An on-line cleaning device for a shell-and-tube heat exchanger

Abstract

The present invention discloses an on-line cleaning device for a shell-and-tube heat exchanger, which is characterized in that: it includes a housing, a rotating shaft arranged at the center of the housing, and silica gel balls. The rotating shaft is provided with spiral blades for controlling the water flow direction, and there are gaps between the blades of the spiral blades for the silica gel balls to pass through. The rotating shaft extends out of the top of the housing and is connected to a motor, and a check valve is also arranged at the bottom of the rotating shaft; the top of the housing is connected to the water inlet pipe of the heat exchanger, and the cavity between the bottom of the housing and the check valve is connected to the water outlet pipe of the heat exchanger. By adopting the structure of the spiral blades and the check valve, the opening and closing of the check valve are realized by adjusting the water pressure through the spiral blades, so as to realize the ball collection and ball sending functions of the silica gel balls; the spiral blades can pass silica gel balls with a diameter smaller than the blade gap, and spiral blades with different blade gaps can be replaced, so that the device has no limitation on the size of the silica gel balls and does not require the use of special silica gel balls, improving the applicability of the device.

Description

Technical Field

[0001] The present invention relates to the technical field of heat exchanger cleaning, and particularly to an on-line cleaning device for a shell-and-tube heat exchanger. Background Art

[0002] The heat exchanger cleaning system is an advanced pure physical water treatment device. Because it is very environmentally friendly and energy-saving, and greatly improves the performance of the heat exchanger, it has been applied to ordinary heat exchange equipment (such as air conditioners, petrochemicals, etc.) abroad very early. In recent years, it has also been fully recognized in China and continuously promoted. The heat exchanger cleaning system is precisely controlled by a controller, allowing special rubber balls to enter each condenser tube along with the water flow. Through the continuous friction of the rubber balls against the tube wall, the dirt and algae in the pipeline are thoroughly cleaned, keeping the condenser tube clean for a long time, improving the heat exchange rate of the heat exchanger and the air conditioner COP, and saving the environment.

[0003] The existing Chinese Patent No. 101691980A discloses an on-line cleaning device. It mainly has the following two problems: 1. Special silica gel balls dedicated to this cleaning device must be equipped, and ordinary silica gel balls are not applicable; 2. The ball receiving and sending structure is complex. Summary of the Invention

[0004] The present invention provides an on-line cleaning device for a shell-and-tube heat exchanger with a simple structure and applicable to a variety of silica gel balls in view of the above-mentioned deficiencies of the prior art.

[0005] The technical solution adopted by the present invention is: an on-line cleaning device for a shell-and-tube heat exchanger, characterized in that: it includes a housing, a rotating shaft provided at the center of the housing, and silica gel balls. The rotating shaft is provided with spiral blades for controlling the water flow direction, and there are gaps for passing the silica gel balls between the blades of the spiral blades. The rotating shaft extends out of the top of the housing and is connected to a motor, and a check valve is also provided at the bottom of the rotating shaft; the top of the housing is connected to the outlet pipe of the heat exchanger, and the cavity between the bottom of the housing and the check valve is connected to the inlet pipe of the heat exchanger.

[0006] According to the above technical solution, the check valve separates the housing. When the water pressure in the upper part of the housing reaches a predetermined value, the check valve connects the upper and lower parts under the action of the pressure.

[0007] According to the above technical solution, the check valve adopts a single-flap check valve, including a rocker and a valve flap connected to the rocker. The valve flap can rotate a certain angle around the pin shaft of the rocker under the action of water pressure.

[0008] According to the above technical solution, the range of the rotation angle of the valve flap around the pin shaft of the rocker is 60° to 120°, and the diameter of the silica gel ball is less than 40 mm.

[0009] According to the above technical solution, a first water inlet and a first water outlet are provided at the top of the housing, and a second water inlet and a second water outlet are provided between the bottom of the housing and the check valve; the first water inlet and the first water outlet are connected to the water outlet pipe of the heat exchanger, and the second water inlet and the second water outlet are connected to the water inlet pipe of the heat exchanger.

[0010] According to the above technical solution, a filter screen for blocking silica gel balls is provided between the first water outlet and the second water inlet.

[0011] According to the above technical solution, the inner cavity of the housing is cylindrical, and the spiral blade is attached to the inner wall of the housing, dividing the inner cavity between the inner wall of the housing and the rotating shaft into a spiral channel from top to bottom.

[0012] According to the above technical solution, the screwing direction of the spiral blade is the same as the rotation direction of the motor.

[0013] According to the above technical solution, the motor is set to rotate clockwise, and the spiral blade adopts a right-handed structure with a clockwise screwing direction.

[0014] According to the above technical solution, the motor is a speed-adjustable motor, and is provided with a high-speed mode and a low-speed mode.

