CN103792038A - Flow limit clamp for piezometric tube - Google Patents

Abstract

The present invention is a current-limiting clamp for piezometric tubes, which includes an upper splint, a lower splint, and a rotating part arranged between the upper splint and the lower splint for relative rotation of the upper splint and the lower splint to clamp the pressure-measuring tube to be limited. The upper splint and/or the lower splint is provided with at least one flow-limiting groove for clamping and fixing the pressure measuring tube to be limited, and the upper splint and/or the lower splint is also provided with a gap between the upper splint and the lower splint. Spacing adjustment assembly for clamping pitch. Since the flow limiting groove is a concave structure penetrating through the wall surface, when the pressure measuring tube to be limited is clamped, the pressure transmission channel of the pressure measuring tube will not be completely closed, but only compress the transmission channel, forming a temporary current limitation The clamping position can be adjusted arbitrarily to form flow limiters at different parts of the pressure measurement tube, and the temporary flow limiter setting is simple and convenient.

Description

Restrictor clips for piezometric tubes

technical field

The invention relates to the technical field of pressure testing equipment, in particular to a flow-limiting clip for a pressure measuring tube.

Background technique

The measurement of surface pressure has a wide range of applications in machinery, civil engineering, transportation and other fields. In many engineering applications (large buildings, aircraft, high-speed trains, etc.), it is necessary to know the instantaneous wind pressure on the surface of the measured object. Based on this, the instantaneous aerodynamic force on the structure can be calculated, and the vibration response of the structure can be calculated, such as the data concerned in engineering. However, due to the presence of a certain length of pressure measurement pipeline in the pressure measurement system, the transient pressure on the surface of the object (that is, the pulsating pressure that changes with time) can only reach the scanning valve after passing through the pipeline. The transmission of the pressure wave through the pipeline will be distorted due to the damping effect of the pipeline, that is to say, the pressure sensed by the scanning valve is not completely consistent with the surface pressure of the model, and the amplitude and phase of the pressure signal will change. That is, the pressure measured by the scanning valve is not the real pressure on the surface of the model, but the pressure after the distortion of the pipeline.

The distortion generated by the pressure passing through the pressure measuring tube is related to the natural frequency of the air column in the tube, that is, the "frequency response characteristic". Generally, the longer the piezometric tube length and the larger the inner diameter, the more significant the distortion will be. For a certain length and inner diameter of the pressure measuring pipeline, distortion is also affected by the pulsation frequency of the measured pressure signal itself. When the pulsation frequency of the measured pressure is much smaller than the natural frequency of the pipeline, the signal distortion is not obvious; and when the pulsation frequency of the measured pressure is close to the natural frequency of the pipeline (resonance will be generated in the pipeline), the signal distortion will be very significant, the main performance The amplitude of the pressure fluctuation at the end of the pipeline is much larger than that at the inlet of the pipeline (that is, the original pressure signal). At the same time, the phase of the pressure pulsation at the end of the pipeline lags behind the original pressure signal, and the phase lag becomes more significant as the signal frequency increases. In order to improve the frequency response characteristics of the piezometric pipeline, the natural frequency of the pipeline should be increased as much as possible to expand the frequency range with less distortion. At present, the usual practice is to connect a small section of small steel pipes with a very small inner diameter (about 0.4mm) in series at an appropriate position in the pipeline to increase the resonance frequency of the piezometric pipeline, so as to achieve the purpose of improving the frequency response characteristics. This kind of small steel pipe with extremely small inner diameter that is inserted into the pressure measuring pipeline is called a "flow restrictor". Inserting a flow restrictor with a very small inner diameter in series in the piezometric pipe is the most widely used method to improve the frequency response of the pipe in the wind tunnel synchronous piezometric experiment.

This method has the following problems:

(1) Adding a flow restrictor requires cutting the original pressure measuring pipeline, which brings inconvenience to the experimental operation;

(2) Once the piezometric pipe is cut and installed with a flow restrictor, its position cannot be adjusted (because the position of the flow restrictor affects the frequency response improvement of the piezometric pipe);

(3) Once the length of the restrictor is determined, it cannot be adjusted;

(4) If multiple restrictors are to be installed in the same pipeline, the pipeline needs to be cut in multiple places, which may cause poor sealing of the pressure measuring tube;

(5) The inner diameter of the restrictor itself cannot be adjusted (the inner diameter of the restrictor will also affect the frequency response characteristics of the piezo tube).

