CN111503329A - A multistage voltage regulator for natural gas recovery - Google Patents
A multistage voltage regulator for natural gas recovery Download PDFInfo
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- CN111503329A CN111503329A CN202010371072.2A CN202010371072A CN111503329A CN 111503329 A CN111503329 A CN 111503329A CN 202010371072 A CN202010371072 A CN 202010371072A CN 111503329 A CN111503329 A CN 111503329A
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- pressure regulating
- regulating mechanism
- natural gas
- gas recovery
- threaded rod
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- 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
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/20—Excess-flow valves
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- 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
- F16K27/00—Construction of housing; Use of materials therefor
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Fluid Pressure (AREA)
Abstract
The invention discloses a multi-stage pressure regulator for natural gas recovery, which comprises a base, an elastic mechanism, a primary pressure regulating mechanism and a secondary pressure regulating mechanism, wherein the elastic mechanism is symmetrically and fixedly arranged at both ends of the top of the base, the top of the elastic mechanism is fixedly connected with the bottom of a machine body, a machine cover is slidably connected with the top of the machine body, the primary pressure regulating mechanism is fixedly arranged at the center of the top of the machine cover, the output end of the primary pressure regulating mechanism is rotatably connected with an eccentric rotary drum through a rotating shaft, a plurality of mounting grooves are uniformly formed in the side wall of the eccentric rotary drum, first springs are symmetrically and fixedly arranged in the mounting grooves of the eccentric rotary drum from top to bottom, one ends of the first springs, which are far away from the eccentric rotary drum, are fixedly connected with one end of a push rod, the multi-stage pressure regulator for natural gas recovery has a simple structure and convenient operation, and realizes, the practicability is higher.
Description
Technical Field
The invention relates to the technical field of natural gas recovery, in particular to a multi-stage pressure regulator for natural gas recovery.
Background
Natural gas is a gaseous fossil fuel consisting primarily of methane. It is mainly found in oil fields and natural gas fields, and also in coal seams in small quantities. Natural gas is also buried in underground closed geological structures like crude oil, and some are stored at the same level as crude oil and some exist independently. For natural gas that is stored at the same level as the crude oil, it is produced along with the crude oil. The natural gas is mainly used as fuel, can be used for producing carbon black, chemicals and liquefied petroleum gas, and the propane and butane produced by the natural gas are important raw materials of modern industry. Natural gas is composed mainly of gaseous low molecular hydrocarbons mixed with non-hydrocarbon gases.
The atmospheric pressure of natural gas needs to be adjusted when retrieving, is unfavorable for personnel's operation otherwise, needs carry out the regulation of pressure size to it in the accommodation process of atmospheric pressure, and the atmospheric pressure of once is adjusted not only the degree of difficulty big and difficult realization, for this reason, we propose a multistage voltage regulator for natural gas is retrieved.
Disclosure of Invention
The present invention is directed to a multi-stage pressure regulator for natural gas recovery, which solves the above problems of the prior art.
In order to achieve the purpose, the invention provides the following technical scheme: a multi-stage pressure regulator for natural gas recovery comprises a base, an elastic mechanism, a primary pressure regulating mechanism and a secondary pressure regulating mechanism, wherein the elastic mechanism is symmetrically and fixedly installed at both ends of the top of the base, the top of the elastic mechanism is fixedly connected with the bottom of a machine body, a machine cover is slidably connected to the top of the machine body, the primary pressure regulating mechanism is fixedly installed at the center of the top of the machine cover, the output end of the primary pressure regulating mechanism is rotatably connected with an eccentric rotary drum through a rotating shaft, a plurality of mounting grooves are uniformly formed in the side wall of the eccentric rotary drum, first springs are symmetrically and fixedly installed in the mounting grooves of the eccentric rotary drum from top to bottom, one ends of the first springs, far away from the eccentric rotary drum, are fixedly connected with one ends of ejector rods, the ends of the ejector rods, far away from the first springs, are fixedly installed, one end fixed mounting of frame has the second grade pressure regulating mechanism, the top of second grade pressure regulating mechanism is connected with the lateral wall meshing of cover.
Preferably, the elastic mechanism comprises a compression rod, a second spring and an installation cylinder, the installation cylinder is symmetrically and fixedly installed at the bottom of the machine body, the second spring is fixedly installed inside the installation cylinder, the compression rod is fixedly installed at one end, far away from the installation cylinder, of the second spring, the compression rod is fixedly installed at the top of the base, far away from the installation cylinder, of the compression rod, and the lower end of the installation cylinder is provided with a limit bump.
