CN208044414U - A kind of wide-range high-accuracy automatic flow control system - Google Patents
A kind of wide-range high-accuracy automatic flow control system Download PDFInfo
- Publication number
- CN208044414U CN208044414U CN201820282031.4U CN201820282031U CN208044414U CN 208044414 U CN208044414 U CN 208044414U CN 201820282031 U CN201820282031 U CN 201820282031U CN 208044414 U CN208044414 U CN 208044414U
- Authority
- CN
- China
- Prior art keywords
- flow
- water
- heat exchanger
- valve
- plate heat
- 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.)
- Active
Links
Landscapes
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
Abstract
The utility model discloses a kind of wide-range high-accuracy automatic flow control systems, the system comprises plate heat exchanger, be arranged plate heat exchanger primary side water cooling module and test module in plate exchanger secondary side is set, the water cooling module includes water cooling unit and temperature proportional valve；The test module includes controller, frequency converter, water tank, water pump and tested resistance element, system outlet temperature sensor, flow proportion valve and outlet pressure sensor are installed on the pipeline between the water pump and tested resistance element, system inlet pressures sensor, inlet temperature sensor and flow sensor are installed on tested pipeline between resistance element and plate heat exchanger.The utility model realizes requirement of the system to wide scope flow, high precision in control, realizes high-precision flow control, and control efficiency greatly improves.
Description
Technical field
The utility model is related to flow control technique fields, are automatically controlled more particularly to a kind of wide-range high-accuracy flow
System.
Background technology
Flow automatic control mode usually used at present is by controlling electronically controlled proportional valve aperture come the stream of control system
It measures or by frequency converter frequency modulation control pump rotary speed come control system flow.Both control modes have the shortcomings that respective.
Although by control electronically controlled proportional valve aperture can with wide scope control system flow, due to proportioning valve nonlinear characteristic and
It is difficult high-precision control system flow to adjust step number limitation.By frequency converter frequency modulation control pump rotary speed come control system flow
Although mode can be with high-precision control flow, due to frequency control scope limitation, so wide scope flow control difficult to realize
System.In flow testing system, if system under test (SUT) flow resistance variation range is very big, and requires high-precision fixed flow, traditional stream
Amount automatic control mode cannot achieve.
Invention content
The purpose of the utility model is to overcome the deficiencies in the prior art, designs a kind of wide-range high-accuracy flow and control automatically
System processed, meets requirement of the test system to wide scope flow, high precision in control, and system control precision is up to +/-
0.05L/Min。
In order to achieve the above objectives, technical solution used by the utility model is：
A kind of wide-range high-accuracy automatic flow control system, including plate heat exchanger, setting it is primary in plate heat exchanger
The water cooling module of side and test module in plate exchanger secondary side is set, the water cooling module includes and plate heat exchanger
The water cooling unit being connected, the temperature proportional valve being arranged between water cooling unit and plate heat exchanger by cold water pipeline；The test
Module includes controller, frequency converter, the water tank being connected with plate heat exchanger, by testing pipeline is connected to the water of tank outlet
Pump, the tested resistance element being connect respectively with water pump and plate heat exchanger by testing pipeline, the water pump are electrically connected with frequency converter
It connects, system outlet temperature sensor, flow proportion valve and outlet pressure is installed on the pipeline between water pump and tested resistance element
Force snesor is tested on the pipeline between resistance element and plate heat exchanger and is equipped with inlet pressure transducer, inlet temperature passes
Sensor and flow sensor, the outlet temperature sensor, outlet pressure sensor, inlet temperature sensor, inlet pressure pass
Sensor, flow sensor, flow proportion valve and temperature proportional valve are electrically connected with controller respectively.
Preferably, first filter is installed between the temperature proportional valve and water cooling unit, between water tank and water pump
Second filter is installed.
Preferably, the first bypass is provided between the water outlet of the first filter and the water inlet end of water cooling unit
Valve is provided with the second by-passing valve between the water outlet and plate heat exchanger of water pump.
Preferably, it is additionally provided with liquid-level switch in the water tank.
Preferably, the controller and frequency converter are mounted in a switch board, switch board, water tank, water pump, first
Filter, the second filter, flow proportion valve, plate heat exchanger and temperature proportional valve are installed in a shell, water cooling unit
It is arranged in the outside of shell with tested resistance element.
