A small safety solenoid valve for deep wells

Abstract

The present invention provides a small safety solenoid valve for deep wells, which comprises an electromagnetic coil assembly, a valve body, a movable iron core and a coil housing; the electromagnetic coil assembly includes a metal skeleton, the metal skeleton is provided with a medium inlet at the upper end, and a pressure-resistant cavity communicating with the medium inlet is arranged inside it; the valve body is threadedly connected to the lower end of the metal skeleton, one end of the valve body is provided with a valve port communicating with the pressure-resistant cavity, and a valve port sealing assembly is installed at the valve port, and the valve port sealing assembly is limited between the valve body and the metal skeleton; the movable iron core is slidably installed in the pressure-resistant cavity, and a sealing cone for opening and closing the valve port is arranged at one end of the movable iron core facing the valve port sealing assembly; the coil housing is sleeved outside the electromagnetic coil assembly, and the upper and lower ends of the coil housing are respectively fixedly welded to the metal skeleton through welding parts; the small safety solenoid valve for deep wells provided by the present invention overcomes the defect that the existing small safety solenoid valve is not suitable for a depth of 3,000 meters.

Description

Technical Field

[0001] The present invention relates to the field of solenoid valves, and particularly to a small safety solenoid valve for deep wells. Background Art

[0002] The application fields of solenoid valves are becoming more and more extensive, and have been widely carried out in industrial automation, artificial intelligence manufacturing, medical instruments, etc. The analysis of the composition and content of the water quality of each underground water layer has been successively carried out in various countries. At present, the detection and analysis technology of groundwater within one kilometer is relatively mature, and the supporting equipment can basically meet the requirements. With the development of science and technology, scientists have further increased the requirement for the detection depth, hoping to reach the limit detection depth of 3,000 meters, which poses extremely harsh requirements on the detector, especially on the solenoid valve.

[0003] The small safety solenoid valve is an important component in the deep well detector, which plays a role in discharging pressure in real time under deep well conditions and escorts the detector. When the detector reaches a depth of 3,000 meters, the small safety solenoid valve not only has to withstand the impact of an external high pressure of 30 MPa, but also has to withstand the impact of an internal pressure source of 45 MPa, which is a challenge to its rigidity, sealing performance, switching performance, etc. The existing small safety solenoid valves cannot be applied to a depth of 3,000 meters, so improvement is needed. Summary of the Invention

[0004] (I) Technical Problems to be Solved

[0005] The problem to be solved by the present invention is to provide a small safety solenoid valve for deep wells to overcome the defect that the existing small safety solenoid valves are not suitable for a depth of 3,000 meters.

[0006] (II) Technical Solutions

[0007] To solve the above technical problems, the present invention provides a small safety solenoid valve for deep wells, including:

[0008] An electromagnetic coil assembly, including an integral metal skeleton; the metal skeleton is provided with a medium inlet at the upper end, and a pressure-resistant cavity communicating with the medium inlet is arranged inside.

[0009] A valve body, threadedly connected to the lower end of the metal skeleton; one end of the valve body facing the metal skeleton is provided with a valve port communicating with the pressure-resistant cavity, a valve port sealing assembly is installed at the valve port, and the valve port sealing assembly is limited between the valve body and the metal skeleton.

[0010] A movable iron core, slidably installed in the pressure-resistant cavity; one end of the movable iron core facing the valve port sealing assembly is provided with a sealing cone for opening and closing the valve port.

[0011] A coil housing made of an integral metal material is sleeved outside the electromagnetic coil assembly; the upper and lower ends of the coil housing are respectively welded and fixed to the metal skeleton through welding parts.

[0012] In some embodiments, a winding part is recessed on the outer circumferential wall of the metal skeleton, a plastic insulating layer is wrapped on the wall surface of the winding part, and a coil is wound on the plastic insulating layer.

[0013] In some embodiments, fastening seats are respectively threadedly connected to the upper and lower ends of the coil housing, and two first sealing rings arranged inside and outside are installed in the fastening seats; the two first sealing rings are respectively located on both sides of the welding part and are used for sealing the welding part.

[0014] In some embodiments, a creepage distance is formed between the inner wall of the coil housing and the coil, and a filling cavity is provided in the coil housing, and the filling cavity penetrates the creepage distance; an insulating sealant is poured into the filling cavity, and a pouring port communicated with the filling cavity is arranged on one side of the coil housing, and the insulating sealant is poured into the filling cavity through the pouring port.

