CN112253434A - Hydraulic end conveying device of hydrochloric acid corrosion resistant diaphragm pump - Google Patents

Hydraulic end conveying device of hydrochloric acid corrosion resistant diaphragm pump Download PDF

Info

Publication number
CN112253434A
CN112253434A CN202011332565.1A CN202011332565A CN112253434A CN 112253434 A CN112253434 A CN 112253434A CN 202011332565 A CN202011332565 A CN 202011332565A CN 112253434 A CN112253434 A CN 112253434A
Authority
CN
China
Prior art keywords
rubber
diaphragm
overflowing
buffer
seat
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
CN202011332565.1A
Other languages
Chinese (zh)
Inventor
齐东杰
王连丹
李文明
张恩龙
张立华
王志旺
韩晓冬
石晶存
赵耜荒
陈扬
吴铁奎
王占勇
戴启鹏
孙丹龙
张国峰
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.)
CNMC Shenyang Pump Co Ltd
Original Assignee
CNMC Shenyang Pump 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 CNMC Shenyang Pump Co Ltd filed Critical CNMC Shenyang Pump Co Ltd
Priority to CN202011332565.1A priority Critical patent/CN112253434A/en
Publication of CN112253434A publication Critical patent/CN112253434A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/02—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms
    • F04B43/06—Pumps having fluid drive
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/0009—Special features
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/0009—Special features
    • F04B43/0081—Special features systems, control, safety measures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/10—Valves; Arrangement of valves
    • F04B53/1002—Ball valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)

Abstract

The utility model provides a hydrochloric acid corrosion resistant diaphragm pump fluid end conveyor belongs to diaphragm pump technical field, concretely relates to hydrochloric acid corrosion resistant diaphragm pump fluid end conveyor. The invention provides a diaphragm pump hydraulic end conveying device which is low in cost and can stably work for a long time in a hydrochloric acid corrosion environment. The invention comprises a feeding flow buffer device, a feeding pipe, a one-way valve, a diaphragm chamber, a discharging pipe and a discharging buffer device which are connected in sequence, wherein the diaphragm chamber is connected with a piston cylinder, and the invention is characterized in that: soft rubber is arranged on the inner surfaces of the feeding flow buffer device, the feeding pipe and the discharging pipe; the check valve comprises a valve box lined with soft rubber, an overflowing seat communicated with the feeding pipe is arranged at the lower end in the valve box, buffer rubber is arranged above the overflowing seat, a guide frame is arranged above the buffer rubber, a valve ball corresponding to the buffer rubber and the overflowing seat is arranged in the guide frame, and a limiting cover of the valve ball is arranged at the upper end of the valve box.

