High-precision Venturi effect flow control support mechanism, damper and valve body

Abstract

The invention relates to the field of Venturi effect valves, and discloses a high-precision Venturi effect flow control support mechanism, a damper and a valve body. The support mechanism comprises a movable shaft, a valve element assembly and a valve element assembly, wherein the movable shaft is arranged in the axial direction of the Venturi barrel and is coaxial with the valve element assembly; the fixed connecting piece is fixedly arranged on the valve element assembly and fixedly connected with the end, close to the valve element assembly, of the movable shaft. The sliding connecting piece is arranged on the movable shaft in a sleeving manner, is in sliding fit with the movable shaft and limits the radial displacement of the movable shaft; the movable support units are evenly distributed around the movable shaft in the circumferential direction, and each movable support unit comprises a barrel fixing arm, a valve element restraining arm and a dynamic balance arm. When the valve element assembly moves in the axial direction of the movable shaft, radial displacement of the valve element assembly is restrained synchronously through cooperation of the movable shaft, the sliding connecting piece and the movable support unit, and the coaxiality of the valve element assembly and the Venturi barrel is maintained.

Description

Technical Field

[0001] This application relates to the field of Venturi effect valves, and particularly to a high-precision Venturi effect flow control support mechanism, a damper, and a valve body. Background Art

[0002] The spool supports of existing Venturi effect valves mainly adopt two methods: one is to use fixed brackets at both ends. For example, the push rod device disclosed in the patent document CN218780838U requires fixed support structures on both sides of the valve body and needs to cooperate with a longer cylinder to cover the valve stroke space, resulting in an increase in the overall length of the valve and making it difficult to adapt to a compact pipeline system; the other is to use a single-sided cantilever bracket. For example, the push rod type actuator structure mentioned in the patent document CN217842729U is specifically a cantilever support structure on one side of the spool. Although it can shorten part of the length, it is necessary to maintain stability by lengthening the cantilever or sacrificing the centering, and it is easy to deflect due to the self-weight of the spool or fluid pressure, affecting the control accuracy. The above existing technologies have the following problems: the valve length is limited, making it difficult to adapt to a narrow installation environment; the cantilever support is prone to cause radial offset of the spool, reducing the flow regulation accuracy; the materials and transportation costs of the long cylinder are relatively high, and the installation complexity increases. Summary of the Invention

[0003] In order to solve the problems of the excessive overall length of the valve, insufficient centering of the spool, and poor adaptability to the installation space in the existing technology, this application provides a high-precision Venturi effect flow control support mechanism. The specific solution is as follows: A high-precision Venturi effect flow control support mechanism is arranged inside a Venturi cylinder and is used for the movable connection between a spool assembly and the Venturi cylinder. The high-precision Venturi effect flow control support mechanism includes: A movable shaft is arranged along the axial direction of the Venturi cylinder and is coaxial with the spool assembly; A fixed connecting piece is fixed on the spool assembly and is fixedly connected to one end of the movable shaft close to the spool assembly; A sliding connecting piece is sleeved on the movable shaft and is in sliding fit with the movable shaft, and restricts the radial displacement of the movable shaft; At least three movable support units are circumferentially distributed around the movable shaft. Each movable support unit includes: A cylinder fixing arm, one end of which is fixed to the inner wall of the Venturi cylinder; A spool constraint arm, one end of which is hinged to the fixed connecting piece; A dynamic balance arm, one end of which is hinged to the sliding connecting piece; The other ends of the cylinder fixing arm, the spool constraint arm, and the dynamic balance arm are hinged to each other; When the valve core assembly moves axially along the movable shaft, through the cooperation of the movable shaft with the sliding connecting piece and the movable support unit, the radial displacement of the valve core assembly is synchronously restricted, and the coaxiality between the valve core assembly and the Venturi cylinder is maintained.

