A Venturi air flow control valve

Abstract

The present invention belongs to the technical field of venturi valves, and particularly relates to a venturi airflow control valve, including a pipeline valve assembly, an explosion-proof assembly, a switch assembly, etc. The pipeline valve assembly is used for equal flow control of bidirectional airflow, the explosion-proof assembly is used to block the annular gap between the first arc portion and the second throat when the incoming flow pressure changes slowly, and to open the annular gap between the first arc portion and the second throat when the incoming flow pressure increases sharply, and the switch assembly is used to block the annular gap between the valve core and the second cylinder before the incoming flow pressure reaches the minimum pressure of the calibrated flow, and to open the annular gap between the valve core and the second cylinder after the incoming flow pressure reaches the minimum pressure of the calibrated flow. In the present invention, only the outer walls of the second arc portions of the two valve cores and the outer walls of the second throats of the two second cylinders need to be processed with high precision, and the parts and workload of high precision processing are relatively small, which effectively reduces the processing cost of the equipment.

Description

Technical Field

[0001] The invention belongs to the technical field of Venturi valves, and in particular relates to a Venturi airflow control valve. Background Art

[0002] The working principle of the Venturi control valve is based on the Venturi effect, a fluid mechanics phenomenon. When a fluid passes through a narrowing pipe (throat), its velocity increases and the pressure decreases accordingly. In the Venturi valve, this design causes the fluid to accelerate as it passes through the narrow part of the valve, causing a local pressure drop. The fluid then enters an expansion area, where the velocity decreases and the pressure recovers. In this way, the Venturi valve is able to use the dynamic characteristics of the fluid itself to control the flow. The core component of the Venturi valve is the valve core, which can move up and down or rotate as needed to change the size of the valve opening. As the fluid flows through the valve core, the pressure distribution inside the valve body affects the position of the valve core, automatically adjusting the valve opening to maintain the desired flow. This automatic adjustment feature allows the Venturi valve to maintain a constant flow output under different system pressure changes.

[0003] In order to improve the flow rate regulation accuracy of the Venturi valve, the processing accuracy of its components will be increased, which greatly increases the processing cost of the Venturi valve.

[0004] Since the valve body of the Venturi valve is relatively thin and is easily deformed by bumps, if some parts of the Venturi valve are deformed during transportation, the adjustment accuracy of the Venturi valve after it is assembled will be greatly affected.

[0005] After the parts of the Venturi valve are assembled, the position of the valve core needs to be adjusted by professionals. If the position of the valve core is not adjusted properly, the flow regulation accuracy of the valve will be affected even if the processing accuracy of the parts meets the requirements.

[0006] When a conventional Venturi valve performs equal flow control, the pressure of the incoming flow changes slowly to achieve the effect of equal flow regulation. However, when the incoming flow pressure changes quickly, the valve core will vibrate, causing the flow to vibrate, and it will take a long time to stabilize. For example, Patent 201710667295.1 adopts the principle of electromagnetic induction to solve the vibration problem, but the cost is relatively high.

[0007] When the main valve of the pipeline where the Venturi valve is located takes a long time to close or open, the Venturi valve will take a long time to pass the gas with the set flow rate. At this time, it is not easy to accurately control the total flow in the pipeline.

[0008] The Venturi valve can achieve its equal flow rate regulation function within its design pressure range. When the incoming flow pressure in the pipeline rises abnormally, the valve core of the valve will close under the action of pressure. As the pressure continues to rise, there is a risk of explosion.

[0009] In addition, some pipelines require two-way equal-flow ventilation. The traditional method is to set up two parallel pipelines and install Venturi valves on the two pipelines to work alternately, which is costly.

[0010] The present invention designs a Venturi airflow control valve to solve the above problems. Summary of the invention

[0011] Based on this, it is necessary to provide a Venturi airflow control valve for the problems existing in the current Venturi valve. In the present invention, only the outer walls of the second arc portions of the two valve cores and the outer walls of the second throats of the two second cylinders need to be processed with high precision. The parts and workload of the high precision processing are relatively small, which effectively reduces the processing cost of the equipment. The present invention can accurately calibrate the two limit state positions of the two valve cores when the pointer is respectively relative to the first calibration scale and the second calibration scale on the dial through the transmission connection between the second swing rod and the first round rod and the first rod sleeve. The position adjustment of the two valve cores can be completed without the participation of professionals, thereby realizing the high-precision equal flow adjustment of the present invention under three flow value states. When the third round rod and the second rod sleeve in the present invention are deformed during transportation, the cross universal joint structure in the second scheme of the support and guide assembly can still ensure the normal movement of the first round rod and the first rod sleeve and the normal calibration of the two limit state positions of the present invention, thereby ensuring that the present invention adjusts the three flow states within the calibration range and accurately controls the equal flow under each flow state. The elastic ring sheet and ventilation groove structure on the first ring between the second throats of the two second cylinders and the first arc portion of the first cylinder in the present invention can keep the pipeline in a ventilated state without causing expansion and explosion when the incoming flow pressure in the pipeline increases abnormally, and has high safety. The damping rod connecting the two valve cores with the first round rod and the first rod sleeve in the present invention can effectively prevent the valve core from vibrating when the incoming flow pressure in the pipeline changes sharply, thereby ensuring that the valve core does not fluctuate in the control of the flow under the corresponding flow state, and ensuring that the Venturi valve is always in an accurate equal flow control state when the incoming flow pressure in the pipeline changes sharply. The present invention can realize ventilation in two directions in turn through a pipeline as needed, and can realize high-precision equal flow control of bidirectional airflow through a Venturi valve structure, effectively reducing the equipment cost while reducing the number of pipelines and the number of Venturi valves.

[0012] The above purpose is achieved through the following technical solutions:

[0013] A Venturi airflow control valve is used to accurately control the flow of a bidirectional airflow in a pipeline, comprising:

[0014] A pipeline valve assembly is used for equal flow control of bidirectional airflow, the pipeline valve assembly includes two coaxial first cylinders, a first throat is arranged between the two first cylinders, both ends of the first throat are respectively connected to the first cylinders at the corresponding ends through first arc portions, a second cylinder having an annular gap therewith is arranged in each of the two first cylinders, a second throat having an annular gap therewith is arranged at one end of the second cylinder, a valve core having an annular gap therewith and switching the second throat is arranged in the second cylinder, a first round rod and a first rod sleeve are respectively slidably arranged in the end circular holes of the two valve cores, the first round rod slides in the first rod sleeve, and a reset spring and a damping rod are connected between the first round rod and the first rod sleeve and the corresponding valve core.

