Water mixing device and heating system

Abstract

The utility model provides a water mixing device and a heating system, and relates to the technical field of heating systems. The water mixing device comprises a heat exchanger, a coupling tank and a pumping and draining piece. The heat exchanger is provided with a primary side heat exchange water inlet, a primary side heat exchange water outlet, a secondary side heat exchange water outlet and a secondary side heat exchange water inlet. The coupling tank is provided with a primary side coupling water inlet, a primary side coupling water outlet, a secondary side coupling water outlet and a secondary side coupling water inlet; the pumping and draining part is provided with a water suction port and a water drainage port and used for pumping heating water, and the water suction port communicates with the secondary side heat exchange water outlet and the secondary side coupling water outlet. Concentrated heating and wall-hanging stove heating can be compatible, limitation of a single heat source is eliminated, and the heating requirements of concentrated heating and wall-hanging stove heating are met.

Description

Technical Field

[0001] This application relates to the field of heating system technology, and in particular to a mixing device and a heating system. Background Technology

[0002] With the continuous development of heating technology, users have placed higher demands on the flexibility, energy efficiency, and safety of heating systems. Most heating equipment on the market can only meet the heating needs of a single heat source, such as being suitable only for central heating or wall-mounted boiler heating. This is because different heat sources have different requirements, and the performance of mixing devices shared by central heating and wall-mounted boiler heating is poor when multiple heat sources coexist. For example, if high-temperature, high-pressure hot water from a central heating system directly enters a home heating system, it can easily lead to pipe bursts or system damage; at the same time, impurities in the central heating system can easily clog home heating systems, affecting their service life. Utility Model Content

[0003] In view of this, the purpose of this application is to overcome the shortcomings of the prior art and provide a mixing device and heating system that is compatible with both centralized heating and wall-hung boiler heating, thus overcoming the limitation of a single heat source and meeting the heating needs of both centralized heating and wall-hung boiler heating.

[0004] This application provides the following technical solution:

[0005] In a first aspect, embodiments of this application provide a water mixing device, the water mixing device comprising:

[0006] A heat exchanger having a primary heat exchange inlet, a primary heat exchange outlet, a secondary heat exchange outlet, and a secondary heat exchange inlet.

[0007] A coupling tank, the coupling tank having a primary-side coupling inlet, a primary-side coupling outlet, a secondary-side coupling outlet, and a secondary-side coupling inlet;

[0008] The pumping component has a water inlet and a water outlet, and is used to pump heating water. The water inlet is connected to the secondary heat exchange outlet and the secondary coupling outlet, respectively.

[0009] In some embodiments of the first aspect, the mixing device further includes:

[0010] A reversing component has a first inlet, a second inlet, and an outlet. The first inlet is connected to the secondary heat exchange outlet, the second inlet is connected to the secondary coupling outlet, and the outlet is connected to the suction port of the pumping component. The reversing component can switch between at least a first state and a second state.

[0011] In the first state, the outlet and the first inlet are connected; in the second state, the outlet and the second inlet are connected.

[0012] In some embodiments of the first aspect, the reversing element includes a three-way reversing valve having a pair of inlets and outlets;

[0013] One of the inlets is connected to the first water inlet, the other inlet is connected to the second water inlet, and the outlet is connected to the water outlet.

[0014] In some embodiments of the first aspect, the mixing device further includes:

[0015] The integrated lower bar has a first lower bar inlet, a second lower bar inlet, and a lower bar return inlet. The first lower bar inlet and the second lower bar inlet are respectively connected to the lower bar return inlet. The first lower bar inlet is connected to the secondary side heat exchange inlet, and the second lower bar inlet is connected to the secondary side coupling inlet.

[0016] In some embodiments of the first aspect, the mixing device further includes a transfer pipe, the integrated lower bar having a through-mounted installation channel, the transfer pipe passing through the installation channel, and one end of the transfer pipe communicating with the drain outlet.

[0017] In some embodiments of the first aspect, the integrated lower lever has a mixing chamber and a temperature sensing element, wherein the first lower lever inlet and the second lower lever inlet are respectively connected to the lower lever return port through the mixing chamber, and the temperature sensing element is used to obtain the temperature inside the mixing chamber.

[0018] In some embodiments of the first aspect, both the extraction element and the reversing element are located between the heat exchanger and the coupling tank.

[0019] In some embodiments of the first aspect, an exhaust valve is connected to the top of the coupling tank and a pressure relief valve is connected to the bottom of the coupling tank.