[0004] Preferably, the hinged connection between the valve core restraint arm and the fixed connecting piece, the hinged connection between the dynamic balance arm and the sliding connecting piece, and the hinged connections among the cylinder body fixed arm, the valve core restraint arm and the dynamic balance arm are all realized through pin shafts; the axis of the pin shaft is perpendicular to the axial direction of the movable shaft to allow each arm to freely rotate around the axis of the pin shaft.

[0005] Preferably, three movable support units are provided, and the three movable support units are circumferentially evenly distributed around the movable shaft, and the included angle between adjacent movable support units is 120°.

[0006] Preferably, four movable support units are provided, and the four movable support units are circumferentially evenly distributed around the movable shaft, and the included angle between adjacent movable support units is 90°.

[0007] The present application also provides a high-precision Venturi effect flow control damper, including: the above-mentioned bracket mechanism, a damper cylinder, an elastic component, a first end cover, a second end cover and a piston. The damper cylinder passes through the valve core of the valve core assembly, and the damper cylinder is coaxially arranged with the valve core of the valve core assembly and fixedly connected to the valve core of the valve core assembly. A first end cover is fixedly arranged at the first end of the damper cylinder, a second end cover is fixedly arranged at the second end of the damper cylinder, the piston is arranged in the damper cylinder and is slidably matched with the damper cylinder, the first end cover is penetrated by the movable shaft of the bracket mechanism, the movable shaft is fixedly connected to the piston, and the elastic component is arranged between the first end cover and the piston. When the first end cover moves relative to the piston, the elastic component can restrict the movement of the first end cover.

[0008] The present application also provides a high-precision Venturi effect flow control valve body, including: a Venturi cylinder, a valve core assembly, and a bracket mechanism. The valve core assembly is movably connected to the Venturi cylinder through the bracket mechanism.

[0009] One or more technical solutions provided in the present application have at least the following technical effects or advantages: 1. Through the collaborative design of the movable support unit and the sliding connecting piece, the limitation of the traditional fixed bracket at both ends is cancelled, the overall length of the Venturi effect valve is reduced to adapt to a compact pipeline system. In addition, the shortening of the Venturi cylinder reduces the material consumption. At the same time, since only one end needs to be fixed, the installation process is simplified, and the manufacturing cost and maintenance cost are reduced; 2. The movable support unit forms a linkage mechanism through three-arm hinging, dynamically constrains the radial displacement during the axial movement of the spool assembly, controls the coaxiality error between the spool assembly and the Venturi cylinder, enhances the centering of the spool, and thus improves the flow control accuracy. 3. By circumferentially arranging 3 or 4 movable support units evenly, different load requirements can be adapted, taking into account both stability and redundancy. 4. The damper can enhance the stability of the spool assembly. Description of the Drawings

[0010] In order to more clearly illustrate the technical solutions in the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings described below are only exemplary. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0011] Figure 1 is a schematic diagram of the high-precision Venturi effect flow control support mechanism of the present application installed in the Venturi cylinder; Figure 2 is a schematic structural diagram of the high-precision Venturi effect flow control support mechanism of the present application from the first perspective; Figure 3 is a schematic structural diagram of the high-precision Venturi effect flow control support mechanism of the present application from the second perspective; Figure 4 is a schematic diagram of the high-precision Venturi effect flow control damper provided on the spool of the present application; Figure 5 is a schematic diagram of a Venturi valve and a spool assembly in the prior art.

[0012] In the figure: 1. Venturi cylinder; 2. Spool assembly; 31. Cylinder fixing arm; 32. Spool constraint arm; 33. Dynamic balance arm; 41. Fixed connecting piece; 42. Sliding connecting piece; 5. Movable shaft; 61. Damper cylinder; 62. Elastic component; 63. First end cover; 64. Second end cover; 65. Piston. Detailed Embodiments

[0013] The following will clearly and completely describe the technical solutions in the embodiments of the present application in conjunction with the drawings of the present application. Obviously, the described embodiments of the present application are only some of the embodiments of the present application, rather than all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present application.

