Gas heating water heater capable of preventing gas supply blockage

Abstract

The utility model discloses a gas heating water heater capable of preventing air supply blockage, which comprises a box body, a wind pressure sensor and a judgment module, and the box body is divided into an air box frame and a waterway module frame; the wind pressure sensor is provided with a negative pressure tapping port and a positive pressure tapping port, and the judgment module is provided with an air supply blockage set value; and when the difference between the positive pressure air pressure value and the negative pressure air pressure value is greater than or equal to an air supply blockage set value, judging that the air supply of the chimney is blocked. According to the water heater, the air pressure sensor is arranged in the box body, when air supply blockage occurs in the furnace body, due to the fact that air supply is reduced, and the pressure of the air box frame is relative to the pressure of the water path module frame, pressure parameters collected by the air pressure sensor also rise, and when the difference value is larger than or equal to the air supply blockage set value, it is judged that chimney air supply blockage occurs; if yes, the furnace is subjected to fault processing, and corresponding shutdown is carried out, so that the risk of misjudgment of the furnace is reduced, and the safety performance of the furnace is further improved.

Description

Technical Field

[0001] This utility model relates to the technical field of gas-fired heating and hot water boilers, specifically to a gas-fired heating and hot water boiler with anti-gas supply blockage function. Background Technology

[0002] Gas-fired heating and hot water boilers use gas combustion to heat water to a certain temperature, which is then distributed through heating pipes and radiators to provide heating. Gas supply blockage in gas-fired heating and hot water boilers is a crucial safety feature. If a blockage occurs and the boiler is not shut down promptly, insufficient oxygen during combustion can lead to excessive carbon monoxide levels in the flue gas, and may even cause the boiler to catch fire, resulting in a safety accident.

[0003] Conventional gas-fired heating and hot water boilers typically determine chimney blockage by adjusting fan speed. However, since the boiler body or air box is generally designed as a relatively sealed structure, the fan speed will increase when the gas supply is blocked. Furthermore, due to individual speed differences in fan manufacturing, the low fan speed during low-fire operation, and variations in exhaust resistance due to different chimney lengths, the fan speed changes can vary greatly or be insignificant. When the fan operating speed exceeds the design value, it is often used to determine whether the gas-fired heating and hot water boiler is blocked. This can easily lead to misjudgments, causing the boiler to malfunction and even posing safety risks. Utility Model Content

[0004] In order to overcome the shortcomings of the existing technology, the purpose of this utility model is to provide a gas-fired heating and hot water boiler with anti-gas blockage function, thereby solving the above-mentioned traditional problems.

[0005] This utility model is achieved using the following technical solution:

[0006] A gas-fired heating and hot water boiler with anti-gas supply blockage function includes a housing, a wind pressure sensor installed inside the housing, and a judgment module. The housing is divided into an upper air chamber frame and a lower water circuit module frame, with a sealing partition between the air chamber frame and the water circuit module frame. The wind pressure sensor has a negative pressure tap and a positive pressure tap. The negative pressure tap is located inside the air chamber frame to collect the negative wind pressure value within the air chamber frame, and the positive pressure tap is located inside the water circuit module frame to collect the positive wind pressure value within the water circuit module frame. The judgment module is electrically connected to the wind pressure sensor and has a gas supply blockage setting value. When the difference between the positive and negative wind pressure values ​​is greater than or equal to the gas supply blockage setting value, the gas supply to the chimney is judged to be blocked.

[0007] Preferably, the wind pressure sensor is installed inside the air box frame, and the positive pressure tap is connected to the water circuit module frame through a silicone tube.

[0008] Preferably, the air box frame is equipped with a burner, a main heat exchanger, a premixer, a fan, and an expansion tank. The air pressure sensor is installed between the fan and the premixer, and the negative pressure tap is opposite to the air inlet of the fan.

[0009] Preferably, the inlet of the premixer is provided with a vertically arranged air inlet sleeve.

[0010] Preferably, the air inlet of the air inlet sleeve is oriented upwards.

[0011] Preferably, the fan is a variable frequency fan.

[0012] Preferably, the water circuit module frame is equipped with an integrated outlet valve, a plate heat exchanger, a gas proportional valve, an integrated inlet valve, and a circulating water pump. The integrated outlet valve is connected to the outlet of the main heat exchanger through a first connecting pipe, the gas proportional valve is connected to the premixer through a second connecting pipe, and the circulating water pump is connected to the inlet of the main heat exchanger through a third connecting pipe.

