return valve 1000 according to the present invention has a small structure, is easy to process, uses less materials, and can be used in a water supply system having a zero-cold-water heater.

A water return valve 1000 according to an embodiment of the present invention, as shown in fig. 1, fig. 2, and fig. 4, includes: a valve body 100 and a check valve 200.

As shown in fig. 1, the valve body 100 includes four interface parts 101, which are respectively referred to as a first interface part, a second interface part, a third interface part and a fourth interface part for convenience of description; wherein, the tail end of the first interface part is open and is provided with a first water inlet and outlet 112; the second interface part has an open end and is provided with a second water inlet and outlet 122, the third interface part has an open end and is provided with a third water inlet and outlet 132, and the fourth interface part has an open end and is provided with a fourth water inlet and outlet 142. The end portions of the four interface portions 101 intersect, which may be that end portions of the first interface portion, the second interface portion, the third interface portion, and the fourth interface portion intersect with each other, or an end portion of the first interface portion, the second interface portion, the third interface portion, and the fourth interface portion that is common is intersected.

The four interface parts 101 extend in different directions, for example, forward, backward, leftward and rightward, that is, the extending directions between two adjacent interface parts 101 form an included angle, so that the ends of each interface part 101, at which the water inlet and the water outlet are provided, do not intersect with each other, and a certain installation space is provided between two adjacent interface parts 101.

The second inlet/outlet 122 is always connected to the third inlet/outlet 132, that is, the water in the second inlet/outlet 122 or the third inlet/outlet 132 can flow each other to form a first connected channel.

The first water inlet/outlet 112 and the fourth water inlet/outlet 142 are always communicated, that is, the water in the first water inlet/outlet 112 and the fourth water inlet/outlet 142 can flow each other and form another communicated second channel.

The check valve 200 disposed between the first water inlet/outlet 112 and the second water inlet/outlet 122 can control the above two channels to work independently or communicate with each other. When the check valve 200 is opened, the water in the first inlet/outlet port 112 can flow to the second inlet/outlet port 122 in one direction, so that the water in the second passage can flow toward the first passage, but the water in the second passage cannot flow back to the first passage in the opposite direction.

When the check valve 200 is closed, the first channel and the second channel are formed as independent channels, and at this time, the water in the first water inlet/outlet port 112 can flow to the fourth water inlet/outlet port 142, so that the fourth water inlet/outlet port 142 serves as the water outlet side of the second channel. The water in the second inlet/outlet port 122 can flow to the third inlet/outlet port 132, so that the third inlet/outlet port 132 is used as the outlet side of the first channel. It should be further noted that, regardless of whether the check valve 200 is opened or closed, the check valve 200 does not interfere with the communication state of the first passage, and the check valve 200 does not interfere with the communication state of the second passage.

As can be seen from the above structure, in the water return valve 1000 according to the embodiment of the present invention, one ends of the connection parts 101 are disposed in an intersecting manner, so that the internal flow passages are partially communicated, and the other sides of the connection parts 101 are disposed away from each other and extend toward different directions, so that the four connection parts 101 can be respectively used for connecting different pipe sections, and the pipe sections are not interfered with each other when being installed; the tube segments connected to each interface 101 may communicate with respective open-ended water inlets and outlets. Therefore, the water return valve 1000 is small in overall structure, greatly reduced in size and less in material consumption during processing and manufacturing; the occupied installation space is small, and the pipe connection is convenient.

When the check valve 200 is closed, one of the first water inlet/outlet 122 and the fourth water inlet/outlet 142 which are communicated with each other can be used for water inlet and the other can be used for water outlet, and one of the second water inlet/outlet 122 and the third water inlet/outlet 132 can be used for water inlet and the other can be used for water outlet, so that water in different connector parts 101 can be communicated and the flow direction can be changed.

When the check valve 200 is opened, water in the first water inlet/outlet 112 can flow into the second water inlet/outlet 122, and if water is not discharged from the third water inlet/outlet 132, the second water inlet/outlet 122 can discharge the water flowing in the first water inlet/outlet 112 outwards. If the third water inlet/outlet 132 is discharging water, the second water inlet/outlet 122 may further discharge the water flowing in from the first water inlet/outlet 112 toward the third water inlet/outlet 132, thereby implementing various water inlet/outlet manners of the water return valve 1000.

Compared with the water return valve in the prior art, the water return valve 1000 has the advantages that the whole structure is simple, the materials are less during processing and manufacturing, and the processing is easy; the state switching is convenient, the installation is simple, and the zero cold water supply can be realized; the water return valve 1000 of the present invention can be used in various water supply systems to enable the water supply systems to normally use water, and is particularly suitable for storing zero cold water to facilitate water use.

Optionally, the first interface part, the second interface part, the third interface part and the fourth interface part are integrally formed and connected, so that the interface parts are integrally formed, the structure is compact and firm, the appearance is attractive, and the interface parts are not easy to break when in use; in the process of processing and manufacturing, the same die can be used for processing and manufacturing each water return valve 1000, the processing is convenient, the batch error is small, the consistency after processing and forming is high, the relative position of each water inlet and outlet is stable, and each interface part 101 is not easy to displace in the process of using the water return valve 1000.

In other examples, the first interface portion, the second interface portion, the third interface portion, and the fourth interface portion may be connected to each other by subsequent welding, splicing, and the like, so that each interface portion 101 may be processed separately, which facilitates simplifying the mold.

Optionally, the outer side of each interface portion 101 is provided with a thread to facilitate connection of the respective interface portion 101 in a pipe.

In other examples, interface 101 may not be threaded, but may be an interference fit with the pipe.

Alternatively, the water return valve 1000 of the present application may be manufactured using a metal material or engineering plastic, so that the entire water return valve 1000 is easy to process and has sufficient strength and pressure resistance.

In a specific example, as shown in fig. 2 or fig. 4, the first water inlet/outlet 112 is a hot water inlet, denoted as a, which can be used to fill hot water with a higher temperature or warm water with an increased temperature; the second water inlet/outlet 122 is a cold water inlet, denoted as D, which can be used for filling cold water or discharging water with a lower temperature; the third water inlet and outlet 132 is a cold water outlet, marked as C, and can be used for discharging cold water or warm water; the fourth water inlet/outlet 142 is a hot water outlet, denoted as B, which can be used to discharge hot water, and can be plugged in appropriate occasions.

