On-line cleaning device outside heat exchanger tube

Abstract

The utility model discloses an on-line cleaning device outside a heat exchanger tube. The on-line cleaning device comprises a heat exchanger body and an on-line cleaning device, the heat exchanger body comprises a shell, a left tube plate, a right tube plate, a heat transfer tube, a shell pass medium inlet connector and a shell pass medium outlet connector. The on-line cleaning device comprises a motor, a lead screw, a lead screw nut, a bevel gear, a bearing, a scraper blade and a capillary brush. Dirt outside the pipe can be cleaned, the operation efficiency is improved, and the maintenance cost is saved; according to the utility model, on-line cleaning operation can be realized, shutdown is avoided, and production is not influenced; through flexible contact of the capillary tube brush, damage to the motor and the heat transfer tube due to jamming of the scraper structure during movement is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchanger cleaning, in particular to an online cleaning device for the outside of a heat exchanger tube. Background Art

[0002] The main transport and use media in the petroleum field and urban sewage treatment systems are crude oil, oily wastewater or sewage, which often have complex compositions. The media also contain a large amount of sulfates or carbonates including barium, strontium, magnesium, calcium, as well as paraffin, polymers and other substances. When these media are in heat exchange in the heat exchanger, they are easy to condense and adsorb on the surface of the pipe wall after contacting with the pipe wall. As time goes by, these substances continue to precipitate and adhere to the wall to form dirt. The longer the contact time, the easier it is to form dirt.

[0003] At present, conventional descaling methods include online cleaning, chemical dosing, manual mechanical descaling, etc., but they can never solve the scaling and blockage problems of heat exchangers. This makes the equipment very prone to blockage during operation, with a high equipment operation failure rate, poor reliability, shortened maintenance cycle, high operation and maintenance costs, and poor economic efficiency. Therefore, it is necessary to propose an online cleaning device for the outside of the heat exchanger tube to solve the above problems. Utility Model Content

[0004] The utility model aims to solve the deficiencies of the prior art and provide an online cleaning device for the outside of a heat exchanger tube to solve the problems of scaling and clogging of the heat exchanger.

[0005] The utility model provides an online cleaning device for the outside of a heat exchanger tube, comprising: a heat exchanger body and an online cleaning device; the heat exchanger body comprises a shell, a left tube sheet, a right tube sheet, a heat transfer tube, a shell-side medium inlet interface and a shell-side medium outlet interface; the left tube sheet and the right tube sheet are respectively arranged at two ends of the shell, the heat transfer tube is located inside the shell and connected between the left tube sheet and the right tube sheet; the shell-side medium inlet interface and the shell-side medium outlet interface are connected to the outer wall of the shell; the online cleaning device comprises a motor, a lead screw, a lead screw nut, a helical gear, a bearing, a scraper and a hair tube brush; the two ends of the lead screw are respectively connected between the left tube sheet and the right tube sheet through bearings, the output end of the motor and the lead screw are respectively provided with helical gears and the two are meshed; the lead screw is cooperatively connected with the lead screw nut, the lead screw nut is fixed on the scraper, the scraper is located inside the shell, a hair tube brush is arranged on the scraper corresponding to the heat transfer tube, and the heat transfer tube passes through the middle of the hair tube brush.

[0006] Furthermore, the motor is connected to a motor mounting cover plate, the motor mounting cover plate is fixed to the motor mounting flange by bolts and nuts, and the motor mounting flange is connected to the housing by a motor interface pipe.

[0007] Furthermore, guide rails are respectively arranged on the upper and lower parts of the shell, and sliders are slidably connected to the guide rails, and the top and bottom of the scraper are respectively connected to the sliders through mounting plates.

[0008] Furthermore, the shell-side medium inlet interface and the shell-side medium outlet interface are fixed to the shell by welding; the bearing is fixed to the left tube sheet and the right tube sheet by welding; the guide rail is fixed to the shell by welding; and the bristle brush is fixed to the scraper by welding.

[0009] Furthermore, the heat transfer tube is fixed between the left tube sheet and the right tube sheet by expansion or welding, and the heat transfer tube is a plain tube.

[0010] The utility model has the following beneficial effects: Compared with the prior art, the heat exchanger tube external online cleaning device provided by the utility model has the following advantages:

[0011] The prior art has no better method for dealing with the scaling outside the heat exchanger tubes, and the scaling outside the tubes is relatively difficult to clean. The utility model can realize the cleaning of the scaling outside the tubes, improve the operation efficiency, and save the maintenance cost.

