Modular gas volumetric water heater

Abstract

The present invention discloses a modular gas-fired volumetric water heater, comprising an insulated water storage tank, a water storage cavity is provided inside, and a heat-insulating material and a protective shell are wrapped outside; a gas heating module is used to heat water, and has a circulating water inlet, a circulating water outlet, a replenishing water inlet, and a replenishing water outlet; the circulating water inlet and the circulating water outlet are respectively connected with the water storage cavity to form a circulating water heating system, the replenishing water inlet is connected with an external cold water pipe, and the replenishing water outlet is connected with the water storage cavity to form a replenishing water channel. The gas heating module in the above-mentioned modular gas-fired volumetric water heater can work stably for a long time without scaling, and the thermal efficiency can be increased to more than 106%, with significant energy-saving effect, and the response speed of hot water supply is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of gas boilers, and in particular to a modular gas volumetric water heater. Background Art

[0002] There are two heating methods for existing modular gas-fired volumetric water heaters. One is that the burner is placed at the bottom of the insulated water tank, the smoke pipe passes through the water tank, the smoke gas directly exchanges heat from bottom to top through the outer wall of the smoke pipe and the water in the water tank, and then is discharged from the top; the other is that the burner is placed at the upper part of the insulated water tank, the smoke pipe passes through the water tank, the smoke gas directly exchanges heat from top to bottom through the outer wall of the smoke pipe and the water in the water tank, and then is discharged from the bottom. The above two methods are both traditional hot water boiler heating methods, which have the following shortcomings: 1. It is easy to scale. Almost all volumetric water heaters used to supply hot water use untreated tap water. Tap water contains calcium and magnesium particles. The harder the water quality, the more calcium and magnesium particles. When tap water is heated at high temperature, the calcium and magnesium particles in the water will precipitate and adsorb on the metal surface to form scale. Relatively static water is more likely to scale. The thermal conductivity of scale is very low, only 2-5% of metal. Therefore, once the water heater is scaled, the thermal efficiency will gradually decrease. As the thickness of the scale increases, the heat exchange becomes more difficult until the boiler is damaged. The existing solutions mainly adopt enamel inner tank which is not easy to scale and regularly add magnesium rods to soften the water quality. The enamel on the metal surface has a certain heat resistance effect, which will reduce the heat exchange efficiency. Adding magnesium rods is relatively troublesome and difficult to maintain. Even if the above methods are adopted, it can only delay scaling, and cannot fundamentally solve the scaling problem; 2. Low thermal efficiency. The two existing modular gas-fired volumetric water heaters use direct contact heat exchange between the smoke pipe and the water in the water tank. The high-temperature flue gas is discharged out of the furnace without condensation and waste heat recovery. The thermal efficiency is less than 90%, and only the second-level energy efficiency can be achieved; 3. By directly heating the water storage tank, the water in the water storage tank is heated to the set temperature as a whole, and then hot water is supplied to the outside to ensure the water outlet temperature. This type of water heater has a long heating time, low efficiency, and slow response speed in supplying hot water. Summary of the invention

[0003] The present invention aims to solve the problems existing in the prior art. To this end, the present invention proposes a modular gas-fired volumetric water heater, comprising: an insulated water storage tank, which is provided with a water storage cavity inside and is covered with an insulating material and a protective shell outside; a gas heating module, which is used to heat water and has a circulating water inlet, a circulating water outlet, a replenishing water inlet, and a replenishing water outlet; the circulating water inlet and the circulating water outlet are respectively connected to the water storage cavity to form a circulating water heating system, the replenishing water inlet is connected to an external cold water pipe, and the replenishing water outlet is connected to the water storage cavity to form a replenishing water channel.

