CN211954292U - Large diameter hot water energy metering system - Google Patents

Abstract

The utility model relates to a large-diameter hot water energy metering system, which comprises a flowmeter, a pressure transmitter, a temperature transmitter, a flow totalizer and a high-temperature exhaust valve; Flowmeter, the rear straight pipe section is provided with a pressure transmitter and four temperature transmitters, and the four temperature transmitters are evenly distributed on the outer ring of the rear straight pipe section; there is a pressure transmitter on the straight pipe section of the large-diameter pipe return pipe Transmitter and four temperature transmitters, four temperature transmitters are distributed on the outer ring of the straight pipe section of the return pipe, flowmeter, two pressure transmitters, and two sets of four-way temperature transmitters are respectively connected Flow totalizer. The utility model uses a plurality of temperature transmitters to measure the temperature value of the hot water in the multi-point pipeline, and finally takes the average value of the temperature, which is more reasonable, does not cause any safety problems such as water leakage, pressure relief, scalding, etc., and has better long-term stability. robustness and reliability, sufficient for trade measurement.

Description

Large diameter hot water energy metering system

technical field

The utility model relates to a large-diameter hot water energy metering system.

Background technique

Hot water is the most widely used heat transfer medium and a very important secondary energy source. The measurement of hot water energy is large and wide, which is of great significance to strengthening management, fair trade, energy saving, and improving economic benefits.

At present, the mainstream hot water energy measurement methods in the world include ultrasonic flowmeter and electromagnetic flowmeter. These two methods have advantages and disadvantages. In addition, differential pressure flow measurement also has applications.

The electromagnetic flowmeter can only measure conductive liquids, and the maximum liquid temperature can reach 130 °C. The measurement accuracy of the differential pressure flowmeter is low, generally not higher than 1.0, the pressure loss is large, and the additional energy consumption is increased.

SUMMARY OF THE INVENTION

The utility model aims to overcome the defects of the prior art, and provides a large-diameter hot water energy metering system without any safety problems such as water leakage, pressure relief, scalding and the like.

In order to solve the above-mentioned technical problems, the utility model is realized in this way:

A large-diameter hot water energy metering system is characterized in that: it includes a flow meter, a pressure transmitter, a temperature transmitter, a flow totalizer, and a high-temperature exhaust valve; A flow meter is provided, and the rear straight pipe section is provided with a pressure transmitter and four temperature transmitters, and the four temperature transmitters are evenly distributed on the outer ring of the rear straight pipe section; There is a pressure transmitter and four temperature transmitters on the pipe section, and the four temperature transmitters are evenly distributed on the outer ring of the straight pipe section of the return pipe. The flowmeter, two pressure transmitters, two sets of four The road temperature transmitter is connected to the flow totalizer respectively.

The large-diameter hot water energy metering system is characterized in that the length of the front straight pipe section of the flowmeter is greater than or equal to 20D, and the length of the rear straight pipe section of the flowmeter is greater than or equal to 5D.

The large-diameter hot water energy metering system is characterized in that: the flowmeter is an ultrasonic flowmeter.

The large-diameter hot water energy metering system is characterized in that: the depths of the straight pipe sections after the four temperature transmitters are inserted are respectively D/2, D/3, 5D/24, and D/12, and they are Lan installation.

The large-diameter hot water energy metering system is characterized in that: a high-temperature automatic exhaust valve is installed at the highest point upstream of the flow meter.

The large-diameter hot water energy metering system is characterized in that: it further comprises a control cabinet, which can be equipped with lightning protection equipment, flow meter converter and UPS power supply according to different requirements.

The beneficial effects of the utility model are: using a plurality of temperature transmitters to measure the temperature value of the hot water in the multi-point pipeline, and finally taking the average value of the temperature, which is more reasonable, and does not cause any safety problems such as water leakage, pressure relief, scalding, etc. Good long-term stability and reliability are sufficient for trade measurement.

Description of drawings

Below in conjunction with accompanying drawing and embodiment, the utility model is described in further detail:

Figure 1 is a schematic structural diagram of the utility model.

Figure 2 is a schematic diagram of the temperature transmitter inserted in the pipeline.

Figure 3 is a schematic diagram of the electrical installation of the system.

