Solenoid pilot operated four-way valve

Abstract

An electromagnetic pilot-operated four-way valve relates to the technical field of electromagnetic valves. The electromagnetic pilot-operated four-way valve comprises a shell, the shell comprises a first shell and a second shell, and the first shell and the second shell have an included angle of a set angle; a pilot mechanism is installed in the inner cavity of the first shell; a valve stem assembly is installed in the inner cavity of the second shell, the second shell has four flow channel holes, and the inner cavity of the second shell is divided into a plurality of chambers, and the pilot mechanism is used to drive the valve stem assembly to move in the second shell to change the on-off state between the chamber and the flow channel hole. Since there is an included angle between the first shell and the second shell, the electromagnetic pilot-operated four-way valve is bent as a whole and is relatively short in length.

Description

Technical Field

[0001] The invention relates to the field of solenoid valves, and in particular to an electromagnetic pilot-operated four-way valve. Background Art

[0002] At present, solenoid valves include direct-acting solenoid valves, solenoid pilot-operated four-way valves and distributed direct-acting solenoid valves. Solenoid pilot-operated four-way valves usually include a pilot valve and a valve body. The opening and closing of the pilot valve is controlled by a magnetic mechanism, thereby controlling the pressure of different chambers in the valve body, so that the valve core in the valve body moves, thereby changing the flow direction of the valve body through the valve.

[0003] However, due to the structural defects of the electromagnetic pilot-operated four-way valve in the prior art, the length of the electromagnetic valve is relatively long. Summary of the invention

[0004] The object of the present invention is to provide an electromagnetic pilot-operated four-way valve, which has a relatively short length.

[0005] The embodiment of the present invention is achieved as follows:

[0006] An electromagnetic pilot-operated four-way valve comprises: a housing, the housing comprising a first shell and a second shell, the first shell and the second shell having an included angle of a set angle;

[0007] A pilot mechanism is installed in the inner cavity of the first shell; a valve stem assembly is installed in the inner cavity of the second shell, the second shell has four flow holes, and the inner cavity of the second shell is divided into multiple chambers. The pilot mechanism is used to drive the valve stem assembly to move in the second shell to change the on-off state between the chamber and the flow hole.

[0008] In a preferred embodiment of the present invention, the first shell is provided with a pressure relief hole, and the pressure relief hole is communicated with the inner cavity of the first shell;

[0009] The second housing has two inner chambers, and the valve stem assembly includes two valve stems, which are installed in the two inner chambers of the second housing in a one-to-one correspondence. The valve stems divide the corresponding inner chambers into a plurality of chambers, and the two ends of the valve stem are respectively a first end and a second end.

[0010] The flow channel hole includes an air inlet hole, the air inlet holes are respectively connected to the chambers where the first ends of the two valve stems are located, and the air inlet holes are connected to the chamber of the first shell through a first passage; the inner cavity of the first shell is connected to the chamber where the second end of the valve stem is located through a second passage, and the cross-sectional area of ​​the chamber where the second end of the valve stem is located in a direction perpendicular to the movement of the valve stem is larger than the cross-sectional area of ​​the chamber where the first end of the valve stem is located in the direction perpendicular to the movement of the valve stem;

[0011] The pilot mechanism includes an electromagnetic coil and a moving iron core assembly. When the electromagnetic coil is energized, the moving iron core assembly is driven to move relative to the electromagnetic coil to block the first passage or the pressure relief hole.

[0012] In a preferred embodiment of the present invention, a guide cylinder is provided in the first housing, the moving iron core assembly comprises a moving iron core and a sliding member, the sliding member is slidably assembled with the guide cylinder, and a reset elastic member is connected between the sliding member and the moving iron core.

[0013] In a preferred embodiment of the present invention, a first seal is provided at one end of the sliding member facing the pressure relief hole, the moving iron core has a second seal, and the moving iron core assembly also includes a connecting rod, and elastic buffer members are provided between the connecting rod and the first seal and the second seal.

[0014] In a preferred embodiment of the present invention, a sealing gasket is provided on the end surface of the sealing portion, and a first sealing ring is sleeved on the sealing portion located at the second end of the valve stem.

