A gas water heater and its blockage protection method

Abstract

The present invention belongs to the technical field of gas water heaters, and more specifically, relates to a gas water heater and a blockage protection method thereof. The gas water heater includes a water heater main body, a controller, an air inlet pipe, and a premixer installed on the water heater main body; one end of the air inlet pipe is connected to the air inlet of the water heater, and the other end is communicated with the premixer. Among them, a wind pressure sensor and a pressure transmission pipe are further included; the wind pressure sensor is installed on the water heater main body and is signal-connected to the controller; an air pipe pressure transmission port is provided on the air inlet pipe, one end of the pressure transmission pipe is communicated with the negative pressure transmission port on the wind pressure sensor, and the other end is communicated with the air pipe pressure transmission port. The gas water heater and the blockage protection method provided by the present invention have a simple structure, realize full-process blockage protection and extended over-standard protection, directly perform protection discrimination through the relationship between wind pressure and fan speed, and have a fast response speed.

Description

Technical Field

[0001] The present invention belongs to the technical field of gas water heaters, and more specifically, relates to a gas water heater and a blockage protection method thereof. Background Art

[0002] Gas water heaters are generally installed on balconies or outdoors, and often encounter bad weather conditions such as strong winds and heavy rains, or the situation of air duct blockage. If the gas water heater does not have a certain wind resistance, it is very easy for the flue gas to exceed the standard, then the flame goes out, and finally it cannot be used. Most of the current gas water heaters use mechanical air pressure switches or methods such as the current signal feedback by an indirect fan when the air duct is blocked to achieve blockage protection, which can meet the use under general environmental changes. However, generally, the mechanical air pressure switch can only protect one point, cannot achieve full-process blockage protection, cannot well ensure that the flue gas does not exceed the standard throughout the operation of the machine, and even if the flue gas exceeds the standard, the shutdown function cannot be realized to ensure user safety; and the method of feedback current and other signals through the fan is an indirect control method, and there will be certain limitations in the response speed. Summary of the Invention

[0003] In order to overcome the above defects in the prior art, the present invention provides a gas water heater with a simple structure, which can monitor the air pressure value of the intake air duct in real time and can effectively monitor whether the water heater is blocked.

[0004] Another object of the present invention is to provide a blockage protection method for a gas water heater, which directly discriminates protection through the relationship between air pressure and fan speed, and has a fast response speed.

[0005] To solve the above technical problems, the technical solution adopted by the present invention is: a gas water heater, including a water heater main body, a controller, an intake air duct and a premixer installed on the water heater main body; one end of the intake air duct communicates with the air inlet of the water heater, and the other end communicates with the premixer. Among them, it further includes an air pressure sensor and a pressure transmission pipe; the air pressure sensor is installed on the water heater main body and is signal-connected to the controller; an air duct pressure transmission port is provided on the intake air duct, one end of the pressure transmission pipe communicates with the pressure transmission port on the air pressure sensor, and the other end communicates with the air duct pressure transmission port.

[0006] The gas water heater provided by the present invention with blockage protection only needs to add an air pressure sensor on the basis of the existing gas water heater, monitor the air pressure state of the intake air duct through the air pressure sensor, and combine the control of the controller to achieve the blockage protection of the gas water heater, with a simple structure and low cost.

[0007] In one embodiment, a gas proportional valve is further included. The gas proportional valve is a pneumatically controlled gas proportional valve, which controls the gas volume participating in combustion according to the air intake volume of the air inlet pipe. The gas proportional valve is communicated with the premixer through a gas inlet pipe; the gas proportional valve is signal-connected to the controller. Before the gas enters the water heater, it first needs to flow through the gas proportional valve, and the gas flow rate into the water heater is controlled by controlling the gas proportional valve.

[0008] In one embodiment, a blower is further included. The air inlet end or the air outlet end of the blower is communicated with the premixer, and the blower is signal-connected to the controller.

[0009] In one embodiment, a burner, a heat exchanger and a smoke exhaust hood are further included. The other end of the blower is communicated with the burner through a pipe. The burner is connected to one end of the heat exchanger, the other end of the heat exchanger is connected to the smoke exhaust hood, and the smoke outlet of the smoke exhaust hood is connected to the smoke exhaust pipe.

[0010] In one embodiment, the air duct pressure transmission port is located on the straight pipe section of the air inlet pipe.

