PTC (Positive Temperature Coefficient) electric heating vaporizer

Abstract

A PTC (Positive Temperature Coefficient) electric heating vaporizer relates to the technical field of heating devices and comprises vaporizing tube groups which are arranged in parallel from top to bottom, each vaporizing tube group comprises a plurality of spiral coils which are uniformly distributed in a matrix manner, the two vaporizing tube groups are communicated with each other, the lower vaporizing tube group is connected with an inlet assembly, and the upper vaporizing tube group is connected with a discharge assembly. Each spiral coil is wound on an assembled heat transfer shell, and a plurality of PTC electric heating sheets are arranged on the heat transfer shell in the circumferential direction. The electric heating vaporizer solves the problems that open fire is generated in the working process that a traditional electric heating vaporizer directly heats a target medium through electric energy and a resistance wire, and the existing efficient electric heating vaporizer is limited by a heat source structure and cannot uniformly heat a vaporizing structure, so that the heat exchange efficiency is reduced, and the vaporizing efficiency is reduced.

Description

Technical Field

[0001] This utility model relates to the field of heating device technology, specifically to a PTC electric heating vaporizer. Background Technology

[0002] Currently, the main types of heated vaporizers used in the pressure vessel field are ambient air vaporizers, water bath vaporizers, and electrically heated vaporizers. Their principles and characteristics are as follows:

[0003] Ambient air vaporizers utilize natural convection of ambient air for heating, eliminating the need for external energy sources, making them energy-efficient, environmentally friendly, and quiet with minimal noise and vibration. These vaporizers employ high-efficiency star-shaped aluminum alloy finned tubes as the heat exchanger body, utilizing a special tube expansion and drawing composite technology to significantly reduce the thermal resistance coefficient and improve heat exchange efficiency. However, they are primarily used for the vaporization of cryogenic liquefied gases (such as liquid nitrogen and liquid LNG). At temperatures of -40°C and above, the efficiency of ambient air vaporization decreases and the cycle time becomes longer, thus limiting their application in vaporization devices for liquefied gases at -40°C and above.

[0004] Water bath vaporizers use hot water for heating, which is a type of indirect heating. These vaporizers are widely used in hospitals, steel, metallurgy, petrochemicals, electronics, and other fields, as well as in centralized gas supply projects and gas cylinder testing equipment. The disadvantage is that heat exchange requires multiple stages of heat transfer through electric heating elements, water, heat exchange tubes, and the medium, resulting in low heat transfer efficiency and long cycle times, which sometimes makes them unsuitable for customer use.

[0005] Electric heating vaporizers use electricity to directly heat the target medium using traditional resistance wires. However, they produce open flames during operation. Electric heating vaporizers without explosion-proof treatment are strictly prohibited from use in explosion-proof areas of factories, and explosion-proof treatment would significantly increase costs.

[0006] A prior art patent with publication number CN211902360U discloses a solution including a barrel body, a barrel cover, and a vaporization chamber. A vaporization pipe is located inside the vaporization chamber, along with an electric heating device for heating the water heating medium within the chamber. The barrel body is equipped with an external liquid inlet and an air outlet connected to the vaporization pipe. The barrel body also has a water inlet pipe, a drain pipe, an overflow pipe, a level gauge, and a thermometer, all connected to the vaporization chamber. A stirring motor is mounted on the top of the barrel cover. The output shaft of the stirring motor is connected to one end of a rotating shaft via a reducer. The other end of the rotating shaft penetrates a through-hole in the barrel cover and extends into the vaporization chamber. The end of the rotating shaft is equipped with fan blades. By installing a stirring device on the vaporizer barrel cover, the water heating medium inside the vaporization chamber is stirred, making it easier to raise the temperature of the internal water heating medium, thus effectively accelerating the heating time and improving the overall efficiency of the vaporizer.

[0007] As existing devices are used, the shortcomings of this technology have gradually become apparent, mainly in the following aspects:

[0008] First, the electric heating vaporizer in traditional technology directly heats the target medium with electricity using a traditional resistance wire. However, it produces an open flame during operation. Electric heating vaporizers without explosion-proof treatment are strictly prohibited from use in explosion-proof areas of factories, and explosion-proof treatment would directly and significantly increase costs.

