Vacuum drying device

Abstract

The utility model discloses a vacuum drying device which comprises a vacuum box, a main pipeline, a plurality of auxiliary pipelines and a vacuum generating device. The interior of the vacuum box is hollow and forms a vacuum chamber; the main pipeline is communicated with the middle part of the vacuum chamber; each auxiliary pipeline communicates with the edge position of the vacuum chamber, and the connecting positions of the multiple auxiliary pipelines and the vacuum chamber are evenly distributed relative to the middle of the vacuum chamber; the vacuum generating device is connected with the main pipeline and / or the auxiliary pipeline so that the main pipeline and / or the auxiliary pipeline can vacuumize the vacuum cavity. The vacuum generating device is used for improving the uniformity of the vacuumizing effect of the vacuum generating device on the interior of the vacuum cavity, and then the drying uniformity of the vacuum drying device is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of drying devices, in particular to a vacuum drying device. Background Art

[0002] Vacuum drying is an existing drying method, which places the product to be dried in a sealed vacuum chamber, and gradually reduces the pressure in the vacuum chamber by using a vacuum pumping device, so that the product to be dried gradually enters a saturated or supersaturated state, and the solvent in the product to be dried evaporates and is extracted by the vacuum pumping device, thereby achieving drying of the product to be dried.

[0003] Existing vacuum drying devices usually use a main pipe to connect the vacuum pumping device and the vacuum chamber, so that the vacuum pumping device can evacuate the vacuum chamber through the main pipe, and the gas extraction position in the vacuum chamber is the connection position between the main pipe and the vacuum chamber. Among them, the main pipe is generally connected to the middle of the vacuum chamber to improve the uniformity of the air pressure in the vacuum chamber. However, during the vacuum pumping process, the part located at the edge of the vacuum chamber is far away from the main pipe, resulting in a slow gas extraction speed at the edge of the vacuum chamber, which in turn affects the uniformity of the air pressure in the vacuum chamber and affects the uniformity of drying of the product to be dried. Utility Model Content

[0004] The utility model aims to provide a vacuum drying device, which is used to improve the uniformity of the vacuuming effect of a vacuum generating device on a vacuum chamber, thereby improving the uniformity of the vacuum drying device during drying.

[0005] The purpose of the utility model is achieved by the following technical solutions:

[0006] A vacuum drying device, comprising:

[0007] A vacuum box, which is hollow inside and forms a vacuum chamber;

[0008] A main pipeline is connected with the middle part of the vacuum chamber;

[0009] A plurality of auxiliary pipelines, each of the auxiliary pipelines is communicated with an edge position of the vacuum chamber, and connection positions of the plurality of auxiliary pipelines and the vacuum chamber are evenly distributed relative to a middle portion of the vacuum chamber;

[0010] A vacuum generating device is connected to the main pipeline and / or the auxiliary pipeline, so that the main pipeline and / or the auxiliary pipeline can evacuate the vacuum chamber.

[0011] Preferably, the connection positions of the plurality of auxiliary pipelines and the vacuum chamber are distributed in a circular array around the middle of the vacuum chamber;

[0012] Alternatively, an even number of the auxiliary pipelines are provided, and the even number of the auxiliary pipelines are symmetrically distributed relative to the middle of the vacuum chamber.

[0013] Preferably, a plurality of vacuum generating devices are provided, and each of the vacuum generating devices is respectively connected to the main pipeline and / or the auxiliary pipeline.

[0014] Preferably, it also includes a connecting pipeline, which includes a first pipeline and a second pipeline that are interconnected, the first pipeline is connected to the main pipeline and the plurality of auxiliary pipelines, and the second pipeline is connected to the vacuum generating device.

[0015] Preferably, the flow path lengths of the gas in the vacuum chamber flowing from each auxiliary pipeline to the vacuum generating device are the same.

[0016] Preferably, the first pipeline includes a connecting portion and a plurality of branch portions, the connecting portion is located in the middle of the first pipeline, and the connecting portion is connected to the main pipeline and the second pipeline; each of the branch portions is connected to a part of the auxiliary pipelines, and at least one of the branch portions is provided with a control valve, and the control valve is used to control the on and off of the corresponding branch portion.

