Muffle furnace and protection device for heating rod of muffle furnace

Abstract

The utility model relates to a muffle furnace and a protective device of a heating rod of the muffle furnace, the protective device of the heating rod comprises a barrel body, and the muffle furnace comprises a furnace body, the heating rod and the protective device of the heating rod. In the actual installation and use process of the protection device of the heating rod, the inside of the barrel is communicated with the furnace cavity of the furnace body through the one-way valve, so that gas in the barrel flows towards the furnace cavity of the furnace body in a one-way mode, and therefore it can be guaranteed that heat generated by the heating rod can be transmitted to the furnace cavity of the furnace body on the premise that the heating rod is protected; and the temperature control function of the muffle furnace foundation is realized. According to the protection device for the heating rod, the heating rod is sleeved and protected through the barrel, it is guaranteed that heat generated by the heating rod can be transmitted to the furnace cavity of the furnace body through the one-way valve, meanwhile, corrosive gas is prevented from making contact with the heating rod, and the heating rod is further protected.

Description

Technical Field

[0001] The present application relates to the technical field of heating devices, and in particular to a protective device for a muffle furnace and a heating rod thereof. Background Art

[0002] Box-type muffle furnaces currently available on the market use heating methods such as resistance wire heating, silicon carbon rod heating, and silicon molybdenum rod heating. In the lithium-ion battery recycling industry, whether drying electrolytes or pyrolyzing electrodes, the gases generated during the heating process often contain HF. In heating scenarios where acidic or alkaline gases are generated during the heating process, these gases react with the heating rods installed in the muffle furnace, causing them to become brittle and ineffective.

[0003] The prior art protection technology for the heating rod of the muffle furnace mainly involves sheathing a protective sleeve on the outside of the heating rod. However, this method reduces the efficiency of heat exchange between the heating rod and the furnace of the muffle furnace. Utility Model Content

[0004] Based on this, it is necessary to provide a protective device for a muffle furnace and its heating rod to address the problem that the protective cover on the outside of the heating rod in the prior art reduces the heat exchange efficiency between the heating rod and the furnace of the muffle furnace.

[0005] A heating rod protection device is used to protect the heating rod of a muffle furnace, wherein the heating rod is connected to the inner wall of the furnace body of the muffle furnace, and the heating rod protection device includes a cylinder, which is sleeved on the heating rod so that the gas inside the cylinder is heated by the heating rod, and the two ends of the cylinder are respectively connected to the two inner walls of the furnace body;

[0006] A one-way valve is provided on the side wall of the cylinder, and the one-way valve connects the interior of the cylinder with the furnace cavity of the furnace body, so that the gas heated by the heating rod inside the cylinder flows into the furnace cavity of the furnace body in a one-way manner.

[0007] In one embodiment, the cylinder includes a guide plate and a plurality of protective plates; the one-way valve includes a plurality of Tesla flow channels;

[0008] The guide plate and the plurality of protective plates are connected end to end in sequence around the circumference of the cylinder, and the two ends of the guide plate along the circumference of the cylinder are detachably connected to the corresponding protective plates respectively;

[0009] The Tesla flow channel is provided on the guide plate, and the protective plate connected to the guide plate is located on the outside of the guide plate and covers the inflow end of the Tesla flow channel. The outflow end of the Tesla flow channel is staggered with the protective plate so that the outflow end is connected with the furnace cavity.

[0010] In one embodiment, the cylinder includes five protective plates, namely a first plate, a second plate, a third plate, a fourth plate, and a fifth plate connected end to end in sequence, and the guide plate includes a sixth plate and a seventh plate connected thereto, and the sixth plate and the seventh plate are both provided with a plurality of Tesla flow channels;

[0011] The sixth plate and the seventh plate are arranged at a first angle, the first plate and the fifth plate are arranged at a second angle, and the first angle is equal to the second angle;

[0012] The first plate is detachably connected to the sixth plate and covers the inflow end of the Tesla flow channel;

[0013] The fifth plate is detachably connected to the seventh plate and covers the inflow end of the Tesla flow channel.

