Porous media burner and thermal plant

Abstract

The application provides a porous medium burner and thermal equipment, and relates to the field of burners.The porous medium burner comprises a shell and a pressing mechanism, the shell is sequentially provided with a premixing chamber and a combustion chamber along an air inlet direction, the combustion chamber is provided with a porous heat insulation layer and a porous medium layer which are arranged in a superimposed manner along the air inlet direction, one side of the porous heat insulation layer away from the porous medium layer serves as an abutting surface, the pressing mechanism extends along the air inlet direction, one end of the pressing mechanism is connected with the shell, and the other end abuts against the abutting surface and applies pressure to the porous heat insulation layer, so that the porous heat insulation layer and the porous medium layer are always closely attached to each other.The porous medium burner can always keep the porous heat insulation layer and the porous medium layer closely attached to each other when used in a high-temperature environment, and effectively improves the combustion effect.

Description

Technical Field

[0001] The present application relates to the field of burners, and in particular to a porous medium burner and thermal equipment. Background Art

[0002] In most thermal equipment, the burner is inserted into the equipment so that the combustion heat release surface directly faces the internal cavity of the equipment to achieve better heating and insulation effects.

[0003] It was found during actual use that when the porous medium burner is used in a high-temperature environment, it has the problem of rapid heat diffusion and poor combustion effect. Summary of the Invention

[0004] The purpose of the embodiments of the present application is to provide a porous medium burner and thermal equipment, which can improve the technical problem of rapid heat diffusion and poor combustion effect when the porous medium burner is used in a high-temperature environment.

[0005] In a first aspect, an embodiment of the present application provides a porous medium burner, which includes a shell and a pressing mechanism.

[0006] The shell is provided with a premixing chamber and a combustion chamber in sequence along the air intake direction. The combustion chamber is provided with a porous insulation layer and a porous medium layer stacked along the air intake direction. The side of the porous insulation layer facing away from the porous medium layer serves as an abutting surface.

[0007] The pressing mechanism extends along the air inlet direction, one end of the pressing mechanism is connected to the shell, and the other end abuts against the abutting surface and applies pressure to the porous insulation layer to keep the porous insulation layer and the porous medium layer in close contact.

[0008] The porous medium burner provided in the present application, when the porous medium burner is used in a high-temperature environment, utilizes the introduction of a pressing mechanism so that the pressing mechanism always applies pressure and keeps the porous insulation layer and the porous medium layer always in close contact. The close contact between the two is utilized to make them close to the shell, thereby avoiding the formation of gaps between the porous insulation layer and the porous medium layer caused by the axial elongation of the shell due to thermal expansion, and alleviating the problem of rapid heat diffusion and poor combustion effect caused by the formation of gaps.

[0009] In a possible embodiment, the pressing mechanism includes an elastic member.

[0010] The elastic member is located in the premixing chamber, one end of the elastic member abuts against the shell, and the other end applies pressure to the abutting surface.

[0011] In the above implementation process, the elastic member is used to apply pressure to the abutting surface, which can cause it to expand and stretch adaptively, thereby facilitating the porous heat-insulating layer and the porous medium layer to always be in close contact.

[0012] In a possible embodiment, the clamping mechanism also includes: a guide pressure rod, the guide pressure rod extends along the air intake direction, the guide pressure rod has a first end and a second end relative to each other, the first end abuts against the abutment surface, and the second end is slidably connected to the shell, the elastic member is sleeved on the guide pressure rod and can be deformed along the axial direction of the guide pressure rod, one end of the elastic member abuts against the shell, and the other end applies pressure to the first end.

[0013] In the above implementation process, the guide pressure rod is used to guide the elastic member so that the elastic member is deformed along the axial direction of the guide pressure rod, which is conducive to the elastic member applying pressure to the first end of the guide pressure rod along the guide pressure rod, thereby driving the first end of the guide pressure rod to abut against the abutment surface and apply pressure to the abutment surface, so that the porous thermal insulation layer and the porous medium layer are always in close contact.

[0014] In a possible embodiment, the shell is provided with a mounting hole, and the second end is slidably inserted into the shell through the mounting hole; the clamping mechanism also includes a seal, which is sealed with the outer wall of the shell, and the seal is provided with a blind hole corresponding to and connected to the mounting hole, and the blind hole is used to accommodate the second end.

[0015] In the above implementation process, the provision of the sealing member is beneficial to improving the sealing performance of the housing, preventing the mixture and heat from overflowing from the mounting hole, and improving the combustion efficiency.

