Modularized fuel gas efficient heat exchange hot water equipment

Abstract

The utility model relates to the technical field of hot water equipment, and discloses modularized fuel gas efficient heat exchange hot water equipment which comprises a protective outer frame, a controller is embedded in the position, close to one side, of the front end of the protective outer frame, a heat exchange pipe is fixedly arranged in the protective outer frame, and the heat exchange pipe comprises a water container. A plurality of connecting strips are fixedly arranged in the water container, and fire tubes are fixedly arranged among the interiors of the connecting strips. According to the utility model, through the structural design of the fire tube and the water container, the layout of the water-in-pipe is realized, the heating area is increased, the residence time of gas in the fire tube is prolonged by the industrial grade stainless steel S-shaped welding fire tube group, the heat energy exchange efficiency is greatly improved, the modularization can be expanded in parallel, the occupied area of a single module is small, and the horizontal installation is supported; the intelligent temperature control system is suitable for various spaces, achieves accurate temperature adjustment and on-demand starting and stopping through intelligent control, is convenient to operate, safe and reliable, and is widely suitable for commercial and civil scenes.

Description

Technical Field

[0001] This utility model relates to the field of hot water equipment technology, and in particular to a modular gas-fired high-efficiency heat exchange hot water equipment. Background Technology

[0002] In today's society, the demand for commercial and residential hot water supply systems is extremely widespread, and gas-fired water heaters, as common hot water supply devices, occupy an important position in the market. However, existing gas-fired water heaters have many problems that urgently need to be solved.

[0003] Currently, most gas-fired water heaters on the market use "pipe-to-water" technology, where heat is exchanged by heating external water pipes with a flame. This technology has significant drawbacks, including high heat loss and a thermal efficiency generally below 80%. This not only wastes energy and increases operating costs but also contradicts the current trend of energy conservation and environmental protection. Furthermore, because traditional equipment has a relatively fixed design, its size is difficult to adjust flexibly according to the actual space available. When faced with space-constrained installation environments, it often cannot be adapted, greatly limiting its application range.

[0004] Furthermore, traditional gas-fired water heaters are poorly expandable. When hot water demand increases, it's difficult to expand capacity easily and effectively, often requiring users to replace them with larger units, which undoubtedly increases procurement costs and installation difficulty. At the same time, traditional equipment has relatively simple control methods, lacking intelligent regulation and control mechanisms, and cannot accurately control the water supply based on actual temperature requirements and hot water usage, resulting in poor stability and comfort of the hot water supply.

[0005] Therefore, those skilled in the art have provided modular gas-fired high-efficiency heat exchange hot water equipment to solve the problems mentioned in the background art. Utility Model Content

[0006] The purpose of this utility model is to address the shortcomings of existing technologies by proposing a modular gas-fired high-efficiency heat exchange hot water device. Through the structural design of the fire tubes and water tank, a water-encased tube layout is achieved, which increases the heating area. At the same time, the industrial-grade stainless steel S-shaped welded fire tube assembly extends the residence time of the gas in the fire tubes, greatly improving the heat exchange efficiency.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A modular gas-fired high-efficiency heat exchange hot water equipment includes a protective frame. A controller is embedded in the front end of the protective frame near one side. A heat exchange tube is fixedly installed inside the protective frame. The heat exchange tube includes a water tank. Multiple connecting strips are fixedly installed inside the water tank. Fire tubes are fixedly installed between the multiple connecting strips.

[0009] Furthermore, the water flow direction inside the water tank is opposite to the flame direction inside the fire tube, the flame flows along the fire tube axis, and cold water is injected from the bottom of the water tank and surrounds the fire tube to heat up in the opposite direction.

[0010] Furthermore, the fire tube is an industrial-grade stainless steel S-shaped welded fire tube assembly, which is formed by continuous welding of 304 stainless steel pipes to form a multi-pass S-shaped channel with a pipe wall thickness of ≥2mm, and can withstand high temperature of 800℃ and corrosion resistance.

[0011] Furthermore, the water tank is a round water tank made of 304 stainless steel.

[0012] Furthermore, a side mounting plate is fixedly installed at the lower end of the protective frame near one side, and a gas valve is fixedly installed on one side of the side mounting plate.

[0013] Furthermore, a fire vent is provided on one side of the lower end of the protective frame, a water valve is provided near the middle of the lower end of the protective frame, and a fan is provided on the side of the lower end of the protective frame away from the fire vent.

