Non-magnetic energy-saving forced convection heating furnace

Abstract

An embodiment of the present application provides a non-magnetic energy-saving forced convection heating furnace, comprising: a Venturi assembly, a heating device, and a heating chamber, wherein the Venturi assembly comprises: a base, an internal accommodating space formed therein, a first inlet and a second inlet provided on the base, the first inlet being used to input air at room temperature; a conduit provided in the accommodating space, one end of the conduit being connected to the first inlet; a nozzle being connected to the other end of the conduit; and a Venturi tube body, comprising an inlet section, a contraction section, a throat, and a diffusion section in sequence, the inlet section being sealedly connected to the base, wherein the output end of the nozzle extends into the contraction section and is arranged adjacent to the throat and connected to the diffusion section. The heating device is connected to the diffusion section and is isolated from the heating device, a third inlet of the heating chamber is connected to the heating device, and the heating chamber is provided with a first outlet and a second outlet, the second outlet being connected to the second inlet.

Description

Technical Field

[0001] Embodiments of the present application relate to a heating furnace, and more particularly to a non-magnetic energy-saving forced convection heating furnace. Background Art

[0002] In some precision scientific experiments and industrial applications, to avoid interference from the electromagnetic field generated by electric heating elements, the heating elements are not placed directly in the heating chamber. Instead, the heating elements heat the room-temperature air, which is then used to heat the furnace. This airflow not only carries heat energy but also ensures a uniform temperature within the chamber.

[0003] Conventional air pumps can only drive room-temperature media and are incapable of operating at high temperatures. Consequently, most such systems do not recycle the medium, instead heating room-temperature air and then releasing it directly into the atmosphere. This increases both primary heating power consumption and secondary power consumption for laboratory air conditioning. Using a high-temperature circulating pump to circulate the gas not only incurs high costs, but also, if installed near a heating furnace, generates electromagnetic fields that interfere with the magnetic field within the furnace. Summary of the Invention

[0004] In order to solve at least one of the technical problems mentioned above or other aspects, an embodiment of the present application provides a non-magnetic energy-saving forced convection heating furnace, comprising: a base, forming an accommodating space inside, the base being provided with a first inlet and a second inlet, the first inlet being used to input normal temperature air; a conduit being arranged in the accommodating space, one end of the conduit being connected to the first inlet; a nozzle being connected to the other end of the conduit; a Venturi tube body, comprising an inlet section, a contraction section, a throat and a diffusion section in sequence, the inlet section being sealed and connected to the base, wherein the output end of the nozzle extends into the contraction section and is arranged adjacent to the throat; a heating device being connected to the diffusion section; and a heating chamber being arranged in isolation from the heating device, the third inlet of the heating chamber being connected to the heating device, the heating chamber being provided with a first outlet and a second outlet, the second outlet being connected to the second inlet.

[0005] According to the non-magnetic energy-saving forced convection heating furnace of the embodiment of the present application, the base, the Venturi tube body and the nozzle utilize the Venturi effect to return part of the hot air discharged from the heating chamber to the front end of the heating device for reuse. Partial circulation of the high-temperature gas can be achieved without the need for a high-temperature circulation pump, and no electromagnetic interference is generated in the heating chamber. The cost is low and the effect is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 is a block diagram of the working principle of a non-magnetic energy-saving forced convection heating furnace according to an exemplary embodiment of the present application;

[0007] Figure 2yes Figure 1 A cross-sectional view of the Venturi assembly of the non-magnetic energy-saving forced convection heating furnace;

[0008] Figure 3 yes Figure 2 An exploded cross-sectional view of the venturi assembly of the non-magnetic energy-saving forced convection furnace is shown;

[0009] Figure 4 yes Figure 2 A schematic diagram of the three-dimensional assembly of a non-magnetic energy-saving forced convection heating furnace is shown; and

[0010] Figure 5 yes Figure 2 A cross-sectional view of the nozzle of a non-magnetic energy-saving forced convection heating furnace is shown.