[0015] In a preferred embodiment of the present invention, the end surface of the sealing portion is provided with a receiving groove, the sealing gasket is installed in the receiving groove, a partial area of ​​the sealing gasket extends out of the receiving groove, and the width of the receiving groove is smaller than the width of the sealing gasket.

[0016] In a preferred embodiment of the present invention, a manual mechanism is further included, which includes a rotating part, the axial direction of the rotating part is perpendicular to the moving direction of the moving iron core assembly, the side surface of the rotating part is in contact with the edge area of ​​the end surface of the moving iron core facing the second shell, and the rotation of the rotating part can push the moving iron core assembly to move in a direction away from the second shell.

[0017] In a preferred embodiment of the present invention, the first shell and the second shell are connected by an adapter, the two ends of the second shell are respectively connected with an end cover and a bottom cover, the end cover is connected to the adapter, and a second sealing ring is respectively provided between the second shell and the end cover, between the second shell and the bottom cover, between the bottom cover and the adapter, and between the adapter and the first shell.

[0018] In a preferred embodiment of the present invention, the end cover, the bottom cover and the adapter are all provided with sealing grooves, the second sealing ring is installed in the sealing groove, and a partial area of ​​the second sealing ring extends out of the sealing groove.

[0019] In a preferred embodiment of the present invention, the second shell and the end cover, as well as the second shell and the bottom cover are connected via a connecting piece, and the connecting piece includes a stud, a nut and a retaining structure, and the nut and the retaining structure are both sleeved on the stud.

[0020] The beneficial effects of the embodiments of the present invention are:

[0021] The pilot mechanism is installed in the first housing, the valve stem assembly is installed in the second housing, the flow channel hole is located on the second housing, and the pilot mechanism can drive the valve stem assembly to move in the second housing to change the connection state between the flow channel holes, thereby realizing the reversing operation of the electromagnetic pilot four-way valve. Since there is a set angle between the first housing and the second housing, the extension directions of the first housing and the second housing are different, that is, the electromagnetic pilot four-way valve is in a bent shape. This arrangement makes the overall length of the pilot four-way valve relatively smaller, so that the installation space occupied in the length direction is smaller. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 A cross-sectional view of an electromagnetic pilot-operated four-way valve provided in an embodiment of the present invention when it is in a power-off state;

[0024] Figure 2 for Figure 1 A partial enlarged view of the pilot mechanism;

[0025] Figure 3 for Figure 1 A partial enlarged view of the second shell;

[0026] Figure 4 A cross-sectional view of an electromagnetic pilot-operated four-way valve provided in an embodiment of the present invention when it is in an energized state;

[0027] Figure 5 A top view of an electromagnetic pilot-operated four-way valve provided in an embodiment of the present invention.

[0028] In the figure: 11 - first housing; 12 - second housing; 13 - first passage; 14 - pressure relief hole; 15 - end cover; 16 - bottom cover; 17 - second sealing ring; 18 - adapter; 20 - pilot mechanism; 21 - sliding member; 22 - elastic buffer member; 23 - moving iron core; 24 - guide cylinder; 25 - electromagnetic coil; 26 - first sealing member; 27 - second sealing member; 28 - connecting rod; 31 - first blocking part; 32 - second blocking part; 33 - third blocking part; 34 - fourth blocking part; 35 - left valve stem; 36 - right valve stem; 37 - first sealing ring; 38 - sealing gasket; 41 - first chamber; 42 - second chamber; 43 - third chamber; 44 - fourth chamber; 45 - fifth chamber; 46 - sixth chamber; 47 - seventh chamber; 48 - eighth chamber; 50 - manual mechanism; 51 - rotating part; 61 - nut; 62 - stop structure; 63 - stud; 70 - wiring assembly; 81 - locking nut; 82 - connecting part; O - first flow channel hole; A - second flow channel hole; P - third flow channel hole; B - fourth flow channel hole. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0032] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the product of the invention is usually placed when in use, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the electromagnetic pilot-operated four-way valve or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0033] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0034] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0036] First embodiment

[0037] Please refer to Figures 1 to 5 The present embodiment provides an electromagnetic pilot-operated four-way valve, comprising: an outer shell, the outer shell comprising a first shell 11 and a second shell 12, the first shell 11 and the second shell 12 having an included angle of a set angle; a pilot mechanism 20 is installed in the inner cavity of the first shell 11; a valve stem assembly is installed in the inner cavity of the second shell 12, the second shell 12 has four flow channel holes, the inner cavity of the second shell 12 is divided into a plurality of chambers, and the pilot mechanism 20 is used to drive the valve stem assembly to move in the second shell 12 to change the on-off state between the chamber and the flow channel hole.

