Venturi valve capable of accurately detecting airflow velocity

Abstract

The utility model relates to the technical field of venturi valves, in particular to a venturi valve capable of accurately detecting airflow velocity, which comprises a valve body and a valve cone arranged in the valve body, the valve body is provided with an opening and closing channel, the valve cone is used for controlling the opening and closing of the opening and closing channel, and the inner wall of the valve body is provided with a first mounting seat and a second mounting seat. The valve cone is located between the first installation base and the second installation base, the first installation base is provided with a first pressure sensor, and the second installation base is provided with a second pressure sensor. The venturi valve has the effect of improving the detection precision of the air flow velocity of the venturi valve.

Description

Technical Field

[0001] This application relates to the field of venturi valve technology, and in particular to a venturi valve capable of accurately detecting airflow velocity. Background Technology

[0002] A Venturi valve is a valve manufactured based on the Venturi effect, specifically a Venturi airflow control valve, which can extend airflow control to the highest level. Through aerodynamic design, Venturi valves offer quiet operation and are typically used in fume hood dust collection and indoor pressure control systems to provide reliable control.

[0003] Currently, in order to detect the flow rate (flow rate) of the airflow inside a Venturi valve, a flow sensor or a pressure sensor is usually installed. When a pressure sensor is used for detection, the pressure sensor is usually installed on the inner wall of the valve body. The flow rate inside the Venturi valve is calculated by detecting the change in pressure inside the valve body through the pressure sensor, and the flow rate is calculated by combining the airflow conduction area inside the valve body.

[0004] However, in practice, the inventors found that the detection results obtained by using a single pressure sensor usually contain errors and there is room for improvement. Utility Model Content

[0005] To improve the detection accuracy of airflow velocity in a venturi valve, this application provides a venturi valve capable of accurately detecting airflow velocity.

[0006] The Venturi valve provided in this application, which can accurately detect airflow velocity, adopts the following technical solution:

[0007] A venturi valve capable of accurately detecting airflow velocity includes a valve body and a valve cone disposed within the valve body. The valve body has an opening and closing channel, and the valve cone is used to control the opening and closing of the opening and closing channel. The inner wall of the valve body is provided with a first mounting seat and a second mounting seat, and the valve cone is located between the first mounting seat and the second mounting seat. The first mounting seat is provided with a first pressure sensor, and the second mounting seat is provided with a second pressure sensor.

[0008] By adopting the above technical solution, by setting a first mounting base and a second mounting base, the first pressure sensor and the second pressure sensor are respectively provided as mounting carriers, which facilitates the installation of the first pressure sensor and the second pressure sensor inside the valve body. The valve cone is located between the first mounting base and the second mounting base. When the Venturi valve is working, the first pressure sensor and the second pressure sensor simultaneously detect the airflow located on both sides of the valve cone, which improves the detection accuracy of the airflow velocity of the Venturi valve. If one of the pressure sensors is damaged later, it is easy for the staff to find and deal with it in time.

[0009] Preferably, the valve body includes a waist-shaped tube and a pair of straight tubes respectively disposed at both ends of the waist-shaped tube. The inner diameter of the middle part of the waist-shaped tube is smaller than the inner diameter of the end part of the waist-shaped tube, so that the middle part of the waist-shaped tube forms an opening and closing channel. The first mounting seat is fixedly connected to the inner wall of the waist-shaped tube, and the second mounting seat is slidably connected to the inner wall of the straight tube along the axial direction. The valve body is provided with an adjustment component for adjusting the sliding position of the second mounting seat.

[0010] By adopting the above technical solution, the first pressure sensor is built into the waist-shaped tube to detect the airflow passing through the waist-shaped tube. The second mounting base is slidably connected to the inner wall of the straight tube along the axial direction of the straight tube. The sliding position of the second mounting base is adjusted by adjusting the adjustment component, thereby adjusting the detection position of the second sensor in the straight tube, so that the second sensor is located in a suitable detection position to improve the detection accuracy.

[0011] Preferably, a guide rail is fixedly connected to the inner wall of the straight tube, the length direction of the guide rail is parallel to the axial direction of the straight tube, and the second mounting base has a guide groove that is slidably connected to the guide rail.

[0012] By adopting the above technical solution, the sliding assembly of the second mounting base and the straight tube is achieved by setting it on the guide rail and guide groove.

[0013] Preferably, both ends of the guide rail are detachably connected to blocking blocks to prevent the second mounting base from sliding off the guide rail.

[0014] By adopting the above technical solution, blocking blocks are added to both ends of the guide rail to prevent the second mounting base from sliding off the guide rail.

[0015] Preferably, the adjustment assembly includes a first magnet block disposed on the second mounting base and a second magnet block located outside the straight tube and slidably connected to the straight tube along the outside of the straight tube. The first magnet block and the second magnet block attract each other, and the second magnet block abuts against the outer peripheral wall of the straight tube.