Description

Hydraulic end conveying device of hydrochloric acid corrosion resistant diaphragm pump
Technical Field
The invention belongs to the technical field of diaphragm pumps, and particularly relates to a hydraulic end conveying device of a hydrochloric acid corrosion resistant diaphragm pump.
Background
The diaphragm pump is used as functional equipment for conveying slurry, a liquid end device of the diaphragm pump is contacted with a solid-liquid two-phase medium, the pressure bearing and wear resistance of the conventional liquid end device are mainly considered, but for the diaphragm pump for conveying a medium containing hydrochloric acid, the corrosion resistance of the diaphragm pump, especially the slurry containing hydrochloric acid, needs to be considered besides the pressure bearing and wear resistance. The conventional metal material or stainless steel material can not meet the requirement of hydrochloric acid corrosion resistance, and the metal material capable of meeting the hydrochloric acid corrosion resistance can only be used in a laboratory due to high price and is not suitable for being applied to large-scale equipment. The non-metallic material can meet the requirements of hydrochloric acid corrosion resistance, but the strength performance is poor, and the mechanical performance requirements of the diaphragm pump cannot be met. For example, rubber, polytetrafluoroethylene and the like can not meet the pressure bearing requirement of a process system when used alone, and ceramic products can not be applied to a diaphragm pump structure due to large processing difficulty and impact resistance. Therefore, no diaphragm pump hydraulic end conveying device capable of resisting hydrochloric acid corrosion exists in the market.
Disclosure of Invention
The invention aims at the problems and provides the diaphragm pump hydraulic end conveying device which is low in cost and can stably work for a long time in a hydrochloric acid corrosion environment.
In order to achieve the purpose, the invention adopts the following technical scheme that the device comprises a feeding flow buffer device, a feeding pipe, a one-way valve, a diaphragm chamber, a discharging pipe and a discharging buffer device which are sequentially connected, wherein the diaphragm chamber is connected with a piston cylinder, and the device is characterized in that: soft rubber is arranged on the inner surfaces of the feeding flow buffer device, the feeding pipe and the discharging pipe; the check valve comprises a valve box lined with soft rubber, an overflowing seat communicated with a feeding pipe is arranged at the lower end in the valve box, buffer rubber is arranged above the overflowing seat, a guide frame is arranged above the buffer rubber, a valve ball corresponding to the buffer rubber and the overflowing seat is arranged in the guide frame, and a limiting cover of the valve ball is arranged at the upper end of the valve box; the overflowing seat, the guide frame and the limiting cover are made of polytetrafluoroethylene materials, and the valve ball is a ceramic valve ball or a rubber-lined valve ball; the diaphragm chamber is matched with the diaphragm cover, a diaphragm body is arranged between the diaphragm chamber and the diaphragm cover, hard rubber is arranged on the surface of the matching part of the diaphragm chamber and the diaphragm cover, and soft rubber is arranged in the overflowing area of the diaphragm chamber and the diaphragm cover; the diaphragm body is made of fluororubber; the discharging buffer device comprises an upper shell, a lower shell and a bowl-shaped air bag, hard rubber is arranged on the surface of the matched part of the upper shell and the lower shell, and soft rubber is arranged at the contact part of the upper shell and the lower shell and the slurry; the bowl-shaped air bag is made of fluororubber.
As a preferred scheme of the invention, the matching part of the diaphragm cover and the diaphragm chamber is arranged into a step structure, and the hard rubber is coated outside the step structure; the soft rubber in the diaphragm chamber and the diaphragm cover flow area is bent at the corner and is in lap joint with the hard rubber.
As another preferred scheme of the invention, the assembly position of the upper shell and the lower shell of the discharging buffer device is arranged in a step shape, and the hard rubber is coated outside the step structure of the lower shell; the soft rubber on the inner surface of the lower shell is bent at a corner and is in lap joint with the hard rubber.
The invention has the beneficial effects that:
the soft rubber is arranged at the position where the soft rubber is contacted with the slurry, and meanwhile, the hard rubber is adopted at the assembling position, so that the problem of difficult processing of the soft rubber is solved. The soft rubber and the hard rubber which are mutually overlapped form good connection, so that the metal shell is prevented from being corroded, the service life of the connection part can be ensured, and the processing is easy.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic view of the structure of the check valve.
FIG. 3 is a schematic view of the structure of the diaphragm chamber.
Fig. 4 is an enlarged view of a portion a of fig. 3.
Fig. 5 is an enlarged view of a portion B of fig. 3.
Fig. 6 is a schematic structural view of the discharging buffer device.
Fig. 7 is an enlarged view of the portion C of fig. 6.
In the attached drawing, 1 is a feeding flow buffer device, 2 is a feeding pipe, 3 is a one-way valve, 4 is a diaphragm chamber, 5 is a discharging pipe, 6 is a discharging buffer device, 7 is a piston cylinder, 8 is soft rubber, 9 is hard rubber, 10 is a disintegration structure, 21 is a valve box, 22 is a compression ring, 23 is an overflowing seat, 24 is buffer rubber, 25 is a lower mounting groove, 26 is an upper mounting groove, 27 is a valve ball, 28 is a compression body, 29 is a guide frame, 210 is a limit cover, 41 is a diaphragm cover, 42 is a diaphragm body, 61 is a bowl-shaped air bag, 62 is a lower shell, and 63 is an upper shell.
Detailed Description
