Small safety electromagnetic valve for deep well

Abstract

The invention provides a small safety electromagnetic valve for a deep well. The small safety electromagnetic valve comprises an electromagnetic coil assembly, a valve body, a movable iron core and a coil shell. The electromagnetic coil assembly comprises a metal framework, a medium inlet is formed in the upper end of the metal framework, and a pressure-resistant cavity communicated with the medium inlet is formed in the metal framework; the valve body is in threaded connection with the lower end of the metal framework, a valve port communicated with the pressure-resistant cavity is formed in one end of the valve body, 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 framework; the movable iron core is slidably mounted in the pressure-resistant cavity, and a sealing cone used for opening and closing the valve port is arranged at the end, facing the valve port sealing assembly, of the movable iron core. The coil shell is sleeved outside the electromagnetic coil assembly, and the upper end and the lower end of the coil shell are respectively welded and fixed with the metal framework through welding parts; according to the small safety electromagnetic valve for the deep well, the defect that an existing small safety electromagnetic valve is not suitable for the depth of three kilometers is overcome.

Description

Technical Field

[0001] The invention relates to the field of electromagnetic valves, in particular to a small safety electromagnetic valve for deep wells. Background Art

[0002] The application fields of solenoid valves are becoming more and more extensive, and industrial automation, artificial intelligence, medical instruments, etc. have been widely developed. The analysis of the composition and content of water quality in various underground water layers has been carried out in various countries. From the current point of view, the detection and analysis technology of groundwater within one thousand meters is relatively mature, and the supporting equipment can basically meet the requirements. With the development of science and technology, scientists have further improved their requirements for detection depth, hoping to reach the ultimate detection depth of three thousand meters, which puts extremely stringent requirements on detectors, especially solenoid valves.

[0003] Small safety solenoid valves are important components in deep well detectors. They play a role in real-time pressure discharge under deep well conditions, protecting the detector. When the detector reaches a depth of three kilometers, the small safety solenoid valve must not only withstand the impact of 30MPa external high pressure, but also the impact of 45MPa internal pressure source, which is a challenge to its rigidity, sealing, switching performance, etc. The existing small safety solenoid valves are not suitable for a depth of three kilometers, so they need to be improved. Summary of the invention

[0004] 1. 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, so as to overcome the defect that the existing small safety solenoid valve is not suitable for a depth of three thousand meters.

[0006] (2) Technical solution

[0007] In order to solve the technical problem, the present invention provides a small safety solenoid valve for deep wells, including.

[0008] The electromagnetic coil assembly comprises an integrated metal frame; the metal frame is provided with a medium inlet at the upper end, and a pressure-resistant cavity connected with the medium inlet is provided inside the metal frame.

[0009] The valve body is threadedly connected to the lower end of the metal skeleton; a valve port connected to the pressure-resistant chamber is arranged at one end of the valve body facing the metal skeleton, 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 is slidably mounted in the pressure-resistant cavity; 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.

[0011] An integrated metal coil shell is mounted outside the electromagnetic coil assembly; the upper and lower ends of the coil shell are respectively welded and fixed to the metal frame through welding parts.

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

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

[0014] In some embodiments, a creepage gap 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 passes through the creepage gap; the filling cavity is filled with insulating sealant, and a filling port connected to the filling cavity is provided on one side of the coil housing, and the insulating sealant is poured into the filling cavity through the filling port.

[0015] In some embodiments, a sealing cover plate for covering the filling port is installed on one side of the coil housing, the sealing cover plate is detachably connected to the coil housing via 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 shell, 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 and the inner wall of the coil shell are arranged at intervals; the watertight connector is sealed with the coil shell through a sealing joint, and the sealing joint is threadedly connected to the coil shell.

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

[0018] In some embodiments, the movable iron core includes an iron core body and the sealing cone fixed at the center of the lower end of the iron core body, and the iron core body is provided with a spring groove and a T-shaped pressure balance hole that are interconnected, and the T-shaped pressure balance hole is located at the lower side of the spring groove; an iron core spring is installed between the movable iron core and the metal frame, and the iron core spring makes the sealing cone always tend to move toward the valve port sealing assembly.

[0019] In some embodiments, the bottom thread of the valve body is connected to an anti-collision filter, a plurality of reinforcing ribs are arranged in an annular manner at equal intervals on the outer wall of the anti-collision filter, and a filter screen is arranged inside the anti-collision filter; a medium outlet connected to 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 burst valve 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 is installed in the medium inlet.

[0021] (III) Beneficial effects.

