Flange sealing test fixture

Abstract

The invention relates to a flange sealing detection tool, which comprises an upper cover, a base and a flange. The flange comprises a flange plate and a cylinder. The upper end surface of the flange plate facing away from the cylinder constitutes a plate end sealing surface, and the lower end surface of the cylinder facing away from the flange plate constitutes a cylinder end sealing surface. An upper sealing structure is arranged on the lower side surface of the upper cover. At least two flanges are arranged between the upper cover and the base. Each flange is coaxially arranged in the up-down direction. A seal is formed between the plate end sealing surface of the uppermost flange and the upper cover through the upper sealing structure. A seal is formed between the cylinder end sealing surface of the lowermost flange and the base through the lower sealing structure. In two adjacent flanges, a seal is formed between the cylinder end sealing surface of the upper flange and the disk end sealing surface of the lower flange through an intermediate sealing ring. A connecting rod connects the upper cover and the base together. The flange sealing detection tool can detect at least two or more flange products at one time, thereby improving work efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of sealing detection of structural components, and in particular to a flange sealing detection tool. Background Art

[0002] Flange products are mainly used in GIS and GIB. They are a kind of parts often used in gas-insulated enclosed electrical equipment. Figure 1 As shown, the flange 1 includes a flange 11 and a cylinder 12, both of which are annular structures. The flange 11 and the cylinder 12 are coaxially arranged and are an integrated structure. When the flange product is used, it needs to be sealed and installed on the electrical equipment, wherein the end face of the flange facing away from the cylinder constitutes the disk end sealing surface, and the end face of the cylinder facing away from the flange constitutes the cylinder end sealing surface. Through the disk end sealing surface and the cylinder end sealing surface, the two ends of the flange product form a sealing match with the corresponding adapter to ensure the air tightness of the equipment.

[0003] At present, flange products are usually cast when they are manufactured. After the flange is cast, defects may occur on the sealing surface of the disc end and the sealing surface of the cylinder end. Therefore, it is necessary to perform sealing detection on the sealing surfaces at both ends of the flange product. In the prior art, for the sealing detection of flange workpieces, there is a pipe flange weld air tightness detection device disclosed in the patent document with the authorization announcement number CN110082036B, in which the device body is equivalent to the upper cover, the cover is arranged on the upper end surface of the flange and forms a sealing fit through the sealing ring, and the sealing plug is inserted into the pipe body to seal the pipe body. The inner cavity of the device body and the sealing plug, the flange, the pipe body and the weld form a closed space. The sealing structure between the device body and the flange, and between the sealing plug and the pipe body can ensure the sealing of the closed space. A pipeline interface is provided on the device body, and the pipeline interface is a gas path interface to communicate with the inner cavity of the device body through a gas channel, and the gas pressure in the closed inner cavity is changed through the gas channel. The operator can judge whether the air tightness of the weld meets the standard by detecting whether there is gas flow at the weld or the pressure gauge reading. The device is actually a flange seal detection tool, which is a flange to be tested, fixings for fixing the flange, seals, fluid joints, and detection instruments. These components are assembled together to form a product tooling assembly specifically used for product seal detection.

[0004] However, the above detection device is for testing the air tightness of the weld between the flange and the pipe body, and is not suitable for testing the sealing surfaces at both ends of the flange. Moreover, this detection device can only detect one product at a time, and the working efficiency is low. Summary of the invention

[0005] The purpose of the present invention is to provide a flange sealing detection tool to solve the problem of low efficiency of existing flange sealing detection work.

[0006] The technical solution of the flange seal detection tool of the present invention is:

[0007] The flange sealing detection tool comprises an upper cover and a flange, wherein the flange comprises a flange plate and a cylinder body, wherein the upper end surface of the flange plate facing away from the cylinder body constitutes a disk end sealing surface, and the lower end surface of the cylinder body facing away from the flange plate constitutes a cylinder end sealing surface, an upper sealing structure is arranged on the lower side surface of the upper cover, and the tool further comprises a base, an intermediate sealing ring, and a connecting rod, wherein at least two flanges are arranged between the upper cover and the base, and each flange is coaxially arranged in the up-down direction, and a seal is formed between the disk end sealing surface of the uppermost flange and the upper cover through the upper sealing structure; a lower sealing structure is arranged on the upper side surface of the base, and a seal is formed between the cylinder end sealing surface of the lowermost flange and the base through the lower sealing structure; in two adjacent flanges, a seal is formed between the cylinder end sealing surface of the upper flange and the disk end sealing surface of the lower flange through the intermediate sealing ring; the connecting rod is used to connect the upper cover and the base together, and a connecting hole is provided on the upper cover and / or the base for the connecting rod to pass through, and the end of the connecting rod passing through the connecting hole is connected to a fastener, and the fastener is used to press the upper cover, the base and the flanges together.

[0008] Beneficial effect: the flanges are stacked between the upper cover and the base, and an intermediate sealing ring is arranged between every two adjacent flanges. The upper cover is sealed with the uppermost flange, and the base is sealed with the lowermost flange. After the upper cover, the base and the flanges are pressed together by connecting rods and fasteners, the intermediate sealing ring, the upper sealing structure and the lower sealing structure cooperate to form a seal on the sealing surface to be tested of each flange. The upper cover, the base and the flanges are sealed to form a closed space. Fluid is filled into the closed inner cavity through the pipeline interface on the upper cover for sealing detection. Such flange sealing detection tooling can detect at least two flange products at a time, thereby improving work efficiency.