[0016] In a possible embodiment, the abutting surface has a central area and an edge area surrounding the central area, and the edge area abuts against the pressing mechanism.

[0017] The porous heat insulation layer has a plurality of pores extending along the air inlet direction, and the plurality of pores are all arranged in the central area.

[0018] In the above implementation process, the partition setting is used to prevent the compaction mechanism from affecting the mixed gas from entering the pores, while at the same time achieving a better gas uniformity effect in the porous insulation layer.

[0019] In a possible embodiment, the porous thermal insulation layer includes at least two layers of porous thermal insulation units stacked and arranged along the air inlet direction, wherein the pores of any two adjacent layers of porous thermal insulation units are connected to form a gas flow channel.

[0020] In the above implementation process, tempering can be avoided by increasing the thickness of the porous insulation board. However, since the existing porous insulation board is too thick and difficult to process, the thickness can be increased by multi-layer stacking according to actual needs, and the compression method can be used to avoid gaps between the porous insulation units during combustion, thereby affecting the combustion effect.

[0021] In a possible embodiment, the shell includes an inner shell, a heat insulation layer and a cover plate.

[0022] The inner shell has a channel running through it; a heat-insulating layer is arranged on the circumference of the inner shell; a cover plate is provided with an air inlet, and the cover plate is connected to the inner shell to close either end of the channel, and a premixing chamber and a combustion chamber are formed between the channel and the cover plate.

[0023] In the above implementation process, the premixing chamber and the combustion chamber are formed by connecting the inner shell and the cover plate. Compared with the existing multi-stage assembled shell, the sealing surface can be reduced and the sealing effect can be improved. The setting of the thermal insulation layer can avoid heat loss.

[0024] In a possible embodiment, the shell also includes: an outer shell, the outer shell is connected to the cover plate, the outer shell is arranged on the outer periphery of the inner shell, and a first interlayer is formed between the outer shell and the inner shell; the thermal insulation layer includes a first thermal insulation layer filled in the first interlayer.

[0025] In the above implementation process, the outer shell and the cover plate are connected to further improve the sealing of the shell, and the first thermal insulation layer is filled in the first interlayer, which not only avoids direct connection and heat transfer between the inner and outer shells and isolates the heat transfer between the inner and outer shells, but also protects the thermal insulation layer from falling off and being damaged by the outer shell.

[0026] In a possible embodiment, the shell has a second interlayer; the thermal insulation layer further includes a second thermal insulation layer filled in the second interlayer, and the second thermal insulation layer extends toward the cover plate with a gap between the second thermal insulation layer and the cover plate.

[0027] In the above implementation process, the second thermal insulation layer can be used to further isolate the heat loss in the combustion chamber, and due to the existence of the gap, the thermal insulation effect of the premixing chamber is weaker than that of the combustion chamber, thereby avoiding flashback caused by excessive temperature in the premixing chamber.

[0028] In a second aspect, an embodiment of the present application provides a thermal device, which includes a device body and the above-mentioned porous medium burner installed on the device body. The device body has a receiving cavity, and the porous medium burner is used to heat the receiving cavity.

[0029] In the above implementation process, the porous medium burner is used to heat the accommodating cavity to improve the heating efficiency. Even if the porous medium burner continues to heat in the high temperature environment of the accommodating cavity, the clamping mechanism is used to always apply pressure to keep the porous insulation layer and the porous medium layer in close contact, thereby avoiding the formation of gaps in the porous insulation layer and the porous medium layer due to the expansion and elongation of the shell due to heat, and alleviating the problem of rapid heat diffusion and poor combustion effect caused by the formation of gaps. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 A schematic cross-sectional view of a porous media burner provided in this application;

[0032] Figure 2 A schematic diagram of the structure of the porous media burner provided in this application;

[0033] Figure 3 A schematic diagram of the distribution of the pressing mechanism provided in this application on the abutment surface;

[0034] Figure 4 for Figure 1 A partial enlarged schematic diagram of point IV in the middle.

[0035] Icons: 10-porous medium burner; 110-inner shell; 120-thermal insulation layer; 121-first thermal insulation layer; 123-second thermal insulation layer; 130-cover plate; 131-inlet pipe; 140-outer shell; 150-premixing chamber; 151-gas distribution assembly; 161-porous insulation layer; 162-abutment surface; 163-central area; 164-edge area; 165-pores; 168-porous insulation unit; 169-gas flow channel; 170-porous medium layer; 180-third thermal insulation layer; 200-pressing mechanism; 210-guide pressure rod; 213-abutment block; 220-slider; 230-elastic member; 240-seal; 241-second blind hole. DETAILED DESCRIPTION

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of 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. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application without creative work are within the scope of protection of the present application.

