A large flow torque motor type servo pressure regulating valve with variable feedback coefficient

Abstract

This invention discloses a high-flow-rate torque motor-type variable feedback coefficient servo pressure regulating valve, comprising a pipe section, a pilot valve, a main valve body, a servo control component, a connecting rod assembly, and a butterfly plate. The butterfly plate is adapted to the pipe section, and the pilot valve, main valve body, and servo control component are sequentially arranged on the pipe section according to the flow direction of the medium within the pipe section. The main valve body includes a main valve housing, within which a piston assembly is adapted. The piston assembly is connected to the inner wall of the main valve housing chamber via a diaphragm, and a diaphragm spring is connected between the piston assembly and the bottom of the main valve housing chamber. When the piston assembly actuates, it drives the butterfly plate to actuate via the connecting rod assembly. This invention is applicable to high-pressure, high-flow-rate gas environments. By controlling the feedback ratio of the feedback gas path through a finite-angle torque motor, and under dynamic balance between the feedback pressure and the control reference pressure, servo regulation of the outlet pressure within a certain pressure range is achieved.

Description

Technical Field

[0001] This invention relates to the field of pressure regulating valve technology, specifically to a high-flow torque motor type variable feedback coefficient servo pressure regulating valve. Background Technology

[0002] Pipelines are crucial equipment for transporting media. To reduce the gas source pressure to the pressure required for downstream equipment, the medium within the pipeline needs to be depressurized or regulated. Pressure regulating valves are widely used as pipeline pressure regulating accessories. In existing technology, pilot-operated automatic control pressure regulating valves change the opening of the main valve by altering the fluid's outlet pressure, thereby changing the main valve's throttling resistance and maintaining a relatively constant outlet pressure. Pilot-operated automatic control pressure regulating valves generally consist of a main valve and a pilot valve. The pilot valve provides a reference pressure, allowing the main valve to reach a balance under the action of the reference pressure and feedback pressure, thus regulating the outlet pressure to a certain value without significant fluctuations. However, this method of regulating with a fixed outlet pressure value cannot effectively cope with changes in downstream demand pressure.

[0003] Patent CN201636405U discloses a leak-free servo-controlled pressure regulating valve, which includes a main valve and a pilot valve. The main valve includes a main valve body, a main valve seat, and a main valve core. A balance chamber is provided between the main valve and the pilot valve, and a pressure relief chamber is provided in the pilot valve. The balance chamber is connected to the medium inlet of the main valve and the medium inlet of the pilot valve, respectively. The pressure relief chamber is connected to the medium outlet of the main valve. The main valve core is a cone shape with a smaller bottom and a larger top, and faces the medium flow direction and is opposite to the medium channel of the main valve seat. It can change the opening degree of the valve core when there are pressure fluctuations before and after the valve to ensure a smooth transition of system pressure. However, for some special occasions, it is necessary to ensure that the outlet pressure can be adjusted within a certain range to meet special application conditions. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the existing defects and provide a high-flow torque motor type variable feedback coefficient servo pressure regulating valve, which is suitable for high-pressure and high-flow gas environments. By controlling the feedback ratio of the feedback gas path through a finite angle torque motor, and under the dynamic balance between the feedback pressure and the control reference pressure, the outlet pressure can be servo-regulated within a certain pressure range, which can effectively solve the problems in the background technology.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a high-flow torque motor type variable feedback coefficient servo pressure regulating valve, comprising a pipe section, a pilot valve, a main valve body, a servo control component, a connecting rod assembly, and a butterfly plate; the butterfly plate is adapted to the pipe section, and the pilot valve, the main valve body, and the servo control component are arranged sequentially on the pipe section according to the flow direction of the medium within the pipe section;

[0006] The main valve body includes a cover and a main valve housing connected by screws. The cover and the main valve housing form a cavity. The cover is provided with an air inlet. A piston assembly is adapted inside the main valve housing. The piston assembly is connected to the inner wall of the main valve housing cavity by a diaphragm. A diaphragm spring is also connected between the piston assembly and the main valve housing cavity. When the piston assembly moves, it drives the butterfly plate to move through the connecting rod assembly.

[0007] The servo control component includes a servo housing, a pipe communicating with its inner cavity, a baffle in the inner cavity of the servo housing, the baffle correspondingly blocking the small hole communicating with the pipe, a driving device for driving the baffle to swing on the outer wall of the servo housing, and a discharge hole communicating with its inner cavity.

