Electrical proportional two-element control valve

Abstract

The utility model relates to an electrical proportional double -core regulating valve, include: valve body, main air passage, actuating mechanism, wherein, the actuating mechanism includes: diaphragm assembly, pressure chamber, by setting in the upper diaphragm cover and lower diaphragm cover of valve body top and diaphragm assembly common enclosure together, electrical proportional valve interface, spring adjusting mechanism, set up in the upper diaphragm cover upper portion, for the diaphragm assembly applies the initial pressure downward, valve core subassembly, including coaxial arrangement big valve core and small valve core, the upper end of small valve core is connected with diaphragm plug, and the lower end is inserted into main air passage, and the head of small valve core is conical structure, big valve core is set in small valve core outside. Through the coordinated work design of unique size two valve cores, small valve core is responsible for the fine adjustment when small flow, and big valve core is responsible for the on-off when big flow, effectively expands the adjustment range, can satisfy to the complicated situation of both high accuracy and wide range requirement to flow control.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, specifically to an electrical proportional dual-core regulating valve. Background Technology

[0002] In many fields such as industrial automation, process control, and fluid transmission, high-precision pneumatic pressure or flow regulation is crucial. Traditional control valves typically employ a single valve core design, which has a limited regulation ratio. These valves often fall short when dealing with applications requiring precise control of a wide range of flow rates: they struggle to achieve fine and stable regulation under low flow conditions, while failing to meet flow capacity requirements under high flow conditions.

[0003] To overcome the limitations of a single valve core's adjustment capability, electro-proportional valves have emerged as a technological advancement. These are electronic pressure-reducing valves that continuously and proportionally control gas pressure or flow rate via electrical signals. Their working principle typically involves receiving command signals from a controller (either through the balance of internal electromagnetic and mechanical forces, or through a closed-loop control system formed by feedback from a built-in pressure sensor) to drive the valve core, thereby precisely controlling the output secondary pressure or flow rate.

[0004] Although electro-proportional valves offer significant improvements in control accuracy and response speed compared to traditional electro-converters, many conventional electro-proportional valves are still based on a single-spool design. This single-spool design inherently struggles to simultaneously achieve high-resolution, high-precision control at extremely low flow rates and full flow capacity at high flow rates. To achieve a wider control ratio and more linear control characteristics across the entire range, an innovative valve design is urgently needed. Utility Model Content

[0005] The purpose of this invention is to provide an electro-proportional dual-core regulating valve to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an electro-proportional dual-core regulating valve, comprising: The valve body, a main vent passage disposed within the valve body, and an actuator for adjusting the opening degree of the main vent passage, wherein the actuator includes: A diaphragm assembly, the diaphragm assembly comprising a diaphragm and a diaphragm plug fixed at the center of the diaphragm; The pressure chamber is formed by the upper diaphragm cover and the lower diaphragm cover located above the valve body, together with the diaphragm assembly; An electric proportional valve interface is provided on the lower diaphragm cover for connecting an external air supply element to introduce control air pressure into the pressure chamber; A spring adjustment mechanism is provided on the upper part of the upper diaphragm cover for applying a downward initial pressure to the diaphragm assembly; The valve core assembly includes a large valve core and a small valve core arranged coaxially. The upper end of the small valve core is connected to the diaphragm plug, and the lower end extends into the main air passage. The head of the small valve core has a conical structure. The large valve core is sleeved outside the small valve core.

[0007] Optionally, the diaphragm assembly also includes a metal liner disposed inside the diaphragm.

[0008] Optionally, the spring adjustment mechanism includes an adjustment screw, an upper spring seat, and a spring. The top of the spring is connected to the upper spring seat, and the bottom is connected to the upper diaphragm cover. The adjustment screw abuts against the upper spring seat to adjust the compression of the spring.

[0009] Optionally, the upper end of the small valve core is fixedly connected to the diaphragm plug by a locking nut.

