A CO2 gas electromagnetic heating element and control method

Abstract

The present invention relates to the field of electric heating technology, and specifically discloses a CO2 gas electromagnetic heating heating element and control method, including: a coil and a heating body arranged in a shell, the coil is energized to make the heating body in the coil generate heat; at least one medium flow channel is arranged in the heating body, and the shell is provided with a medium inlet and a medium outlet connected to the medium flow channel. The effect of the energized coil on the heating body can make the heating body heat up quickly, and has high power, high heating temperature, higher heat conversion rate, and is easy to control the temperature, and can be applied to a variety of working conditions; the medium flow channel can improve the heat exchange efficiency between the medium and the heating body; in addition, the coil does not require a large amount of cooling circulating water to cool it, which is more energy-saving and environmentally friendly.

Description

Technical Field

[0001] The present invention relates to the technical field of electric heating, and more specifically, to a CO2 gas electromagnetic heating element and a control method thereof. Background Art

[0002] Currently, gas heating and heat transfer are achieved through pipe heaters or high-frequency heating. When heating gas through pipe heaters, the heat conversion rate is low, the efficiency is low, and the temperature rises slowly. High-frequency heating of gas media such as CO2 has a low thermal effect, a large temperature gradient, and fine control is difficult to achieve. In addition, the heating coil requires a large amount of cooling circulating water, and the application scenarios are limited.

[0003] Therefore, it is necessary to propose an electromagnetic heating element and a control method for CO2 gas to at least partially solve the problems existing in the prior art. Summary of the invention

[0004] A series of simplified concepts are introduced in the Summary of the Invention, which will be further described in detail in the Detailed Description of the Invention. The Summary of the Invention does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the scope of protection of the claimed technical solution.

[0005] In order to at least partially solve the above-mentioned problems, the present invention provides an electromagnetic heating heating element for CO2 gas, comprising: a coil and a heating body arranged in a shell, when the coil is energized, the heating body in the coil is heated; at least one medium flow channel is arranged in the heating body, and a medium inlet and a medium outlet connected to the medium flow channel are arranged on the shell.

[0006] Preferably, temperature sensors are provided at the medium inlet and the medium outlet, and the temperature sensors are used to detect the temperature of the medium before and after the medium is heated.

[0007] Preferably, a heat insulation layer is provided on the outer side of the shell.

[0008] Preferably, a perforated plate is provided on the side of the end cover of the shell close to the heating body, a gathering cavity is formed between the perforated plate and the heating body, and a guide hole is provided on the side of the perforated plate away from the heating body, and the guide hole is connected to the medium inlet or the medium outlet.

[0009] Preferably, the medium flow channel is a first flow channel;

[0010] Alternatively, the medium flow channel is a second flow channel;

[0011] Alternatively, the medium flow channel is a combination of a first flow channel and a second flow channel, and the first flow channel is arranged outside the second flow channel.

[0012] Preferably, the first flow channel is a spiral flow channel.

[0013] Preferably, the second flow channel includes: a plurality of flow channel layers arranged along the flow direction of the medium and connected in sequence, and the plurality of flow channel layers are interconnected; a plurality of connecting ports are respectively arranged on two opposite sides of the flow channel layers, and the connecting ports on the two sides are arranged alternately; two adjacent flow channel layers are connected through connecting ports; and the connecting ports of the two flow channel layers located at both ends of the second flow channel are respectively connected to the medium inlet and the medium outlet.

[0014] Preferably, when the medium flow channel is a combination of a first flow channel and a second flow channel, at least one end of the heat generating body is provided with a first cavity communicating with the first flow channel, a second cavity communicating with the second flow channel, and the first cavity and the second cavity arranged near the medium inlet are provided with a first through hole and a second through hole respectively;

[0015] A sealing plate is also provided on the outer side of the end of the heating body, and two groups of connecting holes are provided on the sealing plate, wherein one group of connecting holes can make the first through hole and the second through hole open at the same time, and the other group of connecting holes can make one of the first through hole and the second through hole open and the other closed.

