Dry-type evaporator

Abstract

The utility model discloses a dry-type evaporator which is provided with a baffle plate assembly, so that water flowing in from a shell pass water inlet sequentially flows through a first baffling area, a first baffling notch, a second baffling area, a second baffling notch, a third baffling area, a third baffling notch and a fourth baffling area, and then enters a spiral channel in a spiral baffle plate assembly; the structure optimizes the path of water flowing near the tube plate, increases the flow rate of water flowing through the inner surface of the tube plate, avoids the problem of low-temperature freezing of the area near the inner surface of the tube plate, effectively avoids the conditions of bulging and frost cracking of the heat exchange tube in the area, enhances the use reliability of the dry evaporator, and improves the service life of the dry evaporator. Meanwhile, the heat exchange tubes in the area nearby the tube plate can fully participate in heat exchange, the heat exchange efficiency of the area nearby the tube plate is improved, and the performance of the evaporator and the unit is optimized.

Description

Technical Field

[0001] The utility model belongs to the technical field of central air conditioning, and particularly relates to a dry evaporator in refrigeration unit equipment. Background Art

[0002] In dry evaporators, the shell baffle is usually set between the water inlet and outlet, and there is no baffle in the water area between the tube sheet and the nearest baffle. When the refrigeration unit is in refrigeration condition, the inlet / outlet temperature is 12℃ / 7℃. When the unit is in partial load operation, it will be frequently started under the automatic control of the system. This frequent startup will lead to frequent evaporation temperature <-5℃. This problem occurs more frequently during the transition between spring and summer.

[0003] When the water near the connection between the tube sheet on the shell side of the dry evaporator and the heat exchange tube near the liquid pipe on the refrigerant side is subjected to low temperature impact, ice or ice crystals will appear. This local low temperature will cause the root of the heat exchange tube to bulge, deform, freeze and crack, and even cause leakage, eventually causing the shell side water to enter the refrigerant system in the heat exchange tube, damaging the compressor, causing the unit to fail and shut down, and reducing the reliability of the refrigeration unit.

[0004] In view of this drawback, technicians in this field need to consider how to prevent freezing at the connection between the tube sheet and the heat exchange tube of the dry evaporator and how to design a dry evaporator to avoid local low temperature at the root of the heat exchange tube by improving the heat exchange structure. These are urgent problems to be solved by technicians in this field. Utility Model Content

[0005] In order to overcome the shortcomings of the prior art, the utility model provides a dry evaporator, which uses a baffle assembly to interfere with the flow direction of the shell-side liquid, thereby avoiding stagnation of the liquid in the joint area of ​​the tube sheet and the heat exchange tube and causing low-temperature damage, thereby fundamentally solving the anti-freezing problem at the connection between the tube sheet and the heat exchange tube mentioned in the above background technology.

[0006] In order to achieve the above technical purpose, the utility model adopts the following scheme:

[0007] A dry evaporator comprises a pipe box, a flange, a cylinder, and an end cover connected together; a bracket is arranged at the bottom of the cylinder; the support and fixation of the device are realized by the bracket;

[0008] A baffle assembly is arranged inside the cylinder, and the baffle assembly includes a baffle assembly, a spiral baffle assembly and a tube sheet arranged inside the cylinder;

[0009] The baffle assembly includes a liquid baffle, a first baffle, a second baffle, and a third baffle arranged at intervals. The first baffle, the second baffle, and the third baffle are all provided with baffle notches. A passage for flowing into the spiral baffle assembly is formed by the liquid baffle, multiple baffles, and the baffle notches. The passage is connected to the spiral baffle assembly to form a spiral passage. The water inlet of the cylinder is located in the space surrounded by the liquid baffle and the first baffle in the baffle assembly. The water outlet of the cylinder is located at the end of the spiral baffle assembly. The spiral plate in the spiral baffle assembly is provided with fixing holes, and the connection and fixation of the U-shaped tube is achieved through the fixing holes.

[0010] The spiral baffle assembly includes a central tube, a first spiral baffle and a plurality of second spiral baffles; the first spiral baffle is arranged in a 90° fan-shaped structure, and the second spiral baffle is arranged in a 180° fan-shaped structure; the first spiral baffle and the second spiral baffle are fixed together.

