Secondary filter screen filtering device and condenser circulating cooling water system

Abstract

The utility model relates to a secondary filter screen filtering device and a condenser circulating cooling water system.The filtering device comprises a pipe body and a filter screen located in the pipe body and further comprises a sewage discharging assembly and a power assembly, the sewage discharging assembly comprises a sewage suction box and a sewage discharging pipe, and the sewage suction box is fixedly connected to the sewage discharging pipe and comprises a sewage suction opening; the sewage suction port is used for sucking impurities on the filter screen, the sewage discharge pipe is communicated with the sewage suction box, a sewage discharge port is formed in the sewage discharge pipe, and the sewage discharge port is communicated with a negative pressure source; the power assembly is in transmission connection with the pollution discharge assembly and used for driving the pollution discharge assembly to rotate relative to the filter screen. The secondary filter screen filtering device disclosed by the utility model is communicated with the external negative pressure source through the blow-off pipe, so that the negative pressure of the sewage suction pipe for sucking impurities on the filter screen becomes controllable, the impurity removal effect can be improved, higher impurity removal efficiency is achieved, and the situation that the impurities on the filter screen are not cleaned up and accumulated for a long time due to insufficient negative pressure is avoided; and finally, the safe operation of the unit is greatly influenced.

Description

Technical Field

[0001] The present disclosure relates to the technical field of filtering equipment, and in particular to a secondary filter screen filtering device and a condenser circulating cooling water system using the secondary filter screen filtering device. Background Art

[0002] The secondary filter device is the secondary purification equipment of the condenser circulating cooling water system and one of the main equipment in the rubber ball cleaning system. The function of the secondary filter device is to filter the debris in the cooling water inlet pipeline to prevent the condenser heat exchange tube from being blocked by debris and ensure that the condenser water chamber is in a clean state.

[0003] In the related art, the suction box of the secondary filter screen filtering device is mostly made into an integral closed suction box, which uses the negative pressure backwashing formed by the closed suction box to absorb the dirt on the filter screen. The size of the negative pressure of the suction box and the pressure of the condenser circulating water inlet pipeline determine the suction effect. However, the negative pressure formed by the suction box and the pressure in the condenser circulating water inlet pipeline are not adjustable, and it is difficult to ensure that the sludge, scale and debris stuck on the filter screen are washed away. When the equipment has been running for a long time, some of the mesh holes on the filter screen will be blocked by debris or the mesh holes will become smaller due to a large amount of scale, and the flow area of ​​the filter screen will become smaller, resulting in an increase in the resistance of the system, which has a greater impact on the safe operation of the unit. Utility Model Content

[0004] The purpose of the present disclosure is to provide a secondary filter screen filtering device, which can effectively clean impurities located on the filter screen.

[0005] In order to achieve the above-mentioned object, the present disclosure provides a secondary filter screen filtering device, comprising a tube body and a filter screen located in the tube body, and further comprising:

[0006] A sewage discharge component, the sewage discharge component includes a sewage suction box and a sewage discharge pipe, the sewage suction box is fixedly connected to the sewage discharge pipe and includes a sewage suction port, the sewage suction port is used to suck impurities on the filter screen, the sewage discharge pipe is connected to the sewage suction box, and the sewage discharge pipe is provided with a sewage discharge port, and the sewage discharge port is connected to a negative pressure source; and a power component, the power component is transmission-connected to the sewage discharge component and is used to drive the sewage discharge component to rotate relative to the filter screen.

[0007] Optionally, the dirt suction box is strip-shaped and is connected to the sewage discharge pipe via a connecting pipe, one end of the connecting pipe is fixedly connected to the dirt suction box, and the other end is fixedly connected to the sewage discharge pipe.

[0008] Optionally, the filter screen is conical, the dirt suction box is arranged at an angle, and a plurality of connecting pipes are provided, which are arranged at intervals along the extension direction of the dirt suction box.

[0009] Optionally, the sewage pipe includes a first sewage pipe and a second sewage pipe, the first sewage pipe extends in a vertical direction and is transmission-connected to the power assembly and can rotate relative to the filter, the second sewage pipe is fixedly connected to the pipe body, one end of the second sewage pipe is connected to the first sewage pipe, and the other end forms the sewage outlet connected to the negative pressure source.

