Voltage regulation structure of variable loading voltage regulator

Abstract

The present invention relates to a pressure regulating structure of a variable loading type pressure regulator, which is arranged in a gas pressure regulator, wherein a pressure regulator diaphragm is provided in the gas pressure regulator, including a pressure differential elastic airbag, wherein the pressure differential elastic airbag is installed on the pressure regulator diaphragm; a pilot valve, wherein the pilot valve and the pressure differential elastic airbag are connected via a gas guide signal tube; wherein the pressure differential elastic airbag is a circle of completely sealed closed circular ring, and the interior of the pressure differential elastic airbag is an elastic airbag cavity D; a pilot valve air inlet A is provided on the pilot valve, wherein the pilot valve includes a pilot valve body, wherein a piston is provided in the pilot valve body, and the gas guide signal tube is connected to the pilot valve body and the on and off of the gas guide signal tube is controlled by the position of the piston. The present invention is a self-powered variable loading structure that does not require external force, and has an adaptive adjustment function, and is safe and reliable through the loading method of the differential pressure airbag, and the control method of the differential pressure pilot valve and the airbag, and has good control performance, provides the most suitable loading area, and has high adjustment accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of voltage regulators, in particular to the technical field of voltage regulating structures of variable loading voltage regulators. Background Art

[0002] The gas pressure regulator is a device used to adjust the pipeline pressure in the gas transmission and distribution system and is widely used on gas transmission pipelines. The main pressure-sensing element of the gas pressure regulator is a rubber diaphragm. When the gas pressure of natural gas acts on the surface of the rubber mold, the air pressure will obtain the area of ​​the diaphragm and thus convert the pressure into thrust. According to the relationship between force and pressure: force = pressure x force area (pressure is the gas pressure value of natural gas). The thrust obtained by the diaphragm and the air pressure is the core power of the pressure regulator. It has three different loading states when driving the pressure regulator: 1. The state of driving the pressure regulator to open; 2. The state of driving the pressure regulator to adjust; 3. The state of driving the pressure regulator to close.

[0003] The thrust values ​​required for these three states vary according to needs. Since the force-bearing area of ​​the diaphragm of the pressure regulator in the prior art is a fixed value, when the thrust decreases, the gas pressure value of the natural gas will inevitably decrease; and when the thrust increases, the gas pressure value of the natural gas will inevitably increase. This makes the gas pressure value of the natural gas after the pressure regulator unstable. The width of this unstable range is a key factor affecting the regulation accuracy and closing accuracy of the pressure regulator.

[0004] Therefore, the fixed diaphragm loading area used in the prior art cannot provide stable air pressure values ​​for the three states of fully open, closed and regulating process to ensure the regulation accuracy. Summary of the invention

[0005] The purpose of the present invention is to solve the problems in the prior art and propose a pressure regulating structure of a variable loading type pressure regulator, which is a self-powered variable loading structure that does not require external force and has an adaptive adjustment function. It is safe and reliable, has good control performance, provides the most suitable loading area, and has high adjustment accuracy through the loading method of the differential pressure airbag and the control method of the differential pressure pilot valve and the airbag.

[0006] In order to overcome the problems existing in the prior art, the present invention provides the following technical solutions:

[0007] The pressure regulating structure of the variable loading type pressure regulator is arranged in the gas pressure regulator, and the gas pressure regulator is provided with a pressure regulating diaphragm, including

[0008] A pressure differential elastic airbag, wherein the pressure differential elastic airbag is installed on the pressure regulator diaphragm;

[0009] A pilot valve, wherein the pilot valve is connected to the pressure differential elastic airbag via an air guide signal tube;

[0010] Among them, the pressure difference elastic airbag is a circle of completely sealed closed circular ring, and the inside of the pressure difference elastic airbag is an elastic airbag cavity D; the pilot valve is provided with a pilot valve air inlet A, the pilot valve includes a pilot valve body, a piston is arranged in the pilot valve body, the air guide signal tube is connected to the pilot valve body and the on and off of the air guide signal tube is controlled by the position of the piston.

[0011] In the pressure regulating structure of the variable loading type pressure regulator disclosed in the present application, optionally, the pilot valve includes a pilot valve diaphragm cover, the pilot valve diaphragm cover is connected to the pilot valve body, a pilot valve diaphragm is provided inside the pilot valve diaphragm cover, and the pilot valve diaphragm cooperates with the piston rod.

[0012] In the pressure regulating structure of the variable loading type pressure regulator disclosed in the present application, optionally, a pilot valve spring is also installed in the pilot valve diaphragm cover, and the pilot valve spring is sleeved on the piston rod and pressed on the pilot valve diaphragm.

