CN215411344U - Venturi secondary multistage phase change adjusting type steam economizer - Google Patents
Venturi secondary multistage phase change adjusting type steam economizer Download PDFInfo
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- CN215411344U CN215411344U CN202120272764.1U CN202120272764U CN215411344U CN 215411344 U CN215411344 U CN 215411344U CN 202120272764 U CN202120272764 U CN 202120272764U CN 215411344 U CN215411344 U CN 215411344U
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Abstract
The utility model belongs to the technical field of steam energy-saving devices, and particularly relates to a Venturi secondary multistage phase change adjusting type steam energy-saving device which comprises a main shell, an upper cover and an adjusting component, wherein the main shell is provided with a plurality of grooves; the upper cover is fixedly connected to the top of the main shell through upper cover fixing screws; the adjusting component is arranged inside the main shell; the adjusting assembly comprises an adjusting rod, an adjusting rod limiting sleeve, a first phase change mechanism and a second phase change mechanism; the adjusting rod limiting sleeve is fixedly connected to the top of the upper cover through a screw; the adjusting rod is connected to the inner side wall of the adjusting rod limiting sleeve through threads, one end of the adjusting rod penetrates through the upper cover and is located inside the main shell, and the bottom end of the adjusting rod is fixedly connected with a valve rod; the first phase change mechanism is arranged in the main shell; the second phase change mechanism is arranged in the main shell; accurate drainage is achieved by adjusting the first vapor-liquid phase change nozzle, meanwhile, the effect of steam loss is effectively prevented, the second phase change mechanism enables condensed water to achieve a full condensation effect, and the effect of efficiency improvement and steam saving is achieved.
Description
Technical Field
The utility model belongs to the technical field of steam energy-saving devices, and particularly relates to a Venturi secondary multistage phase change adjusting type steam energy-saving device.
Background
The steam trap, also known as a steam trap, is used for equipment using steam only because the equipment using steam must produce condensed water during heat exchange, the condensed water absorbs steam energy to reduce steam quality, the enthalpy of the steam is reduced to reduce heat exchange rate, the condensed water becomes harmful fluid, and air and non-condensable gas are mixed, so that equipment failure and performance reduction are caused.
In the prior art, the main problems of the traditional steam trap ubiquitous are that condensed water cannot be timely drained, steam leakage and pressure relief are simultaneously carried out during drainage, the service life is short, the aging is fast, and faults are easily caused, so that the heat pipe network has energy waste caused by leakage, overflow and leakage.
SUMMERY OF THE UTILITY MODEL
In order to make up for the defects of the prior art and solve the main problems that the traditional steam trap in the prior art generally cannot discharge condensed water in time, steam leaks and pressure is relieved while water is drained, the service life is short, the aging is fast, faults are easy to occur, and energy waste caused by leakage and leakage of a heat pipe network exists, the utility model provides the venturi secondary multistage phase change adjustable steam economizer.
The technical scheme adopted by the utility model for solving the technical problems is as follows: the utility model relates to a Venturi secondary multistage phase change adjusting type steam economizer which comprises a main shell, an upper cover and an adjusting assembly, wherein the main shell is provided with a plurality of grooves; the upper cover is fixedly connected to the top of the main shell through upper cover fixing screws; the adjusting component is arranged inside the main shell; the adjusting assembly comprises an adjusting rod, an adjusting rod limiting sleeve, a first phase change mechanism and a second phase change mechanism; the adjusting rod limiting sleeve is fixedly connected to the top of the upper cover through a screw; the adjusting rod is connected to the inner side wall of the adjusting rod limiting sleeve through threads, one end of the adjusting rod penetrates through the upper cover and is located inside the main shell, and the bottom end of the adjusting rod is fixedly connected with a valve rod; the first phase change mechanism is arranged in the main shell; the second phase change mechanism is arranged in the main shell; during operation, when steam water gets into main casing internal portion, carry out steam-water separation through adjusting part to the steam water that gets into main casing internal portion, first phase change mechanism mainly plays steam-water quick separation's effect, and second phase change mechanism mainly plays siphon and gathers and the effect that steam-water secondary thoroughly separated to ensure that discharged water is the full condensation state.
