CN112503757A - Liquid heat exchange system in container with metal ceramic heating body - Google Patents
Liquid heat exchange system in container with metal ceramic heating body Download PDFInfo
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- CN112503757A CN112503757A CN202011411810.8A CN202011411810A CN112503757A CN 112503757 A CN112503757 A CN 112503757A CN 202011411810 A CN202011411810 A CN 202011411810A CN 112503757 A CN112503757 A CN 112503757A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
- F24H1/10—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium
- F24H1/101—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium using electric energy supply
- F24H1/102—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium using electric energy supply with resistance
- F24H1/103—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium using electric energy supply with resistance with bare resistances in direct contact with the fluid
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/18—Arrangement or mounting of grates or heating means
- F24H9/1809—Arrangement or mounting of grates or heating means for water heaters
- F24H9/1818—Arrangement or mounting of electric heating means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
- F24H9/2014—Arrangement or mounting of control or safety devices for water heaters using electrical energy supply
- F24H9/2028—Continuous-flow heaters
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- General Engineering & Computer Science (AREA)
- Resistance Heating (AREA)
Abstract
The application relates to a liner liquid heat exchange system with a metal ceramic heating element, which comprises a shell, a liquid temperature sensor and the metal ceramic heating element, wherein the shell is provided with an inner flow cavity for liquid to pass through, the inner flow cavity comprises liquid heating sections which are continuously arranged from low to high, hydrothermal fluid output section and gasification buffer section, the cermet heat-generating body penetrates in the casing and indulges and pass through liquid heating section, liquid heating section divide into temperature rising section and boiling gasification section, the liquid in the temperature rising section increases to eminence temperature by the low place in succession, the temperature of liquid in the boiling gasification section is in the boiling point, the length and the income liquid speed of boiling gasification section are negative correlation, the thickness of steam layer is positive correlation with the length of boiling gasification section in the gasification buffer section, the casing is provided with into the liquid mouth in the bottom of temperature rising section, the casing is provided with the liquid outlet at hydrothermal fluid output section department, liquid temperature sensor is located gasification buffer section. This application has the effect of avoiding the quick evaporation of liquid in the courage to lead to high pressure or the phenomenon that the heat-generating body dryly burns in the courage.
Description
Technical Field
The application relates to the field of rapid heaters, in particular to a liner liquid heat exchange system with a metal ceramic heating body.
Background
The heating element in the existing liquid heat exchanger is divided into two types of metal and nonmetal. The metal heating body is generally arranged in the liner or outside the liner, when the metal heating body is arranged in the liner, scale can be easily deposited in the long-term use process, and a large amount of scale greatly reduces the heat conduction efficiency of the heating body to cause overheating damage. If the heating element is arranged outside the liner, one part of the heating element is in direct contact with the air, so that one part of heat energy is dispersed into the air, and the energy utilization rate is relatively low. The nonmetal heating element is generally arranged outside the liner, and similarly, the energy utilization rate is relatively low, so that the nonmetal heating element is not suitable for quickly heating liquid.
MCH refers to a ceramic heating element which is formed by printing metal tungsten or molybdenum manganese slurry on a ceramic tape-casting blank, laminating through hot pressing, and sintering ceramic and metal together under the protection of hydrogen atmosphere at 1600 ℃, has the functions of metal and nonmetal, can be placed in a liner for heating, and is not easy to scale. However, the MCH heating element has a very fast heating rate and strong thermal inertia, and experiments show that the specific heat capacities of normal temperature water and boiling water are close to 4210J/kg ℃., the specific heat capacity of the cermet is 7790.1J/kg &at22 ℃, 11482.2J/kg &at427 ℃, and 12239.9J/kg &at727 ℃, and obviously, at high temperature, the specific heat of the cermet is several times that of water, the heat in the cermet heating element continues to diffuse to the surface after power off, so that the surface temperature of the MCH cermet heating element continues to rise, and according to experimental data, the power off is performed when the surface temperature of the heating element is 100 ℃, and the surface temperature is at most 200 ℃; the power is cut off when the surface temperature is 200 ℃, and the surface temperature can be raised to about 350 ℃ at most.
