CN109931271A - A kind of heat exchange type water pump - Google Patents
A kind of heat exchange type water pump Download PDFInfo
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- CN109931271A CN109931271A CN201910290221.XA CN201910290221A CN109931271A CN 109931271 A CN109931271 A CN 109931271A CN 201910290221 A CN201910290221 A CN 201910290221A CN 109931271 A CN109931271 A CN 109931271A
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Abstract
The invention discloses a kind of heat exchange type water pumps, including shell, impeller one, pump chamber one, input hole one, cold liquid input adapter, top cover, sealing ring one, motor cavity, motor, hydrothermal solution input adapter, input hole two, pump chamber two, impeller two, sealing ring two, outlet two, filter, side cover and heat exchanging chamber；The present invention have it is structurally reasonable it is simple, production cost is low, easy for installation, multiple functional, the motor of setting impeller one and impeller two can rotate together simultaneously, so as to ensure cold liquid such as hot liquid flow, to improve the effect of heat exchange；Cold liquid in the present invention in heat exchanging chamber can exchange heat with hot liquid outside in outer cooling tube, while interior cooling tube can exchange heat with hot liquid inside in outer cooling tube, to substantially increase the efficiency of heat exchange；The filter being arranged in the present invention can be filtered hot liquid, enter in outer cooling tube and result in blockage so as to avoid impurity, to improve the effect of heat exchange for a long time.
Description
Technical field
The present invention relates to water pump technology, in particular to a kind of heat exchange type water pump.
Background technique
Water pump is the machinery for conveying liquid or being pressurized liquid；It transmits the mechanical energy of prime mover or other external energies
To liquid, increase liquid energy, is mainly used to convey liquid to include water, oil, acid & alkali liquid, emulsion, suspended emulsion and liquid gold
Belong to etc.；Also liquid, admixture of gas and the liquid containing suspended solids be can transport；And existing heat exchange type water pump heat exchange efficiency
It is relatively low, to seriously affect the effect used.
Summary of the invention
The object of the invention is that providing a kind of heat exchange type water pump to solve the above-mentioned problems, solve existing change
Hot type water pump heat exchange efficiency is relatively low, thus the problem of having seriously affected the effect used.
To solve the above-mentioned problems, the present invention provides a kind of technical solutions: a kind of heat exchange type water pump, innovative point exist
In: including shell, impeller one, pump chamber one, input hole one, cold liquid input adapter, top cover, sealing ring one, motor cavity, motor, heat
Liquid input adapter, input hole two, pump chamber two, impeller two, sealing ring two, outlet two, filter, side cover and heat exchanging chamber；The pump
Chamber one is located inside shell upper left side, and input hole one is equipped on the upside of the pump chamber one；It is fixed at one upper inlet of input hole
It is connected with cold liquid input adapter；The motor cavity is located inside shell central upper, is fixedly connected with electricity inside the motor cavity
Machine, motor cavity upside opening are fixedly connected with top cover；The pump chamber two is located inside shell upper right side, the pump chamber two
Upside is equipped with input hole two, is equipped with outlet two on the downside of the pump chamber two；Heat is fixedly connected at two upper inlet of input hole
Liquid input adapter；The impeller one is movably connected in pump chamber one, and one right center of impeller is fixedly connected on the left of motor
On output shaft end；The impeller two is movably connected in pump chamber two, and two Left-side center of impeller is fixedly connected on the right side of motor
On output shaft end；Sealing ring one, the motor right side are equipped on the left of the motor between output shaft outside and motor cavity left hole
Sealing ring two is equipped with outside output shaft between the motor cavity right ports；The heat exchanging chamber is located at shell lower inner part；It is described
Filter is fixedly connected in heat exchanging chamber upper right side by side cover, and the filter upside liquid inlet of stating is connected with outlet two.
