Vacuum drying equipment and heating system thereof

Abstract

The utility model provides a heating system of vacuum drying equipment. The heating system comprises a side wall heating unit arranged on the side wall of a drying cavity of the vacuum drying equipment and a bottom heating unit arranged at the bottom of the drying cavity. The side wall heating unit comprises a plurality of side wall heating assemblies, and the side wall heating assemblies are evenly distributed in the linear direction, perpendicular to the bottom of the drying cavity, of the side wall of the drying cavity. The bottom heating unit comprises a bottom heating subunit arranged in the length direction of the drying cavity and an auxiliary heating subunit used for assisting the bottom heating subunit. According to the heating system of the vacuum drying equipment, through combined work of the side wall heating assembly and the bottom heating unit, it is ensured that materials in the drying cavity are evenly heated in all directions, the problems of heat accumulation and non-uniformity are solved, and therefore the drying efficiency is improved, and heat losses are reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of vacuum drying equipment, and more specifically relates to vacuum drying equipment and a heating system thereof. Background Art

[0002] Vacuum drying equipment is a key equipment in many industrial fields, such as pharmaceutical, food, chemical, ceramic, metal processing and electronic industries. Its working principle mainly relies on the vacuum pump to extract the air in the drying chamber, reduce the pressure, thereby reducing the boiling point of water, so that the material can be quickly dehumidified at low temperature.

[0003] In the operation of vacuum drying equipment, heating is one of the important links. By heating, the temperature of the material can be increased, the movement speed of water molecules can be accelerated, and the evaporation of water molecules from the surface of the material can be promoted. Common heating methods include direct heating and indirect heating. Direct heating refers to placing the heating element directly in the material and transferring heat to the material by heat conduction. The advantage of this method is rapid heat transfer and good drying effect. Indirect heating refers to transferring heat to the material through a heating medium such as hot air, hot water or hot oil. The advantage of this method is less thermal damage to the material, but the disadvantage is that the heat transfer speed is slow and the drying effect is relatively poor. At present, vacuum drying equipment prefers to use direct heating. In the design of vacuum drying equipment in the field of photovoltaic semiconductors, six flower baskets are usually set in the drying chamber of the vacuum drying equipment for placing materials (the materials can at least include silicon wafers). However, the drying effect of the two middle flower baskets is often not ideal, because in a vacuum environment, energy transfer mainly relies on radiation heat conduction, and this transfer efficiency is inversely proportional to the square of the distance, resulting in a slower drying speed of the material in the middle.

[0004] Therefore, it is necessary to propose a new solution for the heating structure of the vacuum drying equipment. Summary of the invention

[0005] The utility model aims to overcome the problems of low heat transfer efficiency and high heat loss in existing vacuum drying equipment and its heating structure. The utility model proposes a vacuum drying equipment and its heating system to improve drying efficiency and reduce heat loss.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] In a first aspect, the utility model provides a heating system for vacuum drying equipment, comprising a side wall heating unit arranged on the side wall of a drying chamber of the vacuum drying equipment and a bottom heating unit arranged at the bottom of the drying chamber; the side wall heating unit comprises a plurality of groups of side wall heating components, and each group of the side wall heating components is evenly distributed along the height direction of the drying chamber; the bottom heating unit comprises a bottom heating sub-unit arranged along the length direction of the drying chamber, and an auxiliary heating sub-unit for assisting the bottom heating sub-unit.

[0008] As a preferred embodiment, the side wall heating assembly includes at least two side wall heating elements arranged in sequence along the length direction of the drying chamber, and a connecting section is formed between two adjacent side wall heating elements; there is an angle between two adjacent connecting sections along the height direction of the drying chamber.

[0009] As a preferred solution, the bottom heating subunit comprises a first bottom heating element and a second bottom heating element, and the first bottom heating element and the second bottom heating element form an overlapping area.

[0010] As a preferred solution, the overlapping area and its corresponding first bottom heating element and second bottom heating element form a bottom heating assembly; the bottom heating subunit includes multiple groups of the bottom heating assemblies, and each group of the bottom heating assemblies is evenly distributed along the width direction of the drying chamber.