[0009] Secondly, existing electric heating gasifiers are limited by the structure of the heat source, which makes it impossible to heat the gasification structure evenly, reducing heat exchange efficiency and thus lowering gasification efficiency.

[0010] In conclusion, the existing technology obviously has inconveniences and defects in practical use, so it is necessary to improve it. Utility Model Content

[0011] To address the shortcomings of existing technologies, this utility model provides a PTC electric heating vaporizer, which solves the problems of traditional electric heating vaporizers that directly heat the target medium using electricity and traditional resistance wires, but generate open flames during operation; and the limitations of existing electric heating vaporizers in terms of heat source structure, which prevents them from heating the vaporization structure evenly, reducing heat exchange efficiency and thus lowering vaporization efficiency.

[0012] To achieve the above objectives, this utility model provides the following technical solution:

[0013] The PTC electric heating vaporizer includes vaporization tube groups arranged side-by-side from top to bottom. Each group of vaporization tube groups includes several spiral coils evenly distributed in a matrix. The two groups of vaporization tube groups are connected to each other. The lower vaporization tube group is connected to an inlet assembly, and the upper vaporization tube group is connected to an outlet assembly.

[0014] Each of the spiral coils is wound around an assembled heat transfer housing, which is provided with a plurality of PTC electric heating elements circumferentially arranged on the heat transfer housing.

[0015] As an optimized solution, the assembled heat transfer shell includes a complete circular shell formed by two semi-circular pure aluminum shells, and the inner ring of the spiral coil is fitted with the outer ring of the complete circular shell.

[0016] As an optimized solution, each of the semi-circular pure aluminum shells is provided with several insertion channels arranged in parallel along the circumference, and each insertion channel extends along the axial direction of the semi-circular pure aluminum shell, and the PTC electric heating element is inserted into the insertion channel.

[0017] As an optimized solution, a positioning groove is provided on one of the mating ends of the semi-circular pure aluminum shell, and a positioning protrusion is provided on the other mating end of the semi-circular pure aluminum shell.

[0018] As an optimized solution, the cross-sectional shape of the positioning protrusion is trapezoidal, and the shape of the positioning groove matches that of the positioning protrusion.

[0019] As an optimized solution, the inlet assembly includes a horizontally arranged fluid inlet pipe, and one end of several spiral coils located in the lower vaporization tube group are connected to the fluid inlet pipe.

[0020] As an optimized solution, the fluid inlet pipe is also fixedly connected to an inlet flange that communicates with its inner cavity.

[0021] As an optimized solution, the discharge assembly includes a horizontally arranged fluid discharge pipe, and one end of several spiral coils located in the upper vaporization tube group is connected to the fluid discharge pipe.

[0022] As an optimized solution, a discharge flange sleeve communicating with its inner cavity is also fixedly connected to the fluid discharge pipe.

[0023] As an optimized solution, the fluid discharge pipe is located above the fluid inlet pipe.

[0024] As an optimized solution, the other ends of several spiral coils in the lower gasification tube group are connected to the other ends of several spiral coils in the upper gasification tube group.

[0025] Compared with the prior art, the beneficial effects of this utility model are:

[0026] The PTC electric heating vaporizer of this invention is a waterless electric heating operation mode. It replaces the traditional resistance wire or resistance heating rod with PTC electric heating. The surface will not turn red and there is no open flame, which greatly improves the "intrinsic safety" of electric heating equipment in chemical areas and meets the high explosion-proof requirements of customers' equipment.

[0027] The present invention uses a combination of PTC electric heating element, aluminum heat transfer shell (with high heat transfer efficiency) and stainless steel spiral coil to achieve efficient circulation of heating, heat transfer and pressurization. The PTC electric heating element has low thermal resistance but high heat exchange efficiency, the surface does not turn red and there is no open flame, which is highly safe. It can automatically keep the temperature in the high temperature zone, withstand high pressure and low power consumption, and is highly efficient, energy-saving and environmentally friendly, and has a long service life.

[0028] Because PTC electric heating has low thermal resistance, fast heating and high efficiency, and short thermal cycle time, it can greatly shorten the heating time while meeting safety requirements, thus meeting the customer's heating interval requirements.