[0015] In some embodiments, a sealing cover plate for covering the pouring port is installed on one side of the coil housing, the sealing cover plate is detachably connected to the coil housing through a plurality of fastening screws, and a second sealing ring is installed between the sealing cover plate and the coil housing.

[0016] In some embodiments, a watertight connector is installed on the coil housing, and the watertight connector is electrically connected to the coil through a connecting wire; the connecting wire is placed in the filling cavity, and the connecting wire is arranged at an interval from the inner wall of the coil housing; the watertight connector is hermetically connected to the coil housing through a sealing joint, and the sealing joint is threadedly connected to the coil housing.

[0017] In some embodiments, the valve port sealing assembly includes a sealing pressure seat fixed between the valve body and the metal skeleton and a valve port sealing member installed in the sealing pressure seat, and the valve port sealing member corresponds to the valve port; a contraction part is provided on the metal skeleton at a position corresponding to the sealing pressure seat, and the contraction part presses down the sealing pressure seat so that the valve port sealing member tightly abuts against the end face of the valve body.

[0018] In some embodiments, the movable iron core includes an iron core main body and the sealing cone fixed at the center of the lower end of the iron core main body. A spring groove and a T-shaped pressure balance hole communicating with each other are provided in the iron core main body, and the T-shaped pressure balance hole is located below the spring groove; an iron core spring is installed between the movable iron core and the metal skeleton, and the iron core spring makes the sealing cone always tend to move towards the valve port sealing assembly.

[0019] In some embodiments, an anti-collision filter is threadedly connected to the bottom of the valve body. A plurality of reinforcing ribs are annularly and equidistantly arranged on the outer wall of the anti-collision filter, and a filter screen is arranged inside the anti-collision filter; a medium outlet communicating with the valve port is arranged at the lower end of the valve body, and an outlet built-in filter screen is installed in the medium outlet.

[0020] In some embodiments, an inlet tee is installed at the medium inlet. A bursting disc is installed on one side of the inlet tee, an inlet joint is installed at the upper end of the inlet tee, and an inlet built-in filter screen is installed in the medium inlet.

[0021] (III) Beneficial effects.

[0022] A small safety solenoid valve for deep wells provided by the present invention has the following advantages compared with the prior art.

[0023] 1) Laser welding is used to deeply weld the coil housing and the metal skeleton, which can greatly improve the rigidity and pressure resistance of the coil housing. The welding process also provides the first sealing protection for the coil housing; first sealing rings are respectively placed at the two welding positions and are pressed and fixed with the fastening seat to ensure the sealing between the coil housing and the metal skeleton, and also provide the second sealing for the welding positions; a metal skeleton made of metal material has extremely high rigidity and pressure-bearing capacity; the structure of the metal skeleton combined with the plastic insulating layer replaces the traditional structure of the plastic skeleton and the magnetic isolation tube, simplifies the magnetic isolation tube component, makes the moving iron core closer to the coil, and greatly improves the suction force, thus improving the switching performance.

[0024] 2) The watertight connector is reinforced and sealed with a sealed joint. After insulating sealant is poured into the filling cavity, not only the strength of the overall solenoid valve is improved, but also the insulation performance and sealing performance are enhanced; a sealed cover plate is installed at the pouring port for sealing and fixing, forming the third sealing.

[0025] 3) The flow channel design that combines the spring groove and the T-shaped pressure balance hole enables the moving iron core not to be affected by the lack of fluid release when the medium enters the solenoid valve cavity and affects its up and down movement; the design of the T-shaped pressure balance hole enables the moving iron core to be steadily in the central position without deviation when moving and rotating; the valve port seal is installed in the sealing seat and is snapped into the metal skeleton by an interference fit method to ensure concentricity; under the action of the pre-tightening force of the valve body, the valve port seal is pressed tightly. As the pre-tightening force increases, the up and down positions of the valve port seal are tightly pressed and sealed under the action of the interference amount. The valve port seal cooperates with the sealing cone, and the solenoid valve opens and closes reliably with stable internal leakage. Brief description of the drawings

[0026] To more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0027] Figure 1 It is a schematic structural diagram of a small safety solenoid valve for deep wells according to the present invention.

