Automatic heat exchange tube cleaning device adopting automatic rotating bearing

Abstract

The utility model discloses an automatic heat exchange tube cleaning device adopting an automatic rotating bearing, and relates to the field of heat exchanger cleaning devices. A bearing applied in an automatic cleaning element of a factory heat exchanger is short in service life due to abrasion, the automatic cleaning element needs to avoid too high speed, and the rotating speed must be limited. A shaft sleeve is integrally arranged at the upper end of a bearing fixing piece, a shaft hole is formed in the middle of the shaft sleeve, the bearing rotating piece is placed on the bearing fixing piece and sleeved on the shaft sleeve, and the cleaning main shaft sequentially penetrates through the shaft hole of the bearing rotating piece and the shaft hole of the shaft sleeve from top to bottom and penetrates out of the lower end of the bearing fixing piece. The lower end of the cleaning main shaft is provided with a connecting hole, and the upper end of the cleaning main shaft is integrally provided with a shaft cap. Due to the friction limiting effect of the bearing rotating piece, the rotating speed of the cleaning main shaft is controlled, abrasion of the cleaning element to the pipe wall of the heat exchanger due to too high speed is avoided, the service life is prolonged, and the maintenance cost is reduced.

Description

Technical Field

[0001] The utility model relates to the field of heat exchanger cleaning devices, in particular to an automatic heat exchange tube cleaning device using an automatic rotating bearing. Background Technique

[0002] During the industrial chemical production process in factories, the dirt formed on the inner wall of the heat exchanger will seriously affect the heat transfer coefficient, increase energy consumption, and affect production efficiency and production capacity.

[0003] At present, the cleaning methods for heat exchanger pipes are mainly chemical cleaning and mechanical cleaning. The crystal scale is relatively hard. For calcium sulfate, sodium sulfide, and silicate mud scale, even a twist drill is required. Calcium sulfate, silicate scale, carbonized scale, etc. may cause secondary pollution. Due to the great difference in solutes and the non-uniformity of dirt compared with water scale, there is no universal descaling agent, and the price is high, increasing production costs. For some production products, additional chemical descaling agents cannot be added. The pipe scaling speed is fast, and the risk of pipe blockage is high, so periodic shutdown for water washing is often required. The water washing method can only be used for crystal scale that is easily soluble in water. In some factories, manual steel pipe poking and washing are used, which not only has a high labor intensity, delays production, has a large cleaning pollution and low cleanliness, but also easily scratches the inner wall surface of the pipe. Using high-pressure water guns and ultra-high-pressure jet cleaning not only has a low cleaning cleanliness, cannot remove the underlying hard scale, but also has a high cost and a long shutdown time. Electro, magnetic, and ultrasonic cleaning can only slow down the dirt formation speed and cannot solve the fundamental problem. General rotating spiral and plastic spiral cleaning cannot remove hard dirt.

[0004] Currently, the bearings used in the automatic cleaning elements of factory heat exchangers are generally an elevated structure and a low-elevated pipe orifice rack. The two bearings currently used rely on the spring structure to generate reciprocating motion for the entire cleaning element to achieve the cleaning effect, but the connected springs are prone to failure and cause movement blockage. Using the flow energy of the fluid in the evaporator tube pass and the secondary steam energy as the automatic cleaning power, the fluid forms a water flow in the corresponding direction through the diversion orifice rack, driving the spiral multi-dimensional cleaning movement in the heating tube, thereby completing the cleaning of the pipe. Due to the problem of wear life, the automatic cleaning element needs to avoid too fast speed, so the automatic cleaning rotation must be restricted. Content of the Utility Model

[0005] The technical problem to be solved and the technical task proposed by the utility model are to improve and perfect the existing technical solution, and provide an automatic heat exchange tube cleaning device using an automatic rotating bearing, aiming to avoid the too fast multi-dimensional movement of the cleaning element, reduce the wear of the cleaning element on the inner wall of the heat exchanger, and improve the service life. To this end, the utility model adopts the following technical solutions.