Preferably, the primary pressure regulating mechanism comprises a mounting seat, a first regulating threaded rod, a first sealing sheet, a second sealing sheet and a nut boss, the mounting seat is fixedly arranged at the top of the machine cover, the two sides of the mounting seat are both provided with matching grooves, the matching grooves of the mounting seat are connected with a first sealing sheet and a second sealing sheet in a sliding way, one end of the first sealing sheet is fixedly connected with one end of the second sealing sheet, a nut boss is fixedly arranged at the top of the joint of the first sealing sheet and the second sealing sheet, an installation convex block is arranged at one end of the top of the installation seat, and the mounting lug on the top of the mounting seat is provided with a through hole, the top of the mounting seat is rotationally connected with a first adjusting threaded rod through a rotating shaft, and one end of the first adjusting threaded rod is meshed with the top of the nut boss, and the bottom of the nut boss is rotatably connected with the top of the eccentric rotary drum through a rotating shaft.
Preferably, second grade pressure regulating mechanism includes second adjusting threaded rod, threaded sleeve and prevents turning round the strengthening rib, threaded sleeve fixed mounting is in the one end of frame, just the junction of threaded sleeve and frame is through preventing turning round strengthening rib fixed connection, the meshing of threaded sleeve's top is connected with second adjusting threaded rod, the top of second adjusting threaded rod is rotated through the pivot and is connected in one side of cover, just the installation lug has been seted up to one side of cover.
Preferably, the inside top fixed mounting of organism has the pressure disk, just the decorative pattern is seted up at the top of pressure disk.
Preferably, the side edge of the second adjusting threaded rod is provided with a limiting groove, the inner side of the top of the threaded sleeve is provided with a limiting lug, and the limiting lug of the threaded sleeve is matched with the limiting groove of the second adjusting threaded rod.
Compared with the prior art, the invention has the beneficial effects that: when equipment begins to work, it is inside that gaseous enters into equipment by the inlet port, carry out first step's regulation to equipment by one-level pressure regulating mechanism earlier, carry out preliminary regulation and control to the atmospheric pressure that needs the exhaust gas, second grade pressure regulating mechanism cooperation one-level pressure regulating mechanism regulates and control exhaust gas's atmospheric pressure jointly afterwards, thereby reach the purpose of multistage regulation, realize the regulation and control to exhaust gas atmospheric pressure, elastic support of elastic mechanism, the smoothness nature of equipment in the whole regulation work has been guaranteed, the personnel of being convenient for operate, and the holistic leakproofness of equipment has guaranteed equipment security and stability at the during operation, have the security to user's safety, this multistage voltage regulator for natural gas recovery simple structure, the simple operation, realized the regulation work to natural gas atmospheric pressure under the operational environment who ensures safety and stability, the practicality is higher.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of a primary pressure regulating mechanism;
FIG. 3 is a schematic top view of a portion of the present invention;
FIG. 4 is a schematic cross-sectional view of the spring mechanism;
FIG. 5 is a schematic view of a secondary pressure regulating mechanism;
fig. 6 is a partial schematic view of a two-stage pressure regulating mechanism.
In the figure: 1. a base; 2. an elastic mechanism; 3. a primary pressure regulating mechanism; 4. a secondary pressure regulating mechanism; 5. a body; 6. a machine cover; 7. an eccentric rotating drum; 8. a first spring; 9. a top rod; 10. a flexible friction head; 11. A frame; 12. a compression rod; 13. a second spring; 14. mounting the cylinder; 15. a mounting seat; 16. a first adjusting threaded rod; 17. a first sealing sheet; 18. a second sealing sheet; 19. a nut boss; 20. a second adjusting threaded rod; 21. a threaded sleeve; 22. anti-twist reinforcing ribs; 23. and (7) pressing a plate.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-6, the present invention provides a technical solution: a multi-stage pressure regulator for natural gas recovery comprises a base 1, an elastic mechanism 2, a first-stage pressure regulating mechanism 3 and a second-stage pressure regulating mechanism 4, wherein the elastic mechanism 2 is symmetrically and fixedly installed at both ends of the top of the base 1, the top of the elastic mechanism 2 is fixedly connected with the bottom of a machine body 5, the top of the machine body 5 is slidably connected with a machine cover 6, the first-stage pressure regulating mechanism 3 is fixedly installed at the center of the top of the machine cover 6, the output end of the first-stage pressure regulating mechanism 3 is rotatably connected with an eccentric rotary drum 7 through a rotating shaft, a plurality of installation grooves are uniformly formed in the side wall of the eccentric rotary drum 7, first springs 8 are symmetrically and fixedly installed in the installation grooves of the eccentric rotary drum 7 from top to bottom, one ends of the first springs 8, which are far away from the eccentric rotary drum 7, are fixedly connected with one end of a push rod 9, the top central authorities fixed mounting of base 1 has frame 11, the one end fixed mounting of frame 11 has second grade pressure regulating mechanism 4, the top of second grade pressure regulating mechanism 4 is connected with the lateral wall meshing of cover 6, the eccentricity of eccentric rotary drum 7 is adjusted to one-level pressure regulating mechanism 3, the existence of first spring 8 is convenient for realize that ejector pin 9 and flexible friction head 10 still laminate in the inside of organism 5, reciprocate of cover 6 is adjusted to second grade pressure regulating mechanism 4, drive the removal of one-level pressure regulating mechanism 3 on the cover 6 simultaneously, and then make eccentric rotary drum 7 and pressure disk 23 laminate more, so as to increase the frictional force between eccentric rotary drum 7 and pressure disk 23, elastic mechanism 2 is convenient for cooperate second grade pressure regulating mechanism 4 to form elastic support to the pressure of organism 5, inlet port and exhaust hole have been seted up to the side of organism 5, eccentric rotary drum 7, organism 5, cover 6 in addition, The platen 23 forms a closed chamber whether or not it is moved.