Therefore, it is difficult for the MCH cermet heating element to control the temperature by controlling the magnitude of the heating element current. Alternatively, the temperature of the MCH can be adjusted by adjusting the water flow speed, and when the water flow speed is increased, the heat exchange efficiency of the water flow and the MCH metal ceramic heating body is increased. However, the inventor finds that when stagnation occurs in the liner or the water flow speed becomes slow, liquid in the liner can be quickly heated and boiled to cause high pressure in the liner or the risk of dry burning of an MCH heating element, and the potential safety hazard is great, so that MCH metal ceramic is difficult to popularize on a liquid heat exchanger.
Disclosure of Invention
In order to avoid the phenomenon that the liquid in the liner is rapidly evaporated to cause high pressure in the liner or dry burning of an MCH heating element, the application provides a liner liquid heat exchange system with a metal ceramic heating element.
The application provides a liquid heat exchange system in courage with cermet heat-generating body adopts following technical scheme:
the utility model provides a liquid heat exchange system in courage with cermet heat-generating body, includes the casing, is used for detecting liquid temperature sensor and the cermet heat-generating body of liquid temperature, the casing is equipped with the inner flow chamber that supplies liquid to pass through, the inner flow chamber includes by low liquid heating section, hydrothermal output section and the gasification buffer segment that is used for holding steam that sets up to high in succession, the cermet heat-generating body penetrates in the casing and indulges the liquid heating section, the liquid heating section divide into temperature rising section and boiling gasification section, the liquid in the temperature rising section is by low department to eminence temperature increase in succession, the temperature of liquid is in the boiling gasification section is in the boiling point, the length of boiling gasification section is negative correlation with income liquid speed, the thickness on steam layer is positive correlation with the length of boiling gasification section in the gasification buffer segment, the casing is provided with into the liquid mouth in the bottom of temperature rising section, the shell is provided with a liquid outlet at the hot liquid output section, and the liquid temperature sensor is positioned in the gasification buffer section.
Through adopting above-mentioned technical scheme, when liquid enters into the inner flow chamber from going into the liquid mouth, will get into liquid heating section earlier, because go into the low level setting of liquid mouth, the high level setting of liquid outlet, therefore liquid through going into the liquid mouth when getting into liquid heating section, will be preferentially full of the bottom of liquid heating section to slowly rise, compare in the structure of going into the high level setting of liquid mouth, the low level setting of liquid outlet, the liquid stream can contact with the cermet heat-generating body more fully. Since the metal ceramic heating body is longitudinally arranged in the liquid heating section, namely, referring to fig. 1, the liquid heating section is a temperature rising section at the beginning, referring to fig. 2, until the liquid at the top of the liquid heating section is boiled, the boiling gasification section does not appear.
For a metal heating body, an electrochemical energy field capable of scaling exists on a solid-liquid section, namely an even electric field, the even electric field is formed by two different substances which are in opposite contact and have different electrode potentials, and the influence on the positive and negative potential of the wall of a pipeline and equipment of a water system, the property of a material of a receptor wall and the environment condition of the receptor wall is exerted; the potential of water is affected by the potential of the walls, the temperature of the water and the amount of ionic charge in the water. The larger the potential difference is, the larger the potential difference of the coupling layer is, the larger the energy of the coupling layer energy field is, and the negative electrode potential is always formed on one side of the wall, so that the scale is formed when mineral solute ions are adsorbed. As can be seen from the electrical signs of the calcium ion and carbonate ion examples, when these charged ions or ion clusters enter the attraction range of the coupling layer under the driving of water flow or thermal diffusion, the narrow distance (10-60 nm) of the coupling layer and the relatively high potential difference [ (0.01-0.1) + X ] V and the charge surface density of about 0.2V/cubic meter will make the positive and negative ions opposite at the coupling layer and make the electrons of the positive-going ions give up to an adjacent negative-going ion (or molecule), and then they will be arranged into a crystal and gradually form a crystal scale layer. Thus, fouling is primarily due to the presence of an electrochemical energy field in the water formed by charged mineral solute ions and the potential difference of the charged layer potential. The heat conductivity coefficient of the scale is about 4% -5% of that of stainless steel, when the scale is too thick, the heat of the metal heating body is difficult to timely transfer to water, and the metal heating body is easily damaged due to overheating.
For the metal ceramic heating body formed by sintering ceramic and metal together, the contact surface of the metal ceramic heating body and liquid is made of non-metal materials, and the potential difference of an even electric field on the solid-liquid section is small, so that the scaling capacity is weak, a good cleaning degree can be kept in the long-term use process, the heat dissipation effect is good, and frequent cleaning is not needed.
