Heating stove

Abstract

The utility model belongs to the technical field of combustion devices, and particularly discloses a heating stove. The heating stove comprises a combustor, a mixing channel, an air channel, a fuel gas channel and a controller. An outlet of the mixing passage is communicated with the combustor; an outlet of the air passage is communicated with an inlet of the mixing passage; an outlet of the fuel gas passage is communicated with an inlet of the mixing passage, the fuel gas passage comprises a fuel gas valve and an adjusting nozzle which are sequentially connected in the fuel gas flowing direction, a fuel gas pressure monitoring part is arranged on the fuel gas passage and located between the adjusting nozzle and the mixing passage, and the fuel gas pressure monitoring part is used for monitoring a first fuel gas pressure value of fuel gas flowing into the mixing passage; the fuel gas pressure monitoring piece is electrically connected with the controller and can send a monitored first fuel gas pressure value to the controller, and the controller is configured to control the heating stove to stop when the first fuel gas pressure value exceeds a safety threshold value. The situation that the heating stove still works when the pressure value of the first gas entering the mixing channel is abnormal can be avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of combustion devices, in particular to a heating furnace. Background Art

[0002] The ratio of the mass of air to the mass of fuel gas in the combustible mixture is the air-fuel ratio. A constant air-fuel ratio can ensure the stability of combustion.

[0003] In a fully premixed heating furnace, gas and air are completely mixed in the premixer. In order to ensure that the air-fuel ratio of the heating furnace remains constant, the airflow pressure ratio of the gas passage and the air passage of the heating furnace is generally controlled to remain constant. Generally speaking, the air pressure value of the air passage of the heating furnace is less than the atmospheric pressure value, so the air pressure of the air passage is negative pressure; accordingly, the gas pressure of the gas passage should also be negative pressure, and the gas pressure when flowing into the premixer should also be negative pressure, so as to ensure the safe use of the heating furnace.

[0004] When using a heating furnace, users may adjust the fan speed of the heating furnace according to actual usage, thereby adjusting the combustion load. However, when the fan speed changes, the pressure of the air passage will change accordingly; in order to ensure a constant air-fuel ratio, the heating furnace will adaptively adjust the gas valve opening according to the fan speed to adjust the gas flow entering the premixer; or when the gas source composition changes, the air-fuel ratio is adjusted by adjusting the nozzle opening to ensure sufficient combustion.

[0005] However, during the process of adjusting the gas valve or nozzle opening, if the gas valve or nozzle fails, the gas pressure in the gas path will increase beyond the set value or even become positive pressure, which will cause the air-fuel ratio to be out of balance and the gas to burn incompletely. At this time, if the heating furnace continues to work, the concentration of flue gas pollutants discharged by the heating furnace will be too high, which will affect the service life of the product and even affect the safety performance of the product. Utility Model Content

[0006] The technical problem solved by the utility model is to provide a heating furnace, which can effectively solve the technical problems existing in the prior art such as gas valve or regulating nozzle failure, which causes abnormal gas pressure in the gas passage, imbalance of air-fuel ratio, and excessively high concentration of flue gas pollutants discharged by the heating furnace, affecting the service life of the product and even affecting the safety performance of the product.

[0007] The above technical problems are solved by the following technical solutions:

[0008] Heating furnace, including:

[0009] Burner;

[0010] a mixing passage, an outlet of the mixing passage being in communication with the burner;

[0011] an air passage, an outlet of the air passage being in communication with an inlet of the mixing passage;

[0012] a gas passage, wherein the outlet of the gas passage is communicated with the inlet of the mixing passage, the gas passage is provided with a gas valve and an adjusting nozzle sequentially connected along the gas flow direction, a gas pressure monitoring component is provided on the gas passage between the adjusting nozzle and the mixing passage, and the gas pressure monitoring component is used to monitor a first gas pressure value of the gas flowing into the mixing passage;

[0013] The gas pressure monitoring device is electrically connected to the controller and can send the first gas pressure value monitored to the controller. The controller is configured to control the heating furnace to shut down when the first gas pressure value exceeds a safety threshold.

[0014] Compared with the background technology, the heating furnace described in the utility model has the following beneficial effects:

[0015] The gas pressure monitoring device is arranged downstream of the regulating nozzle and between the regulating nozzle and the mixing passage, so as to fully ensure that the data obtained by the gas pressure monitoring device is the first gas pressure value of the gas flowing into the mixing passage, thereby ensuring the accuracy of the monitoring result.

