CN115978227A - Pilot-operated type two-position four-way electromagnetic valve - Google Patents
Pilot-operated type two-position four-way electromagnetic valve Download PDFInfo
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Abstract
The invention provides a pilot-operated two-position four-way electromagnetic valve which comprises a valve body, a valve core assembly and an electromagnetic control assembly, wherein a valve cavity, a piston cavity and an electromagnetic control cavity which are sequentially communicated are arranged in the valve body, and a port P, a port B, a port A and a port E which are communicated with the valve cavity; the port P is communicated with the electromagnetic control cavity through a first flow passage, and the port E is communicated with the electromagnetic control cavity through a second flow passage; the valve core assembly comprises a valve rod penetrating in the valve cavity and a piston piece which is connected with the valve rod and is slidably installed in the piston cavity, a piston left cavity and a piston right cavity are formed on two sides of the piston piece respectively, the piston left cavity is communicated with the P port all the time, and the piston right cavity is communicated with the electromagnetic control cavity; the electromagnetic control assembly is arranged in the electromagnetic control cavity and used for controlling one of the first flow passage and the second flow passage to be communicated with the piston right cavity, and the other flow passage to be disconnected with the piston right cavity. The pilot-operated two-position four-way electromagnetic valve provided by the invention can be used for commonly using gas and liquid media, is stable and reliable to control and has good sealing property.
Description
Technical Field
The invention relates to the field of electromagnetic valves, in particular to a pilot-operated two-position four-way electromagnetic valve.
Background
A solenoid valve is an actuator in an automatic control system for controlling the flow and changing the direction of a fluid, and the media are generally gas and liquid. Common solenoid valve types generally include a two-position two-way, a two-position three-way, and a two-position four-way, where the two-position four-way controls the direction of a more complex fluid.
At present, a two-position four-way solenoid valve is mainly divided into a direct-acting type and a pilot-operated type, and the direct-acting type two-position four-way solenoid valve is mainly suitable for liquid media and has the defects of large coil power, large volume, low use pressure, small flow path, high failure rate and the like. The pilot-operated two-position four-way electromagnetic valve is characterized by low coil power, small volume, large flow path, good reliability and relatively low maintenance cost; however, since the solenoid valve adopts an open pressure relief structure, and the pressure relief port is directly communicated with the outside, the solenoid valve can only be applied to gas media; in addition, the electromagnetic valve needs to control the pressure of a plurality of cavities to realize the on-off of the flow channel, the structure is complex, and the control is unstable and unreliable. Therefore, it is necessary to design a general solenoid valve that is applicable to both liquid and gas and has the advantages of pilot operation.
Disclosure of Invention
Technical problem to be solved
The invention aims to provide a pilot-operated two-position four-way electromagnetic valve which can be used for general gas and liquid media, is stable and reliable to control and has good sealing property.
(II) technical scheme
In order to solve the technical problem, the invention provides a pilot-operated two-position four-way electromagnetic valve which comprises a valve body.
The valve body is internally provided with a valve cavity, a piston cavity, an electromagnetic control cavity, a port P, a port B, a port A and a port E which are sequentially communicated, wherein the port P, the port B, the port A and the port E are all communicated with the valve cavity; the port P is communicated with the electromagnetic control cavity through a first flow passage, and the port E is communicated with the electromagnetic control cavity through a second flow passage.
The valve core assembly comprises a valve rod arranged in the valve cavity in a penetrating mode and a piston piece connected with the valve rod and slidably installed in the piston cavity, a piston left cavity and a piston right cavity are formed in two sides of the piston piece respectively, the piston left cavity is communicated with the port P all the time, and the piston right cavity is communicated with the electromagnetic control cavity.
And the electromagnetic control assembly is arranged in the electromagnetic control cavity and is used for controlling the communication of any one of the first flow channel and the second flow channel with the right piston cavity and the disconnection of the other one of the first flow channel and the second flow channel with the right piston cavity.