In addition, for the metal heating body, the surface of the metal heating body is smooth and compact, metal atoms are mutually connected by utilizing metal bonds to form a uniform heat dissipation surface, and liquid can form uniform temperature gradient in the direction departing from the metal surface, so that good convection is generated, and uniform heating of the liquid is realized. However, for the metal ceramic heating element, the surface of the ceramic has a large number of pores in a microscopic view, so that the specific surface area of the ceramic is far larger than that of the metal heating element (which is also the reason that the ceramic is commonly used for a filter), and since the liquid is surrounded by the ceramic structure after entering the pores, the liquid is subjected to heat exchange with the ceramic, and the temperature is rapidly raised. However, since these liquid molecules are located in the holes and are difficult to form good convection with the external liquid flow, the heat exchange rate and exchange rate of the liquid molecules inside and outside the holes can only be increased by increasing the flow rate of the liquid flow outside the holes. When the liquid flow speed outside the holes is slow or stagnation occurs, the liquid in the holes quickly boils due to quick heat absorption and untimely heat exchange, and is quickly gasified on the surface of the metal ceramic heating body, so that a large amount of steam is generated. Excessive steam not only can make casing internal pressure too big, when the liquid outlet was closed, still can go into the liquid mouth with the liquid backward flow in internal flow chamber for internal flow chamber liquid level reduces, further aggravates the dry combustion method of ceramic metal heating member in the internal flow chamber.
In this scheme, be provided with the gasification buffering section in the eminence of inner current chamber, the cermet heat-generating body does not extend to in the gasification buffering section, that is to say, when steam production and when gasification buffering section is not yet full of by steam, the cermet heat-generating body still is soaked in liquid, and liquid still can play the radiating effect to the cermet heat-generating body, and this has just left sufficient buffering time for the temperature measurement and the measurement of liquid temperature sensor to the cermet heat-generating body. Because the liquid temperature sensor sets up in the gasification buffer segment, when the temperature that surveys exceeded the boiling point of liquid, the system can control into the liquid mouth and accelerate the feed liquor, perhaps carries out power-off protection to the cermet heat-generating body.
On the other hand, because the liquid outlet is arranged between the liquid heating section and the gasification buffer section, when the liquid flow velocity fluctuates to generate steam for a short time, the steam can be stored in the gasification buffer section and cannot be sprayed out of the liquid outlet to cause the risk of sputtering of steam-carried liquid drops. After the velocity of the liquid flow has stabilized, the vapor in the gas buffer section will be absorbed by the liquid flow. In a related heating device such as a boiler, a pressure release valve is generally used for processing generated steam, and when the steam in the boiler reaches a certain pressure, the pressure release valve can discharge the steam, so that danger caused by overhigh internal pressure is avoided. However, the ceramic metal heating body used in the scheme is a ceramic metal heating body, and for ceramics, the internal microstructure of the ceramics is destructive through cyclic pressurization and pressure relief, and the ceramic material is not affected at all when being damaged and can be broken instantly, so that the service life of the metal ceramic heating body is shortened due to cyclic pressurization and pressure relief by arranging the pressure relief valve on the shell. Therefore, the gasification buffer section arranged in the shell can enable the pressure in the shell to change smoothly, and the danger is low. Simultaneously, contain a large amount of heat energy in the steam that produces, if adopt the relief valve scheme, not only need the device extra processing in order to avoid taking place the condition of hindering the people with its discharge back, also can cause the loss of heat energy simultaneously. The steam generated in the scheme can finally return to the liquid flow, and the full utilization of materials and energy is ensured. In addition, when the steam that produces inside the steam buffer section is too much and makes the liquid level be less than the liquid outlet, steam will be discharged from the liquid outlet to as last means, avoid the liquid level to be less than the liquid outlet and lead to the cermet heat-generating body to take place dry combustion method.