Preferably, the switch board, water tank, water pump, plate heat exchanger and temperature proportional valve are arranged at shell
Top, flow proportion valve, the second by-passing valve, flow sensor, outlet pressure sensor, outlet temperature sensor, inlet pressure
Sensor, inlet temperature sensor and the second filter are arranged at the lower part of shell.
Preferably, the bottom of the shell is fixed with universal wheel.
The positive beneficial effect of the utility model：
1, the flow testing system of the utility model is provided with proportioning valve and frequency converter, by controlling and becoming valve opening
Frequency device frequency modulation control is combined, and realizes requirement of the system to wide scope flow, high precision in control, is realized high-precision and is flowed
Amount control, system maximum pressure drop is in the case of 350kPa, flow rate test range 2-80L/Min, and system control precision is up to +/-
0.05L/Min, control accuracy is high, and control efficiency greatly improves.
2, it is provided with the first by-passing valve and the second by-passing valve in the flow testing system of the utility model, can made in pipeline
Liquid blocked by impurity in system or tested resistance element is not installed etc. under abnormal conditions from the first by-passing valve and second
It is flowed through in by-passing valve, water pump is avoided to burn, ensure the unobstructed of system pipeline；And filter is provided in pipeline, it can filter and be
System impurity ensures the operation of system normal table.
Description of the drawings
Fig. 1 is the piping diagram of Tthe utility model system.
Fig. 2 is one of the structural schematic diagram of Tthe utility model system.
Fig. 3 is the second structural representation of Tthe utility model system.
Fig. 4 is the third structural representation of Tthe utility model system.
The concrete meaning of figure label is：1 is water pump, 100 devices in order to control, and 101 be frequency converter, and 2 be flow proportion valve, 3
To be tested resistance element, 4 be flow sensor, and 5 be temperature proportional valve, and 6 be plate heat exchanger, and 7 be water tank, and 8 be water cooling unit, 9
For outlet temperature sensor, 10 be inlet temperature sensor, and 11 be outlet pressure sensor, and 12 be inlet pressure transducer, 13
It is liquid-level switch for quick coupling, 14,15 be the second filter, and 16 be first filter, and 17 be the second by-passing valve, and 18 be first
By-passing valve, 19 cabinets in order to control, 20 for test pipeline, 21 be cold water pipeline, and 22 be shell.
Specific implementation mode
To make the objectives, technical solutions and advantages of the present invention clearer, below by shown in the accompanying drawings
Specific embodiment describes the utility model.However, it should be understood that these descriptions are merely illustrative, and it is not intended to limit this reality
With novel range.In addition, in the following description, descriptions of well-known structures and technologies are omitted, to avoid unnecessarily mixing
Confuse the concept of the utility model.
Illustrate that present embodiment, the wide-range high-accuracy automatic flow control system of the utility model are full in conjunction with Fig. 1-Fig. 4
Requirement of the foot test system to wide scope flow, high precision in control, in the case of system maximum pressure drop is 350kPa, flow
Test scope 2-80L/Min, system control precision are up to +/- 0.05L/Min.The constant temperature constant flow Auto-Test System includes plate
Formula heat exchanger 6, water cooling module and test module.
The primary side in plate heat exchanger 6 is arranged in the water cooling module, includes the water cooling unit being connected with plate heat exchanger 6
8, the temperature proportional valve 5 being arranged between water cooling unit and plate heat exchanger by cold water pipeline 21.The temperature proportional valve 5 and water
First filter 16 is installed, first filter 16 may filter that the impurity in cold water pipeline 21, ensure that pipeline is logical between cold 8
Often, it is ensured that the normal operation of system.It is provided with the first bypass between the water outlet and the water inlet end of water cooling unit 8 of first filter 16
Valve 18, temperature proportional valve 5 are used for control system temperature.Water cooling unit 8, first is filtered by cold water pipeline 21 air conditioner water side
Device 16, the first by-passing valve 18, temperature proportional valve 5 and plate heat exchanger 6 connect, to provide a system to cold water.
