A special air conditioning device for high-sealing granary in a controlled atmosphere warehouse

Abstract

The present invention provides a special air conditioning device for a gas-controlled warehouse with high sealing performance for a granary. The vortex compressor is connected with a finned condenser, a liquid storage tank, a filter dryer, a sight glass, a stop valve, a solenoid valve, a thermal expansion valve, and an air handling mechanism in sequence through a No. 1 connecting pipe; the air handling mechanism includes a shell and a finned evaporator, a finned supercooler, an ultrasonic humidifier, and an axial flow centrifugal blower arranged in the shell in sequence. One end of the shell is provided with an air outlet corresponding to the air outlet of the axial flow centrifugal blower, and the other end of the shell is provided with an air inlet, and a temperature and humidity sensor is provided at the air inlet. The present invention has a simple structure and complete functions, and the whole machine has high sealing performance. At the same time, according to the characteristics of the gas-controlled warehouse, the unit adopts PLC programmable control for the refrigeration of nitrogen, and can be connected to a grain condition monitoring system. The unit control has a mobile phone APP function, which can conveniently control the start and stop of the unit on a mobile phone and monitor the operation status of the unit.

Description

Technical Field

[0001] The invention belongs to the technical field of grain air conditioning, and in particular relates to a special air conditioning device for a grain silo with high sealing performance, which is specially used in a gas conditioning warehouse. Background Art

[0002] At present, low-temperature storage of grain has become a trend. Low-temperature storage is beneficial to improving grain quality, preventing pests, and reducing storage losses. In order to better reduce the loss and mildew of stored grain caused by grain respiration, and to further inhibit and eliminate pests, nitrogen with a concentration of more than 98% is flushed into the granary for grain storage, using the inertness and suffocation of nitrogen to kill pests and delay grain aging.

[0003] The air conditioning warehouse has very high requirements for the sealing of the warehouse body and equipment. Generally, the unit, including the return air duct, should adopt a sealing design of 500pa pressure and a drop of no more than 50pa in 15 minutes. In order to achieve the sealing effect, the current units generally adopt the form of applying sealant between the frame and the door panel, but the sealing effect is not ideal, and the unit cannot be disassembled for maintenance. Once disassembled, it will be difficult to achieve the previous sealing effect.

[0004] The existing air conditioning system in the gas storage is still calculated and designed according to the traditional air medium, but more than 98% of the gas in the gas storage is nitrogen, and the thermodynamic properties of nitrogen are quite different from those of air, so the previous design cannot be simply copied. At the same time, the control of the grain air conditioning unit is relatively backward, and can only be controlled by a single unit, without networking, and it is impossible to remotely know the temperature in the granary in a timely manner. Summary of the invention

[0005] In view of the above-mentioned technical deficiencies, the purpose of the present invention is to provide a special air-conditioning device for a controlled atmosphere warehouse with high sealing performance for a granary. The device has a simple structure and complete functions. While keeping the grain at a low temperature, it ensures the high air tightness of the granary. It can ensure that the pressure drop of the unit and the supporting air duct is no more than 50 Pa in 15 minutes under a pressure of 500 Pa, thus solving the problem of refrigeration of nitrogen with a concentration of more than 98% in a controlled atmosphere warehouse.

[0006] In order to achieve the above object, the technical solution of the present invention is as follows:

[0007] A highly sealed granary air conditioning device for a gas conditioning warehouse comprises a refrigeration assembly; the refrigeration assembly comprises: a scroll compressor, a finned condenser, a liquid storage tank, a dry filter, a liquid sight glass, a stop valve, a No. 1 solenoid valve, a thermal expansion valve, an air handling mechanism, and a control device; the scroll compressor is sequentially connected with the finned condenser, the liquid storage tank, the dry filter, the liquid sight glass, the stop valve, the No. 1 solenoid valve, the thermal expansion valve, and the air handling mechanism through a No. 1 connecting pipe;

[0008] The air handling mechanism includes a shell and a finned evaporator, a finned subcooler, an ultrasonic humidifier, and an axial-flow centrifugal blower which are sequentially arranged in the shell. One end of the shell is provided with an air outlet corresponding to the air outlet of the axial-flow centrifugal blower, and the other end of the shell is provided with an air inlet. A temperature and humidity sensor is provided at the air inlet. The finned evaporator is connected to the scroll compressor through a No. 2 connecting pipe, a No. 3 connecting pipe connected to the finned subcooler is provided on the No. 1 connecting pipe between the No. 1 solenoid valve and the stop valve, a No. 2 solenoid valve is provided on the No. 3 connecting pipe, and a No. 4 connecting pipe connected to the finned subcooler is provided on the No. 1 connecting pipe between the No. 1 solenoid valve and the thermal expansion valve.

