Self-operated regulating valve and differential pressure control system

Abstract

The invention discloses a self-operated regulating valve and a differential pressure control system.The self-operated regulating valve comprises a regulating valve shell, a valve element assembly and a pipeline piece, a low-pressure fluid cavity and a high-pressure fluid cavity are formed in an inner cavity of the regulating valve shell, and a low-pressure fluid inlet is formed in the position, corresponding to the low-pressure fluid cavity, of the peripheral side of the regulating valve shell; a feedback adjusting inlet is formed in the end side, corresponding to the low-pressure fluid cavity, of the adjusting valve shell, a high-pressure fluid inlet and a high-pressure fluid outlet are formed in the peripheral side, corresponding to the high-pressure fluid cavity, of the adjusting valve shell in a spaced mode, the valve element assembly comprises a valve element body and an elastic compression piece, and rod body parts of the valve element body are arranged in the low-pressure fluid cavity and the high-pressure fluid cavity respectively. The end cover portion of the valve element body is arranged on the rod body portion and located at the end of the low-pressure fluid cavity, the elastic compression piece is arranged on the rod body portion in a sleeving mode and elastically compressed in the low-pressure fluid cavity, the pipeline piece is used for communicating the high-pressure fluid outlet with the feedback adjusting inlet, the self-operated adjusting valve achieves control over pressure difference through a mechanical structure, and higher reliability is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of process control equipment, and in particular relates to a self-operated regulating valve and a pressure difference control system. Background Art

[0002] Pressure differential control is a common control target in the field of process control. For example, the discharge pressure of the compressor lubricating oil should be 0.1-0.2 MPa higher than the pressure in the crankcase for the compressor to work properly; the motor circulating coolant of the axial flow pump needs to be 1.2-1.6 MPa higher than the pump outlet pressure to ensure that the pumped medium does not enter the rotor cavity of the motor. In order to keep the pressure differential between the two fluids constant, the pressure sensors are required to detect the pressure values ​​of the two fluids in real time and transmit the measured values ​​to the controller. After the controller compares the given pressure differential with the real-time pressure differential, it drives the motor to adjust the size of the fluid valve opening, changes the flow rate of the fluid, and thus adjusts the pressure of the fluid to achieve a constant pressure differential between the two fluids. This electronic control scheme requires the installation of a large number of electronic sensors, controllers, and power supplies. The entire control system has a complex structure and is prone to failure when using many instruments and equipment. At the same time, most of the equipment used is electronic equipment, in which the power supply and signal transmission processes are easily interfered by the outside world, and the robustness of the system is poor. Summary of the invention

[0003] In view of the above defects or shortcomings, the present invention provides a self-operated regulating valve and a pressure difference control system, which aims to solve the technical problems that the existing regulating valves rely on electronic components for control, are easily interfered with, and have a high equipment failure rate.

[0004] To achieve the above-mentioned purpose, the present invention provides a self-operated regulating valve, wherein the self-operated regulating valve includes a regulating valve housing, a valve core assembly and a piping component; the inner cavity of the regulating valve housing is provided with a low-pressure fluid chamber and a high-pressure fluid chamber in sequence along a straight line, a low-pressure fluid inlet is provided on the peripheral side of the regulating valve housing corresponding to the low-pressure fluid chamber, a feedback regulating inlet is provided on the end side of the regulating valve housing corresponding to the low-pressure fluid chamber, and a high-pressure fluid inlet and a high-pressure fluid outlet are provided on the peripheral side of the regulating valve housing corresponding to the high-pressure fluid chamber; the valve core assembly includes a valve core body and an elastic compression component, the valve core body includes an end cover portion and a rod body portion, two ends of the rod body portion are respectively arranged in the low-pressure fluid chamber and the high-pressure fluid chamber, the end cover portion is arranged at the end of the rod body portion placed in the low-pressure fluid chamber, the elastic compression component is sleeved on the rod body portion and elastically compressed in the low-pressure fluid chamber; the piping component is used to connect the high-pressure fluid outlet and the feedback regulating inlet.

