Double-layer water stop structure of small-temperature-difference waste heat recovery pipe

Abstract

A small-temperature-difference waste heat recovery pipe double-layer water stop structure comprises a heat exchange shell, a U-shaped heat exchange pipe, a heat exchange pipe flange and a shell flange. The heat exchange shell is arranged to be of a hollow circular-tube-shaped structure, a circular-tube-shaped heat exchange cavity is formed in the hollow circular-tube-shaped structure, one end of the heat exchange shell is arranged to be a closed end, the other end of the heat exchange shell is arranged to be an open end, and a U-shaped heat exchange tube is arranged in the heat exchange cavity. The U-shaped heat exchange tube is taken out of or installed in the heat exchange cavity through the open end of the heat exchange shell, the trapezoid water stop structure and the sheet type water stop structure are arranged, the trapezoid water stop structure and the sheet type water stop structure adopt two different structural forms of water stop sealing structures, the double-layer water stop sealing effect is achieved, the production cost is relatively low, the heat exchange effect is good, and the heat exchange effect is good. Installation and maintenance are convenient, the sealing effect is good, and the device is suitable for waterstop sealing between small-temperature-difference waste heat recovery pipe flanges; in addition, the spiral flow guide plate is adopted in the technical scheme, the flow path is increased, and the heat exchange rate is effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of waste heat recovery, more particularly to a small temperature difference waste heat recovery pipe double -layer water stop structure. BACKGROUND

[0002] At present, the recovery of small temperature difference waste heat has become the important measure of energy saving and cost reduction of numerous enterprises, and has become the important means of pursuing energy efficiency and environmental protection in parallel in the modern industrial field, which can not only greatly reduce energy consumption, but also effectively reduce the emission of waste heat, realize the reuse of energy, and thus bring significant economic benefits to enterprises.

[0003] In the process of small temperature difference waste heat recovery, the most commonly used method is heat exchanger recovery, which is to use a heat exchanger to exchange heat between low temperature waste heat and another fluid, so that the low temperature waste heat can be utilized. This method is simple to operate and has remarkable effect, and is widely used in various industrial occasions, especially suitable for mariculture, but in the process of use, in order to improve the heat exchange efficiency, the way of pressure pumping is often used, and the water stop sealing of connecting flange becomes an important technical problem. The flange water stop sealing of the prior art generally uses O-shaped ring of different materials, such as:

[0004] The utility model patent with patent number 201220446158.8, patent name: high temperature pipeline flange sealing device; discloses that "graphite gasket" is used for sealing between valve and high temperature pipeline connecting flange, which is to solve the problem that flange will inevitably deform in high temperature state for a long time. The utility model patent with patent number 202220175405.9 discloses a metal sealing ring suitable for pipeline flange sealing.

[0005] The above sealing schemes all solve the sealing problem under different conditions, but the sealing effect is not ideal during the flange connection process due to the high hardness of graphite gasket; the metal sealing ring has complex manufacturing process and requires fine processing of size, and special materials and precision machining are needed for production, so the cost is relatively high, and the installation needs to strictly control the installation parameters to ensure correct sealing effect; therefore, they are not suitable for water stop sealing between flanges of small temperature difference waste heat recovery pipes. SUMMARY

[0006] In order to solve the above problems, the utility model provides a small temperature difference waste heat recovery pipe double -layer water stop structure, which effectively solves the sealing and water stop problem in the process of waste heat recovery, improves the heat exchange efficiency, and is especially suitable for sealing and water stop between flanges of small temperature difference waste heat recovery pipes, and the specific scheme is:

[0007] The small temperature difference waste heat recovery pipe double -layer water stop structure comprises: a heat exchange shell, a U-shaped heat exchange pipe, a heat exchange pipe flange and a shell flange.

