A proportional valve

Abstract

The utility model belongs to proportional valve technical field discloses a proportional valve. This proportional valve can simultaneously access three different cutting gas sources through setting three first air inlets, three first channels and corresponding three pressure reducing valves, three electromagnetic valves and three conducting assemblies; after the gas enters the pressure reducing valve for pressure reduction via the pilot air inlet, the electromagnetic valve is driven to act, and then the conducting assembly is controlled to make the corresponding first channel and second channel conduct, so that the pressure reduction and on-off control are independently realized through each gas circuit according to the processing requirement, realizing flexible, reliable switching and pressure regulation of three kinds of cutting gas. The proportional valve not only realizes multi-gas source integrated gas supply and one-key switching, improves the efficiency and flexibility of cutting operation, but also greatly reduces the dependence on external pilot gas source and the overall pipeline complexity, has the advantages of high integration, fast response, accurate control and application to multi-variety gas cutting scene.

Description

Technical Field

[0001] This utility model relates to the field of proportional valve technology, and in particular to a proportional valve. Background Technology

[0002] In the fields of industrial automation and fluid control, proportional valves are a key actuator, widely used in applications requiring precise regulation of gas pressure, such as in gas cutting processes. Traditional proportional valves typically employ a single electromagnet-driven valve core structure, adjusting the valve opening by changing the current to achieve proportional control of the output pressure.

[0003] Currently, existing multi-port proportional valves typically rely on an external pilot air source as the switching drive for the solenoid valve. This increases the system's dependence on external air sources, limiting the valve's application in situations where air supply is inconvenient. Furthermore, it leads to complex external piping connections and inconvenient installation. In addition, the need for additional pilot air circuits and related components results in low overall structural integration and high manufacturing costs, while also exhibiting shortcomings in multi-port coordinated control and response consistency. Utility Model Content

[0004] The purpose of this utility model is to provide a proportional valve to solve the problems of inconvenient installation, complex structure, low integration and high cost caused by the need for an external pilot air source in existing proportional valves, and to improve the ease of use, internal structure integration and consistency of multi-channel control of proportional valves.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A proportional valve, comprising:

[0007] An air intake device includes a first valve seat assembly, three pressure reducing valves, three solenoid valves, and three connecting assemblies. The first valve seat assembly has three first channels, three pilot channels, and one second channel. The three first channels are respectively connected to the second channels. Each first channel has a first air inlet, and each second channel has a first air outlet. The pilot channels are arranged one-to-one with the first channels. Each pilot channel has a pilot air inlet and a pilot air outlet at both ends, and both are connected to the corresponding first channel. Each pilot channel has a pressure reducing valve and a solenoid valve arranged sequentially from the pilot air inlet to the pilot air outlet. Each connecting assembly is disposed in the corresponding first channel and is connected to the corresponding pilot air outlet. Gas can pass sequentially through the pressure reducing valve and the solenoid valve to connect the connecting assembly and make the first channel connected to the second channel.

[0008] The valve body device includes a second valve seat assembly, a first electromagnet, and a first valve core. The second valve seat assembly has a third channel with a second air inlet and a second air outlet. The second air inlet is connected to the first air outlet. The first valve core is disposed in the third channel. The first electromagnet is connected to the first valve core and is used to adjust the opening of the first valve core to control the gas pressure at the second air outlet.

[0009] As an alternative to a proportional valve, the inner wall of the first channel is provided with an inwardly protruding inner extension; the conduction assembly includes:

[0010] A fixing ring, the outer circumference of which is fixedly connected to the inner wall of the first channel;

[0011] A guide rod is disposed within the first channel, passing through the fixing ring and the inner extension, and slidably and sealingly connected to both. The outer circumference of the guide rod has an outwardly protruding extension located between the fixing ring and the inner extension, and the outer circumference of the extension is slidably and sealingly connected to the inner wall of the first channel. A first chamber is formed between the fixing ring and the extension, and a second chamber is formed between the inner extension and the extension. The second chamber is connected to the corresponding first outlet vent. The guide rod has a through first hole along its axial direction.

[0012] The sealing member is fixedly connected to the inner wall of the first channel on its outer periphery. The sealing member is provided with a through second hole along the axial direction. A third chamber is formed between the sealing member and the inner extension. The second through hole connects the third chamber and the second channel. The guide rod can move along its axial direction to make the first through hole connect or disconnect from the third chamber.