[0013] Preferably, the connection between the first connecting pipe and the sealing partition is filled with a first sealing gasket, the connection between the second connecting pipe and the sealing partition is filled with a second sealing gasket, and the connection between the third connecting pipe and the sealing partition is filled with a third sealing gasket.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] This utility model of a gas-fired heating and hot water boiler incorporates a wind pressure sensor within the boiler housing. When gas supply to the boiler is blocked, the reduced gas supply causes the pressure in the air chamber frame relative to the pressure in the water circuit module frame (i.e., atmospheric pressure) to gradually increase. This leads to an increase in the pressure parameters collected by the wind pressure sensor, specifically the difference between the positive and negative wind pressure values. When this difference is greater than or equal to the set value for gas supply blockage, the boiler is identified as having a blocked chimney gas supply, and it initiates fault handling and shuts down accordingly. Once the fault has been addressed and the difference is less than the set value for gas supply blockage, the boiler will recover and restart normally. This process reduces the risk of misjudgment and further improves the boiler's safety performance. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the internal structure of the gas-fired heating and hot water boiler of this utility model;

[0017] Figure 2 for Figure 1 The enlarged view of point A shown.

[0018] In the diagram: 10. Housing; 11. Air box frame; 110. Main heat exchanger; 111. Premixer; 112. Fan; 113. Expansion tank; 114. Air inlet sleeve; 12. Water circuit module frame; 120. Integrated water outlet valve; 121. Plate heat exchanger; 122. Gas proportional valve; 123. Integrated water inlet valve; 124. Circulating water pump; 13. Sealing partition; 20. Wind pressure sensor; 21. Negative pressure tap; 22. Positive pressure tap. Detailed Implementation

[0019] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0020] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0021] In the description of this utility model, it should be understood that when an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be intermediate elements present. Conversely, when an element is referred to as being "directly" connected to another element, there are no intermediate elements.

[0022] Please see Figures 1-2This is a preferred embodiment of the gas-fired heating and hot water boiler of the present invention, used to provide heating and hot water to users and has the function of preventing gas supply blockage. Specifically, the gas-fired heating and hot water boiler includes a housing 10, a wind pressure sensor 20 installed in the housing 10, and a judgment module (not shown in the figure). The housing 10 is divided into an upper air box frame 11 and a lower water circuit module frame 12. A sealing partition 13 is provided between the air box frame 11 and the water circuit module frame 12. The wind pressure sensor 20 is provided with a negative pressure tap 21 and a positive pressure tap 22. The negative pressure tap 21 is placed in the air box frame 11 to collect the negative wind pressure value in the air box frame 11. The positive pressure tap 22 is placed in the water circuit module frame 12 to collect the positive wind pressure value in the water circuit module frame 12. The judgment module is electrically connected to the wind pressure sensor 20. The judgment module is provided with a gas supply blockage setting value. When the difference between the positive pressure value and the negative pressure value is greater than or equal to the gas supply blockage setting value, the gas supply to the chimney is judged to be blocked.

[0023] Because of national standards for the airtightness of gas-fired heating and hot water boilers: "The maximum allowable leakage rate for a heating boiler with only the connection fittings for the supply and exhaust pipes is 3m³." 3 Therefore, furnaces are generally equipped with an air-tight air box frame 11 and a non-airtight water circuit module frame 12, which is connected to the atmosphere. This utility model of a gas-fired heating and hot water furnace uses a wind pressure sensor 20 installed inside the casing 10. When gas supply is blocked in the furnace, the pressure in the air box frame 11 relative to the pressure in the water circuit module frame 12 (i.e., atmospheric pressure) gradually increases due to reduced gas supply. This causes the pressure parameter collected by the wind pressure sensor 20 to also increase, i.e., the difference between the positive and negative wind pressure values. When the difference is greater than or equal to the gas supply blockage setting value, it is judged as a chimney gas supply blockage, and the furnace performs fault handling and shuts down accordingly. When the fault is handled and the difference is less than the gas supply blockage setting value, the furnace will resolve the fault and start normally. Through the above processing, the risk of furnace misjudgment is reduced, thereby further improving the furnace's safety performance.

[0024] In one embodiment, the wind pressure sensor 20 is installed inside the air box frame 11, and the positive pressure tap 22 is connected to the water circuit module frame 12 through a silicone tube.

[0025] In this embodiment, a burner (not shown), a main heat exchanger 110, a premixer 111, a fan 112, and an expansion tank 113 are installed inside the air box frame 11. The wind pressure sensor 20 is installed between the fan 112 and the premixer 111. The negative pressure tap 21 is opposite to the air inlet of the fan 112 to improve the stability of the wind pressure collected by the wind pressure sensor 20.

[0026] Optionally, the premixer 111 is provided with a vertically arranged air inlet sleeve 114 at the inlet, with the air inlet of the air inlet sleeve 114 facing upward, which further improves the stability of the wind pressure collected in the air box frame 11.

[0027] In this embodiment, the water circuit module frame 12 is equipped with an integrated outlet valve 120, a plate heat exchanger 121, a gas proportional valve 122, an integrated inlet valve 123, and a circulating water pump 124. The integrated outlet valve 120 is connected to the outlet of the main heat exchanger 110 via a first connecting pipe, the gas proportional valve 122 is connected to the premixer 111 via a second connecting pipe, and the circulating water pump 124 is connected to the inlet of the main heat exchanger 110 via a third connecting pipe. A first sealing gasket is filled at the connection between the first connecting pipe and the sealing partition 13, a second sealing gasket is filled at the connection between the second connecting pipe and the sealing partition 13, and a third sealing gasket is filled at the connection between the third connecting pipe and the sealing partition 13 to improve the sealing performance of the air box frame 11. The first, second, and third sealing gaskets can be a single gasket, a single sheet of gasket, or a sealing material, depending on the specific needs, which will not be elaborated further here.