The test module is arranged the secondary side in plate heat exchanger 6, including controller 100, frequency converter 101, water tank 7,
Water pump 1, tested resistance element 3.The water tank 7 plays the role of liquid storage and gas-liquid separation, is connected with plate heat exchanger 6, water
Liquid-level switch 14 is provided in case 7.Water pump 1 is connected to the outlet of water tank 7 by testing pipeline 20, for filtration system impurity, really
Insurance system can normal operation, the second filter 15 can be installed between water tank 7 and water pump 1, tested resistance element 3 passes through test
Pipeline 20 is connected with water pump 1 and plate heat exchanger 6 respectively, and the both sides of tested resistance element 3 are respectively set that there are one self sealss
Quick coupling 13.It is provided with the second by-passing valve 17 between the water outlet and plate heat exchanger 6 of the water pump 1, is set in the present system
The first by-passing valve 18 and the second by-passing valve 17 are set, can make the liquid in pipeline in system by impurity blocking or tested resistance element
It does not install etc. and to be flowed through from the first by-passing valve and the second by-passing valve under abnormal conditions, water pump is avoided to burn, ensure system pipeline
It is unobstructed.System outlet temperature sensor 9, flow proportion valve are also equipped on pipeline between water pump 1 and tested resistance element 3
2 and outlet pressure sensor 11, system inlet pressures are installed on tested pipeline between resistance element 3 and plate heat exchanger 6
Sensor 12, inlet temperature sensor 10 and flow sensor 4.Plate exchanger secondary side, by test pipeline by water tank 7,
Second filter 15, water pump 1, flow proportion valve 2, tested resistance element 3 and plate heat exchanger 6 connect, to tested
Resistance element 3 provides the water of constant temperature constant flow.
The water pump 1 is electrically connected with frequency converter 101, the system outlet temperature sensor 9, outlet pressure sensor 11,
Inlet pressure transducer 12, inlet temperature sensor 10, flow sensor 4, flow proportion valve 2 and temperature proportional valve 5 respectively with
Controller 100 is electrically connected.System outlet temperature sensor 9 and inlet temperature sensor 10 be respectively used to detecting system outlet and
Inlet temperature, system outlet pressure sensor 11 and inlet pressure transducer 12 are respectively used to the pipe of detecting system outlet and entrance
Road internal pressure, flow sensor 4 are used for detecting system flow, and frequency converter 101 and flow proportion valve 2 are used for control system stream
Amount.
As shown in Fig. 2, controller 100 and frequency converter 101 are mounted in a switch board 19, switch board 19, water tank 7, water
Pump 1, first filter 16, the second filter 15, flow proportion valve 2, plate heat exchanger 6, temperature proportional valve 5 are arranged at one
In shell 22, wherein switch board 19, water tank 7, water pump 1, plate heat exchanger 6, temperature proportional valve 5 are fixed on the top of shell 22,
Flow proportion valve 2, the second by-passing valve 17, flow sensor 4, inlet temperature sensor 10, inlet pressure transducer 12, outlet temperature
Degree sensor 9, outlet pressure sensor 11, the second filter 15 are fixed on the lower part of shell, water cooling unit 8 and tested resistance element
3 are arranged at the outside of shell 22, are connected respectively with enclosure interior respective element by pipeline.The bottom of shell 22 is fixed with
Four universal wheels facilitate the movement and use of equipment.
The control method of the utility model wide-range high-accuracy automatic flow control system, specifically includes following steps：
Step 1：Activation system, input set temperature value and setting flow value, frequency converter fix 40HZ operations, water pump operation
Within the scope of 30HZ-50HZ.
Step 2：Real-time acquisition system inlet pressure level, inlet temperature, exit pressure levels, Outlet Temperature value and testing tube
Road flow value, and it is transferred to controller.
Step 3：Outlet Temperature value is compared with set temperature value with A.T.C by controller using pid algorithm
Ratio valve opening, when the outlet temperature that system outlet temperature sensor detects is higher than set temperature value, controller control temperature
The valve opening of degree proportioning valve becomes larger, and allows more cold water to enter plate heat exchanger, system temperature is lowered；Conversely, when being
When the outlet temperature that system outlet temperature sensor detects is higher than set temperature value, the valve of controller control temperature proportional valve is opened
Degree becomes smaller, and a small amount of cold water is allowed to enter plate heat exchanger, due to water pump circular flow, system temperature is made to increase, to make system exist
It is run under steady temperature state.