The invention comprises a feeding flow buffer device 1, a feeding pipe 2, a one-way valve 3, a diaphragm chamber 4, a discharging pipe 5 and a discharging buffer device 6 which are connected in sequence, wherein the diaphragm chamber 4 is connected with a piston cylinder 7, and the invention is characterized in that: soft rubber 8 is arranged on the inner surfaces of the feeding flow buffer device 1, the feeding pipe 2 and the discharging pipe 5; the check valve 3 comprises a valve box 21 lined with soft rubber 8, a flow passing seat 23 communicated with the feeding pipe 2 is arranged at the lower end in the valve box 21, buffer rubber 24 is arranged above the flow passing seat 23, a guide frame 29 is arranged above the buffer rubber 24, a valve ball 27 corresponding to the buffer rubber 24 and the flow passing seat 23 is arranged in the guide frame 29, and a limiting cover 210 of the valve ball 27 is arranged at the upper end of the valve box 21; the overflowing seat 23, the guide frame 29 and the limiting cover 210 are made of polytetrafluoroethylene materials, and the valve ball 27 is a ceramic valve ball 27 or a rubber-lined valve ball 27; the diaphragm chamber 4 is matched with the diaphragm cover 41, a diaphragm body 42 is arranged between the diaphragm chamber 4 and the diaphragm cover 41, hard rubber 9 is arranged on the surface of the matching part of the diaphragm chamber 4 and the diaphragm cover 41, and soft rubber 8 is arranged in the overflowing area of the diaphragm chamber 4 and the diaphragm cover 41; the diaphragm body is made of fluororubber; the discharging buffer device 6 comprises an upper shell 63, a lower shell 62 and a bowl-shaped air bag 61, hard rubber 9 is arranged on the surface of the matched part of the upper shell 63 and the lower shell 62, and soft rubber 8 is arranged at the contact part of the upper shell 63 and the lower shell 62 and the slurry; the bowl-shaped bladder 61 is made of fluororubber.
A lower mounting groove 25 with an inner high outsole is arranged above the overflowing seat 23, the shape of the buffer rubber 24 corresponds to that of the lower mounting groove 25, an upper mounting groove 26 with an inner high outsole is arranged above the buffer rubber 24, a mounting seat at the lower end of the guide frame 29 is arranged in the upper mounting groove 26, a gap is arranged between a guide part at the upper end of the guide frame 29 and the inner surface of the valve box 21, and the inner diameter of the guide part is larger than the outer diameter of the valve ball 27; a pressing body 28 is arranged in the valve box 21 corresponding to the mounting seat of the guide frame 29; the guide frame 29, the cushion rubber 24 and the overflow seat 23 are fixed in the valve box 21 through the clamp ring 22 and the clamp body 28.
As a preferable scheme of the present invention, a matching portion of the diaphragm cover 41 and the diaphragm chamber 4 is provided with a stepped structure, and the hard rubber 9 is coated outside the stepped structure; the diaphragm chamber 4 and the soft rubber 8 in the overflowing area of the diaphragm cover 41 are bent at the corners and are mutually lapped with the hard rubber 9.
As another preferable scheme of the present invention, the assembly position of the upper housing 63 and the lower housing 62 of the discharging buffer device 6 is provided with a step shape, and the hard rubber 9 is coated outside the step structure of the lower housing 62; the inner surface of the upper shell 63 is provided with soft rubber 8, and the soft rubber 8 on the inner surface of the lower shell 62 is bent at a corner and is mutually lapped with the hard rubber 9.
Example (b): the feed flow buffering means 1, acting as slurry supply compensation and diversion means, needs to be in contact with the slurry. Carbon steel is selected as the pressure-bearing shell material, and the inner part of the shell material is lined with wear-resistant soft rubber 8. The device can be designed into a structure with an upper part and a lower part and with a gland, rubber linings can be respectively implemented, and the problem of difficult lining construction is solved.
The feeding pipe 2 and the discharging pipe 5 are used as a feeding channel and a discharging channel, carbon steel is selected as a pipe body material, the lining is made of soft rubber 8, the feeding pipe 2 is guaranteed to play a role of a slurry flow passage, the shell has the characteristic of high pressure bearing, and the lining has the characteristics of abrasion resistance and corrosion resistance.
The valve box 21 of the one-way valve 3 is made of alloy steel materials, the inner lining rubber is soft and is combined with hard rubber 9, the part in contact with the slurry is made of soft rubber 8, and the part with the assembly and processing requirements is made of hard rubber 9. The overflowing seat 23, the guide frame 29 and the limiting cover 210 are in contact with the slurry, but belong to non-pressure-bearing parts, and are not suitable for rubber lining corrosion prevention due to the complex structural shape and compact space. Therefore, the polytetrafluoroethylene product is selected for processing and forming. The ceramic valve ball 27 is in contact with the valve rubber and needs to be sealed, so the rubber-lined valve ball 27 or the ceramic valve ball 27 is selected.
The shell of the diaphragm cover of the diaphragm chamber 4 is made of alloy steel material, and the inner lining rubber is soft and is combined with the hard rubber 9. The overflowing area and the processing assembly area are designed into a step form, the problem that the processing difficulty of the soft rubber 8 is high is solved, the soft rubber 8 is adopted at the part in contact with the slurry, and the hard rubber 9 is adopted at the part with the processing requirement and the assembly part. The diaphragm is made of fluororubber material with excellent hydrochloric acid resistance. The diaphragm pump isolates the slurry from the hydraulic oil through the diaphragm, and the diaphragm is not in contact with the slurry under the condition that the diaphragm is not damaged, so that the surface of the inner cavity at the rear side of the diaphragm can be subjected to anti-corrosion coating or is not subjected to anti-corrosion treatment.
The discharging buffer device 6 is designed into a split structure, so that the problem of difficult corrosion resistance in the buffer device can be solved; the air bag is made of fluororubber material with excellent hydrochloric acid resistance, soft hydrochloric acid corrosion-resistant and wear-resistant rubber is lined at the contact part of the inner cavities of the upper and lower shells 62 and slurry, hard processable rubber is lined in a processing and matching area, and a processing and non-processing area is designed into a step shape, so that the processability is improved, and the double effects of assembly and corrosion resistance can be realized.
The piston cylinder 7 is not in direct contact with the slurry, so only the inner surface of the piston cylinder 7 is subjected to anticorrosion coating treatment.
It should be understood that the detailed description of the present invention is only for illustrating the present invention and is not limited by the technical solutions described in the embodiments of the present invention, and those skilled in the art should understand that the present invention can be modified or substituted equally to achieve the same technical effects; as long as the use requirements are met, the method is within the protection scope of the invention.

