Electromagnetic valve for petroleum sampling instrument

Abstract

The present application relates to the technical field of petroleum sampling instrument, disclose a kind of solenoid valve for petroleum sampling instrument, comprising: valve body and solenoid valve seat;Nut is set on valve body, and valve body is installed on solenoid valve seat to form integrated structure;Valve core assembly is arranged in valve body, changes the flow direction of hydraulic oil in solenoid valve, controls the flow direction of hydraulic oil in solenoid valve, so that petroleum sampling instrument is according to the operation of operator to carry out pressure measurement in the intended position of oil well;Valve body includes integrally-formed valve sleeve framework, shell is set on valve sleeve framework, a certain gap is reserved between shell inner wall and valve sleeve framework outer wall, enameled wire is set on valve sleeve framework and located in gap, valve needle seat is detachably connected with valve sleeve framework;The present device is assembled using plug-in assembly mode, when one or more parts are damaged, the operator disassembles and replaces the damaged parts of solenoid valve, to avoid replacing the whole solenoid valve to cause resource waste.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of petroleum sampling instruments, and particularly relates to an electromagnetic valve for a petroleum sampling instrument. BACKGROUND

[0002] Petroleum logging is to detect and find petroleum, natural gas and other mineral resources in a well with a diameter of only tens of centimeters and a depth of thousands of meters or even ten thousand meters according to relevant physical principles such as electricity, sound and nuclear radiation; and the hydraulic element used in the petroleum logging instrument is an indispensable instrument in the process of petroleum exploration and sampling, which plays an important role in the control and efficiency improvement of the logging instrument. In the process of petroleum logging, it is necessary to sample, explore and measure the pressure of petroleum or other fluids in the petroleum well, so it is necessary to use an electromagnetic valve to control the hydraulic oil accordingly, so that the sampling instrument can complete the corresponding work according to the operation of the operator.

[0003] A hydraulic support device for a cased well is disclosed in Chinese Patent No. CN110424914A, which comprises a balance outer cylinder, a balance piston arranged inside the balance outer cylinder and in sliding connection with the inner wall of the balance outer cylinder, a lead tube arranged in the balance outer cylinder, an electric wire arranged in the lead tube, a support frame arranged inside the balance outer cylinder, a pressure bearing disc fixedly connected with the bottom of the support frame, a motor fixed on the support frame and connected with the electric cable through the electric wire, a shaft coupling connected with the output end of the motor, a hydraulic pump connected with the shaft coupling, an overflow valve connected with the output end of the hydraulic pump, a three-way valve connected with the overflow valve, an electromagnetic reversing valve I and an electromagnetic reversing valve II connected with the three-way valve respectively, the electromagnetic reversing valve I being connected to the support unit through a hydraulic pipe I via the pressure bearing disc, the electromagnetic reversing valve II being connected to the support unit through a hydraulic pipe II via the pressure bearing disc, and the pressure bearing disc being fixedly connected with the balance outer cylinder.

[0004] In the above patent, the hydraulic element arranged can realize the corresponding control work of the sampling instrument, but because the hydraulic element will leave metal chips, burrs, welding slag and the like during processing and assembly, these residues will be washed by hydraulic oil and fall into the hydraulic oil with the vibration of the machine to become pollutants when the hydraulic system is working; during work, the meshing transmission of the oil pump gear, the sliding wear between the hydraulic oil cylinder and the piston, the opening and closing of each slide valve and the like will all produce wear particles, and when the hydraulic oil cylinder is working, the piston reciprocates continuously, when the piston rod is outside the cylinder, it directly contacts with the air, which is easy to bring the dust particles in the outside into the hydraulic oil, thereby causing damage to the electromagnetic valve, and the existing electromagnetic valve is mostly of compact structure, so when the electromagnetic valve is damaged, the whole electromagnetic valve needs to be replaced, which increases the cost of petroleum logging and increases the difficulty of maintenance of the electromagnetic valve for the operator.

[0005] Therefore, how to replace the damaged parts in the electromagnetic valve of the oil sampling instrument is a problem to be solved at present. SUMMARY

[0006] The application provides an electromagnetic valve for an oil sampling instrument to solve the above problems in the prior art.

