CN109611812B - Steam generator for generating hot water - Google Patents

Abstract

The present invention provides a steam generator. The steam generator includes a box body and an inner tube body. The inner tube body includes an outer tube and a core body arranged in the outer tube. The core body is a square through hole and a regular octagon. The side length of the square through hole is equal to the side length of the regular octagonal through hole, and the four sides of the square through hole are the sides of four different regular octagonal through holes. The four mutually spaced sides of the hole are respectively the sides of four different square through holes; electric heaters are arranged in the square through holes; the hot water outlet is arranged on the side wall of the box body. The invention designs a steam generator with a new structure, which can generate steam and hot water at the same time, and the steam generator has the functions of rapid heating, uniform temperature distribution, safety and reliability, and improves the heating efficiency.

Description

A steam generator that produces hot water

technical field

The invention relates to the technical field of boilers, in particular to a steam generator with a novel structure.

Background technique

A steam generator is a mechanical device that uses the thermal energy of fuel or other energy sources to heat water into steam. The steam generator has a wide range of applications and is widely used in garment factories, dry cleaners, restaurants, steamed buns, canteens, restaurants, factories and mines, soy products factories and other places.

Most of the current steam generators are heated by gas or fuel oil, and the heating efficiency is low. Most of the current electric steam generators use electric heating tubes arranged at the bottom of the water storage tank to directly heat the water in the water storage tank to generate steam. This electric steam generator has the problems of slow heating and low thermal efficiency.

For example, Chinese patent document CN2071061U discloses a steam generator for beauty and health care, including a metal electrode plate, a shell made of heat-resistant plastic, a steam outlet cover, an internal baffle, a movable handle, and a metal electrode plate. It must be connected to the power supply through the power cord. There is an internal baffle in the casing, a steam outlet cover at the upper port, and a socket groove on the outside of the bottom of the casing, which can be connected to the movable handle with a socket. Another example is an improved electric heating steam generator disclosed in Chinese patent document CN2651594Y, which is used to generate steam, and includes a main body cavity and an electric heater. The electric heater is placed in the main body cavity, and the main body cavity The upper and lower parts of the cavity are separated, the upper cavity is a steam cavity, the lower cavity is a heating water cavity, and there are steam holes on the partition; The vent holes on the adjacent partition are dislocated. The electric heater heats the water in the heating water chamber, and the steam enters the steam chamber for standby through the partition plate and the transition chamber formed by it. The electric steam generators disclosed in the above two patent documents belong to this type of product.

The steam generator in the prior art is not uniformly heated, the overall steam generation efficiency is not high, and the heater structure is relatively simple.

SUMMARY OF THE INVENTION

Aiming at the deficiencies in the prior art, the present invention provides a multifunctional steam generator with a novel structure, which can quickly provide steam, and has the functions of rapid heating, uniform temperature distribution, safety and reliability, and improves heating efficiency.

To achieve the above object, the present invention adopts the following technical solutions:

A steam generator, the steam generator comprises a box body, an inner pipe body, a cold water inlet, a hot water outlet and a steam outlet, the cold water inlet is arranged on the side wall of the box body, and the inner pipe body is arranged on the box body Inside the body, the inner tube body includes an outer tube and a core body arranged in the outer tube, the inner tube body is arranged in a vertical direction, and a water inlet channel is arranged at the lower part of the inner tube body to ensure that the water in the box body can enter the inner tube body For heating, the upper part of the inner pipe body is connected to the steam outlet; the core body is arranged on the upper part of the water inlet channel, and the inner pipe body where the core body is located extends in the vertical direction; the core body is a square through hole and a regular octagonal through hole. It is composed of holes, the side length of the square through hole is equal to the side length of the regular octagonal through hole, the four sides of the square through hole are the sides of four different regular octagonal through holes, the The four mutually spaced sides are respectively the sides of four different square through holes; electric heaters are arranged in the square through holes; the hot water outlet is arranged on the side wall of the box body.

Preferably, the cold water inlet is located at the lower part of the box body, and the hot water outlet is located on the side wall of the upper part of the box body.

Preferably, the cross section of the inner tube body is square.

Preferably, the inner wall of the inner tube is provided with a groove, and the outer end of the core body is provided in the groove.

Preferably, the inner tube body is welded with a multi-segment structure, and a core body is provided at the joint of the multi-segment structure.