[0029] The entire circular shell, formed by two semi-circular pure aluminum shells, forms an assembled heat transfer shell. Up to six sets of PTC electric heating elements can be symmetrically installed inside the shell according to design requirements. The inner ring of the spiral coil fits into the outer ring of the entire circular shell, allowing the heat from the PTC electric heating elements to be evenly transferred to the spiral coil wound on the outside using the assembled heat transfer shell. Attached Figure Description

[0030] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0031] Figure 1 This is a schematic diagram of the structure of this utility model;

[0032] Figure 2 This is a top view of the structure of this utility model;

[0033] Figure 3 This is a schematic diagram of the assembled heat transfer shell of this utility model.

[0034] In the diagram: 1-spiral coil; 2-fluid inlet pipe; 3-fluid outlet pipe; 4-inlet flange; 5-outlet flange; 6-assembled heat transfer shell; 7-semi-circular pure aluminum shell; 8-insertion channel; 9-PTC electric heating element; 10-positioning protrusion. Detailed Implementation

[0035] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0036] like Figures 1 to 3 As shown, the PTC electric heating vaporizer includes vaporization tube groups arranged side by side from top to bottom. Each vaporization tube group includes several spiral coils 1 evenly distributed in a matrix. The two vaporization tube groups are connected to each other. The lower vaporization tube group is connected to an inlet component, and the upper vaporization tube group is connected to an outlet component.

[0037] Each spiral coil 1 is wound around the assembled heat transfer housing 6, and several PTC electric heating elements 9 are arranged around the heat transfer housing in the circumferential direction.

[0038] The assembled heat transfer housing 6 includes a complete circular housing formed by two semi-circular pure aluminum housings 7, and the inner ring of the spiral coil 1 is fitted with the outer ring of the complete circular housing.

[0039] Each semi-circular pure aluminum shell has several insertion channels 8 arranged in parallel along the circumference. Each insertion channel 8 extends along the axial direction of the semi-circular pure aluminum shell, and the PTC electric heating element 9 is inserted into the insertion channel 8.

[0040] A positioning groove is provided on one of the mating ends of the semi-circular pure aluminum shell 7, and a positioning protrusion 10 is provided on the other mating end of the semi-circular pure aluminum shell 7.

[0041] The positioning protrusion 10 has a trapezoidal cross-sectional shape, and the shape of the positioning groove matches that of the positioning protrusion 10.

[0042] The inlet assembly includes a horizontally positioned fluid inlet pipe 2, and one end of several spiral coils 1 located in the lower vaporization tube group are connected to the fluid inlet pipe 2.

[0043] An inlet flange 4, which connects to the inner cavity of the fluid inlet pipe, is also fixedly connected to the fluid inlet pipe.

[0044] The discharge assembly includes a horizontally arranged fluid discharge pipe 3, and one end of several spiral coils 1 located in the upper vaporization pipe group are connected to the fluid discharge pipe 3.

[0045] A discharge flange 5, which connects to the inner cavity of the fluid discharge pipe 3, is also fixedly connected to the fluid discharge pipe 3.

[0046] The fluid discharge pipe 3 is located above the fluid inlet pipe 2.

[0047] The other ends of several spiral coils 1 located in the lower gasification tube group are connected to the other ends of several spiral coils 1 located in the upper gasification tube group.

[0048] The assembled heat transfer housing 6 consists of PTC electric heating elements 9, a pure aluminum housing, PT100, wires, etc. In order to maximize the heat transfer area and reduce the amount of materials used and the weight (saving costs), the housing is assembled from two identical half-lobes. It has 6 elongated oval insertion channels 8 for assembling PTC electric heating elements 9. The heat power of PTC electric heating is rapidly and evenly conducted to the whole body of the housing, and then continues to complete the heat transfer process with the coil.