In addition, reference is made to fig. 3 and 4, wherein the liquid inlet speed of the liquid inlet in fig. 3 is higher than the liquid inlet speed of the liquid inlet in fig. 4. The metal ceramic heating body is longitudinally arranged in the liquid heating section, so the temperature rising direction is the same as the water flow direction, the temperature of the liquid in the temperature rising section is continuously increased from a low position to a high position and is lower than the boiling point, if a boiling gasification section is present, the liquid in the boiling gasification section is positioned at the heating tail end, only a hot liquid output section and a gasification buffer section are arranged above the liquid, and the hot liquid output section and the gasification buffer section are relatively narrower than the temperature rising section. That is to say, most of the liquid in the liquid heating section is below the boiling point, and the liquid in the hot liquid output section and the gasification buffer section does not absorb heat although being at the boiling point, so boiling gasification does not occur, and therefore, only the liquid in the boiling gasification section can be boiled and gasified, and the boiling gasification section is close to the liquid outlet, so the boiling liquid can rapidly leave the boiling gasification section under the push of the liquid flow and is rapidly discharged from the liquid outlet.
At present, many liquid heating devices, such as a hot water kettle, adopt bottom heating, so that liquid in the kettle can be heated up together until boiling, at the moment, the bottom liquid is quickly gasified and generates a large amount of steam, and because the distance from the steam to the liquid surface is long, steam bubbles accelerate in the floating process, and when the steam bubbles reach the liquid surface, the liquid surface can be quickly pushed, so that the liquid surface shakes violently. In the scheme, the boiling liquid is generated near the liquid outlet, so that the distance from the rising of the bubbles to the liquid level of the gasification buffer section is short, the pushing force of the bubbles to the liquid level is not large when the bubbles float to the liquid level, and the liquid level is relatively gentle. There is no heating body in the hydrothermal liquid output section and the gasification buffer section, so the liquid in the hydrothermal liquid output section and the gasification buffer section will not boil continuously to generate bubbles. Because the liquid level is kept relatively stable, the gasification buffer section can better contain steam or allow the liquid to absorb the steam. If the liquid level shakes violently, the gasification buffer section, the hot liquid output section and even the boiling gasification section are in a turbulent state, even a chaotic state of gas-liquid mixing occurs, so that a large amount of steam can be mixed when liquid is output, danger is caused to people, and the gasification buffer section loses significance.
To sum up, through the structure setting and the position cooperation of each part, reached and avoided courage inner liquid rapid evaporation to lead to courage inner high pressure, steady output hot water and prevent the effect of cermet heat-generating body dry combustion method phenomenon.
Preferably, an over-temperature detection area is arranged in the liquid heating section, a non-porous heat transfer part is arranged on the over-temperature detection area of the shell, the non-porous heat transfer part is in thermal contact with the metal ceramic heating body, a temperature switch is arranged at the non-porous heat transfer part on the outer side of the shell, and the temperature switch controls the metal ceramic heating body to be powered on or powered off based on the relative size of the temperature of the non-porous heat transfer part and a temperature threshold value.
Through adopting above-mentioned technical scheme, cermet heat-generating body and sclausura heat transfer portion direct contact, on the sclausura heat transfer portion was conducted fast to the heat of cermet heat-generating body, temperature switch can carry out the quick response to the change of temperature. Because the temperature switch is arranged on the power supply circuit of the metal ceramic heating element, when the metal ceramic heating element is overheated and exceeds a temperature threshold value due to the conditions of stagnation and the like, the temperature switch can be quickly powered off so as to avoid danger caused by quick liquid gasification or dry burning of the metal ceramic heating element.
For the conventional liquid heater, a hole is usually punched on the shell and a thermocouple is inserted to detect the temperature of the heating element, but the liquid in the inner flow cavity has certain pressure due to the existence of the steam layer in the gasification buffer section, a corresponding sealing element needs to be added when the hole is punched on the shell wall, and the sealing element needs to have the property of resisting high temperature. Thus, by avoiding the perforation of the housing, the pressure resistance and stability of the housing are improved.
Preferably, the cermet heating element is divided into a heating section and an overheating buffering section which are connected with each other, a penetrating through hole is formed in one end of the liquid heating section of the shell, the overheating buffering section penetrates through the penetrating through hole and is connected with a power supply device, a sealing element for connecting the shell and the overheating buffering section is arranged in the penetrating through hole, and the inner flow cavity is isolated from the outside by the sealing element.
By adopting the technical scheme, the temperature of the heating section of the metal ceramic heating element is high and is usually kept at about seven hundred degrees in a system with normal water, so that the connection part of the heating section of the metal ceramic heating element and the shell needs to be provided with heat insulation. The overheating buffer section is made of a material with high heat resistance, and a heating circuit is not arranged in the overheating buffer section, so that the overheating buffer section can only passively absorb heat generated by the heating section. The position of the overheating buffer section is opposite to the water inlet, and the heat transferred to the overheating buffer section can be rapidly taken away by the rapid low-temperature liquid flow flowing in from the water inlet, so that the overheating buffer section keeps a lower temperature, and the phenomenon that the sealing piece is damaged to influence the liquid tightness and the pressure resistance of the shell is avoided.
