Water mixing device and gas water heating equipment

Abstract

The utility model belongs to the technical field of heating, specifically discloses a kind of water mixing device and gas hot water equipment. Water mixing device includes outer cylinder, end cap and inner tube. Outer cylinder is arranged in strip shape, and the first end of outer cylinder is open and the second end is provided with first water port;End cap is detachably mounted on outer cylinder and blocks the opening, and second water port is formed on end cap;Inner tube is inserted in outer cylinder, the first end of inner tube is in abutment with end cap and the second end is in abutment with the inner wall of the second end of outer cylinder, end cap and outer cylinder are enclosed to form water mixing cavity located on the outside of inner tube, the pipe wall of inner tube is spaced apart in length direction and is provided with multiple water passing holes, water passing hole and first water port are all communicated with water mixing cavity, and the inner cavity of inner tube is communicated with second water port and water passing hole. Gas hot water equipment includes the above water mixing device. The utility model can simplify the structure of water mixing device, improve the disassembly convenience of water mixing device, and reduce the cost of water mixing device.

Description

Technical Field

[0001] This utility model relates to the field of heating technology, and in particular to a mixing device and a gas-fired hot water equipment. Background Technology

[0002] Gas water heaters heat water flowing through a heat exchanger by exchanging heat between the high-temperature flue gas generated by gas combustion and the water in the heat exchanger. They have advantages such as high heating efficiency and low energy consumption.

[0003] Conventional gas water heaters suffer from temperature rise during water outages and temperature drop during restarts. To address this issue, existing technology provides a gas water heater with a mixing tank, which includes a tank body, an inlet pipe, an outlet pipe, and an isolator. The pipe body has an inlet and an outlet at opposite ends, each communicating with its internal cavity. The inlet pipe extends into the tank body through the inlet, and the outlet pipe extends into the tank body through the outlet. The isolator is installed inside the tank body and divides the internal cavity into multiple chambers. The isolator has a first through hole connecting these chambers. The inlet and outlet pipes are connected in series to the hot water outlet pipe of the heat exchanger, with the outlet end of the inlet pipe connected to the lowest chamber and the inlet end of the outlet pipe connected to the highest chamber.

[0004] The existing mixing tanks and gas water heaters use partitions to separate the chambers and connect them with the inlet and outlet pipes to increase the flow path of water within the mixing tank. However, the structure of the mixing tank is relatively complex, and multiple partitions need to be welded to the tank body, which is not conducive to the processing and assembly of the mixing tank. Utility Model Content

[0005] One of the technical problems solved by this utility model is to provide a water mixing device that can effectively solve the problem that the existing water mixing devices have complex structures and are not conducive to processing and assembly.

[0006] The second technical problem solved by this utility model is to provide a gas-fired water heater that can effectively solve the problem of increased cost due to the complex structure of the mixing device in the existing gas-fired water heater.

[0007] The first technical problem mentioned above is solved by the following technical solution:

[0008] A water mixing device, comprising:

[0009] The outer cylinder is elongated, with an open first end and a first water inlet at the second end.

[0010] An end cap is detachably installed on the outer cylinder and seals the opening; a second water inlet is provided on the end cap.

[0011] An inner tube is inserted into the outer cylinder. The first end of the inner tube abuts against the end cap, and the second end abuts against the inner wall of the second end of the outer cylinder. The end cap and the outer cylinder together form a mixing chamber located outside the inner tube. The inner tube wall is provided with a plurality of water passage holes at intervals along the length direction. The water passage holes and the first water outlet are both connected to the mixing chamber. The inner cavity of the inner tube is connected to the second water outlet and the water passage holes.

