Waste heat utilization energy-saving type vacuum drying oven

Abstract

The invention relates to the technical field of vacuum drying ovens, one embodiment of the invention provides a waste heat utilization energy-saving type vacuum drying oven which comprises heating components, a heat storage block, a reflection assembly, a heat storage mechanism and a ventilation air pipe, the multiple heating components are arranged at the bottom in a vacuum oven body, the multiple heating components are arranged around the heat storage mechanism, and the ventilation air pipe is arranged in the vacuum oven body. The heat storage mechanism comprises a plurality of heat storage blocks, the heat storage mechanism is used for storing part of heat generated by the heating components, the heat storage blocks can absorb the heat generated by the multiple heating components and meanwhile are used for preheating the interior of the vacuum box body, and the multiple reflection assemblies are fixedly connected into the vacuum box body; the reflection assembly is used for reflecting infrared rays generated by the heating component, the ventilation air pipe is fixedly connected to the side, away from the cabinet door, in the vacuum box body, and through the technical scheme, the technical problem that in the prior art, heat in the drying box is difficult to effectively utilize after drying, and waste is caused is solved.

Description

Technical Field

[0001] The embodiments of the present disclosure relate to the technical field of vacuum drying ovens, and in particular, to an energy-saving vacuum drying oven that utilizes waste heat. Background Art

[0002] Vacuum drying oven is a kind of equipment widely used in laboratories, scientific research, pharmaceuticals, food, chemicals and other fields. Vacuum drying oven can perform efficient drying in a low-temperature and low-oxygen environment. The principle of vacuum drying oven is to use a vacuum pump to extract part of the air in the vacuum drying box to maintain the required vacuum degree. At this time, the power consumption of the moisture in the sample to be dried is significantly reduced, and the liquid in the sample reaches the boiling point at a lower temperature, which accelerates the drying process and reduces the oxygen content in the box, preventing the oxidation and decomposition of the sample during the heating process.

[0003] Most existing vacuum drying ovens are equipped with a heating device. After a certain vacuum degree is maintained in the vacuum drying oven, the inside of the oven is heated to accelerate the evaporation of moisture in the sample. At the same time, the vacuum pump maintains suction in the oven and extracts the water vapor converted into water to the outside of the oven. The oven can then be opened to take out the sample. At this time, the oven still maintains a certain temperature, which is the residual temperature caused by the heating device heating the sample in the oven and the thin air in the oven. During the idle time between drying the next sample, the heat in the oven will be lost and wasted, and the heating time in the oven will be longer when drying the next sample. Summary of the Invention

[0004] To overcome the above-mentioned defects, the embodiments of the present disclosure provide a waste heat utilization energy-saving vacuum drying oven, which is used to solve the technical problem in the prior art that the heat in the drying oven after drying is difficult to be effectively utilized, resulting in waste.

[0005] According to one aspect, at least one embodiment of the present disclosure provides a waste heat utilization energy-saving vacuum drying oven, comprising a vacuum pump and a vacuum box body, wherein the vacuum box body is connected to the vacuum pump, and the vacuum pump is connected to the vacuum box body, and the opening position on the vacuum box body is rotatably provided with a cabinet door, and further comprising a heating component, a heat storage block, a reflection component, a heat storage mechanism and a ventilation duct, wherein a plurality of heating components are provided, and a plurality of the heating components are provided at the bottom of the vacuum box body, and a sample is provided above the heating component, and a plurality of the heating components are arranged in a surrounding manner, and a plurality of the heating components are arranged around the heat storage mechanism, and the heat storage mechanism includes a plurality of A heat storage block, multiple heat storage blocks are rotatably arranged under multiple samples, the heat storage mechanism is used to store part of the heat generated by the heating component, the heat storage block can absorb the heat generated by the multiple heating components, and is used to preheat the inside of the vacuum box, a plurality of reflective components are provided, and multiple reflective components are fixedly connected to the vacuum box, and the reflective components are used to reflect the infrared rays generated by the heating components. The ventilation duct is fixedly connected to the side of the vacuum box away from the cabinet door, and a plurality of fans are provided in the ventilation duct, and the fans are used to drive the gas in the vacuum box to flow.

