CN113932452A - Wind pressure switch assembly, gas wall-mounted furnace comprising wind pressure switch assembly and control method of gas wall-mounted furnace - Google Patents
Wind pressure switch assembly, gas wall-mounted furnace comprising wind pressure switch assembly and control method of gas wall-mounted furnace Download PDFInfo
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- CN113932452A CN113932452A CN202010673947.4A CN202010673947A CN113932452A CN 113932452 A CN113932452 A CN 113932452A CN 202010673947 A CN202010673947 A CN 202010673947A CN 113932452 A CN113932452 A CN 113932452A
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- wind pressure
- pressure switch
- gas wall
- pressure
- wind
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
- F24H9/2035—Arrangement or mounting of control or safety devices for water heaters using fluid fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N3/00—Regulating air supply or draught
- F23N3/06—Regulating air supply or draught by conjoint operation of two or more valves or dampers
Abstract
The invention discloses a wind pressure switch assembly, a wall-mounted gas stove comprising the wind pressure switch assembly and a control method for the wall-mounted gas stove. The wind pressure switch assembly is used for a gas wall-mounted furnace comprising a fan with a plurality of running speeds, and comprises a plurality of wind pressure switches, a pressure taking device and a connecting pipe. The first detection port of each of the plurality of wind pressure switches is communicated with the first pressure taking port of the pressure taking device through a first connection pipe, the second detection port of each of the plurality of wind pressure switches is communicated with the second pressure taking port of the pressure taking device through a second connection pipe, wherein each of the plurality of wind pressure switches corresponds to each of a plurality of operating speeds of the fan, and the start-up pressure difference/the shut-down pressure difference of each of the plurality of wind pressure switches is set according to a corresponding one of the plurality of operating speeds of the fan. The wind pressure switch assembly can ensure the use safety of the gas wall-mounted boiler at a plurality of running speeds of the fan.
Description
Technical Field
The invention relates to a wall-mounted gas stove, in particular to a wind pressure switch assembly for the wall-mounted gas stove, the wall-mounted gas stove comprising the wind pressure switch assembly and a control method of the wall-mounted gas stove.
Background
The gas hanging stove usually includes the fan and with the wind pressure switch subassembly of fan combination use, when the fan unexpected stall, rotational speed reduce or advance the exhaust passage and block up and lead to the displacement not enough or when unable exhaust, the wind pressure switch will automatic disconnection, therefore the control unit makes the gas hanging stove stop operation to ensure the safety in utilization of gas hanging stove.
The wind pressure switch assembly in a conventional gas wall-hanging stove generally includes only one wind pressure switch (i.e., a wind pressure sensor) having a set of a power-ON pressure difference and a power-OFF pressure difference (i.e., ON/OFF points), and the power-ON pressure difference is greater than the power-OFF pressure difference. The set of start-up pressure differential/shut-down pressure differential corresponds to an operating speed V of the fan. In the starting stage of the gas wall-mounted boiler, when the speed of the fan gradually rises to the running speed V, the pressure difference in the air pressure switch reaches the starting pressure difference, so that the air pressure switch is closed, and the control unit enables the gas wall-mounted boiler to start running; at the continuous operation stage of gas hanging stove, when the fan unexpected shut down, the rotational speed reduces or advance the exhaust passage to block up and lead to the displacement not enough or when unable exhaust, the pressure differential in the wind pressure switch reduces to its shutdown pressure differential gradually, consequently the wind pressure switch disconnection leads to the control unit to make gas hanging stove stall to avoid exhausting unobstructed and lead to indoor carbon monoxide concentration to rise, cause the threat to user's personal safety.
However, the wind pressure switch assembly is only suitable for the case that the fan of the gas wall-hanging stove has one operation speed. With the development of the related art of the gas wall-hanging stove, in order to improve the operation efficiency thereof or perform the segmental combustion control thereof, the fan may be required to be operated at different speeds under different conditions. At this time, because the pressure difference formed in the wind pressure switch is different when the fan operates at different speeds, only one wind pressure switch can not ensure the use safety of the gas wall-hanging stove at different operating speeds of the fan.