[0011] In the above drawings, the meanings of the reference numerals are as follows:

[0012] 1- base;

[0013] 101-First entrance;

[0014] 102-Second entrance;

[0015] 2-catheter;

[0016] 3- Nozzle;

[0017] 4-Venturi body;

[0018] 401-entrance section;

[0019] 402-contraction section;

[0020] 403-throat;

[0021] 404-diffusion section;

[0022] 5- Heating device;

[0023] 6- Heating chamber;

[0024] 7-Air compressor;

[0025] 8- Temperature sensor; and

[0026] 9-Controller. DETAILED DESCRIPTION

[0027] In order to make the objectives, technical solutions and advantages of this application more clear, this application is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0028] However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the present application. In the detailed description below, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of the embodiments of the present application. However, it is obvious that one or more embodiments may also be implemented without these specific details. In addition, in the following description, the description of known technologies is omitted to avoid unnecessarily confusing the concept of the present application.

[0029] The terms used herein are only for describing specific embodiments and are not intended to limit the present application. The term "comprising" used herein indicates the existence of features, steps, operations, but does not exclude the existence or addition of one or more other features.

[0030] The terms used herein are only for describing specific embodiments and are not intended to limit the present application. The term "comprising" used herein indicates the existence of features, steps, operations, but does not exclude the existence or addition of one or more other features.

[0031] Figure 1 is a block diagram of the working principle of a non-magnetic energy-saving forced convection heating furnace according to an exemplary embodiment of the present application; Figure 2 yes Figure 1 A cross-sectional view of the Venturi assembly of the non-magnetic energy-saving forced convection heating furnace; Figure 3 yes Figure 2 An exploded cross-sectional view of the venturi assembly of a non-magnetic energy-efficient forced convection furnace is shown.

[0032] In order to solve the above technical problems, an embodiment of the present application provides a non-magnetic energy-saving forced convection heating furnace, comprising a Venturi assembly, a heating device 5 and a heating chamber 6, wherein the Venturi assembly comprises a base 1, a conduit 2, a nozzle 3 and a Venturi tube body 4. The interior of the base 1 forms an accommodating space, and a first inlet 101 and a second inlet 102 are provided on the base, and the first inlet 101 is used to input air at room temperature. The conduit 2 is arranged in the accommodating space, and one end of the conduit 2 is connected to the first inlet 101. The nozzle 3 is connected to the other end of the conduit 2. The Venturi tube body 4 includes an inlet section 401, a contraction section 402, a throat 403 and a diffusion section 404 in sequence, and the inlet section 401 is sealed with the base 1, wherein the output end of the nozzle 3 extends into the contraction section 402 and is arranged adjacent to the throat 403. The heating device 5 is connected to the diffusion section 404. The heating chamber 6 is isolated from the heating device 5 , and the third inlet of the heating chamber 6 is connected to the heating device 5 . The heating chamber 6 is provided with a first outlet and a second outlet, and the second outlet is connected to the second inlet 102 .

[0033] In this embodiment, the base 1, the conduit 2, the nozzle 3 and the venturi tube body 4 together form a venturi assembly, which utilizes the venturi effect to partially flow the hot air discharged from the heating chamber 6 back to the front end of the heating device 5 (inside the venturi assembly) for reuse. Partial circulation of the high-temperature gas can be achieved without the need for a high-temperature circulation pump, and no electromagnetic interference is generated to the heating chamber 6. The cost is low and the effect is good.

[0034] According to some embodiments of the present application, the heating chamber 6 is a heating place for the precision element to be heated. When it needs to be heated, the heating chamber 6 is opened and the precision element to be heated is placed therein, the air is heated by the heating device 5, and the hot air is passed into the heating chamber 6 to heat it, wherein the heating device 5 and the heating chamber 6 are isolated in position and space, and the minimum distance between the two should be sufficient to ensure that the electromagnetic interference generated when the heating device 5 works at maximum power does not affect the element to be heated in the heating chamber 6.

