Diaphragm valve assembly and control system with pressure passive intervention function

Abstract

The present invention discloses a diaphragm valve assembly and a control system with a pressure passive intervention function, which relates to the technical field of diaphragm valves. Based on the operating principle of a conventional diaphragm valve, two pressurized / released cavities are added to the valve core structure without affecting normal use. Specifically, the active movement process of the valve core structure is controlled in a pneumatic form, and the pressure state in the medium flow process is coordinated to "actively intervene" in the movement process of the valve core structure. During this process, the force generated by the high fluctuating pressure difference or high pressure borne by the release cavity can act reversely on the pressurized cavity. The purpose is to reduce the deformation degree of the rubber jacket at the corresponding release cavity, and avoid the influence of the over-stroke deformation or multiple deformation processes of the rubber jacket's own resilience due to the change of medium pressure. Based on the above content, a targeted control system is set in the overall solution to coordinate control or adjustment with active parameters and passive parameters.

Description

Technical Field

[0001] The present invention relates to the technical field of diaphragm valves, and in particular to a diaphragm valve assembly and a control system with a pressure passive intervention function. Background Art

[0002] The diaphragm valve is similar to the conventional valve body structure, the difference lies in the internal diaphragm. The principle can be referred to the relevant content mentioned in CN113167394A. The conventional valve core structure is replaced by a diaphragm with elastic ability. It has relatively outstanding advantages and is mainly used to meet the flow regulation requirements of corrosive / toxic media.

[0003] It should be noted that: under the use requirement of large fluctuations in medium pressure, the advantages of the diaphragm valve are obvious "disadvantages", which are specifically manifested as: the diaphragm undergoes multiple deformations and movements, and the amount of deformation and movement will also fluctuate greatly. For example, when the diaphragm undergoes multiple over-stroke deformations and movements under the impact of high-pressure media, the toughness and ductility of the diaphragm change. Especially for high-temperature and high-pressure media, under the influence of the dual factors of pressure and temperature, the diaphragm is difficult to reset normally, and even becomes brittle and cracks, resulting in internal leakage inside the valve body;

[0004] This application proposes a solution to this problem. Summary of the invention

[0005] The purpose of the present invention is to provide a diaphragm valve assembly and control system with a passive pressure intervention function. According to the operating principle of the diaphragm valve, when meeting the flow regulation requirements of high-temperature / high-pressure corrosive / toxic media, the diaphragm therein will undergo multiple over-stroke deformation and movement processes, resulting in changes in the physical properties of the diaphragm, and even brittle cracking, and ultimately internal leakage of the valve body.

[0006] The object of the present invention can be achieved by the following technical scheme: a diaphragm valve assembly with a pressure passive intervention function, comprising a valve body and an air pump group, wherein a medium flow channel is opened inside the valve body, and an air storage sleeve is installed above the outer wall of the valve body, and a working component is arranged in the diaphragm valve assembly;

[0007] The working assembly includes a valve stem, a rubber jacket, a piston plate and an inner valve core, wherein the rubber jacket and the inner valve core are located in the medium flow channel, the piston plate is located in the inner position of the air chamber sleeve, the valve stem penetrates downward to the center position of the medium flow channel, and the lower end position of the valve stem is connected to the inner valve core, the rubber jacket is arranged at the outer wall position of the inner valve core, and the outer wall of the rubber jacket matches the outer wall position of the center position of the medium flow channel;

[0008] The piston plate is installed on the valve stem, and the piston plate matches the inner wall of the air chamber sleeve. The air chamber sleeve is provided with an air sleeve group corresponding to the air pump group. An air flow channel is provided in the internal position of the valve stem corresponding to the lower side of the piston plate, and the valve stem is provided with an upper air release port and a lower air release port connected to the air flow channel along the direction from top to bottom. The upper air release port is located at the lower side position of the air chamber sleeve corresponding to the piston plate, and the lower air release port is located in the middle position between the top end of the rubber jacket and the upper surface of the inner valve core.

