Finned heat exchanger

Abstract

The present invention discloses a finned heat exchanger, wherein a suction fan is arranged on one side of a housing, and an air inlet is arranged on the other side opposite thereto. At least one group of refrigeration pipe groups is arranged inside the housing, and a refrigerant inlet pipe and a first discharge pipe are arranged in communication with each group of refrigeration pipe groups; one end of the first discharge pipe is connected to a drying filter of a refrigeration system, and the other end is connected to a second discharge pipe through a detour pipe. The present invention arranges a second discharge pipe on the first discharge pipe through a detour pipe, and returns a part of the liquid refrigerant in the first discharge pipe to the air inlet of the housing through the detour pipe for secondary heat exchange with cold air. When the power and volume of the finned heat exchanger are small, the heat exchange path of the refrigerant is further extended through the detour pipe returning to the air inlet, thereby obtaining a larger heat exchange area and higher heat exchange efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of heat exchangers, in particular to a finned heat exchanger used in an environmental test box. Background Art

[0002] Finned heat exchanger is the most widely used heat exchange equipment in gas and liquid heat exchangers. It is mainly used for air heating in drying systems and is the main equipment in hot air devices. It achieves the purpose of enhancing heat transfer by adding fins to ordinary base tubes.

[0003] like Figure 1 The figure shows a finned heat exchanger used in an environmental test chamber. A suction fan 2 is arranged on the rear side of the housing 1. A refrigeration tube group 3 is arranged inside the housing 1. The refrigeration tube group 3 is provided with copper tubes that are arranged in parallel and spaced and interconnected. A plurality of fins are arranged radially on the outer periphery of the copper tubes. The gaseous refrigerant enters the refrigeration tube group 3 from the refrigerant inlet pipe 31. The suction fan 2 sucks in cold air. The cold air flows through the gap of the refrigeration tube group 3 and exchanges heat with the refrigerant in the refrigeration tube group 3. The refrigerant is condensed into a liquid refrigerant and discharged from the refrigerant discharge pipe 32. Environmental test chambers are generally used indoors. There are many devices placed inside the test chamber, and the ambient temperature of the test chamber is relatively high. However, the space inside the test chamber is usually small, so the power and floor space of the equipment should not be too large. That is, the power and volume of the finned heat exchanger placed in the environmental test chamber are small, which makes the heat exchange efficiency of the finned heat exchanger relatively low and the heat exchange area small. Summary of the invention

[0004] In view of the shortcomings of the existing fin heat exchangers used in environmental test chambers, such as relatively low heat exchange efficiency and small heat exchange area, the applicant provides a fin heat exchanger with a reasonable structure, which has high heat exchange efficiency and large heat exchange area while having small power and volume.

[0005] The technical solution adopted by the present invention is as follows:

[0006] A fin heat exchanger, a suction fan is arranged on one side of a cover shell, and the other opposite side is an air suction port, at least one group of refrigeration pipe groups is arranged in the cover shell, and a refrigerant inlet pipe and a first discharge pipe are respectively arranged in communication with each group of refrigeration pipe groups; one end of the first discharge pipe is connected to a drying filter of the refrigeration system, and the other end is connected to a second discharge pipe through a detour pipe; the detour pipe is an internally connected detour channel, including a plurality of second straight pipes parallel to each other and spaced a certain distance apart, and second connecting elbows connected to the ends of adjacent second straight pipes, a plurality of second straight pipes are vertically passed through and arranged on two opposite side surfaces of the cover shell, a second straight pipe at the lower end passes through the end of the cover shell to be connected to the first discharge pipe, and a second straight pipe at the upper end passes through the end of the cover shell to be connected to the second discharge pipe.

[0007] As a further improvement of the above technical solution:

[0008] The detour pipe is arranged at a position close to the front air inlet of the cover shell.

[0009] The bypass pipe is located in front of each group of refrigeration pipe groups.

[0010] The invention arranges a second discharge pipe on the first discharge pipe through a detour pipe, and returns a part of the liquid refrigerant in the first discharge pipe to the air intake port of the cover shell through the detour pipe for secondary heat exchange with the cold air. When the power and volume of the fin-type heat exchanger are small, the heat exchange path of the refrigerant is further extended by the detour pipe returning to the air intake port, so as to obtain a larger heat exchange area and higher heat exchange efficiency. Moreover, since the cold air just inhaled at the air intake port of the cover shell has not yet started to contact the heat exchange, the temperature of the cold air here is the lowest. The detour pipe is arranged at a position close to the front air intake port of the cover shell and in front of each group of refrigeration pipe groups. The heat exchange effect of the refrigerant returning through the detour pipe for secondary heat exchange is more obvious, and the temperature of the refrigerant obtained after the secondary heat exchange is lower, which is more conducive to improving the heat exchange efficiency.

