Air-cooled vacuum furnace capable of rapidly circulating cold air

Abstract

The utility model relates to the technical field of vacuum furnaces, in particular to an air-cooled vacuum furnace capable of quickly circulating cold air, which comprises a furnace body, a circulating air pipe is arranged on the furnace body, two ends of the circulating air pipe are respectively used as an air inlet end and an air outlet end which are communicated with the inside of the furnace body, and a refrigerating machine is arranged on the circulating air pipe. A circulating pump for providing conveying power for the cold air is further arranged on the circulating air pipe, an air direction changing assembly for periodically changing the conveying direction of the cold air is arranged between the air inlet end and the furnace body, and the air inlet end is communicated with the interior of the furnace body through the air direction changing assembly. The utility model aims to solve the technical problems that the cooling of the furnace body is not uniform enough and the cooling effect is poor because the cold air is directly blown to a certain fixed position in the furnace body from the air outlet pipe diameter and the direction of the cold air cannot be changed.

Description

Technical Field

[0001] The utility model relates to the technical field of vacuum furnaces, in particular to an air-cooled vacuum furnace capable of rapidly circulating cold air. Background Art

[0002] A vacuum furnace is an industrial furnace that uses a vacuum system to make the furnace chamber pressure less than a standard atmospheric pressure during operation, thereby achieving a certain degree of vacuum. Since the furnace chamber can have a vacuum environment, the vacuum furnace has the advantages of no impurities, no pollution, low energy consumption, and easy temperature control. However, the existing vacuum furnace has the following problems:

[0003] 1. The existing vacuum furnace equipment does not have a good cooling function, cannot be quickly cycled, and has low working efficiency;

[0004] 2. The cooling function of the existing vacuum furnace equipment is too simple. Generally, when cooling by air cooling, the quality of cold air circulation is not very high, which affects the cooling effect.

[0005] In order to solve the above problems, a Chinese utility model patent discloses an air-cooled vacuum furnace that can quickly circulate cold air (publication number: CN211177971U), which includes a base, a support frame is fixedly connected to the top of the base, a box is fixedly connected to the top of the support frame, a vacuum furnace body is fixedly connected to the inner bottom wall of the box, a fixed plate is fixedly connected to one side of the box, an air outlet box is fixedly connected to the top of the fixed plate, an air outlet box is fixedly connected to one side of the air outlet box, an air blowing pipe is fixedly connected to the side of the box away from the air outlet box.

[0006] Although the above patent increases the cooling effect, when the cold air enters the furnace body, it blows directly from the air outlet pipe to a fixed position in the furnace body, and the wind direction of the cold air cannot be changed, which makes the cooling of the furnace body uneven and reduces the cooling effect. Utility Model Content

[0007] In view of this, the purpose of the utility model is to provide an air-cooled vacuum furnace that can quickly circulate cold air, so as to solve the technical problem that the cold air is blown directly from the air outlet pipe to a fixed position in the furnace body, and the wind direction of the cold air cannot be changed, thereby resulting in uneven cooling of the furnace body and poor cooling effect.

[0008] The utility model is realized by the following technical solutions:

[0009] An air-cooled vacuum furnace capable of rapidly circulating cold air comprises a furnace body, wherein a circulating air pipe is arranged on the furnace body, wherein both ends of the circulating air pipe are connected to the interior of the furnace body as an air inlet end and an air outlet end respectively, wherein a refrigerator is arranged on the circulating air pipe, and wherein a circulating pump for providing conveying power for the cold air is also arranged on the circulating air pipe, wherein a wind direction changing component for periodically changing the conveying direction of the cold air is arranged between the air inlet end and the furnace body, and wherein the air inlet end is connected to the interior of the furnace body via the wind direction changing component.

[0010] Furthermore, the wind direction changing assembly includes a first installation shell, the first installation shell is a hollow cylindrical structure with one end open, the first installation shell is connected to the air inlet end at the end away from the open end, and is connected to the interior of the furnace body at the end close to the open end;

[0011] A cylindrical guide column is rotatably fitted inside the first mounting shell. The guide column is arranged along the length direction of the first mounting shell and the outer wall of the guide column is against the inner wall of the first mounting shell. The outer wall of the guide column is provided with a spiral groove extending spirally along the length direction of the guide column, and both ends of the spiral groove extend outside the two ends of the guide column. The gas flows in the spiral groove to provide a rotational driving force for the guide column.

[0012] Furthermore, a funnel-shaped accelerator is provided between the first mounting shell and the air inlet end, wherein the large end of the accelerator is connected to the air inlet end, and the small end of the accelerator is connected to an end of the first mounting shell away from the open end.