[0009] Furthermore, one end of the finned condenser is connected to an axial flow fan.

[0010] Furthermore, the scroll compressor, the finned condenser, the No. 1 solenoid valve, the No. 2 solenoid valve, the thermal expansion valve, the temperature and humidity sensor, the finned evaporator, the finned subcooler, the ultrasonic humidifier, and the axial flow centrifugal blower are all electrically connected to the PLC controller.

[0011] Furthermore, the refrigeration component uses nitrogen with a concentration of more than 98%.

[0012] Furthermore, the cooling capacity of the compressor can be increased, the air volume of the blower can be reduced, the heat exchange area of ​​the evaporator can be reduced, and the heat exchange area of ​​the condenser can be increased to ensure the balanced operation of the entire unit.

[0013] Furthermore, the PLC controller adopts PLC programmable control, which can set and display the operating parameters of the unit, while taking into account the extreme operating conditions of the unit, and has automatic fault diagnosis and fault handling assistance functions. At the same time, the unit has a standard 485 interface, which can be connected to the host computer and has remote control and networking functions.

[0014] Furthermore, a mobile phone APP function is added to the unit control system. One module can control 10 units at the same time, making it convenient to operate the units on a mobile phone.

[0015] Furthermore, it also includes a sealing component arranged between the unit door panel and the frame, the sealing component includes a hollow π-shaped sealing strip and an O-shaped sealing ring, the frame profile is provided with a groove for placing the unit door panel, a plurality of hollow π-shaped sealing strips are inlaid in a groove, and a plurality of high-strength direct-foamed O-shaped sealing rings are provided on the other opposite right-angle surface.

[0016] Beneficial effects: The structure is simple and the functions are complete. The whole machine has a high sealing performance. At the same time, according to the characteristics of the gas conditioning storage, the refrigeration of nitrogen is specially developed:

[0017] (1) Compared with traditional air, the high-sealing granary air conditioning device for the gas conditioning warehouse of the present invention uses nitrogen with a concentration of more than 98% as the refrigerant medium, which can ensure the nitrogen cooling of the gas conditioning warehouse;

[0018] (2) The air conditioning device for high-sealing granary in the gas conditioning storage of the present invention adopts PLC control and has a mobile phone APP function. It can be connected to the grain condition detection system, and the unit can be started and stopped on the mobile phone to monitor the operation status of the unit;

[0019] (3) Compared with the traditional sealing method of applying sealant, a labyrinth-type multi-structure seal is used between the frame and the door panel of the unit, which can ensure the airtightness of the unit and the sealing effect will not be destroyed after multiple disassembly and assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 A structural schematic diagram of a highly sealed granary air conditioning device for a controlled atmosphere storage provided by an embodiment of the present invention;

[0022] Figure 2 This is a diagram of the labyrinth seal structure of the frame door panel of the present invention.

[0023] Description of reference numerals:

[0024] 1-Scroll compressor, 2-Fin condenser, 3-Liquid storage tank, 4-Drying filter, 5-Sight glass, 6-Stop valve, 7-No. 1 solenoid valve, 8-Thermal expansion valve, 9-Shell, 10-Temperature and humidity sensor, 11-Fin evaporator, 12-Fin subcooler, 13-Ultrasonic humidifier, 14-Axial flow centrifugal blower, 15-Air inlet, 16-Air outlet, 17-Control box, 18-Axial flow fan, 19-No. 2 solenoid valve, 20-No. 1 connecting pipe, 21-No. 3 connecting pipe, 22-No. 4 connecting pipe, 23-No. 2 connecting pipe, 24-Pressure controller, 25-Unit door panel, 26-Profile notch, 27-Metal insert, 28-Hollow π-type sealing strip, 29-O-ring. DETAILED DESCRIPTION

[0025] The present invention is described below with reference to specific examples. It will be appreciated by those skilled in the art that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention in any way.