[0020] In some embodiments of the first aspect, the heat exchanger is configured as a plate heat exchanger.

[0021] Secondly, this application also provides a heating system, the heating system comprising:

[0022] The mixing device as described in any of the above embodiments;

[0023] A centralized heating heat source, wherein the water supply port of the centralized heating heat source is connected to the primary heat exchange inlet, and the water return port of the centralized heating heat source is connected to the primary heat exchange outlet.

[0024] The wall-hung boiler is a heat source for heating, and the water supply port of the wall-hung boiler is connected to the primary side coupling inlet. The return port of the centralized heating source is connected to the primary side coupling outlet.

[0025] A hot water pipe network, wherein the inlet of the hot water pipe network is connected to the outlet, and the return outlet of the hot water pipe network is connected to the return outlet of the lower bar.

[0026] The embodiments of this application have the following advantages:

[0027] This application provides a mixing device that, by introducing a heat exchanger and a coupling tank, connects centralized heating to the mixing device via the heat exchanger, while simultaneously connecting wall-mounted boiler heating to the mixing device via the coupling tank. This effectively isolates and regulates hot water from different heat sources, preventing high-temperature, high-pressure hot water from directly entering the home heating system, and also isolates impurities from the centralized heating system, thereby avoiding the risks of pipe bursts, system damage, and blockages in the home heating system. Furthermore, the pumping mechanism allows for flexible adjustment of the water supply, ensuring stable operation of the entire system and extending its service life.

[0028] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This illustration shows a schematic diagram of the structure of a water mixing device provided in an embodiment of this application.

[0031] Explanation of key component symbols:

[0032] 100 - Heat exchanger; 110 - Primary side heat exchange inlet; 120 - Primary side heat exchange outlet; 130 - Secondary side heat exchange outlet; 140 - Secondary side heat exchange inlet; 200 - Reversing component; 210 - First inlet; 220 - Second inlet; 300 - Coupling tank; 310 - Secondary side coupling outlet; 320 - Primary side coupling inlet; 330 - Primary side coupling outlet; 340 - Secondary side coupling inlet; 400 - Pressure relief valve; 500 - Air vent valve; 600 - Extraction / extraction component; 700 - Integrated lower lever; 710 - Lower lever return port; 800 - Transfer pipe. Detailed Implementation

[0033] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0034] It should be noted that when an element is said to be "fixed" to another element, it can be directly on the other element or there may be an intervening element. When an element is said to be "connected" to another element, it can be directly connected to the other element or there may be an intervening element. Conversely, when an element is said to be "directly" on another element, there is no intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0035] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the template description is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0038] In related technologies, with the continuous development of heating technology, users have placed higher demands on the flexibility, energy efficiency, and safety of heating systems. Most heating equipment on the market can only meet the heating needs of a single heat source, such as being suitable only for centralized heating or wall-mounted boiler heating. This is because different heat sources have different requirements, and the performance of mixing devices shared by centralized heating and wall-mounted boiler heating is poor when multiple heat sources coexist. For example, if high-temperature, high-pressure hot water from a centralized heating system directly enters a household heating system, it can easily lead to pipe bursts or system damage; at the same time, impurities in the centralized heating system can easily clog household heating systems, affecting their service life.

[0039] As shown in Figure 1, in order to solve the above-mentioned technical problems, this application provides a water mixing device, which includes a heat exchanger 100, a coupling tank 300, and a pumping component 600. The heat exchanger 100 has a primary heat exchange inlet 110, a primary heat exchange outlet 120, a secondary heat exchange outlet 130, and a secondary heat exchange inlet 140. The coupling tank 300 has a primary coupling inlet 320, a primary coupling outlet 330, a secondary coupling outlet 310, and a secondary coupling inlet 340. The pumping component 600 has a suction port and a discharge port. The pumping component 600 is used to pump heating water, and the suction port is connected to the secondary heat exchange outlet 130 and the secondary coupling outlet 310, respectively.

[0040] These embodiments feature innovative mixing devices designed to address the limitations of existing heating systems, enabling compatibility with different heat source types, such as district heating and wall-mounted boilers. The key components and functions of this mixing device are as follows:

[0041] The heat exchanger 100 has four ports: a primary side heat exchange inlet 110, a primary side heat exchange outlet 120, a secondary side heat exchange outlet 130, and a secondary side heat exchange inlet 140. Through these ports, the heat exchanger 100 can effectively transfer heat between water flows under different temperature or pressure conditions, thereby protecting the safety of the home heating system and improving its efficiency. Specifically, the primary side heat exchange inlet 110 of the heat exchanger 100 is connected to the central heating system's water supply port, and the primary side heat exchange outlet 120 is connected to the central heating system's return water port.

