A dual spring balanced amplifier for a controller

Abstract

The utility model relates to a pneumatic equipment technical field especially is related to a double spring balance formula amplifier for controller, include: the inside opening of casing has working cavity, is equipped with signal air channel, output and input on the casing, signal air channel and working cavity top intercommunication, output and working cavity bottom intercommunication, input and working cavity bottom intercommunication, the upper diaphragm is arranged in the upper portion in working cavity, the valve seat is movably arranged in working cavity, the valve seat is located below the upper diaphragm, and the valve seat top surface and the upper diaphragm bottom surface contact, and the valve seat is equipped with valve cavity, the lower diaphragm is arranged in working cavity, and the lower diaphragm is connected with the valve seat, and the valve core is arranged in working cavity, and the valve core is equipped with the pressure relief hole that communicates with valve cavity, the pressure relief hole built-in valve core, can effectively balance the pressure inside and outside valve cavity, significantly suppresses and attenuates the oscillation phenomenon caused by pressure mutation in control process, makes output pressure more smooth and stable, greatly improves control precision.

Description

Technical Field

[0001] This utility model relates to the field of pneumatic equipment technology, and in particular to a dual-spring balanced amplifier for a controller. Background Technology

[0002] In the field of industrial automation control, pneumatic controllers are widely used for the precise real-time control of process parameters such as pressure and flow. Their core component—the pneumatic amplifier—is responsible for proportionally amplifying weak input control signals into output power signals, and its performance directly determines the accuracy and stability of the entire control system.

[0003] Traditional diaphragm pneumatic amplifiers typically employ a single-spring balanced structure. This type of structure has several inherent drawbacks: First, when the control signal (back pressure) changes, the diaphragm assembly's movement trajectory is singular, making it prone to skewness or jamming. This can lead to poor sealing between the valve core and seat, or delayed response, affecting control accuracy and potentially causing internal leakage. Second, during dynamic adjustment, the system is susceptible to oscillations due to pressure fluctuations, resulting in unstable output pressure and making smooth and precise control difficult. Furthermore, traditional amplifier structures are often complex, with numerous parts and cumbersome assembly processes, requiring high manufacturing precision. This not only increases manufacturing costs but also affects product consistency and reliability. Summary of the Invention

[0004] The technical problem to be solved by this utility model is: in order to overcome the problem that the system is prone to oscillation due to pressure fluctuations during dynamic adjustment in the prior art, resulting in unstable output pressure and difficulty in achieving smooth and precise control, a dual-spring balanced amplifier for controller is provided.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a dual-spring balanced amplifier for a controller, comprising: The housing has a working chamber inside, and a signal air passage, an output port, and an input port on the housing. The signal air passage is connected to the top of the working chamber, the output port is connected to the bottom of the working chamber, and the input port is connected to the bottom of the working chamber. The upper diaphragm is positioned in the upper part of the working chamber. The valve seat is movably arranged in the working chamber. The valve seat is located below the upper diaphragm, and the top surface of the valve seat is in contact with the bottom surface of the upper diaphragm. A valve chamber is opened on the valve seat. The lower diaphragm is located within the working chamber and is connected to the valve seat. The valve core is located in the working chamber. It is used to control the connection or disconnection between the input port and the output port. The valve core has a pressure relief hole that communicates with the valve chamber. The pressure relief hole built into the valve core can effectively balance the pressure inside and outside the valve chamber, significantly suppress and attenuate the oscillation phenomenon caused by pressure change during the control process, make the output pressure smoother and more stable, and greatly improve the control accuracy.

[0006] To address the issues of dividing the working chamber into chambers and connecting the gas paths, the system further includes an upper diaphragm and a lower diaphragm to divide the working chamber into an upper chamber, an intermediate chamber, and a lower chamber from top to bottom. The signal gas path connects to the upper chamber, the valve chamber connects to the intermediate chamber and the lower chamber, the pressure relief port connects to the valve chamber and the lower chamber, the output port connects to the lower chamber, and the input port connects to the lower chamber.

