Wind pressure switch assembly, gas wall-mounted boiler including the same, and control method thereof

Abstract

The present invention discloses a wind pressure switch assembly, a gas wall-mounted boiler including the wind pressure switch assembly, and a control method for the gas wall-mounted boiler. The wind pressure switch assembly is used for a gas wall-mounted boiler including a blower with multiple operating speeds, and it includes multiple wind pressure switches, a pressure-taking device, and a connecting pipe. The first detection port of each of the multiple wind pressure switches is communicated with the first pressure-taking port of the pressure-taking device via a first connecting pipe, and the second detection port of each of the multiple wind pressure switches is communicated with the second pressure-taking port of the pressure-taking device via a second connecting pipe. Among them, each of the multiple wind pressure switches corresponds to each of the multiple operating speeds of the blower respectively, and the start-up pressure difference / shutdown pressure difference of each of the multiple wind pressure switches is set according to the corresponding one of the multiple operating speeds of the blower respectively. This wind pressure switch assembly can ensure the use safety of the gas wall-mounted boiler at multiple operating speeds of the blower.

Description

Technical Field

[0001] The present invention relates to a gas wall-mounted boiler, and in particular to a wind pressure switch assembly for a gas wall-mounted boiler, a gas wall-mounted boiler including the wind pressure switch assembly, and a control method thereof. Background Art

[0002] A gas wall-mounted boiler generally includes a blower and a wind pressure switch assembly used in combination with the blower. When the blower stops rotating accidentally, its rotation speed decreases, or the intake and exhaust passages are blocked, resulting in insufficient exhaust gas volume or inability to exhaust gas, the wind pressure switch will automatically disconnect. Therefore, the control unit stops the operation of the gas wall-mounted boiler to ensure the safety of using the gas wall-mounted boiler.

[0003] The wind pressure switch assembly in a traditional gas wall-mounted boiler generally includes only one wind pressure switch (i.e., a wind pressure sensor), which has a set of start-up pressure differences and shut-down pressure differences (i.e., ON / OFF points), and the start-up pressure difference is greater than the shut-down pressure difference. This set of start-up pressure differences / shut-down pressure differences corresponds to a rotation speed V of the blower. In the start-up stage of the gas wall-mounted boiler, when the blower speed gradually rises to the rotation speed V, the pressure difference in the wind pressure switch reaches its start-up pressure difference, so the wind pressure switch closes, causing the control unit to start the operation of the gas wall-mounted boiler; in the continuous operation stage of the gas wall-mounted boiler, when the blower stops operating accidentally, its rotation speed decreases, or the intake and exhaust passages are blocked, resulting in insufficient exhaust gas volume or inability to exhaust gas, the pressure difference in the wind pressure switch gradually decreases to its shut-down pressure difference, so the wind pressure switch disconnects, causing the control unit to stop the operation of the gas wall-mounted boiler to avoid the increase of indoor carbon monoxide concentration due to unsmooth exhaust, which poses a threat to the personal safety of users.

[0004] However, the above-mentioned wind pressure switch assembly is only applicable to the case where the blower of the gas wall-mounted boiler has one rotation speed. With the development of related technologies of gas wall-mounted boilers, in order to improve their operation efficiency or perform segmented combustion control, it may be necessary for the blower to rotate at different speeds under different conditions. At this time, since the pressure differences formed in the wind pressure switch when the blower rotates at different speeds are different, only one wind pressure switch will not be able to ensure the safety of using the gas wall-mounted boiler at different rotation speeds of the blower.

[0005] Based on the above problems, it is necessary to provide a wind pressure switch assembly that can ensure the safety of using the gas wall-mounted boiler at different rotation speeds of the blower. Summary of the Invention

[0006] The object of the present invention is to overcome the deficiencies of the prior art and propose an improved wind pressure switch assembly and a control method for a gas wall-mounted boiler including the wind pressure switch assembly.

