CN103900768A - Multifunctional seal ring leakage detecting device - Google Patents

Abstract

The invention discloses a leak detection device for a multi-functional seal ring, which comprises a flange cover and a flange plate which are mutually sealed and matched, and a cylindrical mold is arranged between the matching end surface of the flange plate and the flange cover. A cavity, the cavity is provided with a mandrel matching the cavity, and at least one first sealing groove for placing the sealing ring to be tested is provided on the axial mating surface of the mandrel and the cavity ; The flange cover is formed with a first air intake channel or a first air leakage detection channel communicated with the cavity, and the flange is formed with a first air leakage detection channel communicated with the cavity channel or first intake channel. The seal ring leak detection device of the present invention still has relatively accurate detection results at high temperatures, can be applied to the detection of seal rings of different specifications, has high detection efficiency, and can also detect the combined sealing performance of seal rings of different types and specifications .

Description

A multi-functional sealing ring leak detection device

technical field

The invention relates to the technical field of seal ring detection, in particular to a multifunctional seal ring leak detection device.

Background technique

At present, in the valve industry, the testing of the sealing performance of O-rings, pan-seal rings and other sealing rings is mostly carried out directly by using the valve, but there are many defects in the direct use of the valve, such as high cost, many leakage points, and insufficient test data. Accurate, difficult to control the assembly process and other shortcomings, so a testing equipment that can professionally test the sealing performance of the sealing ring is needed.

For example, Chinese patent document CN102435402A discloses a sealing ring leakage rate detection device, which includes a flange that is tightly connected to a flange plate and a flange cover, and an inner sealing groove and an outer sealing groove arranged between the flange plate and the flange cover. The sealing ring to be tested is placed in the sealing groove of the inner channel, and the standard sealing ring is placed in the sealing groove of the outer channel. The contact between the flange plate and the flange cover is provided with an annular leak detection groove and a gas chamber; the annular leak detection groove is set in the outer channel Between the sealing groove and the inner sealing groove, it is in non-leakage communication with the external leak detection pipe; the gas chamber is set at the center of the flange and is in non-leakage communication with the cylinder outside the flange. The sealing ring to be detected of the detection device is set at the end face of the flange and the flange cover, that is, in the inner sealing groove. When the sealing performance of the sealing ring is tested at high temperature, it is used to connect the flange and the flange. The bolts of the flange cover will expand when heated and elongate along its axial direction, which will cause the gap between the flange plate and the flange cover to increase, and the pre-pressure of the sealing ring to be tested will become smaller, which in turn will cause the seal to be tested The sealing performance of the ring is reduced, and the error of the leak rate detection result is too large, which cannot truly reflect the sealing performance of the sealing ring at high temperature, and the detection device can only detect one sealing ring at a time, the detection efficiency is low, and the function is single.

Contents of the invention

For this reason, the technical problem that the present invention primarily solves is that the sealing performance of the sealing ring to be detected decreases due to thermal expansion of the existing sealing ring leak detection device at high temperature, thereby increasing the detection error; the second problem to be solved by the present invention The technical problem is that the detection efficiency of the existing detection device is low and the function is single.

To achieve the above object, the present invention adopts the following technical solutions:

A multifunctional sealing ring leak detection device, which includes a flange cover and a flange plate that are sealed and matched with each other, a cylindrical cavity is provided between the flange plate and the matching end surface of the flange cover, and the A mandrel matching the cavity is provided in the cavity, and at least one first sealing groove for placing the sealing ring to be tested is provided on the axial mating surface of the mandrel and the cavity; the method A first air inlet passage or a first air leakage detection passage communicating with the cavity is formed on the flange cover, and a first air leakage detection passage or a first air leakage detection passage communicating with the cavity is formed on the flange correspondingly. intake channel.

At least one mandrel protrusion or mandrel groove is formed on one side of the radial surface of the mandrel, and the flange cover or the At least one flange groove or flange protrusion is correspondingly formed on the radial surface of the flange; the mandrel protrusion and the flange groove, or the mandrel groove and the flange protrusion At least one second sealing groove for placing the sealing ring to be tested is provided on the axial mating surface; the flange cover or the flange plate are respectively formed with a second air intake passage and a second air leakage detection channels, wherein the second air intake channel and the second air leakage detection channel communicate with both sides of the second sealing groove respectively.