[0007] An electromagnetic valve for an oil sampling instrument, comprising:

[0008] a valve body and an electromagnetic valve seat;

[0009] a nut is sleeved on the valve body and is used for mounting the valve body on the electromagnetic valve seat to form an integrated structure;

[0010] a valve core assembly is arranged in the valve body and is used for changing the flow direction of hydraulic oil in the electromagnetic valve, so that the oil sampling instrument can complete the pressure measurement at a predetermined position in the oil well according to the operation of an operator; the valve body and the electromagnetic valve seat are made of high-temperature and high-pressure resistant materials, and in the actual working process, the enamelled wire and the sealing ring (selected from different temperature materials) can be replaced according to the temperature and pressure resistance requirements, so that electromagnetic valve products with different temperature and pressure resistance can be made.

[0011] In a further embodiment, the valve body comprises an integrally formed valve sleeve skeleton, a shell sleeved on the valve sleeve skeleton, a certain gap reserved between the inner wall of the shell and the outer wall of the valve sleeve skeleton, an enamelled wire sleeved on the valve sleeve skeleton and located in the gap, and a valve needle seat detachably connected with the valve sleeve skeleton.

[0012] The valve sleeve skeleton comprises a fixed iron core, a non-magnetic support and a flange, which are sequentially arranged in the direction close to the electromagnetic valve seat; the valve sleeve skeleton is a hollow structure, the valve needle seat is clamped with the fixed iron core, and the valve sleeve skeleton is used for connecting the valve needle seat and the electromagnetic valve seat;

[0013] A first channel for hydraulic oil passing through is formed in the valve needle seat;

[0014] The nut is sleeved on the shell and abuts against the flange, and the shell abuts against the flange;

[0015] The valve core assembly is arranged in the valve sleeve skeleton; and the shell is fixed on the valve sleeve skeleton by screws.

[0016] In a further embodiment, the electromagnetic valve seat comprises a base, a needle seat arranged on the base, a filter assembly arranged at the oil outlet end of the base, and an annular filter screen sleeved at the oil inlet end of the base.

[0017] The base is provided with a recess for placing the needle seat, and a first communication hole is further provided between the recess and the filter assembly.

[0018] The needle seat is provided with a second channel along the axial direction thereof, and a third channel in communication with the second channel, and the first communication hole is in communication with the third channel.

[0019] The valve core assembly is located in the second channel and has a preset gap with the inner wall of the second channel.

[0020] In a further embodiment, a plurality of oil inlet channels for connecting the recess and the outer wall of the base are further provided on the base, and a preset space is present between the end of the oil inlet channel away from the needle seat and the annular filter screen.

[0021] The inner wall of the recess is further provided with an annular flow guide groove for connecting the second communication hole and the end of the oil inlet channel close to the needle seat.

[0022] In a further embodiment, the filter assembly comprises an electromagnetic valve filter screen provided at the oil outlet end of the base, and a clasp spring for fixing the electromagnetic valve filter screen.

[0023] In a further embodiment, a first sealing ring is provided between the valve needle seat and the fixed iron core, a second sealing ring is provided between the flange and the valve seat of the electromagnetic valve, a third sealing ring and a fifth sealing ring are sequentially provided on the base in the direction away from the valve body, a fourth sealing ring is provided between the electromagnetic valve filter screen and the base, and a sixth sealing ring is provided between the needle seat and the inner wall of the recess.

[0024] In a further embodiment, the valve core assembly comprises a normally closed valve needle, a first return spring sleeved on the normally closed valve needle, and a first movable iron core sleeved on the first return spring.

[0025] The normally closed valve needle is provided with a plurality of first connecting ears, and a predetermined gap is present between adjacent first connecting ears, one end of the first return spring abuts against the first connecting ear, and the other end abuts against the valve needle seat, the first return spring is in a compressed state, and exerts a pushing force on the normally closed valve needle through the first connecting ear, so that the normally closed valve needle is displaced in the direction of the needle seat, thereby blocking the third channel on the needle seat.

[0026] In a further embodiment, the valve core assembly comprises a normally open valve needle, a second return spring sleeved on the normally open valve needle, a second movable iron core and a first static iron core which are sequentially provided on the normally open valve needle in the direction away from the valve body.

[0027] The normally open valve needle is provided with a plurality of second connecting ears, and a predetermined gap exists between adjacent second connecting ears, one end of the second reset spring abuts against the second connecting ear, and the other end abuts against the first static iron core, the second reset spring is in a compressed state, and a pushing force in the direction of the valve needle seat is applied to the normally open valve needle through the second connecting ear, so that the normally open valve needle is displaced in the direction of the valve needle seat and blocks the first channel on the valve needle seat.

[0028] In a further embodiment, the first static iron core extends away from the one end of the valve body in the direction away from the first static iron core to form an extension, and the extension abuts against the flange and the needle seat, respectively.