The first-level pressure regulating mechanism 3 comprises an installation seat 15, a first adjusting threaded rod 16, a first sealing sheet 17, a second sealing sheet 18 and a nut boss 19, the installation seat 15 is fixedly installed at the top of the cover 6, matching grooves are formed in the two sides of the installation seat 15, the first sealing sheet 17 and the second sealing sheet 18 are connected in the matching grooves of the installation seat 15 in a sliding mode, one end of the first sealing sheet 17 is fixedly connected with one end of the second sealing sheet 18, the nut boss 19 is fixedly installed at the top of the joint of the first sealing sheet 17 and the second sealing sheet 18, an installation bump is formed at one end of the top of the installation seat 15, a through hole is formed in the installation bump at the top of the installation seat 15, the top of the installation seat 15 is connected with the first adjusting threaded rod 16 through a rotating shaft, and one end of the first adjusting threaded rod 16 is connected with the top of the nut boss 19 in, the bottom of the nut boss 19 is rotatably connected with the top of the eccentric rotary drum 7 through a rotating shaft, a closed environment is formed on equipment due to the existence of the first sealing piece 17 and the second sealing piece 18, the installation seat 15 facilitates the installation of the first-level pressure regulating mechanism 3 and limits the first sealing piece 17 and the second sealing piece 18, and the first adjusting threaded rod 16 and the nut boss 19 are matched with each other to facilitate the adjustment of the eccentricity of the eccentric rotary drum 7.
Secondary pressure regulating mechanism 4 includes second adjusting threaded rod 20, threaded sleeve 21 and prevents turning round strengthening rib 22, threaded sleeve 21 fixed mounting is in the one end of frame 11, just threaded sleeve 21 and frame 11's junction is through preventing turning round strengthening rib 22 fixed connection, the top meshing of threaded sleeve 21 is connected with second adjusting threaded rod 20, second adjusting threaded rod 20's top is rotated through the pivot and is connected in one side of cover 6, just the installation lug has been seted up to one side of cover 6, and threaded sleeve 21 and prevent turning round strengthening rib 22's existence is convenient for to the fixed mounting of secondary pressure regulating mechanism 4, and the existence of second adjusting threaded rod 20 is convenient for adjust the interval between eccentric rotary drum 7 and the pressure disk 23, is convenient for realize the regulation of the frictional force of equipment.
The inside top fixed mounting of organism 5 has pressure disk 23, just the decorative pattern has been seted up at pressure disk 23's top, and the increase of frictional force is realized to the regulation of frictional force between eccentric rotary drum 7 and the pressure disk 23 to the cooperation second grade pressure regulating mechanism 4 of being convenient for.
The limit groove has been seted up to the side of second adjusting threaded rod 20, limit lug has been seted up to threaded sleeve 21's top inboard, threaded sleeve 21's limit lug and second adjusting threaded rod 20's limit groove mutually support, are convenient for spacing second adjusting threaded rod 20 when frictional force has been transferred, prevent it from taking place the displacement, and then have changed the size of frictional force.
