A pilot operated electromagnetic valve having a pilot diaphragm assembly and its use

Abstract

The utility model relates to solenoid valve technical field especially relates to a pilot solenoid valve of pilot diaphragm subassembly and its application, pilot diaphragm subassembly includes: diaphragm seat, the center is provided with air hole, diaphragm seat one side around air hole even interval sets up multiple guide pieces, and guide piece extends to the direction away from diaphragm seat, diaphragm seat and guide piece between the establishment groove, diaphragm seat other side sets up connecting piece, diaphragm, install in the groove, with air hole coaxial arrangement, the utility model discloses through the groove and fixes diaphragm on diaphragm seat, improves the installation convenience, and diaphragm seat sets up guide piece and extends into the inside of valve body, improves the stability of diaphragm when opening, closing and moving up and down, makes the positioning sealing effect of valve port and diaphragm better.

Description

Technical Field

[0001] This utility model relates to the field of solenoid valve technology, and in particular to a pilot-operated solenoid valve with a guide diaphragm assembly and its application. Background Technology

[0002] Diaphragm-type pilot solenoid valves are common pneumatic or hydraulic control components widely used in industrial automation, fluid control, and other fields. They use electromagnetic force to drive the pilot valve section, thereby controlling the opening and closing of the main valve to achieve on / off control of large flow media. These solenoid valves typically include a valve body, diaphragm assembly, moving iron core, stationary iron core, and electromagnetic drive section. Their basic working principle is as follows: When energized, the electromagnetic force attracts the moving iron core to rise, opening the pilot valve port, releasing the pressure in the upper chamber of the diaphragm, and the diaphragm rises under the action of the inlet and outlet pressure difference, opening the main valve; when de-energized, the moving iron core descends under the action of the return spring and closes the pilot valve port, the pressure in the upper chamber of the diaphragm is rebuilt, the diaphragm falls back and seals against the main valve port, closing the main valve.

[0003] In existing technologies, diaphragm assemblies mostly adopt a structure in which the diaphragm and the metal frame are fixedly connected by a riveting process. Although this achieves the combination of the diaphragm and the frame, there is a lack of effective radial positioning and guiding structure between the diaphragm and the frame. This causes the diaphragm to be prone to skew when sealing with the valve port, making it difficult to ensure that the sealing surface is aligned and in uniform contact, which affects the reliability of the seal. Due to the lack of guidance, the diaphragm is prone to irregular wear during repeated opening and closing movements. This not only reduces the service life of the sealing pair, but also increases the amount of internal leakage due to the inability to maintain a centered and consistent sealing position after long-term use because the sealing pair is misaligned.

[0004] Therefore, a diaphragm-piloted solenoid valve with stable diaphragm assembly guidance and good sealing effect is needed. Utility Model Content

[0005] In view of at least one of the above technical problems, the present invention provides a pilot-operated solenoid valve with a guide diaphragm assembly and its application, which adopts an integrated guide structure and a snap-fit ​​engagement method to effectively ensure the axial guidance of the diaphragm movement and the sealing repeatability and positioning accuracy, while simplifying the assembly process and improving product reliability.

[0006] This utility model provides a guide diaphragm assembly, comprising: A diaphragm holder has a central air hole. Multiple guide members are evenly spaced around the air hole on one side of the diaphragm holder, and the guide members extend in a direction away from the diaphragm holder. A groove is formed between the diaphragm holder and the guide members. A connector is provided on the other side of the diaphragm holder. A diaphragm is installed in the groove and is coaxially arranged with the air hole.

[0007] In some embodiments of this utility model, one side of the diaphragm is recessed inward to form an arc-shaped area, the arc-shaped area and the guide member face the same side, and the end of the arc-shaped area near the air hole abuts against the guide member.

[0008] In some embodiments of this utility model, a protrusion is provided on one side of the diaphragm opposite to the arc-shaped area, the protrusion is close to the air hole and surrounds the air hole, and the protrusion abuts against the connector.

