A waste heat recovery heat exchanger

Abstract

This invention discloses a waste heat recovery heat exchanger, belonging to the field of heat exchange equipment, including a shell and a U-shaped heat-conducting pipe; the heat-conducting pipe is disposed inside the shell, and its two ends penetrate the same side wall of the shell; an air inlet and an exhaust outlet are respectively opened on the top and bottom walls of the shell; a support plate for inserting and supporting the heat-conducting pipe is fixed inside the shell; this solution uses the kinetic energy of the exhaust gas to drive the wind cup, which drives the mounting bracket and the baffle rod to rotate continuously, changing the traditional static obstruction into dynamic active turbulence, dispersing the high-speed airflow and changing its flow direction, weakening the direct impact and wear of the gas-solid two-phase flow on the heat-conducting pipe; at the same time, in conjunction with the rigid support plate inside the shell and the universal support ball embedded in the cantilever end of the baffle rod, the flow-induced vibration of the heat-conducting pipe caused by the airflow impact is suppressed, and a stable dynamic radial support is provided for the baffle mechanism, thereby eliminating the cantilever end vibration and stress concentration of the internal components.

Description

Technical Field

[0001] This invention relates to the field of heat exchange equipment, and more specifically, to a waste heat recovery heat exchanger. Background Technology

[0002] In the field of industrial waste heat recovery and high-temperature heat exchange treatment, equipment such as shell-and-tube heat exchangers are usually used to cool down high-temperature dusty waste gas.

[0003] However, under actual industrial operating conditions, existing heat exchange equipment generally suffers from the following technical defects: when high-temperature dusty exhaust gas is introduced into the front-end tube box from the inlet pipe, due to the sudden expansion of the flow cross-sectional area, the high-speed airflow will form a strong central jet effect, thereby causing multiple coupled failure and degradation problems such as erosion, flow deviation and tube bundle vibration.

[0004] Specifically, this manifests as follows: high-speed airflow carrying a large number of solid particles directly impacts the heat exchanger tube bundle facing the inlet area, generating severe gas-solid two-phase erosion and wear. This high-intensity physical damage leads to rapid thinning of the heat exchanger tube wall thickness on the windward side, and even perforation and rupture. Furthermore, the high-speed frontal impact and flow around the fluid easily induce high-frequency, minute flow-induced vibrations in the tube bundle. Under long-term alternating vibration stress, severe stress concentrations easily occur at the weak connections between the heat exchanger tubes and the tube sheet (usually welded or expanded structures). More critically, as the equipment's operating cycle extends, the degree of localized corrosion deepens. Under the coupled effect of metal fatigue and media corrosion, irreversible fatigue cracks eventually develop at the connection, directly causing cross-leakage of the tube-side and shell-side media, leading to complete equipment failure and serious safety hazards.

[0005] Therefore, a waste heat recovery heat exchanger is proposed. Summary of the Invention

[0006] In view of the problems existing in the prior art, the purpose of this invention is to provide a waste heat recovery heat exchanger that can reduce the airflow impact force on the heat conduction tube.

[0007] To solve the above problems, the present invention adopts the following technical solution.

[0008] A waste heat recovery heat exchanger includes a shell and a U-shaped heat-conducting pipe;

[0009] The heat pipe is installed inside the shell, and its two ends penetrate the same side wall of the shell; the top wall and bottom wall of the shell are respectively provided with air inlet and air outlet;

[0010] A support plate for inserting and supporting the heat-conducting pipe is fixed inside the shell;

[0011] An annular mounting bracket is rotatably embedded on the inner end face of the housing. A turbulence-disrupting rod is uniformly fixed on the side wall of the mounting bracket along the circumference. The end of the turbulence-disrupting rod away from the mounting bracket slides against the inner side wall of the housing.

[0012] The housing is equipped with a pneumatic rotating mechanism that drives the mounting bracket to rotate;

[0013] Multiple spoiler bars are fixedly fitted with an external gear ring on their outer sides, and the pneumatic rotation mechanism includes a drive gear that meshes with the external gear ring.

[0014] Furthermore, the pneumatic rotary mechanism also includes a rotating rod that is horizontally rotatably installed in the exhaust port, and a drive gear is fixedly sleeved on the rotating rod;

[0015] Several wind cups are evenly arranged along the circumference of the rotating rod.

