Device capable of measuring underpressure and overpressure of elastic sealing gasket at flange joint

Abstract

The utility model provides a device capable of measuring underpressure and overpressure of an elastic sealing gasket at a flange joint, a pressure stress test hole is arranged on the outer surface of the edge of the elastic sealing gasket, and a pressure stress test plate matched with the inner wall of the pressure stress test hole is arranged in the pressure stress test hole. The pressure stress test plate in the pressure stress test hole is parallel to the pressed surface of the elastic sealing gasket; the end part, extending out of the pressure stress testing hole, of the pressure stress testing plate is provided with a wiring part, and the wiring part is connected with an under-voltage testing rope and an over-voltage testing rope. When a drawing test is carried out, the under-pressure test rope and the over-pressure test rope respectively correspond to the condition that the under-pressure test rope and the over-pressure test rope are broken or intact, so that whether the actual pressure stress borne by the elastic sealing gasket meets the requirement relative to a specified value or not can be timely, simply, conveniently and effectively judged, and the under-pressure and over-pressure conditions are avoided; therefore, the safe sealing performance and effectiveness of the elastic sealing gasket are guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to pipeline engineering technical field, concretely relates to a device that can determine flange connecting place elastic sealing pad underpressure and overpressure. BACKGROUND

[0002] In pipeline engineering, flange connection is one of the most common connection forms to prevent leakage at the pipeline connection. Elastic sealing pad realizes sealing by two parallel flange extrusion surfaces jointly and uniformly extruding the elastic sealing pad, so that the sealing pad is uniformly stressed and reaches the stress value recommended by the elastic sealing pad manufacturer to play a sealing role.

[0003] However, the following problems still exist in the current actual construction: first, the traditional flange elastic sealing pad cannot directly determine whether the elastic sealing pad is in an underpressure state and has a leakage risk, and cannot timely and effectively determine whether the elastic sealing pad at a specific position truly reaches the pressure stress value required for effective sealing recommended by the elastic sealing pad manufacturer during the installation of the sealing pad, resulting in quality problems in pipeline installation; second, it is impossible to effectively determine whether each part of the elastic sealing pad exceeds the upper limit of the normal use pressure of the sealing pad recommended by the elastic sealing pad manufacturer, and whether there is a risk of affecting the normal service life of the elastic sealing pad and causing the pipeline to leak due to premature failure of the sealing pad during use; third, there is no quick, intuitive and effective method to detect the installation quality of the elastic sealing pad to verify the final installation quality, which consumes a large amount of water for pressure testing and has adverse effects on environmental protection, construction cost and progress control, and safety of deep trench workers. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims to provide a detection device that can intuitively and effectively determine whether the actual pressure stress value of the elastic sealing pad at a certain area deviates from the numerical range and causes underpressure and overpressure problems.

[0005] To this end, the utility model adopts the following technical solutions:

[0006] A device for measuring the underpressure and overpressure of a flange joint elastic sealing gasket, a compression stress test hole is formed on the outer surface of the edge of the elastic sealing gasket, a compression stress test plate is arranged in the compression stress test hole and matched with the inner wall of the compression stress test hole, and the compression stress test plate in the compression stress test hole is arranged in parallel with the compression surface of the elastic sealing gasket; the end of the compression stress test plate extending out of the compression stress test hole is provided with a wiring part, and an underpressure test rope and an overpressure test rope are connected and arranged on the wiring part; the underpressure test rope and the overpressure test rope are in a broken state or an integral state when the compression stress test plate is pulled out for testing, the underpressure test rope in the broken state corresponds to the actual compression stress of the elastic sealing gasket being greater than the lower limit value of the required compression stress, and the overpressure test rope in the broken state corresponds to the actual compression stress of the elastic sealing gasket being greater than the upper limit value of the required compression stress, so that the actual compression stress condition of the elastic sealing gasket in the area can be intuitively embodied.

[0007] Further, the roughness of the compression surfaces on both sides of the compression stress test plate is consistent.