[0013] As an alternative to the proportional valve, the conduction assembly also includes a compression spring sleeved on the guide rod and located in the first chamber, with its two ends abutting against the extension and the retaining ring, respectively.

[0014] As an alternative to the proportional valve, the conduction assembly also includes a first sealing ring. The inner wall of the fixing ring is provided with an annular first sealing groove. The first sealing ring is disposed in the first sealing groove and slides and seals with the outer surface of the guide rod.

[0015] As an alternative to the proportional valve, the conduction assembly also includes a second sealing ring. The outer periphery of the extension is provided with an annular second sealing groove. The second sealing ring is disposed in the second sealing groove and slides and seals with the inner wall of the first channel.

[0016] As an alternative to the proportional valve, the conduction assembly also includes a third sealing ring. The inner wall of the inner extension is provided with an annular third sealing groove. The third sealing ring is disposed in the third sealing groove and slides and seals with the outer surface of the guide rod.

[0017] As an alternative to a proportional valve, the first valve seat assembly includes a first seat body, a second seat body, and a third seat body connected in sequence. The first channel passes through the first seat body and the second seat body, and the second channel passes through the third seat body. The connecting component is disposed inside the second seat body and is located at the docking and communication point between the first channel and the second channel.

[0018] As an alternative to a proportional valve, the first valve seat assembly includes a first fastener and a second fastener, the first fastener passing through the first seat body and threadedly connected to the second seat body, and the second fastener passing through the third seat body and threadedly connected to the second seat body.

[0019] As an alternative to the proportional valve, the proportional valve also includes a third fastener that passes through the first valve seat assembly and is threadedly connected to the second valve seat assembly.

[0020] As an alternative to a proportional valve, the valve body device further includes a second electromagnet, a second valve core, and an internal plug check valve. The second valve seat assembly is also provided with a pressure relief channel, which is connected to the third channel. The second valve core is movably disposed in the pressure relief channel, and the second electromagnet is connected to the second valve core to drive the second valve core to open or close the pressure relief channel. The second valve seat assembly is provided with the internal plug check valve, which is disposed in the circuit board connection chamber.

[0021] Beneficial effects:

[0022] This invention provides a proportional valve that, by setting three first air inlets, three first channels, and corresponding three pressure reducing valves, three solenoid valves, and three connecting components, can simultaneously connect to three different cutting gas sources. Gas enters the pressure reducing valve through the pilot air inlet for pressure reduction, then drives the solenoid valve to actuate, thereby controlling the connecting components to connect the corresponding first and second channels. This allows for independent pressure reduction and on / off control of each gas path according to processing requirements, achieving flexible and reliable switching and pressure regulation of the three cutting gases. This proportional valve not only realizes integrated gas supply from multiple sources and one-button switching, improving the efficiency and flexibility of cutting operations, but also significantly reduces dependence on external pilot gas sources and overall pipeline complexity. It has the advantages of high integration, fast response, precise control, and applicability to various gas cutting scenarios. Attached Figure Description

[0023] Figure 1 This is a first schematic diagram of the proportional valve provided in this embodiment of the utility model;

[0024] Figure 2 This is a second schematic diagram of the proportional valve provided in this embodiment of the utility model;

[0025] Figure 3 yes Figure 2A cross-sectional view of position AA in the middle;

[0026] Figure 4 yes Figure 3 A magnified view of the area at position C in the middle;

[0027] Figure 5 yes Figure 2 A cross-sectional view of the BB position.

[0028] In the picture:

[0029] 11. First valve seat assembly; 111. First channel; 112. Second channel; 113. Pilot channel; 114. First seat body; 115. Second seat body; 116. Third seat body; 117. First fastener; 118. First housing; 1111. First air inlet; 1112. Inner extension; 1121. First air outlet; 1131. Pilot air inlet; 1132. Pilot air outlet; 11121. Third sealing groove;

[0030] 12. Pressure reducing valve; 13. Solenoid valve;

[0031] 14. Conducting assembly; 141. Retaining ring; 142. Guide rod; 143. Abutment seal; 144. Compression spring; 145. First sealing ring; 146. Second sealing ring; 147. Third sealing ring; 1411. First sealing groove; 1421. Extension; 1422. First through hole; 14211. Second sealing groove; 1431. Second through hole;

[0032] 15. First chamber; 16. Second chamber; 17. Third chamber;