[0022] The 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 perform deep welding on the coil shell and the metal frame, which can greatly improve the rigidity and compressive strength of the coil shell, and the welding process also provides the first sealing protection for the coil shell; the first sealing ring is placed at the two welding positions respectively, and is pressed and fixed with the fastening seat to ensure the sealing of the connection between the coil shell and the metal frame, and also provides the second sealing for the welding position; the metal frame made of metal material has extremely high component rigidity and pressure bearing capacity; the structure of the metal frame with a plastic insulation layer replaces the traditional plastic frame with a magnetic isolation tube structure, which simplifies the magnetic isolation tube components, makes the movable iron core closer to the coil, greatly improves the suction force, and improves the switch performance.

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

[0025] 3) The flow channel design with spring groove and T-shaped pressure balance hole is adopted, so that after the medium enters the solenoid valve cavity, the movable iron core will not be affected by the up and down movement due to the fluid having nowhere to release; the design of T-shaped pressure balance hole makes the movable iron core stable in the center position without deviation during movement and rotation; the valve port seal is installed in the sealing seat, and then inserted into the metal frame by interference fit to ensure concentricity; under the action of the valve body preload, the valve port seal is compressed, and as the preload increases, the upper and lower positions of the valve port seal are tightly compressed and sealed under the action of the interference amount, and the valve port seal cooperates with the sealing cone, the solenoid valve is reliable to open and close, and the internal leakage is stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

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

[0028] Figure 2 The present invention is a structural schematic diagram of a solenoid coil assembly of a small safety solenoid valve for deep wells.

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

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

[0031] Figure 5 The present invention is a structural schematic diagram of a creepage clearance of a small safety solenoid valve for deep wells.

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

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

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

[0035] Fig. 9 The present invention is a schematic diagram of the structure inside a small safety solenoid valve anti-collision filter for deep wells.

[0036] Fig.10 This is a structural schematic diagram of a small safety solenoid valve anti-collision filter for deep wells from a bottom perspective of the present invention.

[0037] Fig.11 The present invention is a schematic structural diagram of an inlet tee of a small safety solenoid valve for deep wells.

[0038] The names of the components corresponding to the reference numerals in the figure are: 1. electromagnetic coil assembly; 11. metal frame; 12. plastic insulation layer; 13. coil; 101. medium inlet; 102. pressure-resistant chamber; 103. winding part; 104. contraction part; 2. valve body; 201. valve port; 202. medium outlet; 3. valve port sealing assembly; 31. sealing pressure seat; 32. valve port sealing member; 4. movable iron core; 41. sealing cone; 42. iron core body; 43. iron core spring; 401. spring groove; 402. 02. 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. Filling port; 6. Watertight connector; 61. Sealing joint; 601. Connecting line; 7. Anti-collision filter; 71. Reinforcement rib; 72. Filter screen; 73. Built-in filter screen at outlet; 8. Inlet tee; 81. Burst valve; 82. Inlet joint; 83. Built-in filter screen at inlet. DETAILED DESCRIPTION

[0039] The present application is described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] The following describes the implementation methods of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents 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 methods, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, in the absence of conflict, the following embodiments and the features in the embodiments can be combined with each other. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work belong to the scope of protection of the present application.

[0041] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on the present application, it should be understood by those skilled in the art that an 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 aspect described herein can be used to implement the device and / or practice the method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this device and / or practice this method.

[0042] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of 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. In actual implementation, the type, quantity and proportion of each component may be changed at will, and the component layout may also be more complicated.

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

[0044] The technical solutions provided by various embodiments of the present application are described below in conjunction with the accompanying drawings.

[0045] See also Figures 1 to 11 The present invention provides a small safety solenoid valve for deep wells, comprising a solenoid coil assembly 1, a valve body 2, a valve port sealing assembly 3, a movable iron core 4 and a coil housing 5.

[0046] See also Figure 1 and Figure 2 The electromagnetic coil assembly 1 includes an integrated metal frame 11, which can be made of stainless steel. The metal frame 11 is provided with a medium inlet 101 at the upper end, and the medium can enter from the medium inlet 101. The metal frame 11 is provided with a pressure-resistant chamber 102 connected to the medium inlet 101.

[0047] See also Figure 1 and Figure 8 The valve body 2 is threadedly connected to the lower end of the metal frame 11. The lower end of the metal frame 11 is provided with an internal thread. The valve body 2 is connected to the metal frame 11 through the internal thread, and the valve body 2 is partially placed inside the metal frame 11. In order to ensure the sealing performance, a sealing ring is installed between the valve body 2 and the metal frame 11. The end of the valve body 2 facing the metal frame 11 is provided with a valve port 201 connected to the pressure-resistant chamber 102, and a valve port sealing component 3 is installed at the valve port 201. The valve port sealing component 3 is limited between the valve body 2 and the metal frame 11; by tightening the valve body 2, the valve port sealing component 3 can be installed at the valve port 201 with interference fit.

