Intelligent temperature control vacuum drying oven capable of automatically maintaining vacuum degree
By adopting a double-layer inner barrel structure and an automated air pressure control system in the vacuum drying oven, the problems of unstable air pressure and low heat transfer efficiency in the vacuum drying oven are solved, achieving stable air pressure and efficient heat transfer, and improving the safety of use.
Patent Information
- Application Number
- CN202520521488.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-24
- Publication Date
- 2026-03-03
- Estimated Expiration
- 2035-03-24
AI Technical Summary
Existing vacuum drying ovens suffer from unstable air pressure during the vacuuming process, low heat transfer efficiency, cumbersome operation, and potential safety hazards.
It adopts a double-layer inner barrel structure, with the inner barrel sandwiched with a heat-conducting medium. Combined with an electromagnetic master valve and a pressure sensor, it achieves automated pressure control. The mechanical pressure relief valve is interlocked with the chamber cover to improve heat transfer efficiency and pressure stability.
It achieves stable and automated control of the air pressure inside the vacuum drying oven, improves heat transfer efficiency, reduces energy consumption, and enhances safety during use.
Smart Images
Figure CN223965746U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of vacuum drying equipment technology, specifically to an intelligent temperature-controlled vacuum drying oven that maintains a self-sustaining vacuum level. Background Technology
[0002] A vacuum dryer is a device that removes moisture from the internal components of a packaged container by evacuating the air to a predetermined vacuum level. It is specifically designed for drying heat-sensitive, easily decomposed, and easily oxidized substances. It can be filled with inert gas, and can even rapidly dry complex materials. As a vacuum drying device, it is primarily used for vacuum drying of various battery materials in the new energy battery industry, drying and preservation of pharmaceuticals and biological products in the biomedical field, and in the chemical and food industries. It has particularly broad market prospects and application value for products in the research and development stages of universities and research institutions.
[0003] When vacuum drying ovens are used for vacuuming, the control of their pipelines is mostly done manually. Moreover, current vacuum sealing technology cannot achieve absolute sealing, so the air pressure inside the vacuum chamber will fluctuate to some extent. In order to ensure the stability of the air pressure inside the vacuum chamber, it is necessary to manually adjust the closure of the vacuum pipeline during the continuous heating process to maintain the stability of the air pressure inside the vacuum chamber.
[0004] Currently, manually adjusting the vacuum level inside the vacuum chamber is not very timely and can easily cause large fluctuations in the air pressure inside the chamber. In many vacuum drying ovens, the drying plates used to place materials are often suspended, so heat transfer during high-temperature drying is mainly through thermal radiation, which has low heat utilization efficiency and high energy consumption. Therefore, this method does not meet the current needs. To address this, we propose an intelligent temperature-controlled vacuum drying oven that maintains a self-sustaining vacuum level. Summary of the Invention
[0005] This invention provides an intelligent temperature-controlled vacuum drying oven that maintains a self-sustaining vacuum level. It has the beneficial effects of maintaining the pressure inside the drying chamber automatically and efficiently, and improving heat transfer efficiency, thus solving the problems mentioned in the background art.
[0006] This utility model provides the following technical solution: a self-maintaining intelligent temperature-controlled vacuum drying oven, comprising a box body, a vacuum drying barrel disposed inside the box body, a cavity cover for closing the vacuum drying barrel on the box body, a sealing ring for sealing the vacuum drying barrel on the cavity cover, and a control device for maintaining the vacuum state inside the vacuum drying barrel on the box body. The control device includes a solenoid main valve, which is connected to a vacuum pumping pipeline, a pressure measuring pipeline, and a pressure relief pipeline via pipes. One end of the vacuum pumping pipeline is connected to the inside of the vacuum drying barrel, and the other end of the vacuum pumping pipeline is connected to a vacuum pump. The solenoid main valve controls the closed state of the vacuum pumping pipeline to maintain the internal pressure of the vacuum drying barrel. The end of the pressure relief pipeline is connected to a mechanical pressure relief valve. The pressure relief pipeline and the vacuum drying barrel are normally open within the solenoid main valve, and the opening and closing of the pressure relief pipeline is controlled by the closed state of the mechanical pressure relief valve.