[0009] In some embodiments of this utility model, a limiting strip is provided circumferentially along the edge of the diaphragm, and the limiting strip faces the side of the connector.

[0010] In some embodiments of this utility model, the connector has a through-hole at its center, and a slot is formed at one end of the connector near the diaphragm.

[0011] In some embodiments of this utility model, an air nozzle is provided on the side of the air hole near the connector, and the air nozzle protrudes toward one side of the connector.

[0012] This utility model also provides a pilot-operated solenoid valve, comprising: The valve body has an air inlet on one side, an air outlet on the other side, and a valve port in the middle, which connects the air inlet and the air outlet. A diaphragm assembly, mounted on the valve body, includes the diaphragm seat and the diaphragm, the guide extends into the valve port, and the air hole is opposite to the valve port; A pressure plate is disposed on the valve body and abuts against the limiting strip; the pressure plate has a central hole. A moving iron core is mounted on the diaphragm assembly, with one end extending into the slot. The slot has space for the moving iron core to move toward or away from the diaphragm within the slot. A rubber plug is placed between the moving iron core and the air nozzle; A stationary iron core is installed on the side of the moving iron core away from the diaphragm assembly and is coaxially arranged with the moving iron core; A spring is installed between the moving iron core and the stationary iron core; A magnetic shielding tube is sleeved on the moving iron core and extends toward the stationary iron core; The coil assembly is sleeved on the magnetic shielding tube, with one inner wall abutting against the stationary iron core.

[0013] In some embodiments of this utility model, one end of the magnetic shielding tube abuts against the pressure plate, and a sealing ring is provided between the magnetic shielding tube and the pressure plate.

[0014] In some embodiments of this utility model, a movable groove is formed on the side of the moving iron core near the stationary iron core, and the spring is placed in the movable groove, with the spring abutting against the stationary iron core and the moving iron core.

[0015] In some embodiments of this utility model, a receiving cavity is formed at one end of the moving iron core facing the rubber plug, and the rubber plug is embedded in the receiving cavity.

[0016] The beneficial effects of this utility model are as follows: By setting a guide member extending into the valve cavity on the diaphragm seat and installing a diaphragm in the groove, this utility model achieves the purpose of providing axial guidance and limiting the opening and closing movement of the diaphragm, effectively preventing the diaphragm from deflecting during operation, improving the sealing reliability between the diaphragm and the valve port and extending the product's service life; by adopting a floating connection method in which the end of the moving iron core is inserted into the diaphragm seat groove, the requirements for the coaxiality of component processing and assembly are reduced, effectively ensuring that the moving iron core's axis of motion is automatically aligned with the sealing center, improving the response speed, action sensitivity, and working consistency of the solenoid valve; by setting a limiting strip on the edge of the diaphragm to cooperate with the valve body, and setting a sealing ring between the magnetic shielding tube and the pressure plate, multiple sealing and positioning are achieved. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the guide diaphragm assembly in an embodiment of the present invention; Figure 2 This is a top view of the guide diaphragm assembly in an embodiment of the present invention; Figure 3 for Figure 2 Cross-sectional view at point AA; Figure 4 This is a schematic diagram of the diaphragm structure in an embodiment of the present invention; Figure 5 This is a schematic diagram of the diaphragm holder in an embodiment of the present invention; Figure 6 This is a schematic diagram of the pilot-operated solenoid valve in an embodiment of the present invention; Figure 7 This is a top view of the pilot-operated solenoid valve in an embodiment of this utility model; Figure 8 for Figure 7 Cross-sectional view at point BB.