[0033] 21. Second valve seat assembly; 22. First electromagnet; 23. First valve core; 24. Second electromagnet; 25. Second valve core; 26. Internal plug check valve; 211. Third channel; 212. Pressure relief channel; 213. Fourth seat; 214. Second housing; 2111. Second air inlet; 2112. Second air outlet; 2121. Pressure relief port;

[0034] 3. The third fastener. Detailed Implementation

[0035] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0036] In the description of this utility model, unless otherwise expressly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part of the device. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0037] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0038] In the description of this embodiment, the terms "upper" and "lower," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0039] This embodiment provides a proportional valve, such as Figures 1-5As shown, the proportional valve includes an intake device and a valve body. The intake device includes a first valve seat assembly 11, three pressure reducing valves 12, three solenoid valves 13, and three conducting assemblies 14. The first valve seat assembly 11 has three first channels 111, three pilot channels 113, and one second channel 112. The three first channels 111 are respectively connected to the second channel 112. Each first channel 111 has a first air inlet 1111 at the end opposite to the second channel 112, and the second channel 112 has a first air outlet 1121 at the end opposite to the first channel 111. The pilot channels 113 are arranged one-to-one with the first channels 111. Each pilot channel 113 has a pilot air inlet 1131 and a pilot air outlet 1132 at both ends, and both are connected to the corresponding first channel 111. The pilot air inlet 1131 is closer to the first air inlet 1111, and the pilot air outlet 1132 is farther away from the first air inlet 1111. A pressure reducing valve 12 and a solenoid valve 13 are sequentially arranged in the pilot channel 113 from the pilot inlet 1131 to the pilot outlet 1132. Each connecting component 14 is arranged in the corresponding first channel 111 and is connected to the corresponding pilot outlet 1132. Gas can pass through the pressure reducing valve 12 and the solenoid valve 13 in sequence to open the connecting component 14 and connect the first channel 111 with the second channel 112. The valve body device includes a second valve seat assembly 21, a first electromagnet 22 and a first valve core 23. The second valve seat assembly 21 is provided with a third channel 211. The third channel 211 is provided with a second inlet 2111 and a second outlet 2112. The second inlet 2111 is connected to the first outlet 1121. The first valve core 23 is movably arranged in the third channel 211. The first electromagnet 22 is connected to the first valve core 23 and is used to adjust the opening of the first valve core 23 to control the gas pressure of the second outlet 2112.

[0040] This proportional valve, by setting three first air inlets 1111, three first channels 111, and corresponding three pressure reducing valves 12, three solenoid valves 13, and three connecting components 14, can simultaneously connect to three different cutting gas sources. After the gas enters the pressure reducing valve 12 through the pilot air inlet 1131 for pressure reduction, it drives the solenoid valve 13 to actuate, thereby controlling the connecting component 14 to connect the corresponding first channel 111 and second channel 112. Thus, pressure reduction and on / off control are achieved independently through each gas path according to processing requirements, enabling flexible and reliable switching and pressure regulation of the three cutting gases. This proportional valve not only achieves integrated gas supply from multiple sources and one-button switching, improving the efficiency and flexibility of cutting operations, but also significantly reduces dependence on external pilot gas sources and overall pipeline complexity. It has the advantages of high integration, fast response, precise control, and applicability to various gas cutting scenarios.

[0041] In this embodiment, the first air inlets 1111 of the three first channels 111 are respectively used to introduce air, nitrogen, and oxygen, and can be switched to the corresponding gas according to different cutting process requirements. In addition, the gases can also be mixed in the second channel 112, for example, nitrogen can be mixed with air to form a mixed gas suitable for specific cutting requirements.