[0007] As an optional solution for the self-maintaining vacuum intelligent temperature-controlled vacuum drying oven described in this utility model, the vacuum drying barrel includes a double-layered inner barrel with a heat-conducting medium filled in the interlayer. A drying plate is provided inside the double-layered inner barrel, and the outer wall of the drying plate is in contact with the inner wall of the double-layered inner barrel. An annular heating outer cylinder is provided on the double-layered inner barrel and is fitted onto the outer wall of the double-layered inner barrel. The annular heating outer cylinder transfers heat to the drying plate through the wall of the double-layered inner barrel.
[0008] As an optional solution for the intelligent temperature-controlled vacuum drying oven that maintains a self-sustaining vacuum degree according to the present invention, the drying plate is provided with a clearance groove for avoiding the internal temperature sensor, and the top horizontal plane of the drying plate is higher than the top horizontal plane of the internal temperature sensor.
[0009] As an optional solution for the intelligent temperature-controlled vacuum drying oven that maintains a self-sustaining vacuum degree according to the present invention, the double-layer inner barrel is provided with an internal temperature sensor inserted inside it, and the double-layer inner barrel is also provided with an external temperature sensor placed on its wall.
[0010] As an optional solution for the intelligent temperature-controlled vacuum drying oven that maintains a self-sustaining vacuum, as described in this utility model, a pressure sensor for detecting the internal pressure of the vacuum drying barrel is connected to the pressure measuring pipeline, and the closed state between the pressure sensor and the inside of the vacuum drying barrel in the electromagnetic main valve is normally open.
[0011] As an optional solution for the intelligent temperature-controlled vacuum drying oven that maintains a self-sustaining vacuum degree as described in this utility model, the oven body is further provided with an operation panel for receiving and processing data from the internal temperature sensor, the external temperature sensor, and the air pressure sensor, as well as an integrated control panel for controlling the annular heating outer cylinder and the solenoid main valve.
[0012] As an optional solution for the intelligent temperature-controlled vacuum drying oven that maintains a self-sustaining vacuum degree according to the present invention, the mechanical pressure relief valve is provided with a knob for adjusting its closed state, the knob is located on the outside of the oven body, and the oven body is provided with scale markings for distinguishing the rotation state of the knob.
[0013] As an optional solution for the intelligent temperature-controlled vacuum drying oven that maintains a self-sustaining vacuum degree as described in this utility model, the opening and closing of the cavity cover is mechanically interlocked with the closed state of the mechanical pressure relief valve.
[0014] This utility model has the following beneficial effects:
[0015] 1. In this type of intelligent temperature-controlled vacuum drying oven with manual pressure relief function, the sandwich layer of the double-layer inner barrel is filled with a heat-conducting medium to increase the heat transfer efficiency of the annular heating outer cylinder. At the same time, the outer wall of the solid drying plate is directly attached to the inner wall of the double-layer inner barrel, so as to switch the heat transfer mode from the heat radiation mode as the main mode to the medium transfer mode as the main mode, thereby improving the heat transfer efficiency. Moreover, internal temperature sensors and external temperature sensors are respectively set on the inner and outer sides of the double-layer inner barrel to accurately detect the internal temperature of the double-layer inner barrel and the temperature of the chamber, so as to accurately adjust the temperature.
[0016] 2. In this type of intelligent temperature-controlled vacuum drying oven with manual pressure relief function, the vacuum pump is an external type separate from the oven body. It is connected to the vacuum pumping pipeline inside the vacuum drying barrel through a pipe. During the vacuuming operation, the solenoid main valve controls the closure state of the vacuum pumping pipeline to reduce errors by minimizing manual intervention. Moreover, the pressure sensor is in a normally open state connected to the inside of the vacuum drying barrel through a pressure measuring pipeline, which allows the pressure sensor to monitor the internal pressure of the vacuum drying barrel in real time. The operation panel processes the pressure signal collected by the pressure sensor to control the closure state of the solenoid main valve to automatically and stably maintain the internal pressure of the vacuum drying barrel. This improves the response speed of the vacuum pumping pipeline closure state and avoids excessive fluctuations in the internal pressure of the vacuum drying barrel.