[0015] The beneficial effects achieved by the present invention are as follows:

[0016] 1. By adopting the structure of the spiral blade and the check valve, the opening and closing of the check valve are realized by adjusting the water pressure through the spiral blade, so as to realize the functions of collecting and serving silica gel balls; the spiral blade can pass silica gel balls with a diameter smaller than the blade gap, and spiral blades with different blade gaps can be replaced, making the device have no limitation on the size of silica gel balls and eliminating the need to use special silica gel balls, thus improving the applicability of the device.

[0017] 2. By adjusting the water pressure through the speed-adjustable motor and the spiral blade, the check valve is opened at high water pressure and closed at low water pressure, simplifying the structure of ball collection and serving, and thus simplifying the structure of the cleaning device. Description of the Drawings

[0018] Figure 1 It is a schematic diagram of the connection between the embodiment provided by the present invention and the heat exchanger;

[0019] Figure 2 It is an external schematic diagram of the connection between the embodiment provided by the present invention and the heat exchanger;

[0020] Figure 3 It is an external structure schematic diagram of the embodiment provided by the present invention;

[0021] Figure 4 It is provided by the present invention Figure 3 Cross-sectional view along B-B in the embodiment

[0022] Figure 5 Schematic structural diagram of the check valve according to the embodiment provided by the present invention;

[0023] In the figure, 1 - housing; 2 - rotating shaft; 3 - silica gel ball; 4 - motor; 5 - spiral blade; 6 - check valve, 6-1 valve flap, 6-2 - rocker; 7 - heat exchanger; 8 - water inlet pipe; 9 - water outlet pipe; 10 - first water inlet; 11 - first water outlet; 12 - second water inlet; 13 - second water outlet; 14 - filter screen. Specific embodiments

[0024] The present invention will be further described below with reference to the accompanying drawings.

[0025] As Figures 1-5 shown, this embodiment provides an on-line cleaning device for a shell-and-tube heat exchanger, including a housing 1, a rotating shaft 2 provided at the center of the housing 1, and a silica gel ball 3. The housing 1 adopts a cylindrical structure, and its inner cavity is also cylindrical. The rotating shaft 2 is installed at the axis of the housing 1, and the rotating shaft 2 extends out of the top end of the housing 1 and is connected to the motor 4, and the rotation of the rotating shaft 2 is driven by the motor 4. The rotating shaft 2 is provided with spiral blades 5 for controlling the water flow direction; the spiral blades 5 can pass through the silica gel ball 3 with a diameter smaller than the blade gap, and spiral blades with different blade gaps can be replaced, so the size of the silica gel ball 3 is not limited in this embodiment. A check valve 6 is also provided at the bottom of the rotating shaft 2. The check valve 6 fits against the inner wall of the housing 1, dividing the inner cavity of the housing 1 into two non-connected upper and lower parts. The bottom of the housing 1 is connected to the water inlet pipe 8 of the heat exchanger 7, and the top of the housing 1 is connected to the water outlet pipe 9 of the heat exchanger 7.

[0026] The screwing direction of the spiral blade 5 is the same as the screwing direction of the motor 4, and the spiral blade 5 fits against the cylindrical inner wall of the housing 1, dividing the inner cavity between the inner wall of the housing 1 and the rotating shaft 2 into a spiral channel from top to bottom. When the motor is started, the rotating shaft 2 drives the spiral blade 5 to rotate. Since the screwing direction of the spiral blade 5 is the same as the screwing direction of the motor 4, according to the principle of the Archimedes screw pump, the water flow will flow downward along the spiral channel formed by the spiral blade 5 and the housing 1 under the drive of the spiral blade 5. In this embodiment, the motor 4 is set to rotate clockwise, and the spiral blade 5 adopts a right-handed structure with a clockwise screwing direction; when the motor 4 drives the spiral blade 5 to rotate, the water flow flows downward along the spiral blade 5, increasing the pressure at the bottom end of the spiral blade 5 (i.e., the upper surface of the check valve 6). The motor 4 is a speed-adjustable motor, with a high-speed mode and a low-speed mode; when the motor 4 is in the high-speed mode, a high pressure A is generated at the bottom end of the spiral blade 5; when the motor 4 is in the low-speed mode, a low pressure B is generated at the bottom end of the spiral blade 5. The check valve 6 is set with a predetermined pressure value C, and A > C > B; when the pressure value on the upper surface of the check valve 6 is greater than the predetermined pressure value C, the check valve 6 opens, enabling the upper and lower parts of the housing 1 to communicate.

[0027] The check valve 6 in this embodiment is a single-flap check valve, comprising a rocker 6-2 and a valve disc 6-1 connected to the rocker 6-2. When the water pressure above the check valve reaches a predetermined pressure value C, the valve disc 6-1 rotates a certain angle about the pin of the rocker 6-2, thereby connecting the upper and lower parts of the housing 1. To ensure that the silicone ball 3 enters the heat exchanger 7 from the angle at which the valve disc 6-1 rotates open, the rotation angle of the valve disc 6-1 is between 60° and 120°, preferably 75°, and the diameter of the silicone ball must be less than 40 mm.

