Vacuum freeze dryer

Abstract

The utility model relates to the technical field of drying equipment, in particular to a vacuum freeze dryer which comprises a cabinet and a freeze drying cabin installed on the cabinet, and the freeze drying cabin comprises a drying cabin body, a cabin door and a cabin door driving mechanism arranged between the drying cabin body and the cabin door. A cabin door driving mechanism is arranged between a drying cabin body and a cabin door of the freeze drying cabin, a flange disc and a flange are arranged on the drying cabin body and the cabin door respectively, a sealing ring, an air channel, an air pump and a compressed air source are arranged between the flange disc and the flange, and the air channel, the air pump and the compressed air source are communicated with the sealing ring. The sealing ring is expanded to be tightly attached to the flange disc and the flange when bearing large compressed gas pressure, automatic opening and closing of the cabin door and automatic sealing of the freeze drying cabin are achieved, and the problem that pollution is prone to being caused in the material freeze drying process is solved.

Description

Technical Field

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

[0002] A vacuum freeze dryer (abbreviated as vacuum freeze dryer) is a machine that places frozen water-containing items under vacuum conditions, heats the items, and the water in the items is sublimated and captured by cold hydrazine to achieve dehydration and drying of the items. Vacuum freeze dryers are widely used in the dehydration and drying of materials such as medicines, Chinese herbal medicines, fruits, vegetables, meat, plants, flowers, and chemicals. The existing vacuum freeze dryer structure generally includes a freeze drying chamber, a refrigeration system, a heating system, and a vacuum system. The items to be freeze-dried are placed in the freeze drying chamber, and the vacuum system is used to evacuate the vacuum system, and the heating system heats the items. The door of the freeze drying chamber of the existing vacuum freeze dryer is generally fastened with a handle and opened manually. When feeding the vacuum freeze dryer, the door must be opened manually, but manual control of the door opening and closing will be slow and easy to cause pollution. Utility Model Content

[0003] The utility model aims to provide a vacuum freeze dryer to overcome the problems existing in the existing equipment.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is as follows: a vacuum freeze dryer, comprising a cabinet and a freeze drying chamber installed on the cabinet, the freeze drying chamber comprising a drying chamber body, a chamber door and a chamber door driving mechanism arranged between the drying chamber body and the chamber door, one end of the drying chamber body is an open end, the outer edge of the open end of the drying chamber body is provided with a flange plate, the flange plate comprises an annular flange plate body and a plurality of flange plate teeth extending from the outer edge of the flange plate body and bent inwardly, the plurality of flange plate teeth are equidistantly spaced from each other along the circumferential direction, so as to form a first notch between two adjacent flange plate teeth; the flange plate body has a joint surface engaged with the chamber door, and a clamping groove is formed between the joint surface of the flange plate body and the flange plate teeth;

[0005] The joint surface of the flange body is provided with an annular groove, a sealing ring is provided in the annular groove, and an annular sealing groove is provided inside the sealing ring; the flange body is provided with an air passage, the air passage has an air inlet end and an air outlet end connected with the annular groove and the sealing groove of the sealing ring, and the air inlet end of the air passage is connected with an air pump and a compressed air source through an air pipe;

[0006] The hatch is arranged at the opening end of the drying cabin body, and a flange is arranged on the outer edge of the hatch, wherein the flange comprises an annular flange body and a plurality of flange teeth extending radially outward from the outer edge of the flange body, wherein the plurality of flange teeth are equidistantly spaced from each other, and a second notch is formed between two adjacent flange teeth;

[0007] The hatch drive mechanism is used to open and close the hatch, and includes a drive arm, a first connecting arm, a second connecting arm, a hydraulic cylinder and a motor. A piston rod is provided at one end of the hydraulic cylinder. The motor is fixedly mounted at one end of the drive arm. The output shaft of the motor is connected to the center of the hatch. The other end of the drive arm is connected to one end of the second connecting arm. One end of the second connecting arm is connected to one end of the first connecting arm through a first hinge shaft. The other end of the second connecting arm is connected to the hydraulic cylinder through a second hinge shaft. The other end of the first connecting arm is connected to the drying cabin body. The hydraulic cylinder drives the second connecting arm to rotate around the first hinge shaft to drive the drive arm to move closer to or away from the drying cabin body, thereby opening and closing the hatch.