Furthermore, the electromagnetic control assembly comprises a static core and a slidable movable core which are arranged in the electromagnetic control cavity; the upper end of the static fixed core is provided with an upper valve port communicated with the second flow channel, and the lower end of the static fixed core is provided with a lower valve port communicated with the first flow channel; the movable iron core is provided with an upper plug body for opening and closing the upper valve port and a lower plug body for opening and closing the lower valve port, and the upper plug body is linked with the lower plug body to enable the two plug bodies to open one valve port and close the other valve port all the time.
Furthermore, a control upper cavity and a control lower cavity are respectively formed on the upper side and the lower side of the stationary core, the control upper cavity is communicated with the control lower cavity through a through runner, and the control lower cavity is communicated with the piston right cavity through a diversion hole; a first L-shaped flow passage and a second L-shaped flow passage are arranged on one side of the stationary core, the second flow passage, the first L-shaped flow passage, the upper valve port and the upper control cavity are sequentially communicated, and the first flow passage, the second L-shaped flow passage, the lower valve port and the lower control cavity are sequentially communicated.
Furthermore, the upper plug body is connected with the lower plug body through guide posts symmetrically arranged, the guide posts penetrate through the static fixed core, and guide holes matched with the guide posts are formed in the static fixed core.
Furthermore, the electromagnetic control assembly further comprises a magnetism isolating pipe and an electromagnetic coil arranged on the outer side of the magnetism isolating pipe, the movable iron core is slidably arranged in the magnetism isolating pipe, a first spring is arranged between the movable iron core and the magnetism isolating pipe, and a second spring is arranged between the lower plug body and the bottom wall of the electromagnetic control cavity; in a power-off state, under the action of the two springs, the upper valve port is blocked by the upper plug body, the lower valve port is opened by the lower plug body, the port P is communicated with the right piston cavity through the first flow channel, and the port E is disconnected with the right piston cavity.
Further, a piston middle cavity is formed on the outer side of the middle part of the piston piece, and the piston middle cavity is always communicated with the port E through a third flow passage. A piston seat is arranged between the valve cavity and the piston cavity, the left piston cavity is positioned in the piston seat, the middle piston cavity is positioned between the piston seat and the piston piece, and the right piston cavity is positioned in the piston cavity; the sectional area of the piston left cavity is smaller than that of the piston right cavity, and the piston piece moves towards the piston left cavity under the same pressure.
Further, the valve body comprises a valve body main body and a valve cover which are in sealing connection, the valve cover is perpendicular to the valve body main body, the valve cavity, the port P, the port B, the port A and the port E are all arranged on the valve body main body, the piston cavity and the electromagnetic control cavity are all arranged on the valve cover, the valve cavity and the piston cavity are located on the same central axis, and the electromagnetic control cavity is located on the upper side of the piston cavity; an end cover used for plugging the valve cavity is fixed on one side of the valve body main body.
Further, a first sealing element is arranged on the position of the valve rod corresponding to the port B, and a second sealing element is arranged on the position of the valve rod corresponding to the port A; the first sealing piece and the second sealing piece are identical in structure and are symmetrically arranged, the first sealing piece and the second sealing piece are sleeved with a copper main body on the valve rod and a rubber covering piece coated on the copper main body, the rubber covering piece is provided with a first sealing surface on one side, a second sealing surface on the other side and a sliding sealing surface with a V-shaped structure on the inner side.
Furthermore, the port P is a pressure port, the port B and the port A are outlets, the port E is a discharge port, and the port P is always communicated with the left piston cavity through a central hole in the valve rod; in a power-off state, the valve rod is in a left limiting state, the port P is communicated with the port A and the port B is communicated with the port E under the action of two sealing elements; under the power-on state, the valve rod is in the right limit position, the port P is communicated with the port B, and the port A is communicated with the port E.
(III) the beneficial effects.