The cavity is a groove formed on the flange, the first sealing groove is formed at the joint between the mandrel and the inner wall of the groove, and the mandrel and the flange are The mandrel groove is formed on the radial mating surface, the flange protrusion is formed corresponding to the flange, and the second seal is formed on the mating surface of the mandrel groove and the flange protrusion Groove; the first air intake channel is formed on the flange cover and communicates with the cavity, the second air intake channel is formed on the flange plate and communicates with the mandrel groove and the The radial mating surface protruding from the flange, the first air leakage detection channel and the second air leakage detection channel are formed on the flange and communicate with the diameter of the mandrel and the flange to the mating surface.

The first air leakage detection channel and the second air leakage detection channel share one channel.

The sealing ring to be tested includes an O-ring and a pan-seal ring; the first sealing groove includes an O-ring groove arranged in the middle of the mandrel, and a groove arranged on the mandrel near the method. An annular notch at the edge of one end of the flange cover, the annular notch is used to place the first pan-seal ring to be tested; the second sealing groove includes an O-ring groove arranged at the middle position of the flange protrusion , and an annular notch arranged at the edge of the flange protrusion, the annular notch is used to place the second Varise ring to be tested.

An annular protrusion is provided on the end face of the flange cover that matches the flange, the inner diameter of the annular protrusion is smaller than the diameter of the cavity, and the outer diameter of the annular protrusion is larger than the cavity The diameter of the flange cover and the flange plate are sealed and fit through the sealing gasket sleeved on the annular protrusion.

A first step is provided at the joint between the flange and the annular protrusion, and a dust-proof sealing ring is provided on the first step.

A retaining ring is provided in the annular notch on the mandrel, one end of the retaining ring abuts against the annular protrusion, and the other end abuts against the opening of the first Varise ring to be tested.

A lifting ring for moving or fixing the flange is provided on the side wall of the flange.

Beneficial effects of the present invention:

(1) The sealing ring leak detection device of the present invention forms a cavity by forming the mating surface between the flange plate and the flange cover, a mandrel is arranged in the cavity, and the sealing ring to be detected is set on the joint between the mandrel and the inner wall of the cavity. At the matching place, even if the gap between the flange cover and the flange plate increases due to the thermal expansion of the bolts at high temperature, this setting method will not affect the sealing performance of the sealing ring to be tested. Therefore, the leak detection device of the present invention It still has relatively accurate detection results at high temperatures;

(2) At least one mandrel protrusion or mandrel groove is formed on one side of the radial surface of the mandrel of the present invention, and the flange cover or flange that matches the radial surface on one side of the mandrel At least one flange groove or flange protrusion is correspondingly formed on the radial surface of the disk; and other specifications can be set at the joint between the mandrel protrusion and the flange groove or the mandrel groove and the flange protrusion. Therefore, the leak detection device of the present invention can detect sealing rings of different specifications, has high detection efficiency, and has a wide application range.

(3) The sealing groove in the present invention includes an O-ring groove and an annular gap for placing a pan-seal ring. Therefore, the leak detection device of the present invention can simultaneously detect the combined sealing performance of sealing rings of different types and specifications .

Description of drawings

In order to make the content of the invention easier to understand clearly, the present invention will be described in further detail below according to specific embodiments of the present invention in conjunction with the accompanying drawings, wherein:

Fig. 1 is the structural representation of leak detection device of the present invention;

Fig. 2 is the full sectional view of flange plate of the present invention;

Fig. 3 is the full sectional view of flange cover of the present invention;

Figure 4 is a full sectional view of the mandrel of the present invention;

Fig. 5 is a partial enlarged view of part A in Fig. 1;

Fig. 6 is a partially enlarged view of part B in Fig. 1 .

The reference signs in the figure represent:

1-flange cover; 10-bolt; 11-first air inlet; 12-annular protrusion; 2-flange; 21-cavity; 22-flange protrusion; 23-second air intake channel; 25', 31'-annular gap; 23-the second air intake channel; 24-the first air leakage detection channel; 24'-the second air leakage detection channel; 25, 31-O-ring groove; 33-mandrel Groove; 26-the first step; 27-the second step; 3-mandrel; 4-sealing gasket; 51-the first pan-seal ring to be tested; 52-the second pan-seal ring to be tested; 6-dustproof Sealing ring; 7-ring; 8-retaining ring; 91,92-O-ring.

