CN202755354U - Temperature-maintaining pressure-maintaining system in concrete pouring process for spiral case of water turbine - Google Patents
Temperature-maintaining pressure-maintaining system in concrete pouring process for spiral case of water turbine Download PDFInfo
- Publication number
- CN202755354U CN202755354U CN2012204269140U CN201220426914U CN202755354U CN 202755354 U CN202755354 U CN 202755354U CN 2012204269140 U CN2012204269140 U CN 2012204269140U CN 201220426914 U CN201220426914 U CN 201220426914U CN 202755354 U CN202755354 U CN 202755354U
- Authority
- CN
- China
- Prior art keywords
- spiral case
- water
- pressure
- temperature
- high level
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
Links
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Abstract
The utility model discloses a temperature-maintaining pressure-maintaining system in a concrete pouring process for a spiral case of a water turbine. The temperature-maintaining pressure-maintaining system in the concrete pouring process for the spiral case of the water turbine comprises a pressure control device and a temperature control device, wherein the pressure control device is used for enabling the pressure in the spiral case to reach the specified pressure and maintaining the pressure, and the temperature control device is used for controlling the quantity of cold water added in the system to achieve the control of the water temperature of the system. The temperature-maintaining pressure-maintaining system in the concrete pouring process for the spiral case of the water turbine comprises two pipeline pressure pumps, a pressure maintaining valve, a high-position water tank, two water supplement pumps and a temperature transmitter, the two pipeline pressure pumps are controlled to operate through a frequency converter, and by means of the two pipeline pressure pumps, the pressure maintaining valve, the high-position water tank, the two water supplement pumps and the temperature transmitter, the pressure control and the temperature control are achieved. The two pipeline pressure pumps are controlled by the frequency converter. The pressure maintaining valve and the high-position water tank are used for forming and maintaining the pressure needed by the system, and the high-position water tank, the two water supplement pumps and the temperature transmitter are used for maintaining the water temperature of the system. The temperature-maintaining pressure-maintaining system in the concrete pouring process for the spiral case of the water turbine is simple in composition and convenient to operate and implement. By means of the temperature-maintaining pressure-maintaining system, construction cost can be significantly reduced, and construction difficulty can be lowered at the same time.
Description
Technical field
The utility model relates to a kind of heat-insulation pressure keeping system for concreting, especially is used for the heat-insulation pressure keeping system of spiral case concreting process in the high head water power plant.
Background technology
Along with the progress of technology, the large-scale power station of increasing high head water power plant even head below hundred meters has adopted the mentality of designing of spiral case and concrete combined carrying in the Concrete Design of spiral case.Because external wrapping concrete has been shared internal water pressure, has reduced the true stress of equipment self, not only can increase the safety factor of equipment, also can reduce the alternately fluctuating load of equipment, thereby prolong the life-span of unit.The operation that at present this design has been proved unit is favourable.
In recent years, along with going deep into of research, the impact of temperature in pressurize is built also is taken seriously gradually.Owing to can discharge a large amount of heat in the condensation process of concrete after building, if do not controlled, the heat that discharges can affect the stress distribution of spiral case, produces simultaneously distortion in the time of can making in addition the variations in temperature of spiral case, thereby affect its installation accuracy, and then affect its operational efficiency and life-span.
Domestic large hydropower station such as silk screen secondary have been taked pressurize and have been controlled the way of concrete temperature in spiral case is built.But the control of its temperature only is to take the measure controlling the concrete warehousing temperature and bury cooling water pipe underground in concrete.Such measure can not be taked effective control to real target spiral case, just takes certain measure, has discharged the effort of control temperature, can not guarantee the realization of target temperature.
The utility model content
The purpose of this utility model is to provide a kind of practicality, effectively is used for the heat-insulation pressure keeping system of spiral case concreting process.
In order to solve the problems of the technologies described above, the technical solution adopted in the utility model is: a kind of heat-insulation pressure keeping system for the spiral case concreting process comprises forming and keeping the pressure control device that reaches authorized pressure in the spiral case and realize temperature control equipment to system water temperature control by the amount that control replenishes cold water in the system.