[0013] In the pressure regulating structure of the variable load type pressure regulator disclosed in the present application, optionally, one end of the pilot valve diaphragm cover is connected to the pilot valve body, and the other end opening of the pilot valve diaphragm cover is connected to the pilot valve air inlet A, and a pilot valve loading chamber is formed between the pilot valve diaphragm and the opening of the pilot valve diaphragm cover, and the opening of the pilot valve diaphragm cover is the loading chamber air inlet A.

[0014] In the pressure regulating structure of the variable load type pressure regulator disclosed in the present application, optionally, the connection between the air guide signal tube and the pilot valve body is a first air vent C of the signal tube and a second air vent C of the signal tube, and the first air vent C of the signal tube and the second air vent C of the signal tube are arranged in parallel and both lead to the pilot valve body.

[0015] In the pressure regulating structure of the variable loading type pressure regulator disclosed in the present application, optionally, a pilot valve channel is further provided between the pilot valve body and the pilot valve air inlet A, the pilot valve channel bypasses the pilot valve loading chamber, the pilot valve channel opening is the pilot valve channel vent B, and the pilot valve channel vent B corresponds to the position of the first vent C of the signal tube.

[0016] In the voltage regulating structure of the variable loading voltage regulator disclosed in the present application, optionally, a pilot valve vent A is further provided on the pilot valve body, and the pilot valve vent A corresponds to the position of the second vent C of the signal tube.

[0017] In the voltage regulating structure of the variable loading voltage regulator disclosed in the present application, optionally, the voltage regulator diaphragm is pressurized and convex, and a differential pressure elastic airbag is installed on the outer circumference of the convexity of the voltage regulator diaphragm, and the differential pressure elastic airbag is made of rubber material.

[0018] The beneficial effects of the present invention are:

[0019] The present invention designs a variable loading structure, which is a self-powered variable loading structure that does not require external force and has an adaptive adjustment function. By designing the loading method of the differential pressure airbag and the control method of the differential pressure pilot valve and the airbag, the air pressure thrust balance in different working states can be adjusted so that the three key performance indicators of closing accuracy, pressure regulating section accuracy, and opening limit all reach a consistent level of excellence, are safe and reliable, have good control performance, provide the most suitable loading area, have high adjustment accuracy, and break the performance bottleneck of the prior art.

[0020] The features and advantages of the present invention will be described in detail through embodiments in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a schematic diagram of the structure of the closed state of the voltage regulator of the prior art;

[0023] Figure 2 It is a schematic diagram of the regulation state structure of the voltage regulator in the prior art;

[0024] Figure 3 It is a schematic diagram of the structure of the fully open state of the voltage regulator in the prior art.

[0025] Figure 4 It is the overall structural diagram of the voltage regulating structure of the variable loading type voltage regulator;

[0026] Figure 5 yes Figure 4 An enlarged structural diagram of the center pilot valve;

[0027] Figure 6 It is a schematic diagram of the closed state structure of the voltage regulating structure of the variable loading type voltage regulator;

[0028] Figure 7 It is a schematic diagram of the regulating state structure of the voltage regulating structure of the variable loading type voltage regulator;

[0029] Figure 8 It is a schematic diagram of the fully open state structure of the voltage regulating structure of the variable loading type voltage regulator.

[0030] In the figure

[0031] 1- diaphragm cover; 2- regulator diaphragm; 3- spring; 4- valve port pad; 5- valve stem; 6- differential pressure elastic airbag; 7- air guide signal tube; 8- pilot valve; 81- pilot valve body; 82- piston; 83- pilot valve spring; 84- pilot valve diaphragm cover; 85- pilot valve loading chamber; 86- pilot valve diaphragm; 87- pilot valve channel; A- pilot valve air inlet; A1- loading chamber air inlet; A2- pilot valve vent; B- pilot valve channel vent; C1- first vent of signal tube; C2- second vent of signal tube; D- elastic airbag chamber; P2- air pressure after regulator; H- spring pressure height. DETAILED DESCRIPTION

[0032] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0033] In the description of the embodiments of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0034] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0035] The disclosure below provides many different embodiments or examples to realize different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention application embodiment can repeat reference numbers or reference letters in different examples, and this repetition is only for the purpose of simplification and clarity, and itself does not indicate the relationship between the various embodiments discussed or / and settings.

