Slide valve capable of realizing flow characteristics

Abstract

The application discloses a sliding plate regulating valve capable of realizing flow characteristics, which comprises a valve body, a valve inner cavity is formed in the valve body, a fixed sliding plate and a movable sliding plate which completely cover the cross section of the valve inner cavity and are parallel to each other are arranged in the valve inner cavity, a plurality of parallel and spaced rectangular movable sliding plate throttling grooves are formed on the movable sliding plate, the sliding direction of the movable sliding plate is the width direction of the movable sliding plate throttling grooves, a plurality of parallel and spaced fixed sliding plate throttling grooves are formed on the fixed sliding plate, the fixed sliding plate throttling grooves are parallel to the movable sliding plate throttling grooves, the spacing between adjacent movable sliding plate throttling grooves is greater than the width of the fixed sliding plate throttling grooves, and the spacing between adjacent fixed sliding plate throttling grooves is greater than the width of the movable sliding plate throttling grooves. The sliding plate regulating valve capable of realizing flow characteristics has reasonable structural design, realizes the flow characteristics of the regulating valve through the cooperation of the throttling grooves on the fixed sliding plate and the movable sliding plate, and has the advantages of simple processing, low cost and good application prospect.

Description

Technical Field

[0001] This invention relates to the field of control valve technology, and specifically to a slide plate control valve that can achieve flow characteristics, and more particularly to a slide plate control valve that can achieve various flow characteristics through a two-dimensional design of the slide plate. Background Technology

[0002] A control valve is a device used in industrial automation process control to regulate process parameters such as flow rate, pressure, temperature, and liquid level of a medium. Based on control signals from the automation system, the valve automatically adjusts its opening to regulate these parameters.

[0003] Flow characteristics are an important technical indicator and parameter of control valves. They describe the relationship between the relative flow rate and the relative stroke of the valve stem, and are a factor that must be considered when designing and selecting control valves. Currently, there are three main types of flow characteristics for control valves: quick-opening, linear, and equal percentage flow characteristics. Quick-opening flow characteristics: The relative flow rate increases rapidly during the initial period of the relative stroke. Linear flow characteristics: The relative flow rate has a linear relationship with the relative stroke of the valve stem. Equal percentage (logarithmic) flow characteristics: At each point in the stroke, the change in flow rate caused by a unit change in stroke is proportional to the flow rate at that point. This characteristic results in small flow rate changes at low flow rates and large flow rate changes at high flow rates, exhibiting good regulating performance and adaptability.

[0004] Achieving accurate flow characteristics is a crucial factor to consider when designing control valves, such as conventional linear control valves. Figure 1 As shown, its valve seat throttling orifice is circular, and the valve core is plunger-type. When the stroke changes, the position of the valve core changes, and the relative flow energy passing through the throttling area changes, i.e., the area of ​​the valve seat minus the area of ​​the valve core. Since the area of ​​the valve seat remains constant, the corresponding flow characteristics are mainly achieved through the shape design of the valve core. The different valve core shapes corresponding to quick-opening, linear, and equal percentage flow characteristics are shown below. Figures 2-4 As shown, especially for equal percentage flow characteristics, the valve core has an irregular shape and is difficult to process.

[0005] Therefore, developing a control valve that is easy to manufacture and inexpensive and can achieve flow characteristics is of great practical significance. Summary of the Invention

[0006] Due to the aforementioned deficiencies in the existing technology, the present invention provides a control valve that is easy to process and low in cost, capable of achieving flow characteristics. Specifically, it is a slide plate control valve that can achieve various flow characteristics through a two-dimensional design of a slide plate, which solves the defects of existing control valves that achieve flow characteristics, such as irregular valve core shapes and difficulty in processing.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A slide plate regulating valve capable of achieving flow characteristics, comprising a valve body;

[0009] The valve body has an internal cavity, and a fixed slide plate and a movable slide plate that completely cover the cross-section of the valve cavity are installed inside the internal cavity. The fixed slide plate and the movable slide plate are parallel to each other, and the movable slide plate is connected to the movable slide plate drive rod.

[0010] The movable slide plate has multiple parallel and spaced throttling grooves. The sliding direction of the movable slide plate is the width direction of the throttling grooves. The throttling grooves are elongated.

[0011] The fixed slide plate has multiple parallel and spaced throttling grooves. The arrangement direction of the fixed slide plate throttling grooves is parallel to the arrangement direction of the moving slide plate throttling grooves. The distance between adjacent moving slide plate throttling grooves is greater than the width of the fixed slide plate throttling grooves, and the distance between adjacent fixed slide plate throttling grooves is greater than the width of the moving slide plate throttling grooves.