[0010] Optionally, the first sewage pipe is rotatably connected to the tube body via a bearing, the first sewage pipe is fixedly connected to the outer ring of the bearing, and the second sewage pipe is fixedly connected to the inner ring of the bearing.

[0011] Optionally, the drain pipe includes a third drain pipe, one end of which is connected to the bottom of the filter screen, and the other end of which is connected to the negative pressure source, and the third drain pipe is used to discharge impurities at the bottom of the filter screen.

[0012] Optionally, a sedimentation tank is provided at the bottom of the filter screen, an open end of the sedimentation tank is connected to the bottom of the filter screen, and the third sewage pipe is connected to the sedimentation tank.

[0013] Optionally, bristles are provided at the sewage suction port, and ends of the bristles abut against the filter screen to scrape off impurities on the filter screen.

[0014] Optionally, the power assembly includes a motor, a transmission chain and a sprocket, the sprocket is fixedly connected to the sewage pipe, and the motor is used to drive the sewage pipe to rotate through the transmission chain and the sprocket.

[0015] According to a second aspect of the present disclosure, a condenser circulating cooling water system is also provided, comprising the secondary filter screen filtering device described in the above embodiment.

[0016] Compared with the prior art, the advantages of the utility model are as follows: the secondary filter screen filtering device of the utility model includes a tube body and a filter screen, as well as a sewage discharge component and a power component arranged in the tube body, the sewage discharge component includes a sewage discharge pipe and a sewage suction box, the sewage suction box is fixedly connected to the sewage discharge pipe and has a sewage suction port, the sewage discharge component is connected to an external negative pressure source, and can provide negative pressure for the sewage suction box, and the power component can drive the sewage discharge pipe and the sewage suction box to rotate relative to the tube body. The secondary filter screen filtering device disclosed in the present invention is connected to an external negative pressure source through a sewage discharge pipe, so that the negative pressure of the sewage suction pipe to absorb impurities from the filter screen becomes controllable, thereby being able to improve the effect of impurity removal, having a higher impurity removal efficiency, and avoiding the impurities on the filter screen not being cleaned up and accumulated for a long time due to insufficient negative pressure, which ultimately has a greater impact on the safe operation of the unit.

[0017] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0019] Figure 1 is a cross-sectional view of a secondary screen filtering device provided in an exemplary embodiment of the present disclosure;

[0020] Figure 2 is a cross-sectional view of a dirt suction box in a secondary filter screen filtering device provided in an exemplary embodiment of the present disclosure.

[0021] Description of Reference Numerals

[0022] 1- sewage discharge assembly; 11- sewage suction box; 111- sewage suction port; 12- sewage discharge pipe; 121- sewage discharge port; 122-first sewage discharge pipe; 123-second sewage discharge pipe; 124-third sewage discharge pipe; 13-connecting pipe; 14-precipitation tank; 15-brush;

[0023] 2-power assembly; 21-motor; 22-transmission chain; 23-sprocket;

[0024] 3-tube body; 4-filter; 5-bearing. DETAILED DESCRIPTION

[0025] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0026] In the present disclosure, unless otherwise stated, directional words such as "upper, lower, high, low, top, bottom" generally refer to the position of the corresponding component or structure in the direction of gravity. Figure 1 The directions of the drawings shown. "Inside and outside" refer to the inside and outside of the corresponding component outline. In addition, it should be noted that the terms used, such as "first, second", etc., are to distinguish one element from another and have no order or importance. In addition, in the description with reference to the drawings, the same mark in different drawings represents the same element. The above definitions are only used to explain and illustrate the present disclosure and should not be understood as limitations on the present disclosure.

[0027] For ease of understanding, please refer to the attached Figure 1 to Figure 2 , the specific structure and working principle of the secondary filter screen filtering device disclosed in the present invention are explained in detail in combination with the embodiments.