Preferably, further including that outer cooling tube, interior cooling tube, lower clapboard, intercommunicating pore, liquid collecting channel, link block, cold liquid are defeated
Connector, connecting tube, hydrothermal solution out splice going splice, anchor tip, regulating valve, outlet one and upper spacer out；If the interior cooling tube passes through
A dry link block is fixedly connected with the upper right side phase inside outer cooling tube center of inside, the interior cooling tube right-side outlet and heat exchanging chamber
Connection；It is described to be connected in outer cooling tube upper right side entrance with filter lower left side liquid outlet；The liquid collecting channel is located at heat exchange
On the downside of chamber, the liquid collecting channel passes through intercommunicating pore and heat exchange in shell lower inner part, liquid collecting channel upper right side is laterally located at
Chamber lower right side is connected；The lower clapboard be it is several, the lower clapboard is fixedly connected in heat exchanging chamber in transversely arranged and bottom
On bottom surface；The cold liquid out splice going splice is fixedly connected at the left side outlet of liquid collecting channel；The outlet one is located at one downside of pump chamber,
Anchor tip is fixedly connected at one underside outlet of the outlet；It is external on the downside of the anchor tip to be opened with outer cooling tube upper left side
Mouth is fixedly connected, and is connected inside the anchor tip with interior cooling tube upper left side entrance；The connecting tube left hand external is fixed
It is connected in heat exchanging chamber upper left side, the connecting tube right hand inlet port is connected with outer cooling tube upper left side outlet, the connecting tube
Hydrothermal solution out splice going splice is fixedly connected at left side outlet；The regulating valve is fixedly connected in shell upper left side, the regulating valve
It is connected on the downside of right hand inlet port and pump chamber one, the regulating valve underside outlet is connected with heat exchanging chamber upper left side；The upper spacer
To be several, the upper spacer is fixedly connected on heat exchanging chamber top surface in transversely arranged and top.
Preferably, the top cover and side cover are sealing cover.
Preferably, the motor is Dual-output shaft motor.
Preferably, the filter specific structure includes outer case, filter chamber, framework, fixed lid, filter screen, goes out liquid
Mouth and liquid inlet；Filter chamber is equipped with inside the outer case；The filter chamber upper left side is equipped with liquid inlet, the filter chamber lower-left
Side is equipped with liquid outlet；The framework is fixedly connected on inside filter chamber by fixed lid, is fixedly connected with inside the framework
Strainer.
Preferably, the filter screen is obliquely installed in right low left high.
Preferably, being arranged between the partition and upper spacer in interlocking.
Preferably, the outer cooling tube and the serpentine-like setting of interior cooling tube.
Preferably, the regulating valve is flow control valve.
Beneficial effects of the present invention:
(1) present invention have it is structurally reasonable it is simple, production cost is low, easy for installation, multiple functional, the motor of setting can
Impeller one and impeller two rotate together simultaneously, so as to ensure cold liquid such as hot liquid flow, to improve
The effect of heat exchange.
(2) the cold liquid in the present invention in heat exchanging chamber can exchange heat with hot liquid outside in outer cooling tube, while interior
Cooling tube can exchange heat with hot liquid inside in outer cooling tube, to substantially increase the efficiency of heat exchange.
(3) filter being arranged in the present invention, can be filtered hot liquid, enter so as to avoid impurity outer cold
But it results in blockage in pipe, to improve the effect of heat exchange for a long time.
Detailed description of the invention
Detailed description will be given by the following detailed implementation and drawings by the present invention for ease of explanation,.
Fig. 1 is the structural diagram of the present invention.
Fig. 2 is local connection figure of the invention.
Fig. 3 is the structural schematic diagram of filter.
1- shell；2- impeller one；3- pump chamber one；4- input hole one；The cold liquid input adapter of 5-；6- top cover；7- sealing ring one；
8- motor cavity；9- motor；10- hydrothermal solution input adapter；11- input hole two；12- pump chamber two；13- impeller two；14- sealing ring two；
The outlet 15- two；16- filter；17- side cover；18- heat exchanging chamber；The outer cooling tube of 19-；Cooling tube in 20-；21- lower clapboard；22- connects
Through-hole；23- liquid collecting channel；24- link block；The cold liquid out splice going splice of 25-；26- connecting tube；27- hydrothermal solution out splice going splice；28- is fixed
Connector；29- regulating valve；The outlet 30- one；31- upper spacer；161- outer case；162- filter chamber；163- framework；The fixed lid of 164-；
165- filter screen；166- liquid outlet；167- liquid inlet.