Described pressure control device comprises the pipeline force (forcing) pump of Frequency Converter Control, holding valve and high level cistern, described temperature control equipment comprises the high level cistern that shares with pressure control device, small pump and temperature transmitter, the spiral case intake-outlet is all with interim shrouding sealing, make it to become a closed cavity, in spiral case, there is a cooling water pipe to cause the end of delivery port farthest along the spiral case center arrangement from water inlet, the radiator drain that is positioned at the high level cistern bottom is connected to pipeline force (forcing) pump inlet side, pipeline force (forcing) pump outlet side is connected to the water inlet of airtight spiral case by water inlet pipe, between the water container backwater pipe of water tank bottom and outlet pipe at the water inlet of airtight spiral case, be connected successively temperature transmitter and holding valve, described monitoring is arranged on the outlet pipeline of holding valve from the temperature transmitter of the temperature of spiral case cooling water out, is provided with the high level cistern filling pipe of high level cistern bleed off pipe and connection small pump on the top of high level cistern.
Described cooling water pipe is connected with the water inlet pipe of spiral case or the outlet pipe of spiral case connects.
Described high level cistern is provided with and sends alarm signal and start simultaneously the water-level gauge that small pump in time fills into water when water level in the water tank reduces.
Be provided with the pressure transmitter of controlling pipeline force (forcing) pump frequency according to pressure signal at the pressurization delivery side of pump.
Described small pump and pipeline force (forcing) pump are respectively two, a job, and one is for subsequent use.
The end elevation of described high level cistern is higher than the peak of spiral case, and lowest elevation is poor greater than 1m; The capacity of high level cistern is not less than 5% of spiral case volume.
Described holding valve is selected spring micro-opening formula structure.
Described small pump is selected submersible pump, is arranged in the tail water river course.
The beneficial effects of the utility model are: heat-insulation pressure keeping of the present utility model system, simple and practical, construction cost is low.Be applicable to the heat-insulation pressure keeping control when the spiral case concreting of middle high water head, can improve the installation accuracy of equipment, and prolong the life-span of unit.
Description of drawings
Fig. 1 is the heat-insulation pressure keeping systematic schematic diagram for the spiral case concreting process of the present utility model.
The specific embodiment
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail:
As shown in Figure 1, heat-insulation pressure keeping system for the spiral case concreting process of the present utility model comprises forming and keeping the pressure control device that reaches authorized pressure in the spiral case 15 and realize temperature control equipment to system water temperature control by the amount that control replenishes cold water in the system.
Described pressure control device comprises the pipeline force (forcing) pump 1 of Frequency Converter Control, holding valve 2 and high level cistern 3, described temperature control equipment comprises the high level cistern 3 that shares with pressure control device, small pump 4 and temperature transmitter 5, spiral case 15 intake-outlets are all with interim shrouding sealing, make it to become a closed cavity, in spiral case, there is a cooling water pipe 9 to cause the end of delivery port 17 farthest from water inlet 16 along the spiral case center arrangement, the radiator drain 10 that is positioned at high level cistern 3 bottoms is connected to pipeline force (forcing) pump 1 inlet side, pipeline force (forcing) pump 1 outlet side is connected to the water inlet 16 of airtight spiral case 15 by water inlet pipe 12, between the water container backwater pipe 11 of water tank bottom and outlet pipe 13 at the water inlet 16 of airtight spiral case, be connected successively temperature transmitter 5 and holding valve 2, described monitoring is arranged on the outlet pipeline of holding valve 2 from the temperature transmitter 5 of the temperature of spiral case cooling water out, is provided with the high level cistern filling pipe 14 of high level cistern bleed off pipe 8 and connection small pump 4 on the top of high level cistern 3.
Described cooling water pipe 9 is connected with the water inlet pipe 12 of spiral case or the outlet pipe 13 of spiral case connects.
Described high level cistern 3 is provided with and sends alarm signal and start simultaneously the water-level gauge 7 that small pump 4 in time fills into water when water level in the water tank reduces.
Outlet at force (forcing) pump 1 is provided with the pressure transmitter 6 of controlling pipeline force (forcing) pump 1 frequency according to pressure signal.