[0009] It is further configured as follows: the interior of the gas chamber sleeve is divided into an upper gas chamber and a lower gas chamber arranged from top to bottom by a piston plate, and the setting position of the gas sleeve group corresponds to the setting position of the upper gas chamber and the lower gas chamber.

[0010] It is further configured as follows: a displacement sensor is installed at the outer upper end position of the gas chamber sleeve, and the end position of the transmission rod of the displacement sensor is fixedly connected to the top position of the valve stem.

[0011] It is further configured as follows: the cross-section at the center point of the medium flow channel is vertically elliptical and is configured as a scheduling cavity, the length of the rubber jacket along the vertical direction is smaller than the length of the scheduling cavity along the vertical direction, and the positions of the scheduling cavity corresponding to the upper and lower sides of the rubber jacket are configured as buffer cavities.

[0012] It is further configured as follows: the middle section of the rubber jacket is cylindrical, the inner valve core is cylindrical and matches the middle section of the rubber jacket, and a pressure-bearing cavity and a pressure-releasing cavity are respectively opened in the rubber jacket along the upper and lower sides of the inner valve core.

[0013] It is further configured as follows: the lower end of the valve stem is flush with the lower surface of the inner valve core, and the lower end of the valve stem is open through the air flow channel and communicates with the inside of the pressure relief cavity, the upper air release port is communicated with the inside of the lower air storage, and the lower air release port is communicated with the inside of the pressurized cavity.

[0014] A control system for a diaphragm valve assembly with a pressure passive intervention function, wherein the control system is associated with the operation process of a displacement sensor and an air pump assembly, specifically comprising the following steps:

[0015] Step 1: The control system includes a data integration unit, a data interaction analysis unit and an interaction action unit, wherein the data integration unit is used to record the passive parameters of the displacement sensor and the active parameters in the air pump group, and input the passive parameters and the active parameters into the data interaction analysis unit;

[0016] Step 2: Based on the passive parameters and active parameters in the data integration unit, an active action analysis process of the medium flow process in the associated valve body is performed, and the passive action analysis process is performed on the active action analysis process with the passive parameters, and the state level in the medium flow process is obtained based on the passive action analysis process;

[0017] Step 3: The interactive action unit is used to control the operation process of the air pump group and adjust the active parameters in the air pump group according to the state series and the medium flow process.

[0018] The present invention has the following beneficial effects:

[0019] 1. The present invention is based on the basic structure and operating principle of a conventional diaphragm valve, and improves the valve core structure without affecting its normal use. Specifically, the valve core structure is formed by "covering" the inner valve core with a rubber jacket, and the elastic effect of the rubber jacket itself is used to achieve the function of sealing / adjusting the opening. However, the key lies in: improving the setting position of the inner valve core and the rubber jacket to optimize the pressure-bearing cavity and the pressure-releasing cavity arranged up and down. The rubber jacket at the pressure-releasing cavity serves as the direct part that directly bears the pressure change of the medium, but the rubber jacket at this part will not directly produce a large over-stroke deformation or multiple deformation. Specifically, the rubber jacket corresponding to the pressure-bearing cavity "actively bears" the medium pressure, thereby reducing the deformation degree of the rubber jacket at the corresponding pressure-releasing cavity, and avoiding the influence of the rubber jacket's own resilience performance on the over-stroke deformation or multiple deformation process caused by the medium pressure change.