[0015] The explosion-proof component is used to block the annular gap between the first arc portion and the second throat when the incoming flow pressure changes slowly and to open the annular gap between the first arc portion and the second throat when the incoming flow pressure increases sharply.

[0016] The switch assembly is used to block the annular gap between the valve core and the second cylinder before the incoming flow pressure reaches the minimum pressure of the calibrated flow and to open the annular gap between the valve core and the second cylinder after the incoming flow pressure reaches the minimum pressure of the calibrated flow.

[0017] An adjusting component is provided, which is used to calibrate the two extreme positions of two valve cores and to precisely and synchronously adjust the positions of the two valve cores within a calibrated range, and the adjusting component is not affected by slight deformation.

[0018] In one embodiment, one end of the valve core is provided with a second arc portion that cooperates with the inner wall of the corresponding second throat, and the middle outer wall of the valve core is provided with an axially distributed first inner recess and a second inner recess, and an annular bulge with an annular gap between the first inner recess and the second inner recess is provided between the first inner recess and the second inner recess, and the other end of the valve core is open and an end cover is installed by a second bolt, and a second guide sleeve and a third guide sleeve are respectively provided at the axial circular hole of the second arc portion and the end cover, and the second guide sleeve and the third guide sleeve slide on the first round rod or the first rod sleeve, and the first rod sleeve or the first round rod is slidably arranged in the first guide sleeve in the corresponding second cylinder and the second throat, and the first guide sleeve is fixed in the second cylinder or the second throat by three circumferentially distributed fixing rods.

[0019] In one embodiment, the return spring is sleeved on the first round rod or the first rod sleeve, one end of the return spring is connected to the corresponding end cover and the other end is connected to the ring plate on the first round rod or the first rod sleeve, one end of the damping rod is connected to the ring plate and the other end is connected to the inner wall of the valve core.

[0020] In one embodiment, the second cylinder is fixed in the first cylinder by a plurality of first bolts evenly distributed in the circumference and cooperating with threaded holes on the wall of the first cylinder, and the end of the second cylinder is provided with two conical surfaces that do not block the airflow.

[0021] In one embodiment, the explosion-proof component includes a first circular ring, which is arranged on the inner wall of the first arc portion, the inner wall of the first circular ring cooperates with the outer wall of the second throat, a plurality of circumferentially evenly distributed ventilation grooves are provided on the inner wall of the first circular ring, an annular groove is provided on the inner wall of one end of the first circular ring, and an elastic ring sheet is provided in the annular groove for switching the annular space between it and the second throat.

[0022] In one embodiment, the switch assembly includes a second ring, which slides axially on the inner wall of the second cylinder and is fixedly connected to the first rod or the first rod sleeve through three circumferentially evenly distributed connecting rods. When the return spring is in a natural state, the second ring is radially opposite to the annular bulge on the outer wall of the valve core and closes the annular gap between the valve core and the second cylinder.

[0023] In one embodiment, the adjustment assembly includes a second round rod, the second round rod is fixed to the end of the first rod sleeve, the end of the second round rod is flush with the end of the first round rod, the ends of the first round rod and the second round rod are respectively threadedly connected with the second screw sleeve and the third screw sleeve, the ends of the second screw sleeve and the third screw sleeve are respectively ball-jointed with the third round rod and the fourth round rod, the third round rod is slidably provided with a second rod sleeve that is clearance-matched with the third round rod and fixedly connected with the fourth round rod, the second rod sleeve is connected to the first cylinder through a support guide assembly, and the ends of the third round rod and the second rod sleeve are respectively fixedly connected with the sixth round rod and the fifth round rod. The sum of the lengths of the fifth round rod, the second rod sleeve and the fourth round rod is equal to the sum of the lengths of the third round rod and the sixth round rod, and the radial distance between the fifth round rod and the axis of the first cylinder is equal to the radial distance between the sixth round rod and the axis of the first cylinder, so as to ensure that the reverse motion speed and amplitude of the first round rod and the first rod sleeve are the same when the first swing arm swings. The ends of the fifth round rod and the sixth round rod are both connected to the first connecting rod with ball joints, and a first swing rod is hinged between the same side ends of the two first connecting rods. The middle part of the first swing rod is located on the axis of the first cylinder and is hinged to the third support rod. The third support rod is fixed to the support frame, and the support frame is fixed in the first cylinder by a fourth bolt. One end of the first swing rod is hinged to the second connecting rod, and a first swing groove is opened on the wall surface of the first cylinder. The second swing rod is hinged in the first swing groove by a fifth bolt, and a pointer parallel to the second swing rod is provided at the exposed end of the second swing rod. The fifth bolt is threadedly connected to two first screw sleeves on the wall of the first cylinder located on both sides of the first swing groove. The fifth bolt is provided with a locking ring that cooperates with the second swing rod, and the locking ring moves in the accommodation of the side wall of the first swing groove. The groove is provided with a guide seat on the outer wall of the first cylinder, and a slide seat is sliding in the guide seat along the length direction of the second swing rod in the large flow calibration state, and a sixth bolt is threadedly connected to the slide seat, and the sixth bolt slides in the slide groove on the guide seat, and a fan-shaped dial is provided on the guide seat, and a first calibration scale of small flow and a second calibration scale of large flow are provided on the disk surface of the dial, and a small flow scale, a medium flow scale and a large flow scale are arranged between the first calibration scale and the second calibration scale in sequence, and an arc-shaped sleeve is provided at the first swing groove, and the second swing rod swings in the second swing groove on the sleeve, and an arc-shaped baffle is provided on the second swing rod for sealing the second swing groove, and a limiting ring cooperating with the first guide sleeve in the corresponding second cylinder is provided on the first round rod or the first rod sleeve.

[0024] In one embodiment, the support guide assembly includes a fourth guide sleeve, which is slidably disposed on the second rod sleeve, and three first support rods evenly distributed circumferentially are disposed on the fourth guide sleeve, and the ends of the first support rods are tightened and fixed in the first cylinder by third bolts.