Described small pump 4 and pipeline force (forcing) pump 1 are respectively two, a job, and one is for subsequent use.
The end elevation of described high level cistern 3 is higher than the peak of spiral case, and lowest elevation is poor greater than 1m; The capacity of high level cistern 3 is not less than 5% of spiral case volume.
Described holding valve 2 is selected spring micro-opening formula structure.The setting of described holding valve 2 should make hydraulic pressure close being lower than under the dwell pressure of regulation in limited time, and when pressure raise gradually, holding valve was opened gradually; During rated pressure to be reached, its flow that passes through should be near the operating point flow of pipeline force (forcing) pump 1.
Described small pump 4 is selected submersible pump, is arranged in the tail water river course.
The below is elaborated to the utility model:
The utility model system relatively independent by two and that be closely connected realizes respectively the control to pressure and temperature.Control pressurer system can realize keeping in the spiral case pressure of regulation, and makes water keep flowing.Temperature control system can maintain system water temperature in certain scope, thereby the temperature that guarantees spiral case is relatively stable.
Described control pressurer system comprises two pipeline force (forcing) pumps 1 by Frequency Converter Control, a holding valve 2 and a high level cistern 3 etc.The layout of described high level cistern 3 need be higher than spiral case 15 certain altitudes, as the buffer tank of whole control pressurer system.The outlet pipe of described high level cistern 3 is connected to pipeline force (forcing) pump inlet side, and the water inlet of spiral case and delivery port all with interim shrouding sealing, are made it to become a closed cavity.Have a cooling water pipe to cause end from water inlet 16 along the spiral case center arrangement in spiral case, this cooling water pipe is connected by outlet pipe 13 with the holding valve 2 of described control pressurer system in the present embodiment, and holding valve 2 rear pipelines draw and are back to described high level cistern 3.Like this, namely form one and be enclosed within the reclaimed water system that certain pressure is arranged in the spiral case, its route is: the delivery port 17-holding valve of the water inlet-cooling water pipe of high level cistern-pipeline force (forcing) pump-spiral case-spiral case-high level cistern.
The setting of described holding valve 2 should make hydraulic pressure close being lower than under the dwell pressure of regulation in limited time, with protection system decompression not; When pressure raise gradually, holding valve was opened gradually, discharged certain flow; During rated pressure to be reached, its flow that passes through should be near the operating point flow of pipeline force (forcing) pump 1.
Described temperature control system comprises the described high level cistern 3 of control pressurer system, two small pumps 4 and a temperature transmitter 5.Described temperature transmitter 5 is arranged on the outlet pipeline behind the holding valve 2, and monitoring is from the temperature of spiral case cooling water out.Described small pump 4 is generally selected submersible pump, is arranged in the tail water river course.Water in the described control pressurer system is owing to absorb the heat that concrete setting discharges in cyclic process, water temperature will raise gradually.After the water temperature rising reaches the upper limit, small pump 4 will start, and river is pumped in the high level cistern.The cold water that fills into enters behind the high level cistern 3 because the density senior general sinks, and the hot water in the raw water box rises, and flows out from the bleed off pipe 8 of water tank upper.Like this, by the displacement of hot and cold water, intrasystem water temperature is reduced to the scope of permission.After system water temperature was reduced to lower limit, small pump 4 stopped moisturizing.Two small pumps are a job, and one for subsequent use.
Described high level cistern 3 is concourses of control pressurer system and temperature control system.Described high level cistern is as the buffer area of pressure circulation system on the one hand, and high level cistern can come by the cold water that injects suitable quantity to high level cistern the water temperature of controlled circulation system as the point of cold water and hot water mixing on the other hand.
Should make the end elevation of high level cistern 3 be higher than the peak of spiral case when installing, its depth displacement should be grasped according to the situation at scene, should be greater than 1m but lowest elevation is poor.The capacity of high level cistern 3 can be selected according to field condition, generally is not less than 5% of spiral case volume, but minimum should not be less than 1m
3, and highly should not be less than 1m.High level cistern 3 is provided with four water inlet pipe and water outlet pipes, and wherein high level cistern outlet pipe 10 and high level cistern return pipe 11 are the water lines of control pressurer system, and outlet pipe 10 is connected to the inlet side of pipeline force (forcing) pump 1.