Detailed ways

Referring to Fig. 1, a multi-functional sealing ring leak detection device, which includes a flange cover 1 and a flange plate 2 that are sealed and matched with each other through bolts 10, and the mating end surface of the flange plate 2 and the flange cover 1 A cylindrical cavity 21 is provided on the top, and a mandrel 3 matching the cavity 21 is arranged in the cavity 21, and two A first sealing groove for placing the sealing ring to be tested, the first sealing groove is arranged along the axial surface of the mandrel 3; The first air intake passage 11 is formed on the flange 2 correspondingly with a first air leakage detection passage 24 communicating with the cavity 21 . The sealing ring leak detection device of the present invention sets the mandrel 3 in the cavity 21 of the flange plate 2, and sets the sealing ring to be tested at the matching place between the mandrel 3 and the inner wall of the cavity 21. Due to the thermal expansion of the bolts at high temperature, the gap between the flange cover 1 and the flange plate 2 increases, and the sealing performance of the sealing ring to be tested will not be affected. Therefore, the leak detection device of the present invention still has relatively accurate performance at high temperatures. In addition, the detection device of the present invention is low in cost, has few external leakage points, and the assembly process is easy to control.

Referring to Fig. 2 and Fig. 4, a mandrel groove 33 is formed on the radial surface of the side of the mandrel 3 close to the flange 2 in this embodiment, which is consistent with the mandrel 3. A flange protrusion 22 is correspondingly formed on the radial surface of the flange plate 2 matched with the radial surface; A second sealing groove for placing the sealing ring to be detected; the flange 2 is formed with a second air intake passage 23 and a second air leakage detection passage 24'. In this embodiment, in order to reduce processing costs and facilitate detection, the first air leakage detection channel 24 and the second air leakage detection channel 24' share one channel; the second air intake channel 23 and the second air leakage detection channel 24' respectively communicate with the first Two sides of the sealing groove. Since the sealing ring to be detected is also arranged at the joint between the mandrel groove 33 and the flange protrusion 22, the detection device of the present invention can not only detect sealing rings of different specifications at the same time, but also detect the combined sealing of sealing rings of different specifications. Performance, so the leak detection device of the present invention has more complete functions and higher detection efficiency.

In this embodiment, the sealing ring to be detected includes an O-ring and a pan-seal ring; the first sealing groove includes an O-ring groove 31 arranged in the middle of the mandrel 3, and the O-ring An O-ring seal 91 is placed in the sealing ring groove 31, and an annular notch 31' is arranged on the edge of the mandrel 3 close to the end of the flange cover 1, and the annular notch 31' is used to place the first to-be-detected Variseal ring 51, referring to Fig. 5, the opening of the first to-be-tested Variseic ring 51 is set towards the side of the end face of the flange cover 1, so as to detect the end face sealing performance of the Varysian ring; the second sealing groove includes The O-ring seal groove 25 arranged in the middle of the flange protrusion 22, the O-ring seal ring 92 is placed in the O-ring seal groove 25, and the edge of the flange protrusion 22 is arranged The annular notch 25', the annular notch 25' is used to place the second varissenic ring 52 to be tested, see Fig. 6, the opening of the second varissenic ring 52 to be tested faces the center of the shaft, so as to detect the varissenic ring 52 The radial sealing performance of the ring. The seal ring leak detection device of the present invention can detect the end face and radial sealing performance of the universal plug ring, and the detection result is more comprehensive.

Referring to FIG. 3 , in this embodiment, an annular protrusion 12 is provided on the end face of the flange cover 1 that cooperates with the flange plate 2 , and the inner diameter of the annular protrusion 12 is smaller than the diameter of the cavity 21 , the outer diameter of the annular protrusion 12 is larger than the diameter of the cavity 21; the flange cover 1 and the flange plate 2 are sealed by the sealing gasket 4 sleeved on the annular protrusion 12 In cooperation, the sealing gasket 4 is arranged at the second step 27 of the flange 2, and the sealing gasket 4 is made of graphite material. This setting method is conducive to improving the sealing performance between the flange cover 1 and the flange cover 2, and improving the detection accuracy. At the same time, the annular protrusion 12 is convenient for checking the universal ring in the annular gap 31' on the mandrel 3. fixed.