[0011] The present invention also provides a blockage protection method for the above-mentioned gas water heater, including the following steps:

[0012] S1. Through the wind pressure sensor, monitor the wind pressure signal of the real-time air inlet pipe, and feed back the monitored wind pressure value to the controller; at the same time, monitor the real-time rotation speed n1 of the blower, and feed back the blower rotation speed n1 to the controller;

[0013] S2. Calculate the closing threshold n2 of the blower rotation speed under the real-time wind pressure;

[0014] S3. The controller compares the relationship between the blower rotation speed closing threshold n2 and the real-time wind pressure rotation speed n1 in real time. If n2 is less than n1, go to step S1; if n2 is greater than or equal to n1, go to step S4;

[0015] S4. The controller compares the relationship between the maintenance time t2 of the real-time wind pressure value and the time threshold t1. If t2 is less than t1, go to step S1; if t2 is greater than or equal to t1, go to step S5; where the maintenance time t2 refers to the time when the real-time monitored wind pressure value maintains a certain value; the time threshold t1 is the threshold of the wind pressure maintenance time set according to the actual situation of the system;

[0016] S5. Report a fault, and the controller controls the gas proportional valve and the blower to close, and stops supplying gas to the water heater.

[0017] In one of the embodiments, the method for obtaining the closing threshold n2 includes: First, when the gas water heater is in an unblocked state, measure the normal correspondence relationship between the fan speed and the corresponding air pressure value to form a "wind pressure - fan speed curve graph in the unblocked state"; Then, adjust the gas water heater to a blocked state until the flue gas exceeds the standard, and measure the relationship between the fan speed and the corresponding air pressure value to form a "wind pressure - fan speed curve graph in the blocked state"; Finally, find the corresponding rotational speed values under the same air pressure P1 in the graph. The fan speed corresponding to the "wind pressure - fan speed curve graph in the unblocked state" is n1; The fan speed corresponding to the "wind pressure - fan speed curve graph in the blocked state" is n2.

[0018] Compared with the prior art, the beneficial effects are as follows: A gas water heater and its blockage protection method provided by the present invention have a simple structure, realize full - process blockage protection and extended over - standard protection, directly perform protection discrimination through the relationship between wind pressure and fan speed, and have a fast response speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the gas water heater of the present invention.

[0020] Figure 2 It is a schematic diagram of the control relationship of the gas water heater of the present invention.

[0021] Figure 3 It is a schematic diagram of the method flow of the present invention.

[0022] Figure 4 It is a schematic diagram of the wind pressure - fan speed curve of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The drawings are only for illustrative purposes and should not be construed as limitations on the present invention; To better illustrate this embodiment, some components in the drawings will be omitted, enlarged, or reduced, and do not represent the actual size of the product; For those skilled in the art, it is understandable that some well - known structures and their descriptions in the drawings may be omitted. The positional relationships described in the drawings are only for illustrative purposes and should not be construed as limitations on the present invention.

[0024] Embodiment 1:

[0025] As Figure 1 and Figure 2As shown, a gas water heater includes a water heater main body 1, a controller 2, an air inlet pipe 3, and a premixer 4 installed on the water heater main body 1. One end of the air inlet pipe 3 communicates with the air inlet of the water heater, and the other end is connected to the premixer 4. Further, a wind pressure sensor 5 and a pressure transmission pipe 6 are included. The wind pressure sensor 5 is installed on the water heater main body 1 and is signal-connected to the controller 2. An air pipe pressure transmission port 8 is provided on the air inlet pipe 3. One end of the pressure transmission pipe 6 communicates with the pressure transmission port 7 on the wind pressure sensor 5, and the other end communicates with the air pipe pressure transmission port 8.

[0026] Specifically, a gas proportional valve 9, a blower 11, a burner 12, a heat exchanger 13, and a smoke exhaust hood are further included. The gas proportional valve 9 is installed at one end of a gas inlet pipe 10, and the other end of the gas inlet pipe 10 is connected to the premixer 4. The gas proportional valve 9 and the blower 11 are signal-connected to the controller 2. The intake end or the outlet end of the blower 11 is connected to the premixer 4, and the other end of the blower 11 is connected to the burner 12 through a pipe. The burner 12 is connected to one end of the heat exchanger 13, the other end of the heat exchanger 13 is connected to the smoke exhaust hood, and the smoke outlet of the smoke exhaust hood is connected to a smoke exhaust pipe 14.

[0027] The gas proportional valve 9 is a pneumatically controlled gas proportional valve. The pneumatically controlled gas proportional valve controls the gas volume participating in combustion according to the air intake volume of the air inlet pipe 3. The gas output by the pneumatically controlled gas proportional valve is determined by the air intake volume generated by the blower 11 according to a set ratio, so as to achieve the purpose of complete combustion of the gas-air mixture.