Detailed ways

As shown in Figures 1 and 3: a large-diameter hot water energy metering system, which includes a flowmeter 1, a pressure transmitter 2, a temperature transmitter 3, a flow totalizer 4, and a high-temperature exhaust valve 5; the The diameter D of the large-diameter pipeline 6 is 350mm-1400mm; a flowmeter 1 is arranged in the middle of the straight pipe section of the water outlet pipe of the large-diameter pipeline. equal to 5D, the rear straight pipe section 62 is provided with a pressure transmitter 2 and four temperature transmitters 3, and the four temperature transmitters 3 are evenly distributed on the outer ring of the rear straight pipe section; the large-diameter pipe return pipe A pressure transmitter 2 and four temperature transmitters 3 are arranged on the straight pipe section of 7 , and the four temperature transmitters 3 are evenly distributed on the outer ring of the straight pipe section of the return water pipeline 7 . The flowmeter 1, two pressure transmitters 2, and two sets of four-way temperature transmitters 3 are respectively connected to the flow totalizer 4, which can finally display mass flow and energy, and has 2 channels 4 -20mA output is used for heating power plants and heating companies and 1 channel RS485 signal backup. The electrical installation of the hot water energy metering system is also very important. For example, the strong current and the weak current must be connected in separate casings to avoid the interference of the strong current to the weak current signal; The casing must be galvanized carbon steel pipe to avoid external electromagnetic interference and rodents gnawing on the cable.

Further, the flowmeter 1 is an ultrasonic flowmeter, which has a significant function of online installation and plugging of ultrasonic probes. Once a problem occurs with the instrument probe, it can be installed online without any safety problems such as water leakage, pressure relief, and burns.

Further, due to the particularly large diameter of the flowmeter, it is problematic to use a single temperature transmitter commonly used in the past to measure temperature. Because of the large diameter and the low temperature in the environmental conditions, there must be a temperature gradient difference in the large diameter pipeline. Therefore, our measurement plan is to use multiple temperature transmitters to measure the temperature of hot water in the multi-point pipeline, and finally take the average temperature, as shown in Figure 2: the four temperature transmitters 3 are inserted into the straight pipe section The depths are D/2, D/3, 5D/24, D/12, respectively, and are installed through flanges. For example, when the diameter of the large-diameter pipe 6 is 1200mm, the insertion depths of the four temperature transmitters 3 are respectively 600mm, 400mm, 250mm, 100mm.

Further, a high-temperature automatic exhaust valve is installed at any of the highest points upstream of the flow meter 1 to remove the air in the pipeline, because hot water is easier to release air from the liquid than cold water. Otherwise, it will cause the flowmeter to fluctuate and the indication value is too large.

Further, the flow meter 1 is installed at the lowest part of the system to avoid the entry of air, which will lead to the flow of the non-full pipe and bring unnecessary additional errors.

Further, the system also includes a control cabinet, which can be equipped with lightning protection equipment, flow meter converter, and UPS power supply according to different requirements. In order to prevent the sudden power failure of the entire energy metering system, it is necessary to use UPS uninterruptible power supply to ensure the timely preservation of data information and emergency repair work for power failure. If the entire hot water energy metering system is installed in a remote or lightning-prone place, lightning protection measures must be taken to avoid major instrument loss and interruption of signal transmission.

Claims (6)

1. A large-caliber hot water energy metering system is characterized in that: the device comprises a flowmeter, a pressure transmitter, a temperature transmitter, a flow integrating instrument and a high-temperature exhaust valve; the middle part of the straight pipe section of the large-caliber pipeline water outlet pipeline is provided with a flowmeter, the rear straight pipe section is provided with a pressure transmitter and four temperature transmitters, and the four temperature transmitters are uniformly distributed on the outer ring of the rear straight pipe section; the large-caliber pipeline water return pipeline is characterized in that a pressure transmitter and four temperature transmitters are arranged on the straight pipe section of the large-caliber pipeline water return pipeline, the four temperature transmitters are uniformly distributed on the outer ring of the straight pipe section of the water return pipeline, and the flowmeter, the two pressure transmitters and the two sets of four temperature transmitters are respectively connected into the flow integrating instrument.

2. The large caliber hot water energy metering system of claim 1, wherein: the length of the front straight pipe section of the flowmeter is more than or equal to 20D, and the length of the rear straight pipe section of the flowmeter is more than or equal to 5D.

3. The large caliber hot water energy metering system of claim 1, wherein: the flowmeter is an ultrasonic flowmeter.

4. The large caliber hot water energy metering system of claim 1, wherein: the depths of the four temperature transmitters inserted into the straight pipe section are respectively D/2, D/3, 5D/24 and D/12, and the four temperature transmitters are installed through flanges.

5. The large caliber hot water energy metering system of claim 1, wherein: the highest point at the upstream of the flowmeter is provided with a high-temperature automatic exhaust valve.

6. The large caliber hot water energy metering system of claim 1, wherein: the intelligent control cabinet also comprises a control cabinet, and lightning protection equipment, a flowmeter converter and a UPS power supply can be arranged according to different requirements.

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