A sealing ring sealing ability verification device

Abstract

The present invention relates to a sealing ring sealing ability verification device, belonging to the field of airtightness test technology. The device includes a vacuum tank body and a push rod assembly respectively supported at two ends of a base; the vacuum tank body is composed of an inner layer and an outer layer with one end open, the outer layer is installed with an outer flange sealed and fixedly connected to the outer layer, and the inner layer is provided with an inner flange embedded with a test sealing ring; the inner hole of the outer flange is sealed and connected to one end of a sealing bellows, and the other end of the sealing bellows is sealed and connected to a pressure ring, and the inner surface of the pressure ring is matched with the end surface of the inner flange embedded with the test sealing ring; the push rod assembly has a retractable push rod, and one end of the push rod adjacent to the vacuum tank body is connected to a force platform, and the force platform has an annular action end that acts on the inner flange through a pressure ring. After adopting the present invention, after the vacuum interlayer space is evacuated, the sealing performance verification data of the test sealing ring in dynamic docking in a vacuum environment can be conveniently obtained with the help of corresponding testing instruments.

Description

Technical Field

[0001] The invention relates to a sealing ring sealing ability verification device, in particular to a device for verifying the sealing ability of a sealing ring in a dynamic docking form in a vacuum environment, and belongs to the technical field of airtightness testing. Background Art

[0002] The sealing rings installed on various mechanical equipment need to perform sealing functions at a specified temperature, pressure, and in different liquids and gases in a static or moving state. However, the sealing effect of the sealing ring is affected by many factors such as material, hardness, compression, size, shape, and sealing groove shape. For example, one of its typical operating conditions is: in a vacuum environment, a channel connected to the atmosphere needs to be established, and the channel is connected through dynamic docking, and the connection is sealed by pressing the sealing ring.

[0003] According to the applicant's understanding, there is currently no ready-made device that can simply and effectively verify the sealing ability of the sealing ring in dynamic docking in a vacuum environment.

[0004] According to the search, the Chinese patent document with application number 00113598 discloses a method for external pressure sealing test of a bellows expansion joint, in which the gap between the sealing bellows section and the sleeve of the bellows expansion joint is used as the pressure medium cavity, and the pressure of the pressure medium acts radially inward on the sealing bellows section, or the gap formed between the sealing bellows section of the bellows expansion joint and the second sealing bellows section located outside it is used as the pressure medium cavity, and the pressure of the pressure medium acts radially inward on the sealing bellows section. However, the test object is a bellows, and its essence is to verify the sealing performance of the processed bellows under external pressure, which is used to determine the specific location of the weld leakage. The bellows hardly undergoes telescopic displacement during the test, and its sealing ring is always sealed by pressing the flange to a fixed compression amount. In addition, the Chinese patent documents with application numbers 201120029676.5 and 202010806607.4 respectively disclose a mechanical seal test device for a rail pump and a low-pressure seal test module integrated device. These prior art solutions cannot serve as devices for verifying the sealing ability of the sealing ring in dynamic docking in a vacuum environment. Summary of the invention

[0005] The purpose of the present invention is to propose a sealing ability verification device for a sealing ring, so as to conveniently solve the problem of verifying the sealing performance of the sealing ring in dynamic docking in a vacuum environment.

[0006] To achieve the above-mentioned purpose, the basic technical scheme of the sealing ring sealing ability verification device of the present invention is as follows: comprising a vacuum tank body and a push rod assembly respectively supported at two ends of a base;

[0007] The vacuum tank body is composed of an inner layer and an outer layer with one end open, the outer layer opening is installed with an outer flange sealed and fixedly connected thereto, and the inner layer opening has an inner flange with a test sealing ring embedded therein; the inner hole of the outer flange is sealedly connected to one end of a sealing bellows, the other end of the sealing bellows is sealedly connected to a pressure ring, and the inner surface of the pressure ring is matched with the end surface of the inner flange with the test sealing ring embedded therein;

[0008] The push rod assembly comprises a retractable push rod, one end of the push rod adjacent to the vacuum tank body is connected with a force application platform, and the force application platform comprises an annular action end which acts on the inner flange through a pressure ring.

[0009] During the test, the inner surface of the pressure ring connected to the sealing bellows through the test sealing ring of the inner flange of the inner layer of the vacuum tank forms a sealing pair. When the push rod of the push rod assembly is pushed forward, the force is evenly applied through the force application platform to make the surface of the pressure ring close to the inner flange, so that the test sealing ring is elastically deformed to form a seal on the active surface. In this process, the sealing bellows can compensate for the displacement caused by the pressure by its own expansion and contraction, ensuring that a vacuum interlayer space is always formed between the inner and outer layers of the vacuum tank, and a channel connected to the atmosphere is constructed within the inner layer.