[0011] The second discharge pipe is arranged on the same side as the first discharge pipe and is located above the first discharge pipe.

[0012] Each refrigeration pipe group is an internally connected circuitous channel, including a plurality of first straight pipes parallel to each other and spaced a certain distance apart, and first connecting elbows connected to the ends of adjacent first straight pipes.

[0013] A plurality of first straight tubes of each refrigeration tube group are vertically passed through and arranged on two opposite side surfaces of the cover shell.

[0014] The end of the first straight tube at the top of each refrigeration tube group passes through the cover shell and is connected to the refrigerant inlet pipe, and the end of the first straight tube at the bottom of each refrigeration tube group passes through the cover shell and is connected to the first discharge pipe.

[0015] The first straight tubes of each refrigeration tube group are divided into two rows and arranged in an array in a staggered manner.

[0016] The first straight tubes of each refrigeration tube group of the present invention are arranged in two rows in an alternating manner, which fully utilizes the vertical plane size and the space size between the two rows, so that the detour channel has a longer detour path, the heat exchange area between the detour channel and the cold air is larger, and the heat exchange efficiency is higher.

[0017] A plurality of first connecting elbows are arranged parallel to each other and obliquely on the outer sides of two opposite side surfaces of the cover shell.

[0018] The plurality of second straight tubes of the detour tube are parallel to the first straight tubes of the refrigeration tube group.

[0019] The beneficial effects of the present invention are as follows:

[0020] The present invention arranges a second discharge pipe on the first discharge pipe through a detour pipe, and returns a part of the liquid refrigerant in the first discharge pipe to the air intake port of the cover shell through the detour pipe for secondary heat exchange with the cold air. When the power and volume of the fin-type heat exchanger are small, the heat exchange path of the refrigerant is further extended by the detour pipe returning to the air intake port, so as to obtain a larger heat exchange area and higher heat exchange efficiency. Moreover, since the cold air just inhaled at the air intake port of the cover shell has not yet started to contact the heat exchange, the temperature of the cold air here is the lowest. The detour pipe is arranged at a position close to the front air intake port of the cover shell and in front of each group of refrigeration pipe groups. The heat exchange effect of the refrigerant returning through the detour pipe for secondary heat exchange is more obvious, and the temperature of the refrigerant obtained after the secondary heat exchange is lower, which is more conducive to improving the heat exchange efficiency.

[0021] The first straight tubes of each refrigeration tube group of the present invention are arranged in two rows in an alternating manner, which fully utilizes the vertical plane size and the space size between the two rows, so that the detour channel has a longer detour path, the heat exchange area between the detour channel and the cold air is larger, and the heat exchange efficiency is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three-dimensional diagram of an existing fin heat exchanger.

[0023] Figure 2 It is a stereogram of the present invention.

[0024] Figure 3 for Figure 2 Front view of.

[0025] Figure 4 for Figure 2 Right view of the figure, in which the arrow indicates the direction of the cold wind.

[0026] Figure 5 for Figure 2 Left view of .

[0027] In the figure: 1, cover; 2, suction fan; 3, refrigeration pipe group; 31, refrigerant inlet pipe; 32, refrigerant discharge pipe; 33, first discharge pipe; 34, second discharge pipe; 35, first straight pipe; 36, first connecting elbow; 4, detour pipe; 41, second straight pipe; 42, second connecting elbow. DETAILED DESCRIPTION

[0028] The specific implementation of the present invention is described below in conjunction with the accompanying drawings.