[0028] Figure 2 It is a schematic structural diagram of an electromagnetic coil assembly of a small safety solenoid valve for deep wells according to the present invention.

[0029] Figure 3 It is a schematic structural diagram of the connection between an electromagnetic coil assembly and a coil housing of a small safety solenoid valve for deep wells according to the present invention.

[0030] Figure 4 It is a schematic structural diagram of the connection between a coil housing and a watertight connector of a small safety solenoid valve for deep wells according to the present invention.

[0031] Figure 5 It is a schematic structural diagram of the creepage distance of a small safety solenoid valve for deep wells according to the present invention.

[0032] Figure 6 It is a schematic structural diagram of a sealing cover plate of a small safety solenoid valve for deep wells according to the present invention.

[0033] Figure 7 It is a schematic structural diagram of a movable iron core of a small safety solenoid valve for deep wells according to the present invention.

[0034] Figure 8 It is a schematic structural diagram of a valve port sealing assembly of a small safety solenoid valve for deep wells according to the present invention.

[0035] Figure 9 It is a schematic structural diagram of the inside of an anti-collision filter of a small safety solenoid valve for deep wells according to the present invention.

[0036] Figure 10 It is a schematic structural diagram of the bottom view of an anti-collision filter of a small safety solenoid valve for deep wells according to the present invention.

[0037] Figure 11 It is a schematic structural diagram of an inlet tee of a small safety solenoid valve for deep wells according to the present invention.

[0038] The component names corresponding to the reference numerals in the figures are as follows: 1. Electromagnetic coil assembly; 11. Metal skeleton; 12. Plastic insulation layer; 13. Coil; 101. Medium inlet; 102. Pressure-resistant cavity; 103. Winding part; 104. Shrinkage part; 2. Valve body; 201. Valve port; 202. Medium outlet; 3. Valve port sealing assembly; 31. Sealing seat; 32. Valve port seal; 4. Moving iron core; 41. Sealing cone; 42. Iron core body; 43. Iron core spring; 401. Spring groove; 402. T-shaped pressure balance hole; 5. Coil housing; 51. Fastening seat; 52. First sealing ring; 53. Sealing cover plate; 54. Fastening screw; 55. Second sealing ring; 501. Welding part; 502. Filling cavity; 503. Pouring port; 6. Watertight connector; 61. Sealing joint; 601. Connecting wire; 7. Anti-collision filter; 71. Reinforcing rib; 72. Filter net; 73. Outlet built-in filter net; 8. Inlet tee; 81. Burst valve; 82. Inlet joint; 83. Inlet built-in filter net. Detailed implementation mode

[0039] The present application will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0040] The following illustrates the implementation modes of the present application through specific specific examples. Those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific implementation modes. The details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts belong to the scope of protection of the present application.

[0041] It should be noted that the following describes various aspects of the embodiments within the scope of the appended claims. It should be obvious that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is illustrative only. Based on the present application, those skilled in the art should understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspects described herein can be used to implement the device and / or practice the method. Additionally, this device and / or this method can be implemented using other structures and / or functionality in addition to one or more of the aspects described herein.

[0042] It should also be noted that the illustrations provided in the following embodiments only schematically illustrate the basic concept of the present application. The illustrations only show the components related to the present application, rather than being drawn according to the number, shape, and size of the components in actual implementation. The types, quantities, and proportions of the components in actual implementation can be arbitrarily changed, and the component layout type may also be more complex.

[0043] In addition, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that the examples can be practiced without these specific details.

[0044] The following describes the technical solutions provided by each embodiment of the present application with reference to the accompanying drawings.

[0045] Refer to Figures 1 to 11 , the present invention provides a small safety solenoid valve for deep wells, including an electromagnetic coil assembly 1, a valve body 2, a valve port sealing assembly 3, a movable iron core 4, and a coil housing 5.

[0046] Refer to Figure 1 and Figure 2 , the electromagnetic coil assembly 1 includes an integral metal skeleton 11, and the metal skeleton 11 can be made of stainless steel. The metal skeleton 11 is provided with a medium inlet 101 at the upper end, and the medium can enter from the medium inlet 101. The metal skeleton 11 is provided with a pressure-resistant cavity 102 communicated with the medium inlet 101 inside.

