Oil bag structure of bag type oil bag stressometer

Abstract

The utility model discloses an oil bag structure of a bag type oil bag stressometer, which relates to the technical field of geological exploration and comprises an oil bag C. The oil bag C is of a closed tubular structure, the cross section of the oil bag C comprises at most two sections of arc-shaped outer contours and a bent inner contour. The technical problem that in the prior art, after an oil bag is expanded, the hole wall of a drilled hole is prone to being damaged is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of geological exploration, in particular to an oil bag structure of a bag-type oil bag stress gauge. Background Art

[0002] In the fields of engineering mechanics and geological exploration, oil bladder strain gauges are a commonly used pressure measurement tool and are widely used in pressure monitoring of various underground structures. The oil bladder structure of the oil bladder strain gauge is the core component for achieving pressure measurement.

[0003] In the prior art, the traditional oil bladder adopts a clip-type structure, that is, the bladder body of the oil bladder is clamped between two upper and lower cast iron clips. When the bladder body expands, the cast iron clip contacts the wall of the drilled hole, thereby transmitting pressure. However, this design has obvious defects. First, during or after the expansion of the oil bladder, the upper and lower cast iron clips are prone to slip and misalignment, resulting in detection failure. Secondly, the cast iron clip is in rigid contact with the wall of the drilled hole, and the shape is not completely matched. After the oil bladder structure expands, it is easy to cause damage to the hole wall. In addition, the installation process requirements of this oil bladder structure are relatively high. If there is a deviation in the installation angle, it will also affect the detection effect. In this regard, the prior art also has an oil bladder with a star-shaped structure, which is star-shaped before pressurization and expands into a flower shape after pressurization.

[0004] Although this design is a certain improvement over the clip-type structure, it still has at least the following problems: since the oil bladder is not completely round after expansion, its edges and corners may still damage the hole wall. Utility Model Content

[0005] The embodiment of the present application solves the technical problem in the prior art that the oil bladder is prone to damage the wall of the drilled hole after expansion by providing an oil bladder structure of a bag-type oil bladder stress gauge.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solutions: an oil bag structure of a bag-type oil bag stress gauge, including an oil bag C, the oil bag C is a closed tubular structure, the cross section of the oil bag C includes an arc-shaped outer contour and a bent inner contour, wherein the arc-shaped outer contour is provided with at most two sections. The oil bag C of the utility model is designed as a closed tubular structure, and the cross section includes an arc-shaped outer contour and a bent inner contour, wherein the arc-shaped outer contour is provided with at most two sections, such a design makes the contour of the oil bag C closer to a circle after expansion, and can better fit with the borehole wall to form a flexible contact, so the oil bag C will not damage the borehole wall after expansion, and at the same time effectively avoids the problem of easy slippage and dislocation of the traditional oil bag, and improves the stability and accuracy of the measurement.

[0007] As a further improvement of the above solution, the cross section of the oil bag C is a fan-shaped structure larger than 180°.

[0008] As a further improvement of the above scheme, the angle of the fan-shaped structure at the cross section of the oil bag C is θ, and the calculation formula of θ is θ=360°(πr 2 -r 1 ) / (πr 1 ), where r 1 is the radius of the oil bladder C before expansion, r 2 is the radius of the oil bladder C after expansion; thus, by reasonably calculating the sector angle θ, it is possible to ensure that the circumference of the oil bladder C before and after expansion is consistent, further improving the fit between the oil bladder C and the hole wall, making the pressure measurement more accurate.

[0009] As a further improvement of the above solution, the arc-shaped outer contour is a segment, the bent inner contour is a V-shaped groove, and the depth of the groove is not less than the radius of the circle corresponding to the arc-shaped outer contour.

[0010] As a further improvement of the above solution, the arc-shaped outer contour is divided into two sections, and correspondingly, the bent inner contour is also provided with two sections, and the two sections of the bent inner contour both form a V-shaped groove.

[0011] As a further improvement of the above solution, the wall thickness of the oil bladder C is the same on any cross section of the oil bladder C; thereby, uniform expansion during pressurization is ensured and measurement accuracy is further improved.

