WO2020125008A1

WO2020125008A1 - Heat exchange structure for compressed air refrigerated dryer

Info

Publication number: WO2020125008A1
Application number: PCT/CN2019/096760
Authority: WO
Inventors: 廖志远
Original assignee: 佛山市天地元一净化设备有限公司
Priority date: 2018-12-20
Filing date: 2019-07-19
Publication date: 2020-06-25
Also published as: CN109595952A; CN211120739U; CN110375563A

Abstract

Disclosed is a heat exchange structure for a compressed air refrigerated dryer, the structure comprising a vertically arranged first pipe (1), and further comprising a second pipe (2) arranged in an inner cavity of the first pipe (1), and a third pipe (3) arranged in an inner cavity of the second pipe (2), wherein a first cavity (4) is formed between the first pipe (1) and the second pipe (2), a second cavity (5) is formed between the second pipe (2) and the third pipe (3), a third cavity (6) is formed in an inner cavity of the third pipe (3), upper and lower portions of the second cavity (5) are respectively provided with a refrigerant outlet (7) and a refrigerant inlet (8), a plurality of heat exchange pipes (9) are arranged in the third cavity (6), an end of each of the plurality of first heat exchange pipes (9) is in communication with the outside, and the other end thereof is in communication with the first cavity (4), and the third cavity (6) and the first cavity (4) are in communication by means of a second heat exchange pipe (11).

Description

Heat exchange structure of compressed air freeze dryer Technical field

[0001] The present invention relates to the technical field of heat exchangers, and particularly refers to a structure for heat exchange of a compressed air refrigeration dryer.

Background technique

[0002] The heat exchange structure of some compressed air dryers mainly includes the following categories: The first type, the structure of the heat exchange of the refrigeration dryer, as shown in FIG. 3, la-cold heat exchanger, 2a-evaporation 3a-gas-liquid separator separate barrel, the structure is complicated, the manufacture is complicated, the volume is huge, the evaporator adopts copper aluminum fin type or stainless steel fin type heat exchanger, the fin gap is small, the condensate is in the evaporator It is easy to freeze in the middle, causing ice blockage. The second category, plate or plate fin type cold and dry heat exchanger, as shown in Figure 4, this heat exchange structure has the following problems: 1, cold and heat exchange and evaporator using aluminum plate fin heat exchanger or stainless steel For plate heat exchangers, the welds are easy to leak and cannot be repaired; 2. The thin plates are also easy to corrode and perforate and cannot be repaired; 3. The steam-water separation effect is not good due to the small size; if an external steam-water separator is installed, it cannot reach To achieve the effect of compact structure; 4. The gap between the plates is small, and it is easy to be blocked by dirt. Accumulating more dirt will affect the heat exchange effect, and the resistance increases, resulting in an increasing pressure difference between the inlet and outlet of compressed air, and Condensation water easily freezes in the evaporator and blocks the compressed air channel, causing ice blockage. 5. The production is complicated. Only professional plate or plate fin heat exchanger manufacturers can make it, and the cost is high. The third category, the cold heat exchanger and the evaporator built in a barrel of the dryer, as shown in Figure 5, in the figure: a-refrigerant inlet, b-refrigerant outlet, h-air inlet, i-air Outlet, g-spiral tube, e-filtrate mesh, f-evaporator, evaporator adopts copper-aluminum fin type or stainless steel fin type heat exchanger, this structure has the following problems: 1) small fin gap, condensate It is easy to freeze in the evaporator, resulting in ice blocking phenomenon; 2) There is no special gas-liquid separation device, but rely on natural gravity water analysis, moisture is easily taken away by the airflow, and the effect of gas-water separation is not good; 3) Precision of production The requirements are higher, the manufacturing process is complicated, and the cost is high.

[0003] In summary, the heat exchange structure of some compressed air dryers is not ideal.

Summary of the invention

technical problem

Solution to the problem Technical solution

[0004] In view of the above problems, the present invention provides a compressed air refrigeration dryer heat exchange structure, compact structure, anti-corrosion does not produce secondary pollution, small pressure loss, reduce ice blocking and leakage, simple process, low cost , Good water vapor separation effect.