The working principle is as follows: natural gas enters the equipment from an air inlet, the first-level pressure regulating mechanism 3 firstly regulates the eccentricity of the eccentric rotary drum 7, the first regulating threaded rod 16 and the nut boss 19 are mutually matched to facilitate the regulation of the eccentricity of the eccentric rotary drum 7, the mounting seat 15 facilitates the fixed mounting of the first-level pressure regulating mechanism 3, the first sealing sheet 17 and the second sealing sheet 18 facilitate the matching of the cover 6 to form the tightness of the equipment, the mutual matching of the first spring 8, the ejector rod 9 and the flexible friction head 10 facilitates the realization of the independence and the tightness of a small space inside the equipment, the realization of the regulation of the equipment on the air pressure of the natural gas is facilitated, the second-level pressure regulating mechanism 4 facilitates the further realization of the regulation on the air pressure of the natural gas, the second regulating threaded rod 20 facilitates the regulation of the friction force between the eccentric rotary drum 7 and the pressure plate 23, the threaded sleeve 21 and the anti-twist reinforcing ribs 22 facilitate the fixed mounting of the second, elastic mechanism 2 is convenient for realize the elastic support to equipment, and secondary atmospheric pressure is adjusted in better cooperation secondary pressure regulating mechanism 4 completion, and the fixed mounting of elastic mechanism 2 is convenient for realize in the mutually supporting of compression pole 12 and installation section of thick bamboo 14, and the existence of second spring 13 makes elastic mechanism 2 possess and forms elastic support to equipment, and the equipment realization of being convenient for of mutually supporting of one-level pressure regulating mechanism 3 and secondary pressure regulating mechanism 4 controls exhaust gas pressure size.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The utility model provides a multistage voltage regulator for natural gas recovery, includes base (1), elastic mechanism (2), one-level pressure regulating mechanism (3) and second grade pressure regulating mechanism (4), its characterized in that: the automatic pressure regulating device is characterized in that elastic mechanisms (2) are symmetrically and fixedly mounted at two ends of the top of the base (1), the top of each elastic mechanism (2) is fixedly connected with the bottom of the machine body (5), a machine cover (6) is slidably connected to the top of the machine body (5), a primary pressure regulating mechanism (3) is fixedly mounted at the center of the top of the machine cover (6), the output end of the primary pressure regulating mechanism (3) is rotatably connected with an eccentric rotary drum (7) through a rotating shaft, a plurality of mounting grooves are uniformly formed in the side wall of the eccentric rotary drum (7), first springs (8) are symmetrically and fixedly mounted in the mounting grooves of the eccentric rotary drum (7) from top to bottom, one ends, far away from the eccentric rotary drum (7), of the first springs (8) are fixedly connected with one end of a push rod (9), and one end, far away from the first springs (8), of the, the top central authorities fixed mounting of base (1) has frame (11), the one end fixed mounting of frame (11) has second grade pressure regulating mechanism (4), the top of second grade pressure regulating mechanism (4) is connected with the lateral wall meshing of cover (6).
2. The multi-stage pressure regulator for natural gas recovery of claim 1, wherein: elastic mechanism (2) are including compressing pole (12), second spring (13) and installation section of thick bamboo (14), installation section of thick bamboo (14) symmetry fixed mounting is in the bottom of organism (5), the equal fixed mounting in inside of installation section of thick bamboo (14) has second spring (13), the equal fixed mounting in one end of keeping away from installation section of thick bamboo (14) of second spring (13) has compressing pole (12), just the equal fixed mounting in the top of base (1) of one end that installation section of thick bamboo (14) was kept away from in compression pole (12), the low side of installation section of thick bamboo (14) all is equipped with spacing lug.
3. The multi-stage pressure regulator for natural gas recovery of claim 1, wherein: the first-level pressure regulating mechanism (3) comprises a mounting seat (15), a first adjusting threaded rod (16), a first sealing sheet (17), a second sealing sheet (18) and a nut boss (19), wherein the mounting seat (15) is fixedly mounted at the top of the cover (6), matching grooves are formed in the two sides of the mounting seat (15), the first sealing sheet (17) and the second sealing sheet (18) are connected in the matching grooves of the mounting seat (15) in a moving mode, one end of the first sealing sheet (17) is fixedly connected with one end of the second sealing sheet (18), the nut boss (19) is fixedly mounted at the top of the connecting part of the first sealing sheet (17) and the second sealing sheet (18), an installation lug is formed in one end of the top of the mounting seat (15), a through hole is formed in the installation lug at the top of the mounting seat (15), the first adjusting threaded rod (16) is connected to the top of the mounting seat (15) through a rotating shaft, .