[0006] An automatic cleaning device for heat exchange tubes using an automatic rotating bearing, comprising a cleaning main shaft for connecting with a cleaning spiral, a bearing fixing member for connecting and fixing at the end of the heat exchange tube, and a bearing rotating member for restricting and reducing the rotation speed of the cleaning spiral. The bearing fixing member serves as a diversion nozzle bracket, with a bushing provided at its upper end and a shaft hole in the middle of the bushing. The bearing rotating member is disposed above the bearing fixing member and sleeved outside the bushing. Fluid inlets are provided on the upper left and right sides of the upper part of the bearing fixing member. The middle and lower part of the bearing fixing member is a vertically penetrating cavity, and the fluid inlets communicate with the cavity. The cleaning main shaft sequentially passes through the bearing rotating member, the shaft hole of the bushing, and the cavity from top to bottom, and passes out from the lower end of the bearing fixing member. A limiting shaft cap is provided at the upper end of the cleaning main shaft, and a connection hole for connecting with the end hook of the cleaning spiral is provided at the lower end of the cleaning main shaft. When fluids enter the cavity through the fluid inlets, they form water flows in a certain direction through the diversion nozzle bracket. These water flows act together with the fluids and secondary steam in the heat exchange tube, driving the cleaning main shaft and the cleaning spiral to perform multi-dimensional cleaning movements inside the heat exchange tube, effectively removing dirt and deposits in the pipeline. Since the bearing rotating member is not axially and radially fixed, only limited, it can automatically rotate under external forces and provide a reverse friction limiting effect, controlling the rotation speed of the cleaning main shaft, thus avoiding the wear of the cleaning elements on the heat exchanger tube wall caused by excessive speed, increasing the service life, and reducing the maintenance cost.

[0007] As a preferred technical means: The shaft cap is sleeved outside the bearing rotating member, and the shaft cap and the cleaning main shaft are of an integral structure. This structure can prevent the bearing rotating member from detaching. When the shaft cap rotates with the cleaning main shaft, there is rubbing between its inner wall and the bearing rotating member, which can better reduce the rotation speed of the cleaning main shaft. The integral structure of the shaft cap and the cleaning main shaft can reduce the number of parts and the manufacturing cost.

[0008] As a preferred technical means: The bearing rotating member is a cylindrical ring, the inner diameter of the cylindrical ring is 5 - 10 mm larger than the outer diameter of the bushing, and there is a gap between the inner side wall of the shaft cap and the outer side wall of the bearing rotating member. The structure of the bearing rotating member is simple and convenient to install. During the cleaning movement, this structure allows the bearing rotating member to have a certain shaking space, achieving the speed reduction effect of collision and friction.

[0009] As a preferred technical means: The bearing fixing member includes a fixing part and a supporting part provided on the fixing part. The upper end surface of the supporting part is a supporting surface for supporting the lower end of the bearing rotating member. The front and rear sides of the supporting surface are integrally connected to the front and rear sides of the upper end of the fixing part through supporting arms. The upper part of the bushing is located above the supporting surface, and the lower part of the bushing is located below the supporting surface. The bushing and the supporting part are of an integral structure. The structure is simple, the supporting structure is reliable, and the integral structure has high strength.

[0010] As a preferred technical means: the fixing part is annular, with a wall thickness of 1.8 - 2.5 mm. An outward flange is provided on the outer periphery of the upper end of the fixing part, and the outer diameter of the flange is 3 - 10 mm larger than the inner radius of the inner wall of the heat exchange tube. The side surface of the fixing part is in interference fit with the inner wall of the heat exchange tube. This structure can effectively realize the connection and fixation with the end of the heat exchange tube.

[0011] As a preferred technical means: a plurality of cutting slots radially penetrating through and opening downward are provided at the lower part of the fixing part. By setting the cutting slots, the fixing part has a certain radial compression elasticity, which is convenient for installation and fixation at the end of the heat exchange tube.

[0012] As a preferred technical means: the left - right width of the supporting part is the same as the outer diameter of the bushing. The outer side surface of the supporting arm and the outer side surface of the flange are the same cylindrical arc surface, and the inner side surface of the supporting arm and the inner side surface of the fixing part are the same cylindrical arc surface. The supporting part adopts a thin - wall structure, so that the fluid inlet size is larger, which is more convenient for fluid passage. Moreover, the wall thickness of the supporting arm is relatively thick, which can provide sufficient structural strength and has a good supporting effect.

[0013] Beneficial effects: By connecting the cleaning spiral, the cleaning spiral performs long - term online multi - dimensional cleaning movement inside the heat exchange tube, effectively removing dirt and deposits in the pipeline. Through the friction limiting effect of the bearing rotating part, the rotation speed of the cleaning main shaft can be effectively controlled, thus avoiding the wear of the cleaning element on the heat exchanger tube wall caused by too fast speed, improving the service life and reducing the maintenance cost. Brief Description of the Drawings

[0014] Figure 1 is a schematic structural diagram of the present utility model.

[0015] Figure 2 is the present utility model Figure 1 A - A cross - sectional view in the present utility model.

[0016] Figure 3 is a connection schematic diagram of the bearing fixing part and the bearing rotating part in the present utility model.

[0017] In the figure: 1. Bearing fixing part; 2. Bearing rotating part; 3. Cleaning main shaft; 4. Bushing; 5. Axial cap; 101. Supporting part; 102. Flange; 103. Cutting slot; 301. Connection hole. Specific Embodiments

[0018] The technical solutions of the present utility model will be further described in detail below with reference to the accompanying drawings of the specification.

