Automatic cleaning power device for heat exchanger

Abstract

The utility model discloses an automatic cleaning power device for a heat exchanger, and relates to the field of heat exchanger cleaning devices. The cleaning modes of heat exchanger pipelines are mainly chemical cleaning and mechanical cleaning, most of the heat exchanger pipelines need to be shut down for cleaning, rotating screws are used for cleaning, and hard dirt cannot be removed through plastic screws. The cleaning device comprises a rotational flow rack, a shaft cap and a cleaning main shaft, the rotational flow rack comprises a central long shaft sleeve and supporting pieces, the lower end of each supporting piece is provided with a flow guide spiral piece, fluid penetrates through the space between the supporting pieces and then is guided through the flow guide spiral pieces, and the lower end of the cleaning main shaft is provided with a connecting port used for being connected with a cleaning spiral. On-line long-term rapid circumferential rotation and axial vibration of the cleaning spiral in the heat exchange tube are realized through the device by utilizing the flow velocity of the tube pass water body of the evaporator, the laminar flow of the water in the tube is changed into a turbulent flow state, the formation mechanism of incrustation scale is destroyed, scaling is prevented, and yield increase and energy conservation are facilitated.

Description

Technical Field

[0001] The utility model relates to the field of heat exchanger cleaning devices, in particular to an automatic cleaning power device for a heat exchanger. Background Art

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

[0003] At present, the cleaning methods of heat exchange tubes are mainly chemical cleaning and mechanical cleaning. Crystallized salt scale is hard in texture. For calcium sulfate, sodium sulfide and silicate scale, twist drills are even required. Calcium sulfate, silicate scale, carbonized scale, etc. may cause secondary pollution. Due to the wide variety of solutes, scale is different from the singleness of scale. There is no universal descaling agent, and the price is high, which increases production costs. Some production products cannot add additional chemical descaling agents, the scale formation speed of the pipeline is fast, the risk of pipe clogging is high, and periodic water washing is required. The water washing method can only be used for crystallized salt scale that is easily soluble in water. Using manual steel pipes for cleaning is not only labor-intensive, but also polluting and low in cleanliness during the cleaning process, and it is easy to scratch the inner wall surface of the tube. Using high-pressure water guns and ultra-high-pressure jet cleaning not only has low cleaning cleanliness, but also cannot remove the bottom hard scale, and the cost is high and the parking time is long. Electric, magnetic, and ultrasonic cleaning can only slow down the formation of scale, but does not solve the fundamental problem. Rotating spiral cleaning, plastic spirals cannot remove hard dirt. Utility Model Content

[0004] The technical problem to be solved and the technical task proposed by the utility model are to improve and perfect the existing technical solutions, and provide a heat exchanger automatic cleaning power device to achieve online automatic cleaning of the inner wall of the heat exchange tube and prevent scaling. To this end, the utility model adopts the following technical solutions.

[0005] A heat exchanger automatic cleaning power device includes a cyclone frame, a shaft cap and a cleaning spindle, the cyclone frame includes a central long shaft sleeve, support plates and guide spiral plates, the support plates are evenly distributed around the lower periphery of the central long shaft sleeve, a guide spiral plate is provided at the lower end of each support plate, the inner sides of the guide spiral plates and the support plates are integrated with the outer peripheral surface of the central long shaft sleeve, the upper end of the cleaning spindle passes through the vertical shaft hole of the central long shaft sleeve upward from the lower end of the central long shaft sleeve, the shaft cap is connected to the upper end of the central long shaft sleeve, the cleaning spindle can move axially and rotate circumferentially, and the lower end of the cleaning spindle is provided with a connection interface for connecting with the cleaning spiral. The online cleaning device is arranged at the upper end of the evaporator through the support plate. The flow energy of the water in the evaporator tube and the secondary steam energy are used as the automatic cleaning power. The flow velocity of the water passes through the space between the support plates and then changes the flow direction through the guide spiral plate to drive the cleaning spiral. The cleaning spiral can be rotated rapidly circumferentially and vibrated axially in the heat exchange tube for a long time. On the one hand, the tube wall is cleaned, and on the other hand, the laminar flow of water in the tube is changed to a turbulent state, which destroys the formation mechanism of scale, changes passive scale removal to active scale removal, and prevents scaling. Cleaning can be achieved without stopping the equipment, avoiding the loss caused by stopping for cleaning, strengthening the heat exchange capacity, and greatly improving the heat transfer coefficient of the heat exchange equipment, which is beneficial to increasing production and saving energy.

