A vacuum drying oven

Abstract

The application discloses a vacuum drying box, which has very good technical effects by connecting the interface of the article (heat exchanger) with the vertical rod cavity through the connecting pipe and then designing the vertical rod cavity to be pumped. On one hand, the design can realize that the article rack is pulled out, the heat exchanger is placed, the connecting pipe is connected, and then the article rack is installed into the box, thereby greatly facilitating the use and the disassembly and assembly of the heat exchanger; on the other hand, the design can greatly reduce the pumping capacity, because the connecting pipe is connected with the pipeline, so that the pumping capacity is only the gas in the pipeline, and therefore the overall energy consumption is low, but the effect is better than that of pumping the whole box. The sealing connection module of the application adopts the connecting piece to realize the quick sealing connection between the transfer pipe and the connecting pipe and between the connecting pipe and the pumping pipe, and also utilizes the extrusion sealing of the sealing body and the pipe hole to realize the quick sealing of the box and the quick installation and removal of the article rack relative to the box.

Description

Technical Field

[0001] This invention relates to vacuum drying equipment, and more particularly to a vacuum drying oven. Background Technology

[0002] Testing a heat exchanger typically requires injecting water to check its sealing performance. After passing the test, the heat exchanger's pipes need to be dried. Currently, the main methods are air blowing or heating drying, but these methods are inefficient and have poor results.

[0003] Research has shown that if the drying speed is achieved by heating and evacuating air simultaneously, similar to the principle of a vacuum dryer, the drying effect is much faster and more effective for drying the inside of the pipes. However, there is currently no similar equipment available. Summary of the Invention

[0004] In view of the above-mentioned deficiencies of the prior art, the technical problem to be solved by the present invention is to provide a vacuum drying oven that can quickly dry items with internal pipes.

[0005] To achieve the above objectives, the present invention provides a vacuum drying oven for drying items, comprising a box body and a shelf. The box body is hollow inside, and the shelf is installed inside the box body. The shelf includes multiple vertical rods, each with its ends fixed to multiple horizontal rods. Multiple placement plates are also installed along the length of the vertical rods for placing heat exchangers to be dried. The items contain pipes with interfaces at both ends, such as heat exchangers.

[0006] One of the vertical rods has a hollow cavity inside, and multiple connectors are installed on this vertical rod. One end of the connector is connected to the vertical rod cavity; one end of the connector is connected to the inner end of the connecting pipe, and the other end of the connecting pipe is connected to the interface on the item. The vertical rod cavity is connected to a vacuum pump, which evacuates air from the vertical rod cavity.

[0007] As a further improvement of the present invention, the connector is hollow inside and is provided with a conical hole and a spacer ring. The conical hole can be pressed and sealed with the outer wall of the cone. The cone is installed on one end of the cone rod. The other end of the cone rod is fitted with a conical spring and passes through the spacer ring and can be axially slidably assembled with the spacer ring. The conical spring applies an elastic force to the cone to press against the conical hole. A sleeve is provided at one end of the connecting pipe, and a top pipe is provided inside the sleeve. A through groove is provided on the top pipe. The top pipe is inserted into the joint and squeezes the cone, causing the cone to overcome the elastic force of the cone spring and move towards the spacer ring, thereby releasing the seal between the cone and the cone hole. At this time, the connecting pipe is connected to the vertical rod cavity through the top pipe, the through groove, and the joint.

[0008] As a further improvement of the present invention, multiple pairs of placement rails are also installed along the length of the vertical rod. Each pair of placement rails includes at least two placement rails. A stop piece is provided on one end of each placement rail. A placement plate is installed on each pair of placement rails. The end of the placement plate is close to the stop piece to achieve positioning and stopping of the placement plate. A stop strip is provided on one end of the placement plate. The end of the placement plate with the stop strip is in contact with the stop piece.

[0009] As a further improvement of the present invention, two guide members are also installed on the inner bottom of the box. The guide members are provided with guide grooves, which are used to guide the rollers to achieve the positioning of the shelf and the box in the width direction. The rollers are installed at the bottom of the shelf.

[0010] As a further improvement of the present invention, two base strips are also installed on the inner bottom surface of the box body. The two base strips are respectively assembled and fixed to both sides of the bottom plate. Two sliding grooves are provided on the base strips. The two sliding grooves are respectively engaged with two sliding pins and slidably assembled. The sliding pins are installed on both sides of the pressure seat. The pressure seat is installed on the pressure member. The two sliding pins on each side of the pressure member are respectively engaged in the corresponding sliding grooves. The pressure-applying seat is also provided with a pressure-applying slider, which engages with and slides with a pressure-applying groove. The pressure-applying groove is provided on a lifting seat, which is provided on a pushing member. The pushing member is also provided with a shaft plate, which is assembled with one end of the optical shaft. The other end of the optical shaft passes through a first partition and is axially slidably assembled with it. The first partition is installed between two base strips. A pressure spring is also fitted on the portion of the optical shaft located between the shaft plate and the first partition. The pressure spring applies a spring force to the pushing member to push it. The pressure member presses against the flat rod at the bottom of the shelf to fix the shelf relative to the box body.