[0008] Further, a hole is formed in the wiring part, so that the underpressure test rope and the overpressure test rope are wound and arranged on the wiring part.

[0009] Further, the end of the underpressure test rope and the overpressure test rope away from the wiring part is connected with a pull ring.

[0010] Further, the pulling priority of the underpressure test rope is higher than that of the overpressure test rope.

[0011] Further, the length of the underpressure test rope is different from that of the overpressure test rope, so as to distinguish the underpressure test rope and the overpressure test rope.

[0012] Further, the compression stress test hole has a spacing between the compression surfaces on both sides of the elastic sealing gasket.

[0013] Further, a plurality of compression stress test holes are arranged on the outer surface of the edge of the elastic sealing gasket, so as to determine the actual compression stress value of the elastic sealing gasket in each specific area.

[0014] Compared with the prior art, the device has the following beneficial effects:

[0015] The utility model discloses a kind of devices for determining underpressure and overpressure of elastic sealing pad in flange connection, and the utility model discloses the outer surface of the edge of elastic sealing pad 5 is provided with pressure stress test hole 6, and the pressure stress test hole 6 is equipped with the pressure stress test plate 1 matched with its inner wall, and the pressure stress test plate 1 in the pressure stress test hole 6 is parallelly arranged with the pressure surface of elastic sealing pad 5;The end of the pressure stress test plate 1 that extends the pressure stress test hole 6 is provided with wiring part, and underpressure test rope 2 and overpressure test rope 3 are connected and arranged on wiring part, and underpressure test rope 2 and overpressure test rope 3 are in fracture state or complete state when pulling the pressure stress test plate 1 test, and underpressure test rope 2 in fracture state corresponds the actual pressure stress of elastic sealing pad 5 when sealing is greater than the lower limit value of required pressure stress, and overpressure test rope 3 in fracture state corresponds the actual pressure stress of elastic sealing pad 5 when sealing is greater than the upper limit value of required pressure stress, so that elastic sealing pad 5 can intuitively reflect its actual pressure stress condition in the region. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the front view structural schematic diagram of the utility model;

[0017] Figure 2 It is the cross section structural schematic diagram of the utility model;

[0018] Figure 3 It is the front view structural schematic diagram of the actual installation of the utility model and use;

[0019] Figure 4 It is the cross section structural schematic diagram of the actual installation of the utility model and use.

[0020] The mark in the drawing is:1-pressure stress test plate;2-underpressure test rope;3-overpressure test rope;4-pull ring;5-elastic sealing pad;6-pressure stress test hole. DETAILED DESCRIPTION

[0021] The utility model will be further described below in connection with the drawings and examples, but not as the basis for limiting the utility model.

[0022] As Figures 1-4 The utility model discloses a kind of devices for determining underpressure and overpressure of elastic sealing pad in flange connection, and the utility model discloses the outer surface of the edge of elastic sealing pad 5 is provided with pressure stress test hole 6, and the pressure stress test hole 6 is equipped with the pressure stress test plate 1 matched with its inner wall, and the pressure stress test plate 1 in the pressure stress test hole 6 is parallelly arranged with the pressure surface of elastic sealing pad 5;The end of the pressure stress test plate 1 that extends the pressure stress test hole 6 is provided with wiring part, and underpressure test rope 2 and overpressure test rope 3 are connected and arranged on wiring part, and underpressure test rope 2 and overpressure test rope 3 are in fracture state or complete state when pulling the pressure stress test plate 1 test, and underpressure test rope 2 in fracture state corresponds the actual pressure stress of elastic sealing pad 5 when sealing is greater than the lower limit value of required pressure stress, and overpressure test rope 3 in fracture state corresponds the actual pressure stress of elastic sealing pad 5 when sealing is greater than the upper limit value of required pressure stress, so that elastic sealing pad 5 can intuitively reflect its actual pressure stress condition in the region.

[0023] The compression stress test holes 6 are arranged on the outer surface of the edge of the elastic sealing pad 5, so as to determine the actual compression stress value of the elastic sealing pad 5 in each specific single area.