[0047] Refer to Figure 1 and Figure 8 , the valve body 2 is threadedly connected to the lower end of the metal skeleton 11. The lower end of the metal skeleton 11 is provided with internal threads, and the valve body 2 is connected to the metal skeleton 11 through the internal threads. Part of the valve body 2 is placed inside the metal skeleton 11. To ensure the sealing performance, a sealing ring is installed between the valve body 2 and the metal skeleton 11. One end of the valve body 2 facing the metal skeleton 11 is provided with a valve port 201 communicated with the pressure-resistant cavity 102, and a valve port sealing assembly 3 is installed at the valve port 201. The valve port sealing assembly 3 is limited between the valve body 2 and the metal skeleton 11; by tightening the valve body 2, the valve port sealing assembly 3 can be installed in an interference fit at the valve port 201.

[0048] Refer to Figure 1 and Figure 3 , the movable iron core 4 is slidably installed in the pressure-resistant cavity 102. One end of the movable iron core 4 facing the valve port sealing assembly 3 is provided with a sealing cone 41 for opening and closing the valve port 201. The coil housing 5 is a metal part with an integral structure, for example, it can be made of iron. The coil housing 5 is sleeved outside the electromagnetic coil assembly 1, and the upper and lower ends of the coil housing 5 are respectively welded and fixed to the metal skeleton 11 through welding parts 501; the coil housing 5 and the metal skeleton 11 can be welded and fixed by laser welding, so as to increase the rigidity and ensure the pressure-resistant ability.

[0049] In some embodiments, such as Figure 2 shown, a wire winding portion 103 is recessed on the outer circumferential wall of the metal skeleton 11. A plastic insulating layer 12 is wrapped on the wall surface of the wire winding portion 103, and a coil 13 is wound around the plastic insulating layer 12.

[0050] The present invention breaks the convention that the coil skeleton of a conventional solenoid valve only uses insulating materials (such as plastics). The metal skeleton 11 made of metal material has extremely high rigidity and pressure-bearing capacity of components. To achieve extremely high insulation performance, the surface of the metal skeleton 11 is wrapped with insulating engineering plastics to achieve a withstand voltage impact of more than 2000V. The bottom of the metal skeleton 11 of the present invention is sealed, and a pressure of 45 MPa is applied at the medium inlet 101. There is no pressure loss in the pressure-resistant cavity 102, and both the pressure-resistant strength and the sealing ability meet the design requirements. In addition, the structure of the metal skeleton 11 cooperating with the plastic insulating layer 12 replaces the structure of the traditional plastic skeleton with a magnetic isolation tube, simplifies the component of the magnetic isolation tube, makes the moving iron core 4 closer to the coil 13, the moving component closer to the magnetic field, and the suction force will be greatly improved. The increase in the pressure-resistant ability and the switching ability level lays a solid foundation for small low-power solenoid valves.

[0051] In some embodiments, such as Figure 3 and Figure 4 shown, fastening seats 51 are respectively threadedly connected to the upper and lower ends of the coil housing 5. External threads are respectively provided at the upper and lower ends of the coil housing 5, and the fastening seats 51 are connected to the outside of the coil housing 5 through the external threads. Two first sealing rings 52 arranged inside and outside are installed in the fastening seats 51. The two first sealing rings 52 are respectively located on both sides of the welding part 501 and are used to seal the welding part 501. With this structure, when the fastening seat 51 is tightened, the first sealing ring 52 can be deformed, so as to seal both sides of the welding part 501 and ensure the sealing performance.

[0052] The present invention needs to work for a long time under the condition of a deep well of 3000 meters. The coil housing 5 has to withstand the impact of an external water pressure of 30 MPa, which puts very high requirements on the strength of the coil housing 5. Using the coil housing 5 made of metal material and the metal skeleton 11, and performing deep welding on the position of the welding part 501 by using high-power laser welding can greatly improve the pressure-resistant strength of the coil housing 5, and the welding process also provides the first sealing protection for the coil housing 5. In addition, the present invention respectively places two first sealing rings 52 at the upper and lower welding positions of the coil housing 5 and the metal skeleton 11, and presses and fixes them with the fastening seats 51, ensuring the sealing of the connection between the coil housing 5 and the metal skeleton 11 and providing the second sealing for the welding position.