[0016] The present invention also provides a control method for an electromagnetic heating element, which is applied to the electromagnetic heating element for CO2 gas of the present invention, comprising:

[0017] According to the target temperature of the medium required at the medium outlet and the allowable temperature error corresponding to the target temperature, the temperature adjustment range and the temperature stabilization range are obtained;

[0018] Get the current temperature at the medium outlet in real time;

[0019] If the current temperature is within the temperature adjustment range, the absolute value of the temperature difference between the current temperature and the target temperature is obtained;

[0020] If the absolute value of the temperature difference at the current moment is greater than the absolute value of the temperature difference at the previous moment, the coil is controlled according to the temperature difference corresponding to the absolute value of the temperature difference at the current moment to control the heating temperature of the heating body.

[0021] Preferably, the temperature adjustment interval and the temperature stabilization interval are obtained according to the target temperature of the medium required at the medium outlet and the allowable temperature error corresponding to the target temperature, including:

[0022] According to the target temperature and the allowable temperature error, obtain the minimum temperature value of the temperature adjustment range and maximum temperature ;

[0023] Determine the minimum temperature value of the temperature stability range according to the set ratio of the allowable temperature error and maximum temperature ;

[0024] The temperature adjustment interval includes: a first adjustment interval and a second adjustment interval;

[0025] The first adjustment interval obtained is , the second adjustment interval is The temperature stability range is .

[0026] Compared with the prior art, the present invention has at least the following beneficial effects:

[0027] The electromagnetic heating heating element and control method of CO2 gas described in the present invention can quickly heat up the heating body through the effect of the energized coil on the heating body, and has high power, high heating temperature, higher heat conversion rate, and is easy to control the temperature, and can be applied to various working conditions; the medium flow channel can improve the heat exchange efficiency between the medium and the heating body; in addition, the coil does not require a large amount of cooling circulating water to cool it, which is more energy-saving and environmentally friendly.

[0028] The electromagnetic heating heating element and control method of CO2 gas described in the present invention, and other advantages, objectives and features of the present invention will be reflected in part through the following description, and in part will also be understood by technicians in this field through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0030] Figure 1 The medium flow channel of the electromagnetic heating element of CO2 gas of the present invention is a schematic diagram of the internal structure of the first flow channel;

[0031] Figure 2 The medium flow channel of the electromagnetic heating element of CO2 gas of the present invention is a schematic diagram of the internal structure of the second flow channel;

[0032] Figure 3 This is a schematic diagram of a first internal structure when the medium flow channel of the electromagnetic heating element for CO2 gas of the present invention is a combination of a first flow channel and a second flow channel;

[0033] Figure 4 A schematic diagram of a second internal structure when the medium flow channel of the electromagnetic heating element for CO2 gas of the present invention is a combination of the first flow channel and the second flow channel;

[0034] Figure 5 For Figure 4 A schematic diagram of the structure of the corresponding heating body;

[0035] Figure 6 For Figure 3 The structural schematic diagram of the corresponding heating body and sealing plate;

[0036] Figure 7 It is a structural schematic diagram of the heating body and the sealing plate in the electromagnetic heating heating element for CO2 gas of the present invention;

[0037] Figure 8 It is a schematic diagram of the flow of the medium in the first flow channel of the electromagnetic heating element of CO2 gas according to the present invention;

[0038] Fig. 9 It is a schematic diagram of the flow of the medium in the second flow channel of the electromagnetic heating element of CO2 gas according to the present invention;

[0039] Fig.10 It is a schematic diagram of the medium in the electromagnetic heating heating element of CO2 gas of the present invention flowing simultaneously in the first flow channel and the second flow channel;

[0040] Fig.11 It is a side view structural schematic diagram of the second flow channel in the electromagnetic heating element for CO2 gas of the present invention;

[0041] Fig.12 for Fig.11 Schematic diagram of the cross-sectional structure at AA;

[0042] Fig.13 It is a schematic structural diagram of a dispersion unit in the electromagnetic heating element for CO2 gas of the present invention, wherein the communication port faces the first direction;

[0043] Fig.14 It is a schematic diagram of the arrangement position of the dispersion units with the communication openings facing the first direction in the electromagnetic heating element for CO2 gas of the present invention;

[0044] Fig.15 It is a schematic structural diagram of a dispersion unit in the electromagnetic heating element for CO2 gas of the present invention, wherein the communication port faces the second direction;

[0045] Fig.16 This is a schematic diagram of the arrangement position of the dispersion units with the connecting opening facing the second direction in the electromagnetic heating element for CO2 gas described in the present invention. DETAILED DESCRIPTION

[0046] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments so that those skilled in the art can implement the invention with reference to the description.