[0007] The present invention discloses a wind pressure switch assembly for a gas wall-mounted boiler, where the gas wall-mounted boiler includes a blower with multiple operating speeds. Among them, the wind pressure switch assembly includes: multiple wind pressure switches, each of the multiple wind pressure switches including a first detection port and a second detection port; a pressure taking device, the pressure taking device including a first pressure taking port and a second pressure taking port; and a connecting pipe, the connecting pipe including a first connecting pipe and a second connecting pipe. The first detection port of each of the multiple wind pressure switches is communicated with the first pressure taking port of the pressure taking device via the first connecting pipe, and the second detection port of each of the multiple wind pressure switches is communicated with the second pressure taking port of the pressure taking device via the second connecting pipe. Among them, each of the multiple wind pressure switches corresponds to each of the multiple operating speeds of the blower, and the start-up pressure difference / shut-down pressure difference of each of the multiple wind pressure switches is set according to the corresponding one of the multiple operating speeds of the blower respectively.

[0008] The wind pressure switch assembly according to the present invention includes multiple wind pressure switches, which can be used for a gas wall-mounted boiler with a blower having multiple operating speeds. Each of the multiple wind pressure switches corresponds to each of the multiple operating speeds of the blower respectively, so as to ensure the use safety of the gas wall-mounted boiler at the multiple operating speeds of the blower.

[0009] The present invention also discloses a gas wall-mounted boiler including the above-mentioned wind pressure switch assembly, which includes a blower with multiple operating speeds. Among them, the multiple wind pressure switches and the pressure taking device are respectively fixedly installed in the housing and the exhaust passage of the gas wall-mounted boiler.

[0010] The present invention also discloses a control method for the above-mentioned gas wall-mounted boiler. The gas wall-mounted boiler further includes a control unit electrically connected to the multiple wind pressure switches of the wind pressure switch assembly. The control method is characterized by including the following steps: after receiving a command to start the gas wall-mounted boiler, the control unit turns on the blower and monitors the state of each of the multiple wind pressure switches; when it is monitored that each of the multiple wind pressure switches closes within T1 seconds, the control unit controls the gas wall-mounted boiler to enter a combustion state; during the combustion process of the gas wall-mounted boiler, the control unit sets the operating speed of the blower to a first operating speed V1 according to the use demand and monitors the state of the first wind pressure switch corresponding to the first operating speed V1 among the multiple wind pressure switches; and when it is monitored that the first wind pressure switch is in a closed state, the control unit controls the gas wall-mounted boiler to continue operating in the current state; when it is monitored that the first wind pressure switch is disconnected, the control unit controls the alarm to sound an alarm and shuts down the gas wall-mounted boiler. Description of the Drawings

[0011] The accompanying drawings of the specification are provided to help the reader understand the present invention more thoroughly. Throughout the accompanying drawings of the specification, the same or similar reference numerals denote the same or similar components, where:

[0012] Figure 1 is a schematic diagram of the configuration of a wind pressure switch assembly in the prior art;

[0013] Figure 2 is a schematic structural diagram of the wind pressure switch of the wind pressure switch assembly, which shows the relative positional relationship between the pressure detection port and the electrical connection point of the wind pressure switch;

[0014] Figure 3 is a schematic diagram of the connection between the wind pressure switch of the wind pressure switch assembly and the control unit;

[0015] Figure 4 is a schematic diagram of the configuration of a wind pressure switch assembly according to an embodiment of the present invention;

[0016] Figure 5a and Figure 5b are schematic diagrams of the connection between two wind pressure switches of the wind pressure switch assembly and the control unit; and

[0017] Figure 6 is a flowchart of a method for controlling a gas wall-mounted boiler according to an embodiment of the present invention.

[0018] Reference numerals in the figures: 1. Wind pressure switch; 1a. Positive pressure detection port; 1b. Negative pressure detection port; 2, 8. Pressure taking device; 2a. Positive pressure taking port; 2b. Negative pressure taking port; 3, 9. Connecting pipe; 3a. Positive pressure pipe; 3b. Negative pressure pipe; 4a. Positive pressure chamber; 4b. Negative pressure chamber; 5. Partition member; 6. First wind pressure switch; 7. Second wind pressure switch; 6a, 7a. First detection port; 6b, 7b. Second detection port; 8a. First pressure taking port; 8b. Second pressure taking port; 9a. First connecting pipe; 9b. Second connecting pipe; 10. Control unit Detailed implementation manners

[0019] The present invention will be described below through specific embodiments. It should be understood that the provision of specific embodiments is only for the purpose of facilitating a thorough understanding of the present invention and is not intended to limit the present invention. Therefore, the following embodiments are only exemplary, and the protection scope of the present invention is only defined by the appended claims.

