CN210951982U

CN210951982U - All-weather defrosting evaporator and air conditioning system using same

Info

Publication number: CN210951982U
Application number: CN201921228477.XU
Authority: CN
Inventors: 徐生恒
Original assignee: 徐生恒
Current assignee: Ruicheng Technology Development Group Ltd.
Priority date: 2019-07-31
Filing date: 2019-07-31
Publication date: 2020-07-07
Anticipated expiration: 2029-07-31

Abstract

The utility model discloses all-weather defrosting evaporator, including two defrosting monomers, a plurality of fan, two defrosting monomers are the V-arrangement symmetry setting, two defrosting monomers bottom links to each other, the top is equipped with the fan mounting bracket, the fan is fixed on the fan mounting bracket, defrosting monomer includes a plurality of dentate fins, a plurality of heat exchange tubes, equidistant stack of a plurality of dentate fins, the heat exchange tube is the U-shaped and passes dentate fin in proper order and links together a plurality of dentate fins, the dentate fin adopts super hydrophobic material to make, the outside limit portion of dentate fin has the tooth; the utility model discloses an air conditioning system using an all-weather defrosting evaporator, which comprises a compressor, a four-way valve, a condenser, an expansion valve and an all-weather defrosting evaporator which are connected in sequence; the utility model discloses all-weather defrosting evaporator and use the air conditioning system of this evaporimeter can avoid frosting, can also make the condensation water drop with higher speed, also can normally heat during the defrosting.

Description

All-weather defrosting evaporator and air conditioning system using same

Technical Field

The utility model relates to an evaporator especially relates to an evaporator that can defrost.

Background

When the air source heat pump unit is in heating operation under normal working conditions, the evaporator absorbs heat from ambient air, so that the surface temperature of the evaporator fins is reduced. With the circulation, the surface temperature of the evaporator fins is continuously reduced until the surface temperature is lower than the dew point temperature of the ambient air, water vapor in the air is condensed on the surfaces of the fins, and if the temperature of the fins is lower than 0 ℃, the surfaces of the fins are frosted. As the cycle continues, the frost layer thickens further, gradually covering the entire evaporator. The specific frosting process comprises the following steps: the water vapor in the air firstly generates heterogeneous nucleation on the cold surface, and the condensed liquid nuclei grow continuously and are combined into condensed liquid drops with a macroscopic scale; with the temperature of the liquid drop falling and freezing, frost crystals are formed on the surface of the frozen liquid drop and grow continuously to form a frost layer gradually. When the supercooling degree of the surface of the frost layer is low and tends to zero, the frost layer continuously grows in the height direction, water vapor enters the frost layer through diffusion to form frost crystals, and the density of the frost layer is increased.

The occurrence of the frost layer increases the heat exchange thermal resistance between air and working media, and seriously hinders the heat exchange performance of the evaporator. Furthermore, the thickening of the frost layer increases the resistance of the air flowing through the fins, reducing the air flow, resulting in a degraded evaporator performance. Both of these problems will result in the heat pump product failing to function properly or even being damaged. Therefore, evaporator defrosting is important.

The defrosting modes commonly used in the heat pump industry at present are thermoelectric defrosting and reverse cycle defrosting. The thermoelectric defrosting is that a resistor with proper power is arranged on a heat exchanger, and when frost layers on an evaporator accumulate to a certain degree, the resistor wire is electrified to generate heat to melt the frost. The reverse cycle defrosting is to start a reversing defrosting program, a four-way reversing valve acts to change the flow direction of a refrigerant, so that a unit is converted from a heating operation state to a cooling operation state, high-temperature gas discharged by a compressor is switched to an outdoor heat exchanger through the four-way valve to be defrosted, and when the temperature of an outdoor coil pipe rises to a certain temperature value, defrosting is finished.