[0020] 2. In conjunction with the above content, it is explained that: a control system is specially added to the operation process of the displacement sensor and the air pump group. The essence of the control system is a "passive intervention" method, which is manifested in: first, the active parameters of the air pump group during operation are combined with the passive parameters of the displacement sensor, and then two analysis processes are performed. The purpose is: based on the parameters of the valve body during operation, on the basis of satisfying the medium flow, further "passive intervention" in the active parameters of the air pump group is used to stabilize the stability of the valve core structure. 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 This is a schematic structural diagram of a diaphragm valve assembly with a pressure passive intervention function proposed by the present invention;

[0023] Figure 2 The diaphragm valve assembly with pressure passive intervention function proposed by the present invention Figure 1 A cross-sectional view of

[0024] Figure 3 A cross-sectional view of a valve body in a diaphragm valve assembly with a pressure passive intervention function proposed by the present invention;

[0025] Figure 4 The diaphragm valve assembly with pressure passive intervention function proposed by the present invention Figure 3 A front view of

[0026] Figure 5 The diaphragm valve assembly with pressure passive intervention function proposed by the present invention Figure 3 A cutaway view of the middle rubber jacket;

[0027] Figure 6 The diaphragm valve assembly with pressure passive intervention function proposed by the present invention Figure 1 Position relationship diagram;

[0028] Figure 7 This is a disassembled diagram of the rubber jacket and the valve stem in the diaphragm valve assembly with pressure passive intervention function proposed by the present invention.

[0029] In the figure: 1. valve body; 2. air chamber sleeve; 201. upper air chamber; 202. lower air chamber; 3. air sleeve assembly; 4. displacement sensor; 5. piston plate; 6. valve stem; 601. upper air outlet; 602. lower air outlet; 7. medium flow channel; 701. buffer cavity; 8. inner valve core; 9. rubber jacket; 901. pressurized cavity; 902. pressure relief cavity. DETAILED DESCRIPTION

[0030] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Embodiment 1: With respect to the operating principle of the diaphragm valve, when meeting the flow regulation requirements of high-temperature / high-pressure corrosive / toxic media, the diaphragm will undergo multiple over-stroke deformation and movement processes, resulting in changes in the physical properties of the diaphragm, and even brittle cracking, and eventually internal leakage of the valve body. The following technical solutions are proposed:

[0032] Reference Figure 1 to Figure 7 The diaphragm valve assembly with passive pressure intervention function in this embodiment includes a valve body 1 and an air pump group. A medium flow channel 7 is opened inside the valve body 1, and an air storage sleeve 2 is installed on the upper position of the outer wall of the valve body 1. A working component is provided in the diaphragm valve assembly;

[0033] The working assembly includes a valve stem 6, a rubber jacket 9, a piston plate 5 and an inner valve core 8. The rubber jacket 9 and the inner valve core 8 are located in the medium flow channel 7. The piston plate 5 is located in the inner position of the gas chamber sleeve 2. The valve stem 6 penetrates downward to the center position of the medium flow channel 7, and the lower end position of the valve stem 6 is connected to the inner valve core 8. The rubber jacket 9 is arranged at the outer wall position of the inner valve core 8, and the outer wall of the rubber jacket 9 matches the outer wall position of the center position of the medium flow channel 7.

[0034] The piston plate 5 is installed on the valve stem 6, and the piston plate 5 matches the inner wall of the air chamber sleeve 2. The air chamber sleeve 2 is provided with an air sleeve group 3 corresponding to the air pump group. The valve stem 6 is provided with an air flow channel in the internal position corresponding to the lower side of the piston plate 5, and the valve stem 6 is provided with an upper air leakage port 601 and a lower air leakage port 602 connecting the air flow channel along the direction from top to bottom. The upper air leakage port 601 is located at the lower side position corresponding to the piston plate 5 in the air chamber sleeve 2, and the lower air leakage port 602 is located in the middle position between the top of the rubber jacket 9 and the upper surface of the inner valve core 8. The interior of the air chamber sleeve 2 is divided into an upper air chamber 201 and a lower air chamber 202 arranged from top to bottom by the piston plate 5, and the setting position of the air sleeve group 3 corresponds to the setting position of the upper air chamber 201 and the lower air chamber 202.