[0038] Preferably, the angle between the central axis of the first shell 11 and the central axis of the second shell 12 is 90 degrees. This arrangement makes the length direction of the first shell 11 perpendicular to the length direction of the second shell 12. When the electromagnetic pilot-operated four-way valve is assembled into the system, the flow channel hole on the second shell 12 is connected to other equipment in the system, and the first shell 11 is perpendicular to the second shell 12, so that the position of the first shell 11 is closer to the connection between the second shell 12 and other equipment.

[0039] In a specific implementation of this embodiment, the valve stem assembly may include only one valve stem, and a plurality of blocking portions are provided on the valve stem, and the plurality of blocking portions divide the inner cavity of the second housing 12 into a plurality of chambers. The inner cavity of the first housing 11 is connected with the inner cavity of the second housing 12, and after the pilot mechanism 20 in the first housing 11 is started, the gas enters the inner cavity of the second housing 12 through the inner cavity of the first housing 11, thereby driving the valve stem assembly to move, so as to change the connection state between each chamber and different flow channel holes, thereby changing the connection state between the plurality of flow channel holes, and further changing the flow direction of the fluid passing through the electromagnetic pilot four-way valve.

[0040] Or, in a preferred embodiment, Figure 1 As shown, the second housing 12 has two inner chambers, the valve stem assembly includes two valve stems, and the valve stem includes a stem portion and a blocking portion arranged on the stem portion. The two valve stems are installed in the two inner cavities of the second shell 12 in a one-to-one manner. The sealing part on the valve stem divides the corresponding inner cavity into multiple chambers. The two ends of the valve stem are respectively a first end and a second end. The first shell 11 is provided with a pressure relief hole 14, which is connected to the inner cavity of the first shell 11; the flow channel hole includes an air inlet hole, which is respectively connected to the chambers where the first ends of the two valve stems are located, and the air inlet hole is connected to the chamber of the first shell 11 through a first passage 13; the inner cavity of the first shell 11 is connected to the chamber where the second end of the valve stem is located through a second passage, and the cross-sectional area of ​​the chamber where the second end of the valve stem is located in the direction perpendicular to the movement of the valve stem is larger than the cross-sectional area of ​​the chamber where the first end of the valve stem is located in the direction perpendicular to the movement of the valve stem; the pilot mechanism 20 includes an electromagnetic coil 25 and a moving iron core assembly, and the electromagnetic coil 25 is energized to drive the moving iron core assembly to move relative to the electromagnetic coil 25 to block the first passage 13 or the pressure relief hole 14.

[0041] For details, please refer to Figure 1 and Figure 2In the direction shown, the second housing 12 has two inner chambers, which are respectively called the left inner chamber and the right inner chamber. The valve stem installed in the left inner chamber is called the left valve stem 35, and the valve stem installed in the right inner chamber is called the right valve stem 36. The left valve stem 35 and the right valve stem 36 are symmetrically arranged. The first end of the left valve stem 35 is located on the left side, and the second end is located on the right side; the first end of the right valve stem 36 is located on the right side, and the second end is located on the left side. The left valve stem 35 is provided with a first blocking portion 31 and a second blocking portion 32 from left to right, and the right valve stem 36 is provided with a second blocking portion 32 and a third blocking portion 33 from left to right.

[0042] Two partitions are provided in the left inner cavity, and the two partitions divide the left inner cavity into three chambers. The first blocking portion 31 is located in the leftmost chamber and divides the chamber into two chambers, so the left inner cavity is divided into four chambers in total. For the convenience of description, they are respectively called the first chamber 41, the second chamber 42, the third chamber 43 and the fourth chamber 44. Both the partitions are provided with through holes, and the rod of the left valve stem 35 passes through the through holes, and there is a gap between the through holes. The first blocking portion 31 is located at the leftmost side of the left inner cavity and is used to separate the first chamber 41 and the second chamber 42. The third chamber 43 is between the two partitions. The second blocking portion 32 is located in the third chamber 43, and there is a gap between the second blocking portion 32 and the inner wall of the third chamber 43.