[0011] The liquid baffle is located at the 0° position of the cylinder, the first baffle is located at the 90° position of the cylinder, and a first baffle notch is set on the side close to the tube sheet, the second baffle is located at the 180° position of the cylinder, and a second baffle notch is set on the side close to the second spiral baffle, and the third baffle is located at the 270° position of the cylinder, and a third baffle notch is set on the side close to the tube sheet.

[0012] The inner sides of the liquid baffle, the first baffle, the second baffle and the third baffle are all welded or glued to the central tube, and the outer sides are matched with the cylinder gap, and the preferred gap is 0-2mm; the left and right sides of the liquid baffle are respectively welded or glued to the tube sheet and the first spiral baffle; the right side of the first baffle is welded or glued to the first spiral baffle; the left side of the second baffle is welded or glued to the tube sheet; the right side of the third baffle is welded or glued to the second spiral baffle.

[0013] The liquid baffle, the first baffle, the second baffle and the third baffle are made of metal plates or plastic plates, with a preferred thickness of 1-5 mm.

[0014] The liquid baffle plate is provided with a drainage hole near the tube plate, and the drainage hole is a circular hole, and the diameter of the drainage hole is preferably less than or equal to 6 mm.

[0015] The cylinder is provided with a sewage outlet at the lowest point, through which the internal liquid sediment is removed.

[0016] The first baffle notch length L1, the second baffle notch length L2, and the third baffle notch length L3 are all smaller than the unit pitch L4 of the spiral baffle assembly; and L1=L2=L3.

[0017] The baffle assembly divides the area between the tube sheet in the cylinder and the spiral baffle assembly into four baffle zones. The first baffle zone is between the liquid baffle and the first baffle, the second baffle zone is between the first baffle and the second baffle, the third baffle zone is between the second baffle and the third baffle, and the fourth baffle zone is between the third baffle and the liquid baffle.

[0018] Through the above structural setting, compared with the prior art, the beneficial effects of the utility model are:

[0019] The utility model sets a baffle assembly so that water flowing in through the shell-side water inlet needs to flow through the first baffle area, the first baffle notch, the second baffle area, the second baffle notch, the third baffle area, the third baffle notch, and the fourth baffle area in sequence, and then enters the spiral channel in the spiral baffle assembly. This structure optimizes the path of water flowing through the vicinity of the tube sheet, increases the flow rate of water flowing through the inner surface of the tube sheet, avoids the problem of low-temperature freezing in the area near the inner surface of the tube sheet, effectively avoids bulging and freezing of the heat exchange tubes in this area, enhances the reliability of the dry evaporator, and at the same time enables the heat exchange tubes in the area near the tube sheet to more fully participate in the heat exchange, improves the heat exchange efficiency in the area near the tube sheet, and optimizes the performance of the evaporator and the unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the appearance structure of the utility model;

[0021] Figure 2 This is a schematic diagram of the internal cross-sectional structure of the utility model;

[0022] Figure 3 It is a schematic diagram of the three-dimensional structure of the baffle assembly;

[0023] Figure 4 It is a schematic diagram of the main structure of the baffle assembly;

[0024] Figure 5 It is a schematic diagram of the side structure of the baffle assembly;

[0025] Figure 6 for Figure 2 Schematic diagram of the structure in the middle A direction;

[0026] Figure 7 for Figure 2 Schematic diagram of the cross-sectional structure of the middle BB;

[0027] In the accompanying drawings, 1. tube box, 2. tube sheet, 21. first baffle area, 22. second baffle area, 23. third baffle area, 24. fourth baffle area, 3. flange, 4. liquid baffle plate, 41. drain outlet, 5. first baffle, 51. first baffle notch, 6. second baffle, 61. second baffle notch, 7. third baffle, 71. third baffle notch, 8. center tube, 9. first spiral baffle, 10. second spiral baffle, 11. support, 12. U-shaped heat exchange tube, 13. cylinder, 14. end cover, 15. water inlet, 16. water outlet, 17. drain outlet. DETAILED DESCRIPTION

[0028] The utility model is described in detail below through specific embodiments. People who are familiar with this technology can easily understand other advantages and functions of the utility model from the content disclosed in this specification; however, it should be pointed out that the following specific implementation methods do not technically limit the technical solution. Under the guidance of the following technical solution, those skilled in the art can also make further technical extensions. The scope of protection of this patent application shall be subject to the claims.