According to the pilot-operated two-position four-way electromagnetic valve provided by the invention, the P port can be communicated with the right piston cavity through the first flow passage to pressurize the piston, the E port can be communicated with the right piston cavity through the second flow passage to relieve the pressure of the piston, and the electromagnetic control assembly controls the first flow passage or the second flow passage to be communicated with the right piston cavity, so that the left and right movement of the valve rod assembly is controlled, the switching of the flow passages can be realized only by controlling the pressure of the right piston cavity during control, the control process is simpler, and the control process is more stable and reliable; in addition, the piston middle cavity is always communicated with the port E through the third flow passage, so that the piston part is guaranteed not to bear extra pressure any more, and the piston part can move more stably and reliably; the second flow channel is a pressure relief flow channel, and the pressure relief flow channel is arranged in the valve body and is directly communicated with the E port for pressure relief, so that the valve body can be used for general use of gas and liquid media, and the universality is improved; and the sliding sealing surface of the sealing element tightly wraps the valve rod step, so that the sealing element is prevented from swinging, the sealing element can be perfectly sealed with the valve rod, the sealing surfaces on two sides can be flat, the overall strength can be increased, and the use is stable and reliable.
Drawings
FIG. 1 is a schematic structural diagram of a pilot-operated two-position four-way solenoid valve according to the present invention.
Fig. 2 is a schematic structural diagram of an electromagnetic control assembly of a pilot-operated two-position four-way solenoid valve according to the present invention.
FIG. 3 is a schematic structural diagram of a stationary core of a pilot-operated two-position four-way solenoid valve according to the present invention.
Fig. 4 is a schematic structural diagram of a lower plug body of a pilot-operated two-position four-way solenoid valve according to the present invention.
FIG. 5 is a schematic structural diagram of a valve body and a valve core assembly of a pilot-operated two-position four-way solenoid valve according to the present invention.
Fig. 6 is a schematic structural diagram of a piston member of a pilot-operated two-position four-way solenoid valve according to the present invention.
FIG. 7 is a schematic structural diagram of a first sealing member of a pilot-operated two-position four-way solenoid valve according to the present invention.
FIG. 8 is a schematic structural diagram of the connection between the first sealing element and the valve stem of the pilot-operated two-position four-way solenoid valve of the present invention.
FIG. 9 is a schematic structural diagram of a pilot-operated two-position four-way solenoid valve of the present invention in a power-off state.
FIG. 10 is a schematic structural diagram of a pilot-operated two-position four-way solenoid valve according to the present invention in the energized state.
The corresponding part names for the various reference numbers in the figures are: 1. a valve body; 11. a valve body main body; 12. a valve cover; 13. an end cap; 101. a valve cavity; 102. a piston cavity; 103. an electromagnetic control cavity; 104. a first flow passage; 105. a second flow passage; 106. a flow guide hole; 107. a third flow path; 2. a valve core assembly; 21. a valve stem; 22. a piston member; 23. a piston seat; 24. a first seal member; 25. a second seal member; 211. a central bore; 221. a piston left chamber; 222. a piston right cavity; 223. a piston middle cavity; 241. a copper body; 242. a rubber covering; 243. a first sealing surface; 244. a second sealing surface; 245. a sliding seal face; 3. an electromagnetic control assembly; 31. a stationary core; 32. a movable iron core; 33. a magnetism isolating pipe; 34. an electromagnetic coil; 35. a first spring; 36. a second spring; 311. an upper valve port; 312. a lower valve port; 313. controlling the upper cavity; 314. controlling the lower cavity; 315. a through flow channel; 316. a first L-shaped flow channel; 317. a second L-shaped flow channel; 318. a guide hole; 321. an upper plug body; 322. a lower plug body; 323. and a guide post.
Detailed description of the preferred embodiments
The following detailed description of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Referring to fig. 1 to 10, the present invention provides a pilot-operated two-position four-way solenoid valve, which includes a valve body 1, a valve core assembly 2 and an electromagnetic control assembly 3.
Referring to fig. 1, a valve cavity 101, a piston cavity 102 and an electromagnetic control cavity 103 which are sequentially communicated are arranged in a valve body 1, and a port P, a port B, a port a and a port E which are all communicated with the valve cavity 101, wherein the port P is a pressure port, the port B and the port a are outlets, and the port E is a discharge port. The port P communicates with the electromagnetic control chamber 103 through a first flow passage 104 which is obliquely arranged, and the port E communicates with the electromagnetic control chamber 103 through a second flow passage 105 which is obliquely arranged. The first flow channel 104 is used for pressurization, the second flow channel 105 is used for pressure relief, and both the first flow channel 104 and the second flow channel 105 are arranged in the valve body 1, so that the valve body can be suitable for gas and liquid media.