[0019] Reference numerals: 1. Diaphragm assembly; 2. Diaphragm seat; 201. Air hole; 2011. Air nozzle; 202. Guide; 203. Groove; 204. Connector; 2041. Slot; 3. Diaphragm; 301. Arc-shaped area; 302. Protrusion; 303. Limiting strip; 4. Valve body; 401. Air inlet; 402. Air outlet; 403. Valve port; 5. Pressure plate; 6. Moving iron core; 601. Movable groove; 602. Receiving cavity; 7. Rubber plug; 8. Stationary iron core; 9. Spring; 10. Magnetic shielding tube; 11. Coil assembly; 12. Sealing ring. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0021] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0023] This utility model provides a method such as Figures 1 to 5 The guide diaphragm assembly shown includes: A diaphragm seat 2 has an air hole 201 in the center. Multiple guide members 202 are evenly spaced around the air hole 201 on one side of the diaphragm seat 2, and the guide members 202 extend in a direction away from the diaphragm seat 2. A groove 203 is formed between the diaphragm seat 2 and the guide members 202. A connector 204 is provided on the other side of the diaphragm seat 2. The diaphragm 3 is installed in the groove 203 and is coaxially arranged with the air hole 201.

[0024] The diaphragm 3 is fixed to the diaphragm seat 2 by the groove 203, which greatly simplifies the assembly process, eliminates the riveting step, and improves production efficiency and consistency. The protruding guide 202 can extend into the valve cavity of the valve body 4, providing precise axial guidance and radial limiting for the up-and-down reciprocating motion of the entire diaphragm assembly 1. This effectively prevents the diaphragm 3 from deflecting or twisting during operation, ensuring that the sealing surface of the diaphragm 3 can always be aligned and fitted with the sealing surface of the valve port 403. This greatly improves the reliability and consistency of the seal. The stable guidance avoids abnormal wear of the diaphragm 3, and the high repeatability of the sealing pair due to the constrained movement trajectory significantly extends the service life of the diaphragm 3 and the entire solenoid valve. The integration of the guiding function, the fixing function of the diaphragm 3, and the connection function with the moving iron core 6 into a single diaphragm seat 2 component reduces the number of parts, lowers costs, and reduces potential leakage points. Through the integrated guiding and fixing design, the effects of simplified assembly, stable guidance, improved sealing, and extended service life are effectively achieved.

[0025] In some embodiments of this utility model, such as Figure 3 As shown, one side of the diaphragm 3 is concave inward to form an arc-shaped region 301. The arc-shaped region 301 and the guide member 202 face the same side, and the end of the arc-shaped region 301 near the air hole 201 abuts against the guide member 202.

[0026] When a traditional planar diaphragm 3 is opened, the airflow channel below it is relatively narrow and may generate turbulence, which to some extent limits the flow efficiency of the medium. Furthermore, the diaphragm 3 lacks effective guidance and support when deforming. The concave area of ​​the arc-shaped region 301 and the contact point with the guide member 202 form additional guidance and support points, further constraining the non-axial deformation of the diaphragm 3 under high pressure differential or frequent opening and closing conditions, and enhancing the smoothness of movement. When the diaphragm 3 is opened, the arc-shaped structure naturally forms a flared flow channel, which significantly increases the effective flow cross-sectional area of ​​the gas, reduces flow resistance and pressure loss, thereby improving the flow capacity and response speed of the solenoid valve, and realizing the synergistic optimization of guiding function and fluid performance.

[0027] Based on the above embodiments, such as Figure 4 As shown, a protrusion 302 is provided on one side of the diaphragm 3 opposite to the arc-shaped area 301. The protrusion 302 is close to the air hole 201 and surrounds the air hole 201. The protrusion 302 abuts against the connector 204.

[0028] The protrusion 302 is equivalent to adding an annular sealing rib to the contact surface between the diaphragm 3 and the connector 204. When the diaphragm 3 is installed on the diaphragm seat 2 through the groove 203, the protrusion 302 makes an interference contact with the end face of the connector 204 under the elastic action of the material, forming a solid radial or end face static seal. This not only significantly enhances the sealing integrity of the diaphragm assembly 1 itself and ensures the stable establishment and release of the pilot pressure, but also optimizes the distribution of sealing force from a structural perspective by its layout around the vent 201, making the seal more uniform and reliable.