[0005] In an embodiment of the present invention, the self-operated regulating valve also includes a valve seat assembly, the valve seat assembly includes a valve core straightening sleeve and a valve seat body, the valve core straightening sleeve and the valve seat body are arranged in the high-pressure fluid chamber and are arranged in sequence along the low-pressure fluid chamber toward the high-pressure fluid chamber, the valve core straightening sleeve is formed with a rod penetration channel, the rod penetration channel allows the rod body to be movably penetrated and is sealed and fitted in the part close to the low-pressure fluid chamber, a first liquid inlet channel connected to the rod penetration channel is formed at one end of the valve core straightening sleeve away from the low-pressure fluid chamber, the high-pressure fluid inlet is connected to the first liquid inlet channel, the valve seat body is provided with a second liquid inlet channel for the rod body to extend into, and the high-pressure fluid outlet is arranged corresponding to and connected to the end of the second liquid inlet channel away from the valve core straightening sleeve.

[0006] In an embodiment of the present invention, the shaft portion includes a main body section and a neck section, which are arranged in sequence along the direction from the low-pressure fluid chamber to the high-pressure fluid chamber, the radial cross-sectional dimension of the main body section is larger than the radial cross-sectional dimension of the neck section, and the main body section can be sealed and assembled with the valve seat body.

[0007] In an embodiment of the present invention, the through-rod channel includes a first through-rod segment and a second through-rod segment, and the first through-rod segment and the second through-rod segment are arranged sequentially along the direction from the low-pressure fluid chamber to the high-pressure fluid chamber, the radial cross-sectional dimension of the second through-rod segment is larger than the radial cross-sectional dimension of the first through-rod segment, and the first liquid inlet channel is connected to the second through-rod segment.

[0008] In an embodiment of the present invention, the valve core righting sleeve includes a first righting section, a second righting section and a third righting section which are arranged in sequence, the first righting section and the third righting section are in contact with the side wall of the high-pressure fluid chamber, the second righting section forms a first liquid inlet channel, and the second righting section is separated from the side wall of the high-pressure fluid chamber to form a first annular flow channel.

[0009] In an embodiment of the present invention, the valve seat body includes a first seat body and a second seat body, the first seat body and the second seat body are arranged in sequence along the direction from the low-pressure fluid chamber to the high-pressure fluid chamber, and form a second liquid inlet channel, the first seat body abuts against the side wall of the high-pressure fluid chamber, and the second seat body is separated from the side wall of the high-pressure fluid chamber to form a second annular flow channel, the second annular flow channel is connected to the high-pressure fluid outlet, and a through hole connecting the second annular flow channel and the second liquid inlet channel is formed on the second seat body.

[0010] In an embodiment of the present invention, the valve seat assembly further comprises a valve seat plug, which is disposed in the high-pressure fluid chamber and abuts against the end of the valve seat body. A protrusion is formed on the valve seat plug, and the protrusion extends into the second liquid inlet channel.

[0011] In an embodiment of the present invention, the valve seat assembly further comprises a positioning sleeve, which is threadedly connected to the side wall of the high-pressure fluid chamber and is used to press the valve core straightening sleeve onto the valve seat body.

[0012] In an embodiment of the present invention, a limiting portion is formed on the side wall of the low-pressure fluid chamber, the limiting portion is located between the low-pressure fluid inlet and the end cover portion of the valve core body, and is used to limit the maximum movement distance of the valve core body.

[0013] In order to achieve the above object, the present invention further provides a pressure difference control system, wherein the pressure difference control system includes the above self-operated regulating valve.

[0014] Through the above technical solution, the self-operated regulating valve and pressure difference control system provided by the embodiment of the present invention have the following beneficial effects:

[0015] When the above-mentioned self-operated regulating valve is used, the low-pressure fluid enters the low-pressure fluid chamber from the low-pressure fluid inlet, and the high-pressure fluid flows from the high-pressure fluid inlet through the high-pressure fluid chamber and then flows out from the high-pressure fluid outlet, wherein part of the high-pressure fluid enters the feedback regulating inlet through the pipeline fitting, and applies a pressure to the end cover of the valve core body to move toward the high-pressure fluid chamber. Under normal working conditions, the pressure of the high-pressure fluid on the end cover is equal to the sum of the pressure of the low-pressure fluid and the elastic compression member on the end cover, and the pressure difference between the high-pressure fluid and the low-pressure fluid is maintained at a preset value. When the pressure difference between the high-pressure fluid and the low-pressure fluid increases, the pressure of the high-pressure fluid on the end cover is greater than the pressure of the low-pressure fluid and the elastic compression member on the end cover. The sum of the pressures of the compression parts on the end cover, the high-pressure fluid pushes the valve core body to move, the fluid area between the high-pressure fluid inlet and the high-pressure fluid outlet is reduced, and the resistance is increased. Since the pressure at the high-pressure fluid inlet remains constant, the pressure at the high-pressure fluid outlet gradually decreases until the pressures on both sides of the end cover are balanced, so that the pressure difference between the high-pressure fluid and the low-pressure fluid is restored to the preset value. If the pressure difference between the high-pressure fluid and the low-pressure fluid is reduced, the valve core body moves in the opposite direction until the pressure difference is restored to the preset value. The self-operated regulating valve controls the pressure difference between the two fluids through a mechanical structure, and has higher reliability than existing electrical control valve groups.

[0016] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide an understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention, but do not constitute a limitation of the present invention. In the accompanying drawings:

[0018] Figure 1 is a schematic diagram of the overall structure of a self-operated regulating valve according to an embodiment of the present invention;

[0019] Figure 2 is a schematic diagram of a liquid inlet channel of a high-pressure fluid chamber according to an embodiment of the present invention;

[0020] Figure 3is a schematic diagram of the internal structure of a high-pressure fluid chamber according to an embodiment of the present invention;

[0021] Figure 4 Schematic diagram of another structure of a self-operated regulating valve according to an embodiment of the present invention.

[0022] Description of Reference Numerals

[0023] 1 Control valve housing 11 Low-pressure fluid chamber

[0024] 12 High pressure fluid chamber 13 Feedback regulation inlet

[0025] 14 High-pressure fluid inlet 15 High-pressure fluid outlet

[0026] 16 Low pressure fluid inlet 17 Limiting part

[0027] 21 Valve core body 211 End cover

[0028] 212 shaft portion 213 necking section

[0029] 214 Main body section 3 Valve seat assembly

[0030] 31 Valve core straightening sleeve 311 First straightening section

[0031] 312 Second straightening section 313 Third straightening section

[0032] 315 Second rod section 316 First annular flow channel

[0033] 317 First liquid inlet channel 32 Valve seat body

[0034] 321 First seat body 322 Second seat body

[0035] 323 second liquid inlet channel 324 second annular flow channel

[0036] 325 Through hole 33 Valve seat plug

[0037] 331 raised portion 34 positioning sleeve

[0038] 4 Connecting plug 51 First sealing ring

[0039] 52 second sealing ring 53 third sealing ring

[0040] 54 Fourth sealing ring 55 Fifth sealing ring

[0041] 56 Sixth sealing ring 57 Seventh sealing ring DETAILED DESCRIPTION

[0042] The specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0043] The self-operated regulating valve of the present invention will be described below with reference to the accompanying drawings.

[0044] like Figures 1 to 4 As shown, the present invention provides a self-operated regulating valve, wherein the self-operated regulating valve comprises:

[0045] A regulating valve housing 1, wherein the inner cavity of the regulating valve housing 1 is provided with a low-pressure fluid chamber 11 and a high-pressure fluid chamber 12 in sequence along a straight line, a low-pressure fluid inlet 16 is provided on the peripheral side of the regulating valve housing 1 corresponding to the low-pressure fluid chamber 11, a feedback regulating inlet 13 is provided on the end side of the regulating valve housing 1 corresponding to the low-pressure fluid chamber 11, and a high-pressure fluid inlet 14 and a high-pressure fluid outlet 15 are provided on the peripheral side of the regulating valve housing 1 corresponding to the high-pressure fluid chamber 12 at intervals;

[0046] The valve core assembly includes a valve core body 21 and an elastic compression member. The valve core body 21 includes an end cover portion 211 and a rod body portion 212. The two ends of the rod body portion 212 are respectively arranged in the low-pressure fluid chamber 11 and the high-pressure fluid chamber 12. The end cover portion 211 is arranged at the end of the rod body portion 212 placed in the low-pressure fluid chamber 11. The elastic compression member is sleeved on the rod body portion 212 and elastically compressed in the low-pressure fluid chamber 11.

