CN106768091B - Be used for generating set efficiency test discharge and temperature measuring device - Google Patents
Be used for generating set efficiency test discharge and temperature measuring device Download PDFInfo
- Publication number
- CN106768091B CN106768091B CN201710165589.4A CN201710165589A CN106768091B CN 106768091 B CN106768091 B CN 106768091B CN 201710165589 A CN201710165589 A CN 201710165589A CN 106768091 B CN106768091 B CN 106768091B
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- generator
- pipe
- connecting part
- water
- temperature
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/18—Supports or connecting means for meters
- G01F15/185—Connecting means, e.g. bypass conduits
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/14—Supports; Fastening devices; Arrangements for mounting thermometers in particular locations
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/18—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a linear resistance, e.g. platinum resistance thermometer
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Monitoring And Testing Of Nuclear Reactors (AREA)
Abstract
The invention discloses a water flow and temperature measuring device for an efficiency test of a generator, which comprises a pipeline for connecting a water inlet pipe of the generator with a water outlet pipe of the generator; the pipeline comprises a first connecting part connected with a water inlet pipe of the generator, an instrument test section connected with the first connecting part and a second connecting part connected with a water outlet pipe of the generator; a temperature-measuring platinum resistor is arranged between the first connecting part and the instrument test section; the instrument test section sequentially comprises a front straight pipe section, a flowmeter, a rear straight pipe section, a throttle valve and a drain hole; the invention can adapt to the test of different water flow systems, has uniform flow rate, stable temperature, accurate test, large adjustable range of temperature difference and small measurement error; the method is suitable for efficiency tests of the steam turbine generator, the nuclear generator and the hydraulic generator, and has good popularization and application values.
Description
Technical Field
The invention relates to a generator efficiency test measuring device, in particular to a water flow and temperature measuring device for a generator set efficiency test.
Background
In an on-site generator efficiency test, the condition of energy conversion of a generator in the power generation process needs to be checked; efficiency affects how much energy is consumed by the generator, and when the motor is loaded, all losses of the motor eventually become heat, which is transferred to the cooling medium; therefore, each loss of the motor can be obtained by only measuring the temperature rise and the flow of the cooling medium, so that the efficiency of the motor is obtained; at this time, a corresponding test device is needed to measure the flow and temperature rise of the cooling medium; there is currently no corresponding measuring device for this test.
Disclosure of Invention
The invention provides a cooling medium flow and temperature measuring device used for a generator efficiency test.
The technical scheme adopted by the invention is as follows: a water flow and temperature measuring device for efficiency test of a generator comprises a pipeline for connecting a water inlet pipe of the generator with a water outlet pipe of the generator; the pipeline comprises a first connecting part connected with a water inlet pipe of the generator, an instrument test section connected with the first connecting part and a second connecting part connected with a water outlet pipe of the generator; a temperature-measuring platinum resistor is arranged between the first connecting part and the instrument test section; the instrument test section sequentially comprises a front straight pipe section, a flowmeter, a rear straight pipe section, a throttle valve and an exhaust hole.
Further, the pipeline is U-shaped or omega-shaped.
Further, the first connecting portion is further provided with a transition hose.
Further, the first connecting part is connected with the instrument test section through a first throttling conical pipe, and the instrument test section is connected with the second connecting part through a second throttling conical pipe.
Further, at least one height-adjustable pipe mounting bracket is also provided for supporting the pipe.
Further, an extension tube is further arranged between the transition hose and the instrument test section.
Further, the first connecting portion is connected with a water inlet pipe of the generator through a first flange bent pipe, wherein the flanges at two ends of the bent pipe are different in size.
Further, the second connecting part is connected with the water outlet pipe of the generator through a second flange bent pipe, wherein the flanges at two ends of the bent pipe are different in size.
Furthermore, the temperature measuring platinum resistor, the flowmeter and the throttle valve are all arranged on the pipeline through the bent pipe with the flange.