[0008] The pilot valve's medium inlet is connected to the pipe section, and the pilot valve's medium outlet is connected to the left chamber of the piston assembly; the servo control assembly's pipeline is a tee pipe, which is connected to the pipe section, the servo housing chamber, and the right chamber of the piston assembly, respectively.

[0009] Preferably, the pilot valve includes a pilot valve housing with a flow channel. A valve adapted within the pilot valve housing to adjust the clearance of the medium passing through the flow channel is provided. The upper part of the valve extends into the pilot valve housing cavity and has a pilot valve diaphragm assembly at its upper end. The diaphragm of the pilot valve diaphragm assembly is connected to the inner wall of the pilot valve housing cavity. An adjusting bolt is threadedly connected to the upper part of the pilot valve housing. The lower end of the adjusting bolt extends into the pilot valve housing cavity and is connected to the pilot valve diaphragm assembly via a pilot valve spring. The pilot valve housing has a discharge hole communicating with the upper cavity of the pilot valve diaphragm assembly. The pilot valve housing also has a return channel communicating with the flow channel and the lower cavity of the pilot valve diaphragm assembly, and the return channel has a damping orifice.

[0010] Preferably, the servo housing is threaded with an adjusting screw, which extends into the inner cavity of the servo housing and is fitted with an adjusting spring. One end of the adjusting spring abuts against a baffle.

[0011] Preferably, the connecting rod assembly includes a long straight rod, one end of which is hinged to the piston assembly, and the other end of which is connected to the disc plate via a rocker arm. The piston assembly, the long straight rod, and the rocker arm form a connecting rod structure that converts the linear motion of the piston assembly into the rotation of the disc plate.

[0012] Preferably, the driving device is a finite angle torque motor, which is connected to an external power source via an electrical connector.

[0013] Preferably, the pipe wall near the pipe section has damping holes.

[0014] Compared with existing technologies, the advantages of this invention are as follows: Inlet pressure enters the pilot valve, and the pilot valve diaphragm assembly dynamically balances under the action of the pilot valve spring force, the pilot valve outlet pressure, and atmospheric pressure. Adjusting the pilot valve opening stabilizes the pilot valve outlet pressure. Adjusting the position of the adjusting bolt adjusts the pilot valve spring force, thereby adjusting the pilot valve outlet pressure. The piston assembly dynamically balances under the action of the pilot valve outlet pressure, feedback pressure, and the diaphragm spring. Adjusting the butterfly plate opening via the connecting rod assembly adjusts the pilot valve outlet pressure, or adjusting the rotation angle of the finite angle torque motor in the servo control assembly adjusts the feedback chamber venting volume, resulting in corresponding changes in the outlet pressure. This invention is suitable for high-pressure, high-flow-rate gas environments. By controlling the feedback ratio of the feedback gas path through the finite angle torque motor, and under the dynamic balance between the feedback pressure and the control reference pressure, servo regulation of the outlet pressure within a certain pressure range is achieved. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention;

[0016] Figure 2 This is a schematic diagram of the pilot valve structure of the present invention;

[0017] Figure 3 This is a schematic diagram of the main valve body structure of the present invention;

[0018] Figure 4 This is a schematic diagram of the servo control component structure of the present invention;

[0019] Figure 5 This is a partial structural diagram of the servo control component of the present invention.

[0020] In the picture:

[0021] 1 pipe section;

[0022] 2. Pilot valve; 2.1 Adjusting bolt; 2.2 Pilot valve housing; 2.3 Pilot valve diaphragm assembly; 2.4 Valve; 2.5 Flow passage; 2.6 Return passage; 2.7 Pilot valve spring;

[0023] 3. Main valve body, 3.1 Cover, 3.2 Air inlet, 3.3 Diaphragm, 3.4 Piston assembly, 3.5 Diaphragm spring, 3.6 Main valve housing;

[0024] 4 Servo control components, 4.1 Servo housing, 4.2 Piping, 4.3 Adjusting spring, 4.4 Adjusting screw, 4.5 Baffle, 4.6 Drive unit, 4.7 Damping hole;

[0025] 5-link assembly, 5.1 vertical link, 5.2 swing arm;

[0026] 6. Butterfly board. Detailed Implementation

[0027] The technical solution of the present invention will now be described with reference to the accompanying drawings of the embodiments of the present invention. In the description, it should be understood that the terms "upper," "lower," "front," "rear," "left," and "right," etc., indicating directions or positional relationships, are only used to correspond to the accompanying drawings of the present invention for the purpose of facilitating the description of the present invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation.