[0036] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0037] As Figure 1 , Figure 2 , Figure 3 , the pressure regulator of the prior art includes a diaphragm cover 1, a pressure regulator diaphragm 2 is arranged inside the diaphragm cover 1, a spring chamber is installed on the diaphragm cover 1, a spring 3 is arranged inside the spring chamber, and the spring 3 presses on the pressure regulator diaphragm 2. A valve stem 5 is arranged inside the pressure regulator, and a movable valve matching the valve stem 5 is arranged on the pressure regulator diaphragm 2; a valve port is arranged at the place leading to the movable valve, and a valve port gasket 4 is matched with the valve port for sealing.

[0038] Figure 1-Figure 3 Respectively shown are the closed, adjusted, and fully open states of the pressure regulator.

[0039] Among them, for the spring compression height H, by comparing Figure 1 , Figure 2 , Figure 3 the pressure regulator in the closed, adjusted, and fully open states respectively, it can be clearly seen that the heights of the pressure regulator spring 3 in the three states are different, H1 < H2 < H3. Therefore, in the three states, the relationship of the spring force values of the pressure regulator is: closed > pressure regulation > fully open.

[0040] The pressure regulator diaphragm 2 is the intermediate interface of the force relationship. Above the pressure regulator diaphragm 2 is the downward spring force, and below the diaphragm is the upward air pressure thrust. The two need to reach equilibrium in the three states of the pressure regulator, that is, regardless of whether the pressure regulator is in the closed, adjusted, or fully open state, the spring force and the air pressure thrust should be equal. Note: The air pressure thrust below the diaphragm = the air pressure value behind the pressure regulator × the force-bearing area of the diaphragm.

[0041] However, since the compression amounts of the spring 3 in the three states are different, the spring loading forces are actually different. Because the force-bearing area of the pressure regulator diaphragm 2 remains unchanged, the air pressure thrust below the pressure regulator diaphragm 2 is a fixed value. Therefore, there is actually a situation of unbalanced force in the three states. This unbalanced force leads to the inability to achieve the same excellent degree for the three key performance indicators of the closing accuracy, pressure regulation accuracy, and opening limit of the pressure regulator. For example, if the closed state is designed such that the spring force = the air pressure thrust, better closing accuracy can be obtained, but the adjustment accuracy and opening limit will be affected accordingly due to the unbalanced force relationship; conversely, if the fully open state is designed such that the spring force = the air pressure thrust, better opening limit can be obtained, but the closing accuracy and adjustment accuracy will be affected accordingly due to the unbalanced force relationship. This is a typical physical principle and also a defect existing in the structure of the pressure regulator of the prior art.

[0042] In order to make the closed, adjusted, and fully open states all achieve the same excellent performance, it is necessary to solve the problem that the force-bearing area of the diaphragm remains unchanged.

[0043] As Figure 4 , Figure 5The present invention provides a pressure regulating structure of a variable loading type pressure regulator, which is arranged in a gas pressure regulator, and a pressure regulator diaphragm 2 is arranged in the gas pressure regulator, including

[0044] A pressure differential elastic airbag 6, wherein the pressure differential elastic airbag 6 is installed on the pressure regulator diaphragm 2;

[0045] A pilot valve 8, wherein the pilot valve 8 is connected to the pressure difference elastic airbag 6 via a pilot signal pipe 7;

[0046] Among them, the pressure difference elastic airbag 6 is a completely sealed closed ring, which is hollow inside, and the inside of the pressure difference elastic airbag 6 is an elastic airbag cavity D; the pressure regulator diaphragm 2 is convex under pressure, and the pressure difference elastic airbag 6 is installed on the convex outer circumference of the pressure regulator diaphragm 2, and the pressure difference elastic airbag 6 is made of rubber material.

[0047] The pilot valve 8 is provided with a pilot valve air inlet A, and the pilot valve 8 includes a pilot valve body 81, and a piston 82 is arranged in the pilot valve body 81. The pilot air signal pipe 7 is connected to the pilot valve body 81 and the on-off of the pilot air signal pipe 7 is controlled by the position of the piston 82. The air pressure P2 after the pressure regulator is connected through the pilot valve air inlet A;

[0048] Figure 4 , Figure 5 The middle pilot valve controls the action of the piston 82 by comparing the pressure difference between the regulated air pressure P2 connected to the A port and the set value of the pilot valve spring 83, and the piston 82 controls the on and off of the A2, B, C1, and C2 interfaces to achieve differential pressure control.

[0049] The pilot valve 8 comprises a pilot valve membrane cover 84 , which is connected to the pilot valve body 81 . A pilot valve diaphragm 86 is arranged inside the pilot valve membrane cover 84 , and the pilot valve diaphragm 86 cooperates with the piston 82 rod.