[0049] The working principle of this device is as follows:

[0050] The cryogenic fluid enters the electric heater through the flange 4, and then flows through the bottom spiral coil 1. The cryogenic liquid phase is heated during its flow within the bottom coil, but heating alone is insufficient to completely vaporize the liquid phase before it reaches the bottom coil. The relatively slow flow velocity of the cryogenic liquid phase within the bottom coil is beneficial for heat transfer. The electric heating power in the bottom spiral coil accounts for approximately 65% ​​of the entire equipment, completing the main heating process for the liquid phase. The partially vaporized cryogenic fluid returns to the upper spiral coil 1 to continue flowing. However, due to the partial vaporization of the cryogenic fluid, the pressure within the coil increases sharply, causing the flow velocity of the medium in the upper coil to accelerate under certain pressure. Since both gas and liquid phases coexist, this increased velocity is detrimental to heat transfer. Furthermore, because the heat transfer coefficient of gas is much lower than that of liquid, the upper coil is primarily designed for insulation, with heating as a secondary function. The heating power of the upper coil accounts for approximately 35% of the entire equipment. This configuration satisfies the heating and pressurization requirements based on fluid characteristics while also saving energy and improving efficiency.

[0051] The spiral coil 1 is wound with a specific pitch, diameter, and wall thickness to form a spiral tube with a defined heat transfer area. A low-temperature fluid medium flows inside the coil. A PTC electric heating rod is embedded within the inner cavity of the spiral coil. The heating rod is made of pure aluminum (high heat transfer coefficient and efficiency). The electric heating rod and the coil are connected via two methods: direct contact between the heating rod and the coil, and indirect conduction between the air and the coil. The electric heating rod is connected to an explosion-proof electrical control cabinet via wires. It has a built-in PT100 temperature control element and, under the coordination of the control cabinet, features automatic heating activation at low temperatures and automatic power-off upon reaching the set temperature. Combined with the PTC's inherent over-temperature protection function, this multi-layered safety system ensures the inherent safety of the equipment.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.

Claims

1. A PTC electric heating vaporizer, characterized in that: It includes a series of gasification tube groups arranged side by side from top to bottom. Each gasification tube group includes several spiral coils (1) evenly distributed in a matrix. The two gasification tube groups are connected to each other. The lower gasification tube group is connected to an inlet component, and the upper gasification tube group is connected to an outlet component. Each of the spiral coils (1) is wound on an assembled heat transfer housing (6), and the heat transfer housing is provided with a plurality of PTC electric heating elements (9) around its circumference.

2. The PTC electric heating vaporizer according to claim 1, characterized in that: The assembled heat transfer shell (6) includes a complete circular shell formed by two semi-circular pure aluminum shells (7), and the inner ring of the spiral coil (1) is in contact with the outer ring of the complete circular shell.

3. The PTC electric heating vaporizer according to claim 2, characterized in that: Each of the semi-circular pure aluminum shells is provided with several insertion channels (8) arranged in parallel along the circumference. Each insertion channel (8) extends along the axial direction of the semi-circular pure aluminum shell, and the PTC electric heating element (9) is inserted into the insertion channel (8).

4. The PTC electric heating vaporizer according to claim 2, characterized in that: A positioning groove is provided on one of the mating ends of the semi-circular pure aluminum shell (7), and a positioning protrusion (10) is provided on the other mating end of the semi-circular pure aluminum shell (7).

5. The PTC electric heating vaporizer according to claim 4, characterized in that: The cross-sectional shape of the positioning protrusion (10) is trapezoidal, and the shape of the positioning groove matches that of the positioning protrusion (10).

6. The PTC electric heating vaporizer according to claim 1, characterized in that: The inlet assembly includes a horizontally arranged fluid inlet pipe (2), and one end of several spiral coils (1) located in the lower vaporization tube group are connected to the fluid inlet pipe (2).

7. The PTC electric heating vaporizer according to claim 6, characterized in that: The fluid inlet pipe is also fixedly connected to an inlet flange (4) that communicates with its inner cavity.

8. The PTC electric heating vaporizer according to claim 1, characterized in that: The discharge assembly includes a horizontally arranged fluid discharge pipe (3), and one end of several spiral coils (1) located in the upper vaporization tube group are connected to the fluid discharge pipe (3).

9. The PTC electric heating vaporizer according to claim 8, characterized in that: The fluid discharge pipe (3) is also fixedly connected to a discharge flange (5) that communicates with its inner cavity.

10. The PTC electric heating vaporizer according to claim 1, characterized in that: The other ends of several spiral coils (1) in the lower gasification tube group are connected to the other ends of several spiral coils (1) in the upper gasification tube group.

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