[0024] Specifically, the roughness of the compression stress test plate 1 on both sides of the compression surface is consistent, and the grinding is started from a relatively rough grinding paste and ends with the use of F3000 (6 μm) or W7 (5-7 μm) grinding paste, that is, the upper and lower surfaces reach the same precision level of brightness.

[0025] In the embodiment, the thickness of the compression stress test plate 1 is 0.2 mm, and the planar size is 125 mm long, 4 mm wide, 100 mm long, 5 mm wide, 50 mm long, 10 mm wide, and 25 mm long, 20 mm wide, etc. The single side compression area is 500 mm 2 At the same time, the surface roughness of the compression stress test hole 6 is consistent, and the surface roughness of the compression stress test hole 6 of the elastic sealing pad 5 of different models is preferably consistent. The hole opening cross section shape of the compression stress test hole 6 is rectangular, and the hole opening height is uniform, which is 0.2 mm, and the width and depth are consistent with the cross section size of the compression stress test plate 1 used.

[0026] As shown in Figures 1-2 Specifically, a hole is provided in the wiring part, so that the under-voltage test rope 2 and the over-voltage test rope 3 are wound and connected on the wiring part through the hole.

[0027] Specifically, the end of the under-voltage test rope 2 and the over-voltage test rope 3 away from the wiring part is connected with a pull ring 4.

[0028] In the embodiment, the under-voltage test rope 2 and the pull ring 4 are connected with the compression stress test plate 1; when the compression stress test plate 1 bears a pressure value equal to the lower limit value of the compression stress required for the effective sealing of the elastic sealing pad 5, the sliding friction force borne by the compression stress test plate 1 when pulled out of the compression stress test hole 6 is equal to the tensile force value that can be borne when the under-voltage test rope 2 is broken; the over-voltage test rope 3 and the pull ring 4 are connected with the compression stress test plate 1; when the compression stress test plate 1 bears a pressure value equal to the upper limit value of the compression stress required for the effective sealing of the elastic sealing pad 5, the sliding friction force borne by the compression stress test plate 1 when pulled out of the compression stress test hole 6 is equal to the tensile force value that can be borne when the over-voltage test rope 3 is broken.

[0029] Specifically, the pull priority of the under-voltage test rope 2 is higher than that of the over-voltage test rope 3.

[0030] The length of the under-voltage test rope 2 is greater than that of the over-voltage test rope 3, so as to distinguish the under-voltage test rope 2 and the over-voltage test rope 3 for the user to determine the pull sequence, that is, to pull the longer under-voltage test rope 2 first, and then to pull the over-voltage test rope 3.

[0031] The specific compression stress test hole 6 has a spacing between the two sides of the elastic sealing pad 5 and the compression surface.

[0032] According to the mechanical relationship between the actual pressure value of the elastic sealing pad 5 and the pulling force relationship of the corresponding compression stress test plate 1 pulled out from the compression stress test hole 6 arranged at the edge of the elastic sealing pad 5, the corresponding mechanical principle can be obtained according to the sliding friction force calculation formula as follows:

[0033] f=μ×N

[0034] In the formula: μ is the friction coefficient between the upper and lower surfaces of the compression stress test plate 1 and the contact surface with the same friction coefficient in the compression stress test hole 6. Since the upper and lower surfaces of the compression stress test plate 1 are polished to a uniform precision level surface by F3000 (6μm) or W7 level (5~7μm) polishing paste, the roughness of the upper and lower surfaces is uniform and smooth. Therefore, the friction coefficient between the upper and lower surfaces of the compression stress test plate 1 and the inner surface of the stress compression end of the elastic sealing pad 5 is uniform. For convenience of use, the friction coefficient between the surface of the compression stress test plate 1 and the inner surface of the compression stress test hole 6 can be calibrated by the manufacturer before use through standard test.

[0035] N is the vertical pressure applied to the upper and lower surfaces of the compression stress test plate 1;

[0036] f is the maximum pulling force of the sliding friction between the compression stress test plate 1 and the elastic sealing pad 5.

