Anti-blocking heat exchanger

Abstract

The utility model relates to the technical field of heat exchangers, and discloses an anti-blocking heat exchanger which comprises a shell, a fixing plate, heat exchange pipes, an inlet end cover, an outlet end cover and a filter screen, the filter screen covers all the heat exchange pipes and is detachably arranged in the inlet end cover, a supporting plate is arranged at the position, close to a feeding port, in the inlet end cover, and an impeller is rotationally arranged on the side, facing the fixing plate, of the supporting plate; the axial direction of the impeller is perpendicular to the end face of the filter screen, the end, away from the supporting plate, of the impeller is provided with a scraping plate, and the scraping plate is parallel to the end face of the filter screen and abuts against the filter screen. The effect of improving the working efficiency of the heat exchanger is achieved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of heat exchangers, in particular to a heat exchanger capable of preventing blockage. BACKGROUND

[0002] The shell-and-tube heat exchanger is a heat exchanger most widely used in chemical industry and alcohol production. The shell-and-tube heat exchanger mainly comprises a shell, a fixed plate, a heat exchange tube, an end cover, a baffle and the like. When the shell-and-tube heat exchanger performs heat exchange, one fluid enters from a connecting pipe at one end of the end cover, flows in the tube and flows out from an outlet pipe at the other end of the end cover, which is referred to as the tube side; and the other fluid enters from a connecting pipe at one place of the shell and flows out from another connecting pipe at the other place of the shell, which is referred to as the shell side.

[0003] The flow behavior of the tube side fluid and the shell side fluid in the shell-and-tube heat exchanger has an important influence on the heat transfer rate of the shell-and-tube heat exchanger. At present, the shell-and-tube heat exchanger operated in industrial production is basically that cold liquid flows in the heat exchange tube and hot liquid flows outside the heat exchange tube, and the heat exchange tube wall is used for heat exchange to heat the fluid material in the heat exchange tube.

[0004] A heat exchanger capable of preventing blockage disclosed in Chinese Patent No. CN219103824U comprises a shell, an inlet end cover, an outlet end cover, a heat exchange tube and a fixed plate. An inlet is fixedly connected to the inlet end cover and connected to one end of the shell through the cooperation of a flange and a bolt. An outlet is fixedly connected to the outlet end cover and connected to the other end of the shell through the cooperation of a flange and a bolt. A water inlet and a water outlet are fixedly connected to the shell. A fixed plate is fixedly connected to both ends of the shell. The heat exchange tube is provided with a plurality of heat exchange tubes, and the plurality of heat exchange tubes are fixedly connected between the two fixed plates. A filter screen is arranged in the inlet end cover and covers all the heat exchange tubes. A locking assembly for locking the filter screen is arranged on the fixed plate.

[0005] During use of the heat exchanger, the filter screen may be blocked by impurities due to long-time work, so that the heat exchanger needs to be stopped, and then the impurities are removed by workers before the heat exchanger is used again. This not only prolongs the working time of the heat exchanger, but also reduces the working efficiency of the heat exchanger. CONTENT OF THE UTILITY MODEL

[0006] In order to improve the working efficiency of the heat exchanger, the application provides a heat exchanger capable of preventing blockage.

[0007] The heat exchanger capable of preventing blockage provided by the application adopts the following technical scheme:

[0008] The application discloses an anti-blocking heat exchanger which comprises a shell, a fixed plate, heat exchange pipes, an inlet end cover, an outlet end cover and a filter screen.

[0009] According to the technical scheme, before the heat exchanger is used, an operator can selectively install a filter screen with a proper pore size according to the property of liquid material, and install the filter screen on the inlet end cover. During the working process of the heat exchanger, liquid material enters the inlet end cover from a feeding port and impacts on the guide blades of the impeller to make the impeller rotate, the rotating impeller synchronously rotates with the scraper, at this time, the impurities blocked on the filter screen are pushed away from the screen holes by the scraper, the smoothness of the liquid material flowing in the heat exchanger is improved, and the working efficiency of the heat exchange pipes is improved.