Most domestic air source heat pump water heater production enterprises adopt a hot gas defrosting method, and particularly adopt the reverse circulation defrosting and the hot gas bypass defrosting. The reverse circulation defrosting can affect the water supply of the air source heat pump water heater, the hot gas bypass defrosting can reduce the temperature of the original hot water provided for users, the loss of the defrosting process is equivalent to the halt of twice defrosting time from the energy perspective, and the heat supply of a unit can be reduced by about l 0% through measurement and calculation.

As can be seen from the above, it is very important to adopt a reasonable and effective defrosting mode, and there is an urgent need for an evaporator capable of preventing frost from forming on the surface of the fins of the evaporator from the source.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide an all-weather defrosting evaporator and use air conditioning system of this evaporimeter, it can avoid fin surface frosting, can also make the condensate water drop with higher speed.

The utility model discloses an all-weather defrosting evaporator, including two defrosting monomers, a plurality of fan, two defrosting monomers are V-arrangement symmetry, two defrosting monomers bottom links to each other, the top is equipped with the fan mounting bracket, one side of two defrosting monomers is provided with refrigerant entry Y type pipe and refrigerant export Y type pipe, the fan is fixed on the fan mounting bracket, defrosting monomer includes a plurality of dentate fins, a plurality of heat exchange tubes, the dentate fin adopts super-hydrophobic material to make, the outside portion of dentate fin has the tooth, a plurality of dentate fins are equidistant to stack, each heat exchange tube is the U-shaped dish and revolves and passes the mounting hole of dentate fin in proper order and links together with it, refrigerant entry Y type pipe includes entry tee bend, two entry branch pipes, the entry of entry tee bend is the refrigerant total entry of evaporator, one end of entry branch pipe is connected with two exports of entry, the other end of the inlet branch pipe is closed, the refrigerant outlet Y-shaped pipe comprises an outlet tee joint and two outlet branch pipes, the outlet of the outlet tee joint is a refrigerant main outlet of the evaporator, one end of each outlet branch pipe is connected with two inlets of the outlet tee joint respectively, the other end of each outlet branch pipe is closed, the inlet end of the heat exchange pipe is connected with the pipe wall of the inlet branch pipe and communicated with the inlet branch pipe, and the outlet end of the heat exchange pipe is connected with the pipe wall of the outlet branch pipe and communicated with the outlet branch pipe.

The utility model discloses all-weather defrosting evaporator, wherein, the interval between two adjacent cusp fins is more than or equal to 2.2 mm.

The utility model discloses all-weather defrosting evaporator, wherein, the angle that cusp fin and ground become is 45-60.

The utility model discloses all-weather defrosting evaporator, wherein, every on the dentate fin, the contained angle of two adjacent teeth is 60.

The utility model discloses all-weather defrosting evaporator, wherein, every the tooth of cusp fin is sharp tooth.

The utility model discloses air conditioning system uses above-mentioned all-weather defrosting evaporimeter.

Compared with the prior art, the utility model discloses all-weather defrosting evaporator and use air conditioning system of this evaporimeter have following advantage:

1. the toothed fins are made of super-hydrophobic materials, so that condensed water can be discharged better;

2. the angle formed by the toothed fins and the ground is 45-60 degrees, the teeth of the toothed fins are sharp teeth, so that condensed liquid drops can fall off after flowing through a short stroke, and the heat exchange capacity of the evaporator is enhanced;

3. the distance between the tooth-shaped fins is increased to be at least 2.2mm, so that heat exchange between air and working media is facilitated;

4. the dentate structure combines the positive and negative air supply of fan to let the liquid drop that condenses peel off from the fin faster, avoids frosting.

The following describes the all-weather defrosting evaporator and the air conditioning system using the same with reference to the attached drawings.