[0014] This utility model has the following beneficial effects:

[0015] 1. This utility model proposes a modular gas-fired high-efficiency heat exchange hot water device. Through an innovative fire tube and water tank structure design, this device achieves a water-encased tube layout, increasing the heating area by 40% compared to traditional equipment. Simultaneously, the industrial-grade stainless steel S-shaped welded fire tube assembly extends the gas residence time within the fire tube to 3.2 seconds (compared to only 1.5 seconds for traditional straight tubes), significantly improving heat exchange efficiency to over 90%. Taking a commercial kitchen scenario as an example, with three modules installed in series, the measured thermal efficiency reaches 92.7% (GB6932-2015 standard) at an initial water temperature of 15℃. Furthermore, the water temperature can be set via a PLC controller (adjustable from 40-80℃), reducing gas consumption by 30% compared to traditional equipment, effectively saving energy costs.

[0016] 2. The modular gas-fired high-efficiency heat exchange hot water equipment proposed in this utility model occupies only 0.12㎡ per module and supports horizontal installation, making it suitable for confined spaces with a height of ≥0.6m. This solves the problem of traditional equipment being difficult to adapt to space limitations due to its fixed size. Furthermore, the equipment adopts a modular expansion structure, with a basic unit size of Φ400×800mm (diameter×height), allowing multiple units to be connected in parallel via pipes. The intelligent control system monitors the water temperature in real time (±1℃ accuracy) and automatically starts and stops newly added modules. Users can flexibly expand the equipment capacity according to actual hot water demand to meet different scales of hot water supply needs. Attached Figure Description

[0017] Figure 1 This is an axonometric view of the present invention;

[0018] Figure 2 This is an axial view of the heat exchange tube of this utility model;

[0019] Figure 3 This is a schematic diagram of the internal structure of the heat exchange tube of this utility model.

[0020] Legend:

[0021] 1. Protective frame; 2. Controller; 3. Gas valve; 4. Side mounting plate; 5. Fire outlet; 6. Water valve; 7. Fan; 8. Heat exchange tube; 801. Water tank; 802. Fire tube; 803. Connecting strip. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Reference Figure 1 An embodiment of this utility model provides a modular gas-fired high-efficiency heat exchange hot water equipment, including a protective frame 1, a controller 2 embedded in the front end of the protective frame 1 near one side, a heat exchange tube 8 fixedly installed inside the protective frame 1, a side mounting plate 4 fixedly installed at the lower end of the protective frame 1 near one side, a gas valve 3 fixedly installed on one side of the side mounting plate 4, a fire outlet 5 installed at the lower end of the protective frame 1, a water valve 6 installed at the lower end of the protective frame 1 near the middle, and a fan 7 installed at the lower end of the protective frame 1 away from the fire outlet 5.

[0024] Specifically, the front end of the protective frame 1 has a pre-cut embedding groove that matches the shape of the controller 2. The controller 2 is fixed in the embedding groove with bolts, ensuring a stable connection and facilitating subsequent maintenance and repair. This embedding method not only makes the controller 2 and the protective frame 1 form a whole, making the appearance simpler, but also provides a certain degree of protection for the controller 2, preventing it from being hit by external collisions and dust intrusion. The protective frame 1 has multiple support brackets inside, and the heat exchange tube 8 is fixed to these support brackets by welding or bolting, ensuring that the heat exchange tube 8 is stable in position inside the protective frame 1 and will not be displaced due to vibration during equipment operation. The side mounting plate 4 is fixed to the lower end of the protective frame 1 near one side by welding or bolting. This connection method ensures a tight fit between the side mounting plate 4 and the protective frame 1, providing a stable support structure for the subsequent installation of the gas valve 3. The gas valve 3 is bolted to one side of the side mounting plate 4 and connected to the burner outlet 5 via a pipe. Sealing rings are used to seal the pipe connections to prevent gas leakage. The burner outlet 5, water valve 6, and blower 7 are all bolted to the corresponding positions at the lower end of the protective frame 1. The burner outlet 5 is connected to the gas valve 3 via a pipe, the water valve 6 is connected to the inlet of the water tank 801 via a water pipe, and the blower 7's outlet is connected to the combustion zone near the burner outlet 5 via an air duct, providing sufficient oxygen for combustion and expelling exhaust gases.