[0047] It should be understood that the terms such as “having”, “including” and “comprising” used herein do not exclude the existence or addition of one or more other elements or combinations thereof.

[0048] like Figure 1 As shown, the present invention provides an electromagnetic heating heating element for CO2 gas, comprising: a coil 1 and a heating body 3 arranged in a shell 2, when the coil 1 is energized, the heating body 3 in the coil 1 generates heat; at least one medium flow channel is arranged in the heating body 3, and the shell 2 is provided with a medium inlet 4 and a medium outlet 5 connected to the medium flow channel.

[0049] After the coil 1 is energized, a high-frequency magnetic field is generated in the coil 1, so that the heating body 3 in the coil 1 is induced by the magnetic field and generates heat, thereby converting electrical energy into thermal energy of the heating body 3. The heating body 3 and the coil 1 do not need any physical contact to achieve energy conversion; a medium with a certain flow rate and pressure, such as carbon dioxide gas CO2, enters from the medium inlet 4, and when passing through the medium flow channel in the heating body 3, the carbon dioxide gas and the heating body 3 generate heat transfer, thereby heating the passing carbon dioxide gas, and the heated carbon dioxide gas is then discharged from the medium outlet 5; by controlling the power of the coil 1, the temperature of the heating body 3 can be changed, thereby achieving control of the heating temperature of the carbon dioxide gas.

[0050] Among them, carbon dioxide is used as the medium, which has a certain stability and can be applied to a variety of working conditions.

[0051] The length and shape of the medium flow channel can be set according to the required heating power per unit volume mass and requirements. The heating body 3 is made of materials that are resistant to high temperatures, not easily oxidized, and can generate heat under magnetic field induction.

[0052] Through the above design, the effect of the energized coil 1 on the heating body 3 can cause the heating body 3 to heat up quickly, and the power is large, the heating temperature is high (can reach 800 degrees Celsius-1100 degrees Celsius), the heat conversion rate is higher, and it is easy to control the temperature, and can be applied to a variety of working conditions; the medium flow channel can improve the heat exchange efficiency between the medium and the heating body 3; in addition, the coil 1 does not require a large amount of cooling circulating water to cool it, which is more energy-saving and environmentally friendly.

[0053] like Figure 1 As shown, in one embodiment, temperature sensors 13 are provided at the medium inlet 4 and the medium outlet 5, and the temperature sensors 13 are used to detect the temperature of the medium before and after the medium is heated.

[0054] The temperature sensor 13 can obtain the temperature at the medium inlet 4 and the medium outlet 5 in real time, thereby realizing the control of the power of the coil 1, and then realizing the control of the medium heating, so that the temperature of the carbon dioxide gas discharged from the medium outlet 5 can be accurately controlled.

[0055] like Figure 1 As shown, in one embodiment, a heat insulation layer 6 is provided on the outer side of the housing 2 .

[0056] A heat insulation layer 6 with heat preservation and heat insulation functions is arranged on the outer side of the shell 2. The heat insulation layer 6 can be made of heat insulation materials such as heat insulation cotton to prevent heat transfer between the heating body 3 and the outside world and reduce heat loss.

[0057] like Figure 2 As shown, in one embodiment, a perforated plate 22 is provided on the side of the end cover 21 of the shell 2 close to the heat generating body 3, a gathering cavity 23 is formed between the perforated plate 22 and the heat generating body 3, and a guide hole 24 is provided on the side of the perforated plate 22 away from the heat generating body 3, and the guide hole 24 is connected to the medium inlet 4 or the medium outlet 5.

