Vacuum filtration blowback device and vacuum dryer

Abstract

The utility model discloses a vacuum filtration blowback device and a vacuum dryer, which belong to the technical field of chemical equipment and comprise a gas pipeline module and a filtration module, the gas pipeline module comprises a main gas pipeline and two auxiliary gas pipelines; the bottom of the gas main pipeline is inserted into the filtering module; one ends of the two auxiliary gas pipelines are communicated with the main gas pipeline, and the other ends are respectively communicated with the vacuum pump and the gas source; and a valve is arranged at the other end of each gas auxiliary pipeline. According to the utility model, the valve is arranged on the vacuumizing pipe, so that the pressure drop loss is reduced, the back flushing effect is improved, the gas pipeline module and the filtering module of the vacuum filtering and back flushing device are convenient to disassemble and assemble through the modular design, and the cleaning difficulty of the filtering module and the operation difficulty in the equipment maintenance process are reduced.

Description

Technical Field

[0001] This utility model belongs to the field of chemical equipment technology, specifically relating to a vacuum filter backflushing device and a vacuum dryer, which is mainly used in vacuum dryers. Background Technology

[0002] The single-cone vacuum dryer is a multi-functional device integrating mixing, drying, and distillation. Compared with a double-cone rotary vacuum dryer of the same specifications, the single-cone vacuum dryer has a drying efficiency of 2 to 3 times that of the double-cone rotary vacuum dryer, a loading capacity of 2 times, and a relative efficiency improvement of 4 to 6 times. It is particularly suitable for process treatment in closed and controlled environments, such as in the pharmaceutical and chemical industries.

[0003] A single-cone vacuum dryer typically consists of a stainless steel vertical container, a mixing and pulverizing device, a discharge device, a control device, and a vacuum filtration and backflushing device. Heat energy (such as hot water, low-pressure steam, or heat transfer oil) is introduced into the sealed jacket of the vertical container. Heat is transferred to the material being dried through the inner shell of the container. The main shaft and screw conveyor are heated with hot water or a heat source with a temperature not exceeding 100°C, further improving drying efficiency. Driven by a power source, the material inside the container is continuously mixed, thereby enhancing the drying process. Under vacuum, the vapor pressure decreases, causing the moisture (solvent) on the material surface to reach saturation and evaporate, which is then promptly discharged and recovered by the vacuum pump. The moisture (solvent) inside the material continuously undergoes three processes: permeation to the surface, evaporation, and discharge, achieving the desired dryness in a very short time.

[0004] In a single-cone vacuum dryer, a vacuum filter backflushing device is connected to a vacuum pump to create a vacuum inside the cone. The device includes a filter module and a backflushing module; the filter module prevents powdered materials from being carried into the vacuum pump, thus achieving material drying; the backflushing module backflushes the filter module, solving the problems of frequent filter clogging and low drying efficiency. The structural design of the vacuum filter backflushing device significantly impacts the equipment's drying efficiency, the frequency of filter module cleaning, and the complexity and labor intensity of equipment maintenance.

[0005] Patent 201010553676.5 discloses a single-cone dryer with a progressive stirrer, whose rod trap includes a vacuum tube, a gas backflush tube, and a filter cover; the vacuum tube and the gas backflush tube are respectively set at both ends of the filter cover, and the filter cover is wrapped with filter media. Although this design improves the filtration efficiency to a certain extent, it also has some problems: (1) Since the vacuum tube is directly connected to the vacuum pump, when the gas backflush tube performs backflush, the backflush gas is easy to leak through the vacuum tube, resulting in pressure drop loss and affecting the backflush effect; (2) Since the vacuum tube and the gas backflush tube are respectively set at both ends of the filter cover, and the filter cover is wrapped with filter media, the filter media in the rod trap is not easy to disassemble and replace, which increases the difficulty of cleaning the filter part (such as the filter cover) and the operation of equipment maintenance. Utility Model Content

[0006] In view of this, the present invention provides a vacuum filter backflushing device and a vacuum dryer. By setting a valve on the vacuum tube, the pressure drop loss is reduced and the backflushing effect is improved. The modular design makes it easy to disassemble and assemble the gas pipeline module and the filter module of the vacuum filter backflushing device, reducing the cleaning difficulty of the filter module and the operational difficulty of the equipment maintenance process.