[0042] For example, the heat exchanger 100 may be a shell-and-tube heat exchanger 100, a plate heat exchanger 100, a finned tube heat exchanger 100, or a spiral plate heat exchanger 100, etc.

[0043] The coupling tank 300 also has four interfaces: a primary-side coupling inlet 320, a primary-side coupling outlet 330, a secondary-side coupling outlet 310, and a secondary-side coupling inlet 340. The primary-side coupling inlet 320 is connected to the water supply port of the wall-hung boiler, and the primary-side coupling outlet 330 is connected to the return port of the wall-hung boiler. The function of the coupling tank 300 is to balance and coordinate the water supply from the heat source of the wall-hung boiler, ensuring the stable operation of the entire heating system and avoiding problems caused by differences in heat sources.

[0044] For example, the coupling tank 300 can be a general coupling tank 300, a regenerative coupling tank 300, or a layered coupling tank 300, etc.

[0045] The pumping unit 600 consists of two parts: a water inlet and a water outlet, and is mainly responsible for pumping heating water. The water inlet is connected to the secondary side heat exchange outlet 130 of the heat exchanger 100 and the secondary side coupling outlet 310 of the coupling tank 300. This allows for more flexible control and optimization of the water circulation of the entire system, ensuring efficient and stable heating performance.

[0046] For example, the pumping unit 600 can be a centrifugal pump, submersible pump, pipeline pump, positive displacement pump, or variable frequency pump, etc.

[0047] Clearly, through the aforementioned structure, this mixing device effectively overcomes the limitation of traditional heating equipment that can only support a single heat source, allowing users to freely select or switch between different heat sources as needed, while ensuring the system's safety, flexibility, and energy efficiency. This provides strong support for improving the comfort of the living environment. Specifically, when using only centralized heating, the heat exchanger 100 indirectly connects the centralized heating to the indoor hot water network, preventing the hot water from the centralized heating from directly entering the hot water network and coupling tank 300. When using only a wall-hung boiler for heating, the coupling tank 300 directly connects the boiler's heating to the indoor hot water network. Of course, if centralized heating alone cannot meet the heating needs (temperature too low), both the wall-hung boiler and centralized heating can be used simultaneously to improve the indoor heating effect. It should be noted that since the centralized heating is indirectly connected to the exhaust unit 600 through the heat exchanger 100, it will not damage the coupling tank 300 or the wall-hung boiler's heating.

[0048] In some embodiments, the mixing device further includes a reversing member 200, which has a first inlet 210, a second inlet 220, and an outlet. The first inlet 210 is connected to the secondary heat exchange outlet 130, the second inlet 220 is connected to the secondary coupling outlet 310, and the outlet is connected to the suction port of the pumping unit 600. The reversing member 200 can switch between at least a first state and a second state. In the first state, the outlet is connected to the first inlet 210; in the second state, the outlet is connected to the second inlet 220.

[0049] In these embodiments, the mixing device further enhances its flexibility and controllability by adding a reversing element 200. The reversing element 200 has three main interfaces: a first inlet 210, a second inlet 220, and an outlet. The first inlet 210 is connected to the secondary-side heat exchange outlet 130 of the heat exchanger 100. The second inlet 220 is connected to the secondary-side coupling outlet 310 of the coupling tank 300, and the outlet is connected to the suction port of the extraction / discharge unit 600.

[0050] First state: In this state, the outlet is connected to the first inlet 210. This means that after the water flows out from the secondary side of the heat exchanger 100, it flows directly out through the outlet of the reversing component 200 and enters the extraction component 600. This is suitable for situations where hot water heated by the heat exchanger 100 needs to be used directly, i.e., connected to a centralized heating system.

[0051] Second state: In this state, the outlet is connected to the second inlet 220. In this way, water can enter from the secondary side of the coupling tank 300 and flow out through the outlet of the reversing component 200, and enter the extraction component 600, which is suitable for adjusting the connection to different heat sources, i.e., connecting to a wall-mounted boiler for heating.