[0058] The guide hole 24 located on the side of the medium inlet 4 is used to guide the incoming medium to the orifice plate 22, and the medium is dispersed into the gathering chamber 23 through the orifice plate 22, and then the medium enters the medium flow channel from the gathering chamber 23 for heat exchange; after the medium is discharged from the medium flow channel, it first enters the gathering chamber 23 located on the side of the medium outlet 5, and then is dispersed through the orifice plate 22 and enters the guide hole 24, and is discharged from the medium outlet 5 under the guiding action of the guide hole 24.

[0059] In one embodiment, the medium flow channel is a first flow channel 7;

[0060] Alternatively, the medium flow channel is the second flow channel 8;

[0061] Alternatively, the medium flow channel is a combination of a first flow channel 7 and a second flow channel 8 , and the first flow channel 7 is arranged outside the second flow channel 8 .

[0062] Furthermore, the first flow channel 7 is a spiral flow channel.

[0063] Furthermore, the second flow channel 8 includes: a plurality of flow channel layers arranged along the medium flow direction and connected in sequence, and the plurality of flow channel layers are interconnected; a plurality of connecting ports 91 are respectively arranged on two opposite sides of the flow channel layers, and the connecting ports 91 on the two sides are arranged alternately; two adjacent flow channel layers are connected through the connecting ports 91; and the connecting ports 91 of the two flow channel layers located at both ends of the second flow channel 8 are respectively connected to the medium inlet 4 and the medium outlet 5.

[0064] In this embodiment, three implementation forms of the medium flow channel are provided:

[0065] like Figure 1 The first type is shown, in which a medium flow channel, namely the first flow channel 7, is arranged inside the heat generating body 3. The medium is a spiral flow channel. When the medium passes through the first flow channel 7, the medium moves in a spiral shape and can fully exchange heat with the heat generating body 3. The flow resistance of the medium through the spiral flow channel is small.

[0066] like Figure 2 The second type is shown, in which a medium flow channel, namely the second flow channel 8, is arranged inside the heating body 3, and a plurality of flow channel layers are connected in sequence. Each flow channel layer allows the medium to enter through a connecting port 91 on one side, and allows the medium to be discharged through a connecting port 91 on the other side. Since the connecting ports 91 on both sides are arranged in a staggered manner, the medium enters through the connecting port 91 on one side when passing through each flow channel layer, and then disperses inside the flow channel layer to be discharged from the connecting port 91 on the other side. When dispersed inside the flow channel layer, the contact between the medium and the flow channel layer can be increased, thereby improving the heat exchange capacity. At the same time, compared with the first flow channel 7, the flow resistance of the medium through the second flow channel 8 is larger, but it has better heat exchange capacity.

[0067] like Figure 3 The third type is shown, in which two medium flow channels are arranged inside the heat generating body 3, i.e., a combination of the first flow channel 7 and the second flow channel 8. The medium can be heat exchanged through the first flow channel 7 alone or through the second flow channel 8 alone, or through the first flow channel 7 and the second flow channel 8 at the same time, which can meet different working conditions;

[0068] like Figure 8 The first working condition is shown. , using the first flow channel 7, wherein, is the enthalpy of the airflow at the medium outlet 5, is the enthalpy of the airflow at the four medium inlets, is the set enthalpy difference; under this condition, it indicates that when the medium passes through the medium flow channel, a strong heat exchange efficiency is not required; for example, when used under the circulating medium heating condition, the medium circulates in a space to ensure the temperature in this space. When a strong heat exchange efficiency is not required, the first flow channel 7 can be used for heat exchange so that the medium can pass through the medium flow channel with less resistance, thereby increasing the medium flow at the medium outlet 5 and increasing the speed of medium circulation to achieve the effect of keeping the space warm.