[0016] By adopting the above technical solution, by applying a force to the second magnet, the second magnet slides outside the straight tube. At the same time, the attraction provided by the second magnet causes the first magnet located inside the straight tube to slide together, thereby causing the second mounting base to slide, thus realizing the position adjustment of the second pressure sensor. The attraction force of the first magnet always presses against the outer peripheral wall of the straight tube. When the external force applied to the second magnet is removed, the second magnet fixes the position of the second mounting base.

[0017] Preferably, the second magnet block is provided with a resistance-increasing pad that abuts against the outer peripheral wall of the straight tube.

[0018] By adopting the above technical solution, a friction-increasing pad is added to increase the friction between the second magnet and the straight tube, thereby increasing the sliding damping of the second magnet and the straight tube and reducing the possibility of the second magnet sliding relative to the straight tube without external force.

[0019] Preferably, the adjustment assembly further includes a driving component for driving the second magnet block to slide. The driving component includes a fixed plate fixedly connected to the outer peripheral wall of the straight tube, a guide rod fixedly connected to the fixed plate, a slider slidably sleeved on the guide rod, and a screw rotatably connected to the fixed plate and threaded through the slider. The second magnet block is fixedly connected to the slider.

[0020] By adopting the above technical solution, the slider slides along the axial direction of the screw due to the thread restriction of the screw when the screw is rotated, thereby realizing the sliding adjustment of the second magnet block.

[0021] Preferably, the drive component further includes a knob fixedly connected to the end of the screw.

[0022] By adopting the above technical solution and adding a knob, it is easier to rotate the screw.

[0023] In summary, this utility model has the following beneficial effects:

[0024] 1. By setting a first mounting base and a second mounting base, the first pressure sensor and the second pressure sensor are respectively provided as mounting carriers, which facilitates the installation of the first pressure sensor and the second pressure sensor inside the valve body. The valve cone is located between the first mounting base and the second mounting base. When the Venturi valve is working, the first pressure sensor and the second pressure sensor simultaneously detect the airflow on both sides of the valve cone, thereby improving the detection accuracy of the airflow velocity of the Venturi valve.

[0025] 2. The first pressure sensor is built into the waist-shaped tube to detect the airflow passing through the waist-shaped tube. The second mounting base is slidably connected to the inner wall of the straight tube along the axial direction of the straight tube. The sliding position of the second mounting base is adjusted by adjusting the adjustment component, thereby adjusting the detection position of the second sensor in the straight tube, so that the second sensor is in a suitable detection position to improve the detection accuracy.

[0026] 3. By applying force to the second magnet, the second magnet slides outside the straight tube. At the same time, the attraction provided by the second magnet causes the first magnet located inside the straight tube to slide together, thereby causing the second mounting base to slide, thus realizing the position adjustment of the second pressure sensor. The second magnet is always pressed against the outer peripheral wall of the straight tube by the attraction of the first magnet. When the external force applied to the second magnet is removed, the second magnet fixes the position of the second mounting base. Attached Figure Description

[0027] Figure 1This is a schematic diagram of the overall structure of a Venturi valve capable of accurately detecting airflow velocity in Example 1;

[0028] Figure 2 This is a schematic diagram of the internal structure of the valve body in Example 1;

[0029] Figure 3 This is a schematic diagram of the adjustment component in Example 1;

[0030] Figure 4 This is a schematic diagram of the adjustment component in Embodiment 2;

[0031] Figure 5 This is a schematic diagram of the internal structure of the valve body in Example 2.

[0032] In the diagram, 1. Valve body; 11. Waist-shaped tube; 12. Straight tube; 13. Support frame; 14. Valve stem; 15. Second sealing ring; 16. Guide rail; 161. Blocking block; 2. Valve cone; 21. First sealing ring; 3. First mounting base; 31. First pressure sensor; 4. Second mounting base; 41. Second pressure sensor; 5. Adjustment component; 51. First magnet block; 52. Second magnet block; 521. Resistance pad block; 53. Drive component; 531. Fixing plate; 532. Guide rod; 533. Slider; 534. Screw; 535. Knob. Detailed Implementation

[0033] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0034] Example 1:

[0035] This application discloses a Venturi valve capable of accurately detecting airflow velocity, with reference to... Figure 1 , Figure 2 The valve body 1 includes a valve body 1 and a valve cone 2 disposed in the inner cavity of the valve body 1. The valve body 1 includes a waist-shaped tube 11 and a pair of straight tubes 12 that are coaxially fixed to both ends of the waist-shaped tube 11. The inner diameter of the middle part of the waist-shaped tube 11 is smaller than the inner diameter of the end part of the waist-shaped tube 11, so that the middle part of the waist-shaped tube 11 forms an opening and closing channel. The inner peripheral wall of the end part of the waist-shaped tube 11 and the inner peripheral wall of the straight tube 12 are smoothly connected. The valve cone 2 is used to control the opening and closing of the opening and closing channel.

