CN206772355U - One kind is used for generating set efficiency test water-carrying capacity and temperature measuring equipment - Google Patents

Abstract

The utility model discloses a water flow and temperature measuring device for generator efficiency test, which comprises a pipe connecting the generator water inlet pipe and the generator outlet pipe; the pipe includes a first connection part connected with the generator water inlet pipe, and a The instrument test section connected by the first connection part and the second connection part connected with the generator outlet pipe; the temperature measuring platinum resistance is arranged between the first connection part and the instrument test section; the instrument test section includes the front straight pipe section, flow meter, Straight pipe section at the rear end, throttle valve and drainage hole; the utility model can adapt to the test of different water flow systems, with uniform flow rate, stable temperature, accurate test, large adjustable range of temperature difference, and small measurement error; it can be applied to steam turbine generators , nuclear power generators and water turbine generator efficiency tests, has a good promotion and application value.

Description

A water flow and temperature measuring device for generator set efficiency test

technical field

The utility model relates to a generator efficiency test measuring device, in particular to a water flow and temperature measuring device for the generator set efficiency test.

Background technique

In the on-site generator efficiency test, it is necessary to check the energy conversion of the generator during the power generation process; the efficiency affects the amount of energy consumed by the generator. When the motor is loaded, all losses of the motor will eventually become heat, and the heat To the cooling medium; therefore, as long as the temperature rise and flow rate of the cooling medium are measured, the various losses of the motor can be obtained, so as to obtain the efficiency of the motor; at this time, corresponding test devices are needed to measure the flow rate and temperature rise of the cooling medium; There is currently no corresponding measuring device for this test.

Utility model content

The utility model provides a cooling medium flow rate and temperature measuring device for generator efficiency test.

The technical scheme adopted by the utility model is: a water flow and temperature measuring device for generator efficiency test, including a pipeline connecting the generator water inlet pipe and the generator outlet pipe; the pipeline includes a first connecting pipe connected with the generator water inlet pipe Part, the instrument test section connected with the first connection part and the second connection part connected with the generator outlet pipe; there is a temperature measuring platinum resistance between the first connection part and the instrument test section; the instrument test section includes the front straight pipe section in turn , flow meter, rear straight pipe section, throttle valve and exhaust hole.

Further, the pipeline is U-shaped or Ω-shaped.

Further, the first connecting part is also provided with a transition hose.

Further, the first connection part is connected to the instrument test section through a first throttle tapered pipe, and the instrument test section is connected to the second connection part through a second throttle tapered pipe.

Further, at least one height-adjustable pipe installation bracket is also provided for supporting the pipe.

Further, an extension pipe is also provided between the transition hose and the instrument test section.

Further, the first connecting part is connected to the water inlet pipe of the generator through a first flange elbow, wherein the flanges at both ends of the elbow have different sizes.

Further, the second connection part is connected to the water outlet pipe of the generator through a second flange elbow, wherein the flanges at both ends of the elbow have different sizes.

Further, the temperature-measuring platinum resistance thermometer, the flow meter and the throttle valve are all arranged on the pipeline through an elbow with a flange.

The beneficial effects of the utility model are:

(1) In the utility model, the cooling water is transformed through the flange elbow, and then through the action of the throttling conical tube and the throttling valve to make the flow rate uniform and fill the measuring pipeline; after decreasing the throttling, the flow rate is increased to increase the flow rate measurement accuracy;

(2) The utility model can adjust the size of the water flow through the throttling valve and the throttling tapered pipe. After the diameter of the pipe at the measuring end of the instrument is successively reduced, the Reynolds number is within a certain range, and the water flow is uniform and kept in a laminar flow state. When the throttle valve is adjusted to reduce the water flow rate, the outlet water temperature will increase, improving the measurement accuracy of temperature difference;

(3) The utility model can be used for the efficiency test of motors such as steam turbine generators, nuclear power generators and hydroelectric generators with water as the secondary cooling medium, and has good promotion and application value.

Description of drawings

Fig. 1 is a front view of the utility model.

Fig. 2 is a schematic diagram of the vertical installation of the utility model.

Figure 3 is a schematic diagram of horizontal installation.

Fig. 4 is a schematic diagram of the structure of the pipeline installation bracket in the utility model.

In the figure: 1-generator water inlet pipe, 2-first flange elbow, 3-transition hose, 4-extension pipe, 5-temperature measuring platinum resistance, 6-front straight pipe section, 7-flow meter, 8- Rear straight pipe section, 9-throttle valve, 10-pipe mounting bracket, 11-exhaust hole, 12-second flange elbow, 13-generator outlet pipe.

detailed description

Below in conjunction with accompanying drawing and specific embodiment the utility model is described further.

As shown in Figures 1-3, a water flow and temperature measuring device used for the efficiency test of a generator set includes a pipeline connecting the generator water inlet pipe 1 and the generator water outlet pipe 13; A connection part, the instrument test section connected with the first connection part and the second connection part connected with the generator outlet pipe 13; a temperature-measuring platinum resistance 5 is arranged between the first connection part and the instrument test section; the instrument test section sequentially It includes a straight pipe section 6 at the front end, a flow meter 7 , a straight pipe section 8 at the rear end, a throttle valve 9 and an exhaust hole 11 .

