A combustion chamber structure for preventing vibration during load changes in a gas water heater

Abstract

The present invention discloses a combustion chamber structure for preventing vibration of a gas water heater when the load changes. A shell and tube heat exchanger is arranged in the water channel inside the water heater and is connected to the combustion chamber through a flue gas bypass. When the gas water heater is initially started, if the vibration meter detects that the gas water heater is vibrating, the flue gas bypass on one side of the combustion chamber is opened, and the high-temperature and high-pressure flue gas in the combustion chamber flows into the outside of the shell and tube heat exchanger, reducing the pressure and temperature in the combustion chamber, which can effectively slow down the thermoacoustic vibration of the gas water heater. When the gas water heater is not vibrating, the flue gas bypass remains closed and does not affect the normal operation of the gas water heater. In addition, after the flue gas flows into the shell and tube heat exchanger to heat the cold water, it enters the heat exchanger to heat the cold water for the second time, realizing the cascade utilization of the waste heat of the flue gas. The present invention can effectively solve the vibration problem caused by the initial startup of the gas water heater and excessive load increase without the need for complex water heater parameter adjustments, thereby improving the safety of the gas water heater operation and the user experience.

Description

Technical Field

[0001] The invention belongs to the field of gas water heaters, and in particular relates to a combustion chamber structure for preventing vibration when the load of the gas water heater changes. Background Art

[0002] Gas water heaters are highly favored by consumers for their compact size, fast heating, and instant operation. They play a vital role in improving living conditions and enhancing quality of life. However, with economic development and rising living standards, demands for the safety and comfort of gas water heaters are becoming increasingly stringent. However, vibration issues with gas water heaters have long plagued manufacturers and users. Even after products are developed in superior laboratory environments and pass batch testing before entering consumer homes, vibration issues can still occur due to factors such as the gas source, operating environment, and product aging.

[0003] Gas water heater vibrations typically occur during initial ignition or when the load increases. The specific process is as follows: a sudden increase in gas and air flow causes the combustion to release a large amount of heat, raising the overall temperature in the combustion chamber and increasing the oscillation frequency. Furthermore, the high-temperature, high-pressure combustion products generated by the instantaneous combustion can hinder the flow of premixed or partially premixed gas from the flame hole for combustion, potentially causing flashback and extinction in severe cases. At this point, the combustion heat release decreases, the combustion temperature also drops, and the high-temperature, high-pressure flue gas also decreases accordingly, causing the gas flow from the flame hole to begin to rise again, returning the combustion chamber to a state of rising temperature and increasing high-temperature, high-pressure flue gas. This cyclical change results in unstable fluctuations in combustion heat release and acoustic pressure. If these two factors generate positive feedback reinforcement at a certain frequency during this continuous change, the thermoacoustic coupling effect promotes the continuous vibration of the gas water heater. Summary of the Invention

[0004] The purpose of the present invention is to provide a combustion chamber structure for preventing vibration when the load of a gas water heater changes. It adds a shell and tube heat exchanger in the water channel and connects it to the combustion chamber. When vibration occurs, the flue gas in the burner flows into the shell and tube heat exchanger, thereby changing the pressure fluctuation frequency in the combustion chamber. It can effectively control the occurrence of combustion vibration of the gas water heater, improve the user experience, and enhance the safety of the operation of the gas water heater.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A combustion chamber structure for preventing vibration when a gas water heater has a load change, comprising a combustion chamber, a one-way valve A, a flue gas bypass, a double-tube heat exchanger, a one-way valve B, a heat exchanger, a vibration meter, and a gas water heater controller;

[0007] A flue gas bypass is provided on one side of the combustion chamber. The flue gas bypass is connected to the flue gas inlet of the double-tube heat exchanger, and the flue gas outlet of the double-tube heat exchanger is connected to the flue gas inlet of the heat exchanger bypass. A one-way valve A is provided in the flue gas bypass, and a one-way valve B is provided between the double-tube heat exchanger and the flue gas inlet of the heat exchanger bypass.