[0008] The multiple flange teeth of the hatch flange can be correspondingly embedded in the multiple first notches of the flange plate of the drying cabin body, and at the same time, the multiple flange disc teeth of the flange plate of the drying cabin body can be correspondingly embedded in the multiple second notches of the hatch flange; the hatch is driven to rotate by the motor of the hatch drive mechanism, and the multiple flange teeth of the hatch flange can be correspondingly embedded in the grooves between the flange disc teeth and the joint surface of the flange disc body.

[0009] On the basis of the above technical solution, the utility model can also be improved as follows:

[0010] As a further improvement of the above technical solution, the air pipe is provided with an air intake valve and an exhaust branch pipe, and the exhaust branch pipe is provided with an exhaust valve.

[0011] As a further improvement of the above technical solution, the air inlet valve and the air exhaust valve are electrically controlled valves, and the compressed air source is a tank containing compressed air.

[0012] As a further improvement of the above technical solution, the door driving mechanism also includes a hydraulic station, the hydraulic cylinder is installed in the cabinet and connected to the hydraulic station through a pipeline, and the other end of the first connecting arm is connected to the outer wall of the opening end of the drying cabin body by welding.

[0013] As a further improvement of the above technical solution, the above vacuum freeze dryer also includes a control box installed on the cabinet, and a PLC controller is provided in the control box. The PLC controller is electrically connected to the air pump, air inlet valve, exhaust valve, hydraulic station and motor.

[0014] As a further improvement of the above technical solution, the annular groove is located on the inner side of the plurality of flange disc teeth along the circumferential direction, the cross section of the sealing ring is U-shaped, and the cross section of the airway is L-shaped.

[0015] As a further improvement of the above technical solution, the sealing ring is made of rubber.

[0016] The beneficial effect of the utility model is as follows: compared with the manual opening and closing of the chamber door of the traditional freeze dryer, the vacuum freeze dryer of the utility model arranges a chamber door driving mechanism between the drying chamber body and the chamber door of the freeze drying chamber, and arranges a flange plate and a flange on the drying chamber body and the chamber door respectively, and arranges a sealing ring between the flange plate and the flange and an airway, an air pump and a compressed air source connected to the sealing ring. By injecting compressed air into the flange plate, the sealing ring is subjected to a large compressed gas pressure to expand and fit tightly to the flange plate and the flange, thereby realizing automatic opening and closing of the chamber door and automatic sealing of the freeze drying chamber, thereby solving the problem of easy contamination during the freeze drying of materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0018] Figure 1 It is a structural schematic diagram of a vacuum freeze dryer provided in a preferred embodiment of the utility model;

[0019] Figure 2 yes Figure 1 A schematic diagram of the partial inner side of the vacuum freeze dryer;

[0020] Figure 3 yes Figure 1 A top view of the vacuum freeze dryer in FIG. 1 , wherein the cover is in a closed state;

[0021] Figure 4 yes Figure 1 A top view of the vacuum freeze dryer in FIG. 1 , wherein the cover is in an open state;

[0022] Figure 5 is a partial cross-sectional view of the engagement between the flange disc and the flange;

[0023] Figure 6 yes Figure 5 A partial exploded view of the middle flange disc and flange;

[0024] Figure 7 yes Figure 1 A schematic diagram of the structure of the middle door driving mechanism;

[0025] In the figure: 10, cabinet; 20, drying cabin body; 21, flange plate; 211, flange plate body; 212, flange plate teeth; 213, first notch; 214, slot; 215, joint surface; 216, groove; 217, airway; 22, sealing ring; 221, sealing groove; 30, cabin door; 31, flange; 311, flange body; 312, flange teeth; 313, second notch; 40, cabin door Driving mechanism; 41. Driving arm; 42. First connecting arm; 43. Second connecting arm; 44. Hydraulic cylinder; 45. First articulated shaft; 46. Second articulated shaft; 47. Motor; 48. Hydraulic station; 51. Air pipe; 52. Air pump; 53. Compressed air source; 54. Inlet valve; 55. Exhaust branch pipe; 56. Exhaust valve; 60. Control box; 71. Heating plate; 72. Condensing coil; 73. Vacuum pump. DETAILED DESCRIPTION

[0026] The present invention will now be further described in detail in conjunction with the accompanying drawings and embodiments. These drawings are simplified schematic diagrams that only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0027] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present 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 present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0029] like Figures 1 to 7As shown, a vacuum freeze dryer provided by a preferred embodiment of the utility model includes a cabinet 10 and a freeze drying chamber installed on the cabinet 10, and the freeze drying chamber includes a drying chamber body 20, a chamber door 30 and a chamber door driving mechanism 40 arranged between the drying chamber body 20 and the chamber door 30.