[0047] The pipeline is used to connect the high-pressure fluid outlet 15 and the feedback regulation inlet 13.

[0048] When the above-mentioned self-operated regulating valve is used, the low-pressure fluid enters the low-pressure fluid chamber 11 from the low-pressure fluid inlet 16, and the high-pressure fluid flows from the high-pressure fluid inlet 14 through the high-pressure fluid chamber 12 and then flows out from the high-pressure fluid outlet 15, wherein part of the high-pressure fluid enters the feedback regulating inlet 13 through the pipeline, and applies a pressure to the end cover portion 211 of the valve core body 21 to move toward the high-pressure fluid chamber 12. Under normal working conditions, the pressure of the high-pressure fluid on the end cover portion 211 is equal to the sum of the pressure of the low-pressure fluid and the elastic compression member on the end cover portion 211, and the pressure difference between the high-pressure fluid and the low-pressure fluid is maintained at a preset value. When the pressure difference between the high-pressure fluid and the low-pressure fluid increases, the pressure of the high-pressure fluid on the end cover portion 211 is greater than the pressure of the low-pressure fluid. The sum of the pressures of the high-pressure fluid and the elastic compression member on the end cover 211, the high-pressure fluid pushes the valve core body 21 to move, the fluid area between the high-pressure fluid inlet 14 and the high-pressure fluid outlet 15 is reduced, and the resistance is increased. Since the pressure at the high-pressure fluid inlet 14 remains constant, the pressure at the high-pressure fluid outlet 15 gradually decreases until the pressures on both sides of the end cover 211 are balanced, so that the pressure difference between the high-pressure fluid and the low-pressure fluid is restored to the preset value. If the pressure difference between the high-pressure fluid and the low-pressure fluid is reduced, the valve core body 21 moves in the opposite direction until the pressure difference is restored to the preset value. The self-operated regulating valve controls the pressure difference between the two fluids through a mechanical structure, and has higher reliability than the existing electrical control valve group.

[0049] It can be understood that when the pressure of the low-pressure fluid increases or decreases, the valve core body 21 will also move to increase or decrease the pressure of the high-pressure fluid outlet 15. The specific adjustment process is the same as the adjustment process of the above-mentioned high-pressure fluid change, and will not be repeated here.

[0050] In an embodiment of the present invention, the self-operated regulating valve also includes a valve seat assembly 3, which includes a valve core straightening sleeve 31 and a valve seat body 32. The valve core straightening sleeve 31 and the valve seat body 32 are arranged in the high-pressure fluid chamber 12 and are arranged in sequence along the low-pressure fluid chamber 11 toward the high-pressure fluid chamber 12. The valve core straightening sleeve 31 is formed with a rod penetration channel, and the rod penetration channel allows the rod body 212 to be movably penetrated and sealed in the part close to the low-pressure fluid chamber 11. The end of the valve core straightening sleeve 31 away from the low-pressure fluid chamber 11 is formed with a first liquid inlet channel 317 connected to the rod penetration channel, the high-pressure fluid inlet 14 is connected to the first liquid inlet channel 317, and the valve seat body 32 is provided with a second liquid inlet channel 323 for the rod body 212 to extend into, and the high-pressure fluid outlet 15 is arranged corresponding to and connected to the end of the second liquid inlet channel 323 away from the valve core straightening sleeve 31.

[0051] The valve seat assembly 3 is used to construct a flow channel in the high-pressure fluid chamber 12. Compared with the solution of directly constructing the flow channel through the regulating valve housing 1, the valve seat assembly 3 can be disassembled and replaced, which is convenient for maintenance. In addition, the valve seat assembly 3 can be designed separately according to different use environments and use the same regulating valve housing 1, thereby reducing production costs. The valve core straightening sleeve 31 is used to support the end of the shaft portion 212 away from the end cover portion 211 to ensure the stability of the movement of the valve core body 21; the high-pressure fluid inlet 14 and the high-pressure fluid outlet 15 are staggered with the valve seat body 32. By moving the valve core body 21, the fluid area from the first liquid inlet channel 317 to the second liquid inlet channel 323 can be adjusted, thereby realizing feedback adjustment of the pressure of the high-pressure fluid outlet 15.