[0012] Compared with the prior art, the mixing device of this utility model has the following advantages: When the mixing device is applied to a gas-fired hot water equipment, the first and second water inlets are connected in series to the hot water outlet pipe, that is, one of the first and second water inlets is the inlet and the other is the outlet. The water entering the mixing device through the inlet can mix with the water in the mixing chamber and then flow out through the outlet, so that the water flowing out of the outlet is neither too cold nor too hot, improving the temperature uniformity of the water flowing out of the outlet, thereby mitigating the problems of temperature rise during water outages and temperature drop during secondary startups; Since the inner tube is inserted into the outer cylinder and its two ends abut against the inner wall of the outer cylinder and the end cap respectively, the inner tube does not need to be fixed by other structures, which simplifies the structure of the mixing device and reduces the cost of the mixing device. Furthermore, since the end cap is detachably connected to the outer cylinder, it is convenient to disassemble the end cap relative to the outer cylinder, realize the assembly and disassembly of the inner tube, and realize the cleaning of the inside of the outer cylinder, improving the ease of assembly and disassembly of the mixing device and enhancing the long-term performance of the mixing device.

[0013] In one embodiment, both the outer cylinder and the inner tube extend vertically;

[0014] The first end of the inner tube has a first notch, which connects the mixing chamber and the inner cavity of the inner tube; and / or, the second end of the inner tube has a second notch, which connects the mixing chamber and the inner cavity of the inner tube.

[0015] In one embodiment, the end cap has a first positioning groove on the side facing the mixing chamber, and the first end of the inner tube is inserted into the first positioning groove;

[0016] And / or, a second positioning groove is provided on the inner wall of the end of the outer cylinder opposite to the end cap, and the second end of the inner tube is inserted into the second positioning groove.

[0017] In one embodiment, the end cap protrudes from the side facing the mixing chamber and is provided with a first limiting protrusion. Multiple first limiting protrusions are provided at intervals along the circumference of the inner tube, and the multiple first limiting protrusions surround to form the first positioning groove.

[0018] The first end of the inner tube has a first notch, which connects the mixing chamber and the inner cavity of the inner tube. The first limiting protrusion and the first notch are offset in the circumferential direction of the inner tube.

[0019] In one embodiment, a second limiting protrusion is provided on the inner wall of the second end of the outer cylinder. Multiple second limiting protrusions are provided at intervals along the circumference of the inner tube, and the multiple second limiting protrusions surround to form the second positioning groove.

[0020] The second end of the inner tube has a second notch, which connects the mixing chamber and the inner cavity of the inner tube. The second limiting protrusion and the second notch are offset in the circumferential direction of the inner tube.

[0021] In one embodiment, the spacing between two adjacent water passages tends to increase along the direction away from the second water inlet in the length direction of the inner tube.

[0022] In one embodiment, one of the first water inlet and the second water inlet is a water inlet and the other is a water outlet, and the total water passage area of ​​all the water passage holes is smaller than the water passage area of ​​the water inlet.

[0023] In one embodiment, both the main structure of the outer cylinder and the inner tube are circular tube structures, and the outer cylinder and the inner tube are parallel to each other and spaced apart.

[0024] In one embodiment, a flow-turbing element is provided in the mixing chamber.

[0025] In one embodiment, the turbulence element is spirally coiled around the outside of the inner tube.

[0026] The second technical problem mentioned above is solved by the following technical solution:

[0027] A gas-fired hot water device includes a heat exchanger and a hot water outlet pipe connected to the outlet of the heat exchanger, and also includes a mixing device as described above, wherein the first outlet and the second outlet are connected in series to the hot water outlet pipe.

[0028] Compared with the prior art, the gas-fired water heater of this utility model has the following advantages: by adopting the above-mentioned mixing device, the structure of the gas-fired water heater can be simplified and the cost of the gas-fired water heater can be reduced when the water supply is interrupted and the temperature drops during the second start-up. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of a gas-fired water heater provided in Embodiment 1 of this utility model;

[0030] Figure 2This is a schematic diagram of the water mixing device provided in Embodiment 1 of this utility model;

[0031] Figure 3 This is a bottom view of the water mixing device provided in Embodiment 1 of this utility model;

[0032] Figure 4 for Figure 3 Sectional view along the middle AA direction;

[0033] Figure 5 for Figure 3 Sectional view along the BB direction;

[0034] Figure 6 A schematic diagram of water temperature fluctuations in the inlet, outlet and mixing chamber of the water mixing device provided in Embodiment 1 of this utility model;

[0035] Figure 7 A cross-sectional axial view of the water mixing device provided in Embodiment 1 of this utility model;

[0036] Figure 8 This is a cross-sectional view of the water mixing device provided in Embodiment 2 of this utility model.