Referring to fig. 1 and 5, the valve body 1 includes a valve body main body 11 and a valve cover 12 which are hermetically connected, and the valve cover 12 is perpendicular to the valve body main body 11, which is beneficial to reducing the overall volume and facilitating installation. The valve cavity 101, the port P, the port B, the port A and the port E are all arranged on the valve body main body 11, the port P and the port E are positioned on one side of the valve cavity 101, and the port B and the port A are positioned on the other side of the valve cavity 101. The piston cavity 102 and the electromagnetic control cavity 103 are both arranged on the valve cover 12, the valve cavity 101 and the piston cavity 102 are positioned on the same central axis, and the electromagnetic control cavity 103 is positioned on the upper side of the piston cavity 102; an end cover 13 for plugging the valve cavity 101 is fixed on one side of the valve body main body 11.
Referring to fig. 1 and 5, the valve core assembly 2 includes a valve rod 21 penetrating through the valve cavity 101 and a piston member 22 connected to the valve rod 21 and slidably installed in the piston cavity 102, and the valve rod 21 can move left and right under the driving of the piston member 22 to control the connection and disconnection of the four connection ports. The piston member 22 is formed with a piston left chamber 221 and a piston right chamber 222 at both sides, respectively, and the piston member 22 is controlled to slide by the difference in the force received by the piston left chamber 221 and the piston right chamber 222. The piston left cavity 221 is always communicated with the port P through the valve rod 21, namely, the port P is always communicated with the piston left cavity 221 through the central hole 211 in the valve rod 21, and the piston right cavity 222 is communicated with the electromagnetic control cavity 103.
Referring to fig. 5 and 6, the piston member 22 is formed with a piston middle chamber 223 at an outer side of the middle portion, and the piston middle chamber 223 is always communicated with the E port through the third flow passage 107 in the valve body 1. In this way, the piston middle cavity 223 is always communicated with the discharge port E through the third flow passage 107, so that the piston member can be guaranteed not to bear the influence of extra pressure any more, and can move more reliably and be used more stably and reliably.
Referring to fig. 5 and 6, a piston seat 23 is installed between the valve cavity 101 and the piston cavity 102, the valve rod 21 passes through the piston seat 23, wherein the piston left cavity 221 is located in the piston seat 23, the piston middle cavity 223 is located between the piston seat 23 and the piston member 22, and the piston right cavity 222 is located in the piston cavity 102; the cross-sectional area of the left piston chamber 221 is smaller than that of the right piston chamber 222, i.e. under the same pressure, the right side of the piston member 22 is stressed more than the left side thereof, and the piston member 22 moves towards the left piston chamber 221.
Referring to fig. 5 and 7, the valve rod 21 is provided with a first sealing element 24 at a position corresponding to the port B, and a second sealing element 25 at a position corresponding to the port a, and the valve rod drives the two sealing elements to change the on-off of the four connecting ports. In order to simplify the structure, the first sealing element 24 and the second sealing element 25 are identical in structure and symmetrically arranged, and both include a copper main body 241 sleeved on the valve rod 21 and a rubber covering element 242 covering the copper main body 241, and the copper main body 241 and the rubber covering element 242 can be fixedly connected through a plastic mold and an adhesive. The rubber covering part 242 has a first sealing surface 243 on one side, a second sealing surface 244 on the other side, and a sliding sealing surface 245 with a V-shaped structure on the inner side, wherein the sliding sealing surface is in sliding sealing connection with the valve rod through the V-shaped structure, the used pressure is the largest, and the sliding sealing effect is better when the V-shaped expansion is larger.
The existing pneumatic type two-position four-way electromagnetic valve has a simple sealing structure, plays a role in sealing and moving completely by an O-shaped ring or a V-shaped ring sleeved on a valve rod, and can add a lubricating function to the surface due to the characteristics of air so as to ensure that the valve rod moves smoothly. Referring to fig. 7 and 8, the solenoid valve of the present invention needs to adapt to gas and liquid, and needs to improve the sealing structure, and the sealing element integrally wrapped is installed to move inwards along the valve rod, and the sliding sealing surface 245 in the sealing element just wraps the step of the valve rod tightly, so as to ensure that the sealing element does not swing and can be sealed with the valve rod well; because the valve rod and the sealing element are assembled, the stability is good, the sealing surfaces on two sides can be ensured to be flat and smooth, the valve rod is not influenced by external force, and the valve rod and a valve port have good sealing effect after being moved; after the sealing element moves or is influenced by medium pressure, the overall strength can be increased by the integrally wrapped design, the structure is not thin, and the use is stable and reliable.