[0012] It can be seen from the above technical solutions that the utility model has at least the following technical effects or advantages:

[0013] The oil bladder C of the utility model is designed as a closed tubular structure, and the cross section includes an arc-shaped outer contour and a bent inner contour. The arc-shaped outer contour is provided with two sections at most. Such a design makes the contour of the oil bladder C closer to a circle after expansion, and can better fit with the borehole wall to form a flexible contact. Therefore, the oil bladder C will not damage the borehole wall after expansion, and effectively avoids the problem of easy slippage and dislocation of traditional oil bladders, thereby improving the stability and accuracy of measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solution of the utility model, the following is a brief introduction to the drawings required for the description. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work:

[0015] Figure 1 The structure of the oil bag in the prior art is shown in FIG. Figure 1 ;

[0016] Figure 2 The structure of the oil bag in the prior art is shown in FIG. Figure 2 ;

[0017] Figure 3 Schematic diagram of the oil bag structure of the bag-type oil bag strain gauge in Example 1;

[0018] Figure 4 Schematic diagram of the oil bag structure of the bag-type oil bag strain gauge in Example 2;

[0019] Figure 5 Schematic diagram of the oil bag structure of the bag-type oil bag strain gauge in Example 3.

[0020] Explanation of the accompanying drawings: 1. Oil bladder A, 2. Cast iron clip, 3. Bladder body, 4. Oil bladder B, 5. Oil bladder C. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments in this patent, other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this patent.

[0022] In order to better understand the improvements made by the present invention relative to the prior art, before describing in detail the three specific implementation modes of the present invention, the prior art mentioned in the background technology section is first described in conjunction with the drawings.

[0023] Figure 1 and Figure 2 The schematic diagrams of the oil bag structure of the oil bag stress gauge in the prior art are shown respectively. Figure 1 , Figure 2 The figures show the contrast effect before and after the oil bladder is expanded, wherein the left side shows the effect before the oil bladder is expanded, and the right side shows the effect after the oil bladder is expanded by pressurization.

[0024] Figure 1 The oil bladder structure of a clip-type oil bladder stress gauge is shown. The oil bladder A1 adopts a clip-type structure, with a cast iron clip 2 on the upper and lower sides, and a bladder body 3 between the two cast iron clips 2. When the bladder body 3 between the two cast iron clips 2 expands, the two cast iron clips 2 will contact the wall of the drilled hole, thereby transmitting pressure. For this structure, during the expansion of the oil bladder A1 or after the expansion of the oil bladder A1, the upper and lower cast iron clips 2 are easy to slip and misalign, resulting in detection failure. Moreover, from Figure 1It can be seen that the cast iron clip 2 is in rigid contact with the hole wall of the drilled hole, and their shapes do not completely match. Therefore, when the oil bladder A1 expands, the upper and lower cast iron clips 2 are likely to damage the hole wall. In addition, during the installation of the oil bladder A1, if there is an angle deviation, it will affect the detection effect, so the requirements for the installation process are extremely high. On the other hand, with this oil bladder structure, when the oil bladder A1 expands, the contact area between the oil bladder A1 and the cast iron clip 2 is small, and the contact area cannot be determined. Therefore, the size of the hole wall pressure cannot be effectively calculated by the oil pressure of the oil bladder A1.

[0025] Figure 2 The oil bag structure shown is also one of the prior art. Figure 2 As shown, the oil bladder B4 of this structure is a star-shaped structure before pressurization. When the oil bladder B4 expands, its cross section is a flower-shaped structure. Figure 1 The oil bladder A1 has certain improvements, but there are still many technical problems in manufacturing or using. For example, the oil bladder B4 has many angular structures, which makes it difficult to process and manufacture; the air outlets at both ends of the oil bladder B4 are difficult to handle, which makes the welding process more complicated; the oil bladder B4 is not completely round after expansion, and its edges and corners will still damage the hole wall.

[0026] The three embodiments of the utility model are improvements made to address the above-mentioned prior art that the oil bag is easy to damage the suspended hole wall. Figures 3 to 5 Only the cross-sectional view of the present utility model is shown. The following is a detailed description of the three specific implementations.

[0027] Embodiment 1

[0028] This embodiment discloses an oil bag structure of a bag-type oil bag stress gauge, including an oil bag C5, wherein the oil bag C5 is a closed tubular structure, and its cross section includes an arc-shaped outer contour and a bent inner contour. The arc-shaped outer contour is provided with a section, and such a design enables the oil bag C5 to better fit the borehole wall after expansion.