[0028] The top of the housing 1 is provided with a first water inlet 10 and a first water outlet 11 (the first water inlet and outlet are located above the check valve), and a second water inlet 12 and a second water outlet 13 are provided between the bottom of the housing and the check valve (the second water inlet and outlet are located below the check valve). The first water inlet 10 and the first water outlet 11 are connected to the outlet pipe 9 of the heat exchanger 7 for recovering the silicone balls 3 flowing back from the heat exchanger; the second water inlet 12 and the second water outlet 13 are connected to the inlet pipe 8 of the heat exchanger 7 for delivering the silicone balls 3 into the heat exchanger 7 along the inlet pipe 8. A filter 14 is provided between the first water outlet 11 and the second water inlet 12 to prevent the silicone balls 3 from flowing out of the cleaning device and the heat exchanger through the inlet pipe 8 or the outlet pipe 9.

[0029] The device works as follows:

[0030] Step 1: Adjust the motor 4 to low speed mode. The motor 4 drives the spiral blade 5 to rotate, so that the silicone balls 3 sink with the help of the downward thrust of the water flow. However, the thrust generated by the water flow is not enough to push open the check valve 6, so that all the silicone balls 3 gather at the lower part of the shell 1 (the upper surface of the check valve 6). This means that the ball collection is completed.

[0031] Step 2: Adjust the motor 4 to high-speed mode to increase the thrust generated by the water flow. At this time, the larger thrust will push the valve disc of the check valve 6 downward, so that all the silicone balls 3 sink from the opening of the valve disc of the check valve 6 to the bottom of the shell 1; then the silicone balls 3 enter the pipe of the heat exchanger 7 along the direction of water flow and start to clean the dirt in the pipe.

[0032] The above steps 1 and 2 constitute a complete cycle of receiving and serving the ball. You can repeat steps 1 and 2 as many times as needed to complete multiple cleaning of the heat exchanger. For units with large water flow, multiple cleaning devices can be installed to complete the cleaning function according to the principle of diversion.

[0033] The above examples are merely examples of the design concepts and features of the present invention. Their purpose is to enable those skilled in the art to understand the contents of the present invention and implement them accordingly. The scope of protection of the present invention is not limited to the above examples. Therefore, any equivalent changes or modifications made based on the principles and design concepts disclosed in the present invention are within the scope of protection of the present invention.

Claims

1. An on-line cleaning device for a shell-and-tube heat exchanger, characterized in that: It includes a housing, a rotating shaft disposed at the center of the housing, and a silica gel ball. A spiral blade for controlling the water flow direction is provided on the rotating shaft, and there is a gap between the blades of the spiral blade for the silica gel ball to pass through. The rotating shaft extends out of the top of the housing and is connected to a motor. A check valve is also provided at the bottom of the rotating shaft. The top of the housing is connected to the water outlet pipe of the heat exchanger, and the cavity between the bottom of the housing and the check valve is connected to the water inlet pipe of the heat exchanger. The check valve separates the housing. When the water pressure in the upper part of the housing reaches a predetermined value, the check valve connects the upper and lower parts under the action of the pressure. A first water inlet and a first water outlet are provided at the top of the housing, and a second water inlet and a second water outlet are provided between the bottom of the housing and the check valve. The first water inlet and the first water outlet are connected to the water outlet pipe of the heat exchanger, and the second water inlet and the second water outlet are connected to the water inlet pipe of the heat exchanger. A filter screen for blocking the silica gel ball is provided at the first water outlet and the second water inlet. The motor is a speed-regulating motor.

2. The on-line cleaning device for the shell-and-tube heat exchanger according to claim 1, characterized in that: The check valve adopts a single-flap check valve, which includes a rocker and a valve flap connected to the rocker. The valve flap can rotate a certain angle around the pin shaft of the rocker under the action of water pressure.

3. The on-line cleaning device for the shell-and-tube heat exchanger according to claim 2, wherein: The range of the rotation angle of the valve flap around the pin shaft of the rocker is 60° to 120°, and the diameter of the silica gel ball is less than 40 mm.

4. The on-line cleaning device for the shell-and-tube heat exchanger according to claim 1, wherein: The inner cavity of the housing is cylindrical. The spiral blade fits with the inner wall of the housing, and the inner cavity between the inner wall of the housing and the rotating shaft is divided into a spiral channel from top to bottom.

5. The on-line cleaning device for the shell-and-tube heat exchanger according to claim 1, characterized in that: The screwing-in direction of the spiral blade is consistent with the rotation direction of the motor.

6. The on-line cleaning device for the shell-and-tube heat exchanger according to claim 5, characterized in that: The motor is set to rotate clockwise, and the spiral blade adopts a right-handed structure with clockwise screwing-in.

7. The on-line cleaning device for the shell-and-tube heat exchanger according to claim 1, characterized in that: The motor is provided with a high-speed mode and a low-speed mode.

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