A flat plate pulse vacuum drying oven

Abstract

The present invention provides a flat plate pulse vacuum drying oven, including a drying oven body, a placement rack, and a first pulse mechanism; the placement rack is disposed inside the drying oven body, and the first pulse mechanism includes a first pulse tube and a direct injection assembly. The first direct pulse tube passes through the drying oven body, and multiple sets of direct injection assemblies are provided and connected to the first pulse tube. The direct injection assembly can directly spray onto the placement rack.

Description

Technical Field

[0001] This invention relates to the field of drying technology, specifically to a flat plate pulse vacuum drying oven. Background Technology

[0002] In pharmaceutical, bioengineering, and food processing fields, the drying of high-viscosity materials (such as traditional Chinese medicine extracts, high-protein slurries, and high-sugar pastes) is a critical production step. These materials are characterized by high viscosity, unique surface tension, and difficulty in removing moisture, placing stringent requirements on the temperature uniformity, vacuum stability, and defoaming capabilities of the drying equipment. The flat plate pulse vacuum drying oven, as a low-temperature drying device compliant with the new GMP standards, utilizes the core principles of flat plate heating and pulse vacuum to achieve rapid drying of materials by lowering the boiling point of water. It also boasts advantages such as low energy consumption and high product quality, and has been widely used in the drying of high-viscosity and heat-sensitive materials. It mainly consists of a chamber, drying racks, a flat plate heating system, a pulse vacuum system, a defoaming system, and a control system. Heat is transferred through flat plate heating, combined with a pulsed pressure reduction and increase process to extract solvents from the material, completing the drying process.

[0003] Currently, existing flat-plate pulse vacuum drying ovens have incorporated preliminary bubble-breaking structures to address the foaming problem of high-viscosity materials. These include methods such as using pulse solenoid valves to control airflow through jet pipes to break bubbles, or utilizing the latent heat of steam in explosive drying to assist in bubble breaking. However, significant technical shortcomings remain in practical applications. The core issue is that high-viscosity materials easily form stubborn localized blind spots when foaming, leading to poor drying results and unstable product quality. During vacuum drying, high-viscosity materials, due to their high viscosity and poor flowability, rapidly evaporate internal moisture upon heating, forming bubbles. These bubbles, constrained by the material's viscosity, are difficult to break on their own and tend to adhere to the flat plate surface, corners of the drying racks, and areas where materials accumulate, creating sealed localized bubble blind spots. Existing bubble-breaking structures are insufficient to effectively cover and eliminate these blind spots. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention proposes a flat plate pulse vacuum drying oven to solve the technical problem mentioned in the background art of local blind spots that are difficult to remove when high-viscosity materials foam.

[0005] To solve this technical problem, the technical solution adopted by the present invention is as follows: A flat plate pulse vacuum drying oven includes: a drying oven body, a placement rack, and a first pulse mechanism; The placement rack is installed inside the drying chamber. The first pulse mechanism includes a first pulse tube and a direct injection assembly. The first direct pulse tube passes through the drying chamber body. The direct injection assembly is provided in multiple sets and is connected to the first pulse tube. The direct injection assembly can directly spray onto the placement rack.

[0006] Furthermore, the direct injection assembly includes an adapter box and direct injection pipes; multiple direct injection pipes are provided and pass through the placement rack, and are connected to the first pulse pipe through the adapter box. The adapter box is fixed to the placement rack or the first pulse pipe, and the direct injection pipe is provided with a plurality of air jets, the air jets facing the placement tray.

[0007] Furthermore, a first rotating mechanism is provided, which can drive the direct injection pipe to rotate back and forth.

[0008] Furthermore, the direct injection pipe is rotatably mounted on the placement frame, and a first toothed ring is coaxially fixed on the direct injection pipe; the first rotation mechanism includes a first rack, a first connecting plate, and a first telescopic rod; the first telescopic rod is connected to the first rack through the first connecting plate, and the first rack and the first toothed ring mesh.

[0009] Furthermore, a tangential flow equalization mechanism is provided, which is installed on the drying chamber body and located on the side of the first pulse mechanism. The tangential flow equalization mechanism can blow air into the placement rack from the side of the placement rack.

[0010] Furthermore, the tangential flow equalization mechanism includes a second pulse tube and a tangential tube; the second pulse tube is inserted through the drying chamber body, and multiple tangential tubes are provided. One end of the tangential tube is connected to the second pulse tube, and the other end is inserted through the placement rack. The tangential tube can blow air from the side inside the placement rack.

[0011] Furthermore, the tangential tube is rotatably mounted on the placement frame, and a second rotating mechanism is provided, which can drive the tangential tube to reciprocate.

[0012] Furthermore, a second toothed ring is coaxially fixed on the tangential tube. The second rotating mechanism includes a second telescopic rod, a second connecting plate, and a second rack. The second telescopic rod is located inside the drying chamber and is connected to the second rack through the second connecting plate. The second rack can simultaneously mesh with the second toothed ring.