[0029] In a further embodiment, the fixed iron core can be replaced by a fixed core, and a sealing groove is formed in the fixed core, and the sealing groove has a reverse U-shaped structure.

[0030] The second movable iron core can be replaced by a third movable iron core, and the third movable iron core is located in the sealing groove formed in the fixed core, and a sliding groove is formed in the third movable iron core for the movement of the valve core assembly.

[0031] Beneficial effects: the electromagnetic valve for the petroleum sampling instrument is disclosed, during the assembly work, first, the screw cap is sleeved on the valve body, then the valve body is screwed into the electromagnetic valve seat through the screw cap, so that the valve body is installed on the electromagnetic valve seat, and the assembly work of the electromagnetic valve is completed, before the process, the operator needs to insert the valve core assembly into the valve sleeve framework, for the two-position three normally closed electromagnetic valve and the two-position three normally open electromagnetic valve, by inserting the valve needle seat into the fixed iron core, the sealing of one end of the valve core assembly is completed, and for the two-position two normally open electromagnetic valve, the fixed core is arranged for sealing, then the flange in the valve sleeve framework abuts against the electromagnetic valve seat, and then the installation of the valve core assembly is completed, and during the installation work of the electromagnetic valve seat, the needle seat can be inserted into the groove on the base, and one end of the valve core assembly is located in the needle seat, and then the position is fixed through the valve body, the device is assembled in the plug-in assembly mode, when one or more parts are damaged, the operator can disassemble and install the electromagnetic valve, so that the damaged parts can be replaced, and the waste of resources caused by replacing the whole electromagnetic valve is avoided; the device also has the characteristics of high temperature resistance, high pressure resistance, compact structure and small size; meanwhile, the two-position three normally closed electromagnetic valve, the two-position three normally open electromagnetic valve and the two-position two normally open electromagnetic valve in the device can be arranged in the petroleum sampling instrument according to the established order, the hydraulic oil flow mode in the two-position three normally closed electromagnetic valve, the two-position three normally open electromagnetic valve and the two-position two normally open electromagnetic valve is controlled, and then the petroleum sampling instrument can complete the corresponding petroleum exploration and pressure measurement work. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1It is a structural diagram of an electromagnetic valve for a petroleum sampling instrument.

[0033] Figure 2 It is a sectional view of the electromagnetic valve valve seat of the present application.

[0034] Figure 3 It is a sectional view of the valve body of the present application.

[0035] Figure 4 It is a sectional view of the first embodiment of the present application.

[0036] Figure 5 It is a sectional view of the second embodiment of the present application.

[0037] Figure 6 It is a sectional view of the third embodiment of the present application.

[0038] Figure 7 It is a sectional view of the valve core assembly of the first embodiment of the present application.

[0039] Figure 8 It is a sectional view of the valve core assembly of the second embodiment of the present application.

[0040] Figure 9 It is a sectional view of the valve core assembly of the third embodiment of the present application.

[0041] Reference signs: 1, nut; 2, electromagnetic valve valve seat; 21, base; 22, needle seat; 23, electromagnetic valve filter screen; 24, circlip; 25, annular filter screen; 26, third sealing ring; 27, fourth sealing ring; 28, fifth sealing ring; 29, sixth sealing ring; 210, first communication hole; 211, second communication hole; 212, second channel; 213, third channel; 3, valve body; 31, flange; 32, non-magnetic support; 33, fixed core; 34, valve needle seat; 35, enameled wire; 36, shell; 37, screw; 38, first sealing ring; 39, second sealing ring; 310, fixed core; 4, valve core assembly; 41, first movable core; 42, normally closed valve needle; 421, first connecting lug; 43, first return spring; 44, first static core; 45, second movable core; 46, second return spring; 47, second connecting lug; 48, normally open valve needle; 49, third movable core. DETAILED DESCRIPTION

[0042] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0043] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be recognized by one skilled in the art that the present application can be practiced without the specific details, or with an alternative combination of mechanisms. Thus, the present application is not intended to be limited by the embodiments set forth in the following description.

[0044] Secondly, the "one embodiment" or "an embodiment" referred to herein means a specific feature, structure, characteristic, or combination of features, structures, or characteristics that can be included in at least one implementation of the present application. The various appearances of "in one embodiment" or "in an embodiment" in the specification do not all refer to the same embodiment, however, although such phrasing can appear rerepeated in the specification. Inferences from this phrasing can be that all of the features described with that phrasing are present in one or more embodiments. Such phrasing in the specification does not necessarily refer to the same embodiment, however, and this application can be directed to multiple embodiments, and refers to "at least one" or "one or more" of the features, structures, or characteristics of the embodiments described throughout the specification.