[0029] In some embodiments of this utility model, such as Figure 4 As shown, a limiting strip 303 is provided along the circumferential direction on the edge of the diaphragm 3, with the limiting strip 303 facing the side of the connector 204.

[0030] The limiting strip 303 is matched with the corresponding slots on the valve body 4 and the pressure plate 5. During assembly, the limiting strip 303 is first embedded in the valve body 4, providing crucial initial radial positioning for the entire diaphragm assembly 1, ensuring its alignment with the valve port 403 and simplifying the assembly process. After the pressure plate 5 is pressed and fixed, the upper surface of the limiting strip 303, facing the connector 204, abuts tightly against the pressure plate 5, providing a rigid mechanical constraint against any unintended radial movement or deflection that may occur during the operation of the diaphragm assembly 1. This strictly limits the movement of the diaphragm 3 to the designed axial path, effectively preventing misalignment of the sealing pair due to pressure fluctuations or vibrations, and greatly improving the stability of the diaphragm 3's operation and the repeatability of the seal.

[0031] In some embodiments of this utility model, such as Figure 5 As shown, the connector 204 has a through-hole at the center, and a slot 2041 is formed at one end of the connector 204 near the diaphragm 3.

[0032] During assembly, the moving iron core 6 can be moved laterally and directly inserted into the slot 2041, which is extremely convenient and achieves rapid snap-fit ​​installation, significantly improving assembly efficiency. Moreover, the slot 2041 does not rigidly fix the moving iron core 6, but forms a floating connection. The slot 2041 has sufficient depth in the axial direction, providing the necessary space for the axial movement of the moving iron core 6 during the energized engagement and de-energized reset process, without affecting its normal stroke. It can move up and down in the slot 2041 according to the working requirements. The inner wall of the slot 2041 forms an effective radial constraint on the end of the moving iron core 6, reliably limiting the unexpected movement of the moving iron core 6 in any direction in the horizontal plane, ensuring that the axis of motion of the moving iron core 6 is always consistent with the center line of the air hole 201 and the air nozzle 2011, thereby ensuring the precise alignment of the sealing pair between the rubber plug 7 and the air nozzle 2011.

[0033] In some embodiments of this utility model, such as Figure 3As shown, an air nozzle 2011 is provided on the side of the air hole 201 near the connector 204, and the air nozzle 2011 protrudes towards the side of the connector 204.

[0034] The protruding end of the air nozzle 2011, with a surface that can be a smooth plane or a slightly convex arc, combined with the elastic material at the end of the rubber plug 7, effectively transforms the traditional line contact into a more stable and wider annular contact surface. This not only significantly increases the effective sealing area and reduces the pressure per unit area, thereby reducing the relaxation of compressive stress in the rubber plug 7 material, extending its service life, but also reduces the requirement for coaxiality between the moving iron core 6 and the air nozzle 2011. Even if there is a slight amount of wobble in the moving iron core 6 after long-term operation, the protruding air nozzle 2011 structure can ensure that the rubber plug 7 can accurately cover and press against the end face of the air nozzle 2011 during reset, thanks to its increased guiding effect and contact tolerance, reducing the risk of internal leakage caused by slight misalignment.