[0035] According to some embodiments of the present application, the first inlet 101 is a primary medium input port for inputting ambient temperature air, and the second inlet 102 is a secondary medium input port for receiving hot air returning from the heating chamber 6. Optionally, the ambient temperature air is 25°C. Further, the ambient temperature air is room temperature, which varies depending on the geographical location of the test site and the operating conditions of the air compressor, but is generally controlled to be between 10°C and 40°C.

[0036] According to some embodiments of the present application, the second outlet of the heating chamber 6 is connected to the second inlet 102 via a pipe; the venturi assembly is connected to the heating device 5 via a pipe; and the heating device 5 is connected to the heating chamber 6 via a pipe. The first outlet of the heating chamber 6 is connected to the external environment, allowing the secondary medium, that is, the hot air in the heating chamber 6, to partially escape into the ambient atmosphere.

[0037] According to some embodiments of the present application, the non-magnetic energy-saving forced convection heating furnace further includes an air compressor 7 connected to the first inlet for inputting air at room temperature.

[0038] According to some alternative embodiments of the present application, the non-magnetic energy-saving forced convection heating furnace further includes an air pump or a blower, wherein the output end of the air pump or the blower is connected to the first inlet 101 .

[0039] According to some embodiments of the present application, the accommodating space is a cylindrical space, one end of the accommodating space is provided with an opening sealed and connected to the inlet section 401 , and the other end of the accommodating space is provided with the first inlet 101 .

[0040] Figure 4 yes Figure 2 The three-dimensional assembly diagram of the non-magnetic energy-saving forced convection heating furnace is shown.

[0041] According to some embodiments of the present application, Figure 4 As shown, the base 1 and the inlet section 401 are sealed and connected via a socket.

[0042] According to some alternative embodiments of the present application, the base 1 and the inlet section 401 are provided with coupled internal and external threads, which cooperate with a sealing device to achieve connection and sealing, such as a sealing rubber ring.

[0043] According to some embodiments of the present application, the second inlet 102 is provided on a side surface of the base 1 .

[0044] Figure 5 yes Figure 2 A cross-sectional view of the nozzle of a non-magnetic energy-saving forced convection heating furnace is shown.

[0045] According to some embodiments of the present application, Figure 5 As shown, the output end of the nozzle 3 is a conical surface 301 , and the cone angle of the conical surface 301 is equal to the cone angle of the contraction section 402 .

[0046] According to some embodiments of the present application, the distance between the tip of the nozzle 3 and the inner wall of the throat 403 of the venturi body 4 ranges from 5 to 10 mm.

[0047] In this embodiment, the high-pressure gas input from the first inlet 101 is ejected through the tip of the nozzle 3. The high-speed airflow reduces the air pressure in the space between the tip of the nozzle 3 and the inner wall of the throat 403, thereby producing an adsorption effect. Specifically, based on the low air pressure, the high-temperature gas discharged from the heating chamber 6 will be sucked in through the second inlet, thereby forming a hot air circulation loop, that is, partial circulation of the high-temperature gas can be achieved without the need for a high-temperature circulation pump, and the process is self-circulating, does not generate electromagnetic interference to the heating chamber 6, and has low cost and good effect.

[0048] According to some optional embodiments of the present application, in order to further reduce costs, the nozzle 3 can use a 3D printer nozzle as the nozzle 3 in this application. Among them, the 3D printer nozzles currently on the market are standard parts produced in large quantities, with high precision and high surface quality, but low price. Performance tuning can be achieved at low cost, and there is no need for high-precision CNC (Computer numerical control, CNC machine tools) to prepare a series of nozzles or even bases.