[0037] Label Explanation:

[0038] 100. Mixing device; 200. Heat exchanger; 300. Hot water outlet pipe; 400. Cold water inlet pipe; 500. Flow meter; 600. Hot water temperature meter; 700. Cold water temperature meter; 800. Controller;

[0039] 1. Outer cylinder; 11. Main cylinder section; 12. Connector pipe section; 13. Second limiting protrusion; 14. First water inlet;

[0040] 2. Inner pipe; 21. Water passage hole; 22. First notch; 23. Second notch;

[0041] 3. End cap; 31. End plate; 32. Connecting pipe; 33. Surrounding edge; 34. First limiting protrusion; 35. Second sprue;

[0042] 4. Sealing components; 5. Mixing chamber; 6. Turbulence components. Detailed Implementation

[0043] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0044] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0045] 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. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0046] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0047] like Figures 1 to 4 As shown, this embodiment provides a mixing device 100 and a gas-fired water heater including the mixing device 100, so as to improve the mixing effect of hot and cold water in the mixing device 100, thereby reducing the temperature rise during water outage and the temperature drop during secondary start-up of the gas-fired water heater, and improving the ease of disassembly and assembly of the mixing device 100, and reducing processing costs.

[0048] Specifically, the gas-fired hot water equipment includes a heat exchanger 200, a combustion device, and a controller 800. The heat exchanger 200 has a cold water inlet pipe 400 connected to its inlet and a hot water outlet pipe 300 connected to its outlet. The combustion device is located below the heat exchanger 200 to generate high-temperature flue gas through gas combustion. This high-temperature flue gas flows upwards through the heat exchanger 200 and heats the water flowing through it. The resulting hot water flows to the water supply end through the hot water outlet pipe 300. A flow meter 500 is installed on the cold water inlet pipe 400 to detect the water flow rate entering the heat exchanger 200; a hot water temperature meter 600 is installed on the hot water outlet pipe 300 to detect the water temperature within the hot water outlet pipe 300; and a cold water temperature meter 700 is also installed on the cold water inlet pipe 400 to detect the temperature of the cold water inlet pipe 400. The combustion device, flow meter 500, hot water temperature meter 600, and cold water temperature meter 700 are all connected to the controller 800 so that the controller 800 can control the operation of the combustion device based on the flow and temperature detection results.

[0049] In this embodiment, the gas-fired water heater also includes a mixing device 100, which includes an outer cylinder 1, an inner pipe 2, and an end cap 3. The outer cylinder 1 is a long strip structure, with an open first end and a first water inlet 14 at the second end. The end cap 3 is detachably installed on the open end of the outer cylinder 1 and seals the open end. A second water inlet 35 is provided on the end cap 3. The inner pipe 2 is inserted into the outer cylinder 1, with its first end abutting against the end cap 3 and its second end abutting against the inner wall of the second end of the outer cylinder 1. The inner pipe 2 has water passage holes 21 spaced along its length. The end cap 3 and the outer cylinder 1 together form a mixing chamber 5 located outside the inner pipe 2. The first water inlet 14 and the water passage holes 21 are both connected to the mixing chamber 5. The inner cavity of the inner pipe 2 is connected to both the second water inlet 35 and the water passage holes 21.