[0008] The heat exchange shell is provided as a hollow circular tube structure, the inside of the hollow circular tube structure constitutes a circular tube heat exchange cavity, one end of the heat exchange shell is provided as a closed end, the other end of the heat exchange shell is provided as an open end, a U-shaped heat exchange pipe is arranged in the heat exchange cavity, the U-shaped heat exchange pipe is taken out or installed in the heat exchange cavity through the open end of the heat exchange shell, and a preset number of U-shaped heat exchange pipes are arranged in the heat exchange cavity in a predetermined arrangement mode through spiral guide plates;

[0009] The open end of the heat exchange shell is provided with a shell flange in an integral molding structure and a circular ring plate structure, an inner hole diameter of the shell flange is equal to the diameter of the heat exchange cavity, the open end of the U-shaped heat exchange pipe is fixedly provided with a heat exchange pipe flange, the outer diameters of the shell flange and the heat exchange pipe flange are equal, the shell flange and the heat exchange pipe flange are fixedly connected through a flange connecting bolt, and a water stop structure is arranged between the shell flange and the heat exchange pipe flange;

[0010] The water stop structure comprises a trapezoidal water stop structure and a sheet type water stop structure, the water stop structure is arranged in a ring shape and is hermetically sealed, the ring center of the water stop structure is concentric with the center of the shell flange, the trapezoidal water stop structure and the sheet type water stop structure are concentrically arranged on the surface of the shell flange and the heat exchange pipe flange which are fixedly connected and in contact, and the diameter of the trapezoidal water stop structure is smaller than that of the sheet type water stop structure;

[0011] The trapezoidal water stop structure comprises a trapezoidal groove I, a trapezoidal groove II, a rectangular notch and a water stop rubber ring I, the trapezoidal groove I is arranged on the side surface of the shell flange which is in contact and connected with the heat exchange pipe flange, the trapezoidal groove I is provided as a circular ring structure with a trapezoidal cross section, the long bottom edge of the trapezoidal groove I is outwardly opened, and the center of the circular ring structure of the trapezoidal groove I is concentric with the center of the shell flange; the trapezoidal groove II is arranged on the side surface of the heat exchange pipe flange which is in contact and connected with the shell flange, the long bottom edge of the trapezoidal groove II is outwardly opened, the size and shape of the trapezoidal groove II are the same as those of the trapezoidal groove I, and the trapezoidal groove II is symmetrically arranged with the trapezoidal groove I;

[0012] The rectangular notch is arranged between the trapezoidal groove I and the trapezoidal groove II, the rectangular notch, the trapezoidal groove I and the trapezoidal groove II together constitute a trapezoidal water stop cavity, and the water stop rubber ring I is arranged in the trapezoidal water stop cavity; the size and shape of the water stop rubber ring I are sealingly filled and matched with the size and shape of the trapezoidal water stop cavity;

[0013] The sheet type water stop structure comprises a circular groove, a rubber ring clamping block, a water stop rubber ring II and a circular protrusion, the circular groove is arranged on the side surface of the shell flange on the side in contact with the heat exchange pipe flange, the circular groove is arranged in a circular ring structure with a semicircular cross section, the opening of the circular groove is outward, a pair of rubber ring clamping blocks are symmetrically arranged on the upper end and the lower end of the opening side of the circular groove, the water stop rubber ring II is clamped in the circular groove through the rubber ring clamping block, and the center of the circular ring structure of the circular groove is concentric with the center of the shell flange; the circular protrusion is arranged on the side surface of the heat exchange pipe flange on the side in contact with the shell flange, the circular protrusion is arranged in a circular ring structure with a semicircular cross section, and the size and shape of the circular groove are matched with the size and shape of the circular protrusion, that is, when the water stop rubber ring II is clamped in the circular groove, the circular protrusion plays a clamping sealing and compacting role on the water stop rubber ring II;

[0014] The outer side of the heat exchange pipe flange is provided with an end cover, the end cover is fixedly connected with the heat exchange pipe flange through an end cover connecting bolt arranged at a center position, an inlet cavity is arranged on the inner upper side between the end cover and the heat exchange pipe flange, an outlet cavity is arranged on the inner lower side between the end cover and the heat exchange pipe flange, the opening of one end of the U-shaped heat exchange pipe is communicated with the inlet cavity, the opening of the other end of the U-shaped heat exchange pipe is communicated with the outlet cavity, and the upper portion of the end cover is provided with a medium inlet communicated with the inlet cavity.