[0025] In one embodiment, the support and guide assembly includes a third ring, which is sleeved on the second rod sleeve, and the inner wall of the third ring is provided with a rubber ring that slides with the second rod sleeve, and a fourth ring is provided outside the third ring, and the third ring is hinged to the fourth ring through two coaxial first round pins, and the axis of the first round pin is perpendicular to the axis of the third ring and the fourth ring, and a fifth ring is provided outside the fourth ring, and the fourth ring is hinged to the fifth ring through two coaxial second round pins, and the axis of the second round pin is perpendicular to the axis of the fourth ring and the fifth ring, and three circumferentially evenly distributed second support rods are provided on the outer side of the fifth ring, and the ends of the second support rods are tightened and fixed in the first cylinder by third bolts.

[0026] In one of the embodiments, the second connecting rod and the second swing arm are hinged by a seventh bolt, and a nut is threadedly connected to the seventh bolt to prevent it from falling off, so as to facilitate disassembly, installation and assembly.

[0027] The beneficial effects of the present invention are:

[0028] 1. In the present invention, only the outer walls of the second arc portions of the two valve cores and the outer walls of the second throats of the two second cylinders need to be processed with high precision. The parts and workload for high precision processing are relatively small, which effectively reduces the processing cost of the equipment.

[0029] 2. The present invention can accurately calibrate the two extreme state positions of the two valve cores when the pointers are respectively relative to the first calibration scale and the second calibration scale on the dial through the transmission connection between the second rocker arm, the first round rod and the first rod sleeve. The position adjustment of the two valve cores can be completed without the participation of professionals, thereby realizing the high-precision equal flow rate regulation of the present invention under three flow value states.

[0030] 3. When the third round rod and the second rod sleeve in the present invention are deformed during transportation, the cross universal joint structure in the second scheme of the support and guide assembly can still ensure the normal movement of the first round rod and the first rod sleeve and the normal calibration of the two extreme state positions of the present invention, thereby ensuring that the present invention can adjust the three flow states within the calibration range and accurately control the equal flow rate under each flow state.

[0031] 4. The elastic ring sheet and ventilation groove structure on the first ring between the second throats of the two second cylinders and the first arc portion of the first cylinder in the present invention can keep the pipeline in a ventilated state without causing expansion and explosion when the incoming flow pressure in the pipeline increases abnormally, thus having high safety.

[0032] 5. The damping rod connecting the two valve cores and the first round rod and the first rod sleeve in the present invention can effectively prevent the valve core from vibrating when the incoming flow pressure in the pipeline changes sharply, thereby ensuring that the valve core does not fluctuate in the control of the flow under the corresponding flow state, and ensuring that the Venturi valve is always in an accurate equal flow control state when the incoming flow pressure in the pipeline changes sharply.

[0033] 6. The present invention can realize ventilation in two directions in sequence through one pipeline as needed, and can realize high-precision equal flow control of bidirectional airflow through a Venturi valve structure, thereby effectively reducing equipment costs while reducing the number of pipelines and Venturi valves. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is an overall schematic diagram of the present invention;

[0035] Figure 2 is an overall cross-sectional view of the present invention;

[0036] Figure 3 is a cross-sectional view of a bidirectional airflow control structure of a pipeline valve assembly in the present invention;

[0037] Figure 4 is a cross-sectional view of an explosion-proof component in the present invention;

[0038] Figure 5 It is a cross-sectional view of the connection between the first rod sleeve and the second rod sleeve and the connection between the first round rod and the third round rod of the present invention;

[0039] Figure 6 This is a cross-sectional view of the structure of the first solution of the support and guide assembly in the present invention;

[0040] Figure 7 are two cross-sectional views of the second scheme structure of the support guide assembly in the present invention;

[0041] Figure 8 It is a cross-sectional view of the structure of the third round rod and the fifth round rod moving in opposite directions in the present invention;

[0042] Fig. 9 It is a cross-sectional view of the adjustment and locking structure of the second swing rod and the dial in the present invention;

[0043] Fig.10 It is a cross-sectional view of the detachable hinge structure of the second connecting rod and the second swing rod in the present invention;

[0044] Fig.11 It is the first cylinder and its cross-sectional view in the present invention;

[0045] Fig.12 are two partial cross-sectional views of the first cylinder in the present invention;

[0046] Fig.13is a cross-sectional view of the second cylindrical structure in the present invention;

[0047] Fig.14 is a cross-sectional view of the first circular ring structure in the present invention;

[0048] Fig.15 It is the valve core structure and its cross-sectional view in the present invention;

[0049] Fig.16 It is a structural diagram of the dial in the present invention;

[0050] Fig.17 is a schematic diagram of a second calibration position of the present invention;

[0051] Fig.18 is a schematic diagram of the first calibration position of the present invention;

[0052] Fig.19 It is a schematic diagram of the large flow control state within the calibration range of the present invention;

[0053] Name of the label in the figure:

[0054] 100, pipeline valve assembly; 101, first cylinder; 102, first throat; 103, first arc; 104, threaded hole; 105, first swing groove; 106, sleeve; 107, second swing groove; 108, first screw sleeve; 109, receiving groove; 110, second cylinder; 111, conical surface; 112, second throat; 113, first bolt; 114, fixing rod; 115, first guide sleeve; 116, valve core; 117, second arc; 118, first inner concave; 119, second inner concave; 120, annular convex; 121, second guide sleeve; 122, end cover; 123, third guide sleeve; 124, second bolt; 125, first round rod; 126, ring plate; 127, return spring; 128, damping rod; 129, first rod sleeve;

[0055] 200, explosion-proof component; 201, first circular ring; 202, ventilation groove; 203, ring groove; 204, elastic ring piece;

[0056] 300, switch assembly; 301, second ring; 302, connecting rod;

[0057] 400, adjustment assembly; 401, stop ring; 402, second round rod; 403, second screw sleeve; 404, third screw sleeve; 405, third round rod; 406, fourth round rod; 407, second rod sleeve; 408, fifth round rod; 409, sixth round rod; 410, first connecting rod; 411, first swing rod; 412, third support rod; 413, support frame; 414, fourth bolt; 415, second connecting rod; 4 16. second swing rod; 417. pointer; 418. baffle; 419. fifth bolt; 420. lock ring; 421. dial; 422. first calibration scale; 423. small flow scale; 424. medium flow scale; 425. large flow scale; 426. second calibration scale; 427. slide seat; 428. sixth bolt; 429. guide seat; 430. slide groove; 431. seventh bolt; 432. nut;