[0050] In this embodiment, when the mixing device 100 is applied to a gas-fired water heater, the first water inlet 14 and the second water inlet 35 are connected in series to the hot water outlet pipe 300, that is, one of the first water inlet 14 and the second water inlet 35 is the inlet and the other is the outlet. Water entering the mixing device 100 through the inlet can mix with the water in the mixing chamber 5 before flowing out through the outlet. This prevents the water flowing out from the outlet from being too cold or too hot, improving the temperature uniformity of the water flowing out of the outlet and thus mitigating the problems of temperature rise during water outages and temperature drop during secondary startups. Since the inner tube 2 is inserted into the outer cylinder 1 and its two ends abut against the inner wall of the outer cylinder 1 and the end cap 3, respectively, the inner tube 2 does not need to be fixed by other structures, which simplifies the structure of the mixing device 100 and reduces its cost. Furthermore, since the end cap 3 is detachably connected to the outer cylinder 1, it facilitates the disassembly of the end cap 3 relative to the outer cylinder 1, enabling the assembly and disassembly of the inner tube 2 and the cleaning of the inside of the outer cylinder 1. This improves the ease of assembly and disassembly of the mixing device 100 and enhances its long-term performance.

[0051] like Figure 6 The diagram shows the water temperature fluctuation curves at the mixing chamber 5, the outlet, and the inlet. The horizontal axis represents time, and the vertical axis represents temperature. The solid line represents the inlet temperature fluctuation curve, the dashed line represents the mixing chamber 5 temperature fluctuation curve, and the double-line represents the outlet temperature fluctuation curve. Figure 5 As can be seen, the water mixing device 100 provided in this embodiment can significantly reduce the temperature fluctuation at the water outlet and effectively improve the uniformity of the water temperature.

[0052] like Figure 4 , Figure 5 and Figure 7 As shown, in one embodiment, the outer peripheral wall of the inner tube 2 is spaced apart from the cavity wall of the mixing chamber 5, thereby facilitating the flow of water between the outer peripheral walls of the outer cylinder 1 and improving the mixing effect. In another embodiment, one side of the inner tube 2 may also abut against the cavity wall of the mixing chamber 5.

[0053] In one embodiment, the second water inlet 35 is the inlet, and the first water inlet 14 is the outlet. Water first enters the inner pipe 2 through the inlet, then flows out through the water hole 21 into the mixing chamber 5, where it mixes with the water already there. The mixed water then flows out through the outlet. Setting the second water inlet 35 as the inlet allows water entering the inner pipe 2 to be sprayed into the mixing chamber 5 through the water hole 21, thus facilitating agitation and ensuring uniform mixing between the incoming water and the existing water in the mixing chamber 5. In other embodiments, the first water inlet 14 can be the inlet, and the second water inlet 35 can be the outlet.

[0054] In one embodiment, multiple water passage holes 21 are spaced apart along the length of the inner tube 2. This ensures the inflow and outflow of water while reducing the size of a single water passage hole 21, thus better ensuring the overall structural strength and rigidity of the inner tube 2 and facilitating the jet flow of water from the inner tube 2 to the mixing chamber 5.

[0055] To further improve the mixing uniformity, the spacing between two adjacent water passage holes 21 gradually increases along the length of the inner pipe 2 in the direction away from the second water outlet 35. This facilitates that after the water flows into the inner pipe 2, most of the water flows out through the water passage hole 21 near the second water outlet 35 to mix with the water in the mixing chamber 5, while some of the water flows out through the water passage hole 21 away from the second water outlet 35 to mix with the water in the mixing chamber 5. Since the water passage hole 21 near the second water outlet 35 is further away from the first water outlet 14, it can prevent the water flowing out of the water passage hole 21 from flowing directly out of the second water outlet 35 without being fully mixed with the mixing chamber 5, thereby improving the overall mixing uniformity.

[0056] The distance between two adjacent water passages 21 along the length of the inner tube 2 is d, where 5mm ≤ d ≤ 30mm. This spacing setting can further improve the mixing uniformity. Among them, d can be, but is not limited to, 5mm, 10mm, 15mm, 20mm, 25mm, and 30mm.

[0057] Preferably, multiple sets of water passage holes 21 are arranged at intervals along the circumference of the inner tube 2, and each set includes multiple water passage holes 21 arranged at intervals along the length of the inner tube 2, so as to further improve the mixing effect.