[0006] The plurality of heating components are arranged at the center of the bottom of the vacuum box body, and a protective cover is fixedly connected to the bottom of the vacuum box body. The protective cover is arranged on the plurality of heating components, and an opening is provided on the side of the protective cover. A condensate tank is opened at the bottom of the vacuum box body, and the condensate tank is arranged around the protective cover.

[0007] The reflective assembly includes a reflective bracket and a reflective layer 1. The reflective bracket is fixedly connected to the corners of the vacuum box. The reflective layer 1 is fixedly connected to the reflective bracket on the side facing the inside of the vacuum box. The reflective layer 1 is arranged in an arc shape. A plurality of slots are arranged inside the vacuum box. A support plate is detachably connected to the slots. The sample is placed on the support plate. The support plate is arranged in a grid shape.

[0008] The heat storage mechanism also includes a support frame, a rotating rod, a reciprocating rotating device and a second reflecting layer. The support frame is fixedly connected to the bottom of the vacuum box, and multiple heat storage blocks are rotatably connected to the support frame. The rotating rod is fixedly connected to both ends of the heat storage block. Connecting rods are provided on both sides of the support frame, and the connecting rods are rotatably connected to multiple rotating rods. The reciprocating rotating device is provided at the bottom of the vacuum box, and the reciprocating rotating device is transmission-connected to the connecting rod. The reciprocating rotating device can drive multiple rotating rods to rotate simultaneously through the connecting rod. The second reflecting layer is fixedly provided on the side of multiple heat storage blocks away from the protective cover.

[0009] The heat storage block is arranged in a circular shape, and a plurality of heat exchange grooves are provided on the heat storage block. A heat insulation plate is fixedly connected to one side of the heat storage block, and the reciprocating rotating device drives the plurality of heat storage blocks to rotate. When the heat insulation plate approaches the protective cover, the heat storage block is located between the heat insulation plate and the reflective layer.

[0010] An air inlet is provided on the top of the ventilation duct, and an air outlet is provided on the bottom. A plurality of fans are fixedly installed in the ventilation duct between the air inlet and the air outlet. The air outlet is aligned with the opening on the side of the protective cover, and the air inlet opening is larger than the air outlet.

[0011] The support frame is provided with a groove, which is aligned with the gap between the heat storage blocks. The reciprocating rotating device drives the multiple heat storage blocks to rotate. When the heat insulation plate is away from the protective cover, the gas can flow between the heat exchange groove and the protective cover.

[0012] The beneficial effects of the embodiments of the present disclosure are: 1. In the present invention, by providing a reflective component, infrared rays and thermal radiation generated during heating that cannot heat the sample are refracted, thereby reducing wasted thermal radiation and achieving energy saving; 2. In the present invention, a heat storage block is provided to heat the sample by utilizing heat radiation that does not heat the sample. After drying, the heat storage block stores the heat and can be used to preheat the vacuum box. The wasted heat can then be stored and reused, achieving the purpose of heat recovery and energy saving. 3. In the present invention, by setting a reflective component, energy is saved by reducing the collection of heat emitted from other positions. By setting a heat storage mechanism, the wasted heat is utilized, and the heat is used to preheat the vacuum box, so as to achieve the purpose of waste heat utilization and energy saving. Compared with the heat recovery method in other vacuum dryers, the residual heat in the vacuum box is recovered into the heat exchange system to heat water or generate electricity. The repeated conversion and transmission of energy will lead to waste. At the same time, the vacuum drying box will not dry for a long time, and the heat conversion utilization rate is not high, and the practicality is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] To more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following briefly describes the drawings required for use in describing the embodiments of the present disclosure. Obviously, the drawings described below are merely some exemplary embodiments of the present disclosure. Those skilled in the art can, without inventive effort, derive other drawings based on the content of the exemplary embodiments of the present disclosure and these drawings.