[0052] Specifically, the high-pressure fluid flows through the high-pressure fluid inlet 14, the first liquid inlet channel 317, the rod-penetrating channel, the second liquid inlet channel 323 and the high-pressure fluid outlet 15 in sequence. When the pressure difference between the high-pressure fluid and the low-pressure fluid increases, the valve core body 21 moves toward the side where the high-pressure fluid chamber 12 is provided, and the rod body 212 extends into the second liquid inlet channel 323. The fluid area from the first liquid inlet channel 317 to the second liquid inlet channel 323 decreases, and the pressure at the high-pressure fluid outlet 15 gradually decreases until the pressure difference returns to a preset value; when the pressure difference between the high-pressure fluid and the low-pressure fluid decreases, the valve core body 21 moves toward the side where the low-pressure fluid chamber 11 is provided, and the rod body 212 extends into the second liquid inlet channel 323. The fluid area from the first liquid inlet channel 317 to the second liquid inlet channel 323 increases, and the pressure at the high-pressure fluid outlet 15 gradually increases until the pressure difference returns to a preset value.

[0053] In the embodiment of the present invention, the shaft 212 includes a main body section 214 and a neck section 213, which are sequentially arranged along the direction from the low-pressure fluid chamber 11 to the high-pressure fluid chamber 12, the radial cross-sectional dimension of the main body section 214 is larger than the radial cross-sectional dimension of the neck section 213, and the main body section 214 can be sealed and spliced ​​with the valve seat body 32. By arranging the main body section 214 and the neck section 213, the liquid inlet channel can be completely closed to cut off the high-pressure fluid, so that when the pressure of the high-pressure fluid outlet 15 is relatively high, the pressure difference between the high-pressure fluid and the low-pressure fluid can be quickly restored to a preset value.

[0054] Specifically, the radius of the main section 214 is greater than the radius of the neck section 213, and thus a step surface is formed between the main section 214 and the neck section 213. The step surface faces the valve seat body 32 and is spaced to form a liquid inlet. The first liquid inlet channel 317 and the second liquid inlet channel 323 are connected through the liquid inlet. When the valve core body 21 moves to make the step surface close to the valve seat body 32, the area of ​​the liquid inlet decreases and the resistance to the high-pressure fluid increases. When the valve core body 21 moves to make the step surface away from the valve seat body 32, the area of ​​the liquid inlet increases and the resistance to the high-pressure fluid decreases.

[0055] Furthermore, the step surface is inclined, which can avoid stress concentration on the one hand; on the other hand, the step surface can guide the rod body 212 when it extends into the second liquid inlet channel 323, so that the main body section 214 can smoothly enter the second liquid inlet channel 323, avoiding the main body section 214 from directly colliding with the valve seat body 32 due to the inclination of the valve core body 21.

[0056] In the embodiment of the present invention, the rod-penetrating channel includes a first rod-penetrating section and a second rod-penetrating section 315, which are sequentially arranged along the direction from the low-pressure fluid chamber 11 to the high-pressure fluid chamber 12, the radial cross-sectional dimension of the second rod-penetrating section 315 is larger than the radial cross-sectional dimension of the first rod-penetrating section, and the first liquid inlet channel 317 is connected to the second rod-penetrating section 315. The side wall of the first rod-penetrating section directly abuts against the main section 214 of the valve core body 21 to achieve sealing of the high-pressure fluid chamber 12, prevent the high-pressure fluid from entering the low-pressure fluid chamber 11 from the rod-penetrating channel, and ensure the normal operation of the self-operated regulating valve. The side wall of the second rod-penetrating section 315 is spaced apart from the rod body 212 to form an annular flow channel, so that the first liquid inlet channel 317 and the second liquid inlet channel 323, which are arranged in an offset manner, can be connected.