[0058] In one embodiment, the total water passage area of ​​all water passage holes 21 is smaller than that of the water inlet, thereby slowing down the flow rate of water from the inner pipe 2 to the mixing chamber 5, which helps to achieve uniform mixing of water in the mixing chamber 5.

[0059] In one embodiment, both the outer cylinder 1 and the inner tube 2 extend vertically, with the upper end of the inner tube 2 being the first end. The first end of the inner tube 2 has a first notch 22, which connects the inner cavity of the inner tube 2 with the mixing chamber 5, thereby facilitating the discharge of air from the inner tube 2 into the mixing chamber 5. Preferably, multiple first notches 22 are spaced apart along the circumference of the inner tube 2 to improve the exhaust effect.

[0060] The inner tube 2 has a second notch 23 at its second end. The second notch 23 connects the inner cavity of the inner tube 2 and the mixing chamber 5. The setting of the second notch 23 facilitates the complete drainage of water in the inner tube 2 and the mixing chamber 5, and facilitates the cleaning and maintenance of the mixing device 100.

[0061] In other embodiments, both the outer cylinder 1 and the inner tube 2 extend vertically, with the upper end of the inner tube 2 being the second end and the lower end of the inner tube 2 being the first end. In this case, the second notch 23 is used for venting air, and the first notch 22 is used to completely drain water.

[0062] To simplify the structure, in one embodiment, both the main structure of the outer cylinder 1 and the inner tube 2 are circular tubes, and the axes of the outer cylinder 1 and the inner tube 2 are parallel and spaced apart. This allows for a reduction in the floor space occupied by the mixing device 100 while ensuring the volume of the mixing chamber 5. In other embodiments, the cross-sectional shapes of the outer cylinder 1 and the inner tube 2 can also be elliptical or rectangular, etc.

[0063] To improve the connection convenience between the mixing device 100 and the hot water outlet pipe 300, in one embodiment, the outer cylinder 1 includes a main cylinder 11 with one end open, and a connector pipe 12 protruding from the end of the main cylinder 11 away from the open end, the inner cavity of the connector pipe 12 forming a first water outlet 14; the end cap 3 is detachably connected to the open end of the main cylinder 11, and the end cap 3 and the inner wall of the main cylinder 11 together form a mixing chamber 5, and the second end of the inner pipe 2 abuts against the main cylinder 11.

[0064] The end cap 3 includes an end plate portion 31, and a connecting pipe portion 32 is provided on the end plate portion 31 in a direction away from the mixing chamber 5. The second water outlet 35 passes through the connecting pipe portion 32 and the end plate portion 31, and the end plate portion 31 is connected to the outer cylinder 1. By providing the connecting pipe portion 32, the convenience of connecting the mixing device 100 to the hot water outlet pipe 300 is improved.

[0065] In one embodiment, the end plate portion 31 is inserted into the outer cylinder 1 and is press-fitted with the outer cylinder 1 to simplify the connection structure. In other embodiments, the outer peripheral wall of the end plate portion 31 is provided with external threads, and the inner wall of the outer cylinder 1 is provided with internal threads. The end cap 3 is screwed onto the outer cylinder 1 through the engagement of the external and internal threads. Furthermore, a periphery portion 33 is provided protruding from the periphery of the end plate portion 31. The periphery portion 33 increases the contact area between the end cap 3 and the outer cylinder 1, improves the installation stability and reliability of the end cap 3, and reduces the weight and cost of the end cap 3.

[0066] To reduce the risk of leakage at the connection between the end cap 3 and the outer cylinder 1, a sealing element 4 is provided between the outer peripheral wall of the end cap 3 and the inner wall of the outer cylinder 1 to seal the installation gap between them. Furthermore, an annular groove is formed on the outer peripheral wall of the end cap 3, and the sealing element 4 is installed in the annular groove to provide positioning for the installation of the sealing element 4.