[0020] Figure 1 Schematically shows the configuration of a wind pressure switch assembly in the prior art. As shown in the figure, the wind pressure switch assembly includes a wind pressure switch 1, a pressure taking device 2, and a connecting pipe 3 connecting the wind pressure switch 1 and the pressure taking device 2. The connecting pipe 3 includes a positive pressure pipe 3a and a negative pressure pipe 3b.

[0021] The air pressure switch 1 generally includes a positive pressure detection port 1a and a negative pressure detection port 1b, and its cavity is thus divided into a positive pressure chamber 4a and a negative pressure chamber 4b. The two chambers are separated by a partition member 5, and the partition member 5 may be a diaphragm on which a micro switch is installed. Wherein, the diaphragm deforms with the pressure difference between the positive pressure chamber 4a and the negative pressure chamber 4b, thereby driving the micro switch to open and / or close. In addition, the air pressure switch 1 further includes a positive electrical connection point 1c and a negative electrical connection point 1d, and the relative positional relationship between the positive electrical connection point 1c and the negative electrical connection point 1d and the above-mentioned pressure detection ports 1a, 1b is as Figure 2 shown. Wherein, the positive electrical connection point 1c and the negative electrical connection point 1d are respectively connected to the corresponding connection points of the control unit 10 through wires, so as to send the state (closed / open) of the air pressure switch 1 to the control unit 10 in the form of electrical signals, as Figure 3 shown. The control unit 10 may be a printed circuit board (PCB).

[0022] Return Figure 1 , the pressure taking device 2 is generally a Venturi tube, and the Venturi tube includes an inlet section, a contraction section, a throat and a diffusion section. The pressure taking device 2 includes a positive pressure taking port 2a and a negative pressure taking port 2b respectively located at the inlet and the throat of the Venturi tube. One end of the positive pressure pipe 3a is connected to the positive pressure detection port 1a of the air pressure switch 1, and the other end is connected to the positive pressure taking port 2a of the pressure taking device 2; one end of the negative pressure pipe 3b is connected to the negative pressure detection port 1b of the air pressure switch 1, and the other end is connected to the negative pressure taking port 2b of the pressure taking device 2.

[0023] Generally, the air pressure switch 1 of the air pressure switch assembly is installed in the shell of the gas wall-mounted boiler, and the pressure taking device 2 is installed in the exhaust passage downstream of the fan. When the fan is running, the air flow discharged through the exhaust passage (including the air flow in the start-up stage of the gas wall-mounted boiler and the high-temperature smoke flow in its continuous operation stage) flows through the pressure taking device 2 along the direction shown by the arrow in the figure, so that the air pressure at the positive pressure taking point 2a and the negative pressure taking point 2b thereof changes. The air pressure switch 1 and the pressure taking device 2 are in fluid communication via the positive pressure pipe 3a and the negative pressure pipe 3b, so that when the air pressure at the positive pressure taking port 2a and the negative pressure taking port 2b of the pressure taking device 2 changes, the air pressure in the positive pressure chamber 4a and the negative pressure chamber 4b of the air pressure switch 1 changes accordingly.

[0024] Figure 1The air pressure switch assembly shown is applicable to the case where the fan has only one operating speed V1. The working process will be described in detail below. First, when the fan is not started, the pressures at the positive pressure tapping 2a and the negative pressure tapping 2b of the pressure taking device 2 are the same (both are atmospheric pressure). Therefore, there is no pressure difference on both sides of the partition 5 of the air pressure switch 1, and it remains in the open state accordingly. When the fan starts and operates at speed V1, the air flow passing through the pressure taking device 2 causes the air pressure at the positive pressure tapping 2a to be greater than the atmospheric pressure (i.e., positive pressure), and the air pressure at the negative pressure tapping 2b to be less than the atmospheric pressure (i.e., negative pressure). Therefore, a pressure difference is formed on both sides of the partition 5 of the air pressure switch 1, and this pressure difference is greater than the start-up pressure difference of the air pressure switch 1. Under the action of this pressure difference, the partition 5 moves towards the negative pressure chamber 4b side and touches the micro switch. Thus, the air pressure switch 1 closes and transmits an electrical signal to the control unit 10. The control unit 10 then opens the gas valve, and the gas enters the combustion chamber of the gas wall-mounted boiler and starts to burn. At this time, the gas wall-mounted boiler enters the continuous operation stage, and the air flow passing through the pressure taking device 2 is the high-temperature flue gas flow generated by combustion. During the continuous operation stage of the gas wall-mounted boiler, if the fan stops rotating accidentally, the speed decreases, or the intake and exhaust passages are blocked, resulting in insufficient exhaust volume or inability to exhaust, the flow rate of the high-temperature flue gas flow passing through the pressure taking device 2 will decrease. As a result, the air pressure at the positive pressure tapping 2a decreases and the air pressure at the negative pressure tapping 2b increases. Therefore, the pressure difference on both sides of the partition 5 will decrease. When this pressure difference decreases to be lower than the shutdown pressure difference of the air pressure switch 1, the air pressure switch 1 will disconnect. Therefore, it no longer transmits an electrical signal to the control unit 10. The control unit 10 responds to no longer receiving an electrical signal from the air pressure switch 1 and closes the gas valve, causing the gas wall-mounted boiler to stop operating.