[0019] Such as Figures 1-3As shown in the figure, an automatic cleaning device for heat exchange tubes using an automatic rotating bearing includes a cleaning main shaft 3 for connecting with a cleaning spiral, a bearing fixing member 1 for connecting and fixing at the end of the heat exchange tube, and a bearing rotating member 2 for restricting and reducing the rotation speed of the cleaning spiral. The bearing fixing member 1 serves as a diversion nozzle bracket, and its upper end is provided with a bushing 4. An axial hole is provided in the middle of the bushing 4. The bearing rotating member 2 is arranged above the bearing fixing member 1 and sleeved on the bushing 4. The bearing fixing member 1 includes a fixing portion and a supporting portion 101 arranged above the fixing portion. The upper end surface of the supporting portion 101 is a supporting surface for supporting the lower end of the bearing rotating member 2. The front and rear sides of the supporting surface are integrally connected to the front and rear sides of the upper end of the fixing portion through supporting arms. The upper part of the bushing 4 is located above the supporting surface, and the lower part of the bushing 4 is located below the supporting surface. The bushing 4 and the supporting portion 101 are of an integral structure. The left and right sides of the supporting portion 101 of the bearing fixing member 1 are fluid inlets, and the middle and lower part of the bearing fixing member 1 is a vertically penetrating cavity. The fluid inlets communicate with the cavity. The fluid flows from the left and right sides and the upper sides on both sides of the supporting portion 101 to the middle and downward, and passes through the cavity downward. The cleaning main shaft 3 sequentially passes through the bearing rotating member 2, the axial hole of the bushing 4, and the cavity from top to bottom, and passes out from the lower end of the bearing fixing member 1. A limiting shaft cap 5 is provided at the upper end of the cleaning main shaft 3, and a connection hole 301 for connecting with the end hook of the cleaning spiral is provided at the lower end of the cleaning main shaft 3.

[0020] In order to limit the bearing rotating member 2, the shaft cap 5 is sleeved on the bearing rotating member 2, and the shaft cap 5 and the cleaning main shaft 3 are of an integral structure. This structure can limit the bearing rotating member 2 and prevent it from detaching. When the shaft cap 5 rotates with the cleaning main shaft 3, there is rubbing between its inner wall and the bearing rotating member 2, which can better reduce the rotation speed of the cleaning main shaft 3. The integral structure of the shaft cap 5 and the cleaning main shaft 3 can reduce the number of parts and the manufacturing cost.

[0021] In order to achieve the speed reduction effect of collision and friction, the bearing rotating member 2 is a cylindrical ring. The inner diameter of the cylindrical ring is 6 mm larger than the outer diameter of the bushing 4, and there is a gap between the inner side wall of the shaft cap 5 and the outer side wall of the bearing rotating member 2. The structure of the bearing rotating member 2 is simple and easy to install. During the cleaning movement, this structure allows the bearing rotating member 2 to have a certain shaking space to achieve the speed reduction effect of collision and friction.

[0022] In order to achieve the connection and fixation with the end of the heat exchange tube, the fixing portion is a circular ring with a wall thickness of 2 mm. An outward flange 102 is provided on the outer periphery of the upper end of the fixing portion. The outer diameter of the flange 102 is 4 mm larger than the inner wall radius of the heat exchange tube. The side surface of the fixing portion is in interference fit with the inner wall of the heat exchange tube. This structure can effectively achieve the connection and fixation with the end of the heat exchange tube.

[0023] For convenient installation and fixation, a cutting groove 103 that radially penetrates through and has an open lower end is provided at the lower part of the fixing portion. By providing the cutting groove 103, the fixing portion has a certain radial compression elasticity, facilitating installation and fixation at the end of the heat exchange tube. In this embodiment, there are a total of 2 cutting grooves 103, which are symmetrically arranged at 180 degrees.

[0024] To facilitate the passage of fluid, the left and right widths of the support portion 101 are the same as the outer diameter of the bushing 4. The outer side surface of the support arm and the outer side surface of the flange 102 are the same cylindrical arc surface, and the inner side surface of the support arm and the inner side surface of the fixing portion are the same cylindrical arc surface. The support portion 101 adopts a thin-walled structure, and the wall thickness of the support arm is relatively thick, which can provide sufficient structural strength and good support effect. The support portion 101 adopts a thin-walled structure, making the fluid inlet size larger and more facilitating the passage of fluid.

