CN214307697U

CN214307697U - Fin evaporator

Info

Publication number: CN214307697U
Application number: CN202120222822.XU
Authority: CN
Inventors: 张建华; 曹德云
Original assignee: Square Technology Group Co Ltd
Current assignee: Square Technology Group Co Ltd
Priority date: 2021-01-26
Filing date: 2021-01-26
Publication date: 2021-09-28
Anticipated expiration: 2031-01-26

Abstract

The utility model relates to a fin evaporator, including the feed pipe, set up the expansion valve on the feed pipe, the branch liquid head, branch liquid pipe, heat exchange assemblies, perpendicular collector, the horizontal collector in upper portion, U type heat exchange tube, the horizontal collector in lower part, perpendicular return-air house steward, the horizontal return-air house steward of series connection in proper order with the feed pipe, be provided with the branch pipe of giving vent to anger between expansion valve and the knockout, be provided with air inlet branch on the horizontal return-air house steward. The utility model discloses fully guaranteed the superheat degree under the prerequisite that does not influence refrigeration effect, solved the frozen problem of finned evaporator lower part simultaneously, provide reliable assurance to finned evaporator steam defrosting.

Description

Fin evaporator

Technical Field

The utility model relates to an evaporimeter field especially relates to a fin evaporator.

Background

In the existing finned evaporator, refrigerant liquid is throttled and depressurized by an expansion valve, then enters a heat exchange tube through a liquid separator and a liquid separating tube, then directly enters a vertical air return header, and then is directly connected to an air suction port of a compressor through a horizontal pipeline. Because the liquid supply amount of the refrigerant of the dry type refrigeration system is controlled by the expansion valve, in order to ensure the reliable operation of the compressor, the superheat degree of a suction port of the compressor is required to be ensured to be 7-15 ℃, and the superheat degree is required to be arranged in the last 10-15% pipe section of the heat exchange pipe, so that the liquid impact is not generated when the compressor operates. Therefore, the 10% -15% finned heat exchange tube is useless for refrigerating equipment. This necessarily sacrifices part of the heat transfer area of the finned evaporator. On the other hand, when the hot air is defrosted, the hot air directly enters the heat exchange tube from the collecting tube, and on the same vertical plane, the temperatures of the surfaces of the fins and the temperature in the heat exchange tube are similar. To sum up known, when carrying out the steam defrosting, because upper portion ice is heated and becomes water along fin surface downflow, the intraductal heat of lower part fin is more and more few, and the heat is not enough when getting rid of surface ice, just sticks together in lower fin portion icing easily, causes the fin evaporator to defrost incomplete, and the accumulation is in the month, very easily causes the evaporimeter to stick together ice influence refrigeration effect.

Disclosure of Invention

The utility model aims at providing a fin evaporator to above-mentioned problem.

The utility model provides a technical scheme that its technical problem adopted is: the fin evaporator comprises a liquid supply pipe, an expansion valve arranged on the liquid supply pipe, a liquid distribution head, a liquid distribution pipe, a heat exchange assembly, a vertical collecting pipe, an upper horizontal collecting pipe, a U-shaped heat exchange pipe, a lower horizontal collecting pipe, a vertical air return main pipe and a horizontal air return main pipe which are sequentially connected with the liquid supply pipe in series, wherein an air outlet branch pipe is arranged between the expansion valve and the liquid distribution device, and an air inlet branch pipe is arranged on the horizontal air return main pipe.

Further specifically, the heat exchange assembly comprises a plurality of heat exchange tubes, fins expanded on the heat exchange tubes and U-shaped tubes connected with the heat exchange tubes, and the vertical collecting tubes are connected with the heat exchange tubes.

Further specifically, the U-shaped heat exchange tube comprises a U-shaped tube and two heat exchange tubes, and the U-shaped tube is connected with the two heat exchange tubes.

More specifically, the fin is made of aluminum foil.

Further specifically, an oil return bend is arranged at the joint of the lower horizontal header and the vertical air return header.

Further specifically, the oil return elbow comprises two 45-degree elbows and a 90-degree elbow, the 90-degree elbow is connected with the two 45-degree elbows, and one ends, far away from the 90-degree elbow, of the two 45-degree elbows are respectively connected with the lower horizontal header and the vertical air return header.

Further specifically, one side of the fin evaporator, which is opposite to the vertical air return main pipe, is provided with an air suction type fan.

More specifically, the U-shaped heat exchange tubes are connected to the top of the lower horizontal header.

Further specifically, a temperature sensing bulb is arranged on the horizontal air return main pipe and connected with the expansion valve.

Further specifically, an outer balance connecting pipe is arranged on the horizontal air return main pipe and connected with the expansion valve.

The utility model has the advantages that: after adopting above-mentioned structure, fully guaranteed the superheat degree under the prerequisite that does not influence refrigeration effect, solved the frozen problem of finned evaporator lower part simultaneously, provide reliable assurance to finned evaporator steam defrosting.

