Turbine flowmeter

Abstract

The invention belongs to the technical field of flow meters, and particularly relates to a turbine flow meter which comprises a flow meter body, the right side of the flow meter body is fixedly connected with a liquid inlet pipe, the right end of the liquid inlet pipe is fixedly connected with a fixing cylinder, the right side of the fixing cylinder is fixedly connected with a connecting pipe, and the right end of the connecting pipe is fixedly connected with a pretreatment box. The right side of the pretreatment box is fixedly connected with a feeding pipe. By arranging the pretreatment box, the mixing assembly, the stirring plate, a cutting knife and a shifting plate, the shifting plate is pushed by kinetic energy of fluid to drive a rotating rod to rotate, then the stirring plate is driven to move up and down repeatedly, uniform mixing of various media is achieved, the flow velocity distribution of the fluid is uniform before the fluid enters the flowmeter body, and the rotating stability of turbine blades is guaranteed; the flow measurement precision is improved; and meanwhile, the cutting knives on the outer sides of the stirring plates can cut large-particle solids in the fluid into fine particles, so that impact and abrasion to turbine blades are reduced, and the service life of the device is prolonged.

Description

Technical Field

[0001] This invention belongs to the field of flow meter technology, specifically a turbine flow meter. Background Technology

[0002] A turbine flow meter is a flow measurement device based on the principle of fluid momentum. It is widely used in industries such as petroleum, chemical, water supply and drainage, and food processing to accurately measure the instantaneous and cumulative flow of liquids, gases, and other fluids. Its core working logic is that the fluid drives the turbine blades to rotate, converting the fluid's kinetic energy into the turbine's mechanical energy. Then, a sensor converts the rotation signal into an electrical signal, thereby achieving flow measurement.

[0003] In practical applications, turbine flow meters have the following drawbacks: Industrial fluids often contain a mixture of multiple media (such as liquids of different compositions or fluids containing suspended solid particles). Uneven mixing of the media can lead to an imbalance in the fluid velocity distribution, which in turn affects the stability of turbine rotation and causes flow measurement errors. Large solid impurities in the fluid can not only accelerate the wear of turbine blades but may also jam turbine rotating parts, leading to flow meter malfunctions. In addition, after long-term use, the internal filter structure of the flow meter is easily clogged by impurities, requiring shutdown for disassembly and cleaning, which affects the continuity of operation. At the same time, traditional turbine flow meters lack targeted media pretreatment functions, making it difficult to adapt to the accurate measurement needs of fluids with complex compositions. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a turbine flow meter that solves the problems mentioned in the background art, such as uneven mixing, impurities affecting measurement accuracy, flow meter wear, and easy clogging of the filter structure when measuring fluids with complex compositions.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A turbine flow meter includes a flow meter body, an inlet pipe fixedly connected to the right side of the flow meter body, a fixed cylinder fixedly connected to the right end of the inlet pipe, a connecting pipe fixedly connected to the right side of the fixed cylinder, a pretreatment box fixedly connected to the right end of the connecting pipe, a feed pipe fixedly connected to the right side of the pretreatment box, and a processing unit provided inside the pretreatment box. The processing unit includes a mixing component for uniformly mixing the fluid.

[0006] Preferably, the mixing component includes a connecting frame, which is fixedly connected to the inner side of the pretreatment box. A filter screen is provided in the middle of the connecting frame. Guide plates are fixedly connected to the right side of the connecting frame and the right inner wall of the pretreatment box. Two symmetrically distributed guide blocks are slidably connected to the outer side of the guide plates. A lifting plate is fixedly connected to the outer side of the guide blocks.

[0007] Preferably, a connecting plate is fixedly connected between the lifting plates on the left and right sides. A sliding groove is provided on the upper side of the connecting plate. A slider is slidably connected to the inner side of the sliding groove. A control rod is rotatably connected to the outer side of the slider. One end of the control rod passes through the outer side of the slider and is fixedly connected to a turntable. Multiple stirring plates are fixedly connected to the outer side of the turntable. Cutting blades are fixedly connected to the outer side of the multiple stirring plates.