[0038] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0039] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the product of this application is typically placed when in use. These terms are intended only to facilitate the description of this application and simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0040] Furthermore, terms such as "horizontal," "vertical," and "overhanging" do not necessarily imply that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0041] It should also be noted that, in the description of this application, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0042] For porous media burners that are inserted into thermal equipment and have the combustion heat release surface facing the internal cavity of the thermal equipment, there is a problem of rapid heat diffusion and poor combustion effect. The inventors found that since the shell of the porous media burner is made of metal and the porous media burner is assembled under normal temperature conditions, when the porous media burner is used in a high-temperature environment, its circumference is restricted by the thermal equipment, so the shell will produce a certain degree of axial elongation when it expands due to heat, resulting in gaps between the porous insulation layer and the porous media layer assembled together at room temperature. These gaps will cause rapid heat diffusion, resulting in poor combustion effect.

[0043] In response to the above research findings, the applicant attempted to introduce a pressing mechanism to apply pressure to the porous thermal insulation layer so that the porous thermal insulation layer and the porous medium layer are always in close contact, thereby alleviating the above technical problems to a certain extent.

[0044] The present application provides a thermal equipment, which includes an equipment body and a porous medium burner installed on the equipment body. The equipment body has an accommodating cavity, and the porous medium burner is used to heat the accommodating cavity.

[0045] The thermal equipment is, for example, a heating furnace or a heat preservation bag, etc., which is not limited here, and those skilled in the art can set it according to actual needs.

[0046] See also Figure 1 The porous medium burner 10 mainly includes a shell and a pressing mechanism 200.

[0047] The housing is sequentially provided with a premixing chamber 150 and a combustion chamber along the air intake direction. The combustion chamber is provided with a porous insulation layer 161 and a porous medium layer 170 stacked in the air intake direction. The surface of the porous insulation layer 161 facing away from the porous medium layer 170 serves as an abutment surface 162. A clamping mechanism 200 extends along the air intake direction. One end of the clamping mechanism 200 is connected to the housing, while the other end abuts against the abutment surface 162 and applies pressure to the porous insulation layer 161, ensuring a constant close contact between the porous insulation layer 161 and the porous medium layer 170.

[0048] like Figure 1 As shown, the air intake direction coincides with the axial direction of the porous medium burner 10 .

[0049] When the porous medium burner 10 is used in a high-temperature environment, the pressing mechanism 200 is introduced to apply pressure so that the porous insulation layer 161 and the porous medium layer 170 are always kept in close contact, thereby alleviating the problem of poor combustion effect caused by the gap between the porous insulation layer 161 and the porous medium layer 170 due to the expansion and elongation of the shell due to heat.

[0050] The shell can be multi-section or integrally formed.

[0051] Please continue reading Figure 1 The shell mainly includes an inner shell 110, a thermal insulation layer 120 and a cover plate 130.

[0052] Among them, the inner shell 110 has a channel running through the inner shell 110, and the thermal insulation layer 120 is arranged on the circumference of the inner shell 110; the cover plate 130 is provided with an air inlet, and the cover plate 130 is connected to the inner shell 110 to close either end of the channel, and a premixing chamber 150 and a combustion chamber are formed between the channel and the cover plate 130. At this time, the unclosed end of the channel serves as the combustion surface of the combustion chamber to release heat.

[0053] In order to improve the uniformity of heat radiation, the cross-section of the inner shell 110 is circular. Figure 1 as well as Figure 2 The air inlet is arranged at the center of the cover plate 130 and is connected to the air inlet pipe 131.

[0054] In order to improve the connection stability and airtightness between the inner shell 110 and the cover plate 130, optionally, a flange connection part is provided at one end of the inner shell 110 facing the cover plate 130, and the flange connection part is arranged around the outer periphery of the inner shell 110. The flange connection part and the cover plate 130 are connected, and a sealing gasket is provided at the connection between the flange connection part and the cover plate 130.