[0005] In order to achieve the above objective, the technical solution adopted by the present invention is as follows:

[0006] A heat exchange structure of a compressed air refrigeration dryer is characterized in that it includes a vertically arranged first tube

, A second tube provided in the lumen of the first tube and a third tube provided in the lumen of the second tube, a first cavity is formed between the first tube and the second tube, the second tube and the A second cavity is formed in the third tube, a third cavity is formed in the third tube, and the first cavity, the second cavity, and the third cavity are not in communication with each other, and the second cavity The upper and lower parts are respectively provided with a refrigerant outlet and a refrigerant inlet. A plurality of first heat exchange tubes are provided in the third cavity. One end of the plurality of first heat exchange tubes is connected to the outside world, and the other end is connected to the The first cavity, an air inlet is opened in the third tube and communicated with the third cavity, and the third cavity and the first cavity are communicated through a second heat exchange tube, the One end of the second heat exchange tube is connected to the lower part of the third cavity, the other end is connected to the upper part of the first cavity, and a drain tube is provided at the bottom of the first tube.

[0007] Preferably, the second heat exchange tube is provided in the second cavity.

[0008] Preferably, the second heat exchange tube is provided in the third cavity.

[0009] Preferably, the outer wall of the second tube is provided with a spiral piece.

[0010] Preferably, the bottom end of the first heat exchange tube is connected to the lower portion of the first cavity.

[0011] Preferably, the third cavity is provided with a plurality of baffles to disturb the gas, and a plurality of the baffles are fixed on the first heat exchange tube.

[0012] Preferably, the first tube, the second tube, the third tube and the second heat exchange tube are all 304 stainless steel structure.

[0013] Preferably, a plurality of first heat exchange tubes are evenly distributed in the third cavity.

[0014] Preferably, both ends of the second tube are placed in the first tube, the top end of the third tube extends out of the first tube, the bottom end is located in the first tube, the upper part of the third tube For sealing, the air inlet is provided on the side of the third tube and below the sealing of the third tube, and the top of the first heat exchange tube protrudes from the sealing at the upper part of the third tube and communicates with the outside world.

Beneficial effects of invention

Beneficial effect [0015] The beneficial effects of the present invention:

[0016] a) Anti-corrosion: All components are made of 304 stainless steel or above anti-corrosion material, which is not easy to corrode and produce secondary pollution.

[0017] b) Compressed air inlet and outlet pressure difference is small: the compressed air flow process has a relatively large cross-sectional area and is not easily blocked by dirt, compressed air inlet and outlet pressure difference is small.

[0018] c) Simple procurement: all materials are widely used in the market (including stainless steel heat exchange tubes), simple procurement.

[0019] d) Reduce ice blocking phenomenon: The second cavity uses a stainless steel heat exchange tube with an inner diameter greater than 10mm, which is much larger than the 2-3mm gap of the fin, plate or plate fin heat exchanger, greatly reducing ice Blocking phenomenon.

[0020] e) Leak reduction: the second heat exchange tube adopts a stainless steel heat exchange tube with a thickness greater than 1 mm, the first tube and the second tube use stainless steel tubes with a thickness greater than 3 mm, and the upper and lower end plates use a stainless steel material with a thickness greater than 5 mm. Compared with fin, plate fin and plate heat exchangers, argon arc welding has thicker heat exchange materials and fewer welding points, which greatly reduces the risk of corrosion leakage and welding point leakage.

[0021] The gas-liquid separation effect is better: The device is installed vertically, and the compressed air is better under the action of rotation separation and gravity.

[0022] g) The production process is simple: all adopt a simple welding process, no special production equipment is required, and the production is simple.

[0023] h) Compact structure: composed of the first tube, the second tube and the third tube from the outside to the inside, there is no invalid area, and the structure is compact.

Brief description of the drawings

BRIEF DESCRIPTION

[0024] FIG. 1 is a schematic structural view of Embodiment 1;

[0025] FIG. 2 is a schematic structural view of Example 2;

[0026] FIG. 3 is a schematic structural view of the heat exchange of the freeze dryer;

[0027] FIG. 4 is a schematic structural view of a plate or plate fin type cold and dry heat exchanger;

[0028] FIG. 5 is a schematic structural view of a cold and dry machine in which a cold heat exchanger and an evaporator are built in one barrel.

