CN219160901U

CN219160901U - Variable frequency grain dryer

Info

Publication number: CN219160901U
Application number: CN202223516295.7U
Authority: CN
Inventors: 王琳玉; 潘长安; 李耀全
Original assignee: JIANGSU SIMPSON NEW ENERGY CO Ltd
Current assignee: JIANGSU SIMPSON NEW ENERGY CO Ltd
Priority date: 2022-12-28
Filing date: 2022-12-28
Publication date: 2023-06-09
Anticipated expiration: 2032-12-28

Abstract

The utility model discloses a variable frequency grain dryer, which belongs to the technical field of heat pump dryers, and comprises an air source heat pump and a drying tower, wherein the air source heat pump is communicated with the drying tower through a blower, the air source heat pump comprises a first heating device and a second heating device, the first heating device comprises a first variable frequency compressor, a first condenser, a first throttle valve and a first evaporator, the second heating device comprises a second fixed frequency compressor, a second condenser, a second throttle valve and a second evaporator, the first condenser and the second condenser are communicated with the blower, a first temperature and humidity sensor is arranged on the first evaporator, a second temperature and humidity sensor is arranged on the second evaporator, and a third temperature and humidity sensor is arranged in the blower. The utility model ensures the stability of the air outlet temperature of the heat pump, has small deviation of the air outlet temperature and good grain drying effect; and the damage caused by frequent start of the compressor is avoided, and the overall energy consumption is reduced.

Description

Variable frequency grain dryer

Technical Field

The utility model belongs to the technical field of heat pump dryers, and particularly relates to a variable-frequency grain dryer.

Background

The air source heat pump air heater is widely applied in the field of grain drying, and some drying enterprises put forward high requirements on the grain yield, the whole polished rice rate, the moisture, the hardness and the color of rice, wheat and sorghum, and the prices of grains sold with different moisture are different, so that the requirements of the enterprises on the air outlet temperature of the grain drying heat pump air heater are higher and higher. At present, a fixed-frequency heat pump is often adopted as an air source heat pump air heater, and the temperature of the air outlet is unstable due to the fixed-frequency heat pump air heater, so that the surface temperature of the dried grain crops is uneven in cooling and heating, the quality grade is reduced, and the selling price is low.

Disclosure of Invention

Technical problems: aiming at the problems in the prior art, the utility model aims to solve the technical problems that the variable frequency grain dryer provides stable drying air outlet temperature and improves grain drying effect.

The technical scheme is as follows: in order to solve the technical problems, the utility model adopts the following technical scheme:

the utility model provides a frequency conversion grain drying-machine, includes air source heat pump and drying tower, the air source heat pump pass through the forced draught blower with the drying tower intercommunication, the air source heat pump includes first heating device and second heating device, first heating device include first inverter compressor, with first condenser that first inverter compressor is connected, with first choke valve that first condenser is connected and with first evaporimeter that first choke valve is connected, first evaporimeter with first inverter compressor is connected, be equipped with first evaporation fan on the first evaporimeter, the second heating device include the second condenser that the second is fixed frequency compressor is connected, with the second choke valve that the second condenser is connected and with the second evaporimeter that the second choke valve is connected, the second evaporimeter with the second is fixed frequency compressor is connected, be equipped with the second evaporation fan on the second evaporimeter, first condenser and second condenser with be equipped with the second temperature and humidity sensor on the second evaporimeter, be equipped with the second temperature and humidity sensor.

Preferably, the first variable frequency compressor is connected with the first condenser and the first evaporator through a first four-way valve, and the second fixed frequency compressor is connected with the second condenser and the second evaporator through a second four-way valve.

Preferably, the first evaporator and the second evaporator are both provided with electric heaters.

Preferably, the first evaporation fan adopts a variable frequency fan.

Preferably, the air source heat pump further comprises an electric control device, the first temperature and humidity sensor, the second temperature and humidity sensor and the third temperature and humidity sensor are all electrically connected with the electric control device, and the first heating device and the second heating device are all electrically connected with the electric control device.

Preferably, the number of the first heating devices is more than one.

The beneficial effects are that: compared with the prior art, the utility model has the following advantages:

1. by arranging two heating devices with a first variable-frequency compressor and a second fixed-frequency compressor, the air outlet is heated successively, the output energy of the variable-frequency compressor is adjustable, the stability of the air outlet temperature of the heat pump is ensured, the deviation of the air outlet temperature is small, and the grain drying effect is good;

2. the two compressors are used, so that damage caused by frequent starting of the compressors is avoided in grain drying operation, and the overall energy consumption is reduced;

3. the evaporator is provided with a first evaporator and a second evaporator, the evaporators can respectively perform defrosting operation, a variable-frequency fan is adopted by a first evaporation fan of the first evaporator, and the frosting time of the evaporators in a low-temperature environment is slowed down.

Drawings

FIG. 1 is a schematic diagram of the principle and structure of the present utility model;

FIG. 2 is a schematic diagram of the structure of the present utility model.

Detailed Description

The utility model will be further illustrated with reference to specific examples, which are carried out on the basis of the technical solutions of the utility model, it being understood that these examples are only intended to illustrate the utility model and are not intended to limit the scope thereof.

As shown in fig. 2, the variable-frequency grain dryer comprises an air source heat pump 1 and a drying tower 2, wherein the air source heat pump 1 is communicated with the drying tower 2 through a blower 3, the blower 3 conveys hot air generated by the air source heat pump 1 into the drying tower 2 to dry grains in the drying tower 2, the grains and the like are vaporized and evaporated by the moisture in the materials in a hot air mode, and the wet air emitted by the grains and the like is taken out of the drying tower, so that the purpose of drying the grains is achieved.

As shown in fig. 1 and 2, the air source heat pump 1 comprises a first heating device, a second heating device and an electric control device 7, wherein the first heating device comprises a first variable frequency compressor 11, a first four-way valve 15 connected with the first variable frequency compressor 11, a first condenser 12 connected with the first four-way valve 15, a first liquid storage 16 connected with the first condenser 12, a first throttle valve 13 connected with the first liquid storage 16, a first evaporator 14 connected with the first throttle valve 13 and a first gas-liquid separator 17 connected with the first variable frequency compressor 11, the refrigerant is compressed in the first variable frequency compressor 11, then is heated and boosted, enters the first condenser 12 through the first four-way valve 15, exchanges heat with air flowing through the first condenser 12 in the first condenser 12, is condensed into liquid, then passes through the first liquid storage 16 and the first throttle valve 13, then reaches the first evaporator 14, is evaporated into gas in the first evaporator 14, and then passes through the first gas-liquid separator 17 again through the first four-way valve 15, and then passes through the first variable frequency compressor 11, thus forming a heat cycle; the second heating device comprises a second constant frequency compressor 41, a second four-way valve 45 connected with the second constant frequency compressor 41, a second condenser 42 connected with the second four-way valve 45, a second liquid storage 46 connected with the second condenser 42, a second throttle valve 43 connected with the second liquid storage 46, a second evaporator 44 connected with the second throttle valve 43 and a second gas-liquid separator 47 connected with the second constant frequency compressor 41, wherein the refrigerant is compressed in the second constant frequency compressor 41, then is heated and boosted, enters the second condenser 42 through the second four-way valve 45, exchanges heat with air flowing through the second condenser 42 in the second condenser 42, is condensed into liquid, then passes through the second liquid storage 46 and the second throttle valve 43, then reaches the second evaporator 44, is evaporated into gas in the second evaporator 44, and then passes through the second four-way valve 45 and then passes through the second gas-liquid separator 47 to return to the second constant frequency compressor 41, thus forming a heating work cycle.

As shown in fig. 1 and 2, the first evaporator 14 and the second evaporator 44 are fin-type evaporators, the two evaporators are V-shaped, the first evaporator 14 is provided with a first evaporation fan 141, the second evaporator 44 is provided with a second evaporation fan 441, and the two evaporation fans guide airflow to pass through the V-shaped evaporators, so that evaporation efficiency is improved. The first evaporator 14 is provided with a first temperature and humidity sensor 51, the second evaporator 44 is provided with a second temperature and humidity sensor 52, the two temperature and humidity sensors can acquire the external temperature of the evaporator and send temperature signals to the electric control device 7, the electric control device 7 is electrically connected with the first heating device and the second heating device, when the temperature and humidity sensors acquire that the external temperature of the evaporator is too low, the electric control device 7 controls the first heating device and the second heating device to enter a defrosting mode, at the moment, the first four-way valve 15 and the second four-way valve 45 act, the first condenser 12 and the second condenser 42 become an 'evaporator', the first evaporator 14 and the second evaporator 44 become a 'condenser' to enable the surface of the evaporator to defrost, the first heating device and the second heating device can simultaneously enter the defrosting mode and also independently enter the defrosting mode after defrosting is finished. The electric heaters 6 are arranged on the first evaporator 14 and the second evaporator 44, the electric heaters 6 are electrically connected with the electric control device 7, and when frosting on the surfaces of the two evaporators is not serious, the electric control device 7 can control the electric heaters 6 to work so as to defrost the surfaces of the two evaporators. The first evaporation fan 141 adopts a variable frequency fan, and the electric control device 7 controls the working frequency of the first evaporation fan 141 to slow down the frosting time of the first evaporation fan in a low-temperature environment.

As shown in fig. 1, the first condenser 12 and the second condenser 42 are communicated with the blower 3, the first condenser 12 is arranged in the downwind direction of the second condenser 42, the air is heated through the second condenser 42 and then is reheated through the first condenser 12, finally, the air is sent into the drying tower 2 through the blower 3, a third temperature and humidity sensor 53 is arranged in the blower 3, the third temperature and humidity sensor 53 is electrically connected with the electric control device 7, the electric control device 7 controls the operation of the first variable frequency compressor 11 and the second fixed frequency compressor 41 according to the temperature signal at the outlet of the blower 3, as the first variable frequency compressor 11 adopts the variable frequency compressor, the second fixed frequency compressor 41 adopts the fixed frequency compressor, the heating amount of the first condenser 12 is fixed, the air outlet temperature can be fixed above 40 ℃, the heating amount of the second condenser 42 can be adjusted according to the requirement, the multi-stage air outlet temperature range can be adjusted between 40 ℃ and 70 ℃, the control effect is good, the economic benefit is high, the number of the first variable frequency compressors can be arranged a plurality of times, the number of the first variable frequency compressors can meet the requirement of the air outlet temperature of the blower 3, the different grain drying temperature can be further heated, and the different grain temperature can be formed before the different, and the different grain drying temperature is heated.

The foregoing is merely a preferred embodiment of the present utility model and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present utility model, which are intended to be comprehended within the scope of the present utility model.

Claims

1. The utility model provides a variable frequency grain dryer, its characterized in that includes air source heat pump (1) and drying tower (2), air source heat pump (1) through forced draught blower (3) with drying tower (2) intercommunication, air source heat pump (1) include first heating device and second heating device, first heating device includes first inverter compressor (11), with first condenser (12) that first inverter compressor (11) are connected, with first choke valve (13) that first condenser (12) are connected and with first evaporator (14) that first choke valve (13) are connected, first evaporator (14) with first inverter compressor (11) are connected, be equipped with first evaporation fan (141) on first evaporator (14), second heating device includes second constant frequency compressor (41), with second condenser (42) that second constant frequency compressor (41) are connected, with second choke valve (43) that second condenser (42) are connected and second evaporator (44) are equipped with second choke valve (43) and second evaporator (44), the first condenser (12) and the second condenser (42) are communicated with the air feeder (3), a first temperature and humidity sensor (51) is arranged on the first evaporator (14), a second temperature and humidity sensor (52) is arranged on the second evaporator (44), and a third temperature and humidity sensor (53) is arranged in the air feeder (3).

2. The variable frequency grain dryer according to claim 1, characterized in that the first variable frequency compressor (11) is connected to the first condenser (12) and the first evaporator (14) through a first four-way valve (15), and the second fixed frequency compressor (41) is connected to the second condenser (42) and the second evaporator (44) through a second four-way valve (45).

3. The variable frequency grain dryer according to claim 1, characterized in that the first evaporator (14) and the second evaporator (44) are provided with electric heaters (6).

4. The variable frequency grain dryer of claim 1, wherein the first evaporation fan (141) is a variable frequency fan.

5. The variable frequency grain dryer according to claim 1, wherein the air source heat pump (1) further comprises an electric control device (7), the first temperature and humidity sensor (51), the second temperature and humidity sensor (52) and the third temperature and humidity sensor (53) are all electrically connected with the electric control device (7), and the first heating device and the second heating device are all electrically connected with the electric control device (7).

6. The variable frequency grain dryer of claim 1, wherein the number of the first heating devices is more than one.