A throttling device for a water purifier

Abstract

This utility model relates to the field of throttling device technology, specifically a throttling device for a water purifier, including a throttling pipe. The inlet and outlet ends of the throttling pipe are respectively fixedly connected to an inlet pipe and a subsequent pipe via a first semi-circular sleeve and a second semi-circular sleeve, respectively, in cooperation with two sets of fixing components. An installation plate is fixedly connected to both ends of the throttling pipe. This utility model, through the combination of the first and second semi-circular sleeves and the fixing components, achieves rapid installation of the throttling pipe. Compared to the traditional method of connecting via multiple bolts and flanges, this connection structure requires no excessive tools and eliminates the need for repetitive and tedious bolt tightening operations, greatly simplifying the installation process, effectively saving installation time and labor costs, and significantly improving the convenience and efficiency of throttling pipe installation, making the entire water purifier assembly process faster and more efficient.

Description

Technical Field

[0001] This utility model relates to the field of throttling device technology, and in particular to a throttling device for a water purifier. Background Technology

[0002] Currently, in household or similar reverse osmosis and nanofiltration water purifiers, in order to ensure the pressure required for the reverse osmosis membrane or nanofiltration membrane to work, a wastewater proportioner or a flushing solenoid valve with a throttling function is installed on its concentrated water outlet pipe.

[0003] In the prior art, for example, Chinese Patent No. CN219409296U discloses a throttling device for a water purifier. This device includes a movable seat at the top of a throttling pipe, a slider that can move left and right inside the movable seat, a viewing window on the top of the movable seat along the slider's direction of movement, and a position marking line on the inner wall of the viewing window indicating the slider's position. The slider includes an indicator block at its top pointing to the position marking line, and a movable throttling block at its bottom. In this invention, when the position of the movable throttling block is adjusted, the indicator block moves accordingly. The current position of the indicator block can be viewed through the viewing window and the position marking line, allowing for a more accurate assessment of the gap between the movable and fixed throttling blocks. When the user needs to rotate the screw, they can use the anti-slip sleeve to rotate the drive rod, causing the connecting plate to rotate around the screw's axis. This ensures the screw can continuously rotate during operation, making the process simpler, more convenient, and saving time and effort.

[0004] In the aforementioned technology, the throttling pipe is connected to the corresponding pipe through flanges at both ends and bolts and nuts. This connection method requires multiple bolts, which means that during installation, tools are needed and repeated operations are required, which is time-consuming and labor-intensive, and does not improve the convenience and efficiency of throttling pipe installation. Utility Model Content

[0005] The purpose of this invention is to solve the problems mentioned in the background art and to propose a throttling device for a water purifier.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: a throttling device for a water purifier, comprising a throttling pipe, wherein the inlet and outlet ends of the throttling pipe are respectively fixedly connected to an inlet pipe and a subsequent pipe via a first semicircular sleeve and a second semicircular sleeve, respectively, in cooperation with two sets of fixing components; both ends of the throttling pipe are fixedly connected to a first mounting plate; and the ends of the inlet pipe and the subsequent pipe connected to the throttling pipe are each fixedly connected to a second mounting plate; the first and second mounting plates are engaged inside the first and second semicircular sleeves; the fixing components include a locking block and a locking seat; the locking block... The block is fixedly connected to both ends of the first semicircular sleeve, the card holder is fixedly connected to both ends of the second semicircular sleeve, two card plates are fixedly connected to the bottom of the card holder, the top of the card block has a slot, the card plate is inserted into the slot, the card plate has a card hole, the inside of the card block has a sliding groove, the inside of the sliding groove has a first insert block and a second insert block, a spring is fixedly connected between the first insert block and the second insert block, the first insert block and the second insert block are inserted into the corresponding card hole, and a first push plate and a second push plate are fixedly connected to the first insert block and the second insert block.

[0007] Preferably, a second anti-slip rib is fixedly connected to the top of the card holder, and a first anti-slip rib is fixedly connected to the bottom of the card block.

[0008] Preferably, the mounting plate one has a first chamfer at the position away from both ends of the throttling tube, and the mounting plate two has a second chamfer at the position away from both ends of the throttling tube.