[0028] In this embodiment, the air blockage setting value is set in the range of 20-90 Pa. Depending on the specific situation, the corresponding parameters or range values ​​are set. The air box frame 11 is also sealed in other places, which will not be described in detail here.

[0029] In other embodiments, the fan 112 is a variable frequency fan 112. At different power levels, the fan 112 rotates at different speeds, resulting in different pressure changes in the air box frame 11. Different parameters can be set for the air pressure sensor 20 based on the parameters of the variable frequency fan 112.

[0030] In the above embodiment, a wind pressure sensor 20 is installed inside the air box frame 11 within the furnace. The positive pressure tap 22 of the wind pressure sensor 20 is connected to the water circuit module frame 12, and the negative pressure tap 21 of the wind pressure sensor 20 is connected to the air box frame. When the furnace is running, if there are different power demands for heating or bathroom use, the fan 112 will operate at different speeds based on the different duty cycles provided by the main controller inside the furnace. When the furnace power demand is high, the fan 112 operates at a high speed and the power demand is low, and vice versa. When the air supply to the furnace begins to become blocked, the fan 112 inside the air box frame 11 will continue to run. Due to the reduced air supply, the pressure in the air box frame 11 relative to atmospheric pressure will gradually increase, and the pressure parameter of the wind pressure sensor 20 will also increase. When the pressure in the air box frame 11 exceeds the atmospheric pressure and the set value of the wind pressure sensor 20, the wind pressure sensor 20 will provide a signal to the furnace main control board. The main control board will then issue a judgment, and the furnace will shut down and report the corresponding fault. When the wind pressure sensor 20 receives a value lower than the set value, the furnace will clear the fault. The change between the pressure inside the air box and the atmospheric pressure determines whether there is a blockage in the gas supply to the furnace, which greatly improves the accuracy of the gas supply blockage detection.

[0031] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above 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.

[0032] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A gas-fired heating and hot water boiler with anti-gas supply blockage function, characterized in that, The device includes a housing, a wind pressure sensor installed inside the housing, and a judgment module. The housing is divided into an upper air chamber frame and a lower water circuit module frame, with a sealing partition between the air chamber frame and the water circuit module frame. The wind pressure sensor has a negative pressure tap and a positive pressure tap. The negative pressure tap is located inside the air chamber frame to collect the negative wind pressure value within the air chamber frame, and the positive pressure tap is located inside the water circuit module frame to collect the positive wind pressure value within the water circuit module frame. The judgment module is electrically connected to the wind pressure sensor and has an air supply blockage setting value. When the difference between the positive and negative wind pressure values ​​is greater than or equal to the air supply blockage setting value, the chimney air supply is judged to be blocked.

2. The gas-fired heating and hot water boiler with anti-gas blockage function according to claim 1, characterized in that, The wind pressure sensor is installed inside the air box frame, and the positive pressure tap is connected to the water circuit module frame through a silicone tube.

3. The gas-fired heating and hot water boiler with anti-gas-supply blockage function according to claim 2, characterized in that, The air box frame is equipped with a burner, main heat exchanger, premixer, fan and expansion tank. The air pressure sensor is installed between the fan and the premixer. The negative pressure tap is opposite to the air inlet of the fan.

4. The gas-fired heating and hot water boiler with anti-gas supply blockage function according to claim 3, characterized in that, The premixer is provided with a vertically arranged air inlet sleeve at its inlet.

5. The gas-fired heating and hot water boiler with anti-gas blockage function according to claim 4, characterized in that, The air inlet of the air inlet sleeve is set upwards.

6. The gas-fired heating and hot water boiler with anti-gas blockage function according to claim 3, characterized in that, The fan is a variable frequency fan.

7. The gas-fired heating and hot water boiler with anti-gas blockage function according to claim 3, characterized in that, The water circuit module frame is equipped with an integrated outlet valve, a plate heat exchanger, a gas proportional valve, an integrated inlet valve, and a circulating water pump. The integrated outlet valve is connected to the outlet of the main heat exchanger through a first connecting pipe, the gas proportional valve is connected to the premixer through a second connecting pipe, and the circulating water pump is connected to the inlet of the main heat exchanger through a third connecting pipe.

8. The gas-fired heating and hot water boiler with anti-gas blockage function according to claim 7, characterized in that, The connection between the first connecting pipe and the sealing partition is filled with a first sealing gasket, the connection between the second connecting pipe and the sealing partition is filled with a second sealing gasket, and the connection between the third connecting pipe and the sealing partition is filled with a third sealing gasket.

Images