Three-phase electric heating device composed of three single-phase resistance heaters

Abstract

The invention discloses a three-phase electric heating device composed of three single-phase resistance heaters, which comprises a first shell, a second shell, a third shell, a first one-way resistance heater, a second one-way resistance heater and a third one-way resistance heater, the first one-way resistance heater is arranged in the first shell, the second one-way resistance heater is arranged in the second shell, the third one-way resistance heater is arranged in the third shell, and the first one-way resistance heater, the second one-way resistance heater and the third one-way resistance heater are equal in resistance value and rated power. The first one-way resistance heater, the second one-way resistance heater and the third one-way resistance heater are respectively connected with three phases of the ABC, and the ABC adopts a Y-shaped connection method. Compared with the prior art, the device has the following beneficial effects that the one-way resistance heaters are respectively arranged in the three shells, so that separate cavity heating is realized, the processing difficulty of the shells is reduced, the compression resistance is higher, and a medium is heated more quickly.

Description

Technical Field

[0001] The invention relates to the field of electric heating equipment, in particular to a three-phase electric heating device composed of three single-phase resistance heaters. Background Art

[0002] The current three-phase electricity-based heating device is shown in patent publication document CN214745632U. The three-phase electric heating device shown in this structure uses three electrode rods (also called phase electrodes) to heat the medium with the medium as a conductor, converting electrical energy into thermal energy. In order to maintain safety during the heating process and avoid mutual discharge between the three electrode rods, a certain safety distance must be maintained between two adjacent electrode rods (the higher the voltage, the greater the safety distance). At the same time, a certain safety distance also needs to be maintained between the electrode rods and the shell. In order to ensure the safety distance between the electrode rods and the safety distance between the electrode rods and the shell, the volume of the entire shell is relatively large. For the current boiler-type heating container, when the internal pressure strength is the same, the larger the volume of the container, the thicker the shell wall needs to be. The increase in the shell wall thickness will increase the difficulty of shell processing and cause the weight of the entire device to be too large. Summary of the invention

[0003] In view of the above problems, the present invention proposes a three-phase electric heating device composed of three single-phase resistance heaters.

[0004] The technical solution adopted by the present invention is as follows:

[0005] A three-phase electric heating device composed of three single-phase resistance heaters comprises a first shell, a second shell, a third shell, a first unidirectional resistance heater, a second unidirectional resistance heater and a third unidirectional resistance heater, wherein the first unidirectional resistance heater is arranged in the first shell, the second unidirectional resistance heater is arranged in the second shell, and the third unidirectional resistance heater is arranged in the third shell, the resistance value and the rated power of the first unidirectional resistance heater, the second unidirectional resistance heater and the third unidirectional resistance heater are equal, the first shell, the second shell and the third shell are in an insulated state with the first unidirectional resistance heater, the second unidirectional resistance heater and the third unidirectional resistance heater respectively, the first unidirectional resistance heater, the second unidirectional resistance heater and the third unidirectional resistance heater are connected to the three phases A\B\C respectively, and A\B\C adopts a Y-type connection method.

[0006] In this electric heating device, a first shell, a second shell and a third shell are used, and a unidirectional resistance heater is arranged in each shell, which are respectively the first unidirectional resistance heater, the second unidirectional resistance heater and the third unidirectional resistance heater. The first unidirectional resistance heater is used to heat the medium in the first shell, the second unidirectional resistance heater is used to heat the medium in the second shell, and the third unidirectional resistance heater is used to heat the medium in the third shell. The first unidirectional resistance heater, the second unidirectional resistance heater and the third unidirectional resistance heater are respectively connected to the three phases A\B\C, and the first unidirectional resistance heater, the second unidirectional resistance heater and the third unidirectional resistance heater are turned on to heat the medium in the first shell, the second shell and the third shell synchronously.