[0009] Furthermore, the middle sealing ring is a step structure, including a large ring segment and a small ring segment distributed axially, the large ring segment is sealed with the upper end face of the flange, and the small ring segment extends into the inner hole of the flange and contacts with the hole wall surface of the inner hole of the flange.

[0010] Beneficial effect: By setting the middle sealing ring into a step structure, when placing the middle sealing ring, the cooperation between the small diameter section and the inner circumference of the flange can be utilized to position the middle sealing ring, thereby ensuring that the middle sealing ring is installed in place and facilitating operation. Moreover, there is no need to set a limit groove for the middle sealing ring, and the structure is simple.

[0011] Furthermore, a lower sealing groove is provided on the upper side of the base, a lower sealing ring is provided in the lower sealing groove, the lower sealing ring is a flat gasket, the upper and lower sides of the lower sealing ring are both flat, and the lower sealing ring constitutes a lower sealing structure.

[0012] Beneficial effect: the upper and lower side surfaces of the lower sealing ring are planes, so that when the lower sealing ring forms a sealing fit with the lowermost flange, the sealing surface of the cylinder end presses against the plane, which is conducive to reliable sealing of the sealing surface of the cylinder end with a smaller area.

[0013] Furthermore, flange holes are provided on the flange plate, the flange holes of each flange correspond to each other up and down, and the connecting rods are installed on each flange through the flange holes.

[0014] Beneficial effect: The flange holes on the flanges are used to allow the connecting rods to be installed on the flanges. The connecting rods can limit the flanges, which is beneficial to ensure the coaxial placement of the flanges.

[0015] Furthermore, a spacer tube is provided between the flange plates of two adjacent flanges. The spacer tube is sleeved on the connecting rod and is used to limit the distance between the two adjacent flanges.

[0016] Beneficial effect: By setting the spacing tube, when the upper cover, the base and the flanges are connected together by fasteners, the distance between two adjacent flanges is ensured to avoid excessive squeezing of the middle sealing ring.

[0017] The technical solution of the flange seal detection tool of the present invention is:

[0018] The flange sealing detection tooling comprises an upper cover and a flange, wherein the flange comprises a flange plate and a cylinder, wherein the upper end surface of the flange plate facing away from the cylinder constitutes a disk end sealing surface, and the lower end surface of the cylinder facing away from the flange plate constitutes a cylinder end sealing surface, an upper sealing structure is arranged on the lower side surface of the upper cover, and the tooling also comprises a base, an intermediate plate, and a connecting rod, wherein at least two flanges are arranged between the upper cover and the base, and each flange is coaxially arranged in the up-down direction, and a seal is formed between the disk end sealing surface of the uppermost flange and the upper cover through the upper sealing structure; a lower sealing structure is arranged on the upper side surface of the base, and a seal is formed between the cylinder end sealing surface of the lowermost flange and the base through the lower sealing structure; The disk is annular and is arranged between two adjacent flanges. A first sealing structure is arranged on the upper end surface of the middle disk, and a second sealing structure is arranged on the lower end surface. Among the two adjacent flanges, a seal is formed between the cylinder end sealing surface of the upper flange and the middle disk through the first sealing structure, and a seal is formed between the disk end sealing surface of the lower flange and the middle disk through the second sealing structure; the connecting rod is used to connect the upper cover and the base together, and a connecting hole is provided on the upper cover and / or the base for the connecting rod to pass through. The end of the connecting rod passing through the connecting hole is connected to a fastener, and the fastener is used to press the upper cover, the base, each middle disk and each flange together.

[0019] Beneficial effect: each flange is stacked between the upper cover and the base, and an intermediate disk is arranged between every two adjacent flanges, a first sealing structure and a second sealing structure are respectively arranged on the upper and lower sides of the intermediate disk, an upper sealing structure is arranged between the upper cover and the uppermost flange, and a lower sealing structure is arranged between the base and the lowermost flange, so that after the upper cover, the base and the flanges are pressed together by connecting rods and fasteners, the first sealing structure, the second sealing structure, the upper sealing structure and the lower sealing structure cooperate to form a seal on the sealing surface to be tested of each flange, and the upper cover, the base, the intermediate disk and the flanges are sealed to form a closed space, and fluid is filled into the closed inner cavity through the pipeline interface on the upper cover for sealing detection. Such flange sealing detection tooling can detect at least two flange products at a time, thereby improving work efficiency; at the same time, sealing cooperation with the upper and lower flanges is achieved through the upper and lower end surfaces of the intermediate disk, which is conducive to reliable sealing.

[0020] Furthermore, a first sealing groove is provided on the upper end surface of the intermediate disk, a first sealing ring is installed in the first sealing groove, the first sealing ring constitutes a first sealing structure, a second sealing groove is provided on the lower end surface of the intermediate disk, a second sealing ring is installed in the second sealing groove, the second sealing ring constitutes a second sealing structure; a pressure ring is also fixedly connected to the upper end surface of the intermediate disk, the first sealing ring has a radially distributed inner ring part and an outer ring part, the inner ring part is used for sealing cooperation with the cylinder end sealing surface of the flange, and the pressure ring is pressed tightly on the outer ring part.