[0008] The flue gas inlet of one-way valve A is close to the combustion chamber, and the flue gas inlet of one-way valve B is close to the shell and tube heat exchanger;

[0009] The cold water entering the house is connected to the water inlet of the shell and tube heat exchanger, and the water outlet of the shell and tube heat exchanger is connected to the water inlet of the heat exchanger;

[0010] The gas water heater controller controls the opening and closing of one-way valve A and one-way valve B through the signal transmission line. The vibration meter monitors the vibration of the combustion chamber and transmits the vibration signal to the gas water heater controller in real time.

[0011] A further improvement of the present invention is that when the gas water heater is initially started or the load increases, the vibration meter detects that the water heater is vibrating, and the gas water heater controller sends a signal to control the one-way valve A and the one-way valve B to open, and the high-pressure expanded flue gas in the combustion chamber flows into the shell and tube heat exchanger, enters the heat exchanger after heat exchange with cold water, and is mixed with the flue gas that directly enters the heat exchanger from the combustion chamber to heat the cold water for secondary heating. After cascade utilization, it flows through the smoke hood and the smoke exhaust pipe in sequence and is discharged into the atmosphere.

[0012] A further improvement of the present invention is that, on the one hand, the shell and tube heat exchanger increases the volume of the combustion chamber, releases the high-temperature and high-pressure flue gas in the combustion chamber, thereby reducing the temperature and pressure of the combustion chamber, allowing the fire hole to steadily flow out the gas, and improving the problem of continuous vibration of the water heater caused by the instability of the combustion heat release fluctuations and sound pressure fluctuations; on the other hand, it exchanges heat with cold water to achieve the cascade utilization of the waste heat of the flue gas.

[0013] A further improvement of the present invention is that when the vibration meter detects vibration in the combustion chamber, cold water flows through the shell and tube heat exchanger and the heat exchanger in sequence and is heated twice by the flue gas to become hot water required by the user.

[0014] A further improvement of the present invention is that when the vibration meter does not detect vibration of the combustion chamber, the cold water flowing through the shell and tube heat exchanger is not heated but is only heated by the heat exchanger.

[0015] A further improvement of the present invention is that the gas water heater does not vibrate during initial startup or load change, and the one-way valve A and the one-way valve B remain closed; the gas water heater vibrates during initial startup or load change, and after a set time, the gas water heater burns stably, and the one-way valve A and the one-way valve B change from open to closed.

[0016] A further improvement of the present invention is that the shell and tube heat exchanger is provided with a drainage hole. When the gas water heater is shut down, the user opens the drainage hole to discharge condensed water to prevent the flue gas bypass from being blocked.

[0017] A further improvement of the present invention is that the shell and tube heat exchanger is equipped with fins to enhance the heat exchange between the flue gas and water.

[0018] A further improvement of the present invention is that the shell and tube heat exchanger is additionally provided with threads to enhance the heat exchange between the flue gas and water.

[0019] The present invention has at least the following beneficial technical effects:

[0020] The present invention provides a combustion chamber structure for preventing vibration during load changes in gas water heaters. Compared to existing gas water heaters, the water circuit includes a double-tube heat exchanger connected to the combustion chamber. When the gas water heater is initially started or the load increases, and the vibration meter detects vibration in the water heater, the gas water heater controller sends a signal to control the opening of one-way valves A and B. The high-pressure expanded flue gas in the combustion chamber flows into the double-tube heat exchanger, exchanges heat with cold water, enters the heat exchanger, and mixes with the flue gas directly entering the heat exchanger from the combustion chamber to reheat the cold water. After cascade utilization, it flows through the smoke hood and exhaust pipe in sequence before being discharged into the atmosphere. The double-tube heat exchanger increases the volume of the combustion chamber, releasing the high-temperature and high-pressure flue gas in the combustion chamber, thereby reducing the temperature and pressure of the combustion chamber, ensuring a stable flow of gas from the fire hole, and improving the problem of continuous vibration of the water heater caused by the instability of combustion heat release and sound pressure fluctuations. It also exchanges heat with cold water, realizing the cascade utilization of the flue gas waste heat. When the gas water heater is not vibrating, the one-way valves remain closed, without affecting the normal operation of the gas water heater. Compared with the existing technology, the vibration problem of the gas water heater during initial startup and load change can be effectively solved without changing complex operating parameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural principle diagram of the present invention.

