Stainless steel two-position three-way direct-acting anti-explosion electromagnetic valve

Abstract

The stainless steel two-position three-way direct-acting anti-explosion electromagnetic valve comprises a valve body, a cavity is formed in the valve body, a valve element assembly used for blocking the cavity is installed in the cavity in a sliding mode, a driving assembly and an ejector rod are installed above the valve body, and the ejector rod is located above the valve element assembly. The driving assembly is used for driving the ejector rod to push the valve element assembly to move downwards. A cover plate is arranged above the driving assembly, a limiting block is movably installed on the cover plate, the limiting block and the ejector rod are coaxial, and the limiting block is used for limiting the initial position of the ejector rod. The valve element assembly has the beneficial effects that the valve element assembly is only composed of three parts, so that the assembly accumulative error is effectively reduced, and the percent of pass is increased; the coil and the iron core drive the ejector rod to push the valve element assembly to move downwards, the moving stroke of the valve element assembly can be adjusted, and the device has the advantages of being low in machining and assembling difficulty, high in production efficiency and the like.

Description

Technical Field

[0001] This application relates to the field of solenoid valve technology, and in particular to a stainless steel two-position three-way direct-acting explosion-proof solenoid valve. Background Technology

[0002] A solenoid valve is a control element that controls fluids through electromagnetic fields. Currently, solenoid valves are widely used in light industry. However, with the development of technology, the application fields of solenoid valves are constantly expanding. In some more dangerous places such as coal mines, military industry, and railways, higher requirements are placed on the explosion-proof performance of solenoid valves to avoid serious accidents caused by damage to the solenoid valves.

[0003] Currently, two-position three-way direct-acting solenoid valves mainly use coils and iron cores to attract the valve core and thus control the solenoid valve to perform actions. This places high demands on the stroke of the iron core to attract the valve core, and even slight deviations in the manufactured parts can cause the solenoid valve to malfunction. In addition, traditional valve cores are composed of multiple parts, and cumulative errors are inevitable during the assembly process, which makes the product assembly complex and results in a low pass rate. Utility Model Content

[0004] One objective of this application is to provide a stainless steel two-position three-way direct-acting explosion-proof solenoid valve that can solve at least one of the defects in the above-mentioned background art.

[0005] To achieve at least one of the above objectives, the technical solution adopted in this application is as follows: a stainless steel two-position three-way direct-acting explosion-proof solenoid valve, comprising a valve body, wherein a chamber is provided inside the valve body, and a valve core assembly for sealing the chamber is slidably installed in the chamber. A drive assembly and a push rod are installed above the valve body, the push rod being located above the valve core assembly, and the drive assembly is used to drive the push rod to push the valve core assembly downward. A cover plate is provided above the drive assembly, and a limit block is movably installed on the cover plate. The limit block is coaxial with the push rod and is used to limit the initial position of the push rod. With the above configuration, when the drive assembly is working, the valve core assembly can be pushed downward by the push rod, thereby changing the sealing state of the chamber; when there is an error in the product processing, adjusting the position of the limit block can limit the movement stroke of the valve core assembly by the push rod.

[0006] Preferably, the chamber includes an inlet chamber, an outlet chamber, and a working chamber. Both the inlet chamber and the outlet chamber are connected to the working chamber. The valve core assembly includes a first piston, a second piston, and a connecting block. The first piston is installed in the inlet chamber, the second piston is installed in the outlet chamber, and the connecting block is installed in the working chamber. This configuration allows the working chamber to be alternately blocked by the first and second pistons, and the gas flow direction can be controlled based on the connection status between the working chamber and the inlet and outlet chambers.

[0007] Preferably, the valve body is provided with an air inlet, an air outlet, and a working hole; the air inlet is connected to the air inlet chamber, the working hole is connected to the working chamber, and the air outlet is connected to the air outlet chamber. With this configuration, when the air inlet chamber and the working chamber are connected, gas can enter the working hole through the air inlet for operation; when the air outlet chamber and the working chamber are connected, gas in the working chamber can be discharged through the air outlet chamber.

[0008] Preferably, the dimensions of both the air inlet chamber and the air outlet chamber are larger than the dimension of the working chamber; the dimensions of both the first piston and the second piston are larger than the dimension of the working chamber. This configuration allows for a more comprehensive sealing of the working chamber using either the first or second piston, preventing the piston from entering the working chamber.