In view of the above, it is desirable to provide a wind pressure switch assembly capable of ensuring safety in use of a gas wall-hanging stove at different operating speeds of a fan.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an improved wind pressure switch assembly and a control method for a gas wall-hanging stove comprising the wind pressure switch assembly.
The invention discloses a wind pressure switch assembly, which is used for a wall-mounted gas stove, wherein the wall-mounted gas stove comprises a fan with a plurality of running speeds, and the wind pressure switch assembly comprises: a plurality of wind pressure switches, each of the plurality of wind pressure switches including a first detection port and a second detection port; the pressure measuring device comprises a first pressure measuring port and a second pressure measuring port; and a connection pipe, the connection pipe including a first connection pipe and a second connection pipe, a first detection port of each of the plurality of wind pressure switches via the first connection pipe with a first pressure taking port of the pressure taking device communicates, and a second detection port of each of the plurality of wind pressure switches via the second connection pipe with a second pressure taking port of the pressure taking device communicates, wherein each of the plurality of wind pressure switches corresponds to each of a plurality of operating speeds of the fan, respectively, and a power-on/power-off pressure difference of each of the plurality of wind pressure switches is set according to a corresponding one of the plurality of operating speeds of the fan, respectively.
The wind pressure switch assembly according to the present invention includes a plurality of wind pressure switches that can be used for a gas wall-hanging stove having a fan with a plurality of operating speeds, each of the plurality of wind pressure switches corresponding to each of the plurality of operating speeds of the fan, respectively, so that the safety of use of the gas wall-hanging stove can be ensured at the plurality of operating speeds of the fan.
The invention also discloses a gas wall-mounted furnace comprising the wind pressure switch assembly, which comprises a fan with a plurality of running speeds, wherein the wind pressure switches and the pressure taking device are respectively and fixedly arranged in a shell and an exhaust channel of the gas wall-mounted furnace.
The invention also discloses a control method for the wall-mounted gas stove, and the wall-mounted gas stove further comprises a control unit electrically connected with the plurality of wind pressure switches of the wind pressure switch assembly, and is characterized in that the control method comprises the following steps: after receiving a command for starting the gas wall-hanging stove, the control unit starts the fan and monitors the state of each of the plurality of wind pressure switches; when each of the plurality of wind pressure switches is monitored to be closed within T1 seconds, the control unit controls the gas wall hanging stove to enter a combustion state; during the combustion process of the gas wall hanging stove, the control unit sets the operating speed of the fan to be a first operating speed V1 according to the use requirement, and monitors the state of a first wind pressure switch corresponding to the first operating speed V1 in the plurality of wind pressure switches; when the first wind pressure switch is monitored to be in a closed state, the control unit controls the gas wall-mounted boiler to continuously operate in the current state; when the first wind pressure switch is monitored to be disconnected, the control unit controls the alarm to give an alarm, and the gas wall-mounted furnace is stopped.
Drawings
The accompanying drawings are provided to assist the reader in a more thorough understanding of the invention. Throughout the specification, the same or similar reference numbers refer to the same or similar parts, wherein:
FIG. 1 is a schematic view of a prior art configuration of a wind pressure switch assembly;
FIG. 2 is a schematic structural view of a wind pressure switch of the wind pressure switch assembly, showing the relative positional relationship between the pressure detection port and the electrical connection point of the wind pressure switch;
FIG. 3 is a schematic view of the connection of a wind pressure switch of the wind pressure switch assembly to a control unit;
FIG. 4 is a schematic view of a configuration of a wind pressure switch assembly according to one embodiment of the present invention;
FIGS. 5a and 5b are schematic views of the connection of two wind pressure switches of the wind pressure switch assembly to a control unit; and
fig. 6 is a flowchart of a method for controlling a gas wall-hanging stove according to an embodiment of the present invention.