[0035] Working principle: The internal structure of the diaphragm valve in the present invention is relatively simple. The only thing that needs to be noted is that the rubber jacket 9 needs to completely cover the inner valve core 8, and the rubber jacket 9 has the characteristic of high corrosion resistance, and the structural surface in contact with the medium cannot be made of metal. This part is relatively similar to the structure of a conventional diaphragm valve;

[0036] But combined with Figure 2 It should be noted that: when the medium enters from the left side of the valve body 1, when the rubber sleeve 9 completely covers the inner valve core 8 and completely blocks the center point of the medium flow channel 7, the medium flow channel is in a completely sealed state; on the contrary, when the inner valve core 8 moves upward by a certain distance through the valve stem 6, there is a gap between the lower part of the rubber sleeve 9 and the medium flow channel 7, which can indicate that the inside of the valve body 1 is in a small opening state, and the opening can be increased as the inner valve core 8 moves upward.

[0037] It is also necessary to further explain that: combined with Figure 2 and Figure 6 Regarding the pressure relief cavity 902, it can be understood that: when the medium flows inside the medium flow channel 7, because the interior of the pressure relief cavity 902 is hollow, the liquid pressure / gas pressure of the medium itself will directly act on the rubber jacket 9 at the corresponding pressure relief cavity 902, causing the rubber jacket 9 at this position to undergo a larger or smaller deformation process, which can further increase the opening of the valve body 1.

[0038] Embodiment 2: This embodiment describes the specific operation details of the working component:

[0039] The cross-section at the center point of the medium flow channel 7 is vertically elliptical and is set as a scheduling cavity. The length of the rubber jacket 9 in the vertical direction is less than the length of the scheduling cavity in the vertical direction. The scheduling cavity corresponding to the upper and lower sides of the rubber jacket 9 are set as buffer cavities 701. The middle section of the rubber jacket 9 is cylindrical, and the inner valve core 8 is cylindrical and matches the middle section of the rubber jacket 9. A pressure cavity 901 and a pressure relief cavity 902 are respectively opened in the rubber jacket 9 along the upper and lower sides of the inner valve core 8. The lower end of the valve stem 6 is flush with the lower surface of the inner valve core 8, and the lower end of the valve stem 6 is open through the air flow channel and is connected to the inside of the pressure relief cavity 902. The upper air release port 601 is connected to the inside of the lower air storage 202, and the lower air release port 602 is connected to the inside of the pressure cavity 901.

[0040] Solution description: First of all, it should be explained that the driving power source of the valve stem 6 in the present invention is compressed gas, which is essentially the air pump group injecting compressed gas into the air chamber sleeve 2 through the air sleeve group 3, but the difference is: combined with Figure 6 The upper gas chamber 201 and the lower gas chamber 202 are arranged such that, in order to drive the valve stem 6 to move upward, it is necessary to first fill the lower gas chamber 202 with compressed gas and the upper gas chamber 201 is in a synchronous deflated state, so that the piston plate 5 generates an upward thrust, thereby driving the inner valve core 8 to move upward. Conversely, when the inner valve core 8 is reset, compressed gas is filled into the upper gas chamber 201.

[0041] However, this embodiment further restricts the internal structure of the inner valve core: when the compressed gas is injected into the lower air chamber 202, the compressed gas will also enter the air flow channel through the upper air release port 601, and then inflate the pressurized cavity 901 through the lower air release port 602, and finally inflate the pressure-releasing cavity 902. The purpose of this process is: when the inner valve core 8 starts to move upward, because the pressure-releasing cavity 902 and the pressurized cavity 901 are inflated synchronously, and part of the internal position of the rubber jacket 9 is connected to the inner valve core 8, it is ensured that the rubber jacket 9 is always in full contact with the structural surface at the center of the medium flow channel 7, so as to avoid the high-pressure medium from directly impacting the rubber jacket 9 when the high-pressure medium flow requirements are met, resulting in the actual opening of the valve body 1 being much larger than the preset opening;