[0069] like Fig. 9 The second working condition is shown. , and the required flow rate is less than or equal to the set flow rate, the second flow channel 8 is used; wherein the required flow rate is the medium flow rate required by the space to be heated, and the set flow rate can be set according to the flow rate that the second flow channel 8 can provide; under this condition, it means that when the medium passes through the medium flow channel, a stronger heat exchange efficiency is required to enable the medium to heat up quickly, and a higher flow rate is not required, which can meet the use requirements; for example, when providing heat to a smaller space or a smaller area, the second flow channel 8 can be used to quickly heat up the medium and provide the required medium temperature.

[0070] like Fig.10 The third working condition is shown. , and the required flow rate is greater than the set flow rate, the first flow channel 7 and the second flow channel 8 are used; under this working condition, it indicates that when the medium passes through the medium flow channel, a stronger heat exchange efficiency is required to enable the medium to heat up quickly, and a higher flow rate is required to meet the use requirements. The second flow channel 8 can heat the medium quickly, and the first flow channel 7 can reduce the medium flow resistance, thereby providing a larger medium flow rate. In this way, the medium is discharged from the first flow channel 7 and the second flow channel 8 respectively and then mixed, which can provide a larger flow of medium, and at the same time utilize the higher heat exchange efficiency of the second flow channel 8 to increase the temperature of the discharged medium, make full use of the heat energy converted from electrical energy, and save energy use; for example, when providing heat to a larger space, the first flow channel 7 and the second flow channel 8 can simultaneously provide the space with a certain temperature and a larger flow of medium, so that it can heat up quickly.

[0071] like Figure 11-Figure 16 As shown, in one embodiment, the flow channel layer includes: a plurality of interconnected dispersion units 9, each of which is provided with a connecting port 91 and at least three dispersion ports 92 that are interconnected; among the plurality of dispersion units 9 in the same flow channel layer, the connecting ports 91 of a portion of the dispersion units 9 face the first direction, and a first installation space 15 is formed between adjacent dispersion units 9, and the connecting ports 91 of another portion of the dispersion units 9 face the second direction, and a first installation space 16 is formed between adjacent dispersion units 9, and the first direction and the second direction are arranged oppositely; in the same flow channel layer, the dispersion ports 92 of the dispersion units 9 whose connecting ports 91 face the first direction are connected to the dispersion ports 92 of the dispersion units 9 whose connecting ports 91 face the second direction.

[0072] The plurality of dispersed units 9 are evenly arranged based on the two directions of the connecting opening 91, such as Fig.13 and Fig.14 The figure shows a dispersion unit 9 with the communication port 91 facing the first direction, and a first installation space 15 is formed between adjacent dispersion units 9. Fig.15 and Fig.16 The communication opening 91 of the dispersing unit 9 is arranged toward the second direction, and a second installation space 16 is formed between adjacent dispersing units 9. Fig.14 The multiple dispersed units 9 are arranged in Fig.16 In the plurality of second installation spaces 16, and with Fig.16 The multiple dispersion units 9 are connected through the dispersion port 92, and at the same time Fig.16 The multiple dispersed units 9 are arranged accordingly in Fig.14 In the plurality of first installation spaces 15, a flow channel layer is formed, and adjacent flow channel layers are connected through the communication port 91, thereby forming a Fig.12 The second flow channel 8 shown; the communication ports 91 of the flow channel layer located at both ends of the second flow channel 8 are respectively connected to the medium inlet 4 and the medium outlet 5;

[0073] After the medium enters from a connecting port 91 (first direction) of a flow channel layer, it is dispersed in the dispersion unit 9, discharged to multiple dispersion units 9 adjacent to this dispersion unit 9 through multiple dispersion ports 92, and then discharged from the connecting port 91 (second direction) of the adjacent dispersion unit 9. In this way, the medium passes through multiple flow channel layers to achieve efficient heat exchange.

[0074] like Figure 3 and Figure 7 As shown, in one embodiment, when the medium flow channel is a combination of the first flow channel 7 and the second flow channel 8, at least one end of the heat generating body 3 is provided with a first cavity 31 communicating with the first flow channel 7, and a second cavity 32 communicating with the second flow channel 8, and the first cavity 31 and the second cavity 32 arranged near the medium inlet 4 are respectively provided with a first through hole 311 and a second through hole 321;

[0075] A sealing plate 10 is also provided on the outer side of the end of the heating body 3, and two groups of connecting holes 11 are provided on the sealing plate 10, one group of connecting holes 11 can make the first through hole 311 and the second through hole 321 open at the same time, and the other group of connecting holes 11 can make one of the first through hole 311 and the second through hole 321 open and the other one closed.

