A special cooling device for reheating grain pile

Abstract

The present invention provides a special cooling device for a reheated grain pile, including a refrigerant circulation system and an air reheating system; the refrigerant circulation system mainly includes a compressor, a finned condenser, and a finned evaporator; the reheated air system mainly includes a compressor, an electric three-way regulating valve, a liquid reservoir, a reheated condenser, a humidity controller, and a refrigerant pipeline; the left end of the compressor is connected to the top of the finned condenser; an axial flow fan is fixed vertically above the finned condenser to accelerate exhaust; the bottom end of the finned condenser is connected to the top of the liquid reservoir; the upper right end of the liquid reservoir is connected to one end of a parallel group of an electromagnetic valve and a thermal expansion valve; the other end of the parallel group of the electromagnetic valve and the thermal expansion valve is connected to a finned evaporator; the finned evaporator is connected to one end of a screw compressor to form a refrigeration circulation system. The present invention improves the condensation effect by using a finned condenser and increasing the contact area.

Description

Technical Field

[0001] The invention belongs to the field of grain storage systems, and in particular relates to a reheating type grain pile special cooling device. Background Art

[0002] The grain pile cooling device refers to a refrigeration unit that sends cold air into the grain pile through the ground cage. The cold air is discharged from the grain pile through the gaps between the grains, taking away the heat inside the grain pile, thereby reducing the temperature of the grain pile, ensuring that the grain can be stored for a long time without mildew, and ensuring the quality of the grain. The air that passes through the grain pile returns to the refrigeration unit through the return air duct, completing a cycle.

[0003] The existing grain pile-specific cooling device has a low air outlet temperature and a high relative humidity of the supplied air, which easily forms condensation inside the grain pile, causing the grain pile to become moldy due to excessive water content, thus affecting the grain quality.

[0004] In order to solve the above problems, the traditional approach is to install electric heating behind the evaporator to increase the air temperature and reduce the relative humidity of the outlet air. Due to the large power of electric heating, the power load of the equipment increases, the operating cost increases, and thus affects user use. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a reheating type grain pile special cooling device, which has the characteristics of compact structure, energy-saving operation, stable and reliable, arbitrary humidity adjustment, and guaranteed grain quality.

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

[0007] A reheating grain pile special cooling device comprises a refrigerant circulation system and an air reheating system;

[0008] The refrigerant circulation system mainly includes a compressor, a finned condenser and a finned evaporator. A pressure sensor and a temperature sensor are connected to the top of the compressor; the left end of the compressor is connected to the top of the finned condenser;

[0009] An axial flow fan is fixed vertically above the finned condenser to speed up air exhaust;

[0010] The bottom end of the finned condenser is connected to the top end of the liquid reservoir; the upper right end of the liquid reservoir is connected to one end of the parallel group of the electromagnetic valve and the thermal expansion valve; the other end of the parallel group of the electromagnetic valve and the thermal expansion valve is connected to the finned evaporator; the finned evaporator is connected to one end of the screw compressor to form a refrigeration cycle system;

[0011] The air reheat system mainly includes a compressor, an electric three-way regulating valve, a liquid receiver, a reheat condenser, a humidity controller and a refrigerant pipeline; the lower end of the compressor is connected to the top end of the electric three-way regulating valve, the right end of the electric three-way regulating valve is connected to the left end of the reheat condenser through a pipeline, and the right end of the reheat condenser is connected to the top end of the liquid receiver; the upper right end of the liquid receiver is connected to one end of the parallel group of the solenoid valve and the thermal expansion valve, and the other end of the parallel group of the solenoid valve and the thermal expansion valve is connected to the finned evaporator; the finned evaporator is connected to one end of the screw compressor to form an air reheat cycle.

[0012] Furthermore, the refrigerant cycle system and the air reheat cycle are both operated by a programmable logic controller (PLC) control device; the programmable logic controller (PLC) is connected to a humidity sensor and an electric three-way regulating valve; it monitors the humidity of the outlet air, and realizes automatic control of the electric three-way regulating valve through calculation by the programmable logic controller (PLC).

[0013] Furthermore, a motor is fixed at the right end of the reheat condenser; the motor is connected and fixed to the centrifugal blower through a transmission belt; the right end of the centrifugal blower is connected to the air outlet; and a humidity sensor is provided at the air outlet.

[0014] Furthermore, a return air port is connected to the left end of the fin-type evaporator; a temperature controller is provided at the return air port, and a water retainer is used to separate the expansion valve and the reheat condenser; a second stop valve is provided on the pipeline connecting one end of the reheat condenser to the liquid reservoir; and a first stop valve is provided on the pipeline connecting the other end of the reheat condenser to the fin-type condenser.

[0015] Furthermore, a finned condenser reheating system is added to the refrigerant circulation system, which increases the temperature of the air after passing through the evaporator and reduces the relative humidity of the outlet air, thereby preventing the air humidity blown into the grain pile from being too high, causing condensation on the grain and causing the grain to become moldy.