[0055] The heat insulation layer 120 can be arranged on the outer periphery of the inner shell 110 or on the inner periphery. When the heat insulation layer 120 is arranged on the outer periphery of the inner shell 110, in order to prevent the heat insulation layer 120 from falling off from the inner shell 110, please refer to Figure 1 The shell also includes an outer shell 140, which is connected to the cover plate 130. The outer shell 140 is sleeved on the outer periphery of the inner shell 110, and a first interlayer is formed between the outer shell 140 and the inner shell 110; the thermal insulation layer 120 includes a first thermal insulation layer 121 filled in the first interlayer.

[0056] The connection between the outer shell 140 and the cover plate 130 can further improve the sealing of the shell. The method of filling the first thermal insulation layer 121 into the first interlayer not only avoids direct connection and contact between the inner shell 110 and the outer shell 140, and isolates the heat transfer between the inner shell 110 and the outer shell 140, but also the outer shell 140 can protect the first thermal insulation layer 121 and prevent the first thermal insulation layer 121 from falling off or being damaged.

[0057] Among them, the outer shell 140 is tubular in shape, and the connection method between the outer shell 140 and the cover plate 130 can also refer to the connection method between the inner shell 110 and the cover plate 130, that is, the connection is carried out using a flange connection part + sealing gasket method, which will not be described in detail here.

[0058] During actual use, the shell 140 is connected to the device body. In order to avoid the temperature loss in the combustion chamber caused by the connection between the shell 140 and the device body, the shell 140 optionally has a second interlayer; the thermal insulation layer 120 also includes a second thermal insulation layer 123 filled in the second interlayer, and the second thermal insulation layer 123 extends toward the cover plate 130 and a gap is left between the cover plate 130.

[0059] The gap here means that the second thermal insulation layer 123 extends toward the cover plate 130 but does not extend to contact the cover plate 130 , and a certain distance is left between the two.

[0060] The second heat insulating layer 123 can further isolate the heat loss in the combustion chamber, and due to the existence of the gap, the heat insulation effect of the premixing chamber 150 is weaker than that of the combustion chamber, which can avoid flashback caused by excessive temperature in the premixing chamber 150.

[0061] It should be noted that when the porous medium burner 10 is installed in a thermal equipment, the shell 140 is connected to the thermal equipment. At this time, the premixing chamber 150 corresponding to at least a portion of the gap between the second thermal insulation layer 123 and the cover plate 130 is located outside the thermal equipment, thereby reducing the area of ​​the shell directly facing the high temperature inside the thermal equipment and alleviating the tempering problem caused by the excessive temperature in the premixing chamber 150.

[0062] Among them, the materials of the first thermal insulation layer 121 and the second thermal insulation layer 123 are both heat-resistant thermal insulation materials, and the materials of the two can be the same or different. At the same time, the thickness of the first thermal insulation layer 121 and the thickness of the second thermal insulation layer 123 can be the same or different.

[0063] Since the first heat insulation layer 121 is mainly used to block the heat transfer between the inner shell 110 and the outer shell 140, and the second heat insulation layer 123 is mainly used to insulate the combustion chamber, it is optional, such as Figure 1 As shown, the thickness of the first thermal insulation layer 121 is less than the thickness of the second thermal insulation layer 123 , where the thickness refers to the thickness in the radial direction of the porous medium burner 10 .

[0064] The materials of the inner shell 110 and the outer shell 140 are both high-temperature resistant metals. For details, please refer to relevant technologies and are not limited here.

[0065] An air distribution assembly 151 is provided in the premixing chamber 150 . The air distribution assembly 151 is used to further evenly mix the gas and air in the mixed gas. The air distribution assembly 151 is, for example, a porous air distribution plate arranged below the air inlet.

[0066] The mixed gas passes through the gas distribution assembly 151 and enters the porous heat insulation layer 161 , and then enters the porous medium layer 170 through the porous heat insulation layer 161 to be burned.

[0067] The porous heat-insulating layer 161 is, for example, an alumina porous plate.

[0068] In order to prevent the pressing mechanism 200 from interfering with the mixed gas entering the porous insulation layer 161, Figure 3 As shown, the abutting surface 162 of the porous thermal insulation layer 161 has a central area 163 and an edge area 164 surrounding the central area 163, the edge area 164 abuts against the clamping mechanism 200, and the porous thermal insulation layer 161 has a plurality of pores 165 extending along the air intake direction, and the plurality of pores 165 are all arranged in the central area 163.

[0069] The plurality of apertures 165 may be arranged at equal intervals in the central region 163 .

