CN103697726B - A kind of case tube heat exchanger - Google Patents

Abstract

The invention relates to a shell-and-tube heat exchanger, in particular to a water-cooled shell-and-tube condenser for a refrigeration system. It includes the shell and the tube heat exchanger arranged in the shell. The end cover of the tube heat exchanger is connected to the cover plate assembly through the fixing plate, and the cover plate assembly is connected to the shell through the tube plate. The motor shaft passes through the end cover through the motor shaft sleeve, the motor shaft is equipped with a driving wheel, the driving wheel drives a plurality of driven wheels, the driven wheels are connected to the rotating shaft, and the rotating shaft is arranged along the axial center of the heat exchange tubes. The outer side of the rotating shaft is equipped with rotating blades that closely match the inner wall of the heat exchange tube. The shell-and-tube heat exchanger of the present invention can not only scrape off the silt, moss, etc. The degree of turbulence in the heat pipe improves the convective heat transfer coefficient and the total heat transfer coefficient in the pipe, strengthens the heat transfer effect, and prolongs the service life of the heat exchanger.

Description

A shell and tube heat exchanger

technical field

The invention relates to a shell-and-tube heat exchanger, in particular to a water-cooled shell-and-tube condenser for a refrigeration system.

technical background

Shell and tube heat exchangers are frequently used heat exchange equipment in the fields of air conditioning, refrigeration, etc. Generally, in the heat exchange of heat exchangers

The medium flowing in the condenser is water. Due to the presence of impurities in the water, it is easy to scale when the water temperature is high. Especially for water-cooled shell-and-tube condensers used in national defense and civil air defense projects, the cooling water comes from outdoor cooling towers or Natural cold sources, due to the seasonal use of air conditioners and refrigeration equipment in national defense, civil air defense and other projects, the air conditioners and refrigeration equipment are intermittently running and stopped. A large number of moss, etc., seriously affect the heat exchange effect of the heat exchanger, and seriously cause the heat exchanger to be scrapped.

Contents of the invention

The purpose of the present invention is to provide a shell-and-tube heat exchanger that increases the turbulent flow on the water side of the heat exchange tube, improves the heat exchange efficiency, and prevents the accumulation and growth of silt and moss.

Technical scheme of the present invention is:

A shell-and-tube heat exchanger, including a shell and a tube-and-tube heat exchanger arranged in the shell. The end cover of the tube-and-tube heat exchanger is connected to a cover plate assembly through a fixing plate, and the cover plate assembly is connected to the shell through a tube plate. The cover is equipped with a deceleration motor, and the motor shaft of the deceleration motor passes through the end cover through the motor shaft sleeve. The motor shaft is equipped with a driving wheel, and the driving wheel drives a plurality of driven wheels. Arranged in the center of the axial direction, on the outer side of the rotating shaft, there are rotating blades that closely match the inner wall of the heat exchange tube. , the driven wheel is inside the driving wheel, and the driving wheel is an internal gear.

The rotating blades are densely distributed on the rotating shaft, and the cylindrical surface drawn by the rotation of the end faces of the blades makes the inner wall of the heat exchange tube have no gaps.

The rotating blades are made of plastic.

The rotating blades are sequentially arranged in a staggered manner by 60° on the rotating shaft.

The rotating blades are elastic fiber brushes.

Beneficial effect:

Compared with the common shell-and-tube heat exchanger, although the shell-and-tube heat exchanger of the present invention has increased components such as rotating blades and geared motors, and consumes power, the rotation of the rotating blades can not only remove the sludge, Scraping off moss, etc. avoids clogging, increases the degree of turbulence in the heat exchange tube, improves the convective heat transfer coefficient and the total heat transfer coefficient in the tube, strengthens the heat transfer effect, and prolongs the service life of the heat exchanger.

Description of drawings

Accompanying drawing 1 is the structural representation of this product;

Accompanying drawing 2 is the structure diagram of rotating blade 17 in heat exchange tube 15;

Accompanying drawing 3 is the structural representation of the driving wheel in embodiment 2;

Accompanying drawing 4 is the structural representation of driving wheel of embodiment 1;

Accompanying drawing 5 is the structural representation of driven wheel;

Accompanying drawing 6 is the structural representation of rotating blade 17;

Accompanying drawing 7 is the structural representation of embodiment 2;

In the drawings: 1-first end cover, 2-first tube sheet, 3-housing, 4-second tube sheet, 5-second fixed plate, 6-driving wheel,

7-Second end cover, 8-Motor shaft sleeve, 9-Deceleration motor, 10-Motor shaft, 11-Clamp, 12-Follower wheel, 13-First sleeve, 14-First retaining ring, 15-Change Heat pipe, 16-driven shaft, 17-rotating blade, 18-first fixed plate, 19-second shaft sleeve, 20-second retaining ring, 101-inlet pipe, 102-cooling water outlet pipe, 103-cooling Water inlet pipe, 104-outlet pipe, 201-second cover assembly, 202-first cover assembly.

detailed description

A shell-and-tube heat exchanger of the present invention will be described in detail below in conjunction with the accompanying drawings.