[0017] 3. In this type of intelligent temperature-controlled vacuum drying oven with manual pressure relief function, the knob controls the closing state of the mechanical pressure relief valve. At the same time, the mechanical pressure relief valve is directly connected to the vacuum drying barrel through the pressure relief pipeline, so as to release the air pressure in the vacuum drying barrel manually. The manual pressure relief method is more reliable than the automatic pressure relief method. Moreover, during the release process, because the chamber cover and the pressure relief pipeline are mechanically interlocked, the chamber cover cannot be opened before the air pressure in the vacuum drying barrel is completely released, which improves the safety of use and clarifies the usage specifications. Attached Figure Description
[0018] Figure 1 This is a three-dimensional structural diagram of an intelligent temperature-controlled vacuum drying oven that maintains a self-sustaining vacuum level, according to the present invention.
[0019] Figure 2 This is a top view of the structure of an intelligent temperature-controlled vacuum drying oven that maintains a self-sustaining vacuum level, according to the present invention.
[0020] Figure 3 This is a top view of the control device of this utility model;
[0021] Figure 4 This is a top view of the electromagnetic master valve of this utility model.
[0022] Figure 5 This is a three-dimensional structural diagram of the vacuum drying barrel of this utility model;
[0023] Figure 6 This is a three-dimensional structural diagram of the annular heating outer cylinder of this utility model;
[0024] Figure 7 This is a three-dimensional structural diagram of the double-layer inner barrel of this utility model;
[0025] Figure 8 This is a three-dimensional structural diagram of the drying plate of this utility model.
[0026] In the diagram: 1. Chamber; 10. Control panel; 2. Vacuum drying chamber; 20. Double-layer inner chamber; 21. Drying plate; 22. Annular heating outer cylinder; 200. Internal temperature sensor; 201. External temperature sensor; 210. Clearance groove; 3. Control device; 30. Solenoid main valve; 31. Vacuum pumping line; 32. Pressure measuring line; 33. Pressure relief line; 310. Vacuum pump; 320. Pressure sensor; 330. Mechanical pressure relief valve; 331. Knob; 4. Chamber cover. Detailed Implementation
[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0028] Example 1 aims to address the problem that drying plates used to hold materials in vacuum drying ovens are often suspended, resulting in low heat utilization efficiency during high-temperature drying due to heat transfer primarily occurring through thermal radiation. Please refer to [link to example]. Figure 1 , Figure 3 , Figure 4 , Figure 6 , Figure 7 and Figure 8 A self-maintaining vacuum intelligent temperature-controlled vacuum drying oven includes a chamber body 1, a vacuum drying barrel 2 disposed inside the chamber body 1, a chamber cover 4 for closing the vacuum drying barrel 2 on the chamber body 1, a sealing ring on the chamber cover 4 for sealing the vacuum drying barrel 2, and a control device 3 on the chamber body 1 for maintaining the vacuum state inside the vacuum drying barrel 2. The control device 3 includes a solenoid main valve 30, which is connected to a vacuum pumping pipeline 31, a pressure measuring pipeline 32, and a pressure relief pipeline 33 via pipes. The control device 3 controls the air pressure inside the vacuum drying barrel 2 through the vacuum pumping pipeline 31, the pressure measuring pipeline 32, and the pressure relief pipeline 33. The above are all technical means well known to those skilled in the art and will not be described in detail here.