[0053] In some embodiments, such as Figures 3 to 6As shown in the figure, a creepage gap H is formed between the inner wall of the coil housing 5 and the coil 13. The coil housing 5 has a filling cavity 502. The axis of the filling cavity 502 is perpendicular to the axis of the electromagnetic coil assembly 1, and the filling cavity 502 penetrates the creepage gap H. The filling cavity 502 is filled with an insulating sealant. One side of the coil housing 5 is provided with a filling port 503 communicating with the filling cavity 502, and the insulating sealant is poured into the filling cavity 502 through the filling port 503. A sealing cover plate 53 for covering the filling port 503 is installed on one side of the coil housing 5. The sealing cover plate 53 is detachably connected to the coil housing 5 by a plurality of fastening screws 54, and a second sealing ring 55 is installed between the sealing cover plate 53 and the coil housing 5. A watertight connector 6 is installed on the coil housing 5. The watertight connector 6 is electrically connected to the coil 13 through a connecting wire 601. The connecting wire 601 is placed in the filling cavity 502, and the connecting wire 601 is arranged at intervals with the inner wall of the coil housing 5. The watertight connector 6 is hermetically connected to the coil housing 5 through a sealing joint 61, and the sealing joint 61 is threadedly connected to the coil housing 5.

[0054] The sealing of the electromagnetic coil lead-out wire (watertight connector) and the coil housing is also a key point. In the present invention, the sealing joint 61 is first used for reinforcement sealing, and then the insulating sealant is poured at the filling port 503 on the side to fill the filling cavity 502 with glue. After curing, not only the strength of the overall solenoid valve is improved, but also the insulation performance and sealing performance are enhanced. Finally, the sealing cover plate 53 is installed at the filling port 503 for sealing and fixing, forming a third sealing.

[0055] The solenoid valve after the above combined glue injection is placed in a container, and a pressure of 35 MPa is applied at the pressure port. After maintaining the pressure for 24 hours, it is taken out to ensure that the solenoid valve has no deformation and no leakage. At the same time, to ensure good insulation ability, a certain electrical clearance space (creepage gap H) is left. The insulating sealant has filled this position, and the insulation ability still reaches more than 2000 V. The solenoid valve that has passed the pressure test is tested for switching performance, sealing performance, etc., and all performances are normal.

[0056] In some embodiments, as Figure 1 and Figure 8 shown, the valve port sealing assembly 3 includes a sealing seat 31 fixed between the valve body 2 and the metal skeleton 11 and a valve port seal 32 installed in the sealing seat 31. The valve port seal 32 corresponds to and communicates with the valve port 201. The metal skeleton 11 is provided with a contraction portion 104 at the position corresponding to the sealing seat 31. The contraction portion 104 presses down the sealing seat 31 so that the valve port seal 32 tightly abuts against the end face of the valve body 2.

[0057] Existing solenoid valve orifice seals are all installed on the moving iron core, and the movement of the moving iron core is used to drive the orifice seal to seal the orifice. To meet the best internal leakage requirements, the present invention adopts the idea of reverse design. The orifice seal 32 is installed in the sealing seat 31, and then is clamped into the metal skeleton 11 by an interference fit method to ensure concentricity. Finally, under the action of the pre-tightening force of the valve body 2, the orifice seal 32 is pressed tightly. As the pre-tightening force increases, the upper and lower positions of the orifice seal 32 are tightly pressed and sealed under the action of the interference amount. At this time, the orifice seal 32 is centered and has excellent sealing performance, laying a solid foundation for the downward movement and sealing fit of the moving iron core 4. Only when the orifice seal 32 is fixed concentrically and has reliable sealing can the stability of the internal leakage of the solenoid valve be ensured.

[0058] In some embodiments, such as Figure 1 and Figure 7 shown, the moving iron core 4 includes an iron core main body 42 and a sealing cone 41 fixed at the center of the lower end of the iron core main body 42. A spring groove 401 and a T-shaped pressure balance hole 402 that communicate with each other are provided in the iron core main body 42. The T-shaped pressure balance hole 402 is located below the spring groove 401. An iron core spring 43 is installed between the moving iron core 4 and the metal skeleton 11. The iron core spring 43 is located in the spring groove 401, and the iron core spring 43 makes the sealing cone 41 always tend to move towards the orifice seal assembly 3.