[0009] Preferably, the throttling pipe is provided with an adjusting seat, and a one-way screw is rotatably connected to the inner part of the adjusting seat. One end of the one-way screw passes through the adjusting seat and is rotatably connected to the adjusting seat through a sealed bearing. A slider is threaded onto the one-way screw, and a movable throttling block is fixedly connected to the bottom end of the slider. A fixed throttling block is installed inside the throttling pipe on the right side below the movable throttling block. A gear is fixedly connected to one end of the one-way screw located outside the adjusting seat. A handle is rotatably connected to the throttling pipe, and one side of the handle meshes with the gear.

[0010] Preferably, the bottom end of the card plate is provided with a fourth chamfer, and the first insert block and the second insert block are provided with a third chamfer at the position of the fourth chamfer on the bottom end of the two card plates.

[0011] Preferably, a sealing ring is provided between the first mounting plate and the second mounting plate.

[0012] Preferably, the side of the mounting plate that contacts the sealing ring has several circular grooves, and the sealing ring is fixedly connected to corresponding rods at the positions of the several circular grooves, with the rods inserted into the inside of the circular grooves.

[0013] Preferably, the first semicircular sleeve and the second semicircular sleeve are provided with a first semicircular sealing sleeve and a second semicircular sealing sleeve inside, and the first semicircular sealing sleeve and the second semicircular sealing sleeve wrap around the outside of the first mounting plate and the second mounting plate.

[0014] Preferably, the inner wall of the slot has a slot corresponding to the position of the first and second insert blocks. A magnet is fixedly connected inside the slot, and the first and second insert blocks are magnetically connected to the magnet at one end after passing through the slot hole.

[0015] Preferably, positioning blocks are fixedly connected to the sides of both the first and second semicircular sleeves, and two positioning rods are fixedly connected to the throttling tube at the positions corresponding to the positioning blocks on the first and second semicircular sleeves, with the two positioning rods inserted inside the corresponding positioning blocks.

[0016] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0017] 1. In this utility model, the rapid installation of the throttling pipe is achieved through the cooperation of the first semi-circular sleeve, the second semi-circular sleeve, and the fixing component. When installation is required, the first and second semi-circular sleeves are clamped at both ends of the throttling pipe, so that the mounting plate and the mounting plate on the corresponding connecting pipe are clamped into the interior of the first and second semi-circular sleeves. Then, the clamping plate is aligned with the slot and inserted. The connection is completed by pushing the first and second inserts into the clamping holes by the spring force. When disassembling, the first and second push plates are pushed to separate the first and second inserts from the clamping holes. Compared with the traditional method of connecting by multiple bolts and flanges, this connection structure does not require many tools or repeated and tedious bolt tightening operations, which greatly simplifies the installation process, effectively saves installation time and labor costs, significantly improves the convenience and efficiency of throttling pipe installation, and makes the entire water purifier assembly process faster and more efficient.

[0018] 2. In this utility model, the positioning blocks on the first and second semicircular sleeves cooperate with the positioning rod on the throttling pipe for precise positioning. During installation, the positioning rod is inserted into the positioning block to ensure that the first and second semicircular sleeves accurately wrap around the installation plate, which facilitates improved installation accuracy and allows the card plate to be quickly inserted into the slot. At the same time, it can also prevent the first and second semicircular sleeves from rotating during operation, which is conducive to the stable operation of the throttling device and improves the stability and safety of the water purifier. Attached Figure Description

[0019] Figure 1 A schematic diagram of a throttling device for a water purifier is provided for this utility model;

[0020] Figure 2 An exploded view of a throttling device for a water purifier is provided for this utility model;

[0021] Figure 3 This invention provides a partially exploded view of a throttling device for a water purifier.

[0022] Figure 4 This invention proposes a throttling device for a water purifier. Figure 3 Enlarged view of point A in the middle;

[0023] Figure 5 An exploded view of a throttling device block for a water purifier is provided for this utility model.

[0024] Figure 6 A bottom view of a throttling device block for a water purifier is provided for this utility model;

[0025] Figure 7 This utility model provides a cross-sectional view of a throttling device block for a water purifier.