[0012] The present invention relates to a sliding plate regulating valve capable of achieving flow characteristics. It features a rational structural design, achieving the regulating valve's flow characteristics through the cooperation of throttling grooves on the fixed and moving sliding plates. As the moving sliding plate moves up and down with the drive rod, the throttling area changes, thereby achieving precise regulation of the medium flow rate. The design transforms a three-dimensional shape into a two-dimensional planar slot shape. Accurate flow characteristics can be obtained simply by completing the shape design / processing of the throttling groove. The manufacturing process is simple and inexpensive. Different flow characteristics can be achieved by designing different shapes of the throttling grooves on the fixed sliding plate, indicating promising application prospects.

[0013] As a preferred technical solution:

[0014] As described above, in a sliding plate regulating valve capable of achieving flow characteristics, the movable sliding plate drive rod is driven by a valve drive device.

[0015] As described above, in a sliding plate regulating valve that can achieve flow characteristics, if the throttling slot of the fixed sliding plate is rectangular, then the change in stroke and the change in throttling area are linearly related to the change in stroke, so the flow characteristics of the valve are linear flow characteristics.

[0016] As described above, a sliding plate regulating valve that can achieve flow characteristics has an irregular shape in the fixed sliding plate throttling slot that matches the equal percentage flow characteristics. When the stroke just begins to change, the flow rate changes little, and when the stroke reaches its maximum, the flow rate changes greatly, exhibiting an equal percentage change. Therefore, the valve's flow characteristics are equal percentage flow characteristics.

[0017] As described above, a sliding plate regulating valve capable of achieving flow characteristics includes a fixed sliding plate throttling slot orifice comprising an upper rectangular orifice, an upper isosceles trapezoidal orifice, a middle rectangular orifice, a lower isosceles trapezoidal orifice, and a lower oblong orifice that are coaxial and connected in sequence.

[0018] The lower long side of the upper rectangular hole connects to the upper base of the upper isosceles trapezoidal hole; the lower base of the upper isosceles trapezoidal hole connects to the upper long side of the middle rectangular hole; the lower long side of the middle rectangular hole connects to the upper base of the lower isosceles trapezoidal hole; the lower base of the lower isosceles trapezoidal hole connects to the upper long side of the lower oblong hole; the length of the upper rectangular hole is equal to the length of the upper base of the upper isosceles trapezoidal hole; the length of the lower base of the upper isosceles trapezoidal hole is greater than the length of the upper base of the upper isosceles trapezoidal hole; the length of the middle rectangular hole is equal to the length of the upper base of the lower isosceles trapezoidal hole; the length of the lower base of the lower isosceles trapezoidal hole is greater than the length of the upper base of the lower isosceles trapezoidal hole; and the length of the lower oblong hole is greater than the length of the lower base of the lower isosceles trapezoidal hole.

[0019] As described above, a sliding plate regulating valve that can achieve flow characteristics has a fixed sliding plate throttling groove that matches a moving sliding plate throttling groove.

[0020] As described above, a sliding plate regulating valve that can achieve flow characteristics has multiple fixed plate throttling grooves on the fixed plate that are the same in shape but different in size, with the size of the fixed plate throttling grooves on the fixed plate being larger in the middle and smaller on both sides;

[0021] The multiple throttling grooves on the moving slide plate have the same shape but different sizes, with the size of the throttling grooves on the moving slide plate being larger in the middle and smaller on both sides.

[0022] The above technical solution is only one feasible technical solution of the present invention. The scope of protection of the present invention is not limited thereto. Those skilled in the art can reasonably adjust the specific design according to actual needs.

[0023] The above invention has the following advantages or beneficial effects:

[0024] (1) The slide plate regulating valve of the present invention can realize the flow characteristics. It has a reasonable structural design. The flow characteristics of the regulating valve are realized by the cooperation of the fixed slide plate and the throttling groove on the moving slide plate. During the up and down movement of the moving slide plate following the moving slide plate drive rod, the throttling area changes, thereby realizing the precise regulation of the medium flow rate.

[0025] (2) The slide plate regulating valve of the present invention can realize flow characteristics. It transforms the three-dimensional shape design into a two-dimensional planar slot shape design. Accurate flow characteristics can be obtained by completing the shape design / processing of the throttling groove. The processing is simple and the cost is low. Different flow characteristics can be achieved by different designs of the shape of the fixed slide plate throttling groove. It has good application prospects. Attached Figure Description

[0026] The invention, its features, shape, and advantages will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings. Like reference numerals denote like parts throughout the drawings. The drawings are not drawn to scale; their focus is on illustrating the gist of the invention.