Reference numbers in the figures: 1. a wind pressure switch; 1a, a positive pressure detection port; 1b, a negative pressure detection port; 2,8, a pressure measuring device; 2a, a positive pressure taking port; 2b, a negative pressure taking port; 3,9. connecting pipe; 3a, a positive pressure pipe; 3b, a negative pressure pipe; 4a, a positive pressure cavity; 4b, a negative pressure cavity; 5. a separator; 6. a first wind pressure switch; 7. a second wind pressure switch; 6a,7a. a first detection port; 6b,7b. a second detection port; 8a, a first pressure taking port; 8b, a second pressure taking port; 9a. a first connecting tube; 9b. a second connecting pipe; 10. control unit
Detailed Description
The invention is described below by means of specific examples. It should be understood that the detailed description is provided merely for purposes of facilitating a thorough understanding of the present invention and is not intended to limit the present invention. Accordingly, the following examples are illustrative only, and the scope of the present invention is to be defined solely by the appended claims.
Fig. 1 schematically shows a configuration of a wind pressure switch assembly in the related art. As shown in the figure, this wind pressure switch subassembly includes wind pressure switch 1, pressure taking device 2 and connects wind pressure switch 1 with pressure taking device 2's connecting pipe 3, connecting pipe 3 includes positive pressure pipe 3a and negative pressure pipe 3b.
Returning to fig. 1, said pressure taking device 2 is generally a venturi tube comprising an inlet section, a convergent section, a throat and a divergent section, said pressure taking device 2 comprising a positive pressure taking port 2a and a negative pressure taking port 2b located at the inlet and at the throat of the venturi tube, respectively. One end of the positive pressure pipe 3a is connected with a positive pressure detection port 1a of the wind pressure switch 1, and the other end is connected with a positive pressure taking port 2a of the pressure taking device 2; one end of the negative pressure pipe 3b is connected with a negative pressure detection port 1b of the wind pressure switch 1, and the other end is connected with a negative pressure taking port 2b of the pressure taking device 2.
Generally, a wind pressure switch 1 of a wind pressure switch assembly is installed in a housing of a gas wall-hanging stove, and a pressure taking device 2 is installed in an exhaust passage downstream of a fan. When the fan is operated, the airflow discharged through the exhaust passage (including the airflow in the start-up stage of the gas wall-hanging stove and the high-temperature flue gas flow in the continuous operation stage thereof) flows through the pressure taking device 2 in the direction indicated by the arrows in the figure, so that the gas pressures at the positive pressure taking point 2a and the negative pressure taking point 2b thereof are changed. The wind pressure switch 1 is in fluid communication with the pressure taking device 2 via a positive pressure pipe 3a and a negative pressure pipe 3b, such 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 wind pressure switch 1 changes accordingly.
The wind pressure switch assembly shown in fig. 1 is suitable for the case where the fan has only one operating speed V1, and the operation thereof will be described in detail below. First, when the blower is not started, the pressures at the positive pressure taking port 2a and the negative pressure taking port 2b of the pressure taking device 2 are the same (both are atmospheric pressure), so there is no pressure difference across the partition 5 of the wind pressure switch 1, and thus the off-state is maintained. When the blower is started and operated at the speed V1, the air flow passing through the pressure taking device 2 causes the air pressure at the positive pressure taking port 2a to be greater than the atmospheric pressure (i.e., positive pressure) and the air pressure at the negative pressure taking port 2b to be less than the atmospheric pressure (i.e., negative pressure), so that a pressure difference is formed across the partition 5 of the wind pressure switch 1, which is greater than the startup pressure difference of the wind pressure switch 1. The separator 5 moves to one side of the negative pressure cavity 4b under the action of the pressure difference and touches the micro switch, so that the wind pressure switch 1 is closed, an electric signal is transmitted to the control unit 10, the control unit 10 then opens the gas valve, and gas enters a combustion chamber of the gas wall-mounted furnace to start combustion. At this time, the gas wall-hanging stove enters a continuous operation stage, and the airflow flowing through the pressure taking device 2 is the high-temperature flue gas flow generated by combustion. In the continuous operation stage of the gas wall-hanging furnace, if the fan is unexpectedly stopped, the rotating speed is reduced or the air inlet and outlet channel is blocked to cause insufficient air discharge or exhaust failure, the flow rate of the high-temperature flue gas flow passing through the pressure taking device 2 is reduced, so that the air pressure at the positive pressure taking port 2a is reduced and the air pressure at the negative pressure taking port 2b is increased, and therefore, the pressure difference between the two sides of the partition 5 is reduced. When the pressure difference drops to be lower than the shutdown pressure difference of the wind pressure switch 1, the wind pressure switch 1 is disconnected, so that the electric signal is not transmitted to the control unit 10 any more, and the control unit 10 closes the gas valve in response to the electric signal no more being received from the wind pressure switch 1, so that the gas wall-hanging stove stops running.