[0011] As a preferred embodiment, the auxiliary heating subunit includes a first auxiliary heating element arranged at an end of the first bottom heating element away from the second bottom heating element, and a second auxiliary heating element arranged at an end of the second bottom heating element away from the first bottom heating element; the first auxiliary heating element is arranged along the width direction of the drying chamber; the second auxiliary heating element is arranged along the width direction of the drying chamber.

[0012] In a second aspect, the utility model provides a vacuum drying device, comprising a drying chamber, a vacuum system and a heating system as described in the first aspect; further comprising a loading system for loading materials to be vacuum dried and a fixing system for fixing the loading system.

[0013] As a preferred embodiment, the vacuum system includes an exhaust duct arranged on the side wall of the drying chamber, and an air intake duct arranged at the bottom of the drying chamber; it also includes a filter element for filtering the gas entering the air intake duct; the air intake duct is provided with multiple air intake holes along the length direction of the drying chamber.

[0014] As a preferred solution, the fixing system includes a avoidance unit for protecting the side wall heating unit and the vacuum system and a supporting unit for supporting the loading system.

[0015] As a preferred solution, the avoidance unit includes at least two avoidance members; the avoidance member includes a connecting portion for connecting to the drying chamber and a protecting portion for protecting the vacuum system; an avoidance section is provided between the connecting portion and the protecting portion.

[0016] As a preferred solution, the support unit includes a support plate and a mounting plate for mounting the support plate; the number and position of the support plates correspond to the avoidance member.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] The heating system of the vacuum drying equipment ensures all-round and uniform heating of the material in the drying chamber through the joint operation of the side wall heating assembly and the bottom heating unit, avoiding the problems of heat accumulation and unevenness, thereby improving drying efficiency and reducing heat loss.

[0019] The vacuum drying equipment, by integrating the drying chamber, the vacuum system, the heating system, the driving system, the loading system and the fixing system, forms a vacuum drying equipment with a complete structure and clear functions. Through the coordinated work of various systems, the drying efficiency is improved and the material quality is maintained. The equipment has high technical practicality and market application prospects.

[0020] Further or more detailed beneficial effects will be described in detail in conjunction with specific examples in the specific implementation manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a structural schematic diagram of a vacuum drying device and a heating system thereof described in the utility model.

[0023] Figure 2 It is a partial structural schematic diagram of a vacuum drying device and a heating system thereof described in the utility model.

[0024] Figure 3 It is a partial structural schematic diagram of a vacuum drying device and a heating system thereof described in the utility model.

[0025] Figure 4 It is a partial structural schematic diagram of a vacuum drying device and a heating system thereof described in the utility model.

[0026] Figure 5 It is a side view of a vacuum drying device and a heating system thereof described in the utility model.

[0027] Figure Number:

[0028] 01. Heating system;

[0029] 100. Side wall heating unit;

[0030] 110. Side wall heating assembly; 111. Side wall heating element; 112. Connection section;

[0031] 200, bottom heating unit;

[0032] 210, bottom heating subunit; 211, bottom heating assembly; 2111, first bottom heating element; 2112, second bottom heating element; 2113, overlapping area;

[0033] 220, auxiliary heating subunit; 221, first auxiliary heating element; 222, second auxiliary heating element;

[0034] 02. Drying chamber;

[0035] 03. Vacuum system;

[0036] 310, exhaust pipe; 320, air intake pipe; 321, air intake hole; 330, filter element;

[0037] 04. Loading system;

[0038] 05.Fixed system;

[0039] 410, avoidance unit; 411, avoidance member; 4111, connecting portion; 4112, protection portion; 4113, avoidance section;

[0040] 420, support unit; 421, support plate; 422, mounting plate. DETAILED DESCRIPTION