In the above example, as shown in fig. 5 and 6, the water return valve 1000 is disposed near the water using end 2020, and when the check valve 200 is closed, the hot water in the hot water inlet can directly flow toward the hot water outlet to discharge the hot water for the user to use; and the cold water in the cold water inlet can be directly discharged towards the cold water outlet for users to use the cold water, so that the requirements of cold water and hot water at the water using end 2020 are met. When the check valve 200 is opened, the hot water in the hot water inlet can further flow back to the water heater 2010 for heating through the cold water inlet, resulting in zero circulation heating and adequate supply of cold water.

As in the above example, as shown in fig. 7 and 8, the water return valve 1000 is disposed near the water heater 2010, and when the check valve 200 is closed, the cold water in the cold water inlet can be directly discharged to the cold water outlet, and heated by the water heater 2010 and sent to the water using end 2010. When the check valve 200 is opened, water in the water return pipe 2043 enters the valve body 100 through the hot water inlet and passes through the check valve 200 to the cold water outlet, and water in the cold water outlet is heated by the water heater 2010 and then sent to the hot water pipe 2041 and the water return pipe 2043 again, so that zero-cold-water circulation heating and sufficient supply are realized.

Advantageously, the hot water inlet and the hot water outlet are used as hot water ends, the cold water inlet and the cold water outlet are used as cold water ends, and the check valve 200 is arranged between the hot water ends and the cold water ends, so that under the condition that the water using end 2020 needs water, the hot water and the cold water can be isolated and do not interfere with each other, and the water return valve 1000 can meet the basic function. That is, when the water is needed at the water using end 2020 of the first channel and the second channel, the water between the two channels is not mixed.

Alternatively, the first axis of the first inlet/outlet port 112 is not parallel to the second axis of the second inlet/outlet port 122, i.e., the first axis and the second axis have an included angle, which may be an acute angle, a right angle, or an obtuse angle. Therefore, the pipeline connected with the first water inlet and outlet 112 and the pipeline connected with the second water inlet and outlet 122 can respectively face different directions, thereby being convenient for adapting to various installation occasions and being convenient for pipe arrangement and pipe running.

For example, in the specific example shown in fig. 1, 2 and 4, the included angle between the first axis and the second axis is a right angle, that is, the first axis is perpendicular to the second axis, so that the first water inlet/outlet port 112 and the second water inlet/outlet port 122 can be respectively connected with corresponding pipelines in different directions, thereby providing sufficient space for the access of each pipeline and preventing the pipelines from being crowded together. Meanwhile, when the check valve 200 is opened, the water flow entering the valve body 100 from the first water inlet/outlet 112 can further enter the second water inlet/outlet 122 only by reversing, so that the setting position of the check valve 200 is more flexible, and the water pressure at the two sides of the check valve 200 can meet sufficient pressure difference only under certain conditions, thereby effectively blocking the passage from the first water inlet/outlet 112 to the second water inlet/outlet 122.

Optionally, there is an included angle between the first axis of the first water inlet/outlet 112 and the fourth axis of the fourth water inlet/outlet 142, where the included angle is an acute angle, a right angle or an obtuse angle, for example, in a specific example, as shown in fig. 1, fig. 2 and fig. 4, the included angle between the first axis and the fourth axis is a right angle, so that the first water inlet/outlet 112 and the fourth water inlet/outlet 142 can also connect with the corresponding pipes respectively facing different directions, provide sufficient space for the access of each pipe, and enable the upstream side of the check valve 200 to accumulate sufficient water pressure.

Advantageously, the second axis of the second inlet/outlet 122 is arranged coaxially with the fourth axis of the fourth inlet/outlet 142, i.e. the second axis and the fourth axis are collinear, so that the second inlet/outlet 122 and the fourth inlet/outlet 142 face in opposite directions, e.g. when the second inlet/outlet 122 faces downwards, the fourth inlet/outlet 142 faces upwards, and vice versa; for example, when the second water inlet/outlet 122 faces to the left, the fourth water inlet/outlet 142 faces to the right, or vice versa; for example, when the second water inlet/outlet 122 faces forward, the fourth water inlet/outlet 142 faces backward, or vice versa. Therefore, the pipeline connected with the second water inlet and outlet 122 and the pipeline connected with the fourth water inlet and outlet 142 can be arranged in parallel, so that the arrangement of pipes and the utilization of installation space are facilitated. Of course, the orientation of each water inlet and outlet in the present application can be adjusted accordingly according to the actual installation position required by the pipeline or the reserved installation space.

In a specific example, the first axis coincides with an axis of the first interface part, so that the first water inlet/outlet 112 is disposed in the middle of the first interface part, the local strength of the first interface part is prevented from being insufficient, the structure at each position of the first interface part is uniform and stable, and the inner wall is stable under water pressure after water filling, and is not easy to break. The second axis coincides with the axis of the second interface part, so that the second water inlet and outlet 122 is arranged in the middle of the second interface part, the local strength of the second interface part is prevented from being insufficient, the structures of all parts of the second interface part are uniform and stable, and the inner wall is stable under the water pressure after water is filled, so that the inner wall is not easy to break. The third axis coincides with the axis of the third interface part, so that the third water inlet and outlet 132 is arranged in the middle of the third interface part, the local strength of the third interface part is prevented from being insufficient, the structure at each position of the third interface part is uniform and stable, and the inner wall is stable under the action of water pressure and is not easy to break after water is filled. The fourth axis coincides with the axis of the fourth interface part, so that the fourth water inlet/outlet 142 is arranged in the middle of the fourth interface part, the local strength of the fourth interface part is prevented from being insufficient, the structures of all parts of the fourth interface part are uniform and stable, and the inner wall is stable under the water pressure after water is filled, so that the inner wall is not easy to break.

In some embodiments of the present invention, as shown in fig. 2 and 4, a first flow passage 110 (communicating with the first water inlet and outlet 112), a second flow passage 120 (communicating with the second water inlet and outlet 122), a third flow passage 130 (communicating with the third water inlet and outlet 132), and a fourth flow passage 140 (communicating with the fourth water inlet and outlet 142) are provided in the valve body 100, the first flow passage 110 and the fourth flow passage 140 meet and communicate, the third flow passage 130 and the second flow passage 120 meet and communicate, and the valve body 100 has a water return state and a water use state. It should be noted that the water return state corresponds to water return of the later water heater 2010; the water usage state here corresponds to the water usage of the water usage end 2020 in the water supply system described later.

The check valve 200 is disposed on a side of the second flow passage 120 close to the first flow passage 110, the check valve 200 is switchable between a cut-off position and a flow position, the check valve 200 is closed at the cut-off position, and the check valve 200 cuts off the first flow passage 110 and the second flow passage 120; in the flow position, the check valve 200 is open and the check valve 200 communicates the first flow passage 110 with the second flow passage 120. The check valve 200 in the present invention can control the flow direction of the water flow to be a set direction, but not to be the opposite direction of the set direction.