In this embodiment, a first step 26 is provided at the joint between the flange 2 and the annular protrusion 12, and a dustproof sealing ring 6 is provided on the first step 26, and the dustproof sealing ring 6 It can effectively prevent graphite powder or other impurities from blocking the detection channel.

In this embodiment, a retaining ring 8 is provided in the annular notch 31' on the mandrel 3, one end of the retaining ring 8 abuts against the annular protrusion 12, and the other end abuts against the first On the opening of the varissen ring 51 to be detected.

In order to facilitate moving or fixing, a suspension ring 7 is provided on the side wall of the flange 2 , and the suspension ring 7 is screwed to the flange 2 .

The working principle of the sealing ring leak detection device of the present invention:

1. The testing steps for the sealing performance of the varisnel ring are as follows:

Step 1--loading the first varissenic ring 51 to be tested and the second varissenic ring 52 to be tested;

Step 2—block the second air inlet 23, take in air from the first air inlet 11, and detect the sealing performance of the first varissen ring 51 to be tested from the first air leakage detection channel 24;

Step 3---block the first air inlet 11, take in air from the second air inlet 23, and detect the sealing performance of the second varissen ring 52 to be tested from the second air leakage detection channel 24'.

2. The testing steps for the sealing performance of the O-ring are:

Step 1--install O-ring 91 and O-ring 92;

Step 2--block the second air inlet 23, intake air from the first air inlet 11, and detect the sealing performance of the O-ring 91 from the first air leakage detection channel 24;

Step 3---block the first air inlet 11, take in air from the second air inlet 23, and detect the sealing performance of the O-ring 92 from the second air leakage detection channel 24'.

The detection of the sealing performance of the O-shaped sealing ring can also be carried out from the first air leakage detection channel 24, and the sealing performance of the O-shaped sealing ring 91 can be detected from the first air inlet 11, and the sealing performance of the O-shaped sealing ring 91 can be detected from the second air inlet 23. To detect the sealing performance of the O sealing ring 92, this detection method can simultaneously detect the sealing performance of the two sealing rings, thereby improving the detection efficiency.

3. The testing steps for the combined sealing performance of the O-ring and the pan-seal ring are as follows:

Step 1 - install the O-ring seal 91, the O-ring 92, the first pan-seal ring 51 to be tested, and the second pan-seal ring to be tested 52;

Step 2 - block the second air inlet 23, take in air from the first air inlet 11, and detect the combination of the O-ring 91 and the first varissen ring 51 to be tested from the first air leakage detection channel 24 sealing performance;

Step 3--block the first air inlet 11, take in air from the second air inlet 23, and detect the connection between the O-ring 92 and the second varissen ring 52 to be detected from the second air leakage detection channel 24' Combined sealing performance.

In the detection of the sealing performance of the above-mentioned different sealing rings, the overall cooling or heating of the device can also detect the sealing performance of the universal plug ring and the O-ring at different temperatures; in addition, the flange plate 2, The materials of flange cover 1 and mandrel 3 are all made of austenitic stainless steel 304 or 316, which has good low temperature resistance. This detection device can be applied to the temperature range of -196 ~ 300 degrees, and the Pressure range, so the sealing performance of the sealing ring can be tested under more working conditions.

In other embodiments, the cavity 21 can also be formed on the flange cover 1 , and the mandrel 3 is matched with the cavity 21 on the flange cover 1 .

In other embodiments, it is also possible to form several cylindrical mandrel protrusions on one end surface of the mandrel 3, and the bottom of the cavity 21 of the flange 2 is correspondingly formed with several cylindrical mandrel protrusions. The mandrel protrusion fits into the flange groove, and a second sealing groove is provided on the side where the mandrel protrusion fits into the flange groove.

The above-mentioned specific implementation is only a detailed explanation of the technical solutions of the present invention, and the present invention is not limited to the above-mentioned embodiments. Those skilled in the art should understand that all improvements and substitutions based on the above-mentioned principles and spirits on the basis of the present invention should be Within the protection scope of the present invention.