As can be seen from the above working process, the start-up pressure difference/shutdown pressure difference of the wind pressure switch 1 is set according to the operating speed V1 of the fan, so that the wind pressure switch 1 is closed when the fan operates at the speed V1, and the wind pressure switch 1 is opened when an accident such as blockage of the air intake and exhaust passage occurs, thereby achieving the purpose of ensuring the safety of the gas wall-hanging stove.
However, in some cases, it may be desirable for the fans to operate at different speeds. For example, when the gas wall-hanging stove operates at a low power, the fan is required to operate at a speed V2 that is less than the speed V1, thereby improving the operating efficiency of the gas wall-hanging stove. However, when the fan is operated at a lower speed V2, the speed of the air flow passing through the pressure taking device 2 is also reduced accordingly, thereby causing a reduction in the pressure difference formed across the partition 5, and if the pressure difference is smaller than the starting pressure difference of the wind pressure switch 1, the wind pressure switch 1 cannot be closed, and the gas wall-hanging stove cannot start to operate. Alternatively, when the fan is required to operate at a speed V3 higher than the speed V1, although the pressure difference formed across the partition 5 is larger than the start-up pressure difference and thus the gas wall hanging stove can start to operate, since the pressure difference across the partition 5 is too large at this time, even if the pressure difference is reduced, it may still be larger than the shut-down pressure difference of the wind pressure switch 1 when the rotation speed of the fan is unexpectedly reduced or the intake and exhaust passages are partially blocked, and thus the wind pressure switch 1 cannot be turned off. At this moment, the gas hanging stove will be in this fault condition continuous operation, leads to indoor carbon monoxide concentration to rise to threaten user's personal safety.
In view of the above problems, the present invention provides an improved wind pressure switch assembly, which can be used for a wall-mounted gas stove with a plurality of operating speeds of a fan, so as to ensure the safety of the wall-mounted gas stove in use under different operating speeds of the fan.
The wind pressure switch assembly according to the embodiment of the present invention includes: a plurality of wind pressure switches, each of the plurality of wind pressure switches including a first detection port and a second detection port; the pressure measuring device comprises a first pressure measuring port and a second pressure measuring port; and a connection pipe including a first connection pipe and a second connection pipe, a first detection port of each of the plurality of wind pressure switches being communicated with a first pressure taking port of the pressure taking device via the first connection pipe, and a second detection port of each of the plurality of wind pressure switches being communicated with a second pressure taking port of the pressure taking device via the second connection pipe. Wherein each of the plurality of wind pressure switches corresponds to each of a plurality of operating speeds of the fan, respectively, and a startup pressure difference/shutdown pressure difference of each of the plurality of wind pressure switches is set according to a corresponding one of the plurality of operating speeds of the fan, respectively.
In a preferred embodiment of the present invention, the first pressure taking port and the second pressure taking port of the pressure taking device are both negative pressure taking ports, so as 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 may be formed of two venturi tubes having different sizes, and the first pressure-taking port and the second pressure-taking port are provided at throats of the two venturi tubes, respectively.
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.
Fig. 4 shows a wind pressure switch assembly according to an embodiment of the present invention. The wind pressure switch assembly includes a first wind pressure switch 6 and a second wind pressure switch 7, 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. Further, as shown in fig. 5, the first and second wind pressure switches 6 and 7 each include a positive electrical connection point 6c,7c and a negative electrical connection point 6d,7d, which are connected to the control unit 10 by wires, respectively.
Fig. 5a and 5b show two different connection ways, respectively.
In fig. 5a, the negative electrical connection points 6d,7d of the first and second wind pressure switches 6,7 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 of the control unit 101,10c2. At this time, the control unit 10 passes through a connection point 10c1And 10d, and judges whether the first wind pressure switch 6 is in the on/off state through the connection point 10c2And 10d, whether an electric signal exists or not is judged to judge the closing/opening state of the second wind pressure switch 7.