Preferably, the first phase change mechanism comprises an upper drainage limiting block, a first phase change limiting block and a first vapor-liquid phase change nozzle; the first phase change limiting block is fixedly connected to the inner side wall of the main shell; the first vapor-liquid phase change nozzle is fixedly connected to the inner side wall of the first phase change limiting block; the upper drainage limiting block is fixedly connected to the top of the first phase change limiting block, and the interior of the upper drainage limiting block is communicated with the interior of the first vapor-liquid phase change nozzle; the during operation, when steam gets into main internal portion of casing, the steam condensate water gathers on upper drainage stopper, cooperation through adjusting pole and regulation pole stop collar, make the bottom and the upper drainage stopper of valve rod carry out cooperation, thereby change the opening size at upper drainage stopper top, adjust the flow size that the condensate water got into first vapour liquid phase change nozzle, the steam condensate water flows from first vapour liquid phase change nozzle bottom, and main internal portion of casing's valve rod is equipped with a plurality ofly, can adjust the flow size that the condensate water got into first vapour liquid phase change nozzle according to the flow size of condensate water, thereby reach accurate hydrophobic effect.
Preferably, the second phase change mechanism comprises a spacer bush, a bottom drainage limiting block, a second phase change limiting block and a second vapor-liquid phase change nozzle; the second phase change limiting block is fixedly connected to the inner side wall of the main shell; the second vapor-liquid phase change nozzle is fixedly connected to the inner side wall of the second phase change limiting block; the second phase change limiting block is fixedly connected to the top of the second phase change limiting block, and the interior of the second phase change limiting block is communicated with the second vapor-liquid phase change nozzle; the bottom of the spacer bush is fixedly connected to the top of the bottom drainage limiting block, and the top of the spacer bush is connected with the bottom of the first phase change limiting block in a buckling manner; during operation, when the condensate water flows out from first vapour-liquid phase change nozzle bottom, the condensate water gets into second vapour-liquid phase change nozzle through the opening at bottom drainage stopper top, is connected through the spacer bush between first phase change stopper and the second phase change stopper to be equipped with the release space, play siphon and condense and the effect of vapour-water secondary thoroughly separation, ensure that the discharged condensate water is the state of condensing entirely.
Preferably, a filtering mechanism is arranged inside the main shell; the filtering mechanism comprises a filter screen framework, an inner filter screen, a sewage discharge connecting pipe and a sewage discharge plug; the filter screen framework is fixedly connected to the inner side wall of the main shell; the inner filter screen is sleeved outside the filter screen framework; the sewage discharge connecting pipe is fixedly connected to the side wall of the main shell; the sewage discharge plug is fixedly connected to the sewage discharge connecting pipe through a sewage discharge plug connecting screw; during operation, when steam water got into main casing internal portion, the interior filter screen that the outside cover of filter screen skeleton was established filtered steam water to make the impurity of steam water get rid of, when needs were cleaned the interior filter screen, open the blowdown end cap, and then realize the regular cleaning maintenance work to the interior filter screen, thereby guarantee the filter effect of interior filter screen.
Preferably, a first flange connecting pipe is fixedly connected to the side wall of the main shell; the outer side wall of the first flange connecting pipe is fixedly connected with a steam-water inlet flange, and the first flange connecting pipe is communicated with the interior of the main shell; during operation, steam and water enter the first flange connecting pipe, and the first flange connecting pipe is communicated with the interior of the main shell, so that the steam and water entering the interior of the first flange connecting pipe enter the interior of the main shell.
Preferably, the bottom of the main shell is fixedly connected with a condensed water drainage tube, and the bottom of the main shell is fixedly connected with a lower cover connecting screw; the bottom of the condensed water drainage tube is fixedly connected with a condensed water discharge bent tube; the end part of the condensation discharge elbow is fixedly connected with a second flange connecting pipe; a condensed water outlet flange is fixedly connected to the outer side wall of the second flange connecting pipe; during operation, the inside and the main casing body of condensate drainage pipe intercommunication, it is inside to congeal water and get into the condensate drainage pipe when flowing from second vapour phase transition nozzle, congeals water and gets into second flange joint pipe behind the row of the elbow pipe that congeals to make the condensate discharge from second flange joint pipe.