[0021] Beneficial effect: By fixing the connecting pressure ring on the intermediate disk to compress the first sealing ring and maintain the position of the first sealing ring, it is beneficial for the smaller sealing surface of the cylinder end to press against the first sealing ring to form a reliable seal.

[0022] Furthermore, the upper end surface of the intermediate disk has an annular step surface, which includes an inner annular surface, an outer annular surface, and a positioning peripheral surface. The inner annular surface is lower than the outer annular surface, the positioning peripheral surface is arranged between the inner annular surface and the outer annular surface, and the first sealing groove is arranged on the inner annular surface; the pressure ring is a step structure, including an inner hole, an axially distributed large diameter section and a small diameter section, the large diameter section is used to be fixedly connected to the outer annular surface, the outer peripheral surface of the small diameter section cooperates with the positioning peripheral surface to position the pressure ring, and the lower end surface of the small diameter section has a radially distributed inner part and an outer part, the outer part of the lower end surface of the small diameter section is supported by the inner annular surface of the intermediate disk, and the inner part of the lower end surface of the small diameter section radially extends into the first sealing groove to press on the outer ring part of the first sealing ring, and the hole wall surface of the inner hole of the pressure ring constitutes a guide surface, and the guide surface is used to guide the flange when the flange is placed on the first sealing ring.

[0023] Beneficial effect: By making the upper side surface of the intermediate disk an annular step surface and setting the pressure ring as a step structure, the pressure ring can be positioned and installed on the intermediate disk. By positioning and installing the pressure ring, the inner hole wall of the pressure ring can be used to guide the process of placing the flange on the first sealing ring, thereby ensuring that the sealing surface of the cylinder end is reliably pressed on the first sealing ring.

[0024] Furthermore, the intermediate disk is provided with connecting through holes, the connecting through holes of each intermediate disk correspond to each other up and down, the connecting rod is installed on each intermediate disk through the connecting through holes, and the connecting rod is located radially outside the flange.

[0025] Beneficial effects: The intermediate disks are connected to the upper cover and the base through connecting rods, which improves the stability of the overall structure. At the same time, it is beneficial to place the intermediate disks coaxially, and then to place the flanges in place.

[0026] Furthermore, a spacing tube is provided between two adjacent intermediate disks. The spacing tube is sleeved on the connecting rod and is used to limit the distance between the two adjacent intermediate disks.

[0027] Beneficial effect: By providing the spacing tube, when the upper cover, the base and each intermediate disk are connected together by fasteners, the distance between two adjacent intermediate disks is ensured to avoid excessive squeezing of the first sealing ring and the second sealing ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the structure of the flange;

[0029] Figure 2 This is a schematic diagram of the structure of the flange seal detection tool in Example 1;

[0030] Figure 3 for Figure 2 A cross-sectional view of

[0031] Figure 4 This is a schematic diagram of the structure of the flange seal detection tooling in Example 2;

[0032] Figure 5 for Figure 4 A cross-sectional view of

[0033] Figure 6 for Figure 5 A partial enlarged view of point A in the middle.

[0034] In the figure: 1. flange; 11. flange plate; 12. cylinder; 13. flange hole; 2. upper cover; 21. pipe interface; 3. base; 4. connecting rod; 5. fastening nut; 6. spacer tube; 7. upper sealing ring; 8. lower sealing ring; 9. middle sealing ring; 100. fixing bolt; 22. upper handle; 31. lower handle; 10. middle plate; 101. middle handle; 111. connecting screw; 112. pressure ring; 1121. large diameter section; 1122. small diameter section; 113. first sealing ring; 1131. inner ring part; 1132. outer ring part; 114. second sealing ring. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.

[0037] It should be noted that the terms that may appear in the specific embodiments of the present invention, such as relational terms such as "first" and "second", are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms that may appear, such as "include", "comprise" or any other variants thereof, are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements that are not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the possible statements "including one...", etc., do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0038] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" that may appear should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0039] In the description of the present invention, unless otherwise clearly specified and limited, the term "provided with" that may appear should be understood in a broad sense. For example, the object "provided with" may be a part of the body, or may be arranged separately from the body and connected to the body, and the connection may be a detachable connection or an inseparable connection. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] The present invention is described in further detail below in conjunction with embodiments.

[0041] Embodiment 1 of the flange seal detection tool of the present invention:

[0042] like Figure 1 , Figure 2 , Figure 3 As shown, the flange sealing detection tooling includes an upper cover 2, a base 3 and a plurality of flanges 1 between the upper cover 2 and the base 3. The upper cover 2, the base 3 and the flanges 1 are stacked in the up and down direction and connected together by a connecting rod 4. The upper cover 2, the base 3 and the flanges 1 form a closed inner cavity. A pipeline interface 21 is provided on the upper cover 2 to be connected to a fluid pumping device, so that fluid is filled into the closed inner cavity for sealing detection.

[0043] The flange 1 is divided into two parts along the axial direction, one part is a flange 11, and the other part is a cylinder 12. Both the flange 11 and the cylinder 12 are annular, and the flange 11 and the cylinder 12 are integrally formed and the flange 11 is integrally formed at one end of the cylinder 12. Flange holes 13 are evenly distributed along the circumferential direction on the flange 11. The upper end surface of the flange 11 facing away from the cylinder 12 constitutes a disk end sealing surface, and the lower end surface of the cylinder 12 facing away from the flange 11 constitutes a cylinder end sealing surface. Both the cylinder end sealing surface and the disk end sealing surface are sealing surfaces to be tested.