[0016] Furthermore, a first brush made of flexible material is uniformly fixed on the side wall of the baffle rod near the heat pipe, and the end of the first brush away from the baffle rod slides against the outer wall of the heat pipe.

[0017] Furthermore, a protrusion is fixedly installed on the end face of the support plate facing the mounting frame, and an elastic plate adapted to the protrusion is installed on the side wall of the outer gear ring. An impact ball that cooperates with the protrusion is fixed to the end of the elastic plate.

[0018] Furthermore, a centrifugal speed limiting component is provided between the wind cup and the rotating rod;

[0019] The centrifugal speed limiting assembly includes several folding support rods that are circumferentially hinged along the outer wall of the rotating rod, and the wind cup is fixedly installed at the end of the folding support rods; a return spring is obliquely connected between the folding support rods and the rotating rod.

[0020] Furthermore, a bracket is horizontally fixedly installed inside the air intake, and a vertical insertion hole is opened at the bottom of the bracket, into which a downwardly extending push rod is rotatably inserted.

[0021] The bottom end of the push rod is fixedly connected to a cone-shaped guide block with its tip pointing upwards, and the cone-shaped guide block is directly opposite the center area of ​​the air intake.

[0022] Furthermore, the conical guide block has inclined guide grooves evenly distributed along its sidewall in the circumferential direction;

[0023] Furthermore, a support ball is universally embedded on the end face of the spoiler away from the mounting bracket, and the spoiler maintains rolling contact with the inner wall of the housing through the support ball.

[0024] Furthermore, the surface of the spoiler bar is provided with several grooves, which are distributed in an alternating pattern.

[0025] Furthermore, a second brush that cooperates with the spoiler is fixedly installed on the inner bottom wall of the housing. The second brush is distributed along the extension direction of the spoiler. The flexible bristles of the second brush slide against the surface of the spoiler.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0027] (1) This scheme uses the exhaust gas kinetic energy to drive the wind cup, which drives the mounting bracket and the baffle rod to rotate continuously, changing the traditional static obstruction into a dynamic active baffle, which disperses the high-speed intake airflow and changes its flow direction, weakening the direct impact and wear of the gas-solid two-phase flow on the heat pipe; at the same time, in conjunction with the rigid support plate inside the shell and the universal support ball embedded in the cantilever end of the baffle rod, it suppresses the flow-induced vibration of the heat pipe caused by the airflow impact, and also provides a stable dynamic radial support for the baffle mechanism, thereby eliminating the cantilever end shaking and stress concentration of the internal components.

[0028] (2) In this scheme, a conical guide block with a spiral guide groove is suspended directly below the air inlet. This block can convert the linear kinetic energy of the high-speed airflow downward into a tangential component force, driving the guide block to rotate synchronously without power. Through this dynamic rotational centrifugal pumping action, the originally highly concentrated and extremely destructive longitudinal high-speed central jet is actively and gently dispersed radially to the surrounding area and transformed into a gentle swirling flow. This expands the effective heat exchange area of ​​the high-temperature airflow and reduces the local excitation force borne by the heat pipe on the windward side.

[0029] (3) This solution links the transmission mechanism with the dust removal function. During the rotation of the turbulence mechanism, the first brush continuously and flexibly scrapes the outer wall of the heat pipe, and the elastic impact ball on the outer gear ring continuously strikes the protrusion. Through the dual physical action of "brushing + vibration", the stubborn dust on the surface of the heat pipe is peeled off and shaken off. In addition, the interlaced grooves on the surface of the turbulence rod induce local vortices to disperse the airflow, and can also achieve deep scraping of the dust in the groove through the second brush fixed on the bottom wall in relative sliding, ensuring that the equipment has long-term, stable high heat exchange efficiency under harsh dust conditions.