[0004] The advantages of the modular gas-fired volumetric water heater of the above embodiment are: 1. The gas heating module and the water storage tank are separated, and a circulating heating method is adopted, so that the water in the high-temperature heating state flows at a high speed. Even if the calcium and magnesium particles in the water are precipitated by heat, they cannot precipitate and scale, which ensures that the gas heating module can work stably for a long time without scaling; 2. The main heat exchange of the gas heating module adopts a full copper fin high-efficiency heat exchanger, and the heat exchange efficiency is 5 to 7 times higher than that of the steel material smoke pipe heat exchange, and the double condensation technology of circulating water condensation and feed water condensation is adopted to recover the waste heat of flue gas. The exhaust temperature can be reduced to below 40°C, and the thermal efficiency can be increased to more than 106%, with significant energy-saving effect; 3. The circulating heating process is to take water from the low-temperature area of ​​the water storage tank, and then quickly heat it through the gas heating module and send it to the high-temperature area of ​​the hot water supply outlet. There is no need to heat all the water in the water storage tank to quickly produce hot water, and the response speed of hot water supply is greatly improved.

[0005] According to some embodiments of the present invention, the gas heating module includes a burner, a main heat exchanger and a condenser assembly, the burner is used to heat the main heat exchanger, and the condenser assembly is used to absorb waste heat of flue gas.

[0006] According to some embodiments of the present invention, the condenser assembly has a shell, on which a smoke exhaust port and a smoke inlet are provided, and a first cavity and a second cavity that are connected are provided in the shell, a first condensing heat exchanger is provided in the first cavity, and a second condensing heat exchanger is provided in the second cavity; the circulating water inlet is provided on the first condensing heat exchanger, and the circulating water outlet is provided on the main heat exchanger, and the first condensing heat exchanger is connected in series with the water circuit of the main heat exchanger and together with the water storage cavity constitute a circulating water heating system; the replenishment water inlet and the replenishment water outlet are both provided on the second condensing heat exchanger, and the external replenishment water is preheated by the second condensing heat exchanger, and then injected into the water storage cavity to constitute a replenishment channel.

[0007] According to some embodiments of the present invention, the smoke inlet is arranged at the upper part of the first cavity, the smoke outlet is arranged at the upper part of the second cavity, the first cavity and the second cavity are connected at the bottom, the two ends of the first condensing heat exchanger extend diagonally to the outside at the upper and lower parts of the first cavity respectively, and the two ends of the second condensing heat exchanger extend diagonally to the outside at the upper and lower parts of the second cavity respectively.

[0008] According to some embodiments of the present invention, the insulated water storage tank is provided with a hot water supply port and a hot water return port, and continuously supplies constant temperature hot water to the outside in a circulating manner through an external water pump; the insulated water storage tank is also provided with a connecting water inlet, a connecting water outlet, a water replenishment port and a sewage outlet that constitute a circulating water heating system with the gas heating module.

[0009] According to some embodiments of the present invention, the water replenishment port is communicated with one end of the second condensing heat exchanger.

[0010] According to some embodiments of the present invention, the water replenishment port is connected to a water treatment component.

[0011] According to some embodiments of the present invention, the water replenishment port is connected to one end of the second condensing heat exchanger, and the other end of the second condensing heat exchanger is connected to a water treatment component, the water treatment component has a first output end, a second output end and an input end, the first output end is connected to the other end of the second condensing heat exchanger, and the second output end is directly connected to the water replenishment port through a bypass channel.

[0012] According to some embodiments of the present invention, the circulating water inlet is communicated with a lower portion of the water storage tank, and the circulating water outlet is communicated with an upper portion of the water storage tank.

[0013] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0015] Figure 1 is a schematic diagram of an embodiment of the present invention;

[0016] Figure 2 Schematic diagram of a water storage tank and a heating assembly according to an embodiment of the present invention Figure 1 ;

[0017] Figure 3 Schematic diagram of a water storage tank and a heating assembly according to an embodiment of the present invention Figure 2 ;

[0018] Figure 4 is a schematic diagram of a heating assembly according to an embodiment of the present invention;

[0019] Figure 5 is a schematic diagram of a condenser according to an embodiment of the present invention;

[0020] Figure 6 is a cross-sectional schematic diagram of a condenser according to an embodiment of the present invention;

[0021] Figure 7 It is a partial schematic diagram of the condenser of the present invention.