[0006] As a preferred technical means: the spiral rotation angle A of the guide spiral blade is ≤360 / N, where N is the number of support blades. This relative number ensures that there is no obstruction on the periphery of the cyclone frame from an axial perspective, simplifies the mold structure of the product, makes mold opening easier, and reduces mold opening costs.

[0007] As a preferred technical means: the number of N is 3-6. A reasonable number can enhance the disturbance effect of the liquid in the heat exchange tube, allowing the fluid to pass through the heat exchanger tube more evenly, thereby improving the cleaning effect and heat exchange efficiency.

[0008] As a preferred technical means: the distance between the upper outer side of the support sheet and the center of the vertical axial hole is 3-10mm larger than the inner wall radius of the heat exchange tube. During installation, the upper outer side of the support sheet is clamped on the end surface of the heat exchange tube as a support and limiting component, and the support sheet body and the guide spiral sheet are inserted into the heat exchange tube, so that the online cleaning device can be conveniently installed at the upper end of the heat exchanger.

[0009] As a preferred technical means: a plurality of friction pads are provided on the cleaning main shaft between the upper end of the cyclone frame and the upper end of the inner sleeve. Due to the existence of axial vibration, the friction pads can reduce the loss of the upper end of the cleaning main shaft and the upper end of the inner sleeve. When maintenance is required, only the friction pads need to be replaced.

[0010] As a preferred technical means: a gap is provided between the inner wall of the vertical shaft hole and the cleaning spindle. The gap facilitates installation and also facilitates the axial movement and circumferential rotation of the cleaning spindle.

[0011] As a preferred technical means: the inner wall diameter of the shaft cap is larger than the outer diameter of the friction pad and the central long shaft sleeve, and the gap between the two is larger than the gap between the inner wall of the vertical shaft hole and the cleaning spindle. This facilitates the installation of the shaft cap, and the shaft cap will not interfere with the outer wall of the central long shaft sleeve during installation.

[0012] As a preferred technical means: the shaft cap is provided with a radial through-hole, and the upper end of the cleaning spindle is correspondingly provided with a through hole, and the shaft cap and the cleaning spindle can be connected by passing a steel wire or a pin through the through-hole and the through hole, so as to conveniently connect the fixed shaft cap and the central long shaft sleeve.

[0013] As a preferred technical means: the lower part of the central shaft hole is provided with a coaxial expansion hole with a diameter larger than the central shaft hole. The coaxial expansion hole increases the gap, facilitates the installation of the cleaning spindle, and reduces the resistance to axial movement and circumferential rotation of the cleaning spindle when it tilts due to vibration.

[0014] As a preferred technical means: the lower end of the cleaning main shaft is provided with a connector with a diameter larger than the reaming hole, and the connector is provided with a hook head perforation as the connection interface connected to the end hook head of the cleaning spiral. The connector has a diameter larger than the reaming hole to facilitate axial movement and limiting, and the radial interface perforation facilitates the connection of the end steel wire of the cleaning spiral.

[0015] Beneficial effect: The flow energy and secondary steam energy of the water in the evaporator tube are used as the automatic cleaning power. The flow velocity of the water passes through the space between the support plates and then changes the flow direction through the guide spiral plate to drive the cleaning spiral. No external power is required to achieve long-term and continuous rapid circumferential rotation and axial vibration of the cleaning spiral in the heat exchange tube. On the one hand, the tube wall is cleaned, and on the other hand, the laminar flow of water in the tube is changed to a turbulent state, which destroys the formation mechanism of scale, changes passive scale removal to active scale removal, and prevents scaling. Cleaning can be achieved without stopping the equipment, avoiding the loss caused by stopping for cleaning, enhancing the heat exchange capacity, and greatly improving the heat transfer coefficient of the heat exchange equipment, which is beneficial to increasing production and saving energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the utility model.

[0017] Figure 2 It is a schematic diagram of the swirl frame in the utility model.

[0018] Figure 3 It is a cross-sectional schematic diagram of the utility model in an installed state.

[0019] In the figure: 1, cyclone frame; 2, shaft cap; 3, cleaning main shaft; 4, friction pad; 5, cleaning spiral; 6, heat exchange tube; 101, central long shaft sleeve; 102, support plate; 103, guide spiral plate; 104, expansion hole; 201, through-connecting hole; 301, connector; 302, hook head perforation. DETAILED DESCRIPTION

[0020] The technical solution of the utility model is further described in detail below in conjunction with the accompanying drawings of the specification.