[0015] One end of the heat exchange shell is provided with a water inlet communicated with the heat exchange cavity, and the other end of the heat exchange shell is provided with a water outlet communicated with the heat exchange cavity.

[0016] The materials of the water stop rubber ring I and the water stop rubber ring II are polyurethane or fluorine rubber, have good high-temperature resistance, chemical corrosion resistance, oxidation resistance and long-term ultraviolet resistance, and are suitable for small-temperature-difference waste heat recovery environments, especially waste heat recovery environments in the process of mariculture.

[0017] The utility model discloses the beneficial effect is: be provided with trapezoidal water stop structure and sheet type water stop structure, and trapezoidal water stop structure and sheet type water stop structure adopt two different structure forms's water stop sealing structure, have played double -deck water stop sealing effect, and the production cost is relatively lower, and the installation maintenance is convenient, and the sealing effect is good, is applicable to small -temperature -difference waste heat recovery pipe flange between water stop sealing, in addition, this technical scheme adopts the spiral flow guide plate, increases the flow, effectively improves the heat exchange rate. BRIEF DESCRIPTION OF DRAWINGS

[0018] ATTACHED Figure 1 It is the structure schematic diagram of the utility model;

[0019] ATTACHED Figure 2 It is the structure schematic diagram of the utility model A view;

[0020] Appendix Figure 3 This is an enlarged structural schematic diagram of section B of this utility model;

[0021] Appendix Figure 4 This is an enlarged structural schematic diagram of point C of this utility model; in the attached diagram:

[0022] 1. Heat exchange shell, 11. Inlet, 12. Heat exchange chamber, 13. Outlet, 14. Shell flange, 2. U-shaped heat exchange tube, 21. Spiral guide plate, 22. Heat exchange tube flange, 3. Water-stopping structure, 31. Plate-type water-stopping structure, 311. Circular groove, 312. Rubber ring retainer, 313. Water-stopping rubber ring II, 314. Circular protrusion, 32. Trapezoidal water-stopping structure, 321. Trapezoidal groove I, 322. Water-stopping rubber ring I, 323. Rectangular groove, 324. Trapezoidal groove II, 4. Flange connecting bolts, 5. End cap, 51. Inlet chamber, 52. Medium inlet, 53. Medium outlet, 54. Outlet chamber, 6. End cap connecting bolts. Detailed Implementation

[0023] Combined with appendix Figure 1 ~Attached Figure 4 This utility model will be described in further detail to enable the public to better understand its implementation method. The specific implementation method of this utility model is as follows:

[0024] The double-layer water-stop structure of the small temperature difference waste heat recovery pipe includes a heat exchange shell 1, a U-shaped heat exchange tube 2, a shell flange 14, and a heat exchange tube flange 22;

[0025] The heat exchange shell 1 is configured as a hollow cylindrical tube structure, and the interior of the hollow cylindrical tube structure forms a cylindrical heat exchange cavity 12. One end of the heat exchange shell 1 is a closed end, and the other end is an open end. A U-shaped heat exchange tube 2 is installed in the heat exchange cavity 12. The U-shaped heat exchange tube 2 is taken out through the open end of the heat exchange shell 1 or installed in the heat exchange cavity 12. A predetermined number of U-shaped heat exchange tubes 2 are arranged in the heat exchange cavity 12 in a predetermined manner through a spiral guide plate 21. The hot water in the heat exchange cavity 12 conducts heat to the exchange medium in the U-shaped heat exchange tube 2 to complete the heat exchange. The heat exchange efficiency is high, and it can exchange waste heat with small temperature differences.