[0043] Similarly, two partitions are provided in the right inner cavity, and the two partitions divide the right inner cavity into three chambers. The fourth blocking portion 34 is located in the rightmost chamber and divides the chamber into two chambers, so that a total of four chambers are formed in the inner cavity. For the convenience of description, they are respectively called the fifth chamber 45, the sixth chamber 46, the seventh chamber 47 and the eighth chamber 48. Both the partitions are provided with through holes, and the stem of the right valve stem 36 passes through the through holes, and there is a gap between the two through holes. The fourth blocking portion 34 is located at the rightmost side of the right inner cavity, and is used to separate the seventh chamber 47 and the eighth chamber 48. The sixth chamber 46 is between the two partitions of the right inner cavity. The third blocking portion 33 is located in the fifth chamber 45, and there is a gap between the inner wall of the fifth chamber 45.

[0044] For ease of description, the four flow channel holes are respectively referred to as the first flow channel hole O, the second flow channel hole A, the third flow channel hole P and the fourth flow channel hole B from left to right, wherein the third flow channel hole P is the above-mentioned air inlet hole. The first flow channel hole O is connected to the second chamber 42, the second flow channel hole A is connected to the third chamber 43, the fourth flow channel hole B is connected to the sixth flow channel hole, the third flow channel hole P is connected to the fourth chamber 44 and the fifth chamber 45, and the seventh chamber 47 is connected to the first flow channel hole O through the first process hole (due to the section angle problem, the first process hole is not shown in the figure). The third flow channel hole P is connected to the first passage 13 through the second process hole (due to the section angle problem, the second process hole is not shown in the figure). The inner cavity of the first shell 11 is connected to the first chamber 41 and the eighth chamber 48 respectively through the second passage (due to the section angle problem, the second passage is not shown in the figure).

[0045] like Figure 1 As shown, when the electromagnetic coil 25 is in the power-off state, the moving iron core assembly is blocked in the first passage 13, that is, the third flow channel hole P is disconnected from the inner cavity of the first shell 11. At this time, the medium flows into the fourth chamber 44 and the fifth chamber 45 through the third flow channel hole P, and the medium in the fourth chamber 44 pushes the left valve stem 35 to the left, so that the second blocking portion 32 blocks the through hole between the second chamber 42 and the third chamber 43, and the through hole between the third chamber 43 and the fourth chamber 44 is opened. The medium in the fifth chamber 45 pushes the right valve stem 36 to the right, so that the third blocking portion 33 blocks the through hole between the fifth chamber 45 and the sixth chamber 46, and the through hole between the sixth chamber 46 and the seventh chamber 47 is opened. In this way, the third flow channel hole P is connected to the second flow channel hole A via the fourth chamber 44 and the third chamber 43, and the first flow channel hole O and the fourth flow channel hole B are connected to the sixth chamber 46 via the first process hole and the seventh chamber 47. As shown Figure 1 As shown by the dotted arrow, the medium flowing in through the third flow channel hole P first enters the fourth chamber 44, then enters the fifth chamber 45 through the through hole, and finally flows out through the second flow channel hole A. The medium flowing in through the first flow channel hole O first enters the seventh chamber 47 through the first process hole, then enters the sixth chamber 46 through the through hole, and finally flows out through the fourth flow channel hole B. Alternatively, the medium flowing in through the fourth flow channel hole B first enters the sixth chamber 46, then enters the seventh chamber 47 through the through hole, then enters the first process hole through the seventh chamber 47, and finally flows out through the first flow channel hole O.