Specific embodiment
As depicted in figs. 1 and 2, present embodiment uses following technical scheme: a kind of heat exchange type water pump, including shell
1, impeller 1, pump chamber 1, input hole 1, cold liquid input adapter 5, top cover 6, sealing ring 1, motor cavity 8, motor 9, hydrothermal solution
Input adapter 10, input hole 2 11, pump chamber 2 12, impeller 2 13, sealing ring 2 14, outlet 2 15, filter 16,17 and of side cover
Heat exchanging chamber 18；The pump chamber 1 is located inside 1 upper left side of shell, and one 3 upside of pump chamber is equipped with input hole 1；The input
Cold liquid input adapter 5 is fixedly connected at one 4 upper inlet of hole；The motor cavity 8 is located inside 1 central upper of shell, described
Motor 9 is fixedly connected with inside motor cavity 8, the 8 upside opening of motor cavity is fixedly connected with top cover 6；The pump chamber 2 12
It is located inside 1 upper right side of shell, 2 12 upside of pump chamber is equipped with input hole 2 11, and 2 12 downside of pump chamber is equipped with outlet two
15；Hydrothermal solution input adapter 10 is fixedly connected at 2 11 upper inlet of input hole；The impeller 1 is movably connected in pump chamber
In one 3, one 2 right center of impeller is fixedly connected on 9 left side output shaft end of motor；The impeller 2 13 is movably connected in
In pump chamber 2 12,2 13 Left-side center of impeller is fixedly connected on 9 right side output shaft end of motor；9 left side of motor is defeated
Sealing ring 1, the 9 right side output shaft outside of motor and the motor cavity 8 are equipped between shaft outside and 8 left hole of motor cavity
Sealing ring 2 14 is equipped between right ports；The heat exchanging chamber 18 is located at 1 lower inner part of shell；The filter 16 passes through side cover 17
It is fixedly connected in 18 upper right side of heat exchanging chamber, the 16 upside liquid inlet of filter of stating is connected with outlet 2 15.
It wherein, further include outer cooling tube 19, interior cooling tube 20, lower clapboard 21, intercommunicating pore 22, liquid collecting channel 23, link block
24, cold liquid out splice going splice 25, connecting tube 26, hydrothermal solution out splice going splice 27, anchor tip 28, regulating valve 29, outlet 1 and on every
Plate 31；The interior cooling tube 20 is fixedly connected by several link blocks 24 in outer 19 center of inside of cooling tube, the interior cooling
20 right-side outlet of pipe is connected with 18 inside upper right side of heat exchanging chamber；It is described left in outer 19 upper right side entrance of cooling tube and filter 16
Downside liquid outlet is connected；The liquid collecting channel 23 is located at 18 downside of heat exchanging chamber, and the liquid collecting channel 23 is located at shell 1 in lateral
Lower inner part, 23 upper right side of liquid collecting channel are connected by intercommunicating pore 22 with 18 lower right side of heat exchanging chamber；The lower clapboard 21
To be several, the lower clapboard 21 is fixedly connected on 18 bottom surface of heat exchanging chamber in transversely arranged and bottom；The cold liquid output connects
First 25 are fixedly connected at 23 left side outlet of liquid collecting channel；The outlet 1 is located at one 3 downside of pump chamber, under the outlet 1
Anchor tip 28 is fixedly connected at side outlet；28 downside of anchor tip is external to be fixed with outer 19 upper left side opening of cooling tube
Connection, 28 inside of anchor tip are connected with interior 20 upper left side entrance of cooling tube；26 left hand external of connecting tube is fixed
It is connected in 18 upper left side of heat exchanging chamber, 26 right hand inlet port of connecting tube is connected with outer 19 upper left side outlet of cooling tube, described
Hydrothermal solution out splice going splice 27 is fixedly connected at 26 left side outlet of connecting tube；The regulating valve 29 is fixedly connected on 1 upper left side of shell
In, 29 right hand inlet port of regulating valve is connected with one 3 downside of pump chamber, 29 underside outlet of regulating valve and 18 upper left of heat exchanging chamber
Side is connected；The upper spacer 31 be it is several, the upper spacer 31 is fixedly connected in heat exchanging chamber 18 in transversely arranged and top
On top surface.
