Gas water heating device

Abstract

The utility model discloses a gas water heating device which comprises a combustion device, an inner container and a heat exchange structure arranged in the inner container, a smoke outlet of the combustion device is communicated with an inlet of the heat exchange structure, and smoke generated by combustion of the combustion device can flow into the heat exchange structure so as to conduct heat exchange with water in the inner container through the heat exchange structure. The heat exchange structure comprises an upper heat exchange coil pipe and a lower heat exchange coil pipe which are vertically arranged in the height direction, the upper heat exchange coil pipe and the lower heat exchange coil pipe are arranged in parallel, smoke in the upper heat exchange coil pipe is used for conducting heat exchange with water on the upper portion of the inner container, and smoke in the lower heat exchange coil pipe is used for conducting heat exchange with water on the lower portion of the inner container. According to the gas water heating device, it can be guaranteed that the gas water heating device has enough heat exchange amount, the uniformity of the upper water temperature and the lower water temperature of the inner container is improved, the size can be reduced, the cost is reduced, in addition, the requirement for coil pipe manufacturing equipment is low, and large-scale low-cost batch production is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of volumetric water heaters, in particular to a gas-fired water heater. Background Art

[0002] Existing positive displacement gas water heaters primarily consist of an inner tank, a combustion device, and a heat exchanger. Commonly used heat exchangers are typically single-coil heat exchangers. Specifically, this single-coil heat exchanger may include a single coil arranged spirally along the axial direction of the inner tank. However, to meet the required heat exchange capacity, this single-coil structure requires a relatively large overall size, high cost, and very demanding manufacturing equipment.

[0003] Therefore, it is necessary to provide a gas water heater to solve at least one of the above problems. Utility Model Content

[0004] In response to the defects of the existing technology, a gas water heater is provided in the embodiment of the present invention, which not only ensures that the gas water heater has sufficient heat exchange and improves the uniformity of the water temperature above and below the inner tank, but also reduces the size and reduces the cost. In addition, the equipment requirements for manufacturing the coil are also low, which is conducive to large-scale and low-cost batch production.

[0005] The specific technical solution of the embodiment of the utility model is:

[0006] A gas water heater, comprising: a combustion device, an inner tank and a heat exchange structure arranged in the inner tank, wherein the flue gas outlet of the combustion device is connected to the inlet of the heat exchange structure, and the flue gas generated by combustion in the combustion device can flow into the heat exchange structure to exchange heat with the water in the inner tank through the heat exchange structure; the heat exchange structure comprises an upper heat exchange coil and a lower heat exchange coil arranged up and down along the height direction, the upper heat exchange coil and the lower heat exchange coil are arranged in parallel, the flue gas in the upper heat exchange coil is used to exchange heat with the water in the upper part of the inner tank, and the flue gas in the lower heat exchange coil is used to exchange heat with the water in the lower part of the inner tank.

[0007] In a preferred embodiment, the heat exchange rate between the flue gas in the lower heat exchange coil and the water in the lower part of the inner tank is greater than the heat exchange rate between the flue gas in the upper heat exchange coil and the water in the upper part of the inner tank.

[0008] In a preferred embodiment, the product of the heat transfer coefficient and the heat transfer area of ​​the lower heat exchange coil is greater than the product of the heat transfer coefficient and the heat transfer area of ​​the upper heat exchange coil.

[0009] In a preferred embodiment, the ratio of the pitch of the upper heat exchange coil to the pitch of the lower heat exchange coil is less than the product of the ratio of the median diameter of the lower heat exchange coil to the median diameter of the upper heat exchange coil, the ratio of the number of turns of the lower heat exchange coil to the number of turns of the upper heat exchange coil, and the ratio of the cube of the tube diameter of the lower heat exchange coil to the cube of the tube diameter of the upper heat exchange coil.

[0010] In a preferred embodiment, the diameter of the upper heat exchange coil is equal to the diameter of the lower heat exchange coil; the median diameter of the upper heat exchange coil is larger than the median diameter of the lower heat exchange coil; the number of turns of the upper heat exchange coil is smaller than the number of turns of the lower heat exchange coil; and the pitch of the upper heat exchange coil is smaller than the pitch of the lower heat exchange coil.

[0011] In a preferred embodiment, the diameter of the upper heat exchange coil is equal to the diameter of the lower heat exchange coil; the median diameter of the upper heat exchange coil is equal to the median diameter of the lower heat exchange coil; the number of turns of the upper heat exchange coil is equal to the number of turns of the lower heat exchange coil; and the pitch of the upper heat exchange coil is smaller than the pitch of the lower heat exchange coil.

[0012] In a preferred embodiment, the upper heat exchange coil has a first inlet and a first outlet, the lower heat exchange coil has a second inlet and a second outlet, and the first outlet and the second outlet are connected via a confluence portion.

[0013] In a preferred embodiment, the confluence portion is a tee joint.

[0014] In a preferred embodiment, at least part of the three-way joints are arranged tilted from top to bottom in the height direction.

[0015] In a preferred embodiment, the inclination angle of the terminal coil of the lower heat exchange coil at the lowest position connected to the tee joint is greater than the inclination angle of the coils located above the terminal coil.

[0016] In a preferred embodiment, the combustion device includes a combustion chamber, the combustion chamber includes a first flue gas outlet and a second flue gas outlet, the upper heat exchange coil has a first inlet and a first outlet, the lower heat exchange coil has a second inlet and a second outlet, the first inlet is connected to the first flue gas outlet, and the second inlet is connected to the second flue gas outlet.