[0076] The device further comprises: a driving unit 12 for driving the sealing plate 10 to rotate, and the driving unit 12 is disposed on the orifice plate 22 .

[0077] The first cavity 31 is an annular cavity, which is arranged outside the second cavity 32. The first through hole 311 is a quarter of an annular shape, and the second through hole 321 is a quarter of a circle. Each group of communicating holes 11 on the sealing plate 10 includes a communicating hole A corresponding to the first through hole 311 and a communicating hole B corresponding to the second through hole 321, wherein the communicating holes A and the communicating holes B in one group of communicating holes 11 are located in the same sector-shaped area of ​​the sealing plate 10, and the communicating holes A and the communicating holes B in another group of communicating holes 11 are located in the oppositely arranged sector-shaped areas of the sealing plate 10.

[0078] By controlling the sealing plate 10 to rotate through the driving unit 12, the first flow channel 7 and the second flow channel 8 can be controlled to selectively communicate with the medium inlet 4, thereby realizing the selection of the medium flow channel that the medium needs to pass through according to the actual working conditions.

[0079] Further, for the arrangement of the end of the heating body 3 near the medium outlet 5, two implementation methods are provided:

[0080] like Figure 3 and Figure 6 The first type is shown, in which the first cavity 31 and the second cavity 32 arranged near the medium outlet 5 are both connected to the gathering cavity 23;

[0081] The medium discharged from the first flow channel 7 and the second flow channel 8 is discharged from the orifice plate 22 through the gathering chamber 23. The medium discharged from the first flow channel 7 and the second flow channel 8 can be mixed through the gathering chamber 23 and the orifice plate 22, thereby improving the accuracy of the temperature sensor in detecting the medium temperature at the medium outlet 5.

[0082] like Figure 4 and Figure 5 The second type is shown, in which the first cavity 31 near the medium outlet 5 is connected to the dispersion port 92 of the flow channel layer at the end through a plurality of third through holes 14;

[0083] The second flow channel 8 is formed by connecting multiple flow channel layers in sequence, and a flow channel layer near the medium outlet 5 can be used as a medium mixing layer, that is, the medium discharged from the first flow channel 7 first enters the first cavity 31, and then enters the multiple dispersion ports 92 of the flow channel layer from the multiple third through holes 14, and the medium in the second flow channel 8 will be mixed with the medium discharged from the first flow channel 7 in the flow channel layer near the medium outlet 5, and then enter the gathering cavity 23 from the multiple connecting ports 91 of the second flow channel 8 (that is, the flow channel layer located at the end), thereby improving the mixing effect of the medium discharged from the first flow channel 7 and the second flow channel 8, making the temperature of the discharged medium more uniform, and further improving the detection accuracy of the temperature sensor.

[0084] The present invention also provides a control method for an electromagnetic heating element, which is applied to the electromagnetic heating element for CO2 gas of the present invention, comprising:

[0085] According to the target temperature of the medium required at the medium outlet 5 and the allowable temperature error corresponding to the target temperature, a temperature adjustment range and a temperature stabilization range are obtained;

[0086] Real-time acquisition of the current temperature at the medium outlet 5;

[0087] If the current temperature is within the temperature adjustment range, the absolute value of the temperature difference between the current temperature and the target temperature is obtained;

[0088] If the current temperature is within the temperature stability range, there is no need to control the current temperature;

[0089] If the absolute value of the temperature difference at the current moment is greater than the absolute value of the temperature difference at the previous moment, the coil 1 is controlled according to the temperature difference corresponding to the absolute value of the temperature difference at the current moment to control the heating temperature of the heating body 3;

[0090] If the absolute value of the temperature difference at the current moment is less than or equal to the absolute value of the temperature difference at the previous moment, there is no need to control the coil 1.