[0049] According to some embodiments of the present application, the inner sidewall of the other end of the conduit 2 is provided with an internal thread, and the outer sidewall of the nozzle 3 is provided with an external thread 302 that matches the internal thread. The inner sidewall of the root of the internal thread of the conduit 2 extends radially inward to form a stepped structure. The diameter of the portion of the conduit located above the stepped structure is greater than the diameter of the portion located below the stepped structure. The stepped structure is configured to form an airtight seal with the end face of the nozzle 3. Specifically, the conduit has a radially annular flat surface that abuts and seals against the end of the nozzle.

[0050] According to some embodiments of the present application, the cone angle of the diverging section 404 of the venturi tube body 4 is smaller than the cone angle of the contracting section 402 .

[0051] According to some embodiments of the present application, the distance between the throat 403 and the port of the contraction section 402 of the venturi body 4 is smaller than the distance between the throat 403 and the port of the divergence section 404 .

[0052] According to some optional embodiments of the present application, the dimensions of the inner conical surface of the venturi tube body 4 are optimized by using computational fluid dynamics tools or by direct trial production according to working conditions such as gas flow resistance, temperature, and flow velocity.

[0053] According to some embodiments of the present application, the pressure range of normal temperature air includes 200-400 kPa.

[0054] According to some embodiments of the present application, the heating device 5 comprises a tubular heater. For example, the tubular heater comprises a branched tubular electric heating element, a cylinder, a deflector, and other components. The tubular electric heating element comprises a high-temperature resistance wire placed within a metal tube, with the interstices tightly filled with crystalline magnesium oxide powder, which has excellent insulation and thermal conductivity. The tubular electric heating element serves as the heating element. A deflector baffle is installed within the cylinder to ensure uniform heating of the air as it circulates. Alternatively, the pipe electric heater is an electric heating device used to heat a pipe or the medium within it. It further comprises two bearing-shaped metal inner shells, each with an electric heating tube fixed to its inner wall; two bearing-shaped heat-conducting layers made of a thermally conductive material for fitting over the pipe, the outer walls of the formed heat-conducting layers being in contact with the inner walls of the two metal inner shells; two bearing-shaped insulation layers being in contact with the outer walls of the two metal inner shells, with two bearing-shaped outer shells disposed on their outer surfaces; and a fixing member for securing the heating assembly to the pipe.

[0055] According to some embodiments of the present application, the non-magnetic energy-saving forced convection heating furnace further includes a temperature sensor 8 and a controller 9. The temperature sensor 8 is disposed within the heating chamber 6 to obtain the temperature of the gas or object to be heated within the heating chamber 6. The controller 9 is connected to the heating device 5 and the temperature sensor 8, respectively. Optionally, the controller 9 includes a PID controller.

[0056] In this embodiment, after receiving the preset temperature instruction, the controller 9 sends a control instruction to the heating device 5 controller to start and heat the air therein. At the same time, it receives the temperature signal in the heating chamber 6 fed back by the temperature sensor 8, and adjusts the heating device 5 in real time to ensure that the temperature in the heating chamber 6 is stably maintained at the preset temperature.

[0057] According to some embodiments of the present application, the heating chamber 6 is made of aluminum alloy or PEEK plastic (Polyetheretherketones).

[0058] According to some embodiments of the present application, the base 1 is made of metal material through computer digital controlled precision machining. Optionally, the ejector base can be made of aluminum alloy, brass and other materials using CNC machining technology according to the attached drawings.

[0059] According to some embodiments of the present application, the base 1 is sealed with the inlet section 401 through a socket.

[0060] The embodiments of the present application have been described in detail with reference to the accompanying drawings. It should be noted that any implementations not depicted or described in the drawings or the main text of the specification are known to those skilled in the art and are not described in detail. Furthermore, the definitions of the various components described above are not limited to the specific structures, shapes, or methods described in the embodiments; those skilled in the art may easily modify or replace them.