[0029] like Figure 1 A dry evaporator shown includes a tube box 1, a flange 3, a U-shaped heat exchange tube 12, a cylinder 13, an end cover 14 and a support 11. The tube box 1, the flange 3, the cylinder 13 and the end cover 14 are connected together by bolts. The U-shaped heat exchange tube 12 is provided in multiple pieces and fixed inside the cylinder 13. The utility model is provided with two supports 11, and the cylinder 13 is horizontally supported and fixed by the two supports 11.

[0030] The cylinder 13 is provided with a baffle assembly, which includes a baffle assembly, a spiral baffle assembly and a tube sheet 2 arranged in the cylinder 13. The tube sheet 2 is clamped between the tube box 1 and the flange 3, and is used to fix the ends of a plurality of U-shaped heat exchange tubes 12.

[0031] The spiral baffle assembly includes a central tube 8, a first spiral baffle 9 and a plurality of second spiral baffles 10 connected in series; the first spiral baffle 9 is arranged in a 90° fan-shaped structure, and the second spiral baffle 10 is arranged in a 180° fan-shaped structure. The first spiral baffle 9 and a plurality of second spiral baffles 10 are connected in series on the outer wall of the central tube 8 to form a spiral guide structure.

[0032] The baffle assembly includes a liquid baffle plate 4, a first baffle plate 5, a second baffle plate 6 and a third baffle plate 7 with baffle notches arranged in a staggered manner along the circumferential direction of the cylinder body. The water inlet 15 of the cylinder body 13 is located in the space surrounded by the liquid baffle plate 4, the tube sheet 2, the first baffle plate 5 and the first spiral baffle plate 9, and the water outlet 16 of the cylinder body 13 is located at the end of the spiral baffle assembly.

[0033] like Figure 7 As shown, the liquid baffle plate 4 is located at the 0° position of the cylinder, the first baffle plate 5 is located at the 90° position of the cylinder, and a first baffle notch 51 is arranged on the side close to the tube sheet 2, the second baffle plate 6 is located at the 180° position of the cylinder, and a second baffle notch 61 is arranged on the side close to the second spiral baffle plate 10, and the third baffle plate 7 is located at the 270° position of the cylinder, and a third baffle notch 71 is arranged on the side close to the tube sheet 2.

[0034] The inner sides of the liquid baffle plate 4, the first baffle plate 5, the second baffle plate 6 and the third baffle plate 7 are all welded or glued to the central tube 8, and the outer sides are all clearance-matched with the cylinder 13, and the preferred clearance is 1 mm; the left and right sides of the liquid baffle plate 4 are respectively welded or glued to the tube sheet 2 and the first spiral baffle plate 9, the right side of the first baffle plate 5 is welded or glued to the first spiral baffle plate 9, the left side of the second baffle plate 6 is welded or glued to the tube sheet 2, and the right side of the third baffle plate 7 is welded or glued to the second spiral baffle plate 10.

[0035] During actual molding and manufacturing, the liquid baffle 4, the first baffle 5, the second baffle 6 and the third baffle 7 are all made of stainless steel plates, preferably with a thickness of 4 mm.

[0036] The baffle assembly divides the area between the tube sheet 2 and the spiral baffle assembly in the cylinder into four baffle areas, the first baffle area 21 is between the liquid baffle 4 and the first baffle 5, the second baffle area 22 is between the first baffle 5 and the second baffle 6, the third baffle area 23 is between the second baffle 6 and the third baffle 7, and the fourth baffle area 24 is between the third baffle 7 and the liquid baffle 4. External liquid enters from the first baffle area 21 and flows into the fourth baffle area 24 in sequence. This structure can prevent liquid from stagnating in a certain area and avoid local ice formation.

[0037] The cylinder 13 is provided with a sewage outlet 17 at the lowest point, through which the internal sediment can be discharged.

[0038] The liquid baffle plate 4 is provided with a drainage hole 41 near the tube sheet, and the drainage hole 41 is preferably a circular hole and has a diameter of 6 mm. Since the liquid baffle plate 4 has no baffle notch, when the unit needs to be shut down in winter, the bottom water of the first baffle area 21 can be discharged to the bottom of the cylinder 13 through the drainage hole 41, and then discharged from the device through the sewage outlet 17. When the unit is ensured to stop running in winter, the shell side water of the device can be discharged more thoroughly, thereby improving the antifreeze reliability of the evaporator.