[0028] The present disclosure relates to a secondary filter device, which has a good filtering effect and can prevent impurities from being accumulated on the filter 4 for a long time, causing the mesh of the filter 4 to become smaller, and the flow area of ​​the filter 4 to become smaller, which ultimately has a great impact on the safe operation of the unit. Figure 1 The secondary filter screen filtering device disclosed in the present invention includes a tube body 3 and a filter screen 4, as well as a sewage discharge component 1 and a power component 2 arranged in the tube body 3. Among them, the sewage discharge component 1 includes a sewage suction box 11 and a sewage discharge pipe 12, the sewage suction box 11 is fixedly connected to the sewage discharge pipe 12 and communicated with the sewage discharge pipe 12, and a sewage suction port 111 is arranged on the sewage suction box 11, and impurities located on the filter screen 4 can be sucked through the sewage suction port 111. A sewage discharge port 121 is arranged on the sewage discharge pipe 12, and the sewage discharge port 121 is communicated with an external negative pressure source, and the negative pressure source can be a water pump or other components with negative pressure. The power component 2 is transmission-connected to the sewage discharge component 1, and the sewage discharge component 1 can be driven to rotate relative to the tube body 3 through the power component 2.

[0029] In this embodiment, the power assembly 2 can be rotatably connected to the sewage pipe 12, and the sewage pipe 12 is driven to rotate, and then the sewage suction box 11 located on the sewage pipe 12 is driven to rotate through the sewage pipe 12, so that the sewage suction box 11 can absorb impurities on the circumference of the filter screen 4. When absorbing impurities on the filter screen 4, since the sewage suction box 11 is connected to the sewage pipe 12, and the sewage discharge port 121 on the sewage pipe 12 is connected to the external negative pressure source, the external negative pressure source can transmit the negative pressure to the sewage suction box 11 through the sewage pipe 12, and finally absorb the impurities on the filter screen 4 through the sewage suction port 111 on the sewage suction box 11, so as to avoid the accumulation of impurities on the filter screen 4, and since the negative pressure is provided to the sewage suction port 111 by the external negative pressure source, the negative pressure at the sewage suction port 111 is controllable, thereby avoiding the problem of incomplete cleaning of impurities on the filter screen 4 due to too low negative pressure.

[0030] The secondary filter screen filtering device disclosed in the present invention is provided with a sewage discharge component 1 that can rotate relative to the pipe body 3. The sewage discharge pipe 12 in the sewage discharge component 1 is connected to the external negative pressure source, and the sewage discharge component 1 can also be driven to rotate by the power component 2, so as to ensure that the sewage discharge component 1 can fully clean the circumference of the filter screen 4 when cleaning the filter screen 4. When cleaning the filter screen 4, since the external negative pressure source provides negative pressure to the suction box 11 connected to the sewage discharge pipe 12, the negative pressure of the cleaning becomes controllable, thereby improving the cleaning effect, avoiding the impurities on the filter screen 4 not being cleaned up and accumulated for a long time due to insufficient negative pressure, which ultimately has a great impact on the safe operation of the unit.

[0031] In one embodiment of the present disclosure, see Figure 1 and Figure 2The dirt suction box 11 is in a strip shape and is connected to the sewage discharge pipe 12 through a connecting pipe 13. The dirt suction box 11 is configured in a strip shape, so that the volume of the dirt suction box 11 can be reduced, so that when the dirt suction box 11 rotates relative to the tube body 3, there can be less resistance between the dirt suction box 11 and the fluid in the tube body 3, which facilitates the dirt suction box 11 to rotate smoothly in the tube body 3, improves the efficiency of the dirt suction box 11 in absorbing impurities in the filter screen 4, and the smaller resistance can also reduce the power of the power component 2 to drive the dirt suction box 11 to rotate relative to the tube body 3, saving energy to a certain extent and improving applicability.

[0032] In addition, the dirt suction box 11 is connected to the sewage discharge pipe 12 through the connecting pipe 13, and the volume of the connecting pipe 13 is also small, which can further reduce the resistance of the dirt suction box 11 when it moves in the fluid. When connecting, one end of the connecting pipe 13 is connected to the dirt suction box 11, and the other end is connected to the sewage discharge pipe 12. The connected parts can be fixed by welding to ensure the stability of the dirt suction box 11 during the rotation process and prevent the dirt suction box 11 from falling off the sewage discharge pipe 12. Of course, in other embodiments, the dirt suction box 11 can also be of other shapes and connected to the sewage discharge pipe 12 through other components. The specific shape can be determined according to the actual situation, and the present disclosure does not limit this.