[0009] Preferably, the first piston is provided with a connecting rod, and the second piston is provided with a mounting hole that cooperates with the connecting rod for limiting. The connecting block is inserted into the connecting rod to limit the relative position between the first piston and the second piston. This configuration reduces the number of components in the valve core assembly to three, effectively decreasing cumulative installation errors and further simplifying the installation steps between valve core assemblies. It also allows for quick disassembly and repair when the valve core assembly is damaged.

[0010] Preferably, a first sealing ring is installed between the first piston and the connecting block, and a second sealing ring is installed between the second piston and the connecting block. This arrangement can further improve the sealing effect of the first and second pistons on the working chamber.

[0011] Preferably, a bottom cover is installed on the valve body near the end of the first piston. The bottom cover has a first mounting groove, and the first piston is partially and sealed within the first mounting groove. An elastic element is installed between the first mounting groove and the first piston. This configuration allows the elastic element to define the initial positions of the first and second pistons. When the drive assembly is stopped, the elastic element uses its own elastic force to push the first piston upwards and seal the working chamber.

[0012] Preferably, an explosion-proof housing is installed on the valve body, and the drive assembly is installed inside the explosion-proof housing; the drive assembly includes a coil and an iron core, and the push rod is movably inserted into the iron core. This configuration provides a higher level of safety for the solenoid valve through the explosion-proof housing. When the coil is energized, a magnetic field is applied to the iron core, and the push rod, under the action of the magnetic field, pushes the second piston downwards, overcoming the elastic force of the elastic element.

[0013] Preferably, the explosion-proof housing has a protrusion that is sealed and inserted into the valve body; the protrusion has a second mounting groove, and the second piston is partially and sealed within the second mounting groove. This configuration allows the explosion-proof housing to be mounted to the valve body via the protrusion, and the sealed installation of the second mounting groove and the second piston effectively prevents gas from the outlet chamber from entering the explosion-proof housing.

[0014] Preferably, the outer wall of the protrusion is provided with an annular groove along the circumferential direction, and a limiting baffle is installed in the annular groove. The size of the limiting baffle is larger than the opening size of the valve body. This configuration improves the connection stability between the valve body and the explosion-proof housing through the limiting baffle, preventing the explosion-proof housing from detaching from the valve body under external pressure.

[0015] Compared with the prior art, the beneficial effects of this application are as follows:

[0016] This invention uses a coil and an iron core to control the push rod to move the valve core assembly downwards, changing the traditional upward-pulling piston of the iron core to a downward-pulling piston, effectively reducing the stroke error of the valve core assembly. In addition, users can change the position of the limit block according to the actual situation, thereby adjusting the movement stroke of the valve core assembly, effectively improving the product qualification rate.

[0017] This invention improves the traditional single-chamber design by converting it into a three-chamber design. It utilizes the alternating blocking of the working chamber by the first and second pistons to change the gas flow direction. The relative positions of the first and second pistons are further defined by the connecting block, preventing changes in the movement stroke of the valve core assembly during long-term use. In addition, the valve core assembly in this device consists of only three parts, effectively reducing the cumulative error of the valve core assembly. It has the advantages of simple assembly and high product qualification rate. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the stainless steel two-position three-way direct-acting explosion-proof solenoid valve in this application.

[0019] Figure 2 for Figure 1 A magnified structural diagram of part A in the middle.

[0020] Figure 3 for Figure 1 A magnified structural diagram of local area B in the middle.

[0021] Figure 4 for Figure 1 A magnified structural diagram of point C in the middle section.

[0022] Figure 5 This is an exploded structural diagram of the stainless steel two-position three-way direct-acting explosion-proof solenoid valve in this application.

[0023] In the diagram: 1. Valve body; 11. Inlet chamber; 12. Working chamber; 13. Outlet chamber; 100. Top rod; 110. Inlet hole; 120. Working hole; 130. Outlet hole; 2. Valve core assembly; 21. First piston; 22. Second piston; 23. Connecting block; 200. Cover plate; 201. Limiting block; 210. Connecting rod; 220. Mounting hole; 3. Drive assembly; 31. Coil; 32. Iron core; 301. First sealing ring; 302. Second sealing ring; 4. Explosion-proof housing; 41. Protrusion; 400. Elastic element; 410. Second mounting groove; 411. Annular groove; 5. Bottom cover; 51. First mounting groove; 500. Limiting baffle. Detailed Implementation

[0024] The present application will be further described below with reference to specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0025] In the description of this application, it should be noted that the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., which indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, 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, and should not be construed as limiting the specific protection scope of this application.