Claims (9)

1. A multifunctional sealing ring leak detection device, which includes a flange cover (1) and a flange plate (2) that are sealed and matched with each other, characterized in that: the flange plate (2) and the flange cover A cylindrical cavity (21) is provided between the mating end faces of (1), and a mandrel (3) matching the cavity (21) is arranged inside the cavity (21), and the mandrel ( 3) At least one first sealing groove for placing the sealing ring to be tested is provided on the axial mating surface with the cavity (21); the flange cover (1) is formed with the cavity ( 21) The connected first air intake channel (11) or the first air leakage detection channel (24), and the first air leakage detection channel connected to the cavity (21) is correspondingly formed on the flange (2) channel (24) or the first intake channel (11). 2. A multi-functional sealing ring leak detection device according to claim 1, characterized in that: at least one mandrel protrusion or mandrel recess is formed on one side of the mandrel (3) in the radial direction Groove (33), the radial surface of the flange cover (1) or the flange (2) matched with the radial surface on one side of the mandrel (3) is correspondingly formed with at least A flange groove or flange protrusion (22); the axis of the mandrel protrusion and the flange groove, or the mandrel groove (33) and the flange protrusion (22) At least one second sealing groove for placing the sealing ring to be tested is provided on the mating surface; the flange cover (1) or the flange plate (2) is respectively formed with a second air intake channel (23) and a second air leakage detection channel (24'), wherein the second air intake channel (23) and the second air leakage detection channel (24') communicate with both sides of the second sealing groove respectively. 3. A multifunctional seal ring leak detection device according to claim 2, characterized in that: the cavity (21) is a groove formed on the flange (2), and the mandrel (3) The first seal groove is formed at the joint with the inner wall of the groove, and the mandrel groove is formed on the radial mating surface of the mandrel (3) with the flange (2) (33), the flange plate (2) is formed correspondingly to the flange protrusion (22), and the mating surface of the mandrel groove (33) and the flange protrusion (22) forms the The second sealing groove; the first air intake passage (11) is formed on the flange cover (1) and communicates with the cavity (21), and the second air intake passage (23) is formed on the flange cover (1). on the flange (2) and communicate with the radial mating surface of the mandrel groove (33) and the flange protrusion (22), the first air leakage detection channel (24) and the second Two air leakage detection channels (24') are formed on the flange (2) and communicate with the radial matching surface of the mandrel (3) and the flange (2). 4. A multifunctional seal ring leak detection device according to claim 3, characterized in that: the first air leakage detection channel (24) and the second air leakage detection channel (24') share one channel . 5. A multifunctional sealing ring leak detection device according to claim 3 or 4, characterized in that: the sealing ring to be tested includes an O-ring and a Varise ring; the first sealing groove includes a An O-ring groove (31) at the middle position of the mandrel (3), and an annular notch (31') provided at the edge of one end of the mandrel (3) close to the flange cover (1) , the annular notch (31') is used to place the first pansythen ring (51) to be tested; the second sealing groove includes an O-ring arranged in the middle of the flange protrusion (22) A groove (25), and an annular notch (25') provided at the edge of the flange protrusion (22), the annular notch (25') is used for placing the second Varise ring (52) to be tested. 6. A multi-functional sealing ring leak detection device according to any one of claims 1-5, characterized in that: the end surface of the flange cover (1) that cooperates with the flange plate (2) is set There is an annular protrusion (12), the inner diameter of the annular protrusion (12) is smaller than the diameter of the cavity (21), and the outer diameter of the annular protrusion (12) is greater than the diameter of the cavity (21) ; The flange cover (1) and the flange plate (2) realize sealing cooperation through the sealing gasket (4) sleeved on the annular protrusion (12). 7. A multifunctional seal ring leak detection device according to claim 6, characterized in that a first step (26) is provided at the joint between the flange (2) and the annular protrusion (12) ), the first step (26) is provided with a dust-proof sealing ring (6). 8. A multifunctional sealing ring leak detection device according to any one of claims 1-7, characterized in that: a retaining ring ( 8), one end of the retaining ring (8) abuts against the annular protrusion (12), and the other end abuts against the opening of the first varissen ring (51) to be tested. 9. A multifunctional sealing ring leak detection device according to any one of claims 1-8, characterized in that: the side wall of the flange (2) is provided with a device for moving or fixing the flange rings (7).

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