[0037] Since the actual compression stress of the installed elastic sealing pad 5 is calculated by the formula P 实际 =N / A, wherein N represents the pressure of the compression stress test plate 1 from the elastic sealing pad 5, and A represents the single-sided horizontal surface area of the compression stress test plate 1.

[0038] Since the upper and lower surfaces of the compression stress test plate 1 simultaneously bear the friction force, the pulling force value T measured at the moment when the compression stress test plate 1 is pulled should be twice the friction force received by the single side of the compression stress test plate 1. Therefore, the actual compression stress of the installed elastic sealing pad 5 is calculated by the formula P actual=N / A, which is substituted into the friction force calculation formula to obtain:

[0039] f= =μ×(P 实际 ×A), simplified as

[0040] P 实际 =

[0041] The utility model discloses according to the effective sealing stress value P 推荐下限 and P推荐上限 The under-pressure test rope 2 and the over-pressure test rope 3 are customized: when the effective sealing stress value of the elastic sealing gasket is less than P 推荐下限 , the entire compression stress test plate 1 is pulled out completely, the under-pressure test rope 2 wire does not break, and this method can quickly determine whether the installation compression stress of the flange elastic sealing gasket 5 is under pressure; when the effective sealing stress value of the elastic sealing gasket is greater than P 推荐下限 and less than P 推荐上限 , the entire compression stress test plate 1 cannot be pulled out, and then the over-pressure test rope 3 is pulled and does not break, and the entire compression stress test plate 1 is pulled out completely, and this method can quickly determine whether the installation compression stress of the flange elastic sealing gasket 5 can reach the effective stress value and make the elastic sealing gasket 5 under pressure within the range that does not affect the normal service life; when the effective sealing stress value of the elastic sealing gasket 5 exceeds P 推荐上限 , the over-pressure test rope 3 breaks when pulled, and the compression stress test plate 1 cannot be pulled out, and this method can quickly determine whether the installation compression stress of the elastic sealing gasket 5 exceeds the normal service life range and whether the elastic sealing gasket 5 has the phenomenon of over-pressure compression stress affecting the normal service life of the sealing gasket.

[0042] Based on the above, compared with the traditional flange sealing gasket 5 and installation quality determination, the detection device avoids the problem of being unable to quickly, intuitively and effectively verify the final installation quality and consuming a large amount of water for pressure test flange sealing gasket leakage. Not only does it avoid wasting a large amount of water, related machinery and instrument investment, and the time required to reinforce or remove the flange connection after discovering the leakage, replacing the elastic sealing gasket 5 and performing a pressure test again until the installation quality is qualified, but also avoids the adverse effects of deep trench operation personnel safety caused by the collapse of the deep trench operation surface affected by the rain in the rainy season, saves a large amount of water resources, shortens the construction period, reduces labor and machinery investment, and has a significant improvement effect on environmental protection, construction cost and progress control, and safety management.

[0043] Please refer to Figures 1-4 , when the detection device detects the under-pressure and over-pressure of the flange connection elastic sealing gasket, the specific method is as follows:

[0044] At the part where the actual compression stress value of the elastic sealing gasket 5 needs to be determined, the compression stress test plate 1 is completely inserted into the compression stress test hole 6 at the edge of the elastic sealing gasket 5, and then all the bolts are tightened according to the specified order and tightening torque value;

[0045] Firstly, the pull ring 4 connected with the under-pressure test rope 2 is slowly pulled outwards in the flange radial direction in the plane parallel to the surface of the elastic sealing gasket 5, when the pull ring 4 of the under-pressure test rope 2 can pull out the whole pressure stress test plate 1 without the under-pressure test rope 2 being broken, it indicates that the actual pressure stress of the elastic sealing gasket is lower than the specified value and there is a risk of leakage, and the bolt needs to be tightened;