[0052] Clearly, allowing the mixing device to flexibly select different water sources according to actual needs ensures the efficient operation of the system. For example, in some cases, it is preferable to use hot water provided by the wall-mounted boiler; while in other cases, hot water from the central heating system is required. By switching between at least two states, the commutator 200 provides the necessary hardware support for achieving these operations.

[0053] For example, the reversing component 200 can be a three-way ball valve, a three-way butterfly valve, an electric three-way valve, or a manual three-way reversing valve, etc.

[0054] In some embodiments, the reversing element 200 includes a three-way reversing valve having a pair of inlets and outlets; wherein one inlet is connected to a first inlet 210, the other inlet is connected to a second inlet 220, and the outlet is connected to an outlet.

[0055] In these embodiments, the reversing element 200 employs a three-way reversing valve, suitable for applications requiring switching or mixing between two different water flow sources. Specifically, one inlet is connected to the first inlet 210 (connected to the secondary side heat exchange outlet 130 of the heat exchanger 100); the other inlet is connected to the second inlet 220 (connected to the secondary side coupling outlet 310 of the coupling tank 300); and the outlet is connected to the outlet of the reversing element 200.

[0056] First state: When the three-way reversing valve is in the first state, water from the first inlet 210 is allowed to flow through and out of the outlet, while water from the second inlet 220 is blocked. This setting is suitable for situations where hot water heated by the heat exchanger 100 is used directly.

[0057] Second state: When the three-way reversing valve is switched to the second state, it will allow water to flow through from the second inlet 220 and out from the outlet, while blocking water flow from the first inlet 210. This situation is typically used when hot water from the coupling tank 300 is required.

[0058] The use of a three-way reversing valve as the switching element 200 provides flexibility to the mixing device, allowing the system to select the appropriate water source according to actual needs. This design can effectively meet heating requirements under different conditions, such as adjusting the supply water temperature according to changes in outdoor temperature, or switching the heat source according to the needs of different time periods, thereby achieving energy saving and improving comfort.

[0059] In addition, the choice of a three-way directional valve also depends on its specific type (such as manual, electric or pneumatic), which will affect the degree of automation and ease of operation of the system.

[0060] In some embodiments, the mixing device further includes an integrated lower lever 700, which has a first lower lever inlet, a second lower lever inlet, and a lower lever return outlet 710. The first lower lever inlet and the second lower lever inlet are respectively connected to the lower lever return outlet 710. The first lower lever inlet is connected to the secondary side heat exchange inlet 140, and the second lower lever inlet is connected to the secondary side coupling inlet 340.

[0061] In these embodiments, the mixing device further includes an integrated lower lever 700, which refers to a distribution component that integrates multiple functions or interfaces to enhance the flexibility and functionality of the system.

[0062] Both the first and second lower bar inlets are connected to the lower bar return inlet 710, forming a water circulation path. The first lower bar inlet is connected to the secondary side heat exchange inlet 140 of the heat exchanger 100. The second lower bar inlet is connected to the secondary side coupling inlet 340 of the coupling tank 300.

[0063] By integrating the lower lever 700, water flow from different sources can be managed and distributed more flexibly. For example, when it is necessary to send treated hot water into the heat exchanger 100 or the coupling tank 300, the direction and flow rate of the water can be controlled by adjusting the integrated lower lever 700.

[0064] Clearly, whether using centralized heating or a wall-mounted boiler, the hot water from the indoor hot water network is returned to the coupling tank 300 or heat exchanger 100 via the integrated lower lever 700. At the same time, the overall structure is simpler and allows for a reduction in the size of the entire mixing device.

[0065] In some embodiments, the mixing device further includes a transfer pipe 800, the integrated lower lever 700 having a through-mounted installation channel, the transfer pipe 800 passing through the installation channel, and one end of the transfer pipe 800 communicating with a drain outlet.

[0066] In these embodiments, the mixing device further integrates a transfer pipe 800, which connects to the drain outlet via an installation channel on the integrated lower lever 700.

[0067] In other words, in addition to the previously mentioned first lower bar inlet, second lower bar inlet, and lower bar return inlet 710, the integrated lower bar 700 also has a through-type installation channel. This installation channel is prepared for use with the adapter pipe 800.

[0068] The adapter pipe 800 passes through the installation channel of the integrated lower lever 700, and one end of it is connected to the drain port of the extraction component 600. This design allows for more flexible configuration of the water flow path within the system, facilitating adjustments to the connection methods between different components according to actual needs. Furthermore, by avoiding the stacking of the adapter pipe 800 and the integrated lower lever 700, the size and thickness of the mixing device can be reduced.