[0046] like Figure 4As shown, when the electromagnetic coil 25 is energized, the moving iron core assembly moves, blocks the pressure relief hole 14, and opens the first passage 13. Then, part of the medium entering the third flow channel hole P enters the fourth chamber 44, part enters the fifth chamber 45, and another part enters the first passage 13 through the second process hole, enters the inner cavity of the first housing 11 through the first passage 13, and enters the first chamber 41 and the eighth chamber 48 through the second passage. Since the cross-sectional area of ​​the chamber where the second end of the valve stem is located in the direction perpendicular to the movement of the valve stem is larger than the cross-sectional area of ​​the chamber where the first end of the valve stem is located in the direction perpendicular to the movement of the valve stem, that is, the cross-sectional area of ​​the first blocking portion 31 is larger than the cross-sectional area of ​​the second blocking portion 32, when the media are the same, the larger the contact surface, the greater the force, so the force of the medium in the first chamber 41 on the left valve stem 35 is greater than the force of the fourth chamber 44, so that the left valve stem 35 moves to the right, and the second blocking portion 32 opens the through hole between the second chamber 42 and the third chamber 43, and blocks the through hole between the third chamber 43 and the fourth chamber 44. Similarly, since the force of the medium in the eighth chamber 48 on the right valve stem 36 is greater than the force of the medium in the fifth chamber 45, the right valve stem 36 moves to the left, the fourth blocking portion 34 blocks the through hole between the sixth chamber 46 and the seventh chamber 47, and the third blocking portion 33 opens the through hole between the fifth chamber 45 and the sixth chamber 46.

[0047] In this configuration, the medium entering through the third flow channel hole P first enters the fifth chamber 45, and then enters the sixth chamber 46 through the fifth chamber 45, and finally flows out through the fourth flow channel hole B. The medium entering through the first flow channel hole O first enters the second chamber 42, and then enters the third chamber 43 through the through hole, and finally flows out through the second flow channel hole A.

[0048] In a preferred embodiment, a sealing pad 38 is provided on the end surface of the blocking portion, and a first sealing ring 37 is provided on the blocking portion at the second end of the valve stem. Specifically, the first sealing ring 37 is a Y-shaped ring. Such a configuration makes the sealing effect better.

[0049] Preferably, the end surface of the blocking portion is provided with a receiving groove, the sealing gasket 38 is installed in the receiving groove, a part of the sealing gasket 38 extends out of the receiving groove, and the width of the receiving groove is smaller than the width of the sealing gasket 38. Figure 3 As shown, the cross-sectional shape of the accommodating groove is the same as that of the sealing gasket 38 , both of which are T-shaped structures. The internal space of the accommodating groove is large and the opening is relatively small, so that the accommodating groove plays a better limiting role for the sealing gasket 38 .

[0050] like Figure 2As shown, a guide cylinder 24 is provided in the first housing 11, and the moving iron core assembly includes a moving iron core 23 and a sliding member 21. The sliding member 21 is slidably assembled with the guide cylinder 24, and a reset elastic member is connected between the sliding member 21 and the moving iron core 23. When the electromagnetic coil 25 is energized, the moving iron core 23 moves upward relative to the sliding member 21 under the action of the electromagnetic force, thereby opening the first passage 13, and at this time the reset elastic member is compressed and stored. After the first passage 13 is opened, the medium enters the inner cavity of the first housing 11 through the first passage 13, thereby pushing the sliding member 21 to move upward to block the pressure relief hole 14. When the electromagnetic coil 25 is de-energized, under the action of the reset elastic member, the moving iron core 23 moves downward to block the first passage 13. After the medium no longer enters the first housing 11 through the first passage 13, the sliding member 21 moves downward under the action of gravity to open the pressure relief hole 14.

[0051] In a preferred embodiment of the present invention, a first seal 26 is disposed at one end of the sliding member 21 facing the pressure relief hole 14, the moving iron core 23 has a second seal 27, and the moving iron core assembly further includes a connecting rod 28, and an elastic buffer 22 is disposed between the connecting rod 28 and the first seal 26 and the second seal 27. The elastic buffer 22 can be a spring.

[0052] In a preferred embodiment, Figure 1 and Figure 2 As shown, the electromagnetic pilot-operated four-way valve further includes a manual mechanism 50, which includes a rotating portion 51, the axial direction of the rotating portion 51 is perpendicular to the moving direction of the moving iron core assembly, the side surface of the rotating portion 51 contacts the edge area of ​​the end surface of the moving iron core 23 facing the second housing 12, and the rotation of the rotating portion 51 can push the moving iron core assembly to move away from the second housing 12. Specifically, the cross section of the rotating portion 51 can be an eccentric circle, or a non-circular shape, such as an elliptical cross section.

[0053] Furthermore, in another feasible implementation manner, the manual mechanism 50 may further include a bearing, and the rotating portion 51 is connected to the first housing 11 via the bearing.

