CN102563872B - Water tank, heat pump water heater comprising water tank and control method of heat pump water heater - Google Patents
Water tank, heat pump water heater comprising water tank and control method of heat pump water heater Download PDFInfo
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- CN102563872B CN102563872B CN201110425758.6A CN201110425758A CN102563872B CN 102563872 B CN102563872 B CN 102563872B CN 201110425758 A CN201110425758 A CN 201110425758A CN 102563872 B CN102563872 B CN 102563872B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 215
- 238000000034 method Methods 0.000 title claims abstract description 10
- 238000010438 heat treatment Methods 0.000 claims description 14
- 230000000740 bleeding effect Effects 0.000 claims description 5
- 239000003507 refrigerant Substances 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 3
- BGOFCVIGEYGEOF-UJPOAAIJSA-N helicin Chemical compound O[C@@H]1[C@@H](O)[C@H](O)[C@@H](CO)O[C@H]1OC1=CC=CC=C1C=O BGOFCVIGEYGEOF-UJPOAAIJSA-N 0.000 description 3
- 230000001174 ascending effect Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
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Abstract
The utility model provides a water tank and contain heat pump water heater of this water tank and control method, heat pump water heater, including the compressor, the four-way valve, air side heat exchanger, choke valve and above-mentioned water tank, the compressor passes through the blast pipe and connects with the third interface of four-way valve, the compressor passes through the muffler and connects with the first interface of four-way valve, the fourth interface of four-way valve is connected with the one end of air side heat exchanger, the other end of air side heat exchanger passes through the bottom of refrigerant exit tube and the heat transfer unit of water tank behind the choke valve and meets, the second interface of four-way valve passes through the refrigerant admission pipe, the top of distributor and the heat. A water flow switch is arranged on the water inlet pipe; and a third temperature sensor is arranged on the air side heat exchanger. The invention has the characteristics of simple and reasonable structure, flexible operation, high energy efficiency ratio, capability of rapidly providing hot water and wide application range.
Description
Technical field
The heat pump water-heating machine and the control method thereof that the present invention relates to a kind of water tank and comprise this water tank.
Background technology
At present, for the water tank of heat pump water-heating machine all at the future development towards small size, for needs realize fast hot merit can Teat pump boiler, require water tank simultaneously as heat exchange with and water storage use.
Chinese patent literature CN 101936603A discloses a kind of control method and water heater thereof of Split instant-heating heat pump water heater for 01 month on the 05th in 2011, water heater, comprise the Teat pump boiler main frame interconnecting and be communicated with, boiler and control device, be arranged in boiler by the condenser of pipeline connection with main frame, boiler is connected with high-power main frame, the power of main frame is 1.5～3, and on main frame, is furnished with environment temperature sensor, be provided with middle part cooling-water temperature sensor at the middle part of boiler, bottom is provided with bottom water temperature sensor, the shell of boiler is provided with the display screen that shows water temperature and water level, and each sensor and display screen are electrically connected with control device.Boiler is horizontal boiler, and the volume of horizontal boiler is 35～70L.
Summary of the invention
Object of the present invention aim to provide a kind of simple and reasonable, flexible operation, Energy Efficiency Ratio high, can provide rapidly hot water, water tank and the heat pump water-heating machine that comprises this water tank and control method thereof applied widely, to overcome weak point of the prior art.
By a kind of water tank of this object design, comprise the heat exchange unit being arranged in housing, its architectural feature is that housing comprises water tank urceolus and water tank inner core, water tank urceolus and water tank inner core surround annular chamber jointly, heat exchange unit is arranged in annular chamber, and water inlet pipe communicates with the bottom of annular chamber, and water tank inner core is hollow structure, the top of annular chamber communicates with the inner chamber of water tank inner core, and outlet pipe communicates with the bottom of the inner chamber of water tank inner core.
Described heat exchange unit is coiled in annular chamber in the shape of a spiral.
In described annular chamber, be provided with the diaphragm of arranging in the shape of a spiral, heat exchange unit is coiled between diaphragm.
Described electric heater is arranged in the inner chamber of water tank inner core.
The top of described heat exchange unit joins by distributor and cold-producing medium inlet pipe, and the bottom of heat exchange unit and cold-producing medium go out pipe and join.