Referring to fig. 1 and 2, the solenoid control assembly 3 is installed in the solenoid control chamber 103, and is configured to control one of the first flow passage 104 and the second flow passage 105 to be communicated with the piston right chamber 222, and the other to be disconnected from the piston right chamber 222.
Referring to fig. 2 and 3, the electromagnetic control assembly 3 includes a stationary core 31 and a slidable movable core 32 installed in an electromagnetic control chamber 103; the stationary core 31 is provided with an upper port 311 communicating with the second flow passage 105 at the upper end and a lower port 312 communicating with the first flow passage 104 at the lower end; the plunger 32 is provided with an upper plug 321 for opening and closing the upper valve port 311 and a lower plug 322 for opening and closing the lower valve port 312, and the upper plug 321 is linked with the lower plug 322 to make the two plugs always open one of the two valve ports and close the other valve port. This structure adopts quiet stationary core 31 and moves iron core 32 cooperation to realize that two valve ports open one and close the state, and design benefit guarantees the feasibility of structure.
Referring to fig. 2 and 3, the upper and lower sides of the stationary core 31 are respectively formed with a control upper chamber 313 and a control lower chamber 314, the control upper chamber 313 is communicated with the control lower chamber 314 through a through flow passage 315, and the control lower chamber 314 is communicated with the piston right chamber 222 through a diversion hole 106; a first L-shaped flow passage 316 and a second L-shaped flow passage 317 are disposed at one side of the stationary core 31, the second flow passage 105, the first L-shaped flow passage 316, the upper valve port 311 and the upper control chamber 313 are sequentially communicated, and the first flow passage 104, the second L-shaped flow passage 317, the lower valve port 312 and the lower control chamber 314 are sequentially communicated.
Referring to fig. 2 to 4, the upper plug body 321 is connected to the lower plug body 322 through symmetrically disposed guide posts 323, the guide posts 323 pass through the stationary core 31, and the stationary core 31 is provided with guide holes 318 adapted to the guide posts 323. The structure ensures that the upper plug body 321 is linked with the lower plug body 322, so that one valve port is always opened by the two plug bodies, and the other valve port is closed by the two plug bodies.
Referring to fig. 1 and 2, the electromagnetic control assembly 3 further includes a magnetism isolating tube 33 and an electromagnetic coil 34 installed outside the magnetism isolating tube 33, the plunger 32 is slidably installed in the magnetism isolating tube 33, a first spring 35 is installed between the plunger 32 and the magnetism isolating tube 33, and a second spring 36 is installed between the lower plug 322 and the bottom wall of the electromagnetic control cavity 103; in a power-off state, under the action force of the two springs, the upper plug body 321 blocks the upper valve port 311, the lower plug body 322 opens the lower valve port 312, the port P is communicated with the piston right cavity 222 through the first flow passage 104, and the port E is disconnected with the piston right cavity 222; the valve rod 21 is positioned at a left limit position, the port P is communicated with the port A, and the port B is communicated with the port E under the action of the two sealing elements; under the power-on state, the valve rod 21 is positioned at the right limit, the port P is communicated with the port B, and the port A is communicated with the port E.
The pilot-operated two-position four-way electromagnetic valve has the following use process.
Referring to fig. 9, in the coil power-off state, under the action of the two springs, the movable iron core 32 is located at the lower side, the upper plug body 321 blocks the upper valve port 311, the lower plug body 322 opens the lower valve port 312, at this time, the port P is communicated with the piston right cavity 222 through the first flow channel 104, the port P is communicated with the piston left cavity 221 through the central hole 211, because the sectional area of the piston left cavity 221 is smaller than that of the piston right cavity 222, that is, under the same pressure, the right side stress of the piston 22 is greater than the left side stress thereof, the piston 22 moves towards the piston left cavity 221, so that the valve rod 21 drives the two sealing members to abut against the left side wall surface, at this time, the fluid at the port P flows to the port a, and the port B and the port E are in a conducting state.