[0014] In one embodiment, the sixth plate is located on a side of the first plate close to the fifth plate. The Tesla flow channel opened on the side of the sixth plate close to the first plate is defined as a first Tesla flow channel. The first plate covers the inflow end of the first Tesla flow channel. The inflow end of the first Tesla flow channel is connected to the interior of the cylinder, and the outflow end of the first Tesla flow channel is connected to the furnace cavity of the furnace body.

[0015] The seventh plate is located on the side of the fifth plate close to the first plate. The Tesla flow channel opened on the side of the seventh plate close to the fifth plate is defined as the second Tesla flow channel. The fifth plate covers the inlet end of the second Tesla flow channel. The inlet end of the second Tesla flow channel is connected to the interior of the cylinder, and the outflow end of the second Tesla flow channel is connected to the furnace cavity of the furnace body.

[0016] In one embodiment, the end surface of the sixth plate facing away from the seventh plate is provided with an inlet end of the first Tesla flow channel, and the outlet end of the first Tesla flow channel is spaced apart from the seventh plate.

[0017] An inflow end of the second Tesla flow channel is formed on an end surface of the seventh plate facing away from the sixth plate, and an outflow end of the second Tesla flow channel is spaced apart from the sixth plate.

[0018] In one embodiment, the plurality of first Tesla flow channels and the plurality of second Tesla flow channels are uniformly arranged along the axial direction of the heating rod, and the flow directions of the first Tesla flow channels and the second Tesla flow channels are perpendicular to the axial direction of the heating rod.

[0019] In one embodiment, the protective device for the heating rod further comprises a plurality of first fasteners and a plurality of second fasteners, the first plate is provided with a plurality of first holes, the fifth plate is provided with a plurality of second holes, the sixth plate is provided with a plurality of third holes, and the seventh plate is provided with a plurality of fourth holes;

[0020] The first fasteners are passed through the first holes and the third holes in a one-to-one correspondence, and the second fasteners are passed through the second holes and the fourth holes in a one-to-one correspondence.

[0021] In one embodiment, the cylinder is provided with a vent hole for introducing an inert gas into the interior of the cylinder.

[0022] In one embodiment, the first angle is 60°-150°.

[0023] An embodiment of the present application further provides a muffle furnace, comprising: a furnace body, a heating rod, and a protective device for the heating rod;

[0024] The two ends of the heating rod are respectively connected to the two opposite inner walls of the furnace body. The protective device of the heating rod is sleeved on the outer circumference of the heating rod. The two ends of the protective device of the heating rod are respectively connected to the two opposite inner walls of the furnace body.

[0025] During the actual installation and use of the protective device for the heating rod mentioned above, the cylinder is first sleeved on the heating rod, and then the two ends of the cylinder are respectively connected to the two inner walls of the furnace body to complete the installation of the protective device for the heating rod. During the operation of the heating rod, the one-way valve connects the inside of the cylinder with the furnace cavity of the furnace body, so that the gas inside the cylinder flows one-way to the furnace cavity of the furnace body. Therefore, it can ensure that the heat generated by the heating rod can be transferred to the furnace cavity of the furnace body while protecting the heating rod, thereby realizing the basic temperature control function of the muffle furnace. The protective device for the heating rod mentioned above is sleeved on the cylinder and protects the heating rod, and ensures that the heat generated by the heating rod can be transferred to the furnace cavity of the furnace body through the one-way valve, while preventing corrosive gases from contacting the heating rod, thereby further protecting the heating rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of a heating rod protective device sleeved on the heating rod according to an embodiment.

[0027] Figure 2 for Figure 1 Enlarged view of point A in the middle.

[0028] Figure 3 for Figure 1 Schematic diagram from another perspective.

[0029] Figure 4 for Figure 1 Schematic diagram of the center guide plate.

[0030] Figure 5 for Figure 4 Enlarged view of point B in the middle.