[0007] To address the issue of how to reliably reset the valve core after it has been activated, a reset spring is further included within the working chamber, with one end of the reset spring abutting against the valve core and the other end abutting against the housing.

[0008] To address the issues of supporting and resetting the valve seat and moving diaphragm components, the system further includes a support spring within the working chamber, with one end of the support spring abutting against the valve seat and the other end abutting against the housing.

[0009] To address the issues of bulky overall shell structure, difficult assembly of internal parts, and inconvenient maintenance, the shell is further comprised of a top cover and a base, which are connected by fastening bolts.

[0010] To address the issues of unstable fixing, easy displacement, or sealing failure of the upper and lower diaphragm edges, the system further includes a support member arranged within the working cavity. The support member is located between the upper and lower diaphragms and is used to fix the ends of the upper and lower diaphragms.

[0011] Further, the upper diaphragm edge is bent downward to form an upper sealing edge, and the support and housing clamp the upper sealing edge; The lower diaphragm edge is bent downward to form a lower sealing edge, and the support and housing clamp the lower sealing edge.

[0012] The beneficial effects of this utility model are: The dual-spring balanced amplifier for controller provided by this utility model has a built-in pressure relief hole in the valve core, which can effectively balance the pressure inside and outside the valve cavity, significantly suppress and attenuate the oscillation phenomenon caused by pressure change during the control process, make the output pressure smoother and more stable, and greatly improve the control accuracy. Attached Figure Description

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0014] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a utility model Figure 1 A magnified structural diagram of point A in the middle.

[0015] In the diagram: 1. Housing, 11. Working chamber, 111. Upper chamber, 112. Intermediate chamber, 113. Lower chamber, 12. Signal air passage, 13. Output port, 14. Input port, 15. Top cover, 16. Base, 2. Upper diaphragm, 3. Valve seat, 31. Valve chamber, 4. Lower diaphragm, 5. Valve core, 51. Pressure relief hole, 6. Return spring, 7. Support spring, 8. Support component. Detailed Implementation

[0016] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0017] like Figure 1 This is a schematic diagram of the structure of this utility model, a dual-spring balanced amplifier for controllers, comprising: The housing 1 has a working chamber 11 inside. The housing 1 has a signal air passage 12, an output port 13 and an input port 14. The signal air passage 12 is connected to the top of the working chamber 11, the output port 13 is connected to the bottom of the working chamber 11 and the input port 14 is connected to the bottom of the working chamber 11. Upper diaphragm 2, which is arranged in the upper part of the working chamber 11, Valve seat 3 is movably arranged in the working chamber 11. Valve seat 3 is located below the upper diaphragm 2, and the top surface of valve seat 3 is in contact with the bottom surface of the upper diaphragm 2. Valve seat 3 has a valve chamber 31. The lower diaphragm 4 is arranged inside the working chamber 11 and is connected to the valve seat 3. The valve core 5 is arranged in the working chamber 11. The valve core 5 is used to control the connection or disconnection between the input port 14 and the output port 13 and to block the valve chamber 31 of the valve seat 3. The valve core 5 is provided with a pressure relief hole 51 that communicates with the valve chamber 31. The pressure relief hole 51 built into the valve core 5 can effectively balance the pressure inside and outside the valve chamber 31, significantly suppress and attenuate the oscillation phenomenon caused by pressure change during the control process, make the output pressure smoother and more stable, and greatly improve the control accuracy. The diameter of the pressure relief hole 51 is 0.2mm.

[0018] The pressure relief hole 51 provides an extremely narrow channel for the valve chamber 31, allowing its pressure to "match" the output pressure, but not instantaneously. When the output pressure increases, a small stream of airflow slowly flows into the valve chamber 31 through the pressure relief hole 51. This airflow causes the pressure in the valve chamber 31 to rise slowly, attempting to catch up with the increase in output pressure. Because the pressure relief hole 51 is very small (φ0.2mm), the flow resistance is large, and this pressure balancing process is delayed and slow. Once the influence of the pressure difference is eliminated, the movement of the valve core is entirely determined by the force of the two return springs 6 and the support spring 7, as well as the signal pressure on the upper diaphragm 2.