[0014] Figure 1It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a structural schematic diagram of another perspective of the present invention as a whole; Figure 3 Schematic diagram of the internal cross-sectional structure of the vacuum box in the present invention; Figure 4 Schematic diagram of the internal cross-sectional structure of the protective cover and the ventilation duct in the present invention; Figure 5 This is a schematic diagram of the internal cross-sectional structure of the protective cover and the ventilation duct in the present invention from another perspective; Figure 6 It is a schematic diagram of the partial internal cross-sectional structure of the vacuum box and the reciprocating rotary device in the present invention; Figure 7 Schematic diagram of the structure of the heat storage mechanism in the present invention; Figure 8 It is a schematic diagram of the internal cross-sectional structure of the cooperation between the heat storage block and the reflective layer in the present invention.

[0015] In the figure: 1. Vacuum pump; 2. Vacuum box; 3. Cabinet door; 4. Heating component; 5. Heat storage block; 6. Ventilation duct; 7. Fan; 8. Protective cover; 9. Reflection bracket; 10. Reflection layer 1; 11. Slot; 12. Support plate; 13. Support frame; 14. Rotating rod; 15. Connecting rod; 16. Reciprocating rotating device; 17. Reflection layer 2; 18. Heat exchange tank; 19. Insulation board; 20. Air inlet; 21. Air outlet; 22. Condensate tank; 23. Reflection layer 3. DETAILED DESCRIPTION

[0016] The present disclosure will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present disclosure, rather than to limit the present disclosure.

[0017] To simplify the drawings, only the parts relevant to the disclosure are schematically shown in each figure; they do not represent the actual structure of the product. Furthermore, to simplify the drawings and facilitate understanding, in some figures, only one of the components with the same structure or function is schematically shown or labeled. In this document, "one" not only means "only one" but also "more than one," and "several" includes "two" and "more than two."

[0018] It should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this disclosure based on the specific circumstances.

[0019] In the present disclosure, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0020] In the description of this embodiment, the terms "up", "down", "left", "right", etc., and the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present disclosure.

[0021] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0022] like Figures 1 to 8As shown, it shows a waste heat utilization energy-saving vacuum drying oven in one embodiment of the present disclosure, including a vacuum pump 1 and a vacuum box body 2, the vacuum box body 2 is connected to the vacuum pump 1, the vacuum pump 1 is connected to the vacuum box body 2, the opening position of the vacuum box body 2 is rotatably provided with a cabinet door 3, and also includes a heating component 4, a heat storage block 5, a reflection component, a heat storage mechanism and a ventilation duct 6, a plurality of heating components 4 are provided, a plurality of heating components 4 are arranged at the bottom of the vacuum box body 2, a sample is provided above the heating component 4, a plurality of heating components 4 are arranged in a surrounding manner, a plurality of heating components 4 are arranged around the heat storage mechanism, the heat storage mechanism includes a plurality of heat storage blocks 5, a plurality of heat storage blocks 5 are rotatably arranged under a plurality of samples, the heat storage mechanism is used to store part of the heat generated by the heating component 4, the heat storage block 5 can absorb the heat generated by the plurality of heating components 4, and is used to preheat the inside of the vacuum box body 2, a plurality of reflection components are provided, and a plurality of The ventilator 6 is fixedly connected to the vacuum box 2, and the reflecting component is used to reflect the infrared rays generated by the heating component 4. The ventilation duct 6 is fixedly connected to the side of the vacuum box 2 away from the cabinet door 3. A plurality of fans 7 are provided in the ventilation duct 6, and the fans 7 are used to drive the gas in the vacuum box 2 to flow. In this application, a heat storage block 5 is set between the heating components 4, and the vacuum box 2 is heated and heated by the heating components 4 at the same time. The heat storage block 5 uses the heat in the space where no sample is set in the vacuum box 2 to heat up, and no heat is lost. When the next sample is dried, the gas in the vacuum box 2 can be preheated by driving the air flow around the heat storage block 5 to reduce the energy consumption of the heating component 4. At the same time, the heat radiation and infrared rays emitted when the heating component 4 is heated are transmitted toward the sample in the center of the heating box through the reflecting component, so that as much heat as possible is transferred to the sample to save energy.