[0070] The inventors discovered that the thickness of the porous insulation layer 161 is related to the amount of heat transferred from the final abutment surface 162 to the premixing chamber 150. This means that tempering can be avoided by thickening the porous insulation layer 161. However, in practice, increasing the thickness of the porous insulation layer 161 increases the difficulty of drilling and affects the uniformity of the pores 165. Therefore, the thickness of the porous insulation layer 161 on the market is generally fixed, and a multi-layer arrangement easily leads to gaps between layers during combustion in the porous medium burner 10, affecting the combustion effect. The porous medium burner 10 provided in this application includes a pressing mechanism 200 that can avoid gaps between layers.

[0071] So optionally, see Figure 1 The porous insulation layer 161 includes at least two layers of porous insulation units 168 stacked along the air intake direction, wherein the pores 165 of any two adjacent layers of porous insulation units 168 are connected to form a gas flow channel 169. In other words, the thickness of the porous insulation layer 161 is increased by stacking multiple layers, and the compression method is used to prevent gaps between the porous insulation units 168 during combustion, which would affect the combustion effect.

[0072] The material of the porous medium layer 170 can be one or more of stacked ceramic balls, foam structure materials, honeycomb structure materials, array structure materials and random fiber structure materials, and those skilled in the art can select according to actual needs.

[0073] It can be understood that the porous medium layer 170 is arranged corresponding to the central area 163 of the porous heat-insulating layer 161, and the edge of the porous medium layer 170 extends out of the positive projection of the central area 163 thereon. In this case, the circumference of the porous medium layer 170 can be provided with the following Figure 1 The third thermal insulation layer 180 shown can be made of the same material as the first thermal insulation layer 121 .

[0074] See also Figure 1 as well as Figure 4 , the clamping mechanism 200 and the elastic member 230 .

[0075] Among them, the elastic member 230 is located in the premixing chamber 150, one end of the elastic member 230 abuts against the cover plate 130, and the other end applies pressure to the abutting surface 162. The elasticity of the elastic member can be used to enable it to adaptively expand and stretch, which is beneficial for keeping the porous insulation layer 161 and the porous medium layer 170 always in close contact at different times.

[0076] It is understandable that, since the elastic member 230 is located in the premixing chamber 150 , the elastic member 230 is made of a high-temperature resistant material, such as metal.

[0077] The elastic member 230 may be an elastic laminate, an elastic sleeve or a bellows, etc.Figure 4 As shown, in this embodiment, the elastic member 230 is a spring.

[0078] In order to limit the direction of the pressure applied by the elastic member 230 to a preset direction, for example, in order to make the pressure applied by the elastic member 230 perpendicular to the abutting surface 162, so as to avoid deviation under the premise that the porous thermal insulation layer 161 and the porous medium layer 170 are always in close contact, optionally, the clamping mechanism 200 further includes: a guide pressure rod 210. The guide pressure rod 210 extends along the air intake direction, and the guide pressure rod 210 has a first end and a second end relative to each other, the first end abuts against the abutting surface 162, and the second end is slidably connected to the shell, the elastic member 230 is sleeved on the guide pressure rod 210 and can be deformed along the axial direction of the guide pressure rod 210, one end of the elastic member 230 abuts against the cover plate 130, and the other end applies pressure to the first end.

[0079] Optionally, a supporting block 213 is provided at the first end, and the cross-sectional area of ​​the supporting block 213 is larger than the cross-sectional area of ​​the first end. The elastic member 230 is connected to the supporting block 213 and applies pressure to the supporting block 213. The setting of the supporting block 213 is utilized to increase the supporting area and disperse the pressure applied by the elastic member 230, thereby avoiding damage to the abutting surface 162 due to concentrated pressure.

[0080] Optionally, the clamping mechanism 200 includes a slider 220 slidably mounted on the guide pressure rod 210, the slider 220 is located in the premixing chamber, and the two ends of the elastic member 230 respectively abut against the slider 220 and the abutting block 213, and the elastic force of the elastic member 230 is used to make the slider 220 abut against the cover plate 130.

[0081] The second end is slidably connected to the housing. For example, the cover plate 130 is provided with a first blind hole communicating with the premixing chamber 150 , and the second end is slidably inserted into the first blind hole.

[0082] In this embodiment, the cover plate 130 is provided with a mounting hole, and the second end can be slidably inserted into the shell through the mounting hole; the clamping mechanism 200 also includes a sealing member 240, which is sealedly connected to the outer wall of the cover plate 130, and the sealing member 240 is provided with a second blind hole 241 corresponding to and connected to the mounting hole, and the second blind hole 241 is used to accommodate the second end.