[0030] (4) In response to the common phenomenon of sudden surge in high-pressure exhaust gas in industrial operation, this solution sets up a centrifugal speed limiting component based on folding support rod and reset tension spring between the wind cup and the rotating rod. When the exhaust gas velocity is abnormally high, the excessive centrifugal force generated by the high-speed rotation of the wind cup will overcome the resistance of the tension spring and cause the support rod to fold outward, thereby adaptively changing the windward angle and reducing the wind-receiving projection area. This realizes the passive "unloading" speed limiting of the pneumatic rotating mechanism in the overspeed state, and prevents mechanical damage to the drive gear, external gear ring and internal rotating components due to overload impact. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the combined structure of the mounting bracket and the spoiler bar of the present invention;

[0032] Figure 2 This is a front cross-sectional view of the housing of the present invention;

[0033] Figure 3 For the present invention Figure 2 Enlarged structural diagram at point A;

[0034] Figure 4 This is a schematic diagram of the combined structure of the wind cup, folding support rod, and return spring of the present invention;

[0035] Figure 5 For the present invention Figure 2 Enlarged structural diagram at point B;

[0036] Figure 6 For the present invention Figure 2 Enlarged structural diagram at point C;

[0037] Figure 7 For the present invention Figure 1 Enlarged structural diagram at point D;

[0038] Figure 8 This is a schematic diagram of the combined structure of the baffle rod, supporting balls, and inner wall of the housing according to the present invention;

[0039] Figure 9 This is a schematic diagram of the combined structure of the turbulence rod and the flow guide groove of the present invention.

[0040] Explanation of the labels in the diagram:

[0041] 1. Shell; 2. Heat pipe; 3. Protective cover; 4. Partition; 5. Water inlet; 6. Drain outlet; 7. Air inlet; 8. Exhaust outlet; 9. Support plate; 10. Mounting bracket; 11. Baffle rod; 12. External gear ring; 13. Drive gear; 14. Rotating rod; 15. Wind cup; 16. First brush; 17. Protrusion; 18. Elastic sheet; 19. Impact ball; 20. Folding support rod; 21. Return spring; 22. Bracket; 23. Top rod; 24. Conical guide block; 25. Guide groove; 26. Second brush; 27. Support ball. Detailed Implementation

[0042] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0043] Example 1:

[0044] Please see Figures 1 to 9 A waste heat recovery heat exchanger includes a shell 1 and a heat exchange tube bundle consisting of multiple U-shaped heat-conducting tubes 2;

[0045] The heat pipe 2 is installed inside the housing 1, and its two ends penetrate the same side wall of the housing 1; a protective cover 3 is fixedly installed on the end face of the housing 1, and the protective cover 3 covers the end of the heat pipe 2; a partition 4 is fixedly provided between the inner side wall of the protective cover 3 and the end face of the housing 1, and the partition 4 is located between the two ends of the heat pipe 2; on the side wall of the protective cover 3, a water inlet 5 and a water outlet 6 are respectively opened on the upper and lower sides of the partition 4.

[0046] An air inlet 7 and an exhaust outlet 8 are respectively provided on the top and bottom walls of the housing 1;

[0047] The housing 1 is fixedly provided with a support plate 9 for inserting and supporting the heat pipe 2. The support plate 9 is fixedly connected to the heat pipe 2, which improves the fixing effect of the heat pipe 2, thereby suppressing the shaking of the heat pipe 2 caused by the airflow impact when the heat pipe 2 is subjected to the airflow impact force.

[0048] An annular mounting bracket 10 is rotatably embedded in the inner end face of the housing 1. A turbulence rod 11 is uniformly fixedly installed on the side wall of the mounting bracket 10 along the circumference. The end of the turbulence rod 11 away from the mounting bracket 10 slides against the inner side wall of the housing 1.

[0049] The housing 1 is equipped with a pneumatic rotating mechanism that drives the mounting bracket 10 to rotate;

[0050] Multiple spoiler rods 11 are fixedly fitted with an outer gear ring 12 on their outer sides, and the pneumatic rotation mechanism includes a drive gear 13 that meshes with the outer gear ring 12.

[0051] The pneumatic rotary mechanism also includes a rotating rod 14 that is horizontally rotatably installed in the exhaust port 8, and a drive gear 13 that is fixedly sleeved on the rotating rod 14;

[0052] Several wind cups 15 are evenly arranged along the circumference of the rotating rod 14. When the exhaust gas flows out through the exhaust port 8 and impacts the wind cups 15, the wind cups 15 drive the rotating rod 14 to rotate, which in turn drives the outer gear ring 12 to rotate through the drive gear 13.