When the valve body 100 is switched from the water use state to the water return state, the check valve 200 is switched from the blocking position to the flow position, and is switched from the closed position to the open position, so that the water in the first flow passage 110 flows into the second flow passage 120 or the third flow passage 130. That is, when the valve body 100 is switched to the water return state, the check valve 200 is triggered to switch the position, and when the valve body 100 is in the water use state, the check valve 200 is in the cut-off position, and at this time, the water in the first flow passage 110 cannot flow into the second flow passage 120 or the third flow passage 130; when the valve body 100 is in the water returning state, the check valve 200 is in the flow position where water in the first flow passage 110 may flow into the second flow passage 120 or the third flow passage 130.

According to the water return valve 1000 of the embodiment of the invention, in the water return state, under the driving of an external force, for example, the driving may be an electric signal driving or a differential water pressure driving, the check valve 200 is switched to the circulation position, so that the water in the first flow channel 110 is flushed to the second flow channel 120 or further enters the third flow channel 130 from the second flow channel 120, thereby the hot water is guided into the circulation flow channel through the water return valve 1000, and the functions of hot water circulation and zero cold water are realized.

In the water using state, the check valve 200 is at the blocking position, the first flow passage 110 and the second flow passage 120 do not work independently, and the first flow passage 110 and the third flow passage 130 also do not work independently, so that the water in the first flow passage 110 does not flow into the second flow passage 120 or the third flow passage 130, while the cold water or the stored hot water with a certain temperature can flow into the third flow passage 130 from the second flow passage 120, or the hot water with a certain temperature can flow into the water using end 2020 from the first flow passage 110, thereby the water using system works normally, and the water using is instantly opened and heated.

The water return valve 1000 of the present invention has a small overall structure, is easy to manufacture and install, and can be used in systems requiring zero cold water supply.

Optionally, the check valve 200 is disposed at a junction of the third flow channel 130 and the second flow channel 120, when the valve body 100 is in a water use state, the check valve 200 blocks the first flow channel 110 and the second flow channel 120, and when water flows between the third flow channel 130 and the second flow channel 120, at least a portion of the water passes through the check valve 200. In these examples, the check valve 200 does not always obstruct the communication between the third flow passage 130 and the second flow passage 120 regardless of the state of the check valve 200, and water therebetween is always communicated. The state of the check valve 200 changes whether the first flow channel 110 and the second flow channel 120 are connected or not, so that water can flow from the first flow channel 110 to the second flow channel 120 when the check valve 200 is opened, and the water cannot flow from the first flow channel 110 to the second flow channel 120 when the check valve 200 is closed.

In some embodiments of the present invention, as shown in fig. 2 and 4, a transition chamber 150 is disposed in the valve body 100, one end of the first flow passage 110 and one end of the second flow passage 120 are both connected to the transition chamber 150, the third flow passage 130 is connected to a sidewall of the second flow passage 120, and the check valve 200 is disposed at one end of the second flow passage 120 close to the transition chamber 150. In these examples, the transition cavity 150 is provided to facilitate the communication between the first flow passage 110 and the second flow passage 120, and to further allow the water in the first flow passage 110 to flow to the transition cavity 150, so as to provide a certain water flow pressure difference for opening the check valve 200, so that the check valve 200 can be triggered to switch to the circulation state when the valve body 100 is in the water return state, so that the water in the transition cavity 150 flows into the second flow passage 120.

In some examples, the transition chamber 150 is a separate chamber opened in the valve body 100, so that the water in the first flow channel 110 flows into the second flow channel 120 with a sufficient amount of water, a certain water pressure can be formed, and the water flow process can be more stable.

Advantageously, the first flow channel 110, the second flow channel 120, the third flow channel 130 and the fourth flow channel 140 are straight flow channels, and the inner diameter of the first flow channel 110 is the same as the aperture of the first water inlet/outlet 112, the inner diameter of the second flow channel 120 is the same as the aperture of the second water inlet/outlet 122, the inner diameter of the third flow channel 130 is the same as the aperture of the third water inlet/outlet 132, and the inner diameter of the fourth flow channel 140 is the same as the aperture of the fourth water inlet/outlet 142. Thereby keeping the flow area of each flow passage within a preset range and facilitating the processing and manufacturing; when water flows in each flow channel, the straight flow channel can also reduce the scouring of liquid to the wall of the flow channel, thereby being beneficial to the long-term use of the water return valve 1000.

In some examples, a portion of the first flow passage 110 is configured as a transition chamber 150, an end of the second flow passage 120 is in perpendicular communication with the first flow passage 110, and a check valve 200 is provided at an intersection between the second flow passage 120 and the first flow passage 110 to close. So that the water in the first flow passage 110 does not flow into the second flow passage 120 in the water using state of the valve body 100; in the water return state of the valve body 100, the water in the first flow passage 110 flows into the second flow passage 120 or further flows into the third flow passage 130.

In other examples, the portion of the second flow passage 120 is configured as a transition chamber 150, the end of the first flow passage 110 perpendicularly intersects the first flow passage 110, and a one-way valve 200 is disposed in the second flow passage 120 near the intersection between the second flow passage 120 and the first flow passage 110 to close. So that the water in the first flow passage 110 does not flow into the second flow passage 120 in the water using state of the valve body 100; in the water return state of the valve body 100, the water in the first flow passage 110 flows into the second flow passage 120 or further flows into the third flow passage 130.

Alternatively, as shown in fig. 2 and 4, a first junction port 111 is formed at one end of the first flow passage 110 close to the transition chamber 150, a flow passage wall of the second flow passage 120 extends to the first junction port 111, a second junction port 121 is formed at one end of the second flow passage 120 close to the transition chamber 150, and in a cut-off position, the check valve 200 blocks the second junction port 121. That is, the check valve 200 does not protrude into the transition chamber 150, the check valve 200 does not occupy the space of the transition chamber 150, and the check valve 200 is switched to the flow position after sufficient water flows into the transition chamber 150 in the first flow passage 110, so that the water in the first flow passage 110 can stably flow into the second flow passage 120. In a specific example, the aperture of the first junction 111 is smaller than the first water inlet/outlet 112, that is, the outlet of the first flow channel 110 is partially covered by the flow channel wall of the second flow channel, which can increase the water pressure and the water flow speed flowing from the first junction 111 into the transition chamber 150.

