A cleaning device for plate evaporative condenser

Abstract

The cleaning device for a plate evaporative condenser of the present invention comprises a heat exchange plate, a rotating scraper assembly and a scraper shaft. Both ends of the scraper shaft are fixed to an outer frame bracket by means of bearing seats, and the outer frame bracket is welded and fixed to the outer shell of an evaporation tower. The scraper shaft passes through a plate bundle composed of a plurality of heat exchange plates, an eccentric hole is opened at the center axis of the heat exchange plate, and a pressure ring is used to further ensure that the scraper shaft and the eccentric hole are coaxial. One end of the scraper shaft is connected to an electric drive device through a coupling. The rotating scraper assembly is arranged at the interval between two heat exchange plates. The cleaning device of the present invention has a simple structure and is convenient for later maintenance. It can be used for cleaning the heat exchange plates inside a closed evaporation tower without stopping the machine for processing, thereby improving the working efficiency of the evaporation tower.

Description

Technical Field

[0001] The invention relates to the technical field of internal cleaning of a closed evaporation tower, and in particular to a cleaning device for a plate evaporative condenser. Background Art

[0002] When the closed evaporation tower is used for industrial wastewater treatment, especially in the treatment of high-salt and high-organic industrial wastewater, there are high requirements for the heat exchange efficiency and structural strength of the evaporation tower. The plate-type heat exchanger has a small plate spacing and a small equivalent diameter of the flow channel, and has the advantages of high heat transfer efficiency and compact structure, so it is used inside the closed evaporation tower. When the plate-type heat exchanger is used for industrial wastewater treatment, due to the complex impurity composition in the wastewater, the temperature change will cause some components originally dissolved in the wastewater to be separated and deposited on the surface of the heat exchange plate. In addition, some suspended matter or process corrosion products in the wastewater are also easy to deposit on the surface of the heat exchange plate. With the continuous evaporation and condensation, these sediments gradually accumulate from the initial film-state dirt to highly adherent coking products, increase the total thermal resistance of the heat exchanger, reduce the heat transfer coefficient of the heat exchange plate, and seriously affect the heat transfer efficiency of the heat exchanger. Therefore, in order to reduce the design error of the heat exchanger and further ensure that the heat exchange efficiency of the closed evaporation tower meets the process requirements, the heat exchange plates inside the evaporation tower should be cleaned in time.

[0003] Since this evaporation tower system is a closed structure with multiple circuits for heat exchange, repeated shutdowns for cleaning will greatly reduce the system's processing efficiency. The cleaning methods commonly used, such as mechanical arm type and guide rail push type, have many disadvantages due to factors such as internal space limitations and the impact on the heat exchange area, and cannot meet the system's efficient cleaning requirements. Summary of the invention

[0004] The present invention provides a cleaning device for a plate evaporative condenser, which can solve the above technical problems.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A cleaning device for a plate evaporative condenser comprises a heat exchange plate, a rotating scraper assembly and a scraper shaft, wherein both ends of the scraper shaft are supported and fixed on an outer frame bracket by a bearing seat, and the outer frame bracket is welded and fixed on an evaporation tower shell;

[0007] The scraper shaft passes through a plate bundle composed of multiple heat exchange plates, an eccentric hole is opened at the center axis of the heat exchange plate, and a pressure ring is used to further ensure that the scraper shaft and the eccentric hole are coaxial;

[0008] One end of the bracket shaft is connected to the electric drive device through a coupling;

[0009] The rotating scraper plate assembly is arranged at a position where two heat exchange plates are spaced apart.

[0010] Furthermore, the rotating scraper assembly includes a cleaning rubber strip, a supporting scraper, a positioning sleeve, and a locking nut;

[0011] A keyway is formed on the positioning sleeve, and the keyway and the key on the bracket shaft are interference fit to axially position the rotating bracket assembly;

[0012] The two supporting slats are symmetrically welded on the positioning shaft sleeve, and the cleaning rubber strip is fixed between the two supporting slats by using a locking nut.

[0013] Further, multiple rotating bracket assemblies are symmetrically installed, and the narrow end of the supporting bracket is vertically upward as 0°, if the number of rotating bracket assemblies is odd, the starting angle is 0°, if the number of rotating bracket assemblies is even, the starting angle is set to 180°;

[0014] The axial position and spacing of each rotating bracket assembly are indirectly determined by the installation position of the heat exchange plate.

[0015] Furthermore, the bearing seat is positioned and locked on the outer frame bracket by connecting bolts.

[0016] Furthermore, it also includes an inner frame bracket, and the upper and lower frames of the inner frame bracket are both provided with equally spaced slots, and the heat exchange plates are inserted into the slots to fix the relative positions.

[0017] Furthermore, the width of the positioning sleeve is smaller than the gap between the heat exchange plates, thereby indirectly fixing the axial position of the rotating scraper assembly.

[0018] Furthermore, a laser welding pressing edge is performed on the heat exchange plate along the circumference of the eccentric hole to ensure its sealing.

[0019] Furthermore, the electric drive device is driven by an electric motor.