[0029] The vacuum drying barrel 2 includes a double-layered inner barrel 20 with a heat-conducting medium filling the interlayer. A drying plate 21 is installed inside the inner barrel 20. The outer wall of the drying plate is in contact with the inner wall of the inner barrel 20. An annular heating outer cylinder 22 is provided on the inner barrel 20. The annular heating outer cylinder 22 is fitted onto the outer wall of the inner barrel 20. The annular heating outer cylinder 22 transfers heat to the drying plate 21 through the wall of the inner barrel 20.
[0030] The inner tub 20 is provided with an internal temperature sensor 200 inserted inside it, and the inner tub 20 is also provided with an external temperature sensor 201 placed on its wall. The drying plate 21 is provided with a clearance groove 210 for avoiding the internal temperature sensor 200, and the top horizontal plane of the drying plate 21 is higher than the top horizontal plane of the internal temperature sensor 200.
[0031] In this embodiment: the drying plate 21 uses a thermally conductive aluminum base with a thermal conductivity coefficient ≥237W / m·K; the medium filled in the vacuum interlayer of the double-layer inner barrel 20 of the single-end open cylindrical vacuum cavity is ceramic fiber; the material of the double-layer inner barrel 20 is 304 stainless steel; both the internal temperature sensor 200 and the external temperature sensor 201 are PT100 temperature sensors; the annular heating outer cylinder 22 uses an annular nickel-chromium alloy heating belt with a heating range of 0-200W. During the heating operation, the heat generated by the annular heating outer cylinder 22 is directly transferred to the double-layer inner barrel 20, and then directly transferred to the inner wall of the double-layer inner barrel 20. The thermally conductive aluminum base, i.e. the drying plate 21, replaces the heat transfer method that is mainly based on thermal radiation in the existing vacuum drying oven with a more efficient medium transfer method, thereby increasing the transfer efficiency and saving the time required for heating. During high-temperature drying operations, the internal temperature sensor 200 and the external temperature sensor 201 detect the temperature on the inner and outer sides of the vacuum drying barrel 2, respectively. By adjusting the annular heating outer cylinder 22 through the temperature difference between the inside and outside and the vacuum degree, the temperature control accuracy is avoided due to the temperature difference between the inside temperature of the vacuum drying barrel 2 and the temperature generated by the annular heating outer cylinder 22 under vacuum conditions.
[0032] It should be noted that the internal temperature sensor 200 is directly inserted into the clearance groove 210 on the drying plate 21, so that the internal temperature sensor 200 can be close to the material and measure the temperature of the bottom of the material placed on the drying plate 21, so that the measured data is closer to the temperature of the material, thereby further reducing the temperature measurement error. Through the cooperation of the internal temperature sensor 200 and the external temperature sensor 201, the temperature control accuracy inside the vacuum drying barrel 2 in the vacuum environment is accurate to ±0.5℃.
[0033] Example 2 aims to address the problem of low timeliness and significant pressure fluctuations inside a vacuum chamber when manually adjusting the vacuum level. This example is an improvement upon Example 1. For details, please refer to [link to example]. Figure 1 , Figure 3 and Figure 4 One end of the vacuum pumping line 31 is connected to the vacuum drying chamber 2, and the other end of the vacuum pumping line 31 is connected to the vacuum pump 310. The solenoid valve 30 controls the closed state of the vacuum pumping line 31 to maintain the internal pressure of the vacuum drying chamber 2. The pressure measuring line 32 is connected to a pressure sensor 320 for detecting the internal pressure of the vacuum drying chamber 2. The closed state between the pressure sensor 320 in the solenoid valve 30 and the inside of the vacuum drying chamber 2 is normally open.
[0034] The housing 1 is also equipped with an operation panel 10 for receiving and processing data from the internal temperature sensor 200, the external temperature sensor 201 and the air pressure sensor 320, as well as an integrated control panel 10 for the annular heating outer cylinder 22 and the solenoid main valve 30.