[0042] In this regard, it is explained in conjunction with the pressure-releasing cavity 902 and the pressurized cavity 901 that: when the rubber jacket 9 at the corresponding pressure-releasing cavity 902 is subjected to high pressure, it will further deform, which is manifested as: its internal volume is reduced so that the gas inside it first flows back into the pressurized cavity 901, causing the rubber jacket 9 at the corresponding pressurized cavity 901 to further deform. However, the key is that the gas inside the pressurized cavity 902 flows back into the lower air chamber 202, and then the piston plate 5 is further subjected to the upward thrust, causing the inner valve core 8 to move further upward. In this process It should be noted that: because the inner valve core 8 "actively gives way" to the high-pressure medium, on the one hand, further pressurizing the piston plate 5 increases the opening of the medium flow channel, and on the other hand, it will also reduce the pressure on the rubber jacket 9 at the corresponding pressure cavity 902, thereby reducing the deformation degree of the rubber jacket 9 at this location. However, the key point is: it is the pressure cavity 901 that actively bears the high fluctuating pressure or high pressure that may occur at the pressure-releasing cavity 902, specifically combined with the cross-section of the rubber jacket 9 at the center point of the medium flow channel 7, which can be referred to Figure 7 The inner valve core 8 can be understood as completely blocking the center point of the medium flow channel, so that the middle section of the rubber jacket 9 is particularly set as a cylinder, and the buffer cavity 701 therein only serves as a working space for the rubber jacket 9 to move, and is used to buffer the rubber jacket 9.

[0043] Embodiment 3: The operating system in this embodiment is proposed in combination with Embodiment 1 and Embodiment 3:

[0044] A displacement sensor 4 is installed on the upper end of the air chamber sleeve 2, and the end of the transmission rod of the displacement sensor 4 is fixedly connected to the top of the valve stem 6;

[0045] The control system is associated with the operation process of the displacement sensor 4 and the air pump group, and specifically includes the following steps:

[0046] Step 1: The control system includes a data integration unit, a data interaction analysis unit and an interaction action unit. The data integration unit is used to record the passive parameters of the displacement sensor 4 and the active parameters in the air pump group, and input the passive parameters and the active parameters into the data interaction analysis unit;

[0047] Step 2: Based on the passive parameters and active parameters in the data integration unit, an active action analysis process of the medium flow process in the associated valve body 1 is performed, and a passive action analysis process is performed on the active action analysis process with the passive parameters, and the state level in the medium flow process is obtained based on the passive action analysis process;

[0048] Step 3: The interactive action unit is used to control the operation process of the air pump group and adjust the active parameters in the air pump group according to the state series and the medium flow process.

[0049] Solution description: The active parameters in the overall solution mainly represent the gas volume and gas filling speed when the air pump group fills the lower gas chamber 202 with compressed gas, which are respectively represented as Qo and Vq. The two parameters are used as relative variables and are specifically controlled according to the use requirements. For example, when the inner valve core 8 needs to be lifted up by a distance of L, it is necessary to generate an upward thrust on the piston plate 5 by controlling the gas volume and move it upward by a distance of L. This part is related to parameters such as the inner diameter and inner surface area of ​​the gas chamber sleeve 2, which will not be described in this embodiment;

[0050] However, for the passive parameters, the essence is to record the upward movement distance of the inner valve core 8 in real time through the displacement sensor 4. The displacement sensor 4 is a passive structure, which only generates a corresponding value when the valve stem 6 moves upward / downward when the gas is filled into the gas chamber sleeve 2. Lt represents the displayed value of the displacement sensor 4, and Vt represents the moving speed of the inner valve core 8, so Lt and Vt are both passive parameters;