Drawings

Fig. 1 is a first schematic structural diagram of the present invention;

FIG. 2 is a second schematic structural diagram of the present invention;

fig. 3 is a schematic view of the oil return bending structure of the present invention;

FIG. 4 is a schematic view of the heat exchange tubes and lower horizontal header connection of the present invention;

FIG. 5 is a schematic diagram of the present invention during refrigeration;

fig. 6 is a schematic diagram of the present invention during defrosting.

In the figure: 1. a liquid supply tube; 2. an expansion valve; 3. a liquid separation head; 4. a liquid separating pipe; 5. a heat exchange assembly; 6. a vertical header; 7. an upper horizontal header; 8. a U-shaped heat exchange tube; 9. a lower horizontal header; 10. a vertical return air manifold; 11. a horizontal return air main; 12. an air outlet branch pipe; 13. an intake branch pipe; 14. oil return bending; 15. an air suction type fan; 21. a temperature sensing bulb; 22. an outer balance connecting pipe; 51. a heat exchange pipe; 52. a U-shaped pipe; 141. bending a pipe at 45 degrees; 142. a 90 degree elbow.

Detailed Description

In order to make the purpose, technical solution and advantages of the present invention clearer, the following will combine the drawings in the embodiments of the present invention to perform more detailed description on the technical solution in the embodiments of the present invention. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are only some, but not all embodiments of the invention. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "central", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the scope of the invention.

As shown in fig. 1-4, a fin evaporator includes a liquid supply pipe 1, an expansion valve 2 disposed on the liquid supply pipe 1, a liquid dividing head 3, a liquid dividing pipe 4, a heat exchange assembly, a vertical header 6, an upper horizontal header 7, a U-shaped heat exchange pipe 8, a lower horizontal header 9, a vertical air return header 10, and a horizontal air return header 11 connected in series with the liquid supply pipe 1 in sequence, an air outlet branch pipe 12 is disposed between the expansion valve 2 and the liquid divider, and an air inlet branch pipe 13 is disposed on the horizontal air return header 11.

The heat exchange assembly comprises a plurality of heat exchange tubes 51, fins expanded on the heat exchange, and U-shaped tubes 52 connected with the heat exchange tubes 51, and the vertical header 6 is connected with the heat exchange tubes 51. The U-shaped heat exchange tube 8 comprises a U-shaped tube 52 and two heat exchange tubes 51, and the U-shaped tube 52 is connected with the two heat exchange tubes 51.

As shown in fig. 5 and 6, the refrigerant liquid enters the expansion valve 2 through the liquid supply pipe 1, the refrigerant at low temperature and low pressure passes through the liquid distribution pipe 4 of the liquid distribution head 3 and enters the plurality of groups of heat exchange pipes 51 respectively, the refrigerant liquid is evaporated in the heat exchange pipes 51 in a heat absorption manner, the temperature of the outer surfaces of the heat exchange pipes 51 and the outer surfaces of fins is reduced and frosted, the heat exchange pipes 51 go back and forth in a plurality of ways and finally enter the vertical header 6, the refrigerant liquid which is not evaporated enters the upper horizontal header 7 under the action of gravity, and a small amount of refrigerant liquid enters the U-shaped heat exchange pipe 8 again to be evaporated in a heat absorption manner and is connected to the lower horizontal header 9 through the U-shaped heat exchange pipe 8. The heat exchange tube 51 is arranged at the lowest part of the fin evaporator, the overheating part in the heat exchange tube 51 is arranged on the heat exchange tube 51 at the lowest part, and the fin heat exchange efficiency is improved; when hot air is defrosted, high-temperature hot air enters the horizontal air return header pipe 11 through the air inlet branch pipe 13, then enters the vertical air return header pipe 10 and the lower horizontal header pipe 9, and high-temperature refrigerant hot air enters the U-shaped heat exchange pipe 8, so that the lower fins and the frost layer on the surface of the U-shaped heat exchange pipe 8 are quickly removed, and then enters the upper horizontal header pipe 7. Along with entering the vertical header 6 and then entering the heat exchange tube 51, the defrosting of the heat exchange tube 51 and the surface of the fin is realized. The lower layer frost of a common fin evaporator is difficult to completely dissolve, and after the method is adopted, high-temperature hot gas enters the lower heat exchange tube 51 preferentially, so that the complete and sufficient defrosting is ensured.

And an oil return bend 14 is arranged at the joint of the lower horizontal header 9 and the vertical air return header 10.

The oil return elbow 14 comprises two 45-degree elbow pipes 141 and a 90-degree elbow pipe 142, the 90-degree elbow pipe 142 is connected with the two 45-degree elbow pipes 141, and one ends, far away from the 90-degree elbow pipe 142, of the two 45-degree elbow pipes 141 are respectively connected with the lower horizontal header pipe 9 and the vertical air return header pipe 10, so that the lower accumulated liquid of the oil return elbow 14 is less, the resistance is small, and the oil return elbow 14 can also play a role.