[0058] 500, support guide assembly; 501, fourth guide sleeve; 502, first support rod; 503, rubber ring; 504, third circular ring; 505, first circular pin; 506, fourth circular ring; 507, second circular pin; 508, fifth circular ring; 509, second support rod; 510, third bolt. DETAILED DESCRIPTION

[0059] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0060] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the orientation or position relationship indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0061] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0062] like Figure 1-16 As shown, a Venturi airflow control valve is used to accurately control the flow rate of bidirectional airflow in a pipeline, comprising:

[0063] A pipeline valve assembly 100 is used for equal flow control of bidirectional airflow. The pipeline valve assembly 100 includes two coaxial first cylinders 101, a first throat 102 is arranged between the two first cylinders 101, both ends of the first throat 102 are connected to the first cylinders 101 at the corresponding ends through a first arc portion 103, a second cylinder 110 with an annular gap therewith is arranged in each of the two first cylinders 101, one end of the second cylinder 110 is provided with a second throat 112 with an annular gap therewith with the corresponding first arc portion 103, a valve core 116 with an annular gap therewith and for switching the second throat 112 is arranged in the second cylinder 110, a first round rod 125 and a first rod sleeve 129 are respectively slidably arranged in the end circular holes of the two valve cores 116, the first round rod 125 slides in the first rod sleeve 129, and a reset spring 127 and a damping rod 128 are connected between the first round rod 125 and the first rod sleeve 129 and the corresponding valve core 116.

[0064] The explosion-proof assembly 200 is used to block the annular gap between the first arc portion 103 and the second throat 112 when the incoming flow pressure changes slowly and to open the annular gap between the first arc portion 103 and the second throat 112 when the incoming flow pressure increases sharply.

[0065] The switch assembly 300 is used to block the annular gap between the valve core 116 and the second cylinder 110 before the incoming flow pressure reaches the minimum pressure of the calibrated flow, and to open the annular gap between the valve core 116 and the second cylinder 110 after the incoming flow pressure reaches the minimum pressure of the calibrated flow.

[0066] The adjusting component 400 is used to calibrate the two extreme positions of the two valve cores 116 and to precisely and synchronously adjust the positions of the two valve cores 116 within the calibrated range. The adjusting component 400 is not affected by slight deformation.

[0067] In a further embodiment, Figure 3 ,13 As shown in Figures 15 and 15, one end of the valve core 116 is provided with a second arc portion 117 that matches the inner wall of the corresponding second throat 112, and the middle outer wall of the valve core 116 is provided with a first inner recess 118 and a second inner recess 119 that are axially distributed, and an annular convex 120 with an annular gap between the first inner recess 118 and the second inner recess 119 is provided, and the other end of the valve core 116 is open and is installed with an end cover 122 through a second bolt 124, and the second arc portion 1 A second guide sleeve 121 and a third guide sleeve 123 are respectively provided at the axial circular holes of 17 and the end cover 122, and the second guide sleeve 121 and the third guide sleeve 123 slide on the first round rod 125 or the first rod sleeve 129, and the first rod sleeve 129 or the first round rod 125 is slidably provided in the first guide sleeve 115 in the corresponding second cylinder 110 and the second throat 112, and the first guide sleeve 115 is fixed in the second cylinder 110 or the second throat 112 by three circumferentially distributed fixing rods 114.

[0068] In a further embodiment, Figure 3 As shown, the return spring 127 is sleeved on the first round rod 125 or the first rod sleeve 129, one end of the return spring 127 is connected to the corresponding end cover 122 and the other end is connected to the ring plate 126 on the first round rod 125 or the first rod sleeve 129, one end of the damping rod 128 is connected to the ring plate 126 and the other end is connected to the inner wall of the valve core 116.

[0069] In a further embodiment, Figure 3 , 11 As shown, the second cylinder 110 is fixed in the first cylinder 101 by a plurality of first bolts 113 evenly distributed in the circumference and cooperating with the threaded holes 104 on the cylinder wall of the first cylinder 101, and the end of the second cylinder 110 is provided with two conical surfaces 111 which do not block the airflow.

[0070] In a further embodiment, Figure 3 , 4 As shown in Figures 14, the explosion-proof component 200 includes a first circular ring 201, which is arranged on the inner wall of the first arc portion 103. The inner wall of the first circular ring 201 cooperates with the outer wall of the second throat 112. A plurality of circumferentially evenly distributed ventilation grooves 202 are provided on the inner wall of the first circular ring 201. An annular groove 203 is provided on the inner wall of one end of the first circular ring 201. An elastic ring sheet 204 for switching the annular space between the first circular ring 201 and the second throat 112 is provided in the annular groove 203.

[0071] In a further embodiment, Figure 3 , 4As shown in Figures 15, the switch assembly 300 includes a limit ring 401, which is arranged on the first round rod 125 or the first rod sleeve 129. The limit ring 401 is connected to the second ring 301 axially sliding on the inner wall of the second cylinder 110 through three circumferentially evenly distributed connecting rods 302. When the reset spring 127 is in a natural state, the second ring 301 is radially opposite to the annular protrusion 120 on the outer wall of the valve core 116 and closes the annular gap between the valve core 116 and the second cylinder 110.

[0072] The switch assembly 300 includes a second ring 301, which slides axially on the inner wall of the second cylinder 110 and is fixedly connected to the first rod 125 or the first rod sleeve 129 through three circumferentially evenly distributed connecting rods 302. When the reset spring 127 is in a natural state, the second ring 301 is radially opposite to the annular protrusion 120 on the outer wall of the valve core 116 and closes the annular gap between the valve core 116 and the second cylinder 110.