[0026] like Figure 1 As shown, a highly sealed granary air conditioning device for a controlled atmosphere warehouse includes a refrigeration component;

[0027] The refrigeration assembly includes: a scroll compressor 1, a finned condenser 2, a liquid storage tank 3, a drying filter 4, a sight glass 5, a stop valve 6, a No. 1 solenoid valve 7, a thermal expansion valve 8, an air handling mechanism, and a control device. The scroll compressor 1 is connected to the finned condenser 2, the liquid storage tank 3, the drying filter 4, the sight glass 5, the stop valve 6, the No. 1 solenoid valve 7, the thermal expansion valve 8, and the air handling mechanism in sequence through a No. 1 connecting pipe 20; an axial flow fan 18 is connected to one end of the finned condenser 2;

[0028] The air handling mechanism includes a shell 9 and a finned evaporator 11, a finned subcooler 12, an ultrasonic humidifier 13, and an axial flow centrifugal blower 14 which are sequentially arranged in the shell 9. An air outlet 16 corresponding to the air outlet of the axial flow centrifugal blower 14 is provided at one end of the shell 9, and an air inlet 15 is provided at the other end of the shell 9. A temperature and humidity sensor 10 is provided at the air inlet 15. The finned evaporator 11 is connected to the scroll compressor 1 through a No. 2 connecting pipe 23. A No. 3 connecting pipe 21 connected to the finned subcooler 12 is provided on the No. 1 connecting pipe 20 between the No. 1 solenoid valve 7 and the stop valve 6. A No. 2 solenoid valve 19 is provided on the No. 3 connecting pipe 21. A No. 4 connecting pipe 22 connected to the finned subcooler 12 is provided on the No. 1 connecting pipe 20 between the No. 1 solenoid valve 7 and the thermal expansion valve 8.

[0029] The control device includes a control box 17 and a PLC controller installed in the control box 17. The scroll compressor 1, the finned condenser 2, the No. 1 solenoid valve 7, the No. 2 solenoid valve 19, the thermal expansion valve 8, the temperature and humidity sensor 10, the finned evaporator 11, the finned subcooler 12, the ultrasonic humidifier 13, and the axial flow centrifugal blower 14 are all electrically connected to the PLC controller.

[0030] Preferably, the refrigeration component uses nitrogen with a concentration of more than 98%. Specifically, the main physical properties of air and nitrogen are shown in Table 1 and Table 2:

[0031] Table 1 The main physical properties of air are as follows:

[0032]

[0033] Table 2 The main physical properties of nitrogen are as follows:

[0034]

[0035] From the above two tables, we can see that at 21℃, the density of nitrogen is 1.205-1.160 / 1.205=4% lighter than air, and the specific heat capacity at 25℃ is 1.038-1.005 / 1.005=3.3%. The thermal properties of wet nitrogen and wet air are also quite different. In view of the above problems, when designing the unit, we can increase the cooling capacity of the compressor, reduce the air volume of the blower, reduce the heat exchange area of ​​the evaporator, and increase the heat exchange area of ​​the condenser to ensure the operation balance of the entire unit.

[0036] Preferably, the PLC controller in the control box 17 adopts PLC programmable control, can set and display the operating parameters of the unit, and considers the extreme operating conditions of the unit operation, has automatic fault diagnosis and fault handling help functions, and the unit has a standard 485 interface, can be connected to the host computer, and has remote control and networking functions. A mobile phone APP function is added to the unit control system, and one module can control 10 units at the same time, which is convenient for controlling the unit on the mobile phone.