[0010] Optionally, the length of the scraper is matched with the size of the filter screen, and when the scraper rotates one circle, the scraping path of the scraper covers all the screen holes of the filter screen.

[0011] According to the technical scheme, the length of the scraper is matched with the size of the filter screen, the comprehensiveness of the impurity cleaning of the filter screen by the scraper is improved, the smoothness of the liquid material flowing in the heat exchanger is further improved, and the working efficiency of the heat exchange pipes is improved.

[0012] Optionally, a brush is arranged on the side of the scraper facing the filter screen, and the brush is in contact with the filter screen.

[0013] According to the technical scheme, the impurities clamped in the screen holes of the filter screen are swept out of the screen holes by the brush, and then the impurities are pushed away from the screen holes by the scraper, so that the possibility of the screen hole blockage is further reduced.

[0014] Optionally, a reinforcing rib is arranged at the connection between the scraper and the rotating rod.

[0015] According to the technical scheme, the reinforcing rib is arranged to reduce the possibility of separation between the scraper and the rotating rod due to the impact of the liquid material flow, and the stability of the connection between the scraper and the rotating rod is improved.

[0016] Optionally, a spiral conveying blade is coaxially arranged in each heat exchange pipe, and the blade of the spiral conveying blade is in contact with the inner wall of the heat exchange pipe.

[0017] According to the technical scheme, the spiral conveying blade arranged in the heat exchange pipe can increase the pipe length of the liquid material, improve the time length of the liquid material in the heat exchanger for heat exchange, and improve the heat exchange efficiency of the heat exchange pipe.

[0018] Optionally, the spiral conveying piece is inserted and matched with the heat exchange pipe, and a connecting rod is axially arranged on the spiral conveying piece, and a sleeve ring is connected to the end of the connecting rod close to the inlet end cover, and the sleeve ring is sleeved on the end of the heat exchange pipe extending out of the fixed plate.

[0019] By adopting the above technical scheme, the sleeve ring and the connecting rod provide support for the spiral conveying piece, and the operator can conveniently pull out the spiral conveying piece through the sleeve ring and the connecting rod when the heat exchanger stops working, and the spiral conveying piece can be conveniently cleaned independently, thereby improving the working efficiency of the heat exchanger in the subsequent cleaning process.

[0020] Optionally, the side of each connecting rod facing the inner wall of the heat exchange pipe is provided with a felt, and the felt is arranged in abutment with the inner wall of the heat exchange pipe.

[0021] By adopting the above technical scheme, when the heat exchanger stops working, the operator can rotate the sleeve ring to synchronously rotate the connecting rod and the spiral conveying piece, at this time, the felt scrapes off the impurities and scale adhered to the inner wall of the heat exchange pipe and drops on the spiral conveying piece, and then the spiral conveying piece is pulled out of the heat exchange pipe through the sleeve ring, at this time, the impurities and scale are taken out of the heat exchange pipe together with the spiral conveying piece, thereby improving the cleaning efficiency of the inner wall of the heat exchange pipe and prolonging the service life of the heat exchange pipe.

[0022] Optionally, a helical baffle is arranged on the inner wall of the shell along the length direction of the shell, and the helical baffles collectively sleeve a plurality of heat exchange pipes.

[0023] By adopting the above technical scheme, compared with the traditional arc-shaped baffle, the helical baffle reduces the heat transfer dead zone and to some extent reduces the back mixing phenomenon of the baffle, can effectively improve the heat transfer temperature difference, and thereby improve the heat exchange efficiency of the heat exchanger. And because the shell-side fluid in the helical channel is in a continuous helical plug flow state, the particulate matter and sediment can be washed away along the upper surface of the helical baffle, thereby reducing the structure velocity and prolonging the cleaning cycle of the heat exchanger shell and the service life of the shell.