[0017] Preferably, the connecting portion is provided with a vacuum gauge, and the vacuum gauge is used to detect the vacuum degree in the connecting portion;

[0018] And / or, the connecting portion is provided with a pressure display element, and the pressure display element is used to display the pressure in the connecting portion.

[0019] Preferably, an extending direction of the second pipeline, an extending direction of the main pipeline, and an extending direction of the first pipeline are perpendicular to each other.

[0020] Preferably, at least a part of the auxiliary pipelines are connected to control valves, and the control valves are used to control the opening and closing of the corresponding auxiliary pipelines.

[0021] Preferably, a plurality of flow velocity detection components are housed in the vacuum chamber, and each of the flow velocity detection components is arranged corresponding to one of the auxiliary pipelines, so that the flow velocity detection component can detect the flow velocity at the corresponding auxiliary pipeline.

[0022] Compared with the prior art, the beneficial effects of the present invention include at least:

[0023] By evacuating the vacuum chamber through multiple auxiliary pipelines located at the edge of the vacuum chamber and the main pipeline located in the middle of the vacuum chamber, the speed at which the gas is extracted at the edge and the middle of the vacuum chamber can be more uniform, thereby improving the uniformity of the vacuum degree at various locations in the vacuum chamber and improving the uniformity of vacuum drying of the product to be dried. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of a vacuum drying device according to an embodiment of the utility model;

[0025] Figure 2 It is a partial structural schematic diagram of the vacuum drying device of an embodiment of the utility model.

[0026] In the figure: 1, vacuum box; 2, main pipeline; 3, auxiliary pipeline; 31, control valve; 4, vacuum generating device; 5, connecting pipeline; 51, first pipeline; 511, branch part; 512, connecting part; 52, second pipeline; 53, vacuum gauge; 54, pressure display. DETAILED DESCRIPTION

[0027] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided to make the present invention more comprehensive and complete and to fully convey the concepts of example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their repeated description will be omitted.

[0028] The words expressing positions and directions described in the present utility model are all explained by taking the drawings as examples, but they can be changed as needed, and all the changes are included in the protection scope of the present utility model.

[0029] like Figure 1 and Figure 2 As shown, the utility model provides a vacuum drying device, including a vacuum box 1, a main pipeline 2, an auxiliary pipeline 3 and a vacuum generating device 4, and may also include a connecting pipeline 5.

[0030] The vacuum box 1 is vacuumed inside and forms a vacuum chamber. The vacuum chamber can be used to accommodate the product to be dried. Specifically, the vacuum box 1 can be provided with an opening and closing door. When the opening and closing door is opened, the vacuum chamber is connected to the outside world, and the product to be dried can be placed in the vacuum chamber. Thereafter, the opening and closing door can be closed, and the vacuum chamber forms a closed chamber. Among them, the vacuum chamber accommodates a substrate and a perovskite liquid film coated on the substrate, and the perovskite liquid film serves as the product to be dried. In addition, the vacuum chamber can also be used to accommodate components such as laminar plates or uniform plates, and the laminar plates and pressure equalizing plates are arranged between the product to be dried and the main line 2. The laminar flow plate and the pressure equalizing plate are provided with a plurality of evenly distributed guide channels, the guide channels including a plurality of branch flow paths extending above the product to be dried and a converging flow path connected with the plurality of branch flow paths and used for converging the gases in the plurality of branch flow paths, the converging flow path can be connected with the main line 2 or the auxiliary line 3, and air is exhausted from a plurality of positions on the product to be dried through the plurality of branch flow paths of the plurality of guide channels and converged through the converging flow path before flowing to the main line 2 or the auxiliary line 3, so that the exhaust speed and air pressure at each position on the product to be dried are relatively uniform, thereby improving the uniformity of drying the product to be dried.

[0031] The main line 2 can be arranged above the vacuum box 1, and one end of the main line 2 is connected to the vacuum chamber in the vacuum box 1, and the other end can be directly or indirectly connected to the vacuum generating device 4, so that the gas in the vacuum chamber can flow out of the vacuum box 1 through the main line 2 under the action of the vacuum generating device 4 to evacuate the vacuum chamber, thereby achieving the evacuation of the vacuum chamber. The main line 2 is specifically connected to the middle of the vacuum chamber. For example, the vacuum chamber is a rectangular chamber, and the main line 2 is connected to the middle of the virtual upper surface of the vacuum chamber. When the main line 2 is connected to the middle of the vacuum chamber, the axis of the main line 2 can be perpendicular to the virtual upper surface of the vacuum chamber, and the axis of the main line 2 passes through the center point of the virtual upper surface of the vacuum chamber. The vacuum generating device 4 can be specifically a vacuum pump.