[0011] As a further improvement of the present invention, one end of the pusher is engaged and slidably mounted in the push-pull groove, the push-pull groove is provided on the pusher, the pusher is also assembled with one end of the leaf spring, and the other end of the leaf spring is assembled with the inner wall of the push-pull groove. The push-pull component is internally hinged to one end of the connecting rod via a pin, and the other end of the connecting rod is eccentrically hinged to the turntable via another pin. The turntable is mounted on a turntable shaft, which is rotatably mounted on the base plate. The turntable is eccentrically hinged to the cable shaft, and the cable shaft is assembled with one end of the cable. The other end of the cable passes around the guide wheel, passes through the second partition, and is then assembled with the handle. The guide wheel is rotatably mounted on the base plate, and the second partition is installed between two base strips.

[0012] As a further improvement of the present invention, a stop member is installed between the second partition and the handle. The stop member is installed on the housing and has a slot. Multiple cable protrusions are provided on the cable along its length, and the cable protrusions cannot pass through the slot.

[0013] As a further improvement of the present invention, the vertical rod cavity is connected to the vacuuming equipment through a sealing connection module. The sealing connection module includes a transfer tube communicating with the vertical rod cavity, a fitting installed on the housing, and a connecting pipe installed on the transfer tube. A sealing body is installed on the connecting pipe. The fitting has a hollow fitting hole inside. The sealing body is pressed and sealed with the fitting hole, and the end of the connecting pipe away from the transfer tube passes through the housing and is assembled with the vacuuming pipe. The vacuuming pipe is connected to the vacuuming equipment to evacuate the vertical rod cavity.

[0014] As a further improvement of the present invention, one end of the transfer tube is fixed to the corresponding vertical rod, and the other end is provided with a transfer tube ring. The transfer tube ring is pressed against one end of the pressure ring, and the other end of the pressure ring is pressed and sealed with the corresponding connecting tube ring. The connecting tube ring is provided on one end of the connecting tube, and another connecting tube ring is provided on the other end of the connecting tube. The pressure ring is provided with an outer ring, and sealing gaskets are installed at both ends of the outer ring. The connecting pipe ring and the transfer pipe ring are pressed onto the corresponding sealing gaskets to achieve a sealed connection between the connecting pipe and the transfer pipe. The connecting pipe ring and the transfer pipe ring are fitted with connecting parts, and the connecting pipe ring and the transfer pipe ring are assembled and fixed by pressing each other together through the connecting parts. The end of the connecting pipe away from the transfer pipe is sealed to the extraction pipe through another connector. An extraction pipe ring is provided on the end of the extraction pipe connected to the connecting pipe. The extraction pipe ring and the corresponding connecting pipe ring are squeezed together to achieve a seal. The connector includes two connecting parts. One end of each connecting part is hinged to both ends of the connecting block via corresponding connecting pins. One connecting part has a connecting notch on its other end, and the other connecting part is hinged to the rotating block via a rotating block pin. The rotating block is provided with a connecting screw. The connecting screw passes through the connecting notch and is tightened with a nut. The inner side of the connecting part is provided with a connecting groove, and the two sides of the connecting groove are provided with connecting inclined surfaces. The structure of the suction pipe ring, connecting pipe ring, and transfer pipe ring is the same. The outer wall of the connecting pipe ring is provided with an annular inclined surface. The connecting pipe ring, suction pipe ring, and pressure ring are all installed in the connecting groove, and the annular inclined surface and the outer wall of the suction pipe ring are all in close contact with the connecting inclined surface.

[0015] As a further improvement of the present invention, a pipe fitting arc block is provided on one end of the pipe fitting that protrudes from the box body, and an arc block surface is provided on the pipe fitting arc block. The two ends of the arc block surface gradually become thinner from one end to the other end in the axial direction of the pipe fitting. The arc block surface is in contact with the tensioning surface, the tensioning surface is provided on the tensioning block, the tensioning block is installed on the tensioning member, and there are two tensioning members. The tensioning member has a sliding part and a connecting part at both ends. The sliding part is axially slidably mounted on the sliding shaft. One end of the sliding shaft is mounted on the housing. The other end of the sliding shaft passes through the sliding part, is fitted with a sliding spring, and is assembled with a sliding nut. The sliding spring applies a spring force to the sliding part to prevent it from moving toward the sliding nut. The tensioning member is hinged to the housing through the sliding shaft. One of the tensioning components has a tensioning notch on its connecting part, and the other tensioning component is hinged to the tensioning block by a tensioning block pin. A tensioning screw is installed on the tensioning block. The tensioning screw passes through the tensioning notch, a pressure sleeve, and a tensioning spring before being assembled with a tensioning nut. The pressure sleeve is axially slidably fitted on the tensioning component. The tensioning spring applies a spring force to the pressure sleeve, pressing it against the tensioning notch. The end face of the tensioning member away from the tensioning block is pressed against the end face of the corresponding connecting part, which is a connector for connecting the air extraction pipe and the connecting pipe.

[0016] The beneficial effects of this invention are: This invention features a design that connects the interface of the item (heat exchanger) to the vertical rod cavity via a connecting pipe, and then evacuates the vertical rod cavity, resulting in excellent technical performance. Firstly, this design allows for easy removal of the shelf, placement of the heat exchanger, connection of the connecting pipe, and then insertion of the shelf back into the housing, greatly facilitating use and the assembly / disassembly of the heat exchanger. Secondly, this design significantly reduces the amount of air evacuated, as the connection to the pipeline means only the gas within the pipeline is evacuated, resulting in lower overall energy consumption while achieving better performance than evacuating the entire housing.