[0013] The advancements of this application compared to existing technologies are as follows: Traditional single-spray nozzles are usually located on the side of the placement rack, making it difficult to eliminate local blind spots when materials foam. In this application, the tray is directly sprayed through the first pulse mechanism. Compared with the traditional method, it can spray more directly into the local blind spots when high-viscosity materials foam, reducing the blind spots when foaming and resulting in better drying effect. Attached Figure Description

[0014] To more clearly illustrate the specific embodiments of the present invention, the accompanying drawings used in the specific embodiments will be briefly described below. In all the drawings, the elements or parts are not necessarily drawn to scale.

[0015] Figure 1 A schematic diagram of a flat plate pulse vacuum drying oven provided in an embodiment of the present invention; Figure 2 for Figure 1 The diagram shows the internal structure of a flat plate pulse vacuum drying oven. Figure 3 This is a schematic diagram of the first pulse mechanism and the first rotation mechanism in this invention; Figure 4 for Figure 3 A schematic diagram of the first pulse mechanism and the first rotation mechanism from another angle; Figure 5 This is a schematic diagram of the tangential flow equalization mechanism and the second rotation mechanism in this invention.

[0016] Figure label: Drying oven body 1, placement rack 2, first pulse mechanism 3, first pulse tube 31, direct injection assembly 32, adapter box 321, direct injection pipe 322, first gear ring 323, first rotation mechanism 4, first rack 41, first connecting plate 42, first telescopic rod 43, tangential flow equalization mechanism 5, second pulse tube 51, tangential tube 52, second gear ring 53, second rotation mechanism 6, second telescopic rod 61, second connecting plate 62, second rack 63. Detailed Implementation

[0017] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solution of the present invention and are therefore intended to limit the scope of protection of the present invention.

[0018] Please refer to the following: Figures 1-5 The present invention provides a flat plate pulse vacuum drying oven, comprising: a drying oven body 1, a placement rack 2 and a first pulse mechanism 3; The placement rack 2 is located inside the drying chamber body 1. The first pulse mechanism 3 includes a first pulse tube 31 and a direct injection assembly 32. The first pulse tube passes through the drying chamber body 1. Multiple sets of direct injection assemblies 32 are provided and connected to the first pulse tube 31. The direct injection assembly 32 can directly spray onto the placement rack 2. Specifically, the direct injection assembly 32 directly sprays onto the trays on the placement rack 2, and the number of direct injection assemblies 32 corresponds to the number of trays that can be placed in the placement rack 2. That is, the number of direct injection assemblies 32 corresponds to the number of layers where trays can be placed. It should also be understood that, in addition to the above structure, this device also has other common components that are required in a flat plate pulse vacuum drying chamber to ensure the normal operation of this device. The specific parts and structures are clearly described in the prior art, so they will not be repeated here.

[0019] Traditional single-spray nozzles are usually located on the side of the placement rack 2, which makes it difficult to eliminate local blind spots when materials foam. In this application, the tray is directly sprayed through the first pulse mechanism 3. Compared with the traditional method, it can spray more directly on the local blind spots when high-viscosity materials foam, reducing the blind spots when foaming and resulting in better drying effect.

[0020] In other embodiments, the direct injection assembly 32 includes an adapter box 321 and direct injection pipes 322. Multiple direct injection pipes 322 are provided and pass through the placement rack 2, communicating with the first pulse pipe 31 via the adapter box 321. The adapter box 321 is fixed to the placement rack 2 or the first pulse pipe 31. Several air nozzles are provided on the direct injection pipes 322, facing the placement tray. Specifically, the direct injection pipes 322 are vertically arranged, and several direct injection pipes 322 are provided on each layer of the placement rack 2. Preferably, nozzles are provided on the air nozzles.

[0021] In other designs, a first rotating mechanism 4 is also provided, which drives the direct injection pipe 322 to rotate reciprocally. By rotating the direct injection pipe 322 through the first rotating mechanism 4, the air jet from the direct injection pipe 322 can cover a wider area. Specifically, the first rotating mechanism 4 is activated in conjunction with the operation of the first pulse pipe 31 during the drying process, thereby causing the air jet nozzle to face different angles during drying.

[0022] In other embodiments, the direct injection pipe 322 is rotatably mounted on the mounting frame 2, and a first toothed ring 323 is coaxially fixed on the direct injection pipe 322. The first rotating mechanism 4 includes a first rack 41, a first connecting plate 42, and a first telescopic rod 43. The first telescopic rod 43 is connected to the first rack 41 through the first connecting plate 42, and the first rack 41 meshes with the first toothed ring 323. Specifically, the first telescopic rod 43 is preferably an electrically operated telescopic rod, which can control the movement of the first rack 41 through a control circuit, thereby changing the angle of each direct injection pipe 322. The first rack 41 can simultaneously mesh with the first toothed ring 323 at the same horizontal position.