[0035] This utility model also provides a pilot-operated solenoid valve, such as Figures 6-8 As shown, it includes: The valve body 4 has an air inlet 401 on one side and an air outlet 402 on the other side, and a valve port 403 in the middle, which connects the air inlet 401 and the air outlet 402. The diaphragm assembly 1 is mounted on the valve body 4 and includes a diaphragm seat 2 and a diaphragm 3. The guide 202 extends into the valve port 403 and the air hole 201 is opposite to the valve port 403. Pressure plate 5 is set on valve body 4 and abuts against limit strip 303. Pressure plate 5 has a center hole. The moving iron core 6 is mounted on the diaphragm assembly 1, with one end extending into the slot 2041. The slot 2041 has space for the moving iron core 6 to move in the direction of approaching or moving away from the diaphragm 3 within the slot 2041. The rubber plug 7 is placed between the moving iron core 6 and the air nozzle 2011; The stationary iron core 8 is installed on the side of the moving iron core 6 away from the diaphragm assembly 1 and is coaxially arranged with the moving iron core 6; Spring 9 is installed between the moving iron core 6 and the stationary iron core 8; The magnetic shielding tube 10 is sleeved on the moving iron core 6 and extends toward the stationary iron core 8; The coil assembly 11 is sleeved on the magnetic shielding tube 10, and one inner wall abuts against the stationary iron core 8. The coil assembly 11, the pressure plate 5 and the valve body 4 can be fixed together by multiple screws and other fasteners that connect the three parts.

[0036] Multiple guide members 202 on the diaphragm seat 2 extend into the valve cavity of the valve body 4, leaving a gap between the guide members 202 and the inner wall of the valve cavity for medium flow. Simultaneously, they provide precise axial guidance and radial limiting for the up-and-down movement of the diaphragm assembly 1, ensuring stable movement trajectory. The air hole 201 at the center of the diaphragm seat 2 is vertically aligned with the valve port 403. The pressure plate 5 is fixed to the valve body 4 by screws and other fasteners. Its lower surface abuts against the upper surface of the limiting strip 303 on the diaphragm 3, pressing and fixing the diaphragm assembly 1 within the valve body 4. Simultaneously, the limiting strip 303, in cooperation with the valve body 4, prevents radial movement. The pressure plate 5 has a through hole at its center, providing space for the movement of the moving iron core 6. The moving iron core 6 is installed above the diaphragm assembly 1, with its lower end extending into the slot 2041 on the connector 204 of the diaphragm seat 2. The core 6 can float radially within a certain range within the slot 2041 to accommodate assembly errors and ensure alignment. The slot 2041 also has sufficient axial depth to provide the necessary axial movement space for the moving iron core 6. The rubber plug 7, made of elastic material, is placed between the lower end of the moving iron core 6 and the air nozzle 2011 on the diaphragm seat 2 to seal the pilot airflow channel. The stationary iron core 8 is fixedly installed above the moving iron core 6 via a magnetic shielding tube 10 and other structures, and is coaxially arranged with the moving iron core 6. The spring 9 is always in a compressed state, providing a downward restoring force for the moving iron core 6. The magnetic shielding tube 10 is sleeved outside the moving iron core 6, with one end preferably abutting against the pressure plate 5. A sealing ring 12 can be provided between the two to prevent medium leakage. The coil assembly 11 is sleeved outside the magnetic shielding tube 10, and generates an electromagnetic field when energized.

[0037] When the coil assembly 11 is de-energized, the moving iron core 6 is in the lower position under the restoring force of the spring 9. It tightly seals the air nozzle 2011 on the diaphragm seat 2 through the rubber plug 7, and the pilot airflow channel is closed. The medium pressure of the air inlet 401 acts on the lower part of the diaphragm 3 through the balance hole or gap on the diaphragm 3. At the same time, the medium slowly fills the upper cavity of the diaphragm 3, i.e. the pilot cavity, through the throttling hole and other means. Due to the difference in the effective working area of ​​the upper and lower parts of the diaphragm 3, as well as the combined action of the spring 9 force and the medium pressure, the diaphragm 3 is pressed tightly on the valve port 403, and the main valve is in the closed state.