[0007] This utility model is achieved through the following technical solution:

[0008] A vacuum filter backflushing device includes: a gas pipeline module and a filter module;

[0009] The gas pipeline module includes: a main gas pipeline and two auxiliary gas pipelines;

[0010] The bottom of the main gas pipeline is inserted into the filter module;

[0011] One end of each of the two gas auxiliary pipes is connected to the main gas pipe, and the other end is connected to the vacuum pump and the gas source, respectively; a valve is provided at the other end of each gas auxiliary pipe.

[0012] Furthermore, several openings are evenly distributed on the lower part of the main gas pipeline wall;

[0013] At the bottom of the main gas pipeline, a fixed flange A is coaxially fitted above the opening; the main gas pipeline is fixedly connected to the filter module through the fixed flange A.

[0014] Furthermore, the two gas auxiliary pipes are a vacuum pipe and a gas backflush pipe, respectively;

[0015] One end of the vacuuming pipe is connected to the main gas pipeline, and the other end is connected to the vacuum pump;

[0016] One end of the gas backflush pipe is connected to the main gas pipe, and the other end is connected to the gas source.

[0017] Furthermore, the gas backflush pipe is located between the vacuum pipe and the filter module.

[0018] Furthermore, the filtration module includes: a fixed flange B and a filter element;

[0019] The filter element has a blind hole in the center for insertion into the main gas pipeline, and several openings are evenly distributed on the filter element.

[0020] The fixed flange B has a through hole at its center, which is coaxially fixed to the opening end of the blind hole of the filter element through an annular connection structure; the filter module is fixed to the vacuum dryer through the fixed flange B.

[0021] Furthermore, the filter element has a cylindrical structure.

[0022] Furthermore, the valve is a solenoid valve.

[0023] A vacuum dryer includes the aforementioned vacuum filter backflushing device, wherein the filter module in the vacuum filter backflushing device is disposed on the upper cover of the vacuum dryer for filtering gases entering and exiting the interior of the vacuum dryer.

[0024] Beneficial effects:

[0025] (1) The present invention provides a vacuum filter backflushing device, which is divided into a gas pipeline module and a filter module. Two gas auxiliary pipelines are simultaneously fixed to the gas main pipeline (i.e., they are not designed separately). By simplifying the redundant design through modularization and first principles, the device structure is simple, easy to process and manufacture, and easy to disassemble and adapt. At the same time, the filter module is easy to clean and maintain, making the equipment maintenance simple and easy to operate, and reducing the labor intensity of personnel. The other end of the two gas auxiliary pipelines is connected to the vacuum pump and the gas source respectively, and the other end of each gas auxiliary pipeline is equipped with a valve. When backflushing, the gas inside the gas pipeline module can be prevented from leaking outward, thereby causing pressure drop loss. When vacuuming, the gas outside the gas pipeline module can be prevented from flowing inward, thereby reducing the vacuuming effect and affecting the drying effect. The vacuum filter backflushing device can achieve a good backflushing effect, improve the drying efficiency of the vacuum dryer, reduce drying energy consumption, and reduce the frequency of filter module cleaning, effectively reducing the cross-contamination between materials and the environment.

[0026] (2) In the vacuum filter backflushing device of this utility model, several openings are evenly distributed on the lower pipe wall of the main gas pipeline, so that the backflushing gas is more evenly distributed in or around the pipeline, reducing the backflushing dead angle and thus improving the backflushing effect; the main gas pipeline is fixedly connected to the filter module through the fixed flange A, making it convenient to disassemble and assemble the gas pipeline module and the filter module.

[0027] (3) In the vacuum filter backflush device of this utility model, the gas backflush pipe is located between the vacuum pipe and the filter module, so that the gas backflush pipe is close to the filter module, reducing pressure drop loss and reducing the amount of backflush gas used, thereby improving the backflush effect.

[0028] (4) In the present invention, a vacuum filter backflushing device is provided, wherein the filter module is fixedly connected to the vacuum dryer by the fixed flange B, which makes it convenient to disassemble and assemble the filter module and the vacuum dryer.

[0029] (5) The vacuum filter backflush device of this utility model has a cylindrical filter element with a large specific surface area, which is beneficial to improving the backflush efficiency.

[0030] (6) The vacuum filter backflushing device of this utility model has a solenoid valve for each valve. The start and stop of the two solenoid valves can be controlled by setting a control system, thereby controlling the automatic opening and closing of the vacuuming pipeline and the gas backflushing pipeline, thereby realizing the time separation of the two functions of vacuuming and gas backflushing, and further improving the drying efficiency.