[0073] In a further embodiment, Figure 1-9As shown, the adjustment component 400 includes a second round rod 402, which is fixed to the end of the first rod sleeve 129, and the end of the second round rod 402 is flush with the end of the first round rod 125. The ends of the first round rod 125 and the second round rod 402 are respectively threadedly connected with a second screw sleeve 403 and a third screw sleeve 404, and the ends of the second screw sleeve 403 and the third screw sleeve 404 are respectively ball-jointed with a third round rod 405 and a fourth round rod 406, and the third round rod 405 is slidably provided with a second rod sleeve 407 that is clearance-matched with the third round rod 405 and is fixedly connected to the fourth round rod 406, and the second rod sleeve 407 is connected to the first cylinder 101 via a support guide component 500, and the ends of the third round rod 405 and the second rod sleeve 407 are respectively fixedly connected with a sixth round rod 409 and a fifth round rod 408. The sum of the lengths of the fifth round rod 408, the second rod sleeve 407 and the fourth round rod 406 is equal to the sum of the lengths of the third round rod 405 and the sixth round rod 409, and the radial distance between the fifth round rod 408 and the axis of the first cylinder 101 is equal to the radial distance between the sixth round rod 409 and the axis of the first cylinder 101, ensuring that the reverse movement speed and amplitude of the first round rod 125 and the first rod sleeve 129 are the same when the first swing rod 411 swings.The ends of the fifth round rod 408 and the sixth round rod 409 are both connected to the first connecting rod 410 by ball joints, and the first swing rod 411 is hinged between the same side ends of the two first connecting rods 410. The middle part of the first swing rod 411 is located on the axis of the first cylinder 101 and is hinged to the third support rod 412. The third support rod 412 is fixed on the support frame 413, and the support frame 413 is fixed in the first cylinder 101 by the fourth bolt 414. One end of the first swing rod 411 is hinged to the second connecting rod 415. The first cylinder A first swing groove 105 is provided on the wall surface of the first cylinder 101, a second swing rod 416 is hinged in the first swing groove 105 through a fifth bolt 419, a pointer 417 parallel to the second swing rod 416 is provided at the exposed end thereof, the fifth bolt 419 is threadedly connected to two first screw sleeves 108 on the wall of the first cylinder 101 located on both sides of the first swing groove 105, a locking ring 420 cooperating with the second swing rod 416 is provided on the fifth bolt 419, and the locking ring 420 moves in the receiving groove 109 on the side wall of the first swing groove 105 The outer wall of the first cylinder 101 is provided with a guide seat 429, and a slide seat 427 is slidable in the guide seat 429 along the length direction of the second swing rod 416 in the large flow calibration state. The slide seat 427 is threadedly connected with a sixth bolt 428, and the sixth bolt 428 slides in a slide groove 430 on the guide seat 429. A sector-shaped dial 421 is provided on the guide seat 429, and a first calibration scale 422 for small flow and a second calibration scale 426 for large flow are provided on the disk surface of the dial 421. The first calibration scale A small flow scale 423, a medium flow scale 424 and a large flow scale 425 are arranged in sequence between 422 and the second calibration scale 426, an arc-shaped sleeve 106 is arranged at the first swing groove 105, the second swing rod 416 swings in the second swing groove 107 on the sleeve 106, and the second swing rod 416 is provided with an arc-shaped baffle 418 for sealing the second swing groove 107, and the first round rod 125 or the first rod sleeve 129 is provided with a limiting ring 401 that cooperates with the first guide sleeve 115 in the corresponding second cylinder 110.

[0074] In a further embodiment, Figure 6 As shown, the support guide assembly 500 includes a fourth guide sleeve 501, which is slidably set on the second rod sleeve 407, and three first support rods 502 evenly distributed circumferentially are set on the fourth guide sleeve 501. The ends of the first support rods 502 are tightened and fixed in the first cylinder 101 by third bolts 510.

[0075] In a further embodiment, Figure 7As shown, the support guide assembly 500 includes a third ring 504, the third ring 504 is sleeved on the second rod sleeve 407, the inner wall of the third ring 504 is provided with a rubber ring 503 that slides with the second rod sleeve 407, the third ring 504 is provided with a fourth ring 506 outside, the third ring 504 is hinged with the fourth ring 506 through two coaxial first round pins 505, the axis of the first round pin 505 is aligned with the axis of the third ring 504 and the fourth ring 506 The lines intersect perpendicularly, a fifth ring 508 is arranged outside the fourth ring 506, the fourth ring 506 is hinged to the fifth ring 508 through two coaxial second round pins 507, the axis of the second round pin 507 intersects perpendicularly with the axes of the fourth ring 506 and the fifth ring 508, three circumferentially evenly distributed second support rods 509 are arranged on the outside of the fifth ring 508, and the ends of the second support rods 509 are tightened and fixed in the first cylinder 101 by third bolts 510.

[0076] In a further embodiment, Fig.10 As shown, the second connecting rod 415 and the second swing rod 416 are hingedly connected by a seventh bolt 431, and a nut 432 is threadedly connected to the seventh bolt 431 to prevent it from falling off, so as to facilitate disassembly, installation and assembly.

[0077] In the present invention, only the outer walls of the second arc portions 117 of the two valve cores 116 and the outer walls of the second throats 112 of the two second cylinders 110 need to be processed with high precision, and the parts and workload of the high precision processing are relatively small, which effectively reduces the processing cost of the equipment. The present invention can accurately calibrate the two extreme state positions of the two valve cores 116 when the pointer 417 is respectively opposite to the first calibration scale 422 and the second calibration scale 426 on the dial 421 through the transmission connection between the second swing rod 416 and the first round rod 125 and the first rod sleeve 129, and the position adjustment of the two valve cores 116 can be completed without the participation of professionals, thereby realizing the high-precision equal flow rate adjustment of the present invention under three flow value states. When the third round rod 405 and the second rod sleeve 407 of the present invention are deformed during transportation, the cross universal joint structure in the second scheme of the support guide assembly 500 can still ensure the normal movement of the first round rod 125 and the first rod sleeve 129 and the normal calibration of the two extreme state positions of the present invention, thereby ensuring that the present invention can adjust three flow states within the calibration range and accurately control the equal flow rate under each flow state. The elastic ring sheet 204 and the ventilation groove 202 structure on the first ring 201 between the second throat 112 of the two second cylinders 110 and the first arc portion 103 of the first cylinder 101 of the present invention can keep the pipeline in a ventilated state when the incoming flow pressure in the pipeline increases abnormally without causing bloating and explosion, and has high safety. The damping rod 128 connecting the two valve cores 116 with the first round rod 125 and the first rod sleeve 129 in the present invention can effectively prevent the valve core 116 from vibrating when the incoming flow pressure in the pipeline changes sharply, thereby ensuring that the valve core 116 does not fluctuate in the control of the flow under the corresponding flow state, and ensuring that the Venturi valve is always in an accurate equal flow control state when the incoming flow pressure in the pipeline changes sharply. The present invention can realize ventilation in two directions in turn through a pipeline as needed, and can realize high-precision equal flow control of bidirectional airflow through a Venturi valve structure, effectively reducing the equipment cost while reducing the number of pipelines and the number of Venturi valves.