Preferably, the cermet heating element is a solid cylindrical object.
Preferably, the metal ceramic heating element is a tube body with a single end open, the metal ceramic heating element divides the liquid heating section into an inner heating flow channel and an outer heating flow channel, and a flow guide hole communicating the inner heating flow channel with the outer heating flow channel is formed in the side wall of the metal ceramic heating element, which is far away from the liquid inlet.
By adopting the technical scheme, the inner side surface and the outer side surface of the metal ceramic heating body form two heating surfaces, so that the heat exchange area of the metal ceramic heating body is increased, the liquid is divided into the inner part and the outer part, the heat exchange speed of the metal ceramic heating body is accelerated, the liquid is heated more quickly, and the risk of steam generation is reduced.
Preferably, the liquid inlet speed of the liquid inlet is increased when the temperature measured by the liquid temperature sensor is higher than a preset adjustable temperature, and the liquid inlet speed of the liquid inlet is decreased when the temperature measured by the liquid temperature sensor is lower than the preset adjustable temperature.
By adopting the technical scheme, when the liquid temperature at the liquid outlet detected by the liquid temperature sensor is higher than the temperature corresponding to the liquid outlet temperature gear of the liquid heat exchange system, the liquid inlet speed of the liquid inlet is increased, so that the liquid outlet temperature returns to the temperature corresponding to the liquid outlet temperature gear of the liquid heat exchange system. When the liquid temperature at the liquid outlet detected by the liquid temperature sensor is lower than the temperature corresponding to the liquid outlet temperature gear of the liquid heat exchange system, the liquid inlet speed of the liquid inlet is slowed down, so that the liquid outlet temperature returns to the temperature corresponding to the liquid outlet temperature gear of the liquid heat exchange system.
Preferably, the inner wall of wearing out the through-hole is provided with annular bead, the cylindrical cock body of sealing member for having sealed annular, overheated buffering section passes and with sealing member interference fit from the sealing member, the sealing member install in wearing out the through-hole in and with wear out through-hole interference fit, annular bead joint is in sealed annular.
By adopting the technical scheme, the sealing element is in close contact with the metal ceramic heating element, the hole wall penetrating out of the through hole and the sealing element through interference fit, and stronger friction force and sealing property are generated. Meanwhile, when the hydraulic pressure in the inner flow cavity is large, the annular convex edge is abutted against the groove wall of the sealing ring groove, so that the liquid tightness is improved.
Preferably, the joint between the sealing element and the through hole is filled with epoxy resin glue.
Drawings
FIG. 1 is a state diagram of the internal flow chamber layered as it fills with liquid and begins to heat in the present application;
FIG. 2 is a state diagram of the inner flow chamber stratification during normal hot fluid discharge after a period of fluid heating in accordance with the present application;
FIG. 3 is a state diagram of the inner flow chamber stratification at higher liquid entry rates for the present application;
FIG. 4 is a state diagram of the inner flow chamber stratification at low liquid entry rates for the present application;
FIG. 5 is a schematic structural diagram of a liquid heat exchange system in a liner with a cermet heating element in an embodiment of the present application;
fig. 6 is an enlarged view at a in fig. 5.
Description of reference numerals:
1. a housing; 10. an internal flow cavity; 11. a liquid heating section; 111. a temperature rise section; 112. a boiling gasification section; 12. a hot liquid output section; 13. a gasification buffer section; 14. a liquid inlet; 15. a liquid outlet; 16. an over-temperature detection zone; 17. a non-porous heat transfer portion; 18. penetrating out of the through hole; 19. an annular rib;
2. a liquid temperature sensor;
3. a cermet heating element; 31. a heating section; 32. an overheat buffering section; 33. an internal heating flow channel; 34. adding a hot runner; 35. a flow guide hole;
5. a temperature switch; 6. a seal member; 61. and a sealing ring groove.
Detailed Description
The present application is described in further detail below with reference to figures 1-6.