[0017] In a preferred embodiment, the combustion device includes a combustion chamber, which is provided with a flue gas outlet, the upper heat exchange coil has a first inlet and a first outlet, the lower heat exchange coil has a second inlet and a second outlet, and the first inlet and the second inlet are both connected to the flue gas outlet.

[0018] In a preferred embodiment, the upper heat exchange coil has a first inlet and a first outlet, and an outlet section extending as a whole in the height direction is provided downstream of the first outlet of the upper heat exchange coil, and the outlet section is located on the inner side or the outer side of the lower heat exchange coil.

[0019] In a preferred embodiment, the median diameter of the upper heat exchange coil is larger than the median diameter of the lower heat exchange coil, and the outlet section is located outside the lower heat exchange coil.

[0020] In a preferred embodiment, the lower heat exchange coil has a second inlet and a second outlet, and an inlet section extending as a whole along the height direction is provided upstream of the second inlet of the lower heat exchange coil, and the inlet section is located on the inner side or the outer side of the upper heat exchange coil.

[0021] In a preferred embodiment, the median diameter of the lower heat exchange coil is smaller than the median diameter of the upper heat exchange coil, and the inlet section is located on the inner side of the upper heat exchange coil.

[0022] In a preferred embodiment, the combustion device includes a combustion chamber, and the combustion chamber is located in the inner container or outside the inner container.

[0023] In a preferred embodiment, the combustion chamber is located in the inner liner and is located at the upper part of the inner liner, or is located in the middle part of the inner liner, or is located at the lower part of the inner liner.

[0024] In a preferred embodiment, the combustion chamber is located at the upper part of the inner liner, and a water inlet and a water outlet are provided on the inner liner. The water inlet and the water outlet are spaced apart along the height direction, and the water inlet is located below the water outlet.

[0025] The technical solution of the utility model has the following significant beneficial effects:

[0026] The gas water heater provided in the embodiment of the present application adopts a heat exchange structure in which an upper heat exchange coil and a lower heat exchange coil are arranged in parallel. The high-temperature flue gas in the combustion chamber flows into the upper heat exchange coil through the first inlet, exchanges heat with the water in the upper part of the inner tank, and then flows out from the first outlet; and flows into the lower heat exchange coil through the second inlet, exchanges heat with the water in the lower part of the inner tank, and then flows out from the second outlet. By configuring the heat exchange structure to include an upper heat exchange coil and a lower heat exchange coil arranged vertically in the height direction, and the upper heat exchange coil and the lower heat exchange coil are arranged in parallel, the coil structure can ensure that the high-temperature flue gas and the water in the inner tank are fully heat exchanged, and the heat in the high-temperature flue gas is efficiently utilized, so that the heat exchange structure has a better heat exchange effect; wherein, the high-temperature flue gas in the upper heat exchange coils arranged in parallel is used to exchange heat with the water in the middle and upper part of the inner tank, and the high-temperature flue gas in the lower heat exchange coils arranged in parallel is used to exchange heat with the water in the middle and lower part of the inner tank, so that basically the same flue gas temperature can be synchronously exchanged with the water in the upper and lower parts of the inner tank, and compared with the single coil structure (the flue gas temperature of the single coil structure for heat exchange with the lower water is lower than that for heat exchange with the upper water), the uniformity of the water temperature in the upper and lower parts of the inner tank is better. Compared with a single coil structure, since the original single coil is split into two parallel upper and lower heat exchange coils, the size of the heat exchange structure can be reduced while ensuring the same heat exchange capacity, thereby reducing costs. In addition, the equipment requirements for manufacturing the coils are also low, which is conducive to large-scale, low-cost batch production.

[0027] With reference to the following description and drawings, specific embodiments of the present invention are disclosed in detail, indicating how the principles of the present invention can be employed. It should be understood that the embodiments of the present invention are not limited in scope. Within the spirit and scope of the appended claims, the embodiments of the present invention include many variations, modifications, and equivalents. Features described and / or illustrated for one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the present invention in any way. Furthermore, the shapes and proportional dimensions of the components in the drawings are for illustrative purposes only and are intended to facilitate understanding of the present invention. They are not intended to limit the shapes and proportional dimensions of the components of the present invention. Those skilled in the art, guided by the present invention, may select various possible shapes and proportional dimensions to implement the present invention, depending on the specific circumstances.

[0029] Figure 1 This is a schematic structural diagram of a gas water heater provided in an embodiment of the present application;

[0030] Figure 2 for Figure 1 AA cross-sectional view of a gas water heater provided in;

[0031] Figure 3 This is a schematic structural diagram of a heat exchange structure of a gas water heater provided in an embodiment of the present application;

[0032] Figure 4 This is a schematic diagram of a heat exchange structure of a gas water heater provided in an embodiment of the present application in a use position.

[0033] Reference numerals of this application:

[0034] 1. Combustion device;

[0035] 2. Inner liner;

[0036] 3. Heat exchange structure;

[0037] 31. Upper heat exchange coil;

[0038] 311, first import;

[0039] 312, first exit;

[0040] 310, exit section;

[0041] 32. Lower heat exchange coil;

[0042] 321, second import;

[0043] 322, Second Exit;

[0044] 320, import section;

[0045] 323, terminal coil;

[0046] 33. Tee connector. DETAILED DESCRIPTION

[0047] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, modifications of various equivalent forms of the present invention by those skilled in the art all fall within the scope defined by the claims attached to this application.