[0023] like Figures 1 to 5 As shown, multiple heating components 4 are arranged in the center of the bottom of the vacuum box 2, and a protective cover 8 is fixedly connected to the bottom of the vacuum box 2. The protective cover 8 is covered on the multiple heating components 4, and an opening is provided on the side of the protective cover 8. A condensate tank 22 is provided at the bottom of the vacuum box 2, and the condensate tank 22 is arranged around the protective cover 8. The protective cover 8 can prevent the liquid in the sample from evaporating into the vacuum box 2 and condensing and falling on the heating components 4 when the sample is dried. The condensate tank 22 can collect the condensed liquid to prevent the condensate collected at the bottom of the vacuum box 2 from contacting the heating components 4.

[0024] like Figures 1 to 5As shown, the reflection assembly includes a reflection bracket 9 and a reflection layer 10. The reflection bracket 9 is fixedly connected to the corner of the vacuum box 2, and the reflection layer 10 is fixedly connected to the reflection bracket 9 on the side facing the inside of the vacuum box 2. The reflection layer 10 is arranged in an arc shape. A plurality of slots 11 are provided inside the vacuum box 2. A support plate 12 is detachably connected to the slot 11. The sample is placed on the support plate 12. The support plate 12 is arranged in a grid shape. In this embodiment, four reflection assemblies are provided, which are respectively arranged at the four corners inside the vacuum box 2. The temperature emitted by the heating component 4 can be transmitted to the sample above through the protective cover 8. The heat radiation and infrared rays emitted from the side of the protective cover 8 are refracted and transmitted through the reflection layer 10. The two reflection layers 10 arranged on the top of the vacuum box 2 can reflect the infrared rays facing upward toward the sample, so that the heat radiation and infrared rays in the entire vacuum box 2 are concentrated on the sample to heat the sample, reducing the heat heated in other positions in the vacuum box 2. The heating component 4 can reduce the heat emitted, thereby achieving energy saving effect.

[0025] like Figures 5 to 8 As shown, the heat storage mechanism also includes a support frame 13, a rotating rod 14, a reciprocating rotating device 16 and a reflecting layer 2 17. The support frame 13 is fixedly connected to the bottom of the vacuum box 2, and multiple heat storage blocks 5 are rotatably connected to the support frame 13. The rotating rod 14 is fixedly connected to both ends of the heat storage blocks 5. Connecting rods 15 are provided on both sides of the support frame 13. The connecting rods 15 are rotatably connected to the multiple rotating rods 14. The reciprocating rotating device 16 is provided at the bottom of the vacuum box 2. The reciprocating rotating device 16 is transmission-connected to the connecting rod 15. The reciprocating rotating device 16 can drive multiple heat storage blocks 5 through the connecting rod 15. The rotating rods 14 rotate simultaneously, and the reflecting layer 2 17 is fixedly arranged on the side of the multiple heat storage blocks 5 away from the protective cover 8. In this embodiment, the reciprocating rotating device 16 is configured to use a linkage rod to drive the connecting rod 15 to perform circular motion. The reciprocating rotating device 16 is provided with a motor for driving, and a manual driving method such as a remote control lever can also be used as appropriate to control the rotation of the heat storage block 5. The reciprocating rotating device 16 can drive multiple rotating rods 14 to rotate simultaneously. A variety of structures can be adopted without limitation. The driving device can be arranged outside the vacuum box 2 to avoid the influence of high temperature.

[0026] like Figure 7-Figure 8As shown, the heat storage block 5 is set to be circular, and a plurality of heat exchange grooves 18 are opened on the heat storage block 5. A heat insulation plate 19 is fixedly connected to one side of the heat storage block 5. The reciprocating rotary device 16 drives the plurality of heat storage blocks 5 to rotate. When the heat insulation plate 19 is close to the protective cover 8, the heat storage block 5 is between the heat insulation plate 19 and the reflective layer. The material of the heat storage block 5 is set to be a material that is not easy to dissipate heat. It absorbs heat during drying. After changing the sample, the vacuum pump 1 extracts the air in the vacuum box 2. After reaching a certain vacuum value, the fan 7 preheats the vacuum box 2 through the heat storage block 5. The air flow passes through the exchange The temperature is raised between the heat tank 18, and when the vacuum box 2 does not need to be preheated by the heat storage block 5, the heat storage block 5 is flipped so that the heat storage block 5 is between the heat insulation board 19 and the reflective layer 2 17, and the heat of the heat storage block 5 is reflected by the reflective layer 2 17 to reduce the heat loss of the heat storage block 5. Inclined reflective layers 3 23 are provided on both sides of the reflective layer 2 17. When the heat storage block 5 is rotated between the reflective layer 2 17 and the heat insulation board 19, the reflective layer 3 23 can reflect infrared rays and thermal radiation on the side of the reflective layer 2 17 to reduce the heat loss of the heat storage block 5.