[0028] In one embodiment, the air pipe pressure transmission port 8 is located on the straight pipe section of the air inlet pipe 3.

[0029] In some embodiments, a water inlet temperature sensor, a water outlet temperature sensor, and a water flow sensor are further included. The water inlet temperature sensor is provided on the water inlet pipe of the water heater, the water outlet temperature sensor is provided on the water outlet pipe of the water heater, and the water flow sensor is provided on the water inlet pipe of the water heater.

[0030] Working principle:

[0031] When the gas water heater is working, fresh air enters the premixer 4 through the air inlet pipe 3. At the same time, due to the negative pressure in the premixer 4, gas enters the premixer 4 through the gas proportional valve 9 and the gas inlet pipe 10. The air and gas are premixed in the premixer 4 and then enter the blower 11 for further premixing. After being premixed well, they enter the burner 12 for combustion. The flue gas is heat-exchanged by the heat exchanger 13 and then discharged through the exhaust pipe 14. The heat load of the gas water heater can be achieved only by adjusting the rotation speed of the blower 11. After the gas water heater is normally started, it enters the blockage protection mode. When there is a blockage in the air or flue gas circulation channel, the wind pressure of the air inlet pipe 3 will change. The change in wind pressure will be transmitted to the wind pressure sensor 5 through the wind pressure transmission port 8, the pressure transmission pipe 6, and the negative pressure transmission port 7 of the air inlet pipe 3. The wind pressure sensor 5 transmits the wind pressure to the controller 2 in real time. At this time, the pressure difference becomes smaller, and the heat load will also become smaller. At the same time, due to the constant temperature function of the water heater, the water heater will increase the rotation speed of the blower 11 to ensure the output load of the water heater to ensure the constant temperature target of the hot water. During the process, the controller 2 monitors the wind pressure value of the wind pressure sensor 5 and the rotation speed of the blower 11. When the condition for determining blockage is reached, it reports a fault, stops the gas supply, and purges the remaining gas in the combustion chamber.

[0032] As Figure 2 shown, it is a schematic diagram of the blockage protection electronic control logic principle of the present invention. The controller 2 is respectively connected to the water inlet temperature sensor, the water outlet temperature sensor, the water flow sensor, the wind pressure sensor 5, the blower 11, and the gas proportional valve 9 by signals. Among them, the blower 11 is a DC speed control blower; the water inlet temperature sensor transmits the temperature signal to the controller 2 through the water inlet temperature feedback circuit; the water outlet temperature sensor transmits the temperature signal to the controller 2 through the water outlet temperature feedback circuit; the wind pressure sensor 5 transmits the wind pressure signal to the controller 2 through the wind pressure signal feedback circuit; the controller 2 controls the blower 11 through the blower 11 control circuit to achieve different rotation speeds. At the same time, the blower 11 feeds back the real-time rotation speed of the blower 11 to the controller 2 through the rotation speed feedback circuit; the gas proportional valve 9 controls the on-off of the gas proportional valve 9 through the proportional valve control circuit. After the water heater starts to work, the water heater enters the blockage protection mode, and the controller 2 will collect the above data in real time and determine the blockage state of the air intake and exhaust channels of the water heater in real time.

[0033] Embodiment 2

[0034] As Figure 3 shown, this embodiment provides a blockage protection method for the gas water heater described in Embodiment 1, including the following steps:

[0035] S1. Through the wind pressure sensor 5, monitor the wind pressure signal of the real-time air inlet pipe 3, and feedback the monitored wind pressure value to the controller 2; at the same time, monitor the real-time rotation speed n1 of the blower 11, and feedback the rotation speed n1 of the blower 11 to the controller 2;

[0036] S2. Calculate the shutdown threshold n2 of the rotational speed of the blower 11 under the real-time wind pressure;

[0037] S3. The controller 2 compares the relationship between the shutdown threshold n2 of the rotational speed of the blower 11 and the rotational speed n1 of the real-time wind pressure. If n2 is less than n1, then proceed to step S1; if n2 is greater than or equal to n1, then proceed to step S4;

[0038] S4. The controller 2 compares the relationship between the maintenance time t2 of the real-time wind pressure value and the time threshold t1. If t2 is less than t1, then proceed to step S1; if t2 is greater than or equal to t1, then proceed to step S5; where the maintenance time t2 refers to the time when the real-time monitored wind pressure value maintains a certain value; the time threshold t1 is the threshold of the wind pressure maintenance time set according to the actual situation of the system;

[0039] S5. Report a fault, the controller 2 controls the gas proportional valve 9 and the blower 11 to close, and stops supplying gas to the water heater; at the same time, purge the remaining gas in the combustion chamber to ensure user safety.