Alternatively, as shown in fig. 2 and 4, the communication port 131 of the third flow passage 130 on the second flow passage 120 at least partially overlaps with the valve body of the check valve 200, and the check valve 200 is open toward one end of the second water inlet/outlet 122, in these examples, one end of the check valve 200 is half-open, and the other end is both closable and openable. The side facing the opening of the second water inlet/outlet 122 can allow water to pass through smoothly without blocking the flow of water between the third flow channel 130 and the second flow channel 120, so as to ensure that the flow cross-sectional area of the flow channel is large enough, which is beneficial to the great reduction of the overall size of the water return valve 1000, and thus the water flow communication state between the third flow channel 130 and the second flow channel 120 is not affected no matter the check valve 200 is at the stop position or the flow position. A portion of the third flow passage 130 is blocked by the check valve 200 so that the water in the first flow passage 110 does not flow into the second flow passage 120 when the check valve 200 is at a blocking position.

Advantageously, as shown in fig. 2 and 4, the third flow passage 130 at least partially overlaps the first flow passage 110 in a projection perpendicular to the axial direction of the check valve 200. That is, the third flow passage 130 is collinear with the axis of the first flow passage 110, and the entire valve body 100 is arranged in a crisscross manner in appearance; or the third flow passage 130 is parallel to the axis of the first flow passage 110 so that the two flow passages are arranged offset, in which case the entire valve body 100 has a substantially cross-shaped, but not strictly cross-shaped appearance.

In any of the above-described arrangements of the third flow passage 130 and the first flow passage 110, as shown in fig. 2 and 4, the third flow passage 130 is provided with a first rib 133 extending in the opening direction of the check valve 200 on the side wall of the flow passage on the side close to the check valve 200; the first flow passage 110 is provided with a second rib 123 extending in the closing direction of the check valve 200 on a flow passage side wall on a side close to the check valve 200.

The first and

second ribs

133 and 123 may be arranged such that the third flow passage 130 and the first flow passage 110 are not directly communicated regardless of their arrangement, but are separated by the check valve 200. That is, the check valve 200 can be switched to different positions, such as the aforementioned blocking position and the flow-through position, by moving relative to the first rib 133 and the second rib 123, and when the check valve 200 is located at the blocking position, the first rib 133, the second rib 123 and the check valve 200 together block the third flow channel 130 and the first flow channel 110, so that the water in the first flow channel 110 does not flow into the second flow channel 120, and even does not flow into the third flow channel 130.

When the check valve 200 is located at the circulation position, the first ribs 133 and the second ribs 123 further guide the water flow, so that the water flow enters the third flow channel 130 or the second flow channel 120 through the check valve 200, thereby forming different forms of water inlet and outlet modes.

Meanwhile, in the above example, the third flow passage 130 may be closer to the transition chamber 150 and may be more coaxial with the first flow passage 110, and the water return valve 1000 may be more compact and compact as a whole, and may enable the water flow to flow into the third flow passage 130 faster when the check valve 200 is opened by adjusting the lengths of the first rib 133 and the second rib 123, without remaining in the second flow passage 120 for an excessive time, so as to effectively prevent the cold water in the second flow passage 120 from being mixed with the water in the first flow passage 110 in a part of the water inlet and outlet circulation flow paths (for example, in the example of the water return state of the water heater 2010 having the water return pipe supply system 2200, the zero cold water circularly heated in the water heater 2010 may be more quickly introduced into the third flow passage 130 from the first flow passage 110 without being mixed with the cold water in the second flow passage 120).

Optionally, as shown in fig. 2 and 4, the first rib 133 and the second rib 123 are both disposed on a side close to the transition cavity 150 and on a same side of the check valve 200, and are used as part of channels when the check valve 200 is plugged, so that the check valve 200 is more conveniently disposed, and the check valve 200 is easier to plug the first flow channel 110 and the second flow channel 120, and the first flow channel 110 and the third flow channel 130.

In some specific examples, the first rib 133 is an extension of a partial flow channel wall of the fourth flow channel 140, the second rib 123 is an extension of a partial flow channel wall of the second flow channel 120, and the extension directions of the first rib 133 and the second rib 123 are opposite, and projections of the first rib 133 and the second rib 123 on an axis perpendicular to the check valve 200 at least partially overlap, so that the first rib 133 blocks the communication port 131 of the third flow channel 130 and the second flow channel 120, and the opening size of the communication port 131 is smaller than the flow channel cross-sectional size of the third flow channel 130; the second rib 123 is arranged at the first intersection port 1111 of the first flow channel 110 and the transition cavity 150 in a shielding manner, the opening size of the first intersection port 1111 is smaller than the size of the cross section of the first flow channel 110, so that under the condition that the water return valve 1000 is integrally compact, the water in the first flow channel 110 can smoothly flow out of the transition cavity 150, the water in the second flow channel 120 can smoothly flow into the third flow channel 130, and the one-way valve 200 does not always shield the flow of the water flow between the third flow channel 130 and the second flow channel 120.

Advantageously, the sides of the first rib 133 and the second rib 123 facing each other are provided with a groove in which the end surface of the check valve 200 is engaged, so that one end of the check valve 200 does not move axially.

Optionally, as shown in fig. 1, 2 and 4, the water return valve 1000 further includes a clip 300, and an end of the check valve 200 away from the second junction port 121 is connected in the second flow passage 120 through the clip 300, so that a portion of the check valve 200 is fixed in position relative to the second flow passage 120 and is not flushed to other positions by water flowing through, and the operation of the check valve 200 is ensured to be always effective.

In some specific examples, the clip 300 is a clip spring, which is assembled at one end of the check valve 200 and is clipped in the flow passage wall of the second flow passage 120. For example, the walls of the flow passage may be provided with cooperating grooves or projections to enable the circlip to be restrained in a particular position. In other examples, the cartridge 300 may also be a snap provided at one end of the check valve 200, and is not particularly limited herein.

Alternatively, as shown in fig. 2 and 3, the check valve 200 includes a blocking portion 210, an accommodating portion 220 and an elastic member 230, the elastic member 230 is sleeved between the blocking portion 210 and the accommodating portion 220, so that the blocking portion 210 is telescopically connected to the accommodating portion 220, and the accommodating portion 220 is disposed toward the second water inlet/outlet 122. The accommodating portion 220 is for supporting the elastic member 230 and defines the maximum movable position of the blocking portion 210; the blocking portion 210 is a main blocking component, and can block or release the passage between the first water inlet and outlet 112 and the second water inlet and outlet 122 under the action of the elastic member 230.