[0067] To improve the installation stability of the inner tube 2 within the mixing chamber 5, in one embodiment, the end cap 3 has a first positioning groove on the side facing the mixing chamber 5, and the first end of the inner tube 2 is inserted into the first positioning groove; the inner wall of the outer cylinder 1 opposite to the end cap 3 is provided with a second positioning groove, and the second end of the inner tube 2 is inserted into the second positioning groove. By providing the first and second positioning grooves, positioning and limiting the installation of both ends of the inner tube 2 can be achieved, restricting the movement of the inner tube 2 relative to the outer cylinder 1 in a plane perpendicular to the axis of the inner tube 2, thereby improving the installation stability and reliability of the inner tube 2 within the outer cylinder 1. In another embodiment, only the first positioning groove or only the second positioning groove may be provided.

[0068] In one embodiment, the end cap 3 has a first limiting protrusion 34 protruding from the side facing the mixing chamber 5. Multiple first limiting protrusions 34 are spaced apart along the circumference of the inner tube 2, forming a first positioning groove. The first limiting protrusions 34 and the first notch 22 are staggered in the circumference of the inner tube 2. By setting multiple first limiting protrusions 34 to form the first positioning groove, it is beneficial to achieve the connection between the first notch 22 and the mixing chamber 5 and the inner tube 2, ensuring the effective opening area of ​​the first notch 22 and reducing the processing difficulty of the first notch 22.

[0069] In other embodiments, the first limiting protrusion 34 can be an annular structure, which surrounds and forms a first positioning groove. The first limiting protrusion 34 is provided with a water inlet that is directly opposite to and communicates with the first notch 22. Alternatively, the length of the first notch 22 is greater than the axial length of the first limiting protrusion 34, so that the first notch 22 is exposed outside the first limiting protrusion 34, thereby realizing the setting of the first notch 22 connecting the mixing chamber 5 and the inner cavity of the inner pipe 2.

[0070] In one embodiment, a second limiting protrusion 13 protrudes from the inner wall of the second end of the outer cylinder 1. Multiple second limiting protrusions 13 are spaced apart along the circumference of the inner tube 2, forming a second positioning groove. The second limiting protrusions 13 and the second notch 23 are offset from each other in the circumference of the inner tube 2. By setting multiple second limiting protrusions 13 to form the second positioning groove, it is beneficial to realize the connection between the second notch 23 and the mixing chamber 5 and the inner tube 2, better ensuring the effective opening area of ​​the second notch 23 and reducing the processing difficulty of the second notch 23.

[0071] In other embodiments, the second limiting protrusion 13 can be an annular structure, which surrounds and forms a second positioning groove. The second limiting protrusion 13 is provided with a water passage hole that communicates with the second notch 23. Alternatively, the length of the second notch 23 is greater than the axial length of the second limiting protrusion 13, so that the second notch 23 is exposed outside the second limiting protrusion 13.

[0072] Example 2

[0073] This embodiment provides a mixing device 100 and a gas-fired water heater including the mixing device 100. The mixing device 100 provided in this embodiment is a further improvement based on the mixing device 100 provided in the above embodiments. This embodiment will not repeat the same content as the above embodiments.

[0074] like Figure 8 As shown, in this embodiment, a flow disturbance element 6 is provided in the mixing chamber 5. The flow disturbance element 6 disturbs the water flow in the mixing chamber 5, thereby improving the mixing effect of the water in the mixing chamber 5 and further enhancing the uniformity of the water flow from the outlet.

[0075] To improve the ease of setting up the baffle 6, in this embodiment, the baffle 6 is spirally coiled around the outside of the inner tube 2, which can better turbulent the water flowing out of the inner tube 2, thereby improving the mixing effect of the water in the inner tube 2 after it flows into the mixing chamber 5; at the same time, this arrangement also helps to avoid the baffle 6 covering the inner tube 2.

[0076] The flow-disrupting element 6 can be a spring structure coiled around the inner tube 2, a spiral protrusion structure protruding from the outer wall of the inner tube 2, or a spiral strip structure that can be detachably or welded onto the inner wall of the outer cylinder 1. This utility model does not limit the specific structure of the flow-disrupting element 6. Existing tubular structures that can be used to disrupt water flow can all be applied to this utility model. This utility model does not limit or elaborate on this.