Preferably, the steam outlet is sealed with the outer pipe of the inner pipe body.

Preferably, the cross-sectional area of the steam outlet pipe is smaller than the cross-sectional area of the outer pipe of the inner pipe body.

Preferably, the inner pipe body is arranged in the middle position of the box body.

Preferably, the water inlet channel is a strip-shaped slit.

Preferably, the water inlet channel is set below 50% of the water level of the tank.

Preferably, the electric heater is a resistance heater.

Preferably, the resistive heater fills the entire square channel.

Preferably, a plurality of the core bodies are arranged along the vertical direction, and a water inlet channel is arranged on the outer pipe between two adjacent core bodies.

Preferably, the farther the center of the square through hole is from the center of the core, the greater the heating power of the resistance heater per unit length in the vertical direction.

Preferably, the farther the center of the square through hole is from the center of the core, the larger the heating power of the resistance heater per unit length in the vertical direction is, the greater the magnitude is, the greater the continuous increase.

Preferably, the center of the core body is a regular octagonal channel, the regular quadrilateral channel is a two-layer structure surrounding the core body, the outermost layer is a regular octagonal channel, and the side length of the outer tube is a square channel with 8 times the length side length.

Preferably, the heating power of each electric heater in the first layer is W1, the heating power of each electric heater in the second layer is W2, the height of the core is H, and the side length of the regular quadrilateral is L, then the following requirements are met:

W2/W1=a-b*LN(H/L); where a, b are parameters, 3.3<a<3.4, 0.90<b<0.95;

1.15<W2/W1<1.75; 5.9<H/L<10.1;

The total heating power of the first layer and the second layer is M, 2500W<M<5500W.

Preferably, a=3.343, b=0.921.

The present invention has the following advantages:

1) The present invention designs a steam generator with a new structure, which can generate steam and hot water at the same time, and the steam generator has the functions of rapid heating, uniform temperature distribution, safety and reliability, and improves the heating efficiency.

2) The present invention further improves the heating uniformity and heating efficiency by setting the variation of the heating power between the electric heater in the inner tube and the center of the core.

3) In the present invention, the vertical distribution of the core body in the inner tube is designed at intervals, and water inlet channels are arranged on the inner tube body at intervals, which can ensure that the water at different positions enters the inner tube for heating in time, which can further improve the heating. efficiency.

4) The present invention designs the variation of the heating power of different electric heaters in the inner tube along the height direction, which can further improve the safety performance and heating performance of the device.

5) The present invention determines the optimal proportional relationship of the electric heating power of different layers through numerical simulation and a large number of experiments, further improves the heating uniformity and heating efficiency, and also provides a design for the inner tube body of this structure. best reference.

6) In the present invention, through numerical simulation and a large number of experiments, the optimal relationship of each size of the core is determined, and the heating uniformity and heating efficiency are further improved.

Description of drawings:

FIG. 1 is a schematic diagram of the preferred structure of the steam generator for generating hot water and steam according to the present invention.

FIG. 2 is a schematic diagram of the preferred structure of the steam generator that only generates steam according to the present invention.

Figure 3 is a schematic view of the cross-sectional structure of the inner tube body (core body).

FIG. 4 is a schematic cross-sectional view of the core body AA in the inner tube of FIG. 3 .

Figure 5 is a schematic view of the longitudinal section of the inner tube body.

In the figure: 1-box body; 2-inner pipe body; 3-cold water inlet; 4-hot water outlet; 5-steam outlet; 6-exhaust outlet;

7-core; 71-regular quadrilateral; 72-regular octagon; 73-side; 8-opening; 9-electric heater

Detailed ways

Figures 1-5 illustrate a steam generator. As shown in FIG. 1 , the steam generator includes a box body 1, an inner pipe body 2, a cold water inlet 3, a hot water outlet 4 and a steam outlet 5. The cold water inlet 3 is arranged at the lower part of the box body 1, and the heat The water outlet 4 is located in the upper part of the tank 1 body. The inner pipe body 2 is arranged in the box, and the inner pipe body 2 is arranged in a vertical direction (perpendicular to the bottom plane of the water tank). The inner pipe body 2 includes an outer pipe and a core body 7 arranged in the outer pipe. The lower part of the pipe body 2 is provided with a water inlet channel 8 to ensure that the water in the box 1 can enter the inner pipe body 2 for heating, and the upper part of the inner pipe body 2 is connected to the steam outlet 5; the core body 7 is arranged on the upper part of the water inlet channel 8, so The core body 7 extends in the vertical direction of the inner tube body 2; the core body 7 is composed of a square through hole 71 and a regular octagonal through hole 72, and the side length of the square through hole is equal to the side of the regular octagonal through hole long, the four sides 73 of the square through hole 71 are respectively the sides of four different regular octagonal through holes 72, and the four mutually spaced sides 73 of the regular octagonal through hole 72 are respectively four different square through holes 72. The side of the hole 71; the electric heater 9 is arranged in the square through hole 71.

In the present invention, a steam generator with a new heating structure is arranged, and the heating structure evenly distributes the electric heaters around a plurality of regular octagonal channels, so that the fluid enters the regular octagonal channels and can be uniformly heated by the electric heaters. With this kind of structure, the steam can be quickly provided by one device, and the steam generator has the functions of rapid heating, uniform temperature distribution, safety and reliability, and the heating efficiency is improved.

Preferably, the steam outlet 5 pipeline is sealed with the outer pipe of the inner pipe body 2 .

Preferably, the cross-sectional area of the pipe of the steam outlet 5 is smaller than the cross-sectional area of the outer pipe of the inner pipe body 2 . This can ensure the steam discharge speed.

Cold water enters the tank through the cold water inlet 3 . When working, the inner pipe body 2 is arranged in the box body 1, the water in the box body 1 enters the inner pipe body 2 through the water inlet channel 8 on the outer pipe, and then the water passes through the inner pipe body in the regular octagonal through hole. The electric heater in the regular quadrilateral through hole of the core body 7 in 2 is heated, and the steam generated after heating is discharged through the steam outlet 5 . At the same time, the inner pipe body heats the water in the box while generating steam, and the hot water generated after heating can be used through the hot water outlet.

Preferably, the regular quadrilateral through holes are closed up and down, and water cannot enter.

Through the above-mentioned structural arrangement, steam and hot water can be generated at the same time, so that the steam generator has multiple functions, and the scope of its utilization is expanded, and the generated steam is directly discharged through the steam outlet connected to the inner pipe body, because the steam generator is discharged through the outer pipe body. The tube is used to heat the water outside the inner tube body, so the external water will not boil and evaporate, which also ensures the safety of heating.

In the present invention, the inner pipe body 2 is arranged in the vertical direction, so that the water can be heated in the vertical direction, so that the water is continuously heated during the rising process, and the heating efficiency is further improved compared with the inner pipe body arranged in the horizontal direction.

Preferably, the outer tube of the inner tube body is the outer wall surface of the core body. Preferably, the inner tube body and the core body are integrally manufactured.

As an improvement, the hot water outlet 4 can be eliminated, eg, as shown in Figure 2, and only the steam generator is used as a single-function evaporator that produces steam.

Preferably, the upper part of the box body 1 is provided with an exhaust port 6 . By arranging the exhaust port 6, the pressure inside the box body 1 is prevented from being too large, and safety can be ensured.

Preferably, the cross section of the box body 1 is circular.

Preferably, the cross section of the inner tube body 2 is square.

Preferably, the inner pipe body 2 is arranged in the middle position of the box body 1 . By setting in this way, the uniformity of hot water heating is ensured.

Preferably, the side length of the cross-sectional area of the outer tube of the inner tube body 2 is 0.01-0.15 times the cross-sectional area of the box body 1 . More preferably, it is 0.11-0.13 times.

Preferably, the water inlet channel 8 is a strip slit.

Preferably, the water inlet channel 8 is an opening. As shown in Figure 5. It should be noted that FIG. 5 is only a schematic diagram. Although FIG. 5 only shows one or one row of openings, it is not limited to one or one row. Set up multiple or multiple rows at the upper and lower positions of the space.

Preferably, the shape of the opening may be circular or square.

Preferably, the opening is set below 50% of the water level of the tank body 1 . By setting in this way, it can be ensured that water can enter the inner pipe body 2 for heating in a timely manner, and at the same time, it is also avoided that the setting of the opening is too high to cause the steam to overflow from the opening, and the pressure in the whole box is prevented from being too high, and the water at the high place is also avoided. Into the inner tube body, causing the steam produced to carry too much moisture.

Preferably, the wire connecting the electric heater 9 enters through the water inlet channel.

Preferably, the wire connecting the electric heater 9 enters the inner tube body 2 through the bottom of the inner tube body 2 .

Preferably, the inner wall of the inner tube body 2 is provided with a groove, and the outer wall surface of the core body 7 is provided in the groove. By setting in this way, the firmness of the core body installation can be further improved.

Preferably, the inner tube body 2 is formed by welding a multi-segment structure, and a core body 7 is provided at the joint of the multi-segment structure. By setting in this way, the processing can be facilitated and the cost can be saved.

Preferably, the electric heater 9 is a resistance heater.

Preferably, the resistive heater 9 fills the entire square channel. This arrangement can ensure that the electric heater is in contact with the wall surface of the square channel, thereby further improving the heating efficiency.

Preferably, a plurality of the core bodies 7 are arranged at intervals along the vertical direction, and a water inlet channel is provided on the outer tube spaced between two adjacent core bodies 7 . The invention designs the vertical distribution of the core bodies in the inner tube body, and sets the water inlet channels on the inner tube bodies at intervals, which can ensure that the water at different positions enters the inner tube for heating in time, and can further improve the heating efficiency .

Preferably, the farther the center of the square through hole is from the center of the core 7, the greater the heating power of the resistance heater per unit length in the vertical direction. For example, in FIG. 3 , the heating power of the first layer is lower than that of the second layer, but the heating power of the second layer is also different. Specifically, the heating power of the four top corners is greater than the heating power of the non-vertical corners. Through vertical simulations and experiments, it is found that the farther from the center, the larger the area involved in heating, the more heating power is required, especially in the outermost layer, because the water outside the inner tube body is also heated, so it is necessary to The heating power per unit length in the vertical direction is greater. The present invention further improves the heating uniformity and heating efficiency by setting the heating power variation between the electric heater in the inner tube and the center of the core.

Preferably, the farther the center of the square through hole is from the center of the core body 7 , the higher the heating power of the resistance heater per unit length in the vertical direction is, the greater the magnitude is, the greater the continuous increase. The above-mentioned changes in the heating amplitude are also obtained through a large number of numerical simulations and experiments, which are not common knowledge in the art. By changing the above range, the heating efficiency and the heating uniformity can be further improved.

Preferably, the core body 7 is a regular octagonal central core body, and the regular octagonal through hole is located in the center of the core body. As shown in Figure 3.

Further preferably, the center of the core body 7 is a regular octagonal channel, the regular quadrilateral channel is a two-layer structure surrounding the core body, the outermost layer is a regular octagonal channel, and the side length of the outer tube is 8 times the regular octagonal channel. The side length of the edge-shaped via.

Through a large number of numerical simulations and experiments, it can be known that the heating power requirements of different layers of electric heaters are different to achieve the purpose of uniform heating. The longer the side of the regular quadrilateral, the larger the volume to be heated and the larger the external space. The larger the heating power ratio of the inner and outer layers is required; and the longer the length of the core body in the vertical direction, the larger the heating area on the overall length, the more uniform the heating distribution, resulting in the heating of the inner and outer layers. The smaller the power ratio requirement. Therefore, the present invention conducts a lot of research on the heating power, side length and height of each layer through a large number of vertical simulations and experiments, and obtains the optimal heating power relationship. For the above-mentioned structure of Figure 3, the ratio of the heating power of the outermost layer to the heating power of the innermost layer meets the following requirements:

Preferably, the heating power of each electric heater in the first layer is W1, the heating power of each electric heater in the second layer is W2, the height of the core is H, and the side length of the regular quadrilateral is L, then the following requirements are met:

W2/W1=a-b*LN(H/L); where a, b are parameters, 3.3<a<3.4, 0.90<b<0.95;

1.15<W2/W1<1.75; 5.9<H/L<10.1;

The total heating power of the first layer and the second layer is M, 2500w<M<5500W.

Preferably, a=3.343, b=0.921.

As a preference, 1.3<W2/W1<1.5; 7.1<H/L<8.1;

The first and second layers are the inner and outer layers, respectively.

Preferably, as H/L increases, a decreases gradually and b increases gradually. By setting in this way, the heating can be made more uniform, and the heating efficiency can be improved.