Contents of the invention

Aiming at the shortcomings of the current limiting method of the piezometric tube, a current limiting clip for the piezometric tube is provided, which uses a structure similar to a "clip" from the outside of the piezometric tube to partially flatten the piezometric tube, but ensures that it will not be completely sealed. The delivery pipeline of the piezometric tube is dead, so that the short section of the pipeline that is crushed can act like a flow limiter, without cutting the piezometer tube, and the length and position of the flow limit can be adjusted arbitrarily. There are several grooves on the inner side of the current limiting clamp, and the pressure measuring tube can be fixed in the groove. By adjusting the clamping degree of the current limiting clamp, the effect of the current limiter can be realized conveniently. By adjusting the clamping tightness, the effect of flattening the piezometric tube can be achieved, and the same effect as a current limiter can be achieved to achieve the purpose of adjusting the frequency response of the piezo tube.

In order to achieve the above object, specific technical solutions of the present invention:

A current-limiting clip for a piezometric tube, comprising an upper splint, a lower splint, and a rotating member arranged between the upper splint and the lower splint for relative rotation of the upper splint and the lower splint to clamp the pressure-measuring tube to be limited, the upper splint and the lower splint. /or the lower splint is provided with at least one flow-limiting groove for clamping and fixing the pressure measuring tube to be limited, and the upper splint and/or the lower splint are also provided with a clamping distance between the upper splint and the lower splint spacing adjustment components. The relative rotation between the upper clamping plate and the lower clamping plate is realized by the rotating member. The upper clamping plate and the lower clamping plate hold or release the pressure measuring tube to be limited by current limitation through relative rotation. The current-limiting pressure measuring tube to be clamped and fixed is carried out through the through flow-limiting groove on the upper splint and/or the lower splint. Through the concave structure of the flow limiting groove, the pressure transmission channel in the pressure measuring tube to be limited in the clamping process will only be partially narrowed and will not be completely closed.

Preferably, the spacing adjustment assembly includes a first screw hole opened on the upper clamping plate, a second screw hole opened on the lower clamping plate, and connected to the first screw hole and the second screw hole to adjust the distance between the upper clamping plate and the lower clamping plate. Screws with a clamping distance between them, the first screw hole, the second screw hole and the screws are set in a matching manner.

Preferably, the spacing adjustment assembly includes a first sawtooth on the edge of the upper plywood and a hanging edge with second sawtooth on the edge of the lower plywood. The relative positions of the sides are adjusted and fixed by the matching first sawtooth and second sawtooth to adjust the clamping distance between the upper splint and the lower splint.

Preferably, the flow limiting groove is parallel to the rotation axis of the rotating member.

Preferably, both the upper splint and the lower splint are provided with flow-limiting grooves, and the flow-limiting grooves on the upper splint and the flow-limiting grooves on the lower splint are arranged correspondingly.

Preferably, the upper clamping plate and/or the lower clamping plate are provided with multiple flow limiting grooves, and the multiple flow limiting grooves are parallel to each other.

Preferably, the cross-sectional size of the flow-limiting groove close to the rotating part is larger than the cross-sectional size of the flow-limiting groove away from the rotating part.

Preferably, the edge of the upper splint is connected to the edge of the lower splint through a rotating member.

Preferably, the edge of the upper splint is connected to the middle of the lower splint through a rotating member.

Preferably, the upper splint and the lower splint are spaced apart, and the middle part of the upper splint is connected with the middle part of the lower splint through a rotating member.

Another specific technical solution of the present invention:

A current-limiting clip for a piezometric tube, comprising an upper splint and a lower splint, the upper splint and the lower splint are arranged in parallel and at intervals, and at least one is provided on the upper splint and/or the lower splint for clamping and fixing the pressure measuring tube to be limited. Through the flow limiting groove, the upper splint and/or the lower splint are also provided with a spacing adjustment assembly for adjusting the clamping distance between the upper splint and the lower splint.