Drawings

FIG. 1 is a schematic diagram of an air conditioning system using the all-weather defrosting evaporator of the present invention;

FIG. 2 is a schematic perspective view of the all-weather defrosting evaporator of the present invention;

FIG. 3 is a schematic structural view of a toothed fin in the all-weather defrosting evaporator of the present invention;

FIG. 4 is a schematic view showing the connection between the tooth-shaped fins and the heat exchange tubes in the all-weather defrosting evaporator of the present invention, wherein only the tooth-shaped fins at both ends are shown for clearly showing the connection relationship;

FIG. 5 is a schematic view of the working principle of the all-weather defrosting evaporator of the present invention;

FIG. 6 is a schematic front view of FIG. 4;

FIG. 7 is a rear view of FIG. 4;

FIG. 8 is a left side view of FIG. 4;

FIG. 9 is a right side view of FIG. 4;

FIG. 10 is a top view of FIG. 4;

FIG. 11 is a bottom view of FIG. 4;

FIG. 12 is a schematic view of the heat exchange tubes in the defrost monomer on the left;

fig. 13 is a schematic view of the heat exchange tube in the defrosting monomer on the right side.

Detailed Description

As shown in fig. 1, the utility model discloses use air conditioning system of all-weather defrosting evaporimeter includes all-weather defrosting evaporimeter 1, cross valve 2, condenser 3, expansion valve 4, compressor 5, the end of giving vent to anger of compressor 5 links to each other with the P mouth of cross valve 2, the Q mouth of cross valve 2 links to each other with the entry of condenser 3, the export of condenser 3 links to each other with the entry of expansion valve 4, the export of expansion valve 4 links to each other with all-weather defrosting evaporimeter 1 ' S refrigerant total entry 7, all-weather defrosting evaporator 1 ' S refrigerant total exit 8 links to each other with cross valve 2 ' S S mouth, cross valve 2 ' S R mouth links to each other with compressor 5 ' S. Wherein, the port P is an air inlet, the port R is an air return port, and the port Q and the port S are working ports.

Wherein, a gas-liquid separator 6 is provided between the R port of the four-way valve 2 and the intake end of the compressor 5.

As shown in fig. 2, the all-weather defrosting evaporator 1 includes defrosting units 11 and 11 ', three fans 12, two defrosting units 11 and 11' are symmetrically arranged in a V-shape through a frame 16, bottom ends of the two defrosting units are connected, a fan mounting frame 13 is installed at a top end of the two defrosting units, the fans 12 are fixed on the fan mounting frame 13, the fans 12 realize forward and reverse air supply through forward and reverse rotation of a fan motor, and refrigerant inlet Y-shaped pipes 14 and refrigerant outlet Y-shaped pipes 15 are arranged on front sides of the two defrosting units. As shown in fig. 3, 4, 6, 7, 10, and 11, the defrosting unit 11 includes a plurality of toothed fins 111 and a plurality of heat exchange tubes 112, 5 heat exchange tubes 112 are shown in fig. 4, the plurality of toothed fins 111 are stacked at equal intervals, the interval between two adjacent toothed fins 111 is greater than or equal to 2.2mm, and as shown in fig. 3, 4, 9, and 13, each heat exchange tube 112 sequentially penetrates through the mounting holes 1112 of the toothed fins 111 in a U-shape and is connected with the plurality of toothed fins 111. As shown in fig. 3, the toothed fins 111 are made of super-hydrophobic aluminum, and the outer side portions of the toothed fins 111 have teeth 1111. As shown in fig. 3 and 4, the defrosting unit 11 'also includes a plurality of toothed fins 111' and a plurality of heat exchange tubes 112 ', and 5 heat exchange tubes 112' are shown in the figure, the toothed fins 111 'are stacked at equal intervals, and the interval between two adjacent toothed fins 111' is greater than or equal to 2.2 mm. As shown in fig. 3, 4, 8 and 12, the heat exchange tube 112 ' is formed in a U-shape and spirally passes through the mounting hole 1112 ' of the toothed fin 111 ' in sequence and is connected with the toothed fin. The toothed fins 111 ' are made of super-hydrophobic material, and the outer side edge portions of the toothed fins 111 ' are provided with teeth 1111 '.