[0044] The upper cover 2 and the base 3 are both circular plates, and the diameters of the upper cover 2, the base 3 and the flange 11 are consistent. The upper cover 2, the base 3 and the flanges 1 are coaxially arranged. Among the two adjacent flanges 1, the cylinder 12 of the upper flange 1 is supported on the flange 11 of the lower flange 1. An annular upper sealing groove is provided on the lower side of the upper cover 2, and an upper sealing ring 7 is installed in the upper sealing groove. The upper sealing ring 7 constitutes an upper sealing structure, and a seal is formed between the disc end sealing surface of the uppermost flange 1 among the flanges 1 and the upper cover 2 through the upper sealing ring 7. A lower sealing groove is provided on the upper side surface of the base 3, and a lower sealing ring 8 is installed in the lower sealing groove. The lower sealing ring 8 is a flat gasket, and the upper and lower side surfaces of the lower sealing ring 8 are both planes. The lower sealing ring 8 constitutes a lower sealing structure, and a seal is formed between the cylinder end sealing surface of the lowermost flange 1 and the base 3 through the lower sealing ring 8. When the lower sealing ring 8 forms a sealing fit with the lowermost flange 1, the cylinder end sealing surface can be pressed against the wider upper side plane of the lower sealing ring 8, which is conducive to reliable sealing of the cylinder end sealing surface with a smaller area.

[0045] An intermediate sealing ring 9 is provided between two adjacent flanges 1. In the two adjacent flanges 1, a seal is formed between the sealing surface of the barrel end of the upper flange 1 and the sealing surface of the disk end of the lower flange 1 through the intermediate sealing ring 9. The intermediate sealing ring 9 is a step structure, including a large ring segment with a larger outer diameter and a small ring segment with a smaller outer diameter. The intermediate sealing ring 9 overlaps the edge of the upper opening of the inner hole of the flange 11. The large ring segment seals with the sealing surface of the disk end and provides pressure contact with the sealing surface of the barrel end. The small ring segment extends into the inner hole of the flange 11 and contacts the hole wall surface of the inner hole of the flange 11. By setting the intermediate sealing ring 9 as a step structure, when placing the intermediate sealing ring 9, the cooperation between the small diameter segment 1122 and the inner circumference of the flange 11 can be used to position the intermediate sealing ring 9, ensure that the intermediate sealing ring 9 is installed in place, and facilitate operation. In addition, there is no need to set a limit groove for the intermediate sealing ring 9, and the structure is simple. A chamfered structure is provided at the upper hole opening of the inner hole of the flange 11, and the intermediate sealing ring 9 also includes a transition section between the large ring section and the small ring section. The outer peripheral surface of the transition section is an arc surface adapted to the chamfered structure, and the arc surface is adapted to contact with the chamfered part of the hole opening, which is conducive to the close fit between the intermediate sealing ring 9 and the flange 1 to ensure the sealing effect.

[0046] The upper cover 2 and the base 3 are respectively evenly distributed with a plurality of through holes in the circumferential direction, and the number of through holes on the upper cover 2 and the number of through holes on the base 3 are consistent with the number of flange holes 13 on the flange 1 and correspond to each other up and down, wherein a part of the through holes on the upper cover 2 constitutes connecting holes, and another part of the through holes constitutes fixing holes, and of every two adjacent through holes, one is a connecting hole and the other is a fixing hole, a part of the through holes on the base 3 constitutes connecting holes, there are six connecting holes on the upper cover 2, and correspondingly, there are six connecting holes on the base 3, six connecting rods 4 are provided, and the connecting rods 4 are passed through the connecting holes on the upper cover 2, the flange holes 13 of each flange 1, and the connecting holes on the base 3, and the upper end of the connecting rod 4 passing through the upper cover 2 and the lower end passing through the base 3 are both threadedly connected with a fastening nut 5, and the fastening nut 5 constitutes a fastener, and the upper cover 2, the base 3 and each flange 1 are pressed together by screwing the fastening nuts 5 at both ends of the connecting rod 4, and then the upper sealing ring 7, the middle sealing ring 9 and the lower sealing ring 8 are squeezed, and each sealing surface to be tested of the flange 1 is sealed. By installing the connecting rod 4 on each flange 1 , each flange 1 can be limited, which is conducive to ensuring the coaxial placement of each flange 1 .

[0047] The upper cover 2 and the uppermost flange 1 are also connected by fixing bolts 100. The fixing bolts 100 are passed through the fixing holes of the upper cover 2 and the flange holes 13 on the flange 1 that are not equipped with the connecting rods 4. The fixing bolts 100 cooperate with nuts to fix the upper cover 2 and the uppermost flange 1 together, thereby improving the stability of the overall structure.

[0048] A spacer tube 6 is provided between the flange plates 11 of two adjacent flanges 1, and the spacer tube 6 is sleeved on the connecting rod 4. The spacer tube 6 is used to limit the distance between the two adjacent flanges 1. Moreover, a spacer tube 6 is also provided between the lowest flange 1 and the base 3, and the spacer tube 6 is sleeved on the connecting rod 4 to limit the distance between the lowest flange 1 and the base 3. By providing the spacer tube 6, when the upper cover 2, the base 3 and each flange 1 are connected together by fasteners, the distance between the two adjacent flanges 1 and the distance between the lowest flange 1 and the base 3 are ensured to prevent the middle sealing ring 9 and the lower sealing ring 8 from being excessively squeezed by the narrower cylinder end sealing surface.