In fig. 5b, the positive electrical connection points 6c,7c and the negative electrical connection points 6d,7d of the first and second wind pressure switches 6,7 are connected to different positive electrical connection points 10c of the control unit, respectively1,10c2And a different negative electrical connection point 10d1,10d2. At this time, the control unit 10 passes through a connection point 10c1And 10d1Whether there is an electric signal therebetween to judge the on/off state of the first wind pressure switch 6, and through the connection point 10c2And 10d2Whether an electric signal exists between the first wind pressure switch and the second wind pressure switch 7 or not is judged.
Those skilled in the art will appreciate that the first wind pressure switch 6 and the second wind pressure switch 7 can also share the same positive electrical connection point on the control unit 10. That is, there are various connection manners between the electrical connection point of the first wind pressure switch 6 and the second wind pressure switch 7 and the control unit 10 as long as the control unit 10 can distinguish the on/off states of the first wind pressure switch 6 and the second wind pressure switch 7 by the connection manner.
Referring again to fig. 4, the wind 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, this wind pressure switch assembly still includes connecting pipe 9, connecting pipe 9 includes first connecting pipe 9a and second connecting pipe 9b, first connecting pipe 9a includes three link, its respectively with first detection mouth 6a of first wind pressure switch 6, the first detection mouth 7a of second wind pressure switch 7 and the first pressure port 8a of getting pressure device 8 links to each other, second connecting pipe 9b also includes three link, its respectively with the second of first wind pressure switch 6 detects mouth 6b, the second of second wind pressure switch 7 detects mouth 7b and the second of getting pressure device 8 gets pressure port 8a and links to each other, thereby realizes get pressure device 8 with first wind pressure switch 6 with the fluid intercommunication of second wind pressure switch 7. In other words, the first wind pressure switch 6 and the second wind pressure switch 7 share one pressure taking device 8. Wherein the start-up pressure difference and the shutdown pressure difference of the first wind pressure switch 6 are set according to a first operating speed V1 of the fan, and the start-up pressure difference and the shutdown pressure difference of the second wind pressure switch 7 are set according to a second operating speed V2 of the fan, which is less than the first operating speed V1. The first operating speed V1 and the second operating speed V2 may represent two different speed values, or may represent two different speed ranges.
When the fan of the gas wall-hanging stove is set to operate at the first operating speed V1, the gas wall-hanging stove is turned on/off by the on/off of the first wind pressure switch 6 corresponding to the first operating speed V1. Likewise, when the fan of the gas wall-hanging stove is set to operate at the second operating speed V2 which is small (for example, when the heating demand is reduced and the power of the gas wall-hanging stove is correspondingly reduced), the gas wall-hanging stove will be turned on/off by the on/off of the second wind pressure switch 7 corresponding to the second operating speed V2. That is, the first wind pressure switch 6 and the second wind pressure switch 7 function independently at different operating speeds V1, V2 of the fan to ensure the safety of the gas wall-hanging stove.
A control method 100 for a gas wall-hanging stove including the above-described wind pressure switch assembly is described below with reference to fig. 6.
The control method 100 begins at step 101 where a user inputs a command to start a gas wall-hanging stove. For example, a user may enter a command to start a gas wall-hanging stove by pressing a button or touching a display screen.
The method then proceeds to step 103 where the control unit 10 turns the fan on and runs it at turn-on speed, while beginning to monitor the status of both the first and second wind pressure switches 6, 7.
Subsequently, in step 105, the control unit 10 monitors whether the first wind pressure switch 6 and the second wind pressure switch 7 are closed within T1 seconds, and the step is effective to check whether the fan and wind pressure switch assembly can operate normally. If the control unit 10 detects that the first wind pressure switch 6 and the second wind pressure switch 7 are both closed within T1 seconds, it indicates that both the fan and the wind pressure switch assembly of the gas wall hanging stove can work normally, and therefore, the method will proceed to step 107, which will be described in detail below. However, if the control unit 10 detects that the first wind pressure switch 6 and/or the second wind pressure switch is not closed within T1 seconds, it indicates that the fan of the gas wall-hanging stove or the first wind pressure switch and/or the second wind pressure switch is malfunctioning, at which point the method will proceed to step 108, where the control unit 10 controls an alarm connected thereto to give an alarm and stops the gas wall-hanging stove.