[0008] Preferably, a movable block is fixedly connected to the front side of the slider, a rotating shaft is rotatably connected to the upper side of the movable block, a large gear is fixedly connected to the outer side of the rotating shaft, a small gear that meshes with the large gear is fixedly connected to the other end of the control rod, a fixed rod is fixedly connected to the upper side of the connecting plate, a toothed plate that meshes with the large gear is fixedly connected to the upper end of the fixed rod, and sealing plates are fixedly connected to both the left and right sides of the slider.

[0009] Preferably, a base plate is fixedly connected to both the front and rear sides of the slider, a rotating block one is fixedly connected to the outer side of the base plate, an inclined plate is rotatably connected to the outer side of the rotating block one, a rotating block two is fixedly connected to the right side of the connecting frame, and the rotating block two and the inclined plate are rotatably connected.

[0010] Preferably, lifting blocks are fixedly connected to the outer sides of the upper and lower lifting plates, the outer ends of the lifting blocks pass through the outer side of the pretreatment box and are fixedly connected to a reciprocating plate, and a spring is fixedly connected between the reciprocating plate and the pretreatment box.

[0011] Preferably, a stop rod is fixedly connected to the outer side of the rear end of the reciprocating plates on both the upper and lower sides. A rotating rod is rotatably connected to the inner side of the fixed cylinder. A toggle plate is fixedly connected to the outer side of the rotating rod. The rear end of the rotating rod passes through the rear side of the fixed cylinder and is fixedly connected to a control disk. A control block is fixedly connected to the outer side of the control disk. A control plate is rotatably connected to the outer side of the control block. A mounting plate is rotatably connected to the outer side of the control plate. A fixed cover is fixedly connected to the rear side of the fixed cylinder. The mounting plate is slidably connected to the fixed cover. A trapezoidal block is fixedly connected to the outer side of the mounting plate, and the trapezoidal block abuts against the stop rod.

[0012] Preferably, a backflush pipe is fixedly connected between the liquid inlet pipe and the feed pipe. A solenoid valve four is provided on the outside of the backflush pipe. A solenoid valve two is provided on the outside of the feed pipe to the left of the backflush pipe. A drain pipe is fixedly connected to the lower side of the feed pipe to the left of the solenoid valve two. A solenoid valve three is provided on the outside of the drain pipe. A solenoid valve one is provided on the outside of the liquid inlet pipe to the left of the backflush pipe.

[0013] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention sets up a pretreatment box, a mixing component, a stirring plate, a cutting blade and a deflecting plate. The fluid itself uses its own kinetic energy to drive the deflecting plate to drive the rotating rod to rotate, thereby driving the stirring plate to move up and down repeatedly, so as to achieve uniform mixing of multiple media, so that the flow velocity distribution of the fluid is uniform before entering the main body of the flow meter, ensuring the stability of the turbine blade rotation and improving the flow measurement accuracy. At the same time, the cutting blade on the outside of the stirring plate can cut large solid particles in the fluid into small particles, reducing the impact and wear on the turbine blade and extending the service life of the present invention.

[0014] (2) By setting up a slider, a large gear, a small gear, a toothed plate and an inclined plate, the inclined plate drives the slider to move left and right repeatedly while the stirring plate moves up and down. With the meshing transmission of the toothed plate and the gear, the stirring plate can be rotated at high speed, which not only enhances the mixing effect of the medium, but also improves the cutting efficiency of solid particles, making the fluid composition more uniform and the impurity particle size smaller, and further optimizing the measurement environment.

[0015] (3) By setting up a filter screen, a backwash pipe, a drain pipe and multiple solenoid valves, the filter screen can filter impurities in the fluid and prevent impurities from entering the flow meter body and jamming the turbine components. When the pressure sensor detects that the pressure difference on both sides of the filter screen reaches the set threshold, the controller can automatically close solenoid valve one and solenoid valve two, open solenoid valve three and solenoid valve four, and use external clean water to backwash the filter screen through the backwash pipe. Impurities are discharged through the drain pipe without stopping the machine for disassembly, ensuring the continuity of operation. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 This is a partial three-dimensional structural diagram of the present invention; Figure 3 This is a three-dimensional structural diagram of the hybrid component of the present invention; Figure 4 This is a first-view partial three-dimensional structural diagram of the hybrid component of the present invention; Figure 5 This is a partial three-dimensional structural diagram of the hybrid component of the present invention from a second perspective; Figure 6 This is a cross-sectional perspective view of the processing unit of the present invention. Figure 7 for Figure 6 Enlarged structural diagram at point A; Figure 8 for Figure 6 A magnified structural diagram at point B in the middle.