[0017] The sealing connection module of this invention uses connectors to achieve rapid sealing connections between the transfer pipe and the connecting pipe, and between the connecting pipe and the extraction pipe. It also utilizes the compression seal between the sealing body and the pipe fitting hole to achieve rapid sealing within the housing, and allows the shelf to be quickly inserted into and removed from the housing. Simultaneously, the tensioning member and the pipe fitting arc block cooperate to compress the corresponding connector, further tightening the sealing body and the pipe fitting hole, thereby greatly improving the sealing performance within the housing and also providing a fixing function for the shelf. Attached Figure Description

[0018] Figures 1-2 This is a schematic diagram of the structure of the present invention; Figure 3 This is a cross-sectional view of the present invention located at the center plane of the axis of turntable 550; Figure 4 This is a sectional view at the center plane of the placement plate 240; Figure 5 This is a cross-sectional view at the center plane where the 430 axis of the extraction pipe is located; Figure 6 yes Figure 5 Enlarged view of point A in the middle; Figure 7 yes Figure 5 Enlarged view at point B in the middle; Figure 8 yes Figure 7 Enlarged view at point C; Figures 9-10 This is a schematic diagram of the structure of the present invention after removing the door 120; Figures 11-12 This is a schematic diagram of the structure of the present invention after removing the door 120 and the box body 110; Figures 13-14 This is a structural diagram of the shelf 200, guide 160, and base strip 150. Figures 15-16 This is a structural diagram of guide component 160 and base strip 150; Figure 17 This is a structural diagram of the base strip 150, turntable 550, and pressure-applying component 510. Figures 18-19 This is a structural diagram of the pressure-applying component 510 and the cable 810; Figure 20 This is a structural diagram of cable 810 and the 590-point winding wheel; Figures 21-23 This is a schematic diagram of the sealing connection module. Figures 24-25 This is a schematic diagram of the structure of the connector 300 and tensioner 710 in the sealing connection module after they are opened; Figures 26-27 This is a structural diagram of fitting 140 and tensioner 710; Figures 28-29 This is a structural diagram of connector 300, transfer tube 280, pressure ring 440, and intermediate tube 410. Figure 30 This is a cross-sectional view of the tensioning member 710, the sliding shaft 720, and the tensioning member 730 located at the center plane of the axis of the tensioning screw 731; Figures 31-32 This is a structural diagram of the 200-point shelving unit; Figure 33 This is a structural diagram of the placement plate 240 and the placement rail 230. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0020] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0021] This embodiment is an improvement on an existing vacuum drying oven; therefore, for parts not described herein, an existing vacuum drying oven can be used directly.

[0022] See Figures 1-15 The vacuum drying oven of this embodiment includes a box body 110, a door 120, and a shelf 200. The box body 110 is hollow inside and open on one side. The open side of the box body 110 is closed by the door 120. One side of the door 120 is hinged to the box body 110, and the other side is locked to the box body 110 by a door lock. After the door lock is opened, the door 120 can be rotated relative to the box body 110 with the hinge as the center. This is prior art, and relevant technologies of existing walk-in drying ovens or test chambers can be used.

[0023] The inner sides of the box 110 are also equipped with air distribution plates 130. The air distribution plates 130 are provided with several through air distribution holes. When in use, the hot air blown out of the drying box passes through the air distribution holes and is evenly blown onto the heat exchanger 900 on the shelf 200.

[0024] Two base strips 150 and two guide members 160 are also installed on the inner bottom surface of the housing 110. The guide members 160 are provided with guide grooves 161, which are used to guide the rollers 250 to achieve the positioning of the shelf 200 and the housing 110 in the width direction. Figure 4 (in the left and right direction). A guide groove 111 is formed between the two base strips 150 and the inner wall of the housing 110, and the guide member 160 is installed in the guide groove 111.

[0025] See Figures 1-15 , Figures 31-33 The shelf 200 includes at least four vertical rods 210. The two ends of the vertical rods 210 are respectively assembled and fixed to multiple horizontal rods 220. The bottom of the horizontal rods 220 or the bottom of the vertical rods 210 is assembled with rollers 250 so that the rollers 250 support the entire shelf 200. When in use, the rollers 250 are used to roll to facilitate the movement of the shelf 200.

[0026] Multiple pairs of placement rails are also installed along the length of the vertical rod 210. Each pair of placement rails includes at least two placement rails 230. A stop piece 231 is provided on one end of each placement rail. A placement plate 240 is installed on each pair of placement rails. The end of the placement plate 240 is close to the stop piece 231 to achieve positioning and stopping of the placement plate 240.

[0027] A baffle 241 is provided on one end of the placement plate 240 to prevent the heat exchanger 900 from sliding out of the placement plate 240. The end of the placement plate 240 with the baffle 241 is in contact with the stop piece 231, thereby preventing the heat exchanger 900 from sliding out of the stop piece 231 when the placement plate 240 is installed on the placement rail 230.

[0028] See Figures 3-6 One of the vertical rods 210 has a hollow vertical rod cavity 211 inside, and multiple connectors 270 are installed on this vertical rod 210. One end of the connector 270 is connected to the vertical rod cavity 211; one end of the connector 270 is connected to the connecting pipe 260, and the other end of the connecting pipe 260 is connected to the interface on the heat exchanger 900. The vertical rod cavity 211 is connected to a vacuum pump. The vacuum pump pumps air from the vertical rod cavity 211 to achieve air evacuation from the pipes of the heat exchanger 900. At this time, combined with heating the heat exchanger 900, the pipes of the heat exchanger 900 can be dried quickly.