[0033] In one embodiment of the present disclosure, see Figure 1 and Figure 2 , the filter screen 4 is conical, which can play a better filtering role. In order to fit the filter screen 4 to absorb impurities, the suction box 11 is also tilted. In this embodiment, the suction port 111 on the suction box 11 is strip-shaped and located at the edge of the suction box 11 close to the filter screen 4. It can be spaced a certain distance from the surface of the filter screen 4, so that the suction port 111 can absorb impurities on the filter screen 4. Since the suction box 11 is tilted, in order to improve the stability of the connection between the suction box 11 and the sewage pipe 12, the suction box 11 is connected to the sewage pipe 12 through multiple connecting pipes 13, and the multiple connecting pipes 13 are spaced along the extension direction of the suction box. Multiple connecting pipes 13 can all be connected to the suction box 11 and the sewage pipe 12, so that the negative pressure in the suction port 111 can be more uniform, or only one connecting pipe 13 can be used to connect the suction box 11 and the sewage pipe 12, and the other connecting pipes 13 only play a connecting role to improve the stability of the connection between the suction box 11 and the sewage pipe 12.

[0034] In one embodiment of the present disclosure, see Figure 1 and Figure 2The sewage pipe 12 includes a first sewage pipe 122 and a second sewage pipe 123. The first sewage pipe 122 extends in the vertical direction and is in transmission connection with the power assembly 2, so that the first sewage pipe 122 can rotate relative to the filter screen 4. The first sewage pipe 122 is arranged in the vertical direction, which can better transmit the negative pressure and impurities on the filter screen 4. The second sewage pipe 123 is fixedly connected to the pipe body 3, and one end of the second sewage pipe 123 is connected to the first sewage pipe 122, and the other end forms a sewage outlet 121 extending outside the pipe body 3 and connected to the negative pressure source, so that the negative pressure generated by the negative pressure source can be transmitted to the first sewage pipe 122 and the sewage suction box 11 through the second sewage pipe 123.

[0035] Since the second sewage pipe 123 is connected to the external negative pressure source and cannot rotate, the second sewage pipe 123 is fixedly connected to the pipe body 3. In order to ensure the communication between the first sewage pipe 122 and the second sewage pipe 123, a connecting piece can be provided between the first sewage pipe 122 and the second sewage pipe 123 to ensure that the first sewage pipe 122 can still rotate normally when the second sewage pipe 123 is fixed. Of course, in other embodiments, the structure of the sewage pipe 12 can also be of other types, which can be determined according to actual conditions, and the present disclosure does not limit this.

[0036] In one embodiment of the present disclosure, see Figure 1 and Figure 2 , the first sewage pipe 122 and the second sewage pipe 123 are rotatably connected together through the bearing 5. The first sewage pipe 122 is fixedly connected to the outer ring of the bearing 5, and the second sewage pipe 123 is fixedly connected to the inner ring of the bearing 5, and the bearing 5 can be connected to the pipe body 3 through the bearing seat. When the first sewage pipe 122 rotates under the action of the power component 2, it will rotate relative to the inner ring of the bearing 5 without affecting the second sewage pipe 123 connected to the inner ring. Moreover, the connection through the bearing 5 can also ensure that the first sewage pipe 122 and the second sewage pipe 123 can be normally connected, and the fluid and impurities in the first sewage pipe 122 will not be unable to flow into the second sewage pipe 123 for discharge. Of course, in other embodiments, the first sewage pipe 122 and the second sewage pipe 123 can also be connected by other components, which can be determined according to actual conditions, and the present disclosure does not limit this.

[0037] The impurities on the filter screen 4 may sometimes flow to the bottom of the filter screen 4 and accumulate under the impact of the fluid, and the dirt suction box 11 cannot inevitably adsorb the part located at the bottom of the filter screen 4. In order to more comprehensively clean the impurities on the filter screen 4, in one embodiment of the present disclosure, see Figure 1 and Figure 2The sewage pipe 12 further includes a third sewage pipe 124, one end of which is connected to the bottom of the filter screen 4, and the other end of which can extend out of the pipe body 3 and be connected to an external negative pressure source. After the filter screen 4 has been used for a period of time, a certain amount of impurities will be deposited at the bottom of the filter screen 4. At this time, the negative pressure source connected to the third sewage pipe 124 can be opened, and the impurities at the bottom of the filter screen 4 can be sucked through the end of the third sewage pipe 124 connected to the bottom of the filter screen 4, so that the impurities can be discharged through the third sewage pipe 124.