[0051] In conjunction with the active action analysis process, the following is explained: the active action analysis process means that when the medium flows normally, the amount of compressed gas injected into the air chamber sleeve 2 is controlled to drive the inner valve core 8 to move upward, so that the medium flow channel 7 inside the valve body 1 is in a state of small opening or large opening. The upward movement distance of the valve stem 6 is calculated according to the parameters such as the inner diameter and inner surface area of ​​the air chamber sleeve 2, and La represents the actual stroke of the inner valve core 6 during the active action analysis process; however, affected by the pressure of the medium itself, as shown in Example 2, the valve stem 6 will further move upward a small distance under the action of the medium pressure, which can be set to Lb, Lb represents the additional movement distance of the valve stem 6, and Lb is an uncontrollable variable, which is specifically related to the hydraulic pressure / air pressure of the medium itself, and is explained as follows:

[0052] S1: First, let's explain it in combination with La. If the inner valve core 8 and the rubber jacket 9 are not under the medium pressure, then the Vt of the inner valve core 8 is only directly related to Vq. If Vq is large, the Vt of the inner valve core 8 will also increase relatively.

[0053] S2: On the contrary, based on Lb, the moving speed of the inner valve core is further calculated. Due to the effect of the medium pressure, the moving speed of the inner valve core 8 is not equal to Vt, so Vb represents the actual moving stroke of the inner valve core. On the basis of maintaining Vq constant, the state level is calculated by M= (Vb-Vt) / Vt. M represents the state level, and the state level is mainly used to represent the medium pressure borne by the rubber jacket 9 at the corresponding pressurized cavity 902. In order to avoid excessive deformation of the rubber jacket 9 at this location, the upper air chamber 201 is first supplemented with air to make the inner valve core 8 move downward in the opposite direction by Lb. The purpose is first to maintain the opening of the valve body 1, and then Vb needs to be further reduced. Specifically, if the gas volume in the active parameter is Qo, then the gas volume needs to be readjusted to , specifically by changing Vb.

[0054] Combined with S1 and S2, on the basis of maintaining the internal valve core 8 to return to the actual opening, it is theoretically necessary to reduce the gas storage in the lower gas chamber 202-air flow channel-pressure cavity 901-pressure relief cavity 902, but in fact the rubber jacket 9 corresponding to the pressure relief cavity 902 is still in the squeezed state, but the key deformation process is specifically reflected in the rubber jacket 9 corresponding to the pressure cavity 901. Figure 6 , because the rubber jacket 9 of this part will never contact the medium, and thus is less affected by the medium. To summarize, in the specific use process, in order to adapt to the change of medium pressure, it is necessary to first maintain the position of the inner valve core 8 stable and maintain the opening, and secondly, to supplement the upper gas chamber 201 with air and reduce the gas filling speed of the lower gas chamber 202 in the form of passive intervention. In actual circumstances, the gas stock in the lower gas chamber 202-air flow channel-pressure cavity 901-depressurization cavity 902 has not changed significantly. The only change is that the deformation process that the rubber jacket 9 at the corresponding depressurization cavity 902 "should bear" is "transferred" to the rubber jacket 9 at the corresponding pressure cavity 901, so as to avoid a large rebound change in the rubber jacket 9 on the working surface (contacting the medium).

[0055] In summary: based on the operating principle of conventional diaphragm valves, two pressurized / released cavities are added to the valve core structure without affecting normal use. Specifically, the active movement process of the valve core structure is controlled pneumatically, and the pressure state in the medium flow process is "actively intervened" in the movement of the valve core structure. In this process, the force generated by the high fluctuating pressure difference or high pressure in the pressure release cavity can act reversely on the pressurized cavity. The purpose is to reduce the deformation degree of the rubber jacket at the corresponding pressure release cavity, and avoid the influence of the rubber jacket's own rebound performance on over-stroke deformation or multiple deformation processes due to changes in medium pressure. Based on the above content, a targeted control system is set up in the overall solution to coordinate control or adjustment with active parameters and passive parameters.