[0010] In this way, after the vacuum interlayer space is evacuated, the sealing performance verification data of the test sealing ring in the dynamic docking in the vacuum environment can be conveniently obtained with the help of corresponding testing instruments.

[0011] The present invention is further improved by:

[0012] The outer diameter of the annular action end is adapted to the inner diameter of the sealing bellows, so that it can simultaneously play an internal supporting and positioning role for the sealing bellows.

[0013] The inner end of the pressure ring has a concave inner surface. The end of the push rod adjacent to the vacuum tank body extends into the positioning convex ring in the middle of the force application platform and connects with it. In this way, the push rod and the pressure ring can be securely positioned and reliably positioned.

[0014] The outer surface of the pressure ring has a positioning ring groove adapted to the annular action end of the force application platform, and the force application platform applies pressure to the inner flange of the inner layer through the annular action end embedded in the positioning ring groove of the pressure ring, so as to ensure that the pressing force on the sealing ring is uniform and stable.

[0015] The opening of the outer layer has a flange ring, and an outer flange plate is installed and sealed and fixed to the flange ring through fasteners. The inner hole of the outer flange plate is welded and sealed to one end of a sealing bellows inserted therein. The other end of the sealing bellows is sleeved outside the pressure ring and sealed and welded to the pressure ring. These structures avoid other possible leakage links.

[0016] The pressure ring is equipped with a noise sensor through a bridge frame, and the base is equipped with a vacuum pipeline passing through an electric control valve and a pressure sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0018] Figure 1 It is a structural diagram of embodiment 1 of the present invention.

[0019] Figure 2 yes Figure 1 Top view of the .

[0020] Figure 3 yes Figure 1 Schematic diagram of the three-dimensional exploded structure of an embodiment.

[0021] Figure 4 yes Figure 1 A schematic diagram of the partially enlarged structure of the bellows portion in the embodiment. DETAILED DESCRIPTION

[0022] Embodiment 1

[0023] The sealing ring sealing ability verification device implemented in this embodiment is as follows Figures 1 to 4 As shown, the two ends of the base 4 support the vacuum tank body 1 and the push rod assembly 3 respectively. The vacuum tank body 1 is composed of an inner layer 1-1 with an open end and an outer layer 1-2. The open end of the outer layer 1-2 has a flange ring 1.1, and an outer flange plate 1.2 is installed and sealed and fixed to it by fasteners. The open end of the inner layer 1-1 through the bottleneck has an inner flange 6, and the outer end surface of the inner flange 6 has a groove for embedding a test sealing ring 7.

[0024] The inner hole of the outer flange 1.2 is welded and sealed to one end of the sealing bellows 2 inserted therein, and the other end of the sealing bellows 2 is sleeved outside the pressure ring 13 and sealed and welded thereto. The inner end of the pressure ring 13 has a concave inner surface, which is matched with the end surface of the test seal ring 7 embedded in the inner flange 6.

[0025] The push rod assembly 3 is mainly composed of an electric cylinder 3-1 and a push rod 3-2 at its telescopic end, and a force sensor 9 and a displacement sensor 10 are installed at corresponding positions. One end of the push rod 3-2 adjacent to the vacuum tank body 1 extends into the positioning convex ring 5.1 in the middle of the force-applying platform 5 and connects with it. The outer surface of the pressure ring 13 has a positioning ring groove adapted to the annular action end of the force-applying platform 5. The force-applying platform 5 securely applies pressure to the inner flange 6 of the inner layer through the annular action end 5.2 embedded in the positioning ring groove of the pressure ring 13. The outer diameter of the annular action end 5.2 is adapted to the inner diameter of the sealing bellows 2.

[0026] In addition, the pressure ring 13 is equipped with a noise sensor 8 through a bridge frame, and the base 4 is also equipped with a vacuum pipeline passing through an electric control valve 12 and a pressure sensor 11. Figure 3 14 is an O-ring seal between the tank body and the flange ring and the flange plate.

[0027] During the test, the push rod assembly 3 fixed on one side of the base 4 extends out under the drive of the electric cylinder, and the pressing force is evenly applied to the pressure surface of the inner end of the sealing bellows 2 through the force application platform 5, and the test sealing ring 7 embedded in the flange 6 of the vacuum tank body 1 produces elastic deformation to form a seal on the active surface. The test sealing ring 7 reaches the preset deformation amount under the detection of the displacement sensor 10, and the interlayer space of the vacuum tank body 1 begins to be evacuated at the same time. When the preset vacuum degree is reached, the pressure is maintained, and the leakage rate of the test sealing ring 7 under the vacuum degree is monitored in real time by the pressure sensor 11; the leakage noise value is monitored by the noise sensor 8; and the pressure value of the sealing ring is monitored by the force sensor 9. In this process, the sealing bellows realizes displacement compensation in the telescopic movement under the premise of ensuring sealing, so as to achieve the purpose of building a channel connecting with the atmosphere in an environment separated by vacuum. Finally, the sealing performance of the test sealing ring is quantitatively analyzed and evaluated in multiple dimensions such as the leakage rate, compression, pressure bearing value and leakage noise value. Generally, the lower the leakage rate and the lower the leakage noise value, the better the sealing ability. By continuously determining the various parameters of the sealing ring through multiple sets of dynamic tests, reliable test data can be provided for the selection of sealing rings for specific usage scenarios. The simultaneously recorded compression values ​​and pressure values ​​can provide important data references for structural design in engineering practice.