[0050] A pilot valve spring 83 is also installed in the pilot valve diaphragm cover 84 . The pilot valve spring 83 is sleeved on the piston 82 rod and pressed on the pilot valve diaphragm 86 .

[0051] One end of the pilot valve membrane cover 84 is connected to the pilot valve body 81, and the other end of the pilot valve membrane cover 84 is connected to the pilot valve air inlet A. A pilot valve loading chamber 85 is formed between the pilot valve diaphragm 86 and the opening of the pilot valve membrane cover 84, and the opening of the pilot valve membrane cover 84 is the loading chamber air inlet A1.

[0052] The connection between the air guide signal tube 7 and the pilot valve body 81 is a first air vent C1 of the signal tube and a second air vent C2 of the signal tube. The first air vent C1 of the signal tube and the second air vent C2 of the signal tube are arranged in parallel and both lead to the pilot valve body 81 .

[0053] A pilot valve channel 87 is further provided between the pilot valve body 81 and the pilot valve air inlet A. The pilot valve channel 87 bypasses the pilot valve loading chamber 85. The opening of the pilot valve channel 87 is a pilot valve channel vent B, which corresponds to the first vent C1 of the signal tube.

[0054] The pilot valve body 81 is also provided with a pilot valve vent A2, and the pilot valve vent A2 corresponds to the position of the second vent C2 of the signal tube.

[0055] like Figure 6 , Figure 7 , Figure 8 , three working states of the variable loading structure in the three states of the voltage regulator:

[0056] 1. Regulator off state

[0057] When the voltage regulator is closed, the height of the voltage regulator spring 3 is the smallest, and the spring force is the largest. In order to achieve rapid balance, the air pressure thrust of the voltage regulator diaphragm 2 needs to be increased.

[0058] When the pressure regulator is about to be closed, the increase in spring force will cause the air pressure behind the pressure regulator to increase accordingly. The air pressure enters the pilot valve loading chamber 85 through the A1 port. Since the air pressure is high, the pilot valve spring force is not enough to counteract the air pressure, so the air pressure pushes the pilot valve diaphragm 86 to move to the left in the figure, thereby driving the piston 82 to move to the left. At this time, the A2-C2 port is open and the B-C1 port is closed. The air pressure cannot enter the airbag through the B-C1 port. At the same time, the original air pressure of the elastic airbag cavity D is discharged outward through the C2-A2 channel, resulting in a decrease in the air pressure in the elastic airbag cavity D. The pressure difference elastic airbag 6 shrinks outward to increase the space outside the circumference of the membrane protrusion. Under the action of the air pressure below the pressure regulator diaphragm 2, the outer diameter of the protruding part of the pressure regulator diaphragm 2 increases, so the force area of ​​the pressure regulator diaphragm 2 increases accordingly, so as to achieve the effect of increasing the air pressure thrust of the pressure regulator diaphragm 2, and quickly reach a balance with the increased pressure regulator spring force, so that the pressure regulator quickly reaches a closed state, and the performance of closing accuracy is improved.

[0059] 2. Voltage regulator adjustment status

[0060] When the pressure regulator is in the adjustment state, the piston 82 is in the middle position and can sensitively monitor the introduced air pressure. When the adjustment state tends to the valve opening direction, the height of the pressure regulator spring 3 increases slightly, resulting in a slight decrease in the pressure regulator spring force, and the piston 82 moves to the right. According to the actual differential pressure, the B-C1 port is slightly opened, and the air pressure in the elastic airbag cavity D is appropriately increased, so as to achieve a slight reduction in the force area of ​​the pressure regulator diaphragm 2, thereby quickly allowing the force relationship of the valve opening during the adjustment process to reach a balanced state, so as to improve the adjustment performance; conversely, when the adjustment state tends to the valve closing direction, the height of the pressure regulator spring 3 decreases slightly, resulting in a slight increase in the pressure regulator spring force, and the piston 82 moves to the left. According to the actual differential pressure, the C2-A2 port is slightly opened, and the air pressure in the elastic airbag cavity D is appropriately reduced, so as to achieve a slight increase in the force area of ​​the pressure regulator diaphragm 2, thereby quickly allowing the force relationship of the valve closing during the adjustment process to reach a balanced state, so as to improve the adjustment performance.

[0061] 3. Voltage regulator fully open

[0062] When the voltage regulator is fully opened, since the height of the voltage regulator spring 3 is the highest, the spring force is the smallest. In order to quickly balance the air pressure thrust of the voltage regulator diaphragm 2 with the spring force at this time to achieve excellent full-open performance, it is necessary to reduce the air pressure thrust at the diaphragm accordingly.