[0091] Furthermore, according to the target temperature of the medium required at the medium outlet 5 and the allowable temperature error corresponding to the target temperature, the temperature adjustment range and the temperature stabilization range are obtained, including:

[0092] According to the target temperature and the allowable temperature error, obtain the minimum temperature value of the temperature adjustment range and maximum temperature ;

[0093] Determine the minimum temperature value of the temperature stability range according to the set ratio of the allowable temperature error and maximum temperature ;

[0094] The temperature adjustment interval includes: a first adjustment interval and a second adjustment interval;

[0095] The first adjustment interval obtained is , the second adjustment interval is The temperature stability range is .

[0096] In the above scheme, the target temperature is , and the corresponding allowable temperature error is , then the minimum temperature value of the temperature adjustment range , maximum temperature value ;

[0097] The setting ratio of the allowable temperature error is ,and , the minimum temperature value of the temperature stability range can be obtained and maximum temperature , thereby obtaining the first adjustment interval, the second adjustment interval and the temperature stabilization interval.

[0098] If the current temperature is in the temperature stability range When it is within, it indicates that the error between the current temperature and the target temperature is very small, and the temperature requirement of the medium at the medium outlet 5 can be met without adjusting the current temperature;

[0099] If the current temperature is within the temperature adjustment range, that is, in the first adjustment range Or the second adjustment range If the absolute value of the temperature difference at the current moment is within the range of 100°, it is necessary to continue to judge the absolute value of the temperature difference at the previous moment;

[0100] If the absolute value of the temperature difference at the current moment is greater than the absolute value of the temperature difference at the previous moment, it indicates that the error between the current temperature of the medium at the medium outlet 5 and the target temperature increases with time, and there is a possibility of exceeding the allowable temperature error. Therefore, it is necessary to control the current temperature in time, that is, to control the power of the coil 1 to control the heating temperature of the heating body 3; for example, the current temperature at the current moment In the first adjustment range Inside, at this time , the absolute value of the temperature difference at the current moment is , the absolute value of the temperature difference at the last moment is , is the detected temperature at the last moment, and ,show , so the temperature of the medium outlet 5 tends to decrease, and there is a risk of exceeding the allowable temperature error. Therefore, when the temperature difference between the current temperature and the target temperature has not exceeded the allowable temperature error, the power of the coil 1 is adjusted in time to improve the temperature control accuracy;

[0101] If the absolute value of the temperature difference at the current moment is less than or equal to the absolute value of the temperature difference at the previous moment, it indicates that the error between the current temperature of the medium at the medium outlet 5 and the target temperature changes over time and is within the controllable range. There is no risk of temporarily exceeding the allowable temperature error, and therefore, there is no need to control the coil 1.

[0102] Through the above method, the temperature of the medium at the medium outlet 5 can be detected and judged, and the power of the coil 1 can be controlled, thereby ensuring the stability and accuracy of the temperature of the medium discharged from the medium outlet 5.