[0024] In summary, the present application has at least one of the following beneficial technical effects:

[0025] 1. Before the heat exchanger is used, the operator selectively installs a filter screen with a suitable pore size according to the properties of the liquid material, and installs the filter screen on the inlet end cover. During the working process of the heat exchanger, the liquid material enters the inlet end cover from the inlet, and impacts on the guide vane of the impeller to make the impeller rotate, and the rotating impeller synchronously rotates with the scraper, at this time, the impurities blocked on the filter screen are pushed away from the screen hole by the scraper, thereby improving the smoothness of the flow of the liquid material in the heat exchanger, and thereby improving the working efficiency of the heat exchange pipe;

[0026] 2. The length of the scraper is matched with the size of the filter screen, which can improve the overall cleaning of the filter screen by the scraper, further improve the smoothness of the liquid material flowing in the heat exchanger, and thus improve the working efficiency of the heat exchange tube;

[0027] 3. The brush sweeps the impurities clamped in the filter screen holes out of the filter screen holes, so that the impurities are separated from the filter screen holes and then pushed out of the filter screen holes by the scraper, thereby further reducing the possibility of filter screen hole blockage. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a schematic diagram of the overall structure of the embodiment of the present application.

[0029] Figure 2 is a sectional view of the embodiment of the present application, which embodies the internal structure of the heat exchanger.

[0030] Figure 3 is a schematic diagram of the internal structure of the inlet cover in the embodiment of the present application.

[0031] Figure 4 is an exploded view of the embodiment of the present application, which embodies the positional relationship between the heat exchange tube and the spiral conveying sheet and the connecting rod.

[0032] BRIEF DESCRIPTION OF DRAWINGS

[0033] 1, inlet cover; 11, inlet; 12, groove; 13, support plate; 2, fixed plate; 3, shell; 31, water inlet; 32, water outlet; 4, heat exchange tube; 41, spiral conveying sheet; 42, connecting rod; 421, felt; 43, collar; 431, plug-in slot; 5, outlet cover; 51, outlet; 6, filter screen; 7, limiting piece; 71, limiting rod; 72, limiting plate; 8, cleaning assembly; 81, impeller; 811, reinforcing rib; 82, scraper; 821, brush; 9, spiral baffle. DETAILED DESCRIPTION

[0034] The following will be described in detail in combination with the accompanying Figures 1-4 The present application is further described in detail.

[0035] The embodiment of the present application discloses a heat exchanger capable of preventing blockage.

[0036] Reference is made to Figure 1 , Figure 2 and Figure 3The application relates to an anti-blocking heat exchanger which comprises an inlet end cover 1, fixed plates 2, a shell 3, heat exchange pipes 4 and an outlet end cover 5. The inlet end cover 1 is fixedly connected with an inlet 11, and is installed on the end of the shell 3 through the cooperation of a flange and bolts; a filter screen 6 is arranged on the side of the inlet end cover 1 close to the end of the shell 3; and a limiting piece 7 and a cleaning assembly 8 are arranged in the inlet end cover 1. One fixed plate 2 is arranged at each end of the shell 3; the shell 3 is a hollow cylinder; a water inlet 31 and a water outlet 32 are fixedly and communicatively arranged on the side wall of the shell 3; a plurality of heat exchange pipes 4 are arranged in parallel to the length direction of the shell 3; and each heat exchange pipe 4 is fixedly connected between the two fixed plates 2. An outlet 51 is fixedly and communicatively arranged on the outlet end cover 5, and the installation mode of the outlet end cover 5 is consistent with that of the inlet end cover 1.