[0045] The application discloses an electromagnetic valve for a petroleum sampling instrument, which comprises a valve body 3 and an electromagnetic valve valve seat 2, a nut 1 sleeved on the valve body 3 and used for mounting the valve body 3 on the electromagnetic valve valve seat 2 to form an integrated structure, and a valve core assembly 4 arranged in the valve body 3 and used for changing the flow direction of hydraulic oil in the electromagnetic valve. Figures 1-9

[0046] The valve body 3 and the electromagnetic valve valve seat 2; the nut 1 sleeved on the valve body 3 and used for mounting the valve body 3 on the electromagnetic valve valve seat 2 to form an integrated structure; and the valve core assembly 4 arranged in the valve body 3 and used for changing the flow direction of hydraulic oil in the electromagnetic valve.

[0047] ​The valve body 3 comprises an integrally formed valve sleeve framework, a shell 36 sleeved on the valve sleeve framework, a certain gap reserved between the inner wall of the shell 36 and the outer wall of the valve sleeve framework, an enameled wire 35 sleeved on the valve sleeve framework and located in the gap, and a valve needle seat 34 detachably connected with the valve sleeve framework; the valve sleeve framework comprises a fixed iron core 33, a non-magnetic support 32 and a flange 31, which are sequentially arranged in the direction close to the electromagnetic valve seat; the valve sleeve framework is a hollow structure; the valve needle seat 34 is clamped with the fixed iron core 33; the valve sleeve framework is used to connect the valve needle seat 34 and the electromagnetic valve seat 2; the valve needle seat 34 is provided with a first channel for hydraulic oil to pass through; the screw cap 1 is sleeved on the shell 36 and abuts against the flange 31; the shell 36 abuts against the flange 31; the valve core assembly 4 is arranged in the valve sleeve framework; the shell 36 is fixed on the valve sleeve framework by the screw 37; the valve sleeve framework is welded by the fixed iron core 33, the non-magnetic support 32 and the flange 31, which is both a coil framework and a magnetic circuit component; during the installation of the valve body 3, the enameled wire 35 is first wound on the valve sleeve framework, then the shell 36 is sleeved on the valve sleeve framework, at this time the enameled wire 35 is located between the valve sleeve framework and the shell 36, then the shell 36 is fixed on the fixed iron core 33 by the screw 37, then the valve needle seat 34 is inserted into the fixed iron core 33 in the valve sleeve framework, and the assembly of the valve body 3 is completed; since the enameled wire 35 in the device is directly wound on the valve sleeve framework, the valve sleeve framework is hollow and can be used as the moving area of the valve core assembly 4 and limit the moving position of the valve core assembly 4; compared with the traditional electromagnetic valve, the valve sleeve framework can also replace the effect of the iron core, thereby increasing the magnetic field strength of the electromagnetic field, and thus the iron core is not needed to be additionally added, thereby reducing the volume of the electromagnetic valve, so that it can be used in the petroleum sampling instrument, and the structure is compact, which can greatly shorten the length of the petroleum sampling instrument.

[0048] The electromagnetic valve valve seat 2 comprises a base 21, a needle seat 22 arranged on the base 21, a filter assembly arranged at an oil outlet end of the base 21, and an annular filter screen 25 sleeved at an oil inlet end of the base 21; the base 21 is provided with a groove for placing the needle seat 22, and a first communication hole 210 is further arranged between the groove and the filter assembly; the needle seat 22 is provided with a second channel 212 along an axial direction of the needle seat 22, and a third channel 213 communicated with the second channel 212, and the first communication hole 210 is communicated with the third channel 213; the valve core assembly 4 is located in the second channel 212 and has a preset gap with an inner wall of the second channel 212; the filter assembly comprises an electromagnetic valve filter screen 23 arranged at the oil outlet end of the base 21 and a clasp spring 24 for fixing the electromagnetic valve filter screen 23; during installation of the electromagnetic valve valve seat 2, the electromagnetic valve filter screen 23 can be installed on the base 21 through the clasp spring 24, then the needle seat 22 is placed in the groove on the base 21, one end of the valve core assembly 4 is inserted into the valve body 3, and the other end of the valve core assembly 4 is inserted into the needle seat 22, so that the installation of the electromagnetic valve valve seat 2 is completed; the enamel wire 35 is energized to generate a magnetic field, drive the valve core assembly 4 to move in the valve sleeve framework, and change the flow direction of the hydraulic oil in the electromagnetic valve; the first return spring 43 and the second return spring 46 in the assembled electromagnetic valve are in a compressed state.