[0049] When in use, after the upper cover 2, the base 3 and each flange 1 are pressed together by the connecting rod 4 and the fastening nut 5, the middle sealing ring 9, the upper sealing ring 7 and the lower sealing ring 8 cooperate to form a seal on the sealing surface to be tested of each flange 1. The upper cover 2, the base 3 and each flange 1 form a closed space through the sealing cooperation. The closed inner cavity is filled with fluid through the pipeline interface 21 on the upper cover 2 for sealing detection. The pipeline interface 21 is connected to the fluid pumping device through the pipeline. Water is first injected into the closed inner cavity to perform a water pressure test first to observe whether there is water leakage to pre-judge the sealing situation. If there is no water leakage, a subsequent air tightness test is performed, and sulfur hexafluoride gas of a certain pressure is filled into the closed inner cavity. The pressure gauge reading on the pipeline or a sulfur hexafluoride gas detector is set to judge whether the gas is leaking. Such a flange sealing detection tool can detect at least two flange products at a time, which improves work efficiency. It is suitable for water pressure test and gas pressure test below 0.5MPa.

[0050] Embodiment 2 of the flange seal detection tool of the present invention:

[0051] like Figure 1 , Figure 4 , Figure 5 , Figure 6 As shown, the flange sealing detection tooling includes an upper cover 2, a base 3, an intermediate disk 10, and a flange 1. There are multiple flanges 1 and intermediate disks 10. An intermediate disk 10 is provided between each two adjacent flanges 1. The intermediate disk 10 and the flange 1 are located between the upper cover 2 and the base 3. The upper cover 2, each flange 1, each intermediate disk 10, and the base 3 are stacked in the up and down direction and fixed together by a connecting rod 4. The upper cover 2, the base 3, each intermediate disk 10 and each flange 1 form a closed inner cavity. A pipeline interface 21 is provided on the upper cover 2 to be connected to a fluid pumping device, so that fluid is filled into the closed inner cavity for sealing detection.

[0052] The flange 1 is divided into two parts along the axial direction, one part is a flange 11, and the other part is a cylinder 12. Both the flange 11 and the cylinder 12 are annular, and the flange 11 and the cylinder 12 are integrally formed and the flange 11 is integrally formed at one end of the cylinder 12. Flange holes 13 are evenly distributed along the circumferential direction on the flange 11. The upper end surface of the flange 11 facing away from the cylinder 12 constitutes a disk end sealing surface, and the lower end surface of the cylinder 12 facing away from the flange 11 constitutes a cylinder end sealing surface. Both the cylinder end sealing surface and the disk end sealing surface are sealing surfaces to be tested.

[0053] The upper cover 2 and the base 3 both include a circular plate body and a handle arranged on the outer circumferential surface of the circular plate body. The handle on the upper cover 2 is an upper handle 22, and the handle on the base 3 is a lower handle 31. The intermediate disk 10 includes an annular body and an intermediate handle 101 arranged on the outer circumferential surface of the annular body. The annular body of the intermediate disk 10 is a circular plate structure. The outer diameters of the main parts of the upper cover 2, the intermediate disk 10, and the base 3 are consistent, and the outer diameters of the main parts of the upper cover 2, the intermediate disk 10, and the base 3 are larger than the outer diameter of the flange 11. The upper cover 2, the intermediate disk 10, the base 3 and each flange 1 are coaxially arranged. Among the two adjacent flanges 1, the cylinder 12 of the upper flange 1 is supported on the upper end surface of the intermediate disk 10, and the flange 11 of the lower flange 1 supports the upper adjacent intermediate disk 10.

[0054] An annular upper sealing groove is provided on the lower side of the upper cover 2, and an upper sealing ring 7 is installed in the upper sealing groove. The upper sealing ring 7 constitutes an upper sealing structure, and a seal is formed between the disc end sealing surface of the uppermost flange 1 among the flanges 1 and the upper cover 2 through the upper sealing ring 7. A lower sealing groove is provided on the upper side of the base 3, and a lower sealing ring 8 is installed in the lower sealing groove. The lower sealing ring 8 constitutes a lower sealing structure, and a seal is formed between the cylinder end sealing surface of the lowermost flange 1 and the base 3 through the lower sealing ring 8.

[0055] The upper end surface of the intermediate disk 10 has an annular step surface, which includes an inner annular surface, an outer annular surface, and a positioning peripheral surface. The inner annular surface is lower than the outer annular surface, and the positioning peripheral surface is arranged between the inner annular surface and the outer annular surface. The inner annular surface and the outer annular surface constitute two parallel surfaces of the annular step surface, and the positioning peripheral surface constitutes the vertical surface of the annular step surface. That is, the center hole of the intermediate disk 10 is a step hole, which includes a large hole section near the upper hole opening and a small hole section near the lower hole opening. The diameter of the small hole section is smaller than that of the large hole section, and the hole wall surface of the large hole section is the positioning peripheral surface. A first sealing groove is arranged on the inner annular surface, and a first sealing ring 113 is installed in the first sealing groove. The first sealing ring 113 constitutes a first sealing structure. A second sealing groove is provided on the lower end surface of the intermediate disk 10, in which a second sealing ring 114 is installed, and the second sealing ring 114 constitutes a second sealing structure; in the two adjacent flanges 1, a seal is formed between the cylinder end sealing surface of the upper flange 1 and the intermediate disk 10 through the first sealing ring 113, and a seal is formed between the disk end sealing surface of the lower flange 1 and the intermediate disk 10 through the second sealing ring 114.