[0048] See also Figure 1 and Figure 3 The movable iron core 4 is slidably installed in the pressure-resistant chamber 102, and a sealing cone 41 for opening and closing the valve port 201 is provided at one end of the movable iron core 4 facing the valve port sealing assembly 3. The coil housing 5 is a metal part of an integrated structure, for example, it can be made of iron. The coil housing 5 is mounted on the outside of the electromagnetic coil assembly 1, and the upper and lower ends of the coil housing 5 are respectively welded and fixed to the metal frame 11 through welding parts 501; the coil housing 5 and the metal frame 11 can be welded and fixed by laser welding, thereby increasing the rigidity and ensuring the pressure resistance.

[0049] In some embodiments, Figure 2 As shown, a winding portion 103 is formed inwardly on the outer circumferential wall of the metal skeleton 11 , and 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 .

[0050] The present invention breaks the convention that the conventional solenoid valve coil skeleton only uses insulating materials (such as plastics), and uses a metal skeleton 11 made of metal material, which has extremely high component rigidity and pressure-bearing capacity; in order to achieve extremely high insulation performance, the surface of the metal skeleton 11 is wrapped with insulating engineering plastics to achieve a pressure-bearing impact of more than 2000V. The present invention seals the bottom of the metal skeleton 11, applies a pressure of 45MPa at the medium inlet 101, and there is no pressure loss in the pressure-bearing chamber 102, and the pressure-bearing strength and sealing ability meet the design requirements. In addition, the structure of the metal skeleton 11 combined with the plastic insulating layer 12 is used to replace the structure of the traditional plastic skeleton combined with the magnetic isolation tube, which simplifies the magnetic isolation tube component, so that the movable iron core 4 is closer to the coil 13, and the moving parts are closer to the magnetic field. The suction force will be greatly improved, and the pressure-bearing capacity and switching capacity will increase in magnitude, laying a solid foundation for small and low-power solenoid valves.

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

[0052] The present invention needs to work for a long time in a deep well of 3000 meters, and the coil housing 5 must withstand the impact of 30MPa of external water pressure, which places very high requirements on the strength of the coil housing 5. The coil housing 5 and the metal frame 11 are made of metal, and high-power laser welding is used to perform deep welding on the welding part 501, which can greatly improve the compressive strength of the coil housing 5. The welding process also provides the first sealing protection for the coil housing 5. In addition, the present invention places two first sealing rings 52 at the upper and lower welding positions of the coil housing 5 and the metal frame 11, and fixes them with a fastening seat 51, which ensures the sealing of the connection between the coil housing 5 and the metal frame 11, and also provides a second sealing for the welding position.

[0053] In some embodiments, Figures 3 to 6As shown, 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. The axis of the filling cavity 502 is perpendicular to the axis of the electromagnetic coil assembly 1, and the filling cavity 502 passes through the creepage gap H. Insulating sealant is poured into the filling cavity 502, and a pouring port 503 communicating with 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 pouring port 503. A sealing cover plate 53 for covering the pouring port 503 is installed on one side of the coil housing 5, and 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, and 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 and the inner wall of the coil housing 5 are arranged at intervals; the watertight connector 6 is sealed and 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 between the electromagnetic coil lead wire (watertight connector) and the coil housing is also a key point. The present invention first uses a sealing joint 61 to reinforce the seal, and then injects insulating sealant at the side injection port 503 to fill the filling cavity 502 with glue. After curing, not only the strength of the overall electromagnetic valve is improved, but also the insulation performance and sealing performance are improved; finally, a sealing cover plate 53 is installed at the injection port 503 for sealing and fixing, forming a third seal.

[0055] Place the above-mentioned combined glue-filled solenoid valve in a container, add 35MPa pressure to the pressure port, and take it out after maintaining the pressure for 24 hours to ensure that the solenoid valve has no deformation and no leakage. At the same time, in order to ensure better insulation ability, a certain electrical gap space (creepage gap H) is left. The insulating sealant has filled this position, and the insulation ability still reaches more than 2000V. The solenoid valve that has undergone pressure testing is tested for switching performance, sealing performance, etc., and all performances are normal.

[0056] In some embodiments, Figure 1 and Figure 8 As shown, the valve port sealing assembly 3 includes a sealing seat 31 fixed between the valve body 2 and the metal frame 11 and a valve port seal 32 installed in the sealing seat 31, and the valve port seal 32 corresponds to and is connected 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, and the contraction portion 104 presses down the sealing seat 31 so that the valve port seal 32 is tightly pressed against the end face of the valve body 2.