[0028] Experiments show that this embodiment has the following beneficial effects:

[0029] 1. It can not only meet the needs of verifying the sealing ability of the sealing ring in the dynamic docking form in a vacuum environment in various situations, but also has a simple structure, high efficiency, low cost and more energy saving.

[0030] 2. The test device can verify the sealing ability of the sealing ring under a specific pressure through a force sensor. Therefore, it is suitable for situations where the pressure bearing value of the pressure-bearing structure of the sealing ring is limited. That is, it can verify the sealing selection under special circumstances, such as the connection device with strict limit on the sealing compression force.

[0031] 3. It is convenient to equip various intelligent sensing facilities to complete the collection, transmission, storage, analysis, display and automatic control of various operating data during the test through the Internet of Things architecture. At the same time, it can extract sensitive information features to provide quantitative and intuitive evaluation standards for the verification of the sealing ability of the sealing ring. With the continuous improvement of the data model, a more scientific evaluation system will be formed.

[0032] 4. Metal bellows expansion joints are used as sealing bellows, which have good sealing performance under vacuum conditions, high reliability and long service life.

[0033] 5. The vacuum tank interlayer space has a small vacuum volume, which improves the test efficiency.

[0034] The above embodiments do not limit the scope of the invention, and equivalent changes made according to the concept of the invention still belong to the protection scope of the invention. For example, the sealing bellows, the force application platform and the push rod assembly are all detachable; the base can be arranged either horizontally or vertically; the flange can be replaced with other shapes according to different test requirements.

Claims

1. A sealing ring sealing ability verification device, comprising a vacuum tank body (1) and a push rod assembly (3) respectively supported at two ends of a base (4); The vacuum tank body is composed of an inner layer and an outer layer with one end open, the outer layer opening is provided with an outer flange sealed and fixed thereto, and the inner layer opening has an inner flange embedded with a test sealing ring (7); the inner hole of the outer flange is sealed and connected to one end of a sealing bellows, the other end of the sealing bellows is sealed and connected to a pressure ring, and the inner surface of the pressure ring is matched with the end surface of the inner flange embedded with the test sealing ring; A vacuum interlayer space is formed between the inner layer and the outer layer of the vacuum tank body, and a channel connected to the atmosphere is constructed within the inner layer of the vacuum tank body; The push rod assembly comprises a retractable push rod, one end of the push rod adjacent to the vacuum tank body is connected to a force application platform (5), and the force application platform comprises an annular action end which acts on the inner flange through a pressure ring.

2. The sealing ring sealing ability verification device according to claim 1 is characterized in that: The outer diameter of the annular active end is adapted to the inner diameter of the sealing bellows.

3. The sealing ring sealing ability verification device according to claim 1 or 2, characterized in that: The inner end of the pressure ring has a concave inner surface.

4. The sealing ring sealing ability verification device according to claim 3 is characterized in that: One end of the push rod adjacent to the vacuum tank body extends into the positioning convex ring in the middle of the force application platform and is connected with it.

5. The sealing ring sealing ability verification device according to claim 4 is characterized in that: The outer surface of the pressure ring has a positioning ring groove adapted to the annular action end of the force-applying platform, and the force-applying platform applies pressure to the inner flange of the inner layer through the annular action end embedded in the positioning ring groove of the pressure ring.

6. The sealing ring sealing ability verification device according to claim 5 is characterized in that: The opening of the outer layer is provided with a flange ring, and an outer flange plate which is sealed and fixedly connected with the flange ring is installed by fasteners.

7. The sealing ring sealing ability verification device according to claim 6, characterized in that: The inner hole of the outer flange is welded and sealed to one end of a sealing bellows inserted therein.

8. The sealing ring sealing ability verification device according to claim 7 is characterized in that: The other end of the sealing bellows is sleeved outside the pressure ring and is sealed and welded to the pressure ring.

9. The sealing ring sealing ability verification device according to claim 8, characterized in that: The pressure ring is equipped with a noise sensor through a bridge frame, and the base is equipped with a vacuum pipeline passing through an electric control valve and a pressure sensor.

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