[0031] (7) A vacuum dryer of the present invention includes the above-mentioned vacuum filter backflushing device, which can reduce pressure drop loss and improve drying efficiency. Attached Figure Description

[0032] Figure 1 This is a schematic diagram showing the position of the vacuum filter backflushing device of this utility model on a single cone vacuum dryer;

[0033] Figure 2 This is a schematic cross-sectional view of the vacuum filter backflushing device of this utility model.

[0034] Figure 3 This is a schematic diagram of the gas pipeline module structure of the vacuum filtration backflushing device of this utility model;

[0035] Figure 4 This is a schematic diagram of the filter module structure of the vacuum filter backflushing device of this utility model;

[0036] Among them, 1-vacuum filter backflush device, 2-gas pipeline, 21-vacuum pumping pipeline, 22-gas backflush pipeline, 23-gas main pipeline, 24-fixed flange A, 3-valve A, 4-valve B, 5-filter module, 51-fixed flange B, 52-filter element. Detailed Implementation

[0037] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0038] Example 1:

[0039] This embodiment provides a vacuum filter backflushing device, which is installed on the upper cover of a vacuum dryer.

[0040] As an example, such as Figure 1 As shown, the vacuum dryer is a single-cone vacuum dryer, and the vacuum filter device 1 is installed on the upper cover of the single-cone vacuum dryer.

[0041] like Figure 2 As shown, the vacuum filter backflushing device 1 includes: a gas pipeline module 2, a filter module 5, and two valves (let the two valves be valve A3 and valve B4 respectively).

[0042] The vacuum dryer is connected to the vacuum pump and gas source (for providing backflushing gas) via gas pipeline module 2. For example... Figure 3 As shown, the gas pipeline module 2 includes: a fixed flange A24, a main gas pipeline 23, and two auxiliary gas pipelines.

[0043] The bottom of the main gas pipe 23 is sealed; several openings are evenly distributed on the lower part of the main gas pipe 23. The evenly distributed openings allow the backflushing gas to be more evenly distributed inside or around the pipe, reducing backflushing dead angles and thus improving the backflushing effect.

[0044] One end of each of the two auxiliary gas pipes is connected to the main gas pipe 23, and the other end is connected to the vacuum pump and the gas source, respectively. Let the two auxiliary gas pipes be the vacuum pumping pipe 21 and the gas backflushing pipe 22.

[0045] The vacuum pumping pipe 21 connects the vacuum pump and the main gas pipe 23. A valve A3 is installed at the end of the vacuum pumping pipe 21 that is connected to the vacuum pump. Valve A3 is used to seal the opening of the vacuum pumping pipe 21 to prevent gas inside the gas pipe module 2 from leaking out through the vacuum pumping pipe 21 during backflushing, thus preventing pressure drop loss. In this embodiment, the vacuum pumping pipe 21 is connected to the main gas pipe 23 by welding.

[0046] The gas backflush pipe 22 connects the gas source and the main gas pipe 23. A valve B4 is installed at the end of the gas backflush pipe 22 connected to the gas source. Valve B4 is used to close the gas backflush pipe 22 to prevent gas outside the gas pipe module 2 from flowing in through the gas backflush pipe 22 during vacuuming, thereby reducing the vacuuming effect and affecting the drying effect. In this embodiment, the gas backflush pipe 22 is connected to the main gas pipe 23 by welding.

[0047] As an example, the gas backflush pipe 22 is located between the vacuum pipe 21 and the filter module 5, so that the gas backflush pipe 22 is close to the filter module 5, reducing pressure drop loss and reducing the amount of backflush gas used, thereby improving the backflush effect.

[0048] The fixed flange A24 is coaxially mounted above the bottom opening of the main gas pipeline 21, and is used to connect the main gas pipeline 23 and the filter module 5. The fixed flange A24 is fixed to the main gas pipeline 21 by welding.

[0049] like Figure 4 As shown, the filter module 5 includes: a fixed flange B51 and a filter element 52.

[0050] The filter element 52 has a blind hole at its center, which is used to insert into the main gas pipe 23. The diameter of the blind hole is larger than the outer diameter of the main gas pipe 23. The filter element 52 has several openings evenly distributed on it. In this embodiment, the filter element 52 is preferably a cylindrical structure, as the cylindrical structure has a large specific surface area, which is beneficial for improving backflushing efficiency. Simultaneously, the material of the filter element 52 is preferably a sintered stainless steel mesh or filter cloth, which is beneficial for improving the filtration performance and durability of the filter element 52.