[0029] The heat exchanger 900 typically has two sets of pipes corresponding to the input and output fluids, thus achieving heat exchange. In actual drying, there are two options: one is to connect the connecting pipe 260 to one port of each of the two sets of pipes while keeping the other port open, allowing hot air to be quickly drawn into the pipes for rapid drying during evacuation. The other option is to connect both ends of the pipes to the connecting pipe 260, creating a vacuum inside the pipes, which, combined with heating, quickly removes water vapor, achieving rapid drying. This embodiment uses the latter method.

[0030] The design of connecting the heat exchanger 900's interface to the vertical rod cavity 211 via the connecting pipe 260, and then evacuating the vertical rod cavity 211, has excellent technical advantages. Firstly, this design allows the shelf 200 to be pulled out, the heat exchanger 900 placed inside, the connecting pipe 260 connected, and the shelf 200 then installed into the housing 110, greatly facilitating use and the assembly / disassembly of the heat exchanger 900. Secondly, this design significantly reduces the amount of air evacuation required. Because the connecting pipe 260 connects to the pipeline, only the gas within the pipeline is evacuated, resulting in lower overall energy consumption while achieving better performance than evacuating the entire housing 110.

[0031] The connector 270 is hollow inside and is provided with a conical hole 271 and a spacer ring 272. The conical hole 271 can be pressed and sealed with the outer wall of the cone 273. The cone 273 is installed on one end of the conical rod 274. The other end of the conical rod 274 is fitted with a conical spring 275 and passes through the spacer ring 272 and can be axially slidably assembled with the spacer ring 272. The conical spring 275 applies a spring force to the cone 273 to press against the conical hole 271, thereby ensuring that the cone 273 and the conical hole 271 are pressed and sealed.

[0032] One end of the connecting pipe 260 is provided with a sleeve 261, and a top pipe 262 is provided inside the sleeve 261. The top pipe 262 is provided with a through groove 263. The top pipe 262 is inserted into the connector 270 and presses the cone 273, causing the cone 273 to overcome the elastic force of the cone spring 275 and move towards the spacer ring 272, thereby releasing the seal between the cone 273 and the cone hole 271. At this time, the connecting pipe 260 is connected to the vertical rod cavity 211 through the top pipe 262, the through groove 263, and the connector 270. In this embodiment, a threaded sleeve can be provided on the other end of the connecting pipe 260, so that the threaded sleeve can be screwed into the thread on the interface for assembly, similar to the connection structure of a shower hose.

[0033] See Figures 3-14 , Figures 21-30 The vertical rod cavity 211 is connected to a vacuum pumping device via a sealing connection module. The vacuum pumping device can be a Roots pump, a vacuum pump, a negative pressure pump, etc.

[0034] The sealing connection module includes a transfer pipe 280 communicating with the vertical rod cavity 211 and a pipe fitting 140 installed on the housing 110. One end of the transfer pipe 280 is fixed to the corresponding vertical rod 210, and the other end is provided with a transfer pipe ring 281. The transfer pipe ring 281 is pressed against one end of the pressure ring 440. The other end of the pressure ring 440 is pressed and sealed with the corresponding connecting pipe ring 411. The connecting pipe ring 411 is provided on one end of the connecting pipe 410, and another connecting pipe ring 411 is provided on the other end of the connecting pipe 410.

[0035] The pressure ring 440 is provided with an outer ring 441, and sealing gaskets 442 are respectively installed on both ends of the outer ring 441. The connecting pipe ring 411 and the transfer pipe ring 281 are respectively pressed on the corresponding sealing gaskets 442 to achieve a sealed connection between the connecting pipe 410 and the transfer pipe 280. The connecting pipe ring 411 and the transfer pipe ring 281 are fitted with a connector 300, and the connecting pipe ring 411 and the transfer pipe ring 281 are assembled and fixed by pressing each other through the connector 300.

[0036] A sealing body 420 is installed on the connecting pipe 410. An outer conical surface 421 is provided on the outer wall of the sealing body 420. The pipe fitting 140 has a hollow pipe fitting hole 141, and an inner conical surface 1411 is provided inside the pipe fitting hole 141. The outer conical surface 421 and the inner conical surface 1411 are pressed together for sealing. In this embodiment, the sealing body 420 can be made of a soft, elastic material, such as rubber or silicone. Alternatively, it can be made of metal; in this case, a sealing sleeve made of a soft, elastic material can be fitted over the sealing body 420.

[0037] The end of the connecting pipe 410 away from the transfer pipe 280 is sealed to the vacuum pipe 430 via another connector 300. The vacuum pipe 430 is connected to a vacuum pump to evacuate the vertical rod cavity 211. A vacuum pipe ring 431 is provided on the end of the vacuum pipe 430 connected to the connecting pipe 410. The vacuum pipe ring 431 and the corresponding connecting pipe ring 411 are pressed together to form a corresponding pressure ring 440 to achieve a seal.