[0026] Legend:

[0027] 1. Throttling pipe; 2. Inlet pipe; 3. Subsequent pipe; 4. Mounting plate one; 5. Mounting plate two; 6. First semi-circular sleeve; 7. Second semi-circular sleeve; 8. Fixing assembly; 801. Clip; 802. Clip seat; 803. Clip plate; 804. Clip hole; 805. Slide groove; 806. Slot; 807. First insert block; 808. Spring; 809. Second insert block; 810. First push plate; 811. Second push plate; 9. Sealing ring; 10. Circular groove; 11. Insert rod ; 12. Positioning rod; 13. Positioning block; 14. First chamfer; 15. Second chamfer; 16. First semi-circular sealing sleeve; 17. Second semi-circular sealing sleeve; 18. Second anti-slip rib; 19. Slot; 20. Magnet; 21. First anti-slip rib; 22. Adjusting seat; 23. Slider; 24. Movable throttling block; 25. Fixed throttling block; 26. Rotary handle; 27. Gear; 28. One-way lead screw; 29. ​​Sealed bearing; 30. Third chamfer; 31. Fourth chamfer. Detailed Implementation

[0028] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0029] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0030] Example 1: As Figure 1 - Figure 7 As shown, this utility model provides a technical solution: a throttling device for a water purifier, including a throttling pipe 1. The inlet and outlet ends of the throttling pipe are respectively fixedly connected to an inlet pipe 2 and a subsequent pipe 3 via a first semicircular sleeve 6 and a second semicircular sleeve 7, and two sets of fixing components 8. Mounting disc 1 4 is fixedly connected to both ends of the throttling pipe. Mounting disc 2 5 is fixedly connected to the end of the inlet pipe 2 and the subsequent pipe 3 that connects to the throttling pipe 1. Mounting disc 1 4 and mounting disc 2 5 are fitted inside the first semicircular sleeve 6 and the second semicircular sleeve 7. The fixing components 8 include a locking block 801 and a locking seat 802. The locking block 801 is fixedly connected to both ends of the first semicircular sleeve 6, and the locking seat 802 is fixedly connected to both ends of the second semicircular sleeve 7. The bottom of the locking seat 802... The component is fixedly connected to two locking plates 803. A slot 806 is provided on the top of the locking block 801, and the locking plate 803 is inserted into the slot 806. A locking hole 804 is provided on the locking plate 803. A sliding groove 805 is provided inside the locking block 801, and a first insert 807 and a second insert 809 are slidably connected inside the sliding groove 805. A spring 808 is fixedly connected between the first insert 807 and the second insert 809. The first insert 807 and the second insert 809 are inserted into the corresponding locking holes 804. A first push plate 810 and a second push plate 811 are fixedly connected to the first insert 807 and the second insert 809. A second anti-slip rib 18 is fixedly connected to the top of the locking base 802, and a first anti-slip rib 18 is fixedly connected to the bottom of the locking block 801. The mounting plate 4 has a first chamfer 14 at the position away from both ends of the throttling pipe, and a second chamfer 15 at the edge of the mounting plate 5 at the position away from both ends of the throttling pipe. An adjusting seat 22 is installed on the throttling pipe 1. A one-way screw 28 is rotatably connected to the inner part of the adjusting seat 22, and one end of the one-way screw 28, passing through the adjusting seat 22, is rotatably connected to the adjusting seat 22 via a sealed bearing 29. A slider 23 is threaded onto the one-way screw 28, and a movable throttling block 24 is fixedly connected to the bottom end of the slider 23. A fixed throttling block 25 is installed inside the throttling pipe 1 on the right side below the movable throttling block 24. A gear 27 is fixedly connected to the end of the one-way screw 28 located outside the adjusting seat 22. A handle 26 is rotatably connected to the throttling pipe 1. One side of the handle 26 meshes with the gear 27. The bottom end of the clamping plate 803 is provided with a fourth chamfer 31. The first insert 807 and the second insert 809 are provided with a third chamfer 30 corresponding to the fourth chamfer 31 on the bottom end of the two clamping plates 803. A sealing ring 9 is provided between the first mounting plate 4 and the second mounting plate 5. Several circular grooves 10 are provided on the side of the mounting plate that contacts the sealing ring 9. Corresponding insert rods 11 are fixedly connected to the sealing ring 9 at the positions of the several circular grooves 10. The insert rods 11 are inserted into the inside of the circular grooves 10. The first semicircular sleeve 6 and the second semicircular sleeve 7 are provided with a first semicircular sealing sleeve 16 and a second semicircular sealing sleeve 17. The first semicircular sealing sleeve 16 and the second semicircular sealing sleeve 17 are wrapped around the outside of the first mounting plate 4 and the second mounting plate 5.