[0048] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be an element centered thereon. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an element centered thereon. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementations.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are intended only to describe specific embodiments and are not intended to limit this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0050] The utility model provides a gas water heater, which can not only ensure that the gas water heater has sufficient heat exchange capacity and improve the uniformity of water temperature above and below the inner tank, but also reduce the size and reduce the cost. In addition, the equipment requirements for manufacturing the coil are also relatively low, which is conducive to large-scale and low-cost batch production.

[0051] Please refer to the comprehensive Figures 1 to 4 , a gas water heater is provided in an embodiment of the present application specification, which may include: a combustion device 1, an inner tank 2 and a heat exchange structure 3 arranged in the inner tank 2, the flue gas outlet of the combustion device 1 is connected to the inlet of the heat exchange structure 3, and the flue gas generated by the combustion of the combustion device 1 can flow into the heat exchange structure 3 to exchange heat with the water in the inner tank 2 through the heat exchange structure 3; the heat exchange structure 3 includes an upper heat exchange coil 31 and a lower heat exchange coil 32 arranged up and down along the height direction, the upper heat exchange coil 31 and the lower heat exchange coil 32 are arranged in parallel, the flue gas in the upper heat exchange coil 31 is used to exchange heat with the water in the upper part of the inner tank 2, and the flue gas in the lower heat exchange coil 32 is used to exchange heat with the water in the lower part of the inner tank 2.

[0052] Please refer to Figure 1 and Figure 2 In the embodiment of the present application, the gas water heater mainly includes a combustion device 1, an inner tank 2 and a heat exchange structure 3, etc.

[0053] The combustion device 1 primarily comprises a burner and a combustion chamber for collecting the high-temperature flue gas generated by the burner. The combustion chamber, which is a hollow cavity joint, has a flue gas outlet for discharging the high-temperature flue gas generated by the burner. The flue gas outlet of the combustion chamber is connected to the inlet of the heat exchange structure 3. When the burner is burning, a large amount of high-temperature flue gas is generated within the combustion chamber. This high-temperature flue gas flows through the flue gas outlet into the heat exchange structure 3, where it undergoes heat exchange with the water in the inner tank 2.

[0054] Specifically, the combustion chamber can be located within the inner liner 2, or it can be located outside the inner liner 2. Alternatively, the combustion chamber can be located partially within the inner liner 2 and partially outside the inner liner 2. When the combustion chamber is located within the inner liner 2, the heat from the burner can be fully utilized to exchange heat with the water in the inner liner 2. At the height of the combustion chamber, a heat exchange structure can be omitted, and the temperature of the combustion chamber can be directly used to exchange heat with the water in the inner liner 2, thereby saving the volume, material, and cost of the heat exchange structure to a certain extent.

[0055] In the embodiments of the present application, the embodiment in which the combustion chamber is located in the inner liner 2 is mainly used as an example for illustration. Other situations in which the combustion chamber is located outside the inner liner 2 or partially outside the inner liner 2 can refer to the present application, and the present application will not be described one by one here.

[0056] Regarding the case where the combustion chamber is located in the inner liner 2, the combustion chamber can be located at the upper portion of the inner liner 2, or at the middle portion of the inner liner 2, or at the lower portion of the inner liner 2. Specifically, this application does not make specific limitations here. In the embodiments and drawings of this application, the case where the combustion chamber is located at the upper portion of the inner liner 2 is mainly used as an example for description.

[0057] In one embodiment, the combustion chamber is located at the upper part of the inner liner 2, and a water inlet and a water outlet are provided on the inner liner 2. The water inlet and the water outlet are spaced apart along the height direction, and the water inlet is located below the water outlet.

[0058] In this embodiment, when the combustion chamber is located at the upper part of the inner tank 2, the heat exchange structure 3 is located at the lower part of the combustion chamber, and the high-temperature flue gas in the combustion chamber flows from top to bottom as a whole along the height direction, thereby exchanging heat with the water in the inner tank 2.

[0059] As for the inner liner 2, when it is installed in place and in use, it can be a vertical inner liner with its axis extending along the height direction. The cross-section of the vertical inner liner can be circular or quasi-circular as a whole. In the embodiments of this application, the inner liner 2 is mainly illustrated as a vertical inner liner. Of course, this application does not exclude that the inner liner 2 can be in the form of other installation methods or shapes. Inspired by the technical essence of this application, technicians in the relevant field may also make other changes. However, as long as the functions and effects achieved are the same or similar to those of this application, they should be included in the scope of protection of this application.

[0060] The inner tank 2 is provided with a water inlet and a water outlet, and the water inlet and the water outlet are spaced apart along the height direction. The water inlet is located below the water outlet. When the water inlet is located below the water outlet, when water with a lower temperature is added to the inner tank 2 through the water inlet, it can cause minimal disturbance to the water in the inner tank 2, which is conducive to fully outputting the hot water in the inner tank 2, that is, increasing the amount of hot water in the inner tank 2; in addition, since the flow direction of the water flowing into the water inlet is from bottom to top, and the flow direction of the high-temperature flue gas is generally from top to bottom, the two are conducive to improving the heat exchange effect through convection.

[0061] In the embodiment of the present application, the heat exchange structure 3 may include an upper heat exchange coil 31 and a lower heat exchange coil 32 arranged vertically, and the upper heat exchange coil 31 and the lower heat exchange coil 32 are arranged in parallel.