[0026] It should be noted that the terms "first," "second," etc., in the specification and claims of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0027] The terms “comprising” and “having”, and any variations thereof, in the specification and claims of this application are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0028] One aspect of this application provides a stainless steel two-position three-way direct-acting explosion-proof solenoid valve, such as Figure 1 and Figure 2As shown, one preferred embodiment includes a valve body 1, with an internal chamber for ventilation. A valve core assembly 2 for sealing the chamber is installed inside the chamber. As the valve core assembly 2 moves within the chamber, it can achieve different degrees of sealing depending on its location. A drive assembly 3 and a push rod 100 are mounted above the valve body 1. The push rod 100 is inserted into the valve body 1 and close to the valve core assembly 2. The drive assembly 3 drives the push rod 100 downwards, thereby pressing down on the valve core assembly 2 and forcing it to move downwards synchronously, thus sealing the chamber.

[0029] It should be understood that traditional solenoid valves control the valve core assembly 2 by energizing the coil 31 and applying a magnetic field to the iron core 32. However, when the adsorption stroke of the iron core 32 and the stroke height of the valve core assembly 2 are inconsistent, the valve core assembly 2 may easily detach from the control of the iron core 32. In this application, the valve core assembly 2 is moved by pressing down the push rod 100. Using the push rod 100 as a medium can further improve the stability of the movement of the valve core assembly 2.

[0030] In some embodiments of this application, further improvements have been made to address the above-mentioned situation, such as... Figure 2 As shown, a cover plate 200 is provided above the drive assembly 3, and a limiting block 201 for limiting the initial position of the push rod 100 is movably mounted on the cover plate 200. When the travel of the push rod 100 deviates, the travel of the push rod 100 can be further limited by adjusting the installation depth of the limiting block 201, so as to avoid the valve core assembly 2 not being able to be driven well due to insufficient travel of the push rod 100.

[0031] It should be noted that the adjustable limit block 201 can eliminate the influence of errors by adjusting the position of the limit block 201 when there are errors in the processing of the product, thereby adjusting unqualified products within a certain error range into qualified products and further increasing the product qualification rate.

[0032] In this embodiment, as Figure 1 As shown, the chamber includes an inlet chamber 11, an outlet chamber 13, and a working chamber 12, both of which are connected to the working chamber 12. The valve core assembly 2 includes a first piston 21, a second piston 22, and a connecting block 23; the first piston 21 is installed in the inlet chamber 11, the second piston 22 is installed in the outlet chamber 13, and the connecting block 23 is installed in the working chamber 12. This device changes the gas flow state by alternately blocking the working chamber 12 with the first piston 21 and the second piston 22. When the second piston 22 is in the blocking state, the first piston 21 is open, and the gas in the inlet chamber 11 enters the working chamber 12; when the first piston 21 is in the blocking state, the second piston 22 is open, and the gas in the working chamber 12 enters the outlet chamber 13.

[0033] Furthermore, such as Figure 1 As shown, the valve body 1 is provided with an air inlet 110, a working hole 120, and an air outlet 130; wherein, the air inlet 110 is connected to the air inlet chamber 11, the working hole 120 is connected to the working chamber 12, and the air outlet 130 is connected to the air outlet chamber 13. Gas enters the air inlet chamber 11 through the air inlet 110. When the first piston 21 is opened, the gas enters the working chamber 12 and is compressed, and then works through the working hole 120; when the second piston 22 is opened, the compressed gas in the working chamber 12 enters the air outlet chamber 13 under the push of air pressure, and then is discharged to the outside through the air outlet 130.

[0034] Specifically, such as Figure 3 and Figure 4 As shown, the dimensions of the air inlet chamber 11 and the air outlet chamber 13 are both larger than the dimensions of the working chamber 12, and the dimensions of the first piston 21 and the second piston 22 are both larger than the dimensions of the working chamber 12, so that the first piston 21 or the second piston 22 can more comprehensively seal the working chamber 12.

[0035] It should be noted that the valve core assembly 2 currently has a relatively large number of parts. The first piston 21 and the second piston 22 are generally installed at both ends of the connecting block 23 through multiple mounting components. When there are many mounting components, even with high machining accuracy, a large cumulative error will inevitably occur when multiple components are installed, thereby reducing the product qualification rate.