Referring to fig. 10, in the coil powered state, under the action of electromagnetic force, the plunger 32 slides upward and is located on the upper side, the upper plug 321 opens the upper valve port 311, the lower plug 322 blocks the lower valve port 312, and at this time, the piston right cavity 222 is communicated with the port E for pressure relief.
According to the pilot-operated two-position four-way electromagnetic valve provided by the embodiment, the port P can be communicated with the right piston cavity through the first flow passage to pressurize the port P, the port E can be communicated with the right piston cavity through the second flow passage to relieve the pressure of the port E, the electromagnetic control mechanism controls the first flow passage or the second flow passage to be communicated with the right piston cavity, so that the left and right movement of the valve rod assembly is controlled, the flow passage switching can be realized only by controlling the pressure of the right piston cavity during control, the control process is simpler, and the control process is more stable and reliable; in addition, the piston middle cavity is always communicated with the port E through the third flow passage, so that the piston part is guaranteed not to bear extra pressure any more, and the piston part can move more stably and reliably; the second flow passage is a pressure relief flow passage which is arranged in the valve body and is directly communicated with the E port for pressure relief, so that the valve body can be used for general use of gas and liquid media, and the universality is improved; and the sliding sealing surface of the sealing element tightly wraps the valve rod step, so that the sealing element is prevented from swinging, the sealing element can be perfectly sealed with the valve rod, the sealing surfaces on two sides can be flat, the overall strength can be increased, and the use is stable and reliable.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, it is possible to make various improvements and modifications without departing from the technical principle of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention.
Claims (10)
1. A pilot-operated two-position four-way solenoid valve, comprising:
the valve comprises a valve body (1), a valve cavity (101), a piston cavity (102) and an electromagnetic control cavity (103) which are sequentially communicated are arranged in the valve body (1), and a port P, a port B, a port A and a port E which are communicated with the valve cavity (101); the port P is communicated with the electromagnetic control cavity (103) through a first flow passage (104), and the port E is communicated with the electromagnetic control cavity (103) through a second flow passage (105);
the valve core assembly (2) comprises a valve rod (21) penetrating through the valve cavity (101) and a piston piece (22) connected with the valve rod (21) and slidably mounted in the piston cavity (102), a piston left cavity (221) and a piston right cavity (222) are formed in two sides of the piston piece (22) respectively, the piston left cavity (221) is communicated with the port P all the time, and the piston right cavity (222) is communicated with the electromagnetic control cavity (103);
and the electromagnetic control assembly (3) is arranged in the electromagnetic control cavity (103) and is used for controlling one of the first flow passage (104) and the second flow passage (105) to be communicated with the piston right cavity (222), and the other one of the first flow passage and the second flow passage to be disconnected with the piston right cavity (222).
2. The piloted two-position, four-way solenoid valve as in claim 1 wherein: the electromagnetic control assembly (3) comprises a static core (31) and a slidable movable iron core (32) which are arranged in the electromagnetic control cavity (103); the upper end of the static core (31) is provided with an upper valve port (311) communicated with the second flow channel (105), and the lower end of the static core is provided with a lower valve port (312) communicated with the first flow channel (104); the movable iron core (32) is provided with an upper plug body (321) for opening and closing the upper valve port (311) and a lower plug body (322) for opening and closing the lower valve port (312), and the upper plug body (321) is linked with the lower plug body (322) to enable the two plug bodies to open one valve port and close the other valve port all the time.
3. The piloted two-position, four-way solenoid valve as in claim 2 wherein: the upper side and the lower side of the stationary core (31) are respectively provided with a control upper cavity (313) and a control lower cavity (314), the control upper cavity (313) is communicated with the control lower cavity (314) through a through flow passage (315), and the control lower cavity (314) is communicated with the piston right cavity (222) through a diversion hole (106);
a first L-shaped flow channel (316) and a second L-shaped flow channel (317) are arranged on one side of the stationary core (31), the second flow channel (105), the first L-shaped flow channel (316), the upper valve port (311) and the control upper cavity (313) are sequentially communicated, and the first flow channel (104), the second L-shaped flow channel (317), the lower valve port (312) and the control lower cavity (314) are sequentially communicated.