The top of described water tank is provided with the first temperature sensor and air bleeding valve, and the middle part of water tank is provided with the second temperature sensor; Moisture storage capacity >=the 25L of water tank.
Described heat exchange unit comprises outer heat exchange unit in parallel, intermediate layer heat exchange unit and internal layer heat exchange unit, outer heat exchange unit is near water tank urceolus, internal layer heat exchange unit is near water tank inner core, and intermediate layer heat exchange unit is between outer heat exchange unit and internal layer heat exchange unit; Outer heat exchange unit, intermediate layer heat exchange unit and internal layer heat exchange unit are and are distributed on one heart in annular chamber with the axle center of water tank inner core.
A kind of heat pump water-heating machine, comprise compressor, cross valve, air-side heat exchanger, choke valve and above-mentioned water tank, its architectural feature is that compressor joins by the 3rd interface of blast pipe and cross valve, compressor joins by the first interface of muffler and cross valve, the 4th interface of cross valve and one end of air-side heat exchanger join, the other end of air-side heat exchanger is through going out the bottom connection of the heat exchange unit of pipe and water tank by cold-producing medium after choke valve, the second interface of cross valve joins by the top of the heat exchange unit of cold-producing medium inlet pipe, distributor and water tank.
On described water inlet pipe, be provided with water flow switch; On air-side heat exchanger, be provided with three-temperature sensor.
A control method for heat pump water-heating machine, is characterized in that comprising the following steps:
First, power on for the first time, compressor and electric heater are worked simultaneously, when detecting that by the second temperature sensor that is arranged on water tank middle part the water temperature in water tank reaches after setting value Tset, the signal detecting by water flow switch judges user's the hot water demand that uses, if when user does not use hot water demand, compressor and electric heater quit work; If when the useful hot water demand of user, compressor works on, electric heater quits work;
Second, non-ly power on for the first time, if when the useful hot water demand of user detected, in the time of water temperature T 10≤Tset+ Δ T in the water tank detecting by the second temperature sensor that is arranged on water tank middle part, compressor and electric heater are opened work simultaneously, after 5 minutes, electric heater quits work, and in the time detecting that user does not use hot water demand and while T10 > Tset+ Δ T, compressor quits work; Wherein, the water temperature that T10 is water tank, Δ T is the temperature return difference of compressor and electric heater work; The span of Δ T is 0～5 DEG C;
The 3rd, holding state, now user does not use hot water demand, in the time of water temperature T 10≤Tset-Δ T in the water tank detecting by the second temperature sensor that is arranged on water tank middle part, compressor unlatching work, until compressor just quits work after T10 > Tset+ Δ T being detected;
The 4th, defrost state, when being less than for 30 minutes, the coil temperature T17 of the air-side heat exchanger detecting by the three-temperature sensor on air-side heat exchanger accumulative total sets defrost temperature T defrost, after being T17 < Tdefrost, electric heater unlatching work, entered defrost after 10 minutes, exited defrost a period of time Δ τ after 2 minutes, electric heater quits work, and compressor works on; Wherein, the coil temperature that T17 is air-side heat exchanger, Δ τ 2 is the electric heater time-delay closing time;
The 5th, in the time that the electric heater in the inner chamber that is arranged on water tank inner core is worked, if when being arranged on water temperature that first temperature sensor at top of water tank detects higher than 85 DEG C, no matter now whether there is the start work requirements of electric heater, electric heater all quits work and enters guard mode, to ensure that the water in water tank can not gasify, protection water tank; If electric heater enters after guard mode because of the water temperature over-high that is arranged on first temperature sensor at top of water tank and detects; the reduction of the water temperature detecting along with this first temperature sensor, opening electric heater work according to demand after water temperature is lower than 75 DEG C.
The present invention adopts after above-mentioned technical scheme, can effectively improve the heat exchange efficiency of water tank, and water tank has water storage function; And power on for the first time in order to realize speed heat, to have provided, non-ly power on for the first time, control method under holding state and defrost state, to guarantee that user can obtain hot water in time.