[0012] The prior art can only stop the machine to clean the scale outside the heat exchanger tube, but the utility model can realize online cleaning operation without stopping the machine and affecting production.

[0013] The prior art uses a scraper structure, but it is easy to get stuck when in motion, thus damaging the motor and the heat transfer tube. The utility model avoids the above problem by using the flexible contact of the capillary brush. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 It is a schematic diagram of the external structure of the online cleaning device for the outer tube of a heat exchanger of the utility model;

[0016] Figure 2 The utility model is a schematic diagram of the internal structure of the online cleaning device for the outer tube of the heat exchanger.

[0017] Illustrations: 101-shell; 102-left tube sheet; 103-right tube sheet; 104-heat transfer tube; 105-shell medium inlet interface; 106-shell medium outlet interface; 201-motor; 202-motor mounting cover; 203-motor mounting flange; 204-motor interface pipe; 205-screw; 206-screw nut; 207-guide rail; 208-slider; 209-mounting plate; 210-bevel gear; 211-bearing; 212-scraper; 213-hair brush; 214-bolt; 215-nut. DETAILED DESCRIPTION

[0018] It should be noted that, in the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments. It should be noted that the following detailed descriptions are all illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those of ordinary skill in the art to which the present application belongs.

[0019] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0020] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in a variety of different forms and should not be interpreted as being limited to the embodiments described herein. It should be understood that these embodiments are provided to make the disclosure of the present application thorough and complete, and to fully convey the concepts of these exemplary embodiments to those of ordinary skill in the art. In the accompanying drawings, for clarity, the thickness of the layers and regions is enlarged, and the same reference numerals are used to represent the same devices, so their description will be omitted.

[0021] See also Figure 1 and Figure 2The embodiment of the utility model provides an online cleaning device for the outside of a heat exchanger tube, comprising: a heat exchanger body and an online cleaning device.

[0022] The heat exchanger body refers to the shell side, including a shell 101, a left tube sheet 102, a right tube sheet 103, a heat transfer tube 104, a shell side medium inlet interface 105 and a shell side medium outlet interface 106. The left tube sheet 102 and the right tube sheet 103 are respectively arranged at both ends of the shell 101. The heat transfer tube 104 is located inside the shell 101 and connected between the left tube sheet 102 and the right tube sheet 103; the heat transfer tube 104 is fixed between the left tube sheet 102 and the right tube sheet 103 by expansion or welding, and the heat transfer tube 104 is a bare tube.

[0023] The shell-side medium inlet interface 105 and the shell-side medium outlet interface 106 are connected to the outer wall of the shell 101 ; the shell-side medium inlet interface 105 and the shell-side medium outlet interface 106 are fixed to the shell 101 by welding.

[0024] The online cleaning device includes a motor 201 , a motor mounting cover 202 , a motor mounting flange 203 , a motor interface tube 204 , a lead screw 205 , a lead screw nut 206 , a guide rail 207 , a slider 208 , a mounting plate 209 , a bevel gear 210 , a bearing 211 , a scraper 212 and a hair brush 213 .

[0025] The bearing 211 is fixed to the left tube sheet 102 and the right tube sheet 103 by welding; the two ends of the lead screw 205 are rotatably connected between the left tube sheet 102 and the right tube sheet 103 through the bearing 211. The motor 201 is connected to the motor mounting cover plate 202, which is fixed to the motor mounting flange 203 by bolts 214 and nuts 215, and the motor mounting flange 203 is connected to the housing 101 through the motor interface pipe 204. The output end of the motor 201 and the lead screw 205 are respectively provided with helical gears 210 and the two are meshed; the lead screw 205 is connected with the lead screw nut 206, which is fixed to the scraper 212, which is located inside the housing 101, and the scraper 212 is provided with a hair tube brush 213 corresponding to the heat transfer tube 104, which is fixed to the scraper 212 by welding, and the heat transfer tube 104 passes through the middle of the hair tube brush 213. The hair tube brush 213 is in flexible contact with the wall of the heat transfer tube 104, which can not only effectively remove the dirt on the tube wall, but also avoid the movement jamming caused by rigid contact and damage to the motor 201 and the heat transfer tube 104. At the same time, there is a certain gap between the hair tube brush 213 and the wall of the heat transfer tube 104, making assembly more convenient.