[0016] During the process of the opening of the gas valve or the regulating nozzle changing, if the gas pressure monitoring device detects that the first gas pressure value exceeds the safety threshold, it means that the gas valve or the regulating nozzle has failed, the air-fuel ratio is out of balance, and the controller controls the heating furnace to shut down; prevent the heating furnace from continuing to work when the air-fuel ratio is out of balance, and avoid adverse effects on the product's service life and safety performance.

[0017] In one of the embodiments, the mixing passage is provided with a premixer and a fan which are sequentially connected to each other along the fluid flow direction, the outlet of the gas passage is connected to the inlet of the premixer, the outlet of the air passage is connected to the inlet of the premixer, and the air outlet of the fan is connected to the burner; the gas pressure monitoring device is arranged between the regulating nozzle and the premixer.

[0018] In one embodiment, the heating furnace also includes a pressure difference detection component, and the pressure difference detection component includes a pressure difference detection part. The pressure difference detection part can obtain the difference between the second gas pressure value of the gas sprayed from the gas valve and the air pressure value at the outlet of the air passage. The pressure difference detection part is electrically connected to the controller, and the controller can control the opening of the gas valve according to the difference.

[0019] In one embodiment, the pressure difference detection component further includes:

[0020] a first pressure-taking pipe and a first pressure-taking joint, wherein the first pressure-taking joint is arranged on the gas pipeline between the gas valve and the regulating nozzle, one end of the first pressure-taking pipe is connected to the pressure difference detection element, and the other end is connected to the first pressure-taking joint;

[0021] A second pressure-taking tube and a second pressure-taking joint, wherein the second pressure-taking joint is arranged at the outlet of the air passage, one end of the second pressure-taking tube is connected to the pressure difference detection component, and the other end is connected to the second pressure-taking joint.

[0022] In one embodiment, the first pressure-taking tube is made of silicone; and / or

[0023] The second pressure-taking tube is made of silicone.

[0024] In one embodiment, the pressure difference detection element is a wind pressure sensor.

[0025] In one of the embodiments, the fan is electrically connected to the controller, and the controller is capable of adjusting the rotation speed of the fan.

[0026] In one embodiment, the air passage comprises an air filter, and an outlet end of the air filter is communicated with an inlet end of the mixing passage.

[0027] In one of the embodiments, the gas pressure monitoring component is a gas pressure switch or a pressure sensor.

[0028] In one of the embodiments, the heating furnace further includes a display, and the display is electrically connected to the controller. When the controller controls the heating furnace to shut down, the display can display a fault prompt. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic diagram of the structure of a heating furnace provided in an embodiment of the utility model;

[0030] Figure 2 for Figure 1 Enlarged view of point A in the middle.

[0031] Description of labels:

[0032] 1. Burner; 11. Ignition needle; 12. Flame feedback needle;

[0033] 2. Mixing passage; 21. Premixer; 22. Fan;

[0034] 3. Air passage; 31. Air filter;

[0035] 4. Gas passage; 41. Gas valve; 42. Adjusting nozzle; 43. Gas pressure monitoring component;

[0036] 5. Controller;

[0037] 6. differential pressure detection assembly; 61. differential pressure detection member; 62. first pressure-taking tube; 63. first pressure-taking joint; 64. second pressure-taking tube; 65. second pressure-taking joint;

[0038] 7. Display. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0040] In the description of the present application, it should be understood that the terms "upper", "lower", "inner", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application 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 understood as a limitation on the present application.

[0041] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0042] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0043] See also Figure 1 and Figure 2 , this embodiment provides a heating furnace with good safety performance.

[0044] Specifically, the heating furnace is a full premix heating furnace.

[0045] The heating furnace includes a burner 1, a mixing passage 2, an air passage 3, a gas passage 4 and a controller 5.

[0046] An outlet of the mixing passage 2 communicates with the burner 1 .

[0047] The outlet of the air passage 3 communicates with the inlet of the mixing passage 2 .

[0048] The outlet of the gas passage 4 is connected to the inlet of the mixing passage 2. The gas passage 4 is provided with a gas valve 41 and an adjusting nozzle 42 which are connected in sequence along the gas flow direction. A gas pressure monitoring component 43 is provided on the gas passage 4 between the adjusting nozzle 42 and the mixing passage 2. The gas pressure monitoring component 43 is used to monitor the first gas pressure value of the gas flowing into the mixing passage 2.

[0049] The gas pressure monitoring element 43 is electrically connected to the controller 5 and can send the monitored first gas pressure value to the controller 5. The controller 5 is configured to control the heating furnace to shut down when the first gas pressure value exceeds a safety threshold.