[0026] The opening end of the heat exchange shell 1 is provided with a shell flange 14 in a one-piece structure, the shell flange 14 is provided with an inner hole diameter equal to the diameter of the heat exchange cavity 12; the opening end of the U-shaped heat exchange pipe 2 is fixedly provided with a heat exchange pipe flange 22 in a circular plate structure, the outer diameter of the shell flange 14 is equal to that of the heat exchange pipe flange 22, the shell flange 14 and the heat exchange pipe flange 22 are fixedly connected through a flange connecting bolt 4, and a water stop structure 3 is arranged between the shell flange 14 and the heat exchange pipe flange 22; the heat exchange cavity 12 forms a closed cavity, and the heat exchange efficiency is effectively improved.

[0027] The water stop structure 3 is arranged in a circular ring shape, the annular center of the water stop structure 3 is concentric with the center of the shell flange 14, the water stop structure 3 includes a sheet type water stop structure 31 and a trapezoidal water stop structure 32, the sheet type water stop structure 31 and the trapezoidal water stop structure 32 are concentrically arranged on the surface of the shell flange 14 and the heat exchange pipe flange 22 which are fixedly connected, the diameter of the trapezoidal water stop structure 32 is smaller than that of the sheet type water stop structure 31;

[0028] The trapezoidal water stop structure 32 includes a trapezoidal groove I 321, a trapezoidal groove II 324, a rectangular notch 323 and a water stop rubber ring I 322, the trapezoidal groove I 321 is arranged on the side surface of the shell flange 14 which is connected with the heat exchange pipe flange 22, the trapezoidal groove I 321 is arranged in a circular ring structure with a trapezoidal cross section, the long bottom of the trapezoidal groove I 321 is outwardly opened, and the center of the circular ring structure of the trapezoidal groove I 321 is concentric with the center of the shell flange 14; the trapezoidal groove II 324 is arranged on the side surface of the heat exchange pipe flange 22 which is connected with the shell flange 14, the long bottom of the trapezoidal groove II 324 is outwardly opened, the size and shape of the trapezoidal groove II 324 are the same as those of the trapezoidal groove I 321, and the trapezoidal groove II 324 is symmetrically arranged with the trapezoidal groove I 321;

[0029] The rectangular notch 323 is arranged between the trapezoidal groove I 321 and the trapezoidal groove II 324, the rectangular notch 323, the trapezoidal groove I 321 and the trapezoidal groove II 324 together form a trapezoidal water stop cavity, and the water stop rubber ring I 322 is arranged in the trapezoidal water stop cavity; the size and shape of the water stop rubber ring I 322 match those of the trapezoidal water stop cavity, that is, when the shell flange 14 and the heat exchange pipe flange 22 are connected and fixed, the water stop rubber ring I 322 can densely fill the trapezoidal water stop cavity, thereby playing a sealing and water stopping role;

[0030] The sheet type water stop structure 31 comprises a circular groove 311, a rubber ring clamping block 312, a water stop rubber ring II 313 and a circular protrusion 314. The circular groove 311 is arranged on the side of the shell flange 14 which is in contact with the heat exchange pipe flange 22. The circular groove 311 is arranged in a circular ring structure with a semicircular cross section. The opening of the circular groove 311 is outward. A pair of rubber ring clamping blocks 312 are symmetrically arranged on the upper end and the lower end of the opening side of the circular groove 311. The water stop rubber ring II 313 is arranged in the circular groove 311 through the rubber ring clamping block 312. The center of the circular ring structure of the circular groove 311 is concentric with the center of the shell flange 14. The circular protrusion 314 is arranged on the side of the heat exchange pipe flange 22 which is in contact with the shell flange 14. The circular protrusion 314 is arranged in a circular ring structure with a semicircular cross section. The size and shape of the circular groove 311 match those of the circular protrusion 314. When the water stop rubber ring II 313 is installed and clamped in the circular groove 311, the circular protrusion 314 plays a clamping sealing and compacting role on the water stop rubber ring II 313. Compared with the O-ring, the sheet type water stop structure 31 effectively prolongs the water penetration path and improves the water stop sealing effect.