[0046] When the pull ring 4 of the under-pressure test rope 2 is pulled out completely and the under-pressure test rope 2 is broken, the pull ring 4 connected with the over-pressure test rope 3 is pulled, and when the pressure stress test plate 11 can be pulled out completely but the over-pressure test rope 3 is not broken, it indicates that the actual pressure stress of the elastic sealing gasket 5 has reached the specified pressure stress value of the sealing gasket and there is no case of the service life of the sealing gasket being affected by over-pressure;

[0047] When the pull ring 4 of the over-pressure test rope 3 is pulled and the pressure stress test plate 1 cannot be pulled out completely and the over-pressure test rope 3 is broken, it indicates that the actual pressure stress of the elastic sealing gasket 5 has exceeded the upper limit value of the pressure stress required for the effective sealing of the elastic sealing gasket 5, and there is over-pressure of the sealing gasket.

[0048] The above embodiment is only a relatively optimal technical solution of the present application, and those skilled in the art should understand that the technical solution or parameter in the embodiment can be modified or replaced without departing from the principles and essence of the present application, and all should be covered within the protection scope of the present application.

Claims

1. A device for measuring underpressure and overpressure of an elastic sealing gasket at a flange connection, characterized in that: A compression stress test hole (6) is opened on the edge outer surface of the elastic sealing gasket (5), a compression stress test plate (1) is arranged in the compression stress test hole (6) and matched with the inner wall of the compression stress test hole (6), and the compression stress test plate (1) in the compression stress test hole (6) is arranged in parallel with the compression surface of the elastic sealing gasket (5); The end of the compression stress test plate (1) extending out of the compression stress test hole (6) is provided with a wiring part, and the wiring part is connected with an under-voltage test rope (2) and an over-voltage test rope (3), the under-voltage test rope (2) and the over-voltage test rope (3) are in a broken state or an intact state when the compression stress test plate (1) is pulled, the under-voltage test rope (2) in the broken state corresponds to the actual compression stress of the elastic sealing gasket (5) being greater than the lower limit value of the required compression stress, and the over-voltage test rope (3) in the broken state corresponds to the actual compression stress of the elastic sealing gasket (5) being greater than the upper limit value of the required compression stress, so that the actual compression stress condition of the elastic sealing gasket (5) in the area of the compression stress test hole (6) can be directly reflected.

2. The device for measuring the under-pressure and over-pressure of the elastic sealing gasket of the flange joint according to claim 1, characterized in that: The compression surfaces on both sides of the compression stress test plate (1) have the same roughness.

3. The device for measuring the under pressure and over pressure of the elastic sealing gasket of the flange joint according to claim 1, characterized in that: Holes are opened in the wiring part, so that the under-voltage test rope (2) and the over-voltage test rope (3) are wound and connected on the wiring part.

4. The device for measuring the under pressure and over pressure of the elastic sealing gasket of the flange joint according to claim 1, characterized in that: The end of the under-voltage test rope (2) and the over-voltage test rope (3) away from the wiring part is connected with a pull ring (4).

5. The device for measuring the under pressure and over pressure of the elastic sealing gasket of the flange joint according to claim 1, characterized in that: The pulling priority of the under-voltage test rope (2) is higher than that of the over-voltage test rope (3).

6. The device for measuring the under-pressure and over-pressure of the elastic sealing gasket of the flange joint according to claim 1, characterized in that: The length of the under-voltage test rope (2) is different from that of the over-voltage test rope (3), so as to distinguish the under-voltage test rope (2) and the over-voltage test rope (3).

7. The device for measuring the under-pressure and over-pressure of the elastic sealing gasket of the flange joint according to claim 1, characterized in that: The compression stress test hole (6) has a spacing between the compression surfaces on both sides of the elastic sealing gasket (5).

8. The device for measuring the under-pressure and over-pressure of the elastic sealing gasket of the flange joint according to claim 1, characterized in that: A plurality of compression stress test holes (6) are arranged on the edge outer surface of the elastic sealing gasket (5), so as to determine the actual compression stress value of the elastic sealing gasket (5) in each specific area.

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