[0042] like Figures 3-4 As shown, the inner wall of the first channel 111 is provided with an inwardly protruding inner extension 1112; the conductive assembly 14 includes a fixing ring 141, a guide rod 142, and an abutment seal 143. The outer periphery of the fixing ring 141 is fixedly connected to the inner wall of the first channel 111; the guide rod 142 is disposed in the first channel 111, passing through the fixing ring 141 and the inner extension 1112, and is slidably and sealingly connected with both; the outer periphery of the guide rod 142 is provided with an outwardly protruding outer extension 1421, the outer extension 1421 is located between the fixing ring 141 and the inner extension 1112, and the outer periphery of the outer extension 1421 is slidably and sealingly connected to the inner wall of the first channel 111; a first chamber 15 is formed between the fixing ring 141 and the outer extension 1421, and between the inner extension 1112 and the outer extension 1421. A second chamber 16 is formed, which is connected to the corresponding first outlet 1132. The guide rod 142 is provided with a through hole 1422 along its axial direction. The outer periphery of the abutting seal 143 is fixedly connected to the inner wall of the first channel 111. The abutting seal 143 is provided with a through hole 1431 along its axial direction. A third chamber 17 is formed between the abutting seal 143 and the inner extension 1112. The second through hole 1431 connects the third chamber 17 and the second channel 112. The guide rod 142 can move along its axial direction to make the first through hole 1422 connect or disconnect the third chamber 17. When the pilot gas enters the second chamber 16 through the pilot outlet 1132 and pushes the extension 1421, the guide rod 142 moves axially, causing the guide rod 142 and the contact seal 143 to change from a tightly abutting sealed state to a separated state. This allows the high-pressure gas to enter the second channel 112 from the first channel 111 through the first through hole 1422, the third chamber 17, and the second through hole 1431, completing the conduction. This structure utilizes the combination of air pressure and mechanical structure, resulting in rapid response, good sealing performance, and independent and precise control of different air intake channels. It enhances the stability and reliability of the proportional valve in multi-source switching and mixed use.

[0043] like Figure 4As shown, the conduction assembly 14 also includes a compression spring 144, which is sleeved on the guide rod 142 and located in the first chamber 15. Its two ends abut against the extension portion 1421 and the fixing ring 141, respectively. With the addition of the compression spring 144, the conduction assembly 14 gains mechanical reset capability on top of the original pneumatic drive. When the pilot gas enters the second chamber 16 and pushes the extension portion 1421, the guide rod 142 compresses the compression spring 144, generating axial displacement and achieving conduction. When the pilot gas pressure disappears, the compression spring 144 releases its elastic force, pushing the extension portion 1421 and the guide rod 142 back to their original positions, quickly cutting off the airflow. This structure, utilizing the combination of pneumatic drive and the reset of the compression spring 144, significantly improves the response speed and sealing performance of the guide rod 142, avoiding closing delays or leaks caused by residual gas pressure, and enhancing the reliability and durability of the conduction assembly 14 under frequent start-stop conditions.

[0044] like Figures 3-4 As shown, the conductive assembly 14 also includes a first sealing ring 145. The inner wall of the fixing ring 141 is provided with an annular first sealing groove 1411. The first sealing ring 145 is disposed in the first sealing groove 1411 and slides and seals with the outer surface of the guide rod 142. By setting the first sealing ring 145, the conductive assembly 14 forms a reliable dynamic sealing interface between the fixing ring 141 and the guide rod 142. The first sealing ring 145 is embedded in the sealing groove of the inner wall of the fixing ring 141 and maintains continuous sliding sealing contact with the outer surface of the guide rod 142, effectively isolating gas leakage between the first chamber 15 and the external environment. This structure not only reduces the frictional resistance of the guide rod 142 during reciprocating motion and ensures the flexibility of operation, but also significantly improves the sealing reliability of the first chamber 15 under high pressure conditions, avoiding the impact of pressure loss on driving performance, thereby ensuring the stability and service life of the conductive assembly 14 during frequent switching processes.

[0045] like Figures 3-4As shown, the conductive assembly 14 also includes a second sealing ring 146. An annular second sealing groove 14211 is provided on the outer periphery of the extension portion 1421. The second sealing ring 146 is disposed within the second sealing groove 14211 and slides in a sealing engagement with the inner wall of the first channel 111. By providing the second sealing ring 146, the conductive assembly 14 forms an effective dynamic sealing interface between the extension portion 1421 and the inner wall of the first channel 111. The second sealing ring 146 is embedded in the second sealing groove 14211 on the outer periphery of the extension portion 1421 and maintains sliding sealing contact with the inner wall of the first channel 111, ensuring reliable isolation between the second chamber 16 and adjacent chambers. This structure not only maintains a stable sealing state during the axial movement of the guide rod 142, preventing high-pressure gas leakage, but also reduces the frictional resistance between the extension portion 1421 and the channel wall, ensuring the smoothness and responsiveness of the guide rod 142's movement, thereby further improving the sealing performance and operational reliability of the entire conductive assembly 14 under high pressure and frequent operation conditions.