[0022] Figure numerals: insulated water tank 100; gas heating module 110; tank shell 120; circulating water inlet 130; circulating water outlet 140; burner 150; main heat exchanger 160; condenser assembly 170; shell 180; flue gas exhaust port 190; flue gas inlet 200; first condensing heat exchanger 210; second condensing heat exchanger 220; connecting water inlet 230; connecting water outlet 240; first cavity 250; second cavity 260; water replenishment port 270; protective shell 280; water treatment assembly 290; first output end 300; second output end 310; input end 320. DETAILED DESCRIPTION

[0023] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0024] like Figures 1 to 7 As shown, a modular gas-fired volumetric water heater comprises: a box shell 120 and an insulated water storage tank 100 and a gas heating module 110 located in the box shell 120, wherein the insulated water storage tank 100 is provided with a water storage cavity inside and is covered with an insulating material and a protective shell 280 outside; the gas heating module 110 is used to heat water, and has a circulating water inlet 130, a circulating water outlet 140, a replenishing water inlet, and a replenishing water outlet; the circulating water inlet 130 and the circulating water outlet 140 are respectively connected to the water storage cavity to form a circulating water heating system, the replenishing water inlet is connected to an external cold water pipe, and the replenishing water outlet is connected to the water storage cavity to form a replenishing water channel.

[0025] The advantages of the modular gas-fired volumetric water heater of the above embodiment are as follows: 1. The gas heating module 110 is separated from the water storage tank, and a circulating heating method is adopted, so that the water in the high-temperature heating state flows at a high speed. Even if the calcium and magnesium particles in the water are precipitated by heat, they cannot precipitate and scale, which ensures that the gas heating module 110 can work stably for a long time without scaling; 2. The main heat exchange of the gas heating module 110 adopts a full copper fin high-efficiency heat exchanger, and the heat exchange efficiency is 5 to 7 times higher than that of the steel material smoke pipe heat exchange, and the double condensation technology of circulating water condensation and feed water condensation is adopted to recover the waste heat of the flue gas. The exhaust temperature can be reduced to below 40°C, and the thermal efficiency can be increased to more than 106%, with significant energy-saving effect; 3. The circulating heating process is to take water from the low-temperature area of ​​the water storage tank, and then quickly heat it through the gas heating module 110 and send it to the high-temperature area of ​​the hot water supply outlet. There is no need to heat all the water in the water storage tank to quickly produce hot water, and the response speed of hot water supply is greatly improved.

[0026] like Figure 4As shown, in some embodiments of the present invention, the gas heating module 110 includes a burner 150, a main heat exchanger 160 and a condenser assembly 170. The burner 150 is used to heat the main heat exchanger 160, and the condenser assembly 170 is used to absorb the waste heat of the flue gas. The burner 150 is located below the main heat exchanger 160 and is used to heat the main heat exchanger 160. The water in the main heat exchanger 160 and the water in the heat preservation water storage tank 100 are continuously circulated, that is, the calcium and magnesium ions in the water in the main heat exchanger 160 have no opportunity to precipitate, ensuring that no scale is generated in the main heat exchanger 160; the condenser assembly 170 is located above the main heat exchanger 160 and is used to recover the waste heat in the flue gas that has been heat exchanged by the main heat exchanger 160, thereby improving the overall thermal efficiency.