[0025] As can be seen from the above working process, the start-up pressure difference / shutdown pressure difference of the air pressure switch 1 is set according to the operating speed V1 of the fan, so that when the fan operates at this speed V1, the air pressure switch 1 closes, and when an accident such as a blockage of the intake and exhaust passages occurs, the air pressure switch 1 disconnects, thereby achieving the purpose of ensuring the use safety of the gas wall-mounted boiler.

[0026] However, in some cases, it may be necessary for the blower to operate at different speeds. For example, when the gas wall-mounted boiler operates at a lower power, the blower needs to operate at a speed V2 less than the speed V1, thereby improving the operating efficiency of the gas wall-mounted boiler. However, when the blower operates at the lower speed V2, the speed of the air flow passing through the pressure-taking device 2 will also decrease accordingly, resulting in a decrease in the pressure difference formed on both sides of the partition member 5. If the pressure difference at this time is less than the start-up pressure difference of the pressure switch 1, the pressure switch 1 will not be able to close, and the gas wall-mounted boiler will not be able to start operating. Or, when it is necessary for the blower to operate at a speed V3 greater than the speed V1, although the pressure difference formed on both sides of the partition member 5 is greater than the start-up pressure difference at this time and thus the gas wall-mounted boiler can start operating, however, since the pressure difference on both sides of the partition member 5 is too large at this time, when the blower speed accidentally decreases or the intake and exhaust passages are partially blocked, even if the pressure difference will decrease, it may still be greater than the shutdown pressure difference of the pressure switch 1. Therefore, the pressure switch 1 will not be able to disconnect. At this time, the gas wall-mounted boiler will continue to operate in this fault state, resulting in an increase in the indoor carbon monoxide concentration, thus threatening the personal safety of the user.

[0027] In view of the above problems, the present invention proposes an improved pressure switch assembly, which can be used for a gas wall-mounted boiler with a blower having multiple operating speeds to ensure the use safety of the gas wall-mounted boiler at different operating speeds of the blower.

[0028] The pressure switch assembly according to an embodiment of the present invention includes: a plurality of pressure switches, each of the plurality of pressure switches including a first detection port and a second detection port; a pressure-taking device, the pressure-taking device including a first pressure-taking port and a second pressure-taking port; and a connecting pipe, the connecting pipe including a first connecting pipe and a second connecting pipe. The first detection port of each of the plurality of pressure switches is communicated with the first pressure-taking port of the pressure-taking device via the first connecting pipe, and the second detection port of each of the plurality of pressure switches is communicated with the second pressure-taking port of the pressure-taking device via the second connecting pipe. Wherein, each of the plurality of pressure switches corresponds to each of the multiple operating speeds of the blower, and the start-up pressure difference / shutdown pressure difference of each of the plurality of pressure switches is set according to the corresponding one of the multiple operating speeds of the blower respectively.

[0029] In a preferred embodiment according to the present invention, both the first pressure-taking port and the second pressure-taking port of the pressure-taking device are negative pressure-taking ports to prevent the high-temperature flue gas flowing through the pressure-taking device from flowing into the connecting pipe to form condensed water. At this time, the pressure-taking device can be formed by two venturi tubes with different sizes, and the first pressure-taking port and the second pressure-taking port are respectively arranged at the throats of the two venturi tubes.

[0030] Alternatively, the first pressure-taking port and the second pressure-taking port of the pressure-taking device are a positive pressure-taking port and a negative pressure-taking port respectively.