[0035] In this embodiment: the pressure sensor 320 is a high-precision pressure sensor with a detection range of ±100 kPaS. The vacuum pump is a vacuum pump with an ultimate vacuum degree of ≤100 Pa. The vacuum pump 310 is connected to the vacuum pumping pipeline 31 through a pipeline, so that it can perform vacuuming operation on the inside of the vacuum drying barrel 2. Moreover, since the pressure sensor 320 is connected to the inside of the vacuum drying barrel 2 through the pressure measuring pipeline 32, and the pressure measuring pipeline 32 in the solenoid main valve 30 is in a normally open state, the pressure sensor 320 can monitor the internal pressure of the vacuum drying barrel 2 in real time.
[0036] Subsequently, the operation panel 10 displays and organizes the air pressure signal collected by the air pressure sensor 320, and controls the solenoid main valve 30 to switch the closed state of the vacuum pipeline 31, so as to automatically and stably maintain the internal air pressure of the vacuum drying barrel 2.
[0037] Finally, this type of intelligent temperature-controlled vacuum drying oven with manual pressure relief function uses the electromagnetic main valve 30 to control the closure of the vacuum pipeline 31. Compared with manual intervention, it has the advantages of rapid adjustment and fast response, thereby avoiding excessive fluctuations in the air pressure inside the vacuum drying barrel 2, so as to achieve automatic self-maintenance of the vacuum degree of the vacuum drying barrel 2.
[0038] It should be noted that the vacuum pump 310 is an externally mounted separate unit from the chamber 1, which simplifies the internal structure of this intelligent temperature-controlled vacuum drying oven with manual pressure relief function, reduces maintenance and repair costs, and also reduces its size, making it suitable for home and laboratory environments.
[0039] Example 3 aims to address the issue that strictly following operating procedures is necessary when depressurizing and opening the chamber lid of a vacuum dryer to avoid safety hazards. Existing depressurization procedures are cumbersome, and in some steps, the chamber lid is unlocked while the high-temperature, high-pressure gas inside the vacuum dryer has not been fully released. This example is an improvement upon Example 1. For details, please refer to [link / reference]. Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5The end of the pressure relief pipeline 33 is connected to a mechanical pressure relief valve 330. Inside the solenoid main valve 30, the closed state between the pressure relief pipeline 33 and the vacuum drying barrel 2 is normally open. The opening and closing of the pressure relief pipeline 33 is controlled by the closed state of the mechanical pressure relief valve 330. The mechanical pressure relief valve 330 is equipped with a knob 331 for adjusting its closed state. The knob 331 is located on the outside of the chamber 1. The chamber 1 is equipped with a scale mark for distinguishing the rotation state of the knob 331. The opening and closing of the chamber cover 4 is mechanically interlocked with the closed state of the mechanical pressure relief valve 330.
[0040] In this embodiment: First, an integrated HEPA filter can be installed in the pressure relief pipeline 33 so that the airflow flowing out through the mechanical pressure relief valve 330 is directly filtered and discharged. The closed state between the pressure relief pipeline 33 and the vacuum drying barrel 2 is normally open, and the opening and closing of the pressure relief pipeline 33 is controlled by the closed state of the mechanical pressure relief valve 330.
[0041] Subsequently, the closed state of the mechanical pressure relief valve 330 can be adjusted by rotating the knob 331. When the mechanical pressure relief valve 330 is in the open state, the high temperature and high pressure gas in the vacuum drying barrel 2 passes through the pressure relief pipe 33, the integrated HEPA filter, and the mechanical pressure relief valve 330 in sequence to be discharged to the outside.
[0042] Then, the mechanical pressure relief valve 330 can be calibrated according to the scale on the housing 1 and the knob 331 to adjust the opening and closing size of the mechanical pressure relief valve 330, thereby balancing the pressure relief rate of the mechanical pressure relief valve 330 with the filtration efficiency of the integrated HEPA filter.
[0043] Finally, the opening and closing of the cavity cover 4 is mechanically interlocked with the closed state of the pressure relief pipeline 33, thereby improving safety and clarifying usage specifications.
[0044] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.
[0045] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.