[0031] The beneficial effects achieved in this embodiment 1 are as follows: By setting the first semicircular sleeve 6 and the second semicircular sleeve 7 and the fixing component 8 together, the throttling pipe 1 is quickly installed, greatly simplifying the installation process. It eliminates the need for excessive tools and repetitive, tedious bolt tightening operations, effectively saving installation time and labor costs, improving the convenience and efficiency of the throttling pipe 1 installation, and making the entire water purifier assembly process faster and more efficient. The second anti-slip rib 18 on the top of the card holder 802 and the first anti-slip rib 21 on the bottom of the card block 801 increase the friction when the card holder 802 and card block 801 are pressed to insert the card plate 803 into the slot 806, preventing unnecessary slippage and ensuring installation stability. The first chamfer 14 of the installation disc 1 and the second chamfer 15 of the installation disc 2 facilitate better interlocking of the two into the corresponding semicircular sleeves during installation, making the installation process smoother. The system features a throttling mechanism. A regulating seat 22, a one-way screw 28, a slider 23, a movable throttling block 24, a fixed throttling block 25, and related components are installed on the throttling pipe 1. Rotating the handle 26 drives the one-way screw 28 via the gear 27, which in turn causes the slider 23 to move the movable throttling block 24, achieving precise adjustment of the throttling degree to meet the water flow throttling requirements under different operating conditions. A sealing ring 9 is installed between the first mounting plate 4 and the second mounting plate 5, and the cooperation between the circular groove 10 and the insertion rod 11 enhances the sealing effect between them, while preventing the sealing ring 9 from rotating and preventing water leakage at the connection point, ensuring the normal operation of the water purifier. The first semi-circular sealing sleeve 16 and the second semi-circular sealing sleeve 17 installed inside the first semi-circular sleeve 6 and the second semi-circular sleeve 7 further improve the sealing of the entire connection, ensuring that the water flows along a predetermined route within the pipe and preventing leakage from affecting the working performance of the water purifier.

[0032] Example 2: As Figure 2 - Figure 5 As shown, the inner wall of the slot 806 has a slot 19 corresponding to the position of the first insert 807 and the second insert 809. A magnet 20 is fixedly connected inside the slot 19. The first insert 807 and the second insert 809 pass through the slot hole 804 and are inserted into the slot 19 and magnetically connected to the magnet 20. Positioning blocks 13 are fixedly connected to the sides of the first semicircular sleeve 6 and the second semicircular sleeve 7. Two positioning rods 12 are fixedly connected to the throttling tube corresponding to the positions of the positioning blocks 13 on the first semicircular sleeve 6 and the second semicircular sleeve 7. The two positioning rods 12 are inserted into the interior of the corresponding positioning blocks 13.

[0033] The beneficial effects achieved in this embodiment 2 are as follows: By setting a magnet 20 in the slot 19, the first insert 807 and the second insert 809 pass through the slot 804 and are inserted into the slot 19 at one end, and are magnetically connected to the magnet 20, which further strengthens the connection stability of the fixing component 8 and prevents the slot 801 from accidentally separating from the slot 802 due to factors such as water flow impact during use, thus ensuring the firmness and reliability of the throttling device connection structure; the positioning blocks 13 on the first semicircular sleeve 6 and the second semicircular sleeve 7 cooperate with the positioning rod 12 on the throttling pipe 1 for precise positioning. During installation, the positioning rod 12 is inserted into the positioning block 13 to ensure that the first semicircular sleeve 6 and the second semicircular sleeve 7 accurately wrap the installation plate, which facilitates the improvement of installation accuracy and allows the card plate 803 to be quickly inserted into the slot 806. At the same time, it can also prevent the first semicircular sleeve 6 and the second semicircular sleeve 7 from rotating during operation, which is conducive to the stable operation of the throttling device and improves the stability and safety of the water purifier operation.