[0027] like Figure 3~Figure 4 As shown, an air inlet 20 is provided above the ventilation duct 6, and an air outlet 21 is provided below. A plurality of fans 7 are fixedly installed at a position between the air inlet 20 and the air outlet 21 in the ventilation duct 6. The air outlet 21 is aligned with the opening on the side of the protective cover 8. The opening of the air inlet 20 is larger than the air outlet 21. The opening of the air inlet 20 is designed to be larger, and the air above the vacuum box 2 can be sucked in a large range, and the inside of the protective cover 8 is blown through the air outlet 21. The thin gas flows between the heating component 4 or the heat storage block 5 and circulates in the vacuum box 2, driving the heat near the sample to keep flowing, thereby avoiding the poor drying effect caused by the stagnation of gas near the sample.

[0028] like Figures 6 to 8 As shown, a groove is provided on the support frame 13, and the groove is aligned with the gap between the heat storage blocks 5. The reciprocating rotary device 16 drives the multiple heat storage blocks 5 to rotate. When the heat insulation plate 19 is away from the protective cover 8, the gas can flow between the heat exchange groove 18 and the protective cover 8. The provision of the groove can concentrate the airflow to flow between the heat storage blocks 5, fully contact with the heat exchange groove 18, and improve the efficiency of the air heating through the heat exchange groove 18.

[0029] In some examples, when drying the sample, after the vacuum pump 1 evacuates the vacuum box 2 to a certain vacuum degree, the fan 7 starts to drive the thin gas flow in the vacuum box 2, the heating component 4 is heated, and the heat storage block 5 is heated. The gas flows out through the air outlet 21 and passes through the heating component 4 and circulates in the vacuum box 2. The heat radiation and infrared rays generated by the heating component 4 are reflected onto the sample through the reflective layer 10. After the drying is completed, the reciprocating rotary device 16 drives the connecting rod 15 to perform a circular motion, and drives the heat storage block 5 to rotate through the rotating rod 14, so that the heat storage block 5 is between the heat insulation board 19 and the reflective layer 2 17. After the sample is changed and vacuumed, the reciprocating rotary device 16 drives the heat storage block 5 to rotate. At this time, the heat storage block 5 is between the heat insulation board 19 and the protective cover 8. The airflow at the air outlet 21 is heated through the heat exchange groove 18 to preheat the vacuum box 2, thereby achieving an energy-saving effect.

[0030] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure and are not limiting. Although the present disclosure has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present disclosure may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present disclosure, and all of these should be included in the scope of the claims of the present disclosure.

Claims

1. A waste heat utilization energy-saving vacuum drying oven, comprising a vacuum pump (1) and a vacuum box (2), wherein the vacuum box (2) is connected to the vacuum pump (1), the vacuum pump (1) is connected to the vacuum box (2), and a cabinet door (3) is rotatably provided at an opening position on the vacuum box (2), characterized in that: Also includes: A plurality of heating components (4) are provided, wherein the plurality of heating components (4) are provided at the bottom of the vacuum box (2), the sample is provided above the heating component (4), the plurality of heating components (4) are arranged in a surrounding manner, and the plurality of heating components (4) are arranged around a heat storage mechanism, wherein the heat storage mechanism includes a plurality of heat storage blocks (5), and the plurality of heat storage blocks (5) are rotatably provided below the plurality of samples, and the heat storage mechanism is used to store part of the heat generated by the heating component (4); The heat storage block (5) is capable of absorbing the heat generated by the plurality of heating components (4) and is used to preheat the interior of the vacuum box (2); A plurality of reflective components are provided, wherein the plurality of reflective components are fixedly connected to the vacuum box (2), and the reflective components are used to reflect infrared rays generated by the heating component (4); A ventilation duct (6) is fixedly connected to a side of the vacuum box (2) away from the cabinet door (3), and a plurality of fans (7) are provided in the ventilation duct (6). The fans (7) are used to drive the gas in the vacuum box (2) to flow.