[0062] The upper heat exchange coil 31 includes a coil body, which can be formed by bending a tube with good heat transfer performance (such as a metal tube). The formed coil body can be spiral or in other shapes, thereby increasing the heat transfer area and heat transfer coefficient, thereby improving heat transfer efficiency. In the embodiments of this application, the upper heat exchange coil 31 is mainly described as a spiral.

[0063] Of course, the specific form of the upper heat exchange coil 31 is not limited to the above description. Technical personnel in the relevant field may make other changes based on the technical essence of this application. However, as long as the functions and effects achieved are the same or similar to those of this application, they should be covered within the scope of protection of this application.

[0064] The structure of the lower heat exchange coil 32 can be similar to that of the upper heat exchange coil 31. The lower heat exchange coil 32 includes a coil body, which can be bent from a tube with excellent heat transfer performance (e.g., a metal tube). The formed coil body can be spiral or in other shapes, thereby increasing the heat transfer area and heat transfer coefficient, thereby improving heat transfer efficiency. In the embodiments of this application, the spiral shape of the lower heat exchange coil 32 is primarily used as an example for illustration.

[0065] Of course, the specific form of the lower heat exchange coil 32 is not limited to the above description. Technical personnel in the relevant field may make other changes based on the technical essence of this application. However, as long as the functions and effects achieved are the same or similar to those of this application, they should be covered within the scope of protection of this application.

[0066] The upper heat exchange coil 31 has a first inlet 311 and a first outlet 312, and the lower heat exchange coil 32 has a second inlet 321 and a second outlet 322. Because the upper and lower heat exchange coils 31 and 32 are arranged in parallel, the high-temperature flue gas in the combustion chamber flows into the upper heat exchange coil 31 through the first inlet 311, exchanges heat with the water in the upper portion of the inner liner 2, and then flows out through the first outlet 312; and flows into the lower heat exchange coil 32 through the second inlet 321, exchanges heat with the water in the lower portion of the inner liner 2, and then flows out through the second outlet 322. By configuring the heat exchange structure 3 to include an upper heat exchange coil 31 and a lower heat exchange coil 32 arranged vertically in the height direction, and the upper heat exchange coil 31 and the lower heat exchange coil 32 being arranged in parallel, the coil structure can ensure that the high-temperature flue gas and the water in the inner tank 2 are fully heat exchanged, and the heat in the high-temperature flue gas is efficiently utilized, so that the heat exchange structure 3 has a better heat exchange effect; wherein, the high-temperature flue gas in the upper heat exchange coil 31 arranged in parallel is used to exchange heat with the water in the middle and upper part of the inner tank 2, and the high-temperature flue gas in the lower heat exchange coil 32 arranged in parallel is used to exchange heat with the water in the middle and lower part of the inner tank 2. In this way, the flue gas of basically the same temperature can be synchronously exchanged with the water in the upper and lower parts of the inner tank 2. Compared with the single coil structure (the flue gas temperature of the single coil structure for heat exchange with the lower water is lower than that for heat exchange with the upper water), the uniformity of the water temperature in the upper and lower parts of the inner tank 2 is better.

[0067] And compared with the single coil structure, since the original single coil is split into two parallel upper heat exchange coils 31 and lower heat exchange coils 32, the diameter of the upper heat exchange coil 31 and the lower heat exchange coil 32 can be reduced while ensuring the same heat exchange capacity. When the diameter of the coil is reduced, the overall pressure drop of the single coil can be increased, the heat transfer coefficient becomes larger, and the heat transfer area can be reduced, that is, the middle diameter of the coil can also be significantly reduced, thereby reducing the size of the heat exchange structure 3, that is, reducing the material of the heat exchange structure 3 and reducing the cost; in addition, compared with the single coil, the length of the upper heat exchange coil 31 and the lower heat exchange coil 32 can be significantly reduced, and the number of coil turns can also be significantly reduced, thereby effectively reducing the equipment requirements for manufacturing the coils, which is conducive to large-scale, low-cost batch production.

[0068] In one embodiment, the heat exchange rate between the flue gas in the lower heat exchange coil 32 and the water in the lower part of the inner tank 2 is greater than the heat exchange rate between the flue gas in the upper heat exchange coil 31 and the water in the upper part of the inner tank 2, thereby facilitating the temperature uniformity and heat exchange rate between the upper and lower parts of the inner tank 2.

[0069] For the inner liner 2, the heat exchange requirement of the upper part of the inner liner 2 is less than the heat exchange requirement of the lower part of the inner liner 2. In order to ensure that the water in the inner liner 2 can be evenly heated to the target temperature and prevent the temperature of the upper part of the inner liner 2 from being locally overheated, the heat exchange between the flue gas in the lower heat exchange coil 32 and the water in the lower part of the inner liner 2 can be set to be greater than the heat exchange between the flue gas in the upper heat exchange coil 31 and the water in the upper part of the inner liner 2.

[0070] To ensure that the heat exchange rate between the flue gas in the lower heat exchange coil 32 and the water in the lower portion of the inner liner 2 is greater than the heat exchange rate between the flue gas in the upper heat exchange coil 31 and the water in the upper portion of the inner liner 2, the heat exchange areas and heat exchange coefficients of the lower heat exchange coil 32 and the upper heat exchange coil 31 can be appropriately set. Overall, the product of the heat exchange coefficient and heat exchange area of ​​the lower heat exchange coil 32 needs to be greater than the product of the heat exchange coefficient and heat exchange area of ​​the upper heat exchange coil 31.