[0022] Description of reference numerals:

[0023] 1 is the combustion chamber, 2 is the one-way valve A, 3 is the flue gas bypass, 4 is the shell and tube heat exchanger, 5 is the one-way valve B, 6 is the heat exchanger, 7 is the smoke hood, 8 is the smoke exhaust pipe, 9 is the drain hole, 10 is the vibration meter, 11 is the gas water heater controller, and 12 is the signal transmission line. DETAILED DESCRIPTION

[0024] The present invention will be further described in detail below with reference to the accompanying drawings.

[0025] like Figure 1As shown, the present invention provides a combustion chamber structure for preventing vibration during load changes in a gas water heater, comprising a combustion chamber 1, a one-way valve A2, a flue gas bypass 3, a double-tube heat exchanger 4, a one-way valve B5, a heat exchanger 6, a vibration meter 10, and a gas water heater controller 11. A flue gas bypass 3 is provided on one side of the combustion chamber 1. The flue gas bypass 3 is connected to the flue gas inlet of the double-tube heat exchanger 4, and the flue gas outlet of the double-tube heat exchanger is connected to the bypass flue gas inlet of the heat exchanger 6. A one-way valve A2 is provided in the flue gas bypass 3, and a one-way valve B5 is provided between the bypass flue gas inlets of the double-tube heat exchanger 4 and the heat exchanger 6. Furthermore, the flue gas inlet of the one-way valve A2 is located near the combustion chamber 1, and the flue gas inlet of the one-way valve B5 is located near the double-tube heat exchanger 4.

[0026] The cold water entering the house is connected to the water inlet of the shell and tube heat exchanger 4, and the water outlet of the shell and tube heat exchanger 4 is connected to the water inlet of the heat exchanger 6.

[0027] The gas water heater controller 11 controls the opening and closing of the one-way valve A2 and the one-way valve B5 through the signal transmission line 12 . The vibration meter 10 monitors the vibration of the combustion chamber and transmits the vibration signal to the gas water heater controller 11 in real time.

[0028] If vibration meter 10 detects vibration in the gas water heater, the control system sends a signal to open one-way valves A2 and B5. The high-temperature, high-pressure flue gas in combustion chamber 1 flows into double-tube heat exchanger 4, exchanges heat with cold water, and then enters heat exchanger 6. There, it mixes with the flue gas that enters heat exchanger 6 directly from combustion chamber 1 to reheat the cold water. After cascade utilization, it flows through smoke hood 7 and exhaust pipe 8 before being discharged into the atmosphere. Double-tube heat exchanger 4 increases the volume of the combustion chamber, releasing the high-temperature, high-pressure flue gas in the combustion chamber, thereby reducing the temperature and pressure in the combustion chamber, ensuring a steady flow of gas out of the fire hole and alleviating the problem of continuous vibration of the water heater caused by the instability of combustion heat release and acoustic pressure fluctuations. It also exchanges heat with cold water, cascading the waste heat of the flue gas.

[0029] When the gas water heater vibrates, the cold water flows through the shell and tube heat exchanger 4 and the heat exchanger 6 in sequence and is heated twice by the flue gas to become the hot water required by the user; when the gas water heater does not vibrate, the cold water flows through the shell and tube heat exchanger 4 without being heated, and is only heated by the heat exchanger 6.

[0030] The vibration meter 10 detects that the gas water heater does not vibrate, and the one-way valve A2 and the one-way valve B5 remain closed, otherwise they will be opened.

[0031] The double-tube heat exchanger 4 is provided with a drain hole 9. When the gas water heater is shut down, the user can open the drain hole 9 to drain the condensed water to prevent the flue gas bypass 3 from being blocked.

[0032] In summary, the combustion chamber structure disclosed in this invention, designed to prevent vibration during load changes in gas water heaters, effectively addresses the vibration issues associated with initial startup and load changes in gas water heaters without requiring complex changes to operating parameters. Furthermore, when the gas water heater is not vibrating, the one-way valve remains closed, thus maintaining normal operation.

[0033] It should be understood that this embodiment is only used to illustrate the present invention and is not used to limit the scope of the present invention. In addition, it should also be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, yet, these equivalent forms also fall within the scope limited by the appended claims of the application.