[0017] In the diagram: 1. Flow meter body; 2. Inlet pipe; 3. Fixed cylinder; 4. Connecting pipe; 5. Pretreatment box; 6. Feed pipe; 7. Processing unit; 71. Rotating rod; 72. Actuating plate; 73. Fixed cover; 74. Mixing assembly; 75. Solenoid valve one; 76. Backflush pipe; 77. Solenoid valve two; 78. Drain pipe; 79. Solenoid valve three; 710. Solenoid valve four; 741. Connecting frame; 742. Filter screen; 743. Guide plate; 744. Guide block; 745. Lifting plate; 746. Connecting plate; 747. Slide groove; 748. Sliding block; 749. Control rod; 7410 7411. Small gear; 7412. Moving block; 7413. Rotating shaft; 7414. Large gear; 7415. Fixed rod; 7416. Gear plate; 7417. Turntable; 7418. Stirring plate; 7419. Cutting blade; 7420. Sealing plate; 7421. Base plate; 7422. Rotating block one; 7423. Inclined plate; 7424. Rotating block two; 7425. Lifting block; 7426. Reciprocating plate; 7427. Spring; 7428. Push rod; 7429. Trapezoidal block; 7430. Control panel; 7431. Control block; 7432. Mounting plate. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] This invention provides the following technical solutions: Example 1 like Figures 1-8 As shown, a turbine flow meter includes a flow meter body 1. An inlet pipe 2 is fixedly connected to the right side of the flow meter body 1. A fixed cylinder 3 is fixedly connected to the right end of the inlet pipe 2. A connecting pipe 4 is fixedly connected to the right side of the fixed cylinder 3. A pretreatment tank 5 is fixedly connected to the right end of the connecting pipe 4. A feed pipe 6 is fixedly connected to the right side of the pretreatment tank 5. A processing unit 7 is disposed inside the pretreatment tank 5. The processing unit 7 includes a mixing component 74, which is used to uniformly mix the fluid. When fluid flow rate needs to be measured, the invention is activated. The fluid enters the flow meter body 1 through the feed pipe 6, pretreatment tank 5, connecting pipe 4, fixed cylinder 3, and inlet pipe 2. The fluid drives the turbine blades in the turbine measuring component to rotate. A signal sensor converts the rotation signal into an electrical signal and transmits it to an external instrument, thereby achieving flow measurement.

[0020] It should be noted that the inner side of the flow meter body 1 is also equipped with a turbine measuring component (not shown in the figure) for converting fluid kinetic energy into a rotational signal to achieve flow measurement. When the pre-treated fluid enters the flow meter body 1, the fluid drives the turbine blades to rotate, and the turbine shaft rotates synchronously with the turbine blades. A signal sensor (such as a Hall sensor) detects the rotational frequency of the turbine blades, converts it into an electrical signal, and transmits it to an external flow display instrument. The external flow display instrument calculates the instantaneous flow rate and cumulative flow rate of the fluid according to a preset calibration coefficient, thus completing accurate measurement. The turbine measuring component uses existing technology and will not be described in detail here.