Pipeline force (forcing) pump 1 is the element of control pressurer system mineralization pressure.According to the pressure of required maintenance in the spiral case concrete casting process, calculate again the hydraulic loss of pipe-line system, can determine the lift of pipeline force (forcing) pump 1.The flow of pipeline force (forcing) pump 1 decides according to the water temperature of concrete calorific value peak value and on-the-spot cooling water source (being generally river).Because water pump is the standard serialization product, the lift of the rated point of its selection and flow should be slightly larger than needed value.Reality with the time will adjust according to required pressurize value the running frequency (reducing work frequency use) of water pump, this moment flow must be slightly larger than required cooling water inflow.Two pipeline force (forcing) pumps 1 are a job, and one for subsequent use.Install pressure transmitter 6 every pipeline pressurization outlet, and control the frequency of pipeline pressurization 1 according to pressure signal.Simultaneously, in the import of every water pump the maintenance gate valve is set, in the outlet of every water pump the necessary valvings such as flap valve, maintenance gate valve is set.
The water with pressure from pipeline force (forcing) pump 1 flows out namely enters airtight spiral case 15 through the water pump water outlet connecting pipe.Press water flows to its end along spiral case after entering spiral case, enters cooling water pipe 9 to end, then flow to the water inlet of spiral case and flows out spiral case along cooling water pipe 9, thereby spiral case is cooled off.The caliber of cooling water pipe 9 can adopt the stainless-steel seamless pipe of DN50 ~ DN100.In the present embodiment, described cooling water pipe 9 is connected with the outlet pipe 13 of spiral case.Certainly, also can select to be connected with the water inlet pipe 12 of spiral case.
The water that flows out from spiral case flow to holding valve 2 through the outlet pipe 13 of spiral case.Holding valve 2 is key elements of this system pressure of control.Holding valve 2 should be selected spring micro-opening formula structure, and its set-pressure (being opening pressure) can be regulated by the pretension decrement that changes spring.The setting of holding valve 2 should make hydraulic pressure close being lower than under the dwell pressure of regulation in limited time, with protection system decompression not; When pressure raise gradually, holding valve was opened gradually, discharged certain flow; When waiting to reach specified dwell pressure, its flow that passes through should be near the operating point flow of water pump, has namely formed the circulating system with authorized pressure this moment.The bore of holding valve 2 should determine that this moment, corresponding operating pressure should be the required rated pressure of system's pressurize according to the working flow (pump operating point flow) of system.
The water that flows out from holding valve 2 flows back to high level cistern again through high level cistern return pipe 11, has namely finished a circulation from control pressurer system.
After cooling water circulates repeatedly in system, absorbed the heat that concrete discharges, temperature raises gradually.Reach certain value (as than high 2 ℃ of specified water temperature the time) when temperature transmitter 5 monitors water temperature, small pump 4 namely starts, and cold water is pumped in the high level cistern 3 by high level cistern filling pipe 14.Because cold water enters high level cistern 3 rear sinkings, make the higher hot water come-up of high level cistern 3 interior original temperature and pass through high level cistern bleed off pipe 8 and flow out.By cold and hot displacement, the water that temperature is higher is displaced the circulating system gradually like this, and the water temperature of system reduces gradually.Reach certain value (as than low 2 ℃ of specified water temperature the time) when temperature transmitter 5 monitors water temperature, small pump 4 is namely out of service.
Described high level cistern is the concourse of pressure maintenance system and temperature control system.High level cistern is as the buffer area of pressure circulation system on the one hand, and high level cistern can come by the cold water that injects suitable quantity to high level cistern the water temperature of controlled circulation system as the point of cold water and hot water mixing on the other hand.As previously mentioned, high level cistern is provided with four water inlet pipe and water outlet pipes, and wherein high level cistern filling pipe 14 and high level cistern bleed off pipe 8 are the water lines of temperature control system, and cold water flows into water tanks and hot water flows out water tanks from bleed off pipe 8 from filling pipe 14, thereby water temperature is reduced.Simultaneously, high level cistern 3 also is provided with water-level gauge 7, and when water level in the water tank reduced, water-level gauge sent alarm signal, starts simultaneously small pump 4 and in time fills into water.