[0103] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0104] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0105] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and implementation modes. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the present invention, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A CO2 gas electromagnetic heating element, characterized in that: include: A coil (1) and a heating body (3) disposed in a housing (2); when the coil (1) is energized, the heating body (3) in the coil (1) generates heat; at least one medium flow channel is disposed in the heating body (3); and a medium inlet (4) and a medium outlet (5) in communication with the medium flow channel are disposed on the housing (2); The medium flow channel is a combination of a first flow channel (7) and a second flow channel (8), and the first flow channel (7) is arranged outside the second flow channel (8); At least one end of the heating body (3) is provided with a first cavity (31) communicating with the first flow channel (7), and a second cavity (32) communicating with the second flow channel (8); the first cavity (31) and the second cavity (32) arranged near the medium inlet (4) are respectively provided with a first through hole (311) and a second through hole (321); A sealing plate (10) is further provided on the outer side of the end of the heating body (3), and two groups of communication holes (11) are provided on the sealing plate (10), wherein one group of communication holes (11) can simultaneously make the first through hole (311) and the second through hole (321) in an open state, and the other group of communication holes (11) can make one of the first through hole (311) and the second through hole (321) in an open state and the other in a closed state; The second flow channel (8) comprises: a plurality of flow channel layers arranged along the flow direction of the medium and connected in sequence, the plurality of flow channel layers being arranged in communication with each other; a plurality of communication ports (91) are arranged on two opposite sides of the flow channel layers, respectively, the communication ports (91) on the two sides being arranged in a staggered manner; two adjacent flow channel layers are connected via the communication ports (91); the communication ports (91) of the two flow channel layers located at both ends of the second flow channel (8) are respectively connected to the medium inlet (4) and the medium outlet (5); The flow channel layer comprises: a plurality of interconnected dispersion units (9), wherein the dispersion units (9) are provided with a connecting port (91) and at least three dispersion ports (92) which are interconnected; among the plurality of dispersion units (9) in the same flow channel layer, the connecting ports (91) of a portion of the dispersion units (9) face a first direction, and a first installation space (15) is formed between adjacent dispersion units (9), and the connecting ports (91) of another portion of the dispersion units (9) face a second direction, and a second installation space (16) is formed between adjacent dispersion units (9), and the first direction and the second direction are arranged oppositely; in the same flow channel layer, the dispersion ports (92) of the dispersion units (9) whose connecting ports (91) face the first direction are connected to the dispersion ports (92) of the dispersion units (9) whose connecting ports (91) face the second direction; The first cavity (31) near the medium outlet (5) is connected to the dispersion port (92) of the flow channel layer at the end through the plurality of third through holes (14), so that the medium discharged from the first flow channel (7) first enters the first cavity (31) and then enters the plurality of dispersion ports (92) of the flow channel layer through the plurality of third through holes (14).

2. The electromagnetic heating element for CO2 gas according to claim 1, characterized in that: Temperature sensors (13) are provided at the medium inlet (4) and the medium outlet (5), and the temperature sensors (13) are used to detect the temperature of the medium before heating and the temperature of the medium after heating.

3. The electromagnetic heating element for CO2 gas according to claim 1, characterized in that: A heat insulation layer (6) is provided on the outer side of the shell (2).

4. The electromagnetic heating element for CO2 gas according to claim 1, characterized in that: A perforated plate (22) is provided on the end cover (21) of the shell (2) on a side close to the heating body (3), a gathering cavity (23) is formed between the perforated plate (22) and the heating body (3), and a guide hole (24) is provided on a side of the perforated plate (22) away from the heating body (3), the guide hole (24) being in communication with a medium inlet (4) or a medium outlet (5).

5. The electromagnetic heating element for CO2 gas according to claim 1, characterized in that: The first flow channel (7) is a spiral flow channel.

6. A control method for an electromagnetic heating element, applied to the electromagnetic heating element for CO2 gas according to any one of claims 1 to 5, characterized in that: include: According to the target temperature of the medium required at the medium outlet (5) and the allowable temperature error corresponding to the target temperature, a temperature adjustment range and a temperature stabilization range are obtained; Real-time acquisition of the current temperature at the medium outlet (5); If the current temperature is within the temperature adjustment range, the absolute value of the temperature difference between the current temperature and the target temperature is obtained; If the absolute value of the temperature difference at the current moment is greater than the absolute value of the temperature difference at the previous moment, the coil (1) is controlled according to the temperature difference corresponding to the absolute value of the temperature difference at the current moment, so as to control the heating temperature of the heating body (3).

7. The control method of the electromagnetic heating element according to claim 6, characterized in that: According to the target temperature of the medium required at the medium outlet (5) and the allowable temperature error corresponding to the target temperature, the temperature adjustment range and the temperature stabilization range are obtained, including: According to the target temperature and the allowable temperature error, obtain the minimum temperature value of the temperature adjustment range and maximum temperature ; Determine the minimum temperature value of the temperature stability range according to the set ratio of the allowable temperature error and maximum temperature ; The temperature adjustment interval includes: a first adjustment interval and a second adjustment interval; The first adjustment interval obtained is , the second adjustment interval is The temperature stability range is .

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