[0029] Specifically, the cross section of the oil bag C5 is a fan-shaped structure greater than 180°. The design of the fan-shaped structure enables the oil bag C5 to form a flexible contact with the borehole wall after expansion to ensure complete fit, thereby effectively reflecting the pressure changes of the borehole wall and avoiding damage to the borehole wall.

[0030] like Figure 1 As shown in the figure, the angle of the fan-shaped structure is θ, θ = 360° (πr 2 -r 1 ) / (πr 1 ), where r 1 is the radius of the oil bag C5 before expansion, r2 is the radius of the expanded oil bladder C5. This calculation formula is based on the principle of ensuring that the expanded oil bladder C5 is completely fitted with the hole wall, and the circumference of the oil bladder C5 before and after expansion is made consistent through calculation.

[0031] For example, taking the commonly used oil bag C5 installation hole diameter of 44mm as an example, take 0.95 times the hole diameter as the diameter of the oil bag C5 before expansion, that is, 41.8mm (radius is 20.9mm); take 1.05 times the hole diameter as the diameter of the oil bag C5 after expansion, that is, 46.2mm (radius is 23.1mm). Substituting into the above calculation formula of the sector angle, we can get θ=283.3°.

[0032] In addition, the thickness of the oil bladder C5 is the same at all locations on the cross section (ie, the wall thickness of the oil bladder C is the same on any cross section of the oil bladder C). This design ensures uniform expansion of the oil bladder C5 during pressurization and further improves the fit with the hole wall.

[0033] Embodiment 2

[0034] The basic structure of this embodiment is the same as that of the first embodiment, except that the cross-sectional design of the oil bladder C5 is different. Figure 4 As shown, the arc-shaped outer contour is a segment, the bent inner contour is a V-shaped groove, and the depth of the groove is not less than the radius of the circle corresponding to the arc-shaped outer contour.

[0035] Embodiment 3

[0036] The basic structure of this embodiment is the same as that of the first and second embodiments, except for the number of segments of the arc-shaped outer contour and the bent inner contour. Figure 5 As shown, the arc outer contour is divided into two sections, and correspondingly, the bent inner contour is also provided with two sections, and both sections of the bent inner contour form a V-shaped groove. Such a design can ensure that when the oil bag C5 is pressurized, the bent parts on both sides can be expanded synchronously, which is conducive to improving the fit and monitoring accuracy.

[0037] In the description of the present invention, the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "vertical", "horizontal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the purpose of describing the present invention rather than requiring the present invention to be constructed or operated in a specific position, and therefore cannot be understood as a limitation on the present invention. The terms "connected" and "connected" in the present invention should be understood in a broad sense, for example, it can be a connection or a detachable connection; it can be a direct connection or an indirect connection through an intermediate component. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0038] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in their embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novelties disclosed herein.

Claims

1. An oil bag structure of a bag-type oil bag strain gauge, comprising an oil bag C (5), characterized in that: The oil sac C (5) is a closed tubular structure. The cross section of the oil sac C (5) includes an arc-shaped outer contour and a bent inner contour, wherein the arc-shaped outer contour has at most two sections.

2. The oil bag structure of the bag type oil bag strain gauge according to claim 1 is characterized in that: The cross section of the oil bag C (5) is a fan-shaped structure with an angle greater than 180°.

3. The oil bag structure of the bag type oil bag strain gauge according to claim 2, characterized in that: The angle of the fan-shaped structure at the cross section of the oil bladder C (5) is θ, and the calculation formula of θ is: θ=360°(πr2-r1) / (πr1), where r1 is the radius of the oil bladder C (5) before expansion, and r2 is the radius of the oil bladder C (5) after expansion.

4. The oil bag structure of the bag type oil bag strain gauge according to claim 1, characterized in that: The arc-shaped outer contour is a segment, the bent inner contour is a V-shaped groove, and the depth of the groove is not less than the radius of the circle corresponding to the arc-shaped outer contour.

5. The oil bag structure of the bag-type oil bag strain gauge according to claim 1, characterized in that: The arc-shaped outer contour is divided into two sections, and correspondingly, the bent inner contour is also provided with two sections, and the two sections of the bent inner contour both form a V-shaped groove.

6. The oil bag structure of a bag-type oil bag strain gauge according to any one of claims 1 to 5, characterized in that: In any cross section of the oil sac C (5), the wall thickness of the oil sac C (5) is the same.

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