Further, the elastic member 230 can drive the blocking portion 210 to move away from the accommodating portion 220, so that the blocking portion 210 blocks between the first water inlet and outlet 112 and the second water inlet and outlet 122. When the elastic member 230 moves in a direction away from the accommodating portion 220, the elastic member 230 stretches or resets, and the blocking portion 210 drives and blocks the passage between the first water inlet and outlet 112 and the second water inlet and outlet 122; when the elastic member 230 is compressed by a force, the elastic member 230 moves toward the accommodating portion 220, and the blocking portion 210 opens a passage between the first water inlet/outlet 112 and the second water inlet/outlet 122.

More specifically, the receiving portion 220 is connected in the second flow passage 120. That is, when the blocking portion 210 receives the driving force of the water flow, the elastic member 230 contracts, so that the blocking portion 210 contracts relative to the accommodating portion 220 and stores the force, and at this time, the blocking portion 210 avoids the second intersection port 121, and the check valve 200 is in the flow position. When the blocking portion 210 loses the driving force of the water flow, the contracted elastic member 230 releases the force to push the blocking portion 210 to the second junction port 121 again, and the check valve 200 is at the stop position. The accommodating part 220 is stably defined in the second flow passage 120 at all times during the expansion and contraction movement of the blocking part 210, and supports the elastic member 230.

Optionally, the elastic member 230 is a rectangular spring, one side of the blocking portion 210 facing the second intersection port 121 forms a tapered surface, one side of the blocking portion 210 facing the accommodating portion 220 is provided with a connecting rod 211, the connecting rod 211 is located in the accommodating portion 220, the elastic member 230 is sleeved on the connecting rod 211, one end of the elastic member 230 is connected to the bottom of the blocking portion 210, the other side of the elastic member 230 contacts the blocking portion 210, and when the blocking portion 210 moves toward the accommodating portion 220, the elastic member 230 is compressed. The elastic member 230 disposed on the connecting rod 211 contracts stably, so that the elastic member 230 transfers force stably, which is beneficial for the blocking portion 210 to close and stably communicate with the second intersection port 121.

In other examples, the elastic member 230 may also be a torsion spring, one end of which is connected to the blocking portion 210 and the other end of which is connected to the accommodating portion 220, and the torsion spring stores power when the blocking portion 210 moves towards the accommodating portion 220; when the blocking portion 210 loses the external driving force, the torsion spring releases the force to drive the blocking portion 210 to return to the second intersection port 121, so that the check valve 200 is at the stop position. Still alternatively, the elastic member 230 may be a spring plate, one end of the spring plate is connected to the accommodating portion 220, and the other end of the spring plate is connected to the blocking portion 210.

Advantageously, the side of the second junction port 121 facing the blocking portion 210 is provided with a sealing ring, and the blocking portion 210 is fitted on the sealing ring to improve the sealing performance of the check valve 200 at the stop position.

Advantageously, the outer diameter of the accommodating portion 220 is at least partially smaller than the inner diameter of the second flow channel 120, and water in the second flow channel 120 can bypass the accommodating portion 220 and enter the third flow channel 130, that is, the one-way valve 200 is arranged so as not to interfere with the communication relationship between the third flow channel 130 and the second flow channel 120, and water in the second flow channel 120 can enter the third flow channel 130 all the time as long as the third flow channel 130 needs to discharge water.

More specifically, the maximum cross-sectional size of the accommodating part 220 is smaller than that of the blocking part 210, the one-way valve 200 is half opened toward one side of the second water inlet/outlet 122, and water in the second water inlet/outlet 122 can communicate with water in the third water inlet/outlet 132 by bypassing the accommodating part 220. By adopting the one-way valve 200, the convenience of water circulation between the third flow channel 130 and the second flow channel 120 can be greatly improved, the arrangement positions of the one-way valve 200 and the third flow channel 130 are more flexible, and the improvement of the structural compactness of the whole water return valve 1000, the increase of the diversity of water inlet and outlet modes and the improvement of the reliability of water inlet and outlet control are facilitated.

In other examples, the accommodating portion 220 is provided with an avoiding channel, and the avoiding channel is communicated with the third flow channel 130 and the second flow channel 120, so that the third flow channel 130 and the second flow channel 120 are always communicated.

Optionally, the check valve 200 is a half-flow regulating valve, one end of the check valve 200 can close the second flow channel 120, and the other end of the check valve 200 is completely communicated with the second flow channel 120, so that the flow of water inside is not disturbed. And sufficient water flow can be ensured, so that the whole valve body 100 is smaller in size, less in material consumption and convenient to mount.

In some embodiments of the present invention, as shown in fig. 1, 2, 3 and 4, the water return valve 1000 further includes a filtering element 400, the filtering element 400 is disposed in the first flow passage 110, and after water enters the first flow passage 110, the filtering element 400 can trap impurities in the water flowing through the first flow passage 110, so as to improve the quality of the water in the circulation flow passage or the water flowing to the water heater 2010, and prevent the impurities from blocking internal components and affecting the flow rate of the water. The filter element 400 also disperses water entering the transition chamber 150 into a plurality of streams, which facilitates a more gradual and steady flow of water.

Alternatively, the filter member 400 is a water filtering net, the axis of the filter member 400 coincides with the axis of the first flow passage 110, and the filter member 400 has a net structure with one side protruding, so that the water filtering area of the filter member 400 is increased without affecting the flow rate of the water flowing through the first flow passage 110.

Optionally, the filtering member 400 is a cylindrical structure with a spherical top, one end of the filtering member 400 abuts against the first intersection 111, and the other end of the filtering member 400 abuts against the inner wall of the first flow passage 110, so as to be conveniently arranged in the first flow passage 110, and realize the most efficient purification of the inlet water in the first flow passage 110.

In some specific examples, as shown in fig. 3, when a part of the channel wall of the second channel 120 extends into the first junction 111 (the part of the channel wall may also be the second rib 123 as described above), an end of the filter element 400 may abut against the part of the channel wall of the second channel 120, so as to limit the position of the end of the filter element 400.

In some embodiments of the present invention, as shown in fig. 1 and 2, the water return valve 1000 further includes a flow stabilizer 500, the flow stabilizer 500 is disposed in the interface portion provided with the third water inlet and outlet 132, and more specifically, the flow stabilizer 500 is disposed in the third flow channel 130, and the flow stabilizer 500 is disposed therein, so that the flow rate and the flow velocity of water flowing through the third flow channel 130 can be effectively controlled under different water pressures, and the water pressure in the third flow channel 130 is prevented from being too high to cause misjudgment of the system. When the flow stabilizing piece 500 is applied to the water supply system 2100 without the water return pipe, the water flow in the third flow channel 130 can be kept within a certain range, the flow detected by the water heater 2010 is lower than the starting flow, and therefore the water heater 2010 can be effectively controlled to be started by the cold water when the cold water is used in the water end 2020, so that the water pressure is too high, and the water heater 2010 is started by mistake. At the same time, the flow stabilizer 500 may further reduce the flow noise when the cold water at the water end 2020 is discharged. In these examples, the water return valve 1000 is adapted to be positioned proximate the water usage end 2020.