[0050] When the heating furnace provided in this embodiment is working, the air passage 3 supplies air to the mixing passage 2, and the gas passage 4 supplies gas to the mixing passage 2. The air and gas are mixed in the mixing passage 2 to form a mixed gas, which flows into the burner 1 and participates in combustion.

[0051] The gas valve 41 and the regulating nozzle 42 are arranged in sequence along the gas flow direction. A gas pressure monitoring component 43 is arranged between the regulating nozzle 42 and the inlet end of the mixing passage 2 on the gas passage 4. By arranging the gas pressure monitoring component 43 between the regulating nozzle 42 and the inlet end of the mixing passage 2 on the gas passage 4, the first gas pressure value of the gas flowing into the mixing passage 2 can be obtained. That is, the first gas pressure value is the first gas pressure value input from the gas passage 4 to the mixing passage 2. The first gas pressure value is monitored. If the first gas pressure value exceeds the safety threshold, the heating furnace is shut down to ensure the safety performance of the heating furnace.

[0052] The gas pressure monitoring component 43 is arranged downstream of the regulating nozzle 42 , and the gas pressure monitoring component 43 is located between the regulating nozzle 42 and the mixing passage 2 , so as to fully ensure that the data obtained by the gas pressure monitoring component 43 is the first gas pressure value of the gas flowing into the mixing passage 2 .

[0053] During the process of the opening of the gas valve 41 or the regulating nozzle 42 changing, if the gas pressure monitoring component 43 detects that the first gas pressure value exceeds the safety threshold, it means that the gas valve 41 fails and the air-fuel ratio is out of balance, and the controller 5 controls the heating furnace to shut down, so as to prevent the heating furnace from continuing to work when the air-fuel ratio is out of balance, and to avoid adverse effects on the service life and safety performance of the product.

[0054] It should be noted that the gas valve 41 is used to adjust the gas flow rate according to the change of the fan speed to maintain a constant air-fuel ratio; the regulating nozzle 42 is used to adjust the air-fuel ratio according to the optimal air-fuel ratio adapted to different gas types.

[0055] In one embodiment, the gas pressure monitoring component 43 is a gas pressure switch or a pressure sensor.

[0056] Preferably, the gas pressure monitoring component 43 is a gas pressure switch.

[0057] The gas pressure switch has an adjustment knob for adjusting the safety threshold value set therein. The structure of the gas pressure switch belongs to the prior art. The structure of the gas pressure switch is briefly introduced below: a diaphragm is provided inside the gas pressure switch, and the diaphragm will be displaced as the pressure changes. There is a normally closed metal contact on the diaphragm and it is connected to the controller 5 through a signal line. There is also a normally open metal contact connected to the controller 5 through a signal line. When in use, the gas pressure switch is in a normally closed state. When the first gas pressure value increases, the diaphragm is displaced and moves in the direction of the normally open contact. When the first gas pressure value exceeds the set safety threshold, the diaphragm contacts with the normally open contact, and the gas pressure switch is actuated while transmitting the signal to the controller 5, and the controller 5 controls the heating furnace to shut down.

[0058] Furthermore, when the first gas pressure value exceeds the safety threshold, the controller 5 controls the gas valve 41 to close, cuts off the gas supply, and thus controls the heating furnace to shut down.

[0059] Optionally, the model of the gas pressure switch is GW10A5.

[0060] In one embodiment, a premixer 21 and a fan 22 are provided on the mixing passage 2, which are sequentially connected to each other along the fluid flow direction, the outlet of the gas passage 4 is connected to the premixer 21, and the outlet of the air passage 3 is connected to the premixer 21. After entering the premixer 21, the gas and air are premixed to form a mixed gas.

[0061] The air outlet of the fan 22 is connected to the burner 1, and the gas pressure monitoring component 43 is arranged between the regulating nozzle 42 and the premixer 21. The fan 22 is used to blow the mixed gas into the burner 1.

[0062] That is, the gas pressure monitoring component 43 can obtain the pressure of the gas before it enters the premixer 21 .

[0063] Specifically, the structure of the premixer 21 belongs to the prior art and will not be described in detail here.

[0064] In one of the embodiments, in order to fully ensure the stability of the air-fuel ratio of the heating furnace, the heating furnace also includes a pressure difference detection component 6, the pressure difference detection component 6 includes a pressure difference detection element 61, the pressure difference detection element 61 can obtain the difference between the second gas pressure value of the gas sprayed from the gas valve 41 and the air pressure value at the outlet end of the air passage 3, the pressure difference detection element 61 is electrically connected to the controller 5, and the controller 5 can control the opening of the gas valve 41 according to the difference.