[0056] A pressure ring 112 is fixedly connected to the upper end surface of the intermediate disk 10. The first sealing ring 113 has a radially distributed inner ring portion 1131 and an outer ring portion 1132. The inner ring portion 1131 and the outer ring portion 1132 are both annular portions. The inner ring portion 1131 is closer to the center hole of the first sealing ring 113 than the outer ring portion 1132. The inner ring portion 1131 is used to seal with the cylinder end sealing surface of the flange 1, and the pressure ring 112 is pressed against the outer ring portion 1132. The pressure ring 112 is a step structure, including an inner hole, an axially distributed large diameter section 1121 and a small diameter section 1122. The outer diameter of the large diameter section 1121 is larger than the outer diameter of the small diameter section 1122. The large diameter section 1121 is provided with a screw through hole. The outer ring surface of the intermediate disk 10 is provided with a threaded hole, so that it is fixedly connected to the outer ring surface of the upper end surface of the intermediate disk 10 by connecting screws 111. The outer peripheral surface of the small diameter section 1122 cooperates with the positioning peripheral surface to position the pressure ring 112. The outer peripheral surface of the small diameter section 1122 is provided with a screw hole. The lower end surface has an inner part and an outer part which are radially distributed, and both the inner part and the outer part are annular parts. The outer part of the lower end surface of the small diameter section 1122 is supported on the inner annular surface of the intermediate disk 10, and the inner part of the lower end surface of the small diameter section 1122 radially extends to the first sealing groove to press against the outer ring part 1132 of the first sealing ring 113. The hole wall surface of the inner hole of the pressure ring 112 constitutes a guide surface, and the guide surface is used to guide the flange 1 when the flange 1 is placed on the first sealing ring 113. The first sealing ring 113 is pressed by the pressure ring 112 to maintain the position of the first sealing ring 113, which is conducive to the formation of a reliable seal after the sealing surface of the barrel end with a smaller area presses against the first sealing ring 113. When installing the pressure ring 112, the positioning circumferential surface can position and install the pressure ring 112, and then the inner hole wall of the pressure ring 112 can be used to guide the process of placing the flange 1 on the first sealing ring 113, ensuring that the cylinder end sealing surface of the adjacent flange 1 above the intermediate disk 10 is reliably pressed on the first sealing ring 113.

[0057] An annular positioning groove is provided on the upper side of the base 3, and the lower sealing groove is provided at the bottom of the positioning groove. The lower sealing ring 8 has a radially distributed inner ring portion 1131 and an outer ring portion 1132. The sealing surface of the barrel end of the lowermost flange 1 is pressed against the inner ring portion 1131 of the lower sealing ring 8. A pressure ring 112 is also fixedly connected to the upper side of the base 3. The outer peripheral surface of the small diameter section 1122 of the pressure ring 112 cooperates with the groove wall surface of the positioning groove to position the pressure ring 112. The outer side of the lower end surface of the small diameter section 1122 of the pressure ring 112 is pressed against the bottom of the positioning groove, and the inner side of the lower end surface of the small diameter section 1122 of the pressure ring 112 is pressed against the outer ring portion 1132 of the lower sealing ring 8. The large diameter section 1121 of the pressure ring 112 is fixedly connected to the upper side of the base 3 by connecting screws 111.

[0058] The upper cover 2 and the main body of the base 3 are respectively provided with a plurality of connection holes evenly distributed in the circumferential direction, and the middle disk 10 is provided with a plurality of connection holes, and the number of connection holes on the upper cover 2 and the number of connection holes on the base 3 are consistent with the number of connection holes on the middle disk 10 and correspond to each other up and down. There are four connection holes on the upper cover 2, and correspondingly, there are four connection holes on the base 3 and four connection holes on the middle disk 10. Four connecting rods 4 are provided, and the connecting rods 4 pass through the connection holes on the upper cover 2, the connection holes of each middle disk 10, and the connection holes on the base 3. The holes are used for installation, and the connecting rod 4 is located on the radial outside of the flange 1 and does not pass through the flange 1. The upper end of the connecting rod 4 passing through the upper cover 2 and the lower end passing through the base 3 are both threadedly connected with fastening nuts 5, and the fastening nuts 5 constitute fasteners. By screwing the fastening nuts 5 at both ends of the connecting rod 4, the upper cover 2, the base 3, each intermediate disk 10 and each flange 1 are pressed together, and then the upper sealing ring 7, the first sealing ring 113, the second sealing ring 114, and the lower sealing ring 8 are squeezed, so as to seal the various sealing surfaces to be tested of the flange 1.

[0059] The upper cover 2 and the uppermost flange 1 are also connected by fixing bolts 100. The circular plate body of the upper cover 2 is evenly distributed with fixing holes along the axial direction. The diameter of the circumference of each fixing hole is smaller than the diameter of the circumference of each connecting hole of the upper cover 2, that is, the fixing hole is closer to the center of the upper cover 2, and the fixing hole and the connecting hole are at different positions in the circumferential direction. The fixing bolts 100 are inserted through the fixing holes of the upper cover 2 and the flange holes 13 on the flange 1. The fixing bolts 100 cooperate with the nuts to fix the upper cover 2 and the uppermost flange 1 together, thereby improving the stability of the overall structure.