[0032] There are multiple auxiliary pipelines 3, and one end of each auxiliary pipeline 3 is connected to the vacuum chamber in the vacuum box 1, and the other end can be directly or indirectly connected to the vacuum generating device 4, so that the gas in the vacuum chamber can flow out of the vacuum box 1 through the corresponding auxiliary pipeline 3 under the action of vacuuming of the vacuum generating device 4. Among them, the inner diameter of the auxiliary pipeline 3 can be smaller than the inner diameter of the main pipeline 2, and the auxiliary pipeline 3 can be connected to the edge position of the vacuum chamber in the vacuum box 1. For example, the vacuum chamber is a rectangular chamber, and the auxiliary pipeline 3 is connected to the edge position of the virtual upper surface of the vacuum chamber. The edge position of the above-mentioned vacuum chamber can be the area excluding the middle position of the vacuum chamber. For example, when the vacuum chamber is a rectangular chamber, the virtual upper surface of the vacuum chamber has a virtual length and a virtual width, and the center position of the vacuum chamber can be a rectangular area with 1 / 2 virtual length and 1 / 2 virtual width, and the center point coincides with the center point of the virtual upper surface of the vacuum chamber; when the vacuum chamber is a circular chamber, the virtual upper surface of the vacuum chamber has a virtual radius, and the center position of the vacuum chamber can be a circular area with 1 / 2 virtual radius, and the center point coincides with the center point of the virtual upper surface of the vacuum chamber.

[0033] When it is necessary to vacuum dry the product to be dried in the vacuum box 1, the vacuum generating device 4 extracts the gas in the vacuum chamber of the vacuum box 1 through the main pipe 2. When the vacuum generating device 4 only evacuates gas through the main pipe 2, the gas at the edge of the vacuum chamber is extracted at a speed lower than that at the center of the vacuum chamber due to the large distance between the edge of the vacuum chamber and the main pipe 2. At this time, the vacuum generating device 4 can be used to evacuate the edge of the vacuum chamber through the auxiliary pipe 3 to increase the speed at which the gas at the edge of the vacuum chamber is extracted, so that when the vacuum chamber is evacuated, the gas at the edge and center of the vacuum chamber are extracted at the same or similar speeds, thereby improving the uniformity of the vacuum degree at various locations in the vacuum chamber and improving the uniformity of vacuum drying of the product to be dried.

[0034] In order to further improve the uniformity of the extraction speed of the gas at various locations in the vacuum chamber, the connection positions of the multiple auxiliary pipelines 3 and the vacuum chamber can be evenly distributed relative to the middle of the vacuum chamber. For example, the connection positions of the multiple auxiliary pipelines 3 and the vacuum chamber are distributed in a circular array around the middle of the vacuum chamber; or, the auxiliary pipelines 3 can be provided with an even number, and the even number of auxiliary pipelines 3 are symmetrically distributed relative to the middle of the vacuum chamber. Specifically, the auxiliary pipelines 3 can be provided with four, and the four auxiliary pipelines 3 are distributed in the four corners of a square.

[0035] One or more vacuum generating devices 4 may be provided. For example, when multiple vacuum generating devices 4 are provided, each vacuum generating device 4 may be selectively connected to the main pipeline 2 and / or at least one auxiliary pipeline 3, so that the vacuum generating device 4 can evacuate the vacuum chamber through the main pipeline 2 and / or the auxiliary pipeline 3 connected thereto. Alternatively, as a preferred embodiment, one vacuum generating device 4 is provided, and one vacuum generating device 4 is indirectly connected to the main pipeline 2 and multiple auxiliary pipelines 3 through the connecting pipeline 5.