The utility model has the following beneficial effects:
1. according to the Venturi secondary multistage phase change adjusting type steam economizer, accurate drainage is achieved through the matched work of the main shell, the upper cover, the adjusting rod limiting sleeve, the upper layer drainage limiting block, the first phase change limiting block, the first steam-liquid phase change nozzle, the spacer bush, the bottom drainage limiting block, the second phase change limiting block, the second steam-liquid phase change nozzle and the valve rod, steam loss is effectively prevented, condensate water is in a fully condensed state when being discharged, the stability of process temperature and process pressure of heat utilization equipment is guaranteed, and the effects of improving efficiency and saving steam are achieved.
2. According to the Venturi secondary multistage phase change adjusting type steam economizer, when steam water enters the main shell, the inner filter screen sleeved outside the filter screen framework filters the steam water, so that impurities in the steam water are removed, when the inner filter screen needs to be cleaned, the sewage discharge plug is opened, regular cleaning and maintenance work of the inner filter screen is further achieved, and the filtering effect of the inner filter screen is guaranteed.
Drawings
The utility model will be further explained with reference to the drawings.
FIG. 1 is a partial cross-sectional view of the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1 at A;
FIG. 3 is an enlarged view of a portion of FIG. 1 at B;
FIG. 4 is a schematic three-dimensional structure of the first phase change stopper according to the present invention.
In the figure: 1. a main housing; 11. a first flange connection pipe; 12. a steam water inlet flange; 13. a condensate drainage tube; 14. the lower cover is connected with a screw; 15. a condensation discharge bent pipe; 16. a second flange connection pipe; 17. a condensate outlet flange; 2. an upper cover; 3. an adjustment assembly; 31. adjusting a rod; 32. a regulating rod limiting sleeve; 33. a first phase change mechanism; 331. an upper drainage limiting block; 332. a first phase change stopper; 333. a first vapor-liquid phase change nozzle; 34. a second phase change mechanism; 341. a spacer sleeve; 342. a bottom drainage limiting block; 343. a second phase change stopper; 344. a second vapor-liquid phase change nozzle; 35. a valve stem; 4. a filtering mechanism; 41. a filter screen framework; 42. an inner filter screen; 43. a sewage draining connecting pipe; 44. blowdown end cap.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the utility model easy to understand, the utility model is further described with the specific embodiments.
As shown in fig. 1 to 4, the venturi secondary multistage phase change regulating type steam economizer of the present invention comprises a main housing 1, an upper cover 2 and a regulating assembly 3; the upper cover 2 is fixedly connected to the top of the main shell 1 through upper cover fixing screws; the adjusting component 3 is arranged inside the main shell 1; the adjusting component 3 comprises an adjusting rod 31, an adjusting rod limiting sleeve 32, a first phase change mechanism 33 and a second phase change mechanism 34; the adjusting rod limiting sleeve 32 is fixedly connected to the top of the upper cover 2 through a screw; the adjusting rod 31 is connected to the inner side wall of the adjusting rod limiting sleeve 32 through threads, one end of the adjusting rod 31 penetrates through the upper cover 2 and is located inside the main shell 1, and the bottom end of the adjusting rod 31 is fixedly connected with a valve rod 35; the first phase change mechanism 33 is arranged inside the main shell 1; the second phase change mechanism 34 is disposed inside the main casing 1; during operation, inside steam and water got into main casing body 1, carry out steam-water separation through adjusting part 3 to the inside soda that gets into main casing body 1, first phase change mechanism 33 mainly plays steam-water quick separation's effect, and second phase change mechanism 34 mainly plays siphon and gathers and the effect that steam and water secondary thoroughly separated to ensure that the discharged water is the full condensation state.