Wherein, the top cover 6 and side cover 17 are sealing cover；The motor 9 is Dual-output shaft motor.
As shown in figure 3,16 specific structure of filter includes outer case 161, filter chamber 162, framework 163, fixed lid
164, filter screen 165, liquid outlet 166 and liquid inlet 167；Filter chamber 162 is equipped with inside the outer case 161；The filter chamber
162 upper left sides are equipped with liquid inlet 167, and 162 lower left side of filter chamber is equipped with liquid outlet 166；The framework 163 passes through fixed lid
164 are fixedly connected on inside filter chamber 162, are fixedly connected with filter screen 165 inside the framework 163.
Wherein, the filter screen 165 is obliquely installed in right low left high；It is in staggered row between the partition 21 and upper spacer 31
Column setting；The outer cooling tube 19 and the serpentine-like setting of interior cooling tube 20；The regulating valve 29 is flow control valve.
Use state of the invention are as follows: the present invention have it is structurally reasonable it is simple, production cost is low, easy for installation, function is neat
Entirely, it is rotated in use, being powered first to motor 9, and then impeller 1 and impeller 2 13 revolve together simultaneously for the rotation of motor 9
Turn, impeller 1 here can distinguish liquid cold in cold liquid input adapter 5 defeated to 18 inside of heat exchanging chamber and interior cooling tube 20
In, while hot liquid can be transported to inside outer cooling tube 19 by impeller 2 13, and the cold liquid in heat exchanging chamber 18 can be with here
It exchanges heat on the outside of hot liquid in outer cooling tube 19, while interior cooling tube 20 can be with progress on the inside of hot liquid in outer cooling tube 19
Heat exchange, to substantially increase the efficiency of heat exchange, impeller 1 and impeller 2 13 in addition here is worked at the same time, so as to true
Cold insulation liquid is such as hot liquid flow, to further improve the effect of heat exchange, filter 16 set in addition can
Hot liquid is filtered, enters in outer cooling tube 19 and results in blockage so as to avoid impurity, is changed for a long time to improve
The effect of heat.
In the description of the present invention, it is to be understood that, term " coaxial ", " bottom ", " one end ", " top ", " middle part ",
The orientation or positional relationship of the instructions such as " other end ", "upper", " side ", " top ", "inner", " front ", " center ", " both ends " is
It is based on the orientation or positional relationship shown in the drawings, is merely for convenience of description of the present invention and simplification of the description, rather than instruction or dark
Show that signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as pair
Limitation of the invention.
In the present invention unless specifically defined or limited otherwise, term " installation ", " setting ", " connection ", " fixation ",
Terms such as " being screwed on " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be with
It is mechanical connection, is also possible to be electrically connected；It can be directly connected, two can also be can be indirectly connected through an intermediary
The interaction relationship of connection or two elements inside a element, unless otherwise restricted clearly, for the common of this field
For technical staff, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention, the technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes
Change and improvement all fall within the protetion scope of the claimed invention, the claimed scope of the invention by appended claims and its
Equivalent thereof.