[0030] A placement plate, a heating plate 71 and a condensing coil 72 are provided inside the freeze drying chamber, and a vacuum pump 73, a refrigeration compressor unit, a circulation pump, a heating tank and other equipment are arranged outside the freeze drying chamber. The structure and working principle of the freeze-dried material of the vacuum freeze dryer are prior art (refer to the existing patent with patent number CN219934429U), which will not be repeated here.

[0031] The drying cabin body 20 is cylindrical, and most of the drying cabin body 20 is arranged inside the cabinet 10, and only one end of the drying cabin body 20 is arranged outside the cabinet 10. The one end of the drying cabin body 20 is an open end with an opening, and the outer edge of the open end of the drying cabin body 20 is provided with a flange plate 21, and the flange plate 21 includes an annular flange plate body 211 and a plurality of flange plate teeth 212 extending from the outer edge of the flange plate body 211 and bent inwardly, and the plurality of flange plate teeth 212 are equidistantly spaced from each other along the circumferential direction, so that a first notch 213 is formed between two adjacent flange plate teeth 212. The flange plate body 211 has a joint surface 215 for jointing with the cabin door 30, and a clamping groove 214 is formed between the joint surface 215 of the flange plate body 211 and the flange plate teeth 212.

[0032] The joint surface 215 of the flange body 211 is provided with an annular groove 216, which is located on the inner side of the plurality of flange teeth 212 along the circumferential direction, and a sealing ring 22 is provided in the annular groove 216. The material of the sealing ring 22 can be rubber, and the cross section of the sealing ring 22 is U-shaped, and an annular sealing groove 221 is provided on the inner side of the sealing ring 22; the flange body 211 is provided with an air passage 217 with an L-shaped cross section, and the air passage 217 has an air inlet end and an air outlet end connected with the annular groove 216 and the sealing groove 221 of the sealing ring 22, and the air inlet end of the air passage 217 is connected with the air outlet end of the annular groove 216 and the sealing groove 221 of the sealing ring 22. The pipe 51 is connected to the air pump 52 and the compressed air source 53, and the air pipe 51 is provided with an air inlet valve 54; in addition, the air pipe 51 is also connected to the exhaust branch pipe 55, and the exhaust branch pipe 55 is provided with an exhaust valve 56. The air inlet valve 54 and the exhaust valve 56 can be electrically controlled valves. The compressed air source 53 is used to provide compressed air, and the compressed air source 53 can be a tank containing compressed air. The air pump 52 is connected to the airway 217 through the air pipe 51, and is used to draw the compressed air along the airway 217 into the annular groove 216 or discharge the compressed air in the annular groove 216. When the compressed air is drawn into the annular groove 216, the air inlet valve 54 is opened and the exhaust valve 56 is closed; when the compressed air in the annular groove 216 is discharged, the air inlet valve 54 is closed and the exhaust valve 56 is opened.

[0033] The hatch 30 is circular and is arranged at the open end of the drying cabin body 20. A flange 31 is provided on the outer edge of the hatch 30. The flange 31 includes an annular flange body 311 and a plurality of flange teeth 312 extending radially outward from the outer edge of the flange body 311. The plurality of flange teeth 312 are equidistantly spaced from each other, so that a second notch 313 is formed between two adjacent flange teeth 312.

[0034] The hatch drive mechanism 40 is used to open and close the hatch 30, and includes a driving arm 41, a first connecting arm 42, a second connecting arm 43, a hydraulic cylinder 44, a hydraulic station 48 and a motor 47. The hydraulic cylinder 44 is installed in the cabinet 10 and is connected to the hydraulic station 48 through a pipeline. The hydraulic station 48 is a prior art and includes components such as a hydraulic oil pipe, a control valve, a hydraulic pump, and an oil tank. A piston rod is provided at one end of the hydraulic cylinder 44, and the motor 47 is fixed to one end of the driving arm 41 by screws. The output shaft of the motor 47 passes through the driving arm 41 and is fixedly connected to the center of the hatch 30. The other end of the driving arm 41 is connected to one end of the second connecting arm 43 by welding. One end of the second connecting arm 43 is connected to one end of the first connecting arm 42 by a first hinge shaft 45, and the other end of the second connecting arm 43 is connected to the piston rod of the hydraulic cylinder 44 by a second hinge shaft 46. The first connecting arm 42 is tilted, and the other end of the first connecting arm 42 is connected to the outer wall of the opening end of the drying cabin body 20 by welding. The hydraulic cylinder 44 drives the second connecting arm 43 to rotate around the first hinge shaft 45 to drive the driving arm 41 to move closer to or away from the drying chamber body 20, thereby opening and closing the chamber door 30.