[0028] Please see Figure 1-5 The present invention provides a technical solution: a high flow rate torque motor type variable feedback coefficient servo pressure regulating valve, including a pipe section 1, a pilot valve 2, a main valve body 3, a servo control component 4, a connecting rod assembly 5, and a butterfly plate 6; the butterfly plate 6 is adapted to the pipe section 1, and the pilot valve 2, the main valve body 3, and the servo control component 4 are arranged on the pipe section 1 in sequence according to the flow direction of the medium in the pipe section 1.

[0029] The medium inlet of the pilot valve 2 is connected to the pipe section 1, and the medium outlet of the pilot valve 2 is connected to the upper chamber of the piston assembly 3.4 of the main valve housing 3.1; the pipe 4.2 of the servo control component 4 is a three-way pipe, which is connected to the pipe section 1, the chamber of the servo housing 4.1 and the lower chamber of the piston assembly 3.4 of the main valve housing 3.1 respectively.

[0030] like Figure 3 As shown, the main valve body 3 includes a cover 3.1 and a main valve housing 3.6 connected by screws. The cover 3.1 and the main valve housing 3.6 form a chamber. The cover 3.1 is provided with an air inlet 3.2. A piston assembly 3.4 is adapted inside the main valve housing 3.6. The piston assembly 3.4 is connected to the inner wall of the main valve housing 3.6 chamber by a diaphragm 3.3. A diaphragm spring 3.5 is also connected between the piston assembly 3.4 and the main valve housing 3.6 chamber. When the piston assembly 3.4 moves, it drives the butterfly plate 6 to move through the connecting rod assembly 5. The piston assembly 3.4 of the main valve body 3 is dynamically balanced under the action of the pilot valve 2 outlet pressure, feedback pressure and diaphragm spring 3.5. When the pilot valve 2 outlet pressure increases, the pressure on the left side of the piston assembly 3.4 is greater than the pressure on the right side, causing the piston assembly 3.4 to move to the right, thereby adjusting the opening of the butterfly plate 6 through the connecting rod assembly 5.

[0031] like Figure 4 As shown, the servo control component 4 includes a servo housing 4.1. The servo housing 4.1 is provided with a pipe 4.2 communicating with its inner cavity. The inner cavity of the servo housing 4.1 is provided with a baffle 4.5, which blocks the small hole communicating with the pipe 4.2. The outer wall of the servo housing 4.1 is provided with a driving device 4.6 for driving the baffle 4.5 to swing. The servo housing 4.1 is also provided with a discharge hole communicating with its inner cavity. The driving device 4.6 drives the baffle 4.5 to move, which can control the amount of air released. When the baffle 4.5 blocks the small hole, no air is released. At this time, the outlet pressure value of the pipe 1 is equal to the feedback pressure.

[0032] The medium inlet of pilot valve 2 is connected to pipe section 1, and the medium outlet of pilot valve 2 is connected to the left chamber of piston assembly 3.4; the pipe 4.2 of servo control assembly 4 is a three-way pipe, which is connected to pipe section 1, servo housing 4.1 chamber and right chamber of piston assembly 3.4 respectively.

[0033] It is understandable that the piston assembly 3.4 of the main valve body 3 is dynamically balanced under the action of the outlet pressure of the pilot valve 2, the feedback pressure, and the diaphragm spring 3.5, so as to achieve a stable outlet pressure value. This outlet pressure value of pipeline 1 is called the base pressure value. In this state, adjusting the outlet pressure of the pilot valve 2 can adjust the base pressure value of the structural outlet pressure. When the baffle 4.5 is fully open, the air release is the largest, the pressure drop of the outlet pressure of pipeline 1 through the damping orifice 4.7 is the largest, and the pressure in the feedback chamber decreases. At this time, the feedback pressure / outlet pressure value of pipeline 1 (feedback coefficient) becomes smaller, the piston assembly 3.4 moves to the right, the opening of the butterfly plate 6 increases, and the outlet pressure value of pipeline 1 increases. Similarly, when the baffle 4.5 partially blocks the small hole, the air release is the second largest, and the opening of the butterfly plate 6 increases accordingly. By controlling the swing angle of the baffle 4.5 through the drive device 4.6, the feedback pressure / outlet pressure value of pipeline 1 (feedback coefficient) changes, thereby changing the outlet pressure of pipeline 1 when the piston is in balance, and realizing the servo adjustment of the outlet pressure based on a certain pressure value range.