[0029] like Figure 2As shown, the front and rear sides of the square cover 1 of the present invention are open surfaces, and the left, right, upper and lower sides are closed surfaces. The front open surface of the cover 1 is the air suction port, and the rear side of the cover 1 is fixedly provided with a suction fan 2. When the suction fan 2 is turned on, cold air is sucked in from the front air suction port of the cover 1 and discharged from the rear side of the cover 1. Figure 2 , Figure 4 , Figure 5 As shown, at least one group of refrigeration pipe groups 3 are arranged in sequence from front to back inside the housing 1. In this embodiment, two groups of refrigeration pipe groups 3 are arranged in the housing 1 from front to back. A refrigerant inlet pipe 31 is arranged at the upper end of the outer side of the right side of the housing 1, and a first discharge pipe 33 is arranged at the lower end of the outer side of the right side. The refrigerant inlet pipe 31 and the first discharge pipe 33 are connected to each group of refrigeration pipe groups 3. Figure 3 As shown, each group of refrigeration pipe groups 3 is an internally connected circuitous channel, including a plurality of first straight pipes 35 parallel to each other and spaced a certain distance apart, and first connecting elbows 36 connected to the ends of adjacent first straight pipes 35. The plurality of first straight pipes 35 are divided into two rows, the array is staggered, and vertically passes through the left and right side surfaces of the housing 1. The plurality of first connecting elbows 36 are parallel to each other and obliquely arranged on the outside of the left and right side surfaces of the housing 1. The two ends of the first connecting elbows 36 are respectively connected to the ends of the first straight pipes 35 at the corresponding positions of the front and rear rows; each group of refrigeration pipes 3 is formed. The plurality of first straight tubes 35 of the cold pipe group 3 are arranged in an array in two rows in an alternating manner, which fully utilizes the vertical plane dimensions and the space dimensions between the two rows, so that the detour channel has a longer detour path, the heat exchange area between the detour channel and the cold air is larger, and the heat exchange efficiency is higher; the first straight tube 35 at the top of each group of cold pipe groups 3 passes through the end of the right side of the cover shell 1 to connect to the refrigerant inlet pipe 31, and the first straight tube 35 at the bottom of each group of cold pipe groups 3 passes through the end of the right side of the cover shell 1 to connect to the first exhaust pipe 33.

[0030] like Figures 2 to 5As shown, one end of the first discharge pipe 33 is connected to the drying filter of the refrigeration system (not shown in the figure), and the other end is connected to the second discharge pipe 34 through the detour pipe 4. The second discharge pipe 34 is arranged on the same side as the first discharge pipe 33, located above the first discharge pipe 33, and arranged in the lower middle part of the outer side of the right side surface of the cover shell 1. The detour pipe 4 is arranged at a position close to the front air intake port of the cover shell 1 and in front of each group of refrigeration pipe groups 3; the detour pipe 4 is an internally connected detour channel, including a plurality of second straight pipes 41 parallel to each other and spaced a certain distance apart and second connecting elbows 42 connected to the ends of adjacent second straight pipes 41, a plurality of second straight pipes 41 are parallel to and vertically passed through the first straight pipes 35 of the refrigeration pipe group 3 and arranged on the left and right side surfaces of the cover shell 1, and the ends of adjacent second straight pipes 41 are connected by second connecting elbows 42; a second straight pipe 41 at the lower end of the detour pipe 4 passes through the end of the right side surface of the cover shell 1 to be connected to the first discharge pipe 33, and a second straight pipe 41 at the upper end of the detour pipe 4 passes through the end of the right side surface of the cover shell 1 to be connected to the second discharge pipe 34; a first discharge pipe 33 The partially condensed liquid refrigerant returns to the air intake of the shell 1 through the bypass pipe 4, undergoes secondary heat exchange with the cold air, and is then discharged from the second discharge pipe 34. When the fin-type heat exchanger has a low power and a small volume, the heat exchange path of the refrigerant is further extended by returning the bypass pipe 4 to the air intake, thereby obtaining a larger heat exchange area and a higher heat exchange efficiency. Moreover, since the cold air just inhaled at the air intake of the shell 1 has not yet started to exchange heat, the temperature of the cold air here is the lowest. The bypass pipe 4 is arranged at a position close to the front air intake of the shell 1 and in front of each group of refrigeration pipe groups 3. The heat exchange effect of the refrigerant returning through the bypass pipe 4 for secondary heat exchange is more obvious, and the temperature of the refrigerant obtained after the secondary heat exchange is lower, which is more conducive to improving the heat exchange efficiency.