[0027] like Figures 4 to 7 In some embodiments of the present invention, the condenser assembly 170 has a shell 180, on which a smoke exhaust port 190 and a smoke inlet 200 are provided, and a first cavity 250 and a second cavity 260 are provided in communication in the shell 180, a first condensing heat exchanger 210 is provided in the first cavity 250, and a second condensing heat exchanger 220 is provided in the second cavity 260; a circulating water inlet 130 is provided on the first condensing heat exchanger 210, and a circulating water outlet 140 is provided on the main heat exchanger 160, and the first condensing heat exchanger 210 and the water circuit of the main heat exchanger 160 are connected in series and together with the water storage cavity constitute a circulating water heating system; a replenishing water inlet and a replenishing water outlet are both provided on the second condensing heat exchanger 220, and external replenishing water is preheated through the second condensing heat exchanger 220, and then injected into the water storage cavity to constitute a replenishing water channel. The above-mentioned circulating water heating system first uses the first heat exchange condenser to absorb the flue gas waste heat to preheat the water, and then enters the main heat exchanger 160 to exchange heat with the high-temperature flue gas, making full use of the flue gas waste heat. The flue gas temperature after heat exchange in the first heat exchange condenser can drop to about 80 degrees.

[0028] like Figures 4 to 7 In some embodiments of the present invention, the smoke inlet 200 is arranged at the upper part of the first cavity 250, the smoke outlet 190 is arranged at the upper part of the second cavity 260, and the first cavity 250 and the second cavity 260 are connected at the bottom, thereby, the smoke can stay in the shell 180 for a longer time, so as to provide enough time for the smoke to exchange heat with the first heat exchange condenser and the second heat exchange condenser, thereby improving the overall thermal efficiency. The two ends of the first condensing heat exchanger 210 extend diagonally to the outside at the upper and lower parts of the first cavity 250, respectively, and the two ends of the second condensing heat exchanger 220 extend diagonally to the outside at the upper and lower parts of the second cavity 260, respectively; thereby, the first heat exchange condenser can exchange heat with the smoke by convection, and the second heat exchange condenser can exchange heat with the smoke by convection.

[0029] like Figures 1 to 3As shown, in some embodiments of the present invention, the heat preservation water storage tank 100 is provided with a hot water supply port and a hot water return port, and constant temperature hot water is continuously supplied to the outside in a circulating manner through an external water pump; the heat preservation water storage tank 100 is also provided with a connecting water inlet 230, a connecting water outlet 240, a water replenishment port 270 and a sewage outlet that form a circulating water heating system with the gas heating module 110, and the connecting water inlet 230 is connected to the circulating water outlet 140, and the connecting water outlet 240 is connected to the circulating water inlet 130. The relative height of the connecting water inlet 230 is higher than the connecting water outlet 240, and water is supplied from the lower part of the water tank into the circulating water heating system, which can effectively improve the thermal efficiency.

[0030] like Figures 1 to 3 As shown, in some embodiments of the present invention, the water replenishment port 270 is connected to one end of the second condensing heat exchanger 220, and the other end of the second condensing heat exchanger 220 is replenished with normal temperature water, generally tap water, which is lower than the flue gas temperature (about 80 degrees) flowing through the second condensing heat exchanger 220. Therefore, heat can be effectively absorbed from the flue gas flowing through the second condensing heat exchanger 220. The flue gas temperature after passing through the second condensing heat exchanger 220 can be reduced to about 40 degrees. Thereby, the thermal efficiency of the modular gas volumetric water heater can reach more than 106%.

[0031] In some embodiments of the present invention, in order to reduce the generation of scale in the insulated water tank 100, the water inlet 270 is connected to a water treatment component 290. The water treatment component 290 is generally used to soften tap water and is filled with silicon phosphorus crystal particles.

[0032] As shown in the figure, in some embodiments of the present invention, the water replenishment port 270 is connected to one end of the second condensing heat exchanger 220, and the other end of the second condensing heat exchanger 220 is connected to the water treatment component 290, and the water treatment component 290 has a first output end 300, a second output end 310 and an input end 320. The first output end 300 is connected to the other end of the second condensing heat exchanger 220, and the second output end 310 is directly connected to the water replenishment port 270 through a bypass channel.