Meanwhile controller will be tested pipeline flow value using pid algorithm and is compared to flow proportional with setting flow value
The aperture of valve carries out coarse adjustment, enables test pipeline flow value and sets the difference of flow value as flow deviation H.When flow sensor is examined
When the test pipeline flow value measured is higher than setting flow value, the valve opening of controller control flow proportion valve becomes smaller, and makes pipe
Flow in road reduces；When the test pipeline flow value that flow sensor detects is less than setting flow value, controller control
The valve opening of flow proportion valve becomes larger, and the flow in pipeline is made to increase, thus by one phase of fluid flow coarse adjustment in pipeline
To stable state.
Step 4：Controller judges whether the flow deviation H after flow proportion valve coarse adjustment meets the setting of flow grade gradient
Condition.
The flow grade gradient includes four gradation levels, respectively 2L/Min~5L/Min, 5L/Min~10L/
Min, 10L/Min~25L/Min, 25L/Min or more.
Judge whether the flow deviation H after flow proportion valve coarse adjustment meets the specific step of the setting condition of flow grade gradient
Suddenly it is：Judge gradation levels of the setting flow value in flow grade gradient, if 2L/Min≤setting flow value < 5L/Min and |
Flow deviation H | < 0.3L/Min, then according to the delay locked flow proportion valve of the first setting time (as delay 15S locks flow-rate ratio
Example valve), it is no to then follow the steps 5；
If 5L/Min≤setting flow value < 10L/Min and | flow deviation H | < 1L/Min, according to the first setting time
Delay locked flow proportion valve (as delay 15S locks flow proportion valve) is no to then follow the steps 5；
If 10L/Min≤setting flow value < 25L/Min and | flow deviation H | < 2L/Min, according to first set when
Between delay locked flow proportion valve (as delay 15S locks flow proportion valve), it is no to then follow the steps 5；
If set flow value >=25L/Min and | flow deviation H | < 4L/Min, it is delay locked according to the first setting time
Flow proportion valve (as delay 15S locks flow proportion valve), it is no to then follow the steps 5.
Step 5：Flow proportion valve is opened completely, while judging whether present flow rate deviation H is less than adjusting deviation, if small
In, then according to the delay locked flow proportion valve of the second setting time (as delay 20S lock flow proportion valve), then execute step
6；Otherwise illustrate that the resistance for being tested resistance element is very big, frequency converter unlatching half is fully opened plus flow proportion valve all can not
Reach flow coarse adjustment range, step 3 need to be repeated.
The adjusting deviation is the accuracy error set in system, and specifically adjusting deviation is 0.1L/Min.
Step 6：Current test pipeline flow value is compared control with setting flow value using pid algorithm and become by controller
The output frequency of frequency device carries out accurate adjustment to the aperture of flow proportion valve.When flow sensor detects current test pipeline stream
When magnitude is higher than setting flow value, controller makes the output frequency of frequency converter become smaller, and the flow in pipeline is made to reduce；When flow passes
When the test pipeline flow value that sensor detects is less than setting flow value, controller control makes the output frequency of frequency converter become larger,
The flow in pipeline is set to increase, thus by one relatively steady state of fluid flow accurate adjustment in pipeline.
Step 7：Controller judges whether the flow deviation H after flow proportion valve accurate adjustment is less than adjusting deviation, if being less than,
Automatic, high precision flow control is completed；Otherwise, supplement adjusting is carried out to the output frequency of frequency converter.
To the output frequency of frequency converter carry out supplement adjusting the specific steps are：
First, it is determined that after flow proportion valve accurate adjustment frequency converter output frequency, if the output frequency of frequency converter be 50HZ and
Flow deviation H absolute values are more than 0.1L/Min, then illustrate that the tested vertical curve of resistance element group is too steep, frequency converter is from 40HZ to 50HZ
The flow in flow coarse adjustment range can not all be overcome, therefore need to be delayed the output frequency tune of frequency converter according to third setting time
Whole is 40HZ, that is, the output frequency of frequency converter is adjusted to 40HZ by the 20S that is delayed；Then, flow proportion valve is opened completely, according to
Flow proportion valve is locked in maximum opening by the 4th delay locked flow proportion valve of setting time, that is, the 40S that is delayed, and controller utilizes
Pid algorithm automatically controls the output frequency of frequency converter until the flow measured in pipeline reaches setting flow, until realizing wide model
Until enclosing high-precision flow control targe；
If the output frequency of frequency converter is 30HZ, the output frequency of frequency converter is adjusted according to the delay of the 5th setting time
The output frequency of frequency converter is adjusted to 40HZ, then repeats step 3 for 40HZ, that is, the 20S that is delayed, comes back to coarse adjustment step
Suddenly.
