A small electric steam boiler

Abstract

The utility model discloses a small electric steam boiler, including the vertical setting casing, be equipped with water cavity in the casing, the lower part one side of water cavity is connected with the boiler water inlet pipe, and the lower part other side of water cavity is equipped with the first electric heating tube of inserting setting, and the lower part one end of water cavity is inserted and is equipped with the second electric heating tube, and the first electric heating tube and the second electric heating tube cross arrangement, and the upper part of water cavity is equipped with the steam -water separating device. The small electric steam boiler of the utility model has the advantages of compact structure, small size, low water volume, high steam quality, low manufacturing and operation and maintenance cost.

Description

Technical Field

[0001] This utility model relates to a steam boiler, and more particularly to a small electric steam boiler. Background Technology

[0002] In the production and operation of industries such as catering, food processing, and clothing, there is a large and critical demand for small-capacity, low-pressure steam. This type of steam is often used in core processes such as steaming food, ironing clothes, and sterilizing food. However, traditional steam boilers have many limitations in meeting these needs: On the one hand, most traditional boilers are designed with high pressure and large water volume, which not only results in high manufacturing costs and large dimensions, occupying too much production space, but also requires strict compliance with special equipment regulations. Users need to complete complex procedures such as installation notification, usage registration, and annual inspection, significantly increasing the operating and management costs after the equipment is purchased. On the other hand, although some small-capacity boilers have attempted to reduce the water volume to simplify the process, they are limited by structural design, resulting in a small steam space, poor steam-water separation, and high humidity in the produced steam. This makes it difficult to meet the industry's requirements for high-quality steam, easily leading to unstable product quality and seriously affecting production efficiency and product quality. Utility Model Content

[0003] The purpose of this invention is to provide a small electric steam boiler to solve the problems existing in the prior art.

[0004] The purpose of this utility model is achieved as follows: A small electric steam boiler includes a vertically arranged shell, a water chamber inside the shell, a boiler inlet pipe connected to one side of the lower part of the water chamber, a first electric heating tube inserted on the other side of the lower part of the water chamber, a second electric heating tube inserted at one end of the lower part of the water chamber, the first electric heating tube and the second electric heating tube being arranged crosswise, and a steam-water separation device provided at the upper part of the water chamber.

[0005] This utility model of a small electric steam boiler, by adopting a vertical shell and water chamber design, combined with cross-arranged first and second electric heating tubes, can reduce the height of the cylinder and effectively reduce the overall water volume of the boiler. With the addition of a steam-water separation device at the top of the water chamber, the product can achieve a design and operating pressure of less than or equal to 0.8MPa and a boiler water volume of less than or equal to 50L (i.e., meeting the requirements of a Class D steam boiler). This product can be shipped after passing the drawing review and manufacturing inspection. Users do not need to provide installation instructions, special equipment use registration, or annual inspection, which can greatly reduce the user's operating costs.

[0006] As a further improvement of this utility model, the steam-water separation device includes an upper cover plate, a lower ring plate, and a surrounding plate connected between the upper cover plate and the lower ring plate. A conical plate is connected to the bottom of the lower ring plate, and a drain pipe is connected to the center of the bottom of the conical plate. Steam inlets are provided on the upper cover plate, the lower ring plate, and the conical plate. Vertical corrugated plates are arranged between the upper cover plate and the lower ring plate. The upper cover plate, the lower ring plate, the surrounding plate, and the conical plate constitute a stable separation chamber. The drain pipe can discharge the separated condensate in a timely manner, avoiding condensate backflow that affects steam quality. The densely arranged vertical corrugated plates can significantly increase the steam-water contact area and enhance the steam-water separation effect. Compared with a simple separation structure, this design achieves efficient steam-water separation, significantly improves steam dryness, solves the problems of small steam space and poor steam quality in small boilers, and ensures stable and pure steam output.

[0007] As a further improvement of this utility model, the steam inlet holes on the upper cover plate are small round holes, arranged in a ring around the outer periphery of the upper cover plate, while the steam inlet holes on the lower ring plate and the conical plate are elongated. The small round holes can filter and throttle the rising steam, reducing the entry of large water droplets into the separation chamber. The arrangement of the small round holes around the outer periphery can further improve the steam-water separation effect. The elongated perforated plates can intercept some condensate while ensuring smooth steam entry. The differentiated perforation design optimizes the steam flow path and separation effect, making steam-water separation more targeted and efficient, achieving a steam humidity of ≤4%.

