CN116498787A - Pilot-operated electromagnetic valve structure - Google Patents

Pilot-operated electromagnetic valve structure Download PDF

Info

Publication number
CN116498787A
CN116498787A CN202210072253.4A CN202210072253A CN116498787A CN 116498787 A CN116498787 A CN 116498787A CN 202210072253 A CN202210072253 A CN 202210072253A CN 116498787 A CN116498787 A CN 116498787A
Authority
CN
China
Prior art keywords
valve
armature
valve core
valve body
pressure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202210072253.4A
Other languages
Chinese (zh)
Inventor
张建明
姬广存
孙耀玮
冯琦
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wuxi Chengyu Information Technology Co ltd
Original Assignee
Wuxi Chengyu Information Technology Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wuxi Chengyu Information Technology Co ltd filed Critical Wuxi Chengyu Information Technology Co ltd
Priority to CN202210072253.4A priority Critical patent/CN116498787A/en
Publication of CN116498787A publication Critical patent/CN116498787A/en
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/32—Details
    • F16K1/34—Cutting-off parts, e.g. valve members, seats
    • F16K1/42—Valve seats
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/32—Details
    • F16K1/34—Cutting-off parts, e.g. valve members, seats
    • F16K1/46—Attachment of sealing rings
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Magnetically Actuated Valves (AREA)

Abstract

The invention discloses a pilot-operated electromagnetic valve structure which comprises a coil, a nozzle body, an armature spring, an armature, a valve body and a valve core. When the pilot electromagnetic valve is opened, the coil is electrified to generate a suction force, so that the armature moves upwards against the spring force of the armature spring, the sealing surface between the top of the valve core and the armature is opened, fluid flows to the low-pressure cavity through the pressure relief hole in the middle of the valve core, the pressure in the control cavity at the upper part of the valve core is reduced, the pressure in the high-pressure cavity at the lower part of the valve core is relatively higher, the valve core moves upwards under the action of pressure difference, the sealing surface between the bottom of the valve core and the valve body is opened, the high-pressure cavity is communicated with the low-pressure cavity, and the pilot electromagnetic valve is opened. When the pilot electromagnetic valve is closed, the coil outage attractive force disappears, the armature moves downwards under the action of the spring force of the armature spring, the sealing surface between the top of the valve core and the armature is closed, fluid flows to the control cavity through the air inlet hole on the side surface of the valve core, the pressure in the control cavity on the upper part of the valve core is increased, the pressure in the high-pressure cavity on the lower part of the valve core is relatively low, the valve core moves downwards under the action of pressure difference, the sealing surface between the bottom of the valve core and the valve body is closed, the high-pressure cavity is disconnected from the low-pressure cavity, and the pilot electromagnetic valve is closed. The invention simplifies the structure of the pilot electromagnetic valve.