Claims (4)

1. The utility model provides a hydrochloric acid corrosion resistant diaphragm pump fluid end conveyor, includes feeding flow buffer (1), inlet pipe (2), check valve (3), diaphragm chamber (4), discharging pipe (5) and ejection of compact buffer (6) that connect gradually, and diaphragm chamber (4) link to each other its characterized in that with piston cylinder (7): soft rubber (8) is arranged on the inner surfaces of the feeding flow buffer device (1), the feeding pipe (2) and the discharging pipe (5); the check valve (3) comprises a valve box (21) lined with soft rubber (8), an overflowing seat (23) communicated with the feeding pipe (2) is arranged at the lower end in the valve box (21), buffer rubber (24) is arranged above the overflowing seat (23), a guide frame (29) is arranged above the buffer rubber (24), a valve ball (27) corresponding to the buffer rubber (24) and the overflowing seat (23) is arranged in the guide frame (29), and a limiting cover (210) of the valve ball (27) is arranged at the upper end of the valve box (21); the overflowing seat (23), the guide frame (29) and the limiting cover (210) are made of polytetrafluoroethylene materials, and the valve ball (27) is a ceramic valve ball (27) or a rubber-lined valve ball (27); the diaphragm chamber (4) is matched with the diaphragm cover (41), a diaphragm body (42) is arranged between the diaphragm chamber (4) and the diaphragm cover (41), hard rubber (9) is arranged on the surface of the matching part of the diaphragm chamber (4) and the diaphragm cover (41), and soft rubber (8) is arranged in the overflowing area of the diaphragm chamber (4) and the diaphragm cover (41); the diaphragm body is made of fluororubber; the discharging buffer device (6) comprises an upper shell (63), a lower shell (62) and a bowl-shaped air bag (61), hard rubber (9) is arranged on the surface of the matched part of the upper shell (63) and the lower shell (62), and soft rubber (8) is arranged at the contact part of the upper shell (63) and the lower shell (62) and the slurry; the bowl-shaped air bag (61) is made of fluororubber.
2. The hydraulic end conveying device of a hydrochloric acid corrosion resistant diaphragm pump according to claim 1, characterized in that: a lower mounting groove (25) with an inner high outsole is formed above the overflowing seat (23), the shape of the buffer rubber (24) corresponds to that of the lower mounting groove (25), an upper mounting groove (26) with an inner high outsole is formed above the buffer rubber (24), a mounting seat at the lower end of the guide frame (29) is arranged in the upper mounting groove (26), a gap is formed between a guide part at the upper end of the guide frame (29) and the inner surface of the valve box (21), and the inner diameter of the guide part is larger than the outer diameter of the valve ball (27); a pressing body (28) is arranged in the valve box (21) corresponding to the mounting seat of the guide frame (29); the guide frame (29), the buffer rubber (24) and the overflowing seat (23) are fixed in the valve box (21) through a compression ring (22) and a compression body (28).
3. The hydraulic end conveying device of a hydrochloric acid corrosion resistant diaphragm pump according to claim 1, characterized in that: the matching part of the diaphragm cover (41) and the diaphragm chamber (4) is arranged to be of a ladder structure, and the hard rubber (9) is coated outside the ladder structure; the diaphragm chamber (4) and the soft rubber (8) in the overflowing area of the diaphragm cover (41) are bent at the corners and are mutually overlapped with the hard rubber (9).
4. The hydraulic end conveying device of a hydrochloric acid corrosion resistant diaphragm pump according to claim 1, characterized in that: the assembly position of an upper shell (63) and a lower shell (62) of the discharging buffer device (6) is arranged in a step shape, and the hard rubber (9) is coated outside the step structure of the lower shell (62); the inner surface of the upper shell (63) is provided with soft rubber (8), and the soft rubber (8) on the inner surface of the lower shell (62) is bent at a corner and is mutually lapped with the hard rubber (9).
CN202011332565.1A 2020-11-24 2020-11-24 Hydraulic end conveying device of hydrochloric acid corrosion resistant diaphragm pump Pending CN112253434A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011332565.1A CN112253434A (en) 2020-11-24 2020-11-24 Hydraulic end conveying device of hydrochloric acid corrosion resistant diaphragm pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011332565.1A CN112253434A (en) 2020-11-24 2020-11-24 Hydraulic end conveying device of hydrochloric acid corrosion resistant diaphragm pump