[0020] Furthermore, it also includes a sealing cover, which is used to dynamically seal the scraper shaft on the evaporation tower shell, and the sealing end cover is fastened to the flange interface bolts on the evaporation tower shell.

[0021] It can be known from the above technical scheme that the cleaning device for plate evaporative condenser of the present invention has multiple groups of rotating scraper assemblies fixed on the scraper shaft, and each rotating scraper assembly is arranged between two heat exchange plates; the driving device drives the multiple groups of rotating scraper assemblies to perform synchronous full-circle rotation around the scraper axis through the scraper shaft, and utilizes the friction between the cleaning rubber strips in the scraper assembly and the heat exchange plate to scrape off the dirt attached to the surface of the heat exchange plate. The above scheme is adopted to arrange the scraper assemblies symmetrically because the friction coefficient between the cleaning rubber strip and the heat exchange plate is uncertain due to the difference in dirt generation area or density. In this case, the dynamic rotor balance is achieved as much as possible, which can effectively reduce the centrifugal inertia force of the scraper assembly on the scraper shaft, and avoid problems such as excessive noise, vibration or scraper shaft damage caused by excessive centrifugal inertia.

[0022] The cleaning device in the technical solution of the present invention has a simple structure and is convenient for later maintenance. It can be used to clean the heat exchange plates inside a closed evaporation tower without stopping the tower for processing, thereby improving the working efficiency of the evaporation tower.

[0023] Compared with the prior art, the present invention has significant technical effects:

[0024] The structural design of the present invention is relatively simple and is applied to the cleaning of the heat exchange plates inside a closed evaporation tower. It can realize multiple scraping and cleaning of the surface of the heat exchange plates without stopping the system, thereby solving the problem of reduced heat exchange efficiency of the system caused by the surface structure of the heat exchanger, and avoiding repeated start and stop of the system, thereby directly improving the service life of the heat exchange plates and the economic benefits of the closed evaporation system. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a three-dimensional structural diagram of the present invention;

[0026] Figure 2 is a top view of the present invention;

[0027] Figure 3 It is a schematic diagram of the relative positions of some parts of the present invention;

[0028] Figure 4 It is a three-dimensional structural diagram of the cleaning component in the present invention;

[0029] Figure 5 It is a schematic diagram of the middle key connection of the present invention;

[0030] Figure 6 The invention is a schematic diagram of the installation structure of a rotary scraper assembly and a scraper shaft for a plate evaporative condenser. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0032] like Figure 1 , Figure 2 As shown, the present invention proposes a cleaning device for a plate evaporative condenser, comprising: a bearing seat 3, a rotating scraper assembly 5, a scraper shaft 9, a pressure ring 4, and an outer frame bracket 2, wherein the outer frame bracket 2 is welded and fixed to the evaporation tower shell 1, and both ends of the scraper shaft 9 are supported and fixed to the outer frame bracket 2 by the bearing seat 3, and the bearing seat 3 is positioned and locked on the outer frame bracket 2 by the connecting bolt 19; the scraper shaft 9 is dynamically sealed on the evaporation tower shell 1 by the sealing end cover 20, and the sealing end cover 20 is bolted and connected to the flange interface 21 on the evaporation tower shell 1;

[0033] One end of the scraper shaft 9 is connected to an electric drive device 11 through a coupling 10. The electric drive device 11 can be driven by an electric motor or a motor according to actual production needs.

[0034] In the above embodiment, as shown in the attached Figure 3 , Figure 6 As shown, an eccentric hole 12 is opened at the center axis position of the heat exchange plate 6, and a laser welding pressing edge is performed on the heat exchange plate 6 along the circumference of the eccentric hole 12 to ensure its sealing; the scraper shaft 9 passes through the plate bundle composed of multiple heat exchange plates 6, and the pressing ring 4 is used to further ensure that the scraper shaft 9 is coaxial with the eccentric hole 12; the eccentric hole 12 is mainly used to position the rotating shaft and the rotating scraper assembly. Since the rotating scraper assembly has a certain length, the area swept by the cleaning strip during one rotation is the cleaning area, and the rotation center of the rotating shaft and the rotating scraper assembly is the center of the eccentric hole. The eccentric distance of the eccentric hole is determined by certain calculations to ensure that the cleaning area is maximized without affecting the upper structure of the evaporation tower.

[0035] The plurality of rotating slat assemblies 5 are symmetrically installed, with the narrow end of the supporting slat vertically upward counted as 0°. If the starting angle of an odd number of the rotating slat assemblies 5 is 0°, the starting angle of an even number of the rotating slat assemblies 5 is set to 180°. The axial position and spacing of each rotating slat assembly 5 are indirectly determined by the installation position of the heat exchange plate 6.

[0036] In the above embodiment, as shown in the attached Figure 4 , Figure 5As shown, the rotating scraper assembly includes a cleaning rubber strip 16, a supporting scraper 15, a positioning sleeve 14, and a locking nut 17. A key groove 13 is opened on the positioning sleeve 14, and the key groove 13 and the key 18 on the scraper shaft 9 are interference fit to radially lock and fix the rotating scraper assembly 5; the two supporting scrapers 15 are symmetrically welded on the positioning sleeve 14, and the cleaning rubber strip 16 is fixed between the two supporting scrapers 15 using four locking nuts 17.