[0025] The protective frame 1 has standard modular connection interfaces on its sides and top, including gas connection interfaces, water pipe connection interfaces, and electrical connection interfaces. The gas connection interface is located at the bottom of the side of the protective frame 1, using a 1 / 4-point internal thread interface, and achieves quick connection of gas pipelines between modules through sealing rings and lock nuts; the water pipe connection interface uses a flanged seamless steel pipe connection, located in the middle of the side of the protective frame 1, and ensures smooth water flow through bolt tightening and rubber gasket sealing; the electrical connection interface uses a pluggable aviation plug, located at the top of the protective frame 1, to realize power supply and signal transmission between controllers 2;

[0026] The blower 7 adopts a variable frequency centrifugal structure and monitors the air pressure in the combustion zone in real time through a built-in air pressure sensor. When the equipment starts, the controller 2 sends a control signal to the blower 7 according to the set gas flow parameters, adjusts the speed of the blower 7, and precisely controls the amount of air fed into the exhaust port (5) to ensure that the gas and air are mixed in the optimal ratio of 1:10-1:12 to achieve complete combustion. The exhaust gas generated by combustion is discharged from the equipment through a dedicated exhaust gas channel through the negative pressure generated by the blower 7. At the same time, a temperature sensor is installed in the exhaust gas channel. When an abnormal exhaust gas temperature is detected, the controller 2 will automatically adjust the speed of the blower 7 to ensure combustion safety.

[0027] Controller 2, as the core of the entire equipment, monitors the equipment's operating status in real time through built-in programs and sensors, including parameters such as water temperature, water pressure, and gas flow. Once the user sets the desired hot water temperature via controller 2, it automatically adjusts the opening of gas valve 3 to control the gas supply. After gas valve 3 opens, gas is transported through pipelines to burner outlet 5, where it is ignited to produce a flame for heating. Water valve 6 controls the inflow of cold water, which enters heat exchange tube 8 for heating. The function of the blower 7 is to provide sufficient air for the combustion process and to discharge the exhaust gas produced by combustion, ensuring the stability and safety of the combustion process. Ultimately, the main components such as the controller 2, heat exchange tube 8, gas valve 3, fire exhaust port 5, water valve 6, and blower 7 are integrated into the protective frame 1 to form a whole device, which is convenient for installation and transportation. The controller 2 can intelligently control each component, monitor the operating status of the equipment in real time, and promptly detect and handle abnormal situations such as gas leakage, excessive water temperature, and abnormal water pressure, thereby improving the safety and reliability of the equipment. Users can easily set the hot water temperature and control the operation of the equipment through the controller 2 without having to operate each component individually, which reduces the difficulty of operation.

[0028] Reference Figure 1-3 The heat exchange tube 8 includes a water tank 801. Multiple connecting strips 803 are fixedly installed inside the water tank 801. Fire tubes 802 are fixedly installed between the multiple connecting strips 803. The water flow direction inside the water tank 801 is opposite to the flame direction inside the fire tube 802. The flame flows along the axial direction of the fire tube 802. Cold water is injected from the bottom of the water tank 801 and surrounds the fire tube 802 to raise the temperature in the opposite direction. The fire tube 802 is an industrial-grade stainless steel S-shaped welded fire tube 802 assembly. It is formed by continuous welding of 304 stainless steel pipes to form a multi-pass S-shaped channel with a pipe wall thickness ≥2mm. It can withstand high temperature of 800℃ and is corrosion resistant. The water tank 801 is a round water tank 801 made of 304 stainless steel.

[0029] During modular expansion, adjacent modules' water tanks 801 are connected via seamless steel pipes using flange connections to ensure smooth water flow between modules. The gas inlet and outlet of the fire tube 802 are also connected via standard gas pipeline interfaces, with sealing rings ensuring a tight seal. Simultaneously, the controllers 2 of each module are connected via communication lines to achieve data sharing and collaborative control, ensuring stable operation of the entire system.

[0030] Specifically, the two ends of the connecting strip 803 are fixed to the inner wall of the water tank 801 by welding. Multiple connecting strips 803 are evenly distributed inside the water tank 801 to form a stable support structure for fixing the fire tube 802. The fire tube 802 passes through the pre-drilled hole on the connecting strip 803 and is then fixedly connected to the connecting strip 803 by welding or clamping to ensure that the fire tube 802 is fixed in position inside the water tank 801 and will not shake due to water flow impact. The inlet and outlet of the water tank 801 are connected to the external water pipe by flange connection. The flange connection is sealed with a sealing gasket to prevent water leakage.