[0036] A support frame 13 is fixedly connected to the inner circumferential wall of the straight pipe 12. The support frame 13 has a hollow structure, and a valve stem 14 is fixedly connected to the middle of the support frame 13. The valve stem 14 and the valve body 1 are coaxially arranged, and the valve cone 2 is slidably sleeved on the valve stem 14. The straight pipe 12 is provided with a control mechanism (not shown in the figure) to control the sliding of the valve cone 2 to control the opening and closing of the opening and closing channel. The control mechanism is existing technology and will not be described in detail here. A first sealing ring 21 is coaxially fixedly connected to the outer circumferential wall of the valve cone 2 at the maximum outer diameter, and a second sealing ring 15 is coaxially fixedly connected to the inner circumferential wall of the waist-shaped pipe 11 at the opening and closing channel. When the valve cone 2 slides to the position where the first sealing ring 21 abuts against the second sealing ring 15, the opening and closing channel is closed.

[0037] A first mounting base 3 is fixedly connected to the inner wall of the waist-shaped tube 11. The first mounting base 3 is located below the valve cone 2 and the second sealing ring 15. The first mounting base 3 can be fixed by adhesive or welding. In this embodiment, the first mounting base 3 is a block, and it is fixed to the inner wall of the waist-shaped tube 11 by welding. A first pressure sensor 31 is mounted on the first mounting base 3. Specifically, the first pressure sensor 31 is a pneumatic pressure sensor. The first pressure sensor 31 can be fixed by screw locking or snap-fit. In this embodiment, the first pressure sensor 31 is fixedly connected to the first mounting base 3 by screws.

[0038] Reference Figure 2 , Figure 3 A second mounting base 4 is provided on the inner wall of the straight pipe 12, located above the valve cone 2. The second mounting base 4 is a block, and a second pressure sensor 41 is mounted on it. Specifically, the second pressure sensor 41 is a pneumatic pressure sensor. The second pressure sensor 41 can be fixed by screw locking or snap-fit. In this embodiment, the second pressure sensor 41 is fixedly connected to the second mounting base 4 by screws. The second mounting base 4 is slidably connected to the inner wall of the straight pipe 12 along its axial direction. Specifically, a guide rail 16 is fixedly connected to the inner wall of the straight pipe 12. The length direction of the guide rail 16 is parallel to the axial direction of the straight pipe 12, and the second mounting base 4 has a guide groove that is slidably connected to the guide rail 16. Both ends of the guide rail 16 are detachably connected by screws to a blocking block 161 to prevent the second mounting base 4 from sliding out of the guide rail 16.

[0039] The valve body 1 is provided with an adjustment assembly 5 for adjusting the sliding position of the second mounting base 4. The adjustment assembly 5 includes a first magnet block 51 fixedly connected to the second mounting base 4 and a second magnet block 52 located outside the straight pipe 12 and slidably connected to the outer wall of the straight pipe 12. The first magnet block 51 and the second magnet block 52 attract each other, causing the second magnet block 52 to abut against the outer peripheral wall of the straight pipe 12. The second magnet block 52 is provided with a resistance-increasing pad 521 that abuts against the outer peripheral wall of the straight pipe 12. The resistance-increasing pad 521 is a rubber block.

[0040] The implementation principle of a Venturi valve that can accurately detect airflow velocity in this application embodiment is as follows: when the Venturi valve is working, the first pressure sensor 31 and the second pressure sensor 41 simultaneously detect the airflow located on both sides of the valve cone 2, thereby improving the detection accuracy of the airflow velocity of the Venturi valve.

[0041] The second mounting base 4 is slidably connected to the inner wall of the straight tube 12 along the axial direction of the straight tube 12. By applying a force to the second magnet 52, the second magnet 52 slides outside the straight tube 12. At the same time, the attraction provided by the second magnet 52 drives the first magnet 51 located inside the straight tube 12 to slide together, thereby driving the second mounting base 4 to slide, thereby realizing the position adjustment of the second pressure sensor 41. The attraction force of the first magnet 51 always presses the second magnet 52 against the outer peripheral wall of the straight tube 12. When the external force applied to the second magnet 52 is removed, the second magnet 52 fixes the position of the second mounting base 4.