[0078] The assembly process of the present invention is as follows:

[0079] In the initial state, each second cylinder 110 in the present invention is an integral component with the corresponding valve core 116 and the first round rod 125 or the first rod sleeve 129, the support guide assembly 500 is an integral component with the structure on the third round rod 405 and the second rod sleeve 407, the return spring 127 is in a natural state, the second ring 301 is radially opposite to the annular protrusion 120 of the corresponding valve core 116, and the second connecting rod 415 is not connected to the second swing rod 416. The inner wall of the second throat 112 and the outer wall of the second arc portion 117 of the valve core 116 in the present invention need to be finely processed.

[0080] The components of the two second cylinders 110 are respectively inserted into the two first cylinders 101, so that the second throats 112 of the two second cylinders 110 abut against the inner wall of the corresponding first ring 201 and the elastic ring sheet 204, and the first round rod 125 is inserted into the first rod sleeve 129, and the two second cylinders 110 are fixed coaxially with the first cylinder 101 by installing the first bolt 113 in the threaded hole 104 on the wall of the first cylinder 101.

[0081] Then, the supporting and guiding assembly 500 and the structure on the third round rod 405 and the second rod sleeve 407 are integrally inserted into the first cylinder 101, the first round rod 125 is threadedly connected with the second screw sleeve 403, the second round rod 402 is threadedly connected with the third screw sleeve 404, the first supporting rod 502 in the first scheme of the supporting and guiding assembly 500 is fixed in the first cylinder 101 by the third bolt 510, or the second supporting rod 509 in the second scheme of the supporting and guiding assembly 500 is fixed in the first cylinder 101 by the third bolt 510, and the cross universal joint structure composed of the rubber ring 503 and the third round ring 504, the fourth round ring 506 and the fifth round ring 508 in the second scheme of the supporting and guiding assembly 500 ensures that the third round rod 405 and the second rod sleeve 407 can move axially normally while ensuring that the third round rod 405 and the second rod sleeve 407 can still move unaffected when deformed due to transportation collision and be effectively supported by the supporting and guiding assembly 500. Next, the support frame 413 is fixed inside the first cylinder 101 by means of the fourth bolt 414 .

[0082] Then, the second rocker arm 416 is installed in the first rocker slot 105 by the fifth bolt 419, and the second connecting rod 415 and the second rocker arm 416 are hinged by the seventh bolt 431 and a nut 432 is installed on the seventh bolt 431 to prevent it from falling off, so as to facilitate the disassembly and assembly of the second rocker arm 416 and the second connecting rod 415.

[0083] Next, the positions of the two valve cores 116 are calibrated at two extreme states to ensure that the present invention can perform three-stage precise equal flow control on the bidirectional airflow in the two first cylinders 101 after the calibration is completed.

[0084] The calibration process is as follows:

[0085] like Fig.17 As shown, the second rocker arm 416 is manually swung to the extreme position on one side of the second rocker slot 107 corresponding to the second calibration scale 426 on the dial 421 and the fifth bolt 419 is tightened, so that the locking ring 420 is tightly pressed against the second rocker arm 416 and locks the position state of the second rocker arm 416, and the pointer 417 is exactly opposite to the second calibration scale 426 on the dial 421.

[0086] Next, the second screw sleeve 403 and the third screw sleeve 404 are rotated respectively, so that the first round rod 125 and the second round rod 402 perform axial movement of appropriate amplitude, and the second round rod 402 drives the first rod sleeve 129 to move synchronously, and the first round rod 125 and the first rod sleeve 129 have equal movement amplitudes and opposite directions, and the limit rings 401 on the first round rod 125 and the first rod sleeve 129 press against the first guide sleeve 115 on the corresponding side, and the first round rod 125 and the first rod sleeve 129 respectively drive the corresponding valve core 116 to open the corresponding second throat 112 to the maximum degree through the corresponding ring plate 126 and the return spring 127.

[0087] Then, if Fig.18 As shown, the second swing rod 416 is manually swung to the extreme position on one side of the second swing slot 107 corresponding to the first calibration scale 422 on the dial 421 and the fifth bolt 419 is tightened, so that the locking ring 420 is tightly pressed against the second swing rod 416 and the position state of the second swing rod 416 is locked. Then, the sixth bolt 428 is loosened to move the slide 427 to drive the dial 421 to move along the guide seat 429. When the first calibration scale 422 on the dial 421 is exactly opposite to the pointer 417, the slide 427 is stopped from moving and the position of the dial 421 is locked by tightening the sixth bolt 428.

[0088] Next, the second screw sleeve 403 and the third screw sleeve 404 are rotated respectively, so that the first round rod 125 and the second round rod 402 perform axial movement of appropriate amplitude, and the second round rod 402 drives the first rod sleeve 129 to move synchronously, and the movement amplitude of the first round rod 125 and the first rod sleeve 129 is equal and the direction is opposite, and the limit ring 401 on the first round rod 125 and the first rod sleeve 129 is farthest from the first guide sleeve 115 on the corresponding side, and the first round rod 125 and the first rod sleeve 129 respectively drive the corresponding valve core 116 through the corresponding ring plate 126 and the return spring 127 to just complete the closing of the corresponding second throat 112.

[0089] The calibration of the two extreme positions of the two valve cores 116 in the present invention can ensure more accurate equal flow control of the airflow at three different flow gears during subsequent use.

[0090] After the calibration of the two limit positions of the two valve cores 116 is completed, Fig.19 As shown, if it is necessary to perform equal flow control on the airflow at the flow level corresponding to the large flow scale 425 on the dial 421, manually swing the second swing arm 416 to the position in the second swing slot 107 corresponding to the large flow scale 425 on the dial 421 and tighten the fifth bolt 419, so that the locking ring 420 presses tightly against the second swing arm 416 and locks the position state of the second swing arm 416, and the large flow scale 425 on the dial 421 is exactly opposite to the pointer 417.