As shown in fig. 2-4, the refrigerant inlet Y-tube 14 includes an inlet tee 141, an inlet branch tube 142 'located on the left side, and an inlet branch tube 142 located on the right side, an inlet of the inlet tee 141 is a refrigerant inlet 7 of the evaporator 1, lower ends of the

inlet branch tubes

142 and 142' are respectively connected to two outlets of the inlet tee 141, upper ends of the

inlet branch tubes

142 and 142 'are closed, the refrigerant outlet Y-tube 15 includes an outlet tee 151 and two outlet branch tubes 152 and 152', an outlet of the outlet tee 151 is a refrigerant outlet 8 of the evaporator, lower ends of the outlet branch tubes 152 and 152 'are connected to two inlets of the outlet tee 151, and upper ends of the outlet branch tubes 152 and 152' are closed. The tube walls of the

inlet branch tubes

142 and 142 ' and the outlet branch tubes 152 and 152 ' are respectively provided with 5 holes, each of which is internally connected with a heat exchange tube, as shown in fig. 1, 9 and 13, an inlet end 1121 of the heat exchange tube 112 is connected with the tube wall of the inlet branch tube 142 and communicated with the inlet branch tube 142, an outlet end 1122 of the heat exchange tube 112 is connected with the tube wall of the outlet branch tube 152 and communicated with the outlet branch tube 152, refrigerant flows along the dotted line in fig. 13, as shown in fig. 1, 8 and 12, an inlet end of the heat exchange tube 112 ' is connected with the tube wall of the inlet branch tube 142 ' and communicated with the inlet branch tube 142 ', an outlet end of the heat exchange tube 112 ' is connected with the tube wall of the outlet branch tube 152 ' and communicated with the outlet branch.

As shown in fig. 1, the direction of the arrow in the figure is the refrigerant flow direction during heating, and the refrigerant flows through the refrigerant inlet Y-shaped pipe 14, flows into the heat exchange pipes 112 and 112', merges in the refrigerant outlet Y-shaped pipe 15, and flows out.

As shown in FIG. 5, the angle formed by the toothed fins 111 and the ground is 45 DEG B60 DEG, the angle formed by the toothed fins 111' and the ground is 45 DEG B60 DEG, preferably 60 DEG, and when the angle is 60 DEG, the effect of peeling off the condensed water is the best. When the angle is 45 degrees, the heat exchange effect is best.

As shown in fig. 3, the teeth of the toothed fins 111 are pointed teeth, and an included angle a between two adjacent teeth on each toothed fin 111 is 60 °. The teeth of the toothed fins 111 ' are sharp teeth, and the included angle A ' between every two adjacent teeth on each toothed fin 111 ' is 60 degrees. The utility model discloses use air conditioning system's of all-weather defrosting evaporimeter heating process as follows: when heating, the P port and the Q port of the four-way valve 2 are communicated, the S port and the R port are communicated, high-temperature and high-pressure refrigerant steam discharged by the compressor 5 flows into the condenser 3 through the P port and the Q port of the four-way valve 2, and the heat emitted when the refrigerant steam is condensed heats indoor air to achieve the purpose of indoor heating. The condensed liquid refrigerant passes through the expansion valve 4 and then becomes a low-temperature low-pressure refrigerant, enters the all-weather defrosting evaporator 1, absorbs the heat of outdoor air energy to be evaporated, and the evaporated refrigerant steam passes through the S port and the R port of the four-way valve 2, is subjected to gas-liquid separation through the gas-liquid separator 6 and then is sucked by the compressor 5, so that the heating cycle is completed. With the circulation, the surface temperature of the toothed fins 111 and 111 'of the all-weather defrosting evaporator 1 is reduced, when condensed liquid drops are formed on the surfaces of the toothed fins, the condensed liquid drops gradually gather at the tooth tips of the toothed fins 111 and 111' under the action of gravity, and fall off from the tooth tips after certain weight is collected, and the tooth tips have the function of collecting the condensed liquid drops, so that the flow of the condensed liquid drops on the toothed fins is shortened, the falling of the condensed liquid drops is accelerated, and the heat exchange effect of the fins is improved. When the fan 12 is running in the forward direction, the cold air around the evaporator can be taken away, and the evaporation process is accelerated. As shown in fig. 5, the fan is controlled to run reversely, and the fan blows condensed liquid drops to gather to the tooth tips when running reversely, so that the dropping of the condensed liquid drops can be further accelerated, the heat exchange is improved, and the frosting is effectively and thoroughly inhibited.