Example 1:

A shell-and-tube heat exchanger, which consists of: a tube-and-tube heat exchanger, the end cover 1 of which is connected to a cover plate assembly 202 through a fixing plate 18, and the cover plate assembly 202 is connected to a shell through a tube plate 2 3. The shell 3 is connected to the cover plate assembly 201 through the tube plate 4, and the cover plate assembly 201 is connected to the end cover 7. The end cover 7 is equipped with a reduction motor 9, and the motor shaft 10 of the reduction motor 9 passes through the cover plate 7 through the sleeve 8. , driving wheel 21 is housed on motor shaft 10, and driving wheel 21 drives a plurality of driven wheels 12, and driven wheel 12 connects rotating shaft 16, and rotating shaft 16 passes fixed plate 5 by axle sleeve 13, retaining ring 14, and rotating shaft 16 is equipped with A plurality of rotating blades 17 , the rotating blades 17 closely match the inner wall of the heat exchange tube 15 , and the other end of the rotating shaft 16 is fixed on the fixed plate 18 through the shaft sleeve 19 and the retaining ring 20 .

The working process of the shell-and-tube heat exchanger is as follows: the reduction motor 9 is powered, the motor shaft 10 rotates, the driving wheel 21 fixed on the motor shaft 10 rotates, the driving wheel 21 drives the driven wheel 12, and the power is transmitted to each rotating wheel respectively. Shaft 16, the rotating shaft 16 drives the rotating blade 17 to rotate. The high-temperature gas enters the shell 3 of the shell-and-tube heat exchanger from the inlet pipe 101 and contacts the outer wall of the heat exchange tube 15. The cooling water enters the cover plate assembly 201 through the cooling water inlet pipe 103, and then enters the heat exchange tube 15 to absorb and exchange heat. The heat released by the high-temperature gas outside the heat pipe 15 is discharged from the heat exchanger from the cooling water outlet pipe 102. After the high-temperature gas releases heat, it becomes liquid and discharged from the heat exchanger from the outlet pipe 104. The rotating blades 17 in the heat exchange pipe 15 are continuously Rotate to scrape off the silt, moss, etc. on the inner wall of the heat exchange tube 15, and increase the turbulence of the cooling water at the same time.

The heat exchange tube 15 of the present invention is a bare tube, and an externally threaded tube can be used.

The shell-and-tube heat exchanger of the present invention is made of steel or plastic, and its strength should meet the requirements of relevant pressure vessels. The quantity of the heat pipes 15 of the present invention is determined according to the actual heat exchange.

Further, the rotating blades 17 are made of plastic material, which will not damage the heat exchange tube assembly.

Further, the rotating blade 17 is an elastic fiber brush.

Further, the rotating blades 17 are densely distributed on the rotating shaft 16 , and the cylindrical surface formed by the rotation of the end faces of the rotating blades 17 makes the inner wall of the heat exchange tube 15 have no gap.

Further, as shown in FIG. 6 , the rotating blades 17 are arranged sequentially staggered by 60° on the rotating shaft 16 .

Further, the driven wheel 12 is in the driving wheel 6, the driven wheel 12 is driven to rotate by the driving wheel 6, and the driven wheel 12 is driven to rotate by the adjacent driven wheel 12, and the driven wheel 12 must not be driven by the driven wheel 12 or the driving wheel 6. Drive rotation at the same time.

Embodiment 2: the installation of the driven wheel 12 and the driving wheel 6 can be as shown in Figure 7, wherein the driven wheel 12 is inside the driving wheel 6, and the driving wheel 6 is an internal gear. A driven wheel 12 can be arranged in the center, and correspondingly more heat exchange tubes 15 can be arranged in the center of the shell-and-tube heat exchanger.

Claims (5)

1. a case tube heat exchanger, comprise housing and be arranged in the tubular heat exchanger in housing, it is characterized in that: the end cap of tubular heat exchanger is by fixed head connection cover board component, cover plate assembly connects housing by tube sheet, reducing motor is housed on end cap, the motor shaft of reducing motor passes described end cap by motor shaft sleeve, driving wheel is housed on motor shaft, driving wheel drives multiple driven pulleys, driven pulley connection of rotating axle, turning cylinder is arranged along heat exchanging pipe axial centre, on the axle outside of described turning cylinder, be equipped with and the close-fitting rotating vane of heat exchanger tube inwall, the two ends of described turning cylinder are located on the fixed head at housing two ends by axle sleeve and back-up ring respectively, driven pulley is in driving wheel inner side, and driving wheel is internal gear.

2. a kind of case tube heat exchanger according to claim 1, is characterized in that, described rotating vane gathers on turning cylinder, and vane end faces is rotated the face of cylinder of marking makes heat exchanger tube inwall there is no blank.

3. a kind of case tube heat exchanger according to claim 2, is characterized in that, the 60 ° of arrangements of staggering successively on turning cylinder of described rotating vane.

4. a kind of case tube heat exchanger according to claim 3, is characterized in that, described rotating vane is plastic material.

5. a kind of case tube heat exchanger according to claim 1, is characterized in that, described rotating vane is elastomer brush.