[0021] The mixing component 74 includes a connecting frame 741, which is fixedly connected to the inner side of the pretreatment tank 5. A filter screen 742 is disposed in the middle of the connecting frame 741. The filter screen 742 is made of high-strength stainless steel and its surface is coated with a wear-resistant and corrosion-resistant coating, which can effectively filter impurities in the fluid and resist fluid corrosion. Guide plates 743 are fixedly connected to the right side of the connecting frame 741 and the right inner wall of the pretreatment tank 5. Two symmetrically distributed guide blocks 744 are slidably connected to the outer side of the guide plates 743. A lifting plate 745 is fixedly connected, and a connecting plate 746 is fixedly connected between the left and right lifting plates 745. A sliding groove 747 is provided on the upper side of the connecting plate 746. A slider 748 is slidably connected to the inner side of the sliding groove 747. A control rod 749 is rotatably connected to the outer side of the slider 748. One end of the control rod 749 passes through the outer side of the slider 748 and is fixedly connected to a turntable 7416. Multiple stirring plates 7417 are fixedly connected to the outer side of the turntable 7416. A cutting blade 7418 is fixedly connected to the outer side of the multiple stirring plates 7417.

[0022] Lifting blocks 7424 are fixedly connected to the outer sides of the upper and lower lifting plates 745. The outer ends of the lifting blocks 7424 pass through the outer side of the pretreatment box 5 and are fixedly connected to the reciprocating plates 7425. A spring 7426 is fixedly connected between the reciprocating plates 7425 and the pretreatment box 5. A protective sleeve is fitted on the outer side of the spring 7426 to prevent impurities from getting tangled and affecting the extension and contraction of the spring 7426. A stop rod 7427 is fixedly connected to the outer side of the rear end of the upper and lower reciprocating plates 7425. A rotating rod 71 is rotatably connected to the inner side of the fixed cylinder 3. A lever is fixedly connected to the outer side of the rotating rod 71. The rear end of the movable plate 72 and the rotating rod 71 passes through the rear side of the fixed cylinder 3 and is fixedly connected to the control plate 7429. The outer side of the control plate 7429 is fixedly connected to the control block 7430. The outer side of the control block 7430 is rotatably connected to the control plate 7431. The outer side of the control plate 7431 is rotatably connected to the mounting plate 7432. The rear side of the fixed cylinder 3 is fixedly connected to the fixed cover 73. The mounting plate 7432 is slidably connected to the fixed cover 73. The outer side of the mounting plate 7432 is fixedly connected to the trapezoidal block 7428, which abuts against the abutment rod 7427.

[0023] When the fluid flows through the fixed cylinder 3, the fluid pushes the actuating plate 72 to rotate the rotating rod 71. The rotating rod 71 drives the control disk 7429 to rotate. The control disk 7429 drives the control plate 7431 to swing through the control block 7430, which in turn pushes the mounting plate 7432 to move left and right repeatedly. The mounting plate 7432 drives the trapezoidal block 7428 to move synchronously. Since the trapezoidal block 7428 has a wedge-shaped structure, it will squeeze the upper and lower abutment rods 7427 during its movement. With the elastic restoring action of the spring 7426, the abutment rod 7427 drives the reciprocating plate 7425 to move up and down repeatedly. The reciprocating plate 7425 drives the lifting plate 745 and the connecting plate 746 to move up and down repeatedly through the lifting block 7424. Finally, it drives the stirring plate 7417 to stir the fluid up and down, realizing the uniform mixing of multiple media. This process does not require an additional power source and can be completed by utilizing the kinetic energy of the fluid itself, which is energy-saving and environmentally friendly.

[0024] A movable block 7411 is fixedly connected to the front side of the slider 748. A rotating shaft 7412 is rotatably connected to the upper side of the movable block 7411. A large gear 7413 is fixedly connected to the outer side of the rotating shaft 7412. A small gear 7410 that meshes with the large gear 7413 is fixedly connected to the other end of the control lever 749. A fixed rod 7414 is fixedly connected to the upper side of the connecting plate 746. A toothed plate 7415 that meshes with the large gear 7413 is fixedly connected to the upper end of the fixed rod 7414. Sealing plates 7419 are fixedly connected to both the left and right sides of the slider 748. The sealing plates 7419 facilitate sealing of the slide groove 747 to prevent impurities from entering the large gear 7413 and the small gear 7410 and affecting rotation. An elastic sealing gasket is fixedly connected to the outer side of the sealing plate 7419. The elastic sealing gasket fits tightly against the inner wall of the slide groove 747 to prevent impurities from entering the transmission structure.