[0036] Reference Figure 2 , the connecting pipeline 5 includes a first pipeline 51 and a second pipeline 52. One end of the second pipeline 52 is connected to the vacuum generating device 4, and the other end is communicated with the first pipeline 51. The first pipeline 51 is communicated with the main pipeline 2 and multiple auxiliary pipelines 3. Specifically, the first pipeline 51 includes a connecting portion 512 and multiple branch portions 511. The connecting portion 512 is located in the middle of the first pipeline 51, and the connecting portion 512 is used to communicate with the second pipeline 52 of the main pipeline 2. The branch portion 511 extends from the connecting portion 512 toward the corresponding auxiliary pipeline 3, so that the branch portion 511 can extend to the corresponding auxiliary pipeline 3 and be connected to the corresponding auxiliary pipeline 3. One or more branch portions 511 can be provided, and each branch portion 511 can be communicated with one or more auxiliary pipelines 3. In the present embodiment, two branch portions 511 are provided, and each branch portion 511 is communicated with two auxiliary pipelines 3.

[0037] When the vacuum box 1 is evacuated by the vacuum generating device 4, the gas in the vacuum chamber of the vacuum box 1 flows into the first pipeline 51 through the auxiliary pipeline 3 and the main pipeline 2, and then flows from the first pipeline 51 to the second pipeline 52 to be evacuated by the vacuum generating device 4. The extension direction of the second pipeline 52, the extension direction of the main pipeline 2, and the extension direction of the first pipeline 51 can be perpendicular to each other.

[0038] In order to ensure that each auxiliary pipeline 3 has the same extraction time and extraction speed when evacuating the vacuum box 1, the extension paths of the multiple auxiliary pipelines 3 have the same length, and the length of the flow path of the gas from the auxiliary pipeline 3 in the first pipeline 51 to the second pipeline 52 is the same, so that the flow path length of the gas in the vacuum chamber from each auxiliary pipeline 3 to the vacuum generating device 4 is the same, and then the multiple auxiliary pipelines 3 can simultaneously evacuate the vacuum box 1 under the action of the vacuum generating device 4 connected to the connecting pipeline 5, and the multiple auxiliary pipelines 3 have the same rate of evacuating the vacuum box 1.

[0039] When the vacuum box 1 is evacuated using the vacuum generating device 4, in order to facilitate the adjustment of the number of auxiliary pipelines 3 involved in the vacuuming, at least a part of the auxiliary pipelines 3 can be connected to the control valve 31, and the control valve 31 can control the on-off of the corresponding auxiliary pipeline 3. As a preferred embodiment, each auxiliary pipeline 3 is respectively connected to the control valve 31; and / or, at least one branch portion 511 is provided with a control valve 31, and the control valve 31 is used to control the on-off of the corresponding branch portion 511. As a preferred embodiment, each branch portion 511 is respectively provided with a control valve 31.

[0040] When each auxiliary pipeline 3 is respectively connected to a control valve 31, the unblocking and blocking of the corresponding auxiliary pipeline 3 can be controlled by controlling the opening and closing of the control valve 31 on the corresponding auxiliary pipeline 3. When the auxiliary pipeline 3 is unblocked, the auxiliary pipeline 3 can participate in the vacuum pumping operation of the vacuum box 1. When the auxiliary pipeline 3 is blocked, the auxiliary pipeline 3 does not participate in the vacuum pumping operation of the vacuum box 1.

[0041] When a control valve 31 is provided on each branch 511, the corresponding branch 511 can be controlled to be unblocked or blocked by controlling the opening and closing of the control valve 31 on the corresponding branch 511. When the branch 511 is unblocked, the auxiliary pipeline 3 connected to the branch 511 can participate in the vacuum pumping operation of the vacuum box 1. When the branch 511 is blocked, the auxiliary pipeline 3 connected to the branch 511 does not participate in the vacuum pumping operation of the vacuum box 1. The control valve 31 is a valve body that can control the opening and closing of the channel, such as a gate valve, a stop valve, a ball valve, and a butterfly valve; when the control valve 31 is opened, the corresponding auxiliary pipeline 3 or the branch 511 is unblocked, and when the control valve 31 is closed, the corresponding auxiliary pipeline 3 or the branch 511 is blocked.