The present invention is the helically wound heat exchange unit of heat-exchange tube of each branch road of walking cold-producing medium, on heat exchange unit according to certain pitch arrangement diaphragm, to allow the water of flowing through outside heat-exchange tube by the almost vertical direction heat exchange unit of flowing through; Heat exchange unit, comprise outer heat exchange unit, intermediate layer heat exchange unit and internal layer heat exchange unit, there is identical axle center and be evenly arranged in water tank inner core and water tank urceolus between annular chamber in, by the parallel connection of multiple spiral helicine heat exchange units, can reduce the contact area of drag losses, increase cold-producing medium and the water of cold-producing medium, improve heat exchange amount, finally realize the object of high efficient heat exchanging and stored hot water.
The present invention is joined the top of heat exchange unit by distributor and cold-producing medium inlet pipe, the bottom of heat exchange unit and cold-producing medium go out pipe and join, cold-producing medium can be distributed to each heat exchange unit equably, make full use of the heat exchange area of heat exchange unit, and, water outlet place is positioned at same position with refrigerant inlet, can further realize high efficient heat exchanging.
That the present invention has is simple and reasonable, flexible operation, Energy Efficiency Ratio are high, hot water can be provided rapidly, feature applied widely.
Brief description of the drawings
Fig. 1 is the broken section structural representation of the water tank in one embodiment of the invention.
Fig. 2 be Fig. 1 remove the first temperature sensor and air bleeding valve after plan structure schematic diagram.
Fig. 3 is the structural representation of internal layer heat exchange unit.
Fig. 4 is the water (flow) direction schematic diagram in water tank.
Fig. 5 is application examples schematic diagram of the present invention.
In figure: 1 is compressor, 2 is blast pipe, 3 is cross valve, 4 is air-side heat exchanger, 5 is muffler, 6 is choke valve, 7 for cold-producing medium go out pipe, 8 is water tank, 9 is electric heater, 10 is the first temperature sensor, 11 is air bleeding valve, 12 is cold-producing medium inlet pipe, 13 is the second temperature sensor, 14 is water inlet pipe, 15 is outlet pipe, 16 is water flow switch, 17 is three-temperature sensor, 801 for distributing intermediate connection tube, 802 is distributor, 803 is outer heat exchange unit, 804 is intermediate layer heat exchange unit, 805 is internal layer heat exchange unit, 806 is water tank urceolus, 807 is diaphragm, 808 is spherical water tank top, 809 is intermediate connection tube, 810 is distributor, 811 is water tank inner core.
Detailed description of the invention
Below in conjunction with drawings and Examples, the invention will be further described.
Referring to Fig. 1-Fig. 5, this water tank 8, comprise the heat exchange unit being arranged in housing, housing comprises water tank urceolus 806 and water tank inner core 811, and water tank urceolus 806 and water tank inner core 811 surround annular chamber jointly, and heat exchange unit is arranged in annular chamber, water inlet pipe 14 communicates with the bottom of annular chamber, water tank inner core 811 is hollow structure, and the top of annular chamber communicates with the inner chamber of water tank inner core 811, and outlet pipe 15 communicates with the bottom of the inner chamber of water tank inner core 811.Heat exchange unit is coiled in annular chamber in the shape of a spiral.Electric heater 9 is arranged in the inner chamber of water tank inner core 811.
In annular chamber, be provided with the diaphragm 807 of arranging in the shape of a spiral, heat exchange unit is coiled between diaphragm 807.The top of heat exchange unit joins by distributor 810 and cold-producing medium inlet pipe 12, and the bottom of heat exchange unit and cold-producing medium go out pipe 7 and join.
The top of water tank 8 is provided with the first temperature sensor 10 and air bleeding valve 11, and the middle part of water tank is provided with the second temperature sensor 13.For realizing the water storage function of water tank, require the volume of this water tank can meet the hot water demand of 5 minutes, the moisture storage capacity >=25L of water tank.
In the present embodiment, heat exchange unit comprises outer heat exchange unit 803 in parallel, intermediate layer heat exchange unit 804 and internal layer heat exchange unit 805, outer heat exchange unit 803 is near water tank urceolus 806, internal layer heat exchange unit 805 is near water tank inner core 811, and intermediate layer heat exchange unit 804 is between outer heat exchange unit 803 and internal layer heat exchange unit 805; Outer heat exchange unit 803, intermediate layer heat exchange unit 804 and internal layer heat exchange unit 805 are and are distributed on one heart in annular chamber with the axle center of water tank inner core 811.