[0054] To facilitate the assembly of the valve stem assembly and the pilot mechanism 20, preferably, the first shell 11 and the second shell 12 are connected by an adapter 18, the two ends of the second shell 12 are respectively connected to the end cover 15 and the bottom cover 16, the end cover 15 is connected to the adapter 18, and a second sealing ring 17 is respectively provided between the second shell 12 and the end cover 15, between the second shell 12 and the bottom cover 16, between the bottom cover 16 and the adapter 18, and between the adapter 18 and the first shell 11.

[0055] Preferably, the end cover 15, the bottom cover 16, and the adapter 18 are all provided with sealing grooves, the second sealing ring 17 is installed in the sealing groove, and a part of the second sealing ring 17 extends out of the sealing groove. Such a configuration makes the sealing effect better.

[0056] like Figure 1 and Figure 5 As shown, the second housing 12 and the end cover 15, as well as the second housing 12 and the bottom cover 16 are connected by a connector, which includes a stud 63, a nut 61 and a stop structure 62, and the nut 61 and the stop structure 62 are both sleeved on the stud 63. Specifically, the stop structure 62 can be a stop gasket. This arrangement makes the connection stability of the connector stronger, thereby making the structural stability of the electromagnetic pilot four-way valve stronger and the anti-seismic performance better.

[0057] In this embodiment, the sealing structures such as the first sealing ring 37, the second sealing ring 17, the sealing gasket 38, the first sealing member 26 and the second sealing member 27 are all made of flexible materials, preferably, made of high temperature resistant and radiation resistant non-metallic materials, such as epoxy resin, fluororubber, and EPDM rubber.

[0058] like Figure 5 As shown, a wiring assembly 70 is also installed on the side of the first housing 11, and the wiring assembly 70 is electrically connected to the electromagnetic coil 25 to supply power to the electromagnetic coil 25. The wiring assembly 70 is used to connect to the external power grid. Specifically, the wiring assembly 70 can be a quick connector, a cable crimping form, or an explosion-proof connector. The explosion-proof grade of the wiring assembly 70 meets the Ex dⅡCT5Gb standard.

[0059] The electromagnetic pilot solenoid valve provided in this embodiment meets the following conditions:

[0060] Nuclear safety level: 1E, identification level: K1, K2, K3;

[0061] Radiation resistant working conditions, the cumulative radiation dose can meet 850KGy;

[0062] Resistant to electromagnetic compatibility conditions, meeting the use conditions of RG1.180-2003, MIL-STD-461E-1999 and IEC61000;

[0063] Earthquake-resistant working conditions, seismic grade: 1A, earthquake acceleration 7.2g (6g with 1.2 times margin), and meets the seismic parameters of "Hualong One";

[0064] The operating conditions that meet the "Hualong One" design basis accident (LOCA) parameters.

[0065] like Figure 2As shown, a locking nut 81 is installed on the first shell 11, and a connecting portion 82 is installed in the first shell 11. The upper part of the connecting portion 82 extends out of the first shell 11 to be connected with the locking nut 81. The connecting portion 82 is provided with a step, and the connecting portion 82 contacts the guide cylinder 24 through its step, and the top area of ​​the guide cylinder 24 overlaps the step of the connecting portion 82. The bottom of the guide cylinder 24 is provided with a step, and the guide cylinder 24 contacts the adapter 18 through the step at the bottom. Specifically, the adapter 18 includes a first section and a second section, the first section is sleeved on the outside of the second section, a sealing ring is provided between the first section and the second section, and the second section and the first shell are sealed by a second sealing ring 17. The top area of ​​the second section overlaps the step of the guide cylinder 24.

[0066] After the locking nut 81 is loosened, the first housing 11 can rotate around its own central axis, that is, the first housing 11 rotates relative to the guide cylinder 24, thereby changing the position of the wiring assembly 70. After the locking nut 81 is tightened, the locking nut 81 causes the connecting portion 82 to move upward during the locking process, that is, the connecting portion 82 causes the guide cylinder 24 to move upward, thereby making the second section of the adapter 18 more closely abut against the first housing 11, and the adapter 18 and the locking nut 81 clamp the first housing 11 from both sides of the first housing 11, thereby fixing the first housing 11 to prevent the first housing 11 from rotating during use.