[0038] When the coil assembly 11 is energized, it attracts the moving iron core 6 to move upward against the force of the spring 9. Under the guidance of the slot 2041, the moving iron core 6 moves upward, causing the rubber plug 7 to leave the air nozzle 2011. The pilot valve port 403 is opened, and the medium in the upper cavity of the diaphragm 3, i.e. the pilot cavity, flows rapidly through the open pilot valve port 403, through the air hole 201 on the diaphragm seat 2, and the valve port 403 to the air outlet 402 to release pressure. Because the pressure in the upper cavity of the diaphragm 3 drops sharply, while the lower cavity of the diaphragm 3 is still at the inlet pressure, under this pressure difference, the diaphragm assembly 1 as a whole overcomes its deformation resistance and is lifted upward. The guide 202 slides and guides in the valve cavity, the main valve port 403 is opened, and the medium flows from the inlet port 401 to the outlet port 402 in a large flow rate. After the coil is de-energized, the electromagnetic force disappears, and the moving iron core 6 moves downward to reset under the action of the spring 9. It drives the rubber plug 7 to quickly press against the air nozzle 2011, closing the pilot valve port 403. The medium in the air inlet 401 slowly fills the upper cavity of the diaphragm 3 through the throttling orifice, causing its pressure to gradually rise. When the pressure in the upper cavity of the diaphragm 3 gradually approaches the pressure in the lower cavity, the diaphragm 3 bends downward under the action of its own elastic deformation recovery force and the pressure in the upper cavity. At the same time, the guide 202 guides it to fall back accurately, and finally it fits tightly against the valve port 403, closing the main valve and cutting off the flow of the medium.

[0039] In some embodiments of this utility model, such as Figure 8 As shown, one end of the magnetic shielding tube 10 abuts against the pressure plate 5. A sealing ring 12 is set between the magnetic shielding tube 10 and the pressure plate 5. The elastic deformation of the sealing ring 12 tightly fills the gap between the parts, blocking the medium between the valve body 4 and the moving iron core 6 from escaping along the contact surface between the magnetic shielding tube 10 and the pressure plate 5. This avoids the loss of medium affecting the stability of the system pressure and reduces the possibility of polluting the external environment or equipment.

[0040] In some embodiments of this utility model, such as Figure 8 As shown, a movable groove 601 is formed on the side of the moving iron core 6 near the stationary iron core 8. The spring 9 is placed in the movable groove 601, and the spring 9 abuts against the stationary iron core 8 and the moving iron core 6. The inner wall of the movable groove 601 provides circumferential radial limit for the spring 9, effectively preventing the spring 9 from radially moving, bending or twisting during compression and release, ensuring that the force of the spring 9 is always transmitted along the axial direction of the moving iron core 6, making the movement of the moving iron core 6 more stable and linear, greatly improving the reliability and repeatability of the action. It simplifies the assembly process. The spring 9 is pre-positioned in the movable groove 601, avoiding the problem of misalignment or falling off of the spring 9 when assembling components such as the magnetic shielding tube 10, improving assembly efficiency and consistency. By ensuring the centering and stability of the spring 9, the accuracy of the reset position of the moving iron core 6 is indirectly guaranteed, so that the rubber plug 7 at its lower end can accurately fall back onto the sealing surface of the air nozzle 2011 every time, thereby significantly improving the sealing reliability and overall life of the pilot valve.

[0041] In some embodiments of this utility model, such as Figure 8 As shown, a receiving cavity 602 is opened at the end of the moving iron core 6 facing the rubber plug 7, and the rubber plug 7 is embedded in the receiving cavity 602. The rubber plug 7 is firmly locked on the moving iron core 6 by mechanical containment, which effectively prevents it from loosening or shifting during frequent impact opening and closing actions, ensuring the reliability of the connection. The receiving cavity 602 forms a circumferential radial constraint on the root of the rubber plug 7, ensuring that the central axis of the rubber plug 7 coincides with the movement axis of the moving iron core 6. Thus, when the moving iron core 6 falls and resets, it can guide the rubber plug 7 to be vertically pressed against the sealing surface of the air nozzle 2011, which greatly improves and maintains the alignment and sealing consistency of the pilot sealing pair.