[0031] When the present invention is actually used, the suction fan 2 is turned on to suck cold air from the front air intake port of the cover shell 1; the gaseous refrigerant enters each group of refrigeration pipe groups 3 from the refrigerant inlet pipe 31, and flows in a circuitous way in each group of refrigeration pipe groups 3; the cold air sucked by the suction fan 2 flows through the gaps between each group of refrigeration pipe groups 3, and exchanges heat with the refrigerant in the refrigeration pipe groups 3. After the heat exchange, the gaseous refrigerant is condensed into a liquid refrigerant and flows to the first discharge pipe 33. The liquid refrigerant in the first discharge pipe 33: a part is discharged through the first discharge pipe 33, and the other part returns to the suction port of the cover shell 1 through the circuitous pipe 4, exchanges heat with the cold air for the second time, and is discharged from the second discharge pipe 34.

[0032] The present invention arranges a second discharge pipe 34 on the first discharge pipe 33 via a detour pipe 4, and returns a portion of the liquid refrigerant in the first discharge pipe 33 to the air intake port of the cover 1 through the detour pipe 4 for secondary heat exchange with the cold air, thereby extending the heat exchange path and increasing the heat exchange area. With relatively low power and volume, the invention has relatively high heat exchange efficiency and relatively large heat exchange area.

[0033] The above description is an explanation of the present invention, not a limitation of the present invention. The present invention may be modified in any form without violating the spirit of the present invention.

Claims

1. A finned heat exchanger, wherein a suction fan (2) is arranged on one side of a housing (1), and the other side opposite thereto is an air suction port, at least one group of refrigeration pipe groups (3) is arranged inside the housing (1), and a refrigerant inlet pipe (31) and a first discharge pipe (33) are respectively arranged in communication with each group of refrigeration pipe groups (3); the characteristics are as follows: One end of the first discharge pipe (33) is connected to a drying filter of the refrigeration system, and the other end is connected to a second discharge pipe (34) via a detour pipe (4); the detour pipe (4) is an internally connected detour passage, comprising a plurality of second straight pipes (41) parallel to each other and spaced a certain distance apart, and second connecting elbows (42) connected to the ends of adjacent second straight pipes (41); the plurality of second straight pipes (41) are vertically passed through opposite side surfaces of the housing (1), and the lowermost second straight pipe (41) passes through the end of the housing (1) and is connected to the first discharge pipe (34). The refrigerant (33) is a refrigerant having a first end and a second end. The second end of the refrigerant (33) is a refrigerant having a first end and a second end. The refrigerant (33) is a refrigerant having a first end and a second end. The refrigerant (33) is a refrigerant having a first end and a second end. The refrigerant (33) is a refrigerant having a first end and a second end. The refrigerant (33) is a refrigerant having a first end and a second end. The refrigerant (33) is a refrigerant having a first end and a second end. The refrigerant (33) is a refrigerant having a first end and a second end. The refrigerant (33) is a refrigerant having a first end and a second end. The refrigerant (33) is a refrigerant having a first end and a second end. The refrigerant (33) is a refrigerant having a first end and a second end.

2. The finned heat exchanger according to claim 1, characterized in that: The second discharge pipe (34) is arranged on the same side as the first discharge pipe (33) and is located above the first discharge pipe (33).

3. The finned heat exchanger according to claim 1, characterized in that: Each refrigeration tube group (3) is an internally connected circuitous channel, comprising a plurality of first straight tubes (35) which are parallel to each other and spaced a certain distance apart, and first connecting elbows (36) connected to the ends of adjacent first straight tubes (35).

4. The finned heat exchanger according to claim 3, characterized in that: A plurality of first straight tubes (35) of each refrigeration tube group (3) are vertically passed through and arranged on two opposite side surfaces of the cover shell (1).

5. The finned heat exchanger according to claim 3, characterized in that: The first straight tube (35) at the top of each refrigeration tube group (3) passes through the end of the cover shell (1) to connect to the refrigerant inlet tube (31), and the first straight tube (35) at the bottom of each refrigeration tube group (3) passes through the end of the cover shell (1) to connect to the first discharge tube (33).

6. The finned heat exchanger according to claim 3, characterized in that: The plurality of first straight tubes (35) of each refrigeration tube group (3) are divided into two rows and arranged in an array in a staggered manner.

7. The finned heat exchanger according to claim 3, characterized in that: A plurality of first connecting elbows (36) are arranged parallel to each other and obliquely on the outsides of two opposite side surfaces of the cover shell (1).

8. The finned heat exchanger according to claim 1, characterized in that: The plurality of second straight tubes (41) of the detour tube (4) are parallel to the first straight tubes (35) of the refrigeration tube group (3).

Images