[0008] As a further improvement of this utility model, the shell is provided with an upper tube sheet and a lower tube sheet, the water cavity is located between the upper tube sheet and the lower tube sheet, the bottom of the lower tube sheet is connected to a drain pipe, the end of the drain pipe extends from the bottom side of the shell, the upper end of the enclosure plate is welded and fixed to the upper tube sheet, and a tube seat is provided between the upper tube sheet and the top of the shell, which makes the boiler structure more compact and stable, and facilitates manufacturing and installation. At the same time, the design of the drain pipe facilitates daily maintenance and cleaning, and extends the service life of the boiler.

[0009] As a further improvement of this utility model, both the first and second electric heating tubes include upper and lower sets fixed on the same mounting plate. On the one hand, the same mounting plate facilitates the unified installation, disassembly, and maintenance of the electric heating tubes, reducing the difficulty and cost of later maintenance; on the other hand, the layout of the upper and lower sets of heating tubes enables the water in the water chamber to be heated more evenly, avoiding excessively high local water temperatures or heating dead zones, improving heating efficiency, shortening steam generation time, and better meeting the timely steam supply requirements of continuous production in the industry.

[0010] As a further improvement of this utility model, a protective cover is provided between the outer ends of the first and second electric heating tubes and the shell, providing additional safety protection, preventing external interference or accidental contact, reducing operational risks, and protecting the heating elements from damage, thereby improving the boiler's durability and user safety.

[0011] As a further improvement of this utility model, a liquid level alarm device is provided on one side of the water cavity, which realizes real-time monitoring and early warning of the boiler water level, effectively preventing safety hazards such as dry burning, and ensuring the stable operation and safe operation of the boiler. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the small electric steam boiler of this utility model.

[0013] Figure 2 for Figure 1 Top view.

[0014] Figure 3 for Figure 2 KK View.

[0015] Figure 4 This is a schematic diagram of the steam-water separator of the small electric steam boiler of this utility model.

[0016] Figure 5 for Figure 4 Schematic diagram of PP.

[0017] Figure 6 for Figure 4 Schematic diagram of the upper and middle cover plate.

[0018] Figure 7 for Figure 4 Schematic diagram of the lower and middle ring plates.

[0019] Figure 8 for Figure 4 A schematic diagram of the unfolded central cone plate.

[0020] The components include: 1. Shell, 2. Water chamber, 3. Boiler inlet pipe, 4. First electric heating tube, 5. Second electric heating tube, 6. Mounting plate, 7. Protective cover, 8. Upper cover plate, 9. Lower ring plate, 10. Enclosure plate, 11. Conical plate, 12. Drain pipe, 13. Corrugated plate, 14. Upper tube plate, 15. Lower tube plate, 16. Sewage pipe, 17. Pipe seat, and 18. Liquid level alarm device. Detailed Implementation

[0021] like Figure 1-8The small electric steam boiler shown includes a vertically mounted shell 1, with a water chamber 2 inside. A boiler inlet pipe 3 is connected to one side of the lower part of the water chamber 2, and a first electric heating element 4 is inserted into the other side of the lower part of the water chamber 2. A second electric heating element 5 is inserted into one end of the lower part of the water chamber 2, with the first and second electric heating elements 4 and 5 arranged alternately. In this embodiment, both the first and second electric heating elements 4 and 5 consist of two sets, upper and lower, fixed to the same mounting plate 6. On one hand, the shared mounting plate 6 facilitates the unified installation, disassembly, and maintenance of the electric heating elements, reducing the difficulty and cost of later maintenance. On the other hand, the arrangement of the upper and lower sets of heating elements allows for more uniform heating of the water in the water chamber 2, avoiding localized overheating or heating dead zones, improving heating efficiency, and shortening steam generation time. A protective cover 7 is provided between the outer ends of the first and second electric heating elements 4 and the shell 1, providing additional safety protection and improving the boiler's durability and user safety.