[0014] Please refer to Figure 1 , Figure 1Schematic diagram of the installation of a high-precision Venturi effect flow control support mechanism inside a Venturi cylinder. The high-precision Venturi effect flow control support mechanism is disposed inside the Venturi cylinder 1 and is used for the movable connection between the valve core assembly 2 and the Venturi cylinder 1. The high-precision Venturi effect flow control support mechanism includes: A movable shaft 5, arranged along the axial direction of the Venturi cylinder 1 and coaxial with the valve core assembly 2; A fixed connecting member 41, fixedly arranged on the valve core assembly 2 and fixedly connected to one end of the movable shaft 5 close to the valve core assembly 2, that is, the movable shaft 5 is fixedly connected to the valve core assembly 2 through the fixed connecting member 41; alternatively, the movable shaft 5 can be directly fixedly connected to the valve core assembly 2, the fixed connecting member 41 is fixedly connected to the movable shaft 5 through a set screw, and the movable shaft 5 is provided with a snap ring groove, and the stability of the fixed connection between the fixed connecting member 41 and the movable shaft 5 is further enhanced by setting the snap ring groove and the snap ring.

[0015] A sliding connecting member 42, sleeved on the movable shaft 5 and forming an axial sliding fit with the movable shaft 5, and restricting the radial displacement of the movable shaft 5. Specifically, when the valve core assembly 2 is adjusted, it is to prevent the movable shaft 5 from moving radially. If the movable shaft 5 moves radially, it will affect the adjustment accuracy; At least three movable support units, circumferentially distributed around the movable shaft 5, and each movable support unit includes: A cylinder fixed arm 31, one end of which is fixed to the inner wall of the Venturi cylinder 1; A valve core restraint arm 32, one end of which is hinged to the fixed connecting member 41; A dynamic balance arm 33, one end of which is hinged to the sliding connecting member 42; The other end of the cylinder fixed arm 31, the other end of the valve core restraint arm 32, and the other end of the dynamic balance arm 33 are hinged to each other; By driving the axial movement of the movable shaft 5, the valve core assembly 2 can be axially moved along the movable shaft 5, thereby controlling the opening of the Venturi effect valve; when the valve core assembly 2 moves axially along the movable shaft 5, through the cooperation of the movable shaft 5 with the sliding connecting member 42 and the movable support unit, the radial displacement of the valve core assembly 2 is synchronously restricted, and the coaxiality between the valve core assembly 2 and the Venturi cylinder 1 is maintained, thereby realizing the precise control of the Venturi effect valve.

[0016] Specifically, please refer to Figure 2 and Figure 3 , the hinge between the valve core restraint arm 32 and the fixed connecting member 41, the hinge between the dynamic balance arm 33 and the sliding connecting member 42, and the hinges between the cylinder fixed arm 31, the valve core restraint arm 32, and the dynamic balance arm 33 are all realized through pin shafts; the axis of the pin shaft is perpendicular to the axial direction of the movable shaft 5 to allow each arm to freely rotate around the axis of the pin shaft.

[0017] Specifically, please refer to Figure 2 , there are three movable support units, and the three movable support units are circumferentially evenly distributed around the movable shaft 5, and the included angle between adjacent movable support units is 120°.

[0018] Specifically, there are four movable support units, and the four movable support units are circumferentially evenly distributed around the movable shaft 5, and the included angle between adjacent movable support units is 90°.