[0057] The existing solenoid valve port seals are all installed on the movable iron core, and the movement of the movable iron core drives the valve port seal to seal the valve port. In order to achieve the best internal leakage requirements, the present invention adopts the idea of ​​reverse design, installs the valve port seal 32 in the sealing seat 31, and then uses interference fit to clamp it into the metal frame 11 to ensure concentricity; finally, under the action of the pre-tightening force of the valve body 2, the valve port seal 32 is compressed, and as the pre-tightening force increases, the upper and lower positions of the valve port seal 32 are tightly compressed and sealed under the action of the interference amount. At this time, the valve port seal 32 is centered and has excellent sealing, laying a solid foundation for the downward movement of the movable iron core 4 to seal; only when the valve port seal 32 is fixed concentrically and the seal is reliable, can the stability of the internal leakage of the solenoid valve be ensured.

[0058] In some embodiments, Figure 1 and Figure 7 As shown, the movable iron core 4 includes an iron core body 42 and a 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 which 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 skeleton 11, and the iron core spring 43 is located in the spring groove 401. The iron core spring 43 makes the sealing cone 41 always have a tendency to move toward the valve port sealing assembly 3.

[0059] In order to achieve the best internal leakage requirement of the solenoid valve, the core body 42 is made of soft magnetic alloy, and the sealing cone 41 is made of hard alloy. The soft magnetic alloy and the hard alloy are welded together to make the sealing cone 41 stronger. At the same time, to ensure the concentricity requirement, the welded assembly is processed again to ensure that the movable core is concentric up and down. The flow channel design with 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 movable core will not be affected by the upward and downward movement due to the fluid having nowhere to release. The design of the T-shaped pressure balance hole 402 allows the movable core to be stably in the center position without deviation during movement and rotation.

[0060] In some embodiments, Figure 1 , Fig. 9 and Fig.10 As shown, the bottom of the valve body 2 is threadedly connected with an anti-collision filter 7, and 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 arranged at equal intervals in an annular manner on the outer wall of the anti-collision filter 7, and a filter screen 72 is arranged inside the anti-collision filter 7; the lower end of the valve body 2 is provided with a medium outlet 202 connected to the valve port 201, and an outlet built-in filter screen 73 is installed in the medium outlet 202.

[0061] There are many uncertain factors in the process of the detector going down the well, and slight collisions and shaking are common during the downward movement, while the solenoid valve is in direct contact with the material in the well. The present invention adopts an integrated anti-collision filter with strong rigidity, which is surrounded by six reinforcing ribs and has great strength; multiple micropores are punched on the curved surface 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 (built-in filter screen 73 at the outlet) is arranged at the outlet of the valve body medium, which filters layer by layer and has a good filtering effect. At the same time, under the strong rigid protection of the anti-collision filter, it can prevent slight bumps and ensure that the solenoid valve does not have accidents.

[0062] In some embodiments, Figure 1 and Fig.11 As shown, 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 .

[0063] The present invention adopts a bursting valve with an extremely high safety level to solve the problem of the detector being unable to be recovered unexpectedly after being lowered into the well. When the solenoid valve fails and cannot release the pressure, the power source outside the well increases the pressure to the maximum pressure of the bursting valve, triggering the bursting valve to automatically explode and instantly release the internal pressure of the detector, so that the detector can be smoothly removed from the well, 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 overcomes the iron core spring force and moves upward, the sealing cone 41 is separated from the valve port seal 32, the valve port 201 is opened, the medium is ejected from the medium outlet 202, and the solenoid valve is opened. When the coil 13 is powered off, 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 a closed state.

[0066] The same and similar parts between the various embodiments in this specification can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0067] The above is only a specific implementation 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 a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on 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 onto 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).

2. The small safety solenoid valve for deep wells as claimed in claim 1, characterized in that: A winding portion (103) is formed inwardly on the outer circumferential wall of the metal skeleton (11), a wall surface of the winding portion (103) is wrapped with a plastic insulating layer (12), and a coil (13) is wound on the plastic insulating layer (12).

3. The small safety solenoid valve for deep wells according to claim 1, characterized in that: 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).

4. The small safety solenoid valve for deep wells as claimed in claim 2, characterized in that: A creepage gap (H) is formed between the inner wall of the coil housing (5) and the coil (13); a filling cavity (502) is provided in the coil housing (5); the filling cavity (502) passes through the creepage gap (H); the filling cavity (502) is filled with insulating sealant; a filling port (503) communicating with the filling cavity (502) is provided on one side of the coil housing (5); the insulating sealant is poured into the filling cavity (502) through the filling port (503).

5. The small safety solenoid valve for deep wells as claimed in claim 4, characterized in that: 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); and a second sealing ring (55) is installed between the sealing cover plate (53) and the coil housing (5).

6. The small safety solenoid valve for deep wells as claimed in claim 4, characterized in that: A watertight connector (6) is installed on the coil housing (5), and 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).

7. 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).

8. The small safety solenoid valve for deep wells as claimed in 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).

9. 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).

10. The small safety solenoid valve for deep wells according to 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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