[0031] Figure 4 A wind pressure switch assembly according to an embodiment of the present invention is shown. The wind pressure switch assembly includes a first wind pressure switch 6 and a second wind pressure switch 7, and the first wind pressure switch 6 and the second wind pressure switch 7 each include a first detection port 6a, 7a and a second detection port 6b, 7b. In addition, as shown in FIG. 5, the first wind pressure switch 6 and the second wind pressure switch 7 each include a positive electrical connection point 6c, 7c and a negative electrical connection point 6d, 7d, which are respectively connected to a control unit 10 through wires.

[0032] Figure 5a and Figure 5b respectively show two different connection methods.

[0033] In Figure 5a , the negative electrical connection points 6d, 7d of the first wind pressure switch 6 and the second wind pressure switch 7 are connected to the same negative electrical connection point 10d of the control unit 10, while the positive electrical connection points 6c, 7c are connected to different positive electrical connection points 10c 1 , 10c 2 of the control unit 10. At this time, the control unit 10 determines the closed / open state of the first wind pressure switch 6 by whether there is an electrical signal between the connection points 10c 1 and 10d, and determines the closed / open state of the second wind pressure switch 7 by whether there is an electrical signal between the connection points 10c 2 and 10d.

[0034] In Figure 5b , the positive electrical connection points 6c, 7c and the negative electrical connection points 6d, 7d of the first wind pressure switch 6 and the second wind pressure switch 7 are respectively connected to different positive electrical connection points 10c 1 , 10c 2 and different negative electrical connection points 10d 1 , 10d 2 of the control unit 10. At this time, the control unit 10 determines the closed / open state of the first wind pressure switch 6 by whether there is an electrical signal between the connection points 10c 1 and 10d 1 , and determines the closed / open state of the second wind pressure switch 7 by whether there is an electrical signal between the connection points 10c 2 and 10d 2 .

[0035] Those skilled in the art will understand that the first air pressure switch 6 and the second air pressure switch 7 can also share the same positive electrical connection point on the control unit 10. That is to say, there are various connection methods between the electrical connection points of the first air pressure switch 6 and the second air pressure switch 7 and the control unit 10, as long as the control unit 10 can distinguish the closed / open states of the first air pressure switch 6 and the second air pressure switch 7 through this connection method.

[0036] Refer again to Figure 4 , the air pressure switch assembly further includes a pressure-taking device 8, and the pressure-taking device 8 includes a first pressure-taking port 8a and a second pressure-taking port 8b. In addition, the air pressure switch assembly further includes a connecting pipe 9, and the connecting pipe 9 includes a first connecting pipe 9a and a second connecting pipe 9b. The first connecting pipe 9a includes three connection ends, which are respectively connected to the first detection port 6a of the first air pressure switch 6, the first detection port 7a of the second air pressure switch 7, and the first pressure-taking port 8a of the pressure-taking device 8. The second connecting pipe 9b also includes three connection ends, which are respectively connected to the second detection port 6b of the first air pressure switch 6, the second detection port 7b of the second air pressure switch 7, and the second pressure-taking port 8a of the pressure-taking device 8, so as to realize the fluid communication between the pressure-taking device 8 and the first air pressure switch 6 and the second air pressure switch 7. In other words, the first air pressure switch 6 and the second air pressure switch 7 share a pressure-taking device 8. Among them, the start-up pressure difference and the shutdown pressure difference of the first air pressure switch 6 are set according to the first operating speed V1 of the blower, and the start-up pressure difference and the shutdown pressure difference of the second air pressure switch 7 are set according to the second operating speed V2 of the blower that is less than the first operating speed V1. Among them, the first operating speed V1 and the second operating speed V2 can represent two different speed values or two different speed ranges.

[0037] When the blower of the gas wall-mounted boiler is set to operate at a relatively large first operating speed V1, the gas wall-mounted boiler will realize start-up / shutdown through the closing / opening of the first air pressure switch 6 corresponding to the first operating speed V1. Similarly, when the blower of the gas wall-mounted boiler is set to operate at a relatively small second operating speed V2 (for example, when the heating demand decreases and the power of the gas wall-mounted boiler decreases accordingly), the gas wall-mounted boiler will realize start-up / shutdown through the closing / opening of the second air pressure switch 7 corresponding to the second operating speed V2. That is to say, the first air pressure switch 6 and the second air pressure switch 7 independently function at different operating speeds V1 and V2 of the blower to ensure the use safety of the gas wall-mounted boiler.