Claims (9)
1. a kind of heat exchange type water pump, it is characterised in that: including shell (1), impeller one (2), pump chamber one (3), input hole one (4),
Cold liquid input adapter (5), top cover (6), sealing ring one (7), motor cavity (8), motor (9), hydrothermal solution input adapter (10), input hole
Two (11), impeller two (13), sealing ring two (14), export two (15), filter (16), side cover (17) and change pump chamber two (12)
Hot chamber (18)；
The pump chamber one (3) is located inside shell (1) upper left side, and input hole one (4) is equipped on the upside of the pump chamber one (3)；
Cold liquid input adapter (5) is fixedly connected at input hole one (4) upper inlet；
The motor cavity (8) is located inside shell (1) central upper, is fixedly connected with motor (9) inside the motor cavity (8),
Opening is fixedly connected with top cover (6) on the upside of the motor cavity (8)；
The pump chamber two (12) is located inside shell (1) upper right side, and input hole two (11), institute are equipped on the upside of the pump chamber two (12)
It states and is equipped with two (15) of outlet on the downside of pump chamber two (12)；
Hydrothermal solution input adapter (10) are fixedly connected at input hole two (11) upper inlet；
The impeller one (2) is movably connected in pump chamber one (3), and impeller one (2) right center is fixedly connected on motor (9)
On the output shaft end of left side；
The impeller two (13) is movably connected in pump chamber two (12), and impeller two (13) Left-side center is fixedly connected on motor
(9) on the output shaft end of right side；
It is equipped with sealing ring one (7), the motor (9) on the left of the motor (9) outside output shaft between motor cavity (8) left hole
Sealing ring two (14) is equipped with outside the output shaft of right side between the motor cavity (8) right ports；
The heat exchanging chamber (18) is located at shell (1) lower inner part；
The filter (16) is fixedly connected in heat exchanging chamber (18) upper right side by side cover (17), described to state on filter (16)
Side liquid inlet is connected with two (15) of outlet.
2. a kind of heat exchange type water pump according to claim 1, it is characterised in that: further include outer cooling tube (19), interior cooling
Manage (20), lower clapboard (21), intercommunicating pore (22), liquid collecting channel (23), link block (24), cold liquid out splice going splice (25), connecting tube
(26), hydrothermal solution out splice going splice (27), anchor tip (28), regulating valve (29), one (30) of outlet and upper spacer (31)；
The interior cooling tube (20) is fixedly connected by several link blocks (24) in outer cooling tube (19) center of inside, it is described in
Cooling tube (20) right-side outlet is connected with the internal upper right side of heat exchanging chamber (18)；
It is described to be connected in outer cooling tube (19) upper right side entrance with filter (16) lower left side liquid outlet；
The liquid collecting channel (23) is located on the downside of heat exchanging chamber (18), and the liquid collecting channel (23) is located on the downside of shell (1) in lateral
Inside, liquid collecting channel (23) upper right side are connected by intercommunicating pore (22) with heat exchanging chamber (18) lower right side；
The lower clapboard (21) be it is several, the lower clapboard (21) is fixedly connected in heat exchanging chamber (18) in transversely arranged and bottom
On bottom surface；
The cold liquid out splice going splice (25) is fixedly connected at liquid collecting channel (23) left side outlet；
One (30) of the outlet are located on the downside of pump chamber one (3), and fixation is fixedly connected at one (30) underside outlet of the outlet and is connect
Head (28)；
It is external on the downside of the anchor tip (28) to be fixedly connected with outer cooling tube (19) upper left side opening, the anchor tip (28)
It is internal to be connected with interior cooling tube (20) upper left side entrance；
Connecting tube (26) left hand external is fixedly connected in heat exchanging chamber (18) upper left side, connecting tube (26) right hand inlet port
It is connected with outer cooling tube (19) upper left side outlet, is fixedly connected with hydrothermal solution out splice going splice at connecting tube (26) left side outlet
(27)；
The regulating valve (29) is fixedly connected in shell (1) upper left side, regulating valve (29) right hand inlet port and pump chamber one (3)
Downside is connected, and regulating valve (29) underside outlet is connected with heat exchanging chamber (18) upper left side；
The upper spacer (31) be it is several, the upper spacer (31) is fixedly connected in heat exchanging chamber (18) in transversely arranged and top
On top surface.
3. a kind of heat exchange type water pump according to claim 1, it is characterised in that: the top cover (6) and side cover (17) are
Sealing cover.
4. a kind of heat exchange type water pump according to claim 1, it is characterised in that: the motor (9) is Dual-output shaft motor.