Described small pump is generally selected submersible pump, and is reliable, failure rate is low.The flow of every small pump can be selected by being full of high level cistern in 2 ~ 5 minutes, and its lift is determined according to depth displacement and the line arrangement situation of water source and high level cistern.Two small pumps are a job, a mode of operation for subsequent use.
Described temperature transmitter 5 suitable selected ranges are narrower, the element that precision is higher.Its certainty of measurement absolute value should not be greater than ± 0.5 ℃.
The rated pressure of the equipment such as the pipeline of described method, valve is determined according to position and corresponding operating pressure.The caliber of each pipeline is determined according to its flow and economic velocity.
More than introduction that spiral case concreting heat-insulation pressure keeping provided by the utility model system is carried out, for one of ordinary skill in the art, according to thought of the present utility model, all will change in specific embodiments and applications.In sum, this description should not be construed as restriction of the present utility model, and all any changes of making according to the utility model design philosophy are all within protection domain of the present utility model.
Claims (9)
1. heat-insulation pressure keeping system that is used for the spiral case concreting process, it is characterized in that, comprise forming and keeping the pressure control device that reaches authorized pressure in the spiral case and realize temperature control equipment to system water temperature control by the amount that control replenishes cold water in the system.
2. the heat-insulation pressure keeping system for the spiral case concreting process according to claim 1, it is characterized in that, described pressure control device comprises the pipeline force (forcing) pump (1) of Frequency Converter Control, holding valve (2) and high level cistern (3), described temperature control equipment comprises the high level cistern (3) that shares with pressure control device, small pump (4) and temperature transmitter (5), spiral case (15) intake-outlet is all with interim shrouding sealing, make it to become a closed cavity, in spiral case, there is a cooling water pipe (9) to cause the end of delivery port (17) farthest from water inlet (16) along the spiral case center arrangement, the radiator drain (10) that is positioned at high level cistern (3) bottom is connected to pipeline force (forcing) pump (1) inlet side, pipeline force (forcing) pump (1) outlet side is connected to the water inlet (16) of airtight spiral case (15) by water inlet pipe (12), be connected successively temperature transmitter (5) and holding valve (2) between the water container backwater pipe (11) that is positioned at the water tank bottom and the outlet pipe (13) of the water inlet that is positioned at airtight spiral case (16), described monitoring is arranged on the outlet pipeline of holding valve (2) from the temperature transmitter (5) of the temperature of spiral case cooling water out, is provided with the high level cistern filling pipe (14) of high level cistern bleed off pipe (8) and connection small pump (4) on the top of high level cistern (3).
3. the heat-insulation pressure keeping system for the spiral case concreting process according to claim 2 is characterized in that, described cooling water pipe (9) is connected with the water inlet pipe (12) of spiral case or the outlet pipe (13) of spiral case connects.
4. the heat-insulation pressure keeping system for the spiral case concreting process according to claim 2, it is characterized in that described high level cistern (3) is provided with and sends alarm signal and start simultaneously the water-level gauge (7) that small pump (4) in time fills into water when water level in the water tank reduces.
5. the heat-insulation pressure keeping system for the spiral case concreting process according to claim 2 is characterized in that, is provided with the pressure transmitter (6) of controlling pipeline force (forcing) pump (1) frequency according to pressure signal in the outlet of force (forcing) pump (1).
6. the heat-insulation pressure keeping system for the spiral case concreting process according to claim 2 is characterized in that, described small pump (4) and pipeline force (forcing) pump (1) are respectively two, a job, and one is for subsequent use.
7. the heat-insulation pressure keeping system for the spiral case concreting process according to claim 2 is characterized in that, the end elevation of described high level cistern (3) is higher than the peak of spiral case, and lowest elevation is poor greater than 1m; The capacity of high level cistern (3) is not less than 5% of spiral case volume.