[0091] In the process of moving the pointer 417 toward the large flow scale 425, the second swing rod 416 drives the two first connecting rods 410 to swing through the second connecting rod 415 and the first swing rod 411, one first connecting rod 410 drives the first rod sleeve 129 to axially move a certain amplitude through the fifth round rod 408, the second rod sleeve 407, the fourth round rod 406, the third screw sleeve 404, and the second round rod 402, and the other first connecting rod 410 drives the first round rod 125 to axially move a certain amplitude through the sixth round rod 409, the third round rod 405, and the second screw sleeve 403. The first round rod 125 and the first rod sleeve 129 respectively drive the corresponding valve core 116 to move a certain amplitude through the corresponding ring plate 126 and the return spring 127, and the amplitudes of movement of the two valve cores 116 are equal, the openings between the second arc portions 117 on the two valve cores 116 and the corresponding second throats 112 are equal, and the second ring 301 closes the annular gap between the annular convexity 120 on the corresponding valve core 116 and the second cylinder 110. At this point, the adjustment of the positions of the two valve cores 116 to the flow control position corresponding to the specified flow gear is completed.

[0092] like Fig.19 As shown, if the airflow flows from the first cylinder 101 on the valve core 116 side directly matched with the first round rod 125 to the first cylinder 101 on the valve core 116 side directly matched with the first rod sleeve 129, before the pressure of the airflow reaches the minimum pressure corresponding to the large flow scale 425, if the pressure of the airflow changes slowly, the airflow will not overcome the return spring 127 to push the valve core 116 on the inlet side to move, and the airflow will not leak to the other first cylinder 101 because the second ring 301 closes the gap between the annular protrusion 120 on the valve core 116 and the first cylinder 101. At the same time, the gap between the second cylinder 110 on the airflow inlet side and the first cylinder 101 is blocked by the corresponding elastic ring sheet 204, and no airflow pressure loss or gas leakage will occur.

[0093] When the airflow pressure slowly reaches the minimum pressure corresponding to the large flow scale 425, the valve core 116 on the airflow inlet side overcomes the corresponding return spring 127 under the action of the airflow pressure and moves deeper into the second throat 112 relative to the second cylinder 110 and the first round rod 125 to a certain extent, so that the opening of the second throat 112 on the airflow inlet side is reduced. At the same time, the second ring 301 on the airflow inlet side opens the gap between the annular protrusion 120 on the corresponding valve core 116 and the second cylinder 110, and due to the existence of the second inner concave portion 119 on the valve core 116, the movement of the airflow to the other first cylinder 101 is not affected by the shielding of the second ring 301. The smaller the reduction in the opening of the second throat 112 caused by the movement of the valve core 116, the smaller the incoming flow pressure, and the larger the reduction in the opening of the second throat 112, the greater the incoming flow pressure, thereby achieving equal flow regulation of the airflow by the valve core 116.

[0094] When the valve core 116 in the first cylinder 101 on the air inlet side reduces the opening of the corresponding second throat 112, the air enters the first throat 102 through the second throat 112 and reaches the second throat 112 and the first arc portion 103 corresponding to the first cylinder 101 on the other end, the air will not leak from the gap between the second throat 112 and the first cylinder 101 due to the action of the elastic ring sheet 204 on the air outlet side. At the same time, the air entering the second throat 112 corresponding to the first rod sleeve 129 overcomes the corresponding return spring 127 to push the valve core 116 to move a certain amplitude, so that the annular protrusion 120 on the valve core 116 corresponding to the first rod sleeve 129 is staggered with the corresponding ring plate 126, so that the air passes through the gap between the annular protrusion 120 on the valve core 116 and the first cylinder 101. If the air enters in the opposite direction, the process is the same as above.

[0095] When the incoming flow pressure changes rapidly, the valve core 116 on the airflow inlet side will not instantly close or open the corresponding second throat 112 due to the presence of the corresponding damper, thereby avoiding vibration of the valve core 116 when the incoming flow pressure changes rapidly, thereby ensuring that the valve core 116 accurately controls the equal flow rate of the airflow. During the rapid change of the incoming flow pressure, due to the existence of the damping rod 128 in the valve core 116 on the corresponding side, the valve core 116 will not move, and the gap between the annular protrusion 120 on the valve core 116 and the second cylinder 110 will not open. The airflow of the first cylinder 101 will be swelled, and the airflow pressure will increase sharply. The airflow with a sharply increased pressure overcomes the resistance of the corresponding elastic ring piece 204 through the ventilation groove 202 on the first ring 201, causing the elastic ring piece 204 to deform, thereby making the gap between the first cylinder 101 and the second cylinder 110 and the second arc portion 117 unblocked, and the airflow entering the other first arc portion 103 overcomes the corresponding elastic ring piece 204 to open the gap between the other first cylinder 101 and the second cylinder 110, so that the airflow in the pipeline due to the sharp increase in pressure can be vented without explosion.

[0096] The end cover 122 at the opening of the valve core 116 is for facilitating the disassembly and assembly between the first round rod 125 or the first rod sleeve 129 and the valve core 116 .