The best embodiment of the invention

Best Mode of the Invention

[0029] The technical solution of the present invention will be described below in conjunction with the accompanying drawings and embodiments.

[0030] Embodiment 1: As shown in FIG. 1, a heat exchange structure of a compressed air freeze dryer, including a vertical arrangement The first tube 1 further includes a second tube 2 disposed in the cavity of the first tube 1 and a third tube 3 disposed in the cavity of the second tube 2, the first tube 1, the second tube 2 and the third The tubes 3 are preferably arranged coaxially and fixed to each other, a first cavity 4 is formed between the inner wall of the first tube 1 and the outer wall of the second tube 2, the inner wall of the second tube 2 and the third tube 3 A second cavity 5 is formed between the outer walls, a third cavity 6 is formed in the inner cavity of the third tube 3, and both ends of the first tube 1, the second tube 2, and the third tube 3 are sealed so that the first cavity The cavity 4, the second cavity 5 and the third cavity 6 are not in communication with each other. The upper and lower parts of the second cavity 5 are provided with a refrigerant outlet 7 and a refrigerant inlet 8 respectively. The inlet 8 enters, fills the second cavity 5, and then exits from the refrigerant outlet 7. The third cavity 6 is provided with a plurality of first heat exchange tubes 9, the plurality of first heat exchange tubes 9 are evenly distributed in the third cavity 6, and both ends of the second tube 2 are placed In the first tube 1, the upper part of the third tube 3 is sealed, and the top end of the third tube 3 extends out of the first tube 1 and is opened to form an air outlet 15, where a flange can be provided to facilitate connection with other In the pipeline, an air inlet 10 is opened on the side of the third tube 3 and communicates with the third cavity 6, the air inlet 10 is located below the upper seal of the third tube 3, and the top of the first heat exchange tube 9 A seal extending above the third tube 3 and communicating with the outside world, the first heat exchange tube 9 is not higher than the air outlet 15, so that a unified air outlet is formed, and the other end of the first heat exchange tube 9 Communicating with the lower part of the first cavity 4, the third cavity 6 and the first cavity 4 are communicated by a second heat exchange tube 11, the second heat exchange tube 11 is provided at the second In the cavity 5, one end of the second heat exchange tube 11 is connected to the lower part of the third cavity 6, the other end is connected to the upper part of the first cavity 4, the first tube 1, the second tube 2, the third Both the tube 3 and the second heat exchange tube 11 are of a 3 04 stainless steel structure, and the second heat exchange tube 11 is a stainless steel heat exchange tube, and its inner diameter is greater than 10 mm, which can reduce the risk of ice blockage. Because the bottom end of the second tube 2 is inside the first tube 1, a water collecting groove 16 is formed at the bottom of the inner cavity of the first tube 1, the water collecting groove 16 communicates with the first cavity 4, the outer wall of the second tube 2 A spiral piece 13 is provided, and a drain pipe 12 is provided at the bottom of the first pipe 1.

[0031] Specifically, the second heat exchange tube 4 uses a stainless steel heat exchange tube with a thickness greater than 1 mm, both the first tube 1 and the second tube 2 use a stainless steel tube with a thickness greater than 3 mm, and the upper and lower end plates use a stainless steel material with a thickness greater than 5 mm , Argon arc welding, less solder joints, high strength, not easy to leak.