[0031] Description of Figure Numbers:

[0032] 100-protective device for heating rod;

[0033] 110-cylinder; 111-deflector; 112-protection plate; 113-vent;

[0034] 120 - one-way valve; 121 - first Tesla flow channel; 122 - second Tesla flow channel; 123 - inflow end; 124 - outflow end;

[0035] 130 - first plate; 131 - second plate; 132 - third plate; 133 - fourth plate; 134 - fifth plate; 135 - sixth plate; 136 - seventh plate;

[0036] 140-first hole; 141-second hole; 142-third hole; 143-fourth hole;

[0037] 210-Heating rod. DETAILED DESCRIPTION

[0038] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0039] In the description of this application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0040] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, if the term "plurality" appears, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0041] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connected," "fixed," etc., should be interpreted broadly. For example, these terms may refer to fixed connections, removable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; and internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0042] In this application, unless otherwise expressly specified or limited, if a first feature is described as being "above" or "below" a second feature, or similar descriptions, this may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is described as being "above," "above," or "above" a second feature, this may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is described as being "below," "below," or "below" a second feature, this may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0043] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only embodiment.

[0044] The muffle furnace targeted by the present application comprises a furnace body (not shown) and a heating rod 210 . The heating rod 210 is connected to the inner wall of the furnace body. The heating rod protection device 100 is used to protect the heating rod 210 of the muffle furnace.

[0045] See Figure 1 , Figure 1 A schematic structural diagram of a protective device 100 for a heating rod in an embodiment of the present application is shown. The protective device 100 for a heating rod provided in an embodiment of the present application includes a cylinder 110 .

[0046] See Figure 1 and Figure 2In the above-mentioned protective device 100 for the heating rod, the cylinder 110 is sleeved on the heating rod 210 so that the gas inside the cylinder 110 is heated by the heating rod 210, and the two ends of the cylinder 110 are respectively connected to the two inner walls of the furnace body, and a one-way valve 120 is provided on the side wall of the cylinder 110. The one-way valve 120 connects the interior of the cylinder 110 with the furnace cavity of the furnace body, so that the gas inside the cylinder 110 heated by the heating rod 210 flows into the furnace cavity of the furnace body in one direction.

[0047] During the actual installation and use of the above-mentioned heating rod protective device 100, the barrel 110 is first sleeved on the heating rod 210, and then the two ends of the barrel 110 are respectively connected to the two inner walls of the furnace body to complete the installation of the heating rod protective device 100. During the operation of the heating rod 210, the one-way valve 120 connects the interior of the barrel 110 with the furnace cavity of the furnace body, so that the gas inside the barrel 110 flows one-way to the furnace cavity of the furnace body. Therefore, it is possible to ensure that the heat generated by the heating rod 210 can be transferred to the furnace cavity of the furnace body while protecting the heating rod 210, thereby realizing the basic temperature control function of the muffle furnace. The above-mentioned heating rod protective device 100 is sleeved and protected by the barrel 110, and ensures that the heat generated by the heating rod 210 can be transferred to the furnace cavity of the furnace body through the one-way valve 120, while preventing corrosive gases from contacting the heating rod 210, further protecting the heating rod 210.

[0048] See Figure 2 In one embodiment, the cylinder 110 includes a guide plate 111 and a plurality of protective plates 112. The guide plate 111 and the plurality of protective plates 112 are sequentially connected end to end around the circumference of the cylinder 110, and the two ends of the guide plate 111 are detachably connected to the corresponding protective plates 112. This makes it convenient for the cylinder 110 to be installed on the periphery of the heating rod 210 or removed from the furnace body. A Tesla flow channel is provided on the guide plate 111. The protective plate 112 connected to the guide plate 111 is located on the outside of the guide plate 111 and covers the inlet end 123 of the Tesla flow channel. The outlet end 124 of the Tesla flow channel is staggered from the protective plate 112 so that the outlet end 124 is connected to the furnace cavity, thereby forming a one-way valve structure through the above structure. The heat generated by the heating rod 210 can enter the Tesla flow channel through the inlet end 123, and then be transferred to the furnace cavity of the furnace body through the outflow end 124. Compared with the physical valve structure, this structure can realize multi-channel heat transfer by opening multiple Tesla flow channels in the length direction of the guide plate 111, and the structure is simple, all composed of plate-like structures, ensuring that the one-way valve composed of the Tesla flow channels in this application operates stably in a corrosive environment.