[0016] Furthermore, the refrigerant circulation system uses environmentally friendly refrigerant R134A.

[0017] Beneficial effects: The present invention integrates the refrigerant circulation system and the condenser reheat system, and adjusts the refrigerant flow entering the reheat condenser through the refrigerant three-way flow regulating valve, thereby further adjusting the heating amount of the reheat condenser to ensure the relative humidity of the outlet air. This technology does not require additional energy consumption, but can improve the operating efficiency of the unit. It has a compact structure, convenient adjustment, energy-saving operation, and is stable and reliable. It can greatly reduce the energy consumption of the refrigeration device, ensure the user's use effect, and prevent the mildew of grain during operation. Using condensation heat to heat the air does not require additional energy consumption, improves the efficiency of the unit, reduces the power consumption of the unit, and ensures the country's grain storage safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the refrigeration unit operation system;

[0019] Figure 2 It is a schematic diagram of the structure of the present invention.

[0020] In the figure, 1-drying filter, 2-solenoid valve, 3-first stop valve, 4-second stop valve, 5-compressor, 6-electric three-way regulating valve, 7-liquid reservoir, 8-finned condenser, 9-axial flow fan, 10-programmable control box, 11-temperature controller, 12-finned evaporator, 13-expansion valve, 14-water retainer, 15-reheat condenser, 16-motor, 17-centrifugal blower, 18-humidity sensor, 19-grain cooler, 20-plate filter, 21-evaporator, 22-heater. DETAILED DESCRIPTION

[0021] 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.

[0022] A reheating type grain pile special cooling device, such as Figure 1 The figure is a schematic diagram of the operating system of the device of the present invention; the device moves in accordance with the arrow mark of the circulating air in the figure; the circulating air enters the device through the grain cooler (19) and is then filtered through the plate filter (20); the filtered air passes through the evaporator (21) and the heater (22) and performs a fixed cycle in the device;

[0023] like Figure 2 As shown, it includes a refrigerant circulation system, an air reheating system and a programmable control system; the refrigerant circulation system mainly includes a compressor (5), a finned condenser (8) and a finned evaporator (12); a pressure sensor and a temperature sensor are connected to the top of the compressor (5); the left end of the compressor (5) is connected to the top of the finned condenser (8);

[0024] An axial flow fan (9) is fixed vertically above the finned condenser (8) to accelerate exhaustion;

[0025] The bottom end of the finned condenser (8) is connected to the top end of the liquid reservoir (7); the upper right end of the liquid reservoir (7) is connected to one end of a parallel group of an electromagnetic valve (2) and a thermal expansion valve (13); the other end of the parallel group of an electromagnetic valve (2) and a thermal expansion valve (13) is connected to a finned evaporator (12); the finned evaporator (12) is connected to one end of a screw compressor (5), thereby forming a refrigeration cycle system;

[0026] The air reheat system mainly comprises a compressor (5), an electric three-way regulating valve (6), a liquid storage tank (7), a reheat condenser (15), a temperature controller (11) and a refrigerant pipeline; the lower end of the compressor (5) is connected to the top end of the electric three-way regulating valve (6), the right end of the electric three-way regulating valve (6) is connected to the left end of the reheat condenser (15) through a pipeline, and the right end of the reheat condenser (15) is connected to the top end of the liquid storage tank (7); the upper right end of the liquid storage tank (7) is connected to one end of a parallel group of an electromagnetic valve (2) and a thermal expansion valve (13), and the other end of the parallel group of the electromagnetic valve (2) and the thermal expansion valve (13) is connected to a finned evaporator (12); the finned evaporator (12) is connected to one end of the screw compressor (5) to form an air reheat cycle.

[0027] The refrigerant circulation system and the air reheating cycle are both operated by a programmable logic controller (PLC) control device; the programmable logic controller (PLC) is connected to a humidity sensor (18) and an electric three-way regulating valve (6); the humidity of the outlet air is monitored and calculated by the programmable logic controller (PLC) to realize automatic control of the electric three-way regulating valve (6).

[0028] A motor (16) is fixed to the right end of the reheat condenser (15); the motor (16) is connected and fixed to the centrifugal blower (17) via a transmission belt; the right end of the centrifugal blower (17) is connected to the air outlet; and a humidity sensor (18) is provided at the air outlet.

[0029] The left end of the finned evaporator (12) is connected to a return air port; a temperature controller (11) is provided at the return air port; a water retainer (14) is used between the expansion valve (13) and the reheat condenser (15) to separate the two; a second stop valve (4) is provided on a pipeline connecting one end of the reheat condenser (15) to the liquid storage device (7); and a first stop valve (3) is provided on a pipeline connecting the other end of the reheat condenser (15) to the finned condenser (8).

[0030] A finned condenser reheat system is added to the refrigerant circulation system. By increasing the temperature of the air after passing through the evaporator, the relative humidity of the outlet air is reduced to prevent the air humidity blown into the grain pile from being too high, causing condensation on the grain and causing the grain to become moldy.