Alternatively, in other examples, as shown in fig. 4, the flow stabilizer 500 may not be disposed in the third flow passage 130, so that the amount of inlet and outlet water of the water heater 2010 is reliably ensured. In these examples, the water return valve 1000 is adapted to be positioned proximate to the water heater 2010.

Optionally, the flow stabilizing ring can be selected as the flow stabilizing piece 500, the flow of the flow stabilizing core in the flow stabilizing ring is 6-8L/min, the water amount can be stabilized within the range of 6 +/-1L/min, the flow of cold water cannot be too high, the pressure of a cold water end cannot be too low, pressure difference cannot be formed, and therefore the water flowing into the cold water end from a hot water end is too large, the flow stabilizing effect is reliably guaranteed, and the water heater 2010 is prevented from being started by mistake.

The structure and the operation principle of the flow stabilizer 500 in the present invention are well known in the prior art, and are not described herein.

In some embodiments of the present invention, as shown in fig. 2 and 4, the fourth flow channel 140 is always in communication with the first flow channel 110. That is, when the check valve 200 is at the blocking position, the water in the first flow channel 110 may enter the fourth flow channel 140, for example, the hot water may directly flow into the fourth flow channel 140 through the first flow channel 110 and then flow from the fourth flow channel 140 to the water using end 2020.

In the example that the fourth flow channel 140 is not required to pass water outwards, as shown in fig. 4, the water return valve 1000 further includes a blocking cover 600, the blocking cover 600 is covered on the fourth water inlet/outlet 142, and more specifically, the blocking cover 600 is covered on the fourth water inlet/outlet 142 at an end of the fourth flow channel 140 far from the first flow channel 110, so that a certain water storage space can be formed between the first flow channel 110 and the fourth flow channel 140, for example, the aforementioned transition cavity 150 can be formed, which is more beneficial to opening the check valve 200.

Optionally, as shown in fig. 2 and 4, a third junction 141 is formed on a side of the fourth flow passage 140 facing the transition chamber 150, and the third junction 141 faces the second junction 121, so as to facilitate the water in the transition chamber 150 to further flow into the second flow passage 120.

In some specific examples, a portion of the fourth flow passage 140 forms a transition chamber 150, the first flow passage 110 is vertically connected to the fourth flow passage 140, and a portion of a flow passage wall of the fourth flow passage 140 is connected to a flow passage wall of the second flow passage 120, so that the transition chamber 150 does not need to be separately opened in the valve body 100.

Advantageously, the first flow channel 110 and the second flow channel 120 are vertically arranged, the third flow channel 130 and the second flow channel 120 are vertically arranged in a crossed manner, the fourth flow channel 140 and the first flow channel 110 are vertically connected in a crossed manner, the axis of the fourth flow channel 140 coincides with the axis of the second flow channel 120, the axis of the first flow channel 110 is parallel to the axis of the third flow channel 130, that is, the first intersection 111 of the first flow channel 110 is not directly opposite to the intersection of the third flow channel 130 and the second flow channel 120, but is completely staggered, and the finally formed water return valve 1000 is of a roughly cross-shaped structure, small and exquisite in overall structure, convenient to install, convenient to flow water and reliable to control.

In the description of the invention, features defined as "first", "second", "third" and "fourth" may explicitly or implicitly include one or more of the features for distinguishing between the described features, whether sequential or not.

In summary, the water return valve 1000 according to the embodiment of the invention optimizes the internal flow passage structure of the valve body 100, optimizes the appearance structure of the valve body 100, and ensures that the size is greatly reduced, the material consumption is reduced, the accessories are optimized, and the service performance of the water return valve 1000 is improved on the premise that the water return valve 1000 is pressure-resistant and convenient to install.

It should be noted that A, B, C, D indicated in the drawings of the present specification have the same position, so that it is convenient to identify the position at which each flow channel of the water return valve 1000 is connected to the non-return water supply system 2100 or the return water supply system 2200, and also to identify the flow direction of the water flow.

A no-return water supply system 2100 according to an embodiment of the present invention will be described with reference to the accompanying drawings.

A backwater-free water supply system 2100 according to an embodiment of the present invention, as shown in fig. 5 and 6, includes: a water heater 2010, a water using end 2020, a water return valve 1000 and a cold water source 2030, wherein the water return valve 1000 is an embodiment of the water return valve 1000 with the fourth flow channel 140.

As shown in fig. 5 and 6, the water heater 2010 includes an inlet pipe 2011 and an outlet pipe 2012, wherein the inlet pipe 2011 can be used for feeding water into the water heater 2010, and the outlet pipe 2012 can discharge the heated hot water of the water heater 2010 to the outside.

The water supply end 2020 is connected to a hot water supply pipe 2021 and a cold water supply pipe 2022. The water end 2020 may be a domestic sink, shower, bath, or other end-use water device. The hot water line 2021 may provide hot water to the water end 2020, and the cold water line 2022 may provide cold water to the water end 2020.

Referring to fig. 2 and 5, the fourth water inlet/outlet 142 is connected to the hot water pipe 2021, and the third water inlet/outlet 132 is connected to the cold water pipe 2022; the first water inlet/outlet port 112 is communicated with the water outlet pipe 2012 through a hot water pipe 2041, and the second water inlet/outlet port 122 is communicated with the water inlet pipe 2011 through a cold water pipe 2042.

The cold water source 2030 is respectively communicated with the water inlet pipe 2011 and the cold water pipe 2042, wherein the cold water source 2030 can be a main tap water pipe or a water storage tank or a regeneration water tank as long as a sufficient amount of water for life and bathing can be provided.

As shown in fig. 5, when the water heater 1000 returns water, the check valve 200 is opened, and the hot water in the outlet pipe 2012 flows from the first water inlet/outlet 112 to the second water inlet/outlet 122, and returns to the inlet pipe 2011 through the cold water pipe 2042.