[0038] In one embodiment of the present disclosure, see Figure 1 and Figure 2 A sedimentation tank 14 is provided at the bottom of the filter screen 4. The sedimentation tank 14 may be cylindrical and have an opening at one end. The opening of the sedimentation tank 14 may be connected to the filter screen 4. The third sewage pipe 124 is connected to the sedimentation tank 14. The connecting position may be the side wall of the sedimentation tank 14, so that the third sewage pipe 124 can be easily set. Since the sedimentation tank 14 has a large volume, the sedimentation tank 14 can be provided so that the impurities at the bottom of the filter screen 4 can be deposited in the sedimentation tank 14 for easy discharge. On the other hand, since the sedimentation tank 14 has a large volume, the number of times the impurities at the bottom of the filter screen are cleaned can be reduced. After the sedimentation accumulates to a certain amount, it can be cleaned once.

[0039] In one embodiment of the present disclosure, see Figure 1 and Figure 2 The dirt suction port 111 of the dirt suction box 11 is provided with bristles 15, which can be evenly arranged in the extension direction of the dirt suction port 111, and the ends of the bristles 15 can abut against the filter screen 4. When cleaning impurities on the filter screen 4, the dirt suction box 11 can drive the bristles 15 to rotate synchronously to brush off the impurities on the filter screen 4, so that the dirt suction port 111 can absorb the impurities for cleaning. The bristles 15 can be made of a flexible material with a certain hardness, such as rubber, resin, etc., which will not scratch the filter screen 4 on the one hand, and can also remove impurities attached to the filter screen 4 on the other hand.

[0040] In one embodiment of the present disclosure, see Figure 1 and Figure 2The power assembly 2 includes a motor 21, a transmission chain 22 and a sprocket 23. In this embodiment, the motor 21 can be fixedly connected to the outside of the tube body 3, and two sprockets 23 are provided, one of which is provided at the transmission end of the motor 21, and the other sprocket 23 can be sleeved on the first sewage pipe 122, and the transmission chain 22 is installed between the two sprockets 23. When the filter screen 4 needs to be cleaned, the motor 21 can be started, and the sprocket 23 connected to the driving end of the motor 21 can be driven to rotate through the driving end of the motor 21, and then the sprocket 23 connected to the first sewage pipe 122 can be driven to rotate through the chain 22, and then the first sewage pipe 122 can be driven to rotate through the sprocket 23, and finally the suction box 11 can be driven to rotate relative to the filter screen 4 through the first sewage pipe 122 to clean the impurities on the filter screen 4.

[0041] When the secondary filter device of the present disclosure is in use, the filter 4 often needs to be cleaned of impurities after a period of use. The impurities on the filter 4 are mainly divided into two parts, namely, the impurities on the surface of the filter 4 and the impurities deposited on the bottom of the filter 4. When cleaning the impurities on the surface of the filter 4, the motor 21 in the power assembly 2 needs to be started first, and the first sewage pipe 122 is driven to rotate by the motor 21, the chain 22 and the sprocket 23, and at the same time, the external negative pressure source connected to the sewage outlet 121 on the second sewage pipe 123 is opened, so that the negative pressure generated by the external negative pressure source can be transmitted to the sewage suction outlet 111 on the sewage suction box 11 through the second sewage pipe 123, the first sewage pipe 122 and the connecting pipe 13. When the dirt suction box 11 rotates with the first drain pipe 122 , the bristles 15 on the dirt suction port 111 of the dirt suction box 11 will scrape the dirt on the surface of the filter screen 4 , and finally absorb it into the dirt suction box 11 through the dirt suction port 111 , and finally discharge it out of the tube body 3 through the first drain pipe 122 and the second drain pipe 123 .

[0042] When cleaning the impurities at the bottom of the filter 4, since the impurities at the bottom of the filter 4 will be deposited in the sedimentation tank 14 at the bottom of the filter 4, cleaning only requires opening the external negative pressure source connected to the third sewage pipe 124. The negative pressure generated by the external negative pressure source will absorb the impurities in the sedimentation tank 14 into the third sewage pipe 124 and finally discharge them outside the pipe body 3.