[0021] like Figure 1-3 As shown, a heat exchanger automatic cleaning power device includes a cyclone frame 1, a shaft cap 2 and a cleaning main shaft 3. The cyclone frame 1 includes a central long shaft sleeve 101, a supporting sheet 102 and a guide spiral sheet 103. The support sheets 102 are evenly distributed around the lower periphery of the central long shaft sleeve 101, and a guide spiral sheet 103 is integrally provided at the lower end of each support sheet 102. In this example, the number of the guide spiral sheets 103 and the support sheets 102 is 4, and the inner sides of the guide spiral sheets 103 and the support sheets 102 are integral with the outer peripheral surface of the central long shaft sleeve 101. The distance between the outer side of the upper end of the support sheet 102 and the center of the vertical axial hole is 4 mm larger than the inner wall radius of the heat exchange tube. When the cleaning device is installed, the outer side of the upper end of the support sheet 102 is stuck on the end surface of the heat exchange tube 6 as a supporting and limiting component, and the main part of the support sheet 102 and the guide spiral sheet 103 are inserted into the heat exchange tube 6, so that the online cleaning device can be conveniently arranged at the upper end of the heat exchanger, and the main part of the support sheet 102 and the guide spiral sheet 103 can be tightly matched with the inner wall of the heat exchange tube 6 to prevent it from escaping upward due to excessive vibration. The upper end of the cleaning spindle 3 passes through the vertical shaft hole of the central long shaft sleeve 101 upward from the lower end of the central long shaft sleeve 101. The shaft cap 2 is provided with a radial through-connecting hole 201. The upper end of the cleaning spindle 3 is correspondingly provided with a through hole. The shaft cap 2 and the cleaning spindle 3 can be connected by passing through the through-connecting hole 201 and the through hole through a steel wire or a pin. Two friction pads 4 are sleeved between the upper end of the cyclone frame 1 and the upper end of the inner part of the sleeve on the cleaning spindle 3. By setting the friction pads 4, the vibration friction loss between the upper end of the cleaning spindle 3 and the upper end of the inner part of the sleeve can be reduced. When maintenance is required, only the friction pads 4 need to be replaced. A gap is provided between the inner wall of the vertical shaft hole and the cleaning spindle 3. The gap is convenient for installation and also convenient for the axial movement and circumferential rotation of the cleaning spindle 3. The lower end of the cleaning spindle 3 is provided with a connection interface for connecting with the cleaning spiral 5.

[0022] In order to reduce the manufacturing cost, the spiral rotation angle A of the guide spiral blade 103 is ≤ 360 / N, where N is the number of the support blades 102. In this example, the spiral rotation angle A of the guide spiral blade 103 is 90 degrees. This relative number ensures that there is no obstruction on the periphery of the cyclone frame 1 from the axial perspective. When the product demand is large and needs to be manufactured by molding, it is easier to open the mold, which can reduce the mold opening manufacturing cost.

[0023] In order to facilitate the installation of the shaft cap 2, the inner wall diameter of the shaft cap 2 is larger than the outer diameter of the friction pad 4 and the central long shaft sleeve 101, and the gap between the two is larger than the gap between the inner wall of the vertical shaft hole and the cleaning spindle 3. It is convenient to install the shaft cap 2, and the shaft cap 2 will not interfere with the outer wall of the central long shaft sleeve 101 during installation.

[0024] In order to reduce the vibration resistance, the lower part of the central shaft hole is provided with a coaxial expansion hole 104 having a diameter larger than the central shaft hole. The coaxial expansion hole 104 increases the gap, facilitates the installation of the cleaning spindle 3, and reduces the vibration resistance of the axial movement and circumferential rotation of the cleaning spindle 3 when it is tilted due to vibration.

[0025] In order to achieve the axial movement limit of the cleaning spindle 3, the lower end of the cleaning spindle 3 is provided with a connector 301 with a diameter larger than the reaming hole 104, and the connector 301 is provided with a hook head perforation 302 as a connection interface connected to the end hook head of the cleaning spiral 5, and the connection interface adopts an interface hole matching the shape of the end hook head of the cleaning spiral 5. The diameter of the connector 301 is larger than the reaming hole 104 to facilitate the axial movement limit, and the radial interface perforation facilitates the connection of the end steel wire of the cleaning spiral 5.

[0026] During installation, the device is set at the upper end of the evaporator heat exchange tube 6, the upper end outer side of the support sheet 102 is stuck on the end surface of the evaporator heat exchange tube 6 as a support and limit component, the main part of the support sheet 102 and the guide spiral sheet 103 are inserted into the heat exchange tube 6, the cleaning spiral 5 is installed in the evaporator heat exchange tube 6, and the end hook of the cleaning spiral 5 is connected with the hook hole 302 at the lower end of the cleaning main shaft 3. The frequency conversion cabinet is installed to enable the pump to operate at a specific frequency. After starting the motor, the axial fluid passes through the space between the support sheets 102 and hits the guide spiral sheet 103. The direction of the fluid changes from axial to radial and circumferential, and continues to move along the axial direction, driving the rotation and vibration of the cleaning spiral 5. The guide spiral sheet 103 can increase the disturbance of the liquid in the tube, so that the fluid passes through the heat exchange tube 6 more evenly, thereby improving the cleaning effect and heat exchange efficiency.