As can be seen from the above structure, in the water supply system 2100 without a return pipe according to the embodiment of the present invention, when the water heater 2010 returns water, under the driving of the relevant components of the water heater 2010 (specifically, the driving pump 2013 disposed in the water heater 2010 shown in fig. 5 or fig. 6), the hot water in the water outlet pipe 2012 flows to the first water inlet/outlet 112 through the hot water pipe 2041 and flows into the first flow passage 110 through the first water inlet/outlet 112, and the water end 2020 does not use water at this time, so that the water in the fourth flow passage 140 (communicated with the fourth water inlet/outlet 142) and the water in the third flow passage 130 (communicated with the third water inlet/outlet 132) do not flow outward at this time, the hot water flowing into the first water inlet/outlet 112 continues to flow toward the first flow passage 110, and the hot water in the first flow passage 110 continues to flow passage 120, and the generated pressure difference causes the check valve 200 to be switched from closed to open, that is to open, the check valve 200 is switched from the blocking position to the circulating position, so that the hot water further flows through the second flow passage 120 and flows back to the water inlet pipe 2011 through the cold water pipe 2042, and is further sent to the water heater 2010 for heating, thereby forming a circulation loop and realizing a certain zero cold water reserve.

As shown in fig. 6, in the water using state, the check valve 200 is closed and at the stop position, at this time, since a part of the hot water is already stored in the cold water pipe 2042 and the hot water pipe 2041, when the water using end 2020 requires water use, the water flows from the cold water pipe 2042 to the second water inlet/outlet 122, then enters the second flow channel 120, then flows to the third water inlet/outlet 132 through the third flow channel 130, then enters the cold water using pipe 2022 from the third water inlet/outlet 132, and finally enters the water using end 2020; the water also enters the first water inlet/outlet 112 from the hot water pipe 2041, then enters the first flow passage 110 from the first water inlet/outlet 112, flows to the fourth flow passage 140 from the first flow passage 110, then enters the hot water using pipe 2021, and finally enters the water using end 2020, so that the hot water at the water using end 2020 can be used immediately.

Alternatively, in the example of fig. 5 and 6 of the present application, the water return valve 1000 is disposed close to the water using end 2020, so that when the water using end 2020 takes cold water alone, the cold water flow is too large, which may cause the water heater 2010 to be started by mistake, at this time, the aforementioned water return valve 1000 having the flow stabilizing member 500 may be employed, and the flow stabilizing member 500 is provided as a fitting in the third interface portion provided with the third water inlet 132 and is further provided in the third flow passage 130, so that the problem of the water heater 2010 being started by mistake when the water using end 2020 takes cold water may be effectively solved.

Optionally, as shown in fig. 5 and 6, a mixing valve 2023 is further disposed near the water using end 2020, and the mixing valve 2023 is respectively communicated with the cold water using pipe 2022 and the hot water using pipe 2021, so that the hot water and the cold water flowing to the water using end 2020 can be uniformly mixed, and the water using temperature is comfortable and convenient to control.

The backwater pipe water supply system 2200 of the embodiment of the present invention will be described with reference to the accompanying drawings of the specification.

A water returning pipe supply system 2200 according to an embodiment of the present invention, as shown in fig. 7 and 8, includes: the water heater 2010, the water using end 2020, the water return valve 1000 in the previous example, and the cold water source 2030, the structure of the water return valve 1000 can be referred to the above, and are not described herein.

As shown in fig. 7 and 8, the water heater 2010 includes an inlet pipe 2011 and an outlet pipe 2012, wherein the inlet pipe 2011 can be used for feeding water into the water heater 2010, and the outlet pipe 2012 can discharge the heated hot water of the water heater 2010 to the outside.

The water using end 2020 is connected with a hot water using pipe 2021 and a cold water using pipe 2022, the hot water using pipe 2021 is communicated with a water outlet pipe 2012 through a hot water pipe 2041, and the water using end 2020 can be used as terminal water using equipment such as a household washbasin, shower equipment, bath equipment and the like. The hot water line 2021 may provide hot water to the water end 2020, and the cold water line 2022 may provide cold water to the water end 2020.

Referring to fig. 4 and 7, the third water inlet/outlet 132 is connected to the water inlet 2011, and the first water inlet/outlet 112 is connected to the hot water pipe 2041 via the water return pipe 2043.

The cold water source 2030 is connected with the second water inlet and outlet 122, the cold water source 2030 is connected with the cold water pipe 2022 through the cold water pipe 2042, wherein the cold water source 2030 may be a main water pipe of tap water, a water storage tank or a regeneration water tank, as long as a sufficient amount of water for life and bathing can be provided.

As shown in fig. 7, when the water heater 2010 returns water, the water in the water return pipe 2043 flows through the first water inlet/outlet port 112 to the third water inlet/outlet port 132, and returns the water to the water heater 2010.

As can be seen from the above structure, in the water supply system 2200 with a water return pipe according to the embodiment of the present invention, as shown in fig. 7, when the water heater 2010 returns water, under the driving of the relevant components of the water heater 2010 (specifically, the driving pump 2013 disposed in the water heater 2010 shown in fig. 7 or fig. 8), the hot water in the water outlet pipe 2012 enters the hot water pipe 2041, flows into the water return pipe 2043 through the hot water pipe 2041, then enters the first water inlet/outlet port 112 from the water return pipe 2043, and then enters the first flow passage 110 through the first water inlet/outlet port 112, because the water in the second water inlet/outlet port 122 does not flow outward at this time, and the third water inlet/outlet port 132 is communicated with the water inlet pipe 2011, a pressure difference is generated between the first flow passage 110 (communicated with the first water inlet/outlet port 112), the second flow passage 120 (communicated with the second water inlet/outlet port 122), and the third flow passage 130 (communicated with the third water inlet/outlet port 132), so that the check valve 200 is switched from being closed to open, and then the stop position is switched to the circulation position, so that the hot water further enters the third flow channel 130 through the second flow channel 120 and then flows back to the water inlet pipe 2011 through the third water inlet and outlet 132 to form a circulation loop, and certain zero cold water storage is realized.

As shown in fig. 8, in the water using state, the check valve 200 is closed and at the blocking position, and at this time, since a part of the hot water is already stored in the hot water pipe 2041, when the water using end 2020 requires water, the hot water with a certain temperature flows into the hot water using pipe 2021 from the hot water pipe 2041 and finally enters the water using end 2020, so that the hot water using end 2020 can be instantly used by boiling water.

Alternatively, in the example of fig. 7 and 8 of the present application, the water return valve 1000 is disposed near the water heater 2010, and the water return valve 1000 does not need the fourth flow channel 140 to pass water to the outside, so the fourth flow channel 140 can be blocked by the aforementioned blocking cover 600. In addition, in the third flow passage 130, the flow stabilizer 500 does not need to be provided in the return valve 1000 shown in fig. 7 and 8, and thus it is possible to ensure a sufficient amount of water flowing out of the third flow passage 130, to simplify the structure of the return valve 1000, and to ensure a flow rate of water.