Preferably, the spacing adjustment assembly includes a first screw hole opened on the upper clamping plate, a second screw hole opened on the lower clamping plate, and connected to the first screw hole and the second screw hole to adjust the distance between the upper clamping plate and the lower clamping plate. Screws with a clamping distance between them, the first screw hole, the second screw hole and the screws are set in a matching manner.

Preferably, the spacing adjustment assembly includes a first sawtooth on the edge of the upper plywood and a hanging edge with second sawtooth on the edge of the lower plywood. The relative positions of the sides are adjusted and fixed by the matching first sawtooth and second sawtooth to adjust the clamping distance between the upper splint and the lower splint.

The beneficial effects of the patent of the present invention are:

1. There is no need to cut the pressure measuring tube, and the installation and removal of the current limiting clamp are very convenient;

2. The clamping position of the current limiting clamp on the pressure measuring tube can be adjusted at will to realize the function of adjusting the position of the current limiting device;

3. The tightening degree of the current limiting clamp can be adjusted arbitrarily through the spacing adjustment component to realize the adjustment and optimization of the frequency response of the piezo tube;

4. Multiple current limiting clamps can be conveniently installed on the piezometric tube to realize the adjustment of the frequency response of the piezo tube by multiple current limiters;

5. One current limiting clip can have multiple grooves, and one current limiting clip can adjust the frequency response of multiple piezometric tubes at the same time;

6. The length of the current limiting clamp can have various sizes, and the current limiting clamps of several lengths can be used together, which can conveniently realize the optimization of frequency response adjustment;

7. The current limiting clamp can be used repeatedly;

8. When the number of piezometric tubes is large (the number of piezometric tubes sometimes reaches several hundred in the simultaneous piezometric experiment, it will be very messy if not sorted out), the current limiting clamp described in the present invention can also play a role in controlling the pressure of the piezometric tubes. The effect of grouping.

Below in conjunction with accompanying drawing, patent of the present invention is described further.

Description of drawings

Fig. 1 is one of the structural schematic diagrams of the restrictor clamp for piezo tube according to the embodiment of the present invention;

Fig. 2 is the second structural schematic diagram of the flow limiting clip for the piezo tube according to the embodiment of the present invention;

Fig. 3 is the third schematic diagram of the structure of the flow limiting clip for the piezo tube according to the embodiment of the present invention.

illustration:

1. Upper splint; 2. Lower splint; 3. Rotating member; 4. Flow limiting groove; 5. Spacing adjustment component; 501. First screw hole; 502. Second screw hole; 503. Screw; 504. First sawtooth ; 505, the second sawtooth; 6, hanging edge.

Detailed ways

The following is a further description of the technical content of the patent of the present invention, but it is not a limitation to the essential content of the patent of the present invention.

Fig. 1 is one of the structural schematic diagrams of the current-limiting clamp for the piezometric tube of the embodiment of the present invention; Fig. 2 is the second structural schematic diagram of the current-limiting clamp for the piezo-testing tube of the embodiment of the present invention; Fig. 3 is the pressure measurement of the embodiment of the present invention The third schematic diagram of the structure of the current limiting clamp for pipes.

As shown in Figures 1 and 2, the current-limiting clamp for piezometric tubes includes an upper splint 1, a lower splint 2, and is arranged between the upper splint 1 and the lower splint 2 to allow the relative rotation of the upper splint 1 and the lower splint 2 to be limited. The rotating part 3 of the flow pressure measuring tube, the upper clamping plate 1 and/or the lower clamping plate 2 is provided with at least one through flow limiting groove 4 for clamping and fixing the pressure measuring tube to be limited, the upper clamping plate 1 and/or the lower clamping plate 2 is also provided with a spacing adjustment assembly 5 for adjusting the clamping distance between the upper splint 1 and the lower splint 2 . Relative rotation is realized between the upper splint 1 and the lower splint 2 through the rotating member 3 , and the rotating member 3 is used as a rotating shaft between the upper splint 1 and the lower splint 2 . The upper splint 1 and the lower splint 2 are clamped and fixed by the flow-limiting groove 4 opened on the upper splint 1 and/or the lower splint 2. The current-limiting pressure-measuring tube is arranged along the flow-limiting groove 4 Orientation settings. Since the flow limiting groove 4 is a concave structure penetrating through the wall surface, when the pressure measuring tube to be limited is clamped, the pressure transmission channel of the pressure measuring tube will not be completely closed, and it only plays the role of compressing the transmission channel, forming a temporary limitation. streamer. The current limiting clamp will not damage the shape and structure of the piezometric tube, can be used repeatedly, and the clamping position can be adjusted arbitrarily to form a current limiter on different parts of the piezometric tube, and the setting of the temporary current limiter is simple and convenient. The clamping distance between the upper clamping plate 1 and the lower clamping plate 2 can be adjusted arbitrarily through the spacing adjustment assembly 5 to adjust the radial dimension of the transmission channel of the pressure measuring tube.