[0027] Figure 1 This is a cross-sectional schematic diagram of a control valve in the prior art;

[0028] Figures 2-4 These are schematic diagrams of quick-opening valve cores, linear valve cores, and equal percentage valve cores, respectively.

[0029] Figure 5 This is a cross-sectional view of the slide plate regulating valve of the present invention, which enables flow characteristics;

[0030] Figure 6 This is a top view of the fixed sliding plate in Example 1;

[0031] Figure 7 This is a top view of the fixed sliding plate in Example 2;

[0032] Figure 8 for Figure 7 A schematic diagram of the fixed slide plate throttling groove in the design;

[0033] Wherein, 1 is the fixed slide plate, 11 is the fixed slide plate throttling groove, 111 is the upper rectangular hole, 112 is the upper isosceles trapezoidal hole, 113 is the middle rectangular hole, 114 is the lower isosceles trapezoidal hole, 115 is the lower oblong hole, 2 is the moving slide plate, 3 is the moving slide plate drive rod, 4 is the valve inner cavity, 5 is the valve core, 6 is the valve core drive rod, and 7 is the valve body. Detailed Implementation

[0034] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but these are not intended to limit the scope of the invention.

[0035] Existing control valves such as Figure 1 As shown, the valve cavity 4 inside the valve body 7 is provided with a circular valve seat throttling hole, where a plunger-type valve core 5 is installed. The valve core 5 is driven by the valve core drive rod 6. When the stroke changes, the position of the valve core changes, and the throttling area through which the relative flow energy passes changes.

[0036] Its specific method is as follows Figures 2-4 The quick-opening valve core, linear valve core, and equal percentage valve core shown can achieve the quick-opening, linear, and equal percentage flow characteristics of the regulating valve.

[0037] Example 1

[0038] A sliding plate control valve that can achieve linear flow characteristics, such as Figure 5 As shown, it includes valve body 7;

[0039] The valve body 7 has an internal valve cavity. A fixed slide plate 1 and a movable slide plate 2 that completely cover the cross section of the valve cavity are installed inside the valve cavity. The fixed slide plate 1 and the movable slide plate 2 are parallel to each other. The movable slide plate 2 is connected to the movable slide plate drive rod 3, which is driven by the valve drive device.

[0040] The movable slide plate 2 has three parallel and spaced throttling grooves. The sliding direction of the movable slide plate 2 is the width direction of the throttling grooves. The throttling grooves are long strips (rectangular). The three throttling grooves have the same shape but different sizes. The throttling grooves on the movable slide plate 2 are larger in the middle and smaller on both sides.

[0041] like Figure 6 As shown, three parallel and spaced throttling grooves 11 are opened on the fixed slide plate 1. The throttling groove holes of the fixed slide plate are rectangular and match the throttling grooves of the moving slide plate. The three throttling grooves 11 on the fixed slide plate 1 have the same shape but different sizes. The throttling grooves 11 on the fixed slide plate 1 are larger in the middle and smaller on both sides. The arrangement direction of the throttling grooves 11 is parallel to the arrangement direction of the moving slide plate throttling grooves. The distance between adjacent moving slide plate throttling grooves is greater than the width of the fixed slide plate throttling groove 11, and the distance between adjacent fixed slide plate throttling grooves 11 is greater than the width of the moving slide plate throttling groove.

[0042] Example 2

[0043] A sliding plate regulating valve capable of achieving equal percentage flow characteristics is basically the same as that in Embodiment 1, except for the shape of the fixed sliding plate throttling groove orifice, which is as follows: Figures 7-8 As shown, it is an irregular shape that matches the equal percentage flow characteristics, including an upper rectangular hole 111, an upper isosceles trapezoidal hole 112, a middle rectangular hole 113, a lower isosceles trapezoidal hole 114 and a lower oblong hole 115 that are coaxial and connected in sequence.

[0044] The lower long side of the upper rectangular hole 111 is connected to the upper base of the upper isosceles trapezoidal hole 112. The lower base of the upper isosceles trapezoidal hole 112 is connected to the upper long side of the middle rectangular hole 113. The lower long side of the middle rectangular hole 113 is connected to the upper base of the lower isosceles trapezoidal hole 114. The lower base of the lower isosceles trapezoidal hole 114 is connected to the upper long side of the lower oblong hole 115. The length of the upper rectangular hole 111 is equal to the length of the upper base of the upper isosceles trapezoidal hole 112. The length of the lower base of the upper isosceles trapezoidal hole 112 is greater than the length of the upper base of the upper isosceles trapezoidal hole 112. The length of the middle rectangular hole 113 is equal to the length of the upper base of the lower isosceles trapezoidal hole 114. The length of the lower base of the lower isosceles trapezoidal hole 114 is greater than the length of the upper base of the lower isosceles trapezoidal hole 114. The length of the lower oblong hole 115 is greater than the length of the lower base of the lower isosceles trapezoidal hole 114.