8. the heat-insulation pressure keeping system for the spiral case concreting process according to claim 2 is characterized in that, described holding valve (2) is selected spring micro-opening formula structure.
9. the heat-insulation pressure keeping system for the spiral case concreting process according to claim 1 is characterized in that, described small pump (4) is selected submersible pump, is arranged in the tail water river course.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012204269140U CN202755354U (en) | 2012-08-24 | 2012-08-24 | Temperature-maintaining pressure-maintaining system in concrete pouring process for spiral case of water turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012204269140U CN202755354U (en) | 2012-08-24 | 2012-08-24 | Temperature-maintaining pressure-maintaining system in concrete pouring process for spiral case of water turbine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202755354U true CN202755354U (en) | 2013-02-27 |
Family
ID=47734543
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012204269140U Withdrawn - After Issue CN202755354U (en) | 2012-08-24 | 2012-08-24 | Temperature-maintaining pressure-maintaining system in concrete pouring process for spiral case of water turbine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202755354U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102797244A (en) * | 2012-08-24 | 2012-11-28 | 中水北方勘测设计研究有限责任公司 | Heat preservation and pressure maintenance system for water turbine volute concrete pouring process |
-
2012
- 2012-08-24 CN CN2012204269140U patent/CN202755354U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102797244A (en) * | 2012-08-24 | 2012-11-28 | 中水北方勘测设计研究有限责任公司 | Heat preservation and pressure maintenance system for water turbine volute concrete pouring process |
| CN102797244B (en) * | 2012-08-24 | 2014-09-03 | 中水北方勘测设计研究有限责任公司 | Heat preservation and pressure maintenance system for water turbine volute concrete pouring process |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203616679U (en) | Cooling water circulating control device for mass concrete | |
| CN104563514B (en) | Large-volume concrete circulation cooling system | |
| CN110206100B (en) | Method for conducting water delivery in ice period by equivalently filling and pumping and recycling geothermal energy | |
| CN206362240U (en) | High-power diesel engine its Test Rig low temperature water-cooling circulating device | |
| CN104729178A (en) | Power plant seawater once-through cooling system | |
| CN103175243B (en) | Double water pump water supplementing constant pressure system and constant pressure method | |
| CN202755354U (en) | Temperature-maintaining pressure-maintaining system in concrete pouring process for spiral case of water turbine | |
| CN102797244B (en) | Heat preservation and pressure maintenance system for water turbine volute concrete pouring process | |
| CN107010993B (en) | Cooling system for mass concrete | |
| CN110569559A (en) | Method for calculating maximum temperature tensile stress of end free lining plate in concrete construction period | |
| CN113701989B (en) | Pumped storage model test device and method capable of simulating liquid column separation | |
| CN205156210U (en) | Take auxiliary cold source's ocean refrigerated water concentrated cooling system | |
| CN204080938U (en) | There is the siphonic water-collecting well of hot water return passage | |
| CN109598007A (en) | A kind of high liquid-gas ratio gas well underground throttle technological parameter calculation method | |
| CN105240970A (en) | Sea-chilled-water concentrated cold supplying system with auxiliary cold source and concentrated cold supplying method | |
| CN203476678U (en) | Variable flow energy-saving water system based on frequency converter | |
| CN203323391U (en) | Water circulating system of water heater | |
| CN207963160U (en) | A kind of air source heat pump Multifunctional heater | |
| CN205446495U (en) | Recirculated cooling water device suitable for oil -well rig braking system | |
| CN206944564U (en) | A kind of cooling water system for downhole cooling refrigeration system | |
| CN103806502B (en) | Pipe network for communicated operation of cooling water filling system and production water supply system in low-temperature season | |
| CN201695451U (en) | Water supplying device with independently controlled temperature, flow quantity and pressure | |
| CN105507603A (en) | Heating apparatus enabling convenience for winter concrete construction | |
| CN202955844U (en) | Bathroom hot-water system based on mobile heat supply mode | |
| CN203335935U (en) | Balancing water-mixing automatic emptying valve and hot water system with same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130227 Effective date of abandoning: 20140903 |
|
| RGAV | Abandon patent right to avoid regrant |