[0010] Optionally, the small valve core is provided with a linkage structure on its head, which is used to drive the large valve core to move upward synchronously.

[0011] Optionally, the linkage structure uses screws.

[0012] Compared with the prior art, the beneficial effects of this utility model are: Through a unique design that allows two valve cores of different sizes to work together, the smaller valve core is responsible for fine adjustment at low flow rates, while the larger valve core is responsible for on / off switching at high flow rates, effectively increasing the adjustment range and meeting the needs of complex applications requiring both high precision and a wide range of flow control. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model.

[0014] Figure 2 This is a schematic diagram of the small valve core structure of this utility model. Detailed Implementation

[0015] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description is provided in conjunction with the accompanying drawings and preferred embodiments, based on the specific implementation methods, structure, features and effects of this utility model.

[0016] like Figure 1 and Figure 2 As shown, an electro-proportional dual-core regulating valve includes a valve body 8, a main air passage disposed within the valve body 8, and an actuator for adjusting the opening degree of the main air passage. The actuator comprises: A diaphragm assembly, comprising a diaphragm 5 and a diaphragm plug 6 fixed in the center of the diaphragm, wherein a metal liner (such as a steel plate) is provided inside the diaphragm to enhance the pressure-bearing capacity of the diaphragm. The pressure chamber is formed by the upper diaphragm cover 2 and the lower diaphragm cover (7) located above the valve body and the diaphragm assembly together; An electric proportional valve interface A is provided on the lower diaphragm cover 7 for connecting an external air supply element to introduce control air pressure into the pressure chamber; A spring adjustment mechanism is disposed on the upper part of the upper diaphragm cover 2 and is used to apply a downward initial pressure to the diaphragm assembly. It includes an adjustment screw 1, an upper spring seat 3 and a spring 4. The top of the spring 4 is connected to the upper spring seat 3 and the bottom is connected to the upper diaphragm cover 2. The adjustment screw 1 abuts against the upper spring seat 3 and is used to adjust the compression of the spring 4.

[0017] The valve core assembly includes a large valve core 9 and a small valve core 10 coaxially arranged. The upper end of the small valve core 10 is connected to the diaphragm plug 6, and the lower end extends into the main air passage. The head of the small valve core has a conical structure. The large valve core 9 is sleeved on the outside of the small valve core 10. The upper end of the small valve core 10 is fixedly connected to the diaphragm plug 6 by a locking nut 12. In order to enable the large valve core to move in conjunction with the small valve core, a screw 11 is installed on the head of the small valve core. When the screw contacts the large valve core, the upward movement of the small valve core is transmitted to the large valve core through the screw, so that the large valve core moves under the drive of the small valve core.

[0018] The working process of this utility model is described below: 1. Initially, the spring is compressed by manually rotating the adjusting screw, and the spring applies a downward initial force through the upper spring seat. This force is transmitted to the entire diaphragm assembly through the upper diaphragm cover. This downward spring force ultimately acts on the small valve core connected to the lower end of the diaphragm plug, causing it to close or be at an initial opening. At this time, if there is no control signal, the valve is in the closed state under the action of the spring force.

[0019] 2. When the external control system sends an electrical signal, the external air supply component (such as an electro-proportional valve ITV) connected to it starts to work.

[0020] The electro-proportional valve (ITV) proportionally converts the electrical signal into a precise control air pressure (e.g., 0-0.5 MPa). This control air pressure enters the pressure chamber formed by the upper and lower diaphragm covers and the diaphragm assembly through air passage A on the lower diaphragm cover.

[0021] The controlled air pressure acts on the lower surface of the diaphragm, generating an upward force (F). 气 = Air pressure × Effective diaphragm area). At this point, the diaphragm assembly becomes a "force comparator," and its movement depends on the downward force of the spring (F). 弹 ) and the upward force of air pressure (F) 气 The game between them: When F 气 < F 弹 At this time, the diaphragm assembly moves downward, driving the valve core to close slightly or remain closed; When F 气 > F 弹 At that time, the diaphragm assembly moves upward against the spring force; When F 气 = F 弹 At that time, the diaphragm assembly is in a precise equilibrium position.