[0034] It should be noted that the drive device 4.6 is a finite angle torque motor. The finite angle torque motor is connected to an external power supply through an electrical connector. The finite angle torque motor can achieve servo adjustment of the outlet pressure within a certain range.

[0035] like Figure 3 As shown, the pilot valve 2 includes a pilot valve housing 2.2, which has a flow channel 2.5. A valve 2.4, capable of adjusting the gap through which the medium passes in the flow channel 2.5, is fitted inside the pilot valve housing 2.2. The upper part of the valve 2.4 extends into the chamber of the pilot valve housing 2.2, and a pilot valve diaphragm assembly 2.3 is provided at its upper end. The diaphragm of the pilot valve diaphragm assembly 2.3 is connected to the inner wall of the chamber of the pilot valve housing 2.2. An adjusting bolt 2.1 is threadedly connected to the upper part of the pilot valve housing 2.2. The lower end of the adjusting bolt 2.1 extends into the chamber of the pilot valve housing 2.2, and its lower end is connected to the pilot valve diaphragm assembly 2.3 via a pilot valve spring 2.7. The pilot valve housing 2.2 has a discharge hole communicating with the upper chamber of the pilot valve diaphragm assembly 2.3. The pilot valve housing 2.2 also has a return channel 2.6 communicating with the flow channel 2.5 and the lower chamber of the pilot valve diaphragm assembly 2.3.

[0036] It is understandable that the upper pressure of the pilot valve diaphragm assembly 2.3 is the spring force of the pilot valve spring 2.7 and atmospheric pressure, and the lower pressure of the pilot valve diaphragm assembly 2.3 is the pilot valve outlet pressure (pressure inside the flow channel 2.5). The pilot valve diaphragm assembly 2.3 is dynamically balanced under the action of the spring force of the pilot valve spring 2.7, the pilot valve outlet pressure (pressure inside the flow channel 2.5), and atmospheric pressure to achieve stability of the pilot valve outlet pressure. The spring force of the pilot valve spring 2.7 can be adjusted by adjusting the adjusting bolt 2.1, thereby adjusting the pilot valve outlet pressure value.

[0037] In addition, the return channel 2.6 has a damping orifice, which reduces the frequency of pressure fluctuations at the pilot valve outlet due to changes in inlet pressure, thereby slowing down the medium flow rate and reducing the flow rate, thus playing a damping role.

[0038] Furthermore, the servo housing 4.1 is also threadedly connected to an adjusting screw 4.4. The adjusting screw 4.4 extends into the inner cavity of the servo housing 4.1 and is fitted with an adjusting spring 4.3. One end of the adjusting spring 4.3 abuts against the baffle 4.5. The adjusting spring 4.3 can be adjusted by adjusting the adjusting screw 4.4, thereby adjusting the starting current of the limited angle torque motor baffle movement.

[0039] Furthermore, the connecting rod assembly 5 includes a long straight rod 5.1, one end of which is hinged to the piston assembly 3.4, and the other end of which is connected to the disc plate 6 via a rocker arm 5.2. The piston assembly 3.4, the long straight rod 5.1, and the rocker arm 5.2 form a connecting rod structure, which converts the linear motion of the piston assembly 3.4 into the rotation of the disc plate 6. That is, when the piston assembly 3.4 moves, it drives the disc plate 6 to move through the connecting rod assembly 5.

[0040] The parts of this invention not described in detail are prior art. It will be apparent to those skilled in the art that this invention is not limited to the details of the above exemplary embodiments, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the above embodiments should be regarded as exemplary and non-limiting in all respects. The scope of this invention is defined by the appended claims rather than the foregoing description. Therefore, it is intended to include all changes that fall within the meaning and scope of the equivalents of the claims within this invention, and no reference numerals in the claims should be regarded as limiting the content of the claims.