Publications (1)

Publication Number Publication Date
CN112253434A true CN112253434A (en) 2021-01-22

Family

ID=74225668

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011332565.1A Pending CN112253434A (en) 2020-11-24 2020-11-24 Hydraulic end conveying device of hydrochloric acid corrosion resistant diaphragm pump

Country Status (1)

Country Link
CN (1) CN112253434A (en)

Similar Documents

Publication Publication Date Title
CN211500955U (en) Stainless steel valve box with packing sleeve structure
CN210004007U (en) kinds of corrosion-resistant and impact-resistant elbow pipe
CN201903371U (en) Electromagnetic flowmeter sensor with composite liner
CN211259942U (en) Multistage self-tightening metal sealing structure
CN214196617U (en) Hydraulic end conveying device of hydrochloric acid corrosion resistant diaphragm pump
CN112253434A (en) Hydraulic end conveying device of hydrochloric acid corrosion resistant diaphragm pump
CN102313040B (en) Ceramic ball valve
CN202302432U (en) Axial double-channel sealing structure for thin-wall flange flat groove for use under complex working condition
CN207500544U (en) A kind of spherical shape plugging type check valve
CN211778938U (en) Piston assembly for slurry transfer pump
CN202732437U (en) Fluoroplastic alloy submerged pump
CN2748739Y (en) Conduit coupling apparatus
CN208934932U (en) A kind of wear-resisting Sand pump
CN211874736U (en) Anticorrosive submerged centrifugal slurry pump
CN201326863Y (en) Direct-buried internal pressure compensator
CN101251202B (en) One-way horizontal check valve
CN214889011U (en) Novel metal hard seal floating ball valve structure
CN214093041U (en) Novel mechanical seal device for shaft
CN2057226U (en) Corrosion resisting plunger metering pump
CN220910743U (en) Hidden double-sleeve buckling wear-resistant high-pressure joint and composite pipe
CN202152736U (en) Combined pickling pump
CN220770473U (en) High-pressure-bearing nodular cast iron pipe connecting structure
CN114279151B (en) Telescopic cooling liquid transmission device
CN219570900U (en) Nested upward-expansion type discharging valve
CN210484240U (en) Anti-corrosion hydraulic cylinder

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