A water heater 2010 of an embodiment of the present invention is described below with reference to the drawings of the specification.

A water heater 2010 according to an embodiment of the invention includes the aforementioned embodiment of the water return valve 1000 with the blocking cover 600.

According to the water heater 2010 of the embodiment of the invention, the water return valve 1000 with the blocking cover 600 is arranged on a pipeline close to the water heater 2010, so that the water heater 2010 has a zero-cold-water supply function, and reference can be made to the description of the zero-cold-water supply in the water return pipe supply system 2200, which is not described herein again.

Or, the water return valve 1000 with the blocking cover 600 is arranged in the water heater 2010, and the flow stabilizing piece 500 is not arranged in the third flow channel 130, so that the water heater 2010 with the water return pipe 2043 can realize large-flow water return, the sufficient hot water quantity is ensured, and the hot water can be instantly used after being opened.

Optionally, the water heater 2010 of the present invention is a gas water heater, a gas wall-hanging stove, a heat storage gas water heater, or other products with a zero cold water preheating circulation function, and is not limited specifically here.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The water return valve 1000, the water supply system 2100 without a water return pipe, the water supply system 2200 with a water return pipe, the heating principle of the water by the water heater 2010 in the water heater 2010, the driving principle of the driving pump 2013, and the one-way blocking principle of the one-way valve 200 according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail herein.

In the description herein, references to the description of the terms "embodiment," "example," etc., mean 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 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.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the 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 water return valve, comprising:

the valve body comprises four connecting ports with the ends meeting, and each connecting port extends towards different directions; the tail ends of the four connecting parts are open and respectively form a first water inlet and outlet, a second water inlet and outlet, a third water inlet and outlet and a fourth water inlet and outlet, the second water inlet and outlet is always communicated with the third water inlet and outlet, and the first water inlet and outlet is always communicated with the fourth water inlet and outlet;

the one-way valve is arranged between the first water inlet and outlet and the second water inlet and outlet, and when the one-way valve is opened, water in the first water inlet and outlet can flow to the second water inlet and outlet in a one-way mode; when the one-way valve is closed, water in the first water inlet and outlet can flow to the fourth water inlet and outlet, and water in the second water inlet and outlet can flow to the third water inlet and outlet.

2. The water return valve of claim 1 wherein the first axis of the first water inlet/outlet is non-parallel to the second axis of the second water inlet/outlet; a second axis of the second water inlet/outlet is coaxially arranged with a fourth axis of the fourth water inlet/outlet; an included angle exists between the first axis and the fourth axis.

3. The water return valve according to claim 1, wherein a first flow passage communicating with the first water inlet/outlet, a second flow passage communicating with the second water inlet/outlet, a third flow passage communicating with the third water inlet/outlet, and a fourth flow passage communicating with the fourth water inlet/outlet are provided in the valve body; the first flow passage and the fourth flow passage are intersected and communicated, and the second flow passage and the third flow passage are intersected and communicated; the valve body has a water return state and a water using state;

the one-way valve is arranged on one side, close to the first flow channel, of the second flow channel, can be switched between a stop position and a flow position, and is closed when the one-way valve is in the stop position, and the one-way valve cuts off the first flow channel and the second flow channel; in the flow position the one-way valve is open, the one-way valve communicating the first flow passage with the second flow passage; when the valve body is switched from the water using state to the water returning state, the one-way valve is switched from the stop position to the circulation position, so that the water in the first flow channel flows into the second flow channel or the third flow channel.

4. The water return valve according to claim 3, wherein the check valve is disposed at the junction of the second flow passage and the third flow passage, the check valve blocks the first flow passage and the second flow passage when the valve body is in the water use state, and water flows between the second flow passage and the third flow passage at least partially through the check valve.

5. The water return valve according to claim 4, wherein a communication port of the third flow passage on the second flow passage at least partially overlaps a valve body of the check valve, and the check valve is open toward one end of the second water inlet/outlet port.

6. The water return valve according to claim 1 wherein the check valve includes a blocking portion, an accommodating portion and an elastic member, the elastic member is sleeved between the blocking portion and the accommodating portion to telescopically connect the blocking portion to the accommodating portion, the elastic member can drive the blocking portion to move in a direction away from the accommodating portion to close the check valve, and the accommodating portion is disposed toward the second water inlet/outlet.

7. The water return valve according to claim 6 wherein the maximum cross-sectional dimension of the accommodating portion is smaller than the maximum cross-sectional dimension of the blocking portion, the one-way valve is half-opened toward one side of the second inlet/outlet port, and water in the second inlet/outlet port can communicate with water in the third inlet/outlet port bypassing the accommodating portion.

8. The water return valve according to any one of claims 1 to 7, further comprising a flow stabilizer, wherein the flow stabilizer is arranged in the interface portion provided with the third water inlet and outlet, and the flow stabilizer comprises a flow stabilizing core with a flow rate of 6-8L/min.

9. The water return valve according to any one of claims 1 to 7, further comprising a blocking cover provided at the fourth water inlet/outlet.

10. A no return water pipe water supply system, its characterized in that includes:

the water heater comprises a water inlet pipe and a water outlet pipe;

the water using end is connected with a hot water using pipe and a cold water using pipe;

the water return valve according to claim 8, wherein the fourth water inlet and outlet is communicated with the hot water pipe, and the third water inlet and outlet is communicated with the cold water pipe; the first water inlet and outlet is communicated with the water outlet pipe through a hot water pipe, and the second water inlet and outlet is communicated with the water inlet pipe through a cold water pipe;

the cold water source is respectively communicated with the water inlet pipe and the cold water pipe;

when the water heater returns water, the one-way valve is opened, and hot water of the water outlet pipe flows from the first water inlet and outlet to the second water inlet and outlet and returns to the water inlet pipe through the cold water pipe.

11. A water supply system with a water return pipe is characterized by comprising:

the water heater comprises a water inlet pipe and a water outlet pipe;

the water using end is connected with a hot water using pipe and a cold water using pipe, and the hot water using pipe is communicated with the water outlet pipe through a hot water pipe;

the water return valve according to claim 9, wherein the third water inlet and outlet is communicated with the water inlet pipe, and the first water inlet and outlet is communicated with the hot water pipe through a water return pipe;

the cold water source is communicated with the second water inlet and outlet and is communicated with the cold water using pipe through a cold water pipe;

when the water heater returns water, the one-way valve is opened, and water in the water return pipe flows to the third water inlet and outlet through the first water inlet and outlet.

12. A water heater, comprising: the water return valve of claim 9.