An electromagnetic valve having inner and outer pilot valve seats

Abstract

The application relates to an electromagnetic valve with an inner and outer pilot valve seat, which comprises a main valve body assembly, a pilot valve and a coil assembly; wherein a valve body inner pilot gas path is arranged in the valve body, two ports of the valve body inner pilot gas path are respectively an air inlet and a valve body end face port; a sealing groove is arranged on one side of the valve seat facing the coil assembly, the bottom surface of the sealing groove comprises a sealing nozzle, a valve seat end face port and a valve seat blind hole are arranged on one side of the valve seat facing the main valve body assembly, a valve seat inner pilot gas path is arranged in the valve seat, two ports of the valve seat inner pilot gas path are respectively the valve seat end face port and the sealing nozzle; when the main valve body assembly and the pilot valve are connected at a first angle, the valve body end face port is connected with the valve seat end face port; when the main valve body assembly and the pilot valve are connected at a second angle, the valve body end face port is connected with the valve seat blind hole. The application can switch the inner pilot or outer pilot function by only changing the valve seat installation mode without adding parts or replacing the electromagnetic valve, and the working condition versatility is high.

Description

Technical Field

[0001] This invention relates to the field of pneumatic control, and more particularly to a solenoid valve with inner and outer pilot seats that uses compressed air as the working medium to transmit motion and power. Background Technology

[0002] With the introduction of modern mechanized production, pneumatic solenoid valves are a type of mechatronic product widely used in the control field. They can generally be assembled from two parts: the main valve body and the pilot valve. Currently, existing technologies for similar products have the following structural problems:

[0003] 1. The pilot design is limited and has poor versatility in various operating conditions;

[0004] 2. The switching of the product is unstable due to the influence of the operating pressure of the electromagnetic reversing valve.

[0005] Therefore, there is still room for improvement in existing solenoid valves with pilot valves. Summary of the Invention

[0006] To address the aforementioned deficiencies, the present invention aims to provide a solenoid valve with inner and outer pilot valve seats, by adding an inner pilot air path and an outer pilot air path to the valve seat of the pilot valve, thereby solving the technical problems of the prior art.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a solenoid valve with inner and outer pilot valve seats, the solenoid valve comprising a main valve body assembly, a pilot valve, and a coil assembly, wherein the main valve body assembly, the pilot valve, and the coil assembly are connected in sequence; wherein, the main valve body assembly includes a valve body, the valve body having an internal pilot air passage, the two ports of the internal pilot air passage being an air inlet and a valve body end face port, respectively; the pilot valve includes a valve seat, the side of the valve seat facing the coil assembly having a sealing groove, the bottom surface of the sealing groove including a sealing nozzle, the valve... A valve seat end face opening and a valve seat blind hole are provided on the side of the seat facing the main valve body assembly. The valve seat has an internal pilot air passage, and the two ends of the internal pilot air passage are the valve seat end face opening and the sealing nozzle, respectively. When the main valve body assembly and the pilot valve are connected at a first angle, the valve body end face opening is connected to the valve seat end face opening. When the main valve body assembly and the pilot valve are connected at a second angle, the valve body end face opening is connected to the valve seat blind hole. The first angle and the second angle differ by 180 degrees. The coil assembly is movably connected to the sealing nozzle for opening and closing the air passage.

[0008] According to a preferred embodiment of the present invention, the solenoid valve having inner and outer pilot valve seats further includes a valve seat inlet and an outer pilot air passage, the two ends of which are the valve seat inlet and the sealing nozzle, respectively.

[0009] According to a preferred embodiment of the present invention, the solenoid valve having inner and outer pilot valve seats further includes two sealing rings, which are respectively disposed on the valve seat end face and the valve seat blind hole.

[0010] According to a preferred embodiment of the present invention, the solenoid valve having inner and outer pilot valve seats further includes a valve seat piston. A piston groove is formed on the side of the valve seat facing the main valve body assembly. The valve seat piston is disposed in the piston groove. A drive air passage is formed in the piston groove to connect to the sealing groove.

[0011] According to a preferred embodiment of the present invention, the solenoid valve having inner and outer pilot valve seats includes a coil assembly comprising a socket coil and an iron core assembly, wherein the iron core assembly includes a plug movably connected to the sealing nozzle for opening and closing the air passage.