When in use, the cooling water enters the generator outlet pipe 13 from the generator water inlet pipe 1 through the first connection part, the temperature measuring platinum resistor 5, the instrument test section and the second connection part, and first discharges the excess water in the pipe through the exhaust hole 11. Air; the water in the pipeline of the instrument test section is converted and flows through the straight pipe section 6 at the front end, and then through the throttle valve 9, the flow rate is uniform and parallel to the axis of the streamline; the outlet temperature T ₁ of the cooling water is measured, and the cooling The temperature of water before entering the generator is T ₀ , and its temperature difference is T ₁ -T ₀ .

During the generator efficiency test, the loss generated by the motor is taken away by the cooling water. According to the 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 rate, m ³ /h;

T ₁ is the outlet water temperature, °C;

T ₀ is the inlet water temperature, °C.

Further, the pipe is U-shaped or Ω-shaped; the pipe can also be in other shapes suitable for specific conditions, and the size and type of the pipe are different, and the diameter of the pipe will be reduced correspondingly after passing through the elbow flange and the measuring end of the instrument.

Further, the first connection part is also provided with a transition hose 3; the transition hose 3 can be used to adapt to different connection distances and heights.

Further, the first connection part and the instrument test section are connected through a first throttle conical tube, and the instrument test section and the second connection part are connected through a second throttle conical tube; the cooling water passes through the first After the role of the throttling conical pipe, it reaches the instrument test section, and then enters the generator outlet pipe 13 through the second connecting part after being amplified by the second conical throttling pipe; the flow velocity can be made more uniform and the measurement error can be reduced.

Further, at least one height-adjustable pipeline installation bracket 10 is also provided for supporting the pipeline; by setting the pipeline installation bracket 10, the placement height of the test pipeline can be adjusted more conveniently to adapt to different pipelines.

Further, an extension pipe 4 is provided between the transition hose 3 and the instrument test section.

Further, the first connection part is connected to the water inlet pipe 1 of the generator through the first flange elbow 2 .

Further, the second connection part is connected to the water outlet pipe 13 of the generator through the second flange elbow 12 .

Further, the temperature measuring platinum resistor 5, the flow meter 7 and the throttle valve 9 are all arranged on the pipeline through an elbow with a flange.

After the water passes through the action of the flange elbow, throttle tapered tube, and throttle valve 9, its flow velocity is uniform and parallel to the streamline of the axis; the utility model can effectively adjust the flow of cooling water, and the speed of the water flow can still meet the Reynolds number The limit value reaches the full pipe and is in a laminar flow state; and through twice decreasing throttling, the flow rate decreases, the temperature difference between the cooling water inlet and outlet is increased, the measurement error is reduced, the flow rate and temperature measurement accuracy are improved, and the efficiency test is improved. Accuracy; the utility model is used for the cooling medium parameter measurement device of the generator efficiency test. One end of the device is a 90° flange, and the other end is a flange with a hose, which can adapt to different connection distances and angles; it can accurately measure The flow rate and temperature of the cooling medium can accurately calculate the loss of the motor. It can be used to measure the loss taken by coolers such as air, thrust bearings, and guide bearings. It can also be used for steam turbine generators, nuclear power generators, and hydroelectric generators. The motor efficiency test with water as the secondary cooling medium has good promotion and application value.

Claims (9)

1. A water flow and temperature measuring device for generator efficiency test, is characterized in that: comprise the pipeline that connects generator water inlet pipe (1) and generator water outlet pipe (13); Pipeline comprises and generator water inlet pipe (1) ) connected to the first connection part, the instrument test section connected with the first connection part and the second connection part connected with the generator outlet pipe (13); a temperature measuring platinum resistance thermometer is arranged between the first connection part and the instrument test section (5); the instrument test section successively includes a front straight pipe section (6), a flow meter (7), a rear end straight pipe section (8), a throttle valve (9) and an exhaust hole (11). 2. A water flow and temperature measuring device for generator efficiency test according to claim 1, characterized in that: said pipeline is U-shaped or Ω-shaped. 3. The water flow and temperature measuring device for generator efficiency test according to claim 1, characterized in that: the first connecting part is also provided with a transition hose (3). 4. A water flow and temperature measuring device for generator efficiency test according to claim 1, characterized in that: said first connection part and the instrument test section are connected by a first throttling tapered pipe, The instrument test section is connected with the second connection part through the second throttling tapered pipe. 5. A water flow and temperature measuring device for generator efficiency test according to claim 1, characterized in that: at least one height-adjustable pipe mounting bracket (10) is provided for supporting the pipe. 6. A water flow and temperature measuring device for generator efficiency test according to claim 3, characterized in that: an extension pipe (4) is also arranged between the transition hose (3) and the instrument test section . 7. A device for measuring water flow and temperature in generator efficiency test according to claim 1, characterized in that: the first connection part is connected to the generator water inlet pipe ( 1). 8. A kind of water flow and temperature measuring device for generator efficiency test according to claim 1, characterized in that: the second connection part is connected to the generator outlet pipe ( 13). 9. A kind of water flow and temperature measuring device for generator efficiency test according to claim 1, characterized in that: said temperature measuring platinum resistance thermometer (5), flow meter (7) and throttle valve (9) All are set on the pipeline through the elbow with flange.