[0053] When exhaust gas enters the housing 1 through the air inlet 7, the airflow first impacts the baffle rod 11; then it contacts the heat pipe 2 for heat exchange, and finally exits through the exhaust port 8; the ratio of the inner diameter of the air inlet 7 to the inner diameter of the exhaust port 8 is 1.5-2. This allows the airflow at the exhaust port 8 to achieve a higher exhaust velocity under the same intake volume, thereby providing stronger aerodynamic energy for driving the wind cup 15;

[0054] When the airflow is discharged through the exhaust port 8, the wind cup 15 drives the rotating rod 14 to rotate, which in turn drives the mounting bracket 10 and the baffle rod 11 to rotate through the meshing external gear ring 12 and the drive gear 13. When the airflow comes into contact with the baffle rod 11, since the baffle rod 11 is in a rotating state, it can change the direction of the airflow entering through the air inlet 7, thereby reducing the direct impact of the high-speed airflow on the surface of the heat pipe 2 and effectively weakening the impact of impurities carried in the airflow on the heat pipe 2, thus protecting the heat pipe 2 and extending its service life.

[0055] like Figure 1 , Figure 2 As shown, a first brush 16 of flexible material is uniformly fixed on the side wall of the baffle rod 11 near the heat pipe 2. The first brush 16 is preferably made of extremely fine and soft flexible bristles. The end of the first brush 16 away from the baffle rod 11 keeps lightly touching and sliding with the outermost outer wall of the heat pipe 2. Through continuous rotation and brushing, the airflow boundary layer on the surface of the heat pipe 2 is disturbed, and the surface dust is dislodged.

[0056] As the drive gear 13 drives the outer gear ring 12 and the mounting bracket 10 to rotate, the first brush 16 rotates around the heat pipe 2 and continuously scrapes the outer wall and leeward side area of ​​the heat pipe 2 to remove the fine dust adhering to the surface of the heat pipe 2.

[0057] like Figure 5 , Figure 7 As shown, a protrusion 17 is fixedly installed on the end face of the support plate 9 facing the mounting bracket 10. An elastic plate 18 adapted to the protrusion 17 is installed on the side wall of the outer gear ring 12. An impact ball 19 that cooperates with the protrusion 17 is fixed at the end of the elastic plate 18. During the rotation of the outer gear ring 12, the impact ball 19 can continuously impact the protrusion 17, and then transmit the impact force to the heat pipe 2 through the support plate 9, so that the dust on the surface of the heat pipe 2 is shaken off.

[0058] like Figure 4 As shown, a centrifugal speed limiting component is provided between the wind cup 15 and the rotating rod 14;

[0059] The centrifugal speed limiting assembly includes several folding support rods 20 that are circumferentially hinged along the outer wall of the rotating rod 14, and the wind cup 15 is fixedly installed at the end of the folding support rods 20; a return spring 21 is obliquely connected between the folding support rods 20 and the rotating rod 14.

[0060] When the exhaust gas velocity is too high, the centrifugal force generated by the high-speed rotation of the fan cup 15 with the rotating rod 14 overcomes the tension of the reset spring 21, causing the folding support rod 20 to deflect and fold outward, thereby changing the windward angle of the fan cup 15 and reducing the windward projected area, realizing passive speed limiting under overspeed conditions, and protecting the internal mechanical structure of the heat exchanger from damage caused by high-speed airflow.

[0061] like Figure 6 As shown, a bracket 22 is horizontally fixedly installed inside the air inlet 7. A vertical insertion hole is provided at the bottom of the bracket 22, and a downwardly extending push rod 23 is rotatably inserted into the insertion hole.

[0062] The bottom end of the top rod 23 is fixedly connected to a cone-shaped guide block 24 with its tip pointing upwards. The cone-shaped guide block 24 is directly opposite the central area of ​​the air inlet 7, which is used to disperse the vertically injected high-speed airflow in the center radially to the surrounding areas, thereby reducing the direct impact of the airflow on the heat pipe 2 directly below.