Uniform several diaphragms 807 on outer heat exchange unit 803, intermediate layer heat exchange unit 804 and internal layer heat exchange unit 805, the current that entered in the annular chamber of water tank by water inlet pipe 14 are like this rendered as spiral helicine ascending motion, as shown in Figure 4, instead of between straight-through water tank urceolus 806 and inner core 811; This spiral helicine rising of current is flowed, and has increased the contact area of current and outer heat exchange unit 803, intermediate layer heat exchange unit 804 and internal layer heat exchange unit 805, and can realize homogeneous heating, promotes the efficiency of heating surface.
Heat pump water-heating machine in the present embodiment, comprise compressor 1, cross valve 3, air-side heat exchanger 4, choke valve 6 and above-mentioned water tank 8, compressor 1 joins with the 3rd interface d of cross valve 3 by blast pipe 2, compressor 1 joins with the first interface s of cross valve 3 by muffler 5, the 4th interface e of cross valve 3 and one end of air-side heat exchanger 4 join, the other end of air-side heat exchanger 4 is through going out the bottom connection of the heat exchange unit of pipe 7 and water tank 8 by cold-producing medium after choke valve 6, the second interface c of cross valve 3 is by cold-producing medium inlet pipe 12, distributor 810 joins with the top of the heat exchange unit of water tank 8.On water inlet pipe 14, be provided with water flow switch 16; On air-side heat exchanger 4, be provided with three-temperature sensor 17.
The control method of the heat pump water-heating machine in the present embodiment, comprises the following steps:
First, power on for the first time, compressor 1 and electric heater 9 are worked simultaneously, when detecting that by the second temperature sensor 13 that is arranged on water tank 8 middle parts the water temperature in water tank 8 reaches after setting value Tset, the signal detecting by water flow switch 16 judges user's the hot water demand that uses, if when user does not use hot water demand, compressor 1 and electric heater 9 quit work; If when the useful hot water demand of user, compressor 1 works on, and electric heater 9 quits work.
Second, non-ly power on for the first time, if when the useful hot water demand of user detected, in the time of water temperature T 10≤Tset+ Δ T in the water tank 8 detecting by the second temperature sensor 13 that is arranged on water tank 8 middle parts, compressor 1 and electric heater 9 are opened work simultaneously, after 5 minutes, electric heater 9 quits work, and compressor works on.
In the time detecting that user does not use hot water demand and while T10 > Tset+ Δ T, compressor 1 quits work; Wherein, T10 is the water temperature of water tank 8, and Δ T is the temperature return difference that compressor 1 and electric heater 9 are worked; The span of Δ T is 0～5 DEG C.
Such as, the setting value Tset of water temperature is 50 DEG C, temperature return difference Δ T is taken as 3 DEG C.When detecting after compressor operating that the water temperature T 10 of water tank reaches after 53 DEG C, when user does not use hot water demand and while T10 > Tset+ Δ T, compressor quits work.At holding state, due to radiation loss, when water tank temperature drops to after 50-3=47 DEG C, compressor unlatching work, to ensure there is sufficient hot water in water tank, for user demand.
The 3rd, holding state, now user does not use hot water demand, in the time of water temperature T 10≤Tset-Δ T in the water tank 8 detecting by the second temperature sensor 13 that is arranged on water tank 8 middle parts, compressor 1 unlatching work, until compressor 1 just quits work after T10 > Tset+ Δ T being detected.At holding state, electric heater 9 is not worked always.
The 4th, defrost state, when being less than for 30 minutes, the coil temperature T17 of the air-side heat exchanger 4 detecting by the three-temperature sensor 17 on air-side heat exchanger 4 accumulative total sets defrost temperature T defrost, after being T17 < Tdefrost, electric heater 9 unlatching work, entered defrost after 10 minutes.In the above-mentioned stage, compressor 1 is worked always.
Exit defrost a period of time Δ τ after 2 minutes, electric heater 9 quits work, and compressor 1 works on; Wherein, T17 is the coil temperature of air-side heat exchanger 4, and Δ τ 2 is the 9 time-delay closing times of electric heater.