[0043] The secondary filter screen filtering device disclosed in the present invention is provided with a sewage discharge component 1 that can rotate relative to the pipe body 3. The sewage discharge pipe 12 in the sewage discharge component 1 is connected to the external negative pressure source, and the sewage discharge component 1 can also be driven to rotate by the power component 2, so that the negative pressure of impurity removal becomes controllable, thereby improving the effect of impurity removal, avoiding the impurities on the filter screen 4 that are not cleaned up and accumulate for a long time due to insufficient negative pressure, and ultimately causing a greater impact on the safe operation of the unit. In addition, the impurities on the surface and bottom of the filter screen 4 can be cleaned separately, so that the staff can choose to clean the impurities in different parts of the filter screen 4 according to the actual situation, saving time and improving the cleaning efficiency of the impurities in the filter screen 4.

[0044] The second aspect of the present disclosure further provides a condenser circulating cooling water system, including the secondary filter screen filtering device described in the above embodiment, through which the circulating cooling water of the condenser can be secondary filtered, and after impurities accumulate on the filter screen 4, they can be cleaned in time to avoid excessive impurities on the filter screen 4, which ultimately causes a greater impact on the safe operation of the unit. In this embodiment, the structure, connection relationship, positional relationship, working state and movement state of each component of the secondary filter screen filtering device during filtering are the same as the secondary filter screen filtering device in the above description of the present disclosure, and will not be repeated here.

[0045] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0046] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0047] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A secondary filter screen filtering device, comprising a tube body and a filter screen located in the tube body, characterized in that: include: A sewage discharge component, the sewage discharge component includes a sewage suction box and a sewage discharge pipe, the sewage suction box is fixedly connected to the sewage discharge pipe and includes a sewage suction port, the sewage suction port is used to suck impurities on the filter screen, the sewage discharge pipe is connected to the sewage suction box, and the sewage discharge pipe is provided with a sewage discharge port, and the sewage discharge port is connected to a negative pressure source; as well as A power assembly is in transmission connection with the sewage discharge assembly and is used to drive the sewage discharge assembly to rotate relative to the filter screen.

2. The secondary filter screen filtering device according to claim 1, characterized in that: The dirt suction box is strip-shaped and is connected to the sewage discharge pipe through a connecting pipe. One end of the connecting pipe is fixedly connected to the dirt suction box, and the other end is fixedly connected to the sewage discharge pipe.

3. The secondary filter screen filtering device according to claim 2, characterized in that: The filter screen is conical, the dirt suction box is tilted, and a plurality of connecting pipes are provided, which are spaced apart along the extending direction of the dirt suction box.

4. The secondary filter screen filtering device according to claim 1, characterized in that: The sewage pipe includes a first sewage pipe and a second sewage pipe. The first sewage pipe extends in a vertical direction and is transmission-connected to the power assembly and can rotate relative to the filter. The second sewage pipe is fixedly connected to the pipe body. One end of the second sewage pipe is connected to the first sewage pipe, and the other end forms the sewage outlet and is connected to the negative pressure source.

5. The secondary filter screen filtering device according to claim 4, characterized in that: The first sewage discharge pipe is rotatably connected to the pipe body via a bearing, the first sewage discharge pipe is fixedly connected to the outer ring of the bearing, and the second sewage discharge pipe is fixedly connected to the inner ring of the bearing.

6. The secondary filter screen filtering device according to claim 1, characterized in that: The sewage pipe includes a third sewage pipe, one end of which is connected to the bottom of the filter screen, and the other end is connected to the negative pressure source. The third sewage pipe is used to discharge impurities at the bottom of the filter screen.

7. The secondary filter screen filtering device according to claim 6, characterized in that: A sedimentation tank is arranged at the bottom of the filter screen, an open end of the sedimentation tank is communicated with the bottom of the filter screen, and the third sewage pipe is communicated with the sedimentation tank.

8. The secondary filter screen filtering device according to claim 1, characterized in that: Brushes are arranged at the sewage suction port, and the ends of the brushes abut against the filter screen to scrape off impurities on the filter screen.

9. The secondary filter screen filtering device according to claim 1, characterized in that: The power assembly includes a motor, a transmission chain and a sprocket. The sprocket is fixedly connected to the sewage pipe. The motor is used to drive the sewage pipe to rotate through the transmission chain and the sprocket.

10. A condenser circulating cooling water system, characterized in that: A secondary filter screen filtering device comprising any one of claims 1-9.

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