[0041] The utility model is further described below in conjunction with the drawings and specific embodiments of the specification. A person of ordinary skill in the art will be able to implement the utility model based on these descriptions. In addition, the embodiments of the utility model involved in the following description are usually only embodiments of a part of the utility model, rather than all embodiments. Therefore, based on the embodiments in the utility model, all other embodiments obtained by a person of ordinary skill in the art without making creative work should belong to the scope of protection of the utility model. In addition, the terms "vertical", "horizontal", "front", "rear", etc. mentioned in the embodiments of the utility model indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the product is usually placed when used, which is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. It should be further explained that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like in the description should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, an indirect connection through an intermediate medium, or the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0042] Embodiment 1:

[0043] like Figure 1-5 As shown, this embodiment provides a heating system 01 of a vacuum drying device, comprising a side wall heating unit 100 arranged on the side wall of a drying chamber 02 of the vacuum drying device and a bottom heating unit 200 arranged at the bottom of the drying chamber 02. The combined operation of the side wall heating assembly 110 and the bottom heating unit 200 ensures all-round and uniform heating of the material in the drying chamber 02, avoiding the problems of heat accumulation and unevenness.

[0044] The side wall heating unit 100 includes multiple groups of side wall heating components 110, and each group of the side wall heating components 110 is evenly distributed along the height direction of the drying chamber 02. The side wall heating components 110 include at least two side wall heating elements 111 arranged in sequence along the length direction of the drying chamber 02, and a connecting section 112 is formed between two adjacent side wall heating elements 111. There is an angle between two adjacent connecting sections 112 along the height direction of the drying chamber 02, so that heat can be more evenly transferred to every corner of the drying chamber 02, ensuring that the heat is stably generated at every place on the side wall.

[0045] The bottom heating unit 200 includes a bottom heating subunit 210 arranged along the length direction of the drying chamber 02, and the bottom heating subunit 210 includes a first bottom heating element 2111 and a second bottom heating element 2112, and the first bottom heating element 2111 and the second bottom heating element 2112 form an overlapping section 2113. The overlapping section 2113 and its corresponding first bottom heating element 2111 and second bottom heating element 2112 form a bottom heating assembly 211. It can be understood that in the same bottom heating assembly 211, the first bottom heating element 2111 and the second bottom heating element 2112 are arranged alternately and have the overlapping section 2113, so that there is no heating blind area between the first bottom heating element 2111 and the second bottom heating element 2112, which can ensure that the heat of each area in the drying chamber 02 is uniform and stable. The bottom heating subunit 210 includes multiple groups of bottom heating assemblies 211, and each group of bottom heating assemblies 211 is evenly distributed along the width direction of the drying chamber 02.

[0046] The bottom heating unit 200 further includes an auxiliary heating subunit 220 for assisting the bottom heating subunit 210. It can be understood that the edge of the drying chamber 02 dissipates heat faster. In order to maintain the thermal stability of each area of ​​the drying chamber 02, the auxiliary heating subunit 220 can be arranged at the edge of the drying chamber 02. The auxiliary heating subunit 220 includes a first auxiliary heating element 221 arranged at an end of the first bottom heating element 2111 away from the second bottom heating element 2112, and a second auxiliary heating element 222 arranged at an end of the second bottom heating element 2112 away from the first bottom heating element 2111. The first auxiliary heating element 221 is arranged along the width direction of the drying chamber 02, and the second auxiliary heating element 222 is arranged along the width direction of the drying chamber 02.

[0047] Furthermore, this embodiment provides a preferred mode of the side wall heating assembly 110 and the bottom heating unit 200. The side wall heating assembly 110 and the bottom heating unit 200 can both adopt infrared heating tubes. The working principle of infrared heating tubes is based on the radiation characteristics of infrared rays. When current passes through the infrared emitting element, the element will heat up and emit infrared rays. These infrared rays have different wavelengths, and a part of them is reflected back to the emitting element by the reflective element, thereby enhancing the heating effect. The main advantages of infrared heating tubes are high thermal efficiency, fast heating speed, and no open flames, so they are very useful in some specific applications.

[0048] Embodiment 2:

[0049] like Figure 1-5As shown, this embodiment provides a vacuum drying device, including a drying chamber 02, a vacuum system 03 and a heating system 01 as described in the first embodiment, and also includes a loading system 04 for loading materials to be vacuum dried and a fixing system 05 for fixing the loading system 04.