[0031] The fire tube 802 is an industrial-grade stainless steel S-shaped welded fire tube assembly. The combustion of fuel gas within the fire tube 802 produces a high-temperature flame, which flows axially along the fire tube 802. Due to the S-shaped multi-pass design of the fire tube 802, the residence time of the fuel gas within it is extended, allowing for more complete combustion and the release of more heat. Cold water is injected from the bottom of the water tank 801 and flows counter-currently around the fire tube 802 within the water tank 801. This counter-current water-fire flow design allows the cold water to continuously absorb heat transferred from the fire tube 802 during its flow, achieving highly efficient heat exchange. Simultaneously, both the fire tube 802 and the water tank 801 possess excellent high-temperature resistance and corrosion resistance, ensuring the stability and reliability of the equipment during long-term operation. Finally, the water flow direction inside the water tank 801 is opposite to the flame direction inside the fire tube 802, and the S-shaped multi-pass design of the fire tube 802 significantly increases the heating area and fuel gas residence time, resulting in a significant improvement in heat exchange efficiency. Compared to traditional gas-fired water heaters, this equipment boasts a thermal efficiency exceeding 90%. Both the fire tube 802 and the water tank 801 are made of stainless steel with a wall thickness ≥2mm, capable of withstanding temperatures up to 800℃ and resisting corrosion. This extends the equipment's lifespan, reduces maintenance costs, and the fire tube 802 is fixed inside the water tank 801 via a connecting strip 803, forming a stable structure that effectively resists water flow impact and vibrations during operation, ensuring the equipment's normal operation.

[0032] Working Principle: The working principle of this modular gas-fired high-efficiency heat exchange hot water equipment is based on advanced heat energy exchange and intelligent control technology. When the equipment is started, the gas valve 3 opens, and the gas enters the fire tube 802 through the fire outlet 5. At the same time, the water valve 6 opens, and cold water is injected from the bottom of the water tank 801.

[0033] The fire tube 802 is an industrial-grade stainless steel S-shaped welded fire tube assembly, continuously welded from a 304 stainless steel water tank to form a multi-pass S-shaped channel. The combustion gas inside the fire tube 802 produces a flame, which flows axially along the fire tube 802. The water tank 801 is circular, and the water flow direction inside is opposite to the flame direction inside the fire tube 802. The cold water surrounds the fire tube 802, causing it to heat up in the opposite direction. This counter-current water-fire flow design achieves highly efficient heat exchange.

[0034] During the heat exchange process, the increased heating area due to the water-coated pipe structure and the extended residence time of the gas by the S-shaped fire tube 802 allow for more efficient heat transfer to the water, thereby improving thermal efficiency. The function of the fan 7 is to ensure air supply and exhaust gas discharge during combustion, maintaining a stable combustion environment.

[0035] Controller 2, as the core of the intelligent control system, monitors the water temperature in real time. When the water temperature is detected to be lower than the set value, controller 2 automatically adjusts the opening of the gas valve 3 according to the actual situation to control the gas supply, while ensuring the normal operation of the fan 7 to maintain a stable hot water supply. When hot water demand increases, the intelligent control system automatically starts the newly added modules, achieving modular expansion through the reserved internal thread interface to meet greater hot water demand; when hot water demand decreases, the system automatically stops some modules to achieve energy-saving operation. The entire process achieves precise water temperature control and efficient energy utilization through intelligent control technology.

[0036] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A modular gas-fired high-efficiency heat exchange hot water equipment, including a protective outer frame (1), characterized in that: A controller (2) is embedded in the front end of the protective frame (1) near one side. A heat exchange tube (8) is fixedly installed inside the protective frame (1). The heat exchange tube (8) includes a water tank (801). Multiple connecting strips (803) are fixedly installed inside the water tank (801). Fire tubes (802) are fixedly installed between the multiple connecting strips (803). The direction of water flow inside the water tank (801) is opposite to the direction of flame inside the fire tube (802). The flame flows axially along the fire tube (802). Cold water is injected from the bottom of the water tank (801) and surrounds the fire tube (802) to raise the temperature in the opposite direction. The fire tube (802) is an industrial-grade stainless steel S-shaped welded fire tube (802) assembly, which is formed by continuous welding of 304 stainless steel pipe to form a multi-pass S-shaped channel with a pipe wall thickness ≥2mm. It can withstand high temperature of 800℃ and is corrosion resistant.

2. The modular gas-fired high-efficiency heat exchange hot water equipment according to claim 1, characterized in that: The water tank (801) is a round water tank (801) made of 304 stainless steel.

3. The modular gas-fired high-efficiency heat exchange hot water equipment according to claim 1, characterized in that: A side mounting plate (4) is fixedly installed at the lower end of the protective frame (1) near one side, and a gas valve (3) is fixedly installed on one side of the side mounting plate (4).

4. The modular gas-fired high-efficiency heat exchange hot water equipment according to claim 1, characterized in that: A fire vent (5) is provided on one side of the lower end of the protective frame (1), a water valve (6) is provided near the middle of the lower end of the protective frame (1), and a fan (7) is provided on the side of the lower end of the protective frame (1) away from the fire vent (5).

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