[0013] Furthermore, the wind direction changing assembly includes a second mounting shell, the second mounting shell is a hollow tubular structure with one end open, the end of the second mounting shell away from the open end is connected to the air inlet end, and the end close to the open end is connected to the interior of the furnace body;

[0014] At least one fan blade is arranged inside the second mounting shell, and a rotating shaft is arranged on the fan blade, and the fan blade is rotatably connected to the second mounting shell through the rotating shaft. A gear is arranged on the second mounting shell, and the gear is coaxially connected to the rotating shaft. A rack that meshes with the gear is slidably matched on the second mounting shell, and a driving device for driving the rack to slide back and forth is arranged on the second mounting shell.

[0015] Further, the driving device includes a transmission rod, a disc and a driving motor mounted on the second mounting housing;

[0016] The transmission rod is arranged between the disc and the rack, one end of the transmission rod is hinged to one end of the rack, and the other end is hinged to the eccentric position of the top of the disc. The disc is fixedly connected to the output shaft of the driving motor and is coaxially arranged.

[0017] Further, the driving device includes a cam and a driving motor installed on the second mounting housing, the cam is fixedly connected to the output shaft of the driving motor, the outer side wall of the cam is a pushing surface, the rack is provided with an arc portion near one end of the cam, and the outer side wall of the arc portion abuts against the pushing surface;

[0018] The second mounting shell is provided with an elastic member for pressing the arc-shaped portion tightly against the pushing surface.

[0019] The beneficial effects of the utility model are:

[0020] The invention discloses an air-cooled vacuum furnace capable of rapidly circulating cold air. By arranging a wind direction changing component, the cold air can flow in the furnace body along different paths, and the cold air delivery direction will show periodic changes. Such periodic wind direction changes are helpful to improve the uniformity of temperature distribution inside the furnace body and reduce the occurrence of local overheating or overcooling.

[0021] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and will be apparent to those skilled in the art based on the following examination and research, or can be taught from the practice of the present invention to some extent. The objectives and other advantages of the present invention can be achieved and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present utility model;

[0023] Figure 2 for Figure 1 The cross-sectional structure of Figure 1 ;

[0024] Figure 3 This is a schematic diagram of the structure of Embodiment 2 of the present utility model;

[0025] Figure 4 This is a schematic diagram of the structure of Example 3 of the utility model.

[0026] In the figure: air intake end 1, first mounting shell 21, guide column 22, spiral groove 23, accelerator 24, second mounting shell 31, fan blade 32, rotating shaft 33, gear 34, rack 35, clamping strip 36, driving device 37, driving motor 371, disc 3721, transmission rod 3722, cam 3731, elastic member 3732. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0030] In the above description of the utility model, it should be noted that the terms "one side", "the other side", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model 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 the utility model. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0031] In addition, the term "same" does not mean that the parts must be absolutely the same, but slight differences are allowed. The term "vertical" only means that the positional relationship between the parts is more vertical than "parallel", and does not mean that the structure must be completely vertical, but can be slightly tilted.

[0032] See also Figure 1-4The utility model provides a technical solution: an air-cooled vacuum furnace capable of rapidly circulating cold air, comprising a furnace body, a main structure for heat treatment and chemical reaction of the furnace body, a certain temperature environment needs to be maintained inside the furnace body to meet the process requirements, a circulating air pipe is arranged on the furnace body, and both ends of the circulating air pipe are connected to the inside of the furnace body as an air inlet end 1 and an air outlet end respectively, and the function of the circulating air pipe is to form a circulation loop of cold air, and to adjust the temperature inside the furnace body by continuously conveying cold air into the furnace body, a refrigerator is arranged on the circulating air pipe, and the main function of the refrigerator is to generate and maintain cold air at a certain temperature, and a circulating pump providing conveying power for the cold air is also arranged on the circulating air pipe, and the circulating pump provides the necessary conveying power for the cold air to ensure that the cold air can smoothly enter from the air inlet end 1 The air enters the furnace body and is then discharged from the air outlet to form a complete cycle. A wind direction changing component for periodically changing the direction of cold air delivery is arranged between the air inlet end 1 and the furnace body. The air inlet end 1 is connected to the inside of the furnace body through the wind direction changing component. The wind direction changing component can periodically change the delivery direction of cold air. Specifically, when the wind direction changing component is in a certain state, cold air enters the furnace body from the air inlet end 1 and flows along a set path. When the wind direction changing component is switched to another state, the delivery direction of cold air will change accordingly, so that the cold air can flow in the furnace body along different paths, and its cold air delivery direction will show periodic changes. This periodic change in wind direction helps to improve the uniformity of temperature distribution inside the furnace body and reduce the occurrence of local overheating or overcooling.