As shown in Figure 1, it is also that the distance adjustment assembly 5 includes a first screw hole 501 opened on the upper clamping plate 1, a second screw hole 502 opened on the lower clamping plate 2, and a connection between the first screw hole 501 and the second screw hole 502. The screw 503 on the second screw hole 502 is used to adjust the clamping distance between the upper splint 1 and the lower splint 2 , and the first screw hole 501 , the second screw hole 502 and the screw 503 are matched. The two ends of the screw 503 are respectively matched and connected to the first screw hole 501 and the second screw hole 502. The screw 503 mobilizes the upper splint 1 by adjusting the relative position with the first screw hole 501. The screw 503 adjusts the position with the second screw hole 502. The lower splint 2 is adjusted relative to the position, thereby adjusting the distance between the upper splint 1 and the lower splint 2 at the position of the screw 503, so as to realize the adjustment of the radial dimension of the pressure transmission channel in the flow-limited piezometric tube.

As shown in Figure 2, it also lies in that the spacing adjustment assembly 5 includes a first sawtooth 504 on the edge of the upper splint 1 and a hanging edge 6 with a second sawtooth 505 on the edge of the lower splint 2, the first sawtooth 504 is matched with the second sawtooth 505, and the relative position of the plate edge of the upper splint 1 and the hanging edge 6 is adjusted and fixed by the matching first sawtooth 504 and second sawtooth 505 to adjust the clamping between the upper splint 1 and the lower splint 2 spacing. The upper splint 1 adjusts the relative position of the upper splint 1 on the hanging edge 6 through the clamping of the first sawtooth 504 and the second sawtooth 505 on the edge of the plate, thereby adjusting the upper splint 1 and the lower splint 2 at the hanging edge 6 The distance between them can realize the adjustment of the radial size of the pressure transmission channel in the pressure measuring tube to be restricted.

As shown in FIGS. 1 , 2 and 3 , it is further that the flow limiting groove 4 is parallel to the rotation axis of the rotating member 3 . The flow limiting groove 4 intersects the rotation axis of the rotating member 3 . The upper splint 1 and the lower splint 2 are arranged at intervals, and the flow limiting groove 4 is perpendicular to the rotation axis of the rotating member 3 . By changing the relative position of the flow-limiting groove 4 and the rotation axis of the rotating member 3, different clamping modes of the current-limiting clamp to treat the current-limiting pressure measuring tube are formed, so that the applicable range of the current-limiting tube is wider.

As shown in FIG. 1 , it is furthermore that the upper splint 1 and the lower splint 2 are provided with flow limiting grooves 4 , and the flow limiting grooves 4 on the upper splint 1 and the flow limiting grooves 4 on the lower splint 2 are arranged correspondingly. The upper and lower corresponding flow-limiting grooves 4 are arranged, and when clamping and fixing the pressure measuring tube to be limited, the radial dimension of the pressure transmission channel changes uniformly, the flow-limiting effect is better, and the control is more convenient.

As shown in Figures 1, 2, and 3, it is furthermore that the upper splint 1 and/or the lower splint 2 are provided with a plurality of flow-limiting grooves 4, and the plurality of flow-limiting grooves 4 are parallel to each other. It can hold multiple piezometric tubes to be limited at the same time, and limit the flow of multiple piezometric tubes at the same time. At the same time, it also has a collection constraint effect on multiple piezometric tubes to prevent confusion caused by too many pipelines.