[0035] Furthermore, the above-mentioned vacuum freeze dryer also includes a control box 60 installed on the cabinet 10, and a PLC controller is provided in the control box 60. The PLC controller is electrically connected to the air pump 52, the air inlet valve 54, the exhaust valve 56, the hydraulic station 48 and the motor 47, so that the flow direction of the compressed air and the working status of the hydraulic cylinder 44 and the motor 47 can be controlled through the PLC controller.

[0036] When the utility model is used, the hydraulic cylinder 44 of the door driving mechanism 40 is controlled by the control box 60 to move, and the hydraulic cylinder 44 drives the second connecting arm 43 to rotate around the first hinge shaft 45 to drive the driving arm 41 to move away from the drying chamber body 20, so as to open the door 30 and put the material to be freeze-dried into the freeze-drying chamber; then the hydraulic cylinder 44 of the door driving mechanism 40 is controlled by the control box 60 to move, and the hydraulic cylinder 44 drives the second connecting arm 43 to rotate around the first hinge shaft 45 to drive the driving arm 41 to move close to the drying chamber body 20, so that the flange 31 of the door 30 is opened. The multiple flange teeth 312 of the drying chamber body 20 are correspondingly embedded in the multiple first notches 213 of the flange plate 21, and the multiple flange plate teeth 212 of the flange plate 21 of the drying chamber body 20 are correspondingly embedded in the multiple second notches 313 of the flange 31 of the cabin door 30; then the control box 60 controls the motor 47 of the cabin door driving mechanism 40 to drive the cabin door 30 to rotate a certain angle, so that the multiple flange teeth 312 of the flange 31 of the cabin door 30 are correspondingly embedded in the groove 214 between the flange plate teeth 212 and the joint surface 215 of the flange plate body 211, and the cabin door 30 is in a closed state (such as Figure 3 As shown in the figure, at this time, the flange 31 of the door 30 is in contact with the joint surface 215 of the flange disc body 211 of the drying chamber body 20 and the sealing ring 22; then, the control box 60 controls the air intake valve 54 to open and the air pump 52 to start, and the compressed air enters the sealing groove 221 of the sealing ring 22 along the air passage 217 and squeezes the sealing ring 22, so that the sealing ring 22 expands and tightly fits the inner wall of the groove 216 of the flange disc body 211 and the flange 31, and the outer surface of the multiple flange teeth 312 corresponds to the inner surface of the multiple flange disc teeth 212 and tightly fits, and then the control box 60 controls the air intake valve 54 to close, so that the door 30 is sealed and joined to the drying chamber body 20.

[0037] After the material in the freeze-drying chamber is completely freeze-dried, the exhaust valve 56 is controlled by the control box 60 to open and the air inlet valve 54 is closed, and the compressed air in the groove 216 is discharged along the exhaust branch pipe 55. At this time, the sealing ring 22 is no longer tightly fitted to the inner wall of the groove 216 and the flange 31 of the flange disk body 211; then the motor 47 of the door drive mechanism 40 is controlled by the control box 60 to rotate the door 30 in the opposite direction, so that the multiple flange teeth 312 of the flange 31 of the door 30 rotate and enter the multiple first notches 213 of the flange disk 21 of the drying chamber body 20, and at the same time, the multiple flange disk teeth 212 of the flange disk 21 of the drying chamber body 20 rotate and enter the multiple second notches 313 of the flange 31 of the door 30; finally, the hydraulic cylinder 44 of the door drive mechanism 40 is controlled by the control box 60 to open the door 30, and the freeze-dried material is taken out of the freeze-drying chamber.

[0038] Compared with the manual opening and closing of the chamber door of the traditional freeze dryer, the above-mentioned vacuum freeze dryer of the utility model arranges a chamber door driving mechanism 40 between the drying chamber body 20 and the chamber door 30 of the freeze drying chamber, and arranges a flange plate 21 and a flange 31 on the drying chamber body 20 and the chamber door 30 respectively, and arranges a sealing ring 22 between the flange plate 21 and the flange 31 and an airway 217, an air pump 52 and a compressed air source 53 connected to the sealing ring 22. By injecting compressed air into the flange plate 21, the sealing ring 22 is subjected to a large compressed gas pressure to expand and fit tightly to the flange plate 21 and the flange 31, thereby realizing automatic opening and closing of the chamber door 30 and automatic sealing of the freeze drying chamber, thereby solving the problem of easy contamination during the freeze drying of materials.