[0033] Example 1, please refer to Figure 1 and 2 The wind direction changing component includes a first installation shell 21, which is a hollow cylindrical structure with one end open. The end of the first installation shell 21 away from the open end is connected to the air inlet end 1, and the end close to the open end is connected to the inside of the furnace body. The non-open end (i.e., the closed end) of the first installation shell 21 is closely connected to the air inlet end 1 of the circulating air pipe, ensuring that the cold air can enter the first installation shell 21 without hindrance, and then can be discharged into the furnace body from the open end;

[0034] A cylindrical guide column 22 is rotatably mounted inside the first mounting shell 21. The guide column 22 is arranged along the length direction of the first mounting shell 21 and the outer side wall of the guide column 22 is against the inner side wall of the first mounting shell 21. The guide column 22 is coaxially arranged with the first mounting shell 21 and can rotate along the axis. The outer side wall of the guide column 22 is tightly against the inner side wall of the first mounting shell 21 to reduce gas leakage and increase the rotation stability of the guide column 22. A spiral groove 23 is provided on the outer side wall of the guide column 22, which spirally extends along the length direction of the guide column 22, and both ends of the spiral groove 23 extend outside the two ends of the guide column 22. The two ends of the spiral groove 23 extend outside the two ends of the guide column 22, so that it can be ensured that the gas can smoothly enter and leave the spiral groove 23, and the gas flows in the spiral groove 23 to provide a rotational driving force for the guide column 22, specifically, the tangential force generated when the gas flows in the spiral groove 23 is used to drive the guide column 22 to rotate.

[0035] When cold air enters the first mounting shell 21 from the air inlet end 1, part of the cold air will enter the spiral groove 23 and flow along the trajectory of the spiral groove 23. Due to the spiral shape of the spiral groove 23, the cold air will generate a tangential force during the flow. This tangential force will act on the guide column 22 and drive it to rotate. As the guide column 22 rotates, the opening direction of the spiral groove 23 will also change periodically. In this way, the direction of the cold air flowing out of the spiral groove 23 will also change periodically with the rotation of the guide column 22, thereby realizing the periodic change of wind direction. This periodic change of wind direction helps to improve the gas flow state inside the furnace body and improve the uniformity of temperature distribution.

[0036] In this embodiment: in order to more effectively promote the rotation of the guide column 22, a funnel-shaped accelerator 24 is arranged between the first mounting shell 21 and the air inlet end 1, the large end of the accelerator 24 is connected to the air inlet end 1, and the small end is connected to the end of the first mounting shell 21 away from the open end.

[0037] Through the funnel-shaped design of the accelerator 24, the gas will be gradually compressed and accelerated in the process of passing through the accelerator 24. This is because the flow rate of the gas will increase when passing through a pipe with a smaller cross-section (based on the continuity principle and Bernoulli equation in fluid mechanics), and the increase in the cold gas flow rate will more effectively promote the rotation of the guide column 22.

[0038] Preferably, the large end of the accelerator 24 is directly connected to the air inlet end 1 to form a smooth transition and reduce the resistance and vortex during gas flow.

[0039] Example 2, please refer to Figure 3The difference between Example 2 and Example 1 lies in the difference in the wind direction changing assembly. Specifically, the wind direction changing assembly includes a second mounting shell 31. The second mounting shell 31 is a hollow tubular structure with one end open. The end of the second mounting shell 31 away from the open end is connected to the air inlet end 1, so that the external airflow can enter the second mounting shell 31. The end close to the open end is connected to the interior of the furnace body, and the regulated airflow can be guided from the interior of the second mounting shell 31 to the furnace.