[0071] In this embodiment, the factors affecting the heat transfer rate of the coil include: the pitch of the coil, the mean diameter of the coil, the number of coil turns, and the coil diameter. The pitch of the coil refers to the axial distance between the centerlines of two adjacent coil turns; the mean diameter of the coil refers to the diameter of the circle formed by the center of the coil helix; the number of coil turns refers to the number of complete turns of the coil around the central axis; and the coil diameter refers to the inner diameter of the coil body itself. Of course, in addition to the above factors affecting the heat transfer rate, other factors may also be included, such as the material of the coil body. In this embodiment, the main focus is on the case where the lower heat exchange coil 32 and the upper heat exchange coil 31 are made of the same material.

[0072] The initial temperature of the high-temperature flue gas flowing out of the flue gas outlet is over 1,000 degrees Celsius, while the temperature of the water in the inner tank 2 is typically several tens of degrees Celsius. Due to the significant temperature difference between the high-temperature flue gas and the water in the inner tank 2, the upper heat exchange coil 31 and the lower heat exchange coil 32 may experience a slight temperature difference in the water in the inner tank 2 at their respective locations. However, this temperature difference is negligible compared to the overall temperature difference. Therefore, it can be assumed that the temperature difference between the high-temperature flue gas flowing through the upper heat exchange coil 31 and the lower heat exchange coil 32 is the same.

[0073] Under the condition of the same temperature difference, the heat exchange amount is proportional to the 1.5 power of the coil diameter, the 0.5 power of the coil median diameter, the 0.5 power of the number of coil turns, and the 0.5 power of the coil pitch.

[0074] In one embodiment, the ratio of the pitch of the upper heat exchange coil 31 to the pitch of the lower heat exchange coil 32 is less than the product of the ratio of the median diameter of the lower heat exchange coil 32 to the median diameter of the upper heat exchange coil 31, the ratio of the number of turns of the lower heat exchange coil 32 to the number of turns of the upper heat exchange coil 31, and the ratio of the cube of the tube diameter of the lower heat exchange coil 32 to the cube of the tube diameter of the upper heat exchange coil 31.

[0075] When the upper heat exchange coil 31 and the lower heat exchange coil 32 have different median diameters, different numbers of turns, and different tube diameters, the ratio of the pitch of the upper heat exchange coil 31 to the pitch of the lower heat exchange coil 32 is less than the product of the ratio of the median diameter of the lower heat exchange coil 32 to the median diameter of the upper heat exchange coil 31, the ratio of the number of turns of the lower heat exchange coil 32 to the number of turns of the upper heat exchange coil 31, and the ratio of the cube of the tube diameter of the lower heat exchange coil 32 to the cube of the tube diameter of the upper heat exchange coil 31.

[0076] In one embodiment, the diameter of the upper heat exchange coil 31 is equal to the diameter of the lower heat exchange coil 32; the median diameter of the upper heat exchange coil 31 is equal to the median diameter of the lower heat exchange coil 32; the number of turns of the upper heat exchange coil 31 is equal to the number of turns of the lower heat exchange coil 32; and the pitch of the upper heat exchange coil 31 is smaller than the pitch of the lower heat exchange coil 32.

[0077] In this embodiment, when the diameter of the upper heat exchange coil 31 is equal to the diameter of the lower heat exchange coil 32; the median diameter of the upper heat exchange coil 31 is equal to the median diameter of the lower heat exchange coil 32; and the number of turns of the upper heat exchange coil 31 is equal to the number of turns of the lower heat exchange coil 32, in order to ensure that the heat exchange rate between the flue gas in the lower heat exchange coil 32 and the water in the lower part of the inner tank 2 is greater than the heat exchange rate between the flue gas in the upper heat exchange coil 31 and the water in the upper part of the inner tank 2, that is, when the heat exchange areas of the upper heat exchange coil 31 and the lower heat exchange coil 32 are the same, the pitch of the upper heat exchange coil 31 can be made smaller than the pitch of the lower heat exchange coil 32, so that the heat transfer coefficient of the upper heat exchange coil 31 is smaller than the heat transfer coefficient of the lower heat exchange coil 32.

[0078] like Figure 3 and Figure 4 As shown, in one embodiment, the diameter of the upper heat exchange coil 31 is equal to the diameter of the lower heat exchange coil 32; the median diameter of the upper heat exchange coil 31 is larger than the median diameter of the lower heat exchange coil 32; the number of turns of the upper heat exchange coil 31 is smaller than the number of turns of the lower heat exchange coil 32; and the pitch of the upper heat exchange coil 31 is smaller than the pitch of the lower heat exchange coil 32.

[0079] In this embodiment, when the diameter of the upper heat exchange coil 31 is equal to the diameter of the lower heat exchange coil 32, that is, the upper heat exchange coil 31 and the lower heat exchange coil 32 can be made of the same coil base material. In order to ensure that the heat exchange rate between the flue gas in the lower heat exchange coil 32 and the water in the lower portion of the inner liner 2 is greater than the heat exchange rate between the flue gas in the upper heat exchange coil 31 and the water in the upper portion of the inner liner 2, the relationship between the coil's median diameter, the number of coil turns, and the coil pitch can be reasonably controlled. When the median diameter of the upper heat exchange coil 31 is greater than the median diameter of the lower heat exchange coil 32, the number of turns of the upper heat exchange coil 31 can be smaller than the number of turns of the lower heat exchange coil 32; and the pitch of the upper heat exchange coil 31 can be smaller than the pitch of the lower heat exchange coil 32. Of course, in this embodiment, the size relationship of the above-mentioned parameters is only an example. This application mainly uses the above-mentioned example in combination with the accompanying drawings to illustrate the heat exchange structure 3. Inspired by the technical essence of this application, technical personnel in the relevant field may make other changes based on the influence of the various parameters on the heat exchange amount provided in this application. However, as long as the functions and effects achieved are the same or similar to those of this application, they should be covered within the scope of protection of this application.