[0065] Specifically, according to the Bernoulli equation, the air flow rate V flowing through the premixer 21 is a for:

[0066]

[0067] Where: V a —Air flow rate, in m 3 / h;

[0068] α—premixer flow coefficient;

[0069] A a —Premixer flow area, in m 2 ;

[0070] P a1 —Premixer front end static pressure, in Pa;

[0071] P a2 —Premixer throat static pressure, in Pa;

[0072] ρ a —Air density, in kg / m 3 ;

[0073] K a —Premixer resistance coefficient.

[0074] Gas flow rate V flowing through the premixer g for:

[0075]

[0076] in:

[0077] V g —Gas flow rate, in m 3 / h;

[0078] β—gas nozzle flow coefficient;

[0079] A g —Gas nozzle area, in m 2 ;

[0080] P g —Static pressure before the gas nozzle, in Pa;

[0081] P a2 —Premixer throat static pressure, in Pa;

[0082] ρ g —Gas density, in kg / m 3 ;

[0083] K g —Nozzle coefficient.

[0084] Air flow V a and gas flow V g The ratio is the air-fuel ratio, which is:

[0085]

[0086] In order to make the gas burn more completely, the air-fuel ratio must be kept constant.

[0087] When P g =P a1 hour, The air-fuel ratio is constant.

[0088] Therefore, in order to ensure a constant air-fuel ratio of the heating furnace, it is only necessary to ensure that P is maintained during the load adjustment process. g =P a1 That's it.

[0089] Therefore, the pressure difference detection element 61 obtains the second gas pressure value (i.e., the static pressure P before the gas nozzle) ejected by the gas valve 41. g ) and the air pressure value at the outlet of the air passage 3 (i.e. the static pressure P at the front end of the premixer) a1 The controller 5 controls the difference between the second fuel gas pressure value and the air pressure value to be zero, so as to achieve a constant air-fuel ratio.

[0090] See also Figure 2 In one embodiment, the pressure difference detection assembly 6 also includes a first pressure taking tube 62 , a first pressure taking connector 63 , a second pressure taking tube 64 and a second pressure taking connector 65 .

[0091] The first pressure-taking joint 63 is arranged on the gas pipeline between the gas valve 41 and the regulating nozzle 42. One end of the first pressure-taking pipe 62 is connected to the pressure difference detection element 61, and the other end is connected to the first pressure-taking joint 63. The pressure difference detection element 61, the first pressure-taking pipe 62 and the first pressure-taking joint 63 cooperate to obtain the second gas pressure value (i.e., the static pressure P before the gas nozzle). g ).

[0092] The second pressure-taking connector 65 is disposed at the outlet of the air passage 3 (the outlet of the air passage 3 is the front end of the premixer), one end of the second pressure-taking tube 64 is connected to the pressure differential detection element 61, and the other end is connected to the second pressure-taking connector 65. The pressure differential detection element 61, the second pressure-taking tube 64 and the second pressure-taking connector 65 cooperate to obtain the air pressure value (i.e., the static pressure P at the front end of the premixer). a1 ).

[0093] The pressure difference detection element 61 is electrically connected to the controller 5, and the controller 5 can control the opening of the gas valve 41 according to the difference. Such an arrangement facilitates the control of the air-fuel ratio, ensures a constant air-fuel ratio, and further ensures sufficient combustion of the heating furnace.

[0094] Specifically, the controller 5 adjusts the air pressure value (i.e., the static pressure P at the front end of the premixer) according to the air pressure value. a1 ) in real time to adjust the opening of the gas valve 41, and then adjust the second gas pressure value (i.e., the static pressure P before the gas nozzle) in real time. g ) so that the two are equal, thus achieving a constant air-fuel ratio.

[0095] Since the air pressure value (i.e. the static pressure P at the front end of the premixer) a1 ) is negative pressure; According to the Bernoulli equation, the second gas pressure value (i.e., the static pressure before the gas nozzle P g ) should also be negative pressure.