[0083] The number of the pressing mechanisms 200 is one or more, wherein the multiple pressing mechanisms 200 are disposed around the center of the abutting surface 162 and are distributed at equal intervals. The multiple here can be two, three, four, etc., for example.

[0084] like Figure 3As shown, in this embodiment, there are three pressing mechanisms 200, which are arranged around the center of the abutting surface 162 and are evenly spaced. This not only evenly distributes the pressure on the abutting surface 162, improving the adhesion between the porous insulation layer 161 and the porous medium layer 170, but also reduces manufacturing costs.

[0085] Optionally, a line connecting the centers of gravity of the three pressing mechanisms 200 forms an equilateral triangle, which further improves the lamination effect of the porous thermal insulation layer 161 and the porous medium layer 170 .

[0086] In summary, when the porous medium burner provided in the present application is used in a high-temperature environment, the introduction of a clamping mechanism is utilized so that the clamping mechanism always applies pressure and keeps the porous insulation layer and the porous medium layer always in close contact, thereby alleviating the problem of a gap between the porous insulation layer and the porous medium layer caused by the expansion and elongation of the shell due to heat, and the rapid diffusion of heat caused by the generation of the gap, resulting in poor combustion effect.

[0087] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A porous medium burner, characterized in that: include: A housing, wherein a premixing chamber and a combustion chamber are sequentially provided along an air intake direction, wherein a porous heat-insulating layer and a porous medium layer are provided in the combustion chamber and are stacked and arranged along the air intake direction, and a side of the porous heat-insulating layer facing away from the porous medium layer serves as an abutting surface; and a pressing mechanism extending along the air inlet direction, one end of the pressing mechanism being connected to the shell, and the other end being abutted against the abutting surface and applying pressure to the porous thermal insulation layer so that the porous thermal insulation layer and the porous medium layer are always in close contact; The pressing mechanism includes an elastic member located in the premixing chamber, one end of the elastic member abuts against the shell, and the other end applies the pressure to the abutting surface.

2. The porous media burner according to claim 1, characterized in that: The pressing mechanism further comprises: a guide pressure rod; The guide pressure rod extends along the air intake direction, and has a first end and a second end relative to each other. The first end abuts against the abutment surface, and the second end is slidably connected to the shell. The elastic member is sleeved on the guide pressure rod and can be deformed along the axial direction of the guide pressure rod. One end of the elastic member abuts against the shell, and the other end applies the pressure to the first end.

3. The porous media burner according to claim 2, characterized in that: The housing is provided with a mounting hole, and the second end is slidably disposed in the housing through the mounting hole; The pressing mechanism further includes a sealing member, which is sealed and connected to the outer wall of the shell. The sealing member is provided with a blind hole corresponding to and communicating with the mounting hole, and the blind hole is used to accommodate the second end.

4. The porous media burner according to claim 1, characterized in that: The abutting surface has a central area and an edge area surrounding the central area, and the edge area abuts against the pressing mechanism; The porous heat-insulating layer has a plurality of pores extending along the air inlet direction, and the plurality of pores are all arranged in the central area.

5. The porous media burner according to claim 1, characterized in that: The porous heat-insulating layer comprises at least two layers of porous heat-insulating units stacked and arranged along the air inlet direction, wherein the pores of any two adjacent layers of the porous heat-insulating units are connected to form a gas flow channel.

6. The porous medium burner according to any one of claims 1 to 5, characterized in that: The housing comprises: an inner shell having a passage extending therethrough; a heat-insulating layer, arranged in the circumference of the inner shell; and A cover plate is provided with an air inlet, and the cover plate is connected to the inner shell to close either end of the channel, and the premixing chamber and the combustion chamber are formed between the channel and the cover plate.

7. The porous media burner according to claim 6, characterized in that: The housing further comprises: an outer shell connected to the cover plate, the outer shell being sleeved on the outer circumference of the inner shell, and a first interlayer being formed between the outer shell and the inner shell; The heat insulation layer includes a first heat insulation layer filled in the first interlayer.

8. The porous media burner according to claim 7, characterized in that: The shell has a second interlayer; The heat insulation layer further includes a second heat insulation layer filled in the second interlayer, and the second heat insulation layer extends toward the cover plate with a gap left between the second heat insulation layer and the cover plate.

9. A thermal equipment, characterized in that: include: The device body has a receiving cavity, and The porous medium burner according to any one of claims 1 to 8 is installed on the equipment body, and is used to heat the accommodating cavity.

Images