[0080] Among them, when the heat exchange structure 3 is an upper heat exchange coil 31 and a lower heat exchange coil 32 arranged in parallel, the situation in which the flue gas outlet of the combustion device 1 is connected to the inlet of the upper heat exchange coil 31 and the lower heat exchange coil 32 arranged in parallel can include various forms.

[0081] like Figure 1 or Figure 2 As shown, in one embodiment, the combustion device 1 includes a combustion chamber, the combustion chamber includes a first flue gas outlet and a second flue gas outlet, the upper heat exchange coil 31 has a first inlet 311 and a first outlet 312, the lower heat exchange coil 32 has a second inlet 321 and a second outlet 322, the first inlet 311 is connected to the first flue gas outlet, and the second inlet 321 is connected to the second flue gas outlet.

[0082] In this embodiment, two relatively independent first flue gas outlets and second flue gas outlets can be provided on the combustion chamber. The first flue gas outlet is used to be connected to the first inlet 311 of the upper heat exchange coil 31, thereby being used to pass high-temperature flue gas into the upper heat exchange coil 31, so that this part of the high-temperature flue gas can exchange heat with the water in the upper part of the inner tank 2, thereby increasing the water temperature in the upper part of the inner tank 2; the second flue gas outlet is used to be connected to the second inlet 321 of the lower heat exchange coil 32, thereby being used to pass high-temperature flue gas into the lower heat exchange coil 32, so that this part of the high-temperature flue gas can exchange heat with the water in the lower part of the inner tank 2, thereby increasing the water temperature in the lower part of the inner tank 2.

[0083] Alternatively, in another embodiment, the combustion device 1 includes a combustion chamber, which is provided with a flue gas outlet, the upper heat exchange coil 31 has a first inlet 311 and a first outlet 312, the lower heat exchange coil 32 has a second inlet 321 and a second outlet 322, and the first inlet 311 and the second inlet 321 are both connected to the flue gas outlet.

[0084] In this embodiment, a flue gas outlet may be provided on the combustion chamber, and the flue gas outlet may be connected to the upper heat exchange coil 31 and the lower heat exchange coil 32 respectively through adapters. For example, a three-way joint 33 may be provided at the flue gas outlet, and the three-way joint 33 has a first interface, a second interface, and a third interface. The first interface may be connected to the flue gas outlet, and the second interface may be connected to the first inlet 311 of the upper heat exchange coil 31, so as to be used to pass high-temperature flue gas into the upper heat exchange coil 31, so that this part of the high-temperature flue gas can exchange heat with the water in the upper part of the inner liner 2, thereby increasing the water temperature in the upper part of the inner liner 2; the third interface may be connected to the second inlet 321 of the lower heat exchange coil 32, so as to be used to pass high-temperature flue gas into the lower heat exchange coil 32, so that this part of the high-temperature flue gas can exchange heat with the water in the lower part of the inner liner 2, thereby increasing the water temperature in the lower part of the inner liner 2.

[0085] In addition, the outlets of the upper heat exchange coil 31 and the lower heat exchange coil 32 arranged in parallel may have the following arrangement.

[0086] In one embodiment, the upper heat exchange coil 31 has a first inlet 311 and a first outlet 312 , and the lower heat exchange coil 32 has a second inlet 321 and a second outlet 322 . The first outlet 312 and the second outlet 322 are connected via a confluence portion.

[0087] In this embodiment, the first outlet 312 of the upper heat exchange coil 31 and the second outlet 322 of the lower heat exchange coil 32 can be connected within the inner liner 2 via a confluence, and then led out of the inner liner 2. When the first outlet 312 of the upper heat exchange coil 31 and the second outlet 322 of the lower heat exchange coil 32 can be connected within the inner liner 2 via a confluence, and then led out of the inner liner 2, the number of openings on the wall of the inner liner 2 can be reduced, thereby facilitating the reliability of the inner liner 2 during use. Of course, the embodiments of this application do not rule out the possibility that the first outlet 312 of the upper heat exchange coil 31 and the second outlet 322 of the lower heat exchange coil 32 can be led out of the inner liner 2 separately.

[0088] In the case where the first outlet 312 and the second outlet 322 are connected in the inner tank 2 by a confluence portion, the confluence portion can specifically be a tee joint 33. Of course, in the embodiment of the present application, it is not excluded that the first outlet 312 and the second outlet 322 are confluent by other means or structures. For example, the confluence portion can be an opening provided near the first outlet 312, and the opening is directly and sealedly connected to the second outlet 322 of the lower heat exchange coil 32, or the confluence portion can be an opening provided near the second outlet 322, and the opening is directly and sealedly connected to the first outlet 312 of the upper heat exchange coil 31, etc.