[0033] In this embodiment, under normal conditions, the pipeline between the second output terminal 310 and the water replenishment port 270 is closed, and all water added to the water tank is preheated by the third heat exchanger. When the water supply speed of the insulated water tank 100 is too fast, resulting in insufficient water intake at the water replenishment port 270, the pipeline between the second output terminal 310 and the water replenishment port 270 can be opened, and softened water can be added to the water replenishment port 270 from the first output terminal 300 and the second output terminal 310 at the same time, thereby increasing the water replenishment speed.

[0034] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0035] Of course, the invention is not limited to the above-mentioned embodiments, and those skilled in the art may make equivalent modifications or substitutions without violating the spirit of the invention, and these equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A modular gas-fired volumetric water heater, characterized in that: include: The heat-insulating water storage tank has a water storage cavity inside and is wrapped with heat-insulating materials and a protective shell outside; The gas heating module is used to heat water and has a circulating water inlet, a circulating water outlet, a replenishing water inlet, and a replenishing water outlet; the circulating water inlet and the circulating water outlet are respectively connected to the water storage chamber to form a circulating water heating system, the replenishing water inlet is connected to an external cold water pipe, and the replenishing water outlet is connected to the water storage chamber to form a replenishing water channel; the gas heating module includes a burner, a main heat exchanger and a condenser assembly, the burner is used to heat the main heat exchanger, and the condenser assembly is used to absorb the waste heat of the flue gas; the condenser assembly has a shell, and the shell is provided with a flue gas discharge port and a flue gas outlet. Inlet, the shell is provided with a first cavity and a second cavity in communication, the first cavity is provided with a first condensing heat exchanger, and the second cavity is provided with a second condensing heat exchanger; the circulating water inlet is provided on the first condensing heat exchanger, and the circulating water outlet is provided on the main heat exchanger. The first condensing heat exchanger and the water circuit of the main heat exchanger are connected in series and together with the water storage cavity form a circulating water heating system; the replenishing water inlet and the replenishing water outlet are both provided on the second condensing heat exchanger, and the external replenishing water is preheated by the second condensing heat exchanger and then injected into the water storage cavity to form a replenishing water channel; The smoke inlet is arranged at the upper part of the first cavity, the smoke outlet is arranged at the upper part of the second cavity, the first cavity and the second cavity are connected at the bottom, the two ends of the first condensing heat exchanger extend diagonally to the outside at the upper part and the lower part of the first cavity respectively, and the two ends of the second condensing heat exchanger extend diagonally to the outside at the upper part and the lower part of the second cavity respectively.

2. The modular gas-fired volumetric water heater according to claim 1, characterized in that: The insulated water storage tank is provided with a hot water supply port and a hot water return port, and continuously supplies constant temperature hot water to the outside in a circulating manner through an external water pump; the insulated water storage tank is also provided with a connecting water inlet, a connecting water outlet, a water replenishment port and a sewage outlet that constitute a circulating water heating system with the gas heating module.

3. The modular gas-fired volumetric water heater according to claim 2, characterized in that: The water replenishment port is communicated with one end of the second condensing heat exchanger.

4. The modular gas-fired volumetric water heater according to claim 2, characterized in that: The water replenishment port is connected with a water treatment component.

5. The modular gas-fired volumetric water heater according to claim 2, characterized in that: The water replenishment port is connected to one end of the second condensing heat exchanger, and the other end of the second condensing heat exchanger is connected to a water treatment component, and the water treatment component has a first output end, a second output end and an input end, the first output end is connected to the other end of the second condensing heat exchanger, and the second output end is directly connected to the water replenishment port through a bypass channel.

6. The modular gas-fired volumetric water heater according to claim 1, characterized in that: The circulating water inlet is communicated with the lower part of the water storage tank, and the circulating water outlet is communicated with the upper part of the water storage tank.

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