4. The piloted two-position, four-way solenoid valve as in claim 2 wherein: the upper plug body (321) is connected with the lower plug body (322) through symmetrically arranged guide columns (323), the guide columns (323) penetrate through the static core (31), and guide holes (318) matched with the guide columns (323) are formed in the static core (31).
5. The piloted two-position, four-way solenoid valve as in claim 2 wherein: the electromagnetic control assembly (3) further comprises a magnetism isolating pipe (33) and an electromagnetic coil (34) arranged on the outer side of the magnetism isolating pipe (33), the movable iron core (32) is slidably arranged in the magnetism isolating pipe (33), a first spring (35) is arranged between the movable iron core (32) and the magnetism isolating pipe (33), and a second spring (36) is arranged between the lower plug body (322) and the bottom wall of the electromagnetic control cavity (103);
in a power-off state, under the action of two springs, the upper plug body (321) blocks the upper valve port (311), the lower plug body (322) opens the lower valve port (312), the port P is communicated with the piston right cavity (222) through the first flow passage (104), and the port E is disconnected with the piston right cavity (222).
6. The pilot-operated two-position four-way solenoid valve as claimed in claim 1, wherein: and a piston middle cavity (223) is formed on the outer side of the middle part of the piston piece (22), and the piston middle cavity (223) is always communicated with the port E through a third flow passage (107).
7. The piloted two-position, four-way solenoid valve as in claim 6 wherein: a piston seat (23) is arranged between the valve cavity (101) and the piston cavity (102), the piston left cavity (221) is positioned in the piston seat (23), the piston middle cavity (223) is positioned between the piston seat (23) and the piston piece (22), and the piston right cavity (222) is positioned in the piston cavity (102); the cross-sectional area of the piston left cavity (221) is smaller than that of the piston right cavity (222), and the piston piece (22) moves towards the piston left cavity (221) under the same pressure.
8. The piloted two-position, four-way solenoid valve as in claim 1 wherein: the valve body (1) comprises a valve body main body (11) and a valve cover (12) which are connected in a sealing mode, the valve cover (12) and the valve body main body (11) are arranged perpendicularly, the valve cavity (101), the port P, the port B, the port A and the port E are arranged on the valve body main body (11), the piston cavity (102) and the electromagnetic control cavity (103) are arranged on the valve cover (12), the valve cavity (101) and the piston cavity (102) are located on the same central axis, and the electromagnetic control cavity (103) is located on the upper side of the piston cavity (102); an end cover (13) used for plugging the valve cavity (101) is fixed on one side of the valve body main body (11).
9. The piloted two-position, four-way solenoid valve as in claim 1 wherein: the valve rod (21) is provided with a first sealing element (24) at the position corresponding to the port B, and a second sealing element (25) at the position corresponding to the port A; the first sealing piece (24) and the second sealing piece (25) are identical in structure and symmetrically arranged, each sealing piece comprises a copper main body (241) sleeved on the valve rod (21) and a rubber covering piece (242) covering the copper main body (241), the rubber covering piece (242) is provided with a first sealing surface (243) on one side, a second sealing surface (244) on the other side and a sliding sealing surface (245) of a V-shaped structure on the inner side.
10. The piloted two-position, four-way solenoid valve as in claim 9, wherein: the port P is a pressure port, the port B and the port A are outlets, the port E is a discharge port, and the port P is always communicated with the piston left cavity (221) through a central hole (211) in the valve rod (21); in a power-off state, the valve rod (21) is in a left limiting state, the port P is communicated with the port A under the action of two sealing elements, and the port B is communicated with the port E; under the power-on state, the valve rod (21) is positioned at the right limit position, the port P is communicated with the port B, and the port A is communicated with the port E.
Priority Applications (1)
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Also Published As
| Publication number | Publication date |
|---|---|
| CN115978227B (en) | 2023-05-26 |
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