[0060] A spacing tube 6 is provided between two adjacent intermediate disks 10, and the spacing tube 6 is sleeved on the connecting rod 4. The spacing tube 6 is used to limit the distance between the two adjacent intermediate disks 10. Moreover, a spacing tube 6 is also provided between the uppermost flange 1 and the upper cover 2, and a spacing tube 6 is also provided between the lowermost flange 1 and the base 3, so as to limit the distance between the uppermost flange 1 and the upper cover 2, and the distance between the lowermost flange 1 and the base 3. By providing the spacing tube 6, when the upper cover 2, the base 3 and each flange 1 are connected together by fasteners, the distance between the two adjacent flanges 1, the distance between the uppermost flange 1 and the upper cover 2, and the distance between the lowermost flange 1 and the base 3 are ensured, so as to prevent the first sealing ring 113 and the lower sealing ring 8 from being excessively squeezed by the narrower cylinder end sealing surface.

[0061] When in use, after the upper cover 2, the base 3 and each flange 1 are pressed together by the connecting rod 4 and the fastening nut 5, the first sealing ring 113, the second sealing ring 114, the upper sealing ring 7 and the lower sealing ring 8 cooperate to form a seal on the sealing surface to be tested of each flange 1. The upper cover 2, the base 3, each intermediate disk 10 and each flange 1 form a closed space through sealing cooperation. The closed inner cavity is filled with fluid through the pipeline interface 21 on the upper cover 2 for sealing detection. The pipeline interface 21 is connected to the fluid pumping device through the pipeline. Sulfur hexafluoride gas of a certain pressure is filled into the closed inner cavity, and the pressure gauge reading on the pipeline or the sulfur hexafluoride gas detector is set up separately to determine whether the gas is leaking. Such a flange sealing detection tool can detect at least two flange products at a time, which improves work efficiency. It can be used for airtight pressure tests greater than 0.5MPa.

[0062] Embodiment 3 of the flange seal detection tool in the present invention:

[0063] The difference between this embodiment and embodiment 1 is that in embodiment 1, the middle sealing ring is a step structure, including a large ring segment and a small ring segment distributed axially, the large ring segment is sealed with the upper end surface of the flange, and the small ring segment extends into the inner hole of the flange and contacts the hole wall of the inner hole of the flange. In this embodiment, the middle sealing ring is a flat gasket, and the middle sealing ring is located above the sealing surface of the disc end.

[0064] Embodiment 4 of the flange seal detection tool in the present invention:

[0065] The difference between this embodiment and embodiment 1 is that in embodiment 1, flange holes are provided on the flange, the flange holes of each flange correspond to each other, and the connecting rod is installed on each flange through the flange hole. In this embodiment, the outer diameter of the upper cover and the base is larger than the outer diameter of the flange, the connecting rod is located radially outside the flange, the connecting rod does not pass through the flange, and the connecting rod connects the upper cover and the base to press the flanges together.

[0066] Embodiment 5 of the flange seal detection tool in the present invention:

[0067] The difference between this embodiment and embodiment 1 is that in embodiment 1, both the upper cover and the base are provided with connection holes for the connection rod to pass through. In this embodiment, the base and the connection rod are welded and fixed, the upper cover is provided with a connection hole for the connection rod to pass through, and the upper end of the connection rod passing through the connection hole is connected with a fastener.

[0068] Embodiment 6 of the flange seal detection tool in the present invention:

[0069] The difference between this embodiment and embodiment 2 is that in embodiment 1, the pressure ring is a step structure, the upper end surface of the intermediate disk has an annular step surface, and the pressure ring is positioned and installed by the annular step surface. In this embodiment, the pressure ring is a flat ring, and its upper and lower side surfaces are both planes, and the upper end surface of the intermediate disk is a plane. The pressure ring is fixed above the upper end surface of the intermediate disk by connecting screws, and the position of the pressure ring is fixed by fixing the connecting screws, thereby guiding the sealing surface of the barrel end of the flange to press against the first sealing ring.

[0070] Embodiment 7 of the flange seal detection tool in the present invention:

[0071] The difference between this embodiment and embodiment 2 is that in embodiment 1, the outer diameters of the main parts of the upper cover, the base, and the middle plate are the same, and the connecting rod is installed on the upper cover, the base, and the middle plate. In this embodiment, the outer diameters of the main parts of the upper cover and the base are the same, and the outer diameter of the main part of the upper cover is larger than the outer diameter of the main part of the middle plate, and the connecting rod is only installed on the upper cover and the base, and is located radially outside the middle plate.