[0063] The conical guide block 24 has inclined guide grooves 25 evenly distributed along the circumference of its side wall;

[0064] When the high-speed longitudinal airflow discharged from the air inlet 7 flows downward and enters the guide groove 25, the airflow generates a tangential force on the inclined sidewall of the guide groove 25, driving the conical guide block 24 and the push rod 23 to rotate synchronously. Through the centrifugal effect of the rotation of the conical guide block 24, the high-speed longitudinal jet is further dispersed and transformed into a gentle swirling flow, thereby expanding the airflow buffer range and reducing the local excitation force of the airflow on the heat pipe 2.

[0065] like Figure 8 As shown, a support ball 27 is universally embedded on the end face of the spoiler 11 away from the mounting bracket 10, and the spoiler 11 maintains rolling contact with the inner wall of the housing 1 through the support ball 27. During the process of the spoiler 11 rotating and disturbing the airflow, the support ball 27 provides dynamic radial support for the cantilevered spoiler 11 to suppress the cantilever end vibration generated by the spoiler 11 under the impact of airflow.

[0066] like Figure 9 As shown, the surface of the deflector 11 is provided with several grooves, which are distributed in an alternating manner. As the deflector 11 rotates with the mounting frame 10, the sidewalls of the grooves are used to block and deflect dust in the airflow, thereby further enhancing the disturbance and dispersion effect on the airflow.

[0067] like Figure 3 As shown, a second brush 26 that cooperates with the baffle rod 11 is fixedly installed on the inner bottom wall of the housing 1. The second brush 26 is distributed along the extension direction of the baffle rod 11. The flexible bristles of the second brush 26 slide against the surface of the baffle rod 11 and are configured to extend into the groove and scrape off the dust adhering to the surface when the baffle rod 11 rotates through it.

[0068] By creating staggered grooves on the surface of the baffle rod 11, when dust-laden exhaust gas impacts the rotating baffle rod 11, the groove structure can disrupt the fluid adhesion layer on the surface of the rod and induce local eddies. This further disperses the airflow and buffers its direct impact on the heat pipe 2 behind it.

[0069] Furthermore, as the deflector bar 11 rotates continuously with the annular mounting bracket 10 and passes through the inner bottom wall of the housing 1, the fixedly mounted second brush 26 slides relative to the surface of the deflector bar 11. During the smooth contact process, the flexible bristles of the second brush 26 can smoothly penetrate into each groove and thoroughly scrape away the dust and impurities deposited therein, thereby ensuring the long-term, stable deflection performance and self-cleaning ability of the equipment.

[0070] Instructions for use: When the exhaust gas flows out through the exhaust port 8 and impacts the fan cup 15, the fan cup 15 drives the rotating rod 14 to rotate, which in turn drives the external gear ring 12 to rotate through the drive gear 13.

[0071] When the exhaust gas enters the housing 1 through the air inlet 7, the airflow first impacts the baffle rod 11; then it contacts the heat pipe 2 for heat exchange, and finally is discharged through the exhaust port 8.

[0072] When the airflow is discharged through the exhaust port 8, the wind cup 15 drives the rotating rod 14 to rotate, which in turn drives the mounting bracket 10 and the baffle rod 11 to rotate through the meshing external gear ring 12 and the drive gear 13. When the airflow comes into contact with the baffle rod 11, the baffle rod 11 is in a rotating state, which can change the direction of the airflow entering through the air inlet 7, thereby reducing the direct impact of the high-speed airflow on the surface of the heat pipe 2 and effectively weakening the impact force of impurities carried in the airflow on the heat pipe 2, thus protecting the heat pipe 2 and extending its service life. When the longitudinal high-speed airflow entering through the air inlet 7 flows downward and enters the guide groove 25, the airflow generates a tangential component force on the inclined sidewall of the guide groove 25, driving the conical guide block 24 and the top rod 23 to rotate synchronously. Through the centrifugal action of the rotation of the conical guide block 24, the longitudinal high-speed jet is further dispersed and transformed into a gentle vortex, thereby expanding the airflow buffer range and reducing the local excitation force of the airflow on the heat pipe 2.

[0073] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concepts, should be covered within the scope of protection of the present invention.