The embodiment of the application discloses an in-liner liquid heat exchange system with a metal ceramic heating body. Referring to fig. 5, the in-tank liquid heat exchange system includes a case 1 having an internal flow chamber 10, a liquid temperature sensor 2 for detecting the temperature of the liquid in the internal flow chamber 10, and a power-rated cermet heating element 3.
The housing 1 is made of a ceramic material, and may have a square block shape, a cylindrical shape or other shapes, and in this embodiment, the housing 1 is entirely cylindrical and vertically disposed. The bottom end face of the shell 1 is provided with a through hole 18 for the cermet heating element 3 to pass through, in this embodiment, the through hole 18 is a circular hole, and the through hole 18 is coaxially arranged with the shell 1.
The metal ceramic heating body 3 comprises a heat conduction layer and a heating circuit arranged in the heat conduction layer, wherein the heating circuit is formed by printing high-melting-point metal heating resistance slurry such as tungsten, molybdenum, manganese and the like on 92-96% of alumina casting ceramic green bodies and laminating the green bodies in a multilayer manner through 4-8% of sintering aids, and the heat conduction layer is usually alumina ceramic which is co-fired with the heating circuit into a whole at the high temperature of 1500-1600 ℃. The cermet heating element 3 may be a solid cylinder, a square bar, a square tube, a multi-parallel column, a multi-parallel plate, etc. in different embodiments, but it is sufficient that there is a continuous and gentle heating surface with a large area in the liquid flow direction, and in this embodiment, the cermet heating element 3 is a hollow round tube with an opening at one end, and is divided into a heating section 31 and an overheating buffer section 32 connected to each other. The heating section 31 is provided with a heating circuit therein, the overheating buffer section 32 is not provided with a heating circuit therein, and the heat conductivity coefficient of the heat conducting layer of the overheating buffer section 32 is lower than that of the heat conducting layer in the heating section 31. The overheating buffer section 32 penetrates through the through hole 18 and is connected with the power supply device, a sealing member 6 for connecting the shell 1 and the overheating buffer section 32 is arranged in the through hole 18, and the internal current cavity 10 is isolated from the outside by the sealing member 6. In this embodiment, the sealing member 6 is a cylindrical silica plug, and the thermal buffer section 32 passes through two end faces of the sealing member 6 and is in interference fit with the sealing member 6. The sealing member 6 is mounted in the through-hole 18 and is in interference fit with the through-hole 18. Specifically, referring to fig. 6, an annular rib 19 is disposed on the inner wall penetrating through the through hole 18, a sealing ring groove 61 is disposed on the side wall of the sealing member 6, and the annular rib 19 is engaged with the sealing ring groove 61. Optionally, the joint between the sealing element 6 and the through hole 18 may be filled with a glue to further improve the liquid tightness of the housing, in this embodiment, the glue is a food-grade epoxy glue.
The shape of the internal flow chamber 10 may also be a square block, a cylinder or other shapes, and in this embodiment, the internal flow chamber 10 is a cylindrical chamber coaxially arranged with the housing 1. The lower part of the inner flow cavity 10 is provided with a liquid inlet 14, the higher part is provided with a liquid outlet 15, and the inner flow cavity 10 forms a one-way flow passage from low to high between the liquid inlet 14 and the liquid outlet 15. In this embodiment, the inner flow cavity 10 is divided into several continuous sections from low to high, which are a liquid heating section 11, a hot liquid output section 12 and a gasification buffer section 13 that are arranged continuously. The metal ceramic heating element 3 longitudinally penetrates through the liquid heating section 11, and the top end of the liquid heating section 11 is flush with the top end of the metal ceramic heating element 3.
The liquid heating section 11 is divided into a temperature rising section 111 and a boiling and vaporizing section 112, the temperature of the liquid in the temperature rising section 111 is continuously increased from a low position to a high position, and the temperature of the liquid in the boiling and vaporizing section 112 is at a boiling point. The lengths of the temperature rising section 111 and the boiling gasification section 112 are changed in real time and are related to the liquid inlet speed, wherein the length of the boiling gasification section 112 is in negative correlation with the liquid inlet speed, the length of the temperature rising section 111 is in positive correlation with the liquid inlet speed, and the thickness of the steam layer in the gasification buffer section 13 is in positive correlation with the width of the boiling gasification section 112. Specifically, the through hole 18 is communicated with the bottom of the liquid heating section 11, the liquid inlet 14 is disposed at the bottom of the temperature rising section 111 of the casing 1, and the overheat buffering section 32 is disposed at the bottom of the temperature rising section 111 and is opposite to the liquid inlet 14. The liquid outlet 15 is arranged at the position of the shell 1 at the hot liquid output section 12, and the liquid temperature sensor 2 is arranged at the position of the shell 1 at the gasification buffer section 13.
