Dynamic water pressure measuring device

Abstract

The utility model discloses a dynamic water pressure measuring device. Comprising a shell, an end cover used for sealing the shell, a bearing plate located outside the shell and used for bearing dynamic water pressure, and a strain gauge arranged inside the shell and used for measuring the dynamic water pressure. The connecting rod is fixedly connected with the bearing plate, and one end of the connecting rod extends into the shell and is used for triggering the strain gauge; and the reset spring is arranged in the shell and is used for resetting the bearing plate. According to the utility model, the bearing plate is directly contacted with mud-containing water flow, the hysteresis effect caused by a permeable structure of a traditional water pressure sensor can be eliminated, the precision of a measurement result can be improved, the bearing plate does not influence the measurement result due to mud accumulation, and the overall practicability can be improved; according to the utility model, the reset spring is arranged, so that the bearing plate can be quickly reset, and the overall response speed and the measurement precision can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a measuring device, especially a kind of dynamic water pressure measuring device. BACKGROUND

[0002] In dam model test or other hydraulic, hydrological monitoring, the water pressure of mud-containing water flow is often measured, and the existing water pressure sensor is mainly used for static water pressure test, and there is certain measurement error in dynamic water pressure measurement, which is mainly determined by its structural characteristics, a water-permeable stone or other water-permeable structure is arranged between the pressure-sensitive part and the water contact part of general water pressure sensor, and the influence of water-permeable structure on water pressure is smaller in static measurement, but it is not the same in dynamic condition, and the hysteresis effect of water-permeable structure will lead to smaller measurement result;On the other hand, the water pressure sensor with water-permeable structure has no problem in measuring clear water pressure, but when measuring the dynamic water pressure of mud-containing water, the following problems exist: such as dam test needs to judge the influence of water pressure on dam body erosion speed, needs to detect the dynamic water pressure of mud water, and the deposition of slurry on water-permeable structure will cause the blockage of sensor water-permeable structure, so that subsequent measurement cannot be carried out. CONTENT OF THE UTILITY MODEL

[0003] The utility model aims at providing a dynamic water pressure measuring device which can improve the accuracy of measurement results and is suitable for mud-containing water.

[0004] Technical scheme: the utility model discloses a dynamic water pressure measuring device, which comprises a shell, an end cover for closing the shell 1, a pressure-bearing plate located outside the shell and used for bearing dynamic water pressure, a strain gauge arranged in the shell and used for measuring dynamic water pressure, a connecting rod fixedly connected with the pressure-bearing plate and extending to the inside of the shell for triggering the strain gauge, and a reset spring arranged in the shell for resetting the pressure-bearing plate.

[0005] Further, the inside of the shell is fixedly connected with a partition plate for the sliding penetration of the connecting rod, the reset spring is located between the partition plate and the end cover, and the fixed end of the reset spring is fixedly connected with the partition plate, and the free end is fixedly connected with the connecting rod.

[0006] Further, the partition plate and one side of the end cover are both provided with a waterproof sealing ring.

[0007] Further, the waterproof sealing ring is provided as V-shaped structure, and the gap between the waterproof sealing ring and the corresponding partition plate or end cover is filled with butter for improving sealing performance.

[0008] Further, the inside of the shell is further provided with a spring pressing plate fixedly connected with the connecting rod, and the free end of the reset spring is fixedly connected with the spring pressing plate.

[0009] Further, the inside of the shell is fixedly connected with a membrane capable of deforming, two strain gauges are arranged, and the two strain gauges are symmetrically installed on the two sides of the membrane, and the top end of the membrane extends above the strain gauges and can contact the connecting rod.

[0010] Further, the side of the shell close to the pressure bearing plate is fixedly connected with a guide fence, and the pressure bearing plate is located inside the guide fence and is in sliding connection with the guide fence.

[0011] Further, the guide fence comprises a plurality of support rods fixedly connected with the side wall of the shell and a positioning ring fixedly connected with the other ends of the plurality of support rods.

[0012] Further, a plurality of inclined bracing rods for improving stability are fixedly connected between the pressure bearing plate and the connecting rod.

[0013] Advantages: Compared with the prior art, the pressure bearing plate of the utility model directly contacts with the water flow containing mud, can eliminate the hysteresis effect caused by the water permeable structure of the traditional water pressure sensor, is beneficial to improving the accuracy of the measurement result, and the pressure bearing plate will not affect the measurement result due to the accumulation of soil, which is beneficial to improving the overall practicability; the setting of the reset spring can quickly reset the pressure bearing plate, which is beneficial to improving the overall response speed and measurement accuracy; the strain gauge and the reset spring of the utility model are located in the sealed cavity of the shell, which is not only beneficial to prolonging the service life of the whole, but also can assist in improving the measurement accuracy of the whole. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a structural schematic view of the utility model;

[0015] Figure 2 It is a structural schematic view of the utility model; Figure 1 It is a sectional view of A-A in the utility model. DETAILED DESCRIPTION

[0016] The technical scheme of the utility model will be further described below in combination with the drawings.

[0017] The utility model discloses a kind of dynamic water pressure measuring devices, such as Figure 1As shown, including the shell 6, diaphragm 1, strain gauge 2, connecting rod 3, pressure plate 5, reset spring 7, guide fence 11 and partition 12. One side of the shell 6 is fixedly connected with the end cover 16 for closing the shell 1, the diaphragm 1 is fixedly installed in the inside of the shell 6, and the diaphragm 1 is made of deformable material, preferably stainless steel material; two strain gauges 2 are provided, and the two strain gauges 2 are symmetrically installed on both sides of the diaphragm 1, and the top end of the diaphragm 1 extends above the strain gauge 2; one end of the connecting rod 3 is located on one side of the diaphragm 1, and the other end of the connecting rod 3 extends to the outside of the shell 6 and is fixedly connected with the pressure plate 5, preferably, a plurality of inclined bracing rods 15 for improving stability are fixedly connected between the pressure plate 5 and the connecting rod 3. When the pressure plate 5 is pushed by the water flow pressure, the diaphragm 1 deforms under the pushing action of the connecting rod 3, and the strain gauge 2 deforms following the deformation of the diaphragm 1.