[0050] It can be understood that the drying chamber 02 provides a place for vacuum drying and establishes basic conditions for vacuum drying of materials. The vacuum system 03 is responsible for extracting air in the drying chamber 02 to reduce pressure, thereby reducing the boiling point of the material and accelerating the drying process. The heating system 01 is used to provide the heat required for drying. The function of the fixing system 05 is to ensure the stability of the loading system 04 and prevent the material from moving or tilting during the drying process.

[0051] The vacuum system 03 includes an exhaust pipe 310 disposed on the side wall of the drying chamber 02 and an intake pipe 320 disposed at the bottom of the drying chamber 02 . The intake pipe 320 is provided with a plurality of intake holes 321 along the length direction of the drying chamber 02 .

[0052] Compared with the upper suction and lower discharge method in the prior art, this embodiment achieves technical effects such as improved drying efficiency, uniform drying, reduced energy consumption, improved equipment stability, and improved operating environment through the upper discharge and lower suction gas flow method. Specifically, the upper discharge and lower suction gas flow method can make the material dehydrate faster during the drying process. When air is extracted, moisture and other volatile substances will be discharged along with the air, thereby accelerating the drying process.

[0053] The vacuum system 03 also includes a filter 330 for filtering the gas entering the air inlet pipe 320. It can be understood that when the heating system 01 is working, the drying chamber 02 is in a high temperature environment. Filling the drying chamber 02 with filtered gas can generate heat convection, and accelerating the gas flow in the drying chamber 02 can ensure the drying efficiency of every corner of the drying chamber 02. This embodiment combines heat radiation, heat convection and conduction to achieve the best drying effect. In addition, this structural setting has low requirements for the gas introduced. Air can be used without the need to use nitrogen, which effectively reduces costs.

[0054] The fixing system 05 includes a avoidance unit 410 for protecting the side wall heating unit 100 and the vacuum system 03 and a support unit 420 for supporting the loading system 04. The avoidance unit 410 includes at least two avoidance members 411, and the avoidance member 411 includes a connecting portion 4111 for connecting to the drying chamber 02 and a protecting portion 4112 for protecting the vacuum system 03, and an avoidance section 4113 is provided between the connecting portion 4111 and the protecting portion 4112. Furthermore, the protecting portion 4112 is provided with heat dissipation holes to facilitate easier penetration of heat radiation, reduce the impact on the heat released by the side wall heating assembly 110, and ensure drying efficiency. The support unit 420 includes a support plate 421 and a mounting plate 422 for mounting the support plate 421, and the number and position of the support plate 421 correspond to the avoidance member 411.

[0055] This embodiment integrates the drying chamber 02, the vacuum system 03, the heating system 01, the driving system, the loading system 04 and the fixing system 05 to form a vacuum drying device with a complete structure and clear functions. Specifically, when vacuum drying the material, firstly, the heating system 01 transfers heat through thermal radiation, which can directly heat the surface of the material to increase the temperature of the material, thereby accelerating the migration of moisture from the inside of the material to the surface. Secondly, the exhaust pipe 310 provides a low-pressure, fast and efficient drying environment for material drying, which is particularly suitable for materials that are easily deteriorated or damaged at high temperatures. The highly filtered gas is discharged through the air intake pipe 320, which can accelerate the gas flow in the drying chamber 02. Thermal convection is generated under the thermal radiation of the heating system 01, so that all parts of the drying chamber 02 can be fully dried. It can be seen that this embodiment improves the drying efficiency and maintains the quality of the material through the coordinated work of various systems, and has high technical practicality and market application prospects.

[0056] It should be noted that, for the aforementioned method embodiments, for the sake of simplicity, they are all expressed as a series of action combinations, but those skilled in the art should be aware that the present application is not limited by the described order of actions, because according to the present application, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present application.