2. The waste heat utilization energy-saving vacuum drying oven according to claim 1, characterized in that: The plurality of heating components (4) are arranged at the center of the bottom of the vacuum box (2); a protective cover (8) is fixedly connected to the bottom of the vacuum box (2); the protective cover (8) is arranged on the plurality of heating components (4); and an opening is provided on the side of the protective cover (8).

3. The waste heat utilization energy-saving vacuum drying oven according to claim 2, characterized in that: The reflective component comprises: A reflective bracket (9) fixedly connected to the corners of the vacuum box (2); The reflective layer (10) is fixedly connected to the reflective bracket (9) on a side facing the inside of the vacuum box (2), and the reflective layer (10) is configured to be in an arc shape.

4. The waste heat utilization energy-saving vacuum drying oven according to claim 3, characterized in that: A plurality of slots (11) are provided inside the vacuum box (2), and a support plate (12) is detachably connected to the slots (11). The sample is placed on the support plate (12), and the support plate (12) is arranged in a grid shape.

5. The waste heat utilization energy-saving vacuum drying oven according to claim 4, characterized in that: The heat storage mechanism further comprises: A support frame (13) is fixedly connected to the bottom of the vacuum box (2), and a plurality of heat storage blocks (5) are rotatably connected to the support frame (13); Rotating rods (14) are fixedly connected to both ends of the heat storage block (5), and connecting rods (15) are provided on both sides of the support frame (13), and the connecting rods (15) are rotatably connected to the plurality of rotating rods (14); A reciprocating rotating device (16) is arranged at the bottom of the vacuum box (2), the reciprocating rotating device (16) is in transmission connection with the connecting rod (15), and the reciprocating rotating device (16) can drive the plurality of rotating rods (14) to rotate simultaneously through the connecting rod (15); The second reflective layer (17) is fixedly arranged on a side of the plurality of heat storage blocks (5) away from the protective cover (8).

6. The waste heat utilization energy-saving vacuum drying oven according to claim 5, characterized in that: The heat storage block (5) is arranged in a circular shape, a plurality of heat exchange grooves (18) are provided on the heat storage block (5), and a heat insulation plate (19) is fixedly connected to one side of the heat storage block (5).

7. The waste heat utilization energy-saving vacuum drying oven according to claim 6, characterized in that: The reciprocating rotating device (16) drives the plurality of heat storage blocks (5) to rotate, and when the heat insulation plate (19) approaches the protective cover (8), the heat storage blocks (5) are located between the heat insulation plate (19) and the reflective layer.

8. The waste heat utilization energy-saving vacuum drying oven according to claim 7, characterized in that: An air inlet (20) is provided on the upper side of the ventilation duct (6), and an air outlet (21) is provided on the lower side. A plurality of fans (7) are fixedly installed in the ventilation duct (6) between the air inlet (20) and the air outlet (21). The air outlet (21) is aligned with the opening on the side of the protective cover (8), and the opening of the air inlet (20) is larger than the air outlet (21).

9. The waste heat utilization energy-saving vacuum drying oven according to claim 8, characterized in that: The support frame (13) is provided with a groove, and the groove is aligned with the gap between the heat storage blocks (5). The reciprocating rotary device (16) drives the plurality of heat storage blocks (5) to rotate. When the heat insulation plate (19) is away from the protective cover (8), the gas can flow between the heat exchange groove (18) and the protective cover (8).

10. The waste heat utilization energy-saving vacuum drying oven according to claim 2, characterized in that: A condensate tank (22) is provided at the bottom of the vacuum box (2), and the condensate tank (22) is arranged around the protective cover (8).

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