The 5th, in the time that the electric heater 9 in the inner chamber that is arranged on water tank inner core 811 is worked, if when being arranged on water temperature that first temperature sensor 10 at top of water tank 8 detects higher than 85 DEG C, no matter now whether there is the start work requirements of electric heater 9, electric heater 9 all quits work and enters guard mode, to ensure that the water in water tank 8 can not gasify, protection water tank; If electric heater 9 enters after guard mode because of the water temperature over-high that is arranged on first temperature sensor 10 at top of water tank 8 and detects; the reduction of the water temperature detecting along with this first temperature sensor 10, after water temperature is lower than 75 DEG C, opening electric heater 9 is worked according to demand.
Claims (9)
1. a water tank, comprise the heat exchange unit being arranged in housing, it is characterized in that housing comprises water tank urceolus (806) and water tank inner core (811), water tank urceolus (806) and water tank inner core (811) surround annular chamber jointly, heat exchange unit is arranged in annular chamber, water inlet pipe (14) communicates with the bottom of annular chamber, water tank inner core (811) is hollow structure, the top of annular chamber communicates with the inner chamber of water tank inner core (811), outlet pipe (15) communicates with the bottom of the inner chamber of water tank inner core (811), described heat exchange unit comprises outer heat exchange unit (803) in parallel, intermediate layer heat exchange unit (804) and internal layer heat exchange unit (805), outer heat exchange unit (803) is near water tank urceolus (806), internal layer heat exchange unit (805) is near water tank inner core (811), intermediate layer heat exchange unit (804) is positioned between outer heat exchange unit (803) and internal layer heat exchange unit (805), and outer heat exchange unit (803), intermediate layer heat exchange unit (804), internal layer heat exchange unit (805) is connected with distributor (810) by intermediate connection tube (809), in described annular chamber, be provided with the diaphragm (807) of arranging in the shape of a spiral, heat exchange unit is coiled between diaphragm (807).
2. water tank according to claim 1, is characterized in that described heat exchange unit is coiled in annular chamber in the shape of a spiral.
3. water tank according to claim 1, is characterized in that also comprising electric heater (9), and described electric heater (9) is arranged in the inner chamber of water tank inner core (811).
4. water tank according to claim 1, is characterized in that the top of described heat exchange unit joins by distributor (810) and cold-producing medium inlet pipe (12), and the bottom of heat exchange unit and cold-producing medium go out pipe (7) and join.
5. water tank according to claim 1, is characterized in that the top of described water tank is provided with the first temperature sensor (10) and air bleeding valve (11), and the middle part of water tank is provided with the second temperature sensor (13); Moisture storage capacity >=the 25L of water tank.
6. according to the arbitrary described water tank of claim 1 to 5, it is characterized in that described outer heat exchange unit (803), intermediate layer heat exchange unit (804) and internal layer heat exchange unit (805) are and are distributed on one heart in annular chamber with the axle center of water tank inner core (811).
7. a heat pump water-heating machine, comprise compressor (1), cross valve (3), air-side heat exchanger (4), choke valve (6) and water tank claimed in claim 1, it is characterized in that compressor (1) joins by blast pipe (2) and the 3rd interface (d) of cross valve (3), compressor (1) joins by muffler (5) and the first interface (s) of cross valve (3), the 4th interface (e) of cross valve (3) joins with one end of air-side heat exchanger (4), the other end of air-side heat exchanger (4) goes out the bottom connection of the heat exchange unit of pipe (7) and water tank afterwards by cold-producing medium through choke valve (6), second interface (c) of cross valve (3) is by cold-producing medium inlet pipe (12), distributor (810) joins with the top of the heat exchange unit of water tank.
8. heat pump water-heating machine according to claim 7, is characterized in that being provided with on described water inlet pipe (14) water flow switch (16); Air-side heat exchanger is provided with three-temperature sensor (17) on (4).