[0012] According to a preferred embodiment of the present invention, the solenoid valve having inner and outer pilot valve seats further includes a rear cover assembly, a valve stem assembly, and six O-rings. The valve stem assembly is disposed in the central through hole of the valve body. The rear cover assembly and the valve seat are respectively disposed at both ends of the central through hole of the valve body. The six O-rings are disposed on the valve stem assembly.

[0013] The design concept of this application is to design a solenoid valve with a pilot valve. Through the structural design of the valve seat of the pilot valve in the solenoid valve, the valve seat has the air passage required for internal and external piloting. By changing the different installation methods of the valve seat, the solenoid valve can switch between internal piloting and external piloting functions.

[0014] Due to the adoption of the above technical features, this invention has the following advantages and positive effects compared with the prior art:

[0015] First, this application requires no additional parts or replacement of the solenoid valve; it only requires changing the valve seat mounting method.

[0016] It can switch between internal pilot and external pilot functions, and has high versatility in operating conditions;

[0017] Secondly, the switching of the directional valve under external pilot conditions is not affected by the operating pressure of the directional valve. Therefore, the directional valve can work under low pressure or vacuum pressure conditions, making the product's switching operation more stable and reliable.

[0018] Of course, implementing any specific embodiment of the present invention does not necessarily have all of the above technical effects at the same time. Attached Figure Description

[0019] Figure 1 This is a cross-sectional schematic diagram of the solenoid valve of this application;

[0020] Figure 2 This is a schematic diagram showing the connection between the valve seat and the iron core assembly in this application;

[0021] Figure 3 This is a schematic diagram showing the connection between the sealing nozzle and the plug in this application;

[0022] Figure 4 This is a front view schematic diagram of the valve seat in this application;

[0023] Figure 5 for Figure 4 Schematic diagram of the AA section;

[0024] Figure 6 This is a cross-sectional schematic diagram of the valve seat in this application;

[0025] Figure 7 for Figure 6 Schematic diagram of the cross section of the middle DD;

[0026] Figure 8 This is a rear view of the valve seat in this application. Detailed Implementation

[0027] The following describes several preferred embodiments of the present invention in detail with reference to the accompanying drawings, but the present invention is not limited to these embodiments. The present invention encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of the present invention. To provide the public with a thorough understanding of the present invention, specific details are described in detail in the following preferred embodiments, but those skilled in the art will fully understand the present invention without these details. Furthermore, to avoid unnecessary misunderstanding of the essence of the present invention, well-known methods, processes, procedures, elements, etc., are not described in detail.

[0028] Please refer to Figure 1 and Figure 2 This application includes a cross-sectional schematic diagram of the solenoid valve and a connection diagram of the valve seat and iron core assembly. This application is a solenoid valve with internal and external pilot valve seats that uses compressed air as the working medium to transmit motion and power. Through the structural design of the pilot valve seat in the solenoid valve, the valve seat has the air path required for internal and external pilot operation, that is, the solenoid valve has an internal pilot air path and an external pilot air path. By changing the different installation methods of the valve seat, the solenoid valve can switch between the internal pilot and external pilot functions, and has high versatility in operating conditions. Figure 1 In the process, the solenoid valve includes a main valve body assembly 10, a pilot valve 20, and a coil assembly 30, which are connected in sequence.

[0029] like Figure 1As shown, the main valve body assembly 10 includes a valve body 11. The valve body 11 has a central through hole, an air inlet 1, a first working port 2, a second working port 4, a first air outlet 3, and a second air outlet 5. A pilot air passage (not shown) is provided on the valve body of the valve body 11. The two ends of the pilot air passage are the air inlet 1 and the valve body end face port 112, respectively. The valve body end face port 112 is located on the end face of the valve body 11 that connects to the pilot valve 20. During operation, the pilot air passage inside the valve body is always filled with compressed air transmitted from the air inlet 1.

[0030] Please also refer to Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 The pilot valve 20 includes a valve seat 21, on the side of the valve seat 21 facing the coil assembly 30, a sealing groove 211 is formed, and the bottom surface of the sealing groove 211 includes a sealing nozzle 212, such as... Figure 3 As shown, the sealing nozzle 212 protrudes from the bottom surface of the sealing groove 211, and the sealing nozzle 212 has an air inlet in the middle; furthermore, Figure 4 In the middle, the valve seat 21 has a valve seat end face opening 213 and a valve seat blind hole 214 on the side facing the main valve body assembly 10; Figure 5 In this embodiment, the valve seat 21 has an internal pilot air passage 215, the two ends of which are the valve seat end face opening 213 and the sealing nozzle 212, respectively. The internal pilot air passage within the valve body and the internal pilot air passage 215 constitute the internal pilot air passage. Figure 5 The pilot air passage 215 inside the valve seat mentioned above is only the first half of the entire pilot air passage 215 inside the valve seat; the second half is... Figure 5 It's not visible from the outside, but it's the air passage leading to the sealing nozzle 212.