[0034] The working principle of this embodiment is as follows: During installation, the insert rod 11 on the sealing ring 9 is first inserted into the circular groove 10 on the mounting plate 4. Then, the inlet and outlet ends of the throttling pipe are connected to the inlet pipe 2 and the subsequent pipe 3 via the first semicircular sleeve 6 and the second semicircular sleeve 7, respectively. The mounting plate 4 and the mounting plate 5 are then secured inside the first semicircular sleeve 6 and the second semicircular sleeve 7. During this process, the first chamfer 14 on the mounting plate 4 away from both ends of the throttling pipe and the second chamfer 15 on the edge of the mounting plate 5 away from both ends of the throttling pipe serve as guides, facilitating smoother insertion of the mounting plate 4 and the mounting plate 5 into their respective semicircular sleeves, reducing installation obstacles and improving installation efficiency. Finally, the mounting plate is secured by the fixing components. 8. To fix the card, specifically, align the card plate 803 at the bottom of the card holder 802 with the slot 806 at the top of the card block 801 and insert it. Then, press the card holder 802 and the card block 801 simultaneously with both hands. The fourth chamfer 31 at the bottom of the card plate 803 presses against the third chamfer 30 on the first insert 807 and the second insert 809, causing the first insert 807 and the second insert 809 to retract into the slide groove 805. Then, when the card hole 804 on the card plate 803 is aligned with the first insert 807 and the second insert 809, the spring 808 pushes the first insert 807 and the second insert 809 into the card hole 804 on the card plate 803. At the same time, the first insert 807 and the second insert 809 pass through the card hole 804 and are inserted into the card slot 19, where they are magnetically attracted to the magnet 20. After connecting and fixing, during installation, the positioning rod 12 is inserted into the positioning block 13 to ensure precise positioning of each component and to ensure that the first semicircular sleeve 6 and the second semicircular sleeve 7 accurately wrap around the installation plate. Regarding throttling adjustment, when the degree of throttling needs to be adjusted, the handle 26 on the throttling pipe 1 is rotated. The handle 26 drives the gear 27 meshing with it to rotate, and the gear 27 drives the one-way screw 28 to rotate. Since the one-way screw 28 and the slider 23 are threadedly connected, and the one-way screw 28 is rotatably connected to the adjusting seat 22 through the sealed bearing 29, the rotation of the one-way screw 28 will cause the slider 23 to move along its axial direction. The movable throttling block 24 fixed at the bottom of the slider 23 will move accordingly. By changing the gap between the movable throttling block 24 and the fixed throttling block 25, the throttling effect can be achieved. The system precisely regulates the flow rate of water passing through the throttling pipe 1 to meet the water purifier's throttling requirements under different operating conditions. Throughout operation, sealing components such as the sealing ring 9, the first semi-circular sealing sleeve 16, and the second semi-circular sealing sleeve 17 ensure the sealing of the connections, preventing leakage and allowing the water to flow stably along the set path within the device and related pipes of the water purifier. This ensures the stable and efficient operation of the water purifier. If the throttling pipe 1 needs to be disassembled later, simply press the first push plate 810 and the second push plate 811 to retract the first insert 807 and the second insert 809 into the sliding groove 805 inside the locking block 801. The first insert 807 and the second insert 809 then disengage from their corresponding slots 19 and holes 804.Then, separate the first semicircle sleeve 6 and the second semicircle sleeve 7.