The beneficial effects of the invention are as follows:
(1) According to the invention, cooling water is converted through the flange bent pipe, and then the flow velocity of the cooling water is uniform under the action of the throttling conical pipe and the throttling valve, so that the measuring pipeline is full; the flow velocity is improved by decreasing the throttle, so that the measurement accuracy of the flow is improved;
(2) According to the invention, the water flow can be regulated through the throttle valve and the throttle conical pipe, the Reynolds number is in a certain range after the pipe diameter of the measuring end of the meter is reduced successively, the water flow is uniform and kept in a laminar state, when the throttle valve is regulated to reduce the water flow, the outlet water temperature is increased, and the measurement accuracy of the temperature difference is improved;
(3) The invention can be used for motor efficiency tests of turbo generators, nuclear generators, hydraulic generators and the like which take water as a secondary cooling medium, and has good popularization and application values.
Drawings
Fig. 1 is a front view of the present invention.
Fig. 2 is a schematic view of the vertical installation of the present invention.
Fig. 3 is a schematic view of a horizontal installation.
Fig. 4 is a schematic view of a pipe installation bracket according to the present invention.
In the figure: the device comprises a 1-generator water inlet pipe, a 2-first flange bent pipe, a 3-transition hose, a 4-extension pipe, a 5-temperature-measuring platinum resistor, a 6-front straight pipe section, a 7-flowmeter, an 8-rear straight pipe section, a 9-throttle valve, a 10-pipeline mounting bracket, an 11-exhaust hole, a 12-second flange bent pipe and a 13-generator water outlet pipe.
Detailed Description
The invention will be further described with reference to the drawings and specific examples.
As shown in fig. 1-3, a water flow and temperature measuring device for efficiency test of a generator set comprises a pipeline for connecting a generator water inlet pipe 1 and a generator water outlet pipe 13; the pipeline comprises a first connecting part connected with the water inlet pipe 1 of the generator, an instrument test section connected with the first connecting part and a second connecting part connected with the water outlet pipe 13 of the generator; a temperature measuring platinum resistor 5 is arranged between the first connecting part and the instrument test section; the instrument test section sequentially comprises a front-end straight pipe section 6, a flowmeter 7, a rear-end straight pipe section 8, a throttle valve 9 and an exhaust hole 11.
When the device is used, cooling water enters the generator water outlet pipe 13 from the generator water inlet pipe 1 through the first connecting part, the temperature measuring platinum resistor 5, the instrument test section and the second connecting part, and redundant air in the pipeline is discharged through the exhaust hole 11; the water in the pipeline of the instrument test section is converted to flow through the front straight pipe section 6, and then the water is acted by the throttle valve 9, so that the flow speed is uniform and parallel to the streamline of the axial flow; measuring the outlet temperature T of cooling water 1 The temperature of the cooling water before entering the generator is T 0 The temperature difference is T 1 -T 0 。
When the efficiency test of the generator is carried out, the loss generated by the motor is taken away by cooling water, and according to national standard GB/T5321-2005, the loss P can be calculated according to the following formula:
P＝C p ·ρ·Q·(T 1 -T 0 )
in the formula, C p Is the specific heat of water, kJ/kg/K;
ρ is the density of water, kg/m 3 ；
Q is water flow, m 3 /h；
T 1 The temperature of the discharged water is the temperature of the discharged water, and the temperature is lower than the temperature;
T 0 the temperature of water inlet is at DEG C.
Further, the pipeline is U-shaped or omega-shaped; the pipeline can also be in other shapes suitable for specific situations, the size and the model of the pipeline are different, and the pipe diameter can be correspondingly reduced after passing through the elbow flange and the measuring end of the instrument.
Further, the first connecting part is also provided with a transition hose 3; the transition hose 3 is arranged to accommodate different connection distances and heights.
Further, the first connecting part is connected with the instrument test section through a first throttling conical pipe, and the instrument test section is connected with the second connecting part through a second throttling conical pipe; cooling water enters an instrument test section after being acted by the first throttling conical pipe, and then enters a generator water outlet pipe 13 through a second connecting part after being amplified by the second throttling conical pipe; the flow velocity of the device is more uniform, and the measurement error is reduced.
Further, at least one height-adjustable pipe mounting bracket 10 is provided for supporting a pipe; the placing height of the test pipeline can be adjusted more conveniently by arranging the pipeline mounting bracket 10, and the test pipeline is suitable for different pipelines.