[0096] Theoretically, it is necessary to monitor the second gas pressure value (i.e. the static pressure P before the gas nozzle). g ) becomes larger or is a positive pressure; however, since a regulating nozzle 42 is provided downstream of the gas valve 41, it can be known that in order to ensure the normal operation of the heating furnace, the gas pressure value downstream of the regulating nozzle 42 (i.e., the first gas pressure value) should also be a negative pressure. In this embodiment, a gas pressure monitoring component 43 is provided downstream of the regulating nozzle 42 to monitor the first gas pressure value of the gas flowing into the premixer 21, so as to prevent the heating furnace from continuing to work after the air-fuel ratio is out of adjustment, and fully ensure the normal operation of the heating furnace.

[0097] In one embodiment, the first pressure-taking tube 62 is made of silicone; and / or

[0098] The second pressure-taking tube 64 is made of silicone.

[0099] Preferably, the first pressure-taking tube 62 and the second pressure-taking tube 64 are made of silicone. With the increase of service life, even if the tube is damaged, the negative pressure in the tube will not cause gas leakage.

[0100] In one embodiment, the pressure difference detection element 61 is a pressure difference sensor.

[0101] The wind pressure sensor is a sensor used to measure the difference between two pressures. Its working principle is that the measured pressure directly acts on the diaphragm of the wind pressure sensor, causing the diaphragm to produce a micro-displacement proportional to the pressure change, causing the capacitance value of the wind pressure sensor to change, and converting and outputting a standard measurement signal corresponding to the pressure.

[0102] Optionally, the model of the pressure difference detection element 61 is SW-M3-A.

[0103] In one embodiment, the air passage 3 comprises an air filter 31 , and an outlet end of the air filter 31 is communicated with an inlet end of the mixing passage 2 .

[0104] The air filter 31 can filter the air to prevent impurities in the air from entering the mixing passage 2 and affecting the normal combustion of the burner 1 .

[0105] In one embodiment, the heating furnace further includes a display 7, which is electrically connected to the controller 5. When the controller 5 controls the heating furnace to shut down, the display 7 can display a fault prompt. Optionally, when the controller 5 controls the heating furnace to shut down, the display 7 displays a fault code, and the user can quickly determine the cause of the fault through the fault code.

[0106] In one embodiment, the fan 22 is electrically connected to the controller 5, and the controller 5 can adjust the speed of the fan 22. This arrangement facilitates the user to adjust different combustion loads according to actual usage conditions, that is, to adjust the speed of the fan 22.

[0107] Exemplarily, in this embodiment, the working process of the heating furnace is as follows:

[0108] When the controller 5 detects that the user has a need to use the heating furnace, the fan 22 starts and performs pre-cleaning at a pre-cleaning speed for a certain period of time, and the heating furnace performs a pre-inspection of the whole machine;

[0109] Then, the fan 22 runs at the operating speed, and the air flows into the premixer 21 through the air filter 31;

[0110] The controller 5 releases an electrical signal to discharge the ignition needle 11 of the burner 1, and the gas flows to the gas valve 41 through the gas pipe, and then flows through the regulating nozzle 42 to the premixer 21; the gas and air are mixed in the premixer 21 to form a mixed gas, which is sent to the burner 1 and ignited by the high voltage electricity released by the ignition needle;

[0111] When the flame feedback needle 12 of the burner detects the flame signal, it indicates that the combustion of the burner 1 has entered a stable state. When the value of the air-fuel ratio needs to be changed, the regulating nozzle 42 can be adjusted.

[0112] When the user needs to adjust the combustion load according to actual usage, the user only needs to adjust the rotation speed of the fan 22.

[0113] Specifically, the speed of the fan 22 increases when the load is high. a1 |The value of |P g -P a1 | becomes larger, so that the pressure difference between the second gas pressure value sprayed by the gas valve 41 and the air pressure value at the outlet end of the air passage 3 is not zero. At this time, the controller 5 will release an electrical signal to the gas valve 41 according to the pressure difference, adjust the opening of the gas valve 41, and increase the second gas pressure value sprayed by the gas valve 41 (that is, the static pressure P before the gas nozzle). g ), so that the pressure difference gradually decreases to zero, and finally Pg =P a1 , thereby maintaining a stable air-fuel ratio.

[0114] At low load, the speed of the fan 22 decreases, |P a1 The value of | becomes smaller, |P g -P a1 | becomes larger, so that the pressure difference between the second gas pressure value sprayed by the gas valve 41 and the air pressure value at the outlet end of the air passage 3 is not zero. At this time, the controller 5 will release an electrical signal to the gas valve 41 according to the pressure difference, adjust the opening of the gas valve 41, and reduce the second gas pressure value sprayed by the gas valve 41 (that is, the static pressure P before the gas nozzle). g ), so that the pressure difference gradually decreases to zero, and finally P g =P a1 , thereby maintaining a stable air-fuel ratio.