[0019] The upper diaphragm 2 and the lower diaphragm 4 divide the working chamber 11 from top to bottom into an upper chamber 111, an intermediate chamber 112, and a lower chamber 113. The signal air passage 12 is connected to the upper chamber 111, the valve chamber 31 is connected to the intermediate chamber 112 and the lower chamber 113, the pressure relief port 51 is connected to the valve chamber 31 and the lower chamber 113, the output port 13 is connected to the lower chamber 113, and the input port 14 is connected to the lower chamber 113. The airflow path is clear, ensuring the logical correctness and efficiency of pressure sensing and action execution.

[0020] The working chamber 11 contains a return spring 6. One end of the return spring 6 abuts against the valve core 5, and the other end abuts against the housing 1. The return spring 6 provides an independent and stable restoring force for the valve core 5, ensuring the responsiveness and accuracy of the valve core 5's action, which is the key to realizing bidirectional control.

[0021] The working chamber 11 contains a support spring 7. One end of the support spring 7 abuts against the valve seat 3 and the other end abuts against the housing 1. The support spring provides support and initial position force for the entire valve seat 3 component, enabling it to respond sensitively to changes in air pressure in the upper chamber 111 and achieve smooth downward movement and reliable upward reset.

[0022] The dual-spring synergy design, with the return spring 6 and the support spring 7 working together, provides dual guidance for the movement of the valve seat 3 and the valve core 5, ensuring alignment and tight fit between the valve seat 3 and the upper diaphragm 2, and between the valve core 5 and the valve seat 3. This effectively avoids uneven wear and internal leakage, greatly improving the reliability of the seal and the service life of the product.

[0023] The housing 1 includes an upper cover 15 and a base 16, which are connected by fastening bolts. The split bolt connection structure decomposes the complex internal chambers and components into two modules, the upper cover 15 and the base 16, which greatly simplifies the assembly process and facilitates production and later maintenance. The phased smooth movement is achieved by first compressing the support spring 7 and then compressing the return spring 6. The entire movement is smooth and without jamming, and the response to changes in external signals is more linear and sensitive.

[0024] A support member 8 is arranged inside the working chamber 11. The support member 8 is located between the upper diaphragm 2 and the lower diaphragm 4. The support member 8 is used to fix the ends of the upper diaphragm 2 and the lower diaphragm 4. By using a common support member 8 and cooperating with the housing 1, the edges of the upper and lower diaphragms are fixed at the same time, ensuring the accuracy of the diaphragm position and the reliability of the seal. At the same time, the number of parts is reduced and the assembly process is optimized. The support member 8 has an overall ring structure.

[0025] The upper diaphragm 2 is bent downward at its edge to form an upper sealing edge 21, and the support member 8 and the housing 1 clamp the upper sealing edge; The lower diaphragm 4 is bent downward at its edge to form a lower sealing edge 41, and the support 8 and the housing 1 clamp the lower sealing edge 41.

[0026] Working process: In the initial state, when the control signal (air pressure input from signal airway 12) is weak or zero, the top surface of the lower valve seat 3 is tightly pressed against the upper diaphragm 2 under the elastic support of the support spring 7. At the same time, the upper sealing surface of the lower valve core 5 contacts the valve seat 3 under the elastic support of the return spring 6, separating the valve chamber 31 and the lower chamber 113. The valve core 5 blocks the input latch 14, separating the input port 14 from the output port 13.

[0027] When the control signal pressure increases, the signal air pressure 12 enters the upper chamber 111, acts on the upper diaphragm 2, and generates a downward thrust. This thrust overcomes the elastic force of the support spring 7, pushing the entire upper diaphragm 2, valve seat 3, and lower diaphragm 4 downward.