[0089] In this embodiment, taking the confluence portion as a tee joint 33 as an example, at least a portion of the tee joint 33 is tilted from top to bottom in the height direction. When the tee joint 33 is tilted, it is beneficial to efficiently drain the condensed water generated in the upper heat exchange coil 31 and / or the lower heat exchange coil 32 outward, preventing the condensed water from accumulating at the bottom of the upper heat exchange coil 31 and the lower heat exchange coil 32, thereby affecting the normal use of the heat exchange structure 3.

[0090] like Figure 4 As shown, further, the inclination angle of the terminal coil 323 of the lower heat exchange coil 32 at the lowest position connected to the tee joint 33 is greater than the inclination angle of the coils located above the terminal coil 323.

[0091] In this embodiment, each coil of the lower heat exchange coil 32 has a certain spiral inclination angle. Generally, the spiral inclination angle of each coil can be the same, but it is not ruled out that the spiral inclination angles of two adjacent coils may vary due to the influence of processing precision.

[0092] Among them, in order to ensure that the condensed water that may be generated in the lower heat exchange coil 32 can be efficiently discharged to the outside, the inclination angle of the terminal coil 323 at the lowest position where the lower heat exchange coil 32 is connected to the said three-way joint 33 can be set to be larger, greater than the inclination angle of the coil located above the terminal coil 323, that is, the terminal coil 323 at the lowest position where the lower heat exchange coil 32 is connected to the said three-way joint 33 can be set to have a larger downward slope.

[0093] In one embodiment, the upper heat exchange coil 31 has a first inlet 311 and a first outlet 312. An outlet section 310 extending as a whole in the height direction is provided downstream of the first outlet 312 of the upper heat exchange coil 31. The outlet section 310 is located on the inner side or the outer side of the lower heat exchange coil 32.

[0094] In this embodiment, an outlet section 310 may be provided downstream of the first outlet 312 of the upper heat exchange coil 31. This outlet section 310 is used to merge the first outlet 312 with the second outlet 322 of the lower heat exchange coil 32. The outlet section 310 may extend entirely along the height direction, thereby facilitating efficient channeling of flue gas or cooling water at the end of the upper heat exchange coil 31 toward the merged portion. The outlet section 310 may be located either inside or outside the lower heat exchange coil 32.

[0095] Specifically, the middle diameter of the upper heat exchange coil 31 is greater than the middle diameter of the lower heat exchange coil 32 , and the outlet section 310 is located outside the lower heat exchange coil 32 .

[0096] If the median diameter of the upper heat exchange coil 31 is larger than that of the lower heat exchange coil 32, the outlet section 310 of the upper heat exchange coil 31 can be located outside the lower heat exchange coil 32. This arrangement facilitates docking of the outlet section 310 with the junction. Furthermore, since the median diameter of the upper heat exchange coil 31 is larger than that of the lower heat exchange coil 32, positioning the outlet section 310 outside the lower heat exchange coil 32 does not increase the radial dimension of the heat exchange structure 3.

[0097] In one embodiment, the lower heat exchange coil 32 has a second inlet 321 and a second outlet 322. An inlet section 320 extending as a whole in the height direction is provided upstream of the second inlet 321 of the lower heat exchange coil 32. The inlet section 320 is located on the inner side or the outer side of the upper heat exchange coil 31.

[0098] In this embodiment, an inlet section 320 may be provided upstream of the second inlet 321 of the lower heat exchange coil 32. This inlet section 320 may extend in the height direction. For example, when the inner liner 2 is a vertical inner liner 2, the extension direction of the inlet section 320 may be aligned with the axial direction of the inner liner 2. When the inlet section 320 extends in the height direction, it facilitates the fastest possible introduction of high-temperature flue gas from the combustion chamber into the lower heat exchange coil 32. The inlet section 320 is located on the inner or outer side of the upper heat exchange coil 31.

[0099] Specifically, the median diameter of the lower heat exchange coil 32 is smaller than the median diameter of the upper heat exchange coil 31 , and the inlet section 320 is located inside the upper heat exchange coil 31 .

[0100] In view of the situation where the middle diameter of the lower heat exchange coil 32 is smaller than the middle diameter of the upper heat exchange coil 31, the inlet section 320 of the lower heat exchange coil 32 can be located on the inner side of the upper heat exchange coil 31, so as to effectively utilize the space inside the upper heat exchange coil 31 without additionally increasing the radial dimension of the heat exchange structure 3.

[0101] It should be noted that when the median diameter of the lower heat exchange coil 32 is larger than the median diameter of the upper heat exchange coil 31, the relative positions of the inlet section 320 and the outlet section 310 can be adaptively adjusted. For example, the outlet section 310 can be located on the inner side of the lower heat exchange coil 32, and the inlet section 320 can be located on the outer side of the upper heat exchange coil 31.

[0102] It should be noted that, in the description of this application, the terms "first," "second," etc., are used solely for descriptive purposes and to distinguish similar objects. There is no order of precedence between the two, nor should they be understood to indicate or imply relative importance. Furthermore, in the description of this application, unless otherwise specified, "plurality" means two or more.

[0103] The above-mentioned various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referenced to each other. Each embodiment focuses on the differences from other embodiments.

[0104] The above are only a few embodiments of the present invention. Although the embodiments disclosed in the present invention are as above, the contents are only for the purpose of facilitating the understanding of the present invention and are not intended to limit the present invention. Any person skilled in the art of the present invention may make any modifications and changes in the form and details of the embodiments without departing from the spirit and scope disclosed in the present invention. However, the scope of patent protection of the present invention shall still be based on the scope defined by the appended claims.