4. The multi-stage pressure regulator for natural gas recovery of claim 1, wherein: secondary pressure regulating mechanism (4) include second adjusting threaded rod (20), threaded sleeve (21) and prevent turning round strengthening rib (22), threaded sleeve (21) fixed mounting is in the one end of frame (11), just the junction of threaded sleeve (21) and frame (11) is through preventing turning round strengthening rib (22) fixed connection, the top meshing of threaded sleeve (21) is connected with second adjusting threaded rod (20).
5. The multi-stage pressure regulator for natural gas recovery of claim 1, wherein: the inside top fixed mounting of organism (5) has pressure disk (23), just the decorative pattern has been seted up at the top of pressure disk (23).
6. The multi-stage pressure regulator for natural gas recovery of claim 4, wherein: the side of the second adjusting threaded rod (20) is provided with a limiting groove, the inner side of the top of the threaded sleeve (21) is provided with a limiting lug, and the limiting lug of the threaded sleeve (21) is matched with the limiting groove of the second adjusting threaded rod (20).
7. The multi-stage pressure regulator for natural gas recovery of claim 4, wherein: the top of the second adjusting threaded rod (20) is rotatably connected to one side of the cover (6) through a rotating shaft, and one side of the cover (6) is provided with an installation convex block.
8. A multi-stage pressure regulator for natural gas recovery as defined in claim 3, wherein: one end of the first adjusting threaded rod (16) is meshed with the top of the nut boss (19), and the bottom of the nut boss (19) is rotatably connected with the top of the eccentric rotary drum (7) through a rotating shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010371072.2A CN111503329B (en) | 2020-05-06 | 2020-05-06 | A multistage voltage regulator for natural gas recovery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010371072.2A CN111503329B (en) | 2020-05-06 | 2020-05-06 | A multistage voltage regulator for natural gas recovery |
Publications (2)
| Publication Number | Publication Date |
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| CN111503329A true CN111503329A (en) | 2020-08-07 |
| CN111503329B CN111503329B (en) | 2021-10-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010371072.2A Active CN111503329B (en) | 2020-05-06 | 2020-05-06 | A multistage voltage regulator for natural gas recovery |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB569658A (en) * | 1941-11-17 | 1945-06-04 | George Dexter | Improvements in hydraulic power-transmission or remote-control systems |
| CN1169178A (en) * | 1995-12-29 | 1997-12-31 | 罗伯特·博施有限公司 | System for high pressure prodn. for fuel injection system fitted in internal combustion engines |
| CN2628826Y (en) * | 2003-06-27 | 2004-07-28 | 关芬硇 | Gas combustion pressure regulator with emergency cut-off device |
| CN101131152A (en) * | 2007-10-16 | 2008-02-27 | 天津市泽华源泵业科技发展有限公司 | Constant-pressure variable radial-plunger pump |
| CN201137526Y (en) * | 2007-11-15 | 2008-10-22 | 张杨 | Internal combustion engine piston pin eccentric wheel gas pressure automatic regulating device |
-
2020
- 2020-05-06 CN CN202010371072.2A patent/CN111503329B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB569658A (en) * | 1941-11-17 | 1945-06-04 | George Dexter | Improvements in hydraulic power-transmission or remote-control systems |
| CN1169178A (en) * | 1995-12-29 | 1997-12-31 | 罗伯特·博施有限公司 | System for high pressure prodn. for fuel injection system fitted in internal combustion engines |
| US5884606A (en) * | 1995-12-29 | 1999-03-23 | Robert Bosch Gmbh | System for generating high fuel pressure for a fuel injection system used in internal combustion engines |
| CN2628826Y (en) * | 2003-06-27 | 2004-07-28 | 关芬硇 | Gas combustion pressure regulator with emergency cut-off device |
| CN101131152A (en) * | 2007-10-16 | 2008-02-27 | 天津市泽华源泵业科技发展有限公司 | Constant-pressure variable radial-plunger pump |
| CN201137526Y (en) * | 2007-11-15 | 2008-10-22 | 张杨 | Internal combustion engine piston pin eccentric wheel gas pressure automatic regulating device |
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| CN111503329B (en) | 2021-10-08 |
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Effective date of registration: 20210922 Address after: 266300 No. 435, Lanzhou East Road, Jiaozhou, Qingdao, Shandong Applicant after: Jiaozhou Taikun Natural Gas Co.,Ltd. Address before: Room 218, building 3, Xinggong science and Technology Park, No. 100 Luyun Road, high tech Development Zone, Changsha City, Hunan Province Applicant before: CHANGSHA NINGHU MACHINERY EQUIPMENT Co.,Ltd. |
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