[0067] The electromagnetic pilot-operated four-way valve provided in this embodiment can be applied to nuclear-grade pneumatic devices.

[0068] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An electromagnetic pilot-operated four-way valve, characterized in that: include: A housing, the housing comprising a first housing and a second housing, wherein a set angle is formed between the first housing and the second housing; A pilot mechanism is installed in the inner cavity of the first shell; a valve stem assembly is installed in the inner cavity of the second shell, the second shell has four flow channel holes, the inner cavity of the second shell is divided into a plurality of chambers, and the pilot mechanism is used to drive the valve stem assembly to move in the second shell to change the on-off state between the chamber and the flow channel hole; The first shell is provided with a pressure relief hole, and the pressure relief hole is communicated with the inner cavity of the first shell; The second housing has two inner chambers, the valve stem assembly includes two valve stems, the two valve stems are mounted in the two inner chambers of the second housing in a one-to-one correspondence, the valve stems divide the corresponding inner chambers into a plurality of chambers, and the two ends of the valve stem are respectively a first end and a second end; The flow channel hole includes an air inlet hole, the air inlet holes are respectively connected to the chambers where the first ends of the two valve stems are located, and the air inlet holes are connected to the chamber of the first shell through a first passage; the inner cavity of the first shell is connected to the chamber where the second end of the valve stem is located through a second passage, and the cross-sectional area of ​​the chamber where the second end of the valve stem is located in a direction perpendicular to the movement of the valve stem is larger than the cross-sectional area of ​​the chamber where the first end of the valve stem is located in the direction perpendicular to the movement of the valve stem; The pilot mechanism comprises an electromagnetic coil and a moving iron core assembly, and the electromagnetic coil is energized to drive the moving iron core assembly to move relative to the electromagnetic coil to block the first passage or the pressure relief hole; The first shell and the second shell are connected through an adapter, and the two ends of the second shell are respectively connected with an end cover and a bottom cover, the end cover is connected to the adapter, and a second sealing ring is respectively provided between the second shell and the end cover, between the second shell and the bottom cover, between the bottom cover and the adapter, and between the adapter and the first shell.

2. The electromagnetic pilot-operated four-way valve according to claim 1, characterized in that: A guide cylinder is arranged in the first housing, and the moving iron core assembly comprises a moving iron core and a sliding member. The sliding member is slidably assembled with the guide cylinder, and a reset elastic member is connected between the sliding member and the moving iron core.

3. The electromagnetic pilot-operated four-way valve according to claim 2, characterized in that: A first seal is disposed at one end of the sliding member facing the pressure relief hole, the moving iron core has a second seal, and the moving iron core assembly further includes a connecting rod, and elastic buffers are disposed between the connecting rod and the first seal and the second seal.

4. The electromagnetic pilot-operated four-way valve according to claim 1, characterized in that: The valve stem comprises a stem portion and a blocking portion arranged on the stem portion, the end surface of the blocking portion is provided with a sealing gasket, and the blocking portion at the second end of the valve stem is sleeved with a first sealing ring.

5. The electromagnetic pilot-operated four-way valve according to claim 4, characterized in that: The end surface of the blocking portion is provided with a receiving groove, the sealing gasket is installed in the receiving groove, a partial area of ​​the sealing gasket extends out of the receiving groove, and the width of the receiving groove is smaller than the width of the sealing gasket.

6. The electromagnetic pilot-operated four-way valve according to any one of claims 1 to 5, characterized in that: It also includes a manual mechanism, which includes a rotating part, the axial direction of the rotating part is perpendicular to the moving direction of the moving iron core assembly, the side surface of the rotating part is in contact with the edge area of ​​the end surface of the moving iron core facing the second shell, and the rotation of the rotating part can push the moving iron core assembly to move in a direction away from the second shell.

7. The electromagnetic pilot-operated four-way valve according to claim 1, characterized in that: The end cover, the bottom cover and the adapter are all provided with sealing grooves, the second sealing ring is installed in the sealing groove, and a part of the second sealing ring extends out of the sealing groove.

8. The electromagnetic pilot-operated four-way valve according to claim 1, characterized in that: The second shell and the end cover, as well as the second shell and the bottom cover are connected via a connecting piece, and the connecting piece includes a stud, a nut and a retaining structure, and the nut and the retaining structure are both sleeved on the stud.

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