[0049] Specifically, the two end faces of the cylinder 110 respectively abut against the two inner walls of the furnace body and seal the openings at both ends, thereby facilitating the cylinder 110 to be installed on the periphery of the heating rod 210 or removed from the furnace body. At the same time, it can ensure that the heating rod 210 or the wiring of the heating rod 210 can extend from the cylinder 110 to the inner wall of the furnace body, ensuring the normal use of the heating rod 210.

[0050] In other embodiments, holes may be formed in two opposing inner walls of the furnace body, with the barrel and heating rod both inserted through the holes. The outer wall of the barrel and the inner wall of the holes are sealed together, and inert gas is introduced and discharged from both ends of the barrel. The barrel and furnace body can be mounted in any manner, as long as the interior of the barrel is isolated from the furnace cavity and only one-way flow is provided by a one-way valve.

[0051] See Figure 2 In one embodiment, the cylinder 110 includes five protective plates 112, namely a first plate 130, a second plate 131, a third plate 132, a fourth plate 133, and a fifth plate 134, which are connected end to end. The guide plate 111 includes a sixth plate 135 and a seventh plate 136, which are connected. The sixth plate 135 and the seventh plate 136 are each provided with a plurality of Tesla flow channels. The sixth plate 135 and the seventh plate 136 are arranged at a first angle, and the first plate 130 and the fifth plate 134 are arranged at a second angle, where the first angle is equal to the second angle. The first plate 130 and the sixth plate 135 are detachably connected and cover the inflow end 123 of the Tesla flow channel. The fifth plate 134 and the seventh plate 136 are detachably connected and cover the inflow end 123 of the Tesla flow channel. Thus, the first plate 130, the second plate 131, the third plate 132, the fourth plate 133, the fifth plate 134, the sixth plate 135 and the seventh plate 136 can be surrounded by a pentagonal prism-shaped cylinder 110, which is designed as a pentagonal prism and is sleeved on the heating rod 210. The specific structure is that the second plate 131 is parallel to the fourth plate 133, the second plate 131 and the fourth plate 133 are perpendicular to the third plate 132 at the same time, the first plate 130 is angled with the second plate 131 and tilted in the direction away from the third plate 132, the fifth plate 134 is angled with the fourth plate 133 and tilted in the direction away from the third plate 132, and the The gap between the first plate 130 and the fifth plate 134 is then closed by the connected sixth plate 135 and seventh plate 136. Compared to the triangular prism form, that is, the protective plate 112 is connected by three plates, this structure is more suitable for the cylindrical heating rod 210, and the size selection and processing are simpler, that is, the width of the second plate 131, the third plate 132, and the fourth plate 133 can be made the same and slightly larger than the outer diameter of the heating rod 210, so that they can be sleeved on the heating rod 210. When calculating the width of the plate in the triangular prism form, even if the equilateral triangular prism is used as an example, the specific width calculation is relatively complicated. Compared to the hexagonal prism and above cylinder 110 forms, the pentagonal prism form has the least number of plates and is easy to process, so it is selected as follows. Figure 1The structure of the barrel 110 shown is designed and processed.

[0052] In other embodiments, the Tesla flow channel may be formed on one of the sixth plate or the seventh plate.

[0053] Preferably, the minimum distance between the first plate 130 and the fifth plate 134 is slightly larger than the outer diameter of the heating rod 210 , so that the connected protection plate 112 can be sleeved on the heating rod 210 or removed from the furnace body.