Claims

1. A high-flow-rate torque motor type variable feedback coefficient servo pressure regulating valve, characterized in that: It includes a pipe section (1), a pilot valve (2), a main valve body (3), a servo control component (4), a connecting rod assembly (5), and a butterfly plate (6); the butterfly plate (6) is adapted to the pipe section (1), and the pilot valve (2), the main valve body (3), and the servo control component (4) are arranged on the pipe section (1) in sequence according to the flow direction of the medium in the pipe section (1); The main valve body (3) includes a cover (3.1) and a main valve housing (3.6) connected by screws. The cover (3.1) and the main valve housing (3.6) form a chamber. The cover (3.1) is provided with an air inlet (3.2). A piston assembly (3.4) is adapted inside the main valve housing (3.6). The piston assembly (3.4) is connected to the inner wall of the main valve housing (3.6) chamber through a diaphragm (3.3). A diaphragm spring (3.5) is also connected between the piston assembly (3.4) and the main valve housing (3.6) chamber. When the piston assembly (3.4) moves, it drives the butterfly plate (6) to move through the connecting rod assembly (5). The servo control component (4) includes a servo housing (4.1), which is provided with a pipe (4.2) communicating with its inner cavity. The inner cavity of the servo housing (4.1) is provided with a baffle (4.5), which blocks the small hole communicating with the pipe (4.2). The outer wall of the servo housing (4.1) is provided with a driving device (4.6) for driving the baffle (4.5) to swing. The servo housing (4.1) is also provided with a discharge hole communicating with its inner cavity. The medium inlet of the pilot valve (2) is connected to the pipe section (1), and the medium outlet of the pilot valve (2) is connected to the left chamber of the piston assembly (3.4); the pipeline (4.2) of the servo control assembly (4) is a three-way pipe, which is connected to the pipe section (1), the servo housing (4.1) chamber and the right chamber of the piston assembly (3.4) respectively.

2. The high-flow torque motor type variable feedback coefficient servo pressure regulating valve according to claim 1, characterized in that: The pilot valve (2) includes a pilot valve housing (2.2), which has a flow channel (2.5). A valve (2.4) is fitted inside the pilot valve housing (2.2) to regulate the passage of the medium through the flow channel (2.5). The upper part of the valve (2.4) extends into the chamber of the pilot valve housing (2.2) and has a pilot valve diaphragm assembly (2.3) at its upper end. The diaphragm of the pilot valve diaphragm assembly (2.3) is connected to the inner wall of the chamber of the pilot valve housing (2.2). The upper part of the pilot valve housing (2.2)... The system is threaded with an adjusting bolt (2.1), the lower end of which extends into the chamber of the pilot valve housing (2.2) and is connected to the pilot valve diaphragm assembly (2.3) via a pilot valve spring (2.7). The pilot valve housing (2.2) is provided with a discharge hole that communicates with the upper chamber of the pilot valve diaphragm assembly (2.3). The pilot valve housing (2.2) is also provided with a return channel (2.6) that communicates with the flow channel (2.5) and the lower chamber of the pilot valve diaphragm assembly (2.3). The return channel (2.6) has a damping hole.

3. The high-flow torque motor type variable feedback coefficient servo pressure regulating valve according to claim 1, characterized in that: The servo housing (4.1) is threaded with an adjusting screw (4.4). The adjusting screw (4.4) extends into the inner cavity of the servo housing (4.1) and is fitted with an adjusting spring (4.3). One end of the adjusting spring (4.3) abuts against the baffle (4.5).

4. The high-flow torque motor type variable feedback coefficient servo pressure regulating valve according to claim 1, characterized in that: The connecting rod assembly (5) includes a long straight rod (5.1), one end of which is hinged to the piston assembly (3.4), and the other end of which is connected to the butterfly plate (6) via a rocker arm (5.2). The piston assembly (3.4), the long straight rod (5.1), and the rocker arm (5.2) form a connecting rod structure, which converts the linear motion of the piston assembly (3.4) into the rotation of the butterfly plate (6).

5. The high-flow torque motor type variable feedback coefficient servo pressure regulating valve according to claim 1, characterized in that: The drive device (4.6) is a finite angle torque motor, which is connected to an external power source via an electrical connector.

6. The high-flow torque motor type variable feedback coefficient servo pressure regulating valve according to claim 1, characterized in that: The pipe (4.2) has a damping hole (4.7) on the pipe wall near the pipe section (1).

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