[0057] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0058] The above is only an exemplary embodiment of the present disclosure, and the scope of the present disclosure cannot be limited thereto. That is, any equivalent changes and modifications made according to the teachings of the present disclosure are still within the scope of the present disclosure. After considering the specification and practicing the disclosure here, those skilled in the art will easily think of the implementation scheme of the present disclosure. This application is intended to cover any modification, use or adaptation of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary technical means in the technical field not recorded in the present disclosure. The description and examples are regarded as exemplary only, and the scope and spirit of the present disclosure are defined by the claims.

Claims

1. A heating system for a vacuum drying device, characterized in that: It comprises a side wall heating unit (100) arranged on the side wall of a drying chamber (02) of a vacuum drying device, and a bottom heating unit (200) arranged on the bottom of the drying chamber (02); The side wall heating unit (100) comprises a plurality of groups of side wall heating components (110), and each group of the side wall heating components (110) is evenly distributed along the height direction of the drying chamber (02); The bottom heating unit (200) comprises a bottom heating subunit (210) arranged along the length direction of the drying chamber (02), and an auxiliary heating subunit (220) used to assist the bottom heating subunit (210).

2. The heating system of a vacuum drying equipment according to claim 1, characterized in that: The side wall heating assembly (110) comprises at least two side wall heating elements (111) arranged in sequence along the length direction of the drying chamber (02), and a connecting section (112) is formed between two adjacent side wall heating elements (111); There is an angle between two adjacent connecting sections (112) along the height direction of the drying chamber (02).

3. The heating system of a vacuum drying equipment according to claim 1, characterized in that: The bottom heating subunit (210) comprises a first bottom heating element (2111) and a second bottom heating element (2112), wherein the first bottom heating element (2111) and the second bottom heating element (2112) form an overlapping section (2113).

4. The heating system of a vacuum drying equipment according to claim 3, characterized in that: The overlapping section (2113) and its corresponding first bottom heating element (2111) and second bottom heating element (2112) form a bottom heating assembly (211); The bottom heating subunit (210) comprises a plurality of groups of bottom heating components (211), and each group of bottom heating components (211) is evenly distributed along the bottom width direction of the drying chamber (02).

5. The heating system of a vacuum drying equipment according to claim 3, characterized in that: The auxiliary heating subunit (220) comprises a first auxiliary heating element (221) arranged at an end of the first bottom heating element (2111) away from the second bottom heating element (2112), and a second auxiliary heating element (222) arranged at an end of the second bottom heating element (2112) away from the first bottom heating element (2111); The first auxiliary heating element (221) is arranged along the width direction of the bottom of the drying chamber (02); The second auxiliary heating element (222) is arranged along the width direction of the bottom of the drying chamber (02).

6. A vacuum drying device, characterized in that: It comprises a drying chamber (02), a vacuum system (03) and a heating system (01) according to any one of claims 1 to 5; It also includes a loading system (04) for loading materials to be vacuum dried and a fixing system (05) for fixing the loading system (04).

7. A vacuum drying device according to claim 6, characterized in that: The vacuum system (03) comprises an exhaust duct (310) arranged on a side wall of the drying chamber (02), and an air intake duct (320) arranged at the bottom of the drying chamber (02); Also included is a filter element (330) for filtering gas entering the air intake pipe (320); The air inlet duct (320) is provided with a plurality of air inlet holes (321) along the length direction of the drying chamber (02).

8. A vacuum drying device according to claim 6 or 7, characterized in that: The fixing system (05) comprises an avoidance unit (410) for protecting the side wall heating unit (100) and the vacuum system (03), and a supporting unit (420) for supporting the loading system (04).

9. A vacuum drying device according to claim 8, characterized in that: The avoidance unit (410) comprises at least two avoidance members (411); The avoidance member (411) comprises a connection portion (4111) for connecting to the drying chamber (02) and a protection portion (4112) for protecting the vacuum system (03); An avoidance section (4113) is provided between the connecting portion (4111) and the protecting portion (4112).

10. A vacuum drying device according to claim 9, characterized in that: The support unit (420) comprises a support plate (421) and a mounting plate (422) for mounting the support plate (421); The number and position of the support plates (421) correspond to the avoidance members (411).

Images