Description

Pilot-operated electromagnetic valve structure
Technical Field
The invention relates to the field of electromagnetic valves, in particular to a pilot type electromagnetic valve structure.
Background
Normally closed solenoid valves used in high pressure hydraulic systems or pneumatic systems are often pilot solenoid valves in order to ensure the opening of the solenoid valve at high pressure, high flow rates.
The fields of the prior pilot electromagnetic valve application include new energy automobile fields, clean energy fields, fuel systems and the like, and the main defects of the prior pilot electromagnetic valve product include complex structure, small flow and low pressure resistance level.
Disclosure of Invention
In view of the above-described problems, an object of the present invention is to provide a pilot type solenoid valve structure having a simple structure, a large flow rate, and a high pressure-resistant level.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a pilot-operated electromagnetic valve structure comprises a coil, a nozzle body, an armature spring, an armature, a valve body and a valve core. When the pilot electromagnetic valve is opened, the coil is electrified to generate a suction force, so that the armature moves upwards against the spring force of the armature spring, the sealing surface between the top of the valve core and the armature is opened, fluid flows to the low-pressure cavity through the pressure relief hole in the middle of the valve core, the pressure in the control cavity at the upper part of the valve core is reduced, the pressure in the high-pressure cavity at the lower part of the valve core is relatively higher, the valve core moves upwards under the action of pressure difference, the sealing surface between the bottom of the valve core and the valve body is opened, the high-pressure cavity is communicated with the low-pressure cavity, and the pilot electromagnetic valve is opened. When the pilot electromagnetic valve is closed, the coil outage attractive force disappears, the armature moves downwards under the action of the spring force of the armature spring, the sealing surface between the top of the valve core and the armature is closed, fluid flows to the control cavity through the air inlet hole on the side surface of the valve core, the pressure in the control cavity on the upper part of the valve core is increased, the pressure in the high-pressure cavity on the lower part of the valve core is relatively low, the valve core moves downwards under the action of pressure difference, the sealing surface between the bottom of the valve core and the valve body is closed, the high-pressure cavity is disconnected from the low-pressure cavity, and the pilot electromagnetic valve is closed.
Preferably, in order to enhance electromagnetic force of the coil, there is a deformation structure including a nut, which is located at the top of the coil.
Preferably, in order to enhance electromagnetic force of the coil, there is a deformation structure of the nozzle body, so that the nozzle body is divided into three parts, namely a tight cap, a magnetism isolating sleeve and a base, wherein the tight cap and the base are made of magnetic conductive materials, and the magnetism isolating sleeve is made of non-magnetic conductive materials.
Preferably, in order to enhance the electromagnetic force of the coil, there is a deformation structure of the nozzle body and the armature, so that the bottom of the inner hole of the nozzle body and the top of the armature are matched conical surfaces.
Preferably, in order to enhance the electromagnetic force of the coil, there is a deformed structure of the tightening cap and the armature, so that the bottom of the tightening cap and the top of the armature are matched conical surfaces.
Preferably, in order to enhance the sealing performance of the sealing surface between the top of the valve core and the armature, there are two deformation structures of the valve core sealing gasket containing high polymer materials, wherein the valve core sealing gasket of one structure is installed at the bottom of the armature, and the valve core sealing gasket of the other structure is installed at the top of the valve core.
Preferably, in order to enhance the sealing performance of the sealing surface between the bottom of the valve core and the valve body, there are two deformation structures of the valve body sealing gasket containing high polymer materials, wherein the valve body sealing gasket of one structure is installed at the bottom of the valve core, and the valve body sealing gasket of the other structure is installed at the bottom of the inner hole of the valve body.
Preferably, for convenience in mounting a valve body sealing gasket, there is a deformation structure including a valve seat mounted on the valve body, the valve body sealing gasket being mounted between the valve body and the valve seat.
Preferably, in order to allow fluid to flow into the control chamber only from the air inlet hole on the side of the valve core when the pilot-operated solenoid valve is opened, but not from the movement gap between the valve core and the valve body, thereby improving the opening stability of the pilot-operated solenoid valve, there are two deformed structures including a sealing ring, wherein the sealing ring of one structure is installed in the groove of the valve core, and the sealing ring of the other structure is installed in the groove of the valve body.
Preferably, in order to increase the opening response speed of the pilot-operated solenoid valve, there is a modified structure including a spool spring mounted between the spool and the valve body.
Preferably, in order to facilitate adjustment of the lift of the armature, there is a deformation structure including an adjustment shim mounted between the nozzle body and the valve body.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention, are incorporated in and constitute a part of this specification. The drawings and their description are illustrative of the invention and are not to be construed as unduly limiting the invention. In the drawings:
FIG. 1 is a schematic diagram of a pilot operated solenoid valve according to an embodiment of the present invention;
FIG. 2 is a schematic view of a modified structure including a nut according to an embodiment of the present invention;
FIG. 3 is a schematic view showing a modified structure of a nozzle body according to an embodiment of the present invention;
FIG. 4 is a schematic illustration of a variation of a nozzle body and armature in accordance with an embodiment of the invention;
fig. 5 is a schematic view of a deformed structure of a tightening cap and an armature according to an embodiment of the present invention;
FIG. 6 is a schematic view of a deformed structure of a valve core sealing gasket mounted on the bottom of an armature according to an embodiment of the invention;
FIG. 7 is a schematic diagram of a deformed structure of a valve core sealing gasket of the valve core installed on the top of the valve core according to an embodiment of the present invention;
FIG. 8 is a schematic view of a bottom deformation structure of a valve body gasket installed on a valve core according to an embodiment of the present invention;
FIG. 9 is a schematic view of a bottom deformation structure of a valve body gasket installed in an inner bore of a valve body according to an embodiment of the present invention;
FIG. 10 is a schematic illustration of a deformed configuration including a valve seat in accordance with an embodiment of the present invention;
FIG. 11 is a schematic view of a deformed structure in which a seal ring is installed in a groove of a valve element according to an embodiment of the present invention;