Preferably, along the vertical direction from bottom to top, the pipe diameter of the inner pipe body 2 is continuously increased. The main reasons are as follows: 1) By increasing the pipe diameter of the inner pipe body 2, the resistance to the upward flow of steam can be reduced, so that the vapor evaporated in the inner pipe body 2 continuously moves in the direction of increasing pipe diameter, thereby further promoting the rise of steam. 2) With the continuous flow of the fluid, the liquid is continuously evaporated in the inner tube body 2, so that the volume of the gas body is getting larger and the pressure is also increasing. Changes in body volume and pressure, so that the overall pressure distribution is uniform.

Preferably, along the vertical direction from the bottom to the top, the diameter of the inner pipe body 2 is continuously increased with an increasing range. The above-mentioned amplitude change of the pipe diameter is the result obtained by the applicant through a large number of experiments and numerical simulations. Through the above-mentioned settings, the steam flow can be further promoted, and the overall pressure can be uniform.

Preferably, a plurality of core bodies 7 are arranged in the inner tube body 2 , and the distance between the core bodies 7 is larger from the bottom end of the inner tube body 2 to the upper end of the inner tube body 2 . Let the distance from the bottom end of the inner tube body 2 be H, the distance between adjacent cores be S, S=F ₁ (H), that is, S is a function of the distance H as a variable, S' is the first derivative of S, Meet the following requirements:

S'>0;

The main reason is to avoid drying out caused by the overheating of the upper steam. By setting the heating power of the lower part to be greater than the heating power of the upper part, the water can be fully heated in the lower part, and the water in the upper part is reheated during the rising process. The water in the upper part evaporates first, which is caused by heating and drying. Therefore, the distance between adjacent cores that need to be arranged is getting shorter and shorter.

Through experiments, it is found that, through the above setting, the overall uniformity of heating can be maintained to the greatest extent, and the heating effect can be improved at the same time.

Further preferably, from the inlet of the inner tube body 2 to the outlet of the inner tube body 2, the distance between the adjacent core bodies is continuously increased to a larger and larger extent. That is, S" is the second derivative of S, which meets the following requirements:

S” > 0;

It has been found through experiments that by setting in this way, the overall uniformity of heating can be further maintained, and the heating effect can be improved at the same time. It should be noted that the above rules are obtained by the applicant through a large number of experiments and numerical simulations, and are not common knowledge or conventional means in the field.

Preferably, a plurality of core bodies are arranged in the inner tube body 2. From the bottom end of the inner tube body 2 to the upper end of the inner tube body 2, the heating power of the electric heaters arranged in each regular quadrilateral of different core bodies gradually decreases . Let the distance from the bottom end of the inner tube body 2 be H, the electric heater power arranged in each regular quadrilateral of the adjacent core body is W, S=F ₃ (H), that is, W is a function of the distance H as a variable, W' is the first derivative of W, which satisfies the following requirements:

W'<0;

The main reason is to avoid drying out caused by the overheating of the upper steam. By setting the heating power of the lower part to be greater than the heating power of the upper part, the water can be fully heated in the lower part, and the water in the upper part is reheated during the rising process. The water in the upper part evaporates first, which is caused by heating and drying. Therefore, the distance between adjacent cores that need to be arranged is getting shorter and shorter.

Through experiments, it is found that, through the above setting, the overall uniformity of heating can be maintained to the greatest extent, and the heating effect can be improved at the same time.

Further preferably, from the inlet of the inner tube body 2 to the outlet of the inner tube body 2, the power of the electric heaters arranged in each regular quadrilateral of the adjacent core bodies decreases continuously and increases continuously. That is, W" is the second derivative of S, which meets the following requirements:

w” > 0;

It has been found through experiments that by setting in this way, the overall uniformity of heating can be further maintained, and the heating effect can be improved at the same time. It should be noted that the above rules are obtained by the applicant through a large number of experiments and numerical simulations, and are not common knowledge or conventional means in the field.

Preferably, a plurality of core bodies are arranged in the inner tube body 2 , and from the bottom end of the inner tube body 2 to the upper end of the inner tube body 2 , the side length of the square becomes smaller and smaller. The distance from the entrance of the inner pipe body 2 is H, the side length of the square is C, C=F ₂ (H), and C' is the first derivative of C, which meets the following requirements:

C'<0;

The main reason is because the smaller the side of the square, the more difficult it is to manufacture, but the better the overall heating uniformity. Because the further to the upper part, the overall heating of the water should be kept uniform to avoid partial drying out caused by uneven heating, and the further to the upper part, because the steam has to go out through the outlet, the more the uniformity of steam outgassing and heating should be strengthened. With the above arrangement, costs can be saved, and the best heating uniformity and steam production efficiency can be achieved, while drying out is avoided.