I.e. pump power limitation, when tested 3 resistance of resistance element is excessive, 2 He of flow control valve are limited by system P-Q curves
When 101 standard-sized sheet flow system flow of frequency converter is still unable to reach setting flow, system can prompt：" exceed system scope of design！" report
It is alert.
Finally it should be noted that：Above example is only to illustrate the technical solution of the utility model rather than limits it
System；Although the utility model is described in detail with reference to preferred embodiment, those of ordinary skill in the art should
Understand；It can still modify to specific embodiment of the present utility model or some technical characteristics are equally replaced
It changes；Without departing from the spirit of technical solutions of the utility model, should all cover in the claimed technical solution of the utility model
In range.
Claims (7)
1. a kind of wide-range high-accuracy automatic flow control system, which is characterized in that including plate heat exchanger, be arranged and changed board-like
The water cooling module of hot device primary side and test module in plate exchanger secondary side is set,
The water cooling module includes the water cooling unit being connected with plate heat exchanger, by the setting of cold water pipeline in water cooling unit and board-like
Temperature proportional valve between heat exchanger；
The test module include controller, frequency converter, the water tank being connected with plate heat exchanger, by test pipeline be connected to
The water pump of tank outlet, the tested resistance element being connect respectively with water pump and plate heat exchanger by testing pipeline, the water pump
It is electrically connected with frequency converter, system outlet temperature sensor, flow-rate ratio is installed on the pipeline between water pump and tested resistance element
Example valve and outlet pressure sensor are tested on the pipeline between resistance element and plate heat exchanger and are equipped with inlet pressure sensing
Device, inlet temperature sensor and flow sensor, the outlet temperature sensor, outlet pressure sensor, inlet temperature sensing
Device, inlet pressure transducer, flow sensor, flow proportion valve and temperature proportional valve are electrically connected with controller respectively.
2. wide-range high-accuracy automatic flow control system according to claim 1, which is characterized in that the temperature proportional
First filter is installed between valve and water cooling unit, the second filter is installed between water tank and water pump.
3. wide-range high-accuracy automatic flow control system according to claim 2, which is characterized in that first filtering
It is provided with the first by-passing valve between the water outlet of device and the water inlet end of water cooling unit, is set between the water outlet and plate heat exchanger of water pump
It is equipped with the second by-passing valve.
4. wide-range high-accuracy automatic flow control system according to claim 1, which is characterized in that in the water tank also
It is provided with liquid-level switch.
5. wide-range high-accuracy automatic flow control system according to claim 1, which is characterized in that the controller and
Frequency converter is mounted in a switch board, switch board, water tank, water pump, first filter, the second filter, flow proportion valve, plate
Formula heat exchanger and temperature proportional valve are installed in a shell, and water cooling unit and tested resistance element are arranged in the outside of shell.
6. wide-range high-accuracy automatic flow control system according to claim 5, which is characterized in that the switch board,
Water tank, water pump, plate heat exchanger and temperature proportional valve are arranged at the top of shell, flow proportion valve, the second by-passing valve, flow
Sensor, outlet pressure sensor, outlet temperature sensor, inlet pressure transducer, inlet temperature sensor and the second filtering
Device is arranged at the lower part of shell.