[0072] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions recorded in the aforementioned embodiments without creative work, or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. Flange sealing detection tooling, including an upper cover and a flange, wherein the flange includes a flange plate and a cylinder, wherein the upper end surface of the flange plate facing away from the cylinder forms a disk end sealing surface, and the lower end surface of the cylinder facing away from the flange plate forms a cylinder end sealing surface, and an upper sealing structure is provided on the lower side surface of the upper cover, wherein: It also includes a base, an intermediate sealing ring, and a connecting rod. At least two flanges are installed between the upper cover and the base. The flanges are coaxially arranged in the up and down directions. The upper sealing structure forms a seal between the disk end sealing surface of the uppermost flange and the upper cover; a lower sealing structure is provided on the upper side surface of the base, and the lower sealing structure forms a seal between the cylinder end sealing surface of the lowermost flange and the base; in two adjacent flanges, the cylinder end sealing surface of the upper flange and the disk end sealing surface of the lower flange are sealed by the intermediate sealing ring; the connecting rod is used to connect the upper cover and the base together, and the upper cover and / or the base are provided with connecting holes for the connecting rod to pass through. The end of the connecting rod passing through the connecting hole is connected to a fastener, and the fastener is used to press the upper cover, the base and the flanges together. The intermediate sealing ring is a step structure, including a large ring segment and a small ring segment distributed axially. The large ring segment is sealed with the upper end surface of the flange, and the small ring segment extends into the inner hole of the flange and contacts with the hole wall of the inner hole of the flange.

2. The flange seal detection tooling according to claim 1 is characterized in that: A lower sealing groove is arranged on the upper side of the base, a lower sealing ring is arranged in the lower sealing groove, the lower sealing ring is a flat gasket, the upper and lower sides of the lower sealing ring are both planes, and the lower sealing ring constitutes a lower sealing structure.

3. The flange seal detection tool according to claim 1 or 2, characterized in that: The flange plate is provided with flange holes, the flange holes of each flange correspond to each other up and down, and the connecting rods are installed on each flange through the flange holes.

4. The flange seal detection tool according to claim 3 is characterized in that: A spacer pipe is arranged between the flange plates of two adjacent flanges. The spacer pipe is sleeved on the connecting rod and is used to limit the distance between the two adjacent flanges.

5. Flange sealing detection tooling, including an upper cover and a flange, wherein the flange includes a flange plate and a cylinder, wherein the upper end surface of the flange plate facing away from the cylinder forms a disk end sealing surface, and the lower end surface of the cylinder facing away from the flange plate forms a cylinder end sealing surface, and an upper sealing structure is provided on the lower side surface of the upper cover, wherein: It also includes a base, an intermediate disk, and a connecting rod. At least two flanges are installed between the upper cover and the base. The flanges are coaxially arranged in the up and down directions. The upper sealing structure forms a seal between the disk end sealing surface of the uppermost flange and the upper cover; a lower sealing structure is provided on the upper side surface of the base, and a seal is formed between the cylinder end sealing surface of the lowermost flange and the base; the intermediate disk is annular and is arranged between two adjacent flanges. A first sealing structure is provided on the upper end surface of the intermediate disk, and a second sealing structure is provided on the lower end surface. Of the two adjacent flanges, a seal is formed between the cylinder end sealing surface of the upper flange and the intermediate disk through the first sealing structure, and a seal is formed between the disk end sealing surface of the lower flange and the intermediate disk through the second sealing structure; the connecting rod The rod is used to connect the upper cover and the base together. The upper cover and / or the base are provided with connecting holes for the connecting rod to pass through. The end of the connecting rod passing through the connecting hole is connected to a fastener. The fastener is used to press the upper cover, the base, each intermediate disk and each flange together. The upper end surface of the intermediate disk is provided with a first sealing groove, and a first sealing ring is installed in the first sealing groove. The first sealing ring constitutes a first sealing structure. The lower end surface of the intermediate disk is provided with a second sealing groove, and a second sealing ring is installed in the second sealing groove. The second sealing ring constitutes a second sealing structure; a pressure ring is also fixedly connected to the upper end surface of the intermediate disk, and the first sealing ring has a radially distributed inner ring part and an outer ring part. The inner ring part is used to seal with the cylinder end sealing surface of the flange, and the pressure ring is pressed on the outer ring part.

6. The flange seal detection tool according to claim 5 is characterized in that: The upper end surface of the intermediate disk has an annular step surface, which includes an inner annular surface, an outer annular surface, and a positioning peripheral surface. The inner annular surface is lower than the outer annular surface, the positioning peripheral surface is arranged between the inner annular surface and the outer annular surface, and the first sealing groove is arranged on the inner annular surface; the pressure ring is a step structure, including an inner hole, an axially distributed large diameter section and a small diameter section, the large diameter section is used to be fixedly connected to the outer annular surface, the outer peripheral surface of the small diameter section cooperates with the positioning peripheral surface to position the pressure ring, the lower end surface of the small diameter section has a radially distributed inner part and an outer part, the outer part of the lower end surface of the small diameter section is supported by the inner annular surface of the intermediate disk, the inner part of the lower end surface of the small diameter section radially extends into the first sealing groove to press on the outer ring part of the first sealing ring, and the hole wall surface of the inner hole of the pressure ring constitutes a guiding surface, and the guiding surface is used to guide the flange when the flange is placed on the first sealing ring.

7. The flange seal detection tool according to claim 5 or 6, characterized in that: The intermediate disk is provided with connecting holes, and the connecting holes of each intermediate disk correspond to each other up and down. The connecting rod is installed on each intermediate disk through the connecting holes, and the connecting rod is located on the radial outer side of the flange.

8. The flange seal detection tool according to claim 7 is characterized in that: A spacing tube is arranged between two adjacent middle disks. The spacing tube is sleeved on the connecting rod and is used to limit the distance between the two adjacent middle disks.

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