Further preferably, from the inlet of the inner tube body 2 to the outlet of the inner tube body 2, the side length of the square becomes smaller and smaller and the amplitude is continuously increased. C" is the second derivative of C, which satisfies the following requirements:

C”>0.

Preferably, the distance between adjacent cores remains unchanged.

It has been found through experiments that by setting in this way, the overall uniformity of heating can be further maintained, and the heating effect can be improved at the same time. It should be noted that the above rules are obtained by the applicant through a large number of experiments and numerical simulations, and are not common knowledge or conventional means in the field.

Preferably, the farther the center of the square through hole is from the center of the core, the greater the heating power of the resistance heater per unit length in the vertical direction.

Because it can be known from experiments and numerical simulations that the more outward, the larger the volume that needs to be heated, especially the outermost, which needs to heat the surrounding water and the water in the inner tube. The present invention further improves the heating uniformity and heating efficiency by setting the heating power variation between the electric heater in the inner tube and the center of the core.

Preferably, the farther the square through hole is from the center of the core, the higher the heating power of the resistance heater per unit length in the vertical direction is continuously increasing. Through such regular setting, the heating uniformity and heating efficiency are further improved.

Preferably, the openings are arranged in multiple rows along the height direction (that is, from the bottom to the top, and the height direction that appears below, if there is no special description, refers to the bottom to top direction).

By setting up multiple rows, it can ensure that water enters at different heights, avoid water entering at a single position, resulting in uneven heating, and at the same time prevent the entering water from being evaporated, causing the heating tube to dry up.

Preferably, along the height direction, the distribution density of the openings becomes smaller and smaller. The density of the distribution of openings is getting smaller and smaller, which means that the distribution of openings is less and less, and the area of the openings is also smaller and smaller.

Through a large number of numerical simulations and experimental studies, it is found that the distribution density of the openings is getting smaller and smaller, the main reason is to ensure that most of the water is heated at the bottom, and water continuously enters the inner pipe body 2 when the water turns into steam and rises. , continue heating. If there is less water in the lower part, it may cause the water in the lower part to vaporize rapidly, resulting in excessive pressure in the inner pipe body 2, so that the water in the upper part cannot enter the inner pipe body due to the pressure. The drying of the inner tube body is reduced, and the heating efficiency is improved at the same time.

Further preferably, along the height direction, the distribution density of the openings becomes smaller and smaller and increases continuously.

After a large number of experiments and numerical simulations, through the above-mentioned changes in the distribution density of the openings, the heating efficiency can be further improved, the steam output efficiency can be improved, and the dry-up in the inner tube can be reduced at the same time.

Preferably, along the height direction, the area of a single opening becomes smaller and smaller. Further preferably, along the height direction, the area of a single opening is smaller and smaller and the range is continuously increased. For specific reasons, see the change in the distribution density of open pores.

Preferably, along the height direction, the sum of the areas of the openings in each row becomes smaller and smaller. Preferably, along the height direction, the sum of the areas of the openings in each row becomes smaller and smaller and continuously increases. For specific reasons, see the change in the distribution density of open pores.

Preferably, along the height direction, the spacing between the openings in each row becomes larger and larger. Preferably, along the height direction, the spacing between the openings in each row increases continuously. For specific reasons, see the change in the distribution density of open pores.

Preferably, along the height direction, the heating power per unit length of the electric heating rod 9 is continuously reduced. By setting the heating power of the electric heating rod 9 to be continuously reduced, the fluid in the lower part is rapidly heated, and then the hot fluid flows to the upper part through natural convection, and the fluid in the upper part and the fluid outside the inner tube body 2 in the lower part enter quickly, which can further improve the heating efficiency. After a large number of experiments and numerical simulations, through the above-mentioned changes in the heating power of the inner tube body, the heating efficiency can be further improved by about 10%, and the heating time can be saved.

Preferably, along the height direction, the heating power per unit length of the electric heating rod 9 is continuously reduced and the range is continuously increased.