[0023] In other designs, a tangential flow equalization mechanism 5 is also provided. This mechanism is mounted on the drying chamber body 1 and located on the side of the first pulse mechanism 3. The tangential flow equalization mechanism 5 can blow air into the placement rack 2 from the side. Specifically, the air outlet direction of the tangential flow equalization mechanism 5 is tangential to the inner wall of the cavity, forming a full-area annular swirling flow after air intake. Uneven airflow distribution within the placement rack 2 cavity results in a large difference in drying rate between the material center and edge, leading to uneven moisture content and poor quality in the finished product. This structure achieves matrix-style full-coverage air jetting through the tangential flow equalization mechanism 5 and the first pulse mechanism 3. By coordinating the tangential air outlet with the first pulse mechanism 3 to change the flow direction, full-area airflow equalization is achieved, resulting in better drying.

[0024] In other embodiments, the tangential flow equalization mechanism 5 includes a second pulse tube 51 and tangential tubes 52. The second pulse tube 51 is installed on the drying chamber body 1, and multiple tangential tubes 52 are provided. One end of each tangential tube 52 is connected to the second pulse tube 51, and the other end is installed on the placement rack 2. The tangential tubes 52 can blow air from the side inside the placement rack 2. Specifically, the tangential tubes 52 are L-shaped tubes, and each tangential tube 52 has a jet nozzle at its end. The number of tangential tubes 52 corresponds to the number of direct injection components 32.

[0025] In other designs, the tangential pipe 52 is rotatably mounted on the mounting frame 2, and a second rotating mechanism 6 is provided, which drives the tangential pipe 52 to rotate reciprocally. Since the deflector is an L-shaped pipe, the tangential jet direction changes when the L-shaped pipe rotates. By driving the tangential pipe 52 to rotate reciprocally, the direction of the airflow ejected from the tangential pipe 52 can be changed in accordance with the change of the direct jet pipe 322, thereby avoiding turbulence in the airflow within the cavity caused by the change of the direct jet direction, and ensuring that the airflow remains uniform.

[0026] In other embodiments, a second toothed ring 53 is coaxially fixed on the tangential pipe 52. The second rotating mechanism 6 includes a second telescopic rod 61, a second connecting plate 62, and a second rack 63. The second telescopic rod 61 is located inside the drying chamber body 1 and is connected to the second rack 63 via the second connecting plate 62. The second rack 63 can simultaneously mesh with the second toothed ring 53. Preferably, the second telescopic rod 61 is an electrically operated telescopic rod. Preferably, both the first telescopic rod 43 and the second telescopic rod 61 are controlled by a control circuit, so that the second telescopic rod 61 can be activated when the first telescopic rod 43 is activated, thereby achieving accurate control of the airflow direction.

[0027] The aforementioned flat plate pulse vacuum drying oven can cover a wider area and reduce bubbling caused by dead corners.

[0028] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. A flat plate pulse vacuum drying oven, characterized in that, Includes the drying oven body, the placement rack, and the first pulse mechanism; The placement rack is installed inside the drying chamber. The first pulse mechanism includes a first pulse tube and a direct injection assembly. The first direct pulse tube passes through the drying chamber body. The direct injection assembly is provided in multiple sets and is connected to the first pulse tube. The direct injection assembly can directly spray onto the placement rack.

2. The flat plate pulse vacuum drying oven according to claim 1, characterized in that, The direct injection assembly includes an adapter box and direct injection pipes; multiple direct injection pipes are provided and pass through the placement rack, and are connected to the first pulse pipe through the adapter box. The adapter box is fixed on the placement rack or the first pulse pipe. The direct injection pipe is provided with a number of air jets, and the air jets face the placement tray.

3. A flat plate pulse vacuum drying oven according to claim 2, characterized in that, It is also provided with a first rotating mechanism, which can drive the direct injection pipe to rotate back and forth.

4. A flat plate pulse vacuum drying oven according to claim 3, characterized in that, The direct injection pipe is rotatably mounted on the placement frame, and a first toothed ring is coaxially fixed on the direct injection pipe; the first rotating mechanism includes a first rack, a first connecting plate and a first telescopic rod; the first telescopic rod is connected to the first rack through the first connecting plate, and the first rack and the first toothed ring mesh.

5. A flat plate pulse vacuum drying oven according to claim 1, characterized in that, A tangential flow equalization mechanism is also provided, which is installed on the body of the drying chamber and located on the side of the first pulse mechanism. The tangential flow equalization mechanism can blow air into the placement rack from the side of the placement rack.

6. A flat plate pulse vacuum drying oven according to claim 5, characterized in that, The tangential flow equalization mechanism includes a second pulse tube and a tangential tube; the second pulse tube is installed on the drying chamber body, and multiple tangential tubes are provided. One end of the tangential tube is connected to the second pulse tube, and the other end is installed on the placement rack. The tangential tube can blow air from the side inside the placement rack.

7. A flat plate pulse vacuum drying oven according to claim 6, characterized in that, The tangential tube is rotatably mounted on the placement frame and is also provided with a second rotating mechanism that can drive the tangential tube to rotate back and forth.

8. A flat plate pulse vacuum drying oven according to claim 7, characterized in that, A second toothed ring is coaxially fixed on the tangential tube. The second rotating mechanism includes a second telescopic rod, a second connecting plate, and a second rack. The second telescopic rod is located inside the drying chamber and is connected to the second rack through the second connecting plate. The second rack can simultaneously mesh with the second toothed ring.

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