[0049] The base 21 is further provided with a plurality of oil inlet channels for communicating the groove with an outer wall of the base 21, and a preset space is present between one end of the oil inlet channel away from the needle seat 22 and the annular filter screen 25; the inner wall of the groove is further provided with an annular flow guide groove for connecting the second communication hole 211 and one end of the oil inlet channel close to the needle seat 22.

[0050] The first sealing ring 38 is arranged between the valve needle seat 34 and the fixed iron core 33, the second sealing ring 39 is arranged between the flange 31 and the electromagnetic valve valve seat 2, the third sealing ring 26 and the fifth sealing ring 28 are sequentially sleeved on the base 21 in a direction away from the valve body 3, the fourth sealing ring 27 is arranged between the electromagnetic valve filter screen 23 and the base 21, and the sixth sealing ring 29 is arranged between the needle seat 22 and the inner wall of the groove; through the plurality of sealing rings, the sealing work can be performed, so that the hydraulic oil can flow in a predetermined area in the electromagnetic valve, thereby controlling the flow direction of the hydraulic oil.

[0051] As Figure 2 , Figure 3 , Figure 4 , Figure 7As shown, in the first embodiment, the valve core assembly 4 comprises a normally closed valve needle 42, a first reset spring 43 sleeved on the normally closed valve needle 42, and a first movable core 41 sleeved on the first reset spring 43; the normally closed valve needle 42 is provided with a plurality of first connecting ears 421, and there is a predetermined gap between adjacent first connecting ears 421; one end of the first reset spring 43 abuts against the first connecting ear 421, and the other end abuts against the valve needle seat 34; the first reset spring 43 is in a compressed state and applies a pushing force to the normally closed valve needle 42 through the first connecting ear 421, so that the normally closed valve needle 42 is displaced towards the needle seat 22, thereby blocking the third passage 213 on the needle seat 22, and a two-position three normally closed electromagnetic valve is formed; in the de-energized state of the two-position three normally closed electromagnetic valve, the compressed first reset spring 43 applies a spring force to the first connecting ear 421 in the direction of the needle seat 22, so that the first connecting ear 421 abuts against the first movable core 41; at this time, one end of the normally closed valve needle 42 abuts against the third passage 213 on the needle seat 22, thereby blocking the third passage 213; at this time, the hydraulic oil from the outside can enter the recess in the base 21 through the oil inlet passage from the annular filter screen 25, then enter the second passage 212 on the needle seat 22 along the second communication hole 211 on the needle seat 22, and then flow out of the electromagnetic valve along the first passage on the valve needle seat 34 between the normally closed valve needle 42 and the first movable core 41; when the enameled wire 35 is energized, a magnetic field is generated, which can attract the normally closed valve needle 42, so that the normally closed valve needle 42 moves towards the valve needle seat 34; in this process, the hydraulic oil can flow out of the first passage and the third passage 213; as the movement distance of the normally closed valve needle 42 increases, the normally closed valve needle 42 can block the first passage on the valve needle seat 34, so that the hydraulic oil can flow out of the third passage 213; then, when the enameled wire 35 is de-energized, the compressed first reset spring 43 can apply a spring force to the first connecting ear 421, the spring force being in the opposite direction to the deformation direction of the first reset spring 43, so that the first connecting ear 421 abuts against the first movable core 41, thereby blocking the third passage 213 on the needle seat 22.

[0052] As Figure 2 、 Figure 3 、 Figure 5 、 Figure 8As shown, in the second embodiment, the valve core assembly 4 comprises a normally open valve needle 48, a second reset spring 46 sleeved on the normally open valve needle 48, a second movable iron core 45 and a first static iron core 44 which are sequentially arranged on the normally open valve needle 48 and away from the valve body 3; wherein the normally open valve needle 48 is provided with a plurality of second connecting ears 47, there is a predetermined gap between adjacent second connecting ears 47, one end of the second reset spring 46 abuts against the second connecting ear 47, and the other end abuts against the first static iron core 44, the second reset spring 46 is in a compressed state, and applies a pushing force to the normally open valve needle 48 in the direction of the valve needle seat 34 through the second connecting ear 47, so that the normally open valve needle 48 is displaced in the direction of the valve needle seat 34 and blocks the first passage on the valve needle seat 34; the first static iron core 44 extends away from the valve body 3 at one end and forms an extension part in the direction away from the first static iron core 44, and the extension part abuts against the flange 31 and the needle seat 22 respectively; and the above structure further forms a two-position three normally open electromagnetic valve.