[0115] When the user adjusts the combustion load according to the actual usage, the gas pressure monitoring component 43 monitors the gas pressure flowing into the premixer 21 in real time to ensure that the pressure value before the gas flows into the premixer 21 is always negative pressure and within the safety range. If the gas pressure monitoring component 43 detects that the gas pressure flowing into the premixer 21 is abnormal, the controller 5 controls the heating furnace to shut down, so as to prevent the heating furnace from continuing to work when the air-fuel ratio is out of balance, and to avoid adverse effects on the service life and safety performance of the product.

[0116] In the specific contents of the above-mentioned specific implementation methods, the various technical features can be combined in any non-contradictory manner. In order to make the description concise, not all possible combinations of the above-mentioned technical features are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0117] The specific contents of the above specific implementations only express several implementations of the utility model, and the descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A heating furnace, characterized in that: include: Burner (1); A mixing passage (2), wherein an outlet of the mixing passage (2) is in communication with the burner (1); an air passage (3), the outlet of the air passage (3) being in communication with the inlet of the mixing passage (2); a gas passage (4), wherein the outlet of the gas passage (4) is in communication with the inlet of the mixing passage (2); a gas valve (41) and an adjusting nozzle (42) are provided on the gas passage (4) and are connected in sequence along the gas flow direction; a gas pressure monitoring component (43) is provided on the gas passage (4) between the adjusting nozzle (42) and the mixing passage (2); the gas pressure monitoring component (43) is used to monitor a first gas pressure value of the gas flowing into the mixing passage (2); The gas pressure monitoring device (43) is electrically connected to the controller (5) and is capable of sending the first gas pressure value monitored to the controller (5), and the controller (5) is configured to control the heating furnace to shut down when the first gas pressure value exceeds a safety threshold.

2. The heating furnace according to claim 1, characterized in that: The mixing passage (2) is provided with a premixer (21) and a fan (22) which are sequentially connected to each other along the flow direction of the fluid; the outlet of the gas passage (4) is connected to the inlet of the premixer (21); the outlet of the air passage (3) is connected to the inlet of the premixer (21); the air outlet of the fan (22) is connected to the burner (1); and the gas pressure monitoring component (43) is provided between the regulating nozzle (42) and the premixer (21).

3. The heating furnace according to claim 2, characterized in that: The heating furnace also includes a pressure difference detection component (6), and the pressure difference detection component (6) includes a pressure difference detection element (61). The pressure difference detection element (61) can obtain the difference between the second gas pressure value of the gas sprayed from the gas valve (41) and the air pressure value at the outlet of the air passage (3). The pressure difference detection element (61) is electrically connected to the controller (5), and the controller (5) can control the opening of the gas valve (41) according to the difference.

4. The heating furnace according to claim 3, characterized in that: The pressure difference detection component (6) further comprises: a first pressure-taking pipe (62) and a first pressure-taking joint (63), wherein the first pressure-taking joint (63) is arranged on the gas pipeline between the gas valve (41) and the regulating nozzle (42), one end of the first pressure-taking pipe (62) is connected to the pressure difference detection element (61), and the other end is connected to the first pressure-taking joint (63); A second pressure-taking tube (64) and a second pressure-taking connector (65), wherein the second pressure-taking connector (65) is arranged at the outlet of the air passage (3), one end of the second pressure-taking tube (64) is connected to the pressure difference detection element (61), and the other end is connected to the second pressure-taking connector (65).

5. The heating furnace according to claim 4, characterized in that: The material of the first pressure-taking tube (62) is silica gel; and / or The second pressure-taking tube (64) is made of silica gel.

6. The heating furnace according to claim 3, characterized in that: The pressure difference detection element (61) is a wind pressure sensor.

7. The heating furnace according to claim 2, characterized in that: The fan (22) is electrically connected to the controller (5), and the controller (5) is capable of adjusting the rotation speed of the fan (22).

8. The heating furnace according to claim 1, characterized in that: The air passage (3) includes an air filter (31), and an outlet of the air filter (31) is communicated with an inlet of the mixing passage (2).

9. The heating furnace according to claim 1, characterized in that: The gas pressure monitoring component (43) is a gas pressure switch or a pressure sensor.

10. The heating furnace according to any one of claims 1 to 9, characterized in that: The heating furnace further comprises a display (7), wherein the display (7) is electrically connected to the controller (5), and when the controller (5) controls the heating furnace to stop, the display (7) can display a fault prompt.

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