Since the temperature rise direction is the same as the water flow direction, the temperature of the liquid in the temperature rising section 111 continuously increases from the low position to the high position until the boiling point is reached. For the boiling gasification stage 112, the liquid in the boiling gasification stage 112 is located at the heating end, and only the hot liquid output stage 12 and the gasification buffer stage 13 are located above the liquid in the boiling gasification stage 112, and the hot liquid output stage 12 and the gasification buffer stage 13 are relatively narrower than the temperature rise stage 111. That is, most of the liquid in the liquid heating section 11 is below the boiling point, and the liquid in the hot liquid output section 12 and the gasification buffer section 13 does not absorb heat although it is at the boiling point, so that boiling gasification does not occur, and therefore, only the liquid in the boiling gasification section 112 can be boiled gasification, and the boiling gasification section 112 is close to the liquid outlet 15, so that the boiling liquid can rapidly leave the boiling gasification section 112 under the push of the liquid flow and can be rapidly discharged from the liquid outlet 15. As shown in fig. 3, when the liquid inlet speed is slow, the heating time of the liquid is long, and therefore, the temperature rising section 111 is short, the boiling vaporization section 112 is long, the amount of steam generation is large, and the steam layer in the vaporization buffer section 13 is thick. As shown in fig. 4, when the liquid inlet speed is high, the heating time of the liquid is short, so the temperature rising section 111 is long, the boiling vaporization section 112 is short, the generation of steam is little or not generated, and the steam layer in the vaporization buffer section 13 is thin. In short, when the liquid inlet speed fluctuates, the gasification buffer section 13 has a temporary storage effect on the generated steam, so that the danger caused by gas-liquid mixing during water outlet is avoided. Meanwhile, the pressure inside the inner flow cavity 10 is continuously changed, and the microstructure damage of the metal ceramic heating body 3 caused by the sudden change of the pressure inside the inner flow cavity 10 is avoided.
An over-temperature detection area 16 is arranged in the liquid heating section 11, a non-porous heat transfer part 17 is arranged on the over-temperature detection area 16 of the shell 1, the non-porous heat transfer part 17 is in thermal contact with the metal ceramic heating element 3, and in the embodiment, the non-porous heat transfer part 17 is a part of the shell 1 protruding towards the metal ceramic heating element 3. The outer side of the shell 1 is provided with a temperature switch 5 at the position of the non-porous heat transfer part 17, the temperature switch 5 is arranged on a power supply circuit of the metal ceramic heating body 3 and is used for controlling the power on/off of the metal ceramic heating body 3, and the temperature switch 5 controls the power on/off of the metal ceramic heating body 3 based on the relative size of the temperature of the non-porous heat transfer part 17 and a preset temperature threshold value. In this embodiment, the temperature switch 5 may be a KSD301 temperature switch, a fuse, or another type of temperature switch, as long as the temperature switch 5 can be powered off after the measured temperature exceeds the temperature threshold. For example, when the temperature of the non-porous heat transfer portion 172 exceeds a temperature threshold, the fuse is fused to cause the cermet heating element 3 to be electrically disconnected.
The metal ceramic heating element 3 divides the liquid heating section 11 into an inner heating flow passage 33 and an outer heating flow passage 34, and a flow guide hole 35 communicating the inner heating flow passage 33 and the outer heating flow passage 34 is formed in the side wall of the metal ceramic heating element 3 departing from the liquid inlet 14.