[0053] When the two-position three normally open electromagnetic valve is in a power-off state, the second reset spring 46 is compressed at this time, the compressed second reset spring 46 applies a spring force to the normally open valve needle 48 in the direction of the valve needle seat 34, at this time the second reset spring 46 pushes the normally open valve needle 48 to move in the direction of the valve needle seat 34, so that the normally open valve needle 48 abuts against the first passage on the valve needle seat 34, thereby enabling the hydraulic oil to flow out from the third passage 213; when the enameled wire 35 is powered, at this time the magnetic force generated by the coil formed by the enameled wire 35 is greater than the spring force of the second reset spring 46, so that the normally open valve needle 48 moves in the direction of the needle seat 22, thereby being able to block the third passage 213 and enable the hydraulic oil to flow out from the first passage.

[0054] As Figure 2 、 Figure 3 、 Figure 6 、 Figure 9As shown, in the third embodiment, the relevant parts in the second embodiment can be replaced, wherein the fixed core 33 in the second embodiment is replaced by a fixed core 310, the fixed core 310 is provided with a sealing groove, the sealing groove is a reverse U-shaped structure; the second movable iron core 45 can be replaced by a third movable iron core 49, the third movable iron core 49 is located in the sealing groove of the fixed core 310, and the third movable iron core 49 is provided with a sliding groove for the movement of the valve core assembly 4; through the above replacement, a two-position two-usual open electromagnetic valve is formed, in the power-off state, the second reset spring 46 is compressed, the compressed second reset spring 46 applies a spring force to the normally open valve needle 48 in the direction of the valve needle seat 34, so that one end of the normally open valve needle 48 can move in the sliding groove in the third movable iron core 49, at this time, the other end of the normally open valve needle 48 is away from the third passage 213 on the needle seat 22, so that the hydraulic oil can be discharged from the third passage 213, and in the power-on state, the magnetic force generated by the coil formed by the enameled wire 35 is greater than the elastic force of the second reset spring 46, so that one end of the normally open valve needle 48 is close to the needle seat 22, and one end of the normally open valve needle 48 abuts against the third passage 213 on the needle seat 22, thereby completing the plugging work of the third passage 213.

[0055] Working principle: in the installation process of the valve body 3, the enameled wire 35 is first wound on the valve sleeve framework, and then the shell 36 is sleeved on the valve sleeve framework, at this time the enameled wire 35 is located between the valve sleeve framework and the shell 36, then the shell 36 is fixed on the fixed core 33 through the screw 37, then the valve needle seat 34 is inserted into the fixed core 33 in the valve sleeve framework, thereby completing the assembly work of the valve body 3; in the installation work of the electromagnetic valve seat 2, the electromagnetic valve filter screen 23 can be installed on the base 21 through the set clasp spring 24, then the needle seat 22 is placed in the groove on the base 21, then one end of the valve core assembly 4 is inserted into the valve body 3, and then the other end of the valve core assembly 4 is inserted into the needle seat 22, thereby completing the installation work of the electromagnetic valve seat 2, then the valve body 3 can be installed on the electromagnetic valve seat 2 through the nut 1 sleeved on the valve body 3, through the plug-in installation mode, the operator can easily disassemble, install and maintain the valve body 3; then the device can form various electromagnetic valves according to the structure of the different valve core assemblies 4, which are respectively a two-position three-usual closed electromagnetic valve, a two-position three-usual open electromagnetic valve and a two-position two-usual open electromagnetic valve;

[0056] The working mode of the two-position three normally closed electromagnetic valve is that: when the power is off, the compressed first return spring 43 applies a spring force to the first connecting lug 421 in the direction of the needle seat 22, so that the first connecting lug 421 abuts against the first movable iron core 41, at this time, one end of the normally closed valve needle 42 abuts against the third passage 213 on the needle seat 22, thereby plugging the third passage 213, at this time, the hydraulic oil from the outside can enter the groove in the base 21 through the oil inlet passage, then the hydraulic oil enters the second passage 212 on the needle seat 22 through the second communication hole 211 on the needle seat 22, and then flows out of the electromagnetic valve through the first passage on the valve needle seat 34 between the normally closed valve needle 42 and the first movable iron core 41, when the enameled wire 35 is powered, at this time, a magnetic field is generated, which can attract the normally closed valve needle 42, so that the normally closed valve needle 42 moves towards the valve needle seat 34, in this process, the hydraulic oil can flow out of the first passage and the third passage 213, as the movement distance of the normally closed valve needle 42 increases, the normally closed valve needle 42 can plug the first passage on the valve needle seat 34, so that the hydraulic oil can flow out of the third passage 213, then when the enameled wire 35 is powered off, the compressed first return spring 43 can apply a spring force to the first connecting lug 421 in the opposite direction of the deformation direction of the first return spring 43, so that the first connecting lug 421 abuts against the first movable iron core 41, thereby plugging the third passage 213 on the needle seat 22;