[0040] In one of the embodiments, as Figure 4 shown, the method for obtaining the shutdown threshold n2 includes: First, measure the normal correspondence relationship between the rotational speed of the blower 11 and the corresponding wind pressure value when the gas water heater is in an unblocked state, and form a "wind pressure - blower rotational speed curve graph in the unblocked state"; then, adjust the gas water heater to a blocked state until the flue gas exceeds the standard, and measure the relationship between the rotational speed of the blower 11 and the corresponding wind pressure value to form a "wind pressure - blower rotational speed curve graph in the blocked state"; finally, find the corresponding rotational speed value at the same wind pressure P1 in the graph. The rotational speed of the blower 11 corresponding to the "wind pressure - blower rotational speed curve graph in the unblocked state" is n1; the rotational speed of the blower 11 corresponding to the "wind pressure - blower rotational speed curve graph in the blocked state" is n2.

[0041] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0042] In addition, the terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0043] In the present invention, unless otherwise clearly specified and defined, terms such as "mounted", "connected", "coupled", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0045] In the description of this specification, descriptions with reference to terms such as "an embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0046] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

[0047] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation manners here. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

1. A clogging protection method for a gas water heater, characterized in that The gas water heater includes a water heater main body, a controller, an air inlet pipe, and a premixer installed on the water heater main body; one end of the air inlet pipe communicates with the air inlet of the water heater, and the other end communicates with the premixer. The air pressure sensor is installed on the water heater main body and is signal-connected to the controller; there is an air pipe pressure transfer port on the air inlet pipe, one end of the pressure transfer pipe communicates with the pressure transfer port on the air pressure sensor, and the other end communicates with the air pipe pressure transfer port; it also includes a gas proportional valve. The gas proportional valve is a pneumatically controlled gas proportional valve, and the pneumatically controlled gas proportional valve controls the gas volume participating in combustion according to the air intake volume of the air inlet pipe. The gas proportional valve communicates with the premixer through a gas inlet pipe; the gas proportional valve is signal-connected to the controller; the intake end or the exhaust end of the blower communicates with the premixer, and the blower is signal-connected to the controller; The blockage protection method includes the following steps: S1. Through the air pressure sensor, monitor the real-time air pressure signal of the air inlet pipe, and feedback the monitored air pressure value to the controller; at the same time, monitor the rotational speed n1 of the real-time blower and feedback the blower rotational speed n1 to the controller; S2. Calculate the shutdown threshold n2 of the blower rotational speed under the real-time air pressure; S3. The controller compares the relationship between the blower rotational speed shutdown threshold n2 and the real-time air pressure rotational speed n1 in real time. If n2 is less than n1, enter step S1; if n2 is greater than or equal to n1, enter step S4; S4. The controller compares the relationship between the maintenance time t2 of the real-time air pressure value and the time threshold t1. If t2 is less than t1, enter step S1; if t2 is greater than or equal to t1, enter step S5; where the maintenance time t2 refers to the time when the real-time monitored air pressure value maintains a certain value; the time threshold t1 is the threshold of the air pressure maintenance time set according to the actual situation of the system; S5. Report a fault, and the controller controls the gas proportional valve and the blower to close, and stops supplying gas to the water heater; Among them, the method for obtaining the shutdown threshold n2 includes: First, measure the normal correspondence relationship between the blower rotational speed and the corresponding air pressure value when the gas water heater is in an unblocked state to form a "blower rotational speed - air pressure curve graph in the unblocked state"; then, adjust the gas water heater to a blocked state until the flue gas exceeds the standard, and measure the relationship between the blower rotational speed and the corresponding air pressure value to form a "blower rotational speed - air pressure curve graph in the blocked state"; finally, find the rotational speed value corresponding to the same air pressure P1 in the graph. The blower rotational speed corresponding to the "blower rotational speed - air pressure curve graph in the unblocked state" is n1; the blower rotational speed corresponding to the "blower rotational speed - air pressure curve graph in the blocked state" is n2.

2. The clogging protection method of the gas water heater according to claim 1, characterized in that, It also includes a burner, a heat exchanger, and a smoke exhaust hood. The other end of the blower is connected to the burner through a pipe. The burner is connected to one end of the heat exchanger, the other end of the heat exchanger is connected to the smoke exhaust hood, and the smoke exhaust port of the smoke exhaust hood is connected to the smoke exhaust pipe.

3. The clogging protection method of the gas water heater according to claim 1, characterized in that, The air pipe pressure transfer port is located on the straight pipe section of the air inlet pipe.

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