In order to make the hot air sucked by the fan further gasify the refrigerant liquid in the return pipe to ensure that the refrigerant entering the compressor from the horizontal air return main pipe 11 is superheated gas, the side of the fin evaporator opposite to the vertical air return main pipe 10 is provided with an air suction fan 15.

The U-shaped heat exchange tube 8 is connected to the top of the lower horizontal header 9 and has the function of facilitating the oil film in the vertical header 6 and the U-shaped heat exchange tube 8 of the evaporator to smoothly flow into the lower horizontal header 9.

The horizontal air return main pipe 11 is provided with a temperature sensing bulb 21 and an outer balance connecting pipe 22, and the temperature sensing bulb 21 and the outer balance connecting pipe 22 are connected with the expansion valve 2. The temperature sensing bulb 21 is filled with refrigerant in a gas-liquid equilibrium saturated state, the refrigerant is not communicated with the refrigerant in the system, the temperature sensing bulb 21 is tied on the horizontal air return main pipe 11 of the finned evaporator and is in close contact with the horizontal air return main pipe 11 to sense the temperature of superheated steam at the outlet of the finned evaporator, and the refrigerant in the temperature sensing bulb is saturated, so that the pressure in the saturated state at the temperature is transferred to the valve body of the expansion valve 2 according to the temperature. One end of the balance pipe is connected with the position of the outlet of the evaporator, which is slightly far away from the thermal bulb 21, and is directly connected with the valve body of the expansion valve 2 through a capillary tube, so that the actual pressure of the outlet of the evaporator is transferred to the valve body, two diaphragms are arranged in the valve body, the diaphragms move upwards under the action of pressure to reduce the flow of the refrigerant passing through the expansion valve 2, and the balance is sought in the dynamic state.

To sum up, the utility model discloses fully guaranteed the superheat degree under the prerequisite that does not influence refrigeration effect, solved the frozen problem of finned evaporator lower part simultaneously, provide reliable assurance to finned evaporator steam defrosting.

The present application has been described in connection with only the presently preferred embodiments with the understanding that the present disclosure is not to be considered as limiting, and the present application is not limited to the examples described above, but rather, it is to be understood that changes, modifications, additions or substitutions that are within the spirit and scope of the application by one of ordinary skill in the art are included.

Claims

1. The fin evaporator is characterized by comprising a liquid supply pipe (1), an expansion valve (2) arranged on the liquid supply pipe (1), a liquid distribution head (3), a liquid distribution pipe (4), a heat exchange assembly (5), a vertical collecting pipe (6), an upper horizontal collecting pipe (7), a U-shaped heat exchange pipe (8), a lower horizontal collecting pipe (9), a vertical air return header pipe (10) and a horizontal air return header pipe (11) which are sequentially connected with the liquid supply pipe (1) in series, an air outlet branch pipe (12) is arranged between the expansion valve (2) and the liquid distribution head (3), and an air inlet branch pipe (13) is arranged on the horizontal air return header pipe (11).

2. A finned evaporator according to claim 1 characterized in that the heat exchange assembly (5) comprises a number of heat exchange tubes (51), fins expanded on the heat exchange, U-shaped tubes (52) connecting the heat exchange tubes, the vertical headers (6) connecting the heat exchange tubes (51).

3. A finned evaporator according to claim 1, characterized in that the U-shaped heat exchange tube (8) comprises two heat exchange tubes (51) and a U-shaped tube (52), the U-shaped tube (52) connecting the two heat exchange tubes (51).

4. The finned evaporator according to claim 2, wherein the material of the fins is aluminum foil.

5. A finned evaporator according to claim 1, characterized in that the lower horizontal header (9) and vertical return manifold (10) junction is provided with return oil bends (14).

6. A finned evaporator according to claim 5, characterized in that the return bend (14) comprises two 45 ° bends (141) and one 90 ° bend (142), the 90 ° bend (142) connecting the two 45 ° bends (141), the ends of the two 45 ° bends (141) remote from the 90 ° bend (142) connecting the lower horizontal header (9) and the vertical return manifold (10), respectively.

7. Fin evaporator according to claim 1, characterised in that a suction fan (15) is arranged on the side of the fin evaporator opposite the vertical return air manifold (10).

8. A finned evaporator according to claim 1, characterized in that the U-shaped heat exchange tubes (8) are connected to the top of a lower horizontal header (9).

9. Fin evaporator according to claim 1, characterised in that a bulb (21) is arranged on the horizontal return air manifold (11), the bulb (21) being connected to the expansion valve (2).

10. Fin evaporator according to claim 1, characterised in that an outer balancing connection (22) is arranged on the horizontal return air manifold (11), which outer balancing connection (22) is connected to the expansion valve (2).