[0026] Guide rails 207 are respectively arranged on the upper and lower parts of the housing 101, and the guide rails 207 are fixed to the housing 101 by welding. Slide blocks 208 are slidably connected to the guide rails 207, and the top and bottom of the scraper 212 are respectively connected to the slide blocks 208 through mounting plates 209. The motor 201 drives the lead screw 205, and the lead screw 205 drives the scraper 212 to move and clean dirt through the lead screw nut 206, and the guide rails 207 on both sides limit the scraper 212. This design has a simple structure, fewer moving parts, and the limit makes the scraper 212 move more stably to prevent it from getting stuck.

[0027] When the heat exchanger is running, a relatively dirty medium flows in the shell side. After the medium flows through the heat exchanger for a period of time, the medium is deposited and scaled on the outer side of the wall of the heat transfer tube 104. At this time, the online cleaning device can be activated: start the motor 201, and the motor 201 cooperates with the helical gear on the lead screw 205 through its own helical gear to drive the lead screw 205 to rotate forward. The forward rotation of the lead screw 205 drives the lead screw nut 206 and the scraper 212 to move linearly, so that the scraper 212 drives the hair tube brush 213 to move, and the hair tube brush 213 will move relative to the outer wall of the heat transfer tube 104 to remove the dirt on the wall of the heat transfer tube 104. The removed dirt will flow out of the heat exchanger with the flow of the medium. When the motor 201 rotates forward to a certain stroke, the bristle brush 213 approaches the right tube sheet 103, and the motor 201 stops, thus completing a forward stroke cleaning operation. Then the motor 201 is reversed, which drives the scraper 212 to make a linear motion in the opposite direction, completing the reverse cleaning operation. The forward and reverse cleaning operations are repeated for a period of time to completely remove the dirt. Through the forward and reverse rotation of the motor 201, the scraper 212 can repeatedly clean the wall of the heat transfer tube 104, which is not only more thorough in cleaning, but also has a good recovery effect on the deformation of the material during use.

[0028] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0029] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An online cleaning device for the outer tube of a heat exchanger, characterized in that: include: Heat exchanger body and online cleaning device; The heat exchanger body comprises a shell (101), a left tube sheet (102), a right tube sheet (103), a heat transfer tube (104), a shell-side medium inlet interface (105) and a shell-side medium outlet interface (106); the left tube sheet (102) and the right tube sheet (103) are respectively arranged at two ends of the shell (101); the heat transfer tube (104) is located inside the shell (101) and connected between the left tube sheet (102) and the right tube sheet (103); the shell-side medium inlet interface (105) and the shell-side medium outlet interface (106) are connected to the outer wall of the shell (101); The online cleaning device comprises a motor (201), a lead screw (205), a lead screw nut (206), a bevel gear (210), a bearing (211), a scraper (212) and a hair tube brush (213); two ends of the lead screw (205) are respectively connected between a left tube plate (102) and a right tube plate (103) through bearings (211); the output end of the motor (201) and the lead screw (205) are respectively provided with bevel gears (210), and the two are meshed; the lead screw (205) is matched and connected with the lead screw nut (206); the lead screw nut (206) is fixed on the scraper (212); the scraper (212) is located inside the housing (101); a hair tube brush (213) is provided on the scraper (212) corresponding to the heat transfer tube (104); the heat transfer tube (104) passes through the middle of the hair tube brush (213).

2. The online cleaning device for the outer tube of a heat exchanger according to claim 1, characterized in that: The motor (201) is connected to a motor mounting cover plate (202), the motor mounting cover plate (202) is fixed to a motor mounting flange (203) via bolts (214) and nuts (215), and the motor mounting flange (203) is connected to the housing (101) via a motor interface pipe (204).

3. The online cleaning device for the outer tube of a heat exchanger according to claim 2, characterized in that: Guide rails (207) are respectively arranged at the top and bottom of the housing (101), and a slider (208) is slidably connected to the guide rail (207). The top and bottom of the scraper (212) are respectively connected to the slider (208) via a mounting plate (209).

4. The online cleaning device for the outer tube of a heat exchanger according to claim 3, characterized in that: The shell-side medium inlet interface (105) and the shell-side medium outlet interface (106) are fixed to the shell (101) by welding; the bearing (211) is fixed to the left tube sheet (102) and the right tube sheet (103) by welding; the guide rail (207) is fixed to the shell (101) by welding; and the bristle brush (213) is fixed to the scraper (212) by welding.

5. The online cleaning device for the outer tube of a heat exchanger according to claim 4, characterized in that: The heat transfer tube (104) is fixed between the left tube plate (102) and the right tube plate (103) by expansion or welding, and the heat transfer tube (104) is a plain tube.

Images