[0027] The device uses the flow energy and secondary steam energy of the water in the evaporator tube as the automatic cleaning power, uses its own flow velocity to pass through the space between the support plates 102, and then changes the flow direction through the guide spiral plate 103 to drive the cleaning spiral 5, so as to realize the long-term and continuous rapid circumferential rotation and axial vibration of the cleaning spiral 5 in the heat exchange tube 6. On the one hand, the tube wall is cleaned, and on the other hand, the laminar flow of water in the tube is changed to a turbulent state, which destroys the formation mechanism of scale, changes passive scale removal to active scale removal, prevents scaling, and can realize cleaning without stopping the equipment, thus avoiding the loss caused by stopping the equipment for cleaning, strengthening the heat exchange capacity, and greatly improving the heat transfer coefficient of the heat exchange equipment, which is beneficial to increasing production and saving energy.

[0028] above Figure 1-3 The heat exchanger automatic cleaning power device shown is a specific embodiment of the utility model, which has embodied the substantial characteristics and progress of the utility model. According to actual use needs and under the inspiration of the utility model, equivalent modifications can be made to its shape, structure, etc., which are all within the protection scope of this scheme.

Claims

1. A heat exchanger automatic cleaning power device, characterized in that: The invention comprises a cyclone frame (1), a shaft cap (2) and a cleaning spindle (3). The cyclone frame (1) comprises a central long shaft sleeve (101), a support sheet (102) and a guide spiral sheet (103). The support sheet (102) is evenly distributed around the lower periphery of the central long shaft sleeve (101). The lower end of each support sheet (102) is provided with a guide spiral sheet (103). The inner sides of the guide spiral sheet (103) and the support sheet (102) are integrated with the outer periphery of the central long shaft sleeve (101). The upper end of the cleaning spindle (3) passes through the vertical shaft hole of the central long shaft sleeve (101) from the lower end of the central long shaft sleeve (101). The shaft cap (2) is connected to the upper end of the central long shaft sleeve (101). The cleaning spindle (3) can move axially and rotate circumferentially. The lower end of the cleaning spindle (3) is provided with a connection interface for connecting with a cleaning spiral (5).

2. The heat exchanger automatic cleaning power device according to claim 1, characterized in that: The spiral rotation angle A of the guide spiral blade (103) is ≤360 / N, where N is the number of support blades (102).

3. The heat exchanger automatic cleaning power device according to claim 2, characterized in that: The number of N is 3-6.

4. The heat exchanger automatic cleaning power device according to claim 3, characterized in that: The distance between the outer side of the upper end of the support sheet (102) and the center of the vertical axial hole is 3-10 mm greater than the radius of the inner wall of the heat exchange tube.

5. The heat exchanger automatic cleaning power device according to claim 4, characterized in that: A plurality of friction pads (4) are provided on the cleaning main shaft (3) between the upper end of the cyclone frame (1) and the upper end of the inner part of the shaft sleeve.

6. The heat exchanger automatic cleaning power device according to claim 5, characterized in that: A gap is provided between the inner wall of the vertical shaft hole and the cleaning main shaft (3).

7. The heat exchanger automatic cleaning power device according to claim 6, characterized in that: The inner wall diameter of the shaft cap (2) is larger than the outer diameters of the friction pad (4) and the central long shaft sleeve (101), and the gap between the two is larger than the gap between the inner wall of the vertical shaft hole and the cleaning main shaft (3).

8. The heat exchanger automatic cleaning power device according to claim 7, characterized in that: The shaft cap (2) is provided with a radial through-connecting hole (201), and the upper end of the cleaning spindle (3) is correspondingly provided with a through-hole, and a steel wire or a pin can be passed through the through-connecting hole (201) and the through-hole to connect the shaft cap (2) and the cleaning spindle (3).

9. The heat exchanger automatic cleaning power device according to claim 8, characterized in that: A coaxial expansion hole (104) having a diameter greater than that of the central axis hole is provided at the lower portion of the central axis hole.

10. The heat exchanger automatic cleaning power device according to claim 9, characterized in that: The lower end of the cleaning spindle (3) is provided with a connector (301) having a diameter greater than the reaming hole (104), and the connector (301) is provided with a hook hole (302) as the connection interface for connecting with the end hook of the cleaning spiral (5).

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