[0038] See Figures 21-25 The connector 300 includes two connecting parts 310. One end of each connecting part 310 is hinged to both ends of the connecting block 350 via a corresponding connecting pin 320. One connecting part 310 has a connecting notch 312 on its other end, and the other connecting part 310 is hinged to the rotating block 330 via a rotating block pin 332. The rotating block 330 is provided with a connecting screw 331. After passing through the connecting notch 312, the connecting screw 331 is tightened with the nut 340, thereby clamping the two connecting parts 310 outside the corresponding suction pipe ring 431 and connecting pipe ring 411 or outside the connecting pipe ring 411 and transfer pipe ring 281.

[0039] Combination Figure 8 The inner side of the connecting part 310 is provided with a connecting groove 311, and the two sides of the connecting groove 311 are provided with connecting inclined surfaces 3111. The structures of the suction pipe ring 431, the connecting pipe ring 411, and the transfer pipe ring 281 are the same. The outer wall of the connecting pipe ring 411 is provided with an annular inclined surface 4111. The connecting pipe ring 411, the suction pipe ring 431, and the pressure ring 440 are all installed in the connecting groove 311, and the annular inclined surface 4111 and the outer wall of the suction pipe ring 431 are tightly attached to the connecting inclined surface 3111, thereby realizing that the connecting member 300 presses the suction pipe ring 431 and the connecting pipe ring 411 together. The connection structure of the connecting pipe ring 411 and the transfer pipe ring 281 is the same as the above connection structure.

[0040] In use, the pressure ring 440 is first installed between the connecting pipe ring 411 and the suction pipe ring 431. Then, the connecting groove 311 is fitted over the connecting pipe ring 411, the suction pipe ring 431, and the pressure ring 440. Finally, the connecting screw 331 is passed through the connecting notch 312 and tightened with the nut 340. During this process, the connecting bevel 3111 engages with the outer wall of the ring bevel 4111 and the suction pipe ring 431, applying axial pressure to the connecting pipe ring 411 and the suction pipe ring 431, thus pressing the ring bevel 4111 and the suction pipe ring 431 tightly against their corresponding sealing gaskets 442. Furthermore, due to the axial restriction of the connecting pipe ring 411 and the suction pipe ring 431 by the connecting groove 311, the connecting pipe 410 and the suction pipe 430 are axially connected and fixed, thus possessing a certain axial tensile strength. This design is not only easy to assemble and disassemble but also achieves good connection and sealing effects, while being simple in structure and durable.

[0041] See Figures 3-14 , Figures 21-30 The pipe fitting 140 has an arc block 142 at one end that protrudes from the housing 110. The arc block 142 has an arc surface 1421. The two ends of the arc surface 1421 gradually thin from one end to the other in the axial direction of the pipe fitting 140. The arc surface 1421 is in contact with the tensioning surface 7111. The tensioning surface 7111 is set on the tensioning block 711. The tensioning block 711 is installed on the tensioning member 710. There are two tensioning members 710. The tensioning surface 7111 and the arc block surface 1421 can be regarded as an integral part of the pipe fitting arc block 142 and the tensioning block 711. They are cut into two parts along the tensioning surface 7111 and the arc block surface 1421, and the cut surface is an inclined surface (inclined along the axial direction of the pipe fitting 140). This causes the tensioning surface 7111 to be gradually squeezed by the arc block surface 1421 when it rotates relative to the arc block surface 1421. Finally, the tensioning surface 7111 is pushed by the arc block surface 1421 in the axial direction of the pipe fitting 140 away from the pipe fitting 140.

[0042] The tensioning member 710 has a sliding part 712 and a connecting part 713 respectively provided at both ends. The sliding part 712 is axially slidably mounted on the sliding shaft 720. One end of the sliding shaft 720 is mounted on the housing 110. The other end of the sliding shaft 720 passes through the sliding part 712, is fitted with a sliding spring 640, and is assembled with a sliding nut 721. The sliding spring 640 applies a spring force to the sliding part 712 to prevent it from moving toward the sliding nut 721.

[0043] One of the tensioning components 710 has a tensioning notch 7131 on its connecting portion 713. The connecting portion 713 of the other tensioning component 710 is hinged to the tensioning block 730 via a tensioning block pin 732. A tensioning screw 731 is installed on the tensioning block 730. The tensioning screw 731 passes through the tensioning notch 7131, a sleeve 740, and a tensioning spring 630 before being assembled with a tensioning nut 733. The sleeve 740 is axially slidably fitted onto the tensioning screw 731. The tensioning spring 630 applies a spring force to the sleeve 740 to press against the tensioning notch 7131, so that the sleeve 740 is pressed against the connecting portion 713 corresponding to the tensioning notch 7131, thereby maintaining the locked state of the two tensioning components 710.

[0044] The end face of the tensioning member 710 away from the tensioning block 711 is pressed against the end face of the corresponding connecting part 310. This connecting part 310 is one of the connecting parts 300 that connect the air extraction pipe 430 and the connecting pipe 410. In use, the tensioning member 710 is displaced axially in the pipe 140 by pressing against the pipe arc block 142, thereby pressing the corresponding connecting part 300. This applies a pulling force to the shelf 200 through the connecting pipe 410, causing the sealing body 420 to be further pressed against the inner conical surface 1411, thus ensuring the tight sealing between the inner conical surface 1411 and the sealing body 420.