[0037] Figure 2 The diagram is a labyrinth seal structure of the frame door panel. It also includes a sealing component arranged between the unit door panel 25 and the frame, which includes a hollow π-shaped sealing strip 28 and an O-shaped sealing ring 29. The end of a unit door panel 25 is located in a groove on the frame profile. The groove is composed of a limiting plate on the inner side, a profile notch 26 on the outer side, and a metal insert 27. Two hollow π-shaped sealing strips 28 are embedded in the inner side of the limiting plate and contact the side wall of the unit door panel 25; two O-shaped sealing rings 29 are formed by high-strength direct foaming, located at the bottom of the groove and contacting the end face of the unit door panel 25; the other side wall of the frame is simultaneously structured and sealed with the unit door panel 25; at the same time, the hollow cavity inside the profile is provided with an insulation layer, and the unit door panel 25 is insulated with foaming material; through double-sided four-way sealing, the high air tightness of the unit is ensured. The door panel and the frame of the unit are installed with special-shaped sealing strips, which have good sealing effect and are easy to disassemble. At the same time, there is no screw connection, which further reduces the leakage rate.

[0038] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A highly sealed air conditioning device for a granary specially used in a controlled atmosphere warehouse, characterized in that: It includes a refrigeration assembly; the refrigeration assembly includes: a scroll compressor, a finned condenser, a liquid storage tank, a drying filter, a liquid mirror, a stop valve, a No. 1 solenoid valve, a thermal expansion valve, an air handling mechanism, and a control device. The scroll compressor is connected with the finned condenser, the liquid storage tank, the drying filter, the liquid mirror, the stop valve, the No. 1 solenoid valve, the thermal expansion valve, and the air handling mechanism in sequence through a No. 1 connecting pipe; the refrigeration assembly uses nitrogen with a concentration of more than 98%; The air handling mechanism includes a shell and a finned evaporator, a finned subcooler, an ultrasonic humidifier, and an axial flow centrifugal blower which are sequentially arranged in the shell. An air outlet corresponding to the air outlet of the axial flow centrifugal blower is provided at one end of the shell, and an air inlet is provided at the other end of the shell. A temperature and humidity sensor is provided at the air inlet. The finned evaporator is connected to the scroll compressor through a No. 2 connecting pipe. A No. 3 connecting pipe connected to the finned subcooler is provided on the No. 1 connecting pipe between the No. 1 solenoid valve and the stop valve. A No. 2 solenoid valve is provided on the No. 3 connecting pipe. A No. 4 connecting pipe connected to the finned subcooler is provided on the No. 1 connecting pipe between the No. 1 solenoid valve and the thermal expansion valve. The control device includes a control box and a PLC controller arranged in the control box.

2. The highly sealed granary air conditioning device for a controlled atmosphere storage as claimed in claim 1, characterized in that: One end of the fin type condenser is connected to an axial flow fan.

3. The highly sealed granary air conditioning device for a controlled atmosphere storage as claimed in claim 1, characterized in that: The scroll compressor, the finned condenser, the No. 1 solenoid valve, the No. 2 solenoid valve, the thermal expansion valve, the temperature and humidity sensor, the finned evaporator, the finned subcooler, the ultrasonic humidifier, and the axial flow centrifugal blower are all electrically connected to the PLC controller.

4. The highly sealed granary air conditioning device for a controlled atmosphere storage as claimed in claim 1, characterized in that: The PLC controller adopts PLC programmable control, which can set and display the operating parameters of the unit, and at the same time take into account the extreme operating conditions of the unit, and has automatic fault diagnosis and fault handling assistance functions. At the same time, the unit has a standard 485 interface, which can be connected to the host computer and has remote control and networking functions.

5. The highly sealed air conditioning device for granaries dedicated to a controlled atmosphere storage as claimed in claim 1, characterized in that: It also includes an external unit control system, which has an additional mobile phone APP function. One module can control 10 units at the same time, making it convenient to control the units on a mobile phone.

6. The highly sealed granary air conditioning device for a controlled atmosphere storage as claimed in claim 1, characterized in that: It also includes a sealing component arranged between the unit door panel and the frame, the sealing component includes a hollow π-shaped sealing strip and an O-shaped sealing ring, a groove for placing the unit door panel is provided on the profile of the frame, a plurality of hollow π-shaped sealing strips are inlaid in one groove, and a plurality of high-strength direct-foamed O-shaped sealing rings are provided on the other opposite right-angle surface.

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