[0057] In the embodiment of the present invention, the valve core righting sleeve 31 includes a first righting section 311, a second righting section 312 and a third righting section 313 which are arranged in sequence. The first righting section 311 and the third righting section 313 abut against the side wall of the high-pressure fluid chamber 12, the second righting section 312 forms a first liquid inlet channel 317, and the second righting section 312 and the side wall of the high-pressure fluid chamber 12 are separated to form a first annular flow channel 316. The first righting section 311 and the third righting section 313 abut against the side wall of the high-pressure fluid chamber 12 to form a support point and a sealing structure; the second righting section 312 is used to construct the first annular flow channel 316, and the high-pressure fluid first enters the first annular flow channel 316 from the high-pressure fluid inlet 14, and then enters the first liquid inlet channel 317. It is understandable that the self-operated regulating valve requires the valve seat assembly 3 and the regulating valve housing 1 to be assembled. The main parts of the valve seat assembly 3 and the regulating valve housing 1 generally adopt a cylindrical structure, and the inner cavity of the regulating valve housing 1 is a closed environment. Therefore, during the assembly process, it is difficult to ensure that the first liquid inlet channel 317 can be exactly aligned with the high-pressure fluid inlet 14. The first annular flow channel 316 can ensure that the first liquid inlet channel 317 is always in a connected state with the high-pressure fluid inlet 14, thereby reducing the difficulty of assembly.

[0058] In the embodiment of the present invention, the valve seat body 32 includes a first seat body 321 and a second seat body 322. The first seat body 321 and the second seat body 322 are sequentially arranged along the direction from the low-pressure fluid chamber 11 to the high-pressure fluid chamber 12, and form a second liquid inlet channel 323. The first seat body 321 abuts against the side wall of the high-pressure fluid chamber 12, and the second seat body 322 is separated from the side wall of the high-pressure fluid chamber 12 to form a second annular flow channel 324, and the second annular flow channel 324 is connected to the high-pressure fluid outlet 15. The second seat body 322 is formed with a through hole 325 that connects the second annular flow channel 324 and the second liquid inlet channel 323. The first seat body 321 abuts against the side wall of the high-pressure fluid chamber 12 to form a support point and a sealing structure; the second seat body 322 is used to construct the second annular flow channel 324, and the high-pressure fluid in the second liquid inlet channel 323 enters the second annular flow channel 324 through the through hole 325 and then flows out from the high-pressure fluid outlet 15. The second annular flow channel 324 can ensure that the second liquid inlet channel 323 is always in communication with the high-pressure fluid outlet 15, and can also reduce the difficulty of assembly.

[0059] In the embodiment of the present invention, the valve seat assembly 3 further includes a valve seat plug 33, which is disposed in the high-pressure fluid chamber 12 and abuts against the valve seat body 32 end-on, and a convex portion 331 is formed on the valve seat plug 33, and the convex portion 331 extends into the second liquid inlet channel 323. The valve seat plug 33 is used to seal the high-pressure fluid chamber 12, and the convex portion 331 on the valve seat plug 33 can play a role in adjusting resistance. Figure 2 The raised portion 331 extends into the second liquid inlet channel 323. On the one hand, it can play a positioning role during the assembly process; on the other hand, the raised portion 331 reduces the radial cross-sectional area of ​​the second liquid inlet channel 323 on the side close to the through hole 325, and the resistance to the high-pressure fluid increases. By setting the size of the raised portion 331, the resistance to the high-pressure fluid can be adjusted. In actual use, different types of valve seat plugs 33 can be selected according to the required pressure of the high-pressure fluid outlet 15 to set the outlet pressure. Each type of valve group plug has a main body of the same size and raised portions 331 of different sizes.

[0060] Specifically, a mounting hole is provided on the side of the valve seat plug 33 facing away from the valve seat body 32, and the mounting hole is used in conjunction with a corresponding mounting tool. For example, the valve seat plug 33 is threadedly connected to the regulating valve housing 1, the mounting hole is a hexagonal hole, and the mounting tool is a hexagonal wrench.

