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Water-stop-free valve resistance measuring device

A technology of measuring device and water valve, which is applied in the direction of measuring device, pressure difference measurement between multiple valves, measuring fluid pressure, etc. Test the effect quickly and easily

Inactive Publication Date: 2010-03-17
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the existing problem that the valve must be cut off after the water is cut off for measurement and the measurement result is inaccurate when measuring the valve resistance, and to provide a valve resistance measurement device without stopping the water

Method used

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  • Water-stop-free valve resistance measuring device
  • Water-stop-free valve resistance measuring device

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Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0007] Specific implementation mode one: combine figure 1 and figure 2 Describe this embodiment, the measuring device of this embodiment includes a first differential pressure sensor 1, a second differential pressure sensor 2 and a Pitot tube 3, each of the two signal input terminals of the first differential pressure sensor 1 inputs The ends are respectively connected with one end of the tested valve 13 installed on the tap water pipe 4. The measuring device also includes a Pitot tube connecting device 5 and a short pipe 12. The Pitot tube connecting device 5 is composed of the first valve 6, the truncated cone rubber Plug 7, nut 8, first flange 9, second flange 10 and external thread sleeve 11, the upper end surface of the first flange 9 is affixed to the lower end surface of external thread sleeve 11, so Said externally threaded sleeve 11 is arranged coaxially with the first flange 9, and the shape of the inner hole of said externally threaded sleeve 11 matches the shape ...

specific Embodiment approach 2

[0008] Specific implementation mode two: combination figure 1 To illustrate this embodiment, the first valve 6 of this embodiment is a single gate valve. The advantage of this structure is that the gate moves outward when the valve is opened, leaving enough space for the smooth insertion of the Pitot tube. Other components and connections are the same as those in the first embodiment.

specific Embodiment approach 3

[0009] Specific implementation mode three: combination figure 1 and figure 2 Illustrate the present embodiment, the Pitot tube 3 of the present embodiment is L-shaped, and the total length of the bent section of the L-shaped Pitot tube 3 bottom is 70cm-90cm. It is suitable for the test of the valve on the tap water pipeline with smaller pipe diameter, and at the same time reduces the caliber of the first valve 6 and reduces the cost. Other components and connections are the same as those in the first embodiment.

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Abstract

The invention discloses a water-stop-free valve resistance measuring device, and relates to a valve resistance measuring device, aiming at solving the problems that the existing measuring device needsto measure the resistance of the valve after the water is stopped and the valve is taken down, and the measurement result is not accurate. The device has the technical scheme that a first flange plate is fixedly connected with an outer thread bushing; a circular truncated cone shaped rubber plug is arranged inside an inner hole of the outer thread bushing; the upper end surface of a first valve is connected with the lower end surface of the first flange plate in a detachable way, and the lower end surface of the first valve is fixedly connected with the upper end surface of a second flange plate; the upper end of a pitot tube sequentially passes through the second flange plate, the first valve, the first flange plate and the circular truncated cone shaped rubber plug and is exposed outside a pitot tube connecting device; the pitot tube is firmly connected with the circular truncated cone shaped rubber plug; the hole measuring end of the pitot tube is arranged inside a tap water pipe;a screw cap is connected with the outer thread bushing by screw thread; a second pressure difference sensor is connected with the pitot tube; and the lower end surface of the second flange plate is fixedly connected with the upper end surface of a short tube which is communicated with the tap water pipe. The device is used for measuring the resistance of the valve on the tap water pipe in an on-line way.

Description

technical field [0001] The invention relates to a valve resistance measuring device. Background technique [0002] The valve controls the fluid by changing its resistance. Due to the difference in valve model, size and laying age, the local resistance generated by the valve will change. Using the Bernoulli equation, the local resistance coefficient of the valve is: (where ξ is the local resistance coefficient, ΔP is the pressure difference between the two test points, g is the acceleration of gravity, and v is the water flow velocity), after measuring the pressure difference, flow velocity and elevation difference of the test points on both sides of the valve to be tested, it can be measured The local resistance coefficient of the valve to be tested at each opening. At present, in the known valve resistance measurement, the valve must be taken off for measurement after the water is cut off. The valve to be dismantled uses an ultrasonic flowmeter to conduct a laboratory w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L13/00
Inventor 高金良
Owner HARBIN INST OF TECH