[0069] Furthermore, the adapter pipe 800 can be fixed and limited through the installation channel, which facilitates subsequent installation, meaning that no additional fixing structure (such as clamps, bolts, etc.) is required to fix the adapter pipe 800.

[0070] In some embodiments, the integrated lower lever 700 has a mixing chamber and a temperature detection device, the first lower lever inlet and the second lower lever inlet are respectively connected to the lower lever return port 710 through the mixing chamber, and the temperature detection device is used to obtain the temperature in the mixing chamber.

[0071] In these embodiments, the integrated lower lever 700 adds a mixing chamber and a temperature sensing element. This design further enhances the system's controllability and efficiency, enabling more precise mixing and temperature regulation of the water flow.

[0072] The mixing chamber is a region inside the integrated lower lever 700. The first and second lower lever inlets are connected to the lower lever return port 710 through this mixing chamber. This allows water flows from different sources (such as heat exchanger 100 and coupling tank 300) to be fully mixed in the mixing chamber, thereby achieving a more uniform and stable water temperature output.

[0073] Temperature sensors are used to acquire real-time water temperature information within the mixing chamber. By monitoring the temperature within the mixing chamber, it can be ensured that the water temperature output to the heating system meets the set requirements, which is crucial for improving heating efficiency and comfort.

[0074] Clearly, the system can better control the final hot water temperature delivered to the user. Combined with real-time data from temperature sensors, the ratio of hot and cold water entering the mixing chamber can be dynamically adjusted to achieve the ideal water supply temperature.

[0075] For example, the temperature sensing element can be a temperature gauge, thermometer, infrared temperature sensor, or semiconductor temperature sensor, etc.

[0076] In some embodiments, both the extraction component 600 and the reversing component 200 are located between the heat exchanger 100 and the coupling tank 300.

[0077] In these embodiments, both the exhaust element 600 and the reversing element 200 are located between the heat exchanger 100 and the coupling tank 300. This layout design has clear functional and structural advantages.

[0078] The extraction unit 600 is located between the heat exchanger 100 and the coupling tank 300, and its suction port is connected to the secondary side heat exchange outlet 130 of the heat exchanger 100 and the secondary side coupling outlet 310 of the coupling tank 300, respectively. This arrangement allows the extraction unit 600 to flexibly extract water from the heat exchanger 100 or the coupling tank 300 and transport it to other parts of the system.

[0079] The reversing component 200 is also located between the heat exchanger 100 and the coupling tank 300, and is used to control the direction of water flow. Its first inlet 210 is connected to the secondary side heat exchange outlet 130 of the heat exchanger 100, and its second inlet 220 is connected to the secondary side coupling outlet 310 of the coupling tank 300. The outlet guides the water flow to the target area of ​​the system (such as the heating terminal).

[0080] Obviously, by arranging the extraction component 600 and the reversing component 200 together between the heat exchanger 100 and the coupling tank 300, the entire mixing device can be made more compact, reducing the complexity of pipeline connections and lowering installation and maintenance costs.

[0081] In some embodiments, an exhaust valve 500 is connected to the top of the coupling tank 300, and a pressure relief valve 400 is connected to the bottom of the coupling tank 300.

[0082] In these embodiments, an air vent valve 500 is installed at the top of the coupling tank 300, and a pressure relief valve 400 is installed at the bottom. This design is crucial for ensuring the safe operation and stability of the system. The main function of the air vent valve 500 is to expel air from the system. In heating systems, air can enter the piping system through various means, such as during water replenishment or changes in gas solubility caused by temperature variations. Excessive air in the system can lead to problems such as poor water flow, increased noise, and reduced heat exchange efficiency.

[0083] The vent valve 500 is typically designed for automatic operation. It can automatically open to vent air when air accumulation is detected, and automatically close after the air is exhausted to prevent water leakage.

[0084] The pressure relief valve 400 is used to prevent excessive pressure within the system. In heating systems, factors such as fluid expansion due to rising temperatures or pump malfunctions may cause the internal pressure to exceed safe limits. Once the system pressure exceeds a set value, the pressure relief valve 400 will automatically open to release the excess pressure, thereby protecting the system from damage and preventing potential leaks or explosions.