[0045] See you Figure 30 Preferably, the sliding portions 712 of the two tensioning members 710 are also pressed against both ends of the opening spring 650, which is in the locked state when the two tensioning members 710 are in the locked state. Figure 30 (State) Under the pressure of the storage elastic force, after the two tensioning parts 710 are unlocked, they will rotate away from each other under the elastic force of the opening spring 650, so as not to interfere with the movement of the connecting pipe 410 into the housing 110.

[0046] When the shelf 200 needs to be removed, move the pressure sleeve 740 toward the tension nut 733 so that the pressure sleeve 740 compresses the tension spring 630 and moves it away from the corresponding connecting part 713. Then, rotate the tension screw 731 so that it rotates out of the tension notch 7131. The sliding spring 640 pushes the tensioning member 710 toward the box 110 so that the compressive force between the tensioning member 710 and the corresponding connecting member 300 is reduced. Then, rotate to open the two tensioning members 710 to release the tension on the sealing body 420. Open the connecting piece 300 connecting the exhaust pipe 430 and the connecting pipe 410 so that the exhaust pipe 430 and the connecting pipe 410 are separated. Then, open the box door 120 and pull out the shelf 200. When it is necessary to disassemble the connecting pipe 410 (such as to replace the sealing body 420), simply open the connecting piece 300 connecting the connecting pipe 410 and the transfer pipe 280 and then remove the connecting pipe 410.

[0047] The biggest advantage of this design is its ease of installation and use. It eliminates the need for complex piping on the housing 110. Instead, the heat exchanger 900 is placed on the shelf 200 and connected to the connecting pipe 260. The shelf 200 is then inserted into the housing 110, ensuring the sealing body 420 is pressed tightly against the inner conical surface 1411. The exhaust pipe 430 and connecting pipe 410 are then connected using the connector 300. Finally, the two tensioning members 710 are rotated to lock them in place. Figure 30 In this state, the two tensioning members 710 undergo axial displacement to compress the corresponding connecting member 300, thereby pulling the sealing body 420 into the inward conical surface 1411 to further increase the sealing performance. The two tensioning members 710 are designed to be movable along the sliding shaft mainly to account for the possibility that the corresponding connecting member 300 may be located inside the two tensioning members 710 when not tensioned. Figure 30 The state of the two tensioning members 710 affects their rotation and locking. In the initial state, the two tensioning members 710 are closest to the housing. Only when the two tensioning members 710 move closer to each other and rotate to lock do they gradually enter the end face of the connector 300 and press against it, thereby reducing the probability of interference and greatly facilitating use.

[0048] See Figures 3-20 Two base strips 150 are respectively assembled and fixed to both sides of the base plate 154. Two sliding grooves 151 are provided on the base strips 150. The two sliding grooves 151 are respectively engaged with two sliding pins 512 and slidably assembled. The sliding pins 512 are installed on both sides of the pressure seat 511. The pressure seat 511 is installed on the pressure member 510. The two sliding pins 512 on each side of the pressure member 510 are respectively engaged into the corresponding sliding grooves 151.

[0049] The pressure seat 511 is also provided with a pressure slider 513, which engages with and slides with the pressure groove 522. The pressure groove 522 is provided on the lifting seat 521, which is provided on the pusher 520. The pusher 520 is also provided with a shaft plate 523, which is assembled with one end of the optical shaft 611. The other end of the optical shaft 611 passes through the first partition 152 and is axially slidably assembled with it. The first partition 152 is installed between two base strips 150. The portion of the optical shaft 611 located between the shaft plate 523 and the first partition 152 is also fitted with a pressure spring 610. The pressure spring 610 applies a spring force to the pusher 520 to push the pressure member 510.

[0050] The pressure member 510 presses against the flat bar 220 at the bottom of the shelf 200 so that the shelf 200 is fixed relative to the box 110 in the length direction of the guide groove 161. This design is mainly to avoid the shelf 200 from slipping during use, which may cause safety hazards or affect the use.

[0051] The pusher 520 is slidably mounted in the push-pull groove 531 at one end, which is located on the pusher 530. The pusher 520 is also fitted to one end of a leaf spring 620, and the other end of the leaf spring 620 is fitted to the inner wall of the push-pull groove 531. This allows the pusher 530 to compress the leaf spring 620 when moving towards the pressure member 510, and to pull the leaf spring 620 when moving away from the pressure member 510. After a small deformation, the leaf spring 620 moves along with the pusher 530, thus moving the pusher 520. In this embodiment, the elastic coefficient of the leaf spring 620 should be as large as possible to reduce its extension and contraction, ensuring that the pusher 530 is pulled and pushed by the leaf spring 620. This can be achieved through a limited number of experiments, and the leaf spring 620 essentially acts as a buffer connection; a similar effect can be achieved using an elastic airbag.

[0052] The push-pull component 530 is internally hinged to one end of the connecting rod 540 via a pin, and the other end of the connecting rod 540 is eccentrically hinged to the turntable 550 (not on the same axis) via another pin. The turntable 550 is mounted on the turntable shaft 551, which is rotatably mounted on the base plate 154. The turntable 550 is eccentrically hinged to the cable shaft 812, which is fitted with one end of the cable 810. The other end of the cable 810 passes over the guide wheel 560, exits the second partition 153, passes through the slot 571, and is fitted with the handle 580. The cable 810 has multiple cable protrusions 811 along its length. The cable protrusions 811 cannot pass through the slots 571. The slots 571 are located on the stop member 570, which is mounted on the housing 110. The guide wheel 560 is rotatably mounted on the base plate 154. The second partition 153 is mounted between the two base strips 150. The housing 110 is also equipped with a winding wheel 590 near the stop member 570. The winding wheel 590 is used to wind the cable 810 for storage.