As an embodiment of the present invention, the first phase change mechanism 33 includes an upper drainage limiting block 331, a first phase change limiting block 332, and a first vapor-liquid phase change nozzle 333; the first phase change limiting block 332 is fixedly connected to the inner side wall of the main shell 1; the first vapor-liquid phase change nozzle 333 is fixedly connected to the inner side wall of the first phase change limiting block 332; the upper drainage limiting block 331 is fixedly connected to the top of the first phase change limiting block 332, and the interior of the upper drainage limiting block is communicated with the interior of the first vapor-liquid phase change nozzle 333; the during operation, when steam gets into main casing body 1 inside, the steam condensate gathers on upper drainage stopper 331, cooperation through adjusting pole 31 and regulation pole stop collar 32, make the bottom of valve rod 35 carry out cooperation with upper drainage stopper 331, thereby change the opening size at upper drainage stopper 331 top, adjust the flow size that the condensate got into first vapour and liquid phase change nozzle 333, the steam condensate flows from first vapour and liquid phase change nozzle 333 bottom, and main casing body 1 inside valve rod 35 is equipped with a plurality ofly, can adjust the flow size that the condensate got into first vapour and liquid phase change nozzle 333 according to the flow size of condensate, thereby reach accurate hydrophobic effect, effectively prevent steam to run off simultaneously.
As an embodiment of the present invention, the second phase change mechanism 34 includes a spacer sleeve 341, a bottom drainage limiting block 342, a second phase change limiting block 343, and a second vapor-liquid phase change nozzle 344; the second phase change limiting block 343 is fixedly connected to the inner side wall of the main housing 1; the second vapor-liquid phase change nozzle 344 is fixedly connected to the inner side wall of the second phase change limiting block 343; the second phase change limiting block 343 is fixedly connected to the top of the second phase change limiting block 343, and the interior of the second phase change limiting block 343 is communicated with the second vapor-liquid phase change nozzle 344; the bottom of the spacer sleeve 341 is fixedly connected to the top of the bottom drainage limiting block 342, and the top of the spacer sleeve 341 is connected with the bottom of the first phase change limiting block 332 in a buckling manner; when the device works, when condensate water flows out from the bottom end of the first vapor-liquid phase change nozzle 333, the condensate water enters the second vapor-liquid phase change nozzle 344 through an opening in the top of the bottom drainage limiting block 342, the first phase change limiting block 332 is connected with the second phase change limiting block 343 through the spacer sleeve 341, and a release space is arranged, so that siphon condensation and secondary thorough separation of vapor and water are achieved, the discharged condensate water is ensured to be in a fully condensed state, the stability of the process temperature and the process pressure of heat utilization equipment is ensured, and the effect of efficiency improvement and steam saving is achieved.
As an embodiment of the present invention, a filtering mechanism 4 is provided inside the main housing 1; the filtering mechanism 4 comprises a filter screen framework 41, an inner filter screen 42, a pollution discharge connecting pipe 43 and a pollution discharge plug 44; the filter screen framework 41 is fixedly connected to the inner side wall of the main shell 1; the inner filter screen 42 is sleeved outside the filter screen framework 41; the pollution discharge connecting pipe 43 is fixedly connected to the side wall of the main shell 1; the pollution discharge plug 44 is fixedly connected to the pollution discharge connecting pipe 43 through a pollution discharge plug connecting screw; during operation, when steam water gets into main casing body 1 inside, the interior filter screen 42 that the outside cover of filter screen skeleton 41 was established filters steam water to make the impurity of steam water in got rid of, when needs are cleaned interior filter screen 42, open blowdown end cap 44, and then realize the regular cleaning maintenance work to interior filter screen 42, thereby guarantee interior filter screen 42's filtering action.
As an embodiment of the present invention, a first flange connecting pipe 11 is fixedly connected to a side wall of the main housing 1; a steam-water inlet flange 12 is fixedly connected to the outer side wall of the first flange connecting pipe 11, and the first flange connecting pipe 11 is communicated with the interior of the main shell 1; during operation, inside steam water got into first flange joint pipe 11, first flange joint pipe 11 and the inside intercommunication of main casing body 1 to make the inside steam water that gets into first flange joint pipe 11 get into main casing body 1 inside.