[0045] Specifically, the applicant has designed and manufactured more than 100 slide valve products with more than 20 calibers similar to those in Example 1 or 2, tested them, and applied them to the precise regulation of various gas, liquid, and steam media. After testing, it was found that Examples 1 and 2 can accurately achieve linear flow characteristics and equal percentage flow characteristics.

[0046] Verification has shown that the slide plate regulating valve of this invention, capable of achieving flow characteristics, has a reasonable structural design. The flow characteristics of the regulating valve are achieved through the cooperation of the throttling grooves on the fixed slide plate and the moving slide plate. As the moving slide plate moves up and down with the moving slide plate drive rod, the throttling area changes, thereby achieving precise regulation of the medium flow rate. The three-dimensional shape design is transformed into a two-dimensional planar slot shape design. Accurate flow characteristics can be obtained by completing the shape design / processing of the throttling groove. The processing is simple and low-cost. Different flow characteristics can be achieved by designing different shapes of the throttling grooves on the fixed slide plate, showing good application prospects.

[0047] Those skilled in the art should understand that variations can be implemented by combining existing technology with the above embodiments, which will not be elaborated here. Such variations do not affect the essence of the present invention, and will not be elaborated here either.

[0048] The preferred embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and the devices and structures not described in detail should be understood as being implemented in a conventional manner in the art. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention using the methods and techniques disclosed above, or modify them into equivalent embodiments with equivalent changes, without departing from the scope of the present invention. This does not affect the essential content of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the present invention's technical solutions still fall within the protection scope of the present invention.

Claims

1. A slide gate regulating valve capable of achieving flow characteristics, characterized in that, Including the valve body; The valve body has an internal cavity, and a fixed slide plate and a movable slide plate that completely cover the cross-section of the valve cavity are installed inside the internal cavity. The fixed slide plate and the movable slide plate are parallel to each other, and the movable slide plate is connected to the movable slide plate drive rod. The movable slide plate has multiple parallel and spaced throttling grooves. The sliding direction of the movable slide plate is the width direction of the throttling grooves. The throttling grooves are elongated. The fixed slide plate has multiple parallel and spaced throttling grooves. The arrangement direction of the fixed slide plate throttling grooves is parallel to the arrangement direction of the moving slide plate throttling grooves. The distance between adjacent moving slide plate throttling grooves is greater than the width of the fixed slide plate throttling grooves. The throttling slot of the fixed slide plate is an irregular shape to match the equal percentage flow characteristics; The fixed slide plate throttling slot includes an upper rectangular hole, an upper isosceles trapezoidal hole, a middle rectangular hole, a lower isosceles trapezoidal hole, and a lower oblong hole that are coaxial and connected in sequence. The lower long side of the upper rectangular hole is connected to the upper base of the upper isosceles trapezoidal hole; the lower base of the upper isosceles trapezoidal hole is connected to the upper long side of the middle rectangular hole; the lower long side of the middle rectangular hole is connected to the upper base of the lower isosceles trapezoidal hole; the lower base of the lower isosceles trapezoidal hole is connected to the upper long side of the lower oblong hole; the length of the upper rectangular hole is equal to the length of the upper base of the upper isosceles trapezoidal hole; the length of the lower base of the upper isosceles trapezoidal hole is greater than the length of the upper base of the upper isosceles trapezoidal hole; the length of the middle rectangular hole is equal to the length of the upper base of the lower isosceles trapezoidal hole; the length of the lower base of the lower isosceles trapezoidal hole is greater than the length of the upper base of the lower isosceles trapezoidal hole; the length of the lower oblong hole is greater than the length of the lower base of the lower isosceles trapezoidal hole. The fixed slide plate throttling groove is matched with the moving slide plate throttling groove.

2. A slide gate regulating valve capable of achieving flow characteristics according to claim 1, characterized in that, The movable slide plate drive rod is driven by a valve drive device.

3. A slide gate regulating valve capable of achieving flow characteristics according to claim 1, characterized in that, The multiple throttling grooves on the fixed slide plate have the same shape but different sizes, with the size of the throttling grooves on the fixed slide plate being larger in the middle and smaller on both sides; The multiple throttling grooves on the moving slide plate have the same shape but different sizes, with the size of the throttling grooves on the moving slide plate being larger in the middle and smaller on both sides.

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