[0040] At least one fan blade 32 is arranged inside the second installation shell 31. The fan blade 32 is a key component for changing the direction of the airflow. The change of the airflow direction is achieved by changing the angle of the fan blade 32. The number of the fan blades 32 is not limited. The specific number is determined by the internal size of the second installation shell 31. When the wind guide surface of the fan blade 32 is perpendicular to the gas flow direction of the second installation shell 31, it is preferable to block the airflow to a large extent. The fan blade 32 is provided with a rotating shaft 33. The rotating shaft 33 should be fixedly connected to the fan blade 32. The specific fixed connection method is not limited, such as riveting, The fan blade 32 is rotatably connected to the second mounting housing 31 through the rotating shaft 33, and the rotation of the rotating shaft 33 will drive the fan blade 32 to rotate. The second mounting housing 31 is provided with a gear 34, and the gear 34 is coaxially connected to the rotating shaft 33, so that the rotation of the fan blade 32 will rotate synchronously with the gear 34. The second mounting housing 31 is slidably matched with a rack 35 meshing with the gear 34. The sliding of the rack 35 will drive the gear 34 to rotate, thereby driving the fan blade 32 to rotate. The rack 35 and the second mounting housing 3 1 adopts a sliding fit between them, so that the rack 35 can slide back and forth smoothly. The specific sliding fit form is not limited to the smooth sliding of the rack 35. For example, the sliding fit form of the existing slideway slider can be adopted. In this embodiment, the top of the second mounting shell 31 has a plane for placing the rack 35. The rack 35 is placed flat on the plane. The gear 34 is also installed on the plane and meshes with the rack 35. The rack 35 is provided with a clip 36 with an L-shaped cross section on one side relative to the gear 34. The clip 36 is in the shape of a long strip and The length direction is consistent with the length direction of the rack 35. The clip 36 is fixedly connected to the plane, and the inner wall of the clip 36 is against the outer wall of the rack 35. The rack 35 can slide smoothly along the clip 36. The second mounting shell 31 is provided with a driving device 37 for driving the rack 35 to slide back and forth. Through the operation of the driving device 37, the rack 35 is periodically pushed toward and pulled away from the gear 34, so that the gear 34 and the fan blades 32 produce periodic rotational motion, and the periodic rotation of the fan blades 32 periodically changes the direction of the airflow.

[0041] In this embodiment: the driving device 37 includes a transmission rod 3722, a disc 3721 and a driving motor 371 installed on the second installation housing 31;

[0042] Among them, the transmission rod 3722 is arranged between the disc 3721 and the rack 35, one end of the transmission rod 3722 is hinged to one end of the rack 35, and the other end is hinged to the eccentric position of the top of the disc 3721. The disc 3721 is a circular component, and its top eccentric position is hinged to the transmission rod 3722. When the disc 3721 rotates, due to the existence of the eccentric position, the transmission rod 3722 will be driven to swing back and forth. The disc 3721 is fixedly connected to the output shaft of the driving motor 371 and is coaxially arranged. The driving motor 371 provides a power source for the disc 3721, and drives the disc 3721 to rotate by rotating its output shaft.

[0043] When the driving motor 371 is started, its output shaft starts to rotate and drives the disc 3721 fixedly connected thereto to rotate synchronously. Since the eccentric position at the top of the disc 3721 is hinged to the transmission rod 3722, when the disc 3721 rotates, the transmission rod 3722 will swing around the hinge point between it and the disc 3721. This swinging motion is transmitted to the rack 35 through the other end of the transmission rod 3722, causing the rack 35 to slide back and forth in a straight line. Since the rack 35 is meshed with the gear 34, the reciprocating sliding of the rack 35 will drive the gear 34 to rotate periodically. The rotation of the gear 34 in turn drives the fan blades 32 to rotate through the rotating shaft 33, thereby finally realizing the periodic change of wind direction.

[0044] Example 3, please refer to Figure 4 , the difference between Example 3 and Example 2 lies in the difference in the driving device 37. The driving device 37 includes a cam 3731 and a driving motor 371 installed on the second mounting shell 31. The cam 3731 is fixedly connected to the output shaft of the driving motor 371. The outer wall of the cam 3731 is a pushing surface. The rack 35 is provided with an arc portion near one end of the cam 3731. The outer wall of the arc portion is against the pushing surface. The cam 3731 is a rotating body with a specific contour curve. When the cam 3731 rotates, the pushing surface will contact the arc portion of the rack 35 and push it to move, so that it makes a linear reciprocating motion. The driving motor 371 provides a power source for the rotation of the cam 3731. The driving motor 371 drives the cam 3731 to rotate by driving the output shaft to rotate;

[0045] The second mounting shell 31 is provided with an elastic member 3732 for pressing the arc portion tightly against the push surface. The main function of the elastic member 3732 is to press the arc portion of the rack 35 tightly against the push surface of the cam 3731 to ensure close contact and stable transmission between the two. It should be noted that the elastic member 3732 can be a spring, an elastic sheet, or other elastic components known to those skilled in the art and capable of pressing the arc portion tightly against the pushing surface. In the present embodiment, the elastic member 3732 is an elastic sheet, which is a long strip-shaped structure. This shape causes the elastic sheet to bend and deform when subjected to pressure, thereby storing and releasing elastic potential energy. One end of the elastic sheet is fixedly connected to the second mounting shell 31, and this fixing method can be bolt connection, welding or other reliable connection methods. The other end extends toward the end of the rack 35 away from the cam 3731 and abuts against the end of the rack 35 away from the cam 3731. In this way, when the rack 35 is pushed by the cam 3731, the elastic sheet will provide a reverse force to maintain close contact between the rack 35 and the cam 3731. It should be noted that when the rack 35 moves away from the elastic sheet to the maximum extent, the elastic sheet is still in a stressed state, so that within the entire rotation cycle of the cam 3731, the arc portion can be tightly pressed against the pushing surface.