[0031] The outer side of the heat exchange pipe flange 22 is provided with an end cover 5. The end cover 5 is fixedly and sealingly connected with the heat exchange pipe flange 22 through an end cover connecting bolt 6 arranged at the center position. An inlet cavity 51 is arranged on the inner upper side between the end cover 5 and the heat exchange pipe flange 22. An outlet cavity 54 is arranged on the inner lower side between the end cover 5 and the heat exchange pipe flange 22. The opening of one end of the U-shaped heat exchange pipe 2 is in communication with the inlet cavity 51. The opening of the other end of the U-shaped heat exchange pipe 2 is in communication with the outlet cavity 54. The upper part of the end cover 5 is provided with a medium inlet 52 which is in communication with the inlet cavity 51. The lower part of the end cover 5 is provided with a medium outlet 53 which is in communication with the outlet cavity 54. After the heat exchange medium enters through the medium inlet 52, it completes heat exchange through the U-shaped heat exchange pipe 2 and then flows out through the medium outlet 53, thereby completing the exchange and transmission of heat.

[0032] One end of the heat exchange shell 1 is provided with a water inlet 11 which is in communication with the heat exchange cavity 12. The other end of the heat exchange shell 1 is provided with a water outlet 13 which is in communication with the heat exchange cavity 12.

[0033] The materials of the water stop rubber ring I 322 and the water stop rubber ring II 313 are polyurethane or fluorine rubber, which have good high temperature resistance, chemical corrosion resistance, oxidation resistance and long-term ultraviolet resistance, and are suitable for small temperature difference waste heat recovery environments, especially in the process of seawater aquaculture.

Claims

1. A small-temperature-difference waste heat recovery pipe double-layer water stop structure, comprising a heat exchange shell (1), a U-shaped heat exchange pipe (2), a shell flange (14) and a heat exchange pipe flange (22); characterized in that: the heat exchange shell (1) is arranged in a hollow circular tube shape, a circular tube-shaped heat exchange cavity (12) is formed inside the hollow circular tube shape, one end of the heat exchange shell (1) is arranged as a closed end, the other end of the heat exchange shell (1) is arranged as an open end, a U-shaped heat exchange pipe (2) is arranged in the heat exchange cavity (12), the U-shaped heat exchange pipe (2) is taken out or installed in the heat exchange cavity (12) through the open end of the heat exchange shell (1), and a preset number of U-shaped heat exchange pipes (2) are arranged in the heat exchange cavity (12) in a predetermined arrangement manner through a spiral guide plate (21); the open end of the heat exchange shell (1) is provided with a circular ring plate-shaped shell flange (14) in an integral molding structure, an inner hole diameter of the shell flange (14) is equal to the diameter of the heat exchange cavity (12); the open end of the U-shaped heat exchange pipe (2) is fixedly provided with a circular ring plate-shaped heat exchange pipe flange (22), the outer diameters of the shell flange (14) and the heat exchange pipe flange (22) are equal, the shell flange (14) and the heat exchange pipe flange (22) are fixedly connected through a flange connecting bolt (4), and a water stop structure (3) is arranged between the shell flange (14) and the heat exchange pipe flange (22); the water stop structure (3) is arranged in a circular ring shape, the ring center of the water stop structure (3) is concentric with the center of the shell flange (14), the water stop structure (3) comprises a sheet type water stop structure (31) and a trapezoidal water stop structure (32), the sheet type water stop structure (31) and the trapezoidal water stop structure (32) are concentrically arranged on the surface of the fixed connection between the shell flange (14) and the heat exchange pipe flange (22), and the diameter of the trapezoidal water stop structure (32) is smaller than that of the sheet type water stop structure (31). the trapezoidal water stop structure (32) comprises a trapezoidal groove I (321), a trapezoidal groove II (324), a rectangular slot (323) and a water stop rubber ring I (322), the trapezoidal groove I (321) is arranged on the side surface of the shell flange (14) on the side connected with the heat exchange pipe flange (22), the trapezoidal groove I (321) is arranged in a circular ring structure with a trapezoidal cross section, the long bottom of the trapezoidal groove I (321) is outwardly opened, and the center of the circular ring structure of the trapezoidal groove I (321) is concentric with the center of the shell flange (14); the trapezoidal groove II (324) is arranged on the side surface of the heat exchange pipe flange (22) on the side connected with the shell flange (14), the long bottom of the trapezoidal groove II (324) is outwardly opened, the size and shape of the trapezoidal groove II (324) are the same as those of the trapezoidal groove I (321), and the trapezoidal groove II (324) is symmetrically arranged with the trapezoidal groove I (321); 2. The small temperature difference waste heat recovery pipe double layer water stop structure according to claim 1, characterized in that, ​ The rectangular notch (323) is arranged between the trapezoidal groove I (321) and the trapezoidal groove II (324), and the rectangular notch (323) and the trapezoidal groove I (321) and the trapezoidal groove II (324) together form a trapezoidal water stop cavity, and the water stop rubber ring I (322) is arranged in the trapezoidal water stop cavity; the size and shape of the water stop rubber ring I (322) match the size and shape of the trapezoidal water stop cavity, that is, when the shell flange (14) is connected and fixed with the heat exchange pipe flange (22), the water stop rubber ring I (322) can densely fill the trapezoidal water stop cavity.