[0063] When the pressure regulator is about to be fully opened, the reduction in spring force will cause the air pressure behind the pressure regulator to decrease accordingly. The air pressure enters the pilot valve loading chamber through the A1 port, and is loaded with thrust through the pilot valve diaphragm 86 and compared with the pilot valve spring force. Since the air pressure is low, the pilot valve spring 83 will push the pilot valve diaphragm 86 to move to the right in the figure, thereby driving the pilot valve piston to move to the right. At this time, the A2-C2 port is closed and the B-C1 port is opened, and the air pressure enters the differential pressure elastic airbag chamber D through the B-C1 port. After inflation, the differential pressure elastic airbag 6 expands toward the center and squeezes the bulge of the pressure regulator diaphragm 2, so that the bulge of the pressure regulator diaphragm 2 shrinks toward the center together, thereby reducing the force area of ​​the pressure regulator diaphragm 2 accordingly, so as to achieve the effect of reducing the air pressure thrust of the pressure regulator diaphragm 2, and quickly reach a balance with the reduced pressure regulator spring force, so that the pressure regulator quickly reaches the fully open state, and improves the performance of the fully open limit.

[0064] Therefore, the variable loading structure is a self-supporting structure that does not require external force and has a new structure with adaptive adjustment, and can solve the performance defects of the prior art without changing the structure of the prior art voltage regulator.

[0065] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A pressure regulating structure of a variable loading type pressure regulator, which is arranged in a gas pressure regulator, wherein a pressure regulating diaphragm (2) is arranged in the gas pressure regulator, and is characterized in that: include A pressure differential elastic airbag (6), wherein the pressure differential elastic airbag (6) is mounted on the pressure regulator diaphragm (2); A pilot valve (8), wherein the pilot valve (8) is connected to the pressure differential elastic airbag (6) via an air guide signal tube (7); The pressure differential elastic airbag (6) is a completely sealed closed ring, and the interior of the pressure differential elastic airbag (6) is an elastic airbag cavity D; the pilot valve (8) is provided with a pilot valve air inlet A, and the air pressure P2 after the pressure regulator is connected through the pilot valve air inlet A; the pilot valve (8) comprises a pilot valve body (81), and a piston (82) is arranged in the pilot valve body (81); the pilot air signal pipe (7) is connected to the pilot valve body (81), and the on-off of the pilot air signal pipe (7) is controlled by the position of the piston (82); The pilot valve (8) comprises a pilot valve diaphragm cover (84), the pilot valve diaphragm cover (84) is connected to the pilot valve body (81), a pilot valve diaphragm (86) is arranged inside the pilot valve diaphragm cover (84), and the pilot valve diaphragm (86) cooperates with the piston rod of the piston (82); One end of the pilot valve membrane cover (84) is connected to the pilot valve body (81), and the other end of the pilot valve membrane cover (84) is connected to the pilot valve air inlet A. A pilot valve loading chamber (85) is formed between the pilot valve membrane (86) and the opening of the pilot valve membrane cover (84), and the opening of the pilot valve membrane cover (84) is the loading chamber air inlet A1; The connection between the air guide signal pipe (7) and the pilot valve body (81) is a first air vent C1 of the signal pipe and a second air vent C2 of the signal pipe. The first air vent C1 of the signal pipe and the second air vent C2 of the signal pipe are arranged in parallel and both lead to the pilot valve body (81). A pilot valve channel (87) is further provided between the pilot valve body (81) and the pilot valve air inlet A. The pilot valve channel (87) bypasses the pilot valve loading chamber (85). The opening of the pilot valve channel (87) is a pilot valve channel vent B. The pilot valve channel vent B corresponds to the position of the first vent C1 of the signal tube. The pilot valve body (81) is also provided with a pilot valve vent A2, and the pilot valve vent A2 corresponds to the position of the second vent C2 of the signal tube.

2. The voltage regulating structure of the variable loading voltage regulator according to claim 1, characterized in that: A pilot valve spring (83) is also installed in the pilot valve diaphragm cover (84). The pilot valve spring (83) is sleeved on the piston rod of the piston (82) and pressed on the pilot valve diaphragm (86).

3. The voltage regulating structure of the variable loading voltage regulator according to claim 1, characterized in that: The pressure regulator diaphragm (2) is convex under pressure, and the pressure difference elastic airbag (6) is installed on the outer circumference of the convexity of the pressure regulator diaphragm (2), and the pressure difference elastic airbag (6) is made of rubber material.

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