As an embodiment of the present invention, a condensed water drainage tube 13 is fixedly connected to the bottom of the main housing 1, and a lower cover connecting screw 14 is fixedly connected to the bottom of the main housing 1; the bottom of the condensed water drainage tube 13 is fixedly connected with a condensation discharge elbow 15; the end part of the condensation discharge elbow 15 is fixedly connected with a second flange connecting pipe 16; a condensed water outlet flange 17 is fixedly connected to the outer side wall of the second flange connecting pipe 16; during operation, the inside and the main casing body 1 inside intercommunication of drainage tube 13 congeals, congeals inside water gets into drainage tube 13 congeals when water flows out from second vapour phase transition nozzle 344, congeals water and gets into second flange joint pipe 16 behind the curved pipe 15 of arranging congeals to make congeals water and discharge from second flange joint pipe 16.
The working principle is as follows: steam water enters the first flange connecting pipe 11, the first flange connecting pipe 11 is communicated with the inside of the main casing 1, thereby steam water entering the inside of the first flange connecting pipe 11 enters the inside of the main casing 1, when steam water enters the inside of the filter screen framework 41, the inner filter screen 42 sleeved outside the filter screen framework 41 filters the steam water, thereby impurities in the steam water are removed, when the inner filter screen 42 needs to be cleaned, the pollution discharge plug 44 is opened, thereby realizing the regular cleaning and maintenance work of the inner filter screen 42, thereby ensuring the filtering action of the inner filter screen 42, steam condensate flows down from the inner filter screen 42, the steam condensate is gathered on the upper drainage limiting block 331, through the cooperation work of the adjusting rod 31 and the adjusting rod limiting sleeve 32, the bottom of the valve rod 35 cooperates with the opening on the upper drainage limiting block 331, thereby changing the size of the opening at the top of the upper drainage limiting block 331, the flow of the condensed water entering the first vapor-liquid phase-change nozzle 333 is adjusted, a plurality of valve rods 35 are arranged, the flow of the condensed water entering the first vapor-liquid phase-change nozzle 333 can be adjusted according to the flow of the condensed water, the condensed water of the steam flows out from the bottom of the first vapor-liquid phase-change nozzle 333 after entering the first vapor-liquid phase-change nozzle 333, so that the purposes of accurate drainage and effective prevention of steam loss are achieved, when the condensed water flows out from the bottom end of the first vapor-liquid phase-change nozzle 333, the condensed water enters the second vapor-liquid phase-change nozzle 344 through an opening at the top of the bottom drainage limiting block 342, the first phase-change limiting block 332 is connected with the second phase-change limiting block 343 through the spacer 341 and a release space is arranged, the effects of siphon condensation and secondary thorough separation of the steam and water are achieved, the discharged condensed water is in a fully condensed state, the interior of the condensed water drainage tube 13 is communicated with the interior of the main shell 1, and the condensed water enters the interior of the condensed water drainage tube 13 when flowing out from the second vapor-liquid phase-change nozzle 344, the condensate water enters the second flange connecting pipe 16 after the condensate discharging elbow pipe 15, so that the condensate water is discharged from the second flange connecting pipe 16, the saturated steam in the steam heating power pipe network is discharged with condensate water through the device, and the energy waste caused by leakage of the heating power pipe network is avoided.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention and for simplifying the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the scope of the present invention.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the utility model as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.
Claims (6)
1. The utility model provides a multistage phase transition regulation formula steam economizer of venturi secondary which characterized in that: comprises a main shell (1), an upper cover (2) and an adjusting component (3); the upper cover (2) is fixedly connected to the top of the main shell (1) through an upper cover fixing screw; the adjusting component (3) is arranged inside the main shell (1);
the adjusting assembly (3) comprises an adjusting rod (31), an adjusting rod limiting sleeve (32), a first phase change mechanism (33) and a second phase change mechanism (34); the adjusting rod limiting sleeve (32) is fixedly connected to the top of the upper cover (2) through screws; the adjusting rod (31) is connected to the inner side wall of the adjusting rod limiting sleeve (32) through threads, one end of the adjusting rod (31) penetrates through the upper cover (2) and is located inside the main shell (1), and the bottom end of the adjusting rod (31) is fixedly connected with a valve rod (35); the first phase change mechanism (33) is arranged inside the main shell (1); the second phase change mechanism (34) is provided inside the main casing (1).