[0046] like Figures 3-4 As shown, the conductive assembly 14 also includes a third sealing ring 147. The inner wall of the inner extension 1112 is provided with an annular third sealing groove 11121. The third sealing ring 147 is disposed in the third sealing groove 11121 and slides and seals with the outer surface of the guide rod 142. By setting the third sealing ring 147, the conductive assembly 14 forms another reliable dynamic sealing interface between the inner extension 1112 and the guide rod 142. The third sealing ring 147 is embedded in the third sealing groove 11121 on the inner wall of the inner extension 1112 and maintains sliding sealing contact with the outer surface of the guide rod 142, effectively isolating gas flow between the second chamber 16 and the third chamber 17. This structure further enhances the sealing independence of each chamber under high pressure conditions, prevents control failure due to pressure interference, and ensures the centering and smooth operation of the guide rod 142 in reciprocating motion, reducing the risk of uneven wear, thereby improving the overall sealing reliability and long service life of the conductive assembly 14 under complex pressure conditions.

[0047] In this embodiment, the first sealing ring 145, the second sealing ring 146, and the third sealing ring 147 are all made of polytetrafluoroethylene or fluororubber.

[0048] In this embodiment, taking one of the first channels 111 as an example, the working process of the air intake device is roughly as follows: high-pressure gas enters the first channel 111 through the first air inlet 1111, and a part of the gas enters the corresponding pilot channel 113 through the pilot air inlet 1131. After being depressurized by the pressure reducing valve 12, it drives the solenoid valve 13 to operate. After the solenoid valve 13 opens, the depressurized gas enters the first outlet air outlet 1132 and flows into the second chamber 16 of the conduction component 14. Under the action of gas pressure, the guide rod 142 overcomes the resistance of the compression spring 144 and moves axially, so that the guide rod 142 and the abutting seal 143 change from a tightly abutting state to a separated state. At this time, the high-pressure gas in the first channel 111 enters the second channel 112 through the first through hole 1422 of the guide rod 142, the third chamber 17 and the second through hole 1431 of the abutting seal 143, and is finally output from the first outlet 1121, completing the conduction of the airflow.

[0049] like Figures 3-5 As shown, the first valve seat assembly 11 includes a first seat body 114, a second seat body 115, and a third seat body 116 connected in sequence. A first channel 111 passes through the first seat body 114 and the second seat body 115, and a second channel 112 passes through the third seat body 116. A connecting component 14 is disposed inside the second seat body 115 and located at the connection point between the first channel 111 and the second channel 112. The first valve seat assembly 11 adopts a split structure in which the first seat body 114, the second seat body 115, and the third seat body 116 are connected in sequence. The first channel 111 passes through the first seat body 114 and the second seat body 115, the second channel 112 is disposed in the third seat body 116, and the connecting component 14 is installed inside the second seat body 115 and located at the connection point between the first channel 111 and the second channel 112. This structure achieves a modular layout of complex gas paths through the combination of multiple seats, which facilitates the processing and assembly of each channel and internal component, improves the structural strength and sealing reliability of the first valve seat assembly 11, and enables the conduction assembly 14 to be accurately positioned at the gas path intersection node, ensuring smooth airflow switching and effective sealing, thereby improving the manufacturability and maintenance convenience of the entire proportional valve.

[0050] In this embodiment, both the retaining ring 141 and the abutment seal 143 are fixed to the inner wall of the first channel 111 of the second seat 115 by a threaded connection. Simultaneously, one end of the retaining ring 141 abuts against the first seat 114, and one end of the abutment seal 143 abuts against the third seat 116, jointly achieving axial positioning. This structure, through a combination of threaded connection and abutment, ensures that the retaining ring 141 and the abutment seal 143 remain firmly installed under airflow, effectively preventing component movement or seal failure due to pressure fluctuations. This improves the stability and reliability of the conductive assembly 14, while simplifying the assembly process and facilitating maintenance and replacement.

[0051] like Figure 1 As shown, the first valve seat assembly 11 includes a first fastener 117 and a second fastener (not shown). The first fastener 117 passes through the first seat body 114 and is threadedly connected to the second seat body 115. The second fastener passes through the third seat body 116 and is threadedly connected to the second seat body 115. The first valve seat assembly 11 achieves a reliable connection between the seats through the first fastener 117 and the second fastener. This connection structure not only ensures a tight fit and axial compression between the first seat body 114, the second seat body 115, and the third seat body 116, effectively enhancing the overall rigidity and sealing performance of the first valve seat assembly 11 and preventing high-pressure gas leakage, but also simplifies the assembly and disassembly process, facilitates the maintenance and replacement of internal components, and improves the structural stability and service life of the proportional valve.