[0037] With reference to Figure 1 , Figure 2 and Figure 3 , before the heat exchanger is used, an operator first selects a filter screen 6 with a proper aperture according to the properties of liquid material, and then limits and installs the filter screen 6 on the inlet end cover 1 through the limiting piece 7. Hot water enters the shell 3 through the water inlet 31 and flows out of the shell 3 through the water outlet 32. Cold liquid material enters the inlet 11, and the impurities larger than the aperture of the filter screen 6 are blocked in the inlet end cover 1, so that the liquid material smoothly enters the inside of the heat exchange pipes 4 and exchanges heat with the hot water in the shell through the pipe wall of the heat exchange pipe 4. When the heat exchanger works, the cleaning assembly 8 in the inlet end cover 1 continuously cleans the impurities blocked on the aperture of the filter screen 6, so that the possibility of blocking of the aperture of the filter screen 6 is reduced.

[0038] With reference to Figure 2 and Figure 3 , the limiting piece 7 in the embodiment comprises a limiting rod 71 and a limiting plate 72. A recess 12 is formed on the side wall of the inlet end cover 1 towards the shell 3, and the recess 12 is located close to the inner wall of the inlet end cover 1 and extends to the inner wall. Two recesses 12 are symmetrically arranged on the side wall of the inlet end cover 1 with the axial direction of the inlet end cover 1 as the center. The limiting rod 71 is fixedly arranged in the corresponding recess 12 in parallel to the feeding direction. The limiting plate 72 is rotatably arranged at the end of the limiting rod 71, and the length direction of the limiting plate 72 is perpendicular to that of the limiting rod 71. When the filter screen 6 with a proper aperture is inserted into the inside of the inlet end cover 1, the two limiting plates 72 are relatively rotated, and the limiting plates 72 abut against the side wall of the filter screen 6, so that the filter screen 6 is limited in the inlet end cover 1.

[0039] With reference to Figure 2 and Figure 3A cross-shaped support plate 13 is fixedly provided on the side wall of the inlet cover 1 near the feed port 11, and the support plate 13 is provided in an arc shape on the side facing the feed port 11. The cleaning assembly 8 includes an impeller 81 and a scraper 82. The impeller 81 is rotatably provided on the side of the support plate 13 facing the housing 3 through a bearing, and the end of the impeller 81 with a small diameter faces the feed port 11. The scraper 82 is perpendicular to the axial direction of the impeller 81 and is fixedly provided at the end of the impeller 81 away from the support plate 13. A reinforcing rib 811 is fixedly provided at the connection between the scraper 82 and the rotating shaft of the impeller 81. A brush 821 is fixedly provided on the side of the scraper 82 facing the filter screen 6. The brush 821 contacts the mesh surface of the filter screen 6, and the length of the scraper 82 and the brush 821 is adapted to the size of the filter screen.

[0040] Reference Figure 2 and Figure 4 In order to improve the service life of the heat exchange tube 4, a spiral conveying piece 41 is slidably inserted into each heat exchange tube 4, and a connecting rod 42 is fixedly inserted into each spiral conveying piece 41 along the axial direction. Several connecting rods 42 are arranged along the circumference of the spiral conveying piece 41, and a felt 421 is fixedly provided on the side of each connecting rod 42 facing the inner wall of the heat exchange tube 4. The felt 421 contacts the inner wall of the heat exchange tube 4. In this embodiment, four connecting rods 42 are distributed on each spiral conveying piece 41 near the edge, and the four connecting rods 42 extend out of the outer wall of the end of the heat exchange tube 4 and are fixedly connected with a collar 43. The collar 43 and the heat exchange tube 4 are coaxially arranged. The end of the collar 43 extending out of the fixed plate 2 toward the heat exchange tube 4 is provided with a plug-in groove 431, and the plug-in groove 431 is plugged into the tube end of the heat exchange tube 4.

[0041] Reference Figure 2 Figure 4 In order to improve the heat exchange efficiency of the heat exchange tube 4, a spiral baffle 9 is fixedly provided on the inner wall of the shell 3 along its length direction, and the spiral baffle 9 is fixedly sleeved on several heat exchange tubes 4.