Claims

1. A gas water heater, characterized in that: The gas water heater comprises: a combustion device, an inner tank and a heat exchange structure arranged in the inner tank. The flue gas outlet of the combustion device is connected to the inlet of the heat exchange structure, and the flue gas generated by the combustion of the combustion device can flow into the heat exchange structure to perform heat exchange with the water in the inner tank through the heat exchange structure; The heat exchange structure includes an upper heat exchange coil and a lower heat exchange coil arranged vertically. The upper heat exchange coil and the lower heat exchange coil are arranged in parallel. The flue gas in the upper heat exchange coil is used to exchange heat with the water in the upper part of the inner tank, and the flue gas in the lower heat exchange coil is used to exchange heat with the water in the lower part of the inner tank.

2. The gas water heater according to claim 1, wherein: The heat exchange rate between the flue gas in the lower heat exchange coil and the water in the lower part of the inner tank is greater than the heat exchange rate between the flue gas in the upper heat exchange coil and the water in the upper part of the inner tank.

3. The gas water heater according to claim 2, wherein: The product of the heat transfer coefficient and the heat transfer area of ​​the lower heat exchange coil is greater than the product of the heat transfer coefficient and the heat transfer area of ​​the upper heat exchange coil.

4. The gas water heater according to claim 2, wherein: The ratio of the pitch of the upper heat exchange coil to the pitch of the lower heat exchange coil is smaller than the product of the ratio of the median diameter of the lower heat exchange coil to the median diameter of the upper heat exchange coil, the ratio of the number of turns of the lower heat exchange coil to the number of turns of the upper heat exchange coil, and the ratio of the cube of the tube diameter of the lower heat exchange coil to the cube of the tube diameter of the upper heat exchange coil.

5. The gas water heater according to claim 2, characterized in that: The diameter of the upper heat exchange coil is equal to the diameter of the lower heat exchange coil; the median diameter of the upper heat exchange coil is greater than the median diameter of the lower heat exchange coil; the number of turns of the upper heat exchange coil is less than the number of turns of the lower heat exchange coil; and the pitch of the upper heat exchange coil is less than the pitch of the lower heat exchange coil.

6. The gas water heater according to claim 2, characterized in that: The diameter of the upper heat exchange coil is equal to the diameter of the lower heat exchange coil; the median diameter of the upper heat exchange coil is equal to the median diameter of the lower heat exchange coil; the number of turns of the upper heat exchange coil is equal to the number of turns of the lower heat exchange coil; and the pitch of the upper heat exchange coil is smaller than the pitch of the lower heat exchange coil.

7. The gas water heater according to claim 1, wherein: The upper heat exchange coil has a first inlet and a first outlet, the lower heat exchange coil has a second inlet and a second outlet, and the first outlet and the second outlet are connected through a confluence portion.

8. The gas water heater according to claim 7, characterized in that: The confluence portion is a three-way joint.

9. The gas water heater according to claim 8, characterized in that: At least part of the three-way joints are arranged tilted from top to bottom in the height direction.

10. The gas water heater according to claim 9, characterized in that: The inclination angle of the terminal coil of the lower heat exchange coil at the lowest position connected to the tee joint is greater than the inclination angle of the coils located above the terminal coil.

11. The gas water heater according to claim 1, wherein: The combustion device includes a combustion chamber, which includes a first flue gas outlet and a second flue gas outlet. The upper heat exchange coil has a first inlet and a first outlet, and the lower heat exchange coil has a second inlet and a second outlet. The first inlet is connected to the first flue gas outlet, and the second inlet is connected to the second flue gas outlet.

12. The gas water heater according to claim 1, wherein: The combustion device includes a combustion chamber provided with a flue gas outlet. The upper heat exchange coil has a first inlet and a first outlet. The lower heat exchange coil has a second inlet and a second outlet. The first inlet and the second inlet are both connected to the flue gas outlet.

13. The gas water heater according to claim 1, wherein: The upper heat exchange coil has a first inlet and a first outlet. An outlet section extending as a whole in the height direction is provided downstream of the first outlet of the upper heat exchange coil. The outlet section is located on the inner side or the outer side of the lower heat exchange coil.

14. The gas water heater according to claim 13, wherein: The median diameter of the upper heat exchange coil is greater than the median diameter of the lower heat exchange coil, and the outlet section is located outside the lower heat exchange coil.

15. The gas water heater according to claim 1, wherein: The lower heat exchange coil has a second inlet and a second outlet. An inlet section extending as a whole along the height direction is provided upstream of the second inlet of the lower heat exchange coil. The inlet section is located on the inner side or the outer side of the upper heat exchange coil.

16. The gas water heater according to claim 15, characterized in that: The median diameter of the lower heat exchange coil is smaller than that of the upper heat exchange coil, and the inlet section is located on the inner side of the upper heat exchange coil.

17. The gas water heater according to claim 1, wherein: The combustion device comprises a combustion chamber, and the combustion chamber is located in the inner liner or outside the inner liner.

18. The gas water heater according to claim 17, wherein: The combustion chamber is located in the inner liner and is located at the upper part of the inner liner, or is located in the middle part of the inner liner, or is located at the lower part of the inner liner.

19. The gas water heater according to claim 18, wherein: The combustion chamber is located at the upper part of the inner liner. A water inlet and a water outlet are provided on the inner liner. The water inlet and the water outlet are spaced apart along the height direction. The water inlet is located below the water outlet.

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