7. wide-range high-accuracy automatic flow control system according to claim 6, which is characterized in that the bottom of the shell
Portion is fixed with universal wheel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820282031.4U CN208044414U (en) | 2018-02-28 | 2018-02-28 | A kind of wide-range high-accuracy automatic flow control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820282031.4U CN208044414U (en) | 2018-02-28 | 2018-02-28 | A kind of wide-range high-accuracy automatic flow control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208044414U true CN208044414U (en) | 2018-11-02 |
Family
ID=63950127
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820282031.4U Active CN208044414U (en) | 2018-02-28 | 2018-02-28 | A kind of wide-range high-accuracy automatic flow control system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208044414U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108375901A (en) * | 2018-02-28 | 2018-08-07 | 爱美达（上海）热能系统有限公司 | A kind of High Accuracy Constant Temperature constant flow Auto-Test System and its control method |
| CN109557963A (en) * | 2018-12-25 | 2019-04-02 | 苏州奥德机械有限公司 | A kind of industry simulation test control system that can be precisely controlled flow and temperature |
| CN112327951A (en) * | 2020-12-04 | 2021-02-05 | 中国船舶工业集团公司第七0八研究所 | Automatic flow control system for water pump hydraulic performance test bed |
| CN112859936A (en) * | 2019-11-28 | 2021-05-28 | 上海新微技术研发中心有限公司 | Chemical circulation pipeline flow control system and control method thereof |
-
2018
- 2018-02-28 CN CN201820282031.4U patent/CN208044414U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108375901A (en) * | 2018-02-28 | 2018-08-07 | 爱美达（上海）热能系统有限公司 | A kind of High Accuracy Constant Temperature constant flow Auto-Test System and its control method |
| CN109557963A (en) * | 2018-12-25 | 2019-04-02 | 苏州奥德机械有限公司 | A kind of industry simulation test control system that can be precisely controlled flow and temperature |
| CN112859936A (en) * | 2019-11-28 | 2021-05-28 | 上海新微技术研发中心有限公司 | Chemical circulation pipeline flow control system and control method thereof |
| CN112327951A (en) * | 2020-12-04 | 2021-02-05 | 中国船舶工业集团公司第七0八研究所 | Automatic flow control system for water pump hydraulic performance test bed |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN208044414U (en) | A kind of wide-range high-accuracy automatic flow control system | |
| CN108375901A (en) | A kind of High Accuracy Constant Temperature constant flow Auto-Test System and its control method | |
| JPH0564801B2 (en) | ||
| CN113092526A (en) | Multifunctional thermal engineering experiment platform | |
| CN108776025B (en) | Thermal management system test platform of electric drive system | |
| CN109945943A (en) | Two-way flow resistance test macro and method suitable for different fluid equipment | |
| CN104502131A (en) | Performance testing system for suction filter of speed changing box | |
| CN207162689U (en) | Pipe network balance-conditioning system of heat supply and heating network | |
| CN107782019A (en) | The control method of flash vessel, air-conditioner system and air-conditioner system | |
| CN208734420U (en) | Engine decomposes frictional work and tests cooling fluid temperature control system | |
| CN114753996A (en) | Water pump test bench and test method | |
| JPS6013279A (en) | Collector for sample of gassy or vaporish radioactive substance | |
| CN104226074B (en) | Containing sour washing tail gas device | |
| CN101750230A (en) | Performance detection device suitable for water-cooled refrigerating and compressing condenser unit | |
| CN109974320B (en) | High-temperature deionized water cooling device | |
| CN207894593U (en) | A kind of multi-way valve pressure-resistant test system | |
| CN105650919B (en) | Air-conditioning system and jet degree of superheat adjusting method | |
| CN111089097B (en) | Closed loop temperature control system and platform for test | |
| CN204556285U (en) | A kind of water chiller performance test apparatus | |
| CN208595119U (en) | A kind of hydraulic test system | |
| CN113154666A (en) | Integrated mold temperature control system | |
| CN208793377U (en) | Valve body assembly durability testing system | |
| CN109186091B (en) | Cooling medium supply device and control method | |
| CN206496512U (en) | A kind of directly-heated type variable-flow hot-water heating system | |
| CN105953950A (en) | Pipeline fluid detection device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: No. 1199 Xinfei Road, Songjiang District, Shanghai, 20161 Patentee after: Baode (Shanghai) Technology Co.,Ltd. Address before: No. 1199 Xinfei Road, Songjiang District, Shanghai, 20161 Patentee before: AAVID THERMALLOY LLC |
|
| CP01 | Change in the name or title of a patent holder |