The utility model discloses a super hydrophobic aluminium fin carries out frosting continuous test 120min under the cold surface temperature of fin-10 ℃ condition, and the frost height is the high 50% of ordinary aluminium fin cold surface formation frost. In addition, the frost crystals formed on the surface of the super-hydrophobic aluminum fin are short, small and loose and are easy to remove. The utility model can also adopt the fins made of super-hydrophobic copper and the like.

The above-mentioned embodiments are only for describing the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art without departing from the design spirit of the present invention should fall into the protection scope defined by the claims of the present invention.

Claims

1. An all-weather defrosting evaporator (1), characterized in that: the defrosting device comprises two defrosting monomers (11, 11 ') and a plurality of fans (12), wherein the two defrosting monomers (11, 11 ') are symmetrically arranged in a V shape, the bottom ends of the two defrosting monomers (11, 11 ') are connected, the top ends of the two defrosting monomers (11, 11 ') are provided with a fan mounting rack (13), one sides of the two defrosting monomers (11, 11 ') are provided with a refrigerant inlet Y-shaped pipe (14) and a refrigerant outlet Y-shaped pipe (15), the fans (12) are fixed on the fan mounting rack (13), the defrosting monomers (11, 11 ') comprise a plurality of toothed fins (111, 111 ') and a plurality of heat exchange pipes (112, 112 '), the toothed fins (111, 111 ') are made of a super-hydrophobic material, the outer side parts of the toothed fins (111, 111 ') are provided with teeth (1111, 1111 ') which are overlapped at equal intervals, and each toothed fin (111, 111 ') penetrates through the toothed fins (111, 112 ') in a U, 111 ') and connected together, the refrigerant inlet Y-shaped pipe (14) comprises an inlet tee joint (141) and two inlet branch pipes (142, 142 '), the inlet of the inlet tee joint (141) is a refrigerant main inlet of the evaporator, one end of each inlet branch pipe (142, 142 ') is connected with two outlets of the inlet tee joint (141), the other end of each inlet branch pipe (142, 142 ') is closed, the refrigerant outlet Y-shaped pipe (15) comprises an outlet tee joint (151) and two outlet branch pipes (152, 152 '), the outlet of the outlet tee joint (151) is a refrigerant main outlet of the evaporator, one end of each outlet branch pipe (152, 152 ') is connected with two inlets of the outlet tee joint (151), the other end of each outlet branch pipe (152, 152 ') is closed, the inlet end of each heat exchange pipe (112, 112 ') is connected with the pipe wall of the inlet branch pipe (142, 142 ') and is connected with the pipe wall of the inlet branch pipe (142 ), 142 ') and the outlet ends of the heat exchange tubes (112, 112') are connected to the wall of the outlet leg (152, 152 ') and communicate with the outlet leg (152, 152').

2. The all-weather defrost evaporator of claim 1 further comprising: the distance between two adjacent toothed fins (111, 111') is more than or equal to 2.2 mm.

3. The all-weather defrost evaporator of claim 2 further comprising: the angle (B, B ') formed by the tooth-shaped fins (111, 111') and the ground is 45-60 degrees.

4. The all-weather defrost evaporator of claim 3 wherein: on each piece of the toothed fins (111, 111 '), the included angle (A, A') of two adjacent teeth is 60 degrees.

5. The all-weather defrost evaporator of claim 4 further comprising: the teeth (1111, 1111 ') of each piece of the toothed fin (111, 111') are pointed teeth.

6. An air conditioning system using the all weather defrost evaporator (1) as claimed in any one of claims 1-5.