5. a kind of heat exchange type water pump according to claim 1, it is characterised in that: filter (16) specific structure includes
Outer case (161), filter chamber (162), framework (163), fixed lid (164), filter screen (165), liquid outlet (166) and liquid inlet
(167)；
Filter chamber (162) are equipped with inside the outer case (161)；
Filter chamber (162) upper left side is equipped with liquid inlet (167), and filter chamber (162) lower left side is equipped with liquid outlet
(166)；
The framework (163) is fixedly connected on filter chamber (162) inside by fixed lid (164), and the framework (163) is internal solid
Surely filter screen (165) are connected with.
6. a kind of heat exchange type water pump according to claim 5, it is characterised in that: the filter screen (165) is in right low left high
It is obliquely installed.
7. a kind of heat exchange type water pump according to claim 2, it is characterised in that: the partition (21) and upper spacer (31) it
Between in staggeredly be arranged.
8. a kind of heat exchange type water pump according to claim 2, it is characterised in that: the outer cooling tube (19) and interior cooling tube
(20) serpentine-like setting.
9. a kind of heat exchange type water pump according to claim 2, it is characterised in that: the regulating valve (29) is flow adjusting
Valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910290221.XA CN109931271B (en) | 2019-04-11 | 2019-04-11 | Heat exchange type water pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910290221.XA CN109931271B (en) | 2019-04-11 | 2019-04-11 | Heat exchange type water pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109931271A true CN109931271A (en) | 2019-06-25 |
| CN109931271B CN109931271B (en) | 2020-12-18 |
Family
ID=66989724
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910290221.XA Active CN109931271B (en) | 2019-04-11 | 2019-04-11 | Heat exchange type water pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109931271B (en) |
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| CN1619155A (en) * | 2003-11-18 | 2005-05-25 | 现代自动车株式会社 | Electric twin flow pump apparatus |
| JP2008057908A (en) * | 2006-09-01 | 2008-03-13 | Matsushita Electric Ind Co Ltd | Heat exchanger |
| CN202648471U (en) * | 2012-06-12 | 2013-01-02 | 成都蜀都纳米材料科技发展有限公司 | Improved heat exchanger |
| CN103225926A (en) * | 2010-04-05 | 2013-07-31 | 株式会社电装 | Evaporator unit |
| CN205331005U (en) * | 2015-12-24 | 2016-06-22 | 天津凡易石油科技有限公司 | Electronic oil pump of diving of gear formula |
| CN206944765U (en) * | 2017-04-26 | 2018-01-30 | 福建省东南电化股份有限公司 | A kind of device of raising TDI Isomer ratios |
| CN207214858U (en) * | 2017-09-21 | 2018-04-10 | 湖北和远气体股份有限公司 | Purifier, which regenerates and blows cold process waste heat, in a kind of space division system utilizes system |
| CN207816020U (en) * | 2017-12-13 | 2018-09-04 | 龙南县生产力促进中心 | A kind of condensation pipe used in experiments of chemical engineering |
-
2019
- 2019-04-11 CN CN201910290221.XA patent/CN109931271B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1619155A (en) * | 2003-11-18 | 2005-05-25 | 现代自动车株式会社 | Electric twin flow pump apparatus |
| JP2008057908A (en) * | 2006-09-01 | 2008-03-13 | Matsushita Electric Ind Co Ltd | Heat exchanger |
| CN103225926A (en) * | 2010-04-05 | 2013-07-31 | 株式会社电装 | Evaporator unit |
| CN202648471U (en) * | 2012-06-12 | 2013-01-02 | 成都蜀都纳米材料科技发展有限公司 | Improved heat exchanger |
| CN205331005U (en) * | 2015-12-24 | 2016-06-22 | 天津凡易石油科技有限公司 | Electronic oil pump of diving of gear formula |
| CN206944765U (en) * | 2017-04-26 | 2018-01-30 | 福建省东南电化股份有限公司 | A kind of device of raising TDI Isomer ratios |
| CN207214858U (en) * | 2017-09-21 | 2018-04-10 | 湖北和远气体股份有限公司 | Purifier, which regenerates and blows cold process waste heat, in a kind of space division system utilizes system |
| CN207816020U (en) * | 2017-12-13 | 2018-09-04 | 龙南县生产力促进中心 | A kind of condensation pipe used in experiments of chemical engineering |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109931271B (en) | 2020-12-18 |
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