[0031] The connection methods between the main valve body assembly 10 and the pilot valve 20 include: First connection method: such as... Figure 1As shown, the main valve body assembly 10 and the pilot valve 20 are connected at a first angle, and the valve body end face 112 is connected to the valve seat end face 213. During operation, compressed air in the pilot air path inside the valve body is transmitted from the valve body 11 to the valve seat 21 and then to the sealing nozzle 212; and a second connection method: the main valve body assembly 10 and the pilot valve 20 are connected at a second angle, and the valve body end face 112 is connected to the valve seat blind hole 214. During operation, compressed air in the pilot air path inside the valve body is transmitted from the valve body 11 to the valve seat blind hole 214. The valve seat blind hole 214 is a closed hole, and the compressed air stops advancing here; in this embodiment, the first angle and the second angle differ by 180 degrees, that is, when the internal pilot air path is not needed, it is only necessary to change the connection angle of the main valve body assembly 10 and the pilot valve 20 by 180 degrees. At this time, the compressed air in the pilot air path inside the valve body stops in the valve seat blind hole 214; as Figure 2 and Figure 3 As shown, the coil assembly 30 is movably connected to the sealing nozzle 212 for opening and closing the air passage, which is the air passage through the sealing nozzle 212.

[0032] Please refer to Figure 1 and Figure 6 The valve seat 21 also includes a valve seat air inlet 6 and an external pilot air passage 216. The two ends of the external pilot air passage 216 are the valve seat air inlet 6 and the sealing nozzle 212, respectively. The valve seat air inlet 6 is connected to an external air source. When the external pilot air passage is needed, the external air source is turned on, and the compressed air from the external air source enters from the valve seat air inlet 6 and finally reaches the sealing nozzle 212. During operation, if the external pilot air passage is needed, the main valve body assembly 10 and the pilot valve 20 are connected at a second angle. The valve body end face 112 is connected to the valve seat blind hole 214. The compressed air in the pilot air passage inside the valve body is transmitted from the valve body 11 to the valve seat blind hole 214 but cannot be transmitted to the sealing nozzle 212. At this time, the external air source is turned on, and the compressed air from the external air source enters from the valve seat air inlet 6 and reaches the sealing nozzle 212.

[0033] like Figure 2 As shown, the solenoid valve also includes two sealing rings 40, which are respectively disposed on the valve seat end face 213 and the valve seat blind hole 214. The function of the two sealing rings 40 is to seal and prevent compressed air in the pilot air passage of the valve body from leaking out from the connection surface between the main valve body assembly 10 and the pilot valve 20.

[0034] Please refer to Figure 1 , Figure 2 , Figure 4 and Figure 7The pilot valve 20 also includes a valve seat piston 22. The valve seat 21 has a piston groove 217 on the side facing the main valve body assembly 10. The valve seat piston 22 is disposed in the piston groove 217. The piston groove 217 has a drive air passage 218 connected to the sealing groove 211. During operation, compressed air enters the sealing groove 211 from the sealing nozzle 212 and then passes through the drive air passage 218 to the piston groove 217. The compressed air compresses the valve seat piston 22 to move.

[0035] like Figure 1 and Figure 3 As shown, the coil assembly 30 includes a socket coil 31 and an iron core assembly 32. The iron core assembly 32 includes a plug 321, which is movably connected to the sealing nozzle 212 for opening and closing the air passage. As mentioned above, the compressed air coming to the sealing nozzle 212 includes compressed air from the pilot air passage inside the valve body and compressed air from the pilot air passage 216 outside the valve seat. Therefore, the air passages opened and closed by the plug 321 include the inner pilot air passage and the outer pilot air passage. In this embodiment, the inner pilot air passage and the outer pilot air passage have already converged into one air passage before coming to the sealing nozzle 212. This design facilitates the opening of the air passage. Therefore, it is preferable that the opening surface of the valve seat air inlet 6 is adjacent to the opening surface of the valve seat end face 213.