[0061] In the embodiment of the present invention, the valve seat assembly 3 further includes a positioning sleeve 34, which is threadedly connected to the side wall of the high-pressure fluid chamber 12 and is used to press the valve core straightening sleeve 31 onto the valve seat body 32. By screwing the positioning sleeve 34, the pressure on the valve core straightening sleeve 31 can be adjusted; and since the position of the positioning sleeve 34 is adjustable, the manufacturing error of the valve seat assembly 3 and the regulating valve housing 1 itself in the axial direction can be compensated.

[0062] In an embodiment of the present invention, a limiting portion 17 is formed on the side wall of the low-pressure fluid chamber 11. The limiting portion 17 is located between the low-pressure fluid inlet 16 and the end cover portion 211 of the valve core body 21, and is used to limit the maximum movement distance of the valve core body 21 to prevent the displacement of the valve core body 21 from being too large, causing the valve core body 21 to collide with the valve seat end cover.

[0063] In the embodiment of the present invention, a connection plug 4 is provided in the feedback regulation inlet 13 , and the connection plug 4 is used to connect the pipeline and limit the movement of the valve core body 21 to prevent the valve core body 21 from escaping from the low-pressure fluid chamber 11 .

[0064] like Figure 4 As shown, in an embodiment of the present invention, the self-operated regulating valve also includes a sealing ring assembly, which includes seven sealing rings; the first sealing ring 51 on the valve seat plug 33 is used to prevent the leakage of high-pressure fluid; the second sealing ring 52 on the valve seat body 32 is used to prevent the high-pressure fluid from entering the second annular flow channel 324 when the main section 214 extends into the second liquid inlet channel 323; the third sealing ring 53 on the valve core straightening sleeve 31 is used to prevent the high-pressure fluid from entering the low-pressure fluid chamber 11; the fourth sealing ring 54 and the fifth sealing ring 55 on the main section 214 of the valve core body 21 are redundantly designed to prevent the high-pressure fluid from entering the low-pressure fluid chamber 11, and the sixth sealing ring 56 on the end cover 211 of the valve core body 21 is used to prevent the low-pressure fluid from entering the feedback regulating inlet 13; the seventh sealing ring 57 on the connecting plug 4 is used to prevent the high-pressure fluid from overflowing the feedback regulating inlet 13.

[0065] In order to achieve the above objectives, the present invention also provides a pressure differential control system, wherein the pressure differential control system includes the above-mentioned self-operated regulating valve. Since the pressure differential control system adopts all the technical solutions of the above-mentioned embodiments, it at least has the above-mentioned beneficial effects. The pressure differential control system adopts a purely mechanical regulating valve with structural reliability and low failure rate. No electronic equipment is installed on the on-site process pipeline, eliminating the explosion-proof design, and is particularly suitable for flammable and explosive process industries, such as refineries and chemical plants.

[0066] In the description of the present invention, it should be understood that 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 at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0067] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0068] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0069] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A self-operated regulating valve, characterized in that: The self-operated regulating valve comprises: A regulating valve housing (1), wherein the inner cavity of the regulating valve housing (1) is provided with a low-pressure fluid chamber (11) and a high-pressure fluid chamber (12) in sequence along a straight line, a low-pressure fluid inlet (16) is provided on the peripheral side of the regulating valve housing (1) corresponding to the low-pressure fluid chamber (11), a feedback regulating inlet (13) is provided on the end side of the regulating valve housing (1) corresponding to the low-pressure fluid chamber (11), and a high-pressure fluid inlet (14) and a high-pressure fluid outlet (15) are provided on the peripheral side of the regulating valve housing (1) corresponding to the high-pressure fluid chamber (12); A valve core assembly, comprising a valve core body (21) and an elastic compression member, wherein the valve core body (21) comprises an end cover portion (211) and a stem portion (212), wherein two ends of the stem portion (212) are respectively arranged in the low-pressure fluid chamber (11) and the high-pressure fluid chamber (12), the end cover portion (211) is arranged at the end of the stem portion (212) placed in the low-pressure fluid chamber (11), and the elastic compression member is sleeved on the stem portion (212) and elastically compressed in the low-pressure fluid chamber (11); A pipeline component is used to connect the high-pressure fluid outlet (15) and the feedback regulation inlet (13).