[0085] In some embodiments, this application also provides a heating system, which includes a mixing device as described in any of the above embodiments, a centralized heating source, a wall-hung boiler heating source, and a hot water pipe network. The supply port of the centralized heating source is connected to the primary side heat exchange inlet 110, and the return port of the centralized heating source is connected to the primary side heat exchange outlet 120. The supply port of the wall-hung boiler heating source is connected to the primary side coupling inlet 320, and the return port of the centralized heating source is connected to the primary side coupling outlet 330. The pipe network inlet of the hot water pipe network is connected to the outlet, and the pipe network return port of the hot water pipe network is connected to the lower bar return port 710.

[0086] In these embodiments, since the mixing device has the above-mentioned technical effects, the heating system including the mixing device should have the same technical effects, which will not be repeated here.

[0087] In all examples shown and described herein, any specific values ​​should be interpreted as merely exemplary and not as limitations; therefore, other examples of exemplary embodiments may have different values.

[0088] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0089] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the protection scope of this application.

Claims

1. A water mixing device, characterized by, The water mixing device comprises: a heat exchanger having a primary-side heat exchange water inlet, a primary-side heat exchange water outlet, a secondary-side heat exchange water outlet and a secondary-side heat exchange water inlet; a coupling tank having a primary-side coupling water inlet, a primary-side coupling water outlet, a secondary-side coupling water outlet and a secondary-side coupling water inlet; a pumping member having a water suction inlet and a water discharge outlet, the pumping member being configured to pump heating water, the water suction inlet being in communication with the secondary-side heat exchange water outlet and the secondary-side coupling water outlet, respectively.

2. The device of claim 1, wherein The water mixing device further comprises: a switching member having a first water inlet, a second water inlet and a water outlet, the first water inlet being in communication with the secondary-side heat exchange water outlet, the second water inlet being in communication with the secondary-side coupling water outlet, and the water outlet being in communication with the water suction inlet of the pumping member, the switching member being switchable between at least a first state and a second state; wherein, in the first state, the water outlet is in communication with the first water inlet; and in the second state, the water outlet is in communication with the second water inlet.

3. The device of claim 2, wherein The switching member comprises a three-way switching valve having a pair of inlets and an outlet; wherein one of the inlets is in communication with the first water inlet, the other of the inlets is in communication with the second water inlet, and the outlet is in communication with the water outlet.

4. The device of claim 2, wherein The water mixing device further comprises: an integrated lower rod having a first lower rod water inlet, a second lower rod water inlet and a lower rod water return outlet, the first lower rod water inlet and the second lower rod water inlet being in communication with the lower rod water return outlet, respectively, the first lower rod water inlet being in communication with the secondary-side heat exchange water inlet, and the second lower rod water inlet being in communication with the secondary-side coupling water inlet.

5. The device of claim 4, wherein The water mixing device further comprises an adapter pipe, the integrated lower rod having a mounting channel arranged therethrough, the adapter pipe being arranged in the mounting channel, one end of the adapter pipe being in communication with the water discharge outlet.

6. The device of claim 5, wherein The integrated lower rod has a mixing chamber and a temperature detecting member, the first lower rod water inlet and the second lower rod water inlet being in communication with the lower rod water return outlet through the mixing chamber, respectively, the temperature detecting member being configured to obtain a temperature in the mixing chamber.

7. The device of claim 5, wherein The pumping member and the switching member are located between the heat exchanger and the coupling tank.

8. The device of claim 1, wherein The coupling tank is connected with an exhaust valve at a top portion thereof and a pressure relief valve at a bottom portion thereof.

9. The device of claim 1, wherein The heat exchanger is a plate heat exchanger.

10. A heating system, characterised in that, The heating system comprises: the water mixing device according to any one of claims 1 to 9; a central heating heat source, a water supply outlet of the central heating heat source being in communication with the primary-side heat exchange water inlet, and a water return outlet of the central heating heat source being in communication with the primary-side heat exchange water outlet; a wall-hanging stove heating heat source, a water supply outlet of the wall-hanging stove heating heat source being in communication with the primary-side coupling water inlet, and a water return outlet of the wall-hanging stove heating heat source being in communication with the primary-side coupling water outlet; a hot water pipe network, a pipe network inlet of the hot water pipe network being in communication with the water outlet, and a pipe network water return outlet of the hot water pipe network being in communication with the secondary-side heat exchange water inlet and the secondary-side coupling water inlet, respectively.

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