[0042] The implementation principle of the anti-blocking heat exchanger of the embodiment of the present application is as follows: before the heat exchanger is used, the operator first selectively installs a filter screen 6 of appropriate aperture according to the properties of the liquid material, rotates the two limit plates 72 relative to each other, and makes the limit plates 72 contact the side walls of the filter screen 6, so that the filter screen 6 is limitedly installed on the inlet cover 1. Hot water enters the interior of the shell 3 through the water inlet 31 and flows along the guidance of the spiral baffle 9 until it flows out of the shell 3 from the water outlet 32. The cold liquid material enters from the feed port 11, and the impurities larger than the aperture are blocked by the filter screen 6 in the inlet cover 1, and smoothly enters the interior of the several heat exchange tubes 4 and exchanges heat with the hot water in the shell through the tube wall of the heat exchange tube 4.

[0043] When the heat exchanger is in operation, liquid material continuously impacts on the guide vanes of the impeller 81, so that the impeller 81 rotates, and the rotating impeller 81 drives the scraper 82 to rotate with the end of the rotating shaft of the impeller 81 as the rotation center. After the scraper 82 rotates one circle, the scraping path of the scraper 82 covers all the mesh holes of the filter screen 6, and in the process of rotation, the scraper 82 pushes the impurities clogging the mesh holes of the filter screen 6 away from the mesh holes, thereby reducing the possibility of clogging of the mesh holes of the filter screen 6.

[0044] The above are preferred embodiments of the present application, and do not limit the protection scope of the present application, therefore, equivalent changes made on the basis of the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A kind of anti-blocking heat exchanger, including shell (3), fixed plate (2), heat exchange pipe (4), inlet end cover (1), outlet end cover (5) and filter screen (6), it is characterized in that, The filter screen (6) covers all the heat exchange pipes (4) and is detachably arranged in the inlet end cover (1), the support plate (13) is arranged in the inlet end cover (1) close to the inlet (11), the impeller (81) is arranged on the side of the support plate (13) facing the fixed plate (2), the axial direction of the impeller (81) is perpendicular to the end surface of the filter screen (6), and the end portion of the impeller (81) away from the support plate (13) is provided with a scraper (82), the scraper (82) is parallel to the end surface of the filter screen (6) and abuts against the filter screen (6).

2. The anti-blocking heat exchanger according to claim 1, wherein The length of the scraper (82) is adapted to the size of the filter screen (6), when the scraper (82) rotates one circle, the scraping path of the scraper (82) covers all the mesh holes of the filter screen (6).

3. A heat exchanger according to claim 2, wherein The side of the scraper (82) facing the filter screen (6) is provided with a brush (821), and the brush (821) abuts against the filter screen (6).

4. The anti-blocking heat exchanger according to claim 2, wherein The connecting part of the scraper (82) and the rotating rod is provided with a reinforcing rib (811).

5. The anti-blocking heat exchanger according to claim 1, wherein Each of the heat exchange pipes (4) is coaxially provided with a spiral conveying piece (41), and the blade of the spiral conveying piece (41) abuts against the inner wall of the heat exchange pipe (4).

6. A heat exchanger according to claim 5, wherein The spiral conveying piece (41) is inserted and matched with the heat exchange pipe (4), and the connecting rod (42) is arranged on the spiral conveying piece (41) in the axial direction, the end portion of the connecting rod (42) close to the inlet end cover (1) is connected with a sleeve ring (43), and the sleeve ring (43) is sleeved on the end portion of the corresponding heat exchange pipe (4) extending out of the fixed plate (2).

7. A heat exchanger according to claim 6, wherein Each of the connecting rods (42) is provided with a felt (421) on the side facing the inner wall of the heat exchange pipe (4), and the felt (421) is arranged in abutment with the inner wall of the heat exchange pipe (4).

8. The anti-blocking heat exchanger of claim 1, wherein The helical baffle (9) is arranged on the inner wall of the shell (3) in the length direction, and the helical baffle (9) is arranged in the shell (3) in the length direction.

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