[0028] The thrust overcomes the elastic force of the support spring 7, pushing the entire upper diaphragm 2, valve seat 3, lower diaphragm 4, and valve core 5 downward. The valve core 5 remains in contact with the valve seat 3 under the action of the return spring 6. As the upper diaphragm 2 continues to move downward, the valve seat 3 stops moving and begins to push the valve core 5 downward to compress the return spring 6. The valve core 5 moves downward so that its lower sealing surface gradually opens the passage between the inlet port 14 and the outlet port 13. At the same time, the pressure relief hole 51 on the valve core 5 always maintains the pressure balance between the valve chamber 31 and the lower chamber 113.

[0029] When the control signal pressure decreases, the pressure in the upper chamber 111 decreases, and the restoring force of the support spring 7 and the return spring 6 pushes the valve seat 3 and the valve core 5 to move upward. The lower sealing surface of the valve core 5 gradually closes the channel between the input port 14 and the output port 13, and the output pressure decreases until it returns to the initial state.

[0030] The surface of the valve core 5 used to seal the inlet 14 is the lower sealing surface, and the surface of the valve core 5 used to seal the valve cavity 31 is the upper sealing surface.

[0031] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A dual-spring balanced amplifier for a controller, characterized by, include: The housing (1) has a working chamber (11) inside. The housing (1) has a signal air passage (12), an output port (13) and an input port (14). The signal air passage (12) is connected to the top of the working chamber (11), the output port (13) is connected to the bottom of the working chamber (11), and the input port (14) is connected to the bottom of the working chamber (11). The upper diaphragm (2) is arranged in the upper part of the working chamber (11). A valve seat (3) is movably arranged in the working chamber (11). The valve seat (3) is located below the upper diaphragm (2), and the top surface of the valve seat (3) is in contact with the bottom surface of the upper diaphragm (2). A valve chamber (31) is provided on the valve seat (3). A lower diaphragm (4) is arranged inside the working chamber (11), and the lower diaphragm (4) is connected to the valve seat (3). And valve core (5), which is elastically arranged in working chamber (11). The valve core (5) is used to control the connection or disconnection between input port (14) and output port (13) and to block valve chamber (31) of valve seat (3). The valve core (5) is provided with pressure relief hole (51) communicating with valve chamber (31). The upper diaphragm (2) and the lower diaphragm (4) divide the working chamber (11) from top to bottom into an upper chamber (111), an intermediate chamber (112) and a lower chamber (113). The signal air passage (12) is connected to the upper chamber (111). The valve chamber (31) is connected to the intermediate chamber (112) and the lower chamber (113). The pressure relief hole (51) is connected to the valve chamber (31) and the lower chamber (113). The output port (13) is connected to the lower chamber (113). The input port (14) is connected to the lower chamber (113).

2. The dual-spring balanced amplifier for a controller as described in claim 1, characterized in that: The working chamber (11) contains a reset spring (6), one end of which abuts against the valve core (5) and the other end against the housing (1).

3. The dual-spring balanced amplifier for a controller as described in claim 1, characterized in that: The working chamber (11) contains a support spring (7), one end of which abuts against the valve seat (3) and the other end against the housing (1).

4. A dual-spring balanced amplifier for a controller as described in claim 1, characterized in that: The housing (1) includes a top cover (15) and a base (16), which are connected by fastening bolts.

5. A dual-spring balanced amplifier for a controller as described in claim 1, characterized in that: A support member (8) is arranged inside the working chamber (11). The support member (8) is located between the upper diaphragm (2) and the lower diaphragm (4). The support member (8) is used to fix the end of the upper diaphragm (2) and the end of the lower diaphragm (4).

6. A dual-spring balanced amplifier for a controller as described in claim 5, characterized in that: The upper diaphragm (2) is bent downward at its edge to form an upper sealing edge (21), and the support (8) and the housing (1) clamp the upper sealing edge; The lower diaphragm (4) is bent downward at its edge to form a lower sealing edge (41), and the support (8) and the housing (1) clamp the lower sealing edge (41).

7. A dual-spring balanced amplifier for a controller as described in claim 1, characterized in that: The pressure relief hole (51) has a diameter of 0.2 mm.

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