[0052] like Figure 1 As shown, the proportional valve also includes a third fastener 3, which passes through the first valve seat assembly 11 and is threadedly connected to the second valve seat assembly 21. This structure achieves a compact and reliable connection between the air intake device and the valve body, ensuring the sealing of the connecting air passage between the two parts, preventing gas leakage at the interface, while enhancing the overall rigidity and vibration resistance of the valve body, and improving the working stability and service life of the proportional valve under high pressure or pulse conditions.

[0053] In this embodiment, as Figure 1 As shown, the first valve seat assembly 11 also includes a first housing 118, which is connected to the first seat body 114, the second seat body 115, and the third seat body 116, and covers the upper part of the three to protect the internal pressure reducing valve 12, solenoid valve 13, and air circuit connection components. This top-covering structure not only effectively protects against the intrusion of external dust, oil, and other contaminants, maintaining the cleanliness and normal working condition of internal components, but also improves the overall aesthetics and structural integrity of the valve body, while facilitating daily maintenance and centralized connection of external air circuits.

[0054] like Figure 5As shown, the valve body assembly also includes a second electromagnet 24, a second valve core 25, and an internal plug check valve 26. The second valve seat assembly 21 also has a pressure relief channel 212, which is connected to the third channel 211. The second valve core 25 is movably disposed within the pressure relief channel 212. The second electromagnet 24 is connected to the second valve core 25 and is used to drive the second valve core 25 to open or close the pressure relief channel 212. The second valve seat assembly 21 has an internal plug check valve 26, which is located in the circuit board connection chamber. The second valve core 25 is driven by the second electromagnet 24 within the pressure relief channel 212, allowing precise control of the opening and closing of the pressure relief channel 212. One end of the pressure relief channel 212 has a pressure relief port 2121. This structure allows the proportional valve to quickly release excessive pressure in the third channel 211 when needed, effectively preventing valve core jamming, sealing failure, or system fluctuations caused by pressure accumulation. This improves the safety and reliability of the proportional valve under high pressure or sudden flow changes, while also enhancing the overall system's regulation margin and stability.

[0055] In this embodiment, as Figure 1 As shown, the second valve seat assembly 21 includes a fourth seat body 213 and a second housing 214. The fourth seat body 213 has a third channel 211. The second housing 214 is connected to the fourth seat body 213 and covers its upper part. The second valve seat assembly 21 achieves an organic combination of function and protection through the separate structure of the fourth seat body 213 and the second housing 214. The third channel 211 inside the fourth seat body 213 provides precise guidance and airflow passage for the valve core movement, while the upper second housing 214 effectively isolates external dust, moisture, and other contaminants, ensuring the cleanliness and reliable operation of the internal mechanism. This design not only improves the overall sealing performance and environmental adaptability of the valve body, but also facilitates inspection, maintenance, and installation and debugging of the electromagnet. It also enhances structural rigidity and aesthetics, contributing to improved service life and stability of the proportional valve in complex industrial environments.

[0056] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A proportional valve, characterized in that, include: The air intake device (1) includes a first valve seat assembly (11), three pressure reducing valves (12), three solenoid valves (13), and three conducting assemblies (14). The first valve seat assembly (11) is provided with three first channels (111), three pilot channels (113), and one second channel (112). The three first channels (111) are respectively connected to the second channel (112). Each first channel (111) is provided with a first air inlet (1111), and the second channel (112) is provided with a first air outlet (1121). The pilot channels (113) are arranged one-to-one with the first channels (111), and each pilot channel (113) has a first air outlet (1121) at both ends. The system is provided with a pilot air inlet (1131) and a pilot air outlet (1132), both of which are connected to the corresponding first channel (111). Each pilot channel (113) is provided with a pressure reducing valve (12) and a solenoid valve (13) sequentially from the pilot air inlet (1131) to the pilot air outlet (1132). Each connecting component (14) is disposed in the corresponding first channel (111) and is connected to the corresponding pilot air outlet (1132). Gas can pass through the pressure reducing valve (12) and the solenoid valve (13) sequentially to connect the connecting component (14) and make the first channel (111) and the second channel (112) connected. The valve body device (2) includes a second valve seat assembly (21), a first electromagnet (22), and a first valve core (23). The second valve seat assembly (21) is provided with a third channel (211). The third channel (211) is provided with a second air inlet (2111) and a second air outlet (2112). The second air inlet (2111) is connected to the first air outlet (1121). The first valve core (23) is disposed in the third channel (211). The first electromagnet (22) is connected to the first valve core (23) and is used to adjust the opening of the first valve core (23) to control the gas pressure of the second air outlet (2112).