[0042] Example 2:

[0043] The difference from Example 1 is that, referring to Figure 4 The adjustment assembly 5 also includes a driving component 53 for driving the second magnet block 52 to slide. The driving component 53 includes a fixed plate 531 fixedly connected to the outer peripheral wall of the straight tube 12, a guide rod 532 fixedly connected to the fixed plate 531, a slider 533 slidably sleeved on the guide rod 532, a screw 534 rotatably connected to the fixed plate 531 and threaded through the slider 533, and a knob 535 fixedly connected to the end of the screw 534. The axial direction of the guide rod 532 is parallel to the axial direction of the straight tube 12, the axial direction of the screw 534 is parallel to the axial direction of the guide rod 532, and the second magnet block 52 is fixedly connected to the slider 533.

[0044] By rotating the knob 535, the screw 534 is rotated, causing the slider 533 to slide along the axial direction of the screw 534, which in turn causes the second magnet block 52 to slide. At the same time, the attraction provided by the second magnet block 52 causes the first magnet block 51 located inside the straight tube 12 to slide together, thereby causing the second mounting base 4 to slide, thus realizing the position adjustment of the second pressure sensor 41, so that the second sensor is located in a suitable detection position to improve detection accuracy.

[0045] Example 3:

[0046] The difference from Example 1 is that, referring to Figure 5Both the first mounting base 3 and the second mounting base 4 are annular structures, and are coaxially arranged with the valve body 1. Multiple first pressure sensors 31 are provided and spaced apart around the axis of the first mounting base 3, and multiple second pressure sensors 41 are provided and spaced apart around the axis of the second mounting base 4. The multiple first pressure sensors 31 and second pressure sensors 41 synchronously detect different positions within the valve body 1.

[0047] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A Venturi valve capable of accurately detecting airflow velocity, characterized in that: The valve includes a valve body (1) and a valve cone (2) disposed within the valve body (1). The valve body (1) has an opening and closing channel, and the valve cone (2) is used to control the opening and closing of the opening and closing channel. The inner wall of the valve body (1) is provided with a first mounting seat (3) and a second mounting seat (4). The valve cone (2) is located between the first mounting seat (3) and the second mounting seat (4). The first mounting seat (3) is provided with a first pressure sensor (31), and the second mounting seat (4) is provided with a second pressure sensor (41).

2. The Venturi valve for accurately detecting airflow velocity according to claim 1, characterized in that: The valve body (1) includes a waist-shaped tube (11) and a pair of straight tubes (12) respectively disposed at both ends of the waist-shaped tube (11). The inner diameter of the middle part of the waist-shaped tube (11) is smaller than the inner diameter of the end of the waist-shaped tube (11), so that the middle part of the waist-shaped tube (11) forms an opening and closing channel. The first mounting seat (3) is fixedly connected to the inner wall of the waist-shaped tube (11), and the second mounting seat (4) is slidably connected to the inner wall of the straight tube (12) along the axial direction. The valve body (1) is provided with an adjusting component (5) for adjusting the sliding position of the second mounting seat (4).

3. A Venturi valve for accurately detecting airflow velocity according to claim 2, characterized in that: The inner wall of the straight tube (12) is fixedly connected to a guide rail (16), the length direction of the guide rail (16) is parallel to the axial direction of the straight tube (12), and the second mounting base (4) has a guide groove that is slidably connected to the guide rail (16).

4. A Venturi valve for accurately detecting airflow velocity according to claim 3, characterized in that: Both ends of the guide rail (16) are detachably connected to a blocking block (161) to prevent the second mounting base (4) from sliding out of the guide rail (16).

5. A Venturi valve for accurately detecting airflow velocity according to claim 3, characterized in that: The adjustment assembly (5) includes a first magnet block (51) disposed on the second mounting base (4) and a second magnet block (52) located outside the straight tube (12) and slidably connected to the straight tube (12) along the outside of the straight tube (12). The first magnet block (51) and the second magnet block (52) attract each other, and the second magnet block (52) abuts against the outer peripheral wall of the straight tube (12).

6. A Venturi valve for accurately detecting airflow velocity according to claim 5, characterized in that: The second magnet block (52) is provided with a resistance pad (521) that abuts against the outer peripheral wall of the straight tube (12).

7. A Venturi valve for accurately detecting airflow velocity according to claim 5, characterized in that: The adjustment assembly (5) further includes a driving component (53) for driving the second magnet block (52) to slide. The driving component (53) includes a fixed plate (531) fixedly connected to the outer peripheral wall of the straight tube (12), a guide rod (532) fixedly connected to the fixed plate (531), a slider (533) slidably sleeved on the guide rod (532), and a screw (534) rotatably connected to the fixed plate (531) and threaded through the slider (533). The second magnet block (52) is fixedly connected to the slider (533).

8. A Venturi valve for accurately detecting airflow velocity according to claim 7, characterized in that: The drive component (53) also includes a knob (535) fixedly connected to the end of the screw (534).

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