FIG. 12 is a schematic view showing a modified structure in which a seal ring is installed in a groove of a valve body according to an embodiment of the present invention;
FIG. 13 is a schematic illustration of a deformed configuration including a spool spring according to an embodiment of the present invention;
FIG. 14 is a schematic view of a modified structure including an adjustment shim according to an embodiment of the present invention;
reference numerals meaning: 01 coil, 02 nozzle body, 03 armature spring, 04 armature, 05 valve body, 06 valve core, 07 pressure release hole, 08 low pressure cavity, 09 control cavity, 10 high pressure cavity, 11 inlet port, 12 nut, 13 tight cap, 14 magnetism isolating sleeve, 15 base, 16 valve core sealing gasket, 17 valve body sealing gasket, 18 valve seat, 19 sealing washer, 20 valve core spring, 21 adjustment gasket.
Detailed Description
The invention aims to provide a pilot-operated electromagnetic valve structure which can be used in the field of hydrogen energy and natural gas.
In order to better understand the solution of the present invention, the technical solution of the embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiment of the present invention. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention.
It should be noted that the terms "first," "second," and the like herein are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe the embodiments of the invention herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In the present invention, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate an azimuth or a positional relationship based on that shown in the drawings. These terms are only used to better describe the present invention and its embodiments and are not intended to limit the scope of the indicated devices, elements or components to the particular orientations or to configure and operate in the particular orientations.
Furthermore, the terms "mounted," "configured," "provided," "connected," "coupled," and "sleeved" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; may be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements, or components. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
As shown in fig. 1, a pilot-operated solenoid valve structure includes a 01 coil, a 02 nozzle body, a 03 armature spring, a 04 armature, a 05 valve body, and a 06 valve core. When the pilot electromagnetic valve is opened, a 01 coil is electrified to generate a suction force, so that a 04 armature moves upwards against the spring force of a 03 armature spring, a sealing surface between the top of a 06 valve core and the 04 armature is opened, fluid flows to a 08 low-pressure cavity through a 07 pressure relief hole in the middle of the 06 valve core, the pressure in a 09 control cavity at the upper part of the 06 valve core is reduced, the pressure in a 10 high-pressure cavity at the lower part of the 06 valve core is relatively higher, the 06 valve core moves upwards under the action of pressure difference, the sealing surface between the bottom of the 06 valve core and a 05 valve body is opened, the 10 high-pressure cavity is communicated with the 08 low-pressure cavity, and the pilot electromagnetic valve is opened. When the pilot electromagnetic valve is closed, the power-off suction force of the 01 coil disappears, the 04 armature moves downwards under the action of the spring force of the 03 armature spring, the sealing surface between the top of the 06 valve core and the 04 armature is closed, fluid flows to the 09 control cavity through the 11 air inlet hole on the side surface of the 06 valve core, the pressure in the 09 control cavity on the upper part of the 06 valve core is increased, the pressure in the 10 high-pressure cavity on the lower part of the 06 valve core is relatively lower, the 06 valve core moves downwards under the action of pressure difference, the sealing surface between the bottom of the 06 valve core and the 05 valve body is closed, the 10 high-pressure cavity is disconnected from the 08 low-pressure cavity, and the pilot electromagnetic valve is closed.
As shown in fig. 2, in order to enhance the electromagnetic force of the 01 coil, there is a modified structure including a 12 nut, the 12 nut being located on top of the 01 coil.
As shown in fig. 3, in order to enhance the electromagnetic force of the 01 coil, there is a deformation structure of the nozzle body, so that the nozzle body is divided into three parts, namely a 13 tight cap, a 14 magnetism isolating sleeve and a 15 base, wherein the 13 tight cap and the 15 base are made of magnetic conductive materials, and the 14 magnetism isolating sleeve is made of non-magnetic conductive materials.
As shown in fig. 4, in order to enhance the electromagnetic force of the 01 coil, there is a deformation structure of the 02 nozzle body and the 04 iron, so that the bottom of the inner hole of the 02 nozzle body and the top of the 04 armature are matched conical surfaces.
As shown in fig. 5, in order to enhance the electromagnetic force of the 01 coil, there is a deformation structure of the 13 tight cap and the 04 armature, so that the bottom of the 13 tight cap and the top of the 04 armature are matched conical surfaces.
As shown in fig. 6 and 7, in order to enhance the sealing performance of the sealing surface between the top of the 06 valve core and the 04 armature, there are two kinds of deformed structures of 16 valve core sealing gaskets containing high polymer materials, one structure of 16 valve core sealing gaskets is installed at the bottom of the 04 armature, and the other structure of 16 valve core sealing gaskets is installed at the top of the 06 valve core.
As shown in fig. 8 and 9, in order to enhance the sealing performance of the sealing surface between the bottom of the 06 valve core and the 05 valve body, there are two kinds of deformation structures of the 17 valve body sealing gasket containing high polymer materials, one 17 valve body sealing gasket of the structure is installed at the bottom of the 06 valve core, and the other 17 valve body sealing gasket of the structure is installed at the bottom of the inner hole of the 05 valve body.
As shown in fig. 10, for convenience of installation of the 17-valve-body sealing gasket, there is a modified structure including an 18-valve seat, the 18-valve seat being installed on the 05-valve body, and the 17-valve-body sealing gasket being installed between the 05-valve body and the 18-valve seat.
As shown in fig. 11 and 12, in order to allow fluid to flow into the 09 control chamber only from the 11 air inlet hole on the side of the 06 spool when the pilot solenoid valve is opened, but not from the movement gap between the 06 spool and the 05 valve body, thereby improving the stability of the opening of the pilot solenoid valve, there are two modified structures including 19 sealing rings, one structure of which is installed in the groove of the 06 spool and the other structure of which is installed in the groove of the 05 valve body.
As shown in fig. 13, in order to increase the opening response speed of the pilot type solenoid valve, there is a modified structure including a 20 spool spring, the 20 spool spring being installed between a 06 spool and a 05 valve body.
As shown in fig. 14, in order to facilitate adjustment of the lift of the 04 armature, there is a modified structure including a 21 adjustment shim mounted between the 02 nozzle body and the 05 valve body.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. The invention is not limited to be applied to the technical field of electromagnetic valves, but also comprises other technical fields requiring the application of control valve products. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (11)