[0059] To meet the best internal leakage requirements of the solenoid valve, the iron core main body 42 is made of soft magnetic alloy material, and the sealing cone 41 is made of hard alloy material. The soft magnetic alloy and the hard alloy are welded and combined to make the sealing cone 41 have higher strength. At the same time, to meet the concentricity requirements, the welded assembly is machined again to ensure the up and down concentricity of the moving iron core. The flow channel design with the cooperation of the spring groove 401 and the T-shaped pressure balance hole 402 is adopted, so that after the medium enters the solenoid valve cavity, the moving iron core will not be affected by the lack of release of the fluid and affect its up and down movement. The design of the T-shaped pressure balance hole 402 enables the moving iron core to be steadily in the central position without deviation when moving and rotating.

[0060] In some embodiments, such as Figure 1 、 Figure 9 and Figure 10 shown, an anti-collision filter 7 is threadedly connected to the bottom of the valve body 2. The bottom of the valve body 2 is provided with an external thread, and the anti-collision filter 7 is threadedly connected to the outside of the valve body 2 through the external thread. A plurality of reinforcing ribs 71 are annularly and equally spaced on the outer wall of the anti-collision filter 7. A filter screen 72 is provided inside the anti-collision filter 7. A medium outlet 202 communicating with the orifice 201 is provided at the lower end of the valve body 2, and an outlet built-in filter screen 73 is installed in the medium outlet 202.

[0061] There are many uncertain factors during the process of the detector going down the well. Slight collisions and vibrations are quite common during the downward movement, and the solenoid valve is in direct contact with the underground substances. The present invention adopts an integrally anti-collision filter with relatively strong rigidity, which is provided with six reinforcing ribs around it and has a relatively high strength; multiple micropores are drilled on the curved surfaces between the reinforcing ribs to eliminate the influence caused by unclean water quality; at the same time, a second filtering device (filter screen 72) is arranged inside the anti-collision filter to prevent garbage outside the solenoid valve from entering the solenoid valve; a third filter screen (inlet built-in filter screen 73) is also arranged at the medium outlet of the valve body, with layer-by-layer filtration and good filtration effect. At the same time, under the strong rigid protection of the anti-collision filter, it can block slight bruises and ensure that the solenoid valve does not have accidents.

[0062] In some embodiments, as Figure 1 and Figure 11 shown, an inlet tee 8 is installed at the medium inlet 101. A bursting disc 81 is installed on one side of the inlet tee 8, an inlet connector 82 is installed at the upper end of the inlet tee 8, and an inlet built-in filter screen 83 is installed inside the medium inlet 101.

[0063] The present invention uses a bursting disc with an extremely high safety level to solve the problem that the detector cannot be recovered accidentally after going down the well. When the solenoid valve fails to relieve pressure, the external power source outside the well pressurizes to the maximum pressure of the bursting disc, triggering the bursting disc to burst automatically and releasing the internal pressure of the detector instantly, facilitating the detector to be taken out of the well smoothly. While protecting the deep well, it also saves certain resources.

[0064] The usage process of this small safety solenoid valve for deep wells is as follows.

[0065] The medium inlet of the solenoid valve is connected to the medium pressure, the watertight connector 6 is connected to the specified voltage, the coil 13 generates a magnetic field, the movable iron core 4 moves upward against the spring force of the iron core, the sealing cone 41 is separated from the valve port seal 32, the valve port 201 is opened, and the medium sprays out from the medium outlet 202, and the solenoid valve is opened. When the coil 13 is powered off and the electromagnetic field disappears, the movable iron core 4 moves downward under the action of the iron core spring 43, the sealing cone 41 blocks the valve port seal 32, the valve port 201 is closed, the medium is disconnected, and the solenoid valve is in the closed state.

[0066] For the same and similar parts among the various embodiments in this specification, reference can be made to each other. Each embodiment focuses on the differences from other embodiments.