It also lies in that the cross-sectional size of the flow-limiting groove 4 close to the rotating member 3 is larger than the cross-sectional size of the flow-limiting groove 4 away from the rotating member 3 . It is used to uniformly limit the clamping of multiple pressure measuring tubes to be limited, and to control the consistency of multiple pressure measuring tubes to be limited, so that multiple pressure measuring tubes clamped by the same current limiting clamp form the same temporary limit. streamer. Prevent the pressure measuring tube close to the transmission member 3 from being too clamped so that the pressure transmission channel of the pressure measuring tube is completely closed.

As shown in FIG. 1 , it also lies in that the plate edge of the upper clamping plate 1 is connected with the plate edge of the lower clamping plate 2 through the rotating member 3 . The clamping of the plate surface on one side of the transmission member 3 can be uniformly controlled, and the limited clamping effect on the pressure measuring tube to be limited is convenient to control.

It also lies in that the plate edge of the upper clamping plate 1 is connected with the middle part of the lower clamping plate 2 through the rotating member 3 . The upper splint 1 can be rotated by 180 ^° on the lower splint 2, so that both sides of the upper splint 1 can be clamped relative to the lower splint 2.

It also lies in that the upper splint 1 and the lower splint 2 are spaced apart, and the middle part of the upper splint 1 and the middle part of the lower splint 2 are connected by a rotating member 3 . Through the rotating connection in the middle, both sides of the rotating member 3 can be clamped and fixed at the same time.

As shown in Figure 3, the current limiting clamp for the pressure measuring tube includes an upper splint 1 and a lower splint 2, the upper splint 1 and the lower splint 2 are arranged in parallel and at intervals, and at least one is provided on the upper splint 1 and/or the lower splint 2 for Clamp and fix the flow-limiting groove 4 through which the pressure measuring tube to be limited is fixed, and the upper splint 1 and/or the lower splint 2 are also provided with a spacing adjustment assembly 5 for adjusting the clamping distance between the upper splint 1 and the lower splint 2 . The upper splint 1 and the lower splint 2 are clamped and fixed by the flow-limiting groove 4 opened on the upper splint 1 and/or the lower splint 2. The current-limiting pressure-measuring tube is arranged along the flow-limiting groove 4 Orientation settings. Since the flow limiting groove 4 is a concave structure penetrating through the wall surface, when the pressure measuring tube to be limited is clamped, the pressure transmission channel of the pressure measuring tube will not be completely closed, and it only plays the role of compressing the transmission channel, forming a temporary limitation. streamer. The current limiting clamp will not damage the shape and structure of the piezometric tube, can be used repeatedly, and the clamping position can be adjusted arbitrarily to form a current limiter on different parts of the piezometric tube, and the setting of the temporary current limiter is simple and convenient. The clamping distance between the upper clamping plate 1 and the lower clamping plate 2 can be adjusted arbitrarily through the spacing adjustment assembly 5 to adjust the radial dimension of the transmission channel of the pressure measuring tube.

It is also that the spacing adjustment assembly 5 includes a first screw hole opened on the upper clamping plate 1, a second screw hole opened on the lower clamping plate 2, and is connected to the first screw hole and the second screw hole for adjusting the upper clamping plate. 1 and the screw at the clamping distance between the lower splint 2, the first screw hole, the second screw hole and the screw are set in a matching manner. The two ends of the screw are respectively matched and connected to the first screw hole and the second screw hole. The screw moves the upper splint 1 by adjusting the relative position of the first screw hole, and the lower splint 2 is adjusted by the screw by adjusting the relative position of the second screw hole. Therefore, the distance between the upper splint 1 and the lower splint 2 at the screw position is adjusted to realize the adjustment of the radial dimension of the pressure transmission channel in the pressure measuring tube to be limited.

As shown in Figure 3, it also lies in that the spacing adjustment assembly 5 includes a first sawtooth 504 arranged on the edge of the upper splint 1 and a hanging edge 6 with a second sawtooth 505 on the edge of the lower splint, the first sawtooth 504 Matching with the second sawtooth 505, the relative position of the plate edge of the upper splint 1 and the hanging edge 6 is adjusted and fixed by the matching first sawtooth 504 and second sawtooth 505 to adjust the clamping distance between the upper splint 1 and the lower splint 2 . The upper splint 1 adjusts the relative position of the upper splint 1 on the hanging edge 6 through the clamping of the first sawtooth 504 and the second sawtooth 505 on the edge of the plate, thereby adjusting the upper splint 1 and the lower splint 2 at the hanging edge 6 The distance between them can realize the adjustment of the radial size of the pressure transmission channel in the pressure measuring tube to be restricted.