[0061] Those skilled in the art will appreciate that various combinations and / or combinations of features described in the various embodiments and / or claims of this application may be made, even if such combinations or combinations are not explicitly described in this application. In particular, various combinations and / or combinations of features described in the various embodiments and / or claims of this application may be made, without departing from the spirit and teachings of this application. All such combinations and / or combinations fall within the scope of this application.

[0062] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of this application. It should be understood that the above is only a specific embodiment of this application and is not intended to limit this application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application should be included in the scope of protection of this application.

Claims

1. A non-magnetic energy-saving forced convection heating furnace, characterized in that: include: Venturi assembly, including: A base having an internal accommodation space, wherein a first inlet and a second inlet are provided on the base, wherein the first inlet is used for inputting air at normal temperature; a conduit, disposed in the accommodating space, one end of the conduit being in communication with the first inlet; a nozzle connected to the other end of the conduit; and A venturi tube body, comprising an inlet section, a contraction section, a throat, and a diffusion section in sequence, wherein the inlet section is sealedly connected to the base, wherein the output end of the nozzle extends into the contraction section and is disposed adjacent to the throat; a heating device in communication with the diffusion section; and The heating chamber is isolated from the heating device, the third inlet of the heating chamber is connected to the heating device, the heating chamber is provided with a first outlet and a second outlet, and the second outlet is connected to the second inlet.

2. The non-magnetic energy-saving forced convection heating furnace according to claim 1, characterized in that: Also includes: An air compressor is communicated with the first inlet and is used to input the normal temperature air.

3. The non-magnetic energy-saving forced convection heating furnace according to claim 1, characterized in that: The accommodating space is a cylindrical space, one end of the accommodating space is provided with an opening that is sealed and connected to the inlet section, and the other end of the accommodating space is provided with the first inlet.

4. The non-magnetic energy-saving forced convection heating furnace according to claim 3, characterized in that: The second inlet is provided on a side surface of the base.

5. The non-magnetic energy-saving forced convection heating furnace according to claim 1, characterized in that: The output end of the nozzle is a conical surface, and the cone angle of the conical surface is equal to the cone angle of the contraction section.

6. The non-magnetic energy-saving forced convection heating furnace according to claim 5, characterized in that: The distance between the tip of the nozzle and the inner wall of the throat of the venturi tube body ranges from 5 to 10 mm.

7. The non-magnetic energy-saving forced convection heating furnace according to claim 1, characterized in that: The inner side wall of the other end of the conduit is provided with an internal thread, and the outer side wall of the nozzle is provided with an external thread adapted to the internal thread. The inner side wall of the root of the internal thread of the conduit extends inwardly in the radial direction to form a stepped structure. The diameter of the portion of the conduit located above the stepped structure is larger than the diameter of the portion located below the stepped structure. The stepped structure is configured to form an airtight seal with the end face of the nozzle.

8. The non-magnetic energy-saving forced convection heating furnace according to claim 1, characterized in that: The cone angle of the diffusion section of the venturi tube body is smaller than the cone angle of the contraction section.

9. The non-magnetic energy-saving forced convection heating furnace according to claim 1, characterized in that: The distance between the throat and the port of the contraction section of the venturi body is smaller than the distance between the throat and the port of the divergence section.

10. The non-magnetic energy-saving forced convection heating furnace according to claim 1, characterized in that: The heating device includes a tubular heater.

11. The non-magnetic energy-saving forced convection heating furnace according to claim 10, characterized in that: Also includes: A temperature sensor is provided in the heating chamber to obtain the temperature of the gas or the object to be heated in the heating chamber; as well as A controller is connected to the heating device and the temperature sensor respectively.

12. The non-magnetic energy-saving forced convection heating furnace according to claim 1, characterized in that: The base is made of metal material through computer digital controlled precision machining.

13. The non-magnetic energy-saving forced convection heating furnace according to claim 1, characterized in that: The base is sealed and connected to the inlet section via a socket.

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