[0035] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A throttling device for a water purifier, comprising a throttling pipe (1), characterized in that: The inlet and outlet ends of the throttling pipe are respectively fixedly connected to the inlet pipe (2) and the subsequent pipe (3) through the first semicircular sleeve (6) and the second semicircular sleeve (7) and two sets of fixing components (8). The two ends of the throttling pipe are fixedly connected to the first mounting plate (4). The end of the inlet pipe (2) and the subsequent pipe (3) connected to the throttling pipe (1) is fixedly connected to the second mounting plate (5). The first mounting plate (4) and the second mounting plate (5) are locked inside the first semicircular sleeve (6) and the second semicircular sleeve (7). The fixing component (8) includes a locking block (801) and a locking seat (802). The locking block (801) is fixedly connected to the two ends of the first semicircular sleeve (6). The locking seat (802) is fixedly connected to the two ends of the second semicircular sleeve (7). The bottom of the locking seat (802) Two locking plates (803) are fixedly connected to the part. The top of the locking block (801) is provided with a slot (806). The locking plate (803) is inserted into the slot (806). The locking plate (803) is provided with a locking hole (804). The inside of the locking block (801) is provided with a sliding groove (805). The inside of the sliding groove (805) is slidably connected to a first insert (807) and a second insert (809). A spring (808) is fixedly connected between the first insert (807) and the second insert (809). The first insert (807) and the second insert (809) are inserted into the corresponding locking holes (804). A first push plate (810) and a second push plate (811) are fixedly connected to the first insert (807) and the second insert (809).

2. The throttling device for a water purifier according to claim 1, characterized in that: The top of the card holder (802) is fixedly connected to a second anti-slip rib (18), and the bottom of the card block (801) is fixedly connected to a first anti-slip rib (21).

3. The throttling device for a water purifier according to claim 1, characterized in that: The mounting plate one (4) has a first chamfer (14) at the position away from both ends of the throttling tube, and the mounting plate two (5) has a second chamfer (15) at the position away from both ends of the throttling tube.

4. The throttling device for a water purifier according to claim 1, characterized in that: An adjusting seat (22) is provided on the throttling pipe (1). A one-way screw (28) is rotatably connected to the inner part of the adjusting seat (22). One end of the one-way screw (28) passes through the adjusting seat (22) and is rotatably connected to the adjusting seat (22) through a sealed bearing (29). A slider (23) is threadedly connected to the one-way screw (28). A movable throttling block (24) is fixedly connected to the bottom end of the slider (23). A fixed throttling block (25) is installed inside the throttling pipe (1) on the right side below the movable throttling block (24). A gear (27) is fixedly connected to one end of the one-way screw (28) located outside the adjusting seat (22). A rotating handle (26) is rotatably connected to the throttling pipe (1), and one side of the rotating handle (26) meshes with the gear (27).

5. The throttling device for a water purifier according to claim 1, characterized in that: The bottom end of the card plate (803) is provided with a fourth chamfer (31), and the first insert block (807) and the second insert block (809) are provided with a third chamfer (30) at the position of the fourth chamfer (31) on the bottom end of the two card plates (803).

6. The throttling device for a water purifier according to claim 1, characterized in that: A sealing ring (9) is provided between the first mounting plate (4) and the second mounting plate (5).

7. The throttling device for a water purifier according to claim 6, characterized in that: The mounting plate has several circular grooves (10) on the side that contacts the sealing ring (9). The sealing ring (9) is fixedly connected with corresponding insert rods (11) at the positions of the several circular grooves (10). The insert rods (11) are inserted into the inside of the circular grooves (10).

8. The throttling device for a water purifier according to claim 1, characterized in that: The first semicircular sleeve (6) and the second semicircular sleeve (7) are provided with a first semicircular sealing sleeve (16) and a second semicircular sealing sleeve (17), and the first semicircular sealing sleeve (16) and the second semicircular sealing sleeve (17) are wrapped around the outside of the first mounting plate (4) and the second mounting plate (5).

9. The throttling device for a water purifier according to claim 1, characterized in that: The inner wall of the slot (806) is provided with a slot (19) corresponding to the position of the first insert (807) and the second insert (809). A magnet (20) is fixedly connected inside the slot (19). The first insert (807) and the second insert (809) pass through the slot hole (804) and are inserted into the slot (19) and magnetically connected to the magnet (20).

10. The throttling device for a water purifier according to claim 1, characterized in that: The first semicircular sleeve (6) and the second semicircular sleeve (7) are both fixedly connected to the side of a positioning block (13). Two positioning rods (12) are fixedly connected to the throttling tube at the positions of the positioning blocks (13) on the first semicircular sleeve (6) and the second semicircular sleeve (7). The two positioning rods (12) are inserted into the corresponding positioning blocks (13).

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