Claims
1. A self-maintaining intelligent temperature-controlled vacuum drying oven, comprising a chamber body (1), wherein a vacuum drying barrel (2) is disposed inside the chamber body (1), a cavity cover (4) for closing the vacuum drying barrel (2) is provided on the chamber body (1), a sealing ring for sealing the vacuum drying barrel (2) is provided on the cavity cover (4), and a control device (3) for maintaining the vacuum state inside the vacuum drying barrel (2) is provided on the chamber body (1), wherein the control device (3) comprises a solenoid main valve (30), and the solenoid main valve (30) is connected to a vacuum pumping pipeline (31), a pressure measuring pipeline (32), and a pressure relief pipeline (33) respectively via pipes, characterized in that: One end of the vacuum line (31) is connected to the vacuum drying barrel (2), and the other end of the vacuum line (31) is connected to a vacuum pump (310). The electromagnetic master valve (30) controls the closed state of the vacuum line (31) to maintain the vacuum level inside the vacuum drying barrel (2). The end of the pressure relief pipeline (33) is connected to a mechanical pressure relief valve (330). In the electromagnetic main valve (30), the pressure relief pipeline (33) and the vacuum drying barrel (2) are normally open. The opening and closing of the pressure relief pipeline (33) is controlled by the closing state of the mechanical pressure relief valve (330).
2. The intelligent temperature-controlled vacuum drying oven with self-maintaining vacuum degree according to claim 1, characterized in that: The vacuum drying barrel (2) includes a double-layer inner barrel (20) with a heat-conducting medium filling the interlayer. A drying plate (21) is provided inside the double-layer inner barrel (20). The outer wall of the drying plate is in contact with the inner wall of the double-layer inner barrel (20). An annular heating outer cylinder (22) is provided on the double-layer inner barrel (20). The annular heating outer cylinder (22) is fitted onto the outer wall of the double-layer inner barrel (20). The annular heating outer cylinder (22) transfers heat to the drying plate (21) through the wall of the double-layer inner barrel (20).
3. The intelligent temperature-controlled vacuum drying oven with self-maintaining vacuum degree according to claim 2, characterized in that: The double-layer inner barrel (20) is provided with an internal temperature sensor (200) inserted inside it, and the double-layer inner barrel (20) is also provided with an external temperature sensor (201) placed on its wall.
4. The intelligent temperature-controlled vacuum drying oven with self-maintaining vacuum degree according to claim 3, characterized in that: The drying plate (21) is provided with a clearance groove (210) for avoiding the internal temperature sensor (200), and the top horizontal plane of the drying plate (21) is higher than the top horizontal plane of the internal temperature sensor (200).
5. The intelligent temperature-controlled vacuum drying oven with self-maintaining vacuum degree according to claim 3, characterized in that: The pressure measuring pipeline (32) is connected to a pressure sensor (320) for detecting the pressure inside the vacuum drying barrel (2). The pressure sensor (320) in the electromagnetic main valve (30) is normally open when it is closed to the inside of the vacuum drying barrel (2).
6. The intelligent temperature-controlled vacuum drying oven with self-maintaining vacuum degree according to claim 5, characterized in that: The housing (1) is also provided with an operation panel (10) for receiving and processing data from the internal temperature sensor (200), the external temperature sensor (201) and the air pressure sensor (320), as well as for integrating control of the annular heating outer cylinder (22) and the solenoid main valve (30).
7. The intelligent temperature-controlled vacuum drying oven with self-maintaining vacuum degree according to claim 1, characterized in that: The mechanical pressure relief valve (330) is provided with a knob (331) for adjusting its closed state. The knob (331) is located outside the housing (1). The housing (1) is provided with scale markings for distinguishing the rotation state of the knob (331).
8. The intelligent temperature-controlled vacuum drying oven with self-maintaining vacuum degree according to claim 7, characterized in that: The opening and closing of the cavity cover (4) is mechanically interlocked with the closed state of the mechanical pressure relief valve (330).