[0036] Therefore, in order to further reduce the cumulative error of the valve core assembly 2, in some embodiments of this application, such as Figure 1 , Figure 2 and Figure 3 As shown, a connecting rod 210 is provided on the end face of the first piston 21, and an mounting hole 220 is provided on the second piston 22 to limit its installation with the connecting rod 210, ensuring that the first piston 21 can be directly installed with the second piston 22. When installing the valve core assembly 2, the connecting block 23 is inserted into the connecting rod 210, and then the connecting rod 210 is limited to the mounting hole 220, with both ends of the connecting block 23 abutting against the first piston 21 and the second piston 22 respectively. The initial positions of the first piston 21 and the second piston 22 are defined by the connecting block 23. This application limits the number of components in the valve core assembly 2 to three, effectively reducing cumulative installation errors and further simplifying the installation steps between valve core assemblies 2. When the valve core assembly 2 is damaged, it can be quickly disassembled and repaired.

[0037] It should be noted that the installation methods of the connecting rod 210 and the mounting hole 220 include, but are not limited to, threaded installation.

[0038] Furthermore, such as Figure 3 and Figure 4 As shown, in order to further improve the sealing effect of the first piston 21 and the second piston 22 on the working chamber 12, a first sealing ring 301 is installed between the first piston 21 and the connecting block 23, and a second sealing ring 302 is installed between the second piston 22 and the connecting block 23.

[0039] In this embodiment, as Figure 4 and Figure 5 As shown, a bottom cover 5 is installed on the valve body 1 near the first piston 21. A first mounting groove 51 is provided on the bottom cover 5, and a portion of the first piston 21 is sealed and installed in the first mounting groove 51 to prevent gas in the intake chamber 11 from entering the first mounting groove 51. At the same time, in order to cooperate with the drive assembly 3 to return the push rod 100 to its initial position, an elastic element 400 is installed between the first mounting groove 51 and the first piston 21. When the drive assembly 3 controls the push rod 100 to move downward, it compresses the elastic element 400 and stores elastic force in the elastic element 400. When the drive assembly 3 stops working, the push rod 100 will move upward under the elastic force of the elastic element 400 until it abuts against the limit block 201. At this time, the push rod 100 returns to its initial position and waits for the next movement.

[0040] To improve the explosion-proof performance of the solenoid valve, in some embodiments of this application, such as... Figure 1 and Figure 2 As shown, the valve body 1 is equipped with an explosion-proof housing 4, and the drive assembly 3 is installed inside the explosion-proof housing 4. The drive assembly 3 includes a coil 31 and an iron core 32. The push rod 100 is movably inserted into the iron core 32. When the coil 31 is energized, a magnetic field is added to the iron core 32. At this time, the push rod 100 pushes the second piston 22 to move downward against the elastic force of the elastic element 400 under the action of the magnetic field force.

[0041] It should be noted that the explosion-proof housing 4 can be made of materials such as CF3M stainless steel, which have good corrosion resistance and heat resistance; the other metal parts can be made of 316 stainless steel.

[0042] Furthermore, such as Figure 1 and Figure 3 As shown, the lower part of the explosion-proof housing 4 is provided with a protrusion 41, which is sealed and inserted into the valve body 1 to prevent gas in the valve body 1 from entering the explosion-proof housing 4 through the joint between the valve body 1 and the protrusion 41; the protrusion 41 is provided with a second mounting groove 410, and the second piston 22 is partially sealed and installed in the second mounting groove 410 to prevent gas in the valve body 1 from entering the explosion-proof housing 4 through the joint between the second piston 22 and the protrusion 41.

[0043] It should be noted that the first mounting groove 51 and the second mounting groove 410 can respectively radially limit the first piston 21 and the second piston 22 to prevent the first piston 21 and the second piston 22 from shifting during movement.

[0044] In this embodiment, as Figure 1 and Figure 3 As shown, an annular groove 411 is provided on the outer wall of the protrusion 41 along the circumferential direction. A limiting baffle 500 is installed in the annular groove 411, and the size of the limiting baffle 500 is larger than the opening size of the valve body 1. When the protrusion 41 reaches the correct installation point in the valve body 1, the limiting baffle 500 is inserted into the annular groove 411 and reinforced by fasteners. This can improve the connection stability between the valve body 1 and the explosion-proof housing 4, and prevent the explosion-proof housing 4 from being detached from the valve body 1 due to external pressure.