In step 107, the control unit 10 will control the fan to operate continuously, open the safety valve, bring the gas wall hanging stove into a combustion state, and continuously monitor the states of the first wind pressure switch 6 and the second wind pressure switch 7.
Subsequently, the control unit 10 may set the fan to operate at a speed V1 or V2, depending on the actual use requirements.
When the control unit 10 sets the fan to operate at speed V1, it can monitor only the state of the first wind pressure switch 6. Specifically, the control unit 10 monitors whether the first wind pressure switch 6 is changed from the closed state to the open state, as shown in step 109 in fig. 6. If the control unit 10 detects that the first wind pressure switch 6 is turned off, it indicates that a malfunction such as a blockage of the exhaust passage occurs, and then the method proceeds to step 113, which will be described in detail below. If the control unit 10 monitors that the first wind pressure switch 6 is kept in the closed state, it indicates that the gas wall-hanging stove is operating normally, and the control unit 10 only needs to make the gas wall-hanging stove operate continuously in the state (step 115) until the control unit 10 receives a command of closing the gas wall-hanging stove input by a user (step 117).
Likewise, when the control unit 10 sets the fan to operate at a speed V2, it may monitor only the state of the second wind pressure switch 7. Specifically, the control unit 10 monitors whether the second wind pressure switch 7 is changed from the closed state to the open state, as shown in step 111 in fig. 6. If the control unit 10 detects that the second wind pressure switch 7 is turned off, it indicates that a malfunction such as a blockage of the exhaust passage occurs, and then the method proceeds to step 113. If the control unit 10 monitors that the second wind pressure switch 7 is kept in the closed state, it indicates that the gas wall-hanging stove is operating normally, and the control unit 10 only needs to make the gas wall-hanging stove operate continuously in this state (step 115) until the control unit 10 receives a command of closing the gas wall-hanging stove input by a user (step 117).
At step 113, the control unit 10 monitors whether the first wind pressure switch 6 or the second wind pressure switch 7 after the opening is re-closed within T2 seconds, which is aimed at determining whether the failure to open the first wind pressure switch 6 or the second wind pressure switch 7 is a transient failure. If the first wind pressure switch 6 or the second wind pressure switch 7 is not re-closed within T2 seconds, it is indicated that the fault is not temporary, so the method proceeds to step 108 where the control unit 10 controls an alarm connected thereto to give an alarm and stops the gas wall-hanging stove. If the first wind pressure switch 6 or the second wind pressure switch 7 is re-closed within T2 seconds, indicating that the fault is temporary, the method proceeds to step 115, where the control unit 10 controls the gas wall-hanging stove to continuously operate in the current state, so as to avoid frequent alarms and/or shutdowns of the gas wall-hanging stove due to the transient fault thereof.
In addition, the method may further include the step of the control unit 10 converting the speed of the blower from V1 to V2 or from V2 to V1, according to actual use requirements of the gas wall-hanging stove.
Since the first operating speed V1 is greater than the second operating speed V2, the power-on pressure difference of the first wind pressure switch 6 is greater than the power-on pressure difference of the second wind pressure switch 7, and the power-off pressure difference of the first wind pressure switch is greater than the power-off pressure difference of the second wind pressure switch.
Preferably, the connection pipe 9 is hermetically connected with the first wind pressure switch 6, the second wind pressure switch 7 and the pressure tapping device 8 to ensure the air tightness of the wind pressure switch assembly, thereby improving the detection accuracy of the wind pressure switch assembly.
Preferably, the first detection port 6a,7a and the second detection port 6b,7b of each of the first wind pressure switch 6 and the second wind pressure switch 7 are disposed to face downward to prevent foreign matter from entering into the first wind pressure switch 6 and the second wind pressure switch 7 via the connection pipe 9 to affect the normal use of the first wind pressure switch 6 and the second wind pressure switch 7.
Preferably, the connecting pipe 9 is a hose, so that the installation position of the wind pressure switches 6 and 7 in the shell of the gas wall-hanging stove can be flexibly selected according to requirements. Further, the connection tube 9 may be made of silicon rubber.