[0039] In the above-mentioned dry evaporator, the length L1 of the first baffle notch, the length L2 of the second baffle notch, and the length L3 of the third baffle notch are all smaller than the unit pitch L4 of the spiral baffle assembly; the technical solution constrains L1=L2=L3; through the above-mentioned baffle assembly setting, the water flowing in through the evaporator shell water inlet 15 needs to flow through the first baffle area 21, the first baffle notch 51, the second baffle area 22, the second baffle notch 61, the third baffle area 23, the third baffle notch 71, and the fourth baffle area 24 in sequence, and then enter the spiral channel of the spiral baffle assembly. This design optimizes the path of water flowing through the vicinity of the tube sheet 2, increases the flow rate of water flowing through the inner surface of the tube sheet 2, avoids the problem of water freezing in the area near the inner surface of the tube sheet 2, effectively avoids the bulging and freezing of the heat exchange tubes in this area, enhances the reliability of the dry evaporator, and at the same time enables the heat exchange tubes in the area near the tube sheet to participate more fully in the heat exchange, improves the heat exchange efficiency in the area near the tube sheet, and optimizes the performance of the evaporator and the unit.

[0040] The above description is only a preferred implementation mode of the present utility model. As long as the technical solution of the purpose of the present utility model is achieved by basically the same means, it belongs to the protection scope of the present utility model.

Claims

1. A dry evaporator, characterized in that: It includes a pipe box, a flange, a cylinder, and an end cover connected together; a bracket is arranged at the bottom of the cylinder; A baffle assembly is arranged inside the cylinder, and the baffle assembly includes a baffle assembly, a spiral baffle assembly and a tube sheet arranged inside the cylinder; The baffle assembly comprises a liquid baffle, a first baffle, a second baffle and a third baffle arranged at intervals, and the first baffle, the second baffle and the third baffle are all provided with baffle notches, and a passage for flowing into the spiral baffle assembly is formed by the liquid baffle, multiple baffles and the baffle notches, and the passage is connected to the spiral baffle assembly to form a spiral passage; the water inlet of the cylinder is located in the space surrounded by the liquid baffle or the baffle in the baffle assembly; the water outlet of the cylinder is located at the end of the spiral baffle assembly; the spiral plate in the spiral baffle assembly is provided with fixing holes, and the connection and fixation of the U-shaped tube is realized through the fixing holes.

2. The dry evaporator according to claim 1, characterized in that: The spiral baffle assembly includes a central tube, a first spiral baffle and a plurality of second spiral baffles; the first spiral baffle is arranged in a 90° fan-shaped structure, and the second spiral baffle is arranged in a 180° fan-shaped structure; the first spiral baffle and the second spiral baffle are fixed together.

3. The dry evaporator according to claim 1, characterized in that: The liquid baffle is located at the 0° position of the cylinder, the first baffle is located at the 90° position of the cylinder, and a first baffle notch is set on the side close to the tube sheet, the second baffle is located at the 180° position of the cylinder, and a second baffle notch is set on the side close to the second spiral baffle, and the third baffle is located at the 270° position of the cylinder, and a third baffle notch is set on the side close to the tube sheet.

4. The dry evaporator according to claim 1, characterized in that: The inner sides of the liquid baffle, the first baffle, the second baffle and the third baffle are all welded or glued to the central tube, and the outer sides are all matched with the cylinder gap; the left and right sides of the liquid baffle are respectively welded or glued to the tube sheet and the first spiral baffle; the right side of the first baffle is welded or glued to the first spiral baffle; the left side of the second baffle is welded or glued to the tube sheet; the right side of the third baffle is welded or glued to the second spiral baffle.

5. The dry evaporator according to claim 1, characterized in that: The liquid baffle plate, the first baffle plate, the second baffle plate and the third baffle plate are made of metal plates or plastic plates.

6. The dry evaporator according to claim 1, characterized in that: The liquid baffle plate is provided with a liquid drain hole near the tube plate.

7. The dry evaporator according to claim 1, characterized in that: The cylinder is provided with a sewage outlet at the lowest point.

8. The dry evaporator according to claim 3, characterized in that: The first baffle notch length L1, the second baffle notch length L2, and the third baffle notch length L3 are all smaller than the unit pitch L4 of the spiral baffle assembly and L1=L2=L3.

9. The dry evaporator according to claim 1, characterized in that: The baffle assembly divides the area between the tube sheet in the cylinder and the spiral baffle assembly into four baffle zones. The first baffle zone is between the liquid baffle and the first baffle, the second baffle zone is between the first baffle and the second baffle, the third baffle zone is between the second baffle and the third baffle, and the fourth baffle zone is between the third baffle and the liquid baffle.

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