[0031] The environmentally friendly refrigerant R134A is used in the refrigerant circulation system.

[0032] Working principle of the present invention:

[0033] Refrigeration cycle: The high-temperature and high-pressure gas refrigerant coming out of the compressor (5) enters the finned condenser (8) through the electric three-way regulating valve (6), and after heat exchange with the condensing air in the finned condenser (8), it becomes a medium-temperature and high-pressure refrigerant liquid, enters the liquid storage tank (7), passes through the drying filter (1), passes through the solenoid valve (2), and then passes through the expansion valve (13) and enters the finned evaporator (12), exchanges heat with the air from the granary in the finned evaporator (12), absorbs heat, becomes a low-temperature and low-pressure refrigerant gas, and returns to the compressor (5), completing a refrigeration cycle.

[0034] Air reheat cycle: The high-temperature and high-pressure gas refrigerant from the compressor (5) enters the reheat condenser (15) through the electric three-way regulating valve (6), and exchanges heat with the cold air passing through the finned evaporator (12) in the reheat condenser (15), thereby increasing the air temperature and reducing the relative humidity. After the heat exchange, the condensed air becomes a medium-temperature and high-pressure refrigerant liquid, enters the liquid storage tank (7), passes through the drying filter (1), passes through the solenoid valve (2), and then passes through the expansion valve (13) and enters the finned evaporator (12). In the finned evaporator (12), it exchanges heat with the air from the granary, absorbs heat, and becomes a low-temperature and low-pressure refrigerant gas, which returns to the compressor (5), completing a refrigeration cycle.

[0035] Air reheat control system: By setting the value of the humidity sensor (18), the PLC of the programmable control box (10) calculates the refrigerant distribution amount of the electric three-way regulating valve (6), thereby adjusting the refrigerant flow entering the reheat condenser (15), adjusting the heating amount of the reheat condenser (15), thereby adjusting the air temperature, controlling the relative humidity of the air, and ensuring the safety of the air sent to the grain pile.

Claims

1. A reheating grain pile cooling device, characterized in that: It includes a refrigerant circulation system and an air reheating system; the refrigerant circulation system mainly includes a compressor, a finned condenser and a finned evaporator, and a pressure sensor and a temperature sensor are connected to the top of the compressor; the left end of the compressor is connected to the top of the finned condenser; an axial fan is fixed vertically above the finned condenser to accelerate exhaust; the bottom end of the finned condenser is connected to the top of the liquid reservoir; the upper right end of the liquid reservoir is connected to one end of the parallel group of the electromagnetic valve and the thermal expansion valve; the other end of the parallel group of the electromagnetic valve and the thermal expansion valve is connected to the finned evaporator; the finned evaporator is connected to one end of the screw compressor to form a refrigeration circulation system; The air reheat system mainly includes a compressor, an electric three-way regulating valve, a liquid storage tank, a reheat condenser, a humidity controller and a refrigerant pipeline; the lower end of the compressor is connected to the top end of the electric three-way regulating valve, the right end of the electric three-way regulating valve is connected to the left end of the reheat condenser through a pipeline, and the right end of the reheat condenser is connected to the top end of the liquid storage tank; the finned evaporator is connected to one end of the screw compressor to form an air reheat cycle.

2. The reheat type grain pile dedicated cooling device according to claim 1, characterized in that: The refrigerant circulation system and the air reheating cycle are both operated by a programmable logic controller (PLC) control device; the programmable logic controller (PLC) is connected to a humidity sensor and an electric three-way regulating valve; it monitors the humidity of the outlet air and realizes automatic control of the electric three-way regulating valve through calculation by the programmable logic controller (PLC).

3. The reheat type grain pile dedicated cooling device according to claim 1, characterized in that: A motor is fixed at the right end of the reheat condenser; the motor is connected and fixed to the centrifugal blower through a transmission belt; the right end of the centrifugal blower is connected to the air outlet; a humidity sensor is provided at the air outlet.

4. The reheat type grain pile dedicated cooling device according to claim 1, characterized in that: The left end of the finned evaporator is connected to a return air port; a temperature controller is provided at the return air port, and a water retainer is used to separate the expansion valve and the reheat condenser; a second stop valve is provided on a pipeline connecting one end of the reheat condenser to the liquid reservoir; and a first stop valve is provided on a pipeline connecting the other end of the reheat condenser to the finned condenser.

5. The reheat type grain pile dedicated cooling device according to claim 1, characterized in that: A finned condenser reheating system is added to the refrigerant circulation system, which increases the temperature of the air after passing through the evaporator and reduces the relative humidity of the outlet air, thereby preventing the air humidity blown into the grain pile from being too high, causing condensation on the grain and causing the grain to become moldy.

6. The reheat type grain pile dedicated cooling device according to claim 1, characterized in that: The refrigerant circulation system adopts environmentally friendly refrigerant R134A.

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