2. The self-operated regulating valve according to claim 1, characterized in that: The self-operated regulating valve further comprises a valve seat assembly (3), wherein the valve seat assembly (3) comprises a valve core straightening sleeve (31) and a valve seat body (32), wherein the valve core straightening sleeve (31) and the valve seat body (32) are arranged in the high-pressure fluid chamber (12) and are arranged in sequence along the direction from the low-pressure fluid chamber (11) toward the high-pressure fluid chamber (12), and the valve core straightening sleeve (31) is formed with a rod penetration channel, wherein the rod body (212) can be movably penetrated through the rod penetration channel and is close to the low-pressure fluid chamber (11). The valve seat body (32) is provided with a second liquid inlet channel (323) for the rod body (212) to extend into, and the high-pressure fluid outlet (15) is arranged corresponding to and connected to the second liquid inlet channel (323) at one end away from the valve core straightening sleeve (31).

3. The self-operated regulating valve according to claim 2, characterized in that: The shaft portion (212) includes a main body section (214) and a neck section (213), wherein the main body section (214) and the neck section (213) are arranged in sequence along the direction from the low-pressure fluid chamber (11) toward the high-pressure fluid chamber (12), the radial cross-sectional dimension of the main body section (214) is larger than the radial cross-sectional dimension of the neck section (213), and the main body section (214) can be sealed and assembled with the valve seat body (32).

4. The self-operated regulating valve according to claim 2, characterized in that: The penetration rod channel comprises a first penetration rod section and a second penetration rod section (315), the first penetration rod section and the second penetration rod section (315) are arranged in sequence along the direction from the low-pressure fluid chamber (11) to the high-pressure fluid chamber (12), the radial cross-sectional dimension of the second penetration rod section (315) is larger than the radial cross-sectional dimension of the first penetration rod section, and the first liquid inlet channel (317) is connected to the second penetration rod section (315).

5. The self-operated regulating valve according to claim 2, characterized in that: The valve core righting sleeve (31) comprises a first righting section (311), a second righting section (312) and a third righting section (313) which are arranged in sequence, the first righting section (311) and the third righting section (313) abut against the side wall of the high-pressure fluid chamber (12), the second righting section (312) forms the first liquid inlet channel (317), and the second righting section (312) and the side wall of the high-pressure fluid chamber (12) are spaced apart to form a first annular flow channel (316).

6. The self-operated regulating valve according to claim 2, characterized in that: The valve seat body (32) comprises a first seat body (321) and a second seat body (322). The first seat body (321) and the second seat body (322) are arranged in sequence along the direction from the low-pressure fluid chamber (11) to the high-pressure fluid chamber (12), and form the second liquid inlet channel (323). The first seat body (321) abuts against the side wall of the high-pressure fluid chamber (12), and the second seat body (322) is spaced apart from the side wall of the high-pressure fluid chamber (12) to form a second annular flow channel (324), the second annular flow channel (324) is connected to the high-pressure fluid outlet (15), and the second seat body (322) is formed with a through hole (325) connecting the second annular flow channel (324) and the second liquid inlet channel (323).

7. The self-operated regulating valve according to claim 2, characterized in that: The valve seat assembly (3) further comprises a valve seat plug (33), wherein the valve seat plug (33) is disposed in the high-pressure fluid chamber (12) and abuts against the end of the valve seat body (32), and a protrusion (331) is formed on the valve seat plug (33), and the protrusion (331) extends into the second liquid inlet channel (323).

8. The self-operated regulating valve according to claim 2, characterized in that: The valve seat assembly (3) further comprises a positioning sleeve (34), which is threadedly connected to the side wall of the high-pressure fluid chamber (12) and is used to press the valve core straightening sleeve (31) onto the valve seat body (32).

9. The self-operated regulating valve according to any one of claims 1 to 8, characterized in that: A limiting portion (17) is formed on the side wall of the low-pressure fluid chamber (11), and the limiting portion (17) is located between the low-pressure fluid inlet (16) and the end cover portion (211) of the valve core body (21), and is used to limit the maximum moving distance of the valve core body (21).

10. A pressure difference control system, characterized in that: The pressure difference control system comprises a self-operated regulating valve according to any one of claims 1 to 9.

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