[0038] Next, refer to Figure 6 Describe a control method 100 for a gas wall-mounted boiler including the above air pressure switch assembly.

[0039] The control method 100 starts at step 101, where the user inputs a command to start the gas wall-mounted boiler. For example, the user can input the command to start the gas wall-mounted boiler by pressing a button or touching the display screen.

[0040] Then, the method proceeds to step 103, where the control unit 10 turns on the blower and makes it operate at the startup speed, and at the same time starts to monitor the states of both the first air pressure switch 6 and the second air pressure switch 7.

[0041] Subsequently, in step 105, the control unit 10 monitors whether the first air pressure switch 6 and the second air pressure switch 7 close within T1 seconds. The function of this step is to check whether the blower and the air pressure switch assembly can work properly. If the control unit 10 monitors that both the first air pressure switch 6 and the second air pressure switch 7 close within T1 seconds, it means that both the blower and the air pressure switch assembly of the gas wall-mounted boiler can work properly. Therefore, the method will proceed to step 107, which will be described in detail below. However, if the control unit 10 monitors that the first air pressure switch 6 and / or the second air pressure switch does not close within T1 seconds, it means that there is a fault with the blower of the gas wall-mounted boiler or the first air pressure switch and / or the second air pressure switch. At this time, the method will proceed to step 108, where the control unit 10 controls the alarm connected to it to give an alarm and shuts down the gas wall-mounted boiler.

[0042] In step 107, the control unit 10 will control the blower to keep running, open the safety valve, make the gas wall-mounted boiler enter the combustion state, and continuously monitor the states of the first air pressure switch 6 and the second air pressure switch 7.

[0043] Subsequently, according to actual usage needs, the control unit 10 can set the blower to operate at speed V1 or V2.

[0044] When the control unit 10 sets the blower to operate at speed V1, it can only monitor the state of the first air pressure switch 6. Specifically, as shown in step 109 in Figure 6 , the control unit 10 monitors whether the first air pressure switch 6 changes from the closed state to the open state. If the control unit 10 monitors that the first air pressure switch 6 opens, it means that there is a fault such as a blockage in the exhaust passage. Subsequently, the method proceeds to step 113, which will be described in detail below. If the control unit 10 monitors that the first air pressure switch 6 remains in the closed state, it means that the gas wall-mounted boiler is operating normally, and the control unit 10 only needs to keep the gas wall-mounted boiler running in this state (step 115) until the control unit 10 receives a command from the user to turn off the gas wall-mounted boiler (step 117).

[0045] Similarly, when the control unit 10 sets the blower to operate at speed V2, it can only monitor the state of the second air pressure switch 7. Specifically, the control unit 10 monitors whether the second air pressure switch 7 changes from the closed state to the open state, as shown in step 111 of Figure 6 Figure 1. If the control unit 10 monitors that the second air pressure switch 7 is open, it indicates that a fault such as a blocked exhaust passage has occurred, and then the method proceeds to step 113. If the control unit 10 monitors that the second air pressure switch 7 remains closed, it indicates that the gas wall-mounted boiler is operating normally, and the control unit 10 only needs to keep the gas wall-mounted boiler running in this state (step 115) until the control unit 10 receives a command from the user to turn off the gas wall-mounted boiler (step 117).

[0046] At step 113, the control unit 10 monitors whether the first air pressure switch 6 or the second air pressure switch 7 that has been opened re-closes within T2 seconds. The purpose of this step is to determine whether the fault that caused the first air pressure switch 6 or the second air pressure switch 7 to open is a transient fault. If the first air pressure switch 6 or the second air pressure switch 7 does not re-close within T2 seconds, it indicates that the fault is not temporary, so the method proceeds to step 108. At this step, the control unit 10 controls the alarm connected to it to emit an alarm and shuts down the gas wall-mounted boiler. If the first air pressure switch 6 or the second air pressure switch 7 re-closes within T2 seconds, it indicates that the fault is temporary. At this time, the method proceeds to step 115. At this step, the control unit 10 will control the gas wall-mounted boiler to continue running in the current state, thus avoiding frequent alarms and / or shutdowns of the gas wall-mounted boiler caused by transient faults.