In other embodiments according to the present invention, the plurality of wind pressure switch assemblies may include three or more wind pressure switches for a gas wall-hanging stove having three or more operating speeds of a fan.
The invention also discloses a gas wall-mounted furnace comprising the wind pressure switch assembly, wherein the wind pressure switches and the pressure taking device are respectively and fixedly arranged in a shell and an exhaust channel of the gas wall-mounted furnace.
Preferably, the casing of gas hanging stove includes the wind pressure switch mount pad, a plurality of wind pressure switches pass through snap-fit and install on the wind pressure switch mount pad. Thereby, the installation process of the plurality of wind pressure switches can be simplified.
It should be noted that the terms "first", "second", and the like in the description and in the claims of the present invention are used for distinguishing similar objects, and are not used for describing a particular order or sequence. It is to be understood that objects referred to as "first" or "second", etc., are interchangeable under appropriate circumstances.
Although specific embodiments of the present invention have been disclosed, those skilled in the art will appreciate that various modifications, substitutions and alterations can be made without departing from the spirit and scope of the invention. Accordingly, the scope of the invention is not to be limited by the specific embodiments described above, but only by the appended claims.
Claims (14)
1. A wind pressure switch assembly for a gas wall hanging stove including a fan having a plurality of operating speeds, the wind pressure switch assembly comprising:
a plurality of wind pressure switches (6,7), each of the plurality of wind pressure switches (6,7) including a first detection port (6a,7a) and a second detection port (6b,7 b);
a pressure taking device (8), the pressure taking device (8) comprising a first pressure taking port (8a) and a second pressure taking port (8 b); and
a connection pipe (9), the connection pipe (9) including a first connection pipe (9a) and a second connection pipe (9b), a first detection port (6a,7a) of each of the plurality of wind pressure switches (6,7) being communicated with a first pressure taking port (8a) of the pressure taking device (8) via the first connection pipe (9a), and a second detection port (6b,7b) of each of the plurality of wind pressure switches (6,7) being communicated with a second pressure taking port (8b) of the pressure taking device (8) via the second connection pipe (9b),
wherein each of the plurality of wind pressure switches (6,7) corresponds to each of a plurality of operating speeds of the fan, respectively, and a power-on pressure difference/power-off pressure difference of each of the plurality of wind pressure switches (6,7) is set according to a corresponding one of the plurality of operating speeds of the fan, respectively.
2. The wind pressure switch assembly according to claim 1, wherein the first pressure taking port (8a) and the second pressure taking port (8b) of the pressure taking device (8) are negative pressure taking ports.
3. The wind pressure switch assembly according to claim 2, wherein the pressure taking device (8) is formed of two venturi tubes having different sizes, and the first pressure taking port (8a) and the second pressure taking port (8b) are provided at throats of the two venturi tubes, respectively.
4. The wind pressure switch assembly according to claim 1, wherein the first and second pressure ports (8a, 8b) of the pressure taking device (8) are positive and negative pressure ports, respectively.
5. The wind pressure switch assembly according to claim 1, wherein the plurality of wind pressure switches (6,7) includes a first wind pressure switch (6) and a second wind pressure switch (7) corresponding to a first operating speed V1 and a second operating speed V2 of the fan, respectively, the first connection pipe (9a) includes three connection ends, which are respectively connected with a first detection port (6a) of the first wind pressure switch (6), a first detection port (7a) of the second wind pressure switch (7) and a first pressure taking port (8a) of the pressure taking device (8), the second connecting pipe (9b) also comprises three connecting ends, 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 (8a) of the pressure taking device (8) are respectively connected.
6. The wind pressure switch assembly according to claim 5, wherein when the fan is set to operate at the first operating speed V1, the gas wall hanging stove is turned on/off by closing/opening the first wind pressure switch (6); and when the fan is set to operate at the second operating speed V2, the gas wall hanging stove is turned on/off by the closing/opening of the second wind pressure switch (7).
7. The wind pressure switch assembly according to claim 6, wherein the first operating speed V1 of the fan is greater than the second operating speed V2, and the start pressure difference of the first wind pressure switch (6) is greater than the start pressure difference of the second wind pressure switch (7), and the shutdown pressure difference of the first wind pressure switch (6) is less than the shutdown pressure difference of the second wind pressure switch (7).