3. The small temperature difference waste heat recovery pipe double layer water stop structure according to claim 1, characterized in that, The sheet type water stop structure (31) comprises a circular groove (311), a rubber ring clamping block (312), a water stop rubber ring II (313) and a circular protrusion (314), the circular groove (311) is arranged on the side of the shell flange (14) on the side in contact with the heat exchange pipe flange (22), the circular groove (311) is arranged in a circular ring structure with a semicircular cross section, the opening of the circular groove (311) is outward, a pair of rubber ring clamping blocks (312) are symmetrically arranged on the upper end and the lower end of the opening side of the circular groove (311), the water stop rubber ring II (313) is clamped in the circular groove (311) through the rubber ring clamping block (312), and the center of the circular ring structure of the circular groove (311) is concentric with the center of the shell flange (14); the circular protrusion (314) is arranged on the side of the heat exchange pipe flange (22) on the side in contact with the shell flange (14), the circular protrusion (314) is arranged in a circular ring structure with a semicircular cross section, and the size and shape of the circular groove (311) match the size and shape of the circular protrusion (314).

4. The small temperature difference waste heat recovery pipe double layer water stop structure according to claim 1, characterized in that, The outer side of the heat exchange pipe flange (22) is provided with an end cover (5), the end cover (5) is fixed and sealed with the heat exchange pipe flange (22) through the end cover connecting bolt (6) arranged at the center position, the inner upper side between the end cover (5) and the heat exchange pipe flange (22) is provided with an inlet cavity (51), the inner lower side between the end cover (5) and the heat exchange pipe flange (22) is provided with an outlet cavity (54), the opening of one end of the U-shaped heat exchange pipe (2) is in communication with the inlet cavity (51), the opening of the other end of the U-shaped heat exchange pipe (2) is in communication with the outlet cavity (54), and the upper part of the end cover (5) is provided with a medium inlet (52) in communication with the inlet cavity (51), and the lower part of the end cover (5) is provided with a medium outlet (53) in communication with the outlet cavity (54).

5. The small temperature difference waste heat recovery pipe double sealing structure according to claim 1, characterized in that, One end of the heat exchange shell (1) is provided with a water inlet (11) in communication with the heat exchange cavity (12), and the other end of the heat exchange shell (1) is provided with a water outlet (13) in communication with the heat exchange cavity (12).

6. The small temperature difference waste heat recovery pipe double sealing structure according to claim 2, characterized in that, The materials of the water stop rubber ring I (322) and the water stop rubber ring II (313) are polyurethane or fluorine rubber.

Images