1. The utility model provides a guide formula solenoid valve structure, includes coil, nozzle body, armature spring, armature, valve body and case, the coil is installed on the nozzle body, the armature is installed in the nozzle body, the armature spring is installed the nozzle body with between the armature, the valve body is installed on the nozzle body, the case is installed in the valve body.
2. A pilot operated solenoid valve structure as set forth in claim 1 wherein there is a deformed structure including a nut located on top of said coil.
3. The pilot-operated solenoid valve structure of claim 1 wherein there is a deformation of the nozzle body that divides the nozzle body into three parts, a tight cap, a magnetically isolated sleeve and a base, the tight cap and base being magnetically permeable material and the magnetically isolated sleeve being magnetically non-permeable material.
4. A pilot operated solenoid valve structure as set forth in claim 1 wherein there is a deforming structure of the nozzle body and armature such that the bottom of the bore in the nozzle body and the top of the armature are mating conical surfaces.
5. A pilot operated solenoid valve structure as set forth in claim 3 wherein there is a deformed configuration of the cap and armature such that the bottom of the cap and the top of the armature are mating conical surfaces.
6. The pilot operated solenoid valve structure of claim 1 wherein there are two deformed structures of spool sealing gaskets comprising polymeric material, one of the spool sealing gaskets of one structure being mounted on the bottom of the armature and the other spool sealing gasket of the other structure being mounted on the top of the spool.
7. A pilot operated solenoid valve structure as set forth in claim 1 wherein there are two deformed structures of valve body sealing gaskets comprising polymeric material, one of said valve body sealing gaskets being mounted on the bottom of said valve spool and the other of said valve body sealing gaskets being mounted on the bottom of said valve body bore.
8. A pilot operated solenoid valve structure as set forth in claim 7 wherein there is a deformed structure including a valve seat mounted on said valve body, said valve body sealing gasket being mounted between said valve body and said valve seat.
9. A pilot operated solenoid valve structure as set forth in claim 1 wherein there are two deformed structures including a sealing ring, one of said sealing rings being mounted in a recess in said valve body and the other of said sealing rings being mounted in a recess in said valve body.
10. A pilot operated solenoid valve structure as set forth in claim 1 wherein there is a deformed structure comprising a spool spring mounted between said spool and valve body.
11. A pilot operated solenoid valve structure as set forth in claim 1 wherein there is a deformation structure including a trim washer mounted between said nozzle body and said valve body.
CN202210072253.4A 2022-01-21 2022-01-21 Pilot-operated electromagnetic valve structure Pending CN116498787A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210072253.4A CN116498787A (en) 2022-01-21 2022-01-21 Pilot-operated electromagnetic valve structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210072253.4A CN116498787A (en) 2022-01-21 2022-01-21 Pilot-operated electromagnetic valve structure