[0051] The fixed flange B51 has a through hole at its center, which is coaxially fixed to the open end of the blind hole of the filter element 52 through an annular connecting structure. The fixed flange B51 and the fixed flange A24 are stacked on the upper end face of the filter module sleeve in sequence and fixed by screws to realize the connection between the gas pipeline module 2 and the filter module 5 in the vacuum filter backflushing device 1 and the upper cover of the single cone vacuum dryer.

[0052] Working principle:

[0053] When the single-cone vacuum dryer is working, water vapor or other solvents in the material to be dried are extracted along with air through the vacuum pipe 21 of the vacuum filter backflushing device 1, and the material mixed in with the water vapor or other solvents is intercepted by the filter element 52 of the filter module 5, thereby achieving the purpose of drying. The vacuum filter backflushing device 1 backflushes the filter module 5 with gas through the gas backflushing pipe 22 at regular intervals, thereby preventing clogging at the openings of the filter element 52 and ensuring backflushing efficiency.

[0054] Example 2:

[0055] Based on the above embodiment 1, this embodiment provides a vacuum filter backflushing device. In the vacuum filter backflushing device 1, valves A3 and B4 are preferably solenoid valves, and it also includes a control system.

[0056] The control system is used to control the start and stop of two solenoid valves (implemented by programming, the programming part is existing technology and is not included in the protection scope), thereby controlling the automatic opening and closing of the vacuuming pipe 21 and the gas backflushing pipe 23, and thus realizing the time separation of the two functions of vacuuming and gas backflushing, thereby further improving the drying efficiency.

[0057] In summary, the above are merely preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A vacuum filter backflushing device, characterized in that The utility model relates to a vacuum filter back flushing device, which comprises: a gas pipeline module (2) and a filter module (5); the gas pipeline module (2) comprises a gas main pipeline (23) and two gas auxiliary pipelines; the bottom of the gas main pipeline (23) is inserted into the filter module (5); one end of each of the two gas auxiliary pipelines is communicated with the gas main pipeline (23), and the other end is respectively communicated with a vacuum pump and a gas source; the other end of each gas auxiliary pipeline is provided with a valve.

2. The vacuum filtration backflush apparatus of claim 1, wherein, a plurality of openings are uniformly arranged on the lower pipe wall of the gas main pipeline (23); a fixed flange plate A (24) is coaxially sleeved above the opening at the bottom of the gas main pipeline (23); the gas main pipeline (23) is fixedly connected with the filter module (5) through the fixed flange plate A (24).

3. The vacuum filtration backflush apparatus of claim 1 or 2, wherein, the two gas auxiliary pipelines are respectively a vacuum pipeline (21) and a gas back flushing pipeline (22); one end of the vacuum pipeline (21) is communicated with the gas main pipeline (23), and the other end is communicated with the vacuum pump; one end of the gas back flushing pipeline (22) is communicated with the gas main pipeline (23), and the other end is communicated with the gas source.

4. The vacuum filtration backflush apparatus of claim 3, wherein, the gas back flushing pipeline (22) is located between the vacuum pipeline (21) and the filter module (5).

5. The vacuum filtration backflush apparatus of claim 1 or 2, wherein the filter module (5) comprises a fixed flange plate B (51) and a filter core (52); the filter core (52) has a blind hole in the center for inserting the gas main pipeline (23), and a plurality of openings are uniformly arranged on the filter core (52); the fixed flange plate B (51) is provided with a through hole in the center, which is coaxially fixedly connected with the opening end of the blind hole of the filter core (52) through an annular connecting structure; the filter module (5) is fixedly connected with a single-cone vacuum dryer through the fixed flange plate B (51).

6. The vacuum filtration backflush apparatus of claim 5, wherein, the filter core (52) has a cylindrical structure.

7. The vacuum filtration backflush apparatus of claim 1 or 2, wherein the valve is an electromagnetic valve.

8. A vacuum desiccator characterized by, the vacuum filter back flushing device comprises the filter module (5) of any one of the preceding claims, and the filter module (5) is arranged on the upper cover of the vacuum dryer and used for filtering the gas entering or leaving the inside of the vacuum dryer.

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