[0054] See Figure 2 、 Figure 4 as well as Figure 5 In one embodiment, the sixth plate 135 is located on the side of the first plate 130 near the fifth plate 134. The Tesla flow channel defined on the side of the sixth plate 135 near the first plate 130 is defined as the first Tesla flow channel 121. The first plate 130 covers the inlet end 123 of the first Tesla flow channel 121. The inlet end 123 of the first Tesla flow channel 121 communicates with the interior of the barrel 110, while the outlet end 124 of the first Tesla flow channel 121 communicates with the furnace cavity. The seventh plate 136 is located on the side of the fifth plate 134 near the first plate 130. The Tesla flow channel defined on the side of the seventh plate 136 near the fifth plate 134 is defined as the second Tesla flow channel 122. The fifth plate 134 covers the inlet end 123 of the second Tesla flow channel 122. The inlet end 123 of the second Tesla flow channel 122 communicates with the interior of the barrel 110, while the outlet end 124 of the second Tesla flow channel 122 communicates with the furnace cavity. The number of the first Tesla flow channels 121 and the second Tesla flow channels 122 is not limited.

[0055] In this embodiment, taking the first Tesla flow channel 121 as an example, the fifth plate 134 partially covers the first Tesla flow channel 121 and covers the inlet end 123 of the first Tesla flow channel 121, so that the gas atmosphere heated by the heating rod 210 inside the cylinder 110 can enter the first Tesla flow channel 121 through the inlet end 123 of the first Tesla flow channel 121 and flow unidirectionally toward the outlet end 124 of the first Tesla flow channel 121. The portion of the first Tesla flow channel 121 not covered by the fifth plate 134 enters the cavity of the furnace body and dissipates to heat the cavity of the furnace body. During this process, the gas atmosphere inside the furnace cavity of the furnace body will not flow into the cylinder 110, thereby protecting the heating rod 210 and preventing the heating rod 210 from being damaged by corrosive gases. The second Tesla flow channel 122 is similar to the first Tesla flow channel 121 and will not be described in detail here.

[0056] See Figure 2 、 Figure 4 as well as Figure 5In one embodiment, the end surface of the sixth plate 135 facing away from the seventh plate 136 defines the inlet end 123 of the first Tesla flow channel 121, and the outlet end 124 of the first Tesla flow channel 121 is spaced apart from the seventh plate 136. The end surface of the seventh plate 136 facing away from the sixth plate 135 defines the inlet end 123 of the second Tesla flow channel 122, and the outlet end 124 of the second Tesla flow channel 122 is spaced apart from the sixth plate 135.

[0057] In this embodiment, taking the first Tesla channel 121 as an example, the sixth plate 135 directly defines a groove for the first Tesla channel 121 on the end surface facing away from the seventh plate 136, as shown in the figure. The outflow end 124 of the first Tesla channel 121 is spaced apart from the seventh plate 136, i.e., the groove of the first Tesla channel 121 does not extend to the end surface of the sixth plate 135 near the seventh plate 136. The groove of the first Tesla channel 121 does not extend to the seventh plate 136. This allows the gas atmosphere heated by the heating rod 210 within the body assembly to enter the first Tesla channel 121 through the inflow end 123 of the first Tesla channel 121, collide with the inner wall of the groove at the outflow end 124, and dissipate in any direction away from the first Tesla channel 121, rather than directly flowing out of the first Tesla channel along the groove. This allows heat transfer to reach the furnace cavity of the furnace body in a uniform manner, thereby improving heating uniformity. The second Tesla channel 122 is similar to the first Tesla channel 121 and will not be described in detail here.

[0058] In other embodiments, the one-way valve 120 may also be a Tesla valve body instead of a groove of a Tesla flow channel opened on the surface of the guide plate 111, or it may be a gravity one-way valve 120, and the specific form is not limited.

[0059] See Figure 5 In one embodiment, the plurality of first Tesla flow channels 121 and the plurality of second Tesla flow channels 122 are uniformly arranged along the axial direction of the heating rod 210, and the flow directions of the first Tesla flow channels 121 and the second Tesla flow channels 122 are both perpendicular to the axial direction of the heating rod 210. The uniform arrangement of the first Tesla flow channels 121 and the second Tesla flow channels 122 around the circumference of the heating rod 210 enables the heating rod 210 to uniformly heat the furnace cavity. Furthermore, the flow directions of the first Tesla flow channels 121 and the second Tesla flow channels 122 are both perpendicular to the axial direction of the heating rod 210, resulting in a uniform distribution of heat dissipation. This structural design improves heating uniformity.

