CN108716805A - Automatic defrosting around piece heat exchanger - Google Patents

Abstract

The invention discloses a fin-wound heat exchanger for automatic defrosting, which includes a plurality of heat exchange tubes forming a heat exchange unit, and the plurality of heat exchange tubes are installed in an outer frame with front and rear sides open, each of the heat exchange tubes The outer wall is spirally wound with winding sheets, one end of each winding sheet is fixed to one end of the wrapped heat exchange tube, and the other end is connected to a tie rod, and the tie rod protrudes from the outside of the outer frame and is arranged on the outside of the outer frame. The pull plate is connected, and the pull plate is connected with the crankshaft through the connecting rod, and the crankshaft is connected with the motor. The invention utilizes an automatic moving mechanism to drive the winding sheet to move on the surface of the heat exchange tube, prevents the accumulation and solidification of the frost layer outside the heat exchange tube, reduces the thermal resistance of the evaporator, reduces the heat transfer temperature difference, and reduces the pressure ratio of the refrigeration compressor.

Description

Wound heat exchanger with automatic defrosting

technical field

The invention relates to the technical field of refrigeration systems, in particular to a high-efficiency automatic defrosting fin-wound heat exchanger.

Background technique

In the large-scale refrigerated ammonia refrigeration system, the evaporator in the cold room adopts a steel pipe winding evaporator. When the air in the cold room blows through the evaporator, the air temperature is lower than zero Celsius, and frost forms on the outer surface of the heat exchange tube. With the increase of the frost layer, the thermal resistance of the evaporator increases, the heat transfer temperature difference increases, the evaporation temperature decreases, the pressure ratio of the refrigeration compressor increases, the power consumption increases, and the performance of the refrigeration system decreases.

Contents of the invention

The object of the present invention is to provide a high-efficiency automatic defrosting fin-wound heat exchanger for refrigeration systems aiming at the technical defects existing in the prior art.

The technical solution adopted by the present invention to solve its technical problems is:

Wrapped heat exchangers with automatic defrost, including:

A plurality of heat exchange tubes forming a heat exchange unit, the plurality of heat exchange tubes are installed in an outer frame with open front and rear sides, each of the outer walls of the heat exchange tubes is spirally wound with winding sheets, and each of the heat exchange tubes is One end of the winding sheet is fixed to one end of the wrapped heat exchange tube, and the other end is connected to a pull rod, and the pull rod protrudes from the outside of the outer frame to connect with a pull plate arranged outside the outer frame, and the pull plate is connected to the crankshaft through a connecting rod. connected, the crankshaft is connected with the motor.

The outer frame is formed by welding the upper, lower, left, and right sides of the steel plates, wherein the left steel plate is provided with a plurality of perforations corresponding to the number of tie rods for the passage of the tie rods.

One end of the winding sheet is fixed to one end of the heat exchange tube by spot welding, and the other end is welded to one end of the tie rod.

The motor is fixed on the protruding end of the bottom steel plate of the outer frame, the main shaft of the motor is fixedly connected with the main shaft of the crankshaft through a coupling, and the crank pin of the crankshaft is rotatably matched with one end of the connecting rod. The other end of the connecting rod is fixedly connected with the center of the pull plate.

The automatic defrosting fin-wound heat exchanger of the present invention uses an automatic moving mechanism to drive the winding fins to move on the surface of the heat exchange tube, which can prevent the accumulation and solidification of the frost layer outside the heat exchange tube, reduce the thermal resistance of the evaporator, and reduce the heat transfer The temperature difference reduces the pressure ratio of the refrigeration compressor, reduces power consumption, and improves the performance of the refrigeration system.

Description of drawings

Fig. 1 shows the structural representation of the automatic defrosting fin-wound heat exchanger of the present invention;

Fig. 2 is a sectional view along the line A-A of Fig. 1 .

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figure 1 and Figure 2, the schematic diagram of the automatic defrosting fin-wound heat exchanger, including:

Outer frame 1, heat exchange tube 2, winding sheet 3, motor 4, crankshaft 5, connecting rod 6, pull plate 7, tie rod 8;

The outer frame 1 is composed of welded steel plates on the upper, lower, left, and right sides. A plurality of perforations are provided on the left steel plate corresponding to the tie rods 8. The winding sheet 3 is made of metal sheet, and the right end of the winding sheet is spot welded and fixed on the The right end of the heat exchange tube is spirally wound outside the heat exchange tube, and the other left end is welded to one end of the tie rod 8, and the other end of the tie rod 8 passes through the corresponding opening on the left side of the outer frame 1 and the pull plate 7 Fixed connection.

Wherein, the winding sheet is an elongated sheet of metal material with a certain width, and its inner surface wound on the heat exchange tube is in contact with the outer wall surface of the heat exchange tube, and its winding structure is similar to that of a screw conveyor. The winding arrangement structure of the helical blade realizes removing the frost on the surface of the heat exchange tube through the contact between the winding sheet and the heat exchange tube.

The motor 4 is fixed on the protruding end of the bottom plate of the outer frame, the main shaft of the motor 4 is fixedly connected with the main shaft of the crankshaft 5 through a coupling, the crank pin of the crankshaft 5 is rotatably matched with one end of the connecting rod 6, and the other end of the connecting rod 6 One end is fixedly connected with the central position of the pull plate 7 .

Wherein, the fan (not shown) of the evaporator can be fixed on the edge of the outer frame, and its wind direction should be perpendicular to the heat exchange tube.

When frost forms outside the heat exchange tube of the evaporator, start the motor 4, the main shaft of the motor 4 drives the crankshaft 5 to rotate, drives the connecting rod 6 to swing, drives the pull rod 8 to move left and right through the pull plate 7, and moves the winding sheet 3, thereby realizing scraping The frost layer on the outer surface of the heat exchange tube is removed and blown off by the fan. When the frost layer is removed, the motor is stopped.

The above is only a preferred embodiment of the present invention, it should be pointed out that, for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, these improvements and Retouching should also be regarded as the protection scope of the present invention.

Claims (4)

1. automatic defrosting around piece heat exchanger, characterized in that including：

Multiple heat exchanger tubes of heat exchange unit are formed, multiple heat exchanger tubes are mounted in the outline border of front and back side opening, each described It is wound in the shape of a spiral on the outer wall of heat exchanger tube around piece, it is each described solid around one end of piece and one end of the heat exchanger tube wound Fixed, other end connecting rod, the outside that the pull rod stretches out in outline border are connect with the pulling plate being located on the outside of outline border, and the pulling plate is logical It crosses connecting rod to connect with bent axle, the bent axle is connect with motor.

2. according to claim 1 automatic defrosting around piece heat exchanger, characterized in that the outline border is by four sides steel up and down Plate welds to be formed, wherein the quantity that left side steel plate corresponds to pull rod opens up multiple perforation, for passing through for the pull rod.

3. according to claim 1 automatic defrosting around piece heat exchanger, characterized in that the end point solid welding around piece is scheduled on It welds one end of heat exchanger tube one end, the other end and the pull rod.

4. according to claim 1 automatic defrosting around piece heat exchanger, characterized in that the motor is fixed on the outline border On the external part of bottom steel plate, the main shaft of the motor is fixedly connected with the main shaft of bent axle by shaft coupling, the song of the bent axle One end of handle pin and connecting rod rotatably coordinates, and the other end of the connecting rod is fixedly connected with the center of the pulling plate.