Publications (1)

Publication Number Publication Date
CN116498787A true CN116498787A (en) 2023-07-28

Family

ID=87329062

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210072253.4A Pending CN116498787A (en) 2022-01-21 2022-01-21 Pilot-operated electromagnetic valve structure

Country Status (1)

Country Link
CN (1) CN116498787A (en)

Similar Documents

Publication Publication Date Title
US4988074A (en) Proportional variable force solenoid control valve
CN101772666A (en) Solenoid valve
CN201496572U (en) Magnetic-keeping electromagnetic valve
CN112413136A (en) Proportional flow valve
CN103939655A (en) High-frequency on-off valve
CN116498787A (en) Pilot-operated electromagnetic valve structure
CN216951913U (en) Pilot-operated type electromagnetic valve structure
CN208364852U (en) A kind of two-bit triplet solenoid valve
CN103375453A (en) Light fast-response electromagnetic valve
CN111059303A (en) Cone sealing structure and electromagnetic pilot control air valve
CN215928391U (en) Novel electromagnetic valve structure
CN117090984A (en) Switch valve with compact structure
CN218094537U (en) Switch valve with compact structure
CN217207983U (en) Plug-in type switch valve structure
CN106704615B (en) Novel inserting plate type electromagnetic valve
CN213899897U (en) Proportional flow valve
CN115707891A (en) Novel electromagnetic valve structure
CN116624639A (en) Plug-in type switch valve structure
GB2352495A (en) Pressure balanced flow control valve
CN114458769A (en) Quick response's guide's formula solenoid valve structure
CN218718807U (en) Electromagnetic valve
CN106958683B (en) Two-position two-way high-low pressure all-purpose valve
CN219300039U (en) Normally open electromagnetic valve
CN204437421U (en) A kind of oilling machine flow proportion valve
CN216343576U (en) Normally open solenoid valve for automobile braking system

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination