CN204313550U - A kind of air automatic defrosting device - Google Patents

Abstract

The utility model discloses an automatic air defrosting device, which comprises an air compressor connected integrally, a heatless regenerative adsorption dryer, an air storage tank, a pipeline muffler and an evaporator, and the evaporator is provided with several fins The air compressor is connected to the heatless regenerative adsorption dryer, and the heatless regenerative adsorption dryer is connected to the air storage tank. There are several electromagnetic pulse valves on the air storage tank, and one end of the pipe silencer is connected to the outlet of the electromagnetic pulse valve. , The other end is connected to the finned tube. There are several nozzles on the finned tube. The air blown in during use is normal temperature air, which can quickly blow off and melt the frost on the heat exchange fin of the evaporator, and can also be set according to the frosting situation. Purge interval time and prolong frosting time to improve efficiency. PLC controller can be incorporated into PLC program of quick-freezing device to reduce investment cost. The nozzles are evenly distributed, stable in performance and not easy to block, which improves the efficiency of quick-freezing device and also improves the efficiency. Save a lot of water resources.

Description

An air automatic defrosting device

technical field

The utility model relates to the field of low-temperature quick-freezing, in particular to an air automatic defrosting device in the field of continuous-operation rapid cooling lines.

technical background

With the increase of quick-frozen food, the utilization efficiency of quick-freezing equipment is also increasing. When the internal ambient temperature of the quick-freezing device is -35°C, when the quick-freezing machine runs for a period of time, the evaporator begins to frost, and the thicker it is, the thicker it is. The heat exchange efficiency of the evaporator is reduced. In this case, the general enterprise will defrost the evaporator after 8 hours of production. However, most of the evaporators of the current quick-freezing equipment adopt the form of water flushing, and must Under normal circumstances, this time takes 2-4 hours, and the internal temperature of the quick-freezing device will rise to normal temperature during defrosting. When producing again, it is necessary to start the machine and lower the temperature of the quick-freezing device to -35°C before starting production. This process That is to say, the waste of frosting water, the waste of energy consumption for the initial cooling of the compressor, and the waste of labor time also greatly reduce the use efficiency of the equipment.

Utility model content

The technical problem to be solved by the utility model is to provide an automatic air defrosting device, which replaces the original regular water defrosting design with irregular air defrosting, so that defrosting can be completed without stopping the machine, saving a lot of water Resources, greatly improving the efficiency of the quick-freezing device.

The technical solution adopted by the utility model is: an automatic air defrosting device, including an air compressor connected integrally, a heatless regenerative adsorption dryer, an air storage tank, a pipeline muffler and an evaporator. Several finned tubes are provided, and the feature is that the air compressor is connected with a heatless regeneration adsorption dryer, and the heatless regeneration adsorption dryer is connected with an air storage tank, and several air storage tanks are provided with An electromagnetic pulse valve, one end of the pipeline muffler is connected to the outlet of the electromagnetic pulse valve, and the other end is connected to a finned tube, and the finned tube is provided with several nozzles.

The heatless regenerative adsorption dryer uses activated alumina or molecular sieve as the adsorbent.

The electromagnetic pulse valve is connected with the output signal of the PLC controller.

The pipe muffler is wrapped with a flexible connecting pipe.

The number of the electromagnetic pulse valve, pipeline muffler and finned tube is the same, and there are at least two.

The nozzles are evenly distributed on the finned tubes, and the nozzles are QZ1 solid nozzles with a movable swirl core structure.

When the air automatic defrosting device of the utility model is used, the air blown in is normal temperature air, which can quickly blow off and melt the frost on the heat exchange sheet of the evaporator, and can also set the purge interval time and prolong the frosting time according to the frosting situation. To improve efficiency, the PLC controller can be incorporated into the PLC program of the quick-freezing device to reduce investment costs. The nozzles are evenly distributed, stable in performance and not easy to clog, which improves the use efficiency of the quick-freezing device and saves a lot of water resources.

Description of drawings

Fig. 1 is a schematic diagram of the utility model.

detailed description

Below in conjunction with accompanying drawing, the utility model is described further.