[0025] During installation, place the bearing rotating member 2 on the support surface of the bearing fixing member 1, and then pass the cleaning main shaft 3 through the bearing rotating member 2 and the bushing 4 from top to bottom in sequence, and pass through the lower end of the bearing fixing member 1 downward. The shaft cap 5 should be sleeved outside the bearing rotating member 2. Connect the end hook of the cleaning spiral to the connection hole 301 at the lower end of the cleaning main shaft 3. When the fluid enters the cavity through the fluid inlet, they form a water flow in a certain direction through the diversion pipe orifice frame. These water flows act together with the fluid and secondary steam in the heat exchange tube to drive the cleaning main shaft 3 and the cleaning spiral to perform multi-dimensional cleaning movements inside the heat exchange tube, effectively removing dirt and deposits in the pipeline. Due to the friction limiting effect of the bearing rotating member 2, the rotation speed of the cleaning main shaft 3 is controlled, thus avoiding the wear of the cleaning element on the heat exchanger tube wall caused by too fast speed, improving the service life, and reducing the maintenance cost.

[0026] The above Figures 1-3 The automatic cleaning device for heat exchange tubes using an automatic rotating bearing shown above is a specific embodiment of the present invention, which has already reflected the substantial features and progress of the present invention. According to the actual use needs, under the inspiration of the present invention, equivalent modifications can be made to its shape, structure, etc., and all are within the protection scope of this solution.

Claims

1. An automatic cleaning device for heat exchange tubes using an automatic rotating bearing, characterized in that: The invention comprises a cleaning spindle (3) for connecting with a cleaning spiral, a bearing fixing member (1) for connecting and fixing to the end of the heat exchange tube, and a bearing rotating member (2) for limiting and reducing the speed of the cleaning spiral rotation. The bearing fixing member (1) serves as a guide pipe mouth frame, and its upper end is provided with a shaft sleeve (4), and the middle of the shaft sleeve (4) is provided with a shaft hole. The bearing rotating member (2) is arranged on the upper side of the bearing fixing member (1) and is sleeved on the shaft sleeve (4). The upper left and right sides of the bearing fixing member (1) are provided with fluid inlets. The middle and lower parts of the bearing fixing member (1) are vertically penetrated cavities, and the fluid inlets are connected with the cavities. The cleaning spindle (3) passes through the shaft holes and cavities of the bearing rotating member (2), the shaft sleeve (4) in sequence from top to bottom, and passes out from the lower end of the bearing fixing member (1). The upper end of the cleaning spindle (3) is provided with a limit shaft cap (5), and the lower end of the cleaning spindle (3) is provided with a connecting hole (301) for connecting with the end hook of the cleaning spiral.

2. The automatic cleaning device for heat exchange tubes using automatic rotating bearings according to claim 1 is characterized in that: The shaft cap (5) is externally mounted on the bearing rotating part (2); the shaft cap (5) and the cleaning main shaft (3) are an integrated structure.

3. The automatic cleaning device for heat exchange tubes using automatic rotating bearings according to claim 2 is characterized in that: The bearing rotating part (2) is a cylindrical ring, the inner wall diameter of the cylindrical ring is 5-10 mm larger than the outer diameter of the shaft sleeve (4), and there is a gap between the inner wall of the shaft cap (5) and the outer wall of the bearing rotating part (2).

4. The automatic cleaning device for heat exchange tubes using automatic rotating bearings according to claim 3 is characterized in that: The bearing fixing member (1) comprises a fixing portion and a supporting portion (101) arranged on the fixing portion, the upper end surface of the supporting portion (101) being a supporting surface for supporting the lower end of the bearing rotating member (2), the front and rear sides of the supporting surface being integrally connected to the front and rear sides of the upper end of the fixing portion via a supporting arm, the upper portion of the shaft sleeve (4) being located above the supporting surface, the lower portion of the shaft sleeve (4) being located below the supporting surface, and the shaft sleeve (4) and the supporting portion (101) being an integral structure.

5. The automatic cleaning device for heat exchange tubes using automatic rotating bearings according to claim 4 is characterized in that: The fixing part is in the shape of a ring with a wall thickness of 1.8-2.5 mm. An outward flange (102) is provided on the outer periphery of the upper end of the fixing part. The outer diameter of the flange (102) is 3-10 mm larger than the inner diameter and inner wall radius of the heat exchange tube. The side surface of the fixing part is interference fit with the inner wall of the heat exchange tube.

6. The automatic cleaning device for heat exchange tubes using automatic rotating bearings according to claim 5 is characterized in that: The lower part of the fixing portion is provided with a plurality of cutting grooves (103) which penetrate radially and are open at the lower ends.

7. The automatic cleaning device for heat exchange tubes using automatic rotating bearings according to claim 6 is characterized in that: The left-right width of the support portion (101) is the same as the outer diameter of the shaft sleeve (4), the outer side surface of the support arm and the outer side surface of the flange (102) are the same cylindrical arc surface, and the inner side surface of the support arm and the inner side surface of the fixing portion are the same cylindrical arc surface.

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