[0045] The basic principles, main features, and advantages of this application have been described above. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this application. Various changes and modifications can be made to this application without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection claimed by this application is defined by the appended claims and their equivalents.

Claims

1. A stainless steel two-position three-way direct-acting explosion-proof solenoid valve comprising a valve body (1), characterized in that, The inside of the valve body (1) is provided with a chamber, a valve core assembly (2) for sealing the chamber is slidingly installed in the chamber; a driving assembly (3) and a top rod (100) are installed above the valve body (1), the top rod (100) is above the valve core assembly (2), the driving assembly (3) is used for driving the top rod (100) to push the valve core assembly (2) to move downward; a cover plate (200) is arranged above the driving assembly (3), a limiting block (201) is movably installed on the cover plate (200), the limiting block (201) is coaxial with the top rod (100), and the limiting block (201) is used for limiting the initial position of the top rod (100).

2. The stainless steel two-position three-way direct-acting explosion-proof solenoid valve according to claim 1, characterized by The chamber comprises an air inlet chamber (11), an air outlet chamber (13) and a working chamber (12), the air inlet chamber (11) and the air outlet chamber (13) are in communication with the working chamber (12), and the valve core assembly (2) comprises a first piston (21), a second piston (22) and a connecting block (23), the first piston (21) is installed in the air inlet chamber (11), the second piston (22) is installed in the air outlet chamber (13), and the connecting block (23) is installed in the working chamber (12).

3. The stainless steel two-position three-way direct-acting explosion-proof solenoid valve according to claim 2, characterized by The valve body (1) is provided with an air inlet hole (110), an air outlet hole (130) and a working hole (120); the air inlet hole (110) is in communication with the air inlet chamber (11), the working hole (120) is in communication with the working chamber (12), and the air outlet hole (130) is in communication with the air outlet chamber (13).

4. The stainless steel two-position three-way direct-acting explosion-proof solenoid valve according to claim 2, characterized by The sizes of the air inlet chamber (11) and the air outlet chamber (13) are greater than the size of the working chamber (12); the sizes of the first piston (21) and the second piston (22) are greater than the size of the working chamber (12).

5. The stainless steel two-position three-way direct-acting explosion-proof solenoid valve according to claim 2, characterized by The first piston (21) is provided with a connecting rod (210), the second piston (22) is provided with a mounting hole (220) in limiting cooperation with the connecting rod (210), and the connecting block (23) is inserted with the connecting rod (210) and used for limiting the relative position between the first piston (21) and the second piston (22).

6. The stainless steel two-position three-way direct-acting explosion-proof solenoid valve according to claim 5, characterized by The first sealing ring (301) is installed between the first piston (21) and the connecting block (23), and the second sealing ring (302) is installed between the second piston (22) and the connecting block (23).

7. The stainless steel two-position three-way direct-acting explosion-proof solenoid valve according to claim 6, characterized by A bottom cover (5) is installed on one end of the valve body (1) close to the first piston (21), the bottom cover (5) is provided with a first mounting groove (51), the first piston (21) is partially and sealingly installed in the first mounting groove (51), and an elastic element (400) is installed between the first mounting groove (51) and the first piston (21).

8. The stainless steel two-position three-way direct-acting explosion-proof solenoid valve according to claim 6, characterized by An explosion-proof shell (4) is installed on the valve body (1), and the driving assembly (3) is installed in the inside of the explosion-proof shell (4); the driving assembly (3) comprises a coil (31) and an iron core (32), and the top rod (100) is movably inserted into the iron core (32).

9. The stainless steel two-position three-way direct-acting explosion-proof solenoid valve according to claim 8, characterized by The anti-explosion shell (4) is provided with a convex part (41), the convex part (41) is sealed and inserted with the valve body (1), the convex part (41) is provided with a second installation groove (410), and the second piston (22) is partially and sealingly installed in the second installation groove (410).

10. The stainless steel two-position three-way direct-acting explosion-proof solenoid valve according to claim 9, characterized by The outer wall of the convex part (41) is provided with an annular groove (411) along the circumferential direction, a limiting baffle (500) is installed in the annular groove (411), and the size of the limiting baffle (500) is greater than the opening size of the valve body (1).

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