Claims

1. A Venturi airflow control valve, used for accurately controlling the flow of bidirectional airflow in a pipeline, characterized in that: include: A pipeline valve assembly is used for equal flow control of bidirectional airflow, the pipeline valve assembly comprises two coaxial first cylinders, a first throat is arranged between the two first cylinders, both ends of the first throat are respectively connected to the first cylinders at the corresponding ends through first arc portions, a second cylinder having an annular gap therewith is arranged in each of the two first cylinders, a second throat having an annular gap therewith is arranged at one end of the second cylinder, a valve core having an annular gap therewith and switching the second throat is arranged in the second cylinder, a first round rod and a first rod sleeve are respectively slidably arranged in the end circular holes of the two valve cores, the first round rod slides in the first rod sleeve, and a reset spring and a damping rod are connected between the first round rod and the first rod sleeve and the corresponding valve core; An explosion-proof component, used to block the annular gap between the first arc portion and the second throat when the incoming flow pressure changes slowly and to open the annular gap between the first arc portion and the second throat when the incoming flow pressure increases sharply; A switch assembly, used for blocking the annular gap between the valve core and the second cylinder before the incoming flow pressure reaches the minimum pressure of the calibrated flow rate and opening the annular gap between the valve core and the second cylinder after the incoming flow pressure reaches the minimum pressure of the calibrated flow rate; An adjusting component, used for calibrating the two extreme positions of the two valve cores and accurately and synchronously adjusting the positions of the two valve cores within the calibrated range, wherein the adjusting component is not affected by slight deformation; The adjusting component comprises a second round rod, the second round rod is fixed to the end of the first rod sleeve, the end of the second round rod is flush with the end of the first round rod, the ends of the first round rod and the second round rod are respectively threadedly connected with the second screw sleeve and the third screw sleeve, the ends of the second screw sleeve and the third screw sleeve are respectively ball-jointed with the third round rod and the fourth round rod, the third round rod is slidably provided with a second rod sleeve which is clearance-matched and fixedly connected to the fourth round rod, the second rod sleeve is connected to the first cylinder through a supporting guide component, the ends of the third round rod and the second rod sleeve are respectively fixedly connected with the sixth round rod and the fifth round rod, the The sum of the lengths of the fifth round rod, the second rod sleeve and the fourth round rod is equal to the sum of the lengths of the third round rod and the sixth round rod, the radial distance between the fifth round rod and the axis of the first cylinder is equal to the radial distance between the sixth round rod and the axis of the first cylinder, the ends of the fifth round rod and the sixth round rod are both ball-jointed with a first connecting rod, a first swing rod is hinged between the same-side ends of the two first connecting rods, the middle part of the first swing rod is located on the axis of the first cylinder and is hinged to the third support rod, the third support rod is fixed to the support frame, the support frame is fixed in the first cylinder by a fourth bolt, one end of the first swing rod is hinged with a second Connecting rod, a first swing groove is provided on the wall surface of the first cylinder, a second swing rod is hinged in the first swing groove through a fifth bolt, a pointer parallel to the second swing rod is provided at the exposed end, the fifth bolt is threadedly connected to two first screw sleeves on the wall of the first cylinder located on both sides of the first swing groove, a locking ring matched with the second swing rod is provided on the fifth bolt, the locking ring moves in the accommodating groove on the side wall of the first swing groove, a guide seat is provided on the outer wall of the first cylinder, a sliding seat is sliding in the guide seat along the length direction of the second swing rod in the large flow calibration state, and a sixth bolt is threadedly connected to the sliding seat The sixth bolt slides in the slide groove on the guide seat, and a fan-shaped dial is arranged on the guide seat. A first calibration scale for small flow and a second calibration scale for large flow are arranged on the disk surface of the dial. A small flow scale, a medium flow scale and a large flow scale are arranged between the first calibration scale and the second calibration scale in sequence. An arc-shaped sleeve is arranged at the first swing groove, and the second swing rod swings in the second swing groove on the sleeve. An arc-shaped baffle sealing the second swing groove is arranged on the second swing rod, and a limiting ring cooperating with the first guide sleeve in the corresponding second cylinder is arranged on the first round rod or the first rod sleeve.

2. A Venturi airflow control valve according to claim 1, characterized in that: One end of the valve core is provided with a second arc portion that cooperates with the corresponding second throat inner wall, the middle outer wall of the valve core is provided with an axially distributed first inner recess and a second inner recess, an annular convexity with an annular gap between the first inner recess and the second inner recess is provided, the other end of the valve core is open and an end cover is installed by a second bolt, the second arc portion and the axial circular hole of the end cover are respectively provided with a second guide sleeve and a third guide sleeve, the second guide sleeve and the third guide sleeve slide on the first round rod or the first rod sleeve, the first rod sleeve or the first round rod is slidably arranged in the first guide sleeve in the corresponding second cylinder and the second throat, and the first guide sleeve is fixed in the second cylinder or the second throat by three circumferentially distributed fixing rods.

3. A Venturi airflow control valve according to claim 2, characterized in that: The return spring is sleeved on the first round rod or the first rod sleeve, one end of the return spring is connected to the corresponding end cover and the other end is connected to the ring plate on the first round rod or the first rod sleeve, one end of the damping rod is connected to the ring plate and the other end is connected to the inner wall of the valve core.

4. A Venturi airflow control valve according to claim 1, characterized in that: The second cylinder is fixed in the first cylinder by a plurality of first bolts which are evenly distributed in the circumference and matched with threaded holes on the cylinder wall of the first cylinder. The end of the second cylinder is provided with two conical surfaces which do not block the airflow.

5. The Venturi airflow control valve according to claim 1, characterized in that: The explosion-proof component includes a first circular ring, which is arranged on the inner wall of the first arc portion, and the inner wall of the first circular ring cooperates with the outer wall of the second throat. A plurality of circumferentially evenly distributed ventilation grooves are provided on the inner wall of the first circular ring. An annular groove is provided on the inner wall of one end of the first circular ring, and an elastic ring sheet for opening and closing the annular space between the first circular ring and the second throat is provided in the annular groove.

6. A Venturi airflow control valve according to claim 2, characterized in that: The switch assembly includes a second ring, which slides axially on the inner wall of the second cylinder and is fixedly connected to the first rod or the first rod sleeve through three circumferentially evenly distributed connecting rods. When the reset spring is in a natural state, the second ring is radially opposite to the annular convexity of the outer wall of the valve core and closes the annular gap between the valve core and the second cylinder.

7. The Venturi airflow control valve according to claim 1, characterized in that: The support guide assembly includes a fourth guide sleeve, which is slidably arranged on the second rod sleeve. Three first support rods evenly distributed circumferentially are arranged on the fourth guide sleeve, and the ends of the first support rods are tightened and fixed in the first cylinder by third bolts.

8. The Venturi airflow control valve according to claim 1, characterized in that: The support and guide assembly includes a third ring, which is sleeved on the second rod sleeve. The inner wall of the third ring is provided with a rubber ring that slides with the second rod sleeve. A fourth ring is provided outside the third ring. The third ring is hinged to the fourth ring through two coaxial first round pins, and the axis of the first round pin is perpendicular to the axis of the third ring and the fourth ring. A fifth ring is provided outside the fourth ring. The fourth ring is hinged to the fifth ring through two coaxial second round pins, and the axis of the second round pin is perpendicular to the axis of the fourth ring and the fifth ring. Three circumferentially evenly distributed second support rods are provided on the outer side of the fifth ring, and the ends of the second support rods are tightened and fixed in the first cylinder by third bolts.

9. The Venturi airflow control valve according to claim 1, characterized in that: The second connecting rod is hinged to the second swing arm via a seventh bolt, and a nut is threadedly connected to the seventh bolt to prevent the nut from falling off.

Images