[0042] In order to facilitate observation of the effect of vacuuming, the connection part 512 may be provided with a vacuum gauge 53, which can detect the vacuum degree in the connection part 512. And / or, the connection part 512 may be provided with a pressure display 54, which can be used to display the pressure of the connection part 512. The user can judge the effect of vacuuming according to the results detected and displayed by the vacuum gauge 53 and / or the pressure display 54. Among them, the pressure display 54 can be a pressure gauge.

[0043] As a preferred embodiment, a plurality of flow rate detection components can be housed in the vacuum chamber, and the flow rate detection components are used to detect the gas flow rate at the position where they are located. The flow rate detection components can be arranged corresponding to the auxiliary pipeline 3. For example, the number of flow rate detection components is the same as the number of auxiliary pipelines 3 and corresponds one to one. Among them, the flow rate detection component is arranged near the connection position between the corresponding auxiliary pipeline 3 and the vacuum chamber. By using the flow rate detection component for detection, it can be used to determine whether the corresponding auxiliary pipeline 3 is evacuating the vacuum chamber and the gas extraction speed when the corresponding auxiliary pipeline 3 is evacuating the vacuum chamber. The flow rate detection component can specifically be a flow meter.

[0044] Although the embodiments of the utility model have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the utility model. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the utility model without departing from the principles and purpose of the utility model. All of these changes should fall within the scope of protection of the claims of the utility model.

Claims

1. A vacuum drying device, characterized in that: include: A vacuum box, which is hollow inside and forms a vacuum chamber; A main pipeline is connected with the middle part of the vacuum chamber; A plurality of auxiliary pipelines, each of the auxiliary pipelines is communicated with an edge position of the vacuum chamber, and connection positions of the plurality of auxiliary pipelines and the vacuum chamber are evenly distributed relative to a middle portion of the vacuum chamber; A vacuum generating device is connected to the main pipeline and / or the auxiliary pipeline, so that the main pipeline and / or the auxiliary pipeline can evacuate the vacuum chamber.

2. The vacuum drying device according to claim 1, characterized in that: The connection positions of the plurality of auxiliary pipelines and the vacuum chamber are distributed in a circular array around the middle of the vacuum chamber; Alternatively, an even number of the auxiliary pipelines are provided, and the even number of the auxiliary pipelines are symmetrically distributed relative to the middle of the vacuum chamber.

3. The vacuum drying device according to claim 1, characterized in that: A plurality of vacuum generating devices are provided, and each of the vacuum generating devices is respectively connected to the main pipeline and / or the auxiliary pipeline.

4. The vacuum drying device according to claim 1, characterized in that: It also includes a connecting pipeline, which includes a first pipeline and a second pipeline that are interconnected, the first pipeline is connected to the main pipeline and the plurality of auxiliary pipelines, and the second pipeline is connected to the vacuum generating device.

5. The vacuum drying device according to claim 4, characterized in that: The flow path lengths of the gas in the vacuum chamber flowing from each auxiliary pipeline to the vacuum generating device are the same.

6. The vacuum drying device according to claim 4, characterized in that: The first pipeline includes a connecting portion and a plurality of branch portions, wherein the connecting portion is located in the middle of the first pipeline and is connected to the main pipeline and the second pipeline; each of the branch portions is connected to a portion of the auxiliary pipelines, and at least one of the branch portions is provided with a control valve, which is used to control the on and off of the corresponding branch portion.

7. The vacuum drying device according to claim 6, characterized in that: The connecting portion is provided with a vacuum gauge, and the vacuum gauge is used to detect the vacuum degree in the connecting portion; And / or, the connecting portion is provided with a pressure display element, and the pressure display element is used to display the pressure in the connecting portion.

8. The vacuum drying device according to claim 4, characterized in that: An extending direction of the second pipeline, an extending direction of the main pipeline, and an extending direction of the first pipeline are perpendicular to each other.

9. The vacuum drying device according to claim 1, characterized in that: At least a portion of the auxiliary pipelines are connected to control valves, and the control valves are used to control the opening and closing of the corresponding auxiliary pipelines.

10. The vacuum drying device according to claim 1, characterized in that: A plurality of flow velocity detection components are housed in the vacuum chamber, and each of the flow velocity detection components is arranged corresponding to one of the auxiliary pipelines, so that the flow velocity detection component can detect the flow velocity at the corresponding auxiliary pipeline.

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