[0039] Any details not mentioned in the above specific embodiments of the present invention belong to the known technologies in the art and can be implemented with reference to the known technologies.

[0040] The above is based on the ideal embodiment of the utility model. Through the above description, relevant personnel can make various changes and modifications without deviating from the technical concept of the utility model. The technical scope of this utility model is not limited to the content in the specification, and the technical scope must be determined according to the scope of the claims.

Claims

1. A vacuum freeze dryer, comprising a cabinet and a freeze drying chamber installed on the cabinet, characterized in that: The freeze drying chamber comprises a drying chamber body, a chamber door and a chamber door driving mechanism arranged between the drying chamber body and the chamber door, wherein one end of the drying chamber body is an open end, and a flange plate is arranged at the outer edge of the open end of the drying chamber body, and the flange plate comprises an annular flange plate body and a plurality of flange plate teeth extending from the outer edge of the flange plate body and bent inwardly, and the plurality of flange plate teeth are equidistantly spaced from each other along the circumferential direction, so as to form a first notch between two adjacent flange plate teeth; the flange plate body has a joint surface for jointing with the chamber door, and a clamping groove is formed between the joint surface of the flange plate body and the flange plate teeth; The joint surface of the flange body is provided with an annular groove, a sealing ring is provided in the annular groove, and an annular sealing groove is provided inside the sealing ring; the flange body is provided with an air passage, the air passage has an air inlet end and an air outlet end connected with the annular groove and the sealing groove of the sealing ring, and the air inlet end of the air passage is connected with an air pump and a compressed air source through an air pipe; The hatch is arranged at the opening end of the drying cabin body, and a flange is arranged on the outer edge of the hatch, wherein the flange comprises an annular flange body and a plurality of flange teeth extending radially outward from the outer edge of the flange body, wherein the plurality of flange teeth are equidistantly spaced from each other, and a second notch is formed between two adjacent flange teeth; The hatch drive mechanism is used to open and close the hatch, and includes a drive arm, a first connecting arm, a second connecting arm, a hydraulic cylinder and a motor. A piston rod is provided at one end of the hydraulic cylinder. The motor is fixedly mounted at one end of the drive arm. The output shaft of the motor is connected to the center of the hatch. The other end of the drive arm is connected to one end of the second connecting arm. One end of the second connecting arm is connected to one end of the first connecting arm through a first hinge shaft. The other end of the second connecting arm is connected to the hydraulic cylinder through a second hinge shaft. The other end of the first connecting arm is connected to the drying cabin body. The hydraulic cylinder drives the second connecting arm to rotate around the first hinge shaft to drive the drive arm to move closer to or away from the drying cabin body, thereby opening and closing the hatch. The multiple flange teeth of the hatch flange can be correspondingly embedded in the multiple first notches of the flange plate of the drying cabin body, and at the same time, the multiple flange disc teeth of the flange plate of the drying cabin body can be correspondingly embedded in the multiple second notches of the hatch flange; the hatch is driven to rotate by the motor of the hatch drive mechanism, and the multiple flange teeth of the hatch flange can be correspondingly embedded in the grooves between the flange disc teeth and the joint surface of the flange disc body.

2. The vacuum freeze dryer according to claim 1, characterized in that: The air pipe is provided with an air inlet valve and an exhaust branch pipe, and the exhaust branch pipe is provided with an exhaust valve.

3. The vacuum freeze dryer according to claim 2, characterized in that: The air inlet valve and the air exhaust valve are electrically controlled valves, and the compressed air source is a tank containing compressed air.

4. The vacuum freeze dryer according to claim 3, characterized in that: The door driving mechanism also includes a hydraulic station, the hydraulic cylinder is installed in the cabinet and connected to the hydraulic station through a pipeline, and the other end of the first connecting arm is connected to the outer wall of the opening end of the drying cabin body by welding.

5. The vacuum freeze dryer according to claim 4, characterized in that: It also includes a control box installed on the cabinet, in which a PLC controller is arranged, and the PLC controller is electrically connected to the air pump, the air inlet valve, the exhaust valve, the hydraulic station and the motor.

6. The vacuum freeze dryer according to claim 1, characterized in that: The annular groove is located on the inner side of the plurality of flange disc teeth along the circumferential direction, the cross section of the sealing ring is U-shaped, and the cross section of the air passage is L-shaped.

7. The vacuum freeze dryer according to claim 1, characterized in that: The sealing ring is made of rubber.

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