As shown in Figure 1, an air automatic defrosting device of the present utility model includes an air compressor 1 connected integrally, a heatless regenerative adsorption dryer 2, an air storage tank 3, a pipeline silencer 5 and an evaporator 8 , there are several finned tubes 7 in the evaporator, and the air compressor is connected to the heatless regenerative adsorption dryer, which uses activated alumina or molecular sieve as the adsorbent, while the heatless regenerative adsorption dryer The dryer is connected with the gas storage tank, and the gas storage tank is equipped with several electromagnetic pulse valves 4 controlled by the output signal of the PLC controller. One end is connected to the finned tube, and the finned tube is provided with a number of nozzles 6, which are evenly distributed on the finned tube, adopt a movable swirl core structure, and are QZ1 type solid nozzles.

The characteristics of the above-mentioned devices are as follows: the displacement of the air compressor is required to be no less than 18 cubic meters per hour, the rated discharge pressure is 0.8Mpa, the discharge temperature is ≤40°C, the number of stages of the compressor is single-stage, and the working environment temperature is -5～ +45°C, the cooling method is air cooling, the noise value is less than 70 decibels, the power supply requirement is 380V, 50Hz; the rated processing capacity of the non-heat regenerative adsorption dryer is 144 cubic meters per hour, the rated inlet temperature is ≤40°C, and the working pressure is not greater than 0.8Mpa, pressure drop ≤0.2Mpa, pressure dew point -40°C, regeneration method, no heat regeneration, regeneration gas consumption 15%, activated alumina or molecular sieves are used as adsorbents, and the amount of residual oil in the intake air is less than 0.1mg per cubic meter; The internal volume of the gas tank is not less than 0.18 cubic meters, and the rated working pressure is 0.8Mpa. It needs to have a pressure vessel certificate and has a safety valve protection; the electromagnetic pulse valve is controlled by the output signal of the PLC controller, and blows frost to the evaporator heat exchange fins in turn. ,Working pressure: 0.4～0.8Mpa, ambient temperature: -10～55(℃), using medium: clean, dry and non-heated air, diaphragm life, more than 1 million blowing times; pipeline silencer is ordinary pipeline silencer, plus Flexible connecting pipe, the working pressure is not less than 0.8Mpa; the nozzle is a QZ1 solid nozzle, which is a movable swirling core type, with a compact structure, a full cone water spray shape, uniform distribution, stable performance and not easy to block.

When in use, use the air compressor to compress the air into the heatless regenerative adsorption dryer. The air passes through activated alumina, molecular sieves, filters, and dries to become heatless and dry air, which is stored in the air storage tank through the air pipeline. , the user can use the PLC controller output signal to control the switch of each electromagnetic pulse valve according to the frosting situation, so as to set the purge interval and prolong the frosting time; the gas passes through the electromagnetic pulse valve controlled by the PLC controller output signal, and passes through the pipeline silencer Reduce noise, enter the finned tube of the evaporator, spray out from the nozzle, and complete frosting, which not only improves the use efficiency of the quick-freezing device, but also saves a lot of water resources.

Claims (6)

1. An air automatic defrosting device, including an air compressor (1), a heatless regenerative adsorption dryer (2), an air storage tank (3), a pipeline silencer (5) and an evaporator ( 8), the evaporator is provided with a number of finned tubes (7), characterized in that the air compressor is connected to a heatless regenerative adsorption dryer, and the heatless regenerative adsorption dryer is connected to an air storage tank , several electromagnetic pulse valves (4) are arranged on the gas storage tank, one end of the pipeline muffler is connected to the outlet of the electromagnetic pulse valve, and the other end is connected to a finned tube, and several nozzles are arranged on the finned tube (6). 2. The air automatic defrosting device according to claim 1, characterized in that the heatless regenerative adsorption dryer uses activated alumina or molecular sieve as the adsorbent. 3. The air automatic defrosting device according to claim 1, characterized in that the electromagnetic pulse valve is connected with the output signal of the PLC controller. 4. The air automatic defrosting device according to claim 1, characterized in that, the pipe muffler is wrapped with a flexible connecting pipe. 5. The air automatic defrosting device according to claim 1, characterized in that the number of the electromagnetic pulse valve, pipeline muffler and finned tube is the same, and there are at least two. 6 . The air automatic defrosting device according to claim 1 , wherein the nozzles are evenly distributed on the finned tubes, and the nozzles are QZ1 type solid nozzles with movable swirl core structure.