[0025] The slider 748 is fixedly connected to the base plate 7420 on both the front and rear sides. The outer side of the base plate 7420 is fixedly connected to the first rotating block 7421. The outer side of the first rotating block 7421 is rotatably connected to the inclined plate 7422. The right side of the connecting frame 741 is fixedly connected to the second rotating block 7423. The second rotating block 7423 and the inclined plate 7422 are rotatably connected.

[0026] The connecting plate 746 moves up and down repeatedly, driving the inclined plate 7422 to rotate. The inclined plate 7422 drives the slider 748 on the base plate 7420 to move left and right repeatedly. The slider 748 drives the moving block 7411 to move, and the moving block 7411 drives the large gear 7413 to move. Since the large gear 7413 is meshed with the toothed plate 7415, the large gear 7413 rotates, driving the small gear 7410 to rotate, which accelerates the rotation. The small gear 7410 drives the control rod 749 to rotate, which in turn drives the stirring plate 7417 to rotate, making the fluid more evenly mixed. The cutting blade 7418 on the outside of the stirring plate 7417 rotates synchronously, cutting large solid particles in the fluid into small particles. This not only prevents large impurities from wearing down the turbine blades, but also makes the solid particles and fluid mix more evenly, ensuring the accuracy of flow measurement.

[0027] Example 2 Based on Example 1, such as Figure 2 As shown, a backflush pipe 76 is fixedly connected between the liquid inlet pipe 2 and the feed pipe 6. A solenoid valve 710 is installed on the outside of the backflush pipe 76. A solenoid valve 77 is installed on the outside of the feed pipe 6 to the left of the backflush pipe 76. A drain pipe 78 is fixedly connected to the lower side of the feed pipe 6 and to the left of the solenoid valve 77. A solenoid valve 79 is installed on the outside of the drain pipe 78. A solenoid valve 75 is installed on the outside of the liquid inlet pipe 2 and to the left of the backflush pipe 76. Solenoid valves 75, 77, 79, and 710 are all electrically connected to an external controller to achieve automatic control.

[0028] The pretreatment box 5 is equipped with an observation window, and a protective frame is fixedly connected to the outside of the observation window. A pressure sensor is fixedly connected to the inside of the pretreatment box 5. The pressure sensor is electrically connected to an external controller to monitor the pressure difference across the filter screen 742. When too many impurities adhere to the surface of the filter screen 742, causing the pressure difference to reach a set threshold, the controller automatically closes solenoid valve 1 75 and solenoid valve 2 77 to stop the fluid from entering the flow meter body 1. At the same time, it opens solenoid valve 3 79 and solenoid valve 4 710. External clean water enters the backwash pipe 76 through the feed pipe 6, and then flows back into the pretreatment box 5 through the liquid inlet pipe 2, the fixed cylinder 3, and the connecting pipe 4 to backwash the filter screen 742. The impurities washed off are discharged through the drain pipe 78. After backwashing is completed, the controller closes solenoid valve 3 79 and solenoid valve 4 710 and opens solenoid valve 1 75 and solenoid valve 2 77. The invention resumes normal measurement without the need for shutdown and disassembly, ensuring continuous operation.

[0029] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0030] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A turbine flow meter, comprising a flow meter body (1), characterized in that, The flow meter body (1) is fixedly connected to the right side of the inlet pipe (2), the right end of the inlet pipe (2) is fixedly connected to the fixed cylinder (3), the right side of the fixed cylinder (3) is fixedly connected to the connecting pipe (4), the right end of the connecting pipe (4) is fixedly connected to the pretreatment box (5), the right side of the pretreatment box (5) is fixedly connected to the feed pipe (6), the inside of the pretreatment box (5) is provided with a processing unit (7), the processing unit (7) includes a mixing component (74), the mixing component (74) is used to make the fluid uniformly mixed.