[0060] See Figure 2In one embodiment, the protective device 100 for the heating rod further includes a plurality of first fasteners (not shown) and a plurality of second fasteners (not shown). The first plate 130 is provided with a plurality of first holes 140, the fifth plate 134 is provided with a plurality of second holes 141, the sixth plate 135 is provided with a plurality of third holes 142, and the seventh plate 136 is provided with a plurality of fourth holes 143. The plurality of first fasteners are provided in a one-to-one correspondence through the plurality of first holes 140 and the plurality of third holes 142, and the plurality of second fasteners are provided in a one-to-one correspondence through the plurality of second holes 141 and the plurality of fourth holes 143. Thus, the guide plate 111 and the plurality of protective plates 112 can be detachably connected via the first and second fasteners. Specifically, the first and second fasteners can be fasteners such as rivets, screws, and bolts.

[0061] See Figure 3 In one embodiment, the barrel 110 is provided with a vent 113 for introducing an inert gas into the barrel 110. This creates an inert gas atmosphere within the assembly, ensuring that the heating rod 210 is in an inert gas atmosphere, further protecting the heating rod 210 while achieving heat transfer.

[0062] Specifically, a vent hole 113 is provided at the center of a side surface of the third plate 132 that is away from the guide plate 111 , so that the inert gas can be introduced more evenly.

[0063] In other embodiments, the third plate 132 is provided with a plurality of vent holes 113 , thereby ensuring an inert gas atmosphere inside the cylinder 110 .

[0064] In one embodiment, the first angle is 60°-150°. This angle range allows the first Tesla flow channel 121 and the second Tesla flow channel 122 on both sides to dissipate heat at a specific angle to both sides. It also makes the structures of the first plate 130, the fifth plate 134, the sixth plate 135, and the seventh plate 136 more reasonable, the installation process more convenient, and is more suitable for installing the barrel 110 around the cylindrical heating rod 210 in the furnace body. It also makes the width calculation process of the above four plates simpler, the processing process more convenient, and improves the efficiency of design, processing, and installation.

[0065] One embodiment of the present application further provides a muffle furnace, comprising a furnace body, a heating rod 210, and a heating rod protection device 100. The heating rod 210 has two ends connected to two opposing inner walls of the furnace body, and the heating rod protection device 100 is sleeved around the outer periphery of the heating rod 210, with the two ends of the heating rod protection device 100 connected to two opposing inner walls of the furnace body.

[0066] During the actual installation and use of the above-mentioned heating rod protective device 100, the barrel 110 is first sleeved on the heating rod 210, and then the two ends of the barrel 110 are respectively connected to the two inner walls of the furnace body to complete the installation of the heating rod protective device 100. During the operation of the heating rod 210, the one-way valve 120 connects the interior of the barrel 110 with the furnace cavity of the furnace body, so that the gas inside the barrel 110 flows one-way to the furnace cavity of the furnace body. Therefore, it is possible to ensure that the heat generated by the heating rod 210 can be transferred to the furnace cavity of the furnace body while protecting the heating rod 210, thereby realizing the basic temperature control function of the muffle furnace. The above-mentioned heating rod protective device 100 is sleeved and protected by the barrel 110, and ensures that the heat generated by the heating rod 210 can be transferred to the furnace cavity of the furnace body through the one-way valve 120, while preventing corrosive gases from contacting the heating rod 210, further protecting the heating rod 210. The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0067] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A heating rod protection device for protecting a heating rod of a muffle furnace, wherein the heating rod is connected to the inner wall of the muffle furnace body, characterized in that: The protective device of the heating rod includes a cylinder, which is sleeved on the heating rod so that the gas inside the cylinder is heated by the heating rod, and the two ends of the cylinder are respectively connected to the two inner walls of the furnace body; A one-way valve is provided on the side wall of the cylinder, and the one-way valve connects the interior of the cylinder with the furnace cavity of the furnace body, so that the gas heated by the heating rod inside the cylinder flows into the furnace cavity of the furnace body in a one-way manner.