After a large number of experiments and numerical simulations, through the above-mentioned change of the heating power range of the electric heating rod 9, the heating efficiency can be further improved by 5%, and the heating time can be further saved.

Preferably, the same electric heating rod 9 in the same core is divided into multiple sections, and along the height direction, the heating power per unit length of different sections is different. Among them, along the height direction, the heating power per unit length of different segments is continuously reduced. Further preferably, the magnitude of the reduction is continuously increased.

Preferably, each segment is the same length.

Preferably, the heating power per unit length of each segment is the same.

The specific reasons are as above.

By arranging the segments, it is possible to further simplify and facilitate the manufacture.

Through analysis and experiments, it is known that the distance between the cores in the vertical direction should not be too large. If it is too large, the effect of steam generation will not be good. At the same time, it should not be too small. If it is too small, it will cause the inner tube to dry easily. The side length of the square can not be too large or too small, too large will lead to uneven heating, too small will lead to too dense distribution of regular quadrilaterals and octagons, resulting in increased flow resistance and increased processing costs. Therefore, through a large number of experiments, the present invention optimizes the resistance under the condition of preferentially satisfying the steam output, and sorts out the best relationship of each parameter.

Preferably, the distance between adjacent cores is S1, the side length of the square is L, the core is a square section, and the side length of the square section of the core is B2, which meets the following requirements:

10*L/B2=a-b*(S1/B2);

Where a, b are parameters, where 0.95<a<0.96, 0.158<b<0.165;

90<B2<240mm;

8<L<30mm;

29<S1<110mm.

Further preferably, a=0.956, b=0.163;

Further preferably, as L/B2 increases, a becomes larger and b becomes smaller.

Preferably, the side length L of the square through hole is the average value of the inner side length and the outer side length of the square through hole, and the side length B2 of the square section of the core body is the average value of the inner side length and the outer side length of the square section of the core body.

The distance S1 between adjacent cores is the distance between the opposing faces of the adjacent cores. For example, the distance between the upper end surface of the lower core and the lower end surface of the upper core.

Preferably, as B2 increases, L also increases. But with the increase of B2, the continuous increase of L becomes smaller and smaller. The change of this law is obtained through a large number of numerical simulations and experiments. Through the change of the above law, the heat exchange effect can be further improved and the noise can be reduced.

Preferably, as B2 increases, S1 decreases continuously. But with the increase of B2, the magnitude of S1's continuous decrease becomes smaller and smaller. The change of this law is obtained through a large number of numerical simulations and experiments. Through the change of the above law, the heat exchange effect can be further improved and the noise can be reduced.

The core height H is preferably 100 to 500 mm, and more preferably 200 to 300 mm.

Although the present invention has been disclosed above with preferred embodiments, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be based on the scope defined by the claims.

Claims (5)

1. a steam generator, the steam generator comprises a box body, an inner pipe body, a cold water inlet, a hot water outlet and a steam outlet, and the cold water inlet is arranged on the side wall of the box body, and the inner pipe body is arranged In the box, the inner pipe body includes an outer pipe and a core body arranged in the outer pipe, the inner pipe body is arranged in a vertical direction, and a water inlet channel is arranged at the lower part of the inner pipe body to ensure that the water in the box body can enter the inner pipe. The tube body is heated, and the upper part of the inner tube body is connected to the steam outlet; the core body is arranged on the upper part of the water inlet channel, and the inner tube body where the core body is located extends in the vertical direction; the core body is a square through hole and a regular octagon The side length of the square through hole is equal to the side length of the regular octagonal through hole, and the four sides of the square through hole are the sides of four different regular octagonal through holes. The four mutually spaced sides of the hole are the sides of four different square through holes; electric heaters are arranged in the square through holes; the hot water outlet is arranged on the side wall of the box body. 2 . The steam generator according to claim 1 , wherein the cold water inlet is arranged at the lower part of the box body, and the hot water outlet is arranged on the side wall of the upper part of the box body. 3 . 3. The steam generator according to claim 1, wherein an exhaust port is arranged on the upper part of the casing. 4. The steam generator of claim 1, wherein the cross section of the inner tube body is square. 5. The steam generator of claim 1, wherein the cross-sectional area of the steam outlet pipe is smaller than the cross-sectional area of the outer pipe of the inner pipe body.

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