[0067] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed in the present application should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A small safety solenoid valve for deep wells, characterized in that: include: An electromagnetic coil assembly (1) comprises an integrated metal frame (11); the metal frame (11) is provided with a medium inlet (101) at the upper end, and a pressure-resistant chamber (102) is provided inside the metal frame and is connected to the medium inlet (101); A valve body (2) is threadedly connected to the lower end of the metal frame (11); one end of the valve body (2) facing the metal frame (11) is provided with a valve port (201) communicating with the pressure-resistant chamber (102); a valve port sealing assembly (3) is installed at the valve port (201); the valve port sealing assembly (3) is limited between the valve body (2) and the metal frame (11); A movable iron core (4) is slidably mounted in the pressure-resistant chamber (102); one end of the movable iron core (4) facing the valve port sealing assembly (3) is provided with a sealing cone (41) for opening and closing the valve port (201); An integrated metal coil housing (5) is sleeved on the outside of the electromagnetic coil assembly (1); the upper and lower ends of the coil housing (5) are respectively welded and fixed to the metal frame (11) via welding portions (501); the upper and lower ends of the coil housing (5) are respectively threadedly connected to a fastening seat (51), and two first sealing rings (52) arranged inside and outside are installed in the fastening seat (51); the two first sealing rings (52) are respectively located on both sides of the welding portion (501) and are used to seal the welding portion (501); A winding portion (103) is formed in an inwardly concave shape on the outer circumferential wall of the metal skeleton (11), a plastic insulating layer (12) is wrapped on the wall surface of the winding portion (103), and a coil (13) is wound on the plastic insulating layer (12); a creepage gap (H) is formed between the inner wall of the coil housing (5) and the coil (13), and a filling cavity (502) is provided in the coil housing (5), and the filling cavity (502) passes through the creepage gap (H); the filling cavity (502) is filled with insulating sealant, and a filling port (503) connected to the filling cavity (502) is provided on one side of the coil housing (5), and the insulating sealant is poured into the filling cavity (502) through the filling port (503); A sealing cover plate (53) for covering the filling port (503) is installed on one side of the coil housing (5); the sealing cover plate (53) is detachably connected to the coil housing (5) via a plurality of fastening screws (54); a second sealing ring (55) is installed between the sealing cover plate (53) and the coil housing (5); a watertight connector (6) is installed on the coil housing (5); the watertight connector (6) is electrically connected to the coil (13) via a connecting wire (601); the connecting wire (601) is placed in the filling cavity (502), and the connecting wire (601) and the inner wall of the coil housing (5) are arranged at intervals; the watertight connector (6) is sealedly connected to the coil housing (5) via a sealing joint (61), and the sealing joint (61) is threadedly connected to the coil housing (5).

2. The small safety solenoid valve for deep wells as claimed in claim 1, characterized in that: The valve port sealing assembly (3) comprises a sealing seat (31) fixed between the valve body (2) and the metal frame (11), and a valve port sealing member (32) installed in the sealing seat (31), wherein the valve port sealing member (32) corresponds to the valve port (201); the metal frame (11) is provided with a contraction portion (104) at a position corresponding to the sealing seat (31), wherein the contraction portion (104) presses down the sealing seat (31) so that the valve port sealing member (32) is tightly pressed against the end face of the valve body (2).

3. The small safety solenoid valve for deep wells according to claim 1, characterized in that: The movable iron core (4) comprises an iron core body (42) and the sealing cone (41) fixed at the center of the lower end of the iron core body (42), and the iron core body (42) is provided with a spring groove (401) and a T-shaped pressure balance hole (402) that are interconnected, and the T-shaped pressure balance hole (402) is located at the lower side of the spring groove (401); An iron core spring (43) is installed between the movable iron core (4) and the metal frame (11), and the iron core spring (43) enables the sealing cone (41) to always have a tendency to move towards the valve port sealing assembly (3).

4. The small safety solenoid valve for deep wells as claimed in claim 1, characterized in that: The bottom of the valve body (2) is threadedly connected to an anti-collision filter (7); a plurality of reinforcing ribs (71) are arranged at equal intervals in an annular manner on the outer wall of the anti-collision filter (7); a filter screen (72) is arranged inside the anti-collision filter (7); a medium outlet (202) communicating with the valve port (201) is arranged at the lower end of the valve body (2); an outlet built-in filter screen (73) is installed inside the medium outlet (202).

5. The small safety solenoid valve for deep wells as claimed in claim 1, characterized in that: An inlet tee (8) is installed at the medium inlet (101), a burst valve (81) is installed on one side of the inlet tee (8), an inlet joint (82) is installed at the upper end of the inlet tee (8), and an inlet built-in filter (83) is installed in the medium inlet (101).

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