[0032] Specifically, the third cavity 6 is provided with a plurality of baffles 14 to cause turbulence of gas, and the plurality of baffles 14 are fixed on the first heat exchange tube 9 and can be fixed by welding In this way, after the compressed air enters the third cavity 6 from the air inlet 10, turbulence will be generated, so that the compressed air will move around in the third cavity 6 to improve the heat exchange efficiency. [0033] During the operation of the present invention, after compressed air enters the third cavity 6 from the air inlet 10, the turbulence of the gas is caused by the baffle plate 14 in the third cavity 6 and the cooling in the second cavity 5 Heat exchange between the agent and the low-temperature air in the first heat exchange tube 9, and the temperature of the compressed air gradually decreases. When the compressed air reaches the lower part of the third cavity 6, it enters the second heat exchange tube 11, In the second heat exchange tube 11, heat exchange with the refrigerant in the second cavity 5 and then enter the upper part of the first cavity 4, under the action of the spiral sheet 13 of the first cavity 4, the compressed air Spiral descending, the compressed air comes into contact with the outer surface of the second tube 2 and is cooled by the low-temperature refrigerant inside the second tube 2, the temperature continues to decrease, and a large amount of liquid water is produced. At the same time, the compressed air generates a centrifugal force during the high-speed rotation and downward flow. Under the double action of centrifugal force and gravity, liquid water and gas are separated, liquid water enters the lower sump 16, and compressed air enters the tube from the bottom of the first heat exchange tube 9, when compressed air is discharged outside, it is separated from the third The compressed air in the cavity 6 performs heat exchange, and after the temperature rises, it is discharged through the air outlet 15 to finish drying the compressed air.

[0034] The present invention has the following advantages:

[0035] a) Anti-corrosion: All components are made of 304 stainless steel or above anti-corrosion material, which is not easy to corrode and produce secondary pollution.

[0036] b) Compressed air inlet and outlet pressure difference is small: the compressed air flow process has a relatively large cross-sectional area and is not easily blocked by dirt, compressed air inlet and outlet pressure difference is small.

[0037] c) simple procurement: all materials are widely used in the market (including stainless steel heat exchange tubes), simple procurement.

Claims

[Claim 1] A structure for heat exchange of a compressed air freeze dryer, characterized in that it includes a first tube arranged vertically, a second tube arranged in the inner cavity of the first tube, and a second tube arranged in the second tube A third tube in the inner cavity of the tube, a first cavity is formed between the first tube and the second tube, a second cavity is formed between the second tube and the third tube, and the third tube inner cavity is formed A third cavity, where the first cavity, the second cavity and the third cavity are not in communication with each other, the upper and lower parts of the second cavity are respectively provided with a refrigerant outlet and a refrigerant inlet, A plurality of first heat exchange tubes are provided in the third cavity, one end of the plurality of first heat exchange tubes communicates with the outside world, the other end communicates with the first cavity, and the third tube has an air inlet And communicate with the third cavity, the third cavity and the first cavity are communicated by a second heat exchange tube, one end of the second heat exchange tube is connected to the lower part of the third cavity, and One end is connected to the upper part of the first cavity, and a drain pipe is provided at the bottom of the first pipe.

[Claim 2] The heat exchange structure of a compressed air refrigeration dryer according to claim 1, characterized in that the second heat exchange tube is provided in the second cavity.

[Claim 3] The heat exchange structure of a compressed air freeze dryer according to claim 1, characterized in that the second heat exchange tube is provided in a third cavity.

[Claim 4] A heat exchange structure for a compressed air freeze dryer according to claim 2 or 3, characterized in that: the outer wall of the second tube is provided with a spiral piece.

[Claim 5] A heat exchange structure for a compressed air freeze dryer according to claim 2 or 3, characterized in that: the bottom end of the first heat exchange tube is connected to the lower part of the first cavity.

[Claim 6] A structure for heat exchange of a compressed air freeze dryer according to claim 2 or 3, characterized in that: the third cavity is provided with a plurality of baffles to cause turbulence of gas, A plurality of the baffle plates are fixed on the first heat exchange tube.

[Claim 7] The heat exchange structure of a compressed air freeze dryer according to claim 2 or 3, characterized in that the first tube, the second tube, the third tube and the second heat exchange tube All are 304 stainless steel structure.

[Claim 8] A heat exchange structure for a compressed air freeze dryer according to claim 2 or 3, characterized in that a plurality of first heat exchange tubes are evenly distributed in the third cavity. [Claim 9] A structure for heat exchange of a compressed air freeze dryer according to claim 2 or 3, characterized in that: both ends of the second tube are placed in the first tube, the first The top end of the three tubes extends out of the first tube, the bottom end is located in the first tube, the upper part of the third tube is sealed, the air inlet is provided on the side of the third tube and is located below the sealing of the third tube The top of the first heat exchange tube protrudes from the upper seal of the third tube and communicates with the outside world.