[0018] The partition 12 is fixedly connected with the inner wall of the shell 6, and the connecting rod 3 slides through the partition 12 and the end cover 16; the reset spring 7 is located between the partition 12 and the end cover 16, and a spring pressing plate 8 is further provided between the partition 12 and the end cover 16, and the spring pressing plate 8 is fixedly connected with the connecting rod 3, and the fixed end of the reset spring 7 is fixedly connected with the partition 12 and the free end is fixedly connected with the spring pressing plate 3. When the pressure plate 5 is pushed by the water flow pressure, the reset spring 7 is compressed, and the compression value of the reset spring 7 corresponds to the pressure borne by the pressure plate 5, the deformation amount of the diaphragm 1 and the strain gauge 2, and when the pressure borne by the pressure plate 5 disappears, the reset spring 7 restores the pressure plate 5 and the connecting rod 3 to the original position.

[0019] Preferably, the partition 12 and the end cover 16 are both provided with a waterproof sealing ring 4, and the waterproof sealing ring 4 is fixed on the side wall of the partition 12 and the shell 6 through a pressing ring 9; the waterproof sealing ring 4 is provided in a V-shaped structure, and the gap between the waterproof sealing ring 4 and the corresponding side wall of the partition 12 or the shell 6 is filled with butter 10 for improving sealing performance. The cooperation of the waterproof sealing ring 4 and the butter 10 can prevent water from entering the inside of the shell 6, which is conducive to protecting the reset spring 7, the diaphragm 1 and the strain gauge 2 etc. located in the inside of the shell 6.

[0020] As Figure 1 and Figure 2As shown, the guide fence 11 is fixedly connected with one side of the end cover 16, and the pressure plate 5 is located inside the guide fence 11 and is slidingly connected with the guide fence 11, that is, the guide fence 11 plays a guiding role on the pressure plate 5, so that the pressure plate 5 moves linearly under the action of water flow, which can assist to improve the overall measurement accuracy. The guide fence 11 is composed of a plurality of support rods 13 and positioning rings 14, one end of the support rod 13 is fixedly connected with the end cover 16, the other end of the support rod 13 is fixedly connected with the positioning ring 14, and the non-closed structure of the guide fence 11 is arranged, so that the impact force of the water flow on the pressure plate 5 is almost not affected by the structure of the guide fence 11, and the water pressure is almost not lost to be applied to the pressure plate 5.

[0021] In actual use, the strain gauge 2 is connected with an external display device for displaying the deformation amount of the strain gauge 2, and the deformation amount of the strain gauge 2 corresponds to the pressure on the pressure plate 5; or different weights of weights are vertically placed on the pressure plate 5 to obtain different strain value outputs, and the corresponding relationship between the strain value and the pressure is input into a computer to establish the one-to-one correspondence between the strain value and the pressure on the pressure plate 5, so that when the water pressure on the pressure plate 5 is measured, the dynamic water pressure value can be directly obtained through internal calibration value conversion.

Claims

1. A device for measuring hydrodynamic pressure, characterized in that: The utility model provides a kind of pressure cell, including shell (6), for closing shell (6) end cover (16), located shell (6) outside and for bearing hydrodynamic pressure pressure plate (5), be arranged in shell (6) inside and for measuring hydrodynamic pressure strain gauge (2), with pressure plate (5) fixed connection and one end extends to shell (6) inside for triggering strain gauge (2) connecting rod (3) and be arranged in shell (6) inside for pressure plate (5) reset reset spring (7).

2. The device of claim 1, wherein: The inside of the shell (6) is fixedly connected with a partition plate (12) through which the connecting rod (3) slides, the reset spring (7) is located between the partition plate (12) and the end cover (16), and the fixed end of the reset spring (7) is fixedly connected with the partition plate (12) and the free end is fixedly connected with the connecting rod (3).

3. The device of claim 2, wherein: The partition plate (12) and one side of the end cover (16) are both provided with a waterproof sealing ring (4).

4. The device of claim 3, wherein: The waterproof sealing ring (4) is provided in a V-shaped structure, and the gap between the waterproof sealing ring (4) and the corresponding partition plate (12) or end cover (16) is filled with butter (10) for improving the sealing performance.

5. The device of claim 2, wherein: The inside of the shell (6) is further provided with a spring plate (8) fixedly connected with the connecting rod (3), and the free end of the reset spring (7) is fixedly connected with the spring plate (8).

6. The device of claim 1, wherein: The inside of the shell (6) is fixedly connected with a diaphragm (1) that can be deformed, the strain gauge (2) is provided with two, and the two strain gauges (2) are symmetrically installed on both sides of the diaphragm (1), the top end of the diaphragm (1) extends above the strain gauge (2) and can contact the connecting rod (3).

7. The device of claim 1, wherein: The side of the shell (6) close to the pressure plate (5) is fixedly connected with a guide fence (11), and the pressure plate (5) is located inside the guide fence (11) and is in sliding connection with it.

8. The device of claim 7, wherein: The guide fence (11) includes a plurality of support rods (13) fixedly connected with the end cover (16) and a positioning ring (14) fixedly connected with the other end of the plurality of support rods (13).

9. The device of claim 1, wherein: A plurality of inclined struts (15) for improving stability are fixedly connected between the pressure plate (5) and the connecting rod.

Images