[0057] The working mode of the two-position three normally closed electromagnetic valve is that: when the power is off, the compressed first return spring 43 applies a spring force to the first connecting lug 421 in the direction of the needle seat 22, so that the first connecting lug 421 abuts against the first movable iron core 41, at this time, one end of the normally closed valve needle 42 abuts against the third passage 213 on the needle seat 22, thereby plugging the third passage 213, at this time, the hydraulic oil from the outside can enter the groove in the base 21 through the oil inlet passage, then the hydraulic oil enters the second passage 212 on the needle seat 22 through the second communication hole 211 on the needle seat 22, and then flows out of the electromagnetic valve through the first passage on the valve needle seat 34 between the normally closed valve needle 42 and the first movable iron core 41, when the enameled wire 35 is powered, at this time, a magnetic field is generated, which can attract the normally closed valve needle 42, so that the normally closed valve needle 42 moves towards the valve needle seat 34, in this process, the hydraulic oil can flow out of the first passage and the third passage 213, as the movement distance of the normally closed valve needle 42 increases, the normally closed valve needle 42 can plug the first passage on the valve needle seat 34, so that the hydraulic oil can flow out of the third passage 213, then when the enameled wire 35 is powered off, the compressed first return spring 43 can apply a spring force to the first connecting lug 421 in the opposite direction of the deformation direction of the first return spring 43, so that the first connecting lug 421 abuts against the first movable iron core 41, thereby plugging the third passage 213 on the needle seat 22;

[0058] The working mode of the two-position three normally closed electromagnetic valve is that: when the power is off, the compressed first return spring 43 applies a spring force to the first connecting lug 421 in the direction of the needle seat 22, so that the first connecting lug 421 abuts against the first movable iron core 41, at this time, one end of the normally closed valve needle 42 abuts against the third passage 213 on the needle seat 22, thereby plugging the third passage 213, at this time, the hydraulic oil from the outside can enter the groove in the base 21 through the oil inlet passage, then the hydraulic oil enters the second passage 212 on the needle seat 22 through the second communication hole 211 on the needle seat 22, and then flows out of the electromagnetic valve through the first passage on the valve needle seat 34 between the normally closed valve needle 42 and the first movable iron core 41, when the enameled wire 35 is powered, at this time, a magnetic field is generated, which can attract the normally closed valve needle 42, so that the normally closed valve needle 42 moves towards the valve needle seat 34, in this process, the hydraulic oil can flow out of the first passage and the third passage 213, as the movement distance of the normally closed valve needle 42 increases, the normally closed valve needle 42 can plug the first passage on the valve needle seat 34, so that the hydraulic oil can flow out of the third passage 213, then when the enameled wire 35 is powered off, the compressed first return spring 43 can apply a spring force to the first connecting lug 421 in the opposite direction of the deformation direction of the first return spring 43, so that the first connecting lug 421 abuts against the first movable iron core 41, thereby plugging the third passage 213 on the needle seat 22;

[0059] The preferred embodiments of the present application are described in detail above with reference to the drawings, but the present application is not limited to the specific details of the above-described embodiments. Within the technical concept of the present application, various equivalent transformations of the technical solutions of the present application can be made, and these equivalent transformations all belong to the protection scope of the present application.