[0019] The present application also provides a high-precision Venturi effect flow control damper, and the high-precision Venturi effect flow control damper includes: the above-mentioned high-precision Venturi effect flow control support mechanism, a damping cylinder 61, an elastic component 62, a first end cover 63, a second end cover 64 and a piston 65. The damping cylinder 61 passes through the valve core of the valve core assembly 2, and the damping cylinder 61 is coaxially arranged with the valve core of the valve core assembly 2 and fixedly connected to the valve core of the valve core assembly 2. A first end cover 63 is fixedly arranged at the first end of the damping cylinder 61, a second end cover 64 is fixedly arranged at the second end of the damping cylinder 61, the piston 65 is arranged in the damping cylinder 61 and is slidably matched with the damping cylinder 61. The first end cover 63 is penetrated by the movable shaft 5 of the support mechanism, and the movable shaft 5 is fixedly connected to the piston 65. The elastic component 62 is arranged between the first end cover 63 and the piston 65. When the first end cover 63 moves relative to the piston 65, the elastic component 62 can limit the movement of the first end cover 63. The elastic component 62 can be a spring. The spring is sleeved on the movable shaft 5, and the first end cover 63 is fixedly connected to the piston 65 through the spring. When the valve core is abnormally stressed due to special situations such as sudden changes in fluid pressure, the valve core drives the first end cover 63 to move relative to the piston 65, and the spring can increase the resistance of the movement of the first end cover 63, thereby increasing the resistance of the movement of the valve core, slowing down the action speed of the valve core, and achieving the effects of absorbing kinetic energy, reducing impact force and vibration amplitude.

[0020] The present application also provides a high-precision Venturi effect flow control valve body, which includes: a Venturi cylinder 1, a valve core assembly 2, and a support mechanism. The valve core assembly 2 is movably connected to the Venturi cylinder 1 through the above-mentioned high-precision Venturi effect flow control support mechanism.

[0021] The adjustment of the air volume needs to be achieved through the regulating valve core assembly 2, and the adjustment of the valve core assembly 2 is achieved through the axial movement of the movable shaft 5; in order to ensure the accuracy of the air volume adjustment, the axial movement of the movable shaft 5 needs to be stable, and in particular, the radial movement of the movable shaft 5 needs to be avoided. When adjusting the valve core assembly 2, the fixed connecting piece 41 moves axially synchronously with the valve core assembly 2 and the movable shaft 5. The movable shaft 5 slides relative to the sliding connecting piece 42. The movable support unit can maintain the centering of the sliding connecting piece 42, and the sliding connecting piece 42 can limit the radial displacement of the movable shaft 5, thereby always ensuring the centering of the valve core assembly 2.

[0022] Please refer to Figure 4 and Figure 5 , Figure 4 which is a schematic diagram of the high-precision Venturi effect flow control damper of the present application provided on the valve core. Figure 5 which is a schematic diagram of a Venturi valve and a valve core assembly in the prior art. The pressure-independent control characteristic of the Venturi valve is achieved by the cooperation of the conical profile of the valve core assembly 2 and the specific contour of the inner wall of the Venturi cylinder 1; when the fluid pressure changes, the valve core assembly 2 moves axially along the movable shaft 5 under the combined action of the wind pressure and the damper, and dynamically adjusts the opening to maintain a constant flow rate; refer to Figure 5 , the traditional Venturi valve needs to adopt a double-bracket structure passing through the front and rear of the valve core to achieve the coaxiality of the valve core, resulting in two sliding friction pairs being formed between the valve core and the support shaft, significantly increasing the movement resistance; in the present application, through a single-sided integrated bracket mechanism, the rear end of the damper cylinder 61 of the damper can be closed-designed, and only a single-point sliding fit is achieved with the movable shaft 5 through the first end cover 63; thereby reducing the number of friction pairs from the traditional two points to a single point, and at the same time, the relatively closed space formed by closing the rear end of the damper cylinder 61 of the damper can generate an air cushion damping effect, further suppressing the vibration or deviation of the valve core assembly 2 during the dynamic adjustment process; the reduction of the frictional resistance and the enhancement of the damping effect jointly improve the response sensitivity and positioning accuracy of the valve core assembly 2 to pressure changes.