The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural transformations made by using the description of the present invention and the contents of the accompanying drawings, or directly or indirectly used in other related technical fields, are all The same reasoning is included in the patent protection scope of the present invention.

Claims (10)

1. A flow-limiting clip for a piezometric tube, characterized in that it comprises an upper splint, a lower splint, and a clamp that is arranged between the upper splint and the lower splint for relative rotation of the upper splint and the lower splint to clamp the pressure measuring tube to be limited. For the rotating part, the upper splint and/or the lower splint is provided with at least one flow-limiting groove for clamping and fixing the flow-limiting pressure measuring tube to be limited. Spacing adjustment assembly for the clamping distance between the clamping plates. 2. The current-limiting clamp for piezo tube according to claim 1, wherein the spacing adjustment assembly includes a first screw hole opened on the upper clamping plate, a second screw hole opened on the lower clamping plate and connected to the first screw hole. The screws on the screw hole and the second screw hole are used to adjust the clamping distance between the upper splint and the lower splint, and the first screw hole, the second screw hole and the screw are arranged in a matching manner. 3. The current limiting clamp for piezo tube according to claim 1, characterized in that the spacing adjustment assembly includes a first sawtooth on the edge of the upper plywood and a hanging edge with second serrations on the edge of the lower plywood The first sawtooth is matched with the second sawtooth, and the relative position of the upper splint and the hanging edge is adjusted and fixed by the matched first and second sawtooth to adjust the clamping distance between the upper splint and the lower splint. 4 . The current limiting clamp for piezo tube according to claim 1 , wherein the current limiting groove is parallel to the rotation axis of the rotating member. 5 . The current-limiting clamp for piezometric tubes according to claim 4 , wherein both the upper splint and the lower splint are provided with flow-limiting grooves, and the flow-limiting grooves on the upper splint and the flow-limiting grooves on the lower splint are arranged correspondingly. 6 . The current-limiting clamp for piezo tube according to claim 4 , wherein the upper splint and/or the lower splint are provided with a plurality of flow-limiting grooves, and the plurality of flow-limiting grooves are parallel to each other. 7 . The current limiting clip for piezo tube according to claim 6 , wherein the cross-sectional size of the flow limiting groove close to the rotating part is larger than that of the limiting groove far away from the rotating part. 8 . 8 . The current limiting clamp for piezometric tube according to any one of claims 1 to 7 , characterized in that, the edge of the upper splint is connected to the edge of the lower splint through a rotating member. 9. The current-limiting clamp for piezo tube according to any one of claims 1 to 7, characterized in that, the edge of the upper splint is connected to the middle of the lower splint through a rotating member; or the upper splint and the lower splint are arranged at intervals, and the upper splint The middle part of the splint is connected with the middle part of the lower splint through a rotating piece. 10. A flow-limiting clip for piezometric tubes, characterized in that it includes an upper splint and a lower splint, the upper splint and the lower splint are arranged in parallel and at intervals, and at least one is provided on the upper splint and/or the lower splint for clamping and fixing. In the flow-limiting groove through which the current-limiting pressure measuring tube passes, the upper splint and/or the lower splint are also provided with a spacing adjustment assembly for adjusting the clamping distance between the upper splint and the lower splint; or the spacing adjustment assembly includes openings on the upper splint. The first screw hole, the second screw hole opened on the lower clamping plate and the screw connected to the first screw hole and the second screw hole to adjust the clamping distance between the upper clamping plate and the lower clamping plate, the first screw hole, The second screw hole and the screw are matched; or the spacing adjustment assembly includes the first sawtooth on the edge of the upper plywood and the hanging edge with the second sawtooth on the edge of the lower plywood, and the first sawtooth and the second sawtooth are matched. , the relative position of the upper splint plate edge and the hanging edge is adjusted and fixed by the matching first sawtooth and second sawtooth to adjust the clamping distance between the upper splint and the lower splint.

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