[0042] Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A guide diaphragm assembly, characterized in that, include: A diaphragm seat (2) has an air hole (201) in the center. Multiple guide members (202) are evenly spaced around the air hole (201) on one side of the diaphragm seat (2), and the guide members (202) extend in a direction away from the diaphragm seat (2). A groove (203) is formed between the diaphragm seat (2) and the guide members (202). A connector (204) is provided on the other side of the diaphragm seat (2). A diaphragm (3) is installed in the groove (203) and is coaxially arranged with the pore (201).

2. The guide diaphragm assembly according to claim 1, characterized in that, The diaphragm (3) is recessed inward on one side to form an arc-shaped area (301). The arc-shaped area (301) and the guide (202) face the same side. The end of the arc-shaped area (301) near the air hole (201) abuts against the guide (202).

3. The guide diaphragm assembly according to claim 2, characterized in that, The diaphragm (3) has a protrusion (302) on one side opposite to the arc-shaped area (301). The protrusion (302) is close to the air hole (201) and surrounds the air hole (201) for a period of time. The protrusion (302) abuts against the connector (204).

4. The guide diaphragm assembly according to claim 1, characterized in that, The edge of the diaphragm (3) is provided with a limiting strip (303) along the circumferential direction, and the limiting strip (303) faces the side of the connector (204).

5. The guide diaphragm assembly according to claim 4, characterized in that, The connector (204) has a through-hole at its center, and a slot (2041) is formed at one end of the connector (204) near the diaphragm (3).

6. The guide diaphragm assembly according to claim 1, characterized in that, An air nozzle (2011) is provided on the side of the air hole (201) near the connector (204), and the air nozzle (2011) protrudes toward the side of the connector (204).

7. A pilot-operated solenoid valve, characterized in that, The application of the guide diaphragm assembly as described in any one of claims 1 to 6 includes: The valve body (4) has an air inlet (401) on one side, an air outlet (402) on the other side, and a valve port (403) in the middle, wherein the valve port (403) connects the air inlet (401) and the air outlet (402). A diaphragm assembly (1) is mounted on the valve body (4) and includes the diaphragm seat (2) and the diaphragm (3). The guide (202) extends into the valve port (403) and the air hole (201) is opposite to the valve port (403). A pressure plate (5) is disposed on the valve body (4) and abuts against the limiting strip (303). The pressure plate (5) has a central hole. The moving iron core (6) is installed on the diaphragm assembly (1), with one end extending into the slot (2041). The slot (2041) has space for the moving iron core (6) to move in the slot (2041) toward or away from the diaphragm (3). A rubber plug (7) is placed between the moving iron core (6) and the air nozzle (2011); The stationary iron core (8) is installed on the side of the moving iron core (6) away from the diaphragm assembly (1) and is coaxially arranged with the moving iron core (6); A spring (9) is installed between the moving iron core (6) and the stationary iron core (8); A magnetic shielding tube (10) is sleeved on the moving iron core (6) and extends toward the stationary iron core (8); The coil assembly (11) is sleeved on the magnetic shielding tube (10), and one inner wall abuts against the stationary iron core (8).

8. The pilot-operated solenoid valve according to claim 7, characterized in that, One end of the magnetic shielding tube (10) abuts against the pressure plate (5), and a sealing ring (12) is provided between the magnetic shielding tube (10) and the pressure plate (5).

9. The pilot-operated solenoid valve according to claim 7, characterized in that, The moving iron core (6) has a movable groove (601) on the side near the stationary iron core (8), and the spring (9) is placed in the movable groove (601), and the spring (9) abuts against the stationary iron core (8) and the moving iron core (6).

10. The pilot-operated solenoid valve according to claim 7, characterized in that, The moving iron core (6) has a receiving cavity (602) at one end facing the rubber plug (7), and the rubber plug (7) is embedded in the receiving cavity (602).

Images