[0053] Figures 15-17This demonstrates the usage state. In this state, the pressure-applying component 510 presses the corresponding flat bar 220 towards the pipe fitting 140. To pull out the shelf 200, hold the handle 580 and pull the cable 810 upwards, causing it to exit the slot 571. Then pull the cable 810 outwards. The cable 810 drives the turntable 550 to rotate. The turntable 550, via the connecting rod 540, moves the push-pull component 530 towards the second partition 153. The push-pull component 530 moves the pushing component 520 synchronously, which in turn moves the pressure-applying component 510 synchronously. The sliding pin 512 engages with the sliding groove 151 to gradually move the pressure-applying component 510 away from the corresponding flat bar 220 and downwards. The slider 513 slides against the pressure groove 522 to counteract the vertical displacement of the pressure member 510 and the pusher 520 until the pressure member 510 is not higher than the bottom surface of the corresponding flat rod 220. At this time, the cable protrusion 811 closest to the slot 571 is pulled to the side of the slot 571 away from the second partition 153, and then the cable 810 is inserted into the slot 571. The cable 810 is released. Since the cable protrusion 811 is locked with the slot 571, the cable cannot move in the opposite direction to reset. The pulled-out cable is wrapped around the winding wheel 590 to avoid affecting the use.

[0054] After placing the shelf 200, remove the cable wrapped around the wheel 590, pull the cable out of the slot 571, and release the cable. The pressure spring 610 and the leaf spring 620 both apply pressure to the pusher 520, pushing it towards the corresponding flat rod 220. The pressure member 510 gradually moves upward along the slide groove 151 and presses against the flat rod 220. The leaf spring 620 is designed to compress and allow for clearance when the pressure between the pressure member 510 and the flat rod 220 is too great, reducing the difficulty of adjusting the dimensions of the turntable 550, connecting rod 540, and push-pull member 530, and achieving greater error tolerance. This avoids problems such as jamming and incomplete movement caused by deformation due to prolonged high-temperature use. The turntable indirectly drives the connecting rod to rotate, mainly using the lever principle to reduce the force required to operate the push-pull member 530, thus facilitating use.

[0055] Any aspects of this invention not described in detail are well-known to those skilled in the art.

[0056] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A vacuum drying oven for drying items, characterized in that: The device includes a housing and a shelf. The housing is hollow inside, and the shelf is installed inside the housing. The shelf includes multiple vertical rods, and the two ends of each vertical rod are respectively assembled and fixed to multiple horizontal rods. Multiple placement plates are also installed along the length of the vertical rods. The placement plates are used to place heat exchangers that need to be dried. One of the vertical rods has a hollow cavity inside, and multiple connectors are installed on this vertical rod. One end of the connector is connected to the vertical rod cavity; one end of the connector is connected to the inner end of the connecting pipe, and the other end of the connecting pipe is connected to the interface on the item. The vertical rod cavity is connected to a vacuum pumping device, which evacuates air from the vertical rod cavity. The connector is hollow inside and is provided with a conical hole and a spacer ring. The conical hole can be pressed and sealed with the outer wall of the cone. The cone is installed on one end of the cone rod. The other end of the cone rod is fitted with a conical spring and passes through the spacer ring and can be axially slidably assembled with the spacer ring. The conical spring applies an elastic force to the cone to press it into the conical hole. A sleeve is provided at one end of the connecting pipe, and a top pipe is provided inside the sleeve. A through groove is provided on the top pipe. The top pipe is inserted into the joint and squeezes the cone, causing the cone to overcome the elastic force of the cone spring and move towards the spacer ring, thereby releasing the seal between the cone and the cone hole. At this time, the connecting pipe is connected to the vertical rod cavity through the top pipe, the through groove, and the joint. The vertical rod cavity is connected to the vacuuming equipment via a sealing connection module. The sealing connection module includes a transfer tube communicating with the vertical rod cavity, a fitting mounted on the housing, and a connecting pipe mounted on the transfer tube. A sealing body is installed on the connecting pipe. The fitting has a hollow fitting hole inside. The sealing body is pressed tightly against the fitting hole to seal it. The end of the connecting pipe away from the transfer tube extends out of the housing and is assembled with the vacuum pipe. The vacuum pipe is connected to the vacuuming equipment to evacuate the vertical rod cavity. One end of the transfer tube is fixed inside the corresponding vertical rod. A transfer tube ring is provided at the other end of the transfer tube. The transfer tube ring is pressed against one end of the pressure ring. The other end of the pressure ring is pressed and sealed with the corresponding connecting tube ring. This connecting tube ring is provided at one end of the connecting tube, and another connecting tube ring is provided at the other end of the connecting tube. The pressure ring is provided with an outer ring, and sealing gaskets are installed at both ends of the outer ring. The connecting pipe ring and the transfer pipe ring are pressed onto the corresponding sealing gaskets to achieve a sealed connection between the connecting pipe and the transfer pipe. The connecting pipe ring and the transfer pipe ring are fitted with connecting parts, and the connecting pipe ring and the transfer pipe ring are assembled and fixed by pressing each other together through the connecting parts. The end of the connecting pipe away from the transfer pipe is sealed to the extraction pipe through another connector. An extraction pipe ring is provided on the end of the extraction pipe connected to the connecting pipe. The extraction pipe ring and the corresponding connecting pipe ring are squeezed together to achieve a seal. The connector includes two connecting parts. One end of each connecting part is hinged to both ends of the connecting block via corresponding connecting pins. One connecting part has a connecting notch on its other end, and the other connecting part is hinged to the rotating block via a rotating block pin. The rotating block is provided with a connecting screw. The connecting screw passes through the connecting notch and is tightened with a nut. The inner side of the connecting part is provided with a connecting groove, and the two sides of the connecting groove are provided with connecting inclined surfaces. The structure of the suction pipe ring, connecting pipe ring, and transfer pipe ring is the same. The outer wall of the connecting pipe ring is provided with an annular inclined surface. The connecting pipe ring, suction pipe ring, and pressure ring are all installed in the connecting groove, and the annular inclined surface and the outer wall of the suction pipe ring are all in close contact with the connecting inclined surface. The pipe fitting has an arc block at one end that protrudes from the box. The arc block has an arc surface, and the two ends of the arc surface gradually thin from one end to the other along the pipe fitting axis. The arc surface is in contact with the tensioning surface, which is set on the tensioning block. The tensioning block is installed on the tensioning member, and there are two tensioning members. The tensioning member has a sliding part and a connecting part at both ends. The sliding part is axially slidably mounted on the sliding shaft. One end of the sliding shaft is mounted on the housing. The other end of the sliding shaft passes through the sliding part, is fitted with a sliding spring, and is assembled with a sliding nut. The sliding spring applies a spring force to the sliding part to prevent it from moving toward the sliding nut. The tensioning member is hinged to the housing through the sliding shaft. One of the tensioning components has a tensioning notch on its connecting part, and the other tensioning component is hinged to the tensioning block by a tensioning block pin. A tensioning screw is installed on the tensioning block. The tensioning screw passes through the tensioning notch, a pressure sleeve, and a tensioning spring before being assembled with a tensioning nut. The pressure sleeve is axially slidably fitted on the tensioning component. The tensioning spring applies a spring force to the pressure sleeve, pressing it against the tensioning notch. The end face of the tensioning member away from the tensioning block is pressed against the end face of the corresponding connecting part, which is a connector for connecting the air extraction pipe and the connecting pipe.