[0022] 3. The coordinated working process of the dual valve cores Phase 1: Fine-tuning with low flow rate (high-precision phase) As the electrical signal gradually increases from zero, the resulting control air pressure is also relatively low. The diaphragm assembly then drives the low-flow valve core to move upwards.

[0023] The precision conical surface of the small valve core head gradually separates from the valve body, opening a tiny annular gap. Because the gap area is small and the valve core stroke is precisely proportional to the air pressure (electrical signal), it is possible to perform very precise linear regulation of extremely small flow rates.

[0024] During this stage, the high-flow valve core remains stationary, while the low-flow valve core independently controls the flow rate. This enables high-precision regulation of the valve under low-flow conditions.

[0025] Phase Two: High-Volume Activation and Transition (High-Capacity Phase) As the electrical signal intensifies, the control air pressure increases, causing the diaphragm assembly to drive the small-flow valve core upwards. When the small valve core rises to a certain stroke, the screw fixed to it will press against and "lift" the large-flow valve core.

[0026] At this point, the large-flow valve core begins to move upward along with the small valve core, opening the main channel. A large amount of fluid can then pass through the larger flow channel area formed by the large valve core and the valve body.

[0027] Subsequently, the valve flow rate is controlled by both valve cores, entering the high flow range. The movement of the larger valve core is also proportional to the electrical signal, ensuring precise proportional control across the entire flow range.

[0028] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the content of the present utility model's technical solution shall still fall within the scope of the present utility model's technical solution.

Claims

1. An electro-proportional dual-core regulating valve, comprising a valve body (8), a main air passage disposed within the valve body (8), and an actuator for adjusting the opening degree of the main air passage, characterized in that, The implementing mechanism includes: A diaphragm assembly, the diaphragm assembly including a diaphragm (5) and a diaphragm plug (6) fixed to the center of the diaphragm. The pressure chamber is formed by the upper diaphragm cover (2) and the lower diaphragm cover (7) located above the valve body, together with the diaphragm assembly; An electric proportional valve interface (A) is provided on the lower diaphragm cover (7) for connecting an external air supply element to introduce control air pressure into the pressure chamber; A spring adjustment mechanism is provided on the upper part of the upper diaphragm cover (2) for applying a downward initial pressure to the diaphragm assembly; The valve core assembly includes a large valve core (9) and a small valve core (10) arranged coaxially. The upper end of the small valve core (10) is connected to the diaphragm plug (6), and the lower end extends into the main air passage. The head of the small valve core (10) has a conical structure. The large valve core (9) is sleeved on the outside of the small valve core (10).

2. The electro-proportional dual-core regulating valve according to claim 1, characterized in that, The diaphragm assembly also includes a metal liner disposed inside the diaphragm (5).

3. The electro-proportional dual-core regulating valve according to claim 1, characterized in that, The spring adjustment mechanism includes an adjustment screw (1), an upper spring seat (3) and a spring (4). The top of the spring (4) is connected to the upper spring seat (3) and the bottom is connected to the upper diaphragm cover (2). The adjustment screw (1) abuts against the upper spring seat (3) to adjust the compression of the spring (4).

4. The electro-proportional dual-core regulating valve according to claim 1, characterized in that, The upper end of the small valve core (10) is fixedly connected to the diaphragm plug (6) by a locking nut (12).

5. The electro-proportional dual-core regulating valve according to claim 1, characterized in that, The small valve core (10) has a linkage structure on its head, which is used to drive the large valve core (9) to move upward synchronously.

6. The electro-proportional dual-core regulating valve according to claim 5, characterized in that, The linkage structure uses screws (11).

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