9. a control method for heat pump water-heating machine according to claim 8, is characterized in that comprising the following steps:
First, power on for the first time, compressor (1) and electric heater (9) are worked simultaneously, when detecting that by the second temperature sensor (13) that is arranged on water tank middle part the water temperature in water tank reaches after setting value Tset, the signal detecting by water flow switch (16) judges user's the hot water demand that uses, if when user does not use hot water demand, compressor (1) and electric heater (9) quit work; If when the useful hot water demand of user, compressor (1) works on, and electric heater (9) quits work;
Second, non-ly power on for the first time, if when the useful hot water demand of user detected, in the time of water temperature T 10≤Tset+ Δ T in the water tank that the second temperature sensor (13) by being arranged on water tank middle part detects, compressor (1) and electric heater (9) are opened work simultaneously, electric heater after 5 minutes (9) quits work, in the time detecting that user does not use hot water demand and while T10 > Tset+ Δ T, compressor (1) quits work; Wherein, the water temperature that T10 is water tank, Δ T is the temperature return difference of compressor (1) and electric heater (9) work; The span of Δ T is 0～5 DEG C;
The 3rd, holding state, now user does not use hot water demand, in the time of water temperature T 10≤Tset-Δ T in the water tank that the second temperature sensor (13) by being arranged on water tank middle part detects, compressor (1) unlatching work, until compressor (1) just quits work after T10 > Tset+ Δ T being detected;
The 4th, defrost state, when being less than for 30 minutes, the coil temperature T17 of the air-side heat exchanger (4) detecting by the three-temperature sensor (17) on air-side heat exchanger (4) accumulative total sets defrost temperature T defrost, after being T17 < Tdefrost, electric heater (9) unlatching work, after 10 minutes, enter defrost, exit defrost a period of time Δ τ after 2 minutes, electric heater (9) quits work, and compressor (1) works on; Wherein, T17 is the coil temperature of air-side heat exchanger (4), and Δ τ 2 is electric heater (9) the time-delay closing time;
The 5th, in the time that the electric heater in the inner chamber that is arranged on water tank inner core (811) (9) is worked, if when being arranged on water temperature that first temperature sensor (10) at top of water tank detects higher than 85 DEG C, no matter now whether there is the start work requirements of electric heater (9), electric heater (9) all quits work and enters guard mode, to ensure that the water in water tank can not gasify, protection water tank; If electric heater (9) enters after guard mode because of the water temperature over-high that is arranged on first temperature sensor (10) at top of water tank and detects; the reduction of the water temperature detecting along with this first temperature sensor (10), opening electric heater (9) work according to demand after water temperature is lower than 75 DEG C.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110425758.6A CN102563872B (en) | 2011-12-16 | 2011-12-16 | Water tank, heat pump water heater comprising water tank and control method of heat pump water heater |
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| CN201110425758.6A CN102563872B (en) | 2011-12-16 | 2011-12-16 | Water tank, heat pump water heater comprising water tank and control method of heat pump water heater |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105157225A (en) * | 2015-08-26 | 2015-12-16 | 珠海格力电器股份有限公司 | Heat pump water heater and control method thereof |
| CN105698382B (en) * | 2016-03-14 | 2018-03-30 | 广东美的制冷设备有限公司 | Teat pump boiler and its control method |
| CN110906553B (en) * | 2019-10-30 | 2021-12-10 | 广东纽恩泰新能源科技发展有限公司 | Quick heating water tank for air energy heat pump water heater |
| CN112303928B (en) * | 2020-10-30 | 2023-08-08 | 青岛海信日立空调系统有限公司 | Heat pump hot water unit and control method |
| CN114739013B (en) * | 2022-04-26 | 2023-11-14 | 浙江中广电器集团股份有限公司 | Variable frequency control method of heat pump water heater and variable frequency water heater system |
| CN117168009A (en) * | 2023-09-28 | 2023-12-05 | 中山市爱美泰电器有限公司 | Heat pump unit |
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| CN200972294Y (en) * | 2006-11-17 | 2007-11-07 | 陈则韶 | Wind heat pump with anti-frost heat exchange pipe |
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| CN200972294Y (en) * | 2006-11-17 | 2007-11-07 | 陈则韶 | Wind heat pump with anti-frost heat exchange pipe |
| CN201093892Y (en) * | 2007-06-15 | 2008-07-30 | 中山市爱美泰电器有限公司 | Mini shell-and-tube heat exchanger |
| CN201600061U (en) * | 2010-01-16 | 2010-10-06 | 韦发森 | Barrel-type heat exchanger |
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