2. The proportional valve according to claim 1, characterized in that, The inner wall of the first channel (111) is provided with an inwardly protruding inner extension (1112); the conductive assembly (14) includes: A fixing ring (141) is fixedly connected to the inner wall of the first channel (111) on its outer periphery; A guide rod (142) is disposed in the first channel (111). The guide rod (142) passes through the fixing ring (141) and the inner extension (1112) and is slidably and sealingly connected to both. The outer circumference of the guide rod (142) is provided with an outwardly protruding outer extension (1421). The outer extension (1421) is located between the fixing ring (141) and the inner extension (1112). The outer circumference of the outer extension (1421) is slidably and sealingly connected to the inner wall of the first channel (111). A first chamber (15) is formed between the fixing ring (141) and the outer extension (1421). A second chamber (16) is formed between the inner extension (1112) and the outer extension (1421). The second chamber (16) is connected to the corresponding first outlet vent (1132). The guide rod (142) is provided with a through hole (1422) along its axial direction. An abutting seal (143) is fixedly connected to the inner wall of the first channel (111) on its outer periphery. The abutting seal (143) is provided with a through second hole (1431) along the axial direction. A third chamber (17) is formed between the abutting seal (143) and the inner extension (1112). The second through hole (1431) connects the third chamber (17) and the second channel (112). The guide rod (142) can move along its axial direction so that the first through hole (1422) is connected to or cut off the third chamber (17).

3. The proportional valve according to claim 2, characterized in that, The conductive assembly (14) also includes a compression spring (144), which is sleeved on the guide rod (142) and located in the first chamber (15), with its two ends abutting against the extension (1421) and the fixing ring (141) respectively.

4. The proportional valve according to claim 2, characterized in that, The conductive assembly (14) further includes a first sealing ring (145). The inner wall of the fixing ring (141) is provided with an annular first sealing groove (1411). The first sealing ring (145) is disposed in the first sealing groove (1411) and slides and seals with the outer surface of the guide rod (142).

5. The proportional valve according to claim 2, characterized in that, The conductive component (14) further includes a second sealing ring (146). The outer periphery of the extension (1421) is provided with an annular second sealing groove (14211). The second sealing ring (146) is disposed in the second sealing groove (14211) and slides and seals with the inner wall of the first channel (111).

6. The proportional valve according to claim 2, characterized in that, The conductive assembly (14) further includes a third sealing ring (147). The inner wall of the inner extension (1112) is provided with an annular third sealing groove (11121). The third sealing ring (147) is disposed in the third sealing groove (11121) and slides and seals with the outer surface of the guide rod (142).

7. The proportional valve according to claim 1, characterized in that, The first valve seat assembly (11) includes a first seat body (114), a second seat body (115), and a third seat body (116) connected in sequence. The first channel (111) passes through the first seat body (114) and the second seat body (115), and the second channel (112) passes through the third seat body (116). The connecting component (14) is disposed inside the second seat body (115) and is located at the docking and communication point between the first channel (111) and the second channel (112).

8. The proportional valve according to claim 7, characterized in that, The first valve seat assembly (11) includes a first fastener (117) and a second fastener. The first fastener (117) passes through the first seat body (114) and is threadedly connected to the second seat body (115). The second fastener passes through the third seat body (116) and is threadedly connected to the second seat body (115).

9. The proportional valve according to claim 1, characterized in that, The proportional valve also includes a third fastener (3), which passes through the first valve seat assembly (11) and is threadedly connected to the second valve seat assembly (21).

10. The proportional valve according to any one of claims 1-9, characterized in that, The valve body device (2) further includes a second electromagnet (24), a second valve core (25), and an inner plug check valve (26). The second valve seat assembly (21) is also provided with a pressure relief channel (212), which is connected to the third channel (211). The second valve core (25) is movably disposed in the pressure relief channel (212). The second electromagnet (24) is connected to the second valve core (25) and is used to drive the second valve core (25) to open or close the pressure relief channel (212). The second valve seat assembly (21) is provided with the inner plug check valve (26), which is disposed in the circuit board connection chamber.

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