[0077] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0078] The specific embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A water mixing device, characterized by, include: The outer cylinder (1) is long and narrow, with an open first end and a first water inlet (14) at the second end. End cap (3) is detachably installed on the outer cylinder (1) and seals the opening. A second water inlet (35) is provided on the end cap (3). An inner tube (2) is inserted into the outer cylinder (1). The first end of the inner tube (2) abuts against the end cap (3) and the second end abuts against the inner wall of the second end of the outer cylinder (1). The end cap (3) and the outer cylinder (1) together form a mixing chamber (5) located outside the inner tube (2). The inner tube (2) has a plurality of water passage holes (21) spaced along its length. The water passage holes (21) and the first water outlet (14) are connected to the mixing chamber (5). The inner cavity of the inner tube (2) is connected to the second water outlet (35) and the water passage holes (21).

2. The device of claim 1, wherein Both the outer cylinder (1) and the inner tube (2) extend vertically; The first end of the inner tube (2) is provided with a first notch (22), which connects the mixing chamber (5) and the inner cavity of the inner tube (2); and / or, the second end of the inner tube (2) is provided with a second notch (23), which connects the mixing chamber (5) and the inner cavity of the inner tube (2).

3. The device of claim 1, wherein The end cap (3) has a first positioning groove on the side facing the mixing chamber (5), and the first end of the inner tube (2) is inserted into the first positioning groove; And / or, the inner wall of the outer cylinder (1) opposite to the end cap (3) is provided with a second positioning groove, and the second end of the inner tube (2) is inserted into the second positioning groove.

4. The device of claim 3, wherein The end cap (3) has a first limiting protrusion (34) protruding from the side facing the mixing chamber (5). Multiple first limiting protrusions (34) are provided at intervals along the circumference of the inner tube (2). Multiple first limiting protrusions (34) surround and form the first positioning groove. The first end of the inner tube (2) is provided with a first notch (22), the first notch (22) connects the mixing chamber (5) and the inner cavity of the inner tube (2), and the first limiting protrusion (34) and the first notch (22) are offset in the circumferential direction of the inner tube (2).

5. The device of claim 3, wherein The inner wall of the second end of the outer cylinder (1) is provided with a second limiting protrusion (13). Multiple second limiting protrusions (13) are provided at intervals along the circumference of the inner tube (2). Multiple second limiting protrusions (13) surround to form the second positioning groove. The second end of the inner tube (2) is provided with a second notch (23), which connects the mixing chamber (5) and the inner cavity of the inner tube (2). The second limiting protrusion (13) and the second notch (23) are offset in the circumferential direction of the inner tube (2).

6. The device of claim 1, wherein Along the length of the inner tube (2), the spacing between two adjacent water passages (21) tends to increase in the direction away from the second water inlet (35).

7. The device of claim 1, wherein One of the first water inlet (14) and the second water inlet (35) is a water inlet and the other is a water outlet. The total water passage area of ​​all the water passage holes (21) is smaller than the water passage area of ​​the water inlet.

8. The device of any one of claims 1-7, wherein, The main structure of the outer cylinder (1) and the inner tube (2) are both circular tube structures. The outer cylinder (1) and the inner tube (2) are parallel to each other and spaced apart.

9. The device of any one of claims 1-7, wherein, A flow-disrupting element (6) is provided in the mixing chamber (5).

10. The device of claim 9, wherein The turbulence-disrupting element (6) is spirally coiled around the outside of the inner tube (2).

11. A gas water heating apparatus comprising a heat exchanger (200) and a hot water outlet pipe (300) connected to a hot water outlet of the heat exchanger (200), characterized in that, It also includes a mixing device as described in any one of claims 1-10, wherein the first water inlet (14) and the second water inlet (35) are connected in series to the hot water outlet pipe (300).

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