[0007] In this type of electric heating device, a unidirectional resistance heater is used instead of an electrode rod. The unidirectional resistance heater generates heat through resistance. The heating process of the unidirectional resistance heater does not require the help of electrolytes. Therefore, under the same voltage, the safety distance between the unidirectional resistance heater and the shell is smaller than the safety distance between the electrode rod and the shell. At the same time, since only one unidirectional resistance heater is set in a shell in this device, it is only necessary to meet the safety distance between the unidirectional resistance heater and the shell. In this way, the volume of the shell can be greatly reduced. When the pressure strength is the same, the wall thickness requirement for the shell is also greatly reduced. This not only reduces the difficulty of shell processing, but also reduces the weight of the entire device. And under the same wall thickness, stronger pressure resistance can be achieved.

[0008] At the same time, in this heating device, since only one unidirectional resistance heater is arranged in a shell, the area of ​​the unidirectional resistance heater accounts for a relatively high proportion and the area of ​​the medium accounts for a relatively small proportion within the unit shell area, so that the medium can be heated at a faster speed.

[0009] In summary, this device realizes chamber heating by arranging a unidirectional resistance heater in each of the three shells, reduces the difficulty of shell processing, has higher pressure resistance, and heats the medium faster.

[0010] Optionally, the first shell, the second shell and the third shell have the same structure and size, and the first shell is cylindrical.

[0011] Optionally, it also includes a feed pipe and a discharge pipe, and the first shell, the second shell and the third shell are all connected to the feed pipe and the discharge pipe.

[0012] Optionally, an end cover is further included, and the first shell, the second shell and the third shell are all provided with the end cover.

[0013] Optionally, there are multiple first shells, multiple second shells, and multiple third shells, and the number of first shells, second shells, and third shells is equal. Each first shell is provided with a first unidirectional resistance heater, each second shell is provided with a second unidirectional resistance heater, and each third shell is provided with a third unidirectional resistance heater.

[0014] Specifically in the present device, each of the first shell, the second shell and the third shell constitutes a group of heating units, and each group of heating units can heat the medium.

[0015] Optionally, the medium in the first shell is solid, liquid or gas, the medium in the second shell is solid, liquid or gas, and the medium in the third shell is solid, liquid or gas.

[0016] Optionally, the medium in the first shell, the medium in the second shell, and the medium in the third shell are the same or different.

[0017] Optionally, it further includes a rack, and the first shell, the second shell and the third shell are all arranged on the rack.

[0018] The beneficial effects of the present invention are as follows: by arranging a unidirectional resistance heater in each of the three shells, chamber heating is achieved, the difficulty of shell processing is reduced, the pressure resistance is higher, and the medium is heated faster. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0020] Figure 1 It is a schematic diagram of the structure of a three-phase electric heating device composed of three single-phase resistance heaters;

[0021] Figure 2 It is a schematic diagram of the working principle of a three-phase electric heating device composed of three single-phase resistance heaters.

[0022] The reference numerals in the figure are: 1, frame; 2, feed pipe; 3, end cover; 401, first shell; 402, second shell; 403, third shell; 5, discharge pipe; 601, first unidirectional resistance heater; 602, second unidirectional resistance heater; 603, third unidirectional resistance heater. DETAILED DESCRIPTION

[0023] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0024] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0025] In the description of the present application, it should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. For ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0026] As attached Figure 1 And attached Figure 2 As shown, a three-phase electric heating device composed of three single-phase resistance heaters includes a first shell 401, a second shell 402, a third shell 403, a first unidirectional resistance heater 601, a second unidirectional resistance heater 602 and a third unidirectional resistance heater 603. The first unidirectional resistance heater 601 is arranged in the first shell 401, the second unidirectional resistance heater 602 is arranged in the second shell 402, and the third unidirectional resistance heater 603 is arranged in the third shell 403. The resistance value and rated power of the second unidirectional resistance heater 602 and the third unidirectional resistance heater 603 are equal, the first shell 401, the second shell 402 and the third shell 403 are insulated and isolated from the first unidirectional resistance heater 601, the second unidirectional resistance heater 602 and the third unidirectional resistance heater 603 respectively, the first unidirectional resistance heater 601, the second unidirectional resistance heater 602 and the third unidirectional resistance heater 603 are connected to the three phases A\B\C respectively, and A\B\C adopts Y-type connection.