2. A turbine flow meter according to claim 1, characterized in that, The mixing component (74) includes a connecting frame (741), which is fixedly connected to the inner side of the pretreatment box (5). A filter screen (742) is provided in the middle of the connecting frame (741). A guide plate (743) is fixedly connected to the right side of the connecting frame (741) and the inner right side wall of the pretreatment box (5). Two symmetrically distributed guide blocks (744) are slidably connected to the outer side of the guide plate (743). A lifting plate (745) is fixedly connected to the outer side of the guide block (744).

3. A turbine flow meter according to claim 2, characterized in that, A connecting plate (746) is fixedly connected between the lifting plates (745) on the left and right sides. A sliding groove (747) is provided on the upper side of the connecting plate (746). A slider (748) is slidably connected to the inner side of the sliding groove (747). A control rod (749) is rotatably connected to the outer side of the slider (748). One end of the control rod (749) passes through the outer side of the slider (748) and is fixedly connected to a turntable (7416). Multiple stirring plates (7417) are fixedly connected to the outer side of the turntable (7416). A cutting blade (7418) is fixedly connected to the outer side of the multiple stirring plates (7417).

4. A turbine flow meter according to claim 3, characterized in that, A movable block (7411) is fixedly connected to the front side of the slider (748). A rotating shaft (7412) is rotatably connected to the upper side of the movable block (7411). A large gear (7413) is fixedly connected to the outer side of the rotating shaft (7412). A small gear (7410) that meshes with the large gear (7413) is fixedly connected to the other end of the control lever (749). A fixed rod (7414) is fixedly connected to the upper side of the connecting plate (746). A toothed plate (7415) that meshes with the large gear (7413) is fixedly connected to the upper end of the fixed rod (7414). Sealing plates (7419) are fixedly connected to both the left and right sides of the slider (748).

5. A turbine flow meter according to claim 4, characterized in that, The slider (748) is fixedly connected to a base plate (7420) on both the front and rear sides. A rotating block (7421) is fixedly connected to the outer side of the base plate (7420). An inclined plate (7422) is rotatably connected to the outer side of the rotating block (7421). A rotating block (7423) is fixedly connected to the right side of the connecting frame (741). The rotating block (7423) and the inclined plate (7422) are rotatably connected.

6. A turbine flow meter according to claim 5, characterized in that, Lifting blocks (7424) are fixedly connected to the outer sides of the lifting plates (745) on both the upper and lower sides. The outer end of the lifting block (7424) passes through the outer side of the pretreatment box (5) and is fixedly connected to the reciprocating plate (7425). A spring (7426) is fixedly connected between the reciprocating plate (7425) and the pretreatment box (5).

7. A turbine flow meter according to claim 6, characterized in that, A stop rod (7427) is fixedly connected to the outer side of the rear end of the reciprocating plate (7425) on both the upper and lower sides. A rotating rod (71) is rotatably connected to the inner side of the fixed cylinder (3). A toggle plate (72) is fixedly connected to the outer side of the rotating rod (71). The rear end of the rotating rod (71) passes through the rear side of the fixed cylinder (3) and is fixedly connected to a control disk (7429). A control block (7430) is fixedly connected to the outer side of the control disk (7429). A control plate (7431) is rotatably connected to the outer side of the control block (7430). An installation plate (7432) is rotatably connected to the outer side of the control plate (7431). A fixed cover (73) is fixedly connected to the rear side of the fixed cylinder (3). The installation plate (7432) is slidably connected to the fixed cover (73). A trapezoidal block (7428) is fixedly connected to the outer side of the installation plate (7432). The trapezoidal block (7428) abuts against the stop rod (7427).

8. A turbine flow meter according to claim 7, characterized in that, A backflush pipe (76) is fixedly connected between the liquid inlet pipe (2) and the feed pipe (6). A solenoid valve four (710) is provided on the outside of the backflush pipe (76). A solenoid valve two (77) is provided on the outside of the feed pipe (6) to the left of the backflush pipe (76). A drain pipe (78) is fixedly connected to the lower side of the feed pipe (6) and to the left of the solenoid valve two (77). A solenoid valve three (79) is provided on the outside of the drain pipe (78). A solenoid valve one (75) is provided on the outside of the liquid inlet pipe (2) and to the left of the backflush pipe (76).

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