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A cold and hot water level balance method for heat meter durability cold and hot shock test

A technology of durability test and cold and heat shock, which is applied in the field of cold and hot water level balance of heat meter durability cold and heat shock test based on Newton's iterative method, can solve the problems of waste test effectiveness and reduction, and achieve the purpose of strengthening automatic control ability, The effect of ensuring temperature stability and improving monitoring capabilities

Active Publication Date: 2019-12-31
陕西省计量科学研究院
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This will cause the entire test to be stopped and the water level to be manually balanced, resulting in a waste of time and manpower and a significant reduction in the effectiveness of the test

Method used

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  • A cold and hot water level balance method for heat meter durability cold and hot shock test
  • A cold and hot water level balance method for heat meter durability cold and hot shock test
  • A cold and hot water level balance method for heat meter durability cold and hot shock test

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Embodiment 1

[0076]When using the heat meter durability test device of this embodiment to carry out 4000 thermal shock tests on the heat meter, the selected heat meter is a grade 3 DN25 heat meter, and the method for balancing the cold and hot water levels during the test is as follows:

[0077] (1) Take the sampling period t s = 5s is the interval pair durability test process state parameter;

[0078] (2) Establish a data set of test process state parameters, record the current sampling times as k, k≥1; sampling time t=kt s ;Cold and hot water flow through the test pipeline from the water pump until it returns to the water tank, the specific test pipeline L pip =15.0m, 4000 times of hot and cold impact instantaneous flow Q=7.0m 3 / s, 4000 thermal shock cycles T 0 =300s, therefore, the test flow rate is:

[0079]

[0080] Therefore, the time T taken for hot or cold water to come out and finally flow back to the hot or cold water tank d for

[0081]

[0082] (3) Determine whethe...

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Abstract

The invention relates to a cold and hot water level balancing method of a heat meter durability cold and hot impact test. The cold and hot water level balancing method of a heat meter durability coldand hot impact test includes the steps: collecting state parameters of a heat meter durability test process by taking a sampling period ts as the time interval; and establishing a test process state parameter data set, determining whether a hot water tank level data set Lhot of the step (2) is between the highest liquid level and the lowest liquid level of the hot water tank and whether a cold water tank liquid level data set Lcold is between the highest liquid level and the lowest liquid level of the cold water tank, and adjusting an inlet valve for the hot water tank, an outlet valve for thehot water tank, an inlet valve for the cold water tank and an outlet valve for the cold water tank to achieve the liquid level balance of the hot and cold water tank. The cold and hot water level balancing method of a heat meter durability cold and hot impact test effectively avoids the defect that one water tank overflows and one water tank is short of water due to the accumulative effect, and ensures the respective temperature stability of the hot and cold water tanks, so as to enable the test conditions of the platform to strictly follow the heat meter durability cold and hot impact test.

Description

technical field [0001] The invention belongs to the technical field of heat meter measurement, and in particular relates to a method for balancing cold and hot water levels in a heat meter durability cold and heat shock test based on the Newton iteration method. Background technique [0002] In our country, it has been more than ten years since the actual use of heat meters for household measurement has been piloted, and the number of installed and used heat meters has become very large. Judging from the daily testing statistics, the problems in the quality of heat meter products are mainly manifested in the long-term reliability. Regarding the durability research of heat meters, the specific tests mainly include 2400h basic durability test, 300h additional durability test and 4000 times thermal shock test, and the accumulated data is not very sufficient. In China, the 2400h basic durability test and the 300h additional durability test have national standards, but the 4000-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K19/00
CPCG01K19/00
Inventor 李锋周秉直李博张俊亮李宁韩婉婷马军
Owner 陕西省计量科学研究院
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