[0036] like Figure 1 As shown, the main valve body assembly 10 also includes a rear cover assembly 12, a valve stem assembly 13, and six O-ring seals 14. The valve stem assembly 13 is disposed in the central through hole of the valve body 11, and one end of the valve stem assembly 13 is connected to the valve seat piston 22. After connection, the valve stem assembly 13 and the valve seat piston 22 move together. The rear cover assembly 12 and the valve seat 21 are respectively disposed at both ends of the central through hole of the valve body 11. The six O-ring seals 14 are disposed on the valve stem assembly 13 to form multiple cavities. During operation, compressed air enters the sealing groove 211 from the sealing nozzle 212 and then passes through the driving air passage 218 to the piston groove 217. The compressed air compresses the valve seat piston 22 to move, such as... Figure 1 In the middle, the valve stem assembly 13 is moved to the left, and the reversal is completed after it is in place.

[0037] To summarize, the air path of this application is as follows: The valve body 11 has five threaded ports, three on one side and two on the other. The middle threaded hole on the side with three ports is defined as inlet 1, the threaded hole near the rear cover assembly 12 on the side with two ports is defined as working port 2, and the other is defined as working port 4. Both working ports 2 and 4 are for operation. The remaining two threaded holes are defined as exhaust ports 3 and 5, respectively, both for exhaust. The one closest to the rear cover assembly 12 is exhaust port 3. Air enters through inlet 1 of the solenoid valve, and the intake is split into two paths: one path passes through the cavity separated by the O-ring seal 14 on the valve stem assembly 13 and exits through working port 2; the other path passes through the valve body. The air passage of the valve seat 21 leads to the sealing nozzle 212 of the valve seat 21 (this is the internal pilot state). When the rated voltage is applied to the socket coil 31 of the solenoid valve, the coil generates a magnetic field, which causes the moving iron core in the iron core assembly 32 to move and attract. The moving iron core drives the plug 321 away from the sealing nozzle 212. The air passage of the sealing nozzle 212 is connected to the valve seat piston 22, which causes the valve seat piston 22 to move towards the rear cover assembly 12 under air pressure. The displacement of the valve seat piston 22 causes the valve stem assembly 13 to move. The cavity separated by the O-ring seal 14 on the valve stem assembly 13 changes. The air inlet 1 is connected to the working port 4, and the air passage exits from the working port 4, completing one reversal action. When the coil is de-energized, the magnetic field disappears, and the moving iron core is reset by the spring force, which drives the plug 321 to seal the sealing nozzle 212. The air passage of the sealing nozzle 212 is blocked, and the air pressure on the valve seat piston 22 is reduced to zero. The valve stem assembly 13 is reset by the spring force of the rear cover assembly 12, and the air inlet 1 returns to its initial state and is connected to the working port 2, that is, the air passage is reset.

[0038] To change the aforementioned internal pilot state to an external pilot state, we rotate the valve seat 21 180 degrees. The corresponding hole in the original pilot air path of the valve body 11 is blocked by the sealing ring 40 on the valve seat 21 and the valve seat blind hole 214. Therefore, the air path used to drive the valve seat piston 22 needs to be input through the valve seat air inlet 6 of the valve seat 21. The air supplied by the valve seat air inlet 6 is the external pilot air source. The air path of the valve seat air inlet 6 is connected to the sealing nozzle 212. When the rated voltage is applied to the socket coil 31 of the solenoid valve... The coil generates a magnetic field, causing the moving iron core in the iron core assembly 32 to move and attract. The moving iron core drives the plug 321 away from the sealing nozzle 212, connecting the air passage of the sealing nozzle 212 to the valve seat piston 22. This causes the valve seat piston 22 to move towards the rear cover assembly 12 under air pressure. The displacement of the valve seat piston 22 causes the valve stem assembly 13 to move, changing the cavity separated by the O-ring seal 14 on the valve stem assembly 13. The air inlet 1 connects with the working port 4, and air exits from the working port 4, completing one reversal action. When the coil is de-energized, the magnetic field disappears, and the moving iron core resets due to spring force, causing the plug 321 to seal the sealing nozzle 212. The air passage of the sealing nozzle 212 is blocked, and the air pressure on the valve seat piston 22 decreases to zero. The valve stem assembly 13 resets again due to the spring force of the rear cover assembly 12, and the air inlet 1 returns to its initial state, connecting with the working port 2, i.e., the air passage is reset.