[0027] In this electric heating device, a first shell 401, a second shell 402 and a third shell 403 are used, and a unidirectional resistance heater is arranged in each shell, which are respectively a first unidirectional resistance heater 601, a second unidirectional resistance heater 602 and a third unidirectional resistance heater 603. The first unidirectional resistance heater 601 is used to heat the medium in the first shell 401, the second unidirectional resistance heater 602 is used to heat the medium in the second shell 402, and the third unidirectional resistance heater 603 is used to heat the medium in the third shell 403. The first unidirectional resistance heater 601, the second unidirectional resistance heater 602 and the third unidirectional resistance heater 603 are connected to the three phases A\B\C respectively, and the first unidirectional resistance heater 601, the second unidirectional resistance heater 602 and the third unidirectional resistance heater 603 are turned on to heat the medium in the first shell 401, the second shell 402 and the third shell 403 synchronously.

[0028] In this type of electric heating device, a unidirectional resistance heater is used instead of an electrode rod. The unidirectional resistance heater generates heat through resistance. The heating process of the unidirectional resistance heater does not require the help of an electrolyte. Therefore, under the same voltage, the safety distance between the unidirectional resistance heater and the shell is smaller than the safety distance between the electrode rod and the shell. At the same time, since only one unidirectional resistance heater is provided in a shell in this device, it is only necessary to meet the safety distance between the unidirectional resistance heater and the shell, and there is no need to consider the safety distance between phases. In this way, the volume of the shell can be greatly reduced. When the pressure bearing strength is the same, the wall thickness requirement for the shell is also greatly reduced. This not only reduces the difficulty of shell processing, but also reduces the weight of the entire device. And under the same wall thickness, stronger pressure resistance can be achieved. And the resistance heater heats the medium by heat transfer, and there will be no problem of hydrogen production by electrolysis of water.

[0029] At the same time, in this heating device, since only one unidirectional resistance heater is arranged in a shell, the area of ​​the unidirectional resistance heater accounts for a relatively high proportion and the area of ​​the medium accounts for a relatively small proportion within the unit area of ​​the shell. In this way, the medium can be heated at a faster speed and the heating of the medium is more uniform.

[0030] In summary, this device realizes chamber heating by arranging a unidirectional resistance heater in each of the three shells, which reduces the difficulty of shell processing, has higher pressure resistance, and heats the medium faster.

[0031] As attached Figure 1 And attached Figure 2 As shown, the first shell 401 , the second shell 402 and the third shell 403 have the same structure and size, and the first shell 401 is cylindrical.

[0032] As attached Figure 1And attached Figure 2 As shown, it also includes a feed pipe 2 and a discharge pipe 5 , and the first shell 401 , the second shell 402 and the third shell 403 are all connected with the feed pipe 2 and the discharge pipe 5 .

[0033] The specific medium enters the shell through the feed pipe 2, is heated by the unidirectional resistance heater in the shell, and then leaves from the discharge pipe 5.

[0034] As attached Figure 1 And attached Figure 2 As shown, an end cover 3 is also included, and the first shell 401 , the second shell 402 and the third shell 403 are all provided with an end cover 3 .

[0035] As attached Figure 1 And attached Figure 2 As shown, there are multiple first shells 401, multiple second shells 402, and multiple third shells 403, and the number of first shells 401, second shells 402 and third shells 403 is equal, each first shell 401 is provided with a first unidirectional resistance heater 601, each second shell 402 is provided with a second unidirectional resistance heater 602, and each third shell 403 is provided with a third unidirectional resistance heater 603.