[0022] A steam-water separator is installed at the top of water chamber 2. A steam outlet pipe is connected to the top of the steam-water separator. For example... Figure 4-8 As shown, the steam-water separator includes an upper cover plate 8, a lower ring plate 9, and a surrounding plate 10 connecting the upper cover plate 8 and the lower ring plate 9. A conical plate 11 is connected to the bottom of the lower ring plate 9, and a drain pipe 12 is connected to the center of the bottom of the conical plate 11. The upper cover plate 8, the lower ring plate 9, and the conical plate 11 are provided with steam inlets. The steam inlets on the upper cover plate 8 are small round holes, arranged around its outer perimeter. The steam inlets on the lower ring plate 9 and the conical plate 11 are elongated. Vertical corrugated plates 13 are arranged between the upper cover plate 8 and the lower ring plate 9. The upper cover plate 8, lower ring plate 9, surrounding plate 10, and cone plate 11 form a stable separation chamber. The drain pipe 12 can discharge the condensate after separation in a timely manner, avoiding the backflow of condensate and affecting the steam quality. The densely arranged vertical corrugated plates 13 can significantly increase the steam-water contact area and enhance the steam-water separation effect. Compared with a simple separation structure, this design achieves efficient steam-water separation, significantly improves the steam dryness (reaching steam humidity ≤4%), solves the problem of small steam space and poor steam quality in small boilers, and ensures stable and pure steam output.

[0023] like Figure 1 , Figure 3 As shown, the shell 1 contains an upper tube sheet 14 and a lower tube sheet 15. The water chamber 2 is located between the upper tube sheet 14 and the lower tube sheet 15. A drain pipe 16 is connected to the bottom of the lower tube sheet 15, and the end of the drain pipe 16 extends from the bottom side of the shell 1. The upper end of the surrounding plate 10 is welded and fixed to the upper tube sheet 14. A pipe seat 17 is provided between the upper tube sheet 14 and the top of the shell 1, making the boiler structure more compact and stable, facilitating manufacturing and installation. At the same time, the design of the drain pipe 16 facilitates daily maintenance and cleaning, extending the service life of the boiler. A liquid level alarm device 18 is provided on one side of the water chamber 2, realizing real-time monitoring and early warning of the boiler water level, effectively preventing safety hazards such as dry burning, and ensuring the stable operation and safe operation of the boiler.

[0024] The small electric steam boiler in this embodiment adopts a vertical shell and water chamber design, combined with cross-arranged first and second electric heating tubes, and a uniquely designed steam-water separation device set in the upper part of the water chamber. This allows the product to be designed and used at a pressure of less than or equal to 0.8 MPa, and the boiler water volume to be less than or equal to 50 L, meeting the requirements of a Class D steam boiler. The boiler product can be shipped after passing the drawing appraisal and manufacturing inspection. Users do not need to provide installation instructions, special equipment use registration, or annual inspection, which can greatly reduce the user's operating costs.

[0025] This utility model is not limited to the above embodiments. Based on the technical solutions disclosed in this utility model, those skilled in the art can make some substitutions and modifications to some of the technical features without creative labor, and these substitutions and modifications are all within the protection scope of this utility model.

Claims

1. A small electric steam boiler, comprising a vertically arranged shell, a water cavity is arranged in the shell, a boiler water inlet pipe is connected to one side of the lower part of the water cavity, characterized in that: A first electric heating tube is inserted on the other side of the lower part of the water cavity, and a second electric heating tube is inserted at one end of the lower part of the water cavity. The first and second electric heating tubes are arranged crosswise, and a steam-water separation device is provided on the upper part of the water cavity.

2. A compact electric steam boiler according to claim 1, characterized in that: The steam-water separation device includes an upper cover plate, a lower ring plate, and a surrounding plate connected between the upper cover plate and the lower ring plate. A conical plate is connected to the bottom of the lower ring plate, and a drain pipe is connected to the center of the bottom of the conical plate. Steam inlet holes are provided on the upper cover plate, the lower ring plate, and the conical plate. Vertical corrugated plates are arranged between the upper cover plate and the lower ring plate.

3. A compact electric steam boiler according to claim 2, characterized in that: The steam inlet holes on the upper cover plate are small round holes, which are arranged around the outer periphery of the upper cover plate. The steam inlet holes on the lower ring plate and the conical plate are elongated.

4. The compact electric steam boiler of claim 2, wherein: The shell contains an upper tube sheet and a lower tube sheet. The water chamber is located between the upper tube sheet and the lower tube sheet. A drain pipe is connected to the bottom of the lower tube sheet. The end of the drain pipe extends from the bottom side of the shell. The upper end of the enclosure is welded and fixed to the upper tube sheet. A tube seat is provided between the upper tube sheet and the top of the shell.

5. The compact electric steam boiler of claim 2, wherein: The first electric heating tube and the second electric heating tube both include two sets, upper and lower, fixed on the same mounting plate.

6. The compact electric steam boiler according to claim 5, characterized in that: A protective cover is provided between the outer ends of the first and second electric heating tubes and the housing.

7. A compact electric steam boiler according to any of claims 1-6, characterized in that: A liquid level alarm device is installed on one side of the water chamber.

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