Claims

1. A combustion chamber structure for preventing vibration when the load of a gas water heater changes, characterized in that: It includes a combustion chamber (1), a one-way valve A (2), a flue gas bypass (3), a double-tube heat exchanger (4), a one-way valve B (5), a heat exchanger (6), a vibration meter (10) and a gas water heater controller (11); A flue gas bypass (3) is provided on one side of the combustion chamber (1), the flue gas bypass (3) is connected to the flue gas inlet of the double-tube heat exchanger (4), and the flue gas outlet of the double-tube heat exchanger (4) is connected to the bypass flue gas inlet of the heat exchanger (6); A one-way valve A (2) is provided in the flue gas bypass (3), and a one-way valve B (5) is provided between the flue gas inlet of the double-tube heat exchanger (4) and the heat exchanger (6); The flue gas inlet of the one-way valve A (2) is close to the combustion chamber (1), and the flue gas inlet of the one-way valve B (5) is close to the shell and tube heat exchanger (4); The cold water entering the house is connected to the water inlet of the shell and tube heat exchanger (4), and the water outlet of the shell and tube heat exchanger (4) is connected to the water inlet of the heat exchanger (6); The vibration meter (10) monitors the vibration of the combustion chamber and transmits the vibration signal to the gas water heater controller (11) in real time. The gas water heater controller (11) controls the opening and closing of the one-way valve A (2) and the one-way valve B (5) through the signal transmission line (12).

2. The combustion chamber structure for preventing vibration of a gas water heater during load changes according to claim 1, characterized in that: When the gas water heater is initially started or the load increases, the vibration meter (10) detects that the water heater is vibrating, and the gas water heater controller (11) sends a signal to control the one-way valve A (2) and the one-way valve B (5) to open, and the high-pressure expanded flue gas in the combustion chamber (1) flows into the shell and tube heat exchanger (4), exchanges heat with cold water, enters the heat exchanger (6), and mixes with the flue gas that directly enters the heat exchanger (6) from the combustion chamber (1) to heat the cold water again. After cascade utilization, it flows through the smoke hood (7) and the smoke exhaust pipe (8) in sequence and is discharged into the atmosphere.

3. The combustion chamber structure for preventing vibration of a gas water heater during load changes according to claim 2, characterized in that: On the one hand, the shell and tube heat exchanger (4) increases the volume of the combustion chamber, releases the high-temperature and high-pressure flue gas in the combustion chamber, and then reduces the temperature and pressure of the combustion chamber, so that the fire hole can stably flow out the gas flow, thereby improving the problem of continuous vibration of the water heater caused by the instability of the combustion heat release fluctuation and the sound pressure fluctuation; on the other hand, it exchanges heat with cold water to realize the cascade utilization of the flue gas waste heat.

4. The combustion chamber structure for preventing vibration of a gas water heater during load changes according to claim 1, characterized in that: When the vibration meter (10) detects that the combustion chamber is vibrating, cold water flows through the shell and tube heat exchanger (4) and the heat exchanger (6) in sequence and is heated twice by the flue gas to become hot water required by the user.

5. The combustion chamber structure for preventing vibration of a gas water heater during load changes according to claim 4, characterized in that: When the vibration meter (10) does not detect vibration of the combustion chamber, the cold water flows through the shell and tube heat exchanger (4) without being heated, and is only heated by the heat exchanger (6).

6. The combustion chamber structure for preventing vibration of a gas water heater during load changes according to claim 1, characterized in that: The gas water heater does not vibrate during initial startup or load change, and the one-way valve A (2) and the one-way valve B (5) remain closed; the gas water heater vibrates during initial startup or load change, and after a set time, the gas water heater burns stably, and the one-way valve A (2) and the one-way valve B (5) change from open to closed.

7. The combustion chamber structure for preventing vibration of a gas water heater during load changes according to claim 1, characterized in that: The shell and tube heat exchanger (4) is provided with a drainage hole (9). When the gas water heater is shut down, the user opens the drainage hole (9) to drain condensed water to prevent the flue gas bypass (3) from being blocked.

8. The combustion chamber structure for preventing vibration of a gas water heater during load changes according to claim 1, characterized in that: The shell and tube heat exchanger (4) is equipped with fins to enhance the heat exchange between the flue gas and water.

9. The combustion chamber structure for preventing vibration of a gas water heater during load changes according to claim 1, characterized in that: The shell and tube heat exchanger (4) is additionally provided with threads to enhance the heat exchange between the flue gas and water.

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