[0036] Specifically in this device, each of the first shell 401, the second shell 402 and the third shell 403 constitutes a group of heating units, and each group of heating units can heat the medium. Figure 1 There are three groups of heating units in total, which can realize step heating of the medium. Assuming that the leftmost is the first unit, the middle is the second unit, and the right is the third unit, the first heating unit can heat low-temperature water into high-temperature water, the second heating unit can heat high-temperature water into steam, and the third heating unit can heat steam into superheated steam. In this device, the feed pipes on the same group of heating units are connected to the same feed main pipe, and the discharge pipes on the same group of heating units are connected to the same discharge main pipe.

[0037] The voltage adapted in this device can be 10KV and above.

[0038] As attached Figure 1 And attached Figure 2 As shown, the medium in the first shell 401 is solid, liquid or gas, the medium in the second shell 402 is solid, liquid or gas, and the medium in the third shell 403 is solid, liquid or gas.

[0039] Specifically, the heating medium in the device can be liquid (including but not limited to pure water), molten salt, or steam.

[0040] As attached Figure 1 And attached Figure 2 As shown, the medium in the first shell 401, the medium in the second shell 402, and the medium in the third shell 403 are the same or different.

[0041] As attached Figure 1 And attached Figure 2 As shown, it also includes a rack 1 , and the first shell 401 , the second shell 402 and the third shell 403 are all arranged on the rack 1 .

[0042] The above-described embodiments only express some embodiments of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that for those skilled in the art, it is still possible to modify the technical solutions recorded in the above-mentioned embodiments, or to replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A three-phase electric heating device composed of three single-phase resistance heaters, characterized in that: It includes a first shell, a second shell, a third shell, a first unidirectional resistance heater, a second unidirectional resistance heater and a third unidirectional resistance heater, the first unidirectional resistance heater is arranged in the first shell, the second unidirectional resistance heater is arranged in the second shell, and the third unidirectional resistance heater is arranged in the third shell, the resistance value and the rated power of the first unidirectional resistance heater, the second unidirectional resistance heater and the third unidirectional resistance heater are equal, the first shell, the second shell and the third shell are insulated and isolated from the first unidirectional resistance heater, the second unidirectional resistance heater and the third unidirectional resistance heater respectively, the first unidirectional resistance heater, the second unidirectional resistance heater and the third unidirectional resistance heater are connected to the three phases A\B\C respectively, and A\B\C adopts Y-type connection.

2. A three-phase electric heating device composed of three single-phase resistance heaters according to claim 1, characterized in that: The first shell, the second shell and the third shell have the same structure and size, and the first shell is cylindrical.

3. A three-phase electric heating device composed of three single-phase resistance heaters according to claim 1, characterized in that: It also includes a feed pipe and a discharge pipe, and the first shell, the second shell and the third shell are all connected with the feed pipe and the discharge pipe.

4. A three-phase electric heating device composed of three single-phase resistance heaters according to claim 1, characterized in that: It also includes an end cover, and the first shell, the second shell and the third shell are all provided with the end cover.

5. A three-phase electric heating device composed of three single-phase resistance heaters according to claim 1, characterized in that: There are multiple first shells, multiple second shells, and multiple third shells, and the number of first shells, second shells, and third shells is equal. Each first shell is provided with a first unidirectional resistance heater, each second shell is provided with a second unidirectional resistance heater, and each third shell is provided with a third unidirectional resistance heater.

6. A three-phase electric heating device composed of three single-phase resistance heaters according to claim 1, characterized in that: The medium in the first shell is solid, liquid or gas, the medium in the second shell is solid, liquid or gas, and the medium in the third shell is solid, liquid or gas.

7. A three-phase electric heating device composed of three single-phase resistance heaters according to claim 6, characterized in that: The medium in the first shell, the medium in the second shell and the medium in the third shell are the same or different.

8. A three-phase electric heating device composed of three single-phase resistance heaters according to claim 1, characterized in that: It also includes a frame platform, and the first shell, the second shell and the third shell are all arranged on the frame platform.

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