[0047] In addition, according to the actual usage needs of the gas wall-mounted boiler, the method may further include the step of the control unit 10 changing the speed of the blower from V1 to V2 or from V2 to V1.

[0048] Among them, since the first operating speed V1 is greater than the second operating speed V2, the start-up pressure difference of the first air pressure switch 6 is greater than the start-up pressure difference of the second air pressure switch 7, and the shutdown pressure difference of the first air pressure switch is greater than the shutdown pressure difference of the second air pressure switch.

[0049] Preferably, the connecting pipe 9 is hermetically connected to the first air pressure switch 6, the second air pressure switch 7, and the pressure-taking device 8 to ensure the airtightness of the air pressure switch assembly, thereby improving the detection accuracy of the air pressure switch assembly.

[0050] Preferably, the first detection ports 6a, 7a and the second detection ports 6b, 7b of each of the first air pressure switch 6 and the second air pressure switch 7 are both arranged to face downward, so as to prevent foreign matters from entering the first air pressure switch 6 and the second air pressure switch 7 through the connecting pipe 9 and affecting the normal use of the first air pressure switch 6 and the second air pressure switch 7.

[0051] Preferably, the connecting pipe 9 is a flexible pipe, so that the installation positions of the air pressure switches 6, 7 in the housing of the gas wall-mounted boiler can be flexibly selected as required. Further, the connecting pipe 9 can be made of silicone rubber.

[0052] In other embodiments according to the present invention, the plurality of air pressure switch assemblies may include three or more air pressure switches for a gas wall-mounted boiler in which the blower has three or more operating speeds.

[0053] The present invention also discloses a gas wall-mounted boiler including the above air pressure switch assembly, wherein the plurality of air pressure switches and the pressure-taking device are respectively fixedly installed in the housing and the exhaust passage of the gas wall-mounted boiler.

[0054] Preferably, the housing of the gas wall-mounted boiler includes an air pressure switch mounting seat, and the plurality of air pressure switches are mounted on the air pressure switch mounting seat by snap fit. Thereby, the installation process of the plurality of air pressure switches can be simplified.

[0055] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention are only used to distinguish similar objects and are not used to describe a specific order or sequence. It should be understood that the objects labeled with "first", "second", etc. can be interchanged under appropriate circumstances.

[0056] Although the specific embodiments of the present invention are disclosed above, those skilled in the art can understand that various modifications, substitutions and changes can be made without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention is not limited to the above specific embodiments, but is only defined by the appended claims.

Claims

1. A wind pressure switch assembly for a gas wall-mounted boiler, the gas wall-mounted boiler including a blower having multiple operating speeds, Characterized in that, The wind pressure switch assembly includes: Multiple wind pressure switches (6, 7), each of the multiple wind pressure switches (6, 7) including a first detection port (6a, 7a) and a second detection port (6b, 7b); A pressure-taking device (8), the pressure-taking device (8) including a first pressure-taking port (8a) and a second pressure-taking port (8b); and A connecting pipe (9), the connecting pipe (9) including a first connecting pipe (9a) and a second connecting pipe (9b), the first detection port (6a, 7a) of each of the multiple wind pressure switches (6, 7) being communicated with the first pressure-taking port (8a) of the pressure-taking device (8) via the first connecting pipe (9a), and the second detection port (6b, 7b) of each of the multiple wind pressure switches (6, 7) being communicated with the second pressure-taking port (8b) of the pressure-taking device (8) via the second connecting pipe (9b), Wherein, each of the multiple wind pressure switches (6, 7) corresponds to each of the multiple operating speeds of the blower, and the start-up pressure difference / shut-down pressure difference of each of the multiple wind pressure switches (6, 7) is set according to a corresponding one of the multiple operating speeds of the blower respectively, Wherein, both the first pressure-taking port (8a) and the second pressure-taking port (8b) of the pressure-taking device (8) are negative pressure-taking ports.

2. The wind pressure switch assembly according to claim 1, Characterized in that, The pressure-taking device (8) is formed by two venturi tubes with different sizes, and the first pressure-taking port (8a) and the second pressure-taking port (8b) are respectively arranged at the throats of the two venturi tubes.