2. The venturi secondary multistage phase change regulated steam economizer of claim 1 wherein: the first phase change mechanism (33) comprises an upper drainage limiting block (331), a first phase change limiting block (332) and a first vapor-liquid phase change nozzle (333); the first phase change limiting block (332) is fixedly connected to the inner side wall of the main shell (1); the first vapor-liquid phase change nozzle (333) is fixedly connected to the inner side wall of the first phase change limiting block (332); the upper drainage limiting block (331) is fixedly connected to the top of the first phase change limiting block (332), and the interior of the upper drainage limiting block is communicated with the interior of the first vapor-liquid phase change nozzle (333).
3. The venturi secondary multistage phase change regulated steam economizer of claim 2 wherein: the second phase change mechanism (34) comprises a spacer bush (341), a bottom drainage limiting block (342), a second phase change limiting block (343) and a second vapor-liquid phase change nozzle (344); the second phase change limiting block (343) is fixedly connected to the inner side wall of the main shell (1); the second vapor-liquid phase change nozzle (344) is fixedly connected to the inner side wall of the second phase change limiting block (343); the second phase change limiting block (343) is fixedly connected to the top of the second phase change limiting block (343), and the interior of the second phase change limiting block is communicated with the second vapor-liquid phase change nozzle (344); the bottom of the spacer sleeve (341) is fixedly connected to the top of the bottom drainage limiting block (342), and the top of the spacer sleeve (341) is connected with the bottom of the first phase change limiting block (332) in a buckling manner.
4. The venturi secondary multistage phase change regulated steam economizer of claim 3 wherein: a filtering mechanism (4) is arranged in the main shell (1); the filtering mechanism (4) comprises a filter screen framework (41), an inner filter screen (42), a sewage discharge connecting pipe (43) and a sewage discharge plug (44); the filter screen framework (41) is fixedly connected to the inner side wall of the main shell (1); the inner filter screen (42) is sleeved outside the filter screen framework (41); the sewage discharge connecting pipe (43) is fixedly connected to the side wall of the main shell (1); the pollution discharge plug (44) is fixedly connected to the pollution discharge connecting pipe (43) through a pollution discharge plug connecting screw.
5. The venturi secondary multistage phase change regulated steam economizer of claim 4 wherein: a first flange connecting pipe (11) is fixedly connected to the side wall of the main shell (1); the outer side wall of the first flange connecting pipe (11) is fixedly connected with a steam-water inlet flange (12), and the first flange connecting pipe (11) is communicated with the interior of the main shell (1).
6. The venturi secondary multistage phase change regulated steam economizer of claim 5 wherein: a condensed water drainage tube (13) is fixedly connected to the bottom of the main shell (1), and a lower cover connecting screw (14) is fixedly connected to the bottom of the main shell (1); a condensate discharging bent pipe (15) is fixedly connected to the bottom of the condensate drainage pipe (13); the end part of the condensation discharge bent pipe (15) is fixedly connected with a second flange connecting pipe (16); and a condensed water outlet flange (17) is fixedly connected to the outer side wall of the second flange connecting pipe (16).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120272764.1U CN215411344U (en) | 2021-01-31 | 2021-01-31 | Venturi secondary multistage phase change adjusting type steam economizer |
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| CN202120272764.1U CN215411344U (en) | 2021-01-31 | 2021-01-31 | Venturi secondary multistage phase change adjusting type steam economizer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113144658A (en) * | 2021-05-13 | 2021-07-23 | 凯恩(天津)节能环保科技有限公司 | Venturi secondary multistage phase change adjusting type steam economizer |
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2021
- 2021-01-31 CN CN202120272764.1U patent/CN215411344U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113144658A (en) * | 2021-05-13 | 2021-07-23 | 凯恩(天津)节能环保科技有限公司 | Venturi secondary multistage phase change adjusting type steam economizer |
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