[0056] The above contents are merely examples and explanations of the structure of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

[0057] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", 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 representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0058] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A diaphragm valve assembly with a pressure passive intervention function, comprising a valve body and an air pump assembly, characterized in that: A medium flow channel is provided inside the valve body, and a gas chamber sleeve is installed above the outer wall of the valve body, and a working component is provided in the diaphragm valve assembly; The working assembly includes a valve stem, a rubber jacket, a piston plate and an inner valve core, wherein the rubber jacket and the inner valve core are located in the medium flow channel, the piston plate is located in the inner position of the air chamber sleeve, the valve stem penetrates downward to the center position of the medium flow channel, and the lower end position of the valve stem is connected to the inner valve core, the rubber jacket is arranged at the outer wall position of the inner valve core, and the outer wall of the rubber jacket matches the outer wall position of the center position of the medium flow channel; The piston plate is installed on the valve stem, and the piston plate matches the inner wall of the air chamber sleeve. The air chamber sleeve is provided with an air sleeve group corresponding to the air pump group. An air flow channel is provided in the internal position of the valve stem corresponding to the lower side of the piston plate, and the valve stem is provided with an upper air release port and a lower air release port connected to the air flow channel along the direction from top to bottom. The upper air release port is located at the lower side position of the air chamber sleeve corresponding to the piston plate, and the lower air release port is located in the middle position between the top end of the rubber jacket and the upper surface of the inner valve core.

2. The diaphragm valve assembly with pressure passive intervention function according to claim 1, characterized in that: The interior of the gas chamber sleeve is divided into an upper gas chamber and a lower gas chamber arranged from top to bottom by a piston plate, and the arrangement position of the gas chamber group corresponds to the arrangement positions of the upper gas chamber and the lower gas chamber.

3. The diaphragm valve assembly with pressure passive intervention function according to claim 1, characterized in that: A displacement sensor is installed on the outer upper end of the gas chamber sleeve, and the end position of the transmission rod of the displacement sensor is fixedly connected to the top position of the valve stem.

4. The diaphragm valve assembly with pressure passive intervention function according to claim 1, characterized in that: The cross section at the center point of the medium flow channel is vertically elliptical and is set as a scheduling cavity. The length of the rubber jacket along the vertical direction is smaller than the length of the scheduling cavity along the vertical direction. The positions of the scheduling cavity corresponding to the upper and lower sides of the rubber jacket are set as buffer cavities.

5. The diaphragm valve assembly with pressure passive intervention function according to claim 1, characterized in that: The middle section of the rubber jacket is cylindrical, the inner valve core is cylindrical and matches the middle section of the rubber jacket, and a pressure-bearing cavity and a pressure-releasing cavity are respectively provided inside the rubber jacket along the upper and lower sides of the inner valve core.

6. The diaphragm valve assembly with pressure passive intervention function according to claim 5, characterized in that: The lower end of the valve stem is flush with the lower surface of the inner valve core, and the lower end of the valve stem is open through the air flow channel and communicates with the inside of the pressure relief cavity, the upper air release port is communicated with the inside of the lower air bin, and the lower air release port is communicated with the inside of the pressure cavity.

7. A control system for a diaphragm valve assembly with a pressure passive intervention function, using the diaphragm valve assembly with a pressure passive intervention function as claimed in any one of claims 1 to 6, characterized in that: The control system is associated with the operation process of the displacement sensor and the air pump group, and specifically includes the following steps: Step 1: The control system includes a data integration unit, a data interaction analysis unit and an interaction action unit, wherein the data integration unit is used to record the passive parameters of the displacement sensor and the active parameters in the air pump group, and input the passive parameters and the active parameters into the data interaction analysis unit; Step 2: Based on the passive parameters and active parameters in the data integration unit, an active action analysis process of the medium flow process in the associated valve body is performed, and the passive action analysis process is performed on the active action analysis process with the passive parameters, and the state level in the medium flow process is obtained based on the passive action analysis process; Step 3: The interactive action unit is used to control the operation process of the air pump group and adjust the active parameters in the air pump group according to the state series and the medium flow process.

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