Claims

1. A solenoid valve for an oil sampling instrument, characterized in that, include: Valve body (3) and solenoid valve seat (2); Nut (1) is fitted onto valve body (3) to install valve body (3) onto solenoid valve seat (2) to form an integrated structure; The valve core assembly (4) is located inside the valve body (3) and is used to change the flow direction of hydraulic oil in the solenoid valve. By controlling the flow direction of hydraulic oil in the solenoid valve, the oil sampling instrument can measure the pressure at a predetermined position in the oil well according to the operator's operation. The valve body (3) includes an integrally formed valve sleeve skeleton, a housing (36) sleeved on the valve sleeve skeleton, a gap reserved between the inner wall of the housing (36) and the outer wall of the valve sleeve skeleton, an enameled wire (35) sleeved on the valve sleeve skeleton and located in the gap, and a valve needle seat (34) detachably connected to the valve sleeve skeleton. The valve sleeve frame includes a fixed iron core (33), a non-magnetic support (32), and a flange (31), which are arranged in sequence in the direction closest to the solenoid valve seat (2); The valve sleeve skeleton is a hollow structure, the valve needle seat (34) is snapped into the fixed iron core (33), and the valve sleeve skeleton is used to connect the valve needle seat (34) and the solenoid valve seat (2). The valve needle seat (34) has a first channel for hydraulic oil to pass through; The nut (1) is fitted onto the housing (36) and abuts against the flange (31), and the housing (36) abuts against the flange (31); The valve core assembly (4) is located inside the valve sleeve skeleton; The solenoid valve seat (2) includes a base (21), a needle seat (22) disposed on the base (21), a filter assembly disposed at the oil outlet end of the base (21), and an annular filter screen (25) sleeved at the oil inlet end of the base (21). The base (21) is provided with a groove for placing the needle seat (22), and a first connecting hole (210) is provided between the groove and the filter assembly. The needle holder (22) is provided with a second channel (212) along its axial direction and a third channel (213) communicating with the second channel (212), and the first connecting hole (210) is connected with the third channel (213); The valve core assembly (4) is located in the second channel (212) and has a preset gap with the inner wall of the second channel (212).

2. The solenoid valve for an oil sampling instrument according to claim 1, characterized in that: The base (21) is also provided with a plurality of oil inlet channels for connecting the groove and the outer wall of the base (21), and there is a preset space between one end of the oil inlet channel away from the needle seat (22) and the annular filter screen (25); The inner wall of the groove is also provided with an annular guide groove, which is used to connect the second connecting hole (211) and one end of the oil inlet channel near the needle seat (22).

3. The solenoid valve for an oil sampling instrument according to claim 2, characterized in that: The filter assembly includes a solenoid valve filter (23) located at the oil outlet of the base (21) and a retaining ring (24) for fixing the solenoid valve filter (23).

4. A solenoid valve for an oil sampling instrument according to claim 3, characterized in that: A first sealing ring (38) is provided between the valve needle seat (34) and the fixed iron core (33), a second sealing ring (39) is provided between the flange (31) and the solenoid valve seat (2), a third sealing ring (26) and a fifth sealing ring (28) are sequentially sleeved on the base (21) in the direction away from the valve body (3); a fourth sealing ring (27) is provided between the solenoid valve filter screen (23) and the base (21), and a sixth sealing ring (29) is provided between the needle seat (22) and the inner wall of the groove.

5. A solenoid valve for an oil sampling instrument according to claim 4, characterized in that: The valve core assembly (4) includes a normally closed valve needle (42), a first return spring (43) sleeved on the normally closed valve needle (42), and a first movable iron core (41) sleeved on the first return spring (43). The normally closed valve needle (42) is provided with a plurality of first connecting ears (421), and there is a predetermined gap between adjacent first connecting ears (421). One end of the first return spring (43) abuts against the first connecting ear (421), and the other end abuts against the valve needle seat (34). The first return spring (43) is in a compressed state and applies a thrust to the normally closed valve needle (42) through the first connecting ear (421), causing it to move toward the needle seat (22), thereby blocking the third channel (213) on the needle seat (22).

6. A solenoid valve for an oil sampling instrument according to claim 4, characterized in that: The valve core assembly (4) includes a normally open valve needle (48), a second return spring (46) sleeved on the normally open valve needle (48), and a second movable iron core (45) and a first stationary iron core (44) sleeved on the normally open valve needle (48) and arranged in sequence along the direction away from the valve body (3). The normally open valve needle (48) is provided with a plurality of second connecting ears (47), and there is a predetermined gap between adjacent second connecting ears (47). One end of the second return spring (46) abuts against the second connecting ear (47), and the other end abuts against the first stationary iron core (44). The second return spring (46) is in a compressed state and applies a thrust to the normally open valve needle (48) towards the valve needle seat (34) through the second connecting ear (47), causing the normally open valve needle (48) to move towards the valve needle seat (34) and block the first channel on the valve needle seat (34).

7. A solenoid valve for an oil sampling instrument according to claim 6, characterized in that: The first stationary iron core (44) extends away from the valve body (3) at one end, forming an extension portion, which abuts against the flange (31) and the needle seat (22) respectively.

8. A solenoid valve for an oil sampling instrument according to claim 7, characterized in that: The fixed iron core (33) can be replaced by a fixed core (310), and the fixed core (310) is provided with a sealing groove, which is an inverted U-shaped structure; The second movable iron core (45) can be replaced by a third movable iron core (49), which is located in a sealing groove opened on the fixed core (310) and has a sliding groove for the movement of the valve core assembly (4).

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