Further, an extension tube 4 is further arranged between the transition hose 3 and the instrument test section.
Further, the first connecting portion is connected with the generator water inlet pipe 1 through the first flange bent pipe 2.
Further, the second connecting portion is connected to the generator water outlet pipe 13 through a second flange elbow 12.
Further, the temperature measuring platinum resistor 5, the flowmeter 7 and the throttle valve 9 are all arranged on a pipeline through a bent pipe with a flange.
After the water passes through the flange elbow, the throttling conical pipe and the throttling valve 9, the flow velocity of the water is uniform and is parallel to the streamline of the axial flow; the invention can effectively regulate the flow of cooling water, and the flow speed of the lifting water still meets the limit value of Reynolds number, reaches the state of full pipe and is in laminar flow; the flow is reduced by twice decreasing throttling, the temperature difference between the cooling water inlet and outlet is increased, the measurement error is reduced, and the flow and temperature measurement precision is improved, so that the efficiency test precision is improved; the device for measuring the parameters of the cooling medium for the efficiency test of the generator has the advantages that one end of the device is a 90-degree flange, and the other end of the device is a flange with a hose, so that the device can adapt to different connection distances and angles; the method can accurately measure the flow and the temperature of the cooling medium, accurately calculate the loss of the motor, can be used for measuring the loss taken away by coolers such as air, thrust bearings, guide bearings and the like, can also be used for motor efficiency tests of turbo generators, nuclear generators, hydraulic generators and the like which take water as a secondary cooling medium, and has good popularization and application values.
Claims (6)
1. The utility model provides a be used for generator efficiency test discharge and temperature measurement device which characterized in that: comprises a pipeline for connecting a generator water inlet pipe (1) and a generator water outlet pipe (13); the pipeline comprises a first connecting part connected with the water inlet pipe (1) of the generator, an instrument test section connected with the first connecting part and a second connecting part connected with the water outlet pipe (13) of the generator; a temperature-measuring platinum resistor (5) is arranged in the middle of the first connecting part; the instrument test section sequentially comprises a front end straight pipe section (6), a flowmeter (7), a rear end straight pipe section (8), a throttle valve (9) and an exhaust hole (11);
the first connecting part is connected with the instrument test section through a first throttling conical pipe, and the instrument test section is connected with the second connecting part through a second throttling conical pipe;
the first connecting part is connected with a generator water inlet pipe (1) through a first flange bent pipe (2); the second connecting part is connected with a water outlet pipe (13) of the generator through a second flange bent pipe (12).
2. A water flow and temperature measurement device for generator efficiency test as claimed in claim 1, wherein: the pipeline is U-shaped or omega-shaped.
3. A water flow and temperature measurement device for generator efficiency test as claimed in claim 1, wherein: the first connecting part is also provided with a transition hose (3).
4. A water flow and temperature measurement device for generator efficiency test as claimed in claim 1, wherein: at least one height-adjustable pipe mounting bracket (10) is also provided for supporting a pipe.
5. A water flow and temperature measurement device for generator efficiency test as claimed in claim 3, wherein: an extension tube (4) is further arranged between the transition hose (3) and the instrument test section.
6. A water flow and temperature measurement device for generator efficiency test as claimed in claim 1, wherein: the temperature measuring platinum resistor (5), the flowmeter (7) and the throttle valve (9) are all arranged on a pipeline through a bent pipe with a flange.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710165589.4A CN106768091B (en) | 2017-03-20 | 2017-03-20 | Be used for generating set efficiency test discharge and temperature measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710165589.4A CN106768091B (en) | 2017-03-20 | 2017-03-20 | Be used for generating set efficiency test discharge and temperature measuring device |
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| Publication Number | Publication Date |
|---|---|
| CN106768091A CN106768091A (en) | 2017-05-31 |
| CN106768091B true CN106768091B (en) | 2023-09-22 |
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| CN201710165589.4A Active CN106768091B (en) | 2017-03-20 | 2017-03-20 | Be used for generating set efficiency test discharge and temperature measuring device |
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