[0023] In summary, through the design of the movable support unit and the sliding connecting piece, etc., the present application solves the pain points of the traditional Venturi effect valve such as redundant length and insufficient centering, and has the advantages of high precision, compactness and low cost, and is applicable to high-requirement scenarios such as building heating ventilation and chemical fluid control.

[0024] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0025] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of this application and its equivalent technologies, this application is also intended to cover these modifications and variations.

Claims

1. A high-precision Venturi effect flow control bracket mechanism is disposed inside a Venturi cylinder and is used for the movable connection between a valve core assembly and the Venturi cylinder. It is characterized in that Comprising: A movable shaft, which is arranged along the axial direction of the Venturi tube body and is coaxial with the valve core assembly; A fixed connecting piece, which is fixedly arranged on the valve core assembly and is fixedly connected with one end of the movable shaft close to the valve core assembly; A sliding connecting piece, which is sleeved on the movable shaft and is in sliding fit with the movable shaft, and restricts the radial displacement of the movable shaft; At least three movable support units, which are circumferentially and uniformly distributed around the movable shaft. Each movable support unit comprises: A cylinder body fixed arm, one end of which is fixed to the inner wall of the Venturi tube body; A valve core restraint arm, one end of which is hinged to the fixed connecting piece; A dynamic balance arm, one end of which is hinged to the sliding connecting piece; The other ends of the cylinder body fixed arm, the valve core restraint arm and the dynamic balance arm are hinged to each other; When the valve core assembly moves axially along the movable shaft, through the cooperation of the movable shaft with the sliding connecting piece and the movable support unit, the radial displacement of the valve core assembly is synchronously restricted, and the coaxiality of the valve core assembly and the Venturi tube body is maintained.

2. The high-precision Venturi effect flow control bracket mechanism according to claim 1, wherein, The hinge connection between the valve core restraint arm and the fixed connecting piece, the hinge connection between the dynamic balance arm and the sliding connecting piece, and the hinge connections between the cylinder body fixed arm, the valve core restraint arm and the dynamic balance arm are all realized through a pin shaft; the axis of the pin shaft is perpendicular to the axial direction of the movable shaft.

3. The high-precision Venturi effect flow control bracket mechanism according to claim 1, wherein There are three movable support units, and the three movable support units are circumferentially and uniformly distributed with the movable shaft as the center, and the included angle between adjacent movable support units is 120°.

4. The high-precision Venturi effect flow control bracket mechanism according to claim 1, wherein There are four movable support units, and the four movable support units are circumferentially and uniformly distributed with the movable shaft as the center, and the included angle between adjacent movable support units is 90°.

5. High-precision Venturi effect flow control damper, characterized in that, Comprising: A damping cylinder, an elastic component, a first end cover, a second end cover, a piston, and a support mechanism according to any one of claims 1 to 4. The damping cylinder passes through the valve core of the valve core assembly, the damping cylinder is coaxially arranged with the valve core of the valve core assembly and is fixedly connected with the valve core of the valve core assembly. A first end cover is fixedly arranged at the first end of the damping cylinder, a second end cover is fixedly arranged at the second end of the damping cylinder, the piston is arranged in the damping cylinder and is in sliding fit with the damping cylinder, the first end cover is penetrated by the movable shaft of the support mechanism, the movable shaft is fixedly connected with the piston, and the elastic component is arranged between the first end cover and the piston. When the first end cover moves relative to the piston, the elastic component can restrict the movement of the first end cover.

6. The high-precision Venturi effect flow control damper according to claim 5, wherein, The elastic component is a spring, the spring is sleeved on the movable shaft, and the first end cover is fixedly connected with the piston through the spring.

7. High-precision Venturi effect flow control valve body, characterized in that Comprising: A Venturi tube body, a valve core assembly, and a support mechanism according to any one of claims 1 to 4. The valve core assembly is movably connected with the Venturi tube body through the support mechanism.

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