2. The protective device for the heating rod according to claim 1, characterized in that: The cylinder includes a guide plate and a plurality of protective plates; the one-way valve includes a plurality of Tesla flow channels; The guide plate and the plurality of protective plates are connected end to end in sequence around the circumference of the cylinder, and the two ends of the guide plate along the circumference of the cylinder are detachably connected to the corresponding protective plates respectively; The Tesla flow channel is provided on the guide plate, and the protective plate connected to the guide plate is located on the outside of the guide plate and covers the inflow end of the Tesla flow channel. The outflow end of the Tesla flow channel is staggered with the protective plate so that the outflow end is connected with the furnace cavity.

3. The protective device for the heating rod according to claim 2, characterized in that: The cylinder includes five protective plates, namely a first plate, a second plate, a third plate, a fourth plate and a fifth plate connected end to end in sequence, and the guide plate includes a sixth plate and a seventh plate connected to each other, and the sixth plate and the seventh plate are both provided with a plurality of Tesla flow channels; The sixth plate and the seventh plate are arranged at a first angle, the first plate and the fifth plate are arranged at a second angle, and the first angle is equal to the second angle; The first plate is detachably connected to the sixth plate and covers the inflow end of the Tesla flow channel; The fifth plate is detachably connected to the seventh plate and covers the inflow end of the Tesla flow channel.

4. The protective device for the heating rod according to claim 3, characterized in that: The sixth plate is located on a side of the first plate close to the fifth plate. The Tesla flow channel opened on the side of the sixth plate close to the first plate is defined as a first Tesla flow channel. The first plate covers the inflow end of the first Tesla flow channel. The inflow end of the first Tesla flow channel is connected to the interior of the cylinder, and the outflow end of the first Tesla flow channel is connected to the furnace cavity of the furnace body. The seventh plate is located on the side of the fifth plate close to the first plate. The Tesla flow channel opened on the side of the seventh plate close to the fifth plate is defined as the second Tesla flow channel. The fifth plate covers the inlet end of the second Tesla flow channel. The inlet end of the second Tesla flow channel is connected to the interior of the cylinder, and the outflow end of the second Tesla flow channel is connected to the furnace cavity of the furnace body.

5. The protective device for the heating rod according to claim 4, characterized in that: The end surface of the sixth plate facing away from the seventh plate is provided with an inflow end of the first Tesla flow channel, and the outflow end of the first Tesla flow channel is spaced apart from the seventh plate; An inflow end of the second Tesla flow channel is formed on an end surface of the seventh plate facing away from the sixth plate, and an outflow end of the second Tesla flow channel is spaced apart from the sixth plate.

6. The protective device for the heating rod according to claim 4, characterized in that: The plurality of first Tesla flow channels and the plurality of second Tesla flow channels are uniformly arranged along the axial direction of the heating rod, and the flow directions of the first Tesla flow channels and the second Tesla flow channels are perpendicular to the axial direction of the heating rod.

7. The protective device for the heating rod according to claim 3, characterized in that: The protective device for the heating rod further includes a plurality of first fasteners and a plurality of second fasteners, the first plate is provided with a plurality of first holes, the fifth plate is provided with a plurality of second holes, the sixth plate is provided with a plurality of third holes, and the seventh plate is provided with a plurality of fourth holes; The first fasteners are passed through the first holes and the third holes in a one-to-one correspondence, and the second fasteners are passed through the second holes and the fourth holes in a one-to-one correspondence.

8. The protective device for the heating rod according to claim 1, characterized in that: The cylinder is provided with a vent hole for introducing inert gas into the interior of the cylinder.

9. The protective device for the heating rod according to claim 3, characterized in that: The first angle is 60°-150°.

10. A muffle furnace, characterized in that: The muffle furnace comprises: a furnace body, a heating rod, and a protective device for the heating rod according to any one of claims 1 to 9; The two ends of the heating rod are respectively connected to the two opposite inner walls of the furnace body. The protective device of the heating rod is sleeved on the outer circumference of the heating rod. The two ends of the protective device of the heating rod are respectively connected to the two opposite inner walls of the furnace body.

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