2. The vacuum drying oven as described in claim 1, characterized in that: Multiple pairs of placement rails are also installed along the length of the vertical rod. Each pair of placement rails includes at least two placement rails. A stop piece is provided on one end of each placement rail. A placement plate is installed on each pair of placement rails. The end of the placement plate is close to the stop piece to achieve positioning and stopping of the placement plate. A stop strip is provided on one end of the placement plate. The end of the placement plate with the stop strip is close to the stop piece.

3. The vacuum drying oven as described in claim 1, characterized in that: Two guides are also installed on the inner bottom of the cabinet. The guides are provided with guide grooves, which are used to guide the rollers to achieve the positioning of the shelf and the cabinet in the width direction. The rollers are installed at the bottom of the shelf.

4. The vacuum drying oven as described in any one of claims 1-3, characterized in that: Two base strips are also installed on the inner bottom surface of the box. The two base strips are respectively assembled and fixed to both sides of the bottom plate. Two sliding grooves are provided on the base strips. The two sliding grooves are respectively engaged with two sliding pins and slidably assembled. The sliding pins are installed on both sides of the pressure seat. The pressure seat is installed on the pressure component. The two sliding pins on each side of the pressure component are respectively engaged into the corresponding sliding grooves. The pressure-applying seat is also provided with a pressure-applying slider, which engages with and slides with a pressure-applying groove. The pressure-applying groove is provided on a lifting seat, which is provided on a pushing member. The pushing member is also provided with a shaft plate, which is assembled with one end of the optical shaft. The other end of the optical shaft passes through a first partition and is axially slidably assembled with it. The first partition is installed between two base strips. A pressure spring is also fitted on the portion of the optical shaft located between the shaft plate and the first partition. The pressure spring applies a spring force to the pushing member to push it. The pressure member presses against the flat rod at the bottom of the shelf to fix the shelf relative to the box body.

5. The vacuum drying oven as described in claim 4, characterized in that: One end of the pusher is engaged and slidably installed in the push-pull groove, which is provided on the pusher. The pusher is also assembled with one end of a leaf spring, and the other end of the leaf spring is assembled with the inner wall of the push-pull groove. The push-pull component is internally hinged to one end of the connecting rod via a pin, and the other end of the connecting rod is eccentrically hinged to the turntable via another pin. The turntable is mounted on a turntable shaft, which is rotatably mounted on the base plate. The turntable is eccentrically hinged to the cable shaft, and the cable shaft is assembled with one end of the cable. The other end of the cable passes around the guide wheel, passes through the second partition, and is then assembled with the handle. The guide wheel is rotatably mounted on the base plate, and the second partition is installed between two base strips.

6. The vacuum drying oven as described in claim 5, characterized in that: A stop is installed between the second partition and the handle. The stop is installed on the housing and has a slot. Multiple cable protrusions are provided on the cable along its length. The cable protrusions cannot pass through the slot.

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