Claims

1. A waste heat recovery heat exchanger, comprising a shell (1) and a heat exchange tube bundle consisting of a plurality of U-shaped heat-conducting tubes (2); Its features are: The heat pipe (2) is disposed inside the housing (1), and its two ends penetrate the same side wall of the housing (1); a protective cover (3) is installed on the end face of the housing (1); a partition (4) is provided between the inner side wall of the protective cover (3) and the end face of the housing (1); a water inlet (5) and a drain outlet (6) are respectively opened on the side wall of the protective cover (3) on the upper and lower sides of the partition (4); an air inlet (7) and an exhaust outlet (8) are respectively opened on the top and bottom walls of the housing (1). A bracket (22) is horizontally fixedly installed inside the air inlet (7). A vertical insertion hole is provided at the bottom of the bracket (22), and a downwardly extending top rod (23) is rotatably inserted into the insertion hole. The bottom end of the top rod (23) is fixedly connected to a cone-shaped guide block (24) with its tip pointing upwards, and a guide groove (25) is inclinedly opened on the side wall of the cone-shaped guide block (24). The housing (1) is fixedly provided with a support plate (9) for inserting and supporting the heat pipe (2). The inner end face of the housing (1) is rotatably fitted with an annular mounting bracket (10), and a turbulence rod (11) is uniformly fixedly installed on the side wall of the mounting bracket (10) along the circumferential direction. The end of the turbulence rod (11) away from the mounting bracket (10) slides against the inner side wall of the housing (1). The housing (1) is provided with a pneumatic rotation mechanism that drives the mounting bracket (10) to rotate; An external gear ring (12) is fixedly sleeved on the outer side of multiple of the aforementioned spoiler rods (11), and the pneumatic rotation mechanism includes a drive gear (13) that meshes with the external gear ring (12).

2. The waste heat recovery heat exchanger according to claim 1, characterized in that: The pneumatic rotating mechanism also includes a rotating rod (14) that is horizontally rotatably installed in the exhaust port (8), and the driving gear (13) is fixedly sleeved on the rotating rod (14); Several wind cups (15) are evenly arranged along the circumference of the rotating rod (14).

3. A waste heat recovery heat exchanger according to claim 2, characterized in that: A flexible first brush (16) is uniformly fixed on the side wall of the turbulence rod (11) near the heat pipe (2). The end of the first brush (16) away from the turbulence rod (11) slides against the outer wall of the outermost heat pipe (2).

4. A waste heat recovery heat exchanger according to claim 3, characterized in that: A protrusion (17) is fixedly installed on the end face of the support plate (9) facing the mounting bracket (10). An elastic plate (18) adapted to the protrusion (17) is installed on the side wall of the external gear ring (12). An impact ball (19) that cooperates with the protrusion (17) is fixed at the end of the elastic plate (18).

5. A waste heat recovery heat exchanger according to claim 4, characterized in that: A centrifugal speed limiting component is provided between the wind cup (15) and the rotating rod (14); The centrifugal speed limiting assembly includes a plurality of folding support rods (20) hinged circumferentially along the outer wall of the rotating rod (14), and the wind cup (15) is fixedly installed at the end of the folding support rods (20); a return spring (21) is obliquely connected between the folding support rods (20) and the rotating rod (14).

6. A waste heat recovery heat exchanger according to claim 1, characterized in that: The conical guide block (24) is directly opposite the central area of ​​the air inlet (7).

7. A waste heat recovery heat exchanger according to claim 6, characterized in that: The guide grooves (25) are evenly distributed in a spiral shape along the circumference on the side wall of the conical guide block (24).

8. A waste heat recovery heat exchanger according to claim 7, characterized in that: The spoiler (11) has a universally embedded support ball (27) on one end face away from the mounting bracket (10), and the spoiler (11) maintains rolling contact with the inner wall of the housing (1) through the support ball (27).

9. A waste heat recovery heat exchanger according to claim 1, characterized in that: The surface of the spoiler rod (11) is provided with several grooves, and the grooves are distributed in an alternating manner.

10. A waste heat recovery heat exchanger according to claim 1, characterized in that: A second brush (26) that cooperates with the deflector rod (11) is fixedly installed on the inner bottom wall of the housing (1). The second brush (26) is distributed along the extension direction of the deflector rod (11). The flexible bristles of the second brush (26) slide and adhere to the surface of the deflector rod (11).

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