3. The wind pressure switch assembly according to claim 1, Characterized in that, The multiple wind pressure switches (6, 7) include a first wind pressure switch (6) and a second wind pressure switch (7) corresponding to the first operating speed V1 and the second operating speed V2 of the blower respectively. The first connecting pipe (9a) includes three connection ends, which are respectively connected to the first detection port (6a) of the first wind pressure switch (6), the first detection port (7a) of the second wind pressure switch (7), and the first pressure-taking port (8a) of the pressure-taking device (8). The second connecting pipe (9b) also includes three connection ends, which are respectively connected to the second detection port (6b) of the first wind pressure switch (6), the second detection port (7b) of the second wind pressure switch (7), and the second pressure-taking port (8b) of the pressure-taking device (8).

4. The wind pressure switch assembly according to claim 3, Characterized in that, When the blower is set to operate at the first operating speed V1, the gas wall-mounted boiler realizes start-up / shut-down through the closing / opening of the first wind pressure switch (6); and when the blower is set to operate at the second operating speed V2, the gas wall-mounted boiler realizes start-up / shut-down through the closing / opening of the second wind pressure switch (7).

5. The wind pressure switch assembly according to claim 4, It is characterized in that the first operating speed V1 of the blower is greater than the second operating speed V2, and the start-up pressure difference of the first air pressure switch (6) is greater than the start-up pressure difference of the second air pressure switch (7), and the shutdown pressure difference of the first air pressure switch (6) is less than the shutdown pressure difference of the second air pressure switch (7).

6. The air pressure switch assembly according to claim 3, It is characterized in that the first detection ports (6a, 7a) and the second detection ports (6b, 7b) of each of the first air pressure switch (6) and the second air pressure switch (7) are both arranged to face downward.

7. A gas wall-mounted boiler, which includes the air pressure switch assembly according to any one of the above claims 1-6 and a blower having multiple operating speeds, wherein the multiple air pressure switches (6, 7) and the pressure-taking device (8) are respectively fixedly installed in the housing of the gas wall-mounted boiler and the exhaust passage.

8. A control method for the gas wall-mounted boiler according to claim 7, the gas wall-mounted boiler further includes a control unit (10) electrically connected to the multiple air pressure switches (6, 7) of the air pressure switch assembly, It is characterized in that the control method includes the following steps: After receiving the command to start the gas wall-mounted boiler, the control unit (10) turns on the blower and monitors the state of each of the multiple air pressure switches (6, 7); When it is monitored that each of the multiple air pressure switches (6, 7) closes within T1 seconds, the control unit (10) controls the gas wall-mounted boiler to enter the combustion state; During the combustion process of the gas wall-mounted boiler, the control unit (10) sets the operating speed of the blower to the first operating speed V1 according to the usage requirements, and monitors the state of the first air pressure switch (6) corresponding to the first operating speed V1 among the multiple air pressure switches (6, 7); and When it is monitored that the first air pressure switch (6) is in the closed state, the control unit (10) controls the gas wall-mounted boiler to continue running in the current state; when it is monitored that the first air pressure switch (6) is disconnected, the control unit (10) controls the alarm to sound an alarm and shuts down the gas wall-mounted boiler.

9. The control method for the gas wall-mounted boiler according to claim 8, It is characterized in that When the control unit (10) monitors that any one of the multiple air pressure switches (6, 7) does not close within T1 seconds, the control unit (10) controls the alarm to sound an alarm.

10. The control method for the gas wall-mounted boiler according to claim 8 or 9, It is characterized in that the control method further includes the following steps: After monitoring that the first air pressure switch (6) is disconnected, the control unit (10) further monitors whether the disconnected first air pressure switch (6) re-closes within T2 seconds. If so, the control unit (10) controls the gas wall-mounted boiler to continue running in the current state until receiving the command to shut down the gas wall-mounted boiler.

11. The control method for the gas wall-mounted boiler according to claim 8 or 9, It is characterized in that The method further includes the following steps: during the combustion process of the gas wall-mounted boiler, the control unit (10) changes the operating speed of the blower from a first operating speed V1 to a second operating speed V2 according to the usage requirements, and monitors the state of the second pressure switch (7) corresponding to the second operating speed V2 among the plurality of pressure switches (6, 7).

12. The control method for a gas wall-mounted boiler according to claim 11, wherein, the first operating speed V1 and / or the second operating speed V2 of the blower represent a single speed value or a speed range.

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