The inlet 14 is usually equipped with a valve for controlling the flow rate of the inlet liquid, and the system is also provided with a controller connected with the liquid temperature sensor 2, so that people can input different parameters into the controller to set different preset adjustable temperatures. When the temperature measured by the liquid temperature sensor 2 is higher than the preset adjustable temperature, the controller controls the valve body to increase the liquid inlet speed of the liquid inlet 14; when the temperature measured by the liquid temperature sensor 2 is lower than the preset adjustable temperature, the controller controls the valve body to reduce the liquid inlet speed of the liquid inlet 14.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (8)
1. The utility model provides a liquid heat exchange system in courage with cermet heat-generating body, a serial communication port, including casing (1), be used for detecting liquid temperature sensor (2) and cermet heat-generating body (3) of liquid temperature, casing (1) is equipped with interior flow chamber (10) that supplies liquid to pass through, interior flow chamber (10) include by low to high liquid heating section (11) that set up in succession, hydrothermal output section (12) and be used for holding gasification buffer section (13) of steam, cermet heat-generating body (3) penetrate casing (1) in and indulge through liquid heating section (11), liquid heating section (11) divide into temperature rise section (111) and boiling gasification section (112), the liquid in temperature rise section (111) is by low to eminence temperature and increases in succession, the temperature of liquid in boiling gasification section (112) is at the boiling point, the length of boiling gasification section (112) is negative correlation with the speed of entering liquid, the thickness of steam layer is positive correlation with the length of boiling gasification section (112) in gasification buffer section (13), casing (1) is provided with into liquid mouth (14) in the bottom of temperature rise section (111), casing (1) is provided with liquid outlet (15) in hydrothermal solution output section (12) department, liquid temperature sensor (2) are located gasification buffer section (13).
2. The liquid heat exchange system with a heating element of metal ceramic in a liner according to claim 1, characterized in that an over-temperature detection area (16) is arranged in the liquid heating section (11), the housing (1) is provided with a non-porous heat transfer portion (17) on the over-temperature detection area (16), the non-porous heat transfer portion (17) is in thermal contact with the heating element of metal ceramic (3), a temperature switch (5) is installed at the non-porous heat transfer portion (17) on the outer side of the housing (1), and the temperature switch (5) controls the power on and off of the heating element of metal ceramic (3) based on the relative size of the temperature of the non-porous heat transfer portion (17) and the temperature threshold value.
3. The heat exchange system for the liquid in the liner with the cermet heating element as set forth in claim 1, wherein the cermet heating element (3) is divided into a heating section (31) and an overheating buffer section (32) connected with each other, the shell (1) is provided with a through hole (18) at one end of the liquid heating section (11), the overheating buffer section (32) passes through the through hole (18) and is connected with a power supply device, a sealing member (6) connecting the shell (1) and the overheating buffer section (32) is provided in the through hole (18), and the sealing member (6) isolates the inner flow chamber (10) from the outside.
4. The liquid heat exchange system with a liner of a cermet heating element as set forth in claim 1, characterized in that the cermet heating element (3) is a tube with a single end open, the cermet heating element (3) divides the liquid heating section (11) into an inner heating flow channel (33) and an outer heating flow channel (34), and a flow guide hole (35) communicating the inner heating flow channel (33) and the outer heating flow channel (34) is opened on the side wall of the cermet heating element (3) away from the liquid inlet (14).
5. The liquid heat exchange system in a liner with a cermet heating element according to claim 1, characterized in that the liquid inlet speed of the liquid inlet (14) is increased when the temperature measured by the liquid temperature sensor (2) is higher than a preset adjustable temperature, and the liquid inlet speed of the liquid inlet (14) is decreased when the temperature measured by the liquid temperature sensor (2) is lower than the preset adjustable temperature.
6. The heat exchange system for liquid in the liner with the cermet heating element as claimed in claim 1, wherein the inner wall of the through hole (18) is provided with an annular rib (19), the sealing member (6) is a cylindrical plug body with a sealing ring groove (61), the sealing member (6) is installed in the through hole (18) and is in interference fit with the through hole (18), and the annular rib (19) is clamped in the sealing ring groove (61).
7. The heat exchange system for liquid in a liner with a metal ceramic heating body according to claim 1, characterized in that the joint of the sealing member (6) and the through hole (18) is filled with epoxy resin glue.
8. The liquid heat exchange system with a cermet heat-generating body in the liner according to claim 1 characterized in that the cermet heat-generating body (3) is a solid cylindrical object.
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| CN202011411810.8A CN112503757B (en) | 2020-12-04 | 2020-12-04 | Liquid heat exchange system in container with metal ceramic heating body |
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| CN202011411810.8A CN112503757B (en) | 2020-12-04 | 2020-12-04 | Liquid heat exchange system in container with metal ceramic heating body |
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Cited By (1)
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|---|---|---|---|---|
| CN114666928A (en) * | 2022-05-02 | 2022-06-24 | 谭晓爽 | MCH metal ceramic heating pipe |
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| CN112503757B (en) | 2021-07-06 |
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