8. The wind pressure switch assembly according to claim 5, wherein the first and second detection ports (6a,7a, 6b,7b) of each of the first and second wind pressure switches (6,7) are disposed to face downward.
9. A gas wall hanging stove comprising a wind pressure switch assembly as claimed in any one of claims 1 to 8 and a fan having multiple operating speeds, wherein the plurality of wind pressure switches (6,7) and the pressure taking device (8) are fixedly mounted in the housing and the exhaust passage of the gas wall hanging stove, respectively.
10. A control method for a gas wall-hanging stove according to claim 9, further comprising a control unit (10) electrically connected to a plurality of wind pressure switches (6,7) of the wind pressure switch assembly, characterized by comprising the steps of:
after receiving a command to start the gas wall-hanging stove, the control unit (10) turns on the fan and monitors a state of each of the plurality of wind pressure switches (6, 7);
when each of the plurality of wind pressure switches (6,7) is monitored to be closed within T1 seconds, the control unit (10) controls the gas wall-hanging stove to enter a combustion state;
during the combustion process of the gas wall-hanging stove, the control unit (10) sets the operating speed of the fan to a first operating speed V1 according to the use requirement, and monitors the state of a first wind pressure switch (6) corresponding to the first operating speed V1 in the plurality of wind pressure switches (6, 7); and
when the first wind pressure switch (6) is monitored to be in a closed state, the control unit (10) controls the gas wall-hanging stove to continuously operate in a current state; when the first wind pressure switch (6) is monitored to be disconnected, the control unit (10) controls an alarm to give an alarm, and the gas wall-hanging stove is stopped.
11. The control method for a gas wall-hanging stove according to claim 10, characterized in that when the control unit (10) detects that any one of the plurality of wind pressure switches (6,7) is not closed within T1 seconds, the control unit (10) controls an alarm to give an alarm.
12. The control method for the gas wall-hanging stove according to claim 10 or 11, characterized by further comprising the steps of: after monitoring that the first wind pressure switch (6) is turned off, the control unit (10) further monitors whether the turned-off first wind pressure switch (6) is re-closed within T2 seconds, and if so, the control unit (10) controls the gas wall hanging stove to continuously operate in the current state until receiving a command to turn off the gas wall hanging stove.
13. The control method for a gas wall-hanging stove according to claim 10 or 11, characterized in that the method further comprises the steps of: during the combustion process of the gas wall-hanging stove, the control unit (10) changes the operating speed of the fan from a first operating speed V1 to a second operating speed V2 according to the use requirement and monitors the state of a second wind pressure switch (7) corresponding to the second operating speed V2 in the plurality of wind pressure switches (6, 7).
14. The control method for gas wall hanging furnaces according to claim 13, characterized in that the first operating speed V1 and/or the second operating speed V2 of the fan represent a single speed value or speed range.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010673947.4A CN113932452A (en) | 2020-07-14 | 2020-07-14 | Wind pressure switch assembly, gas wall-mounted furnace comprising wind pressure switch assembly and control method of gas wall-mounted furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010673947.4A CN113932452A (en) | 2020-07-14 | 2020-07-14 | Wind pressure switch assembly, gas wall-mounted furnace comprising wind pressure switch assembly and control method of gas wall-mounted furnace |
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| Publication Number | Publication Date |
|---|---|
| CN113932452A true CN113932452A (en) | 2022-01-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010673947.4A Pending CN113932452A (en) | 2020-07-14 | 2020-07-14 | Wind pressure switch assembly, gas wall-mounted furnace comprising wind pressure switch assembly and control method of gas wall-mounted furnace |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114992666A (en) * | 2022-03-31 | 2022-09-02 | 重庆海尔热水器有限公司 | Device for reducing generation of wind pressure switch condensate water, gas heating equipment and control method thereof |
-
2020
- 2020-07-14 CN CN202010673947.4A patent/CN113932452A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114992666A (en) * | 2022-03-31 | 2022-09-02 | 重庆海尔热水器有限公司 | Device for reducing generation of wind pressure switch condensate water, gas heating equipment and control method thereof |
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