[0039] If, in the internal pilot state, the air pressure at the inlet of valve body 11 is less than the minimum operating pressure of the solenoid valve (the minimum operating pressure is usually between 1 bar and 3 bar, and may vary between different products), it is very likely that the valve stem assembly 13 will not be able to switch normally. Often, even if the air pressure at the inlet of valve body 11 is within the normal range of 6 bar, if the working port 2 or working port 4 of the solenoid valve is emptied, or if there is no load such as a cylinder or plug connected, the internal pressure of valve body 11 will also be lower than 3 bar, which may also cause the valve stem assembly 13 of valve body 11 to fail to switch correctly. If the solenoid valve needs to be suitable for low-pressure environments, where low pressure includes vacuum (-1 bar to +3 bar), then the external pilot state is used. In external pilot mode, the pilot pressure of the solenoid valve is provided by an independent air circuit, not by the inlet air pressure of valve body 11. The air pressure of the main air circuit controlled by valve body 11 is unrelated to the pilot pressure; as long as the pilot pressure is high enough, the valve stem assembly 13 can switch normally.

[0040] It should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this application.

[0041] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms 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 therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0042] At the same time, it should be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn according to actual scale.

[0043] In summary, due to the adoption of the above technical features, the present invention has the following advantages and positive effects compared with the prior art:

[0044] First, this application requires no additional parts or replacement of the solenoid valve; it only requires changing the valve seat mounting method.

[0045] It can switch between internal pilot and external pilot functions, and has high versatility in operating conditions;

[0046] Secondly, the switching of the directional valve under external pilot conditions is not affected by the operating pressure of the directional valve. Therefore, the directional valve can work under low pressure or vacuum pressure conditions, making the product's switching operation more stable and reliable.

[0047] The preferred embodiments of the invention are merely illustrative of the invention. They do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. These embodiments have been selected and specifically described in this specification to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to make good use of the invention. The invention is limited only by the claims and their full scope and equivalents. The above disclosures are merely preferred embodiments of the invention, but are not intended to limit it. Any equivalent changes and modifications made by those skilled in the art without departing from the spirit and essence of the invention should fall within the protection scope of the invention.

Claims

1. A solenoid valve having internal and external pilot seats, characterized in that, The solenoid valve includes a main valve body assembly, a pilot valve, and a coil assembly, which are connected sequentially. The main valve body assembly includes a valve body, and the valve body has an internal pilot air passage. The two ports of the internal pilot air passage are an air inlet and a valve body end face port, respectively. The pilot valve includes a valve seat, a sealing groove is formed on the side of the valve seat facing the coil assembly, the bottom surface of the sealing groove includes a sealing nozzle, a valve seat end face opening and a valve seat blind hole are formed on the side of the valve seat facing the main valve body assembly, and a pilot air passage is formed in the valve seat, the two ends of the pilot air passage in the valve seat are the valve seat end face opening and the sealing nozzle, respectively. When the main valve body assembly and the pilot valve are connected at a first angle, the valve body end face is connected to the valve seat end face. When the main valve body assembly and the pilot valve are connected at the second angle, the valve body end face is connected to the valve seat blind hole; the first angle and the second angle differ by 180 degrees. The coil assembly is movably connected to the sealing nozzle for opening and closing the air passage; The valve seat also includes a valve seat air inlet, and the valve seat also has an external pilot air passage, the two ends of which are the valve seat air inlet and the sealing nozzle, respectively. The pilot valve also includes a valve seat piston, and a piston groove is formed on the side of the valve seat facing the main valve body assembly. The valve seat piston is disposed in the piston groove, and a drive air passage is formed in the piston groove to connect to the sealing groove. The coil assembly includes a socket coil and an iron core assembly. The iron core assembly includes a plug that is movably connected to the sealing nozzle for opening and closing the air passage.

2. The solenoid valve with internal and external pilot seats as described in claim 1, characterized in that, The solenoid valve also includes two sealing rings, which are respectively disposed on the valve seat end face and the valve seat blind hole.

3. The solenoid valve with internal and external pilot seats as described in claim 2, characterized in that, The main valve body assembly also includes a rear cover assembly, a valve stem assembly, and six O-rings. The valve stem assembly is disposed in the central through hole of the valve body. The rear cover assembly and the valve seat are respectively disposed at both ends of the central through hole of the valve body. The six O-rings are disposed on the valve stem assembly.

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