[0037] In the above embodiment, as shown in the attached Figure 2 As shown, the upper and lower frames of the inner frame bracket 7 are both provided with equally spaced slots 8, and the heat exchange plates 6 are inserted into the slots 8 to fix the relative positions, and the rotating scraper assembly 5 is arranged at the interval between the two heat exchange plates 6, and the width of the positioning sleeve 14 is slightly smaller than the gap between the heat exchange plates 6, thereby indirectly fixing the axial position of the rotating scraper assembly 5, that is, the axial position of the scraper assembly can be fixed by using the heat exchange plate spacing.

[0038] When working, the driving device 11 transmits the driving force to the scraper shaft 9 to make it rotate at a certain speed; the scraper assembly 5 is locked axially along the scraper shaft 9 by the positioning sleeve 14, and the rotation of the scraper shaft 9 will drive the scraper assembly 5 to make a full-circle rotation. The friction between the cleaning rubber strip and the heat exchange plate 6 is used to scrape the film-state dirt on the surface of the plate, and the free-state dirt scraped off is washed away by the water flow in the shell of the two heat exchange plates. In order to avoid the continuous superposition of multiple layers of film-state dirt, which makes the effective distance between the two heat exchange plates too small, resulting in excessive friction between the cleaning rubber strip and the heat exchange plate, the key connection between the positioning sleeve 14 and the scraper shaft 9 fails, and the full-circle rotation frequency of the scraper assembly 5 is adjusted to avoid continuous accumulation of dirt.

[0039] The structural design of the present invention is relatively simple and is applied to the cleaning of the heat exchange plates inside a closed evaporation tower. It can realize multiple scraping and cleaning of the surface of the heat exchange plates without stopping the system, thereby solving the problem of reduced heat exchange efficiency of the system caused by the surface structure of the heat exchanger, and avoiding repeated start and stop of the system, thereby directly improving the service life of the heat exchange plates and the economic benefits of the closed evaporation system.

[0040] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cleaning device for a plate evaporative condenser, comprising a heat exchange plate (6), characterized in that It also includes a rotating scraper assembly (5) and a scraper shaft (9), wherein both ends of the scraper shaft (9) are supported and fixed on an outer frame bracket (2) by a bearing seat (3), and the outer frame bracket (2) is welded and fixed on an evaporation tower shell (1); The plate bracket shaft (9) passes through a plate bundle composed of a plurality of heat exchange plates (6), an eccentric hole (12) is opened at the center axis of the heat exchange plate (6), and a pressure ring (4) is used to further ensure that the plate bracket shaft (9) and the eccentric hole (12) are coaxial; One end of the bracket shaft (9) is connected to an electric drive device (11) via a coupling (10); The rotating scraper assembly (5) is arranged at a position spaced apart from two heat exchange plates (6); The bearing seat (3) is positioned and locked on the outer frame bracket (2) by means of connecting bolts (19); It also includes an inner frame bracket (7), and the upper and lower frames of the inner frame bracket (7) are both provided with equally spaced slots (8), and the heat exchange plates (6) are inserted into the slots (8) to fix the relative positions; The rotating scraper assembly (5) comprises a cleaning rubber strip (16), a supporting scraper (15), a positioning sleeve (14), and a locking nut (17); A keyway (13) is formed on the positioning sleeve (14), and the keyway (13) and a key (18) on the bracket shaft (9) are interference-fitted to axially position the rotating bracket assembly (5); Two supporting plates (15) are symmetrically welded on the positioning sleeve (14), and a cleaning rubber strip (16) is fixed between the two supporting plates (15) by a locking nut (17); The plurality of rotating bracket assemblies (5) are symmetrically installed, and the narrow end of the supporting bracket is vertically upward, which is counted as 0°. If the starting angle of the odd number of rotating bracket assemblies (5) is 0°, the starting angle of the even number of rotating bracket assemblies (5) is set to 180°; The axial position and spacing of each rotating bracket assembly (5) are indirectly determined by the installation position of the heat exchange plate (6).

2. The cleaning device for a plate evaporative condenser according to claim 1, characterized in that: The width of the positioning sleeve (14) is smaller than the gap between the heat exchange plates (6), thereby indirectly fixing the axial position of the rotating bracket assembly (5).

3. The cleaning device for a plate evaporative condenser according to claim 1, characterized in that: The edge of the heat exchange plate (6) is laser welded along the circumference of the eccentric hole (12) to ensure its sealing performance.

4. The cleaning device for a plate evaporative condenser according to claim 1, characterized in that: The electric drive device (11) is a motor.

5. The cleaning device for a plate evaporative condenser according to claim 1, characterized in that: It also comprises a sealing end cover (20), which is used to dynamically seal the scraper shaft (9) on the outer shell of the evaporation tower. The sealing end cover (20) is bolted and connected to the flange interface (21) on the outer shell of the evaporation tower (1).

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