[0046] When the driving motor 371 is started, its output shaft starts to rotate and drives the cam 3731 fixedly connected thereto to rotate synchronously. The rotation of the cam 3731 causes its pushing surface to contact the arc-shaped portion of the rack 35 and generate a thrust. This thrust will push the rack 35 to slide in a straight line. As the cam 3731 continues to rotate, the pushing surface will gradually separate from the arc-shaped portion. At this time, the elastic sheet will release the stored elastic potential energy and push the rack 35 to move in the opposite direction. Over and over again, the rack 35 will slide back and forth. Since the rack 35 meshes with the gear 34 during the reciprocating sliding process, the gear 34 is driven to rotate periodically. The rotation of the gear 34 drives the fan blades 32 to rotate through the rotating shaft 33, thereby realizing the periodic change of wind direction.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. An air-cooled vacuum furnace capable of rapidly circulating cold air, comprising a furnace body, a circulating air pipe disposed on the furnace body, two ends of the circulating air pipe respectively serving as an air inlet end and an air outlet end both being connected to the interior of the furnace body, a refrigerator disposed on the circulating air pipe, and a circulating pump disposed on the circulating air pipe for providing conveying power for the cold air, characterized in that: A wind direction changing component for periodically changing the cold air delivery direction is arranged between the air inlet end and the furnace body, and the air inlet end is connected with the interior of the furnace body through the wind direction changing component.

2. The air-cooled vacuum furnace capable of rapidly circulating cold air according to claim 1, characterized in that: The wind direction changing assembly comprises a first mounting shell, which is a hollow cylindrical structure with one end open, the end of the first mounting shell away from the open end is connected to the air inlet end, and the end close to the open end is connected to the interior of the furnace body; A cylindrical guide column is rotatably fitted inside the first mounting shell. The guide column is arranged along the length direction of the first mounting shell and the outer wall of the guide column is against the inner wall of the first mounting shell. The outer wall of the guide column is provided with a spiral groove extending spirally along the length direction of the guide column, and both ends of the spiral groove extend outside the two ends of the guide column. The gas flows in the spiral groove to provide a rotational driving force for the guide column.

3. The air-cooled vacuum furnace capable of rapidly circulating cold air according to claim 2, characterized in that: A funnel-shaped accelerator is arranged between the first installation shell and the air inlet end. The large end of the accelerator is connected to the air inlet end, and the small end is connected to the end of the first installation shell away from the open end.

4. The air-cooled vacuum furnace capable of rapidly circulating cold air according to claim 1, characterized in that: The wind direction changing assembly comprises a second mounting shell, the second mounting shell is a hollow tubular structure with one end open, the end of the second mounting shell away from the open end is connected to the air inlet end, and the end close to the open end is connected to the interior of the furnace body; At least one fan blade is arranged inside the second mounting shell, and a rotating shaft is arranged on the fan blade, and the fan blade is rotatably connected to the second mounting shell through the rotating shaft. A gear is arranged on the second mounting shell, and the gear is coaxially connected to the rotating shaft. A rack that meshes with the gear is slidably matched on the second mounting shell, and a driving device for driving the rack to slide back and forth is arranged on the second mounting shell.

5. The air-cooled vacuum furnace capable of rapidly circulating cold air according to claim 4, characterized in that: The driving device comprises a transmission rod, a disc and a driving motor mounted on a second mounting housing; The transmission rod is arranged between the disc and the rack, one end of the transmission rod is hinged to one end of the rack, and the other end is hinged to the eccentric position of the top of the disc. The disc is fixedly connected to the output shaft of the driving motor and is coaxially arranged.

6. The air-cooled vacuum furnace capable of rapidly circulating cold air according to claim 4, characterized in that: The driving device comprises a cam and a driving motor mounted on a second mounting housing, the cam is fixedly connected to an output shaft of the driving motor, an outer side wall of the cam is a pushing surface, an arc portion is arranged near one end of the rack near the cam, and an outer side wall of the arc portion abuts against the pushing surface; The second mounting shell is provided with an elastic member for pressing the arc-shaped portion tightly against the pushing surface.

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